Sat, 28 Mar 2009 15:47:29 -0700
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
Summary: When using compressed oops, rather than chaining the overflowed grey objects' pre-images through their klass words, we use GC-worker thread-local overflow stacks.
Reviewed-by: jcoomes, jmasa
duke@435 | 1 | /* |
xdono@905 | 2 | * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | class ThreadSafepointState; |
duke@435 | 26 | class ThreadProfiler; |
duke@435 | 27 | |
duke@435 | 28 | class JvmtiThreadState; |
duke@435 | 29 | class JvmtiGetLoadedClassesClosure; |
duke@435 | 30 | class ThreadStatistics; |
duke@435 | 31 | class ConcurrentLocksDump; |
duke@435 | 32 | class ParkEvent ; |
duke@435 | 33 | |
duke@435 | 34 | class ciEnv; |
duke@435 | 35 | class CompileThread; |
duke@435 | 36 | class CompileLog; |
duke@435 | 37 | class CompileTask; |
duke@435 | 38 | class CompileQueue; |
duke@435 | 39 | class CompilerCounters; |
duke@435 | 40 | class vframeArray; |
duke@435 | 41 | |
duke@435 | 42 | class DeoptResourceMark; |
duke@435 | 43 | class jvmtiDeferredLocalVariableSet; |
duke@435 | 44 | |
duke@435 | 45 | class GCTaskQueue; |
duke@435 | 46 | class ThreadClosure; |
duke@435 | 47 | class IdealGraphPrinter; |
duke@435 | 48 | |
duke@435 | 49 | // Class hierarchy |
duke@435 | 50 | // - Thread |
duke@435 | 51 | // - VMThread |
duke@435 | 52 | // - JavaThread |
duke@435 | 53 | // - WatcherThread |
duke@435 | 54 | |
duke@435 | 55 | class Thread: public ThreadShadow { |
duke@435 | 56 | friend class VMStructs; |
duke@435 | 57 | private: |
duke@435 | 58 | // Exception handling |
duke@435 | 59 | // (Note: _pending_exception and friends are in ThreadShadow) |
duke@435 | 60 | //oop _pending_exception; // pending exception for current thread |
duke@435 | 61 | // const char* _exception_file; // file information for exception (debugging only) |
duke@435 | 62 | // int _exception_line; // line information for exception (debugging only) |
duke@435 | 63 | |
duke@435 | 64 | // Support for forcing alignment of thread objects for biased locking |
duke@435 | 65 | void* _real_malloc_address; |
duke@435 | 66 | public: |
duke@435 | 67 | void* operator new(size_t size); |
duke@435 | 68 | void operator delete(void* p); |
duke@435 | 69 | private: |
duke@435 | 70 | |
duke@435 | 71 | // *************************************************************** |
duke@435 | 72 | // Suspend and resume support |
duke@435 | 73 | // *************************************************************** |
duke@435 | 74 | // |
duke@435 | 75 | // VM suspend/resume no longer exists - it was once used for various |
duke@435 | 76 | // things including safepoints but was deprecated and finally removed |
duke@435 | 77 | // in Java 7. Because VM suspension was considered "internal" Java-level |
duke@435 | 78 | // suspension was considered "external", and this legacy naming scheme |
duke@435 | 79 | // remains. |
duke@435 | 80 | // |
duke@435 | 81 | // External suspend/resume requests come from JVM_SuspendThread, |
duke@435 | 82 | // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI |
duke@435 | 83 | // ResumeThread. External |
duke@435 | 84 | // suspend requests cause _external_suspend to be set and external |
duke@435 | 85 | // resume requests cause _external_suspend to be cleared. |
duke@435 | 86 | // External suspend requests do not nest on top of other external |
duke@435 | 87 | // suspend requests. The higher level APIs reject suspend requests |
duke@435 | 88 | // for already suspended threads. |
duke@435 | 89 | // |
duke@435 | 90 | // The external_suspend |
duke@435 | 91 | // flag is checked by has_special_runtime_exit_condition() and java thread |
duke@435 | 92 | // will self-suspend when handle_special_runtime_exit_condition() is |
duke@435 | 93 | // called. Most uses of the _thread_blocked state in JavaThreads are |
duke@435 | 94 | // considered the same as being externally suspended; if the blocking |
duke@435 | 95 | // condition lifts, the JavaThread will self-suspend. Other places |
duke@435 | 96 | // where VM checks for external_suspend include: |
duke@435 | 97 | // + mutex granting (do not enter monitors when thread is suspended) |
duke@435 | 98 | // + state transitions from _thread_in_native |
duke@435 | 99 | // |
duke@435 | 100 | // In general, java_suspend() does not wait for an external suspend |
duke@435 | 101 | // request to complete. When it returns, the only guarantee is that |
duke@435 | 102 | // the _external_suspend field is true. |
duke@435 | 103 | // |
duke@435 | 104 | // wait_for_ext_suspend_completion() is used to wait for an external |
duke@435 | 105 | // suspend request to complete. External suspend requests are usually |
duke@435 | 106 | // followed by some other interface call that requires the thread to |
duke@435 | 107 | // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into |
duke@435 | 108 | // the interface that requires quiescence, we give the JavaThread a |
duke@435 | 109 | // chance to self-suspend before we need it to be quiescent. This |
duke@435 | 110 | // improves overall suspend/query performance. |
duke@435 | 111 | // |
duke@435 | 112 | // _suspend_flags controls the behavior of java_ suspend/resume. |
duke@435 | 113 | // It must be set under the protection of SR_lock. Read from the flag is |
duke@435 | 114 | // OK without SR_lock as long as the value is only used as a hint. |
duke@435 | 115 | // (e.g., check _external_suspend first without lock and then recheck |
duke@435 | 116 | // inside SR_lock and finish the suspension) |
duke@435 | 117 | // |
duke@435 | 118 | // _suspend_flags is also overloaded for other "special conditions" so |
duke@435 | 119 | // that a single check indicates whether any special action is needed |
duke@435 | 120 | // eg. for async exceptions. |
duke@435 | 121 | // ------------------------------------------------------------------- |
duke@435 | 122 | // Notes: |
duke@435 | 123 | // 1. The suspend/resume logic no longer uses ThreadState in OSThread |
duke@435 | 124 | // but we still update its value to keep other part of the system (mainly |
duke@435 | 125 | // JVMTI) happy. ThreadState is legacy code (see notes in |
duke@435 | 126 | // osThread.hpp). |
duke@435 | 127 | // |
duke@435 | 128 | // 2. It would be more natural if set_external_suspend() is private and |
duke@435 | 129 | // part of java_suspend(), but that probably would affect the suspend/query |
duke@435 | 130 | // performance. Need more investigation on this. |
duke@435 | 131 | // |
duke@435 | 132 | |
duke@435 | 133 | // suspend/resume lock: used for self-suspend |
duke@435 | 134 | Monitor* _SR_lock; |
duke@435 | 135 | |
duke@435 | 136 | protected: |
duke@435 | 137 | enum SuspendFlags { |
duke@435 | 138 | // NOTE: avoid using the sign-bit as cc generates different test code |
duke@435 | 139 | // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 |
duke@435 | 140 | |
duke@435 | 141 | _external_suspend = 0x20000000U, // thread is asked to self suspend |
duke@435 | 142 | _ext_suspended = 0x40000000U, // thread has self-suspended |
duke@435 | 143 | _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt |
duke@435 | 144 | |
duke@435 | 145 | _has_async_exception = 0x00000001U // there is a pending async exception |
duke@435 | 146 | }; |
duke@435 | 147 | |
duke@435 | 148 | // various suspension related flags - atomically updated |
duke@435 | 149 | // overloaded for async exception checking in check_special_condition_for_native_trans. |
duke@435 | 150 | volatile uint32_t _suspend_flags; |
duke@435 | 151 | |
duke@435 | 152 | private: |
duke@435 | 153 | int _num_nested_signal; |
duke@435 | 154 | |
duke@435 | 155 | public: |
duke@435 | 156 | void enter_signal_handler() { _num_nested_signal++; } |
duke@435 | 157 | void leave_signal_handler() { _num_nested_signal--; } |
duke@435 | 158 | bool is_inside_signal_handler() const { return _num_nested_signal > 0; } |
duke@435 | 159 | |
duke@435 | 160 | private: |
duke@435 | 161 | // Debug tracing |
duke@435 | 162 | static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; |
duke@435 | 163 | |
duke@435 | 164 | // Active_handles points to a block of handles |
duke@435 | 165 | JNIHandleBlock* _active_handles; |
duke@435 | 166 | |
duke@435 | 167 | // One-element thread local free list |
duke@435 | 168 | JNIHandleBlock* _free_handle_block; |
duke@435 | 169 | |
duke@435 | 170 | // Point to the last handle mark |
duke@435 | 171 | HandleMark* _last_handle_mark; |
duke@435 | 172 | |
duke@435 | 173 | // The parity of the last strong_roots iteration in which this thread was |
duke@435 | 174 | // claimed as a task. |
duke@435 | 175 | jint _oops_do_parity; |
duke@435 | 176 | |
duke@435 | 177 | public: |
duke@435 | 178 | void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } |
duke@435 | 179 | HandleMark* last_handle_mark() const { return _last_handle_mark; } |
duke@435 | 180 | private: |
duke@435 | 181 | |
duke@435 | 182 | // debug support for checking if code does allow safepoints or not |
duke@435 | 183 | // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on |
duke@435 | 184 | // mutex, or blocking on an object synchronizer (Java locking). |
duke@435 | 185 | // If !allow_safepoint(), then an assertion failure will happen in any of the above cases |
duke@435 | 186 | // If !allow_allocation(), then an assertion failure will happen during allocation |
duke@435 | 187 | // (Hence, !allow_safepoint() => !allow_allocation()). |
duke@435 | 188 | // |
duke@435 | 189 | // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. |
duke@435 | 190 | // |
duke@435 | 191 | NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen |
duke@435 | 192 | debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. |
duke@435 | 193 | |
duke@435 | 194 | // Record when GC is locked out via the GC_locker mechanism |
duke@435 | 195 | CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) |
duke@435 | 196 | |
duke@435 | 197 | friend class No_Alloc_Verifier; |
duke@435 | 198 | friend class No_Safepoint_Verifier; |
duke@435 | 199 | friend class Pause_No_Safepoint_Verifier; |
duke@435 | 200 | friend class ThreadLocalStorage; |
duke@435 | 201 | friend class GC_locker; |
duke@435 | 202 | |
duke@435 | 203 | // In order for all threads to be able to use fast locking, we need to know the highest stack |
duke@435 | 204 | // address of where a lock is on the stack (stacks normally grow towards lower addresses). This |
duke@435 | 205 | // variable is initially set to NULL, indicating no locks are used by the thread. During the thread's |
duke@435 | 206 | // execution, it will be set whenever locking can happen, i.e., when we call out to Java code or use |
duke@435 | 207 | // an ObjectLocker. The value is never decreased, hence, it will over the lifetime of a thread |
duke@435 | 208 | // approximate the real stackbase. |
duke@435 | 209 | address _highest_lock; // Highest stack address where a JavaLock exist |
duke@435 | 210 | |
duke@435 | 211 | ThreadLocalAllocBuffer _tlab; // Thread-local eden |
duke@435 | 212 | |
duke@435 | 213 | int _vm_operation_started_count; // VM_Operation support |
duke@435 | 214 | int _vm_operation_completed_count; // VM_Operation support |
duke@435 | 215 | |
duke@435 | 216 | ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread |
duke@435 | 217 | // is waiting to lock |
duke@435 | 218 | bool _current_pending_monitor_is_from_java; // locking is from Java code |
duke@435 | 219 | |
duke@435 | 220 | // ObjectMonitor on which this thread called Object.wait() |
duke@435 | 221 | ObjectMonitor* _current_waiting_monitor; |
duke@435 | 222 | |
duke@435 | 223 | // Private thread-local objectmonitor list - a simple cache organized as a SLL. |
duke@435 | 224 | public: |
duke@435 | 225 | ObjectMonitor * omFreeList ; |
duke@435 | 226 | int omFreeCount ; // length of omFreeList |
duke@435 | 227 | int omFreeProvision ; // reload chunk size |
duke@435 | 228 | |
duke@435 | 229 | public: |
duke@435 | 230 | enum { |
