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 // Active_handles points to a block of handles
216 JNIHandleBlock* _active_handles;
217
218 // One-element thread local free list
219 JNIHandleBlock* _free_handle_block;
220
221 // Point to the last handle mark
222 HandleMark* _last_handle_mark;
223
224 // The parity of the last strong_roots iteration in which this thread was
225 // claimed as a task.
226 jint _oops_do_parity;
227
228 public:
229 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
230 HandleMark* last_handle_mark() const { return _last_handle_mark; }
231 private:
232
233 // debug support for checking if code does allow safepoints or not
234 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
235 // mutex, or blocking on an object synchronizer (Java locking).
236 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
237 // If !allow_allocation(), then an assertion failure will happen during allocation
238 // (Hence, !allow_safepoint() => !allow_allocation()).
239 //
240 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
241 //
242 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
243 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
244
245 // Used by SkipGCALot class.
246 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
247
248 friend class No_Alloc_Verifier;
249 friend class No_Safepoint_Verifier;
250 friend class Pause_No_Safepoint_Verifier;
251 friend class ThreadLocalStorage;
252 friend class GC_locker;
253
254 ThreadLocalAllocBuffer _tlab; // Thread-local eden
255 jlong _allocated_bytes; // Cumulative number of bytes allocated on
256 // the Java heap
257
258 // Thread-local buffer used by MetadataOnStackMark.
259 MetadataOnStackBuffer* _metadata_on_stack_buffer;
260
261 TRACE_DATA _trace_data; // Thread-local data for tracing
262
263 ThreadExt _ext;
264
265 int _vm_operation_started_count; // VM_Operation support
266 int _vm_operation_completed_count; // VM_Operation support
267
268 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
269 // is waiting to lock
270 bool _current_pending_monitor_is_from_java; // locking is from Java code
271
272 // ObjectMonitor on which this thread called Object.wait()
273 ObjectMonitor* _current_waiting_monitor;
274
275 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
276 public:
277 ObjectMonitor* omFreeList;
278 int omFreeCount; // length of omFreeList
279 int omFreeProvision; // reload chunk size
280 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
281 int omInUseCount; // length of omInUseList
282
283 #ifdef ASSERT
284 private:
285 bool _visited_for_critical_count;
286
287 public:
288 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
289 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
290 #endif
291
292 public:
293 enum {
294 is_definitely_current_thread = true
295 };
296
297 // Constructor
298 Thread();
299 virtual ~Thread();
300
301 // initializtion
302 void initialize_thread_local_storage();
303
304 // thread entry point
305 virtual void run();
306
307 // Testers
308 virtual bool is_VM_thread() const { return false; }
309 virtual bool is_Java_thread() const { return false; }
310 virtual bool is_Compiler_thread() const { return false; }
311 virtual bool is_Code_cache_sweeper_thread() const { return false; }
312 virtual bool is_hidden_from_external_view() const { return false; }
313 virtual bool is_jvmti_agent_thread() const { return false; }
314 // True iff the thread can perform GC operations at a safepoint.
315 // Generally will be true only of VM thread and parallel GC WorkGang
316 // threads.
317 virtual bool is_GC_task_thread() const { return false; }
318 virtual bool is_Watcher_thread() const { return false; }
319 virtual bool is_ConcurrentGC_thread() const { return false; }
320 virtual bool is_Named_thread() const { return false; }
321 virtual bool is_Worker_thread() const { return false; }
322
323 // Casts
324 virtual WorkerThread* as_Worker_thread() const { return NULL; }
325
326 virtual char* name() const { return (char*)"Unknown thread"; }
327
328 // Returns the current thread
329 static inline Thread* current();
330
331 // Common thread operations
332 static void set_priority(Thread* thread, ThreadPriority priority);
333 static ThreadPriority get_priority(const Thread* const thread);
334 static void start(Thread* thread);
335 static void interrupt(Thread* thr);
336 static bool is_interrupted(Thread* thr, bool clear_interrupted);
337
338 void set_native_thread_name(const char *name) {
339 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
340 os::set_native_thread_name(name);
341 }
342
343 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
344 Monitor* SR_lock() const { return _SR_lock; }
345
346 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
347
348 inline void set_suspend_flag(SuspendFlags f);
349 inline void clear_suspend_flag(SuspendFlags f);
350
351 inline void set_has_async_exception();
352 inline void clear_has_async_exception();
353
354 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
355
356 inline void set_critical_native_unlock();
357 inline void clear_critical_native_unlock();
358
359 // Support for Unhandled Oop detection
360 #ifdef CHECK_UNHANDLED_OOPS
361 private:
362 UnhandledOops* _unhandled_oops;
363 public:
364 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
365 // Mark oop safe for gc. It may be stack allocated but won't move.
366 void allow_unhandled_oop(oop *op) {
367 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
368 }
369 // Clear oops at safepoint so crashes point to unhandled oop violator
370 void clear_unhandled_oops() {
371 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
372 }
373 #endif // CHECK_UNHANDLED_OOPS
374
375 #ifndef PRODUCT
376 bool skip_gcalot() { return _skip_gcalot; }
377 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
378 #endif
379
380 public:
381 // Installs a pending exception to be inserted later
382 static void send_async_exception(oop thread_oop, oop java_throwable);
383
384 // Resource area
385 ResourceArea* resource_area() const { return _resource_area; }
386 void set_resource_area(ResourceArea* area) { _resource_area = area; }
387
388 OSThread* osthread() const { return _osthread; }
389 void set_osthread(OSThread* thread) { _osthread = thread; }
390
391 // JNI handle support
392 JNIHandleBlock* active_handles() const { return _active_handles; }
393 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
394 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
395 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
396
397 // Internal handle support
398 HandleArea* handle_area() const { return _handle_area; }
399 void set_handle_area(HandleArea* area) { _handle_area = area; }
400
401 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
402 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
403
404 // Thread-Local Allocation Buffer (TLAB) support
405 ThreadLocalAllocBuffer& tlab() { return _tlab; }
406 void initialize_tlab() {
407 if (UseTLAB) {
408 tlab().initialize();
409 }
410 }
411
412 jlong allocated_bytes() { return _allocated_bytes; }
413 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
414 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
415 inline jlong cooked_allocated_bytes();
416
417 TRACE_DATA* trace_data() { return &_trace_data; }
418
419 const ThreadExt& ext() const { return _ext; }
420 ThreadExt& ext() { return _ext; }
421
422 // VM operation support
423 int vm_operation_ticket() { return ++_vm_operation_started_count; }
424 int vm_operation_completed_count() { return _vm_operation_completed_count; }
425 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
426
427 // For tracking the heavyweight monitor the thread is pending on.
