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annotate src/share/vm/prims/jvmtiImpl.hpp @ 13409:77b028ba548c
8028396: Minimal VM: undefined symbol: _ZN23JvmtiCurrentBreakpoints11metadata_doEPFvP8MetadataE
Summary: Minimal VM doesn't run
Reviewed-by: coleenp, dholmes
| author | jprovino |
|---|---|
| date | Tue, 19 Nov 2013 16:26:54 -0500 |
| parents | 910026b800b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 7951 | 2 * Copyright (c) 1999, 2013, 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 #include "classfile/systemDictionary.hpp" | |
| 29 #include "jvmtifiles/jvmti.h" | |
| 30 #include "oops/objArrayOop.hpp" | |
| 31 #include "prims/jvmtiEnvThreadState.hpp" | |
| 32 #include "prims/jvmtiEventController.hpp" | |
| 33 #include "prims/jvmtiTrace.hpp" | |
| 34 #include "prims/jvmtiUtil.hpp" | |
| 35 #include "runtime/stackValueCollection.hpp" | |
| 36 #include "runtime/vm_operations.hpp" | |
| 37 | |
| 0 | 38 // |
| 39 // Forward Declarations | |
| 40 // | |
| 41 | |
| 42 class JvmtiBreakpoint; | |
| 43 class JvmtiBreakpoints; | |
| 44 | |
| 45 | |
| 46 /////////////////////////////////////////////////////////////// | |
| 47 // | |
| 48 // class GrowableCache, GrowableElement | |
| 49 // Used by : JvmtiBreakpointCache | |
| 50 // Used by JVMTI methods: none directly. | |
| 51 // | |
| 52 // GrowableCache is a permanent CHeap growable array of <GrowableElement *> | |
| 53 // | |
| 54 // In addition, the GrowableCache maintains a NULL terminated cache array of type address | |
| 55 // that's created from the element array using the function: | |
| 56 // address GrowableElement::getCacheValue(). | |
| 57 // | |
| 58 // Whenever the GrowableArray changes size, the cache array gets recomputed into a new C_HEAP allocated | |
| 59 // block of memory. Additionally, every time the cache changes its position in memory, the | |
| 60 // void (*_listener_fun)(void *this_obj, address* cache) | |
| 61 // gets called with the cache's new address. This gives the user of the GrowableCache a callback | |
| 62 // to update its pointer to the address cache. | |
| 63 // | |
| 64 | |
| 6197 | 65 class GrowableElement : public CHeapObj<mtInternal> { |
| 0 | 66 public: |
| 67 virtual address getCacheValue() =0; | |
| 68 virtual bool equals(GrowableElement* e) =0; | |
| 69 virtual bool lessThan(GrowableElement *e)=0; | |
| 70 virtual GrowableElement *clone() =0; | |
| 71 virtual void oops_do(OopClosure* f) =0; | |
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72 virtual void metadata_do(void f(Metadata*)) =0; |
| 0 | 73 }; |
| 74 | |
| 75 class GrowableCache VALUE_OBJ_CLASS_SPEC { | |
| 76 | |
| 77 private: | |
| 78 // Object pointer passed into cache & listener functions. | |
| 79 void *_this_obj; | |
| 80 | |
| 81 // Array of elements in the collection | |
| 82 GrowableArray<GrowableElement *> *_elements; | |
| 83 | |
| 84 // Parallel array of cached values | |
| 85 address *_cache; | |
| 86 | |
| 87 // Listener for changes to the _cache field. | |
| 88 // Called whenever the _cache field has it's value changed | |
| 89 // (but NOT when cached elements are recomputed). | |
| 90 void (*_listener_fun)(void *, address*); | |
| 91 | |
| 92 static bool equals(void *, GrowableElement *); | |
| 93 | |
| 94 // recache all elements after size change, notify listener | |
| 95 void recache(); | |
| 96 | |
| 97 public: | |
| 98 GrowableCache(); | |
| 99 ~GrowableCache(); | |
| 100 | |
| 101 void initialize(void *this_obj, void listener_fun(void *, address*) ); | |
| 102 | |
| 103 // number of elements in the collection | |
| 104 int length(); | |
| 105 // get the value of the index element in the collection | |
| 106 GrowableElement* at(int index); | |
| 107 // find the index of the element, -1 if it doesn't exist | |
| 108 int find(GrowableElement* e); | |
| 109 // append a copy of the element to the end of the collection, notify listener | |
| 110 void append(GrowableElement* e); | |
| 111 // insert a copy of the element using lessthan(), notify listener | |
| 112 void insert(GrowableElement* e); | |
| 113 // remove the element at index, notify listener | |
| 114 void remove (int index); | |
| 115 // clear out all elements and release all heap space, notify listener | |
| 116 void clear(); | |
| 117 // apply f to every element and update the cache | |
| 118 void oops_do(OopClosure* f); | |
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119 // walk metadata to preserve for RedefineClasses |
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120 void metadata_do(void f(Metadata*)); |
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121 // update the cache after a full gc |
