1 /*
2 * Copyright (c) 1997, 2012, 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
45 #if INCLUDE_NMT
46 #include "services/memRecorder.hpp"
47 #endif // INCLUDE_NMT
48
49 #include "trace/tracing.hpp"
50 #include "utilities/exceptions.hpp"
51 #include "utilities/top.hpp"
52 #ifndef SERIALGC
53 #include "gc_implementation/g1/dirtyCardQueue.hpp"
54 #include "gc_implementation/g1/satbQueue.hpp"
55 #endif
56 #ifdef ZERO
57 #ifdef TARGET_ARCH_zero
58 # include "stack_zero.hpp"
59 #endif
60 #endif
61
62 class ThreadSafepointState;
63 class ThreadProfiler;
64
65 class JvmtiThreadState;
66 class JvmtiGetLoadedClassesClosure;
67 class ThreadStatistics;
68 class ConcurrentLocksDump;
69 class ParkEvent;
70 class Parker;
71
72 class ciEnv;
73 class CompileThread;
74 class CompileLog;
75 class CompileTask;
76 class CompileQueue;
77 class CompilerCounters;
78 class vframeArray;
79
80 class DeoptResourceMark;
81 class jvmtiDeferredLocalVariableSet;
82
83 class GCTaskQueue;
84 class ThreadClosure;
85 class IdealGraphPrinter;
86
87 class WorkerThread;
88
89 // Class hierarchy
90 // - Thread
91 // - NamedThread
92 // - VMThread
93 // - ConcurrentGCThread
94 // - WorkerThread
95 // - GangWorker
96 // - GCTaskThread
97 // - JavaThread
98 // - WatcherThread
99
100 class Thread: public ThreadShadow {
101 friend class VMStructs;
102 private:
103 // Exception handling
104 // (Note: _pending_exception and friends are in ThreadShadow)
105 //oop _pending_exception; // pending exception for current thread
106 // const char* _exception_file; // file information for exception (debugging only)
107 // int _exception_line; // line information for exception (debugging only)
108 protected:
109 // Support for forcing alignment of thread objects for biased locking
110 void* _real_malloc_address;
111 public:
112 void* operator new(size_t size) { return allocate(size, true); }
113 void* operator new(size_t size, std::nothrow_t& nothrow_constant) { return allocate(size, false); }
114 void operator delete(void* p);
115
116 protected:
117 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
118 private:
119
120 // ***************************************************************
121 // Suspend and resume support
122 // ***************************************************************
123 //
124 // VM suspend/resume no longer exists - it was once used for various
125 // things including safepoints but was deprecated and finally removed
126 // in Java 7. Because VM suspension was considered "internal" Java-level
127 // suspension was considered "external", and this legacy naming scheme
128 // remains.
129 //
130 // External suspend/resume requests come from JVM_SuspendThread,
131 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
132 // ResumeThread. External
133 // suspend requests cause _external_suspend to be set and external
134 // resume requests cause _external_suspend to be cleared.
135 // External suspend requests do not nest on top of other external
136 // suspend requests. The higher level APIs reject suspend requests
137 // for already suspended threads.
138 //
139 // The external_suspend
140 // flag is checked by has_special_runtime_exit_condition() and java thread
141 // will self-suspend when handle_special_runtime_exit_condition() is
142 // called. Most uses of the _thread_blocked state in JavaThreads are
143 // considered the same as being externally suspended; if the blocking
144 // condition lifts, the JavaThread will self-suspend. Other places
145 // where VM checks for external_suspend include:
146 // + mutex granting (do not enter monitors when thread is suspended)
147 // + state transitions from _thread_in_native
148 //
149 // In general, java_suspend() does not wait for an external suspend
150 // request to complete. When it returns, the only guarantee is that
151 // the _external_suspend field is true.
152 //
153 // wait_for_ext_suspend_completion() is used to wait for an external
154 // suspend request to complete. External suspend requests are usually
155 // followed by some other interface call that requires the thread to
156 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
157 // the interface that requires quiescence, we give the JavaThread a
158 // chance to self-suspend before we need it to be quiescent. This
159 // improves overall suspend/query performance.
160 //
161 // _suspend_flags controls the behavior of java_ suspend/resume.
162 // It must be set under the protection of SR_lock. Read from the flag is
163 // OK without SR_lock as long as the value is only used as a hint.
164 // (e.g., check _external_suspend first without lock and then recheck
165 // inside SR_lock and finish the suspension)
166 //
167 // _suspend_flags is also overloaded for other "special conditions" so
168 // that a single check indicates whether any special action is needed
169 // eg. for async exceptions.
170 // -------------------------------------------------------------------
171 // Notes:
172 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
173 // but we still update its value to keep other part of the system (mainly
174 // JVMTI) happy. ThreadState is legacy code (see notes in
175 // osThread.hpp).
176 //
177 // 2. It would be more natural if set_external_suspend() is private and
178 // part of java_suspend(), but that probably would affect the suspend/query
179 // performance. Need more investigation on this.
180 //
181
182 // suspend/resume lock: used for self-suspend
183 Monitor* _SR_lock;
184
185 protected:
186 enum SuspendFlags {
187 // NOTE: avoid using the sign-bit as cc generates different test code
188 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
189
190 _external_suspend = 0x20000000U, // thread is asked to self suspend
191 _ext_suspended = 0x40000000U, // thread has self-suspended
192 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
193
194 _has_async_exception = 0x00000001U, // there is a pending async exception
195 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
196 };
197
198 // various suspension related flags - atomically updated
199 // overloaded for async exception checking in check_special_condition_for_native_trans.
200 volatile uint32_t _suspend_flags;
201
202 private:
203 int _num_nested_signal;
204
205 public:
206 void enter_signal_handler() { _num_nested_signal++; }
207 void leave_signal_handler() { _num_nested_signal--; }
208 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
209
210 private:
211 // Debug tracing
212 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
213
214 // Active_handles points to a block of handles
215 JNIHandleBlock* _active_handles;
216
217 // One-element thread local free list
218 JNIHandleBlock* _free_handle_block;
219
220 // Point to the last handle mark
221 HandleMark* _last_handle_mark;
222
223 // The parity of the last strong_roots iteration in which this thread was
224 // claimed as a task.
225 jint _oops_do_parity;
226
227 public:
228 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
229 HandleMark* last_handle_mark() const { return _last_handle_mark; }
230 private:
231
232 // debug support for checking if code does allow safepoints or not
233 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
234 // mutex, or blocking on an object synchronizer (Java locking).
235 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
236 // If !allow_allocation(), then an assertion failure will happen during allocation
237 // (Hence, !allow_safepoint() => !allow_allocation()).
238 //
239 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
240 //
241 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
242 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
243
244 // Used by SkipGCALot class.