428 ObjectMonitor* current_pending_monitor() {
429 return _current_pending_monitor;
430 }
431 void set_current_pending_monitor(ObjectMonitor* monitor) {
432 _current_pending_monitor = monitor;
433 }
434 void set_current_pending_monitor_is_from_java(bool from_java) {
435 _current_pending_monitor_is_from_java = from_java;
436 }
437 bool current_pending_monitor_is_from_java() {
438 return _current_pending_monitor_is_from_java;
439 }
440
441 // For tracking the ObjectMonitor on which this thread called Object.wait()
442 ObjectMonitor* current_waiting_monitor() {
443 return _current_waiting_monitor;
444 }
445 void set_current_waiting_monitor(ObjectMonitor* monitor) {
446 _current_waiting_monitor = monitor;
447 }
448
449 // GC support
450 // Apply "f->do_oop" to all root oops in "this".
451 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
452 // Used by JavaThread::oops_do.
453 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
454 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
455
456 // Handles the parallel case for the method below.
457 private:
458 bool claim_oops_do_par_case(int collection_parity);
459 public:
460 // Requires that "collection_parity" is that of the current roots
461 // iteration. If "is_par" is false, sets the parity of "this" to
462 // "collection_parity", and returns "true". If "is_par" is true,
463 // uses an atomic instruction to set the current threads parity to
464 // "collection_parity", if it is not already. Returns "true" iff the
465 // calling thread does the update, this indicates that the calling thread
466 // has claimed the thread's stack as a root groop in the current
467 // collection.
468 bool claim_oops_do(bool is_par, int collection_parity) {
469 if (!is_par) {
470 _oops_do_parity = collection_parity;
471 return true;
472 } else {
473 return claim_oops_do_par_case(collection_parity);
474 }
475 }
476
477 // Sweeper support
478 void nmethods_do(CodeBlobClosure* cf);
479
480 // jvmtiRedefineClasses support
481 void metadata_do(void f(Metadata*));
482
483 // Used by fast lock support
484 virtual bool is_lock_owned(address adr) const;
485
486 // Check if address is in the stack of the thread (not just for locks).
487 // Warning: the method can only be used on the running thread
488 bool is_in_stack(address adr) const;
489 // Check if address is in the usable part of the stack (excludes protected
490 // guard pages)
491 bool is_in_usable_stack(address adr) const;
492
493 // Sets this thread as starting thread. Returns failure if thread
494 // creation fails due to lack of memory, too many threads etc.
495 bool set_as_starting_thread();
496
497 void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; }
498 MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; }
499
500 protected:
501 // OS data associated with the thread
502 OSThread* _osthread; // Platform-specific thread information
503
504 // Thread local resource area for temporary allocation within the VM
505 ResourceArea* _resource_area;
506
507 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
508
509 // Thread local handle area for allocation of handles within the VM
510 HandleArea* _handle_area;
511 GrowableArray<Metadata*>* _metadata_handles;
512
513 // Support for stack overflow handling, get_thread, etc.
514 address _stack_base;
515 size_t _stack_size;
516 uintptr_t _self_raw_id; // used by get_thread (mutable)
517 int _lgrp_id;
518
519 public:
520 // Stack overflow support
521 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
522
523 void set_stack_base(address base) { _stack_base = base; }
524 size_t stack_size() const { return _stack_size; }
525 void set_stack_size(size_t size) { _stack_size = size; }
526 void record_stack_base_and_size();
527
528 bool on_local_stack(address adr) const {
529 // QQQ this has knowledge of direction, ought to be a stack method
530 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
531 }
532
533 uintptr_t self_raw_id() { return _self_raw_id; }
534 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
535
536 int lgrp_id() const { return _lgrp_id; }
537 void set_lgrp_id(int value) { _lgrp_id = value; }
538
539 // Printing
540 virtual void print_on(outputStream* st) const;
541 void print() const { print_on(tty); }
542 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
543
544 // Debug-only code
545 #ifdef ASSERT
546 private:
547 // Deadlock detection support for Mutex locks. List of locks own by thread.
548 Monitor* _owned_locks;
549 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
550 // thus the friendship
551 friend class Mutex;
552 friend class Monitor;
553
554 public:
555 void print_owned_locks_on(outputStream* st) const;
556 void print_owned_locks() const { print_owned_locks_on(tty); }
557 Monitor* owned_locks() const { return _owned_locks; }
558 bool owns_locks() const { return owned_locks() != NULL; }
559 bool owns_locks_but_compiled_lock() const;
560
561 // Deadlock detection
562 bool allow_allocation() { return _allow_allocation_count == 0; }
563 ResourceMark* current_resource_mark() { return _current_resource_mark; }
564 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
565 #endif
566
567 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
568
569 private:
570 volatile int _jvmti_env_iteration_count;
571
572 public:
573 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
574 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
575 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
576
577 // Code generation
578 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
579 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
580 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
581
582 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
583 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
584
585 #define TLAB_FIELD_OFFSET(name) \
586 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
587
588 TLAB_FIELD_OFFSET(start)
589 TLAB_FIELD_OFFSET(end)
590 TLAB_FIELD_OFFSET(top)
591 TLAB_FIELD_OFFSET(pf_top)
592 TLAB_FIELD_OFFSET(size) // desired_size
593 TLAB_FIELD_OFFSET(refill_waste_limit)
594 TLAB_FIELD_OFFSET(number_of_refills)
595 TLAB_FIELD_OFFSET(fast_refill_waste)
596 TLAB_FIELD_OFFSET(slow_allocations)
597
598 #undef TLAB_FIELD_OFFSET
599
600 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
601
602 public:
603 volatile intptr_t _Stalled;
604 volatile int _TypeTag;
605 ParkEvent * _ParkEvent; // for synchronized()
606 ParkEvent * _SleepEvent; // for Thread.sleep
607 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
608 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
609 int NativeSyncRecursion; // diagnostic
610
611 volatile int _OnTrap; // Resume-at IP delta
612 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
613 jint _hashStateX; // thread-specific hashCode generator state
614 jint _hashStateY;
615 jint _hashStateZ;
616 void * _schedctl;
617
618
619 volatile jint rng[4]; // RNG for spin loop
620
621 // Low-level leaf-lock primitives used to implement synchronization
622 // and native monitor-mutex infrastructure.
623 // Not for general synchronization use.
624 static void SpinAcquire(volatile int * Lock, const char * Name);
625 static void SpinRelease(volatile int * Lock);
626 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
627 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
628 static void muxRelease(volatile intptr_t * Lock);
629 };
630
631 // Inline implementation of Thread::current()
632 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
633 // startup.
634 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
635 // period. This is inlined in thread_<os_family>.inline.hpp.
636
637 inline Thread* Thread::current() {
638 #ifdef ASSERT
639 // This function is very high traffic. Define PARANOID to enable expensive
640 // asserts.
