Wed, 11 Jan 2012 17:34:02 -0500
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
Summary: Added a nop tracing infrastructure, JFR makefile changes and other infrastructure used only by JFR.
Reviewed-by: acorn, sspitsyn
Contributed-by: markus.gronlund@oracle.com
1 /*
2 * Copyright (c) 1997, 2011, 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 };
188 // various suspension related flags - atomically updated
189 // overloaded for async exception checking in check_special_condition_for_native_trans.
190 volatile uint32_t _suspend_flags;
192 private:
193 int _num_nested_signal;
195 public:
196 void enter_signal_handler() { _num_nested_signal++; }
197 void leave_signal_handler() { _num_nested_signal--; }
198 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
200 private:
201 // Debug tracing
202 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
204 // Active_handles points to a block of handles
205 JNIHandleBlock* _active_handles;
207 // One-element thread local free list
208 JNIHandleBlock* _free_handle_block;
210 // Point to the last handle mark
211 HandleMark* _last_handle_mark;
213 // The parity of the last strong_roots iteration in which this thread was
214 // claimed as a task.
215 jint _oops_do_parity;
217 public:
218 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
219 HandleMark* last_handle_mark() const { return _last_handle_mark; }
220 private:
222 // debug support for checking if code does allow safepoints or not
223 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
224 // mutex, or blocking on an object synchronizer (Java locking).
225 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
226 // If !allow_allocation(), then an assertion failure will happen during allocation
227 // (Hence, !allow_safepoint() => !allow_allocation()).
228 //
229 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
230 //
231 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
232 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
234 // Used by SkipGCALot class.
235 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
237 // Record when GC is locked out via the GC_locker mechanism
238 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
240 friend class No_Alloc_Verifier;
241 friend class No_Safepoint_Verifier;
242 friend class Pause_No_Safepoint_Verifier;
243 friend class ThreadLocalStorage;
244 friend class GC_locker;
246 ThreadLocalAllocBuffer _tlab; // Thread-local eden
247 jlong _allocated_bytes; // Cumulative number of bytes allocated on
248 // the Java heap
250 TRACE_BUFFER _trace_buffer; // Thread-local buffer for tracing
252 int _vm_operation_started_count; // VM_Operation support
253 int _vm_operation_completed_count; // VM_Operation support
255 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
256 // is waiting to lock
257 bool _current_pending_monitor_is_from_java; // locking is from Java code
259 // ObjectMonitor on which this thread called Object.wait()
260 ObjectMonitor* _current_waiting_monitor;
262 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
263 public:
264 ObjectMonitor* omFreeList;
265 int omFreeCount; // length of omFreeList
266 int omFreeProvision; // reload chunk size
267 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
268 int omInUseCount; // length of omInUseList
270 public:
271 enum {
272 is_definitely_current_thread = true
273 };
275 // Constructor
276 Thread();
277 virtual ~Thread();
279 // initializtion
280 void initialize_thread_local_storage();
282 // thread entry point
283 virtual void run();
285 // Testers
286 virtual bool is_VM_thread() const { return false; }
287 virtual bool is_Java_thread() const { return false; }
288 virtual bool is_Compiler_thread() const { return false; }
289 virtual bool is_hidden_from_external_view() const { return false; }
290 virtual bool is_jvmti_agent_thread() const { return false; }
291 // True iff the thread can perform GC operations at a safepoint.
292 // Generally will be true only of VM thread and parallel GC WorkGang
293 // threads.
294 virtual bool is_GC_task_thread() const { return false; }
295 virtual bool is_Watcher_thread() const { return false; }
296 virtual bool is_ConcurrentGC_thread() const { return false; }
297 virtual bool is_Named_thread() const { return false; }
298 virtual bool is_Worker_thread() const { return false; }
300 // Casts
301 virtual WorkerThread* as_Worker_thread() const { return NULL; }
303 virtual char* name() const { return (char*)"Unknown thread"; }
305 // Returns the current thread
306 static inline Thread* current();
308 // Common thread operations
309 static void set_priority(Thread* thread, ThreadPriority priority);
310 static ThreadPriority get_priority(const Thread* const thread);
311 static void start(Thread* thread);
312 static void interrupt(Thread* thr);
313 static bool is_interrupted(Thread* thr, bool clear_interrupted);
315 void set_native_thread_name(const char *name) {
316 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
317 os::set_native_thread_name(name);
318 }
320 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
321 Monitor* SR_lock() const { return _SR_lock; }
323 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
325 void set_suspend_flag(SuspendFlags f) {
326 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
327 uint32_t flags;
328 do {
329 flags = _suspend_flags;
330 }
331 while (Atomic::cmpxchg((jint)(flags | f),
332 (volatile jint*)&_suspend_flags,
333 (jint)flags) != (jint)flags);
334 }
335 void clear_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 }
346 void set_has_async_exception() {
347 set_suspend_flag(_has_async_exception);
348 }
349 void clear_has_async_exception() {
350 clear_suspend_flag(_has_async_exception);
351 }
353 // Support for Unhandled Oop detection
354 #ifdef CHECK_UNHANDLED_OOPS
355 private:
356 UnhandledOops* _unhandled_oops;
357 public:
358 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
359 // Mark oop safe for gc. It may be stack allocated but won't move.
360 void allow_unhandled_oop(oop *op) {
361 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
362 }
363 // Clear oops at safepoint so crashes point to unhandled oop violator
364 void clear_unhandled_oops() {
365 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
366 }
367 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
368 #endif // CHECK_UNHANDLED_OOPS
370 #ifndef PRODUCT
371 bool skip_gcalot() { return _skip_gcalot; }
372 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
373 #endif
375 public:
376 // Installs a pending exception to be inserted later
377 static void send_async_exception(oop thread_oop, oop java_throwable);
379 // Resource area
380 ResourceArea* resource_area() const { return _resource_area; }
381 void set_resource_area(ResourceArea* area) { _resource_area = area; }
383 OSThread* osthread() const { return _osthread; }
384 void set_osthread(OSThread* thread) { _osthread = thread; }
386 // JNI handle support
387 JNIHandleBlock* active_handles() const { return _active_handles; }
388 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
389 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
390 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
392 // Internal handle support
393 HandleArea* handle_area() const { return _handle_area; }
394 void set_handle_area(HandleArea* area) { _handle_area = area; }
396 // Thread-Local Allocation Buffer (TLAB) support
397 ThreadLocalAllocBuffer& tlab() { return _tlab; }
398 void initialize_tlab() {
399 if (UseTLAB) {
400 tlab().initialize();
401 }
402 }
404 jlong allocated_bytes() { return _allocated_bytes; }
405 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
406 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
407 jlong cooked_allocated_bytes() {
408 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
409 if (UseTLAB) {
410 size_t used_bytes = tlab().used_bytes();
411 if ((ssize_t)used_bytes > 0) {
412 // More-or-less valid tlab. The load_acquire above should ensure
413 // that the result of the add is <= the instantaneous value
414 return allocated_bytes + used_bytes;
415 }
416 }
417 return allocated_bytes;
418 }
420 TRACE_BUFFER trace_buffer() { return _trace_buffer; }
421 void set_trace_buffer(TRACE_BUFFER buf) { _trace_buffer = buf; }
423 // VM operation support
424 int vm_operation_ticket() { return ++_vm_operation_started_count; }
425 int vm_operation_completed_count() { return _vm_operation_completed_count; }
426 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
428 // For tracking the heavyweight monitor the thread is pending on.
