Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiImpl.hpp @ 611:2f716c0acb64
6567360: 3/4 SIGBUS in jvmti RawMonitor magic check for unaligned bad monitor pointer
Summary: Change JvmtiEnvBase::is_valid() and JvmtiRawMonitor::is_valid() to fetch the _magic fields via Bytes::get_native_u[248]().
Reviewed-by: coleenp, swamyv
| author | dcubed |
|---|---|
| date | Mon, 02 Mar 2009 14:05:07 -0700 |
| parents | a61af66fc99e |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved. | |
| 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // | |
| 26 // Forward Declarations | |
| 27 // | |
| 28 | |
| 29 class JvmtiRawMonitor; | |
| 30 class JvmtiBreakpoint; | |
| 31 class JvmtiBreakpoints; | |
| 32 | |
| 33 | |
| 34 /////////////////////////////////////////////////////////////// | |
| 35 // | |
| 36 // class GrowableCache, GrowableElement | |
| 37 // Used by : JvmtiBreakpointCache | |
| 38 // Used by JVMTI methods: none directly. | |
| 39 // | |
| 40 // GrowableCache is a permanent CHeap growable array of <GrowableElement *> | |
| 41 // | |
| 42 // In addition, the GrowableCache maintains a NULL terminated cache array of type address | |
| 43 // that's created from the element array using the function: | |
| 44 // address GrowableElement::getCacheValue(). | |
| 45 // | |
| 46 // Whenever the GrowableArray changes size, the cache array gets recomputed into a new C_HEAP allocated | |
| 47 // block of memory. Additionally, every time the cache changes its position in memory, the | |
| 48 // void (*_listener_fun)(void *this_obj, address* cache) | |
| 49 // gets called with the cache's new address. This gives the user of the GrowableCache a callback | |
| 50 // to update its pointer to the address cache. | |
| 51 // | |
| 52 | |
| 53 class GrowableElement : public CHeapObj { | |
| 54 public: | |
| 55 virtual address getCacheValue() =0; | |
| 56 virtual bool equals(GrowableElement* e) =0; | |
| 57 virtual bool lessThan(GrowableElement *e)=0; | |
| 58 virtual GrowableElement *clone() =0; | |
| 59 virtual void oops_do(OopClosure* f) =0; | |
| 60 }; | |
| 61 | |
| 62 class GrowableCache VALUE_OBJ_CLASS_SPEC { | |
| 63 | |
| 64 private: | |
| 65 // Object pointer passed into cache & listener functions. | |
| 66 void *_this_obj; | |
| 67 | |
| 68 // Array of elements in the collection | |
| 69 GrowableArray<GrowableElement *> *_elements; | |
| 70 | |
| 71 // Parallel array of cached values | |
| 72 address *_cache; | |
| 73 | |
| 74 // Listener for changes to the _cache field. | |
| 75 // Called whenever the _cache field has it's value changed | |
| 76 // (but NOT when cached elements are recomputed). | |
| 77 void (*_listener_fun)(void *, address*); | |
| 78 | |
| 79 static bool equals(void *, GrowableElement *); | |
| 80 | |
| 81 // recache all elements after size change, notify listener | |
| 82 void recache(); | |
| 83 | |
| 84 public: | |
| 85 GrowableCache(); | |
| 86 ~GrowableCache(); | |
| 87 | |
| 88 void initialize(void *this_obj, void listener_fun(void *, address*) ); | |
| 89 | |
| 90 // number of elements in the collection | |
| 91 int length(); | |
| 92 // get the value of the index element in the collection | |
| 93 GrowableElement* at(int index); | |
| 94 // find the index of the element, -1 if it doesn't exist | |
| 95 int find(GrowableElement* e); | |
| 96 // append a copy of the element to the end of the collection, notify listener | |
| 97 void append(GrowableElement* e); | |
| 98 // insert a copy of the element using lessthan(), notify listener | |
| 99 void insert(GrowableElement* e); | |
| 100 // remove the element at index, notify listener | |
| 101 void remove (int index); | |
