1 /*
2 * Copyright (c) 1997, 2013, 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 // Record when GC is locked out via the GC_locker mechanism
253 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
254
255 friend class No_Alloc_Verifier;
256 friend class No_Safepoint_Verifier;
257 friend class Pause_No_Safepoint_Verifier;
258 friend class ThreadLocalStorage;
259 friend class GC_locker;
260
261 ThreadLocalAllocBuffer _tlab; // Thread-local eden
262 jlong _allocated_bytes; // Cumulative number of bytes allocated on
263 // the Java heap
264
265 TRACE_DATA _trace_data; // Thread-local data for tracing
266
267 int _vm_operation_started_count; // VM_Operation support
268 int _vm_operation_completed_count; // VM_Operation support
269
270 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
271 // is waiting to lock
272 bool _current_pending_monitor_is_from_java; // locking is from Java code
273
274 // ObjectMonitor on which this thread called Object.wait()
275 ObjectMonitor* _current_waiting_monitor;
276
277 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
278 public:
279 ObjectMonitor* omFreeList;
280 int omFreeCount; // length of omFreeList
281 int omFreeProvision; // reload chunk size
282 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
283 int omInUseCount; // length of omInUseList
284
285 #ifdef ASSERT
286 private:
287 bool _visited_for_critical_count;
288
289 public:
290 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
291 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
292 #endif
293
294 public:
295 enum {
296 is_definitely_current_thread = true
297 };
298
299 // Constructor
300 Thread();
301 virtual ~Thread();
302
303 // initializtion
304 void initialize_thread_local_storage();
305
306 // thread entry point
307 virtual void run();
308
309 // Testers
310 virtual bool is_VM_thread() const { return false; }
311 virtual bool is_Java_thread() const { return false; }
312 virtual bool is_Compiler_thread() const { return false; }
313 virtual bool is_hidden_from_external_view() const { return false; }
314 virtual bool is_jvmti_agent_thread() const { return false; }
315 // True iff the thread can perform GC operations at a safepoint.
316 // Generally will be true only of VM thread and parallel GC WorkGang
317 // threads.
318 virtual bool is_GC_task_thread() const { return false; }
319 virtual bool is_Watcher_thread() const { return false; }
320 virtual bool is_ConcurrentGC_thread() const { return false; }
321 virtual bool is_Named_thread() const { return false; }
322 virtual bool is_Worker_thread() const { return false; }
323
324 // Casts
325 virtual WorkerThread* as_Worker_thread() const { return NULL; }
326
327 virtual char* name() const { return (char*)"Unknown thread"; }
328
329 // Returns the current thread
330 static inline Thread* current();
331
332 // Common thread operations
333 static void set_priority(Thread* thread, ThreadPriority priority);
334 static ThreadPriority get_priority(const Thread* const thread);
335 static void start(Thread* thread);
336 static void interrupt(Thread* thr);
337 static bool is_interrupted(Thread* thr, bool clear_interrupted);
338
339 void set_native_thread_name(const char *name) {
340 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
341 os::set_native_thread_name(name);
342 }
343
344 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
345 Monitor* SR_lock() const { return _SR_lock; }
346
347 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
348
349 void set_suspend_flag(SuspendFlags f) {
350 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
351 uint32_t flags;
352 do {
353 flags = _suspend_flags;
354 }
355 while (Atomic::cmpxchg((jint)(flags | f),
356 (volatile jint*)&_suspend_flags,
357 (jint)flags) != (jint)flags);
358 }
359 void clear_suspend_flag(SuspendFlags f) {
360 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
361 uint32_t flags;
362 do {
363 flags = _suspend_flags;
364 }
365 while (Atomic::cmpxchg((jint)(flags & ~f),
366 (volatile jint*)&_suspend_flags,
367 (jint)flags) != (jint)flags);
368 }
369
370 void set_has_async_exception() {
371 set_suspend_flag(_has_async_exception);
372 }
373 void clear_has_async_exception() {
374 clear_suspend_flag(_has_async_exception);
375 }
376
377 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
378
379 void set_critical_native_unlock() {
380 set_suspend_flag(_critical_native_unlock);
381 }
382 void clear_critical_native_unlock() {
383 clear_suspend_flag(_critical_native_unlock);
384 }
385
386 // Support for Unhandled Oop detection
387 #ifdef CHECK_UNHANDLED_OOPS
388 private:
389 UnhandledOops* _unhandled_oops;
390 public:
391 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
392 // Mark oop safe for gc. It may be stack allocated but won't move.
393 void allow_unhandled_oop(oop *op) {
394 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
395 }
396 // Clear oops at safepoint so crashes point to unhandled oop violator
397 void clear_unhandled_oops() {
398 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
399 }
400 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
401 #endif // CHECK_UNHANDLED_OOPS
402
403 #ifndef PRODUCT
404 bool skip_gcalot() { return _skip_gcalot; }
405 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
406 #endif
407
408 public:
409 // Installs a pending exception to be inserted later
410 static void send_async_exception(oop thread_oop, oop java_throwable);
411
412 // Resource area
413 ResourceArea* resource_area() const { return _resource_area; }
414 void set_resource_area(ResourceArea* area) { _resource_area = area; }
415
416 OSThread* osthread() const { return _osthread; }
417 void set_osthread(OSThread* thread) { _osthread = thread; }
418
419 // JNI handle support
420 JNIHandleBlock* active_handles() const { return _active_handles; }
421 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
422 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
423 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
424
425 // Internal handle support
426 HandleArea* handle_area() const { return _handle_area; }
427 void set_handle_area(HandleArea* area) { _handle_area = area; }
428
429 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
430 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
431
432 // Thread-Local Allocation Buffer (TLAB) support
433 ThreadLocalAllocBuffer& tlab() { return _tlab; }
434 void initialize_tlab() {
435 if (UseTLAB) {
436 tlab().initialize();
437 }
438 }
439
440 jlong allocated_bytes() { return _allocated_bytes; }
441 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
442 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
443 jlong cooked_allocated_bytes() {
444 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
445 if (UseTLAB) {
446 size_t used_bytes = tlab().used_bytes();
447 if ((ssize_t)used_bytes > 0) {
448 // More-or-less valid tlab. The load_acquire above should ensure
449 // that the result of the add is <= the instantaneous value
450 return allocated_bytes + used_bytes;
451 }
452 }
453 return allocated_bytes;
454 }
455
456 TRACE_DATA* trace_data() { return &_trace_data; }
457
458 // VM operation support
459 int vm_operation_ticket() { return ++_vm_operation_started_count; }
460 int vm_operation_completed_count() { return _vm_operation_completed_count; }
461 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
462
463 // For tracking the heavyweight monitor the thread is pending on.
