1 /*
2 * Copyright (c) 1997, 2019, 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 _trace_flag = 0x00000004U // call tracing backend
200 };
201
202 // various suspension related flags - atomically updated
203 // overloaded for async exception checking in check_special_condition_for_native_trans.
204 volatile uint32_t _suspend_flags;
205
206 private:
207 int _num_nested_signal;
208
209 public:
210 void enter_signal_handler() { _num_nested_signal++; }
211 void leave_signal_handler() { _num_nested_signal--; }
212 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
213
214 private:
215 // Debug tracing
216 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
217
218 // Active_handles points to a block of handles
219 JNIHandleBlock* _active_handles;
220
221 // One-element thread local free list
222 JNIHandleBlock* _free_handle_block;
223
224 // Point to the last handle mark
225 HandleMark* _last_handle_mark;
226
227 // The parity of the last strong_roots iteration in which this thread was
228 // claimed as a task.
229 jint _oops_do_parity;
230
231 public:
232 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
233 HandleMark* last_handle_mark() const { return _last_handle_mark; }
234 private:
235
236 // debug support for checking if code does allow safepoints or not
237 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
238 // mutex, or blocking on an object synchronizer (Java locking).
239 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
240 // If !allow_allocation(), then an assertion failure will happen during allocation
241 // (Hence, !allow_safepoint() => !allow_allocation()).
242 //
243 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
244 //
245 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
246 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
247
248 // Used by SkipGCALot class.
249 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
250
251 friend class No_Alloc_Verifier;
252 friend class No_Safepoint_Verifier;
253 friend class Pause_No_Safepoint_Verifier;
254 friend class ThreadLocalStorage;
255 friend class GC_locker;
256
257 ThreadLocalAllocBuffer _tlab; // Thread-local eden
258 jlong _allocated_bytes; // Cumulative number of bytes allocated on
259 // the Java heap
260
261 // Thread-local buffer used by MetadataOnStackMark.
262 MetadataOnStackBuffer* _metadata_on_stack_buffer;
263
264 mutable TRACE_DATA _trace_data; // Thread-local data for tracing
265
266 ThreadExt _ext;
267
268 int _vm_operation_started_count; // VM_Operation support
269 int _vm_operation_completed_count; // VM_Operation support
270
271 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
272 // is waiting to lock
273 bool _current_pending_monitor_is_from_java; // locking is from Java code
274
275 // ObjectMonitor on which this thread called Object.wait()
276 ObjectMonitor* _current_waiting_monitor;
277
278 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
279 public:
280 ObjectMonitor* omFreeList;
281 int omFreeCount; // length of omFreeList
282 int omFreeProvision; // reload chunk size
283 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
284 int omInUseCount; // length of omInUseList
285
286 #ifdef ASSERT
287 private:
288 bool _visited_for_critical_count;
289
290 public:
291 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
292 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
293 #endif
294
295 public:
296 enum {
297 is_definitely_current_thread = true
298 };
299
300 // Constructor
301 Thread();
302 virtual ~Thread();
303
304 // initializtion
305 void initialize_thread_local_storage();
306
307 // thread entry point
308 virtual void run();
309
310 // Testers
311 virtual bool is_VM_thread() const { return false; }
312 virtual bool is_Java_thread() const { return false; }
313 virtual bool is_Compiler_thread() const { return false; }
314 virtual bool is_hidden_from_external_view() const { return false; }
315 virtual bool is_jvmti_agent_thread() const { return false; }
316 // True iff the thread can perform GC operations at a safepoint.
317 // Generally will be true only of VM thread and parallel GC WorkGang
318 // threads.
319 virtual bool is_GC_task_thread() const { return false; }
320 virtual bool is_Watcher_thread() const { return false; }
321 virtual bool is_ConcurrentGC_thread() const { return false; }
322 virtual bool is_Named_thread() const { return false; }
323 virtual bool is_Worker_thread() const { return false; }
324
325 // Casts
326 virtual WorkerThread* as_Worker_thread() const { return NULL; }
327
328 virtual char* name() const { return (char*)"Unknown thread"; }
329
330 // Returns the current thread
331 static inline Thread* current();
332
333 // Common thread operations
334 static void set_priority(Thread* thread, ThreadPriority priority);
335 static ThreadPriority get_priority(const Thread* const thread);
336 static void start(Thread* thread);
337 static void interrupt(Thread* thr);
338 static bool is_interrupted(Thread* thr, bool clear_interrupted);
339
340 void set_native_thread_name(const char *name) {
341 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
342 os::set_native_thread_name(name);
343 }
344
345 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
346 Monitor* SR_lock() const { return _SR_lock; }
347
348 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
349
350 void set_suspend_flag(SuspendFlags f) {
351 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
352 uint32_t flags;
353 do {
354 flags = _suspend_flags;
355 }
356 while (Atomic::cmpxchg((jint)(flags | f),
357 (volatile jint*)&_suspend_flags,
358 (jint)flags) != (jint)flags);
359 }
360 void clear_suspend_flag(SuspendFlags f) {
361 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
362 uint32_t flags;
363 do {
364 flags = _suspend_flags;
365 }
366 while (Atomic::cmpxchg((jint)(flags & ~f),
367 (volatile jint*)&_suspend_flags,
368 (jint)flags) != (jint)flags);
369 }
370
371 void set_has_async_exception() {
372 set_suspend_flag(_has_async_exception);
373 }
374 void clear_has_async_exception() {
375 clear_suspend_flag(_has_async_exception);
376 }
377
378 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
379
380 void set_critical_native_unlock() {
381 set_suspend_flag(_critical_native_unlock);
382 }
383 void clear_critical_native_unlock() {
384 clear_suspend_flag(_critical_native_unlock);
385 }
386
387 void set_trace_flag() {
388 set_suspend_flag(_trace_flag);
389 }
390
391 void clear_trace_flag() {
392 clear_suspend_flag(_trace_flag);
393 }
394
395 // Support for Unhandled Oop detection
396 #ifdef CHECK_UNHANDLED_OOPS
397 private:
398 UnhandledOops* _unhandled_oops;
399 public:
400 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
401 // Mark oop safe for gc. It may be stack allocated but won't move.
