Thu, 26 Jul 2018 16:04:06 +0800
Merge
1 /*
2 * Copyright (c) 1997, 2015, 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 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
32 #define SHARE_VM_RUNTIME_THREAD_HPP
34 #include "memory/allocation.hpp"
35 #include "memory/threadLocalAllocBuffer.hpp"
36 #include "oops/oop.hpp"
37 #include "prims/jni.h"
38 #include "prims/jvmtiExport.hpp"
39 #include "runtime/frame.hpp"
40 #include "runtime/javaFrameAnchor.hpp"
41 #include "runtime/jniHandles.hpp"
42 #include "runtime/mutexLocker.hpp"
43 #include "runtime/os.hpp"
44 #include "runtime/osThread.hpp"
45 #include "runtime/park.hpp"
46 #include "runtime/safepoint.hpp"
47 #include "runtime/stubRoutines.hpp"
48 #include "runtime/threadLocalStorage.hpp"
49 #include "runtime/thread_ext.hpp"
50 #include "runtime/unhandledOops.hpp"
51 #include "trace/traceBackend.hpp"
52 #include "trace/traceMacros.hpp"
53 #include "utilities/exceptions.hpp"
54 #include "utilities/macros.hpp"
55 #include "utilities/top.hpp"
56 #if INCLUDE_ALL_GCS
57 #include "gc_implementation/g1/dirtyCardQueue.hpp"
58 #include "gc_implementation/g1/satbQueue.hpp"
59 #endif // INCLUDE_ALL_GCS
60 #ifdef TARGET_ARCH_zero
61 # include "stack_zero.hpp"
62 #endif
64 class ThreadSafepointState;
65 class ThreadProfiler;
67 class JvmtiThreadState;
68 class JvmtiGetLoadedClassesClosure;
69 class ThreadStatistics;
70 class ConcurrentLocksDump;
71 class ParkEvent;
72 class Parker;
74 class ciEnv;
75 class CompileThread;
76 class CompileLog;
77 class CompileTask;
78 class CompileQueue;
79 class CompilerCounters;
80 class vframeArray;
82 class DeoptResourceMark;
83 class jvmtiDeferredLocalVariableSet;
85 class GCTaskQueue;
86 class ThreadClosure;
87 class IdealGraphPrinter;
89 class Metadata;
90 template <class T, MEMFLAGS F> class ChunkedList;
91 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
93 DEBUG_ONLY(class ResourceMark;)
95 class WorkerThread;
97 // Class hierarchy
98 // - Thread
99 // - NamedThread
100 // - VMThread
101 // - ConcurrentGCThread
102 // - WorkerThread
103 // - GangWorker
104 // - GCTaskThread
105 // - JavaThread
106 // - WatcherThread
108 class Thread: public ThreadShadow {
109 friend class VMStructs;
110 private:
111 // Exception handling
112 // (Note: _pending_exception and friends are in ThreadShadow)
113 //oop _pending_exception; // pending exception for current thread
114 // const char* _exception_file; // file information for exception (debugging only)
115 // int _exception_line; // line information for exception (debugging only)
116 protected:
117 // Support for forcing alignment of thread objects for biased locking
118 void* _real_malloc_address;
119 public:
120 void* operator new(size_t size) throw() { return allocate(size, true); }
121 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
122 return allocate(size, false); }
123 void operator delete(void* p);
125 protected:
126 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
127 private:
129 // ***************************************************************
130 // Suspend and resume support
131 // ***************************************************************
132 //
133 // VM suspend/resume no longer exists - it was once used for various
134 // things including safepoints but was deprecated and finally removed
135 // in Java 7. Because VM suspension was considered "internal" Java-level
136 // suspension was considered "external", and this legacy naming scheme
137 // remains.
138 //
139 // External suspend/resume requests come from JVM_SuspendThread,
140 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
141 // ResumeThread. External
142 // suspend requests cause _external_suspend to be set and external
143 // resume requests cause _external_suspend to be cleared.
144 // External suspend requests do not nest on top of other external
145 // suspend requests. The higher level APIs reject suspend requests
146 // for already suspended threads.
147 //
148 // The external_suspend
149 // flag is checked by has_special_runtime_exit_condition() and java thread
150 // will self-suspend when handle_special_runtime_exit_condition() is
151 // called. Most uses of the _thread_blocked state in JavaThreads are
152 // considered the same as being externally suspended; if the blocking
153 // condition lifts, the JavaThread will self-suspend. Other places
154 // where VM checks for external_suspend include:
155 // + mutex granting (do not enter monitors when thread is suspended)
156 // + state transitions from _thread_in_native
157 //
158 // In general, java_suspend() does not wait for an external suspend
159 // request to complete. When it returns, the only guarantee is that
160 // the _external_suspend field is true.
161 //
162 // wait_for_ext_suspend_completion() is used to wait for an external
163 // suspend request to complete. External suspend requests are usually
164 // followed by some other interface call that requires the thread to
165 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
166 // the interface that requires quiescence, we give the JavaThread a
167 // chance to self-suspend before we need it to be quiescent. This
168 // improves overall suspend/query performance.
169 //
170 // _suspend_flags controls the behavior of java_ suspend/resume.
171 // It must be set under the protection of SR_lock. Read from the flag is
172 // OK without SR_lock as long as the value is only used as a hint.
173 // (e.g., check _external_suspend first without lock and then recheck
174 // inside SR_lock and finish the suspension)
175 //
176 // _suspend_flags is also overloaded for other "special conditions" so
177 // that a single check indicates whether any special action is needed
178 // eg. for async exceptions.
179 // -------------------------------------------------------------------
180 // Notes:
181 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
182 // but we still update its value to keep other part of the system (mainly
183 // JVMTI) happy. ThreadState is legacy code (see notes in
184 // osThread.hpp).
185 //
186 // 2. It would be more natural if set_external_suspend() is private and
187 // part of java_suspend(), but that probably would affect the suspend/query
188 // performance. Need more investigation on this.
189 //
191 // suspend/resume lock: used for self-suspend
192 Monitor* _SR_lock;
194 protected:
195 enum SuspendFlags {
196 // NOTE: avoid using the sign-bit as cc generates different test code
197 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
199 _external_suspend = 0x20000000U, // thread is asked to self suspend
200 _ext_suspended = 0x40000000U, // thread has self-suspended
201 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
203 _has_async_exception = 0x00000001U, // there is a pending async exception
204 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
205 };
207 // various suspension related flags - atomically updated
208 // overloaded for async exception checking in check_special_condition_for_native_trans.
209 volatile uint32_t _suspend_flags;
211 private:
212 int _num_nested_signal;
214 public:
215 void enter_signal_handler() { _num_nested_signal++; }
216 void leave_signal_handler() { _num_nested_signal--; }
217 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
219 private:
220 // Debug tracing
221 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
223 // Active_handles points to a block of handles
224 JNIHandleBlock* _active_handles;
226 // One-element thread local free list
227 JNIHandleBlock* _free_handle_block;
229 // Point to the last handle mark
230 HandleMark* _last_handle_mark;
232 // The parity of the last strong_roots iteration in which this thread was
233 // claimed as a task.
234 jint _oops_do_parity;
236 public:
237 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
238 HandleMark* last_handle_mark() const { return _last_handle_mark; }
239 private:
241 // debug support for checking if code does allow safepoints or not
242 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
243 // mutex, or blocking on an object synchronizer (Java locking).