429 ObjectMonitor* current_pending_monitor() {
430 return _current_pending_monitor;
431 }
432 void set_current_pending_monitor(ObjectMonitor* monitor) {
433 _current_pending_monitor = monitor;
434 }
435 void set_current_pending_monitor_is_from_java(bool from_java) {
436 _current_pending_monitor_is_from_java = from_java;
437 }
438 bool current_pending_monitor_is_from_java() {
439 return _current_pending_monitor_is_from_java;
440 }
442 // For tracking the ObjectMonitor on which this thread called Object.wait()
443 ObjectMonitor* current_waiting_monitor() {
444 return _current_waiting_monitor;
445 }
446 void set_current_waiting_monitor(ObjectMonitor* monitor) {
447 _current_waiting_monitor = monitor;
448 }
450 // GC support
451 // Apply "f->do_oop" to all root oops in "this".
452 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
453 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf);
455 // Handles the parallel case for the method below.
456 private:
457 bool claim_oops_do_par_case(int collection_parity);
458 public:
459 // Requires that "collection_parity" is that of the current strong roots
460 // iteration. If "is_par" is false, sets the parity of "this" to
461 // "collection_parity", and returns "true". If "is_par" is true,
462 // uses an atomic instruction to set the current threads parity to
463 // "collection_parity", if it is not already. Returns "true" iff the
464 // calling thread does the update, this indicates that the calling thread
465 // has claimed the thread's stack as a root groop in the current
466 // collection.
467 bool claim_oops_do(bool is_par, int collection_parity) {
468 if (!is_par) {
469 _oops_do_parity = collection_parity;
470 return true;
471 } else {
472 return claim_oops_do_par_case(collection_parity);
473 }
474 }
476 // Sweeper support
477 void nmethods_do(CodeBlobClosure* cf);
479 // Used by fast lock support
480 virtual bool is_lock_owned(address adr) const;
482 // Check if address is in the stack of the thread (not just for locks).
483 // Warning: the method can only be used on the running thread
484 bool is_in_stack(address adr) const;
486 // Sets this thread as starting thread. Returns failure if thread
487 // creation fails due to lack of memory, too many threads etc.
488 bool set_as_starting_thread();
490 protected:
491 // OS data associated with the thread
492 OSThread* _osthread; // Platform-specific thread information
494 // Thread local resource area for temporary allocation within the VM
495 ResourceArea* _resource_area;
497 // Thread local handle area for allocation of handles within the VM
498 HandleArea* _handle_area;
500 // Support for stack overflow handling, get_thread, etc.
501 address _stack_base;
502 size_t _stack_size;
503 uintptr_t _self_raw_id; // used by get_thread (mutable)
504 int _lgrp_id;
506 public:
507 // Stack overflow support
508 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
510 void set_stack_base(address base) { _stack_base = base; }
511 size_t stack_size() const { return _stack_size; }
512 void set_stack_size(size_t size) { _stack_size = size; }
513 void record_stack_base_and_size();
515 bool on_local_stack(address adr) const {
516 /* QQQ this has knowledge of direction, ought to be a stack method */
517 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
518 }
520 uintptr_t self_raw_id() { return _self_raw_id; }
521 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
523 int lgrp_id() const { return _lgrp_id; }
524 void set_lgrp_id(int value) { _lgrp_id = value; }
526 // Printing
527 void print_on(outputStream* st) const;
528 void print() const { print_on(tty); }
529 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
531 // Debug-only code
533 #ifdef ASSERT
534 private:
535 // Deadlock detection support for Mutex locks. List of locks own by thread.
536 Monitor* _owned_locks;
537 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
538 // thus the friendship
539 friend class Mutex;
540 friend class Monitor;
542 public:
543 void print_owned_locks_on(outputStream* st) const;
544 void print_owned_locks() const { print_owned_locks_on(tty); }
545 Monitor* owned_locks() const { return _owned_locks; }
546 bool owns_locks() const { return owned_locks() != NULL; }
547 bool owns_locks_but_compiled_lock() const;
549 // Deadlock detection
550 bool allow_allocation() { return _allow_allocation_count == 0; }
551 #endif
553 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
555 private:
556 volatile int _jvmti_env_iteration_count;
558 public:
559 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
560 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
561 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
563 // Code generation
564 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
565 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
566 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
568 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
569 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
571 #define TLAB_FIELD_OFFSET(name) \
572 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
574 TLAB_FIELD_OFFSET(start)
575 TLAB_FIELD_OFFSET(end)
576 TLAB_FIELD_OFFSET(top)
577 TLAB_FIELD_OFFSET(pf_top)
578 TLAB_FIELD_OFFSET(size) // desired_size
579 TLAB_FIELD_OFFSET(refill_waste_limit)
580 TLAB_FIELD_OFFSET(number_of_refills)
581 TLAB_FIELD_OFFSET(fast_refill_waste)
582 TLAB_FIELD_OFFSET(slow_allocations)
584 #undef TLAB_FIELD_OFFSET
586 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
588 public:
589 volatile intptr_t _Stalled ;
590 volatile int _TypeTag ;
591 ParkEvent * _ParkEvent ; // for synchronized()
592 ParkEvent * _SleepEvent ; // for Thread.sleep
593 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
594 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
595 int NativeSyncRecursion ; // diagnostic
597 volatile int _OnTrap ; // Resume-at IP delta
598 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
599 jint _hashStateX ; // thread-specific hashCode generator state
600 jint _hashStateY ;
601 jint _hashStateZ ;
602 void * _schedctl ;
604 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code
605 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); }
606 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); }
608 volatile jint rng [4] ; // RNG for spin loop
610 // Low-level leaf-lock primitives used to implement synchronization
611 // and native monitor-mutex infrastructure.
