1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 #define SHARE_VM_RUNTIME_THREAD_HPP
27
28 #include "gc/shared/threadLocalAllocBuffer.hpp"
29 #include "memory/allocation.hpp"
30 #include "oops/oop.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvmtiExport.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/javaFrameAnchor.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/mutexLocker.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/osThread.hpp"
39 #include "runtime/park.hpp"
40 #include "runtime/safepoint.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "runtime/threadLocalStorage.hpp"
43 #include "runtime/thread_ext.hpp"
44 #include "runtime/unhandledOops.hpp"
45 #include "trace/traceBackend.hpp"
46 #include "trace/traceMacros.hpp"
47 #include "utilities/exceptions.hpp"
48 #include "utilities/macros.hpp"
49 #if INCLUDE_ALL_GCS
50 #include "gc/g1/dirtyCardQueue.hpp"
51 #include "gc/g1/satbMarkQueue.hpp"
52 #endif // INCLUDE_ALL_GCS
53 #ifdef ZERO
54 # include "stack_zero.hpp"
55 #endif
56
57 class ThreadSafepointState;
58 class ThreadProfiler;
59
60 class JvmtiThreadState;
61 class JvmtiGetLoadedClassesClosure;
62 class ThreadStatistics;
63 class ConcurrentLocksDump;
64 class ParkEvent;
65 class Parker;
66
67 class ciEnv;
68 class CompileThread;
69 class CompileLog;
70 class CompileTask;
71 class CompileQueue;
72 class CompilerCounters;
73 class vframeArray;
74
75 class DeoptResourceMark;
76 class jvmtiDeferredLocalVariableSet;
77
78 class GCTaskQueue;
79 class ThreadClosure;
80 class IdealGraphPrinter;
81
82 class Metadata;
83 template <class T, MEMFLAGS F> class ChunkedList;
84 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
85
86 DEBUG_ONLY(class ResourceMark;)
87
88 class WorkerThread;
89
90 // Class hierarchy
91 // - Thread
92 // - NamedThread
93 // - VMThread
94 // - ConcurrentGCThread
95 // - WorkerThread
96 // - GangWorker
97 // - GCTaskThread
98 // - JavaThread
99 // - various subclasses eg CompilerThread, ServiceThread
100 // - WatcherThread
101
102 class Thread: public ThreadShadow {
103 friend class VMStructs;
104 friend class JVMCIVMStructs;
105 private:
106
107 #ifndef USE_LIBRARY_BASED_TLS_ONLY
108 // Current thread is maintained as a thread-local variable
109 static THREAD_LOCAL_DECL Thread* _thr_current;
110 #endif
111
112 // Exception handling
113 // (Note: _pending_exception and friends are in ThreadShadow)
114 //oop _pending_exception; // pending exception for current thread
115 // const char* _exception_file; // file information for exception (debugging only)
116 // int _exception_line; // line information for exception (debugging only)
117 protected:
118 // Support for forcing alignment of thread objects for biased locking
119 void* _real_malloc_address;
120 public:
121 void* operator new(size_t size) throw() { return allocate(size, true); }
122 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
123 return allocate(size, false); }
124 void operator delete(void* p);
125
126 protected:
127 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
128 private:
129
130 // ***************************************************************
131 // Suspend and resume support
132 // ***************************************************************
133 //
134 // VM suspend/resume no longer exists - it was once used for various
135 // things including safepoints but was deprecated and finally removed
136 // in Java 7. Because VM suspension was considered "internal" Java-level
137 // suspension was considered "external", and this legacy naming scheme
138 // remains.
139 //
140 // External suspend/resume requests come from JVM_SuspendThread,
141 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
142 // ResumeThread. External
143 // suspend requests cause _external_suspend to be set and external
144 // resume requests cause _external_suspend to be cleared.
145 // External suspend requests do not nest on top of other external
146 // suspend requests. The higher level APIs reject suspend requests
147 // for already suspended threads.
148 //
149 // The external_suspend
150 // flag is checked by has_special_runtime_exit_condition() and java thread
151 // will self-suspend when handle_special_runtime_exit_condition() is
152 // called. Most uses of the _thread_blocked state in JavaThreads are
153 // considered the same as being externally suspended; if the blocking
154 // condition lifts, the JavaThread will self-suspend. Other places
155 // where VM checks for external_suspend include:
156 // + mutex granting (do not enter monitors when thread is suspended)
157 // + state transitions from _thread_in_native
158 //
159 // In general, java_suspend() does not wait for an external suspend
160 // request to complete. When it returns, the only guarantee is that
161 // the _external_suspend field is true.
162 //
163 // wait_for_ext_suspend_completion() is used to wait for an external
164 // suspend request to complete. External suspend requests are usually
165 // followed by some other interface call that requires the thread to
166 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
167 // the interface that requires quiescence, we give the JavaThread a
168 // chance to self-suspend before we need it to be quiescent. This
169 // improves overall suspend/query performance.
170 //
171 // _suspend_flags controls the behavior of java_ suspend/resume.
172 // It must be set under the protection of SR_lock. Read from the flag is
173 // OK without SR_lock as long as the value is only used as a hint.
174 // (e.g., check _external_suspend first without lock and then recheck
175 // inside SR_lock and finish the suspension)
176 //
177 // _suspend_flags is also overloaded for other "special conditions" so
178 // that a single check indicates whether any special action is needed
179 // eg. for async exceptions.
180 // -------------------------------------------------------------------
181 // Notes:
182 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
183 // but we still update its value to keep other part of the system (mainly
184 // JVMTI) happy. ThreadState is legacy code (see notes in
185 // osThread.hpp).
186 //
187 // 2. It would be more natural if set_external_suspend() is private and
188 // part of java_suspend(), but that probably would affect the suspend/query
189 // performance. Need more investigation on this.
190
191 // suspend/resume lock: used for self-suspend
192 Monitor* _SR_lock;
193
194 protected:
195 enum SuspendFlags {
196 // NOTE: avoid using the sign-bit as cc generates different test code
197 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
198
199 _external_suspend = 0x20000000U, // thread is asked to self suspend
200 _ext_suspended = 0x40000000U, // thread has self-suspended
201 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
202
203 _has_async_exception = 0x00000001U, // there is a pending async exception
204 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
205 };
206
207 // various suspension related flags - atomically updated
208 // overloaded for async exception checking in check_special_condition_for_native_trans.
209 volatile uint32_t _suspend_flags;
210
211 private:
212 int _num_nested_signal;
213
214 DEBUG_ONLY(bool _suspendible_thread;)
215
216 public:
217 void enter_signal_handler() { _num_nested_signal++; }
218 void leave_signal_handler() { _num_nested_signal--; }
219 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
220
221 #ifdef ASSERT
222 void set_suspendible_thread() {
223 _suspendible_thread = true;
224 }
225
226 void clear_suspendible_thread() {
227 _suspendible_thread = false;
228 }
229
230 bool is_suspendible_thread() { return _suspendible_thread; }
231 #endif
232
233 private:
234 // Active_handles points to a block of handles
235 JNIHandleBlock* _active_handles;
236
237 // One-element thread local free list
238 JNIHandleBlock* _free_handle_block;
239
240 // Point to the last handle mark
241 HandleMark* _last_handle_mark;
242
243 // The parity of the last strong_roots iteration in which this thread was
244 // claimed as a task.
245 jint _oops_do_parity;
246
247 public:
248 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
249 HandleMark* last_handle_mark() const { return _last_handle_mark; }
250 private:
251
252 // debug support for checking if code does allow safepoints or not
253 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
254 // mutex, or blocking on an object synchronizer (Java locking).
255 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
256 // If !allow_allocation(), then an assertion failure will happen during allocation
257 // (Hence, !allow_safepoint() => !allow_allocation()).
258 //
259 // The two classes NoSafepointVerifier and No_Allocation_Verifier are used to set these counters.
260 //
261 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
262 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
263
264 // Used by SkipGCALot class.
