1 /*
2 * Copyright (c) 1997, 2016, 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 "gc/shared/threadLocalAllocBuffer.hpp"
29 #include "memory/allocation.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 #if INCLUDE_ALL_GCS
50 #include "gc/g1/dirtyCardQueue.hpp"
51 #include "gc/g1/satbMarkQueue.hpp"
52 #endif // INCLUDE_ALL_GCS
53 #ifdef ZERO
54 # include "stack_zero.hpp"
55 #endif
56
57 class ThreadSafepointState;
58 class ThreadProfiler;
59
60 class JvmtiThreadState;
61 class JvmtiGetLoadedClassesClosure;
62 class ThreadStatistics;
63 class ConcurrentLocksDump;
64 class ParkEvent;
65 class Parker;
66
67 class ciEnv;
68 class CompileThread;
69 class CompileLog;
70 class CompileTask;
71 class CompileQueue;
72 class CompilerCounters;
73 class vframeArray;
74
75 class DeoptResourceMark;
76 class jvmtiDeferredLocalVariableSet;
77
78 class GCTaskQueue;
79 class ThreadClosure;
80 class IdealGraphPrinter;
81
82 class Metadata;
83 template <class T, MEMFLAGS F> class ChunkedList;
84 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
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 // - various subclasses eg CompilerThread, ServiceThread
100 // - WatcherThread
101
102 class Thread: public ThreadShadow {
103 friend class VMStructs;
104 friend class JVMCIVMStructs;
105 private:
106
107 #ifndef USE_LIBRARY_BASED_TLS_ONLY
108 // Current thread is maintained as a thread-local variable
109 static THREAD_LOCAL_DECL Thread* _thr_current;
110 #endif
111
112 // Exception handling
113 // (Note: _pending_exception and friends are in ThreadShadow)
114 //oop _pending_exception; // pending exception for current thread
115 // const char* _exception_file; // file information for exception (debugging only)
116 // int _exception_line; // line information for exception (debugging only)
117 protected:
118 // Support for forcing alignment of thread objects for biased locking
119 void* _real_malloc_address;
120 public:
121 void* operator new(size_t size) throw() { return allocate(size, true); }
122 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
123 return allocate(size, false); }
124 void operator delete(void* p);
125
126 protected:
127 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
128 private:
129
130 // ***************************************************************
131 // Suspend and resume support
132 // ***************************************************************
133 //
134 // VM suspend/resume no longer exists - it was once used for various
135 // things including safepoints but was deprecated and finally removed
136 // in Java 7. Because VM suspension was considered "internal" Java-level
137 // suspension was considered "external", and this legacy naming scheme
138 // remains.
139 //
140 // External suspend/resume requests come from JVM_SuspendThread,
141 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
142 // ResumeThread. External
143 // suspend requests cause _external_suspend to be set and external
144 // resume requests cause _external_suspend to be cleared.
145 // External suspend requests do not nest on top of other external
146 // suspend requests. The higher level APIs reject suspend requests
147 // for already suspended threads.
148 //
149 // The external_suspend
150 // flag is checked by has_special_runtime_exit_condition() and java thread
151 // will self-suspend when handle_special_runtime_exit_condition() is
152 // called. Most uses of the _thread_blocked state in JavaThreads are
153 // considered the same as being externally suspended; if the blocking
154 // condition lifts, the JavaThread will self-suspend. Other places
155 // where VM checks for external_suspend include:
156 // + mutex granting (do not enter monitors when thread is suspended)
157 // + state transitions from _thread_in_native
158 //
159 // In general, java_suspend() does not wait for an external suspend
160 // request to complete. When it returns, the only guarantee is that
161 // the _external_suspend field is true.
162 //
163 // wait_for_ext_suspend_completion() is used to wait for an external
164 // suspend request to complete. External suspend requests are usually
165 // followed by some other interface call that requires the thread to
166 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
167 // the interface that requires quiescence, we give the JavaThread a
168 // chance to self-suspend before we need it to be quiescent. This
169 // improves overall suspend/query performance.
170 //
171 // _suspend_flags controls the behavior of java_ suspend/resume.
172 // It must be set under the protection of SR_lock. Read from the flag is
173 // OK without SR_lock as long as the value is only used as a hint.
174 // (e.g., check _external_suspend first without lock and then recheck
175 // inside SR_lock and finish the suspension)
176 //
177 // _suspend_flags is also overloaded for other "special conditions" so
178 // that a single check indicates whether any special action is needed
179 // eg. for async exceptions.
180 // -------------------------------------------------------------------
181 // Notes:
182 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
183 // but we still update its value to keep other part of the system (mainly
184 // JVMTI) happy. ThreadState is legacy code (see notes in
185 // osThread.hpp).
186 //
187 // 2. It would be more natural if set_external_suspend() is private and
188 // part of java_suspend(), but that probably would affect the suspend/query
189 // performance. Need more investigation on this.
190
191 // suspend/resume lock: used for self-suspend
192 Monitor* _SR_lock;
193
194 protected:
195 enum SuspendFlags {
196 // NOTE: avoid using the sign-bit as cc generates different test code
197 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
198
199 _external_suspend = 0x20000000U, // thread is asked to self suspend
200 _ext_suspended = 0x40000000U, // thread has self-suspended
201 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
202
203 _has_async_exception = 0x00000001U, // there is a pending async exception
204 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
205 };
206
207 // various suspension related flags - atomically updated
208 // overloaded for async exception checking in check_special_condition_for_native_trans.
209 volatile uint32_t _suspend_flags;
210
211 private:
212 int _num_nested_signal;
213
214 DEBUG_ONLY(bool _suspendible_thread;)
215
216 public:
217 void enter_signal_handler() { _num_nested_signal++; }
218 void leave_signal_handler() { _num_nested_signal--; }
219 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
220
221 #ifdef ASSERT
222 void set_suspendible_thread() {
223 _suspendible_thread = true;
224 }
225
226 void clear_suspendible_thread() {
227 _suspendible_thread = false;
228 }
229
230 bool is_suspendible_thread() { return _suspendible_thread; }
231 #endif
232
233 private:
234 // Active_handles points to a block of handles
235 JNIHandleBlock* _active_handles;
236
237 // One-element thread local free list
238 JNIHandleBlock* _free_handle_block;
239
240 // Point to the last handle mark
241 HandleMark* _last_handle_mark;
242
243 // The parity of the last strong_roots iteration in which this thread was
244 // claimed as a task.
245 jint _oops_do_parity;
246
247 public:
248 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
249 HandleMark* last_handle_mark() const { return _last_handle_mark; }
250 private:
251
252 // debug support for checking if code does allow safepoints or not
253 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
254 // mutex, or blocking on an object synchronizer (Java locking).
255 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
256 // If !allow_allocation(), then an assertion failure will happen during allocation
257 // (Hence, !allow_safepoint() => !allow_allocation()).
258 //
259 // The two classes NoSafepointVerifier and No_Allocation_Verifier are used to set these counters.
260 //
261 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
262 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
263
264 // Used by SkipGCALot class.
265 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
266
267 friend class NoAllocVerifier;
268 friend class NoSafepointVerifier;
269 friend class PauseNoSafepointVerifier;
270 friend class GCLocker;
271
272 ThreadLocalAllocBuffer _tlab; // Thread-local eden
273 jlong _allocated_bytes; // Cumulative number of bytes allocated on
274 // the Java heap
275
276 mutable 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 // Manage Thread::current()
317 void initialize_thread_current();
318 void clear_thread_current(); // TLS cleanup needed before threads terminate
319
320 public:
321 // thread entry point
322 virtual void run();
323
324 // Testers
325 virtual bool is_VM_thread() const { return false; }
326 virtual bool is_Java_thread() const { return false; }
327 virtual bool is_Compiler_thread() const { return false; }
328 virtual bool is_Code_cache_sweeper_thread() const { return false; }
329 virtual bool is_hidden_from_external_view() const { return false; }
330 virtual bool is_jvmti_agent_thread() const { return false; }
331 // True iff the thread can perform GC operations at a safepoint.
332 // Generally will be true only of VM thread and parallel GC WorkGang
333 // threads.
