1 /*
2 * Copyright (c) 1997, 2015, 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 "gc/shared/threadLocalAllocBuffer.hpp"
29 #include "memory/allocation.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/g1/dirtyCardQueue.hpp"
52 #include "gc/g1/satbQueue.hpp"
53 #endif // INCLUDE_ALL_GCS
54 #ifdef TARGET_ARCH_zero
55 # include "stack_zero.hpp"
56 #endif
57
58 class ThreadSafepointState;
59 class ThreadProfiler;
60
61 class JvmtiThreadState;
62 class JvmtiGetLoadedClassesClosure;
63 class ThreadStatistics;
64 class ConcurrentLocksDump;
65 class ParkEvent;
66 class Parker;
67
68 class ciEnv;
69 class CompileThread;
70 class CompileLog;
71 class CompileTask;
72 class CompileQueue;
73 class CompilerCounters;
74 class vframeArray;
75
76 class DeoptResourceMark;
77 class jvmtiDeferredLocalVariableSet;
78
79 class GCTaskQueue;
80 class ThreadClosure;
81 class IdealGraphPrinter;
82
83 class Metadata;
84 template <class T, MEMFLAGS F> class ChunkedList;
85 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
86
87 DEBUG_ONLY(class ResourceMark;)
88
89 class WorkerThread;
90
91 // Class hierarchy
92 // - Thread
93 // - NamedThread
94 // - VMThread
95 // - ConcurrentGCThread
96 // - WorkerThread
97 // - GangWorker
98 // - GCTaskThread
99 // - JavaThread
100 // - WatcherThread
101
102 class Thread: public ThreadShadow {
103 friend class VMStructs;
104 private:
105 // Exception handling
106 // (Note: _pending_exception and friends are in ThreadShadow)
107 //oop _pending_exception; // pending exception for current thread
108 // const char* _exception_file; // file information for exception (debugging only)
109 // int _exception_line; // line information for exception (debugging only)
110 protected:
111 // Support for forcing alignment of thread objects for biased locking
112 void* _real_malloc_address;
113 public:
114 void* operator new(size_t size) throw() { return allocate(size, true); }
115 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
116 return allocate(size, false); }
117 void operator delete(void* p);
118
119 protected:
120 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
121 private:
122
123 // ***************************************************************
124 // Suspend and resume support
125 // ***************************************************************
126 //
127 // VM suspend/resume no longer exists - it was once used for various
128 // things including safepoints but was deprecated and finally removed
129 // in Java 7. Because VM suspension was considered "internal" Java-level
130 // suspension was considered "external", and this legacy naming scheme
131 // remains.
132 //
133 // External suspend/resume requests come from JVM_SuspendThread,
134 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
135 // ResumeThread. External
136 // suspend requests cause _external_suspend to be set and external
137 // resume requests cause _external_suspend to be cleared.
138 // External suspend requests do not nest on top of other external
139 // suspend requests. The higher level APIs reject suspend requests
140 // for already suspended threads.
141 //
142 // The external_suspend
143 // flag is checked by has_special_runtime_exit_condition() and java thread
144 // will self-suspend when handle_special_runtime_exit_condition() is
145 // called. Most uses of the _thread_blocked state in JavaThreads are
146 // considered the same as being externally suspended; if the blocking
147 // condition lifts, the JavaThread will self-suspend. Other places
148 // where VM checks for external_suspend include:
149 // + mutex granting (do not enter monitors when thread is suspended)
150 // + state transitions from _thread_in_native
151 //
152 // In general, java_suspend() does not wait for an external suspend
153 // request to complete. When it returns, the only guarantee is that
154 // the _external_suspend field is true.
155 //
156 // wait_for_ext_suspend_completion() is used to wait for an external
157 // suspend request to complete. External suspend requests are usually
158 // followed by some other interface call that requires the thread to
159 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
160 // the interface that requires quiescence, we give the JavaThread a
161 // chance to self-suspend before we need it to be quiescent. This
162 // improves overall suspend/query performance.
163 //
164 // _suspend_flags controls the behavior of java_ suspend/resume.
165 // It must be set under the protection of SR_lock. Read from the flag is
166 // OK without SR_lock as long as the value is only used as a hint.
167 // (e.g., check _external_suspend first without lock and then recheck
168 // inside SR_lock and finish the suspension)
169 //
170 // _suspend_flags is also overloaded for other "special conditions" so
171 // that a single check indicates whether any special action is needed
172 // eg. for async exceptions.
173 // -------------------------------------------------------------------
174 // Notes:
175 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
176 // but we still update its value to keep other part of the system (mainly
177 // JVMTI) happy. ThreadState is legacy code (see notes in
178 // osThread.hpp).
179 //
180 // 2. It would be more natural if set_external_suspend() is private and
181 // part of java_suspend(), but that probably would affect the suspend/query
182 // performance. Need more investigation on this.
183
184 // suspend/resume lock: used for self-suspend
185 Monitor* _SR_lock;
186
187 protected:
188 enum SuspendFlags {
189 // NOTE: avoid using the sign-bit as cc generates different test code
190 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
191
192 _external_suspend = 0x20000000U, // thread is asked to self suspend
193 _ext_suspended = 0x40000000U, // thread has self-suspended
194 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
195
196 _has_async_exception = 0x00000001U, // there is a pending async exception
197 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
198 };
199
200 // various suspension related flags - atomically updated
201 // overloaded for async exception checking in check_special_condition_for_native_trans.
202 volatile uint32_t _suspend_flags;
203
204 private:
205 int _num_nested_signal;
206
207 DEBUG_ONLY(bool _suspendible_thread;)
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 #ifdef ASSERT
215 void set_suspendible_thread() {
216 _suspendible_thread = true;
217 }
218
219 void clear_suspendible_thread() {
220 _suspendible_thread = false;
221 }
222
223 bool is_suspendible_thread() { return _suspendible_thread; }
224 #endif
225
226 private:
227 // Active_handles points to a block of handles
228 JNIHandleBlock* _active_handles;
229
230 // One-element thread local free list
231 JNIHandleBlock* _free_handle_block;
232
233 // Point to the last handle mark
234 HandleMark* _last_handle_mark;
235
236 // The parity of the last strong_roots iteration in which this thread was
237 // claimed as a task.
238 jint _oops_do_parity;
239
240 public:
241 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
242 HandleMark* last_handle_mark() const { return _last_handle_mark; }
243 private:
244
245 // debug support for checking if code does allow safepoints or not
246 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
247 // mutex, or blocking on an object synchronizer (Java locking).
248 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
249 // If !allow_allocation(), then an assertion failure will happen during allocation
250 // (Hence, !allow_safepoint() => !allow_allocation()).
251 //
252 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
253 //
254 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
255 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
256
257 // Used by SkipGCALot class.
258 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
259
260 friend class No_Alloc_Verifier;
261 friend class No_Safepoint_Verifier;
262 friend class Pause_No_Safepoint_Verifier;
263 friend class ThreadLocalStorage;
264 friend class GC_locker;
265
266 ThreadLocalAllocBuffer _tlab; // Thread-local eden
267 jlong _allocated_bytes; // Cumulative number of bytes allocated on
268 // the Java heap
269 uint _gc_id; // The current GC id when a thread takes part in GC
270
271 TRACE_DATA _trace_data; // Thread-local data for tracing
272
273 ThreadExt _ext;
274
275 int _vm_operation_started_count; // VM_Operation support
276 int _vm_operation_completed_count; // VM_Operation support
277
278 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
279 // is waiting to lock
280 bool _current_pending_monitor_is_from_java; // locking is from Java code
281
282 // ObjectMonitor on which this thread called Object.wait()
283 ObjectMonitor* _current_waiting_monitor;
284
285 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
286 public:
287 ObjectMonitor* omFreeList;
288 int omFreeCount; // length of omFreeList
289 int omFreeProvision; // reload chunk size
290 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
291 int omInUseCount; // length of omInUseList
292
293 #ifdef ASSERT
294 private:
295 bool _visited_for_critical_count;
296
297 public:
298 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
299 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
300 #endif
301
302 public:
303 enum {
304 is_definitely_current_thread = true
305 };
306
307 // Constructor
308 Thread();
309 virtual ~Thread();
310
311 // initializtion
312 void initialize_thread_local_storage();
313
314 // thread entry point
315 virtual void run();
316
317 // Testers
318 virtual bool is_VM_thread() const { return false; }
319 virtual bool is_Java_thread() const { return false; }
320 virtual bool is_Compiler_thread() const { return false; }
321 virtual bool is_Code_cache_sweeper_thread() const { return false; }
322 virtual bool is_hidden_from_external_view() const { return false; }
323 virtual bool is_jvmti_agent_thread() const { return false; }
324 // True iff the thread can perform GC operations at a safepoint.
