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 // suspend/resume lock: used for self-suspend
184 Monitor* _SR_lock;
185
186 protected:
187 enum SuspendFlags {
188 // NOTE: avoid using the sign-bit as cc generates different test code
189 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
190
191 _external_suspend = 0x20000000U, // thread is asked to self suspend
192 _ext_suspended = 0x40000000U, // thread has self-suspended
193 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
194
195 _has_async_exception = 0x00000001U, // there is a pending async exception
196 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
197 };
198
199 // various suspension related flags - atomically updated
200 // overloaded for async exception checking in check_special_condition_for_native_trans.
201 volatile uint32_t _suspend_flags;
202
203 private:
204 int _num_nested_signal;
205
206 public:
207 void enter_signal_handler() { _num_nested_signal++; }
208 void leave_signal_handler() { _num_nested_signal--; }
209 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
210
211 private:
212 // Debug tracing
213 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
214
215 // Active_handles points to a block of handles
216 JNIHandleBlock* _active_handles;
217
218 // One-element thread local free list
219 JNIHandleBlock* _free_handle_block;
220
221 // Point to the last handle mark
222 HandleMark* _last_handle_mark;
223
224 // The parity of the last strong_roots iteration in which this thread was
225 // claimed as a task.
226 jint _oops_do_parity;
227
228 public:
229 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
230 HandleMark* last_handle_mark() const { return _last_handle_mark; }
231 private:
232
233 // debug support for checking if code does allow safepoints or not
234 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
235 // mutex, or blocking on an object synchronizer (Java locking).
236 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
237 // If !allow_allocation(), then an assertion failure will happen during allocation
238 // (Hence, !allow_safepoint() => !allow_allocation()).
239 //
240 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
241 //
242 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
243 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
244
245 // Used by SkipGCALot class.
246 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
247
248 friend class No_Alloc_Verifier;
249 friend class No_Safepoint_Verifier;
250 friend class Pause_No_Safepoint_Verifier;
251 friend class ThreadLocalStorage;
252 friend class GC_locker;
253
254 ThreadLocalAllocBuffer _tlab; // Thread-local eden
255 jlong _allocated_bytes; // Cumulative number of bytes allocated on
256 // the Java heap
257
258 TRACE_DATA _trace_data; // Thread-local data for tracing
259
260 ThreadExt _ext;
261
262 int _vm_operation_started_count; // VM_Operation support
263 int _vm_operation_completed_count; // VM_Operation support
264
265 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
266 // is waiting to lock
267 bool _current_pending_monitor_is_from_java; // locking is from Java code
268
269 // ObjectMonitor on which this thread called Object.wait()
270 ObjectMonitor* _current_waiting_monitor;
271
272 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
273 public:
274 ObjectMonitor* omFreeList;
275 int omFreeCount; // length of omFreeList
276 int omFreeProvision; // reload chunk size
277 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
278 int omInUseCount; // length of omInUseList
279
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 inline void set_suspend_flag(SuspendFlags f);
345 inline void clear_suspend_flag(SuspendFlags f);
346
347 inline void set_has_async_exception();
348 inline void clear_has_async_exception();
349
350 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
351
352 inline void set_critical_native_unlock();
353 inline void clear_critical_native_unlock();
354
355 // Support for Unhandled Oop detection
356 #ifdef CHECK_UNHANDLED_OOPS
357 private:
358 UnhandledOops* _unhandled_oops;
359 public:
360 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
361 // Mark oop safe for gc. It may be stack allocated but won't move.
362 void allow_unhandled_oop(oop *op) {
363 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
364 }
365 // Clear oops at safepoint so crashes point to unhandled oop violator
366 void clear_unhandled_oops() {
367 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
368 }
369 #endif // CHECK_UNHANDLED_OOPS
370
371 #ifndef PRODUCT
372 bool skip_gcalot() { return _skip_gcalot; }
373 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
374 #endif
375
376 public:
377 // Installs a pending exception to be inserted later
378 static void send_async_exception(oop thread_oop, oop java_throwable);
379
380 // Resource area
381 ResourceArea* resource_area() const { return _resource_area; }
382 void set_resource_area(ResourceArea* area) { _resource_area = area; }
383
384 OSThread* osthread() const { return _osthread; }
385 void set_osthread(OSThread* thread) { _osthread = thread; }
386
387 // JNI handle support
388 JNIHandleBlock* active_handles() const { return _active_handles; }
389 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
390 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
391 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
392
393 // Internal handle support
394 HandleArea* handle_area() const { return _handle_area; }
395 void set_handle_area(HandleArea* area) { _handle_area = area; }
396
397 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
398 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
399
400 // Thread-Local Allocation Buffer (TLAB) support
401 ThreadLocalAllocBuffer& tlab() { return _tlab; }
402 void initialize_tlab() {
403 if (UseTLAB) {
404 tlab().initialize();
405 }
406 }
407
408 jlong allocated_bytes() { return _allocated_bytes; }
409 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
410 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
411 inline jlong cooked_allocated_bytes();
412
413 TRACE_DATA* trace_data() { return &_trace_data; }
414
415 const ThreadExt& ext() const { return _ext; }
416 ThreadExt& ext() { return _ext; }
417
418 // VM operation support
419 int vm_operation_ticket() { return ++_vm_operation_started_count; }
420 int vm_operation_completed_count() { return _vm_operation_completed_count; }
421 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
422
423 // For tracking the heavyweight monitor the thread is pending on.
424 ObjectMonitor* current_pending_monitor() {
425 return _current_pending_monitor;
426 }
427 void set_current_pending_monitor(ObjectMonitor* monitor) {
428 _current_pending_monitor = monitor;
429 }
430 void set_current_pending_monitor_is_from_java(bool from_java) {
431 _current_pending_monitor_is_from_java = from_java;
432 }
433 bool current_pending_monitor_is_from_java() {
434 return _current_pending_monitor_is_from_java;
435 }
436
437 // For tracking the ObjectMonitor on which this thread called Object.wait()
438 ObjectMonitor* current_waiting_monitor() {
439 return _current_waiting_monitor;
440 }
441 void set_current_waiting_monitor(ObjectMonitor* monitor) {
442 _current_waiting_monitor = monitor;
443 }
444
445 // GC support
446 // Apply "f->do_oop" to all root oops in "this".
447 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
448 // Used by JavaThread::oops_do.
449 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
450 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
451
452 // Handles the parallel case for the method below.
