Wed, 15 Feb 2012 16:29:40 -0800
7142680: default GC affected by jvm path
Summary: Removed old tiered code
Reviewed-by: never, kvn
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 #define SHARE_VM_RUNTIME_THREAD_HPP
28 #include "memory/allocation.hpp"
29 #include "memory/threadLocalAllocBuffer.hpp"
30 #include "oops/oop.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvmtiExport.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/javaFrameAnchor.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/mutexLocker.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/osThread.hpp"
39 #include "runtime/park.hpp"
40 #include "runtime/safepoint.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "runtime/threadLocalStorage.hpp"
43 #include "runtime/unhandledOops.hpp"
44 #include "trace/tracing.hpp"
45 #include "utilities/exceptions.hpp"
46 #include "utilities/top.hpp"
47 #ifndef SERIALGC
48 #include "gc_implementation/g1/dirtyCardQueue.hpp"
49 #include "gc_implementation/g1/satbQueue.hpp"
50 #endif
51 #ifdef ZERO
52 #ifdef TARGET_ARCH_zero
53 # include "stack_zero.hpp"
54 #endif
55 #endif
57 class ThreadSafepointState;
58 class ThreadProfiler;
60 class JvmtiThreadState;
61 class JvmtiGetLoadedClassesClosure;
62 class ThreadStatistics;
63 class ConcurrentLocksDump;
64 class ParkEvent;
65 class Parker;
67 class ciEnv;
68 class CompileThread;
69 class CompileLog;
70 class CompileTask;
71 class CompileQueue;
72 class CompilerCounters;
73 class vframeArray;
75 class DeoptResourceMark;
76 class jvmtiDeferredLocalVariableSet;
78 class GCTaskQueue;
79 class ThreadClosure;
80 class IdealGraphPrinter;
82 class WorkerThread;
84 // Class hierarchy
85 // - Thread
86 // - NamedThread
87 // - VMThread
88 // - ConcurrentGCThread
89 // - WorkerThread
90 // - GangWorker
91 // - GCTaskThread
92 // - JavaThread
93 // - WatcherThread
95 class Thread: public ThreadShadow {
96 friend class VMStructs;
97 private:
98 // Exception handling
99 // (Note: _pending_exception and friends are in ThreadShadow)
100 //oop _pending_exception; // pending exception for current thread
101 // const char* _exception_file; // file information for exception (debugging only)
102 // int _exception_line; // line information for exception (debugging only)
104 // Support for forcing alignment of thread objects for biased locking
105 void* _real_malloc_address;
106 public:
107 void* operator new(size_t size);
108 void operator delete(void* p);
109 private:
111 // ***************************************************************
112 // Suspend and resume support
113 // ***************************************************************
114 //
115 // VM suspend/resume no longer exists - it was once used for various
116 // things including safepoints but was deprecated and finally removed
117 // in Java 7. Because VM suspension was considered "internal" Java-level
118 // suspension was considered "external", and this legacy naming scheme
119 // remains.
120 //
121 // External suspend/resume requests come from JVM_SuspendThread,
122 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
123 // ResumeThread. External
124 // suspend requests cause _external_suspend to be set and external
125 // resume requests cause _external_suspend to be cleared.
126 // External suspend requests do not nest on top of other external
127 // suspend requests. The higher level APIs reject suspend requests
128 // for already suspended threads.
129 //
130 // The external_suspend
131 // flag is checked by has_special_runtime_exit_condition() and java thread
132 // will self-suspend when handle_special_runtime_exit_condition() is
133 // called. Most uses of the _thread_blocked state in JavaThreads are
134 // considered the same as being externally suspended; if the blocking
135 // condition lifts, the JavaThread will self-suspend. Other places
136 // where VM checks for external_suspend include:
137 // + mutex granting (do not enter monitors when thread is suspended)
138 // + state transitions from _thread_in_native
139 //
140 // In general, java_suspend() does not wait for an external suspend
141 // request to complete. When it returns, the only guarantee is that
142 // the _external_suspend field is true.
143 //
144 // wait_for_ext_suspend_completion() is used to wait for an external
145 // suspend request to complete. External suspend requests are usually
146 // followed by some other interface call that requires the thread to
147 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
148 // the interface that requires quiescence, we give the JavaThread a
149 // chance to self-suspend before we need it to be quiescent. This
150 // improves overall suspend/query performance.
151 //
152 // _suspend_flags controls the behavior of java_ suspend/resume.
153 // It must be set under the protection of SR_lock. Read from the flag is
154 // OK without SR_lock as long as the value is only used as a hint.
155 // (e.g., check _external_suspend first without lock and then recheck
156 // inside SR_lock and finish the suspension)
157 //
158 // _suspend_flags is also overloaded for other "special conditions" so
159 // that a single check indicates whether any special action is needed
160 // eg. for async exceptions.
161 // -------------------------------------------------------------------
162 // Notes:
163 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
164 // but we still update its value to keep other part of the system (mainly
165 // JVMTI) happy. ThreadState is legacy code (see notes in
166 // osThread.hpp).
167 //
168 // 2. It would be more natural if set_external_suspend() is private and
169 // part of java_suspend(), but that probably would affect the suspend/query
170 // performance. Need more investigation on this.
171 //
173 // suspend/resume lock: used for self-suspend
174 Monitor* _SR_lock;
176 protected:
177 enum SuspendFlags {
178 // NOTE: avoid using the sign-bit as cc generates different test code
179 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
181 _external_suspend = 0x20000000U, // thread is asked to self suspend
182 _ext_suspended = 0x40000000U, // thread has self-suspended
183 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
185 _has_async_exception = 0x00000001U, // there is a pending async exception
186 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
187 };
189 // various suspension related flags - atomically updated
190 // overloaded for async exception checking in check_special_condition_for_native_trans.
191 volatile uint32_t _suspend_flags;
193 private:
194 int _num_nested_signal;
196 public:
197 void enter_signal_handler() { _num_nested_signal++; }
198 void leave_signal_handler() { _num_nested_signal--; }
199 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
201 private:
202 // Debug tracing
203 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
205 // Active_handles points to a block of handles
206 JNIHandleBlock* _active_handles;
208 // One-element thread local free list
209 JNIHandleBlock* _free_handle_block;
211 // Point to the last handle mark
212 HandleMark* _last_handle_mark;
214 // The parity of the last strong_roots iteration in which this thread was
215 // claimed as a task.
216 jint _oops_do_parity;
218 public:
219 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
220 HandleMark* last_handle_mark() const { return _last_handle_mark; }
221 private:
223 // debug support for checking if code does allow safepoints or not
224 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
225 // mutex, or blocking on an object synchronizer (Java locking).
226 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
227 // If !allow_allocation(), then an assertion failure will happen during allocation
228 // (Hence, !allow_safepoint() => !allow_allocation()).
229 //
230 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
231 //
232 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
233 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
235 // Used by SkipGCALot class.
