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
270 TRACE_DATA _trace_data; // Thread-local data for tracing
271
272 ThreadExt _ext;
273
274 int _vm_operation_started_count; // VM_Operation support
275 int _vm_operation_completed_count; // VM_Operation support
276
277 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
278 // is waiting to lock
279 bool _current_pending_monitor_is_from_java; // locking is from Java code
280
281 // ObjectMonitor on which this thread called Object.wait()
282 ObjectMonitor* _current_waiting_monitor;
283
284 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
285 public:
286 ObjectMonitor* omFreeList;
287 int omFreeCount; // length of omFreeList
288 int omFreeProvision; // reload chunk size
289 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
290 int omInUseCount; // length of omInUseList
291
292 #ifdef ASSERT
293 private:
294 bool _visited_for_critical_count;
295
296 public:
297 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
298 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
299 #endif
300
301 public:
302 enum {
303 is_definitely_current_thread = true
304 };
305
306 // Constructor
307 Thread();
308 virtual ~Thread();
309
310 // initializtion
311 void initialize_thread_local_storage();
312
313 // thread entry point
314 virtual void run();
315
316 // Testers
317 virtual bool is_VM_thread() const { return false; }
318 virtual bool is_Java_thread() const { return false; }
319 virtual bool is_Compiler_thread() const { return false; }
320 virtual bool is_Code_cache_sweeper_thread() const { return false; }
321 virtual bool is_hidden_from_external_view() const { return false; }
322 virtual bool is_jvmti_agent_thread() const { return false; }
323 // True iff the thread can perform GC operations at a safepoint.
324 // Generally will be true only of VM thread and parallel GC WorkGang
325 // threads.
326 virtual bool is_GC_task_thread() const { return false; }
327 virtual bool is_Watcher_thread() const { return false; }
328 virtual bool is_ConcurrentGC_thread() const { return false; }
329 virtual bool is_Named_thread() const { return false; }
330 virtual bool is_Worker_thread() const { return false; }
331
332 // Can this thread make Java upcalls
333 virtual bool can_call_java() const { return false; }
334
335 // Casts
336 virtual WorkerThread* as_Worker_thread() const { return NULL; }
337
338 virtual char* name() const { return (char*)"Unknown thread"; }
339
340 // Returns the current thread
341 static inline Thread* current();
342 // ... without having to include thread.inline.hpp.
343 static Thread* current_noinline();
344
345 // Common thread operations
346 static void set_priority(Thread* thread, ThreadPriority priority);
347 static ThreadPriority get_priority(const Thread* const thread);
348 static void start(Thread* thread);
349 static void interrupt(Thread* thr);
350 static bool is_interrupted(Thread* thr, bool clear_interrupted);
351
352 void set_native_thread_name(const char *name) {
353 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
354 os::set_native_thread_name(name);
355 }
356
357 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
358 Monitor* SR_lock() const { return _SR_lock; }
359
360 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
361
362 inline void set_suspend_flag(SuspendFlags f);
363 inline void clear_suspend_flag(SuspendFlags f);
364
365 inline void set_has_async_exception();
366 inline void clear_has_async_exception();
367
368 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
369
370 inline void set_critical_native_unlock();
371 inline void clear_critical_native_unlock();
372
373 // Support for Unhandled Oop detection
374 #ifdef CHECK_UNHANDLED_OOPS
375 private:
376 UnhandledOops* _unhandled_oops;
377 public:
378 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
379 // Mark oop safe for gc. It may be stack allocated but won't move.
380 void allow_unhandled_oop(oop *op) {
381 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
382 }
383 // Clear oops at safepoint so crashes point to unhandled oop violator
384 void clear_unhandled_oops() {
385 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
386 }
387 #endif // CHECK_UNHANDLED_OOPS
388
389 #ifndef PRODUCT
390 bool skip_gcalot() { return _skip_gcalot; }
391 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
392 #endif
393
394 public:
395 // Installs a pending exception to be inserted later
396 static void send_async_exception(oop thread_oop, oop java_throwable);
397
398 // Resource area
399 ResourceArea* resource_area() const { return _resource_area; }
400 void set_resource_area(ResourceArea* area) { _resource_area = area; }
401
402 OSThread* osthread() const { return _osthread; }
403 void set_osthread(OSThread* thread) { _osthread = thread; }
404
405 // JNI handle support
406 JNIHandleBlock* active_handles() const { return _active_handles; }
407 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
408 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
409 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
410
411 // Internal handle support
412 HandleArea* handle_area() const { return _handle_area; }
413 void set_handle_area(HandleArea* area) { _handle_area = area; }
414
415 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
416 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
417
418 // Thread-Local Allocation Buffer (TLAB) support
419 ThreadLocalAllocBuffer& tlab() { return _tlab; }
420 void initialize_tlab() {
421 if (UseTLAB) {
422 tlab().initialize();
423 }
424 }
425
426 jlong allocated_bytes() { return _allocated_bytes; }
427 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
428 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
429 inline jlong cooked_allocated_bytes();
430
431 TRACE_DATA* trace_data() { return &_trace_data; }
432
433 const ThreadExt& ext() const { return _ext; }
434 ThreadExt& ext() { return _ext; }
435
436 // VM operation support
437 int vm_operation_ticket() { return ++_vm_operation_started_count; }
438 int vm_operation_completed_count() { return _vm_operation_completed_count; }
439 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
440
441 // For tracking the heavyweight monitor the thread is pending on.
442 ObjectMonitor* current_pending_monitor() {
443 return _current_pending_monitor;
444 }
445 void set_current_pending_monitor(ObjectMonitor* monitor) {
446 _current_pending_monitor = monitor;
447 }
448 void set_current_pending_monitor_is_from_java(bool from_java) {
449 _current_pending_monitor_is_from_java = from_java;
450 }
451 bool current_pending_monitor_is_from_java() {
452 return _current_pending_monitor_is_from_java;
453 }
454
455 // For tracking the ObjectMonitor on which this thread called Object.wait()
456 ObjectMonitor* current_waiting_monitor() {
457 return _current_waiting_monitor;
458 }
459 void set_current_waiting_monitor(ObjectMonitor* monitor) {
460 _current_waiting_monitor = monitor;
461 }
462
463 // GC support
464 // Apply "f->do_oop" to all root oops in "this".
465 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
466 // Used by JavaThread::oops_do.
467 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
468 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
469
470 // Handles the parallel case for the method below.
471 private:
472 bool claim_oops_do_par_case(int collection_parity);
473 public:
474 // Requires that "collection_parity" is that of the current roots
475 // iteration. If "is_par" is false, sets the parity of "this" to
476 // "collection_parity", and returns "true". If "is_par" is true,
477 // uses an atomic instruction to set the current threads parity to
478 // "collection_parity", if it is not already. Returns "true" iff the
479 // calling thread does the update, this indicates that the calling thread
480 // has claimed the thread's stack as a root groop in the current
481 // collection.
