Sat, 07 Nov 2020 10:30:02 +0800
Added tag mips-jdk8u275-b01 for changeset d3b4d62f391f
1 /*
2 * Copyright (c) 1997, 2018, 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 "utilities/exceptions.hpp"
52 #include "utilities/macros.hpp"
53 #include "utilities/top.hpp"
54 #if INCLUDE_ALL_GCS
55 #include "gc_implementation/g1/dirtyCardQueue.hpp"
56 #include "gc_implementation/g1/satbQueue.hpp"
57 #endif // INCLUDE_ALL_GCS
58 #ifdef TARGET_ARCH_zero
59 # include "stack_zero.hpp"
60 #endif
61 #if INCLUDE_JFR
62 #include "jfr/support/jfrThreadExtension.hpp"
63 #endif
65 class ThreadSafepointState;
66 class ThreadProfiler;
68 class JvmtiThreadState;
69 class JvmtiGetLoadedClassesClosure;
70 class ThreadStatistics;
71 class ConcurrentLocksDump;
72 class ParkEvent;
73 class Parker;
75 class ciEnv;
76 class CompileThread;
77 class CompileLog;
78 class CompileTask;
79 class CompileQueue;
80 class CompilerCounters;
81 class vframeArray;
83 class DeoptResourceMark;
84 class jvmtiDeferredLocalVariableSet;
86 class GCTaskQueue;
87 class ThreadClosure;
88 class IdealGraphPrinter;
90 class Metadata;
91 template <class T, MEMFLAGS F> class ChunkedList;
92 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
94 DEBUG_ONLY(class ResourceMark;)
96 class WorkerThread;
98 // Class hierarchy
99 // - Thread
100 // - NamedThread
101 // - VMThread
102 // - ConcurrentGCThread
103 // - WorkerThread
104 // - GangWorker
105 // - GCTaskThread
106 // - JavaThread
107 // - WatcherThread
109 class Thread: public ThreadShadow {
110 friend class VMStructs;
111 private:
112 // Exception handling
113 // (Note: _pending_exception and friends are in ThreadShadow)
114 //oop _pending_exception; // pending exception for current thread
115 // const char* _exception_file; // file information for exception (debugging only)
116 // int _exception_line; // line information for exception (debugging only)
117 protected:
118 // Support for forcing alignment of thread objects for biased locking
119 void* _real_malloc_address;
120 public:
121 void* operator new(size_t size) throw() { return allocate(size, true); }
122 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
123 return allocate(size, false); }
124 void operator delete(void* p);
126 protected:
127 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
128 private:
130 // ***************************************************************
131 // Suspend and resume support
132 // ***************************************************************
133 //
134 // VM suspend/resume no longer exists - it was once used for various
135 // things including safepoints but was deprecated and finally removed
136 // in Java 7. Because VM suspension was considered "internal" Java-level
137 // suspension was considered "external", and this legacy naming scheme
138 // remains.
139 //
140 // External suspend/resume requests come from JVM_SuspendThread,
141 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
142 // ResumeThread. External
143 // suspend requests cause _external_suspend to be set and external
144 // resume requests cause _external_suspend to be cleared.
145 // External suspend requests do not nest on top of other external
146 // suspend requests. The higher level APIs reject suspend requests
147 // for already suspended threads.
148 //
149 // The external_suspend
150 // flag is checked by has_special_runtime_exit_condition() and java thread
151 // will self-suspend when handle_special_runtime_exit_condition() is
152 // called. Most uses of the _thread_blocked state in JavaThreads are
153 // considered the same as being externally suspended; if the blocking
154 // condition lifts, the JavaThread will self-suspend. Other places
155 // where VM checks for external_suspend include:
156 // + mutex granting (do not enter monitors when thread is suspended)
157 // + state transitions from _thread_in_native
158 //
159 // In general, java_suspend() does not wait for an external suspend
160 // request to complete. When it returns, the only guarantee is that
161 // the _external_suspend field is true.
162 //
163 // wait_for_ext_suspend_completion() is used to wait for an external
164 // suspend request to complete. External suspend requests are usually
165 // followed by some other interface call that requires the thread to
166 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
167 // the interface that requires quiescence, we give the JavaThread a
168 // chance to self-suspend before we need it to be quiescent. This
169 // improves overall suspend/query performance.
170 //
171 // _suspend_flags controls the behavior of java_ suspend/resume.
172 // It must be set under the protection of SR_lock. Read from the flag is
173 // OK without SR_lock as long as the value is only used as a hint.
174 // (e.g., check _external_suspend first without lock and then recheck
175 // inside SR_lock and finish the suspension)
176 //
177 // _suspend_flags is also overloaded for other "special conditions" so
178 // that a single check indicates whether any special action is needed
179 // eg. for async exceptions.
180 // -------------------------------------------------------------------
181 // Notes:
182 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
183 // but we still update its value to keep other part of the system (mainly
184 // JVMTI) happy. ThreadState is legacy code (see notes in
185 // osThread.hpp).
186 //
187 // 2. It would be more natural if set_external_suspend() is private and
188 // part of java_suspend(), but that probably would affect the suspend/query
189 // performance. Need more investigation on this.
190 //
192 // suspend/resume lock: used for self-suspend
193 Monitor* _SR_lock;
195 protected:
196 enum SuspendFlags {
197 // NOTE: avoid using the sign-bit as cc generates different test code
198 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
200 _external_suspend = 0x20000000U, // thread is asked to self suspend
201 _ext_suspended = 0x40000000U, // thread has self-suspended
202 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
204 _has_async_exception = 0x00000001U, // there is a pending async exception
205 _critical_native_unlock = 0x00000002U, // Must call back to unlock JNI critical lock
207 JFR_ONLY(_trace_flag = 0x00000004U) // call jfr tracing
208 };
210 // various suspension related flags - atomically updated
211 // overloaded for async exception checking in check_special_condition_for_native_trans.
212 volatile uint32_t _suspend_flags;
214 private:
215 int _num_nested_signal;
217 public:
218 void enter_signal_handler() { _num_nested_signal++; }
219 void leave_signal_handler() { _num_nested_signal--; }
220 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
222 private:
223 // Debug tracing
224 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
226 // Active_handles points to a block of handles
227 JNIHandleBlock* _active_handles;
229 // One-element thread local free list
230 JNIHandleBlock* _free_handle_block;
232 // Point to the last handle mark
233 HandleMark* _last_handle_mark;
235 // The parity of the last strong_roots iteration in which this thread was
236 // claimed as a task.
237 jint _oops_do_parity;
239 public:
240 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
241 HandleMark* last_handle_mark() const { return _last_handle_mark; }
242 private:
244 // debug support for checking if code does allow safepoints or not
245 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
246 // mutex, or blocking on an object synchronizer (Java locking).
247 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
248 // If !allow_allocation(), then an assertion failure will happen during allocation
249 // (Hence, !allow_safepoint() => !allow_allocation()).
250 //
251 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
252 //
253 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
254 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
256 // Used by SkipGCALot class.
257 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
259 friend class No_Alloc_Verifier;
260 friend class No_Safepoint_Verifier;
261 friend class Pause_No_Safepoint_Verifier;
262 friend class ThreadLocalStorage;
263 friend class GC_locker;
265 ThreadLocalAllocBuffer _tlab; // Thread-local eden
266 jlong _allocated_bytes; // Cumulative number of bytes allocated on
267 // the Java heap
269 // Thread-local buffer used by MetadataOnStackMark.
