Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiTagMap.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 1d7922586cf6 |
| children | aed758eda82a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #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 | |
| 6197 | 58 class JvmtiTagHashmapEntry : public CHeapObj<mtInternal> { |
| 0 | 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 | |
| 6197 | 109 class JvmtiTagHashmap : public CHeapObj<mtInternal> { |
| 0 | 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*); | |
| 6197 | 153 _table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
| 0 | 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*); | |
| 6197 | 191 JvmtiTagHashmapEntry** new_table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
| 0 | 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 | |
| 537 // A CallbackWrapper is a support class for querying and tagging an object | |
| 538 // around a callback to a profiler. The constructor does pre-callback | |
| 539 // work to get the tag value, klass tag value, ... and the destructor | |
| 540 // does the post-callback work of tagging or untagging the object. | |
| 541 // | |
| 542 // { | |
| 543 // CallbackWrapper wrapper(tag_map, o); | |
| 544 // | |
| 545 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
| 546 // | |
| 547 // } // wrapper goes out of scope here which results in the destructor | |
| 548 // checking to see if the object has been tagged, untagged, or the | |
| 549 // tag value has changed. | |
| 550 // | |
| 551 class CallbackWrapper : public StackObj { | |
| 552 private: | |
| 553 JvmtiTagMap* _tag_map; | |
| 554 JvmtiTagHashmap* _hashmap; | |
| 555 JvmtiTagHashmapEntry* _entry; | |
| 556 oop _o; | |
| 557 jlong _obj_size; | |
| 558 jlong _obj_tag; | |
| 559 jlong _klass_tag; | |
| 560 | |
| 561 protected: | |
| 562 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 563 | |
| 564 // invoked post-callback to tag, untag, or update the tag of an object | |
| 565 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
| 566 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
| 567 public: | |
| 568 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
| 569 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
| 570 "MT unsafe or must be VM thread"); | |
| 571 | |
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572 // object to tag |
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573 _o = o; |
| 0 | 574 |
| 575 // object size | |
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576 _obj_size = (jlong)_o->size() * wordSize; |
| 0 | 577 |
| 578 // record the context | |
| 579 _tag_map = tag_map; | |
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580 _hashmap = tag_map->hashmap(); |
| 0 | 581 _entry = _hashmap->find(_o); |
| 582 | |
| 583 // get object tag | |
| 584 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
| 585 | |
| 586 // get the class and the class's tag value | |
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587 assert(SystemDictionary::Class_klass()->oop_is_instanceMirror(), "Is not?"); |
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588 |
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589 _klass_tag = tag_for(tag_map, _o->klass()->java_mirror()); |
| 0 | 590 } |
| 591 | |
| 592 ~CallbackWrapper() { | |
| 593 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
| 594 } | |
| 595 | |
| 596 inline jlong* obj_tag_p() { return &_obj_tag; } | |
| 597 inline jlong obj_size() const { return _obj_size; } | |
| 598 inline jlong obj_tag() const { return _obj_tag; } | |
| 599 inline jlong klass_tag() const { return _klass_tag; } | |
| 600 }; | |
| 601 | |
| 602 | |
| 603 | |
| 604 // callback post-callback to tag, untag, or update the tag of an object | |
| 605 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
| 606 JvmtiTagHashmap* hashmap, | |
| 607 JvmtiTagHashmapEntry* entry, | |
| 608 jlong obj_tag) { | |
| 609 if (entry == NULL) { | |
| 610 if (obj_tag != 0) { | |
| 611 // callback has tagged the object | |
| 612 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
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613 entry = tag_map()->create_entry(o, obj_tag); |
| 0 | 614 hashmap->add(o, entry); |
| 615 } | |
| 616 } else { | |
| 617 // object was previously tagged - the callback may have untagged | |
| 618 // the object or changed the tag value | |
| 619 if (obj_tag == 0) { | |
| 620 | |
| 621 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
| 622 assert(entry_removed == entry, "checking"); | |
| 623 tag_map()->destroy_entry(entry); | |
| 624 | |
| 625 } else { | |
| 626 if (obj_tag != entry->tag()) { | |
| 627 entry->set_tag(obj_tag); | |
| 628 } | |
| 629 } | |
| 630 } | |
| 631 } | |
| 632 | |
| 633 // An extended CallbackWrapper used when reporting an object reference | |
| 634 // to the agent. | |
| 635 // | |
| 636 // { | |
| 637 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
| 638 // | |
| 639 // (*callback)(wrapper.klass_tag(), | |
| 640 // wrapper.obj_size(), | |
| 641 // wrapper.obj_tag_p() | |
| 642 // wrapper.referrer_tag_p(), ...) | |
| 643 // | |
| 644 // } // wrapper goes out of scope here which results in the destructor | |
| 645 // checking to see if the referrer object has been tagged, untagged, | |
| 646 // or the tag value has changed. | |
| 647 // | |
| 648 class TwoOopCallbackWrapper : public CallbackWrapper { | |
| 649 private: | |
| 650 bool _is_reference_to_self; | |
| 651 JvmtiTagHashmap* _referrer_hashmap; | |
| 652 JvmtiTagHashmapEntry* _referrer_entry; | |
| 653 oop _referrer; | |
| 654 jlong _referrer_obj_tag; | |
| 655 jlong _referrer_klass_tag; | |
| 656 jlong* _referrer_tag_p; | |
| 657 | |
| 658 bool is_reference_to_self() const { return _is_reference_to_self; } | |
| 659 | |
| 660 public: | |
| 661 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
| 662 CallbackWrapper(tag_map, o) | |
| 663 { | |
| 664 // self reference needs to be handled in a special way | |
| 665 _is_reference_to_self = (referrer == o); | |
| 666 | |
| 667 if (_is_reference_to_self) { | |
| 668 _referrer_klass_tag = klass_tag(); | |
| 669 _referrer_tag_p = obj_tag_p(); | |
| 670 } else { | |
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671 _referrer = referrer; |
| 0 | 672 // record the context |
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673 _referrer_hashmap = tag_map->hashmap(); |
| 0 | 674 _referrer_entry = _referrer_hashmap->find(_referrer); |
| 675 | |
| 676 // get object tag | |
| 677 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
| 678 _referrer_tag_p = &_referrer_obj_tag; | |
| 679 | |
| 680 // get referrer class tag. | |
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681 _referrer_klass_tag = tag_for(tag_map, _referrer->klass()->java_mirror()); |
| 0 | 682 } |
| 683 } | |
| 684 | |
| 685 ~TwoOopCallbackWrapper() { | |
| 686 if (!is_reference_to_self()){ | |
| 687 post_callback_tag_update(_referrer, | |
| 688 _referrer_hashmap, | |
| 689 _referrer_entry, | |
| 690 _referrer_obj_tag); | |
| 691 } | |
| 692 } | |
| 693 | |
| 694 // address of referrer tag | |
| 695 // (for a self reference this will return the same thing as obj_tag_p()) | |
| 696 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
| 697 | |
| 698 // referrer's class tag | |
| 699 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
| 700 }; | |
| 701 | |
| 702 // tag an object | |
| 703 // | |
| 704 // This function is performance critical. If many threads attempt to tag objects | |
| 705 // around the same time then it's possible that the Mutex associated with the | |
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706 // tag map will be a hot lock. |
| 0 | 707 void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
| 708 MutexLocker ml(lock()); | |
| 709 | |
| 710 // resolve the object | |
| 711 oop o = JNIHandles::resolve_non_null(object); | |
| 712 | |
| 713 // see if the object is already tagged | |
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714 JvmtiTagHashmap* hashmap = _hashmap; |
| 0 | 715 JvmtiTagHashmapEntry* entry = hashmap->find(o); |
| 716 | |
| 717 // if the object is not already tagged then we tag it | |
| 718 if (entry == NULL) { | |
| 719 if (tag != 0) { | |
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720 entry = create_entry(o, tag); |
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721 hashmap->add(o, entry); |
| 0 | 722 } else { |
| 723 // no-op | |
| 724 } | |
| 725 } else { | |
| 726 // if the object is already tagged then we either update | |
| 727 // the tag (if a new tag value has been provided) | |
| 728 // or remove the object if the new tag value is 0. | |
| 729 if (tag == 0) { | |
| 730 hashmap->remove(o); | |
| 731 destroy_entry(entry); | |
| 732 } else { | |
| 733 entry->set_tag(tag); | |
| 734 } | |
| 735 } | |
| 736 } | |
| 737 | |
| 738 // get the tag for an object | |
| 739 jlong JvmtiTagMap::get_tag(jobject object) { | |
| 740 MutexLocker ml(lock()); | |
| 741 | |
| 742 // resolve the object | |
| 743 oop o = JNIHandles::resolve_non_null(object); | |
| 744 | |
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745 return tag_for(this, o); |
| 0 | 746 } |
| 747 | |
| 748 | |
| 749 // Helper class used to describe the static or instance fields of a class. | |
| 750 // For each field it holds the field index (as defined by the JVMTI specification), | |
| 751 // the field type, and the offset. | |
| 752 | |
| 6197 | 753 class ClassFieldDescriptor: public CHeapObj<mtInternal> { |
| 0 | 754 private: |
| 755 int _field_index; | |
| 756 int _field_offset; | |
| 757 char _field_type; | |
| 758 public: | |
| 759 ClassFieldDescriptor(int index, char type, int offset) : | |
| 760 _field_index(index), _field_type(type), _field_offset(offset) { | |
| 761 } | |
| 762 int field_index() const { return _field_index; } | |
| 763 char field_type() const { return _field_type; } | |
| 764 int field_offset() const { return _field_offset; } | |
| 765 }; | |
| 766 | |
| 6197 | 767 class ClassFieldMap: public CHeapObj<mtInternal> { |
| 0 | 768 private: |
| 769 enum { | |
| 770 initial_field_count = 5 | |
| 771 }; | |
| 772 | |
| 773 // list of field descriptors | |
| 774 GrowableArray<ClassFieldDescriptor*>* _fields; | |
| 775 | |
| 776 // constructor | |
| 777 ClassFieldMap(); | |
| 778 | |
| 779 // add a field | |
| 780 void add(int index, char type, int offset); | |
| 781 | |
| 782 // returns the field count for the given class | |
| 783 static int compute_field_count(instanceKlassHandle ikh); | |
| 784 | |
| 785 public: | |
| 786 ~ClassFieldMap(); | |
| 787 | |
| 788 // access | |
| 789 int field_count() { return _fields->length(); } | |
| 790 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
| 791 | |
| 792 // functions to create maps of static or instance fields | |
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793 static ClassFieldMap* create_map_of_static_fields(Klass* k); |
| 0 | 794 static ClassFieldMap* create_map_of_instance_fields(oop obj); |
| 795 }; | |
| 796 | |
| 797 ClassFieldMap::ClassFieldMap() { | |
| 6197 | 798 _fields = new (ResourceObj::C_HEAP, mtInternal) |
| 799 GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
| 0 | 800 } |
| 801 | |
| 802 ClassFieldMap::~ClassFieldMap() { | |
| 803 for (int i=0; i<_fields->length(); i++) { | |
| 804 delete _fields->at(i); | |
| 805 } | |
| 806 delete _fields; | |
| 807 } | |
| 808 | |
| 809 void ClassFieldMap::add(int index, char type, int offset) { | |
| 810 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
| 811 _fields->append(field); | |
| 812 } | |
| 813 | |
| 814 // Returns a heap allocated ClassFieldMap to describe the static fields | |
| 815 // of the given class. | |
| 816 // | |
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817 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(Klass* k) { |
| 0 | 818 HandleMark hm; |
| 819 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
| 820 | |
| 821 // create the field map | |
| 822 ClassFieldMap* field_map = new ClassFieldMap(); | |
| 823 | |
| 824 FilteredFieldStream f(ikh, false, false); | |
| 825 int max_field_index = f.field_count()-1; | |
| 826 | |
| 827 int index = 0; | |
| 828 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
| 829 // ignore instance fields | |
| 830 if (!fld.access_flags().is_static()) { | |
| 831 continue; | |
| 832 } | |
| 833 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
| 834 } | |
| 835 return field_map; | |
| 836 } | |
| 837 | |
| 838 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
| 839 // of the given class. All instance fields are included (this means public | |
| 840 // and private fields declared in superclasses and superinterfaces too). | |
| 841 // | |
| 842 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
| 843 HandleMark hm; | |
| 844 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
| 845 | |
| 846 // create the field map | |
| 847 ClassFieldMap* field_map = new ClassFieldMap(); | |
| 848 | |
| 849 FilteredFieldStream f(ikh, false, false); | |
| 850 | |
| 851 int max_field_index = f.field_count()-1; | |
| 852 | |
| 853 int index = 0; | |
| 854 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
| 855 // ignore static fields | |
| 856 if (fld.access_flags().is_static()) { | |
| 857 continue; | |
| 858 } | |
| 859 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
| 860 } | |
| 861 | |
| 862 return field_map; | |
| 863 } | |
| 864 | |
| 865 // Helper class used to cache a ClassFileMap for the instance fields of | |
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866 // a cache. A JvmtiCachedClassFieldMap can be cached by an InstanceKlass during |
| 0 | 867 // heap iteration and avoid creating a field map for each object in the heap |
| 868 // (only need to create the map when the first instance of a class is encountered). | |
| 869 // | |
| 6197 | 870 class JvmtiCachedClassFieldMap : public CHeapObj<mtInternal> { |
| 0 | 871 private: |
| 872 enum { | |
| 873 initial_class_count = 200 | |
| 874 }; | |
| 875 ClassFieldMap* _field_map; | |
| 876 | |
| 877 ClassFieldMap* field_map() const { return _field_map; } | |
| 878 | |
| 879 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
| 880 ~JvmtiCachedClassFieldMap(); | |
| 881 | |
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882 static GrowableArray<InstanceKlass*>* _class_list; |
