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 jlong cooked_allocated_bytes() {
440 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
441 if (UseTLAB) {
442 size_t used_bytes = tlab().used_bytes();
443 if ((ssize_t)used_bytes > 0) {
444 // More-or-less valid tlab. The load_acquire above should ensure
445 // that the result of the add is <= the instantaneous value
446 return allocated_bytes + used_bytes;
447 }
448 }
449 return allocated_bytes;
450 }
451
452 TRACE_DATA* trace_data() { return &_trace_data; }
453
454 // VM operation support
455 int vm_operation_ticket() { return ++_vm_operation_started_count; }
456 int vm_operation_completed_count() { return _vm_operation_completed_count; }
457 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
458
459 // For tracking the heavyweight monitor the thread is pending on.
460 ObjectMonitor* current_pending_monitor() {
461 return _current_pending_monitor;
462 }
463 void set_current_pending_monitor(ObjectMonitor* monitor) {
464 _current_pending_monitor = monitor;
465 }
466 void set_current_pending_monitor_is_from_java(bool from_java) {
467 _current_pending_monitor_is_from_java = from_java;
468 }
469 bool current_pending_monitor_is_from_java() {
470 return _current_pending_monitor_is_from_java;
471 }
472
473 // For tracking the ObjectMonitor on which this thread called Object.wait()
474 ObjectMonitor* current_waiting_monitor() {
475 return _current_waiting_monitor;
476 }
477 void set_current_waiting_monitor(ObjectMonitor* monitor) {
478 _current_waiting_monitor = monitor;
479 }
480
481 // GC support
482 // Apply "f->do_oop" to all root oops in "this".
483 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
484 // Used by JavaThread::oops_do.
485 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
486 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
487
488 // Handles the parallel case for the method below.
489 private:
490 bool claim_oops_do_par_case(int collection_parity);
491 public:
492 // Requires that "collection_parity" is that of the current strong roots
493 // iteration. If "is_par" is false, sets the parity of "this" to
494 // "collection_parity", and returns "true". If "is_par" is true,
495 // uses an atomic instruction to set the current threads parity to
496 // "collection_parity", if it is not already. Returns "true" iff the
497 // calling thread does the update, this indicates that the calling thread
498 // has claimed the thread's stack as a root groop in the current
499 // collection.
500 bool claim_oops_do(bool is_par, int collection_parity) {
501 if (!is_par) {
502 _oops_do_parity = collection_parity;
503 return true;
504 } else {
505 return claim_oops_do_par_case(collection_parity);
506 }
507 }
508
509 // Sweeper support
510 void nmethods_do(CodeBlobClosure* cf);
511
512 // jvmtiRedefineClasses support
513 void metadata_do(void f(Metadata*));
514
515 // Used by fast lock support
516 virtual bool is_lock_owned(address adr) const;
517
518 // Check if address is in the stack of the thread (not just for locks).
519 // Warning: the method can only be used on the running thread
520 bool is_in_stack(address adr) const;
521 // Check if address is in the usable part of the stack (excludes protected
522 // guard pages)
523 bool is_in_usable_stack(address adr) const;
524
525 // Sets this thread as starting thread. Returns failure if thread
526 // creation fails due to lack of memory, too many threads etc.
527 bool set_as_starting_thread();
528
529 protected:
530 // OS data associated with the thread
531 OSThread* _osthread; // Platform-specific thread information
532
533 // Thread local resource area for temporary allocation within the VM
534 ResourceArea* _resource_area;
535
536 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
537
538 // Thread local handle area for allocation of handles within the VM
539 HandleArea* _handle_area;
540 GrowableArray<Metadata*>* _metadata_handles;
541
542 // Support for stack overflow handling, get_thread, etc.
543 address _stack_base;
544 size_t _stack_size;
545 uintptr_t _self_raw_id; // used by get_thread (mutable)
546 int _lgrp_id;
547
548 public:
549 // Stack overflow support
550 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
551
552 void set_stack_base(address base) { _stack_base = base; }
553 size_t stack_size() const { return _stack_size; }
554 void set_stack_size(size_t size) { _stack_size = size; }
555 void record_stack_base_and_size();
556
557 bool on_local_stack(address adr) const {
558 /* QQQ this has knowledge of direction, ought to be a stack method */
559 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
560 }
561
562 uintptr_t self_raw_id() { return _self_raw_id; }
563 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
564
565 int lgrp_id() const { return _lgrp_id; }
566 void set_lgrp_id(int value) { _lgrp_id = value; }
567
568 // Printing
569 void print_on(outputStream* st) const;
570 void print() const { print_on(tty); }
571 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
572
573 // Debug-only code
574 #ifdef ASSERT
575 private:
576 // Deadlock detection support for Mutex locks. List of locks own by thread.
577 Monitor* _owned_locks;
578 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
579 // thus the friendship
580 friend class Mutex;
581 friend class Monitor;
582
583 public:
584 void print_owned_locks_on(outputStream* st) const;
585 void print_owned_locks() const { print_owned_locks_on(tty); }
586 Monitor* owned_locks() const { return _owned_locks; }
587 bool owns_locks() const { return owned_locks() != NULL; }
588 bool owns_locks_but_compiled_lock() const;
589
590 // Deadlock detection
591 bool allow_allocation() { return _allow_allocation_count == 0; }
592 ResourceMark* current_resource_mark() { return _current_resource_mark; }
593 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
594 #endif
595
596 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
597
598 private:
599 volatile int _jvmti_env_iteration_count;
600
601 public:
602 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
603 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
604 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
605
606 // Code generation
607 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
608 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
609 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
610
611 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
612 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
613
614 #define TLAB_FIELD_OFFSET(name) \
615 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
616
617 TLAB_FIELD_OFFSET(start)
618 TLAB_FIELD_OFFSET(end)
619 TLAB_FIELD_OFFSET(top)
620 TLAB_FIELD_OFFSET(pf_top)
621 TLAB_FIELD_OFFSET(size) // desired_size
622 TLAB_FIELD_OFFSET(refill_waste_limit)
623 TLAB_FIELD_OFFSET(number_of_refills)
624 TLAB_FIELD_OFFSET(fast_refill_waste)
625 TLAB_FIELD_OFFSET(slow_allocations)
626
627 #undef TLAB_FIELD_OFFSET
628
629 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
630
631 public:
632 volatile intptr_t _Stalled ;
633 volatile int _TypeTag ;
634 ParkEvent * _ParkEvent ; // for synchronized()
635 ParkEvent * _SleepEvent ; // for Thread.sleep
636 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
637 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
638 int NativeSyncRecursion ; // diagnostic
639
640 volatile int _OnTrap ; // Resume-at IP delta
641 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
642 jint _hashStateX ; // thread-specific hashCode generator state
643 jint _hashStateY ;
644 jint _hashStateZ ;
645 void * _schedctl ;
646
647
648 volatile jint rng [4] ; // RNG for spin loop
649
650 // Low-level leaf-lock primitives used to implement synchronization
651 // and native monitor-mutex infrastructure.
