1 /*
2 * Copyright (c) 1997, 2017, 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/align.hpp"
48 #include "utilities/exceptions.hpp"
49 #include "utilities/macros.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc/g1/dirtyCardQueue.hpp"
52 #include "gc/g1/satbMarkQueue.hpp"
53 #endif // INCLUDE_ALL_GCS
54 #ifdef ZERO
55 # include "stack_zero.hpp"
56 #endif
57
58 class ThreadSafepointState;
59 class ThreadProfiler;
60
61 class JvmtiThreadState;
62 class JvmtiGetLoadedClassesClosure;
63 class ThreadStatistics;
64 class ConcurrentLocksDump;
65 class ParkEvent;
66 class Parker;
67
68 class ciEnv;
69 class CompileThread;
70 class CompileLog;
71 class CompileTask;
72 class CompileQueue;
73 class CompilerCounters;
74 class vframeArray;
75
76 class DeoptResourceMark;
77 class jvmtiDeferredLocalVariableSet;
78
79 class GCTaskQueue;
80 class ThreadClosure;
81 class IdealGraphPrinter;
82
83 class Metadata;
84 template <class T, MEMFLAGS F> class ChunkedList;
85 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
86
87 DEBUG_ONLY(class ResourceMark;)
88
89 class WorkerThread;
90
91 // Class hierarchy
92 // - Thread
93 // - NamedThread
94 // - VMThread
95 // - ConcurrentGCThread
96 // - WorkerThread
97 // - GangWorker
98 // - GCTaskThread
99 // - JavaThread
100 // - various subclasses eg CompilerThread, ServiceThread
101 // - WatcherThread
102
103 class Thread: public ThreadShadow {
104 friend class VMStructs;
105 friend class JVMCIVMStructs;
106 private:
107
108 #ifndef USE_LIBRARY_BASED_TLS_ONLY
109 // Current thread is maintained as a thread-local variable
110 static THREAD_LOCAL_DECL Thread* _thr_current;
111 #endif
112
113 // Exception handling
114 // (Note: _pending_exception and friends are in ThreadShadow)
115 //oop _pending_exception; // pending exception for current thread
116 // const char* _exception_file; // file information for exception (debugging only)
117 // int _exception_line; // line information for exception (debugging only)
118 protected:
119 // Support for forcing alignment of thread objects for biased locking
120 void* _real_malloc_address;
121 public:
122 void* operator new(size_t size) throw() { return allocate(size, true); }
123 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
124 return allocate(size, false); }
125 void operator delete(void* p);
126
127 protected:
128 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
129 private:
130
131 // ***************************************************************
132 // Suspend and resume support
133 // ***************************************************************
134 //
135 // VM suspend/resume no longer exists - it was once used for various
136 // things including safepoints but was deprecated and finally removed
137 // in Java 7. Because VM suspension was considered "internal" Java-level
138 // suspension was considered "external", and this legacy naming scheme
139 // remains.
140 //
141 // External suspend/resume requests come from JVM_SuspendThread,
142 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
143 // ResumeThread. External
144 // suspend requests cause _external_suspend to be set and external
145 // resume requests cause _external_suspend to be cleared.
146 // External suspend requests do not nest on top of other external
147 // suspend requests. The higher level APIs reject suspend requests
148 // for already suspended threads.
149 //
150 // The external_suspend
151 // flag is checked by has_special_runtime_exit_condition() and java thread
152 // will self-suspend when handle_special_runtime_exit_condition() is
153 // called. Most uses of the _thread_blocked state in JavaThreads are
154 // considered the same as being externally suspended; if the blocking
155 // condition lifts, the JavaThread will self-suspend. Other places
156 // where VM checks for external_suspend include:
157 // + mutex granting (do not enter monitors when thread is suspended)
158 // + state transitions from _thread_in_native
159 //
160 // In general, java_suspend() does not wait for an external suspend
161 // request to complete. When it returns, the only guarantee is that
162 // the _external_suspend field is true.
163 //
164 // wait_for_ext_suspend_completion() is used to wait for an external
165 // suspend request to complete. External suspend requests are usually
166 // followed by some other interface call that requires the thread to
167 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
168 // the interface that requires quiescence, we give the JavaThread a
169 // chance to self-suspend before we need it to be quiescent. This
170 // improves overall suspend/query performance.
171 //
172 // _suspend_flags controls the behavior of java_ suspend/resume.
173 // It must be set under the protection of SR_lock. Read from the flag is
174 // OK without SR_lock as long as the value is only used as a hint.
175 // (e.g., check _external_suspend first without lock and then recheck
176 // inside SR_lock and finish the suspension)
177 //
178 // _suspend_flags is also overloaded for other "special conditions" so
179 // that a single check indicates whether any special action is needed
180 // eg. for async exceptions.
181 // -------------------------------------------------------------------
182 // Notes:
183 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
184 // but we still update its value to keep other part of the system (mainly
185 // JVMTI) happy. ThreadState is legacy code (see notes in
186 // osThread.hpp).
187 //
188 // 2. It would be more natural if set_external_suspend() is private and
189 // part of java_suspend(), but that probably would affect the suspend/query
190 // performance. Need more investigation on this.
191
192 // suspend/resume lock: used for self-suspend
193 Monitor* _SR_lock;
194
195 protected:
196 enum SuspendFlags {
197 // NOTE: avoid using the sign-bit as cc generates different test code
198 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
199
200 _external_suspend = 0x20000000U, // thread is asked to self suspend
201 _ext_suspended = 0x40000000U, // thread has self-suspended
202 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
203
204 _has_async_exception = 0x00000001U, // there is a pending async exception
205 _critical_native_unlock = 0x00000002U, // Must call back to unlock JNI critical lock
206
207 _trace_flag = 0x00000004U // call tracing backend
208 };
209
210 // various suspension related flags - atomically updated
211 // overloaded for async exception checking in check_special_condition_for_native_trans.
212 volatile uint32_t _suspend_flags;
213
214 private:
215 int _num_nested_signal;
216
217 DEBUG_ONLY(bool _suspendible_thread;)
218
219 public:
220 void enter_signal_handler() { _num_nested_signal++; }
221 void leave_signal_handler() { _num_nested_signal--; }
222 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
223
224 #ifdef ASSERT
225 void set_suspendible_thread() {
226 _suspendible_thread = true;
227 }
228
229 void clear_suspendible_thread() {
230 _suspendible_thread = false;
231 }
232
233 bool is_suspendible_thread() { return _suspendible_thread; }
234 #endif
235
236 private:
237 // Active_handles points to a block of handles
238 JNIHandleBlock* _active_handles;
239
240 // One-element thread local free list
241 JNIHandleBlock* _free_handle_block;
242
243 // Point to the last handle mark
244 HandleMark* _last_handle_mark;
245
246 // The parity of the last strong_roots iteration in which this thread was
247 // claimed as a task.
248 jint _oops_do_parity;
249
250 public:
251 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
252 HandleMark* last_handle_mark() const { return _last_handle_mark; }
253 private:
254
255 // debug support for checking if code does allow safepoints or not
256 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
257 // mutex, or blocking on an object synchronizer (Java locking).
258 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
259 // If !allow_allocation(), then an assertion failure will happen during allocation
260 // (Hence, !allow_safepoint() => !allow_allocation()).
261 //
262 // The two classes NoSafepointVerifier and No_Allocation_Verifier are used to set these counters.
263 //
264 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
265 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
266
267 // Used by SkipGCALot class.
268 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
269
270 friend class NoAllocVerifier;
271 friend class NoSafepointVerifier;
272 friend class PauseNoSafepointVerifier;
273 friend class GCLocker;
274
275 ThreadLocalAllocBuffer _tlab; // Thread-local eden
276 jlong _allocated_bytes; // Cumulative number of bytes allocated on
277 // the Java heap
278
279 mutable TRACE_DATA _trace_data; // Thread-local data for tracing
280
281 ThreadExt _ext;
282
283 int _vm_operation_started_count; // VM_Operation support
284 int _vm_operation_completed_count; // VM_Operation support
285
286 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
287 // is waiting to lock
288 bool _current_pending_monitor_is_from_java; // locking is from Java code
289
290 // ObjectMonitor on which this thread called Object.wait()
291 ObjectMonitor* _current_waiting_monitor;
292
293 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
294 public:
295 ObjectMonitor* omFreeList;
296 int omFreeCount; // length of omFreeList
297 int omFreeProvision; // reload chunk size
298 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
299 int omInUseCount; // length of omInUseList
300
301 #ifdef ASSERT
302 private:
303 bool _visited_for_critical_count;
304
305 public:
306 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
307 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
308 #endif
309
310 public:
311 enum {
312 is_definitely_current_thread = true
313 };
314
315 // Constructor
316 Thread();
317 virtual ~Thread();
318
319 // Manage Thread::current()
320 void initialize_thread_current();
321 void clear_thread_current(); // TLS cleanup needed before threads terminate
322
323 public:
324 // thread entry point
325 virtual void run();
326
327 // Testers
328 virtual bool is_VM_thread() const { return false; }
329 virtual bool is_Java_thread() const { return false; }
330 virtual bool is_Compiler_thread() const { return false; }
331 virtual bool is_Code_cache_sweeper_thread() const { return false; }
332 virtual bool is_hidden_from_external_view() const { return false; }
333 virtual bool is_jvmti_agent_thread() const { return false; }
334 // True iff the thread can perform GC operations at a safepoint.
