Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiImpl.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | fb19af007ffc |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_PRIMS_JVMTIIMPL_HPP |
| 26 #define SHARE_VM_PRIMS_JVMTIIMPL_HPP | |
| 27 | |
| 28 #ifndef JVMTI_KERNEL | |
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29 |
| 1972 | 30 #include "classfile/systemDictionary.hpp" |
| 31 #include "jvmtifiles/jvmti.h" | |
| 32 #include "oops/objArrayOop.hpp" | |
| 33 #include "prims/jvmtiEnvThreadState.hpp" | |
| 34 #include "prims/jvmtiEventController.hpp" | |
| 35 #include "prims/jvmtiTrace.hpp" | |
| 36 #include "prims/jvmtiUtil.hpp" | |
| 37 #include "runtime/stackValueCollection.hpp" | |
| 38 #include "runtime/vm_operations.hpp" | |
| 39 | |
| 0 | 40 // |
| 41 // Forward Declarations | |
| 42 // | |
| 43 | |
| 44 class JvmtiBreakpoint; | |
| 45 class JvmtiBreakpoints; | |
| 46 | |
| 47 | |
| 48 /////////////////////////////////////////////////////////////// | |
| 49 // | |
| 50 // class GrowableCache, GrowableElement | |
| 51 // Used by : JvmtiBreakpointCache | |
| 52 // Used by JVMTI methods: none directly. | |
| 53 // | |
| 54 // GrowableCache is a permanent CHeap growable array of <GrowableElement *> | |
| 55 // | |
| 56 // In addition, the GrowableCache maintains a NULL terminated cache array of type address | |
| 57 // that's created from the element array using the function: | |
| 58 // address GrowableElement::getCacheValue(). | |
| 59 // | |
| 60 // Whenever the GrowableArray changes size, the cache array gets recomputed into a new C_HEAP allocated | |
| 61 // block of memory. Additionally, every time the cache changes its position in memory, the | |
| 62 // void (*_listener_fun)(void *this_obj, address* cache) | |
| 63 // gets called with the cache's new address. This gives the user of the GrowableCache a callback | |
| 64 // to update its pointer to the address cache. | |
| 65 // | |
| 66 | |
| 6197 | 67 class GrowableElement : public CHeapObj<mtInternal> { |
| 0 | 68 public: |
| 69 virtual address getCacheValue() =0; | |
| 70 virtual bool equals(GrowableElement* e) =0; | |
| 71 virtual bool lessThan(GrowableElement *e)=0; | |
| 72 virtual GrowableElement *clone() =0; | |
| 73 virtual void oops_do(OopClosure* f) =0; | |
| 74 }; | |
| 75 | |
| 76 class GrowableCache VALUE_OBJ_CLASS_SPEC { | |
| 77 | |
| 78 private: | |
| 79 // Object pointer passed into cache & listener functions. | |
| 80 void *_this_obj; | |
| 81 | |
| 82 // Array of elements in the collection | |
| 83 GrowableArray<GrowableElement *> *_elements; | |
| 84 | |
| 85 // Parallel array of cached values | |
| 86 address *_cache; | |
| 87 | |
| 88 // Listener for changes to the _cache field. | |
| 89 // Called whenever the _cache field has it's value changed | |
| 90 // (but NOT when cached elements are recomputed). | |
| 91 void (*_listener_fun)(void *, address*); | |
| 92 | |
| 93 static bool equals(void *, GrowableElement *); | |
| 94 | |
| 95 // recache all elements after size change, notify listener | |
| 96 void recache(); | |
| 97 | |
| 98 public: | |
| 99 GrowableCache(); | |
| 100 ~GrowableCache(); | |
| 101 | |
| 102 void initialize(void *this_obj, void listener_fun(void *, address*) ); | |
| 103 | |
| 104 // number of elements in the collection | |
| 105 int length(); | |
| 106 // get the value of the index element in the collection | |
| 107 GrowableElement* at(int index); | |
| 108 // find the index of the element, -1 if it doesn't exist | |
| 109 int find(GrowableElement* e); | |
| 110 // append a copy of the element to the end of the collection, notify listener | |
| 111 void append(GrowableElement* e); | |
| 112 // insert a copy of the element using lessthan(), notify listener | |
| 113 void insert(GrowableElement* e); | |
| 114 // remove the element at index, notify listener | |
| 115 void remove (int index); | |
| 116 // clear out all elements and release all heap space, notify listener | |
| 117 void clear(); | |
| 118 // apply f to every element and update the cache | |
| 119 void oops_do(OopClosure* f); | |
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120 // update the cache after a full gc |
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121 void gc_epilogue(); |
| 0 | 122 }; |
| 123 | |
| 124 | |
| 125 /////////////////////////////////////////////////////////////// | |
| 126 // | |
| 127 // class JvmtiBreakpointCache | |
| 128 // Used by : JvmtiBreakpoints | |
