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rev 6875 : 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
Reviewed-by: mgerdin, coleenp, bdelsart
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--- old/src/share/vm/runtime/thread.hpp
+++ new/src/share/vm/runtime/thread.hpp
1 1 /*
2 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 20 * or visit www.oracle.com if you need additional information or have any
21 21 * questions.
22 22 *
23 23 */
24 24
25 25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 26 #define SHARE_VM_RUNTIME_THREAD_HPP
27 27
28 28 #include "memory/allocation.hpp"
29 29 #include "memory/threadLocalAllocBuffer.hpp"
30 30 #include "oops/oop.hpp"
31 31 #include "prims/jni.h"
32 32 #include "prims/jvmtiExport.hpp"
33 33 #include "runtime/frame.hpp"
34 34 #include "runtime/javaFrameAnchor.hpp"
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35 35 #include "runtime/jniHandles.hpp"
36 36 #include "runtime/mutexLocker.hpp"
37 37 #include "runtime/os.hpp"
38 38 #include "runtime/osThread.hpp"
39 39 #include "runtime/park.hpp"
40 40 #include "runtime/safepoint.hpp"
41 41 #include "runtime/stubRoutines.hpp"
42 42 #include "runtime/threadLocalStorage.hpp"
43 43 #include "runtime/thread_ext.hpp"
44 44 #include "runtime/unhandledOops.hpp"
45 -#include "utilities/macros.hpp"
46 -
47 45 #include "trace/traceBackend.hpp"
48 46 #include "trace/traceMacros.hpp"
49 47 #include "utilities/exceptions.hpp"
48 +#include "utilities/macros.hpp"
50 49 #include "utilities/top.hpp"
51 50 #if INCLUDE_ALL_GCS
52 51 #include "gc_implementation/g1/dirtyCardQueue.hpp"
53 52 #include "gc_implementation/g1/satbQueue.hpp"
54 53 #endif // INCLUDE_ALL_GCS
55 54 #ifdef ZERO
56 55 #ifdef TARGET_ARCH_zero
57 56 # include "stack_zero.hpp"
58 57 #endif
59 58 #endif
60 59
61 60 class ThreadSafepointState;
62 61 class ThreadProfiler;
63 62
64 63 class JvmtiThreadState;
65 64 class JvmtiGetLoadedClassesClosure;
66 65 class ThreadStatistics;
67 66 class ConcurrentLocksDump;
68 67 class ParkEvent;
69 68 class Parker;
70 69
71 70 class ciEnv;
72 71 class CompileThread;
73 72 class CompileLog;
74 73 class CompileTask;
75 74 class CompileQueue;
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76 75 class CompilerCounters;
77 76 class vframeArray;
78 77
79 78 class DeoptResourceMark;
80 79 class jvmtiDeferredLocalVariableSet;
81 80
82 81 class GCTaskQueue;
83 82 class ThreadClosure;
84 83 class IdealGraphPrinter;
85 84
85 +class Metadata;
86 +template <class T, MEMFLAGS F> class ChunkedList;
87 +typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
88 +
86 89 DEBUG_ONLY(class ResourceMark;)
87 90
88 91 class WorkerThread;
89 92
90 93 // Class hierarchy
91 94 // - Thread
92 95 // - NamedThread
93 96 // - VMThread
94 97 // - ConcurrentGCThread
95 98 // - WorkerThread
96 99 // - GangWorker
97 100 // - GCTaskThread
98 101 // - JavaThread
99 102 // - WatcherThread
100 103
101 104 class Thread: public ThreadShadow {
102 105 friend class VMStructs;
103 106 private:
104 107 // Exception handling
105 108 // (Note: _pending_exception and friends are in ThreadShadow)
106 109 //oop _pending_exception; // pending exception for current thread
107 110 // const char* _exception_file; // file information for exception (debugging only)
108 111 // int _exception_line; // line information for exception (debugging only)
109 112 protected:
110 113 // Support for forcing alignment of thread objects for biased locking
111 114 void* _real_malloc_address;
112 115 public:
113 116 void* operator new(size_t size) throw() { return allocate(size, true); }
114 117 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
115 118 return allocate(size, false); }
116 119 void operator delete(void* p);
117 120
118 121 protected:
119 122 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
120 123 private:
121 124
122 125 // ***************************************************************
123 126 // Suspend and resume support
124 127 // ***************************************************************
125 128 //
126 129 // VM suspend/resume no longer exists - it was once used for various
127 130 // things including safepoints but was deprecated and finally removed
128 131 // in Java 7. Because VM suspension was considered "internal" Java-level
129 132 // suspension was considered "external", and this legacy naming scheme
130 133 // remains.
131 134 //
132 135 // External suspend/resume requests come from JVM_SuspendThread,
133 136 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
134 137 // ResumeThread. External
135 138 // suspend requests cause _external_suspend to be set and external
136 139 // resume requests cause _external_suspend to be cleared.
137 140 // External suspend requests do not nest on top of other external
138 141 // suspend requests. The higher level APIs reject suspend requests
139 142 // for already suspended threads.
140 143 //
141 144 // The external_suspend
142 145 // flag is checked by has_special_runtime_exit_condition() and java thread
143 146 // will self-suspend when handle_special_runtime_exit_condition() is
144 147 // called. Most uses of the _thread_blocked state in JavaThreads are
145 148 // considered the same as being externally suspended; if the blocking
146 149 // condition lifts, the JavaThread will self-suspend. Other places
147 150 // where VM checks for external_suspend include:
148 151 // + mutex granting (do not enter monitors when thread is suspended)
149 152 // + state transitions from _thread_in_native
150 153 //
151 154 // In general, java_suspend() does not wait for an external suspend
152 155 // request to complete. When it returns, the only guarantee is that
153 156 // the _external_suspend field is true.
154 157 //
155 158 // wait_for_ext_suspend_completion() is used to wait for an external
156 159 // suspend request to complete. External suspend requests are usually
157 160 // followed by some other interface call that requires the thread to
158 161 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
159 162 // the interface that requires quiescence, we give the JavaThread a
160 163 // chance to self-suspend before we need it to be quiescent. This
161 164 // improves overall suspend/query performance.
162 165 //
163 166 // _suspend_flags controls the behavior of java_ suspend/resume.
164 167 // It must be set under the protection of SR_lock. Read from the flag is
165 168 // OK without SR_lock as long as the value is only used as a hint.
166 169 // (e.g., check _external_suspend first without lock and then recheck
167 170 // inside SR_lock and finish the suspension)
168 171 //
169 172 // _suspend_flags is also overloaded for other "special conditions" so
170 173 // that a single check indicates whether any special action is needed
171 174 // eg. for async exceptions.
172 175 // -------------------------------------------------------------------
173 176 // Notes:
174 177 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
175 178 // but we still update its value to keep other part of the system (mainly
176 179 // JVMTI) happy. ThreadState is legacy code (see notes in
177 180 // osThread.hpp).
178 181 //
179 182 // 2. It would be more natural if set_external_suspend() is private and
180 183 // part of java_suspend(), but that probably would affect the suspend/query
181 184 // performance. Need more investigation on this.
182 185 //
183 186
184 187 // suspend/resume lock: used for self-suspend
185 188 Monitor* _SR_lock;
186 189
187 190 protected:
188 191 enum SuspendFlags {
189 192 // NOTE: avoid using the sign-bit as cc generates different test code
190 193 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
191 194
192 195 _external_suspend = 0x20000000U, // thread is asked to self suspend
193 196 _ext_suspended = 0x40000000U, // thread has self-suspended
194 197 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
195 198
196 199 _has_async_exception = 0x00000001U, // there is a pending async exception
197 200 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
198 201 };
199 202
200 203 // various suspension related flags - atomically updated
201 204 // overloaded for async exception checking in check_special_condition_for_native_trans.
202 205 volatile uint32_t _suspend_flags;
203 206
204 207 private:
205 208 int _num_nested_signal;
206 209
207 210 public:
208 211 void enter_signal_handler() { _num_nested_signal++; }
209 212 void leave_signal_handler() { _num_nested_signal--; }
210 213 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
211 214
212 215 private:
213 216 // Debug tracing
214 217 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
215 218
216 219 // Active_handles points to a block of handles
217 220 JNIHandleBlock* _active_handles;
218 221
219 222 // One-element thread local free list
220 223 JNIHandleBlock* _free_handle_block;
221 224
222 225 // Point to the last handle mark
223 226 HandleMark* _last_handle_mark;
224 227
225 228 // The parity of the last strong_roots iteration in which this thread was
226 229 // claimed as a task.
227 230 jint _oops_do_parity;
228 231
229 232 public:
230 233 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
231 234 HandleMark* last_handle_mark() const { return _last_handle_mark; }
232 235 private:
233 236
234 237 // debug support for checking if code does allow safepoints or not
235 238 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
236 239 // mutex, or blocking on an object synchronizer (Java locking).
237 240 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
238 241 // If !allow_allocation(), then an assertion failure will happen during allocation
239 242 // (Hence, !allow_safepoint() => !allow_allocation()).
240 243 //
241 244 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
242 245 //
243 246 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
244 247 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
245 248
246 249 // Used by SkipGCALot class.
