1 /*
2 * Copyright (c) 1997, 2016, 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 #if INCLUDE_ALL_GCS
50 #include "gc/g1/dirtyCardQueue.hpp"
51 #include "gc/g1/satbMarkQueue.hpp"
52 #endif // INCLUDE_ALL_GCS
53 #ifdef ZERO
54 # include "stack_zero.hpp"
55 #endif
56
57 class ThreadSafepointState;
58 class ThreadProfiler;
59
60 class JvmtiThreadState;
61 class JvmtiGetLoadedClassesClosure;
62 class ThreadStatistics;
63 class ConcurrentLocksDump;
64 class ParkEvent;
65 class Parker;
66
67 class ciEnv;
68 class CompileThread;
69 class CompileLog;
70 class CompileTask;
71 class CompileQueue;
72 class CompilerCounters;
73 class vframeArray;
74
75 class DeoptResourceMark;
76 class jvmtiDeferredLocalVariableSet;
77
78 class ThreadClosure;
79 class IdealGraphPrinter;
80
81 class Metadata;
82 template <class T, MEMFLAGS F> class ChunkedList;
83 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
84
85 DEBUG_ONLY(class ResourceMark;)
86
87 class WorkerThread;
88
89 // Class hierarchy
90 // - Thread
91 // - NamedThread
92 // - VMThread
93 // - ConcurrentGCThread
94 // - WorkerThread
95 // - GangWorker
96 // - GCTaskThread
97 // - JavaThread
98 // - various subclasses eg CompilerThread, ServiceThread
99 // - WatcherThread
100
101 class Thread: public ThreadShadow {
102 friend class VMStructs;
103 friend class JVMCIVMStructs;
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 NoSafepointVerifier 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 NoAllocVerifier;
267 friend class NoSafepointVerifier;
268 friend class PauseNoSafepointVerifier;
269 friend class GCLocker;
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 void clear_thread_current(); // TLS cleanup needed before threads terminate
318
319 public:
320 // thread entry point
321 virtual void run();
322
323 // Testers
324 virtual bool is_VM_thread() const { return false; }
325 virtual bool is_Java_thread() const { return false; }
326 virtual bool is_Compiler_thread() const { return false; }
327 virtual bool is_Code_cache_sweeper_thread() const { return false; }
328 virtual bool is_hidden_from_external_view() const { return false; }
329 virtual bool is_jvmti_agent_thread() const { return false; }
330 // True iff the thread can perform GC operations at a safepoint.
331 // Generally will be true only of VM thread and parallel GC WorkGang
332 // threads.
333 virtual bool is_GC_task_thread() const { return false; }
334 virtual bool is_Watcher_thread() const { return false; }
335 virtual bool is_ConcurrentGC_thread() const { return false; }
336 virtual bool is_Named_thread() const { return false; }
337 virtual bool is_Worker_thread() const { return false; }
338
339 // Can this thread make Java upcalls
340 virtual bool can_call_java() const { return false; }
341
342 // Casts
343 virtual WorkerThread* as_Worker_thread() const { return NULL; }
344
345 virtual char* name() const { return (char*)"Unknown thread"; }
346
347 // Returns the current thread (ASSERTS if NULL)
348 static inline Thread* current();
349 // Returns the current thread, or NULL if not attached
350 static inline Thread* current_or_null();
351 // Returns the current thread, or NULL if not attached, and is
352 // safe for use from signal-handlers
353 static inline Thread* current_or_null_safe();
354
355 // Common thread operations
356 static void set_priority(Thread* thread, ThreadPriority priority);
357 static ThreadPriority get_priority(const Thread* const thread);
358 static void start(Thread* thread);
359 static void interrupt(Thread* thr);
360 static bool is_interrupted(Thread* thr, bool clear_interrupted);
361
362 void set_native_thread_name(const char *name) {
363 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
364 os::set_native_thread_name(name);
365 }
366
367 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
368 Monitor* SR_lock() const { return _SR_lock; }
369
370 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
371
372 inline void set_suspend_flag(SuspendFlags f);
373 inline void clear_suspend_flag(SuspendFlags f);
374
375 inline void set_has_async_exception();
376 inline void clear_has_async_exception();
377
378 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
379
380 inline void set_critical_native_unlock();
381 inline void clear_critical_native_unlock();
382
383 // Support for Unhandled Oop detection
384 // Add the field for both, fastdebug and debug, builds to keep
385 // Thread's fields layout the same.
386 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build.
387 #ifdef CHECK_UNHANDLED_OOPS
388 private:
389 UnhandledOops* _unhandled_oops;
390 #elif defined(ASSERT)
391 private:
392 void* _unhandled_oops;
393 #endif
394 #ifdef CHECK_UNHANDLED_OOPS
395 public:
396 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
397 // Mark oop safe for gc. It may be stack allocated but won't move.
398 void allow_unhandled_oop(oop *op) {
399 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
400 }
401 // Clear oops at safepoint so crashes point to unhandled oop violator
402 void clear_unhandled_oops() {
403 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
404 }
405 #endif // CHECK_UNHANDLED_OOPS
406
407 public:
408 #ifndef PRODUCT
409 bool skip_gcalot() { return _skip_gcalot; }
410 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
411 #endif
412
413 // Installs a pending exception to be inserted later
414 static void send_async_exception(oop thread_oop, oop java_throwable);
415
416 // Resource area
417 ResourceArea* resource_area() const { return _resource_area; }
418 void set_resource_area(ResourceArea* area) { _resource_area = area; }
419
420 OSThread* osthread() const { return _osthread; }
421 void set_osthread(OSThread* thread) { _osthread = thread; }
422
423 // JNI handle support
424 JNIHandleBlock* active_handles() const { return _active_handles; }
425 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
426 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
427 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
428
429 // Internal handle support
430 HandleArea* handle_area() const { return _handle_area; }
431 void set_handle_area(HandleArea* area) { _handle_area = area; }
432
433 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
434 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
435
436 // Thread-Local Allocation Buffer (TLAB) support
437 ThreadLocalAllocBuffer& tlab() { return _tlab; }
438 void initialize_tlab() {
439 if (UseTLAB) {
440 tlab().initialize();
441 }
442 }
443
444 jlong allocated_bytes() { return _allocated_bytes; }
445 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
446 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
447 inline jlong cooked_allocated_bytes();
448
449 TRACE_DEFINE_THREAD_TRACE_DATA_OFFSET;
450 TRACE_DATA* trace_data() const { 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 // Used by JavaThread::oops_do.
485 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
486 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf);
487
488 // Handles the parallel case for the method below.
489 private:
490 bool claim_oops_do_par_case(int collection_parity);
491 public:
492 // Requires that "collection_parity" is that of the current roots
493 // iteration. If "is_par" is false, sets the parity of "this" to
494 // "collection_parity", and returns "true". If "is_par" is true,
495 // uses an atomic instruction to set the current threads parity to
496 // "collection_parity", if it is not already. Returns "true" iff the
497 // calling thread does the update, this indicates that the calling thread
498 // has claimed the thread's stack as a root groop in the current
499 // collection.
500 bool claim_oops_do(bool is_par, int collection_parity) {
501 if (!is_par) {
502 _oops_do_parity = collection_parity;
503 return true;
504 } else {
505 return claim_oops_do_par_case(collection_parity);
506 }
507 }
508
509 // jvmtiRedefineClasses support
510 void metadata_handles_do(void f(Metadata*));
511
512 // Used by fast lock support
513 virtual bool is_lock_owned(address adr) const;
514
515 // Check if address is in the stack of the thread (not just for locks).
