Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiImpl.hpp @ 1878:fa83ab460c54
6988353: refactor contended sync subsystem
Summary: reduce complexity by factoring synchronizer.cpp
Reviewed-by: dholmes, never, coleenp
| author | acorn |
|---|---|
| date | Fri, 22 Oct 2010 15:59:34 -0400 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved. |
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| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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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 | |
| 25 // | |
| 26 // Forward Declarations | |
| 27 // | |
| 28 | |
| 29 class JvmtiBreakpoint; | |
| 30 class JvmtiBreakpoints; | |
| 31 | |
| 32 | |
| 33 /////////////////////////////////////////////////////////////// | |
| 34 // | |
| 35 // class GrowableCache, GrowableElement | |
| 36 // Used by : JvmtiBreakpointCache | |
| 37 // Used by JVMTI methods: none directly. | |
| 38 // | |
| 39 // GrowableCache is a permanent CHeap growable array of <GrowableElement *> | |
| 40 // | |
| 41 // In addition, the GrowableCache maintains a NULL terminated cache array of type address | |
| 42 // that's created from the element array using the function: | |
| 43 // address GrowableElement::getCacheValue(). | |
| 44 // | |
| 45 // Whenever the GrowableArray changes size, the cache array gets recomputed into a new C_HEAP allocated | |
| 46 // block of memory. Additionally, every time the cache changes its position in memory, the | |
| 47 // void (*_listener_fun)(void *this_obj, address* cache) | |
| 48 // gets called with the cache's new address. This gives the user of the GrowableCache a callback | |
| 49 // to update its pointer to the address cache. | |
| 50 // | |
| 51 | |
| 52 class GrowableElement : public CHeapObj { | |
| 53 public: | |
| 54 virtual address getCacheValue() =0; | |
| 55 virtual bool equals(GrowableElement* e) =0; | |
| 56 virtual bool lessThan(GrowableElement *e)=0; | |
| 57 virtual GrowableElement *clone() =0; | |
| 58 virtual void oops_do(OopClosure* f) =0; | |
| 59 }; | |
| 60 | |
| 61 class GrowableCache VALUE_OBJ_CLASS_SPEC { | |
| 62 | |
| 63 private: | |
| 64 // Object pointer passed into cache & listener functions. | |
| 65 void *_this_obj; | |
| 66 | |
| 67 // Array of elements in the collection | |
| 68 GrowableArray<GrowableElement *> *_elements; | |
| 69 | |
| 70 // Parallel array of cached values | |
| 71 address *_cache; | |
| 72 | |
| 73 // Listener for changes to the _cache field. | |
| 74 // Called whenever the _cache field has it's value changed | |
| 75 // (but NOT when cached elements are recomputed). | |
| 76 void (*_listener_fun)(void *, address*); | |
| 77 | |
| 78 static bool equals(void *, GrowableElement *); | |
| 79 | |
| 80 // recache all elements after size change, notify listener | |
| 81 void recache(); | |
| 82 | |
| 83 public: | |
| 84 GrowableCache(); | |
| 85 ~GrowableCache(); | |
| 86 | |
| 87 void initialize(void *this_obj, void listener_fun(void *, address*) ); | |
| 88 | |
| 89 // number of elements in the collection | |
| 90 int length(); | |
| 91 // get the value of the index element in the collection | |
| 92 GrowableElement* at(int index); | |
| 93 // find the index of the element, -1 if it doesn't exist | |
| 94 int find(GrowableElement* e); | |
| 95 // append a copy of the element to the end of the collection, notify listener | |
| 96 void append(GrowableElement* e); | |
| 97 // insert a copy of the element using lessthan(), notify listener | |
| 98 void insert(GrowableElement* e); | |
| 99 // remove the element at index, notify listener | |
| 100 void remove (int index); | |
| 101 // clear out all elements and release all heap space, notify listener | |
| 102 void clear(); | |
| 103 // apply f to every element and update the cache | |
| 104 void oops_do(OopClosure* f); | |
| 105 void gc_epilogue(); | |
| 106 }; | |
| 107 | |
| 108 | |
| 109 /////////////////////////////////////////////////////////////// | |
