1 /*
2 * Copyright (c) 1997, 2017, 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/align.hpp"
48 #include "utilities/exceptions.hpp"
49 #include "utilities/macros.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 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 // - various subclasses eg CompilerThread, ServiceThread
101 // - WatcherThread
102
103 class Thread: public ThreadShadow {
104 friend class VMStructs;
105 friend class JVMCIVMStructs;
106 private:
107
108 #ifndef USE_LIBRARY_BASED_TLS_ONLY
109 // Current thread is maintained as a thread-local variable
110 static THREAD_LOCAL_DECL Thread* _thr_current;
111 #endif
112
113 // Exception handling
114 // (Note: _pending_exception and friends are in ThreadShadow)
115 //oop _pending_exception; // pending exception for current thread
116 // const char* _exception_file; // file information for exception (debugging only)
117 // int _exception_line; // line information for exception (debugging only)
118 protected:
119 // Support for forcing alignment of thread objects for biased locking
120 void* _real_malloc_address;
121 public:
122 void* operator new(size_t size) throw() { return allocate(size, true); }
123 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
124 return allocate(size, false); }
125 void operator delete(void* p);
126
127 protected:
128 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
129 private:
130
131 // ***************************************************************
132 // Suspend and resume support
133 // ***************************************************************
134 //
135 // VM suspend/resume no longer exists - it was once used for various
136 // things including safepoints but was deprecated and finally removed
137 // in Java 7. Because VM suspension was considered "internal" Java-level
138 // suspension was considered "external", and this legacy naming scheme
139 // remains.
140 //
141 // External suspend/resume requests come from JVM_SuspendThread,
142 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
143 // ResumeThread. External
144 // suspend requests cause _external_suspend to be set and external
145 // resume requests cause _external_suspend to be cleared.
146 // External suspend requests do not nest on top of other external
147 // suspend requests. The higher level APIs reject suspend requests
148 // for already suspended threads.
149 //
150 // The external_suspend
151 // flag is checked by has_special_runtime_exit_condition() and java thread
152 // will self-suspend when handle_special_runtime_exit_condition() is
153 // called. Most uses of the _thread_blocked state in JavaThreads are
154 // considered the same as being externally suspended; if the blocking
155 // condition lifts, the JavaThread will self-suspend. Other places
156 // where VM checks for external_suspend include:
157 // + mutex granting (do not enter monitors when thread is suspended)
158 // + state transitions from _thread_in_native
159 //
160 // In general, java_suspend() does not wait for an external suspend
161 // request to complete. When it returns, the only guarantee is that
162 // the _external_suspend field is true.
163 //
164 // wait_for_ext_suspend_completion() is used to wait for an external
165 // suspend request to complete. External suspend requests are usually
166 // followed by some other interface call that requires the thread to
167 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
168 // the interface that requires quiescence, we give the JavaThread a
169 // chance to self-suspend before we need it to be quiescent. This
170 // improves overall suspend/query performance.
171 //
172 // _suspend_flags controls the behavior of java_ suspend/resume.
173 // It must be set under the protection of SR_lock. Read from the flag is
174 // OK without SR_lock as long as the value is only used as a hint.
175 // (e.g., check _external_suspend first without lock and then recheck
176 // inside SR_lock and finish the suspension)
177 //
178 // _suspend_flags is also overloaded for other "special conditions" so
179 // that a single check indicates whether any special action is needed
180 // eg. for async exceptions.
181 // -------------------------------------------------------------------
182 // Notes:
183 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
184 // but we still update its value to keep other part of the system (mainly
185 // JVMTI) happy. ThreadState is legacy code (see notes in
186 // osThread.hpp).
187 //
188 // 2. It would be more natural if set_external_suspend() is private and
189 // part of java_suspend(), but that probably would affect the suspend/query
190 // performance. Need more investigation on this.
191
192 // suspend/resume lock: used for self-suspend
193 Monitor* _SR_lock;
194
195 protected:
196 enum SuspendFlags {
197 // NOTE: avoid using the sign-bit as cc generates different test code
198 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
199
200 _external_suspend = 0x20000000U, // thread is asked to self suspend
201 _ext_suspended = 0x40000000U, // thread has self-suspended
202 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
203
204 _has_async_exception = 0x00000001U, // there is a pending async exception
205 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
206 };
207
208 // various suspension related flags - atomically updated
209 // overloaded for async exception checking in check_special_condition_for_native_trans.
210 volatile uint32_t _suspend_flags;
211
212 private:
213 int _num_nested_signal;
214
215 DEBUG_ONLY(bool _suspendible_thread;)
216
217 public:
218 void enter_signal_handler() { _num_nested_signal++; }
219 void leave_signal_handler() { _num_nested_signal--; }
220 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
221
222 #ifdef ASSERT
223 void set_suspendible_thread() {
224 _suspendible_thread = true;
225 }
226
227 void clear_suspendible_thread() {
228 _suspendible_thread = false;
229 }
230
231 bool is_suspendible_thread() { return _suspendible_thread; }
232 #endif
233
234 private:
235 // Active_handles points to a block of handles
236 JNIHandleBlock* _active_handles;
237
238 // One-element thread local free list
239 JNIHandleBlock* _free_handle_block;
240
241 // Point to the last handle mark
242 HandleMark* _last_handle_mark;
243
244 // The parity of the last strong_roots iteration in which this thread was
245 // claimed as a task.
246 jint _oops_do_parity;
247
248 public:
249 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
250 HandleMark* last_handle_mark() const { return _last_handle_mark; }
251 private:
252
253 // debug support for checking if code does allow safepoints or not
254 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
255 // mutex, or blocking on an object synchronizer (Java locking).
256 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
257 // If !allow_allocation(), then an assertion failure will happen during allocation
258 // (Hence, !allow_safepoint() => !allow_allocation()).
259 //
260 // The two classes NoSafepointVerifier and No_Allocation_Verifier are used to set these counters.
261 //
262 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
263 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
264
265 // Used by SkipGCALot class.
266 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
267
268 friend class NoAllocVerifier;
269 friend class NoSafepointVerifier;
270 friend class PauseNoSafepointVerifier;
271 friend class GCLocker;
272
273 ThreadLocalAllocBuffer _tlab; // Thread-local eden
274 jlong _allocated_bytes; // Cumulative number of bytes allocated on
275 // the Java heap
276
277 mutable TRACE_DATA _trace_data; // Thread-local data for tracing
278
279 ThreadExt _ext;
280
281 int _vm_operation_started_count; // VM_Operation support
282 int _vm_operation_completed_count; // VM_Operation support
283
284 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
285 // is waiting to lock
286 bool _current_pending_monitor_is_from_java; // locking is from Java code
287
288 // ObjectMonitor on which this thread called Object.wait()
289 ObjectMonitor* _current_waiting_monitor;
290
291 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
292 public:
293 ObjectMonitor* omFreeList;
294 int omFreeCount; // length of omFreeList
295 int omFreeProvision; // reload chunk size
296 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
297 int omInUseCount; // length of omInUseList
298
299 #ifdef ASSERT
300 private:
301 bool _visited_for_critical_count;
302
303 public:
304 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
305 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
306 #endif
307
308 public:
309 enum {
310 is_definitely_current_thread = true
311 };
312
313 // Constructor
314 Thread();
315 virtual ~Thread();
316
317 // Manage Thread::current()
318 void initialize_thread_current();
319 void clear_thread_current(); // TLS cleanup needed before threads terminate
320
321 public:
322 // thread entry point
323 virtual void run();
324
325 // Testers
326 virtual bool is_VM_thread() const { return false; }
327 virtual bool is_Java_thread() const { return false; }
328 virtual bool is_Compiler_thread() const { return false; }
329 virtual bool is_Code_cache_sweeper_thread() const { return false; }
330 virtual bool is_hidden_from_external_view() const { return false; }
331 virtual bool is_jvmti_agent_thread() const { return false; }
332 // True iff the thread can perform GC operations at a safepoint.
333 // Generally will be true only of VM thread and parallel GC WorkGang
334 // threads.