516 // Warning: the method can only be used on the running thread
517 bool is_in_stack(address adr) const;
518 // Check if address is in the usable part of the stack (excludes protected
519 // guard pages)
520 bool is_in_usable_stack(address adr) const;
521
522 // Sets this thread as starting thread. Returns failure if thread
523 // creation fails due to lack of memory, too many threads etc.
524 bool set_as_starting_thread();
525
526 protected:
527 // OS data associated with the thread
528 OSThread* _osthread; // Platform-specific thread information
529
530 // Thread local resource area for temporary allocation within the VM
531 ResourceArea* _resource_area;
532
533 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
534
535 // Thread local handle area for allocation of handles within the VM
536 HandleArea* _handle_area;
537 GrowableArray<Metadata*>* _metadata_handles;
538
539 // Support for stack overflow handling, get_thread, etc.
540 address _stack_base;
541 size_t _stack_size;
542 uintptr_t _self_raw_id; // used by get_thread (mutable)
543 int _lgrp_id;
544
545 public:
546 // Stack overflow support
547 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
548 void set_stack_base(address base) { _stack_base = base; }
549 size_t stack_size() const { return _stack_size; }
550 void set_stack_size(size_t size) { _stack_size = size; }
551 address stack_end() const { return stack_base() - stack_size(); }
552 void record_stack_base_and_size();
553
554 bool on_local_stack(address adr) const {
555 // QQQ this has knowledge of direction, ought to be a stack method
556 return (_stack_base >= adr && adr >= stack_end());
557 }
558
559 uintptr_t self_raw_id() { return _self_raw_id; }
560 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
561
562 int lgrp_id() const { return _lgrp_id; }
563 void set_lgrp_id(int value) { _lgrp_id = value; }
564
565 // Printing
566 virtual void print_on(outputStream* st) const;
567 void print() const { print_on(tty); }
568 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
569
570 // Debug-only code
571 #ifdef ASSERT
572 private:
573 // Deadlock detection support for Mutex locks. List of locks own by thread.
574 Monitor* _owned_locks;
575 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
576 // thus the friendship
577 friend class Mutex;
578 friend class Monitor;
579
580 public:
581 void print_owned_locks_on(outputStream* st) const;
582 void print_owned_locks() const { print_owned_locks_on(tty); }
583 Monitor* owned_locks() const { return _owned_locks; }
584 bool owns_locks() const { return owned_locks() != NULL; }
585 bool owns_locks_but_compiled_lock() const;
586 int oops_do_parity() const { return _oops_do_parity; }
587
588 // Deadlock detection
589 bool allow_allocation() { return _allow_allocation_count == 0; }
590 ResourceMark* current_resource_mark() { return _current_resource_mark; }
591 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
592 #endif
593
594 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
595
596 private:
597 volatile int _jvmti_env_iteration_count;
598
599 public:
600 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
601 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
602 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
603
604 // Code generation
605 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
606 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
607 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
608
609 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
610 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
611
612 #define TLAB_FIELD_OFFSET(name) \
613 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
614
615 TLAB_FIELD_OFFSET(start)
616 TLAB_FIELD_OFFSET(end)
617 TLAB_FIELD_OFFSET(top)
618 TLAB_FIELD_OFFSET(pf_top)
619 TLAB_FIELD_OFFSET(size) // desired_size
620 TLAB_FIELD_OFFSET(refill_waste_limit)
621 TLAB_FIELD_OFFSET(number_of_refills)
622 TLAB_FIELD_OFFSET(fast_refill_waste)
623 TLAB_FIELD_OFFSET(slow_allocations)
624
625 #undef TLAB_FIELD_OFFSET
626
627 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
628
629 public:
630 volatile intptr_t _Stalled;
631 volatile int _TypeTag;
632 ParkEvent * _ParkEvent; // for synchronized()
633 ParkEvent * _SleepEvent; // for Thread.sleep
634 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
635 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
636 int NativeSyncRecursion; // diagnostic
637
638 volatile int _OnTrap; // Resume-at IP delta
639 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
640 jint _hashStateX; // thread-specific hashCode generator state
641 jint _hashStateY;
642 jint _hashStateZ;
643 void * _schedctl;
644
645
646 volatile jint rng[4]; // RNG for spin loop
647
648 // Low-level leaf-lock primitives used to implement synchronization
649 // and native monitor-mutex infrastructure.
650 // Not for general synchronization use.
651 static void SpinAcquire(volatile int * Lock, const char * Name);
652 static void SpinRelease(volatile int * Lock);
653 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
654 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
655 static void muxRelease(volatile intptr_t * Lock);
656 };
657
658 // Inline implementation of Thread::current()
659 inline Thread* Thread::current() {
660 Thread* current = current_or_null();
661 assert(current != NULL, "Thread::current() called on detached thread");
662 return current;
663 }
664
665 inline Thread* Thread::current_or_null() {
666 #ifndef USE_LIBRARY_BASED_TLS_ONLY
667 return _thr_current;
668 #else
669 return ThreadLocalStorage::thread();
670 #endif
671 }
672
673 inline Thread* Thread::current_or_null_safe() {
674 return ThreadLocalStorage::thread();
675 }
676
677 // Name support for threads. non-JavaThread subclasses with multiple
678 // uniquely named instances should derive from this.
679 class NamedThread: public Thread {
680 friend class VMStructs;
681 enum {
682 max_name_len = 64
683 };
684 private:
685 char* _name;
686 // log JavaThread being processed by oops_do
687 JavaThread* _processed_thread;
688 uint _gc_id; // The current GC id when a thread takes part in GC
689
690 public:
691 NamedThread();
692 ~NamedThread();
693 // May only be called once per thread.
694 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
695 void initialize_named_thread();
696 virtual bool is_Named_thread() const { return true; }
697 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
698 JavaThread *processed_thread() { return _processed_thread; }
699 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
700 virtual void print_on(outputStream* st) const;
701
702 void set_gc_id(uint gc_id) { _gc_id = gc_id; }
703 uint gc_id() { return _gc_id; }
704 };
705
706 // Worker threads are named and have an id of an assigned work.
707 class WorkerThread: public NamedThread {
708 private:
709 uint _id;
710 public:
711 WorkerThread() : _id(0) { }
712 virtual bool is_Worker_thread() const { return true; }
713
714 virtual WorkerThread* as_Worker_thread() const {
715 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
716 return (WorkerThread*) this;
717 }
718
719 void set_id(uint work_id) { _id = work_id; }
720 uint id() const { return _id; }
721 };
722
723 // A single WatcherThread is used for simulating timer interrupts.
