1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 #define SHARE_VM_RUNTIME_THREAD_HPP
27
28 #include "memory/allocation.hpp"
29 #include "memory/threadLocalAllocBuffer.hpp"
30 #include "oops/oop.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvmtiExport.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/javaFrameAnchor.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/mutexLocker.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/osThread.hpp"
39 #include "runtime/park.hpp"
40 #include "runtime/safepoint.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "runtime/threadLocalStorage.hpp"
43 #include "runtime/unhandledOops.hpp"
44 #include "utilities/macros.hpp"
45
46 #if INCLUDE_NMT
47 #include "services/memRecorder.hpp"
48 #endif // INCLUDE_NMT
49
50 #include "trace/traceBackend.hpp"
51 #include "trace/traceMacros.hpp"
52 #include "utilities/exceptions.hpp"
53 #include "utilities/top.hpp"
54 #if INCLUDE_ALL_GCS
55 #include "gc_implementation/g1/dirtyCardQueue.hpp"
56 #include "gc_implementation/g1/satbQueue.hpp"
57 #endif // INCLUDE_ALL_GCS
58 #ifdef ZERO
59 #ifdef TARGET_ARCH_zero
60 # include "stack_zero.hpp"
61 #endif
62 #endif
63
64 class ThreadSafepointState;
65 class ThreadProfiler;
66
67 class JvmtiThreadState;
68 class JvmtiGetLoadedClassesClosure;
69 class ThreadStatistics;
70 class ConcurrentLocksDump;
71 class ParkEvent;
72 class Parker;
73
74 class ciEnv;
75 class CompileThread;
76 class CompileLog;
77 class CompileTask;
78 class CompileQueue;
79 class CompilerCounters;
80 class vframeArray;
81
82 class DeoptResourceMark;
83 class jvmtiDeferredLocalVariableSet;
84
85 class GCTaskQueue;
86 class ThreadClosure;
87 class IdealGraphPrinter;
88
89 DEBUG_ONLY(class ResourceMark;)
90
91 class WorkerThread;
92
93 // Class hierarchy
94 // - Thread
95 // - NamedThread
96 // - VMThread
97 // - ConcurrentGCThread
98 // - WorkerThread
99 // - GangWorker
100 // - GCTaskThread
101 // - JavaThread
102 // - WatcherThread
103
104 class Thread: public ThreadShadow {
105 friend class VMStructs;
106 private:
107 // Exception handling
108 // (Note: _pending_exception and friends are in ThreadShadow)
109 //oop _pending_exception; // pending exception for current thread
110 // const char* _exception_file; // file information for exception (debugging only)
111 // int _exception_line; // line information for exception (debugging only)
112 protected:
113 // Support for forcing alignment of thread objects for biased locking
114 void* _real_malloc_address;
115 public:
116 void* operator new(size_t size) throw() { return allocate(size, true); }
117 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
118 return allocate(size, false); }
119 void operator delete(void* p);
120
121 protected:
122 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
123 private:
124
125 // ***************************************************************
126 // Suspend and resume support
127 // ***************************************************************
128 //
129 // VM suspend/resume no longer exists - it was once used for various
130 // things including safepoints but was deprecated and finally removed
131 // in Java 7. Because VM suspension was considered "internal" Java-level
132 // suspension was considered "external", and this legacy naming scheme
133 // remains.
134 //
135 // External suspend/resume requests come from JVM_SuspendThread,
136 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
137 // ResumeThread. External
138 // suspend requests cause _external_suspend to be set and external
139 // resume requests cause _external_suspend to be cleared.
140 // External suspend requests do not nest on top of other external
141 // suspend requests. The higher level APIs reject suspend requests
142 // for already suspended threads.
143 //
144 // The external_suspend
145 // flag is checked by has_special_runtime_exit_condition() and java thread
146 // will self-suspend when handle_special_runtime_exit_condition() is
147 // called. Most uses of the _thread_blocked state in JavaThreads are
148 // considered the same as being externally suspended; if the blocking
149 // condition lifts, the JavaThread will self-suspend. Other places
150 // where VM checks for external_suspend include:
151 // + mutex granting (do not enter monitors when thread is suspended)
152 // + state transitions from _thread_in_native
153 //
154 // In general, java_suspend() does not wait for an external suspend
155 // request to complete. When it returns, the only guarantee is that
156 // the _external_suspend field is true.
157 //
158 // wait_for_ext_suspend_completion() is used to wait for an external
159 // suspend request to complete. External suspend requests are usually
160 // followed by some other interface call that requires the thread to
161 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
162 // the interface that requires quiescence, we give the JavaThread a
163 // chance to self-suspend before we need it to be quiescent. This
164 // improves overall suspend/query performance.
165 //
166 // _suspend_flags controls the behavior of java_ suspend/resume.
167 // It must be set under the protection of SR_lock. Read from the flag is
168 // OK without SR_lock as long as the value is only used as a hint.
169 // (e.g., check _external_suspend first without lock and then recheck
170 // inside SR_lock and finish the suspension)
171 //
172 // _suspend_flags is also overloaded for other "special conditions" so
173 // that a single check indicates whether any special action is needed
174 // eg. for async exceptions.
175 // -------------------------------------------------------------------
176 // Notes:
177 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
178 // but we still update its value to keep other part of the system (mainly
179 // JVMTI) happy. ThreadState is legacy code (see notes in
180 // osThread.hpp).
181 //
182 // 2. It would be more natural if set_external_suspend() is private and
183 // part of java_suspend(), but that probably would affect the suspend/query
184 // performance. Need more investigation on this.
185 //
186
187 // suspend/resume lock: used for self-suspend
188 Monitor* _SR_lock;
189
190 protected:
191 enum SuspendFlags {
192 // NOTE: avoid using the sign-bit as cc generates different test code
193 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
194
195 _external_suspend = 0x20000000U, // thread is asked to self suspend
196 _ext_suspended = 0x40000000U, // thread has self-suspended
197 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
198
199 _has_async_exception = 0x00000001U, // there is a pending async exception
200 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
201 };
202
203 // various suspension related flags - atomically updated
204 // overloaded for async exception checking in check_special_condition_for_native_trans.
205 volatile uint32_t _suspend_flags;
206
207 private:
208 int _num_nested_signal;
209
210 public:
211 void enter_signal_handler() { _num_nested_signal++; }
212 void leave_signal_handler() { _num_nested_signal--; }
213 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
214
215 private:
216 // Debug tracing
217 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
218
219 // Active_handles points to a block of handles
220 JNIHandleBlock* _active_handles;
221
222 // One-element thread local free list
223 JNIHandleBlock* _free_handle_block;
224
225 // Point to the last handle mark
226 HandleMark* _last_handle_mark;
227
228 // The parity of the last strong_roots iteration in which this thread was
229 // claimed as a task.
230 jint _oops_do_parity;
231
232 public:
233 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
234 HandleMark* last_handle_mark() const { return _last_handle_mark; }
235 private:
236
237 // debug support for checking if code does allow safepoints or not
238 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
239 // mutex, or blocking on an object synchronizer (Java locking).
240 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
241 // If !allow_allocation(), then an assertion failure will happen during allocation
242 // (Hence, !allow_safepoint() => !allow_allocation()).
243 //
244 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
245 //
246 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
247 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
248
249 // Used by SkipGCALot class.
