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