482 bool claim_oops_do(bool is_par, int collection_parity) {
483 if (!is_par) {
484 _oops_do_parity = collection_parity;
485 return true;
486 } else {
487 return claim_oops_do_par_case(collection_parity);
488 }
489 }
490
491 // Sweeper support
492 void nmethods_do(CodeBlobClosure* cf);
493
494 // jvmtiRedefineClasses support
495 void metadata_handles_do(void f(Metadata*));
496
497 // Used by fast lock support
498 virtual bool is_lock_owned(address adr) const;
499
500 // Check if address is in the stack of the thread (not just for locks).
501 // Warning: the method can only be used on the running thread
502 bool is_in_stack(address adr) const;
503 // Check if address is in the usable part of the stack (excludes protected
504 // guard pages)
505 bool is_in_usable_stack(address adr) const;
506
507 // Sets this thread as starting thread. Returns failure if thread
508 // creation fails due to lack of memory, too many threads etc.
509 bool set_as_starting_thread();
510
511 protected:
512 // OS data associated with the thread
513 OSThread* _osthread; // Platform-specific thread information
514
515 // Thread local resource area for temporary allocation within the VM
516 ResourceArea* _resource_area;
517
518 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
519
520 // Thread local handle area for allocation of handles within the VM
521 HandleArea* _handle_area;
522 GrowableArray<Metadata*>* _metadata_handles;
523
524 // Support for stack overflow handling, get_thread, etc.
525 address _stack_base;
526 size_t _stack_size;
527 uintptr_t _self_raw_id; // used by get_thread (mutable)
528 int _lgrp_id;
529
530 public:
531 // Stack overflow support
532 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
533
534 void set_stack_base(address base) { _stack_base = base; }
535 size_t stack_size() const { return _stack_size; }
536 void set_stack_size(size_t size) { _stack_size = size; }
537 void record_stack_base_and_size();
538
539 bool on_local_stack(address adr) const {
540 // QQQ this has knowledge of direction, ought to be a stack method
541 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
542 }
543
544 uintptr_t self_raw_id() { return _self_raw_id; }
545 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
546
547 int lgrp_id() const { return _lgrp_id; }
548 void set_lgrp_id(int value) { _lgrp_id = value; }
549
550 // Printing
551 virtual void print_on(outputStream* st) const;
552 void print() const { print_on(tty); }
553 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
554
555 // Debug-only code
556 #ifdef ASSERT
557 private:
558 // Deadlock detection support for Mutex locks. List of locks own by thread.
559 Monitor* _owned_locks;
560 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
561 // thus the friendship
562 friend class Mutex;
563 friend class Monitor;
564
565 public:
566 void print_owned_locks_on(outputStream* st) const;
567 void print_owned_locks() const { print_owned_locks_on(tty); }
568 Monitor* owned_locks() const { return _owned_locks; }
569 bool owns_locks() const { return owned_locks() != NULL; }
570 bool owns_locks_but_compiled_lock() const;
571 int oops_do_parity() const { return _oops_do_parity; }
572
573 // Deadlock detection
574 bool allow_allocation() { return _allow_allocation_count == 0; }
575 ResourceMark* current_resource_mark() { return _current_resource_mark; }
576 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
577 #endif
578
579 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
580
581 private:
582 volatile int _jvmti_env_iteration_count;
583
584 public:
585 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
586 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
587 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
588
589 // Code generation
590 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
591 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
592 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
593
594 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
595 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
596
597 #define TLAB_FIELD_OFFSET(name) \
598 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
599
600 TLAB_FIELD_OFFSET(start)
601 TLAB_FIELD_OFFSET(end)
602 TLAB_FIELD_OFFSET(top)
603 TLAB_FIELD_OFFSET(pf_top)
604 TLAB_FIELD_OFFSET(size) // desired_size
605 TLAB_FIELD_OFFSET(refill_waste_limit)
606 TLAB_FIELD_OFFSET(number_of_refills)
607 TLAB_FIELD_OFFSET(fast_refill_waste)
608 TLAB_FIELD_OFFSET(slow_allocations)
609
610 #undef TLAB_FIELD_OFFSET
611
612 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
613
614 public:
615 volatile intptr_t _Stalled;
616 volatile int _TypeTag;
617 ParkEvent * _ParkEvent; // for synchronized()
618 ParkEvent * _SleepEvent; // for Thread.sleep
619 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
620 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
621 int NativeSyncRecursion; // diagnostic
622
623 volatile int _OnTrap; // Resume-at IP delta
624 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
625 jint _hashStateX; // thread-specific hashCode generator state
626 jint _hashStateY;
627 jint _hashStateZ;
628 void * _schedctl;
629
630
631 volatile jint rng[4]; // RNG for spin loop
632
633 // Low-level leaf-lock primitives used to implement synchronization
634 // and native monitor-mutex infrastructure.
635 // Not for general synchronization use.
636 static void SpinAcquire(volatile int * Lock, const char * Name);
637 static void SpinRelease(volatile int * Lock);
638 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
639 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
640 static void muxRelease(volatile intptr_t * Lock);
641 };
642
643 // Inline implementation of Thread::current()
644 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
645 // startup.
646 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
647 // period. This is inlined in thread_<os_family>.inline.hpp.
648
649 inline Thread* Thread::current() {
650 #ifdef ASSERT
651 // This function is very high traffic. Define PARANOID to enable expensive
652 // asserts.
653 #ifdef PARANOID
654 // Signal handler should call ThreadLocalStorage::get_thread_slow()
655 Thread* t = ThreadLocalStorage::get_thread_slow();
656 assert(t != NULL && !t->is_inside_signal_handler(),
657 "Don't use Thread::current() inside signal handler");
658 #endif
659 #endif
660 Thread* thread = ThreadLocalStorage::thread();
661 assert(thread != NULL, "just checking");
662 return thread;
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
677 public:
678 NamedThread();
679 ~NamedThread();
680 // May only be called once per thread.
681 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
682 void initialize_named_thread();
683 virtual bool is_Named_thread() const { return true; }
684 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
685 JavaThread *processed_thread() { return _processed_thread; }
686 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
687 virtual void print_on(outputStream* st) const;
688 };
689
690 // Worker threads are named and have an id of an assigned work.
691 class WorkerThread: public NamedThread {
692 private:
693 uint _id;
694 public:
695 WorkerThread() : _id(0) { }
696 virtual bool is_Worker_thread() const { return true; }
697
698 virtual WorkerThread* as_Worker_thread() const {
699 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
700 return (WorkerThread*) this;
701 }
702
703 void set_id(uint work_id) { _id = work_id; }
704 uint id() const { return _id; }
705 };
706
707 // A single WatcherThread is used for simulating timer interrupts.