245 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
246
247 // Record when GC is locked out via the GC_locker mechanism
248 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
249
250 friend class No_Alloc_Verifier;
251 friend class No_Safepoint_Verifier;
252 friend class Pause_No_Safepoint_Verifier;
253 friend class ThreadLocalStorage;
254 friend class GC_locker;
255
256 ThreadLocalAllocBuffer _tlab; // Thread-local eden
257 jlong _allocated_bytes; // Cumulative number of bytes allocated on
258 // the Java heap
259
260 TRACE_BUFFER _trace_buffer; // Thread-local buffer for tracing
261
262 int _vm_operation_started_count; // VM_Operation support
263 int _vm_operation_completed_count; // VM_Operation support
264
265 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
266 // is waiting to lock
267 bool _current_pending_monitor_is_from_java; // locking is from Java code
268
269 // ObjectMonitor on which this thread called Object.wait()
270 ObjectMonitor* _current_waiting_monitor;
271
272 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
273 public:
274 ObjectMonitor* omFreeList;
275 int omFreeCount; // length of omFreeList
276 int omFreeProvision; // reload chunk size
277 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
278 int omInUseCount; // length of omInUseList
279
280 #ifdef ASSERT
281 private:
282 bool _visited_for_critical_count;
283
284 public:
285 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
286 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
287 #endif
288
289 public:
290 enum {
291 is_definitely_current_thread = true
292 };
293
294 // Constructor
295 Thread();
296 virtual ~Thread();
297
298 // initializtion
299 void initialize_thread_local_storage();
300
301 // thread entry point
302 virtual void run();
303
304 // Testers
305 virtual bool is_VM_thread() const { return false; }
306 virtual bool is_Java_thread() const { return false; }
307 virtual bool is_Compiler_thread() const { return false; }
308 virtual bool is_hidden_from_external_view() const { return false; }
309 virtual bool is_jvmti_agent_thread() const { return false; }
310 // True iff the thread can perform GC operations at a safepoint.
311 // Generally will be true only of VM thread and parallel GC WorkGang
312 // threads.
313 virtual bool is_GC_task_thread() const { return false; }
314 virtual bool is_Watcher_thread() const { return false; }
315 virtual bool is_ConcurrentGC_thread() const { return false; }
316 virtual bool is_Named_thread() const { return false; }
317 virtual bool is_Worker_thread() const { return false; }
318
319 // Casts
320 virtual WorkerThread* as_Worker_thread() const { return NULL; }
321
322 virtual char* name() const { return (char*)"Unknown thread"; }
323
324 // Returns the current thread
325 static inline Thread* current();
326
327 // Common thread operations
328 static void set_priority(Thread* thread, ThreadPriority priority);
329 static ThreadPriority get_priority(const Thread* const thread);
330 static void start(Thread* thread);
331 static void interrupt(Thread* thr);
332 static bool is_interrupted(Thread* thr, bool clear_interrupted);
333
334 void set_native_thread_name(const char *name) {
335 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
336 os::set_native_thread_name(name);
337 }
338
339 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
340 Monitor* SR_lock() const { return _SR_lock; }
341
342 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
343
344 void set_suspend_flag(SuspendFlags f) {
345 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
346 uint32_t flags;
347 do {
348 flags = _suspend_flags;
349 }
350 while (Atomic::cmpxchg((jint)(flags | f),
351 (volatile jint*)&_suspend_flags,
352 (jint)flags) != (jint)flags);
353 }
354 void clear_suspend_flag(SuspendFlags f) {
355 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
356 uint32_t flags;
357 do {
358 flags = _suspend_flags;
359 }
360 while (Atomic::cmpxchg((jint)(flags & ~f),
361 (volatile jint*)&_suspend_flags,
362 (jint)flags) != (jint)flags);
363 }
364
365 void set_has_async_exception() {
366 set_suspend_flag(_has_async_exception);
367 }
368 void clear_has_async_exception() {
369 clear_suspend_flag(_has_async_exception);
370 }
371
372 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
373
374 void set_critical_native_unlock() {
375 set_suspend_flag(_critical_native_unlock);
376 }
377 void clear_critical_native_unlock() {
378 clear_suspend_flag(_critical_native_unlock);
379 }
380
381 // Support for Unhandled Oop detection
382 #ifdef CHECK_UNHANDLED_OOPS
383 private:
384 UnhandledOops* _unhandled_oops;
385 public:
386 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
387 // Mark oop safe for gc. It may be stack allocated but won't move.
388 void allow_unhandled_oop(oop *op) {
389 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
390 }
391 // Clear oops at safepoint so crashes point to unhandled oop violator
392 void clear_unhandled_oops() {
393 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
394 }
395 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
396 #endif // CHECK_UNHANDLED_OOPS
397
398 #ifndef PRODUCT
399 bool skip_gcalot() { return _skip_gcalot; }
400 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
401 #endif
402
403 public:
404 // Installs a pending exception to be inserted later
405 static void send_async_exception(oop thread_oop, oop java_throwable);
406
407 // Resource area
408 ResourceArea* resource_area() const { return _resource_area; }
409 void set_resource_area(ResourceArea* area) { _resource_area = area; }
410
411 OSThread* osthread() const { return _osthread; }
412 void set_osthread(OSThread* thread) { _osthread = thread; }
413
414 // JNI handle support
415 JNIHandleBlock* active_handles() const { return _active_handles; }
416 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
417 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
418 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
419
420 // Internal handle support
421 HandleArea* handle_area() const { return _handle_area; }
422 void set_handle_area(HandleArea* area) { _handle_area = area; }
423
424 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
425 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
426
427 // Thread-Local Allocation Buffer (TLAB) support
428 ThreadLocalAllocBuffer& tlab() { return _tlab; }
429 void initialize_tlab() {
430 if (UseTLAB) {
431 tlab().initialize();
432 }
433 }
434
435 jlong allocated_bytes() { return _allocated_bytes; }
436 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
437 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
438 jlong cooked_allocated_bytes() {
439 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
440 if (UseTLAB) {
441 size_t used_bytes = tlab().used_bytes();
442 if ((ssize_t)used_bytes > 0) {
443 // More-or-less valid tlab. The load_acquire above should ensure
444 // that the result of the add is <= the instantaneous value
445 return allocated_bytes + used_bytes;
446 }
447 }
448 return allocated_bytes;
449 }
450
451 TRACE_BUFFER trace_buffer() { return _trace_buffer; }
452 void set_trace_buffer(TRACE_BUFFER buf) { _trace_buffer = buf; }
453
454 // VM operation support
455 int vm_operation_ticket() { return ++_vm_operation_started_count; }
456 int vm_operation_completed_count() { return _vm_operation_completed_count; }
457 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
458
459 // For tracking the heavyweight monitor the thread is pending on.
460 ObjectMonitor* current_pending_monitor() {
461 return _current_pending_monitor;
462 }
463 void set_current_pending_monitor(ObjectMonitor* monitor) {
464 _current_pending_monitor = monitor;
465 }
466 void set_current_pending_monitor_is_from_java(bool from_java) {
467 _current_pending_monitor_is_from_java = from_java;
468 }
469 bool current_pending_monitor_is_from_java() {
470 return _current_pending_monitor_is_from_java;
471 }
472
473 // For tracking the ObjectMonitor on which this thread called Object.wait()
474 ObjectMonitor* current_waiting_monitor() {
475 return _current_waiting_monitor;
476 }
477 void set_current_waiting_monitor(ObjectMonitor* monitor) {
478 _current_waiting_monitor = monitor;
479 }
480
481 // GC support
482 // Apply "f->do_oop" to all root oops in "this".
483 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
484 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf);
485
486 // Handles the parallel case for the method below.
