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/thread_ext.hpp"
43 #include "runtime/unhandledOops.hpp"
44 #include "trace/traceBackend.hpp"
45 #include "trace/traceMacros.hpp"
46 #include "utilities/exceptions.hpp"
47 #include "utilities/macros.hpp"
48 #include "utilities/top.hpp"
49 #if INCLUDE_ALL_GCS
50 #include "gc/g1/dirtyCardQueue.hpp"
51 #include "gc/g1/satbQueue.hpp"
52 #endif // INCLUDE_ALL_GCS
53 #ifdef TARGET_ARCH_zero
54 # include "stack_zero.hpp"
55 #endif
56
57 class ThreadSafepointState;
58 class ThreadProfiler;
59
60 class JvmtiThreadState;
61 class JvmtiGetLoadedClassesClosure;
62 class ThreadStatistics;
63 class ConcurrentLocksDump;
64 class ParkEvent;
65 class Parker;
66
67 class ciEnv;
68 class CompileThread;
69 class CompileLog;
70 class CompileTask;
71 class CompileQueue;
72 class CompilerCounters;
73 class vframeArray;
74
75 class DeoptResourceMark;
76 class jvmtiDeferredLocalVariableSet;
77
78 class GCTaskQueue;
79 class ThreadClosure;
80 class IdealGraphPrinter;
81
82 class Metadata;
83 template <class T, MEMFLAGS F> class ChunkedList;
84 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
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 // Current thread is maintained as a thread-local variable
105 static THREAD_LOCAL_DECL Thread* _thr_current;
106
107 // Exception handling
108 // (Note: _pending_exception and friends are in ThreadShadow)
109 //oop _pending_exception; // pending exception for current thread
110 // const char* _exception_file; // file information for exception (debugging only)
111 // int _exception_line; // line information for exception (debugging only)
112 protected:
113 // Support for forcing alignment of thread objects for biased locking
114 void* _real_malloc_address;
115 public:
116 void* operator new(size_t size) throw() { return allocate(size, true); }
117 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
118 return allocate(size, false); }
119 void operator delete(void* p);
120
121 protected:
122 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
123 private:
124
125 // ***************************************************************
126 // Suspend and resume support
127 // ***************************************************************
128 //
129 // VM suspend/resume no longer exists - it was once used for various
130 // things including safepoints but was deprecated and finally removed
131 // in Java 7. Because VM suspension was considered "internal" Java-level
132 // suspension was considered "external", and this legacy naming scheme
133 // remains.
134 //
135 // External suspend/resume requests come from JVM_SuspendThread,
136 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
137 // ResumeThread. External
138 // suspend requests cause _external_suspend to be set and external
139 // resume requests cause _external_suspend to be cleared.
140 // External suspend requests do not nest on top of other external
141 // suspend requests. The higher level APIs reject suspend requests
142 // for already suspended threads.
143 //
144 // The external_suspend
145 // flag is checked by has_special_runtime_exit_condition() and java thread
146 // will self-suspend when handle_special_runtime_exit_condition() is
147 // called. Most uses of the _thread_blocked state in JavaThreads are
148 // considered the same as being externally suspended; if the blocking
149 // condition lifts, the JavaThread will self-suspend. Other places
150 // where VM checks for external_suspend include:
151 // + mutex granting (do not enter monitors when thread is suspended)
152 // + state transitions from _thread_in_native
153 //
154 // In general, java_suspend() does not wait for an external suspend
155 // request to complete. When it returns, the only guarantee is that
156 // the _external_suspend field is true.
157 //
158 // wait_for_ext_suspend_completion() is used to wait for an external
159 // suspend request to complete. External suspend requests are usually
160 // followed by some other interface call that requires the thread to
161 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
162 // the interface that requires quiescence, we give the JavaThread a
163 // chance to self-suspend before we need it to be quiescent. This
164 // improves overall suspend/query performance.
165 //
166 // _suspend_flags controls the behavior of java_ suspend/resume.
167 // It must be set under the protection of SR_lock. Read from the flag is
168 // OK without SR_lock as long as the value is only used as a hint.
169 // (e.g., check _external_suspend first without lock and then recheck
170 // inside SR_lock and finish the suspension)
171 //
172 // _suspend_flags is also overloaded for other "special conditions" so
173 // that a single check indicates whether any special action is needed
174 // eg. for async exceptions.
175 // -------------------------------------------------------------------
176 // Notes:
177 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
178 // but we still update its value to keep other part of the system (mainly
179 // JVMTI) happy. ThreadState is legacy code (see notes in
180 // osThread.hpp).
181 //
182 // 2. It would be more natural if set_external_suspend() is private and
183 // part of java_suspend(), but that probably would affect the suspend/query
184 // performance. Need more investigation on this.
185
186 // suspend/resume lock: used for self-suspend
187 Monitor* _SR_lock;
188
189 protected:
190 enum SuspendFlags {
191 // NOTE: avoid using the sign-bit as cc generates different test code
192 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
193
194 _external_suspend = 0x20000000U, // thread is asked to self suspend
195 _ext_suspended = 0x40000000U, // thread has self-suspended
196 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
197
198 _has_async_exception = 0x00000001U, // there is a pending async exception
199 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
200 };
201
202 // various suspension related flags - atomically updated
203 // overloaded for async exception checking in check_special_condition_for_native_trans.
204 volatile uint32_t _suspend_flags;
205
206 private:
207 int _num_nested_signal;
208
209 DEBUG_ONLY(bool _suspendible_thread;)
210
211 public:
212 void enter_signal_handler() { _num_nested_signal++; }
213 void leave_signal_handler() { _num_nested_signal--; }
214 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
215
216 #ifdef ASSERT
217 void set_suspendible_thread() {
218 _suspendible_thread = true;
219 }
220
221 void clear_suspendible_thread() {
222 _suspendible_thread = false;
223 }
224
225 bool is_suspendible_thread() { return _suspendible_thread; }
226 #endif
227
228 private:
229 // Active_handles points to a block of handles
230 JNIHandleBlock* _active_handles;
231
232 // One-element thread local free list
233 JNIHandleBlock* _free_handle_block;
234
235 // Point to the last handle mark
236 HandleMark* _last_handle_mark;
237
238 // The parity of the last strong_roots iteration in which this thread was
239 // claimed as a task.
240 jint _oops_do_parity;
241
242 public:
243 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
244 HandleMark* last_handle_mark() const { return _last_handle_mark; }
245 private:
246
247 // debug support for checking if code does allow safepoints or not
248 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
249 // mutex, or blocking on an object synchronizer (Java locking).
250 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
251 // If !allow_allocation(), then an assertion failure will happen during allocation
252 // (Hence, !allow_safepoint() => !allow_allocation()).
253 //
254 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
255 //
256 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
257 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
258
259 // Used by SkipGCALot class.
260 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
261
262 friend class No_Alloc_Verifier;
263 friend class No_Safepoint_Verifier;
264 friend class Pause_No_Safepoint_Verifier;
265 friend class GC_locker;
266
267 ThreadLocalAllocBuffer _tlab; // Thread-local eden
268 jlong _allocated_bytes; // Cumulative number of bytes allocated on
269 // the Java heap
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 // Manage Thread::current()
312 void initialize_thread_current();
313 private:
314 void clear_thread_current(); // needed for detaching JNI threads
315
316 public:
317 // thread entry point
318 virtual void run();
319
320 // Testers
321 virtual bool is_VM_thread() const { return false; }
322 virtual bool is_Java_thread() const { return false; }
323 virtual bool is_Compiler_thread() const { return false; }
324 virtual bool is_Code_cache_sweeper_thread() const { return false; }
325 virtual bool is_hidden_from_external_view() const { return false; }
326 virtual bool is_jvmti_agent_thread() const { return false; }
327 // True iff the thread can perform GC operations at a safepoint.
328 // Generally will be true only of VM thread and parallel GC WorkGang
329 // threads.