| 129 // Used by JVMTI methods: none directly. | |
| 130 // Note : typesafe wrapper for GrowableCache of JvmtiBreakpoint | |
| 131 // | |
| 132 | |
| 6197 | 133 class JvmtiBreakpointCache : public CHeapObj<mtInternal> { |
| 0 | 134 |
| 135 private: | |
| 136 GrowableCache _cache; | |
| 137 | |
| 138 public: | |
| 139 JvmtiBreakpointCache() {} | |
| 140 ~JvmtiBreakpointCache() {} | |
| 141 | |
| 142 void initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
| 143 _cache.initialize(this_obj,listener_fun); | |
| 144 } | |
| 145 | |
| 146 int length() { return _cache.length(); } | |
| 147 JvmtiBreakpoint& at(int index) { return (JvmtiBreakpoint&) *(_cache.at(index)); } | |
| 148 int find(JvmtiBreakpoint& e) { return _cache.find((GrowableElement *) &e); } | |
| 149 void append(JvmtiBreakpoint& e) { _cache.append((GrowableElement *) &e); } | |
| 150 void remove (int index) { _cache.remove(index); } | |
| 151 void clear() { _cache.clear(); } | |
| 152 void oops_do(OopClosure* f) { _cache.oops_do(f); } | |
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153 void gc_epilogue() { _cache.gc_epilogue(); } |
| 0 | 154 }; |
| 155 | |
| 156 | |
| 157 /////////////////////////////////////////////////////////////// | |
| 158 // | |
| 159 // class JvmtiBreakpoint | |
| 160 // Used by : JvmtiBreakpoints | |
| 161 // Used by JVMTI methods: SetBreakpoint, ClearBreakpoint, ClearAllBreakpoints | |
| 162 // Note: Extends GrowableElement for use in a GrowableCache | |
| 163 // | |
| 164 // A JvmtiBreakpoint describes a location (class, method, bci) to break at. | |
| 165 // | |
| 166 | |
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167 typedef void (Method::*method_action)(int _bci); |
| 0 | 168 |
| 169 class JvmtiBreakpoint : public GrowableElement { | |
| 170 private: | |
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171 Method* _method; |
| 0 | 172 int _bci; |
| 173 Bytecodes::Code _orig_bytecode; | |
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174 oop _class_loader; |
| 0 | 175 |
| 176 public: | |
| 177 JvmtiBreakpoint(); | |
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178 JvmtiBreakpoint(Method* m_method, jlocation location); |
| 0 | 179 bool equals(JvmtiBreakpoint& bp); |
| 180 bool lessThan(JvmtiBreakpoint &bp); | |
| 181 void copy(JvmtiBreakpoint& bp); | |
| 182 bool is_valid(); | |
| 183 address getBcp(); | |
| 184 void each_method_version_do(method_action meth_act); | |
| 185 void set(); | |
| 186 void clear(); | |
| 187 void print(); | |
| 188 | |
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189 Method* method() { return _method; } |
| 0 | 190 |
| 191 // GrowableElement implementation | |
| 192 address getCacheValue() { return getBcp(); } | |
| 193 bool lessThan(GrowableElement* e) { Unimplemented(); return false; } | |
| 194 bool equals(GrowableElement* e) { return equals((JvmtiBreakpoint&) *e); } | |
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195 void oops_do(OopClosure* f) { |
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196 // Mark the method loader as live |
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197 f->do_oop(&_class_loader); |
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198 } |
| 0 | 199 GrowableElement *clone() { |
| 200 JvmtiBreakpoint *bp = new JvmtiBreakpoint(); | |
| 201 bp->copy(*this); | |
| 202 return bp; | |
| 203 } | |
| 204 }; | |
| 205 | |
| 206 | |
| 207 /////////////////////////////////////////////////////////////// | |
| 208 // | |
| 209 // class VM_ChangeBreakpoints | |
| 210 // Used by : JvmtiBreakpoints | |
| 211 // Used by JVMTI methods: none directly. | |
| 212 // Note: A Helper class. | |
| 213 // | |
| 214 // VM_ChangeBreakpoints implements a VM_Operation for ALL modifications to the JvmtiBreakpoints class. | |
| 215 // | |
| 216 | |
| 217 class VM_ChangeBreakpoints : public VM_Operation { | |
| 218 private: | |
| 219 JvmtiBreakpoints* _breakpoints; | |
| 220 int _operation; | |
| 221 JvmtiBreakpoint* _bp; | |
| 222 | |
| 223 public: | |
| 224 enum { SET_BREAKPOINT=0, CLEAR_BREAKPOINT=1, CLEAR_ALL_BREAKPOINT=2 }; | |
| 225 | |
| 226 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation) { | |
| 227 _breakpoints = breakpoints; | |
| 228 _bp = NULL; | |
| 229 _operation = operation; | |
| 230 assert(breakpoints != NULL, "breakpoints != NULL"); | |
| 231 assert(operation == CLEAR_ALL_BREAKPOINT, "unknown breakpoint operation"); | |
| 232 } | |
| 233 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation, JvmtiBreakpoint *bp) { | |
