Thu, 03 Apr 2014 17:49:31 +0400
8016302: Change type of the number of GC workers to unsigned int (2)
Reviewed-by: tschatzl, jwilhelm
1 /*
2 * Copyright (c) 1997, 2013, 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 */
25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 #define SHARE_VM_RUNTIME_THREAD_HPP
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/unhandledOops.hpp"
44 #include "utilities/macros.hpp"
46 #if INCLUDE_NMT
47 #include "services/memRecorder.hpp"
48 #endif // INCLUDE_NMT
50 #include "trace/traceBackend.hpp"
51 #include "trace/traceMacros.hpp"
52 #include "utilities/exceptions.hpp"
53 #include "utilities/top.hpp"
54 #if INCLUDE_ALL_GCS
55 #include "gc_implementation/g1/dirtyCardQueue.hpp"
56 #include "gc_implementation/g1/satbQueue.hpp"
57 #endif // INCLUDE_ALL_GCS
58 #ifdef ZERO
59 #ifdef TARGET_ARCH_zero
60 # include "stack_zero.hpp"
61 #endif
62 #endif
64 class ThreadSafepointState;
65 class ThreadProfiler;
67 class JvmtiThreadState;
68 class JvmtiGetLoadedClassesClosure;
69 class ThreadStatistics;
70 class ConcurrentLocksDump;
71 class ParkEvent;
72 class Parker;
74 class ciEnv;
75 class CompileThread;
76 class CompileLog;
77 class CompileTask;
78 class CompileQueue;
79 class CompilerCounters;
80 class vframeArray;
82 class DeoptResourceMark;
83 class jvmtiDeferredLocalVariableSet;
85 class GCTaskQueue;
86 class ThreadClosure;
87 class IdealGraphPrinter;
89 DEBUG_ONLY(class ResourceMark;)
91 class WorkerThread;
93 // Class hierarchy
94 // - Thread
95 // - NamedThread
96 // - VMThread
97 // - ConcurrentGCThread
98 // - WorkerThread
99 // - GangWorker
100 // - GCTaskThread
101 // - JavaThread
102 // - WatcherThread
104 class Thread: public ThreadShadow {
105 friend class VMStructs;
106 private:
107 // Exception handling
108 // (Note: _pending_exception and friends are in ThreadShadow)
109 //oop _pending_exception; // pending exception for current thread
110 // const char* _exception_file; // file information for exception (debugging only)
111 // int _exception_line; // line information for exception (debugging only)
112 protected:
113 // Support for forcing alignment of thread objects for biased locking
114 void* _real_malloc_address;
115 public:
116 void* operator new(size_t size) throw() { return allocate(size, true); }
117 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
118 return allocate(size, false); }
119 void operator delete(void* p);
121 protected:
122 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
123 private:
125 // ***************************************************************
126 // Suspend and resume support
127 // ***************************************************************
128 //
129 // VM suspend/resume no longer exists - it was once used for various
130 // things including safepoints but was deprecated and finally removed
131 // in Java 7. Because VM suspension was considered "internal" Java-level
132 // suspension was considered "external", and this legacy naming scheme
133 // remains.
134 //
135 // External suspend/resume requests come from JVM_SuspendThread,
136 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
137 // ResumeThread. External
138 // suspend requests cause _external_suspend to be set and external
139 // resume requests cause _external_suspend to be cleared.
140 // External suspend requests do not nest on top of other external
141 // suspend requests. The higher level APIs reject suspend requests
142 // for already suspended threads.
143 //
144 // The external_suspend
145 // flag is checked by has_special_runtime_exit_condition() and java thread
146 // will self-suspend when handle_special_runtime_exit_condition() is
147 // called. Most uses of the _thread_blocked state in JavaThreads are
148 // considered the same as being externally suspended; if the blocking
149 // condition lifts, the JavaThread will self-suspend. Other places
150 // where VM checks for external_suspend include:
151 // + mutex granting (do not enter monitors when thread is suspended)
152 // + state transitions from _thread_in_native
153 //
154 // In general, java_suspend() does not wait for an external suspend
155 // request to complete. When it returns, the only guarantee is that
156 // the _external_suspend field is true.
157 //
158 // wait_for_ext_suspend_completion() is used to wait for an external
159 // suspend request to complete. External suspend requests are usually
160 // followed by some other interface call that requires the thread to
161 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
162 // the interface that requires quiescence, we give the JavaThread a
163 // chance to self-suspend before we need it to be quiescent. This
164 // improves overall suspend/query performance.
165 //
166 // _suspend_flags controls the behavior of java_ suspend/resume.
167 // It must be set under the protection of SR_lock. Read from the flag is
168 // OK without SR_lock as long as the value is only used as a hint.
169 // (e.g., check _external_suspend first without lock and then recheck
170 // inside SR_lock and finish the suspension)
171 //
172 // _suspend_flags is also overloaded for other "special conditions" so
173 // that a single check indicates whether any special action is needed
174 // eg. for async exceptions.
175 // -------------------------------------------------------------------
176 // Notes:
177 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
178 // but we still update its value to keep other part of the system (mainly
179 // JVMTI) happy. ThreadState is legacy code (see notes in
180 // osThread.hpp).
181 //
182 // 2. It would be more natural if set_external_suspend() is private and
183 // part of java_suspend(), but that probably would affect the suspend/query
184 // performance. Need more investigation on this.
185 //
187 // suspend/resume lock: used for self-suspend
188 Monitor* _SR_lock;
190 protected:
191 enum SuspendFlags {
192 // NOTE: avoid using the sign-bit as cc generates different test code
193 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
195 _external_suspend = 0x20000000U, // thread is asked to self suspend
196 _ext_suspended = 0x40000000U, // thread has self-suspended
197 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
199 _has_async_exception = 0x00000001U, // there is a pending async exception
200 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
201 };
203 // various suspension related flags - atomically updated
204 // overloaded for async exception checking in check_special_condition_for_native_trans.
205 volatile uint32_t _suspend_flags;
207 private:
208 int _num_nested_signal;
210 public:
211 void enter_signal_handler() { _num_nested_signal++; }
212 void leave_signal_handler() { _num_nested_signal--; }
213 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
215 private:
216 // Debug tracing
217 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
219 // Active_handles points to a block of handles
220 JNIHandleBlock* _active_handles;
222 // One-element thread local free list
223 JNIHandleBlock* _free_handle_block;
225 // Point to the last handle mark
226 HandleMark* _last_handle_mark;
228 // The parity of the last strong_roots iteration in which this thread was
229 // claimed as a task.
230 jint _oops_do_parity;
232 public:
233 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
234 HandleMark* last_handle_mark() const { return _last_handle_mark; }
235 private:
237 // debug support for checking if code does allow safepoints or not
238 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
239 // mutex, or blocking on an object synchronizer (Java locking).
240 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
241 // If !allow_allocation(), then an assertion failure will happen during allocation
242 // (Hence, !allow_safepoint() => !allow_allocation()).
243 //
244 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
245 //
246 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
247 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
249 // Used by SkipGCALot class.
