1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 #define SHARE_VM_RUNTIME_THREAD_HPP
27
28 #include "gc/shared/threadLocalAllocBuffer.hpp"
29 #include "memory/allocation.hpp"
30 #include "oops/oop.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvmtiExport.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/javaFrameAnchor.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/mutexLocker.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/osThread.hpp"
39 #include "runtime/park.hpp"
40 #include "runtime/safepoint.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "runtime/thread_ext.hpp"
43 #include "runtime/unhandledOops.hpp"
44 #include "trace/traceBackend.hpp"
45 #include "trace/traceMacros.hpp"
46 #include "utilities/exceptions.hpp"
47 #include "utilities/macros.hpp"
48 #include "utilities/top.hpp"
49 #if INCLUDE_ALL_GCS
50 #include "gc/g1/dirtyCardQueue.hpp"
51 #include "gc/g1/satbQueue.hpp"
52 #endif // INCLUDE_ALL_GCS
53 #ifdef TARGET_ARCH_zero
54 # include "stack_zero.hpp"
55 #endif
56
57 class ThreadSafepointState;
58 class ThreadProfiler;
59
60 class JvmtiThreadState;
61 class JvmtiGetLoadedClassesClosure;
62 class ThreadStatistics;
63 class ConcurrentLocksDump;
64 class ParkEvent;
65 class Parker;
66
67 class ciEnv;
68 class CompileThread;
69 class CompileLog;
70 class CompileTask;
71 class CompileQueue;
72 class CompilerCounters;
73 class vframeArray;
74
75 class DeoptResourceMark;
76 class jvmtiDeferredLocalVariableSet;
77
78 class GCTaskQueue;
79 class ThreadClosure;
80 class IdealGraphPrinter;
81
82 class Metadata;
83 template <class T, MEMFLAGS F> class ChunkedList;
84 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
85
86 DEBUG_ONLY(class ResourceMark;)
87
88 class WorkerThread;
89
90 // Class hierarchy
91 // - Thread
92 // - NamedThread
93 // - VMThread
94 // - ConcurrentGCThread
95 // - WorkerThread
96 // - GangWorker
97 // - GCTaskThread
98 // - JavaThread
99 // - WatcherThread
100
101 class Thread: public ThreadShadow {
102 friend class VMStructs;
103 private:
104 // Current thread is maintained as a thread-local variable
105 static THREAD_LOCAL_DECL Thread* _thr_current;
106
107 // Exception handling
108 // (Note: _pending_exception and friends are in ThreadShadow)
109 //oop _pending_exception; // pending exception for current thread
110 // const char* _exception_file; // file information for exception (debugging only)
111 // int _exception_line; // line information for exception (debugging only)
112 protected:
113 // Support for forcing alignment of thread objects for biased locking
114 void* _real_malloc_address;
115 public:
116 void* operator new(size_t size) throw() { return allocate(size, true); }
117 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
118 return allocate(size, false); }
119 void operator delete(void* p);
120
121 protected:
122 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
123 private:
124
125 // ***************************************************************
126 // Suspend and resume support
127 // ***************************************************************
128 //
129 // VM suspend/resume no longer exists - it was once used for various
130 // things including safepoints but was deprecated and finally removed
131 // in Java 7. Because VM suspension was considered "internal" Java-level
132 // suspension was considered "external", and this legacy naming scheme
133 // remains.
134 //
135 // External suspend/resume requests come from JVM_SuspendThread,
136 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
137 // ResumeThread. External
138 // suspend requests cause _external_suspend to be set and external
139 // resume requests cause _external_suspend to be cleared.
140 // External suspend requests do not nest on top of other external
141 // suspend requests. The higher level APIs reject suspend requests
142 // for already suspended threads.
143 //
144 // The external_suspend
145 // flag is checked by has_special_runtime_exit_condition() and java thread
146 // will self-suspend when handle_special_runtime_exit_condition() is
147 // called. Most uses of the _thread_blocked state in JavaThreads are
148 // considered the same as being externally suspended; if the blocking
149 // condition lifts, the JavaThread will self-suspend. Other places
150 // where VM checks for external_suspend include:
151 // + mutex granting (do not enter monitors when thread is suspended)
152 // + state transitions from _thread_in_native
153 //
154 // In general, java_suspend() does not wait for an external suspend
155 // request to complete. When it returns, the only guarantee is that
156 // the _external_suspend field is true.
157 //
158 // wait_for_ext_suspend_completion() is used to wait for an external
159 // suspend request to complete. External suspend requests are usually
160 // followed by some other interface call that requires the thread to
161 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
162 // the interface that requires quiescence, we give the JavaThread a
163 // chance to self-suspend before we need it to be quiescent. This
164 // improves overall suspend/query performance.
165 //
166 // _suspend_flags controls the behavior of java_ suspend/resume.
167 // It must be set under the protection of SR_lock. Read from the flag is
168 // OK without SR_lock as long as the value is only used as a hint.
169 // (e.g., check _external_suspend first without lock and then recheck
170 // inside SR_lock and finish the suspension)
171 //
172 // _suspend_flags is also overloaded for other "special conditions" so
173 // that a single check indicates whether any special action is needed
174 // eg. for async exceptions.
175 // -------------------------------------------------------------------
176 // Notes:
177 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
178 // but we still update its value to keep other part of the system (mainly
179 // JVMTI) happy. ThreadState is legacy code (see notes in
180 // osThread.hpp).
181 //
182 // 2. It would be more natural if set_external_suspend() is private and
183 // part of java_suspend(), but that probably would affect the suspend/query
184 // performance. Need more investigation on this.
185
186 // suspend/resume lock: used for self-suspend
187 Monitor* _SR_lock;
188
189 protected:
190 enum SuspendFlags {
191 // NOTE: avoid using the sign-bit as cc generates different test code
192 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
193
194 _external_suspend = 0x20000000U, // thread is asked to self suspend
195 _ext_suspended = 0x40000000U, // thread has self-suspended
196 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
197
198 _has_async_exception = 0x00000001U, // there is a pending async exception
199 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
200 };
201
202 // various suspension related flags - atomically updated
203 // overloaded for async exception checking in check_special_condition_for_native_trans.
204 volatile uint32_t _suspend_flags;
205
206 private:
207 int _num_nested_signal;
208
209 DEBUG_ONLY(bool _suspendible_thread;)
210
211 public:
212 void enter_signal_handler() { _num_nested_signal++; }
213 void leave_signal_handler() { _num_nested_signal--; }
214 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
215
216 #ifdef ASSERT
217 void set_suspendible_thread() {
218 _suspendible_thread = true;
219 }
220
221 void clear_suspendible_thread() {
222 _suspendible_thread = false;
223 }
224
225 bool is_suspendible_thread() { return _suspendible_thread; }
226 #endif
227
228 private:
229 // Active_handles points to a block of handles
230 JNIHandleBlock* _active_handles;
231
232 // One-element thread local free list
233 JNIHandleBlock* _free_handle_block;
234
235 // Point to the last handle mark
236 HandleMark* _last_handle_mark;
237
238 // The parity of the last strong_roots iteration in which this thread was
239 // claimed as a task.
240 jint _oops_do_parity;
241
242 public:
243 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
244 HandleMark* last_handle_mark() const { return _last_handle_mark; }
245 private:
246
247 // debug support for checking if code does allow safepoints or not
248 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
249 // mutex, or blocking on an object synchronizer (Java locking).
250 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
251 // If !allow_allocation(), then an assertion failure will happen during allocation
252 // (Hence, !allow_safepoint() => !allow_allocation()).
253 //
254 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
255 //
256 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
257 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
258
259 // Used by SkipGCALot class.