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122 void gc_epilogue(); |
| 0 | 123 }; |
| 124 | |
| 125 | |
| 126 /////////////////////////////////////////////////////////////// | |
| 127 // | |
| 128 // class JvmtiBreakpointCache | |
| 129 // Used by : JvmtiBreakpoints | |
| 130 // Used by JVMTI methods: none directly. | |
| 131 // Note : typesafe wrapper for GrowableCache of JvmtiBreakpoint | |
| 132 // | |
| 133 | |
| 6197 | 134 class JvmtiBreakpointCache : public CHeapObj<mtInternal> { |
| 0 | 135 |
| 136 private: | |
| 137 GrowableCache _cache; | |
| 138 | |
| 139 public: | |
| 140 JvmtiBreakpointCache() {} | |
| 141 ~JvmtiBreakpointCache() {} | |
| 142 | |
| 143 void initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
| 144 _cache.initialize(this_obj,listener_fun); | |
| 145 } | |
| 146 | |
| 147 int length() { return _cache.length(); } | |
| 148 JvmtiBreakpoint& at(int index) { return (JvmtiBreakpoint&) *(_cache.at(index)); } | |
| 149 int find(JvmtiBreakpoint& e) { return _cache.find((GrowableElement *) &e); } | |
| 150 void append(JvmtiBreakpoint& e) { _cache.append((GrowableElement *) &e); } | |
| 151 void remove (int index) { _cache.remove(index); } | |
| 152 void clear() { _cache.clear(); } | |
| 153 void oops_do(OopClosure* f) { _cache.oops_do(f); } | |
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154 void metadata_do(void f(Metadata*)) { _cache.metadata_do(f); } |
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155 void gc_epilogue() { _cache.gc_epilogue(); } |
| 0 | 156 }; |
| 157 | |
| 158 | |
| 159 /////////////////////////////////////////////////////////////// | |
| 160 // | |
| 161 // class JvmtiBreakpoint | |
| 162 // Used by : JvmtiBreakpoints | |
| 163 // Used by JVMTI methods: SetBreakpoint, ClearBreakpoint, ClearAllBreakpoints | |
| 164 // Note: Extends GrowableElement for use in a GrowableCache | |
| 165 // | |
| 166 // A JvmtiBreakpoint describes a location (class, method, bci) to break at. | |
| 167 // | |
| 168 | |
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169 typedef void (Method::*method_action)(int _bci); |
| 0 | 170 |
| 171 class JvmtiBreakpoint : public GrowableElement { | |
| 172 private: | |
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173 Method* _method; |
| 0 | 174 int _bci; |
| 175 Bytecodes::Code _orig_bytecode; | |
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176 oop _class_holder; // keeps _method memory from being deallocated |
| 0 | 177 |
| 178 public: | |
| 179 JvmtiBreakpoint(); | |
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180 JvmtiBreakpoint(Method* m_method, jlocation location); |
| 0 | 181 bool equals(JvmtiBreakpoint& bp); |
| 182 bool lessThan(JvmtiBreakpoint &bp); | |
| 183 void copy(JvmtiBreakpoint& bp); | |
| 184 bool is_valid(); | |
| 185 address getBcp(); | |
| 186 void each_method_version_do(method_action meth_act); | |
| 187 void set(); | |
| 188 void clear(); | |
| 189 void print(); | |
| 190 | |
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191 Method* method() { return _method; } |
| 0 | 192 |
| 193 // GrowableElement implementation | |
| 194 address getCacheValue() { return getBcp(); } | |
| 195 bool lessThan(GrowableElement* e) { Unimplemented(); return false; } | |
| 196 bool equals(GrowableElement* e) { return equals((JvmtiBreakpoint&) *e); } | |
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197 void oops_do(OopClosure* f) { |
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198 // Mark the method loader as live so the Method* class loader doesn't get |
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199 // unloaded and Method* memory reclaimed. |
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200 f->do_oop(&_class_holder); |
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201 } |
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202 void metadata_do(void f(Metadata*)) { |
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203 // walk metadata to preserve for RedefineClasses |
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204 f(_method); |
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205 } |
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206 |
| 0 | 207 GrowableElement *clone() { |
| 208 JvmtiBreakpoint *bp = new JvmtiBreakpoint(); | |
| 209 bp->copy(*this); | |
| 210 return bp; | |
| 211 } | |
| 212 }; | |
| 213 | |
| 214 | |
| 215 /////////////////////////////////////////////////////////////// | |
| 216 // | |
| 217 // class JvmtiBreakpoints | |
| 218 // Used by : JvmtiCurrentBreakpoints | |
| 219 // Used by JVMTI methods: none directly | |
