Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.hpp @ 1483:ba37b9335e1e
New option "-graal" that sets up the correct boot class path and C1X options using only the two environment variables MAXINE and GRAAL.
This greatly simplifies command line arguments necessary to start the Graal VM.
| author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
|---|---|
| date | Mon, 29 Nov 2010 16:58:26 +0100 |
| parents | abc670a709dc |
| children | 2d26b0046e0d |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright 1997-2010 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 | |
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51 // - NamedThread |
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52 // - VMThread |
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53 // - ConcurrentGCThread |
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54 // - WorkerThread |
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55 // - GangWorker |
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56 // - GCTaskThread |
| 0 | 57 // - JavaThread |
| 58 // - WatcherThread | |
| 59 | |
| 60 class Thread: public ThreadShadow { | |
| 61 friend class VMStructs; | |
| 62 private: | |
| 63 // Exception handling | |
| 64 // (Note: _pending_exception and friends are in ThreadShadow) | |
| 65 //oop _pending_exception; // pending exception for current thread | |
| 66 // const char* _exception_file; // file information for exception (debugging only) | |
| 67 // int _exception_line; // line information for exception (debugging only) | |
| 68 | |
| 69 // Support for forcing alignment of thread objects for biased locking | |
| 70 void* _real_malloc_address; | |
| 71 public: | |
| 72 void* operator new(size_t size); | |
| 73 void operator delete(void* p); | |
| 74 private: | |
| 75 | |
| 76 // *************************************************************** | |
| 77 // Suspend and resume support | |
| 78 // *************************************************************** | |
| 79 // | |
| 80 // VM suspend/resume no longer exists - it was once used for various | |
| 81 // things including safepoints but was deprecated and finally removed | |
| 82 // in Java 7. Because VM suspension was considered "internal" Java-level | |
| 83 // suspension was considered "external", and this legacy naming scheme | |
| 84 // remains. | |
| 85 // | |
| 86 // External suspend/resume requests come from JVM_SuspendThread, | |
| 87 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
| 88 // ResumeThread. External | |
| 89 // suspend requests cause _external_suspend to be set and external | |
| 90 // resume requests cause _external_suspend to be cleared. | |
| 91 // External suspend requests do not nest on top of other external | |
| 92 // suspend requests. The higher level APIs reject suspend requests | |
| 93 // for already suspended threads. | |
| 94 // | |
| 95 // The external_suspend | |
| 96 // flag is checked by has_special_runtime_exit_condition() and java thread | |
| 97 // will self-suspend when handle_special_runtime_exit_condition() is | |
| 98 // called. Most uses of the _thread_blocked state in JavaThreads are | |
| 99 // considered the same as being externally suspended; if the blocking | |
| 100 // condition lifts, the JavaThread will self-suspend. Other places | |
| 101 // where VM checks for external_suspend include: | |
| 102 // + mutex granting (do not enter monitors when thread is suspended) | |
| 103 // + state transitions from _thread_in_native | |
| 104 // | |
| 105 // In general, java_suspend() does not wait for an external suspend | |
| 106 // request to complete. When it returns, the only guarantee is that | |
| 107 // the _external_suspend field is true. | |
| 108 // | |
| 109 // wait_for_ext_suspend_completion() is used to wait for an external | |
| 110 // suspend request to complete. External suspend requests are usually | |
| 111 // followed by some other interface call that requires the thread to | |
| 112 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
| 113 // the interface that requires quiescence, we give the JavaThread a | |
| 114 // chance to self-suspend before we need it to be quiescent. This | |
| 115 // improves overall suspend/query performance. | |
| 116 // | |
| 117 // _suspend_flags controls the behavior of java_ suspend/resume. | |
| 118 // It must be set under the protection of SR_lock. Read from the flag is | |
| 119 // OK without SR_lock as long as the value is only used as a hint. | |
| 120 // (e.g., check _external_suspend first without lock and then recheck | |
| 121 // inside SR_lock and finish the suspension) | |
| 122 // | |
| 123 // _suspend_flags is also overloaded for other "special conditions" so | |
| 124 // that a single check indicates whether any special action is needed | |
| 125 // eg. for async exceptions. | |
| 126 // ------------------------------------------------------------------- | |
| 127 // Notes: | |
| 128 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
| 129 // but we still update its value to keep other part of the system (mainly | |
| 130 // JVMTI) happy. ThreadState is legacy code (see notes in | |
| 131 // osThread.hpp). | |
| 132 // | |
| 133 // 2. It would be more natural if set_external_suspend() is private and | |
| 134 // part of java_suspend(), but that probably would affect the suspend/query | |
| 135 // performance. Need more investigation on this. | |
| 136 // | |
| 137 | |
| 138 // suspend/resume lock: used for self-suspend | |
| 139 Monitor* _SR_lock; | |
| 140 | |
| 141 protected: | |
| 142 enum SuspendFlags { | |
| 143 // NOTE: avoid using the sign-bit as cc generates different test code | |
| 144 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
| 145 | |
| 146 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
| 147 _ext_suspended = 0x40000000U, // thread has self-suspended | |
| 148 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
| 149 | |
| 150 _has_async_exception = 0x00000001U // there is a pending async exception | |
| 151 }; | |
| 152 | |
| 153 // various suspension related flags - atomically updated | |
| 154 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
| 155 volatile uint32_t _suspend_flags; | |
| 156 | |
| 157 private: | |
| 158 int _num_nested_signal; | |
| 159 | |
| 160 public: | |
| 161 void enter_signal_handler() { _num_nested_signal++; } | |
| 162 void leave_signal_handler() { _num_nested_signal--; } | |
| 163 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } | |
| 164 | |
| 165 private: | |
| 166 // Debug tracing | |
| 167 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
| 168 | |
| 169 // Active_handles points to a block of handles | |
| 170 JNIHandleBlock* _active_handles; | |
| 171 | |
| 172 // One-element thread local free list | |
| 173 JNIHandleBlock* _free_handle_block; | |
| 174 | |
| 175 // Point to the last handle mark | |
| 176 HandleMark* _last_handle_mark; | |
| 177 | |
| 178 // The parity of the last strong_roots iteration in which this thread was | |
| 179 // claimed as a task. | |
| 180 jint _oops_do_parity; | |
| 181 | |
| 182 public: | |
| 183 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
| 184 HandleMark* last_handle_mark() const { return _last_handle_mark; } | |
| 185 private: | |
| 186 | |
| 187 // debug support for checking if code does allow safepoints or not | |
| 188 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
| 189 // mutex, or blocking on an object synchronizer (Java locking). | |
| 190 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
| 191 // If !allow_allocation(), then an assertion failure will happen during allocation | |
| 192 // (Hence, !allow_safepoint() => !allow_allocation()). | |
| 193 // | |
| 194 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
| 195 // | |
| 196 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen | |
| 197 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. | |
| 198 | |
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199 // Used by SkipGCALot class. |
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200 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? |
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201 |
| 0 | 202 // Record when GC is locked out via the GC_locker mechanism |
| 203 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) | |
| 204 | |
| 205 friend class No_Alloc_Verifier; | |
| 206 friend class No_Safepoint_Verifier; | |
| 207 friend class Pause_No_Safepoint_Verifier; | |
| 208 friend class ThreadLocalStorage; | |
| 209 friend class GC_locker; | |
| 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; } | |
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257 virtual bool is_Named_thread() const { return false; } |
| 0 | 258 |
| 259 virtual char* name() const { return (char*)"Unknown thread"; } | |
| 260 | |
| 261 // Returns the current thread | |
| 262 static inline Thread* current(); | |
| 263 | |
| 264 // Common thread operations | |
| 265 static void set_priority(Thread* thread, ThreadPriority priority); | |
| 266 static ThreadPriority get_priority(const Thread* const thread); | |
| 267 static void start(Thread* thread); | |
| 268 static void interrupt(Thread* thr); | |
| 269 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
| 270 | |
| 271 Monitor* SR_lock() const { return _SR_lock; } | |
| 272 | |
| 273 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
| 274 | |
| 275 void set_suspend_flag(SuspendFlags f) { | |
| 276 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 277 uint32_t flags; | |
| 278 do { | |
| 279 flags = _suspend_flags; | |
| 280 } | |
| 281 while (Atomic::cmpxchg((jint)(flags | f), | |
| 282 (volatile jint*)&_suspend_flags, | |
| 283 (jint)flags) != (jint)flags); | |
| 284 } | |
| 285 void clear_suspend_flag(SuspendFlags f) { | |
