Fri, 24 Jun 2016 17:12:13 +0800
[Code Reorganization] Removed GC related modifications made by Loongson, for example, UseOldNUMA.
1 /*
2 * Copyright (c) 1997, 2014, 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 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
32 #define SHARE_VM_RUNTIME_THREAD_HPP
34 #include "memory/allocation.hpp"
35 #include "memory/threadLocalAllocBuffer.hpp"
36 #include "oops/oop.hpp"
37 #include "prims/jni.h"
38 #include "prims/jvmtiExport.hpp"
39 #include "runtime/frame.hpp"
40 #include "runtime/javaFrameAnchor.hpp"
41 #include "runtime/jniHandles.hpp"
42 #include "runtime/mutexLocker.hpp"
43 #include "runtime/os.hpp"
44 #include "runtime/osThread.hpp"
45 #include "runtime/park.hpp"
46 #include "runtime/safepoint.hpp"
47 #include "runtime/stubRoutines.hpp"
48 #include "runtime/threadLocalStorage.hpp"
49 #include "runtime/unhandledOops.hpp"
50 #include "utilities/macros.hpp"
52 #if INCLUDE_NMT
53 #include "services/memRecorder.hpp"
54 #endif // INCLUDE_NMT
56 #include "trace/traceBackend.hpp"
57 #include "trace/traceMacros.hpp"
58 #include "utilities/exceptions.hpp"
59 #include "utilities/top.hpp"
60 #if INCLUDE_ALL_GCS
61 #include "gc_implementation/g1/dirtyCardQueue.hpp"
62 #include "gc_implementation/g1/satbQueue.hpp"
63 #endif // INCLUDE_ALL_GCS
64 #ifdef ZERO
65 #ifdef TARGET_ARCH_zero
66 # include "stack_zero.hpp"
67 #endif
68 #endif
70 class ThreadSafepointState;
71 class ThreadProfiler;
73 class JvmtiThreadState;
74 class JvmtiGetLoadedClassesClosure;
75 class ThreadStatistics;
76 class ConcurrentLocksDump;
77 class ParkEvent;
78 class Parker;
80 class ciEnv;
81 class CompileThread;
82 class CompileLog;
83 class CompileTask;
84 class CompileQueue;
85 class CompilerCounters;
86 class vframeArray;
88 class DeoptResourceMark;
89 class jvmtiDeferredLocalVariableSet;
91 class GCTaskQueue;
92 class ThreadClosure;
93 class IdealGraphPrinter;
95 DEBUG_ONLY(class ResourceMark;)
97 class WorkerThread;
99 // Class hierarchy
100 // - Thread
101 // - NamedThread
102 // - VMThread
103 // - ConcurrentGCThread
104 // - WorkerThread
105 // - GangWorker
106 // - GCTaskThread
107 // - JavaThread
108 // - WatcherThread
110 class Thread: public ThreadShadow {
111 friend class VMStructs;
112 private:
113 // Exception handling
114 // (Note: _pending_exception and friends are in ThreadShadow)
115 //oop _pending_exception; // pending exception for current thread
116 // const char* _exception_file; // file information for exception (debugging only)
117 // int _exception_line; // line information for exception (debugging only)
118 protected:
119 // Support for forcing alignment of thread objects for biased locking
120 void* _real_malloc_address;
121 public:
122 void* operator new(size_t size) throw() { return allocate(size, true); }
123 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
124 return allocate(size, false); }
125 void operator delete(void* p);
127 protected:
128 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
129 private:
131 // ***************************************************************
132 // Suspend and resume support
133 // ***************************************************************
134 //
135 // VM suspend/resume no longer exists - it was once used for various
136 // things including safepoints but was deprecated and finally removed
137 // in Java 7. Because VM suspension was considered "internal" Java-level
138 // suspension was considered "external", and this legacy naming scheme
139 // remains.
140 //
141 // External suspend/resume requests come from JVM_SuspendThread,
142 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
143 // ResumeThread. External
144 // suspend requests cause _external_suspend to be set and external
145 // resume requests cause _external_suspend to be cleared.
146 // External suspend requests do not nest on top of other external
147 // suspend requests. The higher level APIs reject suspend requests
148 // for already suspended threads.
149 //
150 // The external_suspend
151 // flag is checked by has_special_runtime_exit_condition() and java thread
152 // will self-suspend when handle_special_runtime_exit_condition() is
153 // called. Most uses of the _thread_blocked state in JavaThreads are
154 // considered the same as being externally suspended; if the blocking
155 // condition lifts, the JavaThread will self-suspend. Other places
156 // where VM checks for external_suspend include:
157 // + mutex granting (do not enter monitors when thread is suspended)
158 // + state transitions from _thread_in_native
159 //
160 // In general, java_suspend() does not wait for an external suspend
161 // request to complete. When it returns, the only guarantee is that
162 // the _external_suspend field is true.
163 //
164 // wait_for_ext_suspend_completion() is used to wait for an external
165 // suspend request to complete. External suspend requests are usually
166 // followed by some other interface call that requires the thread to
167 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
168 // the interface that requires quiescence, we give the JavaThread a
169 // chance to self-suspend before we need it to be quiescent. This
170 // improves overall suspend/query performance.
171 //
172 // _suspend_flags controls the behavior of java_ suspend/resume.
173 // It must be set under the protection of SR_lock. Read from the flag is
174 // OK without SR_lock as long as the value is only used as a hint.
175 // (e.g., check _external_suspend first without lock and then recheck
176 // inside SR_lock and finish the suspension)
177 //
178 // _suspend_flags is also overloaded for other "special conditions" so
179 // that a single check indicates whether any special action is needed
180 // eg. for async exceptions.
181 // -------------------------------------------------------------------
182 // Notes:
183 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
184 // but we still update its value to keep other part of the system (mainly
185 // JVMTI) happy. ThreadState is legacy code (see notes in
186 // osThread.hpp).
187 //
188 // 2. It would be more natural if set_external_suspend() is private and
189 // part of java_suspend(), but that probably would affect the suspend/query
190 // performance. Need more investigation on this.
191 //
193 // suspend/resume lock: used for self-suspend
194 Monitor* _SR_lock;
196 protected:
197 enum SuspendFlags {
198 // NOTE: avoid using the sign-bit as cc generates different test code
199 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
201 _external_suspend = 0x20000000U, // thread is asked to self suspend
202 _ext_suspended = 0x40000000U, // thread has self-suspended
203 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
205 _has_async_exception = 0x00000001U, // there is a pending async exception
206 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
207 };
209 // various suspension related flags - atomically updated
210 // overloaded for async exception checking in check_special_condition_for_native_trans.
211 volatile uint32_t _suspend_flags;
213 private:
214 int _num_nested_signal;
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; }
221 private:
222 // Debug tracing
223 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
225 // Active_handles points to a block of handles
226 JNIHandleBlock* _active_handles;
228 // One-element thread local free list
229 JNIHandleBlock* _free_handle_block;
231 // Point to the last handle mark
232 HandleMark* _last_handle_mark;
234 // The parity of the last strong_roots iteration in which this thread was
235 // claimed as a task.
236 jint _oops_do_parity;
238 public:
239 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
240 HandleMark* last_handle_mark() const { return _last_handle_mark; }
241 private:
243 // debug support for checking if code does allow safepoints or not
244 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
245 // mutex, or blocking on an object synchronizer (Java locking).
246 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
247 // If !allow_allocation(), then an assertion failure will happen during allocation
248 // (Hence, !allow_safepoint() => !allow_allocation()).
249 //
250 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
251 //
252 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
253 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
255 // Used by SkipGCALot class.