247 250 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
248 251
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249 252 friend class No_Alloc_Verifier;
250 253 friend class No_Safepoint_Verifier;
251 254 friend class Pause_No_Safepoint_Verifier;
252 255 friend class ThreadLocalStorage;
253 256 friend class GC_locker;
254 257
255 258 ThreadLocalAllocBuffer _tlab; // Thread-local eden
256 259 jlong _allocated_bytes; // Cumulative number of bytes allocated on
257 260 // the Java heap
258 261
262 + // Thread-local buffer used by MetadataOnStackMark.
263 + MetadataOnStackBuffer* _metadata_on_stack_buffer;
264 +
259 265 TRACE_DATA _trace_data; // Thread-local data for tracing
260 266
261 267 ThreadExt _ext;
262 268
263 269 int _vm_operation_started_count; // VM_Operation support
264 270 int _vm_operation_completed_count; // VM_Operation support
265 271
266 272 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
267 273 // is waiting to lock
268 274 bool _current_pending_monitor_is_from_java; // locking is from Java code
269 275
270 276 // ObjectMonitor on which this thread called Object.wait()
271 277 ObjectMonitor* _current_waiting_monitor;
272 278
273 279 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
274 280 public:
275 281 ObjectMonitor* omFreeList;
276 282 int omFreeCount; // length of omFreeList
277 283 int omFreeProvision; // reload chunk size
278 284 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
279 285 int omInUseCount; // length of omInUseList
280 286
281 287 #ifdef ASSERT
282 288 private:
283 289 bool _visited_for_critical_count;
284 290
285 291 public:
286 292 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
287 293 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
288 294 #endif
289 295
290 296 public:
291 297 enum {
292 298 is_definitely_current_thread = true
293 299 };
294 300
295 301 // Constructor
296 302 Thread();
297 303 virtual ~Thread();
298 304
299 305 // initializtion
300 306 void initialize_thread_local_storage();
301 307
302 308 // thread entry point
303 309 virtual void run();
304 310
305 311 // Testers
306 312 virtual bool is_VM_thread() const { return false; }
307 313 virtual bool is_Java_thread() const { return false; }
308 314 virtual bool is_Compiler_thread() const { return false; }
309 315 virtual bool is_hidden_from_external_view() const { return false; }
310 316 virtual bool is_jvmti_agent_thread() const { return false; }
311 317 // True iff the thread can perform GC operations at a safepoint.
312 318 // Generally will be true only of VM thread and parallel GC WorkGang
313 319 // threads.
314 320 virtual bool is_GC_task_thread() const { return false; }
315 321 virtual bool is_Watcher_thread() const { return false; }
316 322 virtual bool is_ConcurrentGC_thread() const { return false; }
317 323 virtual bool is_Named_thread() const { return false; }
318 324 virtual bool is_Worker_thread() const { return false; }
319 325
320 326 // Casts
321 327 virtual WorkerThread* as_Worker_thread() const { return NULL; }
322 328
323 329 virtual char* name() const { return (char*)"Unknown thread"; }
324 330
325 331 // Returns the current thread
326 332 static inline Thread* current();
327 333
328 334 // Common thread operations
329 335 static void set_priority(Thread* thread, ThreadPriority priority);
330 336 static ThreadPriority get_priority(const Thread* const thread);
331 337 static void start(Thread* thread);
332 338 static void interrupt(Thread* thr);
333 339 static bool is_interrupted(Thread* thr, bool clear_interrupted);
334 340
335 341 void set_native_thread_name(const char *name) {
336 342 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
337 343 os::set_native_thread_name(name);
338 344 }
339 345
340 346 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
341 347 Monitor* SR_lock() const { return _SR_lock; }
342 348
343 349 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
344 350
345 351 void set_suspend_flag(SuspendFlags f) {
346 352 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
347 353 uint32_t flags;
348 354 do {
349 355 flags = _suspend_flags;
350 356 }
351 357 while (Atomic::cmpxchg((jint)(flags | f),
352 358 (volatile jint*)&_suspend_flags,
353 359 (jint)flags) != (jint)flags);
354 360 }
355 361 void clear_suspend_flag(SuspendFlags f) {
356 362 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
357 363 uint32_t flags;
358 364 do {
359 365 flags = _suspend_flags;
360 366 }
361 367 while (Atomic::cmpxchg((jint)(flags & ~f),
362 368 (volatile jint*)&_suspend_flags,
363 369 (jint)flags) != (jint)flags);
364 370 }
365 371
366 372 void set_has_async_exception() {
367 373 set_suspend_flag(_has_async_exception);
368 374 }
369 375 void clear_has_async_exception() {
370 376 clear_suspend_flag(_has_async_exception);
371 377 }
372 378
373 379 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
374 380
375 381 void set_critical_native_unlock() {
376 382 set_suspend_flag(_critical_native_unlock);
377 383 }
378 384 void clear_critical_native_unlock() {
379 385 clear_suspend_flag(_critical_native_unlock);
380 386 }
381 387
382 388 // Support for Unhandled Oop detection
383 389 #ifdef CHECK_UNHANDLED_OOPS
384 390 private:
385 391 UnhandledOops* _unhandled_oops;
386 392 public:
387 393 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
388 394 // Mark oop safe for gc. It may be stack allocated but won't move.
389 395 void allow_unhandled_oop(oop *op) {
390 396 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
391 397 }
392 398 // Clear oops at safepoint so crashes point to unhandled oop violator
393 399 void clear_unhandled_oops() {
394 400 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
395 401 }
396 402 #endif // CHECK_UNHANDLED_OOPS
397 403
398 404 #ifndef PRODUCT
399 405 bool skip_gcalot() { return _skip_gcalot; }
400 406 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
401 407 #endif
402 408
403 409 public:
404 410 // Installs a pending exception to be inserted later
405 411 static void send_async_exception(oop thread_oop, oop java_throwable);
406 412
407 413 // Resource area
408 414 ResourceArea* resource_area() const { return _resource_area; }
409 415 void set_resource_area(ResourceArea* area) { _resource_area = area; }
410 416
411 417 OSThread* osthread() const { return _osthread; }
412 418 void set_osthread(OSThread* thread) { _osthread = thread; }
413 419
414 420 // JNI handle support
415 421 JNIHandleBlock* active_handles() const { return _active_handles; }
416 422 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
417 423 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
418 424 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
419 425
420 426 // Internal handle support
421 427 HandleArea* handle_area() const { return _handle_area; }
422 428 void set_handle_area(HandleArea* area) { _handle_area = area; }
423 429
424 430 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
425 431 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
426 432
427 433 // Thread-Local Allocation Buffer (TLAB) support
428 434 ThreadLocalAllocBuffer& tlab() { return _tlab; }
429 435 void initialize_tlab() {
430 436 if (UseTLAB) {
431 437 tlab().initialize();
432 438 }
433 439 }
434 440
435 441 jlong allocated_bytes() { return _allocated_bytes; }
436 442 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
437 443 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
438 444 inline jlong cooked_allocated_bytes();
439 445
440 446 TRACE_DATA* trace_data() { return &_trace_data; }
441 447
442 448 const ThreadExt& ext() const { return _ext; }
443 449 ThreadExt& ext() { return _ext; }
444 450
445 451 // VM operation support
446 452 int vm_operation_ticket() { return ++_vm_operation_started_count; }
447 453 int vm_operation_completed_count() { return _vm_operation_completed_count; }
448 454 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
449 455
450 456 // For tracking the heavyweight monitor the thread is pending on.
451 457 ObjectMonitor* current_pending_monitor() {
452 458 return _current_pending_monitor;
453 459 }
454 460 void set_current_pending_monitor(ObjectMonitor* monitor) {
455 461 _current_pending_monitor = monitor;
456 462 }
457 463 void set_current_pending_monitor_is_from_java(bool from_java) {
458 464 _current_pending_monitor_is_from_java = from_java;
459 465 }
460 466 bool current_pending_monitor_is_from_java() {
461 467 return _current_pending_monitor_is_from_java;
462 468 }
463 469
464 470 // For tracking the ObjectMonitor on which this thread called Object.wait()
465 471 ObjectMonitor* current_waiting_monitor() {
466 472 return _current_waiting_monitor;
467 473 }
468 474 void set_current_waiting_monitor(ObjectMonitor* monitor) {
469 475 _current_waiting_monitor = monitor;
470 476 }
471 477
472 478 // GC support
473 479 // Apply "f->do_oop" to all root oops in "this".
474 480 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
475 481 // Used by JavaThread::oops_do.
476 482 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
477 483 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
478 484
479 485 // Handles the parallel case for the method below.
480 486 private:
481 487 bool claim_oops_do_par_case(int collection_parity);
482 488 public:
483 489 // Requires that "collection_parity" is that of the current roots
484 490 // iteration. If "is_par" is false, sets the parity of "this" to
485 491 // "collection_parity", and returns "true". If "is_par" is true,
486 492 // uses an atomic instruction to set the current threads parity to
487 493 // "collection_parity", if it is not already. Returns "true" iff the
488 494 // calling thread does the update, this indicates that the calling thread
489 495 // has claimed the thread's stack as a root groop in the current
490 496 // collection.
491 497 bool claim_oops_do(bool is_par, int collection_parity) {
492 498 if (!is_par) {
493 499 _oops_do_parity = collection_parity;
494 500 return true;
495 501 } else {
496 502 return claim_oops_do_par_case(collection_parity);
497 503 }
498 504 }
499 505
500 506 // Sweeper support
501 507 void nmethods_do(CodeBlobClosure* cf);
502 508
503 509 // jvmtiRedefineClasses support
504 510 void metadata_do(void f(Metadata*));
505 511
506 512 // Used by fast lock support
507 513 virtual bool is_lock_owned(address adr) const;
508 514
509 515 // Check if address is in the stack of the thread (not just for locks).