270 MetadataOnStackBuffer* _metadata_on_stack_buffer;
272 JFR_ONLY(DEFINE_THREAD_LOCAL_FIELD_JFR;) // Thread-local data for jfr
274 ThreadExt _ext;
276 int _vm_operation_started_count; // VM_Operation support
277 int _vm_operation_completed_count; // VM_Operation support
279 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
280 // is waiting to lock
281 bool _current_pending_monitor_is_from_java; // locking is from Java code
283 // ObjectMonitor on which this thread called Object.wait()
284 ObjectMonitor* _current_waiting_monitor;
286 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
287 public:
288 ObjectMonitor* omFreeList;
289 int omFreeCount; // length of omFreeList
290 int omFreeProvision; // reload chunk size
291 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
292 int omInUseCount; // length of omInUseList
294 #ifdef ASSERT
295 private:
296 bool _visited_for_critical_count;
298 public:
299 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
300 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
301 #endif
303 public:
304 enum {
305 is_definitely_current_thread = true
306 };
308 // Constructor
309 Thread();
310 virtual ~Thread();
312 // initializtion
313 void initialize_thread_local_storage();
315 // thread entry point
316 virtual void run();
318 // Testers
319 virtual bool is_VM_thread() const { return false; }
320 virtual bool is_Java_thread() const { return false; }
321 virtual bool is_Compiler_thread() const { return false; }
322 virtual bool is_hidden_from_external_view() const { return false; }
323 virtual bool is_jvmti_agent_thread() const { return false; }
324 // True iff the thread can perform GC operations at a safepoint.
325 // Generally will be true only of VM thread and parallel GC WorkGang
326 // threads.
327 virtual bool is_GC_task_thread() const { return false; }
328 virtual bool is_Watcher_thread() const { return false; }
329 virtual bool is_ConcurrentGC_thread() const { return false; }
330 virtual bool is_Named_thread() const { return false; }
331 virtual bool is_Worker_thread() const { return false; }
333 // Casts
334 virtual WorkerThread* as_Worker_thread() const { return NULL; }
336 virtual char* name() const { return (char*)"Unknown thread"; }
338 // Returns the current thread
339 static inline Thread* current();
341 // Common thread operations
342 static void set_priority(Thread* thread, ThreadPriority priority);
343 static ThreadPriority get_priority(const Thread* const thread);
344 static void start(Thread* thread);
345 static void interrupt(Thread* thr);
346 static bool is_interrupted(Thread* thr, bool clear_interrupted);
348 void set_native_thread_name(const char *name) {
349 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
350 os::set_native_thread_name(name);
351 }
353 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
354 Monitor* SR_lock() const { return _SR_lock; }
356 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
358 void set_suspend_flag(SuspendFlags f) {
359 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
360 uint32_t flags;
361 do {
362 flags = _suspend_flags;
363 }
364 while (Atomic::cmpxchg((jint)(flags | f),
365 (volatile jint*)&_suspend_flags,
366 (jint)flags) != (jint)flags);
367 }
368 void clear_suspend_flag(SuspendFlags f) {
369 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
370 uint32_t flags;
371 do {
372 flags = _suspend_flags;
373 }
374 while (Atomic::cmpxchg((jint)(flags & ~f),
375 (volatile jint*)&_suspend_flags,
376 (jint)flags) != (jint)flags);
377 }
379 void set_has_async_exception() {
380 set_suspend_flag(_has_async_exception);
381 }
382 void clear_has_async_exception() {
383 clear_suspend_flag(_has_async_exception);
384 }
386 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
388 void set_critical_native_unlock() {
389 set_suspend_flag(_critical_native_unlock);
390 }
391 void clear_critical_native_unlock() {
392 clear_suspend_flag(_critical_native_unlock);
393 }
395 // Support for Unhandled Oop detection
396 #ifdef CHECK_UNHANDLED_OOPS
397 private:
398 UnhandledOops* _unhandled_oops;
399 public:
400 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
401 // Mark oop safe for gc. It may be stack allocated but won't move.
402 void allow_unhandled_oop(oop *op) {
403 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
404 }
405 // Clear oops at safepoint so crashes point to unhandled oop violator
406 void clear_unhandled_oops() {
407 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
408 }
409 #endif // CHECK_UNHANDLED_OOPS
411 #ifndef PRODUCT
412 bool skip_gcalot() { return _skip_gcalot; }
413 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
414 #endif
416 public:
417 // Installs a pending exception to be inserted later
418 static void send_async_exception(oop thread_oop, oop java_throwable);
420 // Resource area
421 ResourceArea* resource_area() const { return _resource_area; }
422 void set_resource_area(ResourceArea* area) { _resource_area = area; }
424 OSThread* osthread() const { return _osthread; }
425 void set_osthread(OSThread* thread) { _osthread = thread; }
427 // JNI handle support
428 JNIHandleBlock* active_handles() const { return _active_handles; }
429 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
430 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
431 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
433 // Internal handle support
434 HandleArea* handle_area() const { return _handle_area; }
435 void set_handle_area(HandleArea* area) { _handle_area = area; }
437 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
438 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
440 // Thread-Local Allocation Buffer (TLAB) support
441 ThreadLocalAllocBuffer& tlab() { return _tlab; }
442 void initialize_tlab() {
443 if (UseTLAB) {
444 tlab().initialize();
445 }
446 }
448 jlong allocated_bytes() { return _allocated_bytes; }
449 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
450 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
451 inline jlong cooked_allocated_bytes();
453 JFR_ONLY(DEFINE_THREAD_LOCAL_ACCESSOR_JFR;)
454 JFR_ONLY(DEFINE_TRACE_SUSPEND_FLAG_METHODS)
456 const ThreadExt& ext() const { return _ext; }
457 ThreadExt& ext() { return _ext; }
459 // VM operation support
460 int vm_operation_ticket() { return ++_vm_operation_started_count; }
461 int vm_operation_completed_count() { return _vm_operation_completed_count; }
462 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
464 // For tracking the heavyweight monitor the thread is pending on.
465 ObjectMonitor* current_pending_monitor() {
466 return _current_pending_monitor;
467 }
468 void set_current_pending_monitor(ObjectMonitor* monitor) {
469 _current_pending_monitor = monitor;
470 }
471 void set_current_pending_monitor_is_from_java(bool from_java) {
472 _current_pending_monitor_is_from_java = from_java;
473 }
474 bool current_pending_monitor_is_from_java() {
475 return _current_pending_monitor_is_from_java;
476 }
478 // For tracking the ObjectMonitor on which this thread called Object.wait()
479 ObjectMonitor* current_waiting_monitor() {
480 return _current_waiting_monitor;
481 }
482 void set_current_waiting_monitor(ObjectMonitor* monitor) {
483 _current_waiting_monitor = monitor;
484 }
486 // GC support
487 // Apply "f->do_oop" to all root oops in "this".
488 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
489 // Used by JavaThread::oops_do.
490 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
491 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
493 // Handles the parallel case for the method below.
494 private:
495 bool claim_oops_do_par_case(int collection_parity);
496 public:
497 // Requires that "collection_parity" is that of the current roots
498 // iteration. If "is_par" is false, sets the parity of "this" to
499 // "collection_parity", and returns "true". If "is_par" is true,
500 // uses an atomic instruction to set the current threads parity to
501 // "collection_parity", if it is not already. Returns "true" iff the
502 // calling thread does the update, this indicates that the calling thread
503 // has claimed the thread's stack as a root groop in the current
504 // collection.