265 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
266
267 friend class NoAllocVerifier;
268 friend class NoSafepointVerifier;
269 friend class PauseNoSafepointVerifier;
270 friend class GCLocker;
271
272 ThreadLocalAllocBuffer _tlab; // Thread-local eden
273 ThreadLocalAllocBuffer _gclab; // Thread-local allocation buffer for GC (e.g. evacuation)
274 jlong _allocated_bytes; // Cumulative number of bytes allocated on
275 // the Java heap
276 jlong _allocated_bytes_gclab; // Cumulative number of bytes allocated on
277 // the Java heap, in GCLABs
278
279 mutable TRACE_DATA _trace_data; // Thread-local data for tracing
280
281 ThreadExt _ext;
282
283 int _vm_operation_started_count; // VM_Operation support
284 int _vm_operation_completed_count; // VM_Operation support
285
286 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
287 // is waiting to lock
288 bool _current_pending_monitor_is_from_java; // locking is from Java code
289
290 // ObjectMonitor on which this thread called Object.wait()
291 ObjectMonitor* _current_waiting_monitor;
292
293 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
294 public:
295 ObjectMonitor* omFreeList;
296 int omFreeCount; // length of omFreeList
297 int omFreeProvision; // reload chunk size
298 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
299 int omInUseCount; // length of omInUseList
300
301 #ifdef ASSERT
302 private:
303 bool _visited_for_critical_count;
304
305 public:
306 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
307 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
308 #endif
309
310 public:
311 enum {
312 is_definitely_current_thread = true
313 };
314
315 // Constructor
316 Thread();
317 virtual ~Thread();
318
319 // Manage Thread::current()
320 void initialize_thread_current();
321 void clear_thread_current(); // TLS cleanup needed before threads terminate
322
323 public:
324 // thread entry point
325 virtual void run();
326
327 // Testers
328 virtual bool is_VM_thread() const { return false; }
329 virtual bool is_Java_thread() const { return false; }
330 virtual bool is_Compiler_thread() const { return false; }
331 virtual bool is_Code_cache_sweeper_thread() const { return false; }
332 virtual bool is_hidden_from_external_view() const { return false; }
333 virtual bool is_jvmti_agent_thread() const { return false; }
334 // True iff the thread can perform GC operations at a safepoint.
335 // Generally will be true only of VM thread and parallel GC WorkGang
336 // threads.
337 virtual bool is_GC_task_thread() const { return false; }
338 virtual bool is_Watcher_thread() const { return false; }
339 virtual bool is_ConcurrentGC_thread() const { return false; }
340 virtual bool is_Named_thread() const { return false; }
341 virtual bool is_Worker_thread() const { return false; }
342
343 // Can this thread make Java upcalls
344 virtual bool can_call_java() const { return false; }
345
346 // Casts
347 virtual WorkerThread* as_Worker_thread() const { return NULL; }
348
349 virtual char* name() const { return (char*)"Unknown thread"; }
350
351 // Returns the current thread (ASSERTS if NULL)
352 static inline Thread* current();
353 // Returns the current thread, or NULL if not attached
354 static inline Thread* current_or_null();
355 // Returns the current thread, or NULL if not attached, and is
356 // safe for use from signal-handlers
357 static inline Thread* current_or_null_safe();
358
359 // Common thread operations
360 static void set_priority(Thread* thread, ThreadPriority priority);
361 static ThreadPriority get_priority(const Thread* const thread);
362 static void start(Thread* thread);
363 static void interrupt(Thread* thr);
364 static bool is_interrupted(Thread* thr, bool clear_interrupted);
365
366 void set_native_thread_name(const char *name) {
367 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
368 os::set_native_thread_name(name);
369 }
370
371 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
372 Monitor* SR_lock() const { return _SR_lock; }
373
374 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
375
376 inline void set_suspend_flag(SuspendFlags f);
377 inline void clear_suspend_flag(SuspendFlags f);
378
379 inline void set_has_async_exception();
380 inline void clear_has_async_exception();
381
382 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
383
384 inline void set_critical_native_unlock();
385 inline void clear_critical_native_unlock();
386
387 // Support for Unhandled Oop detection
388 // Add the field for both, fastdebug and debug, builds to keep
389 // Thread's fields layout the same.
390 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build.
391 #ifdef CHECK_UNHANDLED_OOPS
392 private:
393 UnhandledOops* _unhandled_oops;
394 #elif defined(ASSERT)
395 private:
396 void* _unhandled_oops;
397 #endif
398 #ifdef CHECK_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 public:
412 #ifndef PRODUCT
413 bool skip_gcalot() { return _skip_gcalot; }
414 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
415 #endif
416
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(false);
445 gclab().initialize(true);
446 }
447 }
448
449 // Thread-Local GC Allocation Buffer (GCLAB) support
450 ThreadLocalAllocBuffer& gclab() { return _gclab; }
451
452 jlong allocated_bytes() { return _allocated_bytes; }
453 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
454 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
455 inline jlong cooked_allocated_bytes();
456
457 jlong allocated_bytes_gclab() { return _allocated_bytes_gclab; }
458 void set_allocated_bytes_gclab(jlong value) { _allocated_bytes_gclab = value; }
459 void incr_allocated_bytes_gclab(jlong size) { _allocated_bytes_gclab += size; }
460
461 TRACE_DEFINE_THREAD_TRACE_DATA_OFFSET;
462 TRACE_DATA* trace_data() const { return &_trace_data; }
463
464 const ThreadExt& ext() const { return _ext; }
465 ThreadExt& ext() { return _ext; }
466
467 // VM operation support
468 int vm_operation_ticket() { return ++_vm_operation_started_count; }
469 int vm_operation_completed_count() { return _vm_operation_completed_count; }
470 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
471
472 // For tracking the heavyweight monitor the thread is pending on.
473 ObjectMonitor* current_pending_monitor() {
474 return _current_pending_monitor;
475 }
476 void set_current_pending_monitor(ObjectMonitor* monitor) {
477 _current_pending_monitor = monitor;
478 }
479 void set_current_pending_monitor_is_from_java(bool from_java) {
480 _current_pending_monitor_is_from_java = from_java;
481 }
482 bool current_pending_monitor_is_from_java() {
483 return _current_pending_monitor_is_from_java;
484 }
485
486 // For tracking the ObjectMonitor on which this thread called Object.wait()
487 ObjectMonitor* current_waiting_monitor() {
488 return _current_waiting_monitor;
489 }
490 void set_current_waiting_monitor(ObjectMonitor* monitor) {
491 _current_waiting_monitor = monitor;
492 }
493
494 // GC support
495 // Apply "f->do_oop" to all root oops in "this".
496 // Used by JavaThread::oops_do.
497 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
498 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf);
499
500 // Handles the parallel case for the method below.
501 private:
502 bool claim_oops_do_par_case(int collection_parity);
503 public:
504 // Requires that "collection_parity" is that of the current roots
505 // iteration. If "is_par" is false, sets the parity of "this" to
506 // "collection_parity", and returns "true". If "is_par" is true,
507 // uses an atomic instruction to set the current threads parity to
508 // "collection_parity", if it is not already. Returns "true" iff the
509 // calling thread does the update, this indicates that the calling thread
510 // has claimed the thread's stack as a root groop in the current
511 // collection.
512 bool claim_oops_do(bool is_par, int collection_parity) {
513 if (!is_par) {
514 _oops_do_parity = collection_parity;
515 return true;
516 } else {
517 return claim_oops_do_par_case(collection_parity);
518 }
519 }
520
521 // jvmtiRedefineClasses support
522 void metadata_handles_do(void f(Metadata*));
523
524 // Used by fast lock support
525 virtual bool is_lock_owned(address adr) const;
526
527 // Check if address is in the stack of the thread (not just for locks).
528 // Warning: the method can only be used on the running thread
529 bool is_in_stack(address adr) const;
530 // Check if address is in the usable part of the stack (excludes protected
531 // guard pages)
532 bool is_in_usable_stack(address adr) const;
533
534 // Sets this thread as starting thread. Returns failure if thread
535 // creation fails due to lack of memory, too many threads etc.
