1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 #define SHARE_VM_RUNTIME_THREAD_HPP
27
28 #include "memory/allocation.hpp"
29 #include "memory/threadLocalAllocBuffer.hpp"
30 #include "oops/oop.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvmtiExport.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/javaFrameAnchor.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/mutexLocker.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/osThread.hpp"
39 #include "runtime/park.hpp"
40 #include "runtime/safepoint.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "runtime/threadLocalStorage.hpp"
43 #include "runtime/thread_ext.hpp"
44 #include "runtime/unhandledOops.hpp"
45 #include "utilities/exceptions.hpp"
46 #include "utilities/macros.hpp"
47 #include "utilities/top.hpp"
48 #if INCLUDE_ALL_GCS
49 #include "gc_implementation/g1/dirtyCardQueue.hpp"
50 #include "gc_implementation/g1/satbQueue.hpp"
51 #endif // INCLUDE_ALL_GCS
52 #ifdef TARGET_ARCH_zero
53 # include "stack_zero.hpp"
54 #endif
55 #if INCLUDE_JFR
56 #include "jfr/support/jfrThreadExtension.hpp"
57 #endif
58
59 class ThreadSafepointState;
60 class ThreadProfiler;
61
62 class JvmtiThreadState;
63 class JvmtiGetLoadedClassesClosure;
64 class ThreadStatistics;
65 class ConcurrentLocksDump;
66 class ParkEvent;
67 class Parker;
68
69 class ciEnv;
70 class CompileThread;
71 class CompileLog;
72 class CompileTask;
73 class CompileQueue;
74 class CompilerCounters;
75 class vframeArray;
76
77 class DeoptResourceMark;
78 class jvmtiDeferredLocalVariableSet;
79
80 class GCTaskQueue;
81 class ThreadClosure;
82 class IdealGraphPrinter;
83
84 class Metadata;
85 template <class T, MEMFLAGS F> class ChunkedList;
86 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
87
88 DEBUG_ONLY(class ResourceMark;)
89
90 class WorkerThread;
91
92 // Class hierarchy
93 // - Thread
94 // - NamedThread
95 // - VMThread
96 // - ConcurrentGCThread
97 // - WorkerThread
98 // - GangWorker
99 // - GCTaskThread
100 // - JavaThread
101 // - WatcherThread
102
103 class Thread: public ThreadShadow {
104 friend class VMStructs;
105 private:
106 // Exception handling
107 // (Note: _pending_exception and friends are in ThreadShadow)
108 //oop _pending_exception; // pending exception for current thread
109 // const char* _exception_file; // file information for exception (debugging only)
110 // int _exception_line; // line information for exception (debugging only)
111 protected:
112 // Support for forcing alignment of thread objects for biased locking
113 void* _real_malloc_address;
114 public:
115 void* operator new(size_t size) throw() { return allocate(size, true); }
116 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
117 return allocate(size, false); }
118 void operator delete(void* p);
119
120 protected:
121 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
122 private:
123
124 // ***************************************************************
125 // Suspend and resume support
126 // ***************************************************************
127 //
128 // VM suspend/resume no longer exists - it was once used for various
129 // things including safepoints but was deprecated and finally removed
130 // in Java 7. Because VM suspension was considered "internal" Java-level
131 // suspension was considered "external", and this legacy naming scheme
132 // remains.
133 //
134 // External suspend/resume requests come from JVM_SuspendThread,
135 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
136 // ResumeThread. External
137 // suspend requests cause _external_suspend to be set and external
138 // resume requests cause _external_suspend to be cleared.
139 // External suspend requests do not nest on top of other external
140 // suspend requests. The higher level APIs reject suspend requests
141 // for already suspended threads.
142 //
143 // The external_suspend
144 // flag is checked by has_special_runtime_exit_condition() and java thread
145 // will self-suspend when handle_special_runtime_exit_condition() is
146 // called. Most uses of the _thread_blocked state in JavaThreads are
147 // considered the same as being externally suspended; if the blocking
148 // condition lifts, the JavaThread will self-suspend. Other places
149 // where VM checks for external_suspend include:
150 // + mutex granting (do not enter monitors when thread is suspended)
151 // + state transitions from _thread_in_native
152 //
153 // In general, java_suspend() does not wait for an external suspend
154 // request to complete. When it returns, the only guarantee is that
155 // the _external_suspend field is true.
156 //
157 // wait_for_ext_suspend_completion() is used to wait for an external
158 // suspend request to complete. External suspend requests are usually
159 // followed by some other interface call that requires the thread to
160 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
161 // the interface that requires quiescence, we give the JavaThread a
162 // chance to self-suspend before we need it to be quiescent. This
163 // improves overall suspend/query performance.
164 //
165 // _suspend_flags controls the behavior of java_ suspend/resume.
166 // It must be set under the protection of SR_lock. Read from the flag is
167 // OK without SR_lock as long as the value is only used as a hint.
168 // (e.g., check _external_suspend first without lock and then recheck
169 // inside SR_lock and finish the suspension)
170 //
171 // _suspend_flags is also overloaded for other "special conditions" so
172 // that a single check indicates whether any special action is needed
173 // eg. for async exceptions.
174 // -------------------------------------------------------------------
175 // Notes:
176 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
177 // but we still update its value to keep other part of the system (mainly
178 // JVMTI) happy. ThreadState is legacy code (see notes in
179 // osThread.hpp).
180 //
181 // 2. It would be more natural if set_external_suspend() is private and
182 // part of java_suspend(), but that probably would affect the suspend/query
183 // performance. Need more investigation on this.
184 //
185
186 // suspend/resume lock: used for self-suspend
187 Monitor* _SR_lock;
188
189 protected:
190 enum SuspendFlags {
191 // NOTE: avoid using the sign-bit as cc generates different test code
192 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
193
194 _external_suspend = 0x20000000U, // thread is asked to self suspend
195 _ext_suspended = 0x40000000U, // thread has self-suspended
196 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
197
198 _has_async_exception = 0x00000001U, // there is a pending async exception
199 _critical_native_unlock = 0x00000002U, // Must call back to unlock JNI critical lock
200
201 JFR_ONLY(_trace_flag = 0x00000004U) // call jfr tracing
202 };
203
204 // various suspension related flags - atomically updated
205 // overloaded for async exception checking in check_special_condition_for_native_trans.
206 volatile uint32_t _suspend_flags;
207
208 private:
209 int _num_nested_signal;
210
211 public:
212 void enter_signal_handler() { _num_nested_signal++; }
213 void leave_signal_handler() { _num_nested_signal--; }
214 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
215
216 private:
217 // Debug tracing
218 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
219
220 // Active_handles points to a block of handles
221 JNIHandleBlock* _active_handles;
222
223 // One-element thread local free list
224 JNIHandleBlock* _free_handle_block;
225
226 // Point to the last handle mark
227 HandleMark* _last_handle_mark;
228
229 // The parity of the last strong_roots iteration in which this thread was
230 // claimed as a task.
231 jint _oops_do_parity;
232
233 public:
234 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
235 HandleMark* last_handle_mark() const { return _last_handle_mark; }
236 private:
237
238 // debug support for checking if code does allow safepoints or not
239 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
240 // mutex, or blocking on an object synchronizer (Java locking).
241 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
242 // If !allow_allocation(), then an assertion failure will happen during allocation
243 // (Hence, !allow_safepoint() => !allow_allocation()).
244 //
245 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
246 //
247 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
248 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
249
250 // Used by SkipGCALot class.
251 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
252
253 friend class No_Alloc_Verifier;
254 friend class No_Safepoint_Verifier;
255 friend class Pause_No_Safepoint_Verifier;
256 friend class ThreadLocalStorage;
257 friend class GC_locker;
258
259 ThreadLocalAllocBuffer _tlab; // Thread-local eden
260 jlong _allocated_bytes; // Cumulative number of bytes allocated on
261 // the Java heap
262
263 // Thread-local buffer used by MetadataOnStackMark.