256 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
258 friend class No_Alloc_Verifier;
259 friend class No_Safepoint_Verifier;
260 friend class Pause_No_Safepoint_Verifier;
261 friend class ThreadLocalStorage;
262 friend class GC_locker;
264 ThreadLocalAllocBuffer _tlab; // Thread-local eden
265 jlong _allocated_bytes; // Cumulative number of bytes allocated on
266 // the Java heap
268 TRACE_DATA _trace_data; // Thread-local data for tracing
270 int _vm_operation_started_count; // VM_Operation support
271 int _vm_operation_completed_count; // VM_Operation support
273 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
274 // is waiting to lock
275 bool _current_pending_monitor_is_from_java; // locking is from Java code
277 // ObjectMonitor on which this thread called Object.wait()
278 ObjectMonitor* _current_waiting_monitor;
280 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
281 public:
282 ObjectMonitor* omFreeList;
283 int omFreeCount; // length of omFreeList
284 int omFreeProvision; // reload chunk size
285 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
286 int omInUseCount; // length of omInUseList
288 #ifdef ASSERT
289 private:
290 bool _visited_for_critical_count;
292 public:
293 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
294 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
295 #endif
297 public:
298 enum {
299 is_definitely_current_thread = true
300 };
302 // Constructor
303 Thread();
304 virtual ~Thread();
306 // initializtion
307 void initialize_thread_local_storage();
309 // thread entry point
310 virtual void run();
312 // Testers
313 virtual bool is_VM_thread() const { return false; }
314 virtual bool is_Java_thread() const { return false; }
315 virtual bool is_Compiler_thread() const { return false; }
316 virtual bool is_hidden_from_external_view() const { return false; }
317 virtual bool is_jvmti_agent_thread() const { return false; }
318 // True iff the thread can perform GC operations at a safepoint.
319 // Generally will be true only of VM thread and parallel GC WorkGang
320 // threads.
321 virtual bool is_GC_task_thread() const { return false; }
322 virtual bool is_Watcher_thread() const { return false; }
323 virtual bool is_ConcurrentGC_thread() const { return false; }
324 virtual bool is_Named_thread() const { return false; }
325 virtual bool is_Worker_thread() const { return false; }
327 // Casts
328 virtual WorkerThread* as_Worker_thread() const { return NULL; }
330 virtual char* name() const { return (char*)"Unknown thread"; }
332 // Returns the current thread
333 static inline Thread* current();
335 // Common thread operations
336 static void set_priority(Thread* thread, ThreadPriority priority);
337 static ThreadPriority get_priority(const Thread* const thread);
338 static void start(Thread* thread);
339 static void interrupt(Thread* thr);
340 static bool is_interrupted(Thread* thr, bool clear_interrupted);
342 void set_native_thread_name(const char *name) {
343 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
344 os::set_native_thread_name(name);
345 }
347 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
348 Monitor* SR_lock() const { return _SR_lock; }
350 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
352 void set_suspend_flag(SuspendFlags f) {
353 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
354 uint32_t flags;
355 do {
356 flags = _suspend_flags;
357 }
358 while (Atomic::cmpxchg((jint)(flags | f),
359 (volatile jint*)&_suspend_flags,
360 (jint)flags) != (jint)flags);
361 }
362 void clear_suspend_flag(SuspendFlags f) {
363 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
364 uint32_t flags;
365 do {
366 flags = _suspend_flags;
367 }
368 while (Atomic::cmpxchg((jint)(flags & ~f),
369 (volatile jint*)&_suspend_flags,
370 (jint)flags) != (jint)flags);
371 }
373 void set_has_async_exception() {
374 set_suspend_flag(_has_async_exception);
375 }
376 void clear_has_async_exception() {
377 clear_suspend_flag(_has_async_exception);
378 }
380 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
382 void set_critical_native_unlock() {
383 set_suspend_flag(_critical_native_unlock);
384 }
385 void clear_critical_native_unlock() {
386 clear_suspend_flag(_critical_native_unlock);
387 }
389 // Support for Unhandled Oop detection
390 #ifdef CHECK_UNHANDLED_OOPS
391 private:
392 UnhandledOops* _unhandled_oops;
393 public:
394 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
395 // Mark oop safe for gc. It may be stack allocated but won't move.
396 void allow_unhandled_oop(oop *op) {
397 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
398 }
399 // Clear oops at safepoint so crashes point to unhandled oop violator
400 void clear_unhandled_oops() {
401 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
402 }
403 #endif // CHECK_UNHANDLED_OOPS
405 #ifndef PRODUCT
406 bool skip_gcalot() { return _skip_gcalot; }
407 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
408 #endif
410 public:
411 // Installs a pending exception to be inserted later
412 static void send_async_exception(oop thread_oop, oop java_throwable);
414 // Resource area
415 ResourceArea* resource_area() const { return _resource_area; }
416 void set_resource_area(ResourceArea* area) { _resource_area = area; }
418 OSThread* osthread() const { return _osthread; }
419 void set_osthread(OSThread* thread) { _osthread = thread; }
421 // JNI handle support
422 JNIHandleBlock* active_handles() const { return _active_handles; }
423 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
424 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
425 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
427 // Internal handle support
428 HandleArea* handle_area() const { return _handle_area; }
429 void set_handle_area(HandleArea* area) { _handle_area = area; }
431 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
432 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
434 // Thread-Local Allocation Buffer (TLAB) support
435 ThreadLocalAllocBuffer& tlab() { return _tlab; }
436 void initialize_tlab() {
437 if (UseTLAB) {
438 tlab().initialize();
439 }
440 }
442 jlong allocated_bytes() { return _allocated_bytes; }
443 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
444 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
445 jlong cooked_allocated_bytes() {
446 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
447 if (UseTLAB) {
448 size_t used_bytes = tlab().used_bytes();
449 if ((ssize_t)used_bytes > 0) {
450 // More-or-less valid tlab. The load_acquire above should ensure
451 // that the result of the add is <= the instantaneous value
452 return allocated_bytes + used_bytes;
453 }
454 }
455 return allocated_bytes;
456 }
458 TRACE_DATA* trace_data() { return &_trace_data; }
460 // VM operation support
461 int vm_operation_ticket() { return ++_vm_operation_started_count; }
462 int vm_operation_completed_count() { return _vm_operation_completed_count; }
463 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
465 // For tracking the heavyweight monitor the thread is pending on.
466 ObjectMonitor* current_pending_monitor() {
467 return _current_pending_monitor;
468 }
469 void set_current_pending_monitor(ObjectMonitor* monitor) {
470 _current_pending_monitor = monitor;
471 }
472 void set_current_pending_monitor_is_from_java(bool from_java) {
473 _current_pending_monitor_is_from_java = from_java;
474 }
475 bool current_pending_monitor_is_from_java() {
476 return _current_pending_monitor_is_from_java;
477 }
479 // For tracking the ObjectMonitor on which this thread called Object.wait()
480 ObjectMonitor* current_waiting_monitor() {
481 return _current_waiting_monitor;
482 }
483 void set_current_waiting_monitor(ObjectMonitor* monitor) {
484 _current_waiting_monitor = monitor;
485 }
487 // GC support
488 // Apply "f->do_oop" to all root oops in "this".
489 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
490 // Used by JavaThread::oops_do.
491 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
492 virtual void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
494 // Handles the parallel case for the method below.
495 private:
496 bool claim_oops_do_par_case(int collection_parity);
497 public:
498 // Requires that "collection_parity" is that of the current strong roots
499 // iteration. If "is_par" is false, sets the parity of "this" to
500 // "collection_parity", and returns "true". If "is_par" is true,
501 // uses an atomic instruction to set the current threads parity to
502 // "collection_parity", if it is not already. Returns "true" iff the
503 // calling thread does the update, this indicates that the calling thread
504 // has claimed the thread's stack as a root groop in the current
505 // collection.