250 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
252 // Record when GC is locked out via the GC_locker mechanism
253 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
255 friend class No_Alloc_Verifier;
256 friend class No_Safepoint_Verifier;
257 friend class Pause_No_Safepoint_Verifier;
258 friend class ThreadLocalStorage;
259 friend class GC_locker;
261 ThreadLocalAllocBuffer _tlab; // Thread-local eden
262 jlong _allocated_bytes; // Cumulative number of bytes allocated on
263 // the Java heap
265 TRACE_DATA _trace_data; // Thread-local data for tracing
267 int _vm_operation_started_count; // VM_Operation support
268 int _vm_operation_completed_count; // VM_Operation support
270 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
271 // is waiting to lock
272 bool _current_pending_monitor_is_from_java; // locking is from Java code
274 // ObjectMonitor on which this thread called Object.wait()
275 ObjectMonitor* _current_waiting_monitor;
277 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
278 public:
279 ObjectMonitor* omFreeList;
280 int omFreeCount; // length of omFreeList
281 int omFreeProvision; // reload chunk size
282 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
283 int omInUseCount; // length of omInUseList
285 #ifdef ASSERT
286 private:
287 bool _visited_for_critical_count;
289 public:
290 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
291 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
292 #endif
294 public:
295 enum {
296 is_definitely_current_thread = true
297 };
299 // Constructor
300 Thread();
301 virtual ~Thread();
303 // initializtion
304 void initialize_thread_local_storage();
306 // thread entry point
307 virtual void run();
309 // Testers
310 virtual bool is_VM_thread() const { return false; }
311 virtual bool is_Java_thread() const { return false; }
312 virtual bool is_Compiler_thread() const { return false; }
313 virtual bool is_hidden_from_external_view() const { return false; }
314 virtual bool is_jvmti_agent_thread() const { return false; }
315 // True iff the thread can perform GC operations at a safepoint.
316 // Generally will be true only of VM thread and parallel GC WorkGang
317 // threads.
318 virtual bool is_GC_task_thread() const { return false; }
319 virtual bool is_Watcher_thread() const { return false; }
320 virtual bool is_ConcurrentGC_thread() const { return false; }
321 virtual bool is_Named_thread() const { return false; }
322 virtual bool is_Worker_thread() const { return false; }
324 // Casts
325 virtual WorkerThread* as_Worker_thread() const { return NULL; }
327 virtual char* name() const { return (char*)"Unknown thread"; }
329 // Returns the current thread
330 static inline Thread* current();
332 // Common thread operations
333 static void set_priority(Thread* thread, ThreadPriority priority);
334 static ThreadPriority get_priority(const Thread* const thread);
335 static void start(Thread* thread);
336 static void interrupt(Thread* thr);
337 static bool is_interrupted(Thread* thr, bool clear_interrupted);
339 void set_native_thread_name(const char *name) {
340 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
341 os::set_native_thread_name(name);
342 }
344 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
345 Monitor* SR_lock() const { return _SR_lock; }
347 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
349 void set_suspend_flag(SuspendFlags f) {
350 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
351 uint32_t flags;
352 do {
353 flags = _suspend_flags;
354 }
355 while (Atomic::cmpxchg((jint)(flags | f),
356 (volatile jint*)&_suspend_flags,
357 (jint)flags) != (jint)flags);
358 }
359 void clear_suspend_flag(SuspendFlags f) {
360 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
361 uint32_t flags;
362 do {
363 flags = _suspend_flags;
364 }
365 while (Atomic::cmpxchg((jint)(flags & ~f),
366 (volatile jint*)&_suspend_flags,
367 (jint)flags) != (jint)flags);
368 }
370 void set_has_async_exception() {
371 set_suspend_flag(_has_async_exception);
372 }
373 void clear_has_async_exception() {
374 clear_suspend_flag(_has_async_exception);
375 }
377 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
379 void set_critical_native_unlock() {
380 set_suspend_flag(_critical_native_unlock);
381 }
382 void clear_critical_native_unlock() {
383 clear_suspend_flag(_critical_native_unlock);
384 }
386 // Support for Unhandled Oop detection
387 #ifdef CHECK_UNHANDLED_OOPS
388 private:
389 UnhandledOops* _unhandled_oops;
390 public:
391 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
392 // Mark oop safe for gc. It may be stack allocated but won't move.
393 void allow_unhandled_oop(oop *op) {
394 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
395 }
396 // Clear oops at safepoint so crashes point to unhandled oop violator
397 void clear_unhandled_oops() {
398 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
399 }
400 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
401 #endif // CHECK_UNHANDLED_OOPS
403 #ifndef PRODUCT
404 bool skip_gcalot() { return _skip_gcalot; }
405 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
406 #endif
408 public:
409 // Installs a pending exception to be inserted later
410 static void send_async_exception(oop thread_oop, oop java_throwable);
412 // Resource area
413 ResourceArea* resource_area() const { return _resource_area; }
414 void set_resource_area(ResourceArea* area) { _resource_area = area; }
416 OSThread* osthread() const { return _osthread; }
417 void set_osthread(OSThread* thread) { _osthread = thread; }
419 // JNI handle support
420 JNIHandleBlock* active_handles() const { return _active_handles; }
421 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
422 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
423 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
425 // Internal handle support
426 HandleArea* handle_area() const { return _handle_area; }
427 void set_handle_area(HandleArea* area) { _handle_area = area; }
429 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
430 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
432 // Thread-Local Allocation Buffer (TLAB) support
433 ThreadLocalAllocBuffer& tlab() { return _tlab; }
434 void initialize_tlab() {
435 if (UseTLAB) {
436 tlab().initialize();
437 }
438 }
440 jlong allocated_bytes() { return _allocated_bytes; }
441 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
442 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
443 jlong cooked_allocated_bytes() {
444 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
445 if (UseTLAB) {
446 size_t used_bytes = tlab().used_bytes();
447 if ((ssize_t)used_bytes > 0) {
448 // More-or-less valid tlab. The load_acquire above should ensure
449 // that the result of the add is <= the instantaneous value
450 return allocated_bytes + used_bytes;
451 }
452 }
453 return allocated_bytes;
454 }
456 TRACE_DATA* trace_data() { return &_trace_data; }
458 // VM operation support
459 int vm_operation_ticket() { return ++_vm_operation_started_count; }
460 int vm_operation_completed_count() { return _vm_operation_completed_count; }
461 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
463 // For tracking the heavyweight monitor the thread is pending on.
464 ObjectMonitor* current_pending_monitor() {
465 return _current_pending_monitor;
466 }
467 void set_current_pending_monitor(ObjectMonitor* monitor) {
468 _current_pending_monitor = monitor;
469 }
470 void set_current_pending_monitor_is_from_java(bool from_java) {
471 _current_pending_monitor_is_from_java = from_java;
472 }
473 bool current_pending_monitor_is_from_java() {
474 return _current_pending_monitor_is_from_java;
475 }
477 // For tracking the ObjectMonitor on which this thread called Object.wait()
478 ObjectMonitor* current_waiting_monitor() {
479 return _current_waiting_monitor;
480 }
481 void set_current_waiting_monitor(ObjectMonitor* monitor) {
482 _current_waiting_monitor = monitor;
483 }
485 // GC support
486 // Apply "f->do_oop" to all root oops in "this".
487 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
488 // Used by JavaThread::oops_do.
489 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
490 virtual void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
492 // Handles the parallel case for the method below.
493 private:
494 bool claim_oops_do_par_case(int collection_parity);
495 public:
496 // Requires that "collection_parity" is that of the current strong roots
497 // iteration. If "is_par" is false, sets the parity of "this" to
498 // "collection_parity", and returns "true". If "is_par" is true,
499 // uses an atomic instruction to set the current threads parity to
500 // "collection_parity", if it is not already. Returns "true" iff the
501 // calling thread does the update, this indicates that the calling thread
502 // has claimed the thread's stack as a root groop in the current
503 // collection.
504 bool claim_oops_do(bool is_par, int collection_parity) {
505 if (!is_par) {
506 _oops_do_parity = collection_parity;
507 return true;
508 } else {
509 return claim_oops_do_par_case(collection_parity);
510 }
511 }
513 // Sweeper support
514 void nmethods_do(CodeBlobClosure* cf);
516 // jvmtiRedefineClasses support
517 void metadata_do(void f(Metadata*));
519 // Used by fast lock support
520 virtual bool is_lock_owned(address adr) const;
522 // Check if address is in the stack of the thread (not just for locks).