536 bool set_as_starting_thread();
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 void set_stack_base(address base) { _stack_base = base; }
561 size_t stack_size() const { return _stack_size; }
562 void set_stack_size(size_t size) { _stack_size = size; }
563 address stack_end() const { return stack_base() - stack_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_end());
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 virtual 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 int oops_do_parity() const { return _oops_do_parity; }
599
600 // Deadlock detection
601 bool allow_allocation() { return _allow_allocation_count == 0; }
602 ResourceMark* current_resource_mark() { return _current_resource_mark; }
603 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
604 #endif
605
606 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
607
608 private:
609 volatile int _jvmti_env_iteration_count;
610
611 public:
612 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
613 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
614 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
615
616 // Code generation
617 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
618 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
619 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
620
621 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
622 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
623
624 #define TLAB_FIELD_OFFSET(name) \
625 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
626
627 TLAB_FIELD_OFFSET(start)
628 TLAB_FIELD_OFFSET(end)
629 TLAB_FIELD_OFFSET(top)
630 TLAB_FIELD_OFFSET(pf_top)
631 TLAB_FIELD_OFFSET(size) // desired_size
632 TLAB_FIELD_OFFSET(refill_waste_limit)
633 TLAB_FIELD_OFFSET(number_of_refills)
634 TLAB_FIELD_OFFSET(fast_refill_waste)
635 TLAB_FIELD_OFFSET(slow_allocations)
636
637 #undef TLAB_FIELD_OFFSET
638
639 static ByteSize gclab_start_offset() { return byte_offset_of(Thread, _gclab) + ThreadLocalAllocBuffer::start_offset(); }
640 static ByteSize gclab_top_offset() { return byte_offset_of(Thread, _gclab) + ThreadLocalAllocBuffer::top_offset(); }
641 static ByteSize gclab_end_offset() { return byte_offset_of(Thread, _gclab) + ThreadLocalAllocBuffer::end_offset(); }
642
643 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
644
645 public:
646 volatile intptr_t _Stalled;
647 volatile int _TypeTag;
648 ParkEvent * _ParkEvent; // for synchronized()
649 ParkEvent * _SleepEvent; // for Thread.sleep
650 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor
651 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease
652 int NativeSyncRecursion; // diagnostic
653
654 volatile int _OnTrap; // Resume-at IP delta
655 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
656 jint _hashStateX; // thread-specific hashCode generator state
657 jint _hashStateY;
658 jint _hashStateZ;
659 void * _schedctl;
660
661
662 volatile jint rng[4]; // RNG for spin loop
663
664 // Low-level leaf-lock primitives used to implement synchronization
665 // and native monitor-mutex infrastructure.
666 // Not for general synchronization use.
667 static void SpinAcquire(volatile int * Lock, const char * Name);
668 static void SpinRelease(volatile int * Lock);
669 static void muxAcquire(volatile intptr_t * Lock, const char * Name);
670 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev);
671 static void muxRelease(volatile intptr_t * Lock);
672 };
673
674 // Inline implementation of Thread::current()
675 inline Thread* Thread::current() {
676 Thread* current = current_or_null();
677 assert(current != NULL, "Thread::current() called on detached thread");
678 return current;
679 }
680
681 inline Thread* Thread::current_or_null() {
682 #ifndef USE_LIBRARY_BASED_TLS_ONLY
683 return _thr_current;
684 #else
685 return ThreadLocalStorage::thread();
686 #endif
687 }
688
689 inline Thread* Thread::current_or_null_safe() {
690 return ThreadLocalStorage::thread();
691 }
692
693 // Name support for threads. non-JavaThread subclasses with multiple
694 // uniquely named instances should derive from this.
695 class NamedThread: public Thread {
696 friend class VMStructs;
697 enum {
698 max_name_len = 64
699 };
700 private:
701 char* _name;
702 // log JavaThread being processed by oops_do
703 JavaThread* _processed_thread;
704 uint _gc_id; // The current GC id when a thread takes part in GC
705
706 public:
707 NamedThread();
708 ~NamedThread();
709 // May only be called once per thread.
710 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
711 void initialize_named_thread();
712 virtual bool is_Named_thread() const { return true; }
713 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
714 JavaThread *processed_thread() { return _processed_thread; }
715 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
716 virtual void print_on(outputStream* st) const;
717
718 void set_gc_id(uint gc_id) { _gc_id = gc_id; }
719 uint gc_id() { return _gc_id; }
720 };
721
722 // Worker threads are named and have an id of an assigned work.
723 class WorkerThread: public NamedThread {
724 private:
725 uint _id;
726 public:
727 WorkerThread() : _id(0) { }
728 virtual bool is_Worker_thread() const { return true; }
729
730 virtual WorkerThread* as_Worker_thread() const {
731 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
732 return (WorkerThread*) this;
733 }
734
735 void set_id(uint work_id) { _id = work_id; }
736 uint id() const { return _id; }
737 };
738
739 // A single WatcherThread is used for simulating timer interrupts.
740 class WatcherThread: public Thread {
741 friend class VMStructs;
742 public:
743 virtual void run();
744
745 private:
746 static WatcherThread* _watcher_thread;
747
748 static bool _startable;
749 // volatile due to at least one lock-free read
750 volatile static bool _should_terminate;
751
752 os::WatcherThreadCrashProtection* _crash_protection;
753 public:
754 enum SomeConstants {
755 delay_interval = 10 // interrupt delay in milliseconds
756 };
757
758 // Constructor
759 WatcherThread();
760
761 // No destruction allowed
762 ~WatcherThread() {
763 guarantee(false, "WatcherThread deletion must fix the race with VM termination");
764 }
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 unpark();
773
774 // Returns the single instance of WatcherThread
775 static WatcherThread* watcher_thread() { return _watcher_thread; }
776
777 // Create and start the single instance of WatcherThread, or stop it on shutdown
778 static void start();
779 static void stop();
780 // Only allow start once the VM is sufficiently initialized
781 // Otherwise the first task to enroll will trigger the start
782 static void make_startable();
783
784 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
785 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
786 _crash_protection = crash_protection;
787 }
788
789 bool has_crash_protection() const { return _crash_protection != NULL; }
790 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
791
792 private:
793 int sleep() const;
794 };
795
796
797 class CompilerThread;
798
799 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
800
801 class JavaThread: public Thread {
802 friend class VMStructs;
803 friend class JVMCIVMStructs;
804 friend class WhiteBox;
805 private:
806 JavaThread* _next; // The next thread in the Threads list
807 oop _threadObj; // The Java level thread object
808
809 #ifdef ASSERT
810 private:
811 int _java_call_counter;
812
813 public:
814 int java_call_counter() { return _java_call_counter; }
815 void inc_java_call_counter() { _java_call_counter++; }
816 void dec_java_call_counter() {
817 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
818 _java_call_counter--;
819 }
820 private: // restore original namespace restriction
821 #endif // ifdef ASSERT
822
823 #ifndef PRODUCT
824 public:
825 enum {
826 jump_ring_buffer_size = 16
827 };
828 private: // restore original namespace restriction
829 #endif
830
831 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
832
833 ThreadFunction _entry_point;
834
835 JNIEnv _jni_environment;
836
837 // Deopt support
838 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
839
840 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
841 // transition out of native
842 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized
843 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
844 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
845 // Because deoptimization is lazy we must save jvmti requests to set locals
846 // in compiled frames until we deoptimize and we have an interpreter frame.
847 // This holds the pointer to array (yeah like there might be more than one) of
848 // description of compiled vframes that have locals that need to be updated.
849 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
850
851 // Handshake value for fixing 6243940. We need a place for the i2c
852 // adapter to store the callee Method*. This value is NEVER live
853 // across a gc point so it does NOT have to be gc'd
854 // The handshake is open ended since we can't be certain that it will
855 // be NULLed. This is because we rarely ever see the race and end up
856 // in handle_wrong_method which is the backend of the handshake. See
857 // code in i2c adapters and handle_wrong_method.
858
859 Method* _callee_target;
860
861 // Used to pass back results to the interpreter or generated code running Java code.
862 oop _vm_result; // oop result is GC-preserved
863 Metadata* _vm_result_2; // non-oop result
864
865 // See ReduceInitialCardMarks: this holds the precise space interval of
866 // the most recent slow path allocation for which compiled code has
867 // elided card-marks for performance along the fast-path.
868 MemRegion _deferred_card_mark;
869
870 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
871 // allocated during deoptimization
872 // and by JNI_MonitorEnter/Exit
873
874 // Async. requests support
875 enum AsyncRequests {
876 _no_async_condition = 0,
877 _async_exception,
878 _async_unsafe_access_error
879 };
880 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
881 oop _pending_async_exception;
882
883 // Safepoint support
884 public: // Expose _thread_state for SafeFetchInt()
885 volatile JavaThreadState _thread_state;
886 private:
887 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
888 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
889
890 // JavaThread termination support
891 enum TerminatedTypes {
892 _not_terminated = 0xDEAD - 2,
893 _thread_exiting, // JavaThread::exit() has been called for this thread
894 _thread_terminated, // JavaThread is removed from thread list
895 _vm_exited // JavaThread is still executing native code, but VM is terminated
896 // only VM_Exit can set _vm_exited
897 };
898
899 // In general a JavaThread's _terminated field transitions as follows:
900 //
901 // _not_terminated => _thread_exiting => _thread_terminated
902 //
903 // _vm_exited is a special value to cover the case of a JavaThread
904 // executing native code after the VM itself is terminated.