260 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
261
262 friend class No_Alloc_Verifier;
263 friend class No_Safepoint_Verifier;
264 friend class Pause_No_Safepoint_Verifier;
265 friend class GC_locker;
266
267 ThreadLocalAllocBuffer _tlab; // Thread-local eden
268 jlong _allocated_bytes; // Cumulative number of bytes allocated on
269 // the Java heap
270
271 TRACE_DATA _trace_data; // Thread-local data for tracing
272
273 ThreadExt _ext;
274
275 int _vm_operation_started_count; // VM_Operation support
276 int _vm_operation_completed_count; // VM_Operation support
277
278 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
279 // is waiting to lock
280 bool _current_pending_monitor_is_from_java; // locking is from Java code
281
282 // ObjectMonitor on which this thread called Object.wait()
283 ObjectMonitor* _current_waiting_monitor;
284
285 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
286 public:
287 ObjectMonitor* omFreeList;
288 int omFreeCount; // length of omFreeList
289 int omFreeProvision; // reload chunk size
290 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
291 int omInUseCount; // length of omInUseList
292
293 #ifdef ASSERT
294 private:
295 bool _visited_for_critical_count;
296
297 public:
298 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
299 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
300 #endif
301
302 public:
303 enum {
304 is_definitely_current_thread = true
305 };
306
307 // Constructor
308 Thread();
309 virtual ~Thread();
310
311 // Manage Thread::current()
312 void initialize_thread_current();
313 void clear_thread_current(); // needed for detaching JNI threads
314
315 // thread entry point
316 virtual void run();
317
318 // Testers
319 virtual bool is_VM_thread() const { return false; }
320 virtual bool is_Java_thread() const { return false; }
321 virtual bool is_Compiler_thread() const { return false; }
322 virtual bool is_Code_cache_sweeper_thread() const { return false; }
323 virtual bool is_hidden_from_external_view() const { return false; }
324 virtual bool is_jvmti_agent_thread() const { return false; }
325 // True iff the thread can perform GC operations at a safepoint.
326 // Generally will be true only of VM thread and parallel GC WorkGang
327 // threads.
328 virtual bool is_GC_task_thread() const { return false; }
329 virtual bool is_Watcher_thread() const { return false; }
330 virtual bool is_ConcurrentGC_thread() const { return false; }
331 virtual bool is_Named_thread() const { return false; }
332 virtual bool is_Worker_thread() const { return false; }
333
334 // Can this thread make Java upcalls
335 virtual bool can_call_java() const { return false; }
336
337 // Casts
338 virtual WorkerThread* as_Worker_thread() const { return NULL; }
339
340 virtual char* name() const { return (char*)"Unknown thread"; }
341
342 // Returns the current thread
343 static inline Thread* current();
344 // ... without having to include thread.inline.hpp.
345 static Thread* current_noinline();
346
347 // Common thread operations
348 static void set_priority(Thread* thread, ThreadPriority priority);
349 static ThreadPriority get_priority(const Thread* const thread);
350 static void start(Thread* thread);
351 static void interrupt(Thread* thr);
352 static bool is_interrupted(Thread* thr, bool clear_interrupted);
353
354 void set_native_thread_name(const char *name) {
355 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
356 os::set_native_thread_name(name);
357 }
358
359 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
360 Monitor* SR_lock() const { return _SR_lock; }
361
362 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
363
364 inline void set_suspend_flag(SuspendFlags f);
365 inline void clear_suspend_flag(SuspendFlags f);
366
367 inline void set_has_async_exception();
368 inline void clear_has_async_exception();
369
370 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
371
372 inline void set_critical_native_unlock();
373 inline void clear_critical_native_unlock();
374
375 // Support for Unhandled Oop detection
376 // Add the field for both, fastdebug and debug, builds to keep
377 // Thread's fields layout the same.
378 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build.
379 #ifdef CHECK_UNHANDLED_OOPS
380 private:
381 UnhandledOops* _unhandled_oops;
382 #elif defined(ASSERT)
383 private:
384 void* _unhandled_oops;
385 #endif
386 #ifdef CHECK_UNHANDLED_OOPS
387 public:
388 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
389 // Mark oop safe for gc. It may be stack allocated but won't move.
390 void allow_unhandled_oop(oop *op) {
391 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
392 }
393 // Clear oops at safepoint so crashes point to unhandled oop violator
394 void clear_unhandled_oops() {
395 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
396 }
397 #endif // CHECK_UNHANDLED_OOPS
398
399 public:
400 #ifndef PRODUCT
401 bool skip_gcalot() { return _skip_gcalot; }
402 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
403 #endif
404
405 // Installs a pending exception to be inserted later
406 static void send_async_exception(oop thread_oop, oop java_throwable);
407
408 // Resource area
409 ResourceArea* resource_area() const { return _resource_area; }
410 void set_resource_area(ResourceArea* area) { _resource_area = area; }
411
412 OSThread* osthread() const { return _osthread; }
413 void set_osthread(OSThread* thread) { _osthread = thread; }
414
415 // JNI handle support
416 JNIHandleBlock* active_handles() const { return _active_handles; }
417 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
418 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
419 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
420
421 // Internal handle support
422 HandleArea* handle_area() const { return _handle_area; }
423 void set_handle_area(HandleArea* area) { _handle_area = area; }
424
425 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
426 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
427
428 // Thread-Local Allocation Buffer (TLAB) support
429 ThreadLocalAllocBuffer& tlab() { return _tlab; }
430 void initialize_tlab() {
431 if (UseTLAB) {
432 tlab().initialize();
433 }
434 }
435
436 jlong allocated_bytes() { return _allocated_bytes; }
437 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
438 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
439 inline jlong cooked_allocated_bytes();
440
441 TRACE_DATA* trace_data() { return &_trace_data; }
442
443 const ThreadExt& ext() const { return _ext; }
444 ThreadExt& ext() { return _ext; }
445
446 // VM operation support
447 int vm_operation_ticket() { return ++_vm_operation_started_count; }
448 int vm_operation_completed_count() { return _vm_operation_completed_count; }
449 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
450
451 // For tracking the heavyweight monitor the thread is pending on.
452 ObjectMonitor* current_pending_monitor() {
453 return _current_pending_monitor;
454 }
455 void set_current_pending_monitor(ObjectMonitor* monitor) {
456 _current_pending_monitor = monitor;
457 }
458 void set_current_pending_monitor_is_from_java(bool from_java) {
459 _current_pending_monitor_is_from_java = from_java;
460 }
461 bool current_pending_monitor_is_from_java() {
462 return _current_pending_monitor_is_from_java;
463 }
464
465 // For tracking the ObjectMonitor on which this thread called Object.wait()
466 ObjectMonitor* current_waiting_monitor() {
467 return _current_waiting_monitor;
468 }
469 void set_current_waiting_monitor(ObjectMonitor* monitor) {
470 _current_waiting_monitor = monitor;
471 }
472
473 // GC support
474 // Apply "f->do_oop" to all root oops in "this".
475 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
476 // Used by JavaThread::oops_do.
477 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
478 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
479
480 // Handles the parallel case for the method below.
481 private:
482 bool claim_oops_do_par_case(int collection_parity);
483 public:
484 // Requires that "collection_parity" is that of the current roots
485 // iteration. If "is_par" is false, sets the parity of "this" to
486 // "collection_parity", and returns "true". If "is_par" is true,
487 // uses an atomic instruction to set the current threads parity to
488 // "collection_parity", if it is not already. Returns "true" iff the
489 // calling thread does the update, this indicates that the calling thread
490 // has claimed the thread's stack as a root groop in the current
491 // collection.
492 bool claim_oops_do(bool is_par, int collection_parity) {
493 if (!is_par) {
494 _oops_do_parity = collection_parity;
495 return true;
496 } else {
497 return claim_oops_do_par_case(collection_parity);
498 }
499 }
500
501 // Sweeper support
502 void nmethods_do(CodeBlobClosure* cf);
503
504 // jvmtiRedefineClasses support
505 void metadata_handles_do(void f(Metadata*));
506
507 // Used by fast lock support
508 virtual bool is_lock_owned(address adr) const;
509
510 // Check if address is in the stack of the thread (not just for locks).
511 // Warning: the method can only be used on the running thread
512 bool is_in_stack(address adr) const;
513 // Check if address is in the usable part of the stack (excludes protected
514 // guard pages)
515 bool is_in_usable_stack(address adr) const;
516
517 // Sets this thread as starting thread. Returns failure if thread
518 // creation fails due to lack of memory, too many threads etc.
