1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 #define SHARE_VM_RUNTIME_THREAD_HPP
27
28 #include "memory/allocation.hpp"
29 #include "memory/threadLocalAllocBuffer.hpp"
30 #include "oops/oop.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvmtiExport.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/javaFrameAnchor.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/mutexLocker.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/osThread.hpp"
39 #include "runtime/park.hpp"
40 #include "runtime/safepoint.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "runtime/threadLocalStorage.hpp"
43 #include "runtime/thread_ext.hpp"
44 #include "runtime/unhandledOops.hpp"
45 #include "trace/traceBackend.hpp"
46 #include "trace/traceMacros.hpp"
47 #include "utilities/exceptions.hpp"
48 #include "utilities/macros.hpp"
49 #include "utilities/top.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/g1/dirtyCardQueue.hpp"
52 #include "gc_implementation/g1/satbQueue.hpp"
53 #endif // INCLUDE_ALL_GCS
54 #ifdef TARGET_ARCH_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 // - WatcherThread
101
102 class Thread: public ThreadShadow {
103 friend class VMStructs;
104 private:
105 // Exception handling
106 // (Note: _pending_exception and friends are in ThreadShadow)
107 //oop _pending_exception; // pending exception for current thread
108 // const char* _exception_file; // file information for exception (debugging only)
109 // int _exception_line; // line information for exception (debugging only)
110 protected:
111 // Support for forcing alignment of thread objects for biased locking
112 void* _real_malloc_address;
113 public:
114 void* operator new(size_t size) throw() { return allocate(size, true); }
115 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
116 return allocate(size, false); }
117 void operator delete(void* p);
118
119 protected:
120 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
121 private:
122
123 // ***************************************************************
124 // Suspend and resume support
125 // ***************************************************************
126 //
127 // VM suspend/resume no longer exists - it was once used for various
128 // things including safepoints but was deprecated and finally removed
129 // in Java 7. Because VM suspension was considered "internal" Java-level
130 // suspension was considered "external", and this legacy naming scheme
131 // remains.
132 //
133 // External suspend/resume requests come from JVM_SuspendThread,
134 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
135 // ResumeThread. External
136 // suspend requests cause _external_suspend to be set and external
137 // resume requests cause _external_suspend to be cleared.
138 // External suspend requests do not nest on top of other external
139 // suspend requests. The higher level APIs reject suspend requests
140 // for already suspended threads.
141 //
142 // The external_suspend
143 // flag is checked by has_special_runtime_exit_condition() and java thread
144 // will self-suspend when handle_special_runtime_exit_condition() is
145 // called. Most uses of the _thread_blocked state in JavaThreads are
146 // considered the same as being externally suspended; if the blocking
147 // condition lifts, the JavaThread will self-suspend. Other places
148 // where VM checks for external_suspend include:
149 // + mutex granting (do not enter monitors when thread is suspended)
150 // + state transitions from _thread_in_native
151 //
152 // In general, java_suspend() does not wait for an external suspend
153 // request to complete. When it returns, the only guarantee is that
154 // the _external_suspend field is true.
155 //
156 // wait_for_ext_suspend_completion() is used to wait for an external
157 // suspend request to complete. External suspend requests are usually
158 // followed by some other interface call that requires the thread to
159 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
160 // the interface that requires quiescence, we give the JavaThread a
161 // chance to self-suspend before we need it to be quiescent. This
162 // improves overall suspend/query performance.
163 //
164 // _suspend_flags controls the behavior of java_ suspend/resume.
165 // It must be set under the protection of SR_lock. Read from the flag is
166 // OK without SR_lock as long as the value is only used as a hint.
167 // (e.g., check _external_suspend first without lock and then recheck
168 // inside SR_lock and finish the suspension)
169 //
170 // _suspend_flags is also overloaded for other "special conditions" so
171 // that a single check indicates whether any special action is needed
172 // eg. for async exceptions.
173 // -------------------------------------------------------------------
174 // Notes:
175 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
176 // but we still update its value to keep other part of the system (mainly
177 // JVMTI) happy. ThreadState is legacy code (see notes in
178 // osThread.hpp).
179 //
180 // 2. It would be more natural if set_external_suspend() is private and
181 // part of java_suspend(), but that probably would affect the suspend/query
182 // performance. Need more investigation on this.
183 //
184
185 // suspend/resume lock: used for self-suspend
186 Monitor* _SR_lock;
187
188 protected:
189 enum SuspendFlags {
190 // NOTE: avoid using the sign-bit as cc generates different test code
191 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
192
193 _external_suspend = 0x20000000U, // thread is asked to self suspend
194 _ext_suspended = 0x40000000U, // thread has self-suspended
195 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
196
197 _has_async_exception = 0x00000001U, // there is a pending async exception
198 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
199 };
200
201 // various suspension related flags - atomically updated
202 // overloaded for async exception checking in check_special_condition_for_native_trans.
203 volatile uint32_t _suspend_flags;
204
205 private:
206 int _num_nested_signal;
207
208 public:
209 void enter_signal_handler() { _num_nested_signal++; }
210 void leave_signal_handler() { _num_nested_signal--; }
211 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
212
213 private:
214 // Debug tracing
215 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
216
217 // Active_handles points to a block of handles
218 JNIHandleBlock* _active_handles;
219
220 // One-element thread local free list
221 JNIHandleBlock* _free_handle_block;
222
223 // Point to the last handle mark
224 HandleMark* _last_handle_mark;
225
226 // The parity of the last strong_roots iteration in which this thread was
227 // claimed as a task.
228 jint _oops_do_parity;
229
230 public:
231 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
232 HandleMark* last_handle_mark() const { return _last_handle_mark; }
233 private:
234
235 // debug support for checking if code does allow safepoints or not
236 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
237 // mutex, or blocking on an object synchronizer (Java locking).
238 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
239 // If !allow_allocation(), then an assertion failure will happen during allocation
240 // (Hence, !allow_safepoint() => !allow_allocation()).
241 //
242 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
243 //
244 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
245 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
246
247 // Used by SkipGCALot class.
248 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
249
250 friend class No_Alloc_Verifier;
251 friend class No_Safepoint_Verifier;
252 friend class Pause_No_Safepoint_Verifier;
253 friend class ThreadLocalStorage;
254 friend class GC_locker;
255
256 ThreadLocalAllocBuffer _tlab; // Thread-local eden
257 ThreadLocalAllocBuffer _gclab; // Thread-local allocation buffer for GC (e.g. evacuation)
258 jlong _allocated_bytes; // Cumulative number of bytes allocated on
259 // the Java heap
260 jlong _allocated_bytes_gclab; // Cumulative number of bytes allocated on
261 // the Java heap, in GCLABs
262
263 // Thread-local buffer used by MetadataOnStackMark.
264 MetadataOnStackBuffer* _metadata_on_stack_buffer;
265
266 TRACE_DATA _trace_data; // Thread-local data for tracing
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 char _oom_during_evac;
274
275 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
276 // is waiting to lock
277 bool _current_pending_monitor_is_from_java; // locking is from Java code
278
279 // ObjectMonitor on which this thread called Object.wait()
280 ObjectMonitor* _current_waiting_monitor;
281
282 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
283 public:
284 ObjectMonitor* omFreeList;
285 int omFreeCount; // length of omFreeList
286 int omFreeProvision; // reload chunk size
287 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
288 int omInUseCount; // length of omInUseList
289
290 #ifdef ASSERT
291 private:
292 bool _visited_for_critical_count;
293
294 public:
295 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
296 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
297 #endif
298
299 public:
300 enum {
301 is_definitely_current_thread = true
302 };
303
304 // Constructor
305 Thread();
306 virtual ~Thread();
307
308 // initializtion
309 void initialize_thread_local_storage();
310
311 // thread entry point
312 virtual void run();
313
314 // Testers
315 virtual bool is_VM_thread() const { return false; }
316 virtual bool is_Java_thread() const { return false; }
317 virtual bool is_Compiler_thread() const { return false; }
318 virtual bool is_hidden_from_external_view() const { return false; }
319 virtual bool is_jvmti_agent_thread() const { return false; }
320 // True iff the thread can perform GC operations at a safepoint.
