Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiTagMap.cpp @ 2145:c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
Summary: Refine assertion to work before VMThread has started.
Reviewed-by: ysr, never, dholmes, acorn
| author | dcubed |
|---|---|
| date | Wed, 19 Jan 2011 07:41:39 -0800 |
| parents | 7246a374a9f2 |
| children | 3582bf76420e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2003, 2010, 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" | |
| 30 #include "oops/objArrayKlass.hpp" | |
| 31 #include "oops/oop.inline2.hpp" | |
| 32 #include "prims/jvmtiEventController.hpp" | |
| 33 #include "prims/jvmtiEventController.inline.hpp" | |
| 34 #include "prims/jvmtiExport.hpp" | |
| 35 #include "prims/jvmtiImpl.hpp" | |
| 36 #include "prims/jvmtiTagMap.hpp" | |
| 37 #include "runtime/biasedLocking.hpp" | |
| 38 #include "runtime/javaCalls.hpp" | |
| 39 #include "runtime/jniHandles.hpp" | |
| 40 #include "runtime/mutex.hpp" | |
| 41 #include "runtime/mutexLocker.hpp" | |
| 42 #include "runtime/reflectionUtils.hpp" | |
| 43 #include "runtime/vframe.hpp" | |
| 44 #include "runtime/vmThread.hpp" | |
| 45 #include "runtime/vm_operations.hpp" | |
| 46 #include "services/serviceUtil.hpp" | |
| 47 #ifndef SERIALGC | |
| 48 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
| 49 #endif | |
| 0 | 50 |
| 51 // JvmtiTagHashmapEntry | |
| 52 // | |
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53 // Each entry encapsulates a reference to the tagged object |
| 0 | 54 // and the tag value. In addition an entry includes a next pointer which |
| 55 // is used to chain entries together. | |
| 56 | |
| 57 class JvmtiTagHashmapEntry : public CHeapObj { | |
| 58 private: | |
| 59 friend class JvmtiTagMap; | |
| 60 | |
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61 oop _object; // tagged object |
| 0 | 62 jlong _tag; // the tag |
| 63 JvmtiTagHashmapEntry* _next; // next on the list | |
| 64 | |
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65 inline void init(oop object, jlong tag) { |
| 0 | 66 _object = object; |
| 67 _tag = tag; | |
| 68 _next = NULL; | |
| 69 } | |
| 70 | |
| 71 // constructor | |
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72 JvmtiTagHashmapEntry(oop object, jlong tag) { init(object, tag); } |
| 0 | 73 |
| 74 public: | |
| 75 | |
| 76 // accessor methods | |
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77 inline oop object() const { return _object; } |
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78 inline oop* object_addr() { return &_object; } |
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79 inline jlong tag() const { return _tag; } |
| 0 | 80 |
| 81 inline void set_tag(jlong tag) { | |
| 82 assert(tag != 0, "can't be zero"); | |
| 83 _tag = tag; | |
| 84 } | |
| 85 | |
| 86 inline JvmtiTagHashmapEntry* next() const { return _next; } | |
| 87 inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; } | |
| 88 }; | |
| 89 | |
| 90 | |
| 91 // JvmtiTagHashmap | |
| 92 // | |
| 93 // A hashmap is essentially a table of pointers to entries. Entries | |
| 94 // are hashed to a location, or position in the table, and then | |
| 95 // chained from that location. The "key" for hashing is address of | |
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96 // the object, or oop. The "value" is the tag value. |
| 0 | 97 // |
| 98 // A hashmap maintains a count of the number entries in the hashmap | |
| 99 // and resizes if the number of entries exceeds a given threshold. | |
| 100 // The threshold is specified as a percentage of the size - for | |
| 101 // example a threshold of 0.75 will trigger the hashmap to resize | |
| 102 // if the number of entries is >75% of table size. | |
| 103 // | |
| 104 // A hashmap provides functions for adding, removing, and finding | |
| 105 // entries. It also provides a function to iterate over all entries | |
| 106 // in the hashmap. | |
| 107 | |
| 108 class JvmtiTagHashmap : public CHeapObj { | |
| 109 private: | |
| 110 friend class JvmtiTagMap; | |
| 111 | |
| 112 enum { | |
| 113 small_trace_threshold = 10000, // threshold for tracing | |
| 114 medium_trace_threshold = 100000, | |
| 115 large_trace_threshold = 1000000, | |
| 116 initial_trace_threshold = small_trace_threshold | |
| 117 }; | |
| 118 | |
| 119 static int _sizes[]; // array of possible hashmap sizes | |
| 120 int _size; // actual size of the table | |
| 121 int _size_index; // index into size table | |
| 122 | |
| 123 int _entry_count; // number of entries in the hashmap | |
| 124 | |
| 125 float _load_factor; // load factor as a % of the size | |
| 126 int _resize_threshold; // computed threshold to trigger resizing. | |
| 127 bool _resizing_enabled; // indicates if hashmap can resize | |
| 128 | |
| 129 int _trace_threshold; // threshold for trace messages | |
| 130 | |
| 131 JvmtiTagHashmapEntry** _table; // the table of entries. | |
| 132 | |
| 133 // private accessors | |
| 134 int resize_threshold() const { return _resize_threshold; } | |
| 135 int trace_threshold() const { return _trace_threshold; } | |
| 136 | |
| 137 // initialize the hashmap | |
| 138 void init(int size_index=0, float load_factor=4.0f) { | |
| 139 int initial_size = _sizes[size_index]; | |
| 140 _size_index = size_index; | |
| 141 _size = initial_size; | |
| 142 _entry_count = 0; | |
| 143 if (TraceJVMTIObjectTagging) { | |
| 144 _trace_threshold = initial_trace_threshold; | |
| 145 } else { | |
| 146 _trace_threshold = -1; | |
| 147 } | |
| 148 _load_factor = load_factor; | |
| 149 _resize_threshold = (int)(_load_factor * _size); | |
| 150 _resizing_enabled = true; | |
| 151 size_t s = initial_size * sizeof(JvmtiTagHashmapEntry*); | |
| 152 _table = (JvmtiTagHashmapEntry**)os::malloc(s); | |
| 153 if (_table == NULL) { | |
| 154 vm_exit_out_of_memory(s, "unable to allocate initial hashtable for jvmti object tags"); | |
| 155 } | |
| 156 for (int i=0; i<initial_size; i++) { | |
| 157 _table[i] = NULL; | |
| 158 } | |
| 159 } | |
| 160 | |
| 161 // hash a given key (oop) with the specified size | |
| 162 static unsigned int hash(oop key, int size) { | |
| 163 // shift right to get better distribution (as these bits will be zero | |
| 164 // with aligned addresses) | |
| 165 unsigned int addr = (unsigned int)((intptr_t)key); | |
| 166 #ifdef _LP64 | |
| 167 return (addr >> 3) % size; | |
| 168 #else | |
| 169 return (addr >> 2) % size; | |
| 170 #endif | |
| 171 } | |
| 172 | |
| 173 // hash a given key (oop) | |
| 174 unsigned int hash(oop key) { | |
| 175 return hash(key, _size); | |
| 176 } | |
| 177 | |
| 178 // resize the hashmap - allocates a large table and re-hashes | |
| 179 // all entries into the new table. | |
| 180 void resize() { | |
| 181 int new_size_index = _size_index+1; | |
| 182 int new_size = _sizes[new_size_index]; | |
| 183 if (new_size < 0) { | |
| 184 // hashmap already at maximum capacity | |
| 185 return; | |
| 186 } | |
| 187 | |
| 188 // allocate new table | |
| 189 size_t s = new_size * sizeof(JvmtiTagHashmapEntry*); | |
| 190 JvmtiTagHashmapEntry** new_table = (JvmtiTagHashmapEntry**)os::malloc(s); | |
| 191 if (new_table == NULL) { | |
| 192 warning("unable to allocate larger hashtable for jvmti object tags"); | |
| 193 set_resizing_enabled(false); | |
| 194 return; | |
| 195 } | |
| 196 | |
| 197 // initialize new table | |
| 198 int i; | |
| 199 for (i=0; i<new_size; i++) { | |
| 200 new_table[i] = NULL; | |
| 201 } | |
| 202 | |
| 203 // rehash all entries into the new table | |
| 204 for (i=0; i<_size; i++) { | |
| 205 JvmtiTagHashmapEntry* entry = _table[i]; | |
| 206 while (entry != NULL) { | |
| 207 JvmtiTagHashmapEntry* next = entry->next(); | |
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208 oop key = entry->object(); |
| 0 | 209 assert(key != NULL, "jni weak reference cleared!!"); |
| 210 unsigned int h = hash(key, new_size); | |
| 211 JvmtiTagHashmapEntry* anchor = new_table[h]; | |
| 212 if (anchor == NULL) { | |
| 213 new_table[h] = entry; | |
| 214 entry->set_next(NULL); | |
| 215 } else { | |
| 216 entry->set_next(anchor); | |
| 217 new_table[h] = entry; | |
| 218 } | |
| 219 entry = next; | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 // free old table and update settings. | |
| 224 os::free((void*)_table); | |
| 225 _table = new_table; | |
| 226 _size_index = new_size_index; | |
| 227 _size = new_size; | |
| 228 | |
| 229 // compute new resize threshold | |
| 230 _resize_threshold = (int)(_load_factor * _size); | |
| 231 } | |
| 232 | |
| 233 | |
| 234 // internal remove function - remove an entry at a given position in the | |
| 235 // table. | |
| 236 inline void remove(JvmtiTagHashmapEntry* prev, int pos, JvmtiTagHashmapEntry* entry) { | |
| 237 assert(pos >= 0 && pos < _size, "out of range"); | |
| 238 if (prev == NULL) { | |
| 239 _table[pos] = entry->next(); | |
| 240 } else { | |
| 241 prev->set_next(entry->next()); | |
| 242 } | |
| 243 assert(_entry_count > 0, "checking"); | |
| 244 _entry_count--; | |
| 245 } | |
| 246 | |
| 247 // resizing switch | |
| 248 bool is_resizing_enabled() const { return _resizing_enabled; } | |
| 249 void set_resizing_enabled(bool enable) { _resizing_enabled = enable; } | |
| 250 | |
| 251 // debugging | |
| 252 void print_memory_usage(); | |
| 253 void compute_next_trace_threshold(); | |
| 254 | |
| 255 public: | |
| 256 | |
| 257 // create a JvmtiTagHashmap of a preferred size and optionally a load factor. | |
| 258 // The preferred size is rounded down to an actual size. | |
| 259 JvmtiTagHashmap(int size, float load_factor=0.0f) { | |
| 260 int i=0; | |
| 261 while (_sizes[i] < size) { | |
| 262 if (_sizes[i] < 0) { | |
| 263 assert(i > 0, "sanity check"); | |
| 264 i--; | |
| 265 break; | |
| 266 } | |
| 267 i++; | |
| 268 } | |
| 269 | |
| 270 // if a load factor is specified then use it, otherwise use default | |
| 271 if (load_factor > 0.01f) { | |
| 272 init(i, load_factor); | |
| 273 } else { | |
| 274 init(i); | |
| 275 } | |
| 276 } | |
| 277 | |
| 278 // create a JvmtiTagHashmap with default settings | |
| 279 JvmtiTagHashmap() { | |
| 280 init(); | |
| 281 } | |
| 282 | |
| 283 // release table when JvmtiTagHashmap destroyed | |
| 284 ~JvmtiTagHashmap() { | |
| 285 if (_table != NULL) { | |
| 286 os::free((void*)_table); | |
| 287 _table = NULL; | |
| 288 } | |
| 289 } | |
| 290 | |
| 291 // accessors | |
| 292 int size() const { return _size; } | |
| 293 JvmtiTagHashmapEntry** table() const { return _table; } | |
| 294 int entry_count() const { return _entry_count; } | |
| 295 | |
| 296 // find an entry in the hashmap, returns NULL if not found. | |
| 297 inline JvmtiTagHashmapEntry* find(oop key) { | |
| 298 unsigned int h = hash(key); | |
| 299 JvmtiTagHashmapEntry* entry = _table[h]; | |
| 300 while (entry != NULL) { | |
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301 if (entry->object() == key) { |
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302 return entry; |
| 0 | 303 } |
| 304 entry = entry->next(); | |
| 305 } | |
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306 return NULL; |
| 0 | 307 } |
| 308 | |
| 309 | |
| 310 // add a new entry to hashmap | |
| 311 inline void add(oop key, JvmtiTagHashmapEntry* entry) { | |
| 312 assert(key != NULL, "checking"); | |
| 313 assert(find(key) == NULL, "duplicate detected"); | |
| 314 unsigned int h = hash(key); | |
| 315 JvmtiTagHashmapEntry* anchor = _table[h]; | |
| 316 if (anchor == NULL) { | |
| 317 _table[h] = entry; | |
| 318 entry->set_next(NULL); | |
| 319 } else { | |
| 320 entry->set_next(anchor); | |
| 321 _table[h] = entry; | |
| 322 } | |
| 323 | |
| 324 _entry_count++; | |
| 325 if (trace_threshold() > 0 && entry_count() >= trace_threshold()) { | |
| 326 assert(TraceJVMTIObjectTagging, "should only get here when tracing"); | |
| 327 print_memory_usage(); | |
| 328 compute_next_trace_threshold(); | |
| 329 } | |
| 330 | |
| 331 // if the number of entries exceed the threshold then resize | |
| 332 if (entry_count() > resize_threshold() && is_resizing_enabled()) { | |
| 333 resize(); | |
| 334 } | |
| 335 } | |
| 336 | |
| 337 // remove an entry with the given key. | |
| 338 inline JvmtiTagHashmapEntry* remove(oop key) { | |
| 339 unsigned int h = hash(key); | |
| 340 JvmtiTagHashmapEntry* entry = _table[h]; | |