334 virtual bool is_GC_task_thread() const { return false; }
335 virtual bool is_Watcher_thread() const { return false; }
336 virtual bool is_ConcurrentGC_thread() const { return false; }
337 virtual bool is_Named_thread() const { return false; }
338 virtual bool is_Worker_thread() const { return false; }
339
340 // Can this thread make Java upcalls
341 virtual bool can_call_java() const { return false; }
342
343 // Casts
344 virtual WorkerThread* as_Worker_thread() const { return NULL; }
345
346 virtual char* name() const { return (char*)"Unknown thread"; }
347
348 // Returns the current thread (ASSERTS if NULL)
349 static inline Thread* current();
350 // Returns the current thread, or NULL if not attached
351 static inline Thread* current_or_null();
352 // Returns the current thread, or NULL if not attached, and is
353 // safe for use from signal-handlers
354 static inline Thread* current_or_null_safe();
355
356 // Common thread operations
357 static void set_priority(Thread* thread, ThreadPriority priority);
358 static ThreadPriority get_priority(const Thread* const thread);
359 static void start(Thread* thread);
360 static void interrupt(Thread* thr);
361 static bool is_interrupted(Thread* thr, bool clear_interrupted);
362
363 void set_native_thread_name(const char *name) {
364 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
365 os::set_native_thread_name(name);
366 }
367
368 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
369 Monitor* SR_lock() const { return _SR_lock; }
370
371 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
372
373 inline void set_suspend_flag(SuspendFlags f);
374 inline void clear_suspend_flag(SuspendFlags f);
375
376 inline void set_has_async_exception();
377 inline void clear_has_async_exception();
378
379 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
380
381 inline void set_critical_native_unlock();
382 inline void clear_critical_native_unlock();
383
384 // Support for Unhandled Oop detection
385 // Add the field for both, fastdebug and debug, builds to keep
386 // Thread's fields layout the same.
387 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build.
388 #ifdef CHECK_UNHANDLED_OOPS
389 private:
390 UnhandledOops* _unhandled_oops;
391 #elif defined(ASSERT)
392 private:
393 void* _unhandled_oops;
394 #endif
395 #ifdef CHECK_UNHANDLED_OOPS
396 public:
397 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
398 // Mark oop safe for gc. It may be stack allocated but won't move.
399 void allow_unhandled_oop(oop *op) {
400 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
401 }
402 // Clear oops at safepoint so crashes point to unhandled oop violator
403 void clear_unhandled_oops() {
404 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
405 }
406 #endif // CHECK_UNHANDLED_OOPS
407
408 public:
409 #ifndef PRODUCT
410 bool skip_gcalot() { return _skip_gcalot; }
411 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
412 #endif
413
414 // Installs a pending exception to be inserted later
415 static void send_async_exception(oop thread_oop, oop java_throwable);
416
417 // Resource area
418 ResourceArea* resource_area() const { return _resource_area; }
419 void set_resource_area(ResourceArea* area) { _resource_area = area; }
420
421 OSThread* osthread() const { return _osthread; }
422 void set_osthread(OSThread* thread) { _osthread = thread; }
423
424 // JNI handle support
425 JNIHandleBlock* active_handles() const { return _active_handles; }
426 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
427 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
428 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
429
430 // Internal handle support
431 HandleArea* handle_area() const { return _handle_area; }
432 void set_handle_area(HandleArea* area) { _handle_area = area; }
433
434 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
435 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
436
437 // Thread-Local Allocation Buffer (TLAB) support
438 ThreadLocalAllocBuffer& tlab() { return _tlab; }
439 void initialize_tlab() {
440 if (UseTLAB) {
441 tlab().initialize();
442 }
443 }
444
445 jlong allocated_bytes() { return _allocated_bytes; }
446 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
447 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
448 inline jlong cooked_allocated_bytes();
449
450 TRACE_DEFINE_THREAD_TRACE_DATA_OFFSET;
451 TRACE_DATA* trace_data() const { return &_trace_data; }
452
453 const ThreadExt& ext() const { return _ext; }
454 ThreadExt& ext() { return _ext; }
455
456 // VM operation support
457 int vm_operation_ticket() { return ++_vm_operation_started_count; }
458 int vm_operation_completed_count() { return _vm_operation_completed_count; }
459 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
460
461 // For tracking the heavyweight monitor the thread is pending on.
462 ObjectMonitor* current_pending_monitor() {
463 return _current_pending_monitor;
464 }
465 void set_current_pending_monitor(ObjectMonitor* monitor) {
466 _current_pending_monitor = monitor;
467 }
468 void set_current_pending_monitor_is_from_java(bool from_java) {
469 _current_pending_monitor_is_from_java = from_java;
470 }
471 bool current_pending_monitor_is_from_java() {
472 return _current_pending_monitor_is_from_java;
473 }
474
475 // For tracking the ObjectMonitor on which this thread called Object.wait()
476 ObjectMonitor* current_waiting_monitor() {
477 return _current_waiting_monitor;
478 }
479 void set_current_waiting_monitor(ObjectMonitor* monitor) {
480 _current_waiting_monitor = monitor;
481 }
482
483 // GC support
484 // Apply "f->do_oop" to all root oops in "this".
485 // Used by JavaThread::oops_do.
486 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
487 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf);
488
489 // Handles the parallel case for the method below.
490 private:
491 bool claim_oops_do_par_case(int collection_parity);
492 public:
493 // Requires that "collection_parity" is that of the current roots
494 // iteration. If "is_par" is false, sets the parity of "this" to
495 // "collection_parity", and returns "true". If "is_par" is true,
496 // uses an atomic instruction to set the current threads parity to
497 // "collection_parity", if it is not already. Returns "true" iff the
498 // calling thread does the update, this indicates that the calling thread
499 // has claimed the thread's stack as a root groop in the current
500 // collection.
501 bool claim_oops_do(bool is_par, int collection_parity) {
502 if (!is_par) {
503 _oops_do_parity = collection_parity;
504 return true;
505 } else {
506 return claim_oops_do_par_case(collection_parity);
507 }
508 }
509
510 // jvmtiRedefineClasses support
511 void metadata_handles_do(void f(Metadata*));
512
513 // Used by fast lock support
514 virtual bool is_lock_owned(address adr) const;
515
516 // Check if address is in the stack of the thread (not just for locks).
517 // Warning: the method can only be used on the running thread
518 bool is_in_stack(address adr) const;
519 // Check if address is in the usable part of the stack (excludes protected
520 // guard pages)
521 bool is_in_usable_stack(address adr) const;
522
523 // Sets this thread as starting thread. Returns failure if thread
524 // creation fails due to lack of memory, too many threads etc.
525 bool set_as_starting_thread();
526
527 protected:
528 // OS data associated with the thread
529 OSThread* _osthread; // Platform-specific thread information
530
531 // Thread local resource area for temporary allocation within the VM
532 ResourceArea* _resource_area;
533
534 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
535
536 // Thread local handle area for allocation of handles within the VM
537 HandleArea* _handle_area;
538 GrowableArray<Metadata*>* _metadata_handles;
539
540 // Support for stack overflow handling, get_thread, etc.
541 address _stack_base;
542 size_t _stack_size;
543 uintptr_t _self_raw_id; // used by get_thread (mutable)
544 int _lgrp_id;
545
546 public:
547 // Stack overflow support
548 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
549 void set_stack_base(address base) { _stack_base = base; }
550 size_t stack_size() const { return _stack_size; }
551 void set_stack_size(size_t size) { _stack_size = size; }
552 address stack_end() const { return stack_base() - stack_size(); }
553 void record_stack_base_and_size();
554
555 bool on_local_stack(address adr) const {
556 // QQQ this has knowledge of direction, ought to be a stack method
557 return (_stack_base >= adr && adr >= stack_end());
558 }
559
560 uintptr_t self_raw_id() { return _self_raw_id; }
561 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
562
563 int lgrp_id() const { return _lgrp_id; }
564 void set_lgrp_id(int value) { _lgrp_id = value; }
565
566 // Printing
567 virtual void print_on(outputStream* st) const;
568 void print() const { print_on(tty); }
569 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
570
571 // Debug-only code
572 #ifdef ASSERT
573 private:
574 // Deadlock detection support for Mutex locks. List of locks own by thread.
