Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/thread.hpp @ 2044:06f017f7daa7
Merge.
| author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
|---|---|
| date | Fri, 07 Jan 2011 18:18:08 +0100 |
| parents | 2d26b0046e0d fd1d227ef1b9 |
| children | 91fe28b03d6a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP |
| 26 #define SHARE_VM_RUNTIME_THREAD_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "memory/threadLocalAllocBuffer.hpp" | |
| 30 #include "oops/oop.hpp" | |
| 31 #include "prims/jni.h" | |
| 32 #include "prims/jvmtiExport.hpp" | |
| 33 #include "runtime/frame.hpp" | |
| 34 #include "runtime/javaFrameAnchor.hpp" | |
| 35 #include "runtime/jniHandles.hpp" | |
| 36 #include "runtime/mutexLocker.hpp" | |
| 37 #include "runtime/os.hpp" | |
| 38 #include "runtime/osThread.hpp" | |
| 39 #include "runtime/park.hpp" | |
| 40 #include "runtime/safepoint.hpp" | |
| 41 #include "runtime/stubRoutines.hpp" | |
| 42 #include "runtime/threadLocalStorage.hpp" | |
| 43 #include "runtime/unhandledOops.hpp" | |
| 44 #include "utilities/exceptions.hpp" | |
| 45 #include "utilities/top.hpp" | |
| 46 #ifndef SERIALGC | |
| 47 #include "gc_implementation/g1/dirtyCardQueue.hpp" | |
| 48 #include "gc_implementation/g1/satbQueue.hpp" | |
| 49 #endif | |
| 50 #ifdef ZERO | |
| 51 #ifdef TARGET_ARCH_zero | |
| 52 # include "stack_zero.hpp" | |
| 53 #endif | |
| 54 #endif | |
| 55 | |
| 0 | 56 class ThreadSafepointState; |
| 57 class ThreadProfiler; | |
| 58 | |
| 59 class JvmtiThreadState; | |
| 60 class JvmtiGetLoadedClassesClosure; | |
| 61 class ThreadStatistics; | |
| 62 class ConcurrentLocksDump; | |
| 63 class ParkEvent ; | |
| 1878 | 64 class Parker; |
| 0 | 65 |
| 66 class ciEnv; | |
| 67 class CompileThread; | |
| 68 class CompileLog; | |
| 69 class CompileTask; | |
| 70 class CompileQueue; | |
| 71 class CompilerCounters; | |
| 72 class vframeArray; | |
| 73 | |
| 74 class DeoptResourceMark; | |
| 75 class jvmtiDeferredLocalVariableSet; | |
| 76 | |
| 77 class GCTaskQueue; | |
| 78 class ThreadClosure; | |
| 79 class IdealGraphPrinter; | |
| 80 | |
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81 class WorkerThread; |
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82 |
| 0 | 83 // Class hierarchy |
| 84 // - Thread | |
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85 // - NamedThread |
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86 // - VMThread |
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87 // - ConcurrentGCThread |
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88 // - WorkerThread |
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89 // - GangWorker |
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90 // - GCTaskThread |
| 0 | 91 // - JavaThread |
| 92 // - WatcherThread | |
| 93 | |
| 94 class Thread: public ThreadShadow { | |
| 95 friend class VMStructs; | |
| 96 private: | |
| 97 // Exception handling | |
| 98 // (Note: _pending_exception and friends are in ThreadShadow) | |
| 99 //oop _pending_exception; // pending exception for current thread | |
| 100 // const char* _exception_file; // file information for exception (debugging only) | |
| 101 // int _exception_line; // line information for exception (debugging only) | |
| 102 | |
| 103 // Support for forcing alignment of thread objects for biased locking | |
| 104 void* _real_malloc_address; | |
| 105 public: | |
| 106 void* operator new(size_t size); | |
| 107 void operator delete(void* p); | |
| 108 private: | |
| 109 | |
| 110 // *************************************************************** | |
| 111 // Suspend and resume support | |
| 112 // *************************************************************** | |
| 113 // | |
| 114 // VM suspend/resume no longer exists - it was once used for various | |
| 115 // things including safepoints but was deprecated and finally removed | |
| 116 // in Java 7. Because VM suspension was considered "internal" Java-level | |
| 117 // suspension was considered "external", and this legacy naming scheme | |
| 118 // remains. | |
| 119 // | |
| 120 // External suspend/resume requests come from JVM_SuspendThread, | |
| 121 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
| 122 // ResumeThread. External | |
| 123 // suspend requests cause _external_suspend to be set and external | |
| 124 // resume requests cause _external_suspend to be cleared. | |
| 125 // External suspend requests do not nest on top of other external | |
| 126 // suspend requests. The higher level APIs reject suspend requests | |
| 127 // for already suspended threads. | |
| 128 // | |
| 129 // The external_suspend | |
| 130 // flag is checked by has_special_runtime_exit_condition() and java thread | |
| 131 // will self-suspend when handle_special_runtime_exit_condition() is | |
| 132 // called. Most uses of the _thread_blocked state in JavaThreads are | |
| 133 // considered the same as being externally suspended; if the blocking | |
| 134 // condition lifts, the JavaThread will self-suspend. Other places | |
| 135 // where VM checks for external_suspend include: | |
| 136 // + mutex granting (do not enter monitors when thread is suspended) | |
| 137 // + state transitions from _thread_in_native | |
| 138 // | |
| 139 // In general, java_suspend() does not wait for an external suspend | |
| 140 // request to complete. When it returns, the only guarantee is that | |
| 141 // the _external_suspend field is true. | |
| 142 // | |
| 143 // wait_for_ext_suspend_completion() is used to wait for an external | |
| 144 // suspend request to complete. External suspend requests are usually | |
| 145 // followed by some other interface call that requires the thread to | |
| 146 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
| 147 // the interface that requires quiescence, we give the JavaThread a | |
| 148 // chance to self-suspend before we need it to be quiescent. This | |
| 149 // improves overall suspend/query performance. | |
| 150 // | |
| 151 // _suspend_flags controls the behavior of java_ suspend/resume. | |
| 152 // It must be set under the protection of SR_lock. Read from the flag is | |
| 153 // OK without SR_lock as long as the value is only used as a hint. | |
| 154 // (e.g., check _external_suspend first without lock and then recheck | |
| 155 // inside SR_lock and finish the suspension) | |
| 156 // | |
| 157 // _suspend_flags is also overloaded for other "special conditions" so | |
| 158 // that a single check indicates whether any special action is needed | |
| 159 // eg. for async exceptions. | |
| 160 // ------------------------------------------------------------------- | |
| 161 // Notes: | |
| 162 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
| 163 // but we still update its value to keep other part of the system (mainly | |
| 164 // JVMTI) happy. ThreadState is legacy code (see notes in | |
| 165 // osThread.hpp). | |
| 166 // | |
| 167 // 2. It would be more natural if set_external_suspend() is private and | |
| 168 // part of java_suspend(), but that probably would affect the suspend/query | |
| 169 // performance. Need more investigation on this. | |
| 170 // | |
| 171 | |
| 172 // suspend/resume lock: used for self-suspend | |
| 173 Monitor* _SR_lock; | |
| 174 | |
| 175 protected: | |
| 176 enum SuspendFlags { | |
| 177 // NOTE: avoid using the sign-bit as cc generates different test code | |
| 178 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
| 179 | |
| 180 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
| 181 _ext_suspended = 0x40000000U, // thread has self-suspended | |
| 182 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
| 183 | |
| 184 _has_async_exception = 0x00000001U // there is a pending async exception | |
| 185 }; | |
| 186 | |
| 187 // various suspension related flags - atomically updated | |
| 188 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
| 189 volatile uint32_t _suspend_flags; | |
| 190 | |
| 191 private: | |
| 192 int _num_nested_signal; | |
| 193 | |
| 194 public: | |
| 195 void enter_signal_handler() { _num_nested_signal++; } | |
| 196 void leave_signal_handler() { _num_nested_signal--; } | |
| 197 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } | |
| 198 | |
| 199 private: | |
| 200 // Debug tracing | |
| 201 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
| 202 | |
| 203 // Active_handles points to a block of handles | |
| 204 JNIHandleBlock* _active_handles; | |
| 205 | |
| 206 // One-element thread local free list | |
| 207 JNIHandleBlock* _free_handle_block; | |
| 208 | |
| 209 // Point to the last handle mark | |
| 210 HandleMark* _last_handle_mark; | |
| 211 | |
| 212 // The parity of the last strong_roots iteration in which this thread was | |
| 213 // claimed as a task. | |
| 214 jint _oops_do_parity; | |
| 215 | |
| 216 public: | |
| 217 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
| 218 HandleMark* last_handle_mark() const { return _last_handle_mark; } | |
| 219 private: | |
| 220 | |
| 221 // debug support for checking if code does allow safepoints or not | |
| 222 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
| 223 // mutex, or blocking on an object synchronizer (Java locking). | |
| 224 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
| 225 // If !allow_allocation(), then an assertion failure will happen during allocation | |
| 226 // (Hence, !allow_safepoint() => !allow_allocation()). | |
| 227 // | |
| 228 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
| 229 // | |
| 230 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen | |
| 231 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. | |
| 232 | |
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233 // Used by SkipGCALot class. |
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234 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? |
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235 |
| 0 | 236 // Record when GC is locked out via the GC_locker mechanism |
| 237 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) | |
| 238 | |
| 239 friend class No_Alloc_Verifier; | |
| 240 friend class No_Safepoint_Verifier; | |
| 241 friend class Pause_No_Safepoint_Verifier; | |
| 242 friend class ThreadLocalStorage; | |
| 243 friend class GC_locker; | |
| 244 | |
| 245 ThreadLocalAllocBuffer _tlab; // Thread-local eden | |
| 246 | |
| 247 int _vm_operation_started_count; // VM_Operation support | |