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883 static void add_to_class_list(InstanceKlass* ik); |
| 0 | 884 |
| 885 public: | |
| 886 // returns the field map for a given object (returning map cached | |
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887 // by InstanceKlass if possible |
| 0 | 888 static ClassFieldMap* get_map_of_instance_fields(oop obj); |
| 889 | |
| 890 // removes the field map from all instanceKlasses - should be | |
| 891 // called before VM operation completes | |
| 892 static void clear_cache(); | |
| 893 | |
| 894 // returns the number of ClassFieldMap cached by instanceKlasses | |
| 895 static int cached_field_map_count(); | |
| 896 }; | |
| 897 | |
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898 GrowableArray<InstanceKlass*>* JvmtiCachedClassFieldMap::_class_list; |
| 0 | 899 |
| 900 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
| 901 _field_map = field_map; | |
| 902 } | |
| 903 | |
| 904 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
| 905 if (_field_map != NULL) { | |
| 906 delete _field_map; | |
| 907 } | |
| 908 } | |
| 909 | |
| 910 // Marker class to ensure that the class file map cache is only used in a defined | |
| 911 // scope. | |
| 912 class ClassFieldMapCacheMark : public StackObj { | |
| 913 private: | |
| 914 static bool _is_active; | |
| 915 public: | |
| 916 ClassFieldMapCacheMark() { | |
| 917 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 918 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
| 919 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
| 920 _is_active = true; | |
| 921 } | |
| 922 ~ClassFieldMapCacheMark() { | |
| 923 JvmtiCachedClassFieldMap::clear_cache(); | |
| 924 _is_active = false; | |
| 925 } | |
| 926 static bool is_active() { return _is_active; } | |
| 927 }; | |
| 928 | |
| 929 bool ClassFieldMapCacheMark::_is_active; | |
| 930 | |
| 931 | |
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932 // record that the given InstanceKlass is caching a field map |
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933 void JvmtiCachedClassFieldMap::add_to_class_list(InstanceKlass* ik) { |
| 0 | 934 if (_class_list == NULL) { |
| 6197 | 935 _class_list = new (ResourceObj::C_HEAP, mtInternal) |
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936 GrowableArray<InstanceKlass*>(initial_class_count, true); |
| 0 | 937 } |
| 938 _class_list->push(ik); | |
| 939 } | |
| 940 | |
| 941 // returns the instance field map for the given object | |
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942 // (returns field map cached by the InstanceKlass if possible) |
| 0 | 943 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { |
| 944 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 945 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
| 946 | |
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947 Klass* k = obj->klass(); |
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948 InstanceKlass* ik = InstanceKlass::cast(k); |
| 0 | 949 |
| 950 // return cached map if possible | |
| 951 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
| 952 if (cached_map != NULL) { | |
| 953 assert(cached_map->field_map() != NULL, "missing field list"); | |
| 954 return cached_map->field_map(); | |
| 955 } else { | |
| 956 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
| 957 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
| 958 ik->set_jvmti_cached_class_field_map(cached_map); | |
| 959 add_to_class_list(ik); | |
| 960 return field_map; | |
| 961 } | |
| 962 } | |
| 963 | |
| 964 // remove the fields maps cached from all instanceKlasses | |
| 965 void JvmtiCachedClassFieldMap::clear_cache() { | |
| 966 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 967 if (_class_list != NULL) { | |
| 968 for (int i = 0; i < _class_list->length(); i++) { | |
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969 InstanceKlass* ik = _class_list->at(i); |
| 0 | 970 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); |
| 971 assert(cached_map != NULL, "should not be NULL"); | |
| 972 ik->set_jvmti_cached_class_field_map(NULL); | |
| 973 delete cached_map; // deletes the encapsulated field map | |
| 974 } | |
| 975 delete _class_list; | |
| 976 _class_list = NULL; | |
| 977 } | |
| 978 } | |
| 979 | |
| 980 // returns the number of ClassFieldMap cached by instanceKlasses | |
| 981 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
| 982 return (_class_list == NULL) ? 0 : _class_list->length(); | |
| 983 } | |
| 984 | |
| 985 // helper function to indicate if an object is filtered by its tag or class tag | |
| 986 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
| 987 jlong klass_tag, | |
| 988 int heap_filter) { | |
| 989 // apply the heap filter | |
| 990 if (obj_tag != 0) { | |
| 991 // filter out tagged objects | |
| 992 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
| 993 } else { | |
| 994 // filter out untagged objects | |
| 995 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
| 996 } | |
| 997 if (klass_tag != 0) { | |
| 998 // filter out objects with tagged classes | |
| 999 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
| 1000 } else { | |
| 1001 // filter out objects with untagged classes. | |
| 1002 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
| 1003 } | |
| 1004 return false; | |
| 1005 } | |
| 1006 | |
| 1007 // helper function to indicate if an object is filtered by a klass filter | |
| 1008 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
| 1009 if (!klass_filter.is_null()) { | |
| 1010 if (obj->klass() != klass_filter()) { | |
| 1011 return true; | |
| 1012 } | |
| 1013 } | |
| 1014 return false; | |
| 1015 } | |
| 1016 | |
| 1017 // helper function to tell if a field is a primitive field or not | |
| 1018 static inline bool is_primitive_field_type(char type) { | |
| 1019 return (type != 'L' && type != '['); | |
| 1020 } | |
| 1021 | |
| 1022 // helper function to copy the value from location addr to jvalue. | |
| 1023 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
| 1024 switch (value_type) { | |
| 1025 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
| 1026 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
| 1027 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
| 1028 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
| 1029 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
| 1030 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
| 1031 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
| 1032 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
| 1033 default: ShouldNotReachHere(); | |
| 1034 } | |
| 1035 } | |
| 1036 | |
| 1037 // helper function to invoke string primitive value callback | |
| 1038 // returns visit control flags | |
| 1039 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
| 1040 CallbackWrapper* wrapper, | |
| 1041 oop str, | |
| 1042 void* user_data) | |
| 1043 { | |
| 1142 | 1044 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
| 0 | 1045 |
| 1046 // get the string value and length | |
| 1047 // (string value may be offset from the base) | |
| 1048 int s_len = java_lang_String::length(str); | |
| 1049 typeArrayOop s_value = java_lang_String::value(str); | |
| 1050 int s_offset = java_lang_String::offset(str); | |
| 1051 jchar* value; | |
| 1052 if (s_len > 0) { | |
| 1053 value = s_value->char_at_addr(s_offset); | |
| 1054 } else { | |
| 1055 value = (jchar*) s_value->base(T_CHAR); | |
| 1056 } | |
| 1057 | |
| 1058 // invoke the callback | |
| 1059 return (*cb)(wrapper->klass_tag(), | |
| 1060 wrapper->obj_size(), | |
| 1061 wrapper->obj_tag_p(), | |
| 1062 value, | |
| 1063 (jint)s_len, | |
| 1064 user_data); | |
| 1065 } | |
| 1066 | |
| 1067 // helper function to invoke string primitive value callback | |
| 1068 // returns visit control flags | |
| 1069 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
| 1070 CallbackWrapper* wrapper, | |
| 1071 oop obj, | |
| 1072 void* user_data) | |
| 1073 { | |
| 1074 assert(obj->is_typeArray(), "not a primitive array"); | |
| 1075 | |
| 1076 // get base address of first element | |
| 1077 typeArrayOop array = typeArrayOop(obj); | |
| 1078 BasicType type = typeArrayKlass::cast(array->klass())->element_type(); | |
| 1079 void* elements = array->base(type); | |
| 1080 | |
| 1081 // jvmtiPrimitiveType is defined so this mapping is always correct | |
| 1082 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
| 1083 | |
| 1084 return (*cb)(wrapper->klass_tag(), | |
| 1085 wrapper->obj_size(), | |
| 1086 wrapper->obj_tag_p(), | |
| 1087 (jint)array->length(), | |
| 1088 elem_type, | |
| 1089 elements, | |
| 1090 user_data); | |
| 1091 } | |
| 1092 | |
| 1093 // helper function to invoke the primitive field callback for all static fields | |
| 1094 // of a given class | |
| 1095 static jint invoke_primitive_field_callback_for_static_fields | |
| 1096 (CallbackWrapper* wrapper, | |
| 1097 oop obj, | |
| 1098 jvmtiPrimitiveFieldCallback cb, | |
| 1099 void* user_data) | |
| 1100 { | |
| 1101 // for static fields only the index will be set | |
| 1102 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 1103 | |
| 1142 | 1104 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
| 0 | 1105 if (java_lang_Class::is_primitive(obj)) { |
| 1106 return 0; | |
| 1107 } | |
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1108 Klass* klass = java_lang_Class::as_Klass(obj); |
| 0 | 1109 |
| 1110 // ignore classes for object and type arrays | |
| 1111 if (!klass->oop_is_instance()) { | |
| 1112 return 0; | |
| 1113 } | |
| 1114 | |
| 1115 // ignore classes which aren't linked yet | |
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1116 InstanceKlass* ik = InstanceKlass::cast(klass); |
| 0 | 1117 if (!ik->is_linked()) { |
| 1118 return 0; | |
| 1119 } | |
| 1120 | |
| 1121 // get the field map | |
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1122 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
| 0 | 1123 |
| 1124 // invoke the callback for each static primitive field | |
| 1125 for (int i=0; i<field_map->field_count(); i++) { | |
| 1126 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 1127 | |
| 1128 // ignore non-primitive fields | |
| 1129 char type = field->field_type(); | |
| 1130 if (!is_primitive_field_type(type)) { | |
| 1131 continue; | |
| 1132 } | |
| 1133 // one-to-one mapping | |
| 1134 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 1135 | |
| 1136 // get offset and field value | |
| 1137 int offset = field->field_offset(); | |
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1138 address addr = (address)klass + offset; |
| 0 | 1139 jvalue value; |
| 1140 copy_to_jvalue(&value, addr, value_type); | |
| 1141 | |
| 1142 // field index | |
| 1143 reference_info.field.index = field->field_index(); | |
| 1144 | |
| 1145 // invoke the callback | |
| 1146 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
| 1147 &reference_info, | |
| 1148 wrapper->klass_tag(), | |
| 1149 wrapper->obj_tag_p(), | |
| 1150 value, | |
| 1151 value_type, | |
| 1152 user_data); | |
| 1153 if (res & JVMTI_VISIT_ABORT) { | |
| 1154 delete field_map; | |
| 1155 return res; | |
| 1156 } | |
| 1157 } | |
| 1158 | |
| 1159 delete field_map; | |
| 1160 return 0; | |
| 1161 } | |
| 1162 | |
| 1163 // helper function to invoke the primitive field callback for all instance fields | |
| 1164 // of a given object | |
| 1165 static jint invoke_primitive_field_callback_for_instance_fields( | |
| 1166 CallbackWrapper* wrapper, | |
| 1167 oop obj, | |
| 1168 jvmtiPrimitiveFieldCallback cb, | |
| 1169 void* user_data) | |
| 1170 { | |
| 1171 // for instance fields only the index will be set | |
| 1172 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 1173 | |
| 1174 // get the map of the instance fields | |
| 1175 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
| 1176 | |
| 1177 // invoke the callback for each instance primitive field | |
| 1178 for (int i=0; i<fields->field_count(); i++) { | |
| 1179 ClassFieldDescriptor* field = fields->field_at(i); | |
| 1180 | |
| 1181 // ignore non-primitive fields | |
| 1182 char type = field->field_type(); | |
| 1183 if (!is_primitive_field_type(type)) { | |
| 1184 continue; | |
| 1185 } | |
| 1186 // one-to-one mapping | |
| 1187 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 1188 | |
| 1189 // get offset and field value | |
| 1190 int offset = field->field_offset(); | |
| 1191 address addr = (address)obj + offset; | |
| 1192 jvalue value; | |
| 1193 copy_to_jvalue(&value, addr, value_type); | |
| 1194 | |
| 1195 // field index | |
| 1196 reference_info.field.index = field->field_index(); | |
| 1197 | |
| 1198 // invoke the callback | |
| 1199 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
| 1200 &reference_info, | |
| 1201 wrapper->klass_tag(), | |
| 1202 wrapper->obj_tag_p(), | |
| 1203 value, | |
| 1204 value_type, | |
| 1205 user_data); | |
| 1206 if (res & JVMTI_VISIT_ABORT) { | |
| 1207 return res; | |
| 1208 } | |
| 1209 } | |
| 1210 return 0; | |
| 1211 } | |
| 1212 | |
| 1213 | |
| 1214 // VM operation to iterate over all objects in the heap (both reachable | |
| 1215 // and unreachable) | |
| 1216 class VM_HeapIterateOperation: public VM_Operation { | |
| 1217 private: | |
| 1218 ObjectClosure* _blk; | |
| 1219 public: | |
| 1220 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
| 1221 | |
| 1222 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
| 1223 void doit() { | |
| 1224 // allows class files maps to be cached during iteration | |
| 1225 ClassFieldMapCacheMark cm; | |
| 1226 | |
| 1227 // make sure that heap is parsable (fills TLABs with filler objects) | |
| 1228 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
| 1229 | |
| 1230 // Verify heap before iteration - if the heap gets corrupted then | |
| 1231 // JVMTI's IterateOverHeap will crash. | |
| 1232 if (VerifyBeforeIteration) { | |
| 1233 Universe::verify(); | |
| 1234 } | |
| 1235 | |
| 1236 // do the iteration | |
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1237 // If this operation encounters a bad object when using CMS, |
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1238 // consider using safe_object_iterate() which avoids perm gen |
