Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiTagMap.cpp @ 3363:167b70ff3abc
6939861: JVM should handle more conversion operations
Reviewed-by: twisti, jrose
| author | never |
|---|---|
| date | Fri, 06 May 2011 16:33:13 -0700 |
| parents | 57552dca1708 |
| children | d425748f2203 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2011, 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 #include "precompiled.hpp" |
| 26 #include "classfile/symbolTable.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "classfile/vmSymbols.hpp" | |
| 29 #include "jvmtifiles/jvmtiEnv.hpp" | |
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30 #include "oops/instanceMirrorKlass.hpp" |
| 1972 | 31 #include "oops/objArrayKlass.hpp" |
| 32 #include "oops/oop.inline2.hpp" | |
| 33 #include "prims/jvmtiEventController.hpp" | |
| 34 #include "prims/jvmtiEventController.inline.hpp" | |
| 35 #include "prims/jvmtiExport.hpp" | |
| 36 #include "prims/jvmtiImpl.hpp" | |
| 37 #include "prims/jvmtiTagMap.hpp" | |
| 38 #include "runtime/biasedLocking.hpp" | |
| 39 #include "runtime/javaCalls.hpp" | |
| 40 #include "runtime/jniHandles.hpp" | |
| 41 #include "runtime/mutex.hpp" | |
| 42 #include "runtime/mutexLocker.hpp" | |
| 43 #include "runtime/reflectionUtils.hpp" | |
| 44 #include "runtime/vframe.hpp" | |
| 45 #include "runtime/vmThread.hpp" | |
| 46 #include "runtime/vm_operations.hpp" | |
| 47 #include "services/serviceUtil.hpp" | |
| 48 #ifndef SERIALGC | |
| 49 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
| 50 #endif | |
| 0 | 51 |
| 52 // JvmtiTagHashmapEntry | |
| 53 // | |
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54 // Each entry encapsulates a reference to the tagged object |
| 0 | 55 // and the tag value. In addition an entry includes a next pointer which |
| 56 // is used to chain entries together. | |
| 57 | |
| 58 class JvmtiTagHashmapEntry : public CHeapObj { | |
| 59 private: | |
| 60 friend class JvmtiTagMap; | |
| 61 | |
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62 oop _object; // tagged object |
| 0 | 63 jlong _tag; // the tag |
| 64 JvmtiTagHashmapEntry* _next; // next on the list | |
| 65 | |
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66 inline void init(oop object, jlong tag) { |
| 0 | 67 _object = object; |
| 68 _tag = tag; | |
| 69 _next = NULL; | |
| 70 } | |
| 71 | |
| 72 // constructor | |
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73 JvmtiTagHashmapEntry(oop object, jlong tag) { init(object, tag); } |
| 0 | 74 |
| 75 public: | |
| 76 | |
| 77 // accessor methods | |
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78 inline oop object() const { return _object; } |
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79 inline oop* object_addr() { return &_object; } |
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80 inline jlong tag() const { return _tag; } |
| 0 | 81 |
| 82 inline void set_tag(jlong tag) { | |
| 83 assert(tag != 0, "can't be zero"); | |
| 84 _tag = tag; | |
| 85 } | |
| 86 | |
| 87 inline JvmtiTagHashmapEntry* next() const { return _next; } | |
| 88 inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; } | |
| 89 }; | |
| 90 | |
| 91 | |
| 92 // JvmtiTagHashmap | |
| 93 // | |
| 94 // A hashmap is essentially a table of pointers to entries. Entries | |
| 95 // are hashed to a location, or position in the table, and then | |
| 96 // chained from that location. The "key" for hashing is address of | |
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97 // the object, or oop. The "value" is the tag value. |
| 0 | 98 // |
| 99 // A hashmap maintains a count of the number entries in the hashmap | |
| 100 // and resizes if the number of entries exceeds a given threshold. | |
| 101 // The threshold is specified as a percentage of the size - for | |
| 102 // example a threshold of 0.75 will trigger the hashmap to resize | |
| 103 // if the number of entries is >75% of table size. | |
| 104 // | |
| 105 // A hashmap provides functions for adding, removing, and finding | |
| 106 // entries. It also provides a function to iterate over all entries | |
| 107 // in the hashmap. | |
| 108 | |
| 109 class JvmtiTagHashmap : public CHeapObj { | |
| 110 private: | |
| 111 friend class JvmtiTagMap; | |
| 112 | |
| 113 enum { | |
| 114 small_trace_threshold = 10000, // threshold for tracing | |
| 115 medium_trace_threshold = 100000, | |
| 116 large_trace_threshold = 1000000, | |
| 117 initial_trace_threshold = small_trace_threshold | |
| 118 }; | |
| 119 | |
| 120 static int _sizes[]; // array of possible hashmap sizes | |
| 121 int _size; // actual size of the table | |
| 122 int _size_index; // index into size table | |
| 123 | |
| 124 int _entry_count; // number of entries in the hashmap | |
| 125 | |
| 126 float _load_factor; // load factor as a % of the size | |
| 127 int _resize_threshold; // computed threshold to trigger resizing. | |
| 128 bool _resizing_enabled; // indicates if hashmap can resize | |
| 129 | |
| 130 int _trace_threshold; // threshold for trace messages | |
| 131 | |
| 132 JvmtiTagHashmapEntry** _table; // the table of entries. | |
| 133 | |
| 134 // private accessors | |
| 135 int resize_threshold() const { return _resize_threshold; } | |
| 136 int trace_threshold() const { return _trace_threshold; } | |
| 137 | |
| 138 // initialize the hashmap | |
| 139 void init(int size_index=0, float load_factor=4.0f) { | |
| 140 int initial_size = _sizes[size_index]; | |
| 141 _size_index = size_index; | |
| 142 _size = initial_size; | |
| 143 _entry_count = 0; | |
| 144 if (TraceJVMTIObjectTagging) { | |
| 145 _trace_threshold = initial_trace_threshold; | |
| 146 } else { | |
| 147 _trace_threshold = -1; | |
| 148 } | |
| 149 _load_factor = load_factor; | |
| 150 _resize_threshold = (int)(_load_factor * _size); | |
| 151 _resizing_enabled = true; | |
| 152 size_t s = initial_size * sizeof(JvmtiTagHashmapEntry*); | |
| 153 _table = (JvmtiTagHashmapEntry**)os::malloc(s); | |
| 154 if (_table == NULL) { | |
| 155 vm_exit_out_of_memory(s, "unable to allocate initial hashtable for jvmti object tags"); | |
| 156 } | |
| 157 for (int i=0; i<initial_size; i++) { | |
| 158 _table[i] = NULL; | |
| 159 } | |
| 160 } | |
| 161 | |
| 162 // hash a given key (oop) with the specified size | |
| 163 static unsigned int hash(oop key, int size) { | |
| 164 // shift right to get better distribution (as these bits will be zero | |
| 165 // with aligned addresses) | |
| 166 unsigned int addr = (unsigned int)((intptr_t)key); | |
| 167 #ifdef _LP64 | |
| 168 return (addr >> 3) % size; | |
| 169 #else | |
| 170 return (addr >> 2) % size; | |
| 171 #endif | |
| 172 } | |
| 173 | |
| 174 // hash a given key (oop) | |
| 175 unsigned int hash(oop key) { | |
| 176 return hash(key, _size); | |
| 177 } | |
| 178 | |
| 179 // resize the hashmap - allocates a large table and re-hashes | |
| 180 // all entries into the new table. | |
| 181 void resize() { | |
| 182 int new_size_index = _size_index+1; | |
| 183 int new_size = _sizes[new_size_index]; | |
| 184 if (new_size < 0) { | |
| 185 // hashmap already at maximum capacity | |
| 186 return; | |
| 187 } | |
| 188 | |
| 189 // allocate new table | |
| 190 size_t s = new_size * sizeof(JvmtiTagHashmapEntry*); | |
| 191 JvmtiTagHashmapEntry** new_table = (JvmtiTagHashmapEntry**)os::malloc(s); | |
| 192 if (new_table == NULL) { | |
| 193 warning("unable to allocate larger hashtable for jvmti object tags"); | |
| 194 set_resizing_enabled(false); | |
| 195 return; | |
| 196 } | |
| 197 | |
| 198 // initialize new table | |
| 199 int i; | |
| 200 for (i=0; i<new_size; i++) { | |
| 201 new_table[i] = NULL; | |
| 202 } | |
| 203 | |
| 204 // rehash all entries into the new table | |
| 205 for (i=0; i<_size; i++) { | |
| 206 JvmtiTagHashmapEntry* entry = _table[i]; | |
| 207 while (entry != NULL) { | |
| 208 JvmtiTagHashmapEntry* next = entry->next(); | |
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209 oop key = entry->object(); |
| 0 | 210 assert(key != NULL, "jni weak reference cleared!!"); |
| 211 unsigned int h = hash(key, new_size); | |
| 212 JvmtiTagHashmapEntry* anchor = new_table[h]; | |
| 213 if (anchor == NULL) { | |
| 214 new_table[h] = entry; | |
| 215 entry->set_next(NULL); | |
| 216 } else { | |
| 217 entry->set_next(anchor); | |
| 218 new_table[h] = entry; | |
| 219 } | |
| 220 entry = next; | |
| 221 } | |
| 222 } | |
| 223 | |
| 224 // free old table and update settings. | |
| 225 os::free((void*)_table); | |
| 226 _table = new_table; | |
| 227 _size_index = new_size_index; | |
| 228 _size = new_size; | |
| 229 | |
| 230 // compute new resize threshold | |
| 231 _resize_threshold = (int)(_load_factor * _size); | |
| 232 } | |
| 233 | |
| 234 | |
| 235 // internal remove function - remove an entry at a given position in the | |
| 236 // table. | |
| 237 inline void remove(JvmtiTagHashmapEntry* prev, int pos, JvmtiTagHashmapEntry* entry) { | |
| 238 assert(pos >= 0 && pos < _size, "out of range"); | |
| 239 if (prev == NULL) { | |
| 240 _table[pos] = entry->next(); | |
| 241 } else { | |
| 242 prev->set_next(entry->next()); | |
| 243 } | |
| 244 assert(_entry_count > 0, "checking"); | |
| 245 _entry_count--; | |
| 246 } | |
| 247 | |
| 248 // resizing switch | |
| 249 bool is_resizing_enabled() const { return _resizing_enabled; } | |
| 250 void set_resizing_enabled(bool enable) { _resizing_enabled = enable; } | |
| 251 | |
| 252 // debugging | |
| 253 void print_memory_usage(); | |
| 254 void compute_next_trace_threshold(); | |
| 255 | |
| 256 public: | |
| 257 | |
| 258 // create a JvmtiTagHashmap of a preferred size and optionally a load factor. | |
| 259 // The preferred size is rounded down to an actual size. | |
| 260 JvmtiTagHashmap(int size, float load_factor=0.0f) { | |
| 261 int i=0; | |
| 262 while (_sizes[i] < size) { | |
| 263 if (_sizes[i] < 0) { | |
| 264 assert(i > 0, "sanity check"); | |
| 265 i--; | |
| 266 break; | |
| 267 } | |
| 268 i++; | |
| 269 } | |
| 270 | |
| 271 // if a load factor is specified then use it, otherwise use default | |
| 272 if (load_factor > 0.01f) { | |
| 273 init(i, load_factor); | |
| 274 } else { | |
| 275 init(i); | |
| 276 } | |
| 277 } | |
| 278 | |
| 279 // create a JvmtiTagHashmap with default settings | |
| 280 JvmtiTagHashmap() { | |
| 281 init(); | |
| 282 } | |
| 283 | |
| 284 // release table when JvmtiTagHashmap destroyed | |
| 285 ~JvmtiTagHashmap() { | |
| 286 if (_table != NULL) { | |
| 287 os::free((void*)_table); | |
| 288 _table = NULL; | |
| 289 } | |
| 290 } | |
| 291 | |
| 292 // accessors | |
| 293 int size() const { return _size; } | |
| 294 JvmtiTagHashmapEntry** table() const { return _table; } | |
| 295 int entry_count() const { return _entry_count; } | |
| 296 | |
| 297 // find an entry in the hashmap, returns NULL if not found. | |
| 298 inline JvmtiTagHashmapEntry* find(oop key) { | |
| 299 unsigned int h = hash(key); | |
| 300 JvmtiTagHashmapEntry* entry = _table[h]; | |
| 301 while (entry != NULL) { | |
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302 if (entry->object() == key) { |
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303 return entry; |
| 0 | 304 } |
| 305 entry = entry->next(); | |
| 306 } | |
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307 return NULL; |
| 0 | 308 } |
| 309 | |
| 310 | |
| 311 // add a new entry to hashmap | |
| 312 inline void add(oop key, JvmtiTagHashmapEntry* entry) { | |
| 313 assert(key != NULL, "checking"); | |
| 314 assert(find(key) == NULL, "duplicate detected"); | |
| 315 unsigned int h = hash(key); | |
| 316 JvmtiTagHashmapEntry* anchor = _table[h]; | |
| 317 if (anchor == NULL) { | |
| 318 _table[h] = entry; | |
| 319 entry->set_next(NULL); | |
| 320 } else { | |
| 321 entry->set_next(anchor); | |
| 322 _table[h] = entry; | |
| 323 } | |
| 324 | |
| 325 _entry_count++; | |
| 326 if (trace_threshold() > 0 && entry_count() >= trace_threshold()) { | |
| 327 assert(TraceJVMTIObjectTagging, "should only get here when tracing"); | |
| 328 print_memory_usage(); | |
| 329 compute_next_trace_threshold(); | |
| 330 } | |
| 331 | |
| 332 // if the number of entries exceed the threshold then resize | |
| 333 if (entry_count() > resize_threshold() && is_resizing_enabled()) { | |
| 334 resize(); | |
| 335 } | |
| 336 } | |
| 337 | |
| 338 // remove an entry with the given key. | |
| 339 inline JvmtiTagHashmapEntry* remove(oop key) { | |
| 340 unsigned int h = hash(key); | |
| 341 JvmtiTagHashmapEntry* entry = _table[h]; | |
| 342 JvmtiTagHashmapEntry* prev = NULL; | |
| 343 while (entry != NULL) { | |
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344 if (key == entry->object()) { |
| 0 | 345 break; |
| 346 } | |
| 347 prev = entry; | |
| 348 entry = entry->next(); | |
| 349 } | |
| 350 if (entry != NULL) { | |
| 351 remove(prev, h, entry); | |
| 352 } | |
| 353 return entry; | |
| 354 } | |
| 355 | |
| 356 // iterate over all entries in the hashmap | |
| 357 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); | |
| 358 }; | |
| 359 | |
| 360 // possible hashmap sizes - odd primes that roughly double in size. | |
| 361 // To avoid excessive resizing the odd primes from 4801-76831 and | |
| 362 // 76831-307261 have been removed. The list must be terminated by -1. | |
| 363 int JvmtiTagHashmap::_sizes[] = { 4801, 76831, 307261, 614563, 1228891, | |
| 364 2457733, 4915219, 9830479, 19660831, 39321619, 78643219, -1 }; | |
| 365 | |
| 366 | |
| 367 // A supporting class for iterating over all entries in Hashmap | |
| 368 class JvmtiTagHashmapEntryClosure { | |
| 369 public: | |
| 370 virtual void do_entry(JvmtiTagHashmapEntry* entry) = 0; | |
| 371 }; | |
| 372 | |
| 373 | |
| 374 // iterate over all entries in the hashmap | |
| 375 void JvmtiTagHashmap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
| 376 for (int i=0; i<_size; i++) { | |
| 377 JvmtiTagHashmapEntry* entry = _table[i]; | |
| 378 JvmtiTagHashmapEntry* prev = NULL; | |
| 379 while (entry != NULL) { | |
| 380 // obtain the next entry before invoking do_entry - this is | |
| 381 // necessary because do_entry may remove the entry from the | |
| 382 // hashmap. | |
| 383 JvmtiTagHashmapEntry* next = entry->next(); | |
| 384 closure->do_entry(entry); | |
| 385 entry = next; | |
| 386 } | |
| 387 } | |
| 388 } | |
| 389 | |
| 390 // debugging | |
| 391 void JvmtiTagHashmap::print_memory_usage() { | |
| 392 intptr_t p = (intptr_t)this; | |
| 393 tty->print("[JvmtiTagHashmap @ " INTPTR_FORMAT, p); | |
| 394 | |
| 395 // table + entries in KB | |
| 396 int hashmap_usage = (size()*sizeof(JvmtiTagHashmapEntry*) + | |
| 397 entry_count()*sizeof(JvmtiTagHashmapEntry))/K; | |
| 398 | |
| 399 int weak_globals_usage = (int)(JNIHandles::weak_global_handle_memory_usage()/K); | |
| 400 tty->print_cr(", %d entries (%d KB) <JNI weak globals: %d KB>]", | |
| 401 entry_count(), hashmap_usage, weak_globals_usage); | |
| 402 } | |
| 403 | |
| 404 // compute threshold for the next trace message | |
| 405 void JvmtiTagHashmap::compute_next_trace_threshold() { | |
| 406 if (trace_threshold() < medium_trace_threshold) { | |
| 407 _trace_threshold += small_trace_threshold; | |
| 408 } else { | |
| 409 if (trace_threshold() < large_trace_threshold) { | |
| 410 _trace_threshold += medium_trace_threshold; | |
| 411 } else { | |
| 412 _trace_threshold += large_trace_threshold; | |
| 413 } | |
| 414 } | |
| 415 } | |
| 416 | |
| 417 // create a JvmtiTagMap | |
| 418 JvmtiTagMap::JvmtiTagMap(JvmtiEnv* env) : | |
| 419 _env(env), | |
| 420 _lock(Mutex::nonleaf+2, "JvmtiTagMap._lock", false), | |
| 421 _free_entries(NULL), | |
| 422 _free_entries_count(0) | |
| 423 { | |
| 424 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 425 assert(((JvmtiEnvBase *)env)->tag_map() == NULL, "tag map already exists for environment"); | |
| 426 | |
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427 _hashmap = new JvmtiTagHashmap(); |
| 0 | 428 |
| 429 // finally add us to the environment | |
| 430 ((JvmtiEnvBase *)env)->set_tag_map(this); | |
| 431 } | |
| 432 | |
| 433 | |
| 434 // destroy a JvmtiTagMap | |
| 435 JvmtiTagMap::~JvmtiTagMap() { | |
| 436 | |
| 437 // no lock acquired as we assume the enclosing environment is | |
| 438 // also being destroryed. | |
| 439 ((JvmtiEnvBase *)_env)->set_tag_map(NULL); | |
| 440 | |
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441 JvmtiTagHashmapEntry** table = _hashmap->table(); |
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442 for (int j = 0; j < _hashmap->size(); j++) { |
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443 JvmtiTagHashmapEntry* entry = table[j]; |
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444 while (entry != NULL) { |