506 bool claim_oops_do(bool is_par, int collection_parity) {
507 if (!is_par) {
508 _oops_do_parity = collection_parity;
509 return true;
510 } else {
511 return claim_oops_do_par_case(collection_parity);
512 }
513 }
515 // Sweeper support
516 void nmethods_do(CodeBlobClosure* cf);
518 // jvmtiRedefineClasses support
519 void metadata_do(void f(Metadata*));
521 // Used by fast lock support
522 virtual bool is_lock_owned(address adr) const;
524 // Check if address is in the stack of the thread (not just for locks).
525 // Warning: the method can only be used on the running thread
526 bool is_in_stack(address adr) const;
527 // Check if address is in the usable part of the stack (excludes protected
528 // guard pages)
529 bool is_in_usable_stack(address adr) const;
531 // Sets this thread as starting thread. Returns failure if thread
532 // creation fails due to lack of memory, too many threads etc.
533 bool set_as_starting_thread();
535 protected:
536 // OS data associated with the thread
537 OSThread* _osthread; // Platform-specific thread information
539 // Thread local resource area for temporary allocation within the VM
540 ResourceArea* _resource_area;
542 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
544 // Thread local handle area for allocation of handles within the VM
545 HandleArea* _handle_area;
546 GrowableArray<Metadata*>* _metadata_handles;
548 // Support for stack overflow handling, get_thread, etc.
549 address _stack_base;
550 size_t _stack_size;
551 uintptr_t _self_raw_id; // used by get_thread (mutable)
552 int _lgrp_id;
554 public:
555 // Stack overflow support
556 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
558 void set_stack_base(address base) { _stack_base = base; }
559 size_t stack_size() const { return _stack_size; }
560 void set_stack_size(size_t size) { _stack_size = size; }
561 void record_stack_base_and_size();
563 bool on_local_stack(address adr) const {
564 /* QQQ this has knowledge of direction, ought to be a stack method */
565 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
566 }
568 uintptr_t self_raw_id() { return _self_raw_id; }
569 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
571 int lgrp_id() const { return _lgrp_id; }
572 void set_lgrp_id(int value) { _lgrp_id = value; }
574 // Printing
575 void print_on(outputStream* st) const;
576 void print() const { print_on(tty); }
577 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
579 // Debug-only code
580 #ifdef ASSERT
581 private:
582 // Deadlock detection support for Mutex locks. List of locks own by thread.
583 Monitor* _owned_locks;
584 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
585 // thus the friendship
586 friend class Mutex;
587 friend class Monitor;
589 public:
590 void print_owned_locks_on(outputStream* st) const;
591 void print_owned_locks() const { print_owned_locks_on(tty); }
592 Monitor* owned_locks() const { return _owned_locks; }
593 bool owns_locks() const { return owned_locks() != NULL; }
594 bool owns_locks_but_compiled_lock() const;
596 // Deadlock detection
597 bool allow_allocation() { return _allow_allocation_count == 0; }
598 ResourceMark* current_resource_mark() { return _current_resource_mark; }
599 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
600 #endif
602 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
604 private:
605 volatile int _jvmti_env_iteration_count;
607 public:
608 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
609 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
610 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
612 // Code generation
613 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
614 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
615 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
617 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
618 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
620 #define TLAB_FIELD_OFFSET(name) \
621 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
623 TLAB_FIELD_OFFSET(start)
624 TLAB_FIELD_OFFSET(end)
625 TLAB_FIELD_OFFSET(top)
626 TLAB_FIELD_OFFSET(pf_top)
627 TLAB_FIELD_OFFSET(size) // desired_size
628 TLAB_FIELD_OFFSET(refill_waste_limit)
629 TLAB_FIELD_OFFSET(number_of_refills)
630 TLAB_FIELD_OFFSET(fast_refill_waste)
631 TLAB_FIELD_OFFSET(slow_allocations)
633 #undef TLAB_FIELD_OFFSET
635 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
637 public:
638 volatile intptr_t _Stalled ;
639 volatile int _TypeTag ;
640 ParkEvent * _ParkEvent ; // for synchronized()
641 ParkEvent * _SleepEvent ; // for Thread.sleep
642 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
643 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
644 int NativeSyncRecursion ; // diagnostic
646 volatile int _OnTrap ; // Resume-at IP delta
647 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
648 jint _hashStateX ; // thread-specific hashCode generator state
649 jint _hashStateY ;
650 jint _hashStateZ ;
651 void * _schedctl ;
654 volatile jint rng [4] ; // RNG for spin loop
656 // Low-level leaf-lock primitives used to implement synchronization
657 // and native monitor-mutex infrastructure.
658 // Not for general synchronization use.
659 static void SpinAcquire (volatile int * Lock, const char * Name) ;
660 static void SpinRelease (volatile int * Lock) ;
661 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
662 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
663 static void muxRelease (volatile intptr_t * Lock) ;
664 };
666 // Inline implementation of Thread::current()
667 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
668 // startup.
669 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
670 // period. This is inlined in thread_<os_family>.inline.hpp.
672 inline Thread* Thread::current() {
673 #ifdef ASSERT
674 // This function is very high traffic. Define PARANOID to enable expensive
675 // asserts.
676 #ifdef PARANOID
677 // Signal handler should call ThreadLocalStorage::get_thread_slow()
678 Thread* t = ThreadLocalStorage::get_thread_slow();
679 assert(t != NULL && !t->is_inside_signal_handler(),
680 "Don't use Thread::current() inside signal handler");
681 #endif
682 #endif
683 Thread* thread = ThreadLocalStorage::thread();
684 assert(thread != NULL, "just checking");
685 return thread;
686 }
688 // Name support for threads. non-JavaThread subclasses with multiple
689 // uniquely named instances should derive from this.
690 class NamedThread: public Thread {
691 friend class VMStructs;
692 enum {
693 max_name_len = 64
694 };
695 private:
696 char* _name;
697 // log JavaThread being processed by oops_do
698 JavaThread* _processed_thread;
700 public:
701 NamedThread();
702 ~NamedThread();
703 // May only be called once per thread.
704 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
705 virtual bool is_Named_thread() const { return true; }
706 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
707 JavaThread *processed_thread() { return _processed_thread; }
708 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
709 };
711 // Worker threads are named and have an id of an assigned work.
712 class WorkerThread: public NamedThread {
713 private:
714 uint _id;
715 public:
716 WorkerThread() : _id(0) { }
717 virtual bool is_Worker_thread() const { return true; }
719 virtual WorkerThread* as_Worker_thread() const {
720 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
721 return (WorkerThread*) this;
722 }
724 void set_id(uint work_id) { _id = work_id; }
725 uint id() const { return _id; }
726 };
728 // A single WatcherThread is used for simulating timer interrupts.
