Wed, 27 Aug 2014 08:19:12 -0400
8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill
1 /*
2 * Copyright (c) 1997, 2014, 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 #include "trace/traceBackend.hpp"
47 #include "trace/traceMacros.hpp"
48 #include "utilities/exceptions.hpp"
49 #include "utilities/top.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/g1/dirtyCardQueue.hpp"
52 #include "gc_implementation/g1/satbQueue.hpp"
53 #endif // INCLUDE_ALL_GCS
54 #ifdef ZERO
55 #ifdef TARGET_ARCH_zero
56 # include "stack_zero.hpp"
57 #endif
58 #endif
60 class ThreadSafepointState;
61 class ThreadProfiler;
63 class JvmtiThreadState;
64 class JvmtiGetLoadedClassesClosure;
65 class ThreadStatistics;
66 class ConcurrentLocksDump;
67 class ParkEvent;
68 class Parker;
70 class ciEnv;
71 class CompileThread;
72 class CompileLog;
73 class CompileTask;
74 class CompileQueue;
75 class CompilerCounters;
76 class vframeArray;
78 class DeoptResourceMark;
79 class jvmtiDeferredLocalVariableSet;
81 class GCTaskQueue;
82 class ThreadClosure;
83 class IdealGraphPrinter;
85 DEBUG_ONLY(class ResourceMark;)
87 class WorkerThread;
89 // Class hierarchy
90 // - Thread
91 // - NamedThread
92 // - VMThread
93 // - ConcurrentGCThread
94 // - WorkerThread
95 // - GangWorker
96 // - GCTaskThread
97 // - JavaThread
98 // - WatcherThread
100 class Thread: public ThreadShadow {
101 friend class VMStructs;
102 private:
103 // Exception handling
104 // (Note: _pending_exception and friends are in ThreadShadow)
105 //oop _pending_exception; // pending exception for current thread
106 // const char* _exception_file; // file information for exception (debugging only)
107 // int _exception_line; // line information for exception (debugging only)
108 protected:
109 // Support for forcing alignment of thread objects for biased locking
110 void* _real_malloc_address;
111 public:
112 void* operator new(size_t size) throw() { return allocate(size, true); }
113 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
114 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 friend class No_Alloc_Verifier;
249 friend class No_Safepoint_Verifier;
250 friend class Pause_No_Safepoint_Verifier;
251 friend class ThreadLocalStorage;
252 friend class GC_locker;
254 ThreadLocalAllocBuffer _tlab; // Thread-local eden
255 jlong _allocated_bytes; // Cumulative number of bytes allocated on
256 // the Java heap
258 TRACE_DATA _trace_data; // Thread-local data for tracing
260 int _vm_operation_started_count; // VM_Operation support
261 int _vm_operation_completed_count; // VM_Operation support
263 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
264 // is waiting to lock
265 bool _current_pending_monitor_is_from_java; // locking is from Java code
267 // ObjectMonitor on which this thread called Object.wait()
268 ObjectMonitor* _current_waiting_monitor;
270 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
271 public:
272 ObjectMonitor* omFreeList;
273 int omFreeCount; // length of omFreeList
274 int omFreeProvision; // reload chunk size
275 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
276 int omInUseCount; // length of omInUseList
278 #ifdef ASSERT
279 private:
280 bool _visited_for_critical_count;
282 public:
283 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
284 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
285 #endif
287 public:
288 enum {
289 is_definitely_current_thread = true
290 };
292 // Constructor
293 Thread();
294 virtual ~Thread();
296 // initializtion
297 void initialize_thread_local_storage();
299 // thread entry point
300 virtual void run();
302 // Testers
303 virtual bool is_VM_thread() const { return false; }
304 virtual bool is_Java_thread() const { return false; }
305 virtual bool is_Compiler_thread() const { return false; }
306 virtual bool is_hidden_from_external_view() const { return false; }
307 virtual bool is_jvmti_agent_thread() const { return false; }
308 // True iff the thread can perform GC operations at a safepoint.
309 // Generally will be true only of VM thread and parallel GC WorkGang
310 // threads.
311 virtual bool is_GC_task_thread() const { return false; }
312 virtual bool is_Watcher_thread() const { return false; }
313 virtual bool is_ConcurrentGC_thread() const { return false; }
314 virtual bool is_Named_thread() const { return false; }
315 virtual bool is_Worker_thread() const { return false; }
317 // Casts
318 virtual WorkerThread* as_Worker_thread() const { return NULL; }
320 virtual char* name() const { return (char*)"Unknown thread"; }
322 // Returns the current thread
323 static inline Thread* current();
325 // Common thread operations
326 static void set_priority(Thread* thread, ThreadPriority priority);
327 static ThreadPriority get_priority(const Thread* const thread);
328 static void start(Thread* thread);
329 static void interrupt(Thread* thr);
330 static bool is_interrupted(Thread* thr, bool clear_interrupted);
332 void set_native_thread_name(const char *name) {
333 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
334 os::set_native_thread_name(name);
335 }
337 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
338 Monitor* SR_lock() const { return _SR_lock; }
340 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
342 void set_suspend_flag(SuspendFlags f) {
343 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
344 uint32_t flags;
345 do {
346 flags = _suspend_flags;
347 }
348 while (Atomic::cmpxchg((jint)(flags | f),
349 (volatile jint*)&_suspend_flags,
350 (jint)flags) != (jint)flags);
351 }
352 void clear_suspend_flag(SuspendFlags f) {
353 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
354 uint32_t flags;
355 do {
356 flags = _suspend_flags;
357 }
358 while (Atomic::cmpxchg((jint)(flags & ~f),
359 (volatile jint*)&_suspend_flags,
360 (jint)flags) != (jint)flags);
361 }
363 void set_has_async_exception() {
364 set_suspend_flag(_has_async_exception);
365 }
366 void clear_has_async_exception() {
367 clear_suspend_flag(_has_async_exception);
368 }
370 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
372 void set_critical_native_unlock() {
373 set_suspend_flag(_critical_native_unlock);
374 }
375 void clear_critical_native_unlock() {
376 clear_suspend_flag(_critical_native_unlock);
377 }
379 // Support for Unhandled Oop detection
380 #ifdef CHECK_UNHANDLED_OOPS
381 private:
382 UnhandledOops* _unhandled_oops;
383 public:
384 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
385 // Mark oop safe for gc. It may be stack allocated but won't move.