duke@435 | 231 | is_definitely_current_thread = true |
duke@435 | 232 | }; |
duke@435 | 233 | |
duke@435 | 234 | // Constructor |
duke@435 | 235 | Thread(); |
duke@435 | 236 | virtual ~Thread(); |
duke@435 | 237 | |
duke@435 | 238 | // initializtion |
duke@435 | 239 | void initialize_thread_local_storage(); |
duke@435 | 240 | |
duke@435 | 241 | // thread entry point |
duke@435 | 242 | virtual void run(); |
duke@435 | 243 | |
duke@435 | 244 | // Testers |
duke@435 | 245 | virtual bool is_VM_thread() const { return false; } |
duke@435 | 246 | virtual bool is_Java_thread() const { return false; } |
duke@435 | 247 | // Remove this ifdef when C1 is ported to the compiler interface. |
duke@435 | 248 | virtual bool is_Compiler_thread() const { return false; } |
duke@435 | 249 | virtual bool is_hidden_from_external_view() const { return false; } |
duke@435 | 250 | virtual bool is_jvmti_agent_thread() const { return false; } |
duke@435 | 251 | // True iff the thread can perform GC operations at a safepoint. |
duke@435 | 252 | // Generally will be true only of VM thread and parallel GC WorkGang |
duke@435 | 253 | // threads. |
duke@435 | 254 | virtual bool is_GC_task_thread() const { return false; } |
duke@435 | 255 | virtual bool is_Watcher_thread() const { return false; } |
duke@435 | 256 | virtual bool is_ConcurrentGC_thread() const { return false; } |
duke@435 | 257 | |
duke@435 | 258 | virtual char* name() const { return (char*)"Unknown thread"; } |
duke@435 | 259 | |
duke@435 | 260 | // Returns the current thread |
duke@435 | 261 | static inline Thread* current(); |
duke@435 | 262 | |
duke@435 | 263 | // Common thread operations |
duke@435 | 264 | static void set_priority(Thread* thread, ThreadPriority priority); |
duke@435 | 265 | static ThreadPriority get_priority(const Thread* const thread); |
duke@435 | 266 | static void start(Thread* thread); |
duke@435 | 267 | static void interrupt(Thread* thr); |
duke@435 | 268 | static bool is_interrupted(Thread* thr, bool clear_interrupted); |
duke@435 | 269 | |
duke@435 | 270 | Monitor* SR_lock() const { return _SR_lock; } |
duke@435 | 271 | |
duke@435 | 272 | bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } |
duke@435 | 273 | |
duke@435 | 274 | void set_suspend_flag(SuspendFlags f) { |
duke@435 | 275 | assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); |
duke@435 | 276 | uint32_t flags; |
duke@435 | 277 | do { |
duke@435 | 278 | flags = _suspend_flags; |
duke@435 | 279 | } |
duke@435 | 280 | while (Atomic::cmpxchg((jint)(flags | f), |
duke@435 | 281 | (volatile jint*)&_suspend_flags, |
duke@435 | 282 | (jint)flags) != (jint)flags); |
duke@435 | 283 | } |
duke@435 | 284 | void clear_suspend_flag(SuspendFlags f) { |
duke@435 | 285 | assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); |
duke@435 | 286 | uint32_t flags; |
duke@435 | 287 | do { |
duke@435 | 288 | flags = _suspend_flags; |
duke@435 | 289 | } |
duke@435 | 290 | while (Atomic::cmpxchg((jint)(flags & ~f), |
duke@435 | 291 | (volatile jint*)&_suspend_flags, |
duke@435 | 292 | (jint)flags) != (jint)flags); |
duke@435 | 293 | } |
duke@435 | 294 | |
duke@435 | 295 | void set_has_async_exception() { |
duke@435 | 296 | set_suspend_flag(_has_async_exception); |
duke@435 | 297 | } |
duke@435 | 298 | void clear_has_async_exception() { |
duke@435 | 299 | clear_suspend_flag(_has_async_exception); |
duke@435 | 300 | } |
duke@435 | 301 | |
duke@435 | 302 | // Support for Unhandled Oop detection |
duke@435 | 303 | #ifdef CHECK_UNHANDLED_OOPS |
duke@435 | 304 | private: |
duke@435 | 305 | UnhandledOops *_unhandled_oops; |
duke@435 | 306 | public: |
duke@435 | 307 | UnhandledOops* unhandled_oops() { return _unhandled_oops; } |
duke@435 | 308 | // Mark oop safe for gc. It may be stack allocated but won't move. |
duke@435 | 309 | void allow_unhandled_oop(oop *op) { |
duke@435 | 310 | if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); |
duke@435 | 311 | } |
duke@435 | 312 | // Clear oops at safepoint so crashes point to unhandled oop violator |
duke@435 | 313 | void clear_unhandled_oops() { |
duke@435 | 314 | if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); |
duke@435 | 315 | } |
duke@435 | 316 | bool is_gc_locked_out() { return _gc_locked_out_count > 0; } |
duke@435 | 317 | #endif // CHECK_UNHANDLED_OOPS |
duke@435 | 318 | |
duke@435 | 319 | public: |
duke@435 | 320 | // Installs a pending exception to be inserted later |
duke@435 | 321 | static void send_async_exception(oop thread_oop, oop java_throwable); |
duke@435 | 322 | |
duke@435 | 323 | // Resource area |
duke@435 | 324 | ResourceArea* resource_area() const { return _resource_area; } |
duke@435 | 325 | void set_resource_area(ResourceArea* area) { _resource_area = area; } |
duke@435 | 326 | |
duke@435 | 327 | OSThread* osthread() const { return _osthread; } |
duke@435 | 328 | void set_osthread(OSThread* thread) { _osthread = thread; } |
duke@435 | 329 | |
duke@435 | 330 | // JNI handle support |
duke@435 | 331 | JNIHandleBlock* active_handles() const { return _active_handles; } |
duke@435 | 332 | void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } |
duke@435 | 333 | JNIHandleBlock* free_handle_block() const { return _free_handle_block; } |
duke@435 | 334 | void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } |
duke@435 | 335 | |
duke@435 | 336 | // Internal handle support |
duke@435 | 337 | HandleArea* handle_area() const { return _handle_area; } |
duke@435 | 338 | void set_handle_area(HandleArea* area) { _handle_area = area; } |
duke@435 | 339 | |
duke@435 | 340 | // Thread-Local Allocation Buffer (TLAB) support |
duke@435 | 341 | ThreadLocalAllocBuffer& tlab() { return _tlab; } |
duke@435 | 342 | void initialize_tlab() { |
duke@435 | 343 | if (UseTLAB) { |
duke@435 | 344 | tlab().initialize(); |
duke@435 | 345 | } |
duke@435 | 346 | } |
duke@435 | 347 | |
duke@435 | 348 | // VM operation support |
duke@435 | 349 | int vm_operation_ticket() { return ++_vm_operation_started_count; } |
duke@435 | 350 | int vm_operation_completed_count() { return _vm_operation_completed_count; } |
duke@435 | 351 | void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } |
duke@435 | 352 | |
duke@435 | 353 | // For tracking the heavyweight monitor the thread is pending on. |
duke@435 | 354 | ObjectMonitor* current_pending_monitor() { |
duke@435 | 355 | return _current_pending_monitor; |
duke@435 | 356 | } |
duke@435 | 357 | void set_current_pending_monitor(ObjectMonitor* monitor) { |
duke@435 | 358 | _current_pending_monitor = monitor; |
duke@435 | 359 | } |
duke@435 | 360 | void set_current_pending_monitor_is_from_java(bool from_java) { |
duke@435 | 361 | _current_pending_monitor_is_from_java = from_java; |
duke@435 | 362 | } |
duke@435 | 363 | bool current_pending_monitor_is_from_java() { |
duke@435 | 364 | return _current_pending_monitor_is_from_java; |
duke@435 | 365 | } |
duke@435 | 366 | |
duke@435 | 367 | // For tracking the ObjectMonitor on which this thread called Object.wait() |
duke@435 | 368 | ObjectMonitor* current_waiting_monitor() { |
duke@435 | 369 | return _current_waiting_monitor; |
duke@435 | 370 | } |
duke@435 | 371 | void set_current_waiting_monitor(ObjectMonitor* monitor) { |
duke@435 | 372 | _current_waiting_monitor = monitor; |
duke@435 | 373 | } |
duke@435 | 374 | |
duke@435 | 375 | // GC support |
duke@435 | 376 | // Apply "f->do_oop" to all root oops in "this". |
duke@435 | 377 | void oops_do(OopClosure* f); |
duke@435 | 378 | |
duke@435 | 379 | // Handles the parallel case for the method below. |
duke@435 | 380 | private: |
duke@435 | 381 | bool claim_oops_do_par_case(int collection_parity); |
duke@435 | 382 | public: |
duke@435 | 383 | // Requires that "collection_parity" is that of the current strong roots |
duke@435 | 384 | // iteration. If "is_par" is false, sets the parity of "this" to |
duke@435 | 385 | // "collection_parity", and returns "true". If "is_par" is true, |
duke@435 | 386 | // uses an atomic instruction to set the current threads parity to |
duke@435 | 387 | // "collection_parity", if it is not already. Returns "true" iff the |
duke@435 | 388 | // calling thread does the update, this indicates that the calling thread |
duke@435 | 389 | // has claimed the thread's stack as a root groop in the current |
duke@435 | 390 | // collection. |
duke@435 | 391 | bool claim_oops_do(bool is_par, int collection_parity) { |
duke@435 | 392 | if (!is_par) { |
duke@435 | 393 | _oops_do_parity = collection_parity; |
duke@435 | 394 | return true; |
duke@435 | 395 | } else { |
duke@435 | 396 | return claim_oops_do_par_case(collection_parity); |
duke@435 | 397 | } |
duke@435 | 398 | } |
duke@435 | 399 | |
duke@435 | 400 | // Sweeper support |
duke@435 | 401 | void nmethods_do(); |
duke@435 | 402 | |
duke@435 | 403 | // Fast-locking support |
duke@435 | 404 | address highest_lock() const { return _highest_lock; } |
duke@435 | 405 | void update_highest_lock(address base) { if (base > _highest_lock) _highest_lock = base; } |
duke@435 | 406 | |
duke@435 | 407 | // Tells if adr belong to this thread. This is used |
duke@435 | 408 | // for checking if a lock is owned by the running thread. |
duke@435 | 409 | // Warning: the method can only be used on the running thread |
duke@435 | 410 | // Fast lock support uses these methods |
duke@435 | 411 | virtual bool lock_is_in_stack(address adr) const; |
duke@435 | 412 | virtual bool is_lock_owned(address adr) const; |
duke@435 | 413 | |
duke@435 | 414 | // Check if address is in the stack of the thread (not just for locks). |
duke@435 | 415 | bool is_in_stack(address adr) const; |
duke@435 | 416 | |
duke@435 | 417 | // Sets this thread as starting thread. Returns failure if thread |
duke@435 | 418 | // creation fails due to lack of memory, too many threads etc. |
duke@435 | 419 | bool set_as_starting_thread(); |
duke@435 | 420 | |
duke@435 | 421 | protected: |
duke@435 | 422 | // OS data associated with the thread |
duke@435 | 423 | OSThread* _osthread; // Platform-specific thread information |
duke@435 | 424 | |
duke@435 | 425 | // Thread local resource area for temporary allocation within the VM |
duke@435 | 426 | ResourceArea* _resource_area; |
duke@435 | 427 | |
duke@435 | 428 | // Thread local handle area for allocation of handles within the VM |
duke@435 | 429 | HandleArea* _handle_area; |
duke@435 | 430 | |
duke@435 | 431 | // Support for stack overflow handling, get_thread, etc. |
duke@435 | 432 | address _stack_base; |
duke@435 | 433 | size_t _stack_size; |
duke@435 | 434 | uintptr_t _self_raw_id; // used by get_thread (mutable) |
duke@435 | 435 | int _lgrp_id; |
duke@435 | 436 | |
duke@435 | 437 | public: |
duke@435 | 438 | // Stack overflow support |
duke@435 | 439 | address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } |
duke@435 | 440 | |
duke@435 | 441 | void set_stack_base(address base) { _stack_base = base; } |
duke@435 | 442 | size_t stack_size() const { return _stack_size; } |
duke@435 | 443 | void set_stack_size(size_t size) { _stack_size = size; } |
duke@435 | 444 | void record_stack_base_and_size(); |
duke@435 | 445 | |
duke@435 | 446 | int lgrp_id() const { return _lgrp_id; } |
duke@435 | 447 | void set_lgrp_id(int value) { _lgrp_id = value; } |
duke@435 | 448 | |
duke@435 | 449 | // Printing |
duke@435 | 450 | void print_on(outputStream* st) const; |
duke@435 | 451 | void print() const { print_on(tty); } |
duke@435 | 452 | virtual void print_on_error(outputStream* st, char* buf, int buflen) const; |
duke@435 | 453 | |
duke@435 | 454 | // Debug-only code |
duke@435 | 455 | |
duke@435 | 456 | #ifdef ASSERT |
duke@435 | 457 | private: |
duke@435 | 458 | // Deadlock detection support for Mutex locks. List of locks own by thread. |
duke@435 | 459 | Monitor *_owned_locks; |
duke@435 | 460 | // Mutex::set_owner_implementation is the only place where _owned_locks is modified, |
duke@435 | 461 | // thus the friendship |
