1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 #define SHARE_VM_RUNTIME_THREAD_HPP
27
28 #include "memory/allocation.hpp"
29 #include "memory/threadLocalAllocBuffer.hpp"
30 #include "oops/oop.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvmtiExport.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/javaFrameAnchor.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/mutexLocker.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/osThread.hpp"
39 #include "runtime/park.hpp"
40 #include "runtime/safepoint.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "runtime/threadLocalStorage.hpp"
43 #include "runtime/thread_ext.hpp"
44 #include "runtime/unhandledOops.hpp"
45 #include "trace/traceBackend.hpp"
46 #include "trace/traceMacros.hpp"
47 #include "utilities/exceptions.hpp"
48 #include "utilities/macros.hpp"
49 #include "utilities/top.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/g1/dirtyCardQueue.hpp"
52 #include "gc_implementation/g1/satbQueue.hpp"
53 #endif // INCLUDE_ALL_GCS
54 #ifdef ZERO
55 #ifdef TARGET_ARCH_zero
56 # include "stack_zero.hpp"
57 #endif
58 #endif
59
60 class ThreadSafepointState;
61 class ThreadProfiler;
62
63 class JvmtiThreadState;
64 class JvmtiGetLoadedClassesClosure;
65 class ThreadStatistics;
66 class ConcurrentLocksDump;
67 class ParkEvent;
68 class Parker;
69
70 class ciEnv;
71 class CompileThread;
72 class CompileLog;
73 class CompileTask;
74 class CompileQueue;
75 class CompilerCounters;
76 class vframeArray;
77
78 class DeoptResourceMark;
79 class jvmtiDeferredLocalVariableSet;
80
81 class GCTaskQueue;
82 class ThreadClosure;
83 class IdealGraphPrinter;
84
85 class Metadata;
86 template <class T, MEMFLAGS F> class ChunkedList;
87 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
88
89 DEBUG_ONLY(class ResourceMark;)
90
91 class TraceBuffer;
92 class CachedTraceStack;
93
94 class WorkerThread;
95
96 // Class hierarchy
97 // - Thread
98 // - NamedThread
99 // - VMThread
100 // - ConcurrentGCThread
101 // - WorkerThread
102 // - GangWorker
103 // - GCTaskThread
104 // - JavaThread
105 // - WatcherThread
106
107 class Thread: public ThreadShadow {
108 friend class VMStructs;
109 private:
110 // Exception handling
111 // (Note: _pending_exception and friends are in ThreadShadow)
112 //oop _pending_exception; // pending exception for current thread
113 // const char* _exception_file; // file information for exception (debugging only)
114 // int _exception_line; // line information for exception (debugging only)
115 protected:
116 // Support for forcing alignment of thread objects for biased locking
117 void* _real_malloc_address;
118 public:
119 void* operator new(size_t size) throw() { return allocate(size, true); }
120 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
121 return allocate(size, false); }
122 void operator delete(void* p);
123
124 protected:
125 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
126 private:
127
128 // ***************************************************************
129 // Suspend and resume support
130 // ***************************************************************
131 //
132 // VM suspend/resume no longer exists - it was once used for various
133 // things including safepoints but was deprecated and finally removed
134 // in Java 7. Because VM suspension was considered "internal" Java-level
135 // suspension was considered "external", and this legacy naming scheme
136 // remains.
137 //
138 // External suspend/resume requests come from JVM_SuspendThread,
139 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
140 // ResumeThread. External
141 // suspend requests cause _external_suspend to be set and external
142 // resume requests cause _external_suspend to be cleared.
143 // External suspend requests do not nest on top of other external
144 // suspend requests. The higher level APIs reject suspend requests
145 // for already suspended threads.
146 //
147 // The external_suspend
148 // flag is checked by has_special_runtime_exit_condition() and java thread
149 // will self-suspend when handle_special_runtime_exit_condition() is
150 // called. Most uses of the _thread_blocked state in JavaThreads are
151 // considered the same as being externally suspended; if the blocking
152 // condition lifts, the JavaThread will self-suspend. Other places
153 // where VM checks for external_suspend include:
154 // + mutex granting (do not enter monitors when thread is suspended)
155 // + state transitions from _thread_in_native
156 //
157 // In general, java_suspend() does not wait for an external suspend
158 // request to complete. When it returns, the only guarantee is that
159 // the _external_suspend field is true.
160 //
161 // wait_for_ext_suspend_completion() is used to wait for an external
162 // suspend request to complete. External suspend requests are usually
163 // followed by some other interface call that requires the thread to
164 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
165 // the interface that requires quiescence, we give the JavaThread a
166 // chance to self-suspend before we need it to be quiescent. This
167 // improves overall suspend/query performance.
168 //
169 // _suspend_flags controls the behavior of java_ suspend/resume.
170 // It must be set under the protection of SR_lock. Read from the flag is
171 // OK without SR_lock as long as the value is only used as a hint.
172 // (e.g., check _external_suspend first without lock and then recheck
173 // inside SR_lock and finish the suspension)
174 //
175 // _suspend_flags is also overloaded for other "special conditions" so
176 // that a single check indicates whether any special action is needed
177 // eg. for async exceptions.
178 // -------------------------------------------------------------------
179 // Notes:
180 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
181 // but we still update its value to keep other part of the system (mainly
182 // JVMTI) happy. ThreadState is legacy code (see notes in
183 // osThread.hpp).
184 //
185 // 2. It would be more natural if set_external_suspend() is private and
186 // part of java_suspend(), but that probably would affect the suspend/query
187 // performance. Need more investigation on this.
188 //
189
190 // suspend/resume lock: used for self-suspend
191 Monitor* _SR_lock;
192
193 protected:
194 enum SuspendFlags {
195 // NOTE: avoid using the sign-bit as cc generates different test code
196 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
197
198 _external_suspend = 0x20000000U, // thread is asked to self suspend
199 _ext_suspended = 0x40000000U, // thread has self-suspended
200 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
201
202 _has_async_exception = 0x00000001U, // there is a pending async exception
203 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
204 };
205
206 // various suspension related flags - atomically updated
207 // overloaded for async exception checking in check_special_condition_for_native_trans.
208 volatile uint32_t _suspend_flags;
209
210 private:
211 int _num_nested_signal;
212
213 public:
214 void enter_signal_handler() { _num_nested_signal++; }
215 void leave_signal_handler() { _num_nested_signal--; }
216 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
217
218 private:
219 // Debug tracing
220 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
221
222 // Active_handles points to a block of handles
223 JNIHandleBlock* _active_handles;
224
225 // One-element thread local free list
226 JNIHandleBlock* _free_handle_block;
227
228 // Point to the last handle mark
229 HandleMark* _last_handle_mark;
230
231 // The parity of the last strong_roots iteration in which this thread was
232 // claimed as a task.
233 jint _oops_do_parity;
234
235 public:
236 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
237 HandleMark* last_handle_mark() const { return _last_handle_mark; }
238 private:
239
240 // debug support for checking if code does allow safepoints or not
241 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
242 // mutex, or blocking on an object synchronizer (Java locking).
243 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
244 // If !allow_allocation(), then an assertion failure will happen during allocation
245 // (Hence, !allow_safepoint() => !allow_allocation()).
246 //
247 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
248 //
249 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
250 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
251
252 // Used by SkipGCALot class.
253 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
254
255 friend class No_Alloc_Verifier;
256 friend class No_Safepoint_Verifier;
257 friend class Pause_No_Safepoint_Verifier;
258 friend class ThreadLocalStorage;
259 friend class GC_locker;
260
261 ThreadLocalAllocBuffer _tlab; // Thread-local eden
262 jlong _allocated_bytes; // Cumulative number of bytes allocated on
263 // the Java heap
264
265 // Thread-local buffer used by MetadataOnStackMark.