523 // Warning: the method can only be used on the running thread
524 bool is_in_stack(address adr) const;
525 // Check if address is in the usable part of the stack (excludes protected
526 // guard pages)
527 bool is_in_usable_stack(address adr) const;
529 // Sets this thread as starting thread. Returns failure if thread
530 // creation fails due to lack of memory, too many threads etc.
531 bool set_as_starting_thread();
533 protected:
534 // OS data associated with the thread
535 OSThread* _osthread; // Platform-specific thread information
537 // Thread local resource area for temporary allocation within the VM
538 ResourceArea* _resource_area;
540 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
542 // Thread local handle area for allocation of handles within the VM
543 HandleArea* _handle_area;
544 GrowableArray<Metadata*>* _metadata_handles;
546 // Support for stack overflow handling, get_thread, etc.
547 address _stack_base;
548 size_t _stack_size;
549 uintptr_t _self_raw_id; // used by get_thread (mutable)
550 int _lgrp_id;
552 public:
553 // Stack overflow support
554 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
556 void set_stack_base(address base) { _stack_base = base; }
557 size_t stack_size() const { return _stack_size; }
558 void set_stack_size(size_t size) { _stack_size = size; }
559 void record_stack_base_and_size();
561 bool on_local_stack(address adr) const {
562 /* QQQ this has knowledge of direction, ought to be a stack method */
563 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
564 }
566 uintptr_t self_raw_id() { return _self_raw_id; }
567 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
569 int lgrp_id() const { return _lgrp_id; }
570 void set_lgrp_id(int value) { _lgrp_id = value; }
572 // Printing
573 void print_on(outputStream* st) const;
574 void print() const { print_on(tty); }
575 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
577 // Debug-only code
578 #ifdef ASSERT
579 private:
580 // Deadlock detection support for Mutex locks. List of locks own by thread.
581 Monitor* _owned_locks;
582 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
583 // thus the friendship
584 friend class Mutex;
585 friend class Monitor;
587 public:
588 void print_owned_locks_on(outputStream* st) const;
589 void print_owned_locks() const { print_owned_locks_on(tty); }
590 Monitor* owned_locks() const { return _owned_locks; }
591 bool owns_locks() const { return owned_locks() != NULL; }
592 bool owns_locks_but_compiled_lock() const;
594 // Deadlock detection
595 bool allow_allocation() { return _allow_allocation_count == 0; }
596 ResourceMark* current_resource_mark() { return _current_resource_mark; }
597 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
598 #endif
600 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
602 private:
603 volatile int _jvmti_env_iteration_count;
605 public:
606 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
607 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
608 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
610 // Code generation
611 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
612 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
613 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
615 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
616 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
618 #define TLAB_FIELD_OFFSET(name) \
619 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
621 TLAB_FIELD_OFFSET(start)
622 TLAB_FIELD_OFFSET(end)
623 TLAB_FIELD_OFFSET(top)
624 TLAB_FIELD_OFFSET(pf_top)
625 TLAB_FIELD_OFFSET(size) // desired_size
626 TLAB_FIELD_OFFSET(refill_waste_limit)
627 TLAB_FIELD_OFFSET(number_of_refills)
628 TLAB_FIELD_OFFSET(fast_refill_waste)
629 TLAB_FIELD_OFFSET(slow_allocations)
631 #undef TLAB_FIELD_OFFSET
633 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
635 public:
636 volatile intptr_t _Stalled ;
637 volatile int _TypeTag ;
638 ParkEvent * _ParkEvent ; // for synchronized()
639 ParkEvent * _SleepEvent ; // for Thread.sleep
640 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
641 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
642 int NativeSyncRecursion ; // diagnostic
644 volatile int _OnTrap ; // Resume-at IP delta
645 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
646 jint _hashStateX ; // thread-specific hashCode generator state
647 jint _hashStateY ;
648 jint _hashStateZ ;
649 void * _schedctl ;
652 volatile jint rng [4] ; // RNG for spin loop
654 // Low-level leaf-lock primitives used to implement synchronization
655 // and native monitor-mutex infrastructure.
656 // Not for general synchronization use.
657 static void SpinAcquire (volatile int * Lock, const char * Name) ;
658 static void SpinRelease (volatile int * Lock) ;
659 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
660 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
661 static void muxRelease (volatile intptr_t * Lock) ;
662 };
664 // Inline implementation of Thread::current()
665 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
666 // startup.
667 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
668 // period. This is inlined in thread_<os_family>.inline.hpp.
670 inline Thread* Thread::current() {
671 #ifdef ASSERT
672 // This function is very high traffic. Define PARANOID to enable expensive
673 // asserts.
674 #ifdef PARANOID
675 // Signal handler should call ThreadLocalStorage::get_thread_slow()
676 Thread* t = ThreadLocalStorage::get_thread_slow();
677 assert(t != NULL && !t->is_inside_signal_handler(),
678 "Don't use Thread::current() inside signal handler");
679 #endif
680 #endif
681 Thread* thread = ThreadLocalStorage::thread();
682 assert(thread != NULL, "just checking");
683 return thread;
684 }
686 // Name support for threads. non-JavaThread subclasses with multiple
687 // uniquely named instances should derive from this.
688 class NamedThread: public Thread {
689 friend class VMStructs;
690 enum {
691 max_name_len = 64
692 };
693 private:
694 char* _name;
695 // log JavaThread being processed by oops_do
696 JavaThread* _processed_thread;
698 public:
699 NamedThread();
700 ~NamedThread();
701 // May only be called once per thread.
702 void set_name(const char* format, ...);
703 virtual bool is_Named_thread() const { return true; }
704 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
705 JavaThread *processed_thread() { return _processed_thread; }
706 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
707 };
709 // Worker threads are named and have an id of an assigned work.
710 class WorkerThread: public NamedThread {
711 private:
712 uint _id;
713 public:
714 WorkerThread() : _id(0) { }
715 virtual bool is_Worker_thread() const { return true; }
717 virtual WorkerThread* as_Worker_thread() const {
718 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
719 return (WorkerThread*) this;
720 }
722 void set_id(uint work_id) { _id = work_id; }
723 uint id() const { return _id; }
724 };
726 // A single WatcherThread is used for simulating timer interrupts.
727 class WatcherThread: public Thread {
728 friend class VMStructs;
729 public:
730 virtual void run();
732 private:
733 static WatcherThread* _watcher_thread;
735 static bool _startable;
736 volatile static bool _should_terminate; // updated without holding lock
738 os::WatcherThreadCrashProtection* _crash_protection;
739 public:
740 enum SomeConstants {
741 delay_interval = 10 // interrupt delay in milliseconds
742 };
744 // Constructor
745 WatcherThread();
747 // Tester
748 bool is_Watcher_thread() const { return true; }
750 // Printing
751 char* name() const { return (char*)"VM Periodic Task Thread"; }
752 void print_on(outputStream* st) const;
753 void print() const { print_on(tty); }
754 void unpark();
756 // Returns the single instance of WatcherThread
757 static WatcherThread* watcher_thread() { return _watcher_thread; }
759 // Create and start the single instance of WatcherThread, or stop it on shutdown
760 static void start();
761 static void stop();
762 // Only allow start once the VM is sufficiently initialized
763 // Otherwise the first task to enroll will trigger the start
764 static void make_startable();
766 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
767 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
768 _crash_protection = crash_protection;
769 }
771 bool has_crash_protection() const { return _crash_protection != NULL; }
772 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
774 private:
775 int sleep() const;
776 };
779 class CompilerThread;
781 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
783 class JavaThread: public Thread {
784 friend class VMStructs;
785 private:
786 JavaThread* _next; // The next thread in the Threads list
787 oop _threadObj; // The Java level thread object
789 #ifdef ASSERT
790 private:
791 int _java_call_counter;
793 public:
794 int java_call_counter() { return _java_call_counter; }
795 void inc_java_call_counter() { _java_call_counter++; }
796 void dec_java_call_counter() {
797 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
798 _java_call_counter--;
799 }
800 private: // restore original namespace restriction
801 #endif // ifdef ASSERT
803 #ifndef PRODUCT
804 public:
805 enum {
806 jump_ring_buffer_size = 16
807 };
808 private: // restore original namespace restriction
809 #endif
811 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
813 ThreadFunction _entry_point;
815 JNIEnv _jni_environment;
817 // Deopt support
818 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
820 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
821 // transition out of native
822 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
823 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
824 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
825 // Because deoptimization is lazy we must save jvmti requests to set locals
826 // in compiled frames until we deoptimize and we have an interpreter frame.