708 class WatcherThread: public Thread {
709 friend class VMStructs;
710 public:
711 virtual void run();
712
713 private:
714 static WatcherThread* _watcher_thread;
715
716 static bool _startable;
717 // volatile due to at least one lock-free read
718 volatile static bool _should_terminate;
719
720 os::WatcherThreadCrashProtection* _crash_protection;
721 public:
722 enum SomeConstants {
723 delay_interval = 10 // interrupt delay in milliseconds
724 };
725
726 // Constructor
727 WatcherThread();
728
729 // Tester
730 bool is_Watcher_thread() const { return true; }
731
732 // Printing
733 char* name() const { return (char*)"VM Periodic Task Thread"; }
734 void print_on(outputStream* st) const;
735 void unpark();
736
737 // Returns the single instance of WatcherThread
738 static WatcherThread* watcher_thread() { return _watcher_thread; }
739
740 // Create and start the single instance of WatcherThread, or stop it on shutdown
741 static void start();
742 static void stop();
743 // Only allow start once the VM is sufficiently initialized
744 // Otherwise the first task to enroll will trigger the start
745 static void make_startable();
746
747 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
748 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
749 _crash_protection = crash_protection;
750 }
751
752 bool has_crash_protection() const { return _crash_protection != NULL; }
753 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
754
755 private:
756 int sleep() const;
757 };
758
759
760 class CompilerThread;
761
762 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
763
764 class JavaThread: public Thread {
765 friend class VMStructs;
766 friend class WhiteBox;
767 private:
768 JavaThread* _next; // The next thread in the Threads list
769 oop _threadObj; // The Java level thread object
770
771 #ifdef ASSERT
772 private:
773 int _java_call_counter;
774
775 public:
776 int java_call_counter() { return _java_call_counter; }
777 void inc_java_call_counter() { _java_call_counter++; }
778 void dec_java_call_counter() {
779 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
780 _java_call_counter--;
781 }
782 private: // restore original namespace restriction
783 #endif // ifdef ASSERT
784
785 #ifndef PRODUCT
786 public:
787 enum {
788 jump_ring_buffer_size = 16
789 };
790 private: // restore original namespace restriction
791 #endif
792
793 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
794
795 ThreadFunction _entry_point;
796
797 JNIEnv _jni_environment;
798
799 // Deopt support
800 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
801
802 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
803 // transition out of native
804 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
805 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
806 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
807 // Because deoptimization is lazy we must save jvmti requests to set locals
808 // in compiled frames until we deoptimize and we have an interpreter frame.
809 // This holds the pointer to array (yeah like there might be more than one) of
810 // description of compiled vframes that have locals that need to be updated.
811 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
812
813 // Handshake value for fixing 6243940. We need a place for the i2c
814 // adapter to store the callee Method*. This value is NEVER live
815 // across a gc point so it does NOT have to be gc'd
816 // The handshake is open ended since we can't be certain that it will
817 // be NULLed. This is because we rarely ever see the race and end up
818 // in handle_wrong_method which is the backend of the handshake. See
819 // code in i2c adapters and handle_wrong_method.
820
821 Method* _callee_target;
822
823 // Used to pass back results to the interpreter or generated code running Java code.
824 oop _vm_result; // oop result is GC-preserved
825 Metadata* _vm_result_2; // non-oop result
826
827 // See ReduceInitialCardMarks: this holds the precise space interval of
828 // the most recent slow path allocation for which compiled code has
829 // elided card-marks for performance along the fast-path.
830 MemRegion _deferred_card_mark;
831
832 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
833 // allocated during deoptimization
834 // and by JNI_MonitorEnter/Exit
835
836 // Async. requests support
837 enum AsyncRequests {
838 _no_async_condition = 0,
839 _async_exception,
840 _async_unsafe_access_error
841 };
842 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
843 oop _pending_async_exception;
844
845 // Safepoint support
846 public: // Expose _thread_state for SafeFetchInt()
847 volatile JavaThreadState _thread_state;
848 private:
849 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
850 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
851
852 // JavaThread termination support
853 enum TerminatedTypes {
854 _not_terminated = 0xDEAD - 2,
855 _thread_exiting, // JavaThread::exit() has been called for this thread
856 _thread_terminated, // JavaThread is removed from thread list
857 _vm_exited // JavaThread is still executing native code, but VM is terminated
858 // only VM_Exit can set _vm_exited
859 };
860
861 // In general a JavaThread's _terminated field transitions as follows:
862 //
863 // _not_terminated => _thread_exiting => _thread_terminated
864 //
865 // _vm_exited is a special value to cover the case of a JavaThread
866 // executing native code after the VM itself is terminated.
867 volatile TerminatedTypes _terminated;
868 // suspend/resume support
869 volatile bool _suspend_equivalent; // Suspend equivalent condition
870 jint _in_deopt_handler; // count of deoptimization
871 // handlers thread is in
872 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
873 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
874 // never locked) when throwing an exception. Used by interpreter only.
875
876 // JNI attach states:
877 enum JNIAttachStates {
878 _not_attaching_via_jni = 1, // thread is not attaching via JNI
879 _attaching_via_jni, // thread is attaching via JNI
880 _attached_via_jni // thread has attached via JNI
881 };
882
883 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
884 // A native thread that is attaching via JNI starts with a value
885 // of _attaching_via_jni and transitions to _attached_via_jni.
886 volatile JNIAttachStates _jni_attach_state;
887
888 public:
889 // State of the stack guard pages for this thread.
890 enum StackGuardState {
891 stack_guard_unused, // not needed
892 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
893 stack_guard_enabled // enabled
894 };
895
896 private:
897
898 #if INCLUDE_JVMCI
899 // The _pending_* fields below are used to communicate extra information
900 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
901
902 // Communicates the DeoptReason and DeoptAction of the uncommon trap
903 int _pending_deoptimization;
904
905 // An object that JVMCI compiled code can use to further describe and
906 // uniquely identify the speculative optimization guarded by the uncommon trap
907 oop _pending_failed_speculation;
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 // These fields are mutually exclusive in terms of live ranges.
917 union {
918 // Communicates the pc at which the most recent implicit exception occurred
919 // from the signal handler to a deoptimization stub.
920 address _implicit_exception_pc;
921
922 // Communicates an alternative call target to an i2c stub from a JavaCall .
923 address _alternate_call_target;
924 } _jvmci;
925
926 // Support for high precision, thread sensitive counters in JVMCI compiled code.
927 jlong* _jvmci_counters;
928
929 public:
930 static jlong* _jvmci_old_thread_counters;
931 static void collect_counters(typeArrayOop array);
932 private:
933 #endif
934
935 StackGuardState _stack_guard_state;
936
937 // Precompute the limit of the stack as used in stack overflow checks.
938 // We load it from here to simplify the stack overflow check in assembly.
939 address _stack_overflow_limit;
940
941 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
942 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
943 // code)
944 volatile oop _exception_oop; // Exception thrown in compiled code
945 volatile address _exception_pc; // PC where exception happened
946 volatile address _exception_handler_pc; // PC for handler of exception
947 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
948
949 private:
950 // support for JNI critical regions
951 jint _jni_active_critical; // count of entries into JNI critical region
952
953 // Checked JNI: function name requires exception check
954 char* _pending_jni_exception_check_fn;
955
956 // For deadlock detection.
