Mercurial > hg > graal-jvmci-8
annotate src/share/vm/prims/jvmtiTagMap.cpp @ 6197:d2a62e0f25eb
6995781: Native Memory Tracking (Phase 1)
7151532: DCmd for hotspot native memory tracking
Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd
Reviewed-by: acorn, coleenp, fparain
| author | zgu |
|---|---|
| date | Thu, 28 Jun 2012 17:03:16 -0400 |
| parents | 588f559105c1 |
| children | 1d7922586cf6 |
| 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 // If the object is a java.lang.Class then return the klassOop, | |
| 537 // otherwise return the original object | |
| 538 static inline oop klassOop_if_java_lang_Class(oop o) { | |
| 1142 | 539 if (o->klass() == SystemDictionary::Class_klass()) { |
| 0 | 540 if (!java_lang_Class::is_primitive(o)) { |
| 541 o = (oop)java_lang_Class::as_klassOop(o); | |
| 542 assert(o != NULL, "class for non-primitive mirror must exist"); | |
| 543 } | |
| 544 } | |
| 545 return o; | |
| 546 } | |
| 547 | |
| 548 // A CallbackWrapper is a support class for querying and tagging an object | |
| 549 // around a callback to a profiler. The constructor does pre-callback | |
| 550 // work to get the tag value, klass tag value, ... and the destructor | |
| 551 // does the post-callback work of tagging or untagging the object. | |
| 552 // | |
| 553 // { | |
| 554 // CallbackWrapper wrapper(tag_map, o); | |
| 555 // | |
| 556 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
| 557 // | |
| 558 // } // wrapper goes out of scope here which results in the destructor | |
| 559 // checking to see if the object has been tagged, untagged, or the | |
| 560 // tag value has changed. | |
| 561 // | |
| 562 class CallbackWrapper : public StackObj { | |
| 563 private: | |
| 564 JvmtiTagMap* _tag_map; | |
| 565 JvmtiTagHashmap* _hashmap; | |
| 566 JvmtiTagHashmapEntry* _entry; | |
| 567 oop _o; | |
| 568 jlong _obj_size; | |
| 569 jlong _obj_tag; | |
| 570 klassOop _klass; // the object's class | |
| 571 jlong _klass_tag; | |
| 572 | |
| 573 protected: | |
| 574 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 575 | |
| 576 // invoked post-callback to tag, untag, or update the tag of an object | |
| 577 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
| 578 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
| 579 public: | |
| 580 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
| 581 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
| 582 "MT unsafe or must be VM thread"); | |
| 583 | |
| 584 // for Classes the klassOop is tagged | |
| 585 _o = klassOop_if_java_lang_Class(o); | |
| 586 | |
| 587 // object size | |
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588 _obj_size = (jlong)_o->size() * wordSize; |
| 0 | 589 |
| 590 // record the context | |
| 591 _tag_map = tag_map; | |
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592 _hashmap = tag_map->hashmap(); |
| 0 | 593 _entry = _hashmap->find(_o); |
| 594 | |
| 595 // get object tag | |
| 596 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
| 597 | |
| 598 // get the class and the class's tag value | |
| 599 if (_o == o) { | |
| 600 _klass = _o->klass(); | |
| 601 } else { | |
| 602 // if the object represents a runtime class then use the | |
| 603 // tag for java.lang.Class | |
| 1142 | 604 _klass = SystemDictionary::Class_klass(); |
| 0 | 605 } |
| 606 _klass_tag = tag_for(tag_map, _klass); | |
| 607 } | |
| 608 | |
| 609 ~CallbackWrapper() { | |
| 610 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
| 611 } | |
| 612 | |
| 613 inline jlong* obj_tag_p() { return &_obj_tag; } | |
| 614 inline jlong obj_size() const { return _obj_size; } | |
| 615 inline jlong obj_tag() const { return _obj_tag; } | |
| 616 inline klassOop klass() const { return _klass; } | |
| 617 inline jlong klass_tag() const { return _klass_tag; } | |
| 618 }; | |
| 619 | |
| 620 | |
| 621 | |
| 622 // callback post-callback to tag, untag, or update the tag of an object | |
| 623 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
| 624 JvmtiTagHashmap* hashmap, | |
| 625 JvmtiTagHashmapEntry* entry, | |
| 626 jlong obj_tag) { | |
| 627 if (entry == NULL) { | |
| 628 if (obj_tag != 0) { | |
| 629 // callback has tagged the object | |
| 630 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
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631 entry = tag_map()->create_entry(o, obj_tag); |
| 0 | 632 hashmap->add(o, entry); |
| 633 } | |
| 634 } else { | |
| 635 // object was previously tagged - the callback may have untagged | |
| 636 // the object or changed the tag value | |
| 637 if (obj_tag == 0) { | |
| 638 | |
| 639 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
| 640 assert(entry_removed == entry, "checking"); | |
| 641 tag_map()->destroy_entry(entry); | |
| 642 | |
| 643 } else { | |
| 644 if (obj_tag != entry->tag()) { | |
| 645 entry->set_tag(obj_tag); | |
| 646 } | |
| 647 } | |
| 648 } | |
| 649 } | |
| 650 | |
| 651 // An extended CallbackWrapper used when reporting an object reference | |
| 652 // to the agent. | |
| 653 // | |
| 654 // { | |
| 655 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
| 656 // | |
| 657 // (*callback)(wrapper.klass_tag(), | |
| 658 // wrapper.obj_size(), | |
| 659 // wrapper.obj_tag_p() | |
| 660 // wrapper.referrer_tag_p(), ...) | |
| 661 // | |
| 662 // } // wrapper goes out of scope here which results in the destructor | |
| 663 // checking to see if the referrer object has been tagged, untagged, | |
| 664 // or the tag value has changed. | |
| 665 // | |
| 666 class TwoOopCallbackWrapper : public CallbackWrapper { | |
| 667 private: | |
| 668 bool _is_reference_to_self; | |
| 669 JvmtiTagHashmap* _referrer_hashmap; | |
| 670 JvmtiTagHashmapEntry* _referrer_entry; | |
| 671 oop _referrer; | |
| 672 jlong _referrer_obj_tag; | |
| 673 jlong _referrer_klass_tag; | |
| 674 jlong* _referrer_tag_p; | |
| 675 | |
| 676 bool is_reference_to_self() const { return _is_reference_to_self; } | |
| 677 | |
| 678 public: | |
| 679 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
| 680 CallbackWrapper(tag_map, o) | |
| 681 { | |
| 682 // self reference needs to be handled in a special way | |
| 683 _is_reference_to_self = (referrer == o); | |
| 684 | |
| 685 if (_is_reference_to_self) { | |
| 686 _referrer_klass_tag = klass_tag(); | |
| 687 _referrer_tag_p = obj_tag_p(); | |
| 688 } else { | |
| 689 // for Classes the klassOop is tagged | |
| 690 _referrer = klassOop_if_java_lang_Class(referrer); | |
| 691 // record the context | |
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692 _referrer_hashmap = tag_map->hashmap(); |
| 0 | 693 _referrer_entry = _referrer_hashmap->find(_referrer); |
| 694 | |
| 695 // get object tag | |
| 696 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
| 697 _referrer_tag_p = &_referrer_obj_tag; | |
| 698 | |
| 699 // get referrer class tag. | |
| 700 klassOop k = (_referrer == referrer) ? // Check if referrer is a class... | |
| 701 _referrer->klass() // No, just get its class | |
| 1142 | 702 : SystemDictionary::Class_klass(); // Yes, its class is Class |
| 0 | 703 _referrer_klass_tag = tag_for(tag_map, k); |
| 704 } | |
| 705 } | |
| 706 | |
| 707 ~TwoOopCallbackWrapper() { | |
| 708 if (!is_reference_to_self()){ | |
| 709 post_callback_tag_update(_referrer, | |
| 710 _referrer_hashmap, | |
| 711 _referrer_entry, | |
| 712 _referrer_obj_tag); | |
| 713 } | |
| 714 } | |
| 715 | |
| 716 // address of referrer tag | |
| 717 // (for a self reference this will return the same thing as obj_tag_p()) | |
| 718 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
| 719 | |
| 720 // referrer's class tag | |
| 721 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
| 722 }; | |
| 723 | |
| 724 // tag an object | |
| 725 // | |
| 726 // This function is performance critical. If many threads attempt to tag objects | |
| 727 // around the same time then it's possible that the Mutex associated with the | |
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728 // tag map will be a hot lock. |
| 0 | 729 void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
| 730 MutexLocker ml(lock()); | |
| 731 | |
| 732 // resolve the object | |
| 733 oop o = JNIHandles::resolve_non_null(object); | |
| 734 | |
| 735 // for Classes we tag the klassOop | |
| 736 o = klassOop_if_java_lang_Class(o); | |
| 737 | |
| 738 // see if the object is already tagged | |
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739 JvmtiTagHashmap* hashmap = _hashmap; |
| 0 | 740 JvmtiTagHashmapEntry* entry = hashmap->find(o); |
| 741 | |
| 742 // if the object is not already tagged then we tag it | |
| 743 if (entry == NULL) { | |
| 744 if (tag != 0) { | |
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745 entry = create_entry(o, tag); |
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746 hashmap->add(o, entry); |
| 0 | 747 } else { |
| 748 // no-op | |
| 749 } | |
| 750 } else { | |
| 751 // if the object is already tagged then we either update | |
| 752 // the tag (if a new tag value has been provided) | |
| 753 // or remove the object if the new tag value is 0. | |
| 754 if (tag == 0) { | |
| 755 hashmap->remove(o); | |
| 756 destroy_entry(entry); | |
| 757 } else { | |
| 758 entry->set_tag(tag); | |
| 759 } | |
| 760 } | |
| 761 } | |
| 762 | |
| 763 // get the tag for an object | |
| 764 jlong JvmtiTagMap::get_tag(jobject object) { | |
| 765 MutexLocker ml(lock()); | |
| 766 | |
| 767 // resolve the object | |
| 768 oop o = JNIHandles::resolve_non_null(object); | |
| 769 | |
| 770 // for Classes get the tag from the klassOop | |
| 771 return tag_for(this, klassOop_if_java_lang_Class(o)); | |
| 772 } | |
| 773 | |
| 774 | |
| 775 // Helper class used to describe the static or instance fields of a class. | |
| 776 // For each field it holds the field index (as defined by the JVMTI specification), | |
| 777 // the field type, and the offset. | |
| 778 | |
| 6197 | 779 class ClassFieldDescriptor: public CHeapObj<mtInternal> { |
| 0 | 780 private: |
| 781 int _field_index; | |
| 782 int _field_offset; | |
| 783 char _field_type; | |
| 784 public: | |
| 785 ClassFieldDescriptor(int index, char type, int offset) : | |
| 786 _field_index(index), _field_type(type), _field_offset(offset) { | |
| 787 } | |
| 788 int field_index() const { return _field_index; } | |
| 789 char field_type() const { return _field_type; } | |
| 790 int field_offset() const { return _field_offset; } | |
| 791 }; | |
| 792 | |
| 6197 | 793 class ClassFieldMap: public CHeapObj<mtInternal> { |
| 0 | 794 private: |
| 795 enum { | |
| 796 initial_field_count = 5 | |
| 797 }; | |
| 798 | |
| 799 // list of field descriptors | |
| 800 GrowableArray<ClassFieldDescriptor*>* _fields; | |
| 801 | |
| 802 // constructor | |
| 803 ClassFieldMap(); | |
| 804 | |
| 805 // add a field | |
| 806 void add(int index, char type, int offset); | |
| 807 | |
| 808 // returns the field count for the given class | |
| 809 static int compute_field_count(instanceKlassHandle ikh); | |
| 810 | |
| 811 public: | |
| 812 ~ClassFieldMap(); | |
| 813 | |
| 814 // access | |
| 815 int field_count() { return _fields->length(); } | |
| 816 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
| 817 | |
| 818 // functions to create maps of static or instance fields | |
| 819 static ClassFieldMap* create_map_of_static_fields(klassOop k); | |
| 820 static ClassFieldMap* create_map_of_instance_fields(oop obj); | |
| 821 }; | |
| 822 | |
| 823 ClassFieldMap::ClassFieldMap() { | |
| 6197 | 824 _fields = new (ResourceObj::C_HEAP, mtInternal) |
| 825 GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
| 0 | 826 } |
| 827 | |
| 828 ClassFieldMap::~ClassFieldMap() { | |
| 829 for (int i=0; i<_fields->length(); i++) { | |
| 830 delete _fields->at(i); | |
| 831 } | |
| 832 delete _fields; | |
| 833 } | |
| 834 | |
| 835 void ClassFieldMap::add(int index, char type, int offset) { | |
| 836 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
| 837 _fields->append(field); | |
| 838 } | |
| 839 | |
| 840 // Returns a heap allocated ClassFieldMap to describe the static fields | |
| 841 // of the given class. | |
| 842 // | |
| 843 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(klassOop k) { | |
| 844 HandleMark hm; | |
| 845 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
| 846 | |
| 847 // create the field map | |
| 848 ClassFieldMap* field_map = new ClassFieldMap(); | |
| 849 | |
| 850 FilteredFieldStream f(ikh, false, false); | |
| 851 int max_field_index = f.field_count()-1; | |
| 852 | |
| 853 int index = 0; | |
| 854 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
| 855 // ignore instance 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 return field_map; | |
| 862 } | |
| 863 | |
| 864 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
| 865 // of the given class. All instance fields are included (this means public | |
| 866 // and private fields declared in superclasses and superinterfaces too). | |
| 867 // | |
| 868 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
| 869 HandleMark hm; | |
| 870 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
| 871 | |
| 872 // create the field map | |
| 873 ClassFieldMap* field_map = new ClassFieldMap(); | |
| 874 | |
| 875 FilteredFieldStream f(ikh, false, false); | |
| 876 | |
| 877 int max_field_index = f.field_count()-1; | |
| 878 | |
| 879 int index = 0; | |
| 880 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
| 881 // ignore static fields | |
| 882 if (fld.access_flags().is_static()) { | |
| 883 continue; | |
| 884 } | |
| 885 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
| 886 } | |
| 887 | |
| 888 return field_map; | |
| 889 } | |
| 890 | |
| 891 // Helper class used to cache a ClassFileMap for the instance fields of | |
| 892 // a cache. A JvmtiCachedClassFieldMap can be cached by an instanceKlass during | |
| 893 // heap iteration and avoid creating a field map for each object in the heap | |
| 894 // (only need to create the map when the first instance of a class is encountered). | |
| 895 // | |
| 6197 | 896 class JvmtiCachedClassFieldMap : public CHeapObj<mtInternal> { |
| 0 | 897 private: |
| 898 enum { | |
| 899 initial_class_count = 200 | |
| 900 }; | |
| 901 ClassFieldMap* _field_map; | |
| 902 | |
| 903 ClassFieldMap* field_map() const { return _field_map; } | |
| 904 | |
| 905 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
| 906 ~JvmtiCachedClassFieldMap(); | |
| 907 | |
| 908 static GrowableArray<instanceKlass*>* _class_list; | |
| 909 static void add_to_class_list(instanceKlass* ik); | |
| 910 | |
