Tue, 04 Jun 2013 19:39:21 -0700
8010257: remove unused thread-local variables _ScratchA and _ScratchB
Summary: Remove dead code.
Reviewed-by: twisti, coleenp
1 /*
2 * Copyright (c) 1997, 2013, 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/macros.hpp"
46 #if INCLUDE_NMT
47 #include "services/memRecorder.hpp"
48 #endif // INCLUDE_NMT
50 #include "trace/tracing.hpp"
51 #include "utilities/exceptions.hpp"
52 #include "utilities/top.hpp"
53 #if INCLUDE_ALL_GCS
54 #include "gc_implementation/g1/dirtyCardQueue.hpp"
55 #include "gc_implementation/g1/satbQueue.hpp"
56 #endif // INCLUDE_ALL_GCS
57 #ifdef ZERO
58 #ifdef TARGET_ARCH_zero
59 # include "stack_zero.hpp"
60 #endif
61 #endif
63 class ThreadSafepointState;
64 class ThreadProfiler;
66 class JvmtiThreadState;
67 class JvmtiGetLoadedClassesClosure;
68 class ThreadStatistics;
69 class ConcurrentLocksDump;
70 class ParkEvent;
71 class Parker;
73 class ciEnv;
74 class CompileThread;
75 class CompileLog;
76 class CompileTask;
77 class CompileQueue;
78 class CompilerCounters;
79 class vframeArray;
81 class DeoptResourceMark;
82 class jvmtiDeferredLocalVariableSet;
84 class GCTaskQueue;
85 class ThreadClosure;
86 class IdealGraphPrinter;
88 class WorkerThread;
90 // Class hierarchy
91 // - Thread
92 // - NamedThread
93 // - VMThread
94 // - ConcurrentGCThread
95 // - WorkerThread
96 // - GangWorker
97 // - GCTaskThread
98 // - JavaThread
99 // - WatcherThread
101 class Thread: public ThreadShadow {
102 friend class VMStructs;
103 private:
104 // Exception handling
105 // (Note: _pending_exception and friends are in ThreadShadow)
106 //oop _pending_exception; // pending exception for current thread
107 // const char* _exception_file; // file information for exception (debugging only)
108 // int _exception_line; // line information for exception (debugging only)
109 protected:
110 // Support for forcing alignment of thread objects for biased locking
111 void* _real_malloc_address;
112 public:
113 void* operator new(size_t size) { return allocate(size, true); }
114 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) { return allocate(size, false); }
115 void operator delete(void* p);
117 protected:
118 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
119 private:
121 // ***************************************************************
122 // Suspend and resume support
123 // ***************************************************************
124 //
125 // VM suspend/resume no longer exists - it was once used for various
126 // things including safepoints but was deprecated and finally removed
127 // in Java 7. Because VM suspension was considered "internal" Java-level
128 // suspension was considered "external", and this legacy naming scheme
129 // remains.
130 //
131 // External suspend/resume requests come from JVM_SuspendThread,
132 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
133 // ResumeThread. External
134 // suspend requests cause _external_suspend to be set and external
135 // resume requests cause _external_suspend to be cleared.
136 // External suspend requests do not nest on top of other external
137 // suspend requests. The higher level APIs reject suspend requests
138 // for already suspended threads.
139 //
140 // The external_suspend
141 // flag is checked by has_special_runtime_exit_condition() and java thread
142 // will self-suspend when handle_special_runtime_exit_condition() is
143 // called. Most uses of the _thread_blocked state in JavaThreads are
144 // considered the same as being externally suspended; if the blocking
145 // condition lifts, the JavaThread will self-suspend. Other places
146 // where VM checks for external_suspend include:
147 // + mutex granting (do not enter monitors when thread is suspended)
148 // + state transitions from _thread_in_native
149 //
150 // In general, java_suspend() does not wait for an external suspend
151 // request to complete. When it returns, the only guarantee is that
152 // the _external_suspend field is true.
153 //
154 // wait_for_ext_suspend_completion() is used to wait for an external
155 // suspend request to complete. External suspend requests are usually
156 // followed by some other interface call that requires the thread to
157 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
158 // the interface that requires quiescence, we give the JavaThread a
159 // chance to self-suspend before we need it to be quiescent. This
160 // improves overall suspend/query performance.
161 //
162 // _suspend_flags controls the behavior of java_ suspend/resume.
163 // It must be set under the protection of SR_lock. Read from the flag is
164 // OK without SR_lock as long as the value is only used as a hint.
165 // (e.g., check _external_suspend first without lock and then recheck
166 // inside SR_lock and finish the suspension)
167 //
168 // _suspend_flags is also overloaded for other "special conditions" so
169 // that a single check indicates whether any special action is needed
170 // eg. for async exceptions.
171 // -------------------------------------------------------------------
172 // Notes:
173 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
174 // but we still update its value to keep other part of the system (mainly
175 // JVMTI) happy. ThreadState is legacy code (see notes in
176 // osThread.hpp).
177 //
178 // 2. It would be more natural if set_external_suspend() is private and
179 // part of java_suspend(), but that probably would affect the suspend/query
180 // performance. Need more investigation on this.
181 //
183 // suspend/resume lock: used for self-suspend
184 Monitor* _SR_lock;
186 protected:
187 enum SuspendFlags {
188 // NOTE: avoid using the sign-bit as cc generates different test code
189 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
191 _external_suspend = 0x20000000U, // thread is asked to self suspend
192 _ext_suspended = 0x40000000U, // thread has self-suspended
193 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
195 _has_async_exception = 0x00000001U, // there is a pending async exception
196 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
197 };
199 // various suspension related flags - atomically updated
200 // overloaded for async exception checking in check_special_condition_for_native_trans.
201 volatile uint32_t _suspend_flags;
203 private:
204 int _num_nested_signal;
206 public:
207 void enter_signal_handler() { _num_nested_signal++; }
208 void leave_signal_handler() { _num_nested_signal--; }
209 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
211 private:
212 // Debug tracing
213 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
215 // Active_handles points to a block of handles
216 JNIHandleBlock* _active_handles;
218 // One-element thread local free list
219 JNIHandleBlock* _free_handle_block;
221 // Point to the last handle mark
222 HandleMark* _last_handle_mark;
224 // The parity of the last strong_roots iteration in which this thread was
225 // claimed as a task.
226 jint _oops_do_parity;
228 public:
229 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
230 HandleMark* last_handle_mark() const { return _last_handle_mark; }
231 private:
233 // debug support for checking if code does allow safepoints or not
234 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
235 // mutex, or blocking on an object synchronizer (Java locking).
236 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
237 // If !allow_allocation(), then an assertion failure will happen during allocation
238 // (Hence, !allow_safepoint() => !allow_allocation()).
239 //
240 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
241 //
242 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
243 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
245 // Used by SkipGCALot class.