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510 516 // Warning: the method can only be used on the running thread
511 517 bool is_in_stack(address adr) const;
512 518 // Check if address is in the usable part of the stack (excludes protected
513 519 // guard pages)
514 520 bool is_in_usable_stack(address adr) const;
515 521
516 522 // Sets this thread as starting thread. Returns failure if thread
517 523 // creation fails due to lack of memory, too many threads etc.
518 524 bool set_as_starting_thread();
519 525
520 - protected:
526 + void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; }
527 + MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; }
528 +
529 +protected:
521 530 // OS data associated with the thread
522 531 OSThread* _osthread; // Platform-specific thread information
523 532
524 533 // Thread local resource area for temporary allocation within the VM
525 534 ResourceArea* _resource_area;
526 535
527 536 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
528 537
529 538 // Thread local handle area for allocation of handles within the VM
530 539 HandleArea* _handle_area;
531 540 GrowableArray<Metadata*>* _metadata_handles;
532 541
533 542 // Support for stack overflow handling, get_thread, etc.
534 543 address _stack_base;
535 544 size_t _stack_size;
536 545 uintptr_t _self_raw_id; // used by get_thread (mutable)
537 546 int _lgrp_id;
538 547
539 548 public:
540 549 // Stack overflow support
541 550 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
542 551
543 552 void set_stack_base(address base) { _stack_base = base; }
544 553 size_t stack_size() const { return _stack_size; }
545 554 void set_stack_size(size_t size) { _stack_size = size; }
546 555 void record_stack_base_and_size();
547 556
548 557 bool on_local_stack(address adr) const {
549 558 /* QQQ this has knowledge of direction, ought to be a stack method */
550 559 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
551 560 }
552 561
553 562 uintptr_t self_raw_id() { return _self_raw_id; }
554 563 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
555 564
556 565 int lgrp_id() const { return _lgrp_id; }
557 566 void set_lgrp_id(int value) { _lgrp_id = value; }
558 567
559 568 // Printing
560 569 void print_on(outputStream* st) const;
561 570 void print() const { print_on(tty); }
562 571 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
563 572
564 573 // Debug-only code
565 574 #ifdef ASSERT
566 575 private:
567 576 // Deadlock detection support for Mutex locks. List of locks own by thread.
568 577 Monitor* _owned_locks;
569 578 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
570 579 // thus the friendship
571 580 friend class Mutex;
572 581 friend class Monitor;
573 582
574 583 public:
575 584 void print_owned_locks_on(outputStream* st) const;
576 585 void print_owned_locks() const { print_owned_locks_on(tty); }
577 586 Monitor* owned_locks() const { return _owned_locks; }
578 587 bool owns_locks() const { return owned_locks() != NULL; }
579 588 bool owns_locks_but_compiled_lock() const;
580 589
581 590 // Deadlock detection
582 591 bool allow_allocation() { return _allow_allocation_count == 0; }
583 592 ResourceMark* current_resource_mark() { return _current_resource_mark; }
584 593 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
585 594 #endif
586 595
587 596 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
588 597
589 598 private:
590 599 volatile int _jvmti_env_iteration_count;
591 600
592 601 public:
593 602 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
594 603 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
595 604 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
596 605
597 606 // Code generation
598 607 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
599 608 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
600 609 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
601 610
602 611 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
603 612 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
604 613
605 614 #define TLAB_FIELD_OFFSET(name) \
606 615 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
607 616
608 617 TLAB_FIELD_OFFSET(start)
609 618 TLAB_FIELD_OFFSET(end)
610 619 TLAB_FIELD_OFFSET(top)
611 620 TLAB_FIELD_OFFSET(pf_top)
612 621 TLAB_FIELD_OFFSET(size) // desired_size
613 622 TLAB_FIELD_OFFSET(refill_waste_limit)
614 623 TLAB_FIELD_OFFSET(number_of_refills)
615 624 TLAB_FIELD_OFFSET(fast_refill_waste)
616 625 TLAB_FIELD_OFFSET(slow_allocations)
617 626
618 627 #undef TLAB_FIELD_OFFSET
619 628
620 629 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
621 630
622 631 public:
623 632 volatile intptr_t _Stalled ;
624 633 volatile int _TypeTag ;
625 634 ParkEvent * _ParkEvent ; // for synchronized()
626 635 ParkEvent * _SleepEvent ; // for Thread.sleep
627 636 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
628 637 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
629 638 int NativeSyncRecursion ; // diagnostic
630 639
631 640 volatile int _OnTrap ; // Resume-at IP delta
632 641 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
633 642 jint _hashStateX ; // thread-specific hashCode generator state
634 643 jint _hashStateY ;
635 644 jint _hashStateZ ;
636 645 void * _schedctl ;
637 646
638 647
639 648 volatile jint rng [4] ; // RNG for spin loop
640 649
641 650 // Low-level leaf-lock primitives used to implement synchronization
642 651 // and native monitor-mutex infrastructure.
643 652 // Not for general synchronization use.
644 653 static void SpinAcquire (volatile int * Lock, const char * Name) ;
645 654 static void SpinRelease (volatile int * Lock) ;
646 655 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
647 656 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
648 657 static void muxRelease (volatile intptr_t * Lock) ;
649 658 };
650 659
651 660 // Inline implementation of Thread::current()
652 661 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
653 662 // startup.
654 663 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
655 664 // period. This is inlined in thread_<os_family>.inline.hpp.
656 665
657 666 inline Thread* Thread::current() {
658 667 #ifdef ASSERT
659 668 // This function is very high traffic. Define PARANOID to enable expensive
660 669 // asserts.
661 670 #ifdef PARANOID
662 671 // Signal handler should call ThreadLocalStorage::get_thread_slow()
663 672 Thread* t = ThreadLocalStorage::get_thread_slow();
664 673 assert(t != NULL && !t->is_inside_signal_handler(),
665 674 "Don't use Thread::current() inside signal handler");
666 675 #endif
667 676 #endif
668 677 Thread* thread = ThreadLocalStorage::thread();
669 678 assert(thread != NULL, "just checking");
670 679 return thread;
671 680 }
672 681
673 682 // Name support for threads. non-JavaThread subclasses with multiple
674 683 // uniquely named instances should derive from this.
675 684 class NamedThread: public Thread {
676 685 friend class VMStructs;
677 686 enum {
678 687 max_name_len = 64
679 688 };
680 689 private:
681 690 char* _name;
682 691 // log JavaThread being processed by oops_do
683 692 JavaThread* _processed_thread;
684 693
685 694 public:
686 695 NamedThread();
687 696 ~NamedThread();
688 697 // May only be called once per thread.
689 698 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
690 699 virtual bool is_Named_thread() const { return true; }
691 700 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
692 701 JavaThread *processed_thread() { return _processed_thread; }
693 702 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
694 703 };
695 704
696 705 // Worker threads are named and have an id of an assigned work.
697 706 class WorkerThread: public NamedThread {
698 707 private:
699 708 uint _id;
700 709 public:
701 710 WorkerThread() : _id(0) { }
702 711 virtual bool is_Worker_thread() const { return true; }
703 712
704 713 virtual WorkerThread* as_Worker_thread() const {
705 714 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
706 715 return (WorkerThread*) this;
707 716 }
708 717
709 718 void set_id(uint work_id) { _id = work_id; }
710 719 uint id() const { return _id; }
711 720 };
712 721
713 722 // A single WatcherThread is used for simulating timer interrupts.
714 723 class WatcherThread: public Thread {
715 724 friend class VMStructs;
716 725 public:
717 726 virtual void run();
718 727
719 728 private:
720 729 static WatcherThread* _watcher_thread;
721 730
722 731 static bool _startable;
723 732 volatile static bool _should_terminate; // updated without holding lock
724 733
725 734 os::WatcherThreadCrashProtection* _crash_protection;
726 735 public:
727 736 enum SomeConstants {
728 737 delay_interval = 10 // interrupt delay in milliseconds
729 738 };
730 739
731 740 // Constructor
732 741 WatcherThread();
733 742
734 743 // Tester
735 744 bool is_Watcher_thread() const { return true; }
736 745
737 746 // Printing
738 747 char* name() const { return (char*)"VM Periodic Task Thread"; }
739 748 void print_on(outputStream* st) const;
740 749 void print() const { print_on(tty); }
741 750 void unpark();
742 751
743 752 // Returns the single instance of WatcherThread
744 753 static WatcherThread* watcher_thread() { return _watcher_thread; }
745 754
746 755 // Create and start the single instance of WatcherThread, or stop it on shutdown
747 756 static void start();
748 757 static void stop();
749 758 // Only allow start once the VM is sufficiently initialized
750 759 // Otherwise the first task to enroll will trigger the start
751 760 static void make_startable();
752 761
753 762 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
754 763 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
755 764 _crash_protection = crash_protection;
756 765 }
757 766
758 767 bool has_crash_protection() const { return _crash_protection != NULL; }
759 768 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
760 769
761 770 private:
762 771 int sleep() const;
763 772 };
764 773
765 774
766 775 class CompilerThread;
767 776
768 777 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
769 778
770 779 class JavaThread: public Thread {
771 780 friend class VMStructs;
772 781 private:
773 782 JavaThread* _next; // The next thread in the Threads list
774 783 oop _threadObj; // The Java level thread object
775 784
776 785 #ifdef ASSERT
777 786 private:
778 787 int _java_call_counter;
779 788
780 789 public:
781 790 int java_call_counter() { return _java_call_counter; }
782 791 void inc_java_call_counter() { _java_call_counter++; }
783 792 void dec_java_call_counter() {
784 793 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
785 794 _java_call_counter--;
786 795 }
787 796 private: // restore original namespace restriction
788 797 #endif // ifdef ASSERT
789 798
790 799 #ifndef PRODUCT
791 800 public:
792 801 enum {
793 802 jump_ring_buffer_size = 16
794 803 };
795 804 private: // restore original namespace restriction
796 805 #endif
797 806
798 807 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
799 808
800 809 ThreadFunction _entry_point;
801 810
802 811 JNIEnv _jni_environment;
803 812
804 813 // Deopt support
805 814 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
806 815
807 816 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
808 817 // transition out of native
809 818 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
810 819 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
811 820 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
812 821 // Because deoptimization is lazy we must save jvmti requests to set locals
813 822 // in compiled frames until we deoptimize and we have an interpreter frame.
