Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.hpp @ 609:ea20d7ce26b0
6800721: 3/4 JavaThread::jvmti_thread_state() and JvmtiThreadState::state_for() robustness
Summary: Check for NULL return values from jvmti_thread_state() and state_for() and return a JVM TI error code as appropriate.
Reviewed-by: coleenp, swamyv
| author | dcubed |
|---|---|
| date | Mon, 02 Mar 2009 14:00:23 -0700 |
| parents | ad8c8ca4ab0f |
| children | b9fba36710f2 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 470 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 class ThreadSafepointState; | |
| 26 class ThreadProfiler; | |
| 27 | |
| 28 class JvmtiThreadState; | |
| 29 class JvmtiGetLoadedClassesClosure; | |
| 30 class ThreadStatistics; | |
| 31 class ConcurrentLocksDump; | |
| 32 class ParkEvent ; | |
| 33 | |
| 34 class ciEnv; | |
| 35 class CompileThread; | |
| 36 class CompileLog; | |
| 37 class CompileTask; | |
| 38 class CompileQueue; | |
| 39 class CompilerCounters; | |
| 40 class vframeArray; | |
| 41 | |
| 42 class DeoptResourceMark; | |
| 43 class jvmtiDeferredLocalVariableSet; | |
| 44 | |
| 45 class GCTaskQueue; | |
| 46 class ThreadClosure; | |
| 47 class IdealGraphPrinter; | |
| 48 | |
| 49 // Class hierarchy | |
| 50 // - Thread | |
| 51 // - VMThread | |
| 52 // - JavaThread | |
| 53 // - WatcherThread | |
| 54 | |
| 55 class Thread: public ThreadShadow { | |
| 56 friend class VMStructs; | |
| 57 private: | |
| 58 // Exception handling | |
| 59 // (Note: _pending_exception and friends are in ThreadShadow) | |
| 60 //oop _pending_exception; // pending exception for current thread | |
| 61 // const char* _exception_file; // file information for exception (debugging only) | |
| 62 // int _exception_line; // line information for exception (debugging only) | |
| 63 | |
| 64 // Support for forcing alignment of thread objects for biased locking | |
| 65 void* _real_malloc_address; | |
| 66 public: | |
| 67 void* operator new(size_t size); | |
| 68 void operator delete(void* p); | |
| 69 private: | |
| 70 | |
| 71 // *************************************************************** | |
| 72 // Suspend and resume support | |
| 73 // *************************************************************** | |
| 74 // | |
| 75 // VM suspend/resume no longer exists - it was once used for various | |
| 76 // things including safepoints but was deprecated and finally removed | |
| 77 // in Java 7. Because VM suspension was considered "internal" Java-level | |
| 78 // suspension was considered "external", and this legacy naming scheme | |
| 79 // remains. | |
| 80 // | |
| 81 // External suspend/resume requests come from JVM_SuspendThread, | |
| 82 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
| 83 // ResumeThread. External | |
| 84 // suspend requests cause _external_suspend to be set and external | |
| 85 // resume requests cause _external_suspend to be cleared. | |
| 86 // External suspend requests do not nest on top of other external | |
| 87 // suspend requests. The higher level APIs reject suspend requests | |
| 88 // for already suspended threads. | |
| 89 // | |
| 90 // The external_suspend | |
| 91 // flag is checked by has_special_runtime_exit_condition() and java thread | |
| 92 // will self-suspend when handle_special_runtime_exit_condition() is | |
| 93 // called. Most uses of the _thread_blocked state in JavaThreads are | |
| 94 // considered the same as being externally suspended; if the blocking | |
| 95 // condition lifts, the JavaThread will self-suspend. Other places | |
| 96 // where VM checks for external_suspend include: | |
| 97 // + mutex granting (do not enter monitors when thread is suspended) | |
| 98 // + state transitions from _thread_in_native | |
| 99 // | |
| 100 // In general, java_suspend() does not wait for an external suspend | |
| 101 // request to complete. When it returns, the only guarantee is that | |
| 102 // the _external_suspend field is true. | |
| 103 // | |
| 104 // wait_for_ext_suspend_completion() is used to wait for an external | |
| 105 // suspend request to complete. External suspend requests are usually | |
| 106 // followed by some other interface call that requires the thread to | |
| 107 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
| 108 // the interface that requires quiescence, we give the JavaThread a | |
| 109 // chance to self-suspend before we need it to be quiescent. This | |
| 110 // improves overall suspend/query performance. | |
| 111 // | |
| 112 // _suspend_flags controls the behavior of java_ suspend/resume. | |
| 113 // It must be set under the protection of SR_lock. Read from the flag is | |
| 114 // OK without SR_lock as long as the value is only used as a hint. | |
| 115 // (e.g., check _external_suspend first without lock and then recheck | |
| 116 // inside SR_lock and finish the suspension) | |
| 117 // | |
| 118 // _suspend_flags is also overloaded for other "special conditions" so | |
| 119 // that a single check indicates whether any special action is needed | |
| 120 // eg. for async exceptions. | |
| 121 // ------------------------------------------------------------------- | |
| 122 // Notes: | |
| 123 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
| 124 // but we still update its value to keep other part of the system (mainly | |
| 125 // JVMTI) happy. ThreadState is legacy code (see notes in | |
| 126 // osThread.hpp). | |
| 127 // | |
| 128 // 2. It would be more natural if set_external_suspend() is private and | |
| 129 // part of java_suspend(), but that probably would affect the suspend/query | |
| 130 // performance. Need more investigation on this. | |
| 131 // | |
| 132 | |
| 133 // suspend/resume lock: used for self-suspend | |
| 134 Monitor* _SR_lock; | |
| 135 | |
| 136 protected: | |
| 137 enum SuspendFlags { | |
| 138 // NOTE: avoid using the sign-bit as cc generates different test code | |
| 139 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
| 140 | |
| 141 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
| 142 _ext_suspended = 0x40000000U, // thread has self-suspended | |
| 143 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
| 144 | |
| 145 _has_async_exception = 0x00000001U // there is a pending async exception | |
| 146 }; | |
| 147 | |
| 148 // various suspension related flags - atomically updated | |
| 149 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
| 150 volatile uint32_t _suspend_flags; | |
| 151 | |
| 152 private: | |
| 153 int _num_nested_signal; | |
| 154 | |
| 155 public: | |
| 156 void enter_signal_handler() { _num_nested_signal++; } | |
| 157 void leave_signal_handler() { _num_nested_signal--; } | |
| 158 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } | |
| 159 | |
| 160 private: | |
| 161 // Debug tracing | |
| 162 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
| 163 | |
| 164 // Active_handles points to a block of handles | |
| 165 JNIHandleBlock* _active_handles; | |
| 166 | |
| 167 // One-element thread local free list | |
| 168 JNIHandleBlock* _free_handle_block; | |
| 169 | |
| 170 // Point to the last handle mark | |
| 171 HandleMark* _last_handle_mark; | |
| 172 | |
| 173 // The parity of the last strong_roots iteration in which this thread was | |
| 174 // claimed as a task. | |
| 175 jint _oops_do_parity; | |
| 176 | |
| 177 public: | |
| 178 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
| 179 HandleMark* last_handle_mark() const { return _last_handle_mark; } | |
| 180 private: | |
| 181 | |
| 182 // debug support for checking if code does allow safepoints or not | |
| 183 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
| 184 // mutex, or blocking on an object synchronizer (Java locking). | |
| 185 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
| 186 // If !allow_allocation(), then an assertion failure will happen during allocation | |
| 187 // (Hence, !allow_safepoint() => !allow_allocation()). | |
| 188 // | |
| 189 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
| 190 // | |
| 191 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen | |
| 192 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. | |
| 193 | |
| 194 // Record when GC is locked out via the GC_locker mechanism | |
| 195 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) | |
| 196 | |
| 197 friend class No_Alloc_Verifier; | |
| 198 friend class No_Safepoint_Verifier; | |
| 199 friend class Pause_No_Safepoint_Verifier; | |
| 200 friend class ThreadLocalStorage; | |
| 201 friend class GC_locker; | |
| 202 | |
| 203 // In order for all threads to be able to use fast locking, we need to know the highest stack | |
| 204 // address of where a lock is on the stack (stacks normally grow towards lower addresses). This | |
| 205 // variable is initially set to NULL, indicating no locks are used by the thread. During the thread's | |
| 206 // execution, it will be set whenever locking can happen, i.e., when we call out to Java code or use | |
| 207 // an ObjectLocker. The value is never decreased, hence, it will over the lifetime of a thread | |
| 208 // approximate the real stackbase. | |
| 209 address _highest_lock; // Highest stack address where a JavaLock exist | |
| 210 | |
| 211 ThreadLocalAllocBuffer _tlab; // Thread-local eden | |
| 212 | |
| 213 int _vm_operation_started_count; // VM_Operation support | |
| 214 int _vm_operation_completed_count; // VM_Operation support | |
| 215 | |
| 216 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread | |
| 217 // is waiting to lock | |