246 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
248 // Record when GC is locked out via the GC_locker mechanism
249 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
251 friend class No_Alloc_Verifier;
252 friend class No_Safepoint_Verifier;
253 friend class Pause_No_Safepoint_Verifier;
254 friend class ThreadLocalStorage;
255 friend class GC_locker;
257 ThreadLocalAllocBuffer _tlab; // Thread-local eden
258 jlong _allocated_bytes; // Cumulative number of bytes allocated on
259 // the Java heap
261 TRACE_BUFFER _trace_buffer; // Thread-local buffer for tracing
263 int _vm_operation_started_count; // VM_Operation support
264 int _vm_operation_completed_count; // VM_Operation support
266 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
267 // is waiting to lock
268 bool _current_pending_monitor_is_from_java; // locking is from Java code
270 // ObjectMonitor on which this thread called Object.wait()
271 ObjectMonitor* _current_waiting_monitor;
273 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
274 public:
275 ObjectMonitor* omFreeList;
276 int omFreeCount; // length of omFreeList
277 int omFreeProvision; // reload chunk size
278 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
279 int omInUseCount; // length of omInUseList
281 #ifdef ASSERT
282 private:
283 bool _visited_for_critical_count;
285 public:
286 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
287 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
288 #endif
290 public:
291 enum {
292 is_definitely_current_thread = true
293 };
295 // Constructor
296 Thread();
297 virtual ~Thread();
299 // initializtion
300 void initialize_thread_local_storage();
302 // thread entry point
303 virtual void run();
305 // Testers
306 virtual bool is_VM_thread() const { return false; }
307 virtual bool is_Java_thread() const { return false; }
308 virtual bool is_Compiler_thread() const { return false; }
309 virtual bool is_hidden_from_external_view() const { return false; }
310 virtual bool is_jvmti_agent_thread() const { return false; }
311 // True iff the thread can perform GC operations at a safepoint.
312 // Generally will be true only of VM thread and parallel GC WorkGang
313 // threads.
314 virtual bool is_GC_task_thread() const { return false; }
315 virtual bool is_Watcher_thread() const { return false; }
316 virtual bool is_ConcurrentGC_thread() const { return false; }
317 virtual bool is_Named_thread() const { return false; }
318 virtual bool is_Worker_thread() const { return false; }
320 // Casts
321 virtual WorkerThread* as_Worker_thread() const { return NULL; }
323 virtual char* name() const { return (char*)"Unknown thread"; }
325 // Returns the current thread
326 static inline Thread* current();
328 // Common thread operations
329 static void set_priority(Thread* thread, ThreadPriority priority);
330 static ThreadPriority get_priority(const Thread* const thread);
331 static void start(Thread* thread);
332 static void interrupt(Thread* thr);
333 static bool is_interrupted(Thread* thr, bool clear_interrupted);
335 void set_native_thread_name(const char *name) {
336 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
337 os::set_native_thread_name(name);
338 }
340 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
341 Monitor* SR_lock() const { return _SR_lock; }
343 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
345 void set_suspend_flag(SuspendFlags f) {
346 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
347 uint32_t flags;
348 do {
349 flags = _suspend_flags;
350 }
351 while (Atomic::cmpxchg((jint)(flags | f),
352 (volatile jint*)&_suspend_flags,
353 (jint)flags) != (jint)flags);
354 }
355 void clear_suspend_flag(SuspendFlags f) {
356 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
357 uint32_t flags;
358 do {
359 flags = _suspend_flags;
360 }
361 while (Atomic::cmpxchg((jint)(flags & ~f),
362 (volatile jint*)&_suspend_flags,
363 (jint)flags) != (jint)flags);
364 }
366 void set_has_async_exception() {
367 set_suspend_flag(_has_async_exception);
368 }
369 void clear_has_async_exception() {
370 clear_suspend_flag(_has_async_exception);
371 }
373 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
375 void set_critical_native_unlock() {
376 set_suspend_flag(_critical_native_unlock);
377 }
378 void clear_critical_native_unlock() {
379 clear_suspend_flag(_critical_native_unlock);
380 }
382 // Support for Unhandled Oop detection
383 #ifdef CHECK_UNHANDLED_OOPS
384 private:
385 UnhandledOops* _unhandled_oops;
386 public:
387 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
388 // Mark oop safe for gc. It may be stack allocated but won't move.
389 void allow_unhandled_oop(oop *op) {
390 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
391 }
392 // Clear oops at safepoint so crashes point to unhandled oop violator
393 void clear_unhandled_oops() {
394 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
395 }
396 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
397 #endif // CHECK_UNHANDLED_OOPS
399 #ifndef PRODUCT
400 bool skip_gcalot() { return _skip_gcalot; }
401 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
402 #endif
404 public:
405 // Installs a pending exception to be inserted later
406 static void send_async_exception(oop thread_oop, oop java_throwable);
408 // Resource area
409 ResourceArea* resource_area() const { return _resource_area; }
410 void set_resource_area(ResourceArea* area) { _resource_area = area; }
412 OSThread* osthread() const { return _osthread; }
413 void set_osthread(OSThread* thread) { _osthread = thread; }
415 // JNI handle support
416 JNIHandleBlock* active_handles() const { return _active_handles; }
417 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
418 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
419 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
421 // Internal handle support
422 HandleArea* handle_area() const { return _handle_area; }
423 void set_handle_area(HandleArea* area) { _handle_area = area; }
425 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
426 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
428 // Thread-Local Allocation Buffer (TLAB) support
429 ThreadLocalAllocBuffer& tlab() { return _tlab; }
430 void initialize_tlab() {
431 if (UseTLAB) {
432 tlab().initialize();
433 }
434 }
436 jlong allocated_bytes() { return _allocated_bytes; }
437 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
438 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
439 jlong cooked_allocated_bytes() {
440 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
441 if (UseTLAB) {
442 size_t used_bytes = tlab().used_bytes();
443 if ((ssize_t)used_bytes > 0) {
444 // More-or-less valid tlab. The load_acquire above should ensure
445 // that the result of the add is <= the instantaneous value
446 return allocated_bytes + used_bytes;
447 }
448 }
449 return allocated_bytes;
450 }
452 TRACE_BUFFER trace_buffer() { return _trace_buffer; }
453 void set_trace_buffer(TRACE_BUFFER buf) { _trace_buffer = buf; }
455 // VM operation support
456 int vm_operation_ticket() { return ++_vm_operation_started_count; }
457 int vm_operation_completed_count() { return _vm_operation_completed_count; }
458 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
460 // For tracking the heavyweight monitor the thread is pending on.
461 ObjectMonitor* current_pending_monitor() {
462 return _current_pending_monitor;
463 }
464 void set_current_pending_monitor(ObjectMonitor* monitor) {
465 _current_pending_monitor = monitor;
466 }
467 void set_current_pending_monitor_is_from_java(bool from_java) {
468 _current_pending_monitor_is_from_java = from_java;
469 }
470 bool current_pending_monitor_is_from_java() {
471 return _current_pending_monitor_is_from_java;
472 }
474 // For tracking the ObjectMonitor on which this thread called Object.wait()
475 ObjectMonitor* current_waiting_monitor() {
476 return _current_waiting_monitor;
477 }
478 void set_current_waiting_monitor(ObjectMonitor* monitor) {
479 _current_waiting_monitor = monitor;
480 }
482 // GC support
483 // Apply "f->do_oop" to all root oops in "this".
484 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
485 // Used by JavaThread::oops_do.
486 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
487 virtual void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
489 // Handles the parallel case for the method below.
490 private:
491 bool claim_oops_do_par_case(int collection_parity);
492 public:
493 // Requires that "collection_parity" is that of the current strong roots
494 // iteration. If "is_par" is false, sets the parity of "this" to
495 // "collection_parity", and returns "true". If "is_par" is true,
496 // uses an atomic instruction to set the current threads parity to
497 // "collection_parity", if it is not already. Returns "true" iff the
498 // calling thread does the update, this indicates that the calling thread
499 // has claimed the thread's stack as a root groop in the current
500 // collection.
