Sun, 03 Feb 2013 22:43:57 +0100
Merge
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 #define SHARE_VM_RUNTIME_THREAD_HPP
28 #include "memory/allocation.hpp"
29 #include "memory/threadLocalAllocBuffer.hpp"
30 #include "oops/oop.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvmtiExport.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/javaFrameAnchor.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/mutexLocker.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/osThread.hpp"
39 #include "runtime/park.hpp"
40 #include "runtime/safepoint.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "runtime/threadLocalStorage.hpp"
43 #include "runtime/unhandledOops.hpp"
45 #if INCLUDE_NMT
46 #include "services/memRecorder.hpp"
47 #endif // INCLUDE_NMT
49 #include "trace/tracing.hpp"
50 #include "utilities/exceptions.hpp"
51 #include "utilities/top.hpp"
52 #ifndef SERIALGC
53 #include "gc_implementation/g1/dirtyCardQueue.hpp"
54 #include "gc_implementation/g1/satbQueue.hpp"
55 #endif
56 #ifdef ZERO
57 #ifdef TARGET_ARCH_zero
58 # include "stack_zero.hpp"
59 #endif
60 #endif
62 class ThreadSafepointState;
63 class ThreadProfiler;
65 class JvmtiThreadState;
66 class JvmtiGetLoadedClassesClosure;
67 class ThreadStatistics;
68 class ConcurrentLocksDump;
69 class ParkEvent;
70 class Parker;
72 class ciEnv;
73 class CompileThread;
74 class CompileLog;
75 class CompileTask;
76 class CompileQueue;
77 class CompilerCounters;
78 class vframeArray;
80 class DeoptResourceMark;
81 class jvmtiDeferredLocalVariableSet;
83 class GCTaskQueue;
84 class ThreadClosure;
85 class IdealGraphPrinter;
87 class WorkerThread;
89 // Class hierarchy
90 // - Thread
91 // - NamedThread
92 // - VMThread
93 // - ConcurrentGCThread
94 // - WorkerThread
95 // - GangWorker
96 // - GCTaskThread
97 // - JavaThread
98 // - WatcherThread
100 class Thread: public ThreadShadow {
101 friend class VMStructs;
102 private:
103 // Exception handling
104 // (Note: _pending_exception and friends are in ThreadShadow)
105 //oop _pending_exception; // pending exception for current thread
106 // const char* _exception_file; // file information for exception (debugging only)
107 // int _exception_line; // line information for exception (debugging only)
108 protected:
109 // Support for forcing alignment of thread objects for biased locking
110 void* _real_malloc_address;
111 public:
112 void* operator new(size_t size) { return allocate(size, true); }
113 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) { return allocate(size, false); }
114 void operator delete(void* p);
116 protected:
117 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
118 private:
120 // ***************************************************************
121 // Suspend and resume support
122 // ***************************************************************
123 //
124 // VM suspend/resume no longer exists - it was once used for various
125 // things including safepoints but was deprecated and finally removed
126 // in Java 7. Because VM suspension was considered "internal" Java-level
127 // suspension was considered "external", and this legacy naming scheme
128 // remains.
129 //
130 // External suspend/resume requests come from JVM_SuspendThread,
131 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
132 // ResumeThread. External
133 // suspend requests cause _external_suspend to be set and external
134 // resume requests cause _external_suspend to be cleared.
135 // External suspend requests do not nest on top of other external
136 // suspend requests. The higher level APIs reject suspend requests
137 // for already suspended threads.
138 //
139 // The external_suspend
140 // flag is checked by has_special_runtime_exit_condition() and java thread
141 // will self-suspend when handle_special_runtime_exit_condition() is
142 // called. Most uses of the _thread_blocked state in JavaThreads are
143 // considered the same as being externally suspended; if the blocking
144 // condition lifts, the JavaThread will self-suspend. Other places
145 // where VM checks for external_suspend include:
146 // + mutex granting (do not enter monitors when thread is suspended)
147 // + state transitions from _thread_in_native
148 //
149 // In general, java_suspend() does not wait for an external suspend
150 // request to complete. When it returns, the only guarantee is that
151 // the _external_suspend field is true.
152 //
153 // wait_for_ext_suspend_completion() is used to wait for an external
154 // suspend request to complete. External suspend requests are usually
155 // followed by some other interface call that requires the thread to
156 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
157 // the interface that requires quiescence, we give the JavaThread a
158 // chance to self-suspend before we need it to be quiescent. This
159 // improves overall suspend/query performance.
160 //
161 // _suspend_flags controls the behavior of java_ suspend/resume.
162 // It must be set under the protection of SR_lock. Read from the flag is
163 // OK without SR_lock as long as the value is only used as a hint.
164 // (e.g., check _external_suspend first without lock and then recheck
165 // inside SR_lock and finish the suspension)
166 //
167 // _suspend_flags is also overloaded for other "special conditions" so
168 // that a single check indicates whether any special action is needed
169 // eg. for async exceptions.
170 // -------------------------------------------------------------------
171 // Notes:
172 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
173 // but we still update its value to keep other part of the system (mainly
174 // JVMTI) happy. ThreadState is legacy code (see notes in
175 // osThread.hpp).
176 //
177 // 2. It would be more natural if set_external_suspend() is private and
178 // part of java_suspend(), but that probably would affect the suspend/query
179 // performance. Need more investigation on this.
180 //
182 // suspend/resume lock: used for self-suspend
183 Monitor* _SR_lock;
185 protected:
186 enum SuspendFlags {
187 // NOTE: avoid using the sign-bit as cc generates different test code
188 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
190 _external_suspend = 0x20000000U, // thread is asked to self suspend
191 _ext_suspended = 0x40000000U, // thread has self-suspended
192 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
194 _has_async_exception = 0x00000001U, // there is a pending async exception
195 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
196 };
198 // various suspension related flags - atomically updated
199 // overloaded for async exception checking in check_special_condition_for_native_trans.
200 volatile uint32_t _suspend_flags;
202 private:
203 int _num_nested_signal;
205 public:
206 void enter_signal_handler() { _num_nested_signal++; }
207 void leave_signal_handler() { _num_nested_signal--; }
208 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
210 private:
211 // Debug tracing
212 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
214 // Active_handles points to a block of handles
215 JNIHandleBlock* _active_handles;
217 // One-element thread local free list
218 JNIHandleBlock* _free_handle_block;
220 // Point to the last handle mark
221 HandleMark* _last_handle_mark;
223 // The parity of the last strong_roots iteration in which this thread was
224 // claimed as a task.
225 jint _oops_do_parity;
227 public:
228 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
229 HandleMark* last_handle_mark() const { return _last_handle_mark; }
230 private:
232 // debug support for checking if code does allow safepoints or not
233 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
234 // mutex, or blocking on an object synchronizer (Java locking).
235 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
236 // If !allow_allocation(), then an assertion failure will happen during allocation
237 // (Hence, !allow_safepoint() => !allow_allocation()).
238 //
239 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
240 //
241 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
242 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
244 // Used by SkipGCALot class.