729 class WatcherThread: public Thread {
730 friend class VMStructs;
731 public:
732 virtual void run();
734 private:
735 static WatcherThread* _watcher_thread;
737 static bool _startable;
738 volatile static bool _should_terminate; // updated without holding lock
740 os::WatcherThreadCrashProtection* _crash_protection;
741 public:
742 enum SomeConstants {
743 delay_interval = 10 // interrupt delay in milliseconds
744 };
746 // Constructor
747 WatcherThread();
749 // Tester
750 bool is_Watcher_thread() const { return true; }
752 // Printing
753 char* name() const { return (char*)"VM Periodic Task Thread"; }
754 void print_on(outputStream* st) const;
755 void print() const { print_on(tty); }
756 void unpark();
758 // Returns the single instance of WatcherThread
759 static WatcherThread* watcher_thread() { return _watcher_thread; }
761 // Create and start the single instance of WatcherThread, or stop it on shutdown
762 static void start();
763 static void stop();
764 // Only allow start once the VM is sufficiently initialized
765 // Otherwise the first task to enroll will trigger the start
766 static void make_startable();
768 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
769 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
770 _crash_protection = crash_protection;
771 }
773 bool has_crash_protection() const { return _crash_protection != NULL; }
774 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
776 private:
777 int sleep() const;
778 };
781 class CompilerThread;
783 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
785 class JavaThread: public Thread {
786 friend class VMStructs;
787 private:
788 JavaThread* _next; // The next thread in the Threads list
789 oop _threadObj; // The Java level thread object
791 #ifdef ASSERT
792 private:
793 int _java_call_counter;
795 public:
796 int java_call_counter() { return _java_call_counter; }
797 void inc_java_call_counter() { _java_call_counter++; }
798 void dec_java_call_counter() {
799 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
800 _java_call_counter--;
801 }
802 private: // restore original namespace restriction
803 #endif // ifdef ASSERT
805 #ifndef PRODUCT
806 public:
807 enum {
808 jump_ring_buffer_size = 16
809 };
810 private: // restore original namespace restriction
811 #endif
813 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
815 ThreadFunction _entry_point;
817 JNIEnv _jni_environment;
819 // Deopt support
820 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
822 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
823 // transition out of native
824 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
825 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
826 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
827 // Because deoptimization is lazy we must save jvmti requests to set locals
828 // in compiled frames until we deoptimize and we have an interpreter frame.
829 // This holds the pointer to array (yeah like there might be more than one) of
830 // description of compiled vframes that have locals that need to be updated.
831 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
833 // Handshake value for fixing 6243940. We need a place for the i2c
834 // adapter to store the callee Method*. This value is NEVER live
835 // across a gc point so it does NOT have to be gc'd
836 // The handshake is open ended since we can't be certain that it will
837 // be NULLed. This is because we rarely ever see the race and end up
838 // in handle_wrong_method which is the backend of the handshake. See
839 // code in i2c adapters and handle_wrong_method.
841 Method* _callee_target;
843 // Used to pass back results to the interpreter or generated code running Java code.
844 oop _vm_result; // oop result is GC-preserved
845 Metadata* _vm_result_2; // non-oop result
847 // See ReduceInitialCardMarks: this holds the precise space interval of
848 // the most recent slow path allocation for which compiled code has
849 // elided card-marks for performance along the fast-path.
850 MemRegion _deferred_card_mark;
852 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
853 // allocated during deoptimization
854 // and by JNI_MonitorEnter/Exit
856 // Async. requests support
857 enum AsyncRequests {
858 _no_async_condition = 0,
859 _async_exception,
860 _async_unsafe_access_error
861 };
862 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
863 oop _pending_async_exception;
865 // Safepoint support
866 public: // Expose _thread_state for SafeFetchInt()
867 volatile JavaThreadState _thread_state;
868 private:
869 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
870 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
872 // JavaThread termination support
873 enum TerminatedTypes {
874 _not_terminated = 0xDEAD - 2,
875 _thread_exiting, // JavaThread::exit() has been called for this thread
876 _thread_terminated, // JavaThread is removed from thread list
877 _vm_exited // JavaThread is still executing native code, but VM is terminated
878 // only VM_Exit can set _vm_exited
879 };
881 // In general a JavaThread's _terminated field transitions as follows:
882 //
883 // _not_terminated => _thread_exiting => _thread_terminated
884 //
885 // _vm_exited is a special value to cover the case of a JavaThread
886 // executing native code after the VM itself is terminated.
887 volatile TerminatedTypes _terminated;
888 // suspend/resume support
889 volatile bool _suspend_equivalent; // Suspend equivalent condition
890 jint _in_deopt_handler; // count of deoptimization
891 // handlers thread is in
892 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
893 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
894 // never locked) when throwing an exception. Used by interpreter only.
896 // JNI attach states:
897 enum JNIAttachStates {
898 _not_attaching_via_jni = 1, // thread is not attaching via JNI
899 _attaching_via_jni, // thread is attaching via JNI
900 _attached_via_jni // thread has attached via JNI
901 };
903 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
904 // A native thread that is attaching via JNI starts with a value
905 // of _attaching_via_jni and transitions to _attached_via_jni.
906 volatile JNIAttachStates _jni_attach_state;
908 public:
909 // State of the stack guard pages for this thread.
910 enum StackGuardState {
911 stack_guard_unused, // not needed
912 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
913 stack_guard_enabled // enabled
914 };
916 private:
918 StackGuardState _stack_guard_state;
920 // Precompute the limit of the stack as used in stack overflow checks.
921 // We load it from here to simplify the stack overflow check in assembly.
922 address _stack_overflow_limit;
924 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
925 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
926 // code)
927 volatile oop _exception_oop; // Exception thrown in compiled code
928 volatile address _exception_pc; // PC where exception happened
929 volatile address _exception_handler_pc; // PC for handler of exception
930 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
932 // support for JNI critical regions
933 jint _jni_active_critical; // count of entries into JNI critical region
935 // For deadlock detection.
936 int _depth_first_number;
938 // JVMTI PopFrame support
939 // This is set to popframe_pending to signal that top Java frame should be popped immediately
940 int _popframe_condition;
942 #ifndef PRODUCT
943 int _jmp_ring_index;
944 struct {
945 // We use intptr_t instead of address so debugger doesn't try and display strings
946 intptr_t _target;
947 intptr_t _instruction;
948 const char* _file;
949 int _line;
950 } _jmp_ring[ jump_ring_buffer_size ];
951 #endif /* PRODUCT */
953 #if INCLUDE_ALL_GCS
954 // Support for G1 barriers
956 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
957 // Set of all such queues.
958 static SATBMarkQueueSet _satb_mark_queue_set;
960 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
961 // Set of all such queues.
962 static DirtyCardQueueSet _dirty_card_queue_set;
964 void flush_barrier_queues();
965 #endif // INCLUDE_ALL_GCS
967 friend class VMThread;
968 friend class ThreadWaitTransition;
969 friend class VM_Exit;
971 void initialize(); // Initialized the instance variables
973 public:
974 // Constructor
975 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
976 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
977 ~JavaThread();
979 #ifdef ASSERT
980 // verify this JavaThread hasn't be published in the Threads::list yet
981 void verify_not_published();
982 #endif
984 //JNI functiontable getter/setter for JVMTI jni function table interception API.
985 void set_jni_functions(struct JNINativeInterface_* functionTable) {
986 _jni_environment.functions = functionTable;
987 }
988 struct JNINativeInterface_* get_jni_functions() {
989 return (struct JNINativeInterface_ *)_jni_environment.functions;
990 }
992 // This function is called at thread creation to allow
993 // platform specific thread variables to be initialized.
994 void cache_global_variables();
996 // Executes Shutdown.shutdown()
997 void invoke_shutdown_hooks();
999 // Cleanup on thread exit
1000 enum ExitType {
1001 normal_exit,
1002 jni_detach
1003 };
1004 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1006 void cleanup_failed_attach_current_thread();
1008 // Testers
1009 virtual bool is_Java_thread() const { return true; }
1011 // Thread chain operations
1012 JavaThread* next() const { return _next; }
1013 void set_next(JavaThread* p) { _next = p; }
1015 // Thread oop. threadObj() can be NULL for initial JavaThread
1016 // (or for threads attached via JNI)
1017 oop threadObj() const { return _threadObj; }
1018 void set_threadObj(oop p) { _threadObj = p; }
1020 ThreadPriority java_priority() const; // Read from threadObj()
1022 // Prepare thread and add to priority queue. If a priority is
1023 // not specified, use the priority of the thread object. Threads_lock
1024 // must be held while this function is called.