724 class WatcherThread: public Thread {
725 friend class VMStructs;
726 public:
727 virtual void run();
728
729 private:
730 static WatcherThread* _watcher_thread;
731
732 static bool _startable;
733 // volatile due to at least one lock-free read
734 volatile static bool _should_terminate;
735
736 os::WatcherThreadCrashProtection* _crash_protection;
737 public:
738 enum SomeConstants {
739 delay_interval = 10 // interrupt delay in milliseconds
740 };
741
742 // Constructor
743 WatcherThread();
744
745 // No destruction allowed
746 ~WatcherThread() {
747 guarantee(false, "WatcherThread deletion must fix the race with VM termination");
748 }
749
750 // Tester
751 bool is_Watcher_thread() const { return true; }
752
753 // Printing
754 char* name() const { return (char*)"VM Periodic Task Thread"; }
755 void print_on(outputStream* st) const;
756 void unpark();
757
758 // Returns the single instance of WatcherThread
759 static WatcherThread* watcher_thread() { return _watcher_thread; }
760
761 // Create and start the single instance of WatcherThread, or stop it on shutdown
762 static void start();
763 static void stop();
764 // Only allow start once the VM is sufficiently initialized
765 // Otherwise the first task to enroll will trigger the start
766 static void make_startable();
767
768 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
769 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
770 _crash_protection = crash_protection;
771 }
772
773 bool has_crash_protection() const { return _crash_protection != NULL; }
774 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
775
776 private:
777 int sleep() const;
778 };
779
780
781 class CompilerThread;
782
783 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
784
785 class JavaThread: public Thread {
786 friend class VMStructs;
787 friend class JVMCIVMStructs;
788 friend class WhiteBox;
789 private:
790 JavaThread* _next; // The next thread in the Threads list
791 oop _threadObj; // The Java level thread object
792
793 #ifdef ASSERT
794 private:
795 int _java_call_counter;
796
797 public:
798 int java_call_counter() { return _java_call_counter; }
799 void inc_java_call_counter() { _java_call_counter++; }
800 void dec_java_call_counter() {
801 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
802 _java_call_counter--;
803 }
804 private: // restore original namespace restriction
805 #endif // ifdef ASSERT
806
807 #ifndef PRODUCT
808 public:
809 enum {
810 jump_ring_buffer_size = 16
811 };
812 private: // restore original namespace restriction
813 #endif
814
815 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
816
817 ThreadFunction _entry_point;
818
819 JNIEnv _jni_environment;
820
821 // Deopt support
822 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
823
824 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
825 // transition out of native
826 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized
827 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
828 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
829 // Because deoptimization is lazy we must save jvmti requests to set locals
830 // in compiled frames until we deoptimize and we have an interpreter frame.
831 // This holds the pointer to array (yeah like there might be more than one) of
832 // description of compiled vframes that have locals that need to be updated.
833 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
834
835 // Handshake value for fixing 6243940. We need a place for the i2c
836 // adapter to store the callee Method*. This value is NEVER live
837 // across a gc point so it does NOT have to be gc'd
838 // The handshake is open ended since we can't be certain that it will
839 // be NULLed. This is because we rarely ever see the race and end up
840 // in handle_wrong_method which is the backend of the handshake. See
841 // code in i2c adapters and handle_wrong_method.
842
843 Method* _callee_target;
844
845 // Used to pass back results to the interpreter or generated code running Java code.
846 oop _vm_result; // oop result is GC-preserved
847 Metadata* _vm_result_2; // non-oop result
848
849 // See ReduceInitialCardMarks: this holds the precise space interval of
850 // the most recent slow path allocation for which compiled code has
851 // elided card-marks for performance along the fast-path.
852 MemRegion _deferred_card_mark;
853
854 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
855 // allocated during deoptimization
856 // and by JNI_MonitorEnter/Exit
857
858 // Async. requests support
859 enum AsyncRequests {
860 _no_async_condition = 0,
861 _async_exception,
862 _async_unsafe_access_error
863 };
864 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
865 oop _pending_async_exception;
866
867 // Safepoint support
868 public: // Expose _thread_state for SafeFetchInt()
869 volatile JavaThreadState _thread_state;
870 private:
871 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
872 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
873
874 // JavaThread termination support
875 enum TerminatedTypes {
876 _not_terminated = 0xDEAD - 2,
877 _thread_exiting, // JavaThread::exit() has been called for this thread
878 _thread_terminated, // JavaThread is removed from thread list
879 _vm_exited // JavaThread is still executing native code, but VM is terminated
880 // only VM_Exit can set _vm_exited
881 };
882
883 // In general a JavaThread's _terminated field transitions as follows:
884 //
885 // _not_terminated => _thread_exiting => _thread_terminated
886 //
887 // _vm_exited is a special value to cover the case of a JavaThread
888 // executing native code after the VM itself is terminated.
889 volatile TerminatedTypes _terminated;
890 // suspend/resume support
891 volatile bool _suspend_equivalent; // Suspend equivalent condition
892 jint _in_deopt_handler; // count of deoptimization
893 // handlers thread is in
894 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
895 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
896 // never locked) when throwing an exception. Used by interpreter only.
897
898 // JNI attach states:
899 enum JNIAttachStates {
900 _not_attaching_via_jni = 1, // thread is not attaching via JNI
901 _attaching_via_jni, // thread is attaching via JNI
902 _attached_via_jni // thread has attached via JNI
903 };
904
905 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
906 // A native thread that is attaching via JNI starts with a value
907 // of _attaching_via_jni and transitions to _attached_via_jni.
908 volatile JNIAttachStates _jni_attach_state;
909
910 public:
911 // State of the stack guard pages for this thread.
912 enum StackGuardState {
913 stack_guard_unused, // not needed
914 stack_guard_reserved_disabled,
915 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow
916 stack_guard_enabled // enabled
917 };
918
919 private:
920
921 #if INCLUDE_JVMCI
922 // The _pending_* fields below are used to communicate extra information
923 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
924
925 // Communicates the DeoptReason and DeoptAction of the uncommon trap
926 int _pending_deoptimization;
927
928 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
929 // before the monitor has been acquired.
930 bool _pending_monitorenter;
931
932 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
933 bool _pending_transfer_to_interpreter;
934
935 // Guard for re-entrant call to JVMCIRuntime::adjust_comp_level
936 bool _adjusting_comp_level;
937
938 // An object that JVMCI compiled code can use to further describe and
939 // uniquely identify the speculative optimization guarded by the uncommon trap
940 oop _pending_failed_speculation;
941
942 // These fields are mutually exclusive in terms of live ranges.
943 union {
944 // Communicates the pc at which the most recent implicit exception occurred
945 // from the signal handler to a deoptimization stub.
946 address _implicit_exception_pc;
947
948 // Communicates an alternative call target to an i2c stub from a JavaCall .
949 address _alternate_call_target;
950 } _jvmci;
951
952 // Support for high precision, thread sensitive counters in JVMCI compiled code.
953 jlong* _jvmci_counters;
954
955 public:
956 static jlong* _jvmci_old_thread_counters;
957 static void collect_counters(typeArrayOop array);
958 private:
959 #endif // INCLUDE_JVMCI
960
961 StackGuardState _stack_guard_state;
962
963 // Precompute the limit of the stack as used in stack overflow checks.
964 // We load it from here to simplify the stack overflow check in assembly.
965 address _stack_overflow_limit;
966 address _reserved_stack_activation;
967
968 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
969 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
970 // code)
971 volatile oop _exception_oop; // Exception thrown in compiled code
972 volatile address _exception_pc; // PC where exception happened
973 volatile address _exception_handler_pc; // PC for handler of exception
974 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
975
976 private:
977 // support for JNI critical regions
978 jint _jni_active_critical; // count of entries into JNI critical region
979
980 // Checked JNI: function name requires exception check
981 char* _pending_jni_exception_check_fn;
982
983 // For deadlock detection.
984 int _depth_first_number;
985
986 // JVMTI PopFrame support
987 // This is set to popframe_pending to signal that top Java frame should be popped immediately
988 int _popframe_condition;
989
990 // If reallocation of scalar replaced objects fails, we throw OOM
991 // and during exception propagation, pop the top
992 // _frames_to_pop_failed_realloc frames, the ones that reference
993 // failed reallocations.
994 int _frames_to_pop_failed_realloc;
995
996 #ifndef PRODUCT
997 int _jmp_ring_index;
998 struct {
999 // We use intptr_t instead of address so debugger doesn't try and display strings
1000 intptr_t _target;
1001 intptr_t _instruction;
1002 const char* _file;
1003 int _line;
1004 } _jmp_ring[jump_ring_buffer_size];
1005 #endif // PRODUCT
1006
1007 #if INCLUDE_ALL_GCS
1008 // Support for G1 barriers
1009
1010 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier.