325 // Generally will be true only of VM thread and parallel GC WorkGang
326 // threads.
327 virtual bool is_GC_task_thread() const { return false; }
328 virtual bool is_Watcher_thread() const { return false; }
329 virtual bool is_ConcurrentGC_thread() const { return false; }
330 virtual bool is_Named_thread() const { return false; }
331 virtual bool is_Worker_thread() const { return false; }
332
333 // Casts
334 virtual WorkerThread* as_Worker_thread() const { return NULL; }
335
336 virtual char* name() const { return (char*)"Unknown thread"; }
337
338 // Returns the current thread
339 static inline Thread* current();
340 // ... without having to include thread.inline.hpp.
341 static Thread* current_noinline();
342
343 // Common thread operations
344 static void set_priority(Thread* thread, ThreadPriority priority);
345 static ThreadPriority get_priority(const Thread* const thread);
346 static void start(Thread* thread);
347 static void interrupt(Thread* thr);
348 static bool is_interrupted(Thread* thr, bool clear_interrupted);
349
350 void set_native_thread_name(const char *name) {
351 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
352 os::set_native_thread_name(name);
353 }
354
355 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
356 Monitor* SR_lock() const { return _SR_lock; }
357
358 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
359
360 inline void set_suspend_flag(SuspendFlags f);
361 inline void clear_suspend_flag(SuspendFlags f);
362
363 inline void set_has_async_exception();
364 inline void clear_has_async_exception();
365
366 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
367
368 inline void set_critical_native_unlock();
369 inline void clear_critical_native_unlock();
370
371 // Support for Unhandled Oop detection
372 // Add the field for both, fastdebug and debug, builds to keep
373 // Thread's fields layout the same.
374 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build.
375 #ifdef CHECK_UNHANDLED_OOPS
376 private:
377 UnhandledOops* _unhandled_oops;
378 #elif defined(ASSERT)
379 private:
380 void* _unhandled_oops;
381 #endif
382 #ifdef CHECK_UNHANDLED_OOPS
383 public:
384 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
385 // Mark oop safe for gc. It may be stack allocated but won't move.
386 void allow_unhandled_oop(oop *op) {
387 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
388 }
389 // Clear oops at safepoint so crashes point to unhandled oop violator
390 void clear_unhandled_oops() {
391 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
392 }
393 #endif // CHECK_UNHANDLED_OOPS
394
395 public:
396 #ifndef PRODUCT
397 bool skip_gcalot() { return _skip_gcalot; }
398 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
399 #endif
400
401 // Installs a pending exception to be inserted later
402 static void send_async_exception(oop thread_oop, oop java_throwable);
403
404 // Resource area
405 ResourceArea* resource_area() const { return _resource_area; }
406 void set_resource_area(ResourceArea* area) { _resource_area = area; }
407
408 OSThread* osthread() const { return _osthread; }
409 void set_osthread(OSThread* thread) { _osthread = thread; }
410
411 // JNI handle support
412 JNIHandleBlock* active_handles() const { return _active_handles; }
413 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
414 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
415 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
416
417 // Internal handle support
418 HandleArea* handle_area() const { return _handle_area; }
419 void set_handle_area(HandleArea* area) { _handle_area = area; }
420
421 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
422 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
423
424 // Thread-Local Allocation Buffer (TLAB) support
425 ThreadLocalAllocBuffer& tlab() { return _tlab; }
426 void initialize_tlab() {
427 if (UseTLAB) {
428 tlab().initialize();
429 }
430 }
431
432 jlong allocated_bytes() { return _allocated_bytes; }
433 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
434 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
435 inline jlong cooked_allocated_bytes();
436
437 void set_gc_id(uint gc_id) { _gc_id = gc_id; }
438 uint gc_id() { return _gc_id; }
439
440 TRACE_DATA* trace_data() { return &_trace_data; }
441
442 const ThreadExt& ext() const { return _ext; }
443 ThreadExt& ext() { return _ext; }
444
445 // VM operation support
446 int vm_operation_ticket() { return ++_vm_operation_started_count; }
447 int vm_operation_completed_count() { return _vm_operation_completed_count; }
448 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
449
450 // For tracking the heavyweight monitor the thread is pending on.
451 ObjectMonitor* current_pending_monitor() {
452 return _current_pending_monitor;
453 }
454 void set_current_pending_monitor(ObjectMonitor* monitor) {
455 _current_pending_monitor = monitor;
456 }
457 void set_current_pending_monitor_is_from_java(bool from_java) {
458 _current_pending_monitor_is_from_java = from_java;
459 }
460 bool current_pending_monitor_is_from_java() {
461 return _current_pending_monitor_is_from_java;
462 }
463
464 // For tracking the ObjectMonitor on which this thread called Object.wait()
465 ObjectMonitor* current_waiting_monitor() {
466 return _current_waiting_monitor;
467 }
468 void set_current_waiting_monitor(ObjectMonitor* monitor) {
469 _current_waiting_monitor = monitor;
470 }
471
472 // GC support
473 // Apply "f->do_oop" to all root oops in "this".
474 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
475 // Used by JavaThread::oops_do.
476 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
477 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
478
479 // Handles the parallel case for the method below.
480 private:
481 bool claim_oops_do_par_case(int collection_parity);
482 public:
483 // Requires that "collection_parity" is that of the current roots
484 // iteration. If "is_par" is false, sets the parity of "this" to
485 // "collection_parity", and returns "true". If "is_par" is true,
486 // uses an atomic instruction to set the current threads parity to
487 // "collection_parity", if it is not already. Returns "true" iff the
488 // calling thread does the update, this indicates that the calling thread
489 // has claimed the thread's stack as a root groop in the current
490 // collection.
491 bool claim_oops_do(bool is_par, int collection_parity) {
492 if (!is_par) {
493 _oops_do_parity = collection_parity;
494 return true;
495 } else {
496 return claim_oops_do_par_case(collection_parity);
497 }
498 }
499
500 // Sweeper support
501 void nmethods_do(CodeBlobClosure* cf);
502
503 // jvmtiRedefineClasses support
504 void metadata_handles_do(void f(Metadata*));
505
506 // Used by fast lock support
507 virtual bool is_lock_owned(address adr) const;
508
509 // Check if address is in the stack of the thread (not just for locks).
510 // Warning: the method can only be used on the running thread
511 bool is_in_stack(address adr) const;
512 // Check if address is in the usable part of the stack (excludes protected
513 // guard pages)
514 bool is_in_usable_stack(address adr) const;
515
516 // Sets this thread as starting thread. Returns failure if thread
517 // creation fails due to lack of memory, too many threads etc.