464 ObjectMonitor* current_pending_monitor() {
465 return _current_pending_monitor;
466 }
467 void set_current_pending_monitor(ObjectMonitor* monitor) {
468 _current_pending_monitor = monitor;
469 }
470 void set_current_pending_monitor_is_from_java(bool from_java) {
471 _current_pending_monitor_is_from_java = from_java;
472 }
473 bool current_pending_monitor_is_from_java() {
474 return _current_pending_monitor_is_from_java;
475 }
476
477 // For tracking the ObjectMonitor on which this thread called Object.wait()
478 ObjectMonitor* current_waiting_monitor() {
479 return _current_waiting_monitor;
480 }
481 void set_current_waiting_monitor(ObjectMonitor* monitor) {
482 _current_waiting_monitor = monitor;
483 }
484
485 // GC support
486 // Apply "f->do_oop" to all root oops in "this".
487 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
488 // Used by JavaThread::oops_do.
489 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
490 virtual void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
491
492 // Handles the parallel case for the method below.
493 private:
494 bool claim_oops_do_par_case(int collection_parity);
495 public:
496 // Requires that "collection_parity" is that of the current strong roots
497 // iteration. If "is_par" is false, sets the parity of "this" to
498 // "collection_parity", and returns "true". If "is_par" is true,
499 // uses an atomic instruction to set the current threads parity to
500 // "collection_parity", if it is not already. Returns "true" iff the
501 // calling thread does the update, this indicates that the calling thread
502 // has claimed the thread's stack as a root groop in the current
503 // collection.
504 bool claim_oops_do(bool is_par, int collection_parity) {
505 if (!is_par) {
506 _oops_do_parity = collection_parity;
507 return true;
508 } else {
509 return claim_oops_do_par_case(collection_parity);
510 }
511 }
512
513 // Sweeper support
514 void nmethods_do(CodeBlobClosure* cf);
515
516 // jvmtiRedefineClasses support
517 void metadata_do(void f(Metadata*));
518
519 // Used by fast lock support
520 virtual bool is_lock_owned(address adr) const;
521
522 // Check if address is in the stack of the thread (not just for locks).
523 // Warning: the method can only be used on the running thread
524 bool is_in_stack(address adr) const;
525 // Check if address is in the usable part of the stack (excludes protected
526 // guard pages)
527 bool is_in_usable_stack(address adr) const;
528
529 // Sets this thread as starting thread. Returns failure if thread
530 // creation fails due to lack of memory, too many threads etc.
531 bool set_as_starting_thread();
532
533 protected:
534 // OS data associated with the thread
535 OSThread* _osthread; // Platform-specific thread information
536
537 // Thread local resource area for temporary allocation within the VM
538 ResourceArea* _resource_area;
539
540 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
541
542 // Thread local handle area for allocation of handles within the VM
543 HandleArea* _handle_area;
544 GrowableArray<Metadata*>* _metadata_handles;
545
546 // Support for stack overflow handling, get_thread, etc.
547 address _stack_base;
548 size_t _stack_size;
549 uintptr_t _self_raw_id; // used by get_thread (mutable)
550 int _lgrp_id;
551
552 public:
553 // Stack overflow support
554 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
555
556 void set_stack_base(address base) { _stack_base = base; }
557 size_t stack_size() const { return _stack_size; }
558 void set_stack_size(size_t size) { _stack_size = size; }
559 void record_stack_base_and_size();
560
561 bool on_local_stack(address adr) const {
562 /* QQQ this has knowledge of direction, ought to be a stack method */
563 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
564 }
565
566 uintptr_t self_raw_id() { return _self_raw_id; }
567 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
568
569 int lgrp_id() const { return _lgrp_id; }
570 void set_lgrp_id(int value) { _lgrp_id = value; }
571
572 // Printing
573 void print_on(outputStream* st) const;
574 void print() const { print_on(tty); }
575 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
576
577 // Debug-only code
578 #ifdef ASSERT
579 private:
580 // Deadlock detection support for Mutex locks. List of locks own by thread.
581 Monitor* _owned_locks;
582 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
583 // thus the friendship
584 friend class Mutex;
585 friend class Monitor;
586
587 public:
588 void print_owned_locks_on(outputStream* st) const;
589 void print_owned_locks() const { print_owned_locks_on(tty); }
590 Monitor* owned_locks() const { return _owned_locks; }
591 bool owns_locks() const { return owned_locks() != NULL; }
592 bool owns_locks_but_compiled_lock() const;
593
594 // Deadlock detection
595 bool allow_allocation() { return _allow_allocation_count == 0; }
596 ResourceMark* current_resource_mark() { return _current_resource_mark; }
597 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
598 #endif
599
600 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
601
602 private:
603 volatile int _jvmti_env_iteration_count;
604
605 public:
606 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
607 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
608 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
609
610 // Code generation
611 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
612 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
613 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
614
615 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
616 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
617
618 #define TLAB_FIELD_OFFSET(name) \
619 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
620
621 TLAB_FIELD_OFFSET(start)
622 TLAB_FIELD_OFFSET(end)
623 TLAB_FIELD_OFFSET(top)
624 TLAB_FIELD_OFFSET(pf_top)
625 TLAB_FIELD_OFFSET(size) // desired_size
626 TLAB_FIELD_OFFSET(refill_waste_limit)
627 TLAB_FIELD_OFFSET(number_of_refills)
628 TLAB_FIELD_OFFSET(fast_refill_waste)
629 TLAB_FIELD_OFFSET(slow_allocations)
630
631 #undef TLAB_FIELD_OFFSET
632
633 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
634
635 public:
636 volatile intptr_t _Stalled ;
637 volatile int _TypeTag ;
638 ParkEvent * _ParkEvent ; // for synchronized()
639 ParkEvent * _SleepEvent ; // for Thread.sleep
640 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
641 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
642 int NativeSyncRecursion ; // diagnostic
643
644 volatile int _OnTrap ; // Resume-at IP delta
645 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
646 jint _hashStateX ; // thread-specific hashCode generator state
647 jint _hashStateY ;
648 jint _hashStateZ ;
649 void * _schedctl ;
650
651
652 volatile jint rng [4] ; // RNG for spin loop
653
654 // Low-level leaf-lock primitives used to implement synchronization
655 // and native monitor-mutex infrastructure.
656 // Not for general synchronization use.
657 static void SpinAcquire (volatile int * Lock, const char * Name) ;
658 static void SpinRelease (volatile int * Lock) ;
659 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
660 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
661 static void muxRelease (volatile intptr_t * Lock) ;
662 };
663
664 // Inline implementation of Thread::current()
665 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
666 // startup.
667 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
668 // period. This is inlined in thread_<os_family>.inline.hpp.
669
670 inline Thread* Thread::current() {
671 #ifdef ASSERT
672 // This function is very high traffic. Define PARANOID to enable expensive
673 // asserts.