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445 JvmtiTagHashmapEntry* next = entry->next(); |
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446 delete entry; |
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447 entry = next; |
| 0 | 448 } |
| 449 } | |
| 450 | |
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451 // finally destroy the hashmap |
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452 delete _hashmap; |
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453 _hashmap = NULL; |
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454 |
| 0 | 455 // remove any entries on the free list |
| 456 JvmtiTagHashmapEntry* entry = _free_entries; | |
| 457 while (entry != NULL) { | |
| 458 JvmtiTagHashmapEntry* next = entry->next(); | |
| 459 delete entry; | |
| 460 entry = next; | |
| 461 } | |
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462 _free_entries = NULL; |
| 0 | 463 } |
| 464 | |
| 465 // create a hashmap entry | |
| 466 // - if there's an entry on the (per-environment) free list then this | |
| 467 // is returned. Otherwise an new entry is allocated. | |
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468 JvmtiTagHashmapEntry* JvmtiTagMap::create_entry(oop ref, jlong tag) { |
| 0 | 469 assert(Thread::current()->is_VM_thread() || is_locked(), "checking"); |
| 470 JvmtiTagHashmapEntry* entry; | |
| 471 if (_free_entries == NULL) { | |
| 472 entry = new JvmtiTagHashmapEntry(ref, tag); | |
| 473 } else { | |
| 474 assert(_free_entries_count > 0, "mismatched _free_entries_count"); | |
| 475 _free_entries_count--; | |
| 476 entry = _free_entries; | |
| 477 _free_entries = entry->next(); | |
| 478 entry->init(ref, tag); | |
| 479 } | |
| 480 return entry; | |
| 481 } | |
| 482 | |
| 483 // destroy an entry by returning it to the free list | |
| 484 void JvmtiTagMap::destroy_entry(JvmtiTagHashmapEntry* entry) { | |
| 485 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
| 486 // limit the size of the free list | |
| 487 if (_free_entries_count >= max_free_entries) { | |
| 488 delete entry; | |
| 489 } else { | |
| 490 entry->set_next(_free_entries); | |
| 491 _free_entries = entry; | |
| 492 _free_entries_count++; | |
| 493 } | |
| 494 } | |
| 495 | |
| 496 // returns the tag map for the given environments. If the tag map | |
| 497 // doesn't exist then it is created. | |
| 498 JvmtiTagMap* JvmtiTagMap::tag_map_for(JvmtiEnv* env) { | |
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499 JvmtiTagMap* tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
| 0 | 500 if (tag_map == NULL) { |
| 501 MutexLocker mu(JvmtiThreadState_lock); | |
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502 tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
| 0 | 503 if (tag_map == NULL) { |
| 504 tag_map = new JvmtiTagMap(env); | |
| 505 } | |
| 506 } else { | |
| 507 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
| 508 } | |
| 509 return tag_map; | |
| 510 } | |
| 511 | |
| 512 // iterate over all entries in the tag map. | |
| 513 void JvmtiTagMap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
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514 hashmap()->entry_iterate(closure); |
| 0 | 515 } |
| 516 | |
| 517 // returns true if the hashmaps are empty | |
| 518 bool JvmtiTagMap::is_empty() { | |
| 519 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
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520 return hashmap()->entry_count() == 0; |
| 0 | 521 } |
| 522 | |
| 523 | |
| 524 // Return the tag value for an object, or 0 if the object is | |
| 525 // not tagged | |
| 526 // | |
| 527 static inline jlong tag_for(JvmtiTagMap* tag_map, oop o) { | |
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528 JvmtiTagHashmapEntry* entry = tag_map->hashmap()->find(o); |
| 0 | 529 if (entry == NULL) { |
| 530 return 0; | |
| 531 } else { | |
| 532 return entry->tag(); | |
| 533 } | |
| 534 } | |
| 535 | |
| 536 // If the object is a java.lang.Class then return the klassOop, | |
| 537 // otherwise return the original object | |
| 538 static inline oop klassOop_if_java_lang_Class(oop o) { | |
| 1142 | 539 if (o->klass() == SystemDictionary::Class_klass()) { |
| 0 | 540 if (!java_lang_Class::is_primitive(o)) { |
| 541 o = (oop)java_lang_Class::as_klassOop(o); | |
| 542 assert(o != NULL, "class for non-primitive mirror must exist"); | |
| 543 } | |
| 544 } | |
| 545 return o; | |
| 546 } | |
| 547 | |
| 548 // A CallbackWrapper is a support class for querying and tagging an object | |
| 549 // around a callback to a profiler. The constructor does pre-callback | |
| 550 // work to get the tag value, klass tag value, ... and the destructor | |
| 551 // does the post-callback work of tagging or untagging the object. | |
| 552 // | |
| 553 // { | |
| 554 // CallbackWrapper wrapper(tag_map, o); | |
| 555 // | |
| 556 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
| 557 // | |
| 558 // } // wrapper goes out of scope here which results in the destructor | |
| 559 // checking to see if the object has been tagged, untagged, or the | |
| 560 // tag value has changed. | |
| 561 // | |
| 562 class CallbackWrapper : public StackObj { | |
| 563 private: | |
| 564 JvmtiTagMap* _tag_map; | |
| 565 JvmtiTagHashmap* _hashmap; | |
| 566 JvmtiTagHashmapEntry* _entry; | |
| 567 oop _o; | |
| 568 jlong _obj_size; | |
| 569 jlong _obj_tag; | |
| 570 klassOop _klass; // the object's class | |
| 571 jlong _klass_tag; | |
| 572 | |
| 573 protected: | |
| 574 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 575 | |
| 576 // invoked post-callback to tag, untag, or update the tag of an object | |
| 577 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
| 578 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
| 579 public: | |
| 580 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
| 581 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
| 582 "MT unsafe or must be VM thread"); | |
| 583 | |
| 584 // for Classes the klassOop is tagged | |
| 585 _o = klassOop_if_java_lang_Class(o); | |
| 586 | |
| 587 // object size | |
| 588 _obj_size = _o->size() * wordSize; | |
| 589 | |
| 590 // record the context | |
| 591 _tag_map = tag_map; | |
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592 _hashmap = tag_map->hashmap(); |
| 0 | 593 _entry = _hashmap->find(_o); |
| 594 | |
| 595 // get object tag | |
| 596 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
| 597 | |
| 598 // get the class and the class's tag value | |
| 599 if (_o == o) { | |
| 600 _klass = _o->klass(); | |
| 601 } else { | |
| 602 // if the object represents a runtime class then use the | |
| 603 // tag for java.lang.Class | |
| 1142 | 604 _klass = SystemDictionary::Class_klass(); |
| 0 | 605 } |
| 606 _klass_tag = tag_for(tag_map, _klass); | |
| 607 } | |
| 608 | |
| 609 ~CallbackWrapper() { | |
| 610 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
| 611 } | |
| 612 | |
| 613 inline jlong* obj_tag_p() { return &_obj_tag; } | |
| 614 inline jlong obj_size() const { return _obj_size; } | |
| 615 inline jlong obj_tag() const { return _obj_tag; } | |
| 616 inline klassOop klass() const { return _klass; } | |
| 617 inline jlong klass_tag() const { return _klass_tag; } | |
| 618 }; | |
| 619 | |
| 620 | |
| 621 | |
| 622 // callback post-callback to tag, untag, or update the tag of an object | |
| 623 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
| 624 JvmtiTagHashmap* hashmap, | |
| 625 JvmtiTagHashmapEntry* entry, | |
| 626 jlong obj_tag) { | |
| 627 if (entry == NULL) { | |
| 628 if (obj_tag != 0) { | |
| 629 // callback has tagged the object | |
| 630 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
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631 entry = tag_map()->create_entry(o, obj_tag); |
| 0 | 632 hashmap->add(o, entry); |
| 633 } | |
| 634 } else { | |
| 635 // object was previously tagged - the callback may have untagged | |
| 636 // the object or changed the tag value | |
| 637 if (obj_tag == 0) { | |
| 638 | |
| 639 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
| 640 assert(entry_removed == entry, "checking"); | |
| 641 tag_map()->destroy_entry(entry); | |
| 642 | |
| 643 } else { | |
| 644 if (obj_tag != entry->tag()) { | |
| 645 entry->set_tag(obj_tag); | |
| 646 } | |
| 647 } | |
| 648 } | |
| 649 } | |
| 650 | |
| 651 // An extended CallbackWrapper used when reporting an object reference | |
| 652 // to the agent. | |
| 653 // | |
| 654 // { | |
| 655 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
| 656 // | |
| 657 // (*callback)(wrapper.klass_tag(), | |
| 658 // wrapper.obj_size(), | |
| 659 // wrapper.obj_tag_p() | |
| 660 // wrapper.referrer_tag_p(), ...) | |
| 661 // | |
| 662 // } // wrapper goes out of scope here which results in the destructor | |
| 663 // checking to see if the referrer object has been tagged, untagged, | |
| 664 // or the tag value has changed. | |
| 665 // | |
| 666 class TwoOopCallbackWrapper : public CallbackWrapper { | |
| 667 private: | |
| 668 bool _is_reference_to_self; | |
| 669 JvmtiTagHashmap* _referrer_hashmap; | |
| 670 JvmtiTagHashmapEntry* _referrer_entry; | |
| 671 oop _referrer; | |
| 672 jlong _referrer_obj_tag; | |
| 673 jlong _referrer_klass_tag; | |
| 674 jlong* _referrer_tag_p; | |
| 675 | |
| 676 bool is_reference_to_self() const { return _is_reference_to_self; } | |
| 677 | |
| 678 public: | |
| 679 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
| 680 CallbackWrapper(tag_map, o) | |
| 681 { | |
| 682 // self reference needs to be handled in a special way | |
| 683 _is_reference_to_self = (referrer == o); | |
| 684 | |
| 685 if (_is_reference_to_self) { | |
| 686 _referrer_klass_tag = klass_tag(); | |
| 687 _referrer_tag_p = obj_tag_p(); | |
| 688 } else { | |
| 689 // for Classes the klassOop is tagged | |
| 690 _referrer = klassOop_if_java_lang_Class(referrer); | |
| 691 // record the context | |
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692 _referrer_hashmap = tag_map->hashmap(); |
| 0 | 693 _referrer_entry = _referrer_hashmap->find(_referrer); |
| 694 | |
| 695 // get object tag | |
| 696 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
| 697 _referrer_tag_p = &_referrer_obj_tag; | |
| 698 | |
| 699 // get referrer class tag. | |
| 700 klassOop k = (_referrer == referrer) ? // Check if referrer is a class... | |
| 701 _referrer->klass() // No, just get its class | |
| 1142 | 702 : SystemDictionary::Class_klass(); // Yes, its class is Class |
| 0 | 703 _referrer_klass_tag = tag_for(tag_map, k); |
| 704 } | |
| 705 } | |
| 706 | |
| 707 ~TwoOopCallbackWrapper() { | |
| 708 if (!is_reference_to_self()){ | |
| 709 post_callback_tag_update(_referrer, | |
| 710 _referrer_hashmap, | |
| 711 _referrer_entry, | |
| 712 _referrer_obj_tag); | |
| 713 } | |
| 714 } | |
| 715 | |
| 716 // address of referrer tag | |
| 717 // (for a self reference this will return the same thing as obj_tag_p()) | |
| 718 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
| 719 | |
| 720 // referrer's class tag | |
| 721 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
| 722 }; | |
| 723 | |
| 724 // tag an object | |
| 725 // | |
| 726 // This function is performance critical. If many threads attempt to tag objects | |
| 727 // around the same time then it's possible that the Mutex associated with the | |
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728 // tag map will be a hot lock. |
| 0 | 729 void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
| 730 MutexLocker ml(lock()); | |
| 731 | |
| 732 // resolve the object | |
| 733 oop o = JNIHandles::resolve_non_null(object); | |
| 734 | |
| 735 // for Classes we tag the klassOop | |
| 736 o = klassOop_if_java_lang_Class(o); | |
| 737 | |
| 738 // see if the object is already tagged | |
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739 JvmtiTagHashmap* hashmap = _hashmap; |
| 0 | 740 JvmtiTagHashmapEntry* entry = hashmap->find(o); |
| 741 | |
| 742 // if the object is not already tagged then we tag it | |
| 743 if (entry == NULL) { | |
| 744 if (tag != 0) { | |
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745 entry = create_entry(o, tag); |
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746 hashmap->add(o, entry); |
| 0 | 747 } else { |
| 748 // no-op | |
| 749 } | |
| 750 } else { | |
| 751 // if the object is already tagged then we either update | |
| 752 // the tag (if a new tag value has been provided) | |
| 753 // or remove the object if the new tag value is 0. | |
| 754 if (tag == 0) { | |
| 755 hashmap->remove(o); | |
| 756 destroy_entry(entry); | |
| 757 } else { | |
| 758 entry->set_tag(tag); | |
| 759 } | |
| 760 } | |
| 761 } | |
| 762 | |
| 763 // get the tag for an object | |
| 764 jlong JvmtiTagMap::get_tag(jobject object) { | |
| 765 MutexLocker ml(lock()); | |
| 766 | |
| 767 // resolve the object | |
| 768 oop o = JNIHandles::resolve_non_null(object); | |
| 769 | |
| 770 // for Classes get the tag from the klassOop | |
| 771 return tag_for(this, klassOop_if_java_lang_Class(o)); | |
| 772 } | |
| 773 | |
| 774 | |
| 775 // Helper class used to describe the static or instance fields of a class. | |
| 776 // For each field it holds the field index (as defined by the JVMTI specification), | |
| 777 // the field type, and the offset. | |
| 778 | |
| 779 class ClassFieldDescriptor: public CHeapObj { | |
| 780 private: | |
| 781 int _field_index; | |
| 782 int _field_offset; | |
| 783 char _field_type; | |
| 784 public: | |
| 785 ClassFieldDescriptor(int index, char type, int offset) : | |
| 786 _field_index(index), _field_type(type), _field_offset(offset) { | |
| 787 } | |
| 788 int field_index() const { return _field_index; } | |
| 789 char field_type() const { return _field_type; } | |
| 790 int field_offset() const { return _field_offset; } | |
| 791 }; | |
| 792 | |
| 793 class ClassFieldMap: public CHeapObj { | |
| 794 private: | |
| 795 enum { | |
| 796 initial_field_count = 5 | |
| 797 }; | |
| 798 | |
| 799 // list of field descriptors | |
| 800 GrowableArray<ClassFieldDescriptor*>* _fields; | |
| 801 | |
| 802 // constructor | |
| 803 ClassFieldMap(); | |
| 804 | |
| 805 // add a field | |
| 806 void add(int index, char type, int offset); | |
| 807 | |
| 808 // returns the field count for the given class | |
| 809 static int compute_field_count(instanceKlassHandle ikh); | |
| 810 | |
| 811 public: | |
| 812 ~ClassFieldMap(); | |
| 813 | |
| 814 // access | |
| 815 int field_count() { return _fields->length(); } | |
| 816 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
| 817 | |
| 818 // functions to create maps of static or instance fields | |
| 819 static ClassFieldMap* create_map_of_static_fields(klassOop k); | |
| 820 static ClassFieldMap* create_map_of_instance_fields(oop obj); | |
| 821 }; | |
| 822 | |
| 823 ClassFieldMap::ClassFieldMap() { | |
| 824 _fields = new (ResourceObj::C_HEAP) GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
| 825 } | |
| 826 | |
| 827 ClassFieldMap::~ClassFieldMap() { | |
| 828 for (int i=0; i<_fields->length(); i++) { | |
| 829 delete _fields->at(i); | |
| 830 } | |
| 831 delete _fields; | |
| 832 } | |
| 833 | |
| 834 void ClassFieldMap::add(int index, char type, int offset) { | |
| 835 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
| 836 _fields->append(field); | |
| 837 } | |
| 838 | |
| 839 // Returns a heap allocated ClassFieldMap to describe the static fields | |
| 840 // of the given class. | |
| 841 // | |
| 842 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(klassOop k) { | |
| 843 HandleMark hm; | |
| 844 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
| 845 | |
| 846 // create the field map | |
| 847 ClassFieldMap* field_map = new ClassFieldMap(); | |
| 848 | |
| 849 FilteredFieldStream f(ikh, false, false); | |
| 850 int max_field_index = f.field_count()-1; | |
| 851 | |
| 852 int index = 0; | |
| 853 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
| 854 // ignore instance fields | |
| 855 if (!fld.access_flags().is_static()) { | |
| 856 continue; | |
| 857 } | |
| 858 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
| 859 } | |
| 860 return field_map; | |
| 861 } | |
| 862 | |
| 863 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
| 864 // of the given class. All instance fields are included (this means public | |
| 865 // and private fields declared in superclasses and superinterfaces too). | |
| 866 // | |
| 867 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
| 868 HandleMark hm; | |
| 869 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
| 870 | |
| 871 // create the field map | |
| 872 ClassFieldMap* field_map = new ClassFieldMap(); | |
| 873 | |
| 874 FilteredFieldStream f(ikh, false, false); | |