652 // Not for general synchronization use.
653 static void SpinAcquire (volatile int * Lock, const char * Name) ;
654 static void SpinRelease (volatile int * Lock) ;
655 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
656 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
657 static void muxRelease (volatile intptr_t * Lock) ;
658 };
659
660 // Inline implementation of Thread::current()
661 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
662 // startup.
663 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
664 // period. This is inlined in thread_<os_family>.inline.hpp.
665
666 inline Thread* Thread::current() {
667 #ifdef ASSERT
668 // This function is very high traffic. Define PARANOID to enable expensive
669 // asserts.
670 #ifdef PARANOID
671 // Signal handler should call ThreadLocalStorage::get_thread_slow()
672 Thread* t = ThreadLocalStorage::get_thread_slow();
673 assert(t != NULL && !t->is_inside_signal_handler(),
674 "Don't use Thread::current() inside signal handler");
675 #endif
676 #endif
677 Thread* thread = ThreadLocalStorage::thread();
678 assert(thread != NULL, "just checking");
679 return thread;
680 }
681
682 // Name support for threads. non-JavaThread subclasses with multiple
683 // uniquely named instances should derive from this.
684 class NamedThread: public Thread {
685 friend class VMStructs;
686 enum {
687 max_name_len = 64
688 };
689 private:
690 char* _name;
691 // log JavaThread being processed by oops_do
692 JavaThread* _processed_thread;
693
694 public:
695 NamedThread();
696 ~NamedThread();
697 // May only be called once per thread.
698 void set_name(const char* format, ...);
699 virtual bool is_Named_thread() const { return true; }
700 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
701 JavaThread *processed_thread() { return _processed_thread; }
702 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
703 };
704
705 // Worker threads are named and have an id of an assigned work.
706 class WorkerThread: public NamedThread {
707 private:
708 uint _id;
709 public:
710 WorkerThread() : _id(0) { }
711 virtual bool is_Worker_thread() const { return true; }
712
713 virtual WorkerThread* as_Worker_thread() const {
714 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
715 return (WorkerThread*) this;
716 }
717
718 void set_id(uint work_id) { _id = work_id; }
719 uint id() const { return _id; }
720 };
721
722 // A single WatcherThread is used for simulating timer interrupts.
723 class WatcherThread: public Thread {
724 friend class VMStructs;
725 public:
726 virtual void run();
727
728 private:
729 static WatcherThread* _watcher_thread;
730
731 static bool _startable;
732 volatile static bool _should_terminate; // updated without holding lock
733
734 os::WatcherThreadCrashProtection* _crash_protection;
735 public:
736 enum SomeConstants {
737 delay_interval = 10 // interrupt delay in milliseconds
738 };
739
740 // Constructor
741 WatcherThread();
742
743 // Tester
744 bool is_Watcher_thread() const { return true; }
745
746 // Printing
747 char* name() const { return (char*)"VM Periodic Task Thread"; }
748 void print_on(outputStream* st) const;
749 void print() const { print_on(tty); }
750 void unpark();
751
752 // Returns the single instance of WatcherThread
753 static WatcherThread* watcher_thread() { return _watcher_thread; }
754
755 // Create and start the single instance of WatcherThread, or stop it on shutdown
756 static void start();
757 static void stop();
758 // Only allow start once the VM is sufficiently initialized
759 // Otherwise the first task to enroll will trigger the start
760 static void make_startable();
761
762 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
763 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
764 _crash_protection = crash_protection;
765 }
766
767 bool has_crash_protection() const { return _crash_protection != NULL; }
768 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
769
770 private:
771 int sleep() const;
772 };
773
774
775 class CompilerThread;
776
777 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
778
779 class JavaThread: public Thread {
780 friend class VMStructs;
781 private:
782 JavaThread* _next; // The next thread in the Threads list
783 oop _threadObj; // The Java level thread object
784
785 #ifdef ASSERT
786 private:
787 int _java_call_counter;
788
789 public:
790 int java_call_counter() { return _java_call_counter; }
791 void inc_java_call_counter() { _java_call_counter++; }
792 void dec_java_call_counter() {
793 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
794 _java_call_counter--;
795 }
796 private: // restore original namespace restriction
797 #endif // ifdef ASSERT
798
799 #ifndef PRODUCT
800 public:
801 enum {
802 jump_ring_buffer_size = 16
803 };
804 private: // restore original namespace restriction
805 #endif
806
807 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
808
809 ThreadFunction _entry_point;
810
811 JNIEnv _jni_environment;
812
813 // Deopt support
814 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
815
816 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
817 // transition out of native
818 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
819 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
820 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
821 // Because deoptimization is lazy we must save jvmti requests to set locals
822 // in compiled frames until we deoptimize and we have an interpreter frame.
823 // This holds the pointer to array (yeah like there might be more than one) of
824 // description of compiled vframes that have locals that need to be updated.
825 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
826
827 // Handshake value for fixing 6243940. We need a place for the i2c
828 // adapter to store the callee Method*. This value is NEVER live
829 // across a gc point so it does NOT have to be gc'd
830 // The handshake is open ended since we can't be certain that it will
831 // be NULLed. This is because we rarely ever see the race and end up
832 // in handle_wrong_method which is the backend of the handshake. See
833 // code in i2c adapters and handle_wrong_method.
834
835 Method* _callee_target;
836
837 // Used to pass back results to the interpreter or generated code running Java code.
838 oop _vm_result; // oop result is GC-preserved
839 Metadata* _vm_result_2; // non-oop result
840
841 // See ReduceInitialCardMarks: this holds the precise space interval of
842 // the most recent slow path allocation for which compiled code has
843 // elided card-marks for performance along the fast-path.