674 #ifdef PARANOID
675 // Signal handler should call ThreadLocalStorage::get_thread_slow()
676 Thread* t = ThreadLocalStorage::get_thread_slow();
677 assert(t != NULL && !t->is_inside_signal_handler(),
678 "Don't use Thread::current() inside signal handler");
679 #endif
680 #endif
681 Thread* thread = ThreadLocalStorage::thread();
682 assert(thread != NULL, "just checking");
683 return thread;
684 }
685
686 // Name support for threads. non-JavaThread subclasses with multiple
687 // uniquely named instances should derive from this.
688 class NamedThread: public Thread {
689 friend class VMStructs;
690 enum {
691 max_name_len = 64
692 };
693 private:
694 char* _name;
695 // log JavaThread being processed by oops_do
696 JavaThread* _processed_thread;
697
698 public:
699 NamedThread();
700 ~NamedThread();
701 // May only be called once per thread.
702 void set_name(const char* format, ...);
703 virtual bool is_Named_thread() const { return true; }
704 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
705 JavaThread *processed_thread() { return _processed_thread; }
706 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
707 };
708
709 // Worker threads are named and have an id of an assigned work.
710 class WorkerThread: public NamedThread {
711 private:
712 uint _id;
713 public:
714 WorkerThread() : _id(0) { }
715 virtual bool is_Worker_thread() const { return true; }
716
717 virtual WorkerThread* as_Worker_thread() const {
718 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
719 return (WorkerThread*) this;
720 }
721
722 void set_id(uint work_id) { _id = work_id; }
723 uint id() const { return _id; }
724 };
725
726 // A single WatcherThread is used for simulating timer interrupts.
727 class WatcherThread: public Thread {
728 friend class VMStructs;
729 public:
730 virtual void run();
731
732 private:
733 static WatcherThread* _watcher_thread;
734
735 static bool _startable;
736 volatile static bool _should_terminate; // updated without holding lock
737
738 os::WatcherThreadCrashProtection* _crash_protection;
739 public:
740 enum SomeConstants {
741 delay_interval = 10 // interrupt delay in milliseconds
742 };
743
744 // Constructor
745 WatcherThread();
746
747 // Tester
748 bool is_Watcher_thread() const { return true; }
749
750 // Printing
751 char* name() const { return (char*)"VM Periodic Task Thread"; }
752 void print_on(outputStream* st) const;
753 void print() const { print_on(tty); }
754 void unpark();
755
756 // Returns the single instance of WatcherThread
757 static WatcherThread* watcher_thread() { return _watcher_thread; }
758
759 // Create and start the single instance of WatcherThread, or stop it on shutdown
760 static void start();
761 static void stop();
762 // Only allow start once the VM is sufficiently initialized
763 // Otherwise the first task to enroll will trigger the start
764 static void make_startable();
765
766 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
767 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
768 _crash_protection = crash_protection;
769 }
770
771 bool has_crash_protection() const { return _crash_protection != NULL; }
772 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
773
774 private:
775 int sleep() const;
776 };
777
778
779 class CompilerThread;
780
781 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
782
783 class JavaThread: public Thread {
784 friend class VMStructs;
785 private:
786 JavaThread* _next; // The next thread in the Threads list
787 oop _threadObj; // The Java level thread object
788
789 #ifdef ASSERT
790 private:
791 int _java_call_counter;
792
793 public:
794 int java_call_counter() { return _java_call_counter; }
795 void inc_java_call_counter() { _java_call_counter++; }
796 void dec_java_call_counter() {
797 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
798 _java_call_counter--;
799 }
800 private: // restore original namespace restriction
801 #endif // ifdef ASSERT
802
803 #ifndef PRODUCT
804 public:
805 enum {
806 jump_ring_buffer_size = 16
807 };
808 private: // restore original namespace restriction
809 #endif
810
811 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
812
813 ThreadFunction _entry_point;
814
815 JNIEnv _jni_environment;
816
817 // Deopt support
818 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
819
820 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
821 // transition out of native
822 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
823 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
824 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
825 // Because deoptimization is lazy we must save jvmti requests to set locals
826 // in compiled frames until we deoptimize and we have an interpreter frame.
827 // This holds the pointer to array (yeah like there might be more than one) of
828 // description of compiled vframes that have locals that need to be updated.
829 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
830
831 // Handshake value for fixing 6243940. We need a place for the i2c
832 // adapter to store the callee Method*. This value is NEVER live
833 // across a gc point so it does NOT have to be gc'd
834 // The handshake is open ended since we can't be certain that it will
835 // be NULLed. This is because we rarely ever see the race and end up
836 // in handle_wrong_method which is the backend of the handshake. See
837 // code in i2c adapters and handle_wrong_method.
838
839 Method* _callee_target;
840
841 // Used to pass back results to the interpreter or generated code running Java code.
842 oop _vm_result; // oop result is GC-preserved
843 Metadata* _vm_result_2; // non-oop result
844
845 // See ReduceInitialCardMarks: this holds the precise space interval of
846 // the most recent slow path allocation for which compiled code has
847 // elided card-marks for performance along the fast-path.
848 MemRegion _deferred_card_mark;
849
850 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
851 // allocated during deoptimization
852 // and by JNI_MonitorEnter/Exit
853
854 // Async. requests support
855 enum AsyncRequests {
856 _no_async_condition = 0,
857 _async_exception,
858 _async_unsafe_access_error
859 };
860 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
861 oop _pending_async_exception;
862
863 // Safepoint support
864 public: // Expose _thread_state for SafeFetchInt()
865 volatile JavaThreadState _thread_state;
866 private:
867 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
868 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
869
870 // JavaThread termination support
871 enum TerminatedTypes {
872 _not_terminated = 0xDEAD - 2,
873 _thread_exiting, // JavaThread::exit() has been called for this thread
874 _thread_terminated, // JavaThread is removed from thread list
875 _vm_exited // JavaThread is still executing native code, but VM is terminated
876 // only VM_Exit can set _vm_exited
877 };
878
879 // In general a JavaThread's _terminated field transitions as follows:
880 //
881 // _not_terminated => _thread_exiting => _thread_terminated
882 //
883 // _vm_exited is a special value to cover the case of a JavaThread
884 // executing native code after the VM itself is terminated.
885 volatile TerminatedTypes _terminated;
886 // suspend/resume support
887 volatile bool _suspend_equivalent; // Suspend equivalent condition
888 jint _in_deopt_handler; // count of deoptimization
889 // handlers thread is in
890 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
891 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
892 // never locked) when throwing an exception. Used by interpreter only.
893
894 // JNI attach states:
895 enum JNIAttachStates {
896 _not_attaching_via_jni = 1, // thread is not attaching via JNI
897 _attaching_via_jni, // thread is attaching via JNI
898 _attached_via_jni // thread has attached via JNI
899 };
900
901 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
902 // A native thread that is attaching via JNI starts with a value
903 // of _attaching_via_jni and transitions to _attached_via_jni.
904 volatile JNIAttachStates _jni_attach_state;
905
906 public:
907 // State of the stack guard pages for this thread.