335 // Generally will be true only of VM thread and parallel GC WorkGang
336 // threads.
337 virtual bool is_GC_task_thread() const { return false; }
338 virtual bool is_Watcher_thread() const { return false; }
339 virtual bool is_ConcurrentGC_thread() const { return false; }
340 virtual bool is_Named_thread() const { return false; }
341 virtual bool is_Worker_thread() const { return false; }
342
343 // Can this thread make Java upcalls
344 virtual bool can_call_java() const { return false; }
345
346 // Casts
347 virtual WorkerThread* as_Worker_thread() const { return NULL; }
348
349 virtual char* name() const { return (char*)"Unknown thread"; }
350
351 // Returns the current thread (ASSERTS if NULL)
352 static inline Thread* current();
353 // Returns the current thread, or NULL if not attached
354 static inline Thread* current_or_null();
355 // Returns the current thread, or NULL if not attached, and is
356 // safe for use from signal-handlers
357 static inline Thread* current_or_null_safe();
358
359 // Common thread operations
360 static void set_priority(Thread* thread, ThreadPriority priority);
361 static ThreadPriority get_priority(const Thread* const thread);
362 static void start(Thread* thread);
363 static void interrupt(Thread* thr);
364 static bool is_interrupted(Thread* thr, bool clear_interrupted);
365
366 void set_native_thread_name(const char *name) {
367 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
368 os::set_native_thread_name(name);
369 }
370
371 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
372 Monitor* SR_lock() const { return _SR_lock; }
373
374 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
375
376 inline void set_suspend_flag(SuspendFlags f);
377 inline void clear_suspend_flag(SuspendFlags f);
378
379 inline void set_has_async_exception();
380 inline void clear_has_async_exception();
381
382 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
383
384 inline void set_critical_native_unlock();
385 inline void clear_critical_native_unlock();
386
387 inline void set_trace_flag();
388 inline void clear_trace_flag();
389
390 // Support for Unhandled Oop detection
391 // Add the field for both, fastdebug and debug, builds to keep
392 // Thread's fields layout the same.
393 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build.
394 #ifdef CHECK_UNHANDLED_OOPS
395 private:
396 UnhandledOops* _unhandled_oops;
397 #elif defined(ASSERT)
398 private:
399 void* _unhandled_oops;
400 #endif
401 #ifdef CHECK_UNHANDLED_OOPS
402 public:
403 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
404 // Mark oop safe for gc. It may be stack allocated but won't move.
405 void allow_unhandled_oop(oop *op) {
406 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
407 }
408 // Clear oops at safepoint so crashes point to unhandled oop violator
409 void clear_unhandled_oops() {
410 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
411 }
412 #endif // CHECK_UNHANDLED_OOPS
413
414 public:
415 #ifndef PRODUCT
416 bool skip_gcalot() { return _skip_gcalot; }
417 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
418 #endif
419
420 // Installs a pending exception to be inserted later
421 static void send_async_exception(oop thread_oop, oop java_throwable);
422
423 // Resource area
424 ResourceArea* resource_area() const { return _resource_area; }
425 void set_resource_area(ResourceArea* area) { _resource_area = area; }
426
427 OSThread* osthread() const { return _osthread; }
428 void set_osthread(OSThread* thread) { _osthread = thread; }
429
430 // JNI handle support
431 JNIHandleBlock* active_handles() const { return _active_handles; }
432 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
433 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
434 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
435
436 // Internal handle support
437 HandleArea* handle_area() const { return _handle_area; }
438 void set_handle_area(HandleArea* area) { _handle_area = area; }
439
440 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
441 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
442
443 // Thread-Local Allocation Buffer (TLAB) support
444 ThreadLocalAllocBuffer& tlab() { return _tlab; }
445 void initialize_tlab() {
446 if (UseTLAB) {
447 tlab().initialize();
448 }
449 }
450
451 jlong allocated_bytes() { return _allocated_bytes; }
452 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
453 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
454 inline jlong cooked_allocated_bytes();
455
456 TRACE_DEFINE_THREAD_TRACE_DATA_OFFSET;
457 TRACE_DATA* trace_data() const { return &_trace_data; }
458 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; }
459
460 const ThreadExt& ext() const { return _ext; }
461 ThreadExt& ext() { return _ext; }
462
463 // VM operation support
464 int vm_operation_ticket() { return ++_vm_operation_started_count; }
465 int vm_operation_completed_count() { return _vm_operation_completed_count; }
466 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
467
468 // For tracking the heavyweight monitor the thread is pending on.
469 ObjectMonitor* current_pending_monitor() {
470 return _current_pending_monitor;
471 }
472 void set_current_pending_monitor(ObjectMonitor* monitor) {
473 _current_pending_monitor = monitor;
474 }
475 void set_current_pending_monitor_is_from_java(bool from_java) {
476 _current_pending_monitor_is_from_java = from_java;
477 }
478 bool current_pending_monitor_is_from_java() {
479 return _current_pending_monitor_is_from_java;
480 }
481
482 // For tracking the ObjectMonitor on which this thread called Object.wait()
483 ObjectMonitor* current_waiting_monitor() {
484 return _current_waiting_monitor;
485 }
486 void set_current_waiting_monitor(ObjectMonitor* monitor) {
487 _current_waiting_monitor = monitor;
488 }
489
490 // GC support
491 // Apply "f->do_oop" to all root oops in "this".
492 // Used by JavaThread::oops_do.
493 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
494 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf);
495
496 // Handles the parallel case for the method below.
497 private:
498 bool claim_oops_do_par_case(int collection_parity);
499 public:
500 // Requires that "collection_parity" is that of the current roots
501 // iteration. If "is_par" is false, sets the parity of "this" to
502 // "collection_parity", and returns "true". If "is_par" is true,
503 // uses an atomic instruction to set the current threads parity to
504 // "collection_parity", if it is not already. Returns "true" iff the
505 // calling thread does the update, this indicates that the calling thread
506 // has claimed the thread's stack as a root groop in the current
507 // collection.
508 bool claim_oops_do(bool is_par, int collection_parity) {
509 if (!is_par) {
510 _oops_do_parity = collection_parity;
511 return true;
512 } else {
513 return claim_oops_do_par_case(collection_parity);
514 }
515 }
516
517 // jvmtiRedefineClasses support
518 void metadata_handles_do(void f(Metadata*));
519
520 // Used by fast lock support
521 virtual bool is_lock_owned(address adr) const;
522
523 // Check if address is in the stack of the thread (not just for locks).
524 // Warning: the method can only be used on the running thread
525 bool is_in_stack(address adr) const;
526 // Check if address is in the usable part of the stack (excludes protected
527 // guard pages)
528 bool is_in_usable_stack(address adr) const;
529
530 // Sets this thread as starting thread. Returns failure if thread
531 // creation fails due to lack of memory, too many threads etc.
532 bool set_as_starting_thread();
533
534 protected:
535 // OS data associated with the thread
536 OSThread* _osthread; // Platform-specific thread information
537
538 // Thread local resource area for temporary allocation within the VM
539 ResourceArea* _resource_area;
540
541 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
542
543 // Thread local handle area for allocation of handles within the VM
544 HandleArea* _handle_area;
545 GrowableArray<Metadata*>* _metadata_handles;
546
547 // Support for stack overflow handling, get_thread, etc.