402 void allow_unhandled_oop(oop *op) {
403 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
404 }
405 // Clear oops at safepoint so crashes point to unhandled oop violator
406 void clear_unhandled_oops() {
407 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
408 }
409 #endif // CHECK_UNHANDLED_OOPS
410
411 #ifndef PRODUCT
412 bool skip_gcalot() { return _skip_gcalot; }
413 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
414 #endif
415
416 public:
417 // Installs a pending exception to be inserted later
418 static void send_async_exception(oop thread_oop, oop java_throwable);
419
420 // Resource area
421 ResourceArea* resource_area() const { return _resource_area; }
422 void set_resource_area(ResourceArea* area) { _resource_area = area; }
423
424 OSThread* osthread() const { return _osthread; }
425 void set_osthread(OSThread* thread) { _osthread = thread; }
426
427 // JNI handle support
428 JNIHandleBlock* active_handles() const { return _active_handles; }
429 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
430 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
431 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
432
433 // Internal handle support
434 HandleArea* handle_area() const { return _handle_area; }
435 void set_handle_area(HandleArea* area) { _handle_area = area; }
436
437 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
438 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
439
440 // Thread-Local Allocation Buffer (TLAB) support
441 ThreadLocalAllocBuffer& tlab() { return _tlab; }
442 void initialize_tlab() {
443 if (UseTLAB) {
444 tlab().initialize();
445 }
446 }
447
448 jlong allocated_bytes() { return _allocated_bytes; }
449 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
450 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
451 inline jlong cooked_allocated_bytes();
452
453 TRACE_DEFINE_THREAD_TRACE_DATA_OFFSET;
454 TRACE_DATA* trace_data() const { return &_trace_data; }
455 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; }
456
457 const ThreadExt& ext() const { return _ext; }
458 ThreadExt& ext() { return _ext; }
459
460 // VM operation support
461 int vm_operation_ticket() { return ++_vm_operation_started_count; }
462 int vm_operation_completed_count() { return _vm_operation_completed_count; }
463 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
464
465 // For tracking the heavyweight monitor the thread is pending on.
466 ObjectMonitor* current_pending_monitor() {
467 return _current_pending_monitor;
468 }
469 void set_current_pending_monitor(ObjectMonitor* monitor) {
470 _current_pending_monitor = monitor;
471 }
472 void set_current_pending_monitor_is_from_java(bool from_java) {
473 _current_pending_monitor_is_from_java = from_java;
474 }
475 bool current_pending_monitor_is_from_java() {
476 return _current_pending_monitor_is_from_java;
477 }
478
479 // For tracking the ObjectMonitor on which this thread called Object.wait()
480 ObjectMonitor* current_waiting_monitor() {
481 return _current_waiting_monitor;
482 }
483 void set_current_waiting_monitor(ObjectMonitor* monitor) {
484 _current_waiting_monitor = monitor;
485 }
486
487 // GC support
488 // Apply "f->do_oop" to all root oops in "this".
489 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
490 // Used by JavaThread::oops_do.
491 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
492 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
493
494 // Handles the parallel case for the method below.
495 private:
496 bool claim_oops_do_par_case(int collection_parity);
497 public:
498 // Requires that "collection_parity" is that of the current roots
499 // iteration. If "is_par" is false, sets the parity of "this" to
500 // "collection_parity", and returns "true". If "is_par" is true,
501 // uses an atomic instruction to set the current threads parity to
502 // "collection_parity", if it is not already. Returns "true" iff the
503 // calling thread does the update, this indicates that the calling thread
504 // has claimed the thread's stack as a root groop in the current
505 // collection.
506 bool claim_oops_do(bool is_par, int collection_parity) {
507 if (!is_par) {
508 _oops_do_parity = collection_parity;
509 return true;
510 } else {
511 return claim_oops_do_par_case(collection_parity);
512 }
513 }
514
515 // Sweeper support
516 void nmethods_do(CodeBlobClosure* cf);
517
518 // jvmtiRedefineClasses support
519 void metadata_do(void f(Metadata*));
520
521 // Used by fast lock support
522 virtual bool is_lock_owned(address adr) const;
523
524 // Check if address is in the stack of the thread (not just for locks).
525 // Warning: the method can only be used on the running thread
526 bool is_in_stack(address adr) const;
527 // Check if address is in the usable part of the stack (excludes protected
528 // guard pages)
529 bool is_in_usable_stack(address adr) const;
530
531 // Sets this thread as starting thread. Returns failure if thread
532 // creation fails due to lack of memory, too many threads etc.
533 bool set_as_starting_thread();
534
535 void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; }
536 MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; }
537
538 protected:
539 // OS data associated with the thread
540 OSThread* _osthread; // Platform-specific thread information
541
542 // Thread local resource area for temporary allocation within the VM
543 ResourceArea* _resource_area;
544
545 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
546
547 // Thread local handle area for allocation of handles within the VM
548 HandleArea* _handle_area;
549 GrowableArray<Metadata*>* _metadata_handles;
550
551 // Support for stack overflow handling, get_thread, etc.
552 address _stack_base;
553 size_t _stack_size;
554 uintptr_t _self_raw_id; // used by get_thread (mutable)
555 int _lgrp_id;
556
557 public:
558 // Stack overflow support
559 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
560
561 void set_stack_base(address base) { _stack_base = base; }
562 size_t stack_size() const { return _stack_size; }
563 void set_stack_size(size_t size) { _stack_size = size; }
564 void record_stack_base_and_size();
565
566 bool on_local_stack(address adr) const {
567 /* QQQ this has knowledge of direction, ought to be a stack method */
568 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
569 }
570
571 uintptr_t self_raw_id() { return _self_raw_id; }
572 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
573
574 int lgrp_id() const { return _lgrp_id; }
575 void set_lgrp_id(int value) { _lgrp_id = value; }
576
577 // Printing
578 void print_on(outputStream* st) const;
579 void print() const { print_on(tty); }
580 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
581
582 // Debug-only code
583 #ifdef ASSERT
584 private:
585 // Deadlock detection support for Mutex locks. List of locks own by thread.
586 Monitor* _owned_locks;
587 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
588 // thus the friendship
589 friend class Mutex;
590 friend class Monitor;
591
592 public:
593 void print_owned_locks_on(outputStream* st) const;
594 void print_owned_locks() const { print_owned_locks_on(tty); }
595 Monitor* owned_locks() const { return _owned_locks; }
596 bool owns_locks() const { return owned_locks() != NULL; }
597 bool owns_locks_but_compiled_lock() const;
598
599 // Deadlock detection
600 bool allow_allocation() { return _allow_allocation_count == 0; }
601 ResourceMark* current_resource_mark() { return _current_resource_mark; }
602 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
603 #endif
604
605 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
606
607 private:
608 volatile int _jvmti_env_iteration_count;
609
610 public:
611 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
612 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
613 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
614
615 // Code generation
616 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
617 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
618 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
619
620 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
621 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
622
623 #define TLAB_FIELD_OFFSET(name) \
624 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
625
626 TLAB_FIELD_OFFSET(start)
627 TLAB_FIELD_OFFSET(end)
628 TLAB_FIELD_OFFSET(top)
629 TLAB_FIELD_OFFSET(pf_top)
630 TLAB_FIELD_OFFSET(size) // desired_size
631 TLAB_FIELD_OFFSET(refill_waste_limit)
632 TLAB_FIELD_OFFSET(number_of_refills)
633 TLAB_FIELD_OFFSET(fast_refill_waste)
634 TLAB_FIELD_OFFSET(slow_allocations)
635
636 #undef TLAB_FIELD_OFFSET
637
638 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
639
640 public:
641 volatile intptr_t _Stalled ;
642 volatile int _TypeTag ;
643 ParkEvent * _ParkEvent ; // for synchronized()
644 ParkEvent * _SleepEvent ; // for Thread.sleep
645 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
646 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
647 int NativeSyncRecursion ; // diagnostic
648
649 volatile int _OnTrap ; // Resume-at IP delta
650 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
651 jint _hashStateX ; // thread-specific hashCode generator state
652 jint _hashStateY ;
653 jint _hashStateZ ;
654 void * _schedctl ;
655
656
657 volatile jint rng [4] ; // RNG for spin loop
658
659 // Low-level leaf-lock primitives used to implement synchronization
660 // and native monitor-mutex infrastructure.