905 volatile TerminatedTypes _terminated;
906 // suspend/resume support
907 volatile bool _suspend_equivalent; // Suspend equivalent condition
908 jint _in_deopt_handler; // count of deoptimization
909 // handlers thread is in
910 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
911 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
912 // never locked) when throwing an exception. Used by interpreter only.
913
914 // JNI attach states:
915 enum JNIAttachStates {
916 _not_attaching_via_jni = 1, // thread is not attaching via JNI
917 _attaching_via_jni, // thread is attaching via JNI
918 _attached_via_jni // thread has attached via JNI
919 };
920
921 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
922 // A native thread that is attaching via JNI starts with a value
923 // of _attaching_via_jni and transitions to _attached_via_jni.
924 volatile JNIAttachStates _jni_attach_state;
925
926 public:
927 // State of the stack guard pages for this thread.
928 enum StackGuardState {
929 stack_guard_unused, // not needed
930 stack_guard_reserved_disabled,
931 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow
932 stack_guard_enabled // enabled
933 };
934
935 private:
936
937 #if INCLUDE_JVMCI
938 // The _pending_* fields below are used to communicate extra information
939 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
940
941 // Communicates the DeoptReason and DeoptAction of the uncommon trap
942 int _pending_deoptimization;
943
944 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
945 // before the monitor has been acquired.
946 bool _pending_monitorenter;
947
948 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
949 bool _pending_transfer_to_interpreter;
950
951 // Guard for re-entrant call to JVMCIRuntime::adjust_comp_level
952 bool _adjusting_comp_level;
953
954 // An object that JVMCI compiled code can use to further describe and
955 // uniquely identify the speculative optimization guarded by the uncommon trap
956 oop _pending_failed_speculation;
957
958 // These fields are mutually exclusive in terms of live ranges.
959 union {
960 // Communicates the pc at which the most recent implicit exception occurred
961 // from the signal handler to a deoptimization stub.
962 address _implicit_exception_pc;
963
964 // Communicates an alternative call target to an i2c stub from a JavaCall .
965 address _alternate_call_target;
966 } _jvmci;
967
968 // Support for high precision, thread sensitive counters in JVMCI compiled code.
969 jlong* _jvmci_counters;
970
971 public:
972 static jlong* _jvmci_old_thread_counters;
973 static void collect_counters(typeArrayOop array);
974 private:
975 #endif // INCLUDE_JVMCI
976
977 StackGuardState _stack_guard_state;
978
979 // Precompute the limit of the stack as used in stack overflow checks.
980 // We load it from here to simplify the stack overflow check in assembly.
981 address _stack_overflow_limit;
982 address _reserved_stack_activation;
983
984 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
985 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
986 // code)
987 volatile oop _exception_oop; // Exception thrown in compiled code
988 volatile address _exception_pc; // PC where exception happened
989 volatile address _exception_handler_pc; // PC for handler of exception
990 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
991
992 private:
993 // support for JNI critical regions
994 jint _jni_active_critical; // count of entries into JNI critical region
995
996 // Checked JNI: function name requires exception check
997 char* _pending_jni_exception_check_fn;
998
999 // For deadlock detection.
1000 int _depth_first_number;
1001
1002 // JVMTI PopFrame support
1003 // This is set to popframe_pending to signal that top Java frame should be popped immediately
1004 int _popframe_condition;
1005
1006 // If reallocation of scalar replaced objects fails, we throw OOM
1007 // and during exception propagation, pop the top
1008 // _frames_to_pop_failed_realloc frames, the ones that reference
1009 // failed reallocations.
1010 int _frames_to_pop_failed_realloc;
1011
1012 #ifndef PRODUCT
1013 int _jmp_ring_index;
1014 struct {
1015 // We use intptr_t instead of address so debugger doesn't try and display strings
1016 intptr_t _target;
1017 intptr_t _instruction;
1018 const char* _file;
1019 int _line;
1020 } _jmp_ring[jump_ring_buffer_size];
1021 #endif // PRODUCT
1022
1023 #if INCLUDE_ALL_GCS
1024 // Support for G1 barriers
1025
1026 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier.
1027 // Set of all such queues.
1028 static SATBMarkQueueSet _satb_mark_queue_set;
1029
1030 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
1031 // Set of all such queues.
1032 static DirtyCardQueueSet _dirty_card_queue_set;
1033
1034 void flush_barrier_queues();
1035
1036 bool _evacuation_in_progress;
1037 static bool _evacuation_in_progress_global;
1038
1039 #endif // INCLUDE_ALL_GCS
1040
1041 friend class VMThread;
1042 friend class ThreadWaitTransition;
1043 friend class VM_Exit;
1044
1045 void initialize(); // Initialized the instance variables
1046
1047 public:
1048 // Constructor
1049 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1050 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1051 ~JavaThread();
1052
1053 #ifdef ASSERT
1054 // verify this JavaThread hasn't be published in the Threads::list yet
1055 void verify_not_published();
1056 #endif
1057
1058 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1059 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1060 _jni_environment.functions = functionTable;
1061 }
1062 struct JNINativeInterface_* get_jni_functions() {
1063 return (struct JNINativeInterface_ *)_jni_environment.functions;
1064 }
1065
1066 // This function is called at thread creation to allow
1067 // platform specific thread variables to be initialized.
1068 void cache_global_variables();
1069
1070 // Executes Shutdown.shutdown()
1071 void invoke_shutdown_hooks();
1072
1073 // Cleanup on thread exit
1074 enum ExitType {
1075 normal_exit,
1076 jni_detach
1077 };
1078 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1079
1080 void cleanup_failed_attach_current_thread();
1081
1082 // Testers
1083 virtual bool is_Java_thread() const { return true; }
1084 virtual bool can_call_java() const { return true; }
1085
1086 // Thread chain operations
1087 JavaThread* next() const { return _next; }
1088 void set_next(JavaThread* p) { _next = p; }
1089
1090 // Thread oop. threadObj() can be NULL for initial JavaThread
1091 // (or for threads attached via JNI)
1092 oop threadObj() const { return _threadObj; }
1093 void set_threadObj(oop p) { _threadObj = p; }
1094
1095 ThreadPriority java_priority() const; // Read from threadObj()
1096
1097 // Prepare thread and add to priority queue. If a priority is
1098 // not specified, use the priority of the thread object. Threads_lock
1099 // must be held while this function is called.
1100 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1101 void prepare_ext();
1102
1103 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1104 address saved_exception_pc() { return _saved_exception_pc; }
1105
1106
1107 ThreadFunction entry_point() const { return _entry_point; }
1108
1109 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1110 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1111
1112 // Last frame anchor routines
1113
1114 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1115
1116 // last_Java_sp
1117 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1118 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1119
1120 // last_Java_pc
1121
1122 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1123
1124 // Safepoint support
1125 #if !(defined(PPC64) || defined(AARCH64))
1126 JavaThreadState thread_state() const { return _thread_state; }
1127 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1128 #else
1129 // Use membars when accessing volatile _thread_state. See
1130 // Threads::create_vm() for size checks.
1131 inline JavaThreadState thread_state() const;
1132 inline void set_thread_state(JavaThreadState s);
1133 #endif
1134 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1135 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1136 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1137
1138 // thread has called JavaThread::exit() or is terminated
1139 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1140 // thread is terminated (no longer on the threads list); we compare
1141 // against the two non-terminated values so that a freed JavaThread
1142 // will also be considered terminated.
1143 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1144 void set_terminated(TerminatedTypes t) { _terminated = t; }
1145 // special for Threads::remove() which is static:
1146 void set_terminated_value() { _terminated = _thread_terminated; }
1147 void block_if_vm_exited();
1148
1149 bool doing_unsafe_access() { return _doing_unsafe_access; }
1150 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1151
1152 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1153 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1154
1155 // Suspend/resume support for JavaThread
1156 private:
1157 inline void set_ext_suspended();
1158 inline void clear_ext_suspended();
1159
1160 public:
1161 void java_suspend();
1162 void java_resume();
1163 int java_suspend_self();
1164
1165 void check_and_wait_while_suspended() {
1166 assert(JavaThread::current() == this, "sanity check");
1167
1168 bool do_self_suspend;
1169 do {
1170 // were we externally suspended while we were waiting?
1171 do_self_suspend = handle_special_suspend_equivalent_condition();
1172 if (do_self_suspend) {
1173 // don't surprise the thread that suspended us by returning
1174 java_suspend_self();
1175 set_suspend_equivalent();
1176 }
1177 } while (do_self_suspend);
1178 }
1179 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1180 // Check for async exception in addition to safepoint and suspend request.