335 virtual bool is_GC_task_thread() const { return false; }
336 virtual bool is_Watcher_thread() const { return false; }
337 virtual bool is_ConcurrentGC_thread() const { return false; }
338 virtual bool is_Named_thread() const { return false; }
339 virtual bool is_Worker_thread() const { return false; }
340
341 // Can this thread make Java upcalls
342 virtual bool can_call_java() const { return false; }
343
344 // Casts
345 virtual WorkerThread* as_Worker_thread() const { return NULL; }
346
347 virtual char* name() const { return (char*)"Unknown thread"; }
348
349 // Returns the current thread (ASSERTS if NULL)
350 static inline Thread* current();
351 // Returns the current thread, or NULL if not attached
352 static inline Thread* current_or_null();
353 // Returns the current thread, or NULL if not attached, and is
354 // safe for use from signal-handlers
355 static inline Thread* current_or_null_safe();
356
357 // Common thread operations
358 static void set_priority(Thread* thread, ThreadPriority priority);
359 static ThreadPriority get_priority(const Thread* const thread);
360 static void start(Thread* thread);
361 static void interrupt(Thread* thr);
362 static bool is_interrupted(Thread* thr, bool clear_interrupted);
363
364 void set_native_thread_name(const char *name) {
365 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
366 os::set_native_thread_name(name);
367 }
368
369 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
370 Monitor* SR_lock() const { return _SR_lock; }
371
372 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
373
374 inline void set_suspend_flag(SuspendFlags f);
375 inline void clear_suspend_flag(SuspendFlags f);
376
377 inline void set_has_async_exception();
378 inline void clear_has_async_exception();
379
380 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
381
382 inline void set_critical_native_unlock();
383 inline void clear_critical_native_unlock();
384
385 // Support for Unhandled Oop detection
386 // Add the field for both, fastdebug and debug, builds to keep
387 // Thread's fields layout the same.
388 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build.
389 #ifdef CHECK_UNHANDLED_OOPS
390 private:
391 UnhandledOops* _unhandled_oops;
392 #elif defined(ASSERT)
393 private:
394 void* _unhandled_oops;
395 #endif
396 #ifdef CHECK_UNHANDLED_OOPS
397 public:
398 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
399 // Mark oop safe for gc. It may be stack allocated but won't move.
400 void allow_unhandled_oop(oop *op) {
401 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
402 }
403 // Clear oops at safepoint so crashes point to unhandled oop violator
404 void clear_unhandled_oops() {
405 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
406 }
407 #endif // CHECK_UNHANDLED_OOPS
408
409 public:
410 #ifndef PRODUCT
411 bool skip_gcalot() { return _skip_gcalot; }
412 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
413 #endif
414
415 // Installs a pending exception to be inserted later
416 static void send_async_exception(oop thread_oop, oop java_throwable);
417
418 // Resource area
419 ResourceArea* resource_area() const { return _resource_area; }
420 void set_resource_area(ResourceArea* area) { _resource_area = area; }
421
422 OSThread* osthread() const { return _osthread; }
423 void set_osthread(OSThread* thread) { _osthread = thread; }
424
425 // JNI handle support
426 JNIHandleBlock* active_handles() const { return _active_handles; }
427 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
428 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
429 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
430
431 // Internal handle support
432 HandleArea* handle_area() const { return _handle_area; }
433 void set_handle_area(HandleArea* area) { _handle_area = area; }
434
435 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
436 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
437
438 // Thread-Local Allocation Buffer (TLAB) support
439 ThreadLocalAllocBuffer& tlab() { return _tlab; }
440 void initialize_tlab() {
441 if (UseTLAB) {
442 tlab().initialize();
443 }
444 }
445
446 jlong allocated_bytes() { return _allocated_bytes; }
447 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
448 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
449 inline jlong cooked_allocated_bytes();
450
451 TRACE_DEFINE_THREAD_TRACE_DATA_OFFSET;
452 TRACE_DATA* trace_data() const { return &_trace_data; }
453
454 const ThreadExt& ext() const { return _ext; }
455 ThreadExt& ext() { return _ext; }
456
457 // VM operation support
458 int vm_operation_ticket() { return ++_vm_operation_started_count; }
459 int vm_operation_completed_count() { return _vm_operation_completed_count; }
460 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
461
462 // For tracking the heavyweight monitor the thread is pending on.
463 ObjectMonitor* current_pending_monitor() {
464 return _current_pending_monitor;
465 }
466 void set_current_pending_monitor(ObjectMonitor* monitor) {
467 _current_pending_monitor = monitor;
468 }
469 void set_current_pending_monitor_is_from_java(bool from_java) {
470 _current_pending_monitor_is_from_java = from_java;
471 }
472 bool current_pending_monitor_is_from_java() {
473 return _current_pending_monitor_is_from_java;
474 }
475
476 // For tracking the ObjectMonitor on which this thread called Object.wait()
477 ObjectMonitor* current_waiting_monitor() {
478 return _current_waiting_monitor;
479 }
480 void set_current_waiting_monitor(ObjectMonitor* monitor) {
481 _current_waiting_monitor = monitor;
482 }
483
484 // GC support
485 // Apply "f->do_oop" to all root oops in "this".
486 // Used by JavaThread::oops_do.
487 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
488 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf);
489
490 // Handles the parallel case for the method below.
491 private:
492 bool claim_oops_do_par_case(int collection_parity);
493 public:
494 // Requires that "collection_parity" is that of the current roots
495 // iteration. If "is_par" is false, sets the parity of "this" to
496 // "collection_parity", and returns "true". If "is_par" is true,
497 // uses an atomic instruction to set the current threads parity to
498 // "collection_parity", if it is not already. Returns "true" iff the
499 // calling thread does the update, this indicates that the calling thread
500 // has claimed the thread's stack as a root groop in the current
501 // collection.
502 bool claim_oops_do(bool is_par, int collection_parity) {
503 if (!is_par) {
504 _oops_do_parity = collection_parity;
505 return true;
506 } else {
507 return claim_oops_do_par_case(collection_parity);
508 }
509 }
510
511 // jvmtiRedefineClasses support
512 void metadata_handles_do(void f(Metadata*));
513
514 // Used by fast lock support
515 virtual bool is_lock_owned(address adr) const;
516
517 // Check if address is in the stack of the thread (not just for locks).
518 // Warning: the method can only be used on the running thread
519 bool is_in_stack(address adr) const;
520 // Check if address is in the usable part of the stack (excludes protected
521 // guard pages)
522 bool is_in_usable_stack(address adr) const;
523
524 // Sets this thread as starting thread. Returns failure if thread
525 // creation fails due to lack of memory, too many threads etc.
526 bool set_as_starting_thread();
527
528 protected:
529 // OS data associated with the thread
530 OSThread* _osthread; // Platform-specific thread information
531
532 // Thread local resource area for temporary allocation within the VM
533 ResourceArea* _resource_area;
534
535 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
536
537 // Thread local handle area for allocation of handles within the VM
538 HandleArea* _handle_area;
539 GrowableArray<Metadata*>* _metadata_handles;
540
541 // Support for stack overflow handling, get_thread, etc.
542 address _stack_base;
543 size_t _stack_size;
544 uintptr_t _self_raw_id; // used by get_thread (mutable)
545 int _lgrp_id;
546
547 public:
548 // Stack overflow support
549 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
550 void set_stack_base(address base) { _stack_base = base; }
551 size_t stack_size() const { return _stack_size; }
552 void set_stack_size(size_t size) { _stack_size = size; }
553 address stack_end() const { return stack_base() - stack_size(); }
554 void record_stack_base_and_size();
555
556 bool on_local_stack(address adr) const {
557 // QQQ this has knowledge of direction, ought to be a stack method
558 return (_stack_base >= adr && adr >= stack_end());
559 }
560
561 uintptr_t self_raw_id() { return _self_raw_id; }
562 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
563
564 int lgrp_id() const { return _lgrp_id; }
565 void set_lgrp_id(int value) { _lgrp_id = value; }
566
567 // Printing
568 virtual void print_on(outputStream* st) const;
569 void print() const { print_on(tty); }
570 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
571
572 // Debug-only code
573 #ifdef ASSERT
574 private:
575 // Deadlock detection support for Mutex locks. List of locks own by thread.