661 // Not for general synchronization use.
662 static void SpinAcquire (volatile int * Lock, const char * Name) ;
663 static void SpinRelease (volatile int * Lock) ;
664 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
665 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
666 static void muxRelease (volatile intptr_t * Lock) ;
667 };
668
669 // Inline implementation of Thread::current()
670 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
671 // startup.
672 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
673 // period. This is inlined in thread_<os_family>.inline.hpp.
674
675 inline Thread* Thread::current() {
676 #ifdef ASSERT
677 // This function is very high traffic. Define PARANOID to enable expensive
678 // asserts.
679 #ifdef PARANOID
680 // Signal handler should call ThreadLocalStorage::get_thread_slow()
681 Thread* t = ThreadLocalStorage::get_thread_slow();
682 assert(t != NULL && !t->is_inside_signal_handler(),
683 "Don't use Thread::current() inside signal handler");
684 #endif
685 #endif
686 Thread* thread = ThreadLocalStorage::thread();
687 assert(thread != NULL, "just checking");
688 return thread;
689 }
690
691 // Name support for threads. non-JavaThread subclasses with multiple
692 // uniquely named instances should derive from this.
693 class NamedThread: public Thread {
694 friend class VMStructs;
695 enum {
696 max_name_len = 64
697 };
698 private:
699 char* _name;
700 // log JavaThread being processed by oops_do
701 JavaThread* _processed_thread;
702
703 public:
704 NamedThread();
705 ~NamedThread();
706 // May only be called once per thread.
707 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
708 virtual bool is_Named_thread() const { return true; }
709 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
710 JavaThread *processed_thread() { return _processed_thread; }
711 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
712 };
713
714 // Worker threads are named and have an id of an assigned work.
715 class WorkerThread: public NamedThread {
716 private:
717 uint _id;
718 public:
719 WorkerThread() : _id(0) { }
720 virtual bool is_Worker_thread() const { return true; }
721
722 virtual WorkerThread* as_Worker_thread() const {
723 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
724 return (WorkerThread*) this;
725 }
726
727 void set_id(uint work_id) { _id = work_id; }
728 uint id() const { return _id; }
729 };
730
731 // A single WatcherThread is used for simulating timer interrupts.
732 class WatcherThread: public Thread {
733 friend class VMStructs;
734 public:
735 virtual void run();
736
737 private:
738 static WatcherThread* _watcher_thread;
739
740 static bool _startable;
741 volatile static bool _should_terminate; // updated without holding lock
742
743 os::WatcherThreadCrashProtection* _crash_protection;
744 public:
745 enum SomeConstants {
746 delay_interval = 10 // interrupt delay in milliseconds
747 };
748
749 // Constructor
750 WatcherThread();
751
752 // Tester
753 bool is_Watcher_thread() const { return true; }
754
755 // Printing
756 char* name() const { return (char*)"VM Periodic Task Thread"; }
757 void print_on(outputStream* st) const;
758 void print() const { print_on(tty); }
759 void unpark();
760
761 // Returns the single instance of WatcherThread
762 static WatcherThread* watcher_thread() { return _watcher_thread; }
763
764 // Create and start the single instance of WatcherThread, or stop it on shutdown
765 static void start();
766 static void stop();
767 // Only allow start once the VM is sufficiently initialized
768 // Otherwise the first task to enroll will trigger the start
769 static void make_startable();
770
771 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
772 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
773 _crash_protection = crash_protection;
774 }
775
776 bool has_crash_protection() const { return _crash_protection != NULL; }
777 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
778
779 private:
780 int sleep() const;
781 };
782
783
784 class CompilerThread;
785
786 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
787
788 class JavaThread: public Thread {
789 friend class VMStructs;
790 private:
791 JavaThread* _next; // The next thread in the Threads list
792 oop _threadObj; // The Java level thread object
793
794 #ifdef ASSERT
795 private:
796 int _java_call_counter;
797
798 public:
799 int java_call_counter() { return _java_call_counter; }
800 void inc_java_call_counter() { _java_call_counter++; }
801 void dec_java_call_counter() {
802 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
803 _java_call_counter--;
804 }
805 private: // restore original namespace restriction
806 #endif // ifdef ASSERT
807
808 #ifndef PRODUCT
809 public:
810 enum {
811 jump_ring_buffer_size = 16
812 };
813 private: // restore original namespace restriction
814 #endif
815
816 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
817
818 ThreadFunction _entry_point;
819
820 JNIEnv _jni_environment;
821
822 // Deopt support
823 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
824
825 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
826 // transition out of native
827 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
828 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
829 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
830 // Because deoptimization is lazy we must save jvmti requests to set locals
831 // in compiled frames until we deoptimize and we have an interpreter frame.
832 // This holds the pointer to array (yeah like there might be more than one) of
833 // description of compiled vframes that have locals that need to be updated.
834 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
835
836 // Handshake value for fixing 6243940. We need a place for the i2c
837 // adapter to store the callee Method*. This value is NEVER live
838 // across a gc point so it does NOT have to be gc'd
839 // The handshake is open ended since we can't be certain that it will
840 // be NULLed. This is because we rarely ever see the race and end up
841 // in handle_wrong_method which is the backend of the handshake. See
842 // code in i2c adapters and handle_wrong_method.
843
844 Method* _callee_target;
845
846 // Used to pass back results to the interpreter or generated code running Java code.
847 oop _vm_result; // oop result is GC-preserved
848 Metadata* _vm_result_2; // non-oop result
849
850 // See ReduceInitialCardMarks: this holds the precise space interval of
851 // the most recent slow path allocation for which compiled code has
852 // elided card-marks for performance along the fast-path.
853 MemRegion _deferred_card_mark;
854
855 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
856 // allocated during deoptimization
857 // and by JNI_MonitorEnter/Exit
858
859 // Async. requests support
860 enum AsyncRequests {
861 _no_async_condition = 0,
862 _async_exception,
863 _async_unsafe_access_error
864 };
865 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
866 oop _pending_async_exception;
867
868 // Safepoint support
869 public: // Expose _thread_state for SafeFetchInt()
870 volatile JavaThreadState _thread_state;
871 private:
872 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
873 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
874
875 // JavaThread termination support
876 enum TerminatedTypes {
877 _not_terminated = 0xDEAD - 2,
878 _thread_exiting, // JavaThread::exit() has been called for this thread
879 _thread_terminated, // JavaThread is removed from thread list
880 _vm_exited // JavaThread is still executing native code, but VM is terminated
881 // only VM_Exit can set _vm_exited
882 };
883
884 // In general a JavaThread's _terminated field transitions as follows:
885 //
886 // _not_terminated => _thread_exiting => _thread_terminated
887 //
888 // _vm_exited is a special value to cover the case of a JavaThread
889 // executing native code after the VM itself is terminated.
