Mercurial > hg > graal-jvmci-8
annotate src/share/vm/prims/jvmtiTagMap.cpp @ 23286:dd9cc155639c
Merge with jdk8u66-b17
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Thu, 07 Jan 2016 17:28:46 +0100 |
| parents | 7848fc12602b 9686a796c829 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2013, 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" | |
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48 #include "utilities/macros.hpp" |
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49 #if INCLUDE_ALL_GCS |
| 1972 | 50 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
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51 #endif // INCLUDE_ALL_GCS |
| 0 | 52 |
| 53 // JvmtiTagHashmapEntry | |
| 54 // | |
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55 // Each entry encapsulates a reference to the tagged object |
| 0 | 56 // and the tag value. In addition an entry includes a next pointer which |
| 57 // is used to chain entries together. | |
| 58 | |
| 6197 | 59 class JvmtiTagHashmapEntry : public CHeapObj<mtInternal> { |
| 0 | 60 private: |
| 61 friend class JvmtiTagMap; | |
| 62 | |
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63 oop _object; // tagged object |
| 0 | 64 jlong _tag; // the tag |
| 65 JvmtiTagHashmapEntry* _next; // next on the list | |
| 66 | |
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67 inline void init(oop object, jlong tag) { |
| 0 | 68 _object = object; |
| 69 _tag = tag; | |
| 70 _next = NULL; | |
| 71 } | |
| 72 | |
| 73 // constructor | |
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74 JvmtiTagHashmapEntry(oop object, jlong tag) { init(object, tag); } |
| 0 | 75 |
| 76 public: | |
| 77 | |
| 78 // accessor methods | |
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79 inline oop object() const { return _object; } |
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80 inline oop* object_addr() { return &_object; } |
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81 inline jlong tag() const { return _tag; } |
| 0 | 82 |
| 83 inline void set_tag(jlong tag) { | |
| 84 assert(tag != 0, "can't be zero"); | |
| 85 _tag = tag; | |
| 86 } | |
| 87 | |
| 88 inline JvmtiTagHashmapEntry* next() const { return _next; } | |
| 89 inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; } | |
| 90 }; | |
| 91 | |
| 92 | |
| 93 // JvmtiTagHashmap | |
| 94 // | |
| 95 // A hashmap is essentially a table of pointers to entries. Entries | |
| 96 // are hashed to a location, or position in the table, and then | |
| 97 // chained from that location. The "key" for hashing is address of | |
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98 // the object, or oop. The "value" is the tag value. |
| 0 | 99 // |
| 100 // A hashmap maintains a count of the number entries in the hashmap | |
| 101 // and resizes if the number of entries exceeds a given threshold. | |
| 102 // The threshold is specified as a percentage of the size - for | |
| 103 // example a threshold of 0.75 will trigger the hashmap to resize | |
| 104 // if the number of entries is >75% of table size. | |
| 105 // | |
| 106 // A hashmap provides functions for adding, removing, and finding | |
| 107 // entries. It also provides a function to iterate over all entries | |
| 108 // in the hashmap. | |
| 109 | |
| 6197 | 110 class JvmtiTagHashmap : public CHeapObj<mtInternal> { |
| 0 | 111 private: |
| 112 friend class JvmtiTagMap; | |
| 113 | |
| 114 enum { | |
| 115 small_trace_threshold = 10000, // threshold for tracing | |
| 116 medium_trace_threshold = 100000, | |
| 117 large_trace_threshold = 1000000, | |
| 118 initial_trace_threshold = small_trace_threshold | |
| 119 }; | |
| 120 | |
| 121 static int _sizes[]; // array of possible hashmap sizes | |
| 122 int _size; // actual size of the table | |
| 123 int _size_index; // index into size table | |
| 124 | |
| 125 int _entry_count; // number of entries in the hashmap | |
| 126 | |
| 127 float _load_factor; // load factor as a % of the size | |
| 128 int _resize_threshold; // computed threshold to trigger resizing. | |
| 129 bool _resizing_enabled; // indicates if hashmap can resize | |
| 130 | |
| 131 int _trace_threshold; // threshold for trace messages | |
| 132 | |
| 133 JvmtiTagHashmapEntry** _table; // the table of entries. | |
| 134 | |
| 135 // private accessors | |
| 136 int resize_threshold() const { return _resize_threshold; } | |
| 137 int trace_threshold() const { return _trace_threshold; } | |
| 138 | |
| 139 // initialize the hashmap | |
| 140 void init(int size_index=0, float load_factor=4.0f) { | |
| 141 int initial_size = _sizes[size_index]; | |
| 142 _size_index = size_index; | |
| 143 _size = initial_size; | |
| 144 _entry_count = 0; | |
| 145 if (TraceJVMTIObjectTagging) { | |
| 146 _trace_threshold = initial_trace_threshold; | |
| 147 } else { | |
| 148 _trace_threshold = -1; | |
| 149 } | |
| 150 _load_factor = load_factor; | |
| 151 _resize_threshold = (int)(_load_factor * _size); | |
| 152 _resizing_enabled = true; | |
| 153 size_t s = initial_size * sizeof(JvmtiTagHashmapEntry*); | |
| 6197 | 154 _table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
| 0 | 155 if (_table == NULL) { |
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156 vm_exit_out_of_memory(s, OOM_MALLOC_ERROR, |
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157 "unable to allocate initial hashtable for jvmti object tags"); |
| 0 | 158 } |
| 159 for (int i=0; i<initial_size; i++) { | |
| 160 _table[i] = NULL; | |
| 161 } | |
| 162 } | |
| 163 | |
| 164 // hash a given key (oop) with the specified size | |
| 165 static unsigned int hash(oop key, int size) { | |
| 166 // shift right to get better distribution (as these bits will be zero | |
| 167 // with aligned addresses) | |
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168 unsigned int addr = (unsigned int)(cast_from_oop<intptr_t>(key)); |
| 0 | 169 #ifdef _LP64 |
| 170 return (addr >> 3) % size; | |
| 171 #else | |
| 172 return (addr >> 2) % size; | |
| 173 #endif | |
| 174 } | |
| 175 | |
| 176 // hash a given key (oop) | |
| 177 unsigned int hash(oop key) { | |
| 178 return hash(key, _size); | |
| 179 } | |
| 180 | |
| 181 // resize the hashmap - allocates a large table and re-hashes | |
| 182 // all entries into the new table. | |
| 183 void resize() { | |
| 184 int new_size_index = _size_index+1; | |
| 185 int new_size = _sizes[new_size_index]; | |
| 186 if (new_size < 0) { | |
| 187 // hashmap already at maximum capacity | |
| 188 return; | |
| 189 } | |
| 190 | |
| 191 // allocate new table | |
| 192 size_t s = new_size * sizeof(JvmtiTagHashmapEntry*); | |
| 6197 | 193 JvmtiTagHashmapEntry** new_table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
| 0 | 194 if (new_table == NULL) { |
| 195 warning("unable to allocate larger hashtable for jvmti object tags"); | |
| 196 set_resizing_enabled(false); | |
| 197 return; | |
| 198 } | |
| 199 | |
| 200 // initialize new table | |
| 201 int i; | |
| 202 for (i=0; i<new_size; i++) { | |
| 203 new_table[i] = NULL; | |
| 204 } | |
| 205 | |
| 206 // rehash all entries into the new table | |
| 207 for (i=0; i<_size; i++) { | |
| 208 JvmtiTagHashmapEntry* entry = _table[i]; | |
| 209 while (entry != NULL) { | |
| 210 JvmtiTagHashmapEntry* next = entry->next(); | |
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211 oop key = entry->object(); |
| 0 | 212 assert(key != NULL, "jni weak reference cleared!!"); |
| 213 unsigned int h = hash(key, new_size); | |
| 214 JvmtiTagHashmapEntry* anchor = new_table[h]; | |
| 215 if (anchor == NULL) { | |
| 216 new_table[h] = entry; | |
| 217 entry->set_next(NULL); | |
| 218 } else { | |
| 219 entry->set_next(anchor); | |
| 220 new_table[h] = entry; | |
| 221 } | |
| 222 entry = next; | |
| 223 } | |
| 224 } | |
| 225 | |
| 226 // free old table and update settings. | |
| 227 os::free((void*)_table); | |
| 228 _table = new_table; | |
| 229 _size_index = new_size_index; | |
| 230 _size = new_size; | |
| 231 | |
| 232 // compute new resize threshold | |
| 233 _resize_threshold = (int)(_load_factor * _size); | |
| 234 } | |
| 235 | |
| 236 | |
| 237 // internal remove function - remove an entry at a given position in the | |
| 238 // table. | |
| 239 inline void remove(JvmtiTagHashmapEntry* prev, int pos, JvmtiTagHashmapEntry* entry) { | |
| 240 assert(pos >= 0 && pos < _size, "out of range"); | |
| 241 if (prev == NULL) { | |
| 242 _table[pos] = entry->next(); | |
| 243 } else { | |
| 244 prev->set_next(entry->next()); | |
| 245 } | |
| 246 assert(_entry_count > 0, "checking"); | |
| 247 _entry_count--; | |
| 248 } | |
| 249 | |
| 250 // resizing switch | |
| 251 bool is_resizing_enabled() const { return _resizing_enabled; } | |
| 252 void set_resizing_enabled(bool enable) { _resizing_enabled = enable; } | |
| 253 | |
| 254 // debugging | |
| 255 void print_memory_usage(); | |
| 256 void compute_next_trace_threshold(); | |
| 257 | |
| 258 public: | |
| 259 | |
| 260 // create a JvmtiTagHashmap of a preferred size and optionally a load factor. | |
| 261 // The preferred size is rounded down to an actual size. | |
| 262 JvmtiTagHashmap(int size, float load_factor=0.0f) { | |
| 263 int i=0; | |
| 264 while (_sizes[i] < size) { | |
| 265 if (_sizes[i] < 0) { | |
| 266 assert(i > 0, "sanity check"); | |
| 267 i--; | |
| 268 break; | |
| 269 } | |
| 270 i++; | |
| 271 } | |
| 272 | |
| 273 // if a load factor is specified then use it, otherwise use default | |
| 274 if (load_factor > 0.01f) { | |
| 275 init(i, load_factor); | |
| 276 } else { | |
| 277 init(i); | |
| 278 } | |
| 279 } | |
| 280 | |
| 281 // create a JvmtiTagHashmap with default settings | |
| 282 JvmtiTagHashmap() { | |
| 283 init(); | |
| 284 } | |
| 285 | |
| 286 // release table when JvmtiTagHashmap destroyed | |
| 287 ~JvmtiTagHashmap() { | |
| 288 if (_table != NULL) { | |
| 289 os::free((void*)_table); | |
| 290 _table = NULL; | |
| 291 } | |
| 292 } | |
| 293 | |
| 294 // accessors | |
| 295 int size() const { return _size; } | |
| 296 JvmtiTagHashmapEntry** table() const { return _table; } | |
| 297 int entry_count() const { return _entry_count; } | |
| 298 | |
| 299 // find an entry in the hashmap, returns NULL if not found. | |
| 300 inline JvmtiTagHashmapEntry* find(oop key) { | |
| 301 unsigned int h = hash(key); | |
| 302 JvmtiTagHashmapEntry* entry = _table[h]; | |
| 303 while (entry != NULL) { | |
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304 if (entry->object() == key) { |
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305 return entry; |
| 0 | 306 } |
| 307 entry = entry->next(); | |
| 308 } | |
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309 return NULL; |
| 0 | 310 } |
| 311 | |
| 312 | |
| 313 // add a new entry to hashmap | |
| 314 inline void add(oop key, JvmtiTagHashmapEntry* entry) { | |
| 315 assert(key != NULL, "checking"); | |
| 316 assert(find(key) == NULL, "duplicate detected"); | |
| 317 unsigned int h = hash(key); | |
| 318 JvmtiTagHashmapEntry* anchor = _table[h]; | |
| 319 if (anchor == NULL) { | |
| 320 _table[h] = entry; | |
| 321 entry->set_next(NULL); | |
| 322 } else { | |
| 323 entry->set_next(anchor); | |
| 324 _table[h] = entry; | |
| 325 } | |
| 326 | |
| 327 _entry_count++; | |
| 328 if (trace_threshold() > 0 && entry_count() >= trace_threshold()) { | |
| 329 assert(TraceJVMTIObjectTagging, "should only get here when tracing"); | |
| 330 print_memory_usage(); | |
| 331 compute_next_trace_threshold(); | |
| 332 } | |
| 333 | |
| 334 // if the number of entries exceed the threshold then resize | |
| 335 if (entry_count() > resize_threshold() && is_resizing_enabled()) { | |
| 336 resize(); | |
| 337 } | |
| 338 } | |
| 339 | |
| 340 // remove an entry with the given key. | |
| 341 inline JvmtiTagHashmapEntry* remove(oop key) { | |
| 342 unsigned int h = hash(key); | |
| 343 JvmtiTagHashmapEntry* entry = _table[h]; | |
| 344 JvmtiTagHashmapEntry* prev = NULL; | |
| 345 while (entry != NULL) { | |
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346 if (key == entry->object()) { |
| 0 | 347 break; |
| 348 } | |
| 349 prev = entry; | |
| 350 entry = entry->next(); | |
| 351 } | |
| 352 if (entry != NULL) { | |
| 353 remove(prev, h, entry); | |
| 354 } | |
| 355 return entry; | |
| 356 } | |
| 357 | |
| 358 // iterate over all entries in the hashmap | |
| 359 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); | |
| 360 }; | |
| 361 | |
| 362 // possible hashmap sizes - odd primes that roughly double in size. | |
| 363 // To avoid excessive resizing the odd primes from 4801-76831 and | |
| 364 // 76831-307261 have been removed. The list must be terminated by -1. | |
| 365 int JvmtiTagHashmap::_sizes[] = { 4801, 76831, 307261, 614563, 1228891, | |
| 366 2457733, 4915219, 9830479, 19660831, 39321619, 78643219, -1 }; | |
| 367 | |
| 368 | |
| 369 // A supporting class for iterating over all entries in Hashmap | |
| 370 class JvmtiTagHashmapEntryClosure { | |
| 371 public: | |
| 372 virtual void do_entry(JvmtiTagHashmapEntry* entry) = 0; | |
| 373 }; | |
| 374 | |
| 375 | |
| 376 // iterate over all entries in the hashmap | |
| 377 void JvmtiTagHashmap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
| 378 for (int i=0; i<_size; i++) { | |
| 379 JvmtiTagHashmapEntry* entry = _table[i]; | |
| 380 JvmtiTagHashmapEntry* prev = NULL; | |
| 381 while (entry != NULL) { | |
| 382 // obtain the next entry before invoking do_entry - this is | |
| 383 // necessary because do_entry may remove the entry from the | |
| 384 // hashmap. | |
| 385 JvmtiTagHashmapEntry* next = entry->next(); | |
| 386 closure->do_entry(entry); | |
| 387 entry = next; | |
| 388 } | |
| 389 } | |
| 390 } | |
| 391 | |
| 392 // debugging | |
| 393 void JvmtiTagHashmap::print_memory_usage() { | |
| 394 intptr_t p = (intptr_t)this; | |
| 395 tty->print("[JvmtiTagHashmap @ " INTPTR_FORMAT, p); | |
| 396 | |
| 397 // table + entries in KB | |
| 398 int hashmap_usage = (size()*sizeof(JvmtiTagHashmapEntry*) + | |
| 399 entry_count()*sizeof(JvmtiTagHashmapEntry))/K; | |
| 400 | |
| 401 int weak_globals_usage = (int)(JNIHandles::weak_global_handle_memory_usage()/K); | |
| 402 tty->print_cr(", %d entries (%d KB) <JNI weak globals: %d KB>]", | |
| 403 entry_count(), hashmap_usage, weak_globals_usage); | |
| 404 } | |
| 405 | |
| 406 // compute threshold for the next trace message | |
| 407 void JvmtiTagHashmap::compute_next_trace_threshold() { | |
| 408 if (trace_threshold() < medium_trace_threshold) { | |
| 409 _trace_threshold += small_trace_threshold; | |
| 410 } else { | |
| 411 if (trace_threshold() < large_trace_threshold) { | |
| 412 _trace_threshold += medium_trace_threshold; | |
| 413 } else { | |
| 414 _trace_threshold += large_trace_threshold; | |
| 415 } | |
| 416 } | |
| 417 } | |
| 418 | |
| 419 // create a JvmtiTagMap | |
| 420 JvmtiTagMap::JvmtiTagMap(JvmtiEnv* env) : | |
| 421 _env(env), | |
| 422 _lock(Mutex::nonleaf+2, "JvmtiTagMap._lock", false), | |
| 423 _free_entries(NULL), | |
| 424 _free_entries_count(0) | |
| 425 { | |
| 426 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 427 assert(((JvmtiEnvBase *)env)->tag_map() == NULL, "tag map already exists for environment"); | |
| 428 | |
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429 _hashmap = new JvmtiTagHashmap(); |
| 0 | 430 |
| 431 // finally add us to the environment | |
| 432 ((JvmtiEnvBase *)env)->set_tag_map(this); | |
| 433 } | |
| 434 | |
| 435 | |
| 436 // destroy a JvmtiTagMap | |
| 437 JvmtiTagMap::~JvmtiTagMap() { | |
| 438 | |
| 439 // no lock acquired as we assume the enclosing environment is | |
| 440 // also being destroryed. | |
| 441 ((JvmtiEnvBase *)_env)->set_tag_map(NULL); | |
| 442 | |
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443 JvmtiTagHashmapEntry** table = _hashmap->table(); |
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444 for (int j = 0; j < _hashmap->size(); j++) { |
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445 JvmtiTagHashmapEntry* entry = table[j]; |
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446 while (entry != NULL) { |
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447 JvmtiTagHashmapEntry* next = entry->next(); |
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448 delete entry; |
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449 entry = next; |
| 0 | 450 } |
| 451 } | |
| 452 | |
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453 // finally destroy the hashmap |
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454 delete _hashmap; |
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455 _hashmap = NULL; |
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456 |
| 0 | 457 // remove any entries on the free list |
| 458 JvmtiTagHashmapEntry* entry = _free_entries; | |
| 459 while (entry != NULL) { | |