245 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
247 // Record when GC is locked out via the GC_locker mechanism
248 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
250 friend class No_Alloc_Verifier;
251 friend class No_Safepoint_Verifier;
252 friend class Pause_No_Safepoint_Verifier;
253 friend class ThreadLocalStorage;
254 friend class GC_locker;
256 ThreadLocalAllocBuffer _tlab; // Thread-local eden
257 jlong _allocated_bytes; // Cumulative number of bytes allocated on
258 // the Java heap
260 TRACE_BUFFER _trace_buffer; // Thread-local buffer for tracing
262 int _vm_operation_started_count; // VM_Operation support
263 int _vm_operation_completed_count; // VM_Operation support
265 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
266 // is waiting to lock
267 bool _current_pending_monitor_is_from_java; // locking is from Java code
269 // ObjectMonitor on which this thread called Object.wait()
270 ObjectMonitor* _current_waiting_monitor;
272 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
273 public:
274 ObjectMonitor* omFreeList;
275 int omFreeCount; // length of omFreeList
276 int omFreeProvision; // reload chunk size
277 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
278 int omInUseCount; // length of omInUseList
280 #ifdef ASSERT
281 private:
282 bool _visited_for_critical_count;
284 public:
285 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
286 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
287 #endif
289 public:
290 enum {
291 is_definitely_current_thread = true
292 };
294 // Constructor
295 Thread();
296 virtual ~Thread();
298 // initializtion
299 void initialize_thread_local_storage();
301 // thread entry point
302 virtual void run();
304 // Testers
305 virtual bool is_VM_thread() const { return false; }
306 virtual bool is_Java_thread() const { return false; }
307 virtual bool is_Compiler_thread() const { return false; }
308 virtual bool is_hidden_from_external_view() const { return false; }
309 virtual bool is_jvmti_agent_thread() const { return false; }
310 // True iff the thread can perform GC operations at a safepoint.
311 // Generally will be true only of VM thread and parallel GC WorkGang
312 // threads.
313 virtual bool is_GC_task_thread() const { return false; }
314 virtual bool is_Watcher_thread() const { return false; }
315 virtual bool is_ConcurrentGC_thread() const { return false; }
316 virtual bool is_Named_thread() const { return false; }
317 virtual bool is_Worker_thread() const { return false; }
319 // Casts
320 virtual WorkerThread* as_Worker_thread() const { return NULL; }
322 virtual char* name() const { return (char*)"Unknown thread"; }
324 // Returns the current thread
325 static inline Thread* current();
327 // Common thread operations
328 static void set_priority(Thread* thread, ThreadPriority priority);
329 static ThreadPriority get_priority(const Thread* const thread);
330 static void start(Thread* thread);
331 static void interrupt(Thread* thr);
332 static bool is_interrupted(Thread* thr, bool clear_interrupted);
334 void set_native_thread_name(const char *name) {
335 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
336 os::set_native_thread_name(name);
337 }
339 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
340 Monitor* SR_lock() const { return _SR_lock; }
342 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
344 void set_suspend_flag(SuspendFlags f) {
345 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
346 uint32_t flags;
347 do {
348 flags = _suspend_flags;
349 }
350 while (Atomic::cmpxchg((jint)(flags | f),
351 (volatile jint*)&_suspend_flags,
352 (jint)flags) != (jint)flags);
353 }
354 void clear_suspend_flag(SuspendFlags f) {
355 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
356 uint32_t flags;
357 do {
358 flags = _suspend_flags;
359 }
360 while (Atomic::cmpxchg((jint)(flags & ~f),
361 (volatile jint*)&_suspend_flags,
362 (jint)flags) != (jint)flags);
363 }
365 void set_has_async_exception() {
366 set_suspend_flag(_has_async_exception);
367 }
368 void clear_has_async_exception() {
369 clear_suspend_flag(_has_async_exception);
370 }
372 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
374 void set_critical_native_unlock() {
375 set_suspend_flag(_critical_native_unlock);
376 }
377 void clear_critical_native_unlock() {
378 clear_suspend_flag(_critical_native_unlock);
379 }
381 // Support for Unhandled Oop detection
382 #ifdef CHECK_UNHANDLED_OOPS
383 private:
384 UnhandledOops* _unhandled_oops;
385 public:
386 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
387 // Mark oop safe for gc. It may be stack allocated but won't move.
388 void allow_unhandled_oop(oop *op) {
389 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
390 }
391 // Clear oops at safepoint so crashes point to unhandled oop violator
392 void clear_unhandled_oops() {
393 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
394 }
395 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
396 #endif // CHECK_UNHANDLED_OOPS
398 #ifndef PRODUCT
399 bool skip_gcalot() { return _skip_gcalot; }
400 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
401 #endif
403 public:
404 // Installs a pending exception to be inserted later
405 static void send_async_exception(oop thread_oop, oop java_throwable);
407 // Resource area
408 ResourceArea* resource_area() const { return _resource_area; }
409 void set_resource_area(ResourceArea* area) { _resource_area = area; }
411 OSThread* osthread() const { return _osthread; }
412 void set_osthread(OSThread* thread) { _osthread = thread; }
414 // JNI handle support
415 JNIHandleBlock* active_handles() const { return _active_handles; }
416 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
417 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
418 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
420 // Internal handle support
421 HandleArea* handle_area() const { return _handle_area; }
422 void set_handle_area(HandleArea* area) { _handle_area = area; }
424 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
425 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
427 // Thread-Local Allocation Buffer (TLAB) support
428 ThreadLocalAllocBuffer& tlab() { return _tlab; }
429 void initialize_tlab() {
430 if (UseTLAB) {
431 tlab().initialize();
432 }
433 }
435 jlong allocated_bytes() { return _allocated_bytes; }
436 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
437 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
438 jlong cooked_allocated_bytes() {
439 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
440 if (UseTLAB) {
441 size_t used_bytes = tlab().used_bytes();
442 if ((ssize_t)used_bytes > 0) {
443 // More-or-less valid tlab. The load_acquire above should ensure
444 // that the result of the add is <= the instantaneous value
445 return allocated_bytes + used_bytes;
446 }
447 }
448 return allocated_bytes;
449 }
451 TRACE_BUFFER trace_buffer() { return _trace_buffer; }
452 void set_trace_buffer(TRACE_BUFFER buf) { _trace_buffer = buf; }
454 // VM operation support
455 int vm_operation_ticket() { return ++_vm_operation_started_count; }
456 int vm_operation_completed_count() { return _vm_operation_completed_count; }
457 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
459 // For tracking the heavyweight monitor the thread is pending on.
460 ObjectMonitor* current_pending_monitor() {
461 return _current_pending_monitor;
462 }
463 void set_current_pending_monitor(ObjectMonitor* monitor) {
464 _current_pending_monitor = monitor;
465 }
466 void set_current_pending_monitor_is_from_java(bool from_java) {
467 _current_pending_monitor_is_from_java = from_java;
468 }
469 bool current_pending_monitor_is_from_java() {
470 return _current_pending_monitor_is_from_java;
471 }
473 // For tracking the ObjectMonitor on which this thread called Object.wait()
474 ObjectMonitor* current_waiting_monitor() {
475 return _current_waiting_monitor;
476 }
477 void set_current_waiting_monitor(ObjectMonitor* monitor) {
478 _current_waiting_monitor = monitor;
479 }
481 // GC support
482 // Apply "f->do_oop" to all root oops in "this".
483 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
484 // Used by JavaThread::oops_do.
485 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
486 virtual void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
488 // Handles the parallel case for the method below.
489 private:
490 bool claim_oops_do_par_case(int collection_parity);
491 public:
492 // Requires that "collection_parity" is that of the current strong roots
493 // iteration. If "is_par" is false, sets the parity of "this" to
494 // "collection_parity", and returns "true". If "is_par" is true,
495 // uses an atomic instruction to set the current threads parity to
496 // "collection_parity", if it is not already. Returns "true" iff the
497 // calling thread does the update, this indicates that the calling thread
498 // has claimed the thread's stack as a root groop in the current
499 // collection.