330 virtual bool is_GC_task_thread() const { return false; }
331 virtual bool is_Watcher_thread() const { return false; }
332 virtual bool is_ConcurrentGC_thread() const { return false; }
333 virtual bool is_Named_thread() const { return false; }
334 virtual bool is_Worker_thread() const { return false; }
335
336 // Can this thread make Java upcalls
337 virtual bool can_call_java() const { return false; }
338
339 // Casts
340 virtual WorkerThread* as_Worker_thread() const { return NULL; }
341
342 virtual char* name() const { return (char*)"Unknown thread"; }
343
344 // Returns the current thread (ASSERTS if NULL)
345 static inline Thread* current();
346 // Returns the current thread, or NULL if not attached
347 static inline Thread* current_or_null();
348
349 // Common thread operations
350 static void set_priority(Thread* thread, ThreadPriority priority);
351 static ThreadPriority get_priority(const Thread* const thread);
352 static void start(Thread* thread);
353 static void interrupt(Thread* thr);
354 static bool is_interrupted(Thread* thr, bool clear_interrupted);
355
356 void set_native_thread_name(const char *name) {
357 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
358 os::set_native_thread_name(name);
359 }
360
361 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
362 Monitor* SR_lock() const { return _SR_lock; }
363
364 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
365
366 inline void set_suspend_flag(SuspendFlags f);
367 inline void clear_suspend_flag(SuspendFlags f);
368
369 inline void set_has_async_exception();
370 inline void clear_has_async_exception();
371
372 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
373
374 inline void set_critical_native_unlock();
375 inline void clear_critical_native_unlock();
376
377 // Support for Unhandled Oop detection
378 // Add the field for both, fastdebug and debug, builds to keep
379 // Thread's fields layout the same.
380 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build.
381 #ifdef CHECK_UNHANDLED_OOPS
382 private:
383 UnhandledOops* _unhandled_oops;
384 #elif defined(ASSERT)
385 private:
386 void* _unhandled_oops;
387 #endif
388 #ifdef CHECK_UNHANDLED_OOPS
389 public:
390 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
391 // Mark oop safe for gc. It may be stack allocated but won't move.
392 void allow_unhandled_oop(oop *op) {
393 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
394 }
395 // Clear oops at safepoint so crashes point to unhandled oop violator
396 void clear_unhandled_oops() {
397 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
398 }
399 #endif // CHECK_UNHANDLED_OOPS
400
401 public:
402 #ifndef PRODUCT
403 bool skip_gcalot() { return _skip_gcalot; }
404 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
405 #endif
406
407 // Installs a pending exception to be inserted later
408 static void send_async_exception(oop thread_oop, oop java_throwable);
409
410 // Resource area
411 ResourceArea* resource_area() const { return _resource_area; }
412 void set_resource_area(ResourceArea* area) { _resource_area = area; }
413
414 OSThread* osthread() const { return _osthread; }
415 void set_osthread(OSThread* thread) { _osthread = thread; }
416
417 // JNI handle support
418 JNIHandleBlock* active_handles() const { return _active_handles; }
419 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
420 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
421 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
422
423 // Internal handle support
424 HandleArea* handle_area() const { return _handle_area; }
425 void set_handle_area(HandleArea* area) { _handle_area = area; }
426
427 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
428 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
429
430 // Thread-Local Allocation Buffer (TLAB) support
431 ThreadLocalAllocBuffer& tlab() { return _tlab; }
432 void initialize_tlab() {
433 if (UseTLAB) {
434 tlab().initialize();
435 }
436 }
437
438 jlong allocated_bytes() { return _allocated_bytes; }
439 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
440 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
441 inline jlong cooked_allocated_bytes();
442
443 TRACE_DATA* trace_data() { return &_trace_data; }
444
445 const ThreadExt& ext() const { return _ext; }
446 ThreadExt& ext() { return _ext; }
447
448 // VM operation support
449 int vm_operation_ticket() { return ++_vm_operation_started_count; }
450 int vm_operation_completed_count() { return _vm_operation_completed_count; }
451 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
452
453 // For tracking the heavyweight monitor the thread is pending on.
454 ObjectMonitor* current_pending_monitor() {
455 return _current_pending_monitor;
456 }
457 void set_current_pending_monitor(ObjectMonitor* monitor) {
458 _current_pending_monitor = monitor;
459 }
460 void set_current_pending_monitor_is_from_java(bool from_java) {
461 _current_pending_monitor_is_from_java = from_java;
462 }
463 bool current_pending_monitor_is_from_java() {
464 return _current_pending_monitor_is_from_java;
465 }
466
467 // For tracking the ObjectMonitor on which this thread called Object.wait()
468 ObjectMonitor* current_waiting_monitor() {
469 return _current_waiting_monitor;
470 }
471 void set_current_waiting_monitor(ObjectMonitor* monitor) {
472 _current_waiting_monitor = monitor;
473 }
474
475 // GC support
476 // Apply "f->do_oop" to all root oops in "this".
477 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
478 // Used by JavaThread::oops_do.
479 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
480 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
481
482 // Handles the parallel case for the method below.
483 private:
484 bool claim_oops_do_par_case(int collection_parity);
485 public:
486 // Requires that "collection_parity" is that of the current roots
487 // iteration. If "is_par" is false, sets the parity of "this" to
488 // "collection_parity", and returns "true". If "is_par" is true,
489 // uses an atomic instruction to set the current threads parity to
490 // "collection_parity", if it is not already. Returns "true" iff the
491 // calling thread does the update, this indicates that the calling thread
492 // has claimed the thread's stack as a root groop in the current
493 // collection.
494 bool claim_oops_do(bool is_par, int collection_parity) {
495 if (!is_par) {
496 _oops_do_parity = collection_parity;
497 return true;
498 } else {
499 return claim_oops_do_par_case(collection_parity);
500 }
501 }
502
503 // Sweeper support
504 void nmethods_do(CodeBlobClosure* cf);
505
506 // jvmtiRedefineClasses support
507 void metadata_handles_do(void f(Metadata*));
508
509 // Used by fast lock support
510 virtual bool is_lock_owned(address adr) const;
511
512 // Check if address is in the stack of the thread (not just for locks).
513 // Warning: the method can only be used on the running thread
514 bool is_in_stack(address adr) const;
515 // Check if address is in the usable part of the stack (excludes protected
516 // guard pages)
517 bool is_in_usable_stack(address adr) const;
518
519 // Sets this thread as starting thread. Returns failure if thread
520 // creation fails due to lack of memory, too many threads etc.
521 bool set_as_starting_thread();
522
523 protected:
524 // OS data associated with the thread
525 OSThread* _osthread; // Platform-specific thread information
526
527 // Thread local resource area for temporary allocation within the VM
528 ResourceArea* _resource_area;
529
530 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
531
532 // Thread local handle area for allocation of handles within the VM
533 HandleArea* _handle_area;
534 GrowableArray<Metadata*>* _metadata_handles;
535
536 // Support for stack overflow handling, get_thread, etc.
537 address _stack_base;
538 size_t _stack_size;
539 uintptr_t _self_raw_id; // used by get_thread (mutable)
540 int _lgrp_id;
541
542 public:
543 // Stack overflow support
544 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
545
546 void set_stack_base(address base) { _stack_base = base; }
547 size_t stack_size() const { return _stack_size; }
548 void set_stack_size(size_t size) { _stack_size = size; }
549 void record_stack_base_and_size();
550
551 bool on_local_stack(address adr) const {
552 // QQQ this has knowledge of direction, ought to be a stack method
553 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
554 }
555
556 uintptr_t self_raw_id() { return _self_raw_id; }
557 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
558
559 int lgrp_id() const { return _lgrp_id; }
560 void set_lgrp_id(int value) { _lgrp_id = value; }
561
562 // Printing
563 virtual void print_on(outputStream* st) const;
564 void print() const { print_on(tty); }
565 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
566
567 // Debug-only code
568 #ifdef ASSERT
569 private:
570 // Deadlock detection support for Mutex locks. List of locks own by thread.
