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