264 MetadataOnStackBuffer* _metadata_on_stack_buffer;
265
266 JFR_ONLY(DEFINE_THREAD_LOCAL_FIELD_JFR;) // Thread-local data for jfr
267
268 ThreadExt _ext;
269
270 int _vm_operation_started_count; // VM_Operation support
271 int _vm_operation_completed_count; // VM_Operation support
272
273 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
274 // is waiting to lock
275 bool _current_pending_monitor_is_from_java; // locking is from Java code
276
277 // ObjectMonitor on which this thread called Object.wait()
278 ObjectMonitor* _current_waiting_monitor;
279
280 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
281 public:
282 ObjectMonitor* omFreeList;
283 int omFreeCount; // length of omFreeList
284 int omFreeProvision; // reload chunk size
285 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
286 int omInUseCount; // length of omInUseList
287
288 #ifdef ASSERT
289 private:
290 bool _visited_for_critical_count;
291
292 public:
293 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
294 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
295 #endif
296
297 public:
298 enum {
299 is_definitely_current_thread = true
300 };
301
302 // Constructor
303 Thread();
304 virtual ~Thread();
305
306 // initializtion
307 void initialize_thread_local_storage();
308
309 // thread entry point
310 virtual void run();
311
312 // Testers
313 virtual bool is_VM_thread() const { return false; }
314 virtual bool is_Java_thread() const { return false; }
315 virtual bool is_Compiler_thread() const { return false; }
316 virtual bool is_hidden_from_external_view() const { return false; }
317 virtual bool is_jvmti_agent_thread() const { return false; }
318 // True iff the thread can perform GC operations at a safepoint.
319 // Generally will be true only of VM thread and parallel GC WorkGang
320 // threads.
321 virtual bool is_GC_task_thread() const { return false; }
322 virtual bool is_Watcher_thread() const { return false; }
323 virtual bool is_ConcurrentGC_thread() const { return false; }
324 virtual bool is_Named_thread() const { return false; }
325 virtual bool is_Worker_thread() const { return false; }
326
327 // Casts
328 virtual WorkerThread* as_Worker_thread() const { return NULL; }
329
330 virtual char* name() const { return (char*)"Unknown thread"; }
331
332 // Returns the current thread
333 static inline Thread* current();
334
335 // Common thread operations
336 static void set_priority(Thread* thread, ThreadPriority priority);
337 static ThreadPriority get_priority(const Thread* const thread);
338 static void start(Thread* thread);
339 static void interrupt(Thread* thr);
340 static bool is_interrupted(Thread* thr, bool clear_interrupted);
341
342 void set_native_thread_name(const char *name) {
343 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
344 os::set_native_thread_name(name);
345 }
346
347 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
348 Monitor* SR_lock() const { return _SR_lock; }
349
350 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
351
352 void set_suspend_flag(SuspendFlags f) {
353 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
354 uint32_t flags;
355 do {
356 flags = _suspend_flags;
357 }
358 while (Atomic::cmpxchg((jint)(flags | f),
359 (volatile jint*)&_suspend_flags,
360 (jint)flags) != (jint)flags);
361 }
362 void clear_suspend_flag(SuspendFlags f) {
363 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
364 uint32_t flags;
365 do {
366 flags = _suspend_flags;
367 }
368 while (Atomic::cmpxchg((jint)(flags & ~f),
369 (volatile jint*)&_suspend_flags,
370 (jint)flags) != (jint)flags);
371 }
372
373 void set_has_async_exception() {
374 set_suspend_flag(_has_async_exception);
375 }
376 void clear_has_async_exception() {
377 clear_suspend_flag(_has_async_exception);
378 }
379
380 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
381
382 void set_critical_native_unlock() {
383 set_suspend_flag(_critical_native_unlock);
384 }
385 void clear_critical_native_unlock() {
386 clear_suspend_flag(_critical_native_unlock);
387 }
388
389 // Support for Unhandled Oop detection
390 #ifdef CHECK_UNHANDLED_OOPS
391 private:
392 UnhandledOops* _unhandled_oops;
393 public:
394 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
395 // Mark oop safe for gc. It may be stack allocated but won't move.
396 void allow_unhandled_oop(oop *op) {
397 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
398 }
399 // Clear oops at safepoint so crashes point to unhandled oop violator
400 void clear_unhandled_oops() {
401 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
402 }
403 #endif // CHECK_UNHANDLED_OOPS
404
405 #ifndef PRODUCT
406 bool skip_gcalot() { return _skip_gcalot; }
407 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
408 #endif
409
410 public:
411 // Installs a pending exception to be inserted later
412 static void send_async_exception(oop thread_oop, oop java_throwable);
413
414 // Resource area
415 ResourceArea* resource_area() const { return _resource_area; }
416 void set_resource_area(ResourceArea* area) { _resource_area = area; }
417
418 OSThread* osthread() const { return _osthread; }
419 void set_osthread(OSThread* thread) { _osthread = thread; }
420
421 // JNI handle support
422 JNIHandleBlock* active_handles() const { return _active_handles; }
423 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
424 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
425 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
426
427 // Internal handle support
428 HandleArea* handle_area() const { return _handle_area; }
429 void set_handle_area(HandleArea* area) { _handle_area = area; }
430
431 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
432 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
433
434 // Thread-Local Allocation Buffer (TLAB) support
435 ThreadLocalAllocBuffer& tlab() { return _tlab; }
436 void initialize_tlab() {
437 if (UseTLAB) {
438 tlab().initialize();
439 }
440 }
441
442 jlong allocated_bytes() { return _allocated_bytes; }
443 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
444 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
445 inline jlong cooked_allocated_bytes();
446
447 JFR_ONLY(DEFINE_THREAD_LOCAL_ACCESSOR_JFR;)
448 JFR_ONLY(DEFINE_TRACE_SUSPEND_FLAG_METHODS)
449
450 const ThreadExt& ext() const { return _ext; }
451 ThreadExt& ext() { return _ext; }
452
453 // VM operation support
454 int vm_operation_ticket() { return ++_vm_operation_started_count; }
455 int vm_operation_completed_count() { return _vm_operation_completed_count; }
456 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
457
458 // For tracking the heavyweight monitor the thread is pending on.
459 ObjectMonitor* current_pending_monitor() {
460 return _current_pending_monitor;
461 }
462 void set_current_pending_monitor(ObjectMonitor* monitor) {
463 _current_pending_monitor = monitor;
464 }
465 void set_current_pending_monitor_is_from_java(bool from_java) {
466 _current_pending_monitor_is_from_java = from_java;
467 }
468 bool current_pending_monitor_is_from_java() {
469 return _current_pending_monitor_is_from_java;
470 }
471
472 // For tracking the ObjectMonitor on which this thread called Object.wait()
473 ObjectMonitor* current_waiting_monitor() {
474 return _current_waiting_monitor;
475 }
476 void set_current_waiting_monitor(ObjectMonitor* monitor) {
477 _current_waiting_monitor = monitor;
478 }
479
480 // GC support
481 // Apply "f->do_oop" to all root oops in "this".
482 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
483 // Used by JavaThread::oops_do.
484 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
485 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
486
487 // Handles the parallel case for the method below.
488 private:
489 bool claim_oops_do_par_case(int collection_parity);
490 public:
491 // Requires that "collection_parity" is that of the current roots
492 // iteration. If "is_par" is false, sets the parity of "this" to
493 // "collection_parity", and returns "true". If "is_par" is true,
494 // uses an atomic instruction to set the current threads parity to
495 // "collection_parity", if it is not already. Returns "true" iff the
496 // calling thread does the update, this indicates that the calling thread
497 // has claimed the thread's stack as a root groop in the current
498 // collection.