453 private:
454 bool claim_oops_do_par_case(int collection_parity);
455 public:
456 // Requires that "collection_parity" is that of the current roots
457 // iteration. If "is_par" is false, sets the parity of "this" to
458 // "collection_parity", and returns "true". If "is_par" is true,
459 // uses an atomic instruction to set the current threads parity to
460 // "collection_parity", if it is not already. Returns "true" iff the
461 // calling thread does the update, this indicates that the calling thread
462 // has claimed the thread's stack as a root groop in the current
463 // collection.
464 bool claim_oops_do(bool is_par, int collection_parity) {
465 if (!is_par) {
466 _oops_do_parity = collection_parity;
467 return true;
468 } else {
469 return claim_oops_do_par_case(collection_parity);
470 }
471 }
472
473 // Sweeper support
474 void nmethods_do(CodeBlobClosure* cf);
475
476 // jvmtiRedefineClasses support
477 void metadata_do(void f(Metadata*));
478
479 // Used by fast lock support
480 virtual bool is_lock_owned(address adr) const;
481
482 // Check if address is in the stack of the thread (not just for locks).
483 // Warning: the method can only be used on the running thread
484 bool is_in_stack(address adr) const;
485 // Check if address is in the usable part of the stack (excludes protected
486 // guard pages)
487 bool is_in_usable_stack(address adr) const;
488
489 // Sets this thread as starting thread. Returns failure if thread
490 // creation fails due to lack of memory, too many threads etc.
491 bool set_as_starting_thread();
492
493 protected:
494 // OS data associated with the thread
495 OSThread* _osthread; // Platform-specific thread information
496
497 // Thread local resource area for temporary allocation within the VM
498 ResourceArea* _resource_area;
499
500 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
501
502 // Thread local handle area for allocation of handles within the VM
503 HandleArea* _handle_area;
504 GrowableArray<Metadata*>* _metadata_handles;
505
506 // Support for stack overflow handling, get_thread, etc.
507 address _stack_base;
508 size_t _stack_size;
509 uintptr_t _self_raw_id; // used by get_thread (mutable)
510 int _lgrp_id;
511
512 public:
513 // Stack overflow support
514 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
515
516 void set_stack_base(address base) { _stack_base = base; }
517 size_t stack_size() const { return _stack_size; }
518 void set_stack_size(size_t size) { _stack_size = size; }
519 void record_stack_base_and_size();
520
521 bool on_local_stack(address adr) const {
522 // QQQ this has knowledge of direction, ought to be a stack method
523 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
524 }
525
526 uintptr_t self_raw_id() { return _self_raw_id; }
527 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
528
529 int lgrp_id() const { return _lgrp_id; }
530 void set_lgrp_id(int value) { _lgrp_id = value; }
531
532 // Printing
533 virtual void print_on(outputStream* st) const;
534 void print() const { print_on(tty); }
535 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
536
537 // Debug-only code
538 #ifdef ASSERT
539 private:
540 // Deadlock detection support for Mutex locks. List of locks own by thread.
541 Monitor* _owned_locks;
542 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
543 // thus the friendship
544 friend class Mutex;
545 friend class Monitor;
546
547 public:
548 void print_owned_locks_on(outputStream* st) const;
549 void print_owned_locks() const { print_owned_locks_on(tty); }
550 Monitor* owned_locks() const { return _owned_locks; }
551 bool owns_locks() const { return owned_locks() != NULL; }
552 bool owns_locks_but_compiled_lock() const;
553
554 // Deadlock detection
555 bool allow_allocation() { return _allow_allocation_count == 0; }
556 ResourceMark* current_resource_mark() { return _current_resource_mark; }
557 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
558 #endif
559
560 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
561
562 private:
563 volatile int _jvmti_env_iteration_count;
564
565 public:
566 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
567 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
568 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
569
570 // Code generation
571 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
572 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
573 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
574
575 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
576 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
577
578 #define TLAB_FIELD_OFFSET(name) \
579 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
580
581 TLAB_FIELD_OFFSET(start)
582 TLAB_FIELD_OFFSET(end)
583 TLAB_FIELD_OFFSET(top)
584 TLAB_FIELD_OFFSET(pf_top)
585 TLAB_FIELD_OFFSET(size) // desired_size
586 TLAB_FIELD_OFFSET(refill_waste_limit)
587 TLAB_FIELD_OFFSET(number_of_refills)
588 TLAB_FIELD_OFFSET(fast_refill_waste)
589 TLAB_FIELD_OFFSET(slow_allocations)
590
591 #undef TLAB_FIELD_OFFSET
592
593 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
594
595 public:
596 volatile intptr_t _Stalled;
597 volatile int _TypeTag;
598 ParkEvent * _ParkEvent; // for synchronized()
599 ParkEvent * _SleepEvent; // for Thread.sleep
600 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
601 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
602 int NativeSyncRecursion; // diagnostic
603
604 volatile int _OnTrap; // Resume-at IP delta
605 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
606 jint _hashStateX; // thread-specific hashCode generator state
607 jint _hashStateY;
608 jint _hashStateZ;
609 void * _schedctl;
610
611
612 volatile jint rng[4]; // RNG for spin loop
613
614 // Low-level leaf-lock primitives used to implement synchronization
615 // and native monitor-mutex infrastructure.
616 // Not for general synchronization use.
617 static void SpinAcquire(volatile int * Lock, const char * Name);
618 static void SpinRelease(volatile int * Lock);
619 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
620 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
621 static void muxRelease(volatile intptr_t * Lock);
622 };
623
624 // Inline implementation of Thread::current()
625 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
626 // startup.
627 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
628 // period. This is inlined in thread_<os_family>.inline.hpp.
629
630 inline Thread* Thread::current() {
631 #ifdef ASSERT
632 // This function is very high traffic. Define PARANOID to enable expensive
633 // asserts.
634 #ifdef PARANOID
635 // Signal handler should call ThreadLocalStorage::get_thread_slow()
636 Thread* t = ThreadLocalStorage::get_thread_slow();
637 assert(t != NULL && !t->is_inside_signal_handler(),
638 "Don't use Thread::current() inside signal handler");
639 #endif
640 #endif
641 Thread* thread = ThreadLocalStorage::thread();
642 assert(thread != NULL, "just checking");
643 return thread;
644 }
645
646 // Name support for threads. non-JavaThread subclasses with multiple
647 // uniquely named instances should derive from this.
648 class NamedThread: public Thread {
649 friend class VMStructs;
650 enum {
651 max_name_len = 64
652 };
653 private:
654 char* _name;
655 // log JavaThread being processed by oops_do
656 JavaThread* _processed_thread;
657
658 public:
659 NamedThread();
660 ~NamedThread();
661 // May only be called once per thread.
662 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
663 virtual bool is_Named_thread() const { return true; }
664 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
665 JavaThread *processed_thread() { return _processed_thread; }
666 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
667 virtual void print_on(outputStream* st) const;
668 };
669
670 // Worker threads are named and have an id of an assigned work.