612 // Not for general synchronization use.
613 static void SpinAcquire (volatile int * Lock, const char * Name) ;
614 static void SpinRelease (volatile int * Lock) ;
615 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
616 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
617 static void muxRelease (volatile intptr_t * Lock) ;
618 };
620 // Inline implementation of Thread::current()
621 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
622 // startup.
623 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
624 // period. This is inlined in thread_<os_family>.inline.hpp.
626 inline Thread* Thread::current() {
627 #ifdef ASSERT
628 // This function is very high traffic. Define PARANOID to enable expensive
629 // asserts.
630 #ifdef PARANOID
631 // Signal handler should call ThreadLocalStorage::get_thread_slow()
632 Thread* t = ThreadLocalStorage::get_thread_slow();
633 assert(t != NULL && !t->is_inside_signal_handler(),
634 "Don't use Thread::current() inside signal handler");
635 #endif
636 #endif
637 Thread* thread = ThreadLocalStorage::thread();
638 assert(thread != NULL, "just checking");
639 return thread;
640 }
642 // Name support for threads. non-JavaThread subclasses with multiple
643 // uniquely named instances should derive from this.
644 class NamedThread: public Thread {
645 friend class VMStructs;
646 enum {
647 max_name_len = 64
648 };
649 private:
650 char* _name;
651 // log JavaThread being processed by oops_do
652 JavaThread* _processed_thread;
654 public:
655 NamedThread();
656 ~NamedThread();
657 // May only be called once per thread.
658 void set_name(const char* format, ...);
659 virtual bool is_Named_thread() const { return true; }
660 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
661 JavaThread *processed_thread() { return _processed_thread; }
662 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
663 };
665 // Worker threads are named and have an id of an assigned work.
666 class WorkerThread: public NamedThread {
667 private:
668 uint _id;
669 public:
670 WorkerThread() : _id(0) { }
671 virtual bool is_Worker_thread() const { return true; }
673 virtual WorkerThread* as_Worker_thread() const {
674 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
675 return (WorkerThread*) this;
676 }
678 void set_id(uint work_id) { _id = work_id; }
679 uint id() const { return _id; }
680 };
682 // A single WatcherThread is used for simulating timer interrupts.
683 class WatcherThread: public Thread {
684 friend class VMStructs;
685 public:
686 virtual void run();
688 private:
689 static WatcherThread* _watcher_thread;
691 volatile static bool _should_terminate; // updated without holding lock
692 public:
693 enum SomeConstants {
694 delay_interval = 10 // interrupt delay in milliseconds
695 };
697 // Constructor
698 WatcherThread();
700 // Tester
701 bool is_Watcher_thread() const { return true; }
703 // Printing
704 char* name() const { return (char*)"VM Periodic Task Thread"; }
705 void print_on(outputStream* st) const;
706 void print() const { print_on(tty); }
708 // Returns the single instance of WatcherThread
709 static WatcherThread* watcher_thread() { return _watcher_thread; }
711 // Create and start the single instance of WatcherThread, or stop it on shutdown
712 static void start();
713 static void stop();
714 };
717 class CompilerThread;
719 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
721 class JavaThread: public Thread {
722 friend class VMStructs;
723 private:
724 JavaThread* _next; // The next thread in the Threads list
725 oop _threadObj; // The Java level thread object
727 #ifdef ASSERT
728 private:
729 int _java_call_counter;
731 public:
732 int java_call_counter() { return _java_call_counter; }
733 void inc_java_call_counter() { _java_call_counter++; }
734 void dec_java_call_counter() {
735 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
736 _java_call_counter--;
737 }
738 private: // restore original namespace restriction
739 #endif // ifdef ASSERT
741 #ifndef PRODUCT
742 public:
743 enum {
744 jump_ring_buffer_size = 16
745 };
746 private: // restore original namespace restriction
747 #endif
749 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
751 ThreadFunction _entry_point;
753 JNIEnv _jni_environment;
755 // Deopt support
756 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
758 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
759 // transition out of native
760 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
761 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
762 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
763 // Because deoptimization is lazy we must save jvmti requests to set locals
764 // in compiled frames until we deoptimize and we have an interpreter frame.
765 // This holds the pointer to array (yeah like there might be more than one) of
766 // description of compiled vframes that have locals that need to be updated.
767 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
769 // Handshake value for fixing 6243940. We need a place for the i2c
770 // adapter to store the callee methodOop. This value is NEVER live
771 // across a gc point so it does NOT have to be gc'd
772 // The handshake is open ended since we can't be certain that it will
773 // be NULLed. This is because we rarely ever see the race and end up
774 // in handle_wrong_method which is the backend of the handshake. See
775 // code in i2c adapters and handle_wrong_method.
777 methodOop _callee_target;
779 // Oop results of VM runtime calls
780 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved
781 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved
783 // See ReduceInitialCardMarks: this holds the precise space interval of
784 // the most recent slow path allocation for which compiled code has
785 // elided card-marks for performance along the fast-path.
786 MemRegion _deferred_card_mark;
788 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
789 // allocated during deoptimization
790 // and by JNI_MonitorEnter/Exit
792 // Async. requests support
793 enum AsyncRequests {
794 _no_async_condition = 0,
795 _async_exception,
796 _async_unsafe_access_error
797 };
798 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
799 oop _pending_async_exception;
801 // Safepoint support
802 public: // Expose _thread_state for SafeFetchInt()
803 volatile JavaThreadState _thread_state;
804 private:
805 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
806 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
808 // JavaThread termination support
809 enum TerminatedTypes {
810 _not_terminated = 0xDEAD - 2,
811 _thread_exiting, // JavaThread::exit() has been called for this thread
812 _thread_terminated, // JavaThread is removed from thread list
813 _vm_exited // JavaThread is still executing native code, but VM is terminated
814 // only VM_Exit can set _vm_exited
815 };
817 // In general a JavaThread's _terminated field transitions as follows:
818 //
819 // _not_terminated => _thread_exiting => _thread_terminated
820 //
821 // _vm_exited is a special value to cover the case of a JavaThread
822 // executing native code after the VM itself is terminated.