501 bool claim_oops_do(bool is_par, int collection_parity) {
502 if (!is_par) {
503 _oops_do_parity = collection_parity;
504 return true;
505 } else {
506 return claim_oops_do_par_case(collection_parity);
507 }
508 }
510 // Sweeper support
511 void nmethods_do(CodeBlobClosure* cf);
513 // jvmtiRedefineClasses support
514 void metadata_do(void f(Metadata*));
516 // Used by fast lock support
517 virtual bool is_lock_owned(address adr) const;
519 // Check if address is in the stack of the thread (not just for locks).
520 // Warning: the method can only be used on the running thread
521 bool is_in_stack(address adr) const;
523 // Sets this thread as starting thread. Returns failure if thread
524 // creation fails due to lack of memory, too many threads etc.
525 bool set_as_starting_thread();
527 protected:
528 // OS data associated with the thread
529 OSThread* _osthread; // Platform-specific thread information
531 // Thread local resource area for temporary allocation within the VM
532 ResourceArea* _resource_area;
534 // Thread local handle area for allocation of handles within the VM
535 HandleArea* _handle_area;
536 GrowableArray<Metadata*>* _metadata_handles;
538 // Support for stack overflow handling, get_thread, etc.
539 address _stack_base;
540 size_t _stack_size;
541 uintptr_t _self_raw_id; // used by get_thread (mutable)
542 int _lgrp_id;
544 public:
545 // Stack overflow support
546 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
548 void set_stack_base(address base) { _stack_base = base; }
549 size_t stack_size() const { return _stack_size; }
550 void set_stack_size(size_t size) { _stack_size = size; }
551 void record_stack_base_and_size();
553 bool on_local_stack(address adr) const {
554 /* QQQ this has knowledge of direction, ought to be a stack method */
555 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
556 }
558 uintptr_t self_raw_id() { return _self_raw_id; }
559 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
561 int lgrp_id() const { return _lgrp_id; }
562 void set_lgrp_id(int value) { _lgrp_id = value; }
564 // Printing
565 void print_on(outputStream* st) const;
566 void print() const { print_on(tty); }
567 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
569 // Debug-only code
570 #ifdef ASSERT
571 private:
572 // Deadlock detection support for Mutex locks. List of locks own by thread.
573 Monitor* _owned_locks;
574 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
575 // thus the friendship
576 friend class Mutex;
577 friend class Monitor;
579 public:
580 void print_owned_locks_on(outputStream* st) const;
581 void print_owned_locks() const { print_owned_locks_on(tty); }
582 Monitor* owned_locks() const { return _owned_locks; }
583 bool owns_locks() const { return owned_locks() != NULL; }
584 bool owns_locks_but_compiled_lock() const;
586 // Deadlock detection
587 bool allow_allocation() { return _allow_allocation_count == 0; }
588 #endif
590 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
592 private:
593 volatile int _jvmti_env_iteration_count;
595 public:
596 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
597 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
598 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
600 // Code generation
601 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
602 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
603 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
605 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
606 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
608 #define TLAB_FIELD_OFFSET(name) \
609 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
611 TLAB_FIELD_OFFSET(start)
612 TLAB_FIELD_OFFSET(end)
613 TLAB_FIELD_OFFSET(top)
614 TLAB_FIELD_OFFSET(pf_top)
615 TLAB_FIELD_OFFSET(size) // desired_size
616 TLAB_FIELD_OFFSET(refill_waste_limit)
617 TLAB_FIELD_OFFSET(number_of_refills)
618 TLAB_FIELD_OFFSET(fast_refill_waste)
619 TLAB_FIELD_OFFSET(slow_allocations)
621 #undef TLAB_FIELD_OFFSET
623 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
625 public:
626 volatile intptr_t _Stalled ;
627 volatile int _TypeTag ;
628 ParkEvent * _ParkEvent ; // for synchronized()
629 ParkEvent * _SleepEvent ; // for Thread.sleep
630 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
631 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
632 int NativeSyncRecursion ; // diagnostic
634 volatile int _OnTrap ; // Resume-at IP delta
635 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
636 jint _hashStateX ; // thread-specific hashCode generator state
637 jint _hashStateY ;
638 jint _hashStateZ ;
639 void * _schedctl ;
642 volatile jint rng [4] ; // RNG for spin loop
644 // Low-level leaf-lock primitives used to implement synchronization
645 // and native monitor-mutex infrastructure.
646 // Not for general synchronization use.
647 static void SpinAcquire (volatile int * Lock, const char * Name) ;
648 static void SpinRelease (volatile int * Lock) ;
649 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
650 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
651 static void muxRelease (volatile intptr_t * Lock) ;
652 };
654 // Inline implementation of Thread::current()
655 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
656 // startup.
657 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
658 // period. This is inlined in thread_<os_family>.inline.hpp.
660 inline Thread* Thread::current() {
661 #ifdef ASSERT
662 // This function is very high traffic. Define PARANOID to enable expensive
663 // asserts.
664 #ifdef PARANOID
665 // Signal handler should call ThreadLocalStorage::get_thread_slow()
666 Thread* t = ThreadLocalStorage::get_thread_slow();
667 assert(t != NULL && !t->is_inside_signal_handler(),
668 "Don't use Thread::current() inside signal handler");
669 #endif
670 #endif
671 Thread* thread = ThreadLocalStorage::thread();
672 assert(thread != NULL, "just checking");
673 return thread;
674 }
676 // Name support for threads. non-JavaThread subclasses with multiple
677 // uniquely named instances should derive from this.
678 class NamedThread: public Thread {
679 friend class VMStructs;
680 enum {
681 max_name_len = 64
682 };
683 private:
684 char* _name;
685 // log JavaThread being processed by oops_do
686 JavaThread* _processed_thread;
688 public:
689 NamedThread();
690 ~NamedThread();
691 // May only be called once per thread.
692 void set_name(const char* format, ...);
693 virtual bool is_Named_thread() const { return true; }
694 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
695 JavaThread *processed_thread() { return _processed_thread; }
696 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
697 };
699 // Worker threads are named and have an id of an assigned work.
700 class WorkerThread: public NamedThread {
701 private:
702 uint _id;
703 public:
704 WorkerThread() : _id(0) { }
705 virtual bool is_Worker_thread() const { return true; }
707 virtual WorkerThread* as_Worker_thread() const {
708 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
709 return (WorkerThread*) this;
710 }
712 void set_id(uint work_id) { _id = work_id; }
713 uint id() const { return _id; }
714 };
716 // A single WatcherThread is used for simulating timer interrupts.