576 Monitor* _owned_locks;
577 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
578 // thus the friendship
579 friend class Mutex;
580 friend class Monitor;
581
582 public:
583 void print_owned_locks_on(outputStream* st) const;
584 void print_owned_locks() const { print_owned_locks_on(tty); }
585 Monitor* owned_locks() const { return _owned_locks; }
586 bool owns_locks() const { return owned_locks() != NULL; }
587 bool owns_locks_but_compiled_lock() const;
588 int oops_do_parity() const { return _oops_do_parity; }
589
590 // Deadlock detection
591 bool allow_allocation() { return _allow_allocation_count == 0; }
592 ResourceMark* current_resource_mark() { return _current_resource_mark; }
593 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
594 #endif
595
596 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
597
598 private:
599 volatile int _jvmti_env_iteration_count;
600
601 public:
602 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
603 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
604 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
605
606 // Code generation
607 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
608 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
609 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
610
611 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
612 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
613
614 #define TLAB_FIELD_OFFSET(name) \
615 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
616
617 TLAB_FIELD_OFFSET(start)
618 TLAB_FIELD_OFFSET(end)
619 TLAB_FIELD_OFFSET(top)
620 TLAB_FIELD_OFFSET(pf_top)
621 TLAB_FIELD_OFFSET(size) // desired_size
622 TLAB_FIELD_OFFSET(refill_waste_limit)
623 TLAB_FIELD_OFFSET(number_of_refills)
624 TLAB_FIELD_OFFSET(fast_refill_waste)
625 TLAB_FIELD_OFFSET(slow_allocations)
626
627 #undef TLAB_FIELD_OFFSET
628
629 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
630
631 public:
632 volatile intptr_t _Stalled;
633 volatile int _TypeTag;
634 ParkEvent * _ParkEvent; // for synchronized()
635 ParkEvent * _SleepEvent; // for Thread.sleep
636 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
637 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
638 int NativeSyncRecursion; // diagnostic
639
640 volatile int _OnTrap; // Resume-at IP delta
641 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
642 jint _hashStateX; // thread-specific hashCode generator state
643 jint _hashStateY;
644 jint _hashStateZ;
645 void * _schedctl;
646
647
648 volatile jint rng[4]; // RNG for spin loop
649
650 // Low-level leaf-lock primitives used to implement synchronization
651 // and native monitor-mutex infrastructure.
652 // Not for general synchronization use.
653 static void SpinAcquire(volatile int * Lock, const char * Name);
654 static void SpinRelease(volatile int * Lock);
655 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
656 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
657 static void muxRelease(volatile intptr_t * Lock);
658 };
659
660 // Inline implementation of Thread::current()
661 inline Thread* Thread::current() {
662 Thread* current = current_or_null();
663 assert(current != NULL, "Thread::current() called on detached thread");
664 return current;
665 }
666
667 inline Thread* Thread::current_or_null() {
668 #ifndef USE_LIBRARY_BASED_TLS_ONLY
669 return _thr_current;
670 #else
671 return ThreadLocalStorage::thread();
672 #endif
673 }
674
675 inline Thread* Thread::current_or_null_safe() {
676 return ThreadLocalStorage::thread();
677 }
678
679 // Name support for threads. non-JavaThread subclasses with multiple
680 // uniquely named instances should derive from this.
681 class NamedThread: public Thread {
682 friend class VMStructs;
683 enum {
684 max_name_len = 64
685 };
686 private:
687 char* _name;
688 // log JavaThread being processed by oops_do
689 JavaThread* _processed_thread;
690 uint _gc_id; // The current GC id when a thread takes part in GC
691
692 public:
693 NamedThread();
694 ~NamedThread();
695 // May only be called once per thread.
696 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
697 void initialize_named_thread();
698 virtual bool is_Named_thread() const { return true; }
699 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
700 JavaThread *processed_thread() { return _processed_thread; }
701 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
702 virtual void print_on(outputStream* st) const;
703
704 void set_gc_id(uint gc_id) { _gc_id = gc_id; }
705 uint gc_id() { return _gc_id; }
706 };
707
708 // Worker threads are named and have an id of an assigned work.
709 class WorkerThread: public NamedThread {
710 private:
711 uint _id;
712 public:
713 WorkerThread() : _id(0) { }
714 virtual bool is_Worker_thread() const { return true; }
715
716 virtual WorkerThread* as_Worker_thread() const {
717 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
718 return (WorkerThread*) this;
719 }
720
721 void set_id(uint work_id) { _id = work_id; }
722 uint id() const { return _id; }
723 };
724
725 // A single WatcherThread is used for simulating timer interrupts.
726 class WatcherThread: public Thread {
727 friend class VMStructs;
728 public:
729 virtual void run();
730
731 private:
732 static WatcherThread* _watcher_thread;
733
734 static bool _startable;
735 // volatile due to at least one lock-free read
736 volatile static bool _should_terminate;
737
738 os::WatcherThreadCrashProtection* _crash_protection;
739 public:
740 enum SomeConstants {
741 delay_interval = 10 // interrupt delay in milliseconds
742 };
743
744 // Constructor
745 WatcherThread();
746
747 // No destruction allowed
748 ~WatcherThread() {
749 guarantee(false, "WatcherThread deletion must fix the race with VM termination");
750 }
751
752 // Tester
753 bool is_Watcher_thread() const { return true; }
754
755 // Printing
756 char* name() const { return (char*)"VM Periodic Task Thread"; }
757 void print_on(outputStream* st) const;
758 void unpark();
759
760 // Returns the single instance of WatcherThread
761 static WatcherThread* watcher_thread() { return _watcher_thread; }
762
763 // Create and start the single instance of WatcherThread, or stop it on shutdown
764 static void start();
765 static void stop();
766 // Only allow start once the VM is sufficiently initialized
767 // Otherwise the first task to enroll will trigger the start
768 static void make_startable();
769
770 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
771 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
772 _crash_protection = crash_protection;
773 }
774
775 bool has_crash_protection() const { return _crash_protection != NULL; }
776 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
777
778 private:
779 int sleep() const;
780 };
781
782
783 class CompilerThread;
784
785 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
786
787 class JavaThread: public Thread {
788 friend class VMStructs;
789 friend class JVMCIVMStructs;
790 friend class WhiteBox;
791 private:
792 JavaThread* _next; // The next thread in the Threads list
793 oop _threadObj; // The Java level thread object
794
795 #ifdef ASSERT
796 private:
797 int _java_call_counter;
798
799 public:
800 int java_call_counter() { return _java_call_counter; }
801 void inc_java_call_counter() { _java_call_counter++; }
802 void dec_java_call_counter() {
803 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
804 _java_call_counter--;
805 }
806 private: // restore original namespace restriction
807 #endif // ifdef ASSERT
808
809 #ifndef PRODUCT
810 public:
811 enum {
812 jump_ring_buffer_size = 16
813 };
814 private: // restore original namespace restriction
815 #endif
816
817 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
818
819 ThreadFunction _entry_point;
820
821 JNIEnv _jni_environment;
822
823 // Deopt support
824 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
825
826 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
827 // transition out of native
828 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized
829 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
830 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
831 // Because deoptimization is lazy we must save jvmti requests to set locals
832 // in compiled frames until we deoptimize and we have an interpreter frame.
833 // This holds the pointer to array (yeah like there might be more than one) of
834 // description of compiled vframes that have locals that need to be updated.
835 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
836
837 // Handshake value for fixing 6243940. We need a place for the i2c
838 // adapter to store the callee Method*. This value is NEVER live
839 // across a gc point so it does NOT have to be gc'd
840 // The handshake is open ended since we can't be certain that it will
841 // be NULLed. This is because we rarely ever see the race and end up
842 // in handle_wrong_method which is the backend of the handshake. See
843 // code in i2c adapters and handle_wrong_method.
844
845 Method* _callee_target;
846
847 // Used to pass back results to the interpreter or generated code running Java code.
848 oop _vm_result; // oop result is GC-preserved
849 Metadata* _vm_result_2; // non-oop result
850
851 // See ReduceInitialCardMarks: this holds the precise space interval of
852 // the most recent slow path allocation for which compiled code has
853 // elided card-marks for performance along the fast-path.
854 MemRegion _deferred_card_mark;
855
856 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
857 // allocated during deoptimization
858 // and by JNI_MonitorEnter/Exit
859
860 // Async. requests support
861 enum AsyncRequests {
862 _no_async_condition = 0,
863 _async_exception,
864 _async_unsafe_access_error
865 };
866 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
867 oop _pending_async_exception;
868
869 // Safepoint support
870 public: // Expose _thread_state for SafeFetchInt()
871 volatile JavaThreadState _thread_state;
872 private:
873 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
874 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
875
876 // JavaThread termination support
877 enum TerminatedTypes {
878 _not_terminated = 0xDEAD - 2,
879 _thread_exiting, // JavaThread::exit() has been called for this thread
880 _thread_terminated, // JavaThread is removed from thread list
881 _vm_exited // JavaThread is still executing native code, but VM is terminated
882 // only VM_Exit can set _vm_exited
883 };
884
885 // In general a JavaThread's _terminated field transitions as follows:
886 //
887 // _not_terminated => _thread_exiting => _thread_terminated
888 //
889 // _vm_exited is a special value to cover the case of a JavaThread
890 // executing native code after the VM itself is terminated.