244 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
245 // If !allow_allocation(), then an assertion failure will happen during allocation
246 // (Hence, !allow_safepoint() => !allow_allocation()).
247 //
248 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
249 //
250 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
251 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
253 // Used by SkipGCALot class.
254 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
256 friend class No_Alloc_Verifier;
257 friend class No_Safepoint_Verifier;
258 friend class Pause_No_Safepoint_Verifier;
259 friend class ThreadLocalStorage;
260 friend class GC_locker;
262 ThreadLocalAllocBuffer _tlab; // Thread-local eden
263 jlong _allocated_bytes; // Cumulative number of bytes allocated on
264 // the Java heap
266 // Thread-local buffer used by MetadataOnStackMark.
267 MetadataOnStackBuffer* _metadata_on_stack_buffer;
269 TRACE_DATA _trace_data; // Thread-local data for tracing
271 ThreadExt _ext;
273 int _vm_operation_started_count; // VM_Operation support
274 int _vm_operation_completed_count; // VM_Operation support
276 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
277 // is waiting to lock
278 bool _current_pending_monitor_is_from_java; // locking is from Java code
280 // ObjectMonitor on which this thread called Object.wait()
281 ObjectMonitor* _current_waiting_monitor;
283 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
284 public:
285 ObjectMonitor* omFreeList;
286 int omFreeCount; // length of omFreeList
287 int omFreeProvision; // reload chunk size
288 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
289 int omInUseCount; // length of omInUseList
291 #ifdef ASSERT
292 private:
293 bool _visited_for_critical_count;
295 public:
296 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
297 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
298 #endif
300 public:
301 enum {
302 is_definitely_current_thread = true
303 };
305 // Constructor
306 Thread();
307 virtual ~Thread();
309 // initializtion
310 void initialize_thread_local_storage();
312 // thread entry point
313 virtual void run();
315 // Testers
316 virtual bool is_VM_thread() const { return false; }
317 virtual bool is_Java_thread() const { return false; }
318 virtual bool is_Compiler_thread() const { return false; }
319 virtual bool is_hidden_from_external_view() const { return false; }
320 virtual bool is_jvmti_agent_thread() const { return false; }
321 // True iff the thread can perform GC operations at a safepoint.
322 // Generally will be true only of VM thread and parallel GC WorkGang
323 // threads.
324 virtual bool is_GC_task_thread() const { return false; }
325 virtual bool is_Watcher_thread() const { return false; }
326 virtual bool is_ConcurrentGC_thread() const { return false; }
327 virtual bool is_Named_thread() const { return false; }
328 virtual bool is_Worker_thread() const { return false; }
330 // Casts
331 virtual WorkerThread* as_Worker_thread() const { return NULL; }
333 virtual char* name() const { return (char*)"Unknown thread"; }
335 // Returns the current thread
336 static inline Thread* current();
338 // Common thread operations
339 static void set_priority(Thread* thread, ThreadPriority priority);
340 static ThreadPriority get_priority(const Thread* const thread);
341 static void start(Thread* thread);
342 static void interrupt(Thread* thr);
343 static bool is_interrupted(Thread* thr, bool clear_interrupted);
345 void set_native_thread_name(const char *name) {
346 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
347 os::set_native_thread_name(name);
348 }
350 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
351 Monitor* SR_lock() const { return _SR_lock; }
353 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
355 void set_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 }
365 void clear_suspend_flag(SuspendFlags f) {
366 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
367 uint32_t flags;
368 do {
369 flags = _suspend_flags;
370 }
371 while (Atomic::cmpxchg((jint)(flags & ~f),
372 (volatile jint*)&_suspend_flags,
373 (jint)flags) != (jint)flags);
374 }
376 void set_has_async_exception() {
377 set_suspend_flag(_has_async_exception);
378 }
379 void clear_has_async_exception() {
380 clear_suspend_flag(_has_async_exception);
381 }
383 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
385 void set_critical_native_unlock() {
386 set_suspend_flag(_critical_native_unlock);
387 }
388 void clear_critical_native_unlock() {
389 clear_suspend_flag(_critical_native_unlock);
390 }
392 // Support for Unhandled Oop detection
393 #ifdef CHECK_UNHANDLED_OOPS
394 private:
395 UnhandledOops* _unhandled_oops;
396 public:
397 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
398 // Mark oop safe for gc. It may be stack allocated but won't move.
399 void allow_unhandled_oop(oop *op) {
400 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
401 }
402 // Clear oops at safepoint so crashes point to unhandled oop violator
403 void clear_unhandled_oops() {
404 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
405 }
406 #endif // CHECK_UNHANDLED_OOPS
408 #ifndef PRODUCT
409 bool skip_gcalot() { return _skip_gcalot; }
410 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
411 #endif
413 public:
414 // Installs a pending exception to be inserted later
415 static void send_async_exception(oop thread_oop, oop java_throwable);
417 // Resource area
418 ResourceArea* resource_area() const { return _resource_area; }
419 void set_resource_area(ResourceArea* area) { _resource_area = area; }
421 OSThread* osthread() const { return _osthread; }
422 void set_osthread(OSThread* thread) { _osthread = thread; }
424 // JNI handle support
425 JNIHandleBlock* active_handles() const { return _active_handles; }
426 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
427 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
428 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
430 // Internal handle support
431 HandleArea* handle_area() const { return _handle_area; }
432 void set_handle_area(HandleArea* area) { _handle_area = area; }
434 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
435 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
437 // Thread-Local Allocation Buffer (TLAB) support
438 ThreadLocalAllocBuffer& tlab() { return _tlab; }
439 void initialize_tlab() {
440 if (UseTLAB) {
441 tlab().initialize();
442 }
443 }
445 jlong allocated_bytes() { return _allocated_bytes; }
446 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
447 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
448 inline jlong cooked_allocated_bytes();
450 TRACE_DATA* trace_data() { return &_trace_data; }
452 const ThreadExt& ext() const { return _ext; }
453 ThreadExt& ext() { return _ext; }
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, CLDClosure* 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 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;
522 // Check if address is in the usable part of the stack (excludes protected
523 // guard pages)
524 bool is_in_usable_stack(address adr) const;
526 // Sets this thread as starting thread. Returns failure if thread
527 // creation fails due to lack of memory, too many threads etc.
528 bool set_as_starting_thread();
530 void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; }
531 MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; }
533 protected:
534 // OS data associated with the thread
535 OSThread* _osthread; // Platform-specific thread information
537 // Thread local resource area for temporary allocation within the VM
538 ResourceArea* _resource_area;
540 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
542 // Thread local handle area for allocation of handles within the VM
543 HandleArea* _handle_area;
544 GrowableArray<Metadata*>* _metadata_handles;
546 // Support for stack overflow handling, get_thread, etc.