519 bool set_as_starting_thread();
520
521 protected:
522 // OS data associated with the thread
523 OSThread* _osthread; // Platform-specific thread information
524
525 // Thread local resource area for temporary allocation within the VM
526 ResourceArea* _resource_area;
527
528 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
529
530 // Thread local handle area for allocation of handles within the VM
531 HandleArea* _handle_area;
532 GrowableArray<Metadata*>* _metadata_handles;
533
534 // Support for stack overflow handling, get_thread, etc.
535 address _stack_base;
536 size_t _stack_size;
537 uintptr_t _self_raw_id; // used by get_thread (mutable)
538 int _lgrp_id;
539
540 public:
541 // Stack overflow support
542 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
543
544 void set_stack_base(address base) { _stack_base = base; }
545 size_t stack_size() const { return _stack_size; }
546 void set_stack_size(size_t size) { _stack_size = size; }
547 void record_stack_base_and_size();
548
549 bool on_local_stack(address adr) const {
550 // QQQ this has knowledge of direction, ought to be a stack method
551 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
552 }
553
554 uintptr_t self_raw_id() { return _self_raw_id; }
555 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
556
557 int lgrp_id() const { return _lgrp_id; }
558 void set_lgrp_id(int value) { _lgrp_id = value; }
559
560 // Printing
561 virtual void print_on(outputStream* st) const;
562 void print() const { print_on(tty); }
563 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
564
565 // Debug-only code
566 #ifdef ASSERT
567 private:
568 // Deadlock detection support for Mutex locks. List of locks own by thread.
569 Monitor* _owned_locks;
570 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
571 // thus the friendship
572 friend class Mutex;
573 friend class Monitor;
574
575 public:
576 void print_owned_locks_on(outputStream* st) const;
577 void print_owned_locks() const { print_owned_locks_on(tty); }
578 Monitor* owned_locks() const { return _owned_locks; }
579 bool owns_locks() const { return owned_locks() != NULL; }
580 bool owns_locks_but_compiled_lock() const;
581 int oops_do_parity() const { return _oops_do_parity; }
582
583 // Deadlock detection
584 bool allow_allocation() { return _allow_allocation_count == 0; }
585 ResourceMark* current_resource_mark() { return _current_resource_mark; }
586 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
587 #endif
588
589 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
590
591 private:
592 volatile int _jvmti_env_iteration_count;
593
594 public:
595 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
596 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
597 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
598
599 // Code generation
600 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
601 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
602 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
603
604 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
605 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
606
607 #define TLAB_FIELD_OFFSET(name) \
608 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
609
610 TLAB_FIELD_OFFSET(start)
611 TLAB_FIELD_OFFSET(end)
612 TLAB_FIELD_OFFSET(top)
613 TLAB_FIELD_OFFSET(pf_top)
614 TLAB_FIELD_OFFSET(size) // desired_size
615 TLAB_FIELD_OFFSET(refill_waste_limit)
616 TLAB_FIELD_OFFSET(number_of_refills)
617 TLAB_FIELD_OFFSET(fast_refill_waste)
618 TLAB_FIELD_OFFSET(slow_allocations)
619
620 #undef TLAB_FIELD_OFFSET
621
622 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
623
624 public:
625 volatile intptr_t _Stalled;
626 volatile int _TypeTag;
627 ParkEvent * _ParkEvent; // for synchronized()
628 ParkEvent * _SleepEvent; // for Thread.sleep
629 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
630 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
631 int NativeSyncRecursion; // diagnostic
632
633 volatile int _OnTrap; // Resume-at IP delta
634 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
635 jint _hashStateX; // thread-specific hashCode generator state
636 jint _hashStateY;
637 jint _hashStateZ;
638 void * _schedctl;
639
640
641 volatile jint rng[4]; // RNG for spin loop
642
643 // Low-level leaf-lock primitives used to implement synchronization
644 // and native monitor-mutex infrastructure.
645 // Not for general synchronization use.
646 static void SpinAcquire(volatile int * Lock, const char * Name);
647 static void SpinRelease(volatile int * Lock);
648 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
649 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
650 static void muxRelease(volatile intptr_t * Lock);
651 };
652
653 // Inline implementation of Thread::current()
654 inline Thread* Thread::current() {
655 return _thr_current;
656 }
657
658 // Name support for threads. non-JavaThread subclasses with multiple
659 // uniquely named instances should derive from this.
660 class NamedThread: public Thread {
661 friend class VMStructs;
662 enum {
663 max_name_len = 64
664 };
665 private:
666 char* _name;
667 // log JavaThread being processed by oops_do
668 JavaThread* _processed_thread;
669 uint _gc_id; // The current GC id when a thread takes part in GC
670
671 public:
672 NamedThread();
673 ~NamedThread();
674 // May only be called once per thread.
675 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
676 void initialize_named_thread();
677 virtual bool is_Named_thread() const { return true; }
678 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
679 JavaThread *processed_thread() { return _processed_thread; }
680 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
681 virtual void print_on(outputStream* st) const;
682
683 void set_gc_id(uint gc_id) { _gc_id = gc_id; }
684 uint gc_id() { return _gc_id; }
685 };
686
687 // Worker threads are named and have an id of an assigned work.
688 class WorkerThread: public NamedThread {
689 private:
690 uint _id;
691 public:
692 WorkerThread() : _id(0) { }
693 virtual bool is_Worker_thread() const { return true; }
694
695 virtual WorkerThread* as_Worker_thread() const {
696 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
697 return (WorkerThread*) this;
698 }
699
700 void set_id(uint work_id) { _id = work_id; }
701 uint id() const { return _id; }
702 };
703
704 // A single WatcherThread is used for simulating timer interrupts.
705 class WatcherThread: public Thread {
706 friend class VMStructs;
707 public:
708 virtual void run();
709
710 private:
711 static WatcherThread* _watcher_thread;
712
713 static bool _startable;
714 // volatile due to at least one lock-free read
715 volatile static bool _should_terminate;
716
717 os::WatcherThreadCrashProtection* _crash_protection;
718 public:
719 enum SomeConstants {
720 delay_interval = 10 // interrupt delay in milliseconds
721 };
722
723 // Constructor
724 WatcherThread();
725
726 // Tester
727 bool is_Watcher_thread() const { return true; }
728
729 // Printing
730 char* name() const { return (char*)"VM Periodic Task Thread"; }
731 void print_on(outputStream* st) const;
732 void unpark();
733
734 // Returns the single instance of WatcherThread
735 static WatcherThread* watcher_thread() { return _watcher_thread; }
736
737 // Create and start the single instance of WatcherThread, or stop it on shutdown
738 static void start();
739 static void stop();
740 // Only allow start once the VM is sufficiently initialized
741 // Otherwise the first task to enroll will trigger the start
742 static void make_startable();
743
744 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
745 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
746 _crash_protection = crash_protection;
747 }
748
749 bool has_crash_protection() const { return _crash_protection != NULL; }
750 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
751
752 private:
753 int sleep() const;
754 };
755
756
757 class CompilerThread;
758
759 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
760
761 class JavaThread: public Thread {
762 friend class VMStructs;
763 friend class WhiteBox;
764 private:
765 JavaThread* _next; // The next thread in the Threads list
766 oop _threadObj; // The Java level thread object
767
768 #ifdef ASSERT
769 private:
770 int _java_call_counter;
771
772 public:
773 int java_call_counter() { return _java_call_counter; }
774 void inc_java_call_counter() { _java_call_counter++; }
775 void dec_java_call_counter() {
776 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
777 _java_call_counter--;
778 }
779 private: // restore original namespace restriction
780 #endif // ifdef ASSERT
781
782 #ifndef PRODUCT
783 public:
784 enum {
785 jump_ring_buffer_size = 16
786 };
787 private: // restore original namespace restriction
788 #endif
789
790 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
791
792 ThreadFunction _entry_point;
793
794 JNIEnv _jni_environment;
795
796 // Deopt support
797 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
798
799 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
800 // transition out of native
801 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
802 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
803 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
804 // Because deoptimization is lazy we must save jvmti requests to set locals
805 // in compiled frames until we deoptimize and we have an interpreter frame.