| 248 int _vm_operation_completed_count; // VM_Operation support | |
| 249 | |
| 250 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread | |
| 251 // is waiting to lock | |
| 252 bool _current_pending_monitor_is_from_java; // locking is from Java code | |
| 253 | |
| 254 // ObjectMonitor on which this thread called Object.wait() | |
| 255 ObjectMonitor* _current_waiting_monitor; | |
| 256 | |
| 257 // Private thread-local objectmonitor list - a simple cache organized as a SLL. | |
| 258 public: | |
| 259 ObjectMonitor * omFreeList ; | |
| 260 int omFreeCount ; // length of omFreeList | |
| 261 int omFreeProvision ; // reload chunk size | |
| 1587 | 262 ObjectMonitor * omInUseList; // SLL to track monitors in circulation |
| 263 int omInUseCount; // length of omInUseList | |
| 0 | 264 |
| 265 public: | |
| 266 enum { | |
| 267 is_definitely_current_thread = true | |
| 268 }; | |
| 269 | |
| 270 // Constructor | |
| 271 Thread(); | |
| 272 virtual ~Thread(); | |
| 273 | |
| 274 // initializtion | |
| 275 void initialize_thread_local_storage(); | |
| 276 | |
| 277 // thread entry point | |
| 278 virtual void run(); | |
| 279 | |
| 280 // Testers | |
| 281 virtual bool is_VM_thread() const { return false; } | |
| 282 virtual bool is_Java_thread() const { return false; } | |
| 283 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 284 virtual bool is_Compiler_thread() const { return false; } | |
| 285 virtual bool is_hidden_from_external_view() const { return false; } | |
| 286 virtual bool is_jvmti_agent_thread() const { return false; } | |
| 287 // True iff the thread can perform GC operations at a safepoint. | |
| 288 // Generally will be true only of VM thread and parallel GC WorkGang | |
| 289 // threads. | |
| 290 virtual bool is_GC_task_thread() const { return false; } | |
| 291 virtual bool is_Watcher_thread() const { return false; } | |
| 292 virtual bool is_ConcurrentGC_thread() const { return false; } | |
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293 virtual bool is_Named_thread() const { return false; } |
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294 virtual bool is_Worker_thread() const { return false; } |
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295 |
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296 // Casts |
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297 virtual WorkerThread* as_Worker_thread() const { return NULL; } |
| 0 | 298 |
| 299 virtual char* name() const { return (char*)"Unknown thread"; } | |
| 300 | |
| 301 // Returns the current thread | |
| 302 static inline Thread* current(); | |
| 303 | |
| 304 // Common thread operations | |
| 305 static void set_priority(Thread* thread, ThreadPriority priority); | |
| 306 static ThreadPriority get_priority(const Thread* const thread); | |
| 307 static void start(Thread* thread); | |
| 308 static void interrupt(Thread* thr); | |
| 309 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
| 310 | |
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311 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } |
| 0 | 312 Monitor* SR_lock() const { return _SR_lock; } |
| 313 | |
| 314 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
| 315 | |
| 316 void set_suspend_flag(SuspendFlags f) { | |
| 317 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 318 uint32_t flags; | |
| 319 do { | |
| 320 flags = _suspend_flags; | |
| 321 } | |
| 322 while (Atomic::cmpxchg((jint)(flags | f), | |
| 323 (volatile jint*)&_suspend_flags, | |
| 324 (jint)flags) != (jint)flags); | |
| 325 } | |
| 326 void clear_suspend_flag(SuspendFlags f) { | |
| 327 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 328 uint32_t flags; | |
| 329 do { | |
| 330 flags = _suspend_flags; | |
| 331 } | |
| 332 while (Atomic::cmpxchg((jint)(flags & ~f), | |
| 333 (volatile jint*)&_suspend_flags, | |
| 334 (jint)flags) != (jint)flags); | |
| 335 } | |
| 336 | |
| 337 void set_has_async_exception() { | |
| 338 set_suspend_flag(_has_async_exception); | |
| 339 } | |
| 340 void clear_has_async_exception() { | |
| 341 clear_suspend_flag(_has_async_exception); | |
| 342 } | |
| 343 | |
| 344 // Support for Unhandled Oop detection | |
| 345 #ifdef CHECK_UNHANDLED_OOPS | |
| 346 private: | |
| 347 UnhandledOops *_unhandled_oops; | |
| 348 public: | |
| 349 UnhandledOops* unhandled_oops() { return _unhandled_oops; } | |
| 350 // Mark oop safe for gc. It may be stack allocated but won't move. | |
| 351 void allow_unhandled_oop(oop *op) { | |
| 352 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); | |
| 353 } | |
| 354 // Clear oops at safepoint so crashes point to unhandled oop violator | |
| 355 void clear_unhandled_oops() { | |
| 356 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); | |
| 357 } | |
| 358 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
| 359 #endif // CHECK_UNHANDLED_OOPS | |
| 360 | |
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361 #ifndef PRODUCT |
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362 bool skip_gcalot() { return _skip_gcalot; } |
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363 void set_skip_gcalot(bool v) { _skip_gcalot = v; } |
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364 #endif |
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365 |
| 0 | 366 public: |
| 367 // Installs a pending exception to be inserted later | |
| 368 static void send_async_exception(oop thread_oop, oop java_throwable); | |
| 369 | |
| 370 // Resource area | |
| 371 ResourceArea* resource_area() const { return _resource_area; } | |
| 372 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
| 373 | |
| 374 OSThread* osthread() const { return _osthread; } | |
| 375 void set_osthread(OSThread* thread) { _osthread = thread; } | |
| 376 | |
| 377 // JNI handle support | |
| 378 JNIHandleBlock* active_handles() const { return _active_handles; } | |
| 379 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
| 380 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
| 381 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
| 382 | |
| 383 // Internal handle support | |
| 384 HandleArea* handle_area() const { return _handle_area; } | |
| 385 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
| 386 | |
| 387 // Thread-Local Allocation Buffer (TLAB) support | |
| 388 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
| 389 void initialize_tlab() { | |
| 390 if (UseTLAB) { | |
| 391 tlab().initialize(); | |
| 392 } | |
| 393 } | |
| 394 | |
| 395 // VM operation support | |
| 396 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
| 397 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
| 398 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
| 399 | |
| 400 // For tracking the heavyweight monitor the thread is pending on. | |
| 401 ObjectMonitor* current_pending_monitor() { | |
| 402 return _current_pending_monitor; | |
| 403 } | |
| 404 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
| 405 _current_pending_monitor = monitor; | |
| 406 } | |
| 407 void set_current_pending_monitor_is_from_java(bool from_java) { | |
| 408 _current_pending_monitor_is_from_java = from_java; | |
| 409 } | |
| 410 bool current_pending_monitor_is_from_java() { | |
| 411 return _current_pending_monitor_is_from_java; | |
| 412 } | |
| 413 | |
| 414 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
| 415 ObjectMonitor* current_waiting_monitor() { | |
| 416 return _current_waiting_monitor; | |
| 417 } | |
| 418 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
| 419 _current_waiting_monitor = monitor; | |
| 420 } | |
| 421 | |
| 422 // GC support | |
| 423 // Apply "f->do_oop" to all root oops in "this". | |
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424 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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425 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 426 |
| 427 // Handles the parallel case for the method below. | |
| 428 private: | |
| 429 bool claim_oops_do_par_case(int collection_parity); | |
| 430 public: | |
| 431 // Requires that "collection_parity" is that of the current strong roots | |
| 432 // iteration. If "is_par" is false, sets the parity of "this" to | |
| 433 // "collection_parity", and returns "true". If "is_par" is true, | |
| 434 // uses an atomic instruction to set the current threads parity to | |
| 435 // "collection_parity", if it is not already. Returns "true" iff the | |
| 436 // calling thread does the update, this indicates that the calling thread | |
| 437 // has claimed the thread's stack as a root groop in the current | |
| 438 // collection. | |
| 439 bool claim_oops_do(bool is_par, int collection_parity) { | |
| 440 if (!is_par) { | |
| 441 _oops_do_parity = collection_parity; | |
| 442 return true; | |
| 443 } else { | |
| 444 return claim_oops_do_par_case(collection_parity); | |
| 445 } | |
| 446 } | |
| 447 | |
| 448 // Sweeper support | |
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449 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 450 |
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451 // Used by fast lock support |
| 0 | 452 virtual bool is_lock_owned(address adr) const; |
| 453 | |
| 454 // Check if address is in the stack of the thread (not just for locks). | |
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455 // Warning: the method can only be used on the running thread |
| 0 | 456 bool is_in_stack(address adr) const; |
| 457 | |
| 458 // Sets this thread as starting thread. Returns failure if thread | |
| 459 // creation fails due to lack of memory, too many threads etc. | |
| 460 bool set_as_starting_thread(); | |
| 461 | |
| 462 protected: | |
| 463 // OS data associated with the thread | |
| 464 OSThread* _osthread; // Platform-specific thread information | |
| 465 | |
| 466 // Thread local resource area for temporary allocation within the VM | |
| 467 ResourceArea* _resource_area; | |
| 468 | |
| 469 // Thread local handle area for allocation of handles within the VM | |
| 470 HandleArea* _handle_area; | |
| 471 | |
| 472 // Support for stack overflow handling, get_thread, etc. | |
| 473 address _stack_base; | |
| 474 size_t _stack_size; | |
| 475 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
| 476 int _lgrp_id; | |
| 477 | |
| 478 public: | |
| 479 // Stack overflow support | |
| 480 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