266 MetadataOnStackBuffer* _metadata_on_stack_buffer;
267
268 TraceBuffer *_trace_buffer;
269 debug_only(bool _trace_active;)
270 intptr_t _park_last_global_seq;
271 int _park_priority;
272 int _nesting_level;
273 address _memento_original_return_address;
274 const CachedTraceStack* _memento_stack_trace;
275
276 TRACE_DATA _trace_data; // Thread-local data for tracing
277
278 ThreadExt _ext;
279
280 int _vm_operation_started_count; // VM_Operation support
281 int _vm_operation_completed_count; // VM_Operation support
282
283 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
284 // is waiting to lock
285 bool _current_pending_monitor_is_from_java; // locking is from Java code
286
287 // ObjectMonitor on which this thread called Object.wait()
288 ObjectMonitor* _current_waiting_monitor;
289
290 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
291 public:
292 ObjectMonitor* omFreeList;
293 int omFreeCount; // length of omFreeList
294 int omFreeProvision; // reload chunk size
295 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
296 int omInUseCount; // length of omInUseList
297
298 #ifdef ASSERT
299 private:
300 bool _visited_for_critical_count;
301
302 public:
303 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
304 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
305 #endif
306
307 public:
308 enum {
309 is_definitely_current_thread = true
310 };
311
312 // Constructor
313 Thread();
314 virtual ~Thread();
315
316 // initializtion
317 void initialize_thread_local_storage();
318
319 // thread entry point
320 virtual void run();
321
322 // Testers
323 virtual bool is_VM_thread() const { return false; }
324 virtual bool is_Java_thread() const { return false; }
325 virtual bool is_Compiler_thread() const { return false; }
326 virtual bool is_TraceReader_thread() const { return false; }
327 virtual bool is_hidden_from_external_view() const { return false; }
328 virtual bool is_jvmti_agent_thread() const { return false; }
329 // True iff the thread can perform GC operations at a safepoint.
330 // Generally will be true only of VM thread and parallel GC WorkGang
331 // threads.
332 virtual bool is_GC_task_thread() const { return false; }
333 virtual bool is_Watcher_thread() const { return false; }
334 virtual bool is_ConcurrentGC_thread() const { return false; }
335 virtual bool is_Named_thread() const { return false; }
336 virtual bool is_Worker_thread() const { return false; }
337
338 // Casts
339 virtual WorkerThread* as_Worker_thread() const { return NULL; }
340
341 virtual char* name() const { return (char*)"Unknown thread"; }
342
343 // Returns the current thread
344 static inline Thread* current();
345
346 // Common thread operations
347 static void set_priority(Thread* thread, ThreadPriority priority);
348 static ThreadPriority get_priority(const Thread* const thread);
349 static void start(Thread* thread);
350 static void interrupt(Thread* thr);
351 static bool is_interrupted(Thread* thr, bool clear_interrupted);
352
353 void set_native_thread_name(const char *name) {
354 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
355 os::set_native_thread_name(name);
356 }
357
358 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
359 Monitor* SR_lock() const { return _SR_lock; }
360
361 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
362
363 void set_suspend_flag(SuspendFlags f) {
364 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
365 uint32_t flags;
366 do {
367 flags = _suspend_flags;
368 }
369 while (Atomic::cmpxchg((jint)(flags | f),
370 (volatile jint*)&_suspend_flags,
371 (jint)flags) != (jint)flags);
372 }
373 void clear_suspend_flag(SuspendFlags f) {
374 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
375 uint32_t flags;
376 do {
377 flags = _suspend_flags;
378 }
379 while (Atomic::cmpxchg((jint)(flags & ~f),
380 (volatile jint*)&_suspend_flags,
381 (jint)flags) != (jint)flags);
382 }
383
384 void set_has_async_exception() {
385 set_suspend_flag(_has_async_exception);
386 }
387 void clear_has_async_exception() {
388 clear_suspend_flag(_has_async_exception);
389 }
390
391 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
392
393 void set_critical_native_unlock() {
394 set_suspend_flag(_critical_native_unlock);
395 }
396 void clear_critical_native_unlock() {
397 clear_suspend_flag(_critical_native_unlock);
398 }
399
400 // Support for Unhandled Oop detection
401 #ifdef CHECK_UNHANDLED_OOPS
402 private:
403 UnhandledOops* _unhandled_oops;
404 public:
405 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
406 // Mark oop safe for gc. It may be stack allocated but won't move.
407 void allow_unhandled_oop(oop *op) {
408 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
409 }
410 // Clear oops at safepoint so crashes point to unhandled oop violator
411 void clear_unhandled_oops() {
412 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
413 }
414 #endif // CHECK_UNHANDLED_OOPS
415
416 #ifndef PRODUCT
417 bool skip_gcalot() { return _skip_gcalot; }
418 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
419 #endif
420
421 public:
422 // Installs a pending exception to be inserted later
423 static void send_async_exception(oop thread_oop, oop java_throwable);
424
425 // Resource area
426 ResourceArea* resource_area() const { return _resource_area; }
427 void set_resource_area(ResourceArea* area) { _resource_area = area; }
428
429 OSThread* osthread() const { return _osthread; }
430 void set_osthread(OSThread* thread) { _osthread = thread; }
431
432 // JNI handle support
433 JNIHandleBlock* active_handles() const { return _active_handles; }
434 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
435 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
436 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
437
438 // Internal handle support
439 HandleArea* handle_area() const { return _handle_area; }
440 void set_handle_area(HandleArea* area) { _handle_area = area; }
441
442 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
443 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
444
445 // Thread-Local Allocation Buffer (TLAB) support
446 ThreadLocalAllocBuffer& tlab() { return _tlab; }
447 void initialize_tlab() {
448 if (UseTLAB) {
449 tlab().initialize();
450 }
451 }
452
453 jlong allocated_bytes() { return _allocated_bytes; }
454 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
455 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
456 inline jlong cooked_allocated_bytes();
457
458 TraceBuffer *trace_buffer() { return _trace_buffer; }
459 void set_trace_buffer(TraceBuffer *b) { _trace_buffer = b; }
460 DEBUG_ONLY(bool trace_active() { return _trace_active; })
461 DEBUG_ONLY(void toggle_trace_active() { _trace_active = !_trace_active; })
462 void set_park_last_global_seq(intptr_t seq) { _park_last_global_seq = seq; }
463 static ByteSize park_last_global_seq_offset() { return byte_offset_of(Thread, _park_last_global_seq); }
464 int park_priority() { return _park_priority; }
465 static ByteSize park_priority_offset() { return byte_offset_of(Thread, _park_priority); }
466 int nesting_level() { return _nesting_level; }
467 static ByteSize nesting_level_offset() { return byte_offset_of(Thread, _nesting_level); }
468 address& memento_original_return_address() { return _memento_original_return_address; }
469 static ByteSize memento_original_return_address_offset() { return byte_offset_of(Thread, _memento_original_return_address); }
470 const CachedTraceStack *memento_stack_trace() { return _memento_stack_trace; }
471 void set_memento_stack_trace(const CachedTraceStack *ts) { _memento_stack_trace = ts; }
472
473 TRACE_DATA* trace_data() { return &_trace_data; }
474
475 const ThreadExt& ext() const { return _ext; }
476 ThreadExt& ext() { return _ext; }
477
478 // VM operation support
479 int vm_operation_ticket() { return ++_vm_operation_started_count; }
480 int vm_operation_completed_count() { return _vm_operation_completed_count; }
481 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
482
483 // For tracking the heavyweight monitor the thread is pending on.
484 ObjectMonitor* current_pending_monitor() {
485 return _current_pending_monitor;
486 }
487 void set_current_pending_monitor(ObjectMonitor* monitor) {
488 _current_pending_monitor = monitor;
489 }
490 void set_current_pending_monitor_is_from_java(bool from_java) {
491 _current_pending_monitor_is_from_java = from_java;
492 }
493 bool current_pending_monitor_is_from_java() {
494 return _current_pending_monitor_is_from_java;
495 }
496
497 // For tracking the ObjectMonitor on which this thread called Object.wait()
498 ObjectMonitor* current_waiting_monitor() {
499 return _current_waiting_monitor;
500 }
501 void set_current_waiting_monitor(ObjectMonitor* monitor) {
502 _current_waiting_monitor = monitor;
503 }
504
505 // GC support
506 // Apply "f->do_oop" to all root oops in "this".