236 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
238 // Record when GC is locked out via the GC_locker mechanism
239 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
241 friend class No_Alloc_Verifier;
242 friend class No_Safepoint_Verifier;
243 friend class Pause_No_Safepoint_Verifier;
244 friend class ThreadLocalStorage;
245 friend class GC_locker;
247 ThreadLocalAllocBuffer _tlab; // Thread-local eden
248 jlong _allocated_bytes; // Cumulative number of bytes allocated on
249 // the Java heap
251 TRACE_BUFFER _trace_buffer; // Thread-local buffer for tracing
253 int _vm_operation_started_count; // VM_Operation support
254 int _vm_operation_completed_count; // VM_Operation support
256 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
257 // is waiting to lock
258 bool _current_pending_monitor_is_from_java; // locking is from Java code
260 // ObjectMonitor on which this thread called Object.wait()
261 ObjectMonitor* _current_waiting_monitor;
263 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
264 public:
265 ObjectMonitor* omFreeList;
266 int omFreeCount; // length of omFreeList
267 int omFreeProvision; // reload chunk size
268 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
269 int omInUseCount; // length of omInUseList
271 public:
272 enum {
273 is_definitely_current_thread = true
274 };
276 // Constructor
277 Thread();
278 virtual ~Thread();
280 // initializtion
281 void initialize_thread_local_storage();
283 // thread entry point
284 virtual void run();
286 // Testers
287 virtual bool is_VM_thread() const { return false; }
288 virtual bool is_Java_thread() const { return false; }
289 virtual bool is_Compiler_thread() const { return false; }
290 virtual bool is_hidden_from_external_view() const { return false; }
291 virtual bool is_jvmti_agent_thread() const { return false; }
292 // True iff the thread can perform GC operations at a safepoint.
293 // Generally will be true only of VM thread and parallel GC WorkGang
294 // threads.
295 virtual bool is_GC_task_thread() const { return false; }
296 virtual bool is_Watcher_thread() const { return false; }
297 virtual bool is_ConcurrentGC_thread() const { return false; }
298 virtual bool is_Named_thread() const { return false; }
299 virtual bool is_Worker_thread() const { return false; }
301 // Casts
302 virtual WorkerThread* as_Worker_thread() const { return NULL; }
304 virtual char* name() const { return (char*)"Unknown thread"; }
306 // Returns the current thread
307 static inline Thread* current();
309 // Common thread operations
310 static void set_priority(Thread* thread, ThreadPriority priority);
311 static ThreadPriority get_priority(const Thread* const thread);
312 static void start(Thread* thread);
313 static void interrupt(Thread* thr);
314 static bool is_interrupted(Thread* thr, bool clear_interrupted);
316 void set_native_thread_name(const char *name) {
317 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
318 os::set_native_thread_name(name);
319 }
321 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
322 Monitor* SR_lock() const { return _SR_lock; }
324 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
326 void set_suspend_flag(SuspendFlags f) {
327 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
328 uint32_t flags;
329 do {
330 flags = _suspend_flags;
331 }
332 while (Atomic::cmpxchg((jint)(flags | f),
333 (volatile jint*)&_suspend_flags,
334 (jint)flags) != (jint)flags);
335 }
336 void clear_suspend_flag(SuspendFlags f) {
337 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
338 uint32_t flags;
339 do {
340 flags = _suspend_flags;
341 }
342 while (Atomic::cmpxchg((jint)(flags & ~f),
343 (volatile jint*)&_suspend_flags,
344 (jint)flags) != (jint)flags);
345 }
347 void set_has_async_exception() {
348 set_suspend_flag(_has_async_exception);
349 }
350 void clear_has_async_exception() {
351 clear_suspend_flag(_has_async_exception);
352 }
354 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
356 void set_critical_native_unlock() {
357 set_suspend_flag(_critical_native_unlock);
358 }
359 void clear_critical_native_unlock() {
360 clear_suspend_flag(_critical_native_unlock);
361 }
363 // Support for Unhandled Oop detection
364 #ifdef CHECK_UNHANDLED_OOPS
365 private:
366 UnhandledOops* _unhandled_oops;
367 public:
368 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
369 // Mark oop safe for gc. It may be stack allocated but won't move.
370 void allow_unhandled_oop(oop *op) {
371 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
372 }
373 // Clear oops at safepoint so crashes point to unhandled oop violator
374 void clear_unhandled_oops() {
375 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
376 }
377 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
378 #endif // CHECK_UNHANDLED_OOPS
380 #ifndef PRODUCT
381 bool skip_gcalot() { return _skip_gcalot; }
382 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
383 #endif
385 public:
386 // Installs a pending exception to be inserted later
387 static void send_async_exception(oop thread_oop, oop java_throwable);
389 // Resource area
390 ResourceArea* resource_area() const { return _resource_area; }
391 void set_resource_area(ResourceArea* area) { _resource_area = area; }
393 OSThread* osthread() const { return _osthread; }
394 void set_osthread(OSThread* thread) { _osthread = thread; }
396 // JNI handle support
397 JNIHandleBlock* active_handles() const { return _active_handles; }
398 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
399 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
400 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
402 // Internal handle support
403 HandleArea* handle_area() const { return _handle_area; }
404 void set_handle_area(HandleArea* area) { _handle_area = area; }
406 // Thread-Local Allocation Buffer (TLAB) support
407 ThreadLocalAllocBuffer& tlab() { return _tlab; }
408 void initialize_tlab() {
409 if (UseTLAB) {
410 tlab().initialize();
411 }
412 }
414 jlong allocated_bytes() { return _allocated_bytes; }
415 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
416 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
417 jlong cooked_allocated_bytes() {
418 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
419 if (UseTLAB) {
420 size_t used_bytes = tlab().used_bytes();
421 if ((ssize_t)used_bytes > 0) {
422 // More-or-less valid tlab. The load_acquire above should ensure
423 // that the result of the add is <= the instantaneous value
424 return allocated_bytes + used_bytes;
425 }
426 }
427 return allocated_bytes;
428 }
430 TRACE_BUFFER trace_buffer() { return _trace_buffer; }
431 void set_trace_buffer(TRACE_BUFFER buf) { _trace_buffer = buf; }
433 // VM operation support
434 int vm_operation_ticket() { return ++_vm_operation_started_count; }
435 int vm_operation_completed_count() { return _vm_operation_completed_count; }
436 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
438 // For tracking the heavyweight monitor the thread is pending on.
439 ObjectMonitor* current_pending_monitor() {
440 return _current_pending_monitor;
441 }
442 void set_current_pending_monitor(ObjectMonitor* monitor) {
443 _current_pending_monitor = monitor;
444 }
445 void set_current_pending_monitor_is_from_java(bool from_java) {
446 _current_pending_monitor_is_from_java = from_java;
447 }
448 bool current_pending_monitor_is_from_java() {
449 return _current_pending_monitor_is_from_java;
450 }
452 // For tracking the ObjectMonitor on which this thread called Object.wait()
453 ObjectMonitor* current_waiting_monitor() {
454 return _current_waiting_monitor;
455 }
456 void set_current_waiting_monitor(ObjectMonitor* monitor) {
457 _current_waiting_monitor = monitor;
458 }
460 // GC support
461 // Apply "f->do_oop" to all root oops in "this".
462 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
463 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf);
465 // Handles the parallel case for the method below.