| 220 // Note: A Helper class | |
| 221 // | |
| 222 // JvmtiBreakpoints is a GrowableCache of JvmtiBreakpoint. | |
| 223 // All changes to the GrowableCache occur at a safepoint using VM_ChangeBreakpoints. | |
| 224 // | |
| 225 // Because _bps is only modified at safepoints, its possible to always use the | |
| 226 // cached byte code pointers from _bps without doing any synchronization (see JvmtiCurrentBreakpoints). | |
| 227 // | |
| 228 // It would be possible to make JvmtiBreakpoints a static class, but I've made it | |
| 229 // CHeap allocated to emphasize its similarity to JvmtiFramePops. | |
| 230 // | |
| 231 | |
| 6197 | 232 class JvmtiBreakpoints : public CHeapObj<mtInternal> { |
| 0 | 233 private: |
| 234 | |
| 235 JvmtiBreakpointCache _bps; | |
| 236 | |
| 237 // These should only be used by VM_ChangeBreakpoints | |
| 238 // to insure they only occur at safepoints. | |
| 239 // Todo: add checks for safepoint | |
| 240 friend class VM_ChangeBreakpoints; | |
| 241 void set_at_safepoint(JvmtiBreakpoint& bp); | |
| 242 void clear_at_safepoint(JvmtiBreakpoint& bp); | |
| 243 | |
| 244 static void do_element(GrowableElement *e); | |
| 245 | |
| 246 public: | |
| 247 JvmtiBreakpoints(void listener_fun(void *, address *)); | |
| 248 ~JvmtiBreakpoints(); | |
| 249 | |
| 250 int length(); | |
| 251 void oops_do(OopClosure* f); | |
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252 void metadata_do(void f(Metadata*)); |
| 0 | 253 void print(); |
| 254 | |
| 255 int set(JvmtiBreakpoint& bp); | |
| 256 int clear(JvmtiBreakpoint& bp); | |
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257 void clearall_in_class_at_safepoint(Klass* klass); |
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258 void gc_epilogue(); |
| 0 | 259 }; |
| 260 | |
| 261 | |
| 262 /////////////////////////////////////////////////////////////// | |
| 263 // | |
| 264 // class JvmtiCurrentBreakpoints | |
| 265 // | |
| 266 // A static wrapper class for the JvmtiBreakpoints that provides: | |
| 267 // 1. a fast inlined function to check if a byte code pointer is a breakpoint (is_breakpoint). | |
| 268 // 2. a function for lazily creating the JvmtiBreakpoints class (this is not strictly necessary, | |
| 269 // but I'm copying the code from JvmtiThreadState which needs to lazily initialize | |
| 270 // JvmtiFramePops). | |
| 271 // 3. An oops_do entry point for GC'ing the breakpoint array. | |
| 272 // | |
| 273 | |
| 274 class JvmtiCurrentBreakpoints : public AllStatic { | |
| 275 | |
| 276 private: | |
| 277 | |
| 278 // Current breakpoints, lazily initialized by get_jvmti_breakpoints(); | |
| 279 static JvmtiBreakpoints *_jvmti_breakpoints; | |
| 280 | |
| 281 // NULL terminated cache of byte-code pointers corresponding to current breakpoints. | |
| 282 // Updated only at safepoints (with listener_fun) when the cache is moved. | |
| 283 // It exists only to make is_breakpoint fast. | |
| 284 static address *_breakpoint_list; | |
| 285 static inline void set_breakpoint_list(address *breakpoint_list) { _breakpoint_list = breakpoint_list; } | |
| 286 static inline address *get_breakpoint_list() { return _breakpoint_list; } | |
| 287 | |
| 288 // Listener for the GrowableCache in _jvmti_breakpoints, updates _breakpoint_list. | |
| 289 static void listener_fun(void *this_obj, address *cache); | |
| 290 | |
| 291 public: | |
| 292 static void initialize(); | |
| 293 static void destroy(); | |
| 294 | |
| 295 // lazily create _jvmti_breakpoints and _breakpoint_list | |
| 296 static JvmtiBreakpoints& get_jvmti_breakpoints(); | |
| 297 | |
| 298 // quickly test whether the bcp matches a cached breakpoint in the list | |
| 299 static inline bool is_breakpoint(address bcp); | |
| 300 | |
| 301 static void oops_do(OopClosure* f); | |
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302 static void metadata_do(void f(Metadata*)) NOT_JVMTI_RETURN; |
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303 static void gc_epilogue(); |
| 0 | 304 }; |
| 305 | |
| 306 // quickly test whether the bcp matches a cached breakpoint in the list | |
| 307 bool JvmtiCurrentBreakpoints::is_breakpoint(address bcp) { | |
| 308 address *bps = get_breakpoint_list(); | |
| 309 if (bps == NULL) return false; | |
| 310 for ( ; (*bps) != NULL; bps++) { | |
| 311 if ((*bps) == bcp) return true; | |
| 312 } | |
| 313 return false; | |
| 314 } | |
| 315 | |
| 10405 | 316 |
| 317 /////////////////////////////////////////////////////////////// | |
| 318 // | |
| 319 // class VM_ChangeBreakpoints | |
| 320 // Used by : JvmtiBreakpoints | |
| 321 // Used by JVMTI methods: none directly. | |
| 322 // Note: A Helper class. | |