891 volatile TerminatedTypes _terminated;
892 // suspend/resume support
893 volatile bool _suspend_equivalent; // Suspend equivalent condition
894 jint _in_deopt_handler; // count of deoptimization
895 // handlers thread is in
896 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
897 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
898 // never locked) when throwing an exception. Used by interpreter only.
899
900 // JNI attach states:
901 enum JNIAttachStates {
902 _not_attaching_via_jni = 1, // thread is not attaching via JNI
903 _attaching_via_jni, // thread is attaching via JNI
904 _attached_via_jni // thread has attached via JNI
905 };
906
907 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
908 // A native thread that is attaching via JNI starts with a value
909 // of _attaching_via_jni and transitions to _attached_via_jni.
910 volatile JNIAttachStates _jni_attach_state;
911
912 public:
913 // State of the stack guard pages for this thread.
914 enum StackGuardState {
915 stack_guard_unused, // not needed
916 stack_guard_reserved_disabled,
917 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow
918 stack_guard_enabled // enabled
919 };
920
921 private:
922
923 #if INCLUDE_JVMCI
924 // The _pending_* fields below are used to communicate extra information
925 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
926
927 // Communicates the DeoptReason and DeoptAction of the uncommon trap
928 int _pending_deoptimization;
929
930 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
931 // before the monitor has been acquired.
932 bool _pending_monitorenter;
933
934 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
935 bool _pending_transfer_to_interpreter;
936
937 // Guard for re-entrant call to JVMCIRuntime::adjust_comp_level
938 bool _adjusting_comp_level;
939
940 // An object that JVMCI compiled code can use to further describe and
941 // uniquely identify the speculative optimization guarded by the uncommon trap
942 oop _pending_failed_speculation;
943
944 // These fields are mutually exclusive in terms of live ranges.
945 union {
946 // Communicates the pc at which the most recent implicit exception occurred
947 // from the signal handler to a deoptimization stub.
948 address _implicit_exception_pc;
949
950 // Communicates an alternative call target to an i2c stub from a JavaCall .
951 address _alternate_call_target;
952 } _jvmci;
953
954 // Support for high precision, thread sensitive counters in JVMCI compiled code.
955 jlong* _jvmci_counters;
956
957 public:
958 static jlong* _jvmci_old_thread_counters;
959 static void collect_counters(typeArrayOop array);
960 private:
961 #endif // INCLUDE_JVMCI
962
963 StackGuardState _stack_guard_state;
964
965 // Precompute the limit of the stack as used in stack overflow checks.
966 // We load it from here to simplify the stack overflow check in assembly.
967 address _stack_overflow_limit;
968 address _reserved_stack_activation;
969
970 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
971 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
972 // code)
973 volatile oop _exception_oop; // Exception thrown in compiled code
974 volatile address _exception_pc; // PC where exception happened
975 volatile address _exception_handler_pc; // PC for handler of exception
976 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
977
978 private:
979 // support for JNI critical regions
980 jint _jni_active_critical; // count of entries into JNI critical region
981
982 // Checked JNI: function name requires exception check
983 char* _pending_jni_exception_check_fn;
984
985 // For deadlock detection.
986 int _depth_first_number;
987
988 // JVMTI PopFrame support
989 // This is set to popframe_pending to signal that top Java frame should be popped immediately
990 int _popframe_condition;
991
992 // If reallocation of scalar replaced objects fails, we throw OOM
993 // and during exception propagation, pop the top
994 // _frames_to_pop_failed_realloc frames, the ones that reference
995 // failed reallocations.
996 int _frames_to_pop_failed_realloc;
997
998 #ifndef PRODUCT
999 int _jmp_ring_index;
1000 struct {
1001 // We use intptr_t instead of address so debugger doesn't try and display strings
1002 intptr_t _target;
1003 intptr_t _instruction;
1004 const char* _file;
1005 int _line;
1006 } _jmp_ring[jump_ring_buffer_size];
1007 #endif // PRODUCT
1008
1009 #if INCLUDE_ALL_GCS
1010 // Support for G1 barriers
1011
1012 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier.
1013 // Set of all such queues.
1014 static SATBMarkQueueSet _satb_mark_queue_set;
1015
1016 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
1017 // Set of all such queues.
1018 static DirtyCardQueueSet _dirty_card_queue_set;
1019
1020 void flush_barrier_queues();
1021 #endif // INCLUDE_ALL_GCS
1022
1023 friend class VMThread;
1024 friend class ThreadWaitTransition;
1025 friend class VM_Exit;
1026
1027 void initialize(); // Initialized the instance variables
1028
1029 public:
1030 // Constructor
1031 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1032 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1033 ~JavaThread();
1034
1035 #ifdef ASSERT
1036 // verify this JavaThread hasn't be published in the Threads::list yet
1037 void verify_not_published();
1038 #endif
1039
1040 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1041 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1042 _jni_environment.functions = functionTable;
1043 }
1044 struct JNINativeInterface_* get_jni_functions() {
1045 return (struct JNINativeInterface_ *)_jni_environment.functions;
1046 }
1047
1048 // This function is called at thread creation to allow
1049 // platform specific thread variables to be initialized.
1050 void cache_global_variables();
1051
1052 // Executes Shutdown.shutdown()
1053 void invoke_shutdown_hooks();
1054
1055 // Cleanup on thread exit
1056 enum ExitType {
1057 normal_exit,
1058 jni_detach
1059 };
1060 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1061
1062 void cleanup_failed_attach_current_thread();
1063
1064 // Testers
1065 virtual bool is_Java_thread() const { return true; }
1066 virtual bool can_call_java() const { return true; }
1067
1068 // Thread chain operations
1069 JavaThread* next() const { return _next; }
1070 void set_next(JavaThread* p) { _next = p; }
1071
1072 // Thread oop. threadObj() can be NULL for initial JavaThread
1073 // (or for threads attached via JNI)
1074 oop threadObj() const { return _threadObj; }
1075 void set_threadObj(oop p) { _threadObj = p; }
1076
1077 ThreadPriority java_priority() const; // Read from threadObj()
1078
1079 // Prepare thread and add to priority queue. If a priority is
1080 // not specified, use the priority of the thread object. Threads_lock
1081 // must be held while this function is called.
1082 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1083 void prepare_ext();
1084
1085 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1086 address saved_exception_pc() { return _saved_exception_pc; }
1087
1088
1089 ThreadFunction entry_point() const { return _entry_point; }
1090
1091 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1092 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1093
1094 // Last frame anchor routines
1095
1096 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1097
1098 // last_Java_sp
1099 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1100 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1101
1102 // last_Java_pc
1103
1104 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1105
1106 // Safepoint support
1107 #if !(defined(PPC64) || defined(AARCH64))
1108 JavaThreadState thread_state() const { return _thread_state; }
1109 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1110 #else
1111 // Use membars when accessing volatile _thread_state. See
1112 // Threads::create_vm() for size checks.
1113 inline JavaThreadState thread_state() const;
1114 inline void set_thread_state(JavaThreadState s);
1115 #endif
1116 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1117 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1118 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1119
1120 // thread has called JavaThread::exit() or is terminated
1121 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1122 // thread is terminated (no longer on the threads list); we compare
1123 // against the two non-terminated values so that a freed JavaThread
1124 // will also be considered terminated.
1125 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1126 void set_terminated(TerminatedTypes t) { _terminated = t; }
1127 // special for Threads::remove() which is static:
1128 void set_terminated_value() { _terminated = _thread_terminated; }
1129 void block_if_vm_exited();
1130
1131 bool doing_unsafe_access() { return _doing_unsafe_access; }
1132 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1133
1134 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1135 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1136
1137 // Suspend/resume support for JavaThread
1138 private:
1139 inline void set_ext_suspended();
1140 inline void clear_ext_suspended();
1141
1142 public:
1143 void java_suspend();
1144 void java_resume();
1145 int java_suspend_self();
1146
1147 void check_and_wait_while_suspended() {
1148 assert(JavaThread::current() == this, "sanity check");
1149
1150 bool do_self_suspend;
1151 do {
1152 // were we externally suspended while we were waiting?
1153 do_self_suspend = handle_special_suspend_equivalent_condition();
1154 if (do_self_suspend) {
1155 // don't surprise the thread that suspended us by returning
1156 java_suspend_self();
1157 set_suspend_equivalent();
1158 }
1159 } while (do_self_suspend);
1160 }
1161 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1162 // Check for async exception in addition to safepoint and suspend request.