466 private:
467 bool claim_oops_do_par_case(int collection_parity);
468 public:
469 // Requires that "collection_parity" is that of the current strong roots
470 // iteration. If "is_par" is false, sets the parity of "this" to
471 // "collection_parity", and returns "true". If "is_par" is true,
472 // uses an atomic instruction to set the current threads parity to
473 // "collection_parity", if it is not already. Returns "true" iff the
474 // calling thread does the update, this indicates that the calling thread
475 // has claimed the thread's stack as a root groop in the current
476 // collection.
477 bool claim_oops_do(bool is_par, int collection_parity) {
478 if (!is_par) {
479 _oops_do_parity = collection_parity;
480 return true;
481 } else {
482 return claim_oops_do_par_case(collection_parity);
483 }
484 }
486 // Sweeper support
487 void nmethods_do(CodeBlobClosure* cf);
489 // Used by fast lock support
490 virtual bool is_lock_owned(address adr) const;
492 // Check if address is in the stack of the thread (not just for locks).
493 // Warning: the method can only be used on the running thread
494 bool is_in_stack(address adr) const;
496 // Sets this thread as starting thread. Returns failure if thread
497 // creation fails due to lack of memory, too many threads etc.
498 bool set_as_starting_thread();
500 protected:
501 // OS data associated with the thread
502 OSThread* _osthread; // Platform-specific thread information
504 // Thread local resource area for temporary allocation within the VM
505 ResourceArea* _resource_area;
507 // Thread local handle area for allocation of handles within the VM
508 HandleArea* _handle_area;
510 // Support for stack overflow handling, get_thread, etc.
511 address _stack_base;
512 size_t _stack_size;
513 uintptr_t _self_raw_id; // used by get_thread (mutable)
514 int _lgrp_id;
516 public:
517 // Stack overflow support
518 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
520 void set_stack_base(address base) { _stack_base = base; }
521 size_t stack_size() const { return _stack_size; }
522 void set_stack_size(size_t size) { _stack_size = size; }
523 void record_stack_base_and_size();
525 bool on_local_stack(address adr) const {
526 /* QQQ this has knowledge of direction, ought to be a stack method */
527 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
528 }
530 uintptr_t self_raw_id() { return _self_raw_id; }
531 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
533 int lgrp_id() const { return _lgrp_id; }
534 void set_lgrp_id(int value) { _lgrp_id = value; }
536 // Printing
537 void print_on(outputStream* st) const;
538 void print() const { print_on(tty); }
539 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
541 // Debug-only code
543 #ifdef ASSERT
544 private:
545 // Deadlock detection support for Mutex locks. List of locks own by thread.
546 Monitor* _owned_locks;
547 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
548 // thus the friendship
549 friend class Mutex;
550 friend class Monitor;
552 public:
553 void print_owned_locks_on(outputStream* st) const;
554 void print_owned_locks() const { print_owned_locks_on(tty); }
555 Monitor* owned_locks() const { return _owned_locks; }
556 bool owns_locks() const { return owned_locks() != NULL; }
557 bool owns_locks_but_compiled_lock() const;
559 // Deadlock detection
560 bool allow_allocation() { return _allow_allocation_count == 0; }
561 #endif
563 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
565 private:
566 volatile int _jvmti_env_iteration_count;
568 public:
569 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
570 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
571 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
573 // Code generation
574 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
575 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
576 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
578 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
579 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
581 #define TLAB_FIELD_OFFSET(name) \
582 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
584 TLAB_FIELD_OFFSET(start)
585 TLAB_FIELD_OFFSET(end)
586 TLAB_FIELD_OFFSET(top)
587 TLAB_FIELD_OFFSET(pf_top)
588 TLAB_FIELD_OFFSET(size) // desired_size
589 TLAB_FIELD_OFFSET(refill_waste_limit)
590 TLAB_FIELD_OFFSET(number_of_refills)
591 TLAB_FIELD_OFFSET(fast_refill_waste)
592 TLAB_FIELD_OFFSET(slow_allocations)
594 #undef TLAB_FIELD_OFFSET
596 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
598 public:
599 volatile intptr_t _Stalled ;
600 volatile int _TypeTag ;
601 ParkEvent * _ParkEvent ; // for synchronized()
602 ParkEvent * _SleepEvent ; // for Thread.sleep
603 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
604 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
605 int NativeSyncRecursion ; // diagnostic
607 volatile int _OnTrap ; // Resume-at IP delta
608 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
609 jint _hashStateX ; // thread-specific hashCode generator state
610 jint _hashStateY ;
611 jint _hashStateZ ;
612 void * _schedctl ;
614 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code
615 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); }
616 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); }
618 volatile jint rng [4] ; // RNG for spin loop
620 // Low-level leaf-lock primitives used to implement synchronization
621 // and native monitor-mutex infrastructure.
622 // Not for general synchronization use.
623 static void SpinAcquire (volatile int * Lock, const char * Name) ;
624 static void SpinRelease (volatile int * Lock) ;
625 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
626 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
627 static void muxRelease (volatile intptr_t * Lock) ;
628 };
630 // Inline implementation of Thread::current()
631 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
632 // startup.
633 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
634 // period. This is inlined in thread_<os_family>.inline.hpp.
636 inline Thread* Thread::current() {
637 #ifdef ASSERT
638 // This function is very high traffic. Define PARANOID to enable expensive
639 // asserts.
640 #ifdef PARANOID
641 // Signal handler should call ThreadLocalStorage::get_thread_slow()
642 Thread* t = ThreadLocalStorage::get_thread_slow();
643 assert(t != NULL && !t->is_inside_signal_handler(),
644 "Don't use Thread::current() inside signal handler");
645 #endif
646 #endif
647 Thread* thread = ThreadLocalStorage::thread();
648 assert(thread != NULL, "just checking");
649 return thread;
650 }
652 // Name support for threads. non-JavaThread subclasses with multiple
653 // uniquely named instances should derive from this.
654 class NamedThread: public Thread {
655 friend class VMStructs;
656 enum {
657 max_name_len = 64
658 };
659 private:
660 char* _name;
661 // log JavaThread being processed by oops_do
662 JavaThread* _processed_thread;
664 public:
665 NamedThread();
666 ~NamedThread();
667 // May only be called once per thread.
668 void set_name(const char* format, ...);
669 virtual bool is_Named_thread() const { return true; }
670 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
671 JavaThread *processed_thread() { return _processed_thread; }
672 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
673 };
675 // Worker threads are named and have an id of an assigned work.
676 class WorkerThread: public NamedThread {
677 private:
678 uint _id;
679 public:
680 WorkerThread() : _id(0) { }
681 virtual bool is_Worker_thread() const { return true; }
683 virtual WorkerThread* as_Worker_thread() const {
684 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
685 return (WorkerThread*) this;
686 }
688 void set_id(uint work_id) { _id = work_id; }
689 uint id() const { return _id; }
690 };
692 // A single WatcherThread is used for simulating timer interrupts.