| 218 bool _current_pending_monitor_is_from_java; // locking is from Java code | |
| 219 | |
| 220 // ObjectMonitor on which this thread called Object.wait() | |
| 221 ObjectMonitor* _current_waiting_monitor; | |
| 222 | |
| 223 // Private thread-local objectmonitor list - a simple cache organized as a SLL. | |
| 224 public: | |
| 225 ObjectMonitor * omFreeList ; | |
| 226 int omFreeCount ; // length of omFreeList | |
| 227 int omFreeProvision ; // reload chunk size | |
| 228 | |
| 229 public: | |
| 230 enum { | |
| 231 is_definitely_current_thread = true | |
| 232 }; | |
| 233 | |
| 234 // Constructor | |
| 235 Thread(); | |
| 236 virtual ~Thread(); | |
| 237 | |
| 238 // initializtion | |
| 239 void initialize_thread_local_storage(); | |
| 240 | |
| 241 // thread entry point | |
| 242 virtual void run(); | |
| 243 | |
| 244 // Testers | |
| 245 virtual bool is_VM_thread() const { return false; } | |
| 246 virtual bool is_Java_thread() const { return false; } | |
| 247 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 248 virtual bool is_Compiler_thread() const { return false; } | |
| 249 virtual bool is_hidden_from_external_view() const { return false; } | |
| 250 virtual bool is_jvmti_agent_thread() const { return false; } | |
| 251 // True iff the thread can perform GC operations at a safepoint. | |
| 252 // Generally will be true only of VM thread and parallel GC WorkGang | |
| 253 // threads. | |
| 254 virtual bool is_GC_task_thread() const { return false; } | |
| 255 virtual bool is_Watcher_thread() const { return false; } | |
| 256 virtual bool is_ConcurrentGC_thread() const { return false; } | |
| 257 | |
| 258 virtual char* name() const { return (char*)"Unknown thread"; } | |
| 259 | |
| 260 // Returns the current thread | |
| 261 static inline Thread* current(); | |
| 262 | |
| 263 // Common thread operations | |
| 264 static void set_priority(Thread* thread, ThreadPriority priority); | |
| 265 static ThreadPriority get_priority(const Thread* const thread); | |
| 266 static void start(Thread* thread); | |
| 267 static void interrupt(Thread* thr); | |
| 268 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
| 269 | |
| 270 Monitor* SR_lock() const { return _SR_lock; } | |
| 271 | |
| 272 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
| 273 | |
| 274 void set_suspend_flag(SuspendFlags f) { | |
| 275 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 276 uint32_t flags; | |
| 277 do { | |
| 278 flags = _suspend_flags; | |
| 279 } | |
| 280 while (Atomic::cmpxchg((jint)(flags | f), | |
| 281 (volatile jint*)&_suspend_flags, | |
| 282 (jint)flags) != (jint)flags); | |
| 283 } | |
| 284 void clear_suspend_flag(SuspendFlags f) { | |
| 285 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 286 uint32_t flags; | |
| 287 do { | |
| 288 flags = _suspend_flags; | |
| 289 } | |
| 290 while (Atomic::cmpxchg((jint)(flags & ~f), | |
| 291 (volatile jint*)&_suspend_flags, | |
| 292 (jint)flags) != (jint)flags); | |
| 293 } | |
| 294 | |
| 295 void set_has_async_exception() { | |
| 296 set_suspend_flag(_has_async_exception); | |
| 297 } | |
| 298 void clear_has_async_exception() { | |
| 299 clear_suspend_flag(_has_async_exception); | |
| 300 } | |
| 301 | |
| 302 // Support for Unhandled Oop detection | |
| 303 #ifdef CHECK_UNHANDLED_OOPS | |
| 304 private: | |
| 305 UnhandledOops *_unhandled_oops; | |
| 306 public: | |
| 307 UnhandledOops* unhandled_oops() { return _unhandled_oops; } | |
| 308 // Mark oop safe for gc. It may be stack allocated but won't move. | |
| 309 void allow_unhandled_oop(oop *op) { | |
| 310 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); | |
| 311 } | |
| 312 // Clear oops at safepoint so crashes point to unhandled oop violator | |
| 313 void clear_unhandled_oops() { | |
| 314 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); | |
| 315 } | |
| 316 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
| 317 #endif // CHECK_UNHANDLED_OOPS | |
| 318 | |
| 319 public: | |
| 320 // Installs a pending exception to be inserted later | |
| 321 static void send_async_exception(oop thread_oop, oop java_throwable); | |
| 322 | |
| 323 // Resource area | |
| 324 ResourceArea* resource_area() const { return _resource_area; } | |
| 325 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
| 326 | |
| 327 OSThread* osthread() const { return _osthread; } | |
| 328 void set_osthread(OSThread* thread) { _osthread = thread; } | |
| 329 | |
| 330 // JNI handle support | |
| 331 JNIHandleBlock* active_handles() const { return _active_handles; } | |
| 332 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
| 333 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
| 334 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
| 335 | |
| 336 // Internal handle support | |
| 337 HandleArea* handle_area() const { return _handle_area; } | |
| 338 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
| 339 | |
| 340 // Thread-Local Allocation Buffer (TLAB) support | |
| 341 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
| 342 void initialize_tlab() { | |
| 343 if (UseTLAB) { | |
| 344 tlab().initialize(); | |
| 345 } | |
| 346 } | |
| 347 | |
| 348 // VM operation support | |
| 349 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
| 350 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
| 351 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
| 352 | |
| 353 // For tracking the heavyweight monitor the thread is pending on. | |
| 354 ObjectMonitor* current_pending_monitor() { | |
| 355 return _current_pending_monitor; | |
| 356 } | |
| 357 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
| 358 _current_pending_monitor = monitor; | |
| 359 } | |
| 360 void set_current_pending_monitor_is_from_java(bool from_java) { | |
| 361 _current_pending_monitor_is_from_java = from_java; | |
| 362 } | |
| 363 bool current_pending_monitor_is_from_java() { | |
| 364 return _current_pending_monitor_is_from_java; | |
| 365 } | |
| 366 | |
| 367 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
| 368 ObjectMonitor* current_waiting_monitor() { | |
| 369 return _current_waiting_monitor; | |
| 370 } | |
| 371 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
| 372 _current_waiting_monitor = monitor; | |
| 373 } | |
| 374 | |
| 375 // GC support | |
| 376 // Apply "f->do_oop" to all root oops in "this". | |
| 377 void oops_do(OopClosure* f); | |
| 378 | |
| 379 // Handles the parallel case for the method below. | |
| 380 private: | |
| 381 bool claim_oops_do_par_case(int collection_parity); | |
| 382 public: | |
| 383 // Requires that "collection_parity" is that of the current strong roots | |
| 384 // iteration. If "is_par" is false, sets the parity of "this" to | |
| 385 // "collection_parity", and returns "true". If "is_par" is true, | |
| 386 // uses an atomic instruction to set the current threads parity to | |
| 387 // "collection_parity", if it is not already. Returns "true" iff the | |
| 388 // calling thread does the update, this indicates that the calling thread | |
| 389 // has claimed the thread's stack as a root groop in the current | |
| 390 // collection. | |
| 391 bool claim_oops_do(bool is_par, int collection_parity) { | |
| 392 if (!is_par) { | |
| 393 _oops_do_parity = collection_parity; | |
| 394 return true; | |
| 395 } else { | |
| 396 return claim_oops_do_par_case(collection_parity); | |
| 397 } | |
| 398 } | |
| 399 | |
| 400 // Sweeper support | |
| 401 void nmethods_do(); | |
| 402 | |
| 403 // Fast-locking support | |
| 404 address highest_lock() const { return _highest_lock; } | |
| 405 void update_highest_lock(address base) { if (base > _highest_lock) _highest_lock = base; } | |
| 406 | |
| 407 // Tells if adr belong to this thread. This is used | |
| 408 // for checking if a lock is owned by the running thread. | |
| 409 // Warning: the method can only be used on the running thread | |
| 410 // Fast lock support uses these methods | |
| 411 virtual bool lock_is_in_stack(address adr) const; | |
| 412 virtual bool is_lock_owned(address adr) const; | |
| 413 | |
| 414 // Check if address is in the stack of the thread (not just for locks). | |
| 415 bool is_in_stack(address adr) const; | |
| 416 | |
| 417 // Sets this thread as starting thread. Returns failure if thread | |
| 418 // creation fails due to lack of memory, too many threads etc. | |
| 419 bool set_as_starting_thread(); | |
| 420 | |
| 421 protected: | |
| 422 // OS data associated with the thread | |
| 423 OSThread* _osthread; // Platform-specific thread information | |
| 424 | |
| 425 // Thread local resource area for temporary allocation within the VM | |
| 426 ResourceArea* _resource_area; | |
| 427 | |
| 428 // Thread local handle area for allocation of handles within the VM | |
| 429 HandleArea* _handle_area; | |
| 430 | |
| 431 // Support for stack overflow handling, get_thread, etc. | |
| 432 address _stack_base; | |
| 433 size_t _stack_size; | |
| 434 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
| 435 int _lgrp_id; | |
| 436 | |
| 437 public: | |
| 438 // Stack overflow support | |
| 439 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
| 440 | |
| 441 void set_stack_base(address base) { _stack_base = base; } | |
| 442 size_t stack_size() const { return _stack_size; } | |
| 443 void set_stack_size(size_t size) { _stack_size = size; } | |
| 444 void record_stack_base_and_size(); | |
| 445 | |
| 446 int lgrp_id() const { return _lgrp_id; } | |
| 447 void set_lgrp_id(int value) { _lgrp_id = value; } | |
| 448 | |
| 449 // Printing | |