814 823 // This holds the pointer to array (yeah like there might be more than one) of
815 824 // description of compiled vframes that have locals that need to be updated.
816 825 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
817 826
818 827 // Handshake value for fixing 6243940. We need a place for the i2c
819 828 // adapter to store the callee Method*. This value is NEVER live
820 829 // across a gc point so it does NOT have to be gc'd
821 830 // The handshake is open ended since we can't be certain that it will
822 831 // be NULLed. This is because we rarely ever see the race and end up
823 832 // in handle_wrong_method which is the backend of the handshake. See
824 833 // code in i2c adapters and handle_wrong_method.
825 834
826 835 Method* _callee_target;
827 836
828 837 // Used to pass back results to the interpreter or generated code running Java code.
829 838 oop _vm_result; // oop result is GC-preserved
830 839 Metadata* _vm_result_2; // non-oop result
831 840
832 841 // See ReduceInitialCardMarks: this holds the precise space interval of
833 842 // the most recent slow path allocation for which compiled code has
834 843 // elided card-marks for performance along the fast-path.
835 844 MemRegion _deferred_card_mark;
836 845
837 846 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
838 847 // allocated during deoptimization
839 848 // and by JNI_MonitorEnter/Exit
840 849
841 850 // Async. requests support
842 851 enum AsyncRequests {
843 852 _no_async_condition = 0,
844 853 _async_exception,
845 854 _async_unsafe_access_error
846 855 };
847 856 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
848 857 oop _pending_async_exception;
849 858
850 859 // Safepoint support
851 860 public: // Expose _thread_state for SafeFetchInt()
852 861 volatile JavaThreadState _thread_state;
853 862 private:
854 863 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
855 864 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
856 865
857 866 // JavaThread termination support
858 867 enum TerminatedTypes {
859 868 _not_terminated = 0xDEAD - 2,
860 869 _thread_exiting, // JavaThread::exit() has been called for this thread
861 870 _thread_terminated, // JavaThread is removed from thread list
862 871 _vm_exited // JavaThread is still executing native code, but VM is terminated
863 872 // only VM_Exit can set _vm_exited
864 873 };
865 874
866 875 // In general a JavaThread's _terminated field transitions as follows:
867 876 //
868 877 // _not_terminated => _thread_exiting => _thread_terminated
869 878 //
870 879 // _vm_exited is a special value to cover the case of a JavaThread
871 880 // executing native code after the VM itself is terminated.
872 881 volatile TerminatedTypes _terminated;
873 882 // suspend/resume support
874 883 volatile bool _suspend_equivalent; // Suspend equivalent condition
875 884 jint _in_deopt_handler; // count of deoptimization
876 885 // handlers thread is in
877 886 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
878 887 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
879 888 // never locked) when throwing an exception. Used by interpreter only.
880 889
881 890 // JNI attach states:
882 891 enum JNIAttachStates {
883 892 _not_attaching_via_jni = 1, // thread is not attaching via JNI
884 893 _attaching_via_jni, // thread is attaching via JNI
885 894 _attached_via_jni // thread has attached via JNI
886 895 };
887 896
888 897 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
889 898 // A native thread that is attaching via JNI starts with a value
890 899 // of _attaching_via_jni and transitions to _attached_via_jni.
891 900 volatile JNIAttachStates _jni_attach_state;
892 901
893 902 public:
894 903 // State of the stack guard pages for this thread.
895 904 enum StackGuardState {
896 905 stack_guard_unused, // not needed
897 906 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
898 907 stack_guard_enabled // enabled
899 908 };
900 909
901 910 private:
902 911
903 912 StackGuardState _stack_guard_state;
904 913
905 914 // Precompute the limit of the stack as used in stack overflow checks.
906 915 // We load it from here to simplify the stack overflow check in assembly.
907 916 address _stack_overflow_limit;
908 917
909 918 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
910 919 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
911 920 // code)
912 921 volatile oop _exception_oop; // Exception thrown in compiled code
913 922 volatile address _exception_pc; // PC where exception happened
914 923 volatile address _exception_handler_pc; // PC for handler of exception
915 924 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
916 925
917 926 // support for JNI critical regions
918 927 jint _jni_active_critical; // count of entries into JNI critical region
919 928
920 929 // For deadlock detection.
921 930 int _depth_first_number;
922 931
923 932 // JVMTI PopFrame support
924 933 // This is set to popframe_pending to signal that top Java frame should be popped immediately
925 934 int _popframe_condition;
926 935
927 936 #ifndef PRODUCT
928 937 int _jmp_ring_index;
929 938 struct {
930 939 // We use intptr_t instead of address so debugger doesn't try and display strings
931 940 intptr_t _target;
932 941 intptr_t _instruction;
933 942 const char* _file;
934 943 int _line;
935 944 } _jmp_ring[ jump_ring_buffer_size ];
936 945 #endif /* PRODUCT */
937 946
938 947 #if INCLUDE_ALL_GCS
939 948 // Support for G1 barriers
940 949
941 950 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
942 951 // Set of all such queues.
943 952 static SATBMarkQueueSet _satb_mark_queue_set;
944 953
945 954 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
946 955 // Set of all such queues.
947 956 static DirtyCardQueueSet _dirty_card_queue_set;
948 957
949 958 void flush_barrier_queues();
950 959 #endif // INCLUDE_ALL_GCS
951 960
952 961 friend class VMThread;
953 962 friend class ThreadWaitTransition;
954 963 friend class VM_Exit;
955 964
956 965 void initialize(); // Initialized the instance variables
957 966
958 967 public:
959 968 // Constructor
960 969 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
961 970 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
962 971 ~JavaThread();
963 972
964 973 #ifdef ASSERT
965 974 // verify this JavaThread hasn't be published in the Threads::list yet
966 975 void verify_not_published();
967 976 #endif
968 977
969 978 //JNI functiontable getter/setter for JVMTI jni function table interception API.
970 979 void set_jni_functions(struct JNINativeInterface_* functionTable) {
971 980 _jni_environment.functions = functionTable;
972 981 }
973 982 struct JNINativeInterface_* get_jni_functions() {
974 983 return (struct JNINativeInterface_ *)_jni_environment.functions;
975 984 }
976 985
977 986 // This function is called at thread creation to allow
978 987 // platform specific thread variables to be initialized.
979 988 void cache_global_variables();
980 989
981 990 // Executes Shutdown.shutdown()
982 991 void invoke_shutdown_hooks();
983 992
984 993 // Cleanup on thread exit
985 994 enum ExitType {
986 995 normal_exit,
987 996 jni_detach
988 997 };
989 998 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
990 999
991 1000 void cleanup_failed_attach_current_thread();
992 1001
993 1002 // Testers
994 1003 virtual bool is_Java_thread() const { return true; }
995 1004
996 1005 // Thread chain operations
997 1006 JavaThread* next() const { return _next; }
998 1007 void set_next(JavaThread* p) { _next = p; }
999 1008
1000 1009 // Thread oop. threadObj() can be NULL for initial JavaThread
1001 1010 // (or for threads attached via JNI)
1002 1011 oop threadObj() const { return _threadObj; }
1003 1012 void set_threadObj(oop p) { _threadObj = p; }
1004 1013
1005 1014 ThreadPriority java_priority() const; // Read from threadObj()
1006 1015
1007 1016 // Prepare thread and add to priority queue. If a priority is
1008 1017 // not specified, use the priority of the thread object. Threads_lock
1009 1018 // must be held while this function is called.
1010 1019 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1011 1020 void prepare_ext();
1012 1021
1013 1022 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1014 1023 address saved_exception_pc() { return _saved_exception_pc; }
1015 1024
1016 1025
1017 1026 ThreadFunction entry_point() const { return _entry_point; }
1018 1027
1019 1028 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1020 1029 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1021 1030
1022 1031 // Last frame anchor routines
1023 1032
1024 1033 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1025 1034
1026 1035 // last_Java_sp
1027 1036 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1028 1037 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1029 1038
1030 1039 // last_Java_pc
1031 1040
1032 1041 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1033 1042
1034 1043 // Safepoint support
1035 1044 #ifndef PPC64
1036 1045 JavaThreadState thread_state() const { return _thread_state; }
1037 1046 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1038 1047 #else
1039 1048 // Use membars when accessing volatile _thread_state. See
1040 1049 // Threads::create_vm() for size checks.