500 bool claim_oops_do(bool is_par, int collection_parity) {
501 if (!is_par) {
502 _oops_do_parity = collection_parity;
503 return true;
504 } else {
505 return claim_oops_do_par_case(collection_parity);
506 }
507 }
509 // Sweeper support
510 void nmethods_do(CodeBlobClosure* cf);
512 // jvmtiRedefineClasses support
513 void metadata_do(void f(Metadata*));
515 // Used by fast lock support
516 virtual bool is_lock_owned(address adr) const;
518 // Check if address is in the stack of the thread (not just for locks).
519 // Warning: the method can only be used on the running thread
520 bool is_in_stack(address adr) const;
522 // Sets this thread as starting thread. Returns failure if thread
523 // creation fails due to lack of memory, too many threads etc.
524 bool set_as_starting_thread();
526 protected:
527 // OS data associated with the thread
528 OSThread* _osthread; // Platform-specific thread information
530 // Thread local resource area for temporary allocation within the VM
531 ResourceArea* _resource_area;
533 // Thread local handle area for allocation of handles within the VM
534 HandleArea* _handle_area;
535 GrowableArray<Metadata*>* _metadata_handles;
537 // Support for stack overflow handling, get_thread, etc.
538 address _stack_base;
539 size_t _stack_size;
540 uintptr_t _self_raw_id; // used by get_thread (mutable)
541 int _lgrp_id;
543 public:
544 // Stack overflow support
545 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
547 void set_stack_base(address base) { _stack_base = base; }
548 size_t stack_size() const { return _stack_size; }
549 void set_stack_size(size_t size) { _stack_size = size; }
550 void record_stack_base_and_size();
552 bool on_local_stack(address adr) const {
553 /* QQQ this has knowledge of direction, ought to be a stack method */
554 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
555 }
557 uintptr_t self_raw_id() { return _self_raw_id; }
558 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
560 int lgrp_id() const { return _lgrp_id; }
561 void set_lgrp_id(int value) { _lgrp_id = value; }
563 // Printing
564 void print_on(outputStream* st) const;
565 void print() const { print_on(tty); }
566 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
568 // Debug-only code
569 #ifdef ASSERT
570 private:
571 // Deadlock detection support for Mutex locks. List of locks own by thread.
572 Monitor* _owned_locks;
573 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
574 // thus the friendship
575 friend class Mutex;
576 friend class Monitor;
578 public:
579 void print_owned_locks_on(outputStream* st) const;
580 void print_owned_locks() const { print_owned_locks_on(tty); }
581 Monitor* owned_locks() const { return _owned_locks; }
582 bool owns_locks() const { return owned_locks() != NULL; }
583 bool owns_locks_but_compiled_lock() const;
585 // Deadlock detection
586 bool allow_allocation() { return _allow_allocation_count == 0; }
587 #endif
589 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
591 private:
592 volatile int _jvmti_env_iteration_count;
594 public:
595 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
596 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
597 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
599 // Code generation
600 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
601 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
602 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
604 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
605 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
607 #define TLAB_FIELD_OFFSET(name) \
608 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
610 TLAB_FIELD_OFFSET(start)
611 TLAB_FIELD_OFFSET(end)
612 TLAB_FIELD_OFFSET(top)
613 TLAB_FIELD_OFFSET(pf_top)
614 TLAB_FIELD_OFFSET(size) // desired_size
615 TLAB_FIELD_OFFSET(refill_waste_limit)
616 TLAB_FIELD_OFFSET(number_of_refills)
617 TLAB_FIELD_OFFSET(fast_refill_waste)
618 TLAB_FIELD_OFFSET(slow_allocations)
620 #undef TLAB_FIELD_OFFSET
622 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
624 public:
625 volatile intptr_t _Stalled ;
626 volatile int _TypeTag ;
627 ParkEvent * _ParkEvent ; // for synchronized()
628 ParkEvent * _SleepEvent ; // for Thread.sleep
629 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
630 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
631 int NativeSyncRecursion ; // diagnostic
633 volatile int _OnTrap ; // Resume-at IP delta
634 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
635 jint _hashStateX ; // thread-specific hashCode generator state
636 jint _hashStateY ;
637 jint _hashStateZ ;
638 void * _schedctl ;
640 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code
641 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); }
642 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); }
644 volatile jint rng [4] ; // RNG for spin loop
646 // Low-level leaf-lock primitives used to implement synchronization
647 // and native monitor-mutex infrastructure.
648 // Not for general synchronization use.
649 static void SpinAcquire (volatile int * Lock, const char * Name) ;
650 static void SpinRelease (volatile int * Lock) ;
651 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
652 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
653 static void muxRelease (volatile intptr_t * Lock) ;
654 };
656 // Inline implementation of Thread::current()
657 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
658 // startup.
659 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
660 // period. This is inlined in thread_<os_family>.inline.hpp.
662 inline Thread* Thread::current() {
663 #ifdef ASSERT
664 // This function is very high traffic. Define PARANOID to enable expensive
665 // asserts.
666 #ifdef PARANOID
667 // Signal handler should call ThreadLocalStorage::get_thread_slow()
668 Thread* t = ThreadLocalStorage::get_thread_slow();
669 assert(t != NULL && !t->is_inside_signal_handler(),
670 "Don't use Thread::current() inside signal handler");
671 #endif
672 #endif
673 Thread* thread = ThreadLocalStorage::thread();
674 assert(thread != NULL, "just checking");
675 return thread;
676 }
678 // Name support for threads. non-JavaThread subclasses with multiple
679 // uniquely named instances should derive from this.
680 class NamedThread: public Thread {
681 friend class VMStructs;
682 enum {
683 max_name_len = 64
684 };
685 private:
686 char* _name;
687 // log JavaThread being processed by oops_do
688 JavaThread* _processed_thread;
690 public:
691 NamedThread();
692 ~NamedThread();
693 // May only be called once per thread.
694 void set_name(const char* format, ...);
695 virtual bool is_Named_thread() const { return true; }
696 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
697 JavaThread *processed_thread() { return _processed_thread; }
698 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
699 };
701 // Worker threads are named and have an id of an assigned work.
702 class WorkerThread: public NamedThread {
703 private:
704 uint _id;
705 public:
706 WorkerThread() : _id(0) { }
707 virtual bool is_Worker_thread() const { return true; }
709 virtual WorkerThread* as_Worker_thread() const {
710 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
711 return (WorkerThread*) this;
712 }
714 void set_id(uint work_id) { _id = work_id; }
715 uint id() const { return _id; }
716 };
718 // A single WatcherThread is used for simulating timer interrupts.