| 450 void print_on(outputStream* st) const; | |
| 451 void print() const { print_on(tty); } | |
| 452 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 453 | |
| 454 // Debug-only code | |
| 455 | |
| 456 #ifdef ASSERT | |
| 457 private: | |
| 458 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
| 459 Monitor *_owned_locks; | |
| 460 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, | |
| 461 // thus the friendship | |
| 462 friend class Mutex; | |
| 463 friend class Monitor; | |
| 464 | |
| 465 public: | |
| 466 void print_owned_locks_on(outputStream* st) const; | |
| 467 void print_owned_locks() const { print_owned_locks_on(tty); } | |
| 468 Monitor * owned_locks() const { return _owned_locks; } | |
| 469 bool owns_locks() const { return owned_locks() != NULL; } | |
| 470 bool owns_locks_but_compiled_lock() const; | |
| 471 | |
| 472 // Deadlock detection | |
| 473 bool allow_allocation() { return _allow_allocation_count == 0; } | |
| 474 #endif | |
| 475 | |
| 476 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
| 477 | |
| 478 private: | |
| 479 volatile int _jvmti_env_iteration_count; | |
| 480 | |
| 481 public: | |
| 482 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
| 483 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
| 484 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
| 485 | |
| 486 // Code generation | |
| 487 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
| 488 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
| 489 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
| 490 | |
| 491 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
| 492 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
| 493 static ByteSize omFreeList_offset() { return byte_offset_of(Thread, omFreeList); } | |
| 494 | |
| 495 #define TLAB_FIELD_OFFSET(name) \ | |
| 496 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } | |
| 497 | |
| 498 TLAB_FIELD_OFFSET(start) | |
| 499 TLAB_FIELD_OFFSET(end) | |
| 500 TLAB_FIELD_OFFSET(top) | |
| 501 TLAB_FIELD_OFFSET(pf_top) | |
| 502 TLAB_FIELD_OFFSET(size) // desired_size | |
| 503 TLAB_FIELD_OFFSET(refill_waste_limit) | |
| 504 TLAB_FIELD_OFFSET(number_of_refills) | |
| 505 TLAB_FIELD_OFFSET(fast_refill_waste) | |
| 506 TLAB_FIELD_OFFSET(slow_allocations) | |
| 507 | |
| 508 #undef TLAB_FIELD_OFFSET | |
| 509 | |
| 510 public: | |
| 511 volatile intptr_t _Stalled ; | |
| 512 volatile int _TypeTag ; | |
| 513 ParkEvent * _ParkEvent ; // for synchronized() | |
| 514 ParkEvent * _SleepEvent ; // for Thread.sleep | |
| 515 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
| 516 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
| 517 int NativeSyncRecursion ; // diagnostic | |
| 518 | |
| 519 volatile int _OnTrap ; // Resume-at IP delta | |
| 520 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
| 521 jint _hashStateX ; // thread-specific hashCode generator state | |
| 522 jint _hashStateY ; | |
| 523 jint _hashStateZ ; | |
| 524 void * _schedctl ; | |
| 525 | |
| 526 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
| 527 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
| 528 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
| 529 | |
| 530 volatile jint rng [4] ; // RNG for spin loop | |
| 531 | |
| 532 // Low-level leaf-lock primitives used to implement synchronization | |
| 533 // and native monitor-mutex infrastructure. | |
| 534 // Not for general synchronization use. | |
| 535 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
| 536 static void SpinRelease (volatile int * Lock) ; | |
| 537 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
| 538 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
| 539 static void muxRelease (volatile intptr_t * Lock) ; | |
| 540 | |
| 541 }; | |
| 542 | |
| 543 // Inline implementation of Thread::current() | |
| 544 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
| 545 // startup. | |
| 546 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
| 547 // period. This is inlined in thread_<os_family>.inline.hpp. | |
| 548 | |
| 549 inline Thread* Thread::current() { | |
| 550 #ifdef ASSERT | |
| 551 // This function is very high traffic. Define PARANOID to enable expensive | |
| 552 // asserts. | |
| 553 #ifdef PARANOID | |
| 554 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
| 555 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
| 556 assert(t != NULL && !t->is_inside_signal_handler(), | |
| 557 "Don't use Thread::current() inside signal handler"); | |
| 558 #endif | |
| 559 #endif | |
| 560 Thread* thread = ThreadLocalStorage::thread(); | |
| 561 assert(thread != NULL, "just checking"); | |
| 562 return thread; | |
| 563 } | |
| 564 | |
| 565 // Name support for threads. non-JavaThread subclasses with multiple | |
| 566 // uniquely named instances should derive from this. | |
| 567 class NamedThread: public Thread { | |
| 568 friend class VMStructs; | |
| 569 enum { | |
| 570 max_name_len = 64 | |
| 571 }; | |
| 572 private: | |
| 573 char* _name; | |
| 574 public: | |
| 575 NamedThread(); | |
| 576 ~NamedThread(); | |
| 577 // May only be called once per thread. | |
| 578 void set_name(const char* format, ...); | |
| 579 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } | |
| 580 }; | |
| 581 | |
| 582 // Worker threads are named and have an id of an assigned work. | |
| 583 class WorkerThread: public NamedThread { | |
| 584 private: | |
| 585 uint _id; | |
| 586 public: | |
| 587 WorkerThread() : _id(0) { } | |
| 588 void set_id(uint work_id) { _id = work_id; } | |
| 589 uint id() const { return _id; } | |
| 590 }; | |
| 591 | |
| 592 // A single WatcherThread is used for simulating timer interrupts. | |
| 593 class WatcherThread: public Thread { | |
| 594 friend class VMStructs; | |
| 595 public: | |
| 596 virtual void run(); | |
| 597 | |
| 598 private: | |
| 599 static WatcherThread* _watcher_thread; | |
| 600 | |
| 601 static bool _should_terminate; | |
| 602 public: | |
| 603 enum SomeConstants { | |
| 604 delay_interval = 10 // interrupt delay in milliseconds | |
| 605 }; | |
| 606 | |
| 607 // Constructor | |
| 608 WatcherThread(); | |
| 609 | |
| 610 // Tester | |
| 611 bool is_Watcher_thread() const { return true; } | |
| 612 | |
| 613 // Printing | |
| 614 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
| 615 void print_on(outputStream* st) const; | |
| 616 void print() const { print_on(tty); } | |
| 617 | |
| 618 // Returns the single instance of WatcherThread | |
| 619 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
| 620 | |
| 621 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
| 622 static void start(); | |
| 623 static void stop(); | |
| 624 }; | |
| 625 | |
| 626 | |
| 627 class CompilerThread; | |
| 628 | |
| 629 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
| 630 | |
| 631 class JavaThread: public Thread { | |
| 632 friend class VMStructs; | |
| 633 private: | |
| 634 JavaThread* _next; // The next thread in the Threads list | |
| 635 oop _threadObj; // The Java level thread object | |
| 636 | |
| 637 #ifdef ASSERT | |
| 638 private: | |
| 639 int _java_call_counter; | |
| 640 | |
| 641 public: | |
| 642 int java_call_counter() { return _java_call_counter; } | |
| 643 void inc_java_call_counter() { _java_call_counter++; } | |
| 644 void dec_java_call_counter() { | |
| 645 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
| 646 _java_call_counter--; | |
| 647 } | |
| 648 private: // restore original namespace restriction | |
| 649 #endif // ifdef ASSERT | |
| 650 | |
| 651 #ifndef PRODUCT | |
| 652 public: | |
| 653 enum { | |
| 654 jump_ring_buffer_size = 16 | |
| 655 }; | |
| 656 private: // restore original namespace restriction | |
| 657 #endif | |
| 658 | |
| 659 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
| 660 | |
| 661 ThreadFunction _entry_point; | |
| 662 | |
| 663 JNIEnv _jni_environment; | |
| 664 | |
| 665 // Deopt support | |
| 666 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
| 667 | |
| 668 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
| 669 // transition out of native | |
| 670 | |
| 671 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays | |
| 672 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
| 673 // Because deoptimization is lazy we must save jvmti requests to set locals | |
| 674 // in compiled frames until we deoptimize and we have an interpreter frame. | |
| 675 // This holds the pointer to array (yeah like there might be more than one) of | |
| 676 // description of compiled vframes that have locals that need to be updated. | |
| 677 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
| 678 | |
| 679 // Handshake value for fixing 6243940. We need a place for the i2c | |
| 680 // adapter to store the callee methodOop. This value is NEVER live | |
| 681 // across a gc point so it does NOT have to be gc'd | |
| 682 // The handshake is open ended since we can't be certain that it will | |
| 683 // be NULLed. This is because we rarely ever see the race and end up | |
| 684 // in handle_wrong_method which is the backend of the handshake. See | |
| 685 // code in i2c adapters and handle_wrong_method. | |
| 686 | |
| 687 methodOop _callee_target; | |
| 688 | |
| 689 // Oop results of VM runtime calls | |
| 690 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved | |
| 691 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved | |
| 692 | |
| 693 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
| 694 // allocated during deoptimization | |
| 695 // and by JNI_MonitorEnter/Exit | |
| 696 | |