507 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
508 // Used by JavaThread::oops_do.
509 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
510 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
511
512 // Handles the parallel case for the method below.
513 private:
514 bool claim_oops_do_par_case(int collection_parity);
515 public:
516 // Requires that "collection_parity" is that of the current roots
517 // iteration. If "is_par" is false, sets the parity of "this" to
518 // "collection_parity", and returns "true". If "is_par" is true,
519 // uses an atomic instruction to set the current threads parity to
520 // "collection_parity", if it is not already. Returns "true" iff the
521 // calling thread does the update, this indicates that the calling thread
522 // has claimed the thread's stack as a root groop in the current
523 // collection.
524 bool claim_oops_do(bool is_par, int collection_parity) {
525 if (!is_par) {
526 _oops_do_parity = collection_parity;
527 return true;
528 } else {
529 return claim_oops_do_par_case(collection_parity);
530 }
531 }
532
533 // Sweeper support
534 void nmethods_do(CodeBlobClosure* cf);
535
536 // jvmtiRedefineClasses support
537 void metadata_do(void f(Metadata*));
538
539 // Used by fast lock support
540 virtual bool is_lock_owned(address adr) const;
541
542 // Check if address is in the stack of the thread (not just for locks).
543 // Warning: the method can only be used on the running thread
544 bool is_in_stack(address adr) const;
545 // Check if address is in the usable part of the stack (excludes protected
546 // guard pages)
547 bool is_in_usable_stack(address adr) const;
548
549 // Sets this thread as starting thread. Returns failure if thread
550 // creation fails due to lack of memory, too many threads etc.
551 bool set_as_starting_thread();
552
553 void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; }
554 MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; }
555
556 protected:
557 // OS data associated with the thread
558 OSThread* _osthread; // Platform-specific thread information
559
560 // Thread local resource area for temporary allocation within the VM
561 ResourceArea* _resource_area;
562
563 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
564
565 // Thread local handle area for allocation of handles within the VM
566 HandleArea* _handle_area;
567 GrowableArray<Metadata*>* _metadata_handles;
568
569 // Support for stack overflow handling, get_thread, etc.
570 address _stack_base;
571 size_t _stack_size;
572 uintptr_t _self_raw_id; // used by get_thread (mutable)
573 int _lgrp_id;
574
575 public:
576 // Stack overflow support
577 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
578
579 void set_stack_base(address base) { _stack_base = base; }
580 size_t stack_size() const { return _stack_size; }
581 void set_stack_size(size_t size) { _stack_size = size; }
582 void record_stack_base_and_size();
583
584 bool on_local_stack(address adr) const {
585 /* QQQ this has knowledge of direction, ought to be a stack method */
586 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
587 }
588
589 uintptr_t self_raw_id() { return _self_raw_id; }
590 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
591
592 int lgrp_id() const { return _lgrp_id; }
593 void set_lgrp_id(int value) { _lgrp_id = value; }
594
595 // Printing
596 void print_on(outputStream* st) const;
597 void print() const { print_on(tty); }
598 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
599
600 // Debug-only code
601 #ifdef ASSERT
602 private:
603 // Deadlock detection support for Mutex locks. List of locks own by thread.
604 Monitor* _owned_locks;
605 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
606 // thus the friendship
607 friend class Mutex;
608 friend class Monitor;
609
610 public:
611 void print_owned_locks_on(outputStream* st) const;
612 void print_owned_locks() const { print_owned_locks_on(tty); }
613 Monitor* owned_locks() const { return _owned_locks; }
614 bool owns_locks() const { return owned_locks() != NULL; }
615 bool owns_locks_but_compiled_lock() const;
616
617 // Deadlock detection
618 bool allow_allocation() { return _allow_allocation_count == 0; }
619 ResourceMark* current_resource_mark() { return _current_resource_mark; }
620 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
621 #endif
622
623 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
624
625 private:
626 volatile int _jvmti_env_iteration_count;
627
628 public:
629 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
630 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
631 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
632
633 // Code generation
634 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
635 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
636 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
637
638 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
639 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
640
641 #define TLAB_FIELD_OFFSET(name) \
642 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
643
644 TLAB_FIELD_OFFSET(start)
645 TLAB_FIELD_OFFSET(end)
646 TLAB_FIELD_OFFSET(top)
647 TLAB_FIELD_OFFSET(pf_top)
648 TLAB_FIELD_OFFSET(size) // desired_size
649 TLAB_FIELD_OFFSET(refill_waste_limit)
650 TLAB_FIELD_OFFSET(number_of_refills)
651 TLAB_FIELD_OFFSET(fast_refill_waste)
652 TLAB_FIELD_OFFSET(slow_allocations)
653
654 #undef TLAB_FIELD_OFFSET
655
656 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
657
658 public:
659 volatile intptr_t _Stalled ;
660 volatile int _TypeTag ;
661 ParkEvent * _ParkEvent ; // for synchronized()
662 ParkEvent * _SleepEvent ; // for Thread.sleep
663 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
664 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
665 int NativeSyncRecursion ; // diagnostic
666
667 volatile int _OnTrap ; // Resume-at IP delta
668 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
669 jint _hashStateX ; // thread-specific hashCode generator state
670 jint _hashStateY ;
671 jint _hashStateZ ;
672 void * _schedctl ;
673
674
675 volatile jint rng [4] ; // RNG for spin loop
676
677 // Low-level leaf-lock primitives used to implement synchronization
678 // and native monitor-mutex infrastructure.
679 // Not for general synchronization use.
680 static void SpinAcquire (volatile int * Lock, const char * Name) ;
681 static void SpinRelease (volatile int * Lock) ;
682 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
683 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
684 static void muxRelease (volatile intptr_t * Lock) ;
685 };
686
687 // Inline implementation of Thread::current()
688 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
689 // startup.
690 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
691 // period. This is inlined in thread_<os_family>.inline.hpp.
692
693 inline Thread* Thread::current() {
694 #ifdef ASSERT
695 // This function is very high traffic. Define PARANOID to enable expensive
696 // asserts.
697 #ifdef PARANOID
698 // Signal handler should call ThreadLocalStorage::get_thread_slow()
699 Thread* t = ThreadLocalStorage::get_thread_slow();
700 assert(t != NULL && !t->is_inside_signal_handler(),
701 "Don't use Thread::current() inside signal handler");
702 #endif
703 #endif
704 Thread* thread = ThreadLocalStorage::thread();
705 assert(thread != NULL, "just checking");
706 return thread;
707 }
708
709 // Name support for threads. non-JavaThread subclasses with multiple
710 // uniquely named instances should derive from this.
711 class NamedThread: public Thread {
712 friend class VMStructs;
713 enum {
714 max_name_len = 64
715 };
716 private:
717 char* _name;
718 // log JavaThread being processed by oops_do
719 JavaThread* _processed_thread;
720
721 public:
722 NamedThread();
723 ~NamedThread();
724 // May only be called once per thread.
725 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
726 virtual bool is_Named_thread() const { return true; }
727 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
728 JavaThread *processed_thread() { return _processed_thread; }
729 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
730 };
731
732 // Worker threads are named and have an id of an assigned work.
733 class WorkerThread: public NamedThread {
734 private:
735 uint _id;
736 public:
737 WorkerThread() : _id(0) { }
738 virtual bool is_Worker_thread() const { return true; }
739
740 virtual WorkerThread* as_Worker_thread() const {
741 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
742 return (WorkerThread*) this;
743 }
744
745 void set_id(uint work_id) { _id = work_id; }
746 uint id() const { return _id; }
747 };
748
749 // A single WatcherThread is used for simulating timer interrupts.
