Sun, 01 Jan 2012 11:17:59 -0500
7125934: Add a fast unordered timestamp capability to Hotspot on x86/x64
Summary: Add rdtsc detection and inline generation.
Reviewed-by: kamg, dholmes
Contributed-by: karen.kinnear@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 "utilities/exceptions.hpp"
45 #include "utilities/top.hpp"
46 #ifndef SERIALGC
47 #include "gc_implementation/g1/dirtyCardQueue.hpp"
48 #include "gc_implementation/g1/satbQueue.hpp"
49 #endif
50 #ifdef ZERO
51 #ifdef TARGET_ARCH_zero
52 # include "stack_zero.hpp"
53 #endif
54 #endif
56 class ThreadSafepointState;
57 class ThreadProfiler;
59 class JvmtiThreadState;
60 class JvmtiGetLoadedClassesClosure;
61 class ThreadStatistics;
62 class ConcurrentLocksDump;
63 class ParkEvent;
64 class Parker;
66 class ciEnv;
67 class CompileThread;
68 class CompileLog;
69 class CompileTask;
70 class CompileQueue;
71 class CompilerCounters;
72 class vframeArray;
74 class DeoptResourceMark;
75 class jvmtiDeferredLocalVariableSet;
77 class GCTaskQueue;
78 class ThreadClosure;
79 class IdealGraphPrinter;
81 class WorkerThread;
83 // Class hierarchy
84 // - Thread
85 // - NamedThread
86 // - VMThread
87 // - ConcurrentGCThread
88 // - WorkerThread
89 // - GangWorker
90 // - GCTaskThread
91 // - JavaThread
92 // - WatcherThread
94 class Thread: public ThreadShadow {
95 friend class VMStructs;
96 private:
97 // Exception handling
98 // (Note: _pending_exception and friends are in ThreadShadow)
99 //oop _pending_exception; // pending exception for current thread
100 // const char* _exception_file; // file information for exception (debugging only)
101 // int _exception_line; // line information for exception (debugging only)
103 // Support for forcing alignment of thread objects for biased locking
104 void* _real_malloc_address;
105 public:
106 void* operator new(size_t size);
107 void operator delete(void* p);
108 private:
110 // ***************************************************************
111 // Suspend and resume support
112 // ***************************************************************
113 //
114 // VM suspend/resume no longer exists - it was once used for various
115 // things including safepoints but was deprecated and finally removed
116 // in Java 7. Because VM suspension was considered "internal" Java-level
117 // suspension was considered "external", and this legacy naming scheme
118 // remains.
119 //
120 // External suspend/resume requests come from JVM_SuspendThread,
121 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
122 // ResumeThread. External
123 // suspend requests cause _external_suspend to be set and external
124 // resume requests cause _external_suspend to be cleared.
125 // External suspend requests do not nest on top of other external
126 // suspend requests. The higher level APIs reject suspend requests
127 // for already suspended threads.
128 //
129 // The external_suspend
130 // flag is checked by has_special_runtime_exit_condition() and java thread
131 // will self-suspend when handle_special_runtime_exit_condition() is
132 // called. Most uses of the _thread_blocked state in JavaThreads are
133 // considered the same as being externally suspended; if the blocking
134 // condition lifts, the JavaThread will self-suspend. Other places
135 // where VM checks for external_suspend include:
136 // + mutex granting (do not enter monitors when thread is suspended)
137 // + state transitions from _thread_in_native
138 //
139 // In general, java_suspend() does not wait for an external suspend
140 // request to complete. When it returns, the only guarantee is that
141 // the _external_suspend field is true.
142 //
143 // wait_for_ext_suspend_completion() is used to wait for an external
144 // suspend request to complete. External suspend requests are usually
145 // followed by some other interface call that requires the thread to
146 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
147 // the interface that requires quiescence, we give the JavaThread a
148 // chance to self-suspend before we need it to be quiescent. This
149 // improves overall suspend/query performance.
150 //
151 // _suspend_flags controls the behavior of java_ suspend/resume.
152 // It must be set under the protection of SR_lock. Read from the flag is
153 // OK without SR_lock as long as the value is only used as a hint.
154 // (e.g., check _external_suspend first without lock and then recheck
155 // inside SR_lock and finish the suspension)
156 //
157 // _suspend_flags is also overloaded for other "special conditions" so
158 // that a single check indicates whether any special action is needed
159 // eg. for async exceptions.
160 // -------------------------------------------------------------------
161 // Notes:
162 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
163 // but we still update its value to keep other part of the system (mainly
164 // JVMTI) happy. ThreadState is legacy code (see notes in
165 // osThread.hpp).
166 //
167 // 2. It would be more natural if set_external_suspend() is private and
168 // part of java_suspend(), but that probably would affect the suspend/query
169 // performance. Need more investigation on this.
170 //
172 // suspend/resume lock: used for self-suspend
173 Monitor* _SR_lock;
175 protected:
176 enum SuspendFlags {
177 // NOTE: avoid using the sign-bit as cc generates different test code
178 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
180 _external_suspend = 0x20000000U, // thread is asked to self suspend
181 _ext_suspended = 0x40000000U, // thread has self-suspended
182 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
184 _has_async_exception = 0x00000001U // there is a pending async exception
185 };
187 // various suspension related flags - atomically updated
188 // overloaded for async exception checking in check_special_condition_for_native_trans.
189 volatile uint32_t _suspend_flags;
191 private:
192 int _num_nested_signal;
194 public:
195 void enter_signal_handler() { _num_nested_signal++; }
196 void leave_signal_handler() { _num_nested_signal--; }
197 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
199 private:
200 // Debug tracing
201 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
203 // Active_handles points to a block of handles
204 JNIHandleBlock* _active_handles;
206 // One-element thread local free list
207 JNIHandleBlock* _free_handle_block;
209 // Point to the last handle mark
210 HandleMark* _last_handle_mark;
212 // The parity of the last strong_roots iteration in which this thread was
213 // claimed as a task.
214 jint _oops_do_parity;
216 public:
217 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
218 HandleMark* last_handle_mark() const { return _last_handle_mark; }
219 private:
221 // debug support for checking if code does allow safepoints or not
222 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
223 // mutex, or blocking on an object synchronizer (Java locking).
224 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
225 // If !allow_allocation(), then an assertion failure will happen during allocation
226 // (Hence, !allow_safepoint() => !allow_allocation()).
227 //
228 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
229 //
230 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
231 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
233 // Used by SkipGCALot class.