1163 static void check_special_condition_for_native_trans(JavaThread *thread);
1164
1165 // Same as check_special_condition_for_native_trans but finishes the
1166 // transition into thread_in_Java mode so that it can potentially
1167 // block.
1168 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1169
1170 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1171 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1172 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1173 // Warning: is_ext_suspend_completed() may temporarily drop the
1174 // SR_lock to allow the thread to reach a stable thread state if
1175 // it is currently in a transient thread state.
1176 return is_ext_suspend_completed(false /* !called_by_wait */,
1177 SuspendRetryDelay, bits);
1178 }
1179
1180 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1181 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1182 // passed as the count and delay parameters. Experiments with specific
1183 // calls to wait_for_ext_suspend_completion() can be done by passing
1184 // other values in the code. Experiments with all calls can be done
1185 // via the appropriate -XX options.
1186 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1187
1188 inline void set_external_suspend();
1189 inline void clear_external_suspend();
1190
1191 inline void set_deopt_suspend();
1192 inline void clear_deopt_suspend();
1193 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1194
1195 bool is_external_suspend() const {
1196 return (_suspend_flags & _external_suspend) != 0;
1197 }
1198 // Whenever a thread transitions from native to vm/java it must suspend
1199 // if external|deopt suspend is present.
1200 bool is_suspend_after_native() const {
1201 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1202 }
1203
1204 // external suspend request is completed
1205 bool is_ext_suspended() const {
1206 return (_suspend_flags & _ext_suspended) != 0;
1207 }
1208
1209 bool is_external_suspend_with_lock() const {
1210 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1211 return is_external_suspend();
1212 }
1213
1214 // Special method to handle a pending external suspend request
1215 // when a suspend equivalent condition lifts.
1216 bool handle_special_suspend_equivalent_condition() {
1217 assert(is_suspend_equivalent(),
1218 "should only be called in a suspend equivalence condition");
1219 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1220 bool ret = is_external_suspend();
1221 if (!ret) {
1222 // not about to self-suspend so clear suspend equivalence
1223 clear_suspend_equivalent();
1224 }
1225 // implied else:
1226 // We have a pending external suspend request so we leave the
1227 // suspend_equivalent flag set until java_suspend_self() sets
1228 // the ext_suspended flag and clears the suspend_equivalent
1229 // flag. This insures that wait_for_ext_suspend_completion()
1230 // will return consistent values.
1231 return ret;
1232 }
1233
1234 // utility methods to see if we are doing some kind of suspension
1235 bool is_being_ext_suspended() const {
1236 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1237 return is_ext_suspended() || is_external_suspend();
1238 }
1239
1240 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1241
1242 void set_suspend_equivalent() { _suspend_equivalent = true; }
1243 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1244
1245 // Thread.stop support
1246 void send_thread_stop(oop throwable);
1247 AsyncRequests clear_special_runtime_exit_condition() {
1248 AsyncRequests x = _special_runtime_exit_condition;
1249 _special_runtime_exit_condition = _no_async_condition;
1250 return x;
1251 }
1252
1253 // Are any async conditions present?
1254 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1255
1256 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1257
1258 // these next two are also used for self-suspension and async exception support
1259 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1260
1261 // Return true if JavaThread has an asynchronous condition or
1262 // if external suspension is requested.
1263 bool has_special_runtime_exit_condition() {
1264 // We call is_external_suspend() last since external suspend should
1265 // be less common. Because we don't use is_external_suspend_with_lock
1266 // it is possible that we won't see an asynchronous external suspend
1267 // request that has just gotten started, i.e., SR_lock grabbed but
1268 // _external_suspend field change either not made yet or not visible
1269 // yet. However, this is okay because the request is asynchronous and
1270 // we will see the new flag value the next time through. It's also
1271 // possible that the external suspend request is dropped after
1272 // we have checked is_external_suspend(), we will recheck its value
1273 // under SR_lock in java_suspend_self().
1274 return (_special_runtime_exit_condition != _no_async_condition) ||
1275 is_external_suspend() || is_deopt_suspend();
1276 }
1277
1278 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1279
1280 inline void set_pending_async_exception(oop e);
1281
1282 // Fast-locking support
1283 bool is_lock_owned(address adr) const;
1284
1285 // Accessors for vframe array top
1286 // The linked list of vframe arrays are sorted on sp. This means when we
1287 // unpack the head must contain the vframe array to unpack.
1288 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1289 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1290
1291 // Side structure for deferring update of java frame locals until deopt occurs
1292 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1293 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1294
1295 // These only really exist to make debugging deopt problems simpler
1296
1297 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1298 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1299
1300 // The special resourceMark used during deoptimization
1301
1302 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1303 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1304
1305 intptr_t* must_deopt_id() { return _must_deopt_id; }
1306 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1307 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1308
1309 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; }
1310 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; }
1311
1312 Method* callee_target() const { return _callee_target; }
1313 void set_callee_target (Method* x) { _callee_target = x; }
1314
1315 // Oop results of vm runtime calls
1316 oop vm_result() const { return _vm_result; }
1317 void set_vm_result (oop x) { _vm_result = x; }
1318
1319 Metadata* vm_result_2() const { return _vm_result_2; }
1320 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1321
1322 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1323 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1324
1325 #if INCLUDE_JVMCI
1326 int pending_deoptimization() const { return _pending_deoptimization; }
1327 oop pending_failed_speculation() const { return _pending_failed_speculation; }
1328 bool adjusting_comp_level() const { return _adjusting_comp_level; }
1329 void set_adjusting_comp_level(bool b) { _adjusting_comp_level = b; }
1330 bool has_pending_monitorenter() const { return _pending_monitorenter; }
1331 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
1332 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
1333 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; }
1334 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
1335 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
1336 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
1337 #endif // INCLUDE_JVMCI
1338
1339 // Exception handling for compiled methods
1340 oop exception_oop() const { return _exception_oop; }
1341 address exception_pc() const { return _exception_pc; }
1342 address exception_handler_pc() const { return _exception_handler_pc; }
1343 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1344
1345 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1346 void set_exception_pc(address a) { _exception_pc = a; }
1347 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1348 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1349
1350 void clear_exception_oop_and_pc() {
1351 set_exception_oop(NULL);
1352 set_exception_pc(NULL);
1353 }
1354
1355 // Stack overflow support
1356 //
1357 // (small addresses)
1358 //
1359 // -- <-- stack_end() ---
1360 // | |
1361 // | red pages |
1362 // | |
1363 // -- <-- stack_red_zone_base() |
1364 // | |
1365 // | guard
1366 // | yellow pages zone
1367 // | |
1368 // | |
1369 // -- <-- stack_yellow_zone_base() |
1370 // | |
1371 // | |
1372 // | reserved pages |
1373 // | |
1374 // -- <-- stack_reserved_zone_base() --- ---
1375 // /|\ shadow <-- stack_overflow_limit() (somewhere in here)
1376 // | zone
1377 // \|/ size
1378 // some untouched memory ---
1379 //
1380 //
1381 // --
1382 // |
1383 // | shadow zone
1384 // |
1385 // --
1386 // x frame n
1387 // --
1388 // x frame n-1
1389 // x
1390 // --
1391 // ...
1392 //
1393 // --
1394 // x frame 0
1395 // -- <-- stack_base()
1396 //
1397 // (large addresses)
1398 //
1399
1400 private:
1401 // These values are derived from flags StackRedPages, StackYellowPages,
1402 // StackReservedPages and StackShadowPages. The zone size is determined
1403 // ergonomically if page_size > 4K.
1404 static size_t _stack_red_zone_size;
1405 static size_t _stack_yellow_zone_size;
1406 static size_t _stack_reserved_zone_size;
1407 static size_t _stack_shadow_zone_size;
1408 public:
1409 inline size_t stack_available(address cur_sp);
1410
1411 static size_t stack_red_zone_size() {
1412 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized.");
1413 return _stack_red_zone_size;
1414 }
1415 static void set_stack_red_zone_size(size_t s) {
1416 assert(is_aligned(s, os::vm_page_size()),
1417 "We can not protect if the red zone size is not page aligned.");
1418 assert(_stack_red_zone_size == 0, "This should be called only once.");
1419 _stack_red_zone_size = s;
1420 }
1421 address stack_red_zone_base() {
1422 return (address)(stack_end() + stack_red_zone_size());
1423 }
1424 bool in_stack_red_zone(address a) {
1425 return a <= stack_red_zone_base() && a >= stack_end();
1426 }
1427
1428 static size_t stack_yellow_zone_size() {
1429 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized.");
1430 return _stack_yellow_zone_size;
1431 }
1432 static void set_stack_yellow_zone_size(size_t s) {
1433 assert(is_aligned(s, os::vm_page_size()),
1434 "We can not protect if the yellow zone size is not page aligned.");
1435 assert(_stack_yellow_zone_size == 0, "This should be called only once.");
1436 _stack_yellow_zone_size = s;
1437 }
1438
1439 static size_t stack_reserved_zone_size() {
1440 // _stack_reserved_zone_size may be 0. This indicates the feature is off.