693 class WatcherThread: public Thread {
694 friend class VMStructs;
695 public:
696 virtual void run();
698 private:
699 static WatcherThread* _watcher_thread;
701 volatile static bool _should_terminate; // updated without holding lock
702 public:
703 enum SomeConstants {
704 delay_interval = 10 // interrupt delay in milliseconds
705 };
707 // Constructor
708 WatcherThread();
710 // Tester
711 bool is_Watcher_thread() const { return true; }
713 // Printing
714 char* name() const { return (char*)"VM Periodic Task Thread"; }
715 void print_on(outputStream* st) const;
716 void print() const { print_on(tty); }
718 // Returns the single instance of WatcherThread
719 static WatcherThread* watcher_thread() { return _watcher_thread; }
721 // Create and start the single instance of WatcherThread, or stop it on shutdown
722 static void start();
723 static void stop();
724 };
727 class CompilerThread;
729 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
731 class JavaThread: public Thread {
732 friend class VMStructs;
733 private:
734 JavaThread* _next; // The next thread in the Threads list
735 oop _threadObj; // The Java level thread object
737 #ifdef ASSERT
738 private:
739 int _java_call_counter;
741 public:
742 int java_call_counter() { return _java_call_counter; }
743 void inc_java_call_counter() { _java_call_counter++; }
744 void dec_java_call_counter() {
745 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
746 _java_call_counter--;
747 }
748 private: // restore original namespace restriction
749 #endif // ifdef ASSERT
751 #ifndef PRODUCT
752 public:
753 enum {
754 jump_ring_buffer_size = 16
755 };
756 private: // restore original namespace restriction
757 #endif
759 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
761 ThreadFunction _entry_point;
763 JNIEnv _jni_environment;
765 // Deopt support
766 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
768 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
769 // transition out of native
770 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
771 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
772 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
773 // Because deoptimization is lazy we must save jvmti requests to set locals
774 // in compiled frames until we deoptimize and we have an interpreter frame.
775 // This holds the pointer to array (yeah like there might be more than one) of
776 // description of compiled vframes that have locals that need to be updated.
777 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
779 // Handshake value for fixing 6243940. We need a place for the i2c
780 // adapter to store the callee methodOop. This value is NEVER live
781 // across a gc point so it does NOT have to be gc'd
782 // The handshake is open ended since we can't be certain that it will
783 // be NULLed. This is because we rarely ever see the race and end up
784 // in handle_wrong_method which is the backend of the handshake. See
785 // code in i2c adapters and handle_wrong_method.
787 methodOop _callee_target;
789 // Oop results of VM runtime calls
790 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved
791 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved
793 // See ReduceInitialCardMarks: this holds the precise space interval of
794 // the most recent slow path allocation for which compiled code has
795 // elided card-marks for performance along the fast-path.
796 MemRegion _deferred_card_mark;
798 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
799 // allocated during deoptimization
800 // and by JNI_MonitorEnter/Exit
802 // Async. requests support
803 enum AsyncRequests {
804 _no_async_condition = 0,
805 _async_exception,
806 _async_unsafe_access_error
807 };
808 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
809 oop _pending_async_exception;
811 // Safepoint support
812 public: // Expose _thread_state for SafeFetchInt()
813 volatile JavaThreadState _thread_state;
814 private:
815 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
816 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
818 // JavaThread termination support
819 enum TerminatedTypes {
820 _not_terminated = 0xDEAD - 2,
821 _thread_exiting, // JavaThread::exit() has been called for this thread
822 _thread_terminated, // JavaThread is removed from thread list
823 _vm_exited // JavaThread is still executing native code, but VM is terminated
824 // only VM_Exit can set _vm_exited
825 };
827 // In general a JavaThread's _terminated field transitions as follows:
828 //
829 // _not_terminated => _thread_exiting => _thread_terminated
830 //
831 // _vm_exited is a special value to cover the case of a JavaThread
832 // executing native code after the VM itself is terminated.
833 volatile TerminatedTypes _terminated;
834 // suspend/resume support
835 volatile bool _suspend_equivalent; // Suspend equivalent condition
836 jint _in_deopt_handler; // count of deoptimization
837 // handlers thread is in
838 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
839 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
840 // never locked) when throwing an exception. Used by interpreter only.
842 // JNI attach states:
843 enum JNIAttachStates {
844 _not_attaching_via_jni = 1, // thread is not attaching via JNI
845 _attaching_via_jni, // thread is attaching via JNI
846 _attached_via_jni // thread has attached via JNI
847 };
849 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
850 // A native thread that is attaching via JNI starts with a value
851 // of _attaching_via_jni and transitions to _attached_via_jni.
852 volatile JNIAttachStates _jni_attach_state;
854 public:
855 // State of the stack guard pages for this thread.
856 enum StackGuardState {
857 stack_guard_unused, // not needed
858 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
859 stack_guard_enabled // enabled
860 };
862 private:
864 StackGuardState _stack_guard_state;
866 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
867 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
868 // code)
869 volatile oop _exception_oop; // Exception thrown in compiled code
870 volatile address _exception_pc; // PC where exception happened
871 volatile address _exception_handler_pc; // PC for handler of exception
872 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
874 // support for compilation
875 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
877 // support for JNI critical regions
878 jint _jni_active_critical; // count of entries into JNI critical region
880 // For deadlock detection.
881 int _depth_first_number;
883 // JVMTI PopFrame support
884 // This is set to popframe_pending to signal that top Java frame should be popped immediately
885 int _popframe_condition;
887 #ifndef PRODUCT
888 int _jmp_ring_index;
889 struct {
890 // We use intptr_t instead of address so debugger doesn't try and display strings
891 intptr_t _target;
892 intptr_t _instruction;
893 const char* _file;
894 int _line;
895 } _jmp_ring[ jump_ring_buffer_size ];
896 #endif /* PRODUCT */
898 #ifndef SERIALGC
899 // Support for G1 barriers
901 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
902 // Set of all such queues.
903 static SATBMarkQueueSet _satb_mark_queue_set;
905 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
906 // Set of all such queues.
907 static DirtyCardQueueSet _dirty_card_queue_set;
909 void flush_barrier_queues();
910 #endif // !SERIALGC
912 friend class VMThread;
913 friend class ThreadWaitTransition;
914 friend class VM_Exit;
916 void initialize(); // Initialized the instance variables
918 public:
919 // Constructor
920 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
921 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
922 ~JavaThread();
924 #ifdef ASSERT
925 // verify this JavaThread hasn't be published in the Threads::list yet
926 void verify_not_published();
927 #endif
929 //JNI functiontable getter/setter for JVMTI jni function table interception API.
930 void set_jni_functions(struct JNINativeInterface_* functionTable) {
931 _jni_environment.functions = functionTable;
932 }
933 struct JNINativeInterface_* get_jni_functions() {
934 return (struct JNINativeInterface_ *)_jni_environment.functions;
935 }
937 // This function is called at thread creation to allow
938 // platform specific thread variables to be initialized.
939 void cache_global_variables();
941 // Executes Shutdown.shutdown()
942 void invoke_shutdown_hooks();
944 // Cleanup on thread exit
945 enum ExitType {
946 normal_exit,
947 jni_detach
948 };
949 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
951 void cleanup_failed_attach_current_thread();
953 // Testers
954 virtual bool is_Java_thread() const { return true; }
956 // compilation
957 void set_is_compiling(bool f) { _is_compiling = f; }
958 bool is_compiling() const { return _is_compiling; }
960 // Thread chain operations
961 JavaThread* next() const { return _next; }
962 void set_next(JavaThread* p) { _next = p; }
964 // Thread oop. threadObj() can be NULL for initial JavaThread
965 // (or for threads attached via JNI)
966 oop threadObj() const { return _threadObj; }
967 void set_threadObj(oop p) { _threadObj = p; }
969 ThreadPriority java_priority() const; // Read from threadObj()
971 // Prepare thread and add to priority queue. If a priority is
972 // not specified, use the priority of the thread object. Threads_lock
973 // must be held while this function is called.