250 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
251
252 friend class No_Alloc_Verifier;
253 friend class No_Safepoint_Verifier;
254 friend class Pause_No_Safepoint_Verifier;
255 friend class ThreadLocalStorage;
256 friend class GC_locker;
257
258 ThreadLocalAllocBuffer _tlab; // Thread-local eden
259 jlong _allocated_bytes; // Cumulative number of bytes allocated on
260 // the Java heap
261
262 TRACE_DATA _trace_data; // Thread-local data for tracing
263
264 int _vm_operation_started_count; // VM_Operation support
265 int _vm_operation_completed_count; // VM_Operation support
266
267 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
268 // is waiting to lock
269 bool _current_pending_monitor_is_from_java; // locking is from Java code
270
271 // ObjectMonitor on which this thread called Object.wait()
272 ObjectMonitor* _current_waiting_monitor;
273
274 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
275 public:
276 ObjectMonitor* omFreeList;
277 int omFreeCount; // length of omFreeList
278 int omFreeProvision; // reload chunk size
279 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
280 int omInUseCount; // length of omInUseList
281
282 #ifdef ASSERT
283 private:
284 bool _visited_for_critical_count;
285
286 public:
287 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
288 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
289 #endif
290
291 public:
292 enum {
293 is_definitely_current_thread = true
294 };
295
296 // Constructor
297 Thread();
298 virtual ~Thread();
299
300 // initializtion
301 void initialize_thread_local_storage();
302
303 // thread entry point
304 virtual void run();
305
306 // Testers
307 virtual bool is_VM_thread() const { return false; }
308 virtual bool is_Java_thread() const { return false; }
309 virtual bool is_Compiler_thread() const { return false; }
310 virtual bool is_hidden_from_external_view() const { return false; }
311 virtual bool is_jvmti_agent_thread() const { return false; }
312 // True iff the thread can perform GC operations at a safepoint.
313 // Generally will be true only of VM thread and parallel GC WorkGang
314 // threads.
315 virtual bool is_GC_task_thread() const { return false; }
316 virtual bool is_Watcher_thread() const { return false; }
317 virtual bool is_ConcurrentGC_thread() const { return false; }
318 virtual bool is_Named_thread() const { return false; }
319 virtual bool is_Worker_thread() const { return false; }
320
321 // Casts
322 virtual WorkerThread* as_Worker_thread() const { return NULL; }
323
324 virtual char* name() const { return (char*)"Unknown thread"; }
325
326 // Returns the current thread
327 static inline Thread* current();
328
329 // Common thread operations
330 static void set_priority(Thread* thread, ThreadPriority priority);
331 static ThreadPriority get_priority(const Thread* const thread);
332 static void start(Thread* thread);
333 static void interrupt(Thread* thr);
334 static bool is_interrupted(Thread* thr, bool clear_interrupted);
335
336 void set_native_thread_name(const char *name) {
337 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
338 os::set_native_thread_name(name);
339 }
340
341 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
342 Monitor* SR_lock() const { return _SR_lock; }
343
344 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
345
346 inline void set_suspend_flag(SuspendFlags f);
347 inline void clear_suspend_flag(SuspendFlags f);
348
349 inline void set_has_async_exception();
350 inline void clear_has_async_exception();
351
352 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
353
354 inline void set_critical_native_unlock();
355 inline void clear_critical_native_unlock();
356
357 // Support for Unhandled Oop detection
358 #ifdef CHECK_UNHANDLED_OOPS
359 private:
360 UnhandledOops* _unhandled_oops;
361 public:
362 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
363 // Mark oop safe for gc. It may be stack allocated but won't move.
364 void allow_unhandled_oop(oop *op) {
365 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
366 }
367 // Clear oops at safepoint so crashes point to unhandled oop violator
368 void clear_unhandled_oops() {
369 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
370 }
371 #endif // CHECK_UNHANDLED_OOPS
372
373 #ifndef PRODUCT
374 bool skip_gcalot() { return _skip_gcalot; }
375 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
376 #endif
377
378 public:
379 // Installs a pending exception to be inserted later
380 static void send_async_exception(oop thread_oop, oop java_throwable);
381
382 // Resource area
383 ResourceArea* resource_area() const { return _resource_area; }
384 void set_resource_area(ResourceArea* area) { _resource_area = area; }
385
386 OSThread* osthread() const { return _osthread; }
387 void set_osthread(OSThread* thread) { _osthread = thread; }
388
389 // JNI handle support
390 JNIHandleBlock* active_handles() const { return _active_handles; }
391 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
392 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
393 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
394
395 // Internal handle support
396 HandleArea* handle_area() const { return _handle_area; }
397 void set_handle_area(HandleArea* area) { _handle_area = area; }
398
399 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
400 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
401
402 // Thread-Local Allocation Buffer (TLAB) support
403 ThreadLocalAllocBuffer& tlab() { return _tlab; }
404 void initialize_tlab() {
405 if (UseTLAB) {
406 tlab().initialize();
407 }
408 }
409
410 jlong allocated_bytes() { return _allocated_bytes; }
411 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
412 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
413 inline jlong cooked_allocated_bytes();
414
415 TRACE_DATA* trace_data() { return &_trace_data; }
416
417 // VM operation support
418 int vm_operation_ticket() { return ++_vm_operation_started_count; }
419 int vm_operation_completed_count() { return _vm_operation_completed_count; }
420 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
421
422 // For tracking the heavyweight monitor the thread is pending on.
423 ObjectMonitor* current_pending_monitor() {
424 return _current_pending_monitor;
425 }
426 void set_current_pending_monitor(ObjectMonitor* monitor) {
427 _current_pending_monitor = monitor;
428 }
429 void set_current_pending_monitor_is_from_java(bool from_java) {
430 _current_pending_monitor_is_from_java = from_java;
431 }
432 bool current_pending_monitor_is_from_java() {
433 return _current_pending_monitor_is_from_java;
434 }
435
436 // For tracking the ObjectMonitor on which this thread called Object.wait()
437 ObjectMonitor* current_waiting_monitor() {
438 return _current_waiting_monitor;
439 }
440 void set_current_waiting_monitor(ObjectMonitor* monitor) {
441 _current_waiting_monitor = monitor;
442 }
443
444 // GC support
445 // Apply "f->do_oop" to all root oops in "this".
446 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
447 // Used by JavaThread::oops_do.
448 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
449 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
450
451 // Handles the parallel case for the method below.
452 private:
453 bool claim_oops_do_par_case(int collection_parity);
454 public:
455 // Requires that "collection_parity" is that of the current strong roots
456 // iteration. If "is_par" is false, sets the parity of "this" to
457 // "collection_parity", and returns "true". If "is_par" is true,
458 // uses an atomic instruction to set the current threads parity to
459 // "collection_parity", if it is not already. Returns "true" iff the
460 // calling thread does the update, this indicates that the calling thread
461 // has claimed the thread's stack as a root groop in the current
462 // collection.
463 bool claim_oops_do(bool is_par, int collection_parity) {
464 if (!is_par) {
465 _oops_do_parity = collection_parity;
466 return true;
467 } else {
468 return claim_oops_do_par_case(collection_parity);
469 }
470 }
471
472 // Sweeper support
473 void nmethods_do(CodeBlobClosure* cf);
474
475 // jvmtiRedefineClasses support
476 void metadata_do(void f(Metadata*));
477
478 // Used by fast lock support
479 virtual bool is_lock_owned(address adr) const;
480
481 // Check if address is in the stack of the thread (not just for locks).
482 // Warning: the method can only be used on the running thread
483 bool is_in_stack(address adr) const;
484 // Check if address is in the usable part of the stack (excludes protected
485 // guard pages)
486 bool is_in_usable_stack(address adr) const;
487
488 // Sets this thread as starting thread. Returns failure if thread
489 // creation fails due to lack of memory, too many threads etc.
490 bool set_as_starting_thread();
491
492 protected:
493 // OS data associated with the thread
494 OSThread* _osthread; // Platform-specific thread information
495
496 // Thread local resource area for temporary allocation within the VM
497 ResourceArea* _resource_area;
498
499 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
500
501 // Thread local handle area for allocation of handles within the VM
502 HandleArea* _handle_area;
503 GrowableArray<Metadata*>* _metadata_handles;
504
505 // Support for stack overflow handling, get_thread, etc.