908 enum StackGuardState {
909 stack_guard_unused, // not needed
910 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
911 stack_guard_enabled // enabled
912 };
913
914 private:
915
916 StackGuardState _stack_guard_state;
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 compilation
927 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
928
929 // support for JNI critical regions
930 jint _jni_active_critical; // count of entries into JNI critical region
931
932 // For deadlock detection.
933 int _depth_first_number;
934
935 // JVMTI PopFrame support
936 // This is set to popframe_pending to signal that top Java frame should be popped immediately
937 int _popframe_condition;
938
939 #ifndef PRODUCT
940 int _jmp_ring_index;
941 struct {
942 // We use intptr_t instead of address so debugger doesn't try and display strings
943 intptr_t _target;
944 intptr_t _instruction;
945 const char* _file;
946 int _line;
947 } _jmp_ring[ jump_ring_buffer_size ];
948 #endif /* PRODUCT */
949
950 #if INCLUDE_ALL_GCS
951 // Support for G1 barriers
952
953 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
954 // Set of all such queues.
955 static SATBMarkQueueSet _satb_mark_queue_set;
956
957 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
958 // Set of all such queues.
959 static DirtyCardQueueSet _dirty_card_queue_set;
960
961 void flush_barrier_queues();
962 #endif // INCLUDE_ALL_GCS
963
964 friend class VMThread;
965 friend class ThreadWaitTransition;
966 friend class VM_Exit;
967
968 void initialize(); // Initialized the instance variables
969
970 public:
971 // Constructor
972 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
973 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
974 ~JavaThread();
975
976 #ifdef ASSERT
977 // verify this JavaThread hasn't be published in the Threads::list yet
978 void verify_not_published();
979 #endif
980
981 //JNI functiontable getter/setter for JVMTI jni function table interception API.
982 void set_jni_functions(struct JNINativeInterface_* functionTable) {
983 _jni_environment.functions = functionTable;
984 }
985 struct JNINativeInterface_* get_jni_functions() {
986 return (struct JNINativeInterface_ *)_jni_environment.functions;
987 }
988
989 // This function is called at thread creation to allow
990 // platform specific thread variables to be initialized.
991 void cache_global_variables();
992
993 // Executes Shutdown.shutdown()
994 void invoke_shutdown_hooks();
995
996 // Cleanup on thread exit
997 enum ExitType {
998 normal_exit,
999 jni_detach
1000 };
1001 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1002
1003 void cleanup_failed_attach_current_thread();
1004
1005 // Testers
1006 virtual bool is_Java_thread() const { return true; }
1007
1008 // compilation
1009 void set_is_compiling(bool f) { _is_compiling = f; }
1010 bool is_compiling() const { return _is_compiling; }
1011
1012 // Thread chain operations
1013 JavaThread* next() const { return _next; }
1014 void set_next(JavaThread* p) { _next = p; }
1015
1016 // Thread oop. threadObj() can be NULL for initial JavaThread
1017 // (or for threads attached via JNI)
1018 oop threadObj() const { return _threadObj; }
1019 void set_threadObj(oop p) { _threadObj = p; }
1020
1021 ThreadPriority java_priority() const; // Read from threadObj()
1022
1023 // Prepare thread and add to priority queue. If a priority is
1024 // not specified, use the priority of the thread object. Threads_lock
1025 // must be held while this function is called.
1026 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1027
1028 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1029 address saved_exception_pc() { return _saved_exception_pc; }
1030
1031
1032 ThreadFunction entry_point() const { return _entry_point; }
1033
1034 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1035 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1036
1037 // Last frame anchor routines
1038
1039 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1040
1041 // last_Java_sp
1042 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1043 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1044
1045 // last_Java_pc
1046
1047 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1048
1049 // Safepoint support
1050 JavaThreadState thread_state() const { return _thread_state; }
1051 void set_thread_state(JavaThreadState s) { _thread_state=s; }
1052 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1053 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1054 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1055
1056 // thread has called JavaThread::exit() or is terminated
1057 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1058 // thread is terminated (no longer on the threads list); we compare
1059 // against the two non-terminated values so that a freed JavaThread
1060 // will also be considered terminated.
1061 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1062 void set_terminated(TerminatedTypes t) { _terminated = t; }
1063 // special for Threads::remove() which is static:
1064 void set_terminated_value() { _terminated = _thread_terminated; }
1065 void block_if_vm_exited();
1066
1067 bool doing_unsafe_access() { return _doing_unsafe_access; }
1068 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1069
1070 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1071 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1072
1073 #if INCLUDE_NMT
1074 // native memory tracking
1075 inline MemRecorder* get_recorder() const { return (MemRecorder*)_recorder; }
1076 inline void set_recorder(MemRecorder* rc) { _recorder = rc; }
1077
1078 private:
1079 // per-thread memory recorder
1080 MemRecorder* volatile _recorder;
1081 #endif // INCLUDE_NMT
1082
1083 // Suspend/resume support for JavaThread
1084 private:
1085 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1086 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1087
1088 public:
1089 void java_suspend();
1090 void java_resume();
1091 int java_suspend_self();
1092
1093 void check_and_wait_while_suspended() {
1094 assert(JavaThread::current() == this, "sanity check");
1095
1096 bool do_self_suspend;
1097 do {
1098 // were we externally suspended while we were waiting?
1099 do_self_suspend = handle_special_suspend_equivalent_condition();
1100 if (do_self_suspend) {
1101 // don't surprise the thread that suspended us by returning
1102 java_suspend_self();
1103 set_suspend_equivalent();
1104 }
1105 } while (do_self_suspend);
1106 }
1107 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1108 // Check for async exception in addition to safepoint and suspend request.
1109 static void check_special_condition_for_native_trans(JavaThread *thread);
1110
1111 // Same as check_special_condition_for_native_trans but finishes the
1112 // transition into thread_in_Java mode so that it can potentially
1113 // block.
1114 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1115
1116 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1117 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1118 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1119 // Warning: is_ext_suspend_completed() may temporarily drop the
1120 // SR_lock to allow the thread to reach a stable thread state if
1121 // it is currently in a transient thread state.
1122 return is_ext_suspend_completed(false /*!called_by_wait */,
1123 SuspendRetryDelay, bits);
1124 }
1125
1126 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1127 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1128 // passed as the count and delay parameters. Experiments with specific
1129 // calls to wait_for_ext_suspend_completion() can be done by passing
1130 // other values in the code. Experiments with all calls can be done
1131 // via the appropriate -XX options.
1132 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1133
1134 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1135 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1136
1137 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1138 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1139 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1140
1141 bool is_external_suspend() const {
1142 return (_suspend_flags & _external_suspend) != 0;
1143 }
1144 // Whenever a thread transitions from native to vm/java it must suspend
1145 // if external|deopt suspend is present.
