Mon, 18 Jun 2012 12:29:21 -0700
7176856: add the JRE name to the error log
Reviewed-by: coleenp, jrose, kvn, twisti
Contributed-by: Krystal Mok <sajia@taobao.com>
1 /*
2 * Copyright (c) 1997, 2012, 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 "trace/tracing.hpp"
45 #include "utilities/exceptions.hpp"
46 #include "utilities/top.hpp"
47 #ifndef SERIALGC
48 #include "gc_implementation/g1/dirtyCardQueue.hpp"
49 #include "gc_implementation/g1/satbQueue.hpp"
50 #endif
51 #ifdef ZERO
52 #ifdef TARGET_ARCH_zero
53 # include "stack_zero.hpp"
54 #endif
55 #endif
57 class ThreadSafepointState;
58 class ThreadProfiler;
60 class JvmtiThreadState;
61 class JvmtiGetLoadedClassesClosure;
62 class ThreadStatistics;
63 class ConcurrentLocksDump;
64 class ParkEvent;
65 class Parker;
67 class ciEnv;
68 class CompileThread;
69 class CompileLog;
70 class CompileTask;
71 class CompileQueue;
72 class CompilerCounters;
73 class vframeArray;
75 class DeoptResourceMark;
76 class jvmtiDeferredLocalVariableSet;
78 class GCTaskQueue;
79 class ThreadClosure;
80 class IdealGraphPrinter;
82 class WorkerThread;
84 // Class hierarchy
85 // - Thread
86 // - NamedThread
87 // - VMThread
88 // - ConcurrentGCThread
89 // - WorkerThread
90 // - GangWorker
91 // - GCTaskThread
92 // - JavaThread
93 // - WatcherThread
95 class Thread: public ThreadShadow {
96 friend class VMStructs;
97 private:
98 // Exception handling
99 // (Note: _pending_exception and friends are in ThreadShadow)
100 //oop _pending_exception; // pending exception for current thread
101 // const char* _exception_file; // file information for exception (debugging only)
102 // int _exception_line; // line information for exception (debugging only)
104 // Support for forcing alignment of thread objects for biased locking
105 void* _real_malloc_address;
106 public:
107 void* operator new(size_t size);
108 void operator delete(void* p);
109 private:
111 // ***************************************************************
112 // Suspend and resume support
113 // ***************************************************************
114 //
115 // VM suspend/resume no longer exists - it was once used for various
116 // things including safepoints but was deprecated and finally removed
117 // in Java 7. Because VM suspension was considered "internal" Java-level
118 // suspension was considered "external", and this legacy naming scheme
119 // remains.
120 //
121 // External suspend/resume requests come from JVM_SuspendThread,
122 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
123 // ResumeThread. External
124 // suspend requests cause _external_suspend to be set and external
125 // resume requests cause _external_suspend to be cleared.
126 // External suspend requests do not nest on top of other external
127 // suspend requests. The higher level APIs reject suspend requests
128 // for already suspended threads.
129 //
130 // The external_suspend
131 // flag is checked by has_special_runtime_exit_condition() and java thread
132 // will self-suspend when handle_special_runtime_exit_condition() is
133 // called. Most uses of the _thread_blocked state in JavaThreads are
134 // considered the same as being externally suspended; if the blocking
135 // condition lifts, the JavaThread will self-suspend. Other places
136 // where VM checks for external_suspend include:
137 // + mutex granting (do not enter monitors when thread is suspended)
138 // + state transitions from _thread_in_native
139 //
140 // In general, java_suspend() does not wait for an external suspend
141 // request to complete. When it returns, the only guarantee is that
142 // the _external_suspend field is true.
143 //
144 // wait_for_ext_suspend_completion() is used to wait for an external
145 // suspend request to complete. External suspend requests are usually
146 // followed by some other interface call that requires the thread to
147 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
148 // the interface that requires quiescence, we give the JavaThread a
149 // chance to self-suspend before we need it to be quiescent. This
150 // improves overall suspend/query performance.
151 //
152 // _suspend_flags controls the behavior of java_ suspend/resume.
153 // It must be set under the protection of SR_lock. Read from the flag is
154 // OK without SR_lock as long as the value is only used as a hint.
155 // (e.g., check _external_suspend first without lock and then recheck
156 // inside SR_lock and finish the suspension)
157 //
158 // _suspend_flags is also overloaded for other "special conditions" so
159 // that a single check indicates whether any special action is needed
160 // eg. for async exceptions.
161 // -------------------------------------------------------------------
162 // Notes:
163 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
164 // but we still update its value to keep other part of the system (mainly
165 // JVMTI) happy. ThreadState is legacy code (see notes in
166 // osThread.hpp).
167 //
168 // 2. It would be more natural if set_external_suspend() is private and
169 // part of java_suspend(), but that probably would affect the suspend/query
170 // performance. Need more investigation on this.
171 //
173 // suspend/resume lock: used for self-suspend
174 Monitor* _SR_lock;
176 protected:
177 enum SuspendFlags {
178 // NOTE: avoid using the sign-bit as cc generates different test code
179 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
181 _external_suspend = 0x20000000U, // thread is asked to self suspend
182 _ext_suspended = 0x40000000U, // thread has self-suspended
183 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
185 _has_async_exception = 0x00000001U, // there is a pending async exception
186 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
187 };
189 // various suspension related flags - atomically updated
190 // overloaded for async exception checking in check_special_condition_for_native_trans.
191 volatile uint32_t _suspend_flags;
193 private:
194 int _num_nested_signal;
196 public:
197 void enter_signal_handler() { _num_nested_signal++; }
198 void leave_signal_handler() { _num_nested_signal--; }
199 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
201 private:
202 // Debug tracing
203 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
205 // Active_handles points to a block of handles
206 JNIHandleBlock* _active_handles;
208 // One-element thread local free list
209 JNIHandleBlock* _free_handle_block;
211 // Point to the last handle mark
212 HandleMark* _last_handle_mark;
214 // The parity of the last strong_roots iteration in which this thread was
215 // claimed as a task.
216 jint _oops_do_parity;
218 public:
219 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
220 HandleMark* last_handle_mark() const { return _last_handle_mark; }
221 private:
223 // debug support for checking if code does allow safepoints or not
224 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
225 // mutex, or blocking on an object synchronizer (Java locking).
226 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
227 // If !allow_allocation(), then an assertion failure will happen during allocation
228 // (Hence, !allow_safepoint() => !allow_allocation()).
229 //
230 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
231 //
232 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
233 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
235 // Used by SkipGCALot class.