717 class WatcherThread: public Thread {
718 friend class VMStructs;
719 public:
720 virtual void run();
722 private:
723 static WatcherThread* _watcher_thread;
725 static bool _startable;
726 volatile static bool _should_terminate; // updated without holding lock
727 public:
728 enum SomeConstants {
729 delay_interval = 10 // interrupt delay in milliseconds
730 };
732 // Constructor
733 WatcherThread();
735 // Tester
736 bool is_Watcher_thread() const { return true; }
738 // Printing
739 char* name() const { return (char*)"VM Periodic Task Thread"; }
740 void print_on(outputStream* st) const;
741 void print() const { print_on(tty); }
742 void unpark();
744 // Returns the single instance of WatcherThread
745 static WatcherThread* watcher_thread() { return _watcher_thread; }
747 // Create and start the single instance of WatcherThread, or stop it on shutdown
748 static void start();
749 static void stop();
750 // Only allow start once the VM is sufficiently initialized
751 // Otherwise the first task to enroll will trigger the start
752 static void make_startable();
754 private:
755 int sleep() const;
756 };
759 class CompilerThread;
761 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
763 class JavaThread: public Thread {
764 friend class VMStructs;
765 private:
766 JavaThread* _next; // The next thread in the Threads list
767 oop _threadObj; // The Java level thread object
769 #ifdef ASSERT
770 private:
771 int _java_call_counter;
773 public:
774 int java_call_counter() { return _java_call_counter; }
775 void inc_java_call_counter() { _java_call_counter++; }
776 void dec_java_call_counter() {
777 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
778 _java_call_counter--;
779 }
780 private: // restore original namespace restriction
781 #endif // ifdef ASSERT
783 #ifndef PRODUCT
784 public:
785 enum {
786 jump_ring_buffer_size = 16
787 };
788 private: // restore original namespace restriction
789 #endif
791 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
793 ThreadFunction _entry_point;
795 JNIEnv _jni_environment;
797 // Deopt support
798 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
800 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
801 // transition out of native
802 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
803 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
804 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
805 // Because deoptimization is lazy we must save jvmti requests to set locals
806 // in compiled frames until we deoptimize and we have an interpreter frame.
807 // This holds the pointer to array (yeah like there might be more than one) of
808 // description of compiled vframes that have locals that need to be updated.
809 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
811 // Handshake value for fixing 6243940. We need a place for the i2c
812 // adapter to store the callee Method*. This value is NEVER live
813 // across a gc point so it does NOT have to be gc'd
814 // The handshake is open ended since we can't be certain that it will
815 // be NULLed. This is because we rarely ever see the race and end up
816 // in handle_wrong_method which is the backend of the handshake. See
817 // code in i2c adapters and handle_wrong_method.
819 Method* _callee_target;
821 // Used to pass back results to the interpreter or generated code running Java code.
822 oop _vm_result; // oop result is GC-preserved
823 Metadata* _vm_result_2; // non-oop result
825 // See ReduceInitialCardMarks: this holds the precise space interval of
826 // the most recent slow path allocation for which compiled code has
827 // elided card-marks for performance along the fast-path.
828 MemRegion _deferred_card_mark;
830 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
831 // allocated during deoptimization
832 // and by JNI_MonitorEnter/Exit
834 // Async. requests support
835 enum AsyncRequests {
836 _no_async_condition = 0,
837 _async_exception,
838 _async_unsafe_access_error
839 };
840 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
841 oop _pending_async_exception;
843 // Safepoint support
844 public: // Expose _thread_state for SafeFetchInt()
845 volatile JavaThreadState _thread_state;
846 private:
847 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
848 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
850 // JavaThread termination support
851 enum TerminatedTypes {
852 _not_terminated = 0xDEAD - 2,
853 _thread_exiting, // JavaThread::exit() has been called for this thread
854 _thread_terminated, // JavaThread is removed from thread list
855 _vm_exited // JavaThread is still executing native code, but VM is terminated
856 // only VM_Exit can set _vm_exited
857 };
859 // In general a JavaThread's _terminated field transitions as follows:
860 //
861 // _not_terminated => _thread_exiting => _thread_terminated
862 //
863 // _vm_exited is a special value to cover the case of a JavaThread
864 // executing native code after the VM itself is terminated.
865 volatile TerminatedTypes _terminated;
866 // suspend/resume support
867 volatile bool _suspend_equivalent; // Suspend equivalent condition
868 jint _in_deopt_handler; // count of deoptimization
869 // handlers thread is in
870 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
871 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
872 // never locked) when throwing an exception. Used by interpreter only.
874 // JNI attach states:
875 enum JNIAttachStates {
876 _not_attaching_via_jni = 1, // thread is not attaching via JNI
877 _attaching_via_jni, // thread is attaching via JNI
878 _attached_via_jni // thread has attached via JNI
879 };
881 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
882 // A native thread that is attaching via JNI starts with a value
883 // of _attaching_via_jni and transitions to _attached_via_jni.
884 volatile JNIAttachStates _jni_attach_state;
886 public:
887 // State of the stack guard pages for this thread.
888 enum StackGuardState {
889 stack_guard_unused, // not needed
890 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
891 stack_guard_enabled // enabled
892 };
894 private:
896 StackGuardState _stack_guard_state;
898 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
899 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
900 // code)
901 volatile oop _exception_oop; // Exception thrown in compiled code
902 volatile address _exception_pc; // PC where exception happened
903 volatile address _exception_handler_pc; // PC for handler of exception
904 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
906 // support for compilation
907 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
909 // support for JNI critical regions
910 jint _jni_active_critical; // count of entries into JNI critical region
912 // For deadlock detection.
913 int _depth_first_number;
915 // JVMTI PopFrame support
916 // This is set to popframe_pending to signal that top Java frame should be popped immediately
917 int _popframe_condition;
919 #ifndef PRODUCT
920 int _jmp_ring_index;
921 struct {
922 // We use intptr_t instead of address so debugger doesn't try and display strings
923 intptr_t _target;
924 intptr_t _instruction;
925 const char* _file;
926 int _line;
927 } _jmp_ring[ jump_ring_buffer_size ];
928 #endif /* PRODUCT */
930 #if INCLUDE_ALL_GCS
931 // Support for G1 barriers
933 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
934 // Set of all such queues.
935 static SATBMarkQueueSet _satb_mark_queue_set;
937 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
938 // Set of all such queues.
939 static DirtyCardQueueSet _dirty_card_queue_set;
941 void flush_barrier_queues();
942 #endif // INCLUDE_ALL_GCS
944 friend class VMThread;
945 friend class ThreadWaitTransition;
946 friend class VM_Exit;
948 void initialize(); // Initialized the instance variables
950 public:
951 // Constructor
952 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
953 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
954 ~JavaThread();
956 #ifdef ASSERT
957 // verify this JavaThread hasn't be published in the Threads::list yet
958 void verify_not_published();
959 #endif
961 //JNI functiontable getter/setter for JVMTI jni function table interception API.
962 void set_jni_functions(struct JNINativeInterface_* functionTable) {
963 _jni_environment.functions = functionTable;
964 }
965 struct JNINativeInterface_* get_jni_functions() {
966 return (struct JNINativeInterface_ *)_jni_environment.functions;
967 }
969 // This function is called at thread creation to allow
970 // platform specific thread variables to be initialized.
971 void cache_global_variables();
973 // Executes Shutdown.shutdown()
974 void invoke_shutdown_hooks();
976 // Cleanup on thread exit
977 enum ExitType {
978 normal_exit,
979 jni_detach
980 };
981 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
983 void cleanup_failed_attach_current_thread();
985 // Testers
986 virtual bool is_Java_thread() const { return true; }
988 // compilation
989 void set_is_compiling(bool f) { _is_compiling = f; }
990 bool is_compiling() const { return _is_compiling; }
992 // Thread chain operations
993 JavaThread* next() const { return _next; }
994 void set_next(JavaThread* p) { _next = p; }
996 // Thread oop. threadObj() can be NULL for initial JavaThread
997 // (or for threads attached via JNI)
998 oop threadObj() const { return _threadObj; }
999 void set_threadObj(oop p) { _threadObj = p; }
1001 ThreadPriority java_priority() const; // Read from threadObj()
1003 // Prepare thread and add to priority queue. If a priority is
1004 // not specified, use the priority of the thread object. Threads_lock
1005 // must be held while this function is called.