321 // Generally will be true only of VM thread and parallel GC WorkGang
322 // threads.
323 virtual bool is_GC_task_thread() const { return false; }
324 virtual bool is_Watcher_thread() const { return false; }
325 virtual bool is_ConcurrentGC_thread() const { return false; }
326 virtual bool is_Named_thread() const { return false; }
327 virtual bool is_Worker_thread() const { return false; }
328
329 // Casts
330 virtual WorkerThread* as_Worker_thread() const { return NULL; }
331
332 virtual char* name() const { return (char*)"Unknown thread"; }
333
334 // Returns the current thread
335 static inline Thread* current();
336
337 // Common thread operations
338 static void set_priority(Thread* thread, ThreadPriority priority);
339 static ThreadPriority get_priority(const Thread* const thread);
340 static void start(Thread* thread);
341 static void interrupt(Thread* thr);
342 static bool is_interrupted(Thread* thr, bool clear_interrupted);
343
344 void set_native_thread_name(const char *name) {
345 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
346 os::set_native_thread_name(name);
347 }
348
349 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
350 Monitor* SR_lock() const { return _SR_lock; }
351
352 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
353
354 void set_suspend_flag(SuspendFlags f) {
355 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
356 uint32_t flags;
357 do {
358 flags = _suspend_flags;
359 }
360 while (Atomic::cmpxchg((jint)(flags | f),
361 (volatile jint*)&_suspend_flags,
362 (jint)flags) != (jint)flags);
363 }
364 void clear_suspend_flag(SuspendFlags f) {
365 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
366 uint32_t flags;
367 do {
368 flags = _suspend_flags;
369 }
370 while (Atomic::cmpxchg((jint)(flags & ~f),
371 (volatile jint*)&_suspend_flags,
372 (jint)flags) != (jint)flags);
373 }
374
375 void set_has_async_exception() {
376 set_suspend_flag(_has_async_exception);
377 }
378 void clear_has_async_exception() {
379 clear_suspend_flag(_has_async_exception);
380 }
381
382 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
383
384 void set_critical_native_unlock() {
385 set_suspend_flag(_critical_native_unlock);
386 }
387 void clear_critical_native_unlock() {
388 clear_suspend_flag(_critical_native_unlock);
389 }
390
391 bool is_oom_during_evac() const;
392 void set_oom_during_evac(bool oom);
393
394 #ifdef ASSERT
395 bool is_evac_allowed() const;
396 void set_evac_allowed(bool evac_allowed);
397 #endif
398
399 // Support for Unhandled Oop detection
400 #ifdef CHECK_UNHANDLED_OOPS
401 private:
402 UnhandledOops* _unhandled_oops;
403 public:
404 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
405 // Mark oop safe for gc. It may be stack allocated but won't move.
406 void allow_unhandled_oop(oop *op) {
407 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
408 }
409 // Clear oops at safepoint so crashes point to unhandled oop violator
410 void clear_unhandled_oops() {
411 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
412 }
413 #endif // CHECK_UNHANDLED_OOPS
414
415 #ifndef PRODUCT
416 bool skip_gcalot() { return _skip_gcalot; }
417 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
418 #endif
419
420 public:
421 // Installs a pending exception to be inserted later
422 static void send_async_exception(oop thread_oop, oop java_throwable);
423
424 // Resource area
425 ResourceArea* resource_area() const { return _resource_area; }
426 void set_resource_area(ResourceArea* area) { _resource_area = area; }
427
428 OSThread* osthread() const { return _osthread; }
429 void set_osthread(OSThread* thread) { _osthread = thread; }
430
431 // JNI handle support
432 JNIHandleBlock* active_handles() const { return _active_handles; }
433 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
434 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
435 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
436
437 // Internal handle support
438 HandleArea* handle_area() const { return _handle_area; }
439 void set_handle_area(HandleArea* area) { _handle_area = area; }
440
441 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
442 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
443
444 // Thread-Local Allocation Buffer (TLAB) support
445 ThreadLocalAllocBuffer& tlab() { return _tlab; }
446 void initialize_tlab() {
447 if (UseTLAB) {
448 tlab().initialize(false);
449 gclab().initialize(true);
450 }
451 }
452
453 // Thread-Local GC Allocation Buffer (GCLAB) support
454 ThreadLocalAllocBuffer& gclab() { return _gclab; }
455
456 jlong allocated_bytes() { return _allocated_bytes; }
457 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
458 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
459 inline jlong cooked_allocated_bytes();
460
461 jlong allocated_bytes_gclab() { return _allocated_bytes_gclab; }
462 void set_allocated_bytes_gclab(jlong value) { _allocated_bytes_gclab = value; }
463 void incr_allocated_bytes_gclab(jlong size) { _allocated_bytes_gclab += size; }
464
465 TRACE_DATA* trace_data() { return &_trace_data; }
466
467 const ThreadExt& ext() const { return _ext; }
468 ThreadExt& ext() { return _ext; }
469
470 // VM operation support
471 int vm_operation_ticket() { return ++_vm_operation_started_count; }
472 int vm_operation_completed_count() { return _vm_operation_completed_count; }
473 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
474
475 // For tracking the heavyweight monitor the thread is pending on.
476 ObjectMonitor* current_pending_monitor() {
477 return _current_pending_monitor;
478 }
479 void set_current_pending_monitor(ObjectMonitor* monitor) {
480 _current_pending_monitor = monitor;
481 }
482 void set_current_pending_monitor_is_from_java(bool from_java) {
483 _current_pending_monitor_is_from_java = from_java;
484 }
485 bool current_pending_monitor_is_from_java() {
486 return _current_pending_monitor_is_from_java;
487 }
488
489 // For tracking the ObjectMonitor on which this thread called Object.wait()
490 ObjectMonitor* current_waiting_monitor() {
491 return _current_waiting_monitor;
492 }
493 void set_current_waiting_monitor(ObjectMonitor* monitor) {
494 _current_waiting_monitor = monitor;
495 }
496
497 // GC support
498 // Apply "f->do_oop" to all root oops in "this".
499 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
500 // Used by JavaThread::oops_do.
501 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
502 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
503
504 // Handles the parallel case for the method below.
505 private:
506 bool claim_oops_do_par_case(int collection_parity);
507 public:
508 // Requires that "collection_parity" is that of the current roots
509 // iteration. If "is_par" is false, sets the parity of "this" to
510 // "collection_parity", and returns "true". If "is_par" is true,
511 // uses an atomic instruction to set the current threads parity to
512 // "collection_parity", if it is not already. Returns "true" iff the
513 // calling thread does the update, this indicates that the calling thread
514 // has claimed the thread's stack as a root groop in the current
515 // collection.
516 bool claim_oops_do(bool is_par, int collection_parity) {
517 if (!is_par) {
518 _oops_do_parity = collection_parity;
519 return true;
520 } else {
521 return claim_oops_do_par_case(collection_parity);
522 }
523 }
524
525 // Sweeper support
526 void nmethods_do(CodeBlobClosure* cf);
527
528 // jvmtiRedefineClasses support
529 void metadata_do(void f(Metadata*));
530
531 // Used by fast lock support
532 virtual bool is_lock_owned(address adr) const;
533
534 // Check if address is in the stack of the thread (not just for locks).
535 // Warning: the method can only be used on the running thread
536 bool is_in_stack(address adr) const;
537 // Check if address is in the usable part of the stack (excludes protected
538 // guard pages)
539 bool is_in_usable_stack(address adr) const;
540
541 // Sets this thread as starting thread. Returns failure if thread
542 // creation fails due to lack of memory, too many threads etc.