| 234 _breakpoints = breakpoints; | |
| 235 _bp = bp; | |
| 236 _operation = operation; | |
| 237 assert(breakpoints != NULL, "breakpoints != NULL"); | |
| 238 assert(bp != NULL, "bp != NULL"); | |
| 239 assert(operation == SET_BREAKPOINT || operation == CLEAR_BREAKPOINT , "unknown breakpoint operation"); | |
| 240 } | |
| 241 | |
| 242 VMOp_Type type() const { return VMOp_ChangeBreakpoints; } | |
| 243 void doit(); | |
| 244 void oops_do(OopClosure* f); | |
| 245 }; | |
| 246 | |
| 247 | |
| 248 /////////////////////////////////////////////////////////////// | |
| 249 // | |
| 250 // class JvmtiBreakpoints | |
| 251 // Used by : JvmtiCurrentBreakpoints | |
| 252 // Used by JVMTI methods: none directly | |
| 253 // Note: A Helper class | |
| 254 // | |
| 255 // JvmtiBreakpoints is a GrowableCache of JvmtiBreakpoint. | |
| 256 // All changes to the GrowableCache occur at a safepoint using VM_ChangeBreakpoints. | |
| 257 // | |
| 258 // Because _bps is only modified at safepoints, its possible to always use the | |
| 259 // cached byte code pointers from _bps without doing any synchronization (see JvmtiCurrentBreakpoints). | |
| 260 // | |
| 261 // It would be possible to make JvmtiBreakpoints a static class, but I've made it | |
| 262 // CHeap allocated to emphasize its similarity to JvmtiFramePops. | |
| 263 // | |
| 264 | |
| 6197 | 265 class JvmtiBreakpoints : public CHeapObj<mtInternal> { |
| 0 | 266 private: |
| 267 | |
| 268 JvmtiBreakpointCache _bps; | |
| 269 | |
| 270 // These should only be used by VM_ChangeBreakpoints | |
| 271 // to insure they only occur at safepoints. | |
| 272 // Todo: add checks for safepoint | |
| 273 friend class VM_ChangeBreakpoints; | |
| 274 void set_at_safepoint(JvmtiBreakpoint& bp); | |
| 275 void clear_at_safepoint(JvmtiBreakpoint& bp); | |
| 276 void clearall_at_safepoint(); | |
| 277 | |
| 278 static void do_element(GrowableElement *e); | |
| 279 | |
| 280 public: | |
| 281 JvmtiBreakpoints(void listener_fun(void *, address *)); | |
| 282 ~JvmtiBreakpoints(); | |
| 283 | |
| 284 int length(); | |
| 285 void oops_do(OopClosure* f); | |
| 286 void print(); | |
| 287 | |
| 288 int set(JvmtiBreakpoint& bp); | |
| 289 int clear(JvmtiBreakpoint& bp); | |
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290 void clearall_in_class_at_safepoint(Klass* klass); |
| 0 | 291 void clearall(); |
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292 void gc_epilogue(); |
| 0 | 293 }; |
| 294 | |
| 295 | |
| 296 /////////////////////////////////////////////////////////////// | |
| 297 // | |
| 298 // class JvmtiCurrentBreakpoints | |
| 299 // | |
| 300 // A static wrapper class for the JvmtiBreakpoints that provides: | |
| 301 // 1. a fast inlined function to check if a byte code pointer is a breakpoint (is_breakpoint). | |
| 302 // 2. a function for lazily creating the JvmtiBreakpoints class (this is not strictly necessary, | |
| 303 // but I'm copying the code from JvmtiThreadState which needs to lazily initialize | |
| 304 // JvmtiFramePops). | |
| 305 // 3. An oops_do entry point for GC'ing the breakpoint array. | |
| 306 // | |
| 307 | |
| 308 class JvmtiCurrentBreakpoints : public AllStatic { | |
| 309 | |
| 310 private: | |
| 311 | |
| 312 // Current breakpoints, lazily initialized by get_jvmti_breakpoints(); | |
| 313 static JvmtiBreakpoints *_jvmti_breakpoints; | |
| 314 | |
| 315 // NULL terminated cache of byte-code pointers corresponding to current breakpoints. | |
| 316 // Updated only at safepoints (with listener_fun) when the cache is moved. | |
| 317 // It exists only to make is_breakpoint fast. | |
| 318 static address *_breakpoint_list; | |
| 319 static inline void set_breakpoint_list(address *breakpoint_list) { _breakpoint_list = breakpoint_list; } | |
| 320 static inline address *get_breakpoint_list() { return _breakpoint_list; } | |
| 321 | |
| 322 // Listener for the GrowableCache in _jvmti_breakpoints, updates _breakpoint_list. | |
| 323 static void listener_fun(void *this_obj, address *cache); | |
| 324 | |
| 325 public: | |
| 326 static void initialize(); | |
| 327 static void destroy(); | |
| 328 | |
| 329 // lazily create _jvmti_breakpoints and _breakpoint_list | |
| 330 static JvmtiBreakpoints& get_jvmti_breakpoints(); | |
| 331 | |
| 332 // quickly test whether the bcp matches a cached breakpoint in the list | |
| 333 static inline bool is_breakpoint(address bcp); | |
| 334 | |
| 335 static void oops_do(OopClosure* f); | |