1181 static void check_special_condition_for_native_trans(JavaThread *thread);
1182
1183 // Same as check_special_condition_for_native_trans but finishes the
1184 // transition into thread_in_Java mode so that it can potentially
1185 // block.
1186 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1187
1188 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1189 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1190 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1191 // Warning: is_ext_suspend_completed() may temporarily drop the
1192 // SR_lock to allow the thread to reach a stable thread state if
1193 // it is currently in a transient thread state.
1194 return is_ext_suspend_completed(false /* !called_by_wait */,
1195 SuspendRetryDelay, bits);
1196 }
1197
1198 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1199 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1200 // passed as the count and delay parameters. Experiments with specific
1201 // calls to wait_for_ext_suspend_completion() can be done by passing
1202 // other values in the code. Experiments with all calls can be done
1203 // via the appropriate -XX options.
1204 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1205
1206 inline void set_external_suspend();
1207 inline void clear_external_suspend();
1208
1209 inline void set_deopt_suspend();
1210 inline void clear_deopt_suspend();
1211 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1212
1213 bool is_external_suspend() const {
1214 return (_suspend_flags & _external_suspend) != 0;
1215 }
1216 // Whenever a thread transitions from native to vm/java it must suspend
1217 // if external|deopt suspend is present.
1218 bool is_suspend_after_native() const {
1219 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0;
1220 }
1221
1222 // external suspend request is completed
1223 bool is_ext_suspended() const {
1224 return (_suspend_flags & _ext_suspended) != 0;
1225 }
1226
1227 bool is_external_suspend_with_lock() const {
1228 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1229 return is_external_suspend();
1230 }
1231
1232 // Special method to handle a pending external suspend request
1233 // when a suspend equivalent condition lifts.
1234 bool handle_special_suspend_equivalent_condition() {
1235 assert(is_suspend_equivalent(),
1236 "should only be called in a suspend equivalence condition");
1237 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1238 bool ret = is_external_suspend();
1239 if (!ret) {
1240 // not about to self-suspend so clear suspend equivalence
1241 clear_suspend_equivalent();
1242 }
1243 // implied else:
1244 // We have a pending external suspend request so we leave the
1245 // suspend_equivalent flag set until java_suspend_self() sets
1246 // the ext_suspended flag and clears the suspend_equivalent
1247 // flag. This insures that wait_for_ext_suspend_completion()
1248 // will return consistent values.
1249 return ret;
1250 }
1251
1252 // utility methods to see if we are doing some kind of suspension
1253 bool is_being_ext_suspended() const {
1254 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1255 return is_ext_suspended() || is_external_suspend();
1256 }
1257
1258 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1259
1260 void set_suspend_equivalent() { _suspend_equivalent = true; }
1261 void clear_suspend_equivalent() { _suspend_equivalent = false; }
1262
1263 // Thread.stop support
1264 void send_thread_stop(oop throwable);
1265 AsyncRequests clear_special_runtime_exit_condition() {
1266 AsyncRequests x = _special_runtime_exit_condition;
1267 _special_runtime_exit_condition = _no_async_condition;
1268 return x;
1269 }
1270
1271 // Are any async conditions present?
1272 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1273
1274 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1275
1276 // these next two are also used for self-suspension and async exception support
1277 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1278
1279 // Return true if JavaThread has an asynchronous condition or
1280 // if external suspension is requested.
1281 bool has_special_runtime_exit_condition() {
1282 // We call is_external_suspend() last since external suspend should
1283 // be less common. Because we don't use is_external_suspend_with_lock
1284 // it is possible that we won't see an asynchronous external suspend
1285 // request that has just gotten started, i.e., SR_lock grabbed but
1286 // _external_suspend field change either not made yet or not visible
1287 // yet. However, this is okay because the request is asynchronous and
1288 // we will see the new flag value the next time through. It's also
1289 // possible that the external suspend request is dropped after
1290 // we have checked is_external_suspend(), we will recheck its value
1291 // under SR_lock in java_suspend_self().
1292 return (_special_runtime_exit_condition != _no_async_condition) ||
1293 is_external_suspend() || is_deopt_suspend();
1294 }
1295
1296 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1297
1298 inline void set_pending_async_exception(oop e);
1299
1300 // Fast-locking support
1301 bool is_lock_owned(address adr) const;
1302
1303 // Accessors for vframe array top
1304 // The linked list of vframe arrays are sorted on sp. This means when we
1305 // unpack the head must contain the vframe array to unpack.
1306 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1307 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1308
1309 // Side structure for deferring update of java frame locals until deopt occurs
1310 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1311 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1312
1313 // These only really exist to make debugging deopt problems simpler
1314
1315 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1316 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1317
1318 // The special resourceMark used during deoptimization
1319
1320 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1321 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1322
1323 intptr_t* must_deopt_id() { return _must_deopt_id; }
1324 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1325 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1326
1327 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; }
1328 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; }
1329
1330 Method* callee_target() const { return _callee_target; }
1331 void set_callee_target (Method* x) { _callee_target = x; }
1332
1333 // Oop results of vm runtime calls
1334 oop vm_result() const { return _vm_result; }
1335 void set_vm_result (oop x) { _vm_result = x; }
1336
1337 Metadata* vm_result_2() const { return _vm_result_2; }
1338 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1339
1340 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1341 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1342
1343 #if INCLUDE_JVMCI
1344 int pending_deoptimization() const { return _pending_deoptimization; }
1345 oop pending_failed_speculation() const { return _pending_failed_speculation; }
1346 bool adjusting_comp_level() const { return _adjusting_comp_level; }
1347 void set_adjusting_comp_level(bool b) { _adjusting_comp_level = b; }
1348 bool has_pending_monitorenter() const { return _pending_monitorenter; }
1349 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
1350 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
1351 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; }
1352 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
1353 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
1354 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
1355 #endif // INCLUDE_JVMCI
1356
1357 // Exception handling for compiled methods
1358 oop exception_oop() const { return _exception_oop; }
1359 address exception_pc() const { return _exception_pc; }
1360 address exception_handler_pc() const { return _exception_handler_pc; }
1361 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1362
1363 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1364 void set_exception_pc(address a) { _exception_pc = a; }
1365 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1366 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1367
1368 void clear_exception_oop_and_pc() {
1369 set_exception_oop(NULL);
1370 set_exception_pc(NULL);
1371 }
1372
1373 // Stack overflow support
1374 //
1375 // (small addresses)
1376 //
1377 // -- <-- stack_end() ---
1378 // | |
1379 // | red pages |
1380 // | |
1381 // -- <-- stack_red_zone_base() |
1382 // | |
1383 // | guard
1384 // | yellow pages zone
1385 // | |
1386 // | |
1387 // -- <-- stack_yellow_zone_base() |
1388 // | |
1389 // | |
1390 // | reserved pages |
1391 // | |
1392 // -- <-- stack_reserved_zone_base() --- ---
1393 // /|\ shadow <-- stack_overflow_limit() (somewhere in here)
1394 // | zone
1395 // \|/ size
1396 // some untouched memory ---
1397 //
1398 //
1399 // --
1400 // |
1401 // | shadow zone
1402 // |
1403 // --
1404 // x frame n
1405 // --
1406 // x frame n-1
1407 // x
1408 // --
1409 // ...
1410 //
1411 // --
1412 // x frame 0
1413 // -- <-- stack_base()
1414 //
1415 // (large addresses)
1416 //
1417
1418 private:
1419 // These values are derived from flags StackRedPages, StackYellowPages,
1420 // StackReservedPages and StackShadowPages. The zone size is determined
1421 // ergonomically if page_size > 4K.
1422 static size_t _stack_red_zone_size;
1423 static size_t _stack_yellow_zone_size;
1424 static size_t _stack_reserved_zone_size;
1425 static size_t _stack_shadow_zone_size;
1426 public:
1427 inline size_t stack_available(address cur_sp);
1428
1429 static size_t stack_red_zone_size() {
1430 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized.");
1431 return _stack_red_zone_size;
1432 }
1433 static void set_stack_red_zone_size(size_t s) {
1434 assert(is_size_aligned(s, os::vm_page_size()),
1435 "We can not protect if the red zone size is not page aligned.");
1436 assert(_stack_red_zone_size == 0, "This should be called only once.");
1437 _stack_red_zone_size = s;
1438 }
1439 address stack_red_zone_base() {
1440 return (address)(stack_end() + stack_red_zone_size());
1441 }
1442 bool in_stack_red_zone(address a) {
1443 return a <= stack_red_zone_base() && a >= stack_end();
1444 }
1445
1446 static size_t stack_yellow_zone_size() {
1447 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized.");
1448 return _stack_yellow_zone_size;
1449 }
1450 static void set_stack_yellow_zone_size(size_t s) {
1451 assert(is_size_aligned(s, os::vm_page_size()),
1452 "We can not protect if the yellow zone size is not page aligned.");
1453 assert(_stack_yellow_zone_size == 0, "This should be called only once.");
1454 _stack_yellow_zone_size = s;
1455 }
1456
1457 static size_t stack_reserved_zone_size() {
1458 // _stack_reserved_zone_size may be 0. This indicates the feature is off.
