Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/thread.hpp @ 1974:fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
Summary: Enable reference discovery during concurrent marking by setting the reference processor field of the concurrent marking closure. Keep reference objects on the discovered reference lists alive during incremental evacuation pauses until they are processed at the end of concurrent marking.
Reviewed-by: ysr, tonyp
| author | johnc |
|---|---|
| date | Wed, 01 Dec 2010 17:34:02 -0800 |
| parents | f95d63e2154a |
| children | 06f017f7daa7 b1a2afa37ec4 |
| 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 | |
| 814 StackGuardState _stack_guard_state; | |
| 815 | |
| 816 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
| 817 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
| 818 // code) | |
| 819 volatile oop _exception_oop; // Exception thrown in compiled code | |
| 820 volatile address _exception_pc; // PC where exception happened | |
| 821 volatile address _exception_handler_pc; // PC for handler of exception | |
| 822 volatile int _exception_stack_size; // Size of frame where exception happened | |
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823 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. |
| 0 | 824 |
| 825 // support for compilation | |
| 826 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) | |
| 827 | |
| 828 // support for JNI critical regions | |
| 829 jint _jni_active_critical; // count of entries into JNI critical region | |
| 830 | |
| 831 // For deadlock detection. | |
| 832 int _depth_first_number; | |
| 833 | |
| 834 // JVMTI PopFrame support | |
| 835 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
| 836 int _popframe_condition; | |
| 837 | |
| 838 #ifndef PRODUCT | |
| 839 int _jmp_ring_index; | |
| 840 struct { | |
| 841 // We use intptr_t instead of address so debugger doesn't try and display strings | |
| 842 intptr_t _target; | |
| 843 intptr_t _instruction; | |
| 844 const char* _file; | |
| 845 int _line; | |
| 846 } _jmp_ring[ jump_ring_buffer_size ]; | |
| 847 #endif /* PRODUCT */ | |
| 848 | |
| 342 | 849 #ifndef SERIALGC |
| 850 // Support for G1 barriers | |
| 851 | |
| 852 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
| 853 // Set of all such queues. | |
| 854 static SATBMarkQueueSet _satb_mark_queue_set; | |
| 855 | |
| 856 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
| 857 // Set of all such queues. | |
| 858 static DirtyCardQueueSet _dirty_card_queue_set; | |
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859 |
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860 void flush_barrier_queues(); |
| 342 | 861 #endif // !SERIALGC |
| 862 | |
| 0 | 863 friend class VMThread; |
| 864 friend class ThreadWaitTransition; | |
| 865 friend class VM_Exit; | |
| 866 | |
| 867 void initialize(); // Initialized the instance variables | |
| 868 | |
| 869 public: | |
| 870 // Constructor | |
| 871 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads | |
| 872 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); | |
| 873 ~JavaThread(); | |
| 874 | |
| 875 #ifdef ASSERT | |
| 876 // verify this JavaThread hasn't be published in the Threads::list yet | |
| 877 void verify_not_published(); | |
| 878 #endif | |
| 879 | |
| 880 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
| 881 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
| 882 _jni_environment.functions = functionTable; | |
| 883 } | |
| 884 struct JNINativeInterface_* get_jni_functions() { | |
| 885 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
| 886 } | |
| 887 | |
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888 // This function is called at thread creation to allow |
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889 // platform specific thread variables to be initialized. |
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890 void cache_global_variables(); |
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891 |
| 0 | 892 // Executes Shutdown.shutdown() |
| 893 void invoke_shutdown_hooks(); | |
| 894 | |
| 895 // Cleanup on thread exit | |
| 896 enum ExitType { | |
| 897 normal_exit, | |
| 898 jni_detach | |
| 899 }; | |
| 900 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
| 901 | |
| 902 void cleanup_failed_attach_current_thread(); | |
| 903 | |
| 904 // Testers | |
| 905 virtual bool is_Java_thread() const { return true; } | |
| 906 | |
| 907 // compilation | |
| 908 void set_is_compiling(bool f) { _is_compiling = f; } | |
| 909 bool is_compiling() const { return _is_compiling; } | |
| 910 | |
| 911 // Thread chain operations | |
| 912 JavaThread* next() const { return _next; } | |
| 913 void set_next(JavaThread* p) { _next = p; } | |
| 914 | |
| 915 // Thread oop. threadObj() can be NULL for initial JavaThread | |
| 916 // (or for threads attached via JNI) | |
| 917 oop threadObj() const { return _threadObj; } | |
| 918 void set_threadObj(oop p) { _threadObj = p; } | |
| 919 | |
| 920 ThreadPriority java_priority() const; // Read from threadObj() | |
| 921 | |
| 922 // Prepare thread and add to priority queue. If a priority is | |
| 923 // not specified, use the priority of the thread object. Threads_lock | |
| 924 // must be held while this function is called. | |
| 925 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
| 926 | |
| 927 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
| 928 address saved_exception_pc() { return _saved_exception_pc; } | |
| 929 | |
| 930 | |
| 931 ThreadFunction entry_point() const { return _entry_point; } | |
| 932 | |
| 933 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
| 934 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
| 935 | |
| 936 // Last frame anchor routines | |
| 937 | |
| 938 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
| 939 | |
| 940 // last_Java_sp | |
| 941 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