543 bool set_as_starting_thread();
544
545 void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; }
546 MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; }
547
548 protected:
549 // OS data associated with the thread
550 OSThread* _osthread; // Platform-specific thread information
551
552 // Thread local resource area for temporary allocation within the VM
553 ResourceArea* _resource_area;
554
555 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
556
557 // Thread local handle area for allocation of handles within the VM
558 HandleArea* _handle_area;
559 GrowableArray<Metadata*>* _metadata_handles;
560
561 // Support for stack overflow handling, get_thread, etc.
562 address _stack_base;
563 size_t _stack_size;
564 uintptr_t _self_raw_id; // used by get_thread (mutable)
565 int _lgrp_id;
566
567 public:
568 // Stack overflow support
569 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
570
571 void set_stack_base(address base) { _stack_base = base; }
572 size_t stack_size() const { return _stack_size; }
573 void set_stack_size(size_t size) { _stack_size = size; }
574 void record_stack_base_and_size();
575
576 bool on_local_stack(address adr) const {
577 /* QQQ this has knowledge of direction, ought to be a stack method */
578 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
579 }
580
581 uintptr_t self_raw_id() { return _self_raw_id; }
582 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
583
584 int lgrp_id() const { return _lgrp_id; }
585 void set_lgrp_id(int value) { _lgrp_id = value; }
586
587 // Printing
588 void print_on(outputStream* st) const;
589 void print() const { print_on(tty); }
590 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
591
592 // Debug-only code
593 #ifdef ASSERT
594 private:
595 // Deadlock detection support for Mutex locks. List of locks own by thread.
596 Monitor* _owned_locks;
597 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
598 // thus the friendship
599 friend class Mutex;
600 friend class Monitor;
601
602 public:
603 void print_owned_locks_on(outputStream* st) const;
604 void print_owned_locks() const { print_owned_locks_on(tty); }
605 Monitor* owned_locks() const { return _owned_locks; }
606 bool owns_locks() const { return owned_locks() != NULL; }
607 bool owns_locks_but_compiled_lock() const;
608
609 // Deadlock detection
610 bool allow_allocation() { return _allow_allocation_count == 0; }
611 ResourceMark* current_resource_mark() { return _current_resource_mark; }
612 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
613 #endif
614
615 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
616
617 private:
618 volatile int _jvmti_env_iteration_count;
619
620 public:
621 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
622 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
623 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
624
625 // Code generation
626 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
627 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
628 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
629
630 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
631 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
632
633 #define TLAB_FIELD_OFFSET(name) \
634 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
635
636 TLAB_FIELD_OFFSET(start)
637 TLAB_FIELD_OFFSET(end)
638 TLAB_FIELD_OFFSET(top)
639 TLAB_FIELD_OFFSET(pf_top)
640 TLAB_FIELD_OFFSET(size) // desired_size
641 TLAB_FIELD_OFFSET(refill_waste_limit)
642 TLAB_FIELD_OFFSET(number_of_refills)
643 TLAB_FIELD_OFFSET(fast_refill_waste)
644 TLAB_FIELD_OFFSET(slow_allocations)
645
646 #undef TLAB_FIELD_OFFSET
647
648 static ByteSize gclab_start_offset() { return byte_offset_of(Thread, _gclab) + ThreadLocalAllocBuffer::start_offset(); }
649 static ByteSize gclab_top_offset() { return byte_offset_of(Thread, _gclab) + ThreadLocalAllocBuffer::top_offset(); }
650 static ByteSize gclab_end_offset() { return byte_offset_of(Thread, _gclab) + ThreadLocalAllocBuffer::end_offset(); }
651
652 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
653
654 public:
655 volatile intptr_t _Stalled ;
656 volatile int _TypeTag ;
657 ParkEvent * _ParkEvent ; // for synchronized()
658 ParkEvent * _SleepEvent ; // for Thread.sleep
659 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
660 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
661 int NativeSyncRecursion ; // diagnostic
662
663 volatile int _OnTrap ; // Resume-at IP delta
664 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
665 jint _hashStateX ; // thread-specific hashCode generator state
666 jint _hashStateY ;
667 jint _hashStateZ ;
668 void * _schedctl ;
669
670
671 volatile jint rng [4] ; // RNG for spin loop
672
673 // Low-level leaf-lock primitives used to implement synchronization
674 // and native monitor-mutex infrastructure.
675 // Not for general synchronization use.
676 static void SpinAcquire (volatile int * Lock, const char * Name) ;
677 static void SpinRelease (volatile int * Lock) ;
678 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
679 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
680 static void muxRelease (volatile intptr_t * Lock) ;
681 };
682
683 // Inline implementation of Thread::current()
684 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
685 // startup.
686 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
687 // period. This is inlined in thread_<os_family>.inline.hpp.
688
689 inline Thread* Thread::current() {
690 #ifdef ASSERT
691 // This function is very high traffic. Define PARANOID to enable expensive
692 // asserts.
693 #ifdef PARANOID
694 // Signal handler should call ThreadLocalStorage::get_thread_slow()
695 Thread* t = ThreadLocalStorage::get_thread_slow();
696 assert(t != NULL && !t->is_inside_signal_handler(),
697 "Don't use Thread::current() inside signal handler");
698 #endif
699 #endif
700 Thread* thread = ThreadLocalStorage::thread();
701 assert(thread != NULL, "just checking");
702 return thread;
703 }
704
705 // Name support for threads. non-JavaThread subclasses with multiple
706 // uniquely named instances should derive from this.
707 class NamedThread: public Thread {
708 friend class VMStructs;
709 enum {
710 max_name_len = 64
711 };
712 private:
713 char* _name;
714 // log JavaThread being processed by oops_do
715 JavaThread* _processed_thread;
716
717 public:
718 NamedThread();
719 ~NamedThread();
720 // May only be called once per thread.
721 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
722 virtual bool is_Named_thread() const { return true; }
723 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
724 JavaThread *processed_thread() { return _processed_thread; }
725 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
726 };
727
728 // Worker threads are named and have an id of an assigned work.
729 class WorkerThread: public NamedThread {
730 private:
731 uint _id;
732 public:
733 WorkerThread() : _id(0) { }
734 virtual bool is_Worker_thread() const { return true; }
735
736 virtual WorkerThread* as_Worker_thread() const {
737 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
738 return (WorkerThread*) this;
739 }
740
741 void set_id(uint work_id) { _id = work_id; }
742 uint id() const { return _id; }
743 };
744
745 // A single WatcherThread is used for simulating timer interrupts.
746 class WatcherThread: public Thread {
747 friend class VMStructs;
748 public:
749 virtual void run();
750
751 private:
752 static WatcherThread* _watcher_thread;
753
754 static bool _startable;
755 volatile static bool _should_terminate; // updated without holding lock
756
757 os::WatcherThreadCrashProtection* _crash_protection;
758 public:
759 enum SomeConstants {
760 delay_interval = 10 // interrupt delay in milliseconds
761 };
762
763 // Constructor
764 WatcherThread();
765
766 // Tester
767 bool is_Watcher_thread() const { return true; }
768
769 // Printing
770 char* name() const { return (char*)"VM Periodic Task Thread"; }
771 void print_on(outputStream* st) const;
772 void print() const { print_on(tty); }
773 void unpark();
774
775 // Returns the single instance of WatcherThread
776 static WatcherThread* watcher_thread() { return _watcher_thread; }
777
778 // Create and start the single instance of WatcherThread, or stop it on shutdown
779 static void start();
780 static void stop();
781 // Only allow start once the VM is sufficiently initialized
782 // Otherwise the first task to enroll will trigger the start
783 static void make_startable();
784
785 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
786 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
787 _crash_protection = crash_protection;
788 }
789
790 bool has_crash_protection() const { return _crash_protection != NULL; }
791 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
792
793 private:
794 int sleep() const;
795 };
796
797
798 class CompilerThread;
799
800 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
801
802 class JavaThread: public Thread {
803 friend class VMStructs;
804 private:
805 JavaThread* _next; // The next thread in the Threads list
806 oop _threadObj; // The Java level thread object
807
808 #ifdef ASSERT
809 private:
810 int _java_call_counter;
811
812 public:
813 int java_call_counter() { return _java_call_counter; }
814 void inc_java_call_counter() { _java_call_counter++; }
815 void dec_java_call_counter() {
816 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
817 _java_call_counter--;
818 }
819 private: // restore original namespace restriction
820 #endif // ifdef ASSERT
821
822 #ifndef PRODUCT
823 public:
824 enum {
825 jump_ring_buffer_size = 16
826 };
827 private: // restore original namespace restriction
828 #endif
829
830 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
831
832 ThreadFunction _entry_point;
833
834 JNIEnv _jni_environment;
835
836 // Deopt support
837 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
838
839 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
840 // transition out of native
841 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
842 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
843 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
844 // Because deoptimization is lazy we must save jvmti requests to set locals
845 // in compiled frames until we deoptimize and we have an interpreter frame.