844 MemRegion _deferred_card_mark;
845
846 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
847 // allocated during deoptimization
848 // and by JNI_MonitorEnter/Exit
849
850 // Async. requests support
851 enum AsyncRequests {
852 _no_async_condition = 0,
853 _async_exception,
854 _async_unsafe_access_error
855 };
856 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
857 oop _pending_async_exception;
858
859 // Safepoint support
860 public: // Expose _thread_state for SafeFetchInt()
861 volatile JavaThreadState _thread_state;
862 private:
863 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
864 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
865
866 // JavaThread termination support
867 enum TerminatedTypes {
868 _not_terminated = 0xDEAD - 2,
869 _thread_exiting, // JavaThread::exit() has been called for this thread
870 _thread_terminated, // JavaThread is removed from thread list
871 _vm_exited // JavaThread is still executing native code, but VM is terminated
872 // only VM_Exit can set _vm_exited
873 };
874
875 // In general a JavaThread's _terminated field transitions as follows:
876 //
877 // _not_terminated => _thread_exiting => _thread_terminated
878 //
879 // _vm_exited is a special value to cover the case of a JavaThread
880 // executing native code after the VM itself is terminated.
881 volatile TerminatedTypes _terminated;
882 // suspend/resume support
883 volatile bool _suspend_equivalent; // Suspend equivalent condition
884 jint _in_deopt_handler; // count of deoptimization
885 // handlers thread is in
886 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
887 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
888 // never locked) when throwing an exception. Used by interpreter only.
889
890 // JNI attach states:
891 enum JNIAttachStates {
892 _not_attaching_via_jni = 1, // thread is not attaching via JNI
893 _attaching_via_jni, // thread is attaching via JNI
894 _attached_via_jni // thread has attached via JNI
895 };
896
897 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
898 // A native thread that is attaching via JNI starts with a value
899 // of _attaching_via_jni and transitions to _attached_via_jni.
900 volatile JNIAttachStates _jni_attach_state;
901
902 public:
903 // State of the stack guard pages for this thread.
904 enum StackGuardState {
905 stack_guard_unused, // not needed
906 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
907 stack_guard_enabled // enabled
908 };
909
910 private:
911
912 StackGuardState _stack_guard_state;
913
914 // Precompute the limit of the stack as used in stack overflow checks.
915 // We load it from here to simplify the stack overflow check in assembly.
916 address _stack_overflow_limit;
917
918 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
919 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
920 // code)
921 volatile oop _exception_oop; // Exception thrown in compiled code
922 volatile address _exception_pc; // PC where exception happened
923 volatile address _exception_handler_pc; // PC for handler of exception
924 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
925
926 // support for JNI critical regions
927 jint _jni_active_critical; // count of entries into JNI critical region
928
929 // For deadlock detection.
930 int _depth_first_number;
931
932 // JVMTI PopFrame support
933 // This is set to popframe_pending to signal that top Java frame should be popped immediately
934 int _popframe_condition;
935
936 #ifndef PRODUCT
937 int _jmp_ring_index;
938 struct {
939 // We use intptr_t instead of address so debugger doesn't try and display strings
940 intptr_t _target;
941 intptr_t _instruction;
942 const char* _file;
943 int _line;
944 } _jmp_ring[ jump_ring_buffer_size ];
945 #endif /* PRODUCT */
946
947 #if INCLUDE_ALL_GCS
948 // Support for G1 barriers
949
950 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
951 // Set of all such queues.
952 static SATBMarkQueueSet _satb_mark_queue_set;
953
954 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
955 // Set of all such queues.
956 static DirtyCardQueueSet _dirty_card_queue_set;
957
958 void flush_barrier_queues();
959 #endif // INCLUDE_ALL_GCS
960
961 friend class VMThread;
962 friend class ThreadWaitTransition;
963 friend class VM_Exit;
964
965 void initialize(); // Initialized the instance variables
966
967 public:
968 // Constructor
969 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
970 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
971 ~JavaThread();
972
973 #ifdef ASSERT
974 // verify this JavaThread hasn't be published in the Threads::list yet
975 void verify_not_published();
976 #endif
977
978 //JNI functiontable getter/setter for JVMTI jni function table interception API.
979 void set_jni_functions(struct JNINativeInterface_* functionTable) {
980 _jni_environment.functions = functionTable;
981 }
982 struct JNINativeInterface_* get_jni_functions() {
983 return (struct JNINativeInterface_ *)_jni_environment.functions;
984 }
985
986 // This function is called at thread creation to allow
987 // platform specific thread variables to be initialized.
988 void cache_global_variables();
989
990 // Executes Shutdown.shutdown()
991 void invoke_shutdown_hooks();
992
993 // Cleanup on thread exit
994 enum ExitType {
995 normal_exit,
996 jni_detach
997 };
998 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
999
1000 void cleanup_failed_attach_current_thread();
1001
1002 // Testers
1003 virtual bool is_Java_thread() const { return true; }
1004
1005 // Thread chain operations
1006 JavaThread* next() const { return _next; }
1007 void set_next(JavaThread* p) { _next = p; }
1008
1009 // Thread oop. threadObj() can be NULL for initial JavaThread
1010 // (or for threads attached via JNI)
1011 oop threadObj() const { return _threadObj; }
1012 void set_threadObj(oop p) { _threadObj = p; }
1013
1014 ThreadPriority java_priority() const; // Read from threadObj()
1015
1016 // Prepare thread and add to priority queue. If a priority is
1017 // not specified, use the priority of the thread object. Threads_lock
1018 // must be held while this function is called.
1019 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1020
1021 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1022 address saved_exception_pc() { return _saved_exception_pc; }
1023
1024
1025 ThreadFunction entry_point() const { return _entry_point; }
1026
1027 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1028 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1029
1030 // Last frame anchor routines
1031
1032 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1033
1034 // last_Java_sp
1035 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1036 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1037
1038 // last_Java_pc
1039
1040 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1041
1042 // Safepoint support
1043 #ifndef PPC64
1044 JavaThreadState thread_state() const { return _thread_state; }
1045 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1046 #else
1047 // Use membars when accessing volatile _thread_state. See
1048 // Threads::create_vm() for size checks.
