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