750 class WatcherThread: public Thread {
751 friend class VMStructs;
752 public:
753 virtual void run();
754
755 private:
756 static WatcherThread* _watcher_thread;
757
758 static bool _startable;
759 volatile static bool _should_terminate; // updated without holding lock
760
761 os::WatcherThreadCrashProtection* _crash_protection;
762 public:
763 enum SomeConstants {
764 delay_interval = 10 // interrupt delay in milliseconds
765 };
766
767 // Constructor
768 WatcherThread();
769
770 // Tester
771 bool is_Watcher_thread() const { return true; }
772
773 // Printing
774 char* name() const { return (char*)"VM Periodic Task Thread"; }
775 void print_on(outputStream* st) const;
776 void print() const { print_on(tty); }
777 void unpark();
778
779 // Returns the single instance of WatcherThread
780 static WatcherThread* watcher_thread() { return _watcher_thread; }
781
782 // Create and start the single instance of WatcherThread, or stop it on shutdown
783 static void start();
784 static void stop();
785 // Only allow start once the VM is sufficiently initialized
786 // Otherwise the first task to enroll will trigger the start
787 static void make_startable();
788
789 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
790 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
791 _crash_protection = crash_protection;
792 }
793
794 bool has_crash_protection() const { return _crash_protection != NULL; }
795 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
796
797 private:
798 int sleep() const;
799 };
800
801
802 class CompilerThread;
803
804 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
805
806 class JavaThread: public Thread {
807 friend class VMStructs;
808 private:
809 JavaThread* _next; // The next thread in the Threads list
810 oop _threadObj; // The Java level thread object
811
812 #ifdef ASSERT
813 private:
814 int _java_call_counter;
815
816 public:
817 int java_call_counter() { return _java_call_counter; }
818 void inc_java_call_counter() { _java_call_counter++; }
819 void dec_java_call_counter() {
820 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
821 _java_call_counter--;
822 }
823 private: // restore original namespace restriction
824 #endif // ifdef ASSERT
825
826 #ifndef PRODUCT
827 public:
828 enum {
829 jump_ring_buffer_size = 16
830 };
831 private: // restore original namespace restriction
832 #endif
833
834 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
835
836 ThreadFunction _entry_point;
837
838 JNIEnv _jni_environment;
839
840 // Deopt support
841 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
842
843 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
844 // transition out of native
845 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
846 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
847 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
848 // Because deoptimization is lazy we must save jvmti requests to set locals
849 // in compiled frames until we deoptimize and we have an interpreter frame.
850 // This holds the pointer to array (yeah like there might be more than one) of
851 // description of compiled vframes that have locals that need to be updated.
852 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
853
854 // Handshake value for fixing 6243940. We need a place for the i2c
855 // adapter to store the callee Method*. This value is NEVER live
856 // across a gc point so it does NOT have to be gc'd
857 // The handshake is open ended since we can't be certain that it will
858 // be NULLed. This is because we rarely ever see the race and end up
859 // in handle_wrong_method which is the backend of the handshake. See
860 // code in i2c adapters and handle_wrong_method.
861
862 Method* _callee_target;
863
864 // Used to pass back results to the interpreter or generated code running Java code.
865 oop _vm_result; // oop result is GC-preserved
866 Metadata* _vm_result_2; // non-oop result
867
868 // See ReduceInitialCardMarks: this holds the precise space interval of
869 // the most recent slow path allocation for which compiled code has
870 // elided card-marks for performance along the fast-path.
871 MemRegion _deferred_card_mark;
872
873 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
874 // allocated during deoptimization
875 // and by JNI_MonitorEnter/Exit
876
877 // Async. requests support
878 enum AsyncRequests {
879 _no_async_condition = 0,
880 _async_exception,
881 _async_unsafe_access_error
882 };
883 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
884 oop _pending_async_exception;
885
886 // Safepoint support
887 public: // Expose _thread_state for SafeFetchInt()
888 volatile JavaThreadState _thread_state;
889 private:
890 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
891 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
892
893 // JavaThread termination support
894 enum TerminatedTypes {
895 _not_terminated = 0xDEAD - 2,
896 _thread_exiting, // JavaThread::exit() has been called for this thread
897 _thread_terminated, // JavaThread is removed from thread list
898 _vm_exited // JavaThread is still executing native code, but VM is terminated
899 // only VM_Exit can set _vm_exited
900 };
901
902 // In general a JavaThread's _terminated field transitions as follows:
903 //
904 // _not_terminated => _thread_exiting => _thread_terminated
905 //
906 // _vm_exited is a special value to cover the case of a JavaThread
907 // executing native code after the VM itself is terminated.
908 volatile TerminatedTypes _terminated;
909 // suspend/resume support
910 volatile bool _suspend_equivalent; // Suspend equivalent condition
911 jint _in_deopt_handler; // count of deoptimization
912 // handlers thread is in
913 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
914 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
915 // never locked) when throwing an exception. Used by interpreter only.
916
917 // JNI attach states:
918 enum JNIAttachStates {
919 _not_attaching_via_jni = 1, // thread is not attaching via JNI
920 _attaching_via_jni, // thread is attaching via JNI
921 _attached_via_jni // thread has attached via JNI
922 };
923
924 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
925 // A native thread that is attaching via JNI starts with a value
926 // of _attaching_via_jni and transitions to _attached_via_jni.
927 volatile JNIAttachStates _jni_attach_state;
928
929 public:
930 // State of the stack guard pages for this thread.
931 enum StackGuardState {
932 stack_guard_unused, // not needed
933 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
934 stack_guard_enabled // enabled
935 };
936
937 private:
938
939 StackGuardState _stack_guard_state;
940
941 // Precompute the limit of the stack as used in stack overflow checks.
942 // We load it from here to simplify the stack overflow check in assembly.
943 address _stack_overflow_limit;
944
945 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
946 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
947 // code)
948 volatile oop _exception_oop; // Exception thrown in compiled code
949 volatile address _exception_pc; // PC where exception happened
950 volatile address _exception_handler_pc; // PC for handler of exception
951 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
952
953 // support for JNI critical regions
954 jint _jni_active_critical; // count of entries into JNI critical region
955
956 // Checked JNI: function name requires exception check
957 char* _pending_jni_exception_check_fn;
958
959 // For deadlock detection.
960 int _depth_first_number;
961
962 // JVMTI PopFrame support
963 // This is set to popframe_pending to signal that top Java frame should be popped immediately
964 int _popframe_condition;
965
966 // If reallocation of scalar replaced objects fails, we throw OOM
967 // and during exception propagation, pop the top
968 // _frames_to_pop_failed_realloc frames, the ones that reference
969 // failed reallocations.
970 int _frames_to_pop_failed_realloc;
971
972 #ifndef PRODUCT
973 int _jmp_ring_index;
974 struct {
975 // We use intptr_t instead of address so debugger doesn't try and display strings
976 intptr_t _target;
977 intptr_t _instruction;
978 const char* _file;
979 int _line;
980 } _jmp_ring[ jump_ring_buffer_size ];
981 #endif /* PRODUCT */
982
983 #if INCLUDE_ALL_GCS
984 // Support for G1 barriers
985
986 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
987 // Set of all such queues.
988 static SATBMarkQueueSet _satb_mark_queue_set;
989
990 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
991 // Set of all such queues.
992 static DirtyCardQueueSet _dirty_card_queue_set;
993
994 void flush_barrier_queues();
995 #endif // INCLUDE_ALL_GCS
996
997 friend class VMThread;
998 friend class ThreadWaitTransition;
999 friend class VM_Exit;
1000
1001 void initialize(); // Initialized the instance variables
1002
1003 public:
1004 // Constructor
1005 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1006 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1007 ~JavaThread();
1008
1009 #ifdef ASSERT
1010 // verify this JavaThread hasn't be published in the Threads::list yet
1011 void verify_not_published();
1012 #endif
1013
1014 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1015 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1016 _jni_environment.functions = functionTable;
1017 }
1018 struct JNINativeInterface_* get_jni_functions() {
1019 return (struct JNINativeInterface_ *)_jni_environment.functions;
1020 }
1021
1022 // This function is called at thread creation to allow
1023 // platform specific thread variables to be initialized.