571 Monitor* _owned_locks;
572 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
573 // thus the friendship
574 friend class Mutex;
575 friend class Monitor;
576
577 public:
578 void print_owned_locks_on(outputStream* st) const;
579 void print_owned_locks() const { print_owned_locks_on(tty); }
580 Monitor* owned_locks() const { return _owned_locks; }
581 bool owns_locks() const { return owned_locks() != NULL; }
582 bool owns_locks_but_compiled_lock() const;
583 int oops_do_parity() const { return _oops_do_parity; }
584
585 // Deadlock detection
586 bool allow_allocation() { return _allow_allocation_count == 0; }
587 ResourceMark* current_resource_mark() { return _current_resource_mark; }
588 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
589 #endif
590
591 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
592
593 private:
594 volatile int _jvmti_env_iteration_count;
595
596 public:
597 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
598 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
599 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
600
601 // Code generation
602 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
603 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
604 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
605
606 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
607 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
608
609 #define TLAB_FIELD_OFFSET(name) \
610 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
611
612 TLAB_FIELD_OFFSET(start)
613 TLAB_FIELD_OFFSET(end)
614 TLAB_FIELD_OFFSET(top)
615 TLAB_FIELD_OFFSET(pf_top)
616 TLAB_FIELD_OFFSET(size) // desired_size
617 TLAB_FIELD_OFFSET(refill_waste_limit)
618 TLAB_FIELD_OFFSET(number_of_refills)
619 TLAB_FIELD_OFFSET(fast_refill_waste)
620 TLAB_FIELD_OFFSET(slow_allocations)
621
622 #undef TLAB_FIELD_OFFSET
623
624 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
625
626 public:
627 volatile intptr_t _Stalled;
628 volatile int _TypeTag;
629 ParkEvent * _ParkEvent; // for synchronized()
630 ParkEvent * _SleepEvent; // for Thread.sleep
631 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
632 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
633 int NativeSyncRecursion; // diagnostic
634
635 volatile int _OnTrap; // Resume-at IP delta
636 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
637 jint _hashStateX; // thread-specific hashCode generator state
638 jint _hashStateY;
639 jint _hashStateZ;
640 void * _schedctl;
641
642
643 volatile jint rng[4]; // RNG for spin loop
644
645 // Low-level leaf-lock primitives used to implement synchronization
646 // and native monitor-mutex infrastructure.
647 // Not for general synchronization use.
648 static void SpinAcquire(volatile int * Lock, const char * Name);
649 static void SpinRelease(volatile int * Lock);
650 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
651 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
652 static void muxRelease(volatile intptr_t * Lock);
653 };
654
655 // Inline implementation of Thread::current()
656 inline Thread* Thread::current() {
657 assert(_thr_current != NULL, "Thread::current() called on detached thread");
658 return _thr_current;
659 }
660
661 inline Thread* Thread::current_or_null() {
662 return _thr_current;
663 }
664
665 // Name support for threads. non-JavaThread subclasses with multiple
666 // uniquely named instances should derive from this.
667 class NamedThread: public Thread {
668 friend class VMStructs;
669 enum {
670 max_name_len = 64
671 };
672 private:
673 char* _name;
674 // log JavaThread being processed by oops_do
675 JavaThread* _processed_thread;
676 uint _gc_id; // The current GC id when a thread takes part in GC
677
678 public:
679 NamedThread();
680 ~NamedThread();
681 // May only be called once per thread.
682 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
683 void initialize_named_thread();
684 virtual bool is_Named_thread() const { return true; }
685 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
686 JavaThread *processed_thread() { return _processed_thread; }
687 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
688 virtual void print_on(outputStream* st) const;
689
690 void set_gc_id(uint gc_id) { _gc_id = gc_id; }
691 uint gc_id() { return _gc_id; }
692 };
693
694 // Worker threads are named and have an id of an assigned work.
695 class WorkerThread: public NamedThread {
696 private:
697 uint _id;
698 public:
699 WorkerThread() : _id(0) { }
700 virtual bool is_Worker_thread() const { return true; }
701
702 virtual WorkerThread* as_Worker_thread() const {
703 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
704 return (WorkerThread*) this;
705 }
706
707 void set_id(uint work_id) { _id = work_id; }
708 uint id() const { return _id; }
709 };
710
711 // A single WatcherThread is used for simulating timer interrupts.
712 class WatcherThread: public Thread {
713 friend class VMStructs;
714 public:
715 virtual void run();
716
717 private:
718 static WatcherThread* _watcher_thread;
719
720 static bool _startable;
721 // volatile due to at least one lock-free read
722 volatile static bool _should_terminate;
723
724 os::WatcherThreadCrashProtection* _crash_protection;
725 public:
726 enum SomeConstants {
727 delay_interval = 10 // interrupt delay in milliseconds
728 };
729
730 // Constructor
731 WatcherThread();
732
733 // Tester
734 bool is_Watcher_thread() const { return true; }
735
736 // Printing
737 char* name() const { return (char*)"VM Periodic Task Thread"; }
738 void print_on(outputStream* st) const;
739 void unpark();
740
741 // Returns the single instance of WatcherThread
742 static WatcherThread* watcher_thread() { return _watcher_thread; }
743
744 // Create and start the single instance of WatcherThread, or stop it on shutdown
745 static void start();
746 static void stop();
747 // Only allow start once the VM is sufficiently initialized
748 // Otherwise the first task to enroll will trigger the start
749 static void make_startable();
750
751 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
752 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
753 _crash_protection = crash_protection;
754 }
755
756 bool has_crash_protection() const { return _crash_protection != NULL; }
757 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
758
759 private:
760 int sleep() const;
761 };
762
763
764 class CompilerThread;
765
766 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
767
768 class JavaThread: public Thread {
769 friend class VMStructs;
770 friend class WhiteBox;
771 private:
772 JavaThread* _next; // The next thread in the Threads list
773 oop _threadObj; // The Java level thread object
774
775 #ifdef ASSERT
776 private:
777 int _java_call_counter;
778
779 public:
780 int java_call_counter() { return _java_call_counter; }
781 void inc_java_call_counter() { _java_call_counter++; }
782 void dec_java_call_counter() {
783 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
784 _java_call_counter--;
785 }
786 private: // restore original namespace restriction
787 #endif // ifdef ASSERT
788
789 #ifndef PRODUCT
790 public:
791 enum {
792 jump_ring_buffer_size = 16
793 };
794 private: // restore original namespace restriction
795 #endif
796
797 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
798
799 ThreadFunction _entry_point;
800
801 JNIEnv _jni_environment;
802
803 // Deopt support
804 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
805
806 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
807 // transition out of native
808 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
809 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
810 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
811 // Because deoptimization is lazy we must save jvmti requests to set locals
812 // in compiled frames until we deoptimize and we have an interpreter frame.
813 // This holds the pointer to array (yeah like there might be more than one) of
814 // description of compiled vframes that have locals that need to be updated.
815 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
816
817 // Handshake value for fixing 6243940. We need a place for the i2c
818 // adapter to store the callee Method*. This value is NEVER live
819 // across a gc point so it does NOT have to be gc'd
820 // The handshake is open ended since we can't be certain that it will
821 // be NULLed. This is because we rarely ever see the race and end up
822 // in handle_wrong_method which is the backend of the handshake. See
823 // code in i2c adapters and handle_wrong_method.
824
825 Method* _callee_target;
826
827 // Used to pass back results to the interpreter or generated code running Java code.
828 oop _vm_result; // oop result is GC-preserved
829 Metadata* _vm_result_2; // non-oop result
830
831 // See ReduceInitialCardMarks: this holds the precise space interval of
832 // the most recent slow path allocation for which compiled code has
833 // elided card-marks for performance along the fast-path.