1459 return _stack_reserved_zone_size;
1460 }
1461 static void set_stack_reserved_zone_size(size_t s) {
1462 assert(is_size_aligned(s, os::vm_page_size()),
1463 "We can not protect if the reserved zone size is not page aligned.");
1464 assert(_stack_reserved_zone_size == 0, "This should be called only once.");
1465 _stack_reserved_zone_size = s;
1466 }
1467 address stack_reserved_zone_base() {
1468 return (address)(stack_end() +
1469 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size()));
1470 }
1471 bool in_stack_reserved_zone(address a) {
1472 return (a <= stack_reserved_zone_base()) &&
1473 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size()));
1474 }
1475
1476 static size_t stack_yellow_reserved_zone_size() {
1477 return _stack_yellow_zone_size + _stack_reserved_zone_size;
1478 }
1479 bool in_stack_yellow_reserved_zone(address a) {
1480 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base());
1481 }
1482
1483 // Size of red + yellow + reserved zones.
1484 static size_t stack_guard_zone_size() {
1485 return stack_red_zone_size() + stack_yellow_reserved_zone_size();
1486 }
1487
1488 static size_t stack_shadow_zone_size() {
1489 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized.");
1490 return _stack_shadow_zone_size;
1491 }
1492 static void set_stack_shadow_zone_size(size_t s) {
1493 // The shadow area is not allocated or protected, so
1494 // it needs not be page aligned.
1495 // But the stack bang currently assumes that it is a
1496 // multiple of page size. This guarantees that the bang
1497 // loop touches all pages in the shadow zone.
1498 // This can be guaranteed differently, as well. E.g., if
1499 // the page size is a multiple of 4K, banging in 4K steps
1500 // suffices to touch all pages. (Some pages are banged
1501 // several times, though.)
1502 assert(is_size_aligned(s, os::vm_page_size()),
1503 "Stack bang assumes multiple of page size.");
1504 assert(_stack_shadow_zone_size == 0, "This should be called only once.");
1505 _stack_shadow_zone_size = s;
1506 }
1507
1508 void create_stack_guard_pages();
1509 void remove_stack_guard_pages();
1510
1511 void enable_stack_reserved_zone();
1512 void disable_stack_reserved_zone();
1513 void enable_stack_yellow_reserved_zone();
1514 void disable_stack_yellow_reserved_zone();
1515 void enable_stack_red_zone();
1516 void disable_stack_red_zone();
1517
1518 inline bool stack_guard_zone_unused();
1519 inline bool stack_yellow_reserved_zone_disabled();
1520 inline bool stack_reserved_zone_disabled();
1521 inline bool stack_guards_enabled();
1522
1523 address reserved_stack_activation() const { return _reserved_stack_activation; }
1524 void set_reserved_stack_activation(address addr) {
1525 assert(_reserved_stack_activation == stack_base()
1526 || _reserved_stack_activation == NULL
1527 || addr == stack_base(), "Must not be set twice");
1528 _reserved_stack_activation = addr;
1529 }
1530
1531 // Attempt to reguard the stack after a stack overflow may have occurred.
1532 // Returns true if (a) guard pages are not needed on this thread, (b) the
1533 // pages are already guarded, or (c) the pages were successfully reguarded.
1534 // Returns false if there is not enough stack space to reguard the pages, in
1535 // which case the caller should unwind a frame and try again. The argument
1536 // should be the caller's (approximate) sp.
1537 bool reguard_stack(address cur_sp);
1538 // Similar to above but see if current stackpoint is out of the guard area
1539 // and reguard if possible.
1540 bool reguard_stack(void);
1541
1542 address stack_overflow_limit() { return _stack_overflow_limit; }
1543 void set_stack_overflow_limit() {
1544 _stack_overflow_limit =
1545 stack_end() + MAX2(JavaThread::stack_guard_zone_size(), JavaThread::stack_shadow_zone_size());
1546 }
1547
1548 // Misc. accessors/mutators
1549 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1550 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1551 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1552
1553 #ifndef PRODUCT
1554 void record_jump(address target, address instr, const char* file, int line);
1555 #endif // PRODUCT
1556
1557 // For assembly stub generation
1558 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1559 #ifndef PRODUCT
1560 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); }
1561 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); }
1562 #endif // PRODUCT
1563 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1564 static ByteSize pending_jni_exception_check_fn_offset() {
1565 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn);
1566 }
1567 static ByteSize last_Java_sp_offset() {
1568 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1569 }
1570 static ByteSize last_Java_pc_offset() {
1571 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1572 }
1573 static ByteSize frame_anchor_offset() {
1574 return byte_offset_of(JavaThread, _anchor);
1575 }
1576 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1577 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1578 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1579 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1580 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1581 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1582 #if INCLUDE_JVMCI
1583 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
1584 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
1585 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); }
1586 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
1587 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
1588 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
1589 #endif // INCLUDE_JVMCI
1590 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1591 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1592 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1593 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1594 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1595 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); }
1596 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); }
1597 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1598
1599 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1600 static ByteSize should_post_on_exceptions_flag_offset() {
1601 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1602 }
1603
1604 #if INCLUDE_ALL_GCS
1605 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1606 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1607
1608 static ByteSize evacuation_in_progress_offset() { return byte_offset_of(JavaThread, _evacuation_in_progress); }
1609
1610 #endif // INCLUDE_ALL_GCS
1611
1612 // Returns the jni environment for this thread
1613 JNIEnv* jni_environment() { return &_jni_environment; }
1614
1615 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1616 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1617 // Only return NULL if thread is off the thread list; starting to
1618 // exit should not return NULL.
1619 if (thread_from_jni_env->is_terminated()) {
1620 thread_from_jni_env->block_if_vm_exited();
1621 return NULL;
1622 } else {
1623 return thread_from_jni_env;
1624 }
1625 }
1626
1627 // JNI critical regions. These can nest.
1628 bool in_critical() { return _jni_active_critical > 0; }
1629 bool in_last_critical() { return _jni_active_critical == 1; }
1630 void enter_critical() {
1631 assert(Thread::current() == this ||
1632 (Thread::current()->is_VM_thread() &&
1633 SafepointSynchronize::is_synchronizing()),
1634 "this must be current thread or synchronizing");
1635 _jni_active_critical++;
1636 }
1637 void exit_critical() {
1638 assert(Thread::current() == this, "this must be current thread");
1639 _jni_active_critical--;
1640 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1641 }
1642
1643 // Checked JNI: is the programmer required to check for exceptions, if so specify
1644 // which function name. Returning to a Java frame should implicitly clear the
1645 // pending check, this is done for Native->Java transitions (i.e. user JNI code).
1646 // VM->Java transistions are not cleared, it is expected that JNI code enclosed
1647 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal).