499 bool claim_oops_do(bool is_par, int collection_parity) {
500 if (!is_par) {
501 _oops_do_parity = collection_parity;
502 return true;
503 } else {
504 return claim_oops_do_par_case(collection_parity);
505 }
506 }
507
508 // Sweeper support
509 void nmethods_do(CodeBlobClosure* cf);
510
511 // jvmtiRedefineClasses support
512 void metadata_do(void f(Metadata*));
513
514 // Used by fast lock support
515 virtual bool is_lock_owned(address adr) const;
516
517 // Check if address is in the stack of the thread (not just for locks).
518 // Warning: the method can only be used on the running thread
519 bool is_in_stack(address adr) const;
520 // Check if address is in the usable part of the stack (excludes protected
521 // guard pages)
522 bool is_in_usable_stack(address adr) const;
523
524 // Sets this thread as starting thread. Returns failure if thread
525 // creation fails due to lack of memory, too many threads etc.
526 bool set_as_starting_thread();
527
528 void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; }
529 MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; }
530
531 protected:
532 // OS data associated with the thread
533 OSThread* _osthread; // Platform-specific thread information
534
535 // Thread local resource area for temporary allocation within the VM
536 ResourceArea* _resource_area;
537
538 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
539
540 // Thread local handle area for allocation of handles within the VM
541 HandleArea* _handle_area;
542 GrowableArray<Metadata*>* _metadata_handles;
543
544 // Support for stack overflow handling, get_thread, etc.
545 address _stack_base;
546 size_t _stack_size;
547 uintptr_t _self_raw_id; // used by get_thread (mutable)
548 int _lgrp_id;
549
550 public:
551 // Stack overflow support
552 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
553
554 void set_stack_base(address base) { _stack_base = base; }
555 size_t stack_size() const { return _stack_size; }
556 void set_stack_size(size_t size) { _stack_size = size; }
557 void record_stack_base_and_size();
558
559 bool on_local_stack(address adr) const {
560 /* QQQ this has knowledge of direction, ought to be a stack method */
561 return (_stack_base > adr && adr >= (_stack_base - _stack_size));
562 }
563
564 uintptr_t self_raw_id() { return _self_raw_id; }
565 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
566
567 int lgrp_id() const { return _lgrp_id; }
568 void set_lgrp_id(int value) { _lgrp_id = value; }
569
570 // Printing
571 void print_on(outputStream* st) const;
572 void print() const { print_on(tty); }
573 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
574
575 // Debug-only code
576 #ifdef ASSERT
577 private:
578 // Deadlock detection support for Mutex locks. List of locks own by thread.
579 Monitor* _owned_locks;
580 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
581 // thus the friendship
582 friend class Mutex;
583 friend class Monitor;
584
585 public:
586 void print_owned_locks_on(outputStream* st) const;
587 void print_owned_locks() const { print_owned_locks_on(tty); }
588 Monitor* owned_locks() const { return _owned_locks; }
589 bool owns_locks() const { return owned_locks() != NULL; }
590 bool owns_locks_but_compiled_lock() const;
591
592 // Deadlock detection
593 bool allow_allocation() { return _allow_allocation_count == 0; }
594 ResourceMark* current_resource_mark() { return _current_resource_mark; }
595 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
596 #endif
597
598 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
599
600 private:
601 volatile int _jvmti_env_iteration_count;
602
603 public:
604 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
605 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
606 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
607
608 // Code generation
609 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
610 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
611 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
612
613 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
614 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
615
616 #define TLAB_FIELD_OFFSET(name) \
617 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
618
619 TLAB_FIELD_OFFSET(start)
620 TLAB_FIELD_OFFSET(end)
621 TLAB_FIELD_OFFSET(top)
622 TLAB_FIELD_OFFSET(pf_top)
623 TLAB_FIELD_OFFSET(size) // desired_size
624 TLAB_FIELD_OFFSET(refill_waste_limit)
625 TLAB_FIELD_OFFSET(number_of_refills)
626 TLAB_FIELD_OFFSET(fast_refill_waste)
627 TLAB_FIELD_OFFSET(slow_allocations)
628
629 #undef TLAB_FIELD_OFFSET
630
631 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
632
633 JFR_ONLY(DEFINE_THREAD_LOCAL_OFFSET_JFR;)
634
635 public:
636 volatile intptr_t _Stalled ;
637 volatile int _TypeTag ;
638 ParkEvent * _ParkEvent ; // for synchronized()
639 ParkEvent * _SleepEvent ; // for Thread.sleep
640 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
641 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
642 int NativeSyncRecursion ; // diagnostic
643
644 volatile int _OnTrap ; // Resume-at IP delta
645 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
646 jint _hashStateX ; // thread-specific hashCode generator state
647 jint _hashStateY ;
648 jint _hashStateZ ;
649 void * _schedctl ;
650
651
652 volatile jint rng [4] ; // RNG for spin loop
653
654 // Low-level leaf-lock primitives used to implement synchronization
655 // and native monitor-mutex infrastructure.
656 // Not for general synchronization use.
657 static void SpinAcquire (volatile int * Lock, const char * Name) ;
658 static void SpinRelease (volatile int * Lock) ;
659 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
660 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
661 static void muxRelease (volatile intptr_t * Lock) ;
662 };
663
664 // Inline implementation of Thread::current()
665 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
666 // startup.
667 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
668 // period. This is inlined in thread_<os_family>.inline.hpp.
669
670 inline Thread* Thread::current() {
671 #ifdef ASSERT
672 // This function is very high traffic. Define PARANOID to enable expensive
673 // asserts.
674 #ifdef PARANOID
675 // Signal handler should call ThreadLocalStorage::get_thread_slow()
676 Thread* t = ThreadLocalStorage::get_thread_slow();
677 assert(t != NULL && !t->is_inside_signal_handler(),
678 "Don't use Thread::current() inside signal handler");
679 #endif
680 #endif
681 Thread* thread = ThreadLocalStorage::thread();
682 assert(thread != NULL, "just checking");
683 return thread;
684 }
685
686 // Name support for threads. non-JavaThread subclasses with multiple
687 // uniquely named instances should derive from this.
688 class NamedThread: public Thread {
689 friend class VMStructs;
690 enum {
691 max_name_len = 64
692 };
693 private:
694 char* _name;
695 // log JavaThread being processed by oops_do
696 JavaThread* _processed_thread;
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 virtual bool is_Named_thread() const { return true; }
704 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
705 JavaThread *processed_thread() { return _processed_thread; }
706 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
707 };
708
709 // Worker threads are named and have an id of an assigned work.
710 class WorkerThread: public NamedThread {
711 private:
712 uint _id;
713 public:
714 WorkerThread() : _id(0) { }
715 virtual bool is_Worker_thread() const { return true; }
716
717 virtual WorkerThread* as_Worker_thread() const {
718 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
719 return (WorkerThread*) this;
720 }
721
722 void set_id(uint work_id) { _id = work_id; }
723 uint id() const { return _id; }
724 };
725
726 // A single WatcherThread is used for simulating timer interrupts.