| 875 | |
| 876 int max_field_index = f.field_count()-1; | |
| 877 | |
| 878 int index = 0; | |
| 879 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
| 880 // ignore static fields | |
| 881 if (fld.access_flags().is_static()) { | |
| 882 continue; | |
| 883 } | |
| 884 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
| 885 } | |
| 886 | |
| 887 return field_map; | |
| 888 } | |
| 889 | |
| 890 // Helper class used to cache a ClassFileMap for the instance fields of | |
| 891 // a cache. A JvmtiCachedClassFieldMap can be cached by an instanceKlass during | |
| 892 // heap iteration and avoid creating a field map for each object in the heap | |
| 893 // (only need to create the map when the first instance of a class is encountered). | |
| 894 // | |
| 895 class JvmtiCachedClassFieldMap : public CHeapObj { | |
| 896 private: | |
| 897 enum { | |
| 898 initial_class_count = 200 | |
| 899 }; | |
| 900 ClassFieldMap* _field_map; | |
| 901 | |
| 902 ClassFieldMap* field_map() const { return _field_map; } | |
| 903 | |
| 904 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
| 905 ~JvmtiCachedClassFieldMap(); | |
| 906 | |
| 907 static GrowableArray<instanceKlass*>* _class_list; | |
| 908 static void add_to_class_list(instanceKlass* ik); | |
| 909 | |
| 910 public: | |
| 911 // returns the field map for a given object (returning map cached | |
| 912 // by instanceKlass if possible | |
| 913 static ClassFieldMap* get_map_of_instance_fields(oop obj); | |
| 914 | |
| 915 // removes the field map from all instanceKlasses - should be | |
| 916 // called before VM operation completes | |
| 917 static void clear_cache(); | |
| 918 | |
| 919 // returns the number of ClassFieldMap cached by instanceKlasses | |
| 920 static int cached_field_map_count(); | |
| 921 }; | |
| 922 | |
| 923 GrowableArray<instanceKlass*>* JvmtiCachedClassFieldMap::_class_list; | |
| 924 | |
| 925 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
| 926 _field_map = field_map; | |
| 927 } | |
| 928 | |
| 929 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
| 930 if (_field_map != NULL) { | |
| 931 delete _field_map; | |
| 932 } | |
| 933 } | |
| 934 | |
| 935 // Marker class to ensure that the class file map cache is only used in a defined | |
| 936 // scope. | |
| 937 class ClassFieldMapCacheMark : public StackObj { | |
| 938 private: | |
| 939 static bool _is_active; | |
| 940 public: | |
| 941 ClassFieldMapCacheMark() { | |
| 942 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 943 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
| 944 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
| 945 _is_active = true; | |
| 946 } | |
| 947 ~ClassFieldMapCacheMark() { | |
| 948 JvmtiCachedClassFieldMap::clear_cache(); | |
| 949 _is_active = false; | |
| 950 } | |
| 951 static bool is_active() { return _is_active; } | |
| 952 }; | |
| 953 | |
| 954 bool ClassFieldMapCacheMark::_is_active; | |
| 955 | |
| 956 | |
| 957 // record that the given instanceKlass is caching a field map | |
| 958 void JvmtiCachedClassFieldMap::add_to_class_list(instanceKlass* ik) { | |
| 959 if (_class_list == NULL) { | |
| 960 _class_list = new (ResourceObj::C_HEAP) GrowableArray<instanceKlass*>(initial_class_count, true); | |
| 961 } | |
| 962 _class_list->push(ik); | |
| 963 } | |
| 964 | |
| 965 // returns the instance field map for the given object | |
| 966 // (returns field map cached by the instanceKlass if possible) | |
| 967 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { | |
| 968 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 969 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
| 970 | |
| 971 klassOop k = obj->klass(); | |
| 972 instanceKlass* ik = instanceKlass::cast(k); | |
| 973 | |
| 974 // return cached map if possible | |
| 975 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
| 976 if (cached_map != NULL) { | |
| 977 assert(cached_map->field_map() != NULL, "missing field list"); | |
| 978 return cached_map->field_map(); | |
| 979 } else { | |
| 980 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
| 981 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
| 982 ik->set_jvmti_cached_class_field_map(cached_map); | |
| 983 add_to_class_list(ik); | |
| 984 return field_map; | |
| 985 } | |
| 986 } | |
| 987 | |
| 988 // remove the fields maps cached from all instanceKlasses | |
| 989 void JvmtiCachedClassFieldMap::clear_cache() { | |
| 990 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 991 if (_class_list != NULL) { | |
| 992 for (int i = 0; i < _class_list->length(); i++) { | |
| 993 instanceKlass* ik = _class_list->at(i); | |
| 994 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
| 995 assert(cached_map != NULL, "should not be NULL"); | |
| 996 ik->set_jvmti_cached_class_field_map(NULL); | |
| 997 delete cached_map; // deletes the encapsulated field map | |
| 998 } | |
| 999 delete _class_list; | |
| 1000 _class_list = NULL; | |
| 1001 } | |
| 1002 } | |
| 1003 | |
| 1004 // returns the number of ClassFieldMap cached by instanceKlasses | |
| 1005 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
| 1006 return (_class_list == NULL) ? 0 : _class_list->length(); | |
| 1007 } | |
| 1008 | |
| 1009 // helper function to indicate if an object is filtered by its tag or class tag | |
| 1010 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
| 1011 jlong klass_tag, | |
| 1012 int heap_filter) { | |
| 1013 // apply the heap filter | |
| 1014 if (obj_tag != 0) { | |
| 1015 // filter out tagged objects | |
| 1016 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
| 1017 } else { | |
| 1018 // filter out untagged objects | |
| 1019 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
| 1020 } | |
| 1021 if (klass_tag != 0) { | |
| 1022 // filter out objects with tagged classes | |
| 1023 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
| 1024 } else { | |
| 1025 // filter out objects with untagged classes. | |
| 1026 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
| 1027 } | |
| 1028 return false; | |
| 1029 } | |
| 1030 | |
| 1031 // helper function to indicate if an object is filtered by a klass filter | |
| 1032 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
| 1033 if (!klass_filter.is_null()) { | |
| 1034 if (obj->klass() != klass_filter()) { | |
| 1035 return true; | |
| 1036 } | |
| 1037 } | |
| 1038 return false; | |
| 1039 } | |
| 1040 | |
| 1041 // helper function to tell if a field is a primitive field or not | |
| 1042 static inline bool is_primitive_field_type(char type) { | |
| 1043 return (type != 'L' && type != '['); | |
| 1044 } | |
| 1045 | |
| 1046 // helper function to copy the value from location addr to jvalue. | |
| 1047 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
| 1048 switch (value_type) { | |
| 1049 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
| 1050 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
| 1051 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
| 1052 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
| 1053 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
| 1054 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
| 1055 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
| 1056 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
| 1057 default: ShouldNotReachHere(); | |
| 1058 } | |
| 1059 } | |
| 1060 | |
| 1061 // helper function to invoke string primitive value callback | |
| 1062 // returns visit control flags | |
| 1063 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
| 1064 CallbackWrapper* wrapper, | |
| 1065 oop str, | |
| 1066 void* user_data) | |
| 1067 { | |
| 1142 | 1068 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
| 0 | 1069 |
| 1070 // get the string value and length | |
| 1071 // (string value may be offset from the base) | |
| 1072 int s_len = java_lang_String::length(str); | |
| 1073 typeArrayOop s_value = java_lang_String::value(str); | |
| 1074 int s_offset = java_lang_String::offset(str); | |
| 1075 jchar* value; | |
| 1076 if (s_len > 0) { | |
| 1077 value = s_value->char_at_addr(s_offset); | |
| 1078 } else { | |
| 1079 value = (jchar*) s_value->base(T_CHAR); | |
| 1080 } | |
| 1081 | |
| 1082 // invoke the callback | |
| 1083 return (*cb)(wrapper->klass_tag(), | |
| 1084 wrapper->obj_size(), | |
| 1085 wrapper->obj_tag_p(), | |
| 1086 value, | |
| 1087 (jint)s_len, | |
| 1088 user_data); | |
| 1089 } | |
| 1090 | |
| 1091 // helper function to invoke string primitive value callback | |
| 1092 // returns visit control flags | |
| 1093 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
| 1094 CallbackWrapper* wrapper, | |
| 1095 oop obj, | |
| 1096 void* user_data) | |
| 1097 { | |
| 1098 assert(obj->is_typeArray(), "not a primitive array"); | |
| 1099 | |
| 1100 // get base address of first element | |
| 1101 typeArrayOop array = typeArrayOop(obj); | |
| 1102 BasicType type = typeArrayKlass::cast(array->klass())->element_type(); | |
| 1103 void* elements = array->base(type); | |
| 1104 | |
| 1105 // jvmtiPrimitiveType is defined so this mapping is always correct | |
| 1106 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
| 1107 | |
| 1108 return (*cb)(wrapper->klass_tag(), | |
| 1109 wrapper->obj_size(), | |
| 1110 wrapper->obj_tag_p(), | |
| 1111 (jint)array->length(), | |
| 1112 elem_type, | |
| 1113 elements, | |
| 1114 user_data); | |
| 1115 } | |
| 1116 | |
| 1117 // helper function to invoke the primitive field callback for all static fields | |
| 1118 // of a given class | |
| 1119 static jint invoke_primitive_field_callback_for_static_fields | |
| 1120 (CallbackWrapper* wrapper, | |
| 1121 oop obj, | |
| 1122 jvmtiPrimitiveFieldCallback cb, | |
| 1123 void* user_data) | |
| 1124 { | |
| 1125 // for static fields only the index will be set | |
| 1126 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 1127 | |
| 1142 | 1128 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
| 0 | 1129 if (java_lang_Class::is_primitive(obj)) { |
| 1130 return 0; | |
| 1131 } | |
| 1132 klassOop k = java_lang_Class::as_klassOop(obj); | |
| 1133 Klass* klass = k->klass_part(); | |
| 1134 | |
| 1135 // ignore classes for object and type arrays | |
| 1136 if (!klass->oop_is_instance()) { | |
| 1137 return 0; | |
| 1138 } | |
| 1139 | |
| 1140 // ignore classes which aren't linked yet | |
| 1141 instanceKlass* ik = instanceKlass::cast(k); | |
| 1142 if (!ik->is_linked()) { | |
| 1143 return 0; | |
| 1144 } | |
| 1145 | |
| 1146 // get the field map | |
| 1147 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
| 1148 | |
| 1149 // invoke the callback for each static primitive field | |
| 1150 for (int i=0; i<field_map->field_count(); i++) { | |
| 1151 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 1152 | |
| 1153 // ignore non-primitive fields | |
| 1154 char type = field->field_type(); | |
| 1155 if (!is_primitive_field_type(type)) { | |
| 1156 continue; | |
| 1157 } | |
| 1158 // one-to-one mapping | |
| 1159 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 1160 | |
| 1161 // get offset and field value | |
| 1162 int offset = field->field_offset(); | |
| 1163 address addr = (address)k + offset; | |
| 1164 jvalue value; | |
| 1165 copy_to_jvalue(&value, addr, value_type); | |
| 1166 | |
| 1167 // field index | |
| 1168 reference_info.field.index = field->field_index(); | |
| 1169 | |
| 1170 // invoke the callback | |
| 1171 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
| 1172 &reference_info, | |
| 1173 wrapper->klass_tag(), | |
| 1174 wrapper->obj_tag_p(), | |
| 1175 value, | |
| 1176 value_type, | |
| 1177 user_data); | |
| 1178 if (res & JVMTI_VISIT_ABORT) { | |
| 1179 delete field_map; | |
| 1180 return res; | |
| 1181 } | |
| 1182 } | |
| 1183 | |
| 1184 delete field_map; | |
| 1185 return 0; | |
| 1186 } | |
| 1187 | |
| 1188 // helper function to invoke the primitive field callback for all instance fields | |
| 1189 // of a given object | |
| 1190 static jint invoke_primitive_field_callback_for_instance_fields( | |
| 1191 CallbackWrapper* wrapper, | |
| 1192 oop obj, | |
| 1193 jvmtiPrimitiveFieldCallback cb, | |
| 1194 void* user_data) | |
| 1195 { | |
| 1196 // for instance fields only the index will be set | |
| 1197 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 1198 | |
| 1199 // get the map of the instance fields | |
| 1200 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
| 1201 | |
| 1202 // invoke the callback for each instance primitive field | |
| 1203 for (int i=0; i<fields->field_count(); i++) { | |
| 1204 ClassFieldDescriptor* field = fields->field_at(i); | |
| 1205 | |
| 1206 // ignore non-primitive fields | |
| 1207 char type = field->field_type(); | |
| 1208 if (!is_primitive_field_type(type)) { | |
| 1209 continue; | |
| 1210 } | |
| 1211 // one-to-one mapping | |
| 1212 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 1213 | |
| 1214 // get offset and field value | |
| 1215 int offset = field->field_offset(); | |
| 1216 address addr = (address)obj + offset; | |
| 1217 jvalue value; | |
| 1218 copy_to_jvalue(&value, addr, value_type); | |
| 1219 | |
| 1220 // field index | |
| 1221 reference_info.field.index = field->field_index(); | |
| 1222 | |
| 1223 // invoke the callback | |
| 1224 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
| 1225 &reference_info, | |
| 1226 wrapper->klass_tag(), | |
| 1227 wrapper->obj_tag_p(), | |
| 1228 value, | |
| 1229 value_type, | |
| 1230 user_data); | |
| 1231 if (res & JVMTI_VISIT_ABORT) { | |
| 1232 return res; | |
| 1233 } | |
| 1234 } | |
| 1235 return 0; | |
| 1236 } | |
| 1237 | |
| 1238 | |
| 1239 // VM operation to iterate over all objects in the heap (both reachable | |
| 1240 // and unreachable) | |
| 1241 class VM_HeapIterateOperation: public VM_Operation { | |
| 1242 private: | |
| 1243 ObjectClosure* _blk; | |
| 1244 public: | |
| 1245 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
| 1246 | |
| 1247 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
| 1248 void doit() { | |
| 1249 // allows class files maps to be cached during iteration | |
| 1250 ClassFieldMapCacheMark cm; | |
| 1251 | |
| 1252 // make sure that heap is parsable (fills TLABs with filler objects) | |
| 1253 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
| 1254 | |
| 1255 // Verify heap before iteration - if the heap gets corrupted then | |
| 1256 // JVMTI's IterateOverHeap will crash. | |
| 1257 if (VerifyBeforeIteration) { | |
| 1258 Universe::verify(); | |
| 1259 } | |
| 1260 | |
| 1261 // do the iteration | |
|
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1262 // If this operation encounters a bad object when using CMS, |
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1263 // consider using safe_object_iterate() which avoids perm gen |
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1264 // objects that may contain bad references. |
| 0 | 1265 Universe::heap()->object_iterate(_blk); |
| 1266 | |
| 1267 // when sharing is enabled we must iterate over the shared spaces | |
| 1268 if (UseSharedSpaces) { | |
| 1269 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 1270 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
| 1271 gen->ro_space()->object_iterate(_blk); | |
| 1272 gen->rw_space()->object_iterate(_blk); | |
| 1273 } | |
| 1274 } | |
| 1275 | |
| 1276 }; | |
| 1277 | |
| 1278 | |
| 1279 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
| 1280 // IterateOverInstancesOfClass functions | |
| 1281 class IterateOverHeapObjectClosure: public ObjectClosure { | |
| 1282 private: | |
| 1283 JvmtiTagMap* _tag_map; | |
| 1284 KlassHandle _klass; | |
| 1285 jvmtiHeapObjectFilter _object_filter; | |
| 1286 jvmtiHeapObjectCallback _heap_object_callback; | |
| 1287 const void* _user_data; | |
| 1288 | |
| 1289 // accessors | |
| 1290 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 1291 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
| 1292 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
| 1293 KlassHandle klass() const { return _klass; } | |
| 1294 const void* user_data() const { return _user_data; } | |
| 1295 | |
| 1296 // indicates if iteration has been aborted | |
| 1297 bool _iteration_aborted; | |
| 1298 bool is_iteration_aborted() const { return _iteration_aborted; } | |
| 1299 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
| 1300 | |
| 1301 public: | |
| 1302 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
| 1303 KlassHandle klass, | |
| 1304 jvmtiHeapObjectFilter object_filter, | |
| 1305 jvmtiHeapObjectCallback heap_object_callback, | |
| 1306 const void* user_data) : | |
| 1307 _tag_map(tag_map), | |
| 1308 _klass(klass), | |
| 1309 _object_filter(object_filter), | |
| 1310 _heap_object_callback(heap_object_callback), | |