505 bool claim_oops_do(bool is_par, int collection_parity) {
506 if (!is_par) {
507 _oops_do_parity = collection_parity;
508 return true;
509 } else {
510 return claim_oops_do_par_case(collection_parity);
511 }
512 }
514 // Sweeper support
515 void nmethods_do(CodeBlobClosure* cf);
517 // jvmtiRedefineClasses support
518 void metadata_do(void f(Metadata*));
520 // Used by fast lock support
521 virtual bool is_lock_owned(address adr) const;
523 // Check if address is in the stack of the thread (not just for locks).
524 // Warning: the method can only be used on the running thread
525 bool is_in_stack(address adr) const;
526 // Check if address is in the usable part of the stack (excludes protected
527 // guard pages)
528 bool is_in_usable_stack(address adr) const;
530 // Sets this thread as starting thread. Returns failure if thread
531 // creation fails due to lack of memory, too many threads etc.
532 bool set_as_starting_thread();
534 void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; }
535 MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; }
537 protected:
538 // OS data associated with the thread
539 OSThread* _osthread; // Platform-specific thread information
541 // Thread local resource area for temporary allocation within the VM
542 ResourceArea* _resource_area;
544 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
546 // Thread local handle area for allocation of handles within the VM
547 HandleArea* _handle_area;
548 GrowableArray<Metadata*>* _metadata_handles;
550 // Support for stack overflow handling, get_thread, etc.
551 address _stack_base;
552 size_t _stack_size;
553 uintptr_t _self_raw_id; // used by get_thread (mutable)
554 int _lgrp_id;
556 public:
557 // Stack overflow support
558 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
560 void set_stack_base(address base) { _stack_base = base; }
561 size_t stack_size() const { return _stack_size; }
562 void set_stack_size(size_t size) { _stack_size = size; }
563 void record_stack_base_and_size();
565 bool on_local_stack(address adr) const {
566 /* QQQ this has knowledge of direction, ought to be a stack method */
567 return (_stack_base > adr && adr >= (_stack_base - _stack_size));
568 }
570 uintptr_t self_raw_id() { return _self_raw_id; }
571 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
573 int lgrp_id() const { return _lgrp_id; }
574 void set_lgrp_id(int value) { _lgrp_id = value; }
576 // Printing
577 void print_on(outputStream* st) const;
578 void print() const { print_on(tty); }
579 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
581 // Debug-only code
582 #ifdef ASSERT
583 private:
584 // Deadlock detection support for Mutex locks. List of locks own by thread.
585 Monitor* _owned_locks;
586 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
587 // thus the friendship
588 friend class Mutex;
589 friend class Monitor;
591 public:
592 void print_owned_locks_on(outputStream* st) const;
593 void print_owned_locks() const { print_owned_locks_on(tty); }
594 Monitor* owned_locks() const { return _owned_locks; }
595 bool owns_locks() const { return owned_locks() != NULL; }
596 bool owns_locks_but_compiled_lock() const;
598 // Deadlock detection
599 bool allow_allocation() { return _allow_allocation_count == 0; }
600 ResourceMark* current_resource_mark() { return _current_resource_mark; }
601 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
602 #endif
604 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
606 private:
607 volatile int _jvmti_env_iteration_count;
609 public:
610 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
611 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
612 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
614 // Code generation
615 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
616 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
617 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
619 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
620 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
622 #define TLAB_FIELD_OFFSET(name) \
623 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
625 TLAB_FIELD_OFFSET(start)
626 TLAB_FIELD_OFFSET(end)
627 TLAB_FIELD_OFFSET(top)
628 TLAB_FIELD_OFFSET(pf_top)
629 TLAB_FIELD_OFFSET(size) // desired_size
630 TLAB_FIELD_OFFSET(refill_waste_limit)
631 TLAB_FIELD_OFFSET(number_of_refills)
632 TLAB_FIELD_OFFSET(fast_refill_waste)
633 TLAB_FIELD_OFFSET(slow_allocations)
635 #undef TLAB_FIELD_OFFSET
637 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
639 JFR_ONLY(DEFINE_THREAD_LOCAL_OFFSET_JFR;)
641 public:
642 volatile intptr_t _Stalled ;
643 volatile int _TypeTag ;
644 ParkEvent * _ParkEvent ; // for synchronized()
645 ParkEvent * _SleepEvent ; // for Thread.sleep
646 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
647 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
648 int NativeSyncRecursion ; // diagnostic
650 volatile int _OnTrap ; // Resume-at IP delta
651 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
652 jint _hashStateX ; // thread-specific hashCode generator state
653 jint _hashStateY ;
654 jint _hashStateZ ;
655 void * _schedctl ;
658 volatile jint rng [4] ; // RNG for spin loop
660 // Low-level leaf-lock primitives used to implement synchronization
661 // and native monitor-mutex infrastructure.
662 // Not for general synchronization use.
663 static void SpinAcquire (volatile int * Lock, const char * Name) ;
664 static void SpinRelease (volatile int * Lock) ;
665 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
666 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
667 static void muxRelease (volatile intptr_t * Lock) ;
668 };
670 // Inline implementation of Thread::current()
671 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
672 // startup.
673 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
674 // period. This is inlined in thread_<os_family>.inline.hpp.
676 inline Thread* Thread::current() {
677 #ifdef ASSERT
678 // This function is very high traffic. Define PARANOID to enable expensive
679 // asserts.
680 #ifdef PARANOID
681 // Signal handler should call ThreadLocalStorage::get_thread_slow()
682 Thread* t = ThreadLocalStorage::get_thread_slow();
683 assert(t != NULL && !t->is_inside_signal_handler(),
684 "Don't use Thread::current() inside signal handler");
685 #endif
686 #endif
687 Thread* thread = ThreadLocalStorage::thread();
688 assert(thread != NULL, "just checking");
689 return thread;
690 }
692 // Name support for threads. non-JavaThread subclasses with multiple
693 // uniquely named instances should derive from this.
694 class NamedThread: public Thread {
695 friend class VMStructs;
696 enum {
697 max_name_len = 64
698 };
699 private:
700 char* _name;
701 // log JavaThread being processed by oops_do
702 JavaThread* _processed_thread;
704 public:
705 NamedThread();
706 ~NamedThread();
707 // May only be called once per thread.
708 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
709 virtual bool is_Named_thread() const { return true; }
710 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
711 JavaThread *processed_thread() { return _processed_thread; }
712 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
713 };
715 // Worker threads are named and have an id of an assigned work.
716 class WorkerThread: public NamedThread {
717 private:
718 uint _id;
719 public:
720 WorkerThread() : _id(0) { }
721 virtual bool is_Worker_thread() const { return true; }
723 virtual WorkerThread* as_Worker_thread() const {
724 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
725 return (WorkerThread*) this;
726 }
728 void set_id(uint work_id) { _id = work_id; }
729 uint id() const { return _id; }
730 };
732 // A single WatcherThread is used for simulating timer interrupts.