| 942 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
| 943 | |
| 944 // last_Java_pc | |
| 945 | |
| 946 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
| 947 | |
| 948 // Safepoint support | |
| 949 JavaThreadState thread_state() const { return _thread_state; } | |
| 950 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
| 951 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
| 952 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
| 953 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
| 954 | |
| 955 // thread has called JavaThread::exit() or is terminated | |
| 956 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
| 957 // thread is terminated (no longer on the threads list); we compare | |
| 958 // against the two non-terminated values so that a freed JavaThread | |
| 959 // will also be considered terminated. | |
| 960 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
| 961 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
| 962 // special for Threads::remove() which is static: | |
| 963 void set_terminated_value() { _terminated = _thread_terminated; } | |
| 964 void block_if_vm_exited(); | |
| 965 | |
| 966 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
| 967 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
| 968 | |
| 969 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
| 970 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
| 971 | |
| 972 | |
| 973 // Suspend/resume support for JavaThread | |
| 974 | |
| 975 private: | |
| 976 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
| 977 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
| 978 | |
| 979 public: | |
| 980 void java_suspend(); | |
| 981 void java_resume(); | |
| 982 int java_suspend_self(); | |
| 983 | |
| 984 void check_and_wait_while_suspended() { | |
| 985 assert(JavaThread::current() == this, "sanity check"); | |
| 986 | |
| 987 bool do_self_suspend; | |
| 988 do { | |
| 989 // were we externally suspended while we were waiting? | |
| 990 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
| 991 if (do_self_suspend) { | |
| 992 // don't surprise the thread that suspended us by returning | |
| 993 java_suspend_self(); | |
| 994 set_suspend_equivalent(); | |
| 995 } | |
| 996 } while (do_self_suspend); | |
| 997 } | |
| 998 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
| 999 // Check for async exception in addition to safepoint and suspend request. | |
| 1000 static void check_special_condition_for_native_trans(JavaThread *thread); | |
| 1001 | |
| 1002 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
| 1003 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
| 1004 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1005 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 1006 // SR_lock to allow the thread to reach a stable thread state if | |
| 1007 // it is currently in a transient thread state. | |
| 1008 return is_ext_suspend_completed(false /*!called_by_wait */, | |
| 1009 SuspendRetryDelay, bits); | |
| 1010 } | |
| 1011 | |
| 1012 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
| 1013 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
| 1014 // passed as the count and delay parameters. Experiments with specific | |
| 1015 // calls to wait_for_ext_suspend_completion() can be done by passing | |
| 1016 // other values in the code. Experiments with all calls can be done | |
| 1017 // via the appropriate -XX options. | |
| 1018 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
| 1019 | |
| 1020 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
| 1021 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
| 1022 | |
| 1023 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
| 1024 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
| 1025 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
| 1026 | |
| 1027 bool is_external_suspend() const { | |
| 1028 return (_suspend_flags & _external_suspend) != 0; | |
| 1029 } | |
| 1030 // Whenever a thread transitions from native to vm/java it must suspend | |
| 1031 // if external|deopt suspend is present. | |
| 1032 bool is_suspend_after_native() const { | |
| 1033 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
| 1034 } | |
| 1035 | |
| 1036 // external suspend request is completed | |
| 1037 bool is_ext_suspended() const { | |
| 1038 return (_suspend_flags & _ext_suspended) != 0; | |
| 1039 } | |
| 1040 | |
| 1041 bool is_external_suspend_with_lock() const { | |
| 1042 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1043 return is_external_suspend(); | |
| 1044 } | |
| 1045 | |
| 1046 // Special method to handle a pending external suspend request | |
| 1047 // when a suspend equivalent condition lifts. | |
| 1048 bool handle_special_suspend_equivalent_condition() { | |
| 1049 assert(is_suspend_equivalent(), | |
| 1050 "should only be called in a suspend equivalence condition"); | |
| 1051 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1052 bool ret = is_external_suspend(); | |
| 1053 if (!ret) { | |
| 1054 // not about to self-suspend so clear suspend equivalence | |
| 1055 clear_suspend_equivalent(); | |
| 1056 } | |
| 1057 // implied else: | |
| 1058 // We have a pending external suspend request so we leave the | |
| 1059 // suspend_equivalent flag set until java_suspend_self() sets | |
| 1060 // the ext_suspended flag and clears the suspend_equivalent | |
| 1061 // flag. This insures that wait_for_ext_suspend_completion() | |
| 1062 // will return consistent values. | |
| 1063 return ret; | |
| 1064 } | |
| 1065 | |
| 1066 // utility methods to see if we are doing some kind of suspension | |
| 1067 bool is_being_ext_suspended() const { | |
| 1068 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1069 return is_ext_suspended() || is_external_suspend(); | |
| 1070 } | |
| 1071 | |
| 1072 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
| 1073 | |
| 1074 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