547 address _stack_base;
548 size_t _stack_size;
549 uintptr_t _self_raw_id; // used by get_thread (mutable)
550 int _lgrp_id;
552 public:
553 // Stack overflow support
554 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
556 void set_stack_base(address base) { _stack_base = base; }
557 size_t stack_size() const { return _stack_size; }
558 void set_stack_size(size_t size) { _stack_size = size; }
559 void record_stack_base_and_size();
561 bool on_local_stack(address adr) const {
562 /* QQQ this has knowledge of direction, ought to be a stack method */
563 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
564 }
566 uintptr_t self_raw_id() { return _self_raw_id; }
567 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
569 int lgrp_id() const { return _lgrp_id; }
570 void set_lgrp_id(int value) { _lgrp_id = value; }
572 // Printing
573 void print_on(outputStream* st) const;
574 void print() const { print_on(tty); }
575 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
577 // Debug-only code
578 #ifdef ASSERT
579 private:
580 // Deadlock detection support for Mutex locks. List of locks own by thread.
581 Monitor* _owned_locks;
582 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
583 // thus the friendship
584 friend class Mutex;
585 friend class Monitor;
587 public:
588 void print_owned_locks_on(outputStream* st) const;
589 void print_owned_locks() const { print_owned_locks_on(tty); }
590 Monitor* owned_locks() const { return _owned_locks; }
591 bool owns_locks() const { return owned_locks() != NULL; }
592 bool owns_locks_but_compiled_lock() const;
594 // Deadlock detection
595 bool allow_allocation() { return _allow_allocation_count == 0; }
596 ResourceMark* current_resource_mark() { return _current_resource_mark; }
597 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
598 #endif
600 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
602 private:
603 volatile int _jvmti_env_iteration_count;
605 public:
606 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
607 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
608 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
610 // Code generation
611 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
612 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
613 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
615 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
616 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
618 #define TLAB_FIELD_OFFSET(name) \
619 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
621 TLAB_FIELD_OFFSET(start)
622 TLAB_FIELD_OFFSET(end)
623 TLAB_FIELD_OFFSET(top)
624 TLAB_FIELD_OFFSET(pf_top)
625 TLAB_FIELD_OFFSET(size) // desired_size
626 TLAB_FIELD_OFFSET(refill_waste_limit)
627 TLAB_FIELD_OFFSET(number_of_refills)
628 TLAB_FIELD_OFFSET(fast_refill_waste)
629 TLAB_FIELD_OFFSET(slow_allocations)
631 #undef TLAB_FIELD_OFFSET
633 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
635 public:
636 volatile intptr_t _Stalled ;
637 volatile int _TypeTag ;
638 ParkEvent * _ParkEvent ; // for synchronized()
639 ParkEvent * _SleepEvent ; // for Thread.sleep
640 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
641 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
642 int NativeSyncRecursion ; // diagnostic
644 volatile int _OnTrap ; // Resume-at IP delta
645 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
646 jint _hashStateX ; // thread-specific hashCode generator state
647 jint _hashStateY ;
648 jint _hashStateZ ;
649 void * _schedctl ;
652 volatile jint rng [4] ; // RNG for spin loop
654 // Low-level leaf-lock primitives used to implement synchronization
655 // and native monitor-mutex infrastructure.
656 // Not for general synchronization use.
657 static void SpinAcquire (volatile int * Lock, const char * Name) ;
658 static void SpinRelease (volatile int * Lock) ;
659 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
660 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
661 static void muxRelease (volatile intptr_t * Lock) ;
662 };
664 // Inline implementation of Thread::current()
665 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
666 // startup.
667 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
668 // period. This is inlined in thread_<os_family>.inline.hpp.
670 inline Thread* Thread::current() {
671 #ifdef ASSERT
672 // This function is very high traffic. Define PARANOID to enable expensive
673 // asserts.
674 #ifdef PARANOID
675 // Signal handler should call ThreadLocalStorage::get_thread_slow()
676 Thread* t = ThreadLocalStorage::get_thread_slow();
677 assert(t != NULL && !t->is_inside_signal_handler(),
678 "Don't use Thread::current() inside signal handler");
679 #endif
680 #endif
681 Thread* thread = ThreadLocalStorage::thread();
682 assert(thread != NULL, "just checking");
683 return thread;
684 }
686 // Name support for threads. non-JavaThread subclasses with multiple
687 // uniquely named instances should derive from this.
688 class NamedThread: public Thread {
689 friend class VMStructs;
690 enum {
691 max_name_len = 64
692 };
693 private:
694 char* _name;
695 // log JavaThread being processed by oops_do
696 JavaThread* _processed_thread;
698 public:
699 NamedThread();
700 ~NamedThread();
701 // May only be called once per thread.
702 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
703 virtual bool is_Named_thread() const { return true; }
704 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
705 JavaThread *processed_thread() { return _processed_thread; }
706 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
707 };
709 // Worker threads are named and have an id of an assigned work.
710 class WorkerThread: public NamedThread {
711 private:
712 uint _id;
713 public:
714 WorkerThread() : _id(0) { }
715 virtual bool is_Worker_thread() const { return true; }
717 virtual WorkerThread* as_Worker_thread() const {
718 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
719 return (WorkerThread*) this;
720 }
722 void set_id(uint work_id) { _id = work_id; }
723 uint id() const { return _id; }
724 };
726 // A single WatcherThread is used for simulating timer interrupts.
727 class WatcherThread: public Thread {
728 friend class VMStructs;
729 public:
730 virtual void run();
732 private:
733 static WatcherThread* _watcher_thread;
735 static bool _startable;
736 volatile static bool _should_terminate; // updated without holding lock
738 os::WatcherThreadCrashProtection* _crash_protection;
739 public:
740 enum SomeConstants {
741 delay_interval = 10 // interrupt delay in milliseconds
742 };
744 // Constructor
745 WatcherThread();
747 // Tester
748 bool is_Watcher_thread() const { return true; }
750 // Printing
751 char* name() const { return (char*)"VM Periodic Task Thread"; }
752 void print_on(outputStream* st) const;
753 void print() const { print_on(tty); }
754 void unpark();
756 // Returns the single instance of WatcherThread
757 static WatcherThread* watcher_thread() { return _watcher_thread; }
759 // Create and start the single instance of WatcherThread, or stop it on shutdown
760 static void start();
761 static void stop();
762 // Only allow start once the VM is sufficiently initialized
763 // Otherwise the first task to enroll will trigger the start
764 static void make_startable();
766 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
767 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
768 _crash_protection = crash_protection;
769 }
771 bool has_crash_protection() const { return _crash_protection != NULL; }
772 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
774 private:
775 int sleep() const;
776 };
779 class CompilerThread;
781 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
783 class JavaThread: public Thread {
784 friend class VMStructs;
785 private:
786 JavaThread* _next; // The next thread in the Threads list
787 oop _threadObj; // The Java level thread object
789 #ifdef ASSERT
790 private:
791 int _java_call_counter;
793 public:
794 int java_call_counter() { return _java_call_counter; }
795 void inc_java_call_counter() { _java_call_counter++; }
796 void dec_java_call_counter() {
797 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
798 _java_call_counter--;
799 }
800 private: // restore original namespace restriction
801 #endif // ifdef ASSERT
803 #ifndef PRODUCT
804 public:
805 enum {
806 jump_ring_buffer_size = 16
807 };
808 private: // restore original namespace restriction
809 #endif
811 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
813 ThreadFunction _entry_point;
815 JNIEnv _jni_environment;
817 // Deopt support
818 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
820 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
821 // transition out of native
822 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
823 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
824 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
825 // Because deoptimization is lazy we must save jvmti requests to set locals
826 // in compiled frames until we deoptimize and we have an interpreter frame.