386 void allow_unhandled_oop(oop *op) {
387 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
388 }
389 // Clear oops at safepoint so crashes point to unhandled oop violator
390 void clear_unhandled_oops() {
391 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
392 }
393 #endif // CHECK_UNHANDLED_OOPS
395 #ifndef PRODUCT
396 bool skip_gcalot() { return _skip_gcalot; }
397 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
398 #endif
400 public:
401 // Installs a pending exception to be inserted later
402 static void send_async_exception(oop thread_oop, oop java_throwable);
404 // Resource area
405 ResourceArea* resource_area() const { return _resource_area; }
406 void set_resource_area(ResourceArea* area) { _resource_area = area; }
408 OSThread* osthread() const { return _osthread; }
409 void set_osthread(OSThread* thread) { _osthread = thread; }
411 // JNI handle support
412 JNIHandleBlock* active_handles() const { return _active_handles; }
413 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
414 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
415 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
417 // Internal handle support
418 HandleArea* handle_area() const { return _handle_area; }
419 void set_handle_area(HandleArea* area) { _handle_area = area; }
421 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
422 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
424 // Thread-Local Allocation Buffer (TLAB) support
425 ThreadLocalAllocBuffer& tlab() { return _tlab; }
426 void initialize_tlab() {
427 if (UseTLAB) {
428 tlab().initialize();
429 }
430 }
432 jlong allocated_bytes() { return _allocated_bytes; }
433 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
434 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
435 inline jlong cooked_allocated_bytes();
437 TRACE_DATA* trace_data() { return &_trace_data; }
439 // VM operation support
440 int vm_operation_ticket() { return ++_vm_operation_started_count; }
441 int vm_operation_completed_count() { return _vm_operation_completed_count; }
442 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
444 // For tracking the heavyweight monitor the thread is pending on.
445 ObjectMonitor* current_pending_monitor() {
446 return _current_pending_monitor;
447 }
448 void set_current_pending_monitor(ObjectMonitor* monitor) {
449 _current_pending_monitor = monitor;
450 }
451 void set_current_pending_monitor_is_from_java(bool from_java) {
452 _current_pending_monitor_is_from_java = from_java;
453 }
454 bool current_pending_monitor_is_from_java() {
455 return _current_pending_monitor_is_from_java;
456 }
458 // For tracking the ObjectMonitor on which this thread called Object.wait()
459 ObjectMonitor* current_waiting_monitor() {
460 return _current_waiting_monitor;
461 }
462 void set_current_waiting_monitor(ObjectMonitor* monitor) {
463 _current_waiting_monitor = monitor;
464 }
466 // GC support
467 // Apply "f->do_oop" to all root oops in "this".
468 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
469 // Used by JavaThread::oops_do.
470 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
471 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
473 // Handles the parallel case for the method below.
474 private:
475 bool claim_oops_do_par_case(int collection_parity);
476 public:
477 // Requires that "collection_parity" is that of the current roots
478 // iteration. If "is_par" is false, sets the parity of "this" to
479 // "collection_parity", and returns "true". If "is_par" is true,
480 // uses an atomic instruction to set the current threads parity to
481 // "collection_parity", if it is not already. Returns "true" iff the
482 // calling thread does the update, this indicates that the calling thread
483 // has claimed the thread's stack as a root groop in the current
484 // collection.
485 bool claim_oops_do(bool is_par, int collection_parity) {
486 if (!is_par) {
487 _oops_do_parity = collection_parity;
488 return true;
489 } else {
490 return claim_oops_do_par_case(collection_parity);
491 }
492 }
494 // Sweeper support
495 void nmethods_do(CodeBlobClosure* cf);
497 // jvmtiRedefineClasses support
498 void metadata_do(void f(Metadata*));
500 // Used by fast lock support
501 virtual bool is_lock_owned(address adr) const;
503 // Check if address is in the stack of the thread (not just for locks).
504 // Warning: the method can only be used on the running thread
505 bool is_in_stack(address adr) const;
506 // Check if address is in the usable part of the stack (excludes protected
507 // guard pages)
508 bool is_in_usable_stack(address adr) const;
510 // Sets this thread as starting thread. Returns failure if thread
511 // creation fails due to lack of memory, too many threads etc.
512 bool set_as_starting_thread();
514 protected:
515 // OS data associated with the thread
516 OSThread* _osthread; // Platform-specific thread information
518 // Thread local resource area for temporary allocation within the VM
519 ResourceArea* _resource_area;
521 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
523 // Thread local handle area for allocation of handles within the VM
524 HandleArea* _handle_area;
525 GrowableArray<Metadata*>* _metadata_handles;
527 // Support for stack overflow handling, get_thread, etc.
528 address _stack_base;
529 size_t _stack_size;
530 uintptr_t _self_raw_id; // used by get_thread (mutable)
531 int _lgrp_id;
533 public:
534 // Stack overflow support
535 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
537 void set_stack_base(address base) { _stack_base = base; }
538 size_t stack_size() const { return _stack_size; }
539 void set_stack_size(size_t size) { _stack_size = size; }
540 void record_stack_base_and_size();
542 bool on_local_stack(address adr) const {
543 /* QQQ this has knowledge of direction, ought to be a stack method */
544 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
545 }
547 uintptr_t self_raw_id() { return _self_raw_id; }
548 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
550 int lgrp_id() const { return _lgrp_id; }
551 void set_lgrp_id(int value) { _lgrp_id = value; }
553 // Printing
554 void print_on(outputStream* st) const;
555 void print() const { print_on(tty); }
556 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
558 // Debug-only code
559 #ifdef ASSERT
560 private:
561 // Deadlock detection support for Mutex locks. List of locks own by thread.
562 Monitor* _owned_locks;
563 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
564 // thus the friendship
565 friend class Mutex;
566 friend class Monitor;
568 public:
569 void print_owned_locks_on(outputStream* st) const;
570 void print_owned_locks() const { print_owned_locks_on(tty); }
571 Monitor* owned_locks() const { return _owned_locks; }
572 bool owns_locks() const { return owned_locks() != NULL; }
573 bool owns_locks_but_compiled_lock() const;
575 // Deadlock detection
576 bool allow_allocation() { return _allow_allocation_count == 0; }
577 ResourceMark* current_resource_mark() { return _current_resource_mark; }
578 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
579 #endif
581 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
583 private:
584 volatile int _jvmti_env_iteration_count;
586 public:
587 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
588 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
589 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
591 // Code generation
592 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
593 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
594 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
596 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
597 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
599 #define TLAB_FIELD_OFFSET(name) \
600 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
602 TLAB_FIELD_OFFSET(start)
603 TLAB_FIELD_OFFSET(end)
604 TLAB_FIELD_OFFSET(top)
605 TLAB_FIELD_OFFSET(pf_top)
606 TLAB_FIELD_OFFSET(size) // desired_size
607 TLAB_FIELD_OFFSET(refill_waste_limit)
608 TLAB_FIELD_OFFSET(number_of_refills)
609 TLAB_FIELD_OFFSET(fast_refill_waste)
610 TLAB_FIELD_OFFSET(slow_allocations)
612 #undef TLAB_FIELD_OFFSET
614 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
616 public:
617 volatile intptr_t _Stalled ;
618 volatile int _TypeTag ;
619 ParkEvent * _ParkEvent ; // for synchronized()
620 ParkEvent * _SleepEvent ; // for Thread.sleep
621 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
622 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
623 int NativeSyncRecursion ; // diagnostic
625 volatile int _OnTrap ; // Resume-at IP delta
626 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
627 jint _hashStateX ; // thread-specific hashCode generator state
628 jint _hashStateY ;
629 jint _hashStateZ ;
630 void * _schedctl ;
633 volatile jint rng [4] ; // RNG for spin loop
635 // Low-level leaf-lock primitives used to implement synchronization
636 // and native monitor-mutex infrastructure.
