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