890 volatile TerminatedTypes _terminated;
891 // suspend/resume support
892 volatile bool _suspend_equivalent; // Suspend equivalent condition
893 jint _in_deopt_handler; // count of deoptimization
894 // handlers thread is in
895 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
896 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
897 // never locked) when throwing an exception. Used by interpreter only.
898
899 // JNI attach states:
900 enum JNIAttachStates {
901 _not_attaching_via_jni = 1, // thread is not attaching via JNI
902 _attaching_via_jni, // thread is attaching via JNI
903 _attached_via_jni // thread has attached via JNI
904 };
905
906 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
907 // A native thread that is attaching via JNI starts with a value
908 // of _attaching_via_jni and transitions to _attached_via_jni.
909 volatile JNIAttachStates _jni_attach_state;
910
911 public:
912 // State of the stack guard pages for this thread.
913 enum StackGuardState {
914 stack_guard_unused, // not needed
915 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
916 stack_guard_enabled // enabled
917 };
918
919 private:
920
921 StackGuardState _stack_guard_state;
922
923 // Precompute the limit of the stack as used in stack overflow checks.
924 // We load it from here to simplify the stack overflow check in assembly.
925 address _stack_overflow_limit;
926
927 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
928 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
929 // code)
930 volatile oop _exception_oop; // Exception thrown in compiled code
931 volatile address _exception_pc; // PC where exception happened
932 volatile address _exception_handler_pc; // PC for handler of exception
933 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
934
935 // support for JNI critical regions
936 jint _jni_active_critical; // count of entries into JNI critical region
937
938 // Checked JNI: function name requires exception check
939 char* _pending_jni_exception_check_fn;
940
941 // For deadlock detection.
942 int _depth_first_number;
943
944 // JVMTI PopFrame support
945 // This is set to popframe_pending to signal that top Java frame should be popped immediately
946 int _popframe_condition;
947
948 // If reallocation of scalar replaced objects fails, we throw OOM
949 // and during exception propagation, pop the top
950 // _frames_to_pop_failed_realloc frames, the ones that reference
951 // failed reallocations.
952 int _frames_to_pop_failed_realloc;
953
954 #ifndef PRODUCT
955 int _jmp_ring_index;
956 struct {
957 // We use intptr_t instead of address so debugger doesn't try and display strings
958 intptr_t _target;
959 intptr_t _instruction;
960 const char* _file;
961 int _line;
962 } _jmp_ring[ jump_ring_buffer_size ];
963 #endif /* PRODUCT */
964
965 #if INCLUDE_ALL_GCS
966 // Support for G1 barriers
967
968 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
969 // Set of all such queues.
970 static SATBMarkQueueSet _satb_mark_queue_set;
971
972 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
973 // Set of all such queues.
974 static DirtyCardQueueSet _dirty_card_queue_set;
975
976 void flush_barrier_queues();
977 #endif // INCLUDE_ALL_GCS
978
979 friend class VMThread;
980 friend class ThreadWaitTransition;
981 friend class VM_Exit;
982
983 void initialize(); // Initialized the instance variables
984
985 public:
986 // Constructor
987 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
988 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
989 ~JavaThread();
990
991 #ifdef ASSERT
992 // verify this JavaThread hasn't be published in the Threads::list yet
993 void verify_not_published();
994 #endif
995
996 //JNI functiontable getter/setter for JVMTI jni function table interception API.
997 void set_jni_functions(struct JNINativeInterface_* functionTable) {
998 _jni_environment.functions = functionTable;
999 }
1000 struct JNINativeInterface_* get_jni_functions() {
1001 return (struct JNINativeInterface_ *)_jni_environment.functions;
1002 }
1003
1004 // This function is called at thread creation to allow
1005 // platform specific thread variables to be initialized.
1006 void cache_global_variables();
1007
1008 // Executes Shutdown.shutdown()
1009 void invoke_shutdown_hooks();
1010
1011 // Cleanup on thread exit
1012 enum ExitType {
1013 normal_exit,
1014 jni_detach
1015 };
1016 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1017
1018 void cleanup_failed_attach_current_thread();
1019
1020 // Testers
1021 virtual bool is_Java_thread() const { return true; }
1022
1023 // Thread chain operations
1024 JavaThread* next() const { return _next; }
1025 void set_next(JavaThread* p) { _next = p; }
1026
1027 // Thread oop. threadObj() can be NULL for initial JavaThread
1028 // (or for threads attached via JNI)
1029 oop threadObj() const { return _threadObj; }
1030 void set_threadObj(oop p) { _threadObj = p; }
1031
1032 ThreadPriority java_priority() const; // Read from threadObj()
1033
1034 // Prepare thread and add to priority queue. If a priority is
1035 // not specified, use the priority of the thread object. Threads_lock
1036 // must be held while this function is called.
1037 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1038 void prepare_ext();
1039
1040 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1041 address saved_exception_pc() { return _saved_exception_pc; }
1042
1043
1044 ThreadFunction entry_point() const { return _entry_point; }
1045
1046 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1047 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1048
1049 // Last frame anchor routines
1050
1051 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1052
1053 // last_Java_sp
1054 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1055 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1056
1057 // last_Java_pc
1058
1059 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1060
1061 // Safepoint support
1062 #ifndef PPC64
1063 JavaThreadState thread_state() const { return _thread_state; }
1064 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1065 #else
1066 // Use membars when accessing volatile _thread_state. See
1067 // Threads::create_vm() for size checks.
1068 inline JavaThreadState thread_state() const;
1069 inline void set_thread_state(JavaThreadState s);
1070 #endif
1071 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1072 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1073 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1074
1075 // thread has called JavaThread::exit() or is terminated
1076 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1077 // thread is terminated (no longer on the threads list); we compare
1078 // against the two non-terminated values so that a freed JavaThread
1079 // will also be considered terminated.
1080 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1081 void set_terminated(TerminatedTypes t) { _terminated = t; }
1082 // special for Threads::remove() which is static:
1083 void set_terminated_value() { _terminated = _thread_terminated; }
1084 void block_if_vm_exited();
1085
1086 bool doing_unsafe_access() { return _doing_unsafe_access; }
1087 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1088
1089 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1090 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1091
1092 // Suspend/resume support for JavaThread
1093 private:
1094 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1095 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1096
1097 public:
1098 void java_suspend();
1099 void java_resume();
1100 int java_suspend_self();
1101
1102 void check_and_wait_while_suspended() {
1103 assert(JavaThread::current() == this, "sanity check");
1104
1105 bool do_self_suspend;
1106 do {
1107 // were we externally suspended while we were waiting?
1108 do_self_suspend = handle_special_suspend_equivalent_condition();
1109 if (do_self_suspend) {
1110 // don't surprise the thread that suspended us by returning
1111 java_suspend_self();
1112 set_suspend_equivalent();
1113 }
1114 } while (do_self_suspend);
1115 }
1116 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1117 // Check for async exception in addition to safepoint and suspend request.
1118 static void check_special_condition_for_native_trans(JavaThread *thread);
1119
1120 // Same as check_special_condition_for_native_trans but finishes the
1121 // transition into thread_in_Java mode so that it can potentially
1122 // block.
1123 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1124
1125 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1126 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1127 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1128 // Warning: is_ext_suspend_completed() may temporarily drop the
1129 // SR_lock to allow the thread to reach a stable thread state if
1130 // it is currently in a transient thread state.