| 323 // | |
| 324 // VM_ChangeBreakpoints implements a VM_Operation for ALL modifications to the JvmtiBreakpoints class. | |
| 325 // | |
| 326 | |
| 327 class VM_ChangeBreakpoints : public VM_Operation { | |
| 328 private: | |
| 329 JvmtiBreakpoints* _breakpoints; | |
| 330 int _operation; | |
| 331 JvmtiBreakpoint* _bp; | |
| 332 | |
| 333 public: | |
| 334 enum { SET_BREAKPOINT=0, CLEAR_BREAKPOINT=1 }; | |
| 335 | |
| 336 VM_ChangeBreakpoints(int operation, JvmtiBreakpoint *bp) { | |
| 337 JvmtiBreakpoints& current_bps = JvmtiCurrentBreakpoints::get_jvmti_breakpoints(); | |
| 338 _breakpoints = ¤t_bps; | |
| 339 _bp = bp; | |
| 340 _operation = operation; | |
| 341 assert(bp != NULL, "bp != NULL"); | |
| 342 } | |
| 343 | |
| 344 VMOp_Type type() const { return VMOp_ChangeBreakpoints; } | |
| 345 void doit(); | |
| 346 void oops_do(OopClosure* f); | |
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347 void metadata_do(void f(Metadata*)); |
| 10405 | 348 }; |
| 349 | |
| 350 | |
| 0 | 351 /////////////////////////////////////////////////////////////// |
| 352 // The get/set local operations must only be done by the VM thread | |
| 353 // because the interpreter version needs to access oop maps, which can | |
| 354 // only safely be done by the VM thread | |
| 355 // | |
| 356 // I'm told that in 1.5 oop maps are now protected by a lock and | |
| 357 // we could get rid of the VM op | |
| 358 // However if the VM op is removed then the target thread must | |
| 359 // be suspended AND a lock will be needed to prevent concurrent | |
| 360 // setting of locals to the same java thread. This lock is needed | |
| 361 // to prevent compiledVFrames from trying to add deferred updates | |
| 362 // to the thread simultaneously. | |
| 363 // | |
| 364 class VM_GetOrSetLocal : public VM_Operation { | |
| 2019 | 365 protected: |
| 0 | 366 JavaThread* _thread; |
| 367 JavaThread* _calling_thread; | |
| 368 jint _depth; | |
| 369 jint _index; | |
| 370 BasicType _type; | |
| 371 jvalue _value; | |
| 372 javaVFrame* _jvf; | |
| 373 bool _set; | |
| 374 | |
| 2019 | 375 // It is possible to get the receiver out of a non-static native wrapper |
| 376 // frame. Use VM_GetReceiver to do this. | |
| 377 virtual bool getting_receiver() const { return false; } | |
| 378 | |
| 0 | 379 jvmtiError _result; |
| 380 | |
| 381 vframe* get_vframe(); | |
| 382 javaVFrame* get_java_vframe(); | |
| 383 bool check_slot_type(javaVFrame* vf); | |
| 384 | |
| 385 public: | |
| 386 // Constructor for non-object getter | |
| 387 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type); | |
| 388 | |
| 389 // Constructor for object or non-object setter | |
| 390 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type, jvalue value); | |
| 391 | |
| 392 // Constructor for object getter | |
| 393 VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, | |
| 394 int index); | |
| 395 | |
| 396 VMOp_Type type() const { return VMOp_GetOrSetLocal; } | |
| 397 jvalue value() { return _value; } | |
| 398 jvmtiError result() { return _result; } | |
| 399 | |
| 400 bool doit_prologue(); | |
| 401 void doit(); | |
| 402 bool allow_nested_vm_operations() const; | |
| 403 const char* name() const { return "get/set locals"; } | |
| 404 | |
| 405 // Check that the klass is assignable to a type with the given signature. | |
| 406 static bool is_assignable(const char* ty_sign, Klass* klass, Thread* thread); | |
| 407 }; | |
| 408 | |
| 2019 | 409 class VM_GetReceiver : public VM_GetOrSetLocal { |
| 410 protected: | |
| 411 virtual bool getting_receiver() const { return true; } | |
| 412 | |
| 413 public: | |
| 414 VM_GetReceiver(JavaThread* thread, JavaThread* calling_thread, jint depth); | |
| 415 const char* name() const { return "get receiver"; } | |
| 416 }; | |
| 417 | |
| 0 | 418 |
| 419 /////////////////////////////////////////////////////////////// | |
| 420 // | |
| 421 // class JvmtiSuspendControl | |
| 422 // | |
| 423 // Convenience routines for suspending and resuming threads. | |
| 424 // | |
| 425 // All attempts by JVMTI to suspend and resume threads must go through the | |
| 426 // JvmtiSuspendControl interface. | |
| 427 // | |
| 428 // methods return true if successful | |
| 429 // | |
| 430 class JvmtiSuspendControl : public AllStatic { | |
| 431 public: | |
| 432 // suspend the thread, taking it to a safepoint | |
| 433 static bool suspend(JavaThread *java_thread); | |
| 434 // resume the thread | |
| 435 static bool resume(JavaThread *java_thread); | |
| 436 | |
| 437 static void print(); | |
| 438 }; | |
| 439 | |
|
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440 |