823 volatile TerminatedTypes _terminated;
824 // suspend/resume support
825 volatile bool _suspend_equivalent; // Suspend equivalent condition
826 jint _in_deopt_handler; // count of deoptimization
827 // handlers thread is in
828 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
829 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
830 // never locked) when throwing an exception. Used by interpreter only.
832 // JNI attach states:
833 enum JNIAttachStates {
834 _not_attaching_via_jni = 1, // thread is not attaching via JNI
835 _attaching_via_jni, // thread is attaching via JNI
836 _attached_via_jni // thread has attached via JNI
837 };
839 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
840 // A native thread that is attaching via JNI starts with a value
841 // of _attaching_via_jni and transitions to _attached_via_jni.
842 volatile JNIAttachStates _jni_attach_state;
844 public:
845 // State of the stack guard pages for this thread.
846 enum StackGuardState {
847 stack_guard_unused, // not needed
848 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
849 stack_guard_enabled // enabled
850 };
852 private:
854 StackGuardState _stack_guard_state;
856 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
857 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
858 // code)
859 volatile oop _exception_oop; // Exception thrown in compiled code
860 volatile address _exception_pc; // PC where exception happened
861 volatile address _exception_handler_pc; // PC for handler of exception
862 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
864 // support for compilation
865 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
867 // support for JNI critical regions
868 jint _jni_active_critical; // count of entries into JNI critical region
870 // For deadlock detection.
871 int _depth_first_number;
873 // JVMTI PopFrame support
874 // This is set to popframe_pending to signal that top Java frame should be popped immediately
875 int _popframe_condition;
877 #ifndef PRODUCT
878 int _jmp_ring_index;
879 struct {
880 // We use intptr_t instead of address so debugger doesn't try and display strings
881 intptr_t _target;
882 intptr_t _instruction;
883 const char* _file;
884 int _line;
885 } _jmp_ring[ jump_ring_buffer_size ];
886 #endif /* PRODUCT */
888 #ifndef SERIALGC
889 // Support for G1 barriers
891 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
892 // Set of all such queues.
893 static SATBMarkQueueSet _satb_mark_queue_set;
895 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
896 // Set of all such queues.
897 static DirtyCardQueueSet _dirty_card_queue_set;
899 void flush_barrier_queues();
900 #endif // !SERIALGC
902 friend class VMThread;
903 friend class ThreadWaitTransition;
904 friend class VM_Exit;
906 void initialize(); // Initialized the instance variables
908 public:
909 // Constructor
910 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
911 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
912 ~JavaThread();
914 #ifdef ASSERT
915 // verify this JavaThread hasn't be published in the Threads::list yet
916 void verify_not_published();
917 #endif
919 //JNI functiontable getter/setter for JVMTI jni function table interception API.
920 void set_jni_functions(struct JNINativeInterface_* functionTable) {
921 _jni_environment.functions = functionTable;
922 }
923 struct JNINativeInterface_* get_jni_functions() {
924 return (struct JNINativeInterface_ *)_jni_environment.functions;
925 }
927 // This function is called at thread creation to allow
928 // platform specific thread variables to be initialized.
929 void cache_global_variables();
931 // Executes Shutdown.shutdown()
932 void invoke_shutdown_hooks();
934 // Cleanup on thread exit
935 enum ExitType {
936 normal_exit,
937 jni_detach
938 };
939 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
941 void cleanup_failed_attach_current_thread();
943 // Testers
944 virtual bool is_Java_thread() const { return true; }
946 // compilation
947 void set_is_compiling(bool f) { _is_compiling = f; }
948 bool is_compiling() const { return _is_compiling; }
950 // Thread chain operations
951 JavaThread* next() const { return _next; }
952 void set_next(JavaThread* p) { _next = p; }
954 // Thread oop. threadObj() can be NULL for initial JavaThread
955 // (or for threads attached via JNI)
956 oop threadObj() const { return _threadObj; }
957 void set_threadObj(oop p) { _threadObj = p; }
959 ThreadPriority java_priority() const; // Read from threadObj()
961 // Prepare thread and add to priority queue. If a priority is
962 // not specified, use the priority of the thread object. Threads_lock
963 // must be held while this function is called.
964 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
966 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
967 address saved_exception_pc() { return _saved_exception_pc; }
970 ThreadFunction entry_point() const { return _entry_point; }
972 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
973 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
975 // Last frame anchor routines
977 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
979 // last_Java_sp
980 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
981 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
983 // last_Java_pc
985 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
987 // Safepoint support
988 JavaThreadState thread_state() const { return _thread_state; }
989 void set_thread_state(JavaThreadState s) { _thread_state=s; }
990 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
991 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
992 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
994 // thread has called JavaThread::exit() or is terminated
995 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
996 // thread is terminated (no longer on the threads list); we compare
997 // against the two non-terminated values so that a freed JavaThread
998 // will also be considered terminated.
999 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1000 void set_terminated(TerminatedTypes t) { _terminated = t; }
1001 // special for Threads::remove() which is static:
1002 void set_terminated_value() { _terminated = _thread_terminated; }
1003 void block_if_vm_exited();
1005 bool doing_unsafe_access() { return _doing_unsafe_access; }
1006 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1008 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1009 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1012 // Suspend/resume support for JavaThread
1014 private:
1015 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1016 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1018 public:
1019 void java_suspend();
1020 void java_resume();
1021 int java_suspend_self();
1023 void check_and_wait_while_suspended() {
1024 assert(JavaThread::current() == this, "sanity check");
1026 bool do_self_suspend;
1027 do {
1028 // were we externally suspended while we were waiting?
1029 do_self_suspend = handle_special_suspend_equivalent_condition();
1030 if (do_self_suspend) {
1031 // don't surprise the thread that suspended us by returning
1032 java_suspend_self();
1033 set_suspend_equivalent();
1034 }
1035 } while (do_self_suspend);
1036 }
1037 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1038 // Check for async exception in addition to safepoint and suspend request.
1039 static void check_special_condition_for_native_trans(JavaThread *thread);
1041 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1042 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1043 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1044 // Warning: is_ext_suspend_completed() may temporarily drop the
1045 // SR_lock to allow the thread to reach a stable thread state if
1046 // it is currently in a transient thread state.
1047 return is_ext_suspend_completed(false /*!called_by_wait */,
1048 SuspendRetryDelay, bits);
1049 }
1051 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1052 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1053 // passed as the count and delay parameters. Experiments with specific
1054 // calls to wait_for_ext_suspend_completion() can be done by passing
1055 // other values in the code. Experiments with all calls can be done
1056 // via the appropriate -XX options.