1131 return is_ext_suspend_completed(false /*!called_by_wait */,
1132 SuspendRetryDelay, bits);
1133 }
1134
1135 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1136 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1137 // passed as the count and delay parameters. Experiments with specific
1138 // calls to wait_for_ext_suspend_completion() can be done by passing
1139 // other values in the code. Experiments with all calls can be done
1140 // via the appropriate -XX options.
1141 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1142
1143 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1144 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1145
1146 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1147 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1148 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1149
1150 bool is_external_suspend() const {
1151 return (_suspend_flags & _external_suspend) != 0;
1152 }
1153 // Whenever a thread transitions from native to vm/java it must suspend
1154 // if external|deopt suspend is present.
1155 bool is_suspend_after_native() const {
1156 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1157 }
1158
1159 // external suspend request is completed
1160 bool is_ext_suspended() const {
1161 return (_suspend_flags & _ext_suspended) != 0;
1162 }
1163
1164 bool is_external_suspend_with_lock() const {
1165 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1166 return is_external_suspend();
1167 }
1168
1169 // Special method to handle a pending external suspend request
1170 // when a suspend equivalent condition lifts.
1171 bool handle_special_suspend_equivalent_condition() {
1172 assert(is_suspend_equivalent(),
1173 "should only be called in a suspend equivalence condition");
1174 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1175 bool ret = is_external_suspend();
1176 if (!ret) {
1177 // not about to self-suspend so clear suspend equivalence
1178 clear_suspend_equivalent();
1179 }
1180 // implied else:
1181 // We have a pending external suspend request so we leave the
1182 // suspend_equivalent flag set until java_suspend_self() sets
1183 // the ext_suspended flag and clears the suspend_equivalent
1184 // flag. This insures that wait_for_ext_suspend_completion()
1185 // will return consistent values.
1186 return ret;
1187 }
1188
1189 // utility methods to see if we are doing some kind of suspension
1190 bool is_being_ext_suspended() const {
1191 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1192 return is_ext_suspended() || is_external_suspend();
1193 }
1194
1195 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1196
1197 void set_suspend_equivalent() { _suspend_equivalent = true; };
1198 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1199
1200 // Thread.stop support
1201 void send_thread_stop(oop throwable);
1202 AsyncRequests clear_special_runtime_exit_condition() {
1203 AsyncRequests x = _special_runtime_exit_condition;
1204 _special_runtime_exit_condition = _no_async_condition;
1205 return x;
1206 }
1207
1208 // Are any async conditions present?
1209 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1210
1211 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1212
1213 // these next two are also used for self-suspension and async exception support
1214 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1215
1216 // Return true if JavaThread has an asynchronous condition or
1217 // if external suspension is requested.
1218 bool has_special_runtime_exit_condition() {
1219 // We call is_external_suspend() last since external suspend should
1220 // be less common. Because we don't use is_external_suspend_with_lock
1221 // it is possible that we won't see an asynchronous external suspend
1222 // request that has just gotten started, i.e., SR_lock grabbed but
1223 // _external_suspend field change either not made yet or not visible
1224 // yet. However, this is okay because the request is asynchronous and
1225 // we will see the new flag value the next time through. It's also
1226 // possible that the external suspend request is dropped after
1227 // we have checked is_external_suspend(), we will recheck its value
1228 // under SR_lock in java_suspend_self().
1229 return (_special_runtime_exit_condition != _no_async_condition) ||
1230 is_external_suspend() || is_deopt_suspend();
1231 }
1232
1233 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1234
1235 void set_pending_async_exception(oop e) {
1236 _pending_async_exception = e;
1237 _special_runtime_exit_condition = _async_exception;
1238 set_has_async_exception();
1239 }
1240
1241 // Fast-locking support
1242 bool is_lock_owned(address adr) const;
1243
1244 // Accessors for vframe array top
1245 // The linked list of vframe arrays are sorted on sp. This means when we
1246 // unpack the head must contain the vframe array to unpack.
1247 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1248 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1249
1250 // Side structure for defering update of java frame locals until deopt occurs
1251 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1252 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1253
1254 // These only really exist to make debugging deopt problems simpler
1255
1256 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1257 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1258
1259 // The special resourceMark used during deoptimization
1260
1261 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1262 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1263
1264 intptr_t* must_deopt_id() { return _must_deopt_id; }
1265 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1266 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1267
1268 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1269 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1270
1271 Method* callee_target() const { return _callee_target; }
1272 void set_callee_target (Method* x) { _callee_target = x; }
1273
1274 // Oop results of vm runtime calls
1275 oop vm_result() const { return _vm_result; }
1276 void set_vm_result (oop x) { _vm_result = x; }
1277
1278 Metadata* vm_result_2() const { return _vm_result_2; }
1279 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1280
1281 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1282 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1283
1284 // Exception handling for compiled methods
1285 oop exception_oop() const { return _exception_oop; }
1286 address exception_pc() const { return _exception_pc; }
1287 address exception_handler_pc() const { return _exception_handler_pc; }
1288 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1289
1290 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1291 void set_exception_pc(address a) { _exception_pc = a; }
1292 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1293 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1294
1295 void clear_exception_oop_and_pc() {
1296 set_exception_oop(NULL);
1297 set_exception_pc(NULL);
1298 }
1299
1300 // Stack overflow support
1301 inline size_t stack_available(address cur_sp);
1302 address stack_yellow_zone_base()
1303 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1304 size_t stack_yellow_zone_size()
1305 { return StackYellowPages * os::vm_page_size(); }
1306 address stack_red_zone_base()
1307 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1308 size_t stack_red_zone_size()
1309 { return StackRedPages * os::vm_page_size(); }
1310 bool in_stack_yellow_zone(address a)
1311 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1312 bool in_stack_red_zone(address a)
1313 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1314
1315 void create_stack_guard_pages();
1316 void remove_stack_guard_pages();
1317
1318 void enable_stack_yellow_zone();
1319 void disable_stack_yellow_zone();
1320 void enable_stack_red_zone();
1321 void disable_stack_red_zone();
1322
1323 inline bool stack_guard_zone_unused();
1324 inline bool stack_yellow_zone_disabled();
1325 inline bool stack_yellow_zone_enabled();
1326
1327 // Attempt to reguard the stack after a stack overflow may have occurred.
1328 // Returns true if (a) guard pages are not needed on this thread, (b) the
1329 // pages are already guarded, or (c) the pages were successfully reguarded.
1330 // Returns false if there is not enough stack space to reguard the pages, in
1331 // which case the caller should unwind a frame and try again. The argument
1332 // should be the caller's (approximate) sp.
1333 bool reguard_stack(address cur_sp);
1334 // Similar to above but see if current stackpoint is out of the guard area
1335 // and reguard if possible.