| 110 // | |
| 111 // class JvmtiBreakpointCache | |
| 112 // Used by : JvmtiBreakpoints | |
| 113 // Used by JVMTI methods: none directly. | |
| 114 // Note : typesafe wrapper for GrowableCache of JvmtiBreakpoint | |
| 115 // | |
| 116 | |
| 117 class JvmtiBreakpointCache : public CHeapObj { | |
| 118 | |
| 119 private: | |
| 120 GrowableCache _cache; | |
| 121 | |
| 122 public: | |
| 123 JvmtiBreakpointCache() {} | |
| 124 ~JvmtiBreakpointCache() {} | |
| 125 | |
| 126 void initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
| 127 _cache.initialize(this_obj,listener_fun); | |
| 128 } | |
| 129 | |
| 130 int length() { return _cache.length(); } | |
| 131 JvmtiBreakpoint& at(int index) { return (JvmtiBreakpoint&) *(_cache.at(index)); } | |
| 132 int find(JvmtiBreakpoint& e) { return _cache.find((GrowableElement *) &e); } | |
| 133 void append(JvmtiBreakpoint& e) { _cache.append((GrowableElement *) &e); } | |
| 134 void remove (int index) { _cache.remove(index); } | |
| 135 void clear() { _cache.clear(); } | |
| 136 void oops_do(OopClosure* f) { _cache.oops_do(f); } | |
| 137 void gc_epilogue() { _cache.gc_epilogue(); } | |
| 138 }; | |
| 139 | |
| 140 | |
| 141 /////////////////////////////////////////////////////////////// | |
| 142 // | |
| 143 // class JvmtiBreakpoint | |
| 144 // Used by : JvmtiBreakpoints | |
| 145 // Used by JVMTI methods: SetBreakpoint, ClearBreakpoint, ClearAllBreakpoints | |
| 146 // Note: Extends GrowableElement for use in a GrowableCache | |
| 147 // | |
| 148 // A JvmtiBreakpoint describes a location (class, method, bci) to break at. | |
| 149 // | |
| 150 | |
| 151 typedef void (methodOopDesc::*method_action)(int _bci); | |
| 152 | |
| 153 class JvmtiBreakpoint : public GrowableElement { | |
| 154 private: | |
| 155 methodOop _method; | |
| 156 int _bci; | |
| 157 Bytecodes::Code _orig_bytecode; | |
| 158 | |
| 159 public: | |
| 160 JvmtiBreakpoint(); | |
| 161 JvmtiBreakpoint(methodOop m_method, jlocation location); | |
| 162 bool equals(JvmtiBreakpoint& bp); | |
| 163 bool lessThan(JvmtiBreakpoint &bp); | |
| 164 void copy(JvmtiBreakpoint& bp); | |
| 165 bool is_valid(); | |
| 166 address getBcp(); | |
| 167 void each_method_version_do(method_action meth_act); | |
| 168 void set(); | |
| 169 void clear(); | |
| 170 void print(); | |
| 171 | |
| 172 methodOop method() { return _method; } | |
| 173 | |
| 174 // GrowableElement implementation | |
| 175 address getCacheValue() { return getBcp(); } | |
| 176 bool lessThan(GrowableElement* e) { Unimplemented(); return false; } | |
| 177 bool equals(GrowableElement* e) { return equals((JvmtiBreakpoint&) *e); } | |
| 178 void oops_do(OopClosure* f) { f->do_oop((oop *) &_method); } | |
| 179 GrowableElement *clone() { | |
| 180 JvmtiBreakpoint *bp = new JvmtiBreakpoint(); | |
| 181 bp->copy(*this); | |
| 182 return bp; | |
| 183 } | |
| 184 }; | |
| 185 | |
| 186 | |
| 187 /////////////////////////////////////////////////////////////// | |
| 188 // | |
| 189 // class VM_ChangeBreakpoints | |
| 190 // Used by : JvmtiBreakpoints | |
| 191 // Used by JVMTI methods: none directly. | |
| 192 // Note: A Helper class. | |
| 193 // | |
| 194 // VM_ChangeBreakpoints implements a VM_Operation for ALL modifications to the JvmtiBreakpoints class. | |
| 195 // | |
| 196 | |
| 197 class VM_ChangeBreakpoints : public VM_Operation { | |
| 198 private: | |
| 199 JvmtiBreakpoints* _breakpoints; | |
| 200 int _operation; | |
| 201 JvmtiBreakpoint* _bp; | |
| 202 | |
| 203 public: | |
| 204 enum { SET_BREAKPOINT=0, CLEAR_BREAKPOINT=1, CLEAR_ALL_BREAKPOINT=2 }; | |
| 205 | |
| 206 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation) { | |
| 207 _breakpoints = breakpoints; | |
| 208 _bp = NULL; | |
| 209 _operation = operation; | |
| 210 assert(breakpoints != NULL, "breakpoints != NULL"); | |
| 211 assert(operation == CLEAR_ALL_BREAKPOINT, "unknown breakpoint operation"); | |
| 212 } | |