| 697 // Async. requests support | |
| 698 enum AsyncRequests { | |
| 699 _no_async_condition = 0, | |
| 700 _async_exception, | |
| 701 _async_unsafe_access_error | |
| 702 }; | |
| 703 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
| 704 oop _pending_async_exception; | |
| 705 | |
| 706 // Safepoint support | |
| 707 public: // Expose _thread_state for SafeFetchInt() | |
| 708 volatile JavaThreadState _thread_state; | |
| 709 private: | |
| 710 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
| 711 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
| 712 | |
| 713 // JavaThread termination support | |
| 714 enum TerminatedTypes { | |
| 715 _not_terminated = 0xDEAD - 2, | |
| 716 _thread_exiting, // JavaThread::exit() has been called for this thread | |
| 717 _thread_terminated, // JavaThread is removed from thread list | |
| 718 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
| 719 // only VM_Exit can set _vm_exited | |
| 720 }; | |
| 721 | |
| 722 // In general a JavaThread's _terminated field transitions as follows: | |
| 723 // | |
| 724 // _not_terminated => _thread_exiting => _thread_terminated | |
| 725 // | |
| 726 // _vm_exited is a special value to cover the case of a JavaThread | |
| 727 // executing native code after the VM itself is terminated. | |
| 728 TerminatedTypes _terminated; | |
| 729 // suspend/resume support | |
| 730 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
| 731 jint _in_deopt_handler; // count of deoptimization | |
| 732 // handlers thread is in | |
| 733 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
| 734 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
| 735 // never locked) when throwing an exception. Used by interpreter only. | |
| 736 | |
| 737 // Flag to mark a JNI thread in the process of attaching - See CR 6404306 | |
| 738 // This flag is never set true other than at construction, and in that case | |
| 739 // is shortly thereafter set false | |
| 740 volatile bool _is_attaching; | |
| 741 | |
| 742 public: | |
| 743 // State of the stack guard pages for this thread. | |
| 744 enum StackGuardState { | |
| 745 stack_guard_unused, // not needed | |
| 746 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
| 747 stack_guard_enabled // enabled | |
| 748 }; | |
| 749 | |
| 750 private: | |
| 751 | |
| 752 StackGuardState _stack_guard_state; | |
| 753 | |
| 754 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
| 755 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
| 756 // code) | |
| 757 volatile oop _exception_oop; // Exception thrown in compiled code | |
| 758 volatile address _exception_pc; // PC where exception happened | |
| 759 volatile address _exception_handler_pc; // PC for handler of exception | |
| 760 volatile int _exception_stack_size; // Size of frame where exception happened | |
| 761 | |
| 762 // support for compilation | |
| 763 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) | |
| 764 | |
| 765 // support for JNI critical regions | |
| 766 jint _jni_active_critical; // count of entries into JNI critical region | |
| 767 | |
| 768 // For deadlock detection. | |
| 769 int _depth_first_number; | |
| 770 | |
| 771 // JVMTI PopFrame support | |
| 772 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
| 773 int _popframe_condition; | |
| 774 | |
| 775 #ifndef PRODUCT | |
| 776 int _jmp_ring_index; | |
| 777 struct { | |
| 778 // We use intptr_t instead of address so debugger doesn't try and display strings | |
| 779 intptr_t _target; | |
| 780 intptr_t _instruction; | |
| 781 const char* _file; | |
| 782 int _line; | |
| 783 } _jmp_ring[ jump_ring_buffer_size ]; | |
| 784 #endif /* PRODUCT */ | |
| 785 | |
| 342 | 786 #ifndef SERIALGC |
| 787 // Support for G1 barriers | |
| 788 | |
| 789 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
| 790 // Set of all such queues. | |
| 791 static SATBMarkQueueSet _satb_mark_queue_set; | |
| 792 | |
| 793 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
| 794 // Set of all such queues. | |
| 795 static DirtyCardQueueSet _dirty_card_queue_set; | |
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797 void flush_barrier_queues(); |
| 342 | 798 #endif // !SERIALGC |
| 799 | |
| 0 | 800 friend class VMThread; |
| 801 friend class ThreadWaitTransition; | |
| 802 friend class VM_Exit; | |
| 803 | |
| 804 void initialize(); // Initialized the instance variables | |
| 805 | |
| 806 public: | |
| 807 // Constructor | |
| 808 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads | |
| 809 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); | |
| 810 ~JavaThread(); | |
| 811 | |
| 812 #ifdef ASSERT | |
| 813 // verify this JavaThread hasn't be published in the Threads::list yet | |
| 814 void verify_not_published(); | |
| 815 #endif | |
| 816 | |
| 817 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
| 818 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
| 819 _jni_environment.functions = functionTable; | |
| 820 } | |
| 821 struct JNINativeInterface_* get_jni_functions() { | |
| 822 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
| 823 } | |
| 824 | |
| 825 // Executes Shutdown.shutdown() | |
| 826 void invoke_shutdown_hooks(); | |
| 827 | |
| 828 // Cleanup on thread exit | |
| 829 enum ExitType { | |
| 830 normal_exit, | |
| 831 jni_detach | |
| 832 }; | |
| 833 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
| 834 | |
| 835 void cleanup_failed_attach_current_thread(); | |
| 836 | |
| 837 // Testers | |
| 838 virtual bool is_Java_thread() const { return true; } | |
| 839 | |
| 840 // compilation | |
| 841 void set_is_compiling(bool f) { _is_compiling = f; } | |
| 842 bool is_compiling() const { return _is_compiling; } | |
| 843 | |
| 844 // Thread chain operations | |
| 845 JavaThread* next() const { return _next; } | |
| 846 void set_next(JavaThread* p) { _next = p; } | |
| 847 | |
| 848 // Thread oop. threadObj() can be NULL for initial JavaThread | |
| 849 // (or for threads attached via JNI) | |
| 850 oop threadObj() const { return _threadObj; } | |
| 851 void set_threadObj(oop p) { _threadObj = p; } | |
| 852 | |
| 853 ThreadPriority java_priority() const; // Read from threadObj() | |
| 854 | |
| 855 // Prepare thread and add to priority queue. If a priority is | |
| 856 // not specified, use the priority of the thread object. Threads_lock | |
| 857 // must be held while this function is called. | |
| 858 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
| 859 | |
| 860 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
| 861 address saved_exception_pc() { return _saved_exception_pc; } | |
| 862 | |
| 863 | |
| 864 ThreadFunction entry_point() const { return _entry_point; } | |
| 865 | |
| 866 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
| 867 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
| 868 | |
| 869 // Last frame anchor routines | |
| 870 | |
| 871 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
| 872 | |
| 873 // last_Java_sp | |
| 874 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
| 875 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
| 876 | |
| 877 // last_Java_pc | |
| 878 | |
| 879 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
| 880 | |
| 881 // Safepoint support | |
| 882 JavaThreadState thread_state() const { return _thread_state; } | |
| 883 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
| 884 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
| 885 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
| 886 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
| 887 | |
| 888 // thread has called JavaThread::exit() or is terminated | |
| 889 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
| 890 // thread is terminated (no longer on the threads list); we compare | |
| 891 // against the two non-terminated values so that a freed JavaThread | |
| 892 // will also be considered terminated. | |
| 893 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
| 894 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
| 895 // special for Threads::remove() which is static: | |
| 896 void set_terminated_value() { _terminated = _thread_terminated; } | |
| 897 void block_if_vm_exited(); | |
| 898 | |
| 899 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
| 900 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
| 901 | |
| 902 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
| 903 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
| 904 | |
| 905 | |
| 906 // Suspend/resume support for JavaThread | |
| 907 | |
| 908 private: | |
| 909 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
| 910 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
| 911 | |
| 912 public: | |
| 913 void java_suspend(); | |
| 914 void java_resume(); | |
| 915 int java_suspend_self(); | |
| 916 | |
| 917 void check_and_wait_while_suspended() { | |
| 918 assert(JavaThread::current() == this, "sanity check"); | |
| 919 | |
| 920 bool do_self_suspend; | |
| 921 do { | |
| 922 // were we externally suspended while we were waiting? | |
| 923 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
| 924 if (do_self_suspend) { | |
| 925 // don't surprise the thread that suspended us by returning | |
| 926 java_suspend_self(); | |
| 927 set_suspend_equivalent(); | |
| 928 } | |
| 929 } while (do_self_suspend); | |
| 930 } | |
| 931 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
| 932 // Check for async exception in addition to safepoint and suspend request. | |
| 933 static void check_special_condition_for_native_trans(JavaThread *thread); | |