733 class WatcherThread: public Thread {
734 friend class VMStructs;
735 public:
736 virtual void run();
738 private:
739 static WatcherThread* _watcher_thread;
741 static bool _startable;
742 volatile static bool _should_terminate; // updated without holding lock
743 public:
744 enum SomeConstants {
745 delay_interval = 10 // interrupt delay in milliseconds
746 };
748 // Constructor
749 WatcherThread();
751 // Tester
752 bool is_Watcher_thread() const { return true; }
754 // Printing
755 char* name() const { return (char*)"VM Periodic Task Thread"; }
756 void print_on(outputStream* st) const;
757 void print() const { print_on(tty); }
758 void unpark();
760 // Returns the single instance of WatcherThread
761 static WatcherThread* watcher_thread() { return _watcher_thread; }
763 // Create and start the single instance of WatcherThread, or stop it on shutdown
764 static void start();
765 static void stop();
766 // Only allow start once the VM is sufficiently initialized
767 // Otherwise the first task to enroll will trigger the start
768 static void make_startable();
769 private:
770 int sleep() const;
771 };
774 class CompilerThread;
776 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
778 class JavaThread: public Thread {
779 friend class VMStructs;
780 private:
781 JavaThread* _next; // The next thread in the Threads list
782 oop _threadObj; // The Java level thread object
784 #ifdef ASSERT
785 private:
786 int _java_call_counter;
788 public:
789 int java_call_counter() { return _java_call_counter; }
790 void inc_java_call_counter() { _java_call_counter++; }
791 void dec_java_call_counter() {
792 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
793 _java_call_counter--;
794 }
795 private: // restore original namespace restriction
796 #endif // ifdef ASSERT
798 #ifndef PRODUCT
799 public:
800 enum {
801 jump_ring_buffer_size = 16
802 };
803 private: // restore original namespace restriction
804 #endif
806 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
808 ThreadFunction _entry_point;
810 JNIEnv _jni_environment;
812 // Deopt support
813 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
815 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
816 // transition out of native
817 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
818 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
819 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
820 // Because deoptimization is lazy we must save jvmti requests to set locals
821 // in compiled frames until we deoptimize and we have an interpreter frame.
822 // This holds the pointer to array (yeah like there might be more than one) of
823 // description of compiled vframes that have locals that need to be updated.
824 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
826 // Handshake value for fixing 6243940. We need a place for the i2c
827 // adapter to store the callee Method*. This value is NEVER live
828 // across a gc point so it does NOT have to be gc'd
829 // The handshake is open ended since we can't be certain that it will
830 // be NULLed. This is because we rarely ever see the race and end up
831 // in handle_wrong_method which is the backend of the handshake. See
832 // code in i2c adapters and handle_wrong_method.
834 Method* _callee_target;
836 // Used to pass back results to the interpreter or generated code running Java code.
837 oop _vm_result; // oop result is GC-preserved
838 Metadata* _vm_result_2; // non-oop result
840 // See ReduceInitialCardMarks: this holds the precise space interval of
841 // the most recent slow path allocation for which compiled code has
842 // elided card-marks for performance along the fast-path.
843 MemRegion _deferred_card_mark;
845 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
846 // allocated during deoptimization
847 // and by JNI_MonitorEnter/Exit
849 // Async. requests support
850 enum AsyncRequests {
851 _no_async_condition = 0,
852 _async_exception,
853 _async_unsafe_access_error
854 };
855 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
856 oop _pending_async_exception;
858 // Safepoint support
859 public: // Expose _thread_state for SafeFetchInt()
860 volatile JavaThreadState _thread_state;
861 private:
862 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
863 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
865 // JavaThread termination support
866 enum TerminatedTypes {
867 _not_terminated = 0xDEAD - 2,
868 _thread_exiting, // JavaThread::exit() has been called for this thread
869 _thread_terminated, // JavaThread is removed from thread list
870 _vm_exited // JavaThread is still executing native code, but VM is terminated
871 // only VM_Exit can set _vm_exited
872 };
874 // In general a JavaThread's _terminated field transitions as follows:
875 //
876 // _not_terminated => _thread_exiting => _thread_terminated
877 //
878 // _vm_exited is a special value to cover the case of a JavaThread
879 // executing native code after the VM itself is terminated.
880 volatile TerminatedTypes _terminated;
881 // suspend/resume support
882 volatile bool _suspend_equivalent; // Suspend equivalent condition
883 jint _in_deopt_handler; // count of deoptimization
884 // handlers thread is in
885 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
886 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
887 // never locked) when throwing an exception. Used by interpreter only.
889 // JNI attach states:
890 enum JNIAttachStates {
891 _not_attaching_via_jni = 1, // thread is not attaching via JNI
892 _attaching_via_jni, // thread is attaching via JNI
893 _attached_via_jni // thread has attached via JNI
894 };
896 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
897 // A native thread that is attaching via JNI starts with a value
898 // of _attaching_via_jni and transitions to _attached_via_jni.
899 volatile JNIAttachStates _jni_attach_state;
901 public:
902 // State of the stack guard pages for this thread.
903 enum StackGuardState {
904 stack_guard_unused, // not needed
905 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
906 stack_guard_enabled // enabled
907 };
909 private:
911 StackGuardState _stack_guard_state;
913 // Precompute the limit of the stack as used in stack overflow checks.
914 // We load it from here to simplify the stack overflow check in assembly.
915 address _stack_overflow_limit;
917 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
918 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
919 // code)
920 volatile oop _exception_oop; // Exception thrown in compiled code
921 volatile address _exception_pc; // PC where exception happened
922 volatile address _exception_handler_pc; // PC for handler of exception
923 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
925 // support for JNI critical regions
926 jint _jni_active_critical; // count of entries into JNI critical region
928 // Checked JNI: function name requires exception check
929 char* _pending_jni_exception_check_fn;
931 // For deadlock detection.
932 int _depth_first_number;
934 // JVMTI PopFrame support
935 // This is set to popframe_pending to signal that top Java frame should be popped immediately
936 int _popframe_condition;
938 // If reallocation of scalar replaced objects fails, we throw OOM
939 // and during exception propagation, pop the top
940 // _frames_to_pop_failed_realloc frames, the ones that reference
941 // failed reallocations.
942 int _frames_to_pop_failed_realloc;
944 #ifndef PRODUCT
945 int _jmp_ring_index;
946 struct {
947 // We use intptr_t instead of address so debugger doesn't try and display strings
948 intptr_t _target;
949 intptr_t _instruction;
950 const char* _file;
951 int _line;
952 } _jmp_ring[ jump_ring_buffer_size ];
953 #endif /* PRODUCT */
955 #if INCLUDE_ALL_GCS
956 // Support for G1 barriers
958 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
959 // Set of all such queues.
960 static SATBMarkQueueSet _satb_mark_queue_set;
962 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
963 // Set of all such queues.
964 static DirtyCardQueueSet _dirty_card_queue_set;
966 void flush_barrier_queues();
967 #endif // INCLUDE_ALL_GCS
969 friend class VMThread;
970 friend class ThreadWaitTransition;
971 friend class VM_Exit;
973 void initialize(); // Initialized the instance variables
975 public:
976 // Constructor
977 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
978 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
979 ~JavaThread();
981 #ifdef ASSERT
982 // verify this JavaThread hasn't be published in the Threads::list yet
983 void verify_not_published();
984 #endif
986 //JNI functiontable getter/setter for JVMTI jni function table interception API.
987 void set_jni_functions(struct JNINativeInterface_* functionTable) {
988 _jni_environment.functions = functionTable;
989 }
990 struct JNINativeInterface_* get_jni_functions() {
991 return (struct JNINativeInterface_ *)_jni_environment.functions;
992 }
994 // This function is called at thread creation to allow
995 // platform specific thread variables to be initialized.
996 void cache_global_variables();
998 // Executes Shutdown.shutdown()
999 void invoke_shutdown_hooks();
1001 // Cleanup on thread exit
1002 enum ExitType {
1003 normal_exit,
1004 jni_detach
1005 };
1006 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1008 void cleanup_failed_attach_current_thread();
1010 // Testers
1011 virtual bool is_Java_thread() const { return true; }
1013 // Thread chain operations
1014 JavaThread* next() const { return _next; }
1015 void set_next(JavaThread* p) { _next = p; }
1017 // Thread oop. threadObj() can be NULL for initial JavaThread
1018 // (or for threads attached via JNI)
1019 oop threadObj() const { return _threadObj; }
1020 void set_threadObj(oop p) { _threadObj = p; }
1022 ThreadPriority java_priority() const; // Read from threadObj()
1024 // Prepare thread and add to priority queue. If a priority is
1025 // not specified, use the priority of the thread object. Threads_lock
1026 // must be held while this function is called.