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1239 // objects that may contain bad references. |
| 0 | 1240 Universe::heap()->object_iterate(_blk); |
| 1241 } | |
| 1242 | |
| 1243 }; | |
| 1244 | |
| 1245 | |
| 1246 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
| 1247 // IterateOverInstancesOfClass functions | |
| 1248 class IterateOverHeapObjectClosure: public ObjectClosure { | |
| 1249 private: | |
| 1250 JvmtiTagMap* _tag_map; | |
| 1251 KlassHandle _klass; | |
| 1252 jvmtiHeapObjectFilter _object_filter; | |
| 1253 jvmtiHeapObjectCallback _heap_object_callback; | |
| 1254 const void* _user_data; | |
| 1255 | |
| 1256 // accessors | |
| 1257 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 1258 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
| 1259 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
| 1260 KlassHandle klass() const { return _klass; } | |
| 1261 const void* user_data() const { return _user_data; } | |
| 1262 | |
| 1263 // indicates if iteration has been aborted | |
| 1264 bool _iteration_aborted; | |
| 1265 bool is_iteration_aborted() const { return _iteration_aborted; } | |
| 1266 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
| 1267 | |
| 1268 public: | |
| 1269 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
| 1270 KlassHandle klass, | |
| 1271 jvmtiHeapObjectFilter object_filter, | |
| 1272 jvmtiHeapObjectCallback heap_object_callback, | |
| 1273 const void* user_data) : | |
| 1274 _tag_map(tag_map), | |
| 1275 _klass(klass), | |
| 1276 _object_filter(object_filter), | |
| 1277 _heap_object_callback(heap_object_callback), | |
| 1278 _user_data(user_data), | |
| 1279 _iteration_aborted(false) | |
| 1280 { | |
| 1281 } | |
| 1282 | |
| 1283 void do_object(oop o); | |
| 1284 }; | |
| 1285 | |
| 1286 // invoked for each object in the heap | |
| 1287 void IterateOverHeapObjectClosure::do_object(oop o) { | |
| 1288 // check if iteration has been halted | |
| 1289 if (is_iteration_aborted()) return; | |
| 1290 | |
| 1291 // ignore any objects that aren't visible to profiler | |
| 1292 if (!ServiceUtil::visible_oop(o)) return; | |
| 1293 | |
| 1294 // instanceof check when filtering by klass | |
| 1295 if (!klass().is_null() && !o->is_a(klass()())) { | |
| 1296 return; | |
| 1297 } | |
| 1298 // prepare for the calllback | |
| 1299 CallbackWrapper wrapper(tag_map(), o); | |
| 1300 | |
| 1301 // if the object is tagged and we're only interested in untagged objects | |
| 1302 // then don't invoke the callback. Similiarly, if the object is untagged | |
| 1303 // and we're only interested in tagged objects we skip the callback. | |
| 1304 if (wrapper.obj_tag() != 0) { | |
| 1305 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
| 1306 } else { | |
| 1307 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
| 1308 } | |
| 1309 | |
| 1310 // invoke the agent's callback | |
| 1311 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
| 1312 wrapper.obj_size(), | |
| 1313 wrapper.obj_tag_p(), | |
| 1314 (void*)user_data()); | |
| 1315 if (control == JVMTI_ITERATION_ABORT) { | |
| 1316 set_iteration_aborted(true); | |
| 1317 } | |
| 1318 } | |
| 1319 | |
| 1320 // An ObjectClosure used to support the IterateThroughHeap function | |
| 1321 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
| 1322 private: | |
| 1323 JvmtiTagMap* _tag_map; | |
| 1324 KlassHandle _klass; | |
| 1325 int _heap_filter; | |
| 1326 const jvmtiHeapCallbacks* _callbacks; | |
| 1327 const void* _user_data; | |
| 1328 | |
| 1329 // accessor functions | |
| 1330 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 1331 int heap_filter() const { return _heap_filter; } | |
| 1332 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
| 1333 KlassHandle klass() const { return _klass; } | |
| 1334 const void* user_data() const { return _user_data; } | |
| 1335 | |
| 1336 // indicates if the iteration has been aborted | |
| 1337 bool _iteration_aborted; | |
| 1338 bool is_iteration_aborted() const { return _iteration_aborted; } | |
| 1339 | |
| 1340 // used to check the visit control flags. If the abort flag is set | |
| 1341 // then we set the iteration aborted flag so that the iteration completes | |
| 1342 // without processing any further objects | |
| 1343 bool check_flags_for_abort(jint flags) { | |
| 1344 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
| 1345 if (is_abort) { | |
| 1346 _iteration_aborted = true; | |
| 1347 } | |
| 1348 return is_abort; | |
| 1349 } | |
| 1350 | |
| 1351 public: | |
| 1352 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
| 1353 KlassHandle klass, | |
| 1354 int heap_filter, | |
| 1355 const jvmtiHeapCallbacks* heap_callbacks, | |
| 1356 const void* user_data) : | |
| 1357 _tag_map(tag_map), | |
| 1358 _klass(klass), | |
| 1359 _heap_filter(heap_filter), | |
| 1360 _callbacks(heap_callbacks), | |
| 1361 _user_data(user_data), | |
| 1362 _iteration_aborted(false) | |
| 1363 { | |
| 1364 } | |
| 1365 | |
| 1366 void do_object(oop o); | |
| 1367 }; | |
| 1368 | |
| 1369 // invoked for each object in the heap | |
| 1370 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
| 1371 // check if iteration has been halted | |
| 1372 if (is_iteration_aborted()) return; | |
| 1373 | |
| 1374 // ignore any objects that aren't visible to profiler | |
| 1375 if (!ServiceUtil::visible_oop(obj)) return; | |
| 1376 | |
| 1377 // apply class filter | |
| 1378 if (is_filtered_by_klass_filter(obj, klass())) return; | |
| 1379 | |
| 1380 // prepare for callback | |
| 1381 CallbackWrapper wrapper(tag_map(), obj); | |
| 1382 | |
| 1383 // check if filtered by the heap filter | |
| 1384 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
| 1385 return; | |
| 1386 } | |
| 1387 | |
| 1388 // for arrays we need the length, otherwise -1 | |
| 1389 bool is_array = obj->is_array(); | |
| 1390 int len = is_array ? arrayOop(obj)->length() : -1; | |
| 1391 | |
| 1392 // invoke the object callback (if callback is provided) | |
| 1393 if (callbacks()->heap_iteration_callback != NULL) { | |
| 1394 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
| 1395 jint res = (*cb)(wrapper.klass_tag(), | |
| 1396 wrapper.obj_size(), | |
| 1397 wrapper.obj_tag_p(), | |
| 1398 (jint)len, | |
| 1399 (void*)user_data()); | |
| 1400 if (check_flags_for_abort(res)) return; | |
| 1401 } | |
| 1402 | |
| 1403 // for objects and classes we report primitive fields if callback provided | |
| 1404 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
| 1405 jint res; | |
| 1406 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
| 1142 | 1407 if (obj->klass() == SystemDictionary::Class_klass()) { |
| 0 | 1408 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
| 1409 obj, | |
| 1410 cb, | |
| 1411 (void*)user_data()); | |
| 1412 } else { | |
| 1413 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
| 1414 obj, | |
| 1415 cb, | |
| 1416 (void*)user_data()); | |
| 1417 } | |
| 1418 if (check_flags_for_abort(res)) return; | |
| 1419 } | |
| 1420 | |
| 1421 // string callback | |
| 1422 if (!is_array && | |
| 1423 callbacks()->string_primitive_value_callback != NULL && | |
| 1142 | 1424 obj->klass() == SystemDictionary::String_klass()) { |
| 0 | 1425 jint res = invoke_string_value_callback( |
| 1426 callbacks()->string_primitive_value_callback, | |
| 1427 &wrapper, | |
| 1428 obj, | |
| 1429 (void*)user_data() ); | |
| 1430 if (check_flags_for_abort(res)) return; | |
| 1431 } | |
| 1432 | |
| 1433 // array callback | |
| 1434 if (is_array && | |
| 1435 callbacks()->array_primitive_value_callback != NULL && | |
| 1436 obj->is_typeArray()) { | |
| 1437 jint res = invoke_array_primitive_value_callback( | |
| 1438 callbacks()->array_primitive_value_callback, | |
| 1439 &wrapper, | |
| 1440 obj, | |
| 1441 (void*)user_data() ); | |
| 1442 if (check_flags_for_abort(res)) return; | |
| 1443 } | |
| 1444 }; | |
| 1445 | |
| 1446 | |
| 1447 // Deprecated function to iterate over all objects in the heap | |
| 1448 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
| 1449 KlassHandle klass, | |
| 1450 jvmtiHeapObjectCallback heap_object_callback, | |
| 1451 const void* user_data) | |
| 1452 { | |
| 1453 MutexLocker ml(Heap_lock); | |
| 1454 IterateOverHeapObjectClosure blk(this, | |
| 1455 klass, | |
| 1456 object_filter, | |
| 1457 heap_object_callback, | |
| 1458 user_data); | |
| 1459 VM_HeapIterateOperation op(&blk); | |
| 1460 VMThread::execute(&op); | |
| 1461 } | |
| 1462 | |
| 1463 | |
| 1464 // Iterates over all objects in the heap | |
| 1465 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
| 1466 KlassHandle klass, | |
| 1467 const jvmtiHeapCallbacks* callbacks, | |
| 1468 const void* user_data) | |
| 1469 { | |
| 1470 MutexLocker ml(Heap_lock); | |
| 1471 IterateThroughHeapObjectClosure blk(this, | |
| 1472 klass, | |
| 1473 heap_filter, | |
| 1474 callbacks, | |
| 1475 user_data); | |
| 1476 VM_HeapIterateOperation op(&blk); | |
| 1477 VMThread::execute(&op); | |
| 1478 } | |
| 1479 | |
| 1480 // support class for get_objects_with_tags | |
| 1481 | |
| 1482 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
| 1483 private: | |
| 1484 JvmtiEnv* _env; | |
| 1485 jlong* _tags; | |
| 1486 jint _tag_count; | |
| 1487 | |
| 1488 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
| 1489 GrowableArray<uint64_t>* _tag_results; // collected tags | |
| 1490 | |
| 1491 public: | |
| 1492 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
| 1493 _env = env; | |
| 1494 _tags = (jlong*)tags; | |
| 1495 _tag_count = tag_count; | |
| 6197 | 1496 _object_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jobject>(1,true); |
| 1497 _tag_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<uint64_t>(1,true); | |
| 0 | 1498 } |
| 1499 | |
| 1500 ~TagObjectCollector() { | |
| 1501 delete _object_results; | |
| 1502 delete _tag_results; | |
| 1503 } | |
| 1504 | |
| 1505 // for each tagged object check if the tag value matches | |
| 1506 // - if it matches then we create a JNI local reference to the object | |
| 1507 // and record the reference and tag value. | |
| 1508 // | |
| 1509 void do_entry(JvmtiTagHashmapEntry* entry) { | |
| 1510 for (int i=0; i<_tag_count; i++) { | |
| 1511 if (_tags[i] == entry->tag()) { | |
|
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1512 oop o = entry->object(); |
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1513 assert(o != NULL && Universe::heap()->is_in_reserved(o), "sanity check"); |
| 0 | 1514 jobject ref = JNIHandles::make_local(JavaThread::current(), o); |
| 1515 _object_results->append(ref); | |
| 1516 _tag_results->append((uint64_t)entry->tag()); | |
| 1517 } | |
| 1518 } | |
| 1519 } | |
| 1520 | |
| 1521 // return the results from the collection | |
| 1522 // | |
| 1523 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
| 1524 jvmtiError error; | |
| 1525 int count = _object_results->length(); | |
| 1526 assert(count >= 0, "sanity check"); | |
| 1527 | |
| 1528 // if object_result_ptr is not NULL then allocate the result and copy | |
| 1529 // in the object references. | |
| 1530 if (object_result_ptr != NULL) { | |
| 1531 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
| 1532 if (error != JVMTI_ERROR_NONE) { | |
| 1533 return error; | |
| 1534 } | |
| 1535 for (int i=0; i<count; i++) { | |
| 1536 (*object_result_ptr)[i] = _object_results->at(i); | |
| 1537 } | |
| 1538 } | |
| 1539 | |
| 1540 // if tag_result_ptr is not NULL then allocate the result and copy | |
| 1541 // in the tag values. | |
| 1542 if (tag_result_ptr != NULL) { | |
| 1543 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
| 1544 if (error != JVMTI_ERROR_NONE) { | |
| 1545 if (object_result_ptr != NULL) { | |
| 1546 _env->Deallocate((unsigned char*)object_result_ptr); | |
| 1547 } | |
| 1548 return error; | |
| 1549 } | |
| 1550 for (int i=0; i<count; i++) { | |
| 1551 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
| 1552 } | |
| 1553 } | |
| 1554 | |
| 1555 *count_ptr = count; | |
| 1556 return JVMTI_ERROR_NONE; | |
| 1557 } | |
| 1558 }; | |
| 1559 | |
| 1560 // return the list of objects with the specified tags | |
| 1561 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
| 1562 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
| 1563 | |
| 1564 TagObjectCollector collector(env(), tags, count); | |
| 1565 { | |
| 1566 // iterate over all tagged objects | |
| 1567 MutexLocker ml(lock()); | |
| 1568 entry_iterate(&collector); | |
| 1569 } | |
| 1570 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
| 1571 } | |
| 1572 | |
| 1573 | |
| 1574 // ObjectMarker is used to support the marking objects when walking the | |
| 1575 // heap. | |
| 1576 // | |
| 1577 // This implementation uses the existing mark bits in an object for | |
| 1578 // marking. Objects that are marked must later have their headers restored. | |
| 1579 // As most objects are unlocked and don't have their identity hash computed | |
| 1580 // we don't have to save their headers. Instead we save the headers that | |
| 1581 // are "interesting". Later when the headers are restored this implementation | |
| 1582 // restores all headers to their initial value and then restores the few | |
| 1583 // objects that had interesting headers. | |
| 1584 // | |
| 1585 // Future work: This implementation currently uses growable arrays to save | |
| 1586 // the oop and header of interesting objects. As an optimization we could | |
| 1587 // use the same technique as the GC and make use of the unused area | |
| 1588 // between top() and end(). | |
| 1589 // | |
| 1590 | |
| 1591 // An ObjectClosure used to restore the mark bits of an object | |
| 1592 class RestoreMarksClosure : public ObjectClosure { | |
| 1593 public: | |
| 1594 void do_object(oop o) { | |
| 1595 if (o != NULL) { | |
| 1596 markOop mark = o->mark(); | |
| 1597 if (mark->is_marked()) { | |
| 1598 o->init_mark(); | |
| 1599 } | |
| 1600 } | |
| 1601 } | |
| 1602 }; | |
| 1603 | |
| 1604 // ObjectMarker provides the mark and visited functions | |
| 1605 class ObjectMarker : AllStatic { | |
| 1606 private: | |
| 1607 // saved headers | |
| 1608 static GrowableArray<oop>* _saved_oop_stack; | |
| 1609 static GrowableArray<markOop>* _saved_mark_stack; | |
| 3815 | 1610 static bool _needs_reset; // do we need to reset mark bits? |
| 0 | 1611 |
| 1612 public: | |
| 1613 static void init(); // initialize | |