1025 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1027 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1028 address saved_exception_pc() { return _saved_exception_pc; }
1031 ThreadFunction entry_point() const { return _entry_point; }
1033 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1034 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1036 // Last frame anchor routines
1038 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1040 // last_Java_sp
1041 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1042 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1044 // last_Java_pc
1046 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1048 // Safepoint support
1049 #ifndef PPC64
1050 JavaThreadState thread_state() const { return _thread_state; }
1051 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1052 #else
1053 // Use membars when accessing volatile _thread_state. See
1054 // Threads::create_vm() for size checks.
1055 JavaThreadState thread_state() const {
1056 return (JavaThreadState) OrderAccess::load_acquire((volatile jint*)&_thread_state);
1057 }
1058 void set_thread_state(JavaThreadState s) {
1059 OrderAccess::release_store((volatile jint*)&_thread_state, (jint)s);
1060 }
1061 #endif
1062 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1063 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1064 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1066 // thread has called JavaThread::exit() or is terminated
1067 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1068 // thread is terminated (no longer on the threads list); we compare
1069 // against the two non-terminated values so that a freed JavaThread
1070 // will also be considered terminated.
1071 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1072 void set_terminated(TerminatedTypes t) { _terminated = t; }
1073 // special for Threads::remove() which is static:
1074 void set_terminated_value() { _terminated = _thread_terminated; }
1075 void block_if_vm_exited();
1077 bool doing_unsafe_access() { return _doing_unsafe_access; }
1078 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1080 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1081 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1083 #if INCLUDE_NMT
1084 // native memory tracking
1085 inline MemRecorder* get_recorder() const { return (MemRecorder*)_recorder; }
1086 inline void set_recorder(MemRecorder* rc) { _recorder = rc; }
1088 private:
1089 // per-thread memory recorder
1090 MemRecorder* volatile _recorder;
1091 #endif // INCLUDE_NMT
1093 // Suspend/resume support for JavaThread
1094 private:
1095 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1096 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1098 public:
1099 void java_suspend();
1100 void java_resume();
1101 int java_suspend_self();
1103 void check_and_wait_while_suspended() {
1104 assert(JavaThread::current() == this, "sanity check");
1106 bool do_self_suspend;
1107 do {
1108 // were we externally suspended while we were waiting?
1109 do_self_suspend = handle_special_suspend_equivalent_condition();
1110 if (do_self_suspend) {
1111 // don't surprise the thread that suspended us by returning
1112 java_suspend_self();
1113 set_suspend_equivalent();
1114 }
1115 } while (do_self_suspend);
1116 }
1117 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1118 // Check for async exception in addition to safepoint and suspend request.
1119 static void check_special_condition_for_native_trans(JavaThread *thread);
1121 // Same as check_special_condition_for_native_trans but finishes the
1122 // transition into thread_in_Java mode so that it can potentially
1123 // block.
1124 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1126 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1127 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1128 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1129 // Warning: is_ext_suspend_completed() may temporarily drop the
1130 // SR_lock to allow the thread to reach a stable thread state if
1131 // it is currently in a transient thread state.
1132 return is_ext_suspend_completed(false /*!called_by_wait */,
1133 SuspendRetryDelay, bits);
1134 }
1136 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1137 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1138 // passed as the count and delay parameters. Experiments with specific
1139 // calls to wait_for_ext_suspend_completion() can be done by passing
1140 // other values in the code. Experiments with all calls can be done
1141 // via the appropriate -XX options.
1142 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1144 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1145 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1147 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1148 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1149 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1151 bool is_external_suspend() const {
1152 return (_suspend_flags & _external_suspend) != 0;
1153 }
1154 // Whenever a thread transitions from native to vm/java it must suspend
1155 // if external|deopt suspend is present.
1156 bool is_suspend_after_native() const {
1157 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1158 }
1160 // external suspend request is completed
1161 bool is_ext_suspended() const {
1162 return (_suspend_flags & _ext_suspended) != 0;
1163 }
1165 bool is_external_suspend_with_lock() const {
1166 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1167 return is_external_suspend();
1168 }
1170 // Special method to handle a pending external suspend request
1171 // when a suspend equivalent condition lifts.
1172 bool handle_special_suspend_equivalent_condition() {
1173 assert(is_suspend_equivalent(),
1174 "should only be called in a suspend equivalence condition");
1175 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1176 bool ret = is_external_suspend();
1177 if (!ret) {
1178 // not about to self-suspend so clear suspend equivalence
1179 clear_suspend_equivalent();
1180 }
1181 // implied else:
1182 // We have a pending external suspend request so we leave the
1183 // suspend_equivalent flag set until java_suspend_self() sets
1184 // the ext_suspended flag and clears the suspend_equivalent
1185 // flag. This insures that wait_for_ext_suspend_completion()
1186 // will return consistent values.
1187 return ret;
1188 }
1190 // utility methods to see if we are doing some kind of suspension
1191 bool is_being_ext_suspended() const {
1192 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1193 return is_ext_suspended() || is_external_suspend();
1194 }
1196 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1198 void set_suspend_equivalent() { _suspend_equivalent = true; };
1199 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1201 // Thread.stop support
1202 void send_thread_stop(oop throwable);
1203 AsyncRequests clear_special_runtime_exit_condition() {
1204 AsyncRequests x = _special_runtime_exit_condition;
1205 _special_runtime_exit_condition = _no_async_condition;
1206 return x;
1207 }
1209 // Are any async conditions present?
1210 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1212 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1214 // these next two are also used for self-suspension and async exception support
1215 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1217 // Return true if JavaThread has an asynchronous condition or
1218 // if external suspension is requested.
1219 bool has_special_runtime_exit_condition() {
1220 // We call is_external_suspend() last since external suspend should
1221 // be less common. Because we don't use is_external_suspend_with_lock
1222 // it is possible that we won't see an asynchronous external suspend
1223 // request that has just gotten started, i.e., SR_lock grabbed but
1224 // _external_suspend field change either not made yet or not visible
1225 // yet. However, this is okay because the request is asynchronous and
1226 // we will see the new flag value the next time through. It's also
1227 // possible that the external suspend request is dropped after
1228 // we have checked is_external_suspend(), we will recheck its value
1229 // under SR_lock in java_suspend_self().
1230 return (_special_runtime_exit_condition != _no_async_condition) ||
1231 is_external_suspend() || is_deopt_suspend();
1232 }
1234 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1236 void set_pending_async_exception(oop e) {
1237 _pending_async_exception = e;
1238 _special_runtime_exit_condition = _async_exception;
1239 set_has_async_exception();
1240 }
1242 // Fast-locking support
1243 bool is_lock_owned(address adr) const;
1245 // Accessors for vframe array top
1246 // The linked list of vframe arrays are sorted on sp. This means when we
1247 // unpack the head must contain the vframe array to unpack.