846 // This holds the pointer to array (yeah like there might be more than one) of
847 // description of compiled vframes that have locals that need to be updated.
848 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
849
850 // Handshake value for fixing 6243940. We need a place for the i2c
851 // adapter to store the callee Method*. This value is NEVER live
852 // across a gc point so it does NOT have to be gc'd
853 // The handshake is open ended since we can't be certain that it will
854 // be NULLed. This is because we rarely ever see the race and end up
855 // in handle_wrong_method which is the backend of the handshake. See
856 // code in i2c adapters and handle_wrong_method.
857
858 Method* _callee_target;
859
860 // Used to pass back results to the interpreter or generated code running Java code.
861 oop _vm_result; // oop result is GC-preserved
862 Metadata* _vm_result_2; // non-oop result
863
864 // See ReduceInitialCardMarks: this holds the precise space interval of
865 // the most recent slow path allocation for which compiled code has
866 // elided card-marks for performance along the fast-path.
867 MemRegion _deferred_card_mark;
868
869 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
870 // allocated during deoptimization
871 // and by JNI_MonitorEnter/Exit
872
873 // Async. requests support
874 enum AsyncRequests {
875 _no_async_condition = 0,
876 _async_exception,
877 _async_unsafe_access_error
878 };
879 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
880 oop _pending_async_exception;
881
882 // Safepoint support
883 public: // Expose _thread_state for SafeFetchInt()
884 volatile JavaThreadState _thread_state;
885 private:
886 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
887 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
888
889 // JavaThread termination support
890 enum TerminatedTypes {
891 _not_terminated = 0xDEAD - 2,
892 _thread_exiting, // JavaThread::exit() has been called for this thread
893 _thread_terminated, // JavaThread is removed from thread list
894 _vm_exited // JavaThread is still executing native code, but VM is terminated
895 // only VM_Exit can set _vm_exited
896 };
897
898 // In general a JavaThread's _terminated field transitions as follows:
899 //
900 // _not_terminated => _thread_exiting => _thread_terminated
901 //
902 // _vm_exited is a special value to cover the case of a JavaThread
903 // executing native code after the VM itself is terminated.
904 volatile TerminatedTypes _terminated;
905 // suspend/resume support
906 volatile bool _suspend_equivalent; // Suspend equivalent condition
907 jint _in_deopt_handler; // count of deoptimization
908 // handlers thread is in
909 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
910 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
911 // never locked) when throwing an exception. Used by interpreter only.
912
913 // JNI attach states:
914 enum JNIAttachStates {
915 _not_attaching_via_jni = 1, // thread is not attaching via JNI
916 _attaching_via_jni, // thread is attaching via JNI
917 _attached_via_jni // thread has attached via JNI
918 };
919
920 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
921 // A native thread that is attaching via JNI starts with a value
922 // of _attaching_via_jni and transitions to _attached_via_jni.
923 volatile JNIAttachStates _jni_attach_state;
924
925 public:
926 // State of the stack guard pages for this thread.
927 enum StackGuardState {
928 stack_guard_unused, // not needed
929 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
930 stack_guard_enabled // enabled
931 };
932
933 private:
934
935 StackGuardState _stack_guard_state;
936
937 // Precompute the limit of the stack as used in stack overflow checks.
938 // We load it from here to simplify the stack overflow check in assembly.
939 address _stack_overflow_limit;
940
941 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
942 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
943 // code)
944 volatile oop _exception_oop; // Exception thrown in compiled code
945 volatile address _exception_pc; // PC where exception happened
946 volatile address _exception_handler_pc; // PC for handler of exception
947 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
948
949 // support for JNI critical regions
950 jint _jni_active_critical; // count of entries into JNI critical region
951
952 // Checked JNI: function name requires exception check
953 char* _pending_jni_exception_check_fn;
954
955 // For deadlock detection.
956 int _depth_first_number;
957
958 // JVMTI PopFrame support
959 // This is set to popframe_pending to signal that top Java frame should be popped immediately
960 int _popframe_condition;
961
962 // If reallocation of scalar replaced objects fails, we throw OOM
963 // and during exception propagation, pop the top
964 // _frames_to_pop_failed_realloc frames, the ones that reference
965 // failed reallocations.
966 int _frames_to_pop_failed_realloc;
967
968 #ifndef PRODUCT
969 int _jmp_ring_index;
970 struct {
971 // We use intptr_t instead of address so debugger doesn't try and display strings
972 intptr_t _target;
973 intptr_t _instruction;
974 const char* _file;
975 int _line;
976 } _jmp_ring[ jump_ring_buffer_size ];
977 #endif /* PRODUCT */
978
979 #if INCLUDE_ALL_GCS
980 // Support for G1 barriers
981
982 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
983 // Set of all such queues.
984 static SATBMarkQueueSet _satb_mark_queue_set;
985
986 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
987 // Set of all such queues.
988 static DirtyCardQueueSet _dirty_card_queue_set;
989
990 void flush_barrier_queues();
991
992 // Support for Shenandoah barriers
993 static char _gc_state_global;
994 char _gc_state;
995
996 #endif // INCLUDE_ALL_GCS
997
998 friend class VMThread;
999 friend class ThreadWaitTransition;
1000 friend class VM_Exit;
1001
1002 void initialize(); // Initialized the instance variables
1003
1004 public:
1005 // Constructor
1006 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1007 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1008 ~JavaThread();
1009
1010 #ifdef ASSERT
1011 // verify this JavaThread hasn't be published in the Threads::list yet
1012 void verify_not_published();
1013 #endif
1014
1015 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1016 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1017 _jni_environment.functions = functionTable;
1018 }
1019 struct JNINativeInterface_* get_jni_functions() {
1020 return (struct JNINativeInterface_ *)_jni_environment.functions;
1021 }
1022
1023 // This function is called at thread creation to allow
1024 // platform specific thread variables to be initialized.
1025 void cache_global_variables();
1026
1027 // Executes Shutdown.shutdown()
1028 void invoke_shutdown_hooks();
1029
1030 // Cleanup on thread exit
1031 enum ExitType {
1032 normal_exit,
1033 jni_detach
1034 };
1035 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1036
1037 void cleanup_failed_attach_current_thread();
1038
1039 // Testers
1040 virtual bool is_Java_thread() const { return true; }
1041
1042 // Thread chain operations
1043 JavaThread* next() const { return _next; }
1044 void set_next(JavaThread* p) { _next = p; }
1045
1046 // Thread oop. threadObj() can be NULL for initial JavaThread
1047 // (or for threads attached via JNI)
1048 oop threadObj() const { return _threadObj; }
1049 void set_threadObj(oop p) { _threadObj = p; }
1050
1051 ThreadPriority java_priority() const; // Read from threadObj()
1052
1053 // Prepare thread and add to priority queue. If a priority is
1054 // not specified, use the priority of the thread object. Threads_lock
1055 // must be held while this function is called.