| 460 JvmtiTagHashmapEntry* next = entry->next(); | |
| 461 delete entry; | |
| 462 entry = next; | |
| 463 } | |
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464 _free_entries = NULL; |
| 0 | 465 } |
| 466 | |
| 467 // create a hashmap entry | |
| 468 // - if there's an entry on the (per-environment) free list then this | |
| 469 // is returned. Otherwise an new entry is allocated. | |
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470 JvmtiTagHashmapEntry* JvmtiTagMap::create_entry(oop ref, jlong tag) { |
| 0 | 471 assert(Thread::current()->is_VM_thread() || is_locked(), "checking"); |
| 472 JvmtiTagHashmapEntry* entry; | |
| 473 if (_free_entries == NULL) { | |
| 474 entry = new JvmtiTagHashmapEntry(ref, tag); | |
| 475 } else { | |
| 476 assert(_free_entries_count > 0, "mismatched _free_entries_count"); | |
| 477 _free_entries_count--; | |
| 478 entry = _free_entries; | |
| 479 _free_entries = entry->next(); | |
| 480 entry->init(ref, tag); | |
| 481 } | |
| 482 return entry; | |
| 483 } | |
| 484 | |
| 485 // destroy an entry by returning it to the free list | |
| 486 void JvmtiTagMap::destroy_entry(JvmtiTagHashmapEntry* entry) { | |
| 487 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
| 488 // limit the size of the free list | |
| 489 if (_free_entries_count >= max_free_entries) { | |
| 490 delete entry; | |
| 491 } else { | |
| 492 entry->set_next(_free_entries); | |
| 493 _free_entries = entry; | |
| 494 _free_entries_count++; | |
| 495 } | |
| 496 } | |
| 497 | |
| 498 // returns the tag map for the given environments. If the tag map | |
| 499 // doesn't exist then it is created. | |
| 500 JvmtiTagMap* JvmtiTagMap::tag_map_for(JvmtiEnv* env) { | |
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501 JvmtiTagMap* tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
| 0 | 502 if (tag_map == NULL) { |
| 503 MutexLocker mu(JvmtiThreadState_lock); | |
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504 tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
| 0 | 505 if (tag_map == NULL) { |
| 506 tag_map = new JvmtiTagMap(env); | |
| 507 } | |
| 508 } else { | |
| 509 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
| 510 } | |
| 511 return tag_map; | |
| 512 } | |
| 513 | |
| 514 // iterate over all entries in the tag map. | |
| 515 void JvmtiTagMap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
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516 hashmap()->entry_iterate(closure); |
| 0 | 517 } |
| 518 | |
| 519 // returns true if the hashmaps are empty | |
| 520 bool JvmtiTagMap::is_empty() { | |
| 521 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
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522 return hashmap()->entry_count() == 0; |
| 0 | 523 } |
| 524 | |
| 525 | |
| 526 // Return the tag value for an object, or 0 if the object is | |
| 527 // not tagged | |
| 528 // | |
| 529 static inline jlong tag_for(JvmtiTagMap* tag_map, oop o) { | |
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530 JvmtiTagHashmapEntry* entry = tag_map->hashmap()->find(o); |
| 0 | 531 if (entry == NULL) { |
| 532 return 0; | |
| 533 } else { | |
| 534 return entry->tag(); | |
| 535 } | |
| 536 } | |
| 537 | |
| 538 | |
| 539 // A CallbackWrapper is a support class for querying and tagging an object | |
| 540 // around a callback to a profiler. The constructor does pre-callback | |
| 541 // work to get the tag value, klass tag value, ... and the destructor | |
| 542 // does the post-callback work of tagging or untagging the object. | |
| 543 // | |
| 544 // { | |
| 545 // CallbackWrapper wrapper(tag_map, o); | |
| 546 // | |
| 547 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
| 548 // | |
| 549 // } // wrapper goes out of scope here which results in the destructor | |
| 550 // checking to see if the object has been tagged, untagged, or the | |
| 551 // tag value has changed. | |
| 552 // | |
| 553 class CallbackWrapper : public StackObj { | |
| 554 private: | |
| 555 JvmtiTagMap* _tag_map; | |
| 556 JvmtiTagHashmap* _hashmap; | |
| 557 JvmtiTagHashmapEntry* _entry; | |
| 558 oop _o; | |
| 559 jlong _obj_size; | |
| 560 jlong _obj_tag; | |
| 561 jlong _klass_tag; | |
| 562 | |
| 563 protected: | |
| 564 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 565 | |
| 566 // invoked post-callback to tag, untag, or update the tag of an object | |
| 567 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
| 568 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
| 569 public: | |
| 570 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
| 571 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
| 572 "MT unsafe or must be VM thread"); | |
| 573 | |
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574 // object to tag |
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575 _o = o; |
| 0 | 576 |
| 577 // object size | |
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578 _obj_size = (jlong)_o->size() * wordSize; |
| 0 | 579 |
| 580 // record the context | |
| 581 _tag_map = tag_map; | |
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582 _hashmap = tag_map->hashmap(); |
| 0 | 583 _entry = _hashmap->find(_o); |
| 584 | |
| 585 // get object tag | |
| 586 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
| 587 | |
| 588 // get the class and the class's tag value | |
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589 assert(SystemDictionary::Class_klass()->oop_is_instanceMirror(), "Is not?"); |
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590 |
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591 _klass_tag = tag_for(tag_map, _o->klass()->java_mirror()); |
| 0 | 592 } |
| 593 | |
| 594 ~CallbackWrapper() { | |
| 595 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
| 596 } | |
| 597 | |
| 598 inline jlong* obj_tag_p() { return &_obj_tag; } | |
| 599 inline jlong obj_size() const { return _obj_size; } | |
| 600 inline jlong obj_tag() const { return _obj_tag; } | |
| 601 inline jlong klass_tag() const { return _klass_tag; } | |
| 602 }; | |
| 603 | |
| 604 | |
| 605 | |
| 606 // callback post-callback to tag, untag, or update the tag of an object | |
| 607 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
| 608 JvmtiTagHashmap* hashmap, | |
| 609 JvmtiTagHashmapEntry* entry, | |
| 610 jlong obj_tag) { | |
| 611 if (entry == NULL) { | |
| 612 if (obj_tag != 0) { | |
| 613 // callback has tagged the object | |
| 614 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
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615 entry = tag_map()->create_entry(o, obj_tag); |
| 0 | 616 hashmap->add(o, entry); |
| 617 } | |
| 618 } else { | |
| 619 // object was previously tagged - the callback may have untagged | |
| 620 // the object or changed the tag value | |
| 621 if (obj_tag == 0) { | |
| 622 | |
| 623 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
| 624 assert(entry_removed == entry, "checking"); | |
| 625 tag_map()->destroy_entry(entry); | |
| 626 | |
| 627 } else { | |
| 628 if (obj_tag != entry->tag()) { | |
| 629 entry->set_tag(obj_tag); | |
| 630 } | |
| 631 } | |
| 632 } | |
| 633 } | |
| 634 | |
| 635 // An extended CallbackWrapper used when reporting an object reference | |
| 636 // to the agent. | |
| 637 // | |
| 638 // { | |
| 639 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
| 640 // | |
| 641 // (*callback)(wrapper.klass_tag(), | |
| 642 // wrapper.obj_size(), | |
| 643 // wrapper.obj_tag_p() | |
| 644 // wrapper.referrer_tag_p(), ...) | |
| 645 // | |
| 646 // } // wrapper goes out of scope here which results in the destructor | |
| 647 // checking to see if the referrer object has been tagged, untagged, | |
| 648 // or the tag value has changed. | |
| 649 // | |
| 650 class TwoOopCallbackWrapper : public CallbackWrapper { | |
| 651 private: | |
| 652 bool _is_reference_to_self; | |
| 653 JvmtiTagHashmap* _referrer_hashmap; | |
| 654 JvmtiTagHashmapEntry* _referrer_entry; | |
| 655 oop _referrer; | |
| 656 jlong _referrer_obj_tag; | |
| 657 jlong _referrer_klass_tag; | |
| 658 jlong* _referrer_tag_p; | |
| 659 | |
| 660 bool is_reference_to_self() const { return _is_reference_to_self; } | |
| 661 | |
| 662 public: | |
| 663 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
| 664 CallbackWrapper(tag_map, o) | |
| 665 { | |
| 666 // self reference needs to be handled in a special way | |
| 667 _is_reference_to_self = (referrer == o); | |
| 668 | |
| 669 if (_is_reference_to_self) { | |
| 670 _referrer_klass_tag = klass_tag(); | |
| 671 _referrer_tag_p = obj_tag_p(); | |
| 672 } else { | |
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673 _referrer = referrer; |
| 0 | 674 // record the context |
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675 _referrer_hashmap = tag_map->hashmap(); |
| 0 | 676 _referrer_entry = _referrer_hashmap->find(_referrer); |
| 677 | |
| 678 // get object tag | |
| 679 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
| 680 _referrer_tag_p = &_referrer_obj_tag; | |
| 681 | |
| 682 // get referrer class tag. | |
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683 _referrer_klass_tag = tag_for(tag_map, _referrer->klass()->java_mirror()); |
| 0 | 684 } |
| 685 } | |
| 686 | |
| 687 ~TwoOopCallbackWrapper() { | |
| 688 if (!is_reference_to_self()){ | |
| 689 post_callback_tag_update(_referrer, | |
| 690 _referrer_hashmap, | |
| 691 _referrer_entry, | |
| 692 _referrer_obj_tag); | |
| 693 } | |
| 694 } | |
| 695 | |
| 696 // address of referrer tag | |
| 697 // (for a self reference this will return the same thing as obj_tag_p()) | |
| 698 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
| 699 | |
| 700 // referrer's class tag | |
| 701 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
| 702 }; | |
| 703 | |
| 704 // tag an object | |
| 705 // | |
| 706 // This function is performance critical. If many threads attempt to tag objects | |
| 707 // around the same time then it's possible that the Mutex associated with the | |
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708 // tag map will be a hot lock. |
| 0 | 709 void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
| 710 MutexLocker ml(lock()); | |
| 711 | |
| 712 // resolve the object | |
| 713 oop o = JNIHandles::resolve_non_null(object); | |
| 714 | |
| 715 // see if the object is already tagged | |
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716 JvmtiTagHashmap* hashmap = _hashmap; |
| 0 | 717 JvmtiTagHashmapEntry* entry = hashmap->find(o); |
| 718 | |
| 719 // if the object is not already tagged then we tag it | |
| 720 if (entry == NULL) { | |
| 721 if (tag != 0) { | |
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722 entry = create_entry(o, tag); |
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723 hashmap->add(o, entry); |
| 0 | 724 } else { |
| 725 // no-op | |
| 726 } | |
| 727 } else { | |
| 728 // if the object is already tagged then we either update | |
| 729 // the tag (if a new tag value has been provided) | |
| 730 // or remove the object if the new tag value is 0. | |
| 731 if (tag == 0) { | |
| 732 hashmap->remove(o); | |
| 733 destroy_entry(entry); | |
| 734 } else { | |
| 735 entry->set_tag(tag); | |
| 736 } | |
| 737 } | |
| 738 } | |
| 739 | |
| 740 // get the tag for an object | |
| 741 jlong JvmtiTagMap::get_tag(jobject object) { | |
| 742 MutexLocker ml(lock()); | |
| 743 | |
| 744 // resolve the object | |
| 745 oop o = JNIHandles::resolve_non_null(object); | |
| 746 | |
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747 return tag_for(this, o); |
| 0 | 748 } |
| 749 | |
| 750 | |
| 751 // Helper class used to describe the static or instance fields of a class. | |
| 752 // For each field it holds the field index (as defined by the JVMTI specification), | |
| 753 // the field type, and the offset. | |
| 754 | |
| 6197 | 755 class ClassFieldDescriptor: public CHeapObj<mtInternal> { |
| 0 | 756 private: |
| 757 int _field_index; | |
| 758 int _field_offset; | |
| 759 char _field_type; | |
| 760 public: | |
| 761 ClassFieldDescriptor(int index, char type, int offset) : | |
| 762 _field_index(index), _field_type(type), _field_offset(offset) { | |
| 763 } | |
| 764 int field_index() const { return _field_index; } | |
| 765 char field_type() const { return _field_type; } | |
| 766 int field_offset() const { return _field_offset; } | |
| 767 }; | |
| 768 | |
| 6197 | 769 class ClassFieldMap: public CHeapObj<mtInternal> { |
| 0 | 770 private: |
| 771 enum { | |
| 772 initial_field_count = 5 | |
| 773 }; | |
| 774 | |
| 775 // list of field descriptors | |
| 776 GrowableArray<ClassFieldDescriptor*>* _fields; | |
| 777 | |
| 778 // constructor | |
| 779 ClassFieldMap(); | |
| 780 | |
| 781 // add a field | |
| 782 void add(int index, char type, int offset); | |
| 783 | |
| 784 // returns the field count for the given class | |
| 785 static int compute_field_count(instanceKlassHandle ikh); | |
| 786 | |
| 787 public: | |
| 788 ~ClassFieldMap(); | |
| 789 | |
| 790 // access | |
| 791 int field_count() { return _fields->length(); } | |
| 792 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
| 793 | |
| 794 // functions to create maps of static or instance fields | |
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795 static ClassFieldMap* create_map_of_static_fields(Klass* k); |
| 0 | 796 static ClassFieldMap* create_map_of_instance_fields(oop obj); |
| 797 }; | |
| 798 | |
| 799 ClassFieldMap::ClassFieldMap() { | |
| 6197 | 800 _fields = new (ResourceObj::C_HEAP, mtInternal) |
| 801 GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
| 0 | 802 } |
| 803 | |
| 804 ClassFieldMap::~ClassFieldMap() { | |
| 805 for (int i=0; i<_fields->length(); i++) { | |
| 806 delete _fields->at(i); | |
| 807 } | |
| 808 delete _fields; | |
| 809 } | |
| 810 | |
| 811 void ClassFieldMap::add(int index, char type, int offset) { | |
| 812 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
| 813 _fields->append(field); | |
| 814 } | |
| 815 | |
| 816 // Returns a heap allocated ClassFieldMap to describe the static fields | |
| 817 // of the given class. | |
| 818 // | |
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819 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(Klass* k) { |
| 0 | 820 HandleMark hm; |
| 821 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
| 822 | |
| 823 // create the field map | |
| 824 ClassFieldMap* field_map = new ClassFieldMap(); | |
| 825 | |
| 826 FilteredFieldStream f(ikh, false, false); | |
| 827 int max_field_index = f.field_count()-1; | |
| 828 | |
| 829 int index = 0; | |
| 830 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
| 831 // ignore instance fields | |
| 832 if (!fld.access_flags().is_static()) { | |
| 833 continue; | |
| 834 } | |
| 835 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
| 836 } | |
| 837 return field_map; | |
| 838 } | |
| 839 | |
| 840 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
| 841 // of the given class. All instance fields are included (this means public | |
| 842 // and private fields declared in superclasses and superinterfaces too). | |
| 843 // | |
| 844 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
| 845 HandleMark hm; | |
| 846 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
| 847 | |
| 848 // create the field map | |
| 849 ClassFieldMap* field_map = new ClassFieldMap(); | |
| 850 | |
| 851 FilteredFieldStream f(ikh, false, false); | |
| 852 | |
| 853 int max_field_index = f.field_count()-1; | |
| 854 | |
| 855 int index = 0; | |
| 856 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
| 857 // ignore static fields | |
| 858 if (fld.access_flags().is_static()) { | |
| 859 continue; | |
| 860 } | |
| 861 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
| 862 } | |
| 863 | |
| 864 return field_map; | |
| 865 } | |
| 866 | |
| 867 // Helper class used to cache a ClassFileMap for the instance fields of | |
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868 // a cache. A JvmtiCachedClassFieldMap can be cached by an InstanceKlass during |
| 0 | 869 // heap iteration and avoid creating a field map for each object in the heap |
| 870 // (only need to create the map when the first instance of a class is encountered). | |
| 871 // | |
| 6197 | 872 class JvmtiCachedClassFieldMap : public CHeapObj<mtInternal> { |
| 0 | 873 private: |
| 874 enum { | |
| 875 initial_class_count = 200 | |
| 876 }; | |
| 877 ClassFieldMap* _field_map; | |
| 878 | |
| 879 ClassFieldMap* field_map() const { return _field_map; } | |
| 880 | |
| 881 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
| 882 ~JvmtiCachedClassFieldMap(); | |
| 883 | |
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884 static GrowableArray<InstanceKlass*>* _class_list; |
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885 static void add_to_class_list(InstanceKlass* ik); |