487 private:
488 bool claim_oops_do_par_case(int collection_parity);
489 public:
490 // Requires that "collection_parity" is that of the current strong roots
491 // iteration. If "is_par" is false, sets the parity of "this" to
492 // "collection_parity", and returns "true". If "is_par" is true,
493 // uses an atomic instruction to set the current threads parity to
494 // "collection_parity", if it is not already. Returns "true" iff the
495 // calling thread does the update, this indicates that the calling thread
496 // has claimed the thread's stack as a root groop in the current
497 // collection.
498 bool claim_oops_do(bool is_par, int collection_parity) {
499 if (!is_par) {
500 _oops_do_parity = collection_parity;
501 return true;
502 } else {
503 return claim_oops_do_par_case(collection_parity);
504 }
505 }
506
507 // Sweeper support
508 void nmethods_do(CodeBlobClosure* cf);
509
510 // jvmtiRedefineClasses support
511 void metadata_do(void f(Metadata*));
512
513 // Used by fast lock support
514 virtual bool is_lock_owned(address adr) const;
515
516 // Check if address is in the stack of the thread (not just for locks).
517 // Warning: the method can only be used on the running thread
518 bool is_in_stack(address adr) const;
519
520 // Sets this thread as starting thread. Returns failure if thread
521 // creation fails due to lack of memory, too many threads etc.
522 bool set_as_starting_thread();
523
524 protected:
525 // OS data associated with the thread
526 OSThread* _osthread; // Platform-specific thread information
527
528 // Thread local resource area for temporary allocation within the VM
529 ResourceArea* _resource_area;
530
531 // Thread local handle area for allocation of handles within the VM
532 HandleArea* _handle_area;
533 GrowableArray<Metadata*>* _metadata_handles;
534
535 // Support for stack overflow handling, get_thread, etc.
536 address _stack_base;
537 size_t _stack_size;
538 uintptr_t _self_raw_id; // used by get_thread (mutable)
539 int _lgrp_id;
540
541 public:
542 // Stack overflow support
543 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
544
545 void set_stack_base(address base) { _stack_base = base; }
546 size_t stack_size() const { return _stack_size; }
547 void set_stack_size(size_t size) { _stack_size = size; }
548 void record_stack_base_and_size();
549
550 bool on_local_stack(address adr) const {
551 /* QQQ this has knowledge of direction, ought to be a stack method */
552 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
553 }
554
555 uintptr_t self_raw_id() { return _self_raw_id; }
556 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
557
558 int lgrp_id() const { return _lgrp_id; }
559 void set_lgrp_id(int value) { _lgrp_id = value; }
560
561 // Printing
562 void print_on(outputStream* st) const;
563 void print() const { print_on(tty); }
564 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
565
566 // Debug-only code
567 #ifdef ASSERT
568 private:
569 // Deadlock detection support for Mutex locks. List of locks own by thread.
570 Monitor* _owned_locks;
571 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
572 // thus the friendship
573 friend class Mutex;
574 friend class Monitor;
575
576 public:
577 void print_owned_locks_on(outputStream* st) const;
578 void print_owned_locks() const { print_owned_locks_on(tty); }
579 Monitor* owned_locks() const { return _owned_locks; }
580 bool owns_locks() const { return owned_locks() != NULL; }
581 bool owns_locks_but_compiled_lock() const;
582
583 // Deadlock detection
584 bool allow_allocation() { return _allow_allocation_count == 0; }
585 #endif
586
587 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
588
589 private:
590 volatile int _jvmti_env_iteration_count;
591
592 public:
593 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
594 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
595 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
596
597 // Code generation
598 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
599 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
600 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
601
602 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
603 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
604
605 #define TLAB_FIELD_OFFSET(name) \
606 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
607
608 TLAB_FIELD_OFFSET(start)
609 TLAB_FIELD_OFFSET(end)
610 TLAB_FIELD_OFFSET(top)
611 TLAB_FIELD_OFFSET(pf_top)
612 TLAB_FIELD_OFFSET(size) // desired_size
613 TLAB_FIELD_OFFSET(refill_waste_limit)
614 TLAB_FIELD_OFFSET(number_of_refills)
615 TLAB_FIELD_OFFSET(fast_refill_waste)
616 TLAB_FIELD_OFFSET(slow_allocations)
617
618 #undef TLAB_FIELD_OFFSET
619
620 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
621
622 public:
623 volatile intptr_t _Stalled ;
624 volatile int _TypeTag ;
625 ParkEvent * _ParkEvent ; // for synchronized()
626 ParkEvent * _SleepEvent ; // for Thread.sleep
627 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
628 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
629 int NativeSyncRecursion ; // diagnostic
630
631 volatile int _OnTrap ; // Resume-at IP delta
632 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
633 jint _hashStateX ; // thread-specific hashCode generator state
634 jint _hashStateY ;
635 jint _hashStateZ ;
636 void * _schedctl ;
637
638 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code
639 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); }
640 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); }
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 volatile static bool _should_terminate; // updated without holding lock
726 public:
727 enum SomeConstants {
728 delay_interval = 10 // interrupt delay in milliseconds
729 };
730
731 // Constructor
732 WatcherThread();
733
734 // Tester
735 bool is_Watcher_thread() const { return true; }
736
737 // Printing
738 char* name() const { return (char*)"VM Periodic Task Thread"; }
739 void print_on(outputStream* st) const;
740 void print() const { print_on(tty); }
741
742 // Returns the single instance of WatcherThread
743 static WatcherThread* watcher_thread() { return _watcher_thread; }
744
745 // Create and start the single instance of WatcherThread, or stop it on shutdown
746 static void start();
747 static void stop();
748 };
749
750
751 class CompilerThread;
752
753 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
754
755 class JavaThread: public Thread {
756 friend class VMStructs;
757 private:
758 JavaThread* _next; // The next thread in the Threads list
759 oop _threadObj; // The Java level thread object
760
761 #ifdef ASSERT
762 private:
763 int _java_call_counter;
764
765 public:
766 int java_call_counter() { return _java_call_counter; }
767 void inc_java_call_counter() { _java_call_counter++; }
768 void dec_java_call_counter() {
769 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
770 _java_call_counter--;
771 }
772 private: // restore original namespace restriction
773 #endif // ifdef ASSERT
774
775 #ifndef PRODUCT
776 public:
777 enum {
778 jump_ring_buffer_size = 16
779 };
780 private: // restore original namespace restriction
781 #endif
782
783 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
784
785 ThreadFunction _entry_point;
786
787 JNIEnv _jni_environment;
788
789 // Deopt support
790 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
791
792 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
793 // transition out of native
794 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
795 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
796 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
797 // Because deoptimization is lazy we must save jvmti requests to set locals
798 // in compiled frames until we deoptimize and we have an interpreter frame.
799 // This holds the pointer to array (yeah like there might be more than one) of
800 // description of compiled vframes that have locals that need to be updated.
801 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
802
803 // Handshake value for fixing 6243940. We need a place for the i2c
804 // adapter to store the callee Method*. This value is NEVER live
805 // across a gc point so it does NOT have to be gc'd
806 // The handshake is open ended since we can't be certain that it will
807 // be NULLed. This is because we rarely ever see the race and end up
808 // in handle_wrong_method which is the backend of the handshake. See
809 // code in i2c adapters and handle_wrong_method.
810
811 Method* _callee_target;
812
813 // Used to pass back results to the interpreter or generated code running Java code.