834 MemRegion _deferred_card_mark;
835
836 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
837 // allocated during deoptimization
838 // and by JNI_MonitorEnter/Exit
839
840 // Async. requests support
841 enum AsyncRequests {
842 _no_async_condition = 0,
843 _async_exception,
844 _async_unsafe_access_error
845 };
846 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
847 oop _pending_async_exception;
848
849 // Safepoint support
850 public: // Expose _thread_state for SafeFetchInt()
851 volatile JavaThreadState _thread_state;
852 private:
853 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
854 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
855
856 // JavaThread termination support
857 enum TerminatedTypes {
858 _not_terminated = 0xDEAD - 2,
859 _thread_exiting, // JavaThread::exit() has been called for this thread
860 _thread_terminated, // JavaThread is removed from thread list
861 _vm_exited // JavaThread is still executing native code, but VM is terminated
862 // only VM_Exit can set _vm_exited
863 };
864
865 // In general a JavaThread's _terminated field transitions as follows:
866 //
867 // _not_terminated => _thread_exiting => _thread_terminated
868 //
869 // _vm_exited is a special value to cover the case of a JavaThread
870 // executing native code after the VM itself is terminated.
871 volatile TerminatedTypes _terminated;
872 // suspend/resume support
873 volatile bool _suspend_equivalent; // Suspend equivalent condition
874 jint _in_deopt_handler; // count of deoptimization
875 // handlers thread is in
876 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
877 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
878 // never locked) when throwing an exception. Used by interpreter only.
879
880 // JNI attach states:
881 enum JNIAttachStates {
882 _not_attaching_via_jni = 1, // thread is not attaching via JNI
883 _attaching_via_jni, // thread is attaching via JNI
884 _attached_via_jni // thread has attached via JNI
885 };
886
887 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
888 // A native thread that is attaching via JNI starts with a value
889 // of _attaching_via_jni and transitions to _attached_via_jni.
890 volatile JNIAttachStates _jni_attach_state;
891
892 public:
893 // State of the stack guard pages for this thread.
894 enum StackGuardState {
895 stack_guard_unused, // not needed
896 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
897 stack_guard_enabled // enabled
898 };
899
900 private:
901
902 #if INCLUDE_JVMCI
903 // The _pending_* fields below are used to communicate extra information
904 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
905
906 // Communicates the DeoptReason and DeoptAction of the uncommon trap
907 int _pending_deoptimization;
908
909 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
910 // before the monitor has been acquired.
911 bool _pending_monitorenter;
912
913 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
914 bool _pending_transfer_to_interpreter;
915
916 // An object that JVMCI compiled code can use to further describe and
917 // uniquely identify the speculative optimization guarded by the uncommon trap
918 oop _pending_failed_speculation;
919
920 // These fields are mutually exclusive in terms of live ranges.
921 union {
922 // Communicates the pc at which the most recent implicit exception occurred
923 // from the signal handler to a deoptimization stub.
924 address _implicit_exception_pc;
925
926 // Communicates an alternative call target to an i2c stub from a JavaCall .
927 address _alternate_call_target;
928 } _jvmci;
929
930 // Support for high precision, thread sensitive counters in JVMCI compiled code.
931 jlong* _jvmci_counters;
932
933 public:
934 static jlong* _jvmci_old_thread_counters;
935 static void collect_counters(typeArrayOop array);
936 private:
937 #endif // INCLUDE_JVMCI
938
939 StackGuardState _stack_guard_state;
940
941 // Precompute the limit of the stack as used in stack overflow checks.
942 // We load it from here to simplify the stack overflow check in assembly.
943 address _stack_overflow_limit;
944
945 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
946 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
947 // code)
948 volatile oop _exception_oop; // Exception thrown in compiled code
949 volatile address _exception_pc; // PC where exception happened
950 volatile address _exception_handler_pc; // PC for handler of exception
951 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
952
953 private:
954 // support for JNI critical regions
955 jint _jni_active_critical; // count of entries into JNI critical region
956
957 // Checked JNI: function name requires exception check
958 char* _pending_jni_exception_check_fn;
959
960 // For deadlock detection.
961 int _depth_first_number;
962
963 // JVMTI PopFrame support
964 // This is set to popframe_pending to signal that top Java frame should be popped immediately
965 int _popframe_condition;
966
967 // If reallocation of scalar replaced objects fails, we throw OOM
968 // and during exception propagation, pop the top
969 // _frames_to_pop_failed_realloc frames, the ones that reference
970 // failed reallocations.
971 int _frames_to_pop_failed_realloc;
972
973 #ifndef PRODUCT
974 int _jmp_ring_index;
975 struct {
976 // We use intptr_t instead of address so debugger doesn't try and display strings
977 intptr_t _target;
978 intptr_t _instruction;
979 const char* _file;
980 int _line;
981 } _jmp_ring[jump_ring_buffer_size];
982 #endif // PRODUCT
983
984 #if INCLUDE_ALL_GCS
985 // Support for G1 barriers
986
987 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
988 // Set of all such queues.
989 static SATBMarkQueueSet _satb_mark_queue_set;
990
991 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
992 // Set of all such queues.
993 static DirtyCardQueueSet _dirty_card_queue_set;
994
995 void flush_barrier_queues();
996 #endif // INCLUDE_ALL_GCS
997
998 friend class VMThread;
999 friend class ThreadWaitTransition;
1000 friend class VM_Exit;
1001
1002 void initialize(); // Initialized the instance variables
1003
1004 public:
1005 // Constructor
1006 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1007 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1008 ~JavaThread();
1009
1010 #ifdef ASSERT
1011 // verify this JavaThread hasn't be published in the Threads::list yet
1012 void verify_not_published();
1013 #endif
1014
1015 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1016 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1017 _jni_environment.functions = functionTable;
1018 }
1019 struct JNINativeInterface_* get_jni_functions() {
1020 return (struct JNINativeInterface_ *)_jni_environment.functions;
1021 }
1022
1023 // This function is called at thread creation to allow
1024 // platform specific thread variables to be initialized.
1025 void cache_global_variables();
1026
1027 // Executes Shutdown.shutdown()
1028 void invoke_shutdown_hooks();
1029
1030 // Cleanup on thread exit
1031 enum ExitType {
1032 normal_exit,
1033 jni_detach
1034 };
1035 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1036
1037 void cleanup_failed_attach_current_thread();
1038
1039 // Testers
1040 virtual bool is_Java_thread() const { return true; }
1041 virtual bool can_call_java() const { return true; }
1042
1043 // Thread chain operations
1044 JavaThread* next() const { return _next; }
1045 void set_next(JavaThread* p) { _next = p; }
1046
1047 // Thread oop. threadObj() can be NULL for initial JavaThread
1048 // (or for threads attached via JNI)
1049 oop threadObj() const { return _threadObj; }
1050 void set_threadObj(oop p) { _threadObj = p; }
1051
1052 ThreadPriority java_priority() const; // Read from threadObj()
1053
1054 // Prepare thread and add to priority queue. If a priority is
1055 // not specified, use the priority of the thread object. Threads_lock
1056 // must be held while this function is called.
1057 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1058 void prepare_ext();
1059
1060 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1061 address saved_exception_pc() { return _saved_exception_pc; }
1062
1063
1064 ThreadFunction entry_point() const { return _entry_point; }
1065
1066 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1067 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1068
1069 // Last frame anchor routines
1070
1071 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1072
1073 // last_Java_sp
1074 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1075 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1076
1077 // last_Java_pc
1078
1079 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1080
1081 // Safepoint support
1082 #if !(defined(PPC64) || defined(AARCH64))
1083 JavaThreadState thread_state() const { return _thread_state; }
1084 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1085 #else
1086 // Use membars when accessing volatile _thread_state. See
1087 // Threads::create_vm() for size checks.