974 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
976 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
977 address saved_exception_pc() { return _saved_exception_pc; }
980 ThreadFunction entry_point() const { return _entry_point; }
982 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
983 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
985 // Last frame anchor routines
987 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
989 // last_Java_sp
990 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
991 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
993 // last_Java_pc
995 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
997 // Safepoint support
998 JavaThreadState thread_state() const { return _thread_state; }
999 void set_thread_state(JavaThreadState s) { _thread_state=s; }
1000 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1001 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1002 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1004 // thread has called JavaThread::exit() or is terminated
1005 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1006 // thread is terminated (no longer on the threads list); we compare
1007 // against the two non-terminated values so that a freed JavaThread
1008 // will also be considered terminated.
1009 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1010 void set_terminated(TerminatedTypes t) { _terminated = t; }
1011 // special for Threads::remove() which is static:
1012 void set_terminated_value() { _terminated = _thread_terminated; }
1013 void block_if_vm_exited();
1015 bool doing_unsafe_access() { return _doing_unsafe_access; }
1016 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1018 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1019 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1022 // Suspend/resume support for JavaThread
1024 private:
1025 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1026 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1028 public:
1029 void java_suspend();
1030 void java_resume();
1031 int java_suspend_self();
1033 void check_and_wait_while_suspended() {
1034 assert(JavaThread::current() == this, "sanity check");
1036 bool do_self_suspend;
1037 do {
1038 // were we externally suspended while we were waiting?
1039 do_self_suspend = handle_special_suspend_equivalent_condition();
1040 if (do_self_suspend) {
1041 // don't surprise the thread that suspended us by returning
1042 java_suspend_self();
1043 set_suspend_equivalent();
1044 }
1045 } while (do_self_suspend);
1046 }
1047 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1048 // Check for async exception in addition to safepoint and suspend request.
1049 static void check_special_condition_for_native_trans(JavaThread *thread);
1051 // Same as check_special_condition_for_native_trans but finishes the
1052 // transition into thread_in_Java mode so that it can potentially
1053 // block.
1054 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1056 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1057 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1058 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1059 // Warning: is_ext_suspend_completed() may temporarily drop the
1060 // SR_lock to allow the thread to reach a stable thread state if
1061 // it is currently in a transient thread state.
1062 return is_ext_suspend_completed(false /*!called_by_wait */,
1063 SuspendRetryDelay, bits);
1064 }
1066 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1067 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1068 // passed as the count and delay parameters. Experiments with specific
1069 // calls to wait_for_ext_suspend_completion() can be done by passing
1070 // other values in the code. Experiments with all calls can be done
1071 // via the appropriate -XX options.
1072 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1074 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1075 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1077 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1078 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1079 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1081 bool is_external_suspend() const {
1082 return (_suspend_flags & _external_suspend) != 0;
1083 }
1084 // Whenever a thread transitions from native to vm/java it must suspend
1085 // if external|deopt suspend is present.
1086 bool is_suspend_after_native() const {
1087 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1088 }
1090 // external suspend request is completed
1091 bool is_ext_suspended() const {
1092 return (_suspend_flags & _ext_suspended) != 0;
1093 }
1095 bool is_external_suspend_with_lock() const {
1096 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1097 return is_external_suspend();
1098 }
1100 // Special method to handle a pending external suspend request
1101 // when a suspend equivalent condition lifts.
1102 bool handle_special_suspend_equivalent_condition() {
1103 assert(is_suspend_equivalent(),
1104 "should only be called in a suspend equivalence condition");
1105 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1106 bool ret = is_external_suspend();
1107 if (!ret) {
1108 // not about to self-suspend so clear suspend equivalence
1109 clear_suspend_equivalent();
1110 }
1111 // implied else:
1112 // We have a pending external suspend request so we leave the
1113 // suspend_equivalent flag set until java_suspend_self() sets
1114 // the ext_suspended flag and clears the suspend_equivalent
1115 // flag. This insures that wait_for_ext_suspend_completion()
1116 // will return consistent values.
1117 return ret;
1118 }
1120 // utility methods to see if we are doing some kind of suspension
1121 bool is_being_ext_suspended() const {
1122 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1123 return is_ext_suspended() || is_external_suspend();
1124 }
1126 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1128 void set_suspend_equivalent() { _suspend_equivalent = true; };
1129 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1131 // Thread.stop support
1132 void send_thread_stop(oop throwable);
1133 AsyncRequests clear_special_runtime_exit_condition() {
1134 AsyncRequests x = _special_runtime_exit_condition;
1135 _special_runtime_exit_condition = _no_async_condition;
1136 return x;
1137 }
1139 // Are any async conditions present?
1140 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1142 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1144 // these next two are also used for self-suspension and async exception support
1145 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1147 // Return true if JavaThread has an asynchronous condition or
1148 // if external suspension is requested.
1149 bool has_special_runtime_exit_condition() {
1150 // We call is_external_suspend() last since external suspend should
1151 // be less common. Because we don't use is_external_suspend_with_lock
1152 // it is possible that we won't see an asynchronous external suspend
1153 // request that has just gotten started, i.e., SR_lock grabbed but
1154 // _external_suspend field change either not made yet or not visible
1155 // yet. However, this is okay because the request is asynchronous and
1156 // we will see the new flag value the next time through. It's also
1157 // possible that the external suspend request is dropped after
1158 // we have checked is_external_suspend(), we will recheck its value
1159 // under SR_lock in java_suspend_self().
1160 return (_special_runtime_exit_condition != _no_async_condition) ||
1161 is_external_suspend() || is_deopt_suspend();
1162 }
1164 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1166 void set_pending_async_exception(oop e) {
1167 _pending_async_exception = e;
1168 _special_runtime_exit_condition = _async_exception;
1169 set_has_async_exception();
1170 }
1172 // Fast-locking support
1173 bool is_lock_owned(address adr) const;
1175 // Accessors for vframe array top
1176 // The linked list of vframe arrays are sorted on sp. This means when we
1177 // unpack the head must contain the vframe array to unpack.