814 oop _vm_result; // oop result is GC-preserved
815 Metadata* _vm_result_2; // non-oop result
816
817 // See ReduceInitialCardMarks: this holds the precise space interval of
818 // the most recent slow path allocation for which compiled code has
819 // elided card-marks for performance along the fast-path.
820 MemRegion _deferred_card_mark;
821
822 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
823 // allocated during deoptimization
824 // and by JNI_MonitorEnter/Exit
825
826 // Async. requests support
827 enum AsyncRequests {
828 _no_async_condition = 0,
829 _async_exception,
830 _async_unsafe_access_error
831 };
832 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
833 oop _pending_async_exception;
834
835 // Safepoint support
836 public: // Expose _thread_state for SafeFetchInt()
837 volatile JavaThreadState _thread_state;
838 private:
839 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
840 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
841
842 // JavaThread termination support
843 enum TerminatedTypes {
844 _not_terminated = 0xDEAD - 2,
845 _thread_exiting, // JavaThread::exit() has been called for this thread
846 _thread_terminated, // JavaThread is removed from thread list
847 _vm_exited // JavaThread is still executing native code, but VM is terminated
848 // only VM_Exit can set _vm_exited
849 };
850
851 // In general a JavaThread's _terminated field transitions as follows:
852 //
853 // _not_terminated => _thread_exiting => _thread_terminated
854 //
855 // _vm_exited is a special value to cover the case of a JavaThread
856 // executing native code after the VM itself is terminated.
857 volatile TerminatedTypes _terminated;
858 // suspend/resume support
859 volatile bool _suspend_equivalent; // Suspend equivalent condition
860 jint _in_deopt_handler; // count of deoptimization
861 // handlers thread is in
862 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
863 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
864 // never locked) when throwing an exception. Used by interpreter only.
865
866 // JNI attach states:
867 enum JNIAttachStates {
868 _not_attaching_via_jni = 1, // thread is not attaching via JNI
869 _attaching_via_jni, // thread is attaching via JNI
870 _attached_via_jni // thread has attached via JNI
871 };
872
873 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
874 // A native thread that is attaching via JNI starts with a value
875 // of _attaching_via_jni and transitions to _attached_via_jni.
876 volatile JNIAttachStates _jni_attach_state;
877
878 public:
879 // State of the stack guard pages for this thread.
880 enum StackGuardState {
881 stack_guard_unused, // not needed
882 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
883 stack_guard_enabled // enabled
884 };
885
886 private:
887
888 StackGuardState _stack_guard_state;
889
890 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
891 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
892 // code)
893 volatile oop _exception_oop; // Exception thrown in compiled code
894 volatile address _exception_pc; // PC where exception happened
895 volatile address _exception_handler_pc; // PC for handler of exception
896 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
897
898 // support for compilation
899 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
900
901 // support for JNI critical regions
902 jint _jni_active_critical; // count of entries into JNI critical region
903
904 // For deadlock detection.
905 int _depth_first_number;
906
907 // JVMTI PopFrame support
908 // This is set to popframe_pending to signal that top Java frame should be popped immediately
909 int _popframe_condition;
910
911 #ifndef PRODUCT
912 int _jmp_ring_index;
913 struct {
914 // We use intptr_t instead of address so debugger doesn't try and display strings
915 intptr_t _target;
916 intptr_t _instruction;
917 const char* _file;
918 int _line;
919 } _jmp_ring[ jump_ring_buffer_size ];
920 #endif /* PRODUCT */
921
922 #ifndef SERIALGC
923 // Support for G1 barriers
924
925 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
926 // Set of all such queues.
927 static SATBMarkQueueSet _satb_mark_queue_set;
928
929 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
930 // Set of all such queues.
931 static DirtyCardQueueSet _dirty_card_queue_set;
932
933 void flush_barrier_queues();
934 #endif // !SERIALGC
935
936 friend class VMThread;
937 friend class ThreadWaitTransition;
938 friend class VM_Exit;
939
940 void initialize(); // Initialized the instance variables
941
942 public:
943 // Constructor
944 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
945 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
946 ~JavaThread();
947
948 #ifdef ASSERT
949 // verify this JavaThread hasn't be published in the Threads::list yet
950 void verify_not_published();
951 #endif
952
953 //JNI functiontable getter/setter for JVMTI jni function table interception API.
954 void set_jni_functions(struct JNINativeInterface_* functionTable) {
955 _jni_environment.functions = functionTable;
956 }
957 struct JNINativeInterface_* get_jni_functions() {
958 return (struct JNINativeInterface_ *)_jni_environment.functions;
959 }
960
961 // This function is called at thread creation to allow
962 // platform specific thread variables to be initialized.
963 void cache_global_variables();
964
965 // Executes Shutdown.shutdown()
966 void invoke_shutdown_hooks();
967
968 // Cleanup on thread exit
969 enum ExitType {
970 normal_exit,
971 jni_detach
972 };
973 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
974
975 void cleanup_failed_attach_current_thread();
976
977 // Testers
978 virtual bool is_Java_thread() const { return true; }
979
980 // compilation
981 void set_is_compiling(bool f) { _is_compiling = f; }
982 bool is_compiling() const { return _is_compiling; }
983
984 // Thread chain operations
985 JavaThread* next() const { return _next; }
986 void set_next(JavaThread* p) { _next = p; }
987
988 // Thread oop. threadObj() can be NULL for initial JavaThread
989 // (or for threads attached via JNI)
990 oop threadObj() const { return _threadObj; }
991 void set_threadObj(oop p) { _threadObj = p; }
992
993 ThreadPriority java_priority() const; // Read from threadObj()
994
995 // Prepare thread and add to priority queue. If a priority is
996 // not specified, use the priority of the thread object. Threads_lock
997 // must be held while this function is called.
998 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
999
1000 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1001 address saved_exception_pc() { return _saved_exception_pc; }
1002
1003
1004 ThreadFunction entry_point() const { return _entry_point; }
1005
1006 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1007 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1008
1009 // Last frame anchor routines
1010
1011 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1012
1013 // last_Java_sp
1014 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1015 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1016
1017 // last_Java_pc
1018
1019 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1020
1021 // Safepoint support
1022 JavaThreadState thread_state() const { return _thread_state; }
1023 void set_thread_state(JavaThreadState s) { _thread_state=s; }
1024 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1025 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1026 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1027
1028 // thread has called JavaThread::exit() or is terminated
1029 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1030 // thread is terminated (no longer on the threads list); we compare
1031 // against the two non-terminated values so that a freed JavaThread
1032 // will also be considered terminated.
1033 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1034 void set_terminated(TerminatedTypes t) { _terminated = t; }
1035 // special for Threads::remove() which is static:
1036 void set_terminated_value() { _terminated = _thread_terminated; }
1037 void block_if_vm_exited();
1038
1039 bool doing_unsafe_access() { return _doing_unsafe_access; }
1040 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1041
1042 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1043 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1044
1045 #if INCLUDE_NMT
1046 // native memory tracking
1047 inline MemRecorder* get_recorder() const { return (MemRecorder*)_recorder; }
1048 inline void set_recorder(MemRecorder* rc) { _recorder = (volatile MemRecorder*)rc; }
1049
1050 private:
1051 // per-thread memory recorder
1052 volatile MemRecorder* _recorder;
1053 #endif // INCLUDE_NMT
1054
1055 // Suspend/resume support for JavaThread
1056 private:
1057 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1058 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1059
1060 public:
1061 void java_suspend();
1062 void java_resume();
1063 int java_suspend_self();
1064
1065 void check_and_wait_while_suspended() {
1066 assert(JavaThread::current() == this, "sanity check");
1067
1068 bool do_self_suspend;
1069 do {
1070 // were we externally suspended while we were waiting?