957 int _depth_first_number;
958
959 // JVMTI PopFrame support
960 // This is set to popframe_pending to signal that top Java frame should be popped immediately
961 int _popframe_condition;
962
963 // If reallocation of scalar replaced objects fails, we throw OOM
964 // and during exception propagation, pop the top
965 // _frames_to_pop_failed_realloc frames, the ones that reference
966 // failed reallocations.
967 int _frames_to_pop_failed_realloc;
968
969 #ifndef PRODUCT
970 int _jmp_ring_index;
971 struct {
972 // We use intptr_t instead of address so debugger doesn't try and display strings
973 intptr_t _target;
974 intptr_t _instruction;
975 const char* _file;
976 int _line;
977 } _jmp_ring[jump_ring_buffer_size];
978 #endif // PRODUCT
979
980 #if INCLUDE_ALL_GCS
981 // Support for G1 barriers
982
983 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
984 // Set of all such queues.
985 static SATBMarkQueueSet _satb_mark_queue_set;
986
987 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
988 // Set of all such queues.
989 static DirtyCardQueueSet _dirty_card_queue_set;
990
991 void flush_barrier_queues();
992 #endif // INCLUDE_ALL_GCS
993
994 friend class VMThread;
995 friend class ThreadWaitTransition;
996 friend class VM_Exit;
997
998 void initialize(); // Initialized the instance variables
999
1000 public:
1001 // Constructor
1002 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1003 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1004 ~JavaThread();
1005
1006 #ifdef ASSERT
1007 // verify this JavaThread hasn't be published in the Threads::list yet
1008 void verify_not_published();
1009 #endif
1010
1011 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1012 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1013 _jni_environment.functions = functionTable;
1014 }
1015 struct JNINativeInterface_* get_jni_functions() {
1016 return (struct JNINativeInterface_ *)_jni_environment.functions;
1017 }
1018
1019 // This function is called at thread creation to allow
1020 // platform specific thread variables to be initialized.
1021 void cache_global_variables();
1022
1023 // Executes Shutdown.shutdown()
1024 void invoke_shutdown_hooks();
1025
1026 // Cleanup on thread exit
1027 enum ExitType {
1028 normal_exit,
1029 jni_detach
1030 };
1031 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1032
1033 void cleanup_failed_attach_current_thread();
1034
1035 // Testers
1036 virtual bool is_Java_thread() const { return true; }
1037 virtual bool can_call_java() const { return true; }
1038
1039 // Thread chain operations
1040 JavaThread* next() const { return _next; }
1041 void set_next(JavaThread* p) { _next = p; }
1042
1043 // Thread oop. threadObj() can be NULL for initial JavaThread
1044 // (or for threads attached via JNI)
1045 oop threadObj() const { return _threadObj; }
1046 void set_threadObj(oop p) { _threadObj = p; }
1047
1048 ThreadPriority java_priority() const; // Read from threadObj()
1049
1050 // Prepare thread and add to priority queue. If a priority is
1051 // not specified, use the priority of the thread object. Threads_lock
1052 // must be held while this function is called.
1053 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1054 void prepare_ext();
1055
1056 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1057 address saved_exception_pc() { return _saved_exception_pc; }
1058
1059
1060 ThreadFunction entry_point() const { return _entry_point; }
1061
1062 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1063 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1064
1065 // Last frame anchor routines
1066
1067 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1068
1069 // last_Java_sp
1070 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1071 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1072
1073 // last_Java_pc
1074
1075 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1076
1077 // Safepoint support
1078 #if !(defined(PPC64) || defined(AARCH64))
1079 JavaThreadState thread_state() const { return _thread_state; }
1080 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1081 #else
1082 // Use membars when accessing volatile _thread_state. See
1083 // Threads::create_vm() for size checks.
1084 inline JavaThreadState thread_state() const;
1085 inline void set_thread_state(JavaThreadState s);
1086 #endif
1087 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1088 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1089 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1090
1091 // thread has called JavaThread::exit() or is terminated
1092 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1093 // thread is terminated (no longer on the threads list); we compare
1094 // against the two non-terminated values so that a freed JavaThread
1095 // will also be considered terminated.
1096 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1097 void set_terminated(TerminatedTypes t) { _terminated = t; }
1098 // special for Threads::remove() which is static:
1099 void set_terminated_value() { _terminated = _thread_terminated; }
1100 void block_if_vm_exited();
1101
1102 bool doing_unsafe_access() { return _doing_unsafe_access; }
1103 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1104
1105 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1106 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1107
1108 // Suspend/resume support for JavaThread
1109 private:
1110 inline void set_ext_suspended();
1111 inline void clear_ext_suspended();
1112
1113 public:
1114 void java_suspend();
1115 void java_resume();
1116 int java_suspend_self();
1117
1118 void check_and_wait_while_suspended() {
1119 assert(JavaThread::current() == this, "sanity check");
1120
1121 bool do_self_suspend;
1122 do {
1123 // were we externally suspended while we were waiting?
1124 do_self_suspend = handle_special_suspend_equivalent_condition();
1125 if (do_self_suspend) {
1126 // don't surprise the thread that suspended us by returning
1127 java_suspend_self();
1128 set_suspend_equivalent();
1129 }
1130 } while (do_self_suspend);
1131 }
1132 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1133 // Check for async exception in addition to safepoint and suspend request.
1134 static void check_special_condition_for_native_trans(JavaThread *thread);
1135
1136 // Same as check_special_condition_for_native_trans but finishes the
1137 // transition into thread_in_Java mode so that it can potentially
1138 // block.
1139 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1140
1141 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1142 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1143 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1144 // Warning: is_ext_suspend_completed() may temporarily drop the
1145 // SR_lock to allow the thread to reach a stable thread state if
1146 // it is currently in a transient thread state.
1147 return is_ext_suspend_completed(false /* !called_by_wait */,
1148 SuspendRetryDelay, bits);
1149 }
1150
1151 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1152 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1153 // passed as the count and delay parameters. Experiments with specific
1154 // calls to wait_for_ext_suspend_completion() can be done by passing
1155 // other values in the code. Experiments with all calls can be done
1156 // via the appropriate -XX options.
1157 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1158
1159 inline void set_external_suspend();
1160 inline void clear_external_suspend();
1161
1162 inline void set_deopt_suspend();
1163 inline void clear_deopt_suspend();
1164 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1165
1166 bool is_external_suspend() const {
1167 return (_suspend_flags & _external_suspend) != 0;
1168 }
1169 // Whenever a thread transitions from native to vm/java it must suspend
1170 // if external|deopt suspend is present.
1171 bool is_suspend_after_native() const {
1172 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1173 }
1174
1175 // external suspend request is completed
1176 bool is_ext_suspended() const {
1177 return (_suspend_flags & _ext_suspended) != 0;
1178 }
1179
1180 bool is_external_suspend_with_lock() const {
1181 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1182 return is_external_suspend();
1183 }
1184
1185 // Special method to handle a pending external suspend request
1186 // when a suspend equivalent condition lifts.