1057 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1059 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1060 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1062 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1063 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1064 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1066 bool is_external_suspend() const {
1067 return (_suspend_flags & _external_suspend) != 0;
1068 }
1069 // Whenever a thread transitions from native to vm/java it must suspend
1070 // if external|deopt suspend is present.
1071 bool is_suspend_after_native() const {
1072 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1073 }
1075 // external suspend request is completed
1076 bool is_ext_suspended() const {
1077 return (_suspend_flags & _ext_suspended) != 0;
1078 }
1080 bool is_external_suspend_with_lock() const {
1081 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1082 return is_external_suspend();
1083 }
1085 // Special method to handle a pending external suspend request
1086 // when a suspend equivalent condition lifts.
1087 bool handle_special_suspend_equivalent_condition() {
1088 assert(is_suspend_equivalent(),
1089 "should only be called in a suspend equivalence condition");
1090 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1091 bool ret = is_external_suspend();
1092 if (!ret) {
1093 // not about to self-suspend so clear suspend equivalence
1094 clear_suspend_equivalent();
1095 }
1096 // implied else:
1097 // We have a pending external suspend request so we leave the
1098 // suspend_equivalent flag set until java_suspend_self() sets
1099 // the ext_suspended flag and clears the suspend_equivalent
1100 // flag. This insures that wait_for_ext_suspend_completion()
1101 // will return consistent values.
1102 return ret;
1103 }
1105 // utility methods to see if we are doing some kind of suspension
1106 bool is_being_ext_suspended() const {
1107 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1108 return is_ext_suspended() || is_external_suspend();
1109 }
1111 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1113 void set_suspend_equivalent() { _suspend_equivalent = true; };
1114 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1116 // Thread.stop support
1117 void send_thread_stop(oop throwable);
1118 AsyncRequests clear_special_runtime_exit_condition() {
1119 AsyncRequests x = _special_runtime_exit_condition;
1120 _special_runtime_exit_condition = _no_async_condition;
1121 return x;
1122 }
1124 // Are any async conditions present?
1125 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1127 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1129 // these next two are also used for self-suspension and async exception support
1130 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1132 // Return true if JavaThread has an asynchronous condition or
1133 // if external suspension is requested.
1134 bool has_special_runtime_exit_condition() {
1135 // We call is_external_suspend() last since external suspend should
1136 // be less common. Because we don't use is_external_suspend_with_lock
1137 // it is possible that we won't see an asynchronous external suspend
1138 // request that has just gotten started, i.e., SR_lock grabbed but
1139 // _external_suspend field change either not made yet or not visible
1140 // yet. However, this is okay because the request is asynchronous and
1141 // we will see the new flag value the next time through. It's also
1142 // possible that the external suspend request is dropped after
1143 // we have checked is_external_suspend(), we will recheck its value
1144 // under SR_lock in java_suspend_self().
1145 return (_special_runtime_exit_condition != _no_async_condition) ||
1146 is_external_suspend() || is_deopt_suspend();
1147 }
1149 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1151 void set_pending_async_exception(oop e) {
1152 _pending_async_exception = e;
1153 _special_runtime_exit_condition = _async_exception;
1154 set_has_async_exception();
1155 }
1157 // Fast-locking support
1158 bool is_lock_owned(address adr) const;
1160 // Accessors for vframe array top
1161 // The linked list of vframe arrays are sorted on sp. This means when we
1162 // unpack the head must contain the vframe array to unpack.
1163 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1164 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1166 // Side structure for defering update of java frame locals until deopt occurs
1167 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1168 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1170 // These only really exist to make debugging deopt problems simpler
1172 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1173 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1175 // The special resourceMark used during deoptimization
1177 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1178 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1180 intptr_t* must_deopt_id() { return _must_deopt_id; }
1181 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1182 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1184 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1185 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1187 methodOop callee_target() const { return _callee_target; }
1188 void set_callee_target (methodOop x) { _callee_target = x; }
1190 // Oop results of vm runtime calls
1191 oop vm_result() const { return _vm_result; }
1192 void set_vm_result (oop x) { _vm_result = x; }
1194 oop vm_result_2() const { return _vm_result_2; }
1195 void set_vm_result_2 (oop x) { _vm_result_2 = x; }
1197 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1198 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1200 // Exception handling for compiled methods
1201 oop exception_oop() const { return _exception_oop; }
1202 address exception_pc() const { return _exception_pc; }
1203 address exception_handler_pc() const { return _exception_handler_pc; }
1204 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1206 void set_exception_oop(oop o) { _exception_oop = o; }
1207 void set_exception_pc(address a) { _exception_pc = a; }
1208 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1209 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1211 // Stack overflow support
1212 inline size_t stack_available(address cur_sp);
1213 address stack_yellow_zone_base()
1214 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1215 size_t stack_yellow_zone_size()
1216 { return StackYellowPages * os::vm_page_size(); }
1217 address stack_red_zone_base()
1218 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1219 size_t stack_red_zone_size()
1220 { return StackRedPages * os::vm_page_size(); }
1221 bool in_stack_yellow_zone(address a)
1222 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1223 bool in_stack_red_zone(address a)
1224 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1226 void create_stack_guard_pages();
1227 void remove_stack_guard_pages();
1229 void enable_stack_yellow_zone();
1230 void disable_stack_yellow_zone();
1231 void enable_stack_red_zone();
1232 void disable_stack_red_zone();
1234 inline bool stack_yellow_zone_disabled();
1235 inline bool stack_yellow_zone_enabled();
1237 // Attempt to reguard the stack after a stack overflow may have occurred.
1238 // Returns true if (a) guard pages are not needed on this thread, (b) the
1239 // pages are already guarded, or (c) the pages were successfully reguarded.
1240 // Returns false if there is not enough stack space to reguard the pages, in
1241 // which case the caller should unwind a frame and try again. The argument
1242 // should be the caller's (approximate) sp.
1243 bool reguard_stack(address cur_sp);
1244 // Similar to above but see if current stackpoint is out of the guard area
1245 // and reguard if possible.