518 bool set_as_starting_thread();
519
520 protected:
521 // OS data associated with the thread
522 OSThread* _osthread; // Platform-specific thread information
523
524 // Thread local resource area for temporary allocation within the VM
525 ResourceArea* _resource_area;
526
527 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
528
529 // Thread local handle area for allocation of handles within the VM
530 HandleArea* _handle_area;
531 GrowableArray<Metadata*>* _metadata_handles;
532
533 // Support for stack overflow handling, get_thread, etc.
534 address _stack_base;
535 size_t _stack_size;
536 uintptr_t _self_raw_id; // used by get_thread (mutable)
537 int _lgrp_id;
538
539 public:
540 // Stack overflow support
541 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
542
543 void set_stack_base(address base) { _stack_base = base; }
544 size_t stack_size() const { return _stack_size; }
545 void set_stack_size(size_t size) { _stack_size = size; }
546 void record_stack_base_and_size();
547
548 bool on_local_stack(address adr) const {
549 // QQQ this has knowledge of direction, ought to be a stack method
550 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
551 }
552
553 uintptr_t self_raw_id() { return _self_raw_id; }
554 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
555
556 int lgrp_id() const { return _lgrp_id; }
557 void set_lgrp_id(int value) { _lgrp_id = value; }
558
559 // Printing
560 virtual void print_on(outputStream* st) const;
561 void print() const { print_on(tty); }
562 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
563
564 // Debug-only code
565 #ifdef ASSERT
566 private:
567 // Deadlock detection support for Mutex locks. List of locks own by thread.
568 Monitor* _owned_locks;
569 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
570 // thus the friendship
571 friend class Mutex;
572 friend class Monitor;
573
574 public:
575 void print_owned_locks_on(outputStream* st) const;
576 void print_owned_locks() const { print_owned_locks_on(tty); }
577 Monitor* owned_locks() const { return _owned_locks; }
578 bool owns_locks() const { return owned_locks() != NULL; }
579 bool owns_locks_but_compiled_lock() const;
580 int oops_do_parity() const { return _oops_do_parity; }
581
582 // Deadlock detection
583 bool allow_allocation() { return _allow_allocation_count == 0; }
584 ResourceMark* current_resource_mark() { return _current_resource_mark; }
585 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
586 #endif
587
588 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
589
590 private:
591 volatile int _jvmti_env_iteration_count;
592
593 public:
594 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
595 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
596 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
597
598 // Code generation
599 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
600 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
601 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
602
603 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
604 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
605
606 #define TLAB_FIELD_OFFSET(name) \
607 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
608
609 TLAB_FIELD_OFFSET(start)
610 TLAB_FIELD_OFFSET(end)
611 TLAB_FIELD_OFFSET(top)
612 TLAB_FIELD_OFFSET(pf_top)
613 TLAB_FIELD_OFFSET(size) // desired_size
614 TLAB_FIELD_OFFSET(refill_waste_limit)
615 TLAB_FIELD_OFFSET(number_of_refills)
616 TLAB_FIELD_OFFSET(fast_refill_waste)
617 TLAB_FIELD_OFFSET(slow_allocations)
618
619 #undef TLAB_FIELD_OFFSET
620
621 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
622
623 public:
624 volatile intptr_t _Stalled;
625 volatile int _TypeTag;
626 ParkEvent * _ParkEvent; // for synchronized()
627 ParkEvent * _SleepEvent; // for Thread.sleep
628 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
629 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
630 int NativeSyncRecursion; // diagnostic
631
632 volatile int _OnTrap; // Resume-at IP delta
633 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
634 jint _hashStateX; // thread-specific hashCode generator state
635 jint _hashStateY;
636 jint _hashStateZ;
637 void * _schedctl;
638
639
640 volatile jint rng[4]; // RNG for spin loop
641
642 // Low-level leaf-lock primitives used to implement synchronization
643 // and native monitor-mutex infrastructure.
644 // Not for general synchronization use.
645 static void SpinAcquire(volatile int * Lock, const char * Name);
646 static void SpinRelease(volatile int * Lock);
647 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
648 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
649 static void muxRelease(volatile intptr_t * Lock);
650 };
651
652 // Inline implementation of Thread::current()
653 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
654 // startup.
655 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
656 // period. This is inlined in thread_<os_family>.inline.hpp.
657
658 inline Thread* Thread::current() {
659 #ifdef ASSERT
660 // This function is very high traffic. Define PARANOID to enable expensive
661 // asserts.
662 #ifdef PARANOID
663 // Signal handler should call ThreadLocalStorage::get_thread_slow()
664 Thread* t = ThreadLocalStorage::get_thread_slow();
665 assert(t != NULL && !t->is_inside_signal_handler(),
666 "Don't use Thread::current() inside signal handler");
667 #endif
668 #endif
669 Thread* thread = ThreadLocalStorage::thread();
670 assert(thread != NULL, "just checking");
671 return thread;
672 }
673
674 // Name support for threads. non-JavaThread subclasses with multiple
675 // uniquely named instances should derive from this.
676 class NamedThread: public Thread {
677 friend class VMStructs;
678 enum {
679 max_name_len = 64
680 };
681 private:
682 char* _name;
683 // log JavaThread being processed by oops_do
684 JavaThread* _processed_thread;
685
686 public:
687 NamedThread();
688 ~NamedThread();
689 // May only be called once per thread.
690 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
691 void initialize_named_thread();
692 virtual bool is_Named_thread() const { return true; }
693 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
694 JavaThread *processed_thread() { return _processed_thread; }
695 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
696 virtual void print_on(outputStream* st) const;
697 };
698
699 // Worker threads are named and have an id of an assigned work.
700 class WorkerThread: public NamedThread {
701 private:
702 uint _id;
703 public:
704 WorkerThread() : _id(0) { }
705 virtual bool is_Worker_thread() const { return true; }
706
707 virtual WorkerThread* as_Worker_thread() const {
708 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
709 return (WorkerThread*) this;
710 }
711
712 void set_id(uint work_id) { _id = work_id; }
713 uint id() const { return _id; }
714 };
715
716 // A single WatcherThread is used for simulating timer interrupts.
717 class WatcherThread: public Thread {
718 friend class VMStructs;
719 public:
720 virtual void run();
721
722 private:
723 static WatcherThread* _watcher_thread;
724
725 static bool _startable;
726 // volatile due to at least one lock-free read
727 volatile static bool _should_terminate;
728
729 os::WatcherThreadCrashProtection* _crash_protection;
730 public:
731 enum SomeConstants {
732 delay_interval = 10 // interrupt delay in milliseconds
733 };
734
735 // Constructor
736 WatcherThread();
737
738 // Tester
739 bool is_Watcher_thread() const { return true; }
740
741 // Printing
742 char* name() const { return (char*)"VM Periodic Task Thread"; }
743 void print_on(outputStream* st) const;
744 void unpark();
745
746 // Returns the single instance of WatcherThread
747 static WatcherThread* watcher_thread() { return _watcher_thread; }
748
749 // Create and start the single instance of WatcherThread, or stop it on shutdown
750 static void start();
751 static void stop();
752 // Only allow start once the VM is sufficiently initialized
753 // Otherwise the first task to enroll will trigger the start
754 static void make_startable();
755
756 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
757 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
758 _crash_protection = crash_protection;
759 }
760
761 bool has_crash_protection() const { return _crash_protection != NULL; }
762 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
763
764 private:
765 int sleep() const;
766 };
767
768
769 class CompilerThread;
770
771 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
772
773 class JavaThread: public Thread {
774 friend class VMStructs;
775 friend class WhiteBox;
776 private:
777 JavaThread* _next; // The next thread in the Threads list
778 oop _threadObj; // The Java level thread object
779
780 #ifdef ASSERT
781 private:
782 int _java_call_counter;
783
784 public:
785 int java_call_counter() { return _java_call_counter; }
786 void inc_java_call_counter() { _java_call_counter++; }
787 void dec_java_call_counter() {
788 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
789 _java_call_counter--;
790 }
791 private: // restore original namespace restriction
792 #endif // ifdef ASSERT
793
794 #ifndef PRODUCT
795 public:
796 enum {
797 jump_ring_buffer_size = 16
798 };
799 private: // restore original namespace restriction
800 #endif
801
802 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
803
804 ThreadFunction _entry_point;
805
806 JNIEnv _jni_environment;
807
808 // Deopt support
809 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
810
811 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
812 // transition out of native
813 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
814 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
815 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
816 // Because deoptimization is lazy we must save jvmti requests to set locals
817 // in compiled frames until we deoptimize and we have an interpreter frame.