| 341 JvmtiTagHashmapEntry* prev = NULL; | |
| 342 while (entry != NULL) { | |
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343 if (key == entry->object()) { |
| 0 | 344 break; |
| 345 } | |
| 346 prev = entry; | |
| 347 entry = entry->next(); | |
| 348 } | |
| 349 if (entry != NULL) { | |
| 350 remove(prev, h, entry); | |
| 351 } | |
| 352 return entry; | |
| 353 } | |
| 354 | |
| 355 // iterate over all entries in the hashmap | |
| 356 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); | |
| 357 }; | |
| 358 | |
| 359 // possible hashmap sizes - odd primes that roughly double in size. | |
| 360 // To avoid excessive resizing the odd primes from 4801-76831 and | |
| 361 // 76831-307261 have been removed. The list must be terminated by -1. | |
| 362 int JvmtiTagHashmap::_sizes[] = { 4801, 76831, 307261, 614563, 1228891, | |
| 363 2457733, 4915219, 9830479, 19660831, 39321619, 78643219, -1 }; | |
| 364 | |
| 365 | |
| 366 // A supporting class for iterating over all entries in Hashmap | |
| 367 class JvmtiTagHashmapEntryClosure { | |
| 368 public: | |
| 369 virtual void do_entry(JvmtiTagHashmapEntry* entry) = 0; | |
| 370 }; | |
| 371 | |
| 372 | |
| 373 // iterate over all entries in the hashmap | |
| 374 void JvmtiTagHashmap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
| 375 for (int i=0; i<_size; i++) { | |
| 376 JvmtiTagHashmapEntry* entry = _table[i]; | |
| 377 JvmtiTagHashmapEntry* prev = NULL; | |
| 378 while (entry != NULL) { | |
| 379 // obtain the next entry before invoking do_entry - this is | |
| 380 // necessary because do_entry may remove the entry from the | |
| 381 // hashmap. | |
| 382 JvmtiTagHashmapEntry* next = entry->next(); | |
| 383 closure->do_entry(entry); | |
| 384 entry = next; | |
| 385 } | |
| 386 } | |
| 387 } | |
| 388 | |
| 389 // debugging | |
| 390 void JvmtiTagHashmap::print_memory_usage() { | |
| 391 intptr_t p = (intptr_t)this; | |
| 392 tty->print("[JvmtiTagHashmap @ " INTPTR_FORMAT, p); | |
| 393 | |
| 394 // table + entries in KB | |
| 395 int hashmap_usage = (size()*sizeof(JvmtiTagHashmapEntry*) + | |
| 396 entry_count()*sizeof(JvmtiTagHashmapEntry))/K; | |
| 397 | |
| 398 int weak_globals_usage = (int)(JNIHandles::weak_global_handle_memory_usage()/K); | |
| 399 tty->print_cr(", %d entries (%d KB) <JNI weak globals: %d KB>]", | |
| 400 entry_count(), hashmap_usage, weak_globals_usage); | |
| 401 } | |
| 402 | |
| 403 // compute threshold for the next trace message | |
| 404 void JvmtiTagHashmap::compute_next_trace_threshold() { | |
| 405 if (trace_threshold() < medium_trace_threshold) { | |
| 406 _trace_threshold += small_trace_threshold; | |
| 407 } else { | |
| 408 if (trace_threshold() < large_trace_threshold) { | |
| 409 _trace_threshold += medium_trace_threshold; | |
| 410 } else { | |
| 411 _trace_threshold += large_trace_threshold; | |
| 412 } | |
| 413 } | |
| 414 } | |
| 415 | |
| 416 // create a JvmtiTagMap | |
| 417 JvmtiTagMap::JvmtiTagMap(JvmtiEnv* env) : | |
| 418 _env(env), | |
| 419 _lock(Mutex::nonleaf+2, "JvmtiTagMap._lock", false), | |
| 420 _free_entries(NULL), | |
| 421 _free_entries_count(0) | |
| 422 { | |
| 423 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 424 assert(((JvmtiEnvBase *)env)->tag_map() == NULL, "tag map already exists for environment"); | |
| 425 | |
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426 _hashmap = new JvmtiTagHashmap(); |
| 0 | 427 |
| 428 // finally add us to the environment | |
| 429 ((JvmtiEnvBase *)env)->set_tag_map(this); | |
| 430 } | |
| 431 | |
| 432 | |
| 433 // destroy a JvmtiTagMap | |
| 434 JvmtiTagMap::~JvmtiTagMap() { | |
| 435 | |
| 436 // no lock acquired as we assume the enclosing environment is | |
| 437 // also being destroryed. | |
| 438 ((JvmtiEnvBase *)_env)->set_tag_map(NULL); | |
| 439 | |
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440 JvmtiTagHashmapEntry** table = _hashmap->table(); |
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441 for (int j = 0; j < _hashmap->size(); j++) { |
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442 JvmtiTagHashmapEntry* entry = table[j]; |
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443 while (entry != NULL) { |
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444 JvmtiTagHashmapEntry* next = entry->next(); |
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445 delete entry; |
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446 entry = next; |
| 0 | 447 } |
| 448 } | |
| 449 | |
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450 // finally destroy the hashmap |
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451 delete _hashmap; |
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452 _hashmap = NULL; |
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453 |
| 0 | 454 // remove any entries on the free list |
| 455 JvmtiTagHashmapEntry* entry = _free_entries; | |
| 456 while (entry != NULL) { | |
| 457 JvmtiTagHashmapEntry* next = entry->next(); | |
| 458 delete entry; | |
| 459 entry = next; | |
| 460 } | |
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461 _free_entries = NULL; |
| 0 | 462 } |
| 463 | |
| 464 // create a hashmap entry | |
| 465 // - if there's an entry on the (per-environment) free list then this | |
| 466 // is returned. Otherwise an new entry is allocated. | |
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467 JvmtiTagHashmapEntry* JvmtiTagMap::create_entry(oop ref, jlong tag) { |
| 0 | 468 assert(Thread::current()->is_VM_thread() || is_locked(), "checking"); |
| 469 JvmtiTagHashmapEntry* entry; | |
| 470 if (_free_entries == NULL) { | |
| 471 entry = new JvmtiTagHashmapEntry(ref, tag); | |
| 472 } else { | |
| 473 assert(_free_entries_count > 0, "mismatched _free_entries_count"); | |
| 474 _free_entries_count--; | |
| 475 entry = _free_entries; | |
| 476 _free_entries = entry->next(); | |
| 477 entry->init(ref, tag); | |
| 478 } | |
| 479 return entry; | |
| 480 } | |
| 481 | |
| 482 // destroy an entry by returning it to the free list | |
| 483 void JvmtiTagMap::destroy_entry(JvmtiTagHashmapEntry* entry) { | |
| 484 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
| 485 // limit the size of the free list | |
| 486 if (_free_entries_count >= max_free_entries) { | |
| 487 delete entry; | |
| 488 } else { | |
| 489 entry->set_next(_free_entries); | |
| 490 _free_entries = entry; | |
| 491 _free_entries_count++; | |
| 492 } | |
| 493 } | |
| 494 | |
| 495 // returns the tag map for the given environments. If the tag map | |
| 496 // doesn't exist then it is created. | |
| 497 JvmtiTagMap* JvmtiTagMap::tag_map_for(JvmtiEnv* env) { | |
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498 JvmtiTagMap* tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
| 0 | 499 if (tag_map == NULL) { |
| 500 MutexLocker mu(JvmtiThreadState_lock); | |
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501 tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
| 0 | 502 if (tag_map == NULL) { |
| 503 tag_map = new JvmtiTagMap(env); | |
| 504 } | |
| 505 } else { | |
| 506 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
| 507 } | |
| 508 return tag_map; | |
| 509 } | |
| 510 | |
| 511 // iterate over all entries in the tag map. | |
| 512 void JvmtiTagMap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
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513 hashmap()->entry_iterate(closure); |
| 0 | 514 } |
| 515 | |
| 516 // returns true if the hashmaps are empty | |
| 517 bool JvmtiTagMap::is_empty() { | |
| 518 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
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519 return hashmap()->entry_count() == 0; |
| 0 | 520 } |
| 521 | |
| 522 | |
| 523 // Return the tag value for an object, or 0 if the object is | |
| 524 // not tagged | |
| 525 // | |
| 526 static inline jlong tag_for(JvmtiTagMap* tag_map, oop o) { | |
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527 JvmtiTagHashmapEntry* entry = tag_map->hashmap()->find(o); |
| 0 | 528 if (entry == NULL) { |
| 529 return 0; | |
| 530 } else { | |
| 531 return entry->tag(); | |
| 532 } | |
| 533 } | |
| 534 | |
| 535 // If the object is a java.lang.Class then return the klassOop, | |
| 536 // otherwise return the original object | |
| 537 static inline oop klassOop_if_java_lang_Class(oop o) { | |
| 1142 | 538 if (o->klass() == SystemDictionary::Class_klass()) { |
| 0 | 539 if (!java_lang_Class::is_primitive(o)) { |
| 540 o = (oop)java_lang_Class::as_klassOop(o); | |
| 541 assert(o != NULL, "class for non-primitive mirror must exist"); | |
| 542 } | |
| 543 } | |
| 544 return o; | |
| 545 } | |
| 546 | |
| 547 // A CallbackWrapper is a support class for querying and tagging an object | |
| 548 // around a callback to a profiler. The constructor does pre-callback | |
| 549 // work to get the tag value, klass tag value, ... and the destructor | |
| 550 // does the post-callback work of tagging or untagging the object. | |
| 551 // | |
| 552 // { | |
| 553 // CallbackWrapper wrapper(tag_map, o); | |
| 554 // | |
| 555 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
| 556 // | |
| 557 // } // wrapper goes out of scope here which results in the destructor | |
| 558 // checking to see if the object has been tagged, untagged, or the | |
| 559 // tag value has changed. | |
| 560 // | |
| 561 class CallbackWrapper : public StackObj { | |
| 562 private: | |
| 563 JvmtiTagMap* _tag_map; | |
| 564 JvmtiTagHashmap* _hashmap; | |
| 565 JvmtiTagHashmapEntry* _entry; | |
| 566 oop _o; | |
| 567 jlong _obj_size; | |
| 568 jlong _obj_tag; | |
| 569 klassOop _klass; // the object's class | |
| 570 jlong _klass_tag; | |
| 571 | |
| 572 protected: | |
| 573 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 574 | |
| 575 // invoked post-callback to tag, untag, or update the tag of an object | |
| 576 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
| 577 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
| 578 public: | |
| 579 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
| 580 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
| 581 "MT unsafe or must be VM thread"); | |
| 582 | |
| 583 // for Classes the klassOop is tagged | |
| 584 _o = klassOop_if_java_lang_Class(o); | |
| 585 | |
| 586 // object size | |
| 587 _obj_size = _o->size() * wordSize; | |
| 588 | |
| 589 // record the context | |
| 590 _tag_map = tag_map; | |
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591 _hashmap = tag_map->hashmap(); |
| 0 | 592 _entry = _hashmap->find(_o); |
| 593 | |
| 594 // get object tag | |
| 595 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
| 596 | |
| 597 // get the class and the class's tag value | |
| 598 if (_o == o) { | |
| 599 _klass = _o->klass(); | |
| 600 } else { | |
| 601 // if the object represents a runtime class then use the | |
| 602 // tag for java.lang.Class | |
| 1142 | 603 _klass = SystemDictionary::Class_klass(); |
| 0 | 604 } |
| 605 _klass_tag = tag_for(tag_map, _klass); | |
| 606 } | |
| 607 | |
| 608 ~CallbackWrapper() { | |
| 609 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
| 610 } | |
| 611 | |
| 612 inline jlong* obj_tag_p() { return &_obj_tag; } | |
| 613 inline jlong obj_size() const { return _obj_size; } | |
| 614 inline jlong obj_tag() const { return _obj_tag; } | |
| 615 inline klassOop klass() const { return _klass; } | |
| 616 inline jlong klass_tag() const { return _klass_tag; } | |
| 617 }; | |
| 618 | |
| 619 | |
| 620 | |
| 621 // callback post-callback to tag, untag, or update the tag of an object | |
| 622 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
| 623 JvmtiTagHashmap* hashmap, | |
| 624 JvmtiTagHashmapEntry* entry, | |
| 625 jlong obj_tag) { | |
| 626 if (entry == NULL) { | |
| 627 if (obj_tag != 0) { | |
| 628 // callback has tagged the object | |
| 629 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
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630 entry = tag_map()->create_entry(o, obj_tag); |
| 0 | 631 hashmap->add(o, entry); |
| 632 } | |
| 633 } else { | |
| 634 // object was previously tagged - the callback may have untagged | |
| 635 // the object or changed the tag value | |
| 636 if (obj_tag == 0) { | |
| 637 | |
| 638 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
| 639 assert(entry_removed == entry, "checking"); | |