| 911 public: | |
| 912 // returns the field map for a given object (returning map cached | |
| 913 // by instanceKlass if possible | |
| 914 static ClassFieldMap* get_map_of_instance_fields(oop obj); | |
| 915 | |
| 916 // removes the field map from all instanceKlasses - should be | |
| 917 // called before VM operation completes | |
| 918 static void clear_cache(); | |
| 919 | |
| 920 // returns the number of ClassFieldMap cached by instanceKlasses | |
| 921 static int cached_field_map_count(); | |
| 922 }; | |
| 923 | |
| 924 GrowableArray<instanceKlass*>* JvmtiCachedClassFieldMap::_class_list; | |
| 925 | |
| 926 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
| 927 _field_map = field_map; | |
| 928 } | |
| 929 | |
| 930 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
| 931 if (_field_map != NULL) { | |
| 932 delete _field_map; | |
| 933 } | |
| 934 } | |
| 935 | |
| 936 // Marker class to ensure that the class file map cache is only used in a defined | |
| 937 // scope. | |
| 938 class ClassFieldMapCacheMark : public StackObj { | |
| 939 private: | |
| 940 static bool _is_active; | |
| 941 public: | |
| 942 ClassFieldMapCacheMark() { | |
| 943 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 944 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
| 945 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
| 946 _is_active = true; | |
| 947 } | |
| 948 ~ClassFieldMapCacheMark() { | |
| 949 JvmtiCachedClassFieldMap::clear_cache(); | |
| 950 _is_active = false; | |
| 951 } | |
| 952 static bool is_active() { return _is_active; } | |
| 953 }; | |
| 954 | |
| 955 bool ClassFieldMapCacheMark::_is_active; | |
| 956 | |
| 957 | |
| 958 // record that the given instanceKlass is caching a field map | |
| 959 void JvmtiCachedClassFieldMap::add_to_class_list(instanceKlass* ik) { | |
| 960 if (_class_list == NULL) { | |
| 6197 | 961 _class_list = new (ResourceObj::C_HEAP, mtInternal) |
| 962 GrowableArray<instanceKlass*>(initial_class_count, true); | |
| 0 | 963 } |
| 964 _class_list->push(ik); | |
| 965 } | |
| 966 | |
| 967 // returns the instance field map for the given object | |
| 968 // (returns field map cached by the instanceKlass if possible) | |
| 969 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { | |
| 970 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 971 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
| 972 | |
| 973 klassOop k = obj->klass(); | |
| 974 instanceKlass* ik = instanceKlass::cast(k); | |
| 975 | |
| 976 // return cached map if possible | |
| 977 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
| 978 if (cached_map != NULL) { | |
| 979 assert(cached_map->field_map() != NULL, "missing field list"); | |
| 980 return cached_map->field_map(); | |
| 981 } else { | |
| 982 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
| 983 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
| 984 ik->set_jvmti_cached_class_field_map(cached_map); | |
| 985 add_to_class_list(ik); | |
| 986 return field_map; | |
| 987 } | |
| 988 } | |
| 989 | |
| 990 // remove the fields maps cached from all instanceKlasses | |
| 991 void JvmtiCachedClassFieldMap::clear_cache() { | |
| 992 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 993 if (_class_list != NULL) { | |
| 994 for (int i = 0; i < _class_list->length(); i++) { | |
| 995 instanceKlass* ik = _class_list->at(i); | |
| 996 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
| 997 assert(cached_map != NULL, "should not be NULL"); | |
| 998 ik->set_jvmti_cached_class_field_map(NULL); | |
| 999 delete cached_map; // deletes the encapsulated field map | |
| 1000 } | |
| 1001 delete _class_list; | |
| 1002 _class_list = NULL; | |
| 1003 } | |
| 1004 } | |
| 1005 | |
| 1006 // returns the number of ClassFieldMap cached by instanceKlasses | |
| 1007 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
| 1008 return (_class_list == NULL) ? 0 : _class_list->length(); | |
| 1009 } | |
| 1010 | |
| 1011 // helper function to indicate if an object is filtered by its tag or class tag | |
| 1012 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
| 1013 jlong klass_tag, | |
| 1014 int heap_filter) { | |
| 1015 // apply the heap filter | |
| 1016 if (obj_tag != 0) { | |
| 1017 // filter out tagged objects | |
| 1018 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
| 1019 } else { | |
| 1020 // filter out untagged objects | |
| 1021 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
| 1022 } | |
| 1023 if (klass_tag != 0) { | |
| 1024 // filter out objects with tagged classes | |
| 1025 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
| 1026 } else { | |
| 1027 // filter out objects with untagged classes. | |
| 1028 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
| 1029 } | |
| 1030 return false; | |
| 1031 } | |
| 1032 | |
| 1033 // helper function to indicate if an object is filtered by a klass filter | |
| 1034 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
| 1035 if (!klass_filter.is_null()) { | |
| 1036 if (obj->klass() != klass_filter()) { | |
| 1037 return true; | |
| 1038 } | |
| 1039 } | |
| 1040 return false; | |
| 1041 } | |
| 1042 | |
| 1043 // helper function to tell if a field is a primitive field or not | |
| 1044 static inline bool is_primitive_field_type(char type) { | |
| 1045 return (type != 'L' && type != '['); | |
| 1046 } | |
| 1047 | |
| 1048 // helper function to copy the value from location addr to jvalue. | |
| 1049 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
| 1050 switch (value_type) { | |
| 1051 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
| 1052 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
| 1053 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
| 1054 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
| 1055 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
| 1056 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
| 1057 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
| 1058 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
| 1059 default: ShouldNotReachHere(); | |
| 1060 } | |
| 1061 } | |
| 1062 | |
| 1063 // helper function to invoke string primitive value callback | |
| 1064 // returns visit control flags | |
| 1065 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
| 1066 CallbackWrapper* wrapper, | |
| 1067 oop str, | |
| 1068 void* user_data) | |
| 1069 { | |
| 1142 | 1070 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
| 0 | 1071 |
| 1072 // get the string value and length | |
| 1073 // (string value may be offset from the base) | |
| 1074 int s_len = java_lang_String::length(str); | |
| 1075 typeArrayOop s_value = java_lang_String::value(str); | |
| 1076 int s_offset = java_lang_String::offset(str); | |
| 1077 jchar* value; | |
| 1078 if (s_len > 0) { | |
| 1079 value = s_value->char_at_addr(s_offset); | |
| 1080 } else { | |
| 1081 value = (jchar*) s_value->base(T_CHAR); | |
| 1082 } | |
| 1083 | |
| 1084 // invoke the callback | |
| 1085 return (*cb)(wrapper->klass_tag(), | |
| 1086 wrapper->obj_size(), | |
| 1087 wrapper->obj_tag_p(), | |
| 1088 value, | |
| 1089 (jint)s_len, | |
| 1090 user_data); | |
| 1091 } | |
| 1092 | |
| 1093 // helper function to invoke string primitive value callback | |
| 1094 // returns visit control flags | |
| 1095 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
| 1096 CallbackWrapper* wrapper, | |
| 1097 oop obj, | |
| 1098 void* user_data) | |
| 1099 { | |
| 1100 assert(obj->is_typeArray(), "not a primitive array"); | |
| 1101 | |
| 1102 // get base address of first element | |
| 1103 typeArrayOop array = typeArrayOop(obj); | |
| 1104 BasicType type = typeArrayKlass::cast(array->klass())->element_type(); | |
| 1105 void* elements = array->base(type); | |
| 1106 | |
| 1107 // jvmtiPrimitiveType is defined so this mapping is always correct | |
| 1108 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
| 1109 | |
| 1110 return (*cb)(wrapper->klass_tag(), | |
| 1111 wrapper->obj_size(), | |
| 1112 wrapper->obj_tag_p(), | |
| 1113 (jint)array->length(), | |
| 1114 elem_type, | |
| 1115 elements, | |
| 1116 user_data); | |
| 1117 } | |
| 1118 | |
| 1119 // helper function to invoke the primitive field callback for all static fields | |
| 1120 // of a given class | |
| 1121 static jint invoke_primitive_field_callback_for_static_fields | |
| 1122 (CallbackWrapper* wrapper, | |
| 1123 oop obj, | |
| 1124 jvmtiPrimitiveFieldCallback cb, | |
| 1125 void* user_data) | |
| 1126 { | |
| 1127 // for static fields only the index will be set | |
| 1128 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 1129 | |
| 1142 | 1130 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
| 0 | 1131 if (java_lang_Class::is_primitive(obj)) { |
| 1132 return 0; | |
| 1133 } | |
| 1134 klassOop k = java_lang_Class::as_klassOop(obj); | |
| 1135 Klass* klass = k->klass_part(); | |
| 1136 | |
| 1137 // ignore classes for object and type arrays | |
| 1138 if (!klass->oop_is_instance()) { | |
| 1139 return 0; | |
| 1140 } | |
| 1141 | |
| 1142 // ignore classes which aren't linked yet | |
| 1143 instanceKlass* ik = instanceKlass::cast(k); | |
| 1144 if (!ik->is_linked()) { | |
| 1145 return 0; | |
| 1146 } | |
| 1147 | |
| 1148 // get the field map | |
| 1149 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
| 1150 | |
| 1151 // invoke the callback for each static primitive field | |
| 1152 for (int i=0; i<field_map->field_count(); i++) { | |
| 1153 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 1154 | |
| 1155 // ignore non-primitive fields | |
| 1156 char type = field->field_type(); | |
| 1157 if (!is_primitive_field_type(type)) { | |
| 1158 continue; | |
| 1159 } | |
| 1160 // one-to-one mapping | |
| 1161 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 1162 | |
| 1163 // get offset and field value | |
| 1164 int offset = field->field_offset(); | |
| 1165 address addr = (address)k + offset; | |
| 1166 jvalue value; | |
| 1167 copy_to_jvalue(&value, addr, value_type); | |
| 1168 | |
| 1169 // field index | |
| 1170 reference_info.field.index = field->field_index(); | |
| 1171 | |
| 1172 // invoke the callback | |
| 1173 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
| 1174 &reference_info, | |
| 1175 wrapper->klass_tag(), | |
| 1176 wrapper->obj_tag_p(), | |
| 1177 value, | |
| 1178 value_type, | |
| 1179 user_data); | |
| 1180 if (res & JVMTI_VISIT_ABORT) { | |
| 1181 delete field_map; | |
| 1182 return res; | |
| 1183 } | |
| 1184 } | |
| 1185 | |
| 1186 delete field_map; | |
| 1187 return 0; | |
| 1188 } | |
| 1189 | |
| 1190 // helper function to invoke the primitive field callback for all instance fields | |
| 1191 // of a given object | |
| 1192 static jint invoke_primitive_field_callback_for_instance_fields( | |
| 1193 CallbackWrapper* wrapper, | |
| 1194 oop obj, | |
| 1195 jvmtiPrimitiveFieldCallback cb, | |
| 1196 void* user_data) | |
| 1197 { | |
| 1198 // for instance fields only the index will be set | |
| 1199 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 1200 | |
| 1201 // get the map of the instance fields | |
| 1202 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
| 1203 | |
| 1204 // invoke the callback for each instance primitive field | |
| 1205 for (int i=0; i<fields->field_count(); i++) { | |
| 1206 ClassFieldDescriptor* field = fields->field_at(i); | |
| 1207 | |
| 1208 // ignore non-primitive fields | |
| 1209 char type = field->field_type(); | |
| 1210 if (!is_primitive_field_type(type)) { | |
| 1211 continue; | |
| 1212 } | |
| 1213 // one-to-one mapping | |
| 1214 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 1215 | |
| 1216 // get offset and field value | |
| 1217 int offset = field->field_offset(); | |
| 1218 address addr = (address)obj + offset; | |
| 1219 jvalue value; | |
| 1220 copy_to_jvalue(&value, addr, value_type); | |
| 1221 | |
| 1222 // field index | |
| 1223 reference_info.field.index = field->field_index(); | |
| 1224 | |
| 1225 // invoke the callback | |
| 1226 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
| 1227 &reference_info, | |
| 1228 wrapper->klass_tag(), | |
| 1229 wrapper->obj_tag_p(), | |
| 1230 value, | |
| 1231 value_type, | |
| 1232 user_data); | |
| 1233 if (res & JVMTI_VISIT_ABORT) { | |
| 1234 return res; | |
| 1235 } | |
| 1236 } | |
| 1237 return 0; | |
| 1238 } | |
| 1239 | |
| 1240 | |
| 1241 // VM operation to iterate over all objects in the heap (both reachable | |
| 1242 // and unreachable) | |
| 1243 class VM_HeapIterateOperation: public VM_Operation { | |
| 1244 private: | |
| 1245 ObjectClosure* _blk; | |
| 1246 public: | |
| 1247 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
| 1248 | |
| 1249 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
| 1250 void doit() { | |
| 1251 // allows class files maps to be cached during iteration | |
| 1252 ClassFieldMapCacheMark cm; | |
| 1253 | |
| 1254 // make sure that heap is parsable (fills TLABs with filler objects) | |
| 1255 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
| 1256 | |
| 1257 // Verify heap before iteration - if the heap gets corrupted then | |
| 1258 // JVMTI's IterateOverHeap will crash. | |
| 1259 if (VerifyBeforeIteration) { | |
| 1260 Universe::verify(); | |
| 1261 } | |
| 1262 | |
| 1263 // do the iteration | |
|
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1264 // If this operation encounters a bad object when using CMS, |
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1265 // consider using safe_object_iterate() which avoids perm gen |
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1266 // objects that may contain bad references. |
| 0 | 1267 Universe::heap()->object_iterate(_blk); |
| 1268 | |
| 1269 // when sharing is enabled we must iterate over the shared spaces | |
| 1270 if (UseSharedSpaces) { | |
| 1271 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 1272 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
| 1273 gen->ro_space()->object_iterate(_blk); | |
| 1274 gen->rw_space()->object_iterate(_blk); | |
| 1275 } | |
| 1276 } | |
| 1277 | |
| 1278 }; | |
| 1279 | |
| 1280 | |
| 1281 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
| 1282 // IterateOverInstancesOfClass functions | |
| 1283 class IterateOverHeapObjectClosure: public ObjectClosure { | |
| 1284 private: | |
| 1285 JvmtiTagMap* _tag_map; | |
| 1286 KlassHandle _klass; | |
| 1287 jvmtiHeapObjectFilter _object_filter; | |
| 1288 jvmtiHeapObjectCallback _heap_object_callback; | |
| 1289 const void* _user_data; | |
| 1290 | |
| 1291 // accessors | |
