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