637 // Not for general synchronization use.
638 static void SpinAcquire (volatile int * Lock, const char * Name) ;
639 static void SpinRelease (volatile int * Lock) ;
640 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
641 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
642 static void muxRelease (volatile intptr_t * Lock) ;
643 };
645 // Inline implementation of Thread::current()
646 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
647 // startup.
648 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
649 // period. This is inlined in thread_<os_family>.inline.hpp.
651 inline Thread* Thread::current() {
652 #ifdef ASSERT
653 // This function is very high traffic. Define PARANOID to enable expensive
654 // asserts.
655 #ifdef PARANOID
656 // Signal handler should call ThreadLocalStorage::get_thread_slow()
657 Thread* t = ThreadLocalStorage::get_thread_slow();
658 assert(t != NULL && !t->is_inside_signal_handler(),
659 "Don't use Thread::current() inside signal handler");
660 #endif
661 #endif
662 Thread* thread = ThreadLocalStorage::thread();
663 assert(thread != NULL, "just checking");
664 return thread;
665 }
667 // Name support for threads. non-JavaThread subclasses with multiple
668 // uniquely named instances should derive from this.
669 class NamedThread: public Thread {
670 friend class VMStructs;
671 enum {
672 max_name_len = 64
673 };
674 private:
675 char* _name;
676 // log JavaThread being processed by oops_do
677 JavaThread* _processed_thread;
679 public:
680 NamedThread();
681 ~NamedThread();
682 // May only be called once per thread.
683 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
684 virtual bool is_Named_thread() const { return true; }
685 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
686 JavaThread *processed_thread() { return _processed_thread; }
687 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
688 };
690 // Worker threads are named and have an id of an assigned work.
691 class WorkerThread: public NamedThread {
692 private:
693 uint _id;
694 public:
695 WorkerThread() : _id(0) { }
696 virtual bool is_Worker_thread() const { return true; }
698 virtual WorkerThread* as_Worker_thread() const {
699 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
700 return (WorkerThread*) this;
701 }
703 void set_id(uint work_id) { _id = work_id; }
704 uint id() const { return _id; }
705 };
707 // A single WatcherThread is used for simulating timer interrupts.
708 class WatcherThread: public Thread {
709 friend class VMStructs;
710 public:
711 virtual void run();
713 private:
714 static WatcherThread* _watcher_thread;
716 static bool _startable;
717 volatile static bool _should_terminate; // updated without holding lock
719 os::WatcherThreadCrashProtection* _crash_protection;
720 public:
721 enum SomeConstants {
722 delay_interval = 10 // interrupt delay in milliseconds
723 };
725 // Constructor
726 WatcherThread();
728 // Tester
729 bool is_Watcher_thread() const { return true; }
731 // Printing
732 char* name() const { return (char*)"VM Periodic Task Thread"; }
733 void print_on(outputStream* st) const;
734 void print() const { print_on(tty); }
735 void unpark();
737 // Returns the single instance of WatcherThread
738 static WatcherThread* watcher_thread() { return _watcher_thread; }
740 // Create and start the single instance of WatcherThread, or stop it on shutdown
741 static void start();
742 static void stop();
743 // Only allow start once the VM is sufficiently initialized
744 // Otherwise the first task to enroll will trigger the start
745 static void make_startable();
747 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
748 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
749 _crash_protection = crash_protection;
750 }
752 bool has_crash_protection() const { return _crash_protection != NULL; }
753 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
755 private:
756 int sleep() const;
757 };
760 class CompilerThread;
762 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
764 class JavaThread: public Thread {
765 friend class VMStructs;
766 private:
767 JavaThread* _next; // The next thread in the Threads list
768 oop _threadObj; // The Java level thread object
770 #ifdef ASSERT
771 private:
772 int _java_call_counter;
774 public:
775 int java_call_counter() { return _java_call_counter; }
776 void inc_java_call_counter() { _java_call_counter++; }
777 void dec_java_call_counter() {
778 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
779 _java_call_counter--;
780 }
781 private: // restore original namespace restriction
782 #endif // ifdef ASSERT
784 #ifndef PRODUCT
785 public:
786 enum {
787 jump_ring_buffer_size = 16
788 };
789 private: // restore original namespace restriction
790 #endif
792 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
794 ThreadFunction _entry_point;
796 JNIEnv _jni_environment;
798 // Deopt support
799 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
801 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
802 // transition out of native
803 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
804 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
805 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
806 // Because deoptimization is lazy we must save jvmti requests to set locals
807 // in compiled frames until we deoptimize and we have an interpreter frame.
808 // This holds the pointer to array (yeah like there might be more than one) of
809 // description of compiled vframes that have locals that need to be updated.
810 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
812 // Handshake value for fixing 6243940. We need a place for the i2c
813 // adapter to store the callee Method*. This value is NEVER live
814 // across a gc point so it does NOT have to be gc'd
815 // The handshake is open ended since we can't be certain that it will
816 // be NULLed. This is because we rarely ever see the race and end up
817 // in handle_wrong_method which is the backend of the handshake. See
818 // code in i2c adapters and handle_wrong_method.
820 Method* _callee_target;
822 // Used to pass back results to the interpreter or generated code running Java code.
823 oop _vm_result; // oop result is GC-preserved
824 Metadata* _vm_result_2; // non-oop result
826 // See ReduceInitialCardMarks: this holds the precise space interval of
827 // the most recent slow path allocation for which compiled code has
828 // elided card-marks for performance along the fast-path.
