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