548 address _stack_base;
549 size_t _stack_size;
550 uintptr_t _self_raw_id; // used by get_thread (mutable)
551 int _lgrp_id;
552
553 public:
554 // Stack overflow support
555 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
556 void set_stack_base(address base) { _stack_base = base; }
557 size_t stack_size() const { return _stack_size; }
558 void set_stack_size(size_t size) { _stack_size = size; }
559 address stack_end() const { return stack_base() - stack_size(); }
560 void record_stack_base_and_size();
561
562 bool on_local_stack(address adr) const {
563 // QQQ this has knowledge of direction, ought to be a stack method
564 return (_stack_base >= adr && adr >= stack_end());
565 }
566
567 uintptr_t self_raw_id() { return _self_raw_id; }
568 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
569
570 int lgrp_id() const { return _lgrp_id; }
571 void set_lgrp_id(int value) { _lgrp_id = value; }
572
573 // Printing
574 virtual void print_on(outputStream* st) const;
575 void print() const { print_on(tty); }
576 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
577
578 // Debug-only code
579 #ifdef ASSERT
580 private:
581 // Deadlock detection support for Mutex locks. List of locks own by thread.
582 Monitor* _owned_locks;
583 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
584 // thus the friendship
585 friend class Mutex;
586 friend class Monitor;
587
588 public:
589 void print_owned_locks_on(outputStream* st) const;
590 void print_owned_locks() const { print_owned_locks_on(tty); }
591 Monitor* owned_locks() const { return _owned_locks; }
592 bool owns_locks() const { return owned_locks() != NULL; }
593 bool owns_locks_but_compiled_lock() const;
594 int oops_do_parity() const { return _oops_do_parity; }
595
596 // Deadlock detection
597 bool allow_allocation() { return _allow_allocation_count == 0; }
598 ResourceMark* current_resource_mark() { return _current_resource_mark; }
599 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
600 #endif
601
602 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
603
604 private:
605 volatile int _jvmti_env_iteration_count;
606
607 public:
608 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
609 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
610 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
611
612 // Code generation
613 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
614 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
615 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
616
617 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
618 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
619
620 #define TLAB_FIELD_OFFSET(name) \
621 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
622
623 TLAB_FIELD_OFFSET(start)
624 TLAB_FIELD_OFFSET(end)
625 TLAB_FIELD_OFFSET(top)
626 TLAB_FIELD_OFFSET(pf_top)
627 TLAB_FIELD_OFFSET(size) // desired_size
628 TLAB_FIELD_OFFSET(refill_waste_limit)
629 TLAB_FIELD_OFFSET(number_of_refills)
630 TLAB_FIELD_OFFSET(fast_refill_waste)
631 TLAB_FIELD_OFFSET(slow_allocations)
632
633 #undef TLAB_FIELD_OFFSET
634
635 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
636
637 public:
638 volatile intptr_t _Stalled;
639 volatile int _TypeTag;
640 ParkEvent * _ParkEvent; // for synchronized()
641 ParkEvent * _SleepEvent; // for Thread.sleep
642 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
643 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
644 int NativeSyncRecursion; // diagnostic
645
646 volatile int _OnTrap; // Resume-at IP delta
647 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
648 jint _hashStateX; // thread-specific hashCode generator state
649 jint _hashStateY;
650 jint _hashStateZ;
651 void * _schedctl;
652
653
654 volatile jint rng[4]; // RNG for spin loop
655
656 // Low-level leaf-lock primitives used to implement synchronization
657 // and native monitor-mutex infrastructure.
658 // Not for general synchronization use.
659 static void SpinAcquire(volatile int * Lock, const char * Name);
660 static void SpinRelease(volatile int * Lock);
661 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
662 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
663 static void muxRelease(volatile intptr_t * Lock);
664 };
665
666 // Inline implementation of Thread::current()
667 inline Thread* Thread::current() {
668 Thread* current = current_or_null();
669 assert(current != NULL, "Thread::current() called on detached thread");
670 return current;
671 }
672
673 inline Thread* Thread::current_or_null() {
674 #ifndef USE_LIBRARY_BASED_TLS_ONLY
675 return _thr_current;
676 #else
677 return ThreadLocalStorage::thread();
678 #endif
679 }
680
681 inline Thread* Thread::current_or_null_safe() {
682 return ThreadLocalStorage::thread();
683 }
684
685 // Name support for threads. non-JavaThread subclasses with multiple
686 // uniquely named instances should derive from this.
687 class NamedThread: public Thread {
688 friend class VMStructs;
689 enum {
690 max_name_len = 64
691 };
692 private:
693 char* _name;
694 // log JavaThread being processed by oops_do
695 JavaThread* _processed_thread;
696 uint _gc_id; // The current GC id when a thread takes part in GC
697
698 public:
699 NamedThread();
700 ~NamedThread();
701 // May only be called once per thread.
702 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
703 void initialize_named_thread();
704 virtual bool is_Named_thread() const { return true; }
705 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
706 JavaThread *processed_thread() { return _processed_thread; }
707 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
708 virtual void print_on(outputStream* st) const;
709
710 void set_gc_id(uint gc_id) { _gc_id = gc_id; }
711 uint gc_id() { return _gc_id; }
712 };
713
714 // Worker threads are named and have an id of an assigned work.
715 class WorkerThread: public NamedThread {
716 private:
717 uint _id;
718 public:
719 WorkerThread() : _id(0) { }
720 virtual bool is_Worker_thread() const { return true; }
721
722 virtual WorkerThread* as_Worker_thread() const {
723 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
724 return (WorkerThread*) this;
725 }
726
727 void set_id(uint work_id) { _id = work_id; }
728 uint id() const { return _id; }
729 };
730
731 // A single WatcherThread is used for simulating timer interrupts.
732 class WatcherThread: public Thread {
733 friend class VMStructs;
734 public:
735 virtual void run();
736
737 private:
738 static WatcherThread* _watcher_thread;
739
740 static bool _startable;
741 // volatile due to at least one lock-free read
742 volatile static bool _should_terminate;
743 public:
744 enum SomeConstants {
745 delay_interval = 10 // interrupt delay in milliseconds
746 };
747
748 // Constructor
749 WatcherThread();
750
751 // No destruction allowed
752 ~WatcherThread() {
753 guarantee(false, "WatcherThread deletion must fix the race with VM termination");
754 }
755
756 // Tester
757 bool is_Watcher_thread() const { return true; }
758
759 // Printing
760 char* name() const { return (char*)"VM Periodic Task Thread"; }
761 void print_on(outputStream* st) const;
762 void unpark();
763
764 // Returns the single instance of WatcherThread
765 static WatcherThread* watcher_thread() { return _watcher_thread; }
766
767 // Create and start the single instance of WatcherThread, or stop it on shutdown
768 static void start();
769 static void stop();
770 // Only allow start once the VM is sufficiently initialized
771 // Otherwise the first task to enroll will trigger the start
772 static void make_startable();
773 private:
774 int sleep() const;
775 };
776
777
778 class CompilerThread;
779
780 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
781
782 class JavaThread: public Thread {
783 friend class VMStructs;
784 friend class JVMCIVMStructs;
785 friend class WhiteBox;
786 private:
787 JavaThread* _next; // The next thread in the Threads list
788 oop _threadObj; // The Java level thread object
789
790 #ifdef ASSERT
791 private:
792 int _java_call_counter;
793
794 public:
795 int java_call_counter() { return _java_call_counter; }
796 void inc_java_call_counter() { _java_call_counter++; }
797 void dec_java_call_counter() {
798 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
799 _java_call_counter--;
800 }
801 private: // restore original namespace restriction
802 #endif // ifdef ASSERT
803
804 #ifndef PRODUCT
805 public:
806 enum {
807 jump_ring_buffer_size = 16
808 };
809 private: // restore original namespace restriction
810 #endif
811
812 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
813
814 ThreadFunction _entry_point;
815
816 JNIEnv _jni_environment;
817
818 // Deopt support
819 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
820
821 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
822 // transition out of native
823 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized
824 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
825 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
826 // Because deoptimization is lazy we must save jvmti requests to set locals
827 // in compiled frames until we deoptimize and we have an interpreter frame.
828 // This holds the pointer to array (yeah like there might be more than one) of
829 // description of compiled vframes that have locals that need to be updated.
830 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
831
832 // Handshake value for fixing 6243940. We need a place for the i2c
833 // adapter to store the callee Method*. This value is NEVER live
834 // across a gc point so it does NOT have to be gc'd
835 // The handshake is open ended since we can't be certain that it will
836 // be NULLed. This is because we rarely ever see the race and end up
837 // in handle_wrong_method which is the backend of the handshake. See
838 // code in i2c adapters and handle_wrong_method.
839
840 Method* _callee_target;
841
842 // Used to pass back results to the interpreter or generated code running Java code.
843 oop _vm_result; // oop result is GC-preserved
844 Metadata* _vm_result_2; // non-oop result
845
846 // See ReduceInitialCardMarks: this holds the precise space interval of
847 // the most recent slow path allocation for which compiled code has
848 // elided card-marks for performance along the fast-path.