1071 do_self_suspend = handle_special_suspend_equivalent_condition();
1072 if (do_self_suspend) {
1073 // don't surprise the thread that suspended us by returning
1074 java_suspend_self();
1075 set_suspend_equivalent();
1076 }
1077 } while (do_self_suspend);
1078 }
1079 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1080 // Check for async exception in addition to safepoint and suspend request.
1081 static void check_special_condition_for_native_trans(JavaThread *thread);
1082
1083 // Same as check_special_condition_for_native_trans but finishes the
1084 // transition into thread_in_Java mode so that it can potentially
1085 // block.
1086 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1087
1088 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1089 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1090 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1091 // Warning: is_ext_suspend_completed() may temporarily drop the
1092 // SR_lock to allow the thread to reach a stable thread state if
1093 // it is currently in a transient thread state.
1094 return is_ext_suspend_completed(false /*!called_by_wait */,
1095 SuspendRetryDelay, bits);
1096 }
1097
1098 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1099 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1100 // passed as the count and delay parameters. Experiments with specific
1101 // calls to wait_for_ext_suspend_completion() can be done by passing
1102 // other values in the code. Experiments with all calls can be done
1103 // via the appropriate -XX options.
1104 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1105
1106 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1107 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1108
1109 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1110 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1111 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1112
1113 bool is_external_suspend() const {
1114 return (_suspend_flags & _external_suspend) != 0;
1115 }
1116 // Whenever a thread transitions from native to vm/java it must suspend
1117 // if external|deopt suspend is present.
1118 bool is_suspend_after_native() const {
1119 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1120 }
1121
1122 // external suspend request is completed
1123 bool is_ext_suspended() const {
1124 return (_suspend_flags & _ext_suspended) != 0;
1125 }
1126
1127 bool is_external_suspend_with_lock() const {
1128 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1129 return is_external_suspend();
1130 }
1131
1132 // Special method to handle a pending external suspend request
1133 // when a suspend equivalent condition lifts.
1134 bool handle_special_suspend_equivalent_condition() {
1135 assert(is_suspend_equivalent(),
1136 "should only be called in a suspend equivalence condition");
1137 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1138 bool ret = is_external_suspend();
1139 if (!ret) {
1140 // not about to self-suspend so clear suspend equivalence
1141 clear_suspend_equivalent();
1142 }
1143 // implied else:
1144 // We have a pending external suspend request so we leave the
1145 // suspend_equivalent flag set until java_suspend_self() sets
1146 // the ext_suspended flag and clears the suspend_equivalent
1147 // flag. This insures that wait_for_ext_suspend_completion()
1148 // will return consistent values.
1149 return ret;
1150 }
1151
1152 // utility methods to see if we are doing some kind of suspension
1153 bool is_being_ext_suspended() const {
1154 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1155 return is_ext_suspended() || is_external_suspend();
1156 }
1157
1158 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1159
1160 void set_suspend_equivalent() { _suspend_equivalent = true; };
1161 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1162
1163 // Thread.stop support
1164 void send_thread_stop(oop throwable);
1165 AsyncRequests clear_special_runtime_exit_condition() {
1166 AsyncRequests x = _special_runtime_exit_condition;
1167 _special_runtime_exit_condition = _no_async_condition;
1168 return x;
1169 }
1170
1171 // Are any async conditions present?
1172 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1173
1174 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1175
1176 // these next two are also used for self-suspension and async exception support
1177 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1178
1179 // Return true if JavaThread has an asynchronous condition or
1180 // if external suspension is requested.
1181 bool has_special_runtime_exit_condition() {
1182 // We call is_external_suspend() last since external suspend should
1183 // be less common. Because we don't use is_external_suspend_with_lock
1184 // it is possible that we won't see an asynchronous external suspend
1185 // request that has just gotten started, i.e., SR_lock grabbed but
1186 // _external_suspend field change either not made yet or not visible
1187 // yet. However, this is okay because the request is asynchronous and
1188 // we will see the new flag value the next time through. It's also
1189 // possible that the external suspend request is dropped after
1190 // we have checked is_external_suspend(), we will recheck its value
1191 // under SR_lock in java_suspend_self().
1192 return (_special_runtime_exit_condition != _no_async_condition) ||
1193 is_external_suspend() || is_deopt_suspend();
1194 }
1195
1196 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1197
1198 void set_pending_async_exception(oop e) {
1199 _pending_async_exception = e;
1200 _special_runtime_exit_condition = _async_exception;
1201 set_has_async_exception();
1202 }
1203
1204 // Fast-locking support
1205 bool is_lock_owned(address adr) const;
1206
1207 // Accessors for vframe array top
1208 // The linked list of vframe arrays are sorted on sp. This means when we
1209 // unpack the head must contain the vframe array to unpack.
1210 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1211 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1212
1213 // Side structure for defering update of java frame locals until deopt occurs
1214 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1215 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1216
1217 // These only really exist to make debugging deopt problems simpler
1218
1219 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1220 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1221
1222 // The special resourceMark used during deoptimization
1223
1224 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1225 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1226
1227 intptr_t* must_deopt_id() { return _must_deopt_id; }
1228 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1229 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1230
1231 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1232 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1233
1234 Method* callee_target() const { return _callee_target; }
1235 void set_callee_target (Method* x) { _callee_target = x; }
1236
1237 // Oop results of vm runtime calls
1238 oop vm_result() const { return _vm_result; }
1239 void set_vm_result (oop x) { _vm_result = x; }
1240
1241 Metadata* vm_result_2() const { return _vm_result_2; }
1242 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1243
1244 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1245 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1246
1247 // Exception handling for compiled methods
1248 oop exception_oop() const { return _exception_oop; }
1249 address exception_pc() const { return _exception_pc; }
1250 address exception_handler_pc() const { return _exception_handler_pc; }
1251 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1252
1253 void set_exception_oop(oop o) { _exception_oop = o; }
1254 void set_exception_pc(address a) { _exception_pc = a; }
1255 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1256 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1257
1258 // Stack overflow support
1259 inline size_t stack_available(address cur_sp);
1260 address stack_yellow_zone_base()
1261 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1262 size_t stack_yellow_zone_size()
1263 { return StackYellowPages * os::vm_page_size(); }
1264 address stack_red_zone_base()
1265 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1266 size_t stack_red_zone_size()
1267 { return StackRedPages * os::vm_page_size(); }
1268 bool in_stack_yellow_zone(address a)
1269 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1270 bool in_stack_red_zone(address a)
1271 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1272
1273 void create_stack_guard_pages();
1274 void remove_stack_guard_pages();
1275
1276 void enable_stack_yellow_zone();
1277 void disable_stack_yellow_zone();
1278 void enable_stack_red_zone();
1279 void disable_stack_red_zone();
1280
1281 inline bool stack_yellow_zone_disabled();
1282 inline bool stack_yellow_zone_enabled();
1283
1284 // Attempt to reguard the stack after a stack overflow may have occurred.