1178 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1179 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1181 // Side structure for defering update of java frame locals until deopt occurs
1182 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1183 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1185 // These only really exist to make debugging deopt problems simpler
1187 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1188 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1190 // The special resourceMark used during deoptimization
1192 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1193 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1195 intptr_t* must_deopt_id() { return _must_deopt_id; }
1196 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1197 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1199 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1200 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1202 methodOop callee_target() const { return _callee_target; }
1203 void set_callee_target (methodOop x) { _callee_target = x; }
1205 // Oop results of vm runtime calls
1206 oop vm_result() const { return _vm_result; }
1207 void set_vm_result (oop x) { _vm_result = x; }
1209 oop vm_result_2() const { return _vm_result_2; }
1210 void set_vm_result_2 (oop x) { _vm_result_2 = x; }
1212 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1213 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1215 // Exception handling for compiled methods
1216 oop exception_oop() const { return _exception_oop; }
1217 address exception_pc() const { return _exception_pc; }
1218 address exception_handler_pc() const { return _exception_handler_pc; }
1219 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1221 void set_exception_oop(oop o) { _exception_oop = o; }
1222 void set_exception_pc(address a) { _exception_pc = a; }
1223 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1224 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1226 // Stack overflow support
1227 inline size_t stack_available(address cur_sp);
1228 address stack_yellow_zone_base()
1229 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1230 size_t stack_yellow_zone_size()
1231 { return StackYellowPages * os::vm_page_size(); }
1232 address stack_red_zone_base()
1233 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1234 size_t stack_red_zone_size()
1235 { return StackRedPages * os::vm_page_size(); }
1236 bool in_stack_yellow_zone(address a)
1237 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1238 bool in_stack_red_zone(address a)
1239 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1241 void create_stack_guard_pages();
1242 void remove_stack_guard_pages();
1244 void enable_stack_yellow_zone();
1245 void disable_stack_yellow_zone();
1246 void enable_stack_red_zone();
1247 void disable_stack_red_zone();
1249 inline bool stack_yellow_zone_disabled();
1250 inline bool stack_yellow_zone_enabled();
1252 // Attempt to reguard the stack after a stack overflow may have occurred.
1253 // Returns true if (a) guard pages are not needed on this thread, (b) the
1254 // pages are already guarded, or (c) the pages were successfully reguarded.
1255 // Returns false if there is not enough stack space to reguard the pages, in
1256 // which case the caller should unwind a frame and try again. The argument
1257 // should be the caller's (approximate) sp.
1258 bool reguard_stack(address cur_sp);
1259 // Similar to above but see if current stackpoint is out of the guard area
1260 // and reguard if possible.
1261 bool reguard_stack(void);
1263 // Misc. accessors/mutators
1264 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1265 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1266 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1268 #ifndef PRODUCT
1269 void record_jump(address target, address instr, const char* file, int line);
1270 #endif /* PRODUCT */
1272 // For assembly stub generation
1273 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1274 #ifndef PRODUCT
1275 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1276 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1277 #endif /* PRODUCT */
1278 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1279 static ByteSize last_Java_sp_offset() {
1280 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1281 }
1282 static ByteSize last_Java_pc_offset() {
1283 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1284 }
1285 static ByteSize frame_anchor_offset() {
1286 return byte_offset_of(JavaThread, _anchor);
1287 }
1288 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1289 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1290 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1291 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1292 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1293 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1294 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1295 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1296 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1297 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1298 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1299 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1301 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1302 static ByteSize should_post_on_exceptions_flag_offset() {
1303 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1304 }
1306 #ifndef SERIALGC
1307 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1308 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1309 #endif // !SERIALGC
1311 // Returns the jni environment for this thread
1312 JNIEnv* jni_environment() { return &_jni_environment; }
1314 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1315 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1316 // Only return NULL if thread is off the thread list; starting to
1317 // exit should not return NULL.
1318 if (thread_from_jni_env->is_terminated()) {
1319 thread_from_jni_env->block_if_vm_exited();
1320 return NULL;
1321 } else {
1322 return thread_from_jni_env;
1323 }
1324 }
1326 // JNI critical regions. These can nest.
1327 bool in_critical() { return _jni_active_critical > 0; }
1328 bool in_last_critical() { return _jni_active_critical == 1; }
1329 void enter_critical() { assert(Thread::current() == this ||
1330 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1331 "this must be current thread or synchronizing");
1332 _jni_active_critical++; }
1333 void exit_critical() { assert(Thread::current() == this,
1334 "this must be current thread");
1335 _jni_active_critical--;
1336 assert(_jni_active_critical >= 0,
1337 "JNI critical nesting problem?"); }
1339 // For deadlock detection
1340 int depth_first_number() { return _depth_first_number; }
1341 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1343 private:
1344 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1346 public:
1347 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1348 void add_monitor_chunk(MonitorChunk* chunk);
1349 void remove_monitor_chunk(MonitorChunk* chunk);
1350 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1351 void inc_in_deopt_handler() { _in_deopt_handler++; }
1352 void dec_in_deopt_handler() {
1353 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1354 if (_in_deopt_handler > 0) { // robustness
1355 _in_deopt_handler--;
1356 }
1357 }
1359 private:
1360 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1362 public:
1364 // Frame iteration; calls the function f for all frames on the stack
1365 void frames_do(void f(frame*, const RegisterMap*));
1367 // Memory operations
1368 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1370 // Sweeper operations
1371 void nmethods_do(CodeBlobClosure* cf);
1373 // Memory management operations
1374 void gc_epilogue();
1375 void gc_prologue();
1377 // Misc. operations
1378 char* name() const { return (char*)get_thread_name(); }
1379 void print_on(outputStream* st) const;
1380 void print() const { print_on(tty); }
1381 void print_value();
1382 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1383 void print_thread_state() const PRODUCT_RETURN;
1384 void print_on_error(outputStream* st, char* buf, int buflen) const;
1385 void verify();
1386 const char* get_thread_name() const;
1387 private:
1388 // factor out low-level mechanics for use in both normal and error cases
1389 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1390 public:
1391 const char* get_threadgroup_name() const;
1392 const char* get_parent_name() const;
1394 // Accessing frames
1395 frame last_frame() {
1396 _anchor.make_walkable(this);
1397 return pd_last_frame();
1398 }
1399 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1401 // Returns method at 'depth' java or native frames down the stack
1402 // Used for security checks
1403 klassOop security_get_caller_class(int depth);
1405 // Print stack trace in external format
1406 void print_stack_on(outputStream* st);
1407 void print_stack() { print_stack_on(tty); }
1409 // Print stack traces in various internal formats
1410 void trace_stack() PRODUCT_RETURN;
1411 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1412 void trace_frames() PRODUCT_RETURN;
1413 void trace_oops() PRODUCT_RETURN;
1415 // Print an annotated view of the stack frames
1416 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1417 void validate_frame_layout() {
1418 print_frame_layout(0, true);
1419 }
1421 // Returns the number of stack frames on the stack
1422 int depth() const;
1424 // Function for testing deoptimization
1425 void deoptimize();
1426 void make_zombies();
1428 void deoptimized_wrt_marked_nmethods();
1430 // Profiling operation (see fprofile.cpp)
1431 public:
1432 bool profile_last_Java_frame(frame* fr);
1434 private:
1435 ThreadProfiler* _thread_profiler;
1436 private:
1437 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1438 friend class FlatProfilerTask; // uses get_thread_profiler.
1439 friend class ThreadProfilerMark; // uses get_thread_profiler.
1440 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1441 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1442 ThreadProfiler* result = _thread_profiler;
1443 _thread_profiler = tp;
1444 return result;
1445 }
1447 // Static operations
1448 public:
1449 // Returns the running thread as a JavaThread
1450 static inline JavaThread* current();
1452 // Returns the active Java thread. Do not use this if you know you are calling
1453 // from a JavaThread, as it's slower than JavaThread::current. If called from
1454 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1455 // operation. You may not want that either.