641 #ifdef PARANOID
642 // Signal handler should call ThreadLocalStorage::get_thread_slow()
643 Thread* t = ThreadLocalStorage::get_thread_slow();
644 assert(t != NULL && !t->is_inside_signal_handler(),
645 "Don't use Thread::current() inside signal handler");
646 #endif
647 #endif
648 Thread* thread = ThreadLocalStorage::thread();
649 assert(thread != NULL, "just checking");
650 return thread;
651 }
652
653 // Name support for threads. non-JavaThread subclasses with multiple
654 // uniquely named instances should derive from this.
655 class NamedThread: public Thread {
656 friend class VMStructs;
657 enum {
658 max_name_len = 64
659 };
660 private:
661 char* _name;
662 // log JavaThread being processed by oops_do
663 JavaThread* _processed_thread;
664
665 public:
666 NamedThread();
667 ~NamedThread();
668 // May only be called once per thread.
669 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
670 virtual bool is_Named_thread() const { return true; }
671 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
672 JavaThread *processed_thread() { return _processed_thread; }
673 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
674 virtual void print_on(outputStream* st) const;
675 };
676
677 // Worker threads are named and have an id of an assigned work.
678 class WorkerThread: public NamedThread {
679 private:
680 uint _id;
681 public:
682 WorkerThread() : _id(0) { }
683 virtual bool is_Worker_thread() const { return true; }
684
685 virtual WorkerThread* as_Worker_thread() const {
686 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
687 return (WorkerThread*) this;
688 }
689
690 void set_id(uint work_id) { _id = work_id; }
691 uint id() const { return _id; }
692 };
693
694 // A single WatcherThread is used for simulating timer interrupts.
695 class WatcherThread: public Thread {
696 friend class VMStructs;
697 public:
698 virtual void run();
699
700 private:
701 static WatcherThread* _watcher_thread;
702
703 static bool _startable;
704 volatile static bool _should_terminate; // updated without holding lock
705
706 os::WatcherThreadCrashProtection* _crash_protection;
707 public:
708 enum SomeConstants {
709 delay_interval = 10 // interrupt delay in milliseconds
710 };
711
712 // Constructor
713 WatcherThread();
714
715 // Tester
716 bool is_Watcher_thread() const { return true; }
717
718 // Printing
719 char* name() const { return (char*)"VM Periodic Task Thread"; }
720 void print_on(outputStream* st) const;
721 void unpark();
722
723 // Returns the single instance of WatcherThread
724 static WatcherThread* watcher_thread() { return _watcher_thread; }
725
726 // Create and start the single instance of WatcherThread, or stop it on shutdown
727 static void start();
728 static void stop();
729 // Only allow start once the VM is sufficiently initialized
730 // Otherwise the first task to enroll will trigger the start
731 static void make_startable();
732
733 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
734 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
735 _crash_protection = crash_protection;
736 }
737
738 bool has_crash_protection() const { return _crash_protection != NULL; }
739 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
740
741 private:
742 int sleep() const;
743 };
744
745
746 class CompilerThread;
747
748 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
749
750 class JavaThread: public Thread {
751 friend class VMStructs;
752 friend class WhiteBox;
753 private:
754 JavaThread* _next; // The next thread in the Threads list
755 oop _threadObj; // The Java level thread object
756
757 #ifdef ASSERT
758 private:
759 int _java_call_counter;
760
761 public:
762 int java_call_counter() { return _java_call_counter; }
763 void inc_java_call_counter() { _java_call_counter++; }
764 void dec_java_call_counter() {
765 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
766 _java_call_counter--;
767 }
768 private: // restore original namespace restriction
769 #endif // ifdef ASSERT
770
771 #ifndef PRODUCT
772 public:
773 enum {
774 jump_ring_buffer_size = 16
775 };
776 private: // restore original namespace restriction
777 #endif
778
779 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
780
781 ThreadFunction _entry_point;
782
783 JNIEnv _jni_environment;
784
785 // Deopt support
786 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
787
788 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
789 // transition out of native
790 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
791 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
792 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
793 // Because deoptimization is lazy we must save jvmti requests to set locals
794 // in compiled frames until we deoptimize and we have an interpreter frame.
795 // This holds the pointer to array (yeah like there might be more than one) of
796 // description of compiled vframes that have locals that need to be updated.
797 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
798
799 // Handshake value for fixing 6243940. We need a place for the i2c
800 // adapter to store the callee Method*. This value is NEVER live
801 // across a gc point so it does NOT have to be gc'd
802 // The handshake is open ended since we can't be certain that it will
803 // be NULLed. This is because we rarely ever see the race and end up
804 // in handle_wrong_method which is the backend of the handshake. See
805 // code in i2c adapters and handle_wrong_method.
806
807 Method* _callee_target;
808
809 // Used to pass back results to the interpreter or generated code running Java code.
810 oop _vm_result; // oop result is GC-preserved
811 Metadata* _vm_result_2; // non-oop result
812
813 // See ReduceInitialCardMarks: this holds the precise space interval of
814 // the most recent slow path allocation for which compiled code has
815 // elided card-marks for performance along the fast-path.
816 MemRegion _deferred_card_mark;
817
818 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
819 // allocated during deoptimization
820 // and by JNI_MonitorEnter/Exit
821
822 // Async. requests support
823 enum AsyncRequests {
824 _no_async_condition = 0,
825 _async_exception,
826 _async_unsafe_access_error
827 };
828 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
829 oop _pending_async_exception;
830
831 // Safepoint support
832 public: // Expose _thread_state for SafeFetchInt()
833 volatile JavaThreadState _thread_state;
834 private:
835 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
836 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
837
838 // JavaThread termination support
839 enum TerminatedTypes {
840 _not_terminated = 0xDEAD - 2,
841 _thread_exiting, // JavaThread::exit() has been called for this thread
842 _thread_terminated, // JavaThread is removed from thread list
843 _vm_exited // JavaThread is still executing native code, but VM is terminated
844 // only VM_Exit can set _vm_exited
845 };
846
847 // In general a JavaThread's _terminated field transitions as follows:
848 //
849 // _not_terminated => _thread_exiting => _thread_terminated
850 //
851 // _vm_exited is a special value to cover the case of a JavaThread
852 // executing native code after the VM itself is terminated.
853 volatile TerminatedTypes _terminated;
854 // suspend/resume support
855 volatile bool _suspend_equivalent; // Suspend equivalent condition
856 jint _in_deopt_handler; // count of deoptimization
857 // handlers thread is in
858 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
859 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
860 // never locked) when throwing an exception. Used by interpreter only.
861
862 // JNI attach states:
863 enum JNIAttachStates {
864 _not_attaching_via_jni = 1, // thread is not attaching via JNI
865 _attaching_via_jni, // thread is attaching via JNI
866 _attached_via_jni // thread has attached via JNI
867 };
868
869 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
870 // A native thread that is attaching via JNI starts with a value
871 // of _attaching_via_jni and transitions to _attached_via_jni.
872 volatile JNIAttachStates _jni_attach_state;
873
874 public:
875 // State of the stack guard pages for this thread.