| 640 tag_map()->destroy_entry(entry); | |
| 641 | |
| 642 } else { | |
| 643 if (obj_tag != entry->tag()) { | |
| 644 entry->set_tag(obj_tag); | |
| 645 } | |
| 646 } | |
| 647 } | |
| 648 } | |
| 649 | |
| 650 // An extended CallbackWrapper used when reporting an object reference | |
| 651 // to the agent. | |
| 652 // | |
| 653 // { | |
| 654 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
| 655 // | |
| 656 // (*callback)(wrapper.klass_tag(), | |
| 657 // wrapper.obj_size(), | |
| 658 // wrapper.obj_tag_p() | |
| 659 // wrapper.referrer_tag_p(), ...) | |
| 660 // | |
| 661 // } // wrapper goes out of scope here which results in the destructor | |
| 662 // checking to see if the referrer object has been tagged, untagged, | |
| 663 // or the tag value has changed. | |
| 664 // | |
| 665 class TwoOopCallbackWrapper : public CallbackWrapper { | |
| 666 private: | |
| 667 bool _is_reference_to_self; | |
| 668 JvmtiTagHashmap* _referrer_hashmap; | |
| 669 JvmtiTagHashmapEntry* _referrer_entry; | |
| 670 oop _referrer; | |
| 671 jlong _referrer_obj_tag; | |
| 672 jlong _referrer_klass_tag; | |
| 673 jlong* _referrer_tag_p; | |
| 674 | |
| 675 bool is_reference_to_self() const { return _is_reference_to_self; } | |
| 676 | |
| 677 public: | |
| 678 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
| 679 CallbackWrapper(tag_map, o) | |
| 680 { | |
| 681 // self reference needs to be handled in a special way | |
| 682 _is_reference_to_self = (referrer == o); | |
| 683 | |
| 684 if (_is_reference_to_self) { | |
| 685 _referrer_klass_tag = klass_tag(); | |
| 686 _referrer_tag_p = obj_tag_p(); | |
| 687 } else { | |
| 688 // for Classes the klassOop is tagged | |
| 689 _referrer = klassOop_if_java_lang_Class(referrer); | |
| 690 // record the context | |
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691 _referrer_hashmap = tag_map->hashmap(); |
| 0 | 692 _referrer_entry = _referrer_hashmap->find(_referrer); |
| 693 | |
| 694 // get object tag | |
| 695 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
| 696 _referrer_tag_p = &_referrer_obj_tag; | |
| 697 | |
| 698 // get referrer class tag. | |
| 699 klassOop k = (_referrer == referrer) ? // Check if referrer is a class... | |
| 700 _referrer->klass() // No, just get its class | |
| 1142 | 701 : SystemDictionary::Class_klass(); // Yes, its class is Class |
| 0 | 702 _referrer_klass_tag = tag_for(tag_map, k); |
| 703 } | |
| 704 } | |
| 705 | |
| 706 ~TwoOopCallbackWrapper() { | |
| 707 if (!is_reference_to_self()){ | |
| 708 post_callback_tag_update(_referrer, | |
| 709 _referrer_hashmap, | |
| 710 _referrer_entry, | |
| 711 _referrer_obj_tag); | |
| 712 } | |
| 713 } | |
| 714 | |
| 715 // address of referrer tag | |
| 716 // (for a self reference this will return the same thing as obj_tag_p()) | |
| 717 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
| 718 | |
| 719 // referrer's class tag | |
| 720 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
| 721 }; | |
| 722 | |
| 723 // tag an object | |
| 724 // | |
| 725 // This function is performance critical. If many threads attempt to tag objects | |
| 726 // around the same time then it's possible that the Mutex associated with the | |
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727 // tag map will be a hot lock. |
| 0 | 728 void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
| 729 MutexLocker ml(lock()); | |
| 730 | |
| 731 // resolve the object | |
| 732 oop o = JNIHandles::resolve_non_null(object); | |
| 733 | |
| 734 // for Classes we tag the klassOop | |
| 735 o = klassOop_if_java_lang_Class(o); | |
| 736 | |
| 737 // see if the object is already tagged | |
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738 JvmtiTagHashmap* hashmap = _hashmap; |
| 0 | 739 JvmtiTagHashmapEntry* entry = hashmap->find(o); |
| 740 | |
| 741 // if the object is not already tagged then we tag it | |
| 742 if (entry == NULL) { | |
| 743 if (tag != 0) { | |
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744 entry = create_entry(o, tag); |
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745 hashmap->add(o, entry); |
| 0 | 746 } else { |
| 747 // no-op | |
| 748 } | |
| 749 } else { | |
| 750 // if the object is already tagged then we either update | |
| 751 // the tag (if a new tag value has been provided) | |
| 752 // or remove the object if the new tag value is 0. | |
| 753 if (tag == 0) { | |
| 754 hashmap->remove(o); | |
| 755 destroy_entry(entry); | |
| 756 } else { | |
| 757 entry->set_tag(tag); | |
| 758 } | |
| 759 } | |
| 760 } | |
| 761 | |
| 762 // get the tag for an object | |
| 763 jlong JvmtiTagMap::get_tag(jobject object) { | |
| 764 MutexLocker ml(lock()); | |
| 765 | |
| 766 // resolve the object | |
| 767 oop o = JNIHandles::resolve_non_null(object); | |
| 768 | |
| 769 // for Classes get the tag from the klassOop | |
| 770 return tag_for(this, klassOop_if_java_lang_Class(o)); | |
| 771 } | |
| 772 | |
| 773 | |
| 774 // Helper class used to describe the static or instance fields of a class. | |
| 775 // For each field it holds the field index (as defined by the JVMTI specification), | |
| 776 // the field type, and the offset. | |
| 777 | |
| 778 class ClassFieldDescriptor: public CHeapObj { | |
| 779 private: | |
| 780 int _field_index; | |
| 781 int _field_offset; | |
| 782 char _field_type; | |
| 783 public: | |
| 784 ClassFieldDescriptor(int index, char type, int offset) : | |
| 785 _field_index(index), _field_type(type), _field_offset(offset) { | |
| 786 } | |
| 787 int field_index() const { return _field_index; } | |
| 788 char field_type() const { return _field_type; } | |
| 789 int field_offset() const { return _field_offset; } | |
| 790 }; | |
| 791 | |
| 792 class ClassFieldMap: public CHeapObj { | |
| 793 private: | |
| 794 enum { | |
| 795 initial_field_count = 5 | |
| 796 }; | |
| 797 | |
| 798 // list of field descriptors | |
| 799 GrowableArray<ClassFieldDescriptor*>* _fields; | |
| 800 | |
| 801 // constructor | |
| 802 ClassFieldMap(); | |
| 803 | |
| 804 // add a field | |
| 805 void add(int index, char type, int offset); | |
| 806 | |
| 807 // returns the field count for the given class | |
| 808 static int compute_field_count(instanceKlassHandle ikh); | |
| 809 | |
| 810 public: | |
| 811 ~ClassFieldMap(); | |
| 812 | |
| 813 // access | |
| 814 int field_count() { return _fields->length(); } | |
| 815 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
| 816 | |
| 817 // functions to create maps of static or instance fields | |
| 818 static ClassFieldMap* create_map_of_static_fields(klassOop k); | |
| 819 static ClassFieldMap* create_map_of_instance_fields(oop obj); | |
| 820 }; | |
| 821 | |
| 822 ClassFieldMap::ClassFieldMap() { | |
| 823 _fields = new (ResourceObj::C_HEAP) GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
| 824 } | |
| 825 | |
| 826 ClassFieldMap::~ClassFieldMap() { | |
| 827 for (int i=0; i<_fields->length(); i++) { | |
| 828 delete _fields->at(i); | |
| 829 } | |
| 830 delete _fields; | |
| 831 } | |
| 832 | |
| 833 void ClassFieldMap::add(int index, char type, int offset) { | |
| 834 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
| 835 _fields->append(field); | |
| 836 } | |
| 837 | |
| 838 // Returns a heap allocated ClassFieldMap to describe the static fields | |
| 839 // of the given class. | |
| 840 // | |
| 841 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(klassOop k) { | |
| 842 HandleMark hm; | |
| 843 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
| 844 | |
| 845 // create the field map | |
| 846 ClassFieldMap* field_map = new ClassFieldMap(); | |
| 847 | |
| 848 FilteredFieldStream f(ikh, false, false); | |
| 849 int max_field_index = f.field_count()-1; | |
| 850 | |
| 851 int index = 0; | |
| 852 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
| 853 // ignore instance fields | |
| 854 if (!fld.access_flags().is_static()) { | |
| 855 continue; | |
| 856 } | |
| 857 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
| 858 } | |
| 859 return field_map; | |
| 860 } | |
| 861 | |
| 862 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
| 863 // of the given class. All instance fields are included (this means public | |
| 864 // and private fields declared in superclasses and superinterfaces too). | |
| 865 // | |
| 866 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
| 867 HandleMark hm; | |
| 868 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
| 869 | |
| 870 // create the field map | |
| 871 ClassFieldMap* field_map = new ClassFieldMap(); | |
| 872 | |
| 873 FilteredFieldStream f(ikh, false, false); | |
| 874 | |
| 875 int max_field_index = f.field_count()-1; | |
| 876 | |
| 877 int index = 0; | |
| 878 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
| 879 // ignore static fields | |
| 880 if (fld.access_flags().is_static()) { | |
| 881 continue; | |
| 882 } | |
| 883 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
| 884 } | |
| 885 | |
| 886 return field_map; | |
| 887 } | |
| 888 | |
| 889 // Helper class used to cache a ClassFileMap for the instance fields of | |
| 890 // a cache. A JvmtiCachedClassFieldMap can be cached by an instanceKlass during | |
| 891 // heap iteration and avoid creating a field map for each object in the heap | |
| 892 // (only need to create the map when the first instance of a class is encountered). | |
| 893 // | |
| 894 class JvmtiCachedClassFieldMap : public CHeapObj { | |
| 895 private: | |
| 896 enum { | |
| 897 initial_class_count = 200 | |
| 898 }; | |
| 899 ClassFieldMap* _field_map; | |
| 900 | |
| 901 ClassFieldMap* field_map() const { return _field_map; } | |
| 902 | |
| 903 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
| 904 ~JvmtiCachedClassFieldMap(); | |
| 905 | |
| 906 static GrowableArray<instanceKlass*>* _class_list; | |
| 907 static void add_to_class_list(instanceKlass* ik); | |
| 908 | |
| 909 public: | |
| 910 // returns the field map for a given object (returning map cached | |
| 911 // by instanceKlass if possible | |
| 912 static ClassFieldMap* get_map_of_instance_fields(oop obj); | |
| 913 | |
| 914 // removes the field map from all instanceKlasses - should be | |
| 915 // called before VM operation completes | |
| 916 static void clear_cache(); | |
| 917 | |
| 918 // returns the number of ClassFieldMap cached by instanceKlasses | |
| 919 static int cached_field_map_count(); | |
| 920 }; | |
| 921 | |
| 922 GrowableArray<instanceKlass*>* JvmtiCachedClassFieldMap::_class_list; | |
| 923 | |
| 924 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
| 925 _field_map = field_map; | |
| 926 } | |
| 927 | |
| 928 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
| 929 if (_field_map != NULL) { | |
| 930 delete _field_map; | |
| 931 } | |
| 932 } | |
| 933 | |
| 934 // Marker class to ensure that the class file map cache is only used in a defined | |
| 935 // scope. | |
| 936 class ClassFieldMapCacheMark : public StackObj { | |
| 937 private: | |
| 938 static bool _is_active; | |
| 939 public: | |
| 940 ClassFieldMapCacheMark() { | |
| 941 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 942 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
| 943 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
| 944 _is_active = true; | |
| 945 } | |
| 946 ~ClassFieldMapCacheMark() { | |
| 947 JvmtiCachedClassFieldMap::clear_cache(); | |
| 948 _is_active = false; | |
| 949 } | |
| 950 static bool is_active() { return _is_active; } | |
| 951 }; | |
| 952 | |
| 953 bool ClassFieldMapCacheMark::_is_active; | |
| 954 | |
| 955 | |
| 956 // record that the given instanceKlass is caching a field map | |
| 957 void JvmtiCachedClassFieldMap::add_to_class_list(instanceKlass* ik) { | |
| 958 if (_class_list == NULL) { | |
| 959 _class_list = new (ResourceObj::C_HEAP) GrowableArray<instanceKlass*>(initial_class_count, true); | |
| 960 } | |
| 961 _class_list->push(ik); | |
| 962 } | |
| 963 | |
| 964 // returns the instance field map for the given object | |
| 965 // (returns field map cached by the instanceKlass if possible) | |
| 966 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { | |
| 967 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 968 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
| 969 | |
| 970 klassOop k = obj->klass(); | |
| 971 instanceKlass* ik = instanceKlass::cast(k); | |