1056 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1057 void prepare_ext();
1058
1059 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1060 address saved_exception_pc() { return _saved_exception_pc; }
1061
1062
1063 ThreadFunction entry_point() const { return _entry_point; }
1064
1065 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1066 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1067
1068 // Last frame anchor routines
1069
1070 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1071
1072 // last_Java_sp
1073 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1074 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1075
1076 // last_Java_pc
1077
1078 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1079
1080 // Safepoint support
1081 #if !(defined(PPC64) || defined(AARCH64))
1082 JavaThreadState thread_state() const { return _thread_state; }
1083 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1084 #else
1085 // Use membars when accessing volatile _thread_state. See
1086 // Threads::create_vm() for size checks.
1087 inline JavaThreadState thread_state() const;
1088 inline void set_thread_state(JavaThreadState s);
1089 #endif
1090 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1091 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1092 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1093
1094 // thread has called JavaThread::exit() or is terminated
1095 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1096 // thread is terminated (no longer on the threads list); we compare
1097 // against the two non-terminated values so that a freed JavaThread
1098 // will also be considered terminated.
1099 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1100 void set_terminated(TerminatedTypes t) { _terminated = t; }
1101 // special for Threads::remove() which is static:
1102 void set_terminated_value() { _terminated = _thread_terminated; }
1103 void block_if_vm_exited();
1104
1105 bool doing_unsafe_access() { return _doing_unsafe_access; }
1106 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1107
1108 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1109 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1110
1111 // Suspend/resume support for JavaThread
1112 private:
1113 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1114 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1115
1116 public:
1117 void java_suspend();
1118 void java_resume();
1119 int java_suspend_self();
1120
1121 void check_and_wait_while_suspended() {
1122 assert(JavaThread::current() == this, "sanity check");
1123
1124 bool do_self_suspend;
1125 do {
1126 // were we externally suspended while we were waiting?
1127 do_self_suspend = handle_special_suspend_equivalent_condition();
1128 if (do_self_suspend) {
1129 // don't surprise the thread that suspended us by returning
1130 java_suspend_self();
1131 set_suspend_equivalent();
1132 }
1133 } while (do_self_suspend);
1134 }
1135 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1136 // Check for async exception in addition to safepoint and suspend request.
1137 static void check_special_condition_for_native_trans(JavaThread *thread);
1138
1139 // Same as check_special_condition_for_native_trans but finishes the
1140 // transition into thread_in_Java mode so that it can potentially
1141 // block.
1142 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1143
1144 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1145 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1146 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1147 // Warning: is_ext_suspend_completed() may temporarily drop the
1148 // SR_lock to allow the thread to reach a stable thread state if
1149 // it is currently in a transient thread state.
1150 return is_ext_suspend_completed(false /*!called_by_wait */,
1151 SuspendRetryDelay, bits);
1152 }
1153
1154 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1155 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1156 // passed as the count and delay parameters. Experiments with specific
1157 // calls to wait_for_ext_suspend_completion() can be done by passing
1158 // other values in the code. Experiments with all calls can be done
1159 // via the appropriate -XX options.
1160 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1161
1162 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1163 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1164
1165 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1166 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1167 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1168
1169 bool is_external_suspend() const {
1170 return (_suspend_flags & _external_suspend) != 0;
1171 }
1172 // Whenever a thread transitions from native to vm/java it must suspend
1173 // if external|deopt suspend is present.
1174 bool is_suspend_after_native() const {
1175 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1176 }
1177
1178 // external suspend request is completed
1179 bool is_ext_suspended() const {
1180 return (_suspend_flags & _ext_suspended) != 0;
1181 }
1182
1183 bool is_external_suspend_with_lock() const {
1184 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1185 return is_external_suspend();
1186 }
1187
1188 // Special method to handle a pending external suspend request
1189 // when a suspend equivalent condition lifts.
1190 bool handle_special_suspend_equivalent_condition() {
1191 assert(is_suspend_equivalent(),
1192 "should only be called in a suspend equivalence condition");
1193 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1194 bool ret = is_external_suspend();
1195 if (!ret) {
1196 // not about to self-suspend so clear suspend equivalence
1197 clear_suspend_equivalent();
1198 }
1199 // implied else:
1200 // We have a pending external suspend request so we leave the
1201 // suspend_equivalent flag set until java_suspend_self() sets
1202 // the ext_suspended flag and clears the suspend_equivalent
1203 // flag. This insures that wait_for_ext_suspend_completion()
1204 // will return consistent values.
1205 return ret;
1206 }
1207
1208 // utility methods to see if we are doing some kind of suspension
1209 bool is_being_ext_suspended() const {
1210 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1211 return is_ext_suspended() || is_external_suspend();
1212 }
1213
1214 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1215
1216 void set_suspend_equivalent() { _suspend_equivalent = true; };
1217 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1218
1219 // Thread.stop support
1220 void send_thread_stop(oop throwable);
1221 AsyncRequests clear_special_runtime_exit_condition() {
1222 AsyncRequests x = _special_runtime_exit_condition;
1223 _special_runtime_exit_condition = _no_async_condition;
1224 return x;
1225 }
1226
1227 // Are any async conditions present?
1228 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1229
1230 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1231
1232 // these next two are also used for self-suspension and async exception support
1233 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1234
1235 // Return true if JavaThread has an asynchronous condition or
1236 // if external suspension is requested.
1237 bool has_special_runtime_exit_condition() {
1238 // We call is_external_suspend() last since external suspend should
1239 // be less common. Because we don't use is_external_suspend_with_lock
1240 // it is possible that we won't see an asynchronous external suspend
1241 // request that has just gotten started, i.e., SR_lock grabbed but
1242 // _external_suspend field change either not made yet or not visible
1243 // yet. However, this is okay because the request is asynchronous and
1244 // we will see the new flag value the next time through. It's also
1245 // possible that the external suspend request is dropped after
1246 // we have checked is_external_suspend(), we will recheck its value
1247 // under SR_lock in java_suspend_self().
1248 return (_special_runtime_exit_condition != _no_async_condition) ||
1249 is_external_suspend() || is_deopt_suspend();
1250 }
1251
1252 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1253
1254 void set_pending_async_exception(oop e) {
1255 _pending_async_exception = e;
1256 _special_runtime_exit_condition = _async_exception;
1257 set_has_async_exception();
1258 }
1259
1260 // Fast-locking support
1261 bool is_lock_owned(address adr) const;
1262
1263 // Accessors for vframe array top
1264 // The linked list of vframe arrays are sorted on sp. This means when we
1265 // unpack the head must contain the vframe array to unpack.
1266 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1267 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1268
1269 // Side structure for defering update of java frame locals until deopt occurs
1270 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1271 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1272
1273 // These only really exist to make debugging deopt problems simpler
1274
1275 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1276 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1277
1278 // The special resourceMark used during deoptimization
1279
1280 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1281 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1282
1283 intptr_t* must_deopt_id() { return _must_deopt_id; }
1284 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1285 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1286
1287 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1288 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1289
1290 Method* callee_target() const { return _callee_target; }
1291 void set_callee_target (Method* x) { _callee_target = x; }
1292
1293 // Oop results of vm runtime calls
1294 oop vm_result() const { return _vm_result; }
1295 void set_vm_result (oop x) { _vm_result = x; }
1296
1297 Metadata* vm_result_2() const { return _vm_result_2; }
1298 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1299
1300 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1301 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1302
1303 // Exception handling for compiled methods
1304 oop exception_oop() const { return _exception_oop; }
1305 address exception_pc() const { return _exception_pc; }
1306 address exception_handler_pc() const { return _exception_handler_pc; }
1307 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1308
1309 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1310 void set_exception_pc(address a) { _exception_pc = a; }
1311 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1312 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1313
1314 void clear_exception_oop_and_pc() {
1315 set_exception_oop(NULL);
1316 set_exception_pc(NULL);
1317 }
1318
1319 // Stack overflow support
1320 inline size_t stack_available(address cur_sp);
1321 address stack_yellow_zone_base()
1322 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1323 size_t stack_yellow_zone_size()
1324 { return StackYellowPages * os::vm_page_size(); }
1325 address stack_red_zone_base()
1326 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1327 size_t stack_red_zone_size()
1328 { return StackRedPages * os::vm_page_size(); }
1329 bool in_stack_yellow_zone(address a)
1330 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1331 bool in_stack_red_zone(address a)
1332 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1333
1334 void create_stack_guard_pages();
1335 void remove_stack_guard_pages();
1336
1337 void enable_stack_yellow_zone();
1338 void disable_stack_yellow_zone();
1339 void enable_stack_red_zone();
1340 void disable_stack_red_zone();
1341
1342 inline bool stack_guard_zone_unused();
1343 inline bool stack_yellow_zone_disabled();
1344 inline bool stack_yellow_zone_enabled();
1345
1346 // Attempt to reguard the stack after a stack overflow may have occurred.