1041 1050 inline JavaThreadState thread_state() const;
1042 1051 inline void set_thread_state(JavaThreadState s);
1043 1052 #endif
1044 1053 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1045 1054 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1046 1055 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1047 1056
1048 1057 // thread has called JavaThread::exit() or is terminated
1049 1058 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1050 1059 // thread is terminated (no longer on the threads list); we compare
1051 1060 // against the two non-terminated values so that a freed JavaThread
1052 1061 // will also be considered terminated.
1053 1062 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1054 1063 void set_terminated(TerminatedTypes t) { _terminated = t; }
1055 1064 // special for Threads::remove() which is static:
1056 1065 void set_terminated_value() { _terminated = _thread_terminated; }
1057 1066 void block_if_vm_exited();
1058 1067
1059 1068 bool doing_unsafe_access() { return _doing_unsafe_access; }
1060 1069 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1061 1070
1062 1071 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1063 1072 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1064 1073
1065 1074 // Suspend/resume support for JavaThread
1066 1075 private:
1067 1076 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1068 1077 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1069 1078
1070 1079 public:
1071 1080 void java_suspend();
1072 1081 void java_resume();
1073 1082 int java_suspend_self();
1074 1083
1075 1084 void check_and_wait_while_suspended() {
1076 1085 assert(JavaThread::current() == this, "sanity check");
1077 1086
1078 1087 bool do_self_suspend;
1079 1088 do {
1080 1089 // were we externally suspended while we were waiting?
1081 1090 do_self_suspend = handle_special_suspend_equivalent_condition();
1082 1091 if (do_self_suspend) {
1083 1092 // don't surprise the thread that suspended us by returning
1084 1093 java_suspend_self();
1085 1094 set_suspend_equivalent();
1086 1095 }
1087 1096 } while (do_self_suspend);
1088 1097 }
1089 1098 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1090 1099 // Check for async exception in addition to safepoint and suspend request.
1091 1100 static void check_special_condition_for_native_trans(JavaThread *thread);
1092 1101
1093 1102 // Same as check_special_condition_for_native_trans but finishes the
1094 1103 // transition into thread_in_Java mode so that it can potentially
1095 1104 // block.
1096 1105 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1097 1106
1098 1107 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1099 1108 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1100 1109 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1101 1110 // Warning: is_ext_suspend_completed() may temporarily drop the
1102 1111 // SR_lock to allow the thread to reach a stable thread state if
1103 1112 // it is currently in a transient thread state.
1104 1113 return is_ext_suspend_completed(false /*!called_by_wait */,
1105 1114 SuspendRetryDelay, bits);
1106 1115 }
1107 1116
1108 1117 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1109 1118 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1110 1119 // passed as the count and delay parameters. Experiments with specific
1111 1120 // calls to wait_for_ext_suspend_completion() can be done by passing
1112 1121 // other values in the code. Experiments with all calls can be done
1113 1122 // via the appropriate -XX options.
1114 1123 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1115 1124
1116 1125 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1117 1126 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1118 1127
1119 1128 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1120 1129 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1121 1130 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1122 1131
1123 1132 bool is_external_suspend() const {
1124 1133 return (_suspend_flags & _external_suspend) != 0;
1125 1134 }
1126 1135 // Whenever a thread transitions from native to vm/java it must suspend
1127 1136 // if external|deopt suspend is present.
1128 1137 bool is_suspend_after_native() const {
1129 1138 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1130 1139 }
1131 1140
1132 1141 // external suspend request is completed
1133 1142 bool is_ext_suspended() const {
1134 1143 return (_suspend_flags & _ext_suspended) != 0;
1135 1144 }
1136 1145
1137 1146 bool is_external_suspend_with_lock() const {
1138 1147 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1139 1148 return is_external_suspend();
1140 1149 }
1141 1150
1142 1151 // Special method to handle a pending external suspend request
1143 1152 // when a suspend equivalent condition lifts.
1144 1153 bool handle_special_suspend_equivalent_condition() {
1145 1154 assert(is_suspend_equivalent(),
1146 1155 "should only be called in a suspend equivalence condition");
1147 1156 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1148 1157 bool ret = is_external_suspend();
1149 1158 if (!ret) {
1150 1159 // not about to self-suspend so clear suspend equivalence
1151 1160 clear_suspend_equivalent();
1152 1161 }
1153 1162 // implied else:
1154 1163 // We have a pending external suspend request so we leave the
1155 1164 // suspend_equivalent flag set until java_suspend_self() sets
1156 1165 // the ext_suspended flag and clears the suspend_equivalent
1157 1166 // flag. This insures that wait_for_ext_suspend_completion()
1158 1167 // will return consistent values.
1159 1168 return ret;
1160 1169 }
1161 1170
1162 1171 // utility methods to see if we are doing some kind of suspension
1163 1172 bool is_being_ext_suspended() const {
1164 1173 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1165 1174 return is_ext_suspended() || is_external_suspend();
1166 1175 }
1167 1176
1168 1177 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1169 1178
1170 1179 void set_suspend_equivalent() { _suspend_equivalent = true; };
1171 1180 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1172 1181
1173 1182 // Thread.stop support
1174 1183 void send_thread_stop(oop throwable);
1175 1184 AsyncRequests clear_special_runtime_exit_condition() {
1176 1185 AsyncRequests x = _special_runtime_exit_condition;
1177 1186 _special_runtime_exit_condition = _no_async_condition;
1178 1187 return x;
1179 1188 }
1180 1189
1181 1190 // Are any async conditions present?
1182 1191 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1183 1192
1184 1193 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1185 1194
1186 1195 // these next two are also used for self-suspension and async exception support
1187 1196 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1188 1197
1189 1198 // Return true if JavaThread has an asynchronous condition or
1190 1199 // if external suspension is requested.
1191 1200 bool has_special_runtime_exit_condition() {
1192 1201 // We call is_external_suspend() last since external suspend should
1193 1202 // be less common. Because we don't use is_external_suspend_with_lock
1194 1203 // it is possible that we won't see an asynchronous external suspend
1195 1204 // request that has just gotten started, i.e., SR_lock grabbed but
1196 1205 // _external_suspend field change either not made yet or not visible
1197 1206 // yet. However, this is okay because the request is asynchronous and
1198 1207 // we will see the new flag value the next time through. It's also
1199 1208 // possible that the external suspend request is dropped after
1200 1209 // we have checked is_external_suspend(), we will recheck its value
1201 1210 // under SR_lock in java_suspend_self().
1202 1211 return (_special_runtime_exit_condition != _no_async_condition) ||
1203 1212 is_external_suspend() || is_deopt_suspend();
1204 1213 }
1205 1214
1206 1215 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1207 1216
1208 1217 void set_pending_async_exception(oop e) {
1209 1218 _pending_async_exception = e;
1210 1219 _special_runtime_exit_condition = _async_exception;
1211 1220 set_has_async_exception();
1212 1221 }
1213 1222
1214 1223 // Fast-locking support
1215 1224 bool is_lock_owned(address adr) const;
1216 1225
1217 1226 // Accessors for vframe array top
1218 1227 // The linked list of vframe arrays are sorted on sp. This means when we
1219 1228 // unpack the head must contain the vframe array to unpack.
1220 1229 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1221 1230 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1222 1231
1223 1232 // Side structure for defering update of java frame locals until deopt occurs
1224 1233 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1225 1234 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1226 1235
1227 1236 // These only really exist to make debugging deopt problems simpler
1228 1237
1229 1238 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1230 1239 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1231 1240
1232 1241 // The special resourceMark used during deoptimization
1233 1242
1234 1243 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1235 1244 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1236 1245
1237 1246 intptr_t* must_deopt_id() { return _must_deopt_id; }
1238 1247 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1239 1248 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1240 1249
1241 1250 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1242 1251 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1243 1252
1244 1253 Method* callee_target() const { return _callee_target; }
1245 1254 void set_callee_target (Method* x) { _callee_target = x; }
1246 1255
1247 1256 // Oop results of vm runtime calls
1248 1257 oop vm_result() const { return _vm_result; }
1249 1258 void set_vm_result (oop x) { _vm_result = x; }
1250 1259
1251 1260 Metadata* vm_result_2() const { return _vm_result_2; }
1252 1261 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1253 1262
1254 1263 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1255 1264 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1256 1265
1257 1266 // Exception handling for compiled methods
1258 1267 oop exception_oop() const { return _exception_oop; }
1259 1268 address exception_pc() const { return _exception_pc; }
1260 1269 address exception_handler_pc() const { return _exception_handler_pc; }
1261 1270 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1262 1271
1263 1272 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1264 1273 void set_exception_pc(address a) { _exception_pc = a; }
1265 1274 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1266 1275 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1267 1276
1268 1277 void clear_exception_oop_and_pc() {
1269 1278 set_exception_oop(NULL);
1270 1279 set_exception_pc(NULL);
1271 1280 }
1272 1281
1273 1282 // Stack overflow support
1274 1283 inline size_t stack_available(address cur_sp);
1275 1284 address stack_yellow_zone_base()
1276 1285 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1277 1286 size_t stack_yellow_zone_size()
1278 1287 { return StackYellowPages * os::vm_page_size(); }
1279 1288 address stack_red_zone_base()
1280 1289 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1281 1290 size_t stack_red_zone_size()
1282 1291 { return StackRedPages * os::vm_page_size(); }
1283 1292 bool in_stack_yellow_zone(address a)
1284 1293 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1285 1294 bool in_stack_red_zone(address a)
1286 1295 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1287 1296
1288 1297 void create_stack_guard_pages();
1289 1298 void remove_stack_guard_pages();
1290 1299
1291 1300 void enable_stack_yellow_zone();
1292 1301 void disable_stack_yellow_zone();
1293 1302 void enable_stack_red_zone();
1294 1303 void disable_stack_red_zone();
1295 1304
1296 1305 inline bool stack_guard_zone_unused();
1297 1306 inline bool stack_yellow_zone_disabled();
1298 1307 inline bool stack_yellow_zone_enabled();
1299 1308
1300 1309 // Attempt to reguard the stack after a stack overflow may have occurred.