1456 static JavaThread* active();
1458 inline CompilerThread* as_CompilerThread();
1460 public:
1461 virtual void run();
1462 void thread_main_inner();
1464 private:
1465 // PRIVILEGED STACK
1466 PrivilegedElement* _privileged_stack_top;
1467 GrowableArray<oop>* _array_for_gc;
1468 public:
1470 // Returns the privileged_stack information.
1471 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1472 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1473 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1475 public:
1476 // Thread local information maintained by JVMTI.
1477 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1478 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1479 // getter is used to get this JavaThread's JvmtiThreadState if it has
1480 // one which means NULL can be returned. JvmtiThreadState::state_for()
1481 // is used to get the specified JavaThread's JvmtiThreadState if it has
1482 // one or it allocates a new JvmtiThreadState for the JavaThread and
1483 // returns it. JvmtiThreadState::state_for() will return NULL only if
1484 // the specified JavaThread is exiting.
1485 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1486 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1487 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1488 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1490 // JVMTI PopFrame support
1491 // Setting and clearing popframe_condition
1492 // All of these enumerated values are bits. popframe_pending
1493 // indicates that a PopFrame() has been requested and not yet been
1494 // completed. popframe_processing indicates that that PopFrame() is in
1495 // the process of being completed. popframe_force_deopt_reexecution_bit
1496 // indicates that special handling is required when returning to a
1497 // deoptimized caller.
1498 enum PopCondition {
1499 popframe_inactive = 0x00,
1500 popframe_pending_bit = 0x01,
1501 popframe_processing_bit = 0x02,
1502 popframe_force_deopt_reexecution_bit = 0x04
1503 };
1504 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1505 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1506 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1507 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1508 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1509 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1510 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1511 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1512 #ifdef CC_INTERP
1513 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1514 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1515 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1516 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1517 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1518 #endif
1520 private:
1521 // Saved incoming arguments to popped frame.
1522 // Used only when popped interpreted frame returns to deoptimized frame.
1523 void* _popframe_preserved_args;
1524 int _popframe_preserved_args_size;
1526 public:
1527 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1528 void* popframe_preserved_args();
1529 ByteSize popframe_preserved_args_size();
1530 WordSize popframe_preserved_args_size_in_words();
1531 void popframe_free_preserved_args();
1534 private:
1535 JvmtiThreadState *_jvmti_thread_state;
1536 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1538 // Used by the interpreter in fullspeed mode for frame pop, method
1539 // entry, method exit and single stepping support. This field is
1540 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1541 // It can be set to zero asynchronously (i.e., without a VM operation
1542 // or a lock) so we have to be very careful.
1543 int _interp_only_mode;
1545 public:
1546 // used by the interpreter for fullspeed debugging support (see above)
1547 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1548 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1549 int get_interp_only_mode() { return _interp_only_mode; }
1550 void increment_interp_only_mode() { ++_interp_only_mode; }
1551 void decrement_interp_only_mode() { --_interp_only_mode; }
1553 // support for cached flag that indicates whether exceptions need to be posted for this thread
1554 // if this is false, we can avoid deoptimizing when events are thrown
1555 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1556 private:
1557 int _should_post_on_exceptions_flag;
1559 public:
1560 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1561 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1563 private:
1564 ThreadStatistics *_thread_stat;
1566 public:
1567 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1569 // Return a blocker object for which this thread is blocked parking.
1570 oop current_park_blocker();
1572 private:
1573 static size_t _stack_size_at_create;
1575 public:
1576 static inline size_t stack_size_at_create(void) {
1577 return _stack_size_at_create;
1578 }
1579 static inline void set_stack_size_at_create(size_t value) {
1580 _stack_size_at_create = value;
1581 }
1583 #ifndef SERIALGC
1584 // SATB marking queue support
1585 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1586 static SATBMarkQueueSet& satb_mark_queue_set() {
1587 return _satb_mark_queue_set;
1588 }
1590 // Dirty card queue support
1591 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1592 static DirtyCardQueueSet& dirty_card_queue_set() {
1593 return _dirty_card_queue_set;
1594 }
1595 #endif // !SERIALGC
1597 // This method initializes the SATB and dirty card queues before a
1598 // JavaThread is added to the Java thread list. Right now, we don't
1599 // have to do anything to the dirty card queue (it should have been
1600 // activated when the thread was created), but we have to activate
1601 // the SATB queue if the thread is created while a marking cycle is
1602 // in progress. The activation / de-activation of the SATB queues at
1603 // the beginning / end of a marking cycle is done during safepoints
1604 // so we have to make sure this method is called outside one to be
1605 // able to safely read the active field of the SATB queue set. Right
1606 // now, it is called just before the thread is added to the Java
1607 // thread list in the Threads::add() method. That method is holding
1608 // the Threads_lock which ensures we are outside a safepoint. We
1609 // cannot do the obvious and set the active field of the SATB queue
1610 // when the thread is created given that, in some cases, safepoints
1611 // might happen between the JavaThread constructor being called and the
1612 // thread being added to the Java thread list (an example of this is
1613 // when the structure for the DestroyJavaVM thread is created).
1614 #ifndef SERIALGC
1615 void initialize_queues();
1616 #else // !SERIALGC
1617 void initialize_queues() { }
1618 #endif // !SERIALGC
1620 // Machine dependent stuff
1621 #ifdef TARGET_OS_ARCH_linux_x86
1622 # include "thread_linux_x86.hpp"
1623 #endif
1624 #ifdef TARGET_OS_ARCH_linux_sparc
1625 # include "thread_linux_sparc.hpp"
1626 #endif
1627 #ifdef TARGET_OS_ARCH_linux_zero
1628 # include "thread_linux_zero.hpp"
1629 #endif
1630 #ifdef TARGET_OS_ARCH_solaris_x86
1631 # include "thread_solaris_x86.hpp"
1632 #endif
1633 #ifdef TARGET_OS_ARCH_solaris_sparc
1634 # include "thread_solaris_sparc.hpp"
1635 #endif
1636 #ifdef TARGET_OS_ARCH_windows_x86
1637 # include "thread_windows_x86.hpp"
1638 #endif
1639 #ifdef TARGET_OS_ARCH_linux_arm
1640 # include "thread_linux_arm.hpp"
1641 #endif
1642 #ifdef TARGET_OS_ARCH_linux_ppc
1643 # include "thread_linux_ppc.hpp"
1644 #endif
1645 #ifdef TARGET_OS_ARCH_bsd_x86
1646 # include "thread_bsd_x86.hpp"
1647 #endif
1648 #ifdef TARGET_OS_ARCH_bsd_zero
1649 # include "thread_bsd_zero.hpp"
1650 #endif
1653 public:
1654 void set_blocked_on_compilation(bool value) {
1655 _blocked_on_compilation = value;
1656 }
1658 bool blocked_on_compilation() {
1659 return _blocked_on_compilation;
1660 }
1661 protected:
1662 bool _blocked_on_compilation;
1665 // JSR166 per-thread parker
1666 private:
1667 Parker* _parker;
1668 public:
1669 Parker* parker() { return _parker; }
1671 // Biased locking support
1672 private:
1673 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1674 public:
1675 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1676 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1678 // clearing/querying jni attach status
1679 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1680 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1681 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); }
1682 private:
1683 // This field is used to determine if a thread has claimed
1684 // a par_id: it is -1 if the thread has not claimed a par_id;
1685 // otherwise its value is the par_id that has been claimed.