234 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
236 // Record when GC is locked out via the GC_locker mechanism
237 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
239 friend class No_Alloc_Verifier;
240 friend class No_Safepoint_Verifier;
241 friend class Pause_No_Safepoint_Verifier;
242 friend class ThreadLocalStorage;
243 friend class GC_locker;
245 ThreadLocalAllocBuffer _tlab; // Thread-local eden
246 jlong _allocated_bytes; // Cumulative number of bytes allocated on
247 // the Java heap
249 int _vm_operation_started_count; // VM_Operation support
250 int _vm_operation_completed_count; // VM_Operation support
252 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
253 // is waiting to lock
254 bool _current_pending_monitor_is_from_java; // locking is from Java code
256 // ObjectMonitor on which this thread called Object.wait()
257 ObjectMonitor* _current_waiting_monitor;
259 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
260 public:
261 ObjectMonitor* omFreeList;
262 int omFreeCount; // length of omFreeList
263 int omFreeProvision; // reload chunk size
264 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
265 int omInUseCount; // length of omInUseList
267 public:
268 enum {
269 is_definitely_current_thread = true
270 };
272 // Constructor
273 Thread();
274 virtual ~Thread();
276 // initializtion
277 void initialize_thread_local_storage();
279 // thread entry point
280 virtual void run();
282 // Testers
283 virtual bool is_VM_thread() const { return false; }
284 virtual bool is_Java_thread() const { return false; }
285 virtual bool is_Compiler_thread() const { return false; }
286 virtual bool is_hidden_from_external_view() const { return false; }
287 virtual bool is_jvmti_agent_thread() const { return false; }
288 // True iff the thread can perform GC operations at a safepoint.
289 // Generally will be true only of VM thread and parallel GC WorkGang
290 // threads.
291 virtual bool is_GC_task_thread() const { return false; }
292 virtual bool is_Watcher_thread() const { return false; }
293 virtual bool is_ConcurrentGC_thread() const { return false; }
294 virtual bool is_Named_thread() const { return false; }
295 virtual bool is_Worker_thread() const { return false; }
297 // Casts
298 virtual WorkerThread* as_Worker_thread() const { return NULL; }
300 virtual char* name() const { return (char*)"Unknown thread"; }
302 // Returns the current thread
303 static inline Thread* current();
305 // Common thread operations
306 static void set_priority(Thread* thread, ThreadPriority priority);
307 static ThreadPriority get_priority(const Thread* const thread);
308 static void start(Thread* thread);
309 static void interrupt(Thread* thr);
310 static bool is_interrupted(Thread* thr, bool clear_interrupted);
312 void set_native_thread_name(const char *name) {
313 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
314 os::set_native_thread_name(name);
315 }
317 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
318 Monitor* SR_lock() const { return _SR_lock; }
320 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
322 void set_suspend_flag(SuspendFlags f) {
323 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
324 uint32_t flags;
325 do {
326 flags = _suspend_flags;
327 }
328 while (Atomic::cmpxchg((jint)(flags | f),
329 (volatile jint*)&_suspend_flags,
330 (jint)flags) != (jint)flags);
331 }
332 void clear_suspend_flag(SuspendFlags f) {
333 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
334 uint32_t flags;
335 do {
336 flags = _suspend_flags;
337 }
338 while (Atomic::cmpxchg((jint)(flags & ~f),
339 (volatile jint*)&_suspend_flags,
340 (jint)flags) != (jint)flags);
341 }
343 void set_has_async_exception() {
344 set_suspend_flag(_has_async_exception);
345 }
346 void clear_has_async_exception() {
347 clear_suspend_flag(_has_async_exception);
348 }
350 // Support for Unhandled Oop detection
351 #ifdef CHECK_UNHANDLED_OOPS
352 private:
353 UnhandledOops* _unhandled_oops;
354 public:
355 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
356 // Mark oop safe for gc. It may be stack allocated but won't move.
357 void allow_unhandled_oop(oop *op) {
358 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
359 }
360 // Clear oops at safepoint so crashes point to unhandled oop violator
361 void clear_unhandled_oops() {
362 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
363 }
364 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
365 #endif // CHECK_UNHANDLED_OOPS
367 #ifndef PRODUCT
368 bool skip_gcalot() { return _skip_gcalot; }
369 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
370 #endif
372 public:
373 // Installs a pending exception to be inserted later
374 static void send_async_exception(oop thread_oop, oop java_throwable);
376 // Resource area
377 ResourceArea* resource_area() const { return _resource_area; }
378 void set_resource_area(ResourceArea* area) { _resource_area = area; }
380 OSThread* osthread() const { return _osthread; }
381 void set_osthread(OSThread* thread) { _osthread = thread; }
383 // JNI handle support
384 JNIHandleBlock* active_handles() const { return _active_handles; }
385 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
386 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
387 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
389 // Internal handle support
390 HandleArea* handle_area() const { return _handle_area; }
391 void set_handle_area(HandleArea* area) { _handle_area = area; }
393 // Thread-Local Allocation Buffer (TLAB) support
394 ThreadLocalAllocBuffer& tlab() { return _tlab; }
395 void initialize_tlab() {
396 if (UseTLAB) {
397 tlab().initialize();
398 }
399 }
401 jlong allocated_bytes() { return _allocated_bytes; }
402 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
403 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
404 jlong cooked_allocated_bytes() {
405 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
406 if (UseTLAB) {
407 size_t used_bytes = tlab().used_bytes();
408 if ((ssize_t)used_bytes > 0) {
409 // More-or-less valid tlab. The load_acquire above should ensure
410 // that the result of the add is <= the instantaneous value
411 return allocated_bytes + used_bytes;
412 }
413 }
414 return allocated_bytes;
415 }
417 // VM operation support
418 int vm_operation_ticket() { return ++_vm_operation_started_count; }
419 int vm_operation_completed_count() { return _vm_operation_completed_count; }
420 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
422 // For tracking the heavyweight monitor the thread is pending on.
423 ObjectMonitor* current_pending_monitor() {
424 return _current_pending_monitor;
425 }
426 void set_current_pending_monitor(ObjectMonitor* monitor) {
427 _current_pending_monitor = monitor;
428 }
429 void set_current_pending_monitor_is_from_java(bool from_java) {
430 _current_pending_monitor_is_from_java = from_java;
431 }
432 bool current_pending_monitor_is_from_java() {
433 return _current_pending_monitor_is_from_java;
434 }
436 // For tracking the ObjectMonitor on which this thread called Object.wait()
437 ObjectMonitor* current_waiting_monitor() {
438 return _current_waiting_monitor;
439 }
440 void set_current_waiting_monitor(ObjectMonitor* monitor) {
441 _current_waiting_monitor = monitor;
442 }
444 // GC support
445 // Apply "f->do_oop" to all root oops in "this".
446 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
447 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf);
449 // Handles the parallel case for the method below.
450 private:
451 bool claim_oops_do_par_case(int collection_parity);
452 public:
453 // Requires that "collection_parity" is that of the current strong roots
454 // iteration. If "is_par" is false, sets the parity of "this" to
455 // "collection_parity", and returns "true". If "is_par" is true,
456 // uses an atomic instruction to set the current threads parity to
457 // "collection_parity", if it is not already. Returns "true" iff the
458 // calling thread does the update, this indicates that the calling thread
459 // has claimed the thread's stack as a root groop in the current
460 // collection.
461 bool claim_oops_do(bool is_par, int collection_parity) {
462 if (!is_par) {
463 _oops_do_parity = collection_parity;
464 return true;
465 } else {
466 return claim_oops_do_par_case(collection_parity);
467 }
468 }
470 // Sweeper support
471 void nmethods_do(CodeBlobClosure* cf);
473 // Used by fast lock support
474 virtual bool is_lock_owned(address adr) const;
476 // Check if address is in the stack of the thread (not just for locks).