236 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
238 // Record when GC is locked out via the GC_locker mechanism
239 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
241 friend class No_Alloc_Verifier;
242 friend class No_Safepoint_Verifier;
243 friend class Pause_No_Safepoint_Verifier;
244 friend class ThreadLocalStorage;
245 friend class GC_locker;
247 ThreadLocalAllocBuffer _tlab; // Thread-local eden
248 jlong _allocated_bytes; // Cumulative number of bytes allocated on
249 // the Java heap
251 TRACE_BUFFER _trace_buffer; // Thread-local buffer for tracing
253 int _vm_operation_started_count; // VM_Operation support
254 int _vm_operation_completed_count; // VM_Operation support
256 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
257 // is waiting to lock
258 bool _current_pending_monitor_is_from_java; // locking is from Java code
260 // ObjectMonitor on which this thread called Object.wait()
261 ObjectMonitor* _current_waiting_monitor;
263 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
264 public:
265 ObjectMonitor* omFreeList;
266 int omFreeCount; // length of omFreeList
267 int omFreeProvision; // reload chunk size
268 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
269 int omInUseCount; // length of omInUseList
271 #ifdef ASSERT
272 private:
273 bool _visited_for_critical_count;
275 public:
276 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
277 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
278 #endif
280 public:
281 enum {
282 is_definitely_current_thread = true
283 };
285 // Constructor
286 Thread();
287 virtual ~Thread();
289 // initializtion
290 void initialize_thread_local_storage();
292 // thread entry point
293 virtual void run();
295 // Testers
296 virtual bool is_VM_thread() const { return false; }
297 virtual bool is_Java_thread() const { return false; }
298 virtual bool is_Compiler_thread() const { return false; }
299 virtual bool is_hidden_from_external_view() const { return false; }
300 virtual bool is_jvmti_agent_thread() const { return false; }
301 // True iff the thread can perform GC operations at a safepoint.
302 // Generally will be true only of VM thread and parallel GC WorkGang
303 // threads.
304 virtual bool is_GC_task_thread() const { return false; }
305 virtual bool is_Watcher_thread() const { return false; }
306 virtual bool is_ConcurrentGC_thread() const { return false; }
307 virtual bool is_Named_thread() const { return false; }
308 virtual bool is_Worker_thread() const { return false; }
310 // Casts
311 virtual WorkerThread* as_Worker_thread() const { return NULL; }
313 virtual char* name() const { return (char*)"Unknown thread"; }
315 // Returns the current thread
316 static inline Thread* current();
318 // Common thread operations
319 static void set_priority(Thread* thread, ThreadPriority priority);
320 static ThreadPriority get_priority(const Thread* const thread);
321 static void start(Thread* thread);
322 static void interrupt(Thread* thr);
323 static bool is_interrupted(Thread* thr, bool clear_interrupted);
325 void set_native_thread_name(const char *name) {
326 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
327 os::set_native_thread_name(name);
328 }
330 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
331 Monitor* SR_lock() const { return _SR_lock; }
333 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
335 void set_suspend_flag(SuspendFlags f) {
336 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
337 uint32_t flags;
338 do {
339 flags = _suspend_flags;
340 }
341 while (Atomic::cmpxchg((jint)(flags | f),
342 (volatile jint*)&_suspend_flags,
343 (jint)flags) != (jint)flags);
344 }
345 void clear_suspend_flag(SuspendFlags f) {
346 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
347 uint32_t flags;
348 do {
349 flags = _suspend_flags;
350 }
351 while (Atomic::cmpxchg((jint)(flags & ~f),
352 (volatile jint*)&_suspend_flags,
353 (jint)flags) != (jint)flags);
354 }
356 void set_has_async_exception() {
357 set_suspend_flag(_has_async_exception);
358 }
359 void clear_has_async_exception() {
360 clear_suspend_flag(_has_async_exception);
361 }
363 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
365 void set_critical_native_unlock() {
366 set_suspend_flag(_critical_native_unlock);
367 }
368 void clear_critical_native_unlock() {
369 clear_suspend_flag(_critical_native_unlock);
370 }
372 // Support for Unhandled Oop detection
373 #ifdef CHECK_UNHANDLED_OOPS
374 private:
375 UnhandledOops* _unhandled_oops;
376 public:
377 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
378 // Mark oop safe for gc. It may be stack allocated but won't move.
379 void allow_unhandled_oop(oop *op) {
380 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
381 }
382 // Clear oops at safepoint so crashes point to unhandled oop violator
383 void clear_unhandled_oops() {
384 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
385 }
386 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
387 #endif // CHECK_UNHANDLED_OOPS
389 #ifndef PRODUCT
390 bool skip_gcalot() { return _skip_gcalot; }
391 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
392 #endif
394 public:
395 // Installs a pending exception to be inserted later
396 static void send_async_exception(oop thread_oop, oop java_throwable);
398 // Resource area
399 ResourceArea* resource_area() const { return _resource_area; }
400 void set_resource_area(ResourceArea* area) { _resource_area = area; }
402 OSThread* osthread() const { return _osthread; }
403 void set_osthread(OSThread* thread) { _osthread = thread; }
405 // JNI handle support
406 JNIHandleBlock* active_handles() const { return _active_handles; }
407 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
408 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
409 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
411 // Internal handle support
412 HandleArea* handle_area() const { return _handle_area; }
413 void set_handle_area(HandleArea* area) { _handle_area = area; }
415 // Thread-Local Allocation Buffer (TLAB) support
416 ThreadLocalAllocBuffer& tlab() { return _tlab; }
417 void initialize_tlab() {
418 if (UseTLAB) {
419 tlab().initialize();
420 }
421 }
423 jlong allocated_bytes() { return _allocated_bytes; }
424 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
425 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
426 jlong cooked_allocated_bytes() {
427 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
428 if (UseTLAB) {
429 size_t used_bytes = tlab().used_bytes();
430 if ((ssize_t)used_bytes > 0) {
431 // More-or-less valid tlab. The load_acquire above should ensure
432 // that the result of the add is <= the instantaneous value
433 return allocated_bytes + used_bytes;
434 }
435 }
436 return allocated_bytes;
437 }
439 TRACE_BUFFER trace_buffer() { return _trace_buffer; }
440 void set_trace_buffer(TRACE_BUFFER buf) { _trace_buffer = buf; }
442 // VM operation support
443 int vm_operation_ticket() { return ++_vm_operation_started_count; }
444 int vm_operation_completed_count() { return _vm_operation_completed_count; }
445 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
447 // For tracking the heavyweight monitor the thread is pending on.
448 ObjectMonitor* current_pending_monitor() {
449 return _current_pending_monitor;
450 }
451 void set_current_pending_monitor(ObjectMonitor* monitor) {
452 _current_pending_monitor = monitor;
453 }
454 void set_current_pending_monitor_is_from_java(bool from_java) {
455 _current_pending_monitor_is_from_java = from_java;
456 }
457 bool current_pending_monitor_is_from_java() {
458 return _current_pending_monitor_is_from_java;
459 }
461 // For tracking the ObjectMonitor on which this thread called Object.wait()
462 ObjectMonitor* current_waiting_monitor() {
463 return _current_waiting_monitor;
464 }
465 void set_current_waiting_monitor(ObjectMonitor* monitor) {
466 _current_waiting_monitor = monitor;
467 }
469 // GC support
470 // Apply "f->do_oop" to all root oops in "this".
471 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
472 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf);
474 // Handles the parallel case for the method below.
475 private:
476 bool claim_oops_do_par_case(int collection_parity);
477 public:
478 // Requires that "collection_parity" is that of the current strong roots
479 // iteration. If "is_par" is false, sets the parity of "this" to
480 // "collection_parity", and returns "true". If "is_par" is true,
481 // uses an atomic instruction to set the current threads parity to
482 // "collection_parity", if it is not already. Returns "true" iff the
483 // calling thread does the update, this indicates that the calling thread
484 // has claimed the thread's stack as a root groop in the current
485 // collection.