| 286 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 287 uint32_t flags; | |
| 288 do { | |
| 289 flags = _suspend_flags; | |
| 290 } | |
| 291 while (Atomic::cmpxchg((jint)(flags & ~f), | |
| 292 (volatile jint*)&_suspend_flags, | |
| 293 (jint)flags) != (jint)flags); | |
| 294 } | |
| 295 | |
| 296 void set_has_async_exception() { | |
| 297 set_suspend_flag(_has_async_exception); | |
| 298 } | |
| 299 void clear_has_async_exception() { | |
| 300 clear_suspend_flag(_has_async_exception); | |
| 301 } | |
| 302 | |
| 303 // Support for Unhandled Oop detection | |
| 304 #ifdef CHECK_UNHANDLED_OOPS | |
| 305 private: | |
| 306 UnhandledOops *_unhandled_oops; | |
| 307 public: | |
| 308 UnhandledOops* unhandled_oops() { return _unhandled_oops; } | |
| 309 // Mark oop safe for gc. It may be stack allocated but won't move. | |
| 310 void allow_unhandled_oop(oop *op) { | |
| 311 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); | |
| 312 } | |
| 313 // Clear oops at safepoint so crashes point to unhandled oop violator | |
| 314 void clear_unhandled_oops() { | |
| 315 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); | |
| 316 } | |
| 317 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
| 318 #endif // CHECK_UNHANDLED_OOPS | |
| 319 | |
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320 #ifndef PRODUCT |
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321 bool skip_gcalot() { return _skip_gcalot; } |
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322 void set_skip_gcalot(bool v) { _skip_gcalot = v; } |
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323 #endif |
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324 |
| 0 | 325 public: |
| 326 // Installs a pending exception to be inserted later | |
| 327 static void send_async_exception(oop thread_oop, oop java_throwable); | |
| 328 | |
| 329 // Resource area | |
| 330 ResourceArea* resource_area() const { return _resource_area; } | |
| 331 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
| 332 | |
| 333 OSThread* osthread() const { return _osthread; } | |
| 334 void set_osthread(OSThread* thread) { _osthread = thread; } | |
| 335 | |
| 336 // JNI handle support | |
| 337 JNIHandleBlock* active_handles() const { return _active_handles; } | |
| 338 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
| 339 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
| 340 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
| 341 | |
| 342 // Internal handle support | |
| 343 HandleArea* handle_area() const { return _handle_area; } | |
| 344 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
| 345 | |
| 346 // Thread-Local Allocation Buffer (TLAB) support | |
| 347 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
| 348 void initialize_tlab() { | |
| 349 if (UseTLAB) { | |
| 350 tlab().initialize(); | |
| 351 } | |
| 352 } | |
| 353 | |
| 354 // VM operation support | |
| 355 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
| 356 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
| 357 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
| 358 | |
| 359 // For tracking the heavyweight monitor the thread is pending on. | |
| 360 ObjectMonitor* current_pending_monitor() { | |
| 361 return _current_pending_monitor; | |
| 362 } | |
| 363 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
| 364 _current_pending_monitor = monitor; | |
| 365 } | |
| 366 void set_current_pending_monitor_is_from_java(bool from_java) { | |
| 367 _current_pending_monitor_is_from_java = from_java; | |
| 368 } | |
| 369 bool current_pending_monitor_is_from_java() { | |
| 370 return _current_pending_monitor_is_from_java; | |
| 371 } | |
| 372 | |
| 373 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
| 374 ObjectMonitor* current_waiting_monitor() { | |
| 375 return _current_waiting_monitor; | |
| 376 } | |
| 377 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
| 378 _current_waiting_monitor = monitor; | |
| 379 } | |
| 380 | |
| 381 // GC support | |
| 382 // Apply "f->do_oop" to all root oops in "this". | |
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383 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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384 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 385 |
| 386 // Handles the parallel case for the method below. | |
| 387 private: | |
| 388 bool claim_oops_do_par_case(int collection_parity); | |
| 389 public: | |
| 390 // Requires that "collection_parity" is that of the current strong roots | |
| 391 // iteration. If "is_par" is false, sets the parity of "this" to | |
| 392 // "collection_parity", and returns "true". If "is_par" is true, | |
| 393 // uses an atomic instruction to set the current threads parity to | |
| 394 // "collection_parity", if it is not already. Returns "true" iff the | |
| 395 // calling thread does the update, this indicates that the calling thread | |
| 396 // has claimed the thread's stack as a root groop in the current | |
| 397 // collection. | |
| 398 bool claim_oops_do(bool is_par, int collection_parity) { | |
| 399 if (!is_par) { | |
| 400 _oops_do_parity = collection_parity; | |
| 401 return true; | |
| 402 } else { | |
| 403 return claim_oops_do_par_case(collection_parity); | |
| 404 } | |
| 405 } | |
| 406 | |
| 407 // Sweeper support | |
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408 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 409 |
| 410 // Tells if adr belong to this thread. This is used | |
| 411 // for checking if a lock is owned by the running thread. | |
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412 |
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413 // Used by fast lock support |
| 0 | 414 virtual bool is_lock_owned(address adr) const; |
| 415 | |
| 416 // Check if address is in the stack of the thread (not just for locks). | |
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417 // Warning: the method can only be used on the running thread |
| 0 | 418 bool is_in_stack(address adr) const; |
| 419 | |
| 420 // Sets this thread as starting thread. Returns failure if thread | |
| 421 // creation fails due to lack of memory, too many threads etc. | |
| 422 bool set_as_starting_thread(); | |
| 423 | |
| 424 protected: | |
| 425 // OS data associated with the thread | |
| 426 OSThread* _osthread; // Platform-specific thread information | |
| 427 | |
| 428 // Thread local resource area for temporary allocation within the VM | |
| 429 ResourceArea* _resource_area; | |
| 430 | |
| 431 // Thread local handle area for allocation of handles within the VM | |
| 432 HandleArea* _handle_area; | |
| 433 | |
| 434 // Support for stack overflow handling, get_thread, etc. | |
| 435 address _stack_base; | |
| 436 size_t _stack_size; | |
| 437 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
| 438 int _lgrp_id; | |
| 439 | |
| 440 public: | |
| 441 // Stack overflow support | |
| 442 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
| 443 | |
| 444 void set_stack_base(address base) { _stack_base = base; } | |
| 445 size_t stack_size() const { return _stack_size; } | |
| 446 void set_stack_size(size_t size) { _stack_size = size; } | |
| 447 void record_stack_base_and_size(); | |
| 448 | |
| 449 int lgrp_id() const { return _lgrp_id; } | |
| 450 void set_lgrp_id(int value) { _lgrp_id = value; } | |
| 451 | |
| 452 // Printing | |
| 453 void print_on(outputStream* st) const; | |
| 454 void print() const { print_on(tty); } | |
| 455 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 456 | |
| 457 // Debug-only code | |
| 458 | |
| 459 #ifdef ASSERT | |
| 460 private: | |
| 461 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
| 462 Monitor *_owned_locks; | |
| 463 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, | |
| 464 // thus the friendship | |
| 465 friend class Mutex; | |
| 466 friend class Monitor; | |
| 467 | |
| 468 public: | |
| 469 void print_owned_locks_on(outputStream* st) const; | |
| 470 void print_owned_locks() const { print_owned_locks_on(tty); } | |
| 471 Monitor * owned_locks() const { return _owned_locks; } | |
| 472 bool owns_locks() const { return owned_locks() != NULL; } | |
| 473 bool owns_locks_but_compiled_lock() const; | |
| 474 | |
| 475 // Deadlock detection | |
| 476 bool allow_allocation() { return _allow_allocation_count == 0; } | |
| 477 #endif | |
| 478 | |
| 479 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
| 480 | |
| 481 private: | |
| 482 volatile int _jvmti_env_iteration_count; | |
| 483 | |
| 484 public: | |
| 485 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
| 486 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
| 487 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
| 488 | |
| 489 // Code generation | |
| 490 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
| 491 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
| 492 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
| 493 | |
| 494 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
| 495 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
| 496 static ByteSize omFreeList_offset() { return byte_offset_of(Thread, omFreeList); } | |
| 497 | |
| 498 #define TLAB_FIELD_OFFSET(name) \ | |
| 499 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } | |
| 500 | |
| 501 TLAB_FIELD_OFFSET(start) | |
| 502 TLAB_FIELD_OFFSET(end) | |
| 503 TLAB_FIELD_OFFSET(top) | |
| 504 TLAB_FIELD_OFFSET(pf_top) | |
| 505 TLAB_FIELD_OFFSET(size) // desired_size | |
| 506 TLAB_FIELD_OFFSET(refill_waste_limit) | |
| 507 TLAB_FIELD_OFFSET(number_of_refills) | |
| 508 TLAB_FIELD_OFFSET(fast_refill_waste) | |
| 509 TLAB_FIELD_OFFSET(slow_allocations) | |
| 510 | |
| 511 #undef TLAB_FIELD_OFFSET | |
| 512 | |
| 513 public: | |
| 514 volatile intptr_t _Stalled ; | |
| 515 volatile int _TypeTag ; | |