477 // Warning: the method can only be used on the running thread
478 bool is_in_stack(address adr) const;
480 // Sets this thread as starting thread. Returns failure if thread
481 // creation fails due to lack of memory, too many threads etc.
482 bool set_as_starting_thread();
484 protected:
485 // OS data associated with the thread
486 OSThread* _osthread; // Platform-specific thread information
488 // Thread local resource area for temporary allocation within the VM
489 ResourceArea* _resource_area;
491 // Thread local handle area for allocation of handles within the VM
492 HandleArea* _handle_area;
494 // Support for stack overflow handling, get_thread, etc.
495 address _stack_base;
496 size_t _stack_size;
497 uintptr_t _self_raw_id; // used by get_thread (mutable)
498 int _lgrp_id;
500 public:
501 // Stack overflow support
502 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
504 void set_stack_base(address base) { _stack_base = base; }
505 size_t stack_size() const { return _stack_size; }
506 void set_stack_size(size_t size) { _stack_size = size; }
507 void record_stack_base_and_size();
509 bool on_local_stack(address adr) const {
510 /* QQQ this has knowledge of direction, ought to be a stack method */
511 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
512 }
514 uintptr_t self_raw_id() { return _self_raw_id; }
515 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
517 int lgrp_id() const { return _lgrp_id; }
518 void set_lgrp_id(int value) { _lgrp_id = value; }
520 // Printing
521 void print_on(outputStream* st) const;
522 void print() const { print_on(tty); }
523 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
525 // Debug-only code
527 #ifdef ASSERT
528 private:
529 // Deadlock detection support for Mutex locks. List of locks own by thread.
530 Monitor* _owned_locks;
531 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
532 // thus the friendship
533 friend class Mutex;
534 friend class Monitor;
536 public:
537 void print_owned_locks_on(outputStream* st) const;
538 void print_owned_locks() const { print_owned_locks_on(tty); }
539 Monitor* owned_locks() const { return _owned_locks; }
540 bool owns_locks() const { return owned_locks() != NULL; }
541 bool owns_locks_but_compiled_lock() const;
543 // Deadlock detection
544 bool allow_allocation() { return _allow_allocation_count == 0; }
545 #endif
547 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
549 private:
550 volatile int _jvmti_env_iteration_count;
552 public:
553 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
554 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
555 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
557 // Code generation
558 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
559 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
560 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
562 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
563 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
565 #define TLAB_FIELD_OFFSET(name) \
566 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
568 TLAB_FIELD_OFFSET(start)
569 TLAB_FIELD_OFFSET(end)
570 TLAB_FIELD_OFFSET(top)
571 TLAB_FIELD_OFFSET(pf_top)
572 TLAB_FIELD_OFFSET(size) // desired_size
573 TLAB_FIELD_OFFSET(refill_waste_limit)
574 TLAB_FIELD_OFFSET(number_of_refills)
575 TLAB_FIELD_OFFSET(fast_refill_waste)
576 TLAB_FIELD_OFFSET(slow_allocations)
578 #undef TLAB_FIELD_OFFSET
580 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
582 public:
583 volatile intptr_t _Stalled ;
584 volatile int _TypeTag ;
585 ParkEvent * _ParkEvent ; // for synchronized()
586 ParkEvent * _SleepEvent ; // for Thread.sleep
587 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
588 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
589 int NativeSyncRecursion ; // diagnostic
591 volatile int _OnTrap ; // Resume-at IP delta
592 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
593 jint _hashStateX ; // thread-specific hashCode generator state
594 jint _hashStateY ;
595 jint _hashStateZ ;
596 void * _schedctl ;
598 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code
599 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); }
600 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); }
602 volatile jint rng [4] ; // RNG for spin loop
604 // Low-level leaf-lock primitives used to implement synchronization
605 // and native monitor-mutex infrastructure.
606 // Not for general synchronization use.
607 static void SpinAcquire (volatile int * Lock, const char * Name) ;
608 static void SpinRelease (volatile int * Lock) ;
609 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
610 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
611 static void muxRelease (volatile intptr_t * Lock) ;
612 };
614 // Inline implementation of Thread::current()
615 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
616 // startup.
617 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
618 // period. This is inlined in thread_<os_family>.inline.hpp.
620 inline Thread* Thread::current() {
621 #ifdef ASSERT
622 // This function is very high traffic. Define PARANOID to enable expensive
623 // asserts.
624 #ifdef PARANOID
625 // Signal handler should call ThreadLocalStorage::get_thread_slow()
626 Thread* t = ThreadLocalStorage::get_thread_slow();
627 assert(t != NULL && !t->is_inside_signal_handler(),
628 "Don't use Thread::current() inside signal handler");
629 #endif
630 #endif
631 Thread* thread = ThreadLocalStorage::thread();
632 assert(thread != NULL, "just checking");
633 return thread;
634 }
636 // Name support for threads. non-JavaThread subclasses with multiple
637 // uniquely named instances should derive from this.
638 class NamedThread: public Thread {
639 friend class VMStructs;
640 enum {
641 max_name_len = 64
642 };
643 private:
644 char* _name;
645 // log JavaThread being processed by oops_do
646 JavaThread* _processed_thread;
648 public:
649 NamedThread();
650 ~NamedThread();
651 // May only be called once per thread.
652 void set_name(const char* format, ...);
653 virtual bool is_Named_thread() const { return true; }
654 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
655 JavaThread *processed_thread() { return _processed_thread; }
656 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
657 };
659 // Worker threads are named and have an id of an assigned work.
660 class WorkerThread: public NamedThread {
661 private:
662 uint _id;
663 public:
664 WorkerThread() : _id(0) { }
665 virtual bool is_Worker_thread() const { return true; }
667 virtual WorkerThread* as_Worker_thread() const {
668 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
669 return (WorkerThread*) this;
670 }
672 void set_id(uint work_id) { _id = work_id; }
673 uint id() const { return _id; }
674 };
676 // A single WatcherThread is used for simulating timer interrupts.