1024 void cache_global_variables();
1025
1026 // Executes Shutdown.shutdown()
1027 void invoke_shutdown_hooks();
1028
1029 // Cleanup on thread exit
1030 enum ExitType {
1031 normal_exit,
1032 jni_detach
1033 };
1034 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1035
1036 void cleanup_failed_attach_current_thread();
1037
1038 // Testers
1039 virtual bool is_Java_thread() const { return true; }
1040
1041 // Thread chain operations
1042 JavaThread* next() const { return _next; }
1043 void set_next(JavaThread* p) { _next = p; }
1044
1045 // Thread oop. threadObj() can be NULL for initial JavaThread
1046 // (or for threads attached via JNI)
1047 oop threadObj() const { return _threadObj; }
1048 void set_threadObj(oop p) { _threadObj = p; }
1049
1050 ThreadPriority java_priority() const; // Read from threadObj()
1051
1052 // Prepare thread and add to priority queue. If a priority is
1053 // not specified, use the priority of the thread object. Threads_lock
1054 // must be held while this function is called.
1055 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1056 void prepare_ext();
1057
1058 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1059 address saved_exception_pc() { return _saved_exception_pc; }
1060
1061
1062 ThreadFunction entry_point() const { return _entry_point; }
1063
1064 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1065 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1066
1067 // Last frame anchor routines
1068
1069 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1070
1071 // last_Java_sp
1072 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1073 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1074
1075 // last_Java_pc
1076
1077 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1078
1079 // Safepoint support
1080 #ifndef PPC64
1081 JavaThreadState thread_state() const { return _thread_state; }
1082 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1083 #else
1084 // Use membars when accessing volatile _thread_state. See
1085 // Threads::create_vm() for size checks.
1086 inline JavaThreadState thread_state() const;
1087 inline void set_thread_state(JavaThreadState s);
1088 #endif
1089 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1090 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1091 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1092
1093 // thread has called JavaThread::exit() or is terminated
1094 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1095 // thread is terminated (no longer on the threads list); we compare
1096 // against the two non-terminated values so that a freed JavaThread
1097 // will also be considered terminated.
1098 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1099 void set_terminated(TerminatedTypes t) { _terminated = t; }
1100 // special for Threads::remove() which is static:
1101 void set_terminated_value() { _terminated = _thread_terminated; }
1102 void block_if_vm_exited();
1103
1104 bool doing_unsafe_access() { return _doing_unsafe_access; }
1105 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1106
1107 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1108 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1109
1110 // Suspend/resume support for JavaThread
1111 private:
1112 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1113 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1114
1115 public:
1116 void java_suspend();
1117 void java_resume();
1118 int java_suspend_self();
1119
1120 void check_and_wait_while_suspended() {
1121 assert(JavaThread::current() == this, "sanity check");
1122
1123 bool do_self_suspend;
1124 do {
1125 // were we externally suspended while we were waiting?
1126 do_self_suspend = handle_special_suspend_equivalent_condition();
1127 if (do_self_suspend) {
1128 // don't surprise the thread that suspended us by returning
1129 java_suspend_self();
1130 set_suspend_equivalent();
1131 }
1132 } while (do_self_suspend);
1133 }
1134 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1135 // Check for async exception in addition to safepoint and suspend request.
1136 static void check_special_condition_for_native_trans(JavaThread *thread);
1137
1138 // Same as check_special_condition_for_native_trans but finishes the
1139 // transition into thread_in_Java mode so that it can potentially
1140 // block.
1141 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1142
1143 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1144 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1145 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1146 // Warning: is_ext_suspend_completed() may temporarily drop the
1147 // SR_lock to allow the thread to reach a stable thread state if
1148 // it is currently in a transient thread state.
1149 return is_ext_suspend_completed(false /*!called_by_wait */,
1150 SuspendRetryDelay, bits);
1151 }
1152
1153 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1154 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1155 // passed as the count and delay parameters. Experiments with specific
1156 // calls to wait_for_ext_suspend_completion() can be done by passing
1157 // other values in the code. Experiments with all calls can be done
1158 // via the appropriate -XX options.
1159 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1160
1161 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1162 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1163
1164 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1165 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1166 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1167
1168 bool is_external_suspend() const {
1169 return (_suspend_flags & _external_suspend) != 0;
1170 }
1171 // Whenever a thread transitions from native to vm/java it must suspend
1172 // if external|deopt suspend is present.
1173 bool is_suspend_after_native() const {
1174 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1175 }
1176
1177 // external suspend request is completed
1178 bool is_ext_suspended() const {
1179 return (_suspend_flags & _ext_suspended) != 0;
1180 }
1181
1182 bool is_external_suspend_with_lock() const {
1183 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1184 return is_external_suspend();
1185 }
1186
1187 // Special method to handle a pending external suspend request
1188 // when a suspend equivalent condition lifts.
1189 bool handle_special_suspend_equivalent_condition() {
1190 assert(is_suspend_equivalent(),
1191 "should only be called in a suspend equivalence condition");
1192 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1193 bool ret = is_external_suspend();
1194 if (!ret) {
1195 // not about to self-suspend so clear suspend equivalence
1196 clear_suspend_equivalent();
1197 }
1198 // implied else:
1199 // We have a pending external suspend request so we leave the
1200 // suspend_equivalent flag set until java_suspend_self() sets
1201 // the ext_suspended flag and clears the suspend_equivalent
1202 // flag. This insures that wait_for_ext_suspend_completion()
1203 // will return consistent values.
1204 return ret;
1205 }
1206
1207 // utility methods to see if we are doing some kind of suspension
1208 bool is_being_ext_suspended() const {
1209 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1210 return is_ext_suspended() || is_external_suspend();
1211 }
1212
1213 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1214
1215 void set_suspend_equivalent() { _suspend_equivalent = true; };
1216 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1217
1218 // Thread.stop support
1219 void send_thread_stop(oop throwable);
1220 AsyncRequests clear_special_runtime_exit_condition() {
1221 AsyncRequests x = _special_runtime_exit_condition;
1222 _special_runtime_exit_condition = _no_async_condition;
1223 return x;
1224 }
1225
1226 // Are any async conditions present?
1227 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1228
1229 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1230
1231 // these next two are also used for self-suspension and async exception support
1232 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1233
1234 // Return true if JavaThread has an asynchronous condition or
1235 // if external suspension is requested.
1236 bool has_special_runtime_exit_condition() {
1237 // We call is_external_suspend() last since external suspend should
1238 // be less common. Because we don't use is_external_suspend_with_lock
1239 // it is possible that we won't see an asynchronous external suspend
1240 // request that has just gotten started, i.e., SR_lock grabbed but
1241 // _external_suspend field change either not made yet or not visible
1242 // yet. However, this is okay because the request is asynchronous and
1243 // we will see the new flag value the next time through. It's also
1244 // possible that the external suspend request is dropped after
1245 // we have checked is_external_suspend(), we will recheck its value
1246 // under SR_lock in java_suspend_self().
1247 return (_special_runtime_exit_condition != _no_async_condition) ||
1248 is_external_suspend() || is_deopt_suspend();
1249 }
1250
1251 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1252
1253 void set_pending_async_exception(oop e) {
1254 _pending_async_exception = e;
1255 _special_runtime_exit_condition = _async_exception;
1256 set_has_async_exception();
1257 }
1258
1259 // Fast-locking support
1260 bool is_lock_owned(address adr) const;
1261
1262 // Accessors for vframe array top
1263 // The linked list of vframe arrays are sorted on sp. This means when we
1264 // unpack the head must contain the vframe array to unpack.