1187 bool handle_special_suspend_equivalent_condition() {
1188 assert(is_suspend_equivalent(),
1189 "should only be called in a suspend equivalence condition");
1190 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1191 bool ret = is_external_suspend();
1192 if (!ret) {
1193 // not about to self-suspend so clear suspend equivalence
1194 clear_suspend_equivalent();
1195 }
1196 // implied else:
1197 // We have a pending external suspend request so we leave the
1198 // suspend_equivalent flag set until java_suspend_self() sets
1199 // the ext_suspended flag and clears the suspend_equivalent
1200 // flag. This insures that wait_for_ext_suspend_completion()
1201 // will return consistent values.
1202 return ret;
1203 }
1204
1205 // utility methods to see if we are doing some kind of suspension
1206 bool is_being_ext_suspended() const {
1207 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1208 return is_ext_suspended() || is_external_suspend();
1209 }
1210
1211 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1212
1213 void set_suspend_equivalent() { _suspend_equivalent = true; }
1214 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1215
1216 // Thread.stop support
1217 void send_thread_stop(oop throwable);
1218 AsyncRequests clear_special_runtime_exit_condition() {
1219 AsyncRequests x = _special_runtime_exit_condition;
1220 _special_runtime_exit_condition = _no_async_condition;
1221 return x;
1222 }
1223
1224 // Are any async conditions present?
1225 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1226
1227 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1228
1229 // these next two are also used for self-suspension and async exception support
1230 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1231
1232 // Return true if JavaThread has an asynchronous condition or
1233 // if external suspension is requested.
1234 bool has_special_runtime_exit_condition() {
1235 // We call is_external_suspend() last since external suspend should
1236 // be less common. Because we don't use is_external_suspend_with_lock
1237 // it is possible that we won't see an asynchronous external suspend
1238 // request that has just gotten started, i.e., SR_lock grabbed but
1239 // _external_suspend field change either not made yet or not visible
1240 // yet. However, this is okay because the request is asynchronous and
1241 // we will see the new flag value the next time through. It's also
1242 // possible that the external suspend request is dropped after
1243 // we have checked is_external_suspend(), we will recheck its value
1244 // under SR_lock in java_suspend_self().
1245 return (_special_runtime_exit_condition != _no_async_condition) ||
1246 is_external_suspend() || is_deopt_suspend();
1247 }
1248
1249 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1250
1251 inline void set_pending_async_exception(oop e);
1252
1253 // Fast-locking support
1254 bool is_lock_owned(address adr) const;
1255
1256 // Accessors for vframe array top
1257 // The linked list of vframe arrays are sorted on sp. This means when we
1258 // unpack the head must contain the vframe array to unpack.
1259 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1260 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1261
1262 // Side structure for deferring update of java frame locals until deopt occurs
1263 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1264 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1265
1266 // These only really exist to make debugging deopt problems simpler
1267
1268 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1269 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1270
1271 // The special resourceMark used during deoptimization
1272
1273 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1274 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1275
1276 intptr_t* must_deopt_id() { return _must_deopt_id; }
1277 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1278 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1279
1280 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1281 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1282
1283 Method* callee_target() const { return _callee_target; }
1284 void set_callee_target (Method* x) { _callee_target = x; }
1285
1286 // Oop results of vm runtime calls
1287 oop vm_result() const { return _vm_result; }
1288 void set_vm_result (oop x) { _vm_result = x; }
1289
1290 Metadata* vm_result_2() const { return _vm_result_2; }
1291 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1292
1293 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1294 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1295
1296 #if INCLUDE_JVMCI
1297 int pending_deoptimization() const { return _pending_deoptimization; }
1298 oop pending_failed_speculation() const { return _pending_failed_speculation; }
1299 bool has_pending_monitorenter() const { return _pending_monitorenter; }
1300 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
1301 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
1302 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; }
1303 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
1304 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
1305 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
1306 #endif
1307
1308 // Exception handling for compiled methods
1309 oop exception_oop() const { return _exception_oop; }
1310 address exception_pc() const { return _exception_pc; }
1311 address exception_handler_pc() const { return _exception_handler_pc; }
1312 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1313
1314 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1315 void set_exception_pc(address a) { _exception_pc = a; }
1316 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1317 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1318
1319 void clear_exception_oop_and_pc() {
1320 set_exception_oop(NULL);
1321 set_exception_pc(NULL);
1322 }
1323
1324 // Stack overflow support
1325 inline size_t stack_available(address cur_sp);
1326 address stack_yellow_zone_base() {
1327 return (address)(stack_base() -
1328 (stack_size() -
1329 (stack_red_zone_size() + stack_yellow_zone_size())));
1330 }
1331 size_t stack_yellow_zone_size() {
1332 return StackYellowPages * os::vm_page_size();
1333 }
1334 address stack_red_zone_base() {
1335 return (address)(stack_base() - (stack_size() - stack_red_zone_size()));
1336 }
1337 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); }
1338 bool in_stack_yellow_zone(address a) {
1339 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base());
1340 }
1341 bool in_stack_red_zone(address a) {
1342 return (a <= stack_red_zone_base()) &&
1343 (a >= (address)((intptr_t)stack_base() - stack_size()));
1344 }
1345
1346 void create_stack_guard_pages();
1347 void remove_stack_guard_pages();
1348
1349 void enable_stack_yellow_zone();
1350 void disable_stack_yellow_zone();
1351 void enable_stack_red_zone();
1352 void disable_stack_red_zone();
1353
1354 inline bool stack_guard_zone_unused();
1355 inline bool stack_yellow_zone_disabled();
1356 inline bool stack_yellow_zone_enabled();
1357
1358 // Attempt to reguard the stack after a stack overflow may have occurred.
1359 // Returns true if (a) guard pages are not needed on this thread, (b) the
1360 // pages are already guarded, or (c) the pages were successfully reguarded.
1361 // Returns false if there is not enough stack space to reguard the pages, in
1362 // which case the caller should unwind a frame and try again. The argument
1363 // should be the caller's (approximate) sp.
1364 bool reguard_stack(address cur_sp);
1365 // Similar to above but see if current stackpoint is out of the guard area
1366 // and reguard if possible.
1367 bool reguard_stack(void);
1368
1369 address stack_overflow_limit() { return _stack_overflow_limit; }
1370 void set_stack_overflow_limit() {
1371 _stack_overflow_limit = _stack_base - _stack_size +
1372 ((StackShadowPages +
1373 StackYellowPages +
1374 StackRedPages) * os::vm_page_size());
1375 }
1376
1377 // Misc. accessors/mutators
1378 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1379 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1380 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1381
1382 #ifndef PRODUCT
1383 void record_jump(address target, address instr, const char* file, int line);
1384 #endif // PRODUCT
1385
1386 // For assembly stub generation
1387 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1388 #ifndef PRODUCT
1389 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1390 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1391 #endif // PRODUCT
1392 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1393 static ByteSize last_Java_sp_offset() {
1394 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1395 }
1396 static ByteSize last_Java_pc_offset() {
1397 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1398 }
1399 static ByteSize frame_anchor_offset() {
1400 return byte_offset_of(JavaThread, _anchor);
1401 }
1402 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1403 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1404 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1405 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1406 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1407 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1408 #if INCLUDE_JVMCI
1409 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
1410 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
1411 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); }
1412 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
1413 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
1414 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
1415 #endif
1416 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1417 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1418 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1419 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1420 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1421 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1422 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1423
1424 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1425 static ByteSize should_post_on_exceptions_flag_offset() {
1426 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1427 }
1428
1429 #if INCLUDE_ALL_GCS
1430 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1431 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1432 #endif // INCLUDE_ALL_GCS
1433
1434 // Returns the jni environment for this thread
1435 JNIEnv* jni_environment() { return &_jni_environment; }
1436
1437 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1438 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1439 // Only return NULL if thread is off the thread list; starting to
1440 // exit should not return NULL.