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441 /** |
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442 * When a thread (such as the compiler thread or VM thread) cannot post a |
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443 * JVMTI event itself because the event needs to be posted from a Java |
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444 * thread, then it can defer the event to the Service thread for posting. |
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445 * The information needed to post the event is encapsulated into this class |
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446 * and then enqueued onto the JvmtiDeferredEventQueue, where the Service |
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447 * thread will pick it up and post it. |
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448 * |
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449 * This is currently only used for posting compiled-method-load and unload |
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450 * events, which we don't want posted from the compiler thread. |
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451 */ |
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452 class JvmtiDeferredEvent VALUE_OBJ_CLASS_SPEC { |
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453 friend class JvmtiDeferredEventQueue; |
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454 private: |
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455 typedef enum { |
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456 TYPE_NONE, |
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457 TYPE_COMPILED_METHOD_LOAD, |
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458 TYPE_COMPILED_METHOD_UNLOAD, |
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459 TYPE_DYNAMIC_CODE_GENERATED |
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460 } Type; |
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461 |
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462 Type _type; |
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463 union { |
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464 nmethod* compiled_method_load; |
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465 struct { |
|
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466 nmethod* nm; |
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467 jmethodID method_id; |
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468 const void* code_begin; |
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469 } compiled_method_unload; |
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470 struct { |
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471 const char* name; |
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472 const void* code_begin; |
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473 const void* code_end; |
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474 } dynamic_code_generated; |
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475 } _event_data; |
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476 |
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477 JvmtiDeferredEvent(Type t) : _type(t) {} |
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478 |
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479 public: |
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480 |
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481 JvmtiDeferredEvent() : _type(TYPE_NONE) {} |
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482 |
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483 // Factory methods |
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484 static JvmtiDeferredEvent compiled_method_load_event(nmethod* nm) |
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485 NOT_JVMTI_RETURN_(JvmtiDeferredEvent()); |
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486 static JvmtiDeferredEvent compiled_method_unload_event(nmethod* nm, |
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487 jmethodID id, const void* code) NOT_JVMTI_RETURN_(JvmtiDeferredEvent()); |
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488 static JvmtiDeferredEvent dynamic_code_generated_event( |
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489 const char* name, const void* begin, const void* end) |
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490 NOT_JVMTI_RETURN_(JvmtiDeferredEvent()); |
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491 |
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492 // Actually posts the event. |