719 class WatcherThread: public Thread {
720 friend class VMStructs;
721 public:
722 virtual void run();
724 private:
725 static WatcherThread* _watcher_thread;
727 static bool _startable;
728 volatile static bool _should_terminate; // updated without holding lock
729 public:
730 enum SomeConstants {
731 delay_interval = 10 // interrupt delay in milliseconds
732 };
734 // Constructor
735 WatcherThread();
737 // Tester
738 bool is_Watcher_thread() const { return true; }
740 // Printing
741 char* name() const { return (char*)"VM Periodic Task Thread"; }
742 void print_on(outputStream* st) const;
743 void print() const { print_on(tty); }
744 void unpark();
746 // Returns the single instance of WatcherThread
747 static WatcherThread* watcher_thread() { return _watcher_thread; }
749 // Create and start the single instance of WatcherThread, or stop it on shutdown
750 static void start();
751 static void stop();
752 // Only allow start once the VM is sufficiently initialized
753 // Otherwise the first task to enroll will trigger the start
754 static void make_startable();
756 private:
757 int sleep() const;
758 };
761 class CompilerThread;
763 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
765 class JavaThread: public Thread {
766 friend class VMStructs;
767 private:
768 JavaThread* _next; // The next thread in the Threads list
769 oop _threadObj; // The Java level thread object
771 #ifdef ASSERT
772 private:
773 int _java_call_counter;
775 public:
776 int java_call_counter() { return _java_call_counter; }
777 void inc_java_call_counter() { _java_call_counter++; }
778 void dec_java_call_counter() {
779 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
780 _java_call_counter--;
781 }
782 private: // restore original namespace restriction
783 #endif // ifdef ASSERT
785 #ifndef PRODUCT
786 public:
787 enum {
788 jump_ring_buffer_size = 16
789 };
790 private: // restore original namespace restriction
791 #endif
793 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
795 ThreadFunction _entry_point;
797 JNIEnv _jni_environment;
799 // Deopt support
800 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
802 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
803 // transition out of native
804 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
805 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
806 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
807 // Because deoptimization is lazy we must save jvmti requests to set locals
808 // in compiled frames until we deoptimize and we have an interpreter frame.
809 // This holds the pointer to array (yeah like there might be more than one) of
810 // description of compiled vframes that have locals that need to be updated.
811 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
813 // Handshake value for fixing 6243940. We need a place for the i2c
814 // adapter to store the callee Method*. This value is NEVER live
815 // across a gc point so it does NOT have to be gc'd
816 // The handshake is open ended since we can't be certain that it will
817 // be NULLed. This is because we rarely ever see the race and end up
818 // in handle_wrong_method which is the backend of the handshake. See
819 // code in i2c adapters and handle_wrong_method.
821 Method* _callee_target;
823 // Used to pass back results to the interpreter or generated code running Java code.
824 oop _vm_result; // oop result is GC-preserved
825 Metadata* _vm_result_2; // non-oop result
827 // See ReduceInitialCardMarks: this holds the precise space interval of
828 // the most recent slow path allocation for which compiled code has
829 // elided card-marks for performance along the fast-path.
830 MemRegion _deferred_card_mark;
832 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
833 // allocated during deoptimization
834 // and by JNI_MonitorEnter/Exit
836 // Async. requests support
837 enum AsyncRequests {
838 _no_async_condition = 0,
839 _async_exception,
840 _async_unsafe_access_error
841 };
842 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
843 oop _pending_async_exception;
845 // Safepoint support
846 public: // Expose _thread_state for SafeFetchInt()
847 volatile JavaThreadState _thread_state;
848 private:
849 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
850 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
852 // JavaThread termination support
853 enum TerminatedTypes {
854 _not_terminated = 0xDEAD - 2,
855 _thread_exiting, // JavaThread::exit() has been called for this thread
856 _thread_terminated, // JavaThread is removed from thread list
857 _vm_exited // JavaThread is still executing native code, but VM is terminated
858 // only VM_Exit can set _vm_exited
859 };
861 // In general a JavaThread's _terminated field transitions as follows:
862 //
863 // _not_terminated => _thread_exiting => _thread_terminated
864 //
865 // _vm_exited is a special value to cover the case of a JavaThread
866 // executing native code after the VM itself is terminated.
867 volatile TerminatedTypes _terminated;
868 // suspend/resume support
869 volatile bool _suspend_equivalent; // Suspend equivalent condition
870 jint _in_deopt_handler; // count of deoptimization
871 // handlers thread is in
872 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
873 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
874 // never locked) when throwing an exception. Used by interpreter only.
876 // JNI attach states:
877 enum JNIAttachStates {
878 _not_attaching_via_jni = 1, // thread is not attaching via JNI
879 _attaching_via_jni, // thread is attaching via JNI
880 _attached_via_jni // thread has attached via JNI
881 };
883 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
884 // A native thread that is attaching via JNI starts with a value
885 // of _attaching_via_jni and transitions to _attached_via_jni.
886 volatile JNIAttachStates _jni_attach_state;
888 public:
889 // State of the stack guard pages for this thread.
890 enum StackGuardState {
891 stack_guard_unused, // not needed
892 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
893 stack_guard_enabled // enabled
894 };
896 private:
898 StackGuardState _stack_guard_state;
900 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
901 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
902 // code)
903 volatile oop _exception_oop; // Exception thrown in compiled code
904 volatile address _exception_pc; // PC where exception happened
905 volatile address _exception_handler_pc; // PC for handler of exception
906 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
908 // support for compilation
909 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
911 // support for JNI critical regions
912 jint _jni_active_critical; // count of entries into JNI critical region
914 // For deadlock detection.
915 int _depth_first_number;
917 // JVMTI PopFrame support
918 // This is set to popframe_pending to signal that top Java frame should be popped immediately
919 int _popframe_condition;
921 #ifndef PRODUCT
922 int _jmp_ring_index;
923 struct {
924 // We use intptr_t instead of address so debugger doesn't try and display strings
925 intptr_t _target;
926 intptr_t _instruction;
927 const char* _file;
928 int _line;
929 } _jmp_ring[ jump_ring_buffer_size ];
930 #endif /* PRODUCT */
932 #ifndef SERIALGC
933 // Support for G1 barriers
935 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
936 // Set of all such queues.
937 static SATBMarkQueueSet _satb_mark_queue_set;
939 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
940 // Set of all such queues.
941 static DirtyCardQueueSet _dirty_card_queue_set;
943 void flush_barrier_queues();
944 #endif // !SERIALGC
946 friend class VMThread;
947 friend class ThreadWaitTransition;
948 friend class VM_Exit;
950 void initialize(); // Initialized the instance variables
952 public:
953 // Constructor
954 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
955 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
956 ~JavaThread();
958 #ifdef ASSERT
959 // verify this JavaThread hasn't be published in the Threads::list yet
960 void verify_not_published();
961 #endif
963 //JNI functiontable getter/setter for JVMTI jni function table interception API.
964 void set_jni_functions(struct JNINativeInterface_* functionTable) {
965 _jni_environment.functions = functionTable;
966 }
967 struct JNINativeInterface_* get_jni_functions() {
968 return (struct JNINativeInterface_ *)_jni_environment.functions;
969 }
971 // This function is called at thread creation to allow
972 // platform specific thread variables to be initialized.
973 void cache_global_variables();
975 // Executes Shutdown.shutdown()
976 void invoke_shutdown_hooks();
978 // Cleanup on thread exit
979 enum ExitType {
980 normal_exit,
981 jni_detach
982 };
983 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
985 void cleanup_failed_attach_current_thread();
987 // Testers
988 virtual bool is_Java_thread() const { return true; }
990 // compilation
991 void set_is_compiling(bool f) { _is_compiling = f; }
992 bool is_compiling() const { return _is_compiling; }
994 // Thread chain operations
995 JavaThread* next() const { return _next; }
996 void set_next(JavaThread* p) { _next = p; }
998 // Thread oop. threadObj() can be NULL for initial JavaThread
999 // (or for threads attached via JNI)
1000 oop threadObj() const { return _threadObj; }
1001 void set_threadObj(oop p) { _threadObj = p; }
1003 ThreadPriority java_priority() const; // Read from threadObj()
1005 // Prepare thread and add to priority queue. If a priority is
1006 // not specified, use the priority of the thread object. Threads_lock
1007 // must be held while this function is called.