1011 // Set of all such queues.
1012 static SATBMarkQueueSet _satb_mark_queue_set;
1013
1014 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
1015 // Set of all such queues.
1016 static DirtyCardQueueSet _dirty_card_queue_set;
1017
1018 void flush_barrier_queues();
1019 #endif // INCLUDE_ALL_GCS
1020
1021 friend class VMThread;
1022 friend class ThreadWaitTransition;
1023 friend class VM_Exit;
1024
1025 void initialize(); // Initialized the instance variables
1026
1027 public:
1028 // Constructor
1029 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1030 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1031 ~JavaThread();
1032
1033 #ifdef ASSERT
1034 // verify this JavaThread hasn't be published in the Threads::list yet
1035 void verify_not_published();
1036 #endif
1037
1038 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1039 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1040 _jni_environment.functions = functionTable;
1041 }
1042 struct JNINativeInterface_* get_jni_functions() {
1043 return (struct JNINativeInterface_ *)_jni_environment.functions;
1044 }
1045
1046 // This function is called at thread creation to allow
1047 // platform specific thread variables to be initialized.
1048 void cache_global_variables();
1049
1050 // Executes Shutdown.shutdown()
1051 void invoke_shutdown_hooks();
1052
1053 // Cleanup on thread exit
1054 enum ExitType {
1055 normal_exit,
1056 jni_detach
1057 };
1058 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1059
1060 void cleanup_failed_attach_current_thread();
1061
1062 // Testers
1063 virtual bool is_Java_thread() const { return true; }
1064 virtual bool can_call_java() const { return true; }
1065
1066 // Thread chain operations
1067 JavaThread* next() const { return _next; }
1068 void set_next(JavaThread* p) { _next = p; }
1069
1070 // Thread oop. threadObj() can be NULL for initial JavaThread
1071 // (or for threads attached via JNI)
1072 oop threadObj() const { return _threadObj; }
1073 void set_threadObj(oop p) { _threadObj = p; }
1074
1075 ThreadPriority java_priority() const; // Read from threadObj()
1076
1077 // Prepare thread and add to priority queue. If a priority is
1078 // not specified, use the priority of the thread object. Threads_lock
1079 // must be held while this function is called.
1080 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1081 void prepare_ext();
1082
1083 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1084 address saved_exception_pc() { return _saved_exception_pc; }
1085
1086
1087 ThreadFunction entry_point() const { return _entry_point; }
1088
1089 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1090 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1091
1092 // Last frame anchor routines
1093
1094 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1095
1096 // last_Java_sp
1097 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1098 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1099
1100 // last_Java_pc
1101
1102 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1103
1104 // Safepoint support
1105 #if !(defined(PPC64) || defined(AARCH64))
1106 JavaThreadState thread_state() const { return _thread_state; }
1107 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1108 #else
1109 // Use membars when accessing volatile _thread_state. See
1110 // Threads::create_vm() for size checks.
1111 inline JavaThreadState thread_state() const;
1112 inline void set_thread_state(JavaThreadState s);
1113 #endif
1114 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1115 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1116 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1117
1118 // thread has called JavaThread::exit() or is terminated
1119 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1120 // thread is terminated (no longer on the threads list); we compare
1121 // against the two non-terminated values so that a freed JavaThread
1122 // will also be considered terminated.
1123 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1124 void set_terminated(TerminatedTypes t) { _terminated = t; }
1125 // special for Threads::remove() which is static:
1126 void set_terminated_value() { _terminated = _thread_terminated; }
1127 void block_if_vm_exited();
1128
1129 bool doing_unsafe_access() { return _doing_unsafe_access; }
1130 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1131
1132 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1133 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1134
1135 // Suspend/resume support for JavaThread
1136 private:
1137 inline void set_ext_suspended();
1138 inline void clear_ext_suspended();
1139
1140 public:
1141 void java_suspend();
1142 void java_resume();
1143 int java_suspend_self();
1144
1145 void check_and_wait_while_suspended() {
1146 assert(JavaThread::current() == this, "sanity check");
1147
1148 bool do_self_suspend;
1149 do {
1150 // were we externally suspended while we were waiting?
1151 do_self_suspend = handle_special_suspend_equivalent_condition();
1152 if (do_self_suspend) {
1153 // don't surprise the thread that suspended us by returning
1154 java_suspend_self();
1155 set_suspend_equivalent();
1156 }
1157 } while (do_self_suspend);
1158 }
1159 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1160 // Check for async exception in addition to safepoint and suspend request.
1161 static void check_special_condition_for_native_trans(JavaThread *thread);
1162
1163 // Same as check_special_condition_for_native_trans but finishes the
1164 // transition into thread_in_Java mode so that it can potentially
1165 // block.
1166 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1167
1168 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1169 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1170 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1171 // Warning: is_ext_suspend_completed() may temporarily drop the
1172 // SR_lock to allow the thread to reach a stable thread state if
1173 // it is currently in a transient thread state.
1174 return is_ext_suspend_completed(false /* !called_by_wait */,
1175 SuspendRetryDelay, bits);
1176 }
1177
1178 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1179 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1180 // passed as the count and delay parameters. Experiments with specific
1181 // calls to wait_for_ext_suspend_completion() can be done by passing
1182 // other values in the code. Experiments with all calls can be done
1183 // via the appropriate -XX options.
1184 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1185
1186 inline void set_external_suspend();
1187 inline void clear_external_suspend();
1188
1189 inline void set_deopt_suspend();
1190 inline void clear_deopt_suspend();
1191 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1192
1193 bool is_external_suspend() const {
1194 return (_suspend_flags & _external_suspend) != 0;
1195 }
1196 // Whenever a thread transitions from native to vm/java it must suspend
1197 // if external|deopt suspend is present.
1198 bool is_suspend_after_native() const {
1199 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1200 }
1201
1202 // external suspend request is completed
1203 bool is_ext_suspended() const {
1204 return (_suspend_flags & _ext_suspended) != 0;
1205 }
1206
1207 bool is_external_suspend_with_lock() const {
1208 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1209 return is_external_suspend();
1210 }
1211
1212 // Special method to handle a pending external suspend request
1213 // when a suspend equivalent condition lifts.
1214 bool handle_special_suspend_equivalent_condition() {
1215 assert(is_suspend_equivalent(),
1216 "should only be called in a suspend equivalence condition");
1217 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1218 bool ret = is_external_suspend();
1219 if (!ret) {
1220 // not about to self-suspend so clear suspend equivalence
1221 clear_suspend_equivalent();
1222 }
1223 // implied else:
1224 // We have a pending external suspend request so we leave the
1225 // suspend_equivalent flag set until java_suspend_self() sets
1226 // the ext_suspended flag and clears the suspend_equivalent
1227 // flag. This insures that wait_for_ext_suspend_completion()
1228 // will return consistent values.
1229 return ret;
1230 }
1231
1232 // utility methods to see if we are doing some kind of suspension
1233 bool is_being_ext_suspended() const {
1234 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1235 return is_ext_suspended() || is_external_suspend();
1236 }
1237
1238 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1239
1240 void set_suspend_equivalent() { _suspend_equivalent = true; }
1241 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1242
1243 // Thread.stop support
1244 void send_thread_stop(oop throwable);
1245 AsyncRequests clear_special_runtime_exit_condition() {
1246 AsyncRequests x = _special_runtime_exit_condition;
1247 _special_runtime_exit_condition = _no_async_condition;
1248 return x;
1249 }
1250
1251 // Are any async conditions present?