818 // This holds the pointer to array (yeah like there might be more than one) of
819 // description of compiled vframes that have locals that need to be updated.
820 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
821
822 // Handshake value for fixing 6243940. We need a place for the i2c
823 // adapter to store the callee Method*. This value is NEVER live
824 // across a gc point so it does NOT have to be gc'd
825 // The handshake is open ended since we can't be certain that it will
826 // be NULLed. This is because we rarely ever see the race and end up
827 // in handle_wrong_method which is the backend of the handshake. See
828 // code in i2c adapters and handle_wrong_method.
829
830 Method* _callee_target;
831
832 // Used to pass back results to the interpreter or generated code running Java code.
833 oop _vm_result; // oop result is GC-preserved
834 Metadata* _vm_result_2; // non-oop result
835
836 // See ReduceInitialCardMarks: this holds the precise space interval of
837 // the most recent slow path allocation for which compiled code has
838 // elided card-marks for performance along the fast-path.
839 MemRegion _deferred_card_mark;
840
841 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
842 // allocated during deoptimization
843 // and by JNI_MonitorEnter/Exit
844
845 // Async. requests support
846 enum AsyncRequests {
847 _no_async_condition = 0,
848 _async_exception,
849 _async_unsafe_access_error
850 };
851 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
852 oop _pending_async_exception;
853
854 // Safepoint support
855 public: // Expose _thread_state for SafeFetchInt()
856 volatile JavaThreadState _thread_state;
857 private:
858 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
859 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
860
861 // JavaThread termination support
862 enum TerminatedTypes {
863 _not_terminated = 0xDEAD - 2,
864 _thread_exiting, // JavaThread::exit() has been called for this thread
865 _thread_terminated, // JavaThread is removed from thread list
866 _vm_exited // JavaThread is still executing native code, but VM is terminated
867 // only VM_Exit can set _vm_exited
868 };
869
870 // In general a JavaThread's _terminated field transitions as follows:
871 //
872 // _not_terminated => _thread_exiting => _thread_terminated
873 //
874 // _vm_exited is a special value to cover the case of a JavaThread
875 // executing native code after the VM itself is terminated.
876 volatile TerminatedTypes _terminated;
877 // suspend/resume support
878 volatile bool _suspend_equivalent; // Suspend equivalent condition
879 jint _in_deopt_handler; // count of deoptimization
880 // handlers thread is in
881 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
882 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
883 // never locked) when throwing an exception. Used by interpreter only.
884
885 // JNI attach states:
886 enum JNIAttachStates {
887 _not_attaching_via_jni = 1, // thread is not attaching via JNI
888 _attaching_via_jni, // thread is attaching via JNI
889 _attached_via_jni // thread has attached via JNI
890 };
891
892 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
893 // A native thread that is attaching via JNI starts with a value
894 // of _attaching_via_jni and transitions to _attached_via_jni.
895 volatile JNIAttachStates _jni_attach_state;
896
897 public:
898 // State of the stack guard pages for this thread.
899 enum StackGuardState {
900 stack_guard_unused, // not needed
901 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
902 stack_guard_enabled // enabled
903 };
904
905 private:
906
907 StackGuardState _stack_guard_state;
908
909 // Precompute the limit of the stack as used in stack overflow checks.
910 // We load it from here to simplify the stack overflow check in assembly.
911 address _stack_overflow_limit;
912
913 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
914 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
915 // code)
916 volatile oop _exception_oop; // Exception thrown in compiled code
917 volatile address _exception_pc; // PC where exception happened
918 volatile address _exception_handler_pc; // PC for handler of exception
919 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
920
921 // support for JNI critical regions
922 jint _jni_active_critical; // count of entries into JNI critical region
923
924 // Checked JNI: function name requires exception check
925 char* _pending_jni_exception_check_fn;
926
927 // For deadlock detection.
928 int _depth_first_number;
929
930 // JVMTI PopFrame support
931 // This is set to popframe_pending to signal that top Java frame should be popped immediately
932 int _popframe_condition;
933
934 // If reallocation of scalar replaced objects fails, we throw OOM
935 // and during exception propagation, pop the top
936 // _frames_to_pop_failed_realloc frames, the ones that reference
937 // failed reallocations.
938 int _frames_to_pop_failed_realloc;
939
940 #ifndef PRODUCT
941 int _jmp_ring_index;
942 struct {
943 // We use intptr_t instead of address so debugger doesn't try and display strings
944 intptr_t _target;
945 intptr_t _instruction;
946 const char* _file;
947 int _line;
948 } _jmp_ring[jump_ring_buffer_size];
949 #endif // PRODUCT
950
951 #if INCLUDE_ALL_GCS
952 // Support for G1 barriers
953
954 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
955 // Set of all such queues.
956 static SATBMarkQueueSet _satb_mark_queue_set;
957
958 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
959 // Set of all such queues.
960 static DirtyCardQueueSet _dirty_card_queue_set;
961
962 void flush_barrier_queues();
963 #endif // INCLUDE_ALL_GCS
964
965 friend class VMThread;
966 friend class ThreadWaitTransition;
967 friend class VM_Exit;
968
969 void initialize(); // Initialized the instance variables
970
971 public:
972 // Constructor
973 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
974 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
975 ~JavaThread();
976
977 #ifdef ASSERT
978 // verify this JavaThread hasn't be published in the Threads::list yet
979 void verify_not_published();
980 #endif
981
982 //JNI functiontable getter/setter for JVMTI jni function table interception API.
983 void set_jni_functions(struct JNINativeInterface_* functionTable) {
984 _jni_environment.functions = functionTable;
985 }
986 struct JNINativeInterface_* get_jni_functions() {
987 return (struct JNINativeInterface_ *)_jni_environment.functions;
988 }
989
990 // This function is called at thread creation to allow
991 // platform specific thread variables to be initialized.
992 void cache_global_variables();
993
994 // Executes Shutdown.shutdown()
995 void invoke_shutdown_hooks();
996
997 // Cleanup on thread exit
998 enum ExitType {
999 normal_exit,
1000 jni_detach
1001 };
1002 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1003
1004 void cleanup_failed_attach_current_thread();
1005
1006 // Testers
1007 virtual bool is_Java_thread() const { return true; }
1008
1009 // Thread chain operations
1010 JavaThread* next() const { return _next; }
1011 void set_next(JavaThread* p) { _next = p; }
1012
1013 // Thread oop. threadObj() can be NULL for initial JavaThread
1014 // (or for threads attached via JNI)
1015 oop threadObj() const { return _threadObj; }
1016 void set_threadObj(oop p) { _threadObj = p; }
1017
1018 ThreadPriority java_priority() const; // Read from threadObj()
1019
1020 // Prepare thread and add to priority queue. If a priority is
1021 // not specified, use the priority of the thread object. Threads_lock
1022 // must be held while this function is called.
1023 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1024 void prepare_ext();
1025
1026 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1027 address saved_exception_pc() { return _saved_exception_pc; }
1028
1029
1030 ThreadFunction entry_point() const { return _entry_point; }
1031
1032 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1033 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1034
1035 // Last frame anchor routines
1036
1037 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1038
1039 // last_Java_sp
1040 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1041 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1042
1043 // last_Java_pc
1044
1045 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1046
1047 // Safepoint support
1048 #if !(defined(PPC64) || defined(AARCH64))
1049 JavaThreadState thread_state() const { return _thread_state; }
1050 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1051 #else
1052 // Use membars when accessing volatile _thread_state. See
1053 // Threads::create_vm() for size checks.