486 bool claim_oops_do(bool is_par, int collection_parity) {
487 if (!is_par) {
488 _oops_do_parity = collection_parity;
489 return true;
490 } else {
491 return claim_oops_do_par_case(collection_parity);
492 }
493 }
495 // Sweeper support
496 void nmethods_do(CodeBlobClosure* cf);
498 // Used by fast lock support
499 virtual bool is_lock_owned(address adr) const;
501 // Check if address is in the stack of the thread (not just for locks).
502 // Warning: the method can only be used on the running thread
503 bool is_in_stack(address adr) const;
505 // Sets this thread as starting thread. Returns failure if thread
506 // creation fails due to lack of memory, too many threads etc.
507 bool set_as_starting_thread();
509 protected:
510 // OS data associated with the thread
511 OSThread* _osthread; // Platform-specific thread information
513 // Thread local resource area for temporary allocation within the VM
514 ResourceArea* _resource_area;
516 // Thread local handle area for allocation of handles within the VM
517 HandleArea* _handle_area;
519 // Support for stack overflow handling, get_thread, etc.
520 address _stack_base;
521 size_t _stack_size;
522 uintptr_t _self_raw_id; // used by get_thread (mutable)
523 int _lgrp_id;
525 public:
526 // Stack overflow support
527 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
529 void set_stack_base(address base) { _stack_base = base; }
530 size_t stack_size() const { return _stack_size; }
531 void set_stack_size(size_t size) { _stack_size = size; }
532 void record_stack_base_and_size();
534 bool on_local_stack(address adr) const {
535 /* QQQ this has knowledge of direction, ought to be a stack method */
536 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
537 }
539 uintptr_t self_raw_id() { return _self_raw_id; }
540 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
542 int lgrp_id() const { return _lgrp_id; }
543 void set_lgrp_id(int value) { _lgrp_id = value; }
545 // Printing
546 void print_on(outputStream* st) const;
547 void print() const { print_on(tty); }
548 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
550 // Debug-only code
552 #ifdef ASSERT
553 private:
554 // Deadlock detection support for Mutex locks. List of locks own by thread.
555 Monitor* _owned_locks;
556 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
557 // thus the friendship
558 friend class Mutex;
559 friend class Monitor;
561 public:
562 void print_owned_locks_on(outputStream* st) const;
563 void print_owned_locks() const { print_owned_locks_on(tty); }
564 Monitor* owned_locks() const { return _owned_locks; }
565 bool owns_locks() const { return owned_locks() != NULL; }
566 bool owns_locks_but_compiled_lock() const;
568 // Deadlock detection
569 bool allow_allocation() { return _allow_allocation_count == 0; }
570 #endif
572 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
574 private:
575 volatile int _jvmti_env_iteration_count;
577 public:
578 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
579 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
580 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
582 // Code generation
583 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
584 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
585 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
587 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
588 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
590 #define TLAB_FIELD_OFFSET(name) \
591 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
593 TLAB_FIELD_OFFSET(start)
594 TLAB_FIELD_OFFSET(end)
595 TLAB_FIELD_OFFSET(top)
596 TLAB_FIELD_OFFSET(pf_top)
597 TLAB_FIELD_OFFSET(size) // desired_size
598 TLAB_FIELD_OFFSET(refill_waste_limit)
599 TLAB_FIELD_OFFSET(number_of_refills)
600 TLAB_FIELD_OFFSET(fast_refill_waste)
601 TLAB_FIELD_OFFSET(slow_allocations)
603 #undef TLAB_FIELD_OFFSET
605 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
607 public:
608 volatile intptr_t _Stalled ;
609 volatile int _TypeTag ;
610 ParkEvent * _ParkEvent ; // for synchronized()
611 ParkEvent * _SleepEvent ; // for Thread.sleep
612 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
613 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
614 int NativeSyncRecursion ; // diagnostic
616 volatile int _OnTrap ; // Resume-at IP delta
617 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
618 jint _hashStateX ; // thread-specific hashCode generator state
619 jint _hashStateY ;
620 jint _hashStateZ ;
621 void * _schedctl ;
623 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code
624 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); }
625 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); }
627 volatile jint rng [4] ; // RNG for spin loop
629 // Low-level leaf-lock primitives used to implement synchronization
630 // and native monitor-mutex infrastructure.
631 // Not for general synchronization use.
632 static void SpinAcquire (volatile int * Lock, const char * Name) ;
633 static void SpinRelease (volatile int * Lock) ;
634 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
635 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
636 static void muxRelease (volatile intptr_t * Lock) ;
637 };
639 // Inline implementation of Thread::current()
640 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
641 // startup.
642 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
643 // period. This is inlined in thread_<os_family>.inline.hpp.
645 inline Thread* Thread::current() {
646 #ifdef ASSERT
647 // This function is very high traffic. Define PARANOID to enable expensive
648 // asserts.
649 #ifdef PARANOID
650 // Signal handler should call ThreadLocalStorage::get_thread_slow()
651 Thread* t = ThreadLocalStorage::get_thread_slow();
652 assert(t != NULL && !t->is_inside_signal_handler(),
653 "Don't use Thread::current() inside signal handler");
654 #endif
655 #endif
656 Thread* thread = ThreadLocalStorage::thread();
657 assert(thread != NULL, "just checking");
658 return thread;
659 }
661 // Name support for threads. non-JavaThread subclasses with multiple
662 // uniquely named instances should derive from this.
663 class NamedThread: public Thread {
664 friend class VMStructs;
665 enum {
666 max_name_len = 64
667 };
668 private:
669 char* _name;
670 // log JavaThread being processed by oops_do
671 JavaThread* _processed_thread;
673 public:
674 NamedThread();
675 ~NamedThread();
676 // May only be called once per thread.
677 void set_name(const char* format, ...);
678 virtual bool is_Named_thread() const { return true; }
679 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
680 JavaThread *processed_thread() { return _processed_thread; }
681 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
682 };
684 // Worker threads are named and have an id of an assigned work.
685 class WorkerThread: public NamedThread {
686 private:
687 uint _id;
688 public:
689 WorkerThread() : _id(0) { }
690 virtual bool is_Worker_thread() const { return true; }
692 virtual WorkerThread* as_Worker_thread() const {
693 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
694 return (WorkerThread*) this;
695 }
697 void set_id(uint work_id) { _id = work_id; }
698 uint id() const { return _id; }
699 };
701 // A single WatcherThread is used for simulating timer interrupts.