671 class WorkerThread: public NamedThread {
672 private:
673 uint _id;
674 public:
675 WorkerThread() : _id(0) { }
676 virtual bool is_Worker_thread() const { return true; }
677
678 virtual WorkerThread* as_Worker_thread() const {
679 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
680 return (WorkerThread*) this;
681 }
682
683 void set_id(uint work_id) { _id = work_id; }
684 uint id() const { return _id; }
685 };
686
687 // A single WatcherThread is used for simulating timer interrupts.
688 class WatcherThread: public Thread {
689 friend class VMStructs;
690 public:
691 virtual void run();
692
693 private:
694 static WatcherThread* _watcher_thread;
695
696 static bool _startable;
697 volatile static bool _should_terminate; // updated without holding lock
698
699 os::WatcherThreadCrashProtection* _crash_protection;
700 public:
701 enum SomeConstants {
702 delay_interval = 10 // interrupt delay in milliseconds
703 };
704
705 // Constructor
706 WatcherThread();
707
708 // Tester
709 bool is_Watcher_thread() const { return true; }
710
711 // Printing
712 char* name() const { return (char*)"VM Periodic Task Thread"; }
713 void print_on(outputStream* st) const;
714 void unpark();
715
716 // Returns the single instance of WatcherThread
717 static WatcherThread* watcher_thread() { return _watcher_thread; }
718
719 // Create and start the single instance of WatcherThread, or stop it on shutdown
720 static void start();
721 static void stop();
722 // Only allow start once the VM is sufficiently initialized
723 // Otherwise the first task to enroll will trigger the start
724 static void make_startable();
725
726 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
727 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
728 _crash_protection = crash_protection;
729 }
730
731 bool has_crash_protection() const { return _crash_protection != NULL; }
732 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
733
734 private:
735 int sleep() const;
736 };
737
738
739 class CompilerThread;
740
741 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
742
743 class JavaThread: public Thread {
744 friend class VMStructs;
745 private:
746 JavaThread* _next; // The next thread in the Threads list
747 oop _threadObj; // The Java level thread object
748
749 #ifdef ASSERT
750 private:
751 int _java_call_counter;
752
753 public:
754 int java_call_counter() { return _java_call_counter; }
755 void inc_java_call_counter() { _java_call_counter++; }
756 void dec_java_call_counter() {
757 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
758 _java_call_counter--;
759 }
760 private: // restore original namespace restriction
761 #endif // ifdef ASSERT
762
763 #ifndef PRODUCT
764 public:
765 enum {
766 jump_ring_buffer_size = 16
767 };
768 private: // restore original namespace restriction
769 #endif
770
771 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
772
773 ThreadFunction _entry_point;
774
775 JNIEnv _jni_environment;
776
777 // Deopt support
778 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
779
780 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
781 // transition out of native
782 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
783 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
784 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
785 // Because deoptimization is lazy we must save jvmti requests to set locals
786 // in compiled frames until we deoptimize and we have an interpreter frame.
787 // This holds the pointer to array (yeah like there might be more than one) of
788 // description of compiled vframes that have locals that need to be updated.
789 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
790
791 // Handshake value for fixing 6243940. We need a place for the i2c
792 // adapter to store the callee Method*. This value is NEVER live
793 // across a gc point so it does NOT have to be gc'd
794 // The handshake is open ended since we can't be certain that it will
795 // be NULLed. This is because we rarely ever see the race and end up
796 // in handle_wrong_method which is the backend of the handshake. See
797 // code in i2c adapters and handle_wrong_method.
798
799 Method* _callee_target;
800
801 // Used to pass back results to the interpreter or generated code running Java code.
802 oop _vm_result; // oop result is GC-preserved
803 Metadata* _vm_result_2; // non-oop result
804
805 // See ReduceInitialCardMarks: this holds the precise space interval of
806 // the most recent slow path allocation for which compiled code has
807 // elided card-marks for performance along the fast-path.
808 MemRegion _deferred_card_mark;
809
810 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
811 // allocated during deoptimization
812 // and by JNI_MonitorEnter/Exit
813
814 // Async. requests support
815 enum AsyncRequests {
816 _no_async_condition = 0,
817 _async_exception,
818 _async_unsafe_access_error
819 };
820 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
821 oop _pending_async_exception;
822
823 // Safepoint support
824 public: // Expose _thread_state for SafeFetchInt()
825 volatile JavaThreadState _thread_state;
826 private:
827 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
828 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
829
830 // JavaThread termination support
831 enum TerminatedTypes {
832 _not_terminated = 0xDEAD - 2,
833 _thread_exiting, // JavaThread::exit() has been called for this thread
834 _thread_terminated, // JavaThread is removed from thread list
835 _vm_exited // JavaThread is still executing native code, but VM is terminated
836 // only VM_Exit can set _vm_exited
837 };
838
839 // In general a JavaThread's _terminated field transitions as follows:
840 //
841 // _not_terminated => _thread_exiting => _thread_terminated
842 //
843 // _vm_exited is a special value to cover the case of a JavaThread
844 // executing native code after the VM itself is terminated.
845 volatile TerminatedTypes _terminated;
846 // suspend/resume support
847 volatile bool _suspend_equivalent; // Suspend equivalent condition
848 jint _in_deopt_handler; // count of deoptimization
849 // handlers thread is in
850 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
851 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
852 // never locked) when throwing an exception. Used by interpreter only.
853
854 // JNI attach states:
855 enum JNIAttachStates {
856 _not_attaching_via_jni = 1, // thread is not attaching via JNI
857 _attaching_via_jni, // thread is attaching via JNI
858 _attached_via_jni // thread has attached via JNI
859 };
860
861 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
862 // A native thread that is attaching via JNI starts with a value
863 // of _attaching_via_jni and transitions to _attached_via_jni.
864 volatile JNIAttachStates _jni_attach_state;
865
866 public:
867 // State of the stack guard pages for this thread.
868 enum StackGuardState {
869 stack_guard_unused, // not needed
870 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
871 stack_guard_enabled // enabled
872 };
873
874 private:
875
876 StackGuardState _stack_guard_state;
877
878 // Precompute the limit of the stack as used in stack overflow checks.
879 // We load it from here to simplify the stack overflow check in assembly.
880 address _stack_overflow_limit;
881
882 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
883 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
884 // code)
885 volatile oop _exception_oop; // Exception thrown in compiled code
886 volatile address _exception_pc; // PC where exception happened
887 volatile address _exception_handler_pc; // PC for handler of exception
888 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
889
890 // support for JNI critical regions
891 jint _jni_active_critical; // count of entries into JNI critical region
892
893 // Checked JNI: function name requires exception check
894 char* _pending_jni_exception_check_fn;
895
896 // For deadlock detection.