| 972 | |
| 973 // return cached map if possible | |
| 974 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
| 975 if (cached_map != NULL) { | |
| 976 assert(cached_map->field_map() != NULL, "missing field list"); | |
| 977 return cached_map->field_map(); | |
| 978 } else { | |
| 979 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
| 980 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
| 981 ik->set_jvmti_cached_class_field_map(cached_map); | |
| 982 add_to_class_list(ik); | |
| 983 return field_map; | |
| 984 } | |
| 985 } | |
| 986 | |
| 987 // remove the fields maps cached from all instanceKlasses | |
| 988 void JvmtiCachedClassFieldMap::clear_cache() { | |
| 989 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 990 if (_class_list != NULL) { | |
| 991 for (int i = 0; i < _class_list->length(); i++) { | |
| 992 instanceKlass* ik = _class_list->at(i); | |
| 993 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
| 994 assert(cached_map != NULL, "should not be NULL"); | |
| 995 ik->set_jvmti_cached_class_field_map(NULL); | |
| 996 delete cached_map; // deletes the encapsulated field map | |
| 997 } | |
| 998 delete _class_list; | |
| 999 _class_list = NULL; | |
| 1000 } | |
| 1001 } | |
| 1002 | |
| 1003 // returns the number of ClassFieldMap cached by instanceKlasses | |
| 1004 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
| 1005 return (_class_list == NULL) ? 0 : _class_list->length(); | |
| 1006 } | |
| 1007 | |
| 1008 // helper function to indicate if an object is filtered by its tag or class tag | |
| 1009 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
| 1010 jlong klass_tag, | |
| 1011 int heap_filter) { | |
| 1012 // apply the heap filter | |
| 1013 if (obj_tag != 0) { | |
| 1014 // filter out tagged objects | |
| 1015 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
| 1016 } else { | |
| 1017 // filter out untagged objects | |
| 1018 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
| 1019 } | |
| 1020 if (klass_tag != 0) { | |
| 1021 // filter out objects with tagged classes | |
| 1022 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
| 1023 } else { | |
| 1024 // filter out objects with untagged classes. | |
| 1025 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
| 1026 } | |
| 1027 return false; | |
| 1028 } | |
| 1029 | |
| 1030 // helper function to indicate if an object is filtered by a klass filter | |
| 1031 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
| 1032 if (!klass_filter.is_null()) { | |
| 1033 if (obj->klass() != klass_filter()) { | |
| 1034 return true; | |
| 1035 } | |
| 1036 } | |
| 1037 return false; | |
| 1038 } | |
| 1039 | |
| 1040 // helper function to tell if a field is a primitive field or not | |
| 1041 static inline bool is_primitive_field_type(char type) { | |
| 1042 return (type != 'L' && type != '['); | |
| 1043 } | |
| 1044 | |
| 1045 // helper function to copy the value from location addr to jvalue. | |
| 1046 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
| 1047 switch (value_type) { | |
| 1048 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
| 1049 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
| 1050 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
| 1051 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
| 1052 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
| 1053 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
| 1054 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
| 1055 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
| 1056 default: ShouldNotReachHere(); | |
| 1057 } | |
| 1058 } | |
| 1059 | |
| 1060 // helper function to invoke string primitive value callback | |
| 1061 // returns visit control flags | |
| 1062 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
| 1063 CallbackWrapper* wrapper, | |
| 1064 oop str, | |
| 1065 void* user_data) | |
| 1066 { | |
| 1142 | 1067 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
| 0 | 1068 |
| 1069 // get the string value and length | |
| 1070 // (string value may be offset from the base) | |
| 1071 int s_len = java_lang_String::length(str); | |
| 1072 typeArrayOop s_value = java_lang_String::value(str); | |
| 1073 int s_offset = java_lang_String::offset(str); | |
| 1074 jchar* value; | |
| 1075 if (s_len > 0) { | |
| 1076 value = s_value->char_at_addr(s_offset); | |
| 1077 } else { | |
| 1078 value = (jchar*) s_value->base(T_CHAR); | |
| 1079 } | |
| 1080 | |
| 1081 // invoke the callback | |
| 1082 return (*cb)(wrapper->klass_tag(), | |
| 1083 wrapper->obj_size(), | |
| 1084 wrapper->obj_tag_p(), | |
| 1085 value, | |
| 1086 (jint)s_len, | |
| 1087 user_data); | |
| 1088 } | |
| 1089 | |
| 1090 // helper function to invoke string primitive value callback | |
| 1091 // returns visit control flags | |
| 1092 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
| 1093 CallbackWrapper* wrapper, | |
| 1094 oop obj, | |
| 1095 void* user_data) | |
| 1096 { | |
| 1097 assert(obj->is_typeArray(), "not a primitive array"); | |
| 1098 | |
| 1099 // get base address of first element | |
| 1100 typeArrayOop array = typeArrayOop(obj); | |
| 1101 BasicType type = typeArrayKlass::cast(array->klass())->element_type(); | |
| 1102 void* elements = array->base(type); | |
| 1103 | |
| 1104 // jvmtiPrimitiveType is defined so this mapping is always correct | |
| 1105 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
| 1106 | |
| 1107 return (*cb)(wrapper->klass_tag(), | |
| 1108 wrapper->obj_size(), | |
| 1109 wrapper->obj_tag_p(), | |
| 1110 (jint)array->length(), | |
| 1111 elem_type, | |
| 1112 elements, | |
| 1113 user_data); | |
| 1114 } | |
| 1115 | |
| 1116 // helper function to invoke the primitive field callback for all static fields | |
| 1117 // of a given class | |
| 1118 static jint invoke_primitive_field_callback_for_static_fields | |
| 1119 (CallbackWrapper* wrapper, | |
| 1120 oop obj, | |
| 1121 jvmtiPrimitiveFieldCallback cb, | |
| 1122 void* user_data) | |
| 1123 { | |
| 1124 // for static fields only the index will be set | |
| 1125 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 1126 | |
| 1142 | 1127 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
| 0 | 1128 if (java_lang_Class::is_primitive(obj)) { |
| 1129 return 0; | |
| 1130 } | |
| 1131 klassOop k = java_lang_Class::as_klassOop(obj); | |
| 1132 Klass* klass = k->klass_part(); | |
| 1133 | |
| 1134 // ignore classes for object and type arrays | |
| 1135 if (!klass->oop_is_instance()) { | |
| 1136 return 0; | |
| 1137 } | |
| 1138 | |
| 1139 // ignore classes which aren't linked yet | |
| 1140 instanceKlass* ik = instanceKlass::cast(k); | |
| 1141 if (!ik->is_linked()) { | |
| 1142 return 0; | |
| 1143 } | |
| 1144 | |
| 1145 // get the field map | |
| 1146 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
| 1147 | |
| 1148 // invoke the callback for each static primitive field | |
| 1149 for (int i=0; i<field_map->field_count(); i++) { | |
| 1150 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 1151 | |
| 1152 // ignore non-primitive fields | |
| 1153 char type = field->field_type(); | |
| 1154 if (!is_primitive_field_type(type)) { | |
| 1155 continue; | |
| 1156 } | |
| 1157 // one-to-one mapping | |
| 1158 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 1159 | |
| 1160 // get offset and field value | |
| 1161 int offset = field->field_offset(); | |
| 1162 address addr = (address)k + offset; | |
| 1163 jvalue value; | |
| 1164 copy_to_jvalue(&value, addr, value_type); | |
| 1165 | |
| 1166 // field index | |
| 1167 reference_info.field.index = field->field_index(); | |
| 1168 | |
| 1169 // invoke the callback | |
| 1170 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
| 1171 &reference_info, | |
| 1172 wrapper->klass_tag(), | |
| 1173 wrapper->obj_tag_p(), | |
| 1174 value, | |
| 1175 value_type, | |
| 1176 user_data); | |
| 1177 if (res & JVMTI_VISIT_ABORT) { | |
| 1178 delete field_map; | |
| 1179 return res; | |
| 1180 } | |
| 1181 } | |
| 1182 | |
| 1183 delete field_map; | |
| 1184 return 0; | |
| 1185 } | |
| 1186 | |
| 1187 // helper function to invoke the primitive field callback for all instance fields | |
| 1188 // of a given object | |
| 1189 static jint invoke_primitive_field_callback_for_instance_fields( | |
| 1190 CallbackWrapper* wrapper, | |
| 1191 oop obj, | |
| 1192 jvmtiPrimitiveFieldCallback cb, | |
| 1193 void* user_data) | |
| 1194 { | |
| 1195 // for instance fields only the index will be set | |
| 1196 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 1197 | |
| 1198 // get the map of the instance fields | |
| 1199 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
| 1200 | |
| 1201 // invoke the callback for each instance primitive field | |
| 1202 for (int i=0; i<fields->field_count(); i++) { | |
| 1203 ClassFieldDescriptor* field = fields->field_at(i); | |
| 1204 | |
| 1205 // ignore non-primitive fields | |
| 1206 char type = field->field_type(); | |
| 1207 if (!is_primitive_field_type(type)) { | |
| 1208 continue; | |
| 1209 } | |
| 1210 // one-to-one mapping | |
| 1211 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 1212 | |
| 1213 // get offset and field value | |
| 1214 int offset = field->field_offset(); | |
| 1215 address addr = (address)obj + offset; | |
| 1216 jvalue value; | |
| 1217 copy_to_jvalue(&value, addr, value_type); | |
| 1218 | |
| 1219 // field index | |
| 1220 reference_info.field.index = field->field_index(); | |
| 1221 | |
| 1222 // invoke the callback | |
| 1223 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
| 1224 &reference_info, | |
| 1225 wrapper->klass_tag(), | |
| 1226 wrapper->obj_tag_p(), | |
| 1227 value, | |
| 1228 value_type, | |
| 1229 user_data); | |
| 1230 if (res & JVMTI_VISIT_ABORT) { | |
| 1231 return res; | |
| 1232 } | |
| 1233 } | |
| 1234 return 0; | |
| 1235 } | |
| 1236 | |
| 1237 | |
| 1238 // VM operation to iterate over all objects in the heap (both reachable | |
| 1239 // and unreachable) | |
| 1240 class VM_HeapIterateOperation: public VM_Operation { | |
| 1241 private: | |
| 1242 ObjectClosure* _blk; | |
| 1243 public: | |
| 1244 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
| 1245 | |
| 1246 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
| 1247 void doit() { | |
| 1248 // allows class files maps to be cached during iteration | |
| 1249 ClassFieldMapCacheMark cm; | |
| 1250 | |
| 1251 // make sure that heap is parsable (fills TLABs with filler objects) | |
| 1252 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
| 1253 | |
| 1254 // Verify heap before iteration - if the heap gets corrupted then | |
| 1255 // JVMTI's IterateOverHeap will crash. | |
| 1256 if (VerifyBeforeIteration) { | |
| 1257 Universe::verify(); | |
| 1258 } | |
| 1259 | |
| 1260 // do the iteration | |
|
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1261 // If this operation encounters a bad object when using CMS, |
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1262 // consider using safe_object_iterate() which avoids perm gen |
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1263 // objects that may contain bad references. |
| 0 | 1264 Universe::heap()->object_iterate(_blk); |
| 1265 | |
| 1266 // when sharing is enabled we must iterate over the shared spaces | |
| 1267 if (UseSharedSpaces) { | |
| 1268 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 1269 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
| 1270 gen->ro_space()->object_iterate(_blk); | |
| 1271 gen->rw_space()->object_iterate(_blk); | |
| 1272 } | |
| 1273 } | |
| 1274 | |
| 1275 }; | |
| 1276 | |
| 1277 | |
| 1278 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
| 1279 // IterateOverInstancesOfClass functions | |
| 1280 class IterateOverHeapObjectClosure: public ObjectClosure { | |
| 1281 private: | |
| 1282 JvmtiTagMap* _tag_map; | |
| 1283 KlassHandle _klass; | |
| 1284 jvmtiHeapObjectFilter _object_filter; | |
| 1285 jvmtiHeapObjectCallback _heap_object_callback; | |
| 1286 const void* _user_data; | |
| 1287 | |
| 1288 // accessors | |
| 1289 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 1290 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
| 1291 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
| 1292 KlassHandle klass() const { return _klass; } | |