1088 inline JavaThreadState thread_state() const;
1089 inline void set_thread_state(JavaThreadState s);
1090 #endif
1091 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1092 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1093 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1094
1095 // thread has called JavaThread::exit() or is terminated
1096 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1097 // thread is terminated (no longer on the threads list); we compare
1098 // against the two non-terminated values so that a freed JavaThread
1099 // will also be considered terminated.
1100 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1101 void set_terminated(TerminatedTypes t) { _terminated = t; }
1102 // special for Threads::remove() which is static:
1103 void set_terminated_value() { _terminated = _thread_terminated; }
1104 void block_if_vm_exited();
1105
1106 bool doing_unsafe_access() { return _doing_unsafe_access; }
1107 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1108
1109 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1110 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1111
1112 // Suspend/resume support for JavaThread
1113 private:
1114 inline void set_ext_suspended();
1115 inline void clear_ext_suspended();
1116
1117 public:
1118 void java_suspend();
1119 void java_resume();
1120 int java_suspend_self();
1121
1122 void check_and_wait_while_suspended() {
1123 assert(JavaThread::current() == this, "sanity check");
1124
1125 bool do_self_suspend;
1126 do {
1127 // were we externally suspended while we were waiting?
1128 do_self_suspend = handle_special_suspend_equivalent_condition();
1129 if (do_self_suspend) {
1130 // don't surprise the thread that suspended us by returning
1131 java_suspend_self();
1132 set_suspend_equivalent();
1133 }
1134 } while (do_self_suspend);
1135 }
1136 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1137 // Check for async exception in addition to safepoint and suspend request.
1138 static void check_special_condition_for_native_trans(JavaThread *thread);
1139
1140 // Same as check_special_condition_for_native_trans but finishes the
1141 // transition into thread_in_Java mode so that it can potentially
1142 // block.
1143 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1144
1145 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1146 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1147 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1148 // Warning: is_ext_suspend_completed() may temporarily drop the
1149 // SR_lock to allow the thread to reach a stable thread state if
1150 // it is currently in a transient thread state.
1151 return is_ext_suspend_completed(false /* !called_by_wait */,
1152 SuspendRetryDelay, bits);
1153 }
1154
1155 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1156 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1157 // passed as the count and delay parameters. Experiments with specific
1158 // calls to wait_for_ext_suspend_completion() can be done by passing
1159 // other values in the code. Experiments with all calls can be done
1160 // via the appropriate -XX options.
1161 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1162
1163 inline void set_external_suspend();
1164 inline void clear_external_suspend();
1165
1166 inline void set_deopt_suspend();
1167 inline void clear_deopt_suspend();
1168 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1169
1170 bool is_external_suspend() const {
1171 return (_suspend_flags & _external_suspend) != 0;
1172 }
1173 // Whenever a thread transitions from native to vm/java it must suspend
1174 // if external|deopt suspend is present.
1175 bool is_suspend_after_native() const {
1176 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1177 }
1178
1179 // external suspend request is completed
1180 bool is_ext_suspended() const {
1181 return (_suspend_flags & _ext_suspended) != 0;
1182 }
1183
1184 bool is_external_suspend_with_lock() const {
1185 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1186 return is_external_suspend();
1187 }
1188
1189 // Special method to handle a pending external suspend request
1190 // when a suspend equivalent condition lifts.
1191 bool handle_special_suspend_equivalent_condition() {
1192 assert(is_suspend_equivalent(),
1193 "should only be called in a suspend equivalence condition");
1194 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1195 bool ret = is_external_suspend();
1196 if (!ret) {
1197 // not about to self-suspend so clear suspend equivalence
1198 clear_suspend_equivalent();
1199 }
1200 // implied else:
1201 // We have a pending external suspend request so we leave the
1202 // suspend_equivalent flag set until java_suspend_self() sets
1203 // the ext_suspended flag and clears the suspend_equivalent
1204 // flag. This insures that wait_for_ext_suspend_completion()
1205 // will return consistent values.
1206 return ret;
1207 }
1208
1209 // utility methods to see if we are doing some kind of suspension
1210 bool is_being_ext_suspended() const {
1211 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1212 return is_ext_suspended() || is_external_suspend();
1213 }
1214
1215 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1216
1217 void set_suspend_equivalent() { _suspend_equivalent = true; }
1218 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1219
1220 // Thread.stop support
1221 void send_thread_stop(oop throwable);
1222 AsyncRequests clear_special_runtime_exit_condition() {
1223 AsyncRequests x = _special_runtime_exit_condition;
1224 _special_runtime_exit_condition = _no_async_condition;
1225 return x;
1226 }
1227
1228 // Are any async conditions present?
1229 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1230
1231 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1232
1233 // these next two are also used for self-suspension and async exception support
1234 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1235
1236 // Return true if JavaThread has an asynchronous condition or
1237 // if external suspension is requested.
1238 bool has_special_runtime_exit_condition() {
1239 // We call is_external_suspend() last since external suspend should
1240 // be less common. Because we don't use is_external_suspend_with_lock
1241 // it is possible that we won't see an asynchronous external suspend
1242 // request that has just gotten started, i.e., SR_lock grabbed but
1243 // _external_suspend field change either not made yet or not visible
1244 // yet. However, this is okay because the request is asynchronous and
1245 // we will see the new flag value the next time through. It's also
1246 // possible that the external suspend request is dropped after
1247 // we have checked is_external_suspend(), we will recheck its value
1248 // under SR_lock in java_suspend_self().
1249 return (_special_runtime_exit_condition != _no_async_condition) ||
1250 is_external_suspend() || is_deopt_suspend();
1251 }
1252
1253 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1254
1255 inline void set_pending_async_exception(oop e);
1256
1257 // Fast-locking support
1258 bool is_lock_owned(address adr) const;
1259
1260 // Accessors for vframe array top
1261 // The linked list of vframe arrays are sorted on sp. This means when we
1262 // unpack the head must contain the vframe array to unpack.
1263 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1264 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1265
1266 // Side structure for deferring update of java frame locals until deopt occurs
1267 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1268 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1269
1270 // These only really exist to make debugging deopt problems simpler
1271
1272 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1273 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1274
1275 // The special resourceMark used during deoptimization
1276
1277 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1278 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1279
1280 intptr_t* must_deopt_id() { return _must_deopt_id; }
1281 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1282 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1283
1284 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1285 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1286
1287 Method* callee_target() const { return _callee_target; }
1288 void set_callee_target (Method* x) { _callee_target = x; }
1289
1290 // Oop results of vm runtime calls
1291 oop vm_result() const { return _vm_result; }
1292 void set_vm_result (oop x) { _vm_result = x; }
1293
1294 Metadata* vm_result_2() const { return _vm_result_2; }
1295 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1296
1297 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1298 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1299
1300 #if INCLUDE_JVMCI
1301 int pending_deoptimization() const { return _pending_deoptimization; }
1302 oop pending_failed_speculation() const { return _pending_failed_speculation; }
1303 bool has_pending_monitorenter() const { return _pending_monitorenter; }
1304 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
1305 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
1306 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; }
1307 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
1308 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
1309 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
1310 #endif // INCLUDE_JVMCI
1311
1312 // Exception handling for compiled methods
1313 oop exception_oop() const { return _exception_oop; }
1314 address exception_pc() const { return _exception_pc; }
1315 address exception_handler_pc() const { return _exception_handler_pc; }
1316 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1317
1318 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1319 void set_exception_pc(address a) { _exception_pc = a; }
1320 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1321 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1322
1323 void clear_exception_oop_and_pc() {
1324 set_exception_oop(NULL);
1325 set_exception_pc(NULL);
1326 }
1327
1328 // Stack overflow support
1329 inline size_t stack_available(address cur_sp);
1330 address stack_yellow_zone_base() {
1331 return (address)(stack_base() -
1332 (stack_size() -
1333 (stack_red_zone_size() + stack_yellow_zone_size())));
1334 }
1335 size_t stack_yellow_zone_size() {
1336 return StackYellowPages * os::vm_page_size();
1337 }
1338 address stack_red_zone_base() {
1339 return (address)(stack_base() - (stack_size() - stack_red_zone_size()));
1340 }
1341 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); }
1342 bool in_stack_yellow_zone(address a) {
1343 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base());
1344 }
1345 bool in_stack_red_zone(address a) {
1346 return (a <= stack_red_zone_base()) &&
1347 (a >= (address)((intptr_t)stack_base() - stack_size()));
1348 }
1349
1350 void create_stack_guard_pages();
1351 void remove_stack_guard_pages();
1352
1353 void enable_stack_yellow_zone();
1354 void disable_stack_yellow_zone();
1355 void enable_stack_red_zone();
1356 void disable_stack_red_zone();
1357
1358 inline bool stack_guard_zone_unused();
1359 inline bool stack_yellow_zone_disabled();
1360 inline bool stack_yellow_zone_enabled();
1361
1362 // Attempt to reguard the stack after a stack overflow may have occurred.