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336 static void gc_epilogue(); |
| 0 | 337 }; |
| 338 | |
| 339 // quickly test whether the bcp matches a cached breakpoint in the list | |
| 340 bool JvmtiCurrentBreakpoints::is_breakpoint(address bcp) { | |
| 341 address *bps = get_breakpoint_list(); | |
| 342 if (bps == NULL) return false; | |
| 343 for ( ; (*bps) != NULL; bps++) { | |
| 344 if ((*bps) == bcp) return true; | |
| 345 } | |
| 346 return false; | |
| 347 } | |
| 348 | |
| 349 /////////////////////////////////////////////////////////////// | |
| 350 // The get/set local operations must only be done by the VM thread | |
| 351 // because the interpreter version needs to access oop maps, which can | |
| 352 // only safely be done by the VM thread | |
| 353 // | |
| 354 // I'm told that in 1.5 oop maps are now protected by a lock and | |
| 355 // we could get rid of the VM op | |
| 356 // However if the VM op is removed then the target thread must | |
| 357 // be suspended AND a lock will be needed to prevent concurrent | |
| 358 // setting of locals to the same java thread. This lock is needed | |
| 359 // to prevent compiledVFrames from trying to add deferred updates | |
| 360 // to the thread simultaneously. | |
| 361 // | |
| 362 class VM_GetOrSetLocal : public VM_Operation { | |
| 2019 | 363 protected: |
| 0 | 364 JavaThread* _thread; |
| 365 JavaThread* _calling_thread; | |
| 366 jint _depth; | |
| 367 jint _index; | |
| 368 BasicType _type; | |
| 369 jvalue _value; | |
| 370 javaVFrame* _jvf; | |
| 371 bool _set; | |
| 372 | |
| 2019 | 373 // It is possible to get the receiver out of a non-static native wrapper |
| 374 // frame. Use VM_GetReceiver to do this. | |
| 375 virtual bool getting_receiver() const { return false; } | |
| 376 | |
| 0 | 377 jvmtiError _result; |
| 378 | |
| 379 vframe* get_vframe(); | |
| 380 javaVFrame* get_java_vframe(); | |
| 381 bool check_slot_type(javaVFrame* vf); | |
| 382 | |
| 383 public: | |
| 384 // Constructor for non-object getter | |
| 385 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type); | |
| 386 | |
| 387 // Constructor for object or non-object setter | |
| 388 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type, jvalue value); | |
| 389 | |
| 390 // Constructor for object getter | |
| 391 VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, | |
| 392 int index); | |
| 393 | |
| 394 VMOp_Type type() const { return VMOp_GetOrSetLocal; } | |
| 395 jvalue value() { return _value; } | |
| 396 jvmtiError result() { return _result; } | |
| 397 | |
| 398 bool doit_prologue(); | |
| 399 void doit(); | |
| 400 bool allow_nested_vm_operations() const; | |
| 401 const char* name() const { return "get/set locals"; } | |
| 402 | |
| 403 // Check that the klass is assignable to a type with the given signature. | |
| 404 static bool is_assignable(const char* ty_sign, Klass* klass, Thread* thread); | |
| 405 }; | |
| 406 | |
| 2019 | 407 class VM_GetReceiver : public VM_GetOrSetLocal { |
| 408 protected: | |
| 409 virtual bool getting_receiver() const { return true; } | |
| 410 | |
| 411 public: | |
| 412 VM_GetReceiver(JavaThread* thread, JavaThread* calling_thread, jint depth); | |
| 413 const char* name() const { return "get receiver"; } | |
| 414 }; | |
| 415 | |
| 0 | 416 |
| 417 /////////////////////////////////////////////////////////////// | |
| 418 // | |
| 419 // class JvmtiSuspendControl | |
| 420 // | |
| 421 // Convenience routines for suspending and resuming threads. | |
| 422 // | |
| 423 // All attempts by JVMTI to suspend and resume threads must go through the | |
| 424 // JvmtiSuspendControl interface. | |
| 425 // | |
| 426 // methods return true if successful | |
| 427 // | |
| 428 class JvmtiSuspendControl : public AllStatic { | |
| 429 public: | |
| 430 // suspend the thread, taking it to a safepoint | |
| 431 static bool suspend(JavaThread *java_thread); | |
| 432 // resume the thread | |
| 433 static bool resume(JavaThread *java_thread); | |
| 434 | |
| 435 static void print(); | |
| 436 }; | |
| 437 | |
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438 #endif // !JVMTI_KERNEL |
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439 |
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440 /** |
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441 * When a thread (such as the compiler thread or VM thread) cannot post a |
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442 * JVMTI event itself because the event needs to be posted from a Java |