| 1293 const void* user_data() const { return _user_data; } | |
| 1294 | |
| 1295 // indicates if iteration has been aborted | |
| 1296 bool _iteration_aborted; | |
| 1297 bool is_iteration_aborted() const { return _iteration_aborted; } | |
| 1298 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
| 1299 | |
| 1300 public: | |
| 1301 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
| 1302 KlassHandle klass, | |
| 1303 jvmtiHeapObjectFilter object_filter, | |
| 1304 jvmtiHeapObjectCallback heap_object_callback, | |
| 1305 const void* user_data) : | |
| 1306 _tag_map(tag_map), | |
| 1307 _klass(klass), | |
| 1308 _object_filter(object_filter), | |
| 1309 _heap_object_callback(heap_object_callback), | |
| 1310 _user_data(user_data), | |
| 1311 _iteration_aborted(false) | |
| 1312 { | |
| 1313 } | |
| 1314 | |
| 1315 void do_object(oop o); | |
| 1316 }; | |
| 1317 | |
| 1318 // invoked for each object in the heap | |
| 1319 void IterateOverHeapObjectClosure::do_object(oop o) { | |
| 1320 // check if iteration has been halted | |
| 1321 if (is_iteration_aborted()) return; | |
| 1322 | |
| 1323 // ignore any objects that aren't visible to profiler | |
| 1324 if (!ServiceUtil::visible_oop(o)) return; | |
| 1325 | |
| 1326 // instanceof check when filtering by klass | |
| 1327 if (!klass().is_null() && !o->is_a(klass()())) { | |
| 1328 return; | |
| 1329 } | |
| 1330 // prepare for the calllback | |
| 1331 CallbackWrapper wrapper(tag_map(), o); | |
| 1332 | |
| 1333 // if the object is tagged and we're only interested in untagged objects | |
| 1334 // then don't invoke the callback. Similiarly, if the object is untagged | |
| 1335 // and we're only interested in tagged objects we skip the callback. | |
| 1336 if (wrapper.obj_tag() != 0) { | |
| 1337 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
| 1338 } else { | |
| 1339 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
| 1340 } | |
| 1341 | |
| 1342 // invoke the agent's callback | |
| 1343 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
| 1344 wrapper.obj_size(), | |
| 1345 wrapper.obj_tag_p(), | |
| 1346 (void*)user_data()); | |
| 1347 if (control == JVMTI_ITERATION_ABORT) { | |
| 1348 set_iteration_aborted(true); | |
| 1349 } | |
| 1350 } | |
| 1351 | |
| 1352 // An ObjectClosure used to support the IterateThroughHeap function | |
| 1353 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
| 1354 private: | |
| 1355 JvmtiTagMap* _tag_map; | |
| 1356 KlassHandle _klass; | |
| 1357 int _heap_filter; | |
| 1358 const jvmtiHeapCallbacks* _callbacks; | |
| 1359 const void* _user_data; | |
| 1360 | |
| 1361 // accessor functions | |
| 1362 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 1363 int heap_filter() const { return _heap_filter; } | |
| 1364 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
| 1365 KlassHandle klass() const { return _klass; } | |
| 1366 const void* user_data() const { return _user_data; } | |
| 1367 | |
| 1368 // indicates if the iteration has been aborted | |
| 1369 bool _iteration_aborted; | |
| 1370 bool is_iteration_aborted() const { return _iteration_aborted; } | |
| 1371 | |
| 1372 // used to check the visit control flags. If the abort flag is set | |
| 1373 // then we set the iteration aborted flag so that the iteration completes | |
| 1374 // without processing any further objects | |
| 1375 bool check_flags_for_abort(jint flags) { | |
| 1376 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
| 1377 if (is_abort) { | |
| 1378 _iteration_aborted = true; | |
| 1379 } | |
| 1380 return is_abort; | |
| 1381 } | |
| 1382 | |
| 1383 public: | |
| 1384 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
| 1385 KlassHandle klass, | |
| 1386 int heap_filter, | |
| 1387 const jvmtiHeapCallbacks* heap_callbacks, | |
| 1388 const void* user_data) : | |
| 1389 _tag_map(tag_map), | |
| 1390 _klass(klass), | |
| 1391 _heap_filter(heap_filter), | |
| 1392 _callbacks(heap_callbacks), | |
| 1393 _user_data(user_data), | |
| 1394 _iteration_aborted(false) | |
| 1395 { | |
| 1396 } | |
| 1397 | |
| 1398 void do_object(oop o); | |
| 1399 }; | |
| 1400 | |
| 1401 // invoked for each object in the heap | |
| 1402 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
| 1403 // check if iteration has been halted | |
| 1404 if (is_iteration_aborted()) return; | |
| 1405 | |
| 1406 // ignore any objects that aren't visible to profiler | |
| 1407 if (!ServiceUtil::visible_oop(obj)) return; | |
| 1408 | |
| 1409 // apply class filter | |
| 1410 if (is_filtered_by_klass_filter(obj, klass())) return; | |
| 1411 | |
| 1412 // prepare for callback | |
| 1413 CallbackWrapper wrapper(tag_map(), obj); | |
| 1414 | |
| 1415 // check if filtered by the heap filter | |
| 1416 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
| 1417 return; | |
| 1418 } | |
| 1419 | |
| 1420 // for arrays we need the length, otherwise -1 | |
| 1421 bool is_array = obj->is_array(); | |
| 1422 int len = is_array ? arrayOop(obj)->length() : -1; | |
| 1423 | |
| 1424 // invoke the object callback (if callback is provided) | |
| 1425 if (callbacks()->heap_iteration_callback != NULL) { | |
| 1426 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
| 1427 jint res = (*cb)(wrapper.klass_tag(), | |
| 1428 wrapper.obj_size(), | |
| 1429 wrapper.obj_tag_p(), | |
| 1430 (jint)len, | |
| 1431 (void*)user_data()); | |
| 1432 if (check_flags_for_abort(res)) return; | |
| 1433 } | |
| 1434 | |
| 1435 // for objects and classes we report primitive fields if callback provided | |
| 1436 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
| 1437 jint res; | |
| 1438 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
| 1142 | 1439 if (obj->klass() == SystemDictionary::Class_klass()) { |
| 0 | 1440 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
| 1441 obj, | |
| 1442 cb, | |
| 1443 (void*)user_data()); | |
| 1444 } else { | |
| 1445 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
| 1446 obj, | |
| 1447 cb, | |
| 1448 (void*)user_data()); | |
| 1449 } | |
| 1450 if (check_flags_for_abort(res)) return; | |
| 1451 } | |
| 1452 | |
| 1453 // string callback | |
| 1454 if (!is_array && | |
| 1455 callbacks()->string_primitive_value_callback != NULL && | |
| 1142 | 1456 obj->klass() == SystemDictionary::String_klass()) { |
| 0 | 1457 jint res = invoke_string_value_callback( |
| 1458 callbacks()->string_primitive_value_callback, | |
| 1459 &wrapper, | |
| 1460 obj, | |
| 1461 (void*)user_data() ); | |
| 1462 if (check_flags_for_abort(res)) return; | |
| 1463 } | |
| 1464 | |
| 1465 // array callback | |
| 1466 if (is_array && | |
| 1467 callbacks()->array_primitive_value_callback != NULL && | |
| 1468 obj->is_typeArray()) { | |
| 1469 jint res = invoke_array_primitive_value_callback( | |
| 1470 callbacks()->array_primitive_value_callback, | |
| 1471 &wrapper, | |
| 1472 obj, | |
| 1473 (void*)user_data() ); | |
| 1474 if (check_flags_for_abort(res)) return; | |
| 1475 } | |
| 1476 }; | |
| 1477 | |
| 1478 | |
| 1479 // Deprecated function to iterate over all objects in the heap | |
| 1480 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
| 1481 KlassHandle klass, | |
| 1482 jvmtiHeapObjectCallback heap_object_callback, | |
| 1483 const void* user_data) | |
| 1484 { | |
| 1485 MutexLocker ml(Heap_lock); | |
| 1486 IterateOverHeapObjectClosure blk(this, | |
| 1487 klass, | |
| 1488 object_filter, | |
| 1489 heap_object_callback, | |
| 1490 user_data); | |
| 1491 VM_HeapIterateOperation op(&blk); | |
| 1492 VMThread::execute(&op); | |
| 1493 } | |
| 1494 | |
| 1495 | |
| 1496 // Iterates over all objects in the heap | |
| 1497 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
| 1498 KlassHandle klass, | |
| 1499 const jvmtiHeapCallbacks* callbacks, | |
| 1500 const void* user_data) | |
| 1501 { | |
| 1502 MutexLocker ml(Heap_lock); | |
| 1503 IterateThroughHeapObjectClosure blk(this, | |
| 1504 klass, | |
| 1505 heap_filter, | |
| 1506 callbacks, | |
| 1507 user_data); | |
| 1508 VM_HeapIterateOperation op(&blk); | |
| 1509 VMThread::execute(&op); | |
| 1510 } | |
| 1511 | |
| 1512 // support class for get_objects_with_tags | |
| 1513 | |
| 1514 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
| 1515 private: | |
| 1516 JvmtiEnv* _env; | |
| 1517 jlong* _tags; | |
| 1518 jint _tag_count; | |
| 1519 | |
| 1520 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
| 1521 GrowableArray<uint64_t>* _tag_results; // collected tags | |
| 1522 | |
| 1523 public: | |
| 1524 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
| 1525 _env = env; | |
| 1526 _tags = (jlong*)tags; | |
| 1527 _tag_count = tag_count; | |
| 1528 _object_results = new (ResourceObj::C_HEAP) GrowableArray<jobject>(1,true); | |
| 1529 _tag_results = new (ResourceObj::C_HEAP) GrowableArray<uint64_t>(1,true); | |
| 1530 } | |
| 1531 | |
| 1532 ~TagObjectCollector() { | |
| 1533 delete _object_results; | |
| 1534 delete _tag_results; | |
| 1535 } | |
| 1536 | |
| 1537 // for each tagged object check if the tag value matches | |
| 1538 // - if it matches then we create a JNI local reference to the object | |
| 1539 // and record the reference and tag value. | |
| 1540 // | |
| 1541 void do_entry(JvmtiTagHashmapEntry* entry) { | |
| 1542 for (int i=0; i<_tag_count; i++) { | |
| 1543 if (_tags[i] == entry->tag()) { | |
|
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1544 oop o = entry->object(); |
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|
1545 assert(o != NULL, "sanity check"); |
| 0 | 1546 |
| 1547 // the mirror is tagged | |
| 1548 if (o->is_klass()) { | |
| 1549 klassOop k = (klassOop)o; | |
| 1550 o = Klass::cast(k)->java_mirror(); | |
| 1551 } | |
| 1552 | |
| 1553 jobject ref = JNIHandles::make_local(JavaThread::current(), o); | |
| 1554 _object_results->append(ref); | |
| 1555 _tag_results->append((uint64_t)entry->tag()); | |
| 1556 } | |
| 1557 } | |
| 1558 } | |
| 1559 | |
| 1560 // return the results from the collection | |
| 1561 // | |
| 1562 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
| 1563 jvmtiError error; | |
| 1564 int count = _object_results->length(); | |
| 1565 assert(count >= 0, "sanity check"); | |
| 1566 | |
| 1567 // if object_result_ptr is not NULL then allocate the result and copy | |
| 1568 // in the object references. | |
| 1569 if (object_result_ptr != NULL) { | |
| 1570 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
| 1571 if (error != JVMTI_ERROR_NONE) { | |
| 1572 return error; | |
| 1573 } | |
| 1574 for (int i=0; i<count; i++) { | |
| 1575 (*object_result_ptr)[i] = _object_results->at(i); | |
| 1576 } | |
| 1577 } | |
| 1578 | |
| 1579 // if tag_result_ptr is not NULL then allocate the result and copy | |
| 1580 // in the tag values. | |
| 1581 if (tag_result_ptr != NULL) { | |
| 1582 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
| 1583 if (error != JVMTI_ERROR_NONE) { | |
| 1584 if (object_result_ptr != NULL) { | |
| 1585 _env->Deallocate((unsigned char*)object_result_ptr); | |
| 1586 } | |
| 1587 return error; | |
| 1588 } | |
| 1589 for (int i=0; i<count; i++) { | |
| 1590 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
| 1591 } | |
| 1592 } | |
| 1593 | |
| 1594 *count_ptr = count; | |
| 1595 return JVMTI_ERROR_NONE; | |
| 1596 } | |
| 1597 }; | |
| 1598 | |
| 1599 // return the list of objects with the specified tags | |
| 1600 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
| 1601 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
| 1602 | |
| 1603 TagObjectCollector collector(env(), tags, count); | |
| 1604 { | |
| 1605 // iterate over all tagged objects | |
| 1606 MutexLocker ml(lock()); | |
| 1607 entry_iterate(&collector); | |
| 1608 } | |
| 1609 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
| 1610 } | |
| 1611 | |
| 1612 | |
| 1613 // ObjectMarker is used to support the marking objects when walking the | |
| 1614 // heap. | |
| 1615 // | |
| 1616 // This implementation uses the existing mark bits in an object for | |
| 1617 // marking. Objects that are marked must later have their headers restored. | |
| 1618 // As most objects are unlocked and don't have their identity hash computed | |
| 1619 // we don't have to save their headers. Instead we save the headers that | |
| 1620 // are "interesting". Later when the headers are restored this implementation | |