1301 1310 // Returns true if (a) guard pages are not needed on this thread, (b) the
1302 1311 // pages are already guarded, or (c) the pages were successfully reguarded.
1303 1312 // Returns false if there is not enough stack space to reguard the pages, in
1304 1313 // which case the caller should unwind a frame and try again. The argument
1305 1314 // should be the caller's (approximate) sp.
1306 1315 bool reguard_stack(address cur_sp);
1307 1316 // Similar to above but see if current stackpoint is out of the guard area
1308 1317 // and reguard if possible.
1309 1318 bool reguard_stack(void);
1310 1319
1311 1320 address stack_overflow_limit() { return _stack_overflow_limit; }
1312 1321 void set_stack_overflow_limit() {
1313 1322 _stack_overflow_limit = _stack_base - _stack_size +
1314 1323 ((StackShadowPages +
1315 1324 StackYellowPages +
1316 1325 StackRedPages) * os::vm_page_size());
1317 1326 }
1318 1327
1319 1328 // Misc. accessors/mutators
1320 1329 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1321 1330 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1322 1331 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1323 1332
1324 1333 #ifndef PRODUCT
1325 1334 void record_jump(address target, address instr, const char* file, int line);
1326 1335 #endif /* PRODUCT */
1327 1336
1328 1337 // For assembly stub generation
1329 1338 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1330 1339 #ifndef PRODUCT
1331 1340 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1332 1341 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1333 1342 #endif /* PRODUCT */
1334 1343 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1335 1344 static ByteSize last_Java_sp_offset() {
1336 1345 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1337 1346 }
1338 1347 static ByteSize last_Java_pc_offset() {
1339 1348 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1340 1349 }
1341 1350 static ByteSize frame_anchor_offset() {
1342 1351 return byte_offset_of(JavaThread, _anchor);
1343 1352 }
1344 1353 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1345 1354 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1346 1355 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1347 1356 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1348 1357 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1349 1358 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1350 1359 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1351 1360 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1352 1361 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1353 1362 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1354 1363 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1355 1364 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1356 1365 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1357 1366
1358 1367 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1359 1368 static ByteSize should_post_on_exceptions_flag_offset() {
1360 1369 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1361 1370 }
1362 1371
1363 1372 #if INCLUDE_ALL_GCS
1364 1373 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1365 1374 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1366 1375 #endif // INCLUDE_ALL_GCS
1367 1376
1368 1377 // Returns the jni environment for this thread
1369 1378 JNIEnv* jni_environment() { return &_jni_environment; }
1370 1379
1371 1380 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1372 1381 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1373 1382 // Only return NULL if thread is off the thread list; starting to
1374 1383 // exit should not return NULL.
1375 1384 if (thread_from_jni_env->is_terminated()) {
1376 1385 thread_from_jni_env->block_if_vm_exited();
1377 1386 return NULL;
1378 1387 } else {
1379 1388 return thread_from_jni_env;
1380 1389 }
1381 1390 }
1382 1391
1383 1392 // JNI critical regions. These can nest.
1384 1393 bool in_critical() { return _jni_active_critical > 0; }
1385 1394 bool in_last_critical() { return _jni_active_critical == 1; }
1386 1395 void enter_critical() { assert(Thread::current() == this ||
1387 1396 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1388 1397 "this must be current thread or synchronizing");
1389 1398 _jni_active_critical++; }
1390 1399 void exit_critical() { assert(Thread::current() == this,
1391 1400 "this must be current thread");
1392 1401 _jni_active_critical--;
1393 1402 assert(_jni_active_critical >= 0,
1394 1403 "JNI critical nesting problem?"); }
1395 1404
1396 1405 // For deadlock detection
1397 1406 int depth_first_number() { return _depth_first_number; }
1398 1407 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1399 1408
1400 1409 private:
1401 1410 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1402 1411
1403 1412 public:
1404 1413 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1405 1414 void add_monitor_chunk(MonitorChunk* chunk);
1406 1415 void remove_monitor_chunk(MonitorChunk* chunk);
1407 1416 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1408 1417 void inc_in_deopt_handler() { _in_deopt_handler++; }
1409 1418 void dec_in_deopt_handler() {
1410 1419 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1411 1420 if (_in_deopt_handler > 0) { // robustness
1412 1421 _in_deopt_handler--;
1413 1422 }
1414 1423 }
1415 1424
1416 1425 private:
1417 1426 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1418 1427
1419 1428 public:
1420 1429
1421 1430 // Frame iteration; calls the function f for all frames on the stack
1422 1431 void frames_do(void f(frame*, const RegisterMap*));
1423 1432
1424 1433 // Memory operations
1425 1434 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1426 1435
1427 1436 // Sweeper operations
1428 1437 void nmethods_do(CodeBlobClosure* cf);
1429 1438
1430 1439 // RedefineClasses Support
1431 1440 void metadata_do(void f(Metadata*));
1432 1441
1433 1442 // Memory management operations
1434 1443 void gc_epilogue();
1435 1444 void gc_prologue();
1436 1445
1437 1446 // Misc. operations
1438 1447 char* name() const { return (char*)get_thread_name(); }
1439 1448 void print_on(outputStream* st) const;
1440 1449 void print() const { print_on(tty); }
1441 1450 void print_value();
1442 1451 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1443 1452 void print_thread_state() const PRODUCT_RETURN;
1444 1453 void print_on_error(outputStream* st, char* buf, int buflen) const;
1445 1454 void verify();
1446 1455 const char* get_thread_name() const;
1447 1456 private:
1448 1457 // factor out low-level mechanics for use in both normal and error cases
1449 1458 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1450 1459 public:
1451 1460 const char* get_threadgroup_name() const;
1452 1461 const char* get_parent_name() const;
1453 1462
1454 1463 // Accessing frames
1455 1464 frame last_frame() {
1456 1465 _anchor.make_walkable(this);
1457 1466 return pd_last_frame();
1458 1467 }
1459 1468 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1460 1469
1461 1470 // Returns method at 'depth' java or native frames down the stack
1462 1471 // Used for security checks
1463 1472 Klass* security_get_caller_class(int depth);
1464 1473
1465 1474 // Print stack trace in external format
1466 1475 void print_stack_on(outputStream* st);
1467 1476 void print_stack() { print_stack_on(tty); }
1468 1477
1469 1478 // Print stack traces in various internal formats
1470 1479 void trace_stack() PRODUCT_RETURN;
1471 1480 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1472 1481 void trace_frames() PRODUCT_RETURN;
1473 1482 void trace_oops() PRODUCT_RETURN;
1474 1483
1475 1484 // Print an annotated view of the stack frames
1476 1485 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1477 1486 void validate_frame_layout() {
1478 1487 print_frame_layout(0, true);
1479 1488 }
1480 1489
1481 1490 // Returns the number of stack frames on the stack
1482 1491 int depth() const;
1483 1492
1484 1493 // Function for testing deoptimization
1485 1494 void deoptimize();
1486 1495 void make_zombies();
1487 1496
1488 1497 void deoptimized_wrt_marked_nmethods();
1489 1498
1490 1499 // Profiling operation (see fprofile.cpp)
1491 1500 public:
1492 1501 bool profile_last_Java_frame(frame* fr);
1493 1502
1494 1503 private:
1495 1504 ThreadProfiler* _thread_profiler;
1496 1505 private:
1497 1506 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1498 1507 friend class FlatProfilerTask; // uses get_thread_profiler.
1499 1508 friend class ThreadProfilerMark; // uses get_thread_profiler.
1500 1509 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1501 1510 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1502 1511 ThreadProfiler* result = _thread_profiler;
1503 1512 _thread_profiler = tp;
1504 1513 return result;
1505 1514 }
1506 1515
1507 1516 public:
1508 1517 // Returns the running thread as a JavaThread
1509 1518 static inline JavaThread* current();
1510 1519
1511 1520 // Returns the active Java thread. Do not use this if you know you are calling
1512 1521 // from a JavaThread, as it's slower than JavaThread::current. If called from
1513 1522 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1514 1523 // operation. You may not want that either.
1515 1524 static JavaThread* active();
1516 1525
1517 1526 inline CompilerThread* as_CompilerThread();
1518 1527
1519 1528 public:
1520 1529 virtual void run();
1521 1530 void thread_main_inner();
1522 1531
1523 1532 private:
1524 1533 // PRIVILEGED STACK
1525 1534 PrivilegedElement* _privileged_stack_top;
1526 1535 GrowableArray<oop>* _array_for_gc;
1527 1536 public:
1528 1537
1529 1538 // Returns the privileged_stack information.