1252 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1253
1254 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1255
1256 // these next two are also used for self-suspension and async exception support
1257 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1258
1259 // Return true if JavaThread has an asynchronous condition or
1260 // if external suspension is requested.
1261 bool has_special_runtime_exit_condition() {
1262 // We call is_external_suspend() last since external suspend should
1263 // be less common. Because we don't use is_external_suspend_with_lock
1264 // it is possible that we won't see an asynchronous external suspend
1265 // request that has just gotten started, i.e., SR_lock grabbed but
1266 // _external_suspend field change either not made yet or not visible
1267 // yet. However, this is okay because the request is asynchronous and
1268 // we will see the new flag value the next time through. It's also
1269 // possible that the external suspend request is dropped after
1270 // we have checked is_external_suspend(), we will recheck its value
1271 // under SR_lock in java_suspend_self().
1272 return (_special_runtime_exit_condition != _no_async_condition) ||
1273 is_external_suspend() || is_deopt_suspend();
1274 }
1275
1276 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1277
1278 inline void set_pending_async_exception(oop e);
1279
1280 // Fast-locking support
1281 bool is_lock_owned(address adr) const;
1282
1283 // Accessors for vframe array top
1284 // The linked list of vframe arrays are sorted on sp. This means when we
1285 // unpack the head must contain the vframe array to unpack.
1286 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1287 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1288
1289 // Side structure for deferring update of java frame locals until deopt occurs
1290 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1291 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1292
1293 // These only really exist to make debugging deopt problems simpler
1294
1295 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1296 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1297
1298 // The special resourceMark used during deoptimization
1299
1300 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1301 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1302
1303 intptr_t* must_deopt_id() { return _must_deopt_id; }
1304 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1305 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1306
1307 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; }
1308 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; }
1309
1310 Method* callee_target() const { return _callee_target; }
1311 void set_callee_target (Method* x) { _callee_target = x; }
1312
1313 // Oop results of vm runtime calls
1314 oop vm_result() const { return _vm_result; }
1315 void set_vm_result (oop x) { _vm_result = x; }
1316
1317 Metadata* vm_result_2() const { return _vm_result_2; }
1318 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1319
1320 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1321 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1322
1323 #if INCLUDE_JVMCI
1324 int pending_deoptimization() const { return _pending_deoptimization; }
1325 oop pending_failed_speculation() const { return _pending_failed_speculation; }
1326 bool adjusting_comp_level() const { return _adjusting_comp_level; }
1327 void set_adjusting_comp_level(bool b) { _adjusting_comp_level = b; }
1328 bool has_pending_monitorenter() const { return _pending_monitorenter; }
1329 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
1330 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
1331 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; }
1332 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
1333 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
1334 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
1335 #endif // INCLUDE_JVMCI
1336
1337 // Exception handling for compiled methods
1338 oop exception_oop() const { return _exception_oop; }
1339 address exception_pc() const { return _exception_pc; }
1340 address exception_handler_pc() const { return _exception_handler_pc; }
1341 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1342
1343 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1344 void set_exception_pc(address a) { _exception_pc = a; }
1345 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1346 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1347
1348 void clear_exception_oop_and_pc() {
1349 set_exception_oop(NULL);
1350 set_exception_pc(NULL);
1351 }
1352
1353 // Stack overflow support
1354 //
1355 // (small addresses)
1356 //
1357 // -- <-- stack_end() ---
1358 // | |
1359 // | red pages |
1360 // | |
1361 // -- <-- stack_red_zone_base() |
1362 // | |
1363 // | guard
1364 // | yellow pages zone
1365 // | |
1366 // | |
1367 // -- <-- stack_yellow_zone_base() |
1368 // | |
1369 // | |
1370 // | reserved pages |
1371 // | |
1372 // -- <-- stack_reserved_zone_base() --- ---
1373 // /|\ shadow <-- stack_overflow_limit() (somewhere in here)
1374 // | zone
1375 // \|/ size
1376 // some untouched memory ---
1377 //
1378 //
1379 // --
1380 // |
1381 // | shadow zone
1382 // |
1383 // --
1384 // x frame n
1385 // --
1386 // x frame n-1
1387 // x
1388 // --
1389 // ...
1390 //
1391 // --
1392 // x frame 0
1393 // -- <-- stack_base()
1394 //
1395 // (large addresses)
1396 //
1397
1398 private:
1399 // These values are derived from flags StackRedPages, StackYellowPages,
1400 // StackReservedPages and StackShadowPages. The zone size is determined
1401 // ergonomically if page_size > 4K.
1402 static size_t _stack_red_zone_size;
1403 static size_t _stack_yellow_zone_size;
1404 static size_t _stack_reserved_zone_size;
1405 static size_t _stack_shadow_zone_size;
1406 public:
1407 inline size_t stack_available(address cur_sp);
1408
1409 static size_t stack_red_zone_size() {
1410 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized.");
1411 return _stack_red_zone_size;
1412 }
1413 static void set_stack_red_zone_size(size_t s) {
1414 assert(is_size_aligned(s, os::vm_page_size()),
1415 "We can not protect if the red zone size is not page aligned.");
1416 assert(_stack_red_zone_size == 0, "This should be called only once.");
1417 _stack_red_zone_size = s;
1418 }
1419 address stack_red_zone_base() {
1420 return (address)(stack_end() + stack_red_zone_size());
1421 }
1422 bool in_stack_red_zone(address a) {
1423 return a <= stack_red_zone_base() && a >= stack_end();
1424 }
1425
1426 static size_t stack_yellow_zone_size() {
1427 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized.");
1428 return _stack_yellow_zone_size;
1429 }
1430 static void set_stack_yellow_zone_size(size_t s) {
1431 assert(is_size_aligned(s, os::vm_page_size()),
1432 "We can not protect if the yellow zone size is not page aligned.");
1433 assert(_stack_yellow_zone_size == 0, "This should be called only once.");
1434 _stack_yellow_zone_size = s;
1435 }
1436
1437 static size_t stack_reserved_zone_size() {
1438 // _stack_reserved_zone_size may be 0. This indicates the feature is off.
1439 return _stack_reserved_zone_size;
1440 }
1441 static void set_stack_reserved_zone_size(size_t s) {
1442 assert(is_size_aligned(s, os::vm_page_size()),
1443 "We can not protect if the reserved zone size is not page aligned.");
1444 assert(_stack_reserved_zone_size == 0, "This should be called only once.");
1445 _stack_reserved_zone_size = s;
1446 }
1447 address stack_reserved_zone_base() {
1448 return (address)(stack_end() +
1449 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size()));
1450 }
1451 bool in_stack_reserved_zone(address a) {
1452 return (a <= stack_reserved_zone_base()) &&
1453 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size()));
1454 }
1455
1456 static size_t stack_yellow_reserved_zone_size() {
1457 return _stack_yellow_zone_size + _stack_reserved_zone_size;
1458 }
1459 bool in_stack_yellow_reserved_zone(address a) {
1460 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base());
1461 }
1462
1463 // Size of red + yellow + reserved zones.
1464 static size_t stack_guard_zone_size() {
1465 return stack_red_zone_size() + stack_yellow_reserved_zone_size();
1466 }
1467
1468 static size_t stack_shadow_zone_size() {
1469 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized.");
1470 return _stack_shadow_zone_size;
1471 }
1472 static void set_stack_shadow_zone_size(size_t s) {
1473 // The shadow area is not allocated or protected, so
1474 // it needs not be page aligned.
1475 // But the stack bang currently assumes that it is a
1476 // multiple of page size. This guarantees that the bang
1477 // loop touches all pages in the shadow zone.