876 enum StackGuardState {
877 stack_guard_unused, // not needed
878 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
879 stack_guard_enabled // enabled
880 };
881
882 private:
883
884 StackGuardState _stack_guard_state;
885
886 // Precompute the limit of the stack as used in stack overflow checks.
887 // We load it from here to simplify the stack overflow check in assembly.
888 address _stack_overflow_limit;
889
890 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
891 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
892 // code)
893 volatile oop _exception_oop; // Exception thrown in compiled code
894 volatile address _exception_pc; // PC where exception happened
895 volatile address _exception_handler_pc; // PC for handler of exception
896 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
897
898 // support for JNI critical regions
899 jint _jni_active_critical; // count of entries into JNI critical region
900
901 // Checked JNI: function name requires exception check
902 char* _pending_jni_exception_check_fn;
903
904 // For deadlock detection.
905 int _depth_first_number;
906
907 // JVMTI PopFrame support
908 // This is set to popframe_pending to signal that top Java frame should be popped immediately
909 int _popframe_condition;
910
911 #ifndef PRODUCT
912 int _jmp_ring_index;
913 struct {
914 // We use intptr_t instead of address so debugger doesn't try and display strings
915 intptr_t _target;
916 intptr_t _instruction;
917 const char* _file;
918 int _line;
919 } _jmp_ring[jump_ring_buffer_size];
920 #endif // PRODUCT
921
922 #if INCLUDE_ALL_GCS
923 // Support for G1 barriers
924
925 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
926 // Set of all such queues.
927 static SATBMarkQueueSet _satb_mark_queue_set;
928
929 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
930 // Set of all such queues.
931 static DirtyCardQueueSet _dirty_card_queue_set;
932
933 void flush_barrier_queues();
934 #endif // INCLUDE_ALL_GCS
935
936 friend class VMThread;
937 friend class ThreadWaitTransition;
938 friend class VM_Exit;
939
940 void initialize(); // Initialized the instance variables
941
942 public:
943 // Constructor
944 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
945 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
946 ~JavaThread();
947
948 #ifdef ASSERT
949 // verify this JavaThread hasn't be published in the Threads::list yet
950 void verify_not_published();
951 #endif
952
953 //JNI functiontable getter/setter for JVMTI jni function table interception API.
954 void set_jni_functions(struct JNINativeInterface_* functionTable) {
955 _jni_environment.functions = functionTable;
956 }
957 struct JNINativeInterface_* get_jni_functions() {
958 return (struct JNINativeInterface_ *)_jni_environment.functions;
959 }
960
961 // This function is called at thread creation to allow
962 // platform specific thread variables to be initialized.
963 void cache_global_variables();
964
965 // Executes Shutdown.shutdown()
966 void invoke_shutdown_hooks();
967
968 // Cleanup on thread exit
969 enum ExitType {
970 normal_exit,
971 jni_detach
972 };
973 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
974
975 void cleanup_failed_attach_current_thread();
976
977 // Testers
978 virtual bool is_Java_thread() const { return true; }
979
980 // Thread chain operations
981 JavaThread* next() const { return _next; }
982 void set_next(JavaThread* p) { _next = p; }
983
984 // Thread oop. threadObj() can be NULL for initial JavaThread
985 // (or for threads attached via JNI)
986 oop threadObj() const { return _threadObj; }
987 void set_threadObj(oop p) { _threadObj = p; }
988
989 ThreadPriority java_priority() const; // Read from threadObj()
990
991 // Prepare thread and add to priority queue. If a priority is
992 // not specified, use the priority of the thread object. Threads_lock
993 // must be held while this function is called.
994 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
995 void prepare_ext();
996
997 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
998 address saved_exception_pc() { return _saved_exception_pc; }
999
1000
1001 ThreadFunction entry_point() const { return _entry_point; }
1002
1003 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1004 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1005
1006 // Last frame anchor routines
1007
1008 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1009
1010 // last_Java_sp
1011 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1012 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1013
1014 // last_Java_pc
1015
1016 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1017
1018 // Safepoint support
1019 #ifndef PPC64
1020 JavaThreadState thread_state() const { return _thread_state; }
1021 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1022 #else
1023 // Use membars when accessing volatile _thread_state. See
1024 // Threads::create_vm() for size checks.
1025 inline JavaThreadState thread_state() const;
1026 inline void set_thread_state(JavaThreadState s);
1027 #endif
1028 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1029 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1030 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1031
1032 // thread has called JavaThread::exit() or is terminated
1033 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1034 // thread is terminated (no longer on the threads list); we compare
1035 // against the two non-terminated values so that a freed JavaThread
1036 // will also be considered terminated.
1037 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1038 void set_terminated(TerminatedTypes t) { _terminated = t; }
1039 // special for Threads::remove() which is static:
1040 void set_terminated_value() { _terminated = _thread_terminated; }
1041 void block_if_vm_exited();
1042
1043 bool doing_unsafe_access() { return _doing_unsafe_access; }
1044 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1045
1046 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1047 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1048
1049 // Suspend/resume support for JavaThread
1050 private:
1051 inline void set_ext_suspended();
1052 inline void clear_ext_suspended();
1053
1054 public:
1055 void java_suspend();
1056 void java_resume();
1057 int java_suspend_self();
1058
1059 void check_and_wait_while_suspended() {
1060 assert(JavaThread::current() == this, "sanity check");
1061
1062 bool do_self_suspend;
1063 do {
1064 // were we externally suspended while we were waiting?
1065 do_self_suspend = handle_special_suspend_equivalent_condition();
1066 if (do_self_suspend) {
1067 // don't surprise the thread that suspended us by returning
1068 java_suspend_self();
1069 set_suspend_equivalent();
1070 }
1071 } while (do_self_suspend);
1072 }
1073 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1074 // Check for async exception in addition to safepoint and suspend request.
1075 static void check_special_condition_for_native_trans(JavaThread *thread);
1076
1077 // Same as check_special_condition_for_native_trans but finishes the
1078 // transition into thread_in_Java mode so that it can potentially
1079 // block.
1080 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1081
1082 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1083 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1084 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1085 // Warning: is_ext_suspend_completed() may temporarily drop the
1086 // SR_lock to allow the thread to reach a stable thread state if
1087 // it is currently in a transient thread state.
1088 return is_ext_suspend_completed(false /* !called_by_wait */,
1089 SuspendRetryDelay, bits);
1090 }
1091
1092 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1093 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1094 // passed as the count and delay parameters. Experiments with specific
1095 // calls to wait_for_ext_suspend_completion() can be done by passing
1096 // other values in the code. Experiments with all calls can be done
1097 // via the appropriate -XX options.
1098 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1099
1100 inline void set_external_suspend();
1101 inline void clear_external_suspend();
1102
1103 inline void set_deopt_suspend();
1104 inline void clear_deopt_suspend();
1105 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1106
1107 bool is_external_suspend() const {
1108 return (_suspend_flags & _external_suspend) != 0;
1109 }
1110 // Whenever a thread transitions from native to vm/java it must suspend
1111 // if external|deopt suspend is present.