| 934 | |
| 935 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
| 936 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
| 937 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 938 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 939 // SR_lock to allow the thread to reach a stable thread state if | |
| 940 // it is currently in a transient thread state. | |
| 941 return is_ext_suspend_completed(false /*!called_by_wait */, | |
| 942 SuspendRetryDelay, bits); | |
| 943 } | |
| 944 | |
| 945 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
| 946 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
| 947 // passed as the count and delay parameters. Experiments with specific | |
| 948 // calls to wait_for_ext_suspend_completion() can be done by passing | |
| 949 // other values in the code. Experiments with all calls can be done | |
| 950 // via the appropriate -XX options. | |
| 951 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
| 952 | |
| 953 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
| 954 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
| 955 | |
| 956 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
| 957 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
| 958 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
| 959 | |
| 960 bool is_external_suspend() const { | |
| 961 return (_suspend_flags & _external_suspend) != 0; | |
| 962 } | |
| 963 // Whenever a thread transitions from native to vm/java it must suspend | |
| 964 // if external|deopt suspend is present. | |
| 965 bool is_suspend_after_native() const { | |
| 966 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
| 967 } | |
| 968 | |
| 969 // external suspend request is completed | |
| 970 bool is_ext_suspended() const { | |
| 971 return (_suspend_flags & _ext_suspended) != 0; | |
| 972 } | |
| 973 | |
| 974 // legacy method that checked for either external suspension or vm suspension | |
| 975 bool is_any_suspended() const { | |
| 976 return is_ext_suspended(); | |
| 977 } | |
| 978 | |
| 979 bool is_external_suspend_with_lock() const { | |
| 980 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 981 return is_external_suspend(); | |
| 982 } | |
| 983 | |
| 984 // Special method to handle a pending external suspend request | |
| 985 // when a suspend equivalent condition lifts. | |
| 986 bool handle_special_suspend_equivalent_condition() { | |
| 987 assert(is_suspend_equivalent(), | |
| 988 "should only be called in a suspend equivalence condition"); | |
| 989 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 990 bool ret = is_external_suspend(); | |
| 991 if (!ret) { | |
| 992 // not about to self-suspend so clear suspend equivalence | |
| 993 clear_suspend_equivalent(); | |
| 994 } | |
| 995 // implied else: | |
| 996 // We have a pending external suspend request so we leave the | |
| 997 // suspend_equivalent flag set until java_suspend_self() sets | |
| 998 // the ext_suspended flag and clears the suspend_equivalent | |
| 999 // flag. This insures that wait_for_ext_suspend_completion() | |
| 1000 // will return consistent values. | |
| 1001 return ret; | |
| 1002 } | |
| 1003 | |
| 1004 bool is_any_suspended_with_lock() const { | |
| 1005 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1006 return is_any_suspended(); | |
| 1007 } | |
| 1008 // utility methods to see if we are doing some kind of suspension | |
| 1009 bool is_being_ext_suspended() const { | |
| 1010 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1011 return is_ext_suspended() || is_external_suspend(); | |
| 1012 } | |
| 1013 | |
| 1014 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
| 1015 | |
| 1016 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
| 1017 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
| 1018 | |
| 1019 // Thread.stop support | |
| 1020 void send_thread_stop(oop throwable); | |
| 1021 AsyncRequests clear_special_runtime_exit_condition() { | |
| 1022 AsyncRequests x = _special_runtime_exit_condition; | |
| 1023 _special_runtime_exit_condition = _no_async_condition; | |
| 1024 return x; | |
| 1025 } | |
| 1026 | |
| 1027 // Are any async conditions present? | |
| 1028 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
| 1029 | |
| 1030 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
| 1031 | |
| 1032 // these next two are also used for self-suspension and async exception support | |
| 1033 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
| 1034 | |
| 1035 // Return true if JavaThread has an asynchronous condition or | |
| 1036 // if external suspension is requested. | |
| 1037 bool has_special_runtime_exit_condition() { | |
| 1038 // We call is_external_suspend() last since external suspend should | |
| 1039 // be less common. Because we don't use is_external_suspend_with_lock | |
| 1040 // it is possible that we won't see an asynchronous external suspend | |
| 1041 // request that has just gotten started, i.e., SR_lock grabbed but | |
| 1042 // _external_suspend field change either not made yet or not visible | |
| 1043 // yet. However, this is okay because the request is asynchronous and | |
| 1044 // we will see the new flag value the next time through. It's also | |
| 1045 // possible that the external suspend request is dropped after | |
| 1046 // we have checked is_external_suspend(), we will recheck its value | |
| 1047 // under SR_lock in java_suspend_self(). | |
| 1048 return (_special_runtime_exit_condition != _no_async_condition) || | |
| 1049 is_external_suspend() || is_deopt_suspend(); | |
| 1050 } | |
| 1051 | |
| 1052 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
| 1053 | |
| 1054 void set_pending_async_exception(oop e) { | |
| 1055 _pending_async_exception = e; | |
| 1056 _special_runtime_exit_condition = _async_exception; | |
| 1057 set_has_async_exception(); | |
| 1058 } | |
| 1059 | |
| 1060 // Fast-locking support | |
| 1061 bool is_lock_owned(address adr) const; | |
| 1062 | |
| 1063 // Accessors for vframe array top | |
| 1064 // The linked list of vframe arrays are sorted on sp. This means when we | |
| 1065 // unpack the head must contain the vframe array to unpack. | |
| 1066 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
| 1067 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
| 1068 | |
| 1069 // Side structure for defering update of java frame locals until deopt occurs | |
| 1070 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
| 1071 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
| 1072 | |
| 1073 // These only really exist to make debugging deopt problems simpler | |
| 1074 | |
| 1075 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
| 1076 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
| 1077 | |
| 1078 // The special resourceMark used during deoptimization | |
| 1079 | |
| 1080 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
| 1081 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
| 1082 | |
| 1083 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
| 1084 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
| 1085 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
| 1086 | |
| 1087 methodOop callee_target() const { return _callee_target; } | |
| 1088 void set_callee_target (methodOop x) { _callee_target = x; } | |
| 1089 | |
| 1090 // Oop results of vm runtime calls | |
| 1091 oop vm_result() const { return _vm_result; } | |
| 1092 void set_vm_result (oop x) { _vm_result = x; } | |
| 1093 | |
| 1094 oop vm_result_2() const { return _vm_result_2; } | |
| 1095 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
| 1096 | |
| 1097 // Exception handling for compiled methods | |
| 1098 oop exception_oop() const { return _exception_oop; } | |
| 1099 int exception_stack_size() const { return _exception_stack_size; } | |
| 1100 address exception_pc() const { return _exception_pc; } | |
| 1101 address exception_handler_pc() const { return _exception_handler_pc; } | |
| 1102 | |
| 1103 void set_exception_oop(oop o) { _exception_oop = o; } | |
| 1104 void set_exception_pc(address a) { _exception_pc = a; } | |
| 1105 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
| 1106 void set_exception_stack_size(int size) { _exception_stack_size = size; } | |
| 1107 | |
| 1108 // Stack overflow support | |
| 1109 inline size_t stack_available(address cur_sp); | |
| 1110 address stack_yellow_zone_base() | |
| 1111 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
| 1112 size_t stack_yellow_zone_size() | |
| 1113 { return StackYellowPages * os::vm_page_size(); } | |
| 1114 address stack_red_zone_base() | |
| 1115 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
| 1116 size_t stack_red_zone_size() | |
| 1117 { return StackRedPages * os::vm_page_size(); } | |
| 1118 bool in_stack_yellow_zone(address a) | |
| 1119 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
| 1120 bool in_stack_red_zone(address a) | |
| 1121 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
| 1122 | |
| 1123 void create_stack_guard_pages(); | |
| 1124 void remove_stack_guard_pages(); | |
| 1125 | |
| 1126 void enable_stack_yellow_zone(); | |
| 1127 void disable_stack_yellow_zone(); | |
| 1128 void enable_stack_red_zone(); | |
| 1129 void disable_stack_red_zone(); | |
| 1130 | |
| 1131 inline bool stack_yellow_zone_disabled(); | |
| 1132 inline bool stack_yellow_zone_enabled(); | |
| 1133 | |
| 1134 // Attempt to reguard the stack after a stack overflow may have occurred. | |
| 1135 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