duke@435 | 462 | friend class Mutex; |
duke@435 | 463 | friend class Monitor; |
duke@435 | 464 | |
duke@435 | 465 | public: |
duke@435 | 466 | void print_owned_locks_on(outputStream* st) const; |
duke@435 | 467 | void print_owned_locks() const { print_owned_locks_on(tty); } |
duke@435 | 468 | Monitor * owned_locks() const { return _owned_locks; } |
duke@435 | 469 | bool owns_locks() const { return owned_locks() != NULL; } |
duke@435 | 470 | bool owns_locks_but_compiled_lock() const; |
duke@435 | 471 | |
duke@435 | 472 | // Deadlock detection |
duke@435 | 473 | bool allow_allocation() { return _allow_allocation_count == 0; } |
duke@435 | 474 | #endif |
duke@435 | 475 | |
duke@435 | 476 | void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; |
duke@435 | 477 | |
duke@435 | 478 | private: |
duke@435 | 479 | volatile int _jvmti_env_iteration_count; |
duke@435 | 480 | |
duke@435 | 481 | public: |
duke@435 | 482 | void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } |
duke@435 | 483 | void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } |
duke@435 | 484 | bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } |
duke@435 | 485 | |
duke@435 | 486 | // Code generation |
duke@435 | 487 | static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } |
duke@435 | 488 | static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } |
duke@435 | 489 | static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } |
duke@435 | 490 | |
duke@435 | 491 | static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } |
duke@435 | 492 | static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } |
duke@435 | 493 | static ByteSize omFreeList_offset() { return byte_offset_of(Thread, omFreeList); } |
duke@435 | 494 | |
duke@435 | 495 | #define TLAB_FIELD_OFFSET(name) \ |
duke@435 | 496 | static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } |
duke@435 | 497 | |
duke@435 | 498 | TLAB_FIELD_OFFSET(start) |
duke@435 | 499 | TLAB_FIELD_OFFSET(end) |
duke@435 | 500 | TLAB_FIELD_OFFSET(top) |
duke@435 | 501 | TLAB_FIELD_OFFSET(pf_top) |
duke@435 | 502 | TLAB_FIELD_OFFSET(size) // desired_size |
duke@435 | 503 | TLAB_FIELD_OFFSET(refill_waste_limit) |
duke@435 | 504 | TLAB_FIELD_OFFSET(number_of_refills) |
duke@435 | 505 | TLAB_FIELD_OFFSET(fast_refill_waste) |
duke@435 | 506 | TLAB_FIELD_OFFSET(slow_allocations) |
duke@435 | 507 | |
duke@435 | 508 | #undef TLAB_FIELD_OFFSET |
duke@435 | 509 | |
duke@435 | 510 | public: |
duke@435 | 511 | volatile intptr_t _Stalled ; |
duke@435 | 512 | volatile int _TypeTag ; |
duke@435 | 513 | ParkEvent * _ParkEvent ; // for synchronized() |
duke@435 | 514 | ParkEvent * _SleepEvent ; // for Thread.sleep |
duke@435 | 515 | ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor |
duke@435 | 516 | ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease |
duke@435 | 517 | int NativeSyncRecursion ; // diagnostic |
duke@435 | 518 | |
duke@435 | 519 | volatile int _OnTrap ; // Resume-at IP delta |
duke@435 | 520 | jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG |
duke@435 | 521 | jint _hashStateX ; // thread-specific hashCode generator state |
duke@435 | 522 | jint _hashStateY ; |
duke@435 | 523 | jint _hashStateZ ; |
duke@435 | 524 | void * _schedctl ; |
duke@435 | 525 | |
duke@435 | 526 | intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code |
duke@435 | 527 | static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } |
duke@435 | 528 | static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } |
duke@435 | 529 | |
duke@435 | 530 | volatile jint rng [4] ; // RNG for spin loop |
duke@435 | 531 | |
duke@435 | 532 | // Low-level leaf-lock primitives used to implement synchronization |
duke@435 | 533 | // and native monitor-mutex infrastructure. |
duke@435 | 534 | // Not for general synchronization use. |
duke@435 | 535 | static void SpinAcquire (volatile int * Lock, const char * Name) ; |
duke@435 | 536 | static void SpinRelease (volatile int * Lock) ; |
duke@435 | 537 | static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; |
duke@435 | 538 | static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; |
duke@435 | 539 | static void muxRelease (volatile intptr_t * Lock) ; |
duke@435 | 540 | |
duke@435 | 541 | }; |
duke@435 | 542 | |
duke@435 | 543 | // Inline implementation of Thread::current() |
duke@435 | 544 | // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of |
duke@435 | 545 | // startup. |
duke@435 | 546 | // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same |
duke@435 | 547 | // period. This is inlined in thread_<os_family>.inline.hpp. |
duke@435 | 548 | |
duke@435 | 549 | inline Thread* Thread::current() { |
duke@435 | 550 | #ifdef ASSERT |
duke@435 | 551 | // This function is very high traffic. Define PARANOID to enable expensive |
duke@435 | 552 | // asserts. |
duke@435 | 553 | #ifdef PARANOID |
duke@435 | 554 | // Signal handler should call ThreadLocalStorage::get_thread_slow() |
duke@435 | 555 | Thread* t = ThreadLocalStorage::get_thread_slow(); |
duke@435 | 556 | assert(t != NULL && !t->is_inside_signal_handler(), |
duke@435 | 557 | "Don't use Thread::current() inside signal handler"); |
duke@435 | 558 | #endif |
duke@435 | 559 | #endif |
duke@435 | 560 | Thread* thread = ThreadLocalStorage::thread(); |
duke@435 | 561 | assert(thread != NULL, "just checking"); |
duke@435 | 562 | return thread; |
duke@435 | 563 | } |
duke@435 | 564 | |
duke@435 | 565 | // Name support for threads. non-JavaThread subclasses with multiple |
duke@435 | 566 | // uniquely named instances should derive from this. |
duke@435 | 567 | class NamedThread: public Thread { |
duke@435 | 568 | friend class VMStructs; |
duke@435 | 569 | enum { |
duke@435 | 570 | max_name_len = 64 |
duke@435 | 571 | }; |
duke@435 | 572 | private: |
duke@435 | 573 | char* _name; |
duke@435 | 574 | public: |
duke@435 | 575 | NamedThread(); |
duke@435 | 576 | ~NamedThread(); |
duke@435 | 577 | // May only be called once per thread. |
duke@435 | 578 | void set_name(const char* format, ...); |
duke@435 | 579 | virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
duke@435 | 580 | }; |
duke@435 | 581 | |
duke@435 | 582 | // Worker threads are named and have an id of an assigned work. |
duke@435 | 583 | class WorkerThread: public NamedThread { |
duke@435 | 584 | private: |
duke@435 | 585 | uint _id; |
duke@435 | 586 | public: |
duke@435 | 587 | WorkerThread() : _id(0) { } |
duke@435 | 588 | void set_id(uint work_id) { _id = work_id; } |
duke@435 | 589 | uint id() const { return _id; } |
duke@435 | 590 | }; |
duke@435 | 591 | |
duke@435 | 592 | // A single WatcherThread is used for simulating timer interrupts. |
duke@435 | 593 | class WatcherThread: public Thread { |
duke@435 | 594 | friend class VMStructs; |
duke@435 | 595 | public: |
duke@435 | 596 | virtual void run(); |
duke@435 | 597 | |
duke@435 | 598 | private: |
duke@435 | 599 | static WatcherThread* _watcher_thread; |
duke@435 | 600 | |
duke@435 | 601 | static bool _should_terminate; |
duke@435 | 602 | public: |
duke@435 | 603 | enum SomeConstants { |
duke@435 | 604 | delay_interval = 10 // interrupt delay in milliseconds |
duke@435 | 605 | }; |
duke@435 | 606 | |
duke@435 | 607 | // Constructor |
duke@435 | 608 | WatcherThread(); |
duke@435 | 609 | |
duke@435 | 610 | // Tester |
duke@435 | 611 | bool is_Watcher_thread() const { return true; } |
duke@435 | 612 | |
duke@435 | 613 | // Printing |
duke@435 | 614 | char* name() const { return (char*)"VM Periodic Task Thread"; } |
duke@435 | 615 | void print_on(outputStream* st) const; |
duke@435 | 616 | void print() const { print_on(tty); } |
duke@435 | 617 | |
duke@435 | 618 | // Returns the single instance of WatcherThread |
duke@435 | 619 | static WatcherThread* watcher_thread() { return _watcher_thread; } |
duke@435 | 620 | |
duke@435 | 621 | // Create and start the single instance of WatcherThread, or stop it on shutdown |
duke@435 | 622 | static void start(); |
duke@435 | 623 | static void stop(); |
duke@435 | 624 | }; |
duke@435 | 625 | |
duke@435 | 626 | |
duke@435 | 627 | class CompilerThread; |
duke@435 | 628 | |
duke@435 | 629 | typedef void (*ThreadFunction)(JavaThread*, TRAPS); |
duke@435 | 630 | |
duke@435 | 631 | class JavaThread: public Thread { |
duke@435 | 632 | friend class VMStructs; |
duke@435 | 633 | private: |
duke@435 | 634 | JavaThread* _next; // The next thread in the Threads list |
duke@435 | 635 | oop _threadObj; // The Java level thread object |
duke@435 | 636 | |
duke@435 | 637 | #ifdef ASSERT |
duke@435 | 638 | private: |
duke@435 | 639 | int _java_call_counter; |
duke@435 | 640 | |
duke@435 | 641 | public: |
duke@435 | 642 | int java_call_counter() { return _java_call_counter; } |
duke@435 | 643 | void inc_java_call_counter() { _java_call_counter++; } |
duke@435 | 644 | void dec_java_call_counter() { |
duke@435 | 645 | assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); |
duke@435 | 646 | _java_call_counter--; |
duke@435 | 647 | } |
duke@435 | 648 | private: // restore original namespace restriction |
duke@435 | 649 | #endif // ifdef ASSERT |
duke@435 | 650 | |
duke@435 | 651 | #ifndef PRODUCT |
duke@435 | 652 | public: |
duke@435 | 653 | enum { |
duke@435 | 654 | jump_ring_buffer_size = 16 |
duke@435 | 655 | }; |
duke@435 | 656 | private: // restore original namespace restriction |
duke@435 | 657 | #endif |
duke@435 | 658 | |
duke@435 | 659 | JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state |
duke@435 | 660 | |
duke@435 | 661 | ThreadFunction _entry_point; |
duke@435 | 662 | |
duke@435 | 663 | JNIEnv _jni_environment; |
duke@435 | 664 | |
duke@435 | 665 | // Deopt support |
duke@435 | 666 | DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization |
duke@435 | 667 | |
duke@435 | 668 | intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we |
duke@435 | 669 | // transition out of native |
duke@435 | 670 | |
duke@435 | 671 | vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays |
duke@435 | 672 | vframeArray* _vframe_array_last; // Holds last vFrameArray we popped |
duke@435 | 673 | // Because deoptimization is lazy we must save jvmti requests to set locals |
duke@435 | 674 | // in compiled frames until we deoptimize and we have an interpreter frame. |
duke@435 | 675 | // This holds the pointer to array (yeah like there might be more than one) of |
duke@435 | 676 | // description of compiled vframes that have locals that need to be updated. |
duke@435 | 677 | GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; |
duke@435 | 678 | |
duke@435 | 679 | // Handshake value for fixing 6243940. We need a place for the i2c |
duke@435 | 680 | // adapter to store the callee methodOop. This value is NEVER live |
duke@435 | 681 | // across a gc point so it does NOT have to be gc'd |
duke@435 | 682 | // The handshake is open ended since we can't be certain that it will |
duke@435 | 683 | // be NULLed. This is because we rarely ever see the race and end up |
duke@435 | 684 | // in handle_wrong_method which is the backend of the handshake. See |
duke@435 | 685 | // code in i2c adapters and handle_wrong_method. |
duke@435 | 686 | |
duke@435 | 687 | methodOop _callee_target; |
duke@435 | 688 | |
duke@435 | 689 | // Oop results of VM runtime calls |
duke@435 | 690 | oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved |
duke@435 | 691 | oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved |
duke@435 | 692 | |
duke@435 | 693 | MonitorChunk* _monitor_chunks; // Contains the off stack monitors |
duke@435 | 694 | // allocated during deoptimization |
duke@435 | 695 | // and by JNI_MonitorEnter/Exit |
duke@435 | 696 | |
duke@435 | 697 | // Async. requests support |
duke@435 | 698 | enum AsyncRequests { |
duke@435 | 699 | _no_async_condition = 0, |
duke@435 | 700 | _async_exception, |
duke@435 | 701 | _async_unsafe_access_error |
duke@435 | 702 | }; |
duke@435 | 703 | AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request |