| 1614 static void done(); // clean-up | |
| 1615 | |
| 1616 static inline void mark(oop o); // mark an object | |
| 1617 static inline bool visited(oop o); // check if object has been visited | |
| 3815 | 1618 |
| 1619 static inline bool needs_reset() { return _needs_reset; } | |
| 1620 static inline void set_needs_reset(bool v) { _needs_reset = v; } | |
| 0 | 1621 }; |
| 1622 | |
| 1623 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
| 1624 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
| 3815 | 1625 bool ObjectMarker::_needs_reset = true; // need to reset mark bits by default |
| 0 | 1626 |
| 1627 // initialize ObjectMarker - prepares for object marking | |
| 1628 void ObjectMarker::init() { | |
| 1629 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 1630 | |
| 1631 // prepare heap for iteration | |
| 1632 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
| 1633 | |
| 1634 // create stacks for interesting headers | |
| 6197 | 1635 _saved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markOop>(4000, true); |
| 1636 _saved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(4000, true); | |
| 0 | 1637 |
| 1638 if (UseBiasedLocking) { | |
| 1639 BiasedLocking::preserve_marks(); | |
| 1640 } | |
| 1641 } | |
| 1642 | |
| 1643 // Object marking is done so restore object headers | |
| 1644 void ObjectMarker::done() { | |
| 1645 // iterate over all objects and restore the mark bits to | |
| 1646 // their initial value | |
| 1647 RestoreMarksClosure blk; | |
| 3815 | 1648 if (needs_reset()) { |
| 1649 Universe::heap()->object_iterate(&blk); | |
| 1650 } else { | |
| 1651 // We don't need to reset mark bits on this call, but reset the | |
| 1652 // flag to the default for the next call. | |
| 1653 set_needs_reset(true); | |
| 1654 } | |
| 0 | 1655 |
| 1656 // now restore the interesting headers | |
| 1657 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
| 1658 oop o = _saved_oop_stack->at(i); | |
| 1659 markOop mark = _saved_mark_stack->at(i); | |
| 1660 o->set_mark(mark); | |
| 1661 } | |
| 1662 | |
| 1663 if (UseBiasedLocking) { | |
| 1664 BiasedLocking::restore_marks(); | |
| 1665 } | |
| 1666 | |
| 1667 // free the stacks | |
| 1668 delete _saved_oop_stack; | |
| 1669 delete _saved_mark_stack; | |
| 1670 } | |
| 1671 | |
| 1672 // mark an object | |
| 1673 inline void ObjectMarker::mark(oop o) { | |
| 1674 assert(Universe::heap()->is_in(o), "sanity check"); | |
| 1675 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
| 1676 | |
| 1677 // object's mark word | |
| 1678 markOop mark = o->mark(); | |
| 1679 | |
| 1680 if (mark->must_be_preserved(o)) { | |
| 1681 _saved_mark_stack->push(mark); | |
| 1682 _saved_oop_stack->push(o); | |
| 1683 } | |
| 1684 | |
| 1685 // mark the object | |
| 1686 o->set_mark(markOopDesc::prototype()->set_marked()); | |
| 1687 } | |
| 1688 | |
| 1689 // return true if object is marked | |
| 1690 inline bool ObjectMarker::visited(oop o) { | |
| 1691 return o->mark()->is_marked(); | |
| 1692 } | |
| 1693 | |
| 1694 // Stack allocated class to help ensure that ObjectMarker is used | |
| 1695 // correctly. Constructor initializes ObjectMarker, destructor calls | |
| 1696 // ObjectMarker's done() function to restore object headers. | |
| 1697 class ObjectMarkerController : public StackObj { | |
| 1698 public: | |
| 1699 ObjectMarkerController() { | |
| 1700 ObjectMarker::init(); | |
| 1701 } | |
| 1702 ~ObjectMarkerController() { | |
| 1703 ObjectMarker::done(); | |
| 1704 } | |
| 1705 }; | |
| 1706 | |
| 1707 | |
| 1708 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
| 1709 // (not performance critical as only used for roots) | |
| 1710 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
| 1711 switch (kind) { | |
| 1712 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
| 1713 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
| 1714 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
| 1715 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
| 1716 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
| 1717 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
| 1718 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
| 1719 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
| 1720 } | |
| 1721 } | |
| 1722 | |
| 1723 // Base class for all heap walk contexts. The base class maintains a flag | |
| 1724 // to indicate if the context is valid or not. | |
| 1725 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
| 1726 private: | |
| 1727 bool _valid; | |
| 1728 public: | |
| 1729 HeapWalkContext(bool valid) { _valid = valid; } | |
| 1730 void invalidate() { _valid = false; } | |
| 1731 bool is_valid() const { return _valid; } | |
| 1732 }; | |
| 1733 | |
| 1734 // A basic heap walk context for the deprecated heap walking functions. | |
| 1735 // The context for a basic heap walk are the callbacks and fields used by | |
| 1736 // the referrer caching scheme. | |
| 1737 class BasicHeapWalkContext: public HeapWalkContext { | |
| 1738 private: | |
| 1739 jvmtiHeapRootCallback _heap_root_callback; | |
| 1740 jvmtiStackReferenceCallback _stack_ref_callback; | |
| 1741 jvmtiObjectReferenceCallback _object_ref_callback; | |
| 1742 | |
| 1743 // used for caching | |
| 1744 oop _last_referrer; | |
| 1745 jlong _last_referrer_tag; | |
| 1746 | |
| 1747 public: | |
| 1748 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
| 1749 | |
| 1750 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
| 1751 jvmtiStackReferenceCallback stack_ref_callback, | |
| 1752 jvmtiObjectReferenceCallback object_ref_callback) : | |
| 1753 HeapWalkContext(true), | |
| 1754 _heap_root_callback(heap_root_callback), | |
| 1755 _stack_ref_callback(stack_ref_callback), | |
| 1756 _object_ref_callback(object_ref_callback), | |
| 1757 _last_referrer(NULL), | |
| 1758 _last_referrer_tag(0) { | |
| 1759 } | |
| 1760 | |
| 1761 // accessors | |
| 1762 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
| 1763 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
| 1764 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
| 1765 | |
| 1766 oop last_referrer() const { return _last_referrer; } | |
| 1767 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
| 1768 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
| 1769 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
| 1770 }; | |
| 1771 | |
| 1772 // The advanced heap walk context for the FollowReferences functions. | |
| 1773 // The context is the callbacks, and the fields used for filtering. | |
| 1774 class AdvancedHeapWalkContext: public HeapWalkContext { | |
| 1775 private: | |
| 1776 jint _heap_filter; | |
| 1777 KlassHandle _klass_filter; | |
| 1778 const jvmtiHeapCallbacks* _heap_callbacks; | |
| 1779 | |
| 1780 public: | |
| 1781 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
| 1782 | |
| 1783 AdvancedHeapWalkContext(jint heap_filter, | |
| 1784 KlassHandle klass_filter, | |
| 1785 const jvmtiHeapCallbacks* heap_callbacks) : | |
| 1786 HeapWalkContext(true), | |
| 1787 _heap_filter(heap_filter), | |
| 1788 _klass_filter(klass_filter), | |
| 1789 _heap_callbacks(heap_callbacks) { | |
| 1790 } | |
| 1791 | |
| 1792 // accessors | |
| 1793 jint heap_filter() const { return _heap_filter; } | |
| 1794 KlassHandle klass_filter() const { return _klass_filter; } | |
| 1795 | |
| 1796 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
| 1797 return _heap_callbacks->heap_reference_callback; | |
| 1798 }; | |
| 1799 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
| 1800 return _heap_callbacks->primitive_field_callback; | |
| 1801 } | |
| 1802 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
| 1803 return _heap_callbacks->array_primitive_value_callback; | |
| 1804 } | |
| 1805 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
| 1806 return _heap_callbacks->string_primitive_value_callback; | |
| 1807 } | |
| 1808 }; | |
| 1809 | |
| 1810 // The CallbackInvoker is a class with static functions that the heap walk can call | |
| 1811 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
| 1812 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
| 1813 // mode is for the newer FollowReferences function which supports a lot of | |
| 1814 // additional callbacks. | |
| 1815 class CallbackInvoker : AllStatic { | |
| 1816 private: | |
| 1817 // heap walk styles | |
| 1818 enum { basic, advanced }; | |
| 1819 static int _heap_walk_type; | |
| 1820 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
| 1821 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
| 1822 | |
| 1823 // context for basic style heap walk | |
| 1824 static BasicHeapWalkContext _basic_context; | |
| 1825 static BasicHeapWalkContext* basic_context() { | |
| 1826 assert(_basic_context.is_valid(), "invalid"); | |
| 1827 return &_basic_context; | |
| 1828 } | |
| 1829 | |
| 1830 // context for advanced style heap walk | |
| 1831 static AdvancedHeapWalkContext _advanced_context; | |
| 1832 static AdvancedHeapWalkContext* advanced_context() { | |
| 1833 assert(_advanced_context.is_valid(), "invalid"); | |
| 1834 return &_advanced_context; | |
| 1835 } | |
| 1836 | |
| 1837 // context needed for all heap walks | |
| 1838 static JvmtiTagMap* _tag_map; | |
| 1839 static const void* _user_data; | |
| 1840 static GrowableArray<oop>* _visit_stack; | |
| 1841 | |
| 1842 // accessors | |
| 1843 static JvmtiTagMap* tag_map() { return _tag_map; } | |
| 1844 static const void* user_data() { return _user_data; } | |
| 1845 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
| 1846 | |
| 1847 // if the object hasn't been visited then push it onto the visit stack | |
| 1848 // so that it will be visited later | |
| 1849 static inline bool check_for_visit(oop obj) { | |
| 1850 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
| 1851 return true; | |
| 1852 } | |
| 1853 | |
| 1854 // invoke basic style callbacks | |
| 1855 static inline bool invoke_basic_heap_root_callback | |
| 1856 (jvmtiHeapRootKind root_kind, oop obj); | |
| 1857 static inline bool invoke_basic_stack_ref_callback | |
| 1858 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
| 1859 int slot, oop obj); | |
| 1860 static inline bool invoke_basic_object_reference_callback | |
| 1861 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
| 1862 | |
| 1863 // invoke advanced style callbacks | |
| 1864 static inline bool invoke_advanced_heap_root_callback | |
| 1865 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
| 1866 static inline bool invoke_advanced_stack_ref_callback | |
| 1867 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
| 1868 jmethodID method, jlocation bci, jint slot, oop obj); | |
| 1869 static inline bool invoke_advanced_object_reference_callback | |
| 1870 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
| 1871 | |
| 1872 // used to report the value of primitive fields | |
| 1873 static inline bool report_primitive_field | |
| 1874 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
| 1875 | |
| 1876 public: | |
| 1877 // initialize for basic mode | |
| 1878 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
| 1879 GrowableArray<oop>* visit_stack, | |
| 1880 const void* user_data, | |
| 1881 BasicHeapWalkContext context); | |
| 1882 | |
| 1883 // initialize for advanced mode | |
| 1884 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
| 1885 GrowableArray<oop>* visit_stack, | |
| 1886 const void* user_data, | |
| 1887 AdvancedHeapWalkContext context); | |
| 1888 | |
| 1889 // functions to report roots | |
| 1890 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
| 1891 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
| 1892 jmethodID m, oop o); | |
| 1893 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
| 1894 jmethodID method, jlocation bci, jint slot, oop o); | |
| 1895 | |
| 1896 // functions to report references | |
| 1897 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
| 1898 static inline bool report_class_reference(oop referrer, oop referree); | |
| 1899 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
| 1900 static inline bool report_signers_reference(oop referrer, oop referree); | |
| 1901 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
| 1902 static inline bool report_superclass_reference(oop referrer, oop referree); | |
| 1903 static inline bool report_interface_reference(oop referrer, oop referree); | |
| 1904 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
| 1905 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
| 1906 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
| 1907 static inline bool report_primitive_array_values(oop array); | |
| 1908 static inline bool report_string_value(oop str); | |
| 1909 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
| 1910 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
| 1911 }; | |
| 1912 | |
| 1913 // statics | |
| 1914 int CallbackInvoker::_heap_walk_type; | |
| 1915 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
| 1916 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
| 1917 JvmtiTagMap* CallbackInvoker::_tag_map; | |
| 1918 const void* CallbackInvoker::_user_data; | |
| 1919 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
| 1920 | |
| 1921 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
| 1922 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
| 1923 GrowableArray<oop>* visit_stack, | |
| 1924 const void* user_data, | |
| 1925 BasicHeapWalkContext context) { | |
| 1926 _tag_map = tag_map; | |
| 1927 _visit_stack = visit_stack; | |
| 1928 _user_data = user_data; | |
| 1929 _basic_context = context; | |
| 1930 _advanced_context.invalidate(); // will trigger assertion if used | |
| 1931 _heap_walk_type = basic; | |
| 1932 } | |
| 1933 | |
| 1934 // initialize for advanced heap walk (FollowReferences) | |
| 1935 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
| 1936 GrowableArray<oop>* visit_stack, | |
| 1937 const void* user_data, | |
| 1938 AdvancedHeapWalkContext context) { | |
| 1939 _tag_map = tag_map; | |
| 1940 _visit_stack = visit_stack; | |
| 1941 _user_data = user_data; | |
| 1942 _advanced_context = context; | |
| 1943 _basic_context.invalidate(); // will trigger assertion if used | |
| 1944 _heap_walk_type = advanced; | |
| 1945 } | |
| 1946 | |
| 1947 | |
| 1948 // invoke basic style heap root callback | |