1112 bool is_suspend_after_native() const {
1113 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1114 }
1115
1116 // external suspend request is completed
1117 bool is_ext_suspended() const {
1118 return (_suspend_flags & _ext_suspended) != 0;
1119 }
1120
1121 bool is_external_suspend_with_lock() const {
1122 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1123 return is_external_suspend();
1124 }
1125
1126 // Special method to handle a pending external suspend request
1127 // when a suspend equivalent condition lifts.
1128 bool handle_special_suspend_equivalent_condition() {
1129 assert(is_suspend_equivalent(),
1130 "should only be called in a suspend equivalence condition");
1131 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1132 bool ret = is_external_suspend();
1133 if (!ret) {
1134 // not about to self-suspend so clear suspend equivalence
1135 clear_suspend_equivalent();
1136 }
1137 // implied else:
1138 // We have a pending external suspend request so we leave the
1139 // suspend_equivalent flag set until java_suspend_self() sets
1140 // the ext_suspended flag and clears the suspend_equivalent
1141 // flag. This insures that wait_for_ext_suspend_completion()
1142 // will return consistent values.
1143 return ret;
1144 }
1145
1146 // utility methods to see if we are doing some kind of suspension
1147 bool is_being_ext_suspended() const {
1148 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1149 return is_ext_suspended() || is_external_suspend();
1150 }
1151
1152 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1153
1154 void set_suspend_equivalent() { _suspend_equivalent = true; }
1155 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1156
1157 // Thread.stop support
1158 void send_thread_stop(oop throwable);
1159 AsyncRequests clear_special_runtime_exit_condition() {
1160 AsyncRequests x = _special_runtime_exit_condition;
1161 _special_runtime_exit_condition = _no_async_condition;
1162 return x;
1163 }
1164
1165 // Are any async conditions present?
1166 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1167
1168 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1169
1170 // these next two are also used for self-suspension and async exception support
1171 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1172
1173 // Return true if JavaThread has an asynchronous condition or
1174 // if external suspension is requested.
1175 bool has_special_runtime_exit_condition() {
1176 // We call is_external_suspend() last since external suspend should
1177 // be less common. Because we don't use is_external_suspend_with_lock
1178 // it is possible that we won't see an asynchronous external suspend
1179 // request that has just gotten started, i.e., SR_lock grabbed but
1180 // _external_suspend field change either not made yet or not visible
1181 // yet. However, this is okay because the request is asynchronous and
1182 // we will see the new flag value the next time through. It's also
1183 // possible that the external suspend request is dropped after
1184 // we have checked is_external_suspend(), we will recheck its value
1185 // under SR_lock in java_suspend_self().
1186 return (_special_runtime_exit_condition != _no_async_condition) ||
1187 is_external_suspend() || is_deopt_suspend();
1188 }
1189
1190 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1191
1192 inline void set_pending_async_exception(oop e);
1193
1194 // Fast-locking support
1195 bool is_lock_owned(address adr) const;
1196
1197 // Accessors for vframe array top
1198 // The linked list of vframe arrays are sorted on sp. This means when we
1199 // unpack the head must contain the vframe array to unpack.
1200 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1201 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1202
1203 // Side structure for deferring update of java frame locals until deopt occurs
1204 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1205 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1206
1207 // These only really exist to make debugging deopt problems simpler
1208
1209 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1210 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1211
1212 // The special resourceMark used during deoptimization
1213
1214 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1215 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1216
1217 intptr_t* must_deopt_id() { return _must_deopt_id; }
1218 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1219 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1220
1221 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1222 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1223
1224 Method* callee_target() const { return _callee_target; }
1225 void set_callee_target (Method* x) { _callee_target = x; }
1226
1227 // Oop results of vm runtime calls
1228 oop vm_result() const { return _vm_result; }
1229 void set_vm_result (oop x) { _vm_result = x; }
1230
1231 Metadata* vm_result_2() const { return _vm_result_2; }
1232 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1233
1234 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1235 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1236
1237 // Exception handling for compiled methods
1238 oop exception_oop() const { return _exception_oop; }
1239 address exception_pc() const { return _exception_pc; }
1240 address exception_handler_pc() const { return _exception_handler_pc; }
1241 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1242
1243 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1244 void set_exception_pc(address a) { _exception_pc = a; }
1245 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1246 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1247
1248 void clear_exception_oop_and_pc() {
1249 set_exception_oop(NULL);
1250 set_exception_pc(NULL);
1251 }
1252
1253 // Stack overflow support
1254 inline size_t stack_available(address cur_sp);
1255 address stack_yellow_zone_base() {
1256 return (address)(stack_base() -
1257 (stack_size() -
1258 (stack_red_zone_size() + stack_yellow_zone_size())));
1259 }
1260 size_t stack_yellow_zone_size() {
1261 return StackYellowPages * os::vm_page_size();
1262 }
1263 address stack_red_zone_base() {
1264 return (address)(stack_base() - (stack_size() - stack_red_zone_size()));
1265 }
1266 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); }
1267 bool in_stack_yellow_zone(address a) {
1268 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base());
1269 }
1270 bool in_stack_red_zone(address a) {
1271 return (a <= stack_red_zone_base()) &&
1272 (a >= (address)((intptr_t)stack_base() - stack_size()));
1273 }
1274
1275 void create_stack_guard_pages();
1276 void remove_stack_guard_pages();
1277
1278 void enable_stack_yellow_zone();
1279 void disable_stack_yellow_zone();
1280 void enable_stack_red_zone();
1281 void disable_stack_red_zone();
1282
1283 inline bool stack_guard_zone_unused();
1284 inline bool stack_yellow_zone_disabled();
1285 inline bool stack_yellow_zone_enabled();
1286
1287 // Attempt to reguard the stack after a stack overflow may have occurred.
1288 // Returns true if (a) guard pages are not needed on this thread, (b) the
1289 // pages are already guarded, or (c) the pages were successfully reguarded.
1290 // Returns false if there is not enough stack space to reguard the pages, in
1291 // which case the caller should unwind a frame and try again. The argument
1292 // should be the caller's (approximate) sp.
1293 bool reguard_stack(address cur_sp);
1294 // Similar to above but see if current stackpoint is out of the guard area
1295 // and reguard if possible.