806 // This holds the pointer to array (yeah like there might be more than one) of
807 // description of compiled vframes that have locals that need to be updated.
808 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
809
810 // Handshake value for fixing 6243940. We need a place for the i2c
811 // adapter to store the callee Method*. This value is NEVER live
812 // across a gc point so it does NOT have to be gc'd
813 // The handshake is open ended since we can't be certain that it will
814 // be NULLed. This is because we rarely ever see the race and end up
815 // in handle_wrong_method which is the backend of the handshake. See
816 // code in i2c adapters and handle_wrong_method.
817
818 Method* _callee_target;
819
820 // Used to pass back results to the interpreter or generated code running Java code.
821 oop _vm_result; // oop result is GC-preserved
822 Metadata* _vm_result_2; // non-oop result
823
824 // See ReduceInitialCardMarks: this holds the precise space interval of
825 // the most recent slow path allocation for which compiled code has
826 // elided card-marks for performance along the fast-path.
827 MemRegion _deferred_card_mark;
828
829 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
830 // allocated during deoptimization
831 // and by JNI_MonitorEnter/Exit
832
833 // Async. requests support
834 enum AsyncRequests {
835 _no_async_condition = 0,
836 _async_exception,
837 _async_unsafe_access_error
838 };
839 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
840 oop _pending_async_exception;
841
842 // Safepoint support
843 public: // Expose _thread_state for SafeFetchInt()
844 volatile JavaThreadState _thread_state;
845 private:
846 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
847 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
848
849 // JavaThread termination support
850 enum TerminatedTypes {
851 _not_terminated = 0xDEAD - 2,
852 _thread_exiting, // JavaThread::exit() has been called for this thread
853 _thread_terminated, // JavaThread is removed from thread list
854 _vm_exited // JavaThread is still executing native code, but VM is terminated
855 // only VM_Exit can set _vm_exited
856 };
857
858 // In general a JavaThread's _terminated field transitions as follows:
859 //
860 // _not_terminated => _thread_exiting => _thread_terminated
861 //
862 // _vm_exited is a special value to cover the case of a JavaThread
863 // executing native code after the VM itself is terminated.
864 volatile TerminatedTypes _terminated;
865 // suspend/resume support
866 volatile bool _suspend_equivalent; // Suspend equivalent condition
867 jint _in_deopt_handler; // count of deoptimization
868 // handlers thread is in
869 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
870 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
871 // never locked) when throwing an exception. Used by interpreter only.
872
873 // JNI attach states:
874 enum JNIAttachStates {
875 _not_attaching_via_jni = 1, // thread is not attaching via JNI
876 _attaching_via_jni, // thread is attaching via JNI
877 _attached_via_jni // thread has attached via JNI
878 };
879
880 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
881 // A native thread that is attaching via JNI starts with a value
882 // of _attaching_via_jni and transitions to _attached_via_jni.
883 volatile JNIAttachStates _jni_attach_state;
884
885 public:
886 // State of the stack guard pages for this thread.
887 enum StackGuardState {
888 stack_guard_unused, // not needed
889 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
890 stack_guard_enabled // enabled
891 };
892
893 private:
894
895 #if INCLUDE_JVMCI
896 // The _pending_* fields below are used to communicate extra information
897 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
898
899 // Communicates the DeoptReason and DeoptAction of the uncommon trap
900 int _pending_deoptimization;
901
902 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
903 // before the monitor has been acquired.
904 bool _pending_monitorenter;
905
906 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
907 bool _pending_transfer_to_interpreter;
908
909 // An object that JVMCI compiled code can use to further describe and
910 // uniquely identify the speculative optimization guarded by the uncommon trap
911 oop _pending_failed_speculation;
912
913 // These fields are mutually exclusive in terms of live ranges.
914 union {
915 // Communicates the pc at which the most recent implicit exception occurred
916 // from the signal handler to a deoptimization stub.
917 address _implicit_exception_pc;
918
919 // Communicates an alternative call target to an i2c stub from a JavaCall .
920 address _alternate_call_target;
921 } _jvmci;
922
923 // Support for high precision, thread sensitive counters in JVMCI compiled code.
924 jlong* _jvmci_counters;
925
926 public:
927 static jlong* _jvmci_old_thread_counters;
928 static void collect_counters(typeArrayOop array);
929 private:
930 #endif // INCLUDE_JVMCI
931
932 StackGuardState _stack_guard_state;
933
934 // Precompute the limit of the stack as used in stack overflow checks.
935 // We load it from here to simplify the stack overflow check in assembly.
936 address _stack_overflow_limit;
937
938 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
939 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
940 // code)
941 volatile oop _exception_oop; // Exception thrown in compiled code
942 volatile address _exception_pc; // PC where exception happened
943 volatile address _exception_handler_pc; // PC for handler of exception
944 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
945
946 private:
947 // support for JNI critical regions
948 jint _jni_active_critical; // count of entries into JNI critical region
949
950 // Checked JNI: function name requires exception check
951 char* _pending_jni_exception_check_fn;
952
953 // For deadlock detection.
954 int _depth_first_number;
955
956 // JVMTI PopFrame support
957 // This is set to popframe_pending to signal that top Java frame should be popped immediately
958 int _popframe_condition;
959
960 // If reallocation of scalar replaced objects fails, we throw OOM
961 // and during exception propagation, pop the top
962 // _frames_to_pop_failed_realloc frames, the ones that reference
963 // failed reallocations.
964 int _frames_to_pop_failed_realloc;
965
966 #ifndef PRODUCT
967 int _jmp_ring_index;
968 struct {
969 // We use intptr_t instead of address so debugger doesn't try and display strings
970 intptr_t _target;
971 intptr_t _instruction;
972 const char* _file;
973 int _line;
974 } _jmp_ring[jump_ring_buffer_size];
975 #endif // PRODUCT
976
977 #if INCLUDE_ALL_GCS
978 // Support for G1 barriers
979
980 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
981 // Set of all such queues.
982 static SATBMarkQueueSet _satb_mark_queue_set;
983
984 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
985 // Set of all such queues.
986 static DirtyCardQueueSet _dirty_card_queue_set;
987
988 void flush_barrier_queues();
989 #endif // INCLUDE_ALL_GCS
990
991 friend class VMThread;
992 friend class ThreadWaitTransition;
993 friend class VM_Exit;
994
995 void initialize(); // Initialized the instance variables
996
997 public:
998 // Constructor
999 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1000 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1001 ~JavaThread();
1002
1003 #ifdef ASSERT
1004 // verify this JavaThread hasn't be published in the Threads::list yet
1005 void verify_not_published();
1006 #endif
1007
1008 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1009 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1010 _jni_environment.functions = functionTable;
1011 }
1012 struct JNINativeInterface_* get_jni_functions() {
1013 return (struct JNINativeInterface_ *)_jni_environment.functions;
1014 }
1015
1016 // This function is called at thread creation to allow
1017 // platform specific thread variables to be initialized.
1018 void cache_global_variables();
1019
1020 // Executes Shutdown.shutdown()
1021 void invoke_shutdown_hooks();
1022
1023 // Cleanup on thread exit
1024 enum ExitType {
1025 normal_exit,
1026 jni_detach
1027 };
1028 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1029
1030 void cleanup_failed_attach_current_thread();
1031
1032 // Testers
1033 virtual bool is_Java_thread() const { return true; }
1034 virtual bool can_call_java() const { return true; }
1035
1036 // Thread chain operations
1037 JavaThread* next() const { return _next; }
1038 void set_next(JavaThread* p) { _next = p; }
1039
1040 // Thread oop. threadObj() can be NULL for initial JavaThread
1041 // (or for threads attached via JNI)
1042 oop threadObj() const { return _threadObj; }
1043 void set_threadObj(oop p) { _threadObj = p; }
1044
1045 ThreadPriority java_priority() const; // Read from threadObj()
1046
1047 // Prepare thread and add to priority queue. If a priority is
1048 // not specified, use the priority of the thread object. Threads_lock
1049 // must be held while this function is called.