duke@435 | 704 | oop _pending_async_exception; |
duke@435 | 705 | |
duke@435 | 706 | // Safepoint support |
duke@435 | 707 | public: // Expose _thread_state for SafeFetchInt() |
duke@435 | 708 | volatile JavaThreadState _thread_state; |
duke@435 | 709 | private: |
duke@435 | 710 | ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint |
duke@435 | 711 | address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened |
duke@435 | 712 | |
duke@435 | 713 | // JavaThread termination support |
duke@435 | 714 | enum TerminatedTypes { |
duke@435 | 715 | _not_terminated = 0xDEAD - 2, |
duke@435 | 716 | _thread_exiting, // JavaThread::exit() has been called for this thread |
duke@435 | 717 | _thread_terminated, // JavaThread is removed from thread list |
duke@435 | 718 | _vm_exited // JavaThread is still executing native code, but VM is terminated |
duke@435 | 719 | // only VM_Exit can set _vm_exited |
duke@435 | 720 | }; |
duke@435 | 721 | |
duke@435 | 722 | // In general a JavaThread's _terminated field transitions as follows: |
duke@435 | 723 | // |
duke@435 | 724 | // _not_terminated => _thread_exiting => _thread_terminated |
duke@435 | 725 | // |
duke@435 | 726 | // _vm_exited is a special value to cover the case of a JavaThread |
duke@435 | 727 | // executing native code after the VM itself is terminated. |
duke@435 | 728 | TerminatedTypes _terminated; |
duke@435 | 729 | // suspend/resume support |
duke@435 | 730 | volatile bool _suspend_equivalent; // Suspend equivalent condition |
duke@435 | 731 | jint _in_deopt_handler; // count of deoptimization |
duke@435 | 732 | // handlers thread is in |
duke@435 | 733 | volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access |
duke@435 | 734 | bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was |
duke@435 | 735 | // never locked) when throwing an exception. Used by interpreter only. |
duke@435 | 736 | |
duke@435 | 737 | // Flag to mark a JNI thread in the process of attaching - See CR 6404306 |
duke@435 | 738 | // This flag is never set true other than at construction, and in that case |
duke@435 | 739 | // is shortly thereafter set false |
duke@435 | 740 | volatile bool _is_attaching; |
duke@435 | 741 | |
duke@435 | 742 | public: |
duke@435 | 743 | // State of the stack guard pages for this thread. |
duke@435 | 744 | enum StackGuardState { |
duke@435 | 745 | stack_guard_unused, // not needed |
duke@435 | 746 | stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow |
duke@435 | 747 | stack_guard_enabled // enabled |
duke@435 | 748 | }; |
duke@435 | 749 | |
duke@435 | 750 | private: |
duke@435 | 751 | |
duke@435 | 752 | StackGuardState _stack_guard_state; |
duke@435 | 753 | |
duke@435 | 754 | // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is |
duke@435 | 755 | // used to temp. parsing values into and out of the runtime system during exception handling for compiled |
duke@435 | 756 | // code) |
duke@435 | 757 | volatile oop _exception_oop; // Exception thrown in compiled code |
duke@435 | 758 | volatile address _exception_pc; // PC where exception happened |
duke@435 | 759 | volatile address _exception_handler_pc; // PC for handler of exception |
duke@435 | 760 | volatile int _exception_stack_size; // Size of frame where exception happened |
duke@435 | 761 | |
duke@435 | 762 | // support for compilation |
duke@435 | 763 | bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) |
duke@435 | 764 | |
duke@435 | 765 | // support for JNI critical regions |
duke@435 | 766 | jint _jni_active_critical; // count of entries into JNI critical region |
duke@435 | 767 | |
duke@435 | 768 | // For deadlock detection. |
duke@435 | 769 | int _depth_first_number; |
duke@435 | 770 | |
duke@435 | 771 | // JVMTI PopFrame support |
duke@435 | 772 | // This is set to popframe_pending to signal that top Java frame should be popped immediately |
duke@435 | 773 | int _popframe_condition; |
duke@435 | 774 | |
duke@435 | 775 | #ifndef PRODUCT |
duke@435 | 776 | int _jmp_ring_index; |
duke@435 | 777 | struct { |
duke@435 | 778 | // We use intptr_t instead of address so debugger doesn't try and display strings |
duke@435 | 779 | intptr_t _target; |
duke@435 | 780 | intptr_t _instruction; |
duke@435 | 781 | const char* _file; |
duke@435 | 782 | int _line; |
duke@435 | 783 | } _jmp_ring[ jump_ring_buffer_size ]; |
duke@435 | 784 | #endif /* PRODUCT */ |
duke@435 | 785 | |
ysr@777 | 786 | #ifndef SERIALGC |
ysr@777 | 787 | // Support for G1 barriers |
ysr@777 | 788 | |
ysr@777 | 789 | ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. |
ysr@777 | 790 | // Set of all such queues. |
ysr@777 | 791 | static SATBMarkQueueSet _satb_mark_queue_set; |
ysr@777 | 792 | |
ysr@777 | 793 | DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. |
ysr@777 | 794 | // Set of all such queues. |
ysr@777 | 795 | static DirtyCardQueueSet _dirty_card_queue_set; |
iveresov@876 | 796 | |
iveresov@876 | 797 | void flush_barrier_queues(); |
ysr@777 | 798 | #endif // !SERIALGC |
ysr@777 | 799 | |
duke@435 | 800 | friend class VMThread; |
duke@435 | 801 | friend class ThreadWaitTransition; |
duke@435 | 802 | friend class VM_Exit; |
duke@435 | 803 | |
duke@435 | 804 | void initialize(); // Initialized the instance variables |
duke@435 | 805 | |
duke@435 | 806 | public: |
duke@435 | 807 | // Constructor |
duke@435 | 808 | JavaThread(bool is_attaching = false); // for main thread and JNI attached threads |
duke@435 | 809 | JavaThread(ThreadFunction entry_point, size_t stack_size = 0); |
duke@435 | 810 | ~JavaThread(); |
duke@435 | 811 | |
duke@435 | 812 | #ifdef ASSERT |
duke@435 | 813 | // verify this JavaThread hasn't be published in the Threads::list yet |
duke@435 | 814 | void verify_not_published(); |
duke@435 | 815 | #endif |
duke@435 | 816 | |
duke@435 | 817 | //JNI functiontable getter/setter for JVMTI jni function table interception API. |
duke@435 | 818 | void set_jni_functions(struct JNINativeInterface_* functionTable) { |
duke@435 | 819 | _jni_environment.functions = functionTable; |
duke@435 | 820 | } |
duke@435 | 821 | struct JNINativeInterface_* get_jni_functions() { |
duke@435 | 822 | return (struct JNINativeInterface_ *)_jni_environment.functions; |
duke@435 | 823 | } |
duke@435 | 824 | |
duke@435 | 825 | // Executes Shutdown.shutdown() |
duke@435 | 826 | void invoke_shutdown_hooks(); |
duke@435 | 827 | |
duke@435 | 828 | // Cleanup on thread exit |
duke@435 | 829 | enum ExitType { |
duke@435 | 830 | normal_exit, |
duke@435 | 831 | jni_detach |
duke@435 | 832 | }; |
duke@435 | 833 | void exit(bool destroy_vm, ExitType exit_type = normal_exit); |
duke@435 | 834 | |
duke@435 | 835 | void cleanup_failed_attach_current_thread(); |
duke@435 | 836 | |
duke@435 | 837 | // Testers |
duke@435 | 838 | virtual bool is_Java_thread() const { return true; } |
duke@435 | 839 | |
duke@435 | 840 | // compilation |
duke@435 | 841 | void set_is_compiling(bool f) { _is_compiling = f; } |
duke@435 | 842 | bool is_compiling() const { return _is_compiling; } |
duke@435 | 843 | |
duke@435 | 844 | // Thread chain operations |
duke@435 | 845 | JavaThread* next() const { return _next; } |
duke@435 | 846 | void set_next(JavaThread* p) { _next = p; } |
duke@435 | 847 | |
duke@435 | 848 | // Thread oop. threadObj() can be NULL for initial JavaThread |
duke@435 | 849 | // (or for threads attached via JNI) |
duke@435 | 850 | oop threadObj() const { return _threadObj; } |
duke@435 | 851 | void set_threadObj(oop p) { _threadObj = p; } |
duke@435 | 852 | |
duke@435 | 853 | ThreadPriority java_priority() const; // Read from threadObj() |
duke@435 | 854 | |
duke@435 | 855 | // Prepare thread and add to priority queue. If a priority is |
duke@435 | 856 | // not specified, use the priority of the thread object. Threads_lock |
duke@435 | 857 | // must be held while this function is called. |
duke@435 | 858 | void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); |
duke@435 | 859 | |
duke@435 | 860 | void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } |
duke@435 | 861 | address saved_exception_pc() { return _saved_exception_pc; } |
duke@435 | 862 | |
duke@435 | 863 | |
duke@435 | 864 | ThreadFunction entry_point() const { return _entry_point; } |
duke@435 | 865 | |
duke@435 | 866 | // Allocates a new Java level thread object for this thread. thread_name may be NULL. |
duke@435 | 867 | void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); |
duke@435 | 868 | |
duke@435 | 869 | // Last frame anchor routines |
duke@435 | 870 | |
duke@435 | 871 | JavaFrameAnchor* frame_anchor(void) { return &_anchor; } |
duke@435 | 872 | |
duke@435 | 873 | // last_Java_sp |
duke@435 | 874 | bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } |
duke@435 | 875 | intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } |
duke@435 | 876 | |
duke@435 | 877 | // last_Java_pc |
duke@435 | 878 | |
duke@435 | 879 | address last_Java_pc(void) { return _anchor.last_Java_pc(); } |
duke@435 | 880 | |
duke@435 | 881 | // Safepoint support |
duke@435 | 882 | JavaThreadState thread_state() const { return _thread_state; } |
duke@435 | 883 | void set_thread_state(JavaThreadState s) { _thread_state=s; } |
duke@435 | 884 | ThreadSafepointState *safepoint_state() const { return _safepoint_state; } |
duke@435 | 885 | void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } |
duke@435 | 886 | bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } |
duke@435 | 887 | |
duke@435 | 888 | // thread has called JavaThread::exit() or is terminated |
duke@435 | 889 | bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } |
duke@435 | 890 | // thread is terminated (no longer on the threads list); we compare |
duke@435 | 891 | // against the two non-terminated values so that a freed JavaThread |
duke@435 | 892 | // will also be considered terminated. |
duke@435 | 893 | bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } |
duke@435 | 894 | void set_terminated(TerminatedTypes t) { _terminated = t; } |
duke@435 | 895 | // special for Threads::remove() which is static: |
duke@435 | 896 | void set_terminated_value() { _terminated = _thread_terminated; } |
duke@435 | 897 | void block_if_vm_exited(); |
duke@435 | 898 | |
duke@435 | 899 | bool doing_unsafe_access() { return _doing_unsafe_access; } |
duke@435 | 900 | void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } |
duke@435 | 901 | |
duke@435 | 902 | bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } |
duke@435 | 903 | void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } |
duke@435 | 904 | |
duke@435 | 905 | |
duke@435 | 906 | // Suspend/resume support for JavaThread |
duke@435 | 907 | |
duke@435 | 908 | private: |
duke@435 | 909 | void set_ext_suspended() { set_suspend_flag (_ext_suspended); } |
duke@435 | 910 | void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } |
duke@435 | 911 | |
duke@435 | 912 | public: |
duke@435 | 913 | void java_suspend(); |
duke@435 | 914 | void java_resume(); |
duke@435 | 915 | int java_suspend_self(); |
duke@435 | 916 | |
duke@435 | 917 | void check_and_wait_while_suspended() { |
duke@435 | 918 | assert(JavaThread::current() == this, "sanity check"); |
duke@435 | 919 | |
duke@435 | 920 | bool do_self_suspend; |
duke@435 | 921 | do { |
duke@435 | 922 | // were we externally suspended while we were waiting? |
duke@435 | 923 | do_self_suspend = handle_special_suspend_equivalent_condition(); |
duke@435 | 924 | if (do_self_suspend) { |
duke@435 | 925 | // don't surprise the thread that suspended us by returning |
duke@435 | 926 | java_suspend_self(); |
duke@435 | 927 | set_suspend_equivalent(); |
duke@435 | 928 | } |
duke@435 | 929 | } while (do_self_suspend); |
duke@435 | 930 | } |
duke@435 | 931 | static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); |
duke@435 | 932 | // Check for async exception in addition to safepoint and suspend request. |