702 class WatcherThread: public Thread {
703 friend class VMStructs;
704 public:
705 virtual void run();
707 private:
708 static WatcherThread* _watcher_thread;
710 volatile static bool _should_terminate; // updated without holding lock
711 public:
712 enum SomeConstants {
713 delay_interval = 10 // interrupt delay in milliseconds
714 };
716 // Constructor
717 WatcherThread();
719 // Tester
720 bool is_Watcher_thread() const { return true; }
722 // Printing
723 char* name() const { return (char*)"VM Periodic Task Thread"; }
724 void print_on(outputStream* st) const;
725 void print() const { print_on(tty); }
727 // Returns the single instance of WatcherThread
728 static WatcherThread* watcher_thread() { return _watcher_thread; }
730 // Create and start the single instance of WatcherThread, or stop it on shutdown
731 static void start();
732 static void stop();
733 };
736 class CompilerThread;
738 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
740 class JavaThread: public Thread {
741 friend class VMStructs;
742 private:
743 JavaThread* _next; // The next thread in the Threads list
744 oop _threadObj; // The Java level thread object
746 #ifdef ASSERT
747 private:
748 int _java_call_counter;
750 public:
751 int java_call_counter() { return _java_call_counter; }
752 void inc_java_call_counter() { _java_call_counter++; }
753 void dec_java_call_counter() {
754 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
755 _java_call_counter--;
756 }
757 private: // restore original namespace restriction
758 #endif // ifdef ASSERT
760 #ifndef PRODUCT
761 public:
762 enum {
763 jump_ring_buffer_size = 16
764 };
765 private: // restore original namespace restriction
766 #endif
768 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
770 ThreadFunction _entry_point;
772 JNIEnv _jni_environment;
774 // Deopt support
775 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
777 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
778 // transition out of native
779 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
780 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
781 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
782 // Because deoptimization is lazy we must save jvmti requests to set locals
783 // in compiled frames until we deoptimize and we have an interpreter frame.
784 // This holds the pointer to array (yeah like there might be more than one) of
785 // description of compiled vframes that have locals that need to be updated.
786 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
788 // Handshake value for fixing 6243940. We need a place for the i2c
789 // adapter to store the callee methodOop. This value is NEVER live
790 // across a gc point so it does NOT have to be gc'd
791 // The handshake is open ended since we can't be certain that it will
792 // be NULLed. This is because we rarely ever see the race and end up
793 // in handle_wrong_method which is the backend of the handshake. See
794 // code in i2c adapters and handle_wrong_method.
796 methodOop _callee_target;
798 // Oop results of VM runtime calls
799 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved
800 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved
802 // See ReduceInitialCardMarks: this holds the precise space interval of
803 // the most recent slow path allocation for which compiled code has
804 // elided card-marks for performance along the fast-path.
805 MemRegion _deferred_card_mark;
807 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
808 // allocated during deoptimization
809 // and by JNI_MonitorEnter/Exit
811 // Async. requests support
812 enum AsyncRequests {
813 _no_async_condition = 0,
814 _async_exception,
815 _async_unsafe_access_error
816 };
817 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
818 oop _pending_async_exception;
820 // Safepoint support
821 public: // Expose _thread_state for SafeFetchInt()
822 volatile JavaThreadState _thread_state;
823 private:
824 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
825 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
827 // JavaThread termination support
828 enum TerminatedTypes {
829 _not_terminated = 0xDEAD - 2,
830 _thread_exiting, // JavaThread::exit() has been called for this thread
831 _thread_terminated, // JavaThread is removed from thread list
832 _vm_exited // JavaThread is still executing native code, but VM is terminated
833 // only VM_Exit can set _vm_exited
834 };
836 // In general a JavaThread's _terminated field transitions as follows:
837 //
838 // _not_terminated => _thread_exiting => _thread_terminated
839 //
840 // _vm_exited is a special value to cover the case of a JavaThread
841 // executing native code after the VM itself is terminated.
842 volatile TerminatedTypes _terminated;
843 // suspend/resume support
844 volatile bool _suspend_equivalent; // Suspend equivalent condition
845 jint _in_deopt_handler; // count of deoptimization
846 // handlers thread is in
847 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
848 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
849 // never locked) when throwing an exception. Used by interpreter only.
851 // JNI attach states:
852 enum JNIAttachStates {
853 _not_attaching_via_jni = 1, // thread is not attaching via JNI
854 _attaching_via_jni, // thread is attaching via JNI
855 _attached_via_jni // thread has attached via JNI
856 };
858 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
859 // A native thread that is attaching via JNI starts with a value
860 // of _attaching_via_jni and transitions to _attached_via_jni.
861 volatile JNIAttachStates _jni_attach_state;
863 public:
864 // State of the stack guard pages for this thread.
865 enum StackGuardState {
866 stack_guard_unused, // not needed
867 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
868 stack_guard_enabled // enabled
869 };
871 private:
873 StackGuardState _stack_guard_state;
875 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
876 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
877 // code)
878 volatile oop _exception_oop; // Exception thrown in compiled code
879 volatile address _exception_pc; // PC where exception happened
880 volatile address _exception_handler_pc; // PC for handler of exception
881 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
883 // support for compilation
884 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
886 // support for JNI critical regions
887 jint _jni_active_critical; // count of entries into JNI critical region
889 // For deadlock detection.
890 int _depth_first_number;
892 // JVMTI PopFrame support
893 // This is set to popframe_pending to signal that top Java frame should be popped immediately
894 int _popframe_condition;
896 #ifndef PRODUCT
897 int _jmp_ring_index;
898 struct {
899 // We use intptr_t instead of address so debugger doesn't try and display strings
900 intptr_t _target;
901 intptr_t _instruction;
902 const char* _file;
903 int _line;
904 } _jmp_ring[ jump_ring_buffer_size ];
905 #endif /* PRODUCT */
907 #ifndef SERIALGC
908 // Support for G1 barriers
910 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
911 // Set of all such queues.
912 static SATBMarkQueueSet _satb_mark_queue_set;
914 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
915 // Set of all such queues.
916 static DirtyCardQueueSet _dirty_card_queue_set;
918 void flush_barrier_queues();
919 #endif // !SERIALGC
921 friend class VMThread;
922 friend class ThreadWaitTransition;
923 friend class VM_Exit;
925 void initialize(); // Initialized the instance variables
927 public:
928 // Constructor
929 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
930 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
931 ~JavaThread();
933 #ifdef ASSERT
934 // verify this JavaThread hasn't be published in the Threads::list yet
935 void verify_not_published();
936 #endif
938 //JNI functiontable getter/setter for JVMTI jni function table interception API.
939 void set_jni_functions(struct JNINativeInterface_* functionTable) {
940 _jni_environment.functions = functionTable;
941 }
942 struct JNINativeInterface_* get_jni_functions() {
943 return (struct JNINativeInterface_ *)_jni_environment.functions;
944 }
946 // This function is called at thread creation to allow
947 // platform specific thread variables to be initialized.
948 void cache_global_variables();
950 // Executes Shutdown.shutdown()
951 void invoke_shutdown_hooks();
953 // Cleanup on thread exit
954 enum ExitType {
955 normal_exit,
956 jni_detach
957 };
958 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
960 void cleanup_failed_attach_current_thread();
962 // Testers
963 virtual bool is_Java_thread() const { return true; }
965 // compilation
966 void set_is_compiling(bool f) { _is_compiling = f; }
967 bool is_compiling() const { return _is_compiling; }
969 // Thread chain operations
970 JavaThread* next() const { return _next; }
971 void set_next(JavaThread* p) { _next = p; }
973 // Thread oop. threadObj() can be NULL for initial JavaThread
974 // (or for threads attached via JNI)
975 oop threadObj() const { return _threadObj; }
976 void set_threadObj(oop p) { _threadObj = p; }
978 ThreadPriority java_priority() const; // Read from threadObj()
980 // Prepare thread and add to priority queue. If a priority is
981 // not specified, use the priority of the thread object. Threads_lock
982 // must be held while this function is called.