829 MemRegion _deferred_card_mark;
831 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
832 // allocated during deoptimization
833 // and by JNI_MonitorEnter/Exit
835 // Async. requests support
836 enum AsyncRequests {
837 _no_async_condition = 0,
838 _async_exception,
839 _async_unsafe_access_error
840 };
841 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
842 oop _pending_async_exception;
844 // Safepoint support
845 public: // Expose _thread_state for SafeFetchInt()
846 volatile JavaThreadState _thread_state;
847 private:
848 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
849 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
851 // JavaThread termination support
852 enum TerminatedTypes {
853 _not_terminated = 0xDEAD - 2,
854 _thread_exiting, // JavaThread::exit() has been called for this thread
855 _thread_terminated, // JavaThread is removed from thread list
856 _vm_exited // JavaThread is still executing native code, but VM is terminated
857 // only VM_Exit can set _vm_exited
858 };
860 // In general a JavaThread's _terminated field transitions as follows:
861 //
862 // _not_terminated => _thread_exiting => _thread_terminated
863 //
864 // _vm_exited is a special value to cover the case of a JavaThread
865 // executing native code after the VM itself is terminated.
866 volatile TerminatedTypes _terminated;
867 // suspend/resume support
868 volatile bool _suspend_equivalent; // Suspend equivalent condition
869 jint _in_deopt_handler; // count of deoptimization
870 // handlers thread is in
871 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
872 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
873 // never locked) when throwing an exception. Used by interpreter only.
875 // JNI attach states:
876 enum JNIAttachStates {
877 _not_attaching_via_jni = 1, // thread is not attaching via JNI
878 _attaching_via_jni, // thread is attaching via JNI
879 _attached_via_jni // thread has attached via JNI
880 };
882 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
883 // A native thread that is attaching via JNI starts with a value
884 // of _attaching_via_jni and transitions to _attached_via_jni.
885 volatile JNIAttachStates _jni_attach_state;
887 public:
888 // State of the stack guard pages for this thread.
889 enum StackGuardState {
890 stack_guard_unused, // not needed
891 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
892 stack_guard_enabled // enabled
893 };
895 private:
897 StackGuardState _stack_guard_state;
899 // Precompute the limit of the stack as used in stack overflow checks.
900 // We load it from here to simplify the stack overflow check in assembly.
901 address _stack_overflow_limit;
903 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
904 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
905 // code)
906 volatile oop _exception_oop; // Exception thrown in compiled code
907 volatile address _exception_pc; // PC where exception happened
908 volatile address _exception_handler_pc; // PC for handler of exception
909 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
911 // support for JNI critical regions
912 jint _jni_active_critical; // count of entries into JNI critical region
914 // For deadlock detection.
915 int _depth_first_number;
917 // JVMTI PopFrame support
918 // This is set to popframe_pending to signal that top Java frame should be popped immediately
919 int _popframe_condition;
921 #ifndef PRODUCT
922 int _jmp_ring_index;
923 struct {
924 // We use intptr_t instead of address so debugger doesn't try and display strings
925 intptr_t _target;
926 intptr_t _instruction;
927 const char* _file;
928 int _line;
929 } _jmp_ring[ jump_ring_buffer_size ];
930 #endif /* PRODUCT */
932 #if INCLUDE_ALL_GCS
933 // Support for G1 barriers
935 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
936 // Set of all such queues.
937 static SATBMarkQueueSet _satb_mark_queue_set;
939 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
940 // Set of all such queues.
941 static DirtyCardQueueSet _dirty_card_queue_set;
943 void flush_barrier_queues();
944 #endif // INCLUDE_ALL_GCS
946 friend class VMThread;
947 friend class ThreadWaitTransition;
948 friend class VM_Exit;
950 void initialize(); // Initialized the instance variables
952 public:
953 // Constructor
954 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
955 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
956 ~JavaThread();
958 #ifdef ASSERT
959 // verify this JavaThread hasn't be published in the Threads::list yet
960 void verify_not_published();
961 #endif
963 //JNI functiontable getter/setter for JVMTI jni function table interception API.
964 void set_jni_functions(struct JNINativeInterface_* functionTable) {
965 _jni_environment.functions = functionTable;
966 }
967 struct JNINativeInterface_* get_jni_functions() {
968 return (struct JNINativeInterface_ *)_jni_environment.functions;
969 }
971 // This function is called at thread creation to allow
972 // platform specific thread variables to be initialized.
973 void cache_global_variables();
975 // Executes Shutdown.shutdown()
976 void invoke_shutdown_hooks();
978 // Cleanup on thread exit
979 enum ExitType {
980 normal_exit,
981 jni_detach
982 };
983 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
985 void cleanup_failed_attach_current_thread();
987 // Testers
988 virtual bool is_Java_thread() const { return true; }
990 // Thread chain operations
991 JavaThread* next() const { return _next; }
992 void set_next(JavaThread* p) { _next = p; }
994 // Thread oop. threadObj() can be NULL for initial JavaThread
995 // (or for threads attached via JNI)
996 oop threadObj() const { return _threadObj; }
997 void set_threadObj(oop p) { _threadObj = p; }
999 ThreadPriority java_priority() const; // Read from threadObj()
1001 // Prepare thread and add to priority queue. If a priority is
1002 // not specified, use the priority of the thread object. Threads_lock
1003 // must be held while this function is called.
1004 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1006 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1007 address saved_exception_pc() { return _saved_exception_pc; }
1010 ThreadFunction entry_point() const { return _entry_point; }
1012 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1013 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1015 // Last frame anchor routines
1017 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1019 // last_Java_sp
1020 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1021 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1023 // last_Java_pc
1025 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1027 // Safepoint support
1028 #ifndef PPC64
1029 JavaThreadState thread_state() const { return _thread_state; }
1030 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1031 #else
1032 // Use membars when accessing volatile _thread_state. See
1033 // Threads::create_vm() for size checks.
1034 inline JavaThreadState thread_state() const;
1035 inline void set_thread_state(JavaThreadState s);
1036 #endif
1037 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1038 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1039 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1041 // thread has called JavaThread::exit() or is terminated
1042 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1043 // thread is terminated (no longer on the threads list); we compare
1044 // against the two non-terminated values so that a freed JavaThread
1045 // will also be considered terminated.
1046 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1047 void set_terminated(TerminatedTypes t) { _terminated = t; }
1048 // special for Threads::remove() which is static:
1049 void set_terminated_value() { _terminated = _thread_terminated; }
1050 void block_if_vm_exited();
1052 bool doing_unsafe_access() { return _doing_unsafe_access; }
1053 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1055 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1056 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1058 // Suspend/resume support for JavaThread
1059 private:
1060 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1061 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1063 public:
1064 void java_suspend();
1065 void java_resume();
1066 int java_suspend_self();
1068 void check_and_wait_while_suspended() {
1069 assert(JavaThread::current() == this, "sanity check");
1071 bool do_self_suspend;
1072 do {
1073 // were we externally suspended while we were waiting?