1049 JavaThreadState thread_state() const {
1050 return (JavaThreadState) OrderAccess::load_acquire((volatile jint*)&_thread_state);
1051 }
1052 void set_thread_state(JavaThreadState s) {
1053 OrderAccess::release_store((volatile jint*)&_thread_state, (jint)s);
1054 }
1055 #endif
1056 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1057 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1058 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1059
1060 // thread has called JavaThread::exit() or is terminated
1061 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1062 // thread is terminated (no longer on the threads list); we compare
1063 // against the two non-terminated values so that a freed JavaThread
1064 // will also be considered terminated.
1065 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1066 void set_terminated(TerminatedTypes t) { _terminated = t; }
1067 // special for Threads::remove() which is static:
1068 void set_terminated_value() { _terminated = _thread_terminated; }
1069 void block_if_vm_exited();
1070
1071 bool doing_unsafe_access() { return _doing_unsafe_access; }
1072 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1073
1074 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1075 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1076
1077 #if INCLUDE_NMT
1078 // native memory tracking
1079 inline MemRecorder* get_recorder() const { return (MemRecorder*)_recorder; }
1080 inline void set_recorder(MemRecorder* rc) { _recorder = rc; }
1081
1082 private:
1083 // per-thread memory recorder
1084 MemRecorder* volatile _recorder;
1085 #endif // INCLUDE_NMT
1086
1087 // Suspend/resume support for JavaThread
1088 private:
1089 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1090 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1091
1092 public:
1093 void java_suspend();
1094 void java_resume();
1095 int java_suspend_self();
1096
1097 void check_and_wait_while_suspended() {
1098 assert(JavaThread::current() == this, "sanity check");
1099
1100 bool do_self_suspend;
1101 do {
1102 // were we externally suspended while we were waiting?
1103 do_self_suspend = handle_special_suspend_equivalent_condition();
1104 if (do_self_suspend) {
1105 // don't surprise the thread that suspended us by returning
1106 java_suspend_self();
1107 set_suspend_equivalent();
1108 }
1109 } while (do_self_suspend);
1110 }
1111 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1112 // Check for async exception in addition to safepoint and suspend request.
1113 static void check_special_condition_for_native_trans(JavaThread *thread);
1114
1115 // Same as check_special_condition_for_native_trans but finishes the
1116 // transition into thread_in_Java mode so that it can potentially
1117 // block.
1118 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1119
1120 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1121 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1122 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1123 // Warning: is_ext_suspend_completed() may temporarily drop the
1124 // SR_lock to allow the thread to reach a stable thread state if
1125 // it is currently in a transient thread state.
1126 return is_ext_suspend_completed(false /*!called_by_wait */,
1127 SuspendRetryDelay, bits);
1128 }
1129
1130 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1131 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1132 // passed as the count and delay parameters. Experiments with specific
1133 // calls to wait_for_ext_suspend_completion() can be done by passing
1134 // other values in the code. Experiments with all calls can be done
1135 // via the appropriate -XX options.
1136 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1137
1138 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1139 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1140
1141 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1142 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1143 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1144
1145 bool is_external_suspend() const {
1146 return (_suspend_flags & _external_suspend) != 0;
1147 }
1148 // Whenever a thread transitions from native to vm/java it must suspend
1149 // if external|deopt suspend is present.
1150 bool is_suspend_after_native() const {
1151 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1152 }
1153
1154 // external suspend request is completed
1155 bool is_ext_suspended() const {
1156 return (_suspend_flags & _ext_suspended) != 0;
1157 }
1158
1159 bool is_external_suspend_with_lock() const {
1160 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1161 return is_external_suspend();
1162 }
1163
1164 // Special method to handle a pending external suspend request
1165 // when a suspend equivalent condition lifts.
1166 bool handle_special_suspend_equivalent_condition() {
1167 assert(is_suspend_equivalent(),
1168 "should only be called in a suspend equivalence condition");
1169 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1170 bool ret = is_external_suspend();
1171 if (!ret) {
1172 // not about to self-suspend so clear suspend equivalence
1173 clear_suspend_equivalent();
1174 }
1175 // implied else:
1176 // We have a pending external suspend request so we leave the
1177 // suspend_equivalent flag set until java_suspend_self() sets
1178 // the ext_suspended flag and clears the suspend_equivalent
1179 // flag. This insures that wait_for_ext_suspend_completion()
1180 // will return consistent values.
1181 return ret;
1182 }
1183
1184 // utility methods to see if we are doing some kind of suspension
1185 bool is_being_ext_suspended() const {
1186 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1187 return is_ext_suspended() || is_external_suspend();
1188 }
1189
1190 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1191
1192 void set_suspend_equivalent() { _suspend_equivalent = true; };
1193 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1194
1195 // Thread.stop support
1196 void send_thread_stop(oop throwable);
1197 AsyncRequests clear_special_runtime_exit_condition() {
1198 AsyncRequests x = _special_runtime_exit_condition;
1199 _special_runtime_exit_condition = _no_async_condition;
1200 return x;
1201 }
1202
1203 // Are any async conditions present?
1204 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1205
1206 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1207
1208 // these next two are also used for self-suspension and async exception support
1209 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1210
1211 // Return true if JavaThread has an asynchronous condition or
1212 // if external suspension is requested.
1213 bool has_special_runtime_exit_condition() {
1214 // We call is_external_suspend() last since external suspend should
1215 // be less common. Because we don't use is_external_suspend_with_lock
1216 // it is possible that we won't see an asynchronous external suspend
1217 // request that has just gotten started, i.e., SR_lock grabbed but
1218 // _external_suspend field change either not made yet or not visible
1219 // yet. However, this is okay because the request is asynchronous and
1220 // we will see the new flag value the next time through. It's also
1221 // possible that the external suspend request is dropped after
1222 // we have checked is_external_suspend(), we will recheck its value
1223 // under SR_lock in java_suspend_self().
1224 return (_special_runtime_exit_condition != _no_async_condition) ||
1225 is_external_suspend() || is_deopt_suspend();
1226 }
1227
1228 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1229
1230 void set_pending_async_exception(oop e) {
1231 _pending_async_exception = e;
1232 _special_runtime_exit_condition = _async_exception;
1233 set_has_async_exception();
1234 }
1235
1236 // Fast-locking support
1237 bool is_lock_owned(address adr) const;
1238
1239 // Accessors for vframe array top
1240 // The linked list of vframe arrays are sorted on sp. This means when we
1241 // unpack the head must contain the vframe array to unpack.