897 int _depth_first_number;
898
899 // JVMTI PopFrame support
900 // This is set to popframe_pending to signal that top Java frame should be popped immediately
901 int _popframe_condition;
902
903 #ifndef PRODUCT
904 int _jmp_ring_index;
905 struct {
906 // We use intptr_t instead of address so debugger doesn't try and display strings
907 intptr_t _target;
908 intptr_t _instruction;
909 const char* _file;
910 int _line;
911 } _jmp_ring[jump_ring_buffer_size];
912 #endif // PRODUCT
913
914 #if INCLUDE_ALL_GCS
915 // Support for G1 barriers
916
917 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
918 // Set of all such queues.
919 static SATBMarkQueueSet _satb_mark_queue_set;
920
921 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
922 // Set of all such queues.
923 static DirtyCardQueueSet _dirty_card_queue_set;
924
925 void flush_barrier_queues();
926 #endif // INCLUDE_ALL_GCS
927
928 friend class VMThread;
929 friend class ThreadWaitTransition;
930 friend class VM_Exit;
931
932 void initialize(); // Initialized the instance variables
933
934 public:
935 // Constructor
936 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
937 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
938 ~JavaThread();
939
940 #ifdef ASSERT
941 // verify this JavaThread hasn't be published in the Threads::list yet
942 void verify_not_published();
943 #endif
944
945 //JNI functiontable getter/setter for JVMTI jni function table interception API.
946 void set_jni_functions(struct JNINativeInterface_* functionTable) {
947 _jni_environment.functions = functionTable;
948 }
949 struct JNINativeInterface_* get_jni_functions() {
950 return (struct JNINativeInterface_ *)_jni_environment.functions;
951 }
952
953 // This function is called at thread creation to allow
954 // platform specific thread variables to be initialized.
955 void cache_global_variables();
956
957 // Executes Shutdown.shutdown()
958 void invoke_shutdown_hooks();
959
960 // Cleanup on thread exit
961 enum ExitType {
962 normal_exit,
963 jni_detach
964 };
965 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
966
967 void cleanup_failed_attach_current_thread();
968
969 // Testers
970 virtual bool is_Java_thread() const { return true; }
971
972 // Thread chain operations
973 JavaThread* next() const { return _next; }
974 void set_next(JavaThread* p) { _next = p; }
975
976 // Thread oop. threadObj() can be NULL for initial JavaThread
977 // (or for threads attached via JNI)
978 oop threadObj() const { return _threadObj; }
979 void set_threadObj(oop p) { _threadObj = p; }
980
981 ThreadPriority java_priority() const; // Read from threadObj()
982
983 // Prepare thread and add to priority queue. If a priority is
984 // not specified, use the priority of the thread object. Threads_lock
985 // must be held while this function is called.
986 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
987 void prepare_ext();
988
989 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
990 address saved_exception_pc() { return _saved_exception_pc; }
991
992
993 ThreadFunction entry_point() const { return _entry_point; }
994
995 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
996 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
997
998 // Last frame anchor routines
999
1000 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1001
1002 // last_Java_sp
1003 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1004 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1005
1006 // last_Java_pc
1007
1008 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1009
1010 // Safepoint support
1011 #ifndef PPC64
1012 JavaThreadState thread_state() const { return _thread_state; }
1013 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1014 #else
1015 // Use membars when accessing volatile _thread_state. See
1016 // Threads::create_vm() for size checks.
1017 inline JavaThreadState thread_state() const;
1018 inline void set_thread_state(JavaThreadState s);
1019 #endif
1020 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1021 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1022 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1023
1024 // thread has called JavaThread::exit() or is terminated
1025 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1026 // thread is terminated (no longer on the threads list); we compare
1027 // against the two non-terminated values so that a freed JavaThread
1028 // will also be considered terminated.
1029 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1030 void set_terminated(TerminatedTypes t) { _terminated = t; }
1031 // special for Threads::remove() which is static:
1032 void set_terminated_value() { _terminated = _thread_terminated; }
1033 void block_if_vm_exited();
1034
1035 bool doing_unsafe_access() { return _doing_unsafe_access; }
1036 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1037
1038 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1039 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1040
1041 // Suspend/resume support for JavaThread
1042 private:
1043 inline void set_ext_suspended();
1044 inline void clear_ext_suspended();
1045
1046 public:
1047 void java_suspend();
1048 void java_resume();
1049 int java_suspend_self();
1050
1051 void check_and_wait_while_suspended() {
1052 assert(JavaThread::current() == this, "sanity check");
1053
1054 bool do_self_suspend;
1055 do {
1056 // were we externally suspended while we were waiting?
1057 do_self_suspend = handle_special_suspend_equivalent_condition();
1058 if (do_self_suspend) {
1059 // don't surprise the thread that suspended us by returning
1060 java_suspend_self();
1061 set_suspend_equivalent();
1062 }
1063 } while (do_self_suspend);
1064 }
1065 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1066 // Check for async exception in addition to safepoint and suspend request.
1067 static void check_special_condition_for_native_trans(JavaThread *thread);
1068
1069 // Same as check_special_condition_for_native_trans but finishes the
1070 // transition into thread_in_Java mode so that it can potentially
1071 // block.
1072 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1073
1074 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1075 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1076 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1077 // Warning: is_ext_suspend_completed() may temporarily drop the
1078 // SR_lock to allow the thread to reach a stable thread state if
1079 // it is currently in a transient thread state.
1080 return is_ext_suspend_completed(false /* !called_by_wait */,
1081 SuspendRetryDelay, bits);
1082 }
1083
1084 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1085 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1086 // passed as the count and delay parameters. Experiments with specific
1087 // calls to wait_for_ext_suspend_completion() can be done by passing
1088 // other values in the code. Experiments with all calls can be done
1089 // via the appropriate -XX options.
1090 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1091
1092 inline void set_external_suspend();
1093 inline void clear_external_suspend();
1094
1095 inline void set_deopt_suspend();
1096 inline void clear_deopt_suspend();
1097 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1098
1099 bool is_external_suspend() const {
1100 return (_suspend_flags & _external_suspend) != 0;
1101 }
1102 // Whenever a thread transitions from native to vm/java it must suspend
1103 // if external|deopt suspend is present.
1104 bool is_suspend_after_native() const {
1105 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1106 }
1107
1108 // external suspend request is completed
1109 bool is_ext_suspended() const {
1110 return (_suspend_flags & _ext_suspended) != 0;
1111 }
1112
1113 bool is_external_suspend_with_lock() const {
1114 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1115 return is_external_suspend();
1116 }
1117
1118 // Special method to handle a pending external suspend request
1119 // when a suspend equivalent condition lifts.