| 1311 _user_data(user_data), | |
| 1312 _iteration_aborted(false) | |
| 1313 { | |
| 1314 } | |
| 1315 | |
| 1316 void do_object(oop o); | |
| 1317 }; | |
| 1318 | |
| 1319 // invoked for each object in the heap | |
| 1320 void IterateOverHeapObjectClosure::do_object(oop o) { | |
| 1321 // check if iteration has been halted | |
| 1322 if (is_iteration_aborted()) return; | |
| 1323 | |
| 1324 // ignore any objects that aren't visible to profiler | |
| 1325 if (!ServiceUtil::visible_oop(o)) return; | |
| 1326 | |
| 1327 // instanceof check when filtering by klass | |
| 1328 if (!klass().is_null() && !o->is_a(klass()())) { | |
| 1329 return; | |
| 1330 } | |
| 1331 // prepare for the calllback | |
| 1332 CallbackWrapper wrapper(tag_map(), o); | |
| 1333 | |
| 1334 // if the object is tagged and we're only interested in untagged objects | |
| 1335 // then don't invoke the callback. Similiarly, if the object is untagged | |
| 1336 // and we're only interested in tagged objects we skip the callback. | |
| 1337 if (wrapper.obj_tag() != 0) { | |
| 1338 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
| 1339 } else { | |
| 1340 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
| 1341 } | |
| 1342 | |
| 1343 // invoke the agent's callback | |
| 1344 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
| 1345 wrapper.obj_size(), | |
| 1346 wrapper.obj_tag_p(), | |
| 1347 (void*)user_data()); | |
| 1348 if (control == JVMTI_ITERATION_ABORT) { | |
| 1349 set_iteration_aborted(true); | |
| 1350 } | |
| 1351 } | |
| 1352 | |
| 1353 // An ObjectClosure used to support the IterateThroughHeap function | |
| 1354 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
| 1355 private: | |
| 1356 JvmtiTagMap* _tag_map; | |
| 1357 KlassHandle _klass; | |
| 1358 int _heap_filter; | |
| 1359 const jvmtiHeapCallbacks* _callbacks; | |
| 1360 const void* _user_data; | |
| 1361 | |
| 1362 // accessor functions | |
| 1363 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 1364 int heap_filter() const { return _heap_filter; } | |
| 1365 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
| 1366 KlassHandle klass() const { return _klass; } | |
| 1367 const void* user_data() const { return _user_data; } | |
| 1368 | |
| 1369 // indicates if the iteration has been aborted | |
| 1370 bool _iteration_aborted; | |
| 1371 bool is_iteration_aborted() const { return _iteration_aborted; } | |
| 1372 | |
| 1373 // used to check the visit control flags. If the abort flag is set | |
| 1374 // then we set the iteration aborted flag so that the iteration completes | |
| 1375 // without processing any further objects | |
| 1376 bool check_flags_for_abort(jint flags) { | |
| 1377 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
| 1378 if (is_abort) { | |
| 1379 _iteration_aborted = true; | |
| 1380 } | |
| 1381 return is_abort; | |
| 1382 } | |
| 1383 | |
| 1384 public: | |
| 1385 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
| 1386 KlassHandle klass, | |
| 1387 int heap_filter, | |
| 1388 const jvmtiHeapCallbacks* heap_callbacks, | |
| 1389 const void* user_data) : | |
| 1390 _tag_map(tag_map), | |
| 1391 _klass(klass), | |
| 1392 _heap_filter(heap_filter), | |
| 1393 _callbacks(heap_callbacks), | |
| 1394 _user_data(user_data), | |
| 1395 _iteration_aborted(false) | |
| 1396 { | |
| 1397 } | |
| 1398 | |
| 1399 void do_object(oop o); | |
| 1400 }; | |
| 1401 | |
| 1402 // invoked for each object in the heap | |
| 1403 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
| 1404 // check if iteration has been halted | |
| 1405 if (is_iteration_aborted()) return; | |
| 1406 | |
| 1407 // ignore any objects that aren't visible to profiler | |
| 1408 if (!ServiceUtil::visible_oop(obj)) return; | |
| 1409 | |
| 1410 // apply class filter | |
| 1411 if (is_filtered_by_klass_filter(obj, klass())) return; | |
| 1412 | |
| 1413 // prepare for callback | |
| 1414 CallbackWrapper wrapper(tag_map(), obj); | |
| 1415 | |
| 1416 // check if filtered by the heap filter | |
| 1417 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
| 1418 return; | |
| 1419 } | |
| 1420 | |
| 1421 // for arrays we need the length, otherwise -1 | |
| 1422 bool is_array = obj->is_array(); | |
| 1423 int len = is_array ? arrayOop(obj)->length() : -1; | |
| 1424 | |
| 1425 // invoke the object callback (if callback is provided) | |
| 1426 if (callbacks()->heap_iteration_callback != NULL) { | |
| 1427 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
| 1428 jint res = (*cb)(wrapper.klass_tag(), | |
| 1429 wrapper.obj_size(), | |
| 1430 wrapper.obj_tag_p(), | |
| 1431 (jint)len, | |
| 1432 (void*)user_data()); | |
| 1433 if (check_flags_for_abort(res)) return; | |
| 1434 } | |
| 1435 | |
| 1436 // for objects and classes we report primitive fields if callback provided | |
| 1437 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
| 1438 jint res; | |
| 1439 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
| 1142 | 1440 if (obj->klass() == SystemDictionary::Class_klass()) { |
| 0 | 1441 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
| 1442 obj, | |
| 1443 cb, | |
| 1444 (void*)user_data()); | |
| 1445 } else { | |
| 1446 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
| 1447 obj, | |
| 1448 cb, | |
| 1449 (void*)user_data()); | |
| 1450 } | |
| 1451 if (check_flags_for_abort(res)) return; | |
| 1452 } | |
| 1453 | |
| 1454 // string callback | |
| 1455 if (!is_array && | |
| 1456 callbacks()->string_primitive_value_callback != NULL && | |
| 1142 | 1457 obj->klass() == SystemDictionary::String_klass()) { |
| 0 | 1458 jint res = invoke_string_value_callback( |
| 1459 callbacks()->string_primitive_value_callback, | |
| 1460 &wrapper, | |
| 1461 obj, | |
| 1462 (void*)user_data() ); | |
| 1463 if (check_flags_for_abort(res)) return; | |
| 1464 } | |
| 1465 | |
| 1466 // array callback | |
| 1467 if (is_array && | |
| 1468 callbacks()->array_primitive_value_callback != NULL && | |
| 1469 obj->is_typeArray()) { | |
| 1470 jint res = invoke_array_primitive_value_callback( | |
| 1471 callbacks()->array_primitive_value_callback, | |
| 1472 &wrapper, | |
| 1473 obj, | |
| 1474 (void*)user_data() ); | |
| 1475 if (check_flags_for_abort(res)) return; | |
| 1476 } | |
| 1477 }; | |
| 1478 | |
| 1479 | |
| 1480 // Deprecated function to iterate over all objects in the heap | |
| 1481 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
| 1482 KlassHandle klass, | |
| 1483 jvmtiHeapObjectCallback heap_object_callback, | |
| 1484 const void* user_data) | |
| 1485 { | |
| 1486 MutexLocker ml(Heap_lock); | |
| 1487 IterateOverHeapObjectClosure blk(this, | |
| 1488 klass, | |
| 1489 object_filter, | |
| 1490 heap_object_callback, | |
| 1491 user_data); | |
| 1492 VM_HeapIterateOperation op(&blk); | |
| 1493 VMThread::execute(&op); | |
| 1494 } | |
| 1495 | |
| 1496 | |
| 1497 // Iterates over all objects in the heap | |
| 1498 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
| 1499 KlassHandle klass, | |
| 1500 const jvmtiHeapCallbacks* callbacks, | |
| 1501 const void* user_data) | |
| 1502 { | |
| 1503 MutexLocker ml(Heap_lock); | |
| 1504 IterateThroughHeapObjectClosure blk(this, | |
| 1505 klass, | |
| 1506 heap_filter, | |
| 1507 callbacks, | |
| 1508 user_data); | |
| 1509 VM_HeapIterateOperation op(&blk); | |
| 1510 VMThread::execute(&op); | |
| 1511 } | |
| 1512 | |
| 1513 // support class for get_objects_with_tags | |
| 1514 | |
| 1515 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
| 1516 private: | |
| 1517 JvmtiEnv* _env; | |
| 1518 jlong* _tags; | |
| 1519 jint _tag_count; | |
| 1520 | |
| 1521 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
| 1522 GrowableArray<uint64_t>* _tag_results; // collected tags | |
| 1523 | |
| 1524 public: | |
| 1525 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
| 1526 _env = env; | |
| 1527 _tags = (jlong*)tags; | |
| 1528 _tag_count = tag_count; | |
| 1529 _object_results = new (ResourceObj::C_HEAP) GrowableArray<jobject>(1,true); | |
| 1530 _tag_results = new (ResourceObj::C_HEAP) GrowableArray<uint64_t>(1,true); | |
| 1531 } | |
| 1532 | |
| 1533 ~TagObjectCollector() { | |
| 1534 delete _object_results; | |
| 1535 delete _tag_results; | |
| 1536 } | |
| 1537 | |
| 1538 // for each tagged object check if the tag value matches | |
| 1539 // - if it matches then we create a JNI local reference to the object | |
| 1540 // and record the reference and tag value. | |
| 1541 // | |
| 1542 void do_entry(JvmtiTagHashmapEntry* entry) { | |
| 1543 for (int i=0; i<_tag_count; i++) { | |
| 1544 if (_tags[i] == entry->tag()) { | |
|
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1545 oop o = entry->object(); |
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|
1546 assert(o != NULL, "sanity check"); |
| 0 | 1547 |
| 1548 // the mirror is tagged | |
| 1549 if (o->is_klass()) { | |
| 1550 klassOop k = (klassOop)o; | |
| 1551 o = Klass::cast(k)->java_mirror(); | |
| 1552 } | |
| 1553 | |
| 1554 jobject ref = JNIHandles::make_local(JavaThread::current(), o); | |
| 1555 _object_results->append(ref); | |
| 1556 _tag_results->append((uint64_t)entry->tag()); | |
| 1557 } | |
| 1558 } | |
| 1559 } | |
| 1560 | |
| 1561 // return the results from the collection | |
| 1562 // | |
| 1563 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
| 1564 jvmtiError error; | |
| 1565 int count = _object_results->length(); | |
| 1566 assert(count >= 0, "sanity check"); | |
| 1567 | |
| 1568 // if object_result_ptr is not NULL then allocate the result and copy | |
| 1569 // in the object references. | |
| 1570 if (object_result_ptr != NULL) { | |
| 1571 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
| 1572 if (error != JVMTI_ERROR_NONE) { | |
| 1573 return error; | |
| 1574 } | |
| 1575 for (int i=0; i<count; i++) { | |
| 1576 (*object_result_ptr)[i] = _object_results->at(i); | |
| 1577 } | |
| 1578 } | |
| 1579 | |
| 1580 // if tag_result_ptr is not NULL then allocate the result and copy | |
| 1581 // in the tag values. | |
| 1582 if (tag_result_ptr != NULL) { | |
| 1583 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
| 1584 if (error != JVMTI_ERROR_NONE) { | |
| 1585 if (object_result_ptr != NULL) { | |
| 1586 _env->Deallocate((unsigned char*)object_result_ptr); | |
| 1587 } | |
| 1588 return error; | |
| 1589 } | |
| 1590 for (int i=0; i<count; i++) { | |
| 1591 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
| 1592 } | |
| 1593 } | |
| 1594 | |
| 1595 *count_ptr = count; | |
| 1596 return JVMTI_ERROR_NONE; | |
| 1597 } | |
| 1598 }; | |
| 1599 | |
| 1600 // return the list of objects with the specified tags | |
| 1601 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
| 1602 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
| 1603 | |
| 1604 TagObjectCollector collector(env(), tags, count); | |
| 1605 { | |
| 1606 // iterate over all tagged objects | |
| 1607 MutexLocker ml(lock()); | |
| 1608 entry_iterate(&collector); | |
| 1609 } | |
| 1610 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
| 1611 } | |
| 1612 | |
| 1613 | |
| 1614 // ObjectMarker is used to support the marking objects when walking the | |
| 1615 // heap. | |
| 1616 // | |
| 1617 // This implementation uses the existing mark bits in an object for | |
| 1618 // marking. Objects that are marked must later have their headers restored. | |
| 1619 // As most objects are unlocked and don't have their identity hash computed | |
| 1620 // we don't have to save their headers. Instead we save the headers that | |
| 1621 // are "interesting". Later when the headers are restored this implementation | |
| 1622 // restores all headers to their initial value and then restores the few | |
| 1623 // objects that had interesting headers. | |
| 1624 // | |
| 1625 // Future work: This implementation currently uses growable arrays to save | |
| 1626 // the oop and header of interesting objects. As an optimization we could | |
| 1627 // use the same technique as the GC and make use of the unused area | |
| 1628 // between top() and end(). | |
| 1629 // | |
| 1630 | |
| 1631 // An ObjectClosure used to restore the mark bits of an object | |
| 1632 class RestoreMarksClosure : public ObjectClosure { | |
| 1633 public: | |
| 1634 void do_object(oop o) { | |
| 1635 if (o != NULL) { | |
| 1636 markOop mark = o->mark(); | |
| 1637 if (mark->is_marked()) { | |
| 1638 o->init_mark(); | |
| 1639 } | |
| 1640 } | |
| 1641 } | |
| 1642 }; | |
| 1643 | |
| 1644 // ObjectMarker provides the mark and visited functions | |
| 1645 class ObjectMarker : AllStatic { | |
| 1646 private: | |
| 1647 // saved headers | |
| 1648 static GrowableArray<oop>* _saved_oop_stack; | |
| 1649 static GrowableArray<markOop>* _saved_mark_stack; | |
| 1650 | |
| 1651 public: | |
| 1652 static void init(); // initialize | |
| 1653 static void done(); // clean-up | |
| 1654 | |
| 1655 static inline void mark(oop o); // mark an object | |
| 1656 static inline bool visited(oop o); // check if object has been visited | |
| 1657 }; | |
| 1658 | |
| 1659 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
| 1660 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
| 1661 | |
| 1662 // initialize ObjectMarker - prepares for object marking | |
| 1663 void ObjectMarker::init() { | |
| 1664 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 1665 | |
| 1666 // prepare heap for iteration | |
| 1667 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
| 1668 | |
| 1669 // create stacks for interesting headers | |
| 1670 _saved_mark_stack = new (ResourceObj::C_HEAP) GrowableArray<markOop>(4000, true); | |
| 1671 _saved_oop_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(4000, true); | |
| 1672 | |
| 1673 if (UseBiasedLocking) { | |
| 1674 BiasedLocking::preserve_marks(); | |
| 1675 } | |
| 1676 } | |
| 1677 | |
| 1678 // Object marking is done so restore object headers | |
| 1679 void ObjectMarker::done() { | |
| 1680 // iterate over all objects and restore the mark bits to | |
| 1681 // their initial value | |
| 1682 RestoreMarksClosure blk; | |
| 1683 Universe::heap()->object_iterate(&blk); | |
| 1684 | |
| 1685 // When sharing is enabled we need to restore the headers of the objects | |
| 1686 // in the readwrite space too. | |
| 1687 if (UseSharedSpaces) { | |
| 1688 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 1689 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
| 1690 gen->rw_space()->object_iterate(&blk); | |
| 1691 } | |
| 1692 | |
| 1693 // now restore the interesting headers | |
| 1694 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
| 1695 oop o = _saved_oop_stack->at(i); | |
| 1696 markOop mark = _saved_mark_stack->at(i); | |
| 1697 o->set_mark(mark); | |
| 1698 } | |
| 1699 | |
| 1700 if (UseBiasedLocking) { | |
| 1701 BiasedLocking::restore_marks(); | |
| 1702 } | |
| 1703 | |
| 1704 // free the stacks | |
| 1705 delete _saved_oop_stack; | |
| 1706 delete _saved_mark_stack; | |
| 1707 } | |
| 1708 | |
| 1709 // mark an object | |
| 1710 inline void ObjectMarker::mark(oop o) { | |
| 1711 assert(Universe::heap()->is_in(o), "sanity check"); | |
| 1712 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
| 1713 | |
| 1714 // object's mark word | |
| 1715 markOop mark = o->mark(); | |
| 1716 | |
| 1717 if (mark->must_be_preserved(o)) { | |
| 1718 _saved_mark_stack->push(mark); | |
| 1719 _saved_oop_stack->push(o); | |
| 1720 } | |
| 1721 | |
| 1722 // mark the object | |
| 1723 o->set_mark(markOopDesc::prototype()->set_marked()); | |
| 1724 } | |
| 1725 | |
| 1726 // return true if object is marked | |
| 1727 inline bool ObjectMarker::visited(oop o) { | |
| 1728 return o->mark()->is_marked(); | |
| 1729 } | |
| 1730 | |
| 1731 // Stack allocated class to help ensure that ObjectMarker is used | |
| 1732 // correctly. Constructor initializes ObjectMarker, destructor calls | |
| 1733 // ObjectMarker's done() function to restore object headers. | |
| 1734 class ObjectMarkerController : public StackObj { | |
| 1735 public: | |
| 1736 ObjectMarkerController() { | |
| 1737 ObjectMarker::init(); | |
| 1738 } | |
| 1739 ~ObjectMarkerController() { | |
| 1740 ObjectMarker::done(); | |
| 1741 } | |
| 1742 }; | |
| 1743 | |
| 1744 | |
| 1745 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
| 1746 // (not performance critical as only used for roots) | |
| 1747 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
| 1748 switch (kind) { | |
| 1749 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
| 1750 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
| 1751 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
| 1752 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
| 1753 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