849 MemRegion _deferred_card_mark;
850
851 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
852 // allocated during deoptimization
853 // and by JNI_MonitorEnter/Exit
854
855 // Async. requests support
856 enum AsyncRequests {
857 _no_async_condition = 0,
858 _async_exception,
859 _async_unsafe_access_error
860 };
861 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
862 oop _pending_async_exception;
863
864 // Safepoint support
865 public: // Expose _thread_state for SafeFetchInt()
866 volatile JavaThreadState _thread_state;
867 private:
868 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
869 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
870
871 // JavaThread termination support
872 enum TerminatedTypes {
873 _not_terminated = 0xDEAD - 2,
874 _thread_exiting, // JavaThread::exit() has been called for this thread
875 _thread_terminated, // JavaThread is removed from thread list
876 _vm_exited // JavaThread is still executing native code, but VM is terminated
877 // only VM_Exit can set _vm_exited
878 };
879
880 // In general a JavaThread's _terminated field transitions as follows:
881 //
882 // _not_terminated => _thread_exiting => _thread_terminated
883 //
884 // _vm_exited is a special value to cover the case of a JavaThread
885 // executing native code after the VM itself is terminated.
886 volatile TerminatedTypes _terminated;
887 // suspend/resume support
888 volatile bool _suspend_equivalent; // Suspend equivalent condition
889 jint _in_deopt_handler; // count of deoptimization
890 // handlers thread is in
891 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
892 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
893 // never locked) when throwing an exception. Used by interpreter only.
894
895 // JNI attach states:
896 enum JNIAttachStates {
897 _not_attaching_via_jni = 1, // thread is not attaching via JNI
898 _attaching_via_jni, // thread is attaching via JNI
899 _attached_via_jni // thread has attached via JNI
900 };
901
902 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
903 // A native thread that is attaching via JNI starts with a value
904 // of _attaching_via_jni and transitions to _attached_via_jni.
905 volatile JNIAttachStates _jni_attach_state;
906
907 public:
908 // State of the stack guard pages for this thread.
909 enum StackGuardState {
910 stack_guard_unused, // not needed
911 stack_guard_reserved_disabled,
912 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow
913 stack_guard_enabled // enabled
914 };
915
916 private:
917
918 #if INCLUDE_JVMCI
919 // The _pending_* fields below are used to communicate extra information
920 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
921
922 // Communicates the DeoptReason and DeoptAction of the uncommon trap
923 int _pending_deoptimization;
924
925 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
926 // before the monitor has been acquired.
927 bool _pending_monitorenter;
928
929 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
930 bool _pending_transfer_to_interpreter;
931
932 // Guard for re-entrant call to JVMCIRuntime::adjust_comp_level
933 bool _adjusting_comp_level;
934
935 // An object that JVMCI compiled code can use to further describe and
936 // uniquely identify the speculative optimization guarded by the uncommon trap
937 oop _pending_failed_speculation;
938
939 // These fields are mutually exclusive in terms of live ranges.
940 union {
941 // Communicates the pc at which the most recent implicit exception occurred
942 // from the signal handler to a deoptimization stub.
943 address _implicit_exception_pc;
944
945 // Communicates an alternative call target to an i2c stub from a JavaCall .
946 address _alternate_call_target;
947 } _jvmci;
948
949 // Support for high precision, thread sensitive counters in JVMCI compiled code.
950 jlong* _jvmci_counters;
951
952 public:
953 static jlong* _jvmci_old_thread_counters;
954 static void collect_counters(typeArrayOop array);
955 private:
956 #endif // INCLUDE_JVMCI
957
958 StackGuardState _stack_guard_state;
959
960 // Precompute the limit of the stack as used in stack overflow checks.
961 // We load it from here to simplify the stack overflow check in assembly.
962 address _stack_overflow_limit;
963 address _reserved_stack_activation;
964
965 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
966 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
967 // code)
968 volatile oop _exception_oop; // Exception thrown in compiled code
969 volatile address _exception_pc; // PC where exception happened
970 volatile address _exception_handler_pc; // PC for handler of exception
971 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
972
973 private:
974 // support for JNI critical regions
975 jint _jni_active_critical; // count of entries into JNI critical region
976
977 // Checked JNI: function name requires exception check
978 char* _pending_jni_exception_check_fn;
979
980 // For deadlock detection.
981 int _depth_first_number;
982
983 // JVMTI PopFrame support
984 // This is set to popframe_pending to signal that top Java frame should be popped immediately
985 int _popframe_condition;
986
987 // If reallocation of scalar replaced objects fails, we throw OOM
988 // and during exception propagation, pop the top
989 // _frames_to_pop_failed_realloc frames, the ones that reference
990 // failed reallocations.
991 int _frames_to_pop_failed_realloc;
992
993 #ifndef PRODUCT
994 int _jmp_ring_index;
995 struct {
996 // We use intptr_t instead of address so debugger doesn't try and display strings
997 intptr_t _target;
998 intptr_t _instruction;
999 const char* _file;
1000 int _line;
1001 } _jmp_ring[jump_ring_buffer_size];
1002 #endif // PRODUCT
1003
1004 #if INCLUDE_ALL_GCS
1005 // Support for G1 barriers
1006
1007 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier.
1008 // Set of all such queues.
1009 static SATBMarkQueueSet _satb_mark_queue_set;
1010
1011 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
1012 // Set of all such queues.
1013 static DirtyCardQueueSet _dirty_card_queue_set;
1014
1015 void flush_barrier_queues();
1016 #endif // INCLUDE_ALL_GCS
1017
1018 friend class VMThread;
1019 friend class ThreadWaitTransition;
1020 friend class VM_Exit;
1021
1022 void initialize(); // Initialized the instance variables
1023
1024 public:
1025 // Constructor
1026 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1027 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1028 ~JavaThread();
1029
1030 #ifdef ASSERT
1031 // verify this JavaThread hasn't be published in the Threads::list yet
1032 void verify_not_published();
1033 #endif
1034
1035 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1036 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1037 _jni_environment.functions = functionTable;
1038 }
1039 struct JNINativeInterface_* get_jni_functions() {
1040 return (struct JNINativeInterface_ *)_jni_environment.functions;
1041 }
1042
1043 // This function is called at thread creation to allow
1044 // platform specific thread variables to be initialized.
1045 void cache_global_variables();
1046
1047 // Executes Shutdown.shutdown()
1048 void invoke_shutdown_hooks();
1049
1050 // Cleanup on thread exit
1051 enum ExitType {
1052 normal_exit,
1053 jni_detach
1054 };
1055 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1056
1057 void cleanup_failed_attach_current_thread();
1058
1059 // Testers
1060 virtual bool is_Java_thread() const { return true; }
1061 virtual bool can_call_java() const { return true; }
1062
1063 // Thread chain operations
1064 JavaThread* next() const { return _next; }
1065 void set_next(JavaThread* p) { _next = p; }
1066
1067 // Thread oop. threadObj() can be NULL for initial JavaThread
1068 // (or for threads attached via JNI)
1069 oop threadObj() const { return _threadObj; }
1070 void set_threadObj(oop p) { _threadObj = p; }
1071
1072 ThreadPriority java_priority() const; // Read from threadObj()
1073
1074 // Prepare thread and add to priority queue. If a priority is
1075 // not specified, use the priority of the thread object. Threads_lock
1076 // must be held while this function is called.
1077 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1078 void prepare_ext();
1079
1080 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1081 address saved_exception_pc() { return _saved_exception_pc; }
1082
1083
1084 ThreadFunction entry_point() const { return _entry_point; }
1085
1086 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1087 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1088
1089 // Last frame anchor routines
1090
1091 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1092
1093 // last_Java_sp
1094 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1095 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1096
1097 // last_Java_pc
1098
1099 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1100
1101 // Safepoint support
1102 #if !(defined(PPC64) || defined(AARCH64))
1103 JavaThreadState thread_state() const { return _thread_state; }
1104 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1105 #else
1106 // Use membars when accessing volatile _thread_state. See
1107 // Threads::create_vm() for size checks.
1108 inline JavaThreadState thread_state() const;
1109 inline void set_thread_state(JavaThreadState s);
1110 #endif
1111 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1112 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1113 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1114
1115 // thread has called JavaThread::exit() or is terminated
1116 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1117 // thread is terminated (no longer on the threads list); we compare
1118 // against the two non-terminated values so that a freed JavaThread
1119 // will also be considered terminated.