1008 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1010 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1011 address saved_exception_pc() { return _saved_exception_pc; }
1014 ThreadFunction entry_point() const { return _entry_point; }
1016 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1017 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1019 // Last frame anchor routines
1021 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1023 // last_Java_sp
1024 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1025 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1027 // last_Java_pc
1029 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1031 // Safepoint support
1032 JavaThreadState thread_state() const { return _thread_state; }
1033 void set_thread_state(JavaThreadState s) { _thread_state=s; }
1034 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1035 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1036 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1038 // thread has called JavaThread::exit() or is terminated
1039 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1040 // thread is terminated (no longer on the threads list); we compare
1041 // against the two non-terminated values so that a freed JavaThread
1042 // will also be considered terminated.
1043 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1044 void set_terminated(TerminatedTypes t) { _terminated = t; }
1045 // special for Threads::remove() which is static:
1046 void set_terminated_value() { _terminated = _thread_terminated; }
1047 void block_if_vm_exited();
1049 bool doing_unsafe_access() { return _doing_unsafe_access; }
1050 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1052 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1053 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1055 #if INCLUDE_NMT
1056 // native memory tracking
1057 inline MemRecorder* get_recorder() const { return (MemRecorder*)_recorder; }
1058 inline void set_recorder(MemRecorder* rc) { _recorder = (volatile MemRecorder*)rc; }
1060 private:
1061 // per-thread memory recorder
1062 volatile MemRecorder* _recorder;
1063 #endif // INCLUDE_NMT
1065 // Suspend/resume support for JavaThread
1066 private:
1067 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1068 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1070 public:
1071 void java_suspend();
1072 void java_resume();
1073 int java_suspend_self();
1075 void check_and_wait_while_suspended() {
1076 assert(JavaThread::current() == this, "sanity check");
1078 bool do_self_suspend;
1079 do {
1080 // were we externally suspended while we were waiting?
1081 do_self_suspend = handle_special_suspend_equivalent_condition();
1082 if (do_self_suspend) {
1083 // don't surprise the thread that suspended us by returning
1084 java_suspend_self();
1085 set_suspend_equivalent();
1086 }
1087 } while (do_self_suspend);
1088 }
1089 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1090 // Check for async exception in addition to safepoint and suspend request.
1091 static void check_special_condition_for_native_trans(JavaThread *thread);
1093 // Same as check_special_condition_for_native_trans but finishes the
1094 // transition into thread_in_Java mode so that it can potentially
1095 // block.
1096 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1098 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1099 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1100 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1101 // Warning: is_ext_suspend_completed() may temporarily drop the
1102 // SR_lock to allow the thread to reach a stable thread state if
1103 // it is currently in a transient thread state.
1104 return is_ext_suspend_completed(false /*!called_by_wait */,
1105 SuspendRetryDelay, bits);
1106 }
1108 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1109 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1110 // passed as the count and delay parameters. Experiments with specific
1111 // calls to wait_for_ext_suspend_completion() can be done by passing
1112 // other values in the code. Experiments with all calls can be done
1113 // via the appropriate -XX options.
1114 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1116 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1117 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1119 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1120 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1121 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1123 bool is_external_suspend() const {
1124 return (_suspend_flags & _external_suspend) != 0;
1125 }
1126 // Whenever a thread transitions from native to vm/java it must suspend
1127 // if external|deopt suspend is present.
1128 bool is_suspend_after_native() const {
1129 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1130 }
1132 // external suspend request is completed
1133 bool is_ext_suspended() const {
1134 return (_suspend_flags & _ext_suspended) != 0;
1135 }
1137 bool is_external_suspend_with_lock() const {
1138 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1139 return is_external_suspend();
1140 }
1142 // Special method to handle a pending external suspend request
1143 // when a suspend equivalent condition lifts.
1144 bool handle_special_suspend_equivalent_condition() {
1145 assert(is_suspend_equivalent(),
1146 "should only be called in a suspend equivalence condition");
1147 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1148 bool ret = is_external_suspend();
1149 if (!ret) {
1150 // not about to self-suspend so clear suspend equivalence
1151 clear_suspend_equivalent();
1152 }
1153 // implied else:
1154 // We have a pending external suspend request so we leave the
1155 // suspend_equivalent flag set until java_suspend_self() sets
1156 // the ext_suspended flag and clears the suspend_equivalent
1157 // flag. This insures that wait_for_ext_suspend_completion()
1158 // will return consistent values.
1159 return ret;
1160 }
1162 // utility methods to see if we are doing some kind of suspension
1163 bool is_being_ext_suspended() const {
1164 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1165 return is_ext_suspended() || is_external_suspend();
1166 }
1168 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1170 void set_suspend_equivalent() { _suspend_equivalent = true; };
1171 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1173 // Thread.stop support
1174 void send_thread_stop(oop throwable);
1175 AsyncRequests clear_special_runtime_exit_condition() {
1176 AsyncRequests x = _special_runtime_exit_condition;
1177 _special_runtime_exit_condition = _no_async_condition;
1178 return x;
1179 }
1181 // Are any async conditions present?
1182 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1184 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1186 // these next two are also used for self-suspension and async exception support
1187 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1189 // Return true if JavaThread has an asynchronous condition or
1190 // if external suspension is requested.
1191 bool has_special_runtime_exit_condition() {
1192 // We call is_external_suspend() last since external suspend should
1193 // be less common. Because we don't use is_external_suspend_with_lock
1194 // it is possible that we won't see an asynchronous external suspend
1195 // request that has just gotten started, i.e., SR_lock grabbed but
1196 // _external_suspend field change either not made yet or not visible
1197 // yet. However, this is okay because the request is asynchronous and
1198 // we will see the new flag value the next time through. It's also
1199 // possible that the external suspend request is dropped after
1200 // we have checked is_external_suspend(), we will recheck its value
1201 // under SR_lock in java_suspend_self().
1202 return (_special_runtime_exit_condition != _no_async_condition) ||
1203 is_external_suspend() || is_deopt_suspend();
1204 }
1206 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1208 void set_pending_async_exception(oop e) {
1209 _pending_async_exception = e;
1210 _special_runtime_exit_condition = _async_exception;
1211 set_has_async_exception();
1212 }
1214 // Fast-locking support
1215 bool is_lock_owned(address adr) const;
1217 // Accessors for vframe array top
1218 // The linked list of vframe arrays are sorted on sp. This means when we
1219 // unpack the head must contain the vframe array to unpack.