| 1754 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
| 1755 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
| 1756 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
| 1757 } | |
| 1758 } | |
| 1759 | |
| 1760 // Base class for all heap walk contexts. The base class maintains a flag | |
| 1761 // to indicate if the context is valid or not. | |
| 1762 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
| 1763 private: | |
| 1764 bool _valid; | |
| 1765 public: | |
| 1766 HeapWalkContext(bool valid) { _valid = valid; } | |
| 1767 void invalidate() { _valid = false; } | |
| 1768 bool is_valid() const { return _valid; } | |
| 1769 }; | |
| 1770 | |
| 1771 // A basic heap walk context for the deprecated heap walking functions. | |
| 1772 // The context for a basic heap walk are the callbacks and fields used by | |
| 1773 // the referrer caching scheme. | |
| 1774 class BasicHeapWalkContext: public HeapWalkContext { | |
| 1775 private: | |
| 1776 jvmtiHeapRootCallback _heap_root_callback; | |
| 1777 jvmtiStackReferenceCallback _stack_ref_callback; | |
| 1778 jvmtiObjectReferenceCallback _object_ref_callback; | |
| 1779 | |
| 1780 // used for caching | |
| 1781 oop _last_referrer; | |
| 1782 jlong _last_referrer_tag; | |
| 1783 | |
| 1784 public: | |
| 1785 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
| 1786 | |
| 1787 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
| 1788 jvmtiStackReferenceCallback stack_ref_callback, | |
| 1789 jvmtiObjectReferenceCallback object_ref_callback) : | |
| 1790 HeapWalkContext(true), | |
| 1791 _heap_root_callback(heap_root_callback), | |
| 1792 _stack_ref_callback(stack_ref_callback), | |
| 1793 _object_ref_callback(object_ref_callback), | |
| 1794 _last_referrer(NULL), | |
| 1795 _last_referrer_tag(0) { | |
| 1796 } | |
| 1797 | |
| 1798 // accessors | |
| 1799 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
| 1800 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
| 1801 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
| 1802 | |
| 1803 oop last_referrer() const { return _last_referrer; } | |
| 1804 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
| 1805 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
| 1806 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
| 1807 }; | |
| 1808 | |
| 1809 // The advanced heap walk context for the FollowReferences functions. | |
| 1810 // The context is the callbacks, and the fields used for filtering. | |
| 1811 class AdvancedHeapWalkContext: public HeapWalkContext { | |
| 1812 private: | |
| 1813 jint _heap_filter; | |
| 1814 KlassHandle _klass_filter; | |
| 1815 const jvmtiHeapCallbacks* _heap_callbacks; | |
| 1816 | |
| 1817 public: | |
| 1818 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
| 1819 | |
| 1820 AdvancedHeapWalkContext(jint heap_filter, | |
| 1821 KlassHandle klass_filter, | |
| 1822 const jvmtiHeapCallbacks* heap_callbacks) : | |
| 1823 HeapWalkContext(true), | |
| 1824 _heap_filter(heap_filter), | |
| 1825 _klass_filter(klass_filter), | |
| 1826 _heap_callbacks(heap_callbacks) { | |
| 1827 } | |
| 1828 | |
| 1829 // accessors | |
| 1830 jint heap_filter() const { return _heap_filter; } | |
| 1831 KlassHandle klass_filter() const { return _klass_filter; } | |
| 1832 | |
| 1833 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
| 1834 return _heap_callbacks->heap_reference_callback; | |
| 1835 }; | |
| 1836 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
| 1837 return _heap_callbacks->primitive_field_callback; | |
| 1838 } | |
| 1839 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
| 1840 return _heap_callbacks->array_primitive_value_callback; | |
| 1841 } | |
| 1842 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
| 1843 return _heap_callbacks->string_primitive_value_callback; | |
| 1844 } | |
| 1845 }; | |
| 1846 | |
| 1847 // The CallbackInvoker is a class with static functions that the heap walk can call | |
| 1848 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
| 1849 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
| 1850 // mode is for the newer FollowReferences function which supports a lot of | |
| 1851 // additional callbacks. | |
| 1852 class CallbackInvoker : AllStatic { | |
| 1853 private: | |
| 1854 // heap walk styles | |
| 1855 enum { basic, advanced }; | |
| 1856 static int _heap_walk_type; | |
| 1857 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
| 1858 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
| 1859 | |
| 1860 // context for basic style heap walk | |
| 1861 static BasicHeapWalkContext _basic_context; | |
| 1862 static BasicHeapWalkContext* basic_context() { | |
| 1863 assert(_basic_context.is_valid(), "invalid"); | |
| 1864 return &_basic_context; | |
| 1865 } | |
| 1866 | |
| 1867 // context for advanced style heap walk | |
| 1868 static AdvancedHeapWalkContext _advanced_context; | |
| 1869 static AdvancedHeapWalkContext* advanced_context() { | |
| 1870 assert(_advanced_context.is_valid(), "invalid"); | |
| 1871 return &_advanced_context; | |
| 1872 } | |
| 1873 | |
| 1874 // context needed for all heap walks | |
| 1875 static JvmtiTagMap* _tag_map; | |
| 1876 static const void* _user_data; | |
| 1877 static GrowableArray<oop>* _visit_stack; | |
| 1878 | |
| 1879 // accessors | |
| 1880 static JvmtiTagMap* tag_map() { return _tag_map; } | |
| 1881 static const void* user_data() { return _user_data; } | |
| 1882 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
| 1883 | |
| 1884 // if the object hasn't been visited then push it onto the visit stack | |
| 1885 // so that it will be visited later | |
| 1886 static inline bool check_for_visit(oop obj) { | |
| 1887 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
| 1888 return true; | |
| 1889 } | |
| 1890 | |
| 1891 // invoke basic style callbacks | |
| 1892 static inline bool invoke_basic_heap_root_callback | |
| 1893 (jvmtiHeapRootKind root_kind, oop obj); | |
| 1894 static inline bool invoke_basic_stack_ref_callback | |
| 1895 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
| 1896 int slot, oop obj); | |
| 1897 static inline bool invoke_basic_object_reference_callback | |
| 1898 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
| 1899 | |
| 1900 // invoke advanced style callbacks | |
| 1901 static inline bool invoke_advanced_heap_root_callback | |
| 1902 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
| 1903 static inline bool invoke_advanced_stack_ref_callback | |
| 1904 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
| 1905 jmethodID method, jlocation bci, jint slot, oop obj); | |
| 1906 static inline bool invoke_advanced_object_reference_callback | |
| 1907 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
| 1908 | |
| 1909 // used to report the value of primitive fields | |
| 1910 static inline bool report_primitive_field | |
| 1911 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
| 1912 | |
| 1913 public: | |
| 1914 // initialize for basic mode | |
| 1915 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
| 1916 GrowableArray<oop>* visit_stack, | |
| 1917 const void* user_data, | |
| 1918 BasicHeapWalkContext context); | |
| 1919 | |
| 1920 // initialize for advanced mode | |
| 1921 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
| 1922 GrowableArray<oop>* visit_stack, | |
| 1923 const void* user_data, | |
| 1924 AdvancedHeapWalkContext context); | |
| 1925 | |
| 1926 // functions to report roots | |
| 1927 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
| 1928 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
| 1929 jmethodID m, oop o); | |
| 1930 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
| 1931 jmethodID method, jlocation bci, jint slot, oop o); | |
| 1932 | |
| 1933 // functions to report references | |
| 1934 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
| 1935 static inline bool report_class_reference(oop referrer, oop referree); | |
| 1936 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
| 1937 static inline bool report_signers_reference(oop referrer, oop referree); | |
| 1938 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
| 1939 static inline bool report_superclass_reference(oop referrer, oop referree); | |
| 1940 static inline bool report_interface_reference(oop referrer, oop referree); | |
| 1941 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
| 1942 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
| 1943 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
| 1944 static inline bool report_primitive_array_values(oop array); | |
| 1945 static inline bool report_string_value(oop str); | |
| 1946 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
| 1947 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
| 1948 }; | |
| 1949 | |
| 1950 // statics | |
| 1951 int CallbackInvoker::_heap_walk_type; | |
| 1952 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
| 1953 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
| 1954 JvmtiTagMap* CallbackInvoker::_tag_map; | |
| 1955 const void* CallbackInvoker::_user_data; | |
| 1956 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
| 1957 | |
| 1958 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
| 1959 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
| 1960 GrowableArray<oop>* visit_stack, | |
| 1961 const void* user_data, | |
| 1962 BasicHeapWalkContext context) { | |
| 1963 _tag_map = tag_map; | |
| 1964 _visit_stack = visit_stack; | |
| 1965 _user_data = user_data; | |
| 1966 _basic_context = context; | |
| 1967 _advanced_context.invalidate(); // will trigger assertion if used | |
| 1968 _heap_walk_type = basic; | |
| 1969 } | |
| 1970 | |
| 1971 // initialize for advanced heap walk (FollowReferences) | |
| 1972 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
| 1973 GrowableArray<oop>* visit_stack, | |
| 1974 const void* user_data, | |
| 1975 AdvancedHeapWalkContext context) { | |
| 1976 _tag_map = tag_map; | |
| 1977 _visit_stack = visit_stack; | |
| 1978 _user_data = user_data; | |
| 1979 _advanced_context = context; | |
| 1980 _basic_context.invalidate(); // will trigger assertion if used | |
| 1981 _heap_walk_type = advanced; | |
| 1982 } | |
| 1983 | |
| 1984 | |
| 1985 // invoke basic style heap root callback | |
| 1986 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
| 1987 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 1988 | |
| 1989 // if we heap roots should be reported | |
| 1990 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
| 1991 if (cb == NULL) { | |
| 1992 return check_for_visit(obj); | |
| 1993 } | |
| 1994 | |
| 1995 CallbackWrapper wrapper(tag_map(), obj); | |
| 1996 jvmtiIterationControl control = (*cb)(root_kind, | |
| 1997 wrapper.klass_tag(), | |
| 1998 wrapper.obj_size(), | |
| 1999 wrapper.obj_tag_p(), | |
| 2000 (void*)user_data()); | |
| 2001 // push root to visit stack when following references | |
| 2002 if (control == JVMTI_ITERATION_CONTINUE && | |
| 2003 basic_context()->object_ref_callback() != NULL) { | |
| 2004 visit_stack()->push(obj); | |
| 2005 } | |
| 2006 return control != JVMTI_ITERATION_ABORT; | |
| 2007 } | |
| 2008 | |
| 2009 // invoke basic style stack ref callback | |
| 2010 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
| 2011 jlong thread_tag, | |
| 2012 jint depth, | |
| 2013 jmethodID method, | |
| 2014 jint slot, | |
| 2015 oop obj) { | |
| 2016 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2017 | |
| 2018 // if we stack refs should be reported | |
| 2019 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
| 2020 if (cb == NULL) { | |
| 2021 return check_for_visit(obj); | |
| 2022 } | |
| 2023 | |
| 2024 CallbackWrapper wrapper(tag_map(), obj); | |
| 2025 jvmtiIterationControl control = (*cb)(root_kind, | |
| 2026 wrapper.klass_tag(), | |
| 2027 wrapper.obj_size(), | |
| 2028 wrapper.obj_tag_p(), | |
| 2029 thread_tag, | |
| 2030 depth, | |
| 2031 method, | |
| 2032 slot, | |
| 2033 (void*)user_data()); | |
| 2034 // push root to visit stack when following references | |
| 2035 if (control == JVMTI_ITERATION_CONTINUE && | |
| 2036 basic_context()->object_ref_callback() != NULL) { | |
| 2037 visit_stack()->push(obj); | |
| 2038 } | |
| 2039 return control != JVMTI_ITERATION_ABORT; | |
| 2040 } | |
| 2041 | |
| 2042 // invoke basic style object reference callback | |
| 2043 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
| 2044 oop referrer, | |
| 2045 oop referree, | |
| 2046 jint index) { | |
| 2047 | |
| 2048 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
| 2049 assert(ServiceUtil::visible_oop(referree), "checking"); | |
| 2050 | |
| 2051 BasicHeapWalkContext* context = basic_context(); | |
| 2052 | |
| 2053 // callback requires the referrer's tag. If it's the same referrer | |
| 2054 // as the last call then we use the cached value. | |
| 2055 jlong referrer_tag; | |
| 2056 if (referrer == context->last_referrer()) { | |
| 2057 referrer_tag = context->last_referrer_tag(); | |
| 2058 } else { | |
| 2059 referrer_tag = tag_for(tag_map(), klassOop_if_java_lang_Class(referrer)); | |
| 2060 } | |
| 2061 | |
| 2062 // do the callback | |
| 2063 CallbackWrapper wrapper(tag_map(), referree); | |
| 2064 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
| 2065 jvmtiIterationControl control = (*cb)(ref_kind, | |
| 2066 wrapper.klass_tag(), | |
| 2067 wrapper.obj_size(), | |
| 2068 wrapper.obj_tag_p(), | |
| 2069 referrer_tag, | |
| 2070 index, | |
| 2071 (void*)user_data()); | |
| 2072 | |
| 2073 // record referrer and referrer tag. For self-references record the | |
| 2074 // tag value from the callback as this might differ from referrer_tag. | |
| 2075 context->set_last_referrer(referrer); | |
| 2076 if (referrer == referree) { | |
| 2077 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
| 2078 } else { | |
| 2079 context->set_last_referrer_tag(referrer_tag); | |
| 2080 } | |
| 2081 | |
| 2082 if (control == JVMTI_ITERATION_CONTINUE) { | |
| 2083 return check_for_visit(referree); | |
| 2084 } else { | |
| 2085 return control != JVMTI_ITERATION_ABORT; | |
| 2086 } | |
| 2087 } | |
| 2088 | |
| 2089 // invoke advanced style heap root callback | |
| 2090 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2091 oop obj) { | |
| 2092 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2093 | |
| 2094 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2095 | |
| 2096 // check that callback is provided | |
| 2097 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2098 if (cb == NULL) { | |
| 2099 return check_for_visit(obj); | |
| 2100 } | |
| 2101 | |
| 2102 // apply class filter | |
| 2103 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2104 return check_for_visit(obj); | |
| 2105 } | |
| 2106 | |
| 2107 // setup the callback wrapper | |
| 2108 CallbackWrapper wrapper(tag_map(), obj); | |
| 2109 | |
| 2110 // apply tag filter | |
| 2111 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2112 wrapper.klass_tag(), | |
| 2113 context->heap_filter())) { | |
| 2114 return check_for_visit(obj); | |
| 2115 } | |
| 2116 | |
| 2117 // for arrays we need the length, otherwise -1 | |
| 2118 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2119 | |
| 2120 // invoke the callback | |
| 2121 jint res = (*cb)(ref_kind, | |
| 2122 NULL, // referrer info | |
| 2123 wrapper.klass_tag(), | |
| 2124 0, // referrer_class_tag is 0 for heap root | |
| 2125 wrapper.obj_size(), | |
| 2126 wrapper.obj_tag_p(), | |
| 2127 NULL, // referrer_tag_p | |
| 2128 len, | |
| 2129 (void*)user_data()); | |
| 2130 if (res & JVMTI_VISIT_ABORT) { | |
| 2131 return false;// referrer class tag | |
| 2132 } | |
| 2133 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2134 check_for_visit(obj); | |
| 2135 } | |
| 2136 return true; | |
| 2137 } | |
| 2138 | |
| 2139 // report a reference from a thread stack to an object | |
| 2140 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2141 jlong thread_tag, | |
| 2142 jlong tid, | |
| 2143 int depth, | |
| 2144 jmethodID method, | |
| 2145 jlocation bci, | |
| 2146 jint slot, | |
| 2147 oop obj) { | |
| 2148 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2149 | |
| 2150 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2151 | |
| 2152 // check that callback is provider | |
| 2153 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2154 if (cb == NULL) { | |
| 2155 return check_for_visit(obj); | |
| 2156 } | |
| 2157 | |
| 2158 // apply class filter | |
| 2159 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2160 return check_for_visit(obj); | |
| 2161 } | |
| 2162 | |
| 2163 // setup the callback wrapper | |
| 2164 CallbackWrapper wrapper(tag_map(), obj); | |
| 2165 | |
| 2166 // apply tag filter | |