506 address _stack_base;
507 size_t _stack_size;
508 uintptr_t _self_raw_id; // used by get_thread (mutable)
509 int _lgrp_id;
510
511 public:
512 // Stack overflow support
513 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
514
515 void set_stack_base(address base) { _stack_base = base; }
516 size_t stack_size() const { return _stack_size; }
517 void set_stack_size(size_t size) { _stack_size = size; }
518 void record_stack_base_and_size();
519
520 bool on_local_stack(address adr) const {
521 /* QQQ this has knowledge of direction, ought to be a stack method */
522 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
523 }
524
525 uintptr_t self_raw_id() { return _self_raw_id; }
526 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
527
528 int lgrp_id() const { return _lgrp_id; }
529 void set_lgrp_id(int value) { _lgrp_id = value; }
530
531 // Printing
532 virtual void print_on(outputStream* st) const;
533 void print() const { print_on(tty); }
534 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
535
536 // Debug-only code
537 #ifdef ASSERT
538 private:
539 // Deadlock detection support for Mutex locks. List of locks own by thread.
540 Monitor* _owned_locks;
541 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
542 // thus the friendship
543 friend class Mutex;
544 friend class Monitor;
545
546 public:
547 void print_owned_locks_on(outputStream* st) const;
548 void print_owned_locks() const { print_owned_locks_on(tty); }
549 Monitor* owned_locks() const { return _owned_locks; }
550 bool owns_locks() const { return owned_locks() != NULL; }
551 bool owns_locks_but_compiled_lock() const;
552
553 // Deadlock detection
554 bool allow_allocation() { return _allow_allocation_count == 0; }
555 ResourceMark* current_resource_mark() { return _current_resource_mark; }
556 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
557 #endif
558
559 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
560
561 private:
562 volatile int _jvmti_env_iteration_count;
563
564 public:
565 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
566 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
567 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
568
569 // Code generation
570 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
571 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
572 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
573
574 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
575 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
576
577 #define TLAB_FIELD_OFFSET(name) \
578 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
579
580 TLAB_FIELD_OFFSET(start)
581 TLAB_FIELD_OFFSET(end)
582 TLAB_FIELD_OFFSET(top)
583 TLAB_FIELD_OFFSET(pf_top)
584 TLAB_FIELD_OFFSET(size) // desired_size
585 TLAB_FIELD_OFFSET(refill_waste_limit)
586 TLAB_FIELD_OFFSET(number_of_refills)
587 TLAB_FIELD_OFFSET(fast_refill_waste)
588 TLAB_FIELD_OFFSET(slow_allocations)
589
590 #undef TLAB_FIELD_OFFSET
591
592 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
593
594 public:
595 volatile intptr_t _Stalled ;
596 volatile int _TypeTag ;
597 ParkEvent * _ParkEvent ; // for synchronized()
598 ParkEvent * _SleepEvent ; // for Thread.sleep
599 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
600 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
601 int NativeSyncRecursion ; // diagnostic
602
603 volatile int _OnTrap ; // Resume-at IP delta
604 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
605 jint _hashStateX ; // thread-specific hashCode generator state
606 jint _hashStateY ;
607 jint _hashStateZ ;
608 void * _schedctl ;
609
610
611 volatile jint rng [4] ; // RNG for spin loop
612
613 // Low-level leaf-lock primitives used to implement synchronization
614 // and native monitor-mutex infrastructure.
615 // Not for general synchronization use.
616 static void SpinAcquire (volatile int * Lock, const char * Name) ;
617 static void SpinRelease (volatile int * Lock) ;
618 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
619 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
620 static void muxRelease (volatile intptr_t * Lock) ;
621 };
622
623 // Inline implementation of Thread::current()
624 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
625 // startup.
626 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
627 // period. This is inlined in thread_<os_family>.inline.hpp.
628
629 inline Thread* Thread::current() {
630 #ifdef ASSERT
631 // This function is very high traffic. Define PARANOID to enable expensive
632 // asserts.
633 #ifdef PARANOID
634 // Signal handler should call ThreadLocalStorage::get_thread_slow()
635 Thread* t = ThreadLocalStorage::get_thread_slow();
636 assert(t != NULL && !t->is_inside_signal_handler(),
637 "Don't use Thread::current() inside signal handler");
638 #endif
639 #endif
640 Thread* thread = ThreadLocalStorage::thread();
641 assert(thread != NULL, "just checking");
642 return thread;
643 }
644
645 // Name support for threads. non-JavaThread subclasses with multiple
646 // uniquely named instances should derive from this.
647 class NamedThread: public Thread {
648 friend class VMStructs;
649 enum {
650 max_name_len = 64
651 };
652 private:
653 char* _name;
654 // log JavaThread being processed by oops_do
655 JavaThread* _processed_thread;
656
657 public:
658 NamedThread();
659 ~NamedThread();
660 // May only be called once per thread.
661 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
662 virtual bool is_Named_thread() const { return true; }
663 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
664 JavaThread *processed_thread() { return _processed_thread; }
665 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
666 virtual void print_on(outputStream* st) const;
667 };
668
669 // Worker threads are named and have an id of an assigned work.
670 class WorkerThread: public NamedThread {
671 private:
672 uint _id;
673 public:
674 WorkerThread() : _id(0) { }
675 virtual bool is_Worker_thread() const { return true; }
676
677 virtual WorkerThread* as_Worker_thread() const {
678 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
679 return (WorkerThread*) this;
680 }
681
682 void set_id(uint work_id) { _id = work_id; }
683 uint id() const { return _id; }
684 };
685
686 // A single WatcherThread is used for simulating timer interrupts.
687 class WatcherThread: public Thread {
688 friend class VMStructs;
689 public:
690 virtual void run();
691
692 private:
693 static WatcherThread* _watcher_thread;
694
695 static bool _startable;
696 volatile static bool _should_terminate; // updated without holding lock
697
698 os::WatcherThreadCrashProtection* _crash_protection;
699 public:
700 enum SomeConstants {
701 delay_interval = 10 // interrupt delay in milliseconds
702 };
703
704 // Constructor
705 WatcherThread();
706
707 // Tester
708 bool is_Watcher_thread() const { return true; }
709
710 // Printing
711 char* name() const { return (char*)"VM Periodic Task Thread"; }
712 void print_on(outputStream* st) const;
713 void unpark();
714
715 // Returns the single instance of WatcherThread
716 static WatcherThread* watcher_thread() { return _watcher_thread; }
717
718 // Create and start the single instance of WatcherThread, or stop it on shutdown
719 static void start();
720 static void stop();
721 // Only allow start once the VM is sufficiently initialized
722 // Otherwise the first task to enroll will trigger the start
723 static void make_startable();
724
725 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
726 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
727 _crash_protection = crash_protection;
728 }
729
730 bool has_crash_protection() const { return _crash_protection != NULL; }
731 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
732
733 private:
734 int sleep() const;
735 };
736
737
738 class CompilerThread;
739
740 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
741
742 class JavaThread: public Thread {
743 friend class VMStructs;
744 private:
745 JavaThread* _next; // The next thread in the Threads list
746 oop _threadObj; // The Java level thread object
747
748 #ifdef ASSERT
749 private:
750 int _java_call_counter;
751
752 public:
753 int java_call_counter() { return _java_call_counter; }
754 void inc_java_call_counter() { _java_call_counter++; }
755 void dec_java_call_counter() {
756 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
757 _java_call_counter--;
758 }
759 private: // restore original namespace restriction
760 #endif // ifdef ASSERT
761
762 #ifndef PRODUCT
763 public:
764 enum {
765 jump_ring_buffer_size = 16
766 };
767 private: // restore original namespace restriction
768 #endif
769
770 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
771
772 ThreadFunction _entry_point;
773
774 JNIEnv _jni_environment;
775
776 // Deopt support
777 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
778
779 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
780 // transition out of native
781 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
782 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
783 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
784 // Because deoptimization is lazy we must save jvmti requests to set locals
785 // in compiled frames until we deoptimize and we have an interpreter frame.