1336 bool reguard_stack(void);
1337
1338 address stack_overflow_limit() { return _stack_overflow_limit; }
1339 void set_stack_overflow_limit() {
1340 _stack_overflow_limit = _stack_base - _stack_size +
1341 ((StackShadowPages +
1342 StackYellowPages +
1343 StackRedPages) * os::vm_page_size());
1344 }
1345
1346 // Misc. accessors/mutators
1347 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1348 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1349 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1350
1351 #ifndef PRODUCT
1352 void record_jump(address target, address instr, const char* file, int line);
1353 #endif /* PRODUCT */
1354
1355 // For assembly stub generation
1356 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1357 #ifndef PRODUCT
1358 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1359 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1360 #endif /* PRODUCT */
1361 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1362 static ByteSize last_Java_sp_offset() {
1363 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1364 }
1365 static ByteSize last_Java_pc_offset() {
1366 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1367 }
1368 static ByteSize frame_anchor_offset() {
1369 return byte_offset_of(JavaThread, _anchor);
1370 }
1371 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1372 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1373 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1374 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1375 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1376 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1377 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1378 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1379 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1380 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1381 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1382 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1383 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1384
1385 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1386 static ByteSize should_post_on_exceptions_flag_offset() {
1387 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1388 }
1389
1390 #if INCLUDE_ALL_GCS
1391 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1392 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1393 #endif // INCLUDE_ALL_GCS
1394
1395 // Returns the jni environment for this thread
1396 JNIEnv* jni_environment() { return &_jni_environment; }
1397
1398 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1399 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1400 // Only return NULL if thread is off the thread list; starting to
1401 // exit should not return NULL.
1402 if (thread_from_jni_env->is_terminated()) {
1403 thread_from_jni_env->block_if_vm_exited();
1404 return NULL;
1405 } else {
1406 return thread_from_jni_env;
1407 }
1408 }
1409
1410 // JNI critical regions. These can nest.
1411 bool in_critical() { return _jni_active_critical > 0; }
1412 bool in_last_critical() { return _jni_active_critical == 1; }
1413 void enter_critical() { assert(Thread::current() == this ||
1414 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1415 "this must be current thread or synchronizing");
1416 _jni_active_critical++; }
1417 void exit_critical() { assert(Thread::current() == this,
1418 "this must be current thread");
1419 _jni_active_critical--;
1420 assert(_jni_active_critical >= 0,
1421 "JNI critical nesting problem?"); }
1422
1423 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1424 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1425 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1426 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1427 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1428
1429 // For deadlock detection
1430 int depth_first_number() { return _depth_first_number; }
1431 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1432
1433 private:
1434 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1435
1436 public:
1437 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1438 void add_monitor_chunk(MonitorChunk* chunk);
1439 void remove_monitor_chunk(MonitorChunk* chunk);
1440 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1441 void inc_in_deopt_handler() { _in_deopt_handler++; }
1442 void dec_in_deopt_handler() {
1443 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1444 if (_in_deopt_handler > 0) { // robustness
1445 _in_deopt_handler--;
1446 }
1447 }
1448
1449 private:
1450 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1451
1452 public:
1453
1454 // Frame iteration; calls the function f for all frames on the stack
1455 void frames_do(void f(frame*, const RegisterMap*));
1456
1457 // Memory operations
1458 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1459
1460 // Sweeper operations
1461 void nmethods_do(CodeBlobClosure* cf);
1462
1463 // RedefineClasses Support
1464 void metadata_do(void f(Metadata*));
1465
1466 // Memory management operations
1467 void gc_epilogue();
1468 void gc_prologue();
1469
1470 // Misc. operations
1471 char* name() const { return (char*)get_thread_name(); }
1472 void print_on(outputStream* st) const;
1473 void print() const { print_on(tty); }
1474 void print_value();
1475 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1476 void print_thread_state() const PRODUCT_RETURN;
1477 void print_on_error(outputStream* st, char* buf, int buflen) const;
1478 void verify();
1479 const char* get_thread_name() const;
1480 private:
1481 // factor out low-level mechanics for use in both normal and error cases
1482 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1483 public:
1484 const char* get_threadgroup_name() const;
1485 const char* get_parent_name() const;
1486
1487 // Accessing frames
1488 frame last_frame() {
1489 _anchor.make_walkable(this);
1490 return pd_last_frame();
1491 }
1492 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1493
1494 // Returns method at 'depth' java or native frames down the stack
1495 // Used for security checks
1496 Klass* security_get_caller_class(int depth);
1497
1498 // Print stack trace in external format
1499 void print_stack_on(outputStream* st);
1500 void print_stack() { print_stack_on(tty); }
1501
1502 // Print stack traces in various internal formats
1503 void trace_stack() PRODUCT_RETURN;
1504 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1505 void trace_frames() PRODUCT_RETURN;
1506 void trace_oops() PRODUCT_RETURN;
1507
1508 // Print an annotated view of the stack frames
1509 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1510 void validate_frame_layout() {
1511 print_frame_layout(0, true);
1512 }
1513
1514 // Returns the number of stack frames on the stack
1515 int depth() const;
1516
1517 // Function for testing deoptimization
1518 void deoptimize();
1519 void make_zombies();
1520
1521 void deoptimized_wrt_marked_nmethods();
1522
1523 // Profiling operation (see fprofile.cpp)
1524 public:
1525 bool profile_last_Java_frame(frame* fr);
1526
1527 private:
1528 ThreadProfiler* _thread_profiler;
1529 private:
1530 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1531 friend class FlatProfilerTask; // uses get_thread_profiler.
1532 friend class ThreadProfilerMark; // uses get_thread_profiler.
1533 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1534 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1535 ThreadProfiler* result = _thread_profiler;
1536 _thread_profiler = tp;
1537 return result;
1538 }
1539
1540 public:
1541 // Returns the running thread as a JavaThread
1542 static inline JavaThread* current();
1543
1544 // Returns the active Java thread. Do not use this if you know you are calling
1545 // from a JavaThread, as it's slower than JavaThread::current. If called from
1546 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1547 // operation. You may not want that either.
1548 static JavaThread* active();
1549
1550 inline CompilerThread* as_CompilerThread();
1551
1552 public:
1553 virtual void run();
1554 void thread_main_inner();
1555
1556 private:
1557 // PRIVILEGED STACK
1558 PrivilegedElement* _privileged_stack_top;
1559 GrowableArray<oop>* _array_for_gc;
1560 public:
1561
1562 // Returns the privileged_stack information.
1563 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1564 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1565 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1566
1567 public:
1568 // Thread local information maintained by JVMTI.
1569 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1570 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1571 // getter is used to get this JavaThread's JvmtiThreadState if it has
1572 // one which means NULL can be returned. JvmtiThreadState::state_for()
1573 // is used to get the specified JavaThread's JvmtiThreadState if it has
1574 // one or it allocates a new JvmtiThreadState for the JavaThread and
1575 // returns it. JvmtiThreadState::state_for() will return NULL only if
1576 // the specified JavaThread is exiting.
1577 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1578 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1579 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1580 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1581
1582 // JVMTI PopFrame support
1583 // Setting and clearing popframe_condition
1584 // All of these enumerated values are bits. popframe_pending
1585 // indicates that a PopFrame() has been requested and not yet been
1586 // completed. popframe_processing indicates that that PopFrame() is in
1587 // the process of being completed. popframe_force_deopt_reexecution_bit
1588 // indicates that special handling is required when returning to a
1589 // deoptimized caller.