1530 1539 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1531 1540 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1532 1541 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1533 1542
1534 1543 public:
1535 1544 // Thread local information maintained by JVMTI.
1536 1545 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1537 1546 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1538 1547 // getter is used to get this JavaThread's JvmtiThreadState if it has
1539 1548 // one which means NULL can be returned. JvmtiThreadState::state_for()
1540 1549 // is used to get the specified JavaThread's JvmtiThreadState if it has
1541 1550 // one or it allocates a new JvmtiThreadState for the JavaThread and
1542 1551 // returns it. JvmtiThreadState::state_for() will return NULL only if
1543 1552 // the specified JavaThread is exiting.
1544 1553 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1545 1554 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1546 1555 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1547 1556 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1548 1557
1549 1558 // JVMTI PopFrame support
1550 1559 // Setting and clearing popframe_condition
1551 1560 // All of these enumerated values are bits. popframe_pending
1552 1561 // indicates that a PopFrame() has been requested and not yet been
1553 1562 // completed. popframe_processing indicates that that PopFrame() is in
1554 1563 // the process of being completed. popframe_force_deopt_reexecution_bit
1555 1564 // indicates that special handling is required when returning to a
1556 1565 // deoptimized caller.
1557 1566 enum PopCondition {
1558 1567 popframe_inactive = 0x00,
1559 1568 popframe_pending_bit = 0x01,
1560 1569 popframe_processing_bit = 0x02,
1561 1570 popframe_force_deopt_reexecution_bit = 0x04
1562 1571 };
1563 1572 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1564 1573 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1565 1574 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1566 1575 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1567 1576 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1568 1577 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1569 1578 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1570 1579 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1571 1580 #ifdef CC_INTERP
1572 1581 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1573 1582 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1574 1583 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1575 1584 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1576 1585 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1577 1586 #endif
1578 1587
1579 1588 private:
1580 1589 // Saved incoming arguments to popped frame.
1581 1590 // Used only when popped interpreted frame returns to deoptimized frame.
1582 1591 void* _popframe_preserved_args;
1583 1592 int _popframe_preserved_args_size;
1584 1593
1585 1594 public:
1586 1595 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1587 1596 void* popframe_preserved_args();
1588 1597 ByteSize popframe_preserved_args_size();
1589 1598 WordSize popframe_preserved_args_size_in_words();
1590 1599 void popframe_free_preserved_args();
1591 1600
1592 1601
1593 1602 private:
1594 1603 JvmtiThreadState *_jvmti_thread_state;
1595 1604 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1596 1605
1597 1606 // Used by the interpreter in fullspeed mode for frame pop, method
1598 1607 // entry, method exit and single stepping support. This field is
1599 1608 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1600 1609 // It can be set to zero asynchronously (i.e., without a VM operation
1601 1610 // or a lock) so we have to be very careful.
1602 1611 int _interp_only_mode;
1603 1612
1604 1613 public:
1605 1614 // used by the interpreter for fullspeed debugging support (see above)
1606 1615 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1607 1616 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1608 1617 int get_interp_only_mode() { return _interp_only_mode; }
1609 1618 void increment_interp_only_mode() { ++_interp_only_mode; }
1610 1619 void decrement_interp_only_mode() { --_interp_only_mode; }
1611 1620
1612 1621 // support for cached flag that indicates whether exceptions need to be posted for this thread
1613 1622 // if this is false, we can avoid deoptimizing when events are thrown
1614 1623 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1615 1624 private:
1616 1625 int _should_post_on_exceptions_flag;
1617 1626
1618 1627 public:
1619 1628 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1620 1629 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1621 1630
1622 1631 private:
1623 1632 ThreadStatistics *_thread_stat;
1624 1633
1625 1634 public:
1626 1635 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1627 1636
1628 1637 // Return a blocker object for which this thread is blocked parking.
1629 1638 oop current_park_blocker();
1630 1639
1631 1640 private:
1632 1641 static size_t _stack_size_at_create;
1633 1642
1634 1643 public:
1635 1644 static inline size_t stack_size_at_create(void) {
1636 1645 return _stack_size_at_create;
1637 1646 }
1638 1647 static inline void set_stack_size_at_create(size_t value) {
1639 1648 _stack_size_at_create = value;
1640 1649 }
1641 1650
1642 1651 #if INCLUDE_ALL_GCS
1643 1652 // SATB marking queue support
1644 1653 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1645 1654 static SATBMarkQueueSet& satb_mark_queue_set() {
1646 1655 return _satb_mark_queue_set;
1647 1656 }
1648 1657
1649 1658 // Dirty card queue support
1650 1659 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1651 1660 static DirtyCardQueueSet& dirty_card_queue_set() {
1652 1661 return _dirty_card_queue_set;
1653 1662 }
1654 1663 #endif // INCLUDE_ALL_GCS
1655 1664
1656 1665 // This method initializes the SATB and dirty card queues before a
1657 1666 // JavaThread is added to the Java thread list. Right now, we don't
1658 1667 // have to do anything to the dirty card queue (it should have been
1659 1668 // activated when the thread was created), but we have to activate
1660 1669 // the SATB queue if the thread is created while a marking cycle is
1661 1670 // in progress. The activation / de-activation of the SATB queues at
1662 1671 // the beginning / end of a marking cycle is done during safepoints
1663 1672 // so we have to make sure this method is called outside one to be
1664 1673 // able to safely read the active field of the SATB queue set. Right
1665 1674 // now, it is called just before the thread is added to the Java
1666 1675 // thread list in the Threads::add() method. That method is holding
1667 1676 // the Threads_lock which ensures we are outside a safepoint. We
1668 1677 // cannot do the obvious and set the active field of the SATB queue
1669 1678 // when the thread is created given that, in some cases, safepoints
1670 1679 // might happen between the JavaThread constructor being called and the
1671 1680 // thread being added to the Java thread list (an example of this is
1672 1681 // when the structure for the DestroyJavaVM thread is created).
1673 1682 #if INCLUDE_ALL_GCS
1674 1683 void initialize_queues();
1675 1684 #else // INCLUDE_ALL_GCS
1676 1685 void initialize_queues() { }
1677 1686 #endif // INCLUDE_ALL_GCS
1678 1687
1679 1688 // Machine dependent stuff
1680 1689 #ifdef TARGET_OS_ARCH_linux_x86
1681 1690 # include "thread_linux_x86.hpp"
1682 1691 #endif
1683 1692 #ifdef TARGET_OS_ARCH_linux_sparc
1684 1693 # include "thread_linux_sparc.hpp"
1685 1694 #endif
1686 1695 #ifdef TARGET_OS_ARCH_linux_zero
1687 1696 # include "thread_linux_zero.hpp"
1688 1697 #endif
1689 1698 #ifdef TARGET_OS_ARCH_solaris_x86
1690 1699 # include "thread_solaris_x86.hpp"
1691 1700 #endif
1692 1701 #ifdef TARGET_OS_ARCH_solaris_sparc
1693 1702 # include "thread_solaris_sparc.hpp"
1694 1703 #endif
1695 1704 #ifdef TARGET_OS_ARCH_windows_x86
1696 1705 # include "thread_windows_x86.hpp"
1697 1706 #endif
1698 1707 #ifdef TARGET_OS_ARCH_linux_arm
1699 1708 # include "thread_linux_arm.hpp"
1700 1709 #endif
1701 1710 #ifdef TARGET_OS_ARCH_linux_ppc
1702 1711 # include "thread_linux_ppc.hpp"
1703 1712 #endif
1704 1713 #ifdef TARGET_OS_ARCH_aix_ppc
1705 1714 # include "thread_aix_ppc.hpp"
1706 1715 #endif
1707 1716 #ifdef TARGET_OS_ARCH_bsd_x86
1708 1717 # include "thread_bsd_x86.hpp"
1709 1718 #endif
1710 1719 #ifdef TARGET_OS_ARCH_bsd_zero
1711 1720 # include "thread_bsd_zero.hpp"
1712 1721 #endif
1713 1722
1714 1723
1715 1724 public:
1716 1725 void set_blocked_on_compilation(bool value) {
1717 1726 _blocked_on_compilation = value;
1718 1727 }
1719 1728
1720 1729 bool blocked_on_compilation() {
1721 1730 return _blocked_on_compilation;
1722 1731 }
1723 1732 protected:
1724 1733 bool _blocked_on_compilation;
1725 1734
1726 1735
1727 1736 // JSR166 per-thread parker
1728 1737 private:
1729 1738 Parker* _parker;
1730 1739 public:
1731 1740 Parker* parker() { return _parker; }
1732 1741
1733 1742 // Biased locking support
1734 1743 private:
1735 1744 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1736 1745 public:
1737 1746 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1738 1747 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1739 1748
1740 1749 // clearing/querying jni attach status
1741 1750 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1742 1751 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1743 1752 inline void set_done_attaching_via_jni();
1744 1753 private:
1745 1754 // This field is used to determine if a thread has claimed
1746 1755 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1747 1756 // otherwise its value is the par_id that has been claimed.