1120 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1121 void set_terminated(TerminatedTypes t) { _terminated = t; }
1122 // special for Threads::remove() which is static:
1123 void set_terminated_value() { _terminated = _thread_terminated; }
1124 void block_if_vm_exited();
1125
1126 bool doing_unsafe_access() { return _doing_unsafe_access; }
1127 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1128
1129 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1130 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1131
1132 // Suspend/resume support for JavaThread
1133 private:
1134 inline void set_ext_suspended();
1135 inline void clear_ext_suspended();
1136
1137 public:
1138 void java_suspend();
1139 void java_resume();
1140 int java_suspend_self();
1141
1142 void check_and_wait_while_suspended() {
1143 assert(JavaThread::current() == this, "sanity check");
1144
1145 bool do_self_suspend;
1146 do {
1147 // were we externally suspended while we were waiting?
1148 do_self_suspend = handle_special_suspend_equivalent_condition();
1149 if (do_self_suspend) {
1150 // don't surprise the thread that suspended us by returning
1151 java_suspend_self();
1152 set_suspend_equivalent();
1153 }
1154 } while (do_self_suspend);
1155 }
1156 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1157 // Check for async exception in addition to safepoint and suspend request.
1158 static void check_special_condition_for_native_trans(JavaThread *thread);
1159
1160 // Same as check_special_condition_for_native_trans but finishes the
1161 // transition into thread_in_Java mode so that it can potentially
1162 // block.
1163 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1164
1165 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1166 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1167 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1168 // Warning: is_ext_suspend_completed() may temporarily drop the
1169 // SR_lock to allow the thread to reach a stable thread state if
1170 // it is currently in a transient thread state.
1171 return is_ext_suspend_completed(false /* !called_by_wait */,
1172 SuspendRetryDelay, bits);
1173 }
1174
1175 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1176 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1177 // passed as the count and delay parameters. Experiments with specific
1178 // calls to wait_for_ext_suspend_completion() can be done by passing
1179 // other values in the code. Experiments with all calls can be done
1180 // via the appropriate -XX options.
1181 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1182
1183 inline void set_external_suspend();
1184 inline void clear_external_suspend();
1185
1186 inline void set_deopt_suspend();
1187 inline void clear_deopt_suspend();
1188 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1189
1190 bool is_external_suspend() const {
1191 return (_suspend_flags & _external_suspend) != 0;
1192 }
1193 // Whenever a thread transitions from native to vm/java it must suspend
1194 // if external|deopt suspend is present.
1195 bool is_suspend_after_native() const {
1196 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1197 }
1198
1199 // external suspend request is completed
1200 bool is_ext_suspended() const {
1201 return (_suspend_flags & _ext_suspended) != 0;
1202 }
1203
1204 bool is_external_suspend_with_lock() const {
1205 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1206 return is_external_suspend();
1207 }
1208
1209 // Special method to handle a pending external suspend request
1210 // when a suspend equivalent condition lifts.
1211 bool handle_special_suspend_equivalent_condition() {
1212 assert(is_suspend_equivalent(),
1213 "should only be called in a suspend equivalence condition");
1214 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1215 bool ret = is_external_suspend();
1216 if (!ret) {
1217 // not about to self-suspend so clear suspend equivalence
1218 clear_suspend_equivalent();
1219 }
1220 // implied else:
1221 // We have a pending external suspend request so we leave the
1222 // suspend_equivalent flag set until java_suspend_self() sets
1223 // the ext_suspended flag and clears the suspend_equivalent
1224 // flag. This insures that wait_for_ext_suspend_completion()
1225 // will return consistent values.
1226 return ret;
1227 }
1228
1229 // utility methods to see if we are doing some kind of suspension
1230 bool is_being_ext_suspended() const {
1231 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1232 return is_ext_suspended() || is_external_suspend();
1233 }
1234
1235 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1236
1237 void set_suspend_equivalent() { _suspend_equivalent = true; }
1238 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1239
1240 // Thread.stop support
1241 void send_thread_stop(oop throwable);
1242 AsyncRequests clear_special_runtime_exit_condition() {
1243 AsyncRequests x = _special_runtime_exit_condition;
1244 _special_runtime_exit_condition = _no_async_condition;
1245 return x;
1246 }
1247
1248 // Are any async conditions present?
1249 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1250
1251 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1252
1253 // these next two are also used for self-suspension and async exception support
1254 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1255
1256 // Return true if JavaThread has an asynchronous condition or
1257 // if external suspension is requested.
1258 bool has_special_runtime_exit_condition() {
1259 // Because we don't use is_external_suspend_with_lock
1260 // it is possible that we won't see an asynchronous external suspend
1261 // request that has just gotten started, i.e., SR_lock grabbed but
1262 // _external_suspend field change either not made yet or not visible
1263 // yet. However, this is okay because the request is asynchronous and
1264 // we will see the new flag value the next time through. It's also
1265 // possible that the external suspend request is dropped after
1266 // we have checked is_external_suspend(), we will recheck its value
1267 // under SR_lock in java_suspend_self().
1268 return (_special_runtime_exit_condition != _no_async_condition) ||
1269 is_external_suspend() || is_deopt_suspend() || is_trace_suspend();
1270 }
1271
1272 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1273
1274 inline void set_pending_async_exception(oop e);
1275
1276 // Fast-locking support
1277 bool is_lock_owned(address adr) const;
1278
1279 // Accessors for vframe array top
1280 // The linked list of vframe arrays are sorted on sp. This means when we
1281 // unpack the head must contain the vframe array to unpack.
1282 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1283 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1284
1285 // Side structure for deferring update of java frame locals until deopt occurs
1286 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1287 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1288
1289 // These only really exist to make debugging deopt problems simpler
1290
1291 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1292 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1293
1294 // The special resourceMark used during deoptimization
1295
1296 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1297 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1298
1299 intptr_t* must_deopt_id() { return _must_deopt_id; }
1300 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1301 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1302
1303 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; }
1304 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; }
1305
1306 Method* callee_target() const { return _callee_target; }
1307 void set_callee_target (Method* x) { _callee_target = x; }
1308
1309 // Oop results of vm runtime calls
1310 oop vm_result() const { return _vm_result; }
1311 void set_vm_result (oop x) { _vm_result = x; }
1312
1313 Metadata* vm_result_2() const { return _vm_result_2; }
1314 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1315
1316 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1317 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1318
1319 #if INCLUDE_JVMCI
1320 int pending_deoptimization() const { return _pending_deoptimization; }
1321 oop pending_failed_speculation() const { return _pending_failed_speculation; }
1322 bool adjusting_comp_level() const { return _adjusting_comp_level; }
1323 void set_adjusting_comp_level(bool b) { _adjusting_comp_level = b; }
1324 bool has_pending_monitorenter() const { return _pending_monitorenter; }
1325 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
1326 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
1327 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; }
1328 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
1329 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
1330 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
1331 #endif // INCLUDE_JVMCI
1332
1333 // Exception handling for compiled methods
1334 oop exception_oop() const { return _exception_oop; }
1335 address exception_pc() const { return _exception_pc; }
1336 address exception_handler_pc() const { return _exception_handler_pc; }
1337 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1338
1339 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1340 void set_exception_pc(address a) { _exception_pc = a; }
1341 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1342 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1343
1344 void clear_exception_oop_and_pc() {
1345 set_exception_oop(NULL);
1346 set_exception_pc(NULL);
1347 }
1348
1349 // Stack overflow support
1350 //
1351 // (small addresses)
1352 //
1353 // -- <-- stack_end() ---
1354 // | |
1355 // | red pages |
1356 // | |
1357 // -- <-- stack_red_zone_base() |
1358 // | |
1359 // | guard
1360 // | yellow pages zone
1361 // | |
1362 // | |
1363 // -- <-- stack_yellow_zone_base() |
1364 // | |
1365 // | |
1366 // | reserved pages |
1367 // | |
1368 // -- <-- stack_reserved_zone_base() --- ---
1369 // /|\ shadow <-- stack_overflow_limit() (somewhere in here)
1370 // | zone
1371 // \|/ size
1372 // some untouched memory ---
1373 //
1374 //
1375 // --
1376 // |
1377 // | shadow zone
1378 // |
1379 // --
1380 // x frame n
1381 // --
1382 // x frame n-1
1383 // x
1384 // --
1385 // ...
1386 //
1387 // --
1388 // x frame 0
1389 // -- <-- stack_base()
1390 //
1391 // (large addresses)
1392 //
1393
1394 private:
1395 // These values are derived from flags StackRedPages, StackYellowPages,
1396 // StackReservedPages and StackShadowPages. The zone size is determined
1397 // ergonomically if page_size > 4K.