| 0 | 886 |
| 887 public: | |
| 888 // returns the field map for a given object (returning map cached | |
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889 // by InstanceKlass if possible |
| 0 | 890 static ClassFieldMap* get_map_of_instance_fields(oop obj); |
| 891 | |
| 892 // removes the field map from all instanceKlasses - should be | |
| 893 // called before VM operation completes | |
| 894 static void clear_cache(); | |
| 895 | |
| 896 // returns the number of ClassFieldMap cached by instanceKlasses | |
| 897 static int cached_field_map_count(); | |
| 898 }; | |
| 899 | |
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900 GrowableArray<InstanceKlass*>* JvmtiCachedClassFieldMap::_class_list; |
| 0 | 901 |
| 902 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
| 903 _field_map = field_map; | |
| 904 } | |
| 905 | |
| 906 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
| 907 if (_field_map != NULL) { | |
| 908 delete _field_map; | |
| 909 } | |
| 910 } | |
| 911 | |
| 912 // Marker class to ensure that the class file map cache is only used in a defined | |
| 913 // scope. | |
| 914 class ClassFieldMapCacheMark : public StackObj { | |
| 915 private: | |
| 916 static bool _is_active; | |
| 917 public: | |
| 918 ClassFieldMapCacheMark() { | |
| 919 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 920 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
| 921 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
| 922 _is_active = true; | |
| 923 } | |
| 924 ~ClassFieldMapCacheMark() { | |
| 925 JvmtiCachedClassFieldMap::clear_cache(); | |
| 926 _is_active = false; | |
| 927 } | |
| 928 static bool is_active() { return _is_active; } | |
| 929 }; | |
| 930 | |
| 931 bool ClassFieldMapCacheMark::_is_active; | |
| 932 | |
| 933 | |
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934 // record that the given InstanceKlass is caching a field map |
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935 void JvmtiCachedClassFieldMap::add_to_class_list(InstanceKlass* ik) { |
| 0 | 936 if (_class_list == NULL) { |
| 6197 | 937 _class_list = new (ResourceObj::C_HEAP, mtInternal) |
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938 GrowableArray<InstanceKlass*>(initial_class_count, true); |
| 0 | 939 } |
| 940 _class_list->push(ik); | |
| 941 } | |
| 942 | |
| 943 // returns the instance field map for the given object | |
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944 // (returns field map cached by the InstanceKlass if possible) |
| 0 | 945 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { |
| 946 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 947 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
| 948 | |
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949 Klass* k = obj->klass(); |
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950 InstanceKlass* ik = InstanceKlass::cast(k); |
| 0 | 951 |
| 952 // return cached map if possible | |
| 953 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
| 954 if (cached_map != NULL) { | |
| 955 assert(cached_map->field_map() != NULL, "missing field list"); | |
| 956 return cached_map->field_map(); | |
| 957 } else { | |
| 958 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
| 959 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
| 960 ik->set_jvmti_cached_class_field_map(cached_map); | |
| 961 add_to_class_list(ik); | |
| 962 return field_map; | |
| 963 } | |
| 964 } | |
| 965 | |
| 966 // remove the fields maps cached from all instanceKlasses | |
| 967 void JvmtiCachedClassFieldMap::clear_cache() { | |
| 968 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 969 if (_class_list != NULL) { | |
| 970 for (int i = 0; i < _class_list->length(); i++) { | |
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971 InstanceKlass* ik = _class_list->at(i); |
| 0 | 972 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); |
| 973 assert(cached_map != NULL, "should not be NULL"); | |
| 974 ik->set_jvmti_cached_class_field_map(NULL); | |
| 975 delete cached_map; // deletes the encapsulated field map | |
| 976 } | |
| 977 delete _class_list; | |
| 978 _class_list = NULL; | |
| 979 } | |
| 980 } | |
| 981 | |
| 982 // returns the number of ClassFieldMap cached by instanceKlasses | |
| 983 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
| 984 return (_class_list == NULL) ? 0 : _class_list->length(); | |
| 985 } | |
| 986 | |
| 987 // helper function to indicate if an object is filtered by its tag or class tag | |
| 988 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
| 989 jlong klass_tag, | |
| 990 int heap_filter) { | |
| 991 // apply the heap filter | |
| 992 if (obj_tag != 0) { | |
| 993 // filter out tagged objects | |
| 994 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
| 995 } else { | |
| 996 // filter out untagged objects | |
| 997 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
| 998 } | |
| 999 if (klass_tag != 0) { | |
| 1000 // filter out objects with tagged classes | |
| 1001 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
| 1002 } else { | |
| 1003 // filter out objects with untagged classes. | |
| 1004 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
| 1005 } | |
| 1006 return false; | |
| 1007 } | |
| 1008 | |
| 1009 // helper function to indicate if an object is filtered by a klass filter | |
| 1010 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
| 1011 if (!klass_filter.is_null()) { | |
| 1012 if (obj->klass() != klass_filter()) { | |
| 1013 return true; | |
| 1014 } | |
| 1015 } | |
| 1016 return false; | |
| 1017 } | |
| 1018 | |
| 1019 // helper function to tell if a field is a primitive field or not | |
| 1020 static inline bool is_primitive_field_type(char type) { | |
| 1021 return (type != 'L' && type != '['); | |
| 1022 } | |
| 1023 | |
| 1024 // helper function to copy the value from location addr to jvalue. | |
| 1025 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
| 1026 switch (value_type) { | |
| 1027 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
| 1028 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
| 1029 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
| 1030 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
| 1031 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
| 1032 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
| 1033 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
| 1034 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
| 1035 default: ShouldNotReachHere(); | |
| 1036 } | |
| 1037 } | |
| 1038 | |
| 1039 // helper function to invoke string primitive value callback | |
| 1040 // returns visit control flags | |
| 1041 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
| 1042 CallbackWrapper* wrapper, | |
| 1043 oop str, | |
| 1044 void* user_data) | |
| 1045 { | |
| 1142 | 1046 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
| 0 | 1047 |
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1048 typeArrayOop s_value = java_lang_String::value(str); |
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1049 |
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1050 // JDK-6584008: the value field may be null if a String instance is |
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1051 // partially constructed. |
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1052 if (s_value == NULL) { |
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1053 return 0; |
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1054 } |
| 0 | 1055 // get the string value and length |
| 1056 // (string value may be offset from the base) | |
| 1057 int s_len = java_lang_String::length(str); | |
| 1058 int s_offset = java_lang_String::offset(str); | |
| 1059 jchar* value; | |
| 1060 if (s_len > 0) { | |
| 1061 value = s_value->char_at_addr(s_offset); | |
| 1062 } else { | |
| 1063 value = (jchar*) s_value->base(T_CHAR); | |
| 1064 } | |
| 1065 | |
| 1066 // invoke the callback | |
| 1067 return (*cb)(wrapper->klass_tag(), | |
| 1068 wrapper->obj_size(), | |
| 1069 wrapper->obj_tag_p(), | |
| 1070 value, | |
| 1071 (jint)s_len, | |
| 1072 user_data); | |
| 1073 } | |
| 1074 | |
| 1075 // helper function to invoke string primitive value callback | |
| 1076 // returns visit control flags | |
| 1077 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
| 1078 CallbackWrapper* wrapper, | |
| 1079 oop obj, | |
| 1080 void* user_data) | |
| 1081 { | |
| 1082 assert(obj->is_typeArray(), "not a primitive array"); | |
| 1083 | |
| 1084 // get base address of first element | |
| 1085 typeArrayOop array = typeArrayOop(obj); | |
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1086 BasicType type = TypeArrayKlass::cast(array->klass())->element_type(); |
| 0 | 1087 void* elements = array->base(type); |
| 1088 | |
| 1089 // jvmtiPrimitiveType is defined so this mapping is always correct | |
| 1090 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
| 1091 | |
| 1092 return (*cb)(wrapper->klass_tag(), | |
| 1093 wrapper->obj_size(), | |
| 1094 wrapper->obj_tag_p(), | |
| 1095 (jint)array->length(), | |
| 1096 elem_type, | |
| 1097 elements, | |
| 1098 user_data); | |
| 1099 } | |
| 1100 | |
| 1101 // helper function to invoke the primitive field callback for all static fields | |
| 1102 // of a given class | |
| 1103 static jint invoke_primitive_field_callback_for_static_fields | |
| 1104 (CallbackWrapper* wrapper, | |
| 1105 oop obj, | |
| 1106 jvmtiPrimitiveFieldCallback cb, | |
| 1107 void* user_data) | |
| 1108 { | |
| 1109 // for static fields only the index will be set | |
| 1110 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 1111 | |
| 1142 | 1112 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
| 0 | 1113 if (java_lang_Class::is_primitive(obj)) { |
| 1114 return 0; | |
| 1115 } | |
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1116 Klass* klass = java_lang_Class::as_Klass(obj); |
| 0 | 1117 |
| 1118 // ignore classes for object and type arrays | |
| 1119 if (!klass->oop_is_instance()) { | |
| 1120 return 0; | |
| 1121 } | |
| 1122 | |
| 1123 // ignore classes which aren't linked yet | |
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1124 InstanceKlass* ik = InstanceKlass::cast(klass); |
| 0 | 1125 if (!ik->is_linked()) { |
| 1126 return 0; | |
| 1127 } | |
| 1128 | |
| 1129 // get the field map | |
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1130 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
| 0 | 1131 |
| 1132 // invoke the callback for each static primitive field | |
| 1133 for (int i=0; i<field_map->field_count(); i++) { | |
| 1134 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 1135 | |
| 1136 // ignore non-primitive fields | |
| 1137 char type = field->field_type(); | |
| 1138 if (!is_primitive_field_type(type)) { | |
| 1139 continue; | |
| 1140 } | |
| 1141 // one-to-one mapping | |
| 1142 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 1143 | |
| 1144 // get offset and field value | |
| 1145 int offset = field->field_offset(); | |
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1146 address addr = (address)klass->java_mirror() + offset; |
| 0 | 1147 jvalue value; |
| 1148 copy_to_jvalue(&value, addr, value_type); | |
| 1149 | |
| 1150 // field index | |
| 1151 reference_info.field.index = field->field_index(); | |
| 1152 | |
| 1153 // invoke the callback | |
| 1154 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
| 1155 &reference_info, | |
| 1156 wrapper->klass_tag(), | |
| 1157 wrapper->obj_tag_p(), | |
| 1158 value, | |
| 1159 value_type, | |
| 1160 user_data); | |
| 1161 if (res & JVMTI_VISIT_ABORT) { | |
| 1162 delete field_map; | |
| 1163 return res; | |
| 1164 } | |
| 1165 } | |
| 1166 | |
| 1167 delete field_map; | |
| 1168 return 0; | |
| 1169 } | |
| 1170 | |
| 1171 // helper function to invoke the primitive field callback for all instance fields | |
| 1172 // of a given object | |
| 1173 static jint invoke_primitive_field_callback_for_instance_fields( | |
| 1174 CallbackWrapper* wrapper, | |
| 1175 oop obj, | |
| 1176 jvmtiPrimitiveFieldCallback cb, | |
| 1177 void* user_data) | |
| 1178 { | |
| 1179 // for instance fields only the index will be set | |
| 1180 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 1181 | |
| 1182 // get the map of the instance fields | |
| 1183 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
| 1184 | |
| 1185 // invoke the callback for each instance primitive field | |
| 1186 for (int i=0; i<fields->field_count(); i++) { | |
| 1187 ClassFieldDescriptor* field = fields->field_at(i); | |
| 1188 | |
| 1189 // ignore non-primitive fields | |
| 1190 char type = field->field_type(); | |
| 1191 if (!is_primitive_field_type(type)) { | |
| 1192 continue; | |
| 1193 } | |
| 1194 // one-to-one mapping | |
| 1195 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 1196 | |
| 1197 // get offset and field value | |
| 1198 int offset = field->field_offset(); | |
| 1199 address addr = (address)obj + offset; | |
| 1200 jvalue value; | |
| 1201 copy_to_jvalue(&value, addr, value_type); | |
| 1202 | |
| 1203 // field index | |
| 1204 reference_info.field.index = field->field_index(); | |
| 1205 | |
| 1206 // invoke the callback | |
| 1207 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
| 1208 &reference_info, | |
| 1209 wrapper->klass_tag(), | |
| 1210 wrapper->obj_tag_p(), | |
| 1211 value, | |
| 1212 value_type, | |
| 1213 user_data); | |
| 1214 if (res & JVMTI_VISIT_ABORT) { | |
| 1215 return res; | |
| 1216 } | |
| 1217 } | |
| 1218 return 0; | |
| 1219 } | |
| 1220 | |
| 1221 | |
| 1222 // VM operation to iterate over all objects in the heap (both reachable | |
| 1223 // and unreachable) | |
| 1224 class VM_HeapIterateOperation: public VM_Operation { | |
| 1225 private: | |
| 1226 ObjectClosure* _blk; | |
| 1227 public: | |
| 1228 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
| 1229 | |
| 1230 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
| 1231 void doit() { | |
| 1232 // allows class files maps to be cached during iteration | |
| 1233 ClassFieldMapCacheMark cm; | |
| 1234 | |
| 1235 // make sure that heap is parsable (fills TLABs with filler objects) | |
| 1236 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
| 1237 | |
| 1238 // Verify heap before iteration - if the heap gets corrupted then | |
| 1239 // JVMTI's IterateOverHeap will crash. | |
| 1240 if (VerifyBeforeIteration) { | |
| 1241 Universe::verify(); | |
| 1242 } | |
| 1243 | |
| 1244 // do the iteration | |
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1245 // If this operation encounters a bad object when using CMS, |
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1246 // consider using safe_object_iterate() which avoids perm gen |
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1247 // objects that may contain bad references. |
| 0 | 1248 Universe::heap()->object_iterate(_blk); |
| 1249 } | |
| 1250 | |
| 1251 }; | |
| 1252 | |
| 1253 | |
| 1254 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
| 1255 // IterateOverInstancesOfClass functions | |
| 1256 class IterateOverHeapObjectClosure: public ObjectClosure { | |
| 1257 private: | |
| 1258 JvmtiTagMap* _tag_map; | |
| 1259 KlassHandle _klass; | |
| 1260 jvmtiHeapObjectFilter _object_filter; | |
| 1261 jvmtiHeapObjectCallback _heap_object_callback; | |
| 1262 const void* _user_data; | |
| 1263 | |
| 1264 // accessors | |
| 1265 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 1266 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
| 1267 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
| 1268 KlassHandle klass() const { return _klass; } | |
| 1269 const void* user_data() const { return _user_data; } | |
| 1270 | |
| 1271 // indicates if iteration has been aborted | |
| 1272 bool _iteration_aborted; | |
| 1273 bool is_iteration_aborted() const { return _iteration_aborted; } | |
| 1274 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
| 1275 | |
| 1276 public: | |
| 1277 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
| 1278 KlassHandle klass, | |
| 1279 jvmtiHeapObjectFilter object_filter, | |
| 1280 jvmtiHeapObjectCallback heap_object_callback, | |
| 1281 const void* user_data) : | |
| 1282 _tag_map(tag_map), | |
| 1283 _klass(klass), | |
| 1284 _object_filter(object_filter), | |
| 1285 _heap_object_callback(heap_object_callback), | |
| 1286 _user_data(user_data), | |
| 1287 _iteration_aborted(false) | |
| 1288 { | |
| 1289 } | |
| 1290 | |
| 1291 void do_object(oop o); | |
| 1292 }; | |
| 1293 | |
| 1294 // invoked for each object in the heap | |
| 1295 void IterateOverHeapObjectClosure::do_object(oop o) { | |
| 1296 // check if iteration has been halted | |
| 1297 if (is_iteration_aborted()) return; | |
| 1298 | |
| 1299 // ignore any objects that aren't visible to profiler | |
| 1300 if (!ServiceUtil::visible_oop(o)) return; | |