786 // This holds the pointer to array (yeah like there might be more than one) of
787 // description of compiled vframes that have locals that need to be updated.
788 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
789
790 // Handshake value for fixing 6243940. We need a place for the i2c
791 // adapter to store the callee Method*. This value is NEVER live
792 // across a gc point so it does NOT have to be gc'd
793 // The handshake is open ended since we can't be certain that it will
794 // be NULLed. This is because we rarely ever see the race and end up
795 // in handle_wrong_method which is the backend of the handshake. See
796 // code in i2c adapters and handle_wrong_method.
797
798 Method* _callee_target;
799
800 // Used to pass back results to the interpreter or generated code running Java code.
801 oop _vm_result; // oop result is GC-preserved
802 Metadata* _vm_result_2; // non-oop result
803
804 // See ReduceInitialCardMarks: this holds the precise space interval of
805 // the most recent slow path allocation for which compiled code has
806 // elided card-marks for performance along the fast-path.
807 MemRegion _deferred_card_mark;
808
809 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
810 // allocated during deoptimization
811 // and by JNI_MonitorEnter/Exit
812
813 // Async. requests support
814 enum AsyncRequests {
815 _no_async_condition = 0,
816 _async_exception,
817 _async_unsafe_access_error
818 };
819 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
820 oop _pending_async_exception;
821
822 // Safepoint support
823 public: // Expose _thread_state for SafeFetchInt()
824 volatile JavaThreadState _thread_state;
825 private:
826 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
827 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
828
829 // JavaThread termination support
830 enum TerminatedTypes {
831 _not_terminated = 0xDEAD - 2,
832 _thread_exiting, // JavaThread::exit() has been called for this thread
833 _thread_terminated, // JavaThread is removed from thread list
834 _vm_exited // JavaThread is still executing native code, but VM is terminated
835 // only VM_Exit can set _vm_exited
836 };
837
838 // In general a JavaThread's _terminated field transitions as follows:
839 //
840 // _not_terminated => _thread_exiting => _thread_terminated
841 //
842 // _vm_exited is a special value to cover the case of a JavaThread
843 // executing native code after the VM itself is terminated.
844 volatile TerminatedTypes _terminated;
845 // suspend/resume support
846 volatile bool _suspend_equivalent; // Suspend equivalent condition
847 jint _in_deopt_handler; // count of deoptimization
848 // handlers thread is in
849 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
850 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
851 // never locked) when throwing an exception. Used by interpreter only.
852
853 // JNI attach states:
854 enum JNIAttachStates {
855 _not_attaching_via_jni = 1, // thread is not attaching via JNI
856 _attaching_via_jni, // thread is attaching via JNI
857 _attached_via_jni // thread has attached via JNI
858 };
859
860 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
861 // A native thread that is attaching via JNI starts with a value
862 // of _attaching_via_jni and transitions to _attached_via_jni.
863 volatile JNIAttachStates _jni_attach_state;
864
865 public:
866 // State of the stack guard pages for this thread.
867 enum StackGuardState {
868 stack_guard_unused, // not needed
869 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
870 stack_guard_enabled // enabled
871 };
872
873 private:
874
875 StackGuardState _stack_guard_state;
876
877 // Precompute the limit of the stack as used in stack overflow checks.
878 // We load it from here to simplify the stack overflow check in assembly.
879 address _stack_overflow_limit;
880
881 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
882 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
883 // code)
884 volatile oop _exception_oop; // Exception thrown in compiled code
885 volatile address _exception_pc; // PC where exception happened
886 volatile address _exception_handler_pc; // PC for handler of exception
887 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
888
889 // support for JNI critical regions
890 jint _jni_active_critical; // count of entries into JNI critical region
891
892 // For deadlock detection.
893 int _depth_first_number;
894
895 // JVMTI PopFrame support
896 // This is set to popframe_pending to signal that top Java frame should be popped immediately
897 int _popframe_condition;
898
899 #ifndef PRODUCT
900 int _jmp_ring_index;
901 struct {
902 // We use intptr_t instead of address so debugger doesn't try and display strings
903 intptr_t _target;
904 intptr_t _instruction;
905 const char* _file;
906 int _line;
907 } _jmp_ring[ jump_ring_buffer_size ];
908 #endif /* PRODUCT */
909
910 #if INCLUDE_ALL_GCS
911 // Support for G1 barriers
912
913 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
914 // Set of all such queues.
915 static SATBMarkQueueSet _satb_mark_queue_set;
916
917 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
918 // Set of all such queues.
919 static DirtyCardQueueSet _dirty_card_queue_set;
920
921 void flush_barrier_queues();
922 #endif // INCLUDE_ALL_GCS
923
924 friend class VMThread;
925 friend class ThreadWaitTransition;
926 friend class VM_Exit;
927
928 void initialize(); // Initialized the instance variables
929
930 public:
931 // Constructor
932 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
933 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
934 ~JavaThread();
935
936 #ifdef ASSERT
937 // verify this JavaThread hasn't be published in the Threads::list yet
938 void verify_not_published();
939 #endif
940
941 //JNI functiontable getter/setter for JVMTI jni function table interception API.
942 void set_jni_functions(struct JNINativeInterface_* functionTable) {
943 _jni_environment.functions = functionTable;
944 }
945 struct JNINativeInterface_* get_jni_functions() {
946 return (struct JNINativeInterface_ *)_jni_environment.functions;
947 }
948
949 // This function is called at thread creation to allow
950 // platform specific thread variables to be initialized.
951 void cache_global_variables();
952
953 // Executes Shutdown.shutdown()
954 void invoke_shutdown_hooks();
955
956 // Cleanup on thread exit
957 enum ExitType {
958 normal_exit,
959 jni_detach
960 };
961 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
962
963 void cleanup_failed_attach_current_thread();
964
965 // Testers
966 virtual bool is_Java_thread() const { return true; }
967
968 // Thread chain operations
969 JavaThread* next() const { return _next; }
970 void set_next(JavaThread* p) { _next = p; }
971
972 // Thread oop. threadObj() can be NULL for initial JavaThread
973 // (or for threads attached via JNI)
974 oop threadObj() const { return _threadObj; }
975 void set_threadObj(oop p) { _threadObj = p; }
976
977 ThreadPriority java_priority() const; // Read from threadObj()
978
979 // Prepare thread and add to priority queue. If a priority is
980 // not specified, use the priority of the thread object. Threads_lock
981 // must be held while this function is called.
982 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
983
984 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
985 address saved_exception_pc() { return _saved_exception_pc; }
986
987
988 ThreadFunction entry_point() const { return _entry_point; }
989
990 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
991 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
992
993 // Last frame anchor routines
994
995 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
996
997 // last_Java_sp
998 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
999 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1000
1001 // last_Java_pc
1002
1003 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1004
1005 // Safepoint support
1006 #ifndef PPC64
1007 JavaThreadState thread_state() const { return _thread_state; }
1008 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1009 #else
1010 // Use membars when accessing volatile _thread_state. See
1011 // Threads::create_vm() for size checks.
1012 inline JavaThreadState thread_state() const;
1013 inline void set_thread_state(JavaThreadState s);
1014 #endif
1015 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1016 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1017 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1018
1019 // thread has called JavaThread::exit() or is terminated
1020 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1021 // thread is terminated (no longer on the threads list); we compare
1022 // against the two non-terminated values so that a freed JavaThread
1023 // will also be considered terminated.