1146 bool is_suspend_after_native() const {
1147 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1148 }
1149
1150 // external suspend request is completed
1151 bool is_ext_suspended() const {
1152 return (_suspend_flags & _ext_suspended) != 0;
1153 }
1154
1155 bool is_external_suspend_with_lock() const {
1156 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1157 return is_external_suspend();
1158 }
1159
1160 // Special method to handle a pending external suspend request
1161 // when a suspend equivalent condition lifts.
1162 bool handle_special_suspend_equivalent_condition() {
1163 assert(is_suspend_equivalent(),
1164 "should only be called in a suspend equivalence condition");
1165 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1166 bool ret = is_external_suspend();
1167 if (!ret) {
1168 // not about to self-suspend so clear suspend equivalence
1169 clear_suspend_equivalent();
1170 }
1171 // implied else:
1172 // We have a pending external suspend request so we leave the
1173 // suspend_equivalent flag set until java_suspend_self() sets
1174 // the ext_suspended flag and clears the suspend_equivalent
1175 // flag. This insures that wait_for_ext_suspend_completion()
1176 // will return consistent values.
1177 return ret;
1178 }
1179
1180 // utility methods to see if we are doing some kind of suspension
1181 bool is_being_ext_suspended() const {
1182 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1183 return is_ext_suspended() || is_external_suspend();
1184 }
1185
1186 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1187
1188 void set_suspend_equivalent() { _suspend_equivalent = true; };
1189 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1190
1191 // Thread.stop support
1192 void send_thread_stop(oop throwable);
1193 AsyncRequests clear_special_runtime_exit_condition() {
1194 AsyncRequests x = _special_runtime_exit_condition;
1195 _special_runtime_exit_condition = _no_async_condition;
1196 return x;
1197 }
1198
1199 // Are any async conditions present?
1200 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1201
1202 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1203
1204 // these next two are also used for self-suspension and async exception support
1205 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1206
1207 // Return true if JavaThread has an asynchronous condition or
1208 // if external suspension is requested.
1209 bool has_special_runtime_exit_condition() {
1210 // We call is_external_suspend() last since external suspend should
1211 // be less common. Because we don't use is_external_suspend_with_lock
1212 // it is possible that we won't see an asynchronous external suspend
1213 // request that has just gotten started, i.e., SR_lock grabbed but
1214 // _external_suspend field change either not made yet or not visible
1215 // yet. However, this is okay because the request is asynchronous and
1216 // we will see the new flag value the next time through. It's also
1217 // possible that the external suspend request is dropped after
1218 // we have checked is_external_suspend(), we will recheck its value
1219 // under SR_lock in java_suspend_self().
1220 return (_special_runtime_exit_condition != _no_async_condition) ||
1221 is_external_suspend() || is_deopt_suspend();
1222 }
1223
1224 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1225
1226 void set_pending_async_exception(oop e) {
1227 _pending_async_exception = e;
1228 _special_runtime_exit_condition = _async_exception;
1229 set_has_async_exception();
1230 }
1231
1232 // Fast-locking support
1233 bool is_lock_owned(address adr) const;
1234
1235 // Accessors for vframe array top
1236 // The linked list of vframe arrays are sorted on sp. This means when we
1237 // unpack the head must contain the vframe array to unpack.
1238 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1239 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1240
1241 // Side structure for defering update of java frame locals until deopt occurs
1242 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1243 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1244
1245 // These only really exist to make debugging deopt problems simpler
1246
1247 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1248 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1249
1250 // The special resourceMark used during deoptimization
1251
1252 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1253 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1254
1255 intptr_t* must_deopt_id() { return _must_deopt_id; }
1256 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1257 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1258
1259 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1260 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1261
1262 Method* callee_target() const { return _callee_target; }
1263 void set_callee_target (Method* x) { _callee_target = x; }
1264
1265 // Oop results of vm runtime calls
1266 oop vm_result() const { return _vm_result; }
1267 void set_vm_result (oop x) { _vm_result = x; }
1268
1269 Metadata* vm_result_2() const { return _vm_result_2; }
1270 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1271
1272 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1273 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1274
1275 // Exception handling for compiled methods
1276 oop exception_oop() const { return _exception_oop; }
1277 address exception_pc() const { return _exception_pc; }
1278 address exception_handler_pc() const { return _exception_handler_pc; }
1279 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1280
1281 void set_exception_oop(oop o) { _exception_oop = o; }
1282 void set_exception_pc(address a) { _exception_pc = a; }
1283 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1284 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1285
1286 // Stack overflow support
1287 inline size_t stack_available(address cur_sp);
1288 address stack_yellow_zone_base()
1289 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1290 size_t stack_yellow_zone_size()
1291 { return StackYellowPages * os::vm_page_size(); }
1292 address stack_red_zone_base()
1293 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1294 size_t stack_red_zone_size()
1295 { return StackRedPages * os::vm_page_size(); }
1296 bool in_stack_yellow_zone(address a)
1297 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1298 bool in_stack_red_zone(address a)
1299 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1300
1301 void create_stack_guard_pages();
1302 void remove_stack_guard_pages();
1303
1304 void enable_stack_yellow_zone();
1305 void disable_stack_yellow_zone();
1306 void enable_stack_red_zone();
1307 void disable_stack_red_zone();
1308
1309 inline bool stack_guard_zone_unused();
1310 inline bool stack_yellow_zone_disabled();
1311 inline bool stack_yellow_zone_enabled();
1312
1313 // Attempt to reguard the stack after a stack overflow may have occurred.
1314 // Returns true if (a) guard pages are not needed on this thread, (b) the
1315 // pages are already guarded, or (c) the pages were successfully reguarded.
1316 // Returns false if there is not enough stack space to reguard the pages, in
1317 // which case the caller should unwind a frame and try again. The argument
1318 // should be the caller's (approximate) sp.
1319 bool reguard_stack(address cur_sp);
1320 // Similar to above but see if current stackpoint is out of the guard area
1321 // and reguard if possible.
1322 bool reguard_stack(void);
1323
1324 // Misc. accessors/mutators
1325 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1326 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1327 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1328
1329 #ifndef PRODUCT
1330 void record_jump(address target, address instr, const char* file, int line);
1331 #endif /* PRODUCT */
1332
1333 // For assembly stub generation
1334 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1335 #ifndef PRODUCT
1336 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1337 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1338 #endif /* PRODUCT */
1339 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1340 static ByteSize last_Java_sp_offset() {
1341 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1342 }
1343 static ByteSize last_Java_pc_offset() {
1344 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1345 }
1346 static ByteSize frame_anchor_offset() {
1347 return byte_offset_of(JavaThread, _anchor);
1348 }
1349 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1350 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1351 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1352 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1353 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1354 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1355 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1356 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1357 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1358 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1359 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1360 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1361
1362 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1363 static ByteSize should_post_on_exceptions_flag_offset() {
1364 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1365 }
1366
1367 #if INCLUDE_ALL_GCS
1368 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1369 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1370 #endif // INCLUDE_ALL_GCS
1371
1372 // Returns the jni environment for this thread
1373 JNIEnv* jni_environment() { return &_jni_environment; }
1374
1375 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1376 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1377 // Only return NULL if thread is off the thread list; starting to
1378 // exit should not return NULL.