1441 if (thread_from_jni_env->is_terminated()) {
1442 thread_from_jni_env->block_if_vm_exited();
1443 return NULL;
1444 } else {
1445 return thread_from_jni_env;
1446 }
1447 }
1448
1449 // JNI critical regions. These can nest.
1450 bool in_critical() { return _jni_active_critical > 0; }
1451 bool in_last_critical() { return _jni_active_critical == 1; }
1452 void enter_critical() {
1453 assert(Thread::current() == this ||
1454 (Thread::current()->is_VM_thread() &&
1455 SafepointSynchronize::is_synchronizing()),
1456 "this must be current thread or synchronizing");
1457 _jni_active_critical++;
1458 }
1459 void exit_critical() {
1460 assert(Thread::current() == this, "this must be current thread");
1461 _jni_active_critical--;
1462 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1463 }
1464
1465 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1466 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1467 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1468 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1469 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1470
1471 // For deadlock detection
1472 int depth_first_number() { return _depth_first_number; }
1473 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1474
1475 private:
1476 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1477
1478 public:
1479 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1480 void add_monitor_chunk(MonitorChunk* chunk);
1481 void remove_monitor_chunk(MonitorChunk* chunk);
1482 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1483 void inc_in_deopt_handler() { _in_deopt_handler++; }
1484 void dec_in_deopt_handler() {
1485 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1486 if (_in_deopt_handler > 0) { // robustness
1487 _in_deopt_handler--;
1488 }
1489 }
1490
1491 private:
1492 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1493
1494 public:
1495
1496 // Frame iteration; calls the function f for all frames on the stack
1497 void frames_do(void f(frame*, const RegisterMap*));
1498
1499 // Memory operations
1500 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1501
1502 // Sweeper operations
1503 void nmethods_do(CodeBlobClosure* cf);
1504
1505 // RedefineClasses Support
1506 void metadata_do(void f(Metadata*));
1507
1508 // Misc. operations
1509 char* name() const { return (char*)get_thread_name(); }
1510 void print_on(outputStream* st) const;
1511 void print_value();
1512 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1513 void print_thread_state() const PRODUCT_RETURN;
1514 void print_on_error(outputStream* st, char* buf, int buflen) const;
1515 void verify();
1516 const char* get_thread_name() const;
1517 private:
1518 // factor out low-level mechanics for use in both normal and error cases
1519 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1520 public:
1521 const char* get_threadgroup_name() const;
1522 const char* get_parent_name() const;
1523
1524 // Accessing frames
1525 frame last_frame() {
1526 _anchor.make_walkable(this);
1527 return pd_last_frame();
1528 }
1529 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1530
1531 // Returns method at 'depth' java or native frames down the stack
1532 // Used for security checks
1533 Klass* security_get_caller_class(int depth);
1534
1535 // Print stack trace in external format
1536 void print_stack_on(outputStream* st);
1537 void print_stack() { print_stack_on(tty); }
1538
1539 // Print stack traces in various internal formats
1540 void trace_stack() PRODUCT_RETURN;
1541 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1542 void trace_frames() PRODUCT_RETURN;
1543 void trace_oops() PRODUCT_RETURN;
1544
1545 // Print an annotated view of the stack frames
1546 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1547 void validate_frame_layout() {
1548 print_frame_layout(0, true);
1549 }
1550
1551 // Returns the number of stack frames on the stack
1552 int depth() const;
1553
1554 // Function for testing deoptimization
1555 void deoptimize();
1556 void make_zombies();
1557
1558 void deoptimized_wrt_marked_nmethods();
1559
1560 // Profiling operation (see fprofile.cpp)
1561 public:
1562 bool profile_last_Java_frame(frame* fr);
1563
1564 private:
1565 ThreadProfiler* _thread_profiler;
1566 private:
1567 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1568 friend class FlatProfilerTask; // uses get_thread_profiler.
1569 friend class ThreadProfilerMark; // uses get_thread_profiler.
1570 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1571 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1572 ThreadProfiler* result = _thread_profiler;
1573 _thread_profiler = tp;
1574 return result;
1575 }
1576
1577 public:
1578 // Returns the running thread as a JavaThread
1579 static inline JavaThread* current();
1580
1581 // Returns the active Java thread. Do not use this if you know you are calling
1582 // from a JavaThread, as it's slower than JavaThread::current. If called from
1583 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1584 // operation. You may not want that either.
1585 static JavaThread* active();
1586
1587 inline CompilerThread* as_CompilerThread();
1588
1589 public:
1590 virtual void run();
1591 void thread_main_inner();
1592
1593 private:
1594 // PRIVILEGED STACK
1595 PrivilegedElement* _privileged_stack_top;
1596 GrowableArray<oop>* _array_for_gc;
1597 public:
1598
1599 // Returns the privileged_stack information.
1600 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1601 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1602 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1603
1604 public:
1605 // Thread local information maintained by JVMTI.
1606 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1607 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1608 // getter is used to get this JavaThread's JvmtiThreadState if it has
1609 // one which means NULL can be returned. JvmtiThreadState::state_for()
1610 // is used to get the specified JavaThread's JvmtiThreadState if it has
1611 // one or it allocates a new JvmtiThreadState for the JavaThread and
1612 // returns it. JvmtiThreadState::state_for() will return NULL only if
1613 // the specified JavaThread is exiting.
1614 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1615 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1616 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1617 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1618
1619 // JVMTI PopFrame support
1620 // Setting and clearing popframe_condition
1621 // All of these enumerated values are bits. popframe_pending
1622 // indicates that a PopFrame() has been requested and not yet been
1623 // completed. popframe_processing indicates that that PopFrame() is in
1624 // the process of being completed. popframe_force_deopt_reexecution_bit
1625 // indicates that special handling is required when returning to a
1626 // deoptimized caller.
1627 enum PopCondition {
1628 popframe_inactive = 0x00,
1629 popframe_pending_bit = 0x01,
1630 popframe_processing_bit = 0x02,
1631 popframe_force_deopt_reexecution_bit = 0x04
1632 };
1633 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1634 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1635 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1636 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1637 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1638 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1639 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1640 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1641 #ifdef CC_INTERP
1642 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1643 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1644 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1645 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1646 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1647 #endif
1648
1649 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1650 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1651 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1652
1653 private:
1654 // Saved incoming arguments to popped frame.