1441 return _stack_reserved_zone_size;
1442 }
1443 static void set_stack_reserved_zone_size(size_t s) {
1444 assert(is_aligned(s, os::vm_page_size()),
1445 "We can not protect if the reserved zone size is not page aligned.");
1446 assert(_stack_reserved_zone_size == 0, "This should be called only once.");
1447 _stack_reserved_zone_size = s;
1448 }
1449 address stack_reserved_zone_base() {
1450 return (address)(stack_end() +
1451 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size()));
1452 }
1453 bool in_stack_reserved_zone(address a) {
1454 return (a <= stack_reserved_zone_base()) &&
1455 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size()));
1456 }
1457
1458 static size_t stack_yellow_reserved_zone_size() {
1459 return _stack_yellow_zone_size + _stack_reserved_zone_size;
1460 }
1461 bool in_stack_yellow_reserved_zone(address a) {
1462 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base());
1463 }
1464
1465 // Size of red + yellow + reserved zones.
1466 static size_t stack_guard_zone_size() {
1467 return stack_red_zone_size() + stack_yellow_reserved_zone_size();
1468 }
1469
1470 static size_t stack_shadow_zone_size() {
1471 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized.");
1472 return _stack_shadow_zone_size;
1473 }
1474 static void set_stack_shadow_zone_size(size_t s) {
1475 // The shadow area is not allocated or protected, so
1476 // it needs not be page aligned.
1477 // But the stack bang currently assumes that it is a
1478 // multiple of page size. This guarantees that the bang
1479 // loop touches all pages in the shadow zone.
1480 // This can be guaranteed differently, as well. E.g., if
1481 // the page size is a multiple of 4K, banging in 4K steps
1482 // suffices to touch all pages. (Some pages are banged
1483 // several times, though.)
1484 assert(is_aligned(s, os::vm_page_size()),
1485 "Stack bang assumes multiple of page size.");
1486 assert(_stack_shadow_zone_size == 0, "This should be called only once.");
1487 _stack_shadow_zone_size = s;
1488 }
1489
1490 void create_stack_guard_pages();
1491 void remove_stack_guard_pages();
1492
1493 void enable_stack_reserved_zone();
1494 void disable_stack_reserved_zone();
1495 void enable_stack_yellow_reserved_zone();
1496 void disable_stack_yellow_reserved_zone();
1497 void enable_stack_red_zone();
1498 void disable_stack_red_zone();
1499
1500 inline bool stack_guard_zone_unused();
1501 inline bool stack_yellow_reserved_zone_disabled();
1502 inline bool stack_reserved_zone_disabled();
1503 inline bool stack_guards_enabled();
1504
1505 address reserved_stack_activation() const { return _reserved_stack_activation; }
1506 void set_reserved_stack_activation(address addr) {
1507 assert(_reserved_stack_activation == stack_base()
1508 || _reserved_stack_activation == NULL
1509 || addr == stack_base(), "Must not be set twice");
1510 _reserved_stack_activation = addr;
1511 }
1512
1513 // Attempt to reguard the stack after a stack overflow may have occurred.
1514 // Returns true if (a) guard pages are not needed on this thread, (b) the
1515 // pages are already guarded, or (c) the pages were successfully reguarded.
1516 // Returns false if there is not enough stack space to reguard the pages, in
1517 // which case the caller should unwind a frame and try again. The argument
1518 // should be the caller's (approximate) sp.
1519 bool reguard_stack(address cur_sp);
1520 // Similar to above but see if current stackpoint is out of the guard area
1521 // and reguard if possible.
1522 bool reguard_stack(void);
1523
1524 address stack_overflow_limit() { return _stack_overflow_limit; }
1525 void set_stack_overflow_limit() {
1526 _stack_overflow_limit =
1527 stack_end() + MAX2(JavaThread::stack_guard_zone_size(), JavaThread::stack_shadow_zone_size());
1528 }
1529
1530 // Misc. accessors/mutators
1531 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1532 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1533 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1534
1535 #ifndef PRODUCT
1536 void record_jump(address target, address instr, const char* file, int line);
1537 #endif // PRODUCT
1538
1539 // For assembly stub generation
1540 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1541 #ifndef PRODUCT
1542 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1543 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1544 #endif // PRODUCT
1545 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1546 static ByteSize pending_jni_exception_check_fn_offset() {
1547 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn);
1548 }
1549 static ByteSize last_Java_sp_offset() {
1550 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1551 }
1552 static ByteSize last_Java_pc_offset() {
1553 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1554 }
1555 static ByteSize frame_anchor_offset() {
1556 return byte_offset_of(JavaThread, _anchor);
1557 }
1558 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1559 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1560 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1561 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1562 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1563 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1564 #if INCLUDE_JVMCI
1565 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
1566 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
1567 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); }
1568 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
1569 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
1570 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
1571 #endif // INCLUDE_JVMCI
1572 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1573 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1574 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1575 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1576 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1577 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1578 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); }
1579 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1580
1581 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1582 static ByteSize should_post_on_exceptions_flag_offset() {
1583 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1584 }
1585
1586 #if INCLUDE_ALL_GCS
1587 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1588 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1589 #endif // INCLUDE_ALL_GCS
1590
1591 // Returns the jni environment for this thread
1592 JNIEnv* jni_environment() { return &_jni_environment; }
1593
1594 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1595 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1596 // Only return NULL if thread is off the thread list; starting to
1597 // exit should not return NULL.
1598 if (thread_from_jni_env->is_terminated()) {
1599 thread_from_jni_env->block_if_vm_exited();
1600 return NULL;
1601 } else {
1602 return thread_from_jni_env;
1603 }
1604 }
1605
1606 // JNI critical regions. These can nest.
1607 bool in_critical() { return _jni_active_critical > 0; }
1608 bool in_last_critical() { return _jni_active_critical == 1; }
1609 void enter_critical() {
1610 assert(Thread::current() == this ||
1611 (Thread::current()->is_VM_thread() &&
1612 SafepointSynchronize::is_synchronizing()),
1613 "this must be current thread or synchronizing");
1614 _jni_active_critical++;
1615 }
1616 void exit_critical() {
1617 assert(Thread::current() == this, "this must be current thread");
1618 _jni_active_critical--;
1619 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1620 }
1621
1622 // Checked JNI: is the programmer required to check for exceptions, if so specify
1623 // which function name. Returning to a Java frame should implicitly clear the
1624 // pending check, this is done for Native->Java transitions (i.e. user JNI code).
1625 // VM->Java transistions are not cleared, it is expected that JNI code enclosed
1626 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal).