727 class WatcherThread: public Thread {
728 friend class VMStructs;
729 public:
730 virtual void run();
731
732 private:
733 static WatcherThread* _watcher_thread;
734
735 static bool _startable;
736 volatile static bool _should_terminate; // updated without holding lock
737 public:
738 enum SomeConstants {
739 delay_interval = 10 // interrupt delay in milliseconds
740 };
741
742 // Constructor
743 WatcherThread();
744
745 // Tester
746 bool is_Watcher_thread() const { return true; }
747
748 // Printing
749 char* name() const { return (char*)"VM Periodic Task Thread"; }
750 void print_on(outputStream* st) const;
751 void print() const { print_on(tty); }
752 void unpark();
753
754 // Returns the single instance of WatcherThread
755 static WatcherThread* watcher_thread() { return _watcher_thread; }
756
757 // Create and start the single instance of WatcherThread, or stop it on shutdown
758 static void start();
759 static void stop();
760 // Only allow start once the VM is sufficiently initialized
761 // Otherwise the first task to enroll will trigger the start
762 static void make_startable();
763 private:
764 int sleep() const;
765 };
766
767
768 class CompilerThread;
769
770 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
771
772 class JavaThread: public Thread {
773 friend class VMStructs;
774 private:
775 JavaThread* _next; // The next thread in the Threads list
776 oop _threadObj; // The Java level thread object
777
778 #ifdef ASSERT
779 private:
780 int _java_call_counter;
781
782 public:
783 int java_call_counter() { return _java_call_counter; }
784 void inc_java_call_counter() { _java_call_counter++; }
785 void dec_java_call_counter() {
786 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
787 _java_call_counter--;
788 }
789 private: // restore original namespace restriction
790 #endif // ifdef ASSERT
791
792 #ifndef PRODUCT
793 public:
794 enum {
795 jump_ring_buffer_size = 16
796 };
797 private: // restore original namespace restriction
798 #endif
799
800 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
801
802 ThreadFunction _entry_point;
803
804 JNIEnv _jni_environment;
805
806 // Deopt support
807 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
808
809 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
810 // transition out of native
811 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
812 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
813 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
814 // Because deoptimization is lazy we must save jvmti requests to set locals
815 // in compiled frames until we deoptimize and we have an interpreter frame.
816 // This holds the pointer to array (yeah like there might be more than one) of
817 // description of compiled vframes that have locals that need to be updated.
818 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
819
820 // Handshake value for fixing 6243940. We need a place for the i2c
821 // adapter to store the callee Method*. This value is NEVER live
822 // across a gc point so it does NOT have to be gc'd
823 // The handshake is open ended since we can't be certain that it will
824 // be NULLed. This is because we rarely ever see the race and end up
825 // in handle_wrong_method which is the backend of the handshake. See
826 // code in i2c adapters and handle_wrong_method.
827
828 Method* _callee_target;
829
830 // Used to pass back results to the interpreter or generated code running Java code.
831 oop _vm_result; // oop result is GC-preserved
832 Metadata* _vm_result_2; // non-oop result
833
834 // See ReduceInitialCardMarks: this holds the precise space interval of
835 // the most recent slow path allocation for which compiled code has
836 // elided card-marks for performance along the fast-path.
837 MemRegion _deferred_card_mark;
838
839 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
840 // allocated during deoptimization
841 // and by JNI_MonitorEnter/Exit
842
843 // Async. requests support
844 enum AsyncRequests {
845 _no_async_condition = 0,
846 _async_exception,
847 _async_unsafe_access_error
848 };
849 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
850 oop _pending_async_exception;
851
852 // Safepoint support
853 public: // Expose _thread_state for SafeFetchInt()
854 volatile JavaThreadState _thread_state;
855 private:
856 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
857 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
858
859 // JavaThread termination support
860 enum TerminatedTypes {
861 _not_terminated = 0xDEAD - 2,
862 _thread_exiting, // JavaThread::exit() has been called for this thread
863 _thread_terminated, // JavaThread is removed from thread list
864 _vm_exited // JavaThread is still executing native code, but VM is terminated
865 // only VM_Exit can set _vm_exited
866 };
867
868 // In general a JavaThread's _terminated field transitions as follows:
869 //
870 // _not_terminated => _thread_exiting => _thread_terminated
871 //
872 // _vm_exited is a special value to cover the case of a JavaThread
873 // executing native code after the VM itself is terminated.
874 volatile TerminatedTypes _terminated;
875 // suspend/resume support
876 volatile bool _suspend_equivalent; // Suspend equivalent condition
877 jint _in_deopt_handler; // count of deoptimization
878 // handlers thread is in
879 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
880 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
881 // never locked) when throwing an exception. Used by interpreter only.
882
883 // JNI attach states:
884 enum JNIAttachStates {
885 _not_attaching_via_jni = 1, // thread is not attaching via JNI
886 _attaching_via_jni, // thread is attaching via JNI
887 _attached_via_jni // thread has attached via JNI
888 };
889
890 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
891 // A native thread that is attaching via JNI starts with a value
892 // of _attaching_via_jni and transitions to _attached_via_jni.
893 volatile JNIAttachStates _jni_attach_state;
894
895 public:
896 // State of the stack guard pages for this thread.
897 enum StackGuardState {
898 stack_guard_unused, // not needed
899 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
900 stack_guard_enabled // enabled
901 };
902
903 private:
904
905 StackGuardState _stack_guard_state;
906
907 // Precompute the limit of the stack as used in stack overflow checks.
908 // We load it from here to simplify the stack overflow check in assembly.
909 address _stack_overflow_limit;
910
911 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
912 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
913 // code)
914 volatile oop _exception_oop; // Exception thrown in compiled code
915 volatile address _exception_pc; // PC where exception happened
916 volatile address _exception_handler_pc; // PC for handler of exception
917 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
918
919 // support for JNI critical regions
920 jint _jni_active_critical; // count of entries into JNI critical region
921
922 // Checked JNI: function name requires exception check
923 char* _pending_jni_exception_check_fn;
924
925 // For deadlock detection.
926 int _depth_first_number;
927
928 // JVMTI PopFrame support
929 // This is set to popframe_pending to signal that top Java frame should be popped immediately
930 int _popframe_condition;
931
932 // If reallocation of scalar replaced objects fails, we throw OOM
933 // and during exception propagation, pop the top
934 // _frames_to_pop_failed_realloc frames, the ones that reference
935 // failed reallocations.
936 int _frames_to_pop_failed_realloc;
937
938 #ifndef PRODUCT
939 int _jmp_ring_index;
940 struct {
941 // We use intptr_t instead of address so debugger doesn't try and display strings
942 intptr_t _target;
943 intptr_t _instruction;
944 const char* _file;
945 int _line;
946 } _jmp_ring[ jump_ring_buffer_size ];
947 #endif /* PRODUCT */
948
949 #if INCLUDE_ALL_GCS
950 // Support for G1 barriers
951
952 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
953 // Set of all such queues.
954 static SATBMarkQueueSet _satb_mark_queue_set;
955
956 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
957 // Set of all such queues.
958 static DirtyCardQueueSet _dirty_card_queue_set;
959
960 void flush_barrier_queues();
961 #endif // INCLUDE_ALL_GCS
962
963 friend class VMThread;
964 friend class ThreadWaitTransition;
965 friend class VM_Exit;
966
967 void initialize(); // Initialized the instance variables
968
969 public:
970 // Constructor
971 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
972 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
973 ~JavaThread();
974
975 #ifdef ASSERT
976 // verify this JavaThread hasn't be published in the Threads::list yet
977 void verify_not_published();
978 #endif
979
980 //JNI functiontable getter/setter for JVMTI jni function table interception API.
981 void set_jni_functions(struct JNINativeInterface_* functionTable) {
982 _jni_environment.functions = functionTable;
983 }
984 struct JNINativeInterface_* get_jni_functions() {
985 return (struct JNINativeInterface_ *)_jni_environment.functions;
986 }
987
988 // This function is called at thread creation to allow
989 // platform specific thread variables to be initialized.
990 void cache_global_variables();
991
992 // Executes Shutdown.shutdown()
993 void invoke_shutdown_hooks();
994
995 // Cleanup on thread exit
996 enum ExitType {
997 normal_exit,
998 jni_detach
999 };
1000 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1001
1002 void cleanup_failed_attach_current_thread();
1003
1004 // Testers
1005 virtual bool is_Java_thread() const { return true; }
1006
1007 // Thread chain operations
1008 JavaThread* next() const { return _next; }
1009 void set_next(JavaThread* p) { _next = p; }
1010
1011 // Thread oop. threadObj() can be NULL for initial JavaThread
1012 // (or for threads attached via JNI)
1013 oop threadObj() const { return _threadObj; }
1014 void set_threadObj(oop p) { _threadObj = p; }
1015
1016 ThreadPriority java_priority() const; // Read from threadObj()
1017
1018 // Prepare thread and add to priority queue. If a priority is
1019 // not specified, use the priority of the thread object. Threads_lock
1020 // must be held while this function is called.