1027 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1028 void prepare_ext();
1030 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1031 address saved_exception_pc() { return _saved_exception_pc; }
1034 ThreadFunction entry_point() const { return _entry_point; }
1036 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1037 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1039 // Last frame anchor routines
1041 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1043 // last_Java_sp
1044 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1045 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1047 // last_Java_pc
1049 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1051 // Safepoint support
1052 #ifndef PPC64
1053 JavaThreadState thread_state() const { return _thread_state; }
1054 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1055 #else
1056 // Use membars when accessing volatile _thread_state. See
1057 // Threads::create_vm() for size checks.
1058 inline JavaThreadState thread_state() const;
1059 inline void set_thread_state(JavaThreadState s);
1060 #endif
1061 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1062 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1063 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1065 // thread has called JavaThread::exit() or is terminated
1066 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1067 // thread is terminated (no longer on the threads list); we compare
1068 // against the two non-terminated values so that a freed JavaThread
1069 // will also be considered terminated.
1070 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1071 void set_terminated(TerminatedTypes t) { _terminated = t; }
1072 // special for Threads::remove() which is static:
1073 void set_terminated_value() { _terminated = _thread_terminated; }
1074 void block_if_vm_exited();
1076 bool doing_unsafe_access() { return _doing_unsafe_access; }
1077 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1079 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1080 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1082 // Suspend/resume support for JavaThread
1083 private:
1084 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1085 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1087 public:
1088 void java_suspend();
1089 void java_resume();
1090 int java_suspend_self();
1092 void check_and_wait_while_suspended() {
1093 assert(JavaThread::current() == this, "sanity check");
1095 bool do_self_suspend;
1096 do {
1097 // were we externally suspended while we were waiting?
1098 do_self_suspend = handle_special_suspend_equivalent_condition();
1099 if (do_self_suspend) {
1100 // don't surprise the thread that suspended us by returning
1101 java_suspend_self();
1102 set_suspend_equivalent();
1103 }
1104 } while (do_self_suspend);
1105 }
1106 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1107 // Check for async exception in addition to safepoint and suspend request.
1108 static void check_special_condition_for_native_trans(JavaThread *thread);
1110 // Same as check_special_condition_for_native_trans but finishes the
1111 // transition into thread_in_Java mode so that it can potentially
1112 // block.
1113 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1115 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1116 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1117 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1118 // Warning: is_ext_suspend_completed() may temporarily drop the
1119 // SR_lock to allow the thread to reach a stable thread state if
1120 // it is currently in a transient thread state.
1121 return is_ext_suspend_completed(false /*!called_by_wait */,
1122 SuspendRetryDelay, bits);
1123 }
1125 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1126 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1127 // passed as the count and delay parameters. Experiments with specific
1128 // calls to wait_for_ext_suspend_completion() can be done by passing
1129 // other values in the code. Experiments with all calls can be done
1130 // via the appropriate -XX options.
1131 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1133 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1134 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1136 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1137 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1138 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1140 bool is_external_suspend() const {
1141 return (_suspend_flags & _external_suspend) != 0;
1142 }
1143 // Whenever a thread transitions from native to vm/java it must suspend
1144 // if external|deopt suspend is present.
1145 bool is_suspend_after_native() const {
1146 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1147 }
1149 // external suspend request is completed
1150 bool is_ext_suspended() const {
1151 return (_suspend_flags & _ext_suspended) != 0;
1152 }
1154 bool is_external_suspend_with_lock() const {
1155 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1156 return is_external_suspend();
1157 }
1159 // Special method to handle a pending external suspend request
1160 // when a suspend equivalent condition lifts.
1161 bool handle_special_suspend_equivalent_condition() {
1162 assert(is_suspend_equivalent(),
1163 "should only be called in a suspend equivalence condition");
1164 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1165 bool ret = is_external_suspend();
1166 if (!ret) {
1167 // not about to self-suspend so clear suspend equivalence
1168 clear_suspend_equivalent();
1169 }
1170 // implied else:
1171 // We have a pending external suspend request so we leave the
1172 // suspend_equivalent flag set until java_suspend_self() sets
1173 // the ext_suspended flag and clears the suspend_equivalent
1174 // flag. This insures that wait_for_ext_suspend_completion()
1175 // will return consistent values.
1176 return ret;
1177 }
1179 // utility methods to see if we are doing some kind of suspension
1180 bool is_being_ext_suspended() const {
1181 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1182 return is_ext_suspended() || is_external_suspend();
1183 }
1185 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1187 void set_suspend_equivalent() { _suspend_equivalent = true; };
1188 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1190 // Thread.stop support
1191 void send_thread_stop(oop throwable);
1192 AsyncRequests clear_special_runtime_exit_condition() {
1193 AsyncRequests x = _special_runtime_exit_condition;
1194 _special_runtime_exit_condition = _no_async_condition;
1195 return x;
1196 }
1198 // Are any async conditions present?
1199 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1201 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1203 // these next two are also used for self-suspension and async exception support
1204 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1206 // Return true if JavaThread has an asynchronous condition or
1207 // if external suspension is requested.
1208 bool has_special_runtime_exit_condition() {
1209 // We call is_external_suspend() last since external suspend should
1210 // be less common. Because we don't use is_external_suspend_with_lock
1211 // it is possible that we won't see an asynchronous external suspend
1212 // request that has just gotten started, i.e., SR_lock grabbed but
1213 // _external_suspend field change either not made yet or not visible
1214 // yet. However, this is okay because the request is asynchronous and
1215 // we will see the new flag value the next time through. It's also
1216 // possible that the external suspend request is dropped after
1217 // we have checked is_external_suspend(), we will recheck its value
1218 // under SR_lock in java_suspend_self().
1219 return (_special_runtime_exit_condition != _no_async_condition) ||
1220 is_external_suspend() || is_deopt_suspend();
1221 }
1223 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1225 void set_pending_async_exception(oop e) {
1226 _pending_async_exception = e;
1227 _special_runtime_exit_condition = _async_exception;
1228 set_has_async_exception();
1229 }
1231 // Fast-locking support
1232 bool is_lock_owned(address adr) const;
1234 // Accessors for vframe array top
1235 // The linked list of vframe arrays are sorted on sp. This means when we
1236 // unpack the head must contain the vframe array to unpack.