| 1292 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 1293 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
| 1294 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
| 1295 KlassHandle klass() const { return _klass; } | |
| 1296 const void* user_data() const { return _user_data; } | |
| 1297 | |
| 1298 // indicates if iteration has been aborted | |
| 1299 bool _iteration_aborted; | |
| 1300 bool is_iteration_aborted() const { return _iteration_aborted; } | |
| 1301 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
| 1302 | |
| 1303 public: | |
| 1304 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
| 1305 KlassHandle klass, | |
| 1306 jvmtiHeapObjectFilter object_filter, | |
| 1307 jvmtiHeapObjectCallback heap_object_callback, | |
| 1308 const void* user_data) : | |
| 1309 _tag_map(tag_map), | |
| 1310 _klass(klass), | |
| 1311 _object_filter(object_filter), | |
| 1312 _heap_object_callback(heap_object_callback), | |
| 1313 _user_data(user_data), | |
| 1314 _iteration_aborted(false) | |
| 1315 { | |
| 1316 } | |
| 1317 | |
| 1318 void do_object(oop o); | |
| 1319 }; | |
| 1320 | |
| 1321 // invoked for each object in the heap | |
| 1322 void IterateOverHeapObjectClosure::do_object(oop o) { | |
| 1323 // check if iteration has been halted | |
| 1324 if (is_iteration_aborted()) return; | |
| 1325 | |
| 1326 // ignore any objects that aren't visible to profiler | |
| 1327 if (!ServiceUtil::visible_oop(o)) return; | |
| 1328 | |
| 1329 // instanceof check when filtering by klass | |
| 1330 if (!klass().is_null() && !o->is_a(klass()())) { | |
| 1331 return; | |
| 1332 } | |
| 1333 // prepare for the calllback | |
| 1334 CallbackWrapper wrapper(tag_map(), o); | |
| 1335 | |
| 1336 // if the object is tagged and we're only interested in untagged objects | |
| 1337 // then don't invoke the callback. Similiarly, if the object is untagged | |
| 1338 // and we're only interested in tagged objects we skip the callback. | |
| 1339 if (wrapper.obj_tag() != 0) { | |
| 1340 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
| 1341 } else { | |
| 1342 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
| 1343 } | |
| 1344 | |
| 1345 // invoke the agent's callback | |
| 1346 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
| 1347 wrapper.obj_size(), | |
| 1348 wrapper.obj_tag_p(), | |
| 1349 (void*)user_data()); | |
| 1350 if (control == JVMTI_ITERATION_ABORT) { | |
| 1351 set_iteration_aborted(true); | |
| 1352 } | |
| 1353 } | |
| 1354 | |
| 1355 // An ObjectClosure used to support the IterateThroughHeap function | |
| 1356 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
| 1357 private: | |
| 1358 JvmtiTagMap* _tag_map; | |
| 1359 KlassHandle _klass; | |
| 1360 int _heap_filter; | |
| 1361 const jvmtiHeapCallbacks* _callbacks; | |
| 1362 const void* _user_data; | |
| 1363 | |
| 1364 // accessor functions | |
| 1365 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 1366 int heap_filter() const { return _heap_filter; } | |
| 1367 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
| 1368 KlassHandle klass() const { return _klass; } | |
| 1369 const void* user_data() const { return _user_data; } | |
| 1370 | |
| 1371 // indicates if the iteration has been aborted | |
| 1372 bool _iteration_aborted; | |
| 1373 bool is_iteration_aborted() const { return _iteration_aborted; } | |
| 1374 | |
| 1375 // used to check the visit control flags. If the abort flag is set | |
| 1376 // then we set the iteration aborted flag so that the iteration completes | |
| 1377 // without processing any further objects | |
| 1378 bool check_flags_for_abort(jint flags) { | |
| 1379 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
| 1380 if (is_abort) { | |
| 1381 _iteration_aborted = true; | |
| 1382 } | |
| 1383 return is_abort; | |
| 1384 } | |
| 1385 | |
| 1386 public: | |
| 1387 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
| 1388 KlassHandle klass, | |
| 1389 int heap_filter, | |
| 1390 const jvmtiHeapCallbacks* heap_callbacks, | |
| 1391 const void* user_data) : | |
| 1392 _tag_map(tag_map), | |
| 1393 _klass(klass), | |
| 1394 _heap_filter(heap_filter), | |
| 1395 _callbacks(heap_callbacks), | |
| 1396 _user_data(user_data), | |
| 1397 _iteration_aborted(false) | |
| 1398 { | |
| 1399 } | |
| 1400 | |
| 1401 void do_object(oop o); | |
| 1402 }; | |
| 1403 | |
| 1404 // invoked for each object in the heap | |
| 1405 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
| 1406 // check if iteration has been halted | |
| 1407 if (is_iteration_aborted()) return; | |
| 1408 | |
| 1409 // ignore any objects that aren't visible to profiler | |
| 1410 if (!ServiceUtil::visible_oop(obj)) return; | |
| 1411 | |
| 1412 // apply class filter | |
| 1413 if (is_filtered_by_klass_filter(obj, klass())) return; | |
| 1414 | |
| 1415 // prepare for callback | |
| 1416 CallbackWrapper wrapper(tag_map(), obj); | |
| 1417 | |
| 1418 // check if filtered by the heap filter | |
| 1419 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
| 1420 return; | |
| 1421 } | |
| 1422 | |
| 1423 // for arrays we need the length, otherwise -1 | |
| 1424 bool is_array = obj->is_array(); | |
| 1425 int len = is_array ? arrayOop(obj)->length() : -1; | |
| 1426 | |
| 1427 // invoke the object callback (if callback is provided) | |
| 1428 if (callbacks()->heap_iteration_callback != NULL) { | |
| 1429 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
| 1430 jint res = (*cb)(wrapper.klass_tag(), | |
| 1431 wrapper.obj_size(), | |
| 1432 wrapper.obj_tag_p(), | |
| 1433 (jint)len, | |
| 1434 (void*)user_data()); | |
| 1435 if (check_flags_for_abort(res)) return; | |
| 1436 } | |
| 1437 | |
| 1438 // for objects and classes we report primitive fields if callback provided | |
| 1439 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
| 1440 jint res; | |
| 1441 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
| 1142 | 1442 if (obj->klass() == SystemDictionary::Class_klass()) { |
| 0 | 1443 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
| 1444 obj, | |
| 1445 cb, | |
| 1446 (void*)user_data()); | |
| 1447 } else { | |
| 1448 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
| 1449 obj, | |
| 1450 cb, | |
| 1451 (void*)user_data()); | |
| 1452 } | |
| 1453 if (check_flags_for_abort(res)) return; | |
| 1454 } | |
| 1455 | |
| 1456 // string callback | |
| 1457 if (!is_array && | |
| 1458 callbacks()->string_primitive_value_callback != NULL && | |
| 1142 | 1459 obj->klass() == SystemDictionary::String_klass()) { |
| 0 | 1460 jint res = invoke_string_value_callback( |
| 1461 callbacks()->string_primitive_value_callback, | |
| 1462 &wrapper, | |
| 1463 obj, | |
| 1464 (void*)user_data() ); | |
| 1465 if (check_flags_for_abort(res)) return; | |
| 1466 } | |
| 1467 | |
| 1468 // array callback | |
| 1469 if (is_array && | |
| 1470 callbacks()->array_primitive_value_callback != NULL && | |
| 1471 obj->is_typeArray()) { | |
| 1472 jint res = invoke_array_primitive_value_callback( | |
| 1473 callbacks()->array_primitive_value_callback, | |
| 1474 &wrapper, | |
| 1475 obj, | |
| 1476 (void*)user_data() ); | |
| 1477 if (check_flags_for_abort(res)) return; | |
| 1478 } | |
| 1479 }; | |
| 1480 | |
| 1481 | |
| 1482 // Deprecated function to iterate over all objects in the heap | |
| 1483 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
| 1484 KlassHandle klass, | |
| 1485 jvmtiHeapObjectCallback heap_object_callback, | |
| 1486 const void* user_data) | |
| 1487 { | |
| 1488 MutexLocker ml(Heap_lock); | |
| 1489 IterateOverHeapObjectClosure blk(this, | |
| 1490 klass, | |
| 1491 object_filter, | |
| 1492 heap_object_callback, | |
| 1493 user_data); | |
| 1494 VM_HeapIterateOperation op(&blk); | |
| 1495 VMThread::execute(&op); | |
| 1496 } | |
| 1497 | |
| 1498 | |
| 1499 // Iterates over all objects in the heap | |
| 1500 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
| 1501 KlassHandle klass, | |
| 1502 const jvmtiHeapCallbacks* callbacks, | |
| 1503 const void* user_data) | |
| 1504 { | |
| 1505 MutexLocker ml(Heap_lock); | |
| 1506 IterateThroughHeapObjectClosure blk(this, | |
| 1507 klass, | |
| 1508 heap_filter, | |
| 1509 callbacks, | |
| 1510 user_data); | |
| 1511 VM_HeapIterateOperation op(&blk); | |
| 1512 VMThread::execute(&op); | |
| 1513 } | |
| 1514 | |
| 1515 // support class for get_objects_with_tags | |
| 1516 | |
| 1517 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
| 1518 private: | |
| 1519 JvmtiEnv* _env; | |
| 1520 jlong* _tags; | |
| 1521 jint _tag_count; | |
| 1522 | |
| 1523 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
| 1524 GrowableArray<uint64_t>* _tag_results; // collected tags | |
| 1525 | |
| 1526 public: | |
| 1527 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
| 1528 _env = env; | |
| 1529 _tags = (jlong*)tags; | |
| 1530 _tag_count = tag_count; | |
| 6197 | 1531 _object_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jobject>(1,true); |
| 1532 _tag_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<uint64_t>(1,true); | |
| 0 | 1533 } |
| 1534 | |
| 1535 ~TagObjectCollector() { | |
| 1536 delete _object_results; | |
| 1537 delete _tag_results; | |
| 1538 } | |
| 1539 | |
| 1540 // for each tagged object check if the tag value matches | |
| 1541 // - if it matches then we create a JNI local reference to the object | |
| 1542 // and record the reference and tag value. | |
| 1543 // | |
| 1544 void do_entry(JvmtiTagHashmapEntry* entry) { | |
| 1545 for (int i=0; i<_tag_count; i++) { | |
| 1546 if (_tags[i] == entry->tag()) { | |
|
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1547 oop o = entry->object(); |
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|
1548 assert(o != NULL, "sanity check"); |
| 0 | 1549 |
| 1550 // the mirror is tagged | |
| 1551 if (o->is_klass()) { | |
| 1552 klassOop k = (klassOop)o; | |
| 1553 o = Klass::cast(k)->java_mirror(); | |
| 1554 } | |
| 1555 | |
| 1556 jobject ref = JNIHandles::make_local(JavaThread::current(), o); | |
| 1557 _object_results->append(ref); | |
| 1558 _tag_results->append((uint64_t)entry->tag()); | |
| 1559 } | |
| 1560 } | |
| 1561 } | |
| 1562 | |
| 1563 // return the results from the collection | |
| 1564 // | |
| 1565 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
| 1566 jvmtiError error; | |
| 1567 int count = _object_results->length(); | |
| 1568 assert(count >= 0, "sanity check"); | |
| 1569 | |
| 1570 // if object_result_ptr is not NULL then allocate the result and copy | |
| 1571 // in the object references. | |
| 1572 if (object_result_ptr != NULL) { | |
| 1573 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
| 1574 if (error != JVMTI_ERROR_NONE) { | |
| 1575 return error; | |
| 1576 } | |
| 1577 for (int i=0; i<count; i++) { | |
| 1578 (*object_result_ptr)[i] = _object_results->at(i); | |
| 1579 } | |
| 1580 } | |
| 1581 | |
| 1582 // if tag_result_ptr is not NULL then allocate the result and copy | |
| 1583 // in the tag values. | |
| 1584 if (tag_result_ptr != NULL) { | |
| 1585 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
| 1586 if (error != JVMTI_ERROR_NONE) { | |
| 1587 if (object_result_ptr != NULL) { | |
| 1588 _env->Deallocate((unsigned char*)object_result_ptr); | |
| 1589 } | |
| 1590 return error; | |
| 1591 } | |
| 1592 for (int i=0; i<count; i++) { | |
| 1593 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
| 1594 } | |
| 1595 } | |
| 1596 | |
| 1597 *count_ptr = count; | |
| 1598 return JVMTI_ERROR_NONE; | |
| 1599 } | |
| 1600 }; | |
| 1601 | |
| 1602 // return the list of objects with the specified tags | |
| 1603 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
| 1604 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
| 1605 | |
| 1606 TagObjectCollector collector(env(), tags, count); | |
| 1607 { | |
| 1608 // iterate over all tagged objects | |
| 1609 MutexLocker ml(lock()); | |
| 1610 entry_iterate(&collector); | |
| 1611 } | |
| 1612 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
| 1613 } | |
| 1614 | |
| 1615 | |
| 1616 // ObjectMarker is used to support the marking objects when walking the | |
| 1617 // heap. | |
| 1618 // | |
| 1619 // This implementation uses the existing mark bits in an object for | |
| 1620 // marking. Objects that are marked must later have their headers restored. | |
| 1621 // As most objects are unlocked and don't have their identity hash computed | |
| 1622 // we don't have to save their headers. Instead we save the headers that | |
| 1623 // are "interesting". Later when the headers are restored this implementation | |
| 1624 // restores all headers to their initial value and then restores the few | |
| 1625 // objects that had interesting headers. | |
| 1626 // | |
| 1627 // Future work: This implementation currently uses growable arrays to save | |
| 1628 // the oop and header of interesting objects. As an optimization we could | |
| 1629 // use the same technique as the GC and make use of the unused area | |
| 1630 // between top() and end(). | |
| 1631 // | |
| 1632 | |
| 1633 // An ObjectClosure used to restore the mark bits of an object | |
| 1634 class RestoreMarksClosure : public ObjectClosure { | |
| 1635 public: | |
| 1636 void do_object(oop o) { | |
| 1637 if (o != NULL) { | |
| 1638 markOop mark = o->mark(); | |
| 1639 if (mark->is_marked()) { | |
| 1640 o->init_mark(); | |
| 1641 } | |
| 1642 } | |
| 1643 } | |
| 1644 }; | |
| 1645 | |
| 1646 // ObjectMarker provides the mark and visited functions | |
| 1647 class ObjectMarker : AllStatic { | |
| 1648 private: | |
| 1649 // saved headers | |
| 1650 static GrowableArray<oop>* _saved_oop_stack; | |
| 1651 static GrowableArray<markOop>* _saved_mark_stack; | |
| 3815 | 1652 static bool _needs_reset; // do we need to reset mark bits? |
| 0 | 1653 |
| 1654 public: | |
| 1655 static void init(); // initialize | |
| 1656 static void done(); // clean-up | |
| 1657 | |
| 1658 static inline void mark(oop o); // mark an object | |
| 1659 static inline bool visited(oop o); // check if object has been visited | |
| 3815 | 1660 |
| 1661 static inline bool needs_reset() { return _needs_reset; } | |
| 1662 static inline void set_needs_reset(bool v) { _needs_reset = v; } | |
| 0 | 1663 }; |
| 1664 | |
| 1665 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
| 1666 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
| 3815 | 1667 bool ObjectMarker::_needs_reset = true; // need to reset mark bits by default |
| 0 | 1668 |
| 1669 // initialize ObjectMarker - prepares for object marking | |
| 1670 void ObjectMarker::init() { | |