1220 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1221 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1223 // Side structure for defering update of java frame locals until deopt occurs
1224 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1225 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1227 // These only really exist to make debugging deopt problems simpler
1229 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1230 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1232 // The special resourceMark used during deoptimization
1234 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1235 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1237 intptr_t* must_deopt_id() { return _must_deopt_id; }
1238 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1239 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1241 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1242 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1244 Method* callee_target() const { return _callee_target; }
1245 void set_callee_target (Method* x) { _callee_target = x; }
1247 // Oop results of vm runtime calls
1248 oop vm_result() const { return _vm_result; }
1249 void set_vm_result (oop x) { _vm_result = x; }
1251 Metadata* vm_result_2() const { return _vm_result_2; }
1252 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1254 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1255 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1257 // Exception handling for compiled methods
1258 oop exception_oop() const { return _exception_oop; }
1259 address exception_pc() const { return _exception_pc; }
1260 address exception_handler_pc() const { return _exception_handler_pc; }
1261 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1263 void set_exception_oop(oop o) { _exception_oop = o; }
1264 void set_exception_pc(address a) { _exception_pc = a; }
1265 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1266 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1268 // Stack overflow support
1269 inline size_t stack_available(address cur_sp);
1270 address stack_yellow_zone_base()
1271 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1272 size_t stack_yellow_zone_size()
1273 { return StackYellowPages * os::vm_page_size(); }
1274 address stack_red_zone_base()
1275 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1276 size_t stack_red_zone_size()
1277 { return StackRedPages * os::vm_page_size(); }
1278 bool in_stack_yellow_zone(address a)
1279 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1280 bool in_stack_red_zone(address a)
1281 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1283 void create_stack_guard_pages();
1284 void remove_stack_guard_pages();
1286 void enable_stack_yellow_zone();
1287 void disable_stack_yellow_zone();
1288 void enable_stack_red_zone();
1289 void disable_stack_red_zone();
1291 inline bool stack_yellow_zone_disabled();
1292 inline bool stack_yellow_zone_enabled();
1294 // Attempt to reguard the stack after a stack overflow may have occurred.
1295 // Returns true if (a) guard pages are not needed on this thread, (b) the
1296 // pages are already guarded, or (c) the pages were successfully reguarded.
1297 // Returns false if there is not enough stack space to reguard the pages, in
1298 // which case the caller should unwind a frame and try again. The argument
1299 // should be the caller's (approximate) sp.
1300 bool reguard_stack(address cur_sp);
1301 // Similar to above but see if current stackpoint is out of the guard area
1302 // and reguard if possible.
1303 bool reguard_stack(void);
1305 // Misc. accessors/mutators
1306 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1307 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1308 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1310 #ifndef PRODUCT
1311 void record_jump(address target, address instr, const char* file, int line);
1312 #endif /* PRODUCT */
1314 // For assembly stub generation
1315 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1316 #ifndef PRODUCT
1317 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1318 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1319 #endif /* PRODUCT */
1320 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1321 static ByteSize last_Java_sp_offset() {
1322 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1323 }
1324 static ByteSize last_Java_pc_offset() {
1325 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1326 }
1327 static ByteSize frame_anchor_offset() {
1328 return byte_offset_of(JavaThread, _anchor);
1329 }
1330 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1331 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1332 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1333 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1334 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1335 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1336 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1337 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1338 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1339 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1340 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1341 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1343 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1344 static ByteSize should_post_on_exceptions_flag_offset() {
1345 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1346 }
1348 #ifndef SERIALGC
1349 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1350 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1351 #endif // !SERIALGC
1353 // Returns the jni environment for this thread
1354 JNIEnv* jni_environment() { return &_jni_environment; }
1356 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1357 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1358 // Only return NULL if thread is off the thread list; starting to
1359 // exit should not return NULL.
1360 if (thread_from_jni_env->is_terminated()) {
1361 thread_from_jni_env->block_if_vm_exited();
1362 return NULL;
1363 } else {
1364 return thread_from_jni_env;
1365 }
1366 }
1368 // JNI critical regions. These can nest.
1369 bool in_critical() { return _jni_active_critical > 0; }
1370 bool in_last_critical() { return _jni_active_critical == 1; }
1371 void enter_critical() { assert(Thread::current() == this ||
1372 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1373 "this must be current thread or synchronizing");
1374 _jni_active_critical++; }
1375 void exit_critical() { assert(Thread::current() == this,
1376 "this must be current thread");
1377 _jni_active_critical--;
1378 assert(_jni_active_critical >= 0,
1379 "JNI critical nesting problem?"); }
1381 // For deadlock detection
1382 int depth_first_number() { return _depth_first_number; }
1383 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1385 private:
1386 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1388 public:
1389 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1390 void add_monitor_chunk(MonitorChunk* chunk);
1391 void remove_monitor_chunk(MonitorChunk* chunk);
1392 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1393 void inc_in_deopt_handler() { _in_deopt_handler++; }
1394 void dec_in_deopt_handler() {
1395 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1396 if (_in_deopt_handler > 0) { // robustness
1397 _in_deopt_handler--;
1398 }
1399 }
1401 private:
1402 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1404 public:
1406 // Frame iteration; calls the function f for all frames on the stack
1407 void frames_do(void f(frame*, const RegisterMap*));
1409 // Memory operations
1410 void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1412 // Sweeper operations
1413 void nmethods_do(CodeBlobClosure* cf);
1415 // RedefineClasses Support
1416 void metadata_do(void f(Metadata*));
1418 // Memory management operations
1419 void gc_epilogue();
1420 void gc_prologue();
1422 // Misc. operations
1423 char* name() const { return (char*)get_thread_name(); }
1424 void print_on(outputStream* st) const;
1425 void print() const { print_on(tty); }
1426 void print_value();
1427 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1428 void print_thread_state() const PRODUCT_RETURN;
1429 void print_on_error(outputStream* st, char* buf, int buflen) const;
1430 void verify();
1431 const char* get_thread_name() const;
1432 private:
1433 // factor out low-level mechanics for use in both normal and error cases
1434 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1435 public:
1436 const char* get_threadgroup_name() const;
1437 const char* get_parent_name() const;
1439 // Accessing frames
1440 frame last_frame() {
1441 _anchor.make_walkable(this);
1442 return pd_last_frame();
1443 }
1444 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1446 // Returns method at 'depth' java or native frames down the stack
1447 // Used for security checks
1448 Klass* security_get_caller_class(int depth);
1450 // Print stack trace in external format
1451 void print_stack_on(outputStream* st);
1452 void print_stack() { print_stack_on(tty); }
1454 // Print stack traces in various internal formats
1455 void trace_stack() PRODUCT_RETURN;
1456 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1457 void trace_frames() PRODUCT_RETURN;
1458 void trace_oops() PRODUCT_RETURN;
1460 // Print an annotated view of the stack frames
1461 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1462 void validate_frame_layout() {
1463 print_frame_layout(0, true);
1464 }
1466 // Returns the number of stack frames on the stack
1467 int depth() const;
1469 // Function for testing deoptimization
1470 void deoptimize();
1471 void make_zombies();
1473 void deoptimized_wrt_marked_nmethods();
1475 // Profiling operation (see fprofile.cpp)
1476 public:
1477 bool profile_last_Java_frame(frame* fr);
1479 private:
1480 ThreadProfiler* _thread_profiler;
1481 private:
1482 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1483 friend class FlatProfilerTask; // uses get_thread_profiler.
1484 friend class ThreadProfilerMark; // uses get_thread_profiler.
1485 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1486 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1487 ThreadProfiler* result = _thread_profiler;
1488 _thread_profiler = tp;
1489 return result;
1490 }
1492 // NMT (Native memory tracking) support.
1493 // This flag helps NMT to determine if this JavaThread will be blocked
1494 // at safepoint. If not, ThreadCritical is needed for writing memory records.
1495 // JavaThread is only safepoint visible when it is in Threads' thread list,
1496 // it is not visible until it is added to the list and becomes invisible
1497 // once it is removed from the list.
1498 public:
1499 bool is_safepoint_visible() const { return _safepoint_visible; }
1500 void set_safepoint_visible(bool visible) { _safepoint_visible = visible; }
1501 private:
1502 bool _safepoint_visible;
1504 // Static operations
1505 public:
1506 // Returns the running thread as a JavaThread
1507 static inline JavaThread* current();
1509 // Returns the active Java thread. Do not use this if you know you are calling
1510 // from a JavaThread, as it's slower than JavaThread::current. If called from
1511 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1512 // operation. You may not want that either.