| 1949 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
| 1950 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 1951 | |
| 1952 // if we heap roots should be reported | |
| 1953 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
| 1954 if (cb == NULL) { | |
| 1955 return check_for_visit(obj); | |
| 1956 } | |
| 1957 | |
| 1958 CallbackWrapper wrapper(tag_map(), obj); | |
| 1959 jvmtiIterationControl control = (*cb)(root_kind, | |
| 1960 wrapper.klass_tag(), | |
| 1961 wrapper.obj_size(), | |
| 1962 wrapper.obj_tag_p(), | |
| 1963 (void*)user_data()); | |
| 1964 // push root to visit stack when following references | |
| 1965 if (control == JVMTI_ITERATION_CONTINUE && | |
| 1966 basic_context()->object_ref_callback() != NULL) { | |
| 1967 visit_stack()->push(obj); | |
| 1968 } | |
| 1969 return control != JVMTI_ITERATION_ABORT; | |
| 1970 } | |
| 1971 | |
| 1972 // invoke basic style stack ref callback | |
| 1973 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
| 1974 jlong thread_tag, | |
| 1975 jint depth, | |
| 1976 jmethodID method, | |
| 1977 jint slot, | |
| 1978 oop obj) { | |
| 1979 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 1980 | |
| 1981 // if we stack refs should be reported | |
| 1982 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
| 1983 if (cb == NULL) { | |
| 1984 return check_for_visit(obj); | |
| 1985 } | |
| 1986 | |
| 1987 CallbackWrapper wrapper(tag_map(), obj); | |
| 1988 jvmtiIterationControl control = (*cb)(root_kind, | |
| 1989 wrapper.klass_tag(), | |
| 1990 wrapper.obj_size(), | |
| 1991 wrapper.obj_tag_p(), | |
| 1992 thread_tag, | |
| 1993 depth, | |
| 1994 method, | |
| 1995 slot, | |
| 1996 (void*)user_data()); | |
| 1997 // push root to visit stack when following references | |
| 1998 if (control == JVMTI_ITERATION_CONTINUE && | |
| 1999 basic_context()->object_ref_callback() != NULL) { | |
| 2000 visit_stack()->push(obj); | |
| 2001 } | |
| 2002 return control != JVMTI_ITERATION_ABORT; | |
| 2003 } | |
| 2004 | |
| 2005 // invoke basic style object reference callback | |
| 2006 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
| 2007 oop referrer, | |
| 2008 oop referree, | |
| 2009 jint index) { | |
| 2010 | |
| 2011 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
| 2012 assert(ServiceUtil::visible_oop(referree), "checking"); | |
| 2013 | |
| 2014 BasicHeapWalkContext* context = basic_context(); | |
| 2015 | |
| 2016 // callback requires the referrer's tag. If it's the same referrer | |
| 2017 // as the last call then we use the cached value. | |
| 2018 jlong referrer_tag; | |
| 2019 if (referrer == context->last_referrer()) { | |
| 2020 referrer_tag = context->last_referrer_tag(); | |
| 2021 } else { | |
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2022 referrer_tag = tag_for(tag_map(), referrer); |
| 0 | 2023 } |
| 2024 | |
| 2025 // do the callback | |
| 2026 CallbackWrapper wrapper(tag_map(), referree); | |
| 2027 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
| 2028 jvmtiIterationControl control = (*cb)(ref_kind, | |
| 2029 wrapper.klass_tag(), | |
| 2030 wrapper.obj_size(), | |
| 2031 wrapper.obj_tag_p(), | |
| 2032 referrer_tag, | |
| 2033 index, | |
| 2034 (void*)user_data()); | |
| 2035 | |
| 2036 // record referrer and referrer tag. For self-references record the | |
| 2037 // tag value from the callback as this might differ from referrer_tag. | |
| 2038 context->set_last_referrer(referrer); | |
| 2039 if (referrer == referree) { | |
| 2040 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
| 2041 } else { | |
| 2042 context->set_last_referrer_tag(referrer_tag); | |
| 2043 } | |
| 2044 | |
| 2045 if (control == JVMTI_ITERATION_CONTINUE) { | |
| 2046 return check_for_visit(referree); | |
| 2047 } else { | |
| 2048 return control != JVMTI_ITERATION_ABORT; | |
| 2049 } | |
| 2050 } | |
| 2051 | |
| 2052 // invoke advanced style heap root callback | |
| 2053 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2054 oop obj) { | |
| 2055 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2056 | |
| 2057 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2058 | |
| 2059 // check that callback is provided | |
| 2060 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2061 if (cb == NULL) { | |
| 2062 return check_for_visit(obj); | |
| 2063 } | |
| 2064 | |
| 2065 // apply class filter | |
| 2066 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2067 return check_for_visit(obj); | |
| 2068 } | |
| 2069 | |
| 2070 // setup the callback wrapper | |
| 2071 CallbackWrapper wrapper(tag_map(), obj); | |
| 2072 | |
| 2073 // apply tag filter | |
| 2074 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2075 wrapper.klass_tag(), | |
| 2076 context->heap_filter())) { | |
| 2077 return check_for_visit(obj); | |
| 2078 } | |
| 2079 | |
| 2080 // for arrays we need the length, otherwise -1 | |
| 2081 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2082 | |
| 2083 // invoke the callback | |
| 2084 jint res = (*cb)(ref_kind, | |
| 2085 NULL, // referrer info | |
| 2086 wrapper.klass_tag(), | |
| 2087 0, // referrer_class_tag is 0 for heap root | |
| 2088 wrapper.obj_size(), | |
| 2089 wrapper.obj_tag_p(), | |
| 2090 NULL, // referrer_tag_p | |
| 2091 len, | |
| 2092 (void*)user_data()); | |
| 2093 if (res & JVMTI_VISIT_ABORT) { | |
| 2094 return false;// referrer class tag | |
| 2095 } | |
| 2096 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2097 check_for_visit(obj); | |
| 2098 } | |
| 2099 return true; | |
| 2100 } | |
| 2101 | |
| 2102 // report a reference from a thread stack to an object | |
| 2103 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2104 jlong thread_tag, | |
| 2105 jlong tid, | |
| 2106 int depth, | |
| 2107 jmethodID method, | |
| 2108 jlocation bci, | |
| 2109 jint slot, | |
| 2110 oop obj) { | |
| 2111 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2112 | |
| 2113 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2114 | |
| 2115 // check that callback is provider | |
| 2116 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2117 if (cb == NULL) { | |
| 2118 return check_for_visit(obj); | |
| 2119 } | |
| 2120 | |
| 2121 // apply class filter | |
| 2122 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2123 return check_for_visit(obj); | |
| 2124 } | |
| 2125 | |
| 2126 // setup the callback wrapper | |
| 2127 CallbackWrapper wrapper(tag_map(), obj); | |
| 2128 | |
| 2129 // apply tag filter | |
| 2130 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2131 wrapper.klass_tag(), | |
| 2132 context->heap_filter())) { | |
| 2133 return check_for_visit(obj); | |
| 2134 } | |
| 2135 | |
| 2136 // setup the referrer info | |
| 2137 jvmtiHeapReferenceInfo reference_info; | |
| 2138 reference_info.stack_local.thread_tag = thread_tag; | |
| 2139 reference_info.stack_local.thread_id = tid; | |
| 2140 reference_info.stack_local.depth = depth; | |
| 2141 reference_info.stack_local.method = method; | |
| 2142 reference_info.stack_local.location = bci; | |
| 2143 reference_info.stack_local.slot = slot; | |
| 2144 | |
| 2145 // for arrays we need the length, otherwise -1 | |
| 2146 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2147 | |
| 2148 // call into the agent | |
| 2149 int res = (*cb)(ref_kind, | |
| 2150 &reference_info, | |
| 2151 wrapper.klass_tag(), | |
| 2152 0, // referrer_class_tag is 0 for heap root (stack) | |
| 2153 wrapper.obj_size(), | |
| 2154 wrapper.obj_tag_p(), | |
| 2155 NULL, // referrer_tag is 0 for root | |
| 2156 len, | |
| 2157 (void*)user_data()); | |
| 2158 | |
| 2159 if (res & JVMTI_VISIT_ABORT) { | |
| 2160 return false; | |
| 2161 } | |
| 2162 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2163 check_for_visit(obj); | |
| 2164 } | |
| 2165 return true; | |
| 2166 } | |
| 2167 | |
| 2168 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
| 2169 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
| 2170 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
| 2171 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
| 2172 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
| 2173 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
| 2174 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
| 2175 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
| 2176 | |
| 2177 // invoke the object reference callback to report a reference | |
| 2178 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2179 oop referrer, | |
| 2180 oop obj, | |
| 2181 jint index) | |
| 2182 { | |
| 2183 // field index is only valid field in reference_info | |
| 2184 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 2185 | |
| 2186 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
| 2187 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2188 | |
| 2189 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2190 | |
| 2191 // check that callback is provider | |
| 2192 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2193 if (cb == NULL) { | |
| 2194 return check_for_visit(obj); | |
| 2195 } | |
| 2196 | |
| 2197 // apply class filter | |
| 2198 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2199 return check_for_visit(obj); | |
| 2200 } | |
| 2201 | |
| 2202 // setup the callback wrapper | |
| 2203 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
| 2204 | |
| 2205 // apply tag filter | |
| 2206 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2207 wrapper.klass_tag(), | |
| 2208 context->heap_filter())) { | |
| 2209 return check_for_visit(obj); | |
| 2210 } | |
| 2211 | |
| 2212 // field index is only valid field in reference_info | |
| 2213 reference_info.field.index = index; | |
| 2214 | |
| 2215 // for arrays we need the length, otherwise -1 | |
| 2216 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2217 | |
| 2218 // invoke the callback | |
| 2219 int res = (*cb)(ref_kind, | |
| 2220 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
| 2221 wrapper.klass_tag(), | |
| 2222 wrapper.referrer_klass_tag(), | |
| 2223 wrapper.obj_size(), | |
| 2224 wrapper.obj_tag_p(), | |
| 2225 wrapper.referrer_tag_p(), | |
| 2226 len, | |
| 2227 (void*)user_data()); | |
| 2228 | |
| 2229 if (res & JVMTI_VISIT_ABORT) { | |
| 2230 return false; | |
| 2231 } | |
| 2232 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2233 check_for_visit(obj); | |
| 2234 } | |
| 2235 return true; | |
| 2236 } | |
| 2237 | |
| 2238 // report a "simple root" | |
| 2239 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
| 2240 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
| 2241 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
| 2242 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2243 | |
| 2244 if (is_basic_heap_walk()) { | |
| 2245 // map to old style root kind | |
| 2246 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
| 2247 return invoke_basic_heap_root_callback(root_kind, obj); | |
| 2248 } else { | |
| 2249 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
| 2250 return invoke_advanced_heap_root_callback(kind, obj); | |
| 2251 } | |
| 2252 } | |
| 2253 | |
| 2254 | |
| 2255 // invoke the primitive array values | |
| 2256 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
| 2257 assert(obj->is_typeArray(), "not a primitive array"); | |
| 2258 | |
| 2259 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2260 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
| 2261 | |
| 2262 // apply class filter | |
| 2263 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2264 return true; | |
| 2265 } | |
| 2266 | |
| 2267 CallbackWrapper wrapper(tag_map(), obj); | |
| 2268 | |
| 2269 // apply tag filter | |
| 2270 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2271 wrapper.klass_tag(), | |
| 2272 context->heap_filter())) { | |
| 2273 return true; | |
| 2274 } | |
| 2275 | |
| 2276 // invoke the callback | |
| 2277 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
| 2278 &wrapper, | |
| 2279 obj, | |
| 2280 (void*)user_data()); | |
| 2281 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2282 } | |
| 2283 | |
| 2284 // invoke the string value callback | |
| 2285 inline bool CallbackInvoker::report_string_value(oop str) { | |
| 1142 | 2286 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
| 0 | 2287 |
| 2288 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2289 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
| 2290 | |
| 2291 // apply class filter | |
| 2292 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
| 2293 return true; | |
| 2294 } | |
| 2295 | |
| 2296 CallbackWrapper wrapper(tag_map(), str); | |
| 2297 | |
| 2298 // apply tag filter | |
| 2299 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2300 wrapper.klass_tag(), | |
| 2301 context->heap_filter())) { | |
| 2302 return true; | |
| 2303 } | |
| 2304 | |
| 2305 // invoke the callback | |
| 2306 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
| 2307 &wrapper, | |
| 2308 str, | |
| 2309 (void*)user_data()); | |
| 2310 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2311 } | |
| 2312 | |
| 2313 // invoke the primitive field callback | |
| 2314 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
| 2315 oop obj, | |
| 2316 jint index, | |
| 2317 address addr, | |
| 2318 char type) | |
| 2319 { | |
| 2320 // for primitive fields only the index will be set | |
| 2321 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 2322 | |
| 2323 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2324 assert(context->primitive_field_callback() != NULL, "no callback"); | |
| 2325 | |
| 2326 // apply class filter | |
| 2327 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2328 return true; | |
| 2329 } | |
| 2330 | |
| 2331 CallbackWrapper wrapper(tag_map(), obj); | |
| 2332 | |
| 2333 // apply tag filter | |
| 2334 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2335 wrapper.klass_tag(), | |
| 2336 context->heap_filter())) { | |
| 2337 return true; | |
| 2338 } | |
| 2339 | |
| 2340 // the field index in the referrer | |
| 2341 reference_info.field.index = index; | |
| 2342 | |
| 2343 // map the type | |
| 2344 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 2345 | |
| 2346 // setup the jvalue | |
| 2347 jvalue value; | |
| 2348 copy_to_jvalue(&value, addr, value_type); | |
| 2349 | |
| 2350 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
| 2351 int res = (*cb)(ref_kind, | |