1248 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1249 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1251 // Side structure for defering update of java frame locals until deopt occurs
1252 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1253 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1255 // These only really exist to make debugging deopt problems simpler
1257 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1258 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1260 // The special resourceMark used during deoptimization
1262 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1263 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1265 intptr_t* must_deopt_id() { return _must_deopt_id; }
1266 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1267 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1269 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1270 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1272 Method* callee_target() const { return _callee_target; }
1273 void set_callee_target (Method* x) { _callee_target = x; }
1275 // Oop results of vm runtime calls
1276 oop vm_result() const { return _vm_result; }
1277 void set_vm_result (oop x) { _vm_result = x; }
1279 Metadata* vm_result_2() const { return _vm_result_2; }
1280 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1282 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1283 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1285 // Exception handling for compiled methods
1286 oop exception_oop() const { return _exception_oop; }
1287 address exception_pc() const { return _exception_pc; }
1288 address exception_handler_pc() const { return _exception_handler_pc; }
1289 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1291 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1292 void set_exception_pc(address a) { _exception_pc = a; }
1293 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1294 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1296 void clear_exception_oop_and_pc() {
1297 set_exception_oop(NULL);
1298 set_exception_pc(NULL);
1299 }
1301 // Stack overflow support
1302 inline size_t stack_available(address cur_sp);
1303 address stack_yellow_zone_base()
1304 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1305 size_t stack_yellow_zone_size()
1306 { return StackYellowPages * os::vm_page_size(); }
1307 address stack_red_zone_base()
1308 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1309 size_t stack_red_zone_size()
1310 { return StackRedPages * os::vm_page_size(); }
1311 bool in_stack_yellow_zone(address a)
1312 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1313 bool in_stack_red_zone(address a)
1314 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1316 void create_stack_guard_pages();
1317 void remove_stack_guard_pages();
1319 void enable_stack_yellow_zone();
1320 void disable_stack_yellow_zone();
1321 void enable_stack_red_zone();
1322 void disable_stack_red_zone();
1324 inline bool stack_guard_zone_unused();
1325 inline bool stack_yellow_zone_disabled();
1326 inline bool stack_yellow_zone_enabled();
1328 // Attempt to reguard the stack after a stack overflow may have occurred.
1329 // Returns true if (a) guard pages are not needed on this thread, (b) the
1330 // pages are already guarded, or (c) the pages were successfully reguarded.
1331 // Returns false if there is not enough stack space to reguard the pages, in
1332 // which case the caller should unwind a frame and try again. The argument
1333 // should be the caller's (approximate) sp.
1334 bool reguard_stack(address cur_sp);
1335 // Similar to above but see if current stackpoint is out of the guard area
1336 // and reguard if possible.
1337 bool reguard_stack(void);
1339 address stack_overflow_limit() { return _stack_overflow_limit; }
1340 void set_stack_overflow_limit() {
1341 _stack_overflow_limit = _stack_base - _stack_size +
1342 ((StackShadowPages +
1343 StackYellowPages +
1344 StackRedPages) * os::vm_page_size());
1345 }
1347 // Misc. accessors/mutators
1348 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1349 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1350 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1352 #ifndef PRODUCT
1353 void record_jump(address target, address instr, const char* file, int line);
1354 #endif /* PRODUCT */
1356 // For assembly stub generation
1357 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1358 #ifndef PRODUCT
1359 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1360 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1361 #endif /* PRODUCT */
1362 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1363 static ByteSize last_Java_sp_offset() {
1364 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1365 }
1366 static ByteSize last_Java_pc_offset() {
1367 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1368 }
1369 static ByteSize frame_anchor_offset() {
1370 return byte_offset_of(JavaThread, _anchor);
1371 }
1372 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1373 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1374 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1375 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1376 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1377 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1378 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1379 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1380 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1381 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1382 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1383 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1384 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1386 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1387 static ByteSize should_post_on_exceptions_flag_offset() {
1388 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1389 }
1391 #if INCLUDE_ALL_GCS
1392 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1393 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1394 #endif // INCLUDE_ALL_GCS
1396 // Returns the jni environment for this thread
1397 JNIEnv* jni_environment() { return &_jni_environment; }
1399 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1400 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1401 // Only return NULL if thread is off the thread list; starting to
1402 // exit should not return NULL.
1403 if (thread_from_jni_env->is_terminated()) {
1404 thread_from_jni_env->block_if_vm_exited();
1405 return NULL;
1406 } else {
1407 return thread_from_jni_env;
1408 }
1409 }
1411 // JNI critical regions. These can nest.
1412 bool in_critical() { return _jni_active_critical > 0; }
1413 bool in_last_critical() { return _jni_active_critical == 1; }
1414 void enter_critical() { assert(Thread::current() == this ||
1415 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1416 "this must be current thread or synchronizing");
1417 _jni_active_critical++; }
1418 void exit_critical() { assert(Thread::current() == this,
1419 "this must be current thread");
1420 _jni_active_critical--;
1421 assert(_jni_active_critical >= 0,
1422 "JNI critical nesting problem?"); }
1424 // For deadlock detection
1425 int depth_first_number() { return _depth_first_number; }
1426 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1428 private:
1429 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1431 public:
1432 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1433 void add_monitor_chunk(MonitorChunk* chunk);
1434 void remove_monitor_chunk(MonitorChunk* chunk);
1435 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1436 void inc_in_deopt_handler() { _in_deopt_handler++; }
1437 void dec_in_deopt_handler() {
1438 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1439 if (_in_deopt_handler > 0) { // robustness
1440 _in_deopt_handler--;
1441 }
1442 }
1444 private:
1445 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1447 public:
1449 // Frame iteration; calls the function f for all frames on the stack
1450 void frames_do(void f(frame*, const RegisterMap*));
1452 // Memory operations
1453 void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1455 // Sweeper operations
1456 void nmethods_do(CodeBlobClosure* cf);
1458 // RedefineClasses Support
1459 void metadata_do(void f(Metadata*));
1461 // Memory management operations
1462 void gc_epilogue();
1463 void gc_prologue();
1465 // Misc. operations
1466 char* name() const { return (char*)get_thread_name(); }
1467 void print_on(outputStream* st) const;
1468 void print() const { print_on(tty); }
1469 void print_value();
1470 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1471 void print_thread_state() const PRODUCT_RETURN;
1472 void print_on_error(outputStream* st, char* buf, int buflen) const;
1473 void verify();
1474 const char* get_thread_name() const;
1475 private:
1476 // factor out low-level mechanics for use in both normal and error cases
1477 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1478 public:
1479 const char* get_threadgroup_name() const;
1480 const char* get_parent_name() const;
1482 // Accessing frames
1483 frame last_frame() {
1484 _anchor.make_walkable(this);
1485 return pd_last_frame();
1486 }
1487 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1489 // Returns method at 'depth' java or native frames down the stack
1490 // Used for security checks
1491 Klass* security_get_caller_class(int depth);
1493 // Print stack trace in external format
1494 void print_stack_on(outputStream* st);
1495 void print_stack() { print_stack_on(tty); }
1497 // Print stack traces in various internal formats
1498 void trace_stack() PRODUCT_RETURN;
1499 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1500 void trace_frames() PRODUCT_RETURN;
1501 void trace_oops() PRODUCT_RETURN;
1503 // Print an annotated view of the stack frames
1504 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1505 void validate_frame_layout() {
1506 print_frame_layout(0, true);
1507 }
1509 // Returns the number of stack frames on the stack
1510 int depth() const;
1512 // Function for testing deoptimization
1513 void deoptimize();
1514 void make_zombies();
1516 void deoptimized_wrt_marked_nmethods();
1518 // Profiling operation (see fprofile.cpp)
1519 public:
1520 bool profile_last_Java_frame(frame* fr);
1522 private:
1523 ThreadProfiler* _thread_profiler;
1524 private:
1525 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1526 friend class FlatProfilerTask; // uses get_thread_profiler.
1527 friend class ThreadProfilerMark; // uses get_thread_profiler.
1528 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1529 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1530 ThreadProfiler* result = _thread_profiler;
1531 _thread_profiler = tp;
1532 return result;
1533 }
1535 // NMT (Native memory tracking) support.
1536 // This flag helps NMT to determine if this JavaThread will be blocked
1537 // at safepoint. If not, ThreadCritical is needed for writing memory records.
1538 // JavaThread is only safepoint visible when it is in Threads' thread list,
1539 // it is not visible until it is added to the list and becomes invisible
1540 // once it is removed from the list.