1054 inline JavaThreadState thread_state() const;
1055 inline void set_thread_state(JavaThreadState s);
1056 #endif
1057 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1058 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1059 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1060
1061 // thread has called JavaThread::exit() or is terminated
1062 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1063 // thread is terminated (no longer on the threads list); we compare
1064 // against the two non-terminated values so that a freed JavaThread
1065 // will also be considered terminated.
1066 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1067 void set_terminated(TerminatedTypes t) { _terminated = t; }
1068 // special for Threads::remove() which is static:
1069 void set_terminated_value() { _terminated = _thread_terminated; }
1070 void block_if_vm_exited();
1071
1072 bool doing_unsafe_access() { return _doing_unsafe_access; }
1073 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1074
1075 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1076 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1077
1078 // Suspend/resume support for JavaThread
1079 private:
1080 inline void set_ext_suspended();
1081 inline void clear_ext_suspended();
1082
1083 public:
1084 void java_suspend();
1085 void java_resume();
1086 int java_suspend_self();
1087
1088 void check_and_wait_while_suspended() {
1089 assert(JavaThread::current() == this, "sanity check");
1090
1091 bool do_self_suspend;
1092 do {
1093 // were we externally suspended while we were waiting?
1094 do_self_suspend = handle_special_suspend_equivalent_condition();
1095 if (do_self_suspend) {
1096 // don't surprise the thread that suspended us by returning
1097 java_suspend_self();
1098 set_suspend_equivalent();
1099 }
1100 } while (do_self_suspend);
1101 }
1102 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1103 // Check for async exception in addition to safepoint and suspend request.
1104 static void check_special_condition_for_native_trans(JavaThread *thread);
1105
1106 // Same as check_special_condition_for_native_trans but finishes the
1107 // transition into thread_in_Java mode so that it can potentially
1108 // block.
1109 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1110
1111 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1112 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1113 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1114 // Warning: is_ext_suspend_completed() may temporarily drop the
1115 // SR_lock to allow the thread to reach a stable thread state if
1116 // it is currently in a transient thread state.
1117 return is_ext_suspend_completed(false /* !called_by_wait */,
1118 SuspendRetryDelay, bits);
1119 }
1120
1121 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1122 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1123 // passed as the count and delay parameters. Experiments with specific
1124 // calls to wait_for_ext_suspend_completion() can be done by passing
1125 // other values in the code. Experiments with all calls can be done
1126 // via the appropriate -XX options.
1127 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1128
1129 inline void set_external_suspend();
1130 inline void clear_external_suspend();
1131
1132 inline void set_deopt_suspend();
1133 inline void clear_deopt_suspend();
1134 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1135
1136 bool is_external_suspend() const {
1137 return (_suspend_flags & _external_suspend) != 0;
1138 }
1139 // Whenever a thread transitions from native to vm/java it must suspend
1140 // if external|deopt suspend is present.
1141 bool is_suspend_after_native() const {
1142 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1143 }
1144
1145 // external suspend request is completed
1146 bool is_ext_suspended() const {
1147 return (_suspend_flags & _ext_suspended) != 0;
1148 }
1149
1150 bool is_external_suspend_with_lock() const {
1151 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1152 return is_external_suspend();
1153 }
1154
1155 // Special method to handle a pending external suspend request
1156 // when a suspend equivalent condition lifts.
1157 bool handle_special_suspend_equivalent_condition() {
1158 assert(is_suspend_equivalent(),
1159 "should only be called in a suspend equivalence condition");
1160 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1161 bool ret = is_external_suspend();
1162 if (!ret) {
1163 // not about to self-suspend so clear suspend equivalence
1164 clear_suspend_equivalent();
1165 }
1166 // implied else:
1167 // We have a pending external suspend request so we leave the
1168 // suspend_equivalent flag set until java_suspend_self() sets
1169 // the ext_suspended flag and clears the suspend_equivalent
1170 // flag. This insures that wait_for_ext_suspend_completion()
1171 // will return consistent values.
1172 return ret;
1173 }
1174
1175 // utility methods to see if we are doing some kind of suspension
1176 bool is_being_ext_suspended() const {
1177 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1178 return is_ext_suspended() || is_external_suspend();
1179 }
1180
1181 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1182
1183 void set_suspend_equivalent() { _suspend_equivalent = true; }
1184 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1185
1186 // Thread.stop support
1187 void send_thread_stop(oop throwable);
1188 AsyncRequests clear_special_runtime_exit_condition() {
1189 AsyncRequests x = _special_runtime_exit_condition;
1190 _special_runtime_exit_condition = _no_async_condition;
1191 return x;
1192 }
1193
1194 // Are any async conditions present?
1195 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1196
1197 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1198
1199 // these next two are also used for self-suspension and async exception support
1200 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1201
1202 // Return true if JavaThread has an asynchronous condition or
1203 // if external suspension is requested.
1204 bool has_special_runtime_exit_condition() {
1205 // We call is_external_suspend() last since external suspend should
1206 // be less common. Because we don't use is_external_suspend_with_lock
1207 // it is possible that we won't see an asynchronous external suspend
1208 // request that has just gotten started, i.e., SR_lock grabbed but
1209 // _external_suspend field change either not made yet or not visible
1210 // yet. However, this is okay because the request is asynchronous and
1211 // we will see the new flag value the next time through. It's also
1212 // possible that the external suspend request is dropped after
1213 // we have checked is_external_suspend(), we will recheck its value
1214 // under SR_lock in java_suspend_self().
1215 return (_special_runtime_exit_condition != _no_async_condition) ||
1216 is_external_suspend() || is_deopt_suspend();
1217 }
1218
1219 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1220
1221 inline void set_pending_async_exception(oop e);
1222
1223 // Fast-locking support
1224 bool is_lock_owned(address adr) const;
1225
1226 // Accessors for vframe array top
1227 // The linked list of vframe arrays are sorted on sp. This means when we
1228 // unpack the head must contain the vframe array to unpack.
1229 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1230 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1231
1232 // Side structure for deferring update of java frame locals until deopt occurs
1233 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1234 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1235
1236 // These only really exist to make debugging deopt problems simpler
1237
1238 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1239 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1240
1241 // The special resourceMark used during deoptimization
1242
1243 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1244 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1245
1246 intptr_t* must_deopt_id() { return _must_deopt_id; }
1247 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1248 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1249
1250 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1251 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1252
1253 Method* callee_target() const { return _callee_target; }
1254 void set_callee_target (Method* x) { _callee_target = x; }
1255
1256 // Oop results of vm runtime calls
1257 oop vm_result() const { return _vm_result; }
1258 void set_vm_result (oop x) { _vm_result = x; }
1259
1260 Metadata* vm_result_2() const { return _vm_result_2; }
1261 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1262
1263 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1264 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1265
1266 // Exception handling for compiled methods
1267 oop exception_oop() const { return _exception_oop; }
1268 address exception_pc() const { return _exception_pc; }
1269 address exception_handler_pc() const { return _exception_handler_pc; }
1270 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1271
1272 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1273 void set_exception_pc(address a) { _exception_pc = a; }
1274 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1275 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1276
1277 void clear_exception_oop_and_pc() {
1278 set_exception_oop(NULL);
1279 set_exception_pc(NULL);
1280 }
1281
1282 // Stack overflow support
1283 inline size_t stack_available(address cur_sp);
1284 address stack_yellow_zone_base() {
1285 return (address)(stack_base() -
1286 (stack_size() -
1287 (stack_red_zone_size() + stack_yellow_zone_size())));
1288 }
1289 size_t stack_yellow_zone_size() {
1290 return StackYellowPages * os::vm_page_size();
1291 }
1292 address stack_red_zone_base() {
1293 return (address)(stack_base() - (stack_size() - stack_red_zone_size()));
1294 }
1295 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); }
1296 bool in_stack_yellow_zone(address a) {
1297 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base());
1298 }
1299 bool in_stack_red_zone(address a) {
1300 return (a <= stack_red_zone_base()) &&
1301 (a >= (address)((intptr_t)stack_base() - stack_size()));
1302 }
1303
1304 void create_stack_guard_pages();
1305 void remove_stack_guard_pages();
1306
1307 void enable_stack_yellow_zone();
1308 void disable_stack_yellow_zone();
1309 void enable_stack_red_zone();
1310 void disable_stack_red_zone();
1311
1312 inline bool stack_guard_zone_unused();
1313 inline bool stack_yellow_zone_disabled();
1314 inline bool stack_yellow_zone_enabled();
1315
1316 // Attempt to reguard the stack after a stack overflow may have occurred.