575 Monitor* _owned_locks;
576 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
577 // thus the friendship
578 friend class Mutex;
579 friend class Monitor;
580
581 public:
582 void print_owned_locks_on(outputStream* st) const;
583 void print_owned_locks() const { print_owned_locks_on(tty); }
584 Monitor* owned_locks() const { return _owned_locks; }
585 bool owns_locks() const { return owned_locks() != NULL; }
586 bool owns_locks_but_compiled_lock() const;
587 int oops_do_parity() const { return _oops_do_parity; }
588
589 // Deadlock detection
590 bool allow_allocation() { return _allow_allocation_count == 0; }
591 ResourceMark* current_resource_mark() { return _current_resource_mark; }
592 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
593 #endif
594
595 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
596
597 private:
598 volatile int _jvmti_env_iteration_count;
599
600 public:
601 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
602 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
603 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
604
605 // Code generation
606 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
607 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
608 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
609
610 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
611 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
612
613 #define TLAB_FIELD_OFFSET(name) \
614 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
615
616 TLAB_FIELD_OFFSET(start)
617 TLAB_FIELD_OFFSET(end)
618 TLAB_FIELD_OFFSET(top)
619 TLAB_FIELD_OFFSET(pf_top)
620 TLAB_FIELD_OFFSET(size) // desired_size
621 TLAB_FIELD_OFFSET(refill_waste_limit)
622 TLAB_FIELD_OFFSET(number_of_refills)
623 TLAB_FIELD_OFFSET(fast_refill_waste)
624 TLAB_FIELD_OFFSET(slow_allocations)
625
626 #undef TLAB_FIELD_OFFSET
627
628 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
629
630 public:
631 volatile intptr_t _Stalled;
632 volatile int _TypeTag;
633 ParkEvent * _ParkEvent; // for synchronized()
634 ParkEvent * _SleepEvent; // for Thread.sleep
635 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
636 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
637 int NativeSyncRecursion; // diagnostic
638
639 volatile int _OnTrap; // Resume-at IP delta
640 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
641 jint _hashStateX; // thread-specific hashCode generator state
642 jint _hashStateY;
643 jint _hashStateZ;
644 void * _schedctl;
645
646
647 volatile jint rng[4]; // RNG for spin loop
648
649 // Low-level leaf-lock primitives used to implement synchronization
650 // and native monitor-mutex infrastructure.
651 // Not for general synchronization use.
652 static void SpinAcquire(volatile int * Lock, const char * Name);
653 static void SpinRelease(volatile int * Lock);
654 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
655 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
656 static void muxRelease(volatile intptr_t * Lock);
657 };
658
659 // Inline implementation of Thread::current()
660 inline Thread* Thread::current() {
661 Thread* current = current_or_null();
662 assert(current != NULL, "Thread::current() called on detached thread");
663 return current;
664 }
665
666 inline Thread* Thread::current_or_null() {
667 #ifndef USE_LIBRARY_BASED_TLS_ONLY
668 return _thr_current;
669 #else
670 return ThreadLocalStorage::thread();
671 #endif
672 }
673
674 inline Thread* Thread::current_or_null_safe() {
675 return ThreadLocalStorage::thread();
676 }
677
678 // Name support for threads. non-JavaThread subclasses with multiple
679 // uniquely named instances should derive from this.
680 class NamedThread: public Thread {
681 friend class VMStructs;
682 enum {
683 max_name_len = 64
684 };
685 private:
686 char* _name;
687 // log JavaThread being processed by oops_do
688 JavaThread* _processed_thread;
689 uint _gc_id; // The current GC id when a thread takes part in GC
690
691 public:
692 NamedThread();
693 ~NamedThread();
694 // May only be called once per thread.
695 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
696 void initialize_named_thread();
697 virtual bool is_Named_thread() const { return true; }
698 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
699 JavaThread *processed_thread() { return _processed_thread; }
700 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
701 virtual void print_on(outputStream* st) const;
702
703 void set_gc_id(uint gc_id) { _gc_id = gc_id; }
704 uint gc_id() { return _gc_id; }
705 };
706
707 // Worker threads are named and have an id of an assigned work.
708 class WorkerThread: public NamedThread {
709 private:
710 uint _id;
711 public:
712 WorkerThread() : _id(0) { }
713 virtual bool is_Worker_thread() const { return true; }
714
715 virtual WorkerThread* as_Worker_thread() const {
716 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
717 return (WorkerThread*) this;
718 }
719
720 void set_id(uint work_id) { _id = work_id; }
721 uint id() const { return _id; }
722 };
723
724 // A single WatcherThread is used for simulating timer interrupts.
725 class WatcherThread: public Thread {
726 friend class VMStructs;
727 public:
728 virtual void run();
729
730 private:
731 static WatcherThread* _watcher_thread;
732
733 static bool _startable;
734 // volatile due to at least one lock-free read
735 volatile static bool _should_terminate;
736
737 os::WatcherThreadCrashProtection* _crash_protection;
738 public:
739 enum SomeConstants {
740 delay_interval = 10 // interrupt delay in milliseconds
741 };
742
743 // Constructor
744 WatcherThread();
745
746 // No destruction allowed
747 ~WatcherThread() {
748 guarantee(false, "WatcherThread deletion must fix the race with VM termination");
749 }
750
751 // Tester
752 bool is_Watcher_thread() const { return true; }
753
754 // Printing
755 char* name() const { return (char*)"VM Periodic Task Thread"; }
756 void print_on(outputStream* st) const;
757 void unpark();
758
759 // Returns the single instance of WatcherThread
760 static WatcherThread* watcher_thread() { return _watcher_thread; }
761
762 // Create and start the single instance of WatcherThread, or stop it on shutdown
763 static void start();
764 static void stop();
765 // Only allow start once the VM is sufficiently initialized
766 // Otherwise the first task to enroll will trigger the start
767 static void make_startable();
768
769 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
770 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
771 _crash_protection = crash_protection;
772 }
773
774 bool has_crash_protection() const { return _crash_protection != NULL; }
775 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
776
777 private:
778 int sleep() const;
779 };
780
781
782 class CompilerThread;
783
784 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
785
786 class JavaThread: public Thread {
787 friend class VMStructs;
788 friend class JVMCIVMStructs;
789 friend class WhiteBox;
790 private:
791 JavaThread* _next; // The next thread in the Threads list
792 oop _threadObj; // The Java level thread object
793
794 #ifdef ASSERT
795 private:
796 int _java_call_counter;
797
798 public:
799 int java_call_counter() { return _java_call_counter; }
800 void inc_java_call_counter() { _java_call_counter++; }
801 void dec_java_call_counter() {
802 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
803 _java_call_counter--;
804 }
805 private: // restore original namespace restriction
806 #endif // ifdef ASSERT
807
808 #ifndef PRODUCT
809 public:
810 enum {
811 jump_ring_buffer_size = 16
812 };
813 private: // restore original namespace restriction
814 #endif
815
816 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
817
818 ThreadFunction _entry_point;
819
820 JNIEnv _jni_environment;
821
822 // Deopt support
823 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
824
825 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
826 // transition out of native
827 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized
828 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
829 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
830 // Because deoptimization is lazy we must save jvmti requests to set locals
831 // in compiled frames until we deoptimize and we have an interpreter frame.
832 // This holds the pointer to array (yeah like there might be more than one) of
833 // description of compiled vframes that have locals that need to be updated.
834 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
835
836 // Handshake value for fixing 6243940. We need a place for the i2c
837 // adapter to store the callee Method*. This value is NEVER live
838 // across a gc point so it does NOT have to be gc'd
839 // The handshake is open ended since we can't be certain that it will
840 // be NULLed. This is because we rarely ever see the race and end up
841 // in handle_wrong_method which is the backend of the handshake. See
842 // code in i2c adapters and handle_wrong_method.
843
844 Method* _callee_target;
845
846 // Used to pass back results to the interpreter or generated code running Java code.
847 oop _vm_result; // oop result is GC-preserved
848 Metadata* _vm_result_2; // non-oop result
849
850 // See ReduceInitialCardMarks: this holds the precise space interval of
851 // the most recent slow path allocation for which compiled code has
852 // elided card-marks for performance along the fast-path.