1246 bool reguard_stack(void);
1248 // Misc. accessors/mutators
1249 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1250 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1251 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1253 #ifndef PRODUCT
1254 void record_jump(address target, address instr, const char* file, int line);
1255 #endif /* PRODUCT */
1257 // For assembly stub generation
1258 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1259 #ifndef PRODUCT
1260 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1261 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1262 #endif /* PRODUCT */
1263 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1264 static ByteSize last_Java_sp_offset() {
1265 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1266 }
1267 static ByteSize last_Java_pc_offset() {
1268 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1269 }
1270 static ByteSize frame_anchor_offset() {
1271 return byte_offset_of(JavaThread, _anchor);
1272 }
1273 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1274 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1275 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1276 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1277 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1278 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1279 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1280 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1281 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1282 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1283 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1284 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1286 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1287 static ByteSize should_post_on_exceptions_flag_offset() {
1288 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1289 }
1291 #ifndef SERIALGC
1292 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1293 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1294 #endif // !SERIALGC
1296 // Returns the jni environment for this thread
1297 JNIEnv* jni_environment() { return &_jni_environment; }
1299 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1300 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1301 // Only return NULL if thread is off the thread list; starting to
1302 // exit should not return NULL.
1303 if (thread_from_jni_env->is_terminated()) {
1304 thread_from_jni_env->block_if_vm_exited();
1305 return NULL;
1306 } else {
1307 return thread_from_jni_env;
1308 }
1309 }
1311 // JNI critical regions. These can nest.
1312 bool in_critical() { return _jni_active_critical > 0; }
1313 void enter_critical() { assert(Thread::current() == this,
1314 "this must be current thread");
1315 _jni_active_critical++; }
1316 void exit_critical() { assert(Thread::current() == this,
1317 "this must be current thread");
1318 _jni_active_critical--;
1319 assert(_jni_active_critical >= 0,
1320 "JNI critical nesting problem?"); }
1322 // For deadlock detection
1323 int depth_first_number() { return _depth_first_number; }
1324 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1326 private:
1327 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1329 public:
1330 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1331 void add_monitor_chunk(MonitorChunk* chunk);
1332 void remove_monitor_chunk(MonitorChunk* chunk);
1333 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1334 void inc_in_deopt_handler() { _in_deopt_handler++; }
1335 void dec_in_deopt_handler() {
1336 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1337 if (_in_deopt_handler > 0) { // robustness
1338 _in_deopt_handler--;
1339 }
1340 }
1342 private:
1343 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1345 public:
1347 // Frame iteration; calls the function f for all frames on the stack
1348 void frames_do(void f(frame*, const RegisterMap*));
1350 // Memory operations
1351 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1353 // Sweeper operations
1354 void nmethods_do(CodeBlobClosure* cf);
1356 // Memory management operations
1357 void gc_epilogue();
1358 void gc_prologue();
1360 // Misc. operations
1361 char* name() const { return (char*)get_thread_name(); }
1362 void print_on(outputStream* st) const;
1363 void print() const { print_on(tty); }
1364 void print_value();
1365 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1366 void print_thread_state() const PRODUCT_RETURN;
1367 void print_on_error(outputStream* st, char* buf, int buflen) const;
1368 void verify();
1369 const char* get_thread_name() const;
1370 private:
1371 // factor out low-level mechanics for use in both normal and error cases
1372 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1373 public:
1374 const char* get_threadgroup_name() const;
1375 const char* get_parent_name() const;
1377 // Accessing frames
1378 frame last_frame() {
1379 _anchor.make_walkable(this);
1380 return pd_last_frame();
1381 }
1382 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1384 // Returns method at 'depth' java or native frames down the stack
1385 // Used for security checks
1386 klassOop security_get_caller_class(int depth);
1388 // Print stack trace in external format
1389 void print_stack_on(outputStream* st);
1390 void print_stack() { print_stack_on(tty); }
1392 // Print stack traces in various internal formats
1393 void trace_stack() PRODUCT_RETURN;
1394 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1395 void trace_frames() PRODUCT_RETURN;
1396 void trace_oops() PRODUCT_RETURN;
1398 // Print an annotated view of the stack frames
1399 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1400 void validate_frame_layout() {
1401 print_frame_layout(0, true);
1402 }
1404 // Returns the number of stack frames on the stack
1405 int depth() const;
1407 // Function for testing deoptimization
1408 void deoptimize();
1409 void make_zombies();
1411 void deoptimized_wrt_marked_nmethods();
1413 // Profiling operation (see fprofile.cpp)
1414 public:
1415 bool profile_last_Java_frame(frame* fr);
1417 private:
1418 ThreadProfiler* _thread_profiler;
1419 private:
1420 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1421 friend class FlatProfilerTask; // uses get_thread_profiler.
1422 friend class ThreadProfilerMark; // uses get_thread_profiler.
1423 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1424 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1425 ThreadProfiler* result = _thread_profiler;
1426 _thread_profiler = tp;
1427 return result;
1428 }
1430 // Static operations
1431 public:
1432 // Returns the running thread as a JavaThread
1433 static inline JavaThread* current();
1435 // Returns the active Java thread. Do not use this if you know you are calling
1436 // from a JavaThread, as it's slower than JavaThread::current. If called from
1437 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1438 // operation. You may not want that either.
1439 static JavaThread* active();
1441 inline CompilerThread* as_CompilerThread();
1443 public:
1444 virtual void run();
1445 void thread_main_inner();
1447 private:
1448 // PRIVILEGED STACK
1449 PrivilegedElement* _privileged_stack_top;
1450 GrowableArray<oop>* _array_for_gc;
1451 public:
1453 // Returns the privileged_stack information.
1454 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1455 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1456 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1458 public:
1459 // Thread local information maintained by JVMTI.
1460 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1461 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1462 // getter is used to get this JavaThread's JvmtiThreadState if it has
1463 // one which means NULL can be returned. JvmtiThreadState::state_for()
1464 // is used to get the specified JavaThread's JvmtiThreadState if it has
1465 // one or it allocates a new JvmtiThreadState for the JavaThread and
1466 // returns it. JvmtiThreadState::state_for() will return NULL only if
1467 // the specified JavaThread is exiting.
1468 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1469 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1470 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1471 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1473 // JVMTI PopFrame support
1474 // Setting and clearing popframe_condition
1475 // All of these enumerated values are bits. popframe_pending
1476 // indicates that a PopFrame() has been requested and not yet been
1477 // completed. popframe_processing indicates that that PopFrame() is in
1478 // the process of being completed. popframe_force_deopt_reexecution_bit
1479 // indicates that special handling is required when returning to a
1480 // deoptimized caller.