1347 // Returns true if (a) guard pages are not needed on this thread, (b) the
1348 // pages are already guarded, or (c) the pages were successfully reguarded.
1349 // Returns false if there is not enough stack space to reguard the pages, in
1350 // which case the caller should unwind a frame and try again. The argument
1351 // should be the caller's (approximate) sp.
1352 bool reguard_stack(address cur_sp);
1353 // Similar to above but see if current stackpoint is out of the guard area
1354 // and reguard if possible.
1355 bool reguard_stack(void);
1356
1357 address stack_overflow_limit() { return _stack_overflow_limit; }
1358 void set_stack_overflow_limit() {
1359 _stack_overflow_limit = _stack_base - _stack_size +
1360 ((StackShadowPages +
1361 StackYellowPages +
1362 StackRedPages) * os::vm_page_size());
1363 }
1364
1365 // Misc. accessors/mutators
1366 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1367 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1368 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1369
1370 #ifndef PRODUCT
1371 void record_jump(address target, address instr, const char* file, int line);
1372 #endif /* PRODUCT */
1373
1374 // For assembly stub generation
1375 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1376 #ifndef PRODUCT
1377 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1378 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1379 #endif /* PRODUCT */
1380 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1381 static ByteSize last_Java_sp_offset() {
1382 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1383 }
1384 static ByteSize last_Java_pc_offset() {
1385 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1386 }
1387 static ByteSize frame_anchor_offset() {
1388 return byte_offset_of(JavaThread, _anchor);
1389 }
1390 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1391 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1392 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1393 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1394 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1395 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1396 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1397 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1398 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1399 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1400 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1401 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1402 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1403
1404 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1405 static ByteSize should_post_on_exceptions_flag_offset() {
1406 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1407 }
1408
1409 #if INCLUDE_ALL_GCS
1410 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1411 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1412
1413 static ByteSize gc_state_offset() { return byte_offset_of(JavaThread, _gc_state); }
1414
1415 #endif // INCLUDE_ALL_GCS
1416
1417 // Returns the jni environment for this thread
1418 JNIEnv* jni_environment() { return &_jni_environment; }
1419
1420 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1421 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1422 // Only return NULL if thread is off the thread list; starting to
1423 // exit should not return NULL.
1424 if (thread_from_jni_env->is_terminated()) {
1425 thread_from_jni_env->block_if_vm_exited();
1426 return NULL;
1427 } else {
1428 return thread_from_jni_env;
1429 }
1430 }
1431
1432 // JNI critical regions. These can nest.
1433 bool in_critical() { return _jni_active_critical > 0; }
1434 bool in_last_critical() { return _jni_active_critical == 1; }
1435 void enter_critical() { assert(Thread::current() == this ||
1436 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1437 "this must be current thread or synchronizing");
1438 _jni_active_critical++; }
1439 void exit_critical() { assert(Thread::current() == this,
1440 "this must be current thread");
1441 _jni_active_critical--;
1442 assert(_jni_active_critical >= 0,
1443 "JNI critical nesting problem?"); }
1444
1445 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1446 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1447 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1448 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1449 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1450
1451 // For deadlock detection
1452 int depth_first_number() { return _depth_first_number; }
1453 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1454
1455 private:
1456 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1457
1458 public:
1459 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1460 void add_monitor_chunk(MonitorChunk* chunk);
1461 void remove_monitor_chunk(MonitorChunk* chunk);
1462 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1463 void inc_in_deopt_handler() { _in_deopt_handler++; }
1464 void dec_in_deopt_handler() {
1465 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1466 if (_in_deopt_handler > 0) { // robustness
1467 _in_deopt_handler--;
1468 }
1469 }
1470
1471 private:
1472 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1473
1474 public:
1475
1476 // Frame iteration; calls the function f for all frames on the stack
1477 void frames_do(void f(frame*, const RegisterMap*));
1478
1479 // Memory operations
1480 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1481
1482 // Sweeper operations
1483 void nmethods_do(CodeBlobClosure* cf);
1484
1485 // RedefineClasses Support
1486 void metadata_do(void f(Metadata*));
1487
1488 // Memory management operations
1489 void gc_epilogue();
1490 void gc_prologue();
1491
1492 // Misc. operations
1493 char* name() const { return (char*)get_thread_name(); }
1494 void print_on(outputStream* st) const;
1495 void print() const { print_on(tty); }
1496 void print_value();
1497 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1498 void print_thread_state() const PRODUCT_RETURN;
1499 void print_on_error(outputStream* st, char* buf, int buflen) const;
1500 void verify();
1501 const char* get_thread_name() const;
1502 private:
1503 // factor out low-level mechanics for use in both normal and error cases
1504 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1505 public:
1506 const char* get_threadgroup_name() const;
1507 const char* get_parent_name() const;
1508
1509 // Accessing frames
1510 frame last_frame() {
1511 _anchor.make_walkable(this);
1512 return pd_last_frame();
1513 }
1514 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1515
1516 // Returns method at 'depth' java or native frames down the stack
1517 // Used for security checks
1518 Klass* security_get_caller_class(int depth);
1519
1520 // Print stack trace in external format
1521 void print_stack_on(outputStream* st);
1522 void print_stack() { print_stack_on(tty); }
1523
1524 // Print stack traces in various internal formats
1525 void trace_stack() PRODUCT_RETURN;
1526 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1527 void trace_frames() PRODUCT_RETURN;
1528 void trace_oops() PRODUCT_RETURN;
1529
1530 // Print an annotated view of the stack frames
1531 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1532 void validate_frame_layout() {
1533 print_frame_layout(0, true);
1534 }
1535
1536 // Returns the number of stack frames on the stack
1537 int depth() const;
1538
1539 // Function for testing deoptimization
1540 void deoptimize();
1541 void make_zombies();
1542
1543 void deoptimized_wrt_marked_nmethods();
1544
1545 // Profiling operation (see fprofile.cpp)
1546 public:
1547 bool profile_last_Java_frame(frame* fr);
1548
1549 private:
1550 ThreadProfiler* _thread_profiler;
1551 private:
1552 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1553 friend class FlatProfilerTask; // uses get_thread_profiler.
1554 friend class ThreadProfilerMark; // uses get_thread_profiler.
1555 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1556 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1557 ThreadProfiler* result = _thread_profiler;
1558 _thread_profiler = tp;
1559 return result;
1560 }
1561
1562 public:
1563 // Returns the running thread as a JavaThread
1564 static inline JavaThread* current();
1565
1566 // Returns the active Java thread. Do not use this if you know you are calling
1567 // from a JavaThread, as it's slower than JavaThread::current. If called from
1568 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1569 // operation. You may not want that either.
1570 static JavaThread* active();
1571
1572 inline CompilerThread* as_CompilerThread();
1573
1574 public:
1575 virtual void run();
1576 void thread_main_inner();
1577
1578 private:
1579 // PRIVILEGED STACK
1580 PrivilegedElement* _privileged_stack_top;
1581 GrowableArray<oop>* _array_for_gc;
1582 public:
1583
1584 // Returns the privileged_stack information.