| 516 ParkEvent * _ParkEvent ; // for synchronized() | |
| 517 ParkEvent * _SleepEvent ; // for Thread.sleep | |
| 518 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
| 519 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
| 520 int NativeSyncRecursion ; // diagnostic | |
| 521 | |
| 522 volatile int _OnTrap ; // Resume-at IP delta | |
| 523 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
| 524 jint _hashStateX ; // thread-specific hashCode generator state | |
| 525 jint _hashStateY ; | |
| 526 jint _hashStateZ ; | |
| 527 void * _schedctl ; | |
| 528 | |
| 529 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
| 530 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
| 531 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
| 532 | |
| 533 volatile jint rng [4] ; // RNG for spin loop | |
| 534 | |
| 535 // Low-level leaf-lock primitives used to implement synchronization | |
| 536 // and native monitor-mutex infrastructure. | |
| 537 // Not for general synchronization use. | |
| 538 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
| 539 static void SpinRelease (volatile int * Lock) ; | |
| 540 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
| 541 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
| 542 static void muxRelease (volatile intptr_t * Lock) ; | |
| 543 | |
| 544 }; | |
| 545 | |
| 546 // Inline implementation of Thread::current() | |
| 547 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
| 548 // startup. | |
| 549 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
| 550 // period. This is inlined in thread_<os_family>.inline.hpp. | |
| 551 | |
| 552 inline Thread* Thread::current() { | |
| 553 #ifdef ASSERT | |
| 554 // This function is very high traffic. Define PARANOID to enable expensive | |
| 555 // asserts. | |
| 556 #ifdef PARANOID | |
| 557 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
| 558 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
| 559 assert(t != NULL && !t->is_inside_signal_handler(), | |
| 560 "Don't use Thread::current() inside signal handler"); | |
| 561 #endif | |
| 562 #endif | |
| 563 Thread* thread = ThreadLocalStorage::thread(); | |
| 564 assert(thread != NULL, "just checking"); | |
| 565 return thread; | |
| 566 } | |
| 567 | |
| 568 // Name support for threads. non-JavaThread subclasses with multiple | |
| 569 // uniquely named instances should derive from this. | |
| 570 class NamedThread: public Thread { | |
| 571 friend class VMStructs; | |
| 572 enum { | |
| 573 max_name_len = 64 | |
| 574 }; | |
| 575 private: | |
| 576 char* _name; | |
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577 // log JavaThread being processed by oops_do |
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578 JavaThread* _processed_thread; |
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579 |
| 0 | 580 public: |
| 581 NamedThread(); | |
| 582 ~NamedThread(); | |
| 583 // May only be called once per thread. | |
| 584 void set_name(const char* format, ...); | |
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585 virtual bool is_Named_thread() const { return true; } |
| 0 | 586 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
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587 JavaThread *processed_thread() { return _processed_thread; } |
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588 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } |
| 0 | 589 }; |
| 590 | |
| 591 // Worker threads are named and have an id of an assigned work. | |
| 592 class WorkerThread: public NamedThread { | |
| 593 private: | |
| 594 uint _id; | |
| 595 public: | |
| 596 WorkerThread() : _id(0) { } | |
| 597 void set_id(uint work_id) { _id = work_id; } | |
| 598 uint id() const { return _id; } | |
| 599 }; | |
| 600 | |
| 601 // A single WatcherThread is used for simulating timer interrupts. | |
| 602 class WatcherThread: public Thread { | |
| 603 friend class VMStructs; | |
| 604 public: | |
| 605 virtual void run(); | |
| 606 | |
| 607 private: | |
| 608 static WatcherThread* _watcher_thread; | |
| 609 | |
| 610 static bool _should_terminate; | |
| 611 public: | |
| 612 enum SomeConstants { | |
| 613 delay_interval = 10 // interrupt delay in milliseconds | |
| 614 }; | |
| 615 | |
| 616 // Constructor | |
| 617 WatcherThread(); | |
| 618 | |
| 619 // Tester | |
| 620 bool is_Watcher_thread() const { return true; } | |
| 621 | |
| 622 // Printing | |
| 623 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
| 624 void print_on(outputStream* st) const; | |
| 625 void print() const { print_on(tty); } | |
| 626 | |
| 627 // Returns the single instance of WatcherThread | |
| 628 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
| 629 | |
| 630 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
| 631 static void start(); | |
| 632 static void stop(); | |
| 633 }; | |
| 634 | |
| 635 | |
| 636 class CompilerThread; | |
| 637 | |
| 638 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
| 639 | |
| 640 class JavaThread: public Thread { | |
| 641 friend class VMStructs; | |
| 642 private: | |
| 643 JavaThread* _next; // The next thread in the Threads list | |
| 644 oop _threadObj; // The Java level thread object | |
| 645 | |
| 646 #ifdef ASSERT | |
| 647 private: | |
| 648 int _java_call_counter; | |
| 649 | |
| 650 public: | |
| 651 int java_call_counter() { return _java_call_counter; } | |
| 652 void inc_java_call_counter() { _java_call_counter++; } | |
| 653 void dec_java_call_counter() { | |
| 654 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
| 655 _java_call_counter--; | |
| 656 } | |
| 657 private: // restore original namespace restriction | |
| 658 #endif // ifdef ASSERT | |
| 659 | |
| 660 #ifndef PRODUCT | |
| 661 public: | |
| 662 enum { | |
| 663 jump_ring_buffer_size = 16 | |
| 664 }; | |
| 665 private: // restore original namespace restriction | |
| 666 #endif | |
| 667 | |
| 668 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
| 669 | |
| 670 ThreadFunction _entry_point; | |
| 671 | |
| 672 JNIEnv _jni_environment; | |
| 673 | |
| 674 // Deopt support | |
| 675 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
| 676 | |
| 677 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
| 678 // transition out of native | |
| 679 | |
| 680 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays | |
| 681 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
| 682 // Because deoptimization is lazy we must save jvmti requests to set locals | |
| 683 // in compiled frames until we deoptimize and we have an interpreter frame. | |
| 684 // This holds the pointer to array (yeah like there might be more than one) of | |
| 685 // description of compiled vframes that have locals that need to be updated. | |
| 686 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
| 687 | |
| 688 // Handshake value for fixing 6243940. We need a place for the i2c | |
| 689 // adapter to store the callee methodOop. This value is NEVER live | |
| 690 // across a gc point so it does NOT have to be gc'd | |
| 691 // The handshake is open ended since we can't be certain that it will | |
| 692 // be NULLed. This is because we rarely ever see the race and end up | |
| 693 // in handle_wrong_method which is the backend of the handshake. See | |
| 694 // code in i2c adapters and handle_wrong_method. | |
| 695 | |
| 696 methodOop _callee_target; | |
| 697 | |
| 698 // Oop results of VM runtime calls | |
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699 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved |
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700 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved |
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701 |
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702 // See ReduceInitialCardMarks: this holds the precise space interval of |
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703 // the most recent slow path allocation for which compiled code has |
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704 // elided card-marks for performance along the fast-path. |
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705 MemRegion _deferred_card_mark; |
| 0 | 706 |
| 707 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
| 708 // allocated during deoptimization | |
| 709 // and by JNI_MonitorEnter/Exit | |
| 710 | |
| 711 // Async. requests support | |
| 712 enum AsyncRequests { | |
| 713 _no_async_condition = 0, | |
| 714 _async_exception, | |
| 715 _async_unsafe_access_error | |
| 716 }; | |
| 717 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
| 718 oop _pending_async_exception; | |
| 719 | |
| 720 // Safepoint support | |
| 721 public: // Expose _thread_state for SafeFetchInt() | |
| 722 volatile JavaThreadState _thread_state; | |
| 723 private: | |
| 724 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
| 725 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
| 726 | |
| 727 // JavaThread termination support | |
| 728 enum TerminatedTypes { | |
| 729 _not_terminated = 0xDEAD - 2, | |
| 730 _thread_exiting, // JavaThread::exit() has been called for this thread | |
| 731 _thread_terminated, // JavaThread is removed from thread list | |
| 732 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
| 733 // only VM_Exit can set _vm_exited | |
| 734 }; | |
| 735 | |
| 736 // In general a JavaThread's _terminated field transitions as follows: | |
| 737 // | |
| 738 // _not_terminated => _thread_exiting => _thread_terminated | |
| 739 // | |
| 740 // _vm_exited is a special value to cover the case of a JavaThread | |
| 741 // executing native code after the VM itself is terminated. | |
| 742 TerminatedTypes _terminated; | |
| 743 // suspend/resume support | |
| 744 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
| 745 jint _in_deopt_handler; // count of deoptimization | |