1481 enum PopCondition {
1482 popframe_inactive = 0x00,
1483 popframe_pending_bit = 0x01,
1484 popframe_processing_bit = 0x02,
1485 popframe_force_deopt_reexecution_bit = 0x04
1486 };
1487 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1488 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1489 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1490 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1491 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1492 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1493 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1494 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1495 #ifdef CC_INTERP
1496 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1497 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1498 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1499 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1500 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1501 #endif
1503 private:
1504 // Saved incoming arguments to popped frame.
1505 // Used only when popped interpreted frame returns to deoptimized frame.
1506 void* _popframe_preserved_args;
1507 int _popframe_preserved_args_size;
1509 public:
1510 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1511 void* popframe_preserved_args();
1512 ByteSize popframe_preserved_args_size();
1513 WordSize popframe_preserved_args_size_in_words();
1514 void popframe_free_preserved_args();
1517 private:
1518 JvmtiThreadState *_jvmti_thread_state;
1519 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1521 // Used by the interpreter in fullspeed mode for frame pop, method
1522 // entry, method exit and single stepping support. This field is
1523 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1524 // It can be set to zero asynchronously (i.e., without a VM operation
1525 // or a lock) so we have to be very careful.
1526 int _interp_only_mode;
1528 public:
1529 // used by the interpreter for fullspeed debugging support (see above)
1530 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1531 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1532 int get_interp_only_mode() { return _interp_only_mode; }
1533 void increment_interp_only_mode() { ++_interp_only_mode; }
1534 void decrement_interp_only_mode() { --_interp_only_mode; }
1536 // support for cached flag that indicates whether exceptions need to be posted for this thread
1537 // if this is false, we can avoid deoptimizing when events are thrown
1538 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1539 private:
1540 int _should_post_on_exceptions_flag;
1542 public:
1543 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1544 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1546 private:
1547 ThreadStatistics *_thread_stat;
1549 public:
1550 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1552 // Return a blocker object for which this thread is blocked parking.
1553 oop current_park_blocker();
1555 private:
1556 static size_t _stack_size_at_create;
1558 public:
1559 static inline size_t stack_size_at_create(void) {
1560 return _stack_size_at_create;
1561 }
1562 static inline void set_stack_size_at_create(size_t value) {
1563 _stack_size_at_create = value;
1564 }
1566 #ifndef SERIALGC
1567 // SATB marking queue support
1568 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1569 static SATBMarkQueueSet& satb_mark_queue_set() {
1570 return _satb_mark_queue_set;
1571 }
1573 // Dirty card queue support
1574 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1575 static DirtyCardQueueSet& dirty_card_queue_set() {
1576 return _dirty_card_queue_set;
1577 }
1578 #endif // !SERIALGC
1580 // This method initializes the SATB and dirty card queues before a
1581 // JavaThread is added to the Java thread list. Right now, we don't
1582 // have to do anything to the dirty card queue (it should have been
1583 // activated when the thread was created), but we have to activate
1584 // the SATB queue if the thread is created while a marking cycle is
1585 // in progress. The activation / de-activation of the SATB queues at
1586 // the beginning / end of a marking cycle is done during safepoints
1587 // so we have to make sure this method is called outside one to be
1588 // able to safely read the active field of the SATB queue set. Right
1589 // now, it is called just before the thread is added to the Java
1590 // thread list in the Threads::add() method. That method is holding
1591 // the Threads_lock which ensures we are outside a safepoint. We
1592 // cannot do the obvious and set the active field of the SATB queue
1593 // when the thread is created given that, in some cases, safepoints
1594 // might happen between the JavaThread constructor being called and the
1595 // thread being added to the Java thread list (an example of this is
1596 // when the structure for the DestroyJavaVM thread is created).
1597 #ifndef SERIALGC
1598 void initialize_queues();
1599 #else // !SERIALGC
1600 void initialize_queues() { }
1601 #endif // !SERIALGC
1603 // Machine dependent stuff
1604 #ifdef TARGET_OS_ARCH_linux_x86
1605 # include "thread_linux_x86.hpp"
1606 #endif
1607 #ifdef TARGET_OS_ARCH_linux_sparc
1608 # include "thread_linux_sparc.hpp"
1609 #endif
1610 #ifdef TARGET_OS_ARCH_linux_zero
1611 # include "thread_linux_zero.hpp"
1612 #endif
1613 #ifdef TARGET_OS_ARCH_solaris_x86
1614 # include "thread_solaris_x86.hpp"
1615 #endif
1616 #ifdef TARGET_OS_ARCH_solaris_sparc
1617 # include "thread_solaris_sparc.hpp"
1618 #endif
1619 #ifdef TARGET_OS_ARCH_windows_x86
1620 # include "thread_windows_x86.hpp"
1621 #endif
1622 #ifdef TARGET_OS_ARCH_linux_arm
1623 # include "thread_linux_arm.hpp"
1624 #endif
1625 #ifdef TARGET_OS_ARCH_linux_ppc
1626 # include "thread_linux_ppc.hpp"
1627 #endif
1628 #ifdef TARGET_OS_ARCH_bsd_x86
1629 # include "thread_bsd_x86.hpp"
1630 #endif
1631 #ifdef TARGET_OS_ARCH_bsd_zero
1632 # include "thread_bsd_zero.hpp"
1633 #endif
1636 public:
1637 void set_blocked_on_compilation(bool value) {
1638 _blocked_on_compilation = value;
1639 }
1641 bool blocked_on_compilation() {
1642 return _blocked_on_compilation;
1643 }
1644 protected:
1645 bool _blocked_on_compilation;
1648 // JSR166 per-thread parker
1649 private:
1650 Parker* _parker;
1651 public:
1652 Parker* parker() { return _parker; }
1654 // Biased locking support
1655 private:
1656 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1657 public:
1658 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1659 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1661 // clearing/querying jni attach status
1662 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1663 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1664 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); }
1665 private:
1666 // This field is used to determine if a thread has claimed
1667 // a par_id: it is -1 if the thread has not claimed a par_id;
1668 // otherwise its value is the par_id that has been claimed.