827 // This holds the pointer to array (yeah like there might be more than one) of
828 // description of compiled vframes that have locals that need to be updated.
829 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
831 // Handshake value for fixing 6243940. We need a place for the i2c
832 // adapter to store the callee Method*. This value is NEVER live
833 // across a gc point so it does NOT have to be gc'd
834 // The handshake is open ended since we can't be certain that it will
835 // be NULLed. This is because we rarely ever see the race and end up
836 // in handle_wrong_method which is the backend of the handshake. See
837 // code in i2c adapters and handle_wrong_method.
839 Method* _callee_target;
841 // Used to pass back results to the interpreter or generated code running Java code.
842 oop _vm_result; // oop result is GC-preserved
843 Metadata* _vm_result_2; // non-oop result
845 // See ReduceInitialCardMarks: this holds the precise space interval of
846 // the most recent slow path allocation for which compiled code has
847 // elided card-marks for performance along the fast-path.
848 MemRegion _deferred_card_mark;
850 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
851 // allocated during deoptimization
852 // and by JNI_MonitorEnter/Exit
854 // Async. requests support
855 enum AsyncRequests {
856 _no_async_condition = 0,
857 _async_exception,
858 _async_unsafe_access_error
859 };
860 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
861 oop _pending_async_exception;
863 // Safepoint support
864 public: // Expose _thread_state for SafeFetchInt()
865 volatile JavaThreadState _thread_state;
866 private:
867 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
868 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
870 // JavaThread termination support
871 enum TerminatedTypes {
872 _not_terminated = 0xDEAD - 2,
873 _thread_exiting, // JavaThread::exit() has been called for this thread
874 _thread_terminated, // JavaThread is removed from thread list
875 _vm_exited // JavaThread is still executing native code, but VM is terminated
876 // only VM_Exit can set _vm_exited
877 };
879 // In general a JavaThread's _terminated field transitions as follows:
880 //
881 // _not_terminated => _thread_exiting => _thread_terminated
882 //
883 // _vm_exited is a special value to cover the case of a JavaThread
884 // executing native code after the VM itself is terminated.
885 volatile TerminatedTypes _terminated;
886 // suspend/resume support
887 volatile bool _suspend_equivalent; // Suspend equivalent condition
888 jint _in_deopt_handler; // count of deoptimization
889 // handlers thread is in
890 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
891 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
892 // never locked) when throwing an exception. Used by interpreter only.
894 // JNI attach states:
895 enum JNIAttachStates {
896 _not_attaching_via_jni = 1, // thread is not attaching via JNI
897 _attaching_via_jni, // thread is attaching via JNI
898 _attached_via_jni // thread has attached via JNI
899 };
901 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
902 // A native thread that is attaching via JNI starts with a value
903 // of _attaching_via_jni and transitions to _attached_via_jni.
904 volatile JNIAttachStates _jni_attach_state;
906 public:
907 // State of the stack guard pages for this thread.
908 enum StackGuardState {
909 stack_guard_unused, // not needed
910 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
911 stack_guard_enabled // enabled
912 };
914 private:
916 StackGuardState _stack_guard_state;
918 // Precompute the limit of the stack as used in stack overflow checks.
919 // We load it from here to simplify the stack overflow check in assembly.
920 address _stack_overflow_limit;
922 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
923 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
924 // code)
925 volatile oop _exception_oop; // Exception thrown in compiled code
926 volatile address _exception_pc; // PC where exception happened
927 volatile address _exception_handler_pc; // PC for handler of exception
928 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
930 // support for JNI critical regions
931 jint _jni_active_critical; // count of entries into JNI critical region
933 // For deadlock detection.
934 int _depth_first_number;
936 // JVMTI PopFrame support
937 // This is set to popframe_pending to signal that top Java frame should be popped immediately
938 int _popframe_condition;
940 #ifndef PRODUCT
941 int _jmp_ring_index;
942 struct {
943 // We use intptr_t instead of address so debugger doesn't try and display strings
944 intptr_t _target;
945 intptr_t _instruction;
946 const char* _file;
947 int _line;
948 } _jmp_ring[ jump_ring_buffer_size ];
949 #endif /* PRODUCT */
951 #if INCLUDE_ALL_GCS
952 // Support for G1 barriers
954 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
955 // Set of all such queues.
956 static SATBMarkQueueSet _satb_mark_queue_set;
958 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
959 // Set of all such queues.
960 static DirtyCardQueueSet _dirty_card_queue_set;
962 void flush_barrier_queues();
963 #endif // INCLUDE_ALL_GCS
965 friend class VMThread;
966 friend class ThreadWaitTransition;
967 friend class VM_Exit;
969 void initialize(); // Initialized the instance variables
971 public:
972 // Constructor
973 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
974 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
975 ~JavaThread();
977 #ifdef ASSERT
978 // verify this JavaThread hasn't be published in the Threads::list yet
979 void verify_not_published();
980 #endif
982 //JNI functiontable getter/setter for JVMTI jni function table interception API.
983 void set_jni_functions(struct JNINativeInterface_* functionTable) {
984 _jni_environment.functions = functionTable;
985 }
986 struct JNINativeInterface_* get_jni_functions() {
987 return (struct JNINativeInterface_ *)_jni_environment.functions;
988 }
990 // This function is called at thread creation to allow
991 // platform specific thread variables to be initialized.
992 void cache_global_variables();
994 // Executes Shutdown.shutdown()
995 void invoke_shutdown_hooks();
997 // Cleanup on thread exit
998 enum ExitType {
999 normal_exit,
1000 jni_detach
1001 };
1002 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1004 void cleanup_failed_attach_current_thread();
1006 // Testers
1007 virtual bool is_Java_thread() const { return true; }
1009 // Thread chain operations
1010 JavaThread* next() const { return _next; }
1011 void set_next(JavaThread* p) { _next = p; }
1013 // Thread oop. threadObj() can be NULL for initial JavaThread
1014 // (or for threads attached via JNI)
1015 oop threadObj() const { return _threadObj; }
1016 void set_threadObj(oop p) { _threadObj = p; }
1018 ThreadPriority java_priority() const; // Read from threadObj()
1020 // Prepare thread and add to priority queue. If a priority is
1021 // not specified, use the priority of the thread object. Threads_lock
1022 // must be held while this function is called.