| 746 // handlers thread is in | |
| 747 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
| 748 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
| 749 // never locked) when throwing an exception. Used by interpreter only. | |
| 750 | |
| 751 // Flag to mark a JNI thread in the process of attaching - See CR 6404306 | |
| 752 // This flag is never set true other than at construction, and in that case | |
| 753 // is shortly thereafter set false | |
| 754 volatile bool _is_attaching; | |
| 755 | |
| 756 public: | |
| 757 // State of the stack guard pages for this thread. | |
| 758 enum StackGuardState { | |
| 759 stack_guard_unused, // not needed | |
| 760 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
| 761 stack_guard_enabled // enabled | |
| 762 }; | |
| 763 | |
| 764 private: | |
| 765 | |
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766 // c1x needs some place to put the dimensions |
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767 jint c1x_multinewarray_storage[256]; |
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768 |
| 0 | 769 StackGuardState _stack_guard_state; |
| 770 | |
| 771 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
| 772 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
| 773 // code) | |
| 774 volatile oop _exception_oop; // Exception thrown in compiled code | |
| 775 volatile address _exception_pc; // PC where exception happened | |
| 776 volatile address _exception_handler_pc; // PC for handler of exception | |
| 777 volatile int _exception_stack_size; // Size of frame where exception happened | |
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778 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. |
| 0 | 779 |
| 780 // support for compilation | |
| 781 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) | |
| 782 | |
| 783 // support for JNI critical regions | |
| 784 jint _jni_active_critical; // count of entries into JNI critical region | |
| 785 | |
| 786 // For deadlock detection. | |
| 787 int _depth_first_number; | |
| 788 | |
| 789 // JVMTI PopFrame support | |
| 790 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
| 791 int _popframe_condition; | |
| 792 | |
| 793 #ifndef PRODUCT | |
| 794 int _jmp_ring_index; | |
| 795 struct { | |
| 796 // We use intptr_t instead of address so debugger doesn't try and display strings | |
| 797 intptr_t _target; | |
| 798 intptr_t _instruction; | |
| 799 const char* _file; | |
| 800 int _line; | |
| 801 } _jmp_ring[ jump_ring_buffer_size ]; | |
| 802 #endif /* PRODUCT */ | |
| 803 | |
| 342 | 804 #ifndef SERIALGC |
| 805 // Support for G1 barriers | |
| 806 | |
| 807 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
| 808 // Set of all such queues. | |
| 809 static SATBMarkQueueSet _satb_mark_queue_set; | |
| 810 | |
| 811 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
| 812 // Set of all such queues. | |
| 813 static DirtyCardQueueSet _dirty_card_queue_set; | |
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815 void flush_barrier_queues(); |
| 342 | 816 #endif // !SERIALGC |
| 817 | |
| 0 | 818 friend class VMThread; |
| 819 friend class ThreadWaitTransition; | |
| 820 friend class VM_Exit; | |
| 821 | |
| 822 void initialize(); // Initialized the instance variables | |
| 823 | |
| 824 public: | |
| 825 // Constructor | |
| 826 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads | |
| 827 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); | |
| 828 ~JavaThread(); | |
| 829 | |
| 830 #ifdef ASSERT | |
| 831 // verify this JavaThread hasn't be published in the Threads::list yet | |
| 832 void verify_not_published(); | |
| 833 #endif | |
| 834 | |
| 835 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
| 836 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
| 837 _jni_environment.functions = functionTable; | |
| 838 } | |
| 839 struct JNINativeInterface_* get_jni_functions() { | |
| 840 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
| 841 } | |
| 842 | |
| 843 // Executes Shutdown.shutdown() | |
| 844 void invoke_shutdown_hooks(); | |
| 845 | |
| 846 // Cleanup on thread exit | |
| 847 enum ExitType { | |
| 848 normal_exit, | |
| 849 jni_detach | |
| 850 }; | |
| 851 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
| 852 | |
| 853 void cleanup_failed_attach_current_thread(); | |
| 854 | |
| 855 // Testers | |
| 856 virtual bool is_Java_thread() const { return true; } | |
| 857 | |
| 858 // compilation | |
| 859 void set_is_compiling(bool f) { _is_compiling = f; } | |
| 860 bool is_compiling() const { return _is_compiling; } | |
| 861 | |
| 862 // Thread chain operations | |
| 863 JavaThread* next() const { return _next; } | |
| 864 void set_next(JavaThread* p) { _next = p; } | |
| 865 | |
| 866 // Thread oop. threadObj() can be NULL for initial JavaThread | |
| 867 // (or for threads attached via JNI) | |
| 868 oop threadObj() const { return _threadObj; } | |
| 869 void set_threadObj(oop p) { _threadObj = p; } | |
| 870 | |
| 871 ThreadPriority java_priority() const; // Read from threadObj() | |
| 872 | |
| 873 // Prepare thread and add to priority queue. If a priority is | |
| 874 // not specified, use the priority of the thread object. Threads_lock | |
| 875 // must be held while this function is called. | |
| 876 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
| 877 | |
| 878 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
| 879 address saved_exception_pc() { return _saved_exception_pc; } | |
| 880 | |
| 881 | |
| 882 ThreadFunction entry_point() const { return _entry_point; } | |
| 883 | |
| 884 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
| 885 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
| 886 | |
| 887 // Last frame anchor routines | |
| 888 | |
| 889 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
| 890 | |
| 891 // last_Java_sp | |
| 892 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
| 893 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
| 894 | |
| 895 // last_Java_pc | |
| 896 | |
| 897 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
| 898 | |
| 899 // Safepoint support | |
| 900 JavaThreadState thread_state() const { return _thread_state; } | |
| 901 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
| 902 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
| 903 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
| 904 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
| 905 | |
| 906 // thread has called JavaThread::exit() or is terminated | |
| 907 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
| 908 // thread is terminated (no longer on the threads list); we compare | |
| 909 // against the two non-terminated values so that a freed JavaThread | |
| 910 // will also be considered terminated. | |
| 911 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
| 912 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
| 913 // special for Threads::remove() which is static: | |
| 914 void set_terminated_value() { _terminated = _thread_terminated; } | |
| 915 void block_if_vm_exited(); | |
| 916 | |
| 917 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
| 918 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
| 919 | |
| 920 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
| 921 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
| 922 | |
| 923 | |
| 924 // Suspend/resume support for JavaThread | |
| 925 | |
| 926 private: | |
| 927 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
| 928 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
| 929 | |
| 930 public: | |
| 931 void java_suspend(); | |
| 932 void java_resume(); | |
| 933 int java_suspend_self(); | |
| 934 | |
| 935 void check_and_wait_while_suspended() { | |
| 936 assert(JavaThread::current() == this, "sanity check"); | |
| 937 | |
| 938 bool do_self_suspend; | |
| 939 do { | |
| 940 // were we externally suspended while we were waiting? | |
| 941 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
| 942 if (do_self_suspend) { | |
| 943 // don't surprise the thread that suspended us by returning | |
| 944 java_suspend_self(); | |
| 945 set_suspend_equivalent(); | |
| 946 } | |
| 947 } while (do_self_suspend); | |
| 948 } | |
| 949 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
| 950 // Check for async exception in addition to safepoint and suspend request. | |
| 951 static void check_special_condition_for_native_trans(JavaThread *thread); | |
| 952 | |
| 953 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
| 954 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
| 955 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 956 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 957 // SR_lock to allow the thread to reach a stable thread state if | |
| 958 // it is currently in a transient thread state. | |
| 959 return is_ext_suspend_completed(false /*!called_by_wait */, | |
| 960 SuspendRetryDelay, bits); | |
| 961 } | |
| 962 | |
| 963 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
| 964 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
| 965 // passed as the count and delay parameters. Experiments with specific | |
| 966 // calls to wait_for_ext_suspend_completion() can be done by passing | |
| 967 // other values in the code. Experiments with all calls can be done | |
| 968 // via the appropriate -XX options. | |
| 969 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
| 970 | |
| 971 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
| 972 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
| 973 | |
| 974 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
| 975 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
| 976 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
| 977 | |
| 978 bool is_external_suspend() const { | |