1120 bool handle_special_suspend_equivalent_condition() {
1121 assert(is_suspend_equivalent(),
1122 "should only be called in a suspend equivalence condition");
1123 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1124 bool ret = is_external_suspend();
1125 if (!ret) {
1126 // not about to self-suspend so clear suspend equivalence
1127 clear_suspend_equivalent();
1128 }
1129 // implied else:
1130 // We have a pending external suspend request so we leave the
1131 // suspend_equivalent flag set until java_suspend_self() sets
1132 // the ext_suspended flag and clears the suspend_equivalent
1133 // flag. This insures that wait_for_ext_suspend_completion()
1134 // will return consistent values.
1135 return ret;
1136 }
1137
1138 // utility methods to see if we are doing some kind of suspension
1139 bool is_being_ext_suspended() const {
1140 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1141 return is_ext_suspended() || is_external_suspend();
1142 }
1143
1144 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1145
1146 void set_suspend_equivalent() { _suspend_equivalent = true; }
1147 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1148
1149 // Thread.stop support
1150 void send_thread_stop(oop throwable);
1151 AsyncRequests clear_special_runtime_exit_condition() {
1152 AsyncRequests x = _special_runtime_exit_condition;
1153 _special_runtime_exit_condition = _no_async_condition;
1154 return x;
1155 }
1156
1157 // Are any async conditions present?
1158 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1159
1160 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1161
1162 // these next two are also used for self-suspension and async exception support
1163 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1164
1165 // Return true if JavaThread has an asynchronous condition or
1166 // if external suspension is requested.
1167 bool has_special_runtime_exit_condition() {
1168 // We call is_external_suspend() last since external suspend should
1169 // be less common. Because we don't use is_external_suspend_with_lock
1170 // it is possible that we won't see an asynchronous external suspend
1171 // request that has just gotten started, i.e., SR_lock grabbed but
1172 // _external_suspend field change either not made yet or not visible
1173 // yet. However, this is okay because the request is asynchronous and
1174 // we will see the new flag value the next time through. It's also
1175 // possible that the external suspend request is dropped after
1176 // we have checked is_external_suspend(), we will recheck its value
1177 // under SR_lock in java_suspend_self().
1178 return (_special_runtime_exit_condition != _no_async_condition) ||
1179 is_external_suspend() || is_deopt_suspend();
1180 }
1181
1182 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1183
1184 inline void set_pending_async_exception(oop e);
1185
1186 // Fast-locking support
1187 bool is_lock_owned(address adr) const;
1188
1189 // Accessors for vframe array top
1190 // The linked list of vframe arrays are sorted on sp. This means when we
1191 // unpack the head must contain the vframe array to unpack.
1192 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1193 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1194
1195 // Side structure for deferring update of java frame locals until deopt occurs
1196 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1197 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1198
1199 // These only really exist to make debugging deopt problems simpler
1200
1201 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1202 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1203
1204 // The special resourceMark used during deoptimization
1205
1206 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1207 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1208
1209 intptr_t* must_deopt_id() { return _must_deopt_id; }
1210 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1211 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1212
1213 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1214 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1215
1216 Method* callee_target() const { return _callee_target; }
1217 void set_callee_target (Method* x) { _callee_target = x; }
1218
1219 // Oop results of vm runtime calls
1220 oop vm_result() const { return _vm_result; }
1221 void set_vm_result (oop x) { _vm_result = x; }
1222
1223 Metadata* vm_result_2() const { return _vm_result_2; }
1224 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1225
1226 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1227 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1228
1229 // Exception handling for compiled methods
1230 oop exception_oop() const { return _exception_oop; }
1231 address exception_pc() const { return _exception_pc; }
1232 address exception_handler_pc() const { return _exception_handler_pc; }
1233 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1234
1235 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1236 void set_exception_pc(address a) { _exception_pc = a; }
1237 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1238 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1239
1240 void clear_exception_oop_and_pc() {
1241 set_exception_oop(NULL);
1242 set_exception_pc(NULL);
1243 }
1244
1245 // Stack overflow support
1246 inline size_t stack_available(address cur_sp);
1247 address stack_yellow_zone_base() {
1248 return (address)(stack_base() -
1249 (stack_size() -
1250 (stack_red_zone_size() + stack_yellow_zone_size())));
1251 }
1252 size_t stack_yellow_zone_size() {
1253 return StackYellowPages * os::vm_page_size();
1254 }
1255 address stack_red_zone_base() {
1256 return (address)(stack_base() - (stack_size() - stack_red_zone_size()));
1257 }
1258 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); }
1259 bool in_stack_yellow_zone(address a) {
1260 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base());
1261 }
1262 bool in_stack_red_zone(address a) {
1263 return (a <= stack_red_zone_base()) &&
1264 (a >= (address)((intptr_t)stack_base() - stack_size()));
1265 }
1266
1267 void create_stack_guard_pages();
1268 void remove_stack_guard_pages();
1269
1270 void enable_stack_yellow_zone();
1271 void disable_stack_yellow_zone();
1272 void enable_stack_red_zone();
1273 void disable_stack_red_zone();
1274
1275 inline bool stack_guard_zone_unused();
1276 inline bool stack_yellow_zone_disabled();
1277 inline bool stack_yellow_zone_enabled();
1278
1279 // Attempt to reguard the stack after a stack overflow may have occurred.
1280 // Returns true if (a) guard pages are not needed on this thread, (b) the
1281 // pages are already guarded, or (c) the pages were successfully reguarded.
1282 // Returns false if there is not enough stack space to reguard the pages, in
1283 // which case the caller should unwind a frame and try again. The argument
1284 // should be the caller's (approximate) sp.
1285 bool reguard_stack(address cur_sp);
1286 // Similar to above but see if current stackpoint is out of the guard area
1287 // and reguard if possible.