1024 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1025 void set_terminated(TerminatedTypes t) { _terminated = t; }
1026 // special for Threads::remove() which is static:
1027 void set_terminated_value() { _terminated = _thread_terminated; }
1028 void block_if_vm_exited();
1029
1030 bool doing_unsafe_access() { return _doing_unsafe_access; }
1031 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1032
1033 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1034 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1035
1036 #if INCLUDE_NMT
1037 // native memory tracking
1038 inline MemRecorder* get_recorder() const { return (MemRecorder*)_recorder; }
1039 inline void set_recorder(MemRecorder* rc) { _recorder = rc; }
1040
1041 private:
1042 // per-thread memory recorder
1043 MemRecorder* volatile _recorder;
1044 #endif // INCLUDE_NMT
1045
1046 // Suspend/resume support for JavaThread
1047 private:
1048 inline void set_ext_suspended();
1049 inline void clear_ext_suspended();
1050
1051 public:
1052 void java_suspend();
1053 void java_resume();
1054 int java_suspend_self();
1055
1056 void check_and_wait_while_suspended() {
1057 assert(JavaThread::current() == this, "sanity check");
1058
1059 bool do_self_suspend;
1060 do {
1061 // were we externally suspended while we were waiting?
1062 do_self_suspend = handle_special_suspend_equivalent_condition();
1063 if (do_self_suspend) {
1064 // don't surprise the thread that suspended us by returning
1065 java_suspend_self();
1066 set_suspend_equivalent();
1067 }
1068 } while (do_self_suspend);
1069 }
1070 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1071 // Check for async exception in addition to safepoint and suspend request.
1072 static void check_special_condition_for_native_trans(JavaThread *thread);
1073
1074 // Same as check_special_condition_for_native_trans but finishes the
1075 // transition into thread_in_Java mode so that it can potentially
1076 // block.
1077 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1078
1079 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1080 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1081 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1082 // Warning: is_ext_suspend_completed() may temporarily drop the
1083 // SR_lock to allow the thread to reach a stable thread state if
1084 // it is currently in a transient thread state.
1085 return is_ext_suspend_completed(false /*!called_by_wait */,
1086 SuspendRetryDelay, bits);
1087 }
1088
1089 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1090 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1091 // passed as the count and delay parameters. Experiments with specific
1092 // calls to wait_for_ext_suspend_completion() can be done by passing
1093 // other values in the code. Experiments with all calls can be done
1094 // via the appropriate -XX options.
1095 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1096
1097 inline void set_external_suspend();
1098 inline void clear_external_suspend();
1099
1100 inline void set_deopt_suspend();
1101 inline void clear_deopt_suspend();
1102 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1103
1104 bool is_external_suspend() const {
1105 return (_suspend_flags & _external_suspend) != 0;
1106 }
1107 // Whenever a thread transitions from native to vm/java it must suspend
1108 // if external|deopt suspend is present.
1109 bool is_suspend_after_native() const {
1110 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1111 }
1112
1113 // external suspend request is completed
1114 bool is_ext_suspended() const {
1115 return (_suspend_flags & _ext_suspended) != 0;
1116 }
1117
1118 bool is_external_suspend_with_lock() const {
1119 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1120 return is_external_suspend();
1121 }
1122
1123 // Special method to handle a pending external suspend request
1124 // when a suspend equivalent condition lifts.
1125 bool handle_special_suspend_equivalent_condition() {
1126 assert(is_suspend_equivalent(),
1127 "should only be called in a suspend equivalence condition");
1128 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1129 bool ret = is_external_suspend();
1130 if (!ret) {
1131 // not about to self-suspend so clear suspend equivalence
1132 clear_suspend_equivalent();
1133 }
1134 // implied else:
1135 // We have a pending external suspend request so we leave the
1136 // suspend_equivalent flag set until java_suspend_self() sets
1137 // the ext_suspended flag and clears the suspend_equivalent
1138 // flag. This insures that wait_for_ext_suspend_completion()
1139 // will return consistent values.
1140 return ret;
1141 }
1142
1143 // utility methods to see if we are doing some kind of suspension
1144 bool is_being_ext_suspended() const {
1145 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1146 return is_ext_suspended() || is_external_suspend();
1147 }
1148
1149 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1150
1151 void set_suspend_equivalent() { _suspend_equivalent = true; };
1152 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1153
1154 // Thread.stop support
1155 void send_thread_stop(oop throwable);
1156 AsyncRequests clear_special_runtime_exit_condition() {
1157 AsyncRequests x = _special_runtime_exit_condition;
1158 _special_runtime_exit_condition = _no_async_condition;
1159 return x;
1160 }
1161
1162 // Are any async conditions present?
1163 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1164
1165 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1166
1167 // these next two are also used for self-suspension and async exception support
1168 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1169
1170 // Return true if JavaThread has an asynchronous condition or
1171 // if external suspension is requested.
1172 bool has_special_runtime_exit_condition() {
1173 // We call is_external_suspend() last since external suspend should
1174 // be less common. Because we don't use is_external_suspend_with_lock
1175 // it is possible that we won't see an asynchronous external suspend
1176 // request that has just gotten started, i.e., SR_lock grabbed but
1177 // _external_suspend field change either not made yet or not visible
1178 // yet. However, this is okay because the request is asynchronous and
1179 // we will see the new flag value the next time through. It's also
1180 // possible that the external suspend request is dropped after
1181 // we have checked is_external_suspend(), we will recheck its value
1182 // under SR_lock in java_suspend_self().
1183 return (_special_runtime_exit_condition != _no_async_condition) ||
1184 is_external_suspend() || is_deopt_suspend();
1185 }
1186
1187 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1188
1189 inline void set_pending_async_exception(oop e);
1190
1191 // Fast-locking support
1192 bool is_lock_owned(address adr) const;
1193
1194 // Accessors for vframe array top
1195 // The linked list of vframe arrays are sorted on sp. This means when we
1196 // unpack the head must contain the vframe array to unpack.
1197 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1198 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1199
1200 // Side structure for deferring update of java frame locals until deopt occurs
1201 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1202 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1203
1204 // These only really exist to make debugging deopt problems simpler
1205
1206 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1207 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1208
1209 // The special resourceMark used during deoptimization
1210
1211 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1212 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1213
1214 intptr_t* must_deopt_id() { return _must_deopt_id; }
1215 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1216 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1217
1218 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1219 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1220
1221 Method* callee_target() const { return _callee_target; }
1222 void set_callee_target (Method* x) { _callee_target = x; }
1223
1224 // Oop results of vm runtime calls
1225 oop vm_result() const { return _vm_result; }
1226 void set_vm_result (oop x) { _vm_result = x; }
1227
1228 Metadata* vm_result_2() const { return _vm_result_2; }
1229 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1230
1231 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1232 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1233
1234 // Exception handling for compiled methods
1235 oop exception_oop() const { return _exception_oop; }
1236 address exception_pc() const { return _exception_pc; }
1237 address exception_handler_pc() const { return _exception_handler_pc; }
1238 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1239
1240 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1241 void set_exception_pc(address a) { _exception_pc = a; }
1242 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1243 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1244
1245 void clear_exception_oop_and_pc() {
1246 set_exception_oop(NULL);
1247 set_exception_pc(NULL);
1248 }
1249
1250 // Stack overflow support
1251 inline size_t stack_available(address cur_sp);
1252 address stack_yellow_zone_base()
1253 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1254 size_t stack_yellow_zone_size()
1255 { return StackYellowPages * os::vm_page_size(); }
1256 address stack_red_zone_base()
1257 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1258 size_t stack_red_zone_size()
1259 { return StackRedPages * os::vm_page_size(); }
1260 bool in_stack_yellow_zone(address a)
1261 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1262 bool in_stack_red_zone(address a)
1263 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1264
1265 void create_stack_guard_pages();
1266 void remove_stack_guard_pages();
1267
1268 void enable_stack_yellow_zone();
1269 void disable_stack_yellow_zone();
1270 void enable_stack_red_zone();
1271 void disable_stack_red_zone();
1272
1273 inline bool stack_guard_zone_unused();
1274 inline bool stack_yellow_zone_disabled();
1275 inline bool stack_yellow_zone_enabled();
1276
1277 // Attempt to reguard the stack after a stack overflow may have occurred.
