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