| 1136 // pages are already guarded, or (c) the pages were successfully reguarded. | |
| 1137 // Returns false if there is not enough stack space to reguard the pages, in | |
| 1138 // which case the caller should unwind a frame and try again. The argument | |
| 1139 // should be the caller's (approximate) sp. | |
| 1140 bool reguard_stack(address cur_sp); | |
| 1141 // Similar to above but see if current stackpoint is out of the guard area | |
| 1142 // and reguard if possible. | |
| 1143 bool reguard_stack(void); | |
| 1144 | |
| 1145 // Misc. accessors/mutators | |
| 1146 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
| 1147 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
| 1148 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
| 1149 | |
| 1150 #ifndef PRODUCT | |
| 1151 void record_jump(address target, address instr, const char* file, int line); | |
| 1152 #endif /* PRODUCT */ | |
| 1153 | |
| 1154 // For assembly stub generation | |
| 1155 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
| 1156 #ifndef PRODUCT | |
| 1157 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
| 1158 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
| 1159 #endif /* PRODUCT */ | |
| 1160 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
| 1161 static ByteSize last_Java_sp_offset() { | |
| 1162 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
| 1163 } | |
| 1164 static ByteSize last_Java_pc_offset() { | |
| 1165 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
| 1166 } | |
| 1167 static ByteSize frame_anchor_offset() { | |
| 1168 return byte_offset_of(JavaThread, _anchor); | |
| 1169 } | |
| 1170 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
| 1171 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
| 1172 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
| 1173 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
| 1174 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
| 1175 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
| 1176 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
| 1177 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
| 1178 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
| 1179 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); } | |
| 1180 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } | |
| 1181 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
| 1182 | |
| 1183 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
| 1184 | |
| 342 | 1185 #ifndef SERIALGC |
| 1186 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
| 1187 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
| 1188 #endif // !SERIALGC | |
| 1189 | |
| 0 | 1190 // Returns the jni environment for this thread |
| 1191 JNIEnv* jni_environment() { return &_jni_environment; } | |
| 1192 | |
| 1193 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
| 1194 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
| 1195 // Only return NULL if thread is off the thread list; starting to | |
| 1196 // exit should not return NULL. | |
| 1197 if (thread_from_jni_env->is_terminated()) { | |
| 1198 thread_from_jni_env->block_if_vm_exited(); | |
| 1199 return NULL; | |
| 1200 } else { | |
| 1201 return thread_from_jni_env; | |
| 1202 } | |
| 1203 } | |
| 1204 | |
| 1205 // JNI critical regions. These can nest. | |
| 1206 bool in_critical() { return _jni_active_critical > 0; } | |
| 1207 void enter_critical() { assert(Thread::current() == this, | |
| 1208 "this must be current thread"); | |
| 1209 _jni_active_critical++; } | |
| 1210 void exit_critical() { assert(Thread::current() == this, | |
| 1211 "this must be current thread"); | |
| 1212 _jni_active_critical--; | |
| 1213 assert(_jni_active_critical >= 0, | |
| 1214 "JNI critical nesting problem?"); } | |
| 1215 | |
| 1216 // For deadlock detection | |
| 1217 int depth_first_number() { return _depth_first_number; } | |
| 1218 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
| 1219 | |
| 1220 private: | |
| 1221 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
| 1222 | |
| 1223 public: | |
| 1224 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
| 1225 void add_monitor_chunk(MonitorChunk* chunk); | |
| 1226 void remove_monitor_chunk(MonitorChunk* chunk); | |
| 1227 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
| 1228 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
| 1229 void dec_in_deopt_handler() { | |
| 1230 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
| 1231 if (_in_deopt_handler > 0) { // robustness | |
| 1232 _in_deopt_handler--; | |
| 1233 } | |
| 1234 } | |
| 1235 | |
| 1236 private: | |
| 1237 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
| 1238 | |
| 1239 public: | |
| 1240 | |
| 1241 // Frame iteration; calls the function f for all frames on the stack | |
| 1242 void frames_do(void f(frame*, const RegisterMap*)); | |
| 1243 | |
| 1244 // Memory operations | |
| 1245 void oops_do(OopClosure* f); | |
| 1246 | |
| 1247 // Sweeper operations | |
| 1248 void nmethods_do(); | |
| 1249 | |
| 1250 // Memory management operations | |
| 1251 void gc_epilogue(); | |
| 1252 void gc_prologue(); | |
| 1253 | |
| 1254 // Misc. operations | |
| 1255 char* name() const { return (char*)get_thread_name(); } | |
| 1256 void print_on(outputStream* st) const; | |
| 1257 void print() const { print_on(tty); } | |
| 1258 void print_value(); | |
| 1259 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
| 1260 void print_thread_state() const PRODUCT_RETURN; | |
| 1261 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 1262 void verify(); | |
| 1263 const char* get_thread_name() const; | |
| 1264 private: | |
| 1265 // factor out low-level mechanics for use in both normal and error cases | |
| 1266 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
| 1267 public: | |
| 1268 const char* get_threadgroup_name() const; | |
| 1269 const char* get_parent_name() const; | |
| 1270 | |
| 1271 // Accessing frames | |
| 1272 frame last_frame() { | |
| 1273 _anchor.make_walkable(this); | |
| 1274 return pd_last_frame(); | |
| 1275 } | |
| 1276 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
| 1277 | |
| 1278 // Returns method at 'depth' java or native frames down the stack | |
| 1279 // Used for security checks | |
| 1280 klassOop security_get_caller_class(int depth); | |
| 1281 | |
| 1282 // Print stack trace in external format | |
| 1283 void print_stack_on(outputStream* st); | |
| 1284 void print_stack() { print_stack_on(tty); } | |
| 1285 | |
| 1286 // Print stack traces in various internal formats | |
| 1287 void trace_stack() PRODUCT_RETURN; | |
| 1288 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
| 1289 void trace_frames() PRODUCT_RETURN; | |
| 1290 | |
| 1291 // Returns the number of stack frames on the stack | |
| 1292 int depth() const; | |
| 1293 | |
| 1294 // Function for testing deoptimization | |
| 1295 void deoptimize(); | |
| 1296 void make_zombies(); | |
| 1297 | |
| 1298 void deoptimized_wrt_marked_nmethods(); | |
| 1299 | |
| 1300 // Profiling operation (see fprofile.cpp) | |
| 1301 public: | |
| 1302 bool profile_last_Java_frame(frame* fr); | |
| 1303 | |
| 1304 private: | |
| 1305 ThreadProfiler* _thread_profiler; | |
| 1306 private: | |
| 1307 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
| 1308 friend class FlatProfilerTask; // uses get_thread_profiler. | |
| 1309 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
| 1310 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
| 1311 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
| 1312 ThreadProfiler* result = _thread_profiler; | |
| 1313 _thread_profiler = tp; | |
| 1314 return result; | |
| 1315 } | |
| 1316 | |
| 1317 // Static operations | |
| 1318 public: | |
| 1319 // Returns the running thread as a JavaThread | |
| 1320 static inline JavaThread* current(); | |
| 1321 | |
| 1322 // Returns the active Java thread. Do not use this if you know you are calling | |
| 1323 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
| 1324 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
| 1325 // operation. You may not want that either. | |
| 1326 static JavaThread* active(); | |
| 1327 | |
| 1328 inline CompilerThread* as_CompilerThread(); | |
| 1329 | |
| 1330 public: | |
| 1331 virtual void run(); | |
| 1332 void thread_main_inner(); | |
| 1333 | |
| 1334 private: | |
| 1335 // PRIVILEGED STACK | |
| 1336 PrivilegedElement* _privileged_stack_top; | |
| 1337 GrowableArray<oop>* _array_for_gc; | |
| 1338 public: | |
| 1339 | |
| 1340 // Returns the privileged_stack information. | |
| 1341 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
| 1342 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
| 1343 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
| 1344 | |
| 1345 public: | |
| 1346 // Thread local information maintained by JVMTI. | |
| 1347 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
|
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1348 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1349 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1350 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1351 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1352 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1353 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1354 // the specified JavaThread is exiting. |
| 0 | 1355 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
| 1356 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
| 1357 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