1074 do_self_suspend = handle_special_suspend_equivalent_condition();
1075 if (do_self_suspend) {
1076 // don't surprise the thread that suspended us by returning
1077 java_suspend_self();
1078 set_suspend_equivalent();
1079 }
1080 } while (do_self_suspend);
1081 }
1082 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1083 // Check for async exception in addition to safepoint and suspend request.
1084 static void check_special_condition_for_native_trans(JavaThread *thread);
1086 // Same as check_special_condition_for_native_trans but finishes the
1087 // transition into thread_in_Java mode so that it can potentially
1088 // block.
1089 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1091 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1092 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1093 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1094 // Warning: is_ext_suspend_completed() may temporarily drop the
1095 // SR_lock to allow the thread to reach a stable thread state if
1096 // it is currently in a transient thread state.
1097 return is_ext_suspend_completed(false /*!called_by_wait */,
1098 SuspendRetryDelay, bits);
1099 }
1101 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1102 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1103 // passed as the count and delay parameters. Experiments with specific
1104 // calls to wait_for_ext_suspend_completion() can be done by passing
1105 // other values in the code. Experiments with all calls can be done
1106 // via the appropriate -XX options.
1107 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1109 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1110 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1112 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1113 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1114 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1116 bool is_external_suspend() const {
1117 return (_suspend_flags & _external_suspend) != 0;
1118 }
1119 // Whenever a thread transitions from native to vm/java it must suspend
1120 // if external|deopt suspend is present.
1121 bool is_suspend_after_native() const {
1122 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1123 }
1125 // external suspend request is completed
1126 bool is_ext_suspended() const {
1127 return (_suspend_flags & _ext_suspended) != 0;
1128 }
1130 bool is_external_suspend_with_lock() const {
1131 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1132 return is_external_suspend();
1133 }
1135 // Special method to handle a pending external suspend request
1136 // when a suspend equivalent condition lifts.
1137 bool handle_special_suspend_equivalent_condition() {
1138 assert(is_suspend_equivalent(),
1139 "should only be called in a suspend equivalence condition");
1140 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1141 bool ret = is_external_suspend();
1142 if (!ret) {
1143 // not about to self-suspend so clear suspend equivalence
1144 clear_suspend_equivalent();
1145 }
1146 // implied else:
1147 // We have a pending external suspend request so we leave the
1148 // suspend_equivalent flag set until java_suspend_self() sets
1149 // the ext_suspended flag and clears the suspend_equivalent
1150 // flag. This insures that wait_for_ext_suspend_completion()
1151 // will return consistent values.
1152 return ret;
1153 }
1155 // utility methods to see if we are doing some kind of suspension
1156 bool is_being_ext_suspended() const {
1157 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1158 return is_ext_suspended() || is_external_suspend();
1159 }
1161 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1163 void set_suspend_equivalent() { _suspend_equivalent = true; };
1164 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1166 // Thread.stop support
1167 void send_thread_stop(oop throwable);
1168 AsyncRequests clear_special_runtime_exit_condition() {
1169 AsyncRequests x = _special_runtime_exit_condition;
1170 _special_runtime_exit_condition = _no_async_condition;
1171 return x;
1172 }
1174 // Are any async conditions present?
1175 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1177 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1179 // these next two are also used for self-suspension and async exception support
1180 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1182 // Return true if JavaThread has an asynchronous condition or
1183 // if external suspension is requested.
1184 bool has_special_runtime_exit_condition() {
1185 // We call is_external_suspend() last since external suspend should
1186 // be less common. Because we don't use is_external_suspend_with_lock
1187 // it is possible that we won't see an asynchronous external suspend
1188 // request that has just gotten started, i.e., SR_lock grabbed but
1189 // _external_suspend field change either not made yet or not visible
1190 // yet. However, this is okay because the request is asynchronous and
1191 // we will see the new flag value the next time through. It's also
1192 // possible that the external suspend request is dropped after
1193 // we have checked is_external_suspend(), we will recheck its value
1194 // under SR_lock in java_suspend_self().
1195 return (_special_runtime_exit_condition != _no_async_condition) ||
1196 is_external_suspend() || is_deopt_suspend();
1197 }
1199 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1201 void set_pending_async_exception(oop e) {
1202 _pending_async_exception = e;
1203 _special_runtime_exit_condition = _async_exception;
1204 set_has_async_exception();
1205 }
1207 // Fast-locking support
1208 bool is_lock_owned(address adr) const;
1210 // Accessors for vframe array top
1211 // The linked list of vframe arrays are sorted on sp. This means when we
1212 // unpack the head must contain the vframe array to unpack.
1213 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1214 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1216 // Side structure for defering update of java frame locals until deopt occurs
1217 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1218 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1220 // These only really exist to make debugging deopt problems simpler
1222 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1223 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1225 // The special resourceMark used during deoptimization
1227 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1228 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1230 intptr_t* must_deopt_id() { return _must_deopt_id; }
1231 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1232 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1234 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1235 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1237 Method* callee_target() const { return _callee_target; }
1238 void set_callee_target (Method* x) { _callee_target = x; }
1240 // Oop results of vm runtime calls
1241 oop vm_result() const { return _vm_result; }
1242 void set_vm_result (oop x) { _vm_result = x; }
1244 Metadata* vm_result_2() const { return _vm_result_2; }
1245 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1247 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1248 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1250 // Exception handling for compiled methods
1251 oop exception_oop() const { return _exception_oop; }
1252 address exception_pc() const { return _exception_pc; }
1253 address exception_handler_pc() const { return _exception_handler_pc; }
1254 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1256 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1257 void set_exception_pc(address a) { _exception_pc = a; }
1258 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1259 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1261 void clear_exception_oop_and_pc() {
1262 set_exception_oop(NULL);
1263 set_exception_pc(NULL);
1264 }
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 address stack_overflow_limit() { return _stack_overflow_limit; }
1305 void set_stack_overflow_limit() {
1306 _stack_overflow_limit = _stack_base - _stack_size +
1307 ((StackShadowPages +
1308 StackYellowPages +
1309 StackRedPages) * os::vm_page_size());
1310 }
1312 // Misc. accessors/mutators
1313 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1314 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1315 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1317 #ifndef PRODUCT
1318 void record_jump(address target, address instr, const char* file, int line);
1319 #endif /* PRODUCT */
1321 // For assembly stub generation
1322 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1323 #ifndef PRODUCT
1324 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1325 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1326 #endif /* PRODUCT */
1327 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1328 static ByteSize last_Java_sp_offset() {
1329 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1330 }
1331 static ByteSize last_Java_pc_offset() {
1332 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1333 }
1334 static ByteSize frame_anchor_offset() {
1335 return byte_offset_of(JavaThread, _anchor);
1336 }
1337 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1338 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1339 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1340 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1341 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1342 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1343 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1344 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1345 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1346 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1347 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1348 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1349 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1351 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1352 static ByteSize should_post_on_exceptions_flag_offset() {
1353 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1354 }
1356 #if INCLUDE_ALL_GCS
1357 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1358 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1359 #endif // INCLUDE_ALL_GCS
1361 // Returns the jni environment for this thread
1362 JNIEnv* jni_environment() { return &_jni_environment; }
1364 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1365 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1366 // Only return NULL if thread is off the thread list; starting to
1367 // exit should not return NULL.