1242 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1243 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1244
1245 // Side structure for deferring update of java frame locals until deopt occurs
1246 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1247 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1248
1249 // These only really exist to make debugging deopt problems simpler
1250
1251 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1252 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1253
1254 // The special resourceMark used during deoptimization
1255
1256 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1257 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1258
1259 intptr_t* must_deopt_id() { return _must_deopt_id; }
1260 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1261 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1262
1263 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1264 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1265
1266 Method* callee_target() const { return _callee_target; }
1267 void set_callee_target (Method* x) { _callee_target = x; }
1268
1269 // Oop results of vm runtime calls
1270 oop vm_result() const { return _vm_result; }
1271 void set_vm_result (oop x) { _vm_result = x; }
1272
1273 Metadata* vm_result_2() const { return _vm_result_2; }
1274 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1275
1276 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1277 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1278
1279 // Exception handling for compiled methods
1280 oop exception_oop() const { return _exception_oop; }
1281 address exception_pc() const { return _exception_pc; }
1282 address exception_handler_pc() const { return _exception_handler_pc; }
1283 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1284
1285 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1286 void set_exception_pc(address a) { _exception_pc = a; }
1287 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1288 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1289
1290 void clear_exception_oop_and_pc() {
1291 set_exception_oop(NULL);
1292 set_exception_pc(NULL);
1293 }
1294
1295 // Stack overflow support
1296 inline size_t stack_available(address cur_sp);
1297 address stack_yellow_zone_base()
1298 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1299 size_t stack_yellow_zone_size()
1300 { return StackYellowPages * os::vm_page_size(); }
1301 address stack_red_zone_base()
1302 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1303 size_t stack_red_zone_size()
1304 { return StackRedPages * os::vm_page_size(); }
1305 bool in_stack_yellow_zone(address a)
1306 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1307 bool in_stack_red_zone(address a)
1308 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1309
1310 void create_stack_guard_pages();
1311 void remove_stack_guard_pages();
1312
1313 void enable_stack_yellow_zone();
1314 void disable_stack_yellow_zone();
1315 void enable_stack_red_zone();
1316 void disable_stack_red_zone();
1317
1318 inline bool stack_guard_zone_unused();
1319 inline bool stack_yellow_zone_disabled();
1320 inline bool stack_yellow_zone_enabled();
1321
1322 // Attempt to reguard the stack after a stack overflow may have occurred.
1323 // Returns true if (a) guard pages are not needed on this thread, (b) the
1324 // pages are already guarded, or (c) the pages were successfully reguarded.
1325 // Returns false if there is not enough stack space to reguard the pages, in
1326 // which case the caller should unwind a frame and try again. The argument
1327 // should be the caller's (approximate) sp.
1328 bool reguard_stack(address cur_sp);
1329 // Similar to above but see if current stackpoint is out of the guard area
1330 // and reguard if possible.
1331 bool reguard_stack(void);
1332
1333 address stack_overflow_limit() { return _stack_overflow_limit; }
1334 void set_stack_overflow_limit() {
1335 _stack_overflow_limit = _stack_base - _stack_size +
1336 ((StackShadowPages +
1337 StackYellowPages +
1338 StackRedPages) * os::vm_page_size());
1339 }
1340
1341 // Misc. accessors/mutators
1342 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1343 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1344 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1345
1346 #ifndef PRODUCT
1347 void record_jump(address target, address instr, const char* file, int line);
1348 #endif /* PRODUCT */
1349
1350 // For assembly stub generation
1351 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1352 #ifndef PRODUCT
1353 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1354 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1355 #endif /* PRODUCT */
1356 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1357 static ByteSize last_Java_sp_offset() {
1358 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1359 }
1360 static ByteSize last_Java_pc_offset() {
1361 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1362 }
1363 static ByteSize frame_anchor_offset() {
1364 return byte_offset_of(JavaThread, _anchor);
1365 }
1366 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1367 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1368 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1369 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1370 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1371 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1372 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1373 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1374 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1375 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1376 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1377 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1378 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1379
1380 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1381 static ByteSize should_post_on_exceptions_flag_offset() {
1382 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1383 }
1384
1385 #if INCLUDE_ALL_GCS
1386 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1387 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1388 #endif // INCLUDE_ALL_GCS
1389
1390 // Returns the jni environment for this thread
1391 JNIEnv* jni_environment() { return &_jni_environment; }
1392
1393 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1394 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1395 // Only return NULL if thread is off the thread list; starting to
1396 // exit should not return NULL.
1397 if (thread_from_jni_env->is_terminated()) {
1398 thread_from_jni_env->block_if_vm_exited();
1399 return NULL;
1400 } else {
1401 return thread_from_jni_env;
1402 }
1403 }
1404
1405 // JNI critical regions. These can nest.