1478 // This can be guaranteed differently, as well. E.g., if
1479 // the page size is a multiple of 4K, banging in 4K steps
1480 // suffices to touch all pages. (Some pages are banged
1481 // several times, though.)
1482 assert(is_size_aligned(s, os::vm_page_size()),
1483 "Stack bang assumes multiple of page size.");
1484 assert(_stack_shadow_zone_size == 0, "This should be called only once.");
1485 _stack_shadow_zone_size = s;
1486 }
1487
1488 void create_stack_guard_pages();
1489 void remove_stack_guard_pages();
1490
1491 void enable_stack_reserved_zone();
1492 void disable_stack_reserved_zone();
1493 void enable_stack_yellow_reserved_zone();
1494 void disable_stack_yellow_reserved_zone();
1495 void enable_stack_red_zone();
1496 void disable_stack_red_zone();
1497
1498 inline bool stack_guard_zone_unused();
1499 inline bool stack_yellow_reserved_zone_disabled();
1500 inline bool stack_reserved_zone_disabled();
1501 inline bool stack_guards_enabled();
1502
1503 address reserved_stack_activation() const { return _reserved_stack_activation; }
1504 void set_reserved_stack_activation(address addr) {
1505 assert(_reserved_stack_activation == stack_base()
1506 || _reserved_stack_activation == NULL
1507 || addr == stack_base(), "Must not be set twice");
1508 _reserved_stack_activation = addr;
1509 }
1510
1511 // Attempt to reguard the stack after a stack overflow may have occurred.
1512 // Returns true if (a) guard pages are not needed on this thread, (b) the
1513 // pages are already guarded, or (c) the pages were successfully reguarded.
1514 // Returns false if there is not enough stack space to reguard the pages, in
1515 // which case the caller should unwind a frame and try again. The argument
1516 // should be the caller's (approximate) sp.
1517 bool reguard_stack(address cur_sp);
1518 // Similar to above but see if current stackpoint is out of the guard area
1519 // and reguard if possible.
1520 bool reguard_stack(void);
1521
1522 address stack_overflow_limit() { return _stack_overflow_limit; }
1523 void set_stack_overflow_limit() {
1524 _stack_overflow_limit =
1525 stack_end() + MAX2(JavaThread::stack_guard_zone_size(), JavaThread::stack_shadow_zone_size());
1526 }
1527
1528 // Misc. accessors/mutators
1529 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1530 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1531 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1532
1533 #ifndef PRODUCT
1534 void record_jump(address target, address instr, const char* file, int line);
1535 #endif // PRODUCT
1536
1537 // For assembly stub generation
1538 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1539 #ifndef PRODUCT
1540 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1541 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1542 #endif // PRODUCT
1543 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1544 static ByteSize pending_jni_exception_check_fn_offset() {
1545 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn);
1546 }
1547 static ByteSize last_Java_sp_offset() {
1548 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1549 }
1550 static ByteSize last_Java_pc_offset() {
1551 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1552 }
1553 static ByteSize frame_anchor_offset() {
1554 return byte_offset_of(JavaThread, _anchor);
1555 }
1556 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1557 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1558 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1559 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1560 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1561 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1562 #if INCLUDE_JVMCI
1563 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
1564 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
1565 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); }
1566 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
1567 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
1568 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
1569 #endif // INCLUDE_JVMCI
1570 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1571 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1572 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1573 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1574 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1575 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1576 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); }
1577 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1578
1579 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1580 static ByteSize should_post_on_exceptions_flag_offset() {
1581 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1582 }
1583
1584 #if INCLUDE_ALL_GCS
1585 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1586 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1587 #endif // INCLUDE_ALL_GCS
1588
1589 // Returns the jni environment for this thread
1590 JNIEnv* jni_environment() { return &_jni_environment; }
1591
1592 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1593 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1594 // Only return NULL if thread is off the thread list; starting to
1595 // exit should not return NULL.
1596 if (thread_from_jni_env->is_terminated()) {
1597 thread_from_jni_env->block_if_vm_exited();
1598 return NULL;
1599 } else {
1600 return thread_from_jni_env;
1601 }
1602 }
1603
1604 // JNI critical regions. These can nest.
1605 bool in_critical() { return _jni_active_critical > 0; }
1606 bool in_last_critical() { return _jni_active_critical == 1; }
1607 void enter_critical() {
1608 assert(Thread::current() == this ||
1609 (Thread::current()->is_VM_thread() &&
1610 SafepointSynchronize::is_synchronizing()),
1611 "this must be current thread or synchronizing");
1612 _jni_active_critical++;
1613 }
1614 void exit_critical() {
1615 assert(Thread::current() == this, "this must be current thread");
1616 _jni_active_critical--;
1617 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1618 }
1619
1620 // Checked JNI: is the programmer required to check for exceptions, if so specify
1621 // which function name. Returning to a Java frame should implicitly clear the
1622 // pending check, this is done for Native->Java transitions (i.e. user JNI code).
1623 // VM->Java transistions are not cleared, it is expected that JNI code enclosed
1624 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal).
1625 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1626 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1627 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1628 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1629
1630 // For deadlock detection
1631 int depth_first_number() { return _depth_first_number; }
1632 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1633
1634 private:
1635 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1636
1637 public:
1638 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1639 void add_monitor_chunk(MonitorChunk* chunk);
1640 void remove_monitor_chunk(MonitorChunk* chunk);
1641 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1642 void inc_in_deopt_handler() { _in_deopt_handler++; }
1643 void dec_in_deopt_handler() {
1644 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1645 if (_in_deopt_handler > 0) { // robustness
1646 _in_deopt_handler--;
1647 }
1648 }
1649
1650 private:
1651 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1652
1653 public:
1654
1655 // Frame iteration; calls the function f for all frames on the stack
1656 void frames_do(void f(frame*, const RegisterMap*));
1657
1658 // Memory operations
1659 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1660
1661 // Sweeper operations
1662 virtual void nmethods_do(CodeBlobClosure* cf);
1663
1664 // RedefineClasses Support
1665 void metadata_do(void f(Metadata*));
1666
1667 // Misc. operations
1668 char* name() const { return (char*)get_thread_name(); }
1669 void print_on(outputStream* st) const;
1670 void print_value();
1671 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1672 void print_thread_state() const PRODUCT_RETURN;
1673 void print_on_error(outputStream* st, char* buf, int buflen) const;
1674 void print_name_on_error(outputStream* st, char* buf, int buflen) const;
1675 void verify();
1676 const char* get_thread_name() const;
1677 private:
1678 // factor out low-level mechanics for use in both normal and error cases
1679 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1680 public:
1681 const char* get_threadgroup_name() const;
1682 const char* get_parent_name() const;
1683
1684 // Accessing frames
1685 frame last_frame() {
1686 _anchor.make_walkable(this);
1687 return pd_last_frame();
1688 }
1689 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1690
1691 // Returns method at 'depth' java or native frames down the stack
1692 // Used for security checks
1693 Klass* security_get_caller_class(int depth);
1694
1695 // Print stack trace in external format
1696 void print_stack_on(outputStream* st);
1697 void print_stack() { print_stack_on(tty); }
1698
1699 // Print stack traces in various internal formats
1700 void trace_stack() PRODUCT_RETURN;
1701 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1702 void trace_frames() PRODUCT_RETURN;
1703 void trace_oops() PRODUCT_RETURN;
1704
1705 // Print an annotated view of the stack frames
1706 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1707 void validate_frame_layout() {
1708 print_frame_layout(0, true);
1709 }
1710
1711 // Returns the number of stack frames on the stack
1712 int depth() const;
1713
1714 // Function for testing deoptimization
1715 void deoptimize();
1716 void make_zombies();
1717
1718 void deoptimized_wrt_marked_nmethods();
1719
1720 // Profiling operation (see fprofile.cpp)
1721 public:
1722 bool profile_last_Java_frame(frame* fr);
1723
1724 private:
1725 ThreadProfiler* _thread_profiler;
1726 private:
1727 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1728 friend class FlatProfilerTask; // uses get_thread_profiler.