1021 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1022 void prepare_ext();
1023
1024 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1025 address saved_exception_pc() { return _saved_exception_pc; }
1026
1027
1028 ThreadFunction entry_point() const { return _entry_point; }
1029
1030 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1031 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1032
1033 // Last frame anchor routines
1034
1035 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1036
1037 // last_Java_sp
1038 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1039 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1040
1041 // last_Java_pc
1042
1043 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1044
1045 // Safepoint support
1046 #if !(defined(PPC64) || defined(AARCH64))
1047 JavaThreadState thread_state() const { return _thread_state; }
1048 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1049 #else
1050 // Use membars when accessing volatile _thread_state. See
1051 // Threads::create_vm() for size checks.
1052 inline JavaThreadState thread_state() const;
1053 inline void set_thread_state(JavaThreadState s);
1054 #endif
1055 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1056 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1057 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1058
1059 // thread has called JavaThread::exit() or is terminated
1060 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1061 // thread is terminated (no longer on the threads list); we compare
1062 // against the two non-terminated values so that a freed JavaThread
1063 // will also be considered terminated.
1064 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1065 void set_terminated(TerminatedTypes t) { _terminated = t; }
1066 // special for Threads::remove() which is static:
1067 void set_terminated_value() { _terminated = _thread_terminated; }
1068 void block_if_vm_exited();
1069
1070 bool doing_unsafe_access() { return _doing_unsafe_access; }
1071 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1072
1073 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1074 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1075
1076 // Suspend/resume support for JavaThread
1077 private:
1078 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1079 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1080
1081 public:
1082 void java_suspend();
1083 void java_resume();
1084 int java_suspend_self();
1085
1086 void check_and_wait_while_suspended() {
1087 assert(JavaThread::current() == this, "sanity check");
1088
1089 bool do_self_suspend;
1090 do {
1091 // were we externally suspended while we were waiting?
1092 do_self_suspend = handle_special_suspend_equivalent_condition();
1093 if (do_self_suspend) {
1094 // don't surprise the thread that suspended us by returning
1095 java_suspend_self();
1096 set_suspend_equivalent();
1097 }
1098 } while (do_self_suspend);
1099 }
1100 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1101 // Check for async exception in addition to safepoint and suspend request.
1102 static void check_special_condition_for_native_trans(JavaThread *thread);
1103
1104 // Same as check_special_condition_for_native_trans but finishes the
1105 // transition into thread_in_Java mode so that it can potentially
1106 // block.
1107 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1108
1109 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1110 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1111 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1112 // Warning: is_ext_suspend_completed() may temporarily drop the
1113 // SR_lock to allow the thread to reach a stable thread state if
1114 // it is currently in a transient thread state.
1115 return is_ext_suspend_completed(false /*!called_by_wait */,
1116 SuspendRetryDelay, bits);
1117 }
1118
1119 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1120 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1121 // passed as the count and delay parameters. Experiments with specific
1122 // calls to wait_for_ext_suspend_completion() can be done by passing
1123 // other values in the code. Experiments with all calls can be done
1124 // via the appropriate -XX options.
1125 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1126
1127 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1128 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1129
1130 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1131 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1132 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1133
1134 bool is_external_suspend() const {
1135 return (_suspend_flags & _external_suspend) != 0;
1136 }
1137 // Whenever a thread transitions from native to vm/java it must suspend
1138 // if external|deopt suspend is present.
1139 bool is_suspend_after_native() const {
1140 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1141 }
1142
1143 // external suspend request is completed
1144 bool is_ext_suspended() const {
1145 return (_suspend_flags & _ext_suspended) != 0;
1146 }
1147
1148 bool is_external_suspend_with_lock() const {
1149 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1150 return is_external_suspend();
1151 }
1152
1153 // Special method to handle a pending external suspend request
1154 // when a suspend equivalent condition lifts.
1155 bool handle_special_suspend_equivalent_condition() {
1156 assert(is_suspend_equivalent(),
1157 "should only be called in a suspend equivalence condition");
1158 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1159 bool ret = is_external_suspend();
1160 if (!ret) {
1161 // not about to self-suspend so clear suspend equivalence
1162 clear_suspend_equivalent();
1163 }
1164 // implied else:
1165 // We have a pending external suspend request so we leave the
1166 // suspend_equivalent flag set until java_suspend_self() sets
1167 // the ext_suspended flag and clears the suspend_equivalent
1168 // flag. This insures that wait_for_ext_suspend_completion()
1169 // will return consistent values.
1170 return ret;
1171 }
1172
1173 // utility methods to see if we are doing some kind of suspension
1174 bool is_being_ext_suspended() const {
1175 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1176 return is_ext_suspended() || is_external_suspend();
1177 }
1178
1179 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1180
1181 void set_suspend_equivalent() { _suspend_equivalent = true; };
1182 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1183
1184 // Thread.stop support
1185 void send_thread_stop(oop throwable);
1186 AsyncRequests clear_special_runtime_exit_condition() {
1187 AsyncRequests x = _special_runtime_exit_condition;
1188 _special_runtime_exit_condition = _no_async_condition;
1189 return x;
1190 }
1191
1192 // Are any async conditions present?
1193 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1194
1195 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1196
1197 // these next two are also used for self-suspension and async exception support
1198 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1199
1200 // Return true if JavaThread has an asynchronous condition or
1201 // if external suspension is requested.
1202 bool has_special_runtime_exit_condition() {
1203 // We call is_external_suspend() last since external suspend should
1204 // be less common. Because we don't use is_external_suspend_with_lock
1205 // it is possible that we won't see an asynchronous external suspend
1206 // request that has just gotten started, i.e., SR_lock grabbed but
1207 // _external_suspend field change either not made yet or not visible
1208 // yet. However, this is okay because the request is asynchronous and
1209 // we will see the new flag value the next time through. It's also
1210 // possible that the external suspend request is dropped after
1211 // we have checked is_external_suspend(), we will recheck its value
1212 // under SR_lock in java_suspend_self().
1213 return (_special_runtime_exit_condition != _no_async_condition) ||
1214 is_external_suspend() || is_deopt_suspend();
1215 }
1216
1217 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1218
1219 void set_pending_async_exception(oop e) {
1220 _pending_async_exception = e;
1221 _special_runtime_exit_condition = _async_exception;
1222 set_has_async_exception();
1223 }
1224
1225 // Fast-locking support
1226 bool is_lock_owned(address adr) const;
1227
1228 // Accessors for vframe array top
1229 // The linked list of vframe arrays are sorted on sp. This means when we
1230 // unpack the head must contain the vframe array to unpack.
