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/satbMarkQueue.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
106 #ifndef USE_LIBRARY_BASED_TLS_ONLY
107 // Current thread is maintained as a thread-local variable
108 static THREAD_LOCAL_DECL Thread* _thr_current;
109 #endif
110
111 // Exception handling
112 // (Note: _pending_exception and friends are in ThreadShadow)
113 //oop _pending_exception; // pending exception for current thread
114 // const char* _exception_file; // file information for exception (debugging only)
115 // int _exception_line; // line information for exception (debugging only)
116 protected:
117 // Support for forcing alignment of thread objects for biased locking
118 void* _real_malloc_address;
119 public:
120 void* operator new(size_t size) throw() { return allocate(size, true); }
121 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
122 return allocate(size, false); }
123 void operator delete(void* p);
124
125 protected:
126 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
127 private:
128
129 // ***************************************************************
130 // Suspend and resume support
131 // ***************************************************************
132 //
133 // VM suspend/resume no longer exists - it was once used for various
134 // things including safepoints but was deprecated and finally removed
135 // in Java 7. Because VM suspension was considered "internal" Java-level
136 // suspension was considered "external", and this legacy naming scheme
137 // remains.
138 //
139 // External suspend/resume requests come from JVM_SuspendThread,
140 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
141 // ResumeThread. External
142 // suspend requests cause _external_suspend to be set and external
143 // resume requests cause _external_suspend to be cleared.
144 // External suspend requests do not nest on top of other external
145 // suspend requests. The higher level APIs reject suspend requests
146 // for already suspended threads.
147 //
148 // The external_suspend
149 // flag is checked by has_special_runtime_exit_condition() and java thread
150 // will self-suspend when handle_special_runtime_exit_condition() is
151 // called. Most uses of the _thread_blocked state in JavaThreads are
152 // considered the same as being externally suspended; if the blocking
153 // condition lifts, the JavaThread will self-suspend. Other places
154 // where VM checks for external_suspend include:
155 // + mutex granting (do not enter monitors when thread is suspended)
156 // + state transitions from _thread_in_native
157 //
158 // In general, java_suspend() does not wait for an external suspend
159 // request to complete. When it returns, the only guarantee is that
160 // the _external_suspend field is true.
161 //
162 // wait_for_ext_suspend_completion() is used to wait for an external
163 // suspend request to complete. External suspend requests are usually
164 // followed by some other interface call that requires the thread to
165 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
166 // the interface that requires quiescence, we give the JavaThread a
167 // chance to self-suspend before we need it to be quiescent. This
168 // improves overall suspend/query performance.
169 //
170 // _suspend_flags controls the behavior of java_ suspend/resume.
171 // It must be set under the protection of SR_lock. Read from the flag is
172 // OK without SR_lock as long as the value is only used as a hint.
173 // (e.g., check _external_suspend first without lock and then recheck
174 // inside SR_lock and finish the suspension)
175 //
176 // _suspend_flags is also overloaded for other "special conditions" so
177 // that a single check indicates whether any special action is needed
178 // eg. for async exceptions.
179 // -------------------------------------------------------------------
180 // Notes:
181 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
182 // but we still update its value to keep other part of the system (mainly
183 // JVMTI) happy. ThreadState is legacy code (see notes in
184 // osThread.hpp).
185 //
186 // 2. It would be more natural if set_external_suspend() is private and
187 // part of java_suspend(), but that probably would affect the suspend/query
188 // performance. Need more investigation on this.
189
190 // suspend/resume lock: used for self-suspend
191 Monitor* _SR_lock;
192
193 protected:
194 enum SuspendFlags {
195 // NOTE: avoid using the sign-bit as cc generates different test code
196 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
197
198 _external_suspend = 0x20000000U, // thread is asked to self suspend
199 _ext_suspended = 0x40000000U, // thread has self-suspended
200 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
201
202 _has_async_exception = 0x00000001U, // there is a pending async exception
203 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
204 };
205
206 // various suspension related flags - atomically updated
207 // overloaded for async exception checking in check_special_condition_for_native_trans.
208 volatile uint32_t _suspend_flags;
209
210 private:
211 int _num_nested_signal;
212
213 DEBUG_ONLY(bool _suspendible_thread;)
214
215 public:
216 void enter_signal_handler() { _num_nested_signal++; }
217 void leave_signal_handler() { _num_nested_signal--; }
218 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
219
220 #ifdef ASSERT
221 void set_suspendible_thread() {
222 _suspendible_thread = true;
223 }
224
225 void clear_suspendible_thread() {
226 _suspendible_thread = false;
227 }
228
229 bool is_suspendible_thread() { return _suspendible_thread; }
230 #endif
231
232 private:
233 // Active_handles points to a block of handles
234 JNIHandleBlock* _active_handles;
235
236 // One-element thread local free list
237 JNIHandleBlock* _free_handle_block;
238
239 // Point to the last handle mark
240 HandleMark* _last_handle_mark;
241
242 // The parity of the last strong_roots iteration in which this thread was
243 // claimed as a task.
244 jint _oops_do_parity;
245
246 public:
247 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
248 HandleMark* last_handle_mark() const { return _last_handle_mark; }
249 private:
250
251 // debug support for checking if code does allow safepoints or not
252 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
253 // mutex, or blocking on an object synchronizer (Java locking).
254 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
255 // If !allow_allocation(), then an assertion failure will happen during allocation
256 // (Hence, !allow_safepoint() => !allow_allocation()).
257 //
258 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
259 //
260 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
261 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
262
263 // Used by SkipGCALot class.
264 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
265
266 friend class No_Alloc_Verifier;
267 friend class No_Safepoint_Verifier;
268 friend class Pause_No_Safepoint_Verifier;
269 friend class GC_locker;
270
271 ThreadLocalAllocBuffer _tlab; // Thread-local eden
272 jlong _allocated_bytes; // Cumulative number of bytes allocated on
273 // the Java heap
274
275 mutable TRACE_DATA _trace_data; // Thread-local data for tracing
276
277 ThreadExt _ext;
278
279 int _vm_operation_started_count; // VM_Operation support
280 int _vm_operation_completed_count; // VM_Operation support
281
282 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
283 // is waiting to lock
284 bool _current_pending_monitor_is_from_java; // locking is from Java code
285
286 // ObjectMonitor on which this thread called Object.wait()
287 ObjectMonitor* _current_waiting_monitor;
288
289 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
290 public:
291 ObjectMonitor* omFreeList;
292 int omFreeCount; // length of omFreeList
293 int omFreeProvision; // reload chunk size
294 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
295 int omInUseCount; // length of omInUseList
296
297 #ifdef ASSERT
298 private:
299 bool _visited_for_critical_count;
300
301 public:
302 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
303 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
304 #endif
305
306 public:
307 enum {
308 is_definitely_current_thread = true
309 };
310
311 // Constructor
312 Thread();
313 virtual ~Thread();
314
315 // Manage Thread::current()
316 void initialize_thread_current();
317 private:
318 void clear_thread_current(); // needed for detaching JNI threads
319
320 public:
321 // thread entry point
322 virtual void run();
323
324 // Testers
325 virtual bool is_VM_thread() const { return false; }
326 virtual bool is_Java_thread() const { return false; }
327 virtual bool is_Compiler_thread() const { return false; }
328 virtual bool is_Code_cache_sweeper_thread() const { return false; }
329 virtual bool is_hidden_from_external_view() const { return false; }
330 virtual bool is_jvmti_agent_thread() const { return false; }
331 // True iff the thread can perform GC operations at a safepoint.
332 // Generally will be true only of VM thread and parallel GC WorkGang
333 // threads.