1050 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1051 void prepare_ext();
1052
1053 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1054 address saved_exception_pc() { return _saved_exception_pc; }
1055
1056
1057 ThreadFunction entry_point() const { return _entry_point; }
1058
1059 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1060 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1061
1062 // Last frame anchor routines
1063
1064 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1065
1066 // last_Java_sp
1067 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1068 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1069
1070 // last_Java_pc
1071
1072 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1073
1074 // Safepoint support
1075 #if !(defined(PPC64) || defined(AARCH64))
1076 JavaThreadState thread_state() const { return _thread_state; }
1077 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1078 #else
1079 // Use membars when accessing volatile _thread_state. See
1080 // Threads::create_vm() for size checks.
1081 inline JavaThreadState thread_state() const;
1082 inline void set_thread_state(JavaThreadState s);
1083 #endif
1084 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1085 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1086 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1087
1088 // thread has called JavaThread::exit() or is terminated
1089 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1090 // thread is terminated (no longer on the threads list); we compare
1091 // against the two non-terminated values so that a freed JavaThread
1092 // will also be considered terminated.
1093 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1094 void set_terminated(TerminatedTypes t) { _terminated = t; }
1095 // special for Threads::remove() which is static:
1096 void set_terminated_value() { _terminated = _thread_terminated; }
1097 void block_if_vm_exited();
1098
1099 bool doing_unsafe_access() { return _doing_unsafe_access; }
1100 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1101
1102 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1103 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1104
1105 // Suspend/resume support for JavaThread
1106 private:
1107 inline void set_ext_suspended();
1108 inline void clear_ext_suspended();
1109
1110 public:
1111 void java_suspend();
1112 void java_resume();
1113 int java_suspend_self();
1114
1115 void check_and_wait_while_suspended() {
1116 assert(JavaThread::current() == this, "sanity check");
1117
1118 bool do_self_suspend;
1119 do {
1120 // were we externally suspended while we were waiting?
1121 do_self_suspend = handle_special_suspend_equivalent_condition();
1122 if (do_self_suspend) {
1123 // don't surprise the thread that suspended us by returning
1124 java_suspend_self();
1125 set_suspend_equivalent();
1126 }
1127 } while (do_self_suspend);
1128 }
1129 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1130 // Check for async exception in addition to safepoint and suspend request.
1131 static void check_special_condition_for_native_trans(JavaThread *thread);
1132
1133 // Same as check_special_condition_for_native_trans but finishes the
1134 // transition into thread_in_Java mode so that it can potentially
1135 // block.
1136 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1137
1138 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1139 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1140 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1141 // Warning: is_ext_suspend_completed() may temporarily drop the
1142 // SR_lock to allow the thread to reach a stable thread state if
1143 // it is currently in a transient thread state.
1144 return is_ext_suspend_completed(false /* !called_by_wait */,
1145 SuspendRetryDelay, bits);
1146 }
1147
1148 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1149 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1150 // passed as the count and delay parameters. Experiments with specific
1151 // calls to wait_for_ext_suspend_completion() can be done by passing
1152 // other values in the code. Experiments with all calls can be done
1153 // via the appropriate -XX options.
1154 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1155
1156 inline void set_external_suspend();
1157 inline void clear_external_suspend();
1158
1159 inline void set_deopt_suspend();
1160 inline void clear_deopt_suspend();
1161 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1162
1163 bool is_external_suspend() const {
1164 return (_suspend_flags & _external_suspend) != 0;
1165 }
1166 // Whenever a thread transitions from native to vm/java it must suspend
1167 // if external|deopt suspend is present.
1168 bool is_suspend_after_native() const {
1169 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1170 }
1171
1172 // external suspend request is completed
1173 bool is_ext_suspended() const {
1174 return (_suspend_flags & _ext_suspended) != 0;
1175 }
1176
1177 bool is_external_suspend_with_lock() const {
1178 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1179 return is_external_suspend();
1180 }
1181
1182 // Special method to handle a pending external suspend request
1183 // when a suspend equivalent condition lifts.
1184 bool handle_special_suspend_equivalent_condition() {
1185 assert(is_suspend_equivalent(),
1186 "should only be called in a suspend equivalence condition");
1187 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1188 bool ret = is_external_suspend();
1189 if (!ret) {
1190 // not about to self-suspend so clear suspend equivalence
1191 clear_suspend_equivalent();
1192 }
1193 // implied else:
1194 // We have a pending external suspend request so we leave the
1195 // suspend_equivalent flag set until java_suspend_self() sets
1196 // the ext_suspended flag and clears the suspend_equivalent
1197 // flag. This insures that wait_for_ext_suspend_completion()
1198 // will return consistent values.
1199 return ret;
1200 }
1201
1202 // utility methods to see if we are doing some kind of suspension
1203 bool is_being_ext_suspended() const {
1204 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1205 return is_ext_suspended() || is_external_suspend();
1206 }
1207
1208 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1209
1210 void set_suspend_equivalent() { _suspend_equivalent = true; }
1211 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1212
1213 // Thread.stop support
1214 void send_thread_stop(oop throwable);
1215 AsyncRequests clear_special_runtime_exit_condition() {
1216 AsyncRequests x = _special_runtime_exit_condition;
1217 _special_runtime_exit_condition = _no_async_condition;
1218 return x;
1219 }
1220
1221 // Are any async conditions present?
1222 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1223
1224 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1225
1226 // these next two are also used for self-suspension and async exception support
1227 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1228
1229 // Return true if JavaThread has an asynchronous condition or
1230 // if external suspension is requested.
1231 bool has_special_runtime_exit_condition() {
1232 // We call is_external_suspend() last since external suspend should
1233 // be less common. Because we don't use is_external_suspend_with_lock
1234 // it is possible that we won't see an asynchronous external suspend
1235 // request that has just gotten started, i.e., SR_lock grabbed but
1236 // _external_suspend field change either not made yet or not visible
1237 // yet. However, this is okay because the request is asynchronous and
1238 // we will see the new flag value the next time through. It's also
1239 // possible that the external suspend request is dropped after
1240 // we have checked is_external_suspend(), we will recheck its value
1241 // under SR_lock in java_suspend_self().
1242 return (_special_runtime_exit_condition != _no_async_condition) ||
1243 is_external_suspend() || is_deopt_suspend();
1244 }
1245
1246 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1247
1248 inline void set_pending_async_exception(oop e);
1249
1250 // Fast-locking support
1251 bool is_lock_owned(address adr) const;
1252
1253 // Accessors for vframe array top
1254 // The linked list of vframe arrays are sorted on sp. This means when we
1255 // unpack the head must contain the vframe array to unpack.