1231 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1232 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1233
1234 // Side structure for defering update of java frame locals until deopt occurs
1235 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1236 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1237
1238 // These only really exist to make debugging deopt problems simpler
1239
1240 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1241 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1242
1243 // The special resourceMark used during deoptimization
1244
1245 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1246 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1247
1248 intptr_t* must_deopt_id() { return _must_deopt_id; }
1249 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1250 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1251
1252 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1253 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1254
1255 Method* callee_target() const { return _callee_target; }
1256 void set_callee_target (Method* x) { _callee_target = x; }
1257
1258 // Oop results of vm runtime calls
1259 oop vm_result() const { return _vm_result; }
1260 void set_vm_result (oop x) { _vm_result = x; }
1261
1262 Metadata* vm_result_2() const { return _vm_result_2; }
1263 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1264
1265 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1266 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1267
1268 // Exception handling for compiled methods
1269 oop exception_oop() const { return _exception_oop; }
1270 address exception_pc() const { return _exception_pc; }
1271 address exception_handler_pc() const { return _exception_handler_pc; }
1272 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1273
1274 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1275 void set_exception_pc(address a) { _exception_pc = a; }
1276 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1277 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1278
1279 void clear_exception_oop_and_pc() {
1280 set_exception_oop(NULL);
1281 set_exception_pc(NULL);
1282 }
1283
1284 // Stack overflow support
1285 inline size_t stack_available(address cur_sp);
1286 address stack_yellow_zone_base()
1287 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1288 size_t stack_yellow_zone_size()
1289 { return StackYellowPages * os::vm_page_size(); }
1290 address stack_red_zone_base()
1291 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1292 size_t stack_red_zone_size()
1293 { return StackRedPages * os::vm_page_size(); }
1294 bool in_stack_yellow_zone(address a)
1295 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1296 bool in_stack_red_zone(address a)
1297 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1298
1299 void create_stack_guard_pages();
1300 void remove_stack_guard_pages();
1301
1302 void enable_stack_yellow_zone();
1303 void disable_stack_yellow_zone();
1304 void enable_stack_red_zone();
1305 void disable_stack_red_zone();
1306
1307 inline bool stack_guard_zone_unused();
1308 inline bool stack_yellow_zone_disabled();
1309 inline bool stack_yellow_zone_enabled();
1310
1311 // Attempt to reguard the stack after a stack overflow may have occurred.
1312 // Returns true if (a) guard pages are not needed on this thread, (b) the
1313 // pages are already guarded, or (c) the pages were successfully reguarded.
1314 // Returns false if there is not enough stack space to reguard the pages, in
1315 // which case the caller should unwind a frame and try again. The argument
1316 // should be the caller's (approximate) sp.
1317 bool reguard_stack(address cur_sp);
1318 // Similar to above but see if current stackpoint is out of the guard area
1319 // and reguard if possible.
1320 bool reguard_stack(void);
1321
1322 address stack_overflow_limit() { return _stack_overflow_limit; }
1323 void set_stack_overflow_limit() {
1324 _stack_overflow_limit = _stack_base - _stack_size +
1325 ((StackShadowPages +
1326 StackYellowPages +
1327 StackRedPages) * os::vm_page_size());
1328 }
1329
1330 // Misc. accessors/mutators
1331 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1332 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1333 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1334
1335 #ifndef PRODUCT
1336 void record_jump(address target, address instr, const char* file, int line);
1337 #endif /* PRODUCT */
1338
1339 // For assembly stub generation
1340 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1341 #ifndef PRODUCT
1342 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1343 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1344 #endif /* PRODUCT */
1345 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1346 static ByteSize last_Java_sp_offset() {
1347 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1348 }
1349 static ByteSize last_Java_pc_offset() {
1350 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1351 }
1352 static ByteSize frame_anchor_offset() {
1353 return byte_offset_of(JavaThread, _anchor);
1354 }
1355 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1356 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1357 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1358 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1359 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1360 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1361 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1362 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1363 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1364 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1365 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1366 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1367 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1368
1369 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1370 static ByteSize should_post_on_exceptions_flag_offset() {
1371 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1372 }
1373
1374 #if INCLUDE_ALL_GCS
1375 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1376 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1377 #endif // INCLUDE_ALL_GCS
1378
1379 // Returns the jni environment for this thread
1380 JNIEnv* jni_environment() { return &_jni_environment; }
1381
1382 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1383 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1384 // Only return NULL if thread is off the thread list; starting to
1385 // exit should not return NULL.
1386 if (thread_from_jni_env->is_terminated()) {
1387 thread_from_jni_env->block_if_vm_exited();
1388 return NULL;
1389 } else {
1390 return thread_from_jni_env;
1391 }
1392 }
1393
1394 // JNI critical regions. These can nest.
1395 bool in_critical() { return _jni_active_critical > 0; }
1396 bool in_last_critical() { return _jni_active_critical == 1; }
1397 void enter_critical() { assert(Thread::current() == this ||
1398 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1399 "this must be current thread or synchronizing");
1400 _jni_active_critical++; }
1401 void exit_critical() { assert(Thread::current() == this,
1402 "this must be current thread");
1403 _jni_active_critical--;
1404 assert(_jni_active_critical >= 0,
1405 "JNI critical nesting problem?"); }
1406
1407 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1408 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1409 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1410 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1411 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1412
1413 // For deadlock detection
1414 int depth_first_number() { return _depth_first_number; }
1415 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1416
1417 private:
1418 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1419
1420 public:
1421 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1422 void add_monitor_chunk(MonitorChunk* chunk);
1423 void remove_monitor_chunk(MonitorChunk* chunk);
1424 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1425 void inc_in_deopt_handler() { _in_deopt_handler++; }
1426 void dec_in_deopt_handler() {
1427 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1428 if (_in_deopt_handler > 0) { // robustness
1429 _in_deopt_handler--;
1430 }
1431 }
1432
1433 private:
1434 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1435
1436 public:
1437
1438 // Frame iteration; calls the function f for all frames on the stack
1439 void frames_do(void f(frame*, const RegisterMap*));
1440
1441 // Memory operations
1442 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1443
1444 // Sweeper operations
1445 void nmethods_do(CodeBlobClosure* cf);
1446
1447 // RedefineClasses Support
1448 void metadata_do(void f(Metadata*));
1449
1450 // Memory management operations
1451 void gc_epilogue();
1452 void gc_prologue();
1453
1454 // Misc. operations
1455 char* name() const { return (char*)get_thread_name(); }
1456 void print_on(outputStream* st) const;
1457 void print() const { print_on(tty); }
1458 void print_value();
1459 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1460 void print_thread_state() const PRODUCT_RETURN;
1461 void print_on_error(outputStream* st, char* buf, int buflen) const;
1462 void verify();
1463 const char* get_thread_name() const;
1464 private:
1465 // factor out low-level mechanics for use in both normal and error cases
1466 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1467 public:
1468 const char* get_threadgroup_name() const;
1469 const char* get_parent_name() const;
1470
1471 // Accessing frames
1472 frame last_frame() {
1473 _anchor.make_walkable(this);
1474 return pd_last_frame();
1475 }
1476 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1477
1478 // Returns method at 'depth' java or native frames down the stack
1479 // Used for security checks
1480 Klass* security_get_caller_class(int depth);
1481
1482 // Print stack trace in external format
1483 void print_stack_on(outputStream* st);
1484 void print_stack() { print_stack_on(tty); }
1485
1486 // Print stack traces in various internal formats
1487 void trace_stack() PRODUCT_RETURN;
1488 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1489 void trace_frames() PRODUCT_RETURN;
1490 void trace_oops() PRODUCT_RETURN;
1491
1492 // Print an annotated view of the stack frames
1493 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1494 void validate_frame_layout() {
1495 print_frame_layout(0, true);
1496 }
1497
1498 // Returns the number of stack frames on the stack
1499 int depth() const;
1500
1501 // Function for testing deoptimization
1502 void deoptimize();
1503 void make_zombies();
1504
1505 void deoptimized_wrt_marked_nmethods();
1506
1507 // Profiling operation (see fprofile.cpp)
1508 public:
1509 bool profile_last_Java_frame(frame* fr);
1510
1511 private:
1512 ThreadProfiler* _thread_profiler;
1513 private:
1514 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1515 friend class FlatProfilerTask; // uses get_thread_profiler.
1516 friend class ThreadProfilerMark; // uses get_thread_profiler.
1517 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1518 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1519 ThreadProfiler* result = _thread_profiler;
1520 _thread_profiler = tp;
1521 return result;
1522 }
1523
1524 public:
1525 // Returns the running thread as a JavaThread
1526 static inline JavaThread* current();
1527
1528 // Returns the active Java thread. Do not use this if you know you are calling
1529 // from a JavaThread, as it's slower than JavaThread::current. If called from
1530 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1531 // operation. You may not want that either.