334 virtual bool is_GC_task_thread() const { return false; }
335 virtual bool is_Watcher_thread() const { return false; }
336 virtual bool is_ConcurrentGC_thread() const { return false; }
337 virtual bool is_Named_thread() const { return false; }
338 virtual bool is_Worker_thread() const { return false; }
339
340 // Can this thread make Java upcalls
341 virtual bool can_call_java() const { return false; }
342
343 // Casts
344 virtual WorkerThread* as_Worker_thread() const { return NULL; }
345
346 virtual char* name() const { return (char*)"Unknown thread"; }
347
348 // Returns the current thread (ASSERTS if NULL)
349 static inline Thread* current();
350 // Returns the current thread, or NULL if not attached
351 static inline Thread* current_or_null();
352 // Returns the current thread, or NULL if not attached, and is
353 // safe for use from signal-handlers
354 static inline Thread* current_or_null_safe();
355
356 // Common thread operations
357 static void set_priority(Thread* thread, ThreadPriority priority);
358 static ThreadPriority get_priority(const Thread* const thread);
359 static void start(Thread* thread);
360 static void interrupt(Thread* thr);
361 static bool is_interrupted(Thread* thr, bool clear_interrupted);
362
363 void set_native_thread_name(const char *name) {
364 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
365 os::set_native_thread_name(name);
366 }
367
368 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
369 Monitor* SR_lock() const { return _SR_lock; }
370
371 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
372
373 inline void set_suspend_flag(SuspendFlags f);
374 inline void clear_suspend_flag(SuspendFlags f);
375
376 inline void set_has_async_exception();
377 inline void clear_has_async_exception();
378
379 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
380
381 inline void set_critical_native_unlock();
382 inline void clear_critical_native_unlock();
383
384 // Support for Unhandled Oop detection
385 // Add the field for both, fastdebug and debug, builds to keep
386 // Thread's fields layout the same.
387 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build.
388 #ifdef CHECK_UNHANDLED_OOPS
389 private:
390 UnhandledOops* _unhandled_oops;
391 #elif defined(ASSERT)
392 private:
393 void* _unhandled_oops;
394 #endif
395 #ifdef CHECK_UNHANDLED_OOPS
396 public:
397 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
398 // Mark oop safe for gc. It may be stack allocated but won't move.
399 void allow_unhandled_oop(oop *op) {
400 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
401 }
402 // Clear oops at safepoint so crashes point to unhandled oop violator
403 void clear_unhandled_oops() {
404 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
405 }
406 #endif // CHECK_UNHANDLED_OOPS
407
408 public:
409 #ifndef PRODUCT
410 bool skip_gcalot() { return _skip_gcalot; }
411 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
412 #endif
413
414 // Installs a pending exception to be inserted later
415 static void send_async_exception(oop thread_oop, oop java_throwable);
416
417 // Resource area
418 ResourceArea* resource_area() const { return _resource_area; }
419 void set_resource_area(ResourceArea* area) { _resource_area = area; }
420
421 OSThread* osthread() const { return _osthread; }
422 void set_osthread(OSThread* thread) { _osthread = thread; }
423
424 // JNI handle support
425 JNIHandleBlock* active_handles() const { return _active_handles; }
426 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
427 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
428 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
429
430 // Internal handle support
431 HandleArea* handle_area() const { return _handle_area; }
432 void set_handle_area(HandleArea* area) { _handle_area = area; }
433
434 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
435 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
436
437 // Thread-Local Allocation Buffer (TLAB) support
438 ThreadLocalAllocBuffer& tlab() { return _tlab; }
439 void initialize_tlab() {
440 if (UseTLAB) {
441 tlab().initialize();
442 }
443 }
444
445 jlong allocated_bytes() { return _allocated_bytes; }
446 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
447 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
448 inline jlong cooked_allocated_bytes();
449
450 TRACE_DATA* trace_data() { return &_trace_data; }
451
452 const ThreadExt& ext() const { return _ext; }
453 ThreadExt& ext() { return _ext; }
454
455 // VM operation support
456 int vm_operation_ticket() { return ++_vm_operation_started_count; }
457 int vm_operation_completed_count() { return _vm_operation_completed_count; }
458 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
459
460 // For tracking the heavyweight monitor the thread is pending on.
461 ObjectMonitor* current_pending_monitor() {
462 return _current_pending_monitor;
463 }
464 void set_current_pending_monitor(ObjectMonitor* monitor) {
465 _current_pending_monitor = monitor;
466 }
467 void set_current_pending_monitor_is_from_java(bool from_java) {
468 _current_pending_monitor_is_from_java = from_java;
469 }
470 bool current_pending_monitor_is_from_java() {
471 return _current_pending_monitor_is_from_java;
472 }
473
474 // For tracking the ObjectMonitor on which this thread called Object.wait()
475 ObjectMonitor* current_waiting_monitor() {
476 return _current_waiting_monitor;
477 }
478 void set_current_waiting_monitor(ObjectMonitor* monitor) {
479 _current_waiting_monitor = monitor;
480 }
481
482 // GC support
483 // Apply "f->do_oop" to all root oops in "this".
484 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
485 // Used by JavaThread::oops_do.
486 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
487 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
488
489 // Handles the parallel case for the method below.
490 private:
491 bool claim_oops_do_par_case(int collection_parity);
492 public:
493 // Requires that "collection_parity" is that of the current roots
494 // iteration. If "is_par" is false, sets the parity of "this" to
495 // "collection_parity", and returns "true". If "is_par" is true,
496 // uses an atomic instruction to set the current threads parity to
497 // "collection_parity", if it is not already. Returns "true" iff the
498 // calling thread does the update, this indicates that the calling thread
499 // has claimed the thread's stack as a root groop in the current
500 // collection.
501 bool claim_oops_do(bool is_par, int collection_parity) {
502 if (!is_par) {
503 _oops_do_parity = collection_parity;
504 return true;
505 } else {
506 return claim_oops_do_par_case(collection_parity);
507 }
508 }
509
510 // Sweeper support
511 void nmethods_do(CodeBlobClosure* cf);
512
513 // jvmtiRedefineClasses support
514 void metadata_handles_do(void f(Metadata*));
515
516 // Used by fast lock support
517 virtual bool is_lock_owned(address adr) const;
518
519 // Check if address is in the stack of the thread (not just for locks).
520 // Warning: the method can only be used on the running thread
521 bool is_in_stack(address adr) const;
522 // Check if address is in the usable part of the stack (excludes protected
523 // guard pages)
524 bool is_in_usable_stack(address adr) const;
525
526 // Sets this thread as starting thread. Returns failure if thread
527 // creation fails due to lack of memory, too many threads etc.
528 bool set_as_starting_thread();
529
530 protected:
531 // OS data associated with the thread
532 OSThread* _osthread; // Platform-specific thread information
533
534 // Thread local resource area for temporary allocation within the VM
535 ResourceArea* _resource_area;
536
537 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
538
539 // Thread local handle area for allocation of handles within the VM
540 HandleArea* _handle_area;
541 GrowableArray<Metadata*>* _metadata_handles;
542
543 // Support for stack overflow handling, get_thread, etc.
544 address _stack_base;
545 size_t _stack_size;
546 uintptr_t _self_raw_id; // used by get_thread (mutable)
547 int _lgrp_id;
548
549 public:
550 // Stack overflow support
551 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
552 void set_stack_base(address base) { _stack_base = base; }
553 size_t stack_size() const { return _stack_size; }
554 void set_stack_size(size_t size) { _stack_size = size; }
555 address stack_end() const { return stack_base() - stack_size(); }
556 void record_stack_base_and_size();
557
558 bool on_local_stack(address adr) const {
559 // QQQ this has knowledge of direction, ought to be a stack method
560 return (_stack_base >= adr && adr >= stack_end());
561 }
562
563 uintptr_t self_raw_id() { return _self_raw_id; }
564 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
565
566 int lgrp_id() const { return _lgrp_id; }
567 void set_lgrp_id(int value) { _lgrp_id = value; }
568
569 // Printing
570 virtual void print_on(outputStream* st) const;
571 void print() const { print_on(tty); }
572 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
573
574 // Debug-only code
575 #ifdef ASSERT
576 private:
577 // Deadlock detection support for Mutex locks. List of locks own by thread.