827 // This holds the pointer to array (yeah like there might be more than one) of
828 // description of compiled vframes that have locals that need to be updated.
829 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
831 // Handshake value for fixing 6243940. We need a place for the i2c
832 // adapter to store the callee Method*. This value is NEVER live
833 // across a gc point so it does NOT have to be gc'd
834 // The handshake is open ended since we can't be certain that it will
835 // be NULLed. This is because we rarely ever see the race and end up
836 // in handle_wrong_method which is the backend of the handshake. See
837 // code in i2c adapters and handle_wrong_method.
839 Method* _callee_target;
841 // Used to pass back results to the interpreter or generated code running Java code.
842 oop _vm_result; // oop result is GC-preserved
843 Metadata* _vm_result_2; // non-oop result
845 // See ReduceInitialCardMarks: this holds the precise space interval of
846 // the most recent slow path allocation for which compiled code has
847 // elided card-marks for performance along the fast-path.
848 MemRegion _deferred_card_mark;
850 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
851 // allocated during deoptimization
852 // and by JNI_MonitorEnter/Exit
854 // Async. requests support
855 enum AsyncRequests {
856 _no_async_condition = 0,
857 _async_exception,
858 _async_unsafe_access_error
859 };
860 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
861 oop _pending_async_exception;
863 // Safepoint support
864 public: // Expose _thread_state for SafeFetchInt()
865 volatile JavaThreadState _thread_state;
866 private:
867 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
868 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
870 // JavaThread termination support
871 enum TerminatedTypes {
872 _not_terminated = 0xDEAD - 2,
873 _thread_exiting, // JavaThread::exit() has been called for this thread
874 _thread_terminated, // JavaThread is removed from thread list
875 _vm_exited // JavaThread is still executing native code, but VM is terminated
876 // only VM_Exit can set _vm_exited
877 };
879 // In general a JavaThread's _terminated field transitions as follows:
880 //
881 // _not_terminated => _thread_exiting => _thread_terminated
882 //
883 // _vm_exited is a special value to cover the case of a JavaThread
884 // executing native code after the VM itself is terminated.
885 volatile TerminatedTypes _terminated;
886 // suspend/resume support
887 volatile bool _suspend_equivalent; // Suspend equivalent condition
888 jint _in_deopt_handler; // count of deoptimization
889 // handlers thread is in
890 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
891 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
892 // never locked) when throwing an exception. Used by interpreter only.
894 // JNI attach states:
895 enum JNIAttachStates {
896 _not_attaching_via_jni = 1, // thread is not attaching via JNI
897 _attaching_via_jni, // thread is attaching via JNI
898 _attached_via_jni // thread has attached via JNI
899 };
901 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
902 // A native thread that is attaching via JNI starts with a value
903 // of _attaching_via_jni and transitions to _attached_via_jni.
904 volatile JNIAttachStates _jni_attach_state;
906 public:
907 // State of the stack guard pages for this thread.
908 enum StackGuardState {
909 stack_guard_unused, // not needed
910 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
911 stack_guard_enabled // enabled
912 };
914 private:
916 StackGuardState _stack_guard_state;
918 // Precompute the limit of the stack as used in stack overflow checks.
919 // We load it from here to simplify the stack overflow check in assembly.
920 address _stack_overflow_limit;
922 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
923 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
924 // code)
925 volatile oop _exception_oop; // Exception thrown in compiled code
926 volatile address _exception_pc; // PC where exception happened
927 volatile address _exception_handler_pc; // PC for handler of exception
928 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
930 // support for JNI critical regions
931 jint _jni_active_critical; // count of entries into JNI critical region
933 // Checked JNI: function name requires exception check
934 char* _pending_jni_exception_check_fn;
936 // For deadlock detection.
937 int _depth_first_number;
939 // JVMTI PopFrame support
940 // This is set to popframe_pending to signal that top Java frame should be popped immediately
941 int _popframe_condition;
943 // If reallocation of scalar replaced objects fails, we throw OOM
944 // and during exception propagation, pop the top
945 // _frames_to_pop_failed_realloc frames, the ones that reference
946 // failed reallocations.
947 int _frames_to_pop_failed_realloc;
949 #ifndef PRODUCT
950 int _jmp_ring_index;
951 struct {
952 // We use intptr_t instead of address so debugger doesn't try and display strings
953 intptr_t _target;
954 intptr_t _instruction;
955 const char* _file;
956 int _line;
957 } _jmp_ring[ jump_ring_buffer_size ];
958 #endif /* PRODUCT */
960 #if INCLUDE_ALL_GCS
961 // Support for G1 barriers
963 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
964 // Set of all such queues.
965 static SATBMarkQueueSet _satb_mark_queue_set;
967 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
968 // Set of all such queues.
969 static DirtyCardQueueSet _dirty_card_queue_set;
971 void flush_barrier_queues();
972 #endif // INCLUDE_ALL_GCS
974 friend class VMThread;
975 friend class ThreadWaitTransition;
976 friend class VM_Exit;
978 void initialize(); // Initialized the instance variables
980 public:
981 // Constructor
982 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
983 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
984 ~JavaThread();
986 #ifdef ASSERT
987 // verify this JavaThread hasn't be published in the Threads::list yet
988 void verify_not_published();
989 #endif
991 //JNI functiontable getter/setter for JVMTI jni function table interception API.
992 void set_jni_functions(struct JNINativeInterface_* functionTable) {
993 _jni_environment.functions = functionTable;
994 }
995 struct JNINativeInterface_* get_jni_functions() {
996 return (struct JNINativeInterface_ *)_jni_environment.functions;
997 }
999 // This function is called at thread creation to allow
1000 // platform specific thread variables to be initialized.
1001 void cache_global_variables();
1003 // Executes Shutdown.shutdown()
1004 void invoke_shutdown_hooks();
1006 // Cleanup on thread exit
1007 enum ExitType {
1008 normal_exit,
1009 jni_detach
1010 };
1011 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1013 void cleanup_failed_attach_current_thread();
1015 // Testers
1016 virtual bool is_Java_thread() const { return true; }
1018 // Thread chain operations
1019 JavaThread* next() const { return _next; }
1020 void set_next(JavaThread* p) { _next = p; }
1022 // Thread oop. threadObj() can be NULL for initial JavaThread
1023 // (or for threads attached via JNI)
1024 oop threadObj() const { return _threadObj; }
1025 void set_threadObj(oop p) { _threadObj = p; }
1027 ThreadPriority java_priority() const; // Read from threadObj()
1029 // Prepare thread and add to priority queue. If a priority is
1030 // not specified, use the priority of the thread object. Threads_lock
1031 // must be held while this function is called.
1032 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1033 void prepare_ext();
1035 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1036 address saved_exception_pc() { return _saved_exception_pc; }
1039 ThreadFunction entry_point() const { return _entry_point; }
1041 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1042 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1044 // Last frame anchor routines
1046 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1048 // last_Java_sp
1049 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1050 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1052 // last_Java_pc
1054 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1056 // Safepoint support
1057 #ifndef PPC64
1058 JavaThreadState thread_state() const { return _thread_state; }
1059 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1060 #else
1061 // Use membars when accessing volatile _thread_state. See
1062 // Threads::create_vm() for size checks.