| 2167 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2168 wrapper.klass_tag(), | |
| 2169 context->heap_filter())) { | |
| 2170 return check_for_visit(obj); | |
| 2171 } | |
| 2172 | |
| 2173 // setup the referrer info | |
| 2174 jvmtiHeapReferenceInfo reference_info; | |
| 2175 reference_info.stack_local.thread_tag = thread_tag; | |
| 2176 reference_info.stack_local.thread_id = tid; | |
| 2177 reference_info.stack_local.depth = depth; | |
| 2178 reference_info.stack_local.method = method; | |
| 2179 reference_info.stack_local.location = bci; | |
| 2180 reference_info.stack_local.slot = slot; | |
| 2181 | |
| 2182 // for arrays we need the length, otherwise -1 | |
| 2183 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2184 | |
| 2185 // call into the agent | |
| 2186 int res = (*cb)(ref_kind, | |
| 2187 &reference_info, | |
| 2188 wrapper.klass_tag(), | |
| 2189 0, // referrer_class_tag is 0 for heap root (stack) | |
| 2190 wrapper.obj_size(), | |
| 2191 wrapper.obj_tag_p(), | |
| 2192 NULL, // referrer_tag is 0 for root | |
| 2193 len, | |
| 2194 (void*)user_data()); | |
| 2195 | |
| 2196 if (res & JVMTI_VISIT_ABORT) { | |
| 2197 return false; | |
| 2198 } | |
| 2199 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2200 check_for_visit(obj); | |
| 2201 } | |
| 2202 return true; | |
| 2203 } | |
| 2204 | |
| 2205 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
| 2206 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
| 2207 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
| 2208 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
| 2209 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
| 2210 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
| 2211 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
| 2212 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
| 2213 | |
| 2214 // invoke the object reference callback to report a reference | |
| 2215 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2216 oop referrer, | |
| 2217 oop obj, | |
| 2218 jint index) | |
| 2219 { | |
| 2220 // field index is only valid field in reference_info | |
| 2221 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 2222 | |
| 2223 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
| 2224 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2225 | |
| 2226 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2227 | |
| 2228 // check that callback is provider | |
| 2229 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2230 if (cb == NULL) { | |
| 2231 return check_for_visit(obj); | |
| 2232 } | |
| 2233 | |
| 2234 // apply class filter | |
| 2235 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2236 return check_for_visit(obj); | |
| 2237 } | |
| 2238 | |
| 2239 // setup the callback wrapper | |
| 2240 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
| 2241 | |
| 2242 // apply tag filter | |
| 2243 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2244 wrapper.klass_tag(), | |
| 2245 context->heap_filter())) { | |
| 2246 return check_for_visit(obj); | |
| 2247 } | |
| 2248 | |
| 2249 // field index is only valid field in reference_info | |
| 2250 reference_info.field.index = index; | |
| 2251 | |
| 2252 // for arrays we need the length, otherwise -1 | |
| 2253 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2254 | |
| 2255 // invoke the callback | |
| 2256 int res = (*cb)(ref_kind, | |
| 2257 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
| 2258 wrapper.klass_tag(), | |
| 2259 wrapper.referrer_klass_tag(), | |
| 2260 wrapper.obj_size(), | |
| 2261 wrapper.obj_tag_p(), | |
| 2262 wrapper.referrer_tag_p(), | |
| 2263 len, | |
| 2264 (void*)user_data()); | |
| 2265 | |
| 2266 if (res & JVMTI_VISIT_ABORT) { | |
| 2267 return false; | |
| 2268 } | |
| 2269 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2270 check_for_visit(obj); | |
| 2271 } | |
| 2272 return true; | |
| 2273 } | |
| 2274 | |
| 2275 // report a "simple root" | |
| 2276 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
| 2277 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
| 2278 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
| 2279 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2280 | |
| 2281 if (is_basic_heap_walk()) { | |
| 2282 // map to old style root kind | |
| 2283 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
| 2284 return invoke_basic_heap_root_callback(root_kind, obj); | |
| 2285 } else { | |
| 2286 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
| 2287 return invoke_advanced_heap_root_callback(kind, obj); | |
| 2288 } | |
| 2289 } | |
| 2290 | |
| 2291 | |
| 2292 // invoke the primitive array values | |
| 2293 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
| 2294 assert(obj->is_typeArray(), "not a primitive array"); | |
| 2295 | |
| 2296 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2297 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
| 2298 | |
| 2299 // apply class filter | |
| 2300 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2301 return true; | |
| 2302 } | |
| 2303 | |
| 2304 CallbackWrapper wrapper(tag_map(), obj); | |
| 2305 | |
| 2306 // apply tag filter | |
| 2307 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2308 wrapper.klass_tag(), | |
| 2309 context->heap_filter())) { | |
| 2310 return true; | |
| 2311 } | |
| 2312 | |
| 2313 // invoke the callback | |
| 2314 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
| 2315 &wrapper, | |
| 2316 obj, | |
| 2317 (void*)user_data()); | |
| 2318 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2319 } | |
| 2320 | |
| 2321 // invoke the string value callback | |
| 2322 inline bool CallbackInvoker::report_string_value(oop str) { | |
| 1142 | 2323 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
| 0 | 2324 |
| 2325 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2326 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
| 2327 | |
| 2328 // apply class filter | |
| 2329 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
| 2330 return true; | |
| 2331 } | |
| 2332 | |
| 2333 CallbackWrapper wrapper(tag_map(), str); | |
| 2334 | |
| 2335 // apply tag filter | |
| 2336 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2337 wrapper.klass_tag(), | |
| 2338 context->heap_filter())) { | |
| 2339 return true; | |
| 2340 } | |
| 2341 | |
| 2342 // invoke the callback | |
| 2343 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
| 2344 &wrapper, | |
| 2345 str, | |
| 2346 (void*)user_data()); | |
| 2347 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2348 } | |
| 2349 | |
| 2350 // invoke the primitive field callback | |
| 2351 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
| 2352 oop obj, | |
| 2353 jint index, | |
| 2354 address addr, | |
| 2355 char type) | |
| 2356 { | |
| 2357 // for primitive fields only the index will be set | |
| 2358 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 2359 | |
| 2360 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2361 assert(context->primitive_field_callback() != NULL, "no callback"); | |
| 2362 | |
| 2363 // apply class filter | |
| 2364 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2365 return true; | |
| 2366 } | |
| 2367 | |
| 2368 CallbackWrapper wrapper(tag_map(), obj); | |
| 2369 | |
| 2370 // apply tag filter | |
| 2371 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2372 wrapper.klass_tag(), | |
| 2373 context->heap_filter())) { | |
| 2374 return true; | |
| 2375 } | |
| 2376 | |
| 2377 // the field index in the referrer | |
| 2378 reference_info.field.index = index; | |
| 2379 | |
| 2380 // map the type | |
| 2381 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 2382 | |
| 2383 // setup the jvalue | |
| 2384 jvalue value; | |
| 2385 copy_to_jvalue(&value, addr, value_type); | |
| 2386 | |
| 2387 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
| 2388 int res = (*cb)(ref_kind, | |
| 2389 &reference_info, | |
| 2390 wrapper.klass_tag(), | |
| 2391 wrapper.obj_tag_p(), | |
| 2392 value, | |
| 2393 value_type, | |
| 2394 (void*)user_data()); | |
| 2395 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2396 } | |
| 2397 | |
| 2398 | |
| 2399 // instance field | |
| 2400 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
| 2401 jint index, | |
| 2402 address value, | |
| 2403 char type) { | |
| 2404 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
| 2405 obj, | |
| 2406 index, | |
| 2407 value, | |
| 2408 type); | |
| 2409 } | |
| 2410 | |
| 2411 // static field | |
| 2412 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
| 2413 jint index, | |
| 2414 address value, | |
| 2415 char type) { | |
| 2416 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
| 2417 obj, | |
| 2418 index, | |
| 2419 value, | |
| 2420 type); | |
| 2421 } | |
| 2422 | |
| 2423 // report a JNI local (root object) to the profiler | |
| 2424 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
| 2425 if (is_basic_heap_walk()) { | |
| 2426 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
| 2427 thread_tag, | |
| 2428 depth, | |
| 2429 m, | |
| 2430 -1, | |
| 2431 obj); | |
| 2432 } else { | |
| 2433 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
| 2434 thread_tag, tid, | |
| 2435 depth, | |
| 2436 m, | |
| 2437 (jlocation)-1, | |
| 2438 -1, | |
| 2439 obj); | |
| 2440 } | |
| 2441 } | |
| 2442 | |
| 2443 | |
| 2444 // report a local (stack reference, root object) | |
| 2445 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
| 2446 jlong tid, | |
| 2447 jint depth, | |
| 2448 jmethodID method, | |
| 2449 jlocation bci, | |
| 2450 jint slot, | |
| 2451 oop obj) { | |
| 2452 if (is_basic_heap_walk()) { | |
| 2453 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
| 2454 thread_tag, | |
| 2455 depth, | |
| 2456 method, | |
| 2457 slot, | |
| 2458 obj); | |
| 2459 } else { | |
| 2460 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
| 2461 thread_tag, | |
| 2462 tid, | |
| 2463 depth, | |
| 2464 method, | |
| 2465 bci, | |
| 2466 slot, | |
| 2467 obj); | |
| 2468 } | |
| 2469 } | |
| 2470 | |
| 2471 // report an object referencing a class. | |
| 2472 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
| 2473 if (is_basic_heap_walk()) { | |
| 2474 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
| 2475 } else { | |
| 2476 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
| 2477 } | |
| 2478 } | |
| 2479 | |
| 2480 // report a class referencing its class loader. | |
| 2481 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
| 2482 if (is_basic_heap_walk()) { | |
| 2483 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
| 2484 } else { | |
| 2485 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
| 2486 } | |
| 2487 } | |
| 2488 | |
| 2489 // report a class referencing its signers. | |
| 2490 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
| 2491 if (is_basic_heap_walk()) { | |
| 2492 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
| 2493 } else { | |
| 2494 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
| 2495 } | |
| 2496 } | |
| 2497 | |
| 2498 // report a class referencing its protection domain.. | |
| 2499 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
| 2500 if (is_basic_heap_walk()) { | |
| 2501 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
| 2502 } else { | |
| 2503 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
| 2504 } | |
| 2505 } | |
| 2506 | |
| 2507 // report a class referencing its superclass. | |
| 2508 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
| 2509 if (is_basic_heap_walk()) { | |
| 2510 // Send this to be consistent with past implementation | |
| 2511 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
| 2512 } else { | |
| 2513 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); | |
| 2514 } | |
| 2515 } | |
| 2516 | |
| 2517 // report a class referencing one of its interfaces. | |
| 2518 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
| 2519 if (is_basic_heap_walk()) { | |
| 2520 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
| 2521 } else { | |
| 2522 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
| 2523 } | |
| 2524 } | |
| 2525 | |
| 2526 // report a class referencing one of its static fields. | |
| 2527 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
| 2528 if (is_basic_heap_walk()) { | |
| 2529 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
| 2530 } else { | |
| 2531 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
| 2532 } | |
| 2533 } | |
| 2534 | |
| 2535 // report an array referencing an element object | |
| 2536 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
| 2537 if (is_basic_heap_walk()) { | |
| 2538 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
| 2539 } else { | |
| 2540 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
| 2541 } | |
| 2542 } | |
| 2543 | |
| 2544 // report an object referencing an instance field object | |
| 2545 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
| 2546 if (is_basic_heap_walk()) { | |
| 2547 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
| 2548 } else { | |
| 2549 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
| 2550 } | |
| 2551 } | |
| 2552 | |
| 2553 // report an array referencing an element object | |
| 2554 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
| 2555 if (is_basic_heap_walk()) { | |
| 2556 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
| 2557 } else { | |
| 2558 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
| 2559 } | |
| 2560 } | |
| 2561 | |
| 2562 // A supporting closure used to process simple roots | |
| 2563 class SimpleRootsClosure : public OopClosure { | |
| 2564 private: | |
| 2565 jvmtiHeapReferenceKind _kind; | |
| 2566 bool _continue; | |
| 2567 | |
| 2568 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
| 2569 | |
| 2570 public: | |
| 2571 void set_kind(jvmtiHeapReferenceKind kind) { | |
| 2572 _kind = kind; | |
| 2573 _continue = true; | |
| 2574 } | |
| 2575 | |
| 2576 inline bool stopped() { | |
| 2577 return !_continue; | |
| 2578 } | |
| 2579 | |
| 2580 void do_oop(oop* obj_p) { | |
| 2581 // iteration has terminated | |
| 2582 if (stopped()) { | |
| 2583 return; | |
| 2584 } | |
| 2585 | |
| 2586 // ignore null or deleted handles | |
| 2587 oop o = *obj_p; | |
| 2588 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
| 2589 return; | |
| 2590 } | |
| 2591 | |
| 2592 jvmtiHeapReferenceKind kind = root_kind(); | |
| 2593 | |
| 2594 // many roots are Klasses so we use the java mirror | |
| 2595 if (o->is_klass()) { | |
| 2596 klassOop k = (klassOop)o; | |
| 2597 o = Klass::cast(k)->java_mirror(); | |
|
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2598 if (o == NULL) { |
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2599 // Classes without mirrors don't correspond to real Java |
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2600 // classes so just ignore them. |
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2601 return; |
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2602 } |
| 0 | 2603 } else { |
| 2604 | |
| 2605 // SystemDictionary::always_strong_oops_do reports the application | |
| 2606 // class loader as a root. We want this root to be reported as | |
| 2607 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
| 2608 if (o->is_instance() && root_kind() == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { | |
| 2609 kind = JVMTI_HEAP_REFERENCE_OTHER; | |
| 2610 } | |
| 2611 } | |
| 2612 | |
| 2613 // some objects are ignored - in the case of simple | |
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2614 // roots it's mostly Symbol*s that we are skipping |
| 0 | 2615 // here. |
| 2616 if (!ServiceUtil::visible_oop(o)) { | |
| 2617 return; | |
| 2618 } | |
| 2619 | |
| 2620 // invoke the callback | |
| 2621 _continue = CallbackInvoker::report_simple_root(kind, o); | |
| 2622 | |
| 2623 } | |
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2624 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| 0 | 2625 }; |
| 2626 | |
| 2627 // A supporting closure used to process JNI locals | |
| 2628 class JNILocalRootsClosure : public OopClosure { | |
| 2629 private: | |
| 2630 jlong _thread_tag; | |
| 2631 jlong _tid; | |
| 2632 jint _depth; | |
| 2633 jmethodID _method; | |
| 2634 bool _continue; | |
| 2635 public: | |
| 2636 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
| 2637 _thread_tag = thread_tag; | |
| 2638 _tid = tid; | |
| 2639 _depth = depth; | |
| 2640 _method = method; | |
| 2641 _continue = true; | |
| 2642 } | |
| 2643 | |
| 2644 inline bool stopped() { | |
| 2645 return !_continue; | |
| 2646 } | |
| 2647 | |
| 2648 void do_oop(oop* obj_p) { | |
| 2649 // iteration has terminated | |
| 2650 if (stopped()) { | |
| 2651 return; | |
| 2652 } | |
| 2653 | |