| 481 | |
| 482 void set_stack_base(address base) { _stack_base = base; } | |
| 483 size_t stack_size() const { return _stack_size; } | |
| 484 void set_stack_size(size_t size) { _stack_size = size; } | |
| 485 void record_stack_base_and_size(); | |
| 486 | |
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487 bool on_local_stack(address adr) const { |
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488 /* QQQ this has knowledge of direction, ought to be a stack method */ |
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489 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); |
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490 } |
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491 |
| 0 | 492 int lgrp_id() const { return _lgrp_id; } |
| 493 void set_lgrp_id(int value) { _lgrp_id = value; } | |
| 494 | |
| 495 // Printing | |
| 496 void print_on(outputStream* st) const; | |
| 497 void print() const { print_on(tty); } | |
| 498 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 499 | |
| 500 // Debug-only code | |
| 501 | |
| 502 #ifdef ASSERT | |
| 503 private: | |
| 504 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
| 505 Monitor *_owned_locks; | |
| 506 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, | |
| 507 // thus the friendship | |
| 508 friend class Mutex; | |
| 509 friend class Monitor; | |
| 510 | |
| 511 public: | |
| 512 void print_owned_locks_on(outputStream* st) const; | |
| 513 void print_owned_locks() const { print_owned_locks_on(tty); } | |
| 514 Monitor * owned_locks() const { return _owned_locks; } | |
| 515 bool owns_locks() const { return owned_locks() != NULL; } | |
| 516 bool owns_locks_but_compiled_lock() const; | |
| 517 | |
| 518 // Deadlock detection | |
| 519 bool allow_allocation() { return _allow_allocation_count == 0; } | |
| 520 #endif | |
| 521 | |
| 522 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
| 523 | |
| 524 private: | |
| 525 volatile int _jvmti_env_iteration_count; | |
| 526 | |
| 527 public: | |
| 528 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
| 529 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
| 530 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
| 531 | |
| 532 // Code generation | |
| 533 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
| 534 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
| 535 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
| 536 | |
| 537 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
| 538 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
| 539 | |
| 540 #define TLAB_FIELD_OFFSET(name) \ | |
| 541 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } | |
| 542 | |
| 543 TLAB_FIELD_OFFSET(start) | |
| 544 TLAB_FIELD_OFFSET(end) | |
| 545 TLAB_FIELD_OFFSET(top) | |
| 546 TLAB_FIELD_OFFSET(pf_top) | |
| 547 TLAB_FIELD_OFFSET(size) // desired_size | |
| 548 TLAB_FIELD_OFFSET(refill_waste_limit) | |
| 549 TLAB_FIELD_OFFSET(number_of_refills) | |
| 550 TLAB_FIELD_OFFSET(fast_refill_waste) | |
| 551 TLAB_FIELD_OFFSET(slow_allocations) | |
| 552 | |
| 553 #undef TLAB_FIELD_OFFSET | |
| 554 | |
| 555 public: | |
| 556 volatile intptr_t _Stalled ; | |
| 557 volatile int _TypeTag ; | |
| 558 ParkEvent * _ParkEvent ; // for synchronized() | |
| 559 ParkEvent * _SleepEvent ; // for Thread.sleep | |
| 560 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
| 561 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
| 562 int NativeSyncRecursion ; // diagnostic | |
| 563 | |
| 564 volatile int _OnTrap ; // Resume-at IP delta | |
| 565 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
| 566 jint _hashStateX ; // thread-specific hashCode generator state | |
| 567 jint _hashStateY ; | |
| 568 jint _hashStateZ ; | |
| 569 void * _schedctl ; | |
| 570 | |
| 571 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
| 572 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
| 573 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
| 574 | |
| 575 volatile jint rng [4] ; // RNG for spin loop | |
| 576 | |
| 577 // Low-level leaf-lock primitives used to implement synchronization | |
| 578 // and native monitor-mutex infrastructure. | |
| 579 // Not for general synchronization use. | |
| 580 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
| 581 static void SpinRelease (volatile int * Lock) ; | |
| 582 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
| 583 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
| 584 static void muxRelease (volatile intptr_t * Lock) ; | |
| 585 }; | |
| 586 | |
| 587 // Inline implementation of Thread::current() | |
| 588 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
| 589 // startup. | |
| 590 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
| 591 // period. This is inlined in thread_<os_family>.inline.hpp. | |
| 592 | |
| 593 inline Thread* Thread::current() { | |
| 594 #ifdef ASSERT | |
| 595 // This function is very high traffic. Define PARANOID to enable expensive | |
| 596 // asserts. | |
| 597 #ifdef PARANOID | |
| 598 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
| 599 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
| 600 assert(t != NULL && !t->is_inside_signal_handler(), | |
| 601 "Don't use Thread::current() inside signal handler"); | |
| 602 #endif | |
| 603 #endif | |
| 604 Thread* thread = ThreadLocalStorage::thread(); | |
| 605 assert(thread != NULL, "just checking"); | |
| 606 return thread; | |
| 607 } | |
| 608 | |
| 609 // Name support for threads. non-JavaThread subclasses with multiple | |
| 610 // uniquely named instances should derive from this. | |
| 611 class NamedThread: public Thread { | |
| 612 friend class VMStructs; | |
| 613 enum { | |
| 614 max_name_len = 64 | |
| 615 }; | |
| 616 private: | |
| 617 char* _name; | |
|
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618 // log JavaThread being processed by oops_do |
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619 JavaThread* _processed_thread; |
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620 |
| 0 | 621 public: |
| 622 NamedThread(); | |
| 623 ~NamedThread(); | |
| 624 // May only be called once per thread. | |
| 625 void set_name(const char* format, ...); | |
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626 virtual bool is_Named_thread() const { return true; } |
| 0 | 627 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
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628 JavaThread *processed_thread() { return _processed_thread; } |
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629 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } |
| 0 | 630 }; |
| 631 | |
| 632 // Worker threads are named and have an id of an assigned work. | |
| 633 class WorkerThread: public NamedThread { | |
| 634 private: | |
| 635 uint _id; | |
| 636 public: | |
|
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637 WorkerThread() : _id(0) { } |
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638 virtual bool is_Worker_thread() const { return true; } |
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639 |
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640 virtual WorkerThread* as_Worker_thread() const { |
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641 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); |
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642 return (WorkerThread*) this; |
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643 } |
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644 |
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645 void set_id(uint work_id) { _id = work_id; } |
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646 uint id() const { return _id; } |
| 0 | 647 }; |
| 648 | |
| 649 // A single WatcherThread is used for simulating timer interrupts. | |
| 650 class WatcherThread: public Thread { | |
| 651 friend class VMStructs; | |
| 652 public: | |
| 653 virtual void run(); | |
| 654 | |
| 655 private: | |
| 656 static WatcherThread* _watcher_thread; | |
| 657 | |
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658 volatile static bool _should_terminate; // updated without holding lock |
| 0 | 659 public: |
| 660 enum SomeConstants { | |
| 661 delay_interval = 10 // interrupt delay in milliseconds | |
| 662 }; | |
| 663 | |
| 664 // Constructor | |
| 665 WatcherThread(); | |
| 666 | |
| 667 // Tester | |
| 668 bool is_Watcher_thread() const { return true; } | |
| 669 | |
| 670 // Printing | |
| 671 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
| 672 void print_on(outputStream* st) const; | |
| 673 void print() const { print_on(tty); } | |
| 674 | |
| 675 // Returns the single instance of WatcherThread | |
| 676 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
| 677 | |
| 678 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
| 679 static void start(); | |
| 680 static void stop(); | |
| 681 }; | |
| 682 | |
| 683 | |
| 684 class CompilerThread; | |
| 685 | |
| 686 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
| 687 | |
| 688 class JavaThread: public Thread { | |
| 689 friend class VMStructs; | |
| 690 private: | |
| 691 JavaThread* _next; // The next thread in the Threads list | |
| 692 oop _threadObj; // The Java level thread object | |
| 693 | |
| 694 #ifdef ASSERT | |
| 695 private: | |
| 696 int _java_call_counter; | |
| 697 | |
| 698 public: | |
| 699 int java_call_counter() { return _java_call_counter; } | |
| 700 void inc_java_call_counter() { _java_call_counter++; } | |
| 701 void dec_java_call_counter() { | |
| 702 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
| 703 _java_call_counter--; | |
| 704 } | |
| 705 private: // restore original namespace restriction | |
| 706 #endif // ifdef ASSERT | |
| 707 | |
| 708 #ifndef PRODUCT | |
| 709 public: | |
| 710 enum { | |
| 711 jump_ring_buffer_size = 16 | |
| 712 }; | |
| 713 private: // restore original namespace restriction | |
| 714 #endif | |
| 715 | |
| 716 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
| 717 | |
| 718 ThreadFunction _entry_point; | |
| 719 | |
| 720 JNIEnv _jni_environment; | |
| 721 | |
| 722 // Deopt support | |
| 723 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
| 724 | |
| 725 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
| 726 // transition out of native | |
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727 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized |
| 0 | 728 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays |
| 729 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
| 730 // Because deoptimization is lazy we must save jvmti requests to set locals | |
| 731 // in compiled frames until we deoptimize and we have an interpreter frame. | |
| 732 // This holds the pointer to array (yeah like there might be more than one) of | |
| 733 // description of compiled vframes that have locals that need to be updated. | |
| 734 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
| 735 | |
| 736 // Handshake value for fixing 6243940. We need a place for the i2c | |
| 737 // adapter to store the callee methodOop. This value is NEVER live | |
| 738 // across a gc point so it does NOT have to be gc'd | |
| 739 // The handshake is open ended since we can't be certain that it will | |
| 740 // be NULLed. This is because we rarely ever see the race and end up | |
| 741 // in handle_wrong_method which is the backend of the handshake. See | |
| 742 // code in i2c adapters and handle_wrong_method. | |
| 743 | |
| 744 methodOop _callee_target; | |
| 745 | |
| 746 // Oop results of VM runtime calls | |
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747 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved |
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748 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved |
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749 |
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750 // See ReduceInitialCardMarks: this holds the precise space interval of |
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751 // the most recent slow path allocation for which compiled code has |
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752 // elided card-marks for performance along the fast-path. |
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753 MemRegion _deferred_card_mark; |
| 0 | 754 |
| 755 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
| 756 // allocated during deoptimization | |
| 757 // and by JNI_MonitorEnter/Exit | |
| 758 | |
| 759 // Async. requests support | |
| 760 enum AsyncRequests { | |
| 761 _no_async_condition = 0, | |
| 762 _async_exception, | |
| 763 _async_unsafe_access_error | |
| 764 }; | |
| 765 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
| 766 oop _pending_async_exception; | |
| 767 | |
| 768 // Safepoint support | |
| 769 public: // Expose _thread_state for SafeFetchInt() | |
| 770 volatile JavaThreadState _thread_state; | |
| 771 private: | |
| 772 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
| 773 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
| 774 | |
| 775 // JavaThread termination support | |
| 776 enum TerminatedTypes { | |
| 777 _not_terminated = 0xDEAD - 2, | |
| 778 _thread_exiting, // JavaThread::exit() has been called for this thread | |
| 779 _thread_terminated, // JavaThread is removed from thread list | |
| 780 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
| 781 // only VM_Exit can set _vm_exited | |
| 782 }; | |
| 783 | |
| 784 // In general a JavaThread's _terminated field transitions as follows: | |
| 785 // | |
| 786 // _not_terminated => _thread_exiting => _thread_terminated | |
| 787 // | |
| 788 // _vm_exited is a special value to cover the case of a JavaThread | |
| 789 // executing native code after the VM itself is terminated. | |
| 790 TerminatedTypes _terminated; | |
| 791 // suspend/resume support | |
| 792 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
| 793 jint _in_deopt_handler; // count of deoptimization | |
| 794 // handlers thread is in | |
| 795 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
| 796 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
| 797 // never locked) when throwing an exception. Used by interpreter only. | |
| 798 | |
| 799 // Flag to mark a JNI thread in the process of attaching - See CR 6404306 | |
| 800 // This flag is never set true other than at construction, and in that case | |
| 801 // is shortly thereafter set false | |
| 802 volatile bool _is_attaching; | |
| 803 | |
| 804 public: | |
| 805 // State of the stack guard pages for this thread. | |
| 806 enum StackGuardState { | |
| 807 stack_guard_unused, // not needed | |
| 808 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
| 809 stack_guard_enabled // enabled | |
| 810 }; | |
| 811 | |
| 812 private: | |
| 813 | |
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814 // c1x needs some place to put the dimensions |
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815 jint c1x_multinewarray_storage[256]; |
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816 |
| 0 | 817 StackGuardState _stack_guard_state; |
| 818 | |
| 819 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
| 820 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
| 821 // code) | |
| 822 volatile oop _exception_oop; // Exception thrown in compiled code | |
| 823 volatile address _exception_pc; // PC where exception happened | |
| 824 volatile address _exception_handler_pc; // PC for handler of exception | |
| 825 volatile int _exception_stack_size; // Size of frame where exception happened | |
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826 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. |
| 0 | 827 |
| 828 // support for compilation | |
| 829 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) | |
| 830 | |
| 831 // support for JNI critical regions | |
| 832 jint _jni_active_critical; // count of entries into JNI critical region | |
| 833 | |
| 834 // For deadlock detection. | |
| 835 int _depth_first_number; | |
| 836 | |
| 837 // JVMTI PopFrame support | |
| 838 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
| 839 int _popframe_condition; | |
| 840 | |
| 841 #ifndef PRODUCT | |
| 842 int _jmp_ring_index; | |
| 843 struct { | |
| 844 // We use intptr_t instead of address so debugger doesn't try and display strings | |
| 845 intptr_t _target; | |
| 846 intptr_t _instruction; | |
| 847 const char* _file; | |
| 848 int _line; | |
| 849 } _jmp_ring[ jump_ring_buffer_size ]; | |
| 850 #endif /* PRODUCT */ | |
| 851 | |
| 342 | 852 #ifndef SERIALGC |
| 853 // Support for G1 barriers | |
| 854 | |
| 855 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
| 856 // Set of all such queues. | |
| 857 static SATBMarkQueueSet _satb_mark_queue_set; | |
| 858 | |
| 859 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
| 860 // Set of all such queues. | |
| 861 static DirtyCardQueueSet _dirty_card_queue_set; | |
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863 void flush_barrier_queues(); |
| 342 | 864 #endif // !SERIALGC |
| 865 | |
| 0 | 866 friend class VMThread; |
| 867 friend class ThreadWaitTransition; | |
| 868 friend class VM_Exit; | |
| 869 | |
| 870 void initialize(); // Initialized the instance variables | |
| 871 | |
| 872 public: | |
| 873 // Constructor | |
| 874 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads | |
| 875 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); | |
| 876 ~JavaThread(); | |
| 877 | |
| 878 #ifdef ASSERT | |
| 879 // verify this JavaThread hasn't be published in the Threads::list yet | |
| 880 void verify_not_published(); | |
| 881 #endif | |
| 882 | |
| 883 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
| 884 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
| 885 _jni_environment.functions = functionTable; | |
| 886 } | |
| 887 struct JNINativeInterface_* get_jni_functions() { | |
| 888 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
| 889 } | |
| 890 | |
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891 // This function is called at thread creation to allow |
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892 // platform specific thread variables to be initialized. |
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893 void cache_global_variables(); |
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894 |
| 0 | 895 // Executes Shutdown.shutdown() |
| 896 void invoke_shutdown_hooks(); | |
| 897 | |
| 898 // Cleanup on thread exit | |
| 899 enum ExitType { | |
| 900 normal_exit, | |
| 901 jni_detach | |
| 902 }; | |
| 903 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
| 904 | |
| 905 void cleanup_failed_attach_current_thread(); | |
| 906 | |
| 907 // Testers | |
| 908 virtual bool is_Java_thread() const { return true; } | |
| 909 | |
| 910 // compilation | |
| 911 void set_is_compiling(bool f) { _is_compiling = f; } | |
| 912 bool is_compiling() const { return _is_compiling; } | |
| 913 | |
| 914 // Thread chain operations | |
| 915 JavaThread* next() const { return _next; } | |
| 916 void set_next(JavaThread* p) { _next = p; } | |
| 917 | |
| 918 // Thread oop. threadObj() can be NULL for initial JavaThread | |
| 919 // (or for threads attached via JNI) | |
| 920 oop threadObj() const { return _threadObj; } | |
| 921 void set_threadObj(oop p) { _threadObj = p; } | |
| 922 | |
| 923 ThreadPriority java_priority() const; // Read from threadObj() | |
| 924 | |
| 925 // Prepare thread and add to priority queue. If a priority is | |
| 926 // not specified, use the priority of the thread object. Threads_lock | |
| 927 // must be held while this function is called. | |
| 928 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
| 929 | |
| 930 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
| 931 address saved_exception_pc() { return _saved_exception_pc; } | |
| 932 | |
| 933 | |
| 934 ThreadFunction entry_point() const { return _entry_point; } | |
| 935 | |
| 936 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
| 937 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
| 938 | |
| 939 // Last frame anchor routines | |
| 940 | |
| 941 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
| 942 | |
| 943 // last_Java_sp | |
| 944 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
| 945 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
| 946 | |
| 947 // last_Java_pc | |
| 948 | |
| 949 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
| 950 | |
| 951 // Safepoint support | |
| 952 JavaThreadState thread_state() const { return _thread_state; } | |
| 953 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
| 954 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
| 955 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
| 956 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