1006 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1008 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1009 address saved_exception_pc() { return _saved_exception_pc; }
1012 ThreadFunction entry_point() const { return _entry_point; }
1014 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1015 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1017 // Last frame anchor routines
1019 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1021 // last_Java_sp
1022 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1023 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1025 // last_Java_pc
1027 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1029 // Safepoint support
1030 JavaThreadState thread_state() const { return _thread_state; }
1031 void set_thread_state(JavaThreadState s) { _thread_state=s; }
1032 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1033 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1034 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1036 // thread has called JavaThread::exit() or is terminated
1037 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1038 // thread is terminated (no longer on the threads list); we compare
1039 // against the two non-terminated values so that a freed JavaThread
1040 // will also be considered terminated.
1041 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1042 void set_terminated(TerminatedTypes t) { _terminated = t; }
1043 // special for Threads::remove() which is static:
1044 void set_terminated_value() { _terminated = _thread_terminated; }
1045 void block_if_vm_exited();
1047 bool doing_unsafe_access() { return _doing_unsafe_access; }
1048 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1050 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1051 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1053 #if INCLUDE_NMT
1054 // native memory tracking
1055 inline MemRecorder* get_recorder() const { return (MemRecorder*)_recorder; }
1056 inline void set_recorder(MemRecorder* rc) { _recorder = rc; }
1058 private:
1059 // per-thread memory recorder
1060 MemRecorder* volatile _recorder;
1061 #endif // INCLUDE_NMT
1063 // Suspend/resume support for JavaThread
1064 private:
1065 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1066 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1068 public:
1069 void java_suspend();
1070 void java_resume();
1071 int java_suspend_self();
1073 void check_and_wait_while_suspended() {
1074 assert(JavaThread::current() == this, "sanity check");
1076 bool do_self_suspend;
1077 do {
1078 // were we externally suspended while we were waiting?
1079 do_self_suspend = handle_special_suspend_equivalent_condition();
1080 if (do_self_suspend) {
1081 // don't surprise the thread that suspended us by returning
1082 java_suspend_self();
1083 set_suspend_equivalent();
1084 }
1085 } while (do_self_suspend);
1086 }
1087 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1088 // Check for async exception in addition to safepoint and suspend request.
1089 static void check_special_condition_for_native_trans(JavaThread *thread);
1091 // Same as check_special_condition_for_native_trans but finishes the
1092 // transition into thread_in_Java mode so that it can potentially
1093 // block.
1094 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1096 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1097 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1098 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1099 // Warning: is_ext_suspend_completed() may temporarily drop the
1100 // SR_lock to allow the thread to reach a stable thread state if
1101 // it is currently in a transient thread state.
1102 return is_ext_suspend_completed(false /*!called_by_wait */,
1103 SuspendRetryDelay, bits);
1104 }
1106 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1107 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1108 // passed as the count and delay parameters. Experiments with specific
1109 // calls to wait_for_ext_suspend_completion() can be done by passing
1110 // other values in the code. Experiments with all calls can be done
1111 // via the appropriate -XX options.
1112 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1114 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1115 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1117 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1118 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1119 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1121 bool is_external_suspend() const {
1122 return (_suspend_flags & _external_suspend) != 0;
1123 }
1124 // Whenever a thread transitions from native to vm/java it must suspend
1125 // if external|deopt suspend is present.
1126 bool is_suspend_after_native() const {
1127 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1128 }
1130 // external suspend request is completed
1131 bool is_ext_suspended() const {
1132 return (_suspend_flags & _ext_suspended) != 0;
1133 }
1135 bool is_external_suspend_with_lock() const {
1136 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1137 return is_external_suspend();
1138 }
1140 // Special method to handle a pending external suspend request
1141 // when a suspend equivalent condition lifts.
1142 bool handle_special_suspend_equivalent_condition() {
1143 assert(is_suspend_equivalent(),
1144 "should only be called in a suspend equivalence condition");
1145 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1146 bool ret = is_external_suspend();
1147 if (!ret) {
1148 // not about to self-suspend so clear suspend equivalence
1149 clear_suspend_equivalent();
1150 }
1151 // implied else:
1152 // We have a pending external suspend request so we leave the
1153 // suspend_equivalent flag set until java_suspend_self() sets
1154 // the ext_suspended flag and clears the suspend_equivalent
1155 // flag. This insures that wait_for_ext_suspend_completion()
1156 // will return consistent values.
1157 return ret;
1158 }
1160 // utility methods to see if we are doing some kind of suspension
1161 bool is_being_ext_suspended() const {
1162 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1163 return is_ext_suspended() || is_external_suspend();
1164 }
1166 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1168 void set_suspend_equivalent() { _suspend_equivalent = true; };
1169 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1171 // Thread.stop support
1172 void send_thread_stop(oop throwable);
1173 AsyncRequests clear_special_runtime_exit_condition() {
1174 AsyncRequests x = _special_runtime_exit_condition;
1175 _special_runtime_exit_condition = _no_async_condition;
1176 return x;
1177 }
1179 // Are any async conditions present?
1180 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1182 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1184 // these next two are also used for self-suspension and async exception support
1185 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1187 // Return true if JavaThread has an asynchronous condition or
1188 // if external suspension is requested.
1189 bool has_special_runtime_exit_condition() {
1190 // We call is_external_suspend() last since external suspend should
1191 // be less common. Because we don't use is_external_suspend_with_lock
1192 // it is possible that we won't see an asynchronous external suspend
1193 // request that has just gotten started, i.e., SR_lock grabbed but
1194 // _external_suspend field change either not made yet or not visible
1195 // yet. However, this is okay because the request is asynchronous and
1196 // we will see the new flag value the next time through. It's also
1197 // possible that the external suspend request is dropped after
1198 // we have checked is_external_suspend(), we will recheck its value
1199 // under SR_lock in java_suspend_self().
1200 return (_special_runtime_exit_condition != _no_async_condition) ||
1201 is_external_suspend() || is_deopt_suspend();
1202 }
1204 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1206 void set_pending_async_exception(oop e) {
1207 _pending_async_exception = e;
1208 _special_runtime_exit_condition = _async_exception;
1209 set_has_async_exception();
1210 }
1212 // Fast-locking support
1213 bool is_lock_owned(address adr) const;
1215 // Accessors for vframe array top
1216 // The linked list of vframe arrays are sorted on sp. This means when we
1217 // unpack the head must contain the vframe array to unpack.
1218 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1219 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1221 // Side structure for defering update of java frame locals until deopt occurs
1222 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1223 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1225 // These only really exist to make debugging deopt problems simpler
1227 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1228 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1230 // The special resourceMark used during deoptimization
1232 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1233 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1235 intptr_t* must_deopt_id() { return _must_deopt_id; }
1236 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1237 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1239 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1240 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1242 Method* callee_target() const { return _callee_target; }
1243 void set_callee_target (Method* x) { _callee_target = x; }
1245 // Oop results of vm runtime calls
1246 oop vm_result() const { return _vm_result; }
1247 void set_vm_result (oop x) { _vm_result = x; }
1249 Metadata* vm_result_2() const { return _vm_result_2; }
1250 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1252 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1253 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1255 // Exception handling for compiled methods
1256 oop exception_oop() const { return _exception_oop; }
1257 address exception_pc() const { return _exception_pc; }
1258 address exception_handler_pc() const { return _exception_handler_pc; }
1259 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1261 void set_exception_oop(oop o) { _exception_oop = o; }
1262 void set_exception_pc(address a) { _exception_pc = a; }
1263 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1264 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1266 // Stack overflow support
1267 inline size_t stack_available(address cur_sp);
1268 address stack_yellow_zone_base()
1269 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1270 size_t stack_yellow_zone_size()
1271 { return StackYellowPages * os::vm_page_size(); }
1272 address stack_red_zone_base()
1273 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1274 size_t stack_red_zone_size()
1275 { return StackRedPages * os::vm_page_size(); }
1276 bool in_stack_yellow_zone(address a)
1277 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1278 bool in_stack_red_zone(address a)
1279 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1281 void create_stack_guard_pages();
1282 void remove_stack_guard_pages();
1284 void enable_stack_yellow_zone();
1285 void disable_stack_yellow_zone();
1286 void enable_stack_red_zone();
1287 void disable_stack_red_zone();
1289 inline bool stack_guard_zone_unused();
1290 inline bool stack_yellow_zone_disabled();
1291 inline bool stack_yellow_zone_enabled();
1293 // Attempt to reguard the stack after a stack overflow may have occurred.