| 2352 &reference_info, | |
| 2353 wrapper.klass_tag(), | |
| 2354 wrapper.obj_tag_p(), | |
| 2355 value, | |
| 2356 value_type, | |
| 2357 (void*)user_data()); | |
| 2358 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2359 } | |
| 2360 | |
| 2361 | |
| 2362 // instance field | |
| 2363 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
| 2364 jint index, | |
| 2365 address value, | |
| 2366 char type) { | |
| 2367 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
| 2368 obj, | |
| 2369 index, | |
| 2370 value, | |
| 2371 type); | |
| 2372 } | |
| 2373 | |
| 2374 // static field | |
| 2375 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
| 2376 jint index, | |
| 2377 address value, | |
| 2378 char type) { | |
| 2379 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
| 2380 obj, | |
| 2381 index, | |
| 2382 value, | |
| 2383 type); | |
| 2384 } | |
| 2385 | |
| 2386 // report a JNI local (root object) to the profiler | |
| 2387 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
| 2388 if (is_basic_heap_walk()) { | |
| 2389 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
| 2390 thread_tag, | |
| 2391 depth, | |
| 2392 m, | |
| 2393 -1, | |
| 2394 obj); | |
| 2395 } else { | |
| 2396 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
| 2397 thread_tag, tid, | |
| 2398 depth, | |
| 2399 m, | |
| 2400 (jlocation)-1, | |
| 2401 -1, | |
| 2402 obj); | |
| 2403 } | |
| 2404 } | |
| 2405 | |
| 2406 | |
| 2407 // report a local (stack reference, root object) | |
| 2408 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
| 2409 jlong tid, | |
| 2410 jint depth, | |
| 2411 jmethodID method, | |
| 2412 jlocation bci, | |
| 2413 jint slot, | |
| 2414 oop obj) { | |
| 2415 if (is_basic_heap_walk()) { | |
| 2416 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
| 2417 thread_tag, | |
| 2418 depth, | |
| 2419 method, | |
| 2420 slot, | |
| 2421 obj); | |
| 2422 } else { | |
| 2423 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
| 2424 thread_tag, | |
| 2425 tid, | |
| 2426 depth, | |
| 2427 method, | |
| 2428 bci, | |
| 2429 slot, | |
| 2430 obj); | |
| 2431 } | |
| 2432 } | |
| 2433 | |
| 2434 // report an object referencing a class. | |
| 2435 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
| 2436 if (is_basic_heap_walk()) { | |
| 2437 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
| 2438 } else { | |
| 2439 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
| 2440 } | |
| 2441 } | |
| 2442 | |
| 2443 // report a class referencing its class loader. | |
| 2444 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
| 2445 if (is_basic_heap_walk()) { | |
| 2446 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
| 2447 } else { | |
| 2448 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
| 2449 } | |
| 2450 } | |
| 2451 | |
| 2452 // report a class referencing its signers. | |
| 2453 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
| 2454 if (is_basic_heap_walk()) { | |
| 2455 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
| 2456 } else { | |
| 2457 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
| 2458 } | |
| 2459 } | |
| 2460 | |
| 2461 // report a class referencing its protection domain.. | |
| 2462 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
| 2463 if (is_basic_heap_walk()) { | |
| 2464 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
| 2465 } else { | |
| 2466 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
| 2467 } | |
| 2468 } | |
| 2469 | |
| 2470 // report a class referencing its superclass. | |
| 2471 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
| 2472 if (is_basic_heap_walk()) { | |
| 2473 // Send this to be consistent with past implementation | |
| 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_SUPERCLASS, referrer, referree, -1); | |
| 2477 } | |
| 2478 } | |
| 2479 | |
| 2480 // report a class referencing one of its interfaces. | |
| 2481 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
| 2482 if (is_basic_heap_walk()) { | |
| 2483 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
| 2484 } else { | |
| 2485 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
| 2486 } | |
| 2487 } | |
| 2488 | |
| 2489 // report a class referencing one of its static fields. | |
| 2490 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
| 2491 if (is_basic_heap_walk()) { | |
| 2492 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
| 2493 } else { | |
| 2494 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
| 2495 } | |
| 2496 } | |
| 2497 | |
| 2498 // report an array referencing an element object | |
| 2499 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
| 2500 if (is_basic_heap_walk()) { | |
| 2501 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
| 2502 } else { | |
| 2503 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
| 2504 } | |
| 2505 } | |
| 2506 | |
| 2507 // report an object referencing an instance field object | |
| 2508 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
| 2509 if (is_basic_heap_walk()) { | |
| 2510 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
| 2511 } else { | |
| 2512 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
| 2513 } | |
| 2514 } | |
| 2515 | |
| 2516 // report an array referencing an element object | |
| 2517 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
| 2518 if (is_basic_heap_walk()) { | |
| 2519 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
| 2520 } else { | |
| 2521 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
| 2522 } | |
| 2523 } | |
| 2524 | |
| 2525 // A supporting closure used to process simple roots | |
| 2526 class SimpleRootsClosure : public OopClosure { | |
| 2527 private: | |
| 2528 jvmtiHeapReferenceKind _kind; | |
| 2529 bool _continue; | |
| 2530 | |
| 2531 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
| 2532 | |
| 2533 public: | |
| 2534 void set_kind(jvmtiHeapReferenceKind kind) { | |
| 2535 _kind = kind; | |
| 2536 _continue = true; | |
| 2537 } | |
| 2538 | |
| 2539 inline bool stopped() { | |
| 2540 return !_continue; | |
| 2541 } | |
| 2542 | |
| 2543 void do_oop(oop* obj_p) { | |
| 2544 // iteration has terminated | |
| 2545 if (stopped()) { | |
| 2546 return; | |
| 2547 } | |
| 2548 | |
| 2549 // ignore null or deleted handles | |
| 2550 oop o = *obj_p; | |
| 2551 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
| 2552 return; | |
| 2553 } | |
| 2554 | |
| 2555 jvmtiHeapReferenceKind kind = root_kind(); | |
| 2556 | |
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2557 assert(Universe::heap()->is_in_reserved(o), "should be impossible"); |
| 0 | 2558 // SystemDictionary::always_strong_oops_do reports the application |
| 2559 // class loader as a root. We want this root to be reported as | |
| 2560 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
| 2561 if (o->is_instance() && root_kind() == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { | |
| 2562 kind = JVMTI_HEAP_REFERENCE_OTHER; | |
| 2563 } | |
| 2564 | |
| 2565 // some objects are ignored - in the case of simple | |
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2566 // roots it's mostly Symbol*s that we are skipping |
| 0 | 2567 // here. |
| 2568 if (!ServiceUtil::visible_oop(o)) { | |
| 2569 return; | |
| 2570 } | |
| 2571 | |
| 2572 // invoke the callback | |
| 2573 _continue = CallbackInvoker::report_simple_root(kind, o); | |
| 2574 | |
| 2575 } | |
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2576 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| 0 | 2577 }; |
| 2578 | |
| 2579 // A supporting closure used to process JNI locals | |
| 2580 class JNILocalRootsClosure : public OopClosure { | |
| 2581 private: | |
| 2582 jlong _thread_tag; | |
| 2583 jlong _tid; | |
| 2584 jint _depth; | |
| 2585 jmethodID _method; | |
| 2586 bool _continue; | |
| 2587 public: | |
| 2588 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
| 2589 _thread_tag = thread_tag; | |
| 2590 _tid = tid; | |
| 2591 _depth = depth; | |
| 2592 _method = method; | |
| 2593 _continue = true; | |
| 2594 } | |
| 2595 | |
| 2596 inline bool stopped() { | |
| 2597 return !_continue; | |
| 2598 } | |
| 2599 | |
| 2600 void do_oop(oop* obj_p) { | |
| 2601 // iteration has terminated | |
| 2602 if (stopped()) { | |
| 2603 return; | |
| 2604 } | |
| 2605 | |
| 2606 // ignore null or deleted handles | |
| 2607 oop o = *obj_p; | |
| 2608 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
| 2609 return; | |
| 2610 } | |
| 2611 | |
| 2612 if (!ServiceUtil::visible_oop(o)) { | |
| 2613 return; | |
| 2614 } | |
| 2615 | |
| 2616 // invoke the callback | |
| 2617 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
| 2618 } | |
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2619 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| 0 | 2620 }; |
| 2621 | |
| 2622 | |
| 2623 // A VM operation to iterate over objects that are reachable from | |
| 2624 // a set of roots or an initial object. | |
| 2625 // | |
| 2626 // For VM_HeapWalkOperation the set of roots used is :- | |
| 2627 // | |
| 2628 // - All JNI global references | |
| 2629 // - All inflated monitors | |
| 2630 // - All classes loaded by the boot class loader (or all classes | |
| 2631 // in the event that class unloading is disabled) | |
| 2632 // - All java threads | |
| 2633 // - For each java thread then all locals and JNI local references | |
| 2634 // on the thread's execution stack | |
| 2635 // - All visible/explainable objects from Universes::oops_do | |
| 2636 // | |
| 2637 class VM_HeapWalkOperation: public VM_Operation { | |
| 2638 private: | |
| 2639 enum { | |
| 2640 initial_visit_stack_size = 4000 | |
| 2641 }; | |
| 2642 | |
| 2643 bool _is_advanced_heap_walk; // indicates FollowReferences | |
| 2644 JvmtiTagMap* _tag_map; | |
| 2645 Handle _initial_object; | |
| 2646 GrowableArray<oop>* _visit_stack; // the visit stack | |
| 2647 | |
| 2648 bool _collecting_heap_roots; // are we collecting roots | |
| 2649 bool _following_object_refs; // are we following object references | |
| 2650 | |
| 2651 bool _reporting_primitive_fields; // optional reporting | |
| 2652 bool _reporting_primitive_array_values; | |
| 2653 bool _reporting_string_values; | |
| 2654 | |
| 2655 GrowableArray<oop>* create_visit_stack() { | |
| 6197 | 2656 return new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(initial_visit_stack_size, true); |
| 0 | 2657 } |
| 2658 | |
| 2659 // accessors | |
| 2660 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
| 2661 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 2662 Handle initial_object() const { return _initial_object; } | |
| 2663 | |
| 2664 bool is_following_references() const { return _following_object_refs; } | |
| 2665 | |
| 2666 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
| 2667 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
| 2668 bool is_reporting_string_values() const { return _reporting_string_values; } | |
| 2669 | |
| 2670 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
| 2671 | |
| 2672 // iterate over the various object types | |
| 2673 inline bool iterate_over_array(oop o); | |
| 2674 inline bool iterate_over_type_array(oop o); | |
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2675 inline bool iterate_over_class(oop o); |
| 0 | 2676 inline bool iterate_over_object(oop o); |
| 2677 | |
| 2678 // root collection | |
| 2679 inline bool collect_simple_roots(); | |
| 2680 inline bool collect_stack_roots(); | |
| 2681 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
| 2682 | |
| 2683 // visit an object | |
| 2684 inline bool visit(oop o); | |
| 2685 | |
| 2686 public: | |
| 2687 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2688 Handle initial_object, | |
| 2689 BasicHeapWalkContext callbacks, | |
| 2690 const void* user_data); | |
| 2691 | |
| 2692 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2693 Handle initial_object, | |
| 2694 AdvancedHeapWalkContext callbacks, | |
| 2695 const void* user_data); | |
| 2696 | |
| 2697 ~VM_HeapWalkOperation(); | |
| 2698 | |
| 2699 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
| 2700 void doit(); | |
| 2701 }; | |
| 2702 | |
| 2703 | |
| 2704 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2705 Handle initial_object, | |
| 2706 BasicHeapWalkContext callbacks, | |
| 2707 const void* user_data) { | |
| 2708 _is_advanced_heap_walk = false; | |
| 2709 _tag_map = tag_map; | |
| 2710 _initial_object = initial_object; | |
| 2711 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
| 2712 _reporting_primitive_fields = false; | |
| 2713 _reporting_primitive_array_values = false; | |
| 2714 _reporting_string_values = false; | |
| 2715 _visit_stack = create_visit_stack(); | |
| 2716 | |
| 2717 | |
| 2718 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
| 2719 } | |
| 2720 | |
| 2721 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2722 Handle initial_object, | |
| 2723 AdvancedHeapWalkContext callbacks, | |
| 2724 const void* user_data) { | |
| 2725 _is_advanced_heap_walk = true; | |
| 2726 _tag_map = tag_map; | |
| 2727 _initial_object = initial_object; | |
| 2728 _following_object_refs = true; | |
| 2729 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
| 2730 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
| 2731 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
| 2732 _visit_stack = create_visit_stack(); | |
| 2733 | |
| 2734 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
| 2735 } | |
| 2736 | |
| 2737 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
| 2738 if (_following_object_refs) { | |
| 2739 assert(_visit_stack != NULL, "checking"); | |
| 2740 delete _visit_stack; | |
| 2741 _visit_stack = NULL; | |
| 2742 } | |
| 2743 } | |
| 2744 | |
| 2745 // an array references its class and has a reference to | |
| 2746 // each element in the array | |
| 2747 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
| 2748 objArrayOop array = objArrayOop(o); | |
| 2749 | |
| 2750 // array reference to its class | |
| 2751 oop mirror = objArrayKlass::cast(array->klass())->java_mirror(); | |
| 2752 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
| 2753 return false; | |
| 2754 } | |
| 2755 | |
| 2756 // iterate over the array and report each reference to a | |
| 2757 // non-null element | |
| 2758 for (int index=0; index<array->length(); index++) { | |