| 1671 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 1672 | |
| 1673 // prepare heap for iteration | |
| 1674 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
| 1675 | |
| 1676 // create stacks for interesting headers | |
| 6197 | 1677 _saved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markOop>(4000, true); |
| 1678 _saved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(4000, true); | |
| 0 | 1679 |
| 1680 if (UseBiasedLocking) { | |
| 1681 BiasedLocking::preserve_marks(); | |
| 1682 } | |
| 1683 } | |
| 1684 | |
| 1685 // Object marking is done so restore object headers | |
| 1686 void ObjectMarker::done() { | |
| 1687 // iterate over all objects and restore the mark bits to | |
| 1688 // their initial value | |
| 1689 RestoreMarksClosure blk; | |
| 3815 | 1690 if (needs_reset()) { |
| 1691 Universe::heap()->object_iterate(&blk); | |
| 1692 } else { | |
| 1693 // We don't need to reset mark bits on this call, but reset the | |
| 1694 // flag to the default for the next call. | |
| 1695 set_needs_reset(true); | |
| 1696 } | |
| 0 | 1697 |
| 1698 // When sharing is enabled we need to restore the headers of the objects | |
| 1699 // in the readwrite space too. | |
| 1700 if (UseSharedSpaces) { | |
| 1701 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 1702 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
| 1703 gen->rw_space()->object_iterate(&blk); | |
| 1704 } | |
| 1705 | |
| 1706 // now restore the interesting headers | |
| 1707 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
| 1708 oop o = _saved_oop_stack->at(i); | |
| 1709 markOop mark = _saved_mark_stack->at(i); | |
| 1710 o->set_mark(mark); | |
| 1711 } | |
| 1712 | |
| 1713 if (UseBiasedLocking) { | |
| 1714 BiasedLocking::restore_marks(); | |
| 1715 } | |
| 1716 | |
| 1717 // free the stacks | |
| 1718 delete _saved_oop_stack; | |
| 1719 delete _saved_mark_stack; | |
| 1720 } | |
| 1721 | |
| 1722 // mark an object | |
| 1723 inline void ObjectMarker::mark(oop o) { | |
| 1724 assert(Universe::heap()->is_in(o), "sanity check"); | |
| 1725 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
| 1726 | |
| 1727 // object's mark word | |
| 1728 markOop mark = o->mark(); | |
| 1729 | |
| 1730 if (mark->must_be_preserved(o)) { | |
| 1731 _saved_mark_stack->push(mark); | |
| 1732 _saved_oop_stack->push(o); | |
| 1733 } | |
| 1734 | |
| 1735 // mark the object | |
| 1736 o->set_mark(markOopDesc::prototype()->set_marked()); | |
| 1737 } | |
| 1738 | |
| 1739 // return true if object is marked | |
| 1740 inline bool ObjectMarker::visited(oop o) { | |
| 1741 return o->mark()->is_marked(); | |
| 1742 } | |
| 1743 | |
| 1744 // Stack allocated class to help ensure that ObjectMarker is used | |
| 1745 // correctly. Constructor initializes ObjectMarker, destructor calls | |
| 1746 // ObjectMarker's done() function to restore object headers. | |
| 1747 class ObjectMarkerController : public StackObj { | |
| 1748 public: | |
| 1749 ObjectMarkerController() { | |
| 1750 ObjectMarker::init(); | |
| 1751 } | |
| 1752 ~ObjectMarkerController() { | |
| 1753 ObjectMarker::done(); | |
| 1754 } | |
| 1755 }; | |
| 1756 | |
| 1757 | |
| 1758 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
| 1759 // (not performance critical as only used for roots) | |
| 1760 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
| 1761 switch (kind) { | |
| 1762 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
| 1763 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
| 1764 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
| 1765 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
| 1766 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
| 1767 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
| 1768 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
| 1769 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
| 1770 } | |
| 1771 } | |
| 1772 | |
| 1773 // Base class for all heap walk contexts. The base class maintains a flag | |
| 1774 // to indicate if the context is valid or not. | |
| 1775 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
| 1776 private: | |
| 1777 bool _valid; | |
| 1778 public: | |
| 1779 HeapWalkContext(bool valid) { _valid = valid; } | |
| 1780 void invalidate() { _valid = false; } | |
| 1781 bool is_valid() const { return _valid; } | |
| 1782 }; | |
| 1783 | |
| 1784 // A basic heap walk context for the deprecated heap walking functions. | |
| 1785 // The context for a basic heap walk are the callbacks and fields used by | |
| 1786 // the referrer caching scheme. | |
| 1787 class BasicHeapWalkContext: public HeapWalkContext { | |
| 1788 private: | |
| 1789 jvmtiHeapRootCallback _heap_root_callback; | |
| 1790 jvmtiStackReferenceCallback _stack_ref_callback; | |
| 1791 jvmtiObjectReferenceCallback _object_ref_callback; | |
| 1792 | |
| 1793 // used for caching | |
| 1794 oop _last_referrer; | |
| 1795 jlong _last_referrer_tag; | |
| 1796 | |
| 1797 public: | |
| 1798 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
| 1799 | |
| 1800 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
| 1801 jvmtiStackReferenceCallback stack_ref_callback, | |
| 1802 jvmtiObjectReferenceCallback object_ref_callback) : | |
| 1803 HeapWalkContext(true), | |
| 1804 _heap_root_callback(heap_root_callback), | |
| 1805 _stack_ref_callback(stack_ref_callback), | |
| 1806 _object_ref_callback(object_ref_callback), | |
| 1807 _last_referrer(NULL), | |
| 1808 _last_referrer_tag(0) { | |
| 1809 } | |
| 1810 | |
| 1811 // accessors | |
| 1812 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
| 1813 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
| 1814 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
| 1815 | |
| 1816 oop last_referrer() const { return _last_referrer; } | |
| 1817 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
| 1818 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
| 1819 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
| 1820 }; | |
| 1821 | |
| 1822 // The advanced heap walk context for the FollowReferences functions. | |
| 1823 // The context is the callbacks, and the fields used for filtering. | |
| 1824 class AdvancedHeapWalkContext: public HeapWalkContext { | |
| 1825 private: | |
| 1826 jint _heap_filter; | |
| 1827 KlassHandle _klass_filter; | |
| 1828 const jvmtiHeapCallbacks* _heap_callbacks; | |
| 1829 | |
| 1830 public: | |
| 1831 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
| 1832 | |
| 1833 AdvancedHeapWalkContext(jint heap_filter, | |
| 1834 KlassHandle klass_filter, | |
| 1835 const jvmtiHeapCallbacks* heap_callbacks) : | |
| 1836 HeapWalkContext(true), | |
| 1837 _heap_filter(heap_filter), | |
| 1838 _klass_filter(klass_filter), | |
| 1839 _heap_callbacks(heap_callbacks) { | |
| 1840 } | |
| 1841 | |
| 1842 // accessors | |
| 1843 jint heap_filter() const { return _heap_filter; } | |
| 1844 KlassHandle klass_filter() const { return _klass_filter; } | |
| 1845 | |
| 1846 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
| 1847 return _heap_callbacks->heap_reference_callback; | |
| 1848 }; | |
| 1849 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
| 1850 return _heap_callbacks->primitive_field_callback; | |
| 1851 } | |
| 1852 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
| 1853 return _heap_callbacks->array_primitive_value_callback; | |
| 1854 } | |
| 1855 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
| 1856 return _heap_callbacks->string_primitive_value_callback; | |
| 1857 } | |
| 1858 }; | |
| 1859 | |
| 1860 // The CallbackInvoker is a class with static functions that the heap walk can call | |
| 1861 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
| 1862 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
| 1863 // mode is for the newer FollowReferences function which supports a lot of | |
| 1864 // additional callbacks. | |
| 1865 class CallbackInvoker : AllStatic { | |
| 1866 private: | |
| 1867 // heap walk styles | |
| 1868 enum { basic, advanced }; | |
| 1869 static int _heap_walk_type; | |
| 1870 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
| 1871 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
| 1872 | |
| 1873 // context for basic style heap walk | |
| 1874 static BasicHeapWalkContext _basic_context; | |
| 1875 static BasicHeapWalkContext* basic_context() { | |
| 1876 assert(_basic_context.is_valid(), "invalid"); | |
| 1877 return &_basic_context; | |
| 1878 } | |
| 1879 | |
| 1880 // context for advanced style heap walk | |
| 1881 static AdvancedHeapWalkContext _advanced_context; | |
| 1882 static AdvancedHeapWalkContext* advanced_context() { | |
| 1883 assert(_advanced_context.is_valid(), "invalid"); | |
| 1884 return &_advanced_context; | |
| 1885 } | |
| 1886 | |
| 1887 // context needed for all heap walks | |
| 1888 static JvmtiTagMap* _tag_map; | |
| 1889 static const void* _user_data; | |
| 1890 static GrowableArray<oop>* _visit_stack; | |
| 1891 | |
| 1892 // accessors | |
| 1893 static JvmtiTagMap* tag_map() { return _tag_map; } | |
| 1894 static const void* user_data() { return _user_data; } | |
| 1895 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
| 1896 | |
| 1897 // if the object hasn't been visited then push it onto the visit stack | |
| 1898 // so that it will be visited later | |
| 1899 static inline bool check_for_visit(oop obj) { | |
| 1900 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
| 1901 return true; | |
| 1902 } | |
| 1903 | |
| 1904 // invoke basic style callbacks | |
| 1905 static inline bool invoke_basic_heap_root_callback | |
| 1906 (jvmtiHeapRootKind root_kind, oop obj); | |
| 1907 static inline bool invoke_basic_stack_ref_callback | |
| 1908 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
| 1909 int slot, oop obj); | |
| 1910 static inline bool invoke_basic_object_reference_callback | |
| 1911 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
| 1912 | |
| 1913 // invoke advanced style callbacks | |
| 1914 static inline bool invoke_advanced_heap_root_callback | |
| 1915 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
| 1916 static inline bool invoke_advanced_stack_ref_callback | |
| 1917 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
| 1918 jmethodID method, jlocation bci, jint slot, oop obj); | |
| 1919 static inline bool invoke_advanced_object_reference_callback | |
| 1920 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
| 1921 | |
| 1922 // used to report the value of primitive fields | |
| 1923 static inline bool report_primitive_field | |
| 1924 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
| 1925 | |
| 1926 public: | |
| 1927 // initialize for basic mode | |
| 1928 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
| 1929 GrowableArray<oop>* visit_stack, | |
| 1930 const void* user_data, | |
| 1931 BasicHeapWalkContext context); | |
| 1932 | |
| 1933 // initialize for advanced mode | |
| 1934 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
| 1935 GrowableArray<oop>* visit_stack, | |
| 1936 const void* user_data, | |
| 1937 AdvancedHeapWalkContext context); | |
| 1938 | |
| 1939 // functions to report roots | |
| 1940 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
| 1941 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
| 1942 jmethodID m, oop o); | |
| 1943 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
| 1944 jmethodID method, jlocation bci, jint slot, oop o); | |
| 1945 | |
| 1946 // functions to report references | |
| 1947 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
| 1948 static inline bool report_class_reference(oop referrer, oop referree); | |
| 1949 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
| 1950 static inline bool report_signers_reference(oop referrer, oop referree); | |
| 1951 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
| 1952 static inline bool report_superclass_reference(oop referrer, oop referree); | |
| 1953 static inline bool report_interface_reference(oop referrer, oop referree); | |
| 1954 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
| 1955 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
| 1956 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
| 1957 static inline bool report_primitive_array_values(oop array); | |
| 1958 static inline bool report_string_value(oop str); | |
| 1959 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
| 1960 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
| 1961 }; | |
| 1962 | |
| 1963 // statics | |
| 1964 int CallbackInvoker::_heap_walk_type; | |
| 1965 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
| 1966 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
| 1967 JvmtiTagMap* CallbackInvoker::_tag_map; | |
| 1968 const void* CallbackInvoker::_user_data; | |
| 1969 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
| 1970 | |
| 1971 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
| 1972 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
| 1973 GrowableArray<oop>* visit_stack, | |
| 1974 const void* user_data, | |
| 1975 BasicHeapWalkContext context) { | |
| 1976 _tag_map = tag_map; | |
| 1977 _visit_stack = visit_stack; | |
| 1978 _user_data = user_data; | |
| 1979 _basic_context = context; | |
| 1980 _advanced_context.invalidate(); // will trigger assertion if used | |
| 1981 _heap_walk_type = basic; | |
| 1982 } | |
| 1983 | |
| 1984 // initialize for advanced heap walk (FollowReferences) | |
| 1985 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
| 1986 GrowableArray<oop>* visit_stack, | |
| 1987 const void* user_data, | |
| 1988 AdvancedHeapWalkContext context) { | |
| 1989 _tag_map = tag_map; | |
| 1990 _visit_stack = visit_stack; | |
| 1991 _user_data = user_data; | |
| 1992 _advanced_context = context; | |
| 1993 _basic_context.invalidate(); // will trigger assertion if used | |
| 1994 _heap_walk_type = advanced; | |
| 1995 } | |
| 1996 | |
| 1997 | |
| 1998 // invoke basic style heap root callback | |
| 1999 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
| 2000 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2001 | |
| 2002 // if we heap roots should be reported | |
| 2003 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
| 2004 if (cb == NULL) { | |
| 2005 return check_for_visit(obj); | |
| 2006 } | |
| 2007 | |
| 2008 CallbackWrapper wrapper(tag_map(), obj); | |
| 2009 jvmtiIterationControl control = (*cb)(root_kind, | |
| 2010 wrapper.klass_tag(), | |
| 2011 wrapper.obj_size(), | |
| 2012 wrapper.obj_tag_p(), | |
| 2013 (void*)user_data()); | |
| 2014 // push root to visit stack when following references | |