1541 public:
1542 bool is_safepoint_visible() const { return _safepoint_visible; }
1543 void set_safepoint_visible(bool visible) { _safepoint_visible = visible; }
1544 private:
1545 bool _safepoint_visible;
1547 // Static operations
1548 public:
1549 // Returns the running thread as a JavaThread
1550 static inline JavaThread* current();
1552 // Returns the active Java thread. Do not use this if you know you are calling
1553 // from a JavaThread, as it's slower than JavaThread::current. If called from
1554 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1555 // operation. You may not want that either.
1556 static JavaThread* active();
1558 inline CompilerThread* as_CompilerThread();
1560 public:
1561 virtual void run();
1562 void thread_main_inner();
1564 private:
1565 // PRIVILEGED STACK
1566 PrivilegedElement* _privileged_stack_top;
1567 GrowableArray<oop>* _array_for_gc;
1568 public:
1570 // Returns the privileged_stack information.
1571 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1572 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1573 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1575 public:
1576 // Thread local information maintained by JVMTI.
1577 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1578 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1579 // getter is used to get this JavaThread's JvmtiThreadState if it has
1580 // one which means NULL can be returned. JvmtiThreadState::state_for()
1581 // is used to get the specified JavaThread's JvmtiThreadState if it has
1582 // one or it allocates a new JvmtiThreadState for the JavaThread and
1583 // returns it. JvmtiThreadState::state_for() will return NULL only if
1584 // the specified JavaThread is exiting.
1585 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1586 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1587 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1588 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1590 // JVMTI PopFrame support
1591 // Setting and clearing popframe_condition
1592 // All of these enumerated values are bits. popframe_pending
1593 // indicates that a PopFrame() has been requested and not yet been
1594 // completed. popframe_processing indicates that that PopFrame() is in
1595 // the process of being completed. popframe_force_deopt_reexecution_bit
1596 // indicates that special handling is required when returning to a
1597 // deoptimized caller.
1598 enum PopCondition {
1599 popframe_inactive = 0x00,
1600 popframe_pending_bit = 0x01,
1601 popframe_processing_bit = 0x02,
1602 popframe_force_deopt_reexecution_bit = 0x04
1603 };
1604 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1605 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1606 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1607 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1608 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1609 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1610 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1611 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1612 #ifdef CC_INTERP
1613 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1614 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1615 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1616 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1617 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1618 #endif
1620 private:
1621 // Saved incoming arguments to popped frame.
1622 // Used only when popped interpreted frame returns to deoptimized frame.
1623 void* _popframe_preserved_args;
1624 int _popframe_preserved_args_size;
1626 public:
1627 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1628 void* popframe_preserved_args();
1629 ByteSize popframe_preserved_args_size();
1630 WordSize popframe_preserved_args_size_in_words();
1631 void popframe_free_preserved_args();
1634 private:
1635 JvmtiThreadState *_jvmti_thread_state;
1636 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1638 // Used by the interpreter in fullspeed mode for frame pop, method
1639 // entry, method exit and single stepping support. This field is
1640 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1641 // It can be set to zero asynchronously (i.e., without a VM operation
1642 // or a lock) so we have to be very careful.
1643 int _interp_only_mode;
1645 public:
1646 // used by the interpreter for fullspeed debugging support (see above)
1647 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1648 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1649 int get_interp_only_mode() { return _interp_only_mode; }
1650 void increment_interp_only_mode() { ++_interp_only_mode; }
1651 void decrement_interp_only_mode() { --_interp_only_mode; }
1653 // support for cached flag that indicates whether exceptions need to be posted for this thread
1654 // if this is false, we can avoid deoptimizing when events are thrown
1655 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1656 private:
1657 int _should_post_on_exceptions_flag;
1659 public:
1660 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1661 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1663 private:
1664 ThreadStatistics *_thread_stat;
1666 public:
1667 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1669 // Return a blocker object for which this thread is blocked parking.
1670 oop current_park_blocker();
1672 private:
1673 static size_t _stack_size_at_create;
1675 public:
1676 static inline size_t stack_size_at_create(void) {
1677 return _stack_size_at_create;
1678 }
1679 static inline void set_stack_size_at_create(size_t value) {
1680 _stack_size_at_create = value;
1681 }
1683 #if INCLUDE_ALL_GCS
1684 // SATB marking queue support
1685 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1686 static SATBMarkQueueSet& satb_mark_queue_set() {
1687 return _satb_mark_queue_set;
1688 }
1690 // Dirty card queue support
1691 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1692 static DirtyCardQueueSet& dirty_card_queue_set() {
1693 return _dirty_card_queue_set;
1694 }
1695 #endif // INCLUDE_ALL_GCS
1697 // This method initializes the SATB and dirty card queues before a
1698 // JavaThread is added to the Java thread list. Right now, we don't
1699 // have to do anything to the dirty card queue (it should have been
1700 // activated when the thread was created), but we have to activate
1701 // the SATB queue if the thread is created while a marking cycle is
1702 // in progress. The activation / de-activation of the SATB queues at
1703 // the beginning / end of a marking cycle is done during safepoints
1704 // so we have to make sure this method is called outside one to be
1705 // able to safely read the active field of the SATB queue set. Right
1706 // now, it is called just before the thread is added to the Java
1707 // thread list in the Threads::add() method. That method is holding
1708 // the Threads_lock which ensures we are outside a safepoint. We
1709 // cannot do the obvious and set the active field of the SATB queue
1710 // when the thread is created given that, in some cases, safepoints
1711 // might happen between the JavaThread constructor being called and the
1712 // thread being added to the Java thread list (an example of this is
1713 // when the structure for the DestroyJavaVM thread is created).
1714 #if INCLUDE_ALL_GCS
1715 void initialize_queues();
1716 #else // INCLUDE_ALL_GCS
1717 void initialize_queues() { }
1718 #endif // INCLUDE_ALL_GCS
1720 // Machine dependent stuff
1721 #ifdef TARGET_OS_ARCH_linux_x86
1722 # include "thread_linux_x86.hpp"
1723 #endif
1724 #ifdef TARGET_OS_ARCH_linux_mips
1725 # include "thread_linux_mips.hpp"
1726 #endif
1727 #ifdef TARGET_OS_ARCH_linux_sparc
1728 # include "thread_linux_sparc.hpp"
1729 #endif
1730 #ifdef TARGET_OS_ARCH_linux_zero
1731 # include "thread_linux_zero.hpp"
1732 #endif
1733 #ifdef TARGET_OS_ARCH_solaris_x86
1734 # include "thread_solaris_x86.hpp"
1735 #endif
1736 #ifdef TARGET_OS_ARCH_solaris_sparc
1737 # include "thread_solaris_sparc.hpp"
1738 #endif
1739 #ifdef TARGET_OS_ARCH_windows_x86
1740 # include "thread_windows_x86.hpp"
1741 #endif
1742 #ifdef TARGET_OS_ARCH_linux_arm
1743 # include "thread_linux_arm.hpp"
1744 #endif
1745 #ifdef TARGET_OS_ARCH_linux_ppc
1746 # include "thread_linux_ppc.hpp"
1747 #endif
1748 #ifdef TARGET_OS_ARCH_aix_ppc
1749 # include "thread_aix_ppc.hpp"
1750 #endif
1751 #ifdef TARGET_OS_ARCH_bsd_x86
1752 # include "thread_bsd_x86.hpp"
1753 #endif
1754 #ifdef TARGET_OS_ARCH_bsd_zero
1755 # include "thread_bsd_zero.hpp"
1756 #endif
1759 public:
1760 void set_blocked_on_compilation(bool value) {
1761 _blocked_on_compilation = value;
1762 }
1764 bool blocked_on_compilation() {
1765 return _blocked_on_compilation;
1766 }
1767 protected:
1768 bool _blocked_on_compilation;
1771 // JSR166 per-thread parker
1772 private:
1773 Parker* _parker;
1774 public:
1775 Parker* parker() { return _parker; }
1777 // Biased locking support
1778 private:
1779 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1780 public:
1781 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1782 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1784 // clearing/querying jni attach status
1785 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1786 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1787 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); }
1788 private:
1789 // This field is used to determine if a thread has claimed
1790 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1791 // otherwise its value is the par_id that has been claimed.