| 102 // clear out all elements and release all heap space, notify listener | |
| 103 void clear(); | |
| 104 // apply f to every element and update the cache | |
| 105 void oops_do(OopClosure* f); | |
| 106 void gc_epilogue(); | |
| 107 }; | |
| 108 | |
| 109 | |
| 110 /////////////////////////////////////////////////////////////// | |
| 111 // | |
| 112 // class JvmtiBreakpointCache | |
| 113 // Used by : JvmtiBreakpoints | |
| 114 // Used by JVMTI methods: none directly. | |
| 115 // Note : typesafe wrapper for GrowableCache of JvmtiBreakpoint | |
| 116 // | |
| 117 | |
| 118 class JvmtiBreakpointCache : public CHeapObj { | |
| 119 | |
| 120 private: | |
| 121 GrowableCache _cache; | |
| 122 | |
| 123 public: | |
| 124 JvmtiBreakpointCache() {} | |
| 125 ~JvmtiBreakpointCache() {} | |
| 126 | |
| 127 void initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
| 128 _cache.initialize(this_obj,listener_fun); | |
| 129 } | |
| 130 | |
| 131 int length() { return _cache.length(); } | |
| 132 JvmtiBreakpoint& at(int index) { return (JvmtiBreakpoint&) *(_cache.at(index)); } | |
| 133 int find(JvmtiBreakpoint& e) { return _cache.find((GrowableElement *) &e); } | |
| 134 void append(JvmtiBreakpoint& e) { _cache.append((GrowableElement *) &e); } | |
| 135 void remove (int index) { _cache.remove(index); } | |
| 136 void clear() { _cache.clear(); } | |
| 137 void oops_do(OopClosure* f) { _cache.oops_do(f); } | |
| 138 void gc_epilogue() { _cache.gc_epilogue(); } | |
| 139 }; | |
| 140 | |
| 141 | |
| 142 /////////////////////////////////////////////////////////////// | |
| 143 // | |
| 144 // class JvmtiBreakpoint | |
| 145 // Used by : JvmtiBreakpoints | |
| 146 // Used by JVMTI methods: SetBreakpoint, ClearBreakpoint, ClearAllBreakpoints | |
| 147 // Note: Extends GrowableElement for use in a GrowableCache | |
| 148 // | |
| 149 // A JvmtiBreakpoint describes a location (class, method, bci) to break at. | |
| 150 // | |
| 151 | |
| 152 typedef void (methodOopDesc::*method_action)(int _bci); | |
| 153 | |
| 154 class JvmtiBreakpoint : public GrowableElement { | |
| 155 private: | |
| 156 methodOop _method; | |
| 157 int _bci; | |
| 158 Bytecodes::Code _orig_bytecode; | |
| 159 | |
| 160 public: | |
| 161 JvmtiBreakpoint(); | |
| 162 JvmtiBreakpoint(methodOop m_method, jlocation location); | |
| 163 bool equals(JvmtiBreakpoint& bp); | |
| 164 bool lessThan(JvmtiBreakpoint &bp); | |
| 165 void copy(JvmtiBreakpoint& bp); | |
| 166 bool is_valid(); | |
| 167 address getBcp(); | |
| 168 void each_method_version_do(method_action meth_act); | |
| 169 void set(); | |
| 170 void clear(); | |
| 171 void print(); | |
| 172 | |
| 173 methodOop method() { return _method; } | |
| 174 | |
| 175 // GrowableElement implementation | |
| 176 address getCacheValue() { return getBcp(); } | |
| 177 bool lessThan(GrowableElement* e) { Unimplemented(); return false; } | |
| 178 bool equals(GrowableElement* e) { return equals((JvmtiBreakpoint&) *e); } | |
| 179 void oops_do(OopClosure* f) { f->do_oop((oop *) &_method); } | |
| 180 GrowableElement *clone() { | |
| 181 JvmtiBreakpoint *bp = new JvmtiBreakpoint(); | |
| 182 bp->copy(*this); | |
| 183 return bp; | |
| 184 } | |
| 185 }; | |
| 186 | |
| 187 | |
| 188 /////////////////////////////////////////////////////////////// | |
| 189 // | |
| 190 // class VM_ChangeBreakpoints | |
| 191 // Used by : JvmtiBreakpoints | |
| 192 // Used by JVMTI methods: none directly. | |
| 193 // Note: A Helper class. | |
| 194 // | |
| 195 // VM_ChangeBreakpoints implements a VM_Operation for ALL modifications to the JvmtiBreakpoints class. | |
| 196 // | |
| 197 | |
| 198 class VM_ChangeBreakpoints : public VM_Operation { | |