1406 bool in_critical() { return _jni_active_critical > 0; }
1407 bool in_last_critical() { return _jni_active_critical == 1; }
1408 void enter_critical() { assert(Thread::current() == this ||
1409 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1410 "this must be current thread or synchronizing");
1411 _jni_active_critical++; }
1412 void exit_critical() { assert(Thread::current() == this,
1413 "this must be current thread");
1414 _jni_active_critical--;
1415 assert(_jni_active_critical >= 0,
1416 "JNI critical nesting problem?"); }
1417
1418 // For deadlock detection
1419 int depth_first_number() { return _depth_first_number; }
1420 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1421
1422 private:
1423 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1424
1425 public:
1426 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1427 void add_monitor_chunk(MonitorChunk* chunk);
1428 void remove_monitor_chunk(MonitorChunk* chunk);
1429 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1430 void inc_in_deopt_handler() { _in_deopt_handler++; }
1431 void dec_in_deopt_handler() {
1432 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1433 if (_in_deopt_handler > 0) { // robustness
1434 _in_deopt_handler--;
1435 }
1436 }
1437
1438 private:
1439 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1440
1441 public:
1442
1443 // Frame iteration; calls the function f for all frames on the stack
1444 void frames_do(void f(frame*, const RegisterMap*));
1445
1446 // Memory operations
1447 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1448
1449 // Sweeper operations
1450 void nmethods_do(CodeBlobClosure* cf);
1451
1452 // RedefineClasses Support
1453 void metadata_do(void f(Metadata*));
1454
1455 // Memory management operations
1456 void gc_epilogue();
1457 void gc_prologue();
1458
1459 // Misc. operations
1460 char* name() const { return (char*)get_thread_name(); }
1461 void print_on(outputStream* st) const;
1462 void print() const { print_on(tty); }
1463 void print_value();
1464 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1465 void print_thread_state() const PRODUCT_RETURN;
1466 void print_on_error(outputStream* st, char* buf, int buflen) const;
1467 void verify();
1468 const char* get_thread_name() const;
1469 private:
1470 // factor out low-level mechanics for use in both normal and error cases
1471 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1472 public:
1473 const char* get_threadgroup_name() const;
1474 const char* get_parent_name() const;
1475
1476 // Accessing frames
1477 frame last_frame() {
1478 _anchor.make_walkable(this);
1479 return pd_last_frame();
1480 }
1481 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1482
1483 // Returns method at 'depth' java or native frames down the stack
1484 // Used for security checks
1485 Klass* security_get_caller_class(int depth);
1486
1487 // Print stack trace in external format
1488 void print_stack_on(outputStream* st);
1489 void print_stack() { print_stack_on(tty); }
1490
1491 // Print stack traces in various internal formats
1492 void trace_stack() PRODUCT_RETURN;
1493 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1494 void trace_frames() PRODUCT_RETURN;
1495 void trace_oops() PRODUCT_RETURN;
1496
1497 // Print an annotated view of the stack frames
1498 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1499 void validate_frame_layout() {
1500 print_frame_layout(0, true);
1501 }
1502
1503 // Returns the number of stack frames on the stack
1504 int depth() const;
1505
1506 // Function for testing deoptimization
1507 void deoptimize();
1508 void make_zombies();
1509
1510 void deoptimized_wrt_marked_nmethods();
1511
1512 // Profiling operation (see fprofile.cpp)
1513 public:
1514 bool profile_last_Java_frame(frame* fr);
1515
1516 private:
1517 ThreadProfiler* _thread_profiler;
1518 private:
1519 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1520 friend class FlatProfilerTask; // uses get_thread_profiler.
1521 friend class ThreadProfilerMark; // uses get_thread_profiler.
1522 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1523 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1524 ThreadProfiler* result = _thread_profiler;
1525 _thread_profiler = tp;
1526 return result;
1527 }
1528
1529 // NMT (Native memory tracking) support.
1530 // This flag helps NMT to determine if this JavaThread will be blocked
1531 // at safepoint. If not, ThreadCritical is needed for writing memory records.
1532 // JavaThread is only safepoint visible when it is in Threads' thread list,
1533 // it is not visible until it is added to the list and becomes invisible
1534 // once it is removed from the list.
1535 public:
1536 bool is_safepoint_visible() const { return _safepoint_visible; }
1537 void set_safepoint_visible(bool visible) { _safepoint_visible = visible; }
1538 private:
1539 bool _safepoint_visible;
1540
1541 // Static operations
1542 public:
1543 // Returns the running thread as a JavaThread
1544 static inline JavaThread* current();
1545
1546 // Returns the active Java thread. Do not use this if you know you are calling
1547 // from a JavaThread, as it's slower than JavaThread::current. If called from
1548 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1549 // operation. You may not want that either.
1550 static JavaThread* active();
1551
1552 inline CompilerThread* as_CompilerThread();
1553
1554 public:
1555 virtual void run();
1556 void thread_main_inner();
1557
1558 private:
1559 // PRIVILEGED STACK
1560 PrivilegedElement* _privileged_stack_top;
1561 GrowableArray<oop>* _array_for_gc;
1562 public:
1563
1564 // Returns the privileged_stack information.
1565 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1566 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1567 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1568
1569 public:
1570 // Thread local information maintained by JVMTI.
1571 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1572 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1573 // getter is used to get this JavaThread's JvmtiThreadState if it has
1574 // one which means NULL can be returned. JvmtiThreadState::state_for()
1575 // is used to get the specified JavaThread's JvmtiThreadState if it has
1576 // one or it allocates a new JvmtiThreadState for the JavaThread and
1577 // returns it. JvmtiThreadState::state_for() will return NULL only if
1578 // the specified JavaThread is exiting.
1579 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1580 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1581 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1582 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1583
1584 // JVMTI PopFrame support
1585 // Setting and clearing popframe_condition
1586 // All of these enumerated values are bits. popframe_pending
1587 // indicates that a PopFrame() has been requested and not yet been
1588 // completed. popframe_processing indicates that that PopFrame() is in
1589 // the process of being completed. popframe_force_deopt_reexecution_bit
1590 // indicates that special handling is required when returning to a
1591 // deoptimized caller.
1592 enum PopCondition {
1593 popframe_inactive = 0x00,
1594 popframe_pending_bit = 0x01,
1595 popframe_processing_bit = 0x02,
1596 popframe_force_deopt_reexecution_bit = 0x04
1597 };
1598 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1599 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1600 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1601 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1602 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1603 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1604 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1605 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1606 #ifdef CC_INTERP
1607 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1608 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1609 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1610 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1611 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1612 #endif
1613
1614 private:
1615 // Saved incoming arguments to popped frame.
1616 // Used only when popped interpreted frame returns to deoptimized frame.
1617 void* _popframe_preserved_args;
1618 int _popframe_preserved_args_size;
1619
1620 public:
1621 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1622 void* popframe_preserved_args();
1623 ByteSize popframe_preserved_args_size();
1624 WordSize popframe_preserved_args_size_in_words();
1625 void popframe_free_preserved_args();
1626
1627
1628 private:
1629 JvmtiThreadState *_jvmti_thread_state;
1630 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1631
1632 // Used by the interpreter in fullspeed mode for frame pop, method
1633 // entry, method exit and single stepping support. This field is
1634 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1635 // It can be set to zero asynchronously (i.e., without a VM operation
1636 // or a lock) so we have to be very careful.
1637 int _interp_only_mode;
1638
1639 public:
1640 // used by the interpreter for fullspeed debugging support (see above)
1641 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1642 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1643 int get_interp_only_mode() { return _interp_only_mode; }
1644 void increment_interp_only_mode() { ++_interp_only_mode; }
1645 void decrement_interp_only_mode() { --_interp_only_mode; }
1646
1647 // support for cached flag that indicates whether exceptions need to be posted for this thread
1648 // if this is false, we can avoid deoptimizing when events are thrown
1649 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1650 private:
1651 int _should_post_on_exceptions_flag;
1652
1653 public:
1654 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1655 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1656
1657 private:
1658 ThreadStatistics *_thread_stat;
1659
1660 public:
1661 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1662
1663 // Return a blocker object for which this thread is blocked parking.