1368 if (thread_from_jni_env->is_terminated()) {
1369 thread_from_jni_env->block_if_vm_exited();
1370 return NULL;
1371 } else {
1372 return thread_from_jni_env;
1373 }
1374 }
1376 // JNI critical regions. These can nest.
1377 bool in_critical() { return _jni_active_critical > 0; }
1378 bool in_last_critical() { return _jni_active_critical == 1; }
1379 void enter_critical() { assert(Thread::current() == this ||
1380 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1381 "this must be current thread or synchronizing");
1382 _jni_active_critical++; }
1383 void exit_critical() { assert(Thread::current() == this,
1384 "this must be current thread");
1385 _jni_active_critical--;
1386 assert(_jni_active_critical >= 0,
1387 "JNI critical nesting problem?"); }
1389 // For deadlock detection
1390 int depth_first_number() { return _depth_first_number; }
1391 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1393 private:
1394 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1396 public:
1397 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1398 void add_monitor_chunk(MonitorChunk* chunk);
1399 void remove_monitor_chunk(MonitorChunk* chunk);
1400 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1401 void inc_in_deopt_handler() { _in_deopt_handler++; }
1402 void dec_in_deopt_handler() {
1403 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1404 if (_in_deopt_handler > 0) { // robustness
1405 _in_deopt_handler--;
1406 }
1407 }
1409 private:
1410 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1412 public:
1414 // Frame iteration; calls the function f for all frames on the stack
1415 void frames_do(void f(frame*, const RegisterMap*));
1417 // Memory operations
1418 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1420 // Sweeper operations
1421 void nmethods_do(CodeBlobClosure* cf);
1423 // RedefineClasses Support
1424 void metadata_do(void f(Metadata*));
1426 // Memory management operations
1427 void gc_epilogue();
1428 void gc_prologue();
1430 // Misc. operations
1431 char* name() const { return (char*)get_thread_name(); }
1432 void print_on(outputStream* st) const;
1433 void print() const { print_on(tty); }
1434 void print_value();
1435 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1436 void print_thread_state() const PRODUCT_RETURN;
1437 void print_on_error(outputStream* st, char* buf, int buflen) const;
1438 void verify();
1439 const char* get_thread_name() const;
1440 private:
1441 // factor out low-level mechanics for use in both normal and error cases
1442 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1443 public:
1444 const char* get_threadgroup_name() const;
1445 const char* get_parent_name() const;
1447 // Accessing frames
1448 frame last_frame() {
1449 _anchor.make_walkable(this);
1450 return pd_last_frame();
1451 }
1452 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1454 // Returns method at 'depth' java or native frames down the stack
1455 // Used for security checks
1456 Klass* security_get_caller_class(int depth);
1458 // Print stack trace in external format
1459 void print_stack_on(outputStream* st);
1460 void print_stack() { print_stack_on(tty); }
1462 // Print stack traces in various internal formats
1463 void trace_stack() PRODUCT_RETURN;
1464 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1465 void trace_frames() PRODUCT_RETURN;
1466 void trace_oops() PRODUCT_RETURN;
1468 // Print an annotated view of the stack frames
1469 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1470 void validate_frame_layout() {
1471 print_frame_layout(0, true);
1472 }
1474 // Returns the number of stack frames on the stack
1475 int depth() const;
1477 // Function for testing deoptimization
1478 void deoptimize();
1479 void make_zombies();
1481 void deoptimized_wrt_marked_nmethods();
1483 // Profiling operation (see fprofile.cpp)
1484 public:
1485 bool profile_last_Java_frame(frame* fr);
1487 private:
1488 ThreadProfiler* _thread_profiler;
1489 private:
1490 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1491 friend class FlatProfilerTask; // uses get_thread_profiler.
1492 friend class ThreadProfilerMark; // uses get_thread_profiler.
1493 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1494 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1495 ThreadProfiler* result = _thread_profiler;
1496 _thread_profiler = tp;
1497 return result;
1498 }
1500 public:
1501 // Returns the running thread as a JavaThread
1502 static inline JavaThread* current();
1504 // Returns the active Java thread. Do not use this if you know you are calling
1505 // from a JavaThread, as it's slower than JavaThread::current. If called from
1506 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1507 // operation. You may not want that either.
1508 static JavaThread* active();
1510 inline CompilerThread* as_CompilerThread();
1512 public:
1513 virtual void run();
1514 void thread_main_inner();
1516 private:
1517 // PRIVILEGED STACK
1518 PrivilegedElement* _privileged_stack_top;
1519 GrowableArray<oop>* _array_for_gc;
1520 public:
1522 // Returns the privileged_stack information.
1523 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1524 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1525 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1527 public:
1528 // Thread local information maintained by JVMTI.
1529 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1530 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1531 // getter is used to get this JavaThread's JvmtiThreadState if it has
1532 // one which means NULL can be returned. JvmtiThreadState::state_for()
1533 // is used to get the specified JavaThread's JvmtiThreadState if it has
1534 // one or it allocates a new JvmtiThreadState for the JavaThread and
1535 // returns it. JvmtiThreadState::state_for() will return NULL only if
1536 // the specified JavaThread is exiting.
1537 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1538 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1539 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1540 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1542 // JVMTI PopFrame support
1543 // Setting and clearing popframe_condition
1544 // All of these enumerated values are bits. popframe_pending
1545 // indicates that a PopFrame() has been requested and not yet been
1546 // completed. popframe_processing indicates that that PopFrame() is in
1547 // the process of being completed. popframe_force_deopt_reexecution_bit
1548 // indicates that special handling is required when returning to a
1549 // deoptimized caller.