853 MemRegion _deferred_card_mark;
854
855 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
856 // allocated during deoptimization
857 // and by JNI_MonitorEnter/Exit
858
859 // Async. requests support
860 enum AsyncRequests {
861 _no_async_condition = 0,
862 _async_exception,
863 _async_unsafe_access_error
864 };
865 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
866 oop _pending_async_exception;
867
868 // Safepoint support
869 public: // Expose _thread_state for SafeFetchInt()
870 volatile JavaThreadState _thread_state;
871 private:
872 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
873 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
874
875 // JavaThread termination support
876 enum TerminatedTypes {
877 _not_terminated = 0xDEAD - 2,
878 _thread_exiting, // JavaThread::exit() has been called for this thread
879 _thread_terminated, // JavaThread is removed from thread list
880 _vm_exited // JavaThread is still executing native code, but VM is terminated
881 // only VM_Exit can set _vm_exited
882 };
883
884 // In general a JavaThread's _terminated field transitions as follows:
885 //
886 // _not_terminated => _thread_exiting => _thread_terminated
887 //
888 // _vm_exited is a special value to cover the case of a JavaThread
889 // executing native code after the VM itself is terminated.
890 volatile TerminatedTypes _terminated;
891 // suspend/resume support
892 volatile bool _suspend_equivalent; // Suspend equivalent condition
893 jint _in_deopt_handler; // count of deoptimization
894 // handlers thread is in
895 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
896 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
897 // never locked) when throwing an exception. Used by interpreter only.
898
899 // JNI attach states:
900 enum JNIAttachStates {
901 _not_attaching_via_jni = 1, // thread is not attaching via JNI
902 _attaching_via_jni, // thread is attaching via JNI
903 _attached_via_jni // thread has attached via JNI
904 };
905
906 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
907 // A native thread that is attaching via JNI starts with a value
908 // of _attaching_via_jni and transitions to _attached_via_jni.
909 volatile JNIAttachStates _jni_attach_state;
910
911 public:
912 // State of the stack guard pages for this thread.
913 enum StackGuardState {
914 stack_guard_unused, // not needed
915 stack_guard_reserved_disabled,
916 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow
917 stack_guard_enabled // enabled
918 };
919
920 private:
921
922 #if INCLUDE_JVMCI
923 // The _pending_* fields below are used to communicate extra information
924 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
925
926 // Communicates the DeoptReason and DeoptAction of the uncommon trap
927 int _pending_deoptimization;
928
929 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
930 // before the monitor has been acquired.
931 bool _pending_monitorenter;
932
933 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
934 bool _pending_transfer_to_interpreter;
935
936 // Guard for re-entrant call to JVMCIRuntime::adjust_comp_level
937 bool _adjusting_comp_level;
938
939 // An object that JVMCI compiled code can use to further describe and
940 // uniquely identify the speculative optimization guarded by the uncommon trap
941 oop _pending_failed_speculation;
942
943 // These fields are mutually exclusive in terms of live ranges.
944 union {
945 // Communicates the pc at which the most recent implicit exception occurred
946 // from the signal handler to a deoptimization stub.
947 address _implicit_exception_pc;
948
949 // Communicates an alternative call target to an i2c stub from a JavaCall .
950 address _alternate_call_target;
951 } _jvmci;
952
953 // Support for high precision, thread sensitive counters in JVMCI compiled code.
954 jlong* _jvmci_counters;
955
956 public:
957 static jlong* _jvmci_old_thread_counters;
958 static void collect_counters(typeArrayOop array);
959 private:
960 #endif // INCLUDE_JVMCI
961
962 StackGuardState _stack_guard_state;
963
964 // Precompute the limit of the stack as used in stack overflow checks.
965 // We load it from here to simplify the stack overflow check in assembly.
966 address _stack_overflow_limit;
967 address _reserved_stack_activation;
968
969 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
970 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
971 // code)
972 volatile oop _exception_oop; // Exception thrown in compiled code
973 volatile address _exception_pc; // PC where exception happened
974 volatile address _exception_handler_pc; // PC for handler of exception
975 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
976
977 private:
978 // support for JNI critical regions
979 jint _jni_active_critical; // count of entries into JNI critical region
980
981 // Checked JNI: function name requires exception check
982 char* _pending_jni_exception_check_fn;
983
984 // For deadlock detection.
985 int _depth_first_number;
986
987 // JVMTI PopFrame support
988 // This is set to popframe_pending to signal that top Java frame should be popped immediately
989 int _popframe_condition;
990
991 // If reallocation of scalar replaced objects fails, we throw OOM
992 // and during exception propagation, pop the top
993 // _frames_to_pop_failed_realloc frames, the ones that reference
994 // failed reallocations.
995 int _frames_to_pop_failed_realloc;
996
997 #ifndef PRODUCT
998 int _jmp_ring_index;
999 struct {
1000 // We use intptr_t instead of address so debugger doesn't try and display strings
1001 intptr_t _target;
1002 intptr_t _instruction;
1003 const char* _file;
1004 int _line;
1005 } _jmp_ring[jump_ring_buffer_size];
1006 #endif // PRODUCT
1007
1008 #if INCLUDE_ALL_GCS
1009 // Support for G1 barriers
1010 private:
1011 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier.
1012 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
1013
1014 public:
1015 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; }
1016 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1017 #endif // INCLUDE_ALL_GCS
1018
1019 friend class VMThread;
1020 friend class ThreadWaitTransition;
1021 friend class VM_Exit;
1022
1023 void initialize(); // Initialized the instance variables
1024
1025 public:
1026 // Constructor
1027 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1028 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1029 ~JavaThread();
1030
1031 #ifdef ASSERT
1032 // verify this JavaThread hasn't be published in the Threads::list yet
1033 void verify_not_published();
1034 #endif
1035
1036 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1037 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1038 _jni_environment.functions = functionTable;
1039 }
1040 struct JNINativeInterface_* get_jni_functions() {
1041 return (struct JNINativeInterface_ *)_jni_environment.functions;
1042 }
1043
1044 // This function is called at thread creation to allow
1045 // platform specific thread variables to be initialized.
1046 void cache_global_variables();
1047
1048 // Executes Shutdown.shutdown()
1049 void invoke_shutdown_hooks();
1050
1051 // Cleanup on thread exit
1052 enum ExitType {
1053 normal_exit,
1054 jni_detach
1055 };
1056 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1057
1058 void cleanup_failed_attach_current_thread();
1059
1060 // Testers
1061 virtual bool is_Java_thread() const { return true; }
1062 virtual bool can_call_java() const { return true; }
1063
1064 // Thread chain operations
1065 JavaThread* next() const { return _next; }
1066 void set_next(JavaThread* p) { _next = p; }
1067
1068 // Thread oop. threadObj() can be NULL for initial JavaThread
1069 // (or for threads attached via JNI)
1070 oop threadObj() const { return _threadObj; }
1071 void set_threadObj(oop p) { _threadObj = p; }
1072
1073 ThreadPriority java_priority() const; // Read from threadObj()
1074
1075 // Prepare thread and add to priority queue. If a priority is
1076 // not specified, use the priority of the thread object. Threads_lock
1077 // must be held while this function is called.
1078 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1079 void prepare_ext();
1080
1081 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1082 address saved_exception_pc() { return _saved_exception_pc; }
1083
1084
1085 ThreadFunction entry_point() const { return _entry_point; }
1086
1087 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1088 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1089
1090 // Last frame anchor routines
1091
1092 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1093
1094 // last_Java_sp
1095 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1096 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1097
1098 // last_Java_pc
1099
1100 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1101
1102 // Safepoint support
1103 #if !(defined(PPC64) || defined(AARCH64))
1104 JavaThreadState thread_state() const { return _thread_state; }
1105 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1106 #else
1107 // Use membars when accessing volatile _thread_state. See
1108 // Threads::create_vm() for size checks.
1109 inline JavaThreadState thread_state() const;
1110 inline void set_thread_state(JavaThreadState s);
1111 #endif
1112 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1113 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1114 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1115
1116 // thread has called JavaThread::exit() or is terminated
1117 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1118 // thread is terminated (no longer on the threads list); we compare
1119 // against the two non-terminated values so that a freed JavaThread
1120 // will also be considered terminated.