| 979 return (_suspend_flags & _external_suspend) != 0; | |
| 980 } | |
| 981 // Whenever a thread transitions from native to vm/java it must suspend | |
| 982 // if external|deopt suspend is present. | |
| 983 bool is_suspend_after_native() const { | |
| 984 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
| 985 } | |
| 986 | |
| 987 // external suspend request is completed | |
| 988 bool is_ext_suspended() const { | |
| 989 return (_suspend_flags & _ext_suspended) != 0; | |
| 990 } | |
| 991 | |
| 992 bool is_external_suspend_with_lock() const { | |
| 993 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 994 return is_external_suspend(); | |
| 995 } | |
| 996 | |
| 997 // Special method to handle a pending external suspend request | |
| 998 // when a suspend equivalent condition lifts. | |
| 999 bool handle_special_suspend_equivalent_condition() { | |
| 1000 assert(is_suspend_equivalent(), | |
| 1001 "should only be called in a suspend equivalence condition"); | |
| 1002 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1003 bool ret = is_external_suspend(); | |
| 1004 if (!ret) { | |
| 1005 // not about to self-suspend so clear suspend equivalence | |
| 1006 clear_suspend_equivalent(); | |
| 1007 } | |
| 1008 // implied else: | |
| 1009 // We have a pending external suspend request so we leave the | |
| 1010 // suspend_equivalent flag set until java_suspend_self() sets | |
| 1011 // the ext_suspended flag and clears the suspend_equivalent | |
| 1012 // flag. This insures that wait_for_ext_suspend_completion() | |
| 1013 // will return consistent values. | |
| 1014 return ret; | |
| 1015 } | |
| 1016 | |
| 1017 // utility methods to see if we are doing some kind of suspension | |
| 1018 bool is_being_ext_suspended() const { | |
| 1019 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1020 return is_ext_suspended() || is_external_suspend(); | |
| 1021 } | |
| 1022 | |
| 1023 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
| 1024 | |
| 1025 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
| 1026 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
| 1027 | |
| 1028 // Thread.stop support | |
| 1029 void send_thread_stop(oop throwable); | |
| 1030 AsyncRequests clear_special_runtime_exit_condition() { | |
| 1031 AsyncRequests x = _special_runtime_exit_condition; | |
| 1032 _special_runtime_exit_condition = _no_async_condition; | |
| 1033 return x; | |
| 1034 } | |
| 1035 | |
| 1036 // Are any async conditions present? | |
| 1037 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
| 1038 | |
| 1039 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
| 1040 | |
| 1041 // these next two are also used for self-suspension and async exception support | |
| 1042 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
| 1043 | |
| 1044 // Return true if JavaThread has an asynchronous condition or | |
| 1045 // if external suspension is requested. | |
| 1046 bool has_special_runtime_exit_condition() { | |
| 1047 // We call is_external_suspend() last since external suspend should | |
| 1048 // be less common. Because we don't use is_external_suspend_with_lock | |
| 1049 // it is possible that we won't see an asynchronous external suspend | |
| 1050 // request that has just gotten started, i.e., SR_lock grabbed but | |
| 1051 // _external_suspend field change either not made yet or not visible | |
| 1052 // yet. However, this is okay because the request is asynchronous and | |
| 1053 // we will see the new flag value the next time through. It's also | |
| 1054 // possible that the external suspend request is dropped after | |
| 1055 // we have checked is_external_suspend(), we will recheck its value | |
| 1056 // under SR_lock in java_suspend_self(). | |
| 1057 return (_special_runtime_exit_condition != _no_async_condition) || | |
| 1058 is_external_suspend() || is_deopt_suspend(); | |
| 1059 } | |
| 1060 | |
| 1061 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
| 1062 | |
| 1063 void set_pending_async_exception(oop e) { | |
| 1064 _pending_async_exception = e; | |
| 1065 _special_runtime_exit_condition = _async_exception; | |
| 1066 set_has_async_exception(); | |
| 1067 } | |
| 1068 | |
| 1069 // Fast-locking support | |
| 1070 bool is_lock_owned(address adr) const; | |
| 1071 | |
| 1072 // Accessors for vframe array top | |
| 1073 // The linked list of vframe arrays are sorted on sp. This means when we | |
| 1074 // unpack the head must contain the vframe array to unpack. | |
| 1075 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
| 1076 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
| 1077 | |
| 1078 // Side structure for defering update of java frame locals until deopt occurs | |
| 1079 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
| 1080 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
| 1081 | |
| 1082 // These only really exist to make debugging deopt problems simpler | |
| 1083 | |
| 1084 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
| 1085 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
| 1086 | |
| 1087 // The special resourceMark used during deoptimization | |
| 1088 | |
| 1089 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
| 1090 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
| 1091 | |
| 1092 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
| 1093 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
| 1094 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
| 1095 | |
| 1096 methodOop callee_target() const { return _callee_target; } | |
| 1097 void set_callee_target (methodOop x) { _callee_target = x; } | |
| 1098 | |
| 1099 // Oop results of vm runtime calls | |
| 1100 oop vm_result() const { return _vm_result; } | |
| 1101 void set_vm_result (oop x) { _vm_result = x; } | |
| 1102 | |
| 1103 oop vm_result_2() const { return _vm_result_2; } | |
| 1104 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
| 1105 | |
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1106 MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
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1107 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
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1108 |
| 0 | 1109 // Exception handling for compiled methods |
| 1110 oop exception_oop() const { return _exception_oop; } | |
| 1111 int exception_stack_size() const { return _exception_stack_size; } | |
| 1112 address exception_pc() const { return _exception_pc; } | |
| 1113 address exception_handler_pc() const { return _exception_handler_pc; } | |
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1114 bool is_method_handle_return() const { return _is_method_handle_return == 1; } |
| 0 | 1115 |
| 1116 void set_exception_oop(oop o) { _exception_oop = o; } | |
| 1117 void set_exception_pc(address a) { _exception_pc = a; } | |
| 1118 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
| 1119 void set_exception_stack_size(int size) { _exception_stack_size = size; } | |
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1120 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } |
| 0 | 1121 |
| 1122 // Stack overflow support | |
| 1123 inline size_t stack_available(address cur_sp); | |
| 1124 address stack_yellow_zone_base() | |
| 1125 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
| 1126 size_t stack_yellow_zone_size() | |
| 1127 { return StackYellowPages * os::vm_page_size(); } | |
| 1128 address stack_red_zone_base() | |
| 1129 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
| 1130 size_t stack_red_zone_size() | |
| 1131 { return StackRedPages * os::vm_page_size(); } | |
| 1132 bool in_stack_yellow_zone(address a) | |
| 1133 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
| 1134 bool in_stack_red_zone(address a) | |
| 1135 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
| 1136 | |
| 1137 void create_stack_guard_pages(); | |
| 1138 void remove_stack_guard_pages(); | |
| 1139 | |
| 1140 void enable_stack_yellow_zone(); | |
| 1141 void disable_stack_yellow_zone(); | |
| 1142 void enable_stack_red_zone(); | |
| 1143 void disable_stack_red_zone(); | |
| 1144 | |
| 1145 inline bool stack_yellow_zone_disabled(); | |
| 1146 inline bool stack_yellow_zone_enabled(); | |
| 1147 | |
| 1148 // Attempt to reguard the stack after a stack overflow may have occurred. | |
| 1149 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
| 1150 // pages are already guarded, or (c) the pages were successfully reguarded. | |
| 1151 // Returns false if there is not enough stack space to reguard the pages, in | |
| 1152 // which case the caller should unwind a frame and try again. The argument | |
| 1153 // should be the caller's (approximate) sp. | |
| 1154 bool reguard_stack(address cur_sp); | |
| 1155 // Similar to above but see if current stackpoint is out of the guard area | |
| 1156 // and reguard if possible. | |
| 1157 bool reguard_stack(void); | |
| 1158 | |
| 1159 // Misc. accessors/mutators | |
| 1160 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
| 1161 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
| 1162 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
| 1163 | |
| 1164 #ifndef PRODUCT | |
| 1165 void record_jump(address target, address instr, const char* file, int line); | |
| 1166 #endif /* PRODUCT */ | |
| 1167 | |
| 1168 // For assembly stub generation | |
| 1169 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
| 1170 #ifndef PRODUCT | |
| 1171 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
| 1172 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
| 1173 #endif /* PRODUCT */ | |
| 1174 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
| 1175 static ByteSize last_Java_sp_offset() { | |
| 1176 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
| 1177 } | |
| 1178 static ByteSize last_Java_pc_offset() { | |