1237 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1238 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1240 // Side structure for defering update of java frame locals until deopt occurs
1241 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1242 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1244 // These only really exist to make debugging deopt problems simpler
1246 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1247 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1249 // The special resourceMark used during deoptimization
1251 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1252 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1254 intptr_t* must_deopt_id() { return _must_deopt_id; }
1255 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1256 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1258 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1259 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1261 Method* callee_target() const { return _callee_target; }
1262 void set_callee_target (Method* x) { _callee_target = x; }
1264 // Oop results of vm runtime calls
1265 oop vm_result() const { return _vm_result; }
1266 void set_vm_result (oop x) { _vm_result = x; }
1268 Metadata* vm_result_2() const { return _vm_result_2; }
1269 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1271 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1272 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1274 // Exception handling for compiled methods
1275 oop exception_oop() const { return _exception_oop; }
1276 address exception_pc() const { return _exception_pc; }
1277 address exception_handler_pc() const { return _exception_handler_pc; }
1278 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1280 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1281 void set_exception_pc(address a) { _exception_pc = a; }
1282 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1283 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1285 void clear_exception_oop_and_pc() {
1286 set_exception_oop(NULL);
1287 set_exception_pc(NULL);
1288 }
1290 // Stack overflow support
1291 inline size_t stack_available(address cur_sp);
1292 address stack_yellow_zone_base()
1293 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1294 size_t stack_yellow_zone_size()
1295 { return StackYellowPages * os::vm_page_size(); }
1296 address stack_red_zone_base()
1297 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1298 size_t stack_red_zone_size()
1299 { return StackRedPages * os::vm_page_size(); }
1300 bool in_stack_yellow_zone(address a)
1301 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1302 bool in_stack_red_zone(address a)
1303 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1305 void create_stack_guard_pages();
1306 void remove_stack_guard_pages();
1308 void enable_stack_yellow_zone();
1309 void disable_stack_yellow_zone();
1310 void enable_stack_red_zone();
1311 void disable_stack_red_zone();
1313 inline bool stack_guard_zone_unused();
1314 inline bool stack_yellow_zone_disabled();
1315 inline bool stack_yellow_zone_enabled();
1317 // Attempt to reguard the stack after a stack overflow may have occurred.
1318 // Returns true if (a) guard pages are not needed on this thread, (b) the
1319 // pages are already guarded, or (c) the pages were successfully reguarded.
1320 // Returns false if there is not enough stack space to reguard the pages, in
1321 // which case the caller should unwind a frame and try again. The argument
1322 // should be the caller's (approximate) sp.
1323 bool reguard_stack(address cur_sp);
1324 // Similar to above but see if current stackpoint is out of the guard area
1325 // and reguard if possible.
1326 bool reguard_stack(void);
1328 address stack_overflow_limit() { return _stack_overflow_limit; }
1329 void set_stack_overflow_limit() {
1330 _stack_overflow_limit = _stack_base - _stack_size +
1331 ((StackShadowPages +
1332 StackYellowPages +
1333 StackRedPages) * os::vm_page_size());
1334 }
1336 // Misc. accessors/mutators
1337 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1338 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1339 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1341 #ifndef PRODUCT
1342 void record_jump(address target, address instr, const char* file, int line);
1343 #endif /* PRODUCT */
1345 // For assembly stub generation
1346 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1347 #ifndef PRODUCT
1348 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1349 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1350 #endif /* PRODUCT */
1351 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1352 static ByteSize last_Java_sp_offset() {
1353 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1354 }
1355 static ByteSize last_Java_pc_offset() {
1356 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1357 }
1358 static ByteSize frame_anchor_offset() {
1359 return byte_offset_of(JavaThread, _anchor);
1360 }
1361 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1362 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1363 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1364 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1365 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1366 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1367 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1368 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1369 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1370 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1371 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1372 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1373 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1375 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1376 static ByteSize should_post_on_exceptions_flag_offset() {
1377 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1378 }
1380 #if INCLUDE_ALL_GCS
1381 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1382 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1383 #endif // INCLUDE_ALL_GCS
1385 // Returns the jni environment for this thread
1386 JNIEnv* jni_environment() { return &_jni_environment; }
1388 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1389 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1390 // Only return NULL if thread is off the thread list; starting to
1391 // exit should not return NULL.
1392 if (thread_from_jni_env->is_terminated()) {
1393 thread_from_jni_env->block_if_vm_exited();
1394 return NULL;
1395 } else {
1396 return thread_from_jni_env;
1397 }
1398 }
1400 // JNI critical regions. These can nest.
1401 bool in_critical() { return _jni_active_critical > 0; }
1402 bool in_last_critical() { return _jni_active_critical == 1; }
1403 void enter_critical() { assert(Thread::current() == this ||
1404 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1405 "this must be current thread or synchronizing");
1406 _jni_active_critical++; }
1407 void exit_critical() { assert(Thread::current() == this,
1408 "this must be current thread");
1409 _jni_active_critical--;
1410 assert(_jni_active_critical >= 0,
1411 "JNI critical nesting problem?"); }
1413 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1414 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1415 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1416 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1417 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1419 // For deadlock detection
1420 int depth_first_number() { return _depth_first_number; }
1421 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1423 private:
1424 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1426 public:
1427 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1428 void add_monitor_chunk(MonitorChunk* chunk);
1429 void remove_monitor_chunk(MonitorChunk* chunk);
1430 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1431 void inc_in_deopt_handler() { _in_deopt_handler++; }
1432 void dec_in_deopt_handler() {
1433 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1434 if (_in_deopt_handler > 0) { // robustness
1435 _in_deopt_handler--;
1436 }
1437 }
1439 private:
1440 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1442 public:
1444 // Frame iteration; calls the function f for all frames on the stack
1445 void frames_do(void f(frame*, const RegisterMap*));
1447 // Memory operations
1448 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1450 // Sweeper operations
1451 void nmethods_do(CodeBlobClosure* cf);
1453 // RedefineClasses Support
1454 void metadata_do(void f(Metadata*));
1456 // Memory management operations
1457 void gc_epilogue();
1458 void gc_prologue();
1460 // Misc. operations
1461 char* name() const { return (char*)get_thread_name(); }
1462 void print_on(outputStream* st) const;
1463 void print() const { print_on(tty); }
1464 void print_value();
1465 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1466 void print_thread_state() const PRODUCT_RETURN;
1467 void print_on_error(outputStream* st, char* buf, int buflen) const;
1468 void verify();
1469 const char* get_thread_name() const;
1470 private:
1471 // factor out low-level mechanics for use in both normal and error cases
1472 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1473 public:
1474 const char* get_threadgroup_name() const;
1475 const char* get_parent_name() const;
1477 // Accessing frames
1478 frame last_frame() {
1479 _anchor.make_walkable(this);
1480 return pd_last_frame();
1481 }
1482 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1484 // Returns method at 'depth' java or native frames down the stack
1485 // Used for security checks
1486 Klass* security_get_caller_class(int depth);
1488 // Print stack trace in external format
1489 void print_stack_on(outputStream* st);
1490 void print_stack() { print_stack_on(tty); }
1492 // Print stack traces in various internal formats
1493 void trace_stack() PRODUCT_RETURN;
1494 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1495 void trace_frames() PRODUCT_RETURN;
1496 void trace_oops() PRODUCT_RETURN;
1498 // Print an annotated view of the stack frames
1499 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1500 void validate_frame_layout() {
1501 print_frame_layout(0, true);
1502 }
1504 // Returns the number of stack frames on the stack
1505 int depth() const;
1507 // Function for testing deoptimization
1508 void deoptimize();
1509 void make_zombies();
1511 void deoptimized_wrt_marked_nmethods();
1513 // Profiling operation (see fprofile.cpp)
1514 public:
1515 bool profile_last_Java_frame(frame* fr);
1517 private:
1518 ThreadProfiler* _thread_profiler;
1519 private:
1520 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1521 friend class FlatProfilerTask; // uses get_thread_profiler.
1522 friend class ThreadProfilerMark; // uses get_thread_profiler.
1523 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1524 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1525 ThreadProfiler* result = _thread_profiler;
1526 _thread_profiler = tp;
1527 return result;
1528 }
1530 public:
1531 // Returns the running thread as a JavaThread
1532 static inline JavaThread* current();
1534 // Returns the active Java thread. Do not use this if you know you are calling
1535 // from a JavaThread, as it's slower than JavaThread::current. If called from
1536 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1537 // operation. You may not want that either.