1121 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1122 void set_terminated(TerminatedTypes t) { _terminated = t; }
1123 // special for Threads::remove() which is static:
1124 void set_terminated_value() { _terminated = _thread_terminated; }
1125 void block_if_vm_exited();
1126
1127 bool doing_unsafe_access() { return _doing_unsafe_access; }
1128 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1129
1130 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1131 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1132
1133 // Suspend/resume support for JavaThread
1134 private:
1135 inline void set_ext_suspended();
1136 inline void clear_ext_suspended();
1137
1138 public:
1139 void java_suspend();
1140 void java_resume();
1141 int java_suspend_self();
1142
1143 void check_and_wait_while_suspended() {
1144 assert(JavaThread::current() == this, "sanity check");
1145
1146 bool do_self_suspend;
1147 do {
1148 // were we externally suspended while we were waiting?
1149 do_self_suspend = handle_special_suspend_equivalent_condition();
1150 if (do_self_suspend) {
1151 // don't surprise the thread that suspended us by returning
1152 java_suspend_self();
1153 set_suspend_equivalent();
1154 }
1155 } while (do_self_suspend);
1156 }
1157 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1158 // Check for async exception in addition to safepoint and suspend request.
1159 static void check_special_condition_for_native_trans(JavaThread *thread);
1160
1161 // Same as check_special_condition_for_native_trans but finishes the
1162 // transition into thread_in_Java mode so that it can potentially
1163 // block.
1164 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1165
1166 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1167 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1168 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1169 // Warning: is_ext_suspend_completed() may temporarily drop the
1170 // SR_lock to allow the thread to reach a stable thread state if
1171 // it is currently in a transient thread state.
1172 return is_ext_suspend_completed(false /* !called_by_wait */,
1173 SuspendRetryDelay, bits);
1174 }
1175
1176 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1177 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1178 // passed as the count and delay parameters. Experiments with specific
1179 // calls to wait_for_ext_suspend_completion() can be done by passing
1180 // other values in the code. Experiments with all calls can be done
1181 // via the appropriate -XX options.
1182 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1183
1184 inline void set_external_suspend();
1185 inline void clear_external_suspend();
1186
1187 inline void set_deopt_suspend();
1188 inline void clear_deopt_suspend();
1189 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1190
1191 bool is_external_suspend() const {
1192 return (_suspend_flags & _external_suspend) != 0;
1193 }
1194 // Whenever a thread transitions from native to vm/java it must suspend
1195 // if external|deopt suspend is present.
1196 bool is_suspend_after_native() const {
1197 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1198 }
1199
1200 // external suspend request is completed
1201 bool is_ext_suspended() const {
1202 return (_suspend_flags & _ext_suspended) != 0;
1203 }
1204
1205 bool is_external_suspend_with_lock() const {
1206 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1207 return is_external_suspend();
1208 }
1209
1210 // Special method to handle a pending external suspend request
1211 // when a suspend equivalent condition lifts.
1212 bool handle_special_suspend_equivalent_condition() {
1213 assert(is_suspend_equivalent(),
1214 "should only be called in a suspend equivalence condition");
1215 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1216 bool ret = is_external_suspend();
1217 if (!ret) {
1218 // not about to self-suspend so clear suspend equivalence
1219 clear_suspend_equivalent();
1220 }
1221 // implied else:
1222 // We have a pending external suspend request so we leave the
1223 // suspend_equivalent flag set until java_suspend_self() sets
1224 // the ext_suspended flag and clears the suspend_equivalent
1225 // flag. This insures that wait_for_ext_suspend_completion()
1226 // will return consistent values.
1227 return ret;
1228 }
1229
1230 // utility methods to see if we are doing some kind of suspension
1231 bool is_being_ext_suspended() const {
1232 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1233 return is_ext_suspended() || is_external_suspend();
1234 }
1235
1236 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1237
1238 void set_suspend_equivalent() { _suspend_equivalent = true; }
1239 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1240
1241 // Thread.stop support
1242 void send_thread_stop(oop throwable);
1243 AsyncRequests clear_special_runtime_exit_condition() {
1244 AsyncRequests x = _special_runtime_exit_condition;
1245 _special_runtime_exit_condition = _no_async_condition;
1246 return x;
1247 }
1248
1249 // Are any async conditions present?
1250 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1251
1252 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1253
1254 // these next two are also used for self-suspension and async exception support
1255 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1256
1257 // Return true if JavaThread has an asynchronous condition or
1258 // if external suspension is requested.
1259 bool has_special_runtime_exit_condition() {
1260 // We call is_external_suspend() last since external suspend should
1261 // be less common. Because we don't use is_external_suspend_with_lock
1262 // it is possible that we won't see an asynchronous external suspend
1263 // request that has just gotten started, i.e., SR_lock grabbed but
1264 // _external_suspend field change either not made yet or not visible
1265 // yet. However, this is okay because the request is asynchronous and
1266 // we will see the new flag value the next time through. It's also
1267 // possible that the external suspend request is dropped after
1268 // we have checked is_external_suspend(), we will recheck its value
1269 // under SR_lock in java_suspend_self().
1270 return (_special_runtime_exit_condition != _no_async_condition) ||
1271 is_external_suspend() || is_deopt_suspend();
1272 }
1273
1274 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1275
1276 inline void set_pending_async_exception(oop e);
1277
1278 // Fast-locking support
1279 bool is_lock_owned(address adr) const;
1280
1281 // Accessors for vframe array top
1282 // The linked list of vframe arrays are sorted on sp. This means when we
1283 // unpack the head must contain the vframe array to unpack.
1284 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1285 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1286
1287 // Side structure for deferring update of java frame locals until deopt occurs
1288 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1289 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1290
1291 // These only really exist to make debugging deopt problems simpler
1292
1293 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1294 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1295
1296 // The special resourceMark used during deoptimization
1297
1298 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1299 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1300
1301 intptr_t* must_deopt_id() { return _must_deopt_id; }
1302 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1303 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1304
1305 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; }
1306 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; }
1307
1308 Method* callee_target() const { return _callee_target; }
1309 void set_callee_target (Method* x) { _callee_target = x; }
1310
1311 // Oop results of vm runtime calls
1312 oop vm_result() const { return _vm_result; }
1313 void set_vm_result (oop x) { _vm_result = x; }
1314
1315 Metadata* vm_result_2() const { return _vm_result_2; }
1316 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1317
1318 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1319 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1320
1321 #if INCLUDE_JVMCI
1322 int pending_deoptimization() const { return _pending_deoptimization; }
1323 oop pending_failed_speculation() const { return _pending_failed_speculation; }
1324 bool adjusting_comp_level() const { return _adjusting_comp_level; }
1325 void set_adjusting_comp_level(bool b) { _adjusting_comp_level = b; }
1326 bool has_pending_monitorenter() const { return _pending_monitorenter; }
1327 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
1328 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
1329 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; }
1330 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
1331 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
1332 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
1333 #endif // INCLUDE_JVMCI
1334
1335 // Exception handling for compiled methods
1336 oop exception_oop() const { return _exception_oop; }
1337 address exception_pc() const { return _exception_pc; }
1338 address exception_handler_pc() const { return _exception_handler_pc; }
1339 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1340
1341 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1342 void set_exception_pc(address a) { _exception_pc = a; }
1343 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1344 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1345
1346 void clear_exception_oop_and_pc() {
1347 set_exception_oop(NULL);
1348 set_exception_pc(NULL);
1349 }
1350
1351 // Stack overflow support
1352 //
1353 // (small addresses)
1354 //
1355 // -- <-- stack_end() ---
1356 // | |
1357 // | red pages |
1358 // | |
1359 // -- <-- stack_red_zone_base() |
1360 // | |
1361 // | guard
1362 // | yellow pages zone
1363 // | |
1364 // | |
1365 // -- <-- stack_yellow_zone_base() |
1366 // | |
1367 // | |
1368 // | reserved pages |
1369 // | |
1370 // -- <-- stack_reserved_zone_base() --- ---
1371 // /|\ shadow <-- stack_overflow_limit() (somewhere in here)
1372 // | zone
1373 // \|/ size
1374 // some untouched memory ---
1375 //
1376 //
1377 // --
1378 // |
1379 // | shadow zone
1380 // |
1381 // --
1382 // x frame n
1383 // --
1384 // x frame n-1
1385 // x
1386 // --
1387 // ...