| 957 | |
| 958 // thread has called JavaThread::exit() or is terminated | |
| 959 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
| 960 // thread is terminated (no longer on the threads list); we compare | |
| 961 // against the two non-terminated values so that a freed JavaThread | |
| 962 // will also be considered terminated. | |
| 963 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
| 964 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
| 965 // special for Threads::remove() which is static: | |
| 966 void set_terminated_value() { _terminated = _thread_terminated; } | |
| 967 void block_if_vm_exited(); | |
| 968 | |
| 969 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
| 970 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
| 971 | |
| 972 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
| 973 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
| 974 | |
| 975 | |
| 976 // Suspend/resume support for JavaThread | |
| 977 | |
| 978 private: | |
| 979 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
| 980 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
| 981 | |
| 982 public: | |
| 983 void java_suspend(); | |
| 984 void java_resume(); | |
| 985 int java_suspend_self(); | |
| 986 | |
| 987 void check_and_wait_while_suspended() { | |
| 988 assert(JavaThread::current() == this, "sanity check"); | |
| 989 | |
| 990 bool do_self_suspend; | |
| 991 do { | |
| 992 // were we externally suspended while we were waiting? | |
| 993 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
| 994 if (do_self_suspend) { | |
| 995 // don't surprise the thread that suspended us by returning | |
| 996 java_suspend_self(); | |
| 997 set_suspend_equivalent(); | |
| 998 } | |
| 999 } while (do_self_suspend); | |
| 1000 } | |
| 1001 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
| 1002 // Check for async exception in addition to safepoint and suspend request. | |
| 1003 static void check_special_condition_for_native_trans(JavaThread *thread); | |
| 1004 | |
| 1005 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
| 1006 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
| 1007 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1008 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 1009 // SR_lock to allow the thread to reach a stable thread state if | |
| 1010 // it is currently in a transient thread state. | |
| 1011 return is_ext_suspend_completed(false /*!called_by_wait */, | |
| 1012 SuspendRetryDelay, bits); | |
| 1013 } | |
| 1014 | |
| 1015 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
| 1016 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
| 1017 // passed as the count and delay parameters. Experiments with specific | |
| 1018 // calls to wait_for_ext_suspend_completion() can be done by passing | |
| 1019 // other values in the code. Experiments with all calls can be done | |
| 1020 // via the appropriate -XX options. | |
| 1021 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
| 1022 | |
| 1023 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
| 1024 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
| 1025 | |
| 1026 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
| 1027 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
| 1028 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
| 1029 | |
| 1030 bool is_external_suspend() const { | |
| 1031 return (_suspend_flags & _external_suspend) != 0; | |
| 1032 } | |
| 1033 // Whenever a thread transitions from native to vm/java it must suspend | |
| 1034 // if external|deopt suspend is present. | |
| 1035 bool is_suspend_after_native() const { | |
| 1036 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
| 1037 } | |
| 1038 | |
| 1039 // external suspend request is completed | |
| 1040 bool is_ext_suspended() const { | |
| 1041 return (_suspend_flags & _ext_suspended) != 0; | |
| 1042 } | |
| 1043 | |
| 1044 bool is_external_suspend_with_lock() const { | |
| 1045 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1046 return is_external_suspend(); | |
| 1047 } | |
| 1048 | |
| 1049 // Special method to handle a pending external suspend request | |
| 1050 // when a suspend equivalent condition lifts. | |
| 1051 bool handle_special_suspend_equivalent_condition() { | |
| 1052 assert(is_suspend_equivalent(), | |
| 1053 "should only be called in a suspend equivalence condition"); | |
| 1054 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1055 bool ret = is_external_suspend(); | |
| 1056 if (!ret) { | |
| 1057 // not about to self-suspend so clear suspend equivalence | |
| 1058 clear_suspend_equivalent(); | |
| 1059 } | |
| 1060 // implied else: | |
| 1061 // We have a pending external suspend request so we leave the | |
| 1062 // suspend_equivalent flag set until java_suspend_self() sets | |
| 1063 // the ext_suspended flag and clears the suspend_equivalent | |
| 1064 // flag. This insures that wait_for_ext_suspend_completion() | |
| 1065 // will return consistent values. | |
| 1066 return ret; | |
| 1067 } | |
| 1068 | |
| 1069 // utility methods to see if we are doing some kind of suspension | |
| 1070 bool is_being_ext_suspended() const { | |
| 1071 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1072 return is_ext_suspended() || is_external_suspend(); | |
| 1073 } | |
| 1074 | |
| 1075 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
| 1076 | |
| 1077 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
| 1078 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
| 1079 | |
| 1080 // Thread.stop support | |
| 1081 void send_thread_stop(oop throwable); | |
| 1082 AsyncRequests clear_special_runtime_exit_condition() { | |
| 1083 AsyncRequests x = _special_runtime_exit_condition; | |
| 1084 _special_runtime_exit_condition = _no_async_condition; | |
| 1085 return x; | |
| 1086 } | |
| 1087 | |
| 1088 // Are any async conditions present? | |
| 1089 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
| 1090 | |
| 1091 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
| 1092 | |
| 1093 // these next two are also used for self-suspension and async exception support | |
| 1094 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
| 1095 | |
| 1096 // Return true if JavaThread has an asynchronous condition or | |
| 1097 // if external suspension is requested. | |
| 1098 bool has_special_runtime_exit_condition() { | |
| 1099 // We call is_external_suspend() last since external suspend should | |
| 1100 // be less common. Because we don't use is_external_suspend_with_lock | |
| 1101 // it is possible that we won't see an asynchronous external suspend | |
| 1102 // request that has just gotten started, i.e., SR_lock grabbed but | |
| 1103 // _external_suspend field change either not made yet or not visible | |
| 1104 // yet. However, this is okay because the request is asynchronous and | |
| 1105 // we will see the new flag value the next time through. It's also | |
| 1106 // possible that the external suspend request is dropped after | |
| 1107 // we have checked is_external_suspend(), we will recheck its value | |
| 1108 // under SR_lock in java_suspend_self(). | |
| 1109 return (_special_runtime_exit_condition != _no_async_condition) || | |
| 1110 is_external_suspend() || is_deopt_suspend(); | |
| 1111 } | |
| 1112 | |
| 1113 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
| 1114 | |
| 1115 void set_pending_async_exception(oop e) { | |
| 1116 _pending_async_exception = e; | |
| 1117 _special_runtime_exit_condition = _async_exception; | |
| 1118 set_has_async_exception(); | |
| 1119 } | |
| 1120 | |
| 1121 // Fast-locking support | |
| 1122 bool is_lock_owned(address adr) const; | |
| 1123 | |
| 1124 // Accessors for vframe array top | |
| 1125 // The linked list of vframe arrays are sorted on sp. This means when we | |
| 1126 // unpack the head must contain the vframe array to unpack. | |
| 1127 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
| 1128 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
| 1129 | |
| 1130 // Side structure for defering update of java frame locals until deopt occurs | |
| 1131 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
| 1132 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
| 1133 | |
| 1134 // These only really exist to make debugging deopt problems simpler | |
| 1135 | |
| 1136 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
| 1137 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
| 1138 | |
| 1139 // The special resourceMark used during deoptimization | |
| 1140 | |
| 1141 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
| 1142 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
| 1143 | |
| 1144 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
| 1145 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
| 1146 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
| 1147 | |
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1148 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } |
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1149 nmethod* deopt_nmethod() { return _deopt_nmethod; } |
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1150 |
| 0 | 1151 methodOop callee_target() const { return _callee_target; } |
| 1152 void set_callee_target (methodOop x) { _callee_target = x; } | |
| 1153 | |
| 1154 // Oop results of vm runtime calls | |
| 1155 oop vm_result() const { return _vm_result; } | |
| 1156 void set_vm_result (oop x) { _vm_result = x; } | |
| 1157 | |
| 1158 oop vm_result_2() const { return _vm_result_2; } | |
| 1159 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
| 1160 | |
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1161 MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
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1162 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
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1163 |
| 0 | 1164 // Exception handling for compiled methods |
| 1165 oop exception_oop() const { return _exception_oop; } | |
| 1166 int exception_stack_size() const { return _exception_stack_size; } | |
| 1167 address exception_pc() const { return _exception_pc; } | |
| 1168 address exception_handler_pc() const { return _exception_handler_pc; } | |
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1169 bool is_method_handle_return() const { return _is_method_handle_return == 1; } |
| 0 | 1170 |