| 2759 oop elem = array->obj_at(index); | |
| 2760 if (elem == NULL) { | |
| 2761 continue; | |
| 2762 } | |
| 2763 | |
| 2764 // report the array reference o[index] = elem | |
| 2765 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
| 2766 return false; | |
| 2767 } | |
| 2768 } | |
| 2769 return true; | |
| 2770 } | |
| 2771 | |
| 2772 // a type array references its class | |
| 2773 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
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2774 Klass* k = o->klass(); |
| 0 | 2775 oop mirror = Klass::cast(k)->java_mirror(); |
| 2776 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
| 2777 return false; | |
| 2778 } | |
| 2779 | |
| 2780 // report the array contents if required | |
| 2781 if (is_reporting_primitive_array_values()) { | |
| 2782 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
| 2783 return false; | |
| 2784 } | |
| 2785 } | |
| 2786 return true; | |
| 2787 } | |
| 2788 | |
| 2789 // verify that a static oop field is in range | |
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2790 static inline bool verify_static_oop(InstanceKlass* ik, |
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2791 oop mirror, int offset) { |
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2792 address obj_p = (address)mirror + offset; |
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2793 address start = (address)instanceMirrorKlass::start_of_static_fields(mirror); |
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2794 address end = start + (java_lang_Class::static_oop_field_count(mirror) * heapOopSize); |
| 0 | 2795 assert(end >= start, "sanity check"); |
| 2796 | |
| 2797 if (obj_p >= start && obj_p < end) { | |
| 2798 return true; | |
| 2799 } else { | |
| 2800 return false; | |
| 2801 } | |
| 2802 } | |
| 2803 | |
| 2804 // a class references its super class, interfaces, class loader, ... | |
| 2805 // and finally its static fields | |
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2806 inline bool VM_HeapWalkOperation::iterate_over_class(oop java_class) { |
| 0 | 2807 int i; |
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2808 Klass* klass = java_lang_Class::as_Klass(java_class); |
| 0 | 2809 |
| 2810 if (klass->oop_is_instance()) { | |
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2811 InstanceKlass* ik = InstanceKlass::cast(klass); |
| 0 | 2812 |
| 2813 // ignore the class if it's has been initialized yet | |
| 2814 if (!ik->is_linked()) { | |
| 2815 return true; | |
| 2816 } | |
| 2817 | |
| 2818 // get the java mirror | |
| 2819 oop mirror = klass->java_mirror(); | |
| 2820 | |
| 2821 // super (only if something more interesting than java.lang.Object) | |
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2822 Klass* java_super = ik->java_super(); |
| 1142 | 2823 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
| 0 | 2824 oop super = Klass::cast(java_super)->java_mirror(); |
| 2825 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { | |
| 2826 return false; | |
| 2827 } | |
| 2828 } | |
| 2829 | |
| 2830 // class loader | |
| 2831 oop cl = ik->class_loader(); | |
| 2832 if (cl != NULL) { | |
| 2833 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
| 2834 return false; | |
| 2835 } | |
| 2836 } | |
| 2837 | |
| 2838 // protection domain | |
| 2839 oop pd = ik->protection_domain(); | |
| 2840 if (pd != NULL) { | |
| 2841 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
| 2842 return false; | |
| 2843 } | |
| 2844 } | |
| 2845 | |
| 2846 // signers | |
| 2847 oop signers = ik->signers(); | |
| 2848 if (signers != NULL) { | |
| 2849 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
| 2850 return false; | |
| 2851 } | |
| 2852 } | |
| 2853 | |
| 2854 // references from the constant pool | |
| 2855 { | |
|
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2856 ConstantPool* const pool = ik->constants(); |
| 0 | 2857 for (int i = 1; i < pool->length(); i++) { |
| 2858 constantTag tag = pool->tag_at(i).value(); | |
| 2859 if (tag.is_string() || tag.is_klass()) { | |
| 2860 oop entry; | |
| 2861 if (tag.is_string()) { | |
| 2862 entry = pool->resolved_string_at(i); | |
|
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2863 // If the entry is non-null it it resolved. |
|
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|
2864 if (entry == NULL) continue; |
| 0 | 2865 assert(java_lang_String::is_instance(entry), "must be string"); |
| 2866 } else { | |
| 2867 entry = Klass::cast(pool->resolved_klass_at(i))->java_mirror(); | |
| 2868 } | |
| 2869 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
| 2870 return false; | |
| 2871 } | |
| 2872 } | |
| 2873 } | |
| 2874 } | |
| 2875 | |
| 2876 // interfaces | |
| 2877 // (These will already have been reported as references from the constant pool | |
| 2878 // but are specified by IterateOverReachableObjects and must be reported). | |
|
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2879 Array<Klass*>* interfaces = ik->local_interfaces(); |
| 0 | 2880 for (i = 0; i < interfaces->length(); i++) { |
|
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2881 oop interf = Klass::cast((Klass*)interfaces->at(i))->java_mirror(); |
| 0 | 2882 if (interf == NULL) { |
| 2883 continue; | |
| 2884 } | |
| 2885 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
| 2886 return false; | |
| 2887 } | |
| 2888 } | |
| 2889 | |
| 2890 // iterate over the static fields | |
| 2891 | |
|
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2892 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
| 0 | 2893 for (i=0; i<field_map->field_count(); i++) { |
| 2894 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 2895 char type = field->field_type(); | |
| 2896 if (!is_primitive_field_type(type)) { | |
|
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2897 oop fld_o = mirror->obj_field(field->field_offset()); |
|
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|
2898 assert(verify_static_oop(ik, mirror, field->field_offset()), "sanity check"); |
| 0 | 2899 if (fld_o != NULL) { |
| 2900 int slot = field->field_index(); | |
| 2901 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
| 2902 delete field_map; | |
| 2903 return false; | |
| 2904 } | |
| 2905 } | |
| 2906 } else { | |
| 2907 if (is_reporting_primitive_fields()) { | |
|
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|
2908 address addr = (address)mirror + field->field_offset(); |
| 0 | 2909 int slot = field->field_index(); |
| 2910 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
| 2911 delete field_map; | |
| 2912 return false; | |
| 2913 } | |
| 2914 } | |
| 2915 } | |
| 2916 } | |
| 2917 delete field_map; | |
| 2918 | |
| 2919 return true; | |
| 2920 } | |
| 2921 | |
| 2922 return true; | |
| 2923 } | |
| 2924 | |
| 2925 // an object references a class and its instance fields | |
| 2926 // (static fields are ignored here as we report these as | |
| 2927 // references from the class). | |
| 2928 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
| 2929 // reference to the class | |
| 2930 if (!CallbackInvoker::report_class_reference(o, Klass::cast(o->klass())->java_mirror())) { | |
| 2931 return false; | |
| 2932 } | |
| 2933 | |
| 2934 // iterate over instance fields | |
| 2935 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
| 2936 for (int i=0; i<field_map->field_count(); i++) { | |
| 2937 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 2938 char type = field->field_type(); | |
| 2939 if (!is_primitive_field_type(type)) { | |
|
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2940 oop fld_o = o->obj_field(field->field_offset()); |
|
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2941 // ignore any objects that aren't visible to profiler |
|
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|
2942 if (fld_o != NULL && ServiceUtil::visible_oop(fld_o)) { |
|
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2943 assert(Universe::heap()->is_in_reserved(fld_o), "unsafe code should not " |
|
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|
2944 "have references to Klass* anymore"); |
| 0 | 2945 int slot = field->field_index(); |
| 2946 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
| 2947 return false; | |
| 2948 } | |
| 2949 } | |
| 2950 } else { | |
| 2951 if (is_reporting_primitive_fields()) { | |
| 2952 // primitive instance field | |
| 2953 address addr = (address)o + field->field_offset(); | |
| 2954 int slot = field->field_index(); | |
| 2955 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
| 2956 return false; | |
| 2957 } | |
| 2958 } | |
| 2959 } | |
| 2960 } | |
| 2961 | |
| 2962 // if the object is a java.lang.String | |
| 2963 if (is_reporting_string_values() && | |
| 1142 | 2964 o->klass() == SystemDictionary::String_klass()) { |
| 0 | 2965 if (!CallbackInvoker::report_string_value(o)) { |
| 2966 return false; | |
| 2967 } | |
| 2968 } | |
| 2969 return true; | |
| 2970 } | |
| 2971 | |
| 2972 | |
|
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|
2973 // Collects all simple (non-stack) roots except for threads; |
|
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|
2974 // threads are handled in collect_stack_roots() as an optimization. |
| 0 | 2975 // if there's a heap root callback provided then the callback is |
| 2976 // invoked for each simple root. | |
| 2977 // if an object reference callback is provided then all simple | |
| 2978 // roots are pushed onto the marking stack so that they can be | |
| 2979 // processed later | |
| 2980 // | |
| 2981 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
| 2982 SimpleRootsClosure blk; | |
| 2983 | |
| 2984 // JNI globals | |
| 2985 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
| 2986 JNIHandles::oops_do(&blk); | |
| 2987 if (blk.stopped()) { | |
| 2988 return false; | |
| 2989 } | |
| 2990 | |
| 2991 // Preloaded classes and loader from the system dictionary | |
| 2992 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
| 2993 SystemDictionary::always_strong_oops_do(&blk); | |
|
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2994 ClassLoaderDataGraph::always_strong_oops_do(&blk, NULL, false); |
| 0 | 2995 if (blk.stopped()) { |
| 2996 return false; | |
| 2997 } | |
| 2998 | |
| 2999 // Inflated monitors | |
| 3000 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
| 3001 ObjectSynchronizer::oops_do(&blk); | |
| 3002 if (blk.stopped()) { | |
| 3003 return false; | |
| 3004 } | |
| 3005 | |
|
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|
3006 // threads are now handled in collect_stack_roots() |
| 0 | 3007 |
| 3008 // Other kinds of roots maintained by HotSpot | |
| 3009 // Many of these won't be visible but others (such as instances of important | |
| 3010 // exceptions) will be visible. | |
| 3011 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
| 3012 Universe::oops_do(&blk); | |
|
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|
3013 |
|
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|
3014 // If there are any non-perm roots in the code cache, visit them. |
|
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|
3015 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
|
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|
3016 CodeBlobToOopClosure look_in_blobs(&blk, false); |
|
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|
3017 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
|
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|
3018 |
| 0 | 3019 return true; |
| 3020 } | |
| 3021 | |
| 3022 // Walk the stack of a given thread and find all references (locals | |
| 3023 // and JNI calls) and report these as stack references | |
| 3024 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
| 3025 JNILocalRootsClosure* blk) | |
| 3026 { | |
| 3027 oop threadObj = java_thread->threadObj(); | |
| 3028 assert(threadObj != NULL, "sanity check"); | |
| 3029 | |
| 3030 // only need to get the thread's tag once per thread | |
| 3031 jlong thread_tag = tag_for(_tag_map, threadObj); | |
| 3032 | |
| 3033 // also need the thread id | |
| 3034 jlong tid = java_lang_Thread::thread_id(threadObj); | |
| 3035 | |
| 3036 | |
| 3037 if (java_thread->has_last_Java_frame()) { | |
| 3038 | |
| 3039 // vframes are resource allocated | |
| 3040 Thread* current_thread = Thread::current(); | |
| 3041 ResourceMark rm(current_thread); | |
| 3042 HandleMark hm(current_thread); | |
| 3043 | |
| 3044 RegisterMap reg_map(java_thread); | |
| 3045 frame f = java_thread->last_frame(); | |
| 3046 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
| 3047 | |
| 3048 bool is_top_frame = true; | |
| 3049 int depth = 0; | |
| 3050 frame* last_entry_frame = NULL; | |
| 3051 | |
| 3052 while (vf != NULL) { | |
| 3053 if (vf->is_java_frame()) { | |
| 3054 | |
| 3055 // java frame (interpreted, compiled, ...) | |
| 3056 javaVFrame *jvf = javaVFrame::cast(vf); | |
| 3057 | |
| 3058 // the jmethodID | |
| 3059 jmethodID method = jvf->method()->jmethod_id(); | |
| 3060 | |
| 3061 if (!(jvf->method()->is_native())) { | |
| 3062 jlocation bci = (jlocation)jvf->bci(); | |
| 3063 StackValueCollection* locals = jvf->locals(); | |
| 3064 for (int slot=0; slot<locals->size(); slot++) { | |
| 3065 if (locals->at(slot)->type() == T_OBJECT) { | |
| 3066 oop o = locals->obj_at(slot)(); | |
| 3067 if (o == NULL) { | |
| 3068 continue; | |
| 3069 } | |
| 3070 | |
| 3071 // stack reference | |
| 3072 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
| 3073 bci, slot, o)) { | |
| 3074 return false; | |
| 3075 } | |
| 3076 } | |
| 3077 } | |
| 3078 } else { | |
| 3079 blk->set_context(thread_tag, tid, depth, method); | |
| 3080 if (is_top_frame) { | |
| 3081 // JNI locals for the top frame. | |
| 3082 java_thread->active_handles()->oops_do(blk); | |
| 3083 } else { | |
| 3084 if (last_entry_frame != NULL) { | |
| 3085 // JNI locals for the entry frame | |
| 3086 assert(last_entry_frame->is_entry_frame(), "checking"); | |
| 3087 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
| 3088 } | |
| 3089 } | |
| 3090 } | |
| 3091 last_entry_frame = NULL; | |
| 3092 depth++; | |
| 3093 } else { | |
| 3094 // externalVFrame - for an entry frame then we report the JNI locals | |
| 3095 // when we find the corresponding javaVFrame | |
| 3096 frame* fr = vf->frame_pointer(); | |