1265 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1266 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1267
1268 // Side structure for defering update of java frame locals until deopt occurs
1269 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1270 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1271
1272 // These only really exist to make debugging deopt problems simpler
1273
1274 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1275 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1276
1277 // The special resourceMark used during deoptimization
1278
1279 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1280 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1281
1282 intptr_t* must_deopt_id() { return _must_deopt_id; }
1283 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1284 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1285
1286 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1287 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1288
1289 Method* callee_target() const { return _callee_target; }
1290 void set_callee_target (Method* x) { _callee_target = x; }
1291
1292 // Oop results of vm runtime calls
1293 oop vm_result() const { return _vm_result; }
1294 void set_vm_result (oop x) { _vm_result = x; }
1295
1296 Metadata* vm_result_2() const { return _vm_result_2; }
1297 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1298
1299 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1300 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1301
1302 // Exception handling for compiled methods
1303 oop exception_oop() const { return _exception_oop; }
1304 address exception_pc() const { return _exception_pc; }
1305 address exception_handler_pc() const { return _exception_handler_pc; }
1306 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1307
1308 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1309 void set_exception_pc(address a) { _exception_pc = a; }
1310 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1311 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1312
1313 void clear_exception_oop_and_pc() {
1314 set_exception_oop(NULL);
1315 set_exception_pc(NULL);
1316 }
1317
1318 // Stack overflow support
1319 inline size_t stack_available(address cur_sp);
1320 address stack_yellow_zone_base()
1321 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1322 size_t stack_yellow_zone_size()
1323 { return StackYellowPages * os::vm_page_size(); }
1324 address stack_red_zone_base()
1325 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1326 size_t stack_red_zone_size()
1327 { return StackRedPages * os::vm_page_size(); }
1328 bool in_stack_yellow_zone(address a)
1329 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1330 bool in_stack_red_zone(address a)
1331 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1332
1333 void create_stack_guard_pages();
1334 void remove_stack_guard_pages();
1335
1336 void enable_stack_yellow_zone();
1337 void disable_stack_yellow_zone();
1338 void enable_stack_red_zone();
1339 void disable_stack_red_zone();
1340
1341 inline bool stack_guard_zone_unused();
1342 inline bool stack_yellow_zone_disabled();
1343 inline bool stack_yellow_zone_enabled();
1344
1345 // Attempt to reguard the stack after a stack overflow may have occurred.
1346 // Returns true if (a) guard pages are not needed on this thread, (b) the
1347 // pages are already guarded, or (c) the pages were successfully reguarded.
1348 // Returns false if there is not enough stack space to reguard the pages, in
1349 // which case the caller should unwind a frame and try again. The argument
1350 // should be the caller's (approximate) sp.
1351 bool reguard_stack(address cur_sp);
1352 // Similar to above but see if current stackpoint is out of the guard area
1353 // and reguard if possible.
1354 bool reguard_stack(void);
1355
1356 address stack_overflow_limit() { return _stack_overflow_limit; }
1357 void set_stack_overflow_limit() {
1358 _stack_overflow_limit = _stack_base - _stack_size +
1359 ((StackShadowPages +
1360 StackYellowPages +
1361 StackRedPages) * os::vm_page_size());
1362 }
1363
1364 // Misc. accessors/mutators
1365 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1366 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1367 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1368
1369 #ifndef PRODUCT
1370 void record_jump(address target, address instr, const char* file, int line);
1371 #endif /* PRODUCT */
1372
1373 // For assembly stub generation
1374 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1375 #ifndef PRODUCT
1376 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1377 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1378 #endif /* PRODUCT */
1379 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1380 static ByteSize last_Java_sp_offset() {
1381 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1382 }
1383 static ByteSize last_Java_pc_offset() {
1384 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1385 }
1386 static ByteSize frame_anchor_offset() {
1387 return byte_offset_of(JavaThread, _anchor);
1388 }
1389 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1390 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1391 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1392 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1393 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1394 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1395 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1396 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1397 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1398 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1399 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1400 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1401 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1402
1403 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1404 static ByteSize should_post_on_exceptions_flag_offset() {
1405 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1406 }
1407
1408 #if INCLUDE_ALL_GCS
1409 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1410 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1411 #endif // INCLUDE_ALL_GCS
1412
1413 // Returns the jni environment for this thread
1414 JNIEnv* jni_environment() { return &_jni_environment; }
1415
1416 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1417 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1418 // Only return NULL if thread is off the thread list; starting to
1419 // exit should not return NULL.
1420 if (thread_from_jni_env->is_terminated()) {
1421 thread_from_jni_env->block_if_vm_exited();
1422 return NULL;
1423 } else {
1424 return thread_from_jni_env;
1425 }
1426 }
1427
1428 // JNI critical regions. These can nest.
1429 bool in_critical() { return _jni_active_critical > 0; }
1430 bool in_last_critical() { return _jni_active_critical == 1; }
1431 void enter_critical() { assert(Thread::current() == this ||
1432 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1433 "this must be current thread or synchronizing");
1434 _jni_active_critical++; }
1435 void exit_critical() { assert(Thread::current() == this,
1436 "this must be current thread");
1437 _jni_active_critical--;
1438 assert(_jni_active_critical >= 0,
1439 "JNI critical nesting problem?"); }
1440
1441 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1442 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1443 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1444 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1445 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1446
1447 // For deadlock detection
1448 int depth_first_number() { return _depth_first_number; }
1449 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1450
1451 private:
1452 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1453
1454 public:
1455 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1456 void add_monitor_chunk(MonitorChunk* chunk);
1457 void remove_monitor_chunk(MonitorChunk* chunk);
1458 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1459 void inc_in_deopt_handler() { _in_deopt_handler++; }
1460 void dec_in_deopt_handler() {
1461 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1462 if (_in_deopt_handler > 0) { // robustness
1463 _in_deopt_handler--;
1464 }
1465 }
1466
1467 private:
1468 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1469
1470 public:
1471
1472 // Frame iteration; calls the function f for all frames on the stack
1473 void frames_do(void f(frame*, const RegisterMap*));
1474
1475 // Memory operations
1476 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1477
1478 // Sweeper operations
1479 void nmethods_do(CodeBlobClosure* cf);
1480
1481 // RedefineClasses Support
1482 void metadata_do(void f(Metadata*));
1483
1484 // Memory management operations
1485 void gc_epilogue();
1486 void gc_prologue();
1487
1488 // Misc. operations
1489 char* name() const { return (char*)get_thread_name(); }
1490 void print_on(outputStream* st) const;
1491 void print() const { print_on(tty); }
1492 void print_value();
1493 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1494 void print_thread_state() const PRODUCT_RETURN;
1495 void print_on_error(outputStream* st, char* buf, int buflen) const;
1496 void verify();
1497 const char* get_thread_name() const;
1498 private:
1499 // factor out low-level mechanics for use in both normal and error cases
1500 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1501 public:
1502 const char* get_threadgroup_name() const;
1503 const char* get_parent_name() const;
1504
1505 // Accessing frames
1506 frame last_frame() {
1507 _anchor.make_walkable(this);
1508 return pd_last_frame();
1509 }
1510 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1511
1512 // Returns method at 'depth' java or native frames down the stack
1513 // Used for security checks
1514 Klass* security_get_caller_class(int depth);
1515
1516 // Print stack trace in external format
1517 void print_stack_on(outputStream* st);
1518 void print_stack() { print_stack_on(tty); }
1519
1520 // Print stack traces in various internal formats
1521 void trace_stack() PRODUCT_RETURN;
1522 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1523 void trace_frames() PRODUCT_RETURN;
1524 void trace_oops() PRODUCT_RETURN;
1525
1526 // Print an annotated view of the stack frames
1527 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1528 void validate_frame_layout() {
1529 print_frame_layout(0, true);
1530 }
1531
1532 // Returns the number of stack frames on the stack
1533 int depth() const;
1534
1535 // Function for testing deoptimization
1536 void deoptimize();
1537 void make_zombies();
1538
1539 void deoptimized_wrt_marked_nmethods();
1540
1541 // Profiling operation (see fprofile.cpp)
1542 public:
1543 bool profile_last_Java_frame(frame* fr);
1544
1545 private:
1546 ThreadProfiler* _thread_profiler;
1547 private:
1548 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1549 friend class FlatProfilerTask; // uses get_thread_profiler.
1550 friend class ThreadProfilerMark; // uses get_thread_profiler.