1532 static JavaThread* active();
1533
1534 inline CompilerThread* as_CompilerThread();
1535
1536 public:
1537 virtual void run();
1538 void thread_main_inner();
1539
1540 private:
1541 // PRIVILEGED STACK
1542 PrivilegedElement* _privileged_stack_top;
1543 GrowableArray<oop>* _array_for_gc;
1544 public:
1545
1546 // Returns the privileged_stack information.
1547 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1548 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1549 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1550
1551 public:
1552 // Thread local information maintained by JVMTI.
1553 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1554 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1555 // getter is used to get this JavaThread's JvmtiThreadState if it has
1556 // one which means NULL can be returned. JvmtiThreadState::state_for()
1557 // is used to get the specified JavaThread's JvmtiThreadState if it has
1558 // one or it allocates a new JvmtiThreadState for the JavaThread and
1559 // returns it. JvmtiThreadState::state_for() will return NULL only if
1560 // the specified JavaThread is exiting.
1561 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1562 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1563 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1564 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1565
1566 // JVMTI PopFrame support
1567 // Setting and clearing popframe_condition
1568 // All of these enumerated values are bits. popframe_pending
1569 // indicates that a PopFrame() has been requested and not yet been
1570 // completed. popframe_processing indicates that that PopFrame() is in
1571 // the process of being completed. popframe_force_deopt_reexecution_bit
1572 // indicates that special handling is required when returning to a
1573 // deoptimized caller.
1574 enum PopCondition {
1575 popframe_inactive = 0x00,
1576 popframe_pending_bit = 0x01,
1577 popframe_processing_bit = 0x02,
1578 popframe_force_deopt_reexecution_bit = 0x04
1579 };
1580 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1581 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1582 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1583 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1584 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1585 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1586 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1587 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1588 #ifdef CC_INTERP
1589 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1590 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1591 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1592 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1593 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1594 #endif
1595
1596 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1597 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1598 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1599
1600 private:
1601 // Saved incoming arguments to popped frame.
1602 // Used only when popped interpreted frame returns to deoptimized frame.
1603 void* _popframe_preserved_args;
1604 int _popframe_preserved_args_size;
1605
1606 public:
1607 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1608 void* popframe_preserved_args();
1609 ByteSize popframe_preserved_args_size();
1610 WordSize popframe_preserved_args_size_in_words();
1611 void popframe_free_preserved_args();
1612
1613
1614 private:
1615 JvmtiThreadState *_jvmti_thread_state;
1616 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1617
1618 // Used by the interpreter in fullspeed mode for frame pop, method
1619 // entry, method exit and single stepping support. This field is
1620 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1621 // It can be set to zero asynchronously (i.e., without a VM operation
1622 // or a lock) so we have to be very careful.
1623 int _interp_only_mode;
1624
1625 public:
1626 // used by the interpreter for fullspeed debugging support (see above)
1627 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1628 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1629 int get_interp_only_mode() { return _interp_only_mode; }
1630 void increment_interp_only_mode() { ++_interp_only_mode; }
1631 void decrement_interp_only_mode() { --_interp_only_mode; }
1632
1633 // support for cached flag that indicates whether exceptions need to be posted for this thread
1634 // if this is false, we can avoid deoptimizing when events are thrown
1635 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1636 private:
1637 int _should_post_on_exceptions_flag;
1638
1639 public:
1640 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1641 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1642
1643 private:
1644 ThreadStatistics *_thread_stat;
1645
1646 public:
1647 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1648
1649 // Return a blocker object for which this thread is blocked parking.
1650 oop current_park_blocker();
1651
1652 private:
1653 static size_t _stack_size_at_create;
1654
1655 public:
1656 static inline size_t stack_size_at_create(void) {
1657 return _stack_size_at_create;
1658 }
1659 static inline void set_stack_size_at_create(size_t value) {
1660 _stack_size_at_create = value;
1661 }
1662
1663 #if INCLUDE_ALL_GCS
1664 // SATB marking queue support
1665 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1666 static SATBMarkQueueSet& satb_mark_queue_set() {
1667 return _satb_mark_queue_set;
1668 }
1669
1670 // Dirty card queue support
1671 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1672 static DirtyCardQueueSet& dirty_card_queue_set() {
1673 return _dirty_card_queue_set;
1674 }
1675 #endif // INCLUDE_ALL_GCS
1676
1677 // This method initializes the SATB and dirty card queues before a
1678 // JavaThread is added to the Java thread list. Right now, we don't
1679 // have to do anything to the dirty card queue (it should have been
1680 // activated when the thread was created), but we have to activate
1681 // the SATB queue if the thread is created while a marking cycle is
1682 // in progress. The activation / de-activation of the SATB queues at
1683 // the beginning / end of a marking cycle is done during safepoints
1684 // so we have to make sure this method is called outside one to be
1685 // able to safely read the active field of the SATB queue set. Right
1686 // now, it is called just before the thread is added to the Java
1687 // thread list in the Threads::add() method. That method is holding
1688 // the Threads_lock which ensures we are outside a safepoint. We
1689 // cannot do the obvious and set the active field of the SATB queue
1690 // when the thread is created given that, in some cases, safepoints
1691 // might happen between the JavaThread constructor being called and the
1692 // thread being added to the Java thread list (an example of this is
1693 // when the structure for the DestroyJavaVM thread is created).
1694 #if INCLUDE_ALL_GCS
1695 void initialize_queues();
1696 #else // INCLUDE_ALL_GCS
1697 void initialize_queues() { }
1698 #endif // INCLUDE_ALL_GCS
1699
1700 // Machine dependent stuff
1701 #ifdef TARGET_OS_ARCH_linux_x86
1702 # include "thread_linux_x86.hpp"
1703 #endif
1704 #ifdef TARGET_OS_ARCH_linux_aarch64
1705 # include "thread_linux_aarch64.hpp"
1706 #endif
1707 #ifdef TARGET_OS_ARCH_linux_sparc
1708 # include "thread_linux_sparc.hpp"
1709 #endif
1710 #ifdef TARGET_OS_ARCH_linux_zero
1711 # include "thread_linux_zero.hpp"
1712 #endif
1713 #ifdef TARGET_OS_ARCH_solaris_x86
1714 # include "thread_solaris_x86.hpp"
1715 #endif
1716 #ifdef TARGET_OS_ARCH_solaris_sparc
1717 # include "thread_solaris_sparc.hpp"
1718 #endif
1719 #ifdef TARGET_OS_ARCH_windows_x86
1720 # include "thread_windows_x86.hpp"
1721 #endif
1722 #ifdef TARGET_OS_ARCH_linux_arm
1723 # include "thread_linux_arm.hpp"
1724 #endif
1725 #ifdef TARGET_OS_ARCH_linux_ppc
1726 # include "thread_linux_ppc.hpp"
1727 #endif
1728 #ifdef TARGET_OS_ARCH_aix_ppc
1729 # include "thread_aix_ppc.hpp"
1730 #endif
1731 #ifdef TARGET_OS_ARCH_bsd_x86
1732 # include "thread_bsd_x86.hpp"
1733 #endif
1734 #ifdef TARGET_OS_ARCH_bsd_zero
1735 # include "thread_bsd_zero.hpp"
1736 #endif
1737
1738
1739 public:
1740 void set_blocked_on_compilation(bool value) {
1741 _blocked_on_compilation = value;
1742 }
1743
1744 bool blocked_on_compilation() {
1745 return _blocked_on_compilation;
1746 }
1747 protected:
1748 bool _blocked_on_compilation;
1749
1750
1751 // JSR166 per-thread parker
1752 private:
1753 Parker* _parker;
1754 public:
1755 Parker* parker() { return _parker; }
1756
1757 // Biased locking support
1758 private:
1759 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1760 public:
1761 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1762 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1763
1764 // clearing/querying jni attach status
1765 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1766 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1767 inline void set_done_attaching_via_jni();
1768 private:
1769 // This field is used to determine if a thread has claimed
1770 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1771 // otherwise its value is the par_id that has been claimed.