1748 1757 uint _claimed_par_id;
1749 1758 public:
1750 1759 uint get_claimed_par_id() { return _claimed_par_id; }
1751 1760 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1752 1761 };
1753 1762
1754 1763 // Inline implementation of JavaThread::current
1755 1764 inline JavaThread* JavaThread::current() {
1756 1765 Thread* thread = ThreadLocalStorage::thread();
1757 1766 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1758 1767 return (JavaThread*)thread;
1759 1768 }
1760 1769
1761 1770 inline CompilerThread* JavaThread::as_CompilerThread() {
1762 1771 assert(is_Compiler_thread(), "just checking");
1763 1772 return (CompilerThread*)this;
1764 1773 }
1765 1774
1766 1775 inline bool JavaThread::stack_guard_zone_unused() {
1767 1776 return _stack_guard_state == stack_guard_unused;
1768 1777 }
1769 1778
1770 1779 inline bool JavaThread::stack_yellow_zone_disabled() {
1771 1780 return _stack_guard_state == stack_guard_yellow_disabled;
1772 1781 }
1773 1782
1774 1783 inline bool JavaThread::stack_yellow_zone_enabled() {
1775 1784 #ifdef ASSERT
1776 1785 if (os::uses_stack_guard_pages()) {
1777 1786 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1778 1787 }
1779 1788 #endif
1780 1789 return _stack_guard_state == stack_guard_enabled;
1781 1790 }
1782 1791
1783 1792 inline size_t JavaThread::stack_available(address cur_sp) {
1784 1793 // This code assumes java stacks grow down
1785 1794 address low_addr; // Limit on the address for deepest stack depth
1786 1795 if ( _stack_guard_state == stack_guard_unused) {
1787 1796 low_addr = stack_base() - stack_size();
1788 1797 } else {
1789 1798 low_addr = stack_yellow_zone_base();
1790 1799 }
1791 1800 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1792 1801 }
1793 1802
1794 1803 // A thread used for Compilation.
1795 1804 class CompilerThread : public JavaThread {
1796 1805 friend class VMStructs;
1797 1806 private:
1798 1807 CompilerCounters* _counters;
1799 1808
1800 1809 ciEnv* _env;
1801 1810 CompileLog* _log;
1802 1811 CompileTask* _task;
1803 1812 CompileQueue* _queue;
1804 1813 BufferBlob* _buffer_blob;
1805 1814
1806 1815 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1807 1816 AbstractCompiler* _compiler;
1808 1817
1809 1818 public:
1810 1819
1811 1820 static CompilerThread* current();
1812 1821
1813 1822 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1814 1823
1815 1824 bool is_Compiler_thread() const { return true; }
1816 1825 // Hide this compiler thread from external view.
1817 1826 bool is_hidden_from_external_view() const { return true; }
1818 1827
1819 1828 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1820 1829 AbstractCompiler* compiler() const { return _compiler; }
1821 1830
1822 1831 CompileQueue* queue() const { return _queue; }
1823 1832 CompilerCounters* counters() const { return _counters; }
1824 1833
1825 1834 // Get/set the thread's compilation environment.
1826 1835 ciEnv* env() { return _env; }
1827 1836 void set_env(ciEnv* env) { _env = env; }
1828 1837
1829 1838 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1830 1839 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1831 1840
1832 1841 // Get/set the thread's logging information
1833 1842 CompileLog* log() { return _log; }
1834 1843 void init_log(CompileLog* log) {
1835 1844 // Set once, for good.
1836 1845 assert(_log == NULL, "set only once");
1837 1846 _log = log;
1838 1847 }
1839 1848
1840 1849 // GC support
1841 1850 // Apply "f->do_oop" to all root oops in "this".
1842 1851 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1843 1852 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1844 1853
1845 1854 #ifndef PRODUCT
1846 1855 private:
1847 1856 IdealGraphPrinter *_ideal_graph_printer;
1848 1857 public:
1849 1858 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1850 1859 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1851 1860 #endif
1852 1861
1853 1862 // Get/set the thread's current task
1854 1863 CompileTask* task() { return _task; }
1855 1864 void set_task(CompileTask* task) { _task = task; }
1856 1865
1857 1866 // Track the nmethod currently being scanned by the sweeper
1858 1867 void set_scanned_nmethod(nmethod* nm) {
1859 1868 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1860 1869 _scanned_nmethod = nm;
1861 1870 }
1862 1871 };
1863 1872
1864 1873 inline CompilerThread* CompilerThread::current() {
1865 1874 return JavaThread::current()->as_CompilerThread();
1866 1875 }
1867 1876
1868 1877
1869 1878 // The active thread queue. It also keeps track of the current used
1870 1879 // thread priorities.
1871 1880 class Threads: AllStatic {
1872 1881 friend class VMStructs;
1873 1882 private:
1874 1883 static JavaThread* _thread_list;
1875 1884 static int _number_of_threads;
1876 1885 static int _number_of_non_daemon_threads;
1877 1886 static int _return_code;
1878 1887 #ifdef ASSERT
1879 1888 static bool _vm_complete;
1880 1889 #endif
1881 1890
1882 1891 public:
1883 1892 // Thread management
1884 1893 // force_daemon is a concession to JNI, where we may need to add a
1885 1894 // thread to the thread list before allocating its thread object
1886 1895 static void add(JavaThread* p, bool force_daemon = false);
1887 1896 static void remove(JavaThread* p);
1888 1897 static bool includes(JavaThread* p);
1889 1898 static JavaThread* first() { return _thread_list; }
1890 1899 static void threads_do(ThreadClosure* tc);
1891 1900
1892 1901 // Initializes the vm and creates the vm thread
1893 1902 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1894 1903 static void convert_vm_init_libraries_to_agents();
1895 1904 static void create_vm_init_libraries();
1896 1905 static void create_vm_init_agents();
1897 1906 static void shutdown_vm_agents();
1898 1907 static bool destroy_vm();
1899 1908 // Supported VM versions via JNI
1900 1909 // Includes JNI_VERSION_1_1
1901 1910 static jboolean is_supported_jni_version_including_1_1(jint version);
1902 1911 // Does not include JNI_VERSION_1_1
1903 1912 static jboolean is_supported_jni_version(jint version);
1904 1913
1905 1914 // Garbage collection
1906 1915 static void follow_other_roots(void f(oop*));
1907 1916
1908 1917 // Apply "f->do_oop" to all root oops in all threads.
1909 1918 // This version may only be called by sequential code.
1910 1919 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1911 1920 // This version may be called by sequential or parallel code.
1912 1921 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1913 1922 // This creates a list of GCTasks, one per thread.
1914 1923 static void create_thread_roots_tasks(GCTaskQueue* q);
1915 1924 // This creates a list of GCTasks, one per thread, for marking objects.
1916 1925 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1917 1926
1918 1927 // Apply "f->do_oop" to roots in all threads that
1919 1928 // are part of compiled frames
1920 1929 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1921 1930
1922 1931 static void convert_hcode_pointers();
1923 1932 static void restore_hcode_pointers();
1924 1933
1925 1934 // Sweeper
1926 1935 static void nmethods_do(CodeBlobClosure* cf);
1927 1936
1928 1937 // RedefineClasses support
1929 1938 static void metadata_do(void f(Metadata*));
1930 1939
1931 1940 static void gc_epilogue();
1932 1941 static void gc_prologue();
1933 1942 #ifdef ASSERT
1934 1943 static bool is_vm_complete() { return _vm_complete; }
1935 1944 #endif
1936 1945
1937 1946 // Verification
1938 1947 static void verify();
1939 1948 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1940 1949 static void print(bool print_stacks, bool internal_format) {
1941 1950 // this function is only used by debug.cpp
1942 1951 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1943 1952 }
1944 1953 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1945 1954
1946 1955 // Get Java threads that are waiting to enter a monitor. If doLock
1947 1956 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1948 1957 // VM needs to be at a safepoint.
1949 1958 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1950 1959 address monitor, bool doLock);
1951 1960
1952 1961 // Get owning Java thread from the monitor's owner field. If doLock
1953 1962 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1954 1963 // VM needs to be at a safepoint.
1955 1964 static JavaThread *owning_thread_from_monitor_owner(address owner,
1956 1965 bool doLock);
1957 1966
1958 1967 // Number of threads on the active threads list
1959 1968 static int number_of_threads() { return _number_of_threads; }
1960 1969 // Number of non-daemon threads on the active threads list
1961 1970 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1962 1971
1963 1972 // Deoptimizes all frames tied to marked nmethods
1964 1973 static void deoptimized_wrt_marked_nmethods();
1965 1974
1966 1975 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
1967 1976
1968 1977 };
1969 1978
1970 1979
1971 1980 // Thread iterator
1972 1981 class ThreadClosure: public StackObj {
1973 1982 public:
1974 1983 virtual void do_thread(Thread* thread) = 0;
1975 1984 };
1976 1985
1977 1986 class SignalHandlerMark: public StackObj {
1978 1987 private:
1979 1988 Thread* _thread;
1980 1989 public:
1981 1990 SignalHandlerMark(Thread* t) {
1982 1991 _thread = t;
1983 1992 if (_thread) _thread->enter_signal_handler();
1984 1993 }
1985 1994 ~SignalHandlerMark() {
1986 1995 if (_thread) _thread->leave_signal_handler();
1987 1996 _thread = NULL;
1988 1997 }
1989 1998 };
1990 1999
1991 2000
1992 2001 #endif // SHARE_VM_RUNTIME_THREAD_HPP
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