1551 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1552 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1553 ThreadProfiler* result = _thread_profiler;
1554 _thread_profiler = tp;
1555 return result;
1556 }
1557
1558 public:
1559 // Returns the running thread as a JavaThread
1560 static inline JavaThread* current();
1561
1562 // Returns the active Java thread. Do not use this if you know you are calling
1563 // from a JavaThread, as it's slower than JavaThread::current. If called from
1564 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1565 // operation. You may not want that either.
1566 static JavaThread* active();
1567
1568 inline CompilerThread* as_CompilerThread();
1569
1570 public:
1571 virtual void run();
1572 void thread_main_inner();
1573
1574 private:
1575 // PRIVILEGED STACK
1576 PrivilegedElement* _privileged_stack_top;
1577 GrowableArray<oop>* _array_for_gc;
1578 public:
1579
1580 // Returns the privileged_stack information.
1581 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1582 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1583 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1584
1585 public:
1586 // Thread local information maintained by JVMTI.
1587 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1588 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1589 // getter is used to get this JavaThread's JvmtiThreadState if it has
1590 // one which means NULL can be returned. JvmtiThreadState::state_for()
1591 // is used to get the specified JavaThread's JvmtiThreadState if it has
1592 // one or it allocates a new JvmtiThreadState for the JavaThread and
1593 // returns it. JvmtiThreadState::state_for() will return NULL only if
1594 // the specified JavaThread is exiting.
1595 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1596 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1597 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1598 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1599
1600 // JVMTI PopFrame support
1601 // Setting and clearing popframe_condition
1602 // All of these enumerated values are bits. popframe_pending
1603 // indicates that a PopFrame() has been requested and not yet been
1604 // completed. popframe_processing indicates that that PopFrame() is in
1605 // the process of being completed. popframe_force_deopt_reexecution_bit
1606 // indicates that special handling is required when returning to a
1607 // deoptimized caller.
1608 enum PopCondition {
1609 popframe_inactive = 0x00,
1610 popframe_pending_bit = 0x01,
1611 popframe_processing_bit = 0x02,
1612 popframe_force_deopt_reexecution_bit = 0x04
1613 };
1614 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1615 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1616 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1617 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1618 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1619 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1620 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1621 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1622 #ifdef CC_INTERP
1623 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1624 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1625 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1626 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1627 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1628 #endif
1629
1630 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1631 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1632 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1633
1634 private:
1635 // Saved incoming arguments to popped frame.
1636 // Used only when popped interpreted frame returns to deoptimized frame.
1637 void* _popframe_preserved_args;
1638 int _popframe_preserved_args_size;
1639
1640 public:
1641 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1642 void* popframe_preserved_args();
1643 ByteSize popframe_preserved_args_size();
1644 WordSize popframe_preserved_args_size_in_words();
1645 void popframe_free_preserved_args();
1646
1647
1648 private:
1649 JvmtiThreadState *_jvmti_thread_state;
1650 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1651
1652 // Used by the interpreter in fullspeed mode for frame pop, method
1653 // entry, method exit and single stepping support. This field is
1654 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1655 // It can be set to zero asynchronously (i.e., without a VM operation
1656 // or a lock) so we have to be very careful.
1657 int _interp_only_mode;
1658
1659 public:
1660 // used by the interpreter for fullspeed debugging support (see above)
1661 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1662 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1663 int get_interp_only_mode() { return _interp_only_mode; }
1664 void increment_interp_only_mode() { ++_interp_only_mode; }
1665 void decrement_interp_only_mode() { --_interp_only_mode; }
1666
1667 // support for cached flag that indicates whether exceptions need to be posted for this thread
1668 // if this is false, we can avoid deoptimizing when events are thrown
1669 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1670 private:
1671 int _should_post_on_exceptions_flag;
1672
1673 public:
1674 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1675 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1676
1677 private:
1678 ThreadStatistics *_thread_stat;
1679
1680 public:
1681 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1682
1683 // Return a blocker object for which this thread is blocked parking.
1684 oop current_park_blocker();
1685
1686 private:
1687 static size_t _stack_size_at_create;
1688
1689 public:
1690 static inline size_t stack_size_at_create(void) {
1691 return _stack_size_at_create;
1692 }
1693 static inline void set_stack_size_at_create(size_t value) {
1694 _stack_size_at_create = value;
1695 }
1696
1697 #if INCLUDE_ALL_GCS
1698 // SATB marking queue support
1699 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1700 static SATBMarkQueueSet& satb_mark_queue_set() {
1701 return _satb_mark_queue_set;
1702 }
1703
1704 // Dirty card queue support
1705 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1706 static DirtyCardQueueSet& dirty_card_queue_set() {
1707 return _dirty_card_queue_set;
1708 }
1709 #endif // INCLUDE_ALL_GCS
1710
1711 // This method initializes the SATB and dirty card queues before a
1712 // JavaThread is added to the Java thread list. Right now, we don't
1713 // have to do anything to the dirty card queue (it should have been
1714 // activated when the thread was created), but we have to activate
1715 // the SATB queue if the thread is created while a marking cycle is
1716 // in progress. The activation / de-activation of the SATB queues at
1717 // the beginning / end of a marking cycle is done during safepoints
1718 // so we have to make sure this method is called outside one to be
1719 // able to safely read the active field of the SATB queue set. Right
1720 // now, it is called just before the thread is added to the Java
1721 // thread list in the Threads::add() method. That method is holding
1722 // the Threads_lock which ensures we are outside a safepoint. We
1723 // cannot do the obvious and set the active field of the SATB queue
1724 // when the thread is created given that, in some cases, safepoints
1725 // might happen between the JavaThread constructor being called and the
1726 // thread being added to the Java thread list (an example of this is
1727 // when the structure for the DestroyJavaVM thread is created).
1728 #if INCLUDE_ALL_GCS
1729 void initialize_queues();
1730 #else // INCLUDE_ALL_GCS
1731 void initialize_queues() { }
1732 #endif // INCLUDE_ALL_GCS
1733
1734 // Machine dependent stuff
1735 #ifdef TARGET_OS_ARCH_linux_x86
1736 # include "thread_linux_x86.hpp"
1737 #endif
1738 #ifdef TARGET_OS_ARCH_linux_sparc
1739 # include "thread_linux_sparc.hpp"
1740 #endif
1741 #ifdef TARGET_OS_ARCH_linux_zero
1742 # include "thread_linux_zero.hpp"
1743 #endif
1744 #ifdef TARGET_OS_ARCH_solaris_x86
1745 # include "thread_solaris_x86.hpp"
1746 #endif
1747 #ifdef TARGET_OS_ARCH_solaris_sparc
1748 # include "thread_solaris_sparc.hpp"
1749 #endif
1750 #ifdef TARGET_OS_ARCH_windows_x86
1751 # include "thread_windows_x86.hpp"
1752 #endif
1753 #ifdef TARGET_OS_ARCH_linux_arm
1754 # include "thread_linux_arm.hpp"
1755 #endif
1756 #ifdef TARGET_OS_ARCH_linux_ppc
1757 # include "thread_linux_ppc.hpp"
1758 #endif
1759 #ifdef TARGET_OS_ARCH_aix_ppc
1760 # include "thread_aix_ppc.hpp"
1761 #endif
1762 #ifdef TARGET_OS_ARCH_bsd_x86
1763 # include "thread_bsd_x86.hpp"
1764 #endif
1765 #ifdef TARGET_OS_ARCH_bsd_zero
1766 # include "thread_bsd_zero.hpp"
1767 #endif
1768
1769
1770 public:
1771 void set_blocked_on_compilation(bool value) {
1772 _blocked_on_compilation = value;
1773 }
1774
1775 bool blocked_on_compilation() {
1776 return _blocked_on_compilation;
1777 }
1778 protected:
1779 bool _blocked_on_compilation;
1780
1781
1782 // JSR166 per-thread parker
1783 private:
1784 Parker* _parker;
1785 public:
1786 Parker* parker() { return _parker; }
1787
1788 // Biased locking support
1789 private:
1790 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1791 public:
1792 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1793 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1794
1795 // clearing/querying jni attach status
1796 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1797 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1798 inline void set_done_attaching_via_jni();
1799 private:
1800 // This field is used to determine if a thread has claimed
1801 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1802 // otherwise its value is the par_id that has been claimed.