1729 friend class ThreadProfilerMark; // uses get_thread_profiler.
1730 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1731 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1732 ThreadProfiler* result = _thread_profiler;
1733 _thread_profiler = tp;
1734 return result;
1735 }
1736
1737 public:
1738 // Returns the running thread as a JavaThread
1739 static inline JavaThread* current();
1740
1741 // Returns the active Java thread. Do not use this if you know you are calling
1742 // from a JavaThread, as it's slower than JavaThread::current. If called from
1743 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1744 // operation. You may not want that either.
1745 static JavaThread* active();
1746
1747 inline CompilerThread* as_CompilerThread();
1748
1749 public:
1750 virtual void run();
1751 void thread_main_inner();
1752
1753 private:
1754 // PRIVILEGED STACK
1755 PrivilegedElement* _privileged_stack_top;
1756 GrowableArray<oop>* _array_for_gc;
1757 public:
1758
1759 // Returns the privileged_stack information.
1760 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1761 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1762 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1763
1764 public:
1765 // Thread local information maintained by JVMTI.
1766 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1767 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1768 // getter is used to get this JavaThread's JvmtiThreadState if it has
1769 // one which means NULL can be returned. JvmtiThreadState::state_for()
1770 // is used to get the specified JavaThread's JvmtiThreadState if it has
1771 // one or it allocates a new JvmtiThreadState for the JavaThread and
1772 // returns it. JvmtiThreadState::state_for() will return NULL only if
1773 // the specified JavaThread is exiting.
1774 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1775 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1776 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1777 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1778
1779 // JVMTI PopFrame support
1780 // Setting and clearing popframe_condition
1781 // All of these enumerated values are bits. popframe_pending
1782 // indicates that a PopFrame() has been requested and not yet been
1783 // completed. popframe_processing indicates that that PopFrame() is in
1784 // the process of being completed. popframe_force_deopt_reexecution_bit
1785 // indicates that special handling is required when returning to a
1786 // deoptimized caller.
1787 enum PopCondition {
1788 popframe_inactive = 0x00,
1789 popframe_pending_bit = 0x01,
1790 popframe_processing_bit = 0x02,
1791 popframe_force_deopt_reexecution_bit = 0x04
1792 };
1793 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1794 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1795 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1796 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1797 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1798 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1799 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1800 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1801 #ifdef CC_INTERP
1802 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1803 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1804 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1805 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1806 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1807 #endif
1808
1809 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1810 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1811 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1812
1813 private:
1814 // Saved incoming arguments to popped frame.
1815 // Used only when popped interpreted frame returns to deoptimized frame.
1816 void* _popframe_preserved_args;
1817 int _popframe_preserved_args_size;
1818
1819 public:
1820 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1821 void* popframe_preserved_args();
1822 ByteSize popframe_preserved_args_size();
1823 WordSize popframe_preserved_args_size_in_words();
1824 void popframe_free_preserved_args();
1825
1826
1827 private:
1828 JvmtiThreadState *_jvmti_thread_state;
1829 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1830
1831 // Used by the interpreter in fullspeed mode for frame pop, method
1832 // entry, method exit and single stepping support. This field is
1833 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1834 // It can be set to zero asynchronously (i.e., without a VM operation
1835 // or a lock) so we have to be very careful.
1836 int _interp_only_mode;
1837
1838 public:
1839 // used by the interpreter for fullspeed debugging support (see above)
1840 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1841 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1842 int get_interp_only_mode() { return _interp_only_mode; }
1843 void increment_interp_only_mode() { ++_interp_only_mode; }
1844 void decrement_interp_only_mode() { --_interp_only_mode; }
1845
1846 // support for cached flag that indicates whether exceptions need to be posted for this thread
1847 // if this is false, we can avoid deoptimizing when events are thrown
1848 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1849 private:
1850 int _should_post_on_exceptions_flag;
1851
1852 public:
1853 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1854 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1855
1856 private:
1857 ThreadStatistics *_thread_stat;
1858
1859 public:
1860 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1861
1862 // Return a blocker object for which this thread is blocked parking.
1863 oop current_park_blocker();
1864
1865 private:
1866 static size_t _stack_size_at_create;
1867
1868 public:
1869 static inline size_t stack_size_at_create(void) {
1870 return _stack_size_at_create;
1871 }
1872 static inline void set_stack_size_at_create(size_t value) {
1873 _stack_size_at_create = value;
1874 }
1875
1876 #if INCLUDE_ALL_GCS
1877 // SATB marking queue support
1878 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; }
1879 static SATBMarkQueueSet& satb_mark_queue_set() {
1880 return _satb_mark_queue_set;
1881 }
1882
1883 // Dirty card queue support
1884 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1885 static DirtyCardQueueSet& dirty_card_queue_set() {
1886 return _dirty_card_queue_set;
1887 }
1888 #endif // INCLUDE_ALL_GCS
1889
1890 // This method initializes the SATB and dirty card queues before a
1891 // JavaThread is added to the Java thread list. Right now, we don't
1892 // have to do anything to the dirty card queue (it should have been
1893 // activated when the thread was created), but we have to activate
1894 // the SATB queue if the thread is created while a marking cycle is
1895 // in progress. The activation / de-activation of the SATB queues at
1896 // the beginning / end of a marking cycle is done during safepoints
1897 // so we have to make sure this method is called outside one to be
1898 // able to safely read the active field of the SATB queue set. Right
1899 // now, it is called just before the thread is added to the Java
1900 // thread list in the Threads::add() method. That method is holding
1901 // the Threads_lock which ensures we are outside a safepoint. We
1902 // cannot do the obvious and set the active field of the SATB queue
1903 // when the thread is created given that, in some cases, safepoints
1904 // might happen between the JavaThread constructor being called and the
1905 // thread being added to the Java thread list (an example of this is
1906 // when the structure for the DestroyJavaVM thread is created).
1907 #if INCLUDE_ALL_GCS
1908 void initialize_queues();
1909 #else // INCLUDE_ALL_GCS
1910 void initialize_queues() { }
1911 #endif // INCLUDE_ALL_GCS
1912
1913 // Machine dependent stuff
1914 #include OS_CPU_HEADER(thread)
1915
1916 public:
1917 void set_blocked_on_compilation(bool value) {
1918 _blocked_on_compilation = value;
1919 }
1920
1921 bool blocked_on_compilation() {
1922 return _blocked_on_compilation;
1923 }
1924 protected:
1925 bool _blocked_on_compilation;
1926
1927
1928 // JSR166 per-thread parker
1929 private:
1930 Parker* _parker;
1931 public:
1932 Parker* parker() { return _parker; }
1933
1934 // Biased locking support
1935 private:
1936 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1937 public:
1938 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1939 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1940
1941 // clearing/querying jni attach status
1942 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1943 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1944 inline void set_done_attaching_via_jni();
1945 };
1946
1947 // Inline implementation of JavaThread::current
1948 inline JavaThread* JavaThread::current() {
1949 Thread* thread = Thread::current();
1950 assert(thread->is_Java_thread(), "just checking");
1951 return (JavaThread*)thread;
1952 }
1953
1954 inline CompilerThread* JavaThread::as_CompilerThread() {
1955 assert(is_Compiler_thread(), "just checking");
1956 return (CompilerThread*)this;
1957 }
1958
1959 // Dedicated thread to sweep the code cache
1960 class CodeCacheSweeperThread : public JavaThread {
1961 CompiledMethod* _scanned_compiled_method; // nmethod being scanned by the sweeper
1962 public:
1963 CodeCacheSweeperThread();
1964 // Track the nmethod currently being scanned by the sweeper
1965 void set_scanned_compiled_method(CompiledMethod* cm) {
1966 assert(_scanned_compiled_method == NULL || cm == NULL, "should reset to NULL before writing a new value");
1967 _scanned_compiled_method = cm;
1968 }
1969
1970 // Hide sweeper thread from external view.