1627 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1628 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1629 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1630 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1631
1632 // For deadlock detection
1633 int depth_first_number() { return _depth_first_number; }
1634 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1635
1636 private:
1637 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1638
1639 public:
1640 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1641 void add_monitor_chunk(MonitorChunk* chunk);
1642 void remove_monitor_chunk(MonitorChunk* chunk);
1643 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1644 void inc_in_deopt_handler() { _in_deopt_handler++; }
1645 void dec_in_deopt_handler() {
1646 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1647 if (_in_deopt_handler > 0) { // robustness
1648 _in_deopt_handler--;
1649 }
1650 }
1651
1652 private:
1653 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1654
1655 public:
1656
1657 // Frame iteration; calls the function f for all frames on the stack
1658 void frames_do(void f(frame*, const RegisterMap*));
1659
1660 // Memory operations
1661 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1662
1663 // Sweeper operations
1664 virtual void nmethods_do(CodeBlobClosure* cf);
1665
1666 // RedefineClasses Support
1667 void metadata_do(void f(Metadata*));
1668
1669 // Misc. operations
1670 char* name() const { return (char*)get_thread_name(); }
1671 void print_on(outputStream* st) const;
1672 void print_value();
1673 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1674 void print_thread_state() const PRODUCT_RETURN;
1675 void print_on_error(outputStream* st, char* buf, int buflen) const;
1676 void print_name_on_error(outputStream* st, char* buf, int buflen) const;
1677 void verify();
1678 const char* get_thread_name() const;
1679 private:
1680 // factor out low-level mechanics for use in both normal and error cases
1681 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1682 public:
1683 const char* get_threadgroup_name() const;
1684 const char* get_parent_name() const;
1685
1686 // Accessing frames
1687 frame last_frame() {
1688 _anchor.make_walkable(this);
1689 return pd_last_frame();
1690 }
1691 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1692
1693 // Returns method at 'depth' java or native frames down the stack
1694 // Used for security checks
1695 Klass* security_get_caller_class(int depth);
1696
1697 // Print stack trace in external format
1698 void print_stack_on(outputStream* st);
1699 void print_stack() { print_stack_on(tty); }
1700
1701 // Print stack traces in various internal formats
1702 void trace_stack() PRODUCT_RETURN;
1703 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1704 void trace_frames() PRODUCT_RETURN;
1705 void trace_oops() PRODUCT_RETURN;
1706
1707 // Print an annotated view of the stack frames
1708 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1709 void validate_frame_layout() {
1710 print_frame_layout(0, true);
1711 }
1712
1713 // Returns the number of stack frames on the stack
1714 int depth() const;
1715
1716 // Function for testing deoptimization
1717 void deoptimize();
1718 void make_zombies();
1719
1720 void deoptimized_wrt_marked_nmethods();
1721
1722 // Profiling operation (see fprofile.cpp)
1723 public:
1724 bool profile_last_Java_frame(frame* fr);
1725
1726 private:
1727 ThreadProfiler* _thread_profiler;
1728 private:
1729 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1730 friend class FlatProfilerTask; // uses get_thread_profiler.
1731 friend class ThreadProfilerMark; // uses get_thread_profiler.
1732 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1733 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1734 ThreadProfiler* result = _thread_profiler;
1735 _thread_profiler = tp;
1736 return result;
1737 }
1738
1739 public:
1740 // Returns the running thread as a JavaThread
1741 static inline JavaThread* current();
1742
1743 // Returns the active Java thread. Do not use this if you know you are calling
1744 // from a JavaThread, as it's slower than JavaThread::current. If called from
1745 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1746 // operation. You may not want that either.
1747 static JavaThread* active();
1748
1749 inline CompilerThread* as_CompilerThread();
1750
1751 public:
1752 virtual void run();
1753 void thread_main_inner();
1754
1755 private:
1756 // PRIVILEGED STACK
1757 PrivilegedElement* _privileged_stack_top;
1758 GrowableArray<oop>* _array_for_gc;
1759 public:
1760
1761 // Returns the privileged_stack information.
1762 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1763 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1764 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1765
1766 public:
1767 // Thread local information maintained by JVMTI.
1768 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1769 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1770 // getter is used to get this JavaThread's JvmtiThreadState if it has
1771 // one which means NULL can be returned. JvmtiThreadState::state_for()
1772 // is used to get the specified JavaThread's JvmtiThreadState if it has
1773 // one or it allocates a new JvmtiThreadState for the JavaThread and
1774 // returns it. JvmtiThreadState::state_for() will return NULL only if
1775 // the specified JavaThread is exiting.
1776 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1777 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1778 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1779 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1780
1781 // JVMTI PopFrame support
1782 // Setting and clearing popframe_condition
1783 // All of these enumerated values are bits. popframe_pending
1784 // indicates that a PopFrame() has been requested and not yet been
1785 // completed. popframe_processing indicates that that PopFrame() is in
1786 // the process of being completed. popframe_force_deopt_reexecution_bit
1787 // indicates that special handling is required when returning to a
1788 // deoptimized caller.
1789 enum PopCondition {
1790 popframe_inactive = 0x00,
1791 popframe_pending_bit = 0x01,
1792 popframe_processing_bit = 0x02,
1793 popframe_force_deopt_reexecution_bit = 0x04
1794 };
1795 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1796 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1797 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1798 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1799 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1800 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1801 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1802 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1803 #ifdef CC_INTERP
1804 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1805 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1806 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1807 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1808 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1809 #endif
1810
1811 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1812 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1813 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1814
1815 private:
1816 // Saved incoming arguments to popped frame.
1817 // Used only when popped interpreted frame returns to deoptimized frame.
1818 void* _popframe_preserved_args;
1819 int _popframe_preserved_args_size;
1820
1821 public:
1822 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1823 void* popframe_preserved_args();
1824 ByteSize popframe_preserved_args_size();
1825 WordSize popframe_preserved_args_size_in_words();
1826 void popframe_free_preserved_args();
1827
1828
1829 private:
1830 JvmtiThreadState *_jvmti_thread_state;
1831 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1832
1833 // Used by the interpreter in fullspeed mode for frame pop, method
1834 // entry, method exit and single stepping support. This field is
1835 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1836 // It can be set to zero asynchronously (i.e., without a VM operation
1837 // or a lock) so we have to be very careful.
1838 int _interp_only_mode;
1839
1840 public:
1841 // used by the interpreter for fullspeed debugging support (see above)
1842 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1843 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1844 int get_interp_only_mode() { return _interp_only_mode; }
1845 void increment_interp_only_mode() { ++_interp_only_mode; }
1846 void decrement_interp_only_mode() { --_interp_only_mode; }
1847
1848 // support for cached flag that indicates whether exceptions need to be posted for this thread
1849 // if this is false, we can avoid deoptimizing when events are thrown
1850 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1851 private:
1852 int _should_post_on_exceptions_flag;
1853
1854 public:
1855 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1856 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1857
1858 private:
1859 ThreadStatistics *_thread_stat;
1860
1861 public:
1862 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1863
1864 // Return a blocker object for which this thread is blocked parking.
1865 oop current_park_blocker();
1866
1867 private:
1868 static size_t _stack_size_at_create;
1869
1870 public:
1871 static inline size_t stack_size_at_create(void) {
1872 return _stack_size_at_create;
1873 }
1874 static inline void set_stack_size_at_create(size_t value) {
1875 _stack_size_at_create = value;
1876 }
1877
1878 #if INCLUDE_ALL_GCS
1879 // SATB marking queue support
1880 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; }
1881 static SATBMarkQueueSet& satb_mark_queue_set() {
1882 return _satb_mark_queue_set;
1883 }
1884
1885 // Dirty card queue support
1886 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1887 static DirtyCardQueueSet& dirty_card_queue_set() {
1888 return _dirty_card_queue_set;
1889 }
1890 #endif // INCLUDE_ALL_GCS
1891
1892 // This method initializes the SATB and dirty card queues before a
1893 // JavaThread is added to the Java thread list. Right now, we don't
1894 // have to do anything to the dirty card queue (it should have been
1895 // activated when the thread was created), but we have to activate
1896 // the SATB queue if the thread is created while a marking cycle is
1897 // in progress. The activation / de-activation of the SATB queues at
1898 // the beginning / end of a marking cycle is done during safepoints
1899 // so we have to make sure this method is called outside one to be
1900 // able to safely read the active field of the SATB queue set. Right
1901 // now, it is called just before the thread is added to the Java
1902 // thread list in the Threads::add() method. That method is holding
1903 // the Threads_lock which ensures we are outside a safepoint. We
1904 // cannot do the obvious and set the active field of the SATB queue
1905 // when the thread is created given that, in some cases, safepoints
1906 // might happen between the JavaThread constructor being called and the
1907 // thread being added to the Java thread list (an example of this is
1908 // when the structure for the DestroyJavaVM thread is created).