1513 static JavaThread* active();
1515 inline CompilerThread* as_CompilerThread();
1517 public:
1518 virtual void run();
1519 void thread_main_inner();
1521 private:
1522 // PRIVILEGED STACK
1523 PrivilegedElement* _privileged_stack_top;
1524 GrowableArray<oop>* _array_for_gc;
1525 public:
1527 // Returns the privileged_stack information.
1528 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1529 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1530 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1532 public:
1533 // Thread local information maintained by JVMTI.
1534 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1535 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1536 // getter is used to get this JavaThread's JvmtiThreadState if it has
1537 // one which means NULL can be returned. JvmtiThreadState::state_for()
1538 // is used to get the specified JavaThread's JvmtiThreadState if it has
1539 // one or it allocates a new JvmtiThreadState for the JavaThread and
1540 // returns it. JvmtiThreadState::state_for() will return NULL only if
1541 // the specified JavaThread is exiting.
1542 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1543 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1544 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1545 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1547 // JVMTI PopFrame support
1548 // Setting and clearing popframe_condition
1549 // All of these enumerated values are bits. popframe_pending
1550 // indicates that a PopFrame() has been requested and not yet been
1551 // completed. popframe_processing indicates that that PopFrame() is in
1552 // the process of being completed. popframe_force_deopt_reexecution_bit
1553 // indicates that special handling is required when returning to a
1554 // deoptimized caller.
1555 enum PopCondition {
1556 popframe_inactive = 0x00,
1557 popframe_pending_bit = 0x01,
1558 popframe_processing_bit = 0x02,
1559 popframe_force_deopt_reexecution_bit = 0x04
1560 };
1561 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1562 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1563 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1564 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1565 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1566 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1567 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1568 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1569 #ifdef CC_INTERP
1570 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1571 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1572 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1573 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1574 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1575 #endif
1577 private:
1578 // Saved incoming arguments to popped frame.
1579 // Used only when popped interpreted frame returns to deoptimized frame.
1580 void* _popframe_preserved_args;
1581 int _popframe_preserved_args_size;
1583 public:
1584 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1585 void* popframe_preserved_args();
1586 ByteSize popframe_preserved_args_size();
1587 WordSize popframe_preserved_args_size_in_words();
1588 void popframe_free_preserved_args();
1591 private:
1592 JvmtiThreadState *_jvmti_thread_state;
1593 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1595 // Used by the interpreter in fullspeed mode for frame pop, method
1596 // entry, method exit and single stepping support. This field is
1597 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1598 // It can be set to zero asynchronously (i.e., without a VM operation
1599 // or a lock) so we have to be very careful.
1600 int _interp_only_mode;
1602 public:
1603 // used by the interpreter for fullspeed debugging support (see above)
1604 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1605 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1606 int get_interp_only_mode() { return _interp_only_mode; }
1607 void increment_interp_only_mode() { ++_interp_only_mode; }
1608 void decrement_interp_only_mode() { --_interp_only_mode; }
1610 // support for cached flag that indicates whether exceptions need to be posted for this thread
1611 // if this is false, we can avoid deoptimizing when events are thrown
1612 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1613 private:
1614 int _should_post_on_exceptions_flag;
1616 public:
1617 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1618 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1620 private:
1621 ThreadStatistics *_thread_stat;
1623 public:
1624 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1626 // Return a blocker object for which this thread is blocked parking.
1627 oop current_park_blocker();
1629 private:
1630 static size_t _stack_size_at_create;
1632 public:
1633 static inline size_t stack_size_at_create(void) {
1634 return _stack_size_at_create;
1635 }
1636 static inline void set_stack_size_at_create(size_t value) {
1637 _stack_size_at_create = value;
1638 }
1640 #ifndef SERIALGC
1641 // SATB marking queue support
1642 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1643 static SATBMarkQueueSet& satb_mark_queue_set() {
1644 return _satb_mark_queue_set;
1645 }
1647 // Dirty card queue support
1648 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1649 static DirtyCardQueueSet& dirty_card_queue_set() {
1650 return _dirty_card_queue_set;
1651 }
1652 #endif // !SERIALGC
1654 // This method initializes the SATB and dirty card queues before a
1655 // JavaThread is added to the Java thread list. Right now, we don't
1656 // have to do anything to the dirty card queue (it should have been
1657 // activated when the thread was created), but we have to activate
1658 // the SATB queue if the thread is created while a marking cycle is
1659 // in progress. The activation / de-activation of the SATB queues at
1660 // the beginning / end of a marking cycle is done during safepoints
1661 // so we have to make sure this method is called outside one to be
1662 // able to safely read the active field of the SATB queue set. Right
1663 // now, it is called just before the thread is added to the Java
1664 // thread list in the Threads::add() method. That method is holding
1665 // the Threads_lock which ensures we are outside a safepoint. We
1666 // cannot do the obvious and set the active field of the SATB queue
1667 // when the thread is created given that, in some cases, safepoints
1668 // might happen between the JavaThread constructor being called and the
1669 // thread being added to the Java thread list (an example of this is
1670 // when the structure for the DestroyJavaVM thread is created).
1671 #ifndef SERIALGC
1672 void initialize_queues();
1673 #else // !SERIALGC
1674 void initialize_queues() { }
1675 #endif // !SERIALGC
1677 // Machine dependent stuff
1678 #ifdef TARGET_OS_ARCH_linux_x86
1679 # include "thread_linux_x86.hpp"
1680 #endif
1681 #ifdef TARGET_OS_ARCH_linux_sparc
1682 # include "thread_linux_sparc.hpp"
1683 #endif
1684 #ifdef TARGET_OS_ARCH_linux_zero
1685 # include "thread_linux_zero.hpp"
1686 #endif
1687 #ifdef TARGET_OS_ARCH_solaris_x86
1688 # include "thread_solaris_x86.hpp"
1689 #endif
1690 #ifdef TARGET_OS_ARCH_solaris_sparc
1691 # include "thread_solaris_sparc.hpp"
1692 #endif
1693 #ifdef TARGET_OS_ARCH_windows_x86
1694 # include "thread_windows_x86.hpp"
1695 #endif
1696 #ifdef TARGET_OS_ARCH_linux_arm
1697 # include "thread_linux_arm.hpp"
1698 #endif
1699 #ifdef TARGET_OS_ARCH_linux_ppc
1700 # include "thread_linux_ppc.hpp"
1701 #endif
1702 #ifdef TARGET_OS_ARCH_bsd_x86
1703 # include "thread_bsd_x86.hpp"
1704 #endif
1705 #ifdef TARGET_OS_ARCH_bsd_zero
1706 # include "thread_bsd_zero.hpp"
1707 #endif
1710 public:
1711 void set_blocked_on_compilation(bool value) {
1712 _blocked_on_compilation = value;
1713 }
1715 bool blocked_on_compilation() {
1716 return _blocked_on_compilation;
1717 }
1718 protected:
1719 bool _blocked_on_compilation;
1722 // JSR166 per-thread parker
1723 private:
1724 Parker* _parker;
1725 public:
1726 Parker* parker() { return _parker; }
1728 // Biased locking support
1729 private:
1730 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1731 public:
1732 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1733 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1735 // clearing/querying jni attach status
1736 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1737 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1738 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); }
1739 private:
1740 // This field is used to determine if a thread has claimed
1741 // a par_id: it is -1 if the thread has not claimed a par_id;
1742 // otherwise its value is the par_id that has been claimed.