1363 // Returns true if (a) guard pages are not needed on this thread, (b) the
1364 // pages are already guarded, or (c) the pages were successfully reguarded.
1365 // Returns false if there is not enough stack space to reguard the pages, in
1366 // which case the caller should unwind a frame and try again. The argument
1367 // should be the caller's (approximate) sp.
1368 bool reguard_stack(address cur_sp);
1369 // Similar to above but see if current stackpoint is out of the guard area
1370 // and reguard if possible.
1371 bool reguard_stack(void);
1372
1373 address stack_overflow_limit() { return _stack_overflow_limit; }
1374 void set_stack_overflow_limit() {
1375 _stack_overflow_limit = _stack_base - _stack_size +
1376 ((StackShadowPages +
1377 StackYellowPages +
1378 StackRedPages) * os::vm_page_size());
1379 }
1380
1381 // Misc. accessors/mutators
1382 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1383 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1384 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1385
1386 #ifndef PRODUCT
1387 void record_jump(address target, address instr, const char* file, int line);
1388 #endif // PRODUCT
1389
1390 // For assembly stub generation
1391 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1392 #ifndef PRODUCT
1393 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1394 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1395 #endif // PRODUCT
1396 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1397 static ByteSize last_Java_sp_offset() {
1398 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1399 }
1400 static ByteSize last_Java_pc_offset() {
1401 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1402 }
1403 static ByteSize frame_anchor_offset() {
1404 return byte_offset_of(JavaThread, _anchor);
1405 }
1406 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1407 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1408 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1409 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1410 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1411 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1412 #if INCLUDE_JVMCI
1413 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
1414 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
1415 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); }
1416 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
1417 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
1418 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
1419 #endif // INCLUDE_JVMCI
1420 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1421 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1422 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1423 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1424 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1425 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1426 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1427
1428 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1429 static ByteSize should_post_on_exceptions_flag_offset() {
1430 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1431 }
1432
1433 #if INCLUDE_ALL_GCS
1434 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1435 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1436 #endif // INCLUDE_ALL_GCS
1437
1438 // Returns the jni environment for this thread
1439 JNIEnv* jni_environment() { return &_jni_environment; }
1440
1441 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1442 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1443 // Only return NULL if thread is off the thread list; starting to
1444 // exit should not return NULL.
1445 if (thread_from_jni_env->is_terminated()) {
1446 thread_from_jni_env->block_if_vm_exited();
1447 return NULL;
1448 } else {
1449 return thread_from_jni_env;
1450 }
1451 }
1452
1453 // JNI critical regions. These can nest.
1454 bool in_critical() { return _jni_active_critical > 0; }
1455 bool in_last_critical() { return _jni_active_critical == 1; }
1456 void enter_critical() {
1457 assert(Thread::current() == this ||
1458 (Thread::current()->is_VM_thread() &&
1459 SafepointSynchronize::is_synchronizing()),
1460 "this must be current thread or synchronizing");
1461 _jni_active_critical++;
1462 }
1463 void exit_critical() {
1464 assert(Thread::current() == this, "this must be current thread");
1465 _jni_active_critical--;
1466 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1467 }
1468
1469 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1470 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1471 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1472 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1473 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1474
1475 // For deadlock detection
1476 int depth_first_number() { return _depth_first_number; }
1477 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1478
1479 private:
1480 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1481
1482 public:
1483 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1484 void add_monitor_chunk(MonitorChunk* chunk);
1485 void remove_monitor_chunk(MonitorChunk* chunk);
1486 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1487 void inc_in_deopt_handler() { _in_deopt_handler++; }
1488 void dec_in_deopt_handler() {
1489 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1490 if (_in_deopt_handler > 0) { // robustness
1491 _in_deopt_handler--;
1492 }
1493 }
1494
1495 private:
1496 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1497
1498 public:
1499
1500 // Frame iteration; calls the function f for all frames on the stack
1501 void frames_do(void f(frame*, const RegisterMap*));
1502
1503 // Memory operations
1504 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1505
1506 // Sweeper operations
1507 void nmethods_do(CodeBlobClosure* cf);
1508
1509 // RedefineClasses Support
1510 void metadata_do(void f(Metadata*));
1511
1512 // Misc. operations
1513 char* name() const { return (char*)get_thread_name(); }
1514 void print_on(outputStream* st) const;
1515 void print_value();
1516 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1517 void print_thread_state() const PRODUCT_RETURN;
1518 void print_on_error(outputStream* st, char* buf, int buflen) const;
1519 void verify();
1520 const char* get_thread_name() const;
1521 private:
1522 // factor out low-level mechanics for use in both normal and error cases
1523 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1524 public:
1525 const char* get_threadgroup_name() const;
1526 const char* get_parent_name() const;
1527
1528 // Accessing frames
1529 frame last_frame() {
1530 _anchor.make_walkable(this);
1531 return pd_last_frame();
1532 }
1533 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1534
1535 // Returns method at 'depth' java or native frames down the stack
1536 // Used for security checks
1537 Klass* security_get_caller_class(int depth);
1538
1539 // Print stack trace in external format
1540 void print_stack_on(outputStream* st);
1541 void print_stack() { print_stack_on(tty); }
1542
1543 // Print stack traces in various internal formats
1544 void trace_stack() PRODUCT_RETURN;
1545 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1546 void trace_frames() PRODUCT_RETURN;
1547 void trace_oops() PRODUCT_RETURN;
1548
1549 // Print an annotated view of the stack frames
1550 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1551 void validate_frame_layout() {
1552 print_frame_layout(0, true);
1553 }
1554
1555 // Returns the number of stack frames on the stack
1556 int depth() const;
1557
1558 // Function for testing deoptimization
1559 void deoptimize();
1560 void make_zombies();
1561
1562 void deoptimized_wrt_marked_nmethods();
1563
1564 // Profiling operation (see fprofile.cpp)
1565 public:
1566 bool profile_last_Java_frame(frame* fr);
1567
1568 private:
1569 ThreadProfiler* _thread_profiler;
1570 private:
1571 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1572 friend class FlatProfilerTask; // uses get_thread_profiler.
1573 friend class ThreadProfilerMark; // uses get_thread_profiler.
1574 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1575 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1576 ThreadProfiler* result = _thread_profiler;
1577 _thread_profiler = tp;
1578 return result;
1579 }
1580
1581 public:
1582 // Returns the running thread as a JavaThread
1583 static inline JavaThread* current();
1584
1585 // Returns the active Java thread. Do not use this if you know you are calling
1586 // from a JavaThread, as it's slower than JavaThread::current. If called from
1587 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1588 // operation. You may not want that either.
1589 static JavaThread* active();
1590
1591 inline CompilerThread* as_CompilerThread();
1592
1593 public:
1594 virtual void run();
1595 void thread_main_inner();
1596
1597 private:
1598 // PRIVILEGED STACK
1599 PrivilegedElement* _privileged_stack_top;
1600 GrowableArray<oop>* _array_for_gc;
1601 public:
1602
1603 // Returns the privileged_stack information.