| 3097 assert(fr != NULL, "sanity check"); | |
| 3098 if (fr->is_entry_frame()) { | |
| 3099 last_entry_frame = fr; | |
| 3100 } | |
| 3101 } | |
| 3102 | |
| 3103 vf = vf->sender(); | |
| 3104 is_top_frame = false; | |
| 3105 } | |
| 3106 } else { | |
| 3107 // no last java frame but there may be JNI locals | |
| 3108 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
| 3109 java_thread->active_handles()->oops_do(blk); | |
| 3110 } | |
| 3111 return true; | |
| 3112 } | |
| 3113 | |
| 3114 | |
|
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3115 // Collects the simple roots for all threads and collects all |
|
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|
3116 // stack roots - for each thread it walks the execution |
| 0 | 3117 // stack to find all references and local JNI refs. |
| 3118 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
| 3119 JNILocalRootsClosure blk; | |
| 3120 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
| 3121 oop threadObj = thread->threadObj(); | |
| 3122 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
|
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|
3123 // Collect the simple root for this thread before we |
|
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|
3124 // collect its stack roots |
|
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|
3125 if (!CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, |
|
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|
3126 threadObj)) { |
|
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|
3127 return false; |
|
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|
3128 } |
| 0 | 3129 if (!collect_stack_roots(thread, &blk)) { |
| 3130 return false; | |
| 3131 } | |
| 3132 } | |
| 3133 } | |
| 3134 return true; | |
| 3135 } | |
| 3136 | |
| 3137 // visit an object | |
| 3138 // first mark the object as visited | |
| 3139 // second get all the outbound references from this object (in other words, all | |
| 3140 // the objects referenced by this object). | |
| 3141 // | |
| 3142 bool VM_HeapWalkOperation::visit(oop o) { | |
| 3143 // mark object as visited | |
| 3144 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
| 3145 ObjectMarker::mark(o); | |
| 3146 | |
| 3147 // instance | |
| 3148 if (o->is_instance()) { | |
| 1142 | 3149 if (o->klass() == SystemDictionary::Class_klass()) { |
|
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3150 if (!java_lang_Class::is_primitive(o)) { |
| 0 | 3151 // a java.lang.Class |
|
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3152 return iterate_over_class(o); |
| 0 | 3153 } |
| 3154 } else { | |
| 3155 return iterate_over_object(o); | |
| 3156 } | |
| 3157 } | |
| 3158 | |
| 3159 // object array | |
| 3160 if (o->is_objArray()) { | |
| 3161 return iterate_over_array(o); | |
| 3162 } | |
| 3163 | |
| 3164 // type array | |
| 3165 if (o->is_typeArray()) { | |
| 3166 return iterate_over_type_array(o); | |
| 3167 } | |
| 3168 | |
| 3169 return true; | |
| 3170 } | |
| 3171 | |
| 3172 void VM_HeapWalkOperation::doit() { | |
| 3173 ResourceMark rm; | |
| 3174 ObjectMarkerController marker; | |
| 3175 ClassFieldMapCacheMark cm; | |
| 3176 | |
| 3177 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
| 3178 | |
| 3179 // the heap walk starts with an initial object or the heap roots | |
| 3180 if (initial_object().is_null()) { | |
| 3815 | 3181 // If either collect_stack_roots() or collect_simple_roots() |
| 3182 // returns false at this point, then there are no mark bits | |
| 3183 // to reset. | |
| 3184 ObjectMarker::set_needs_reset(false); | |
| 3185 | |
|
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3186 // Calling collect_stack_roots() before collect_simple_roots() |
|
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|
3187 // can result in a big performance boost for an agent that is |
|
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|
3188 // focused on analyzing references in the thread stacks. |
|
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|
3189 if (!collect_stack_roots()) return; |
|
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|
3190 |
| 0 | 3191 if (!collect_simple_roots()) return; |
| 3815 | 3192 |
| 3193 // no early return so enable heap traversal to reset the mark bits | |
| 3194 ObjectMarker::set_needs_reset(true); | |
| 0 | 3195 } else { |
| 3196 visit_stack()->push(initial_object()()); | |
| 3197 } | |
| 3198 | |
| 3199 // object references required | |
| 3200 if (is_following_references()) { | |
| 3201 | |
| 3202 // visit each object until all reachable objects have been | |
| 3203 // visited or the callback asked to terminate the iteration. | |
| 3204 while (!visit_stack()->is_empty()) { | |
| 3205 oop o = visit_stack()->pop(); | |
| 3206 if (!ObjectMarker::visited(o)) { | |
| 3207 if (!visit(o)) { | |
| 3208 break; | |
| 3209 } | |
| 3210 } | |
| 3211 } | |
| 3212 } | |
| 3213 } | |
| 3214 | |
| 3215 // iterate over all objects that are reachable from a set of roots | |
| 3216 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
| 3217 jvmtiStackReferenceCallback stack_ref_callback, | |
| 3218 jvmtiObjectReferenceCallback object_ref_callback, | |
| 3219 const void* user_data) { | |
| 3220 MutexLocker ml(Heap_lock); | |
| 3221 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
| 3222 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
| 3223 VMThread::execute(&op); | |
| 3224 } | |
| 3225 | |
| 3226 // iterate over all objects that are reachable from a given object | |
| 3227 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
| 3228 jvmtiObjectReferenceCallback object_ref_callback, | |
| 3229 const void* user_data) { | |
| 3230 oop obj = JNIHandles::resolve(object); | |
| 3231 Handle initial_object(Thread::current(), obj); | |
| 3232 | |
| 3233 MutexLocker ml(Heap_lock); | |
| 3234 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
| 3235 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
| 3236 VMThread::execute(&op); | |
| 3237 } | |
| 3238 | |
| 3239 // follow references from an initial object or the GC roots | |
| 3240 void JvmtiTagMap::follow_references(jint heap_filter, | |
| 3241 KlassHandle klass, | |
| 3242 jobject object, | |
| 3243 const jvmtiHeapCallbacks* callbacks, | |
| 3244 const void* user_data) | |
| 3245 { | |
| 3246 oop obj = JNIHandles::resolve(object); | |
| 3247 Handle initial_object(Thread::current(), obj); | |
| 3248 | |
| 3249 MutexLocker ml(Heap_lock); | |
| 3250 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
| 3251 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
| 3252 VMThread::execute(&op); | |
| 3253 } | |
| 3254 | |
| 3255 | |
|
2125
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diff
changeset
|
3256 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
|
3257 // 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
|
3258 // 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
|
3259 // 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
|
3260 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
|
3261 SafepointSynchronize::is_at_safepoint(), |
|
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3262 "must be executed at a safepoint"); |
| 0 | 3263 if (JvmtiEnv::environments_might_exist()) { |
| 3264 JvmtiEnvIterator it; | |
| 3265 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
| 3266 JvmtiTagMap* tag_map = env->tag_map(); | |
| 3267 if (tag_map != NULL && !tag_map->is_empty()) { | |
|
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
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diff
changeset
|
3268 tag_map->do_weak_oops(is_alive, f); |
| 0 | 3269 } |
| 3270 } | |
| 3271 } | |
| 3272 } | |
| 3273 | |
|
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3274 void JvmtiTagMap::do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f) { |
| 0 | 3275 |
| 3276 // does this environment have the OBJECT_FREE event enabled | |
| 3277 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
| 3278 | |
| 3279 // counters used for trace message | |
| 3280 int freed = 0; | |
| 3281 int moved = 0; | |
|
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3282 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3283 JvmtiTagHashmap* hashmap = this->hashmap(); |
| 0 | 3284 |
| 3285 // reenable sizing (if disabled) | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3286 hashmap->set_resizing_enabled(true); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3287 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3288 // 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
|
3289 if (hashmap->_entry_count == 0) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3290 return; |
| 0 | 3291 } |
| 3292 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3293 // now iterate through each entry in the table |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3294 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3295 JvmtiTagHashmapEntry** table = hashmap->table(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3296 int size = hashmap->size(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3297 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3298 JvmtiTagHashmapEntry* delayed_add = NULL; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3299 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3300 for (int pos = 0; pos < size; ++pos) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3301 JvmtiTagHashmapEntry* entry = table[pos]; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3302 JvmtiTagHashmapEntry* prev = NULL; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3303 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3304 while (entry != NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3305 JvmtiTagHashmapEntry* next = entry->next(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3306 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3307 oop* obj = entry->object_addr(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3308 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3309 // has object been GC'ed |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3310 if (!is_alive->do_object_b(entry->object())) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3311 // grab the tag |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3312 jlong tag = entry->tag(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3313 guarantee(tag != 0, "checking"); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3314 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3315 // remove GC'ed entry from hashmap and return the |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3316 // entry to the free list |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3317 hashmap->remove(prev, pos, entry); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3318 destroy_entry(entry); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3319 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3320 // post the event to the profiler |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3321 if (post_object_free) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3322 JvmtiExport::post_object_free(env(), tag); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3323 } |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3324 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3325 ++freed; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3326 } else { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3327 f->do_oop(entry->object_addr()); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3328 oop new_oop = entry->object(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3329 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3330 // 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
|
3331 // entry to its new location. |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3332 unsigned int new_pos = JvmtiTagHashmap::hash(new_oop, size); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3333 if (new_pos != (unsigned int)pos) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3334 if (prev == NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3335 table[pos] = next; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3336 } else { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3337 prev->set_next(next); |
| 0 | 3338 } |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3339 if (new_pos < (unsigned int)pos) { |
| 0 | 3340 entry->set_next(table[new_pos]); |
| 3341 table[new_pos] = entry; | |
| 3342 } else { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3343 // 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
|
3344 // hitting it again during this iteration. |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3345 entry->set_next(delayed_add); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3346 delayed_add = entry; |
| 0 | 3347 } |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3348 moved++; |
| 0 | 3349 } else { |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3350 // object didn't move |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3351 prev = entry; |
| 0 | 3352 } |
| 3353 } | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3354 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3355 entry = next; |
| 0 | 3356 } |
| 3357 } | |
| 3358 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3359 // Re-add all the entries which were kept aside |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3360 while (delayed_add != NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3361 JvmtiTagHashmapEntry* next = delayed_add->next(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3362 unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3363 delayed_add->set_next(table[pos]); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3364 table[pos] = delayed_add; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3365 delayed_add = next; |
| 0 | 3366 } |
| 3367 | |
| 3368 // stats | |
| 3369 if (TraceJVMTIObjectTagging) { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3370 int post_total = hashmap->_entry_count; |
| 0 | 3371 int pre_total = post_total + freed; |
| 3372 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3373 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
|
3374 pre_total, post_total, freed, moved); |
| 0 | 3375 } |
| 3376 } |