1278 // Returns true if (a) guard pages are not needed on this thread, (b) the
1279 // pages are already guarded, or (c) the pages were successfully reguarded.
1280 // Returns false if there is not enough stack space to reguard the pages, in
1281 // which case the caller should unwind a frame and try again. The argument
1282 // should be the caller's (approximate) sp.
1283 bool reguard_stack(address cur_sp);
1284 // Similar to above but see if current stackpoint is out of the guard area
1285 // and reguard if possible.
1286 bool reguard_stack(void);
1287
1288 address stack_overflow_limit() { return _stack_overflow_limit; }
1289 void set_stack_overflow_limit() {
1290 _stack_overflow_limit = _stack_base - _stack_size +
1291 ((StackShadowPages +
1292 StackYellowPages +
1293 StackRedPages) * os::vm_page_size());
1294 }
1295
1296 // Misc. accessors/mutators
1297 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1298 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1299 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1300
1301 #ifndef PRODUCT
1302 void record_jump(address target, address instr, const char* file, int line);
1303 #endif /* PRODUCT */
1304
1305 // For assembly stub generation
1306 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1307 #ifndef PRODUCT
1308 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1309 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1310 #endif /* PRODUCT */
1311 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1312 static ByteSize last_Java_sp_offset() {
1313 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1314 }
1315 static ByteSize last_Java_pc_offset() {
1316 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1317 }
1318 static ByteSize frame_anchor_offset() {
1319 return byte_offset_of(JavaThread, _anchor);
1320 }
1321 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1322 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1323 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1324 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1325 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1326 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1327 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1328 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1329 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1330 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1331 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1332 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1333 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1334
1335 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1336 static ByteSize should_post_on_exceptions_flag_offset() {
1337 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1338 }
1339
1340 #if INCLUDE_ALL_GCS
1341 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1342 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1343 #endif // INCLUDE_ALL_GCS
1344
1345 // Returns the jni environment for this thread
1346 JNIEnv* jni_environment() { return &_jni_environment; }
1347
1348 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1349 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1350 // Only return NULL if thread is off the thread list; starting to
1351 // exit should not return NULL.
1352 if (thread_from_jni_env->is_terminated()) {
1353 thread_from_jni_env->block_if_vm_exited();
1354 return NULL;
1355 } else {
1356 return thread_from_jni_env;
1357 }
1358 }
1359
1360 // JNI critical regions. These can nest.
1361 bool in_critical() { return _jni_active_critical > 0; }
1362 bool in_last_critical() { return _jni_active_critical == 1; }
1363 void enter_critical() { assert(Thread::current() == this ||
1364 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1365 "this must be current thread or synchronizing");
1366 _jni_active_critical++; }
1367 void exit_critical() { assert(Thread::current() == this,
1368 "this must be current thread");
1369 _jni_active_critical--;
1370 assert(_jni_active_critical >= 0,
1371 "JNI critical nesting problem?"); }
1372
1373 // For deadlock detection
1374 int depth_first_number() { return _depth_first_number; }
1375 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1376
1377 private:
1378 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1379
1380 public:
1381 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1382 void add_monitor_chunk(MonitorChunk* chunk);
1383 void remove_monitor_chunk(MonitorChunk* chunk);
1384 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1385 void inc_in_deopt_handler() { _in_deopt_handler++; }
1386 void dec_in_deopt_handler() {
1387 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1388 if (_in_deopt_handler > 0) { // robustness
1389 _in_deopt_handler--;
1390 }
1391 }
1392
1393 private:
1394 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1395
1396 public:
1397
1398 // Frame iteration; calls the function f for all frames on the stack
1399 void frames_do(void f(frame*, const RegisterMap*));
1400
1401 // Memory operations
1402 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1403
1404 // Sweeper operations
1405 void nmethods_do(CodeBlobClosure* cf);
1406
1407 // RedefineClasses Support
1408 void metadata_do(void f(Metadata*));
1409
1410 // Memory management operations
1411 void gc_epilogue();
1412 void gc_prologue();
1413
1414 // Misc. operations
1415 char* name() const { return (char*)get_thread_name(); }
1416 void print_on(outputStream* st) const;
1417 void print_value();
1418 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1419 void print_thread_state() const PRODUCT_RETURN;
1420 void print_on_error(outputStream* st, char* buf, int buflen) const;
1421 void verify();
1422 const char* get_thread_name() const;
1423 private:
1424 // factor out low-level mechanics for use in both normal and error cases
1425 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1426 public:
1427 const char* get_threadgroup_name() const;
1428 const char* get_parent_name() const;
1429
1430 // Accessing frames
1431 frame last_frame() {
1432 _anchor.make_walkable(this);
1433 return pd_last_frame();
1434 }
1435 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1436
1437 // Returns method at 'depth' java or native frames down the stack
1438 // Used for security checks
1439 Klass* security_get_caller_class(int depth);
1440
1441 // Print stack trace in external format
1442 void print_stack_on(outputStream* st);
1443 void print_stack() { print_stack_on(tty); }
1444
1445 // Print stack traces in various internal formats
1446 void trace_stack() PRODUCT_RETURN;
1447 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1448 void trace_frames() PRODUCT_RETURN;
1449 void trace_oops() PRODUCT_RETURN;
1450
1451 // Print an annotated view of the stack frames
1452 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1453 void validate_frame_layout() {
1454 print_frame_layout(0, true);
1455 }
1456
1457 // Returns the number of stack frames on the stack
1458 int depth() const;
1459
1460 // Function for testing deoptimization
1461 void deoptimize();
1462 void make_zombies();
1463
1464 void deoptimized_wrt_marked_nmethods();
1465
1466 // Profiling operation (see fprofile.cpp)
1467 public:
1468 bool profile_last_Java_frame(frame* fr);
1469
1470 private:
1471 ThreadProfiler* _thread_profiler;
1472 private:
1473 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1474 friend class FlatProfilerTask; // uses get_thread_profiler.
1475 friend class ThreadProfilerMark; // uses get_thread_profiler.
1476 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1477 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1478 ThreadProfiler* result = _thread_profiler;
1479 _thread_profiler = tp;
1480 return result;
1481 }
1482
1483 // NMT (Native memory tracking) support.
1484 // This flag helps NMT to determine if this JavaThread will be blocked
1485 // at safepoint. If not, ThreadCritical is needed for writing memory records.
1486 // JavaThread is only safepoint visible when it is in Threads' thread list,
1487 // it is not visible until it is added to the list and becomes invisible
1488 // once it is removed from the list.
1489 public:
1490 bool is_safepoint_visible() const { return _safepoint_visible; }
1491 void set_safepoint_visible(bool visible) { _safepoint_visible = visible; }
1492 private:
1493 bool _safepoint_visible;
1494
1495 // Static operations
1496 public:
1497 // Returns the running thread as a JavaThread
1498 static inline JavaThread* current();
1499
1500 // Returns the active Java thread. Do not use this if you know you are calling
1501 // from a JavaThread, as it's slower than JavaThread::current. If called from
1502 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1503 // operation. You may not want that either.