1288 bool reguard_stack(void);
1289
1290 address stack_overflow_limit() { return _stack_overflow_limit; }
1291 void set_stack_overflow_limit() {
1292 _stack_overflow_limit = _stack_base - _stack_size +
1293 ((StackShadowPages +
1294 StackYellowPages +
1295 StackRedPages) * os::vm_page_size());
1296 }
1297
1298 // Misc. accessors/mutators
1299 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1300 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1301 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1302
1303 #ifndef PRODUCT
1304 void record_jump(address target, address instr, const char* file, int line);
1305 #endif // PRODUCT
1306
1307 // For assembly stub generation
1308 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1309 #ifndef PRODUCT
1310 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1311 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1312 #endif // PRODUCT
1313 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1314 static ByteSize last_Java_sp_offset() {
1315 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1316 }
1317 static ByteSize last_Java_pc_offset() {
1318 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1319 }
1320 static ByteSize frame_anchor_offset() {
1321 return byte_offset_of(JavaThread, _anchor);
1322 }
1323 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1324 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1325 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1326 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1327 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1328 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1329 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1330 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1331 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1332 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1333 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1334 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1335 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1336
1337 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1338 static ByteSize should_post_on_exceptions_flag_offset() {
1339 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1340 }
1341
1342 #if INCLUDE_ALL_GCS
1343 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1344 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1345 #endif // INCLUDE_ALL_GCS
1346
1347 // Returns the jni environment for this thread
1348 JNIEnv* jni_environment() { return &_jni_environment; }
1349
1350 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1351 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1352 // Only return NULL if thread is off the thread list; starting to
1353 // exit should not return NULL.
1354 if (thread_from_jni_env->is_terminated()) {
1355 thread_from_jni_env->block_if_vm_exited();
1356 return NULL;
1357 } else {
1358 return thread_from_jni_env;
1359 }
1360 }
1361
1362 // JNI critical regions. These can nest.
1363 bool in_critical() { return _jni_active_critical > 0; }
1364 bool in_last_critical() { return _jni_active_critical == 1; }
1365 void enter_critical() {
1366 assert(Thread::current() == this ||
1367 (Thread::current()->is_VM_thread() &&
1368 SafepointSynchronize::is_synchronizing()),
1369 "this must be current thread or synchronizing");
1370 _jni_active_critical++;
1371 }
1372 void exit_critical() {
1373 assert(Thread::current() == this, "this must be current thread");
1374 _jni_active_critical--;
1375 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1376 }
1377
1378 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1379 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1380 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1381 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1382 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1383
1384 // For deadlock detection
1385 int depth_first_number() { return _depth_first_number; }
1386 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1387
1388 private:
1389 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1390
1391 public:
1392 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1393 void add_monitor_chunk(MonitorChunk* chunk);
1394 void remove_monitor_chunk(MonitorChunk* chunk);
1395 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1396 void inc_in_deopt_handler() { _in_deopt_handler++; }
1397 void dec_in_deopt_handler() {
1398 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1399 if (_in_deopt_handler > 0) { // robustness
1400 _in_deopt_handler--;
1401 }
1402 }
1403
1404 private:
1405 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1406
1407 public:
1408
1409 // Frame iteration; calls the function f for all frames on the stack
1410 void frames_do(void f(frame*, const RegisterMap*));
1411
1412 // Memory operations
1413 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1414
1415 // Sweeper operations
1416 void nmethods_do(CodeBlobClosure* cf);
1417
1418 // RedefineClasses Support
1419 void metadata_do(void f(Metadata*));
1420
1421 // Misc. operations
1422 char* name() const { return (char*)get_thread_name(); }
1423 void print_on(outputStream* st) const;
1424 void print_value();
1425 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1426 void print_thread_state() const PRODUCT_RETURN;
1427 void print_on_error(outputStream* st, char* buf, int buflen) const;
1428 void verify();
1429 const char* get_thread_name() const;
1430 private:
1431 // factor out low-level mechanics for use in both normal and error cases
1432 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1433 public:
1434 const char* get_threadgroup_name() const;
1435 const char* get_parent_name() const;
1436
1437 // Accessing frames
1438 frame last_frame() {
1439 _anchor.make_walkable(this);
1440 return pd_last_frame();
1441 }
1442 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1443
1444 // Returns method at 'depth' java or native frames down the stack
1445 // Used for security checks
1446 Klass* security_get_caller_class(int depth);
1447
1448 // Print stack trace in external format
1449 void print_stack_on(outputStream* st);
1450 void print_stack() { print_stack_on(tty); }
1451
1452 // Print stack traces in various internal formats
1453 void trace_stack() PRODUCT_RETURN;
1454 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1455 void trace_frames() PRODUCT_RETURN;
1456 void trace_oops() PRODUCT_RETURN;
1457
1458 // Print an annotated view of the stack frames
1459 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1460 void validate_frame_layout() {
1461 print_frame_layout(0, true);
1462 }
1463
1464 // Returns the number of stack frames on the stack
1465 int depth() const;
1466
1467 // Function for testing deoptimization
1468 void deoptimize();
1469 void make_zombies();
1470
1471 void deoptimized_wrt_marked_nmethods();
1472
1473 // Profiling operation (see fprofile.cpp)
1474 public:
1475 bool profile_last_Java_frame(frame* fr);
1476
1477 private:
1478 ThreadProfiler* _thread_profiler;
1479 private:
1480 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1481 friend class FlatProfilerTask; // uses get_thread_profiler.
1482 friend class ThreadProfilerMark; // uses get_thread_profiler.
1483 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1484 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1485 ThreadProfiler* result = _thread_profiler;
1486 _thread_profiler = tp;
1487 return result;
1488 }
1489
1490 public:
1491 // Returns the running thread as a JavaThread
1492 static inline JavaThread* current();
1493
1494 // Returns the active Java thread. Do not use this if you know you are calling
1495 // from a JavaThread, as it's slower than JavaThread::current. If called from
1496 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1497 // operation. You may not want that either.
1498 static JavaThread* active();
1499
1500 inline CompilerThread* as_CompilerThread();
1501
1502 public:
1503 virtual void run();
1504 void thread_main_inner();
1505
1506 private:
1507 // PRIVILEGED STACK
1508 PrivilegedElement* _privileged_stack_top;
1509 GrowableArray<oop>* _array_for_gc;
1510 public:
1511
1512 // Returns the privileged_stack information.
1513 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1514 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1515 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1516
1517 public:
1518 // Thread local information maintained by JVMTI.
1519 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1520 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1521 // getter is used to get this JavaThread's JvmtiThreadState if it has
1522 // one which means NULL can be returned. JvmtiThreadState::state_for()
1523 // is used to get the specified JavaThread's JvmtiThreadState if it has
1524 // one or it allocates a new JvmtiThreadState for the JavaThread and
1525 // returns it. JvmtiThreadState::state_for() will return NULL only if
1526 // the specified JavaThread is exiting.
1527 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1528 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1529 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1530 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1531
1532 // JVMTI PopFrame support
1533 // Setting and clearing popframe_condition
1534 // All of these enumerated values are bits. popframe_pending
1535 // indicates that a PopFrame() has been requested and not yet been
1536 // completed. popframe_processing indicates that that PopFrame() is in
1537 // the process of being completed. popframe_force_deopt_reexecution_bit
1538 // indicates that special handling is required when returning to a
1539 // deoptimized caller.