| 1301 | |
| 1302 // instanceof check when filtering by klass | |
| 1303 if (!klass().is_null() && !o->is_a(klass()())) { | |
| 1304 return; | |
| 1305 } | |
| 1306 // prepare for the calllback | |
| 1307 CallbackWrapper wrapper(tag_map(), o); | |
| 1308 | |
| 1309 // if the object is tagged and we're only interested in untagged objects | |
| 1310 // then don't invoke the callback. Similiarly, if the object is untagged | |
| 1311 // and we're only interested in tagged objects we skip the callback. | |
| 1312 if (wrapper.obj_tag() != 0) { | |
| 1313 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
| 1314 } else { | |
| 1315 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
| 1316 } | |
| 1317 | |
| 1318 // invoke the agent's callback | |
| 1319 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
| 1320 wrapper.obj_size(), | |
| 1321 wrapper.obj_tag_p(), | |
| 1322 (void*)user_data()); | |
| 1323 if (control == JVMTI_ITERATION_ABORT) { | |
| 1324 set_iteration_aborted(true); | |
| 1325 } | |
| 1326 } | |
| 1327 | |
| 1328 // An ObjectClosure used to support the IterateThroughHeap function | |
| 1329 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
| 1330 private: | |
| 1331 JvmtiTagMap* _tag_map; | |
| 1332 KlassHandle _klass; | |
| 1333 int _heap_filter; | |
| 1334 const jvmtiHeapCallbacks* _callbacks; | |
| 1335 const void* _user_data; | |
| 1336 | |
| 1337 // accessor functions | |
| 1338 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 1339 int heap_filter() const { return _heap_filter; } | |
| 1340 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
| 1341 KlassHandle klass() const { return _klass; } | |
| 1342 const void* user_data() const { return _user_data; } | |
| 1343 | |
| 1344 // indicates if the iteration has been aborted | |
| 1345 bool _iteration_aborted; | |
| 1346 bool is_iteration_aborted() const { return _iteration_aborted; } | |
| 1347 | |
| 1348 // used to check the visit control flags. If the abort flag is set | |
| 1349 // then we set the iteration aborted flag so that the iteration completes | |
| 1350 // without processing any further objects | |
| 1351 bool check_flags_for_abort(jint flags) { | |
| 1352 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
| 1353 if (is_abort) { | |
| 1354 _iteration_aborted = true; | |
| 1355 } | |
| 1356 return is_abort; | |
| 1357 } | |
| 1358 | |
| 1359 public: | |
| 1360 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
| 1361 KlassHandle klass, | |
| 1362 int heap_filter, | |
| 1363 const jvmtiHeapCallbacks* heap_callbacks, | |
| 1364 const void* user_data) : | |
| 1365 _tag_map(tag_map), | |
| 1366 _klass(klass), | |
| 1367 _heap_filter(heap_filter), | |
| 1368 _callbacks(heap_callbacks), | |
| 1369 _user_data(user_data), | |
| 1370 _iteration_aborted(false) | |
| 1371 { | |
| 1372 } | |
| 1373 | |
| 1374 void do_object(oop o); | |
| 1375 }; | |
| 1376 | |
| 1377 // invoked for each object in the heap | |
| 1378 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
| 1379 // check if iteration has been halted | |
| 1380 if (is_iteration_aborted()) return; | |
| 1381 | |
| 1382 // ignore any objects that aren't visible to profiler | |
| 1383 if (!ServiceUtil::visible_oop(obj)) return; | |
| 1384 | |
| 1385 // apply class filter | |
| 1386 if (is_filtered_by_klass_filter(obj, klass())) return; | |
| 1387 | |
| 1388 // prepare for callback | |
| 1389 CallbackWrapper wrapper(tag_map(), obj); | |
| 1390 | |
| 1391 // check if filtered by the heap filter | |
| 1392 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
| 1393 return; | |
| 1394 } | |
| 1395 | |
| 1396 // for arrays we need the length, otherwise -1 | |
| 1397 bool is_array = obj->is_array(); | |
| 1398 int len = is_array ? arrayOop(obj)->length() : -1; | |
| 1399 | |
| 1400 // invoke the object callback (if callback is provided) | |
| 1401 if (callbacks()->heap_iteration_callback != NULL) { | |
| 1402 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
| 1403 jint res = (*cb)(wrapper.klass_tag(), | |
| 1404 wrapper.obj_size(), | |
| 1405 wrapper.obj_tag_p(), | |
| 1406 (jint)len, | |
| 1407 (void*)user_data()); | |
| 1408 if (check_flags_for_abort(res)) return; | |
| 1409 } | |
| 1410 | |
| 1411 // for objects and classes we report primitive fields if callback provided | |
| 1412 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
| 1413 jint res; | |
| 1414 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
| 1142 | 1415 if (obj->klass() == SystemDictionary::Class_klass()) { |
| 0 | 1416 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
| 1417 obj, | |
| 1418 cb, | |
| 1419 (void*)user_data()); | |
| 1420 } else { | |
| 1421 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
| 1422 obj, | |
| 1423 cb, | |
| 1424 (void*)user_data()); | |
| 1425 } | |
| 1426 if (check_flags_for_abort(res)) return; | |
| 1427 } | |
| 1428 | |
| 1429 // string callback | |
| 1430 if (!is_array && | |
| 1431 callbacks()->string_primitive_value_callback != NULL && | |
| 1142 | 1432 obj->klass() == SystemDictionary::String_klass()) { |
| 0 | 1433 jint res = invoke_string_value_callback( |
| 1434 callbacks()->string_primitive_value_callback, | |
| 1435 &wrapper, | |
| 1436 obj, | |
| 1437 (void*)user_data() ); | |
| 1438 if (check_flags_for_abort(res)) return; | |
| 1439 } | |
| 1440 | |
| 1441 // array callback | |
| 1442 if (is_array && | |
| 1443 callbacks()->array_primitive_value_callback != NULL && | |
| 1444 obj->is_typeArray()) { | |
| 1445 jint res = invoke_array_primitive_value_callback( | |
| 1446 callbacks()->array_primitive_value_callback, | |
| 1447 &wrapper, | |
| 1448 obj, | |
| 1449 (void*)user_data() ); | |
| 1450 if (check_flags_for_abort(res)) return; | |
| 1451 } | |
| 1452 }; | |
| 1453 | |
| 1454 | |
| 1455 // Deprecated function to iterate over all objects in the heap | |
| 1456 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
| 1457 KlassHandle klass, | |
| 1458 jvmtiHeapObjectCallback heap_object_callback, | |
| 1459 const void* user_data) | |
| 1460 { | |
| 1461 MutexLocker ml(Heap_lock); | |
| 1462 IterateOverHeapObjectClosure blk(this, | |
| 1463 klass, | |
| 1464 object_filter, | |
| 1465 heap_object_callback, | |
| 1466 user_data); | |
| 1467 VM_HeapIterateOperation op(&blk); | |
| 1468 VMThread::execute(&op); | |
| 1469 } | |
| 1470 | |
| 1471 | |
| 1472 // Iterates over all objects in the heap | |
| 1473 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
| 1474 KlassHandle klass, | |
| 1475 const jvmtiHeapCallbacks* callbacks, | |
| 1476 const void* user_data) | |
| 1477 { | |
| 1478 MutexLocker ml(Heap_lock); | |
| 1479 IterateThroughHeapObjectClosure blk(this, | |
| 1480 klass, | |
| 1481 heap_filter, | |
| 1482 callbacks, | |
| 1483 user_data); | |
| 1484 VM_HeapIterateOperation op(&blk); | |
| 1485 VMThread::execute(&op); | |
| 1486 } | |
| 1487 | |
| 1488 // support class for get_objects_with_tags | |
| 1489 | |
| 1490 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
| 1491 private: | |
| 1492 JvmtiEnv* _env; | |
| 1493 jlong* _tags; | |
| 1494 jint _tag_count; | |
| 1495 | |
| 1496 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
| 1497 GrowableArray<uint64_t>* _tag_results; // collected tags | |
| 1498 | |
| 1499 public: | |
| 1500 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
| 1501 _env = env; | |
| 1502 _tags = (jlong*)tags; | |
| 1503 _tag_count = tag_count; | |
| 6197 | 1504 _object_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jobject>(1,true); |
| 1505 _tag_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<uint64_t>(1,true); | |
| 0 | 1506 } |
| 1507 | |
| 1508 ~TagObjectCollector() { | |
| 1509 delete _object_results; | |
| 1510 delete _tag_results; | |
| 1511 } | |
| 1512 | |
| 1513 // for each tagged object check if the tag value matches | |
| 1514 // - if it matches then we create a JNI local reference to the object | |
| 1515 // and record the reference and tag value. | |
| 1516 // | |
| 1517 void do_entry(JvmtiTagHashmapEntry* entry) { | |
| 1518 for (int i=0; i<_tag_count; i++) { | |
| 1519 if (_tags[i] == entry->tag()) { | |
|
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1520 oop o = entry->object(); |
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1521 assert(o != NULL && Universe::heap()->is_in_reserved(o), "sanity check"); |
| 0 | 1522 jobject ref = JNIHandles::make_local(JavaThread::current(), o); |
| 1523 _object_results->append(ref); | |
| 1524 _tag_results->append((uint64_t)entry->tag()); | |
| 1525 } | |
| 1526 } | |
| 1527 } | |
| 1528 | |
| 1529 // return the results from the collection | |
| 1530 // | |
| 1531 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
| 1532 jvmtiError error; | |
| 1533 int count = _object_results->length(); | |
| 1534 assert(count >= 0, "sanity check"); | |
| 1535 | |
| 1536 // if object_result_ptr is not NULL then allocate the result and copy | |
| 1537 // in the object references. | |
| 1538 if (object_result_ptr != NULL) { | |
| 1539 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
| 1540 if (error != JVMTI_ERROR_NONE) { | |
| 1541 return error; | |
| 1542 } | |
| 1543 for (int i=0; i<count; i++) { | |
| 1544 (*object_result_ptr)[i] = _object_results->at(i); | |
| 1545 } | |
| 1546 } | |
| 1547 | |
| 1548 // if tag_result_ptr is not NULL then allocate the result and copy | |
| 1549 // in the tag values. | |
| 1550 if (tag_result_ptr != NULL) { | |
| 1551 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
| 1552 if (error != JVMTI_ERROR_NONE) { | |
| 1553 if (object_result_ptr != NULL) { | |
| 1554 _env->Deallocate((unsigned char*)object_result_ptr); | |
| 1555 } | |
| 1556 return error; | |
| 1557 } | |
| 1558 for (int i=0; i<count; i++) { | |
| 1559 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
| 1560 } | |
| 1561 } | |
| 1562 | |
| 1563 *count_ptr = count; | |
| 1564 return JVMTI_ERROR_NONE; | |
| 1565 } | |
| 1566 }; | |
| 1567 | |
| 1568 // return the list of objects with the specified tags | |
| 1569 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
| 1570 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
| 1571 | |
| 1572 TagObjectCollector collector(env(), tags, count); | |
| 1573 { | |
| 1574 // iterate over all tagged objects | |
| 1575 MutexLocker ml(lock()); | |
| 1576 entry_iterate(&collector); | |
| 1577 } | |
| 1578 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
| 1579 } | |
| 1580 | |
| 1581 | |
| 1582 // ObjectMarker is used to support the marking objects when walking the | |
| 1583 // heap. | |
| 1584 // | |
| 1585 // This implementation uses the existing mark bits in an object for | |
| 1586 // marking. Objects that are marked must later have their headers restored. | |
| 1587 // As most objects are unlocked and don't have their identity hash computed | |
| 1588 // we don't have to save their headers. Instead we save the headers that | |
| 1589 // are "interesting". Later when the headers are restored this implementation | |
| 1590 // restores all headers to their initial value and then restores the few | |
| 1591 // objects that had interesting headers. | |
| 1592 // | |
| 1593 // Future work: This implementation currently uses growable arrays to save | |
| 1594 // the oop and header of interesting objects. As an optimization we could | |
| 1595 // use the same technique as the GC and make use of the unused area | |
| 1596 // between top() and end(). | |
| 1597 // | |
| 1598 | |
| 1599 // An ObjectClosure used to restore the mark bits of an object | |
| 1600 class RestoreMarksClosure : public ObjectClosure { | |
| 1601 public: | |
| 1602 void do_object(oop o) { | |
| 1603 if (o != NULL) { | |
| 1604 markOop mark = o->mark(); | |
| 1605 if (mark->is_marked()) { | |
| 1606 o->init_mark(); | |
| 1607 } | |
| 1608 } | |
| 1609 } | |
| 1610 }; | |
| 1611 | |
| 1612 // ObjectMarker provides the mark and visited functions | |
| 1613 class ObjectMarker : AllStatic { | |
| 1614 private: | |
| 1615 // saved headers | |
| 1616 static GrowableArray<oop>* _saved_oop_stack; | |
| 1617 static GrowableArray<markOop>* _saved_mark_stack; | |
| 3815 | 1618 static bool _needs_reset; // do we need to reset mark bits? |
| 0 | 1619 |
| 1620 public: | |
| 1621 static void init(); // initialize | |
| 1622 static void done(); // clean-up | |
| 1623 | |
| 1624 static inline void mark(oop o); // mark an object | |
| 1625 static inline bool visited(oop o); // check if object has been visited | |
| 3815 | 1626 |
| 1627 static inline bool needs_reset() { return _needs_reset; } | |
| 1628 static inline void set_needs_reset(bool v) { _needs_reset = v; } | |
| 0 | 1629 }; |
| 1630 | |
| 1631 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
| 1632 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
| 3815 | 1633 bool ObjectMarker::_needs_reset = true; // need to reset mark bits by default |
| 0 | 1634 |
| 1635 // initialize ObjectMarker - prepares for object marking | |
| 1636 void ObjectMarker::init() { | |
| 1637 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 1638 | |
| 1639 // prepare heap for iteration | |
| 1640 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
| 1641 | |
| 1642 // create stacks for interesting headers | |
| 6197 | 1643 _saved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markOop>(4000, true); |
| 1644 _saved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(4000, true); | |
| 0 | 1645 |
| 1646 if (UseBiasedLocking) { | |
| 1647 BiasedLocking::preserve_marks(); | |
| 1648 } | |
| 1649 } | |
| 1650 | |
| 1651 // Object marking is done so restore object headers | |
| 1652 void ObjectMarker::done() { | |
| 1653 // iterate over all objects and restore the mark bits to | |
| 1654 // their initial value | |
| 1655 RestoreMarksClosure blk; | |
| 3815 | 1656 if (needs_reset()) { |
| 1657 Universe::heap()->object_iterate(&blk); | |
| 1658 } else { | |
| 1659 // We don't need to reset mark bits on this call, but reset the | |
| 1660 // flag to the default for the next call. | |
| 1661 set_needs_reset(true); | |
| 1662 } | |
| 0 | 1663 |
| 1664 // now restore the interesting headers | |
| 1665 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
| 1666 oop o = _saved_oop_stack->at(i); | |
| 1667 markOop mark = _saved_mark_stack->at(i); | |
| 1668 o->set_mark(mark); | |
| 1669 } | |
| 1670 | |
| 1671 if (UseBiasedLocking) { | |
| 1672 BiasedLocking::restore_marks(); | |
| 1673 } | |
| 1674 | |
| 1675 // free the stacks | |
| 1676 delete _saved_oop_stack; | |
| 1677 delete _saved_mark_stack; | |
| 1678 } | |
| 1679 | |
| 1680 // mark an object | |
| 1681 inline void ObjectMarker::mark(oop o) { | |
| 1682 assert(Universe::heap()->is_in(o), "sanity check"); | |
| 1683 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
| 1684 | |
| 1685 // object's mark word | |
| 1686 markOop mark = o->mark(); | |
| 1687 | |
| 1688 if (mark->must_be_preserved(o)) { | |
| 1689 _saved_mark_stack->push(mark); | |
| 1690 _saved_oop_stack->push(o); | |
| 1691 } | |
| 1692 | |
| 1693 // mark the object | |
| 1694 o->set_mark(markOopDesc::prototype()->set_marked()); | |
| 1695 } | |
| 1696 | |
| 1697 // return true if object is marked | |
| 1698 inline bool ObjectMarker::visited(oop o) { | |
| 1699 return o->mark()->is_marked(); | |
| 1700 } | |
| 1701 | |
| 1702 // Stack allocated class to help ensure that ObjectMarker is used | |
| 1703 // correctly. Constructor initializes ObjectMarker, destructor calls | |
| 1704 // ObjectMarker's done() function to restore object headers. | |
| 1705 class ObjectMarkerController : public StackObj { | |
| 1706 public: | |
| 1707 ObjectMarkerController() { | |
| 1708 ObjectMarker::init(); | |
| 1709 } | |
| 1710 ~ObjectMarkerController() { | |
| 1711 ObjectMarker::done(); | |
| 1712 } | |
| 1713 }; | |
| 1714 | |
| 1715 | |
| 1716 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
| 1717 // (not performance critical as only used for roots) | |
| 1718 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
| 1719 switch (kind) { | |
| 1720 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
| 1721 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
| 1722 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
| 1723 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
| 1724 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
| 1725 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
| 1726 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
| 1727 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
| 1728 } | |
| 1729 } | |
| 1730 | |
| 1731 // Base class for all heap walk contexts. The base class maintains a flag | |
| 1732 // to indicate if the context is valid or not. | |
| 1733 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
| 1734 private: | |
| 1735 bool _valid; | |
| 1736 public: | |
| 1737 HeapWalkContext(bool valid) { _valid = valid; } | |