| 199 private: | |
| 200 JvmtiBreakpoints* _breakpoints; | |
| 201 int _operation; | |
| 202 JvmtiBreakpoint* _bp; | |
| 203 | |
| 204 public: | |
| 205 enum { SET_BREAKPOINT=0, CLEAR_BREAKPOINT=1, CLEAR_ALL_BREAKPOINT=2 }; | |
| 206 | |
| 207 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation) { | |
| 208 _breakpoints = breakpoints; | |
| 209 _bp = NULL; | |
| 210 _operation = operation; | |
| 211 assert(breakpoints != NULL, "breakpoints != NULL"); | |
| 212 assert(operation == CLEAR_ALL_BREAKPOINT, "unknown breakpoint operation"); | |
| 213 } | |
| 214 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation, JvmtiBreakpoint *bp) { | |
| 215 _breakpoints = breakpoints; | |
| 216 _bp = bp; | |
| 217 _operation = operation; | |
| 218 assert(breakpoints != NULL, "breakpoints != NULL"); | |
| 219 assert(bp != NULL, "bp != NULL"); | |
| 220 assert(operation == SET_BREAKPOINT || operation == CLEAR_BREAKPOINT , "unknown breakpoint operation"); | |
| 221 } | |
| 222 | |
| 223 VMOp_Type type() const { return VMOp_ChangeBreakpoints; } | |
| 224 void doit(); | |
| 225 void oops_do(OopClosure* f); | |
| 226 }; | |
| 227 | |
| 228 | |
| 229 /////////////////////////////////////////////////////////////// | |
| 230 // | |
| 231 // class JvmtiBreakpoints | |
| 232 // Used by : JvmtiCurrentBreakpoints | |
| 233 // Used by JVMTI methods: none directly | |
| 234 // Note: A Helper class | |
| 235 // | |
| 236 // JvmtiBreakpoints is a GrowableCache of JvmtiBreakpoint. | |
| 237 // All changes to the GrowableCache occur at a safepoint using VM_ChangeBreakpoints. | |
| 238 // | |
| 239 // Because _bps is only modified at safepoints, its possible to always use the | |
| 240 // cached byte code pointers from _bps without doing any synchronization (see JvmtiCurrentBreakpoints). | |
| 241 // | |
| 242 // It would be possible to make JvmtiBreakpoints a static class, but I've made it | |
| 243 // CHeap allocated to emphasize its similarity to JvmtiFramePops. | |
| 244 // | |
| 245 | |
| 246 class JvmtiBreakpoints : public CHeapObj { | |
| 247 private: | |
| 248 | |
| 249 JvmtiBreakpointCache _bps; | |
| 250 | |
| 251 // These should only be used by VM_ChangeBreakpoints | |
| 252 // to insure they only occur at safepoints. | |
| 253 // Todo: add checks for safepoint | |
| 254 friend class VM_ChangeBreakpoints; | |
| 255 void set_at_safepoint(JvmtiBreakpoint& bp); | |
| 256 void clear_at_safepoint(JvmtiBreakpoint& bp); | |
| 257 void clearall_at_safepoint(); | |
| 258 | |
| 259 static void do_element(GrowableElement *e); | |
| 260 | |
| 261 public: | |
| 262 JvmtiBreakpoints(void listener_fun(void *, address *)); | |
| 263 ~JvmtiBreakpoints(); | |
| 264 | |
| 265 int length(); | |
| 266 void oops_do(OopClosure* f); | |
| 267 void gc_epilogue(); | |
| 268 void print(); | |
| 269 | |
| 270 int set(JvmtiBreakpoint& bp); | |
| 271 int clear(JvmtiBreakpoint& bp); | |
| 272 void clearall_in_class_at_safepoint(klassOop klass); | |
| 273 void clearall(); | |
| 274 }; | |
| 275 | |
| 276 | |
| 277 /////////////////////////////////////////////////////////////// | |
| 278 // | |
| 279 // class JvmtiCurrentBreakpoints | |
| 280 // | |
| 281 // A static wrapper class for the JvmtiBreakpoints that provides: | |
| 282 // 1. a fast inlined function to check if a byte code pointer is a breakpoint (is_breakpoint). | |
| 283 // 2. a function for lazily creating the JvmtiBreakpoints class (this is not strictly necessary, | |
| 284 // but I'm copying the code from JvmtiThreadState which needs to lazily initialize | |
| 285 // JvmtiFramePops). | |
| 286 // 3. An oops_do entry point for GC'ing the breakpoint array. | |
| 287 // | |
| 288 | |