| 1358 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
| 1359 | |
| 1360 // JVMTI PopFrame support | |
| 1361 // Setting and clearing popframe_condition | |
| 1362 // All of these enumerated values are bits. popframe_pending | |
| 1363 // indicates that a PopFrame() has been requested and not yet been | |
| 1364 // completed. popframe_processing indicates that that PopFrame() is in | |
| 1365 // the process of being completed. popframe_force_deopt_reexecution_bit | |
| 1366 // indicates that special handling is required when returning to a | |
| 1367 // deoptimized caller. | |
| 1368 enum PopCondition { | |
| 1369 popframe_inactive = 0x00, | |
| 1370 popframe_pending_bit = 0x01, | |
| 1371 popframe_processing_bit = 0x02, | |
| 1372 popframe_force_deopt_reexecution_bit = 0x04 | |
| 1373 }; | |
| 1374 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
| 1375 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
| 1376 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
| 1377 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
| 1378 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
| 1379 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
| 1380 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
| 1381 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
| 1382 #ifdef CC_INTERP | |
| 1383 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
| 1384 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
| 1385 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
| 1386 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
| 1387 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
| 1388 #endif | |
| 1389 | |
| 1390 private: | |
| 1391 // Saved incoming arguments to popped frame. | |
| 1392 // Used only when popped interpreted frame returns to deoptimized frame. | |
| 1393 void* _popframe_preserved_args; | |
| 1394 int _popframe_preserved_args_size; | |
| 1395 | |
| 1396 public: | |
| 1397 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
| 1398 void* popframe_preserved_args(); | |
| 1399 ByteSize popframe_preserved_args_size(); | |
| 1400 WordSize popframe_preserved_args_size_in_words(); | |
| 1401 void popframe_free_preserved_args(); | |
| 1402 | |
| 1403 | |
| 1404 private: | |
| 1405 JvmtiThreadState *_jvmti_thread_state; | |
| 1406 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
| 1407 | |
| 1408 // Used by the interpreter in fullspeed mode for frame pop, method | |
| 1409 // entry, method exit and single stepping support. This field is | |
| 1410 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
| 1411 // It can be set to zero asynchronously (i.e., without a VM operation | |
| 1412 // or a lock) so we have to be very careful. | |
| 1413 int _interp_only_mode; | |
| 1414 | |
| 1415 public: | |
| 1416 // used by the interpreter for fullspeed debugging support (see above) | |
| 1417 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
| 1418 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
| 1419 int get_interp_only_mode() { return _interp_only_mode; } | |
| 1420 void increment_interp_only_mode() { ++_interp_only_mode; } | |
| 1421 void decrement_interp_only_mode() { --_interp_only_mode; } | |
| 1422 | |
| 1423 private: | |
| 1424 ThreadStatistics *_thread_stat; | |
| 1425 | |
| 1426 public: | |
| 1427 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
| 1428 | |
| 1429 // Return a blocker object for which this thread is blocked parking. | |
| 1430 oop current_park_blocker(); | |
| 1431 | |
| 1432 private: | |
| 1433 static size_t _stack_size_at_create; | |
| 1434 | |
| 1435 public: | |
| 1436 static inline size_t stack_size_at_create(void) { | |
| 1437 return _stack_size_at_create; | |
| 1438 } | |
| 1439 static inline void set_stack_size_at_create(size_t value) { | |
| 1440 _stack_size_at_create = value; | |
| 1441 } | |
| 1442 | |
| 342 | 1443 #ifndef SERIALGC |
| 1444 // SATB marking queue support | |
| 1445 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
| 1446 static SATBMarkQueueSet& satb_mark_queue_set() { | |
| 1447 return _satb_mark_queue_set; | |
| 1448 } | |
| 1449 | |
| 1450 // Dirty card queue support | |
| 1451 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
| 1452 static DirtyCardQueueSet& dirty_card_queue_set() { | |
| 1453 return _dirty_card_queue_set; | |
| 1454 } | |
| 1455 #endif // !SERIALGC | |
| 1456 | |
| 0 | 1457 // Machine dependent stuff |
| 1458 #include "incls/_thread_pd.hpp.incl" | |
| 1459 | |
| 1460 public: | |
| 1461 void set_blocked_on_compilation(bool value) { | |
| 1462 _blocked_on_compilation = value; | |
| 1463 } | |
| 1464 | |
| 1465 bool blocked_on_compilation() { | |
| 1466 return _blocked_on_compilation; | |
| 1467 } | |
| 1468 protected: | |
| 1469 bool _blocked_on_compilation; | |
| 1470 | |
| 1471 | |
| 1472 // JSR166 per-thread parker | |
| 1473 private: | |
| 1474 Parker* _parker; | |
| 1475 public: | |
| 1476 Parker* parker() { return _parker; } | |
| 1477 | |
| 1478 // Biased locking support | |
| 1479 private: | |
| 1480 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
| 1481 public: | |
| 1482 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
| 1483 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
| 1484 | |
| 1485 // clearing/querying jni attach status | |
| 1486 bool is_attaching() const { return _is_attaching; } | |
| 1487 void set_attached() { _is_attaching = false; OrderAccess::fence(); } | |
| 342 | 1488 private: |
| 1489 // This field is used to determine if a thread has claimed | |
| 1490 // a par_id: it is -1 if the thread has not claimed a par_id; | |
| 1491 // otherwise its value is the par_id that has been claimed. | |
| 1492 int _claimed_par_id; | |
| 1493 public: | |
| 1494 int get_claimed_par_id() { return _claimed_par_id; } | |
| 1495 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
| 0 | 1496 }; |
| 1497 | |
| 1498 // Inline implementation of JavaThread::current | |
| 1499 inline JavaThread* JavaThread::current() { | |
| 1500 Thread* thread = ThreadLocalStorage::thread(); | |
| 1501 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
| 1502 return (JavaThread*)thread; | |
| 1503 } | |
| 1504 | |
| 1505 inline CompilerThread* JavaThread::as_CompilerThread() { | |
| 1506 assert(is_Compiler_thread(), "just checking"); | |
| 1507 return (CompilerThread*)this; | |
| 1508 } | |
| 1509 | |
| 1510 inline bool JavaThread::stack_yellow_zone_disabled() { | |
| 1511 return _stack_guard_state == stack_guard_yellow_disabled; | |
| 1512 } | |
| 1513 | |
| 1514 inline bool JavaThread::stack_yellow_zone_enabled() { | |
| 1515 #ifdef ASSERT | |
| 1516 if (os::uses_stack_guard_pages()) { | |
| 1517 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
| 1518 } | |
| 1519 #endif | |
| 1520 return _stack_guard_state == stack_guard_enabled; | |
| 1521 } | |
| 1522 | |
| 1523 inline size_t JavaThread::stack_available(address cur_sp) { | |
| 1524 // This code assumes java stacks grow down | |
| 1525 address low_addr; // Limit on the address for deepest stack depth | |
| 1526 if ( _stack_guard_state == stack_guard_unused) { | |
| 1527 low_addr = stack_base() - stack_size(); | |
| 1528 } else { | |
| 1529 low_addr = stack_yellow_zone_base(); | |
| 1530 } | |
| 1531 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
| 1532 } | |
| 1533 | |
| 1534 // A JavaThread for low memory detection support | |
| 1535 class LowMemoryDetectorThread : public JavaThread { | |
| 1536 friend class VMStructs; | |
| 1537 public: | |
| 1538 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; | |
| 1539 | |
| 1540 // Hide this thread from external view. | |
| 1541 bool is_hidden_from_external_view() const { return true; } | |
| 1542 }; | |
| 1543 | |
| 1544 // A thread used for Compilation. | |
| 1545 class CompilerThread : public JavaThread { | |
| 1546 friend class VMStructs; | |
| 1547 private: | |
| 1548 CompilerCounters* _counters; | |
| 1549 | |
| 1550 ciEnv* _env; | |
| 1551 CompileLog* _log; | |
| 1552 CompileTask* _task; | |
| 1553 CompileQueue* _queue; | |
| 1554 | |
| 1555 public: | |
| 1556 | |
| 1557 static CompilerThread* current(); | |
| 1558 | |
| 1559 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
| 1560 | |
| 1561 bool is_Compiler_thread() const { return true; } | |
| 1562 // Hide this compiler thread from external view. | |
| 1563 bool is_hidden_from_external_view() const { return true; } | |
| 1564 | |
| 1565 CompileQueue* queue() { return _queue; } | |
| 1566 CompilerCounters* counters() { return _counters; } | |
| 1567 | |
| 1568 // Get/set the thread's compilation environment. | |
| 1569 ciEnv* env() { return _env; } | |
| 1570 void set_env(ciEnv* env) { _env = env; } | |
| 1571 | |
| 1572 // Get/set the thread's logging information | |
| 1573 CompileLog* log() { return _log; } | |
| 1574 void init_log(CompileLog* log) { | |
| 1575 // Set once, for good. | |
| 1576 assert(_log == NULL, "set only once"); | |
| 1577 _log = log; | |
| 1578 } | |
| 1579 | |
| 1580 #ifndef PRODUCT | |
| 1581 private: | |
| 1582 IdealGraphPrinter *_ideal_graph_printer; | |
| 1583 public: | |
| 1584 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
| 1585 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
| 1586 #endif | |
| 1587 | |
| 1588 // Get/set the thread's current task | |
| 1589 CompileTask* task() { return _task; } | |
| 1590 void set_task(CompileTask* task) { _task = task; } | |
| 1591 }; | |
| 1592 | |
| 1593 inline CompilerThread* CompilerThread::current() { | |
| 1594 return JavaThread::current()->as_CompilerThread(); | |
| 1595 } | |
| 1596 | |
| 1597 | |