1285 // Returns true if (a) guard pages are not needed on this thread, (b) the
1286 // pages are already guarded, or (c) the pages were successfully reguarded.
1287 // Returns false if there is not enough stack space to reguard the pages, in
1288 // which case the caller should unwind a frame and try again. The argument
1289 // should be the caller's (approximate) sp.
1290 bool reguard_stack(address cur_sp);
1291 // Similar to above but see if current stackpoint is out of the guard area
1292 // and reguard if possible.
1293 bool reguard_stack(void);
1294
1295 // Misc. accessors/mutators
1296 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1297 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1298 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1299
1300 #ifndef PRODUCT
1301 void record_jump(address target, address instr, const char* file, int line);
1302 #endif /* PRODUCT */
1303
1304 // For assembly stub generation
1305 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1306 #ifndef PRODUCT
1307 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1308 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1309 #endif /* PRODUCT */
1310 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1311 static ByteSize last_Java_sp_offset() {
1312 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1313 }
1314 static ByteSize last_Java_pc_offset() {
1315 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1316 }
1317 static ByteSize frame_anchor_offset() {
1318 return byte_offset_of(JavaThread, _anchor);
1319 }
1320 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1321 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1322 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1323 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1324 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1325 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1326 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1327 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1328 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1329 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1330 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1331 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1332
1333 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1334 static ByteSize should_post_on_exceptions_flag_offset() {
1335 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1336 }
1337
1338 #ifndef SERIALGC
1339 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1340 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1341 #endif // !SERIALGC
1342
1343 // Returns the jni environment for this thread
1344 JNIEnv* jni_environment() { return &_jni_environment; }
1345
1346 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1347 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1348 // Only return NULL if thread is off the thread list; starting to
1349 // exit should not return NULL.
1350 if (thread_from_jni_env->is_terminated()) {
1351 thread_from_jni_env->block_if_vm_exited();
1352 return NULL;
1353 } else {
1354 return thread_from_jni_env;
1355 }
1356 }
1357
1358 // JNI critical regions. These can nest.
1359 bool in_critical() { return _jni_active_critical > 0; }
1360 bool in_last_critical() { return _jni_active_critical == 1; }
1361 void enter_critical() { assert(Thread::current() == this ||
1362 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1363 "this must be current thread or synchronizing");
1364 _jni_active_critical++; }
1365 void exit_critical() { assert(Thread::current() == this,
1366 "this must be current thread");
1367 _jni_active_critical--;
1368 assert(_jni_active_critical >= 0,
1369 "JNI critical nesting problem?"); }
1370
1371 // For deadlock detection
1372 int depth_first_number() { return _depth_first_number; }
1373 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1374
1375 private:
1376 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1377
1378 public:
1379 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1380 void add_monitor_chunk(MonitorChunk* chunk);
1381 void remove_monitor_chunk(MonitorChunk* chunk);
1382 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1383 void inc_in_deopt_handler() { _in_deopt_handler++; }
1384 void dec_in_deopt_handler() {
1385 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1386 if (_in_deopt_handler > 0) { // robustness
1387 _in_deopt_handler--;
1388 }
1389 }
1390
1391 private:
1392 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1393
1394 public:
1395
1396 // Frame iteration; calls the function f for all frames on the stack
1397 void frames_do(void f(frame*, const RegisterMap*));
1398
1399 // Memory operations
1400 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1401
1402 // Sweeper operations
1403 void nmethods_do(CodeBlobClosure* cf);
1404
1405 // RedefineClasses Support
1406 void metadata_do(void f(Metadata*));
1407
1408 // Memory management operations
1409 void gc_epilogue();
1410 void gc_prologue();
1411
1412 // Misc. operations
1413 char* name() const { return (char*)get_thread_name(); }
1414 void print_on(outputStream* st) const;
1415 void print() const { print_on(tty); }
1416 void print_value();
1417 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1418 void print_thread_state() const PRODUCT_RETURN;
1419 void print_on_error(outputStream* st, char* buf, int buflen) const;
1420 void verify();
1421 const char* get_thread_name() const;
1422 private:
1423 // factor out low-level mechanics for use in both normal and error cases
1424 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1425 public:
1426 const char* get_threadgroup_name() const;
1427 const char* get_parent_name() const;
1428
1429 // Accessing frames
1430 frame last_frame() {
1431 _anchor.make_walkable(this);
1432 return pd_last_frame();
1433 }
1434 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1435
1436 // Returns method at 'depth' java or native frames down the stack
1437 // Used for security checks
1438 Klass* security_get_caller_class(int depth);
1439
1440 // Print stack trace in external format
1441 void print_stack_on(outputStream* st);
1442 void print_stack() { print_stack_on(tty); }
1443
1444 // Print stack traces in various internal formats
1445 void trace_stack() PRODUCT_RETURN;
1446 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1447 void trace_frames() PRODUCT_RETURN;
1448 void trace_oops() PRODUCT_RETURN;
1449
1450 // Print an annotated view of the stack frames
1451 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1452 void validate_frame_layout() {
1453 print_frame_layout(0, true);
1454 }
1455
1456 // Returns the number of stack frames on the stack
1457 int depth() const;
1458
1459 // Function for testing deoptimization
1460 void deoptimize();
1461 void make_zombies();
1462
1463 void deoptimized_wrt_marked_nmethods();
1464
1465 // Profiling operation (see fprofile.cpp)
1466 public:
1467 bool profile_last_Java_frame(frame* fr);
1468
1469 private:
1470 ThreadProfiler* _thread_profiler;
1471 private:
1472 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1473 friend class FlatProfilerTask; // uses get_thread_profiler.
1474 friend class ThreadProfilerMark; // uses get_thread_profiler.
1475 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1476 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1477 ThreadProfiler* result = _thread_profiler;
1478 _thread_profiler = tp;
1479 return result;
1480 }
1481
1482 // NMT (Native memory tracking) support.
1483 // This flag helps NMT to determine if this JavaThread will be blocked
1484 // at safepoint. If not, ThreadCritical is needed for writing memory records.
1485 // JavaThread is only safepoint visible when it is in Threads' thread list,
1486 // it is not visible until it is added to the list and becomes invisible
1487 // once it is removed from the list.
1488 public:
1489 bool is_safepoint_visible() const { return _safepoint_visible; }
1490 void set_safepoint_visible(bool visible) { _safepoint_visible = visible; }
1491 private:
1492 bool _safepoint_visible;
1493
1494 // Static operations
1495 public:
1496 // Returns the running thread as a JavaThread
1497 static inline JavaThread* current();
1498
1499 // Returns the active Java thread. Do not use this if you know you are calling
1500 // from a JavaThread, as it's slower than JavaThread::current. If called from
1501 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1502 // operation. You may not want that either.
1503 static JavaThread* active();
1504
1505 inline CompilerThread* as_CompilerThread();
1506
1507 public:
1508 virtual void run();
1509 void thread_main_inner();
1510
1511 private:
1512 // PRIVILEGED STACK
1513 PrivilegedElement* _privileged_stack_top;
1514 GrowableArray<oop>* _array_for_gc;
1515 public:
1516
1517 // Returns the privileged_stack information.
1518 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1519 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1520 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1521
1522 public:
1523 // Thread local information maintained by JVMTI.