1388 //
1389 // --
1390 // x frame 0
1391 // -- <-- stack_base()
1392 //
1393 // (large addresses)
1394 //
1395
1396 private:
1397 // These values are derived from flags StackRedPages, StackYellowPages,
1398 // StackReservedPages and StackShadowPages. The zone size is determined
1399 // ergonomically if page_size > 4K.
1400 static size_t _stack_red_zone_size;
1401 static size_t _stack_yellow_zone_size;
1402 static size_t _stack_reserved_zone_size;
1403 static size_t _stack_shadow_zone_size;
1404 public:
1405 inline size_t stack_available(address cur_sp);
1406
1407 static size_t stack_red_zone_size() {
1408 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized.");
1409 return _stack_red_zone_size;
1410 }
1411 static void set_stack_red_zone_size(size_t s) {
1412 assert(is_size_aligned(s, os::vm_page_size()),
1413 "We can not protect if the red zone size is not page aligned.");
1414 assert(_stack_red_zone_size == 0, "This should be called only once.");
1415 _stack_red_zone_size = s;
1416 }
1417 address stack_red_zone_base() {
1418 return (address)(stack_end() + stack_red_zone_size());
1419 }
1420 bool in_stack_red_zone(address a) {
1421 return a <= stack_red_zone_base() && a >= stack_end();
1422 }
1423
1424 static size_t stack_yellow_zone_size() {
1425 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized.");
1426 return _stack_yellow_zone_size;
1427 }
1428 static void set_stack_yellow_zone_size(size_t s) {
1429 assert(is_size_aligned(s, os::vm_page_size()),
1430 "We can not protect if the yellow zone size is not page aligned.");
1431 assert(_stack_yellow_zone_size == 0, "This should be called only once.");
1432 _stack_yellow_zone_size = s;
1433 }
1434
1435 static size_t stack_reserved_zone_size() {
1436 // _stack_reserved_zone_size may be 0. This indicates the feature is off.
1437 return _stack_reserved_zone_size;
1438 }
1439 static void set_stack_reserved_zone_size(size_t s) {
1440 assert(is_size_aligned(s, os::vm_page_size()),
1441 "We can not protect if the reserved zone size is not page aligned.");
1442 assert(_stack_reserved_zone_size == 0, "This should be called only once.");
1443 _stack_reserved_zone_size = s;
1444 }
1445 address stack_reserved_zone_base() {
1446 return (address)(stack_end() +
1447 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size()));
1448 }
1449 bool in_stack_reserved_zone(address a) {
1450 return (a <= stack_reserved_zone_base()) &&
1451 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size()));
1452 }
1453
1454 static size_t stack_yellow_reserved_zone_size() {
1455 return _stack_yellow_zone_size + _stack_reserved_zone_size;
1456 }
1457 bool in_stack_yellow_reserved_zone(address a) {
1458 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base());
1459 }
1460
1461 // Size of red + yellow + reserved zones.
1462 static size_t stack_guard_zone_size() {
1463 return stack_red_zone_size() + stack_yellow_reserved_zone_size();
1464 }
1465
1466 static size_t stack_shadow_zone_size() {
1467 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized.");
1468 return _stack_shadow_zone_size;
1469 }
1470 static void set_stack_shadow_zone_size(size_t s) {
1471 // The shadow area is not allocated or protected, so
1472 // it needs not be page aligned.
1473 // But the stack bang currently assumes that it is a
1474 // multiple of page size. This guarantees that the bang
1475 // loop touches all pages in the shadow zone.
1476 // This can be guaranteed differently, as well. E.g., if
1477 // the page size is a multiple of 4K, banging in 4K steps
1478 // suffices to touch all pages. (Some pages are banged
1479 // several times, though.)
1480 assert(is_size_aligned(s, os::vm_page_size()),
1481 "Stack bang assumes multiple of page size.");
1482 assert(_stack_shadow_zone_size == 0, "This should be called only once.");
1483 _stack_shadow_zone_size = s;
1484 }
1485
1486 void create_stack_guard_pages();
1487 void remove_stack_guard_pages();
1488
1489 void enable_stack_reserved_zone();
1490 void disable_stack_reserved_zone();
1491 void enable_stack_yellow_reserved_zone();
1492 void disable_stack_yellow_reserved_zone();
1493 void enable_stack_red_zone();
1494 void disable_stack_red_zone();
1495
1496 inline bool stack_guard_zone_unused();
1497 inline bool stack_yellow_reserved_zone_disabled();
1498 inline bool stack_reserved_zone_disabled();
1499 inline bool stack_guards_enabled();
1500
1501 address reserved_stack_activation() const { return _reserved_stack_activation; }
1502 void set_reserved_stack_activation(address addr) {
1503 assert(_reserved_stack_activation == stack_base()
1504 || _reserved_stack_activation == NULL
1505 || addr == stack_base(), "Must not be set twice");
1506 _reserved_stack_activation = addr;
1507 }
1508
1509 // Attempt to reguard the stack after a stack overflow may have occurred.
1510 // Returns true if (a) guard pages are not needed on this thread, (b) the
1511 // pages are already guarded, or (c) the pages were successfully reguarded.
1512 // Returns false if there is not enough stack space to reguard the pages, in
1513 // which case the caller should unwind a frame and try again. The argument
1514 // should be the caller's (approximate) sp.
1515 bool reguard_stack(address cur_sp);
1516 // Similar to above but see if current stackpoint is out of the guard area
1517 // and reguard if possible.
1518 bool reguard_stack(void);
1519
1520 address stack_overflow_limit() { return _stack_overflow_limit; }
1521 void set_stack_overflow_limit() {
1522 _stack_overflow_limit =
1523 stack_end() + MAX2(JavaThread::stack_guard_zone_size(), JavaThread::stack_shadow_zone_size());
1524 }
1525
1526 // Misc. accessors/mutators
1527 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1528 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1529 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1530
1531 #ifndef PRODUCT
1532 void record_jump(address target, address instr, const char* file, int line);
1533 #endif // PRODUCT
1534
1535 // For assembly stub generation
1536 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1537 #ifndef PRODUCT
1538 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1539 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1540 #endif // PRODUCT
1541 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1542 static ByteSize pending_jni_exception_check_fn_offset() {
1543 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn);
1544 }
1545 static ByteSize last_Java_sp_offset() {
1546 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1547 }
1548 static ByteSize last_Java_pc_offset() {
1549 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1550 }
1551 static ByteSize frame_anchor_offset() {
1552 return byte_offset_of(JavaThread, _anchor);
1553 }
1554 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1555 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1556 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1557 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1558 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1559 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1560 #if INCLUDE_JVMCI
1561 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
1562 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
1563 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); }
1564 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
1565 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
1566 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
1567 #endif // INCLUDE_JVMCI
1568 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1569 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1570 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1571 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1572 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1573 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1574 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); }
1575 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1576
1577 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1578 static ByteSize should_post_on_exceptions_flag_offset() {
1579 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1580 }
1581
1582 #if INCLUDE_ALL_GCS
1583 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1584 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1585 #endif // INCLUDE_ALL_GCS
1586
1587 // Returns the jni environment for this thread
1588 JNIEnv* jni_environment() { return &_jni_environment; }
1589
1590 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1591 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1592 // Only return NULL if thread is off the thread list; starting to
1593 // exit should not return NULL.
1594 if (thread_from_jni_env->is_terminated()) {
1595 thread_from_jni_env->block_if_vm_exited();
1596 return NULL;
1597 } else {
1598 return thread_from_jni_env;
1599 }
1600 }
1601
1602 // JNI critical regions. These can nest.
1603 bool in_critical() { return _jni_active_critical > 0; }
1604 bool in_last_critical() { return _jni_active_critical == 1; }
1605 void enter_critical() {
1606 assert(Thread::current() == this ||
1607 (Thread::current()->is_VM_thread() &&
1608 SafepointSynchronize::is_synchronizing()),
1609 "this must be current thread or synchronizing");
1610 _jni_active_critical++;
1611 }
1612 void exit_critical() {
1613 assert(Thread::current() == this, "this must be current thread");
1614 _jni_active_critical--;
1615 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1616 }
1617
1618 // Checked JNI: is the programmer required to check for exceptions, if so specify
1619 // which function name. Returning to a Java frame should implicitly clear the
1620 // pending check, this is done for Native->Java transitions (i.e. user JNI code).