1063 inline JavaThreadState thread_state() const;
1064 inline void set_thread_state(JavaThreadState s);
1065 #endif
1066 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1067 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1068 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1070 // thread has called JavaThread::exit() or is terminated
1071 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1072 // thread is terminated (no longer on the threads list); we compare
1073 // against the two non-terminated values so that a freed JavaThread
1074 // will also be considered terminated.
1075 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1076 void set_terminated(TerminatedTypes t) { _terminated = t; }
1077 // special for Threads::remove() which is static:
1078 void set_terminated_value() { _terminated = _thread_terminated; }
1079 void block_if_vm_exited();
1081 bool doing_unsafe_access() { return _doing_unsafe_access; }
1082 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1084 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1085 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1087 // Suspend/resume support for JavaThread
1088 private:
1089 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1090 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1092 public:
1093 void java_suspend();
1094 void java_resume();
1095 int java_suspend_self();
1097 void check_and_wait_while_suspended() {
1098 assert(JavaThread::current() == this, "sanity check");
1100 bool do_self_suspend;
1101 do {
1102 // were we externally suspended while we were waiting?
1103 do_self_suspend = handle_special_suspend_equivalent_condition();
1104 if (do_self_suspend) {
1105 // don't surprise the thread that suspended us by returning
1106 java_suspend_self();
1107 set_suspend_equivalent();
1108 }
1109 } while (do_self_suspend);
1110 }
1111 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1112 // Check for async exception in addition to safepoint and suspend request.
1113 static void check_special_condition_for_native_trans(JavaThread *thread);
1115 // Same as check_special_condition_for_native_trans but finishes the
1116 // transition into thread_in_Java mode so that it can potentially
1117 // block.
1118 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1120 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1121 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1122 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1123 // Warning: is_ext_suspend_completed() may temporarily drop the
1124 // SR_lock to allow the thread to reach a stable thread state if
1125 // it is currently in a transient thread state.
1126 return is_ext_suspend_completed(false /*!called_by_wait */,
1127 SuspendRetryDelay, bits);
1128 }
1130 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1131 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1132 // passed as the count and delay parameters. Experiments with specific
1133 // calls to wait_for_ext_suspend_completion() can be done by passing
1134 // other values in the code. Experiments with all calls can be done
1135 // via the appropriate -XX options.
1136 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1138 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1139 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1141 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1142 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1143 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1145 bool is_external_suspend() const {
1146 return (_suspend_flags & _external_suspend) != 0;
1147 }
1148 // Whenever a thread transitions from native to vm/java it must suspend
1149 // if external|deopt suspend is present.
1150 bool is_suspend_after_native() const {
1151 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1152 }
1154 // external suspend request is completed
1155 bool is_ext_suspended() const {
1156 return (_suspend_flags & _ext_suspended) != 0;
1157 }
1159 bool is_external_suspend_with_lock() const {
1160 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1161 return is_external_suspend();
1162 }
1164 // Special method to handle a pending external suspend request
1165 // when a suspend equivalent condition lifts.
1166 bool handle_special_suspend_equivalent_condition() {
1167 assert(is_suspend_equivalent(),
1168 "should only be called in a suspend equivalence condition");
1169 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1170 bool ret = is_external_suspend();
1171 if (!ret) {
1172 // not about to self-suspend so clear suspend equivalence
1173 clear_suspend_equivalent();
1174 }
1175 // implied else:
1176 // We have a pending external suspend request so we leave the
1177 // suspend_equivalent flag set until java_suspend_self() sets
1178 // the ext_suspended flag and clears the suspend_equivalent
1179 // flag. This insures that wait_for_ext_suspend_completion()
1180 // will return consistent values.
1181 return ret;
1182 }
1184 // utility methods to see if we are doing some kind of suspension
1185 bool is_being_ext_suspended() const {
1186 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1187 return is_ext_suspended() || is_external_suspend();
1188 }
1190 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1192 void set_suspend_equivalent() { _suspend_equivalent = true; };
1193 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1195 // Thread.stop support
1196 void send_thread_stop(oop throwable);
1197 AsyncRequests clear_special_runtime_exit_condition() {
1198 AsyncRequests x = _special_runtime_exit_condition;
1199 _special_runtime_exit_condition = _no_async_condition;
1200 return x;
1201 }
1203 // Are any async conditions present?
1204 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1206 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1208 // these next two are also used for self-suspension and async exception support
1209 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1211 // Return true if JavaThread has an asynchronous condition or
1212 // if external suspension is requested.
1213 bool has_special_runtime_exit_condition() {
1214 // We call is_external_suspend() last since external suspend should
1215 // be less common. Because we don't use is_external_suspend_with_lock
1216 // it is possible that we won't see an asynchronous external suspend
1217 // request that has just gotten started, i.e., SR_lock grabbed but
1218 // _external_suspend field change either not made yet or not visible
1219 // yet. However, this is okay because the request is asynchronous and
1220 // we will see the new flag value the next time through. It's also
1221 // possible that the external suspend request is dropped after
1222 // we have checked is_external_suspend(), we will recheck its value
1223 // under SR_lock in java_suspend_self().
1224 return (_special_runtime_exit_condition != _no_async_condition) ||
1225 is_external_suspend() || is_deopt_suspend();
1226 }
1228 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1230 void set_pending_async_exception(oop e) {
1231 _pending_async_exception = e;
1232 _special_runtime_exit_condition = _async_exception;
1233 set_has_async_exception();
1234 }
1236 // Fast-locking support
1237 bool is_lock_owned(address adr) const;
1239 // Accessors for vframe array top
1240 // The linked list of vframe arrays are sorted on sp. This means when we
1241 // unpack the head must contain the vframe array to unpack.
1242 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1243 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1245 // Side structure for defering update of java frame locals until deopt occurs
1246 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1247 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1249 // These only really exist to make debugging deopt problems simpler
1251 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1252 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1254 // The special resourceMark used during deoptimization
1256 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1257 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1259 intptr_t* must_deopt_id() { return _must_deopt_id; }
1260 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1261 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1263 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1264 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1266 Method* callee_target() const { return _callee_target; }
1267 void set_callee_target (Method* x) { _callee_target = x; }
1269 // Oop results of vm runtime calls
1270 oop vm_result() const { return _vm_result; }
1271 void set_vm_result (oop x) { _vm_result = x; }
1273 Metadata* vm_result_2() const { return _vm_result_2; }
1274 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1276 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1277 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1279 // Exception handling for compiled methods
1280 oop exception_oop() const { return _exception_oop; }
1281 address exception_pc() const { return _exception_pc; }
1282 address exception_handler_pc() const { return _exception_handler_pc; }
1283 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1285 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1286 void set_exception_pc(address a) { _exception_pc = a; }
1287 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1288 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1290 void clear_exception_oop_and_pc() {
1291 set_exception_oop(NULL);
1292 set_exception_pc(NULL);
1293 }
1295 // Stack overflow support
1296 inline size_t stack_available(address cur_sp);
1297 address stack_yellow_zone_base()
1298 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1299 size_t stack_yellow_zone_size()
1300 { return StackYellowPages * os::vm_page_size(); }
1301 address stack_red_zone_base()
1302 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1303 size_t stack_red_zone_size()
1304 { return StackRedPages * os::vm_page_size(); }
1305 bool in_stack_yellow_zone(address a)
1306 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1307 bool in_stack_red_zone(address a)
1308 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1310 void create_stack_guard_pages();
1311 void remove_stack_guard_pages();
1313 void enable_stack_yellow_zone();
1314 void disable_stack_yellow_zone();
1315 void enable_stack_red_zone();
1316 void disable_stack_red_zone();
1318 inline bool stack_guard_zone_unused();
1319 inline bool stack_yellow_zone_disabled();
1320 inline bool stack_yellow_zone_enabled();
1322 // Attempt to reguard the stack after a stack overflow may have occurred.