677 class WatcherThread: public Thread {
678 friend class VMStructs;
679 public:
680 virtual void run();
682 private:
683 static WatcherThread* _watcher_thread;
685 volatile static bool _should_terminate; // updated without holding lock
686 public:
687 enum SomeConstants {
688 delay_interval = 10 // interrupt delay in milliseconds
689 };
691 // Constructor
692 WatcherThread();
694 // Tester
695 bool is_Watcher_thread() const { return true; }
697 // Printing
698 char* name() const { return (char*)"VM Periodic Task Thread"; }
699 void print_on(outputStream* st) const;
700 void print() const { print_on(tty); }
702 // Returns the single instance of WatcherThread
703 static WatcherThread* watcher_thread() { return _watcher_thread; }
705 // Create and start the single instance of WatcherThread, or stop it on shutdown
706 static void start();
707 static void stop();
708 };
711 class CompilerThread;
713 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
715 class JavaThread: public Thread {
716 friend class VMStructs;
717 private:
718 JavaThread* _next; // The next thread in the Threads list
719 oop _threadObj; // The Java level thread object
721 #ifdef ASSERT
722 private:
723 int _java_call_counter;
725 public:
726 int java_call_counter() { return _java_call_counter; }
727 void inc_java_call_counter() { _java_call_counter++; }
728 void dec_java_call_counter() {
729 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
730 _java_call_counter--;
731 }
732 private: // restore original namespace restriction
733 #endif // ifdef ASSERT
735 #ifndef PRODUCT
736 public:
737 enum {
738 jump_ring_buffer_size = 16
739 };
740 private: // restore original namespace restriction
741 #endif
743 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
745 ThreadFunction _entry_point;
747 JNIEnv _jni_environment;
749 // Deopt support
750 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
752 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
753 // transition out of native
754 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
755 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
756 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
757 // Because deoptimization is lazy we must save jvmti requests to set locals
758 // in compiled frames until we deoptimize and we have an interpreter frame.
759 // This holds the pointer to array (yeah like there might be more than one) of
760 // description of compiled vframes that have locals that need to be updated.
761 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
763 // Handshake value for fixing 6243940. We need a place for the i2c
764 // adapter to store the callee methodOop. This value is NEVER live
765 // across a gc point so it does NOT have to be gc'd
766 // The handshake is open ended since we can't be certain that it will
767 // be NULLed. This is because we rarely ever see the race and end up
768 // in handle_wrong_method which is the backend of the handshake. See
769 // code in i2c adapters and handle_wrong_method.
771 methodOop _callee_target;
773 // Oop results of VM runtime calls
774 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved
775 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved
777 // See ReduceInitialCardMarks: this holds the precise space interval of
778 // the most recent slow path allocation for which compiled code has
779 // elided card-marks for performance along the fast-path.
780 MemRegion _deferred_card_mark;
782 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
783 // allocated during deoptimization
784 // and by JNI_MonitorEnter/Exit
786 // Async. requests support
787 enum AsyncRequests {
788 _no_async_condition = 0,
789 _async_exception,
790 _async_unsafe_access_error
791 };
792 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
793 oop _pending_async_exception;
795 // Safepoint support
796 public: // Expose _thread_state for SafeFetchInt()
797 volatile JavaThreadState _thread_state;
798 private:
799 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
800 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
802 // JavaThread termination support
803 enum TerminatedTypes {
804 _not_terminated = 0xDEAD - 2,
805 _thread_exiting, // JavaThread::exit() has been called for this thread
806 _thread_terminated, // JavaThread is removed from thread list
807 _vm_exited // JavaThread is still executing native code, but VM is terminated
808 // only VM_Exit can set _vm_exited
809 };
811 // In general a JavaThread's _terminated field transitions as follows:
812 //
813 // _not_terminated => _thread_exiting => _thread_terminated
814 //
815 // _vm_exited is a special value to cover the case of a JavaThread
816 // executing native code after the VM itself is terminated.
817 volatile TerminatedTypes _terminated;
818 // suspend/resume support
819 volatile bool _suspend_equivalent; // Suspend equivalent condition
820 jint _in_deopt_handler; // count of deoptimization
821 // handlers thread is in
822 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
823 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
824 // never locked) when throwing an exception. Used by interpreter only.
826 // JNI attach states:
827 enum JNIAttachStates {
828 _not_attaching_via_jni = 1, // thread is not attaching via JNI
829 _attaching_via_jni, // thread is attaching via JNI
830 _attached_via_jni // thread has attached via JNI
831 };
833 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
834 // A native thread that is attaching via JNI starts with a value
835 // of _attaching_via_jni and transitions to _attached_via_jni.
836 volatile JNIAttachStates _jni_attach_state;
838 public:
839 // State of the stack guard pages for this thread.
840 enum StackGuardState {
841 stack_guard_unused, // not needed
842 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
843 stack_guard_enabled // enabled
844 };
846 private:
848 StackGuardState _stack_guard_state;
850 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
851 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
852 // code)
853 volatile oop _exception_oop; // Exception thrown in compiled code
854 volatile address _exception_pc; // PC where exception happened
855 volatile address _exception_handler_pc; // PC for handler of exception
856 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
858 // support for compilation
859 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
861 // support for JNI critical regions
862 jint _jni_active_critical; // count of entries into JNI critical region
864 // For deadlock detection.
865 int _depth_first_number;
867 // JVMTI PopFrame support
868 // This is set to popframe_pending to signal that top Java frame should be popped immediately
869 int _popframe_condition;
871 #ifndef PRODUCT
872 int _jmp_ring_index;
873 struct {
874 // We use intptr_t instead of address so debugger doesn't try and display strings
875 intptr_t _target;
876 intptr_t _instruction;
877 const char* _file;
878 int _line;
879 } _jmp_ring[ jump_ring_buffer_size ];
880 #endif /* PRODUCT */
882 #ifndef SERIALGC
883 // Support for G1 barriers
885 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
886 // Set of all such queues.
887 static SATBMarkQueueSet _satb_mark_queue_set;
889 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
890 // Set of all such queues.
891 static DirtyCardQueueSet _dirty_card_queue_set;
893 void flush_barrier_queues();
894 #endif // !SERIALGC
896 friend class VMThread;
897 friend class ThreadWaitTransition;
898 friend class VM_Exit;
900 void initialize(); // Initialized the instance variables
902 public:
903 // Constructor
904 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
905 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
906 ~JavaThread();
908 #ifdef ASSERT
909 // verify this JavaThread hasn't be published in the Threads::list yet
910 void verify_not_published();
911 #endif
913 //JNI functiontable getter/setter for JVMTI jni function table interception API.
914 void set_jni_functions(struct JNINativeInterface_* functionTable) {
915 _jni_environment.functions = functionTable;
916 }
917 struct JNINativeInterface_* get_jni_functions() {
918 return (struct JNINativeInterface_ *)_jni_environment.functions;
919 }
921 // This function is called at thread creation to allow
922 // platform specific thread variables to be initialized.
923 void cache_global_variables();
925 // Executes Shutdown.shutdown()
926 void invoke_shutdown_hooks();
928 // Cleanup on thread exit
929 enum ExitType {
930 normal_exit,
931 jni_detach
932 };
933 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
935 void cleanup_failed_attach_current_thread();
937 // Testers
938 virtual bool is_Java_thread() const { return true; }
940 // compilation
941 void set_is_compiling(bool f) { _is_compiling = f; }
942 bool is_compiling() const { return _is_compiling; }
944 // Thread chain operations
945 JavaThread* next() const { return _next; }
946 void set_next(JavaThread* p) { _next = p; }
948 // Thread oop. threadObj() can be NULL for initial JavaThread
949 // (or for threads attached via JNI)
950 oop threadObj() const { return _threadObj; }
951 void set_threadObj(oop p) { _threadObj = p; }
953 ThreadPriority java_priority() const; // Read from threadObj()
955 // Prepare thread and add to priority queue. If a priority is
956 // not specified, use the priority of the thread object. Threads_lock
957 // must be held while this function is called.