1317 // Returns true if (a) guard pages are not needed on this thread, (b) the
1318 // pages are already guarded, or (c) the pages were successfully reguarded.
1319 // Returns false if there is not enough stack space to reguard the pages, in
1320 // which case the caller should unwind a frame and try again. The argument
1321 // should be the caller's (approximate) sp.
1322 bool reguard_stack(address cur_sp);
1323 // Similar to above but see if current stackpoint is out of the guard area
1324 // and reguard if possible.
1325 bool reguard_stack(void);
1326
1327 address stack_overflow_limit() { return _stack_overflow_limit; }
1328 void set_stack_overflow_limit() {
1329 _stack_overflow_limit = _stack_base - _stack_size +
1330 ((StackShadowPages +
1331 StackYellowPages +
1332 StackRedPages) * os::vm_page_size());
1333 }
1334
1335 // Misc. accessors/mutators
1336 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1337 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1338 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1339
1340 #ifndef PRODUCT
1341 void record_jump(address target, address instr, const char* file, int line);
1342 #endif // PRODUCT
1343
1344 // For assembly stub generation
1345 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1346 #ifndef PRODUCT
1347 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1348 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1349 #endif // PRODUCT
1350 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1351 static ByteSize last_Java_sp_offset() {
1352 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1353 }
1354 static ByteSize last_Java_pc_offset() {
1355 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1356 }
1357 static ByteSize frame_anchor_offset() {
1358 return byte_offset_of(JavaThread, _anchor);
1359 }
1360 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1361 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1362 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1363 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1364 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1365 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1366 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1367 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1368 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1369 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1370 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1371 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1372 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1373
1374 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1375 static ByteSize should_post_on_exceptions_flag_offset() {
1376 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1377 }
1378
1379 #if INCLUDE_ALL_GCS
1380 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1381 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1382 #endif // INCLUDE_ALL_GCS
1383
1384 // Returns the jni environment for this thread
1385 JNIEnv* jni_environment() { return &_jni_environment; }
1386
1387 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1388 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1389 // Only return NULL if thread is off the thread list; starting to
1390 // exit should not return NULL.
1391 if (thread_from_jni_env->is_terminated()) {
1392 thread_from_jni_env->block_if_vm_exited();
1393 return NULL;
1394 } else {
1395 return thread_from_jni_env;
1396 }
1397 }
1398
1399 // JNI critical regions. These can nest.
1400 bool in_critical() { return _jni_active_critical > 0; }
1401 bool in_last_critical() { return _jni_active_critical == 1; }
1402 void enter_critical() {
1403 assert(Thread::current() == this ||
1404 (Thread::current()->is_VM_thread() &&
1405 SafepointSynchronize::is_synchronizing()),
1406 "this must be current thread or synchronizing");
1407 _jni_active_critical++;
1408 }
1409 void exit_critical() {
1410 assert(Thread::current() == this, "this must be current thread");
1411 _jni_active_critical--;
1412 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1413 }
1414
1415 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1416 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1417 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1418 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1419 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1420
1421 // For deadlock detection
1422 int depth_first_number() { return _depth_first_number; }
1423 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1424
1425 private:
1426 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1427
1428 public:
1429 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1430 void add_monitor_chunk(MonitorChunk* chunk);
1431 void remove_monitor_chunk(MonitorChunk* chunk);
1432 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1433 void inc_in_deopt_handler() { _in_deopt_handler++; }
1434 void dec_in_deopt_handler() {
1435 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1436 if (_in_deopt_handler > 0) { // robustness
1437 _in_deopt_handler--;
1438 }
1439 }
1440
1441 private:
1442 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1443
1444 public:
1445
1446 // Frame iteration; calls the function f for all frames on the stack
1447 void frames_do(void f(frame*, const RegisterMap*));
1448
1449 // Memory operations
1450 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1451
1452 // Sweeper operations
1453 void nmethods_do(CodeBlobClosure* cf);
1454
1455 // RedefineClasses Support
1456 void metadata_do(void f(Metadata*));
1457
1458 // Misc. operations
1459 char* name() const { return (char*)get_thread_name(); }
1460 void print_on(outputStream* st) const;
1461 void print_value();
1462 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1463 void print_thread_state() const PRODUCT_RETURN;
1464 void print_on_error(outputStream* st, char* buf, int buflen) const;
1465 void verify();
1466 const char* get_thread_name() const;
1467 private:
1468 // factor out low-level mechanics for use in both normal and error cases
1469 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1470 public:
1471 const char* get_threadgroup_name() const;
1472 const char* get_parent_name() const;
1473
1474 // Accessing frames
1475 frame last_frame() {
1476 _anchor.make_walkable(this);
1477 return pd_last_frame();
1478 }
1479 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1480
1481 // Returns method at 'depth' java or native frames down the stack
1482 // Used for security checks
1483 Klass* security_get_caller_class(int depth);
1484
1485 // Print stack trace in external format
1486 void print_stack_on(outputStream* st);
1487 void print_stack() { print_stack_on(tty); }
1488
1489 // Print stack traces in various internal formats
1490 void trace_stack() PRODUCT_RETURN;
1491 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1492 void trace_frames() PRODUCT_RETURN;
1493 void trace_oops() PRODUCT_RETURN;
1494
1495 // Print an annotated view of the stack frames
1496 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1497 void validate_frame_layout() {
1498 print_frame_layout(0, true);
1499 }
1500
1501 // Returns the number of stack frames on the stack
1502 int depth() const;
1503
1504 // Function for testing deoptimization
1505 void deoptimize();
1506 void make_zombies();
1507
1508 void deoptimized_wrt_marked_nmethods();
1509
1510 // Profiling operation (see fprofile.cpp)
1511 public:
1512 bool profile_last_Java_frame(frame* fr);
1513
1514 private:
1515 ThreadProfiler* _thread_profiler;
1516 private:
1517 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1518 friend class FlatProfilerTask; // uses get_thread_profiler.
1519 friend class ThreadProfilerMark; // uses get_thread_profiler.
1520 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1521 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1522 ThreadProfiler* result = _thread_profiler;
1523 _thread_profiler = tp;
1524 return result;
1525 }
1526
1527 public:
1528 // Returns the running thread as a JavaThread
1529 static inline JavaThread* current();
1530
1531 // Returns the active Java thread. Do not use this if you know you are calling
1532 // from a JavaThread, as it's slower than JavaThread::current. If called from
1533 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1534 // operation. You may not want that either.
1535 static JavaThread* active();
1536
1537 inline CompilerThread* as_CompilerThread();
1538
1539 public:
1540 virtual void run();
1541 void thread_main_inner();
1542
1543 private:
1544 // PRIVILEGED STACK
1545 PrivilegedElement* _privileged_stack_top;
1546 GrowableArray<oop>* _array_for_gc;
1547 public:
1548
1549 // Returns the privileged_stack information.