1664 oop current_park_blocker();
1665
1666 private:
1667 static size_t _stack_size_at_create;
1668
1669 public:
1670 static inline size_t stack_size_at_create(void) {
1671 return _stack_size_at_create;
1672 }
1673 static inline void set_stack_size_at_create(size_t value) {
1674 _stack_size_at_create = value;
1675 }
1676
1677 #if INCLUDE_ALL_GCS
1678 // SATB marking queue support
1679 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1680 static SATBMarkQueueSet& satb_mark_queue_set() {
1681 return _satb_mark_queue_set;
1682 }
1683
1684 // Dirty card queue support
1685 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1686 static DirtyCardQueueSet& dirty_card_queue_set() {
1687 return _dirty_card_queue_set;
1688 }
1689 #endif // INCLUDE_ALL_GCS
1690
1691 // This method initializes the SATB and dirty card queues before a
1692 // JavaThread is added to the Java thread list. Right now, we don't
1693 // have to do anything to the dirty card queue (it should have been
1694 // activated when the thread was created), but we have to activate
1695 // the SATB queue if the thread is created while a marking cycle is
1696 // in progress. The activation / de-activation of the SATB queues at
1697 // the beginning / end of a marking cycle is done during safepoints
1698 // so we have to make sure this method is called outside one to be
1699 // able to safely read the active field of the SATB queue set. Right
1700 // now, it is called just before the thread is added to the Java
1701 // thread list in the Threads::add() method. That method is holding
1702 // the Threads_lock which ensures we are outside a safepoint. We
1703 // cannot do the obvious and set the active field of the SATB queue
1704 // when the thread is created given that, in some cases, safepoints
1705 // might happen between the JavaThread constructor being called and the
1706 // thread being added to the Java thread list (an example of this is
1707 // when the structure for the DestroyJavaVM thread is created).
1708 #if INCLUDE_ALL_GCS
1709 void initialize_queues();
1710 #else // INCLUDE_ALL_GCS
1711 void initialize_queues() { }
1712 #endif // INCLUDE_ALL_GCS
1713
1714 // Machine dependent stuff
1715 #ifdef TARGET_OS_ARCH_linux_x86
1716 # include "thread_linux_x86.hpp"
1717 #endif
1718 #ifdef TARGET_OS_ARCH_linux_sparc
1719 # include "thread_linux_sparc.hpp"
1720 #endif
1721 #ifdef TARGET_OS_ARCH_linux_zero
1722 # include "thread_linux_zero.hpp"
1723 #endif
1724 #ifdef TARGET_OS_ARCH_solaris_x86
1725 # include "thread_solaris_x86.hpp"
1726 #endif
1727 #ifdef TARGET_OS_ARCH_solaris_sparc
1728 # include "thread_solaris_sparc.hpp"
1729 #endif
1730 #ifdef TARGET_OS_ARCH_windows_x86
1731 # include "thread_windows_x86.hpp"
1732 #endif
1733 #ifdef TARGET_OS_ARCH_linux_arm
1734 # include "thread_linux_arm.hpp"
1735 #endif
1736 #ifdef TARGET_OS_ARCH_linux_ppc
1737 # include "thread_linux_ppc.hpp"
1738 #endif
1739 #ifdef TARGET_OS_ARCH_aix_ppc
1740 # include "thread_aix_ppc.hpp"
1741 #endif
1742 #ifdef TARGET_OS_ARCH_bsd_x86
1743 # include "thread_bsd_x86.hpp"
1744 #endif
1745 #ifdef TARGET_OS_ARCH_bsd_zero
1746 # include "thread_bsd_zero.hpp"
1747 #endif
1748
1749
1750 public:
1751 void set_blocked_on_compilation(bool value) {
1752 _blocked_on_compilation = value;
1753 }
1754
1755 bool blocked_on_compilation() {
1756 return _blocked_on_compilation;
1757 }
1758 protected:
1759 bool _blocked_on_compilation;
1760
1761
1762 // JSR166 per-thread parker
1763 private:
1764 Parker* _parker;
1765 public:
1766 Parker* parker() { return _parker; }
1767
1768 // Biased locking support
1769 private:
1770 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1771 public:
1772 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1773 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1774
1775 // clearing/querying jni attach status
1776 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1777 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1778 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); }
1779 private:
1780 // This field is used to determine if a thread has claimed
1781 // a par_id: it is -1 if the thread has not claimed a par_id;
1782 // otherwise its value is the par_id that has been claimed.
1783 int _claimed_par_id;
1784 public:
1785 int get_claimed_par_id() { return _claimed_par_id; }
1786 void set_claimed_par_id(int id) { _claimed_par_id = id;}
1787 };
1788
1789 // Inline implementation of JavaThread::current
1790 inline JavaThread* JavaThread::current() {
1791 Thread* thread = ThreadLocalStorage::thread();
1792 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1793 return (JavaThread*)thread;
1794 }
1795
1796 inline CompilerThread* JavaThread::as_CompilerThread() {
1797 assert(is_Compiler_thread(), "just checking");
1798 return (CompilerThread*)this;
1799 }
1800
1801 inline bool JavaThread::stack_guard_zone_unused() {
1802 return _stack_guard_state == stack_guard_unused;
1803 }
1804
1805 inline bool JavaThread::stack_yellow_zone_disabled() {
1806 return _stack_guard_state == stack_guard_yellow_disabled;
1807 }
1808
1809 inline bool JavaThread::stack_yellow_zone_enabled() {
1810 #ifdef ASSERT
1811 if (os::uses_stack_guard_pages()) {
1812 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1813 }
1814 #endif
1815 return _stack_guard_state == stack_guard_enabled;
1816 }
1817
1818 inline size_t JavaThread::stack_available(address cur_sp) {
1819 // This code assumes java stacks grow down
1820 address low_addr; // Limit on the address for deepest stack depth
1821 if ( _stack_guard_state == stack_guard_unused) {
1822 low_addr = stack_base() - stack_size();
1823 } else {
1824 low_addr = stack_yellow_zone_base();
1825 }
1826 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1827 }
1828
1829 // A thread used for Compilation.