1585 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1586 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1587 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1588
1589 public:
1590 // Thread local information maintained by JVMTI.
1591 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1592 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1593 // getter is used to get this JavaThread's JvmtiThreadState if it has
1594 // one which means NULL can be returned. JvmtiThreadState::state_for()
1595 // is used to get the specified JavaThread's JvmtiThreadState if it has
1596 // one or it allocates a new JvmtiThreadState for the JavaThread and
1597 // returns it. JvmtiThreadState::state_for() will return NULL only if
1598 // the specified JavaThread is exiting.
1599 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1600 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1601 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1602 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1603
1604 // JVMTI PopFrame support
1605 // Setting and clearing popframe_condition
1606 // All of these enumerated values are bits. popframe_pending
1607 // indicates that a PopFrame() has been requested and not yet been
1608 // completed. popframe_processing indicates that that PopFrame() is in
1609 // the process of being completed. popframe_force_deopt_reexecution_bit
1610 // indicates that special handling is required when returning to a
1611 // deoptimized caller.
1612 enum PopCondition {
1613 popframe_inactive = 0x00,
1614 popframe_pending_bit = 0x01,
1615 popframe_processing_bit = 0x02,
1616 popframe_force_deopt_reexecution_bit = 0x04
1617 };
1618 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1619 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1620 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1621 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1622 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1623 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1624 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1625 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1626 #ifdef CC_INTERP
1627 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1628 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1629 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1630 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1631 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1632 #endif
1633
1634 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1635 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1636 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1637
1638 private:
1639 // Saved incoming arguments to popped frame.
1640 // Used only when popped interpreted frame returns to deoptimized frame.
1641 void* _popframe_preserved_args;
1642 int _popframe_preserved_args_size;
1643
1644 public:
1645 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1646 void* popframe_preserved_args();
1647 ByteSize popframe_preserved_args_size();
1648 WordSize popframe_preserved_args_size_in_words();
1649 void popframe_free_preserved_args();
1650
1651
1652 private:
1653 JvmtiThreadState *_jvmti_thread_state;
1654 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1655
1656 // Used by the interpreter in fullspeed mode for frame pop, method
1657 // entry, method exit and single stepping support. This field is
1658 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1659 // It can be set to zero asynchronously (i.e., without a VM operation
1660 // or a lock) so we have to be very careful.
1661 int _interp_only_mode;
1662
1663 public:
1664 // used by the interpreter for fullspeed debugging support (see above)
1665 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1666 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1667 int get_interp_only_mode() { return _interp_only_mode; }
1668 void increment_interp_only_mode() { ++_interp_only_mode; }
1669 void decrement_interp_only_mode() { --_interp_only_mode; }
1670
1671 // support for cached flag that indicates whether exceptions need to be posted for this thread
1672 // if this is false, we can avoid deoptimizing when events are thrown
1673 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1674 private:
1675 int _should_post_on_exceptions_flag;
1676
1677 public:
1678 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1679 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1680
1681 private:
1682 ThreadStatistics *_thread_stat;
1683
1684 public:
1685 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1686
1687 // Return a blocker object for which this thread is blocked parking.
1688 oop current_park_blocker();
1689
1690 private:
1691 static size_t _stack_size_at_create;
1692
1693 public:
1694 static inline size_t stack_size_at_create(void) {
1695 return _stack_size_at_create;
1696 }
1697 static inline void set_stack_size_at_create(size_t value) {
1698 _stack_size_at_create = value;
1699 }
1700
1701 #if INCLUDE_ALL_GCS
1702 // SATB marking queue support
1703 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1704 static SATBMarkQueueSet& satb_mark_queue_set() {
1705 return _satb_mark_queue_set;
1706 }
1707
1708 // Dirty card queue support
1709 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1710 static DirtyCardQueueSet& dirty_card_queue_set() {
1711 return _dirty_card_queue_set;
1712 }
1713
1714 inline char gc_state() const;
1715
1716 private:
1717 void set_gc_state(char in_prog);
1718
1719 public:
1720 static void set_gc_state_all_threads(char in_prog);
1721
1722 #endif // INCLUDE_ALL_GCS
1723
1724 // This method initializes the SATB and dirty card queues before a
1725 // JavaThread is added to the Java thread list. Right now, we don't
1726 // have to do anything to the dirty card queue (it should have been
1727 // activated when the thread was created), but we have to activate
1728 // the SATB queue if the thread is created while a marking cycle is
1729 // in progress. The activation / de-activation of the SATB queues at
1730 // the beginning / end of a marking cycle is done during safepoints
1731 // so we have to make sure this method is called outside one to be
1732 // able to safely read the active field of the SATB queue set. Right
1733 // now, it is called just before the thread is added to the Java
1734 // thread list in the Threads::add() method. That method is holding
1735 // the Threads_lock which ensures we are outside a safepoint. We
1736 // cannot do the obvious and set the active field of the SATB queue
1737 // when the thread is created given that, in some cases, safepoints
1738 // might happen between the JavaThread constructor being called and the
1739 // thread being added to the Java thread list (an example of this is
1740 // when the structure for the DestroyJavaVM thread is created).
1741 #if INCLUDE_ALL_GCS
1742 void initialize_queues();
1743 #else // INCLUDE_ALL_GCS
1744 void initialize_queues() { }
1745 #endif // INCLUDE_ALL_GCS
1746
1747 // Machine dependent stuff
1748 #ifdef TARGET_OS_ARCH_linux_x86
1749 # include "thread_linux_x86.hpp"
1750 #endif
1751 #ifdef TARGET_OS_ARCH_linux_aarch64
1752 # include "thread_linux_aarch64.hpp"
1753 #endif
1754 #ifdef TARGET_OS_ARCH_linux_sparc
1755 # include "thread_linux_sparc.hpp"
1756 #endif
1757 #ifdef TARGET_OS_ARCH_linux_zero
1758 # include "thread_linux_zero.hpp"
1759 #endif
1760 #ifdef TARGET_OS_ARCH_solaris_x86
1761 # include "thread_solaris_x86.hpp"
1762 #endif
1763 #ifdef TARGET_OS_ARCH_solaris_sparc
1764 # include "thread_solaris_sparc.hpp"
1765 #endif
1766 #ifdef TARGET_OS_ARCH_windows_x86
1767 # include "thread_windows_x86.hpp"
1768 #endif
1769 #ifdef TARGET_OS_ARCH_linux_arm
1770 # include "thread_linux_arm.hpp"
1771 #endif
1772 #ifdef TARGET_OS_ARCH_linux_ppc
1773 # include "thread_linux_ppc.hpp"
1774 #endif
1775 #ifdef TARGET_OS_ARCH_aix_ppc
1776 # include "thread_aix_ppc.hpp"
1777 #endif
1778 #ifdef TARGET_OS_ARCH_bsd_x86
1779 # include "thread_bsd_x86.hpp"
1780 #endif
1781 #ifdef TARGET_OS_ARCH_bsd_zero
1782 # include "thread_bsd_zero.hpp"
1783 #endif
1784
1785
1786 public:
1787 void set_blocked_on_compilation(bool value) {
1788 _blocked_on_compilation = value;
1789 }
1790
1791 bool blocked_on_compilation() {
1792 return _blocked_on_compilation;
1793 }
1794 protected:
1795 bool _blocked_on_compilation;
1796
1797
1798 // JSR166 per-thread parker
1799 private:
1800 Parker* _parker;
1801 public:
1802 Parker* parker() { return _parker; }
1803
1804 // Biased locking support
1805 private:
1806 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1807 public:
1808 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1809 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1810
1811 // clearing/querying jni attach status
1812 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1813 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1814 inline void set_done_attaching_via_jni();
1815 private:
1816 // This field is used to determine if a thread has claimed
1817 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1818 // otherwise its value is the par_id that has been claimed.