duke@435 | 933 | static void check_special_condition_for_native_trans(JavaThread *thread); |
duke@435 | 934 | |
duke@435 | 935 | bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); |
duke@435 | 936 | bool is_ext_suspend_completed_with_lock(uint32_t *bits) { |
duke@435 | 937 | MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
duke@435 | 938 | // Warning: is_ext_suspend_completed() may temporarily drop the |
duke@435 | 939 | // SR_lock to allow the thread to reach a stable thread state if |
duke@435 | 940 | // it is currently in a transient thread state. |
duke@435 | 941 | return is_ext_suspend_completed(false /*!called_by_wait */, |
duke@435 | 942 | SuspendRetryDelay, bits); |
duke@435 | 943 | } |
duke@435 | 944 | |
duke@435 | 945 | // We cannot allow wait_for_ext_suspend_completion() to run forever or |
duke@435 | 946 | // we could hang. SuspendRetryCount and SuspendRetryDelay are normally |
duke@435 | 947 | // passed as the count and delay parameters. Experiments with specific |
duke@435 | 948 | // calls to wait_for_ext_suspend_completion() can be done by passing |
duke@435 | 949 | // other values in the code. Experiments with all calls can be done |
duke@435 | 950 | // via the appropriate -XX options. |
duke@435 | 951 | bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); |
duke@435 | 952 | |
duke@435 | 953 | void set_external_suspend() { set_suspend_flag (_external_suspend); } |
duke@435 | 954 | void clear_external_suspend() { clear_suspend_flag(_external_suspend); } |
duke@435 | 955 | |
duke@435 | 956 | void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } |
duke@435 | 957 | void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } |
duke@435 | 958 | bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } |
duke@435 | 959 | |
duke@435 | 960 | bool is_external_suspend() const { |
duke@435 | 961 | return (_suspend_flags & _external_suspend) != 0; |
duke@435 | 962 | } |
duke@435 | 963 | // Whenever a thread transitions from native to vm/java it must suspend |
duke@435 | 964 | // if external|deopt suspend is present. |
duke@435 | 965 | bool is_suspend_after_native() const { |
duke@435 | 966 | return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; |
duke@435 | 967 | } |
duke@435 | 968 | |
duke@435 | 969 | // external suspend request is completed |
duke@435 | 970 | bool is_ext_suspended() const { |
duke@435 | 971 | return (_suspend_flags & _ext_suspended) != 0; |
duke@435 | 972 | } |
duke@435 | 973 | |
duke@435 | 974 | // legacy method that checked for either external suspension or vm suspension |
duke@435 | 975 | bool is_any_suspended() const { |
duke@435 | 976 | return is_ext_suspended(); |
duke@435 | 977 | } |
duke@435 | 978 | |
duke@435 | 979 | bool is_external_suspend_with_lock() const { |
duke@435 | 980 | MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
duke@435 | 981 | return is_external_suspend(); |
duke@435 | 982 | } |
duke@435 | 983 | |
duke@435 | 984 | // Special method to handle a pending external suspend request |
duke@435 | 985 | // when a suspend equivalent condition lifts. |
duke@435 | 986 | bool handle_special_suspend_equivalent_condition() { |
duke@435 | 987 | assert(is_suspend_equivalent(), |
duke@435 | 988 | "should only be called in a suspend equivalence condition"); |
duke@435 | 989 | MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
duke@435 | 990 | bool ret = is_external_suspend(); |
duke@435 | 991 | if (!ret) { |
duke@435 | 992 | // not about to self-suspend so clear suspend equivalence |
duke@435 | 993 | clear_suspend_equivalent(); |
duke@435 | 994 | } |
duke@435 | 995 | // implied else: |
duke@435 | 996 | // We have a pending external suspend request so we leave the |
duke@435 | 997 | // suspend_equivalent flag set until java_suspend_self() sets |
duke@435 | 998 | // the ext_suspended flag and clears the suspend_equivalent |
duke@435 | 999 | // flag. This insures that wait_for_ext_suspend_completion() |
duke@435 | 1000 | // will return consistent values. |
duke@435 | 1001 | return ret; |
duke@435 | 1002 | } |
duke@435 | 1003 | |
duke@435 | 1004 | bool is_any_suspended_with_lock() const { |
duke@435 | 1005 | MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
duke@435 | 1006 | return is_any_suspended(); |
duke@435 | 1007 | } |
duke@435 | 1008 | // utility methods to see if we are doing some kind of suspension |
duke@435 | 1009 | bool is_being_ext_suspended() const { |
duke@435 | 1010 | MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
duke@435 | 1011 | return is_ext_suspended() || is_external_suspend(); |
duke@435 | 1012 | } |
duke@435 | 1013 | |
duke@435 | 1014 | bool is_suspend_equivalent() const { return _suspend_equivalent; } |
duke@435 | 1015 | |
duke@435 | 1016 | void set_suspend_equivalent() { _suspend_equivalent = true; }; |
duke@435 | 1017 | void clear_suspend_equivalent() { _suspend_equivalent = false; }; |
duke@435 | 1018 | |
duke@435 | 1019 | // Thread.stop support |
duke@435 | 1020 | void send_thread_stop(oop throwable); |
duke@435 | 1021 | AsyncRequests clear_special_runtime_exit_condition() { |
duke@435 | 1022 | AsyncRequests x = _special_runtime_exit_condition; |
duke@435 | 1023 | _special_runtime_exit_condition = _no_async_condition; |
duke@435 | 1024 | return x; |
duke@435 | 1025 | } |
duke@435 | 1026 | |
duke@435 | 1027 | // Are any async conditions present? |
duke@435 | 1028 | bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } |
duke@435 | 1029 | |
duke@435 | 1030 | void check_and_handle_async_exceptions(bool check_unsafe_error = true); |
duke@435 | 1031 | |
duke@435 | 1032 | // these next two are also used for self-suspension and async exception support |
duke@435 | 1033 | void handle_special_runtime_exit_condition(bool check_asyncs = true); |
duke@435 | 1034 | |
duke@435 | 1035 | // Return true if JavaThread has an asynchronous condition or |
duke@435 | 1036 | // if external suspension is requested. |
duke@435 | 1037 | bool has_special_runtime_exit_condition() { |
duke@435 | 1038 | // We call is_external_suspend() last since external suspend should |
duke@435 | 1039 | // be less common. Because we don't use is_external_suspend_with_lock |
duke@435 | 1040 | // it is possible that we won't see an asynchronous external suspend |
duke@435 | 1041 | // request that has just gotten started, i.e., SR_lock grabbed but |
duke@435 | 1042 | // _external_suspend field change either not made yet or not visible |
duke@435 | 1043 | // yet. However, this is okay because the request is asynchronous and |
duke@435 | 1044 | // we will see the new flag value the next time through. It's also |
duke@435 | 1045 | // possible that the external suspend request is dropped after |
duke@435 | 1046 | // we have checked is_external_suspend(), we will recheck its value |
duke@435 | 1047 | // under SR_lock in java_suspend_self(). |
duke@435 | 1048 | return (_special_runtime_exit_condition != _no_async_condition) || |
duke@435 | 1049 | is_external_suspend() || is_deopt_suspend(); |
duke@435 | 1050 | } |
duke@435 | 1051 | |
duke@435 | 1052 | void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } |
duke@435 | 1053 | |
duke@435 | 1054 | void set_pending_async_exception(oop e) { |
duke@435 | 1055 | _pending_async_exception = e; |
duke@435 | 1056 | _special_runtime_exit_condition = _async_exception; |
duke@435 | 1057 | set_has_async_exception(); |
duke@435 | 1058 | } |
duke@435 | 1059 | |
duke@435 | 1060 | // Fast-locking support |
duke@435 | 1061 | bool is_lock_owned(address adr) const; |
duke@435 | 1062 | |
duke@435 | 1063 | // Accessors for vframe array top |
duke@435 | 1064 | // The linked list of vframe arrays are sorted on sp. This means when we |
duke@435 | 1065 | // unpack the head must contain the vframe array to unpack. |
duke@435 | 1066 | void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } |
duke@435 | 1067 | vframeArray* vframe_array_head() const { return _vframe_array_head; } |
duke@435 | 1068 | |
duke@435 | 1069 | // Side structure for defering update of java frame locals until deopt occurs |
duke@435 | 1070 | GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } |
duke@435 | 1071 | void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } |
duke@435 | 1072 | |
duke@435 | 1073 | // These only really exist to make debugging deopt problems simpler |
duke@435 | 1074 | |
duke@435 | 1075 | void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } |
duke@435 | 1076 | vframeArray* vframe_array_last() const { return _vframe_array_last; } |
duke@435 | 1077 | |
duke@435 | 1078 | // The special resourceMark used during deoptimization |
duke@435 | 1079 | |
duke@435 | 1080 | void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } |
duke@435 | 1081 | DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } |
duke@435 | 1082 | |
duke@435 | 1083 | intptr_t* must_deopt_id() { return _must_deopt_id; } |
duke@435 | 1084 | void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } |
duke@435 | 1085 | void clear_must_deopt_id() { _must_deopt_id = NULL; } |
duke@435 | 1086 | |
duke@435 | 1087 | methodOop callee_target() const { return _callee_target; } |
duke@435 | 1088 | void set_callee_target (methodOop x) { _callee_target = x; } |
duke@435 | 1089 | |
duke@435 | 1090 | // Oop results of vm runtime calls |
duke@435 | 1091 | oop vm_result() const { return _vm_result; } |
duke@435 | 1092 | void set_vm_result (oop x) { _vm_result = x; } |
duke@435 | 1093 | |
duke@435 | 1094 | oop vm_result_2() const { return _vm_result_2; } |
duke@435 | 1095 | void set_vm_result_2 (oop x) { _vm_result_2 = x; } |
duke@435 | 1096 | |
duke@435 | 1097 | // Exception handling for compiled methods |
duke@435 | 1098 | oop exception_oop() const { return _exception_oop; } |
duke@435 | 1099 | int exception_stack_size() const { return _exception_stack_size; } |
duke@435 | 1100 | address exception_pc() const { return _exception_pc; } |
duke@435 | 1101 | address exception_handler_pc() const { return _exception_handler_pc; } |
duke@435 | 1102 | |
duke@435 | 1103 | void set_exception_oop(oop o) { _exception_oop = o; } |
duke@435 | 1104 | void set_exception_pc(address a) { _exception_pc = a; } |
duke@435 | 1105 | void set_exception_handler_pc(address a) { _exception_handler_pc = a; } |
duke@435 | 1106 | void set_exception_stack_size(int size) { _exception_stack_size = size; } |
duke@435 | 1107 | |
duke@435 | 1108 | // Stack overflow support |
duke@435 | 1109 | inline size_t stack_available(address cur_sp); |
duke@435 | 1110 | address stack_yellow_zone_base() |
duke@435 | 1111 | { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } |
duke@435 | 1112 | size_t stack_yellow_zone_size() |
duke@435 | 1113 | { return StackYellowPages * os::vm_page_size(); } |
duke@435 | 1114 | address stack_red_zone_base() |
duke@435 | 1115 | { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } |
duke@435 | 1116 | size_t stack_red_zone_size() |
duke@435 | 1117 | { return StackRedPages * os::vm_page_size(); } |
duke@435 | 1118 | bool in_stack_yellow_zone(address a) |
duke@435 | 1119 | { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } |
duke@435 | 1120 | bool in_stack_red_zone(address a) |
duke@435 | 1121 | { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } |
duke@435 | 1122 | |
duke@435 | 1123 | void create_stack_guard_pages(); |
duke@435 | 1124 | void remove_stack_guard_pages(); |
duke@435 | 1125 | |
duke@435 | 1126 | void enable_stack_yellow_zone(); |
duke@435 | 1127 | void disable_stack_yellow_zone(); |
duke@435 | 1128 | void enable_stack_red_zone(); |
duke@435 | 1129 | void disable_stack_red_zone(); |
duke@435 | 1130 | |
duke@435 | 1131 | inline bool stack_yellow_zone_disabled(); |
duke@435 | 1132 | inline bool stack_yellow_zone_enabled(); |
duke@435 | 1133 | |
duke@435 | 1134 | // Attempt to reguard the stack after a stack overflow may have occurred. |
duke@435 | 1135 | // Returns true if (a) guard pages are not needed on this thread, (b) the |