1830 class CompilerThread : public JavaThread {
1831 friend class VMStructs;
1832 private:
1833 CompilerCounters* _counters;
1834
1835 ciEnv* _env;
1836 CompileLog* _log;
1837 CompileTask* _task;
1838 CompileQueue* _queue;
1839 BufferBlob* _buffer_blob;
1840
1841 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1842 AbstractCompiler* _compiler;
1843
1844 public:
1845
1846 static CompilerThread* current();
1847
1848 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1849
1850 bool is_Compiler_thread() const { return true; }
1851 // Hide this compiler thread from external view.
1852 bool is_hidden_from_external_view() const { return true; }
1853
1854 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1855 AbstractCompiler* compiler() const { return _compiler; }
1856
1857 CompileQueue* queue() const { return _queue; }
1858 CompilerCounters* counters() const { return _counters; }
1859
1860 // Get/set the thread's compilation environment.
1861 ciEnv* env() { return _env; }
1862 void set_env(ciEnv* env) { _env = env; }
1863
1864 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1865 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1866
1867 // Get/set the thread's logging information
1868 CompileLog* log() { return _log; }
1869 void init_log(CompileLog* log) {
1870 // Set once, for good.
1871 assert(_log == NULL, "set only once");
1872 _log = log;
1873 }
1874
1875 // GC support
1876 // Apply "f->do_oop" to all root oops in "this".
1877 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1878 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1879
1880 #ifndef PRODUCT
1881 private:
1882 IdealGraphPrinter *_ideal_graph_printer;
1883 public:
1884 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1885 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1886 #endif
1887
1888 // Get/set the thread's current task
1889 CompileTask* task() { return _task; }
1890 void set_task(CompileTask* task) { _task = task; }
1891
1892 // Track the nmethod currently being scanned by the sweeper
1893 void set_scanned_nmethod(nmethod* nm) {
1894 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1895 _scanned_nmethod = nm;
1896 }
1897 };
1898
1899 inline CompilerThread* CompilerThread::current() {
1900 return JavaThread::current()->as_CompilerThread();
1901 }
1902
1903
1904 // The active thread queue. It also keeps track of the current used
1905 // thread priorities.
1906 class Threads: AllStatic {
1907 friend class VMStructs;
1908 private:
1909 static JavaThread* _thread_list;
1910 static int _number_of_threads;
1911 static int _number_of_non_daemon_threads;
1912 static int _return_code;
1913 #ifdef ASSERT
1914 static bool _vm_complete;
1915 #endif
1916
1917 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
1918 static void initialize_jsr292_core_classes(TRAPS);
1919 public:
1920 // Thread management
1921 // force_daemon is a concession to JNI, where we may need to add a
1922 // thread to the thread list before allocating its thread object
1923 static void add(JavaThread* p, bool force_daemon = false);
1924 static void remove(JavaThread* p);
1925 static bool includes(JavaThread* p);
1926 static JavaThread* first() { return _thread_list; }
1927 static void threads_do(ThreadClosure* tc);
1928
1929 // Initializes the vm and creates the vm thread
1930 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1931 static void convert_vm_init_libraries_to_agents();
1932 static void create_vm_init_libraries();
1933 static void create_vm_init_agents();
1934 static void shutdown_vm_agents();
1935 static bool destroy_vm();
1936 // Supported VM versions via JNI
1937 // Includes JNI_VERSION_1_1
1938 static jboolean is_supported_jni_version_including_1_1(jint version);
1939 // Does not include JNI_VERSION_1_1
1940 static jboolean is_supported_jni_version(jint version);
1941
1942 // Garbage collection
1943 static void follow_other_roots(void f(oop*));
1944
1945 // Apply "f->do_oop" to all root oops in all threads.
1946 // This version may only be called by sequential code.
1947 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1948 // This version may be called by sequential or parallel code.
1949 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1950 // This creates a list of GCTasks, one per thread.
1951 static void create_thread_roots_tasks(GCTaskQueue* q);
1952 // This creates a list of GCTasks, one per thread, for marking objects.
1953 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1954
1955 // Apply "f->do_oop" to roots in all threads that
1956 // are part of compiled frames
1957 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1958
1959 static void convert_hcode_pointers();
1960 static void restore_hcode_pointers();
1961
1962 // Sweeper
1963 static void nmethods_do(CodeBlobClosure* cf);
1964
1965 // RedefineClasses support
1966 static void metadata_do(void f(Metadata*));
1967
1968 static void gc_epilogue();
1969 static void gc_prologue();
1970 #ifdef ASSERT
1971 static bool is_vm_complete() { return _vm_complete; }
1972 #endif
1973
1974 // Verification
1975 static void verify();
1976 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1977 static void print(bool print_stacks, bool internal_format) {
1978 // this function is only used by debug.cpp
1979 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1980 }
1981 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1982
1983 // Get Java threads that are waiting to enter a monitor. If doLock
1984 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1985 // VM needs to be at a safepoint.
1986 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1987 address monitor, bool doLock);
1988
1989 // Get owning Java thread from the monitor's owner field. If doLock
1990 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1991 // VM needs to be at a safepoint.
1992 static JavaThread *owning_thread_from_monitor_owner(address owner,
1993 bool doLock);
1994
1995 // Number of threads on the active threads list
1996 static int number_of_threads() { return _number_of_threads; }
1997 // Number of non-daemon threads on the active threads list
1998 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1999
2000 // Deoptimizes all frames tied to marked nmethods
2001 static void deoptimized_wrt_marked_nmethods();
2002
2003 };
2004
2005
2006 // Thread iterator
2007 class ThreadClosure: public StackObj {
2008 public:
2009 virtual void do_thread(Thread* thread) = 0;
2010 };
2011
2012 class SignalHandlerMark: public StackObj {
2013 private:
2014 Thread* _thread;
2015 public:
2016 SignalHandlerMark(Thread* t) {
2017 _thread = t;
2018 if (_thread) _thread->enter_signal_handler();
2019 }
2020 ~SignalHandlerMark() {
2021 if (_thread) _thread->leave_signal_handler();
2022 _thread = NULL;
2023 }
2024 };
2025
2026
2027 #endif // SHARE_VM_RUNTIME_THREAD_HPP