983 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
985 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
986 address saved_exception_pc() { return _saved_exception_pc; }
989 ThreadFunction entry_point() const { return _entry_point; }
991 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
992 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
994 // Last frame anchor routines
996 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
998 // last_Java_sp
999 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1000 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1002 // last_Java_pc
1004 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1006 // Safepoint support
1007 JavaThreadState thread_state() const { return _thread_state; }
1008 void set_thread_state(JavaThreadState s) { _thread_state=s; }
1009 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1010 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1011 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1013 // thread has called JavaThread::exit() or is terminated
1014 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1015 // thread is terminated (no longer on the threads list); we compare
1016 // against the two non-terminated values so that a freed JavaThread
1017 // will also be considered terminated.
1018 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1019 void set_terminated(TerminatedTypes t) { _terminated = t; }
1020 // special for Threads::remove() which is static:
1021 void set_terminated_value() { _terminated = _thread_terminated; }
1022 void block_if_vm_exited();
1024 bool doing_unsafe_access() { return _doing_unsafe_access; }
1025 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1027 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1028 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1031 // Suspend/resume support for JavaThread
1033 private:
1034 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1035 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1037 public:
1038 void java_suspend();
1039 void java_resume();
1040 int java_suspend_self();
1042 void check_and_wait_while_suspended() {
1043 assert(JavaThread::current() == this, "sanity check");
1045 bool do_self_suspend;
1046 do {
1047 // were we externally suspended while we were waiting?
1048 do_self_suspend = handle_special_suspend_equivalent_condition();
1049 if (do_self_suspend) {
1050 // don't surprise the thread that suspended us by returning
1051 java_suspend_self();
1052 set_suspend_equivalent();
1053 }
1054 } while (do_self_suspend);
1055 }
1056 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1057 // Check for async exception in addition to safepoint and suspend request.
1058 static void check_special_condition_for_native_trans(JavaThread *thread);
1060 // Same as check_special_condition_for_native_trans but finishes the
1061 // transition into thread_in_Java mode so that it can potentially
1062 // block.
1063 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1065 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1066 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1067 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1068 // Warning: is_ext_suspend_completed() may temporarily drop the
1069 // SR_lock to allow the thread to reach a stable thread state if
1070 // it is currently in a transient thread state.
1071 return is_ext_suspend_completed(false /*!called_by_wait */,
1072 SuspendRetryDelay, bits);
1073 }
1075 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1076 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1077 // passed as the count and delay parameters. Experiments with specific
1078 // calls to wait_for_ext_suspend_completion() can be done by passing
1079 // other values in the code. Experiments with all calls can be done
1080 // via the appropriate -XX options.
1081 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1083 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1084 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1086 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1087 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1088 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1090 bool is_external_suspend() const {
1091 return (_suspend_flags & _external_suspend) != 0;
1092 }
1093 // Whenever a thread transitions from native to vm/java it must suspend
1094 // if external|deopt suspend is present.
1095 bool is_suspend_after_native() const {
1096 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1097 }
1099 // external suspend request is completed
1100 bool is_ext_suspended() const {
1101 return (_suspend_flags & _ext_suspended) != 0;
1102 }
1104 bool is_external_suspend_with_lock() const {
1105 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1106 return is_external_suspend();
1107 }
1109 // Special method to handle a pending external suspend request
1110 // when a suspend equivalent condition lifts.
1111 bool handle_special_suspend_equivalent_condition() {
1112 assert(is_suspend_equivalent(),
1113 "should only be called in a suspend equivalence condition");
1114 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1115 bool ret = is_external_suspend();
1116 if (!ret) {
1117 // not about to self-suspend so clear suspend equivalence
1118 clear_suspend_equivalent();
1119 }
1120 // implied else:
1121 // We have a pending external suspend request so we leave the
1122 // suspend_equivalent flag set until java_suspend_self() sets
1123 // the ext_suspended flag and clears the suspend_equivalent
1124 // flag. This insures that wait_for_ext_suspend_completion()
1125 // will return consistent values.
1126 return ret;
1127 }
1129 // utility methods to see if we are doing some kind of suspension
1130 bool is_being_ext_suspended() const {
1131 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1132 return is_ext_suspended() || is_external_suspend();
1133 }
1135 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1137 void set_suspend_equivalent() { _suspend_equivalent = true; };
1138 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1140 // Thread.stop support
1141 void send_thread_stop(oop throwable);
1142 AsyncRequests clear_special_runtime_exit_condition() {
1143 AsyncRequests x = _special_runtime_exit_condition;
1144 _special_runtime_exit_condition = _no_async_condition;
1145 return x;
1146 }
1148 // Are any async conditions present?
1149 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1151 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1153 // these next two are also used for self-suspension and async exception support
1154 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1156 // Return true if JavaThread has an asynchronous condition or
1157 // if external suspension is requested.
1158 bool has_special_runtime_exit_condition() {
1159 // We call is_external_suspend() last since external suspend should
1160 // be less common. Because we don't use is_external_suspend_with_lock
1161 // it is possible that we won't see an asynchronous external suspend
1162 // request that has just gotten started, i.e., SR_lock grabbed but
1163 // _external_suspend field change either not made yet or not visible
1164 // yet. However, this is okay because the request is asynchronous and
1165 // we will see the new flag value the next time through. It's also
1166 // possible that the external suspend request is dropped after
1167 // we have checked is_external_suspend(), we will recheck its value
1168 // under SR_lock in java_suspend_self().
1169 return (_special_runtime_exit_condition != _no_async_condition) ||
1170 is_external_suspend() || is_deopt_suspend();
1171 }
1173 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1175 void set_pending_async_exception(oop e) {
1176 _pending_async_exception = e;
1177 _special_runtime_exit_condition = _async_exception;
1178 set_has_async_exception();
1179 }
1181 // Fast-locking support
1182 bool is_lock_owned(address adr) const;
1184 // Accessors for vframe array top
1185 // The linked list of vframe arrays are sorted on sp. This means when we
1186 // unpack the head must contain the vframe array to unpack.