1540 enum PopCondition {
1541 popframe_inactive = 0x00,
1542 popframe_pending_bit = 0x01,
1543 popframe_processing_bit = 0x02,
1544 popframe_force_deopt_reexecution_bit = 0x04
1545 };
1546 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1547 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1548 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1549 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1550 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1551 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1552 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1553 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1554 #ifdef CC_INTERP
1555 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1556 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1557 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1558 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1559 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1560 #endif
1561
1562 private:
1563 // Saved incoming arguments to popped frame.
1564 // Used only when popped interpreted frame returns to deoptimized frame.
1565 void* _popframe_preserved_args;
1566 int _popframe_preserved_args_size;
1567
1568 public:
1569 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1570 void* popframe_preserved_args();
1571 ByteSize popframe_preserved_args_size();
1572 WordSize popframe_preserved_args_size_in_words();
1573 void popframe_free_preserved_args();
1574
1575
1576 private:
1577 JvmtiThreadState *_jvmti_thread_state;
1578 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1579
1580 // Used by the interpreter in fullspeed mode for frame pop, method
1581 // entry, method exit and single stepping support. This field is
1582 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1583 // It can be set to zero asynchronously (i.e., without a VM operation
1584 // or a lock) so we have to be very careful.
1585 int _interp_only_mode;
1586
1587 public:
1588 // used by the interpreter for fullspeed debugging support (see above)
1589 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1590 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1591 int get_interp_only_mode() { return _interp_only_mode; }
1592 void increment_interp_only_mode() { ++_interp_only_mode; }
1593 void decrement_interp_only_mode() { --_interp_only_mode; }
1594
1595 // support for cached flag that indicates whether exceptions need to be posted for this thread
1596 // if this is false, we can avoid deoptimizing when events are thrown
1597 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1598 private:
1599 int _should_post_on_exceptions_flag;
1600
1601 public:
1602 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1603 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1604
1605 private:
1606 ThreadStatistics *_thread_stat;
1607
1608 public:
1609 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1610
1611 // Return a blocker object for which this thread is blocked parking.
1612 oop current_park_blocker();
1613
1614 private:
1615 static size_t _stack_size_at_create;
1616
1617 public:
1618 static inline size_t stack_size_at_create(void) {
1619 return _stack_size_at_create;
1620 }
1621 static inline void set_stack_size_at_create(size_t value) {
1622 _stack_size_at_create = value;
1623 }
1624
1625 #if INCLUDE_ALL_GCS
1626 // SATB marking queue support
1627 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1628 static SATBMarkQueueSet& satb_mark_queue_set() {
1629 return _satb_mark_queue_set;
1630 }
1631
1632 // Dirty card queue support
1633 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1634 static DirtyCardQueueSet& dirty_card_queue_set() {
1635 return _dirty_card_queue_set;
1636 }
1637 #endif // INCLUDE_ALL_GCS
1638
1639 // This method initializes the SATB and dirty card queues before a
1640 // JavaThread is added to the Java thread list. Right now, we don't
1641 // have to do anything to the dirty card queue (it should have been
1642 // activated when the thread was created), but we have to activate
1643 // the SATB queue if the thread is created while a marking cycle is
1644 // in progress. The activation / de-activation of the SATB queues at
1645 // the beginning / end of a marking cycle is done during safepoints
1646 // so we have to make sure this method is called outside one to be
1647 // able to safely read the active field of the SATB queue set. Right
1648 // now, it is called just before the thread is added to the Java
1649 // thread list in the Threads::add() method. That method is holding
1650 // the Threads_lock which ensures we are outside a safepoint. We
1651 // cannot do the obvious and set the active field of the SATB queue
1652 // when the thread is created given that, in some cases, safepoints
1653 // might happen between the JavaThread constructor being called and the
1654 // thread being added to the Java thread list (an example of this is
1655 // when the structure for the DestroyJavaVM thread is created).
1656 #if INCLUDE_ALL_GCS
1657 void initialize_queues();
1658 #else // INCLUDE_ALL_GCS
1659 void initialize_queues() { }
1660 #endif // INCLUDE_ALL_GCS
1661
1662 // Machine dependent stuff
1663 #ifdef TARGET_OS_ARCH_linux_x86
1664 # include "thread_linux_x86.hpp"
1665 #endif
1666 #ifdef TARGET_OS_ARCH_linux_sparc
1667 # include "thread_linux_sparc.hpp"
1668 #endif
1669 #ifdef TARGET_OS_ARCH_linux_zero
1670 # include "thread_linux_zero.hpp"
1671 #endif
1672 #ifdef TARGET_OS_ARCH_solaris_x86
1673 # include "thread_solaris_x86.hpp"
1674 #endif
1675 #ifdef TARGET_OS_ARCH_solaris_sparc
1676 # include "thread_solaris_sparc.hpp"
1677 #endif
1678 #ifdef TARGET_OS_ARCH_windows_x86
1679 # include "thread_windows_x86.hpp"
1680 #endif
1681 #ifdef TARGET_OS_ARCH_linux_arm
1682 # include "thread_linux_arm.hpp"
1683 #endif
1684 #ifdef TARGET_OS_ARCH_linux_ppc
1685 # include "thread_linux_ppc.hpp"
1686 #endif
1687 #ifdef TARGET_OS_ARCH_aix_ppc
1688 # include "thread_aix_ppc.hpp"
1689 #endif
1690 #ifdef TARGET_OS_ARCH_bsd_x86
1691 # include "thread_bsd_x86.hpp"
1692 #endif
1693 #ifdef TARGET_OS_ARCH_bsd_zero
1694 # include "thread_bsd_zero.hpp"
1695 #endif
1696
1697
1698 public:
1699 void set_blocked_on_compilation(bool value) {
1700 _blocked_on_compilation = value;
1701 }
1702
1703 bool blocked_on_compilation() {
1704 return _blocked_on_compilation;
1705 }
1706 protected:
1707 bool _blocked_on_compilation;
1708
1709
1710 // JSR166 per-thread parker
1711 private:
1712 Parker* _parker;
1713 public:
1714 Parker* parker() { return _parker; }
1715
1716 // Biased locking support
1717 private:
1718 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1719 public:
1720 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1721 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1722
1723 // clearing/querying jni attach status
1724 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1725 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1726 inline void set_done_attaching_via_jni();
1727 private:
1728 // This field is used to determine if a thread has claimed
1729 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1730 // otherwise its value is the par_id that has been claimed.