1323 // Returns true if (a) guard pages are not needed on this thread, (b) the
1324 // pages are already guarded, or (c) the pages were successfully reguarded.
1325 // Returns false if there is not enough stack space to reguard the pages, in
1326 // which case the caller should unwind a frame and try again. The argument
1327 // should be the caller's (approximate) sp.
1328 bool reguard_stack(address cur_sp);
1329 // Similar to above but see if current stackpoint is out of the guard area
1330 // and reguard if possible.
1331 bool reguard_stack(void);
1333 address stack_overflow_limit() { return _stack_overflow_limit; }
1334 void set_stack_overflow_limit() {
1335 _stack_overflow_limit = _stack_base - _stack_size +
1336 ((StackShadowPages +
1337 StackYellowPages +
1338 StackRedPages) * os::vm_page_size());
1339 }
1341 // Misc. accessors/mutators
1342 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1343 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1344 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1346 #ifndef PRODUCT
1347 void record_jump(address target, address instr, const char* file, int line);
1348 #endif /* PRODUCT */
1350 // For assembly stub generation
1351 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1352 #ifndef PRODUCT
1353 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1354 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1355 #endif /* PRODUCT */
1356 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1357 static ByteSize last_Java_sp_offset() {
1358 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1359 }
1360 static ByteSize last_Java_pc_offset() {
1361 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1362 }
1363 static ByteSize frame_anchor_offset() {
1364 return byte_offset_of(JavaThread, _anchor);
1365 }
1366 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1367 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1368 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1369 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1370 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1371 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1372 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1373 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1374 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1375 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1376 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1377 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1378 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1380 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1381 static ByteSize should_post_on_exceptions_flag_offset() {
1382 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1383 }
1385 #if INCLUDE_ALL_GCS
1386 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1387 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1388 #endif // INCLUDE_ALL_GCS
1390 // Returns the jni environment for this thread
1391 JNIEnv* jni_environment() { return &_jni_environment; }
1393 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1394 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1395 // Only return NULL if thread is off the thread list; starting to
1396 // exit should not return NULL.
1397 if (thread_from_jni_env->is_terminated()) {
1398 thread_from_jni_env->block_if_vm_exited();
1399 return NULL;
1400 } else {
1401 return thread_from_jni_env;
1402 }
1403 }
1405 // JNI critical regions. These can nest.
1406 bool in_critical() { return _jni_active_critical > 0; }
1407 bool in_last_critical() { return _jni_active_critical == 1; }
1408 void enter_critical() { assert(Thread::current() == this ||
1409 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1410 "this must be current thread or synchronizing");
1411 _jni_active_critical++; }
1412 void exit_critical() { assert(Thread::current() == this,
1413 "this must be current thread");
1414 _jni_active_critical--;
1415 assert(_jni_active_critical >= 0,
1416 "JNI critical nesting problem?"); }
1418 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1419 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1420 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1421 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1422 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1424 // For deadlock detection
1425 int depth_first_number() { return _depth_first_number; }
1426 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1428 private:
1429 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1431 public:
1432 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1433 void add_monitor_chunk(MonitorChunk* chunk);
1434 void remove_monitor_chunk(MonitorChunk* chunk);
1435 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1436 void inc_in_deopt_handler() { _in_deopt_handler++; }
1437 void dec_in_deopt_handler() {
1438 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1439 if (_in_deopt_handler > 0) { // robustness
1440 _in_deopt_handler--;
1441 }
1442 }
1444 private:
1445 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1447 public:
1449 // Frame iteration; calls the function f for all frames on the stack
1450 void frames_do(void f(frame*, const RegisterMap*));
1452 // Memory operations
1453 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1455 // Sweeper operations
1456 void nmethods_do(CodeBlobClosure* cf);
1458 // RedefineClasses Support
1459 void metadata_do(void f(Metadata*));
1461 // Memory management operations
1462 void gc_epilogue();
1463 void gc_prologue();
1465 // Misc. operations
1466 char* name() const { return (char*)get_thread_name(); }
1467 void print_on(outputStream* st) const;
1468 void print() const { print_on(tty); }
1469 void print_value();
1470 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1471 void print_thread_state() const PRODUCT_RETURN;
1472 void print_on_error(outputStream* st, char* buf, int buflen) const;
1473 void verify();
1474 const char* get_thread_name() const;
1475 private:
1476 // factor out low-level mechanics for use in both normal and error cases
1477 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1478 public:
1479 const char* get_threadgroup_name() const;
1480 const char* get_parent_name() const;
1482 // Accessing frames
1483 frame last_frame() {
1484 _anchor.make_walkable(this);
1485 return pd_last_frame();
1486 }
1487 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1489 // Returns method at 'depth' java or native frames down the stack
1490 // Used for security checks
1491 Klass* security_get_caller_class(int depth);
1493 // Print stack trace in external format
1494 void print_stack_on(outputStream* st);
1495 void print_stack() { print_stack_on(tty); }
1497 // Print stack traces in various internal formats
1498 void trace_stack() PRODUCT_RETURN;
1499 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1500 void trace_frames() PRODUCT_RETURN;
1501 void trace_oops() PRODUCT_RETURN;
1503 // Print an annotated view of the stack frames
1504 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1505 void validate_frame_layout() {
1506 print_frame_layout(0, true);
1507 }
1509 // Returns the number of stack frames on the stack
1510 int depth() const;
1512 // Function for testing deoptimization
1513 void deoptimize();
1514 void make_zombies();
1516 void deoptimized_wrt_marked_nmethods();
1518 // Profiling operation (see fprofile.cpp)
1519 public:
1520 bool profile_last_Java_frame(frame* fr);
1522 private:
1523 ThreadProfiler* _thread_profiler;
1524 private:
1525 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1526 friend class FlatProfilerTask; // uses get_thread_profiler.
1527 friend class ThreadProfilerMark; // uses get_thread_profiler.
1528 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1529 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1530 ThreadProfiler* result = _thread_profiler;
1531 _thread_profiler = tp;
1532 return result;
1533 }
1535 public:
1536 // Returns the running thread as a JavaThread
1537 static inline JavaThread* current();
1539 // Returns the active Java thread. Do not use this if you know you are calling
1540 // from a JavaThread, as it's slower than JavaThread::current. If called from
1541 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1542 // operation. You may not want that either.
1543 static JavaThread* active();
1545 inline CompilerThread* as_CompilerThread();
1547 public:
1548 virtual void run();
1549 void thread_main_inner();
1551 private:
1552 // PRIVILEGED STACK
1553 PrivilegedElement* _privileged_stack_top;
1554 GrowableArray<oop>* _array_for_gc;
1555 public:
1557 // Returns the privileged_stack information.
1558 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1559 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1560 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1562 public:
1563 // Thread local information maintained by JVMTI.