1590 enum PopCondition {
1591 popframe_inactive = 0x00,
1592 popframe_pending_bit = 0x01,
1593 popframe_processing_bit = 0x02,
1594 popframe_force_deopt_reexecution_bit = 0x04
1595 };
1596 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1597 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1598 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1599 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1600 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1601 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1602 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1603 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1604 #ifdef CC_INTERP
1605 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1606 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1607 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1608 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1609 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1610 #endif
1611
1612 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1613 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1614 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1615
1616 private:
1617 // Saved incoming arguments to popped frame.
1618 // Used only when popped interpreted frame returns to deoptimized frame.
1619 void* _popframe_preserved_args;
1620 int _popframe_preserved_args_size;
1621
1622 public:
1623 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1624 void* popframe_preserved_args();
1625 ByteSize popframe_preserved_args_size();
1626 WordSize popframe_preserved_args_size_in_words();
1627 void popframe_free_preserved_args();
1628
1629
1630 private:
1631 JvmtiThreadState *_jvmti_thread_state;
1632 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1633
1634 // Used by the interpreter in fullspeed mode for frame pop, method
1635 // entry, method exit and single stepping support. This field is
1636 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1637 // It can be set to zero asynchronously (i.e., without a VM operation
1638 // or a lock) so we have to be very careful.
1639 int _interp_only_mode;
1640
1641 public:
1642 // used by the interpreter for fullspeed debugging support (see above)
1643 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1644 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1645 int get_interp_only_mode() { return _interp_only_mode; }
1646 void increment_interp_only_mode() { ++_interp_only_mode; }
1647 void decrement_interp_only_mode() { --_interp_only_mode; }
1648
1649 // support for cached flag that indicates whether exceptions need to be posted for this thread
1650 // if this is false, we can avoid deoptimizing when events are thrown
1651 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1652 private:
1653 int _should_post_on_exceptions_flag;
1654
1655 public:
1656 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1657 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1658
1659 private:
1660 ThreadStatistics *_thread_stat;
1661
1662 public:
1663 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1664
1665 // Return a blocker object for which this thread is blocked parking.
1666 oop current_park_blocker();
1667
1668 private:
1669 static size_t _stack_size_at_create;
1670
1671 public:
1672 static inline size_t stack_size_at_create(void) {
1673 return _stack_size_at_create;
1674 }
1675 static inline void set_stack_size_at_create(size_t value) {
1676 _stack_size_at_create = value;
1677 }
1678
1679 #if INCLUDE_ALL_GCS
1680 // SATB marking queue support
1681 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1682 static SATBMarkQueueSet& satb_mark_queue_set() {
1683 return _satb_mark_queue_set;
1684 }
1685
1686 // Dirty card queue support
1687 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1688 static DirtyCardQueueSet& dirty_card_queue_set() {
1689 return _dirty_card_queue_set;
1690 }
1691 #endif // INCLUDE_ALL_GCS
1692
1693 // This method initializes the SATB and dirty card queues before a
1694 // JavaThread is added to the Java thread list. Right now, we don't
1695 // have to do anything to the dirty card queue (it should have been
1696 // activated when the thread was created), but we have to activate
1697 // the SATB queue if the thread is created while a marking cycle is
1698 // in progress. The activation / de-activation of the SATB queues at
1699 // the beginning / end of a marking cycle is done during safepoints
1700 // so we have to make sure this method is called outside one to be
1701 // able to safely read the active field of the SATB queue set. Right
1702 // now, it is called just before the thread is added to the Java
1703 // thread list in the Threads::add() method. That method is holding
1704 // the Threads_lock which ensures we are outside a safepoint. We
1705 // cannot do the obvious and set the active field of the SATB queue
1706 // when the thread is created given that, in some cases, safepoints
1707 // might happen between the JavaThread constructor being called and the
1708 // thread being added to the Java thread list (an example of this is
1709 // when the structure for the DestroyJavaVM thread is created).
1710 #if INCLUDE_ALL_GCS
1711 void initialize_queues();
1712 #else // INCLUDE_ALL_GCS
1713 void initialize_queues() { }
1714 #endif // INCLUDE_ALL_GCS
1715
1716 // Machine dependent stuff
1717 #ifdef TARGET_OS_ARCH_linux_x86
1718 # include "thread_linux_x86.hpp"
1719 #endif
1720 #ifdef TARGET_OS_ARCH_linux_sparc
1721 # include "thread_linux_sparc.hpp"
1722 #endif
1723 #ifdef TARGET_OS_ARCH_linux_zero
1724 # include "thread_linux_zero.hpp"
1725 #endif
1726 #ifdef TARGET_OS_ARCH_solaris_x86
1727 # include "thread_solaris_x86.hpp"
1728 #endif
1729 #ifdef TARGET_OS_ARCH_solaris_sparc
1730 # include "thread_solaris_sparc.hpp"
1731 #endif
1732 #ifdef TARGET_OS_ARCH_windows_x86
1733 # include "thread_windows_x86.hpp"
1734 #endif
1735 #ifdef TARGET_OS_ARCH_linux_arm
1736 # include "thread_linux_arm.hpp"
1737 #endif
1738 #ifdef TARGET_OS_ARCH_linux_ppc
1739 # include "thread_linux_ppc.hpp"
1740 #endif
1741 #ifdef TARGET_OS_ARCH_aix_ppc
1742 # include "thread_aix_ppc.hpp"
1743 #endif
1744 #ifdef TARGET_OS_ARCH_bsd_x86
1745 # include "thread_bsd_x86.hpp"
1746 #endif
1747 #ifdef TARGET_OS_ARCH_bsd_zero
1748 # include "thread_bsd_zero.hpp"
1749 #endif
1750
1751
1752 public:
1753 void set_blocked_on_compilation(bool value) {
1754 _blocked_on_compilation = value;
1755 }
1756
1757 bool blocked_on_compilation() {
1758 return _blocked_on_compilation;
1759 }
1760 protected:
1761 bool _blocked_on_compilation;
1762
1763
1764 // JSR166 per-thread parker
1765 private:
1766 Parker* _parker;
1767 public:
1768 Parker* parker() { return _parker; }
1769
1770 // Biased locking support
1771 private:
1772 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1773 public:
1774 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1775 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1776
1777 // clearing/querying jni attach status
1778 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1779 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1780 inline void set_done_attaching_via_jni();
1781 private:
1782 // This field is used to determine if a thread has claimed
1783 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1784 // otherwise its value is the par_id that has been claimed.