1256 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1257 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1258
1259 // Side structure for deferring update of java frame locals until deopt occurs
1260 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1261 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1262
1263 // These only really exist to make debugging deopt problems simpler
1264
1265 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1266 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1267
1268 // The special resourceMark used during deoptimization
1269
1270 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1271 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1272
1273 intptr_t* must_deopt_id() { return _must_deopt_id; }
1274 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1275 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1276
1277 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1278 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1279
1280 Method* callee_target() const { return _callee_target; }
1281 void set_callee_target (Method* x) { _callee_target = x; }
1282
1283 // Oop results of vm runtime calls
1284 oop vm_result() const { return _vm_result; }
1285 void set_vm_result (oop x) { _vm_result = x; }
1286
1287 Metadata* vm_result_2() const { return _vm_result_2; }
1288 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1289
1290 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1291 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1292
1293 #if INCLUDE_JVMCI
1294 int pending_deoptimization() const { return _pending_deoptimization; }
1295 oop pending_failed_speculation() const { return _pending_failed_speculation; }
1296 bool has_pending_monitorenter() const { return _pending_monitorenter; }
1297 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
1298 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
1299 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; }
1300 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
1301 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
1302 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
1303 #endif // INCLUDE_JVMCI
1304
1305 // Exception handling for compiled methods
1306 oop exception_oop() const { return _exception_oop; }
1307 address exception_pc() const { return _exception_pc; }
1308 address exception_handler_pc() const { return _exception_handler_pc; }
1309 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1310
1311 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1312 void set_exception_pc(address a) { _exception_pc = a; }
1313 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1314 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1315
1316 void clear_exception_oop_and_pc() {
1317 set_exception_oop(NULL);
1318 set_exception_pc(NULL);
1319 }
1320
1321 // Stack overflow support
1322 inline size_t stack_available(address cur_sp);
1323 address stack_yellow_zone_base() {
1324 return (address)(stack_base() -
1325 (stack_size() -
1326 (stack_red_zone_size() + stack_yellow_zone_size())));
1327 }
1328 size_t stack_yellow_zone_size() {
1329 return StackYellowPages * os::vm_page_size();
1330 }
1331 address stack_red_zone_base() {
1332 return (address)(stack_base() - (stack_size() - stack_red_zone_size()));
1333 }
1334 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); }
1335 bool in_stack_yellow_zone(address a) {
1336 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base());
1337 }
1338 bool in_stack_red_zone(address a) {
1339 return (a <= stack_red_zone_base()) &&
1340 (a >= (address)((intptr_t)stack_base() - stack_size()));
1341 }
1342
1343 void create_stack_guard_pages();
1344 void remove_stack_guard_pages();
1345
1346 void enable_stack_yellow_zone();
1347 void disable_stack_yellow_zone();
1348 void enable_stack_red_zone();
1349 void disable_stack_red_zone();
1350
1351 inline bool stack_guard_zone_unused();
1352 inline bool stack_yellow_zone_disabled();
1353 inline bool stack_yellow_zone_enabled();
1354
1355 // Attempt to reguard the stack after a stack overflow may have occurred.
1356 // Returns true if (a) guard pages are not needed on this thread, (b) the
1357 // pages are already guarded, or (c) the pages were successfully reguarded.
1358 // Returns false if there is not enough stack space to reguard the pages, in
1359 // which case the caller should unwind a frame and try again. The argument
1360 // should be the caller's (approximate) sp.
1361 bool reguard_stack(address cur_sp);
1362 // Similar to above but see if current stackpoint is out of the guard area
1363 // and reguard if possible.
1364 bool reguard_stack(void);
1365
1366 address stack_overflow_limit() { return _stack_overflow_limit; }
1367 void set_stack_overflow_limit() {
1368 _stack_overflow_limit = _stack_base - _stack_size +
1369 ((StackShadowPages +
1370 StackYellowPages +
1371 StackRedPages) * os::vm_page_size());
1372 }
1373
1374 // Misc. accessors/mutators
1375 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1376 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1377 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1378
1379 #ifndef PRODUCT
1380 void record_jump(address target, address instr, const char* file, int line);
1381 #endif // PRODUCT
1382
1383 // For assembly stub generation
1384 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1385 #ifndef PRODUCT
1386 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1387 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1388 #endif // PRODUCT
1389 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1390 static ByteSize last_Java_sp_offset() {
1391 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1392 }
1393 static ByteSize last_Java_pc_offset() {
1394 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1395 }
1396 static ByteSize frame_anchor_offset() {
1397 return byte_offset_of(JavaThread, _anchor);
1398 }
1399 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1400 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1401 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1402 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1403 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1404 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1405 #if INCLUDE_JVMCI
1406 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
1407 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
1408 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); }
1409 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
1410 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
1411 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
1412 #endif // INCLUDE_JVMCI
1413 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1414 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1415 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1416 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1417 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1418 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1419 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1420
1421 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1422 static ByteSize should_post_on_exceptions_flag_offset() {
1423 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1424 }
1425
1426 #if INCLUDE_ALL_GCS
1427 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1428 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1429 #endif // INCLUDE_ALL_GCS
1430
1431 // Returns the jni environment for this thread
1432 JNIEnv* jni_environment() { return &_jni_environment; }
1433
1434 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1435 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1436 // Only return NULL if thread is off the thread list; starting to
1437 // exit should not return NULL.
1438 if (thread_from_jni_env->is_terminated()) {
1439 thread_from_jni_env->block_if_vm_exited();
1440 return NULL;
1441 } else {
1442 return thread_from_jni_env;
1443 }
1444 }
1445
1446 // JNI critical regions. These can nest.
1447 bool in_critical() { return _jni_active_critical > 0; }
1448 bool in_last_critical() { return _jni_active_critical == 1; }
1449 void enter_critical() {
1450 assert(Thread::current() == this ||
1451 (Thread::current()->is_VM_thread() &&
1452 SafepointSynchronize::is_synchronizing()),
1453 "this must be current thread or synchronizing");
1454 _jni_active_critical++;
1455 }
1456 void exit_critical() {
1457 assert(Thread::current() == this, "this must be current thread");
1458 _jni_active_critical--;
1459 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1460 }
1461
1462 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1463 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1464 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1465 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1466 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1467
1468 // For deadlock detection
1469 int depth_first_number() { return _depth_first_number; }
1470 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1471
1472 private:
1473 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1474
1475 public:
1476 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1477 void add_monitor_chunk(MonitorChunk* chunk);
1478 void remove_monitor_chunk(MonitorChunk* chunk);
1479 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1480 void inc_in_deopt_handler() { _in_deopt_handler++; }
1481 void dec_in_deopt_handler() {
1482 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1483 if (_in_deopt_handler > 0) { // robustness
1484 _in_deopt_handler--;
1485 }
1486 }
1487
1488 private:
1489 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1490
1491 public:
1492
1493 // Frame iteration; calls the function f for all frames on the stack
1494 void frames_do(void f(frame*, const RegisterMap*));
1495
1496 // Memory operations
1497 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1498
1499 // Sweeper operations
1500 void nmethods_do(CodeBlobClosure* cf);
1501
1502 // RedefineClasses Support
1503 void metadata_do(void f(Metadata*));
1504
1505 // Misc. operations
1506 char* name() const { return (char*)get_thread_name(); }
1507 void print_on(outputStream* st) const;
1508 void print_value();
1509 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1510 void print_thread_state() const PRODUCT_RETURN;
1511 void print_on_error(outputStream* st, char* buf, int buflen) const;
1512 void verify();
1513 const char* get_thread_name() const;
1514 private:
1515 // factor out low-level mechanics for use in both normal and error cases
1516 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1517 public:
1518 const char* get_threadgroup_name() const;
1519 const char* get_parent_name() const;
1520
1521 // Accessing frames
1522 frame last_frame() {
1523 _anchor.make_walkable(this);
1524 return pd_last_frame();
1525 }
1526 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1527
1528 // Returns method at 'depth' java or native frames down the stack
1529 // Used for security checks
1530 Klass* security_get_caller_class(int depth);
1531
1532 // Print stack trace in external format
1533 void print_stack_on(outputStream* st);
1534 void print_stack() { print_stack_on(tty); }
1535
1536 // Print stack traces in various internal formats
1537 void trace_stack() PRODUCT_RETURN;
1538 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1539 void trace_frames() PRODUCT_RETURN;
1540 void trace_oops() PRODUCT_RETURN;
1541
1542 // Print an annotated view of the stack frames
1543 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1544 void validate_frame_layout() {
1545 print_frame_layout(0, true);
1546 }
1547
1548 // Returns the number of stack frames on the stack
1549 int depth() const;
1550
1551 // Function for testing deoptimization
1552 void deoptimize();
1553 void make_zombies();
1554
1555 void deoptimized_wrt_marked_nmethods();
1556
1557 // Profiling operation (see fprofile.cpp)
1558 public:
1559 bool profile_last_Java_frame(frame* fr);
1560
1561 private:
1562 ThreadProfiler* _thread_profiler;
1563 private:
1564 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1565 friend class FlatProfilerTask; // uses get_thread_profiler.
1566 friend class ThreadProfilerMark; // uses get_thread_profiler.
1567 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1568 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1569 ThreadProfiler* result = _thread_profiler;
1570 _thread_profiler = tp;
1571 return result;
1572 }
1573
1574 public:
1575 // Returns the running thread as a JavaThread
1576 static inline JavaThread* current();
1577
1578 // Returns the active Java thread. Do not use this if you know you are calling
1579 // from a JavaThread, as it's slower than JavaThread::current. If called from
1580 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1581 // operation. You may not want that either.