duke@435 | 1136 | // pages are already guarded, or (c) the pages were successfully reguarded. |
duke@435 | 1137 | // Returns false if there is not enough stack space to reguard the pages, in |
duke@435 | 1138 | // which case the caller should unwind a frame and try again. The argument |
duke@435 | 1139 | // should be the caller's (approximate) sp. |
duke@435 | 1140 | bool reguard_stack(address cur_sp); |
duke@435 | 1141 | // Similar to above but see if current stackpoint is out of the guard area |
duke@435 | 1142 | // and reguard if possible. |
duke@435 | 1143 | bool reguard_stack(void); |
duke@435 | 1144 | |
duke@435 | 1145 | // Misc. accessors/mutators |
duke@435 | 1146 | void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } |
duke@435 | 1147 | void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } |
duke@435 | 1148 | bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } |
duke@435 | 1149 | |
duke@435 | 1150 | #ifndef PRODUCT |
duke@435 | 1151 | void record_jump(address target, address instr, const char* file, int line); |
duke@435 | 1152 | #endif /* PRODUCT */ |
duke@435 | 1153 | |
duke@435 | 1154 | // For assembly stub generation |
duke@435 | 1155 | static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } |
duke@435 | 1156 | #ifndef PRODUCT |
duke@435 | 1157 | static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } |
duke@435 | 1158 | static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } |
duke@435 | 1159 | #endif /* PRODUCT */ |
duke@435 | 1160 | static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } |
duke@435 | 1161 | static ByteSize last_Java_sp_offset() { |
duke@435 | 1162 | return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); |
duke@435 | 1163 | } |
duke@435 | 1164 | static ByteSize last_Java_pc_offset() { |
duke@435 | 1165 | return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); |
duke@435 | 1166 | } |
duke@435 | 1167 | static ByteSize frame_anchor_offset() { |
duke@435 | 1168 | return byte_offset_of(JavaThread, _anchor); |
duke@435 | 1169 | } |
duke@435 | 1170 | static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } |
duke@435 | 1171 | static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } |
duke@435 | 1172 | static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } |
duke@435 | 1173 | static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } |
duke@435 | 1174 | static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } |
duke@435 | 1175 | static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } |
duke@435 | 1176 | static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } |
duke@435 | 1177 | static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } |
duke@435 | 1178 | static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } |
duke@435 | 1179 | static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); } |
duke@435 | 1180 | static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
duke@435 | 1181 | static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } |
duke@435 | 1182 | |
duke@435 | 1183 | static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } |
duke@435 | 1184 | |
ysr@777 | 1185 | #ifndef SERIALGC |
ysr@777 | 1186 | static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } |
ysr@777 | 1187 | static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } |
ysr@777 | 1188 | #endif // !SERIALGC |
ysr@777 | 1189 | |
duke@435 | 1190 | // Returns the jni environment for this thread |
duke@435 | 1191 | JNIEnv* jni_environment() { return &_jni_environment; } |
duke@435 | 1192 | |
duke@435 | 1193 | static JavaThread* thread_from_jni_environment(JNIEnv* env) { |
duke@435 | 1194 | JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); |
duke@435 | 1195 | // Only return NULL if thread is off the thread list; starting to |
duke@435 | 1196 | // exit should not return NULL. |
duke@435 | 1197 | if (thread_from_jni_env->is_terminated()) { |
duke@435 | 1198 | thread_from_jni_env->block_if_vm_exited(); |
duke@435 | 1199 | return NULL; |
duke@435 | 1200 | } else { |
duke@435 | 1201 | return thread_from_jni_env; |
duke@435 | 1202 | } |
duke@435 | 1203 | } |
duke@435 | 1204 | |
duke@435 | 1205 | // JNI critical regions. These can nest. |
duke@435 | 1206 | bool in_critical() { return _jni_active_critical > 0; } |
duke@435 | 1207 | void enter_critical() { assert(Thread::current() == this, |
duke@435 | 1208 | "this must be current thread"); |
duke@435 | 1209 | _jni_active_critical++; } |
duke@435 | 1210 | void exit_critical() { assert(Thread::current() == this, |
duke@435 | 1211 | "this must be current thread"); |
duke@435 | 1212 | _jni_active_critical--; |
duke@435 | 1213 | assert(_jni_active_critical >= 0, |
duke@435 | 1214 | "JNI critical nesting problem?"); } |
duke@435 | 1215 | |
duke@435 | 1216 | // For deadlock detection |
duke@435 | 1217 | int depth_first_number() { return _depth_first_number; } |
duke@435 | 1218 | void set_depth_first_number(int dfn) { _depth_first_number = dfn; } |
duke@435 | 1219 | |
duke@435 | 1220 | private: |
duke@435 | 1221 | void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } |
duke@435 | 1222 | |
duke@435 | 1223 | public: |
duke@435 | 1224 | MonitorChunk* monitor_chunks() const { return _monitor_chunks; } |
duke@435 | 1225 | void add_monitor_chunk(MonitorChunk* chunk); |
duke@435 | 1226 | void remove_monitor_chunk(MonitorChunk* chunk); |
duke@435 | 1227 | bool in_deopt_handler() const { return _in_deopt_handler > 0; } |
duke@435 | 1228 | void inc_in_deopt_handler() { _in_deopt_handler++; } |
duke@435 | 1229 | void dec_in_deopt_handler() { |
duke@435 | 1230 | assert(_in_deopt_handler > 0, "mismatched deopt nesting"); |
duke@435 | 1231 | if (_in_deopt_handler > 0) { // robustness |
duke@435 | 1232 | _in_deopt_handler--; |
duke@435 | 1233 | } |
duke@435 | 1234 | } |
duke@435 | 1235 | |
duke@435 | 1236 | private: |
duke@435 | 1237 | void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } |
duke@435 | 1238 | |
duke@435 | 1239 | public: |
duke@435 | 1240 | |
duke@435 | 1241 | // Frame iteration; calls the function f for all frames on the stack |
duke@435 | 1242 | void frames_do(void f(frame*, const RegisterMap*)); |
duke@435 | 1243 | |
duke@435 | 1244 | // Memory operations |
duke@435 | 1245 | void oops_do(OopClosure* f); |
duke@435 | 1246 | |
duke@435 | 1247 | // Sweeper operations |
duke@435 | 1248 | void nmethods_do(); |
duke@435 | 1249 | |
duke@435 | 1250 | // Memory management operations |
duke@435 | 1251 | void gc_epilogue(); |
duke@435 | 1252 | void gc_prologue(); |
duke@435 | 1253 | |
duke@435 | 1254 | // Misc. operations |
duke@435 | 1255 | char* name() const { return (char*)get_thread_name(); } |
duke@435 | 1256 | void print_on(outputStream* st) const; |
duke@435 | 1257 | void print() const { print_on(tty); } |
duke@435 | 1258 | void print_value(); |
duke@435 | 1259 | void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; |
duke@435 | 1260 | void print_thread_state() const PRODUCT_RETURN; |
duke@435 | 1261 | void print_on_error(outputStream* st, char* buf, int buflen) const; |
duke@435 | 1262 | void verify(); |
duke@435 | 1263 | const char* get_thread_name() const; |
duke@435 | 1264 | private: |
duke@435 | 1265 | // factor out low-level mechanics for use in both normal and error cases |
duke@435 | 1266 | const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; |
duke@435 | 1267 | public: |
duke@435 | 1268 | const char* get_threadgroup_name() const; |
duke@435 | 1269 | const char* get_parent_name() const; |
duke@435 | 1270 | |
duke@435 | 1271 | // Accessing frames |
duke@435 | 1272 | frame last_frame() { |
duke@435 | 1273 | _anchor.make_walkable(this); |
duke@435 | 1274 | return pd_last_frame(); |
duke@435 | 1275 | } |
duke@435 | 1276 | javaVFrame* last_java_vframe(RegisterMap* reg_map); |
duke@435 | 1277 | |
duke@435 | 1278 | // Returns method at 'depth' java or native frames down the stack |
duke@435 | 1279 | // Used for security checks |
duke@435 | 1280 | klassOop security_get_caller_class(int depth); |
duke@435 | 1281 | |
duke@435 | 1282 | // Print stack trace in external format |
duke@435 | 1283 | void print_stack_on(outputStream* st); |
duke@435 | 1284 | void print_stack() { print_stack_on(tty); } |
duke@435 | 1285 | |
duke@435 | 1286 | // Print stack traces in various internal formats |
duke@435 | 1287 | void trace_stack() PRODUCT_RETURN; |
duke@435 | 1288 | void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; |
duke@435 | 1289 | void trace_frames() PRODUCT_RETURN; |
duke@435 | 1290 | |
duke@435 | 1291 | // Returns the number of stack frames on the stack |
duke@435 | 1292 | int depth() const; |
duke@435 | 1293 | |
duke@435 | 1294 | // Function for testing deoptimization |
duke@435 | 1295 | void deoptimize(); |
duke@435 | 1296 | void make_zombies(); |
duke@435 | 1297 | |
duke@435 | 1298 | void deoptimized_wrt_marked_nmethods(); |
duke@435 | 1299 | |
duke@435 | 1300 | // Profiling operation (see fprofile.cpp) |
duke@435 | 1301 | public: |
duke@435 | 1302 | bool profile_last_Java_frame(frame* fr); |
duke@435 | 1303 | |
duke@435 | 1304 | private: |
duke@435 | 1305 | ThreadProfiler* _thread_profiler; |
duke@435 | 1306 | private: |
duke@435 | 1307 | friend class FlatProfiler; // uses both [gs]et_thread_profiler. |
duke@435 | 1308 | friend class FlatProfilerTask; // uses get_thread_profiler. |
duke@435 | 1309 | friend class ThreadProfilerMark; // uses get_thread_profiler. |
duke@435 | 1310 | ThreadProfiler* get_thread_profiler() { return _thread_profiler; } |
duke@435 | 1311 | ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { |
duke@435 | 1312 | ThreadProfiler* result = _thread_profiler; |
duke@435 | 1313 | _thread_profiler = tp; |
duke@435 | 1314 | return result; |
duke@435 | 1315 | } |
duke@435 | 1316 | |
duke@435 | 1317 | // Static operations |
duke@435 | 1318 | public: |
duke@435 | 1319 | // Returns the running thread as a JavaThread |
duke@435 | 1320 | static inline JavaThread* current(); |
duke@435 | 1321 | |
duke@435 | 1322 | // Returns the active Java thread. Do not use this if you know you are calling |
duke@435 | 1323 | // from a JavaThread, as it's slower than JavaThread::current. If called from |
duke@435 | 1324 | // the VMThread, it also returns the JavaThread that instigated the VMThread's |
duke@435 | 1325 | // operation. You may not want that either. |
duke@435 | 1326 | static JavaThread* active(); |
duke@435 | 1327 | |
duke@435 | 1328 | inline CompilerThread* as_CompilerThread(); |
duke@435 | 1329 | |
duke@435 | 1330 | public: |
duke@435 | 1331 | virtual void run(); |
duke@435 | 1332 | void thread_main_inner(); |
duke@435 | 1333 | |
duke@435 | 1334 | private: |
duke@435 | 1335 | // PRIVILEGED STACK |
duke@435 | 1336 | PrivilegedElement* _privileged_stack_top; |
duke@435 | 1337 | GrowableArray<oop>* _array_for_gc; |
duke@435 | 1338 | public: |
duke@435 | 1339 | |
duke@435 | 1340 | // Returns the privileged_stack information. |
duke@435 | 1341 | PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } |
duke@435 | 1342 | void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } |
duke@435 | 1343 | void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } |
duke@435 | 1344 | |
duke@435 | 1345 | public: |
duke@435 | 1346 | // Thread local information maintained by JVMTI. |
duke@435 | 1347 | void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } |
dcubed@1044 | 1348 | // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
dcubed@1044 | 1349 | // getter is used to get this JavaThread's JvmtiThreadState if it has |
dcubed@1044 | 1350 | // one which means NULL can be returned. JvmtiThreadState::state_for() |
dcubed@1044 | 1351 | // is used to get the specified JavaThread's JvmtiThreadState if it has |
dcubed@1044 | 1352 | // one or it allocates a new JvmtiThreadState for the JavaThread and |
dcubed@1044 | 1353 | // returns it. JvmtiThreadState::state_for() will return NULL only if |
dcubed@1044 | 1354 | // the specified JavaThread is exiting. |