1398 static size_t _stack_red_zone_size;
1399 static size_t _stack_yellow_zone_size;
1400 static size_t _stack_reserved_zone_size;
1401 static size_t _stack_shadow_zone_size;
1402 public:
1403 inline size_t stack_available(address cur_sp);
1404
1405 static size_t stack_red_zone_size() {
1406 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized.");
1407 return _stack_red_zone_size;
1408 }
1409 static void set_stack_red_zone_size(size_t s) {
1410 assert(is_aligned(s, os::vm_page_size()),
1411 "We can not protect if the red zone size is not page aligned.");
1412 assert(_stack_red_zone_size == 0, "This should be called only once.");
1413 _stack_red_zone_size = s;
1414 }
1415 address stack_red_zone_base() {
1416 return (address)(stack_end() + stack_red_zone_size());
1417 }
1418 bool in_stack_red_zone(address a) {
1419 return a <= stack_red_zone_base() && a >= stack_end();
1420 }
1421
1422 static size_t stack_yellow_zone_size() {
1423 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized.");
1424 return _stack_yellow_zone_size;
1425 }
1426 static void set_stack_yellow_zone_size(size_t s) {
1427 assert(is_aligned(s, os::vm_page_size()),
1428 "We can not protect if the yellow zone size is not page aligned.");
1429 assert(_stack_yellow_zone_size == 0, "This should be called only once.");
1430 _stack_yellow_zone_size = s;
1431 }
1432
1433 static size_t stack_reserved_zone_size() {
1434 // _stack_reserved_zone_size may be 0. This indicates the feature is off.
1435 return _stack_reserved_zone_size;
1436 }
1437 static void set_stack_reserved_zone_size(size_t s) {
1438 assert(is_aligned(s, os::vm_page_size()),
1439 "We can not protect if the reserved zone size is not page aligned.");
1440 assert(_stack_reserved_zone_size == 0, "This should be called only once.");
1441 _stack_reserved_zone_size = s;
1442 }
1443 address stack_reserved_zone_base() {
1444 return (address)(stack_end() +
1445 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size()));
1446 }
1447 bool in_stack_reserved_zone(address a) {
1448 return (a <= stack_reserved_zone_base()) &&
1449 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size()));
1450 }
1451
1452 static size_t stack_yellow_reserved_zone_size() {
1453 return _stack_yellow_zone_size + _stack_reserved_zone_size;
1454 }
1455 bool in_stack_yellow_reserved_zone(address a) {
1456 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base());
1457 }
1458
1459 // Size of red + yellow + reserved zones.
1460 static size_t stack_guard_zone_size() {
1461 return stack_red_zone_size() + stack_yellow_reserved_zone_size();
1462 }
1463
1464 static size_t stack_shadow_zone_size() {
1465 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized.");
1466 return _stack_shadow_zone_size;
1467 }
1468 static void set_stack_shadow_zone_size(size_t s) {
1469 // The shadow area is not allocated or protected, so
1470 // it needs not be page aligned.
1471 // But the stack bang currently assumes that it is a
1472 // multiple of page size. This guarantees that the bang
1473 // loop touches all pages in the shadow zone.
1474 // This can be guaranteed differently, as well. E.g., if
1475 // the page size is a multiple of 4K, banging in 4K steps
1476 // suffices to touch all pages. (Some pages are banged
1477 // several times, though.)
1478 assert(is_aligned(s, os::vm_page_size()),
1479 "Stack bang assumes multiple of page size.");
1480 assert(_stack_shadow_zone_size == 0, "This should be called only once.");
1481 _stack_shadow_zone_size = s;
1482 }
1483
1484 void create_stack_guard_pages();
1485 void remove_stack_guard_pages();
1486
1487 void enable_stack_reserved_zone();
1488 void disable_stack_reserved_zone();
1489 void enable_stack_yellow_reserved_zone();
1490 void disable_stack_yellow_reserved_zone();
1491 void enable_stack_red_zone();
1492 void disable_stack_red_zone();
1493
1494 inline bool stack_guard_zone_unused();
1495 inline bool stack_yellow_reserved_zone_disabled();
1496 inline bool stack_reserved_zone_disabled();
1497 inline bool stack_guards_enabled();
1498
1499 address reserved_stack_activation() const { return _reserved_stack_activation; }
1500 void set_reserved_stack_activation(address addr) {
1501 assert(_reserved_stack_activation == stack_base()
1502 || _reserved_stack_activation == NULL
1503 || addr == stack_base(), "Must not be set twice");
1504 _reserved_stack_activation = addr;
1505 }
1506
1507 // Attempt to reguard the stack after a stack overflow may have occurred.
1508 // Returns true if (a) guard pages are not needed on this thread, (b) the
1509 // pages are already guarded, or (c) the pages were successfully reguarded.
1510 // Returns false if there is not enough stack space to reguard the pages, in
1511 // which case the caller should unwind a frame and try again. The argument
1512 // should be the caller's (approximate) sp.
1513 bool reguard_stack(address cur_sp);
1514 // Similar to above but see if current stackpoint is out of the guard area
1515 // and reguard if possible.
1516 bool reguard_stack(void);
1517
1518 address stack_overflow_limit() { return _stack_overflow_limit; }
1519 void set_stack_overflow_limit() {
1520 _stack_overflow_limit =
1521 stack_end() + MAX2(JavaThread::stack_guard_zone_size(), JavaThread::stack_shadow_zone_size());
1522 }
1523
1524 // Misc. accessors/mutators
1525 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1526 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1527 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1528
1529 #ifndef PRODUCT
1530 void record_jump(address target, address instr, const char* file, int line);
1531 #endif // PRODUCT
1532
1533 // For assembly stub generation
1534 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1535 #ifndef PRODUCT
1536 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1537 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1538 #endif // PRODUCT
1539 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1540 static ByteSize pending_jni_exception_check_fn_offset() {
1541 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn);
1542 }
1543 static ByteSize last_Java_sp_offset() {
1544 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1545 }
1546 static ByteSize last_Java_pc_offset() {
1547 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1548 }
1549 static ByteSize frame_anchor_offset() {
1550 return byte_offset_of(JavaThread, _anchor);
1551 }
1552 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1553 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1554 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1555 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1556 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1557 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1558 #if INCLUDE_JVMCI
1559 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
1560 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
1561 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); }
1562 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
1563 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
1564 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
1565 #endif // INCLUDE_JVMCI
1566 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1567 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1568 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1569 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1570 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1571 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1572 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); }
1573 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1574
1575 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1576 static ByteSize should_post_on_exceptions_flag_offset() {
1577 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1578 }
1579
1580 #if INCLUDE_ALL_GCS
1581 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1582 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1583 #endif // INCLUDE_ALL_GCS
1584
1585 // Returns the jni environment for this thread
1586 JNIEnv* jni_environment() { return &_jni_environment; }
1587
1588 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1589 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1590 // Only return NULL if thread is off the thread list; starting to
1591 // exit should not return NULL.
1592 if (thread_from_jni_env->is_terminated()) {
1593 thread_from_jni_env->block_if_vm_exited();
1594 return NULL;
1595 } else {
1596 return thread_from_jni_env;
1597 }
1598 }
1599
1600 // JNI critical regions. These can nest.
1601 bool in_critical() { return _jni_active_critical > 0; }
1602 bool in_last_critical() { return _jni_active_critical == 1; }
1603 void enter_critical() {
1604 assert(Thread::current() == this ||
1605 (Thread::current()->is_VM_thread() &&
1606 SafepointSynchronize::is_synchronizing()),
1607 "this must be current thread or synchronizing");
1608 _jni_active_critical++;
1609 }
1610 void exit_critical() {
1611 assert(Thread::current() == this, "this must be current thread");
1612 _jni_active_critical--;
1613 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1614 }
1615
1616 // Checked JNI: is the programmer required to check for exceptions, if so specify
1617 // which function name. Returning to a Java frame should implicitly clear the
1618 // pending check, this is done for Native->Java transitions (i.e. user JNI code).
1619 // VM->Java transistions are not cleared, it is expected that JNI code enclosed
1620 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal).