1655 // Used only when popped interpreted frame returns to deoptimized frame.
1656 void* _popframe_preserved_args;
1657 int _popframe_preserved_args_size;
1658
1659 public:
1660 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1661 void* popframe_preserved_args();
1662 ByteSize popframe_preserved_args_size();
1663 WordSize popframe_preserved_args_size_in_words();
1664 void popframe_free_preserved_args();
1665
1666
1667 private:
1668 JvmtiThreadState *_jvmti_thread_state;
1669 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1670
1671 // Used by the interpreter in fullspeed mode for frame pop, method
1672 // entry, method exit and single stepping support. This field is
1673 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1674 // It can be set to zero asynchronously (i.e., without a VM operation
1675 // or a lock) so we have to be very careful.
1676 int _interp_only_mode;
1677
1678 public:
1679 // used by the interpreter for fullspeed debugging support (see above)
1680 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1681 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1682 int get_interp_only_mode() { return _interp_only_mode; }
1683 void increment_interp_only_mode() { ++_interp_only_mode; }
1684 void decrement_interp_only_mode() { --_interp_only_mode; }
1685
1686 // support for cached flag that indicates whether exceptions need to be posted for this thread
1687 // if this is false, we can avoid deoptimizing when events are thrown
1688 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1689 private:
1690 int _should_post_on_exceptions_flag;
1691
1692 public:
1693 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1694 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1695
1696 private:
1697 ThreadStatistics *_thread_stat;
1698
1699 public:
1700 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1701
1702 // Return a blocker object for which this thread is blocked parking.
1703 oop current_park_blocker();
1704
1705 private:
1706 static size_t _stack_size_at_create;
1707
1708 public:
1709 static inline size_t stack_size_at_create(void) {
1710 return _stack_size_at_create;
1711 }
1712 static inline void set_stack_size_at_create(size_t value) {
1713 _stack_size_at_create = value;
1714 }
1715
1716 #if INCLUDE_ALL_GCS
1717 // SATB marking queue support
1718 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1719 static SATBMarkQueueSet& satb_mark_queue_set() {
1720 return _satb_mark_queue_set;
1721 }
1722
1723 // Dirty card queue support
1724 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1725 static DirtyCardQueueSet& dirty_card_queue_set() {
1726 return _dirty_card_queue_set;
1727 }
1728 #endif // INCLUDE_ALL_GCS
1729
1730 // This method initializes the SATB and dirty card queues before a
1731 // JavaThread is added to the Java thread list. Right now, we don't
1732 // have to do anything to the dirty card queue (it should have been
1733 // activated when the thread was created), but we have to activate
1734 // the SATB queue if the thread is created while a marking cycle is
1735 // in progress. The activation / de-activation of the SATB queues at
1736 // the beginning / end of a marking cycle is done during safepoints
1737 // so we have to make sure this method is called outside one to be
1738 // able to safely read the active field of the SATB queue set. Right
1739 // now, it is called just before the thread is added to the Java
1740 // thread list in the Threads::add() method. That method is holding
1741 // the Threads_lock which ensures we are outside a safepoint. We
1742 // cannot do the obvious and set the active field of the SATB queue
1743 // when the thread is created given that, in some cases, safepoints
1744 // might happen between the JavaThread constructor being called and the
1745 // thread being added to the Java thread list (an example of this is
1746 // when the structure for the DestroyJavaVM thread is created).
1747 #if INCLUDE_ALL_GCS
1748 void initialize_queues();
1749 #else // INCLUDE_ALL_GCS
1750 void initialize_queues() { }
1751 #endif // INCLUDE_ALL_GCS
1752
1753 // Machine dependent stuff
1754 #ifdef TARGET_OS_ARCH_linux_x86
1755 # include "thread_linux_x86.hpp"
1756 #endif
1757 #ifdef TARGET_OS_ARCH_linux_sparc
1758 # include "thread_linux_sparc.hpp"
1759 #endif
1760 #ifdef TARGET_OS_ARCH_linux_zero
1761 # include "thread_linux_zero.hpp"
1762 #endif
1763 #ifdef TARGET_OS_ARCH_solaris_x86
1764 # include "thread_solaris_x86.hpp"
1765 #endif
1766 #ifdef TARGET_OS_ARCH_solaris_sparc
1767 # include "thread_solaris_sparc.hpp"
1768 #endif
1769 #ifdef TARGET_OS_ARCH_windows_x86
1770 # include "thread_windows_x86.hpp"
1771 #endif
1772 #ifdef TARGET_OS_ARCH_linux_arm
1773 # include "thread_linux_arm.hpp"
1774 #endif
1775 #ifdef TARGET_OS_ARCH_linux_ppc
1776 # include "thread_linux_ppc.hpp"
1777 #endif
1778 #ifdef TARGET_OS_ARCH_linux_aarch64
1779 # include "thread_linux_aarch64.hpp"
1780 #endif
1781 #ifdef TARGET_OS_ARCH_aix_ppc
1782 # include "thread_aix_ppc.hpp"
1783 #endif
1784 #ifdef TARGET_OS_ARCH_bsd_x86
1785 # include "thread_bsd_x86.hpp"
1786 #endif
1787 #ifdef TARGET_OS_ARCH_bsd_zero
1788 # include "thread_bsd_zero.hpp"
1789 #endif
1790
1791
1792 public:
1793 void set_blocked_on_compilation(bool value) {
1794 _blocked_on_compilation = value;
1795 }
1796
1797 bool blocked_on_compilation() {
1798 return _blocked_on_compilation;
1799 }
1800 protected:
1801 bool _blocked_on_compilation;
1802
1803
1804 // JSR166 per-thread parker
1805 private:
1806 Parker* _parker;
1807 public:
1808 Parker* parker() { return _parker; }
1809
1810 // Biased locking support
1811 private:
1812 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1813 public:
1814 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1815 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1816
1817 // clearing/querying jni attach status
1818 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1819 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1820 inline void set_done_attaching_via_jni();
1821 private:
1822 // This field is used to determine if a thread has claimed
1823 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1824 // otherwise its value is the par_id that has been claimed.
1825 uint _claimed_par_id;
1826 public:
1827 uint get_claimed_par_id() { return _claimed_par_id; }
1828 void set_claimed_par_id(uint id) { _claimed_par_id = id; }
1829 };
1830
1831 // Inline implementation of JavaThread::current
1832 inline JavaThread* JavaThread::current() {
1833 Thread* thread = ThreadLocalStorage::thread();
1834 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1835 return (JavaThread*)thread;
1836 }
1837
1838 inline CompilerThread* JavaThread::as_CompilerThread() {
1839 assert(is_Compiler_thread(), "just checking");
1840 return (CompilerThread*)this;
1841 }
1842
1843 // Dedicated thread to sweep the code cache
1844 class CodeCacheSweeperThread : public JavaThread {
1845 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1846 public:
1847 CodeCacheSweeperThread();
1848 // Track the nmethod currently being scanned by the sweeper
1849 void set_scanned_nmethod(nmethod* nm) {
1850 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1851 _scanned_nmethod = nm;
1852 }
1853
1854 // Hide sweeper thread from external view.