1564 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1565 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1566 // getter is used to get this JavaThread's JvmtiThreadState if it has
1567 // one which means NULL can be returned. JvmtiThreadState::state_for()
1568 // is used to get the specified JavaThread's JvmtiThreadState if it has
1569 // one or it allocates a new JvmtiThreadState for the JavaThread and
1570 // returns it. JvmtiThreadState::state_for() will return NULL only if
1571 // the specified JavaThread is exiting.
1572 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1573 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1574 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1575 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1577 // JVMTI PopFrame support
1578 // Setting and clearing popframe_condition
1579 // All of these enumerated values are bits. popframe_pending
1580 // indicates that a PopFrame() has been requested and not yet been
1581 // completed. popframe_processing indicates that that PopFrame() is in
1582 // the process of being completed. popframe_force_deopt_reexecution_bit
1583 // indicates that special handling is required when returning to a
1584 // deoptimized caller.
1585 enum PopCondition {
1586 popframe_inactive = 0x00,
1587 popframe_pending_bit = 0x01,
1588 popframe_processing_bit = 0x02,
1589 popframe_force_deopt_reexecution_bit = 0x04
1590 };
1591 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1592 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1593 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1594 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1595 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1596 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1597 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1598 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1599 #ifdef CC_INTERP
1600 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1601 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1602 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1603 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1604 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1605 #endif
1607 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1608 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1609 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1611 private:
1612 // Saved incoming arguments to popped frame.
1613 // Used only when popped interpreted frame returns to deoptimized frame.
1614 void* _popframe_preserved_args;
1615 int _popframe_preserved_args_size;
1617 public:
1618 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1619 void* popframe_preserved_args();
1620 ByteSize popframe_preserved_args_size();
1621 WordSize popframe_preserved_args_size_in_words();
1622 void popframe_free_preserved_args();
1625 private:
1626 JvmtiThreadState *_jvmti_thread_state;
1627 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1629 // Used by the interpreter in fullspeed mode for frame pop, method
1630 // entry, method exit and single stepping support. This field is
1631 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1632 // It can be set to zero asynchronously (i.e., without a VM operation
1633 // or a lock) so we have to be very careful.
1634 int _interp_only_mode;
1636 public:
1637 // used by the interpreter for fullspeed debugging support (see above)
1638 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1639 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1640 int get_interp_only_mode() { return _interp_only_mode; }
1641 void increment_interp_only_mode() { ++_interp_only_mode; }
1642 void decrement_interp_only_mode() { --_interp_only_mode; }
1644 // support for cached flag that indicates whether exceptions need to be posted for this thread
1645 // if this is false, we can avoid deoptimizing when events are thrown
1646 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1647 private:
1648 int _should_post_on_exceptions_flag;
1650 public:
1651 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1652 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1654 private:
1655 ThreadStatistics *_thread_stat;
1657 public:
1658 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1660 // Return a blocker object for which this thread is blocked parking.
1661 oop current_park_blocker();
1663 private:
1664 static size_t _stack_size_at_create;
1666 public:
1667 static inline size_t stack_size_at_create(void) {
1668 return _stack_size_at_create;
1669 }
1670 static inline void set_stack_size_at_create(size_t value) {
1671 _stack_size_at_create = value;
1672 }
1674 #if INCLUDE_ALL_GCS
1675 // SATB marking queue support
1676 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1677 static SATBMarkQueueSet& satb_mark_queue_set() {
1678 return _satb_mark_queue_set;
1679 }
1681 // Dirty card queue support
1682 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1683 static DirtyCardQueueSet& dirty_card_queue_set() {
1684 return _dirty_card_queue_set;
1685 }
1686 #endif // INCLUDE_ALL_GCS
1688 // This method initializes the SATB and dirty card queues before a
1689 // JavaThread is added to the Java thread list. Right now, we don't
1690 // have to do anything to the dirty card queue (it should have been
1691 // activated when the thread was created), but we have to activate
1692 // the SATB queue if the thread is created while a marking cycle is
1693 // in progress. The activation / de-activation of the SATB queues at
1694 // the beginning / end of a marking cycle is done during safepoints
1695 // so we have to make sure this method is called outside one to be
1696 // able to safely read the active field of the SATB queue set. Right
1697 // now, it is called just before the thread is added to the Java
1698 // thread list in the Threads::add() method. That method is holding
1699 // the Threads_lock which ensures we are outside a safepoint. We
1700 // cannot do the obvious and set the active field of the SATB queue
1701 // when the thread is created given that, in some cases, safepoints
1702 // might happen between the JavaThread constructor being called and the
1703 // thread being added to the Java thread list (an example of this is
1704 // when the structure for the DestroyJavaVM thread is created).
1705 #if INCLUDE_ALL_GCS
1706 void initialize_queues();
1707 #else // INCLUDE_ALL_GCS
1708 void initialize_queues() { }
1709 #endif // INCLUDE_ALL_GCS
1711 // Machine dependent stuff
1712 #ifdef TARGET_OS_ARCH_linux_x86
1713 # include "thread_linux_x86.hpp"
1714 #endif
1715 #ifdef TARGET_OS_ARCH_linux_mips
1716 # include "thread_linux_mips.hpp"
1717 #endif
1718 #ifdef TARGET_OS_ARCH_linux_sparc
1719 # include "thread_linux_sparc.hpp"
1720 #endif
1721 #ifdef TARGET_OS_ARCH_linux_zero
1722 # include "thread_linux_zero.hpp"
1723 #endif
1724 #ifdef TARGET_OS_ARCH_solaris_x86
1725 # include "thread_solaris_x86.hpp"
1726 #endif
1727 #ifdef TARGET_OS_ARCH_solaris_sparc
1728 # include "thread_solaris_sparc.hpp"
1729 #endif
1730 #ifdef TARGET_OS_ARCH_windows_x86
1731 # include "thread_windows_x86.hpp"
1732 #endif
1733 #ifdef TARGET_OS_ARCH_linux_arm
1734 # include "thread_linux_arm.hpp"
1735 #endif
1736 #ifdef TARGET_OS_ARCH_linux_ppc
1737 # include "thread_linux_ppc.hpp"
1738 #endif
1739 #ifdef TARGET_OS_ARCH_aix_ppc
1740 # include "thread_aix_ppc.hpp"
1741 #endif
1742 #ifdef TARGET_OS_ARCH_bsd_x86
1743 # include "thread_bsd_x86.hpp"
1744 #endif
1745 #ifdef TARGET_OS_ARCH_bsd_zero
1746 # include "thread_bsd_zero.hpp"
1747 #endif
1750 public:
1751 void set_blocked_on_compilation(bool value) {
1752 _blocked_on_compilation = value;
1753 }
1755 bool blocked_on_compilation() {
1756 return _blocked_on_compilation;
1757 }
1758 protected:
1759 bool _blocked_on_compilation;
1762 // JSR166 per-thread parker
1763 private:
1764 Parker* _parker;
1765 public:
1766 Parker* parker() { return _parker; }
1768 // Biased locking support
1769 private:
1770 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1771 public:
1772 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1773 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1775 // clearing/querying jni attach status
1776 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1777 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1778 inline void set_done_attaching_via_jni();
1779 private:
1780 // This field is used to determine if a thread has claimed
1781 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1782 // otherwise its value is the par_id that has been claimed.