1909 #if INCLUDE_ALL_GCS
1910 void initialize_queues();
1911 #else // INCLUDE_ALL_GCS
1912 void initialize_queues() { }
1913 #endif // INCLUDE_ALL_GCS
1914
1915 // Machine dependent stuff
1916 #include OS_CPU_HEADER(thread)
1917
1918 public:
1919 void set_blocked_on_compilation(bool value) {
1920 _blocked_on_compilation = value;
1921 }
1922
1923 bool blocked_on_compilation() {
1924 return _blocked_on_compilation;
1925 }
1926 protected:
1927 bool _blocked_on_compilation;
1928
1929
1930 // JSR166 per-thread parker
1931 private:
1932 Parker* _parker;
1933 public:
1934 Parker* parker() { return _parker; }
1935
1936 // Biased locking support
1937 private:
1938 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1939 public:
1940 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1941 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1942
1943 // clearing/querying jni attach status
1944 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1945 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1946 inline void set_done_attaching_via_jni();
1947 };
1948
1949 // Inline implementation of JavaThread::current
1950 inline JavaThread* JavaThread::current() {
1951 Thread* thread = Thread::current();
1952 assert(thread->is_Java_thread(), "just checking");
1953 return (JavaThread*)thread;
1954 }
1955
1956 inline CompilerThread* JavaThread::as_CompilerThread() {
1957 assert(is_Compiler_thread(), "just checking");
1958 return (CompilerThread*)this;
1959 }
1960
1961 // Dedicated thread to sweep the code cache
1962 class CodeCacheSweeperThread : public JavaThread {
1963 CompiledMethod* _scanned_compiled_method; // nmethod being scanned by the sweeper
1964 public:
1965 CodeCacheSweeperThread();
1966 // Track the nmethod currently being scanned by the sweeper
1967 void set_scanned_compiled_method(CompiledMethod* cm) {
1968 assert(_scanned_compiled_method == NULL || cm == NULL, "should reset to NULL before writing a new value");
1969 _scanned_compiled_method = cm;
1970 }
1971
1972 // Hide sweeper thread from external view.
1973 bool is_hidden_from_external_view() const { return true; }
1974
1975 bool is_Code_cache_sweeper_thread() const { return true; }
1976
1977 // Prevent GC from unloading _scanned_compiled_method
1978 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1979 void nmethods_do(CodeBlobClosure* cf);
1980 };
1981
1982 // A thread used for Compilation.
1983 class CompilerThread : public JavaThread {
1984 friend class VMStructs;
1985 private:
1986 CompilerCounters* _counters;
1987
1988 ciEnv* _env;
1989 CompileLog* _log;
1990 CompileTask* _task;
1991 CompileQueue* _queue;
1992 BufferBlob* _buffer_blob;
1993
1994 AbstractCompiler* _compiler;
1995
1996 public:
1997
1998 static CompilerThread* current();
1999
2000 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
2001
2002 bool is_Compiler_thread() const { return true; }
2003
2004 virtual bool can_call_java() const;
2005
2006 // Hide native compiler threads from external view.
2007 bool is_hidden_from_external_view() const { return !can_call_java(); }
2008
2009 void set_compiler(AbstractCompiler* c) { _compiler = c; }
2010 AbstractCompiler* compiler() const { return _compiler; }
2011
2012 CompileQueue* queue() const { return _queue; }
2013 CompilerCounters* counters() const { return _counters; }
2014
2015 // Get/set the thread's compilation environment.
2016 ciEnv* env() { return _env; }
2017 void set_env(ciEnv* env) { _env = env; }
2018
2019 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
2020 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
2021
2022 // Get/set the thread's logging information
2023 CompileLog* log() { return _log; }
2024 void init_log(CompileLog* log) {
2025 // Set once, for good.
2026 assert(_log == NULL, "set only once");
2027 _log = log;
2028 }
2029
2030 #ifndef PRODUCT
2031 private:
2032 IdealGraphPrinter *_ideal_graph_printer;
2033 public:
2034 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
2035 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
2036 #endif
2037
2038 // Get/set the thread's current task
2039 CompileTask* task() { return _task; }
2040 void set_task(CompileTask* task) { _task = task; }
2041 };
2042
2043 inline CompilerThread* CompilerThread::current() {
2044 return JavaThread::current()->as_CompilerThread();
2045 }
2046
2047 // The active thread queue. It also keeps track of the current used
2048 // thread priorities.
2049 class Threads: AllStatic {
2050 friend class VMStructs;
2051 private:
2052 static JavaThread* _thread_list;
2053 static int _number_of_threads;
2054 static int _number_of_non_daemon_threads;
2055 static int _return_code;
2056 static int _thread_claim_parity;
2057 #ifdef ASSERT
2058 static bool _vm_complete;
2059 #endif
2060
2061 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
2062 static void initialize_jsr292_core_classes(TRAPS);
2063 public:
2064 // Thread management
2065 // force_daemon is a concession to JNI, where we may need to add a
2066 // thread to the thread list before allocating its thread object
2067 static void add(JavaThread* p, bool force_daemon = false);
2068 static void remove(JavaThread* p);
2069 static bool includes(JavaThread* p);
2070 static JavaThread* first() { return _thread_list; }
2071 static void threads_do(ThreadClosure* tc);
2072 static void parallel_java_threads_do(ThreadClosure* tc);
2073
2074 // Initializes the vm and creates the vm thread
2075 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
2076 static void convert_vm_init_libraries_to_agents();
2077 static void create_vm_init_libraries();
2078 static void create_vm_init_agents();
2079 static void shutdown_vm_agents();
2080 static bool destroy_vm();
2081 // Supported VM versions via JNI
2082 // Includes JNI_VERSION_1_1
2083 static jboolean is_supported_jni_version_including_1_1(jint version);
2084 // Does not include JNI_VERSION_1_1
2085 static jboolean is_supported_jni_version(jint version);
2086
2087 // The "thread claim parity" provides a way for threads to be claimed
2088 // by parallel worker tasks.
2089 //
2090 // Each thread contains a a "parity" field. A task will claim the
2091 // thread only if its parity field is the same as the global parity,
2092 // which is updated by calling change_thread_claim_parity().
2093 //
2094 // For this to work change_thread_claim_parity() needs to be called
2095 // exactly once in sequential code before starting parallel tasks
2096 // that should claim threads.
2097 //
2098 // New threads get their parity set to 0 and change_thread_claim_parity()
2099 // never set the global parity to 0.
2100 static int thread_claim_parity() { return _thread_claim_parity; }
2101 static void change_thread_claim_parity();
2102 static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
2103
2104 // Apply "f->do_oop" to all root oops in all threads.
2105 // This version may only be called by sequential code.
2106 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
2107 // This version may be called by sequential or parallel code.
2108 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf);
2109 // This creates a list of GCTasks, one per thread.
2110 static void create_thread_roots_tasks(GCTaskQueue* q);
2111 // This creates a list of GCTasks, one per thread, for marking objects.
2112 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
2113
2114 // Apply "f->do_oop" to roots in all threads that
2115 // are part of compiled frames
2116 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
2117
2118 static void convert_hcode_pointers();
2119 static void restore_hcode_pointers();
2120
2121 // Sweeper
2122 static void nmethods_do(CodeBlobClosure* cf);
2123
2124 // RedefineClasses support
2125 static void metadata_do(void f(Metadata*));
2126 static void metadata_handles_do(void f(Metadata*));
2127
2128 #ifdef ASSERT
2129 static bool is_vm_complete() { return _vm_complete; }
2130 #endif
2131
2132 // Verification
2133 static void verify();
2134 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
2135 static void print(bool print_stacks, bool internal_format) {
2136 // this function is only used by debug.cpp
2137 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
2138 }
2139 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2140 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf,
2141 int buflen, bool* found_current);
2142 static void print_threads_compiling(outputStream* st, char* buf, int buflen);
2143
2144 // Get Java threads that are waiting to enter a monitor. If doLock
2145 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2146 // VM needs to be at a safepoint.
2147 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2148 address monitor, bool doLock);
2149
2150 // Get owning Java thread from the monitor's owner field. If doLock
2151 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2152 // VM needs to be at a safepoint.
2153 static JavaThread *owning_thread_from_monitor_owner(address owner,
2154 bool doLock);
2155
2156 // Number of threads on the active threads list
2157 static int number_of_threads() { return _number_of_threads; }
2158 // Number of non-daemon threads on the active threads list
2159 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2160
2161 // Deoptimizes all frames tied to marked nmethods
2162 static void deoptimized_wrt_marked_nmethods();
2163
2164 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2165
2166 };
2167
2168
2169 // Thread iterator
2170 class ThreadClosure: public StackObj {
2171 public:
2172 virtual void do_thread(Thread* thread) = 0;
2173 };
2174
2175 class SignalHandlerMark: public StackObj {
2176 private:
2177 Thread* _thread;
2178 public:
2179 SignalHandlerMark(Thread* t) {
2180 _thread = t;
2181 if (_thread) _thread->enter_signal_handler();
2182 }
2183 ~SignalHandlerMark() {
2184 if (_thread) _thread->leave_signal_handler();
2185 _thread = NULL;
2186 }
2187 };
2188
2189
2190 #endif // SHARE_VM_RUNTIME_THREAD_HPP