1294 // Returns true if (a) guard pages are not needed on this thread, (b) the
1295 // pages are already guarded, or (c) the pages were successfully reguarded.
1296 // Returns false if there is not enough stack space to reguard the pages, in
1297 // which case the caller should unwind a frame and try again. The argument
1298 // should be the caller's (approximate) sp.
1299 bool reguard_stack(address cur_sp);
1300 // Similar to above but see if current stackpoint is out of the guard area
1301 // and reguard if possible.
1302 bool reguard_stack(void);
1304 // Misc. accessors/mutators
1305 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1306 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1307 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1309 #ifndef PRODUCT
1310 void record_jump(address target, address instr, const char* file, int line);
1311 #endif /* PRODUCT */
1313 // For assembly stub generation
1314 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1315 #ifndef PRODUCT
1316 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1317 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1318 #endif /* PRODUCT */
1319 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1320 static ByteSize last_Java_sp_offset() {
1321 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1322 }
1323 static ByteSize last_Java_pc_offset() {
1324 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1325 }
1326 static ByteSize frame_anchor_offset() {
1327 return byte_offset_of(JavaThread, _anchor);
1328 }
1329 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1330 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1331 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1332 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1333 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1334 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1335 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1336 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1337 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1338 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1339 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1340 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1342 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1343 static ByteSize should_post_on_exceptions_flag_offset() {
1344 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1345 }
1347 #if INCLUDE_ALL_GCS
1348 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1349 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1350 #endif // INCLUDE_ALL_GCS
1352 // Returns the jni environment for this thread
1353 JNIEnv* jni_environment() { return &_jni_environment; }
1355 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1356 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1357 // Only return NULL if thread is off the thread list; starting to
1358 // exit should not return NULL.
1359 if (thread_from_jni_env->is_terminated()) {
1360 thread_from_jni_env->block_if_vm_exited();
1361 return NULL;
1362 } else {
1363 return thread_from_jni_env;
1364 }
1365 }
1367 // JNI critical regions. These can nest.
1368 bool in_critical() { return _jni_active_critical > 0; }
1369 bool in_last_critical() { return _jni_active_critical == 1; }
1370 void enter_critical() { assert(Thread::current() == this ||
1371 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1372 "this must be current thread or synchronizing");
1373 _jni_active_critical++; }
1374 void exit_critical() { assert(Thread::current() == this,
1375 "this must be current thread");
1376 _jni_active_critical--;
1377 assert(_jni_active_critical >= 0,
1378 "JNI critical nesting problem?"); }
1380 // For deadlock detection
1381 int depth_first_number() { return _depth_first_number; }
1382 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1384 private:
1385 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1387 public:
1388 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1389 void add_monitor_chunk(MonitorChunk* chunk);
1390 void remove_monitor_chunk(MonitorChunk* chunk);
1391 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1392 void inc_in_deopt_handler() { _in_deopt_handler++; }
1393 void dec_in_deopt_handler() {
1394 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1395 if (_in_deopt_handler > 0) { // robustness
1396 _in_deopt_handler--;
1397 }
1398 }
1400 private:
1401 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1403 public:
1405 // Frame iteration; calls the function f for all frames on the stack
1406 void frames_do(void f(frame*, const RegisterMap*));
1408 // Memory operations
1409 void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1411 // Sweeper operations
1412 void nmethods_do(CodeBlobClosure* cf);
1414 // RedefineClasses Support
1415 void metadata_do(void f(Metadata*));
1417 // Memory management operations
1418 void gc_epilogue();
1419 void gc_prologue();
1421 // Misc. operations
1422 char* name() const { return (char*)get_thread_name(); }
1423 void print_on(outputStream* st) const;
1424 void print() const { print_on(tty); }
1425 void print_value();
1426 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1427 void print_thread_state() const PRODUCT_RETURN;
1428 void print_on_error(outputStream* st, char* buf, int buflen) const;
1429 void verify();
1430 const char* get_thread_name() const;
1431 private:
1432 // factor out low-level mechanics for use in both normal and error cases
1433 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1434 public:
1435 const char* get_threadgroup_name() const;
1436 const char* get_parent_name() const;
1438 // Accessing frames
1439 frame last_frame() {
1440 _anchor.make_walkable(this);
1441 return pd_last_frame();
1442 }
1443 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1445 // Returns method at 'depth' java or native frames down the stack
1446 // Used for security checks
1447 Klass* security_get_caller_class(int depth);
1449 // Print stack trace in external format
1450 void print_stack_on(outputStream* st);
1451 void print_stack() { print_stack_on(tty); }
1453 // Print stack traces in various internal formats
1454 void trace_stack() PRODUCT_RETURN;
1455 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1456 void trace_frames() PRODUCT_RETURN;
1457 void trace_oops() PRODUCT_RETURN;
1459 // Print an annotated view of the stack frames
1460 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1461 void validate_frame_layout() {
1462 print_frame_layout(0, true);
1463 }
1465 // Returns the number of stack frames on the stack
1466 int depth() const;
1468 // Function for testing deoptimization
1469 void deoptimize();
1470 void make_zombies();
1472 void deoptimized_wrt_marked_nmethods();
1474 // Profiling operation (see fprofile.cpp)
1475 public:
1476 bool profile_last_Java_frame(frame* fr);
1478 private:
1479 ThreadProfiler* _thread_profiler;
1480 private:
1481 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1482 friend class FlatProfilerTask; // uses get_thread_profiler.
1483 friend class ThreadProfilerMark; // uses get_thread_profiler.
1484 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1485 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1486 ThreadProfiler* result = _thread_profiler;
1487 _thread_profiler = tp;
1488 return result;
1489 }
1491 // NMT (Native memory tracking) support.
1492 // This flag helps NMT to determine if this JavaThread will be blocked
1493 // at safepoint. If not, ThreadCritical is needed for writing memory records.
1494 // JavaThread is only safepoint visible when it is in Threads' thread list,
1495 // it is not visible until it is added to the list and becomes invisible
1496 // once it is removed from the list.
1497 public:
1498 bool is_safepoint_visible() const { return _safepoint_visible; }
1499 void set_safepoint_visible(bool visible) { _safepoint_visible = visible; }
1500 private:
1501 bool _safepoint_visible;
1503 // Static operations
1504 public:
1505 // Returns the running thread as a JavaThread
1506 static inline JavaThread* current();
1508 // Returns the active Java thread. Do not use this if you know you are calling
1509 // from a JavaThread, as it's slower than JavaThread::current. If called from
1510 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1511 // operation. You may not want that either.