| 1738 void invalidate() { _valid = false; } | |
| 1739 bool is_valid() const { return _valid; } | |
| 1740 }; | |
| 1741 | |
| 1742 // A basic heap walk context for the deprecated heap walking functions. | |
| 1743 // The context for a basic heap walk are the callbacks and fields used by | |
| 1744 // the referrer caching scheme. | |
| 1745 class BasicHeapWalkContext: public HeapWalkContext { | |
| 1746 private: | |
| 1747 jvmtiHeapRootCallback _heap_root_callback; | |
| 1748 jvmtiStackReferenceCallback _stack_ref_callback; | |
| 1749 jvmtiObjectReferenceCallback _object_ref_callback; | |
| 1750 | |
| 1751 // used for caching | |
| 1752 oop _last_referrer; | |
| 1753 jlong _last_referrer_tag; | |
| 1754 | |
| 1755 public: | |
| 1756 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
| 1757 | |
| 1758 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
| 1759 jvmtiStackReferenceCallback stack_ref_callback, | |
| 1760 jvmtiObjectReferenceCallback object_ref_callback) : | |
| 1761 HeapWalkContext(true), | |
| 1762 _heap_root_callback(heap_root_callback), | |
| 1763 _stack_ref_callback(stack_ref_callback), | |
| 1764 _object_ref_callback(object_ref_callback), | |
| 1765 _last_referrer(NULL), | |
| 1766 _last_referrer_tag(0) { | |
| 1767 } | |
| 1768 | |
| 1769 // accessors | |
| 1770 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
| 1771 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
| 1772 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
| 1773 | |
| 1774 oop last_referrer() const { return _last_referrer; } | |
| 1775 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
| 1776 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
| 1777 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
| 1778 }; | |
| 1779 | |
| 1780 // The advanced heap walk context for the FollowReferences functions. | |
| 1781 // The context is the callbacks, and the fields used for filtering. | |
| 1782 class AdvancedHeapWalkContext: public HeapWalkContext { | |
| 1783 private: | |
| 1784 jint _heap_filter; | |
| 1785 KlassHandle _klass_filter; | |
| 1786 const jvmtiHeapCallbacks* _heap_callbacks; | |
| 1787 | |
| 1788 public: | |
| 1789 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
| 1790 | |
| 1791 AdvancedHeapWalkContext(jint heap_filter, | |
| 1792 KlassHandle klass_filter, | |
| 1793 const jvmtiHeapCallbacks* heap_callbacks) : | |
| 1794 HeapWalkContext(true), | |
| 1795 _heap_filter(heap_filter), | |
| 1796 _klass_filter(klass_filter), | |
| 1797 _heap_callbacks(heap_callbacks) { | |
| 1798 } | |
| 1799 | |
| 1800 // accessors | |
| 1801 jint heap_filter() const { return _heap_filter; } | |
| 1802 KlassHandle klass_filter() const { return _klass_filter; } | |
| 1803 | |
| 1804 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
| 1805 return _heap_callbacks->heap_reference_callback; | |
| 1806 }; | |
| 1807 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
| 1808 return _heap_callbacks->primitive_field_callback; | |
| 1809 } | |
| 1810 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
| 1811 return _heap_callbacks->array_primitive_value_callback; | |
| 1812 } | |
| 1813 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
| 1814 return _heap_callbacks->string_primitive_value_callback; | |
| 1815 } | |
| 1816 }; | |
| 1817 | |
| 1818 // The CallbackInvoker is a class with static functions that the heap walk can call | |
| 1819 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
| 1820 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
| 1821 // mode is for the newer FollowReferences function which supports a lot of | |
| 1822 // additional callbacks. | |
| 1823 class CallbackInvoker : AllStatic { | |
| 1824 private: | |
| 1825 // heap walk styles | |
| 1826 enum { basic, advanced }; | |
| 1827 static int _heap_walk_type; | |
| 1828 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
| 1829 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
| 1830 | |
| 1831 // context for basic style heap walk | |
| 1832 static BasicHeapWalkContext _basic_context; | |
| 1833 static BasicHeapWalkContext* basic_context() { | |
| 1834 assert(_basic_context.is_valid(), "invalid"); | |
| 1835 return &_basic_context; | |
| 1836 } | |
| 1837 | |
| 1838 // context for advanced style heap walk | |
| 1839 static AdvancedHeapWalkContext _advanced_context; | |
| 1840 static AdvancedHeapWalkContext* advanced_context() { | |
| 1841 assert(_advanced_context.is_valid(), "invalid"); | |
| 1842 return &_advanced_context; | |
| 1843 } | |
| 1844 | |
| 1845 // context needed for all heap walks | |
| 1846 static JvmtiTagMap* _tag_map; | |
| 1847 static const void* _user_data; | |
| 1848 static GrowableArray<oop>* _visit_stack; | |
| 1849 | |
| 1850 // accessors | |
| 1851 static JvmtiTagMap* tag_map() { return _tag_map; } | |
| 1852 static const void* user_data() { return _user_data; } | |
| 1853 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
| 1854 | |
| 1855 // if the object hasn't been visited then push it onto the visit stack | |
| 1856 // so that it will be visited later | |
| 1857 static inline bool check_for_visit(oop obj) { | |
| 1858 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
| 1859 return true; | |
| 1860 } | |
| 1861 | |
| 1862 // invoke basic style callbacks | |
| 1863 static inline bool invoke_basic_heap_root_callback | |
| 1864 (jvmtiHeapRootKind root_kind, oop obj); | |
| 1865 static inline bool invoke_basic_stack_ref_callback | |
| 1866 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
| 1867 int slot, oop obj); | |
| 1868 static inline bool invoke_basic_object_reference_callback | |
| 1869 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
| 1870 | |
| 1871 // invoke advanced style callbacks | |
| 1872 static inline bool invoke_advanced_heap_root_callback | |
| 1873 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
| 1874 static inline bool invoke_advanced_stack_ref_callback | |
| 1875 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
| 1876 jmethodID method, jlocation bci, jint slot, oop obj); | |
| 1877 static inline bool invoke_advanced_object_reference_callback | |
| 1878 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
| 1879 | |
| 1880 // used to report the value of primitive fields | |
| 1881 static inline bool report_primitive_field | |
| 1882 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
| 1883 | |
| 1884 public: | |
| 1885 // initialize for basic mode | |
| 1886 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
| 1887 GrowableArray<oop>* visit_stack, | |
| 1888 const void* user_data, | |
| 1889 BasicHeapWalkContext context); | |
| 1890 | |
| 1891 // initialize for advanced mode | |
| 1892 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
| 1893 GrowableArray<oop>* visit_stack, | |
| 1894 const void* user_data, | |
| 1895 AdvancedHeapWalkContext context); | |
| 1896 | |
| 1897 // functions to report roots | |
| 1898 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
| 1899 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
| 1900 jmethodID m, oop o); | |
| 1901 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
| 1902 jmethodID method, jlocation bci, jint slot, oop o); | |
| 1903 | |
| 1904 // functions to report references | |
| 1905 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
| 1906 static inline bool report_class_reference(oop referrer, oop referree); | |
| 1907 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
| 1908 static inline bool report_signers_reference(oop referrer, oop referree); | |
| 1909 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
| 1910 static inline bool report_superclass_reference(oop referrer, oop referree); | |
| 1911 static inline bool report_interface_reference(oop referrer, oop referree); | |
| 1912 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
| 1913 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
| 1914 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
| 1915 static inline bool report_primitive_array_values(oop array); | |
| 1916 static inline bool report_string_value(oop str); | |
| 1917 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
| 1918 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
| 1919 }; | |
| 1920 | |
| 1921 // statics | |
| 1922 int CallbackInvoker::_heap_walk_type; | |
| 1923 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
| 1924 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
| 1925 JvmtiTagMap* CallbackInvoker::_tag_map; | |
| 1926 const void* CallbackInvoker::_user_data; | |
| 1927 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
| 1928 | |
| 1929 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
| 1930 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
| 1931 GrowableArray<oop>* visit_stack, | |
| 1932 const void* user_data, | |
| 1933 BasicHeapWalkContext context) { | |
| 1934 _tag_map = tag_map; | |
| 1935 _visit_stack = visit_stack; | |
| 1936 _user_data = user_data; | |
| 1937 _basic_context = context; | |
| 1938 _advanced_context.invalidate(); // will trigger assertion if used | |
| 1939 _heap_walk_type = basic; | |
| 1940 } | |
| 1941 | |
| 1942 // initialize for advanced heap walk (FollowReferences) | |
| 1943 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
| 1944 GrowableArray<oop>* visit_stack, | |
| 1945 const void* user_data, | |
| 1946 AdvancedHeapWalkContext context) { | |
| 1947 _tag_map = tag_map; | |
| 1948 _visit_stack = visit_stack; | |
| 1949 _user_data = user_data; | |
| 1950 _advanced_context = context; | |
| 1951 _basic_context.invalidate(); // will trigger assertion if used | |
| 1952 _heap_walk_type = advanced; | |
| 1953 } | |
| 1954 | |
| 1955 | |
| 1956 // invoke basic style heap root callback | |
| 1957 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
| 1958 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 1959 | |
| 1960 // if we heap roots should be reported | |
| 1961 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
| 1962 if (cb == NULL) { | |
| 1963 return check_for_visit(obj); | |
| 1964 } | |
| 1965 | |
| 1966 CallbackWrapper wrapper(tag_map(), obj); | |
| 1967 jvmtiIterationControl control = (*cb)(root_kind, | |
| 1968 wrapper.klass_tag(), | |
| 1969 wrapper.obj_size(), | |
| 1970 wrapper.obj_tag_p(), | |
| 1971 (void*)user_data()); | |
| 1972 // push root to visit stack when following references | |
| 1973 if (control == JVMTI_ITERATION_CONTINUE && | |
| 1974 basic_context()->object_ref_callback() != NULL) { | |
| 1975 visit_stack()->push(obj); | |
| 1976 } | |
| 1977 return control != JVMTI_ITERATION_ABORT; | |
| 1978 } | |
| 1979 | |
| 1980 // invoke basic style stack ref callback | |
| 1981 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
| 1982 jlong thread_tag, | |
| 1983 jint depth, | |
| 1984 jmethodID method, | |
| 1985 jint slot, | |
| 1986 oop obj) { | |
| 1987 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 1988 | |
| 1989 // if we stack refs should be reported | |
| 1990 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
| 1991 if (cb == NULL) { | |
| 1992 return check_for_visit(obj); | |
| 1993 } | |
| 1994 | |
| 1995 CallbackWrapper wrapper(tag_map(), obj); | |
| 1996 jvmtiIterationControl control = (*cb)(root_kind, | |
| 1997 wrapper.klass_tag(), | |
| 1998 wrapper.obj_size(), | |
| 1999 wrapper.obj_tag_p(), | |
| 2000 thread_tag, | |
| 2001 depth, | |
| 2002 method, | |
| 2003 slot, | |
| 2004 (void*)user_data()); | |
| 2005 // push root to visit stack when following references | |
| 2006 if (control == JVMTI_ITERATION_CONTINUE && | |
| 2007 basic_context()->object_ref_callback() != NULL) { | |
| 2008 visit_stack()->push(obj); | |
| 2009 } | |
| 2010 return control != JVMTI_ITERATION_ABORT; | |
| 2011 } | |
| 2012 | |
| 2013 // invoke basic style object reference callback | |
| 2014 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
| 2015 oop referrer, | |
| 2016 oop referree, | |
| 2017 jint index) { | |
| 2018 | |
| 2019 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
| 2020 assert(ServiceUtil::visible_oop(referree), "checking"); | |
| 2021 | |
| 2022 BasicHeapWalkContext* context = basic_context(); | |
| 2023 | |
| 2024 // callback requires the referrer's tag. If it's the same referrer | |
| 2025 // as the last call then we use the cached value. | |
| 2026 jlong referrer_tag; | |
| 2027 if (referrer == context->last_referrer()) { | |
| 2028 referrer_tag = context->last_referrer_tag(); | |
| 2029 } else { | |
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2030 referrer_tag = tag_for(tag_map(), referrer); |
| 0 | 2031 } |
| 2032 | |
| 2033 // do the callback | |
| 2034 CallbackWrapper wrapper(tag_map(), referree); | |
| 2035 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
| 2036 jvmtiIterationControl control = (*cb)(ref_kind, | |
| 2037 wrapper.klass_tag(), | |
| 2038 wrapper.obj_size(), | |
| 2039 wrapper.obj_tag_p(), | |
| 2040 referrer_tag, | |
| 2041 index, | |
| 2042 (void*)user_data()); | |
| 2043 | |
| 2044 // record referrer and referrer tag. For self-references record the | |
| 2045 // tag value from the callback as this might differ from referrer_tag. | |
| 2046 context->set_last_referrer(referrer); | |
| 2047 if (referrer == referree) { | |
| 2048 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
| 2049 } else { | |
| 2050 context->set_last_referrer_tag(referrer_tag); | |
| 2051 } | |
| 2052 | |
| 2053 if (control == JVMTI_ITERATION_CONTINUE) { | |
| 2054 return check_for_visit(referree); | |
| 2055 } else { | |
| 2056 return control != JVMTI_ITERATION_ABORT; | |
| 2057 } | |
| 2058 } | |
| 2059 | |
| 2060 // invoke advanced style heap root callback | |
| 2061 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2062 oop obj) { | |
| 2063 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2064 | |
| 2065 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2066 | |
| 2067 // check that callback is provided | |
| 2068 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2069 if (cb == NULL) { | |
| 2070 return check_for_visit(obj); | |
| 2071 } | |
| 2072 | |
| 2073 // apply class filter | |
| 2074 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2075 return check_for_visit(obj); | |
| 2076 } | |
| 2077 | |
| 2078 // setup the callback wrapper | |
| 2079 CallbackWrapper wrapper(tag_map(), obj); | |
| 2080 | |
| 2081 // apply tag filter | |
| 2082 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2083 wrapper.klass_tag(), | |
| 2084 context->heap_filter())) { | |
| 2085 return check_for_visit(obj); | |
| 2086 } | |
| 2087 | |
| 2088 // for arrays we need the length, otherwise -1 | |
| 2089 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2090 | |
| 2091 // invoke the callback | |
| 2092 jint res = (*cb)(ref_kind, | |
| 2093 NULL, // referrer info | |
| 2094 wrapper.klass_tag(), | |
| 2095 0, // referrer_class_tag is 0 for heap root | |
| 2096 wrapper.obj_size(), | |
| 2097 wrapper.obj_tag_p(), | |
| 2098 NULL, // referrer_tag_p | |
| 2099 len, | |
| 2100 (void*)user_data()); | |
| 2101 if (res & JVMTI_VISIT_ABORT) { | |
| 2102 return false;// referrer class tag | |
| 2103 } | |
| 2104 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2105 check_for_visit(obj); | |
| 2106 } | |
| 2107 return true; | |
| 2108 } | |
| 2109 | |
| 2110 // report a reference from a thread stack to an object | |
| 2111 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2112 jlong thread_tag, | |
| 2113 jlong tid, | |
| 2114 int depth, | |
| 2115 jmethodID method, | |
| 2116 jlocation bci, | |
| 2117 jint slot, | |
| 2118 oop obj) { | |
| 2119 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2120 | |
| 2121 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2122 | |
| 2123 // check that callback is provider | |
| 2124 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2125 if (cb == NULL) { | |
| 2126 return check_for_visit(obj); | |
| 2127 } | |
| 2128 | |
| 2129 // apply class filter | |
| 2130 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2131 return check_for_visit(obj); | |
| 2132 } | |
| 2133 | |
| 2134 // setup the callback wrapper | |
| 2135 CallbackWrapper wrapper(tag_map(), obj); | |
| 2136 | |
| 2137 // apply tag filter | |
| 2138 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2139 wrapper.klass_tag(), | |
| 2140 context->heap_filter())) { | |
| 2141 return check_for_visit(obj); | |
| 2142 } | |
| 2143 | |
| 2144 // setup the referrer info | |
| 2145 jvmtiHeapReferenceInfo reference_info; | |
| 2146 reference_info.stack_local.thread_tag = thread_tag; | |
| 2147 reference_info.stack_local.thread_id = tid; | |
| 2148 reference_info.stack_local.depth = depth; | |
| 2149 reference_info.stack_local.method = method; | |
| 2150 reference_info.stack_local.location = bci; | |
| 2151 reference_info.stack_local.slot = slot; | |
| 2152 | |
| 2153 // for arrays we need the length, otherwise -1 | |