958 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
960 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
961 address saved_exception_pc() { return _saved_exception_pc; }
964 ThreadFunction entry_point() const { return _entry_point; }
966 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
967 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
969 // Last frame anchor routines
971 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
973 // last_Java_sp
974 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
975 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
977 // last_Java_pc
979 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
981 // Safepoint support
982 JavaThreadState thread_state() const { return _thread_state; }
983 void set_thread_state(JavaThreadState s) { _thread_state=s; }
984 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
985 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
986 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
988 // thread has called JavaThread::exit() or is terminated
989 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
990 // thread is terminated (no longer on the threads list); we compare
991 // against the two non-terminated values so that a freed JavaThread
992 // will also be considered terminated.
993 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
994 void set_terminated(TerminatedTypes t) { _terminated = t; }
995 // special for Threads::remove() which is static:
996 void set_terminated_value() { _terminated = _thread_terminated; }
997 void block_if_vm_exited();
999 bool doing_unsafe_access() { return _doing_unsafe_access; }
1000 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1002 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1003 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1006 // Suspend/resume support for JavaThread
1008 private:
1009 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1010 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1012 public:
1013 void java_suspend();
1014 void java_resume();
1015 int java_suspend_self();
1017 void check_and_wait_while_suspended() {
1018 assert(JavaThread::current() == this, "sanity check");
1020 bool do_self_suspend;
1021 do {
1022 // were we externally suspended while we were waiting?
1023 do_self_suspend = handle_special_suspend_equivalent_condition();
1024 if (do_self_suspend) {
1025 // don't surprise the thread that suspended us by returning
1026 java_suspend_self();
1027 set_suspend_equivalent();
1028 }
1029 } while (do_self_suspend);
1030 }
1031 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1032 // Check for async exception in addition to safepoint and suspend request.
1033 static void check_special_condition_for_native_trans(JavaThread *thread);
1035 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1036 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1037 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1038 // Warning: is_ext_suspend_completed() may temporarily drop the
1039 // SR_lock to allow the thread to reach a stable thread state if
1040 // it is currently in a transient thread state.
1041 return is_ext_suspend_completed(false /*!called_by_wait */,
1042 SuspendRetryDelay, bits);
1043 }
1045 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1046 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1047 // passed as the count and delay parameters. Experiments with specific
1048 // calls to wait_for_ext_suspend_completion() can be done by passing
1049 // other values in the code. Experiments with all calls can be done
1050 // via the appropriate -XX options.
1051 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1053 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1054 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1056 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1057 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1058 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1060 bool is_external_suspend() const {
1061 return (_suspend_flags & _external_suspend) != 0;
1062 }
1063 // Whenever a thread transitions from native to vm/java it must suspend
1064 // if external|deopt suspend is present.
1065 bool is_suspend_after_native() const {
1066 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1067 }
1069 // external suspend request is completed
1070 bool is_ext_suspended() const {
1071 return (_suspend_flags & _ext_suspended) != 0;
1072 }
1074 bool is_external_suspend_with_lock() const {
1075 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1076 return is_external_suspend();
1077 }
1079 // Special method to handle a pending external suspend request
1080 // when a suspend equivalent condition lifts.
1081 bool handle_special_suspend_equivalent_condition() {
1082 assert(is_suspend_equivalent(),
1083 "should only be called in a suspend equivalence condition");
1084 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1085 bool ret = is_external_suspend();
1086 if (!ret) {
1087 // not about to self-suspend so clear suspend equivalence
1088 clear_suspend_equivalent();
1089 }
1090 // implied else:
1091 // We have a pending external suspend request so we leave the
1092 // suspend_equivalent flag set until java_suspend_self() sets
1093 // the ext_suspended flag and clears the suspend_equivalent
1094 // flag. This insures that wait_for_ext_suspend_completion()
1095 // will return consistent values.
1096 return ret;
1097 }
1099 // utility methods to see if we are doing some kind of suspension
1100 bool is_being_ext_suspended() const {
1101 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1102 return is_ext_suspended() || is_external_suspend();
1103 }
1105 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1107 void set_suspend_equivalent() { _suspend_equivalent = true; };
1108 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1110 // Thread.stop support
1111 void send_thread_stop(oop throwable);
1112 AsyncRequests clear_special_runtime_exit_condition() {
1113 AsyncRequests x = _special_runtime_exit_condition;
1114 _special_runtime_exit_condition = _no_async_condition;
1115 return x;
1116 }
1118 // Are any async conditions present?
1119 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1121 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1123 // these next two are also used for self-suspension and async exception support
1124 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1126 // Return true if JavaThread has an asynchronous condition or
1127 // if external suspension is requested.
1128 bool has_special_runtime_exit_condition() {
1129 // We call is_external_suspend() last since external suspend should
1130 // be less common. Because we don't use is_external_suspend_with_lock
1131 // it is possible that we won't see an asynchronous external suspend
1132 // request that has just gotten started, i.e., SR_lock grabbed but
1133 // _external_suspend field change either not made yet or not visible
1134 // yet. However, this is okay because the request is asynchronous and
1135 // we will see the new flag value the next time through. It's also
1136 // possible that the external suspend request is dropped after
1137 // we have checked is_external_suspend(), we will recheck its value
1138 // under SR_lock in java_suspend_self().
1139 return (_special_runtime_exit_condition != _no_async_condition) ||
1140 is_external_suspend() || is_deopt_suspend();
1141 }
1143 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1145 void set_pending_async_exception(oop e) {
1146 _pending_async_exception = e;
1147 _special_runtime_exit_condition = _async_exception;
1148 set_has_async_exception();
1149 }
1151 // Fast-locking support
1152 bool is_lock_owned(address adr) const;
1154 // Accessors for vframe array top
1155 // The linked list of vframe arrays are sorted on sp. This means when we
1156 // unpack the head must contain the vframe array to unpack.
1157 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1158 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1160 // Side structure for defering update of java frame locals until deopt occurs
1161 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1162 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1164 // These only really exist to make debugging deopt problems simpler
1166 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1167 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1169 // The special resourceMark used during deoptimization
1171 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1172 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1174 intptr_t* must_deopt_id() { return _must_deopt_id; }
1175 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1176 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1178 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1179 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1181 methodOop callee_target() const { return _callee_target; }
1182 void set_callee_target (methodOop x) { _callee_target = x; }
1184 // Oop results of vm runtime calls
1185 oop vm_result() const { return _vm_result; }
1186 void set_vm_result (oop x) { _vm_result = x; }
1188 oop vm_result_2() const { return _vm_result_2; }
1189 void set_vm_result_2 (oop x) { _vm_result_2 = x; }
1191 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1192 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1194 // Exception handling for compiled methods
1195 oop exception_oop() const { return _exception_oop; }
1196 address exception_pc() const { return _exception_pc; }
1197 address exception_handler_pc() const { return _exception_handler_pc; }
1198 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1200 void set_exception_oop(oop o) { _exception_oop = o; }
1201 void set_exception_pc(address a) { _exception_pc = a; }
1202 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1203 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1205 // Stack overflow support
1206 inline size_t stack_available(address cur_sp);
1207 address stack_yellow_zone_base()
1208 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1209 size_t stack_yellow_zone_size()
1210 { return StackYellowPages * os::vm_page_size(); }
1211 address stack_red_zone_base()
1212 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1213 size_t stack_red_zone_size()
1214 { return StackRedPages * os::vm_page_size(); }
1215 bool in_stack_yellow_zone(address a)
1216 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1217 bool in_stack_red_zone(address a)
1218 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1220 void create_stack_guard_pages();
1221 void remove_stack_guard_pages();
1223 void enable_stack_yellow_zone();
1224 void disable_stack_yellow_zone();
1225 void enable_stack_red_zone();
1226 void disable_stack_red_zone();
1228 inline bool stack_yellow_zone_disabled();
1229 inline bool stack_yellow_zone_enabled();
1231 // Attempt to reguard the stack after a stack overflow may have occurred.