1772 uint _claimed_par_id;
1773 public:
1774 uint get_claimed_par_id() { return _claimed_par_id; }
1775 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1776 };
1777
1778 // Inline implementation of JavaThread::current
1779 inline JavaThread* JavaThread::current() {
1780 Thread* thread = ThreadLocalStorage::thread();
1781 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1782 return (JavaThread*)thread;
1783 }
1784
1785 inline CompilerThread* JavaThread::as_CompilerThread() {
1786 assert(is_Compiler_thread(), "just checking");
1787 return (CompilerThread*)this;
1788 }
1789
1790 inline bool JavaThread::stack_guard_zone_unused() {
1791 return _stack_guard_state == stack_guard_unused;
1792 }
1793
1794 inline bool JavaThread::stack_yellow_zone_disabled() {
1795 return _stack_guard_state == stack_guard_yellow_disabled;
1796 }
1797
1798 inline bool JavaThread::stack_yellow_zone_enabled() {
1799 #ifdef ASSERT
1800 if (os::uses_stack_guard_pages() &&
1801 !(DisablePrimordialThreadGuardPages && os::is_primordial_thread())) {
1802 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1803 }
1804 #endif
1805 return _stack_guard_state == stack_guard_enabled;
1806 }
1807
1808 inline size_t JavaThread::stack_available(address cur_sp) {
1809 // This code assumes java stacks grow down
1810 address low_addr; // Limit on the address for deepest stack depth
1811 if ( _stack_guard_state == stack_guard_unused) {
1812 low_addr = stack_base() - stack_size();
1813 } else {
1814 low_addr = stack_yellow_zone_base();
1815 }
1816 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1817 }
1818
1819 // A thread used for Compilation.
1820 class CompilerThread : public JavaThread {
1821 friend class VMStructs;
1822 private:
1823 CompilerCounters* _counters;
1824
1825 ciEnv* _env;
1826 CompileLog* _log;
1827 CompileTask* _task;
1828 CompileQueue* _queue;
1829 BufferBlob* _buffer_blob;
1830
1831 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1832 AbstractCompiler* _compiler;
1833
1834 public:
1835
1836 static CompilerThread* current();
1837
1838 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1839
1840 bool is_Compiler_thread() const { return true; }
1841 // Hide this compiler thread from external view.
1842 bool is_hidden_from_external_view() const { return true; }
1843
1844 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1845 AbstractCompiler* compiler() const { return _compiler; }
1846
1847 CompileQueue* queue() const { return _queue; }
1848 CompilerCounters* counters() const { return _counters; }
1849
1850 // Get/set the thread's compilation environment.
1851 ciEnv* env() { return _env; }
1852 void set_env(ciEnv* env) { _env = env; }
1853
1854 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1855 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1856
1857 // Get/set the thread's logging information
1858 CompileLog* log() { return _log; }
1859 void init_log(CompileLog* log) {
1860 // Set once, for good.
1861 assert(_log == NULL, "set only once");
1862 _log = log;
1863 }
1864
1865 // GC support
1866 // Apply "f->do_oop" to all root oops in "this".
1867 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1868 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1869
1870 #ifndef PRODUCT
1871 private:
1872 IdealGraphPrinter *_ideal_graph_printer;
1873 public:
1874 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1875 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1876 #endif
1877
1878 // Get/set the thread's current task
1879 CompileTask* task() { return _task; }
1880 void set_task(CompileTask* task) { _task = task; }
1881
1882 // Track the nmethod currently being scanned by the sweeper
1883 void set_scanned_nmethod(nmethod* nm) {
1884 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1885 _scanned_nmethod = nm;
1886 }
1887 };
1888
1889 inline CompilerThread* CompilerThread::current() {
1890 return JavaThread::current()->as_CompilerThread();
1891 }
1892
1893
1894 // The active thread queue. It also keeps track of the current used
1895 // thread priorities.
1896 class Threads: AllStatic {
1897 friend class VMStructs;
1898 private:
1899 static JavaThread* _thread_list;
1900 static int _number_of_threads;
1901 static int _number_of_non_daemon_threads;
1902 static int _return_code;
1903 #ifdef ASSERT
1904 static bool _vm_complete;
1905 #endif
1906
1907 public:
1908 // Thread management
1909 // force_daemon is a concession to JNI, where we may need to add a
1910 // thread to the thread list before allocating its thread object
1911 static void add(JavaThread* p, bool force_daemon = false);
1912 static void remove(JavaThread* p);
1913 static bool includes(JavaThread* p);
1914 static JavaThread* first() { return _thread_list; }
1915 static void threads_do(ThreadClosure* tc);
1916
1917 // Initializes the vm and creates the vm thread
1918 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1919 static void convert_vm_init_libraries_to_agents();
1920 static void create_vm_init_libraries();
1921 static void create_vm_init_agents();
1922 static void shutdown_vm_agents();
1923 static bool destroy_vm();
1924 // Supported VM versions via JNI
1925 // Includes JNI_VERSION_1_1
1926 static jboolean is_supported_jni_version_including_1_1(jint version);
1927 // Does not include JNI_VERSION_1_1
1928 static jboolean is_supported_jni_version(jint version);
1929
1930 // Garbage collection
1931 static void follow_other_roots(void f(oop*));
1932
1933 // Apply "f->do_oop" to all root oops in all threads.
1934 // This version may only be called by sequential code.
1935 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1936 // This version may be called by sequential or parallel code.
1937 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1938 // This creates a list of GCTasks, one per thread.
1939 static void create_thread_roots_tasks(GCTaskQueue* q);
1940 // This creates a list of GCTasks, one per thread, for marking objects.
1941 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1942
1943 // Apply "f->do_oop" to roots in all threads that
1944 // are part of compiled frames
1945 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1946
1947 static void convert_hcode_pointers();
1948 static void restore_hcode_pointers();
1949
1950 // Sweeper
1951 static void nmethods_do(CodeBlobClosure* cf);
1952
1953 // RedefineClasses support
1954 static void metadata_do(void f(Metadata*));
1955
1956 static void gc_epilogue();
1957 static void gc_prologue();
1958 #ifdef ASSERT
1959 static bool is_vm_complete() { return _vm_complete; }
1960 #endif
1961
1962 // Verification
1963 static void verify();
1964 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1965 static void print(bool print_stacks, bool internal_format) {
1966 // this function is only used by debug.cpp
1967 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1968 }
1969 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1970
1971 // Get Java threads that are waiting to enter a monitor. If doLock
1972 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1973 // VM needs to be at a safepoint.
1974 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1975 address monitor, bool doLock);
1976
1977 // Get owning Java thread from the monitor's owner field. If doLock
1978 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1979 // VM needs to be at a safepoint.
1980 static JavaThread *owning_thread_from_monitor_owner(address owner,
1981 bool doLock);
1982
1983 // Number of threads on the active threads list
1984 static int number_of_threads() { return _number_of_threads; }
1985 // Number of non-daemon threads on the active threads list
1986 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1987
1988 // Deoptimizes all frames tied to marked nmethods
1989 static void deoptimized_wrt_marked_nmethods();
1990
1991 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
1992
1993 };
1994
1995
1996 // Thread iterator
1997 class ThreadClosure: public StackObj {
1998 public:
1999 virtual void do_thread(Thread* thread) = 0;
2000 };
2001
2002 class SignalHandlerMark: public StackObj {
2003 private:
2004 Thread* _thread;
2005 public:
2006 SignalHandlerMark(Thread* t) {
2007 _thread = t;
2008 if (_thread) _thread->enter_signal_handler();
2009 }
2010 ~SignalHandlerMark() {
2011 if (_thread) _thread->leave_signal_handler();
2012 _thread = NULL;
2013 }
2014 };
2015
2016
2017 #endif // SHARE_VM_RUNTIME_THREAD_HPP