| 1621 // restores all headers to their initial value and then restores the few | |
| 1622 // objects that had interesting headers. | |
| 1623 // | |
| 1624 // Future work: This implementation currently uses growable arrays to save | |
| 1625 // the oop and header of interesting objects. As an optimization we could | |
| 1626 // use the same technique as the GC and make use of the unused area | |
| 1627 // between top() and end(). | |
| 1628 // | |
| 1629 | |
| 1630 // An ObjectClosure used to restore the mark bits of an object | |
| 1631 class RestoreMarksClosure : public ObjectClosure { | |
| 1632 public: | |
| 1633 void do_object(oop o) { | |
| 1634 if (o != NULL) { | |
| 1635 markOop mark = o->mark(); | |
| 1636 if (mark->is_marked()) { | |
| 1637 o->init_mark(); | |
| 1638 } | |
| 1639 } | |
| 1640 } | |
| 1641 }; | |
| 1642 | |
| 1643 // ObjectMarker provides the mark and visited functions | |
| 1644 class ObjectMarker : AllStatic { | |
| 1645 private: | |
| 1646 // saved headers | |
| 1647 static GrowableArray<oop>* _saved_oop_stack; | |
| 1648 static GrowableArray<markOop>* _saved_mark_stack; | |
| 1649 | |
| 1650 public: | |
| 1651 static void init(); // initialize | |
| 1652 static void done(); // clean-up | |
| 1653 | |
| 1654 static inline void mark(oop o); // mark an object | |
| 1655 static inline bool visited(oop o); // check if object has been visited | |
| 1656 }; | |
| 1657 | |
| 1658 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
| 1659 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
| 1660 | |
| 1661 // initialize ObjectMarker - prepares for object marking | |
| 1662 void ObjectMarker::init() { | |
| 1663 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
| 1664 | |
| 1665 // prepare heap for iteration | |
| 1666 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
| 1667 | |
| 1668 // create stacks for interesting headers | |
| 1669 _saved_mark_stack = new (ResourceObj::C_HEAP) GrowableArray<markOop>(4000, true); | |
| 1670 _saved_oop_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(4000, true); | |
| 1671 | |
| 1672 if (UseBiasedLocking) { | |
| 1673 BiasedLocking::preserve_marks(); | |
| 1674 } | |
| 1675 } | |
| 1676 | |
| 1677 // Object marking is done so restore object headers | |
| 1678 void ObjectMarker::done() { | |
| 1679 // iterate over all objects and restore the mark bits to | |
| 1680 // their initial value | |
| 1681 RestoreMarksClosure blk; | |
| 1682 Universe::heap()->object_iterate(&blk); | |
| 1683 | |
| 1684 // When sharing is enabled we need to restore the headers of the objects | |
| 1685 // in the readwrite space too. | |
| 1686 if (UseSharedSpaces) { | |
| 1687 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 1688 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
| 1689 gen->rw_space()->object_iterate(&blk); | |
| 1690 } | |
| 1691 | |
| 1692 // now restore the interesting headers | |
| 1693 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
| 1694 oop o = _saved_oop_stack->at(i); | |
| 1695 markOop mark = _saved_mark_stack->at(i); | |
| 1696 o->set_mark(mark); | |
| 1697 } | |
| 1698 | |
| 1699 if (UseBiasedLocking) { | |
| 1700 BiasedLocking::restore_marks(); | |
| 1701 } | |
| 1702 | |
| 1703 // free the stacks | |
| 1704 delete _saved_oop_stack; | |
| 1705 delete _saved_mark_stack; | |
| 1706 } | |
| 1707 | |
| 1708 // mark an object | |
| 1709 inline void ObjectMarker::mark(oop o) { | |
| 1710 assert(Universe::heap()->is_in(o), "sanity check"); | |
| 1711 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
| 1712 | |
| 1713 // object's mark word | |
| 1714 markOop mark = o->mark(); | |
| 1715 | |
| 1716 if (mark->must_be_preserved(o)) { | |
| 1717 _saved_mark_stack->push(mark); | |
| 1718 _saved_oop_stack->push(o); | |
| 1719 } | |
| 1720 | |
| 1721 // mark the object | |
| 1722 o->set_mark(markOopDesc::prototype()->set_marked()); | |
| 1723 } | |
| 1724 | |
| 1725 // return true if object is marked | |
| 1726 inline bool ObjectMarker::visited(oop o) { | |
| 1727 return o->mark()->is_marked(); | |
| 1728 } | |
| 1729 | |
| 1730 // Stack allocated class to help ensure that ObjectMarker is used | |
| 1731 // correctly. Constructor initializes ObjectMarker, destructor calls | |
| 1732 // ObjectMarker's done() function to restore object headers. | |
| 1733 class ObjectMarkerController : public StackObj { | |
| 1734 public: | |
| 1735 ObjectMarkerController() { | |
| 1736 ObjectMarker::init(); | |
| 1737 } | |
| 1738 ~ObjectMarkerController() { | |
| 1739 ObjectMarker::done(); | |
| 1740 } | |
| 1741 }; | |
| 1742 | |
| 1743 | |
| 1744 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
| 1745 // (not performance critical as only used for roots) | |
| 1746 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
| 1747 switch (kind) { | |
| 1748 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
| 1749 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
| 1750 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
| 1751 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
| 1752 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
| 1753 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
| 1754 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
| 1755 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
| 1756 } | |
| 1757 } | |
| 1758 | |
| 1759 // Base class for all heap walk contexts. The base class maintains a flag | |
| 1760 // to indicate if the context is valid or not. | |
| 1761 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
| 1762 private: | |
| 1763 bool _valid; | |
| 1764 public: | |
| 1765 HeapWalkContext(bool valid) { _valid = valid; } | |
| 1766 void invalidate() { _valid = false; } | |
| 1767 bool is_valid() const { return _valid; } | |
| 1768 }; | |
| 1769 | |
| 1770 // A basic heap walk context for the deprecated heap walking functions. | |
| 1771 // The context for a basic heap walk are the callbacks and fields used by | |
| 1772 // the referrer caching scheme. | |
| 1773 class BasicHeapWalkContext: public HeapWalkContext { | |
| 1774 private: | |
| 1775 jvmtiHeapRootCallback _heap_root_callback; | |
| 1776 jvmtiStackReferenceCallback _stack_ref_callback; | |
| 1777 jvmtiObjectReferenceCallback _object_ref_callback; | |
| 1778 | |
| 1779 // used for caching | |
| 1780 oop _last_referrer; | |
| 1781 jlong _last_referrer_tag; | |
| 1782 | |
| 1783 public: | |
| 1784 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
| 1785 | |
| 1786 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
| 1787 jvmtiStackReferenceCallback stack_ref_callback, | |
| 1788 jvmtiObjectReferenceCallback object_ref_callback) : | |
| 1789 HeapWalkContext(true), | |
| 1790 _heap_root_callback(heap_root_callback), | |
| 1791 _stack_ref_callback(stack_ref_callback), | |
| 1792 _object_ref_callback(object_ref_callback), | |
| 1793 _last_referrer(NULL), | |
| 1794 _last_referrer_tag(0) { | |
| 1795 } | |
| 1796 | |
| 1797 // accessors | |
| 1798 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
| 1799 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
| 1800 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
| 1801 | |
| 1802 oop last_referrer() const { return _last_referrer; } | |
| 1803 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
| 1804 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
| 1805 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
| 1806 }; | |
| 1807 | |
| 1808 // The advanced heap walk context for the FollowReferences functions. | |
| 1809 // The context is the callbacks, and the fields used for filtering. | |
| 1810 class AdvancedHeapWalkContext: public HeapWalkContext { | |
| 1811 private: | |
| 1812 jint _heap_filter; | |
| 1813 KlassHandle _klass_filter; | |
| 1814 const jvmtiHeapCallbacks* _heap_callbacks; | |
| 1815 | |
| 1816 public: | |
| 1817 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
| 1818 | |
| 1819 AdvancedHeapWalkContext(jint heap_filter, | |
| 1820 KlassHandle klass_filter, | |
| 1821 const jvmtiHeapCallbacks* heap_callbacks) : | |
| 1822 HeapWalkContext(true), | |
| 1823 _heap_filter(heap_filter), | |
| 1824 _klass_filter(klass_filter), | |
| 1825 _heap_callbacks(heap_callbacks) { | |
| 1826 } | |
| 1827 | |
| 1828 // accessors | |
| 1829 jint heap_filter() const { return _heap_filter; } | |
| 1830 KlassHandle klass_filter() const { return _klass_filter; } | |
| 1831 | |
| 1832 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
| 1833 return _heap_callbacks->heap_reference_callback; | |
| 1834 }; | |
| 1835 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
| 1836 return _heap_callbacks->primitive_field_callback; | |
| 1837 } | |
| 1838 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
| 1839 return _heap_callbacks->array_primitive_value_callback; | |
| 1840 } | |
| 1841 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
| 1842 return _heap_callbacks->string_primitive_value_callback; | |
| 1843 } | |
| 1844 }; | |
| 1845 | |
| 1846 // The CallbackInvoker is a class with static functions that the heap walk can call | |
| 1847 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
| 1848 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
| 1849 // mode is for the newer FollowReferences function which supports a lot of | |
| 1850 // additional callbacks. | |
| 1851 class CallbackInvoker : AllStatic { | |
| 1852 private: | |
| 1853 // heap walk styles | |
| 1854 enum { basic, advanced }; | |
| 1855 static int _heap_walk_type; | |
| 1856 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
| 1857 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
| 1858 | |
| 1859 // context for basic style heap walk | |
| 1860 static BasicHeapWalkContext _basic_context; | |
| 1861 static BasicHeapWalkContext* basic_context() { | |
| 1862 assert(_basic_context.is_valid(), "invalid"); | |
| 1863 return &_basic_context; | |
| 1864 } | |
| 1865 | |
| 1866 // context for advanced style heap walk | |
| 1867 static AdvancedHeapWalkContext _advanced_context; | |
| 1868 static AdvancedHeapWalkContext* advanced_context() { | |
| 1869 assert(_advanced_context.is_valid(), "invalid"); | |
| 1870 return &_advanced_context; | |
| 1871 } | |
| 1872 | |
| 1873 // context needed for all heap walks | |
| 1874 static JvmtiTagMap* _tag_map; | |
| 1875 static const void* _user_data; | |
| 1876 static GrowableArray<oop>* _visit_stack; | |
| 1877 | |
| 1878 // accessors | |
| 1879 static JvmtiTagMap* tag_map() { return _tag_map; } | |
| 1880 static const void* user_data() { return _user_data; } | |
| 1881 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
| 1882 | |
| 1883 // if the object hasn't been visited then push it onto the visit stack | |
| 1884 // so that it will be visited later | |
| 1885 static inline bool check_for_visit(oop obj) { | |
| 1886 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
| 1887 return true; | |
| 1888 } | |
| 1889 | |
| 1890 // invoke basic style callbacks | |
| 1891 static inline bool invoke_basic_heap_root_callback | |
| 1892 (jvmtiHeapRootKind root_kind, oop obj); | |
| 1893 static inline bool invoke_basic_stack_ref_callback | |
| 1894 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
| 1895 int slot, oop obj); | |
| 1896 static inline bool invoke_basic_object_reference_callback | |
| 1897 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
| 1898 | |
| 1899 // invoke advanced style callbacks | |
| 1900 static inline bool invoke_advanced_heap_root_callback | |
| 1901 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
| 1902 static inline bool invoke_advanced_stack_ref_callback | |
| 1903 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
| 1904 jmethodID method, jlocation bci, jint slot, oop obj); | |
| 1905 static inline bool invoke_advanced_object_reference_callback | |
| 1906 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
| 1907 | |
| 1908 // used to report the value of primitive fields | |
| 1909 static inline bool report_primitive_field | |
| 1910 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
| 1911 | |
| 1912 public: | |
| 1913 // initialize for basic mode | |
| 1914 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
| 1915 GrowableArray<oop>* visit_stack, | |
| 1916 const void* user_data, | |
| 1917 BasicHeapWalkContext context); | |
| 1918 | |
| 1919 // initialize for advanced mode | |