1538 static JavaThread* active();
1540 inline CompilerThread* as_CompilerThread();
1542 public:
1543 virtual void run();
1544 void thread_main_inner();
1546 private:
1547 // PRIVILEGED STACK
1548 PrivilegedElement* _privileged_stack_top;
1549 GrowableArray<oop>* _array_for_gc;
1550 public:
1552 // Returns the privileged_stack information.
1553 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1554 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1555 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1557 public:
1558 // Thread local information maintained by JVMTI.
1559 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1560 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1561 // getter is used to get this JavaThread's JvmtiThreadState if it has
1562 // one which means NULL can be returned. JvmtiThreadState::state_for()
1563 // is used to get the specified JavaThread's JvmtiThreadState if it has
1564 // one or it allocates a new JvmtiThreadState for the JavaThread and
1565 // returns it. JvmtiThreadState::state_for() will return NULL only if
1566 // the specified JavaThread is exiting.
1567 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1568 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1569 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1570 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1572 // JVMTI PopFrame support
1573 // Setting and clearing popframe_condition
1574 // All of these enumerated values are bits. popframe_pending
1575 // indicates that a PopFrame() has been requested and not yet been
1576 // completed. popframe_processing indicates that that PopFrame() is in
1577 // the process of being completed. popframe_force_deopt_reexecution_bit
1578 // indicates that special handling is required when returning to a
1579 // deoptimized caller.
1580 enum PopCondition {
1581 popframe_inactive = 0x00,
1582 popframe_pending_bit = 0x01,
1583 popframe_processing_bit = 0x02,
1584 popframe_force_deopt_reexecution_bit = 0x04
1585 };
1586 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1587 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1588 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1589 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1590 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1591 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1592 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1593 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1594 #ifdef CC_INTERP
1595 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1596 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1597 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1598 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1599 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1600 #endif
1602 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1603 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1604 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1606 private:
1607 // Saved incoming arguments to popped frame.
1608 // Used only when popped interpreted frame returns to deoptimized frame.
1609 void* _popframe_preserved_args;
1610 int _popframe_preserved_args_size;
1612 public:
1613 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1614 void* popframe_preserved_args();
1615 ByteSize popframe_preserved_args_size();
1616 WordSize popframe_preserved_args_size_in_words();
1617 void popframe_free_preserved_args();
1620 private:
1621 JvmtiThreadState *_jvmti_thread_state;
1622 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1624 // Used by the interpreter in fullspeed mode for frame pop, method
1625 // entry, method exit and single stepping support. This field is
1626 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1627 // It can be set to zero asynchronously (i.e., without a VM operation
1628 // or a lock) so we have to be very careful.
1629 int _interp_only_mode;
1631 public:
1632 // used by the interpreter for fullspeed debugging support (see above)
1633 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1634 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1635 int get_interp_only_mode() { return _interp_only_mode; }
1636 void increment_interp_only_mode() { ++_interp_only_mode; }
1637 void decrement_interp_only_mode() { --_interp_only_mode; }
1639 // support for cached flag that indicates whether exceptions need to be posted for this thread
1640 // if this is false, we can avoid deoptimizing when events are thrown
1641 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1642 private:
1643 int _should_post_on_exceptions_flag;
1645 public:
1646 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1647 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1649 private:
1650 ThreadStatistics *_thread_stat;
1652 public:
1653 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1655 // Return a blocker object for which this thread is blocked parking.
1656 oop current_park_blocker();
1658 private:
1659 static size_t _stack_size_at_create;
1661 public:
1662 static inline size_t stack_size_at_create(void) {
1663 return _stack_size_at_create;
1664 }
1665 static inline void set_stack_size_at_create(size_t value) {
1666 _stack_size_at_create = value;
1667 }
1669 #if INCLUDE_ALL_GCS
1670 // SATB marking queue support
1671 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1672 static SATBMarkQueueSet& satb_mark_queue_set() {
1673 return _satb_mark_queue_set;
1674 }
1676 // Dirty card queue support
1677 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1678 static DirtyCardQueueSet& dirty_card_queue_set() {
1679 return _dirty_card_queue_set;
1680 }
1681 #endif // INCLUDE_ALL_GCS
1683 // This method initializes the SATB and dirty card queues before a
1684 // JavaThread is added to the Java thread list. Right now, we don't
1685 // have to do anything to the dirty card queue (it should have been
1686 // activated when the thread was created), but we have to activate
1687 // the SATB queue if the thread is created while a marking cycle is
1688 // in progress. The activation / de-activation of the SATB queues at
1689 // the beginning / end of a marking cycle is done during safepoints
1690 // so we have to make sure this method is called outside one to be
1691 // able to safely read the active field of the SATB queue set. Right
1692 // now, it is called just before the thread is added to the Java
1693 // thread list in the Threads::add() method. That method is holding
1694 // the Threads_lock which ensures we are outside a safepoint. We
1695 // cannot do the obvious and set the active field of the SATB queue
1696 // when the thread is created given that, in some cases, safepoints
1697 // might happen between the JavaThread constructor being called and the
1698 // thread being added to the Java thread list (an example of this is
1699 // when the structure for the DestroyJavaVM thread is created).
1700 #if INCLUDE_ALL_GCS
1701 void initialize_queues();
1702 #else // INCLUDE_ALL_GCS
1703 void initialize_queues() { }
1704 #endif // INCLUDE_ALL_GCS
1706 // Machine dependent stuff
1707 #ifdef TARGET_OS_ARCH_linux_x86
1708 # include "thread_linux_x86.hpp"
1709 #endif
1710 #ifdef TARGET_OS_ARCH_linux_mips
1711 # include "thread_linux_mips.hpp"
1712 #endif
1713 #ifdef TARGET_OS_ARCH_linux_sparc
1714 # include "thread_linux_sparc.hpp"
1715 #endif
1716 #ifdef TARGET_OS_ARCH_linux_zero
1717 # include "thread_linux_zero.hpp"
1718 #endif
1719 #ifdef TARGET_OS_ARCH_solaris_x86
1720 # include "thread_solaris_x86.hpp"
1721 #endif
1722 #ifdef TARGET_OS_ARCH_solaris_sparc
1723 # include "thread_solaris_sparc.hpp"
1724 #endif
1725 #ifdef TARGET_OS_ARCH_windows_x86
1726 # include "thread_windows_x86.hpp"
1727 #endif
1728 #ifdef TARGET_OS_ARCH_linux_arm
1729 # include "thread_linux_arm.hpp"
1730 #endif
1731 #ifdef TARGET_OS_ARCH_linux_ppc
1732 # include "thread_linux_ppc.hpp"
1733 #endif
1734 #ifdef TARGET_OS_ARCH_aix_ppc
1735 # include "thread_aix_ppc.hpp"
1736 #endif
1737 #ifdef TARGET_OS_ARCH_bsd_x86
1738 # include "thread_bsd_x86.hpp"
1739 #endif
1740 #ifdef TARGET_OS_ARCH_bsd_zero
1741 # include "thread_bsd_zero.hpp"
1742 #endif
1745 public:
1746 void set_blocked_on_compilation(bool value) {
1747 _blocked_on_compilation = value;
1748 }
1750 bool blocked_on_compilation() {
1751 return _blocked_on_compilation;
1752 }
1753 protected:
1754 bool _blocked_on_compilation;
1757 // JSR166 per-thread parker
1758 private:
1759 Parker* _parker;
1760 public:
1761 Parker* parker() { return _parker; }
1763 // Biased locking support
1764 private:
1765 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1766 public:
1767 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1768 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1770 // clearing/querying jni attach status
1771 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1772 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1773 inline void set_done_attaching_via_jni();
1774 private:
1775 // This field is used to determine if a thread has claimed
1776 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1777 // otherwise its value is the par_id that has been claimed.