| 1179 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
| 1180 } | |
| 1181 static ByteSize frame_anchor_offset() { | |
| 1182 return byte_offset_of(JavaThread, _anchor); | |
| 1183 } | |
| 1184 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
| 1185 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
| 1186 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
| 1187 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
| 1188 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
| 1189 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
| 1190 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
| 1191 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
| 1192 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
| 1193 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); } | |
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1194 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } |
| 0 | 1195 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
| 1196 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
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1197 static ByteSize c1x_multinewarray_storage_offset() { return byte_offset_of(JavaThread, c1x_multinewarray_storage); } |
| 0 | 1198 |
| 1199 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
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1200 static ByteSize should_post_on_exceptions_flag_offset() { |
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1201 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); |
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1202 } |
| 0 | 1203 |
| 342 | 1204 #ifndef SERIALGC |
| 1205 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
| 1206 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
| 1207 #endif // !SERIALGC | |
| 1208 | |
| 0 | 1209 // Returns the jni environment for this thread |
| 1210 JNIEnv* jni_environment() { return &_jni_environment; } | |
| 1211 | |
| 1212 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
| 1213 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
| 1214 // Only return NULL if thread is off the thread list; starting to | |
| 1215 // exit should not return NULL. | |
| 1216 if (thread_from_jni_env->is_terminated()) { | |
| 1217 thread_from_jni_env->block_if_vm_exited(); | |
| 1218 return NULL; | |
| 1219 } else { | |
| 1220 return thread_from_jni_env; | |
| 1221 } | |
| 1222 } | |
| 1223 | |
| 1224 // JNI critical regions. These can nest. | |
| 1225 bool in_critical() { return _jni_active_critical > 0; } | |
| 1226 void enter_critical() { assert(Thread::current() == this, | |
| 1227 "this must be current thread"); | |
| 1228 _jni_active_critical++; } | |
| 1229 void exit_critical() { assert(Thread::current() == this, | |
| 1230 "this must be current thread"); | |
| 1231 _jni_active_critical--; | |
| 1232 assert(_jni_active_critical >= 0, | |
| 1233 "JNI critical nesting problem?"); } | |
| 1234 | |
| 1235 // For deadlock detection | |
| 1236 int depth_first_number() { return _depth_first_number; } | |
| 1237 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
| 1238 | |
| 1239 private: | |
| 1240 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
| 1241 | |
| 1242 public: | |
| 1243 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
| 1244 void add_monitor_chunk(MonitorChunk* chunk); | |
| 1245 void remove_monitor_chunk(MonitorChunk* chunk); | |
| 1246 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
| 1247 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
| 1248 void dec_in_deopt_handler() { | |
| 1249 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
| 1250 if (_in_deopt_handler > 0) { // robustness | |
| 1251 _in_deopt_handler--; | |
| 1252 } | |
| 1253 } | |
| 1254 | |
| 1255 private: | |
| 1256 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
| 1257 | |
| 1258 public: | |
| 1259 | |
| 1260 // Frame iteration; calls the function f for all frames on the stack | |
| 1261 void frames_do(void f(frame*, const RegisterMap*)); | |
| 1262 | |
| 1263 // Memory operations | |
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1264 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1265 |
| 1266 // Sweeper operations | |
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1267 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1268 |
| 1269 // Memory management operations | |
| 1270 void gc_epilogue(); | |
| 1271 void gc_prologue(); | |
| 1272 | |
| 1273 // Misc. operations | |
| 1274 char* name() const { return (char*)get_thread_name(); } | |
| 1275 void print_on(outputStream* st) const; | |
| 1276 void print() const { print_on(tty); } | |
| 1277 void print_value(); | |
| 1278 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
| 1279 void print_thread_state() const PRODUCT_RETURN; | |
| 1280 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 1281 void verify(); | |
| 1282 const char* get_thread_name() const; | |
| 1283 private: | |
| 1284 // factor out low-level mechanics for use in both normal and error cases | |
| 1285 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
| 1286 public: | |
| 1287 const char* get_threadgroup_name() const; | |
| 1288 const char* get_parent_name() const; | |
| 1289 | |
| 1290 // Accessing frames | |
| 1291 frame last_frame() { | |
| 1292 _anchor.make_walkable(this); | |
| 1293 return pd_last_frame(); | |
| 1294 } | |
| 1295 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
| 1296 | |
| 1297 // Returns method at 'depth' java or native frames down the stack | |
| 1298 // Used for security checks | |
| 1299 klassOop security_get_caller_class(int depth); | |
| 1300 | |
| 1301 // Print stack trace in external format | |
| 1302 void print_stack_on(outputStream* st); | |
| 1303 void print_stack() { print_stack_on(tty); } | |
| 1304 | |
| 1305 // Print stack traces in various internal formats | |
| 1306 void trace_stack() PRODUCT_RETURN; | |
| 1307 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
| 1308 void trace_frames() PRODUCT_RETURN; | |
| 1309 | |
| 1310 // Returns the number of stack frames on the stack | |
| 1311 int depth() const; | |
| 1312 | |
| 1313 // Function for testing deoptimization | |
| 1314 void deoptimize(); | |
| 1315 void make_zombies(); | |
| 1316 | |
| 1317 void deoptimized_wrt_marked_nmethods(); | |
| 1318 | |
| 1319 // Profiling operation (see fprofile.cpp) | |
| 1320 public: | |
| 1321 bool profile_last_Java_frame(frame* fr); | |
| 1322 | |
| 1323 private: | |
| 1324 ThreadProfiler* _thread_profiler; | |
| 1325 private: | |
| 1326 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
| 1327 friend class FlatProfilerTask; // uses get_thread_profiler. | |
| 1328 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
| 1329 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
| 1330 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
| 1331 ThreadProfiler* result = _thread_profiler; | |
| 1332 _thread_profiler = tp; | |
| 1333 return result; | |
| 1334 } | |
| 1335 | |
| 1336 // Static operations | |
| 1337 public: | |
| 1338 // Returns the running thread as a JavaThread | |
| 1339 static inline JavaThread* current(); | |
| 1340 | |
| 1341 // Returns the active Java thread. Do not use this if you know you are calling | |
| 1342 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
| 1343 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
| 1344 // operation. You may not want that either. | |
| 1345 static JavaThread* active(); | |
| 1346 | |
| 1347 inline CompilerThread* as_CompilerThread(); | |
| 1348 | |
| 1349 public: | |
| 1350 virtual void run(); | |
| 1351 void thread_main_inner(); | |
| 1352 | |
| 1353 private: | |
| 1354 // PRIVILEGED STACK | |
| 1355 PrivilegedElement* _privileged_stack_top; | |
| 1356 GrowableArray<oop>* _array_for_gc; | |
| 1357 public: | |
| 1358 | |
| 1359 // Returns the privileged_stack information. | |
| 1360 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
| 1361 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
| 1362 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
| 1363 | |
| 1364 public: | |
| 1365 // Thread local information maintained by JVMTI. | |
| 1366 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
|
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1367 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1368 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1369 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1370 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1371 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1372 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1373 // the specified JavaThread is exiting. |
| 0 | 1374 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
| 1375 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
| 1376 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
| 1377 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
| 1378 | |
| 1379 // JVMTI PopFrame support | |
| 1380 // Setting and clearing popframe_condition | |
| 1381 // All of these enumerated values are bits. popframe_pending | |
| 1382 // indicates that a PopFrame() has been requested and not yet been | |
| 1383 // completed. popframe_processing indicates that that PopFrame() is in | |
| 1384 // the process of being completed. popframe_force_deopt_reexecution_bit | |
| 1385 // indicates that special handling is required when returning to a | |
| 1386 // deoptimized caller. | |
| 1387 enum PopCondition { | |
| 1388 popframe_inactive = 0x00, | |
| 1389 popframe_pending_bit = 0x01, | |
| 1390 popframe_processing_bit = 0x02, | |
| 1391 popframe_force_deopt_reexecution_bit = 0x04 | |
| 1392 }; | |
| 1393 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
| 1394 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
| 1395 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