1512 static JavaThread* active();
1514 inline CompilerThread* as_CompilerThread();
1516 public:
1517 virtual void run();
1518 void thread_main_inner();
1520 private:
1521 // PRIVILEGED STACK
1522 PrivilegedElement* _privileged_stack_top;
1523 GrowableArray<oop>* _array_for_gc;
1524 public:
1526 // Returns the privileged_stack information.
1527 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1528 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1529 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1531 public:
1532 // Thread local information maintained by JVMTI.
1533 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1534 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1535 // getter is used to get this JavaThread's JvmtiThreadState if it has
1536 // one which means NULL can be returned. JvmtiThreadState::state_for()
1537 // is used to get the specified JavaThread's JvmtiThreadState if it has
1538 // one or it allocates a new JvmtiThreadState for the JavaThread and
1539 // returns it. JvmtiThreadState::state_for() will return NULL only if
1540 // the specified JavaThread is exiting.
1541 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1542 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1543 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1544 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1546 // JVMTI PopFrame support
1547 // Setting and clearing popframe_condition
1548 // All of these enumerated values are bits. popframe_pending
1549 // indicates that a PopFrame() has been requested and not yet been
1550 // completed. popframe_processing indicates that that PopFrame() is in
1551 // the process of being completed. popframe_force_deopt_reexecution_bit
1552 // indicates that special handling is required when returning to a
1553 // deoptimized caller.
1554 enum PopCondition {
1555 popframe_inactive = 0x00,
1556 popframe_pending_bit = 0x01,
1557 popframe_processing_bit = 0x02,
1558 popframe_force_deopt_reexecution_bit = 0x04
1559 };
1560 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1561 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1562 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1563 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1564 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1565 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1566 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1567 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1568 #ifdef CC_INTERP
1569 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1570 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1571 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1572 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1573 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1574 #endif
1576 private:
1577 // Saved incoming arguments to popped frame.
1578 // Used only when popped interpreted frame returns to deoptimized frame.
1579 void* _popframe_preserved_args;
1580 int _popframe_preserved_args_size;
1582 public:
1583 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1584 void* popframe_preserved_args();
1585 ByteSize popframe_preserved_args_size();
1586 WordSize popframe_preserved_args_size_in_words();
1587 void popframe_free_preserved_args();
1590 private:
1591 JvmtiThreadState *_jvmti_thread_state;
1592 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1594 // Used by the interpreter in fullspeed mode for frame pop, method
1595 // entry, method exit and single stepping support. This field is
1596 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1597 // It can be set to zero asynchronously (i.e., without a VM operation
1598 // or a lock) so we have to be very careful.
1599 int _interp_only_mode;
1601 public:
1602 // used by the interpreter for fullspeed debugging support (see above)
1603 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1604 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1605 int get_interp_only_mode() { return _interp_only_mode; }
1606 void increment_interp_only_mode() { ++_interp_only_mode; }
1607 void decrement_interp_only_mode() { --_interp_only_mode; }
1609 // support for cached flag that indicates whether exceptions need to be posted for this thread
1610 // if this is false, we can avoid deoptimizing when events are thrown
1611 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1612 private:
1613 int _should_post_on_exceptions_flag;
1615 public:
1616 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1617 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1619 private:
1620 ThreadStatistics *_thread_stat;
1622 public:
1623 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1625 // Return a blocker object for which this thread is blocked parking.
1626 oop current_park_blocker();
1628 private:
1629 static size_t _stack_size_at_create;
1631 public:
1632 static inline size_t stack_size_at_create(void) {
1633 return _stack_size_at_create;
1634 }
1635 static inline void set_stack_size_at_create(size_t value) {
1636 _stack_size_at_create = value;
1637 }
1639 #if INCLUDE_ALL_GCS
1640 // SATB marking queue support
1641 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1642 static SATBMarkQueueSet& satb_mark_queue_set() {
1643 return _satb_mark_queue_set;
1644 }
1646 // Dirty card queue support
1647 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1648 static DirtyCardQueueSet& dirty_card_queue_set() {
1649 return _dirty_card_queue_set;
1650 }
1651 #endif // INCLUDE_ALL_GCS
1653 // This method initializes the SATB and dirty card queues before a
1654 // JavaThread is added to the Java thread list. Right now, we don't
1655 // have to do anything to the dirty card queue (it should have been
1656 // activated when the thread was created), but we have to activate
1657 // the SATB queue if the thread is created while a marking cycle is
1658 // in progress. The activation / de-activation of the SATB queues at
1659 // the beginning / end of a marking cycle is done during safepoints
1660 // so we have to make sure this method is called outside one to be
1661 // able to safely read the active field of the SATB queue set. Right
1662 // now, it is called just before the thread is added to the Java
1663 // thread list in the Threads::add() method. That method is holding
1664 // the Threads_lock which ensures we are outside a safepoint. We
1665 // cannot do the obvious and set the active field of the SATB queue
1666 // when the thread is created given that, in some cases, safepoints
1667 // might happen between the JavaThread constructor being called and the
1668 // thread being added to the Java thread list (an example of this is
1669 // when the structure for the DestroyJavaVM thread is created).
1670 #if INCLUDE_ALL_GCS
1671 void initialize_queues();
1672 #else // INCLUDE_ALL_GCS
1673 void initialize_queues() { }
1674 #endif // INCLUDE_ALL_GCS
1676 // Machine dependent stuff
1677 #ifdef TARGET_OS_ARCH_linux_x86
1678 # include "thread_linux_x86.hpp"
1679 #endif
1680 #ifdef TARGET_OS_ARCH_linux_sparc
1681 # include "thread_linux_sparc.hpp"
1682 #endif
1683 #ifdef TARGET_OS_ARCH_linux_zero
1684 # include "thread_linux_zero.hpp"
1685 #endif
1686 #ifdef TARGET_OS_ARCH_solaris_x86
1687 # include "thread_solaris_x86.hpp"
1688 #endif
1689 #ifdef TARGET_OS_ARCH_solaris_sparc
1690 # include "thread_solaris_sparc.hpp"
1691 #endif
1692 #ifdef TARGET_OS_ARCH_windows_x86
1693 # include "thread_windows_x86.hpp"
1694 #endif
1695 #ifdef TARGET_OS_ARCH_linux_arm
1696 # include "thread_linux_arm.hpp"
1697 #endif
1698 #ifdef TARGET_OS_ARCH_linux_ppc
1699 # include "thread_linux_ppc.hpp"
1700 #endif
1701 #ifdef TARGET_OS_ARCH_bsd_x86
1702 # include "thread_bsd_x86.hpp"
1703 #endif
1704 #ifdef TARGET_OS_ARCH_bsd_zero
1705 # include "thread_bsd_zero.hpp"
1706 #endif
1709 public:
1710 void set_blocked_on_compilation(bool value) {
1711 _blocked_on_compilation = value;
1712 }
1714 bool blocked_on_compilation() {
1715 return _blocked_on_compilation;
1716 }
1717 protected:
1718 bool _blocked_on_compilation;
1721 // JSR166 per-thread parker
1722 private:
1723 Parker* _parker;
1724 public:
1725 Parker* parker() { return _parker; }
1727 // Biased locking support
1728 private:
1729 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1730 public:
1731 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1732 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1734 // clearing/querying jni attach status
1735 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1736 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1737 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); }
1738 private:
1739 // This field is used to determine if a thread has claimed
1740 // a par_id: it is -1 if the thread has not claimed a par_id;
1741 // otherwise its value is the par_id that has been claimed.