1731 uint _claimed_par_id;
1732 public:
1733 uint get_claimed_par_id() { return _claimed_par_id; }
1734 void set_claimed_par_id(uint id) { _claimed_par_id = id; }
1735 };
1736
1737 // Inline implementation of JavaThread::current
1738 inline JavaThread* JavaThread::current() {
1739 Thread* thread = ThreadLocalStorage::thread();
1740 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1741 return (JavaThread*)thread;
1742 }
1743
1744 inline CompilerThread* JavaThread::as_CompilerThread() {
1745 assert(is_Compiler_thread(), "just checking");
1746 return (CompilerThread*)this;
1747 }
1748
1749 // A thread used for Compilation.
1750 class CompilerThread : public JavaThread {
1751 friend class VMStructs;
1752 private:
1753 CompilerCounters* _counters;
1754
1755 ciEnv* _env;
1756 CompileLog* _log;
1757 CompileTask* _task;
1758 CompileQueue* _queue;
1759 BufferBlob* _buffer_blob;
1760
1761 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1762 AbstractCompiler* _compiler;
1763
1764 public:
1765
1766 static CompilerThread* current();
1767
1768 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1769
1770 bool is_Compiler_thread() const { return true; }
1771 // Hide this compiler thread from external view.
1772 bool is_hidden_from_external_view() const { return true; }
1773
1774 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1775 AbstractCompiler* compiler() const { return _compiler; }
1776
1777 CompileQueue* queue() const { return _queue; }
1778 CompilerCounters* counters() const { return _counters; }
1779
1780 // Get/set the thread's compilation environment.
1781 ciEnv* env() { return _env; }
1782 void set_env(ciEnv* env) { _env = env; }
1783
1784 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1785 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
1786
1787 // Get/set the thread's logging information
1788 CompileLog* log() { return _log; }
1789 void init_log(CompileLog* log) {
1790 // Set once, for good.
1791 assert(_log == NULL, "set only once");
1792 _log = log;
1793 }
1794
1795 // GC support
1796 // Apply "f->do_oop" to all root oops in "this".
1797 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1798 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1799
1800 #ifndef PRODUCT
1801 private:
1802 IdealGraphPrinter *_ideal_graph_printer;
1803 public:
1804 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1805 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1806 #endif
1807
1808 // Get/set the thread's current task
1809 CompileTask* task() { return _task; }
1810 void set_task(CompileTask* task) { _task = task; }
1811
1812 // Track the nmethod currently being scanned by the sweeper
1813 void set_scanned_nmethod(nmethod* nm) {
1814 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1815 _scanned_nmethod = nm;
1816 }
1817 };
1818
1819 inline CompilerThread* CompilerThread::current() {
1820 return JavaThread::current()->as_CompilerThread();
1821 }
1822
1823 // The active thread queue. It also keeps track of the current used
1824 // thread priorities.
1825 class Threads: AllStatic {
1826 friend class VMStructs;
1827 private:
1828 static JavaThread* _thread_list;
1829 static int _number_of_threads;
1830 static int _number_of_non_daemon_threads;
1831 static int _return_code;
1832 #ifdef ASSERT
1833 static bool _vm_complete;
1834 #endif
1835
1836 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
1837 static void initialize_jsr292_core_classes(TRAPS);
1838 public:
1839 // Thread management
1840 // force_daemon is a concession to JNI, where we may need to add a
1841 // thread to the thread list before allocating its thread object
1842 static void add(JavaThread* p, bool force_daemon = false);
1843 static void remove(JavaThread* p);
1844 static bool includes(JavaThread* p);
1845 static JavaThread* first() { return _thread_list; }
1846 static void threads_do(ThreadClosure* tc);
1847
1848 // Initializes the vm and creates the vm thread
1849 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1850 static void convert_vm_init_libraries_to_agents();
1851 static void create_vm_init_libraries();
1852 static void create_vm_init_agents();
1853 static void shutdown_vm_agents();
1854 static bool destroy_vm();
1855 // Supported VM versions via JNI
1856 // Includes JNI_VERSION_1_1
1857 static jboolean is_supported_jni_version_including_1_1(jint version);
1858 // Does not include JNI_VERSION_1_1
1859 static jboolean is_supported_jni_version(jint version);
1860
1861 // Garbage collection
1862 static void follow_other_roots(void f(oop*));
1863
1864 // Apply "f->do_oop" to all root oops in all threads.
1865 // This version may only be called by sequential code.
1866 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1867 // This version may be called by sequential or parallel code.
1868 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1869 // This creates a list of GCTasks, one per thread.
1870 static void create_thread_roots_tasks(GCTaskQueue* q);
1871 // This creates a list of GCTasks, one per thread, for marking objects.
1872 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1873
1874 // Apply "f->do_oop" to roots in all threads that
1875 // are part of compiled frames
1876 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1877
1878 static void convert_hcode_pointers();
1879 static void restore_hcode_pointers();
1880
1881 // Sweeper
1882 static void nmethods_do(CodeBlobClosure* cf);
1883
1884 // RedefineClasses support
1885 static void metadata_do(void f(Metadata*));
1886
1887 #ifdef ASSERT
1888 static bool is_vm_complete() { return _vm_complete; }
1889 #endif
1890
1891 // Verification
1892 static void verify();
1893 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1894 static void print(bool print_stacks, bool internal_format) {
1895 // this function is only used by debug.cpp
1896 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1897 }
1898 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1899
1900 // Get Java threads that are waiting to enter a monitor. If doLock
1901 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1902 // VM needs to be at a safepoint.
1903 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1904 address monitor, bool doLock);
1905
1906 // Get owning Java thread from the monitor's owner field. If doLock
1907 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1908 // VM needs to be at a safepoint.
1909 static JavaThread *owning_thread_from_monitor_owner(address owner,
1910 bool doLock);
1911
1912 // Number of threads on the active threads list
1913 static int number_of_threads() { return _number_of_threads; }
1914 // Number of non-daemon threads on the active threads list
1915 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1916
1917 // Deoptimizes all frames tied to marked nmethods
1918 static void deoptimized_wrt_marked_nmethods();
1919
1920 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
1921
1922 };
1923
1924
1925 // Thread iterator
1926 class ThreadClosure: public StackObj {
1927 public:
1928 virtual void do_thread(Thread* thread) = 0;
1929 };
1930
1931 class SignalHandlerMark: public StackObj {
1932 private:
1933 Thread* _thread;
1934 public:
1935 SignalHandlerMark(Thread* t) {
1936 _thread = t;
1937 if (_thread) _thread->enter_signal_handler();
1938 }
1939 ~SignalHandlerMark() {
1940 if (_thread) _thread->leave_signal_handler();
1941 _thread = NULL;
1942 }
1943 };
1944
1945
1946 #endif // SHARE_VM_RUNTIME_THREAD_HPP