| 213 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation, JvmtiBreakpoint *bp) { | |
| 214 _breakpoints = breakpoints; | |
| 215 _bp = bp; | |
| 216 _operation = operation; | |
| 217 assert(breakpoints != NULL, "breakpoints != NULL"); | |
| 218 assert(bp != NULL, "bp != NULL"); | |
| 219 assert(operation == SET_BREAKPOINT || operation == CLEAR_BREAKPOINT , "unknown breakpoint operation"); | |
| 220 } | |
| 221 | |
| 222 VMOp_Type type() const { return VMOp_ChangeBreakpoints; } | |
| 223 void doit(); | |
| 224 void oops_do(OopClosure* f); | |
| 225 }; | |
| 226 | |
| 227 | |
| 228 /////////////////////////////////////////////////////////////// | |
| 229 // | |
| 230 // class JvmtiBreakpoints | |
| 231 // Used by : JvmtiCurrentBreakpoints | |
| 232 // Used by JVMTI methods: none directly | |
| 233 // Note: A Helper class | |
| 234 // | |
| 235 // JvmtiBreakpoints is a GrowableCache of JvmtiBreakpoint. | |
| 236 // All changes to the GrowableCache occur at a safepoint using VM_ChangeBreakpoints. | |
| 237 // | |
| 238 // Because _bps is only modified at safepoints, its possible to always use the | |
| 239 // cached byte code pointers from _bps without doing any synchronization (see JvmtiCurrentBreakpoints). | |
| 240 // | |
| 241 // It would be possible to make JvmtiBreakpoints a static class, but I've made it | |
| 242 // CHeap allocated to emphasize its similarity to JvmtiFramePops. | |
| 243 // | |
| 244 | |
| 245 class JvmtiBreakpoints : public CHeapObj { | |
| 246 private: | |
| 247 | |
| 248 JvmtiBreakpointCache _bps; | |
| 249 | |
| 250 // These should only be used by VM_ChangeBreakpoints | |
| 251 // to insure they only occur at safepoints. | |
| 252 // Todo: add checks for safepoint | |
| 253 friend class VM_ChangeBreakpoints; | |
| 254 void set_at_safepoint(JvmtiBreakpoint& bp); | |
| 255 void clear_at_safepoint(JvmtiBreakpoint& bp); | |
| 256 void clearall_at_safepoint(); | |
| 257 | |
| 258 static void do_element(GrowableElement *e); | |
| 259 | |
| 260 public: | |
| 261 JvmtiBreakpoints(void listener_fun(void *, address *)); | |
| 262 ~JvmtiBreakpoints(); | |
| 263 | |
| 264 int length(); | |
| 265 void oops_do(OopClosure* f); | |
| 266 void gc_epilogue(); | |
| 267 void print(); | |
| 268 | |
| 269 int set(JvmtiBreakpoint& bp); | |
| 270 int clear(JvmtiBreakpoint& bp); | |
| 271 void clearall_in_class_at_safepoint(klassOop klass); | |
| 272 void clearall(); | |
| 273 }; | |
| 274 | |
| 275 | |
| 276 /////////////////////////////////////////////////////////////// | |
| 277 // | |
| 278 // class JvmtiCurrentBreakpoints | |
| 279 // | |
| 280 // A static wrapper class for the JvmtiBreakpoints that provides: | |
| 281 // 1. a fast inlined function to check if a byte code pointer is a breakpoint (is_breakpoint). | |
| 282 // 2. a function for lazily creating the JvmtiBreakpoints class (this is not strictly necessary, | |
| 283 // but I'm copying the code from JvmtiThreadState which needs to lazily initialize | |
| 284 // JvmtiFramePops). | |
| 285 // 3. An oops_do entry point for GC'ing the breakpoint array. | |
| 286 // | |
| 287 | |
| 288 class JvmtiCurrentBreakpoints : public AllStatic { | |
| 289 | |
| 290 private: | |
| 291 | |
| 292 // Current breakpoints, lazily initialized by get_jvmti_breakpoints(); | |
| 293 static JvmtiBreakpoints *_jvmti_breakpoints; | |
| 294 | |
| 295 // NULL terminated cache of byte-code pointers corresponding to current breakpoints. | |
| 296 // Updated only at safepoints (with listener_fun) when the cache is moved. | |
| 297 // It exists only to make is_breakpoint fast. | |
| 298 static address *_breakpoint_list; | |
| 299 static inline void set_breakpoint_list(address *breakpoint_list) { _breakpoint_list = breakpoint_list; } | |
| 300 static inline address *get_breakpoint_list() { return _breakpoint_list; } | |
| 301 | |
| 302 // Listener for the GrowableCache in _jvmti_breakpoints, updates _breakpoint_list. | |
| 303 static void listener_fun(void *this_obj, address *cache); | |
| 304 | |
| 305 public: | |