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493 void post() NOT_JVMTI_RETURN; |
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494 }; |
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495 |
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496 /** |
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497 * Events enqueued on this queue wake up the Service thread which dequeues |
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498 * and posts the events. The Service_lock is required to be held |
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499 * when operating on the queue (except for the "pending" events). |
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500 */ |
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501 class JvmtiDeferredEventQueue : AllStatic { |
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502 friend class JvmtiDeferredEvent; |
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503 private: |
| 6197 | 504 class QueueNode : public CHeapObj<mtInternal> { |
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505 private: |
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506 JvmtiDeferredEvent _event; |
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507 QueueNode* _next; |
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508 |
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509 public: |
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510 QueueNode(const JvmtiDeferredEvent& event) |
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511 : _event(event), _next(NULL) {} |
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512 |
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513 const JvmtiDeferredEvent& event() const { return _event; } |
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514 QueueNode* next() const { return _next; } |
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515 |
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516 void set_next(QueueNode* next) { _next = next; } |
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517 }; |
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518 |
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519 static QueueNode* _queue_head; // Hold Service_lock to access |
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520 static QueueNode* _queue_tail; // Hold Service_lock to access |
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521 static volatile QueueNode* _pending_list; // Uses CAS for read/update |
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522 |
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523 // Transfers events from the _pending_list to the _queue. |
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524 static void process_pending_events() NOT_JVMTI_RETURN; |
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525 |
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526 public: |
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527 // Must be holding Service_lock when calling these |
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528 static bool has_events() NOT_JVMTI_RETURN_(false); |
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529 static void enqueue(const JvmtiDeferredEvent& event) NOT_JVMTI_RETURN; |
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530 static JvmtiDeferredEvent dequeue() NOT_JVMTI_RETURN_(JvmtiDeferredEvent()); |
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531 |
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532 // Used to enqueue events without using a lock, for times (such as during |
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533 // safepoint) when we can't or don't want to lock the Service_lock. |
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534 // |
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535 // Events will be held off to the side until there's a call to |
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536 // dequeue(), enqueue(), or process_pending_events() (all of which require |
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537 // the holding of the Service_lock), and will be enqueued at that time. |
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538 static void add_pending_event(const JvmtiDeferredEvent&) NOT_JVMTI_RETURN; |
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539 }; |
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540 |
| 0 | 541 // Utility macro that checks for NULL pointers: |
| 542 #define NULL_CHECK(X, Y) if ((X) == NULL) { return (Y); } | |
| 1972 | 543 |
| 544 #endif // SHARE_VM_PRIMS_JVMTIIMPL_HPP |