1187 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1188 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1190 // Side structure for defering update of java frame locals until deopt occurs
1191 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1192 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1194 // These only really exist to make debugging deopt problems simpler
1196 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1197 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1199 // The special resourceMark used during deoptimization
1201 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1202 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1204 intptr_t* must_deopt_id() { return _must_deopt_id; }
1205 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1206 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1208 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1209 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1211 methodOop callee_target() const { return _callee_target; }
1212 void set_callee_target (methodOop x) { _callee_target = x; }
1214 // Oop results of vm runtime calls
1215 oop vm_result() const { return _vm_result; }
1216 void set_vm_result (oop x) { _vm_result = x; }
1218 oop vm_result_2() const { return _vm_result_2; }
1219 void set_vm_result_2 (oop x) { _vm_result_2 = x; }
1221 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1222 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1224 // Exception handling for compiled methods
1225 oop exception_oop() const { return _exception_oop; }
1226 address exception_pc() const { return _exception_pc; }
1227 address exception_handler_pc() const { return _exception_handler_pc; }
1228 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1230 void set_exception_oop(oop o) { _exception_oop = o; }
1231 void set_exception_pc(address a) { _exception_pc = a; }
1232 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1233 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1235 // Stack overflow support
1236 inline size_t stack_available(address cur_sp);
1237 address stack_yellow_zone_base()
1238 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1239 size_t stack_yellow_zone_size()
1240 { return StackYellowPages * os::vm_page_size(); }
1241 address stack_red_zone_base()
1242 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1243 size_t stack_red_zone_size()
1244 { return StackRedPages * os::vm_page_size(); }
1245 bool in_stack_yellow_zone(address a)
1246 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1247 bool in_stack_red_zone(address a)
1248 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1250 void create_stack_guard_pages();
1251 void remove_stack_guard_pages();
1253 void enable_stack_yellow_zone();
1254 void disable_stack_yellow_zone();
1255 void enable_stack_red_zone();
1256 void disable_stack_red_zone();
1258 inline bool stack_yellow_zone_disabled();
1259 inline bool stack_yellow_zone_enabled();
1261 // Attempt to reguard the stack after a stack overflow may have occurred.
1262 // Returns true if (a) guard pages are not needed on this thread, (b) the
1263 // pages are already guarded, or (c) the pages were successfully reguarded.
1264 // Returns false if there is not enough stack space to reguard the pages, in
1265 // which case the caller should unwind a frame and try again. The argument
1266 // should be the caller's (approximate) sp.
1267 bool reguard_stack(address cur_sp);
1268 // Similar to above but see if current stackpoint is out of the guard area
1269 // and reguard if possible.
1270 bool reguard_stack(void);
1272 // Misc. accessors/mutators
1273 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1274 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1275 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1277 #ifndef PRODUCT
1278 void record_jump(address target, address instr, const char* file, int line);
1279 #endif /* PRODUCT */
1281 // For assembly stub generation
1282 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1283 #ifndef PRODUCT
1284 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1285 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1286 #endif /* PRODUCT */
1287 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1288 static ByteSize last_Java_sp_offset() {
1289 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1290 }
1291 static ByteSize last_Java_pc_offset() {
1292 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1293 }
1294 static ByteSize frame_anchor_offset() {
1295 return byte_offset_of(JavaThread, _anchor);
1296 }
1297 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1298 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1299 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1300 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1301 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1302 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1303 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1304 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1305 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1306 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1307 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1308 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1310 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1311 static ByteSize should_post_on_exceptions_flag_offset() {
1312 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1313 }
1315 #ifndef SERIALGC
1316 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1317 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1318 #endif // !SERIALGC
1320 // Returns the jni environment for this thread
1321 JNIEnv* jni_environment() { return &_jni_environment; }
1323 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1324 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1325 // Only return NULL if thread is off the thread list; starting to
1326 // exit should not return NULL.
1327 if (thread_from_jni_env->is_terminated()) {
1328 thread_from_jni_env->block_if_vm_exited();
1329 return NULL;
1330 } else {
1331 return thread_from_jni_env;
1332 }
1333 }
1335 // JNI critical regions. These can nest.
1336 bool in_critical() { return _jni_active_critical > 0; }
1337 bool in_last_critical() { return _jni_active_critical == 1; }
1338 void enter_critical() { assert(Thread::current() == this ||
1339 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1340 "this must be current thread or synchronizing");
1341 _jni_active_critical++; }
1342 void exit_critical() { assert(Thread::current() == this,
1343 "this must be current thread");
1344 _jni_active_critical--;
1345 assert(_jni_active_critical >= 0,
1346 "JNI critical nesting problem?"); }
1348 // For deadlock detection
1349 int depth_first_number() { return _depth_first_number; }
1350 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1352 private:
1353 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1355 public:
1356 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1357 void add_monitor_chunk(MonitorChunk* chunk);
1358 void remove_monitor_chunk(MonitorChunk* chunk);
1359 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1360 void inc_in_deopt_handler() { _in_deopt_handler++; }
1361 void dec_in_deopt_handler() {
1362 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1363 if (_in_deopt_handler > 0) { // robustness
1364 _in_deopt_handler--;
1365 }
1366 }
1368 private:
1369 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1371 public:
1373 // Frame iteration; calls the function f for all frames on the stack
1374 void frames_do(void f(frame*, const RegisterMap*));
1376 // Memory operations
1377 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1379 // Sweeper operations
1380 void nmethods_do(CodeBlobClosure* cf);
1382 // Memory management operations
1383 void gc_epilogue();
1384 void gc_prologue();
1386 // Misc. operations
1387 char* name() const { return (char*)get_thread_name(); }
1388 void print_on(outputStream* st) const;
1389 void print() const { print_on(tty); }
1390 void print_value();
1391 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1392 void print_thread_state() const PRODUCT_RETURN;
1393 void print_on_error(outputStream* st, char* buf, int buflen) const;
1394 void verify();
1395 const char* get_thread_name() const;
1396 private:
1397 // factor out low-level mechanics for use in both normal and error cases
1398 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1399 public:
1400 const char* get_threadgroup_name() const;
1401 const char* get_parent_name() const;
1403 // Accessing frames
1404 frame last_frame() {
1405 _anchor.make_walkable(this);
1406 return pd_last_frame();
1407 }
1408 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1410 // Returns method at 'depth' java or native frames down the stack
1411 // Used for security checks
1412 klassOop security_get_caller_class(int depth);
1414 // Print stack trace in external format
1415 void print_stack_on(outputStream* st);
1416 void print_stack() { print_stack_on(tty); }
1418 // Print stack traces in various internal formats
1419 void trace_stack() PRODUCT_RETURN;
1420 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1421 void trace_frames() PRODUCT_RETURN;
1422 void trace_oops() PRODUCT_RETURN;
1424 // Print an annotated view of the stack frames
1425 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1426 void validate_frame_layout() {
1427 print_frame_layout(0, true);
1428 }
1430 // Returns the number of stack frames on the stack
1431 int depth() const;
1433 // Function for testing deoptimization
1434 void deoptimize();
1435 void make_zombies();
1437 void deoptimized_wrt_marked_nmethods();
1439 // Profiling operation (see fprofile.cpp)
1440 public:
1441 bool profile_last_Java_frame(frame* fr);
1443 private:
1444 ThreadProfiler* _thread_profiler;
1445 private:
1446 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1447 friend class FlatProfilerTask; // uses get_thread_profiler.
1448 friend class ThreadProfilerMark; // uses get_thread_profiler.
1449 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1450 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1451 ThreadProfiler* result = _thread_profiler;
1452 _thread_profiler = tp;
1453 return result;
1454 }
1456 // Static operations
1457 public:
1458 // Returns the running thread as a JavaThread
1459 static inline JavaThread* current();
1461 // Returns the active Java thread. Do not use this if you know you are calling
1462 // from a JavaThread, as it's slower than JavaThread::current. If called from
1463 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1464 // operation. You may not want that either.