1296 bool reguard_stack(void);
1297
1298 address stack_overflow_limit() { return _stack_overflow_limit; }
1299 void set_stack_overflow_limit() {
1300 _stack_overflow_limit = _stack_base - _stack_size +
1301 ((StackShadowPages +
1302 StackYellowPages +
1303 StackRedPages) * os::vm_page_size());
1304 }
1305
1306 // Misc. accessors/mutators
1307 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1308 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1309 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1310
1311 #ifndef PRODUCT
1312 void record_jump(address target, address instr, const char* file, int line);
1313 #endif // PRODUCT
1314
1315 // For assembly stub generation
1316 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1317 #ifndef PRODUCT
1318 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1319 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1320 #endif // PRODUCT
1321 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1322 static ByteSize last_Java_sp_offset() {
1323 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1324 }
1325 static ByteSize last_Java_pc_offset() {
1326 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1327 }
1328 static ByteSize frame_anchor_offset() {
1329 return byte_offset_of(JavaThread, _anchor);
1330 }
1331 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1332 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1333 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1334 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1335 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1336 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1337 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1338 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1339 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1340 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1341 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1342 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1343 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1344
1345 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1346 static ByteSize should_post_on_exceptions_flag_offset() {
1347 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1348 }
1349
1350 #if INCLUDE_ALL_GCS
1351 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1352 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1353 #endif // INCLUDE_ALL_GCS
1354
1355 // Returns the jni environment for this thread
1356 JNIEnv* jni_environment() { return &_jni_environment; }
1357
1358 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1359 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1360 // Only return NULL if thread is off the thread list; starting to
1361 // exit should not return NULL.
1362 if (thread_from_jni_env->is_terminated()) {
1363 thread_from_jni_env->block_if_vm_exited();
1364 return NULL;
1365 } else {
1366 return thread_from_jni_env;
1367 }
1368 }
1369
1370 // JNI critical regions. These can nest.
1371 bool in_critical() { return _jni_active_critical > 0; }
1372 bool in_last_critical() { return _jni_active_critical == 1; }
1373 void enter_critical() {
1374 assert(Thread::current() == this ||
1375 (Thread::current()->is_VM_thread() &&
1376 SafepointSynchronize::is_synchronizing()),
1377 "this must be current thread or synchronizing");
1378 _jni_active_critical++;
1379 }
1380 void exit_critical() {
1381 assert(Thread::current() == this, "this must be current thread");
1382 _jni_active_critical--;
1383 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1384 }
1385
1386 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1387 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1388 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1389 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1390 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1391
1392 // For deadlock detection
1393 int depth_first_number() { return _depth_first_number; }
1394 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1395
1396 private:
1397 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1398
1399 public:
1400 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1401 void add_monitor_chunk(MonitorChunk* chunk);
1402 void remove_monitor_chunk(MonitorChunk* chunk);
1403 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1404 void inc_in_deopt_handler() { _in_deopt_handler++; }
1405 void dec_in_deopt_handler() {
1406 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1407 if (_in_deopt_handler > 0) { // robustness
1408 _in_deopt_handler--;
1409 }
1410 }
1411
1412 private:
1413 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1414
1415 public:
1416
1417 // Frame iteration; calls the function f for all frames on the stack
1418 void frames_do(void f(frame*, const RegisterMap*));
1419
1420 // Memory operations
1421 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1422
1423 // Sweeper operations
1424 void nmethods_do(CodeBlobClosure* cf);
1425
1426 // RedefineClasses Support
1427 void metadata_do(void f(Metadata*));
1428
1429 // Misc. operations
1430 char* name() const { return (char*)get_thread_name(); }
1431 void print_on(outputStream* st) const;
1432 void print_value();
1433 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1434 void print_thread_state() const PRODUCT_RETURN;
1435 void print_on_error(outputStream* st, char* buf, int buflen) const;
1436 void verify();
1437 const char* get_thread_name() const;
1438 private:
1439 // factor out low-level mechanics for use in both normal and error cases
1440 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1441 public:
1442 const char* get_threadgroup_name() const;
1443 const char* get_parent_name() const;
1444
1445 // Accessing frames
1446 frame last_frame() {
1447 _anchor.make_walkable(this);
1448 return pd_last_frame();
1449 }
1450 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1451
1452 // Returns method at 'depth' java or native frames down the stack
1453 // Used for security checks
1454 Klass* security_get_caller_class(int depth);
1455
1456 // Print stack trace in external format
1457 void print_stack_on(outputStream* st);
1458 void print_stack() { print_stack_on(tty); }
1459
1460 // Print stack traces in various internal formats
1461 void trace_stack() PRODUCT_RETURN;
1462 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1463 void trace_frames() PRODUCT_RETURN;
1464 void trace_oops() PRODUCT_RETURN;
1465
1466 // Print an annotated view of the stack frames
1467 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1468 void validate_frame_layout() {
1469 print_frame_layout(0, true);
1470 }
1471
1472 // Returns the number of stack frames on the stack
1473 int depth() const;
1474
1475 // Function for testing deoptimization
1476 void deoptimize();
1477 void make_zombies();
1478
1479 void deoptimized_wrt_marked_nmethods();
1480
1481 // Profiling operation (see fprofile.cpp)
1482 public:
1483 bool profile_last_Java_frame(frame* fr);
1484
1485 private:
1486 ThreadProfiler* _thread_profiler;
1487 private:
1488 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1489 friend class FlatProfilerTask; // uses get_thread_profiler.
1490 friend class ThreadProfilerMark; // uses get_thread_profiler.
1491 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1492 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1493 ThreadProfiler* result = _thread_profiler;
1494 _thread_profiler = tp;
1495 return result;
1496 }
1497
1498 public:
1499 // Returns the running thread as a JavaThread
1500 static inline JavaThread* current();
1501
1502 // Returns the active Java thread. Do not use this if you know you are calling
1503 // from a JavaThread, as it's slower than JavaThread::current. If called from
1504 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1505 // operation. You may not want that either.
1506 static JavaThread* active();
1507
1508 inline CompilerThread* as_CompilerThread();
1509
1510 public:
1511 virtual void run();
1512 void thread_main_inner();
1513
1514 private:
1515 // PRIVILEGED STACK
1516 PrivilegedElement* _privileged_stack_top;
1517 GrowableArray<oop>* _array_for_gc;
1518 public:
1519
1520 // Returns the privileged_stack information.
1521 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1522 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1523 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1524
1525 public:
1526 // Thread local information maintained by JVMTI.
1527 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1528 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1529 // getter is used to get this JavaThread's JvmtiThreadState if it has
1530 // one which means NULL can be returned. JvmtiThreadState::state_for()
1531 // is used to get the specified JavaThread's JvmtiThreadState if it has
1532 // one or it allocates a new JvmtiThreadState for the JavaThread and
1533 // returns it. JvmtiThreadState::state_for() will return NULL only if
1534 // the specified JavaThread is exiting.
1535 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1536 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1537 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1538 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1539
1540 // JVMTI PopFrame support
1541 // Setting and clearing popframe_condition
1542 // All of these enumerated values are bits. popframe_pending
1543 // indicates that a PopFrame() has been requested and not yet been
1544 // completed. popframe_processing indicates that that PopFrame() is in
1545 // the process of being completed. popframe_force_deopt_reexecution_bit
1546 // indicates that special handling is required when returning to a
1547 // deoptimized caller.