| 1396 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
| 1397 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
| 1398 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
| 1399 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
| 1400 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
| 1401 #ifdef CC_INTERP | |
| 1402 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
| 1403 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
| 1404 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
| 1405 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
| 1406 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
| 1407 #endif | |
| 1408 | |
| 1409 private: | |
| 1410 // Saved incoming arguments to popped frame. | |
| 1411 // Used only when popped interpreted frame returns to deoptimized frame. | |
| 1412 void* _popframe_preserved_args; | |
| 1413 int _popframe_preserved_args_size; | |
| 1414 | |
| 1415 public: | |
| 1416 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
| 1417 void* popframe_preserved_args(); | |
| 1418 ByteSize popframe_preserved_args_size(); | |
| 1419 WordSize popframe_preserved_args_size_in_words(); | |
| 1420 void popframe_free_preserved_args(); | |
| 1421 | |
| 1422 | |
| 1423 private: | |
| 1424 JvmtiThreadState *_jvmti_thread_state; | |
| 1425 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
| 1426 | |
| 1427 // Used by the interpreter in fullspeed mode for frame pop, method | |
| 1428 // entry, method exit and single stepping support. This field is | |
| 1429 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
| 1430 // It can be set to zero asynchronously (i.e., without a VM operation | |
| 1431 // or a lock) so we have to be very careful. | |
| 1432 int _interp_only_mode; | |
| 1433 | |
| 1434 public: | |
| 1435 // used by the interpreter for fullspeed debugging support (see above) | |
| 1436 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
| 1437 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
| 1438 int get_interp_only_mode() { return _interp_only_mode; } | |
| 1439 void increment_interp_only_mode() { ++_interp_only_mode; } | |
| 1440 void decrement_interp_only_mode() { --_interp_only_mode; } | |
| 1441 | |
|
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1442 // support for cached flag that indicates whether exceptions need to be posted for this thread |
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1443 // if this is false, we can avoid deoptimizing when events are thrown |
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1444 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
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1445 private: |
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1446 int _should_post_on_exceptions_flag; |
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1447 |
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1448 public: |
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1449 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
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1450 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
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1451 |
| 0 | 1452 private: |
| 1453 ThreadStatistics *_thread_stat; | |
| 1454 | |
| 1455 public: | |
| 1456 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
| 1457 | |
| 1458 // Return a blocker object for which this thread is blocked parking. | |
| 1459 oop current_park_blocker(); | |
| 1460 | |
| 1461 private: | |
| 1462 static size_t _stack_size_at_create; | |
| 1463 | |
| 1464 public: | |
| 1465 static inline size_t stack_size_at_create(void) { | |
| 1466 return _stack_size_at_create; | |
| 1467 } | |
| 1468 static inline void set_stack_size_at_create(size_t value) { | |
| 1469 _stack_size_at_create = value; | |
| 1470 } | |
| 1471 | |
| 342 | 1472 #ifndef SERIALGC |
| 1473 // SATB marking queue support | |
| 1474 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
| 1475 static SATBMarkQueueSet& satb_mark_queue_set() { | |
| 1476 return _satb_mark_queue_set; | |
| 1477 } | |
| 1478 | |
| 1479 // Dirty card queue support | |
| 1480 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
| 1481 static DirtyCardQueueSet& dirty_card_queue_set() { | |
| 1482 return _dirty_card_queue_set; | |
| 1483 } | |
| 1484 #endif // !SERIALGC | |
| 1485 | |
| 0 | 1486 // Machine dependent stuff |
| 1487 #include "incls/_thread_pd.hpp.incl" | |
| 1488 | |
| 1489 public: | |
| 1490 void set_blocked_on_compilation(bool value) { | |
| 1491 _blocked_on_compilation = value; | |
| 1492 } | |
| 1493 | |
| 1494 bool blocked_on_compilation() { | |
| 1495 return _blocked_on_compilation; | |
| 1496 } | |
| 1497 protected: | |
| 1498 bool _blocked_on_compilation; | |
| 1499 | |
| 1500 | |
| 1501 // JSR166 per-thread parker | |
| 1502 private: | |
| 1503 Parker* _parker; | |
| 1504 public: | |
| 1505 Parker* parker() { return _parker; } | |
| 1506 | |
| 1507 // Biased locking support | |
| 1508 private: | |
| 1509 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
| 1510 public: | |
| 1511 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
| 1512 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
| 1513 | |
| 1514 // clearing/querying jni attach status | |
| 1515 bool is_attaching() const { return _is_attaching; } | |
| 1516 void set_attached() { _is_attaching = false; OrderAccess::fence(); } | |
| 342 | 1517 private: |
| 1518 // This field is used to determine if a thread has claimed | |
| 1519 // a par_id: it is -1 if the thread has not claimed a par_id; | |
| 1520 // otherwise its value is the par_id that has been claimed. | |
| 1521 int _claimed_par_id; | |
| 1522 public: | |
| 1523 int get_claimed_par_id() { return _claimed_par_id; } | |
| 1524 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
| 0 | 1525 }; |
| 1526 | |
| 1527 // Inline implementation of JavaThread::current | |
| 1528 inline JavaThread* JavaThread::current() { | |
| 1529 Thread* thread = ThreadLocalStorage::thread(); | |
| 1530 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
| 1531 return (JavaThread*)thread; | |
| 1532 } | |
| 1533 | |
| 1534 inline CompilerThread* JavaThread::as_CompilerThread() { | |
| 1535 assert(is_Compiler_thread(), "just checking"); | |
| 1536 return (CompilerThread*)this; | |
| 1537 } | |
| 1538 | |
| 1539 inline bool JavaThread::stack_yellow_zone_disabled() { | |
| 1540 return _stack_guard_state == stack_guard_yellow_disabled; | |
| 1541 } | |
| 1542 | |
| 1543 inline bool JavaThread::stack_yellow_zone_enabled() { | |
| 1544 #ifdef ASSERT | |
| 1545 if (os::uses_stack_guard_pages()) { | |
| 1546 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
| 1547 } | |
| 1548 #endif | |
| 1549 return _stack_guard_state == stack_guard_enabled; | |
| 1550 } | |
| 1551 | |
| 1552 inline size_t JavaThread::stack_available(address cur_sp) { | |
| 1553 // This code assumes java stacks grow down | |
| 1554 address low_addr; // Limit on the address for deepest stack depth | |
| 1555 if ( _stack_guard_state == stack_guard_unused) { | |
| 1556 low_addr = stack_base() - stack_size(); | |
| 1557 } else { | |
| 1558 low_addr = stack_yellow_zone_base(); | |
| 1559 } | |
| 1560 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
| 1561 } | |
| 1562 | |
| 1563 // A JavaThread for low memory detection support | |
| 1564 class LowMemoryDetectorThread : public JavaThread { | |
| 1565 friend class VMStructs; | |
| 1566 public: | |
| 1567 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; | |
| 1568 | |
| 1569 // Hide this thread from external view. | |
| 1570 bool is_hidden_from_external_view() const { return true; } | |
| 1571 }; | |
| 1572 | |
| 1573 // A thread used for Compilation. | |
| 1574 class CompilerThread : public JavaThread { | |
| 1575 friend class VMStructs; | |
| 1576 private: | |
| 1577 CompilerCounters* _counters; | |
| 1578 | |
| 1579 ciEnv* _env; | |
| 1580 CompileLog* _log; | |
| 1581 CompileTask* _task; | |
| 1582 CompileQueue* _queue; | |
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1583 bool _is_compiling; |
| 0 | 1584 |
| 1585 public: | |
| 1586 | |
| 1587 static CompilerThread* current(); | |
| 1588 | |
| 1589 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
| 1590 | |
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1591 bool is_compiling() const { return _is_compiling; } |
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1592 void set_compiling(bool b) { _is_compiling = b; } |
| 0 | 1593 bool is_Compiler_thread() const { return true; } |
| 1594 // Hide this compiler thread from external view. | |
| 1595 bool is_hidden_from_external_view() const { return true; } | |
| 1596 | |
| 1597 CompileQueue* queue() { return _queue; } | |
| 1598 CompilerCounters* counters() { return _counters; } | |
| 1599 | |
| 1600 // Get/set the thread's compilation environment. | |
| 1601 ciEnv* env() { return _env; } | |
| 1602 void set_env(ciEnv* env) { _env = env; } | |
| 1603 | |
| 1604 // Get/set the thread's logging information | |
| 1605 CompileLog* log() { return _log; } | |
| 1606 void init_log(CompileLog* log) { | |
| 1607 // Set once, for good. | |
| 1608 assert(_log == NULL, "set only once"); | |
| 1609 _log = log; | |
| 1610 } | |
| 1611 | |
| 1612 #ifndef PRODUCT | |
| 1613 private: | |
| 1614 IdealGraphPrinter *_ideal_graph_printer; | |
| 1615 public: | |
| 1616 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
| 1617 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
| 1618 #endif | |
| 1619 | |
| 1620 // Get/set the thread's current task | |
| 1621 CompileTask* task() { return _task; } | |
| 1622 void set_task(CompileTask* task) { _task = task; } | |
| 1623 }; | |
| 1624 | |
| 1625 inline CompilerThread* CompilerThread::current() { | |
| 1626 return JavaThread::current()->as_CompilerThread(); | |