| 289 class JvmtiCurrentBreakpoints : public AllStatic { | |
| 290 | |
| 291 private: | |
| 292 | |
| 293 // Current breakpoints, lazily initialized by get_jvmti_breakpoints(); | |
| 294 static JvmtiBreakpoints *_jvmti_breakpoints; | |
| 295 | |
| 296 // NULL terminated cache of byte-code pointers corresponding to current breakpoints. | |
| 297 // Updated only at safepoints (with listener_fun) when the cache is moved. | |
| 298 // It exists only to make is_breakpoint fast. | |
| 299 static address *_breakpoint_list; | |
| 300 static inline void set_breakpoint_list(address *breakpoint_list) { _breakpoint_list = breakpoint_list; } | |
| 301 static inline address *get_breakpoint_list() { return _breakpoint_list; } | |
| 302 | |
| 303 // Listener for the GrowableCache in _jvmti_breakpoints, updates _breakpoint_list. | |
| 304 static void listener_fun(void *this_obj, address *cache); | |
| 305 | |
| 306 public: | |
| 307 static void initialize(); | |
| 308 static void destroy(); | |
| 309 | |
| 310 // lazily create _jvmti_breakpoints and _breakpoint_list | |
| 311 static JvmtiBreakpoints& get_jvmti_breakpoints(); | |
| 312 | |
| 313 // quickly test whether the bcp matches a cached breakpoint in the list | |
| 314 static inline bool is_breakpoint(address bcp); | |
| 315 | |
| 316 static void oops_do(OopClosure* f); | |
| 317 static void gc_epilogue(); | |
| 318 }; | |
| 319 | |
| 320 // quickly test whether the bcp matches a cached breakpoint in the list | |
| 321 bool JvmtiCurrentBreakpoints::is_breakpoint(address bcp) { | |
| 322 address *bps = get_breakpoint_list(); | |
| 323 if (bps == NULL) return false; | |
| 324 for ( ; (*bps) != NULL; bps++) { | |
| 325 if ((*bps) == bcp) return true; | |
| 326 } | |
| 327 return false; | |
| 328 } | |
| 329 | |
| 330 | |
| 331 /////////////////////////////////////////////////////////////// | |
| 332 // | |
| 333 // class JvmtiRawMonitor | |
| 334 // | |
| 335 // Used by JVMTI methods: All RawMonitor methods (CreateRawMonitor, EnterRawMonitor, etc.) | |
| 336 // | |
| 337 // Wrapper for ObjectMonitor class that saves the Monitor's name | |
| 338 // | |
| 339 | |
| 340 class JvmtiRawMonitor : public ObjectMonitor { | |
| 341 private: | |
| 342 int _magic; | |
| 343 char * _name; | |
| 344 // JVMTI_RM_MAGIC is set in contructor and unset in destructor. | |
| 345 enum { JVMTI_RM_MAGIC = (int)(('T' << 24) | ('I' << 16) | ('R' << 8) | 'M') }; | |
| 346 | |
| 347 public: | |
| 348 JvmtiRawMonitor(const char *name); | |
| 349 ~JvmtiRawMonitor(); | |
| 350 int magic() { return _magic; } | |
| 351 const char *get_name() { return _name; } | |
|
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2f716c0acb64
6567360: 3/4 SIGBUS in jvmti RawMonitor magic check for unaligned bad monitor pointer
dcubed
parents:
0
diff
changeset
|
352 bool is_valid(); |
| 0 | 353 }; |
| 354 | |
| 355 // Onload pending raw monitors | |
| 356 // Class is used to cache onload or onstart monitor enter | |
| 357 // which will transition into real monitor when | |
| 358 // VM is fully initialized. | |
| 359 class JvmtiPendingMonitors : public AllStatic { | |
| 360 | |
| 361 private: | |
| 362 static GrowableArray<JvmtiRawMonitor*> *_monitors; // Cache raw monitor enter | |
| 363 | |
| 364 inline static GrowableArray<JvmtiRawMonitor*>* monitors() { return _monitors; } | |
| 365 | |
| 366 static void dispose() { | |
| 367 delete monitors(); | |
| 368 } | |
| 369 | |
| 370 public: | |
| 371 static void enter(JvmtiRawMonitor *monitor) { | |
| 372 monitors()->append(monitor); | |
| 373 } | |
| 374 | |
| 375 static int count() { | |
| 376 return monitors()->length(); | |
| 377 } | |
| 378 | |