| 2154 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2155 | |
| 2156 // call into the agent | |
| 2157 int res = (*cb)(ref_kind, | |
| 2158 &reference_info, | |
| 2159 wrapper.klass_tag(), | |
| 2160 0, // referrer_class_tag is 0 for heap root (stack) | |
| 2161 wrapper.obj_size(), | |
| 2162 wrapper.obj_tag_p(), | |
| 2163 NULL, // referrer_tag is 0 for root | |
| 2164 len, | |
| 2165 (void*)user_data()); | |
| 2166 | |
| 2167 if (res & JVMTI_VISIT_ABORT) { | |
| 2168 return false; | |
| 2169 } | |
| 2170 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2171 check_for_visit(obj); | |
| 2172 } | |
| 2173 return true; | |
| 2174 } | |
| 2175 | |
| 2176 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
| 2177 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
| 2178 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
| 2179 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
| 2180 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
| 2181 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
| 2182 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
| 2183 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
| 2184 | |
| 2185 // invoke the object reference callback to report a reference | |
| 2186 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2187 oop referrer, | |
| 2188 oop obj, | |
| 2189 jint index) | |
| 2190 { | |
| 2191 // field index is only valid field in reference_info | |
| 2192 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 2193 | |
| 2194 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
| 2195 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2196 | |
| 2197 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2198 | |
| 2199 // check that callback is provider | |
| 2200 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2201 if (cb == NULL) { | |
| 2202 return check_for_visit(obj); | |
| 2203 } | |
| 2204 | |
| 2205 // apply class filter | |
| 2206 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2207 return check_for_visit(obj); | |
| 2208 } | |
| 2209 | |
| 2210 // setup the callback wrapper | |
| 2211 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
| 2212 | |
| 2213 // apply tag filter | |
| 2214 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2215 wrapper.klass_tag(), | |
| 2216 context->heap_filter())) { | |
| 2217 return check_for_visit(obj); | |
| 2218 } | |
| 2219 | |
| 2220 // field index is only valid field in reference_info | |
| 2221 reference_info.field.index = index; | |
| 2222 | |
| 2223 // for arrays we need the length, otherwise -1 | |
| 2224 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2225 | |
| 2226 // invoke the callback | |
| 2227 int res = (*cb)(ref_kind, | |
| 2228 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
| 2229 wrapper.klass_tag(), | |
| 2230 wrapper.referrer_klass_tag(), | |
| 2231 wrapper.obj_size(), | |
| 2232 wrapper.obj_tag_p(), | |
| 2233 wrapper.referrer_tag_p(), | |
| 2234 len, | |
| 2235 (void*)user_data()); | |
| 2236 | |
| 2237 if (res & JVMTI_VISIT_ABORT) { | |
| 2238 return false; | |
| 2239 } | |
| 2240 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2241 check_for_visit(obj); | |
| 2242 } | |
| 2243 return true; | |
| 2244 } | |
| 2245 | |
| 2246 // report a "simple root" | |
| 2247 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
| 2248 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
| 2249 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
| 2250 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2251 | |
| 2252 if (is_basic_heap_walk()) { | |
| 2253 // map to old style root kind | |
| 2254 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
| 2255 return invoke_basic_heap_root_callback(root_kind, obj); | |
| 2256 } else { | |
| 2257 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
| 2258 return invoke_advanced_heap_root_callback(kind, obj); | |
| 2259 } | |
| 2260 } | |
| 2261 | |
| 2262 | |
| 2263 // invoke the primitive array values | |
| 2264 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
| 2265 assert(obj->is_typeArray(), "not a primitive array"); | |
| 2266 | |
| 2267 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2268 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
| 2269 | |
| 2270 // apply class filter | |
| 2271 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2272 return true; | |
| 2273 } | |
| 2274 | |
| 2275 CallbackWrapper wrapper(tag_map(), obj); | |
| 2276 | |
| 2277 // apply tag filter | |
| 2278 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2279 wrapper.klass_tag(), | |
| 2280 context->heap_filter())) { | |
| 2281 return true; | |
| 2282 } | |
| 2283 | |
| 2284 // invoke the callback | |
| 2285 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
| 2286 &wrapper, | |
| 2287 obj, | |
| 2288 (void*)user_data()); | |
| 2289 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2290 } | |
| 2291 | |
| 2292 // invoke the string value callback | |
| 2293 inline bool CallbackInvoker::report_string_value(oop str) { | |
| 1142 | 2294 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
| 0 | 2295 |
| 2296 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2297 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
| 2298 | |
| 2299 // apply class filter | |
| 2300 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
| 2301 return true; | |
| 2302 } | |
| 2303 | |
| 2304 CallbackWrapper wrapper(tag_map(), str); | |
| 2305 | |
| 2306 // apply tag filter | |
| 2307 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2308 wrapper.klass_tag(), | |
| 2309 context->heap_filter())) { | |
| 2310 return true; | |
| 2311 } | |
| 2312 | |
| 2313 // invoke the callback | |
| 2314 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
| 2315 &wrapper, | |
| 2316 str, | |
| 2317 (void*)user_data()); | |
| 2318 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2319 } | |
| 2320 | |
| 2321 // invoke the primitive field callback | |
| 2322 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
| 2323 oop obj, | |
| 2324 jint index, | |
| 2325 address addr, | |
| 2326 char type) | |
| 2327 { | |
| 2328 // for primitive fields only the index will be set | |
| 2329 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 2330 | |
| 2331 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2332 assert(context->primitive_field_callback() != NULL, "no callback"); | |
| 2333 | |
| 2334 // apply class filter | |
| 2335 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2336 return true; | |
| 2337 } | |
| 2338 | |
| 2339 CallbackWrapper wrapper(tag_map(), obj); | |
| 2340 | |
| 2341 // apply tag filter | |
| 2342 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2343 wrapper.klass_tag(), | |
| 2344 context->heap_filter())) { | |
| 2345 return true; | |
| 2346 } | |
| 2347 | |
| 2348 // the field index in the referrer | |
| 2349 reference_info.field.index = index; | |
| 2350 | |
| 2351 // map the type | |
| 2352 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 2353 | |
| 2354 // setup the jvalue | |
| 2355 jvalue value; | |
| 2356 copy_to_jvalue(&value, addr, value_type); | |
| 2357 | |
| 2358 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
| 2359 int res = (*cb)(ref_kind, | |
| 2360 &reference_info, | |
| 2361 wrapper.klass_tag(), | |
| 2362 wrapper.obj_tag_p(), | |
| 2363 value, | |
| 2364 value_type, | |
| 2365 (void*)user_data()); | |
| 2366 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2367 } | |
| 2368 | |
| 2369 | |
| 2370 // instance field | |
| 2371 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
| 2372 jint index, | |
| 2373 address value, | |
| 2374 char type) { | |
| 2375 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
| 2376 obj, | |
| 2377 index, | |
| 2378 value, | |
| 2379 type); | |
| 2380 } | |
| 2381 | |
| 2382 // static field | |
| 2383 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
| 2384 jint index, | |
| 2385 address value, | |
| 2386 char type) { | |
| 2387 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
| 2388 obj, | |
| 2389 index, | |
| 2390 value, | |
| 2391 type); | |
| 2392 } | |
| 2393 | |
| 2394 // report a JNI local (root object) to the profiler | |
| 2395 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
| 2396 if (is_basic_heap_walk()) { | |
| 2397 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
| 2398 thread_tag, | |
| 2399 depth, | |
| 2400 m, | |
| 2401 -1, | |
| 2402 obj); | |
| 2403 } else { | |
| 2404 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
| 2405 thread_tag, tid, | |
| 2406 depth, | |
| 2407 m, | |
| 2408 (jlocation)-1, | |
| 2409 -1, | |
| 2410 obj); | |
| 2411 } | |
| 2412 } | |
| 2413 | |
| 2414 | |
| 2415 // report a local (stack reference, root object) | |
| 2416 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
| 2417 jlong tid, | |
| 2418 jint depth, | |
| 2419 jmethodID method, | |
| 2420 jlocation bci, | |
| 2421 jint slot, | |
| 2422 oop obj) { | |
| 2423 if (is_basic_heap_walk()) { | |
| 2424 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
| 2425 thread_tag, | |
| 2426 depth, | |
| 2427 method, | |
| 2428 slot, | |
| 2429 obj); | |
| 2430 } else { | |
| 2431 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
| 2432 thread_tag, | |
| 2433 tid, | |
| 2434 depth, | |
| 2435 method, | |
| 2436 bci, | |
| 2437 slot, | |
| 2438 obj); | |
| 2439 } | |
| 2440 } | |
| 2441 | |
| 2442 // report an object referencing a class. | |
| 2443 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
| 2444 if (is_basic_heap_walk()) { | |
| 2445 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
| 2446 } else { | |
| 2447 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
| 2448 } | |
| 2449 } | |
| 2450 | |
| 2451 // report a class referencing its class loader. | |
| 2452 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
| 2453 if (is_basic_heap_walk()) { | |
| 2454 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
| 2455 } else { | |
| 2456 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
| 2457 } | |
| 2458 } | |
| 2459 | |
| 2460 // report a class referencing its signers. | |
| 2461 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
| 2462 if (is_basic_heap_walk()) { | |
| 2463 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
| 2464 } else { | |
| 2465 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
| 2466 } | |
| 2467 } | |
| 2468 | |
| 2469 // report a class referencing its protection domain.. | |
| 2470 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
| 2471 if (is_basic_heap_walk()) { | |
| 2472 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
| 2473 } else { | |
| 2474 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
| 2475 } | |
| 2476 } | |
| 2477 | |
| 2478 // report a class referencing its superclass. | |
| 2479 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
| 2480 if (is_basic_heap_walk()) { | |
| 2481 // Send this to be consistent with past implementation | |
| 2482 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
| 2483 } else { | |
| 2484 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); | |
| 2485 } | |
| 2486 } | |
| 2487 | |
| 2488 // report a class referencing one of its interfaces. | |
| 2489 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
| 2490 if (is_basic_heap_walk()) { | |
| 2491 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
| 2492 } else { | |
| 2493 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
| 2494 } | |
| 2495 } | |
| 2496 | |
| 2497 // report a class referencing one of its static fields. | |
| 2498 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
| 2499 if (is_basic_heap_walk()) { | |
| 2500 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
| 2501 } else { | |
| 2502 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
| 2503 } | |
| 2504 } | |
| 2505 | |
| 2506 // report an array referencing an element object | |
| 2507 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
| 2508 if (is_basic_heap_walk()) { | |
| 2509 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
| 2510 } else { | |
| 2511 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
| 2512 } | |
| 2513 } | |
| 2514 | |
| 2515 // report an object referencing an instance field object | |
| 2516 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
| 2517 if (is_basic_heap_walk()) { | |
| 2518 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
| 2519 } else { | |
| 2520 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
| 2521 } | |
| 2522 } | |
| 2523 | |
| 2524 // report an array referencing an element object | |
| 2525 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
| 2526 if (is_basic_heap_walk()) { | |
| 2527 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
| 2528 } else { | |
| 2529 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
| 2530 } | |
| 2531 } | |
| 2532 | |
| 2533 // A supporting closure used to process simple roots | |
| 2534 class SimpleRootsClosure : public OopClosure { | |
| 2535 private: | |
| 2536 jvmtiHeapReferenceKind _kind; | |
| 2537 bool _continue; | |
| 2538 | |
| 2539 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
| 2540 | |
| 2541 public: | |
| 2542 void set_kind(jvmtiHeapReferenceKind kind) { | |
| 2543 _kind = kind; | |
| 2544 _continue = true; | |
| 2545 } | |
| 2546 | |
| 2547 inline bool stopped() { | |
| 2548 return !_continue; | |
| 2549 } | |
| 2550 | |
| 2551 void do_oop(oop* obj_p) { | |
| 2552 // iteration has terminated | |
| 2553 if (stopped()) { | |
| 2554 return; | |
| 2555 } | |
| 2556 | |
| 2557 // ignore null or deleted handles | |
| 2558 oop o = *obj_p; | |
| 2559 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
| 2560 return; | |
| 2561 } | |
| 2562 | |
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2563 assert(Universe::heap()->is_in_reserved(o), "should be impossible"); |
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2564 |
| 0 | 2565 jvmtiHeapReferenceKind kind = root_kind(); |
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2566 if (kind == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { |
| 0 | 2567 // SystemDictionary::always_strong_oops_do reports the application |
| 2568 // class loader as a root. We want this root to be reported as | |
| 2569 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
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2570 if (!o->is_instanceMirror()) { |
| 0 | 2571 kind = JVMTI_HEAP_REFERENCE_OTHER; |
| 2572 } | |
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2573 } |
| 0 | 2574 |
| 2575 // some objects are ignored - in the case of simple | |
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2576 // roots it's mostly Symbol*s that we are skipping |
| 0 | 2577 // here. |
| 2578 if (!ServiceUtil::visible_oop(o)) { | |
| 2579 return; | |
| 2580 } | |
| 2581 | |
| 2582 // invoke the callback | |
| 2583 _continue = CallbackInvoker::report_simple_root(kind, o); | |
| 2584 | |
| 2585 } | |
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2586 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| 0 | 2587 }; |
| 2588 | |
| 2589 // A supporting closure used to process JNI locals | |
| 2590 class JNILocalRootsClosure : public OopClosure { | |
| 2591 private: | |
| 2592 jlong _thread_tag; | |
| 2593 jlong _tid; | |
| 2594 jint _depth; | |
| 2595 jmethodID _method; | |
| 2596 bool _continue; | |
| 2597 public: | |
| 2598 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
| 2599 _thread_tag = thread_tag; | |
| 2600 _tid = tid; | |
| 2601 _depth = depth; | |
| 2602 _method = method; | |
| 2603 _continue = true; | |
| 2604 } | |
| 2605 | |
| 2606 inline bool stopped() { | |
| 2607 return !_continue; | |
| 2608 } | |
| 2609 | |
| 2610 void do_oop(oop* obj_p) { | |
| 2611 // iteration has terminated | |
| 2612 if (stopped()) { | |
| 2613 return; | |
| 2614 } | |
| 2615 | |
| 2616 // ignore null or deleted handles | |
| 2617 oop o = *obj_p; | |
| 2618 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
| 2619 return; | |
| 2620 } | |
| 2621 | |
| 2622 if (!ServiceUtil::visible_oop(o)) { | |
| 2623 return; | |
| 2624 } | |
| 2625 | |
| 2626 // invoke the callback | |
| 2627 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
| 2628 } | |
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2629 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| 0 | 2630 }; |
| 2631 | |
| 2632 | |
| 2633 // A VM operation to iterate over objects that are reachable from | |
| 2634 // a set of roots or an initial object. | |
| 2635 // | |
| 2636 // For VM_HeapWalkOperation the set of roots used is :- | |
| 2637 // | |
| 2638 // - All JNI global references | |
| 2639 // - All inflated monitors | |
| 2640 // - All classes loaded by the boot class loader (or all classes | |
| 2641 // in the event that class unloading is disabled) | |
| 2642 // - All java threads | |