| 2654 // ignore null or deleted handles | |
| 2655 oop o = *obj_p; | |
| 2656 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
| 2657 return; | |
| 2658 } | |
| 2659 | |
| 2660 if (!ServiceUtil::visible_oop(o)) { | |
| 2661 return; | |
| 2662 } | |
| 2663 | |
| 2664 // invoke the callback | |
| 2665 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
| 2666 } | |
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2667 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| 0 | 2668 }; |
| 2669 | |
| 2670 | |
| 2671 // A VM operation to iterate over objects that are reachable from | |
| 2672 // a set of roots or an initial object. | |
| 2673 // | |
| 2674 // For VM_HeapWalkOperation the set of roots used is :- | |
| 2675 // | |
| 2676 // - All JNI global references | |
| 2677 // - All inflated monitors | |
| 2678 // - All classes loaded by the boot class loader (or all classes | |
| 2679 // in the event that class unloading is disabled) | |
| 2680 // - All java threads | |
| 2681 // - For each java thread then all locals and JNI local references | |
| 2682 // on the thread's execution stack | |
| 2683 // - All visible/explainable objects from Universes::oops_do | |
| 2684 // | |
| 2685 class VM_HeapWalkOperation: public VM_Operation { | |
| 2686 private: | |
| 2687 enum { | |
| 2688 initial_visit_stack_size = 4000 | |
| 2689 }; | |
| 2690 | |
| 2691 bool _is_advanced_heap_walk; // indicates FollowReferences | |
| 2692 JvmtiTagMap* _tag_map; | |
| 2693 Handle _initial_object; | |
| 2694 GrowableArray<oop>* _visit_stack; // the visit stack | |
| 2695 | |
| 2696 bool _collecting_heap_roots; // are we collecting roots | |
| 2697 bool _following_object_refs; // are we following object references | |
| 2698 | |
| 2699 bool _reporting_primitive_fields; // optional reporting | |
| 2700 bool _reporting_primitive_array_values; | |
| 2701 bool _reporting_string_values; | |
| 2702 | |
| 2703 GrowableArray<oop>* create_visit_stack() { | |
| 2704 return new (ResourceObj::C_HEAP) GrowableArray<oop>(initial_visit_stack_size, true); | |
| 2705 } | |
| 2706 | |
| 2707 // accessors | |
| 2708 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
| 2709 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 2710 Handle initial_object() const { return _initial_object; } | |
| 2711 | |
| 2712 bool is_following_references() const { return _following_object_refs; } | |
| 2713 | |
| 2714 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
| 2715 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
| 2716 bool is_reporting_string_values() const { return _reporting_string_values; } | |
| 2717 | |
| 2718 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
| 2719 | |
| 2720 // iterate over the various object types | |
| 2721 inline bool iterate_over_array(oop o); | |
| 2722 inline bool iterate_over_type_array(oop o); | |
| 2723 inline bool iterate_over_class(klassOop o); | |
| 2724 inline bool iterate_over_object(oop o); | |
| 2725 | |
| 2726 // root collection | |
| 2727 inline bool collect_simple_roots(); | |
| 2728 inline bool collect_stack_roots(); | |
| 2729 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
| 2730 | |
| 2731 // visit an object | |
| 2732 inline bool visit(oop o); | |
| 2733 | |
| 2734 public: | |
| 2735 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2736 Handle initial_object, | |
| 2737 BasicHeapWalkContext callbacks, | |
| 2738 const void* user_data); | |
| 2739 | |
| 2740 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2741 Handle initial_object, | |
| 2742 AdvancedHeapWalkContext callbacks, | |
| 2743 const void* user_data); | |
| 2744 | |
| 2745 ~VM_HeapWalkOperation(); | |
| 2746 | |
| 2747 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
| 2748 void doit(); | |
| 2749 }; | |
| 2750 | |
| 2751 | |
| 2752 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2753 Handle initial_object, | |
| 2754 BasicHeapWalkContext callbacks, | |
| 2755 const void* user_data) { | |
| 2756 _is_advanced_heap_walk = false; | |
| 2757 _tag_map = tag_map; | |
| 2758 _initial_object = initial_object; | |
| 2759 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
| 2760 _reporting_primitive_fields = false; | |
| 2761 _reporting_primitive_array_values = false; | |
| 2762 _reporting_string_values = false; | |
| 2763 _visit_stack = create_visit_stack(); | |
| 2764 | |
| 2765 | |
| 2766 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
| 2767 } | |
| 2768 | |
| 2769 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2770 Handle initial_object, | |
| 2771 AdvancedHeapWalkContext callbacks, | |
| 2772 const void* user_data) { | |
| 2773 _is_advanced_heap_walk = true; | |
| 2774 _tag_map = tag_map; | |
| 2775 _initial_object = initial_object; | |
| 2776 _following_object_refs = true; | |
| 2777 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
| 2778 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
| 2779 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
| 2780 _visit_stack = create_visit_stack(); | |
| 2781 | |
| 2782 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
| 2783 } | |
| 2784 | |
| 2785 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
| 2786 if (_following_object_refs) { | |
| 2787 assert(_visit_stack != NULL, "checking"); | |
| 2788 delete _visit_stack; | |
| 2789 _visit_stack = NULL; | |
| 2790 } | |
| 2791 } | |
| 2792 | |
| 2793 // an array references its class and has a reference to | |
| 2794 // each element in the array | |
| 2795 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
| 2796 objArrayOop array = objArrayOop(o); | |
| 2797 if (array->klass() == Universe::systemObjArrayKlassObj()) { | |
| 2798 // filtered out | |
| 2799 return true; | |
| 2800 } | |
| 2801 | |
| 2802 // array reference to its class | |
| 2803 oop mirror = objArrayKlass::cast(array->klass())->java_mirror(); | |
| 2804 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
| 2805 return false; | |
| 2806 } | |
| 2807 | |
| 2808 // iterate over the array and report each reference to a | |
| 2809 // non-null element | |
| 2810 for (int index=0; index<array->length(); index++) { | |
| 2811 oop elem = array->obj_at(index); | |
| 2812 if (elem == NULL) { | |
| 2813 continue; | |
| 2814 } | |
| 2815 | |
| 2816 // report the array reference o[index] = elem | |
| 2817 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
| 2818 return false; | |
| 2819 } | |
| 2820 } | |
| 2821 return true; | |
| 2822 } | |
| 2823 | |
| 2824 // a type array references its class | |
| 2825 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
| 2826 klassOop k = o->klass(); | |
| 2827 oop mirror = Klass::cast(k)->java_mirror(); | |
| 2828 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
| 2829 return false; | |
| 2830 } | |
| 2831 | |
| 2832 // report the array contents if required | |
| 2833 if (is_reporting_primitive_array_values()) { | |
| 2834 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
| 2835 return false; | |
| 2836 } | |
| 2837 } | |
| 2838 return true; | |
| 2839 } | |
| 2840 | |
| 2841 // verify that a static oop field is in range | |
|
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2842 static inline bool verify_static_oop(instanceKlass* ik, |
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2843 oop mirror, int offset) { |
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2844 address obj_p = (address)mirror + offset; |
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2845 address start = (address)instanceMirrorKlass::start_of_static_fields(mirror); |
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2846 address end = start + (java_lang_Class::static_oop_field_count(mirror) * heapOopSize); |
| 0 | 2847 assert(end >= start, "sanity check"); |
| 2848 | |
| 2849 if (obj_p >= start && obj_p < end) { | |
| 2850 return true; | |
| 2851 } else { | |
| 2852 return false; | |
| 2853 } | |
| 2854 } | |
| 2855 | |
| 2856 // a class references its super class, interfaces, class loader, ... | |
| 2857 // and finally its static fields | |
| 2858 inline bool VM_HeapWalkOperation::iterate_over_class(klassOop k) { | |
| 2859 int i; | |
| 2860 Klass* klass = klassOop(k)->klass_part(); | |
| 2861 | |
| 2862 if (klass->oop_is_instance()) { | |
| 2863 instanceKlass* ik = instanceKlass::cast(k); | |
| 2864 | |
| 2865 // ignore the class if it's has been initialized yet | |
| 2866 if (!ik->is_linked()) { | |
| 2867 return true; | |
| 2868 } | |
| 2869 | |
| 2870 // get the java mirror | |
| 2871 oop mirror = klass->java_mirror(); | |
| 2872 | |
| 2873 // super (only if something more interesting than java.lang.Object) | |
| 2874 klassOop java_super = ik->java_super(); | |
| 1142 | 2875 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
| 0 | 2876 oop super = Klass::cast(java_super)->java_mirror(); |
| 2877 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { | |
| 2878 return false; | |
| 2879 } | |
| 2880 } | |
| 2881 | |
| 2882 // class loader | |
| 2883 oop cl = ik->class_loader(); | |
| 2884 if (cl != NULL) { | |
| 2885 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
| 2886 return false; | |
| 2887 } | |
| 2888 } | |
| 2889 | |
| 2890 // protection domain | |
| 2891 oop pd = ik->protection_domain(); | |
| 2892 if (pd != NULL) { | |
| 2893 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
| 2894 return false; | |
| 2895 } | |
| 2896 } | |
| 2897 | |
| 2898 // signers | |
| 2899 oop signers = ik->signers(); | |
| 2900 if (signers != NULL) { | |
| 2901 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
| 2902 return false; | |
| 2903 } | |
| 2904 } | |
| 2905 | |
| 2906 // references from the constant pool | |
| 2907 { | |
| 2908 const constantPoolOop pool = ik->constants(); | |
| 2909 for (int i = 1; i < pool->length(); i++) { | |
| 2910 constantTag tag = pool->tag_at(i).value(); | |
| 2911 if (tag.is_string() || tag.is_klass()) { | |
| 2912 oop entry; | |
| 2913 if (tag.is_string()) { | |
| 2914 entry = pool->resolved_string_at(i); | |
| 2915 assert(java_lang_String::is_instance(entry), "must be string"); | |
| 2916 } else { | |
| 2917 entry = Klass::cast(pool->resolved_klass_at(i))->java_mirror(); | |
| 2918 } | |
| 2919 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
| 2920 return false; | |
| 2921 } | |
| 2922 } | |
| 2923 } | |
| 2924 } | |
| 2925 | |
| 2926 // interfaces | |
| 2927 // (These will already have been reported as references from the constant pool | |
| 2928 // but are specified by IterateOverReachableObjects and must be reported). | |
| 2929 objArrayOop interfaces = ik->local_interfaces(); | |
| 2930 for (i = 0; i < interfaces->length(); i++) { | |
| 2931 oop interf = Klass::cast((klassOop)interfaces->obj_at(i))->java_mirror(); | |
| 2932 if (interf == NULL) { | |
| 2933 continue; | |
| 2934 } | |
| 2935 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
| 2936 return false; | |
| 2937 } | |
| 2938 } | |
| 2939 | |
| 2940 // iterate over the static fields | |
| 2941 | |
| 2942 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
| 2943 for (i=0; i<field_map->field_count(); i++) { | |
| 2944 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 2945 char type = field->field_type(); | |
| 2946 if (!is_primitive_field_type(type)) { | |
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2947 oop fld_o = mirror->obj_field(field->field_offset()); |
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2948 assert(verify_static_oop(ik, mirror, field->field_offset()), "sanity check"); |
| 0 | 2949 if (fld_o != NULL) { |
| 2950 int slot = field->field_index(); | |
| 2951 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
| 2952 delete field_map; | |
| 2953 return false; | |
| 2954 } | |
| 2955 } | |
| 2956 } else { | |
| 2957 if (is_reporting_primitive_fields()) { | |
|
2377
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7029509: nightly failures after static fields in Class
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2376
diff
changeset
|
2958 address addr = (address)mirror + field->field_offset(); |
| 0 | 2959 int slot = field->field_index(); |
| 2960 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
| 2961 delete field_map; | |
| 2962 return false; | |
| 2963 } | |
| 2964 } | |
| 2965 } | |
| 2966 } | |
| 2967 delete field_map; | |
| 2968 | |
| 2969 return true; | |
| 2970 } | |
| 2971 | |
| 2972 return true; | |
| 2973 } | |
| 2974 | |
| 2975 // an object references a class and its instance fields | |
| 2976 // (static fields are ignored here as we report these as | |
| 2977 // references from the class). | |
| 2978 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
| 2979 // reference to the class | |
| 2980 if (!CallbackInvoker::report_class_reference(o, Klass::cast(o->klass())->java_mirror())) { | |
| 2981 return false; | |
| 2982 } | |
| 2983 | |
| 2984 // iterate over instance fields | |
| 2985 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
| 2986 for (int i=0; i<field_map->field_count(); i++) { | |
| 2987 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 2988 char type = field->field_type(); | |
| 2989 if (!is_primitive_field_type(type)) { | |
|
113
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
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0
diff
changeset
|
2990 oop fld_o = o->obj_field(field->field_offset()); |
| 0 | 2991 if (fld_o != NULL) { |
| 2992 // reflection code may have a reference to a klassOop. | |
| 2993 // - see sun.reflect.UnsafeStaticFieldAccessorImpl and sun.misc.Unsafe | |
| 2994 if (fld_o->is_klass()) { | |
| 2995 klassOop k = (klassOop)fld_o; | |
| 2996 fld_o = Klass::cast(k)->java_mirror(); | |
| 2997 } | |
| 2998 int slot = field->field_index(); | |
| 2999 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
| 3000 return false; | |
| 3001 } | |
| 3002 } | |
| 3003 } else { | |
| 3004 if (is_reporting_primitive_fields()) { | |
| 3005 // primitive instance field | |
| 3006 address addr = (address)o + field->field_offset(); | |
| 3007 int slot = field->field_index(); | |
| 3008 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
| 3009 return false; | |
| 3010 } | |
| 3011 } | |
| 3012 } | |
| 3013 } | |
| 3014 | |
| 3015 // if the object is a java.lang.String | |
| 3016 if (is_reporting_string_values() && | |
| 1142 | 3017 o->klass() == SystemDictionary::String_klass()) { |
| 0 | 3018 if (!CallbackInvoker::report_string_value(o)) { |
| 3019 return false; | |
| 3020 } | |
| 3021 } | |
| 3022 return true; | |
| 3023 } | |
| 3024 | |
| 3025 | |
| 3026 // collects all simple (non-stack) roots. | |
| 3027 // if there's a heap root callback provided then the callback is | |
| 3028 // invoked for each simple root. | |
| 3029 // if an object reference callback is provided then all simple | |
| 3030 // roots are pushed onto the marking stack so that they can be | |
| 3031 // processed later | |
| 3032 // | |
| 3033 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
| 3034 SimpleRootsClosure blk; | |
| 3035 | |
| 3036 // JNI globals | |
| 3037 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
| 3038 JNIHandles::oops_do(&blk); | |
| 3039 if (blk.stopped()) { | |
| 3040 return false; | |
| 3041 } | |
| 3042 | |
| 3043 // Preloaded classes and loader from the system dictionary | |
| 3044 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
| 3045 SystemDictionary::always_strong_oops_do(&blk); | |
| 3046 if (blk.stopped()) { | |
| 3047 return false; | |
| 3048 } | |
| 3049 | |
| 3050 // Inflated monitors | |
| 3051 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
| 3052 ObjectSynchronizer::oops_do(&blk); | |
| 3053 if (blk.stopped()) { | |
| 3054 return false; | |
| 3055 } | |
| 3056 | |
| 3057 // Threads | |
| 3058 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
| 3059 oop threadObj = thread->threadObj(); | |
| 3060 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
| 3061 bool cont = CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, threadObj); | |
| 3062 if (!cont) { | |
| 3063 return false; | |
| 3064 } | |
| 3065 } | |
| 3066 } | |
| 3067 | |
| 3068 // Other kinds of roots maintained by HotSpot | |
| 3069 // Many of these won't be visible but others (such as instances of important | |
| 3070 // exceptions) will be visible. | |
| 3071 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
| 3072 Universe::oops_do(&blk); | |
|
989
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6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3073 |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3074 // If there are any non-perm roots in the code cache, visit them. |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3075 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3076 CodeBlobToOopClosure look_in_blobs(&blk, false); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3077 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3078 |