1792 uint _claimed_par_id;
1793 public:
1794 uint get_claimed_par_id() { return _claimed_par_id; }
1795 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1796 };
1798 // Inline implementation of JavaThread::current
1799 inline JavaThread* JavaThread::current() {
1800 Thread* thread = ThreadLocalStorage::thread();
1801 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1802 return (JavaThread*)thread;
1803 }
1805 inline CompilerThread* JavaThread::as_CompilerThread() {
1806 assert(is_Compiler_thread(), "just checking");
1807 return (CompilerThread*)this;
1808 }
1810 inline bool JavaThread::stack_guard_zone_unused() {
1811 return _stack_guard_state == stack_guard_unused;
1812 }
1814 inline bool JavaThread::stack_yellow_zone_disabled() {
1815 return _stack_guard_state == stack_guard_yellow_disabled;
1816 }
1818 inline bool JavaThread::stack_yellow_zone_enabled() {
1819 #ifdef ASSERT
1820 if (os::uses_stack_guard_pages()) {
1821 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1822 }
1823 #endif
1824 return _stack_guard_state == stack_guard_enabled;
1825 }
1827 inline size_t JavaThread::stack_available(address cur_sp) {
1828 // This code assumes java stacks grow down
1829 address low_addr; // Limit on the address for deepest stack depth
1830 if ( _stack_guard_state == stack_guard_unused) {
1831 low_addr = stack_base() - stack_size();
1832 } else {
1833 low_addr = stack_yellow_zone_base();
1834 }
1835 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1836 }
1838 // A thread used for Compilation.
1839 class CompilerThread : public JavaThread {
1840 friend class VMStructs;
1841 private:
1842 CompilerCounters* _counters;
1844 ciEnv* _env;
1845 CompileLog* _log;
1846 CompileTask* _task;
1847 CompileQueue* _queue;
1848 BufferBlob* _buffer_blob;
1850 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1851 AbstractCompiler* _compiler;
1853 public:
1855 static CompilerThread* current();
1857 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1859 bool is_Compiler_thread() const { return true; }
1860 // Hide this compiler thread from external view.
1861 bool is_hidden_from_external_view() const { return true; }
1863 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1864 AbstractCompiler* compiler() const { return _compiler; }
1866 CompileQueue* queue() const { return _queue; }
1867 CompilerCounters* counters() const { return _counters; }
1869 // Get/set the thread's compilation environment.
1870 ciEnv* env() { return _env; }
1871 void set_env(ciEnv* env) { _env = env; }
1873 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1874 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1876 // Get/set the thread's logging information
1877 CompileLog* log() { return _log; }
1878 void init_log(CompileLog* log) {
1879 // Set once, for good.
1880 assert(_log == NULL, "set only once");
1881 _log = log;
1882 }
1884 // GC support
1885 // Apply "f->do_oop" to all root oops in "this".
1886 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1887 void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1889 #ifndef PRODUCT
1890 private:
1891 IdealGraphPrinter *_ideal_graph_printer;
1892 public:
1893 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1894 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1895 #endif
1897 // Get/set the thread's current task
1898 CompileTask* task() { return _task; }
1899 void set_task(CompileTask* task) { _task = task; }
1901 // Track the nmethod currently being scanned by the sweeper
1902 void set_scanned_nmethod(nmethod* nm) {
1903 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1904 _scanned_nmethod = nm;
1905 }
1906 };
1908 inline CompilerThread* CompilerThread::current() {
1909 return JavaThread::current()->as_CompilerThread();
1910 }
1913 // The active thread queue. It also keeps track of the current used
1914 // thread priorities.
1915 class Threads: AllStatic {
1916 friend class VMStructs;
1917 private:
1918 static JavaThread* _thread_list;
1919 static int _number_of_threads;
1920 static int _number_of_non_daemon_threads;
1921 static int _return_code;
1922 #ifdef ASSERT
1923 static bool _vm_complete;
1924 #endif
1926 public:
1927 // Thread management
1928 // force_daemon is a concession to JNI, where we may need to add a
1929 // thread to the thread list before allocating its thread object
1930 static void add(JavaThread* p, bool force_daemon = false);
1931 static void remove(JavaThread* p);
1932 static bool includes(JavaThread* p);
1933 static JavaThread* first() { return _thread_list; }
1934 static void threads_do(ThreadClosure* tc);
1936 // Initializes the vm and creates the vm thread
1937 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1938 static void convert_vm_init_libraries_to_agents();
1939 static void create_vm_init_libraries();
1940 static void create_vm_init_agents();
1941 static void shutdown_vm_agents();
1942 static bool destroy_vm();
1943 // Supported VM versions via JNI
1944 // Includes JNI_VERSION_1_1
1945 static jboolean is_supported_jni_version_including_1_1(jint version);
1946 // Does not include JNI_VERSION_1_1
1947 static jboolean is_supported_jni_version(jint version);
1949 // Garbage collection
1950 static void follow_other_roots(void f(oop*));
1952 // Apply "f->do_oop" to all root oops in all threads.
1953 // This version may only be called by sequential code.
1954 static void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1955 // This version may be called by sequential or parallel code.
1956 static void possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1957 // This creates a list of GCTasks, one per thread.
1958 static void create_thread_roots_tasks(GCTaskQueue* q);
1959 // This creates a list of GCTasks, one per thread, for marking objects.
1960 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1962 // Apply "f->do_oop" to roots in all threads that
1963 // are part of compiled frames
1964 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1966 static void convert_hcode_pointers();
1967 static void restore_hcode_pointers();
1969 // Sweeper
1970 static void nmethods_do(CodeBlobClosure* cf);
1972 // RedefineClasses support
1973 static void metadata_do(void f(Metadata*));
1975 static void gc_epilogue();
1976 static void gc_prologue();
1977 #ifdef ASSERT
1978 static bool is_vm_complete() { return _vm_complete; }
1979 #endif
1981 // Verification
1982 static void verify();
1983 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1984 static void print(bool print_stacks, bool internal_format) {
1985 // this function is only used by debug.cpp
1986 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1987 }
1988 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1990 // Get Java threads that are waiting to enter a monitor. If doLock
1991 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1992 // VM needs to be at a safepoint.
1993 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1994 address monitor, bool doLock);
1996 // Get owning Java thread from the monitor's owner field. If doLock
1997 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1998 // VM needs to be at a safepoint.
1999 static JavaThread *owning_thread_from_monitor_owner(address owner,
2000 bool doLock);
2002 // Number of threads on the active threads list
2003 static int number_of_threads() { return _number_of_threads; }
2004 // Number of non-daemon threads on the active threads list
2005 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2007 // Deoptimizes all frames tied to marked nmethods
2008 static void deoptimized_wrt_marked_nmethods();
2010 };
2013 // Thread iterator
2014 class ThreadClosure: public StackObj {
2015 public:
2016 virtual void do_thread(Thread* thread) = 0;
2017 };
2019 class SignalHandlerMark: public StackObj {
2020 private:
2021 Thread* _thread;
2022 public:
2023 SignalHandlerMark(Thread* t) {
2024 _thread = t;
2025 if (_thread) _thread->enter_signal_handler();
2026 }
2027 ~SignalHandlerMark() {
2028 if (_thread) _thread->leave_signal_handler();
2029 _thread = NULL;
2030 }
2031 };
2034 #endif // SHARE_VM_RUNTIME_THREAD_HPP