| 1075 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
| 1076 | |
| 1077 // Thread.stop support | |
| 1078 void send_thread_stop(oop throwable); | |
| 1079 AsyncRequests clear_special_runtime_exit_condition() { | |
| 1080 AsyncRequests x = _special_runtime_exit_condition; | |
| 1081 _special_runtime_exit_condition = _no_async_condition; | |
| 1082 return x; | |
| 1083 } | |
| 1084 | |
| 1085 // Are any async conditions present? | |
| 1086 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
| 1087 | |
| 1088 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
| 1089 | |
| 1090 // these next two are also used for self-suspension and async exception support | |
| 1091 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
| 1092 | |
| 1093 // Return true if JavaThread has an asynchronous condition or | |
| 1094 // if external suspension is requested. | |
| 1095 bool has_special_runtime_exit_condition() { | |
| 1096 // We call is_external_suspend() last since external suspend should | |
| 1097 // be less common. Because we don't use is_external_suspend_with_lock | |
| 1098 // it is possible that we won't see an asynchronous external suspend | |
| 1099 // request that has just gotten started, i.e., SR_lock grabbed but | |
| 1100 // _external_suspend field change either not made yet or not visible | |
| 1101 // yet. However, this is okay because the request is asynchronous and | |
| 1102 // we will see the new flag value the next time through. It's also | |
| 1103 // possible that the external suspend request is dropped after | |
| 1104 // we have checked is_external_suspend(), we will recheck its value | |
| 1105 // under SR_lock in java_suspend_self(). | |
| 1106 return (_special_runtime_exit_condition != _no_async_condition) || | |
| 1107 is_external_suspend() || is_deopt_suspend(); | |
| 1108 } | |
| 1109 | |
| 1110 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
| 1111 | |
| 1112 void set_pending_async_exception(oop e) { | |
| 1113 _pending_async_exception = e; | |
| 1114 _special_runtime_exit_condition = _async_exception; | |
| 1115 set_has_async_exception(); | |
| 1116 } | |
| 1117 | |
| 1118 // Fast-locking support | |
| 1119 bool is_lock_owned(address adr) const; | |
| 1120 | |
| 1121 // Accessors for vframe array top | |
| 1122 // The linked list of vframe arrays are sorted on sp. This means when we | |
| 1123 // unpack the head must contain the vframe array to unpack. | |
| 1124 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
| 1125 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
| 1126 | |
| 1127 // Side structure for defering update of java frame locals until deopt occurs | |
| 1128 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
| 1129 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
| 1130 | |
| 1131 // These only really exist to make debugging deopt problems simpler | |
| 1132 | |
| 1133 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
| 1134 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
| 1135 | |
| 1136 // The special resourceMark used during deoptimization | |
| 1137 | |
| 1138 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
| 1139 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
| 1140 | |
| 1141 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
| 1142 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
| 1143 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
| 1144 | |
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1145 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } |
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1146 nmethod* deopt_nmethod() { return _deopt_nmethod; } |
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1147 |
| 0 | 1148 methodOop callee_target() const { return _callee_target; } |
| 1149 void set_callee_target (methodOop x) { _callee_target = x; } | |
| 1150 | |
| 1151 // Oop results of vm runtime calls | |
| 1152 oop vm_result() const { return _vm_result; } | |
| 1153 void set_vm_result (oop x) { _vm_result = x; } | |
| 1154 | |
| 1155 oop vm_result_2() const { return _vm_result_2; } | |
| 1156 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
| 1157 | |
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1158 MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
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1159 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
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1160 |
| 0 | 1161 // Exception handling for compiled methods |
| 1162 oop exception_oop() const { return _exception_oop; } | |
| 1163 int exception_stack_size() const { return _exception_stack_size; } | |
| 1164 address exception_pc() const { return _exception_pc; } | |
| 1165 address exception_handler_pc() const { return _exception_handler_pc; } | |
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1166 bool is_method_handle_return() const { return _is_method_handle_return == 1; } |
| 0 | 1167 |
| 1168 void set_exception_oop(oop o) { _exception_oop = o; } | |
| 1169 void set_exception_pc(address a) { _exception_pc = a; } | |
| 1170 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
| 1171 void set_exception_stack_size(int size) { _exception_stack_size = size; } | |
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1172 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } |
| 0 | 1173 |
| 1174 // Stack overflow support | |
| 1175 inline size_t stack_available(address cur_sp); | |
| 1176 address stack_yellow_zone_base() | |
| 1177 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
| 1178 size_t stack_yellow_zone_size() | |
| 1179 { return StackYellowPages * os::vm_page_size(); } | |
| 1180 address stack_red_zone_base() | |
| 1181 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
| 1182 size_t stack_red_zone_size() | |
| 1183 { return StackRedPages * os::vm_page_size(); } | |
| 1184 bool in_stack_yellow_zone(address a) | |
| 1185 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