| 2015 if (control == JVMTI_ITERATION_CONTINUE && | |
| 2016 basic_context()->object_ref_callback() != NULL) { | |
| 2017 visit_stack()->push(obj); | |
| 2018 } | |
| 2019 return control != JVMTI_ITERATION_ABORT; | |
| 2020 } | |
| 2021 | |
| 2022 // invoke basic style stack ref callback | |
| 2023 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
| 2024 jlong thread_tag, | |
| 2025 jint depth, | |
| 2026 jmethodID method, | |
| 2027 jint slot, | |
| 2028 oop obj) { | |
| 2029 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2030 | |
| 2031 // if we stack refs should be reported | |
| 2032 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
| 2033 if (cb == NULL) { | |
| 2034 return check_for_visit(obj); | |
| 2035 } | |
| 2036 | |
| 2037 CallbackWrapper wrapper(tag_map(), obj); | |
| 2038 jvmtiIterationControl control = (*cb)(root_kind, | |
| 2039 wrapper.klass_tag(), | |
| 2040 wrapper.obj_size(), | |
| 2041 wrapper.obj_tag_p(), | |
| 2042 thread_tag, | |
| 2043 depth, | |
| 2044 method, | |
| 2045 slot, | |
| 2046 (void*)user_data()); | |
| 2047 // push root to visit stack when following references | |
| 2048 if (control == JVMTI_ITERATION_CONTINUE && | |
| 2049 basic_context()->object_ref_callback() != NULL) { | |
| 2050 visit_stack()->push(obj); | |
| 2051 } | |
| 2052 return control != JVMTI_ITERATION_ABORT; | |
| 2053 } | |
| 2054 | |
| 2055 // invoke basic style object reference callback | |
| 2056 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
| 2057 oop referrer, | |
| 2058 oop referree, | |
| 2059 jint index) { | |
| 2060 | |
| 2061 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
| 2062 assert(ServiceUtil::visible_oop(referree), "checking"); | |
| 2063 | |
| 2064 BasicHeapWalkContext* context = basic_context(); | |
| 2065 | |
| 2066 // callback requires the referrer's tag. If it's the same referrer | |
| 2067 // as the last call then we use the cached value. | |
| 2068 jlong referrer_tag; | |
| 2069 if (referrer == context->last_referrer()) { | |
| 2070 referrer_tag = context->last_referrer_tag(); | |
| 2071 } else { | |
| 2072 referrer_tag = tag_for(tag_map(), klassOop_if_java_lang_Class(referrer)); | |
| 2073 } | |
| 2074 | |
| 2075 // do the callback | |
| 2076 CallbackWrapper wrapper(tag_map(), referree); | |
| 2077 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
| 2078 jvmtiIterationControl control = (*cb)(ref_kind, | |
| 2079 wrapper.klass_tag(), | |
| 2080 wrapper.obj_size(), | |
| 2081 wrapper.obj_tag_p(), | |
| 2082 referrer_tag, | |
| 2083 index, | |
| 2084 (void*)user_data()); | |
| 2085 | |
| 2086 // record referrer and referrer tag. For self-references record the | |
| 2087 // tag value from the callback as this might differ from referrer_tag. | |
| 2088 context->set_last_referrer(referrer); | |
| 2089 if (referrer == referree) { | |
| 2090 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
| 2091 } else { | |
| 2092 context->set_last_referrer_tag(referrer_tag); | |
| 2093 } | |
| 2094 | |
| 2095 if (control == JVMTI_ITERATION_CONTINUE) { | |
| 2096 return check_for_visit(referree); | |
| 2097 } else { | |
| 2098 return control != JVMTI_ITERATION_ABORT; | |
| 2099 } | |
| 2100 } | |
| 2101 | |
| 2102 // invoke advanced style heap root callback | |
| 2103 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2104 oop obj) { | |
| 2105 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2106 | |
| 2107 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2108 | |
| 2109 // check that callback is provided | |
| 2110 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2111 if (cb == NULL) { | |
| 2112 return check_for_visit(obj); | |
| 2113 } | |
| 2114 | |
| 2115 // apply class filter | |
| 2116 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2117 return check_for_visit(obj); | |
| 2118 } | |
| 2119 | |
| 2120 // setup the callback wrapper | |
| 2121 CallbackWrapper wrapper(tag_map(), obj); | |
| 2122 | |
| 2123 // apply tag filter | |
| 2124 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2125 wrapper.klass_tag(), | |
| 2126 context->heap_filter())) { | |
| 2127 return check_for_visit(obj); | |
| 2128 } | |
| 2129 | |
| 2130 // for arrays we need the length, otherwise -1 | |
| 2131 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2132 | |
| 2133 // invoke the callback | |
| 2134 jint res = (*cb)(ref_kind, | |
| 2135 NULL, // referrer info | |
| 2136 wrapper.klass_tag(), | |
| 2137 0, // referrer_class_tag is 0 for heap root | |
| 2138 wrapper.obj_size(), | |
| 2139 wrapper.obj_tag_p(), | |
| 2140 NULL, // referrer_tag_p | |
| 2141 len, | |
| 2142 (void*)user_data()); | |
| 2143 if (res & JVMTI_VISIT_ABORT) { | |
| 2144 return false;// referrer class tag | |
| 2145 } | |
| 2146 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2147 check_for_visit(obj); | |
| 2148 } | |
| 2149 return true; | |
| 2150 } | |
| 2151 | |
| 2152 // report a reference from a thread stack to an object | |
| 2153 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2154 jlong thread_tag, | |
| 2155 jlong tid, | |
| 2156 int depth, | |
| 2157 jmethodID method, | |
| 2158 jlocation bci, | |
| 2159 jint slot, | |
| 2160 oop obj) { | |
| 2161 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2162 | |
| 2163 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2164 | |
| 2165 // check that callback is provider | |
| 2166 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2167 if (cb == NULL) { | |
| 2168 return check_for_visit(obj); | |
| 2169 } | |
| 2170 | |
| 2171 // apply class filter | |
| 2172 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2173 return check_for_visit(obj); | |
| 2174 } | |
| 2175 | |
| 2176 // setup the callback wrapper | |
| 2177 CallbackWrapper wrapper(tag_map(), obj); | |
| 2178 | |
| 2179 // apply tag filter | |
| 2180 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2181 wrapper.klass_tag(), | |
| 2182 context->heap_filter())) { | |
| 2183 return check_for_visit(obj); | |
| 2184 } | |
| 2185 | |
| 2186 // setup the referrer info | |
| 2187 jvmtiHeapReferenceInfo reference_info; | |
| 2188 reference_info.stack_local.thread_tag = thread_tag; | |
| 2189 reference_info.stack_local.thread_id = tid; | |
| 2190 reference_info.stack_local.depth = depth; | |
| 2191 reference_info.stack_local.method = method; | |
| 2192 reference_info.stack_local.location = bci; | |
| 2193 reference_info.stack_local.slot = slot; | |
| 2194 | |
| 2195 // for arrays we need the length, otherwise -1 | |
| 2196 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2197 | |
| 2198 // call into the agent | |
| 2199 int res = (*cb)(ref_kind, | |
| 2200 &reference_info, | |
| 2201 wrapper.klass_tag(), | |
| 2202 0, // referrer_class_tag is 0 for heap root (stack) | |
| 2203 wrapper.obj_size(), | |
| 2204 wrapper.obj_tag_p(), | |
| 2205 NULL, // referrer_tag is 0 for root | |
| 2206 len, | |
| 2207 (void*)user_data()); | |
| 2208 | |
| 2209 if (res & JVMTI_VISIT_ABORT) { | |
| 2210 return false; | |
| 2211 } | |
| 2212 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2213 check_for_visit(obj); | |
| 2214 } | |
| 2215 return true; | |
| 2216 } | |
| 2217 | |
| 2218 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
| 2219 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
| 2220 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
| 2221 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
| 2222 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
| 2223 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
| 2224 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
| 2225 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
| 2226 | |
| 2227 // invoke the object reference callback to report a reference | |
| 2228 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2229 oop referrer, | |
| 2230 oop obj, | |
| 2231 jint index) | |
| 2232 { | |
| 2233 // field index is only valid field in reference_info | |
| 2234 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 2235 | |
| 2236 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
| 2237 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2238 | |
| 2239 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2240 | |
| 2241 // check that callback is provider | |
| 2242 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2243 if (cb == NULL) { | |
| 2244 return check_for_visit(obj); | |
| 2245 } | |
| 2246 | |
| 2247 // apply class filter | |
| 2248 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2249 return check_for_visit(obj); | |
| 2250 } | |
| 2251 | |
| 2252 // setup the callback wrapper | |
| 2253 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
| 2254 | |
| 2255 // apply tag filter | |
| 2256 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2257 wrapper.klass_tag(), | |
| 2258 context->heap_filter())) { | |
| 2259 return check_for_visit(obj); | |
| 2260 } | |
| 2261 | |
| 2262 // field index is only valid field in reference_info | |
| 2263 reference_info.field.index = index; | |
| 2264 | |
| 2265 // for arrays we need the length, otherwise -1 | |
| 2266 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2267 | |
| 2268 // invoke the callback | |
| 2269 int res = (*cb)(ref_kind, | |
| 2270 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
| 2271 wrapper.klass_tag(), | |
| 2272 wrapper.referrer_klass_tag(), | |
| 2273 wrapper.obj_size(), | |
| 2274 wrapper.obj_tag_p(), | |
| 2275 wrapper.referrer_tag_p(), | |
| 2276 len, | |
| 2277 (void*)user_data()); | |
| 2278 | |
| 2279 if (res & JVMTI_VISIT_ABORT) { | |
| 2280 return false; | |
| 2281 } | |
| 2282 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2283 check_for_visit(obj); | |
| 2284 } | |
| 2285 return true; | |
| 2286 } | |
| 2287 | |
| 2288 // report a "simple root" | |
| 2289 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
| 2290 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
| 2291 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
| 2292 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2293 | |
| 2294 if (is_basic_heap_walk()) { | |
| 2295 // map to old style root kind | |
| 2296 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
| 2297 return invoke_basic_heap_root_callback(root_kind, obj); | |
| 2298 } else { | |
| 2299 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
| 2300 return invoke_advanced_heap_root_callback(kind, obj); | |
| 2301 } | |
| 2302 } | |
| 2303 | |
| 2304 | |
| 2305 // invoke the primitive array values | |
| 2306 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
| 2307 assert(obj->is_typeArray(), "not a primitive array"); | |
| 2308 | |
| 2309 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2310 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
| 2311 | |
| 2312 // apply class filter | |
| 2313 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2314 return true; | |
| 2315 } | |
| 2316 | |
| 2317 CallbackWrapper wrapper(tag_map(), obj); | |
| 2318 | |
| 2319 // apply tag filter | |
| 2320 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2321 wrapper.klass_tag(), | |
| 2322 context->heap_filter())) { | |
| 2323 return true; | |
| 2324 } | |
| 2325 | |
| 2326 // invoke the callback | |
| 2327 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
| 2328 &wrapper, | |
| 2329 obj, | |
| 2330 (void*)user_data()); | |
| 2331 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2332 } | |
| 2333 | |
| 2334 // invoke the string value callback | |
| 2335 inline bool CallbackInvoker::report_string_value(oop str) { | |
| 1142 | 2336 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
| 0 | 2337 |
| 2338 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2339 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
| 2340 | |
| 2341 // apply class filter | |
| 2342 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
| 2343 return true; | |
| 2344 } | |
| 2345 | |
| 2346 CallbackWrapper wrapper(tag_map(), str); | |
| 2347 | |
| 2348 // apply tag filter | |
| 2349 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2350 wrapper.klass_tag(), | |
| 2351 context->heap_filter())) { | |
| 2352 return true; | |
| 2353 } | |
| 2354 | |
| 2355 // invoke the callback | |
| 2356 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
| 2357 &wrapper, | |
| 2358 str, | |
| 2359 (void*)user_data()); | |
| 2360 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2361 } | |
| 2362 | |
| 2363 // invoke the primitive field callback | |
| 2364 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
| 2365 oop obj, | |
| 2366 jint index, | |
| 2367 address addr, | |
| 2368 char type) | |
| 2369 { | |
| 2370 // for primitive fields only the index will be set | |
| 2371 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 2372 | |
| 2373 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2374 assert(context->primitive_field_callback() != NULL, "no callback"); | |
| 2375 | |
| 2376 // apply class filter | |
| 2377 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2378 return true; | |
| 2379 } | |
| 2380 | |
| 2381 CallbackWrapper wrapper(tag_map(), obj); | |
| 2382 | |
| 2383 // apply tag filter | |
| 2384 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2385 wrapper.klass_tag(), | |
| 2386 context->heap_filter())) { | |
| 2387 return true; | |
| 2388 } | |
| 2389 | |
| 2390 // the field index in the referrer | |
| 2391 reference_info.field.index = index; | |
| 2392 | |
| 2393 // map the type | |
| 2394 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 2395 | |
| 2396 // setup the jvalue | |
| 2397 jvalue value; | |
| 2398 copy_to_jvalue(&value, addr, value_type); | |
| 2399 | |
| 2400 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
| 2401 int res = (*cb)(ref_kind, | |
| 2402 &reference_info, | |
| 2403 wrapper.klass_tag(), | |
| 2404 wrapper.obj_tag_p(), | |
| 2405 value, | |
| 2406 value_type, | |
| 2407 (void*)user_data()); | |
| 2408 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2409 } | |
| 2410 | |
| 2411 | |
| 2412 // instance field | |
| 2413 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
| 2414 jint index, | |
| 2415 address value, | |
| 2416 char type) { | |
| 2417 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
| 2418 obj, | |
| 2419 index, | |
| 2420 value, | |
| 2421 type); | |
| 2422 } | |
| 2423 | |
| 2424 // static field | |
| 2425 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
| 2426 jint index, | |
| 2427 address value, | |
| 2428 char type) { | |
| 2429 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
| 2430 obj, | |
| 2431 index, | |
| 2432 value, | |
| 2433 type); | |
| 2434 } | |