1621 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1622 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1623 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1624 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1625
1626 // For deadlock detection
1627 int depth_first_number() { return _depth_first_number; }
1628 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1629
1630 private:
1631 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1632
1633 public:
1634 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1635 void add_monitor_chunk(MonitorChunk* chunk);
1636 void remove_monitor_chunk(MonitorChunk* chunk);
1637 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1638 void inc_in_deopt_handler() { _in_deopt_handler++; }
1639 void dec_in_deopt_handler() {
1640 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1641 if (_in_deopt_handler > 0) { // robustness
1642 _in_deopt_handler--;
1643 }
1644 }
1645
1646 private:
1647 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1648
1649 public:
1650
1651 // Frame iteration; calls the function f for all frames on the stack
1652 void frames_do(void f(frame*, const RegisterMap*));
1653
1654 // Memory operations
1655 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1656
1657 // Sweeper operations
1658 virtual void nmethods_do(CodeBlobClosure* cf);
1659
1660 // RedefineClasses Support
1661 void metadata_do(void f(Metadata*));
1662
1663 // Misc. operations
1664 char* name() const { return (char*)get_thread_name(); }
1665 void print_on(outputStream* st) const;
1666 void print_value();
1667 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1668 void print_thread_state() const PRODUCT_RETURN;
1669 void print_on_error(outputStream* st, char* buf, int buflen) const;
1670 void print_name_on_error(outputStream* st, char* buf, int buflen) const;
1671 void verify();
1672 const char* get_thread_name() const;
1673 private:
1674 // factor out low-level mechanics for use in both normal and error cases
1675 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1676 public:
1677 const char* get_threadgroup_name() const;
1678 const char* get_parent_name() const;
1679
1680 // Accessing frames
1681 frame last_frame() {
1682 _anchor.make_walkable(this);
1683 return pd_last_frame();
1684 }
1685 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1686
1687 // Returns method at 'depth' java or native frames down the stack
1688 // Used for security checks
1689 Klass* security_get_caller_class(int depth);
1690
1691 // Print stack trace in external format
1692 void print_stack_on(outputStream* st);
1693 void print_stack() { print_stack_on(tty); }
1694
1695 // Print stack traces in various internal formats
1696 void trace_stack() PRODUCT_RETURN;
1697 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1698 void trace_frames() PRODUCT_RETURN;
1699 void trace_oops() PRODUCT_RETURN;
1700
1701 // Print an annotated view of the stack frames
1702 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1703 void validate_frame_layout() {
1704 print_frame_layout(0, true);
1705 }
1706
1707 // Returns the number of stack frames on the stack
1708 int depth() const;
1709
1710 // Function for testing deoptimization
1711 void deoptimize();
1712 void make_zombies();
1713
1714 void deoptimized_wrt_marked_nmethods();
1715
1716 // Profiling operation (see fprofile.cpp)
1717 public:
1718 bool profile_last_Java_frame(frame* fr);
1719
1720 private:
1721 ThreadProfiler* _thread_profiler;
1722 private:
1723 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1724 friend class FlatProfilerTask; // uses get_thread_profiler.
1725 friend class ThreadProfilerMark; // uses get_thread_profiler.
1726 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1727 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1728 ThreadProfiler* result = _thread_profiler;
1729 _thread_profiler = tp;
1730 return result;
1731 }
1732
1733 public:
1734 // Returns the running thread as a JavaThread
1735 static inline JavaThread* current();
1736
1737 // Returns the active Java thread. Do not use this if you know you are calling
1738 // from a JavaThread, as it's slower than JavaThread::current. If called from
1739 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1740 // operation. You may not want that either.
1741 static JavaThread* active();
1742
1743 inline CompilerThread* as_CompilerThread();
1744
1745 public:
1746 virtual void run();
1747 void thread_main_inner();
1748
1749 private:
1750 // PRIVILEGED STACK
1751 PrivilegedElement* _privileged_stack_top;
1752 GrowableArray<oop>* _array_for_gc;
1753 public:
1754
1755 // Returns the privileged_stack information.
1756 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1757 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1758 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1759
1760 public:
1761 // Thread local information maintained by JVMTI.
1762 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1763 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1764 // getter is used to get this JavaThread's JvmtiThreadState if it has
1765 // one which means NULL can be returned. JvmtiThreadState::state_for()
1766 // is used to get the specified JavaThread's JvmtiThreadState if it has
1767 // one or it allocates a new JvmtiThreadState for the JavaThread and
1768 // returns it. JvmtiThreadState::state_for() will return NULL only if
1769 // the specified JavaThread is exiting.
1770 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1771 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1772 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1773 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1774
1775 // JVMTI PopFrame support
1776 // Setting and clearing popframe_condition
1777 // All of these enumerated values are bits. popframe_pending
1778 // indicates that a PopFrame() has been requested and not yet been
1779 // completed. popframe_processing indicates that that PopFrame() is in
1780 // the process of being completed. popframe_force_deopt_reexecution_bit
1781 // indicates that special handling is required when returning to a
1782 // deoptimized caller.
1783 enum PopCondition {
1784 popframe_inactive = 0x00,
1785 popframe_pending_bit = 0x01,
1786 popframe_processing_bit = 0x02,
1787 popframe_force_deopt_reexecution_bit = 0x04
1788 };
1789 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1790 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1791 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1792 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1793 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1794 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1795 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1796 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1797 #ifdef CC_INTERP
1798 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1799 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1800 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1801 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1802 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1803 #endif
1804
1805 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1806 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1807 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1808
1809 private:
1810 // Saved incoming arguments to popped frame.
1811 // Used only when popped interpreted frame returns to deoptimized frame.
1812 void* _popframe_preserved_args;
1813 int _popframe_preserved_args_size;
1814
1815 public:
1816 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1817 void* popframe_preserved_args();
1818 ByteSize popframe_preserved_args_size();
1819 WordSize popframe_preserved_args_size_in_words();
1820 void popframe_free_preserved_args();
1821
1822
1823 private:
1824 JvmtiThreadState *_jvmti_thread_state;
1825 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1826
1827 // Used by the interpreter in fullspeed mode for frame pop, method
1828 // entry, method exit and single stepping support. This field is
1829 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1830 // It can be set to zero asynchronously (i.e., without a VM operation
1831 // or a lock) so we have to be very careful.
1832 int _interp_only_mode;
1833
1834 public:
1835 // used by the interpreter for fullspeed debugging support (see above)
1836 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1837 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1838 int get_interp_only_mode() { return _interp_only_mode; }
1839 void increment_interp_only_mode() { ++_interp_only_mode; }
1840 void decrement_interp_only_mode() { --_interp_only_mode; }
1841
1842 // support for cached flag that indicates whether exceptions need to be posted for this thread
1843 // if this is false, we can avoid deoptimizing when events are thrown
1844 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1845 private:
1846 int _should_post_on_exceptions_flag;
1847
1848 public:
1849 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1850 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1851
1852 private:
1853 ThreadStatistics *_thread_stat;
1854
1855 public:
1856 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1857
1858 // Return a blocker object for which this thread is blocked parking.
1859 oop current_park_blocker();
1860
1861 private:
1862 static size_t _stack_size_at_create;
1863
1864 public:
1865 static inline size_t stack_size_at_create(void) {
1866 return _stack_size_at_create;
1867 }
1868 static inline void set_stack_size_at_create(size_t value) {
1869 _stack_size_at_create = value;
1870 }
1871
1872 #if INCLUDE_ALL_GCS
1873 // SATB marking queue support
1874 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; }
1875 static SATBMarkQueueSet& satb_mark_queue_set() {
1876 return _satb_mark_queue_set;
1877 }
1878
1879 // Dirty card queue support
1880 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1881 static DirtyCardQueueSet& dirty_card_queue_set() {
1882 return _dirty_card_queue_set;
1883 }
1884 #endif // INCLUDE_ALL_GCS
1885
1886 // This method initializes the SATB and dirty card queues before a
1887 // JavaThread is added to the Java thread list. Right now, we don't
1888 // have to do anything to the dirty card queue (it should have been
1889 // activated when the thread was created), but we have to activate
1890 // the SATB queue if the thread is created while a marking cycle is
1891 // in progress. The activation / de-activation of the SATB queues at
1892 // the beginning / end of a marking cycle is done during safepoints
1893 // so we have to make sure this method is called outside one to be
1894 // able to safely read the active field of the SATB queue set. Right
1895 // now, it is called just before the thread is added to the Java
1896 // thread list in the Threads::add() method. That method is holding
1897 // the Threads_lock which ensures we are outside a safepoint. We
1898 // cannot do the obvious and set the active field of the SATB queue
1899 // when the thread is created given that, in some cases, safepoints
1900 // might happen between the JavaThread constructor being called and the
1901 // thread being added to the Java thread list (an example of this is
1902 // when the structure for the DestroyJavaVM thread is created).