| 1186 bool in_stack_red_zone(address a) | |
| 1187 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
| 1188 | |
| 1189 void create_stack_guard_pages(); | |
| 1190 void remove_stack_guard_pages(); | |
| 1191 | |
| 1192 void enable_stack_yellow_zone(); | |
| 1193 void disable_stack_yellow_zone(); | |
| 1194 void enable_stack_red_zone(); | |
| 1195 void disable_stack_red_zone(); | |
| 1196 | |
| 1197 inline bool stack_yellow_zone_disabled(); | |
| 1198 inline bool stack_yellow_zone_enabled(); | |
| 1199 | |
| 1200 // Attempt to reguard the stack after a stack overflow may have occurred. | |
| 1201 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
| 1202 // pages are already guarded, or (c) the pages were successfully reguarded. | |
| 1203 // Returns false if there is not enough stack space to reguard the pages, in | |
| 1204 // which case the caller should unwind a frame and try again. The argument | |
| 1205 // should be the caller's (approximate) sp. | |
| 1206 bool reguard_stack(address cur_sp); | |
| 1207 // Similar to above but see if current stackpoint is out of the guard area | |
| 1208 // and reguard if possible. | |
| 1209 bool reguard_stack(void); | |
| 1210 | |
| 1211 // Misc. accessors/mutators | |
| 1212 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
| 1213 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
| 1214 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
| 1215 | |
| 1216 #ifndef PRODUCT | |
| 1217 void record_jump(address target, address instr, const char* file, int line); | |
| 1218 #endif /* PRODUCT */ | |
| 1219 | |
| 1220 // For assembly stub generation | |
| 1221 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
| 1222 #ifndef PRODUCT | |
| 1223 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
| 1224 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
| 1225 #endif /* PRODUCT */ | |
| 1226 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
| 1227 static ByteSize last_Java_sp_offset() { | |
| 1228 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
| 1229 } | |
| 1230 static ByteSize last_Java_pc_offset() { | |
| 1231 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
| 1232 } | |
| 1233 static ByteSize frame_anchor_offset() { | |
| 1234 return byte_offset_of(JavaThread, _anchor); | |
| 1235 } | |
| 1236 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
| 1237 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
| 1238 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
| 1239 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
| 1240 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
| 1241 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
| 1242 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
| 1243 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
| 1244 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
| 1245 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); } | |
|
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1246 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } |
| 0 | 1247 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
| 1248 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
| 1249 | |
| 1250 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
|
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1251 static ByteSize should_post_on_exceptions_flag_offset() { |
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1252 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); |
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1253 } |
| 0 | 1254 |
| 342 | 1255 #ifndef SERIALGC |
| 1256 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
| 1257 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
| 1258 #endif // !SERIALGC | |
| 1259 | |
| 0 | 1260 // Returns the jni environment for this thread |
| 1261 JNIEnv* jni_environment() { return &_jni_environment; } | |
| 1262 | |
| 1263 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
| 1264 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
| 1265 // Only return NULL if thread is off the thread list; starting to | |
| 1266 // exit should not return NULL. | |
| 1267 if (thread_from_jni_env->is_terminated()) { | |
| 1268 thread_from_jni_env->block_if_vm_exited(); | |
| 1269 return NULL; | |
| 1270 } else { | |
| 1271 return thread_from_jni_env; | |
| 1272 } | |
| 1273 } | |
| 1274 | |
| 1275 // JNI critical regions. These can nest. | |
| 1276 bool in_critical() { return _jni_active_critical > 0; } | |
| 1277 void enter_critical() { assert(Thread::current() == this, | |
| 1278 "this must be current thread"); | |
| 1279 _jni_active_critical++; } | |
| 1280 void exit_critical() { assert(Thread::current() == this, | |
| 1281 "this must be current thread"); | |
| 1282 _jni_active_critical--; | |
| 1283 assert(_jni_active_critical >= 0, | |
| 1284 "JNI critical nesting problem?"); } | |
| 1285 | |
| 1286 // For deadlock detection | |
| 1287 int depth_first_number() { return _depth_first_number; } | |
| 1288 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
| 1289 | |
| 1290 private: | |
| 1291 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
| 1292 | |
| 1293 public: | |
| 1294 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
| 1295 void add_monitor_chunk(MonitorChunk* chunk); | |
| 1296 void remove_monitor_chunk(MonitorChunk* chunk); | |
| 1297 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
| 1298 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
| 1299 void dec_in_deopt_handler() { | |
| 1300 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
| 1301 if (_in_deopt_handler > 0) { // robustness | |
| 1302 _in_deopt_handler--; | |
| 1303 } | |
| 1304 } | |
| 1305 | |
| 1306 private: | |
| 1307 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
| 1308 | |
| 1309 public: | |
| 1310 | |
| 1311 // Frame iteration; calls the function f for all frames on the stack | |
| 1312 void frames_do(void f(frame*, const RegisterMap*)); | |