1785 uint _claimed_par_id;
1786 public:
1787 uint get_claimed_par_id() { return _claimed_par_id; }
1788 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1789 };
1790
1791 // Inline implementation of JavaThread::current
1792 inline JavaThread* JavaThread::current() {
1793 Thread* thread = ThreadLocalStorage::thread();
1794 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1795 return (JavaThread*)thread;
1796 }
1797
1798 inline CompilerThread* JavaThread::as_CompilerThread() {
1799 assert(is_Compiler_thread(), "just checking");
1800 return (CompilerThread*)this;
1801 }
1802
1803 inline bool JavaThread::stack_guard_zone_unused() {
1804 return _stack_guard_state == stack_guard_unused;
1805 }
1806
1807 inline bool JavaThread::stack_yellow_zone_disabled() {
1808 return _stack_guard_state == stack_guard_yellow_disabled;
1809 }
1810
1811 inline bool JavaThread::stack_yellow_zone_enabled() {
1812 #ifdef ASSERT
1813 if (os::uses_stack_guard_pages() &&
1814 !(DisablePrimordialThreadGuardPages && os::is_primordial_thread())) {
1815 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1816 }
1817 #endif
1818 return _stack_guard_state == stack_guard_enabled;
1819 }
1820
1821 inline size_t JavaThread::stack_available(address cur_sp) {
1822 // This code assumes java stacks grow down
1823 address low_addr; // Limit on the address for deepest stack depth
1824 if ( _stack_guard_state == stack_guard_unused) {
1825 low_addr = stack_base() - stack_size();
1826 } else {
1827 low_addr = stack_yellow_zone_base();
1828 }
1829 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1830 }
1831
1832 // A thread used for Compilation.
1833 class CompilerThread : public JavaThread {
1834 friend class VMStructs;
1835 private:
1836 CompilerCounters* _counters;
1837
1838 ciEnv* _env;
1839 CompileLog* _log;
1840 CompileTask* _task;
1841 CompileQueue* _queue;
1842 BufferBlob* _buffer_blob;
1843
1844 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1845 AbstractCompiler* _compiler;
1846
1847 public:
1848
1849 static CompilerThread* current();
1850
1851 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1852
1853 bool is_Compiler_thread() const { return true; }
1854 // Hide this compiler thread from external view.
1855 bool is_hidden_from_external_view() const { return true; }
1856
1857 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1858 AbstractCompiler* compiler() const { return _compiler; }
1859
1860 CompileQueue* queue() const { return _queue; }
1861 CompilerCounters* counters() const { return _counters; }
1862
1863 // Get/set the thread's compilation environment.
1864 ciEnv* env() { return _env; }
1865 void set_env(ciEnv* env) { _env = env; }
1866
1867 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1868 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1869
1870 // Get/set the thread's logging information
1871 CompileLog* log() { return _log; }
1872 void init_log(CompileLog* log) {
1873 // Set once, for good.
1874 assert(_log == NULL, "set only once");
1875 _log = log;
1876 }
1877
1878 // GC support
1879 // Apply "f->do_oop" to all root oops in "this".
1880 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1881 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1882
1883 #ifndef PRODUCT
1884 private:
1885 IdealGraphPrinter *_ideal_graph_printer;
1886 public:
1887 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1888 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1889 #endif
1890
1891 // Get/set the thread's current task
1892 CompileTask* task() { return _task; }
1893 void set_task(CompileTask* task) { _task = task; }
1894
1895 // Track the nmethod currently being scanned by the sweeper
1896 void set_scanned_nmethod(nmethod* nm) {
1897 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1898 _scanned_nmethod = nm;
1899 }
1900 };
1901
1902 inline CompilerThread* CompilerThread::current() {
1903 return JavaThread::current()->as_CompilerThread();
1904 }
1905
1906
1907 // The active thread queue. It also keeps track of the current used
1908 // thread priorities.
1909 class Threads: AllStatic {
1910 friend class VMStructs;
1911 private:
1912 static JavaThread* _thread_list;
1913 static int _number_of_threads;
1914 static int _number_of_non_daemon_threads;
1915 static int _return_code;
1916 #ifdef ASSERT
1917 static bool _vm_complete;
1918 #endif
1919
1920 public:
1921 // Thread management
1922 // force_daemon is a concession to JNI, where we may need to add a
1923 // thread to the thread list before allocating its thread object
1924 static void add(JavaThread* p, bool force_daemon = false);
1925 static void remove(JavaThread* p);
1926 static bool includes(JavaThread* p);
1927 static JavaThread* first() { return _thread_list; }
1928 static void threads_do(ThreadClosure* tc);
1929
1930 // Initializes the vm and creates the vm thread
1931 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1932 static void convert_vm_init_libraries_to_agents();
1933 static void create_vm_init_libraries();
1934 static void create_vm_init_agents();
1935 static void shutdown_vm_agents();
1936 static bool destroy_vm();
1937 // Supported VM versions via JNI
1938 // Includes JNI_VERSION_1_1
1939 static jboolean is_supported_jni_version_including_1_1(jint version);
1940 // Does not include JNI_VERSION_1_1
1941 static jboolean is_supported_jni_version(jint version);
1942
1943 // Garbage collection
1944 static void follow_other_roots(void f(oop*));
1945
1946 // Apply "f->do_oop" to all root oops in all threads.
1947 // This version may only be called by sequential code.
1948 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1949 // This version may be called by sequential or parallel code.
1950 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1951 // This creates a list of GCTasks, one per thread.
1952 static void create_thread_roots_tasks(GCTaskQueue* q);
1953 // This creates a list of GCTasks, one per thread, for marking objects.
1954 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1955
1956 // Apply "f->do_oop" to roots in all threads that
1957 // are part of compiled frames
1958 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1959
1960 static void convert_hcode_pointers();
1961 static void restore_hcode_pointers();
1962
1963 // Sweeper
1964 static void nmethods_do(CodeBlobClosure* cf);
1965
1966 // RedefineClasses support
1967 static void metadata_do(void f(Metadata*));
1968
1969 static void gc_epilogue();
1970 static void gc_prologue();
1971 #ifdef ASSERT
1972 static bool is_vm_complete() { return _vm_complete; }
1973 #endif
1974
1975 // Verification
1976 static void verify();
1977 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1978 static void print(bool print_stacks, bool internal_format) {
1979 // this function is only used by debug.cpp
1980 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1981 }
1982 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1983
1984 // Get Java threads that are waiting to enter a monitor. If doLock
1985 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1986 // VM needs to be at a safepoint.
1987 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1988 address monitor, bool doLock);
1989
1990 // Get owning Java thread from the monitor's owner field. If doLock
1991 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1992 // VM needs to be at a safepoint.
1993 static JavaThread *owning_thread_from_monitor_owner(address owner,
1994 bool doLock);
1995
1996 // Number of threads on the active threads list
1997 static int number_of_threads() { return _number_of_threads; }
1998 // Number of non-daemon threads on the active threads list
1999 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2000
2001 // Deoptimizes all frames tied to marked nmethods
2002 static void deoptimized_wrt_marked_nmethods();
2003
2004 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2005
2006 };
2007
2008
2009 // Thread iterator
2010 class ThreadClosure: public StackObj {
2011 public:
2012 virtual void do_thread(Thread* thread) = 0;
2013 };
2014
2015 class SignalHandlerMark: public StackObj {
2016 private:
2017 Thread* _thread;
2018 public:
2019 SignalHandlerMark(Thread* t) {
2020 _thread = t;
2021 if (_thread) _thread->enter_signal_handler();
2022 }
2023 ~SignalHandlerMark() {
2024 if (_thread) _thread->leave_signal_handler();
2025 _thread = NULL;
2026 }
2027 };
2028
2029
2030 #endif // SHARE_VM_RUNTIME_THREAD_HPP