1465 static JavaThread* active();
1467 inline CompilerThread* as_CompilerThread();
1469 public:
1470 virtual void run();
1471 void thread_main_inner();
1473 private:
1474 // PRIVILEGED STACK
1475 PrivilegedElement* _privileged_stack_top;
1476 GrowableArray<oop>* _array_for_gc;
1477 public:
1479 // Returns the privileged_stack information.
1480 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1481 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1482 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1484 public:
1485 // Thread local information maintained by JVMTI.
1486 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1487 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1488 // getter is used to get this JavaThread's JvmtiThreadState if it has
1489 // one which means NULL can be returned. JvmtiThreadState::state_for()
1490 // is used to get the specified JavaThread's JvmtiThreadState if it has
1491 // one or it allocates a new JvmtiThreadState for the JavaThread and
1492 // returns it. JvmtiThreadState::state_for() will return NULL only if
1493 // the specified JavaThread is exiting.
1494 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1495 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1496 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1497 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1499 // JVMTI PopFrame support
1500 // Setting and clearing popframe_condition
1501 // All of these enumerated values are bits. popframe_pending
1502 // indicates that a PopFrame() has been requested and not yet been
1503 // completed. popframe_processing indicates that that PopFrame() is in
1504 // the process of being completed. popframe_force_deopt_reexecution_bit
1505 // indicates that special handling is required when returning to a
1506 // deoptimized caller.
1507 enum PopCondition {
1508 popframe_inactive = 0x00,
1509 popframe_pending_bit = 0x01,
1510 popframe_processing_bit = 0x02,
1511 popframe_force_deopt_reexecution_bit = 0x04
1512 };
1513 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1514 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1515 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1516 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1517 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1518 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1519 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1520 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1521 #ifdef CC_INTERP
1522 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1523 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1524 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1525 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1526 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1527 #endif
1529 private:
1530 // Saved incoming arguments to popped frame.
1531 // Used only when popped interpreted frame returns to deoptimized frame.
1532 void* _popframe_preserved_args;
1533 int _popframe_preserved_args_size;
1535 public:
1536 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1537 void* popframe_preserved_args();
1538 ByteSize popframe_preserved_args_size();
1539 WordSize popframe_preserved_args_size_in_words();
1540 void popframe_free_preserved_args();
1543 private:
1544 JvmtiThreadState *_jvmti_thread_state;
1545 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1547 // Used by the interpreter in fullspeed mode for frame pop, method
1548 // entry, method exit and single stepping support. This field is
1549 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1550 // It can be set to zero asynchronously (i.e., without a VM operation
1551 // or a lock) so we have to be very careful.
1552 int _interp_only_mode;
1554 public:
1555 // used by the interpreter for fullspeed debugging support (see above)
1556 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1557 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1558 int get_interp_only_mode() { return _interp_only_mode; }
1559 void increment_interp_only_mode() { ++_interp_only_mode; }
1560 void decrement_interp_only_mode() { --_interp_only_mode; }
1562 // support for cached flag that indicates whether exceptions need to be posted for this thread
1563 // if this is false, we can avoid deoptimizing when events are thrown
1564 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1565 private:
1566 int _should_post_on_exceptions_flag;
1568 public:
1569 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1570 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1572 private:
1573 ThreadStatistics *_thread_stat;
1575 public:
1576 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1578 // Return a blocker object for which this thread is blocked parking.
1579 oop current_park_blocker();
1581 private:
1582 static size_t _stack_size_at_create;
1584 public:
1585 static inline size_t stack_size_at_create(void) {
1586 return _stack_size_at_create;
1587 }
1588 static inline void set_stack_size_at_create(size_t value) {
1589 _stack_size_at_create = value;
1590 }
1592 #ifndef SERIALGC
1593 // SATB marking queue support
1594 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1595 static SATBMarkQueueSet& satb_mark_queue_set() {
1596 return _satb_mark_queue_set;
1597 }
1599 // Dirty card queue support
1600 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1601 static DirtyCardQueueSet& dirty_card_queue_set() {
1602 return _dirty_card_queue_set;
1603 }
1604 #endif // !SERIALGC
1606 // This method initializes the SATB and dirty card queues before a
1607 // JavaThread is added to the Java thread list. Right now, we don't
1608 // have to do anything to the dirty card queue (it should have been
1609 // activated when the thread was created), but we have to activate
1610 // the SATB queue if the thread is created while a marking cycle is
1611 // in progress. The activation / de-activation of the SATB queues at
1612 // the beginning / end of a marking cycle is done during safepoints
1613 // so we have to make sure this method is called outside one to be
1614 // able to safely read the active field of the SATB queue set. Right
1615 // now, it is called just before the thread is added to the Java
1616 // thread list in the Threads::add() method. That method is holding
1617 // the Threads_lock which ensures we are outside a safepoint. We
1618 // cannot do the obvious and set the active field of the SATB queue
1619 // when the thread is created given that, in some cases, safepoints
1620 // might happen between the JavaThread constructor being called and the
1621 // thread being added to the Java thread list (an example of this is
1622 // when the structure for the DestroyJavaVM thread is created).
1623 #ifndef SERIALGC
1624 void initialize_queues();
1625 #else // !SERIALGC
1626 void initialize_queues() { }
1627 #endif // !SERIALGC
1629 // Machine dependent stuff
1630 #ifdef TARGET_OS_ARCH_linux_x86
1631 # include "thread_linux_x86.hpp"
1632 #endif
1633 #ifdef TARGET_OS_ARCH_linux_sparc
1634 # include "thread_linux_sparc.hpp"
1635 #endif
1636 #ifdef TARGET_OS_ARCH_linux_zero
1637 # include "thread_linux_zero.hpp"
1638 #endif
1639 #ifdef TARGET_OS_ARCH_solaris_x86
1640 # include "thread_solaris_x86.hpp"
1641 #endif
1642 #ifdef TARGET_OS_ARCH_solaris_sparc
1643 # include "thread_solaris_sparc.hpp"
1644 #endif
1645 #ifdef TARGET_OS_ARCH_windows_x86
1646 # include "thread_windows_x86.hpp"
1647 #endif
1648 #ifdef TARGET_OS_ARCH_linux_arm
1649 # include "thread_linux_arm.hpp"
1650 #endif
1651 #ifdef TARGET_OS_ARCH_linux_ppc
1652 # include "thread_linux_ppc.hpp"
1653 #endif
1654 #ifdef TARGET_OS_ARCH_bsd_x86
1655 # include "thread_bsd_x86.hpp"
1656 #endif
1657 #ifdef TARGET_OS_ARCH_bsd_zero
1658 # include "thread_bsd_zero.hpp"
1659 #endif
1662 public:
1663 void set_blocked_on_compilation(bool value) {
1664 _blocked_on_compilation = value;
1665 }
1667 bool blocked_on_compilation() {
1668 return _blocked_on_compilation;
1669 }
1670 protected:
1671 bool _blocked_on_compilation;
1674 // JSR166 per-thread parker
1675 private:
1676 Parker* _parker;
1677 public:
1678 Parker* parker() { return _parker; }
1680 // Biased locking support
1681 private:
1682 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1683 public:
1684 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1685 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1687 // clearing/querying jni attach status
1688 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1689 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1690 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); }
1691 private:
1692 // This field is used to determine if a thread has claimed
1693 // a par_id: it is -1 if the thread has not claimed a par_id;
1694 // otherwise its value is the par_id that has been claimed.