| 1313 | |
| 1314 // Memory operations | |
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1315 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1316 |
| 1317 // Sweeper operations | |
|
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1318 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1319 |
| 1320 // Memory management operations | |
| 1321 void gc_epilogue(); | |
| 1322 void gc_prologue(); | |
| 1323 | |
| 1324 // Misc. operations | |
| 1325 char* name() const { return (char*)get_thread_name(); } | |
| 1326 void print_on(outputStream* st) const; | |
| 1327 void print() const { print_on(tty); } | |
| 1328 void print_value(); | |
| 1329 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
| 1330 void print_thread_state() const PRODUCT_RETURN; | |
| 1331 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 1332 void verify(); | |
| 1333 const char* get_thread_name() const; | |
| 1334 private: | |
| 1335 // factor out low-level mechanics for use in both normal and error cases | |
| 1336 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
| 1337 public: | |
| 1338 const char* get_threadgroup_name() const; | |
| 1339 const char* get_parent_name() const; | |
| 1340 | |
| 1341 // Accessing frames | |
| 1342 frame last_frame() { | |
| 1343 _anchor.make_walkable(this); | |
| 1344 return pd_last_frame(); | |
| 1345 } | |
| 1346 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
| 1347 | |
| 1348 // Returns method at 'depth' java or native frames down the stack | |
| 1349 // Used for security checks | |
| 1350 klassOop security_get_caller_class(int depth); | |
| 1351 | |
| 1352 // Print stack trace in external format | |
| 1353 void print_stack_on(outputStream* st); | |
| 1354 void print_stack() { print_stack_on(tty); } | |
| 1355 | |
| 1356 // Print stack traces in various internal formats | |
| 1357 void trace_stack() PRODUCT_RETURN; | |
| 1358 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
| 1359 void trace_frames() PRODUCT_RETURN; | |
| 1360 | |
| 1361 // Returns the number of stack frames on the stack | |
| 1362 int depth() const; | |
| 1363 | |
| 1364 // Function for testing deoptimization | |
| 1365 void deoptimize(); | |
| 1366 void make_zombies(); | |
| 1367 | |
| 1368 void deoptimized_wrt_marked_nmethods(); | |
| 1369 | |
| 1370 // Profiling operation (see fprofile.cpp) | |
| 1371 public: | |
| 1372 bool profile_last_Java_frame(frame* fr); | |
| 1373 | |
| 1374 private: | |
| 1375 ThreadProfiler* _thread_profiler; | |
| 1376 private: | |
| 1377 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
| 1378 friend class FlatProfilerTask; // uses get_thread_profiler. | |
| 1379 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
| 1380 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
| 1381 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
| 1382 ThreadProfiler* result = _thread_profiler; | |
| 1383 _thread_profiler = tp; | |
| 1384 return result; | |
| 1385 } | |
| 1386 | |
| 1387 // Static operations | |
| 1388 public: | |
| 1389 // Returns the running thread as a JavaThread | |
| 1390 static inline JavaThread* current(); | |
| 1391 | |
| 1392 // Returns the active Java thread. Do not use this if you know you are calling | |
| 1393 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
| 1394 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
| 1395 // operation. You may not want that either. | |
| 1396 static JavaThread* active(); | |
| 1397 | |
| 1398 inline CompilerThread* as_CompilerThread(); | |
| 1399 | |
| 1400 public: | |
| 1401 virtual void run(); | |
| 1402 void thread_main_inner(); | |
| 1403 | |
| 1404 private: | |
| 1405 // PRIVILEGED STACK | |
| 1406 PrivilegedElement* _privileged_stack_top; | |
| 1407 GrowableArray<oop>* _array_for_gc; | |
| 1408 public: | |
| 1409 | |
| 1410 // Returns the privileged_stack information. | |
| 1411 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
| 1412 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
| 1413 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
| 1414 | |
| 1415 public: | |
| 1416 // Thread local information maintained by JVMTI. | |
| 1417 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
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1418 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1419 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1420 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1421 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1422 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1423 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1424 // the specified JavaThread is exiting. |
| 0 | 1425 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
| 1426 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
| 1427 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
| 1428 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
| 1429 | |
| 1430 // JVMTI PopFrame support | |
| 1431 // Setting and clearing popframe_condition | |
| 1432 // All of these enumerated values are bits. popframe_pending | |
| 1433 // indicates that a PopFrame() has been requested and not yet been | |
| 1434 // completed. popframe_processing indicates that that PopFrame() is in | |
| 1435 // the process of being completed. popframe_force_deopt_reexecution_bit | |
| 1436 // indicates that special handling is required when returning to a | |
| 1437 // deoptimized caller. | |
| 1438 enum PopCondition { | |
| 1439 popframe_inactive = 0x00, | |
| 1440 popframe_pending_bit = 0x01, | |
| 1441 popframe_processing_bit = 0x02, | |
| 1442 popframe_force_deopt_reexecution_bit = 0x04 | |
| 1443 }; | |
| 1444 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
| 1445 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
| 1446 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
| 1447 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
| 1448 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
