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