1819 uint _claimed_par_id;
1820 public:
1821 uint get_claimed_par_id() { return _claimed_par_id; }
1822 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1823 };
1824
1825 // Inline implementation of JavaThread::current
1826 inline JavaThread* JavaThread::current() {
1827 Thread* thread = ThreadLocalStorage::thread();
1828 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1829 return (JavaThread*)thread;
1830 }
1831
1832 inline CompilerThread* JavaThread::as_CompilerThread() {
1833 assert(is_Compiler_thread(), "just checking");
1834 return (CompilerThread*)this;
1835 }
1836
1837 inline bool JavaThread::stack_guard_zone_unused() {
1838 return _stack_guard_state == stack_guard_unused;
1839 }
1840
1841 inline bool JavaThread::stack_yellow_zone_disabled() {
1842 return _stack_guard_state == stack_guard_yellow_disabled;
1843 }
1844
1845 inline bool JavaThread::stack_yellow_zone_enabled() {
1846 #ifdef ASSERT
1847 if (os::uses_stack_guard_pages()) {
1848 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1849 }
1850 #endif
1851 return _stack_guard_state == stack_guard_enabled;
1852 }
1853
1854 inline size_t JavaThread::stack_available(address cur_sp) {
1855 // This code assumes java stacks grow down
1856 address low_addr; // Limit on the address for deepest stack depth
1857 if ( _stack_guard_state == stack_guard_unused) {
1858 low_addr = stack_base() - stack_size();
1859 } else {
1860 low_addr = stack_yellow_zone_base();
1861 }
1862 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1863 }
1864
1865 // A thread used for Compilation.
1866 class CompilerThread : public JavaThread {
1867 friend class VMStructs;
1868 private:
1869 CompilerCounters* _counters;
1870
1871 ciEnv* _env;
1872 CompileLog* _log;
1873 CompileTask* _task;
1874 CompileQueue* _queue;
1875 BufferBlob* _buffer_blob;
1876
1877 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1878 AbstractCompiler* _compiler;
1879
1880 public:
1881
1882 static CompilerThread* current();
1883
1884 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1885
1886 bool is_Compiler_thread() const { return true; }
1887 // Hide this compiler thread from external view.
1888 bool is_hidden_from_external_view() const { return true; }
1889
1890 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1891 AbstractCompiler* compiler() const { return _compiler; }
1892
1893 CompileQueue* queue() const { return _queue; }
1894 CompilerCounters* counters() const { return _counters; }
1895
1896 // Get/set the thread's compilation environment.
1897 ciEnv* env() { return _env; }
1898 void set_env(ciEnv* env) { _env = env; }
1899
1900 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1901 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1902
1903 // Get/set the thread's logging information
1904 CompileLog* log() { return _log; }
1905 void init_log(CompileLog* log) {
1906 // Set once, for good.
1907 assert(_log == NULL, "set only once");
1908 _log = log;
1909 }
1910
1911 // GC support
1912 // Apply "f->do_oop" to all root oops in "this".
1913 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1914 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1915
1916 #ifndef PRODUCT
1917 private:
1918 IdealGraphPrinter *_ideal_graph_printer;
1919 public:
1920 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1921 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1922 #endif
1923
1924 // Get/set the thread's current task
1925 CompileTask* task() { return _task; }
1926 void set_task(CompileTask* task) { _task = task; }
1927
1928 // Track the nmethod currently being scanned by the sweeper
1929 void set_scanned_nmethod(nmethod* nm) {
1930 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1931 _scanned_nmethod = nm;
1932 }
1933 };
1934
1935 inline CompilerThread* CompilerThread::current() {
1936 return JavaThread::current()->as_CompilerThread();
1937 }
1938
1939
1940 // The active thread queue. It also keeps track of the current used
1941 // thread priorities.
1942 class Threads: AllStatic {
1943 friend class VMStructs;
1944 private:
1945 static JavaThread* _thread_list;
1946 static int _number_of_threads;
1947 static int _number_of_non_daemon_threads;
1948 static int _return_code;
1949 #ifdef ASSERT
1950 static bool _vm_complete;
1951 #endif
1952
1953 public:
1954 // Thread management
1955 // force_daemon is a concession to JNI, where we may need to add a
1956 // thread to the thread list before allocating its thread object
1957 static void add(JavaThread* p, bool force_daemon = false);
1958 static void remove(JavaThread* p);
1959 static bool includes(JavaThread* p);
1960 static JavaThread* first() { return _thread_list; }
1961 static void threads_do(ThreadClosure* tc);
1962 static void java_threads_do(ThreadClosure* tc);
1963
1964 // Initializes the vm and creates the vm thread
1965 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1966 static void convert_vm_init_libraries_to_agents();
1967 static void create_vm_init_libraries();
1968 static void create_vm_init_agents();
1969 static void shutdown_vm_agents();
1970 static bool destroy_vm();
1971 // Supported VM versions via JNI
1972 // Includes JNI_VERSION_1_1
1973 static jboolean is_supported_jni_version_including_1_1(jint version);
1974 // Does not include JNI_VERSION_1_1
1975 static jboolean is_supported_jni_version(jint version);
1976
1977 // Garbage collection
1978 static void follow_other_roots(void f(oop*));
1979
1980 // Apply "f->do_oop" to all root oops in all threads.
1981 // This version may only be called by sequential code.
1982 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1983 // This version may be called by sequential or parallel code.
1984 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1985 // This creates a list of GCTasks, one per thread.
1986 static void create_thread_roots_tasks(GCTaskQueue* q);
1987 // This creates a list of GCTasks, one per thread, for marking objects.
1988 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1989
1990 // Apply "f->do_oop" to roots in all threads that
1991 // are part of compiled frames
1992 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1993
1994 static void convert_hcode_pointers();
1995 static void restore_hcode_pointers();
1996
1997 // Sweeper
1998 static void nmethods_do(CodeBlobClosure* cf);
1999
2000 // RedefineClasses support
2001 static void metadata_do(void f(Metadata*));
2002
2003 static void gc_epilogue();
2004 static void gc_prologue();
2005 #ifdef ASSERT
2006 static bool is_vm_complete() { return _vm_complete; }
2007 #endif
2008
2009 // Verification
2010 static void verify();
2011 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
2012 static void print(bool print_stacks, bool internal_format) {
2013 // this function is only used by debug.cpp
2014 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
2015 }
2016 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2017
2018 // Get Java threads that are waiting to enter a monitor. If doLock
2019 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2020 // VM needs to be at a safepoint.
2021 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2022 address monitor, bool doLock);
2023
2024 // Get owning Java thread from the monitor's owner field. If doLock
2025 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2026 // VM needs to be at a safepoint.
2027 static JavaThread *owning_thread_from_monitor_owner(address owner,
2028 bool doLock);
2029
2030 // Number of threads on the active threads list
2031 static int number_of_threads() { return _number_of_threads; }
2032 // Number of non-daemon threads on the active threads list
2033 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2034
2035 // Deoptimizes all frames tied to marked nmethods
2036 static void deoptimized_wrt_marked_nmethods();
2037
2038 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2039
2040 };
2041
2042
2043 // Thread iterator
2044 class ThreadClosure: public StackObj {
2045 public:
2046 virtual void do_thread(Thread* thread) = 0;
2047 };
2048
2049 class SignalHandlerMark: public StackObj {
2050 private:
2051 Thread* _thread;
2052 public:
2053 SignalHandlerMark(Thread* t) {
2054 _thread = t;
2055 if (_thread) _thread->enter_signal_handler();
2056 }
2057 ~SignalHandlerMark() {
2058 if (_thread) _thread->leave_signal_handler();
2059 _thread = NULL;
2060 }
2061 };
2062
2063
2064 #endif // SHARE_VM_RUNTIME_THREAD_HPP