| 1449 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
| 1450 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
| 1451 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
| 1452 #ifdef CC_INTERP | |
| 1453 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
| 1454 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
| 1455 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
| 1456 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
| 1457 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
| 1458 #endif | |
| 1459 | |
| 1460 private: | |
| 1461 // Saved incoming arguments to popped frame. | |
| 1462 // Used only when popped interpreted frame returns to deoptimized frame. | |
| 1463 void* _popframe_preserved_args; | |
| 1464 int _popframe_preserved_args_size; | |
| 1465 | |
| 1466 public: | |
| 1467 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
| 1468 void* popframe_preserved_args(); | |
| 1469 ByteSize popframe_preserved_args_size(); | |
| 1470 WordSize popframe_preserved_args_size_in_words(); | |
| 1471 void popframe_free_preserved_args(); | |
| 1472 | |
| 1473 | |
| 1474 private: | |
| 1475 JvmtiThreadState *_jvmti_thread_state; | |
| 1476 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
| 1477 | |
| 1478 // Used by the interpreter in fullspeed mode for frame pop, method | |
| 1479 // entry, method exit and single stepping support. This field is | |
| 1480 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
| 1481 // It can be set to zero asynchronously (i.e., without a VM operation | |
| 1482 // or a lock) so we have to be very careful. | |
| 1483 int _interp_only_mode; | |
| 1484 | |
| 1485 public: | |
| 1486 // used by the interpreter for fullspeed debugging support (see above) | |
| 1487 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
| 1488 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
| 1489 int get_interp_only_mode() { return _interp_only_mode; } | |
| 1490 void increment_interp_only_mode() { ++_interp_only_mode; } | |
| 1491 void decrement_interp_only_mode() { --_interp_only_mode; } | |
| 1492 | |
|
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1493 // support for cached flag that indicates whether exceptions need to be posted for this thread |
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1494 // if this is false, we can avoid deoptimizing when events are thrown |
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1495 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
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1496 private: |
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1497 int _should_post_on_exceptions_flag; |
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1498 |
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1499 public: |
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1500 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
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1501 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
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1502 |
| 0 | 1503 private: |
| 1504 ThreadStatistics *_thread_stat; | |
| 1505 | |
| 1506 public: | |
| 1507 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
| 1508 | |
| 1509 // Return a blocker object for which this thread is blocked parking. | |
| 1510 oop current_park_blocker(); | |
| 1511 | |
| 1512 private: | |
| 1513 static size_t _stack_size_at_create; | |
| 1514 | |
| 1515 public: | |
| 1516 static inline size_t stack_size_at_create(void) { | |
| 1517 return _stack_size_at_create; | |
| 1518 } | |
| 1519 static inline void set_stack_size_at_create(size_t value) { | |
| 1520 _stack_size_at_create = value; | |
| 1521 } | |
| 1522 | |
| 342 | 1523 #ifndef SERIALGC |
| 1524 // SATB marking queue support | |
| 1525 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
| 1526 static SATBMarkQueueSet& satb_mark_queue_set() { | |
| 1527 return _satb_mark_queue_set; | |
| 1528 } | |
| 1529 | |
| 1530 // Dirty card queue support | |
| 1531 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
| 1532 static DirtyCardQueueSet& dirty_card_queue_set() { | |
| 1533 return _dirty_card_queue_set; | |
| 1534 } | |
| 1535 #endif // !SERIALGC | |
| 1536 | |
|
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1537 // This method initializes the SATB and dirty card queues before a |
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1538 // JavaThread is added to the Java thread list. Right now, we don't |
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1539 // have to do anything to the dirty card queue (it should have been |
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1540 // activated when the thread was created), but we have to activate |
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1541 // the SATB queue if the thread is created while a marking cycle is |
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1542 // in progress. The activation / de-activation of the SATB queues at |
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1543 // the beginning / end of a marking cycle is done during safepoints |
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1544 // so we have to make sure this method is called outside one to be |
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1545 // able to safely read the active field of the SATB queue set. Right |
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1546 // now, it is called just before the thread is added to the Java |
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1547 // thread list in the Threads::add() method. That method is holding |
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1548 // the Threads_lock which ensures we are outside a safepoint. We |
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1549 // cannot do the obvious and set the active field of the SATB queue |
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1550 // when the thread is created given that, in some cases, safepoints |