1604 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1605 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1606 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1607
1608 public:
1609 // Thread local information maintained by JVMTI.
1610 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1611 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1612 // getter is used to get this JavaThread's JvmtiThreadState if it has
1613 // one which means NULL can be returned. JvmtiThreadState::state_for()
1614 // is used to get the specified JavaThread's JvmtiThreadState if it has
1615 // one or it allocates a new JvmtiThreadState for the JavaThread and
1616 // returns it. JvmtiThreadState::state_for() will return NULL only if
1617 // the specified JavaThread is exiting.
1618 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1619 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1620 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1621 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1622
1623 // JVMTI PopFrame support
1624 // Setting and clearing popframe_condition
1625 // All of these enumerated values are bits. popframe_pending
1626 // indicates that a PopFrame() has been requested and not yet been
1627 // completed. popframe_processing indicates that that PopFrame() is in
1628 // the process of being completed. popframe_force_deopt_reexecution_bit
1629 // indicates that special handling is required when returning to a
1630 // deoptimized caller.
1631 enum PopCondition {
1632 popframe_inactive = 0x00,
1633 popframe_pending_bit = 0x01,
1634 popframe_processing_bit = 0x02,
1635 popframe_force_deopt_reexecution_bit = 0x04
1636 };
1637 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1638 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1639 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1640 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1641 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1642 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1643 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1644 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1645 #ifdef CC_INTERP
1646 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1647 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1648 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1649 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1650 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1651 #endif
1652
1653 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1654 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1655 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1656
1657 private:
1658 // Saved incoming arguments to popped frame.
1659 // Used only when popped interpreted frame returns to deoptimized frame.
1660 void* _popframe_preserved_args;
1661 int _popframe_preserved_args_size;
1662
1663 public:
1664 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1665 void* popframe_preserved_args();
1666 ByteSize popframe_preserved_args_size();
1667 WordSize popframe_preserved_args_size_in_words();
1668 void popframe_free_preserved_args();
1669
1670
1671 private:
1672 JvmtiThreadState *_jvmti_thread_state;
1673 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1674
1675 // Used by the interpreter in fullspeed mode for frame pop, method
1676 // entry, method exit and single stepping support. This field is
1677 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1678 // It can be set to zero asynchronously (i.e., without a VM operation
1679 // or a lock) so we have to be very careful.
1680 int _interp_only_mode;
1681
1682 public:
1683 // used by the interpreter for fullspeed debugging support (see above)
1684 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1685 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1686 int get_interp_only_mode() { return _interp_only_mode; }
1687 void increment_interp_only_mode() { ++_interp_only_mode; }
1688 void decrement_interp_only_mode() { --_interp_only_mode; }
1689
1690 // support for cached flag that indicates whether exceptions need to be posted for this thread
1691 // if this is false, we can avoid deoptimizing when events are thrown
1692 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1693 private:
1694 int _should_post_on_exceptions_flag;
1695
1696 public:
1697 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1698 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1699
1700 private:
1701 ThreadStatistics *_thread_stat;
1702
1703 public:
1704 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1705
1706 // Return a blocker object for which this thread is blocked parking.
1707 oop current_park_blocker();
1708
1709 private:
1710 static size_t _stack_size_at_create;
1711
1712 public:
1713 static inline size_t stack_size_at_create(void) {
1714 return _stack_size_at_create;
1715 }
1716 static inline void set_stack_size_at_create(size_t value) {
1717 _stack_size_at_create = value;
1718 }
1719
1720 #if INCLUDE_ALL_GCS
1721 // SATB marking queue support
1722 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1723 static SATBMarkQueueSet& satb_mark_queue_set() {
1724 return _satb_mark_queue_set;
1725 }
1726
1727 // Dirty card queue support
1728 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1729 static DirtyCardQueueSet& dirty_card_queue_set() {
1730 return _dirty_card_queue_set;
1731 }
1732 #endif // INCLUDE_ALL_GCS
1733
1734 // This method initializes the SATB and dirty card queues before a
1735 // JavaThread is added to the Java thread list. Right now, we don't
1736 // have to do anything to the dirty card queue (it should have been
1737 // activated when the thread was created), but we have to activate
1738 // the SATB queue if the thread is created while a marking cycle is
1739 // in progress. The activation / de-activation of the SATB queues at
1740 // the beginning / end of a marking cycle is done during safepoints
1741 // so we have to make sure this method is called outside one to be
1742 // able to safely read the active field of the SATB queue set. Right
1743 // now, it is called just before the thread is added to the Java
1744 // thread list in the Threads::add() method. That method is holding
1745 // the Threads_lock which ensures we are outside a safepoint. We
1746 // cannot do the obvious and set the active field of the SATB queue
1747 // when the thread is created given that, in some cases, safepoints
1748 // might happen between the JavaThread constructor being called and the
1749 // thread being added to the Java thread list (an example of this is
1750 // when the structure for the DestroyJavaVM thread is created).
1751 #if INCLUDE_ALL_GCS
1752 void initialize_queues();
1753 #else // INCLUDE_ALL_GCS
1754 void initialize_queues() { }
1755 #endif // INCLUDE_ALL_GCS
1756
1757 // Machine dependent stuff
1758 #ifdef TARGET_OS_ARCH_linux_x86
1759 # include "thread_linux_x86.hpp"
1760 #endif
1761 #ifdef TARGET_OS_ARCH_linux_sparc
1762 # include "thread_linux_sparc.hpp"
1763 #endif
1764 #ifdef TARGET_OS_ARCH_linux_zero
1765 # include "thread_linux_zero.hpp"
1766 #endif
1767 #ifdef TARGET_OS_ARCH_solaris_x86
1768 # include "thread_solaris_x86.hpp"
1769 #endif
1770 #ifdef TARGET_OS_ARCH_solaris_sparc
1771 # include "thread_solaris_sparc.hpp"
1772 #endif
1773 #ifdef TARGET_OS_ARCH_windows_x86
1774 # include "thread_windows_x86.hpp"
1775 #endif
1776 #ifdef TARGET_OS_ARCH_linux_arm
1777 # include "thread_linux_arm.hpp"
1778 #endif
1779 #ifdef TARGET_OS_ARCH_linux_ppc
1780 # include "thread_linux_ppc.hpp"
1781 #endif
1782 #ifdef TARGET_OS_ARCH_linux_aarch64
1783 # include "thread_linux_aarch64.hpp"
1784 #endif
1785 #ifdef TARGET_OS_ARCH_aix_ppc
1786 # include "thread_aix_ppc.hpp"
1787 #endif
1788 #ifdef TARGET_OS_ARCH_bsd_x86
1789 # include "thread_bsd_x86.hpp"
1790 #endif
1791 #ifdef TARGET_OS_ARCH_bsd_zero
1792 # include "thread_bsd_zero.hpp"
1793 #endif
1794
1795
1796 public:
1797 void set_blocked_on_compilation(bool value) {
1798 _blocked_on_compilation = value;
1799 }
1800
1801 bool blocked_on_compilation() {
1802 return _blocked_on_compilation;
1803 }
1804 protected:
1805 bool _blocked_on_compilation;
1806
1807
1808 // JSR166 per-thread parker
1809 private:
1810 Parker* _parker;
1811 public:
1812 Parker* parker() { return _parker; }
1813
1814 // Biased locking support
1815 private:
1816 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1817 public:
1818 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1819 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1820
1821 // clearing/querying jni attach status
1822 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1823 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1824 inline void set_done_attaching_via_jni();
1825 private:
1826 // This field is used to determine if a thread has claimed
1827 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1828 // otherwise its value is the par_id that has been claimed.