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443 * thread, then it can defer the event to the Service thread for posting. |
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444 * The information needed to post the event is encapsulated into this class |
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445 * and then enqueued onto the JvmtiDeferredEventQueue, where the Service |
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446 * thread will pick it up and post it. |
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447 * |
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448 * This is currently only used for posting compiled-method-load and unload |
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449 * events, which we don't want posted from the compiler thread. |
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450 */ |
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451 class JvmtiDeferredEvent VALUE_OBJ_CLASS_SPEC { |
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452 friend class JvmtiDeferredEventQueue; |
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453 private: |
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454 typedef enum { |
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455 TYPE_NONE, |
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456 TYPE_COMPILED_METHOD_LOAD, |
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457 TYPE_COMPILED_METHOD_UNLOAD, |
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458 TYPE_DYNAMIC_CODE_GENERATED |
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459 } Type; |
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460 |
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461 Type _type; |
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462 union { |
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463 nmethod* compiled_method_load; |
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464 struct { |
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465 nmethod* nm; |
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466 jmethodID method_id; |
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467 const void* code_begin; |
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468 } compiled_method_unload; |
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469 struct { |
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470 const char* name; |
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471 const void* code_begin; |
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472 const void* code_end; |
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473 } dynamic_code_generated; |
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474 } _event_data; |
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475 |
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476 JvmtiDeferredEvent(Type t) : _type(t) {} |
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477 |
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478 public: |
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479 |
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480 JvmtiDeferredEvent() : _type(TYPE_NONE) {} |
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481 |
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482 // Factory methods |
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483 static JvmtiDeferredEvent compiled_method_load_event(nmethod* nm) |
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484 KERNEL_RETURN_(JvmtiDeferredEvent()); |
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485 static JvmtiDeferredEvent compiled_method_unload_event(nmethod* nm, |
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486 jmethodID id, const void* code) KERNEL_RETURN_(JvmtiDeferredEvent()); |
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487 static JvmtiDeferredEvent dynamic_code_generated_event( |
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488 const char* name, const void* begin, const void* end) |
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489 KERNEL_RETURN_(JvmtiDeferredEvent()); |
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490 |
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491 // Actually posts the event. |
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492 void post() KERNEL_RETURN; |
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493 }; |