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1551 // might happen between the JavaThread constructor being called and the |
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1552 // thread being added to the Java thread list (an example of this is |
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1553 // when the structure for the DestroyJavaVM thread is created). |
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1554 #ifndef SERIALGC |
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1555 void initialize_queues(); |
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1556 #else // !SERIALGC |
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1557 void initialize_queues() { } |
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1558 #endif // !SERIALGC |
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1559 |
| 0 | 1560 // Machine dependent stuff |
| 1972 | 1561 #ifdef TARGET_OS_ARCH_linux_x86 |
| 1562 # include "thread_linux_x86.hpp" | |
| 1563 #endif | |
| 1564 #ifdef TARGET_OS_ARCH_linux_sparc | |
| 1565 # include "thread_linux_sparc.hpp" | |
| 1566 #endif | |
| 1567 #ifdef TARGET_OS_ARCH_linux_zero | |
| 1568 # include "thread_linux_zero.hpp" | |
| 1569 #endif | |
| 1570 #ifdef TARGET_OS_ARCH_solaris_x86 | |
| 1571 # include "thread_solaris_x86.hpp" | |
| 1572 #endif | |
| 1573 #ifdef TARGET_OS_ARCH_solaris_sparc | |
| 1574 # include "thread_solaris_sparc.hpp" | |
| 1575 #endif | |
| 1576 #ifdef TARGET_OS_ARCH_windows_x86 | |
| 1577 # include "thread_windows_x86.hpp" | |
| 1578 #endif | |
| 1579 | |
| 0 | 1580 |
| 1581 public: | |
| 1582 void set_blocked_on_compilation(bool value) { | |
| 1583 _blocked_on_compilation = value; | |
| 1584 } | |
| 1585 | |
| 1586 bool blocked_on_compilation() { | |
| 1587 return _blocked_on_compilation; | |
| 1588 } | |
| 1589 protected: | |
| 1590 bool _blocked_on_compilation; | |
| 1591 | |
| 1592 | |
| 1593 // JSR166 per-thread parker | |
| 1594 private: | |
| 1595 Parker* _parker; | |
| 1596 public: | |
| 1597 Parker* parker() { return _parker; } | |
| 1598 | |
| 1599 // Biased locking support | |
| 1600 private: | |
| 1601 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
| 1602 public: | |
| 1603 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
| 1604 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
| 1605 | |
| 1606 // clearing/querying jni attach status | |
| 1607 bool is_attaching() const { return _is_attaching; } | |
| 1608 void set_attached() { _is_attaching = false; OrderAccess::fence(); } | |
| 342 | 1609 private: |
| 1610 // This field is used to determine if a thread has claimed | |
| 1611 // a par_id: it is -1 if the thread has not claimed a par_id; | |
| 1612 // otherwise its value is the par_id that has been claimed. | |
| 1613 int _claimed_par_id; | |
| 1614 public: | |
| 1615 int get_claimed_par_id() { return _claimed_par_id; } | |
| 1616 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
| 0 | 1617 }; |
| 1618 | |
| 1619 // Inline implementation of JavaThread::current | |
| 1620 inline JavaThread* JavaThread::current() { | |
| 1621 Thread* thread = ThreadLocalStorage::thread(); | |
| 1622 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
| 1623 return (JavaThread*)thread; | |
| 1624 } | |
| 1625 | |
| 1626 inline CompilerThread* JavaThread::as_CompilerThread() { | |
| 1627 assert(is_Compiler_thread(), "just checking"); | |
| 1628 return (CompilerThread*)this; | |
| 1629 } | |
| 1630 | |
| 1631 inline bool JavaThread::stack_yellow_zone_disabled() { | |
| 1632 return _stack_guard_state == stack_guard_yellow_disabled; | |
| 1633 } | |
| 1634 | |
| 1635 inline bool JavaThread::stack_yellow_zone_enabled() { | |
| 1636 #ifdef ASSERT | |
| 1637 if (os::uses_stack_guard_pages()) { | |
| 1638 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
| 1639 } | |
| 1640 #endif | |
| 1641 return _stack_guard_state == stack_guard_enabled; | |
| 1642 } | |
| 1643 | |
| 1644 inline size_t JavaThread::stack_available(address cur_sp) { | |
| 1645 // This code assumes java stacks grow down | |
| 1646 address low_addr; // Limit on the address for deepest stack depth | |
| 1647 if ( _stack_guard_state == stack_guard_unused) { | |
| 1648 low_addr = stack_base() - stack_size(); | |
| 1649 } else { | |
| 1650 low_addr = stack_yellow_zone_base(); | |
| 1651 } | |
| 1652 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
| 1653 } | |
| 1654 | |
| 1655 // A JavaThread for low memory detection support | |
| 1656 class LowMemoryDetectorThread : public JavaThread { | |
| 1657 friend class VMStructs; | |
| 1658 public: | |
| 1659 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; | |
| 1660 | |
| 1661 // Hide this thread from external view. | |
| 1662 bool is_hidden_from_external_view() const { return true; } | |
| 1663 }; | |
| 1664 | |
| 1665 // A thread used for Compilation. | |
| 1666 class CompilerThread : public JavaThread { | |
| 1667 friend class VMStructs; | |
| 1668 private: | |
| 1669 CompilerCounters* _counters; | |
| 1670 | |
| 1671 ciEnv* _env; | |
| 1672 CompileLog* _log; | |
| 1673 CompileTask* _task; | |
| 1674 CompileQueue* _queue; | |
| 1584 | 1675 BufferBlob* _buffer_blob; |
| 0 | 1676 |
| 1677 public: | |
| 1678 | |
| 1679 static CompilerThread* current(); | |
| 1680 | |
| 1681 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
| 1682 | |
| 1683 bool is_Compiler_thread() const { return true; } | |
| 1684 // Hide this compiler thread from external view. | |
| 1685 bool is_hidden_from_external_view() const { return true; } | |
| 1686 | |
| 1687 CompileQueue* queue() { return _queue; } | |
| 1688 CompilerCounters* counters() { return _counters; } | |
| 1689 | |
| 1690 // Get/set the thread's compilation environment. | |
| 1691 ciEnv* env() { return _env; } | |
| 1692 void set_env(ciEnv* env) { _env = env; } | |
| 1693 | |
| 1584 | 1694 BufferBlob* get_buffer_blob() { return _buffer_blob; } |