1524 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1525 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1526 // getter is used to get this JavaThread's JvmtiThreadState if it has
1527 // one which means NULL can be returned. JvmtiThreadState::state_for()
1528 // is used to get the specified JavaThread's JvmtiThreadState if it has
1529 // one or it allocates a new JvmtiThreadState for the JavaThread and
1530 // returns it. JvmtiThreadState::state_for() will return NULL only if
1531 // the specified JavaThread is exiting.
1532 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1533 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1534 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1535 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1536
1537 // JVMTI PopFrame support
1538 // Setting and clearing popframe_condition
1539 // All of these enumerated values are bits. popframe_pending
1540 // indicates that a PopFrame() has been requested and not yet been
1541 // completed. popframe_processing indicates that that PopFrame() is in
1542 // the process of being completed. popframe_force_deopt_reexecution_bit
1543 // indicates that special handling is required when returning to a
1544 // deoptimized caller.
1545 enum PopCondition {
1546 popframe_inactive = 0x00,
1547 popframe_pending_bit = 0x01,
1548 popframe_processing_bit = 0x02,
1549 popframe_force_deopt_reexecution_bit = 0x04
1550 };
1551 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1552 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1553 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1554 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1555 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1556 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1557 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1558 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1559 #ifdef CC_INTERP
1560 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1561 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1562 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1563 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1564 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1565 #endif
1566
1567 private:
1568 // Saved incoming arguments to popped frame.
1569 // Used only when popped interpreted frame returns to deoptimized frame.
1570 void* _popframe_preserved_args;
1571 int _popframe_preserved_args_size;
1572
1573 public:
1574 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1575 void* popframe_preserved_args();
1576 ByteSize popframe_preserved_args_size();
1577 WordSize popframe_preserved_args_size_in_words();
1578 void popframe_free_preserved_args();
1579
1580
1581 private:
1582 JvmtiThreadState *_jvmti_thread_state;
1583 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1584
1585 // Used by the interpreter in fullspeed mode for frame pop, method
1586 // entry, method exit and single stepping support. This field is
1587 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1588 // It can be set to zero asynchronously (i.e., without a VM operation
1589 // or a lock) so we have to be very careful.
1590 int _interp_only_mode;
1591
1592 public:
1593 // used by the interpreter for fullspeed debugging support (see above)
1594 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1595 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1596 int get_interp_only_mode() { return _interp_only_mode; }
1597 void increment_interp_only_mode() { ++_interp_only_mode; }
1598 void decrement_interp_only_mode() { --_interp_only_mode; }
1599
1600 // support for cached flag that indicates whether exceptions need to be posted for this thread
1601 // if this is false, we can avoid deoptimizing when events are thrown
1602 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1603 private:
1604 int _should_post_on_exceptions_flag;
1605
1606 public:
1607 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1608 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1609
1610 private:
1611 ThreadStatistics *_thread_stat;
1612
1613 public:
1614 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1615
1616 // Return a blocker object for which this thread is blocked parking.
1617 oop current_park_blocker();
1618
1619 private:
1620 static size_t _stack_size_at_create;
1621
1622 public:
1623 static inline size_t stack_size_at_create(void) {
1624 return _stack_size_at_create;
1625 }
1626 static inline void set_stack_size_at_create(size_t value) {
1627 _stack_size_at_create = value;
1628 }
1629
1630 #ifndef SERIALGC
1631 // SATB marking queue support
1632 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1633 static SATBMarkQueueSet& satb_mark_queue_set() {
1634 return _satb_mark_queue_set;
1635 }
1636
1637 // Dirty card queue support
1638 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1639 static DirtyCardQueueSet& dirty_card_queue_set() {
1640 return _dirty_card_queue_set;
1641 }
1642 #endif // !SERIALGC
1643
1644 // This method initializes the SATB and dirty card queues before a
1645 // JavaThread is added to the Java thread list. Right now, we don't
1646 // have to do anything to the dirty card queue (it should have been
1647 // activated when the thread was created), but we have to activate
1648 // the SATB queue if the thread is created while a marking cycle is
1649 // in progress. The activation / de-activation of the SATB queues at
1650 // the beginning / end of a marking cycle is done during safepoints
1651 // so we have to make sure this method is called outside one to be
1652 // able to safely read the active field of the SATB queue set. Right
1653 // now, it is called just before the thread is added to the Java
1654 // thread list in the Threads::add() method. That method is holding
1655 // the Threads_lock which ensures we are outside a safepoint. We
1656 // cannot do the obvious and set the active field of the SATB queue
1657 // when the thread is created given that, in some cases, safepoints
1658 // might happen between the JavaThread constructor being called and the
1659 // thread being added to the Java thread list (an example of this is
1660 // when the structure for the DestroyJavaVM thread is created).
1661 #ifndef SERIALGC
1662 void initialize_queues();
1663 #else // !SERIALGC
1664 void initialize_queues() { }
1665 #endif // !SERIALGC
1666
1667 // Machine dependent stuff
1668 #ifdef TARGET_OS_ARCH_linux_x86
1669 # include "thread_linux_x86.hpp"
1670 #endif
1671 #ifdef TARGET_OS_ARCH_linux_sparc
1672 # include "thread_linux_sparc.hpp"
1673 #endif
1674 #ifdef TARGET_OS_ARCH_linux_zero
1675 # include "thread_linux_zero.hpp"
1676 #endif
1677 #ifdef TARGET_OS_ARCH_solaris_x86
1678 # include "thread_solaris_x86.hpp"
1679 #endif
1680 #ifdef TARGET_OS_ARCH_solaris_sparc
1681 # include "thread_solaris_sparc.hpp"
1682 #endif
1683 #ifdef TARGET_OS_ARCH_windows_x86
1684 # include "thread_windows_x86.hpp"
1685 #endif
1686 #ifdef TARGET_OS_ARCH_linux_arm
1687 # include "thread_linux_arm.hpp"
1688 #endif
1689 #ifdef TARGET_OS_ARCH_linux_ppc
1690 # include "thread_linux_ppc.hpp"
1691 #endif
1692 #ifdef TARGET_OS_ARCH_bsd_x86
1693 # include "thread_bsd_x86.hpp"
1694 #endif
1695 #ifdef TARGET_OS_ARCH_bsd_zero
1696 # include "thread_bsd_zero.hpp"
1697 #endif
1698
1699
1700 public:
1701 void set_blocked_on_compilation(bool value) {
1702 _blocked_on_compilation = value;
1703 }
1704
1705 bool blocked_on_compilation() {
1706 return _blocked_on_compilation;
1707 }
1708 protected:
1709 bool _blocked_on_compilation;
1710
1711
1712 // JSR166 per-thread parker
1713 private:
1714 Parker* _parker;
1715 public:
1716 Parker* parker() { return _parker; }
1717
1718 // Biased locking support
1719 private:
1720 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1721 public:
1722 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1723 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1724
1725 // clearing/querying jni attach status
1726 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1727 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1728 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); }
1729 private:
1730 // This field is used to determine if a thread has claimed
1731 // a par_id: it is -1 if the thread has not claimed a par_id;
1732 // otherwise its value is the par_id that has been claimed.