1582 static JavaThread* active();
1583
1584 inline CompilerThread* as_CompilerThread();
1585
1586 public:
1587 virtual void run();
1588 void thread_main_inner();
1589
1590 private:
1591 // PRIVILEGED STACK
1592 PrivilegedElement* _privileged_stack_top;
1593 GrowableArray<oop>* _array_for_gc;
1594 public:
1595
1596 // Returns the privileged_stack information.
1597 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1598 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1599 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1600
1601 public:
1602 // Thread local information maintained by JVMTI.
1603 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1604 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1605 // getter is used to get this JavaThread's JvmtiThreadState if it has
1606 // one which means NULL can be returned. JvmtiThreadState::state_for()
1607 // is used to get the specified JavaThread's JvmtiThreadState if it has
1608 // one or it allocates a new JvmtiThreadState for the JavaThread and
1609 // returns it. JvmtiThreadState::state_for() will return NULL only if
1610 // the specified JavaThread is exiting.
1611 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1612 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1613 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1614 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1615
1616 // JVMTI PopFrame support
1617 // Setting and clearing popframe_condition
1618 // All of these enumerated values are bits. popframe_pending
1619 // indicates that a PopFrame() has been requested and not yet been
1620 // completed. popframe_processing indicates that that PopFrame() is in
1621 // the process of being completed. popframe_force_deopt_reexecution_bit
1622 // indicates that special handling is required when returning to a
1623 // deoptimized caller.
1624 enum PopCondition {
1625 popframe_inactive = 0x00,
1626 popframe_pending_bit = 0x01,
1627 popframe_processing_bit = 0x02,
1628 popframe_force_deopt_reexecution_bit = 0x04
1629 };
1630 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1631 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1632 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1633 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1634 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1635 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1636 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1637 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1638 #ifdef CC_INTERP
1639 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1640 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1641 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1642 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1643 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1644 #endif
1645
1646 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1647 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1648 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1649
1650 private:
1651 // Saved incoming arguments to popped frame.
1652 // Used only when popped interpreted frame returns to deoptimized frame.
1653 void* _popframe_preserved_args;
1654 int _popframe_preserved_args_size;
1655
1656 public:
1657 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1658 void* popframe_preserved_args();
1659 ByteSize popframe_preserved_args_size();
1660 WordSize popframe_preserved_args_size_in_words();
1661 void popframe_free_preserved_args();
1662
1663
1664 private:
1665 JvmtiThreadState *_jvmti_thread_state;
1666 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1667
1668 // Used by the interpreter in fullspeed mode for frame pop, method
1669 // entry, method exit and single stepping support. This field is
1670 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1671 // It can be set to zero asynchronously (i.e., without a VM operation
1672 // or a lock) so we have to be very careful.
1673 int _interp_only_mode;
1674
1675 public:
1676 // used by the interpreter for fullspeed debugging support (see above)
1677 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1678 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1679 int get_interp_only_mode() { return _interp_only_mode; }
1680 void increment_interp_only_mode() { ++_interp_only_mode; }
1681 void decrement_interp_only_mode() { --_interp_only_mode; }
1682
1683 // support for cached flag that indicates whether exceptions need to be posted for this thread
1684 // if this is false, we can avoid deoptimizing when events are thrown
1685 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1686 private:
1687 int _should_post_on_exceptions_flag;
1688
1689 public:
1690 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1691 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1692
1693 private:
1694 ThreadStatistics *_thread_stat;
1695
1696 public:
1697 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1698
1699 // Return a blocker object for which this thread is blocked parking.
1700 oop current_park_blocker();
1701
1702 private:
1703 static size_t _stack_size_at_create;
1704
1705 public:
1706 static inline size_t stack_size_at_create(void) {
1707 return _stack_size_at_create;
1708 }
1709 static inline void set_stack_size_at_create(size_t value) {
1710 _stack_size_at_create = value;
1711 }
1712
1713 #if INCLUDE_ALL_GCS
1714 // SATB marking queue support
1715 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1716 static SATBMarkQueueSet& satb_mark_queue_set() {
1717 return _satb_mark_queue_set;
1718 }
1719
1720 // Dirty card queue support
1721 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1722 static DirtyCardQueueSet& dirty_card_queue_set() {
1723 return _dirty_card_queue_set;
1724 }
1725 #endif // INCLUDE_ALL_GCS
1726
1727 // This method initializes the SATB and dirty card queues before a
1728 // JavaThread is added to the Java thread list. Right now, we don't
1729 // have to do anything to the dirty card queue (it should have been
1730 // activated when the thread was created), but we have to activate
1731 // the SATB queue if the thread is created while a marking cycle is
1732 // in progress. The activation / de-activation of the SATB queues at
1733 // the beginning / end of a marking cycle is done during safepoints
1734 // so we have to make sure this method is called outside one to be
1735 // able to safely read the active field of the SATB queue set. Right
1736 // now, it is called just before the thread is added to the Java
1737 // thread list in the Threads::add() method. That method is holding
1738 // the Threads_lock which ensures we are outside a safepoint. We
1739 // cannot do the obvious and set the active field of the SATB queue
1740 // when the thread is created given that, in some cases, safepoints
1741 // might happen between the JavaThread constructor being called and the
1742 // thread being added to the Java thread list (an example of this is
1743 // when the structure for the DestroyJavaVM thread is created).
1744 #if INCLUDE_ALL_GCS
1745 void initialize_queues();
1746 #else // INCLUDE_ALL_GCS
1747 void initialize_queues() { }
1748 #endif // INCLUDE_ALL_GCS
1749
1750 // Machine dependent stuff
1751 #ifdef TARGET_OS_ARCH_linux_x86
1752 # include "thread_linux_x86.hpp"
1753 #endif
1754 #ifdef TARGET_OS_ARCH_linux_sparc
1755 # include "thread_linux_sparc.hpp"
1756 #endif
1757 #ifdef TARGET_OS_ARCH_linux_zero
1758 # include "thread_linux_zero.hpp"
1759 #endif
1760 #ifdef TARGET_OS_ARCH_solaris_x86
1761 # include "thread_solaris_x86.hpp"
1762 #endif
1763 #ifdef TARGET_OS_ARCH_solaris_sparc
1764 # include "thread_solaris_sparc.hpp"
1765 #endif
1766 #ifdef TARGET_OS_ARCH_windows_x86
1767 # include "thread_windows_x86.hpp"
1768 #endif
1769 #ifdef TARGET_OS_ARCH_linux_arm
1770 # include "thread_linux_arm.hpp"
1771 #endif
1772 #ifdef TARGET_OS_ARCH_linux_ppc
1773 # include "thread_linux_ppc.hpp"
1774 #endif
1775 #ifdef TARGET_OS_ARCH_linux_aarch64
1776 # include "thread_linux_aarch64.hpp"
1777 #endif
1778 #ifdef TARGET_OS_ARCH_aix_ppc
1779 # include "thread_aix_ppc.hpp"
1780 #endif
1781 #ifdef TARGET_OS_ARCH_bsd_x86
1782 # include "thread_bsd_x86.hpp"
1783 #endif
1784 #ifdef TARGET_OS_ARCH_bsd_zero
1785 # include "thread_bsd_zero.hpp"
1786 #endif
1787
1788
1789 public:
1790 void set_blocked_on_compilation(bool value) {
1791 _blocked_on_compilation = value;
1792 }
1793
1794 bool blocked_on_compilation() {
1795 return _blocked_on_compilation;
1796 }
1797 protected:
1798 bool _blocked_on_compilation;
1799
1800
1801 // JSR166 per-thread parker
1802 private:
1803 Parker* _parker;
1804 public:
1805 Parker* parker() { return _parker; }
1806
1807 // Biased locking support
1808 private:
1809 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1810 public:
1811 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1812 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1813
1814 // clearing/querying jni attach status
1815 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1816 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1817 inline void set_done_attaching_via_jni();
1818 private:
1819 // This field is used to determine if a thread has claimed
1820 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1821 // otherwise its value is the par_id that has been claimed.