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494 |
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495 /** |
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496 * Events enqueued on this queue wake up the Service thread which dequeues |
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497 * and posts the events. The Service_lock is required to be held |
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498 * when operating on the queue (except for the "pending" events). |
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499 */ |
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500 class JvmtiDeferredEventQueue : AllStatic { |
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501 friend class JvmtiDeferredEvent; |
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502 private: |
| 6197 | 503 class QueueNode : public CHeapObj<mtInternal> { |
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504 private: |
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505 JvmtiDeferredEvent _event; |
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506 QueueNode* _next; |
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507 |
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508 public: |
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509 QueueNode(const JvmtiDeferredEvent& event) |
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510 : _event(event), _next(NULL) {} |
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511 |
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512 const JvmtiDeferredEvent& event() const { return _event; } |
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513 QueueNode* next() const { return _next; } |
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514 |
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515 void set_next(QueueNode* next) { _next = next; } |
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516 }; |
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517 |
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518 static QueueNode* _queue_head; // Hold Service_lock to access |
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519 static QueueNode* _queue_tail; // Hold Service_lock to access |
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520 static volatile QueueNode* _pending_list; // Uses CAS for read/update |
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521 |
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522 // Transfers events from the _pending_list to the _queue. |
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523 static void process_pending_events() KERNEL_RETURN; |
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524 |
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525 public: |
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526 // Must be holding Service_lock when calling these |
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527 static bool has_events() KERNEL_RETURN_(false); |
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528 static void enqueue(const JvmtiDeferredEvent& event) KERNEL_RETURN; |
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529 static JvmtiDeferredEvent dequeue() KERNEL_RETURN_(JvmtiDeferredEvent()); |
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530 |
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531 // Used to enqueue events without using a lock, for times (such as during |
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532 // safepoint) when we can't or don't want to lock the Service_lock. |
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533 // |
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534 // Events will be held off to the side until there's a call to |
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535 // dequeue(), enqueue(), or process_pending_events() (all of which require |
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536 // the holding of the Service_lock), and will be enqueued at that time. |
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537 static void add_pending_event(const JvmtiDeferredEvent&) KERNEL_RETURN; |
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538 }; |
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539 |
| 0 | 540 // Utility macro that checks for NULL pointers: |
| 541 #define NULL_CHECK(X, Y) if ((X) == NULL) { return (Y); } | |
| 1972 | 542 |
| 543 #endif // SHARE_VM_PRIMS_JVMTIIMPL_HPP |