| 1171 void set_exception_oop(oop o) { _exception_oop = o; } | |
| 1172 void set_exception_pc(address a) { _exception_pc = a; } | |
| 1173 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
| 1174 void set_exception_stack_size(int size) { _exception_stack_size = size; } | |
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1175 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } |
| 0 | 1176 |
| 1177 // Stack overflow support | |
| 1178 inline size_t stack_available(address cur_sp); | |
| 1179 address stack_yellow_zone_base() | |
| 1180 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
| 1181 size_t stack_yellow_zone_size() | |
| 1182 { return StackYellowPages * os::vm_page_size(); } | |
| 1183 address stack_red_zone_base() | |
| 1184 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
| 1185 size_t stack_red_zone_size() | |
| 1186 { return StackRedPages * os::vm_page_size(); } | |
| 1187 bool in_stack_yellow_zone(address a) | |
| 1188 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
| 1189 bool in_stack_red_zone(address a) | |
| 1190 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
| 1191 | |
| 1192 void create_stack_guard_pages(); | |
| 1193 void remove_stack_guard_pages(); | |
| 1194 | |
| 1195 void enable_stack_yellow_zone(); | |
| 1196 void disable_stack_yellow_zone(); | |
| 1197 void enable_stack_red_zone(); | |
| 1198 void disable_stack_red_zone(); | |
| 1199 | |
| 1200 inline bool stack_yellow_zone_disabled(); | |
| 1201 inline bool stack_yellow_zone_enabled(); | |
| 1202 | |
| 1203 // Attempt to reguard the stack after a stack overflow may have occurred. | |
| 1204 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
| 1205 // pages are already guarded, or (c) the pages were successfully reguarded. | |
| 1206 // Returns false if there is not enough stack space to reguard the pages, in | |
| 1207 // which case the caller should unwind a frame and try again. The argument | |
| 1208 // should be the caller's (approximate) sp. | |
| 1209 bool reguard_stack(address cur_sp); | |
| 1210 // Similar to above but see if current stackpoint is out of the guard area | |
| 1211 // and reguard if possible. | |
| 1212 bool reguard_stack(void); | |
| 1213 | |
| 1214 // Misc. accessors/mutators | |
| 1215 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
| 1216 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
| 1217 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
| 1218 | |
| 1219 #ifndef PRODUCT | |
| 1220 void record_jump(address target, address instr, const char* file, int line); | |
| 1221 #endif /* PRODUCT */ | |
| 1222 | |
| 1223 // For assembly stub generation | |
| 1224 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
| 1225 #ifndef PRODUCT | |
| 1226 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
| 1227 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
| 1228 #endif /* PRODUCT */ | |
| 1229 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
| 1230 static ByteSize last_Java_sp_offset() { | |
| 1231 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
| 1232 } | |
| 1233 static ByteSize last_Java_pc_offset() { | |
| 1234 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
| 1235 } | |
| 1236 static ByteSize frame_anchor_offset() { | |
| 1237 return byte_offset_of(JavaThread, _anchor); | |
| 1238 } | |
| 1239 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
| 1240 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
| 1241 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
| 1242 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
| 1243 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
| 1244 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
| 1245 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
| 1246 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
| 1247 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
| 1248 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); } | |
|
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1249 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } |
| 0 | 1250 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
| 1251 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
|
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1252 static ByteSize c1x_multinewarray_storage_offset() { return byte_offset_of(JavaThread, c1x_multinewarray_storage); } |
| 0 | 1253 |
| 1254 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
|
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1255 static ByteSize should_post_on_exceptions_flag_offset() { |
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1256 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); |
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1257 } |
| 0 | 1258 |
| 342 | 1259 #ifndef SERIALGC |
| 1260 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
| 1261 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
| 1262 #endif // !SERIALGC | |
| 1263 | |
| 0 | 1264 // Returns the jni environment for this thread |
| 1265 JNIEnv* jni_environment() { return &_jni_environment; } | |
| 1266 | |
| 1267 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
| 1268 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
| 1269 // Only return NULL if thread is off the thread list; starting to | |
| 1270 // exit should not return NULL. | |
| 1271 if (thread_from_jni_env->is_terminated()) { | |
| 1272 thread_from_jni_env->block_if_vm_exited(); | |
| 1273 return NULL; | |
| 1274 } else { | |
| 1275 return thread_from_jni_env; | |
| 1276 } | |
| 1277 } | |
| 1278 | |
| 1279 // JNI critical regions. These can nest. | |
| 1280 bool in_critical() { return _jni_active_critical > 0; } | |
| 1281 void enter_critical() { assert(Thread::current() == this, | |
| 1282 "this must be current thread"); | |
| 1283 _jni_active_critical++; } | |
| 1284 void exit_critical() { assert(Thread::current() == this, | |
| 1285 "this must be current thread"); | |
| 1286 _jni_active_critical--; | |
| 1287 assert(_jni_active_critical >= 0, | |
| 1288 "JNI critical nesting problem?"); } | |
| 1289 | |
| 1290 // For deadlock detection | |
| 1291 int depth_first_number() { return _depth_first_number; } | |
| 1292 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
| 1293 | |
| 1294 private: | |
| 1295 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
| 1296 | |
| 1297 public: | |
| 1298 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
| 1299 void add_monitor_chunk(MonitorChunk* chunk); | |
| 1300 void remove_monitor_chunk(MonitorChunk* chunk); | |
| 1301 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
| 1302 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
| 1303 void dec_in_deopt_handler() { | |
| 1304 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
| 1305 if (_in_deopt_handler > 0) { // robustness | |
| 1306 _in_deopt_handler--; | |
| 1307 } | |
| 1308 } | |
| 1309 | |
| 1310 private: | |
| 1311 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
| 1312 | |
| 1313 public: | |
| 1314 | |
| 1315 // Frame iteration; calls the function f for all frames on the stack | |
| 1316 void frames_do(void f(frame*, const RegisterMap*)); | |
| 1317 | |
| 1318 // Memory operations | |
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1319 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1320 |
| 1321 // Sweeper operations | |
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1322 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1323 |
| 1324 // Memory management operations | |
| 1325 void gc_epilogue(); | |
| 1326 void gc_prologue(); | |
| 1327 | |
| 1328 // Misc. operations | |
| 1329 char* name() const { return (char*)get_thread_name(); } | |
| 1330 void print_on(outputStream* st) const; | |
| 1331 void print() const { print_on(tty); } | |
| 1332 void print_value(); | |
| 1333 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
| 1334 void print_thread_state() const PRODUCT_RETURN; | |
| 1335 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 1336 void verify(); | |
| 1337 const char* get_thread_name() const; | |
| 1338 private: | |
| 1339 // factor out low-level mechanics for use in both normal and error cases | |
| 1340 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
| 1341 public: | |
| 1342 const char* get_threadgroup_name() const; | |
| 1343 const char* get_parent_name() const; | |
| 1344 | |
| 1345 // Accessing frames | |
| 1346 frame last_frame() { | |
| 1347 _anchor.make_walkable(this); | |
| 1348 return pd_last_frame(); | |
| 1349 } | |
| 1350 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
| 1351 | |
| 1352 // Returns method at 'depth' java or native frames down the stack | |
| 1353 // Used for security checks | |
| 1354 klassOop security_get_caller_class(int depth); | |
| 1355 | |
| 1356 // Print stack trace in external format | |
| 1357 void print_stack_on(outputStream* st); | |
| 1358 void print_stack() { print_stack_on(tty); } | |
| 1359 | |
| 1360 // Print stack traces in various internal formats | |
| 1361 void trace_stack() PRODUCT_RETURN; | |
| 1362 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
| 1363 void trace_frames() PRODUCT_RETURN; | |
| 1364 | |
| 1365 // Returns the number of stack frames on the stack | |
| 1366 int depth() const; | |
| 1367 | |
| 1368 // Function for testing deoptimization | |
| 1369 void deoptimize(); | |
| 1370 void make_zombies(); | |
| 1371 | |
| 1372 void deoptimized_wrt_marked_nmethods(); | |
| 1373 | |
| 1374 // Profiling operation (see fprofile.cpp) | |
| 1375 public: | |
| 1376 bool profile_last_Java_frame(frame* fr); | |
| 1377 | |
| 1378 private: | |
| 1379 ThreadProfiler* _thread_profiler; | |
| 1380 private: | |
| 1381 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
| 1382 friend class FlatProfilerTask; // uses get_thread_profiler. | |
| 1383 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
| 1384 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
| 1385 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
| 1386 ThreadProfiler* result = _thread_profiler; | |
| 1387 _thread_profiler = tp; | |
| 1388 return result; | |
| 1389 } | |
| 1390 | |
| 1391 // Static operations | |
| 1392 public: | |
| 1393 // Returns the running thread as a JavaThread | |
| 1394 static inline JavaThread* current(); | |
| 1395 | |
| 1396 // Returns the active Java thread. Do not use this if you know you are calling | |
| 1397 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