1686 int _claimed_par_id;
1687 public:
1688 int get_claimed_par_id() { return _claimed_par_id; }
1689 void set_claimed_par_id(int id) { _claimed_par_id = id;}
1690 };
1692 // Inline implementation of JavaThread::current
1693 inline JavaThread* JavaThread::current() {
1694 Thread* thread = ThreadLocalStorage::thread();
1695 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1696 return (JavaThread*)thread;
1697 }
1699 inline CompilerThread* JavaThread::as_CompilerThread() {
1700 assert(is_Compiler_thread(), "just checking");
1701 return (CompilerThread*)this;
1702 }
1704 inline bool JavaThread::stack_yellow_zone_disabled() {
1705 return _stack_guard_state == stack_guard_yellow_disabled;
1706 }
1708 inline bool JavaThread::stack_yellow_zone_enabled() {
1709 #ifdef ASSERT
1710 if (os::uses_stack_guard_pages()) {
1711 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1712 }
1713 #endif
1714 return _stack_guard_state == stack_guard_enabled;
1715 }
1717 inline size_t JavaThread::stack_available(address cur_sp) {
1718 // This code assumes java stacks grow down
1719 address low_addr; // Limit on the address for deepest stack depth
1720 if ( _stack_guard_state == stack_guard_unused) {
1721 low_addr = stack_base() - stack_size();
1722 } else {
1723 low_addr = stack_yellow_zone_base();
1724 }
1725 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1726 }
1728 // A thread used for Compilation.
1729 class CompilerThread : public JavaThread {
1730 friend class VMStructs;
1731 private:
1732 CompilerCounters* _counters;
1734 ciEnv* _env;
1735 CompileLog* _log;
1736 CompileTask* _task;
1737 CompileQueue* _queue;
1738 BufferBlob* _buffer_blob;
1740 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1742 public:
1744 static CompilerThread* current();
1746 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1748 bool is_Compiler_thread() const { return true; }
1749 // Hide this compiler thread from external view.
1750 bool is_hidden_from_external_view() const { return true; }
1752 CompileQueue* queue() { return _queue; }
1753 CompilerCounters* counters() { return _counters; }
1755 // Get/set the thread's compilation environment.
1756 ciEnv* env() { return _env; }
1757 void set_env(ciEnv* env) { _env = env; }
1759 BufferBlob* get_buffer_blob() { return _buffer_blob; }
1760 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1762 // Get/set the thread's logging information
1763 CompileLog* log() { return _log; }
1764 void init_log(CompileLog* log) {
1765 // Set once, for good.
1766 assert(_log == NULL, "set only once");
1767 _log = log;
1768 }
1770 // GC support
1771 // Apply "f->do_oop" to all root oops in "this".
1772 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1773 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1775 #ifndef PRODUCT
1776 private:
1777 IdealGraphPrinter *_ideal_graph_printer;
1778 public:
1779 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1780 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1781 #endif
1783 // Get/set the thread's current task
1784 CompileTask* task() { return _task; }
1785 void set_task(CompileTask* task) { _task = task; }
1787 // Track the nmethod currently being scanned by the sweeper
1788 void set_scanned_nmethod(nmethod* nm) {
1789 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1790 _scanned_nmethod = nm;
1791 }
1792 };
1794 inline CompilerThread* CompilerThread::current() {
1795 return JavaThread::current()->as_CompilerThread();
1796 }
1799 // The active thread queue. It also keeps track of the current used
1800 // thread priorities.
1801 class Threads: AllStatic {
1802 friend class VMStructs;
1803 private:
1804 static JavaThread* _thread_list;
1805 static int _number_of_threads;
1806 static int _number_of_non_daemon_threads;
1807 static int _return_code;
1809 public:
1810 // Thread management
1811 // force_daemon is a concession to JNI, where we may need to add a
1812 // thread to the thread list before allocating its thread object
1813 static void add(JavaThread* p, bool force_daemon = false);
1814 static void remove(JavaThread* p);
1815 static bool includes(JavaThread* p);
1816 static JavaThread* first() { return _thread_list; }
1817 static void threads_do(ThreadClosure* tc);
1819 // Initializes the vm and creates the vm thread
1820 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1821 static void convert_vm_init_libraries_to_agents();
1822 static void create_vm_init_libraries();
1823 static void create_vm_init_agents();
1824 static void shutdown_vm_agents();
1825 static bool destroy_vm();
1826 // Supported VM versions via JNI
1827 // Includes JNI_VERSION_1_1
1828 static jboolean is_supported_jni_version_including_1_1(jint version);
1829 // Does not include JNI_VERSION_1_1
1830 static jboolean is_supported_jni_version(jint version);
1832 // Garbage collection
1833 static void follow_other_roots(void f(oop*));
1835 // Apply "f->do_oop" to all root oops in all threads.
1836 // This version may only be called by sequential code.
1837 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
1838 // This version may be called by sequential or parallel code.
1839 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf);
1840 // This creates a list of GCTasks, one per thread.
1841 static void create_thread_roots_tasks(GCTaskQueue* q);
1842 // This creates a list of GCTasks, one per thread, for marking objects.
1843 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1845 // Apply "f->do_oop" to roots in all threads that
1846 // are part of compiled frames
1847 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1849 static void convert_hcode_pointers();
1850 static void restore_hcode_pointers();
1852 // Sweeper
1853 static void nmethods_do(CodeBlobClosure* cf);
1855 static void gc_epilogue();
1856 static void gc_prologue();
1858 // Verification
1859 static void verify();
1860 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1861 static void print(bool print_stacks, bool internal_format) {
1862 // this function is only used by debug.cpp
1863 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1864 }
1865 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1867 // Get Java threads that are waiting to enter a monitor. If doLock
1868 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1869 // VM needs to be at a safepoint.
1870 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1871 address monitor, bool doLock);
1873 // Get owning Java thread from the monitor's owner field. If doLock
1874 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1875 // VM needs to be at a safepoint.
1876 static JavaThread *owning_thread_from_monitor_owner(address owner,
1877 bool doLock);
1879 // Number of threads on the active threads list
1880 static int number_of_threads() { return _number_of_threads; }
1881 // Number of non-daemon threads on the active threads list
1882 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1884 // Deoptimizes all frames tied to marked nmethods
1885 static void deoptimized_wrt_marked_nmethods();
1887 };
1890 // Thread iterator
1891 class ThreadClosure: public StackObj {
1892 public:
1893 virtual void do_thread(Thread* thread) = 0;
1894 };
1896 class SignalHandlerMark: public StackObj {
1897 private:
1898 Thread* _thread;
1899 public:
1900 SignalHandlerMark(Thread* t) {
1901 _thread = t;
1902 if (_thread) _thread->enter_signal_handler();
1903 }
1904 ~SignalHandlerMark() {
1905 if (_thread) _thread->leave_signal_handler();
1906 _thread = NULL;
1907 }
1908 };
1911 #endif // SHARE_VM_RUNTIME_THREAD_HPP