1548 enum PopCondition {
1549 popframe_inactive = 0x00,
1550 popframe_pending_bit = 0x01,
1551 popframe_processing_bit = 0x02,
1552 popframe_force_deopt_reexecution_bit = 0x04
1553 };
1554 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1555 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1556 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1557 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1558 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1559 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1560 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1561 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1562 #ifdef CC_INTERP
1563 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1564 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1565 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1566 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1567 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1568 #endif
1569
1570 private:
1571 // Saved incoming arguments to popped frame.
1572 // Used only when popped interpreted frame returns to deoptimized frame.
1573 void* _popframe_preserved_args;
1574 int _popframe_preserved_args_size;
1575
1576 public:
1577 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1578 void* popframe_preserved_args();
1579 ByteSize popframe_preserved_args_size();
1580 WordSize popframe_preserved_args_size_in_words();
1581 void popframe_free_preserved_args();
1582
1583
1584 private:
1585 JvmtiThreadState *_jvmti_thread_state;
1586 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1587
1588 // Used by the interpreter in fullspeed mode for frame pop, method
1589 // entry, method exit and single stepping support. This field is
1590 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1591 // It can be set to zero asynchronously (i.e., without a VM operation
1592 // or a lock) so we have to be very careful.
1593 int _interp_only_mode;
1594
1595 public:
1596 // used by the interpreter for fullspeed debugging support (see above)
1597 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1598 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1599 int get_interp_only_mode() { return _interp_only_mode; }
1600 void increment_interp_only_mode() { ++_interp_only_mode; }
1601 void decrement_interp_only_mode() { --_interp_only_mode; }
1602
1603 // support for cached flag that indicates whether exceptions need to be posted for this thread
1604 // if this is false, we can avoid deoptimizing when events are thrown
1605 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1606 private:
1607 int _should_post_on_exceptions_flag;
1608
1609 public:
1610 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1611 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1612
1613 private:
1614 ThreadStatistics *_thread_stat;
1615
1616 public:
1617 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1618
1619 // Return a blocker object for which this thread is blocked parking.
1620 oop current_park_blocker();
1621
1622 private:
1623 static size_t _stack_size_at_create;
1624
1625 public:
1626 static inline size_t stack_size_at_create(void) {
1627 return _stack_size_at_create;
1628 }
1629 static inline void set_stack_size_at_create(size_t value) {
1630 _stack_size_at_create = value;
1631 }
1632
1633 #if INCLUDE_ALL_GCS
1634 // SATB marking queue support
1635 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1636 static SATBMarkQueueSet& satb_mark_queue_set() {
1637 return _satb_mark_queue_set;
1638 }
1639
1640 // Dirty card queue support
1641 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1642 static DirtyCardQueueSet& dirty_card_queue_set() {
1643 return _dirty_card_queue_set;
1644 }
1645 #endif // INCLUDE_ALL_GCS
1646
1647 // This method initializes the SATB and dirty card queues before a
1648 // JavaThread is added to the Java thread list. Right now, we don't
1649 // have to do anything to the dirty card queue (it should have been
1650 // activated when the thread was created), but we have to activate
1651 // the SATB queue if the thread is created while a marking cycle is
1652 // in progress. The activation / de-activation of the SATB queues at
1653 // the beginning / end of a marking cycle is done during safepoints
1654 // so we have to make sure this method is called outside one to be
1655 // able to safely read the active field of the SATB queue set. Right
1656 // now, it is called just before the thread is added to the Java
1657 // thread list in the Threads::add() method. That method is holding
1658 // the Threads_lock which ensures we are outside a safepoint. We
1659 // cannot do the obvious and set the active field of the SATB queue
1660 // when the thread is created given that, in some cases, safepoints
1661 // might happen between the JavaThread constructor being called and the
1662 // thread being added to the Java thread list (an example of this is
1663 // when the structure for the DestroyJavaVM thread is created).
1664 #if INCLUDE_ALL_GCS
1665 void initialize_queues();
1666 #else // INCLUDE_ALL_GCS
1667 void initialize_queues() { }
1668 #endif // INCLUDE_ALL_GCS
1669
1670 // Machine dependent stuff
1671 #ifdef TARGET_OS_ARCH_linux_x86
1672 # include "thread_linux_x86.hpp"
1673 #endif
1674 #ifdef TARGET_OS_ARCH_linux_sparc
1675 # include "thread_linux_sparc.hpp"
1676 #endif
1677 #ifdef TARGET_OS_ARCH_linux_zero
1678 # include "thread_linux_zero.hpp"
1679 #endif
1680 #ifdef TARGET_OS_ARCH_solaris_x86
1681 # include "thread_solaris_x86.hpp"
1682 #endif
1683 #ifdef TARGET_OS_ARCH_solaris_sparc
1684 # include "thread_solaris_sparc.hpp"
1685 #endif
1686 #ifdef TARGET_OS_ARCH_windows_x86
1687 # include "thread_windows_x86.hpp"
1688 #endif
1689 #ifdef TARGET_OS_ARCH_linux_arm
1690 # include "thread_linux_arm.hpp"
1691 #endif
1692 #ifdef TARGET_OS_ARCH_linux_ppc
1693 # include "thread_linux_ppc.hpp"
1694 #endif
1695 #ifdef TARGET_OS_ARCH_linux_aarch64
1696 # include "thread_linux_aarch64.hpp"
1697 #endif
1698 #ifdef TARGET_OS_ARCH_aix_ppc
1699 # include "thread_aix_ppc.hpp"
1700 #endif
1701 #ifdef TARGET_OS_ARCH_bsd_x86
1702 # include "thread_bsd_x86.hpp"
1703 #endif
1704 #ifdef TARGET_OS_ARCH_bsd_zero
1705 # include "thread_bsd_zero.hpp"
1706 #endif
1707
1708
1709 public:
1710 void set_blocked_on_compilation(bool value) {
1711 _blocked_on_compilation = value;
1712 }
1713
1714 bool blocked_on_compilation() {
1715 return _blocked_on_compilation;
1716 }
1717 protected:
1718 bool _blocked_on_compilation;
1719
1720
1721 // JSR166 per-thread parker
1722 private:
1723 Parker* _parker;
1724 public:
1725 Parker* parker() { return _parker; }
1726
1727 // Biased locking support
1728 private:
1729 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1730 public:
1731 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1732 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1733
1734 // clearing/querying jni attach status
1735 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1736 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1737 inline void set_done_attaching_via_jni();
1738 private:
1739 // This field is used to determine if a thread has claimed
1740 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1741 // otherwise its value is the par_id that has been claimed.