1379 if (thread_from_jni_env->is_terminated()) {
1380 thread_from_jni_env->block_if_vm_exited();
1381 return NULL;
1382 } else {
1383 return thread_from_jni_env;
1384 }
1385 }
1386
1387 // JNI critical regions. These can nest.
1388 bool in_critical() { return _jni_active_critical > 0; }
1389 bool in_last_critical() { return _jni_active_critical == 1; }
1390 void enter_critical() { assert(Thread::current() == this ||
1391 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1392 "this must be current thread or synchronizing");
1393 _jni_active_critical++; }
1394 void exit_critical() { assert(Thread::current() == this,
1395 "this must be current thread");
1396 _jni_active_critical--;
1397 assert(_jni_active_critical >= 0,
1398 "JNI critical nesting problem?"); }
1399
1400 // For deadlock detection
1401 int depth_first_number() { return _depth_first_number; }
1402 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1403
1404 private:
1405 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1406
1407 public:
1408 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1409 void add_monitor_chunk(MonitorChunk* chunk);
1410 void remove_monitor_chunk(MonitorChunk* chunk);
1411 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1412 void inc_in_deopt_handler() { _in_deopt_handler++; }
1413 void dec_in_deopt_handler() {
1414 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1415 if (_in_deopt_handler > 0) { // robustness
1416 _in_deopt_handler--;
1417 }
1418 }
1419
1420 private:
1421 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1422
1423 public:
1424
1425 // Frame iteration; calls the function f for all frames on the stack
1426 void frames_do(void f(frame*, const RegisterMap*));
1427
1428 // Memory operations
1429 void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1430
1431 // Sweeper operations
1432 void nmethods_do(CodeBlobClosure* cf);
1433
1434 // RedefineClasses Support
1435 void metadata_do(void f(Metadata*));
1436
1437 // Memory management operations
1438 void gc_epilogue();
1439 void gc_prologue();
1440
1441 // Misc. operations
1442 char* name() const { return (char*)get_thread_name(); }
1443 void print_on(outputStream* st) const;
1444 void print() const { print_on(tty); }
1445 void print_value();
1446 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1447 void print_thread_state() const PRODUCT_RETURN;
1448 void print_on_error(outputStream* st, char* buf, int buflen) const;
1449 void verify();
1450 const char* get_thread_name() const;
1451 private:
1452 // factor out low-level mechanics for use in both normal and error cases
1453 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1454 public:
1455 const char* get_threadgroup_name() const;
1456 const char* get_parent_name() const;
1457
1458 // Accessing frames
1459 frame last_frame() {
1460 _anchor.make_walkable(this);
1461 return pd_last_frame();
1462 }
1463 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1464
1465 // Returns method at 'depth' java or native frames down the stack
1466 // Used for security checks
1467 Klass* security_get_caller_class(int depth);
1468
1469 // Print stack trace in external format
1470 void print_stack_on(outputStream* st);
1471 void print_stack() { print_stack_on(tty); }
1472
1473 // Print stack traces in various internal formats
1474 void trace_stack() PRODUCT_RETURN;
1475 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1476 void trace_frames() PRODUCT_RETURN;
1477 void trace_oops() PRODUCT_RETURN;
1478
1479 // Print an annotated view of the stack frames
1480 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1481 void validate_frame_layout() {
1482 print_frame_layout(0, true);
1483 }
1484
1485 // Returns the number of stack frames on the stack
1486 int depth() const;
1487
1488 // Function for testing deoptimization
1489 void deoptimize();
1490 void make_zombies();
1491
1492 void deoptimized_wrt_marked_nmethods();
1493
1494 // Profiling operation (see fprofile.cpp)
1495 public:
1496 bool profile_last_Java_frame(frame* fr);
1497
1498 private:
1499 ThreadProfiler* _thread_profiler;
1500 private:
1501 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1502 friend class FlatProfilerTask; // uses get_thread_profiler.
1503 friend class ThreadProfilerMark; // uses get_thread_profiler.
1504 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1505 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1506 ThreadProfiler* result = _thread_profiler;
1507 _thread_profiler = tp;
1508 return result;
1509 }
1510
1511 // NMT (Native memory tracking) support.
1512 // This flag helps NMT to determine if this JavaThread will be blocked
1513 // at safepoint. If not, ThreadCritical is needed for writing memory records.
1514 // JavaThread is only safepoint visible when it is in Threads' thread list,
1515 // it is not visible until it is added to the list and becomes invisible
1516 // once it is removed from the list.
1517 public:
1518 bool is_safepoint_visible() const { return _safepoint_visible; }
1519 void set_safepoint_visible(bool visible) { _safepoint_visible = visible; }
1520 private:
1521 bool _safepoint_visible;
1522
1523 // Static operations
1524 public:
1525 // Returns the running thread as a JavaThread
1526 static inline JavaThread* current();
1527
1528 // Returns the active Java thread. Do not use this if you know you are calling
1529 // from a JavaThread, as it's slower than JavaThread::current. If called from
1530 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1531 // operation. You may not want that either.
1532 static JavaThread* active();
1533
1534 inline CompilerThread* as_CompilerThread();
1535
1536 public:
1537 virtual void run();
1538 void thread_main_inner();
1539
1540 private:
1541 // PRIVILEGED STACK
1542 PrivilegedElement* _privileged_stack_top;
1543 GrowableArray<oop>* _array_for_gc;
1544 public:
1545
1546 // Returns the privileged_stack information.
1547 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1548 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1549 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1550
1551 public:
1552 // Thread local information maintained by JVMTI.
1553 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1554 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1555 // getter is used to get this JavaThread's JvmtiThreadState if it has
1556 // one which means NULL can be returned. JvmtiThreadState::state_for()
1557 // is used to get the specified JavaThread's JvmtiThreadState if it has
1558 // one or it allocates a new JvmtiThreadState for the JavaThread and
1559 // returns it. JvmtiThreadState::state_for() will return NULL only if
1560 // the specified JavaThread is exiting.
1561 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1562 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1563 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1564 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1565
1566 // JVMTI PopFrame support
1567 // Setting and clearing popframe_condition
1568 // All of these enumerated values are bits. popframe_pending
1569 // indicates that a PopFrame() has been requested and not yet been
1570 // completed. popframe_processing indicates that that PopFrame() is in
1571 // the process of being completed. popframe_force_deopt_reexecution_bit
1572 // indicates that special handling is required when returning to a
1573 // deoptimized caller.
1574 enum PopCondition {
1575 popframe_inactive = 0x00,
1576 popframe_pending_bit = 0x01,
1577 popframe_processing_bit = 0x02,
1578 popframe_force_deopt_reexecution_bit = 0x04
1579 };
1580 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1581 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1582 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1583 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1584 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1585 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1586 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1587 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1588 #ifdef CC_INTERP
1589 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1590 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1591 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1592 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1593 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1594 #endif
1595
1596 private:
1597 // Saved incoming arguments to popped frame.