| 1627 } | |
| 1628 | |
| 1629 | |
| 1630 // The active thread queue. It also keeps track of the current used | |
| 1631 // thread priorities. | |
| 1632 class Threads: AllStatic { | |
| 1633 friend class VMStructs; | |
| 1634 private: | |
| 1635 static JavaThread* _thread_list; | |
| 1636 static int _number_of_threads; | |
| 1637 static int _number_of_non_daemon_threads; | |
| 1638 static int _return_code; | |
| 1639 | |
| 1640 public: | |
| 1641 // Thread management | |
| 1642 // force_daemon is a concession to JNI, where we may need to add a | |
| 1643 // thread to the thread list before allocating its thread object | |
| 1644 static void add(JavaThread* p, bool force_daemon = false); | |
| 1645 static void remove(JavaThread* p); | |
| 1646 static bool includes(JavaThread* p); | |
| 1647 static JavaThread* first() { return _thread_list; } | |
| 1648 static void threads_do(ThreadClosure* tc); | |
| 1649 | |
| 1650 // Initializes the vm and creates the vm thread | |
| 1651 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
| 1652 static void convert_vm_init_libraries_to_agents(); | |
| 1653 static void create_vm_init_libraries(); | |
| 1654 static void create_vm_init_agents(); | |
| 1655 static void shutdown_vm_agents(); | |
| 1656 static bool destroy_vm(); | |
| 1657 // Supported VM versions via JNI | |
| 1658 // Includes JNI_VERSION_1_1 | |
| 1659 static jboolean is_supported_jni_version_including_1_1(jint version); | |
| 1660 // Does not include JNI_VERSION_1_1 | |
| 1661 static jboolean is_supported_jni_version(jint version); | |
| 1662 | |
| 1663 // Garbage collection | |
| 1664 static void follow_other_roots(void f(oop*)); | |
| 1665 | |
| 1666 // Apply "f->do_oop" to all root oops in all threads. | |
| 1667 // This version may only be called by sequential code. | |
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1668 static void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1669 // This version may be called by sequential or parallel code. |
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1670 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1671 // This creates a list of GCTasks, one per thread. |
| 1672 static void create_thread_roots_tasks(GCTaskQueue* q); | |
| 1673 // This creates a list of GCTasks, one per thread, for marking objects. | |
| 1674 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
| 1675 | |
| 1676 // Apply "f->do_oop" to roots in all threads that | |
| 1677 // are part of compiled frames | |
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1678 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1679 |
| 1680 static void convert_hcode_pointers(); | |
| 1681 static void restore_hcode_pointers(); | |
| 1682 | |
| 1683 // Sweeper | |
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1684 static void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1685 |
| 1686 static void gc_epilogue(); | |
| 1687 static void gc_prologue(); | |
| 1688 | |
| 1689 // Verification | |
| 1690 static void verify(); | |
| 1691 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
| 1692 static void print(bool print_stacks, bool internal_format) { | |
| 1693 // this function is only used by debug.cpp | |
| 1694 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
| 1695 } | |
| 1696 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
| 1697 | |
| 1698 // Get Java threads that are waiting to enter a monitor. If doLock | |
| 1699 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1700 // VM needs to be at a safepoint. | |
| 1701 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
| 1702 address monitor, bool doLock); | |
| 1703 | |
| 1704 // Get owning Java thread from the monitor's owner field. If doLock | |
| 1705 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1706 // VM needs to be at a safepoint. | |
| 1707 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
| 1708 bool doLock); | |
| 1709 | |
| 1710 // Number of threads on the active threads list | |
| 1711 static int number_of_threads() { return _number_of_threads; } | |
| 1712 // Number of non-daemon threads on the active threads list | |
| 1713 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
| 1714 | |
| 1715 // Deoptimizes all frames tied to marked nmethods | |
| 1716 static void deoptimized_wrt_marked_nmethods(); | |
| 1717 | |
| 1718 }; | |
| 1719 | |
| 1720 | |
| 1721 // Thread iterator | |
| 1722 class ThreadClosure: public StackObj { | |
| 1723 public: | |
| 1724 virtual void do_thread(Thread* thread) = 0; | |
| 1725 }; | |
| 1726 | |
| 1727 class SignalHandlerMark: public StackObj { | |
| 1728 private: | |
| 1729 Thread* _thread; | |
| 1730 public: | |
| 1731 SignalHandlerMark(Thread* t) { | |
| 1732 _thread = t; | |
| 1733 if (_thread) _thread->enter_signal_handler(); | |
| 1734 } | |
| 1735 ~SignalHandlerMark() { | |
| 1736 if (_thread) _thread->leave_signal_handler(); | |
| 1737 _thread = NULL; | |
| 1738 } | |
| 1739 }; | |
| 1740 | |
| 1741 // ParkEvents are type-stable and immortal. | |
| 1742 // | |
| 1743 // Lifecycle: Once a ParkEvent is associated with a thread that ParkEvent remains | |
| 1744 // associated with the thread for the thread's entire lifetime - the relationship is | |
| 1745 // stable. A thread will be associated at most one ParkEvent. When the thread | |
| 1746 // expires, the ParkEvent moves to the EventFreeList. New threads attempt to allocate from | |
| 1747 // the EventFreeList before creating a new Event. Type-stability frees us from | |
| 1748 // worrying about stale Event or Thread references in the objectMonitor subsystem. | |
| 1749 // (A reference to ParkEvent is always valid, even though the event may no longer be associated | |
| 1750 // with the desired or expected thread. A key aspect of this design is that the callers of | |
| 1751 // park, unpark, etc must tolerate stale references and spurious wakeups). | |
| 1752 // | |
| 1753 // Only the "associated" thread can block (park) on the ParkEvent, although | |
| 1754 // any other thread can unpark a reachable parkevent. Park() is allowed to | |
| 1755 // return spuriously. In fact park-unpark a really just an optimization to | |
| 1756 // avoid unbounded spinning and surrender the CPU to be a polite system citizen. | |
| 1757 // A degenerate albeit "impolite" park-unpark implementation could simply return. | |
| 1758 // See http://blogs.sun.com/dave for more details. | |
| 1759 // | |
| 1760 // Eventually I'd like to eliminate Events and ObjectWaiters, both of which serve as | |
| 1761 // thread proxies, and simply make the THREAD structure type-stable and persistent. | |
| 1762 // Currently, we unpark events associated with threads, but ideally we'd just | |
| 1763 // unpark threads. | |
| 1764 // | |
| 1765 // The base-class, PlatformEvent, is platform-specific while the ParkEvent is | |
| 1766 // platform-independent. PlatformEvent provides park(), unpark(), etc., and | |
| 1767 // is abstract -- that is, a PlatformEvent should never be instantiated except | |
| 1768 // as part of a ParkEvent. | |
| 1769 // Equivalently we could have defined a platform-independent base-class that | |
| 1770 // exported Allocate(), Release(), etc. The platform-specific class would extend | |
| 1771 // that base-class, adding park(), unpark(), etc. | |
| 1772 // | |
| 1773 // A word of caution: The JVM uses 2 very similar constructs: | |
| 1774 // 1. ParkEvent are used for Java-level "monitor" synchronization. | |
| 1775 // 2. Parkers are used by JSR166-JUC park-unpark. | |
| 1776 // | |
| 1777 // We'll want to eventually merge these redundant facilities and use ParkEvent. | |
| 1778 | |
| 1779 | |
| 1780 class ParkEvent : public os::PlatformEvent { | |
| 1781 private: | |
| 1782 ParkEvent * FreeNext ; | |
| 1783 | |
| 1784 // Current association | |
| 1785 Thread * AssociatedWith ; | |
| 1786 intptr_t RawThreadIdentity ; // LWPID etc | |
| 1787 volatile int Incarnation ; | |
| 1788 | |
| 1789 // diagnostic : keep track of last thread to wake this thread. | |
| 1790 // this is useful for construction of dependency graphs. | |
| 1791 void * LastWaker ; | |
| 1792 | |
| 1793 public: | |
| 1794 // MCS-CLH list linkage and Native Mutex/Monitor | |
| 1795 ParkEvent * volatile ListNext ; | |
| 1796 ParkEvent * volatile ListPrev ; | |
| 1797 volatile intptr_t OnList ; | |
| 1798 volatile int TState ; | |
| 1799 volatile int Notified ; // for native monitor construct | |
| 1800 volatile int IsWaiting ; // Enqueued on WaitSet | |
| 1801 | |
| 1802 | |
| 1803 private: | |
| 1804 static ParkEvent * volatile FreeList ; | |
| 1805 static volatile int ListLock ; | |
| 1806 | |
| 1807 // It's prudent to mark the dtor as "private" | |
| 1808 // ensuring that it's not visible outside the package. | |
| 1809 // Unfortunately gcc warns about such usage, so | |
| 1810 // we revert to the less desirable "protected" visibility. | |
| 1811 // The other compilers accept private dtors. | |
| 1812 | |
| 1813 protected: // Ensure dtor is never invoked | |
| 1814 ~ParkEvent() { guarantee (0, "invariant") ; } | |
| 1815 | |
| 1816 ParkEvent() : PlatformEvent() { | |
| 1817 AssociatedWith = NULL ; | |
| 1818 FreeNext = NULL ; | |
| 1819 ListNext = NULL ; | |
| 1820 ListPrev = NULL ; | |
| 1821 OnList = 0 ; | |
| 1822 TState = 0 ; | |
| 1823 Notified = 0 ; | |
| 1824 IsWaiting = 0 ; | |
| 1825 } | |
| 1826 | |
| 1827 // We use placement-new to force ParkEvent instances to be | |
| 1828 // aligned on 256-byte address boundaries. This ensures that the least | |
| 1829 // significant byte of a ParkEvent address is always 0. | |
| 1830 | |
| 1831 void * operator new (size_t sz) ; | |
| 1832 void operator delete (void * a) ; | |
| 1833 | |
| 1834 public: | |
| 1835 static ParkEvent * Allocate (Thread * t) ; | |
| 1836 static void Release (ParkEvent * e) ; | |
| 1837 } ; |