| 1598 // The active thread queue. It also keeps track of the current used | |
| 1599 // thread priorities. | |
| 1600 class Threads: AllStatic { | |
| 1601 friend class VMStructs; | |
| 1602 private: | |
| 1603 static JavaThread* _thread_list; | |
| 1604 static int _number_of_threads; | |
| 1605 static int _number_of_non_daemon_threads; | |
| 1606 static int _return_code; | |
| 1607 | |
| 1608 public: | |
| 1609 // Thread management | |
| 1610 // force_daemon is a concession to JNI, where we may need to add a | |
| 1611 // thread to the thread list before allocating its thread object | |
| 1612 static void add(JavaThread* p, bool force_daemon = false); | |
| 1613 static void remove(JavaThread* p); | |
| 1614 static bool includes(JavaThread* p); | |
| 1615 static JavaThread* first() { return _thread_list; } | |
| 1616 static void threads_do(ThreadClosure* tc); | |
| 1617 | |
| 1618 // Initializes the vm and creates the vm thread | |
| 1619 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
| 1620 static void convert_vm_init_libraries_to_agents(); | |
| 1621 static void create_vm_init_libraries(); | |
| 1622 static void create_vm_init_agents(); | |
| 1623 static void shutdown_vm_agents(); | |
| 1624 static bool destroy_vm(); | |
| 1625 // Supported VM versions via JNI | |
| 1626 // Includes JNI_VERSION_1_1 | |
| 1627 static jboolean is_supported_jni_version_including_1_1(jint version); | |
| 1628 // Does not include JNI_VERSION_1_1 | |
| 1629 static jboolean is_supported_jni_version(jint version); | |
| 1630 | |
| 1631 // Garbage collection | |
| 1632 static void follow_other_roots(void f(oop*)); | |
| 1633 | |
| 1634 // Apply "f->do_oop" to all root oops in all threads. | |
| 1635 // This version may only be called by sequential code. | |
| 1636 static void oops_do(OopClosure* f); | |
| 1637 // This version may be called by sequential or parallel code. | |
| 1638 static void possibly_parallel_oops_do(OopClosure* f); | |
| 1639 // This creates a list of GCTasks, one per thread. | |
| 1640 static void create_thread_roots_tasks(GCTaskQueue* q); | |
| 1641 // This creates a list of GCTasks, one per thread, for marking objects. | |
| 1642 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
| 1643 | |
| 1644 // Apply "f->do_oop" to roots in all threads that | |
| 1645 // are part of compiled frames | |
| 1646 static void compiled_frame_oops_do(OopClosure* f); | |
| 1647 | |
| 1648 static void convert_hcode_pointers(); | |
| 1649 static void restore_hcode_pointers(); | |
| 1650 | |
| 1651 // Sweeper | |
| 1652 static void nmethods_do(); | |
| 1653 | |
| 1654 static void gc_epilogue(); | |
| 1655 static void gc_prologue(); | |
| 1656 | |
| 1657 // Verification | |
| 1658 static void verify(); | |
| 1659 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
| 1660 static void print(bool print_stacks, bool internal_format) { | |
| 1661 // this function is only used by debug.cpp | |
| 1662 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
| 1663 } | |
| 1664 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
| 1665 | |
| 1666 // Get Java threads that are waiting to enter a monitor. If doLock | |
| 1667 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1668 // VM needs to be at a safepoint. | |
| 1669 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
| 1670 address monitor, bool doLock); | |
| 1671 | |
| 1672 // Get owning Java thread from the monitor's owner field. If doLock | |
| 1673 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1674 // VM needs to be at a safepoint. | |
| 1675 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
| 1676 bool doLock); | |
| 1677 | |
| 1678 // Number of threads on the active threads list | |
| 1679 static int number_of_threads() { return _number_of_threads; } | |
| 1680 // Number of non-daemon threads on the active threads list | |
| 1681 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
| 1682 | |
| 1683 // Deoptimizes all frames tied to marked nmethods | |
| 1684 static void deoptimized_wrt_marked_nmethods(); | |
| 1685 | |
| 1686 }; | |
| 1687 | |
| 1688 | |
| 1689 // Thread iterator | |
| 1690 class ThreadClosure: public StackObj { | |
| 1691 public: | |
| 1692 virtual void do_thread(Thread* thread) = 0; | |
| 1693 }; | |
| 1694 | |
| 1695 class SignalHandlerMark: public StackObj { | |
| 1696 private: | |
| 1697 Thread* _thread; | |
| 1698 public: | |
| 1699 SignalHandlerMark(Thread* t) { | |
| 1700 _thread = t; | |
| 1701 if (_thread) _thread->enter_signal_handler(); | |
| 1702 } | |
| 1703 ~SignalHandlerMark() { | |
| 1704 if (_thread) _thread->leave_signal_handler(); | |
| 1705 _thread = NULL; | |
| 1706 } | |
| 1707 }; | |
| 1708 | |
| 1709 // ParkEvents are type-stable and immortal. | |
| 1710 // | |
| 1711 // Lifecycle: Once a ParkEvent is associated with a thread that ParkEvent remains | |
| 1712 // associated with the thread for the thread's entire lifetime - the relationship is | |
| 1713 // stable. A thread will be associated at most one ParkEvent. When the thread | |
| 1714 // expires, the ParkEvent moves to the EventFreeList. New threads attempt to allocate from | |
| 1715 // the EventFreeList before creating a new Event. Type-stability frees us from | |
| 1716 // worrying about stale Event or Thread references in the objectMonitor subsystem. | |
| 1717 // (A reference to ParkEvent is always valid, even though the event may no longer be associated | |
| 1718 // with the desired or expected thread. A key aspect of this design is that the callers of | |
| 1719 // park, unpark, etc must tolerate stale references and spurious wakeups). | |
| 1720 // | |
| 1721 // Only the "associated" thread can block (park) on the ParkEvent, although | |
| 1722 // any other thread can unpark a reachable parkevent. Park() is allowed to | |
| 1723 // return spuriously. In fact park-unpark a really just an optimization to | |
| 1724 // avoid unbounded spinning and surrender the CPU to be a polite system citizen. | |
| 1725 // A degenerate albeit "impolite" park-unpark implementation could simply return. | |
| 1726 // See http://blogs.sun.com/dave for more details. | |
| 1727 // | |
| 1728 // Eventually I'd like to eliminate Events and ObjectWaiters, both of which serve as | |
| 1729 // thread proxies, and simply make the THREAD structure type-stable and persistent. | |
| 1730 // Currently, we unpark events associated with threads, but ideally we'd just | |
| 1731 // unpark threads. | |
| 1732 // | |
| 1733 // The base-class, PlatformEvent, is platform-specific while the ParkEvent is | |
| 1734 // platform-independent. PlatformEvent provides park(), unpark(), etc., and | |
| 1735 // is abstract -- that is, a PlatformEvent should never be instantiated except | |
| 1736 // as part of a ParkEvent. | |
| 1737 // Equivalently we could have defined a platform-independent base-class that | |
| 1738 // exported Allocate(), Release(), etc. The platform-specific class would extend | |
| 1739 // that base-class, adding park(), unpark(), etc. | |
| 1740 // | |
| 1741 // A word of caution: The JVM uses 2 very similar constructs: | |
| 1742 // 1. ParkEvent are used for Java-level "monitor" synchronization. | |
| 1743 // 2. Parkers are used by JSR166-JUC park-unpark. | |
| 1744 // | |
| 1745 // We'll want to eventually merge these redundant facilities and use ParkEvent. | |
| 1746 | |
| 1747 | |
| 1748 class ParkEvent : public os::PlatformEvent { | |
| 1749 private: | |
| 1750 ParkEvent * FreeNext ; | |
| 1751 | |
| 1752 // Current association | |
| 1753 Thread * AssociatedWith ; | |
| 1754 intptr_t RawThreadIdentity ; // LWPID etc | |
| 1755 volatile int Incarnation ; | |
| 1756 | |
| 1757 // diagnostic : keep track of last thread to wake this thread. | |
| 1758 // this is useful for construction of dependency graphs. | |
| 1759 void * LastWaker ; | |
| 1760 | |
| 1761 public: | |
| 1762 // MCS-CLH list linkage and Native Mutex/Monitor | |
| 1763 ParkEvent * volatile ListNext ; | |
| 1764 ParkEvent * volatile ListPrev ; | |
| 1765 volatile intptr_t OnList ; | |
| 1766 volatile int TState ; | |
| 1767 volatile int Notified ; // for native monitor construct | |
| 1768 volatile int IsWaiting ; // Enqueued on WaitSet | |
| 1769 | |
| 1770 | |
| 1771 private: | |
| 1772 static ParkEvent * volatile FreeList ; | |
| 1773 static volatile int ListLock ; | |
| 1774 | |
| 1775 // It's prudent to mark the dtor as "private" | |
| 1776 // ensuring that it's not visible outside the package. | |
| 1777 // Unfortunately gcc warns about such usage, so | |
| 1778 // we revert to the less desirable "protected" visibility. | |
| 1779 // The other compilers accept private dtors. | |
| 1780 | |
| 1781 protected: // Ensure dtor is never invoked | |
| 1782 ~ParkEvent() { guarantee (0, "invariant") ; } | |
| 1783 | |
| 1784 ParkEvent() : PlatformEvent() { | |
| 1785 AssociatedWith = NULL ; | |
| 1786 FreeNext = NULL ; | |
| 1787 ListNext = NULL ; | |
| 1788 ListPrev = NULL ; | |
| 1789 OnList = 0 ; | |
| 1790 TState = 0 ; | |
| 1791 Notified = 0 ; | |
| 1792 IsWaiting = 0 ; | |
| 1793 } | |
| 1794 | |
| 1795 // We use placement-new to force ParkEvent instances to be | |
| 1796 // aligned on 256-byte address boundaries. This ensures that the least | |
| 1797 // significant byte of a ParkEvent address is always 0. | |
| 1798 | |
| 1799 void * operator new (size_t sz) ; | |
| 1800 void operator delete (void * a) ; | |
| 1801 | |
| 1802 public: | |
| 1803 static ParkEvent * Allocate (Thread * t) ; | |
| 1804 static void Release (ParkEvent * e) ; | |
| 1805 } ; |