1648 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1649 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1650 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1651 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1652
1653 // For deadlock detection
1654 int depth_first_number() { return _depth_first_number; }
1655 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1656
1657 private:
1658 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1659
1660 public:
1661 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1662 void add_monitor_chunk(MonitorChunk* chunk);
1663 void remove_monitor_chunk(MonitorChunk* chunk);
1664 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1665 void inc_in_deopt_handler() { _in_deopt_handler++; }
1666 void dec_in_deopt_handler() {
1667 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1668 if (_in_deopt_handler > 0) { // robustness
1669 _in_deopt_handler--;
1670 }
1671 }
1672
1673 private:
1674 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1675
1676 public:
1677
1678 // Frame iteration; calls the function f for all frames on the stack
1679 void frames_do(void f(frame*, const RegisterMap*));
1680
1681 // Memory operations
1682 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1683
1684 // Sweeper operations
1685 virtual void nmethods_do(CodeBlobClosure* cf);
1686
1687 // RedefineClasses Support
1688 void metadata_do(void f(Metadata*));
1689
1690 // Misc. operations
1691 char* name() const { return (char*)get_thread_name(); }
1692 void print_on(outputStream* st) const;
1693 void print_value();
1694 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1695 void print_thread_state() const PRODUCT_RETURN;
1696 void print_on_error(outputStream* st, char* buf, int buflen) const;
1697 void print_name_on_error(outputStream* st, char* buf, int buflen) const;
1698 void verify();
1699 const char* get_thread_name() const;
1700 private:
1701 // factor out low-level mechanics for use in both normal and error cases
1702 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1703 public:
1704 const char* get_threadgroup_name() const;
1705 const char* get_parent_name() const;
1706
1707 // Accessing frames
1708 frame last_frame() {
1709 _anchor.make_walkable(this);
1710 return pd_last_frame();
1711 }
1712 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1713
1714 // Returns method at 'depth' java or native frames down the stack
1715 // Used for security checks
1716 Klass* security_get_caller_class(int depth);
1717
1718 // Print stack trace in external format
1719 void print_stack_on(outputStream* st);
1720 void print_stack() { print_stack_on(tty); }
1721
1722 // Print stack traces in various internal formats
1723 void trace_stack() PRODUCT_RETURN;
1724 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1725 void trace_frames() PRODUCT_RETURN;
1726 void trace_oops() PRODUCT_RETURN;
1727
1728 // Print an annotated view of the stack frames
1729 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1730 void validate_frame_layout() {
1731 print_frame_layout(0, true);
1732 }
1733
1734 // Returns the number of stack frames on the stack
1735 int depth() const;
1736
1737 // Function for testing deoptimization
1738 void deoptimize();
1739 void make_zombies();
1740
1741 void deoptimized_wrt_marked_nmethods();
1742
1743 // Profiling operation (see fprofile.cpp)
1744 public:
1745 bool profile_last_Java_frame(frame* fr);
1746
1747 private:
1748 ThreadProfiler* _thread_profiler;
1749 private:
1750 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1751 friend class FlatProfilerTask; // uses get_thread_profiler.
1752 friend class ThreadProfilerMark; // uses get_thread_profiler.
1753 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1754 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1755 ThreadProfiler* result = _thread_profiler;
1756 _thread_profiler = tp;
1757 return result;
1758 }
1759
1760 public:
1761 // Returns the running thread as a JavaThread
1762 static inline JavaThread* current();
1763
1764 // Returns the active Java thread. Do not use this if you know you are calling
1765 // from a JavaThread, as it's slower than JavaThread::current. If called from
1766 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1767 // operation. You may not want that either.
1768 static JavaThread* active();
1769
1770 inline CompilerThread* as_CompilerThread();
1771
1772 public:
1773 virtual void run();
1774 void thread_main_inner();
1775
1776 private:
1777 // PRIVILEGED STACK
1778 PrivilegedElement* _privileged_stack_top;
1779 GrowableArray<oop>* _array_for_gc;
1780 public:
1781
1782 // Returns the privileged_stack information.
1783 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1784 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1785 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1786
1787 public:
1788 // Thread local information maintained by JVMTI.
1789 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1790 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1791 // getter is used to get this JavaThread's JvmtiThreadState if it has
1792 // one which means NULL can be returned. JvmtiThreadState::state_for()
1793 // is used to get the specified JavaThread's JvmtiThreadState if it has
1794 // one or it allocates a new JvmtiThreadState for the JavaThread and
1795 // returns it. JvmtiThreadState::state_for() will return NULL only if
1796 // the specified JavaThread is exiting.
1797 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1798 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1799 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1800 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1801
1802 // JVMTI PopFrame support
1803 // Setting and clearing popframe_condition
1804 // All of these enumerated values are bits. popframe_pending
1805 // indicates that a PopFrame() has been requested and not yet been
1806 // completed. popframe_processing indicates that that PopFrame() is in
1807 // the process of being completed. popframe_force_deopt_reexecution_bit
1808 // indicates that special handling is required when returning to a
1809 // deoptimized caller.
1810 enum PopCondition {
1811 popframe_inactive = 0x00,
1812 popframe_pending_bit = 0x01,
1813 popframe_processing_bit = 0x02,
1814 popframe_force_deopt_reexecution_bit = 0x04
1815 };
1816 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1817 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1818 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1819 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1820 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1821 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1822 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1823 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1824 #ifdef CC_INTERP
1825 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1826 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1827 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1828 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1829 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1830 #endif
1831
1832 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1833 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1834 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1835
1836 private:
1837 // Saved incoming arguments to popped frame.
1838 // Used only when popped interpreted frame returns to deoptimized frame.
1839 void* _popframe_preserved_args;
1840 int _popframe_preserved_args_size;
1841
1842 public:
1843 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1844 void* popframe_preserved_args();
1845 ByteSize popframe_preserved_args_size();
1846 WordSize popframe_preserved_args_size_in_words();
1847 void popframe_free_preserved_args();
1848
1849
1850 private:
1851 JvmtiThreadState *_jvmti_thread_state;
1852 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1853
1854 // Used by the interpreter in fullspeed mode for frame pop, method
1855 // entry, method exit and single stepping support. This field is
1856 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1857 // It can be set to zero asynchronously (i.e., without a VM operation
1858 // or a lock) so we have to be very careful.
1859 int _interp_only_mode;
1860
1861 public:
1862 // used by the interpreter for fullspeed debugging support (see above)
1863 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1864 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1865 int get_interp_only_mode() { return _interp_only_mode; }
1866 void increment_interp_only_mode() { ++_interp_only_mode; }
1867 void decrement_interp_only_mode() { --_interp_only_mode; }
1868
1869 // support for cached flag that indicates whether exceptions need to be posted for this thread
1870 // if this is false, we can avoid deoptimizing when events are thrown
1871 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1872 private:
1873 int _should_post_on_exceptions_flag;
1874
1875 public:
1876 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1877 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1878
1879 private:
1880 ThreadStatistics *_thread_stat;
1881
1882 public:
1883 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1884
1885 // Return a blocker object for which this thread is blocked parking.
1886 oop current_park_blocker();
1887
1888 private:
1889 static size_t _stack_size_at_create;
1890
1891 public:
1892 static inline size_t stack_size_at_create(void) {
1893 return _stack_size_at_create;
1894 }
1895 static inline void set_stack_size_at_create(size_t value) {
1896 _stack_size_at_create = value;
1897 }
1898
1899 #if INCLUDE_ALL_GCS
1900 // SATB marking queue support
1901 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; }
1902 static SATBMarkQueueSet& satb_mark_queue_set() {
1903 return _satb_mark_queue_set;
1904 }
1905
1906 // Dirty card queue support
1907 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1908 static DirtyCardQueueSet& dirty_card_queue_set() {
1909 return _dirty_card_queue_set;
1910 }
1911
1912 bool evacuation_in_progress() const;
1913
1914 void set_evacuation_in_progress(bool in_prog);
1915
1916 static void set_evacuation_in_progress_all_threads(bool in_prog);
1917 #endif // INCLUDE_ALL_GCS
1918
1919 // This method initializes the SATB and dirty card queues before a
1920 // JavaThread is added to the Java thread list. Right now, we don't
1921 // have to do anything to the dirty card queue (it should have been
1922 // activated when the thread was created), but we have to activate
1923 // the SATB queue if the thread is created while a marking cycle is
1924 // in progress. The activation / de-activation of the SATB queues at
1925 // the beginning / end of a marking cycle is done during safepoints
1926 // so we have to make sure this method is called outside one to be
1927 // able to safely read the active field of the SATB queue set. Right
1928 // now, it is called just before the thread is added to the Java
1929 // thread list in the Threads::add() method. That method is holding
1930 // the Threads_lock which ensures we are outside a safepoint. We
1931 // cannot do the obvious and set the active field of the SATB queue
1932 // when the thread is created given that, in some cases, safepoints
1933 // might happen between the JavaThread constructor being called and the
1934 // thread being added to the Java thread list (an example of this is
1935 // when the structure for the DestroyJavaVM thread is created).