1504 static JavaThread* active();
1505
1506 inline CompilerThread* as_CompilerThread();
1507
1508 public:
1509 virtual void run();
1510 void thread_main_inner();
1511
1512 private:
1513 // PRIVILEGED STACK
1514 PrivilegedElement* _privileged_stack_top;
1515 GrowableArray<oop>* _array_for_gc;
1516 public:
1517
1518 // Returns the privileged_stack information.
1519 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1520 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1521 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1522
1523 public:
1524 // Thread local information maintained by JVMTI.
1525 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1526 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1527 // getter is used to get this JavaThread's JvmtiThreadState if it has
1528 // one which means NULL can be returned. JvmtiThreadState::state_for()
1529 // is used to get the specified JavaThread's JvmtiThreadState if it has
1530 // one or it allocates a new JvmtiThreadState for the JavaThread and
1531 // returns it. JvmtiThreadState::state_for() will return NULL only if
1532 // the specified JavaThread is exiting.
1533 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1534 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1535 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1536 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1537
1538 // JVMTI PopFrame support
1539 // Setting and clearing popframe_condition
1540 // All of these enumerated values are bits. popframe_pending
1541 // indicates that a PopFrame() has been requested and not yet been
1542 // completed. popframe_processing indicates that that PopFrame() is in
1543 // the process of being completed. popframe_force_deopt_reexecution_bit
1544 // indicates that special handling is required when returning to a
1545 // deoptimized caller.
1546 enum PopCondition {
1547 popframe_inactive = 0x00,
1548 popframe_pending_bit = 0x01,
1549 popframe_processing_bit = 0x02,
1550 popframe_force_deopt_reexecution_bit = 0x04
1551 };
1552 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1553 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1554 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1555 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1556 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1557 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1558 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1559 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1560 #ifdef CC_INTERP
1561 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1562 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1563 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1564 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1565 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1566 #endif
1567
1568 private:
1569 // Saved incoming arguments to popped frame.
1570 // Used only when popped interpreted frame returns to deoptimized frame.
1571 void* _popframe_preserved_args;
1572 int _popframe_preserved_args_size;
1573
1574 public:
1575 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1576 void* popframe_preserved_args();
1577 ByteSize popframe_preserved_args_size();
1578 WordSize popframe_preserved_args_size_in_words();
1579 void popframe_free_preserved_args();
1580
1581
1582 private:
1583 JvmtiThreadState *_jvmti_thread_state;
1584 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1585
1586 // Used by the interpreter in fullspeed mode for frame pop, method
1587 // entry, method exit and single stepping support. This field is
1588 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1589 // It can be set to zero asynchronously (i.e., without a VM operation
1590 // or a lock) so we have to be very careful.
1591 int _interp_only_mode;
1592
1593 public:
1594 // used by the interpreter for fullspeed debugging support (see above)
1595 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1596 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1597 int get_interp_only_mode() { return _interp_only_mode; }
1598 void increment_interp_only_mode() { ++_interp_only_mode; }
1599 void decrement_interp_only_mode() { --_interp_only_mode; }
1600
1601 // support for cached flag that indicates whether exceptions need to be posted for this thread
1602 // if this is false, we can avoid deoptimizing when events are thrown
1603 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1604 private:
1605 int _should_post_on_exceptions_flag;
1606
1607 public:
1608 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1609 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1610
1611 private:
1612 ThreadStatistics *_thread_stat;
1613
1614 public:
1615 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1616
1617 // Return a blocker object for which this thread is blocked parking.
1618 oop current_park_blocker();
1619
1620 private:
1621 static size_t _stack_size_at_create;
1622
1623 public:
1624 static inline size_t stack_size_at_create(void) {
1625 return _stack_size_at_create;
1626 }
1627 static inline void set_stack_size_at_create(size_t value) {
1628 _stack_size_at_create = value;
1629 }
1630
1631 #if INCLUDE_ALL_GCS
1632 // SATB marking queue support
1633 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1634 static SATBMarkQueueSet& satb_mark_queue_set() {
1635 return _satb_mark_queue_set;
1636 }
1637
1638 // Dirty card queue support
1639 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1640 static DirtyCardQueueSet& dirty_card_queue_set() {
1641 return _dirty_card_queue_set;
1642 }
1643 #endif // INCLUDE_ALL_GCS
1644
1645 // This method initializes the SATB and dirty card queues before a
1646 // JavaThread is added to the Java thread list. Right now, we don't
1647 // have to do anything to the dirty card queue (it should have been
1648 // activated when the thread was created), but we have to activate
1649 // the SATB queue if the thread is created while a marking cycle is
1650 // in progress. The activation / de-activation of the SATB queues at
1651 // the beginning / end of a marking cycle is done during safepoints
1652 // so we have to make sure this method is called outside one to be
1653 // able to safely read the active field of the SATB queue set. Right
1654 // now, it is called just before the thread is added to the Java
1655 // thread list in the Threads::add() method. That method is holding
1656 // the Threads_lock which ensures we are outside a safepoint. We
1657 // cannot do the obvious and set the active field of the SATB queue
1658 // when the thread is created given that, in some cases, safepoints
1659 // might happen between the JavaThread constructor being called and the
1660 // thread being added to the Java thread list (an example of this is
1661 // when the structure for the DestroyJavaVM thread is created).
1662 #if INCLUDE_ALL_GCS
1663 void initialize_queues();
1664 #else // INCLUDE_ALL_GCS
1665 void initialize_queues() { }
1666 #endif // INCLUDE_ALL_GCS
1667
1668 // Machine dependent stuff
1669 #ifdef TARGET_OS_ARCH_linux_x86
1670 # include "thread_linux_x86.hpp"
1671 #endif
1672 #ifdef TARGET_OS_ARCH_linux_sparc
1673 # include "thread_linux_sparc.hpp"
1674 #endif
1675 #ifdef TARGET_OS_ARCH_linux_zero
1676 # include "thread_linux_zero.hpp"
1677 #endif
1678 #ifdef TARGET_OS_ARCH_solaris_x86
1679 # include "thread_solaris_x86.hpp"
1680 #endif
1681 #ifdef TARGET_OS_ARCH_solaris_sparc
1682 # include "thread_solaris_sparc.hpp"
1683 #endif
1684 #ifdef TARGET_OS_ARCH_windows_x86
1685 # include "thread_windows_x86.hpp"
1686 #endif
1687 #ifdef TARGET_OS_ARCH_linux_arm
1688 # include "thread_linux_arm.hpp"
1689 #endif
1690 #ifdef TARGET_OS_ARCH_linux_ppc
1691 # include "thread_linux_ppc.hpp"
1692 #endif
1693 #ifdef TARGET_OS_ARCH_aix_ppc
1694 # include "thread_aix_ppc.hpp"
1695 #endif
1696 #ifdef TARGET_OS_ARCH_bsd_x86
1697 # include "thread_bsd_x86.hpp"
1698 #endif
1699 #ifdef TARGET_OS_ARCH_bsd_zero
1700 # include "thread_bsd_zero.hpp"
1701 #endif
1702
1703
1704 public:
1705 void set_blocked_on_compilation(bool value) {
1706 _blocked_on_compilation = value;
1707 }
1708
1709 bool blocked_on_compilation() {
1710 return _blocked_on_compilation;
1711 }
1712 protected:
1713 bool _blocked_on_compilation;
1714
1715
1716 // JSR166 per-thread parker
1717 private:
1718 Parker* _parker;
1719 public:
1720 Parker* parker() { return _parker; }
1721
1722 // Biased locking support
1723 private:
1724 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1725 public:
1726 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1727 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1728
1729 // clearing/querying jni attach status
1730 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1731 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1732 inline void set_done_attaching_via_jni();
1733 private:
1734 // This field is used to determine if a thread has claimed
1735 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1736 // otherwise its value is the par_id that has been claimed.