| 306 static void initialize(); | |
| 307 static void destroy(); | |
| 308 | |
| 309 // lazily create _jvmti_breakpoints and _breakpoint_list | |
| 310 static JvmtiBreakpoints& get_jvmti_breakpoints(); | |
| 311 | |
| 312 // quickly test whether the bcp matches a cached breakpoint in the list | |
| 313 static inline bool is_breakpoint(address bcp); | |
| 314 | |
| 315 static void oops_do(OopClosure* f); | |
| 316 static void gc_epilogue(); | |
| 317 }; | |
| 318 | |
| 319 // quickly test whether the bcp matches a cached breakpoint in the list | |
| 320 bool JvmtiCurrentBreakpoints::is_breakpoint(address bcp) { | |
| 321 address *bps = get_breakpoint_list(); | |
| 322 if (bps == NULL) return false; | |
| 323 for ( ; (*bps) != NULL; bps++) { | |
| 324 if ((*bps) == bcp) return true; | |
| 325 } | |
| 326 return false; | |
| 327 } | |
| 328 | |
| 329 /////////////////////////////////////////////////////////////// | |
| 330 // The get/set local operations must only be done by the VM thread | |
| 331 // because the interpreter version needs to access oop maps, which can | |
| 332 // only safely be done by the VM thread | |
| 333 // | |
| 334 // I'm told that in 1.5 oop maps are now protected by a lock and | |
| 335 // we could get rid of the VM op | |
| 336 // However if the VM op is removed then the target thread must | |
| 337 // be suspended AND a lock will be needed to prevent concurrent | |
| 338 // setting of locals to the same java thread. This lock is needed | |
| 339 // to prevent compiledVFrames from trying to add deferred updates | |
| 340 // to the thread simultaneously. | |
| 341 // | |
| 342 class VM_GetOrSetLocal : public VM_Operation { | |
| 343 private: | |
| 344 JavaThread* _thread; | |
| 345 JavaThread* _calling_thread; | |
| 346 jint _depth; | |
| 347 jint _index; | |
| 348 BasicType _type; | |
| 349 jvalue _value; | |
| 350 javaVFrame* _jvf; | |
| 351 bool _set; | |
| 352 | |
| 353 jvmtiError _result; | |
| 354 | |
| 355 vframe* get_vframe(); | |
| 356 javaVFrame* get_java_vframe(); | |
| 357 bool check_slot_type(javaVFrame* vf); | |
| 358 | |
| 359 public: | |
| 360 // Constructor for non-object getter | |
| 361 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type); | |
| 362 | |
| 363 // Constructor for object or non-object setter | |
| 364 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type, jvalue value); | |
| 365 | |
| 366 // Constructor for object getter | |
| 367 VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, | |
| 368 int index); | |
| 369 | |
| 370 VMOp_Type type() const { return VMOp_GetOrSetLocal; } | |
| 371 jvalue value() { return _value; } | |
| 372 jvmtiError result() { return _result; } | |
| 373 | |
| 374 bool doit_prologue(); | |
| 375 void doit(); | |
| 376 bool allow_nested_vm_operations() const; | |
| 377 const char* name() const { return "get/set locals"; } | |
| 378 | |
| 379 // Check that the klass is assignable to a type with the given signature. | |
| 380 static bool is_assignable(const char* ty_sign, Klass* klass, Thread* thread); | |
| 381 }; | |
| 382 | |
| 383 | |
| 384 /////////////////////////////////////////////////////////////// | |
| 385 // | |
| 386 // class JvmtiSuspendControl | |
| 387 // | |
| 388 // Convenience routines for suspending and resuming threads. | |
| 389 // | |
| 390 // All attempts by JVMTI to suspend and resume threads must go through the | |
| 391 // JvmtiSuspendControl interface. | |
| 392 // | |
| 393 // methods return true if successful | |
| 394 // | |
| 395 class JvmtiSuspendControl : public AllStatic { | |
| 396 public: | |
| 397 // suspend the thread, taking it to a safepoint | |
| 398 static bool suspend(JavaThread *java_thread); | |
| 399 // resume the thread | |
| 400 static bool resume(JavaThread *java_thread); | |
| 401 | |
| 402 static void print(); | |
| 403 }; | |
| 404 | |
| 405 // Utility macro that checks for NULL pointers: | |
| 406 #define NULL_CHECK(X, Y) if ((X) == NULL) { return (Y); } |