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