1803 uint _claimed_par_id;
1804 public:
1805 uint get_claimed_par_id() { return _claimed_par_id; }
1806 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1807 };
1808
1809 // Inline implementation of JavaThread::current
1810 inline JavaThread* JavaThread::current() {
1811 Thread* thread = ThreadLocalStorage::thread();
1812 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1813 return (JavaThread*)thread;
1814 }
1815
1816 inline CompilerThread* JavaThread::as_CompilerThread() {
1817 assert(is_Compiler_thread(), "just checking");
1818 return (CompilerThread*)this;
1819 }
1820
1821 inline bool JavaThread::stack_guard_zone_unused() {
1822 return _stack_guard_state == stack_guard_unused;
1823 }
1824
1825 inline bool JavaThread::stack_yellow_zone_disabled() {
1826 return _stack_guard_state == stack_guard_yellow_disabled;
1827 }
1828
1829 inline bool JavaThread::stack_yellow_zone_enabled() {
1830 #ifdef ASSERT
1831 if (os::uses_stack_guard_pages()) {
1832 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1833 }
1834 #endif
1835 return _stack_guard_state == stack_guard_enabled;
1836 }
1837
1838 inline size_t JavaThread::stack_available(address cur_sp) {
1839 // This code assumes java stacks grow down
1840 address low_addr; // Limit on the address for deepest stack depth
1841 if ( _stack_guard_state == stack_guard_unused) {
1842 low_addr = stack_base() - stack_size();
1843 } else {
1844 low_addr = stack_yellow_zone_base();
1845 }
1846 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1847 }
1848
1849 // A thread used for Compilation.
1850 class CompilerThread : public JavaThread {
1851 friend class VMStructs;
1852 private:
1853 CompilerCounters* _counters;
1854
1855 ciEnv* _env;
1856 CompileLog* _log;
1857 CompileTask* _task;
1858 CompileQueue* _queue;
1859 BufferBlob* _buffer_blob;
1860
1861 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1862 AbstractCompiler* _compiler;
1863
1864 public:
1865
1866 static CompilerThread* current();
1867
1868 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1869
1870 bool is_Compiler_thread() const { return true; }
1871 // Hide this compiler thread from external view.
1872 bool is_hidden_from_external_view() const { return true; }
1873
1874 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1875 AbstractCompiler* compiler() const { return _compiler; }
1876
1877 CompileQueue* queue() const { return _queue; }
1878 CompilerCounters* counters() const { return _counters; }
1879
1880 // Get/set the thread's compilation environment.
1881 ciEnv* env() { return _env; }
1882 void set_env(ciEnv* env) { _env = env; }
1883
1884 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1885 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1886
1887 // Get/set the thread's logging information
1888 CompileLog* log() { return _log; }
1889 void init_log(CompileLog* log) {
1890 // Set once, for good.
1891 assert(_log == NULL, "set only once");
1892 _log = log;
1893 }
1894
1895 // GC support
1896 // Apply "f->do_oop" to all root oops in "this".
1897 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1898 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1899
1900 #ifndef PRODUCT
1901 private:
1902 IdealGraphPrinter *_ideal_graph_printer;
1903 public:
1904 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1905 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1906 #endif
1907
1908 // Get/set the thread's current task
1909 CompileTask* task() { return _task; }
1910 void set_task(CompileTask* task) { _task = task; }
1911
1912 // Track the nmethod currently being scanned by the sweeper
1913 void set_scanned_nmethod(nmethod* nm) {
1914 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1915 _scanned_nmethod = nm;
1916 }
1917 };
1918
1919 inline CompilerThread* CompilerThread::current() {
1920 return JavaThread::current()->as_CompilerThread();
1921 }
1922
1923
1924 // The active thread queue. It also keeps track of the current used
1925 // thread priorities.
1926 class Threads: AllStatic {
1927 friend class VMStructs;
1928 private:
1929 static JavaThread* _thread_list;
1930 static int _number_of_threads;
1931 static int _number_of_non_daemon_threads;
1932 static int _return_code;
1933 #ifdef ASSERT
1934 static bool _vm_complete;
1935 #endif
1936
1937 public:
1938 // Thread management
1939 // force_daemon is a concession to JNI, where we may need to add a
1940 // thread to the thread list before allocating its thread object
1941 static void add(JavaThread* p, bool force_daemon = false);
1942 static void remove(JavaThread* p);
1943 static bool includes(JavaThread* p);
1944 static JavaThread* first() { return _thread_list; }
1945 static void threads_do(ThreadClosure* tc);
1946
1947 // Initializes the vm and creates the vm thread
1948 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1949 static void convert_vm_init_libraries_to_agents();
1950 static void create_vm_init_libraries();
1951 static void create_vm_init_agents();
1952 static void shutdown_vm_agents();
1953 static bool destroy_vm();
1954 // Supported VM versions via JNI
1955 // Includes JNI_VERSION_1_1
1956 static jboolean is_supported_jni_version_including_1_1(jint version);
1957 // Does not include JNI_VERSION_1_1
1958 static jboolean is_supported_jni_version(jint version);
1959
1960 // Garbage collection
1961 static void follow_other_roots(void f(oop*));
1962
1963 // Apply "f->do_oop" to all root oops in all threads.
1964 // This version may only be called by sequential code.
1965 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1966 // This version may be called by sequential or parallel code.
1967 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1968 // This creates a list of GCTasks, one per thread.
1969 static void create_thread_roots_tasks(GCTaskQueue* q);
1970 // This creates a list of GCTasks, one per thread, for marking objects.
1971 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1972
1973 // Apply "f->do_oop" to roots in all threads that
1974 // are part of compiled frames
1975 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1976
1977 static void convert_hcode_pointers();
1978 static void restore_hcode_pointers();
1979
1980 // Sweeper
1981 static void nmethods_do(CodeBlobClosure* cf);
1982
1983 // RedefineClasses support
1984 static void metadata_do(void f(Metadata*));
1985
1986 static void gc_epilogue();
1987 static void gc_prologue();
1988 #ifdef ASSERT
1989 static bool is_vm_complete() { return _vm_complete; }
1990 #endif
1991
1992 // Verification
1993 static void verify();
1994 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1995 static void print(bool print_stacks, bool internal_format) {
1996 // this function is only used by debug.cpp
1997 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1998 }
1999 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2000
2001 // Get Java threads that are waiting to enter a monitor. If doLock
2002 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2003 // VM needs to be at a safepoint.
2004 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2005 address monitor, bool doLock);
2006
2007 // Get owning Java thread from the monitor's owner field. If doLock
2008 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2009 // VM needs to be at a safepoint.
2010 static JavaThread *owning_thread_from_monitor_owner(address owner,
2011 bool doLock);
2012
2013 // Number of threads on the active threads list
2014 static int number_of_threads() { return _number_of_threads; }
2015 // Number of non-daemon threads on the active threads list
2016 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2017
2018 // Deoptimizes all frames tied to marked nmethods
2019 static void deoptimized_wrt_marked_nmethods();
2020
2021 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2022
2023 };
2024
2025
2026 // Thread iterator
2027 class ThreadClosure: public StackObj {
2028 public:
2029 virtual void do_thread(Thread* thread) = 0;
2030 };
2031
2032 class SignalHandlerMark: public StackObj {
2033 private:
2034 Thread* _thread;
2035 public:
2036 SignalHandlerMark(Thread* t) {
2037 _thread = t;
2038 if (_thread) _thread->enter_signal_handler();
2039 }
2040 ~SignalHandlerMark() {
2041 if (_thread) _thread->leave_signal_handler();
2042 _thread = NULL;
2043 }
2044 };
2045
2046
2047 #endif // SHARE_VM_RUNTIME_THREAD_HPP