1550 enum PopCondition {
1551 popframe_inactive = 0x00,
1552 popframe_pending_bit = 0x01,
1553 popframe_processing_bit = 0x02,
1554 popframe_force_deopt_reexecution_bit = 0x04
1555 };
1556 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1557 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1558 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1559 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1560 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1561 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1562 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1563 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1564 #ifdef CC_INTERP
1565 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1566 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1567 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1568 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1569 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1570 #endif
1572 private:
1573 // Saved incoming arguments to popped frame.
1574 // Used only when popped interpreted frame returns to deoptimized frame.
1575 void* _popframe_preserved_args;
1576 int _popframe_preserved_args_size;
1578 public:
1579 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1580 void* popframe_preserved_args();
1581 ByteSize popframe_preserved_args_size();
1582 WordSize popframe_preserved_args_size_in_words();
1583 void popframe_free_preserved_args();
1586 private:
1587 JvmtiThreadState *_jvmti_thread_state;
1588 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1590 // Used by the interpreter in fullspeed mode for frame pop, method
1591 // entry, method exit and single stepping support. This field is
1592 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1593 // It can be set to zero asynchronously (i.e., without a VM operation
1594 // or a lock) so we have to be very careful.
1595 int _interp_only_mode;
1597 public:
1598 // used by the interpreter for fullspeed debugging support (see above)
1599 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1600 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1601 int get_interp_only_mode() { return _interp_only_mode; }
1602 void increment_interp_only_mode() { ++_interp_only_mode; }
1603 void decrement_interp_only_mode() { --_interp_only_mode; }
1605 // support for cached flag that indicates whether exceptions need to be posted for this thread
1606 // if this is false, we can avoid deoptimizing when events are thrown
1607 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1608 private:
1609 int _should_post_on_exceptions_flag;
1611 public:
1612 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1613 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1615 private:
1616 ThreadStatistics *_thread_stat;
1618 public:
1619 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1621 // Return a blocker object for which this thread is blocked parking.
1622 oop current_park_blocker();
1624 private:
1625 static size_t _stack_size_at_create;
1627 public:
1628 static inline size_t stack_size_at_create(void) {
1629 return _stack_size_at_create;
1630 }
1631 static inline void set_stack_size_at_create(size_t value) {
1632 _stack_size_at_create = value;
1633 }
1635 #if INCLUDE_ALL_GCS
1636 // SATB marking queue support
1637 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1638 static SATBMarkQueueSet& satb_mark_queue_set() {
1639 return _satb_mark_queue_set;
1640 }
1642 // Dirty card queue support
1643 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1644 static DirtyCardQueueSet& dirty_card_queue_set() {
1645 return _dirty_card_queue_set;
1646 }
1647 #endif // INCLUDE_ALL_GCS
1649 // This method initializes the SATB and dirty card queues before a
1650 // JavaThread is added to the Java thread list. Right now, we don't
1651 // have to do anything to the dirty card queue (it should have been
1652 // activated when the thread was created), but we have to activate
1653 // the SATB queue if the thread is created while a marking cycle is
1654 // in progress. The activation / de-activation of the SATB queues at
1655 // the beginning / end of a marking cycle is done during safepoints
1656 // so we have to make sure this method is called outside one to be
1657 // able to safely read the active field of the SATB queue set. Right
1658 // now, it is called just before the thread is added to the Java
1659 // thread list in the Threads::add() method. That method is holding
1660 // the Threads_lock which ensures we are outside a safepoint. We
1661 // cannot do the obvious and set the active field of the SATB queue
1662 // when the thread is created given that, in some cases, safepoints
1663 // might happen between the JavaThread constructor being called and the
1664 // thread being added to the Java thread list (an example of this is
1665 // when the structure for the DestroyJavaVM thread is created).
1666 #if INCLUDE_ALL_GCS
1667 void initialize_queues();
1668 #else // INCLUDE_ALL_GCS
1669 void initialize_queues() { }
1670 #endif // INCLUDE_ALL_GCS
1672 // Machine dependent stuff
1673 #ifdef TARGET_OS_ARCH_linux_x86
1674 # include "thread_linux_x86.hpp"
1675 #endif
1676 #ifdef TARGET_OS_ARCH_linux_sparc
1677 # include "thread_linux_sparc.hpp"
1678 #endif
1679 #ifdef TARGET_OS_ARCH_linux_zero
1680 # include "thread_linux_zero.hpp"
1681 #endif
1682 #ifdef TARGET_OS_ARCH_solaris_x86
1683 # include "thread_solaris_x86.hpp"
1684 #endif
1685 #ifdef TARGET_OS_ARCH_solaris_sparc
1686 # include "thread_solaris_sparc.hpp"
1687 #endif
1688 #ifdef TARGET_OS_ARCH_windows_x86
1689 # include "thread_windows_x86.hpp"
1690 #endif
1691 #ifdef TARGET_OS_ARCH_linux_arm
1692 # include "thread_linux_arm.hpp"
1693 #endif
1694 #ifdef TARGET_OS_ARCH_linux_ppc
1695 # include "thread_linux_ppc.hpp"
1696 #endif
1697 #ifdef TARGET_OS_ARCH_aix_ppc
1698 # include "thread_aix_ppc.hpp"
1699 #endif
1700 #ifdef TARGET_OS_ARCH_bsd_x86
1701 # include "thread_bsd_x86.hpp"
1702 #endif
1703 #ifdef TARGET_OS_ARCH_bsd_zero
1704 # include "thread_bsd_zero.hpp"
1705 #endif
1708 public:
1709 void set_blocked_on_compilation(bool value) {
1710 _blocked_on_compilation = value;
1711 }
1713 bool blocked_on_compilation() {
1714 return _blocked_on_compilation;
1715 }
1716 protected:
1717 bool _blocked_on_compilation;
1720 // JSR166 per-thread parker
1721 private:
1722 Parker* _parker;
1723 public:
1724 Parker* parker() { return _parker; }
1726 // Biased locking support
1727 private:
1728 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1729 public:
1730 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1731 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1733 // clearing/querying jni attach status
1734 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1735 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1736 inline void set_done_attaching_via_jni();
1737 private:
1738 // This field is used to determine if a thread has claimed
1739 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1740 // otherwise its value is the par_id that has been claimed.