1023 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1025 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1026 address saved_exception_pc() { return _saved_exception_pc; }
1029 ThreadFunction entry_point() const { return _entry_point; }
1031 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1032 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1034 // Last frame anchor routines
1036 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1038 // last_Java_sp
1039 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1040 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1042 // last_Java_pc
1044 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1046 // Safepoint support
1047 #ifndef PPC64
1048 JavaThreadState thread_state() const { return _thread_state; }
1049 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1050 #else
1051 // Use membars when accessing volatile _thread_state. See
1052 // Threads::create_vm() for size checks.
1053 JavaThreadState thread_state() const {
1054 return (JavaThreadState) OrderAccess::load_acquire((volatile jint*)&_thread_state);
1055 }
1056 void set_thread_state(JavaThreadState s) {
1057 OrderAccess::release_store((volatile jint*)&_thread_state, (jint)s);
1058 }
1059 #endif
1060 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1061 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1062 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1064 // thread has called JavaThread::exit() or is terminated
1065 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1066 // thread is terminated (no longer on the threads list); we compare
1067 // against the two non-terminated values so that a freed JavaThread
1068 // will also be considered terminated.
1069 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1070 void set_terminated(TerminatedTypes t) { _terminated = t; }
1071 // special for Threads::remove() which is static:
1072 void set_terminated_value() { _terminated = _thread_terminated; }
1073 void block_if_vm_exited();
1075 bool doing_unsafe_access() { return _doing_unsafe_access; }
1076 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1078 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1079 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1081 #if INCLUDE_NMT
1082 // native memory tracking
1083 inline MemRecorder* get_recorder() const { return (MemRecorder*)_recorder; }
1084 inline void set_recorder(MemRecorder* rc) { _recorder = rc; }
1086 private:
1087 // per-thread memory recorder
1088 MemRecorder* volatile _recorder;
1089 #endif // INCLUDE_NMT
1091 // Suspend/resume support for JavaThread
1092 private:
1093 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1094 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1096 public:
1097 void java_suspend();
1098 void java_resume();
1099 int java_suspend_self();
1101 void check_and_wait_while_suspended() {
1102 assert(JavaThread::current() == this, "sanity check");
1104 bool do_self_suspend;
1105 do {
1106 // were we externally suspended while we were waiting?
1107 do_self_suspend = handle_special_suspend_equivalent_condition();
1108 if (do_self_suspend) {
1109 // don't surprise the thread that suspended us by returning
1110 java_suspend_self();
1111 set_suspend_equivalent();
1112 }
1113 } while (do_self_suspend);
1114 }
1115 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1116 // Check for async exception in addition to safepoint and suspend request.
1117 static void check_special_condition_for_native_trans(JavaThread *thread);
1119 // Same as check_special_condition_for_native_trans but finishes the
1120 // transition into thread_in_Java mode so that it can potentially
1121 // block.
1122 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1124 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1125 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1126 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1127 // Warning: is_ext_suspend_completed() may temporarily drop the
1128 // SR_lock to allow the thread to reach a stable thread state if
1129 // it is currently in a transient thread state.
1130 return is_ext_suspend_completed(false /*!called_by_wait */,
1131 SuspendRetryDelay, bits);
1132 }
1134 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1135 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1136 // passed as the count and delay parameters. Experiments with specific
1137 // calls to wait_for_ext_suspend_completion() can be done by passing
1138 // other values in the code. Experiments with all calls can be done
1139 // via the appropriate -XX options.
1140 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1142 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1143 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1145 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1146 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1147 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1149 bool is_external_suspend() const {
1150 return (_suspend_flags & _external_suspend) != 0;
1151 }
1152 // Whenever a thread transitions from native to vm/java it must suspend
1153 // if external|deopt suspend is present.
1154 bool is_suspend_after_native() const {
1155 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1156 }
1158 // external suspend request is completed
1159 bool is_ext_suspended() const {
1160 return (_suspend_flags & _ext_suspended) != 0;
1161 }
1163 bool is_external_suspend_with_lock() const {
1164 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1165 return is_external_suspend();
1166 }
1168 // Special method to handle a pending external suspend request
1169 // when a suspend equivalent condition lifts.
1170 bool handle_special_suspend_equivalent_condition() {
1171 assert(is_suspend_equivalent(),
1172 "should only be called in a suspend equivalence condition");
1173 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1174 bool ret = is_external_suspend();
1175 if (!ret) {
1176 // not about to self-suspend so clear suspend equivalence
1177 clear_suspend_equivalent();
1178 }
1179 // implied else:
1180 // We have a pending external suspend request so we leave the
1181 // suspend_equivalent flag set until java_suspend_self() sets
1182 // the ext_suspended flag and clears the suspend_equivalent
1183 // flag. This insures that wait_for_ext_suspend_completion()
1184 // will return consistent values.
1185 return ret;
1186 }
1188 // utility methods to see if we are doing some kind of suspension
1189 bool is_being_ext_suspended() const {
1190 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1191 return is_ext_suspended() || is_external_suspend();
1192 }
1194 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1196 void set_suspend_equivalent() { _suspend_equivalent = true; };
1197 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1199 // Thread.stop support
1200 void send_thread_stop(oop throwable);
1201 AsyncRequests clear_special_runtime_exit_condition() {
1202 AsyncRequests x = _special_runtime_exit_condition;
1203 _special_runtime_exit_condition = _no_async_condition;
1204 return x;
1205 }
1207 // Are any async conditions present?
1208 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1210 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1212 // these next two are also used for self-suspension and async exception support
1213 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1215 // Return true if JavaThread has an asynchronous condition or
1216 // if external suspension is requested.
1217 bool has_special_runtime_exit_condition() {
1218 // We call is_external_suspend() last since external suspend should
1219 // be less common. Because we don't use is_external_suspend_with_lock
1220 // it is possible that we won't see an asynchronous external suspend
1221 // request that has just gotten started, i.e., SR_lock grabbed but
1222 // _external_suspend field change either not made yet or not visible
1223 // yet. However, this is okay because the request is asynchronous and
1224 // we will see the new flag value the next time through. It's also
1225 // possible that the external suspend request is dropped after
1226 // we have checked is_external_suspend(), we will recheck its value
1227 // under SR_lock in java_suspend_self().
1228 return (_special_runtime_exit_condition != _no_async_condition) ||
1229 is_external_suspend() || is_deopt_suspend();
1230 }
1232 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1234 void set_pending_async_exception(oop e) {
1235 _pending_async_exception = e;
1236 _special_runtime_exit_condition = _async_exception;
1237 set_has_async_exception();
1238 }
1240 // Fast-locking support
1241 bool is_lock_owned(address adr) const;
1243 // Accessors for vframe array top
1244 // The linked list of vframe arrays are sorted on sp. This means when we
1245 // unpack the head must contain the vframe array to unpack.