| 1920 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
| 1921 GrowableArray<oop>* visit_stack, | |
| 1922 const void* user_data, | |
| 1923 AdvancedHeapWalkContext context); | |
| 1924 | |
| 1925 // functions to report roots | |
| 1926 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
| 1927 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
| 1928 jmethodID m, oop o); | |
| 1929 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
| 1930 jmethodID method, jlocation bci, jint slot, oop o); | |
| 1931 | |
| 1932 // functions to report references | |
| 1933 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
| 1934 static inline bool report_class_reference(oop referrer, oop referree); | |
| 1935 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
| 1936 static inline bool report_signers_reference(oop referrer, oop referree); | |
| 1937 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
| 1938 static inline bool report_superclass_reference(oop referrer, oop referree); | |
| 1939 static inline bool report_interface_reference(oop referrer, oop referree); | |
| 1940 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
| 1941 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
| 1942 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
| 1943 static inline bool report_primitive_array_values(oop array); | |
| 1944 static inline bool report_string_value(oop str); | |
| 1945 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
| 1946 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
| 1947 }; | |
| 1948 | |
| 1949 // statics | |
| 1950 int CallbackInvoker::_heap_walk_type; | |
| 1951 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
| 1952 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
| 1953 JvmtiTagMap* CallbackInvoker::_tag_map; | |
| 1954 const void* CallbackInvoker::_user_data; | |
| 1955 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
| 1956 | |
| 1957 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
| 1958 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
| 1959 GrowableArray<oop>* visit_stack, | |
| 1960 const void* user_data, | |
| 1961 BasicHeapWalkContext context) { | |
| 1962 _tag_map = tag_map; | |
| 1963 _visit_stack = visit_stack; | |
| 1964 _user_data = user_data; | |
| 1965 _basic_context = context; | |
| 1966 _advanced_context.invalidate(); // will trigger assertion if used | |
| 1967 _heap_walk_type = basic; | |
| 1968 } | |
| 1969 | |
| 1970 // initialize for advanced heap walk (FollowReferences) | |
| 1971 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
| 1972 GrowableArray<oop>* visit_stack, | |
| 1973 const void* user_data, | |
| 1974 AdvancedHeapWalkContext context) { | |
| 1975 _tag_map = tag_map; | |
| 1976 _visit_stack = visit_stack; | |
| 1977 _user_data = user_data; | |
| 1978 _advanced_context = context; | |
| 1979 _basic_context.invalidate(); // will trigger assertion if used | |
| 1980 _heap_walk_type = advanced; | |
| 1981 } | |
| 1982 | |
| 1983 | |
| 1984 // invoke basic style heap root callback | |
| 1985 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
| 1986 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 1987 | |
| 1988 // if we heap roots should be reported | |
| 1989 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
| 1990 if (cb == NULL) { | |
| 1991 return check_for_visit(obj); | |
| 1992 } | |
| 1993 | |
| 1994 CallbackWrapper wrapper(tag_map(), obj); | |
| 1995 jvmtiIterationControl control = (*cb)(root_kind, | |
| 1996 wrapper.klass_tag(), | |
| 1997 wrapper.obj_size(), | |
| 1998 wrapper.obj_tag_p(), | |
| 1999 (void*)user_data()); | |
| 2000 // push root to visit stack when following references | |
| 2001 if (control == JVMTI_ITERATION_CONTINUE && | |
| 2002 basic_context()->object_ref_callback() != NULL) { | |
| 2003 visit_stack()->push(obj); | |
| 2004 } | |
| 2005 return control != JVMTI_ITERATION_ABORT; | |
| 2006 } | |
| 2007 | |
| 2008 // invoke basic style stack ref callback | |
| 2009 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
| 2010 jlong thread_tag, | |
| 2011 jint depth, | |
| 2012 jmethodID method, | |
| 2013 jint slot, | |
| 2014 oop obj) { | |
| 2015 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2016 | |
| 2017 // if we stack refs should be reported | |
| 2018 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
| 2019 if (cb == NULL) { | |
| 2020 return check_for_visit(obj); | |
| 2021 } | |
| 2022 | |
| 2023 CallbackWrapper wrapper(tag_map(), obj); | |
| 2024 jvmtiIterationControl control = (*cb)(root_kind, | |
| 2025 wrapper.klass_tag(), | |
| 2026 wrapper.obj_size(), | |
| 2027 wrapper.obj_tag_p(), | |
| 2028 thread_tag, | |
| 2029 depth, | |
| 2030 method, | |
| 2031 slot, | |
| 2032 (void*)user_data()); | |
| 2033 // push root to visit stack when following references | |
| 2034 if (control == JVMTI_ITERATION_CONTINUE && | |
| 2035 basic_context()->object_ref_callback() != NULL) { | |
| 2036 visit_stack()->push(obj); | |
| 2037 } | |
| 2038 return control != JVMTI_ITERATION_ABORT; | |
| 2039 } | |
| 2040 | |
| 2041 // invoke basic style object reference callback | |
| 2042 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
| 2043 oop referrer, | |
| 2044 oop referree, | |
| 2045 jint index) { | |
| 2046 | |
| 2047 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
| 2048 assert(ServiceUtil::visible_oop(referree), "checking"); | |
| 2049 | |
| 2050 BasicHeapWalkContext* context = basic_context(); | |
| 2051 | |
| 2052 // callback requires the referrer's tag. If it's the same referrer | |
| 2053 // as the last call then we use the cached value. | |
| 2054 jlong referrer_tag; | |
| 2055 if (referrer == context->last_referrer()) { | |
| 2056 referrer_tag = context->last_referrer_tag(); | |
| 2057 } else { | |
| 2058 referrer_tag = tag_for(tag_map(), klassOop_if_java_lang_Class(referrer)); | |
| 2059 } | |
| 2060 | |
| 2061 // do the callback | |
| 2062 CallbackWrapper wrapper(tag_map(), referree); | |
| 2063 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
| 2064 jvmtiIterationControl control = (*cb)(ref_kind, | |
| 2065 wrapper.klass_tag(), | |
| 2066 wrapper.obj_size(), | |
| 2067 wrapper.obj_tag_p(), | |
| 2068 referrer_tag, | |
| 2069 index, | |
| 2070 (void*)user_data()); | |
| 2071 | |
| 2072 // record referrer and referrer tag. For self-references record the | |
| 2073 // tag value from the callback as this might differ from referrer_tag. | |
| 2074 context->set_last_referrer(referrer); | |
| 2075 if (referrer == referree) { | |
| 2076 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
| 2077 } else { | |
| 2078 context->set_last_referrer_tag(referrer_tag); | |
| 2079 } | |
| 2080 | |
| 2081 if (control == JVMTI_ITERATION_CONTINUE) { | |
| 2082 return check_for_visit(referree); | |
| 2083 } else { | |
| 2084 return control != JVMTI_ITERATION_ABORT; | |
| 2085 } | |
| 2086 } | |
| 2087 | |
| 2088 // invoke advanced style heap root callback | |
| 2089 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2090 oop obj) { | |
| 2091 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2092 | |
| 2093 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2094 | |
| 2095 // check that callback is provided | |
| 2096 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2097 if (cb == NULL) { | |
| 2098 return check_for_visit(obj); | |
| 2099 } | |
| 2100 | |
| 2101 // apply class filter | |
| 2102 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2103 return check_for_visit(obj); | |
| 2104 } | |
| 2105 | |
| 2106 // setup the callback wrapper | |
| 2107 CallbackWrapper wrapper(tag_map(), obj); | |
| 2108 | |
| 2109 // apply tag filter | |
| 2110 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2111 wrapper.klass_tag(), | |
| 2112 context->heap_filter())) { | |
| 2113 return check_for_visit(obj); | |
| 2114 } | |
| 2115 | |
| 2116 // for arrays we need the length, otherwise -1 | |
| 2117 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2118 | |
| 2119 // invoke the callback | |
| 2120 jint res = (*cb)(ref_kind, | |
| 2121 NULL, // referrer info | |
| 2122 wrapper.klass_tag(), | |
| 2123 0, // referrer_class_tag is 0 for heap root | |
| 2124 wrapper.obj_size(), | |
| 2125 wrapper.obj_tag_p(), | |
| 2126 NULL, // referrer_tag_p | |
| 2127 len, | |
| 2128 (void*)user_data()); | |
| 2129 if (res & JVMTI_VISIT_ABORT) { | |
| 2130 return false;// referrer class tag | |
| 2131 } | |
| 2132 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2133 check_for_visit(obj); | |
| 2134 } | |
| 2135 return true; | |
| 2136 } | |
| 2137 | |
| 2138 // report a reference from a thread stack to an object | |
| 2139 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2140 jlong thread_tag, | |
| 2141 jlong tid, | |
| 2142 int depth, | |
| 2143 jmethodID method, | |
| 2144 jlocation bci, | |
| 2145 jint slot, | |
| 2146 oop obj) { | |
| 2147 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2148 | |
| 2149 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2150 | |
| 2151 // check that callback is provider | |
| 2152 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2153 if (cb == NULL) { | |
| 2154 return check_for_visit(obj); | |
| 2155 } | |
| 2156 | |
| 2157 // apply class filter | |
| 2158 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2159 return check_for_visit(obj); | |
| 2160 } | |
| 2161 | |
| 2162 // setup the callback wrapper | |
| 2163 CallbackWrapper wrapper(tag_map(), obj); | |
| 2164 | |
| 2165 // apply tag filter | |
| 2166 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2167 wrapper.klass_tag(), | |
| 2168 context->heap_filter())) { | |
| 2169 return check_for_visit(obj); | |
| 2170 } | |
| 2171 | |
| 2172 // setup the referrer info | |
| 2173 jvmtiHeapReferenceInfo reference_info; | |
| 2174 reference_info.stack_local.thread_tag = thread_tag; | |
| 2175 reference_info.stack_local.thread_id = tid; | |
| 2176 reference_info.stack_local.depth = depth; | |
| 2177 reference_info.stack_local.method = method; | |
| 2178 reference_info.stack_local.location = bci; | |
| 2179 reference_info.stack_local.slot = slot; | |
| 2180 | |
| 2181 // for arrays we need the length, otherwise -1 | |
| 2182 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2183 | |
| 2184 // call into the agent | |
| 2185 int res = (*cb)(ref_kind, | |
| 2186 &reference_info, | |
| 2187 wrapper.klass_tag(), | |
| 2188 0, // referrer_class_tag is 0 for heap root (stack) | |
| 2189 wrapper.obj_size(), | |
| 2190 wrapper.obj_tag_p(), | |
| 2191 NULL, // referrer_tag is 0 for root | |
| 2192 len, | |
| 2193 (void*)user_data()); | |
| 2194 | |
| 2195 if (res & JVMTI_VISIT_ABORT) { | |
| 2196 return false; | |
| 2197 } | |
| 2198 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2199 check_for_visit(obj); | |
| 2200 } | |
| 2201 return true; | |
| 2202 } | |
| 2203 | |
| 2204 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
| 2205 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
| 2206 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
| 2207 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
| 2208 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
| 2209 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
| 2210 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
| 2211 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
| 2212 | |
| 2213 // invoke the object reference callback to report a reference | |
| 2214 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
| 2215 oop referrer, | |
| 2216 oop obj, | |
| 2217 jint index) | |
| 2218 { | |
| 2219 // field index is only valid field in reference_info | |
| 2220 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 2221 | |
| 2222 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
| 2223 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2224 | |
| 2225 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2226 | |
| 2227 // check that callback is provider | |
| 2228 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
| 2229 if (cb == NULL) { | |
| 2230 return check_for_visit(obj); | |
| 2231 } | |
| 2232 | |
| 2233 // apply class filter | |
| 2234 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2235 return check_for_visit(obj); | |
| 2236 } | |
| 2237 | |
| 2238 // setup the callback wrapper | |
| 2239 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