duke@435 | 1355 | JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
duke@435 | 1356 | static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } |
duke@435 | 1357 | void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } |
duke@435 | 1358 | JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } |
duke@435 | 1359 | |
duke@435 | 1360 | // JVMTI PopFrame support |
duke@435 | 1361 | // Setting and clearing popframe_condition |
duke@435 | 1362 | // All of these enumerated values are bits. popframe_pending |
duke@435 | 1363 | // indicates that a PopFrame() has been requested and not yet been |
duke@435 | 1364 | // completed. popframe_processing indicates that that PopFrame() is in |
duke@435 | 1365 | // the process of being completed. popframe_force_deopt_reexecution_bit |
duke@435 | 1366 | // indicates that special handling is required when returning to a |
duke@435 | 1367 | // deoptimized caller. |
duke@435 | 1368 | enum PopCondition { |
duke@435 | 1369 | popframe_inactive = 0x00, |
duke@435 | 1370 | popframe_pending_bit = 0x01, |
duke@435 | 1371 | popframe_processing_bit = 0x02, |
duke@435 | 1372 | popframe_force_deopt_reexecution_bit = 0x04 |
duke@435 | 1373 | }; |
duke@435 | 1374 | PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } |
duke@435 | 1375 | void set_popframe_condition(PopCondition c) { _popframe_condition = c; } |
duke@435 | 1376 | void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } |
duke@435 | 1377 | void clear_popframe_condition() { _popframe_condition = popframe_inactive; } |
duke@435 | 1378 | static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } |
duke@435 | 1379 | bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } |
duke@435 | 1380 | bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } |
duke@435 | 1381 | void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } |
duke@435 | 1382 | #ifdef CC_INTERP |
duke@435 | 1383 | bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } |
duke@435 | 1384 | void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } |
duke@435 | 1385 | bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } |
duke@435 | 1386 | void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } |
duke@435 | 1387 | void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } |
duke@435 | 1388 | #endif |
duke@435 | 1389 | |
duke@435 | 1390 | private: |
duke@435 | 1391 | // Saved incoming arguments to popped frame. |
duke@435 | 1392 | // Used only when popped interpreted frame returns to deoptimized frame. |
duke@435 | 1393 | void* _popframe_preserved_args; |
duke@435 | 1394 | int _popframe_preserved_args_size; |
duke@435 | 1395 | |
duke@435 | 1396 | public: |
duke@435 | 1397 | void popframe_preserve_args(ByteSize size_in_bytes, void* start); |
duke@435 | 1398 | void* popframe_preserved_args(); |
duke@435 | 1399 | ByteSize popframe_preserved_args_size(); |
duke@435 | 1400 | WordSize popframe_preserved_args_size_in_words(); |
duke@435 | 1401 | void popframe_free_preserved_args(); |
duke@435 | 1402 | |
duke@435 | 1403 | |
duke@435 | 1404 | private: |
duke@435 | 1405 | JvmtiThreadState *_jvmti_thread_state; |
duke@435 | 1406 | JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; |
duke@435 | 1407 | |
duke@435 | 1408 | // Used by the interpreter in fullspeed mode for frame pop, method |
duke@435 | 1409 | // entry, method exit and single stepping support. This field is |
duke@435 | 1410 | // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. |
duke@435 | 1411 | // It can be set to zero asynchronously (i.e., without a VM operation |
duke@435 | 1412 | // or a lock) so we have to be very careful. |
duke@435 | 1413 | int _interp_only_mode; |
duke@435 | 1414 | |
duke@435 | 1415 | public: |
duke@435 | 1416 | // used by the interpreter for fullspeed debugging support (see above) |
duke@435 | 1417 | static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } |
duke@435 | 1418 | bool is_interp_only_mode() { return (_interp_only_mode != 0); } |
duke@435 | 1419 | int get_interp_only_mode() { return _interp_only_mode; } |
duke@435 | 1420 | void increment_interp_only_mode() { ++_interp_only_mode; } |
duke@435 | 1421 | void decrement_interp_only_mode() { --_interp_only_mode; } |
duke@435 | 1422 | |
duke@435 | 1423 | private: |
duke@435 | 1424 | ThreadStatistics *_thread_stat; |
duke@435 | 1425 | |
duke@435 | 1426 | public: |
duke@435 | 1427 | ThreadStatistics* get_thread_stat() const { return _thread_stat; } |
duke@435 | 1428 | |
duke@435 | 1429 | // Return a blocker object for which this thread is blocked parking. |
duke@435 | 1430 | oop current_park_blocker(); |
duke@435 | 1431 | |
duke@435 | 1432 | private: |
duke@435 | 1433 | static size_t _stack_size_at_create; |
duke@435 | 1434 | |
duke@435 | 1435 | public: |
duke@435 | 1436 | static inline size_t stack_size_at_create(void) { |
duke@435 | 1437 | return _stack_size_at_create; |
duke@435 | 1438 | } |
duke@435 | 1439 | static inline void set_stack_size_at_create(size_t value) { |
duke@435 | 1440 | _stack_size_at_create = value; |
duke@435 | 1441 | } |
duke@435 | 1442 | |
ysr@777 | 1443 | #ifndef SERIALGC |
ysr@777 | 1444 | // SATB marking queue support |
ysr@777 | 1445 | ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } |
ysr@777 | 1446 | static SATBMarkQueueSet& satb_mark_queue_set() { |
ysr@777 | 1447 | return _satb_mark_queue_set; |
ysr@777 | 1448 | } |
ysr@777 | 1449 | |
ysr@777 | 1450 | // Dirty card queue support |
ysr@777 | 1451 | DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } |
ysr@777 | 1452 | static DirtyCardQueueSet& dirty_card_queue_set() { |
ysr@777 | 1453 | return _dirty_card_queue_set; |
ysr@777 | 1454 | } |
ysr@777 | 1455 | #endif // !SERIALGC |
ysr@777 | 1456 | |
duke@435 | 1457 | // Machine dependent stuff |
duke@435 | 1458 | #include "incls/_thread_pd.hpp.incl" |
duke@435 | 1459 | |
duke@435 | 1460 | public: |
duke@435 | 1461 | void set_blocked_on_compilation(bool value) { |
duke@435 | 1462 | _blocked_on_compilation = value; |
duke@435 | 1463 | } |
duke@435 | 1464 | |
duke@435 | 1465 | bool blocked_on_compilation() { |
duke@435 | 1466 | return _blocked_on_compilation; |
duke@435 | 1467 | } |
duke@435 | 1468 | protected: |
duke@435 | 1469 | bool _blocked_on_compilation; |
duke@435 | 1470 | |
duke@435 | 1471 | |
duke@435 | 1472 | // JSR166 per-thread parker |
duke@435 | 1473 | private: |
duke@435 | 1474 | Parker* _parker; |
duke@435 | 1475 | public: |
duke@435 | 1476 | Parker* parker() { return _parker; } |
duke@435 | 1477 | |
duke@435 | 1478 | // Biased locking support |
duke@435 | 1479 | private: |
duke@435 | 1480 | GrowableArray<MonitorInfo*>* _cached_monitor_info; |
duke@435 | 1481 | public: |
duke@435 | 1482 | GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } |
duke@435 | 1483 | void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } |
duke@435 | 1484 | |
duke@435 | 1485 | // clearing/querying jni attach status |
duke@435 | 1486 | bool is_attaching() const { return _is_attaching; } |
duke@435 | 1487 | void set_attached() { _is_attaching = false; OrderAccess::fence(); } |
ysr@777 | 1488 | private: |
ysr@777 | 1489 | // This field is used to determine if a thread has claimed |
ysr@777 | 1490 | // a par_id: it is -1 if the thread has not claimed a par_id; |
ysr@777 | 1491 | // otherwise its value is the par_id that has been claimed. |
ysr@777 | 1492 | int _claimed_par_id; |
ysr@777 | 1493 | public: |
ysr@777 | 1494 | int get_claimed_par_id() { return _claimed_par_id; } |
ysr@777 | 1495 | void set_claimed_par_id(int id) { _claimed_par_id = id;} |
duke@435 | 1496 | }; |
duke@435 | 1497 | |
duke@435 | 1498 | // Inline implementation of JavaThread::current |
duke@435 | 1499 | inline JavaThread* JavaThread::current() { |
duke@435 | 1500 | Thread* thread = ThreadLocalStorage::thread(); |
duke@435 | 1501 | assert(thread != NULL && thread->is_Java_thread(), "just checking"); |
duke@435 | 1502 | return (JavaThread*)thread; |
duke@435 | 1503 | } |
duke@435 | 1504 | |
duke@435 | 1505 | inline CompilerThread* JavaThread::as_CompilerThread() { |
duke@435 | 1506 | assert(is_Compiler_thread(), "just checking"); |
duke@435 | 1507 | return (CompilerThread*)this; |
duke@435 | 1508 | } |
duke@435 | 1509 | |
duke@435 | 1510 | inline bool JavaThread::stack_yellow_zone_disabled() { |
duke@435 | 1511 | return _stack_guard_state == stack_guard_yellow_disabled; |
duke@435 | 1512 | } |
duke@435 | 1513 | |
duke@435 | 1514 | inline bool JavaThread::stack_yellow_zone_enabled() { |
duke@435 | 1515 | #ifdef ASSERT |
duke@435 | 1516 | if (os::uses_stack_guard_pages()) { |
duke@435 | 1517 | assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); |
duke@435 | 1518 | } |
duke@435 | 1519 | #endif |
duke@435 | 1520 | return _stack_guard_state == stack_guard_enabled; |
duke@435 | 1521 | } |
duke@435 | 1522 | |
duke@435 | 1523 | inline size_t JavaThread::stack_available(address cur_sp) { |
duke@435 | 1524 | // This code assumes java stacks grow down |
duke@435 | 1525 | address low_addr; // Limit on the address for deepest stack depth |
duke@435 | 1526 | if ( _stack_guard_state == stack_guard_unused) { |
duke@435 | 1527 | low_addr = stack_base() - stack_size(); |
duke@435 | 1528 | } else { |
duke@435 | 1529 | low_addr = stack_yellow_zone_base(); |
duke@435 | 1530 | } |
duke@435 | 1531 | return cur_sp > low_addr ? cur_sp - low_addr : 0; |
duke@435 | 1532 | } |
duke@435 | 1533 | |
duke@435 | 1534 | // A JavaThread for low memory detection support |
duke@435 | 1535 | class LowMemoryDetectorThread : public JavaThread { |
duke@435 | 1536 | friend class VMStructs; |
duke@435 | 1537 | public: |
duke@435 | 1538 | LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; |
duke@435 | 1539 | |
duke@435 | 1540 | // Hide this thread from external view. |
duke@435 | 1541 | bool is_hidden_from_external_view() const { return true; } |
duke@435 | 1542 | }; |
duke@435 | 1543 | |
duke@435 | 1544 | // A thread used for Compilation. |
duke@435 | 1545 | class CompilerThread : public JavaThread { |
duke@435 | 1546 | friend class VMStructs; |
duke@435 | 1547 | private: |
duke@435 | 1548 | CompilerCounters* _counters; |
duke@435 | 1549 | |
duke@435 | 1550 | ciEnv* _env; |
duke@435 | 1551 | CompileLog* _log; |
duke@435 | 1552 | CompileTask* _task; |
duke@435 | 1553 | CompileQueue* _queue; |
duke@435 | 1554 | |
duke@435 | 1555 | public: |
duke@435 | 1556 | |
duke@435 | 1557 | static CompilerThread* current(); |
duke@435 | 1558 | |
duke@435 | 1559 | CompilerThread(CompileQueue* queue, CompilerCounters* counters); |
duke@435 | 1560 | |
duke@435 | 1561 | bool is_Compiler_thread() const { return true; } |
duke@435 | 1562 | // Hide this compiler thread from external view. |
duke@435 | 1563 | bool is_hidden_from_external_view() const { return true; } |
duke@435 | 1564 | |
duke@435 | 1565 | CompileQueue* queue() { return _queue; } |
duke@435 | 1566 | CompilerCounters* counters() { return _counters; } |
duke@435 | 1567 | |
duke@435 | 1568 | // Get/set the thread's compilation environment. |
duke@435 | 1569 | ciEnv* env() { return _env; } |
duke@435 | 1570 | void set_env(ciEnv* env) { _env = env; } |
duke@435 | 1571 | |
duke@435 | 1572 | // Get/set the thread's logging information |
duke@435 | 1573 | CompileLog* log() { return _log; } |
duke@435 | 1574 | void init_log(CompileLog* log) { |
duke@435 | 1575 | // Set once, for good. |
duke@435 | 1576 | assert(_log == NULL, "set only once"); |
duke@435 | 1577 | _log = log; |
duke@435 | 1578 | } |
duke@435 | 1579 | |
duke@435 | 1580 | #ifndef PRODUCT |
duke@435 | 1581 | private: |
duke@435 | 1582 | IdealGraphPrinter *_ideal_graph_printer; |
duke@435 | 1583 | public: |
duke@435 | 1584 | IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } |
duke@435 | 1585 | void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } |
duke@435 | 1586 | #endif |
duke@435 | 1587 | |
duke@435 | 1588 | // Get/set the thread's current task |
duke@435 | 1589 | CompileTask* task() { return _task; } |