1598 // Used only when popped interpreted frame returns to deoptimized frame.
1599 void* _popframe_preserved_args;
1600 int _popframe_preserved_args_size;
1601
1602 public:
1603 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1604 void* popframe_preserved_args();
1605 ByteSize popframe_preserved_args_size();
1606 WordSize popframe_preserved_args_size_in_words();
1607 void popframe_free_preserved_args();
1608
1609
1610 private:
1611 JvmtiThreadState *_jvmti_thread_state;
1612 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1613
1614 // Used by the interpreter in fullspeed mode for frame pop, method
1615 // entry, method exit and single stepping support. This field is
1616 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1617 // It can be set to zero asynchronously (i.e., without a VM operation
1618 // or a lock) so we have to be very careful.
1619 int _interp_only_mode;
1620
1621 public:
1622 // used by the interpreter for fullspeed debugging support (see above)
1623 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1624 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1625 int get_interp_only_mode() { return _interp_only_mode; }
1626 void increment_interp_only_mode() { ++_interp_only_mode; }
1627 void decrement_interp_only_mode() { --_interp_only_mode; }
1628
1629 // support for cached flag that indicates whether exceptions need to be posted for this thread
1630 // if this is false, we can avoid deoptimizing when events are thrown
1631 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1632 private:
1633 int _should_post_on_exceptions_flag;
1634
1635 public:
1636 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1637 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1638
1639 private:
1640 ThreadStatistics *_thread_stat;
1641
1642 public:
1643 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1644
1645 // Return a blocker object for which this thread is blocked parking.
1646 oop current_park_blocker();
1647
1648 private:
1649 static size_t _stack_size_at_create;
1650
1651 public:
1652 static inline size_t stack_size_at_create(void) {
1653 return _stack_size_at_create;
1654 }
1655 static inline void set_stack_size_at_create(size_t value) {
1656 _stack_size_at_create = value;
1657 }
1658
1659 #if INCLUDE_ALL_GCS
1660 // SATB marking queue support
1661 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1662 static SATBMarkQueueSet& satb_mark_queue_set() {
1663 return _satb_mark_queue_set;
1664 }
1665
1666 // Dirty card queue support
1667 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1668 static DirtyCardQueueSet& dirty_card_queue_set() {
1669 return _dirty_card_queue_set;
1670 }
1671 #endif // INCLUDE_ALL_GCS
1672
1673 // This method initializes the SATB and dirty card queues before a
1674 // JavaThread is added to the Java thread list. Right now, we don't
1675 // have to do anything to the dirty card queue (it should have been
1676 // activated when the thread was created), but we have to activate
1677 // the SATB queue if the thread is created while a marking cycle is
1678 // in progress. The activation / de-activation of the SATB queues at
1679 // the beginning / end of a marking cycle is done during safepoints
1680 // so we have to make sure this method is called outside one to be
1681 // able to safely read the active field of the SATB queue set. Right
1682 // now, it is called just before the thread is added to the Java
1683 // thread list in the Threads::add() method. That method is holding
1684 // the Threads_lock which ensures we are outside a safepoint. We
1685 // cannot do the obvious and set the active field of the SATB queue
1686 // when the thread is created given that, in some cases, safepoints
1687 // might happen between the JavaThread constructor being called and the
1688 // thread being added to the Java thread list (an example of this is
1689 // when the structure for the DestroyJavaVM thread is created).
1690 #if INCLUDE_ALL_GCS
1691 void initialize_queues();
1692 #else // INCLUDE_ALL_GCS
1693 void initialize_queues() { }
1694 #endif // INCLUDE_ALL_GCS
1695
1696 // Machine dependent stuff
1697 #ifdef TARGET_OS_ARCH_linux_x86
1698 # include "thread_linux_x86.hpp"
1699 #endif
1700 #ifdef TARGET_OS_ARCH_linux_sparc
1701 # include "thread_linux_sparc.hpp"
1702 #endif
1703 #ifdef TARGET_OS_ARCH_linux_zero
1704 # include "thread_linux_zero.hpp"
1705 #endif
1706 #ifdef TARGET_OS_ARCH_solaris_x86
1707 # include "thread_solaris_x86.hpp"
1708 #endif
1709 #ifdef TARGET_OS_ARCH_solaris_sparc
1710 # include "thread_solaris_sparc.hpp"
1711 #endif
1712 #ifdef TARGET_OS_ARCH_windows_x86
1713 # include "thread_windows_x86.hpp"
1714 #endif
1715 #ifdef TARGET_OS_ARCH_linux_arm
1716 # include "thread_linux_arm.hpp"
1717 #endif
1718 #ifdef TARGET_OS_ARCH_linux_ppc
1719 # include "thread_linux_ppc.hpp"
1720 #endif
1721 #ifdef TARGET_OS_ARCH_bsd_x86
1722 # include "thread_bsd_x86.hpp"
1723 #endif
1724 #ifdef TARGET_OS_ARCH_bsd_zero
1725 # include "thread_bsd_zero.hpp"
1726 #endif
1727
1728
1729 public:
1730 void set_blocked_on_compilation(bool value) {
1731 _blocked_on_compilation = value;
1732 }
1733
1734 bool blocked_on_compilation() {
1735 return _blocked_on_compilation;
1736 }
1737 protected:
1738 bool _blocked_on_compilation;
1739
1740
1741 // JSR166 per-thread parker
1742 private:
1743 Parker* _parker;
1744 public:
1745 Parker* parker() { return _parker; }
1746
1747 // Biased locking support
1748 private:
1749 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1750 public:
1751 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1752 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1753
1754 // clearing/querying jni attach status
1755 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1756 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1757 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); }
1758 private:
1759 // This field is used to determine if a thread has claimed
1760 // a par_id: it is -1 if the thread has not claimed a par_id;
1761 // otherwise its value is the par_id that has been claimed.
1762 int _claimed_par_id;
1763 public:
1764 int get_claimed_par_id() { return _claimed_par_id; }
1765 void set_claimed_par_id(int id) { _claimed_par_id = id;}
1766 };
1767
1768 // Inline implementation of JavaThread::current
1769 inline JavaThread* JavaThread::current() {
1770 Thread* thread = ThreadLocalStorage::thread();
1771 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1772 return (JavaThread*)thread;
1773 }
1774
1775 inline CompilerThread* JavaThread::as_CompilerThread() {
1776 assert(is_Compiler_thread(), "just checking");
1777 return (CompilerThread*)this;
1778 }
1779
1780 inline bool JavaThread::stack_guard_zone_unused() {
1781 return _stack_guard_state == stack_guard_unused;
1782 }
1783
1784 inline bool JavaThread::stack_yellow_zone_disabled() {
1785 return _stack_guard_state == stack_guard_yellow_disabled;
1786 }
1787
1788 inline bool JavaThread::stack_yellow_zone_enabled() {
1789 #ifdef ASSERT
1790 if (os::uses_stack_guard_pages()) {
1791 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1792 }
1793 #endif
1794 return _stack_guard_state == stack_guard_enabled;
1795 }
1796
1797 inline size_t JavaThread::stack_available(address cur_sp) {
1798 // This code assumes java stacks grow down
1799 address low_addr; // Limit on the address for deepest stack depth
1800 if ( _stack_guard_state == stack_guard_unused) {
1801 low_addr = stack_base() - stack_size();
1802 } else {
1803 low_addr = stack_yellow_zone_base();
1804 }
1805 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1806 }
1807
1808 // A thread used for Compilation.