| 2435 | |
| 2436 // report a JNI local (root object) to the profiler | |
| 2437 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
| 2438 if (is_basic_heap_walk()) { | |
| 2439 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
| 2440 thread_tag, | |
| 2441 depth, | |
| 2442 m, | |
| 2443 -1, | |
| 2444 obj); | |
| 2445 } else { | |
| 2446 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
| 2447 thread_tag, tid, | |
| 2448 depth, | |
| 2449 m, | |
| 2450 (jlocation)-1, | |
| 2451 -1, | |
| 2452 obj); | |
| 2453 } | |
| 2454 } | |
| 2455 | |
| 2456 | |
| 2457 // report a local (stack reference, root object) | |
| 2458 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
| 2459 jlong tid, | |
| 2460 jint depth, | |
| 2461 jmethodID method, | |
| 2462 jlocation bci, | |
| 2463 jint slot, | |
| 2464 oop obj) { | |
| 2465 if (is_basic_heap_walk()) { | |
| 2466 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
| 2467 thread_tag, | |
| 2468 depth, | |
| 2469 method, | |
| 2470 slot, | |
| 2471 obj); | |
| 2472 } else { | |
| 2473 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
| 2474 thread_tag, | |
| 2475 tid, | |
| 2476 depth, | |
| 2477 method, | |
| 2478 bci, | |
| 2479 slot, | |
| 2480 obj); | |
| 2481 } | |
| 2482 } | |
| 2483 | |
| 2484 // report an object referencing a class. | |
| 2485 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
| 2486 if (is_basic_heap_walk()) { | |
| 2487 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
| 2488 } else { | |
| 2489 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
| 2490 } | |
| 2491 } | |
| 2492 | |
| 2493 // report a class referencing its class loader. | |
| 2494 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
| 2495 if (is_basic_heap_walk()) { | |
| 2496 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
| 2497 } else { | |
| 2498 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
| 2499 } | |
| 2500 } | |
| 2501 | |
| 2502 // report a class referencing its signers. | |
| 2503 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
| 2504 if (is_basic_heap_walk()) { | |
| 2505 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
| 2506 } else { | |
| 2507 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
| 2508 } | |
| 2509 } | |
| 2510 | |
| 2511 // report a class referencing its protection domain.. | |
| 2512 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
| 2513 if (is_basic_heap_walk()) { | |
| 2514 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
| 2515 } else { | |
| 2516 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
| 2517 } | |
| 2518 } | |
| 2519 | |
| 2520 // report a class referencing its superclass. | |
| 2521 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
| 2522 if (is_basic_heap_walk()) { | |
| 2523 // Send this to be consistent with past implementation | |
| 2524 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
| 2525 } else { | |
| 2526 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); | |
| 2527 } | |
| 2528 } | |
| 2529 | |
| 2530 // report a class referencing one of its interfaces. | |
| 2531 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
| 2532 if (is_basic_heap_walk()) { | |
| 2533 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
| 2534 } else { | |
| 2535 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
| 2536 } | |
| 2537 } | |
| 2538 | |
| 2539 // report a class referencing one of its static fields. | |
| 2540 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
| 2541 if (is_basic_heap_walk()) { | |
| 2542 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
| 2543 } else { | |
| 2544 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
| 2545 } | |
| 2546 } | |
| 2547 | |
| 2548 // report an array referencing an element object | |
| 2549 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
| 2550 if (is_basic_heap_walk()) { | |
| 2551 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
| 2552 } else { | |
| 2553 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
| 2554 } | |
| 2555 } | |
| 2556 | |
| 2557 // report an object referencing an instance field object | |
| 2558 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
| 2559 if (is_basic_heap_walk()) { | |
| 2560 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
| 2561 } else { | |
| 2562 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
| 2563 } | |
| 2564 } | |
| 2565 | |
| 2566 // report an array referencing an element object | |
| 2567 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
| 2568 if (is_basic_heap_walk()) { | |
| 2569 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
| 2570 } else { | |
| 2571 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
| 2572 } | |
| 2573 } | |
| 2574 | |
| 2575 // A supporting closure used to process simple roots | |
| 2576 class SimpleRootsClosure : public OopClosure { | |
| 2577 private: | |
| 2578 jvmtiHeapReferenceKind _kind; | |
| 2579 bool _continue; | |
| 2580 | |
| 2581 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
| 2582 | |
| 2583 public: | |
| 2584 void set_kind(jvmtiHeapReferenceKind kind) { | |
| 2585 _kind = kind; | |
| 2586 _continue = true; | |
| 2587 } | |
| 2588 | |
| 2589 inline bool stopped() { | |
| 2590 return !_continue; | |
| 2591 } | |
| 2592 | |
| 2593 void do_oop(oop* obj_p) { | |
| 2594 // iteration has terminated | |
| 2595 if (stopped()) { | |
| 2596 return; | |
| 2597 } | |
| 2598 | |
| 2599 // ignore null or deleted handles | |
| 2600 oop o = *obj_p; | |
| 2601 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
| 2602 return; | |
| 2603 } | |
| 2604 | |
| 2605 jvmtiHeapReferenceKind kind = root_kind(); | |
| 2606 | |
| 2607 // many roots are Klasses so we use the java mirror | |
| 2608 if (o->is_klass()) { | |
| 2609 klassOop k = (klassOop)o; | |
| 2610 o = Klass::cast(k)->java_mirror(); | |
|
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2611 if (o == NULL) { |
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2612 // Classes without mirrors don't correspond to real Java |
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2613 // classes so just ignore them. |
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2614 return; |
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2615 } |
| 0 | 2616 } else { |
| 2617 | |
| 2618 // SystemDictionary::always_strong_oops_do reports the application | |
| 2619 // class loader as a root. We want this root to be reported as | |
| 2620 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
| 2621 if (o->is_instance() && root_kind() == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { | |
| 2622 kind = JVMTI_HEAP_REFERENCE_OTHER; | |
| 2623 } | |
| 2624 } | |
| 2625 | |
| 2626 // some objects are ignored - in the case of simple | |
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2627 // roots it's mostly Symbol*s that we are skipping |
| 0 | 2628 // here. |
| 2629 if (!ServiceUtil::visible_oop(o)) { | |
| 2630 return; | |
| 2631 } | |
| 2632 | |
| 2633 // invoke the callback | |
| 2634 _continue = CallbackInvoker::report_simple_root(kind, o); | |
| 2635 | |
| 2636 } | |
|
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2637 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| 0 | 2638 }; |
| 2639 | |
| 2640 // A supporting closure used to process JNI locals | |
| 2641 class JNILocalRootsClosure : public OopClosure { | |
| 2642 private: | |
| 2643 jlong _thread_tag; | |
| 2644 jlong _tid; | |
| 2645 jint _depth; | |
| 2646 jmethodID _method; | |
| 2647 bool _continue; | |
| 2648 public: | |
| 2649 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
| 2650 _thread_tag = thread_tag; | |
| 2651 _tid = tid; | |
| 2652 _depth = depth; | |
| 2653 _method = method; | |
| 2654 _continue = true; | |
| 2655 } | |
| 2656 | |
| 2657 inline bool stopped() { | |
| 2658 return !_continue; | |
| 2659 } | |
| 2660 | |
| 2661 void do_oop(oop* obj_p) { | |
| 2662 // iteration has terminated | |
| 2663 if (stopped()) { | |
| 2664 return; | |
| 2665 } | |
| 2666 | |
| 2667 // ignore null or deleted handles | |
| 2668 oop o = *obj_p; | |
| 2669 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
| 2670 return; | |
| 2671 } | |
| 2672 | |
| 2673 if (!ServiceUtil::visible_oop(o)) { | |
| 2674 return; | |
| 2675 } | |
| 2676 | |
| 2677 // invoke the callback | |
| 2678 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
| 2679 } | |
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2680 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| 0 | 2681 }; |
| 2682 | |
| 2683 | |
| 2684 // A VM operation to iterate over objects that are reachable from | |
| 2685 // a set of roots or an initial object. | |
| 2686 // | |
| 2687 // For VM_HeapWalkOperation the set of roots used is :- | |
| 2688 // | |
| 2689 // - All JNI global references | |
| 2690 // - All inflated monitors | |
| 2691 // - All classes loaded by the boot class loader (or all classes | |
| 2692 // in the event that class unloading is disabled) | |
| 2693 // - All java threads | |
| 2694 // - For each java thread then all locals and JNI local references | |
| 2695 // on the thread's execution stack | |
| 2696 // - All visible/explainable objects from Universes::oops_do | |
| 2697 // | |
| 2698 class VM_HeapWalkOperation: public VM_Operation { | |
| 2699 private: | |
| 2700 enum { | |
| 2701 initial_visit_stack_size = 4000 | |
| 2702 }; | |
| 2703 | |
| 2704 bool _is_advanced_heap_walk; // indicates FollowReferences | |
| 2705 JvmtiTagMap* _tag_map; | |
| 2706 Handle _initial_object; | |
| 2707 GrowableArray<oop>* _visit_stack; // the visit stack | |
| 2708 | |
| 2709 bool _collecting_heap_roots; // are we collecting roots | |
| 2710 bool _following_object_refs; // are we following object references | |
| 2711 | |
| 2712 bool _reporting_primitive_fields; // optional reporting | |
| 2713 bool _reporting_primitive_array_values; | |
| 2714 bool _reporting_string_values; | |
| 2715 | |
| 2716 GrowableArray<oop>* create_visit_stack() { | |
| 6197 | 2717 return new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(initial_visit_stack_size, true); |
| 0 | 2718 } |
| 2719 | |
| 2720 // accessors | |
| 2721 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
| 2722 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 2723 Handle initial_object() const { return _initial_object; } | |
| 2724 | |
| 2725 bool is_following_references() const { return _following_object_refs; } | |
| 2726 | |
| 2727 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
| 2728 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
| 2729 bool is_reporting_string_values() const { return _reporting_string_values; } | |
| 2730 | |
| 2731 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
| 2732 | |
| 2733 // iterate over the various object types | |
| 2734 inline bool iterate_over_array(oop o); | |
| 2735 inline bool iterate_over_type_array(oop o); | |
| 2736 inline bool iterate_over_class(klassOop o); | |
| 2737 inline bool iterate_over_object(oop o); | |
| 2738 | |
| 2739 // root collection | |
| 2740 inline bool collect_simple_roots(); | |
| 2741 inline bool collect_stack_roots(); | |
| 2742 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
| 2743 | |
| 2744 // visit an object | |
| 2745 inline bool visit(oop o); | |
| 2746 | |
| 2747 public: | |
| 2748 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2749 Handle initial_object, | |
| 2750 BasicHeapWalkContext callbacks, | |
| 2751 const void* user_data); | |
| 2752 | |
| 2753 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2754 Handle initial_object, | |
| 2755 AdvancedHeapWalkContext callbacks, | |
| 2756 const void* user_data); | |
| 2757 | |
| 2758 ~VM_HeapWalkOperation(); | |
| 2759 | |
| 2760 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
| 2761 void doit(); | |
| 2762 }; | |
| 2763 | |
| 2764 | |
| 2765 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2766 Handle initial_object, | |
| 2767 BasicHeapWalkContext callbacks, | |
| 2768 const void* user_data) { | |
| 2769 _is_advanced_heap_walk = false; | |
| 2770 _tag_map = tag_map; | |
| 2771 _initial_object = initial_object; | |
| 2772 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
| 2773 _reporting_primitive_fields = false; | |
| 2774 _reporting_primitive_array_values = false; | |
| 2775 _reporting_string_values = false; | |
| 2776 _visit_stack = create_visit_stack(); | |
| 2777 | |
| 2778 | |
| 2779 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
| 2780 } | |
| 2781 | |
| 2782 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2783 Handle initial_object, | |
| 2784 AdvancedHeapWalkContext callbacks, | |
| 2785 const void* user_data) { | |
| 2786 _is_advanced_heap_walk = true; | |
| 2787 _tag_map = tag_map; | |
| 2788 _initial_object = initial_object; | |
| 2789 _following_object_refs = true; | |
| 2790 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
| 2791 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
| 2792 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
| 2793 _visit_stack = create_visit_stack(); | |
| 2794 | |
| 2795 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
| 2796 } | |
| 2797 | |
| 2798 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
| 2799 if (_following_object_refs) { | |
| 2800 assert(_visit_stack != NULL, "checking"); | |
| 2801 delete _visit_stack; | |
| 2802 _visit_stack = NULL; | |
| 2803 } | |
| 2804 } | |
| 2805 | |
| 2806 // an array references its class and has a reference to | |
| 2807 // each element in the array | |
| 2808 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
| 2809 objArrayOop array = objArrayOop(o); | |
| 2810 if (array->klass() == Universe::systemObjArrayKlassObj()) { | |
| 2811 // filtered out | |
| 2812 return true; | |
| 2813 } | |
| 2814 | |
| 2815 // array reference to its class | |
| 2816 oop mirror = objArrayKlass::cast(array->klass())->java_mirror(); | |
| 2817 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
| 2818 return false; | |
| 2819 } | |
| 2820 | |
| 2821 // iterate over the array and report each reference to a | |
| 2822 // non-null element | |
| 2823 for (int index=0; index<array->length(); index++) { | |
| 2824 oop elem = array->obj_at(index); | |
| 2825 if (elem == NULL) { | |
| 2826 continue; | |
| 2827 } | |
| 2828 | |
| 2829 // report the array reference o[index] = elem | |
| 2830 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
| 2831 return false; | |
| 2832 } | |
| 2833 } | |
| 2834 return true; | |
| 2835 } | |
| 2836 | |
| 2837 // a type array references its class | |
| 2838 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