1936 #if INCLUDE_ALL_GCS
1937 void initialize_queues();
1938 #else // INCLUDE_ALL_GCS
1939 void initialize_queues() { }
1940 #endif // INCLUDE_ALL_GCS
1941
1942 // Machine dependent stuff
1943 #include OS_CPU_HEADER(thread)
1944
1945 public:
1946 void set_blocked_on_compilation(bool value) {
1947 _blocked_on_compilation = value;
1948 }
1949
1950 bool blocked_on_compilation() {
1951 return _blocked_on_compilation;
1952 }
1953 protected:
1954 bool _blocked_on_compilation;
1955
1956
1957 // JSR166 per-thread parker
1958 private:
1959 Parker* _parker;
1960 public:
1961 Parker* parker() { return _parker; }
1962
1963 // Biased locking support
1964 private:
1965 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1966 public:
1967 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1968 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1969
1970 // clearing/querying jni attach status
1971 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1972 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1973 inline void set_done_attaching_via_jni();
1974 };
1975
1976 // Inline implementation of JavaThread::current
1977 inline JavaThread* JavaThread::current() {
1978 Thread* thread = Thread::current();
1979 assert(thread->is_Java_thread(), "just checking");
1980 return (JavaThread*)thread;
1981 }
1982
1983 inline CompilerThread* JavaThread::as_CompilerThread() {
1984 assert(is_Compiler_thread(), "just checking");
1985 return (CompilerThread*)this;
1986 }
1987
1988 // Dedicated thread to sweep the code cache
1989 class CodeCacheSweeperThread : public JavaThread {
1990 CompiledMethod* _scanned_compiled_method; // nmethod being scanned by the sweeper
1991 public:
1992 CodeCacheSweeperThread();
1993 // Track the nmethod currently being scanned by the sweeper
1994 void set_scanned_compiled_method(CompiledMethod* cm) {
1995 assert(_scanned_compiled_method == NULL || cm == NULL, "should reset to NULL before writing a new value");
1996 _scanned_compiled_method = cm;
1997 }
1998
1999 // Hide sweeper thread from external view.
2000 bool is_hidden_from_external_view() const { return true; }
2001
2002 bool is_Code_cache_sweeper_thread() const { return true; }
2003
2004 // Prevent GC from unloading _scanned_compiled_method
2005 void oops_do(OopClosure* f, CodeBlobClosure* cf);
2006 void nmethods_do(CodeBlobClosure* cf);
2007 };
2008
2009 // A thread used for Compilation.
2010 class CompilerThread : public JavaThread {
2011 friend class VMStructs;
2012 private:
2013 CompilerCounters* _counters;
2014
2015 ciEnv* _env;
2016 CompileLog* _log;
2017 CompileTask* _task;
2018 CompileQueue* _queue;
2019 BufferBlob* _buffer_blob;
2020
2021 AbstractCompiler* _compiler;
2022
2023 public:
2024
2025 static CompilerThread* current();
2026
2027 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
2028
2029 bool is_Compiler_thread() const { return true; }
2030
2031 virtual bool can_call_java() const;
2032
2033 // Hide native compiler threads from external view.
2034 bool is_hidden_from_external_view() const { return !can_call_java(); }
2035
2036 void set_compiler(AbstractCompiler* c) { _compiler = c; }
2037 AbstractCompiler* compiler() const { return _compiler; }
2038
2039 CompileQueue* queue() const { return _queue; }
2040 CompilerCounters* counters() const { return _counters; }
2041
2042 // Get/set the thread's compilation environment.
2043 ciEnv* env() { return _env; }
2044 void set_env(ciEnv* env) { _env = env; }
2045
2046 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
2047 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }
2048
2049 // Get/set the thread's logging information
2050 CompileLog* log() { return _log; }
2051 void init_log(CompileLog* log) {
2052 // Set once, for good.
2053 assert(_log == NULL, "set only once");
2054 _log = log;
2055 }
2056
2057 #ifndef PRODUCT
2058 private:
2059 IdealGraphPrinter *_ideal_graph_printer;
2060 public:
2061 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
2062 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
2063 #endif
2064
2065 // Get/set the thread's current task
2066 CompileTask* task() { return _task; }
2067 void set_task(CompileTask* task) { _task = task; }
2068 };
2069
2070 inline CompilerThread* CompilerThread::current() {
2071 return JavaThread::current()->as_CompilerThread();
2072 }
2073
2074 // The active thread queue. It also keeps track of the current used
2075 // thread priorities.
2076 class Threads: AllStatic {
2077 friend class VMStructs;
2078 private:
2079 static JavaThread* _thread_list;
2080 static int _number_of_threads;
2081 static int _number_of_non_daemon_threads;
2082 static int _return_code;
2083 static int _thread_claim_parity;
2084 #ifdef ASSERT
2085 static bool _vm_complete;
2086 #endif
2087
2088 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
2089 static void initialize_jsr292_core_classes(TRAPS);
2090 public:
2091 // Thread management
2092 // force_daemon is a concession to JNI, where we may need to add a
2093 // thread to the thread list before allocating its thread object
2094 static void add(JavaThread* p, bool force_daemon = false);
2095 static void remove(JavaThread* p);
2096 static bool includes(JavaThread* p);
2097 static JavaThread* first() { return _thread_list; }
2098 static void threads_do(ThreadClosure* tc);
2099
2100 // Initializes the vm and creates the vm thread
2101 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
2102 static void convert_vm_init_libraries_to_agents();
2103 static void create_vm_init_libraries();
2104 static void create_vm_init_agents();
2105 static void shutdown_vm_agents();
2106 static bool destroy_vm();
2107 // Supported VM versions via JNI
2108 // Includes JNI_VERSION_1_1
2109 static jboolean is_supported_jni_version_including_1_1(jint version);
2110 // Does not include JNI_VERSION_1_1
2111 static jboolean is_supported_jni_version(jint version);
2112
2113 // The "thread claim parity" provides a way for threads to be claimed
2114 // by parallel worker tasks.
2115 //
2116 // Each thread contains a a "parity" field. A task will claim the
2117 // thread only if its parity field is the same as the global parity,
2118 // which is updated by calling change_thread_claim_parity().
2119 //
2120 // For this to work change_thread_claim_parity() needs to be called
2121 // exactly once in sequential code before starting parallel tasks
2122 // that should claim threads.
2123 //
2124 // New threads get their parity set to 0 and change_thread_claim_parity()
2125 // never set the global parity to 0.
2126 static int thread_claim_parity() { return _thread_claim_parity; }
2127 static void change_thread_claim_parity();
2128 static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
2129
2130 // Apply "f->do_oop" to all root oops in all threads.
2131 // This version may only be called by sequential code.
2132 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
2133 // This version may be called by sequential or parallel code.
2134 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf);
2135 // This creates a list of GCTasks, one per thread.
2136 static void create_thread_roots_tasks(GCTaskQueue* q);
2137 // This creates a list of GCTasks, one per thread, for marking objects.
2138 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
2139
2140 // Apply "f->do_oop" to roots in all threads that
2141 // are part of compiled frames
2142 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
2143
2144 static void convert_hcode_pointers();
2145 static void restore_hcode_pointers();
2146
2147 // Sweeper
2148 static void nmethods_do(CodeBlobClosure* cf);
2149
2150 // RedefineClasses support
2151 static void metadata_do(void f(Metadata*));
2152 static void metadata_handles_do(void f(Metadata*));
2153
2154 #ifdef ASSERT
2155 static bool is_vm_complete() { return _vm_complete; }
2156 #endif
2157
2158 // Verification
2159 static void verify();
2160 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
2161 static void print(bool print_stacks, bool internal_format) {
2162 // this function is only used by debug.cpp
2163 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
2164 }
2165 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2166 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf,
2167 int buflen, bool* found_current);
2168 static void print_threads_compiling(outputStream* st, char* buf, int buflen);
2169
2170 // Get Java threads that are waiting to enter a monitor. If doLock
2171 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2172 // VM needs to be at a safepoint.
2173 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2174 address monitor, bool doLock);
2175
2176 // Get owning Java thread from the monitor's owner field. If doLock
2177 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2178 // VM needs to be at a safepoint.
2179 static JavaThread *owning_thread_from_monitor_owner(address owner,
2180 bool doLock);
2181
2182 // Number of threads on the active threads list
2183 static int number_of_threads() { return _number_of_threads; }
2184 // Number of non-daemon threads on the active threads list
2185 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2186
2187 // Deoptimizes all frames tied to marked nmethods
2188 static void deoptimized_wrt_marked_nmethods();
2189
2190 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2191
2192 };
2193
2194
2195 // Thread iterator
2196 class ThreadClosure: public StackObj {
2197 public:
2198 virtual void do_thread(Thread* thread) = 0;
2199 };
2200
2201 class SignalHandlerMark: public StackObj {
2202 private:
2203 Thread* _thread;
2204 public:
2205 SignalHandlerMark(Thread* t) {
2206 _thread = t;
2207 if (_thread) _thread->enter_signal_handler();
2208 }
2209 ~SignalHandlerMark() {
2210 if (_thread) _thread->leave_signal_handler();
2211 _thread = NULL;
2212 }
2213 };
2214
2215
2216 #endif // SHARE_VM_RUNTIME_THREAD_HPP