1232 // Returns true if (a) guard pages are not needed on this thread, (b) the
1233 // pages are already guarded, or (c) the pages were successfully reguarded.
1234 // Returns false if there is not enough stack space to reguard the pages, in
1235 // which case the caller should unwind a frame and try again. The argument
1236 // should be the caller's (approximate) sp.
1237 bool reguard_stack(address cur_sp);
1238 // Similar to above but see if current stackpoint is out of the guard area
1239 // and reguard if possible.
1240 bool reguard_stack(void);
1242 // Misc. accessors/mutators
1243 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1244 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1245 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1247 #ifndef PRODUCT
1248 void record_jump(address target, address instr, const char* file, int line);
1249 #endif /* PRODUCT */
1251 // For assembly stub generation
1252 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1253 #ifndef PRODUCT
1254 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1255 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1256 #endif /* PRODUCT */
1257 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1258 static ByteSize last_Java_sp_offset() {
1259 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1260 }
1261 static ByteSize last_Java_pc_offset() {
1262 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1263 }
1264 static ByteSize frame_anchor_offset() {
1265 return byte_offset_of(JavaThread, _anchor);
1266 }
1267 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1268 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1269 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1270 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1271 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1272 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1273 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1274 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1275 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1276 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1277 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1278 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1280 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1281 static ByteSize should_post_on_exceptions_flag_offset() {
1282 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1283 }
1285 #ifndef SERIALGC
1286 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1287 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1288 #endif // !SERIALGC
1290 // Returns the jni environment for this thread
1291 JNIEnv* jni_environment() { return &_jni_environment; }
1293 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1294 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1295 // Only return NULL if thread is off the thread list; starting to
1296 // exit should not return NULL.
1297 if (thread_from_jni_env->is_terminated()) {
1298 thread_from_jni_env->block_if_vm_exited();
1299 return NULL;
1300 } else {
1301 return thread_from_jni_env;
1302 }
1303 }
1305 // JNI critical regions. These can nest.
1306 bool in_critical() { return _jni_active_critical > 0; }
1307 void enter_critical() { assert(Thread::current() == this,
1308 "this must be current thread");
1309 _jni_active_critical++; }
1310 void exit_critical() { assert(Thread::current() == this,
1311 "this must be current thread");
1312 _jni_active_critical--;
1313 assert(_jni_active_critical >= 0,
1314 "JNI critical nesting problem?"); }
1316 // For deadlock detection
1317 int depth_first_number() { return _depth_first_number; }
1318 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1320 private:
1321 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1323 public:
1324 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1325 void add_monitor_chunk(MonitorChunk* chunk);
1326 void remove_monitor_chunk(MonitorChunk* chunk);
1327 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1328 void inc_in_deopt_handler() { _in_deopt_handler++; }
1329 void dec_in_deopt_handler() {
1330 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1331 if (_in_deopt_handler > 0) { // robustness
1332 _in_deopt_handler--;
1333 }
1334 }
1336 private:
1337 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1339 public:
1341 // Frame iteration; calls the function f for all frames on the stack
1342 void frames_do(void f(frame*, const RegisterMap*));
1344 // Memory operations
1345 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1347 // Sweeper operations
1348 void nmethods_do(CodeBlobClosure* cf);
1350 // Memory management operations
1351 void gc_epilogue();
1352 void gc_prologue();
1354 // Misc. operations
1355 char* name() const { return (char*)get_thread_name(); }
1356 void print_on(outputStream* st) const;
1357 void print() const { print_on(tty); }
1358 void print_value();
1359 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1360 void print_thread_state() const PRODUCT_RETURN;
1361 void print_on_error(outputStream* st, char* buf, int buflen) const;
1362 void verify();
1363 const char* get_thread_name() const;
1364 private:
1365 // factor out low-level mechanics for use in both normal and error cases
1366 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1367 public:
1368 const char* get_threadgroup_name() const;
1369 const char* get_parent_name() const;
1371 // Accessing frames
1372 frame last_frame() {
1373 _anchor.make_walkable(this);
1374 return pd_last_frame();
1375 }
1376 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1378 // Returns method at 'depth' java or native frames down the stack
1379 // Used for security checks
1380 klassOop security_get_caller_class(int depth);
1382 // Print stack trace in external format
1383 void print_stack_on(outputStream* st);
1384 void print_stack() { print_stack_on(tty); }
1386 // Print stack traces in various internal formats
1387 void trace_stack() PRODUCT_RETURN;
1388 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1389 void trace_frames() PRODUCT_RETURN;
1390 void trace_oops() PRODUCT_RETURN;
1392 // Print an annotated view of the stack frames
1393 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1394 void validate_frame_layout() {
1395 print_frame_layout(0, true);
1396 }
1398 // Returns the number of stack frames on the stack
1399 int depth() const;
1401 // Function for testing deoptimization
1402 void deoptimize();
1403 void make_zombies();
1405 void deoptimized_wrt_marked_nmethods();
1407 // Profiling operation (see fprofile.cpp)
1408 public:
1409 bool profile_last_Java_frame(frame* fr);
1411 private:
1412 ThreadProfiler* _thread_profiler;
1413 private:
1414 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1415 friend class FlatProfilerTask; // uses get_thread_profiler.
1416 friend class ThreadProfilerMark; // uses get_thread_profiler.
1417 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1418 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1419 ThreadProfiler* result = _thread_profiler;
1420 _thread_profiler = tp;
1421 return result;
1422 }
1424 // Static operations
1425 public:
1426 // Returns the running thread as a JavaThread
1427 static inline JavaThread* current();
1429 // Returns the active Java thread. Do not use this if you know you are calling
1430 // from a JavaThread, as it's slower than JavaThread::current. If called from
1431 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1432 // operation. You may not want that either.
1433 static JavaThread* active();
1435 inline CompilerThread* as_CompilerThread();
1437 public:
1438 virtual void run();
1439 void thread_main_inner();
1441 private:
1442 // PRIVILEGED STACK
1443 PrivilegedElement* _privileged_stack_top;
1444 GrowableArray<oop>* _array_for_gc;
1445 public:
1447 // Returns the privileged_stack information.