| 1695 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; | |
| 1696 | |
| 0 | 1697 // Get/set the thread's logging information |
| 1698 CompileLog* log() { return _log; } | |
| 1699 void init_log(CompileLog* log) { | |
| 1700 // Set once, for good. | |
| 1701 assert(_log == NULL, "set only once"); | |
| 1702 _log = log; | |
| 1703 } | |
| 1704 | |
| 1705 #ifndef PRODUCT | |
| 1706 private: | |
| 1707 IdealGraphPrinter *_ideal_graph_printer; | |
| 1708 public: | |
| 1709 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
| 1710 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
| 1711 #endif | |
| 1712 | |
| 1713 // Get/set the thread's current task | |
| 1714 CompileTask* task() { return _task; } | |
| 1715 void set_task(CompileTask* task) { _task = task; } | |
| 1716 }; | |
| 1717 | |
| 1718 inline CompilerThread* CompilerThread::current() { | |
| 1719 return JavaThread::current()->as_CompilerThread(); | |
| 1720 } | |
| 1721 | |
| 1722 | |
| 1723 // The active thread queue. It also keeps track of the current used | |
| 1724 // thread priorities. | |
| 1725 class Threads: AllStatic { | |
| 1726 friend class VMStructs; | |
| 1727 private: | |
| 1728 static JavaThread* _thread_list; | |
| 1729 static int _number_of_threads; | |
| 1730 static int _number_of_non_daemon_threads; | |
| 1731 static int _return_code; | |
| 1732 | |
| 1733 public: | |
| 1734 // Thread management | |
| 1735 // force_daemon is a concession to JNI, where we may need to add a | |
| 1736 // thread to the thread list before allocating its thread object | |
| 1737 static void add(JavaThread* p, bool force_daemon = false); | |
| 1738 static void remove(JavaThread* p); | |
| 1739 static bool includes(JavaThread* p); | |
| 1740 static JavaThread* first() { return _thread_list; } | |
| 1741 static void threads_do(ThreadClosure* tc); | |
| 1742 | |
| 1743 // Initializes the vm and creates the vm thread | |
| 1744 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
| 1745 static void convert_vm_init_libraries_to_agents(); | |
| 1746 static void create_vm_init_libraries(); | |
| 1747 static void create_vm_init_agents(); | |
| 1748 static void shutdown_vm_agents(); | |
| 1749 static bool destroy_vm(); | |
| 1750 // Supported VM versions via JNI | |
| 1751 // Includes JNI_VERSION_1_1 | |
| 1752 static jboolean is_supported_jni_version_including_1_1(jint version); | |
| 1753 // Does not include JNI_VERSION_1_1 | |
| 1754 static jboolean is_supported_jni_version(jint version); | |
| 1755 | |
| 1756 // Garbage collection | |
| 1757 static void follow_other_roots(void f(oop*)); | |
| 1758 | |
| 1759 // Apply "f->do_oop" to all root oops in all threads. | |
| 1760 // This version may only be called by sequential code. | |
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1761 static void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1762 // This version may be called by sequential or parallel code. |
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1763 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1764 // This creates a list of GCTasks, one per thread. |
| 1765 static void create_thread_roots_tasks(GCTaskQueue* q); | |
| 1766 // This creates a list of GCTasks, one per thread, for marking objects. | |
| 1767 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
| 1768 | |
| 1769 // Apply "f->do_oop" to roots in all threads that | |
| 1770 // are part of compiled frames | |
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1771 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1772 |
| 1773 static void convert_hcode_pointers(); | |
| 1774 static void restore_hcode_pointers(); | |
| 1775 | |
| 1776 // Sweeper | |
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1777 static void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1778 |
| 1779 static void gc_epilogue(); | |
| 1780 static void gc_prologue(); | |
| 1781 | |
| 1782 // Verification | |
| 1783 static void verify(); | |
| 1784 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
| 1785 static void print(bool print_stacks, bool internal_format) { | |
| 1786 // this function is only used by debug.cpp | |
| 1787 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
| 1788 } | |
| 1789 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
| 1790 | |
| 1791 // Get Java threads that are waiting to enter a monitor. If doLock | |
| 1792 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1793 // VM needs to be at a safepoint. | |
| 1794 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
| 1795 address monitor, bool doLock); | |
| 1796 | |
| 1797 // Get owning Java thread from the monitor's owner field. If doLock | |
| 1798 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1799 // VM needs to be at a safepoint. | |
| 1800 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
| 1801 bool doLock); | |
| 1802 | |
| 1803 // Number of threads on the active threads list | |
| 1804 static int number_of_threads() { return _number_of_threads; } | |
| 1805 // Number of non-daemon threads on the active threads list | |
| 1806 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
| 1807 | |
| 1808 // Deoptimizes all frames tied to marked nmethods | |
| 1809 static void deoptimized_wrt_marked_nmethods(); | |
| 1810 | |
| 1811 }; | |
| 1812 | |
| 1813 | |
| 1814 // Thread iterator | |
| 1815 class ThreadClosure: public StackObj { | |
| 1816 public: | |
| 1817 virtual void do_thread(Thread* thread) = 0; | |
| 1818 }; | |
| 1819 | |
| 1820 class SignalHandlerMark: public StackObj { | |
| 1821 private: | |
| 1822 Thread* _thread; | |
| 1823 public: | |
| 1824 SignalHandlerMark(Thread* t) { | |
| 1825 _thread = t; | |
| 1826 if (_thread) _thread->enter_signal_handler(); | |
| 1827 } | |
| 1828 ~SignalHandlerMark() { | |
| 1829 if (_thread) _thread->leave_signal_handler(); | |
| 1830 _thread = NULL; | |
| 1831 } | |
| 1832 }; | |
| 1833 | |
| 1972 | 1834 |
| 1835 #endif // SHARE_VM_RUNTIME_THREAD_HPP |