1621 // VM->Java transistions are not cleared, it is expected that JNI code enclosed
1622 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal).
1623 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1624 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1625 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1626 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1627
1628 // For deadlock detection
1629 int depth_first_number() { return _depth_first_number; }
1630 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1631
1632 private:
1633 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1634
1635 public:
1636 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1637 void add_monitor_chunk(MonitorChunk* chunk);
1638 void remove_monitor_chunk(MonitorChunk* chunk);
1639 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1640 void inc_in_deopt_handler() { _in_deopt_handler++; }
1641 void dec_in_deopt_handler() {
1642 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1643 if (_in_deopt_handler > 0) { // robustness
1644 _in_deopt_handler--;
1645 }
1646 }
1647
1648 private:
1649 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1650
1651 public:
1652
1653 // Frame iteration; calls the function f for all frames on the stack
1654 void frames_do(void f(frame*, const RegisterMap*));
1655
1656 // Memory operations
1657 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1658
1659 // Sweeper operations
1660 virtual void nmethods_do(CodeBlobClosure* cf);
1661
1662 // RedefineClasses Support
1663 void metadata_do(void f(Metadata*));
1664
1665 // Misc. operations
1666 char* name() const { return (char*)get_thread_name(); }
1667 void print_on(outputStream* st) const;
1668 void print_value();
1669 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1670 void print_thread_state() const PRODUCT_RETURN;
1671 void print_on_error(outputStream* st, char* buf, int buflen) const;
1672 void print_name_on_error(outputStream* st, char* buf, int buflen) const;
1673 void verify();
1674 const char* get_thread_name() const;
1675 private:
1676 // factor out low-level mechanics for use in both normal and error cases
1677 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1678 public:
1679 const char* get_threadgroup_name() const;
1680 const char* get_parent_name() const;
1681
1682 // Accessing frames
1683 frame last_frame() {
1684 _anchor.make_walkable(this);
1685 return pd_last_frame();
1686 }
1687 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1688
1689 // Returns method at 'depth' java or native frames down the stack
1690 // Used for security checks
1691 Klass* security_get_caller_class(int depth);
1692
1693 // Print stack trace in external format
1694 void print_stack_on(outputStream* st);
1695 void print_stack() { print_stack_on(tty); }
1696
1697 // Print stack traces in various internal formats
1698 void trace_stack() PRODUCT_RETURN;
1699 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1700 void trace_frames() PRODUCT_RETURN;
1701 void trace_oops() PRODUCT_RETURN;
1702
1703 // Print an annotated view of the stack frames
1704 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1705 void validate_frame_layout() {
1706 print_frame_layout(0, true);
1707 }
1708
1709 // Returns the number of stack frames on the stack
1710 int depth() const;
1711
1712 // Function for testing deoptimization
1713 void deoptimize();
1714 void make_zombies();
1715
1716 void deoptimized_wrt_marked_nmethods();
1717
1718 // Profiling operation (see fprofile.cpp)
1719 public:
1720 bool profile_last_Java_frame(frame* fr);
1721
1722 private:
1723 ThreadProfiler* _thread_profiler;
1724 private:
1725 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1726 friend class FlatProfilerTask; // uses get_thread_profiler.
1727 friend class ThreadProfilerMark; // uses get_thread_profiler.
1728 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1729 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1730 ThreadProfiler* result = _thread_profiler;
1731 _thread_profiler = tp;
1732 return result;
1733 }
1734
1735 public:
1736 // Returns the running thread as a JavaThread
1737 static inline JavaThread* current();
1738
1739 // Returns the active Java thread. Do not use this if you know you are calling
1740 // from a JavaThread, as it's slower than JavaThread::current. If called from
1741 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1742 // operation. You may not want that either.
1743 static JavaThread* active();
1744
1745 inline CompilerThread* as_CompilerThread();
1746
1747 public:
1748 virtual void run();
1749 void thread_main_inner();
1750
1751 private:
1752 // PRIVILEGED STACK
1753 PrivilegedElement* _privileged_stack_top;
1754 GrowableArray<oop>* _array_for_gc;
1755 public:
1756
1757 // Returns the privileged_stack information.
1758 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1759 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1760 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1761
1762 public:
1763 // Thread local information maintained by JVMTI.
1764 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1765 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1766 // getter is used to get this JavaThread's JvmtiThreadState if it has
1767 // one which means NULL can be returned. JvmtiThreadState::state_for()
1768 // is used to get the specified JavaThread's JvmtiThreadState if it has
1769 // one or it allocates a new JvmtiThreadState for the JavaThread and
1770 // returns it. JvmtiThreadState::state_for() will return NULL only if
1771 // the specified JavaThread is exiting.
1772 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1773 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1774 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1775 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1776
1777 // JVMTI PopFrame support
1778 // Setting and clearing popframe_condition
1779 // All of these enumerated values are bits. popframe_pending
1780 // indicates that a PopFrame() has been requested and not yet been
1781 // completed. popframe_processing indicates that that PopFrame() is in
1782 // the process of being completed. popframe_force_deopt_reexecution_bit
1783 // indicates that special handling is required when returning to a
1784 // deoptimized caller.
1785 enum PopCondition {
1786 popframe_inactive = 0x00,
1787 popframe_pending_bit = 0x01,
1788 popframe_processing_bit = 0x02,
1789 popframe_force_deopt_reexecution_bit = 0x04
1790 };
1791 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1792 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1793 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1794 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1795 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1796 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1797 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1798 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1799 #ifdef CC_INTERP
1800 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1801 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1802 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1803 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1804 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1805 #endif
1806
1807 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1808 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1809 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1810
1811 private:
1812 // Saved incoming arguments to popped frame.
1813 // Used only when popped interpreted frame returns to deoptimized frame.
1814 void* _popframe_preserved_args;
1815 int _popframe_preserved_args_size;
1816
1817 public:
1818 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1819 void* popframe_preserved_args();
1820 ByteSize popframe_preserved_args_size();
1821 WordSize popframe_preserved_args_size_in_words();
1822 void popframe_free_preserved_args();
1823
1824
1825 private:
1826 JvmtiThreadState *_jvmti_thread_state;
1827 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1828
1829 // Used by the interpreter in fullspeed mode for frame pop, method
1830 // entry, method exit and single stepping support. This field is
1831 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1832 // It can be set to zero asynchronously (i.e., without a VM operation
1833 // or a lock) so we have to be very careful.
1834 int _interp_only_mode;
1835
1836 public:
1837 // used by the interpreter for fullspeed debugging support (see above)
1838 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1839 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1840 int get_interp_only_mode() { return _interp_only_mode; }
1841 void increment_interp_only_mode() { ++_interp_only_mode; }
1842 void decrement_interp_only_mode() { --_interp_only_mode; }
1843
1844 // support for cached flag that indicates whether exceptions need to be posted for this thread
1845 // if this is false, we can avoid deoptimizing when events are thrown
1846 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1847 private:
1848 int _should_post_on_exceptions_flag;
1849
1850 public:
1851 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1852 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1853
1854 private:
1855 ThreadStatistics *_thread_stat;
1856
1857 public:
1858 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1859
1860 // Return a blocker object for which this thread is blocked parking.