duke@435 | 1590 | void set_task(CompileTask* task) { _task = task; } |
duke@435 | 1591 | }; |
duke@435 | 1592 | |
duke@435 | 1593 | inline CompilerThread* CompilerThread::current() { |
duke@435 | 1594 | return JavaThread::current()->as_CompilerThread(); |
duke@435 | 1595 | } |
duke@435 | 1596 | |
duke@435 | 1597 | |
duke@435 | 1598 | // The active thread queue. It also keeps track of the current used |
duke@435 | 1599 | // thread priorities. |
duke@435 | 1600 | class Threads: AllStatic { |
duke@435 | 1601 | friend class VMStructs; |
duke@435 | 1602 | private: |
duke@435 | 1603 | static JavaThread* _thread_list; |
duke@435 | 1604 | static int _number_of_threads; |
duke@435 | 1605 | static int _number_of_non_daemon_threads; |
duke@435 | 1606 | static int _return_code; |
duke@435 | 1607 | |
duke@435 | 1608 | public: |
duke@435 | 1609 | // Thread management |
duke@435 | 1610 | // force_daemon is a concession to JNI, where we may need to add a |
duke@435 | 1611 | // thread to the thread list before allocating its thread object |
duke@435 | 1612 | static void add(JavaThread* p, bool force_daemon = false); |
duke@435 | 1613 | static void remove(JavaThread* p); |
duke@435 | 1614 | static bool includes(JavaThread* p); |
duke@435 | 1615 | static JavaThread* first() { return _thread_list; } |
duke@435 | 1616 | static void threads_do(ThreadClosure* tc); |
duke@435 | 1617 | |
duke@435 | 1618 | // Initializes the vm and creates the vm thread |
duke@435 | 1619 | static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); |
duke@435 | 1620 | static void convert_vm_init_libraries_to_agents(); |
duke@435 | 1621 | static void create_vm_init_libraries(); |
duke@435 | 1622 | static void create_vm_init_agents(); |
duke@435 | 1623 | static void shutdown_vm_agents(); |
duke@435 | 1624 | static bool destroy_vm(); |
duke@435 | 1625 | // Supported VM versions via JNI |
duke@435 | 1626 | // Includes JNI_VERSION_1_1 |
duke@435 | 1627 | static jboolean is_supported_jni_version_including_1_1(jint version); |
duke@435 | 1628 | // Does not include JNI_VERSION_1_1 |
duke@435 | 1629 | static jboolean is_supported_jni_version(jint version); |
duke@435 | 1630 | |
duke@435 | 1631 | // Garbage collection |
duke@435 | 1632 | static void follow_other_roots(void f(oop*)); |
duke@435 | 1633 | |
duke@435 | 1634 | // Apply "f->do_oop" to all root oops in all threads. |
duke@435 | 1635 | // This version may only be called by sequential code. |
duke@435 | 1636 | static void oops_do(OopClosure* f); |
duke@435 | 1637 | // This version may be called by sequential or parallel code. |
duke@435 | 1638 | static void possibly_parallel_oops_do(OopClosure* f); |
duke@435 | 1639 | // This creates a list of GCTasks, one per thread. |
duke@435 | 1640 | static void create_thread_roots_tasks(GCTaskQueue* q); |
duke@435 | 1641 | // This creates a list of GCTasks, one per thread, for marking objects. |
duke@435 | 1642 | static void create_thread_roots_marking_tasks(GCTaskQueue* q); |
duke@435 | 1643 | |
duke@435 | 1644 | // Apply "f->do_oop" to roots in all threads that |
duke@435 | 1645 | // are part of compiled frames |
duke@435 | 1646 | static void compiled_frame_oops_do(OopClosure* f); |
duke@435 | 1647 | |
duke@435 | 1648 | static void convert_hcode_pointers(); |
duke@435 | 1649 | static void restore_hcode_pointers(); |
duke@435 | 1650 | |
duke@435 | 1651 | // Sweeper |
duke@435 | 1652 | static void nmethods_do(); |
duke@435 | 1653 | |
duke@435 | 1654 | static void gc_epilogue(); |
duke@435 | 1655 | static void gc_prologue(); |
duke@435 | 1656 | |
duke@435 | 1657 | // Verification |
duke@435 | 1658 | static void verify(); |
duke@435 | 1659 | static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); |
duke@435 | 1660 | static void print(bool print_stacks, bool internal_format) { |
duke@435 | 1661 | // this function is only used by debug.cpp |
duke@435 | 1662 | print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); |
duke@435 | 1663 | } |
duke@435 | 1664 | static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); |
duke@435 | 1665 | |
duke@435 | 1666 | // Get Java threads that are waiting to enter a monitor. If doLock |
duke@435 | 1667 | // is true, then Threads_lock is grabbed as needed. Otherwise, the |
duke@435 | 1668 | // VM needs to be at a safepoint. |
duke@435 | 1669 | static GrowableArray<JavaThread*>* get_pending_threads(int count, |
duke@435 | 1670 | address monitor, bool doLock); |
duke@435 | 1671 | |
duke@435 | 1672 | // Get owning Java thread from the monitor's owner field. If doLock |
duke@435 | 1673 | // is true, then Threads_lock is grabbed as needed. Otherwise, the |
duke@435 | 1674 | // VM needs to be at a safepoint. |
duke@435 | 1675 | static JavaThread *owning_thread_from_monitor_owner(address owner, |
duke@435 | 1676 | bool doLock); |
duke@435 | 1677 | |
duke@435 | 1678 | // Number of threads on the active threads list |
duke@435 | 1679 | static int number_of_threads() { return _number_of_threads; } |
duke@435 | 1680 | // Number of non-daemon threads on the active threads list |
duke@435 | 1681 | static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } |
duke@435 | 1682 | |
duke@435 | 1683 | // Deoptimizes all frames tied to marked nmethods |
duke@435 | 1684 | static void deoptimized_wrt_marked_nmethods(); |
duke@435 | 1685 | |
duke@435 | 1686 | }; |
duke@435 | 1687 | |
duke@435 | 1688 | |
duke@435 | 1689 | // Thread iterator |
duke@435 | 1690 | class ThreadClosure: public StackObj { |
duke@435 | 1691 | public: |
duke@435 | 1692 | virtual void do_thread(Thread* thread) = 0; |
duke@435 | 1693 | }; |
duke@435 | 1694 | |
duke@435 | 1695 | class SignalHandlerMark: public StackObj { |
duke@435 | 1696 | private: |
duke@435 | 1697 | Thread* _thread; |
duke@435 | 1698 | public: |
duke@435 | 1699 | SignalHandlerMark(Thread* t) { |
duke@435 | 1700 | _thread = t; |
duke@435 | 1701 | if (_thread) _thread->enter_signal_handler(); |
duke@435 | 1702 | } |
duke@435 | 1703 | ~SignalHandlerMark() { |
duke@435 | 1704 | if (_thread) _thread->leave_signal_handler(); |
duke@435 | 1705 | _thread = NULL; |
duke@435 | 1706 | } |
duke@435 | 1707 | }; |
duke@435 | 1708 | |
duke@435 | 1709 | // ParkEvents are type-stable and immortal. |
duke@435 | 1710 | // |
duke@435 | 1711 | // Lifecycle: Once a ParkEvent is associated with a thread that ParkEvent remains |
duke@435 | 1712 | // associated with the thread for the thread's entire lifetime - the relationship is |
duke@435 | 1713 | // stable. A thread will be associated at most one ParkEvent. When the thread |
duke@435 | 1714 | // expires, the ParkEvent moves to the EventFreeList. New threads attempt to allocate from |
duke@435 | 1715 | // the EventFreeList before creating a new Event. Type-stability frees us from |
duke@435 | 1716 | // worrying about stale Event or Thread references in the objectMonitor subsystem. |
duke@435 | 1717 | // (A reference to ParkEvent is always valid, even though the event may no longer be associated |
duke@435 | 1718 | // with the desired or expected thread. A key aspect of this design is that the callers of |
duke@435 | 1719 | // park, unpark, etc must tolerate stale references and spurious wakeups). |
duke@435 | 1720 | // |
duke@435 | 1721 | // Only the "associated" thread can block (park) on the ParkEvent, although |
duke@435 | 1722 | // any other thread can unpark a reachable parkevent. Park() is allowed to |
duke@435 | 1723 | // return spuriously. In fact park-unpark a really just an optimization to |
duke@435 | 1724 | // avoid unbounded spinning and surrender the CPU to be a polite system citizen. |
duke@435 | 1725 | // A degenerate albeit "impolite" park-unpark implementation could simply return. |
duke@435 | 1726 | // See http://blogs.sun.com/dave for more details. |
duke@435 | 1727 | // |
duke@435 | 1728 | // Eventually I'd like to eliminate Events and ObjectWaiters, both of which serve as |
duke@435 | 1729 | // thread proxies, and simply make the THREAD structure type-stable and persistent. |
duke@435 | 1730 | // Currently, we unpark events associated with threads, but ideally we'd just |
duke@435 | 1731 | // unpark threads. |
duke@435 | 1732 | // |
duke@435 | 1733 | // The base-class, PlatformEvent, is platform-specific while the ParkEvent is |
duke@435 | 1734 | // platform-independent. PlatformEvent provides park(), unpark(), etc., and |
duke@435 | 1735 | // is abstract -- that is, a PlatformEvent should never be instantiated except |
duke@435 | 1736 | // as part of a ParkEvent. |
duke@435 | 1737 | // Equivalently we could have defined a platform-independent base-class that |
duke@435 | 1738 | // exported Allocate(), Release(), etc. The platform-specific class would extend |
duke@435 | 1739 | // that base-class, adding park(), unpark(), etc. |
duke@435 | 1740 | // |
duke@435 | 1741 | // A word of caution: The JVM uses 2 very similar constructs: |
duke@435 | 1742 | // 1. ParkEvent are used for Java-level "monitor" synchronization. |
duke@435 | 1743 | // 2. Parkers are used by JSR166-JUC park-unpark. |
duke@435 | 1744 | // |
duke@435 | 1745 | // We'll want to eventually merge these redundant facilities and use ParkEvent. |
duke@435 | 1746 | |
duke@435 | 1747 | |
duke@435 | 1748 | class ParkEvent : public os::PlatformEvent { |
duke@435 | 1749 | private: |
duke@435 | 1750 | ParkEvent * FreeNext ; |
duke@435 | 1751 | |
duke@435 | 1752 | // Current association |
duke@435 | 1753 | Thread * AssociatedWith ; |
duke@435 | 1754 | intptr_t RawThreadIdentity ; // LWPID etc |
duke@435 | 1755 | volatile int Incarnation ; |
duke@435 | 1756 | |
duke@435 | 1757 | // diagnostic : keep track of last thread to wake this thread. |
duke@435 | 1758 | // this is useful for construction of dependency graphs. |
duke@435 | 1759 | void * LastWaker ; |
duke@435 | 1760 | |
duke@435 | 1761 | public: |
duke@435 | 1762 | // MCS-CLH list linkage and Native Mutex/Monitor |
duke@435 | 1763 | ParkEvent * volatile ListNext ; |
duke@435 | 1764 | ParkEvent * volatile ListPrev ; |
duke@435 | 1765 | volatile intptr_t OnList ; |
duke@435 | 1766 | volatile int TState ; |
duke@435 | 1767 | volatile int Notified ; // for native monitor construct |
duke@435 | 1768 | volatile int IsWaiting ; // Enqueued on WaitSet |
duke@435 | 1769 | |
duke@435 | 1770 | |
duke@435 | 1771 | private: |
duke@435 | 1772 | static ParkEvent * volatile FreeList ; |
duke@435 | 1773 | static volatile int ListLock ; |
duke@435 | 1774 | |
duke@435 | 1775 | // It's prudent to mark the dtor as "private" |
duke@435 | 1776 | // ensuring that it's not visible outside the package. |
duke@435 | 1777 | // Unfortunately gcc warns about such usage, so |
duke@435 | 1778 | // we revert to the less desirable "protected" visibility. |
duke@435 | 1779 | // The other compilers accept private dtors. |
duke@435 | 1780 | |
duke@435 | 1781 | protected: // Ensure dtor is never invoked |
duke@435 | 1782 | ~ParkEvent() { guarantee (0, "invariant") ; } |
duke@435 | 1783 | |
duke@435 | 1784 | ParkEvent() : PlatformEvent() { |
duke@435 | 1785 | AssociatedWith = NULL ; |
duke@435 | 1786 | FreeNext = NULL ; |
duke@435 | 1787 | ListNext = NULL ; |
duke@435 | 1788 | ListPrev = NULL ; |
duke@435 | 1789 | OnList = 0 ; |
duke@435 | 1790 | TState = 0 ; |
duke@435 | 1791 | Notified = 0 ; |
duke@435 | 1792 | IsWaiting = 0 ; |
duke@435 | 1793 | } |
duke@435 | 1794 | |
duke@435 | 1795 | // We use placement-new to force ParkEvent instances to be |
duke@435 | 1796 | // aligned on 256-byte address boundaries. This ensures that the least |
duke@435 | 1797 | // significant byte of a ParkEvent address is always 0. |
duke@435 | 1798 | |
duke@435 | 1799 | void * operator new (size_t sz) ; |
duke@435 | 1800 | void operator delete (void * a) ; |
duke@435 | 1801 | |
duke@435 | 1802 | public: |
duke@435 | 1803 | static ParkEvent * Allocate (Thread * t) ; |
duke@435 | 1804 | static void Release (ParkEvent * e) ; |
duke@435 | 1805 | } ; |