| 2643 // - For each java thread then all locals and JNI local references | |
| 2644 // on the thread's execution stack | |
| 2645 // - All visible/explainable objects from Universes::oops_do | |
| 2646 // | |
| 2647 class VM_HeapWalkOperation: public VM_Operation { | |
| 2648 private: | |
| 2649 enum { | |
| 2650 initial_visit_stack_size = 4000 | |
| 2651 }; | |
| 2652 | |
| 2653 bool _is_advanced_heap_walk; // indicates FollowReferences | |
| 2654 JvmtiTagMap* _tag_map; | |
| 2655 Handle _initial_object; | |
| 2656 GrowableArray<oop>* _visit_stack; // the visit stack | |
| 2657 | |
| 2658 bool _collecting_heap_roots; // are we collecting roots | |
| 2659 bool _following_object_refs; // are we following object references | |
| 2660 | |
| 2661 bool _reporting_primitive_fields; // optional reporting | |
| 2662 bool _reporting_primitive_array_values; | |
| 2663 bool _reporting_string_values; | |
| 2664 | |
| 2665 GrowableArray<oop>* create_visit_stack() { | |
| 6197 | 2666 return new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(initial_visit_stack_size, true); |
| 0 | 2667 } |
| 2668 | |
| 2669 // accessors | |
| 2670 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
| 2671 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 2672 Handle initial_object() const { return _initial_object; } | |
| 2673 | |
| 2674 bool is_following_references() const { return _following_object_refs; } | |
| 2675 | |
| 2676 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
| 2677 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
| 2678 bool is_reporting_string_values() const { return _reporting_string_values; } | |
| 2679 | |
| 2680 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
| 2681 | |
| 2682 // iterate over the various object types | |
| 2683 inline bool iterate_over_array(oop o); | |
| 2684 inline bool iterate_over_type_array(oop o); | |
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2685 inline bool iterate_over_class(oop o); |
| 0 | 2686 inline bool iterate_over_object(oop o); |
| 2687 | |
| 2688 // root collection | |
| 2689 inline bool collect_simple_roots(); | |
| 2690 inline bool collect_stack_roots(); | |
| 2691 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
| 2692 | |
| 2693 // visit an object | |
| 2694 inline bool visit(oop o); | |
| 2695 | |
| 2696 public: | |
| 2697 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2698 Handle initial_object, | |
| 2699 BasicHeapWalkContext callbacks, | |
| 2700 const void* user_data); | |
| 2701 | |
| 2702 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2703 Handle initial_object, | |
| 2704 AdvancedHeapWalkContext callbacks, | |
| 2705 const void* user_data); | |
| 2706 | |
| 2707 ~VM_HeapWalkOperation(); | |
| 2708 | |
| 2709 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
| 2710 void doit(); | |
| 2711 }; | |
| 2712 | |
| 2713 | |
| 2714 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2715 Handle initial_object, | |
| 2716 BasicHeapWalkContext callbacks, | |
| 2717 const void* user_data) { | |
| 2718 _is_advanced_heap_walk = false; | |
| 2719 _tag_map = tag_map; | |
| 2720 _initial_object = initial_object; | |
| 2721 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
| 2722 _reporting_primitive_fields = false; | |
| 2723 _reporting_primitive_array_values = false; | |
| 2724 _reporting_string_values = false; | |
| 2725 _visit_stack = create_visit_stack(); | |
| 2726 | |
| 2727 | |
| 2728 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
| 2729 } | |
| 2730 | |
| 2731 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2732 Handle initial_object, | |
| 2733 AdvancedHeapWalkContext callbacks, | |
| 2734 const void* user_data) { | |
| 2735 _is_advanced_heap_walk = true; | |
| 2736 _tag_map = tag_map; | |
| 2737 _initial_object = initial_object; | |
| 2738 _following_object_refs = true; | |
| 2739 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
| 2740 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
| 2741 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
| 2742 _visit_stack = create_visit_stack(); | |
| 2743 | |
| 2744 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
| 2745 } | |
| 2746 | |
| 2747 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
| 2748 if (_following_object_refs) { | |
| 2749 assert(_visit_stack != NULL, "checking"); | |
| 2750 delete _visit_stack; | |
| 2751 _visit_stack = NULL; | |
| 2752 } | |
| 2753 } | |
| 2754 | |
| 2755 // an array references its class and has a reference to | |
| 2756 // each element in the array | |
| 2757 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
| 2758 objArrayOop array = objArrayOop(o); | |
| 2759 | |
| 2760 // array reference to its class | |
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2761 oop mirror = ObjArrayKlass::cast(array->klass())->java_mirror(); |
| 0 | 2762 if (!CallbackInvoker::report_class_reference(o, mirror)) { |
| 2763 return false; | |
| 2764 } | |
| 2765 | |
| 2766 // iterate over the array and report each reference to a | |
| 2767 // non-null element | |
| 2768 for (int index=0; index<array->length(); index++) { | |
| 2769 oop elem = array->obj_at(index); | |
| 2770 if (elem == NULL) { | |
| 2771 continue; | |
| 2772 } | |
| 2773 | |
| 2774 // report the array reference o[index] = elem | |
| 2775 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
| 2776 return false; | |
| 2777 } | |
| 2778 } | |
| 2779 return true; | |
| 2780 } | |
| 2781 | |
| 2782 // a type array references its class | |
| 2783 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
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2784 Klass* k = o->klass(); |
| 6983 | 2785 oop mirror = k->java_mirror(); |
| 0 | 2786 if (!CallbackInvoker::report_class_reference(o, mirror)) { |
| 2787 return false; | |
| 2788 } | |
| 2789 | |
| 2790 // report the array contents if required | |
| 2791 if (is_reporting_primitive_array_values()) { | |
| 2792 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
| 2793 return false; | |
| 2794 } | |
| 2795 } | |
| 2796 return true; | |
| 2797 } | |
| 2798 | |
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2799 #ifdef ASSERT |
| 0 | 2800 // verify that a static oop field is in range |
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2801 static inline bool verify_static_oop(InstanceKlass* ik, |
|
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2802 oop mirror, int offset) { |
|
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2803 address obj_p = (address)mirror + offset; |
|
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2804 address start = (address)InstanceMirrorKlass::start_of_static_fields(mirror); |
|
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2805 address end = start + (java_lang_Class::static_oop_field_count(mirror) * heapOopSize); |
| 0 | 2806 assert(end >= start, "sanity check"); |
| 2807 | |
| 2808 if (obj_p >= start && obj_p < end) { | |
| 2809 return true; | |
| 2810 } else { | |
| 2811 return false; | |
| 2812 } | |
| 2813 } | |
|
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2814 #endif // #ifdef ASSERT |
| 0 | 2815 |
| 2816 // a class references its super class, interfaces, class loader, ... | |
| 2817 // and finally its static fields | |
|
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2818 inline bool VM_HeapWalkOperation::iterate_over_class(oop java_class) { |
| 0 | 2819 int i; |
|
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2820 Klass* klass = java_lang_Class::as_Klass(java_class); |
| 0 | 2821 |
| 2822 if (klass->oop_is_instance()) { | |
|
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2823 InstanceKlass* ik = InstanceKlass::cast(klass); |
| 0 | 2824 |
| 2825 // ignore the class if it's has been initialized yet | |
| 2826 if (!ik->is_linked()) { | |
| 2827 return true; | |
| 2828 } | |
| 2829 | |
| 2830 // get the java mirror | |
| 2831 oop mirror = klass->java_mirror(); | |
| 2832 | |
| 2833 // super (only if something more interesting than java.lang.Object) | |
|
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2834 Klass* java_super = ik->java_super(); |
| 1142 | 2835 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
| 6983 | 2836 oop super = java_super->java_mirror(); |
| 0 | 2837 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { |
| 2838 return false; | |
| 2839 } | |
| 2840 } | |
| 2841 | |
| 2842 // class loader | |
| 2843 oop cl = ik->class_loader(); | |
| 2844 if (cl != NULL) { | |
| 2845 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
| 2846 return false; | |
| 2847 } | |
| 2848 } | |
| 2849 | |
| 2850 // protection domain | |
| 2851 oop pd = ik->protection_domain(); | |
| 2852 if (pd != NULL) { | |
| 2853 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
| 2854 return false; | |
| 2855 } | |
| 2856 } | |
| 2857 | |
| 2858 // signers | |
| 2859 oop signers = ik->signers(); | |
| 2860 if (signers != NULL) { | |
| 2861 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
| 2862 return false; | |
| 2863 } | |
| 2864 } | |
| 2865 | |
| 2866 // references from the constant pool | |
| 2867 { | |
|
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2868 ConstantPool* pool = ik->constants(); |
| 0 | 2869 for (int i = 1; i < pool->length(); i++) { |
| 2870 constantTag tag = pool->tag_at(i).value(); | |
| 2871 if (tag.is_string() || tag.is_klass()) { | |
| 2872 oop entry; | |
| 2873 if (tag.is_string()) { | |
| 2874 entry = pool->resolved_string_at(i); | |
|
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2875 // If the entry is non-null it is resolved. |
|
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2876 if (entry == NULL) continue; |
| 0 | 2877 } else { |
| 6983 | 2878 entry = pool->resolved_klass_at(i)->java_mirror(); |
| 0 | 2879 } |
| 2880 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
| 2881 return false; | |
| 2882 } | |
| 2883 } | |
| 2884 } | |
| 2885 } | |
| 2886 | |
| 2887 // interfaces | |
| 2888 // (These will already have been reported as references from the constant pool | |
| 2889 // but are specified by IterateOverReachableObjects and must be reported). | |
|
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2890 Array<Klass*>* interfaces = ik->local_interfaces(); |
| 0 | 2891 for (i = 0; i < interfaces->length(); i++) { |
| 6983 | 2892 oop interf = ((Klass*)interfaces->at(i))->java_mirror(); |
| 0 | 2893 if (interf == NULL) { |
| 2894 continue; | |
| 2895 } | |
| 2896 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
| 2897 return false; | |
| 2898 } | |
| 2899 } | |
| 2900 | |
| 2901 // iterate over the static fields | |
| 2902 | |
|
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2903 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
| 0 | 2904 for (i=0; i<field_map->field_count(); i++) { |
| 2905 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 2906 char type = field->field_type(); | |
| 2907 if (!is_primitive_field_type(type)) { | |
|
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2908 oop fld_o = mirror->obj_field(field->field_offset()); |
|
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2909 assert(verify_static_oop(ik, mirror, field->field_offset()), "sanity check"); |
| 0 | 2910 if (fld_o != NULL) { |
| 2911 int slot = field->field_index(); | |
| 2912 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
| 2913 delete field_map; | |
| 2914 return false; | |
| 2915 } | |
| 2916 } | |
| 2917 } else { | |
| 2918 if (is_reporting_primitive_fields()) { | |
|
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|
2919 address addr = (address)mirror + field->field_offset(); |
| 0 | 2920 int slot = field->field_index(); |
| 2921 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
| 2922 delete field_map; | |
| 2923 return false; | |
| 2924 } | |
| 2925 } | |
| 2926 } | |
| 2927 } | |
| 2928 delete field_map; | |
| 2929 | |
| 2930 return true; | |
| 2931 } | |
| 2932 | |
| 2933 return true; | |
| 2934 } | |
| 2935 | |
| 2936 // an object references a class and its instance fields | |
| 2937 // (static fields are ignored here as we report these as | |
| 2938 // references from the class). | |
| 2939 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
| 2940 // reference to the class | |
| 6983 | 2941 if (!CallbackInvoker::report_class_reference(o, o->klass()->java_mirror())) { |
| 0 | 2942 return false; |
| 2943 } | |
| 2944 | |
| 2945 // iterate over instance fields | |
| 2946 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
| 2947 for (int i=0; i<field_map->field_count(); i++) { | |
| 2948 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 2949 char type = field->field_type(); | |
| 2950 if (!is_primitive_field_type(type)) { | |
|
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|
2951 oop fld_o = o->obj_field(field->field_offset()); |
|
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|
2952 // ignore any objects that aren't visible to profiler |
|
2b150750d53d
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|
2953 if (fld_o != NULL && ServiceUtil::visible_oop(fld_o)) { |
|
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2954 assert(Universe::heap()->is_in_reserved(fld_o), "unsafe code should not " |
|
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|
2955 "have references to Klass* anymore"); |
| 0 | 2956 int slot = field->field_index(); |
| 2957 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
| 2958 return false; | |
| 2959 } | |
| 2960 } | |
| 2961 } else { | |
| 2962 if (is_reporting_primitive_fields()) { | |
| 2963 // primitive instance field | |
| 2964 address addr = (address)o + field->field_offset(); | |
| 2965 int slot = field->field_index(); | |
| 2966 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
| 2967 return false; | |
| 2968 } | |
| 2969 } | |
| 2970 } | |
| 2971 } | |
| 2972 | |
| 2973 // if the object is a java.lang.String | |
| 2974 if (is_reporting_string_values() && | |
| 1142 | 2975 o->klass() == SystemDictionary::String_klass()) { |
| 0 | 2976 if (!CallbackInvoker::report_string_value(o)) { |
| 2977 return false; | |
| 2978 } | |
| 2979 } | |
| 2980 return true; | |
| 2981 } | |
| 2982 | |
| 2983 | |
|
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|
2984 // Collects all simple (non-stack) roots except for threads; |
|
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|
2985 // threads are handled in collect_stack_roots() as an optimization. |
| 0 | 2986 // if there's a heap root callback provided then the callback is |
| 2987 // invoked for each simple root. | |
| 2988 // if an object reference callback is provided then all simple | |
| 2989 // roots are pushed onto the marking stack so that they can be | |
| 2990 // processed later | |
| 2991 // | |
| 2992 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
| 2993 SimpleRootsClosure blk; | |
| 2994 | |
| 2995 // JNI globals | |
| 2996 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
| 2997 JNIHandles::oops_do(&blk); | |
| 2998 if (blk.stopped()) { | |
| 2999 return false; | |
| 3000 } | |
| 3001 | |
| 3002 // Preloaded classes and loader from the system dictionary | |
| 3003 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
| 3004 SystemDictionary::always_strong_oops_do(&blk); | |
|
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|
3005 KlassToOopClosure klass_blk(&blk); |
|
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|
3006 ClassLoaderDataGraph::always_strong_oops_do(&blk, &klass_blk, false); |
| 0 | 3007 if (blk.stopped()) { |
| 3008 return false; | |
| 3009 } | |
| 3010 | |
| 3011 // Inflated monitors | |
| 3012 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
| 3013 ObjectSynchronizer::oops_do(&blk); | |
| 3014 if (blk.stopped()) { | |
| 3015 return false; | |
| 3016 } | |
| 3017 | |
|
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|
3018 // threads are now handled in collect_stack_roots() |
| 0 | 3019 |
| 3020 // Other kinds of roots maintained by HotSpot | |
| 3021 // Many of these won't be visible but others (such as instances of important | |
| 3022 // exceptions) will be visible. | |
| 3023 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
| 3024 Universe::oops_do(&blk); | |
|
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3025 |
|
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3026 // If there are any non-perm roots in the code cache, visit them. |
|
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|
3027 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
|
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|
3028 CodeBlobToOopClosure look_in_blobs(&blk, !CodeBlobToOopClosure::FixRelocations); |
|
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|
3029 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
|
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|
3030 |
| 0 | 3031 return true; |
| 3032 } | |
| 3033 | |
| 3034 // Walk the stack of a given thread and find all references (locals | |