1246 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1247 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1249 // Side structure for defering update of java frame locals until deopt occurs
1250 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1251 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1253 // These only really exist to make debugging deopt problems simpler
1255 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1256 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1258 // The special resourceMark used during deoptimization
1260 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1261 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1263 intptr_t* must_deopt_id() { return _must_deopt_id; }
1264 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1265 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1267 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1268 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1270 Method* callee_target() const { return _callee_target; }
1271 void set_callee_target (Method* x) { _callee_target = x; }
1273 // Oop results of vm runtime calls
1274 oop vm_result() const { return _vm_result; }
1275 void set_vm_result (oop x) { _vm_result = x; }
1277 Metadata* vm_result_2() const { return _vm_result_2; }
1278 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1280 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1281 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1283 // Exception handling for compiled methods
1284 oop exception_oop() const { return _exception_oop; }
1285 address exception_pc() const { return _exception_pc; }
1286 address exception_handler_pc() const { return _exception_handler_pc; }
1287 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1289 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1290 void set_exception_pc(address a) { _exception_pc = a; }
1291 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1292 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1294 void clear_exception_oop_and_pc() {
1295 set_exception_oop(NULL);
1296 set_exception_pc(NULL);
1297 }
1299 // Stack overflow support
1300 inline size_t stack_available(address cur_sp);
1301 address stack_yellow_zone_base()
1302 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1303 size_t stack_yellow_zone_size()
1304 { return StackYellowPages * os::vm_page_size(); }
1305 address stack_red_zone_base()
1306 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1307 size_t stack_red_zone_size()
1308 { return StackRedPages * os::vm_page_size(); }
1309 bool in_stack_yellow_zone(address a)
1310 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1311 bool in_stack_red_zone(address a)
1312 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1314 void create_stack_guard_pages();
1315 void remove_stack_guard_pages();
1317 void enable_stack_yellow_zone();
1318 void disable_stack_yellow_zone();
1319 void enable_stack_red_zone();
1320 void disable_stack_red_zone();
1322 inline bool stack_guard_zone_unused();
1323 inline bool stack_yellow_zone_disabled();
1324 inline bool stack_yellow_zone_enabled();
1326 // Attempt to reguard the stack after a stack overflow may have occurred.
1327 // Returns true if (a) guard pages are not needed on this thread, (b) the
1328 // pages are already guarded, or (c) the pages were successfully reguarded.
1329 // Returns false if there is not enough stack space to reguard the pages, in
1330 // which case the caller should unwind a frame and try again. The argument
1331 // should be the caller's (approximate) sp.
1332 bool reguard_stack(address cur_sp);
1333 // Similar to above but see if current stackpoint is out of the guard area
1334 // and reguard if possible.
1335 bool reguard_stack(void);
1337 address stack_overflow_limit() { return _stack_overflow_limit; }
1338 void set_stack_overflow_limit() {
1339 _stack_overflow_limit = _stack_base - _stack_size +
1340 ((StackShadowPages +
1341 StackYellowPages +
1342 StackRedPages) * os::vm_page_size());
1343 }
1345 // Misc. accessors/mutators
1346 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1347 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1348 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1350 #ifndef PRODUCT
1351 void record_jump(address target, address instr, const char* file, int line);
1352 #endif /* PRODUCT */
1354 // For assembly stub generation
1355 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1356 #ifndef PRODUCT
1357 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1358 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1359 #endif /* PRODUCT */
1360 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1361 static ByteSize last_Java_sp_offset() {
1362 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1363 }
1364 static ByteSize last_Java_pc_offset() {
1365 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1366 }
1367 static ByteSize frame_anchor_offset() {
1368 return byte_offset_of(JavaThread, _anchor);
1369 }
1370 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1371 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1372 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1373 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1374 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1375 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1376 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1377 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1378 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1379 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1380 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1381 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1382 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1384 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1385 static ByteSize should_post_on_exceptions_flag_offset() {
1386 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1387 }
1389 #if INCLUDE_ALL_GCS
1390 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1391 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1392 #endif // INCLUDE_ALL_GCS
1394 // Returns the jni environment for this thread
1395 JNIEnv* jni_environment() { return &_jni_environment; }
1397 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1398 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1399 // Only return NULL if thread is off the thread list; starting to
1400 // exit should not return NULL.
1401 if (thread_from_jni_env->is_terminated()) {
1402 thread_from_jni_env->block_if_vm_exited();
1403 return NULL;
1404 } else {
1405 return thread_from_jni_env;
1406 }
1407 }
1409 // JNI critical regions. These can nest.
1410 bool in_critical() { return _jni_active_critical > 0; }
1411 bool in_last_critical() { return _jni_active_critical == 1; }
1412 void enter_critical() { assert(Thread::current() == this ||
1413 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1414 "this must be current thread or synchronizing");
1415 _jni_active_critical++; }
1416 void exit_critical() { assert(Thread::current() == this,
1417 "this must be current thread");
1418 _jni_active_critical--;
1419 assert(_jni_active_critical >= 0,
1420 "JNI critical nesting problem?"); }
1422 // For deadlock detection
1423 int depth_first_number() { return _depth_first_number; }
1424 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1426 private:
1427 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1429 public:
1430 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1431 void add_monitor_chunk(MonitorChunk* chunk);
1432 void remove_monitor_chunk(MonitorChunk* chunk);
1433 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1434 void inc_in_deopt_handler() { _in_deopt_handler++; }
1435 void dec_in_deopt_handler() {
1436 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1437 if (_in_deopt_handler > 0) { // robustness
1438 _in_deopt_handler--;
1439 }
1440 }
1442 private:
1443 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1445 public:
1447 // Frame iteration; calls the function f for all frames on the stack
1448 void frames_do(void f(frame*, const RegisterMap*));
1450 // Memory operations
1451 void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1453 // Sweeper operations
1454 void nmethods_do(CodeBlobClosure* cf);
1456 // RedefineClasses Support
1457 void metadata_do(void f(Metadata*));
1459 // Memory management operations
1460 void gc_epilogue();
1461 void gc_prologue();
1463 // Misc. operations
1464 char* name() const { return (char*)get_thread_name(); }
1465 void print_on(outputStream* st) const;
1466 void print() const { print_on(tty); }
1467 void print_value();
1468 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1469 void print_thread_state() const PRODUCT_RETURN;
1470 void print_on_error(outputStream* st, char* buf, int buflen) const;
1471 void verify();
1472 const char* get_thread_name() const;
1473 private:
1474 // factor out low-level mechanics for use in both normal and error cases
1475 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1476 public:
1477 const char* get_threadgroup_name() const;
1478 const char* get_parent_name() const;
1480 // Accessing frames
1481 frame last_frame() {
1482 _anchor.make_walkable(this);
1483 return pd_last_frame();
1484 }
1485 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1487 // Returns method at 'depth' java or native frames down the stack
1488 // Used for security checks
1489 Klass* security_get_caller_class(int depth);
1491 // Print stack trace in external format
1492 void print_stack_on(outputStream* st);
1493 void print_stack() { print_stack_on(tty); }
1495 // Print stack traces in various internal formats
1496 void trace_stack() PRODUCT_RETURN;
1497 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1498 void trace_frames() PRODUCT_RETURN;
1499 void trace_oops() PRODUCT_RETURN;
1501 // Print an annotated view of the stack frames
1502 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1503 void validate_frame_layout() {
1504 print_frame_layout(0, true);
1505 }
1507 // Returns the number of stack frames on the stack
1508 int depth() const;
1510 // Function for testing deoptimization
1511 void deoptimize();
1512 void make_zombies();
1514 void deoptimized_wrt_marked_nmethods();
1516 // Profiling operation (see fprofile.cpp)
1517 public:
1518 bool profile_last_Java_frame(frame* fr);
1520 private:
1521 ThreadProfiler* _thread_profiler;
1522 private:
1523 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1524 friend class FlatProfilerTask; // uses get_thread_profiler.
1525 friend class ThreadProfilerMark; // uses get_thread_profiler.
1526 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1527 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1528 ThreadProfiler* result = _thread_profiler;
1529 _thread_profiler = tp;
1530 return result;
1531 }
1533 // NMT (Native memory tracking) support.
1534 // This flag helps NMT to determine if this JavaThread will be blocked
1535 // at safepoint. If not, ThreadCritical is needed for writing memory records.
1536 // JavaThread is only safepoint visible when it is in Threads' thread list,
1537 // it is not visible until it is added to the list and becomes invisible
1538 // once it is removed from the list.