1737 uint _claimed_par_id;
1738 public:
1739 uint get_claimed_par_id() { return _claimed_par_id; }
1740 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1741 };
1742
1743 // Inline implementation of JavaThread::current
1744 inline JavaThread* JavaThread::current() {
1745 Thread* thread = ThreadLocalStorage::thread();
1746 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1747 return (JavaThread*)thread;
1748 }
1749
1750 inline CompilerThread* JavaThread::as_CompilerThread() {
1751 assert(is_Compiler_thread(), "just checking");
1752 return (CompilerThread*)this;
1753 }
1754
1755 inline bool JavaThread::stack_guard_zone_unused() {
1756 return _stack_guard_state == stack_guard_unused;
1757 }
1758
1759 inline bool JavaThread::stack_yellow_zone_disabled() {
1760 return _stack_guard_state == stack_guard_yellow_disabled;
1761 }
1762
1763 inline bool JavaThread::stack_yellow_zone_enabled() {
1764 #ifdef ASSERT
1765 if (os::uses_stack_guard_pages()) {
1766 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1767 }
1768 #endif
1769 return _stack_guard_state == stack_guard_enabled;
1770 }
1771
1772 inline size_t JavaThread::stack_available(address cur_sp) {
1773 // This code assumes java stacks grow down
1774 address low_addr; // Limit on the address for deepest stack depth
1775 if ( _stack_guard_state == stack_guard_unused) {
1776 low_addr = stack_base() - stack_size();
1777 } else {
1778 low_addr = stack_yellow_zone_base();
1779 }
1780 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1781 }
1782
1783 // A thread used for Compilation.
1784 class CompilerThread : public JavaThread {
1785 friend class VMStructs;
1786 private:
1787 CompilerCounters* _counters;
1788
1789 ciEnv* _env;
1790 CompileLog* _log;
1791 CompileTask* _task;
1792 CompileQueue* _queue;
1793 BufferBlob* _buffer_blob;
1794
1795 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1796 AbstractCompiler* _compiler;
1797
1798 public:
1799
1800 static CompilerThread* current();
1801
1802 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1803
1804 bool is_Compiler_thread() const { return true; }
1805 // Hide this compiler thread from external view.
1806 bool is_hidden_from_external_view() const { return true; }
1807
1808 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1809 AbstractCompiler* compiler() const { return _compiler; }
1810
1811 CompileQueue* queue() const { return _queue; }
1812 CompilerCounters* counters() const { return _counters; }
1813
1814 // Get/set the thread's compilation environment.
1815 ciEnv* env() { return _env; }
1816 void set_env(ciEnv* env) { _env = env; }
1817
1818 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1819 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1820
1821 // Get/set the thread's logging information
1822 CompileLog* log() { return _log; }
1823 void init_log(CompileLog* log) {
1824 // Set once, for good.
1825 assert(_log == NULL, "set only once");
1826 _log = log;
1827 }
1828
1829 // GC support
1830 // Apply "f->do_oop" to all root oops in "this".
1831 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1832 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1833
1834 #ifndef PRODUCT
1835 private:
1836 IdealGraphPrinter *_ideal_graph_printer;
1837 public:
1838 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1839 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1840 #endif
1841
1842 // Get/set the thread's current task
1843 CompileTask* task() { return _task; }
1844 void set_task(CompileTask* task) { _task = task; }
1845
1846 // Track the nmethod currently being scanned by the sweeper
1847 void set_scanned_nmethod(nmethod* nm) {
1848 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1849 _scanned_nmethod = nm;
1850 }
1851 };
1852
1853 inline CompilerThread* CompilerThread::current() {
1854 return JavaThread::current()->as_CompilerThread();
1855 }
1856
1857
1858 // The active thread queue. It also keeps track of the current used
1859 // thread priorities.
1860 class Threads: AllStatic {
1861 friend class VMStructs;
1862 private:
1863 static JavaThread* _thread_list;
1864 static int _number_of_threads;
1865 static int _number_of_non_daemon_threads;
1866 static int _return_code;
1867 #ifdef ASSERT
1868 static bool _vm_complete;
1869 #endif
1870
1871 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
1872 static void initialize_jsr292_core_classes(TRAPS);
1873 public:
1874 // Thread management
1875 // force_daemon is a concession to JNI, where we may need to add a
1876 // thread to the thread list before allocating its thread object
1877 static void add(JavaThread* p, bool force_daemon = false);
1878 static void remove(JavaThread* p);
1879 static bool includes(JavaThread* p);
1880 static JavaThread* first() { return _thread_list; }
1881 static void threads_do(ThreadClosure* tc);
1882
1883 // Initializes the vm and creates the vm thread
1884 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1885 static void convert_vm_init_libraries_to_agents();
1886 static void create_vm_init_libraries();
1887 static void create_vm_init_agents();
1888 static void shutdown_vm_agents();
1889 static bool destroy_vm();
1890 // Supported VM versions via JNI
1891 // Includes JNI_VERSION_1_1
1892 static jboolean is_supported_jni_version_including_1_1(jint version);
1893 // Does not include JNI_VERSION_1_1
1894 static jboolean is_supported_jni_version(jint version);
1895
1896 // Garbage collection
1897 static void follow_other_roots(void f(oop*));
1898
1899 // Apply "f->do_oop" to all root oops in all threads.
1900 // This version may only be called by sequential code.
1901 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1902 // This version may be called by sequential or parallel code.
1903 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1904 // This creates a list of GCTasks, one per thread.
1905 static void create_thread_roots_tasks(GCTaskQueue* q);
1906 // This creates a list of GCTasks, one per thread, for marking objects.
1907 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1908
1909 // Apply "f->do_oop" to roots in all threads that
1910 // are part of compiled frames
1911 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1912
1913 static void convert_hcode_pointers();
1914 static void restore_hcode_pointers();
1915
1916 // Sweeper
1917 static void nmethods_do(CodeBlobClosure* cf);
1918
1919 // RedefineClasses support
1920 static void metadata_do(void f(Metadata*));
1921
1922 static void gc_epilogue();
1923 static void gc_prologue();
1924 #ifdef ASSERT
1925 static bool is_vm_complete() { return _vm_complete; }
1926 #endif
1927
1928 // Verification
1929 static void verify();
1930 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1931 static void print(bool print_stacks, bool internal_format) {
1932 // this function is only used by debug.cpp
1933 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1934 }
1935 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1936
1937 // Get Java threads that are waiting to enter a monitor. If doLock
1938 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1939 // VM needs to be at a safepoint.
1940 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1941 address monitor, bool doLock);
1942
1943 // Get owning Java thread from the monitor's owner field. If doLock
1944 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1945 // VM needs to be at a safepoint.
1946 static JavaThread *owning_thread_from_monitor_owner(address owner,
1947 bool doLock);
1948
1949 // Number of threads on the active threads list
1950 static int number_of_threads() { return _number_of_threads; }
1951 // Number of non-daemon threads on the active threads list
1952 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1953
1954 // Deoptimizes all frames tied to marked nmethods
1955 static void deoptimized_wrt_marked_nmethods();
1956
1957 };
1958
1959
1960 // Thread iterator
1961 class ThreadClosure: public StackObj {
1962 public:
1963 virtual void do_thread(Thread* thread) = 0;
1964 };
1965
1966 class SignalHandlerMark: public StackObj {
1967 private:
1968 Thread* _thread;
1969 public:
1970 SignalHandlerMark(Thread* t) {
1971 _thread = t;
1972 if (_thread) _thread->enter_signal_handler();
1973 }
1974 ~SignalHandlerMark() {
1975 if (_thread) _thread->leave_signal_handler();
1976 _thread = NULL;
1977 }
1978 };
1979
1980
1981 #endif // SHARE_VM_RUNTIME_THREAD_HPP