1550 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1551 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1552 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1553
1554 public:
1555 // Thread local information maintained by JVMTI.
1556 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1557 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1558 // getter is used to get this JavaThread's JvmtiThreadState if it has
1559 // one which means NULL can be returned. JvmtiThreadState::state_for()
1560 // is used to get the specified JavaThread's JvmtiThreadState if it has
1561 // one or it allocates a new JvmtiThreadState for the JavaThread and
1562 // returns it. JvmtiThreadState::state_for() will return NULL only if
1563 // the specified JavaThread is exiting.
1564 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1565 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1566 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1567 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1568
1569 // JVMTI PopFrame support
1570 // Setting and clearing popframe_condition
1571 // All of these enumerated values are bits. popframe_pending
1572 // indicates that a PopFrame() has been requested and not yet been
1573 // completed. popframe_processing indicates that that PopFrame() is in
1574 // the process of being completed. popframe_force_deopt_reexecution_bit
1575 // indicates that special handling is required when returning to a
1576 // deoptimized caller.
1577 enum PopCondition {
1578 popframe_inactive = 0x00,
1579 popframe_pending_bit = 0x01,
1580 popframe_processing_bit = 0x02,
1581 popframe_force_deopt_reexecution_bit = 0x04
1582 };
1583 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1584 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1585 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1586 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1587 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1588 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1589 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1590 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1591 #ifdef CC_INTERP
1592 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1593 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1594 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1595 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1596 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1597 #endif
1598
1599 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1600 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1601 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1602
1603 private:
1604 // Saved incoming arguments to popped frame.
1605 // Used only when popped interpreted frame returns to deoptimized frame.
1606 void* _popframe_preserved_args;
1607 int _popframe_preserved_args_size;
1608
1609 public:
1610 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1611 void* popframe_preserved_args();
1612 ByteSize popframe_preserved_args_size();
1613 WordSize popframe_preserved_args_size_in_words();
1614 void popframe_free_preserved_args();
1615
1616
1617 private:
1618 JvmtiThreadState *_jvmti_thread_state;
1619 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1620
1621 // Used by the interpreter in fullspeed mode for frame pop, method
1622 // entry, method exit and single stepping support. This field is
1623 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1624 // It can be set to zero asynchronously (i.e., without a VM operation
1625 // or a lock) so we have to be very careful.
1626 int _interp_only_mode;
1627
1628 public:
1629 // used by the interpreter for fullspeed debugging support (see above)
1630 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1631 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1632 int get_interp_only_mode() { return _interp_only_mode; }
1633 void increment_interp_only_mode() { ++_interp_only_mode; }
1634 void decrement_interp_only_mode() { --_interp_only_mode; }
1635
1636 // support for cached flag that indicates whether exceptions need to be posted for this thread
1637 // if this is false, we can avoid deoptimizing when events are thrown
1638 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1639 private:
1640 int _should_post_on_exceptions_flag;
1641
1642 public:
1643 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1644 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1645
1646 private:
1647 ThreadStatistics *_thread_stat;
1648
1649 public:
1650 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1651
1652 // Return a blocker object for which this thread is blocked parking.
1653 oop current_park_blocker();
1654
1655 private:
1656 static size_t _stack_size_at_create;
1657
1658 public:
1659 static inline size_t stack_size_at_create(void) {
1660 return _stack_size_at_create;
1661 }
1662 static inline void set_stack_size_at_create(size_t value) {
1663 _stack_size_at_create = value;
1664 }
1665
1666 #if INCLUDE_ALL_GCS
1667 // SATB marking queue support
1668 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1669 static SATBMarkQueueSet& satb_mark_queue_set() {
1670 return _satb_mark_queue_set;
1671 }
1672
1673 // Dirty card queue support
1674 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1675 static DirtyCardQueueSet& dirty_card_queue_set() {
1676 return _dirty_card_queue_set;
1677 }
1678 #endif // INCLUDE_ALL_GCS
1679
1680 // This method initializes the SATB and dirty card queues before a
1681 // JavaThread is added to the Java thread list. Right now, we don't
1682 // have to do anything to the dirty card queue (it should have been
1683 // activated when the thread was created), but we have to activate
1684 // the SATB queue if the thread is created while a marking cycle is
1685 // in progress. The activation / de-activation of the SATB queues at
1686 // the beginning / end of a marking cycle is done during safepoints
1687 // so we have to make sure this method is called outside one to be
1688 // able to safely read the active field of the SATB queue set. Right
1689 // now, it is called just before the thread is added to the Java
1690 // thread list in the Threads::add() method. That method is holding
1691 // the Threads_lock which ensures we are outside a safepoint. We
1692 // cannot do the obvious and set the active field of the SATB queue
1693 // when the thread is created given that, in some cases, safepoints
1694 // might happen between the JavaThread constructor being called and the
1695 // thread being added to the Java thread list (an example of this is
1696 // when the structure for the DestroyJavaVM thread is created).
1697 #if INCLUDE_ALL_GCS
1698 void initialize_queues();
1699 #else // INCLUDE_ALL_GCS
1700 void initialize_queues() { }
1701 #endif // INCLUDE_ALL_GCS
1702
1703 // Machine dependent stuff
1704 #ifdef TARGET_OS_ARCH_linux_x86
1705 # include "thread_linux_x86.hpp"
1706 #endif
1707 #ifdef TARGET_OS_ARCH_linux_sparc
1708 # include "thread_linux_sparc.hpp"
1709 #endif
1710 #ifdef TARGET_OS_ARCH_linux_zero
1711 # include "thread_linux_zero.hpp"
1712 #endif
1713 #ifdef TARGET_OS_ARCH_solaris_x86
1714 # include "thread_solaris_x86.hpp"
1715 #endif
1716 #ifdef TARGET_OS_ARCH_solaris_sparc
1717 # include "thread_solaris_sparc.hpp"
1718 #endif
1719 #ifdef TARGET_OS_ARCH_windows_x86
1720 # include "thread_windows_x86.hpp"
1721 #endif
1722 #ifdef TARGET_OS_ARCH_linux_arm
1723 # include "thread_linux_arm.hpp"
1724 #endif
1725 #ifdef TARGET_OS_ARCH_linux_ppc
1726 # include "thread_linux_ppc.hpp"
1727 #endif
1728 #ifdef TARGET_OS_ARCH_linux_aarch64
1729 # include "thread_linux_aarch64.hpp"
1730 #endif
1731 #ifdef TARGET_OS_ARCH_aix_ppc
1732 # include "thread_aix_ppc.hpp"
1733 #endif
1734 #ifdef TARGET_OS_ARCH_bsd_x86
1735 # include "thread_bsd_x86.hpp"
1736 #endif
1737 #ifdef TARGET_OS_ARCH_bsd_zero
1738 # include "thread_bsd_zero.hpp"
1739 #endif
1740
1741
1742 public:
1743 void set_blocked_on_compilation(bool value) {
1744 _blocked_on_compilation = value;
1745 }
1746
1747 bool blocked_on_compilation() {
1748 return _blocked_on_compilation;
1749 }
1750 protected:
1751 bool _blocked_on_compilation;
1752
1753
1754 // JSR166 per-thread parker
1755 private:
1756 Parker* _parker;
1757 public:
1758 Parker* parker() { return _parker; }
1759
1760 // Biased locking support
1761 private:
1762 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1763 public:
1764 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1765 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1766
1767 // clearing/querying jni attach status
1768 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1769 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1770 inline void set_done_attaching_via_jni();
1771 private:
1772 // This field is used to determine if a thread has claimed
1773 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1774 // otherwise its value is the par_id that has been claimed.