1669 int _claimed_par_id;
1670 public:
1671 int get_claimed_par_id() { return _claimed_par_id; }
1672 void set_claimed_par_id(int id) { _claimed_par_id = id;}
1673 };
1675 // Inline implementation of JavaThread::current
1676 inline JavaThread* JavaThread::current() {
1677 Thread* thread = ThreadLocalStorage::thread();
1678 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1679 return (JavaThread*)thread;
1680 }
1682 inline CompilerThread* JavaThread::as_CompilerThread() {
1683 assert(is_Compiler_thread(), "just checking");
1684 return (CompilerThread*)this;
1685 }
1687 inline bool JavaThread::stack_yellow_zone_disabled() {
1688 return _stack_guard_state == stack_guard_yellow_disabled;
1689 }
1691 inline bool JavaThread::stack_yellow_zone_enabled() {
1692 #ifdef ASSERT
1693 if (os::uses_stack_guard_pages()) {
1694 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1695 }
1696 #endif
1697 return _stack_guard_state == stack_guard_enabled;
1698 }
1700 inline size_t JavaThread::stack_available(address cur_sp) {
1701 // This code assumes java stacks grow down
1702 address low_addr; // Limit on the address for deepest stack depth
1703 if ( _stack_guard_state == stack_guard_unused) {
1704 low_addr = stack_base() - stack_size();
1705 } else {
1706 low_addr = stack_yellow_zone_base();
1707 }
1708 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1709 }
1711 // A thread used for Compilation.
1712 class CompilerThread : public JavaThread {
1713 friend class VMStructs;
1714 private:
1715 CompilerCounters* _counters;
1717 ciEnv* _env;
1718 CompileLog* _log;
1719 CompileTask* _task;
1720 CompileQueue* _queue;
1721 BufferBlob* _buffer_blob;
1723 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1725 public:
1727 static CompilerThread* current();
1729 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1731 bool is_Compiler_thread() const { return true; }
1732 // Hide this compiler thread from external view.
1733 bool is_hidden_from_external_view() const { return true; }
1735 CompileQueue* queue() { return _queue; }
1736 CompilerCounters* counters() { return _counters; }
1738 // Get/set the thread's compilation environment.
1739 ciEnv* env() { return _env; }
1740 void set_env(ciEnv* env) { _env = env; }
1742 BufferBlob* get_buffer_blob() { return _buffer_blob; }
1743 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1745 // Get/set the thread's logging information
1746 CompileLog* log() { return _log; }
1747 void init_log(CompileLog* log) {
1748 // Set once, for good.
1749 assert(_log == NULL, "set only once");
1750 _log = log;
1751 }
1753 // GC support
1754 // Apply "f->do_oop" to all root oops in "this".
1755 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1756 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1758 #ifndef PRODUCT
1759 private:
1760 IdealGraphPrinter *_ideal_graph_printer;
1761 public:
1762 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1763 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1764 #endif
1766 // Get/set the thread's current task
1767 CompileTask* task() { return _task; }
1768 void set_task(CompileTask* task) { _task = task; }
1770 // Track the nmethod currently being scanned by the sweeper
1771 void set_scanned_nmethod(nmethod* nm) {
1772 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1773 _scanned_nmethod = nm;
1774 }
1775 };
1777 inline CompilerThread* CompilerThread::current() {
1778 return JavaThread::current()->as_CompilerThread();
1779 }
1782 // The active thread queue. It also keeps track of the current used
1783 // thread priorities.
1784 class Threads: AllStatic {
1785 friend class VMStructs;
1786 private:
1787 static JavaThread* _thread_list;
1788 static int _number_of_threads;
1789 static int _number_of_non_daemon_threads;
1790 static int _return_code;
1792 public:
1793 // Thread management
1794 // force_daemon is a concession to JNI, where we may need to add a
1795 // thread to the thread list before allocating its thread object
1796 static void add(JavaThread* p, bool force_daemon = false);
1797 static void remove(JavaThread* p);
1798 static bool includes(JavaThread* p);
1799 static JavaThread* first() { return _thread_list; }
1800 static void threads_do(ThreadClosure* tc);
1802 // Initializes the vm and creates the vm thread
1803 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1804 static void convert_vm_init_libraries_to_agents();
1805 static void create_vm_init_libraries();
1806 static void create_vm_init_agents();
1807 static void shutdown_vm_agents();
1808 static bool destroy_vm();
1809 // Supported VM versions via JNI
1810 // Includes JNI_VERSION_1_1
1811 static jboolean is_supported_jni_version_including_1_1(jint version);
1812 // Does not include JNI_VERSION_1_1
1813 static jboolean is_supported_jni_version(jint version);
1815 // Garbage collection
1816 static void follow_other_roots(void f(oop*));
1818 // Apply "f->do_oop" to all root oops in all threads.
1819 // This version may only be called by sequential code.
1820 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
1821 // This version may be called by sequential or parallel code.
1822 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf);
1823 // This creates a list of GCTasks, one per thread.
1824 static void create_thread_roots_tasks(GCTaskQueue* q);
1825 // This creates a list of GCTasks, one per thread, for marking objects.
1826 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1828 // Apply "f->do_oop" to roots in all threads that
1829 // are part of compiled frames
1830 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1832 static void convert_hcode_pointers();
1833 static void restore_hcode_pointers();
1835 // Sweeper
1836 static void nmethods_do(CodeBlobClosure* cf);
1838 static void gc_epilogue();
1839 static void gc_prologue();
1841 // Verification
1842 static void verify();
1843 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1844 static void print(bool print_stacks, bool internal_format) {
1845 // this function is only used by debug.cpp
1846 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1847 }
1848 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1850 // Get Java threads that are waiting to enter a monitor. If doLock
1851 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1852 // VM needs to be at a safepoint.
1853 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1854 address monitor, bool doLock);
1856 // Get owning Java thread from the monitor's owner field. If doLock
1857 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1858 // VM needs to be at a safepoint.
1859 static JavaThread *owning_thread_from_monitor_owner(address owner,
1860 bool doLock);
1862 // Number of threads on the active threads list
1863 static int number_of_threads() { return _number_of_threads; }
1864 // Number of non-daemon threads on the active threads list
1865 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1867 // Deoptimizes all frames tied to marked nmethods
1868 static void deoptimized_wrt_marked_nmethods();
1870 };
1873 // Thread iterator
1874 class ThreadClosure: public StackObj {
1875 public:
1876 virtual void do_thread(Thread* thread) = 0;
1877 };
1879 class SignalHandlerMark: public StackObj {
1880 private:
1881 Thread* _thread;
1882 public:
1883 SignalHandlerMark(Thread* t) {
1884 _thread = t;
1885 if (_thread) _thread->enter_signal_handler();
1886 }
1887 ~SignalHandlerMark() {
1888 if (_thread) _thread->leave_signal_handler();
1889 _thread = NULL;
1890 }
1891 };
1894 #endif // SHARE_VM_RUNTIME_THREAD_HPP