1809 class CompilerThread : public JavaThread {
1810 friend class VMStructs;
1811 private:
1812 CompilerCounters* _counters;
1813
1814 ciEnv* _env;
1815 CompileLog* _log;
1816 CompileTask* _task;
1817 CompileQueue* _queue;
1818 BufferBlob* _buffer_blob;
1819
1820 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1821
1822 public:
1823
1824 static CompilerThread* current();
1825
1826 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1827
1828 bool is_Compiler_thread() const { return true; }
1829 // Hide this compiler thread from external view.
1830 bool is_hidden_from_external_view() const { return true; }
1831
1832 CompileQueue* queue() { return _queue; }
1833 CompilerCounters* counters() { return _counters; }
1834
1835 // Get/set the thread's compilation environment.
1836 ciEnv* env() { return _env; }
1837 void set_env(ciEnv* env) { _env = env; }
1838
1839 BufferBlob* get_buffer_blob() { return _buffer_blob; }
1840 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1841
1842 // Get/set the thread's logging information
1843 CompileLog* log() { return _log; }
1844 void init_log(CompileLog* log) {
1845 // Set once, for good.
1846 assert(_log == NULL, "set only once");
1847 _log = log;
1848 }
1849
1850 // GC support
1851 // Apply "f->do_oop" to all root oops in "this".
1852 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1853 void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1854
1855 #ifndef PRODUCT
1856 private:
1857 IdealGraphPrinter *_ideal_graph_printer;
1858 public:
1859 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1860 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1861 #endif
1862
1863 // Get/set the thread's current task
1864 CompileTask* task() { return _task; }
1865 void set_task(CompileTask* task) { _task = task; }
1866
1867 // Track the nmethod currently being scanned by the sweeper
1868 void set_scanned_nmethod(nmethod* nm) {
1869 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1870 _scanned_nmethod = nm;
1871 }
1872 };
1873
1874 inline CompilerThread* CompilerThread::current() {
1875 return JavaThread::current()->as_CompilerThread();
1876 }
1877
1878
1879 // The active thread queue. It also keeps track of the current used
1880 // thread priorities.
1881 class Threads: AllStatic {
1882 friend class VMStructs;
1883 private:
1884 static JavaThread* _thread_list;
1885 static int _number_of_threads;
1886 static int _number_of_non_daemon_threads;
1887 static int _return_code;
1888 #ifdef ASSERT
1889 static bool _vm_complete;
1890 #endif
1891
1892 public:
1893 // Thread management
1894 // force_daemon is a concession to JNI, where we may need to add a
1895 // thread to the thread list before allocating its thread object
1896 static void add(JavaThread* p, bool force_daemon = false);
1897 static void remove(JavaThread* p);
1898 static bool includes(JavaThread* p);
1899 static JavaThread* first() { return _thread_list; }
1900 static void threads_do(ThreadClosure* tc);
1901
1902 // Initializes the vm and creates the vm thread
1903 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1904 static void convert_vm_init_libraries_to_agents();
1905 static void create_vm_init_libraries();
1906 static void create_vm_init_agents();
1907 static void shutdown_vm_agents();
1908 static bool destroy_vm();
1909 // Supported VM versions via JNI
1910 // Includes JNI_VERSION_1_1
1911 static jboolean is_supported_jni_version_including_1_1(jint version);
1912 // Does not include JNI_VERSION_1_1
1913 static jboolean is_supported_jni_version(jint version);
1914
1915 // Garbage collection
1916 static void follow_other_roots(void f(oop*));
1917
1918 // Apply "f->do_oop" to all root oops in all threads.
1919 // This version may only be called by sequential code.
1920 static void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1921 // This version may be called by sequential or parallel code.
1922 static void possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1923 // This creates a list of GCTasks, one per thread.
1924 static void create_thread_roots_tasks(GCTaskQueue* q);
1925 // This creates a list of GCTasks, one per thread, for marking objects.
1926 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1927
1928 // Apply "f->do_oop" to roots in all threads that
1929 // are part of compiled frames
1930 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1931
1932 static void convert_hcode_pointers();
1933 static void restore_hcode_pointers();
1934
1935 // Sweeper
1936 static void nmethods_do(CodeBlobClosure* cf);
1937
1938 // RedefineClasses support
1939 static void metadata_do(void f(Metadata*));
1940
1941 static void gc_epilogue();
1942 static void gc_prologue();
1943 #ifdef ASSERT
1944 static bool is_vm_complete() { return _vm_complete; }
1945 #endif
1946
1947 // Verification
1948 static void verify();
1949 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1950 static void print(bool print_stacks, bool internal_format) {
1951 // this function is only used by debug.cpp
1952 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1953 }
1954 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1955
1956 // Get Java threads that are waiting to enter a monitor. If doLock
1957 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1958 // VM needs to be at a safepoint.
1959 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1960 address monitor, bool doLock);
1961
1962 // Get owning Java thread from the monitor's owner field. If doLock
1963 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1964 // VM needs to be at a safepoint.
1965 static JavaThread *owning_thread_from_monitor_owner(address owner,
1966 bool doLock);
1967
1968 // Number of threads on the active threads list
1969 static int number_of_threads() { return _number_of_threads; }
1970 // Number of non-daemon threads on the active threads list
1971 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1972
1973 // Deoptimizes all frames tied to marked nmethods
1974 static void deoptimized_wrt_marked_nmethods();
1975
1976 };
1977
1978
1979 // Thread iterator
1980 class ThreadClosure: public StackObj {
1981 public:
1982 virtual void do_thread(Thread* thread) = 0;
1983 };
1984
1985 class SignalHandlerMark: public StackObj {
1986 private:
1987 Thread* _thread;
1988 public:
1989 SignalHandlerMark(Thread* t) {
1990 _thread = t;
1991 if (_thread) _thread->enter_signal_handler();
1992 }
1993 ~SignalHandlerMark() {
1994 if (_thread) _thread->leave_signal_handler();
1995 _thread = NULL;
1996 }
1997 };
1998
1999
2000 #endif // SHARE_VM_RUNTIME_THREAD_HPP