| 2839 klassOop k = o->klass(); | |
| 2840 oop mirror = Klass::cast(k)->java_mirror(); | |
| 2841 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
| 2842 return false; | |
| 2843 } | |
| 2844 | |
| 2845 // report the array contents if required | |
| 2846 if (is_reporting_primitive_array_values()) { | |
| 2847 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
| 2848 return false; | |
| 2849 } | |
| 2850 } | |
| 2851 return true; | |
| 2852 } | |
| 2853 | |
| 2854 // verify that a static oop field is in range | |
|
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2855 static inline bool verify_static_oop(instanceKlass* ik, |
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2856 oop mirror, int offset) { |
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2857 address obj_p = (address)mirror + offset; |
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2858 address start = (address)instanceMirrorKlass::start_of_static_fields(mirror); |
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2859 address end = start + (java_lang_Class::static_oop_field_count(mirror) * heapOopSize); |
| 0 | 2860 assert(end >= start, "sanity check"); |
| 2861 | |
| 2862 if (obj_p >= start && obj_p < end) { | |
| 2863 return true; | |
| 2864 } else { | |
| 2865 return false; | |
| 2866 } | |
| 2867 } | |
| 2868 | |
| 2869 // a class references its super class, interfaces, class loader, ... | |
| 2870 // and finally its static fields | |
| 2871 inline bool VM_HeapWalkOperation::iterate_over_class(klassOop k) { | |
| 2872 int i; | |
| 2873 Klass* klass = klassOop(k)->klass_part(); | |
| 2874 | |
| 2875 if (klass->oop_is_instance()) { | |
| 2876 instanceKlass* ik = instanceKlass::cast(k); | |
| 2877 | |
| 2878 // ignore the class if it's has been initialized yet | |
| 2879 if (!ik->is_linked()) { | |
| 2880 return true; | |
| 2881 } | |
| 2882 | |
| 2883 // get the java mirror | |
| 2884 oop mirror = klass->java_mirror(); | |
| 2885 | |
| 2886 // super (only if something more interesting than java.lang.Object) | |
| 2887 klassOop java_super = ik->java_super(); | |
| 1142 | 2888 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
| 0 | 2889 oop super = Klass::cast(java_super)->java_mirror(); |
| 2890 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { | |
| 2891 return false; | |
| 2892 } | |
| 2893 } | |
| 2894 | |
| 2895 // class loader | |
| 2896 oop cl = ik->class_loader(); | |
| 2897 if (cl != NULL) { | |
| 2898 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
| 2899 return false; | |
| 2900 } | |
| 2901 } | |
| 2902 | |
| 2903 // protection domain | |
| 2904 oop pd = ik->protection_domain(); | |
| 2905 if (pd != NULL) { | |
| 2906 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
| 2907 return false; | |
| 2908 } | |
| 2909 } | |
| 2910 | |
| 2911 // signers | |
| 2912 oop signers = ik->signers(); | |
| 2913 if (signers != NULL) { | |
| 2914 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
| 2915 return false; | |
| 2916 } | |
| 2917 } | |
| 2918 | |
| 2919 // references from the constant pool | |
| 2920 { | |
| 2921 const constantPoolOop pool = ik->constants(); | |
| 2922 for (int i = 1; i < pool->length(); i++) { | |
| 2923 constantTag tag = pool->tag_at(i).value(); | |
| 2924 if (tag.is_string() || tag.is_klass()) { | |
| 2925 oop entry; | |
| 2926 if (tag.is_string()) { | |
| 2927 entry = pool->resolved_string_at(i); | |
| 2928 assert(java_lang_String::is_instance(entry), "must be string"); | |
| 2929 } else { | |
| 2930 entry = Klass::cast(pool->resolved_klass_at(i))->java_mirror(); | |
| 2931 } | |
| 2932 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
| 2933 return false; | |
| 2934 } | |
| 2935 } | |
| 2936 } | |
| 2937 } | |
| 2938 | |
| 2939 // interfaces | |
| 2940 // (These will already have been reported as references from the constant pool | |
| 2941 // but are specified by IterateOverReachableObjects and must be reported). | |
| 2942 objArrayOop interfaces = ik->local_interfaces(); | |
| 2943 for (i = 0; i < interfaces->length(); i++) { | |
| 2944 oop interf = Klass::cast((klassOop)interfaces->obj_at(i))->java_mirror(); | |
| 2945 if (interf == NULL) { | |
| 2946 continue; | |
| 2947 } | |
| 2948 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
| 2949 return false; | |
| 2950 } | |
| 2951 } | |
| 2952 | |
| 2953 // iterate over the static fields | |
| 2954 | |
| 2955 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
| 2956 for (i=0; i<field_map->field_count(); i++) { | |
| 2957 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 2958 char type = field->field_type(); | |
| 2959 if (!is_primitive_field_type(type)) { | |
|
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7017732: move static fields into Class to prepare for perm gen removal
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2177
diff
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|
2960 oop fld_o = mirror->obj_field(field->field_offset()); |
|
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2177
diff
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|
2961 assert(verify_static_oop(ik, mirror, field->field_offset()), "sanity check"); |
| 0 | 2962 if (fld_o != NULL) { |
| 2963 int slot = field->field_index(); | |
| 2964 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
| 2965 delete field_map; | |
| 2966 return false; | |
| 2967 } | |
| 2968 } | |
| 2969 } else { | |
| 2970 if (is_reporting_primitive_fields()) { | |
|
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changeset
|
2971 address addr = (address)mirror + field->field_offset(); |
| 0 | 2972 int slot = field->field_index(); |
| 2973 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
| 2974 delete field_map; | |
| 2975 return false; | |
| 2976 } | |
| 2977 } | |
| 2978 } | |
| 2979 } | |
| 2980 delete field_map; | |
| 2981 | |
| 2982 return true; | |
| 2983 } | |
| 2984 | |
| 2985 return true; | |
| 2986 } | |
| 2987 | |
| 2988 // an object references a class and its instance fields | |
| 2989 // (static fields are ignored here as we report these as | |
| 2990 // references from the class). | |
| 2991 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
| 2992 // reference to the class | |
| 2993 if (!CallbackInvoker::report_class_reference(o, Klass::cast(o->klass())->java_mirror())) { | |
| 2994 return false; | |
| 2995 } | |
| 2996 | |
| 2997 // iterate over instance fields | |
| 2998 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
| 2999 for (int i=0; i<field_map->field_count(); i++) { | |
| 3000 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 3001 char type = field->field_type(); | |
| 3002 if (!is_primitive_field_type(type)) { | |
|
113
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
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diff
changeset
|
3003 oop fld_o = o->obj_field(field->field_offset()); |
|
4929
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7130993: nsk/jdi/ReferenceType/instances/instances004 fails with JFR: assert(ServiceUtil::visible_oop(obj))
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diff
changeset
|
3004 // ignore any objects that aren't visible to profiler |
|
2b150750d53d
7130993: nsk/jdi/ReferenceType/instances/instances004 fails with JFR: assert(ServiceUtil::visible_oop(obj))
sspitsyn
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3816
diff
changeset
|
3005 if (fld_o != NULL && ServiceUtil::visible_oop(fld_o)) { |
| 0 | 3006 // reflection code may have a reference to a klassOop. |
| 3007 // - see sun.reflect.UnsafeStaticFieldAccessorImpl and sun.misc.Unsafe | |
| 3008 if (fld_o->is_klass()) { | |
| 3009 klassOop k = (klassOop)fld_o; | |
| 3010 fld_o = Klass::cast(k)->java_mirror(); | |
| 3011 } | |
| 3012 int slot = field->field_index(); | |
| 3013 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
| 3014 return false; | |
| 3015 } | |
| 3016 } | |
| 3017 } else { | |
| 3018 if (is_reporting_primitive_fields()) { | |
| 3019 // primitive instance field | |
| 3020 address addr = (address)o + field->field_offset(); | |
| 3021 int slot = field->field_index(); | |
| 3022 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
| 3023 return false; | |
| 3024 } | |
| 3025 } | |
| 3026 } | |
| 3027 } | |
| 3028 | |
| 3029 // if the object is a java.lang.String | |
| 3030 if (is_reporting_string_values() && | |
| 1142 | 3031 o->klass() == SystemDictionary::String_klass()) { |
| 0 | 3032 if (!CallbackInvoker::report_string_value(o)) { |
| 3033 return false; | |
| 3034 } | |
| 3035 } | |
| 3036 return true; | |
| 3037 } | |
| 3038 | |
| 3039 | |
|
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6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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parents:
3815
diff
changeset
|
3040 // Collects all simple (non-stack) roots except for threads; |
|
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6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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parents:
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diff
changeset
|
3041 // threads are handled in collect_stack_roots() as an optimization. |
| 0 | 3042 // if there's a heap root callback provided then the callback is |
| 3043 // invoked for each simple root. | |
| 3044 // if an object reference callback is provided then all simple | |
| 3045 // roots are pushed onto the marking stack so that they can be | |
| 3046 // processed later | |
| 3047 // | |
| 3048 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
| 3049 SimpleRootsClosure blk; | |
| 3050 | |
| 3051 // JNI globals | |
| 3052 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
| 3053 JNIHandles::oops_do(&blk); | |
| 3054 if (blk.stopped()) { | |
| 3055 return false; | |
| 3056 } | |
| 3057 | |
| 3058 // Preloaded classes and loader from the system dictionary | |
| 3059 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
| 3060 SystemDictionary::always_strong_oops_do(&blk); | |
| 3061 if (blk.stopped()) { | |
| 3062 return false; | |
| 3063 } | |
| 3064 | |
| 3065 // Inflated monitors | |
| 3066 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
| 3067 ObjectSynchronizer::oops_do(&blk); | |
| 3068 if (blk.stopped()) { | |
| 3069 return false; | |
| 3070 } | |
| 3071 | |
|
3816
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6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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parents:
3815
diff
changeset
|
3072 // threads are now handled in collect_stack_roots() |
| 0 | 3073 |
| 3074 // Other kinds of roots maintained by HotSpot | |
| 3075 // Many of these won't be visible but others (such as instances of important | |
| 3076 // exceptions) will be visible. | |
| 3077 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
| 3078 Universe::oops_do(&blk); | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3079 |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3080 // If there are any non-perm roots in the code cache, visit them. |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3081 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3082 CodeBlobToOopClosure look_in_blobs(&blk, false); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3083 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3084 |
| 0 | 3085 return true; |
| 3086 } | |
| 3087 | |
| 3088 // Walk the stack of a given thread and find all references (locals | |
| 3089 // and JNI calls) and report these as stack references | |
| 3090 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
| 3091 JNILocalRootsClosure* blk) | |
| 3092 { | |
| 3093 oop threadObj = java_thread->threadObj(); | |
| 3094 assert(threadObj != NULL, "sanity check"); | |
| 3095 | |
| 3096 // only need to get the thread's tag once per thread | |
| 3097 jlong thread_tag = tag_for(_tag_map, threadObj); | |
| 3098 | |
| 3099 // also need the thread id | |
| 3100 jlong tid = java_lang_Thread::thread_id(threadObj); | |
| 3101 | |
| 3102 | |
| 3103 if (java_thread->has_last_Java_frame()) { | |
| 3104 | |
| 3105 // vframes are resource allocated | |
| 3106 Thread* current_thread = Thread::current(); | |
| 3107 ResourceMark rm(current_thread); | |
| 3108 HandleMark hm(current_thread); | |
| 3109 | |
| 3110 RegisterMap reg_map(java_thread); | |
| 3111 frame f = java_thread->last_frame(); | |
| 3112 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
| 3113 | |
| 3114 bool is_top_frame = true; | |
| 3115 int depth = 0; | |
| 3116 frame* last_entry_frame = NULL; | |
| 3117 | |
| 3118 while (vf != NULL) { | |
| 3119 if (vf->is_java_frame()) { | |
| 3120 | |
| 3121 // java frame (interpreted, compiled, ...) | |
| 3122 javaVFrame *jvf = javaVFrame::cast(vf); | |
| 3123 | |
| 3124 // the jmethodID | |
| 3125 jmethodID method = jvf->method()->jmethod_id(); | |
| 3126 | |
| 3127 if (!(jvf->method()->is_native())) { | |
| 3128 jlocation bci = (jlocation)jvf->bci(); | |
| 3129 StackValueCollection* locals = jvf->locals(); | |
| 3130 for (int slot=0; slot<locals->size(); slot++) { | |
| 3131 if (locals->at(slot)->type() == T_OBJECT) { | |
| 3132 oop o = locals->obj_at(slot)(); | |
| 3133 if (o == NULL) { | |
| 3134 continue; | |
| 3135 } | |
| 3136 | |
| 3137 // stack reference | |
| 3138 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
| 3139 bci, slot, o)) { | |
| 3140 return false; | |
| 3141 } | |
| 3142 } | |
| 3143 } | |
| 3144 } else { | |
| 3145 blk->set_context(thread_tag, tid, depth, method); | |
| 3146 if (is_top_frame) { | |
| 3147 // JNI locals for the top frame. | |
| 3148 java_thread->active_handles()->oops_do(blk); | |
| 3149 } else { | |
| 3150 if (last_entry_frame != NULL) { | |
| 3151 // JNI locals for the entry frame | |
| 3152 assert(last_entry_frame->is_entry_frame(), "checking"); | |
| 3153 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
| 3154 } | |
| 3155 } | |
| 3156 } | |
| 3157 last_entry_frame = NULL; | |
| 3158 depth++; | |
| 3159 } else { | |
| 3160 // externalVFrame - for an entry frame then we report the JNI locals | |
| 3161 // when we find the corresponding javaVFrame | |
| 3162 frame* fr = vf->frame_pointer(); | |
| 3163 assert(fr != NULL, "sanity check"); | |
| 3164 if (fr->is_entry_frame()) { | |
| 3165 last_entry_frame = fr; | |
| 3166 } | |
|
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
2377
diff
changeset
|
3167 if (fr->is_ricochet_frame()) { |
|
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
2377
diff
changeset
|
3168 fr->oops_ricochet_do(blk, vf->register_map()); |
|
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