| 1398 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
| 1399 // operation. You may not want that either. | |
| 1400 static JavaThread* active(); | |
| 1401 | |
| 1402 inline CompilerThread* as_CompilerThread(); | |
| 1403 | |
| 1404 public: | |
| 1405 virtual void run(); | |
| 1406 void thread_main_inner(); | |
| 1407 | |
| 1408 private: | |
| 1409 // PRIVILEGED STACK | |
| 1410 PrivilegedElement* _privileged_stack_top; | |
| 1411 GrowableArray<oop>* _array_for_gc; | |
| 1412 public: | |
| 1413 | |
| 1414 // Returns the privileged_stack information. | |
| 1415 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
| 1416 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
| 1417 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
| 1418 | |
| 1419 public: | |
| 1420 // Thread local information maintained by JVMTI. | |
| 1421 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
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1422 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1423 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1424 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1425 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1426 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1427 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1428 // the specified JavaThread is exiting. |
| 0 | 1429 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
| 1430 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
| 1431 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
| 1432 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
| 1433 | |
| 1434 // JVMTI PopFrame support | |
| 1435 // Setting and clearing popframe_condition | |
| 1436 // All of these enumerated values are bits. popframe_pending | |
| 1437 // indicates that a PopFrame() has been requested and not yet been | |
| 1438 // completed. popframe_processing indicates that that PopFrame() is in | |
| 1439 // the process of being completed. popframe_force_deopt_reexecution_bit | |
| 1440 // indicates that special handling is required when returning to a | |
| 1441 // deoptimized caller. | |
| 1442 enum PopCondition { | |
| 1443 popframe_inactive = 0x00, | |
| 1444 popframe_pending_bit = 0x01, | |
| 1445 popframe_processing_bit = 0x02, | |
| 1446 popframe_force_deopt_reexecution_bit = 0x04 | |
| 1447 }; | |
| 1448 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
| 1449 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
| 1450 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
| 1451 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
| 1452 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
| 1453 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
| 1454 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
| 1455 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
| 1456 #ifdef CC_INTERP | |
| 1457 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
| 1458 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
| 1459 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
| 1460 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
| 1461 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
| 1462 #endif | |
| 1463 | |
| 1464 private: | |
| 1465 // Saved incoming arguments to popped frame. | |
| 1466 // Used only when popped interpreted frame returns to deoptimized frame. | |
| 1467 void* _popframe_preserved_args; | |
| 1468 int _popframe_preserved_args_size; | |
| 1469 | |
| 1470 public: | |
| 1471 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
| 1472 void* popframe_preserved_args(); | |
| 1473 ByteSize popframe_preserved_args_size(); | |
| 1474 WordSize popframe_preserved_args_size_in_words(); | |
| 1475 void popframe_free_preserved_args(); | |
| 1476 | |
| 1477 | |
| 1478 private: | |
| 1479 JvmtiThreadState *_jvmti_thread_state; | |
| 1480 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
| 1481 | |
| 1482 // Used by the interpreter in fullspeed mode for frame pop, method | |
| 1483 // entry, method exit and single stepping support. This field is | |
| 1484 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
| 1485 // It can be set to zero asynchronously (i.e., without a VM operation | |
| 1486 // or a lock) so we have to be very careful. | |
| 1487 int _interp_only_mode; | |
| 1488 | |
| 1489 public: | |
| 1490 // used by the interpreter for fullspeed debugging support (see above) | |
| 1491 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
| 1492 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
| 1493 int get_interp_only_mode() { return _interp_only_mode; } | |
| 1494 void increment_interp_only_mode() { ++_interp_only_mode; } | |
| 1495 void decrement_interp_only_mode() { --_interp_only_mode; } | |
| 1496 | |
|
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1497 // support for cached flag that indicates whether exceptions need to be posted for this thread |
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1498 // if this is false, we can avoid deoptimizing when events are thrown |
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1499 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
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1500 private: |
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1501 int _should_post_on_exceptions_flag; |
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1502 |
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1503 public: |
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1504 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
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1505 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
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1506 |
| 0 | 1507 private: |
| 1508 ThreadStatistics *_thread_stat; | |
| 1509 | |
| 1510 public: | |
| 1511 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
| 1512 | |
| 1513 // Return a blocker object for which this thread is blocked parking. | |
| 1514 oop current_park_blocker(); | |
| 1515 | |
| 1516 private: | |
| 1517 static size_t _stack_size_at_create; | |
| 1518 | |
| 1519 public: | |
| 1520 static inline size_t stack_size_at_create(void) { | |
| 1521 return _stack_size_at_create; | |
| 1522 } | |
| 1523 static inline void set_stack_size_at_create(size_t value) { | |
| 1524 _stack_size_at_create = value; | |
| 1525 } | |
| 1526 | |
| 342 | 1527 #ifndef SERIALGC |
| 1528 // SATB marking queue support | |
| 1529 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
| 1530 static SATBMarkQueueSet& satb_mark_queue_set() { | |
| 1531 return _satb_mark_queue_set; | |
| 1532 } | |
| 1533 | |
| 1534 // Dirty card queue support | |
| 1535 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
| 1536 static DirtyCardQueueSet& dirty_card_queue_set() { | |
| 1537 return _dirty_card_queue_set; | |
| 1538 } | |
| 1539 #endif // !SERIALGC | |
| 1540 | |
|
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1541 // This method initializes the SATB and dirty card queues before a |
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1542 // JavaThread is added to the Java thread list. Right now, we don't |
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1543 // have to do anything to the dirty card queue (it should have been |
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1544 // activated when the thread was created), but we have to activate |
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1545 // the SATB queue if the thread is created while a marking cycle is |
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1546 // in progress. The activation / de-activation of the SATB queues at |
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1547 // the beginning / end of a marking cycle is done during safepoints |
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1548 // so we have to make sure this method is called outside one to be |
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1549 // able to safely read the active field of the SATB queue set. Right |
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1550 // now, it is called just before the thread is added to the Java |
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1551 // thread list in the Threads::add() method. That method is holding |
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1552 // the Threads_lock which ensures we are outside a safepoint. We |
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1553 // cannot do the obvious and set the active field of the SATB queue |
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1554 // when the thread is created given that, in some cases, safepoints |
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1555 // might happen between the JavaThread constructor being called and the |
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1556 // thread being added to the Java thread list (an example of this is |
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1557 // when the structure for the DestroyJavaVM thread is created). |
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1558 #ifndef SERIALGC |
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1559 void initialize_queues(); |
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1560 #else // !SERIALGC |
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1561 void initialize_queues() { } |
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1562 #endif // !SERIALGC |
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1563 |
| 0 | 1564 // Machine dependent stuff |
| 1972 | 1565 #ifdef TARGET_OS_ARCH_linux_x86 |
| 1566 # include "thread_linux_x86.hpp" | |
| 1567 #endif | |
| 1568 #ifdef TARGET_OS_ARCH_linux_sparc | |
| 1569 # include "thread_linux_sparc.hpp" | |
| 1570 #endif | |
| 1571 #ifdef TARGET_OS_ARCH_linux_zero | |
| 1572 # include "thread_linux_zero.hpp" | |
| 1573 #endif | |
| 1574 #ifdef TARGET_OS_ARCH_solaris_x86 | |
| 1575 # include "thread_solaris_x86.hpp" | |
| 1576 #endif | |
| 1577 #ifdef TARGET_OS_ARCH_solaris_sparc | |
| 1578 # include "thread_solaris_sparc.hpp" | |
| 1579 #endif | |
| 1580 #ifdef TARGET_OS_ARCH_windows_x86 | |
| 1581 # include "thread_windows_x86.hpp" | |
| 1582 #endif | |
| 1583 | |
| 0 | 1584 |
| 1585 public: | |
| 1586 void set_blocked_on_compilation(bool value) { | |
| 1587 _blocked_on_compilation = value; | |
| 1588 } | |
| 1589 | |
| 1590 bool blocked_on_compilation() { | |