1539 public:
1540 bool is_safepoint_visible() const { return _safepoint_visible; }
1541 void set_safepoint_visible(bool visible) { _safepoint_visible = visible; }
1542 private:
1543 bool _safepoint_visible;
1545 // Static operations
1546 public:
1547 // Returns the running thread as a JavaThread
1548 static inline JavaThread* current();
1550 // Returns the active Java thread. Do not use this if you know you are calling
1551 // from a JavaThread, as it's slower than JavaThread::current. If called from
1552 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1553 // operation. You may not want that either.
1554 static JavaThread* active();
1556 inline CompilerThread* as_CompilerThread();
1558 public:
1559 virtual void run();
1560 void thread_main_inner();
1562 private:
1563 // PRIVILEGED STACK
1564 PrivilegedElement* _privileged_stack_top;
1565 GrowableArray<oop>* _array_for_gc;
1566 public:
1568 // Returns the privileged_stack information.
1569 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1570 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1571 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1573 public:
1574 // Thread local information maintained by JVMTI.
1575 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1576 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1577 // getter is used to get this JavaThread's JvmtiThreadState if it has
1578 // one which means NULL can be returned. JvmtiThreadState::state_for()
1579 // is used to get the specified JavaThread's JvmtiThreadState if it has
1580 // one or it allocates a new JvmtiThreadState for the JavaThread and
1581 // returns it. JvmtiThreadState::state_for() will return NULL only if
1582 // the specified JavaThread is exiting.
1583 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1584 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1585 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1586 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1588 // JVMTI PopFrame support
1589 // Setting and clearing popframe_condition
1590 // All of these enumerated values are bits. popframe_pending
1591 // indicates that a PopFrame() has been requested and not yet been
1592 // completed. popframe_processing indicates that that PopFrame() is in
1593 // the process of being completed. popframe_force_deopt_reexecution_bit
1594 // indicates that special handling is required when returning to a
1595 // deoptimized caller.
1596 enum PopCondition {
1597 popframe_inactive = 0x00,
1598 popframe_pending_bit = 0x01,
1599 popframe_processing_bit = 0x02,
1600 popframe_force_deopt_reexecution_bit = 0x04
1601 };
1602 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1603 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1604 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1605 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1606 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1607 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1608 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1609 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1610 #ifdef CC_INTERP
1611 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1612 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1613 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1614 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1615 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1616 #endif
1618 private:
1619 // Saved incoming arguments to popped frame.
1620 // Used only when popped interpreted frame returns to deoptimized frame.
1621 void* _popframe_preserved_args;
1622 int _popframe_preserved_args_size;
1624 public:
1625 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1626 void* popframe_preserved_args();
1627 ByteSize popframe_preserved_args_size();
1628 WordSize popframe_preserved_args_size_in_words();
1629 void popframe_free_preserved_args();
1632 private:
1633 JvmtiThreadState *_jvmti_thread_state;
1634 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1636 // Used by the interpreter in fullspeed mode for frame pop, method
1637 // entry, method exit and single stepping support. This field is
1638 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1639 // It can be set to zero asynchronously (i.e., without a VM operation
1640 // or a lock) so we have to be very careful.
1641 int _interp_only_mode;
1643 public:
1644 // used by the interpreter for fullspeed debugging support (see above)
1645 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1646 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1647 int get_interp_only_mode() { return _interp_only_mode; }
1648 void increment_interp_only_mode() { ++_interp_only_mode; }
1649 void decrement_interp_only_mode() { --_interp_only_mode; }
1651 // support for cached flag that indicates whether exceptions need to be posted for this thread
1652 // if this is false, we can avoid deoptimizing when events are thrown
1653 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1654 private:
1655 int _should_post_on_exceptions_flag;
1657 public:
1658 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1659 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1661 private:
1662 ThreadStatistics *_thread_stat;
1664 public:
1665 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1667 // Return a blocker object for which this thread is blocked parking.
1668 oop current_park_blocker();
1670 private:
1671 static size_t _stack_size_at_create;
1673 public:
1674 static inline size_t stack_size_at_create(void) {
1675 return _stack_size_at_create;
1676 }
1677 static inline void set_stack_size_at_create(size_t value) {
1678 _stack_size_at_create = value;
1679 }
1681 #if INCLUDE_ALL_GCS
1682 // SATB marking queue support
1683 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1684 static SATBMarkQueueSet& satb_mark_queue_set() {
1685 return _satb_mark_queue_set;
1686 }
1688 // Dirty card queue support
1689 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1690 static DirtyCardQueueSet& dirty_card_queue_set() {
1691 return _dirty_card_queue_set;
1692 }
1693 #endif // INCLUDE_ALL_GCS
1695 // This method initializes the SATB and dirty card queues before a
1696 // JavaThread is added to the Java thread list. Right now, we don't
1697 // have to do anything to the dirty card queue (it should have been
1698 // activated when the thread was created), but we have to activate
1699 // the SATB queue if the thread is created while a marking cycle is
1700 // in progress. The activation / de-activation of the SATB queues at
1701 // the beginning / end of a marking cycle is done during safepoints
1702 // so we have to make sure this method is called outside one to be
1703 // able to safely read the active field of the SATB queue set. Right
1704 // now, it is called just before the thread is added to the Java
1705 // thread list in the Threads::add() method. That method is holding
1706 // the Threads_lock which ensures we are outside a safepoint. We
1707 // cannot do the obvious and set the active field of the SATB queue
1708 // when the thread is created given that, in some cases, safepoints
1709 // might happen between the JavaThread constructor being called and the
1710 // thread being added to the Java thread list (an example of this is
1711 // when the structure for the DestroyJavaVM thread is created).
1712 #if INCLUDE_ALL_GCS
1713 void initialize_queues();
1714 #else // INCLUDE_ALL_GCS
1715 void initialize_queues() { }
1716 #endif // INCLUDE_ALL_GCS
1718 // Machine dependent stuff
1719 #ifdef TARGET_OS_ARCH_linux_x86
1720 # include "thread_linux_x86.hpp"
1721 #endif
1722 #ifdef TARGET_OS_ARCH_linux_sparc
1723 # include "thread_linux_sparc.hpp"
1724 #endif
1725 #ifdef TARGET_OS_ARCH_linux_zero
1726 # include "thread_linux_zero.hpp"
1727 #endif
1728 #ifdef TARGET_OS_ARCH_solaris_x86
1729 # include "thread_solaris_x86.hpp"
1730 #endif
1731 #ifdef TARGET_OS_ARCH_solaris_sparc
1732 # include "thread_solaris_sparc.hpp"
1733 #endif
1734 #ifdef TARGET_OS_ARCH_windows_x86
1735 # include "thread_windows_x86.hpp"
1736 #endif
1737 #ifdef TARGET_OS_ARCH_linux_arm
1738 # include "thread_linux_arm.hpp"
1739 #endif
1740 #ifdef TARGET_OS_ARCH_linux_ppc
1741 # include "thread_linux_ppc.hpp"
1742 #endif
1743 #ifdef TARGET_OS_ARCH_aix_ppc
1744 # include "thread_aix_ppc.hpp"
1745 #endif
1746 #ifdef TARGET_OS_ARCH_bsd_x86
1747 # include "thread_bsd_x86.hpp"
1748 #endif
1749 #ifdef TARGET_OS_ARCH_bsd_zero
1750 # include "thread_bsd_zero.hpp"
1751 #endif
1754 public:
1755 void set_blocked_on_compilation(bool value) {
1756 _blocked_on_compilation = value;
1757 }
1759 bool blocked_on_compilation() {
1760 return _blocked_on_compilation;
1761 }
1762 protected:
1763 bool _blocked_on_compilation;
1766 // JSR166 per-thread parker
1767 private:
1768 Parker* _parker;
1769 public:
1770 Parker* parker() { return _parker; }
1772 // Biased locking support
1773 private:
1774 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1775 public:
1776 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1777 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1779 // clearing/querying jni attach status
1780 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1781 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1782 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); }
1783 private:
1784 // This field is used to determine if a thread has claimed
1785 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1786 // otherwise its value is the par_id that has been claimed.