| 0 | 3079 return true; |
| 3080 } | |
| 3081 | |
| 3082 // Walk the stack of a given thread and find all references (locals | |
| 3083 // and JNI calls) and report these as stack references | |
| 3084 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
| 3085 JNILocalRootsClosure* blk) | |
| 3086 { | |
| 3087 oop threadObj = java_thread->threadObj(); | |
| 3088 assert(threadObj != NULL, "sanity check"); | |
| 3089 | |
| 3090 // only need to get the thread's tag once per thread | |
| 3091 jlong thread_tag = tag_for(_tag_map, threadObj); | |
| 3092 | |
| 3093 // also need the thread id | |
| 3094 jlong tid = java_lang_Thread::thread_id(threadObj); | |
| 3095 | |
| 3096 | |
| 3097 if (java_thread->has_last_Java_frame()) { | |
| 3098 | |
| 3099 // vframes are resource allocated | |
| 3100 Thread* current_thread = Thread::current(); | |
| 3101 ResourceMark rm(current_thread); | |
| 3102 HandleMark hm(current_thread); | |
| 3103 | |
| 3104 RegisterMap reg_map(java_thread); | |
| 3105 frame f = java_thread->last_frame(); | |
| 3106 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
| 3107 | |
| 3108 bool is_top_frame = true; | |
| 3109 int depth = 0; | |
| 3110 frame* last_entry_frame = NULL; | |
| 3111 | |
| 3112 while (vf != NULL) { | |
| 3113 if (vf->is_java_frame()) { | |
| 3114 | |
| 3115 // java frame (interpreted, compiled, ...) | |
| 3116 javaVFrame *jvf = javaVFrame::cast(vf); | |
| 3117 | |
| 3118 // the jmethodID | |
| 3119 jmethodID method = jvf->method()->jmethod_id(); | |
| 3120 | |
| 3121 if (!(jvf->method()->is_native())) { | |
| 3122 jlocation bci = (jlocation)jvf->bci(); | |
| 3123 StackValueCollection* locals = jvf->locals(); | |
| 3124 for (int slot=0; slot<locals->size(); slot++) { | |
| 3125 if (locals->at(slot)->type() == T_OBJECT) { | |
| 3126 oop o = locals->obj_at(slot)(); | |
| 3127 if (o == NULL) { | |
| 3128 continue; | |
| 3129 } | |
| 3130 | |
| 3131 // stack reference | |
| 3132 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
| 3133 bci, slot, o)) { | |
| 3134 return false; | |
| 3135 } | |
| 3136 } | |
| 3137 } | |
| 3138 } else { | |
| 3139 blk->set_context(thread_tag, tid, depth, method); | |
| 3140 if (is_top_frame) { | |
| 3141 // JNI locals for the top frame. | |
| 3142 java_thread->active_handles()->oops_do(blk); | |
| 3143 } else { | |
| 3144 if (last_entry_frame != NULL) { | |
| 3145 // JNI locals for the entry frame | |
| 3146 assert(last_entry_frame->is_entry_frame(), "checking"); | |
| 3147 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
| 3148 } | |
| 3149 } | |
| 3150 } | |
| 3151 last_entry_frame = NULL; | |
| 3152 depth++; | |
| 3153 } else { | |
| 3154 // externalVFrame - for an entry frame then we report the JNI locals | |
| 3155 // when we find the corresponding javaVFrame | |
| 3156 frame* fr = vf->frame_pointer(); | |
| 3157 assert(fr != NULL, "sanity check"); | |
| 3158 if (fr->is_entry_frame()) { | |
| 3159 last_entry_frame = fr; | |
| 3160 } | |
|
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
2377
diff
changeset
|
3161 if (fr->is_ricochet_frame()) { |
|
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
2377
diff
changeset
|
3162 fr->oops_ricochet_do(blk, vf->register_map()); |
|
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
2377
diff
changeset
|
3163 } |
| 0 | 3164 } |
| 3165 | |
| 3166 vf = vf->sender(); | |
| 3167 is_top_frame = false; | |
| 3168 } | |
| 3169 } else { | |
| 3170 // no last java frame but there may be JNI locals | |
| 3171 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
| 3172 java_thread->active_handles()->oops_do(blk); | |
| 3173 } | |
| 3174 return true; | |
| 3175 } | |
| 3176 | |
| 3177 | |
| 3178 // collects all stack roots - for each thread it walks the execution | |
| 3179 // stack to find all references and local JNI refs. | |
| 3180 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
| 3181 JNILocalRootsClosure blk; | |
| 3182 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
| 3183 oop threadObj = thread->threadObj(); | |
| 3184 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
| 3185 if (!collect_stack_roots(thread, &blk)) { | |
| 3186 return false; | |
| 3187 } | |
| 3188 } | |
| 3189 } | |
| 3190 return true; | |
| 3191 } | |
| 3192 | |
| 3193 // visit an object | |
| 3194 // first mark the object as visited | |
| 3195 // second get all the outbound references from this object (in other words, all | |
| 3196 // the objects referenced by this object). | |
| 3197 // | |
| 3198 bool VM_HeapWalkOperation::visit(oop o) { | |
| 3199 // mark object as visited | |
| 3200 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
| 3201 ObjectMarker::mark(o); | |
| 3202 | |
| 3203 // instance | |
| 3204 if (o->is_instance()) { | |
| 1142 | 3205 if (o->klass() == SystemDictionary::Class_klass()) { |
| 0 | 3206 o = klassOop_if_java_lang_Class(o); |
| 3207 if (o->is_klass()) { | |
| 3208 // a java.lang.Class | |
| 3209 return iterate_over_class(klassOop(o)); | |
| 3210 } | |
| 3211 } else { | |
| 3212 return iterate_over_object(o); | |
| 3213 } | |
| 3214 } | |
| 3215 | |
| 3216 // object array | |
| 3217 if (o->is_objArray()) { | |
| 3218 return iterate_over_array(o); | |
| 3219 } | |
| 3220 | |
| 3221 // type array | |
| 3222 if (o->is_typeArray()) { | |
| 3223 return iterate_over_type_array(o); | |
| 3224 } | |
| 3225 | |
| 3226 return true; | |
| 3227 } | |
| 3228 | |
| 3229 void VM_HeapWalkOperation::doit() { | |
| 3230 ResourceMark rm; | |
| 3231 ObjectMarkerController marker; | |
| 3232 ClassFieldMapCacheMark cm; | |
| 3233 | |
| 3234 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
| 3235 | |
| 3236 // the heap walk starts with an initial object or the heap roots | |
| 3237 if (initial_object().is_null()) { | |
| 3238 if (!collect_simple_roots()) return; | |
| 3239 if (!collect_stack_roots()) return; | |
| 3240 } else { | |
| 3241 visit_stack()->push(initial_object()()); | |
| 3242 } | |
| 3243 | |
| 3244 // object references required | |
| 3245 if (is_following_references()) { | |
| 3246 | |
| 3247 // visit each object until all reachable objects have been | |
| 3248 // visited or the callback asked to terminate the iteration. | |
| 3249 while (!visit_stack()->is_empty()) { | |
| 3250 oop o = visit_stack()->pop(); | |
| 3251 if (!ObjectMarker::visited(o)) { | |
| 3252 if (!visit(o)) { | |
| 3253 break; | |
| 3254 } | |
| 3255 } | |
| 3256 } | |
| 3257 } | |
| 3258 } | |
| 3259 | |
| 3260 // iterate over all objects that are reachable from a set of roots | |
| 3261 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
| 3262 jvmtiStackReferenceCallback stack_ref_callback, | |
| 3263 jvmtiObjectReferenceCallback object_ref_callback, | |
| 3264 const void* user_data) { | |
| 3265 MutexLocker ml(Heap_lock); | |
| 3266 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
| 3267 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
| 3268 VMThread::execute(&op); | |
| 3269 } | |
| 3270 | |
| 3271 // iterate over all objects that are reachable from a given object | |
| 3272 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
| 3273 jvmtiObjectReferenceCallback object_ref_callback, | |
| 3274 const void* user_data) { | |
| 3275 oop obj = JNIHandles::resolve(object); | |
| 3276 Handle initial_object(Thread::current(), obj); | |
| 3277 | |
| 3278 MutexLocker ml(Heap_lock); | |
| 3279 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
| 3280 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
| 3281 VMThread::execute(&op); | |
| 3282 } | |
| 3283 | |
| 3284 // follow references from an initial object or the GC roots | |
| 3285 void JvmtiTagMap::follow_references(jint heap_filter, | |
| 3286 KlassHandle klass, | |
| 3287 jobject object, | |
| 3288 const jvmtiHeapCallbacks* callbacks, | |
| 3289 const void* user_data) | |
| 3290 { | |
| 3291 oop obj = JNIHandles::resolve(object); | |
| 3292 Handle initial_object(Thread::current(), obj); | |
| 3293 | |
| 3294 MutexLocker ml(Heap_lock); | |
| 3295 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
| 3296 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
| 3297 VMThread::execute(&op); | |
| 3298 } | |
| 3299 | |
| 3300 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3301 void JvmtiTagMap::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) { |
|
2145
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3302 // No locks during VM bring-up (0 threads) and no safepoints after main |
|
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3303 // thread creation and before VMThread creation (1 thread); initial GC |
|
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3304 // verification can happen in that window which gets to here. |
|
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3305 assert(Threads::number_of_threads() <= 1 || |
|
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3306 SafepointSynchronize::is_at_safepoint(), |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3307 "must be executed at a safepoint"); |
| 0 | 3308 if (JvmtiEnv::environments_might_exist()) { |
| 3309 JvmtiEnvIterator it; | |
| 3310 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
| 3311 JvmtiTagMap* tag_map = env->tag_map(); | |
| 3312 if (tag_map != NULL && !tag_map->is_empty()) { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3313 tag_map->do_weak_oops(is_alive, f); |
| 0 | 3314 } |
| 3315 } | |
| 3316 } | |
| 3317 } | |
| 3318 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3319 void JvmtiTagMap::do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f) { |
| 0 | 3320 |
| 3321 // does this environment have the OBJECT_FREE event enabled | |
| 3322 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
| 3323 | |
| 3324 // counters used for trace message | |
| 3325 int freed = 0; | |
| 3326 int moved = 0; | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3327 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3328 JvmtiTagHashmap* hashmap = this->hashmap(); |
| 0 | 3329 |
| 3330 // reenable sizing (if disabled) | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3331 hashmap->set_resizing_enabled(true); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3332 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3333 // if the hashmap is empty then we can skip it |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3334 if (hashmap->_entry_count == 0) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3335 return; |
| 0 | 3336 } |
| 3337 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3338 // now iterate through each entry in the table |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3339 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3340 JvmtiTagHashmapEntry** table = hashmap->table(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3341 int size = hashmap->size(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3342 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3343 JvmtiTagHashmapEntry* delayed_add = NULL; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3344 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3345 for (int pos = 0; pos < size; ++pos) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3346 JvmtiTagHashmapEntry* entry = table[pos]; |
|
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3347 JvmtiTagHashmapEntry* prev = NULL; |
|
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3348 |
|
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
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|
3349 while (entry != NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3350 JvmtiTagHashmapEntry* next = entry->next(); |
|
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3351 |
|
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diff
changeset
|
3352 oop* obj = entry->object_addr(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3353 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3354 // has object been GC'ed |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3355 if (!is_alive->do_object_b(entry->object())) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3356 // grab the tag |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3357 jlong tag = entry->tag(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3358 guarantee(tag != 0, "checking"); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3359 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3360 // remove GC'ed entry from hashmap and return the |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3361 // entry to the free list |
|
7246a374a9f2
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kamg
parents:
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diff
changeset
|
3362 hashmap->remove(prev, pos, entry); |
|
7246a374a9f2
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kamg
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1972
diff
changeset
|
3363 destroy_entry(entry); |
|
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3364 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3365 // post the event to the profiler |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3366 if (post_object_free) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3367 JvmtiExport::post_object_free(env(), tag); |
|
7246a374a9f2
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kamg
parents:
1972
diff
changeset
|
3368 } |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3369 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3370 ++freed; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3371 } else { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3372 f->do_oop(entry->object_addr()); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3373 oop new_oop = entry->object(); |
|
7246a374a9f2
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kamg
parents:
1972
diff
changeset
|
3374 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3375 // if the object has moved then re-hash it and move its |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3376 // entry to its new location. |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3377 unsigned int new_pos = JvmtiTagHashmap::hash(new_oop, size); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3378 if (new_pos != (unsigned int)pos) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3379 if (prev == NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3380 table[pos] = next; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3381 } else { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3382 prev->set_next(next); |
| 0 | 3383 } |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3384 if (new_pos < (unsigned int)pos) { |
| 0 | 3385 entry->set_next(table[new_pos]); |
| 3386 table[new_pos] = entry; | |
| 3387 } else { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3388 // Delay adding this entry to it's new position as we'd end up |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3389 // hitting it again during this iteration. |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3390 entry->set_next(delayed_add); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3391 delayed_add = entry; |
| 0 | 3392 } |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3393 moved++; |
| 0 | 3394 } else { |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3395 // object didn't move |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3396 prev = entry; |
| 0 | 3397 } |
| 3398 } | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3399 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3400 entry = next; |
| 0 | 3401 } |
| 3402 } | |
| 3403 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3404 // Re-add all the entries which were kept aside |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3405 while (delayed_add != NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3406 JvmtiTagHashmapEntry* next = delayed_add->next(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3407 unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3408 delayed_add->set_next(table[pos]); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3409 table[pos] = delayed_add; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3410 delayed_add = next; |
| 0 | 3411 } |
| 3412 | |
| 3413 // stats | |
| 3414 if (TraceJVMTIObjectTagging) { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3415 int post_total = hashmap->_entry_count; |
| 0 | 3416 int pre_total = post_total + freed; |
| 3417 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3418 tty->print_cr("(%d->%d, %d freed, %d total moves)", |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3419 pre_total, post_total, freed, moved); |
| 0 | 3420 } |
| 3421 } |