1733 int _claimed_par_id;
1734 public:
1735 int get_claimed_par_id() { return _claimed_par_id; }
1736 void set_claimed_par_id(int id) { _claimed_par_id = id;}
1737 };
1738
1739 // Inline implementation of JavaThread::current
1740 inline JavaThread* JavaThread::current() {
1741 Thread* thread = ThreadLocalStorage::thread();
1742 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1743 return (JavaThread*)thread;
1744 }
1745
1746 inline CompilerThread* JavaThread::as_CompilerThread() {
1747 assert(is_Compiler_thread(), "just checking");
1748 return (CompilerThread*)this;
1749 }
1750
1751 inline bool JavaThread::stack_yellow_zone_disabled() {
1752 return _stack_guard_state == stack_guard_yellow_disabled;
1753 }
1754
1755 inline bool JavaThread::stack_yellow_zone_enabled() {
1756 #ifdef ASSERT
1757 if (os::uses_stack_guard_pages()) {
1758 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1759 }
1760 #endif
1761 return _stack_guard_state == stack_guard_enabled;
1762 }
1763
1764 inline size_t JavaThread::stack_available(address cur_sp) {
1765 // This code assumes java stacks grow down
1766 address low_addr; // Limit on the address for deepest stack depth
1767 if ( _stack_guard_state == stack_guard_unused) {
1768 low_addr = stack_base() - stack_size();
1769 } else {
1770 low_addr = stack_yellow_zone_base();
1771 }
1772 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1773 }
1774
1775 // A thread used for Compilation.
1776 class CompilerThread : public JavaThread {
1777 friend class VMStructs;
1778 private:
1779 CompilerCounters* _counters;
1780
1781 ciEnv* _env;
1782 CompileLog* _log;
1783 CompileTask* _task;
1784 CompileQueue* _queue;
1785 BufferBlob* _buffer_blob;
1786
1787 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1788
1789 public:
1790
1791 static CompilerThread* current();
1792
1793 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1794
1795 bool is_Compiler_thread() const { return true; }
1796 // Hide this compiler thread from external view.
1797 bool is_hidden_from_external_view() const { return true; }
1798
1799 CompileQueue* queue() { return _queue; }
1800 CompilerCounters* counters() { return _counters; }
1801
1802 // Get/set the thread's compilation environment.
1803 ciEnv* env() { return _env; }
1804 void set_env(ciEnv* env) { _env = env; }
1805
1806 BufferBlob* get_buffer_blob() { return _buffer_blob; }
1807 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1808
1809 // Get/set the thread's logging information
1810 CompileLog* log() { return _log; }
1811 void init_log(CompileLog* log) {
1812 // Set once, for good.
1813 assert(_log == NULL, "set only once");
1814 _log = log;
1815 }
1816
1817 // GC support
1818 // Apply "f->do_oop" to all root oops in "this".
1819 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1820 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1821
1822 #ifndef PRODUCT
1823 private:
1824 IdealGraphPrinter *_ideal_graph_printer;
1825 public:
1826 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1827 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1828 #endif
1829
1830 // Get/set the thread's current task
1831 CompileTask* task() { return _task; }
1832 void set_task(CompileTask* task) { _task = task; }
1833
1834 // Track the nmethod currently being scanned by the sweeper
1835 void set_scanned_nmethod(nmethod* nm) {
1836 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1837 _scanned_nmethod = nm;
1838 }
1839 };
1840
1841 inline CompilerThread* CompilerThread::current() {
1842 return JavaThread::current()->as_CompilerThread();
1843 }
1844
1845
1846 // The active thread queue. It also keeps track of the current used
1847 // thread priorities.
1848 class Threads: AllStatic {
1849 friend class VMStructs;
1850 private:
1851 static JavaThread* _thread_list;
1852 static int _number_of_threads;
1853 static int _number_of_non_daemon_threads;
1854 static int _return_code;
1855 #ifdef ASSERT
1856 static bool _vm_complete;
1857 #endif
1858
1859 public:
1860 // Thread management
1861 // force_daemon is a concession to JNI, where we may need to add a
1862 // thread to the thread list before allocating its thread object
1863 static void add(JavaThread* p, bool force_daemon = false);
1864 static void remove(JavaThread* p);
1865 static bool includes(JavaThread* p);
1866 static JavaThread* first() { return _thread_list; }
1867 static void threads_do(ThreadClosure* tc);
1868
1869 // Initializes the vm and creates the vm thread
1870 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1871 static void convert_vm_init_libraries_to_agents();
1872 static void create_vm_init_libraries();
1873 static void create_vm_init_agents();
1874 static void shutdown_vm_agents();
1875 static bool destroy_vm();
1876 // Supported VM versions via JNI
1877 // Includes JNI_VERSION_1_1
1878 static jboolean is_supported_jni_version_including_1_1(jint version);
1879 // Does not include JNI_VERSION_1_1
1880 static jboolean is_supported_jni_version(jint version);
1881
1882 // Garbage collection
1883 static void follow_other_roots(void f(oop*));
1884
1885 // Apply "f->do_oop" to all root oops in all threads.
1886 // This version may only be called by sequential code.
1887 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
1888 // This version may be called by sequential or parallel code.
1889 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf);
1890 // This creates a list of GCTasks, one per thread.
1891 static void create_thread_roots_tasks(GCTaskQueue* q);
1892 // This creates a list of GCTasks, one per thread, for marking objects.
1893 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1894
1895 // Apply "f->do_oop" to roots in all threads that
1896 // are part of compiled frames
1897 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1898
1899 static void convert_hcode_pointers();
1900 static void restore_hcode_pointers();
1901
1902 // Sweeper
1903 static void nmethods_do(CodeBlobClosure* cf);
1904
1905 // RedefineClasses support
1906 static void metadata_do(void f(Metadata*));
1907
1908 static void gc_epilogue();
1909 static void gc_prologue();
1910 #ifdef ASSERT
1911 static bool is_vm_complete() { return _vm_complete; }
1912 #endif
1913
1914 // Verification
1915 static void verify();
1916 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1917 static void print(bool print_stacks, bool internal_format) {
1918 // this function is only used by debug.cpp
1919 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1920 }
1921 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1922
1923 // Get Java threads that are waiting to enter a monitor. If doLock
1924 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1925 // VM needs to be at a safepoint.
1926 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1927 address monitor, bool doLock);
1928
1929 // Get owning Java thread from the monitor's owner field. If doLock
1930 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1931 // VM needs to be at a safepoint.
1932 static JavaThread *owning_thread_from_monitor_owner(address owner,
1933 bool doLock);
1934
1935 // Number of threads on the active threads list
1936 static int number_of_threads() { return _number_of_threads; }
1937 // Number of non-daemon threads on the active threads list
1938 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1939
1940 // Deoptimizes all frames tied to marked nmethods
1941 static void deoptimized_wrt_marked_nmethods();
1942
1943 };
1944
1945
1946 // Thread iterator
1947 class ThreadClosure: public StackObj {
1948 public:
1949 virtual void do_thread(Thread* thread) = 0;
1950 };
1951
1952 class SignalHandlerMark: public StackObj {
1953 private:
1954 Thread* _thread;
1955 public:
1956 SignalHandlerMark(Thread* t) {
1957 _thread = t;
1958 if (_thread) _thread->enter_signal_handler();
1959 }
1960 ~SignalHandlerMark() {
1961 if (_thread) _thread->leave_signal_handler();
1962 _thread = NULL;
1963 }
1964 };
1965
1966
1967 #endif // SHARE_VM_RUNTIME_THREAD_HPP