1448 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1449 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1450 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1452 public:
1453 // Thread local information maintained by JVMTI.
1454 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1455 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1456 // getter is used to get this JavaThread's JvmtiThreadState if it has
1457 // one which means NULL can be returned. JvmtiThreadState::state_for()
1458 // is used to get the specified JavaThread's JvmtiThreadState if it has
1459 // one or it allocates a new JvmtiThreadState for the JavaThread and
1460 // returns it. JvmtiThreadState::state_for() will return NULL only if
1461 // the specified JavaThread is exiting.
1462 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1463 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1464 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1465 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1467 // JVMTI PopFrame support
1468 // Setting and clearing popframe_condition
1469 // All of these enumerated values are bits. popframe_pending
1470 // indicates that a PopFrame() has been requested and not yet been
1471 // completed. popframe_processing indicates that that PopFrame() is in
1472 // the process of being completed. popframe_force_deopt_reexecution_bit
1473 // indicates that special handling is required when returning to a
1474 // deoptimized caller.
1475 enum PopCondition {
1476 popframe_inactive = 0x00,
1477 popframe_pending_bit = 0x01,
1478 popframe_processing_bit = 0x02,
1479 popframe_force_deopt_reexecution_bit = 0x04
1480 };
1481 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1482 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1483 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1484 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1485 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1486 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1487 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1488 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1489 #ifdef CC_INTERP
1490 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1491 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1492 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1493 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1494 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1495 #endif
1497 private:
1498 // Saved incoming arguments to popped frame.
1499 // Used only when popped interpreted frame returns to deoptimized frame.
1500 void* _popframe_preserved_args;
1501 int _popframe_preserved_args_size;
1503 public:
1504 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1505 void* popframe_preserved_args();
1506 ByteSize popframe_preserved_args_size();
1507 WordSize popframe_preserved_args_size_in_words();
1508 void popframe_free_preserved_args();
1511 private:
1512 JvmtiThreadState *_jvmti_thread_state;
1513 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1515 // Used by the interpreter in fullspeed mode for frame pop, method
1516 // entry, method exit and single stepping support. This field is
1517 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1518 // It can be set to zero asynchronously (i.e., without a VM operation
1519 // or a lock) so we have to be very careful.
1520 int _interp_only_mode;
1522 public:
1523 // used by the interpreter for fullspeed debugging support (see above)
1524 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1525 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1526 int get_interp_only_mode() { return _interp_only_mode; }
1527 void increment_interp_only_mode() { ++_interp_only_mode; }
1528 void decrement_interp_only_mode() { --_interp_only_mode; }
1530 // support for cached flag that indicates whether exceptions need to be posted for this thread
1531 // if this is false, we can avoid deoptimizing when events are thrown
1532 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1533 private:
1534 int _should_post_on_exceptions_flag;
1536 public:
1537 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1538 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1540 private:
1541 ThreadStatistics *_thread_stat;
1543 public:
1544 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1546 // Return a blocker object for which this thread is blocked parking.
1547 oop current_park_blocker();
1549 private:
1550 static size_t _stack_size_at_create;
1552 public:
1553 static inline size_t stack_size_at_create(void) {
1554 return _stack_size_at_create;
1555 }
1556 static inline void set_stack_size_at_create(size_t value) {
1557 _stack_size_at_create = value;
1558 }
1560 #ifndef SERIALGC
1561 // SATB marking queue support
1562 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1563 static SATBMarkQueueSet& satb_mark_queue_set() {
1564 return _satb_mark_queue_set;
1565 }
1567 // Dirty card queue support
1568 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1569 static DirtyCardQueueSet& dirty_card_queue_set() {
1570 return _dirty_card_queue_set;
1571 }
1572 #endif // !SERIALGC
1574 // This method initializes the SATB and dirty card queues before a
1575 // JavaThread is added to the Java thread list. Right now, we don't
1576 // have to do anything to the dirty card queue (it should have been
1577 // activated when the thread was created), but we have to activate
1578 // the SATB queue if the thread is created while a marking cycle is
1579 // in progress. The activation / de-activation of the SATB queues at
1580 // the beginning / end of a marking cycle is done during safepoints
1581 // so we have to make sure this method is called outside one to be
1582 // able to safely read the active field of the SATB queue set. Right
1583 // now, it is called just before the thread is added to the Java
1584 // thread list in the Threads::add() method. That method is holding
1585 // the Threads_lock which ensures we are outside a safepoint. We
1586 // cannot do the obvious and set the active field of the SATB queue
1587 // when the thread is created given that, in some cases, safepoints
1588 // might happen between the JavaThread constructor being called and the
1589 // thread being added to the Java thread list (an example of this is
1590 // when the structure for the DestroyJavaVM thread is created).
1591 #ifndef SERIALGC
1592 void initialize_queues();
1593 #else // !SERIALGC
1594 void initialize_queues() { }
1595 #endif // !SERIALGC
1597 // Machine dependent stuff
1598 #ifdef TARGET_OS_ARCH_linux_x86
1599 # include "thread_linux_x86.hpp"
1600 #endif
1601 #ifdef TARGET_OS_ARCH_linux_sparc
1602 # include "thread_linux_sparc.hpp"
1603 #endif
1604 #ifdef TARGET_OS_ARCH_linux_zero
1605 # include "thread_linux_zero.hpp"
1606 #endif
1607 #ifdef TARGET_OS_ARCH_solaris_x86
1608 # include "thread_solaris_x86.hpp"
1609 #endif
1610 #ifdef TARGET_OS_ARCH_solaris_sparc
1611 # include "thread_solaris_sparc.hpp"
1612 #endif
1613 #ifdef TARGET_OS_ARCH_windows_x86
1614 # include "thread_windows_x86.hpp"
1615 #endif
1616 #ifdef TARGET_OS_ARCH_linux_arm
1617 # include "thread_linux_arm.hpp"
1618 #endif
1619 #ifdef TARGET_OS_ARCH_linux_ppc
1620 # include "thread_linux_ppc.hpp"
1621 #endif
1622 #ifdef TARGET_OS_ARCH_bsd_x86
1623 # include "thread_bsd_x86.hpp"
1624 #endif
1625 #ifdef TARGET_OS_ARCH_bsd_zero
1626 # include "thread_bsd_zero.hpp"
1627 #endif
1630 public:
1631 void set_blocked_on_compilation(bool value) {
1632 _blocked_on_compilation = value;
1633 }
1635 bool blocked_on_compilation() {
1636 return _blocked_on_compilation;
1637 }
1638 protected:
1639 bool _blocked_on_compilation;
1642 // JSR166 per-thread parker
1643 private:
1644 Parker* _parker;
1645 public:
1646 Parker* parker() { return _parker; }
1648 // Biased locking support
1649 private:
1650 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1651 public:
1652 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1653 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1655 // clearing/querying jni attach status
1656 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1657 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1658 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); }
1659 private:
1660 // This field is used to determine if a thread has claimed
1661 // a par_id: it is -1 if the thread has not claimed a par_id;
1662 // otherwise its value is the par_id that has been claimed.