| 3035 // and JNI calls) and report these as stack references | |
| 3036 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
| 3037 JNILocalRootsClosure* blk) | |
| 3038 { | |
| 3039 oop threadObj = java_thread->threadObj(); | |
| 3040 assert(threadObj != NULL, "sanity check"); | |
| 3041 | |
| 3042 // only need to get the thread's tag once per thread | |
| 3043 jlong thread_tag = tag_for(_tag_map, threadObj); | |
| 3044 | |
| 3045 // also need the thread id | |
| 3046 jlong tid = java_lang_Thread::thread_id(threadObj); | |
| 3047 | |
| 3048 | |
| 3049 if (java_thread->has_last_Java_frame()) { | |
| 3050 | |
| 3051 // vframes are resource allocated | |
| 3052 Thread* current_thread = Thread::current(); | |
| 3053 ResourceMark rm(current_thread); | |
| 3054 HandleMark hm(current_thread); | |
| 3055 | |
| 3056 RegisterMap reg_map(java_thread); | |
| 3057 frame f = java_thread->last_frame(); | |
| 3058 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
| 3059 | |
| 3060 bool is_top_frame = true; | |
| 3061 int depth = 0; | |
| 3062 frame* last_entry_frame = NULL; | |
| 3063 | |
| 3064 while (vf != NULL) { | |
| 3065 if (vf->is_java_frame()) { | |
| 3066 | |
| 3067 // java frame (interpreted, compiled, ...) | |
| 3068 javaVFrame *jvf = javaVFrame::cast(vf); | |
| 3069 | |
| 3070 // the jmethodID | |
| 3071 jmethodID method = jvf->method()->jmethod_id(); | |
| 3072 | |
| 3073 if (!(jvf->method()->is_native())) { | |
| 3074 jlocation bci = (jlocation)jvf->bci(); | |
| 3075 StackValueCollection* locals = jvf->locals(); | |
| 3076 for (int slot=0; slot<locals->size(); slot++) { | |
| 3077 if (locals->at(slot)->type() == T_OBJECT) { | |
| 3078 oop o = locals->obj_at(slot)(); | |
| 3079 if (o == NULL) { | |
| 3080 continue; | |
| 3081 } | |
| 3082 | |
| 3083 // stack reference | |
| 3084 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
| 3085 bci, slot, o)) { | |
| 3086 return false; | |
| 3087 } | |
| 3088 } | |
| 3089 } | |
| 3090 } else { | |
| 3091 blk->set_context(thread_tag, tid, depth, method); | |
| 3092 if (is_top_frame) { | |
| 3093 // JNI locals for the top frame. | |
| 3094 java_thread->active_handles()->oops_do(blk); | |
| 3095 } else { | |
| 3096 if (last_entry_frame != NULL) { | |
| 3097 // JNI locals for the entry frame | |
| 3098 assert(last_entry_frame->is_entry_frame(), "checking"); | |
| 3099 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
| 3100 } | |
| 3101 } | |
| 3102 } | |
| 3103 last_entry_frame = NULL; | |
| 3104 depth++; | |
| 3105 } else { | |
| 3106 // externalVFrame - for an entry frame then we report the JNI locals | |
| 3107 // when we find the corresponding javaVFrame | |
| 3108 frame* fr = vf->frame_pointer(); | |
| 3109 assert(fr != NULL, "sanity check"); | |
| 3110 if (fr->is_entry_frame()) { | |
| 3111 last_entry_frame = fr; | |
| 3112 } | |
| 3113 } | |
| 3114 | |
| 3115 vf = vf->sender(); | |
| 3116 is_top_frame = false; | |
| 3117 } | |
| 3118 } else { | |
| 3119 // no last java frame but there may be JNI locals | |
| 3120 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
| 3121 java_thread->active_handles()->oops_do(blk); | |
| 3122 } | |
| 3123 return true; | |
| 3124 } | |
| 3125 | |
| 3126 | |
|
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3127 // Collects the simple roots for all threads and collects all |
|
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|
3128 // stack roots - for each thread it walks the execution |
| 0 | 3129 // stack to find all references and local JNI refs. |
| 3130 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
| 3131 JNILocalRootsClosure blk; | |
| 3132 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
| 3133 oop threadObj = thread->threadObj(); | |
| 3134 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
|
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|
3135 // Collect the simple root for this thread before we |
|
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|
3136 // collect its stack roots |
|
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|
3137 if (!CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, |
|
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|
3138 threadObj)) { |
|
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|
3139 return false; |
|
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|
3140 } |
| 0 | 3141 if (!collect_stack_roots(thread, &blk)) { |
| 3142 return false; | |
| 3143 } | |
| 3144 } | |
| 3145 } | |
| 3146 return true; | |
| 3147 } | |
| 3148 | |
| 3149 // visit an object | |
| 3150 // first mark the object as visited | |
| 3151 // second get all the outbound references from this object (in other words, all | |
| 3152 // the objects referenced by this object). | |
| 3153 // | |
| 3154 bool VM_HeapWalkOperation::visit(oop o) { | |
| 3155 // mark object as visited | |
| 3156 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
| 3157 ObjectMarker::mark(o); | |
| 3158 | |
| 3159 // instance | |
| 3160 if (o->is_instance()) { | |
| 1142 | 3161 if (o->klass() == SystemDictionary::Class_klass()) { |
|
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|
3162 if (!java_lang_Class::is_primitive(o)) { |
| 0 | 3163 // a java.lang.Class |
|
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3164 return iterate_over_class(o); |
| 0 | 3165 } |
| 3166 } else { | |
| 3167 return iterate_over_object(o); | |
| 3168 } | |
| 3169 } | |
| 3170 | |
| 3171 // object array | |
| 3172 if (o->is_objArray()) { | |
| 3173 return iterate_over_array(o); | |
| 3174 } | |
| 3175 | |
| 3176 // type array | |
| 3177 if (o->is_typeArray()) { | |
| 3178 return iterate_over_type_array(o); | |
| 3179 } | |
| 3180 | |
| 3181 return true; | |
| 3182 } | |
| 3183 | |
| 3184 void VM_HeapWalkOperation::doit() { | |
| 3185 ResourceMark rm; | |
| 3186 ObjectMarkerController marker; | |
| 3187 ClassFieldMapCacheMark cm; | |
| 3188 | |
| 3189 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
| 3190 | |
| 3191 // the heap walk starts with an initial object or the heap roots | |
| 3192 if (initial_object().is_null()) { | |
| 3815 | 3193 // If either collect_stack_roots() or collect_simple_roots() |
| 3194 // returns false at this point, then there are no mark bits | |
| 3195 // to reset. | |
| 3196 ObjectMarker::set_needs_reset(false); | |
| 3197 | |
|
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3198 // Calling collect_stack_roots() before collect_simple_roots() |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3199 // 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
|
3200 // focused on analyzing references in the thread stacks. |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3201 if (!collect_stack_roots()) return; |
|
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3202 |
| 0 | 3203 if (!collect_simple_roots()) return; |
| 3815 | 3204 |
| 3205 // no early return so enable heap traversal to reset the mark bits | |
| 3206 ObjectMarker::set_needs_reset(true); | |
| 0 | 3207 } else { |
| 3208 visit_stack()->push(initial_object()()); | |
| 3209 } | |
| 3210 | |
| 3211 // object references required | |
| 3212 if (is_following_references()) { | |
| 3213 | |
| 3214 // visit each object until all reachable objects have been | |
| 3215 // visited or the callback asked to terminate the iteration. | |
| 3216 while (!visit_stack()->is_empty()) { | |
| 3217 oop o = visit_stack()->pop(); | |
| 3218 if (!ObjectMarker::visited(o)) { | |
| 3219 if (!visit(o)) { | |
| 3220 break; | |
| 3221 } | |
| 3222 } | |
| 3223 } | |
| 3224 } | |
| 3225 } | |
| 3226 | |
| 3227 // iterate over all objects that are reachable from a set of roots | |
| 3228 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
| 3229 jvmtiStackReferenceCallback stack_ref_callback, | |
| 3230 jvmtiObjectReferenceCallback object_ref_callback, | |
| 3231 const void* user_data) { | |
| 3232 MutexLocker ml(Heap_lock); | |
| 3233 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
| 3234 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
| 3235 VMThread::execute(&op); | |
| 3236 } | |
| 3237 | |
| 3238 // iterate over all objects that are reachable from a given object | |
| 3239 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
| 3240 jvmtiObjectReferenceCallback object_ref_callback, | |
| 3241 const void* user_data) { | |
| 3242 oop obj = JNIHandles::resolve(object); | |
| 3243 Handle initial_object(Thread::current(), obj); | |
| 3244 | |
| 3245 MutexLocker ml(Heap_lock); | |
| 3246 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
| 3247 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
| 3248 VMThread::execute(&op); | |
| 3249 } | |
| 3250 | |
| 3251 // follow references from an initial object or the GC roots | |
| 3252 void JvmtiTagMap::follow_references(jint heap_filter, | |
| 3253 KlassHandle klass, | |
| 3254 jobject object, | |
| 3255 const jvmtiHeapCallbacks* callbacks, | |
| 3256 const void* user_data) | |
| 3257 { | |
| 3258 oop obj = JNIHandles::resolve(object); | |
| 3259 Handle initial_object(Thread::current(), obj); | |
| 3260 | |
| 3261 MutexLocker ml(Heap_lock); | |
| 3262 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
| 3263 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
| 3264 VMThread::execute(&op); | |
| 3265 } | |
| 3266 | |
| 3267 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3268 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
|
3269 // 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
|
3270 // 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
|
3271 // 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
|
3272 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
|
3273 SafepointSynchronize::is_at_safepoint(), |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3274 "must be executed at a safepoint"); |
| 0 | 3275 if (JvmtiEnv::environments_might_exist()) { |
| 3276 JvmtiEnvIterator it; | |
| 3277 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
| 3278 JvmtiTagMap* tag_map = env->tag_map(); | |
| 3279 if (tag_map != NULL && !tag_map->is_empty()) { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3280 tag_map->do_weak_oops(is_alive, f); |
| 0 | 3281 } |
| 3282 } | |
| 3283 } | |
| 3284 } | |
| 3285 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3286 void JvmtiTagMap::do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f) { |
| 0 | 3287 |
| 3288 // does this environment have the OBJECT_FREE event enabled | |
| 3289 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
| 3290 | |
| 3291 // counters used for trace message | |
| 3292 int freed = 0; | |
| 3293 int moved = 0; | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3294 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3295 JvmtiTagHashmap* hashmap = this->hashmap(); |
| 0 | 3296 |
| 3297 // reenable sizing (if disabled) | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3298 hashmap->set_resizing_enabled(true); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3299 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3300 // 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
|
3301 if (hashmap->_entry_count == 0) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3302 return; |
| 0 | 3303 } |
| 3304 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3305 // now iterate through each entry in the table |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3306 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3307 JvmtiTagHashmapEntry** table = hashmap->table(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3308 int size = hashmap->size(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3309 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3310 JvmtiTagHashmapEntry* delayed_add = NULL; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3311 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3312 for (int pos = 0; pos < size; ++pos) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3313 JvmtiTagHashmapEntry* entry = table[pos]; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3314 JvmtiTagHashmapEntry* prev = NULL; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3315 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3316 while (entry != NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3317 JvmtiTagHashmapEntry* next = entry->next(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3318 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3319 oop* obj = entry->object_addr(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3320 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3321 // has object been GC'ed |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3322 if (!is_alive->do_object_b(entry->object())) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3323 // grab the tag |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3324 jlong tag = entry->tag(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3325 guarantee(tag != 0, "checking"); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3326 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3327 // remove GC'ed entry from hashmap and return the |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3328 // entry to the free list |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3329 hashmap->remove(prev, pos, entry); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3330 destroy_entry(entry); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3331 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3332 // post the event to the profiler |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3333 if (post_object_free) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3334 JvmtiExport::post_object_free(env(), tag); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3335 } |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3336 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3337 ++freed; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3338 } else { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3339 f->do_oop(entry->object_addr()); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3340 oop new_oop = entry->object(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3341 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3342 // 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
|
3343 // entry to its new location. |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3344 unsigned int new_pos = JvmtiTagHashmap::hash(new_oop, size); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3345 if (new_pos != (unsigned int)pos) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3346 if (prev == NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3347 table[pos] = next; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3348 } else { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3349 prev->set_next(next); |
| 0 | 3350 } |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3351 if (new_pos < (unsigned int)pos) { |
| 0 | 3352 entry->set_next(table[new_pos]); |
| 3353 table[new_pos] = entry; | |
| 3354 } else { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3355 // 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
|
3356 // hitting it again during this iteration. |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3357 entry->set_next(delayed_add); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3358 delayed_add = entry; |
| 0 | 3359 } |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3360 moved++; |
| 0 | 3361 } else { |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3362 // object didn't move |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3363 prev = entry; |
| 0 | 3364 } |
| 3365 } | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3366 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3367 entry = next; |
| 0 | 3368 } |
| 3369 } | |
| 3370 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3371 // Re-add all the entries which were kept aside |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3372 while (delayed_add != NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3373 JvmtiTagHashmapEntry* next = delayed_add->next(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3374 unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3375 delayed_add->set_next(table[pos]); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3376 table[pos] = delayed_add; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3377 delayed_add = next; |
| 0 | 3378 } |
| 3379 | |
| 3380 // stats | |
| 3381 if (TraceJVMTIObjectTagging) { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3382 int post_total = hashmap->_entry_count; |
| 0 | 3383 int pre_total = post_total + freed; |
| 3384 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3385 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
|
3386 pre_total, post_total, freed, moved); |
| 0 | 3387 } |
| 3388 } |