578 Monitor* _owned_locks;
579 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
580 // thus the friendship
581 friend class Mutex;
582 friend class Monitor;
583
584 public:
585 void print_owned_locks_on(outputStream* st) const;
586 void print_owned_locks() const { print_owned_locks_on(tty); }
587 Monitor* owned_locks() const { return _owned_locks; }
588 bool owns_locks() const { return owned_locks() != NULL; }
589 bool owns_locks_but_compiled_lock() const;
590 int oops_do_parity() const { return _oops_do_parity; }
591
592 // Deadlock detection
593 bool allow_allocation() { return _allow_allocation_count == 0; }
594 ResourceMark* current_resource_mark() { return _current_resource_mark; }
595 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
596 #endif
597
598 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
599
600 private:
601 volatile int _jvmti_env_iteration_count;
602
603 public:
604 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
605 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
606 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
607
608 // Code generation
609 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
610 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
611 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
612
613 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
614 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
615
616 #define TLAB_FIELD_OFFSET(name) \
617 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
618
619 TLAB_FIELD_OFFSET(start)
620 TLAB_FIELD_OFFSET(end)
621 TLAB_FIELD_OFFSET(top)
622 TLAB_FIELD_OFFSET(pf_top)
623 TLAB_FIELD_OFFSET(size) // desired_size
624 TLAB_FIELD_OFFSET(refill_waste_limit)
625 TLAB_FIELD_OFFSET(number_of_refills)
626 TLAB_FIELD_OFFSET(fast_refill_waste)
627 TLAB_FIELD_OFFSET(slow_allocations)
628
629 #undef TLAB_FIELD_OFFSET
630
631 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
632
633 public:
634 volatile intptr_t _Stalled;
635 volatile int _TypeTag;
636 ParkEvent * _ParkEvent; // for synchronized()
637 ParkEvent * _SleepEvent; // for Thread.sleep
638 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
639 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
640 int NativeSyncRecursion; // diagnostic
641
642 volatile int _OnTrap; // Resume-at IP delta
643 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
644 jint _hashStateX; // thread-specific hashCode generator state
645 jint _hashStateY;
646 jint _hashStateZ;
647 void * _schedctl;
648
649
650 volatile jint rng[4]; // RNG for spin loop
651
652 // Low-level leaf-lock primitives used to implement synchronization
653 // and native monitor-mutex infrastructure.
654 // Not for general synchronization use.
655 static void SpinAcquire(volatile int * Lock, const char * Name);
656 static void SpinRelease(volatile int * Lock);
657 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
658 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
659 static void muxRelease(volatile intptr_t * Lock);
660 };
661
662 // Inline implementation of Thread::current()
663 inline Thread* Thread::current() {
664 Thread* current = current_or_null();
665 assert(current != NULL, "Thread::current() called on detached thread");
666 return current;
667 }
668
669 inline Thread* Thread::current_or_null() {
670 #ifndef USE_LIBRARY_BASED_TLS_ONLY
671 return _thr_current;
672 #else
673 return ThreadLocalStorage::thread();
674 #endif
675 }
676
677 inline Thread* Thread::current_or_null_safe() {
678 return ThreadLocalStorage::thread();
679 }
680
681 // Name support for threads. non-JavaThread subclasses with multiple
682 // uniquely named instances should derive from this.
683 class NamedThread: public Thread {
684 friend class VMStructs;
685 enum {
686 max_name_len = 64
687 };
688 private:
689 char* _name;
690 // log JavaThread being processed by oops_do
691 JavaThread* _processed_thread;
692 uint _gc_id; // The current GC id when a thread takes part in GC
693
694 public:
695 NamedThread();
696 ~NamedThread();
697 // May only be called once per thread.
698 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
699 void initialize_named_thread();
700 virtual bool is_Named_thread() const { return true; }
701 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
702 JavaThread *processed_thread() { return _processed_thread; }
703 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
704 virtual void print_on(outputStream* st) const;
705
706 void set_gc_id(uint gc_id) { _gc_id = gc_id; }
707 uint gc_id() { return _gc_id; }
708 };
709
710 // Worker threads are named and have an id of an assigned work.
711 class WorkerThread: public NamedThread {
712 private:
713 uint _id;
714 public:
715 WorkerThread() : _id(0) { }
716 virtual bool is_Worker_thread() const { return true; }
717
718 virtual WorkerThread* as_Worker_thread() const {
719 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
720 return (WorkerThread*) this;
721 }
722
723 void set_id(uint work_id) { _id = work_id; }
724 uint id() const { return _id; }
725 };
726
727 // A single WatcherThread is used for simulating timer interrupts.
728 class WatcherThread: public Thread {
729 friend class VMStructs;
730 public:
731 virtual void run();
732
733 private:
734 static WatcherThread* _watcher_thread;
735
736 static bool _startable;
737 // volatile due to at least one lock-free read
738 volatile static bool _should_terminate;
739
740 os::WatcherThreadCrashProtection* _crash_protection;
741 public:
742 enum SomeConstants {
743 delay_interval = 10 // interrupt delay in milliseconds
744 };
745
746 // Constructor
747 WatcherThread();
748
749 // Tester
750 bool is_Watcher_thread() const { return true; }
751
752 // Printing
753 char* name() const { return (char*)"VM Periodic Task Thread"; }
754 void print_on(outputStream* st) const;
755 void unpark();
756
757 // Returns the single instance of WatcherThread
758 static WatcherThread* watcher_thread() { return _watcher_thread; }
759
760 // Create and start the single instance of WatcherThread, or stop it on shutdown
761 static void start();
762 static void stop();
763 // Only allow start once the VM is sufficiently initialized
764 // Otherwise the first task to enroll will trigger the start
765 static void make_startable();
766
767 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
768 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
769 _crash_protection = crash_protection;
770 }
771
772 bool has_crash_protection() const { return _crash_protection != NULL; }
773 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
774
775 private:
776 int sleep() const;
777 };
778
779
780 class CompilerThread;
781
782 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
783
784 class JavaThread: public Thread {
785 friend class VMStructs;
786 friend class WhiteBox;
787 private:
788 JavaThread* _next; // The next thread in the Threads list
789 oop _threadObj; // The Java level thread object
790
791 #ifdef ASSERT
792 private:
793 int _java_call_counter;
794
795 public:
796 int java_call_counter() { return _java_call_counter; }
797 void inc_java_call_counter() { _java_call_counter++; }
798 void dec_java_call_counter() {
799 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
800 _java_call_counter--;
801 }
802 private: // restore original namespace restriction
803 #endif // ifdef ASSERT
804
805 #ifndef PRODUCT
806 public:
807 enum {
808 jump_ring_buffer_size = 16
809 };
810 private: // restore original namespace restriction
811 #endif
812
813 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
814
815 ThreadFunction _entry_point;
816
817 JNIEnv _jni_environment;
818
819 // Deopt support
820 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
821
822 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
823 // transition out of native
824 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
825 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
826 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
827 // Because deoptimization is lazy we must save jvmti requests to set locals
828 // in compiled frames until we deoptimize and we have an interpreter frame.
829 // This holds the pointer to array (yeah like there might be more than one) of
830 // description of compiled vframes that have locals that need to be updated.
831 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
832
833 // Handshake value for fixing 6243940. We need a place for the i2c
834 // adapter to store the callee Method*. This value is NEVER live
835 // across a gc point so it does NOT have to be gc'd
836 // The handshake is open ended since we can't be certain that it will
837 // be NULLed. This is because we rarely ever see the race and end up
838 // in handle_wrong_method which is the backend of the handshake. See
839 // code in i2c adapters and handle_wrong_method.
840
841 Method* _callee_target;
842
843 // Used to pass back results to the interpreter or generated code running Java code.
844 oop _vm_result; // oop result is GC-preserved
845 Metadata* _vm_result_2; // non-oop result
846
847 // See ReduceInitialCardMarks: this holds the precise space interval of
848 // the most recent slow path allocation for which compiled code has
849 // elided card-marks for performance along the fast-path.
850 MemRegion _deferred_card_mark;
851
852 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
853 // allocated during deoptimization
854 // and by JNI_MonitorEnter/Exit
855
856 // Async. requests support
857 enum AsyncRequests {
858 _no_async_condition = 0,
859 _async_exception,
860 _async_unsafe_access_error
861 };
862 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
863 oop _pending_async_exception;
864
865 // Safepoint support
866 public: // Expose _thread_state for SafeFetchInt()
867 volatile JavaThreadState _thread_state;
868 private:
869 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
870 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
871
872 // JavaThread termination support
873 enum TerminatedTypes {
874 _not_terminated = 0xDEAD - 2,
875 _thread_exiting, // JavaThread::exit() has been called for this thread
876 _thread_terminated, // JavaThread is removed from thread list
877 _vm_exited // JavaThread is still executing native code, but VM is terminated
878 // only VM_Exit can set _vm_exited
879 };
880
881 // In general a JavaThread's _terminated field transitions as follows:
882 //
883 // _not_terminated => _thread_exiting => _thread_terminated
884 //
885 // _vm_exited is a special value to cover the case of a JavaThread
886 // executing native code after the VM itself is terminated.
887 volatile TerminatedTypes _terminated;
888 // suspend/resume support
889 volatile bool _suspend_equivalent; // Suspend equivalent condition
890 jint _in_deopt_handler; // count of deoptimization
891 // handlers thread is in
892 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
893 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
894 // never locked) when throwing an exception. Used by interpreter only.