1787 uint _claimed_par_id;
1788 public:
1789 uint get_claimed_par_id() { return _claimed_par_id; }
1790 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1791 };
1793 // Inline implementation of JavaThread::current
1794 inline JavaThread* JavaThread::current() {
1795 Thread* thread = ThreadLocalStorage::thread();
1796 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1797 return (JavaThread*)thread;
1798 }
1800 inline CompilerThread* JavaThread::as_CompilerThread() {
1801 assert(is_Compiler_thread(), "just checking");
1802 return (CompilerThread*)this;
1803 }
1805 inline bool JavaThread::stack_guard_zone_unused() {
1806 return _stack_guard_state == stack_guard_unused;
1807 }
1809 inline bool JavaThread::stack_yellow_zone_disabled() {
1810 return _stack_guard_state == stack_guard_yellow_disabled;
1811 }
1813 inline bool JavaThread::stack_yellow_zone_enabled() {
1814 #ifdef ASSERT
1815 if (os::uses_stack_guard_pages()) {
1816 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1817 }
1818 #endif
1819 return _stack_guard_state == stack_guard_enabled;
1820 }
1822 inline size_t JavaThread::stack_available(address cur_sp) {
1823 // This code assumes java stacks grow down
1824 address low_addr; // Limit on the address for deepest stack depth
1825 if ( _stack_guard_state == stack_guard_unused) {
1826 low_addr = stack_base() - stack_size();
1827 } else {
1828 low_addr = stack_yellow_zone_base();
1829 }
1830 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1831 }
1833 // A thread used for Compilation.
1834 class CompilerThread : public JavaThread {
1835 friend class VMStructs;
1836 private:
1837 CompilerCounters* _counters;
1839 ciEnv* _env;
1840 CompileLog* _log;
1841 CompileTask* _task;
1842 CompileQueue* _queue;
1843 BufferBlob* _buffer_blob;
1845 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1846 AbstractCompiler* _compiler;
1848 public:
1850 static CompilerThread* current();
1852 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1854 bool is_Compiler_thread() const { return true; }
1855 // Hide this compiler thread from external view.
1856 bool is_hidden_from_external_view() const { return true; }
1858 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1859 AbstractCompiler* compiler() const { return _compiler; }
1861 CompileQueue* queue() const { return _queue; }
1862 CompilerCounters* counters() const { return _counters; }
1864 // Get/set the thread's compilation environment.
1865 ciEnv* env() { return _env; }
1866 void set_env(ciEnv* env) { _env = env; }
1868 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1869 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1871 // Get/set the thread's logging information
1872 CompileLog* log() { return _log; }
1873 void init_log(CompileLog* log) {
1874 // Set once, for good.
1875 assert(_log == NULL, "set only once");
1876 _log = log;
1877 }
1879 // GC support
1880 // Apply "f->do_oop" to all root oops in "this".
1881 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1882 void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1884 #ifndef PRODUCT
1885 private:
1886 IdealGraphPrinter *_ideal_graph_printer;
1887 public:
1888 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1889 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1890 #endif
1892 // Get/set the thread's current task
1893 CompileTask* task() { return _task; }
1894 void set_task(CompileTask* task) { _task = task; }
1896 // Track the nmethod currently being scanned by the sweeper
1897 void set_scanned_nmethod(nmethod* nm) {
1898 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1899 _scanned_nmethod = nm;
1900 }
1901 };
1903 inline CompilerThread* CompilerThread::current() {
1904 return JavaThread::current()->as_CompilerThread();
1905 }
1908 // The active thread queue. It also keeps track of the current used
1909 // thread priorities.
1910 class Threads: AllStatic {
1911 friend class VMStructs;
1912 private:
1913 static JavaThread* _thread_list;
1914 static int _number_of_threads;
1915 static int _number_of_non_daemon_threads;
1916 static int _return_code;
1917 #ifdef ASSERT
1918 static bool _vm_complete;
1919 #endif
1921 public:
1922 // Thread management
1923 // force_daemon is a concession to JNI, where we may need to add a
1924 // thread to the thread list before allocating its thread object
1925 static void add(JavaThread* p, bool force_daemon = false);
1926 static void remove(JavaThread* p);
1927 static bool includes(JavaThread* p);
1928 static JavaThread* first() { return _thread_list; }
1929 static void threads_do(ThreadClosure* tc);
1931 // Initializes the vm and creates the vm thread
1932 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1933 static void convert_vm_init_libraries_to_agents();
1934 static void create_vm_init_libraries();
1935 static void create_vm_init_agents();
1936 static void shutdown_vm_agents();
1937 static bool destroy_vm();
1938 // Supported VM versions via JNI
1939 // Includes JNI_VERSION_1_1
1940 static jboolean is_supported_jni_version_including_1_1(jint version);
1941 // Does not include JNI_VERSION_1_1
1942 static jboolean is_supported_jni_version(jint version);
1944 // Garbage collection
1945 static void follow_other_roots(void f(oop*));
1947 // Apply "f->do_oop" to all root oops in all threads.
1948 // This version may only be called by sequential code.
1949 static void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1950 // This version may be called by sequential or parallel code.
1951 static void possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1952 // This creates a list of GCTasks, one per thread.
1953 static void create_thread_roots_tasks(GCTaskQueue* q);
1954 // This creates a list of GCTasks, one per thread, for marking objects.
1955 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1957 // Apply "f->do_oop" to roots in all threads that
1958 // are part of compiled frames
1959 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1961 static void convert_hcode_pointers();
1962 static void restore_hcode_pointers();
1964 // Sweeper
1965 static void nmethods_do(CodeBlobClosure* cf);
1967 // RedefineClasses support
1968 static void metadata_do(void f(Metadata*));
1970 static void gc_epilogue();
1971 static void gc_prologue();
1972 #ifdef ASSERT
1973 static bool is_vm_complete() { return _vm_complete; }
1974 #endif
1976 // Verification
1977 static void verify();
1978 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1979 static void print(bool print_stacks, bool internal_format) {
1980 // this function is only used by debug.cpp
1981 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1982 }
1983 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1985 // Get Java threads that are waiting to enter a monitor. If doLock
1986 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1987 // VM needs to be at a safepoint.
1988 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1989 address monitor, bool doLock);
1991 // Get owning Java thread from the monitor's owner field. If doLock
1992 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1993 // VM needs to be at a safepoint.
1994 static JavaThread *owning_thread_from_monitor_owner(address owner,
1995 bool doLock);
1997 // Number of threads on the active threads list
1998 static int number_of_threads() { return _number_of_threads; }
1999 // Number of non-daemon threads on the active threads list
2000 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2002 // Deoptimizes all frames tied to marked nmethods
2003 static void deoptimized_wrt_marked_nmethods();
2005 };
2008 // Thread iterator
2009 class ThreadClosure: public StackObj {
2010 public:
2011 virtual void do_thread(Thread* thread) = 0;
2012 };
2014 class SignalHandlerMark: public StackObj {
2015 private:
2016 Thread* _thread;
2017 public:
2018 SignalHandlerMark(Thread* t) {
2019 _thread = t;
2020 if (_thread) _thread->enter_signal_handler();
2021 }
2022 ~SignalHandlerMark() {
2023 if (_thread) _thread->leave_signal_handler();
2024 _thread = NULL;
2025 }
2026 };
2029 #endif // SHARE_VM_RUNTIME_THREAD_HPP