1861 oop current_park_blocker();
1862
1863 private:
1864 static size_t _stack_size_at_create;
1865
1866 public:
1867 static inline size_t stack_size_at_create(void) {
1868 return _stack_size_at_create;
1869 }
1870 static inline void set_stack_size_at_create(size_t value) {
1871 _stack_size_at_create = value;
1872 }
1873
1874 // Machine dependent stuff
1875 #include OS_CPU_HEADER(thread)
1876
1877 public:
1878 void set_blocked_on_compilation(bool value) {
1879 _blocked_on_compilation = value;
1880 }
1881
1882 bool blocked_on_compilation() {
1883 return _blocked_on_compilation;
1884 }
1885 protected:
1886 bool _blocked_on_compilation;
1887
1888
1889 // JSR166 per-thread parker
1890 private:
1891 Parker* _parker;
1892 public:
1893 Parker* parker() { return _parker; }
1894
1895 // Biased locking support
1896 private:
1897 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1898 public:
1899 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1900 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1901
1902 // clearing/querying jni attach status
1903 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1904 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1905 inline void set_done_attaching_via_jni();
1906 };
1907
1908 // Inline implementation of JavaThread::current
1909 inline JavaThread* JavaThread::current() {
1910 Thread* thread = Thread::current();
1911 assert(thread->is_Java_thread(), "just checking");
1912 return (JavaThread*)thread;
1913 }
1914
1915 inline CompilerThread* JavaThread::as_CompilerThread() {
1916 assert(is_Compiler_thread(), "just checking");
1917 return (CompilerThread*)this;
1918 }
1919
1920 // Dedicated thread to sweep the code cache
1921 class CodeCacheSweeperThread : public JavaThread {
1922 CompiledMethod* _scanned_compiled_method; // nmethod being scanned by the sweeper
1923 public:
1924 CodeCacheSweeperThread();
1925 // Track the nmethod currently being scanned by the sweeper
1926 void set_scanned_compiled_method(CompiledMethod* cm) {
1927 assert(_scanned_compiled_method == NULL || cm == NULL, "should reset to NULL before writing a new value");
1928 _scanned_compiled_method = cm;
1929 }
1930
1931 // Hide sweeper thread from external view.
1932 bool is_hidden_from_external_view() const { return true; }
1933
1934 bool is_Code_cache_sweeper_thread() const { return true; }
1935
1936 // Prevent GC from unloading _scanned_compiled_method
1937 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1938 void nmethods_do(CodeBlobClosure* cf);
1939 };
1940
1941 // A thread used for Compilation.
1942 class CompilerThread : public JavaThread {
1943 friend class VMStructs;
1944 private:
1945 CompilerCounters* _counters;
1946
1947 ciEnv* _env;
1948 CompileLog* _log;
1949 CompileTask* _task;
1950 CompileQueue* _queue;
1951 BufferBlob* _buffer_blob;
1952
1953 AbstractCompiler* _compiler;
1954
1955 public:
1956
1957 static CompilerThread* current();
1958
1959 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1960
1961 bool is_Compiler_thread() const { return true; }
1962
1963 virtual bool can_call_java() const;
1964
1965 // Hide native compiler threads from external view.
1966 bool is_hidden_from_external_view() const { return !can_call_java(); }
1967
1968 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1969 AbstractCompiler* compiler() const { return _compiler; }
1970
1971 CompileQueue* queue() const { return _queue; }
1972 CompilerCounters* counters() const { return _counters; }
1973
1974 // Get/set the thread's compilation environment.
1975 ciEnv* env() { return _env; }
1976 void set_env(ciEnv* env) { _env = env; }
1977
1978 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1979 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
1980
1981 // Get/set the thread's logging information
1982 CompileLog* log() { return _log; }
1983 void init_log(CompileLog* log) {
1984 // Set once, for good.
1985 assert(_log == NULL, "set only once");
1986 _log = log;
1987 }
1988
1989 #ifndef PRODUCT
1990 private:
1991 IdealGraphPrinter *_ideal_graph_printer;
1992 public:
1993 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1994 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1995 #endif
1996
1997 // Get/set the thread's current task
1998 CompileTask* task() { return _task; }
1999 void set_task(CompileTask* task) { _task = task; }
2000 };
2001
2002 inline CompilerThread* CompilerThread::current() {
2003 return JavaThread::current()->as_CompilerThread();
2004 }
2005
2006 // The active thread queue. It also keeps track of the current used
2007 // thread priorities.
2008 class Threads: AllStatic {
2009 friend class VMStructs;
2010 private:
2011 static JavaThread* _thread_list;
2012 static int _number_of_threads;
2013 static int _number_of_non_daemon_threads;
2014 static int _return_code;
2015 static int _thread_claim_parity;
2016 #ifdef ASSERT
2017 static bool _vm_complete;
2018 #endif
2019
2020 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
2021 static void initialize_jsr292_core_classes(TRAPS);
2022 public:
2023 // Thread management
2024 // force_daemon is a concession to JNI, where we may need to add a
2025 // thread to the thread list before allocating its thread object
2026 static void add(JavaThread* p, bool force_daemon = false);
2027 static void remove(JavaThread* p);
2028 static bool includes(JavaThread* p);
2029 static JavaThread* first() { return _thread_list; }
2030 static void threads_do(ThreadClosure* tc);
2031
2032 // Initializes the vm and creates the vm thread
2033 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
2034 static void convert_vm_init_libraries_to_agents();
2035 static void create_vm_init_libraries();
2036 static void create_vm_init_agents();
2037 static void shutdown_vm_agents();
2038 static bool destroy_vm();
2039 // Supported VM versions via JNI
2040 // Includes JNI_VERSION_1_1
2041 static jboolean is_supported_jni_version_including_1_1(jint version);
2042 // Does not include JNI_VERSION_1_1
2043 static jboolean is_supported_jni_version(jint version);
2044
2045 // The "thread claim parity" provides a way for threads to be claimed
2046 // by parallel worker tasks.
2047 //
2048 // Each thread contains a a "parity" field. A task will claim the
2049 // thread only if its parity field is the same as the global parity,
2050 // which is updated by calling change_thread_claim_parity().
2051 //
2052 // For this to work change_thread_claim_parity() needs to be called
2053 // exactly once in sequential code before starting parallel tasks
2054 // that should claim threads.
2055 //
2056 // New threads get their parity set to 0 and change_thread_claim_parity()
2057 // never set the global parity to 0.
2058 static int thread_claim_parity() { return _thread_claim_parity; }
2059 static void change_thread_claim_parity();
2060 static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
2061
2062 // Apply "f->do_oop" to all root oops in all threads.
2063 // This version may only be called by sequential code.
2064 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
2065 // This version may be called by sequential or parallel code.
2066 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf);
2067 // This creates a list of GCTasks, one per thread.
2068 static void create_thread_roots_tasks(GCTaskQueue* q);
2069 // This creates a list of GCTasks, one per thread, for marking objects.
2070 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
2071
2072 // Apply "f->do_oop" to roots in all threads that
2073 // are part of compiled frames
2074 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
2075
2076 static void convert_hcode_pointers();
2077 static void restore_hcode_pointers();
2078
2079 // Sweeper
2080 static void nmethods_do(CodeBlobClosure* cf);
2081
2082 // RedefineClasses support
2083 static void metadata_do(void f(Metadata*));
2084 static void metadata_handles_do(void f(Metadata*));
2085
2086 #ifdef ASSERT
2087 static bool is_vm_complete() { return _vm_complete; }
2088 #endif
2089
2090 // Verification
2091 static void verify();
2092 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
2093 static void print(bool print_stacks, bool internal_format) {
2094 // this function is only used by debug.cpp
2095 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
2096 }
2097 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2098 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf,
2099 int buflen, bool* found_current);
2100 static void print_threads_compiling(outputStream* st, char* buf, int buflen);
2101
2102 // Get Java threads that are waiting to enter a monitor. If doLock
2103 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2104 // VM needs to be at a safepoint.
2105 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2106 address monitor, bool doLock);
2107
2108 // Get owning Java thread from the monitor's owner field. If doLock
2109 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2110 // VM needs to be at a safepoint.
2111 static JavaThread *owning_thread_from_monitor_owner(address owner,
2112 bool doLock);
2113
2114 // Number of threads on the active threads list
2115 static int number_of_threads() { return _number_of_threads; }
2116 // Number of non-daemon threads on the active threads list
2117 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2118
2119 // Deoptimizes all frames tied to marked nmethods
2120 static void deoptimized_wrt_marked_nmethods();
2121
2122 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2123
2124 };
2125
2126
2127 // Thread iterator
2128 class ThreadClosure: public StackObj {
2129 public:
2130 virtual void do_thread(Thread* thread) = 0;
2131 };
2132
2133 class SignalHandlerMark: public StackObj {
2134 private:
2135 Thread* _thread;
2136 public:
2137 SignalHandlerMark(Thread* t) {
2138 _thread = t;
2139 if (_thread) _thread->enter_signal_handler();
2140 }
2141 ~SignalHandlerMark() {
2142 if (_thread) _thread->leave_signal_handler();
2143 _thread = NULL;
2144 }
2145 };
2146
2147
2148 #endif // SHARE_VM_RUNTIME_THREAD_HPP