895
896 // JNI attach states:
897 enum JNIAttachStates {
898 _not_attaching_via_jni = 1, // thread is not attaching via JNI
899 _attaching_via_jni, // thread is attaching via JNI
900 _attached_via_jni // thread has attached via JNI
901 };
902
903 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
904 // A native thread that is attaching via JNI starts with a value
905 // of _attaching_via_jni and transitions to _attached_via_jni.
906 volatile JNIAttachStates _jni_attach_state;
907
908 public:
909 // State of the stack guard pages for this thread.
910 enum StackGuardState {
911 stack_guard_unused, // not needed
912 stack_guard_reserved_disabled,
913 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow
914 stack_guard_enabled // enabled
915 };
916
917 private:
918
919 #if INCLUDE_JVMCI
920 // The _pending_* fields below are used to communicate extra information
921 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
922
923 // Communicates the DeoptReason and DeoptAction of the uncommon trap
924 int _pending_deoptimization;
925
926 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
927 // before the monitor has been acquired.
928 bool _pending_monitorenter;
929
930 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
931 bool _pending_transfer_to_interpreter;
932
933 // An object that JVMCI compiled code can use to further describe and
934 // uniquely identify the speculative optimization guarded by the uncommon trap
935 oop _pending_failed_speculation;
936
937 // These fields are mutually exclusive in terms of live ranges.
938 union {
939 // Communicates the pc at which the most recent implicit exception occurred
940 // from the signal handler to a deoptimization stub.
941 address _implicit_exception_pc;
942
943 // Communicates an alternative call target to an i2c stub from a JavaCall .
944 address _alternate_call_target;
945 } _jvmci;
946
947 // Support for high precision, thread sensitive counters in JVMCI compiled code.
948 jlong* _jvmci_counters;
949
950 public:
951 static jlong* _jvmci_old_thread_counters;
952 static void collect_counters(typeArrayOop array);
953 private:
954 #endif // INCLUDE_JVMCI
955
956 StackGuardState _stack_guard_state;
957
958 // Precompute the limit of the stack as used in stack overflow checks.
959 // We load it from here to simplify the stack overflow check in assembly.
960 address _stack_overflow_limit;
961 address _reserved_stack_activation;
962
963 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
964 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
965 // code)
966 volatile oop _exception_oop; // Exception thrown in compiled code
967 volatile address _exception_pc; // PC where exception happened
968 volatile address _exception_handler_pc; // PC for handler of exception
969 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
970
971 private:
972 // support for JNI critical regions
973 jint _jni_active_critical; // count of entries into JNI critical region
974
975 // Checked JNI: function name requires exception check
976 char* _pending_jni_exception_check_fn;
977
978 // For deadlock detection.
979 int _depth_first_number;
980
981 // JVMTI PopFrame support
982 // This is set to popframe_pending to signal that top Java frame should be popped immediately
983 int _popframe_condition;
984
985 // If reallocation of scalar replaced objects fails, we throw OOM
986 // and during exception propagation, pop the top
987 // _frames_to_pop_failed_realloc frames, the ones that reference
988 // failed reallocations.
989 int _frames_to_pop_failed_realloc;
990
991 #ifndef PRODUCT
992 int _jmp_ring_index;
993 struct {
994 // We use intptr_t instead of address so debugger doesn't try and display strings
995 intptr_t _target;
996 intptr_t _instruction;
997 const char* _file;
998 int _line;
999 } _jmp_ring[jump_ring_buffer_size];
1000 #endif // PRODUCT
1001
1002 #if INCLUDE_ALL_GCS
1003 // Support for G1 barriers
1004
1005 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier.
1006 // Set of all such queues.
1007 static SATBMarkQueueSet _satb_mark_queue_set;
1008
1009 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
1010 // Set of all such queues.
1011 static DirtyCardQueueSet _dirty_card_queue_set;
1012
1013 void flush_barrier_queues();
1014 #endif // INCLUDE_ALL_GCS
1015
1016 friend class VMThread;
1017 friend class ThreadWaitTransition;
1018 friend class VM_Exit;
1019
1020 void initialize(); // Initialized the instance variables
1021
1022 public:
1023 // Constructor
1024 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1025 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1026 ~JavaThread();
1027
1028 #ifdef ASSERT
1029 // verify this JavaThread hasn't be published in the Threads::list yet
1030 void verify_not_published();
1031 #endif
1032
1033 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1034 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1035 _jni_environment.functions = functionTable;
1036 }
1037 struct JNINativeInterface_* get_jni_functions() {
1038 return (struct JNINativeInterface_ *)_jni_environment.functions;
1039 }
1040
1041 // This function is called at thread creation to allow
1042 // platform specific thread variables to be initialized.
1043 void cache_global_variables();
1044
1045 // Executes Shutdown.shutdown()
1046 void invoke_shutdown_hooks();
1047
1048 // Cleanup on thread exit
1049 enum ExitType {
1050 normal_exit,
1051 jni_detach
1052 };
1053 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1054
1055 void cleanup_failed_attach_current_thread();
1056
1057 // Testers
1058 virtual bool is_Java_thread() const { return true; }
1059 virtual bool can_call_java() const { return true; }
1060
1061 // Thread chain operations
1062 JavaThread* next() const { return _next; }
1063 void set_next(JavaThread* p) { _next = p; }
1064
1065 // Thread oop. threadObj() can be NULL for initial JavaThread
1066 // (or for threads attached via JNI)
1067 oop threadObj() const { return _threadObj; }
1068 void set_threadObj(oop p) { _threadObj = p; }
1069
1070 ThreadPriority java_priority() const; // Read from threadObj()
1071
1072 // Prepare thread and add to priority queue. If a priority is
1073 // not specified, use the priority of the thread object. Threads_lock
1074 // must be held while this function is called.
1075 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1076 void prepare_ext();
1077
1078 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1079 address saved_exception_pc() { return _saved_exception_pc; }
1080
1081
1082 ThreadFunction entry_point() const { return _entry_point; }
1083
1084 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1085 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1086
1087 // Last frame anchor routines
1088
1089 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1090
1091 // last_Java_sp
1092 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1093 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1094
1095 // last_Java_pc
1096
1097 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1098
1099 // Safepoint support
1100 #if !(defined(PPC64) || defined(AARCH64))
1101 JavaThreadState thread_state() const { return _thread_state; }
1102 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1103 #else
1104 // Use membars when accessing volatile _thread_state. See
1105 // Threads::create_vm() for size checks.
1106 inline JavaThreadState thread_state() const;
1107 inline void set_thread_state(JavaThreadState s);
1108 #endif
1109 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1110 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1111 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1112
1113 // thread has called JavaThread::exit() or is terminated
1114 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1115 // thread is terminated (no longer on the threads list); we compare
1116 // against the two non-terminated values so that a freed JavaThread
1117 // will also be considered terminated.
1118 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1119 void set_terminated(TerminatedTypes t) { _terminated = t; }
1120 // special for Threads::remove() which is static:
1121 void set_terminated_value() { _terminated = _thread_terminated; }
1122 void block_if_vm_exited();
1123
1124 bool doing_unsafe_access() { return _doing_unsafe_access; }
1125 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1126
1127 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1128 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1129
1130 // Suspend/resume support for JavaThread
1131 private:
1132 inline void set_ext_suspended();
1133 inline void clear_ext_suspended();
1134
1135 public:
1136 void java_suspend();
1137 void java_resume();
1138 int java_suspend_self();
1139
1140 void check_and_wait_while_suspended() {
1141 assert(JavaThread::current() == this, "sanity check");
1142
1143 bool do_self_suspend;
1144 do {
1145 // were we externally suspended while we were waiting?
1146 do_self_suspend = handle_special_suspend_equivalent_condition();
1147 if (do_self_suspend) {
1148 // don't surprise the thread that suspended us by returning
1149 java_suspend_self();
1150 set_suspend_equivalent();
1151 }
1152 } while (do_self_suspend);
1153 }
1154 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1155 // Check for async exception in addition to safepoint and suspend request.
1156 static void check_special_condition_for_native_trans(JavaThread *thread);
1157
1158 // Same as check_special_condition_for_native_trans but finishes the
1159 // transition into thread_in_Java mode so that it can potentially
1160 // block.
1161 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1162
1163 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1164 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1165 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1166 // Warning: is_ext_suspend_completed() may temporarily drop the
1167 // SR_lock to allow the thread to reach a stable thread state if
1168 // it is currently in a transient thread state.
