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