1855 bool is_hidden_from_external_view() const { return true; }
1856
1857 bool is_Code_cache_sweeper_thread() const { return true; }
1858 // GC support
1859 // Apply "f->do_oop" to all root oops in "this".
1860 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1861 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1862 };
1863
1864 // A thread used for Compilation.
1865 class CompilerThread : public JavaThread {
1866 friend class VMStructs;
1867 private:
1868 CompilerCounters* _counters;
1869
1870 ciEnv* _env;
1871 CompileLog* _log;
1872 CompileTask* _task;
1873 CompileQueue* _queue;
1874 BufferBlob* _buffer_blob;
1875
1876 AbstractCompiler* _compiler;
1877
1878 public:
1879
1880 static CompilerThread* current();
1881
1882 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1883
1884 bool is_Compiler_thread() const { return true; }
1885
1886 virtual bool can_call_java() const;
1887
1888 // Hide native compiler threads from external view.
1889 bool is_hidden_from_external_view() const { return !can_call_java(); }
1890
1891 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1892 AbstractCompiler* compiler() const { return _compiler; }
1893
1894 CompileQueue* queue() const { return _queue; }
1895 CompilerCounters* counters() const { return _counters; }
1896
1897 // Get/set the thread's compilation environment.
1898 ciEnv* env() { return _env; }
1899 void set_env(ciEnv* env) { _env = env; }
1900
1901 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1902 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
1903
1904 // Get/set the thread's logging information
1905 CompileLog* log() { return _log; }
1906 void init_log(CompileLog* log) {
1907 // Set once, for good.
1908 assert(_log == NULL, "set only once");
1909 _log = log;
1910 }
1911
1912 #ifndef PRODUCT
1913 private:
1914 IdealGraphPrinter *_ideal_graph_printer;
1915 public:
1916 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1917 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1918 #endif
1919
1920 // Get/set the thread's current task
1921 CompileTask* task() { return _task; }
1922 void set_task(CompileTask* task) { _task = task; }
1923 };
1924
1925 inline CompilerThread* CompilerThread::current() {
1926 return JavaThread::current()->as_CompilerThread();
1927 }
1928
1929 // The active thread queue. It also keeps track of the current used
1930 // thread priorities.
1931 class Threads: AllStatic {
1932 friend class VMStructs;
1933 private:
1934 static JavaThread* _thread_list;
1935 static int _number_of_threads;
1936 static int _number_of_non_daemon_threads;
1937 static int _return_code;
1938 static int _thread_claim_parity;
1939 #ifdef ASSERT
1940 static bool _vm_complete;
1941 #endif
1942
1943 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
1944 static void initialize_jsr292_core_classes(TRAPS);
1945 public:
1946 // Thread management
1947 // force_daemon is a concession to JNI, where we may need to add a
1948 // thread to the thread list before allocating its thread object
1949 static void add(JavaThread* p, bool force_daemon = false);
1950 static void remove(JavaThread* p);
1951 static bool includes(JavaThread* p);
1952 static JavaThread* first() { return _thread_list; }
1953 static void threads_do(ThreadClosure* tc);
1954
1955 // Initializes the vm and creates the vm thread
1956 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1957 static void convert_vm_init_libraries_to_agents();
1958 static void create_vm_init_libraries();
1959 static void create_vm_init_agents();
1960 static void shutdown_vm_agents();
1961 static bool destroy_vm();
1962 // Supported VM versions via JNI
1963 // Includes JNI_VERSION_1_1
1964 static jboolean is_supported_jni_version_including_1_1(jint version);
1965 // Does not include JNI_VERSION_1_1
1966 static jboolean is_supported_jni_version(jint version);
1967
1968 // The "thread claim parity" provides a way for threads to be claimed
1969 // by parallel worker tasks.
1970 //
1971 // Each thread contains a a "parity" field. A task will claim the
1972 // thread only if its parity field is the same as the global parity,
1973 // which is updated by calling change_thread_claim_parity().
1974 //
1975 // For this to work change_thread_claim_parity() needs to be called
1976 // exactly once in sequential code before starting parallel tasks
1977 // that should claim threads.
1978 //
1979 // New threads get their parity set to 0 and change_thread_claim_parity()
1980 // never set the global parity to 0.
1981 static int thread_claim_parity() { return _thread_claim_parity; }
1982 static void change_thread_claim_parity();
1983 static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
1984
1985 // Apply "f->do_oop" to all root oops in all threads.
1986 // This version may only be called by sequential code.
1987 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1988 // This version may be called by sequential or parallel code.
1989 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1990 // This creates a list of GCTasks, one per thread.
1991 static void create_thread_roots_tasks(GCTaskQueue* q);
1992 // This creates a list of GCTasks, one per thread, for marking objects.
1993 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1994
1995 // Apply "f->do_oop" to roots in all threads that
1996 // are part of compiled frames
1997 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1998
1999 static void convert_hcode_pointers();
2000 static void restore_hcode_pointers();
2001
2002 // Sweeper
2003 static void nmethods_do(CodeBlobClosure* cf);
2004
2005 // RedefineClasses support
2006 static void metadata_do(void f(Metadata*));
2007 static void metadata_handles_do(void f(Metadata*));
2008
2009 #ifdef ASSERT
2010 static bool is_vm_complete() { return _vm_complete; }
2011 #endif
2012
2013 // Verification
2014 static void verify();
2015 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
2016 static void print(bool print_stacks, bool internal_format) {
2017 // this function is only used by debug.cpp
2018 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
2019 }
2020 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2021
2022 // Get Java threads that are waiting to enter a monitor. If doLock
2023 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2024 // VM needs to be at a safepoint.
2025 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2026 address monitor, bool doLock);
2027
2028 // Get owning Java thread from the monitor's owner field. If doLock
2029 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2030 // VM needs to be at a safepoint.
2031 static JavaThread *owning_thread_from_monitor_owner(address owner,
2032 bool doLock);
2033
2034 // Number of threads on the active threads list
2035 static int number_of_threads() { return _number_of_threads; }
2036 // Number of non-daemon threads on the active threads list
2037 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2038
2039 // Deoptimizes all frames tied to marked nmethods
2040 static void deoptimized_wrt_marked_nmethods();
2041
2042 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2043
2044 };
2045
2046
2047 // Thread iterator
2048 class ThreadClosure: public StackObj {
2049 public:
2050 virtual void do_thread(Thread* thread) = 0;
2051 };
2052
2053 class SignalHandlerMark: public StackObj {
2054 private:
2055 Thread* _thread;
2056 public:
2057 SignalHandlerMark(Thread* t) {
2058 _thread = t;
2059 if (_thread) _thread->enter_signal_handler();
2060 }
2061 ~SignalHandlerMark() {
2062 if (_thread) _thread->leave_signal_handler();
2063 _thread = NULL;
2064 }
2065 };
2066
2067
2068 #endif // SHARE_VM_RUNTIME_THREAD_HPP