1169 return is_ext_suspend_completed(false /* !called_by_wait */,
1170 SuspendRetryDelay, bits);
1171 }
1172
1173 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1174 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1175 // passed as the count and delay parameters. Experiments with specific
1176 // calls to wait_for_ext_suspend_completion() can be done by passing
1177 // other values in the code. Experiments with all calls can be done
1178 // via the appropriate -XX options.
1179 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1180
1181 inline void set_external_suspend();
1182 inline void clear_external_suspend();
1183
1184 inline void set_deopt_suspend();
1185 inline void clear_deopt_suspend();
1186 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1187
1188 bool is_external_suspend() const {
1189 return (_suspend_flags & _external_suspend) != 0;
1190 }
1191 // Whenever a thread transitions from native to vm/java it must suspend
1192 // if external|deopt suspend is present.
1193 bool is_suspend_after_native() const {
1194 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1195 }
1196
1197 // external suspend request is completed
1198 bool is_ext_suspended() const {
1199 return (_suspend_flags & _ext_suspended) != 0;
1200 }
1201
1202 bool is_external_suspend_with_lock() const {
1203 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1204 return is_external_suspend();
1205 }
1206
1207 // Special method to handle a pending external suspend request
1208 // when a suspend equivalent condition lifts.
1209 bool handle_special_suspend_equivalent_condition() {
1210 assert(is_suspend_equivalent(),
1211 "should only be called in a suspend equivalence condition");
1212 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1213 bool ret = is_external_suspend();
1214 if (!ret) {
1215 // not about to self-suspend so clear suspend equivalence
1216 clear_suspend_equivalent();
1217 }
1218 // implied else:
1219 // We have a pending external suspend request so we leave the
1220 // suspend_equivalent flag set until java_suspend_self() sets
1221 // the ext_suspended flag and clears the suspend_equivalent
1222 // flag. This insures that wait_for_ext_suspend_completion()
1223 // will return consistent values.
1224 return ret;
1225 }
1226
1227 // utility methods to see if we are doing some kind of suspension
1228 bool is_being_ext_suspended() const {
1229 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1230 return is_ext_suspended() || is_external_suspend();
1231 }
1232
1233 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1234
1235 void set_suspend_equivalent() { _suspend_equivalent = true; }
1236 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1237
1238 // Thread.stop support
1239 void send_thread_stop(oop throwable);
1240 AsyncRequests clear_special_runtime_exit_condition() {
1241 AsyncRequests x = _special_runtime_exit_condition;
1242 _special_runtime_exit_condition = _no_async_condition;
1243 return x;
1244 }
1245
1246 // Are any async conditions present?
1247 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1248
1249 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1250
1251 // these next two are also used for self-suspension and async exception support
1252 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1253
1254 // Return true if JavaThread has an asynchronous condition or
1255 // if external suspension is requested.
1256 bool has_special_runtime_exit_condition() {
1257 // We call is_external_suspend() last since external suspend should
1258 // be less common. Because we don't use is_external_suspend_with_lock
1259 // it is possible that we won't see an asynchronous external suspend
1260 // request that has just gotten started, i.e., SR_lock grabbed but
1261 // _external_suspend field change either not made yet or not visible
1262 // yet. However, this is okay because the request is asynchronous and
1263 // we will see the new flag value the next time through. It's also
1264 // possible that the external suspend request is dropped after
1265 // we have checked is_external_suspend(), we will recheck its value
1266 // under SR_lock in java_suspend_self().
1267 return (_special_runtime_exit_condition != _no_async_condition) ||
1268 is_external_suspend() || is_deopt_suspend();
1269 }
1270
1271 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1272
1273 inline void set_pending_async_exception(oop e);
1274
1275 // Fast-locking support
1276 bool is_lock_owned(address adr) const;
1277
1278 // Accessors for vframe array top
1279 // The linked list of vframe arrays are sorted on sp. This means when we
1280 // unpack the head must contain the vframe array to unpack.
1281 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1282 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1283
1284 // Side structure for deferring update of java frame locals until deopt occurs
1285 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1286 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1287
1288 // These only really exist to make debugging deopt problems simpler
1289
1290 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1291 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1292
1293 // The special resourceMark used during deoptimization
1294
1295 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1296 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1297
1298 intptr_t* must_deopt_id() { return _must_deopt_id; }
1299 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1300 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1301
1302 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1303 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1304
1305 Method* callee_target() const { return _callee_target; }
1306 void set_callee_target (Method* x) { _callee_target = x; }
1307
1308 // Oop results of vm runtime calls
1309 oop vm_result() const { return _vm_result; }
1310 void set_vm_result (oop x) { _vm_result = x; }
1311
1312 Metadata* vm_result_2() const { return _vm_result_2; }
1313 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1314
1315 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1316 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1317
1318 #if INCLUDE_JVMCI
1319 int pending_deoptimization() const { return _pending_deoptimization; }
1320 oop pending_failed_speculation() const { return _pending_failed_speculation; }
1321 bool has_pending_monitorenter() const { return _pending_monitorenter; }
1322 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
1323 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
1324 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; }
1325 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
1326 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
1327 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
1328 #endif // INCLUDE_JVMCI
1329
1330 // Exception handling for compiled methods
1331 oop exception_oop() const { return _exception_oop; }
1332 address exception_pc() const { return _exception_pc; }
1333 address exception_handler_pc() const { return _exception_handler_pc; }
1334 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1335
1336 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1337 void set_exception_pc(address a) { _exception_pc = a; }
1338 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1339 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1340
1341 void clear_exception_oop_and_pc() {
1342 set_exception_oop(NULL);
1343 set_exception_pc(NULL);
1344 }
1345
1346 // Stack overflow support
1347 //
1348 // (small addresses)
1349 //
1350 // -- <-- stack_end() ---
1351 // | |
1352 // | red pages |
1353 // | |
1354 // -- <-- stack_red_zone_base() |
1355 // | |
1356 // | guard
1357 // | yellow pages zone
1358 // | |
1359 // | |
1360 // -- <-- stack_yellow_zone_base() |
1361 // | |
1362 // | |
1363 // | reserved pages |
1364 // | |
1365 // -- <-- stack_reserved_zone_base() --- ---
1366 // /|\ shadow
1367 // | zone
1368 // \|/ size
1369 // some untouched memory --- <-- stack_overflow_limit()
1370 //
1371 //
1372 // --
1373 // |
1374 // | shadow zone
1375 // |
1376 // --
1377 // x frame n
1378 // --
1379 // x frame n-1
1380 // x
1381 // --
1382 // ...
1383 //
1384 // --
1385 // x frame 0
1386 // -- <-- stack_base()
1387 //
1388 // (large addresses)
1389 //
1390
1391 private:
1392 // These values are derived from flags StackRedPages, StackYellowPages,
1393 // StackReservedPages and StackShadowPages. The zone size is determined
1394 // ergonomically if page_size > 4K.
1395 static size_t _stack_red_zone_size;
1396 static size_t _stack_yellow_zone_size;
1397 static size_t _stack_reserved_zone_size;
1398 static size_t _stack_shadow_zone_size;
1399 public:
1400 inline size_t stack_available(address cur_sp);
1401
1402 static size_t stack_red_zone_size() {
1403 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized.");
1404 return _stack_red_zone_size;
1405 }
1406 static void set_stack_red_zone_size(size_t s) {
1407 assert(is_size_aligned(s, os::vm_page_size()),
1408 "We can not protect if the red zone size is not page aligned.");
1409 assert(_stack_red_zone_size == 0, "This should be called only once.");
1410 _stack_red_zone_size = s;
1411 }
1412 address stack_red_zone_base() {
1413 return (address)(stack_end() + stack_red_zone_size());
1414 }
1415 bool in_stack_red_zone(address a) {
1416 return a <= stack_red_zone_base() && a >= stack_end();
1417 }
1418
1419 static size_t stack_yellow_zone_size() {
1420 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized.");
1421 return _stack_yellow_zone_size;
1422 }
1423 static void set_stack_yellow_zone_size(size_t s) {
1424 assert(is_size_aligned(s, os::vm_page_size()),
1425 "We can not protect if the yellow zone size is not page aligned.");
1426 assert(_stack_yellow_zone_size == 0, "This should be called only once.");
1427 _stack_yellow_zone_size = s;
1428 }
1429
1430 static size_t stack_reserved_zone_size() {
1431 // _stack_reserved_zone_size may be 0. This indicates the feature is off.