1971 bool is_hidden_from_external_view() const { return true; }
1972
1973 bool is_Code_cache_sweeper_thread() const { return true; }
1974
1975 // Prevent GC from unloading _scanned_compiled_method
1976 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1977 void nmethods_do(CodeBlobClosure* cf);
1978 };
1979
1980 // A thread used for Compilation.
1981 class CompilerThread : public JavaThread {
1982 friend class VMStructs;
1983 private:
1984 CompilerCounters* _counters;
1985
1986 ciEnv* _env;
1987 CompileLog* _log;
1988 CompileTask* _task;
1989 CompileQueue* _queue;
1990 BufferBlob* _buffer_blob;
1991
1992 AbstractCompiler* _compiler;
1993
1994 public:
1995
1996 static CompilerThread* current();
1997
1998 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1999
2000 bool is_Compiler_thread() const { return true; }
2001
2002 virtual bool can_call_java() const;
2003
2004 // Hide native compiler threads from external view.
2005 bool is_hidden_from_external_view() const { return !can_call_java(); }
2006
2007 void set_compiler(AbstractCompiler* c) { _compiler = c; }
2008 AbstractCompiler* compiler() const { return _compiler; }
2009
2010 CompileQueue* queue() const { return _queue; }
2011 CompilerCounters* counters() const { return _counters; }
2012
2013 // Get/set the thread's compilation environment.
2014 ciEnv* env() { return _env; }
2015 void set_env(ciEnv* env) { _env = env; }
2016
2017 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
2018 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
2019
2020 // Get/set the thread's logging information
2021 CompileLog* log() { return _log; }
2022 void init_log(CompileLog* log) {
2023 // Set once, for good.
2024 assert(_log == NULL, "set only once");
2025 _log = log;
2026 }
2027
2028 #ifndef PRODUCT
2029 private:
2030 IdealGraphPrinter *_ideal_graph_printer;
2031 public:
2032 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
2033 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
2034 #endif
2035
2036 // Get/set the thread's current task
2037 CompileTask* task() { return _task; }
2038 void set_task(CompileTask* task) { _task = task; }
2039 };
2040
2041 inline CompilerThread* CompilerThread::current() {
2042 return JavaThread::current()->as_CompilerThread();
2043 }
2044
2045 // The active thread queue. It also keeps track of the current used
2046 // thread priorities.
2047 class Threads: AllStatic {
2048 friend class VMStructs;
2049 private:
2050 static JavaThread* _thread_list;
2051 static int _number_of_threads;
2052 static int _number_of_non_daemon_threads;
2053 static int _return_code;
2054 static int _thread_claim_parity;
2055 #ifdef ASSERT
2056 static bool _vm_complete;
2057 #endif
2058
2059 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
2060 static void initialize_jsr292_core_classes(TRAPS);
2061 public:
2062 // Thread management
2063 // force_daemon is a concession to JNI, where we may need to add a
2064 // thread to the thread list before allocating its thread object
2065 static void add(JavaThread* p, bool force_daemon = false);
2066 static void remove(JavaThread* p);
2067 static bool includes(JavaThread* p);
2068 static JavaThread* first() { return _thread_list; }
2069 static void threads_do(ThreadClosure* tc);
2070
2071 // Initializes the vm and creates the vm thread
2072 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
2073 static void convert_vm_init_libraries_to_agents();
2074 static void create_vm_init_libraries();
2075 static void create_vm_init_agents();
2076 static void shutdown_vm_agents();
2077 static bool destroy_vm();
2078 // Supported VM versions via JNI
2079 // Includes JNI_VERSION_1_1
2080 static jboolean is_supported_jni_version_including_1_1(jint version);
2081 // Does not include JNI_VERSION_1_1
2082 static jboolean is_supported_jni_version(jint version);
2083
2084 // The "thread claim parity" provides a way for threads to be claimed
2085 // by parallel worker tasks.
2086 //
2087 // Each thread contains a a "parity" field. A task will claim the
2088 // thread only if its parity field is the same as the global parity,
2089 // which is updated by calling change_thread_claim_parity().
2090 //
2091 // For this to work change_thread_claim_parity() needs to be called
2092 // exactly once in sequential code before starting parallel tasks
2093 // that should claim threads.
2094 //
2095 // New threads get their parity set to 0 and change_thread_claim_parity()
2096 // never set the global parity to 0.
2097 static int thread_claim_parity() { return _thread_claim_parity; }
2098 static void change_thread_claim_parity();
2099 static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
2100
2101 // Apply "f->do_oop" to all root oops in all threads.
2102 // This version may only be called by sequential code.
2103 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
2104 // This version may be called by sequential or parallel code.
2105 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf);
2106
2107 // Apply "f->do_oop" to roots in all threads that
2108 // are part of compiled frames
2109 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
2110
2111 static void convert_hcode_pointers();
2112 static void restore_hcode_pointers();
2113
2114 // Sweeper
2115 static void nmethods_do(CodeBlobClosure* cf);
2116
2117 // RedefineClasses support
2118 static void metadata_do(void f(Metadata*));
2119 static void metadata_handles_do(void f(Metadata*));
2120
2121 #ifdef ASSERT
2122 static bool is_vm_complete() { return _vm_complete; }
2123 #endif
2124
2125 // Verification
2126 static void verify();
2127 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
2128 static void print(bool print_stacks, bool internal_format) {
2129 // this function is only used by debug.cpp
2130 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
2131 }
2132 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2133 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf,
2134 int buflen, bool* found_current);
2135 static void print_threads_compiling(outputStream* st, char* buf, int buflen);
2136
2137 // Get Java threads that are waiting to enter a monitor. If doLock
2138 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2139 // VM needs to be at a safepoint.
2140 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2141 address monitor, bool doLock);
2142
2143 // Get owning Java thread from the monitor's owner field. If doLock
2144 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2145 // VM needs to be at a safepoint.
2146 static JavaThread *owning_thread_from_monitor_owner(address owner,
2147 bool doLock);
2148
2149 // Number of threads on the active threads list
2150 static int number_of_threads() { return _number_of_threads; }
2151 // Number of non-daemon threads on the active threads list
2152 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2153
2154 // Deoptimizes all frames tied to marked nmethods
2155 static void deoptimized_wrt_marked_nmethods();
2156
2157 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2158
2159 };
2160
2161
2162 // Thread iterator
2163 class ThreadClosure: public StackObj {
2164 public:
2165 virtual void do_thread(Thread* thread) = 0;
2166 };
2167
2168 class SignalHandlerMark: public StackObj {
2169 private:
2170 Thread* _thread;
2171 public:
2172 SignalHandlerMark(Thread* t) {
2173 _thread = t;
2174 if (_thread) _thread->enter_signal_handler();
2175 }
2176 ~SignalHandlerMark() {
2177 if (_thread) _thread->leave_signal_handler();
2178 _thread = NULL;
2179 }
2180 };
2181
2182
2183 #endif // SHARE_VM_RUNTIME_THREAD_HPP