1742 int _claimed_par_id;
1743 public:
1744 int get_claimed_par_id() { return _claimed_par_id; }
1745 void set_claimed_par_id(int id) { _claimed_par_id = id;}
1746 };
1748 // Inline implementation of JavaThread::current
1749 inline JavaThread* JavaThread::current() {
1750 Thread* thread = ThreadLocalStorage::thread();
1751 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1752 return (JavaThread*)thread;
1753 }
1755 inline CompilerThread* JavaThread::as_CompilerThread() {
1756 assert(is_Compiler_thread(), "just checking");
1757 return (CompilerThread*)this;
1758 }
1760 inline bool JavaThread::stack_guard_zone_unused() {
1761 return _stack_guard_state == stack_guard_unused;
1762 }
1764 inline bool JavaThread::stack_yellow_zone_disabled() {
1765 return _stack_guard_state == stack_guard_yellow_disabled;
1766 }
1768 inline bool JavaThread::stack_yellow_zone_enabled() {
1769 #ifdef ASSERT
1770 if (os::uses_stack_guard_pages()) {
1771 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1772 }
1773 #endif
1774 return _stack_guard_state == stack_guard_enabled;
1775 }
1777 inline size_t JavaThread::stack_available(address cur_sp) {
1778 // This code assumes java stacks grow down
1779 address low_addr; // Limit on the address for deepest stack depth
1780 if ( _stack_guard_state == stack_guard_unused) {
1781 low_addr = stack_base() - stack_size();
1782 } else {
1783 low_addr = stack_yellow_zone_base();
1784 }
1785 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1786 }
1788 // A thread used for Compilation.
1789 class CompilerThread : public JavaThread {
1790 friend class VMStructs;
1791 private:
1792 CompilerCounters* _counters;
1794 ciEnv* _env;
1795 CompileLog* _log;
1796 CompileTask* _task;
1797 CompileQueue* _queue;
1798 BufferBlob* _buffer_blob;
1800 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1802 public:
1804 static CompilerThread* current();
1806 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1808 bool is_Compiler_thread() const { return true; }
1809 // Hide this compiler thread from external view.
1810 bool is_hidden_from_external_view() const { return true; }
1812 CompileQueue* queue() { return _queue; }
1813 CompilerCounters* counters() { return _counters; }
1815 // Get/set the thread's compilation environment.
1816 ciEnv* env() { return _env; }
1817 void set_env(ciEnv* env) { _env = env; }
1819 BufferBlob* get_buffer_blob() { return _buffer_blob; }
1820 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1822 // Get/set the thread's logging information
1823 CompileLog* log() { return _log; }
1824 void init_log(CompileLog* log) {
1825 // Set once, for good.
1826 assert(_log == NULL, "set only once");
1827 _log = log;
1828 }
1830 // GC support
1831 // Apply "f->do_oop" to all root oops in "this".
1832 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1833 void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1835 #ifndef PRODUCT
1836 private:
1837 IdealGraphPrinter *_ideal_graph_printer;
1838 public:
1839 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1840 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1841 #endif
1843 // Get/set the thread's current task
1844 CompileTask* task() { return _task; }
1845 void set_task(CompileTask* task) { _task = task; }
1847 // Track the nmethod currently being scanned by the sweeper
1848 void set_scanned_nmethod(nmethod* nm) {
1849 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1850 _scanned_nmethod = nm;
1851 }
1852 };
1854 inline CompilerThread* CompilerThread::current() {
1855 return JavaThread::current()->as_CompilerThread();
1856 }
1859 // The active thread queue. It also keeps track of the current used
1860 // thread priorities.
1861 class Threads: AllStatic {
1862 friend class VMStructs;
1863 private:
1864 static JavaThread* _thread_list;
1865 static int _number_of_threads;
1866 static int _number_of_non_daemon_threads;
1867 static int _return_code;
1868 #ifdef ASSERT
1869 static bool _vm_complete;
1870 #endif
1872 public:
1873 // Thread management
1874 // force_daemon is a concession to JNI, where we may need to add a
1875 // thread to the thread list before allocating its thread object
1876 static void add(JavaThread* p, bool force_daemon = false);
1877 static void remove(JavaThread* p);
1878 static bool includes(JavaThread* p);
1879 static JavaThread* first() { return _thread_list; }
1880 static void threads_do(ThreadClosure* tc);
1882 // Initializes the vm and creates the vm thread
1883 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1884 static void convert_vm_init_libraries_to_agents();
1885 static void create_vm_init_libraries();
1886 static void create_vm_init_agents();
1887 static void shutdown_vm_agents();
1888 static bool destroy_vm();
1889 // Supported VM versions via JNI
1890 // Includes JNI_VERSION_1_1
1891 static jboolean is_supported_jni_version_including_1_1(jint version);
1892 // Does not include JNI_VERSION_1_1
1893 static jboolean is_supported_jni_version(jint version);
1895 // Garbage collection
1896 static void follow_other_roots(void f(oop*));
1898 // Apply "f->do_oop" to all root oops in all threads.
1899 // This version may only be called by sequential code.
1900 static void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1901 // This version may be called by sequential or parallel code.
1902 static void possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1903 // This creates a list of GCTasks, one per thread.
1904 static void create_thread_roots_tasks(GCTaskQueue* q);
1905 // This creates a list of GCTasks, one per thread, for marking objects.
1906 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1908 // Apply "f->do_oop" to roots in all threads that
1909 // are part of compiled frames
1910 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1912 static void convert_hcode_pointers();
1913 static void restore_hcode_pointers();
1915 // Sweeper
1916 static void nmethods_do(CodeBlobClosure* cf);
1918 // RedefineClasses support
1919 static void metadata_do(void f(Metadata*));
1921 static void gc_epilogue();
1922 static void gc_prologue();
1923 #ifdef ASSERT
1924 static bool is_vm_complete() { return _vm_complete; }
1925 #endif
1927 // Verification
1928 static void verify();
1929 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1930 static void print(bool print_stacks, bool internal_format) {
1931 // this function is only used by debug.cpp
1932 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1933 }
1934 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1936 // Get Java threads that are waiting to enter a monitor. If doLock
1937 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1938 // VM needs to be at a safepoint.
1939 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1940 address monitor, bool doLock);
1942 // Get owning Java thread from the monitor's owner field. If doLock
1943 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1944 // VM needs to be at a safepoint.
1945 static JavaThread *owning_thread_from_monitor_owner(address owner,
1946 bool doLock);
1948 // Number of threads on the active threads list
1949 static int number_of_threads() { return _number_of_threads; }
1950 // Number of non-daemon threads on the active threads list
1951 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1953 // Deoptimizes all frames tied to marked nmethods
1954 static void deoptimized_wrt_marked_nmethods();
1956 };
1959 // Thread iterator
1960 class ThreadClosure: public StackObj {
1961 public:
1962 virtual void do_thread(Thread* thread) = 0;
1963 };
1965 class SignalHandlerMark: public StackObj {
1966 private:
1967 Thread* _thread;
1968 public:
1969 SignalHandlerMark(Thread* t) {
1970 _thread = t;
1971 if (_thread) _thread->enter_signal_handler();
1972 }
1973 ~SignalHandlerMark() {
1974 if (_thread) _thread->leave_signal_handler();
1975 _thread = NULL;
1976 }
1977 };
1980 #endif // SHARE_VM_RUNTIME_THREAD_HPP