1741 uint _claimed_par_id;
1742 public:
1743 uint get_claimed_par_id() { return _claimed_par_id; }
1744 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1745 };
1747 // Inline implementation of JavaThread::current
1748 inline JavaThread* JavaThread::current() {
1749 Thread* thread = ThreadLocalStorage::thread();
1750 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1751 return (JavaThread*)thread;
1752 }
1754 inline CompilerThread* JavaThread::as_CompilerThread() {
1755 assert(is_Compiler_thread(), "just checking");
1756 return (CompilerThread*)this;
1757 }
1759 inline bool JavaThread::stack_guard_zone_unused() {
1760 return _stack_guard_state == stack_guard_unused;
1761 }
1763 inline bool JavaThread::stack_yellow_zone_disabled() {
1764 return _stack_guard_state == stack_guard_yellow_disabled;
1765 }
1767 inline bool JavaThread::stack_yellow_zone_enabled() {
1768 #ifdef ASSERT
1769 if (os::uses_stack_guard_pages()) {
1770 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1771 }
1772 #endif
1773 return _stack_guard_state == stack_guard_enabled;
1774 }
1776 inline size_t JavaThread::stack_available(address cur_sp) {
1777 // This code assumes java stacks grow down
1778 address low_addr; // Limit on the address for deepest stack depth
1779 if ( _stack_guard_state == stack_guard_unused) {
1780 low_addr = stack_base() - stack_size();
1781 } else {
1782 low_addr = stack_yellow_zone_base();
1783 }
1784 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1785 }
1787 // A thread used for Compilation.
1788 class CompilerThread : public JavaThread {
1789 friend class VMStructs;
1790 private:
1791 CompilerCounters* _counters;
1793 ciEnv* _env;
1794 CompileLog* _log;
1795 CompileTask* _task;
1796 CompileQueue* _queue;
1797 BufferBlob* _buffer_blob;
1799 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1800 AbstractCompiler* _compiler;
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 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1813 AbstractCompiler* compiler() const { return _compiler; }
1815 CompileQueue* queue() const { return _queue; }
1816 CompilerCounters* counters() const { return _counters; }
1818 // Get/set the thread's compilation environment.
1819 ciEnv* env() { return _env; }
1820 void set_env(ciEnv* env) { _env = env; }
1822 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1823 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1825 // Get/set the thread's logging information
1826 CompileLog* log() { return _log; }
1827 void init_log(CompileLog* log) {
1828 // Set once, for good.
1829 assert(_log == NULL, "set only once");
1830 _log = log;
1831 }
1833 // GC support
1834 // Apply "f->do_oop" to all root oops in "this".
1835 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1836 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1838 #ifndef PRODUCT
1839 private:
1840 IdealGraphPrinter *_ideal_graph_printer;
1841 public:
1842 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1843 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1844 #endif
1846 // Get/set the thread's current task
1847 CompileTask* task() { return _task; }
1848 void set_task(CompileTask* task) { _task = task; }
1850 // Track the nmethod currently being scanned by the sweeper
1851 void set_scanned_nmethod(nmethod* nm) {
1852 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1853 _scanned_nmethod = nm;
1854 }
1855 };
1857 inline CompilerThread* CompilerThread::current() {
1858 return JavaThread::current()->as_CompilerThread();
1859 }
1862 // The active thread queue. It also keeps track of the current used
1863 // thread priorities.
1864 class Threads: AllStatic {
1865 friend class VMStructs;
1866 private:
1867 static JavaThread* _thread_list;
1868 static int _number_of_threads;
1869 static int _number_of_non_daemon_threads;
1870 static int _return_code;
1871 #ifdef ASSERT
1872 static bool _vm_complete;
1873 #endif
1875 public:
1876 // Thread management
1877 // force_daemon is a concession to JNI, where we may need to add a
1878 // thread to the thread list before allocating its thread object
1879 static void add(JavaThread* p, bool force_daemon = false);
1880 static void remove(JavaThread* p);
1881 static bool includes(JavaThread* p);
1882 static JavaThread* first() { return _thread_list; }
1883 static void threads_do(ThreadClosure* tc);
1885 // Initializes the vm and creates the vm thread
1886 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1887 static void convert_vm_init_libraries_to_agents();
1888 static void create_vm_init_libraries();
1889 static void create_vm_init_agents();
1890 static void shutdown_vm_agents();
1891 static bool destroy_vm();
1892 // Supported VM versions via JNI
1893 // Includes JNI_VERSION_1_1
1894 static jboolean is_supported_jni_version_including_1_1(jint version);
1895 // Does not include JNI_VERSION_1_1
1896 static jboolean is_supported_jni_version(jint version);
1898 // Garbage collection
1899 static void follow_other_roots(void f(oop*));
1901 // Apply "f->do_oop" to all root oops in all threads.
1902 // This version may only be called by sequential code.
1903 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1904 // This version may be called by sequential or parallel code.
1905 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1906 // This creates a list of GCTasks, one per thread.
1907 static void create_thread_roots_tasks(GCTaskQueue* q);
1908 // This creates a list of GCTasks, one per thread, for marking objects.
1909 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1911 // Apply "f->do_oop" to roots in all threads that
1912 // are part of compiled frames
1913 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1915 static void convert_hcode_pointers();
1916 static void restore_hcode_pointers();
1918 // Sweeper
1919 static void nmethods_do(CodeBlobClosure* cf);
1921 // RedefineClasses support
1922 static void metadata_do(void f(Metadata*));
1924 static void gc_epilogue();
1925 static void gc_prologue();
1926 #ifdef ASSERT
1927 static bool is_vm_complete() { return _vm_complete; }
1928 #endif
1930 // Verification
1931 static void verify();
1932 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1933 static void print(bool print_stacks, bool internal_format) {
1934 // this function is only used by debug.cpp
1935 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1936 }
1937 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1939 // Get Java threads that are waiting to enter a monitor. If doLock
1940 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1941 // VM needs to be at a safepoint.
1942 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1943 address monitor, bool doLock);
1945 // Get owning Java thread from the monitor's owner field. If doLock
1946 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1947 // VM needs to be at a safepoint.
1948 static JavaThread *owning_thread_from_monitor_owner(address owner,
1949 bool doLock);
1951 // Number of threads on the active threads list
1952 static int number_of_threads() { return _number_of_threads; }
1953 // Number of non-daemon threads on the active threads list
1954 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1956 // Deoptimizes all frames tied to marked nmethods
1957 static void deoptimized_wrt_marked_nmethods();
1959 };
1962 // Thread iterator
1963 class ThreadClosure: public StackObj {
1964 public:
1965 virtual void do_thread(Thread* thread) = 0;
1966 };
1968 class SignalHandlerMark: public StackObj {
1969 private:
1970 Thread* _thread;
1971 public:
1972 SignalHandlerMark(Thread* t) {
1973 _thread = t;
1974 if (_thread) _thread->enter_signal_handler();
1975 }
1976 ~SignalHandlerMark() {
1977 if (_thread) _thread->leave_signal_handler();
1978 _thread = NULL;
1979 }
1980 };
1983 #endif // SHARE_VM_RUNTIME_THREAD_HPP