| 379 static void destroy(JvmtiRawMonitor *monitor) { | |
| 380 while (monitors()->contains(monitor)) { | |
| 381 monitors()->remove(monitor); | |
| 382 } | |
| 383 } | |
| 384 | |
| 385 // Return false if monitor is not found in the list. | |
| 386 static bool exit(JvmtiRawMonitor *monitor) { | |
| 387 if (monitors()->contains(monitor)) { | |
| 388 monitors()->remove(monitor); | |
| 389 return true; | |
| 390 } else { | |
| 391 return false; | |
| 392 } | |
| 393 } | |
| 394 | |
| 395 static void transition_raw_monitors(); | |
| 396 }; | |
| 397 | |
| 398 | |
| 399 | |
| 400 /////////////////////////////////////////////////////////////// | |
| 401 // The get/set local operations must only be done by the VM thread | |
| 402 // because the interpreter version needs to access oop maps, which can | |
| 403 // only safely be done by the VM thread | |
| 404 // | |
| 405 // I'm told that in 1.5 oop maps are now protected by a lock and | |
| 406 // we could get rid of the VM op | |
| 407 // However if the VM op is removed then the target thread must | |
| 408 // be suspended AND a lock will be needed to prevent concurrent | |
| 409 // setting of locals to the same java thread. This lock is needed | |
| 410 // to prevent compiledVFrames from trying to add deferred updates | |
| 411 // to the thread simultaneously. | |
| 412 // | |
| 413 class VM_GetOrSetLocal : public VM_Operation { | |
| 414 private: | |
| 415 JavaThread* _thread; | |
| 416 JavaThread* _calling_thread; | |
| 417 jint _depth; | |
| 418 jint _index; | |
| 419 BasicType _type; | |
| 420 jvalue _value; | |
| 421 javaVFrame* _jvf; | |
| 422 bool _set; | |
| 423 | |
| 424 jvmtiError _result; | |
| 425 | |
| 426 vframe* get_vframe(); | |
| 427 javaVFrame* get_java_vframe(); | |
| 428 bool check_slot_type(javaVFrame* vf); | |
| 429 | |
| 430 public: | |
| 431 // Constructor for non-object getter | |
| 432 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type); | |
| 433 | |
| 434 // Constructor for object or non-object setter | |
| 435 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type, jvalue value); | |
| 436 | |
| 437 // Constructor for object getter | |
| 438 VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, | |
| 439 int index); | |
| 440 | |
| 441 VMOp_Type type() const { return VMOp_GetOrSetLocal; } | |
| 442 jvalue value() { return _value; } | |
| 443 jvmtiError result() { return _result; } | |
| 444 | |
| 445 bool doit_prologue(); | |
| 446 void doit(); | |
| 447 bool allow_nested_vm_operations() const; | |
| 448 const char* name() const { return "get/set locals"; } | |
| 449 | |
| 450 // Check that the klass is assignable to a type with the given signature. | |
| 451 static bool is_assignable(const char* ty_sign, Klass* klass, Thread* thread); | |
| 452 }; | |
| 453 | |
| 454 | |
| 455 /////////////////////////////////////////////////////////////// | |
| 456 // | |
| 457 // class JvmtiSuspendControl | |
| 458 // | |
| 459 // Convenience routines for suspending and resuming threads. | |
| 460 // | |
| 461 // All attempts by JVMTI to suspend and resume threads must go through the | |
| 462 // JvmtiSuspendControl interface. | |
| 463 // | |
| 464 // methods return true if successful | |
| 465 // | |
| 466 class JvmtiSuspendControl : public AllStatic { | |
| 467 public: | |
| 468 // suspend the thread, taking it to a safepoint | |
| 469 static bool suspend(JavaThread *java_thread); | |
| 470 // resume the thread | |
| 471 static bool resume(JavaThread *java_thread); | |
| 472 | |
| 473 static void print(); | |
| 474 }; | |
| 475 | |
| 476 // Utility macro that checks for NULL pointers: | |
| 477 #define NULL_CHECK(X, Y) if ((X) == NULL) { return (Y); } |