1742 uint _claimed_par_id;
1743 public:
1744 uint get_claimed_par_id() { return _claimed_par_id; }
1745 void set_claimed_par_id(uint id) { _claimed_par_id = id; }
1746 };
1747
1748 // Inline implementation of JavaThread::current
1749 inline JavaThread* JavaThread::current() {
1750 Thread* thread = ThreadLocalStorage::thread();
1751 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1752 return (JavaThread*)thread;
1753 }
1754
1755 inline CompilerThread* JavaThread::as_CompilerThread() {
1756 assert(is_Compiler_thread(), "just checking");
1757 return (CompilerThread*)this;
1758 }
1759
1760 // Dedicated thread to sweep the code cache
1761 class CodeCacheSweeperThread : public JavaThread {
1762 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1763 public:
1764 CodeCacheSweeperThread();
1765 // Track the nmethod currently being scanned by the sweeper
1766 void set_scanned_nmethod(nmethod* nm) {
1767 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1768 _scanned_nmethod = nm;
1769 }
1770
1771 // Hide sweeper thread from external view.
1772 bool is_hidden_from_external_view() const { return true; }
1773
1774 bool is_Code_cache_sweeper_thread() const { return true; }
1775 // GC support
1776 // Apply "f->do_oop" to all root oops in "this".
1777 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1778 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1779 };
1780
1781 // A thread used for Compilation.
1782 class CompilerThread : public JavaThread {
1783 friend class VMStructs;
1784 private:
1785 CompilerCounters* _counters;
1786
1787 ciEnv* _env;
1788 CompileLog* _log;
1789 CompileTask* _task;
1790 CompileQueue* _queue;
1791 BufferBlob* _buffer_blob;
1792
1793 AbstractCompiler* _compiler;
1794
1795 public:
1796
1797 static CompilerThread* current();
1798
1799 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1800
1801 bool is_Compiler_thread() const { return true; }
1802 // Hide this compiler thread from external view.
1803 bool is_hidden_from_external_view() const { return true; }
1804
1805 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1806 AbstractCompiler* compiler() const { return _compiler; }
1807
1808 CompileQueue* queue() const { return _queue; }
1809 CompilerCounters* counters() const { return _counters; }
1810
1811 // Get/set the thread's compilation environment.
1812 ciEnv* env() { return _env; }
1813 void set_env(ciEnv* env) { _env = env; }
1814
1815 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1816 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
1817
1818 // Get/set the thread's logging information
1819 CompileLog* log() { return _log; }
1820 void init_log(CompileLog* log) {
1821 // Set once, for good.
1822 assert(_log == NULL, "set only once");
1823 _log = log;
1824 }
1825
1826 #ifndef PRODUCT
1827 private:
1828 IdealGraphPrinter *_ideal_graph_printer;
1829 public:
1830 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1831 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1832 #endif
1833
1834 // Get/set the thread's current task
1835 CompileTask* task() { return _task; }
1836 void set_task(CompileTask* task) { _task = task; }
1837 };
1838
1839 inline CompilerThread* CompilerThread::current() {
1840 return JavaThread::current()->as_CompilerThread();
1841 }
1842
1843 // The active thread queue. It also keeps track of the current used
1844 // thread priorities.
1845 class Threads: AllStatic {
1846 friend class VMStructs;
1847 private:
1848 static JavaThread* _thread_list;
1849 static int _number_of_threads;
1850 static int _number_of_non_daemon_threads;
1851 static int _return_code;
1852 #ifdef ASSERT
1853 static bool _vm_complete;
1854 #endif
1855
1856 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
1857 static void initialize_jsr292_core_classes(TRAPS);
1858 public:
1859 // Thread management
1860 // force_daemon is a concession to JNI, where we may need to add a
1861 // thread to the thread list before allocating its thread object
1862 static void add(JavaThread* p, bool force_daemon = false);
1863 static void remove(JavaThread* p);
1864 static bool includes(JavaThread* p);
1865 static JavaThread* first() { return _thread_list; }
1866 static void threads_do(ThreadClosure* tc);
1867
1868 // Initializes the vm and creates the vm thread
1869 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1870 static void convert_vm_init_libraries_to_agents();
1871 static void create_vm_init_libraries();
1872 static void create_vm_init_agents();
1873 static void shutdown_vm_agents();
1874 static bool destroy_vm();
1875 // Supported VM versions via JNI
1876 // Includes JNI_VERSION_1_1
1877 static jboolean is_supported_jni_version_including_1_1(jint version);
1878 // Does not include JNI_VERSION_1_1
1879 static jboolean is_supported_jni_version(jint version);
1880
1881 // Garbage collection
1882 static void follow_other_roots(void f(oop*));
1883
1884 // Apply "f->do_oop" to all root oops in all threads.
1885 // This version may only be called by sequential code.
1886 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1887 // This version may be called by sequential or parallel code.
1888 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1889 // This creates a list of GCTasks, one per thread.
1890 static void create_thread_roots_tasks(GCTaskQueue* q);
1891 // This creates a list of GCTasks, one per thread, for marking objects.
1892 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1893
1894 // Apply "f->do_oop" to roots in all threads that
1895 // are part of compiled frames
1896 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1897
1898 static void convert_hcode_pointers();
1899 static void restore_hcode_pointers();
1900
1901 // Sweeper
1902 static void nmethods_do(CodeBlobClosure* cf);
1903
1904 // RedefineClasses support
1905 static void metadata_do(void f(Metadata*));
1906
1907 #ifdef ASSERT
1908 static bool is_vm_complete() { return _vm_complete; }
1909 #endif
1910
1911 // Verification
1912 static void verify();
1913 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1914 static void print(bool print_stacks, bool internal_format) {
1915 // this function is only used by debug.cpp
1916 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1917 }
1918 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1919
1920 // Get Java threads that are waiting to enter a monitor. If doLock
1921 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1922 // VM needs to be at a safepoint.
1923 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1924 address monitor, bool doLock);
1925
1926 // Get owning Java thread from the monitor's owner field. If doLock
1927 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1928 // VM needs to be at a safepoint.
1929 static JavaThread *owning_thread_from_monitor_owner(address owner,
1930 bool doLock);
1931
1932 // Number of threads on the active threads list
1933 static int number_of_threads() { return _number_of_threads; }
1934 // Number of non-daemon threads on the active threads list
1935 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1936
1937 // Deoptimizes all frames tied to marked nmethods
1938 static void deoptimized_wrt_marked_nmethods();
1939
1940 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
1941
1942 };
1943
1944
1945 // Thread iterator
1946 class ThreadClosure: public StackObj {
1947 public:
1948 virtual void do_thread(Thread* thread) = 0;
1949 };
1950
1951 class SignalHandlerMark: public StackObj {
1952 private:
1953 Thread* _thread;
1954 public:
1955 SignalHandlerMark(Thread* t) {
1956 _thread = t;
1957 if (_thread) _thread->enter_signal_handler();
1958 }
1959 ~SignalHandlerMark() {
1960 if (_thread) _thread->leave_signal_handler();
1961 _thread = NULL;
1962 }
1963 };
1964
1965
1966 #endif // SHARE_VM_RUNTIME_THREAD_HPP