1775 uint _claimed_par_id;
1776 public:
1777 uint get_claimed_par_id() { return _claimed_par_id; }
1778 void set_claimed_par_id(uint id) { _claimed_par_id = id; }
1779 };
1780
1781 // Inline implementation of JavaThread::current
1782 inline JavaThread* JavaThread::current() {
1783 Thread* thread = ThreadLocalStorage::thread();
1784 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1785 return (JavaThread*)thread;
1786 }
1787
1788 inline CompilerThread* JavaThread::as_CompilerThread() {
1789 assert(is_Compiler_thread(), "just checking");
1790 return (CompilerThread*)this;
1791 }
1792
1793 // Dedicated thread to sweep the code cache
1794 class CodeCacheSweeperThread : public JavaThread {
1795 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1796 public:
1797 CodeCacheSweeperThread();
1798 // Track the nmethod currently being scanned by the sweeper
1799 void set_scanned_nmethod(nmethod* nm) {
1800 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1801 _scanned_nmethod = nm;
1802 }
1803
1804 // Hide sweeper thread from external view.
1805 bool is_hidden_from_external_view() const { return true; }
1806
1807 bool is_Code_cache_sweeper_thread() const { return true; }
1808 // GC support
1809 // Apply "f->do_oop" to all root oops in "this".
1810 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1811 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1812 };
1813
1814 // A thread used for Compilation.
1815 class CompilerThread : public JavaThread {
1816 friend class VMStructs;
1817 private:
1818 CompilerCounters* _counters;
1819
1820 ciEnv* _env;
1821 CompileLog* _log;
1822 CompileTask* _task;
1823 CompileQueue* _queue;
1824 BufferBlob* _buffer_blob;
1825
1826 AbstractCompiler* _compiler;
1827
1828 public:
1829
1830 static CompilerThread* current();
1831
1832 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1833
1834 bool is_Compiler_thread() const { return true; }
1835 // Hide this compiler thread from external view.
1836 bool is_hidden_from_external_view() const { return true; }
1837
1838 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1839 AbstractCompiler* compiler() const { return _compiler; }
1840
1841 CompileQueue* queue() const { return _queue; }
1842 CompilerCounters* counters() const { return _counters; }
1843
1844 // Get/set the thread's compilation environment.
1845 ciEnv* env() { return _env; }
1846 void set_env(ciEnv* env) { _env = env; }
1847
1848 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1849 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
1850
1851 // Get/set the thread's logging information
1852 CompileLog* log() { return _log; }
1853 void init_log(CompileLog* log) {
1854 // Set once, for good.
1855 assert(_log == NULL, "set only once");
1856 _log = log;
1857 }
1858
1859 #ifndef PRODUCT
1860 private:
1861 IdealGraphPrinter *_ideal_graph_printer;
1862 public:
1863 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1864 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1865 #endif
1866
1867 // Get/set the thread's current task
1868 CompileTask* task() { return _task; }
1869 void set_task(CompileTask* task) { _task = task; }
1870 };
1871
1872 inline CompilerThread* CompilerThread::current() {
1873 return JavaThread::current()->as_CompilerThread();
1874 }
1875
1876 // The active thread queue. It also keeps track of the current used
1877 // thread priorities.
1878 class Threads: AllStatic {
1879 friend class VMStructs;
1880 private:
1881 static JavaThread* _thread_list;
1882 static int _number_of_threads;
1883 static int _number_of_non_daemon_threads;
1884 static int _return_code;
1885 static int _thread_claim_parity;
1886 #ifdef ASSERT
1887 static bool _vm_complete;
1888 #endif
1889
1890 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
1891 static void initialize_jsr292_core_classes(TRAPS);
1892 public:
1893 // Thread management
1894 // force_daemon is a concession to JNI, where we may need to add a
1895 // thread to the thread list before allocating its thread object
1896 static void add(JavaThread* p, bool force_daemon = false);
1897 static void remove(JavaThread* p);
1898 static bool includes(JavaThread* p);
1899 static JavaThread* first() { return _thread_list; }
1900 static void threads_do(ThreadClosure* tc);
1901
1902 // Initializes the vm and creates the vm thread
1903 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1904 static void convert_vm_init_libraries_to_agents();
1905 static void create_vm_init_libraries();
1906 static void create_vm_init_agents();
1907 static void shutdown_vm_agents();
1908 static bool destroy_vm();
1909 // Supported VM versions via JNI
1910 // Includes JNI_VERSION_1_1
1911 static jboolean is_supported_jni_version_including_1_1(jint version);
1912 // Does not include JNI_VERSION_1_1
1913 static jboolean is_supported_jni_version(jint version);
1914
1915 // The "thread claim parity" provides a way for threads to be claimed
1916 // by parallel worker tasks.
1917 //
1918 // Each thread contains a a "parity" field. A task will claim the
1919 // thread only if its parity field is the same as the global parity,
1920 // which is updated by calling change_thread_claim_parity().
1921 //
1922 // For this to work change_thread_claim_parity() needs to be called
1923 // exactly once in sequential code before starting parallel tasks
1924 // that should claim threads.
1925 //
1926 // New threads get their parity set to 0 and change_thread_claim_parity()
1927 // never set the global parity to 0.
1928 static int thread_claim_parity() { return _thread_claim_parity; }
1929 static void change_thread_claim_parity();
1930 static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
1931
1932 // Apply "f->do_oop" to all root oops in all threads.
1933 // This version may only be called by sequential code.
1934 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1935 // This version may be called by sequential or parallel code.
1936 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1937 // This creates a list of GCTasks, one per thread.
1938 static void create_thread_roots_tasks(GCTaskQueue* q);
1939 // This creates a list of GCTasks, one per thread, for marking objects.
1940 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1941
1942 // Apply "f->do_oop" to roots in all threads that
1943 // are part of compiled frames
1944 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1945
1946 static void convert_hcode_pointers();
1947 static void restore_hcode_pointers();
1948
1949 // Sweeper
1950 static void nmethods_do(CodeBlobClosure* cf);
1951
1952 // RedefineClasses support
1953 static void metadata_do(void f(Metadata*));
1954 static void metadata_handles_do(void f(Metadata*));
1955
1956 #ifdef ASSERT
1957 static bool is_vm_complete() { return _vm_complete; }
1958 #endif
1959
1960 // Verification
1961 static void verify();
1962 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1963 static void print(bool print_stacks, bool internal_format) {
1964 // this function is only used by debug.cpp
1965 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1966 }
1967 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1968
1969 // Get Java threads that are waiting to enter a monitor. If doLock
1970 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1971 // VM needs to be at a safepoint.
1972 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1973 address monitor, bool doLock);
1974
1975 // Get owning Java thread from the monitor's owner field. If doLock
1976 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1977 // VM needs to be at a safepoint.
1978 static JavaThread *owning_thread_from_monitor_owner(address owner,
1979 bool doLock);
1980
1981 // Number of threads on the active threads list
1982 static int number_of_threads() { return _number_of_threads; }
1983 // Number of non-daemon threads on the active threads list
1984 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1985
1986 // Deoptimizes all frames tied to marked nmethods
1987 static void deoptimized_wrt_marked_nmethods();
1988
1989 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
1990
1991 };
1992
1993
1994 // Thread iterator
1995 class ThreadClosure: public StackObj {
1996 public:
1997 virtual void do_thread(Thread* thread) = 0;
1998 };
1999
2000 class SignalHandlerMark: public StackObj {
2001 private:
2002 Thread* _thread;
2003 public:
2004 SignalHandlerMark(Thread* t) {
2005 _thread = t;
2006 if (_thread) _thread->enter_signal_handler();
2007 }
2008 ~SignalHandlerMark() {
2009 if (_thread) _thread->leave_signal_handler();
2010 _thread = NULL;
2011 }
2012 };
2013
2014
2015 #endif // SHARE_VM_RUNTIME_THREAD_HPP