1822 uint _claimed_par_id;
1823 public:
1824 uint get_claimed_par_id() { return _claimed_par_id; }
1825 void set_claimed_par_id(uint id) { _claimed_par_id = id; }
1826 };
1827
1828 // Inline implementation of JavaThread::current
1829 inline JavaThread* JavaThread::current() {
1830 Thread* thread = Thread::current();
1831 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1832 return (JavaThread*)thread;
1833 }
1834
1835 inline CompilerThread* JavaThread::as_CompilerThread() {
1836 assert(is_Compiler_thread(), "just checking");
1837 return (CompilerThread*)this;
1838 }
1839
1840 // Dedicated thread to sweep the code cache
1841 class CodeCacheSweeperThread : public JavaThread {
1842 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1843 public:
1844 CodeCacheSweeperThread();
1845 // Track the nmethod currently being scanned by the sweeper
1846 void set_scanned_nmethod(nmethod* nm) {
1847 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1848 _scanned_nmethod = nm;
1849 }
1850
1851 // Hide sweeper thread from external view.
1852 bool is_hidden_from_external_view() const { return true; }
1853
1854 bool is_Code_cache_sweeper_thread() const { return true; }
1855 // GC support
1856 // Apply "f->do_oop" to all root oops in "this".
1857 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1858 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1859 };
1860
1861 // A thread used for Compilation.
1862 class CompilerThread : public JavaThread {
1863 friend class VMStructs;
1864 private:
1865 CompilerCounters* _counters;
1866
1867 ciEnv* _env;
1868 CompileLog* _log;
1869 CompileTask* _task;
1870 CompileQueue* _queue;
1871 BufferBlob* _buffer_blob;
1872
1873 AbstractCompiler* _compiler;
1874
1875 public:
1876
1877 static CompilerThread* current();
1878
1879 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1880
1881 bool is_Compiler_thread() const { return true; }
1882
1883 virtual bool can_call_java() const;
1884
1885 // Hide native compiler threads from external view.
1886 bool is_hidden_from_external_view() const { return !can_call_java(); }
1887
1888 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1889 AbstractCompiler* compiler() const { return _compiler; }
1890
1891 CompileQueue* queue() const { return _queue; }
1892 CompilerCounters* counters() const { return _counters; }
1893
1894 // Get/set the thread's compilation environment.
1895 ciEnv* env() { return _env; }
1896 void set_env(ciEnv* env) { _env = env; }
1897
1898 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1899 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
1900
1901 // Get/set the thread's logging information
1902 CompileLog* log() { return _log; }
1903 void init_log(CompileLog* log) {
1904 // Set once, for good.
1905 assert(_log == NULL, "set only once");
1906 _log = log;
1907 }
1908
1909 #ifndef PRODUCT
1910 private:
1911 IdealGraphPrinter *_ideal_graph_printer;
1912 public:
1913 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1914 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1915 #endif
1916
1917 // Get/set the thread's current task
1918 CompileTask* task() { return _task; }
1919 void set_task(CompileTask* task) { _task = task; }
1920 };
1921
1922 inline CompilerThread* CompilerThread::current() {
1923 return JavaThread::current()->as_CompilerThread();
1924 }
1925
1926 // The active thread queue. It also keeps track of the current used
1927 // thread priorities.
1928 class Threads: AllStatic {
1929 friend class VMStructs;
1930 private:
1931 static JavaThread* _thread_list;
1932 static int _number_of_threads;
1933 static int _number_of_non_daemon_threads;
1934 static int _return_code;
1935 static int _thread_claim_parity;
1936 #ifdef ASSERT
1937 static bool _vm_complete;
1938 #endif
1939
1940 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
1941 static void initialize_jsr292_core_classes(TRAPS);
1942 public:
1943 // Thread management
1944 // force_daemon is a concession to JNI, where we may need to add a
1945 // thread to the thread list before allocating its thread object
1946 static void add(JavaThread* p, bool force_daemon = false);
1947 static void remove(JavaThread* p);
1948 static bool includes(JavaThread* p);
1949 static JavaThread* first() { return _thread_list; }
1950 static void threads_do(ThreadClosure* tc);
1951
1952 // Initializes the vm and creates the vm thread
1953 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1954 static void convert_vm_init_libraries_to_agents();
1955 static void create_vm_init_libraries();
1956 static void create_vm_init_agents();
1957 static void shutdown_vm_agents();
1958 static bool destroy_vm();
1959 // Supported VM versions via JNI
1960 // Includes JNI_VERSION_1_1
1961 static jboolean is_supported_jni_version_including_1_1(jint version);
1962 // Does not include JNI_VERSION_1_1
1963 static jboolean is_supported_jni_version(jint version);
1964
1965 // The "thread claim parity" provides a way for threads to be claimed
1966 // by parallel worker tasks.
1967 //
1968 // Each thread contains a a "parity" field. A task will claim the
1969 // thread only if its parity field is the same as the global parity,
1970 // which is updated by calling change_thread_claim_parity().
1971 //
1972 // For this to work change_thread_claim_parity() needs to be called
1973 // exactly once in sequential code before starting parallel tasks
1974 // that should claim threads.
1975 //
1976 // New threads get their parity set to 0 and change_thread_claim_parity()
1977 // never set the global parity to 0.
1978 static int thread_claim_parity() { return _thread_claim_parity; }
1979 static void change_thread_claim_parity();
1980 static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
1981
1982 // Apply "f->do_oop" to all root oops in all threads.
1983 // This version may only be called by sequential code.
1984 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1985 // This version may be called by sequential or parallel code.
1986 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1987 // This creates a list of GCTasks, one per thread.
1988 static void create_thread_roots_tasks(GCTaskQueue* q);
1989 // This creates a list of GCTasks, one per thread, for marking objects.
1990 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1991
1992 // Apply "f->do_oop" to roots in all threads that
1993 // are part of compiled frames
1994 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1995
1996 static void convert_hcode_pointers();
1997 static void restore_hcode_pointers();
1998
1999 // Sweeper
2000 static void nmethods_do(CodeBlobClosure* cf);
2001
2002 // RedefineClasses support
2003 static void metadata_do(void f(Metadata*));
2004 static void metadata_handles_do(void f(Metadata*));
2005
2006 #ifdef ASSERT
2007 static bool is_vm_complete() { return _vm_complete; }
2008 #endif
2009
2010 // Verification
2011 static void verify();
2012 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
2013 static void print(bool print_stacks, bool internal_format) {
2014 // this function is only used by debug.cpp
2015 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
2016 }
2017 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2018
2019 // Get Java threads that are waiting to enter a monitor. If doLock
2020 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2021 // VM needs to be at a safepoint.
2022 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2023 address monitor, bool doLock);
2024
2025 // Get owning Java thread from the monitor's owner field. If doLock
2026 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2027 // VM needs to be at a safepoint.
2028 static JavaThread *owning_thread_from_monitor_owner(address owner,
2029 bool doLock);
2030
2031 // Number of threads on the active threads list
2032 static int number_of_threads() { return _number_of_threads; }
2033 // Number of non-daemon threads on the active threads list
2034 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2035
2036 // Deoptimizes all frames tied to marked nmethods
2037 static void deoptimized_wrt_marked_nmethods();
2038
2039 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2040
2041 };
2042
2043
2044 // Thread iterator
2045 class ThreadClosure: public StackObj {
2046 public:
2047 virtual void do_thread(Thread* thread) = 0;
2048 };
2049
2050 class SignalHandlerMark: public StackObj {
2051 private:
2052 Thread* _thread;
2053 public:
2054 SignalHandlerMark(Thread* t) {
2055 _thread = t;
2056 if (_thread) _thread->enter_signal_handler();
2057 }
2058 ~SignalHandlerMark() {
2059 if (_thread) _thread->leave_signal_handler();
2060 _thread = NULL;
2061 }
2062 };
2063
2064
2065 #endif // SHARE_VM_RUNTIME_THREAD_HPP