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