1432 return _stack_reserved_zone_size;
1433 }
1434 static void set_stack_reserved_zone_size(size_t s) {
1435 assert(is_size_aligned(s, os::vm_page_size()),
1436 "We can not protect if the reserved zone size is not page aligned.");
1437 assert(_stack_reserved_zone_size == 0, "This should be called only once.");
1438 _stack_reserved_zone_size = s;
1439 }
1440 address stack_reserved_zone_base() {
1441 return (address)(stack_end() +
1442 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size()));
1443 }
1444 bool in_stack_reserved_zone(address a) {
1445 return (a <= stack_reserved_zone_base()) &&
1446 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size()));
1447 }
1448
1449 static size_t stack_yellow_reserved_zone_size() {
1450 return _stack_yellow_zone_size + _stack_reserved_zone_size;
1451 }
1452 bool in_stack_yellow_reserved_zone(address a) {
1453 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base());
1454 }
1455
1456 // Size of red + yellow + reserved zones.
1457 static size_t stack_guard_zone_size() {
1458 return stack_red_zone_size() + stack_yellow_reserved_zone_size();
1459 }
1460
1461 static size_t stack_shadow_zone_size() {
1462 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized.");
1463 return _stack_shadow_zone_size;
1464 }
1465 static void set_stack_shadow_zone_size(size_t s) {
1466 // The shadow area is not allocated or protected, so
1467 // it needs not be page aligned.
1468 // But the stack bang currently assumes that it is a
1469 // multiple of page size. This guarantees that the bang
1470 // loop touches all pages in the shadow zone.
1471 // This can be guaranteed differently, as well. E.g., if
1472 // the page size is a multiple of 4K, banging in 4K steps
1473 // suffices to touch all pages. (Some pages are banged
1474 // several times, though.)
1475 assert(is_size_aligned(s, os::vm_page_size()),
1476 "Stack bang assumes multiple of page size.");
1477 assert(_stack_shadow_zone_size == 0, "This should be called only once.");
1478 _stack_shadow_zone_size = s;
1479 }
1480
1481 void create_stack_guard_pages();
1482 void remove_stack_guard_pages();
1483
1484 void enable_stack_reserved_zone();
1485 void disable_stack_reserved_zone();
1486 void enable_stack_yellow_reserved_zone();
1487 void disable_stack_yellow_reserved_zone();
1488 void enable_stack_red_zone();
1489 void disable_stack_red_zone();
1490
1491 inline bool stack_guard_zone_unused();
1492 inline bool stack_yellow_reserved_zone_disabled();
1493 inline bool stack_reserved_zone_disabled();
1494 inline bool stack_guards_enabled();
1495
1496 address reserved_stack_activation() const { return _reserved_stack_activation; }
1497 void set_reserved_stack_activation(address addr) {
1498 assert(_reserved_stack_activation == stack_base()
1499 || _reserved_stack_activation == NULL
1500 || addr == stack_base(), "Must not be set twice");
1501 _reserved_stack_activation = addr;
1502 }
1503
1504 // Attempt to reguard the stack after a stack overflow may have occurred.
1505 // Returns true if (a) guard pages are not needed on this thread, (b) the
1506 // pages are already guarded, or (c) the pages were successfully reguarded.
1507 // Returns false if there is not enough stack space to reguard the pages, in
1508 // which case the caller should unwind a frame and try again. The argument
1509 // should be the caller's (approximate) sp.
1510 bool reguard_stack(address cur_sp);
1511 // Similar to above but see if current stackpoint is out of the guard area
1512 // and reguard if possible.
1513 bool reguard_stack(void);
1514
1515 address stack_overflow_limit() { return _stack_overflow_limit; }
1516 void set_stack_overflow_limit() {
1517 _stack_overflow_limit = stack_end() +
1518 (JavaThread::stack_guard_zone_size() +
1519 JavaThread::stack_shadow_zone_size());
1520 }
1521
1522 // Misc. accessors/mutators
1523 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1524 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1525 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1526
1527 #ifndef PRODUCT
1528 void record_jump(address target, address instr, const char* file, int line);
1529 #endif // PRODUCT
1530
1531 // For assembly stub generation
1532 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1533 #ifndef PRODUCT
1534 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1535 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1536 #endif // PRODUCT
1537 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1538 static ByteSize last_Java_sp_offset() {
1539 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1540 }
1541 static ByteSize last_Java_pc_offset() {
1542 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1543 }
1544 static ByteSize frame_anchor_offset() {
1545 return byte_offset_of(JavaThread, _anchor);
1546 }
1547 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1548 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1549 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1550 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1551 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1552 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1553 #if INCLUDE_JVMCI
1554 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
1555 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
1556 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); }
1557 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
1558 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
1559 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
1560 #endif // INCLUDE_JVMCI
1561 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1562 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1563 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1564 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1565 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1566 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1567 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); }
1568 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1569
1570 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1571 static ByteSize should_post_on_exceptions_flag_offset() {
1572 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1573 }
1574
1575 #if INCLUDE_ALL_GCS
1576 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1577 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1578 #endif // INCLUDE_ALL_GCS
1579
1580 // Returns the jni environment for this thread
1581 JNIEnv* jni_environment() { return &_jni_environment; }
1582
1583 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1584 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1585 // Only return NULL if thread is off the thread list; starting to
1586 // exit should not return NULL.
1587 if (thread_from_jni_env->is_terminated()) {
1588 thread_from_jni_env->block_if_vm_exited();
1589 return NULL;
1590 } else {
1591 return thread_from_jni_env;
1592 }
1593 }
1594
1595 // JNI critical regions. These can nest.
1596 bool in_critical() { return _jni_active_critical > 0; }
1597 bool in_last_critical() { return _jni_active_critical == 1; }
1598 void enter_critical() {
1599 assert(Thread::current() == this ||
1600 (Thread::current()->is_VM_thread() &&
1601 SafepointSynchronize::is_synchronizing()),
1602 "this must be current thread or synchronizing");
1603 _jni_active_critical++;
1604 }
1605 void exit_critical() {
1606 assert(Thread::current() == this, "this must be current thread");
1607 _jni_active_critical--;
1608 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1609 }
1610
1611 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1612 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1613 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1614 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1615 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1616
1617 // For deadlock detection
1618 int depth_first_number() { return _depth_first_number; }
1619 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1620
1621 private:
1622 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1623
1624 public:
1625 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1626 void add_monitor_chunk(MonitorChunk* chunk);
1627 void remove_monitor_chunk(MonitorChunk* chunk);
1628 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1629 void inc_in_deopt_handler() { _in_deopt_handler++; }
1630 void dec_in_deopt_handler() {
1631 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1632 if (_in_deopt_handler > 0) { // robustness
1633 _in_deopt_handler--;
1634 }
1635 }
1636
1637 private:
1638 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1639
1640 public:
1641
1642 // Frame iteration; calls the function f for all frames on the stack
1643 void frames_do(void f(frame*, const RegisterMap*));
1644
1645 // Memory operations
1646 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1647
1648 // Sweeper operations
1649 void nmethods_do(CodeBlobClosure* cf);
1650
1651 // RedefineClasses Support
1652 void metadata_do(void f(Metadata*));
1653
1654 // Misc. operations
1655 char* name() const { return (char*)get_thread_name(); }
1656 void print_on(outputStream* st) const;
1657 void print_value();
1658 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1659 void print_thread_state() const PRODUCT_RETURN;
1660 void print_on_error(outputStream* st, char* buf, int buflen) const;
1661 void verify();
1662 const char* get_thread_name() const;
1663 private:
1664 // factor out low-level mechanics for use in both normal and error cases
1665 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1666 public:
1667 const char* get_threadgroup_name() const;
1668 const char* get_parent_name() const;
1669
1670 // Accessing frames
1671 frame last_frame() {
1672 _anchor.make_walkable(this);
1673 return pd_last_frame();
1674 }
1675 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1676
1677 // Returns method at 'depth' java or native frames down the stack
1678 // Used for security checks
1679 Klass* security_get_caller_class(int depth);
1680
1681 // Print stack trace in external format
1682 void print_stack_on(outputStream* st);
1683 void print_stack() { print_stack_on(tty); }
1684
1685 // Print stack traces in various internal formats
1686 void trace_stack() PRODUCT_RETURN;
1687 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1688 void trace_frames() PRODUCT_RETURN;
1689 void trace_oops() PRODUCT_RETURN;
1690
1691 // Print an annotated view of the stack frames
1692 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1693 void validate_frame_layout() {
1694 print_frame_layout(0, true);
1695 }
1696
1697 // Returns the number of stack frames on the stack
1698 int depth() const;
1699
1700 // Function for testing deoptimization
1701 void deoptimize();
1702 void make_zombies();
1703
1704 void deoptimized_wrt_marked_nmethods();
1705
1706 // Profiling operation (see fprofile.cpp)
1707 public:
1708 bool profile_last_Java_frame(frame* fr);
1709
1710 private:
1711 ThreadProfiler* _thread_profiler;
1712 private:
1713 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1714 friend class FlatProfilerTask; // uses get_thread_profiler.