1829 uint _claimed_par_id;
1830 public:
1831 uint get_claimed_par_id() { return _claimed_par_id; }
1832 void set_claimed_par_id(uint id) { _claimed_par_id = id; }
1833 };
1834
1835 // Inline implementation of JavaThread::current
1836 inline JavaThread* JavaThread::current() {
1837 Thread* thread = Thread::current();
1838 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1839 return (JavaThread*)thread;
1840 }
1841
1842 inline CompilerThread* JavaThread::as_CompilerThread() {
1843 assert(is_Compiler_thread(), "just checking");
1844 return (CompilerThread*)this;
1845 }
1846
1847 // Dedicated thread to sweep the code cache
1848 class CodeCacheSweeperThread : public JavaThread {
1849 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1850 public:
1851 CodeCacheSweeperThread();
1852 // Track the nmethod currently being scanned by the sweeper
1853 void set_scanned_nmethod(nmethod* nm) {
1854 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1855 _scanned_nmethod = nm;
1856 }
1857
1858 // Hide sweeper thread from external view.
1859 bool is_hidden_from_external_view() const { return true; }
1860
1861 bool is_Code_cache_sweeper_thread() const { return true; }
1862 // GC support
1863 // Apply "f->do_oop" to all root oops in "this".
1864 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1865 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1866 };
1867
1868 // A thread used for Compilation.
1869 class CompilerThread : public JavaThread {
1870 friend class VMStructs;
1871 private:
1872 CompilerCounters* _counters;
1873
1874 ciEnv* _env;
1875 CompileLog* _log;
1876 CompileTask* _task;
1877 CompileQueue* _queue;
1878 BufferBlob* _buffer_blob;
1879
1880 AbstractCompiler* _compiler;
1881
1882 public:
1883
1884 static CompilerThread* current();
1885
1886 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1887
1888 bool is_Compiler_thread() const { return true; }
1889
1890 virtual bool can_call_java() const;
1891
1892 // Hide native compiler threads from external view.
1893 bool is_hidden_from_external_view() const { return !can_call_java(); }
1894
1895 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1896 AbstractCompiler* compiler() const { return _compiler; }
1897
1898 CompileQueue* queue() const { return _queue; }
1899 CompilerCounters* counters() const { return _counters; }
1900
1901 // Get/set the thread's compilation environment.
1902 ciEnv* env() { return _env; }
1903 void set_env(ciEnv* env) { _env = env; }
1904
1905 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1906 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
1907
1908 // Get/set the thread's logging information
1909 CompileLog* log() { return _log; }
1910 void init_log(CompileLog* log) {
1911 // Set once, for good.
1912 assert(_log == NULL, "set only once");
1913 _log = log;
1914 }
1915
1916 #ifndef PRODUCT
1917 private:
1918 IdealGraphPrinter *_ideal_graph_printer;
1919 public:
1920 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1921 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1922 #endif
1923
1924 // Get/set the thread's current task
1925 CompileTask* task() { return _task; }
1926 void set_task(CompileTask* task) { _task = task; }
1927 };
1928
1929 inline CompilerThread* CompilerThread::current() {
1930 return JavaThread::current()->as_CompilerThread();
1931 }
1932
1933 // The active thread queue. It also keeps track of the current used
1934 // thread priorities.
1935 class Threads: AllStatic {
1936 friend class VMStructs;
1937 private:
1938 static JavaThread* _thread_list;
1939 static int _number_of_threads;
1940 static int _number_of_non_daemon_threads;
1941 static int _return_code;
1942 static int _thread_claim_parity;
1943 #ifdef ASSERT
1944 static bool _vm_complete;
1945 #endif
1946
1947 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
1948 static void initialize_jsr292_core_classes(TRAPS);
1949 public:
1950 // Thread management
1951 // force_daemon is a concession to JNI, where we may need to add a
1952 // thread to the thread list before allocating its thread object
1953 static void add(JavaThread* p, bool force_daemon = false);
1954 static void remove(JavaThread* p);
1955 static bool includes(JavaThread* p);
1956 static JavaThread* first() { return _thread_list; }
1957 static void threads_do(ThreadClosure* tc);
1958
1959 // Initializes the vm and creates the vm thread
1960 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1961 static void convert_vm_init_libraries_to_agents();
1962 static void create_vm_init_libraries();
1963 static void create_vm_init_agents();
1964 static void shutdown_vm_agents();
1965 static bool destroy_vm();
1966 // Supported VM versions via JNI
1967 // Includes JNI_VERSION_1_1
1968 static jboolean is_supported_jni_version_including_1_1(jint version);
1969 // Does not include JNI_VERSION_1_1
1970 static jboolean is_supported_jni_version(jint version);
1971
1972 // The "thread claim parity" provides a way for threads to be claimed
1973 // by parallel worker tasks.
1974 //
1975 // Each thread contains a a "parity" field. A task will claim the
1976 // thread only if its parity field is the same as the global parity,
1977 // which is updated by calling change_thread_claim_parity().
1978 //
1979 // For this to work change_thread_claim_parity() needs to be called
1980 // exactly once in sequential code before starting parallel tasks
1981 // that should claim threads.
1982 //
1983 // New threads get their parity set to 0 and change_thread_claim_parity()
1984 // never set the global parity to 0.
1985 static int thread_claim_parity() { return _thread_claim_parity; }
1986 static void change_thread_claim_parity();
1987 static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
1988
1989 // Apply "f->do_oop" to all root oops in all threads.
1990 // This version may only be called by sequential code.
1991 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1992 // This version may be called by sequential or parallel code.
1993 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1994 // This creates a list of GCTasks, one per thread.
1995 static void create_thread_roots_tasks(GCTaskQueue* q);
1996 // This creates a list of GCTasks, one per thread, for marking objects.
1997 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1998
1999 // Apply "f->do_oop" to roots in all threads that
2000 // are part of compiled frames
2001 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
2002
2003 static void convert_hcode_pointers();
2004 static void restore_hcode_pointers();
2005
2006 // Sweeper
2007 static void nmethods_do(CodeBlobClosure* cf);
2008
2009 // RedefineClasses support
2010 static void metadata_do(void f(Metadata*));
2011 static void metadata_handles_do(void f(Metadata*));
2012
2013 #ifdef ASSERT
2014 static bool is_vm_complete() { return _vm_complete; }
2015 #endif
2016
2017 // Verification
2018 static void verify();
2019 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
2020 static void print(bool print_stacks, bool internal_format) {
2021 // this function is only used by debug.cpp
2022 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
2023 }
2024 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2025
2026 // Get Java threads that are waiting to enter a monitor. If doLock
2027 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2028 // VM needs to be at a safepoint.
2029 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2030 address monitor, bool doLock);
2031
2032 // Get owning Java thread from the monitor's owner field. If doLock
2033 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2034 // VM needs to be at a safepoint.
2035 static JavaThread *owning_thread_from_monitor_owner(address owner,
2036 bool doLock);
2037
2038 // Number of threads on the active threads list
2039 static int number_of_threads() { return _number_of_threads; }
2040 // Number of non-daemon threads on the active threads list
2041 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2042
2043 // Deoptimizes all frames tied to marked nmethods
2044 static void deoptimized_wrt_marked_nmethods();
2045
2046 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2047
2048 };
2049
2050
2051 // Thread iterator
2052 class ThreadClosure: public StackObj {
2053 public:
2054 virtual void do_thread(Thread* thread) = 0;
2055 };
2056
2057 class SignalHandlerMark: public StackObj {
2058 private:
2059 Thread* _thread;
2060 public:
2061 SignalHandlerMark(Thread* t) {
2062 _thread = t;
2063 if (_thread) _thread->enter_signal_handler();
2064 }
2065 ~SignalHandlerMark() {
2066 if (_thread) _thread->leave_signal_handler();
2067 _thread = NULL;
2068 }
2069 };
2070
2071
2072 #endif // SHARE_VM_RUNTIME_THREAD_HPP