1778 uint _claimed_par_id;
1779 public:
1780 uint get_claimed_par_id() { return _claimed_par_id; }
1781 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1782 };
1784 // Inline implementation of JavaThread::current
1785 inline JavaThread* JavaThread::current() {
1786 Thread* thread = ThreadLocalStorage::thread();
1787 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1788 return (JavaThread*)thread;
1789 }
1791 inline CompilerThread* JavaThread::as_CompilerThread() {
1792 assert(is_Compiler_thread(), "just checking");
1793 return (CompilerThread*)this;
1794 }
1796 inline bool JavaThread::stack_guard_zone_unused() {
1797 return _stack_guard_state == stack_guard_unused;
1798 }
1800 inline bool JavaThread::stack_yellow_zone_disabled() {
1801 return _stack_guard_state == stack_guard_yellow_disabled;
1802 }
1804 inline bool JavaThread::stack_yellow_zone_enabled() {
1805 #ifdef ASSERT
1806 if (os::uses_stack_guard_pages() &&
1807 !(DisablePrimordialThreadGuardPages && os::is_primordial_thread())) {
1808 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1809 }
1810 #endif
1811 return _stack_guard_state == stack_guard_enabled;
1812 }
1814 inline size_t JavaThread::stack_available(address cur_sp) {
1815 // This code assumes java stacks grow down
1816 address low_addr; // Limit on the address for deepest stack depth
1817 if ( _stack_guard_state == stack_guard_unused) {
1818 low_addr = stack_base() - stack_size();
1819 } else {
1820 low_addr = stack_yellow_zone_base();
1821 }
1822 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1823 }
1825 // A thread used for Compilation.
1826 class CompilerThread : public JavaThread {
1827 friend class VMStructs;
1828 private:
1829 CompilerCounters* _counters;
1831 ciEnv* _env;
1832 CompileLog* _log;
1833 CompileTask* _task;
1834 CompileQueue* _queue;
1835 BufferBlob* _buffer_blob;
1837 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1838 AbstractCompiler* _compiler;
1840 public:
1842 static CompilerThread* current();
1844 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1846 bool is_Compiler_thread() const { return true; }
1847 // Hide this compiler thread from external view.
1848 bool is_hidden_from_external_view() const { return true; }
1850 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1851 AbstractCompiler* compiler() const { return _compiler; }
1853 CompileQueue* queue() const { return _queue; }
1854 CompilerCounters* counters() const { return _counters; }
1856 // Get/set the thread's compilation environment.
1857 ciEnv* env() { return _env; }
1858 void set_env(ciEnv* env) { _env = env; }
1860 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1861 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1863 // Get/set the thread's logging information
1864 CompileLog* log() { return _log; }
1865 void init_log(CompileLog* log) {
1866 // Set once, for good.
1867 assert(_log == NULL, "set only once");
1868 _log = log;
1869 }
1871 // GC support
1872 // Apply "f->do_oop" to all root oops in "this".
1873 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1874 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1876 #ifndef PRODUCT
1877 private:
1878 IdealGraphPrinter *_ideal_graph_printer;
1879 public:
1880 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1881 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1882 #endif
1884 // Get/set the thread's current task
1885 CompileTask* task() { return _task; }
1886 void set_task(CompileTask* task) { _task = task; }
1888 // Track the nmethod currently being scanned by the sweeper
1889 void set_scanned_nmethod(nmethod* nm) {
1890 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1891 _scanned_nmethod = nm;
1892 }
1893 };
1895 inline CompilerThread* CompilerThread::current() {
1896 return JavaThread::current()->as_CompilerThread();
1897 }
1900 // The active thread queue. It also keeps track of the current used
1901 // thread priorities.
1902 class Threads: AllStatic {
1903 friend class VMStructs;
1904 private:
1905 static JavaThread* _thread_list;
1906 static int _number_of_threads;
1907 static int _number_of_non_daemon_threads;
1908 static int _return_code;
1909 #ifdef ASSERT
1910 static bool _vm_complete;
1911 #endif
1913 public:
1914 // Thread management
1915 // force_daemon is a concession to JNI, where we may need to add a
1916 // thread to the thread list before allocating its thread object
1917 static void add(JavaThread* p, bool force_daemon = false);
1918 static void remove(JavaThread* p);
1919 static bool includes(JavaThread* p);
1920 static JavaThread* first() { return _thread_list; }
1921 static void threads_do(ThreadClosure* tc);
1923 // Initializes the vm and creates the vm thread
1924 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1925 static void convert_vm_init_libraries_to_agents();
1926 static void create_vm_init_libraries();
1927 static void create_vm_init_agents();
1928 static void shutdown_vm_agents();
1929 static bool destroy_vm();
1930 // Supported VM versions via JNI
1931 // Includes JNI_VERSION_1_1
1932 static jboolean is_supported_jni_version_including_1_1(jint version);
1933 // Does not include JNI_VERSION_1_1
1934 static jboolean is_supported_jni_version(jint version);
1936 // Garbage collection
1937 static void follow_other_roots(void f(oop*));
1939 // Apply "f->do_oop" to all root oops in all threads.
1940 // This version may only be called by sequential code.
1941 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1942 // This version may be called by sequential or parallel code.
1943 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1944 // This creates a list of GCTasks, one per thread.
1945 static void create_thread_roots_tasks(GCTaskQueue* q);
1946 // This creates a list of GCTasks, one per thread, for marking objects.
1947 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1949 // Apply "f->do_oop" to roots in all threads that
1950 // are part of compiled frames
1951 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1953 static void convert_hcode_pointers();
1954 static void restore_hcode_pointers();
1956 // Sweeper
1957 static void nmethods_do(CodeBlobClosure* cf);
1959 // RedefineClasses support
1960 static void metadata_do(void f(Metadata*));
1962 static void gc_epilogue();
1963 static void gc_prologue();
1964 #ifdef ASSERT
1965 static bool is_vm_complete() { return _vm_complete; }
1966 #endif
1968 // Verification
1969 static void verify();
1970 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1971 static void print(bool print_stacks, bool internal_format) {
1972 // this function is only used by debug.cpp
1973 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1974 }
1975 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1977 // Get Java threads that are waiting to enter a monitor. If doLock
1978 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1979 // VM needs to be at a safepoint.
1980 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1981 address monitor, bool doLock);
1983 // Get owning Java thread from the monitor's owner field. If doLock
1984 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1985 // VM needs to be at a safepoint.
1986 static JavaThread *owning_thread_from_monitor_owner(address owner,
1987 bool doLock);
1989 // Number of threads on the active threads list
1990 static int number_of_threads() { return _number_of_threads; }
1991 // Number of non-daemon threads on the active threads list
1992 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1994 // Deoptimizes all frames tied to marked nmethods
1995 static void deoptimized_wrt_marked_nmethods();
1997 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
1999 };
2002 // Thread iterator
2003 class ThreadClosure: public StackObj {
2004 public:
2005 virtual void do_thread(Thread* thread) = 0;
2006 };
2008 class SignalHandlerMark: public StackObj {
2009 private:
2010 Thread* _thread;
2011 public:
2012 SignalHandlerMark(Thread* t) {
2013 _thread = t;
2014 if (_thread) _thread->enter_signal_handler();
2015 }
2016 ~SignalHandlerMark() {
2017 if (_thread) _thread->leave_signal_handler();
2018 _thread = NULL;
2019 }
2020 };
2023 #endif // SHARE_VM_RUNTIME_THREAD_HPP