1783 uint _claimed_par_id;
1784 public:
1785 uint get_claimed_par_id() { return _claimed_par_id; }
1786 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1787 };
1789 // Inline implementation of JavaThread::current
1790 inline JavaThread* JavaThread::current() {
1791 Thread* thread = ThreadLocalStorage::thread();
1792 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1793 return (JavaThread*)thread;
1794 }
1796 inline CompilerThread* JavaThread::as_CompilerThread() {
1797 assert(is_Compiler_thread(), "just checking");
1798 return (CompilerThread*)this;
1799 }
1801 inline bool JavaThread::stack_guard_zone_unused() {
1802 return _stack_guard_state == stack_guard_unused;
1803 }
1805 inline bool JavaThread::stack_yellow_zone_disabled() {
1806 return _stack_guard_state == stack_guard_yellow_disabled;
1807 }
1809 inline bool JavaThread::stack_yellow_zone_enabled() {
1810 #ifdef ASSERT
1811 if (os::uses_stack_guard_pages()) {
1812 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1813 }
1814 #endif
1815 return _stack_guard_state == stack_guard_enabled;
1816 }
1818 inline size_t JavaThread::stack_available(address cur_sp) {
1819 // This code assumes java stacks grow down
1820 address low_addr; // Limit on the address for deepest stack depth
1821 if ( _stack_guard_state == stack_guard_unused) {
1822 low_addr = stack_base() - stack_size();
1823 } else {
1824 low_addr = stack_yellow_zone_base();
1825 }
1826 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1827 }
1829 // A thread used for Compilation.
1830 class CompilerThread : public JavaThread {
1831 friend class VMStructs;
1832 private:
1833 CompilerCounters* _counters;
1835 ciEnv* _env;
1836 CompileLog* _log;
1837 CompileTask* _task;
1838 CompileQueue* _queue;
1839 BufferBlob* _buffer_blob;
1841 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1842 AbstractCompiler* _compiler;
1844 public:
1846 static CompilerThread* current();
1848 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1850 bool is_Compiler_thread() const { return true; }
1851 // Hide this compiler thread from external view.
1852 bool is_hidden_from_external_view() const { return true; }
1854 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1855 AbstractCompiler* compiler() const { return _compiler; }
1857 CompileQueue* queue() const { return _queue; }
1858 CompilerCounters* counters() const { return _counters; }
1860 // Get/set the thread's compilation environment.
1861 ciEnv* env() { return _env; }
1862 void set_env(ciEnv* env) { _env = env; }
1864 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1865 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1867 // Get/set the thread's logging information
1868 CompileLog* log() { return _log; }
1869 void init_log(CompileLog* log) {
1870 // Set once, for good.
1871 assert(_log == NULL, "set only once");
1872 _log = log;
1873 }
1875 // GC support
1876 // Apply "f->do_oop" to all root oops in "this".
1877 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1878 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1880 #ifndef PRODUCT
1881 private:
1882 IdealGraphPrinter *_ideal_graph_printer;
1883 public:
1884 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1885 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1886 #endif
1888 // Get/set the thread's current task
1889 CompileTask* task() { return _task; }
1890 void set_task(CompileTask* task) { _task = task; }
1892 // Track the nmethod currently being scanned by the sweeper
1893 void set_scanned_nmethod(nmethod* nm) {
1894 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1895 _scanned_nmethod = nm;
1896 }
1897 };
1899 inline CompilerThread* CompilerThread::current() {
1900 return JavaThread::current()->as_CompilerThread();
1901 }
1904 // The active thread queue. It also keeps track of the current used
1905 // thread priorities.
1906 class Threads: AllStatic {
1907 friend class VMStructs;
1908 private:
1909 static JavaThread* _thread_list;
1910 static int _number_of_threads;
1911 static int _number_of_non_daemon_threads;
1912 static int _return_code;
1913 #ifdef ASSERT
1914 static bool _vm_complete;
1915 #endif
1917 public:
1918 // Thread management
1919 // force_daemon is a concession to JNI, where we may need to add a
1920 // thread to the thread list before allocating its thread object
1921 static void add(JavaThread* p, bool force_daemon = false);
1922 static void remove(JavaThread* p);
1923 static bool includes(JavaThread* p);
1924 static JavaThread* first() { return _thread_list; }
1925 static void threads_do(ThreadClosure* tc);
1927 // Initializes the vm and creates the vm thread
1928 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1929 static void convert_vm_init_libraries_to_agents();
1930 static void create_vm_init_libraries();
1931 static void create_vm_init_agents();
1932 static void shutdown_vm_agents();
1933 static bool destroy_vm();
1934 // Supported VM versions via JNI
1935 // Includes JNI_VERSION_1_1
1936 static jboolean is_supported_jni_version_including_1_1(jint version);
1937 // Does not include JNI_VERSION_1_1
1938 static jboolean is_supported_jni_version(jint version);
1940 // Garbage collection
1941 static void follow_other_roots(void f(oop*));
1943 // Apply "f->do_oop" to all root oops in all threads.
1944 // This version may only be called by sequential code.
1945 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1946 // This version may be called by sequential or parallel code.
1947 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1948 // This creates a list of GCTasks, one per thread.
1949 static void create_thread_roots_tasks(GCTaskQueue* q);
1950 // This creates a list of GCTasks, one per thread, for marking objects.
1951 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1953 // Apply "f->do_oop" to roots in all threads that
1954 // are part of compiled frames
1955 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1957 static void convert_hcode_pointers();
1958 static void restore_hcode_pointers();
1960 // Sweeper
1961 static void nmethods_do(CodeBlobClosure* cf);
1963 // RedefineClasses support
1964 static void metadata_do(void f(Metadata*));
1966 static void gc_epilogue();
1967 static void gc_prologue();
1968 #ifdef ASSERT
1969 static bool is_vm_complete() { return _vm_complete; }
1970 #endif
1972 // Verification
1973 static void verify();
1974 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1975 static void print(bool print_stacks, bool internal_format) {
1976 // this function is only used by debug.cpp
1977 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1978 }
1979 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1981 // Get Java threads that are waiting to enter a monitor. If doLock
1982 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1983 // VM needs to be at a safepoint.
1984 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1985 address monitor, bool doLock);
1987 // Get owning Java thread from the monitor's owner field. If doLock
1988 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1989 // VM needs to be at a safepoint.
1990 static JavaThread *owning_thread_from_monitor_owner(address owner,
1991 bool doLock);
1993 // Number of threads on the active threads list
1994 static int number_of_threads() { return _number_of_threads; }
1995 // Number of non-daemon threads on the active threads list
1996 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1998 // Deoptimizes all frames tied to marked nmethods
1999 static void deoptimized_wrt_marked_nmethods();
2001 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2003 };
2006 // Thread iterator
2007 class ThreadClosure: public StackObj {
2008 public:
2009 virtual void do_thread(Thread* thread) = 0;
2010 };
2012 class SignalHandlerMark: public StackObj {
2013 private:
2014 Thread* _thread;
2015 public:
2016 SignalHandlerMark(Thread* t) {
2017 _thread = t;
2018 if (_thread) _thread->enter_signal_handler();
2019 }
2020 ~SignalHandlerMark() {
2021 if (_thread) _thread->leave_signal_handler();
2022 _thread = NULL;
2023 }
2024 };
2027 #endif // SHARE_VM_RUNTIME_THREAD_HPP