1663 int _claimed_par_id;
1664 public:
1665 int get_claimed_par_id() { return _claimed_par_id; }
1666 void set_claimed_par_id(int id) { _claimed_par_id = id;}
1667 };
1669 // Inline implementation of JavaThread::current
1670 inline JavaThread* JavaThread::current() {
1671 Thread* thread = ThreadLocalStorage::thread();
1672 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1673 return (JavaThread*)thread;
1674 }
1676 inline CompilerThread* JavaThread::as_CompilerThread() {
1677 assert(is_Compiler_thread(), "just checking");
1678 return (CompilerThread*)this;
1679 }
1681 inline bool JavaThread::stack_yellow_zone_disabled() {
1682 return _stack_guard_state == stack_guard_yellow_disabled;
1683 }
1685 inline bool JavaThread::stack_yellow_zone_enabled() {
1686 #ifdef ASSERT
1687 if (os::uses_stack_guard_pages()) {
1688 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1689 }
1690 #endif
1691 return _stack_guard_state == stack_guard_enabled;
1692 }
1694 inline size_t JavaThread::stack_available(address cur_sp) {
1695 // This code assumes java stacks grow down
1696 address low_addr; // Limit on the address for deepest stack depth
1697 if ( _stack_guard_state == stack_guard_unused) {
1698 low_addr = stack_base() - stack_size();
1699 } else {
1700 low_addr = stack_yellow_zone_base();
1701 }
1702 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1703 }
1705 // A thread used for Compilation.
1706 class CompilerThread : public JavaThread {
1707 friend class VMStructs;
1708 private:
1709 CompilerCounters* _counters;
1711 ciEnv* _env;
1712 CompileLog* _log;
1713 CompileTask* _task;
1714 CompileQueue* _queue;
1715 BufferBlob* _buffer_blob;
1717 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1719 public:
1721 static CompilerThread* current();
1723 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1725 bool is_Compiler_thread() const { return true; }
1726 // Hide this compiler thread from external view.
1727 bool is_hidden_from_external_view() const { return true; }
1729 CompileQueue* queue() { return _queue; }
1730 CompilerCounters* counters() { return _counters; }
1732 // Get/set the thread's compilation environment.
1733 ciEnv* env() { return _env; }
1734 void set_env(ciEnv* env) { _env = env; }
1736 BufferBlob* get_buffer_blob() { return _buffer_blob; }
1737 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1739 // Get/set the thread's logging information
1740 CompileLog* log() { return _log; }
1741 void init_log(CompileLog* log) {
1742 // Set once, for good.
1743 assert(_log == NULL, "set only once");
1744 _log = log;
1745 }
1747 // GC support
1748 // Apply "f->do_oop" to all root oops in "this".
1749 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1750 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1752 #ifndef PRODUCT
1753 private:
1754 IdealGraphPrinter *_ideal_graph_printer;
1755 public:
1756 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1757 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1758 #endif
1760 // Get/set the thread's current task
1761 CompileTask* task() { return _task; }
1762 void set_task(CompileTask* task) { _task = task; }
1764 // Track the nmethod currently being scanned by the sweeper
1765 void set_scanned_nmethod(nmethod* nm) {
1766 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1767 _scanned_nmethod = nm;
1768 }
1769 };
1771 inline CompilerThread* CompilerThread::current() {
1772 return JavaThread::current()->as_CompilerThread();
1773 }
1776 // The active thread queue. It also keeps track of the current used
1777 // thread priorities.
1778 class Threads: AllStatic {
1779 friend class VMStructs;
1780 private:
1781 static JavaThread* _thread_list;
1782 static int _number_of_threads;
1783 static int _number_of_non_daemon_threads;
1784 static int _return_code;
1786 public:
1787 // Thread management
1788 // force_daemon is a concession to JNI, where we may need to add a
1789 // thread to the thread list before allocating its thread object
1790 static void add(JavaThread* p, bool force_daemon = false);
1791 static void remove(JavaThread* p);
1792 static bool includes(JavaThread* p);
1793 static JavaThread* first() { return _thread_list; }
1794 static void threads_do(ThreadClosure* tc);
1796 // Initializes the vm and creates the vm thread
1797 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1798 static void convert_vm_init_libraries_to_agents();
1799 static void create_vm_init_libraries();
1800 static void create_vm_init_agents();
1801 static void shutdown_vm_agents();
1802 static bool destroy_vm();
1803 // Supported VM versions via JNI
1804 // Includes JNI_VERSION_1_1
1805 static jboolean is_supported_jni_version_including_1_1(jint version);
1806 // Does not include JNI_VERSION_1_1
1807 static jboolean is_supported_jni_version(jint version);
1809 // Garbage collection
1810 static void follow_other_roots(void f(oop*));
1812 // Apply "f->do_oop" to all root oops in all threads.
1813 // This version may only be called by sequential code.
1814 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
1815 // This version may be called by sequential or parallel code.
1816 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf);
1817 // This creates a list of GCTasks, one per thread.
1818 static void create_thread_roots_tasks(GCTaskQueue* q);
1819 // This creates a list of GCTasks, one per thread, for marking objects.
1820 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1822 // Apply "f->do_oop" to roots in all threads that
1823 // are part of compiled frames
1824 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1826 static void convert_hcode_pointers();
1827 static void restore_hcode_pointers();
1829 // Sweeper
1830 static void nmethods_do(CodeBlobClosure* cf);
1832 static void gc_epilogue();
1833 static void gc_prologue();
1835 // Verification
1836 static void verify();
1837 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1838 static void print(bool print_stacks, bool internal_format) {
1839 // this function is only used by debug.cpp
1840 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1841 }
1842 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1844 // Get Java threads that are waiting to enter a monitor. If doLock
1845 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1846 // VM needs to be at a safepoint.
1847 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1848 address monitor, bool doLock);
1850 // Get owning Java thread from the monitor's owner field. If doLock
1851 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1852 // VM needs to be at a safepoint.
1853 static JavaThread *owning_thread_from_monitor_owner(address owner,
1854 bool doLock);
1856 // Number of threads on the active threads list
1857 static int number_of_threads() { return _number_of_threads; }
1858 // Number of non-daemon threads on the active threads list
1859 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1861 // Deoptimizes all frames tied to marked nmethods
1862 static void deoptimized_wrt_marked_nmethods();
1864 };
1867 // Thread iterator
1868 class ThreadClosure: public StackObj {
1869 public:
1870 virtual void do_thread(Thread* thread) = 0;
1871 };
1873 class SignalHandlerMark: public StackObj {
1874 private:
1875 Thread* _thread;
1876 public:
1877 SignalHandlerMark(Thread* t) {
1878 _thread = t;
1879 if (_thread) _thread->enter_signal_handler();
1880 }
1881 ~SignalHandlerMark() {
1882 if (_thread) _thread->leave_signal_handler();
1883 _thread = NULL;
1884 }
1885 };
1888 #endif // SHARE_VM_RUNTIME_THREAD_HPP