| 1591 return _blocked_on_compilation; | |
| 1592 } | |
| 1593 protected: | |
| 1594 bool _blocked_on_compilation; | |
| 1595 | |
| 1596 | |
| 1597 // JSR166 per-thread parker | |
| 1598 private: | |
| 1599 Parker* _parker; | |
| 1600 public: | |
| 1601 Parker* parker() { return _parker; } | |
| 1602 | |
| 1603 // Biased locking support | |
| 1604 private: | |
| 1605 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
| 1606 public: | |
| 1607 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
| 1608 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
| 1609 | |
| 1610 // clearing/querying jni attach status | |
| 1611 bool is_attaching() const { return _is_attaching; } | |
| 1612 void set_attached() { _is_attaching = false; OrderAccess::fence(); } | |
| 342 | 1613 private: |
| 1614 // This field is used to determine if a thread has claimed | |
| 1615 // a par_id: it is -1 if the thread has not claimed a par_id; | |
| 1616 // otherwise its value is the par_id that has been claimed. | |
| 1617 int _claimed_par_id; | |
| 1618 public: | |
| 1619 int get_claimed_par_id() { return _claimed_par_id; } | |
| 1620 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
| 0 | 1621 }; |
| 1622 | |
| 1623 // Inline implementation of JavaThread::current | |
| 1624 inline JavaThread* JavaThread::current() { | |
| 1625 Thread* thread = ThreadLocalStorage::thread(); | |
| 1626 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
| 1627 return (JavaThread*)thread; | |
| 1628 } | |
| 1629 | |
| 1630 inline CompilerThread* JavaThread::as_CompilerThread() { | |
| 1631 assert(is_Compiler_thread(), "just checking"); | |
| 1632 return (CompilerThread*)this; | |
| 1633 } | |
| 1634 | |
| 1635 inline bool JavaThread::stack_yellow_zone_disabled() { | |
| 1636 return _stack_guard_state == stack_guard_yellow_disabled; | |
| 1637 } | |
| 1638 | |
| 1639 inline bool JavaThread::stack_yellow_zone_enabled() { | |
| 1640 #ifdef ASSERT | |
| 1641 if (os::uses_stack_guard_pages()) { | |
| 1642 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
| 1643 } | |
| 1644 #endif | |
| 1645 return _stack_guard_state == stack_guard_enabled; | |
| 1646 } | |
| 1647 | |
| 1648 inline size_t JavaThread::stack_available(address cur_sp) { | |
| 1649 // This code assumes java stacks grow down | |
| 1650 address low_addr; // Limit on the address for deepest stack depth | |
| 1651 if ( _stack_guard_state == stack_guard_unused) { | |
| 1652 low_addr = stack_base() - stack_size(); | |
| 1653 } else { | |
| 1654 low_addr = stack_yellow_zone_base(); | |
| 1655 } | |
| 1656 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
| 1657 } | |
| 1658 | |
| 1659 // A JavaThread for low memory detection support | |
| 1660 class LowMemoryDetectorThread : public JavaThread { | |
| 1661 friend class VMStructs; | |
| 1662 public: | |
| 1663 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; | |
| 1664 | |
| 1665 // Hide this thread from external view. | |
| 1666 bool is_hidden_from_external_view() const { return true; } | |
| 1667 }; | |
| 1668 | |
| 1669 // A thread used for Compilation. | |
| 1670 class CompilerThread : public JavaThread { | |
| 1671 friend class VMStructs; | |
| 1672 private: | |
| 1673 CompilerCounters* _counters; | |
| 1674 | |
| 1675 ciEnv* _env; | |
| 1676 CompileLog* _log; | |
| 1677 CompileTask* _task; | |
| 1678 CompileQueue* _queue; | |
|
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1679 bool _is_compiling; |
| 1584 | 1680 BufferBlob* _buffer_blob; |
| 0 | 1681 |
| 1682 public: | |
| 1683 | |
| 1684 static CompilerThread* current(); | |
| 1685 | |
| 1686 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
| 1687 | |
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1688 bool is_compiling() const { return _is_compiling; } |
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1689 void set_compiling(bool b) { _is_compiling = b; } |
| 0 | 1690 bool is_Compiler_thread() const { return true; } |
| 1691 // Hide this compiler thread from external view. | |
| 1692 bool is_hidden_from_external_view() const { return true; } | |
| 1693 | |
| 1694 CompileQueue* queue() { return _queue; } | |
| 1695 CompilerCounters* counters() { return _counters; } | |
| 1696 | |
| 1697 // Get/set the thread's compilation environment. | |
| 1698 ciEnv* env() { return _env; } | |
| 1699 void set_env(ciEnv* env) { _env = env; } | |
| 1700 | |
| 1584 | 1701 BufferBlob* get_buffer_blob() { return _buffer_blob; } |
| 1702 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; | |
| 1703 | |
| 0 | 1704 // Get/set the thread's logging information |
| 1705 CompileLog* log() { return _log; } | |
| 1706 void init_log(CompileLog* log) { | |
| 1707 // Set once, for good. | |
| 1708 assert(_log == NULL, "set only once"); | |
| 1709 _log = log; | |
| 1710 } | |
| 1711 | |
| 1712 #ifndef PRODUCT | |
| 1713 private: | |
| 1714 IdealGraphPrinter *_ideal_graph_printer; | |
| 1715 public: | |
| 1716 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
| 1717 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
| 1718 #endif | |
| 1719 | |
| 1720 // Get/set the thread's current task | |
| 1721 CompileTask* task() { return _task; } | |
| 1722 void set_task(CompileTask* task) { _task = task; } | |
| 1723 }; | |
| 1724 | |
| 1725 inline CompilerThread* CompilerThread::current() { | |
| 1726 return JavaThread::current()->as_CompilerThread(); | |
| 1727 } | |
| 1728 | |
| 1729 | |
| 1730 // The active thread queue. It also keeps track of the current used | |
| 1731 // thread priorities. | |
| 1732 class Threads: AllStatic { | |
| 1733 friend class VMStructs; | |
| 1734 private: | |
| 1735 static JavaThread* _thread_list; | |
| 1736 static int _number_of_threads; | |
| 1737 static int _number_of_non_daemon_threads; | |
| 1738 static int _return_code; | |
| 1739 | |
| 1740 public: | |
| 1741 // Thread management | |
| 1742 // force_daemon is a concession to JNI, where we may need to add a | |
| 1743 // thread to the thread list before allocating its thread object | |
| 1744 static void add(JavaThread* p, bool force_daemon = false); | |
| 1745 static void remove(JavaThread* p); | |
| 1746 static bool includes(JavaThread* p); | |
| 1747 static JavaThread* first() { return _thread_list; } | |
| 1748 static void threads_do(ThreadClosure* tc); | |
| 1749 | |
| 1750 // Initializes the vm and creates the vm thread | |
| 1751 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
| 1752 static void convert_vm_init_libraries_to_agents(); | |
| 1753 static void create_vm_init_libraries(); | |
| 1754 static void create_vm_init_agents(); | |
| 1755 static void shutdown_vm_agents(); | |
| 1756 static bool destroy_vm(); | |
| 1757 // Supported VM versions via JNI | |
| 1758 // Includes JNI_VERSION_1_1 | |
| 1759 static jboolean is_supported_jni_version_including_1_1(jint version); | |
| 1760 // Does not include JNI_VERSION_1_1 | |
| 1761 static jboolean is_supported_jni_version(jint version); | |
| 1762 | |
| 1763 // Garbage collection | |
| 1764 static void follow_other_roots(void f(oop*)); | |
| 1765 | |
| 1766 // Apply "f->do_oop" to all root oops in all threads. | |
| 1767 // This version may only be called by sequential code. | |
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1768 static void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1769 // This version may be called by sequential or parallel code. |
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1770 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1771 // This creates a list of GCTasks, one per thread. |
| 1772 static void create_thread_roots_tasks(GCTaskQueue* q); | |
| 1773 // This creates a list of GCTasks, one per thread, for marking objects. | |
| 1774 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
| 1775 | |
| 1776 // Apply "f->do_oop" to roots in all threads that | |
| 1777 // are part of compiled frames | |
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1778 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1779 |
| 1780 static void convert_hcode_pointers(); | |
| 1781 static void restore_hcode_pointers(); | |
| 1782 | |
| 1783 // Sweeper | |
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1784 static void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1785 |
| 1786 static void gc_epilogue(); | |
| 1787 static void gc_prologue(); | |
| 1788 | |
| 1789 // Verification | |
| 1790 static void verify(); | |
| 1791 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
| 1792 static void print(bool print_stacks, bool internal_format) { | |
| 1793 // this function is only used by debug.cpp | |
| 1794 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
| 1795 } | |
| 1796 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
| 1797 | |
| 1798 // Get Java threads that are waiting to enter a monitor. If doLock | |
| 1799 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1800 // VM needs to be at a safepoint. | |
| 1801 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
| 1802 address monitor, bool doLock); | |
| 1803 | |
| 1804 // Get owning Java thread from the monitor's owner field. If doLock | |
| 1805 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1806 // VM needs to be at a safepoint. | |
| 1807 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
| 1808 bool doLock); | |
| 1809 | |
| 1810 // Number of threads on the active threads list | |
| 1811 static int number_of_threads() { return _number_of_threads; } | |
| 1812 // Number of non-daemon threads on the active threads list | |
| 1813 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
| 1814 | |
| 1815 // Deoptimizes all frames tied to marked nmethods | |
| 1816 static void deoptimized_wrt_marked_nmethods(); | |
| 1817 | |
| 1818 }; | |
| 1819 | |
| 1820 | |
| 1821 // Thread iterator | |
| 1822 class ThreadClosure: public StackObj { | |
| 1823 public: | |
| 1824 virtual void do_thread(Thread* thread) = 0; | |
| 1825 }; | |
| 1826 | |
| 1827 class SignalHandlerMark: public StackObj { | |
| 1828 private: | |
| 1829 Thread* _thread; | |
| 1830 public: | |
| 1831 SignalHandlerMark(Thread* t) { | |
| 1832 _thread = t; | |
| 1833 if (_thread) _thread->enter_signal_handler(); | |
| 1834 } | |
| 1835 ~SignalHandlerMark() { | |
| 1836 if (_thread) _thread->leave_signal_handler(); | |
| 1837 _thread = NULL; | |
| 1838 } | |
| 1839 }; | |
| 1840 | |
| 1972 | 1841 |
| 1842 #endif // SHARE_VM_RUNTIME_THREAD_HPP |