1903 #if INCLUDE_ALL_GCS
1904 void initialize_queues();
1905 #else // INCLUDE_ALL_GCS
1906 void initialize_queues() { }
1907 #endif // INCLUDE_ALL_GCS
1908
1909 // Machine dependent stuff
1910 #include OS_CPU_HEADER(thread)
1911
1912 public:
1913 void set_blocked_on_compilation(bool value) {
1914 _blocked_on_compilation = value;
1915 }
1916
1917 bool blocked_on_compilation() {
1918 return _blocked_on_compilation;
1919 }
1920 protected:
1921 bool _blocked_on_compilation;
1922
1923
1924 // JSR166 per-thread parker
1925 private:
1926 Parker* _parker;
1927 public:
1928 Parker* parker() { return _parker; }
1929
1930 // Biased locking support
1931 private:
1932 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1933 public:
1934 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1935 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1936
1937 // clearing/querying jni attach status
1938 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1939 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1940 inline void set_done_attaching_via_jni();
1941 };
1942
1943 // Inline implementation of JavaThread::current
1944 inline JavaThread* JavaThread::current() {
1945 Thread* thread = Thread::current();
1946 assert(thread->is_Java_thread(), "just checking");
1947 return (JavaThread*)thread;
1948 }
1949
1950 inline CompilerThread* JavaThread::as_CompilerThread() {
1951 assert(is_Compiler_thread(), "just checking");
1952 return (CompilerThread*)this;
1953 }
1954
1955 // Dedicated thread to sweep the code cache
1956 class CodeCacheSweeperThread : public JavaThread {
1957 CompiledMethod* _scanned_compiled_method; // nmethod being scanned by the sweeper
1958 public:
1959 CodeCacheSweeperThread();
1960 // Track the nmethod currently being scanned by the sweeper
1961 void set_scanned_compiled_method(CompiledMethod* cm) {
1962 assert(_scanned_compiled_method == NULL || cm == NULL, "should reset to NULL before writing a new value");
1963 _scanned_compiled_method = cm;
1964 }
1965
1966 // Hide sweeper thread from external view.
1967 bool is_hidden_from_external_view() const { return true; }
1968
1969 bool is_Code_cache_sweeper_thread() const { return true; }
1970
1971 // Prevent GC from unloading _scanned_compiled_method
1972 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1973 void nmethods_do(CodeBlobClosure* cf);
1974 };
1975
1976 // A thread used for Compilation.
1977 class CompilerThread : public JavaThread {
1978 friend class VMStructs;
1979 private:
1980 CompilerCounters* _counters;
1981
1982 ciEnv* _env;
1983 CompileLog* _log;
1984 CompileTask* _task;
1985 CompileQueue* _queue;
1986 BufferBlob* _buffer_blob;
1987
1988 AbstractCompiler* _compiler;
1989
1990 public:
1991
1992 static CompilerThread* current();
1993
1994 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1995
1996 bool is_Compiler_thread() const { return true; }
1997
1998 virtual bool can_call_java() const;
1999
2000 // Hide native compiler threads from external view.
2001 bool is_hidden_from_external_view() const { return !can_call_java(); }
2002
2003 void set_compiler(AbstractCompiler* c) { _compiler = c; }
2004 AbstractCompiler* compiler() const { return _compiler; }
2005
2006 CompileQueue* queue() const { return _queue; }
2007 CompilerCounters* counters() const { return _counters; }
2008
2009 // Get/set the thread's compilation environment.
2010 ciEnv* env() { return _env; }
2011 void set_env(ciEnv* env) { _env = env; }
2012
2013 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
2014 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
2015
2016 // Get/set the thread's logging information
2017 CompileLog* log() { return _log; }
2018 void init_log(CompileLog* log) {
2019 // Set once, for good.
2020 assert(_log == NULL, "set only once");
2021 _log = log;
2022 }
2023
2024 #ifndef PRODUCT
2025 private:
2026 IdealGraphPrinter *_ideal_graph_printer;
2027 public:
2028 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
2029 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
2030 #endif
2031
2032 // Get/set the thread's current task
2033 CompileTask* task() { return _task; }
2034 void set_task(CompileTask* task) { _task = task; }
2035 };
2036
2037 inline CompilerThread* CompilerThread::current() {
2038 return JavaThread::current()->as_CompilerThread();
2039 }
2040
2041 // The active thread queue. It also keeps track of the current used
2042 // thread priorities.
2043 class Threads: AllStatic {
2044 friend class VMStructs;
2045 private:
2046 static JavaThread* _thread_list;
2047 static int _number_of_threads;
2048 static int _number_of_non_daemon_threads;
2049 static int _return_code;
2050 static int _thread_claim_parity;
2051 #ifdef ASSERT
2052 static bool _vm_complete;
2053 #endif
2054
2055 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
2056 static void initialize_jsr292_core_classes(TRAPS);
2057 public:
2058 // Thread management
2059 // force_daemon is a concession to JNI, where we may need to add a
2060 // thread to the thread list before allocating its thread object
2061 static void add(JavaThread* p, bool force_daemon = false);
2062 static void remove(JavaThread* p);
2063 static bool includes(JavaThread* p);
2064 static JavaThread* first() { return _thread_list; }
2065 static void threads_do(ThreadClosure* tc);
2066 static void parallel_java_threads_do(ThreadClosure* tc);
2067
2068 // Initializes the vm and creates the vm thread
2069 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
2070 static void convert_vm_init_libraries_to_agents();
2071 static void create_vm_init_libraries();
2072 static void create_vm_init_agents();
2073 static void shutdown_vm_agents();
2074 static bool destroy_vm();
2075 // Supported VM versions via JNI
2076 // Includes JNI_VERSION_1_1
2077 static jboolean is_supported_jni_version_including_1_1(jint version);
2078 // Does not include JNI_VERSION_1_1
2079 static jboolean is_supported_jni_version(jint version);
2080
2081 // The "thread claim parity" provides a way for threads to be claimed
2082 // by parallel worker tasks.
2083 //
2084 // Each thread contains a a "parity" field. A task will claim the
2085 // thread only if its parity field is the same as the global parity,
2086 // which is updated by calling change_thread_claim_parity().
2087 //
2088 // For this to work change_thread_claim_parity() needs to be called
2089 // exactly once in sequential code before starting parallel tasks
2090 // that should claim threads.
2091 //
2092 // New threads get their parity set to 0 and change_thread_claim_parity()
2093 // never set the global parity to 0.
2094 static int thread_claim_parity() { return _thread_claim_parity; }
2095 static void change_thread_claim_parity();
2096 static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
2097
2098 // Apply "f->do_oop" to all root oops in all threads.
2099 // This version may only be called by sequential code.
2100 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
2101 // This version may be called by sequential or parallel code.
2102 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf);
2103 // This creates a list of GCTasks, one per thread.
2104 static void create_thread_roots_tasks(GCTaskQueue* q);
2105 // This creates a list of GCTasks, one per thread, for marking objects.
2106 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
2107
2108 // Apply "f->do_oop" to roots in all threads that
2109 // are part of compiled frames
2110 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
2111
2112 static void convert_hcode_pointers();
2113 static void restore_hcode_pointers();
2114
2115 // Sweeper
2116 static void nmethods_do(CodeBlobClosure* cf);
2117
2118 // RedefineClasses support
2119 static void metadata_do(void f(Metadata*));
2120 static void metadata_handles_do(void f(Metadata*));
2121
2122 #ifdef ASSERT
2123 static bool is_vm_complete() { return _vm_complete; }
2124 #endif
2125
2126 // Verification
2127 static void verify();
2128 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
2129 static void print(bool print_stacks, bool internal_format) {
2130 // this function is only used by debug.cpp
2131 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
2132 }
2133 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2134 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf,
2135 int buflen, bool* found_current);
2136 static void print_threads_compiling(outputStream* st, char* buf, int buflen);
2137
2138 // Get Java threads that are waiting to enter a monitor. If doLock
2139 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2140 // VM needs to be at a safepoint.
2141 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2142 address monitor, bool doLock);
2143
2144 // Get owning Java thread from the monitor's owner field. If doLock
2145 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2146 // VM needs to be at a safepoint.
2147 static JavaThread *owning_thread_from_monitor_owner(address owner,
2148 bool doLock);
2149
2150 // Number of threads on the active threads list
2151 static int number_of_threads() { return _number_of_threads; }
2152 // Number of non-daemon threads on the active threads list
2153 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2154
2155 // Deoptimizes all frames tied to marked nmethods
2156 static void deoptimized_wrt_marked_nmethods();
2157
2158 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2159
2160 };
2161
2162
2163 // Thread iterator
2164 class ThreadClosure: public StackObj {
2165 public:
2166 virtual void do_thread(Thread* thread) = 0;
2167 };
2168
2169 class SignalHandlerMark: public StackObj {
2170 private:
2171 Thread* _thread;
2172 public:
2173 SignalHandlerMark(Thread* t) {
2174 _thread = t;
2175 if (_thread) _thread->enter_signal_handler();
2176 }
2177 ~SignalHandlerMark() {
2178 if (_thread) _thread->leave_signal_handler();
2179 _thread = NULL;
2180 }
2181 };
2182
2183
2184 #endif // SHARE_VM_RUNTIME_THREAD_HPP