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