2377
diff
changeset
|
3169 } |
| 0 | 3170 } |
| 3171 | |
| 3172 vf = vf->sender(); | |
| 3173 is_top_frame = false; | |
| 3174 } | |
| 3175 } else { | |
| 3176 // no last java frame but there may be JNI locals | |
| 3177 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
| 3178 java_thread->active_handles()->oops_do(blk); | |
| 3179 } | |
| 3180 return true; | |
| 3181 } | |
| 3182 | |
| 3183 | |
|
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3184 // Collects the simple roots for all threads and collects all |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3185 // stack roots - for each thread it walks the execution |
| 0 | 3186 // stack to find all references and local JNI refs. |
| 3187 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
| 3188 JNILocalRootsClosure blk; | |
| 3189 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
| 3190 oop threadObj = thread->threadObj(); | |
| 3191 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
|
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3192 // Collect the simple root for this thread before we |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3193 // collect its stack roots |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3194 if (!CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3195 threadObj)) { |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3196 return false; |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3197 } |
| 0 | 3198 if (!collect_stack_roots(thread, &blk)) { |
| 3199 return false; | |
| 3200 } | |
| 3201 } | |
| 3202 } | |
| 3203 return true; | |
| 3204 } | |
| 3205 | |
| 3206 // visit an object | |
| 3207 // first mark the object as visited | |
| 3208 // second get all the outbound references from this object (in other words, all | |
| 3209 // the objects referenced by this object). | |
| 3210 // | |
| 3211 bool VM_HeapWalkOperation::visit(oop o) { | |
| 3212 // mark object as visited | |
| 3213 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
| 3214 ObjectMarker::mark(o); | |
| 3215 | |
| 3216 // instance | |
| 3217 if (o->is_instance()) { | |
| 1142 | 3218 if (o->klass() == SystemDictionary::Class_klass()) { |
| 0 | 3219 o = klassOop_if_java_lang_Class(o); |
| 3220 if (o->is_klass()) { | |
| 3221 // a java.lang.Class | |
| 3222 return iterate_over_class(klassOop(o)); | |
| 3223 } | |
| 3224 } else { | |
| 3225 return iterate_over_object(o); | |
| 3226 } | |
| 3227 } | |
| 3228 | |
| 3229 // object array | |
| 3230 if (o->is_objArray()) { | |
| 3231 return iterate_over_array(o); | |
| 3232 } | |
| 3233 | |
| 3234 // type array | |
| 3235 if (o->is_typeArray()) { | |
| 3236 return iterate_over_type_array(o); | |
| 3237 } | |
| 3238 | |
| 3239 return true; | |
| 3240 } | |
| 3241 | |
| 3242 void VM_HeapWalkOperation::doit() { | |
| 3243 ResourceMark rm; | |
| 3244 ObjectMarkerController marker; | |
| 3245 ClassFieldMapCacheMark cm; | |
| 3246 | |
| 3247 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
| 3248 | |
| 3249 // the heap walk starts with an initial object or the heap roots | |
| 3250 if (initial_object().is_null()) { | |
| 3815 | 3251 // If either collect_stack_roots() or collect_simple_roots() |
| 3252 // returns false at this point, then there are no mark bits | |
| 3253 // to reset. | |
| 3254 ObjectMarker::set_needs_reset(false); | |
| 3255 | |
|
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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parents:
3815
diff
changeset
|
3256 // Calling collect_stack_roots() before collect_simple_roots() |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3257 // can result in a big performance boost for an agent that is |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3258 // focused on analyzing references in the thread stacks. |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3259 if (!collect_stack_roots()) return; |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3260 |
| 0 | 3261 if (!collect_simple_roots()) return; |
| 3815 | 3262 |
| 3263 // no early return so enable heap traversal to reset the mark bits | |
| 3264 ObjectMarker::set_needs_reset(true); | |
| 0 | 3265 } else { |
| 3266 visit_stack()->push(initial_object()()); | |
| 3267 } | |
| 3268 | |
| 3269 // object references required | |
| 3270 if (is_following_references()) { | |
| 3271 | |
| 3272 // visit each object until all reachable objects have been | |
| 3273 // visited or the callback asked to terminate the iteration. | |
| 3274 while (!visit_stack()->is_empty()) { | |
| 3275 oop o = visit_stack()->pop(); | |
| 3276 if (!ObjectMarker::visited(o)) { | |
| 3277 if (!visit(o)) { | |
| 3278 break; | |
| 3279 } | |
| 3280 } | |
| 3281 } | |
| 3282 } | |
| 3283 } | |
| 3284 | |
| 3285 // iterate over all objects that are reachable from a set of roots | |
| 3286 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
| 3287 jvmtiStackReferenceCallback stack_ref_callback, | |
| 3288 jvmtiObjectReferenceCallback object_ref_callback, | |
| 3289 const void* user_data) { | |
| 3290 MutexLocker ml(Heap_lock); | |
| 3291 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
| 3292 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
| 3293 VMThread::execute(&op); | |
| 3294 } | |
| 3295 | |
| 3296 // iterate over all objects that are reachable from a given object | |
| 3297 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
| 3298 jvmtiObjectReferenceCallback object_ref_callback, | |
| 3299 const void* user_data) { | |
| 3300 oop obj = JNIHandles::resolve(object); | |
| 3301 Handle initial_object(Thread::current(), obj); | |
| 3302 | |
| 3303 MutexLocker ml(Heap_lock); | |
| 3304 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
| 3305 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
| 3306 VMThread::execute(&op); | |
| 3307 } | |
| 3308 | |
| 3309 // follow references from an initial object or the GC roots | |
| 3310 void JvmtiTagMap::follow_references(jint heap_filter, | |
| 3311 KlassHandle klass, | |
| 3312 jobject object, | |
| 3313 const jvmtiHeapCallbacks* callbacks, | |
| 3314 const void* user_data) | |
| 3315 { | |
| 3316 oop obj = JNIHandles::resolve(object); | |
| 3317 Handle initial_object(Thread::current(), obj); | |
| 3318 | |
| 3319 MutexLocker ml(Heap_lock); | |
| 3320 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
| 3321 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
| 3322 VMThread::execute(&op); | |
| 3323 } | |
| 3324 | |
| 3325 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3326 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
|
3327 // 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
|
3328 // 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
|
3329 // 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
|
3330 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
|
3331 SafepointSynchronize::is_at_safepoint(), |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3332 "must be executed at a safepoint"); |
| 0 | 3333 if (JvmtiEnv::environments_might_exist()) { |
| 3334 JvmtiEnvIterator it; | |
| 3335 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
| 3336 JvmtiTagMap* tag_map = env->tag_map(); | |
| 3337 if (tag_map != NULL && !tag_map->is_empty()) { | |
|
2125
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parents:
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diff
changeset
|
3338 tag_map->do_weak_oops(is_alive, f); |
| 0 | 3339 } |
| 3340 } | |
| 3341 } | |
| 3342 } | |
| 3343 | |
|
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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1972
diff
changeset
|
3344 void JvmtiTagMap::do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f) { |
| 0 | 3345 |
| 3346 // does this environment have the OBJECT_FREE event enabled | |
| 3347 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
| 3348 | |
| 3349 // counters used for trace message | |
| 3350 int freed = 0; | |
| 3351 int moved = 0; | |
|
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3352 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3353 JvmtiTagHashmap* hashmap = this->hashmap(); |
| 0 | 3354 |
| 3355 // reenable sizing (if disabled) | |
|
2125
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diff
changeset
|
3356 hashmap->set_resizing_enabled(true); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3357 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3358 // 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
|
3359 if (hashmap->_entry_count == 0) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3360 return; |
| 0 | 3361 } |
| 3362 | |
|
2125
7246a374a9f2
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diff
changeset
|
3363 // now iterate through each entry in the table |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3364 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3365 JvmtiTagHashmapEntry** table = hashmap->table(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3366 int size = hashmap->size(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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1972
diff
changeset
|
3367 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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parents:
1972
diff
changeset
|
3368 JvmtiTagHashmapEntry* delayed_add = NULL; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3369 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3370 for (int pos = 0; pos < size; ++pos) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3371 JvmtiTagHashmapEntry* entry = table[pos]; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3372 JvmtiTagHashmapEntry* prev = NULL; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3373 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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1972
diff
changeset
|
3374 while (entry != NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3375 JvmtiTagHashmapEntry* next = entry->next(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3376 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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parents:
1972
diff
changeset
|
3377 oop* obj = entry->object_addr(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3378 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3379 // has object been GC'ed |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3380 if (!is_alive->do_object_b(entry->object())) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3381 // grab the tag |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3382 jlong tag = entry->tag(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3383 guarantee(tag != 0, "checking"); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3384 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3385 // remove GC'ed entry from hashmap and return the |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3386 // entry to the free list |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3387 hashmap->remove(prev, pos, entry); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3388 destroy_entry(entry); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3389 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3390 // post the event to the profiler |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3391 if (post_object_free) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3392 JvmtiExport::post_object_free(env(), tag); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3393 } |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3394 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3395 ++freed; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3396 } else { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3397 f->do_oop(entry->object_addr()); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3398 oop new_oop = entry->object(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3399 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3400 // 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
|
3401 // entry to its new location. |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3402 unsigned int new_pos = JvmtiTagHashmap::hash(new_oop, size); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3403 if (new_pos != (unsigned int)pos) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3404 if (prev == NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3405 table[pos] = next; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3406 } else { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3407 prev->set_next(next); |
| 0 | 3408 } |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3409 if (new_pos < (unsigned int)pos) { |
| 0 | 3410 entry->set_next(table[new_pos]); |
| 3411 table[new_pos] = entry; | |
| 3412 } else { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3413 // 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
|
3414 // hitting it again during this iteration. |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3415 entry->set_next(delayed_add); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3416 delayed_add = entry; |
| 0 | 3417 } |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3418 moved++; |
| 0 | 3419 } else { |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3420 // object didn't move |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3421 prev = entry; |
| 0 | 3422 } |
| 3423 } | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3424 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3425 entry = next; |
| 0 | 3426 } |
| 3427 } | |
| 3428 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3429 // Re-add all the entries which were kept aside |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3430 while (delayed_add != NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3431 JvmtiTagHashmapEntry* next = delayed_add->next(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3432 unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3433 delayed_add->set_next(table[pos]); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3434 table[pos] = delayed_add; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3435 delayed_add = next; |
| 0 | 3436 } |
| 3437 | |
| 3438 // stats | |
| 3439 if (TraceJVMTIObjectTagging) { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3440 int post_total = hashmap->_entry_count; |
| 0 | 3441 int pre_total = post_total + freed; |
| 3442 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3443 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
|
3444 pre_total, post_total, freed, moved); |
| 0 | 3445 } |
| 3446 } |