1743 int _claimed_par_id;
1744 public:
1745 int get_claimed_par_id() { return _claimed_par_id; }
1746 void set_claimed_par_id(int id) { _claimed_par_id = id;}
1747 };
1749 // Inline implementation of JavaThread::current
1750 inline JavaThread* JavaThread::current() {
1751 Thread* thread = ThreadLocalStorage::thread();
1752 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1753 return (JavaThread*)thread;
1754 }
1756 inline CompilerThread* JavaThread::as_CompilerThread() {
1757 assert(is_Compiler_thread(), "just checking");
1758 return (CompilerThread*)this;
1759 }
1761 inline bool JavaThread::stack_yellow_zone_disabled() {
1762 return _stack_guard_state == stack_guard_yellow_disabled;
1763 }
1765 inline bool JavaThread::stack_yellow_zone_enabled() {
1766 #ifdef ASSERT
1767 if (os::uses_stack_guard_pages()) {
1768 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1769 }
1770 #endif
1771 return _stack_guard_state == stack_guard_enabled;
1772 }
1774 inline size_t JavaThread::stack_available(address cur_sp) {
1775 // This code assumes java stacks grow down
1776 address low_addr; // Limit on the address for deepest stack depth
1777 if ( _stack_guard_state == stack_guard_unused) {
1778 low_addr = stack_base() - stack_size();
1779 } else {
1780 low_addr = stack_yellow_zone_base();
1781 }
1782 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1783 }
1785 // A thread used for Compilation.
1786 class CompilerThread : public JavaThread {
1787 friend class VMStructs;
1788 private:
1789 CompilerCounters* _counters;
1791 ciEnv* _env;
1792 CompileLog* _log;
1793 CompileTask* _task;
1794 CompileQueue* _queue;
1795 BufferBlob* _buffer_blob;
1797 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1799 public:
1801 static CompilerThread* current();
1803 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1805 bool is_Compiler_thread() const { return true; }
1806 // Hide this compiler thread from external view.
1807 bool is_hidden_from_external_view() const { return true; }
1809 CompileQueue* queue() { return _queue; }
1810 CompilerCounters* counters() { return _counters; }
1812 // Get/set the thread's compilation environment.
1813 ciEnv* env() { return _env; }
1814 void set_env(ciEnv* env) { _env = env; }
1816 BufferBlob* get_buffer_blob() { return _buffer_blob; }
1817 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1819 // Get/set the thread's logging information
1820 CompileLog* log() { return _log; }
1821 void init_log(CompileLog* log) {
1822 // Set once, for good.
1823 assert(_log == NULL, "set only once");
1824 _log = log;
1825 }
1827 // GC support
1828 // Apply "f->do_oop" to all root oops in "this".
1829 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1830 void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1832 #ifndef PRODUCT
1833 private:
1834 IdealGraphPrinter *_ideal_graph_printer;
1835 public:
1836 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1837 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1838 #endif
1840 // Get/set the thread's current task
1841 CompileTask* task() { return _task; }
1842 void set_task(CompileTask* task) { _task = task; }
1844 // Track the nmethod currently being scanned by the sweeper
1845 void set_scanned_nmethod(nmethod* nm) {
1846 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1847 _scanned_nmethod = nm;
1848 }
1849 };
1851 inline CompilerThread* CompilerThread::current() {
1852 return JavaThread::current()->as_CompilerThread();
1853 }
1856 // The active thread queue. It also keeps track of the current used
1857 // thread priorities.
1858 class Threads: AllStatic {
1859 friend class VMStructs;
1860 private:
1861 static JavaThread* _thread_list;
1862 static int _number_of_threads;
1863 static int _number_of_non_daemon_threads;
1864 static int _return_code;
1865 #ifdef ASSERT
1866 static bool _vm_complete;
1867 #endif
1869 public:
1870 // Thread management
1871 // force_daemon is a concession to JNI, where we may need to add a
1872 // thread to the thread list before allocating its thread object
1873 static void add(JavaThread* p, bool force_daemon = false);
1874 static void remove(JavaThread* p);
1875 static bool includes(JavaThread* p);
1876 static JavaThread* first() { return _thread_list; }
1877 static void threads_do(ThreadClosure* tc);
1879 // Initializes the vm and creates the vm thread
1880 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1881 static void convert_vm_init_libraries_to_agents();
1882 static void create_vm_init_libraries();
1883 static void create_vm_init_agents();
1884 static void shutdown_vm_agents();
1885 static bool destroy_vm();
1886 // Supported VM versions via JNI
1887 // Includes JNI_VERSION_1_1
1888 static jboolean is_supported_jni_version_including_1_1(jint version);
1889 // Does not include JNI_VERSION_1_1
1890 static jboolean is_supported_jni_version(jint version);
1892 // Garbage collection
1893 static void follow_other_roots(void f(oop*));
1895 // Apply "f->do_oop" to all root oops in all threads.
1896 // This version may only be called by sequential code.
1897 static void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1898 // This version may be called by sequential or parallel code.
1899 static void possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
1900 // This creates a list of GCTasks, one per thread.
1901 static void create_thread_roots_tasks(GCTaskQueue* q);
1902 // This creates a list of GCTasks, one per thread, for marking objects.
1903 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1905 // Apply "f->do_oop" to roots in all threads that
1906 // are part of compiled frames
1907 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1909 static void convert_hcode_pointers();
1910 static void restore_hcode_pointers();
1912 // Sweeper
1913 static void nmethods_do(CodeBlobClosure* cf);
1915 // RedefineClasses support
1916 static void metadata_do(void f(Metadata*));
1918 static void gc_epilogue();
1919 static void gc_prologue();
1920 #ifdef ASSERT
1921 static bool is_vm_complete() { return _vm_complete; }
1922 #endif
1924 // Verification
1925 static void verify();
1926 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1927 static void print(bool print_stacks, bool internal_format) {
1928 // this function is only used by debug.cpp
1929 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1930 }
1931 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1933 // Get Java threads that are waiting to enter a monitor. If doLock
1934 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1935 // VM needs to be at a safepoint.
1936 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1937 address monitor, bool doLock);
1939 // Get owning Java thread from the monitor's owner field. If doLock
1940 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1941 // VM needs to be at a safepoint.
1942 static JavaThread *owning_thread_from_monitor_owner(address owner,
1943 bool doLock);
1945 // Number of threads on the active threads list
1946 static int number_of_threads() { return _number_of_threads; }
1947 // Number of non-daemon threads on the active threads list
1948 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1950 // Deoptimizes all frames tied to marked nmethods
1951 static void deoptimized_wrt_marked_nmethods();
1953 };
1956 // Thread iterator
1957 class ThreadClosure: public StackObj {
1958 public:
1959 virtual void do_thread(Thread* thread) = 0;
1960 };
1962 class SignalHandlerMark: public StackObj {
1963 private:
1964 Thread* _thread;
1965 public:
1966 SignalHandlerMark(Thread* t) {
1967 _thread = t;
1968 if (_thread) _thread->enter_signal_handler();
1969 }
1970 ~SignalHandlerMark() {
1971 if (_thread) _thread->leave_signal_handler();
1972 _thread = NULL;
1973 }
1974 };
1977 #endif // SHARE_VM_RUNTIME_THREAD_HPP