1695 int _claimed_par_id;
1696 public:
1697 int get_claimed_par_id() { return _claimed_par_id; }
1698 void set_claimed_par_id(int id) { _claimed_par_id = id;}
1699 };
1701 // Inline implementation of JavaThread::current
1702 inline JavaThread* JavaThread::current() {
1703 Thread* thread = ThreadLocalStorage::thread();
1704 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1705 return (JavaThread*)thread;
1706 }
1708 inline CompilerThread* JavaThread::as_CompilerThread() {
1709 assert(is_Compiler_thread(), "just checking");
1710 return (CompilerThread*)this;
1711 }
1713 inline bool JavaThread::stack_yellow_zone_disabled() {
1714 return _stack_guard_state == stack_guard_yellow_disabled;
1715 }
1717 inline bool JavaThread::stack_yellow_zone_enabled() {
1718 #ifdef ASSERT
1719 if (os::uses_stack_guard_pages()) {
1720 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1721 }
1722 #endif
1723 return _stack_guard_state == stack_guard_enabled;
1724 }
1726 inline size_t JavaThread::stack_available(address cur_sp) {
1727 // This code assumes java stacks grow down
1728 address low_addr; // Limit on the address for deepest stack depth
1729 if ( _stack_guard_state == stack_guard_unused) {
1730 low_addr = stack_base() - stack_size();
1731 } else {
1732 low_addr = stack_yellow_zone_base();
1733 }
1734 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1735 }
1737 // A thread used for Compilation.
1738 class CompilerThread : public JavaThread {
1739 friend class VMStructs;
1740 private:
1741 CompilerCounters* _counters;
1743 ciEnv* _env;
1744 CompileLog* _log;
1745 CompileTask* _task;
1746 CompileQueue* _queue;
1747 BufferBlob* _buffer_blob;
1749 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1751 public:
1753 static CompilerThread* current();
1755 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1757 bool is_Compiler_thread() const { return true; }
1758 // Hide this compiler thread from external view.
1759 bool is_hidden_from_external_view() const { return true; }
1761 CompileQueue* queue() { return _queue; }
1762 CompilerCounters* counters() { return _counters; }
1764 // Get/set the thread's compilation environment.
1765 ciEnv* env() { return _env; }
1766 void set_env(ciEnv* env) { _env = env; }
1768 BufferBlob* get_buffer_blob() { return _buffer_blob; }
1769 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1771 // Get/set the thread's logging information
1772 CompileLog* log() { return _log; }
1773 void init_log(CompileLog* log) {
1774 // Set once, for good.
1775 assert(_log == NULL, "set only once");
1776 _log = log;
1777 }
1779 // GC support
1780 // Apply "f->do_oop" to all root oops in "this".
1781 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1782 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1784 #ifndef PRODUCT
1785 private:
1786 IdealGraphPrinter *_ideal_graph_printer;
1787 public:
1788 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1789 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1790 #endif
1792 // Get/set the thread's current task
1793 CompileTask* task() { return _task; }
1794 void set_task(CompileTask* task) { _task = task; }
1796 // Track the nmethod currently being scanned by the sweeper
1797 void set_scanned_nmethod(nmethod* nm) {
1798 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1799 _scanned_nmethod = nm;
1800 }
1801 };
1803 inline CompilerThread* CompilerThread::current() {
1804 return JavaThread::current()->as_CompilerThread();
1805 }
1808 // The active thread queue. It also keeps track of the current used
1809 // thread priorities.
1810 class Threads: AllStatic {
1811 friend class VMStructs;
1812 private:
1813 static JavaThread* _thread_list;
1814 static int _number_of_threads;
1815 static int _number_of_non_daemon_threads;
1816 static int _return_code;
1818 public:
1819 // Thread management
1820 // force_daemon is a concession to JNI, where we may need to add a
1821 // thread to the thread list before allocating its thread object
1822 static void add(JavaThread* p, bool force_daemon = false);
1823 static void remove(JavaThread* p);
1824 static bool includes(JavaThread* p);
1825 static JavaThread* first() { return _thread_list; }
1826 static void threads_do(ThreadClosure* tc);
1828 // Initializes the vm and creates the vm thread
1829 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1830 static void convert_vm_init_libraries_to_agents();
1831 static void create_vm_init_libraries();
1832 static void create_vm_init_agents();
1833 static void shutdown_vm_agents();
1834 static bool destroy_vm();
1835 // Supported VM versions via JNI
1836 // Includes JNI_VERSION_1_1
1837 static jboolean is_supported_jni_version_including_1_1(jint version);
1838 // Does not include JNI_VERSION_1_1
1839 static jboolean is_supported_jni_version(jint version);
1841 // Garbage collection
1842 static void follow_other_roots(void f(oop*));
1844 // Apply "f->do_oop" to all root oops in all threads.
1845 // This version may only be called by sequential code.
1846 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
1847 // This version may be called by sequential or parallel code.
1848 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf);
1849 // This creates a list of GCTasks, one per thread.
1850 static void create_thread_roots_tasks(GCTaskQueue* q);
1851 // This creates a list of GCTasks, one per thread, for marking objects.
1852 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1854 // Apply "f->do_oop" to roots in all threads that
1855 // are part of compiled frames
1856 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1858 static void convert_hcode_pointers();
1859 static void restore_hcode_pointers();
1861 // Sweeper
1862 static void nmethods_do(CodeBlobClosure* cf);
1864 static void gc_epilogue();
1865 static void gc_prologue();
1867 // Verification
1868 static void verify();
1869 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1870 static void print(bool print_stacks, bool internal_format) {
1871 // this function is only used by debug.cpp
1872 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1873 }
1874 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1876 // Get Java threads that are waiting to enter a monitor. If doLock
1877 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1878 // VM needs to be at a safepoint.
1879 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1880 address monitor, bool doLock);
1882 // Get owning Java thread from the monitor's owner field. If doLock
1883 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1884 // VM needs to be at a safepoint.
1885 static JavaThread *owning_thread_from_monitor_owner(address owner,
1886 bool doLock);
1888 // Number of threads on the active threads list
1889 static int number_of_threads() { return _number_of_threads; }
1890 // Number of non-daemon threads on the active threads list
1891 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1893 // Deoptimizes all frames tied to marked nmethods
1894 static void deoptimized_wrt_marked_nmethods();
1896 };
1899 // Thread iterator
1900 class ThreadClosure: public StackObj {
1901 public:
1902 virtual void do_thread(Thread* thread) = 0;
1903 };
1905 class SignalHandlerMark: public StackObj {
1906 private:
1907 Thread* _thread;
1908 public:
1909 SignalHandlerMark(Thread* t) {
1910 _thread = t;
1911 if (_thread) _thread->enter_signal_handler();
1912 }
1913 ~SignalHandlerMark() {
1914 if (_thread) _thread->leave_signal_handler();
1915 _thread = NULL;
1916 }
1917 };
1920 #endif // SHARE_VM_RUNTIME_THREAD_HPP