1715 friend class ThreadProfilerMark; // uses get_thread_profiler.
1716 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1717 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1718 ThreadProfiler* result = _thread_profiler;
1719 _thread_profiler = tp;
1720 return result;
1721 }
1722
1723 public:
1724 // Returns the running thread as a JavaThread
1725 static inline JavaThread* current();
1726
1727 // Returns the active Java thread. Do not use this if you know you are calling
1728 // from a JavaThread, as it's slower than JavaThread::current. If called from
1729 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1730 // operation. You may not want that either.
1731 static JavaThread* active();
1732
1733 inline CompilerThread* as_CompilerThread();
1734
1735 public:
1736 virtual void run();
1737 void thread_main_inner();
1738
1739 private:
1740 // PRIVILEGED STACK
1741 PrivilegedElement* _privileged_stack_top;
1742 GrowableArray<oop>* _array_for_gc;
1743 public:
1744
1745 // Returns the privileged_stack information.
1746 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1747 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1748 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1749
1750 public:
1751 // Thread local information maintained by JVMTI.
1752 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1753 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1754 // getter is used to get this JavaThread's JvmtiThreadState if it has
1755 // one which means NULL can be returned. JvmtiThreadState::state_for()
1756 // is used to get the specified JavaThread's JvmtiThreadState if it has
1757 // one or it allocates a new JvmtiThreadState for the JavaThread and
1758 // returns it. JvmtiThreadState::state_for() will return NULL only if
1759 // the specified JavaThread is exiting.
1760 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1761 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1762 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1763 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1764
1765 // JVMTI PopFrame support
1766 // Setting and clearing popframe_condition
1767 // All of these enumerated values are bits. popframe_pending
1768 // indicates that a PopFrame() has been requested and not yet been
1769 // completed. popframe_processing indicates that that PopFrame() is in
1770 // the process of being completed. popframe_force_deopt_reexecution_bit
1771 // indicates that special handling is required when returning to a
1772 // deoptimized caller.
1773 enum PopCondition {
1774 popframe_inactive = 0x00,
1775 popframe_pending_bit = 0x01,
1776 popframe_processing_bit = 0x02,
1777 popframe_force_deopt_reexecution_bit = 0x04
1778 };
1779 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1780 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1781 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1782 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1783 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1784 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1785 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1786 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1787 #ifdef CC_INTERP
1788 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1789 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1790 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1791 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1792 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1793 #endif
1794
1795 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1796 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1797 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1798
1799 private:
1800 // Saved incoming arguments to popped frame.
1801 // Used only when popped interpreted frame returns to deoptimized frame.
1802 void* _popframe_preserved_args;
1803 int _popframe_preserved_args_size;
1804
1805 public:
1806 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1807 void* popframe_preserved_args();
1808 ByteSize popframe_preserved_args_size();
1809 WordSize popframe_preserved_args_size_in_words();
1810 void popframe_free_preserved_args();
1811
1812
1813 private:
1814 JvmtiThreadState *_jvmti_thread_state;
1815 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1816
1817 // Used by the interpreter in fullspeed mode for frame pop, method
1818 // entry, method exit and single stepping support. This field is
1819 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1820 // It can be set to zero asynchronously (i.e., without a VM operation
1821 // or a lock) so we have to be very careful.
1822 int _interp_only_mode;
1823
1824 public:
1825 // used by the interpreter for fullspeed debugging support (see above)
1826 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1827 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1828 int get_interp_only_mode() { return _interp_only_mode; }
1829 void increment_interp_only_mode() { ++_interp_only_mode; }
1830 void decrement_interp_only_mode() { --_interp_only_mode; }
1831
1832 // support for cached flag that indicates whether exceptions need to be posted for this thread
1833 // if this is false, we can avoid deoptimizing when events are thrown
1834 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1835 private:
1836 int _should_post_on_exceptions_flag;
1837
1838 public:
1839 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1840 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1841
1842 private:
1843 ThreadStatistics *_thread_stat;
1844
1845 public:
1846 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1847
1848 // Return a blocker object for which this thread is blocked parking.
1849 oop current_park_blocker();
1850
1851 private:
1852 static size_t _stack_size_at_create;
1853
1854 public:
1855 static inline size_t stack_size_at_create(void) {
1856 return _stack_size_at_create;
1857 }
1858 static inline void set_stack_size_at_create(size_t value) {
1859 _stack_size_at_create = value;
1860 }
1861
1862 #if INCLUDE_ALL_GCS
1863 // SATB marking queue support
1864 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; }
1865 static SATBMarkQueueSet& satb_mark_queue_set() {
1866 return _satb_mark_queue_set;
1867 }
1868
1869 // Dirty card queue support
1870 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1871 static DirtyCardQueueSet& dirty_card_queue_set() {
1872 return _dirty_card_queue_set;
1873 }
1874 #endif // INCLUDE_ALL_GCS
1875
1876 // This method initializes the SATB and dirty card queues before a
1877 // JavaThread is added to the Java thread list. Right now, we don't
1878 // have to do anything to the dirty card queue (it should have been
1879 // activated when the thread was created), but we have to activate
1880 // the SATB queue if the thread is created while a marking cycle is
1881 // in progress. The activation / de-activation of the SATB queues at
1882 // the beginning / end of a marking cycle is done during safepoints
1883 // so we have to make sure this method is called outside one to be
1884 // able to safely read the active field of the SATB queue set. Right
1885 // now, it is called just before the thread is added to the Java
1886 // thread list in the Threads::add() method. That method is holding
1887 // the Threads_lock which ensures we are outside a safepoint. We
1888 // cannot do the obvious and set the active field of the SATB queue
1889 // when the thread is created given that, in some cases, safepoints
1890 // might happen between the JavaThread constructor being called and the
1891 // thread being added to the Java thread list (an example of this is
1892 // when the structure for the DestroyJavaVM thread is created).
1893 #if INCLUDE_ALL_GCS
1894 void initialize_queues();
1895 #else // INCLUDE_ALL_GCS
1896 void initialize_queues() { }
1897 #endif // INCLUDE_ALL_GCS
1898
1899 // Machine dependent stuff
1900 #ifdef TARGET_OS_ARCH_linux_x86
1901 # include "thread_linux_x86.hpp"
1902 #endif
1903 #ifdef TARGET_OS_ARCH_linux_sparc
1904 # include "thread_linux_sparc.hpp"
1905 #endif
1906 #ifdef TARGET_OS_ARCH_linux_zero
1907 # include "thread_linux_zero.hpp"
1908 #endif
1909 #ifdef TARGET_OS_ARCH_solaris_x86
1910 # include "thread_solaris_x86.hpp"
1911 #endif
1912 #ifdef TARGET_OS_ARCH_solaris_sparc
1913 # include "thread_solaris_sparc.hpp"
1914 #endif
1915 #ifdef TARGET_OS_ARCH_windows_x86
1916 # include "thread_windows_x86.hpp"
1917 #endif
1918 #ifdef TARGET_OS_ARCH_linux_arm
1919 # include "thread_linux_arm.hpp"
1920 #endif
1921 #ifdef TARGET_OS_ARCH_linux_ppc
1922 # include "thread_linux_ppc.hpp"
1923 #endif
1924 #ifdef TARGET_OS_ARCH_linux_aarch64
1925 # include "thread_linux_aarch64.hpp"
1926 #endif
1927 #ifdef TARGET_OS_ARCH_aix_ppc
1928 # include "thread_aix_ppc.hpp"
1929 #endif
1930 #ifdef TARGET_OS_ARCH_bsd_x86
1931 # include "thread_bsd_x86.hpp"
1932 #endif
1933 #ifdef TARGET_OS_ARCH_bsd_zero
1934 # include "thread_bsd_zero.hpp"
1935 #endif
1936
1937
1938 public:
1939 void set_blocked_on_compilation(bool value) {
1940 _blocked_on_compilation = value;
1941 }
1942
1943 bool blocked_on_compilation() {
1944 return _blocked_on_compilation;
1945 }
1946 protected:
1947 bool _blocked_on_compilation;
1948
1949
1950 // JSR166 per-thread parker
1951 private:
1952 Parker* _parker;
1953 public:
1954 Parker* parker() { return _parker; }
1955
1956 // Biased locking support
1957 private:
1958 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1959 public:
1960 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1961 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1962
1963 // clearing/querying jni attach status
1964 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1965 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1966 inline void set_done_attaching_via_jni();
1967 };
1968
1969 // Inline implementation of JavaThread::current
1970 inline JavaThread* JavaThread::current() {
1971 Thread* thread = Thread::current();
1972 assert(thread->is_Java_thread(), "just checking");
1973 return (JavaThread*)thread;
1974 }
1975
1976 inline CompilerThread* JavaThread::as_CompilerThread() {
1977 assert(is_Compiler_thread(), "just checking");
1978 return (CompilerThread*)this;
1979 }
1980
1981 // Dedicated thread to sweep the code cache
1982 class CodeCacheSweeperThread : public JavaThread {
1983 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1984 public:
1985 CodeCacheSweeperThread();
1986 // Track the nmethod currently being scanned by the sweeper
1987 void set_scanned_nmethod(nmethod* nm) {
1988 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1989 _scanned_nmethod = nm;
1990 }
1991
1992 // Hide sweeper thread from external view.
1993 bool is_hidden_from_external_view() const { return true; }
1994
1995 bool is_Code_cache_sweeper_thread() const { return true; }
1996 // GC support
1997 // Apply "f->do_oop" to all root oops in "this".
1998 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1999 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
2000 };
2001
2002 // A thread used for Compilation.
2003 class CompilerThread : public JavaThread {
2004 friend class VMStructs;
2005 private:
2006 CompilerCounters* _counters;
2007
2008 ciEnv* _env;
2009 CompileLog* _log;
2010 CompileTask* _task;
2011 CompileQueue* _queue;
2012 BufferBlob* _buffer_blob;
2013
2014 AbstractCompiler* _compiler;
2015
2016 public:
2017
2018 static CompilerThread* current();
2019
2020 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
2021
2022 bool is_Compiler_thread() const { return true; }
2023
2024 virtual bool can_call_java() const;
2025
2026 // Hide native compiler threads from external view.
2027 bool is_hidden_from_external_view() const { return !can_call_java(); }
2028
2029 void set_compiler(AbstractCompiler* c) { _compiler = c; }
2030 AbstractCompiler* compiler() const { return _compiler; }
2031
2032 CompileQueue* queue() const { return _queue; }
2033 CompilerCounters* counters() const { return _counters; }
2034
2035 // Get/set the thread's compilation environment.
2036 ciEnv* env() { return _env; }
2037 void set_env(ciEnv* env) { _env = env; }
2038
2039 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
2040 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
2041
2042 // Get/set the thread's logging information
2043 CompileLog* log() { return _log; }
2044 void init_log(CompileLog* log) {
2045 // Set once, for good.
2046 assert(_log == NULL, "set only once");
2047 _log = log;
2048 }
2049
2050 #ifndef PRODUCT
2051 private:
2052 IdealGraphPrinter *_ideal_graph_printer;
2053 public:
2054 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
2055 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
2056 #endif
2057
2058 // Get/set the thread's current task
2059 CompileTask* task() { return _task; }
2060 void set_task(CompileTask* task) { _task = task; }
2061 };
2062
2063 inline CompilerThread* CompilerThread::current() {
2064 return JavaThread::current()->as_CompilerThread();
2065 }
2066
2067 // The active thread queue. It also keeps track of the current used
2068 // thread priorities.
2069 class Threads: AllStatic {
2070 friend class VMStructs;
2071 private:
2072 static JavaThread* _thread_list;
2073 static int _number_of_threads;
2074 static int _number_of_non_daemon_threads;
2075 static int _return_code;
2076 static int _thread_claim_parity;
2077 #ifdef ASSERT
2078 static bool _vm_complete;
2079 #endif
2080
2081 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
2082 static void initialize_jsr292_core_classes(TRAPS);
2083 public:
2084 // Thread management
2085 // force_daemon is a concession to JNI, where we may need to add a
2086 // thread to the thread list before allocating its thread object
2087 static void add(JavaThread* p, bool force_daemon = false);
2088 static void remove(JavaThread* p);
2089 static bool includes(JavaThread* p);
2090 static JavaThread* first() { return _thread_list; }
2091 static void threads_do(ThreadClosure* tc);
2092
2093 // Initializes the vm and creates the vm thread
2094 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
2095 static void convert_vm_init_libraries_to_agents();
2096 static void create_vm_init_libraries();
2097 static void create_vm_init_agents();
2098 static void shutdown_vm_agents();
2099 static bool destroy_vm();
2100 // Supported VM versions via JNI
2101 // Includes JNI_VERSION_1_1
2102 static jboolean is_supported_jni_version_including_1_1(jint version);
2103 // Does not include JNI_VERSION_1_1
2104 static jboolean is_supported_jni_version(jint version);
2105
2106 // The "thread claim parity" provides a way for threads to be claimed
2107 // by parallel worker tasks.
2108 //
2109 // Each thread contains a a "parity" field. A task will claim the
2110 // thread only if its parity field is the same as the global parity,
2111 // which is updated by calling change_thread_claim_parity().
2112 //
2113 // For this to work change_thread_claim_parity() needs to be called
2114 // exactly once in sequential code before starting parallel tasks
2115 // that should claim threads.
2116 //
2117 // New threads get their parity set to 0 and change_thread_claim_parity()
2118 // never set the global parity to 0.
2119 static int thread_claim_parity() { return _thread_claim_parity; }
2120 static void change_thread_claim_parity();
2121 static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
2122
2123 // Apply "f->do_oop" to all root oops in all threads.
2124 // This version may only be called by sequential code.
2125 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
2126 // This version may be called by sequential or parallel code.
2127 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
2128 // This creates a list of GCTasks, one per thread.
2129 static void create_thread_roots_tasks(GCTaskQueue* q);
2130 // This creates a list of GCTasks, one per thread, for marking objects.
2131 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
2132
2133 // Apply "f->do_oop" to roots in all threads that
2134 // are part of compiled frames
2135 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
2136
2137 static void convert_hcode_pointers();
2138 static void restore_hcode_pointers();
2139
2140 // Sweeper
2141 static void nmethods_do(CodeBlobClosure* cf);
2142
2143 // RedefineClasses support
2144 static void metadata_do(void f(Metadata*));
2145 static void metadata_handles_do(void f(Metadata*));
2146
2147 #ifdef ASSERT
2148 static bool is_vm_complete() { return _vm_complete; }
2149 #endif
2150
2151 // Verification
2152 static void verify();
2153 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
2154 static void print(bool print_stacks, bool internal_format) {
2155 // this function is only used by debug.cpp
2156 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
2157 }
2158 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2159
2160 // Get Java threads that are waiting to enter a monitor. If doLock
2161 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2162 // VM needs to be at a safepoint.
2163 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2164 address monitor, bool doLock);
2165
2166 // Get owning Java thread from the monitor's owner field. If doLock
2167 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2168 // VM needs to be at a safepoint.
2169 static JavaThread *owning_thread_from_monitor_owner(address owner,
2170 bool doLock);
2171
2172 // Number of threads on the active threads list
2173 static int number_of_threads() { return _number_of_threads; }
2174 // Number of non-daemon threads on the active threads list
2175 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2176
2177 // Deoptimizes all frames tied to marked nmethods
2178 static void deoptimized_wrt_marked_nmethods();
2179
2180 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2181
2182 };
2183
2184
2185 // Thread iterator
2186 class ThreadClosure: public StackObj {
2187 public:
2188 virtual void do_thread(Thread* thread) = 0;
2189 };
2190
2191 class SignalHandlerMark: public StackObj {
2192 private:
2193 Thread* _thread;
2194 public:
2195 SignalHandlerMark(Thread* t) {
2196 _thread = t;
2197 if (_thread) _thread->enter_signal_handler();
2198 }
2199 ~SignalHandlerMark() {
2200 if (_thread) _thread->leave_signal_handler();
2201 _thread = NULL;
2202 }
2203 };
2204
2205
2206 #endif // SHARE_VM_RUNTIME_THREAD_HPP