| 2240 | |
| 2241 // apply tag filter | |
| 2242 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2243 wrapper.klass_tag(), | |
| 2244 context->heap_filter())) { | |
| 2245 return check_for_visit(obj); | |
| 2246 } | |
| 2247 | |
| 2248 // field index is only valid field in reference_info | |
| 2249 reference_info.field.index = index; | |
| 2250 | |
| 2251 // for arrays we need the length, otherwise -1 | |
| 2252 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
| 2253 | |
| 2254 // invoke the callback | |
| 2255 int res = (*cb)(ref_kind, | |
| 2256 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
| 2257 wrapper.klass_tag(), | |
| 2258 wrapper.referrer_klass_tag(), | |
| 2259 wrapper.obj_size(), | |
| 2260 wrapper.obj_tag_p(), | |
| 2261 wrapper.referrer_tag_p(), | |
| 2262 len, | |
| 2263 (void*)user_data()); | |
| 2264 | |
| 2265 if (res & JVMTI_VISIT_ABORT) { | |
| 2266 return false; | |
| 2267 } | |
| 2268 if (res & JVMTI_VISIT_OBJECTS) { | |
| 2269 check_for_visit(obj); | |
| 2270 } | |
| 2271 return true; | |
| 2272 } | |
| 2273 | |
| 2274 // report a "simple root" | |
| 2275 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
| 2276 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
| 2277 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
| 2278 assert(ServiceUtil::visible_oop(obj), "checking"); | |
| 2279 | |
| 2280 if (is_basic_heap_walk()) { | |
| 2281 // map to old style root kind | |
| 2282 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
| 2283 return invoke_basic_heap_root_callback(root_kind, obj); | |
| 2284 } else { | |
| 2285 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
| 2286 return invoke_advanced_heap_root_callback(kind, obj); | |
| 2287 } | |
| 2288 } | |
| 2289 | |
| 2290 | |
| 2291 // invoke the primitive array values | |
| 2292 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
| 2293 assert(obj->is_typeArray(), "not a primitive array"); | |
| 2294 | |
| 2295 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2296 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
| 2297 | |
| 2298 // apply class filter | |
| 2299 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2300 return true; | |
| 2301 } | |
| 2302 | |
| 2303 CallbackWrapper wrapper(tag_map(), obj); | |
| 2304 | |
| 2305 // apply tag filter | |
| 2306 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2307 wrapper.klass_tag(), | |
| 2308 context->heap_filter())) { | |
| 2309 return true; | |
| 2310 } | |
| 2311 | |
| 2312 // invoke the callback | |
| 2313 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
| 2314 &wrapper, | |
| 2315 obj, | |
| 2316 (void*)user_data()); | |
| 2317 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2318 } | |
| 2319 | |
| 2320 // invoke the string value callback | |
| 2321 inline bool CallbackInvoker::report_string_value(oop str) { | |
| 1142 | 2322 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
| 0 | 2323 |
| 2324 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2325 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
| 2326 | |
| 2327 // apply class filter | |
| 2328 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
| 2329 return true; | |
| 2330 } | |
| 2331 | |
| 2332 CallbackWrapper wrapper(tag_map(), str); | |
| 2333 | |
| 2334 // apply tag filter | |
| 2335 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2336 wrapper.klass_tag(), | |
| 2337 context->heap_filter())) { | |
| 2338 return true; | |
| 2339 } | |
| 2340 | |
| 2341 // invoke the callback | |
| 2342 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
| 2343 &wrapper, | |
| 2344 str, | |
| 2345 (void*)user_data()); | |
| 2346 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2347 } | |
| 2348 | |
| 2349 // invoke the primitive field callback | |
| 2350 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
| 2351 oop obj, | |
| 2352 jint index, | |
| 2353 address addr, | |
| 2354 char type) | |
| 2355 { | |
| 2356 // for primitive fields only the index will be set | |
| 2357 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
| 2358 | |
| 2359 AdvancedHeapWalkContext* context = advanced_context(); | |
| 2360 assert(context->primitive_field_callback() != NULL, "no callback"); | |
| 2361 | |
| 2362 // apply class filter | |
| 2363 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
| 2364 return true; | |
| 2365 } | |
| 2366 | |
| 2367 CallbackWrapper wrapper(tag_map(), obj); | |
| 2368 | |
| 2369 // apply tag filter | |
| 2370 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
| 2371 wrapper.klass_tag(), | |
| 2372 context->heap_filter())) { | |
| 2373 return true; | |
| 2374 } | |
| 2375 | |
| 2376 // the field index in the referrer | |
| 2377 reference_info.field.index = index; | |
| 2378 | |
| 2379 // map the type | |
| 2380 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
| 2381 | |
| 2382 // setup the jvalue | |
| 2383 jvalue value; | |
| 2384 copy_to_jvalue(&value, addr, value_type); | |
| 2385 | |
| 2386 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
| 2387 int res = (*cb)(ref_kind, | |
| 2388 &reference_info, | |
| 2389 wrapper.klass_tag(), | |
| 2390 wrapper.obj_tag_p(), | |
| 2391 value, | |
| 2392 value_type, | |
| 2393 (void*)user_data()); | |
| 2394 return (!(res & JVMTI_VISIT_ABORT)); | |
| 2395 } | |
| 2396 | |
| 2397 | |
| 2398 // instance field | |
| 2399 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
| 2400 jint index, | |
| 2401 address value, | |
| 2402 char type) { | |
| 2403 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
| 2404 obj, | |
| 2405 index, | |
| 2406 value, | |
| 2407 type); | |
| 2408 } | |
| 2409 | |
| 2410 // static field | |
| 2411 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
| 2412 jint index, | |
| 2413 address value, | |
| 2414 char type) { | |
| 2415 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
| 2416 obj, | |
| 2417 index, | |
| 2418 value, | |
| 2419 type); | |
| 2420 } | |
| 2421 | |
| 2422 // report a JNI local (root object) to the profiler | |
| 2423 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
| 2424 if (is_basic_heap_walk()) { | |
| 2425 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
| 2426 thread_tag, | |
| 2427 depth, | |
| 2428 m, | |
| 2429 -1, | |
| 2430 obj); | |
| 2431 } else { | |
| 2432 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
| 2433 thread_tag, tid, | |
| 2434 depth, | |
| 2435 m, | |
| 2436 (jlocation)-1, | |
| 2437 -1, | |
| 2438 obj); | |
| 2439 } | |
| 2440 } | |
| 2441 | |
| 2442 | |
| 2443 // report a local (stack reference, root object) | |
| 2444 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
| 2445 jlong tid, | |
| 2446 jint depth, | |
| 2447 jmethodID method, | |
| 2448 jlocation bci, | |
| 2449 jint slot, | |
| 2450 oop obj) { | |
| 2451 if (is_basic_heap_walk()) { | |
| 2452 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
| 2453 thread_tag, | |
| 2454 depth, | |
| 2455 method, | |
| 2456 slot, | |
| 2457 obj); | |
| 2458 } else { | |
| 2459 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
| 2460 thread_tag, | |
| 2461 tid, | |
| 2462 depth, | |
| 2463 method, | |
| 2464 bci, | |
| 2465 slot, | |
| 2466 obj); | |
| 2467 } | |
| 2468 } | |
| 2469 | |
| 2470 // report an object referencing a class. | |
| 2471 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
| 2472 if (is_basic_heap_walk()) { | |
| 2473 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
| 2474 } else { | |
| 2475 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
| 2476 } | |
| 2477 } | |
| 2478 | |
| 2479 // report a class referencing its class loader. | |
| 2480 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
| 2481 if (is_basic_heap_walk()) { | |
| 2482 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
| 2483 } else { | |
| 2484 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
| 2485 } | |
| 2486 } | |
| 2487 | |
| 2488 // report a class referencing its signers. | |
| 2489 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
| 2490 if (is_basic_heap_walk()) { | |
| 2491 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
| 2492 } else { | |
| 2493 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
| 2494 } | |
| 2495 } | |
| 2496 | |
| 2497 // report a class referencing its protection domain.. | |
| 2498 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
| 2499 if (is_basic_heap_walk()) { | |
| 2500 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
| 2501 } else { | |
| 2502 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
| 2503 } | |
| 2504 } | |
| 2505 | |
| 2506 // report a class referencing its superclass. | |
| 2507 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
| 2508 if (is_basic_heap_walk()) { | |
| 2509 // Send this to be consistent with past implementation | |
| 2510 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
| 2511 } else { | |
| 2512 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); | |
| 2513 } | |
| 2514 } | |
| 2515 | |
| 2516 // report a class referencing one of its interfaces. | |
| 2517 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
| 2518 if (is_basic_heap_walk()) { | |
| 2519 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
| 2520 } else { | |
| 2521 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
| 2522 } | |
| 2523 } | |
| 2524 | |
| 2525 // report a class referencing one of its static fields. | |
| 2526 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
| 2527 if (is_basic_heap_walk()) { | |
| 2528 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
| 2529 } else { | |
| 2530 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
| 2531 } | |
| 2532 } | |
| 2533 | |
| 2534 // report an array referencing an element object | |
| 2535 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
| 2536 if (is_basic_heap_walk()) { | |
| 2537 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
| 2538 } else { | |
| 2539 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
| 2540 } | |
| 2541 } | |
| 2542 | |
| 2543 // report an object referencing an instance field object | |
| 2544 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
| 2545 if (is_basic_heap_walk()) { | |
| 2546 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
| 2547 } else { | |
| 2548 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
| 2549 } | |
| 2550 } | |
| 2551 | |
| 2552 // report an array referencing an element object | |
| 2553 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
| 2554 if (is_basic_heap_walk()) { | |
| 2555 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
| 2556 } else { | |
| 2557 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
| 2558 } | |
| 2559 } | |
| 2560 | |
| 2561 // A supporting closure used to process simple roots | |
| 2562 class SimpleRootsClosure : public OopClosure { | |
| 2563 private: | |
| 2564 jvmtiHeapReferenceKind _kind; | |
| 2565 bool _continue; | |
| 2566 | |
| 2567 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
| 2568 | |
| 2569 public: | |
| 2570 void set_kind(jvmtiHeapReferenceKind kind) { | |
| 2571 _kind = kind; | |
| 2572 _continue = true; | |
| 2573 } | |
| 2574 | |
| 2575 inline bool stopped() { | |
| 2576 return !_continue; | |
| 2577 } | |
| 2578 | |
| 2579 void do_oop(oop* obj_p) { | |
| 2580 // iteration has terminated | |
| 2581 if (stopped()) { | |
| 2582 return; | |
| 2583 } | |
| 2584 | |
| 2585 // ignore null or deleted handles | |
| 2586 oop o = *obj_p; | |
| 2587 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
| 2588 return; | |
| 2589 } | |
| 2590 | |
| 2591 jvmtiHeapReferenceKind kind = root_kind(); | |
| 2592 | |
| 2593 // many roots are Klasses so we use the java mirror | |
| 2594 if (o->is_klass()) { | |
| 2595 klassOop k = (klassOop)o; | |
| 2596 o = Klass::cast(k)->java_mirror(); | |
| 2597 } else { | |
| 2598 | |
| 2599 // SystemDictionary::always_strong_oops_do reports the application | |
| 2600 // class loader as a root. We want this root to be reported as | |
| 2601 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
| 2602 if (o->is_instance() && root_kind() == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { | |
| 2603 kind = JVMTI_HEAP_REFERENCE_OTHER; | |
| 2604 } | |
| 2605 } | |
| 2606 | |
| 2607 // some objects are ignored - in the case of simple | |
| 2608 // roots it's mostly symbolOops that we are skipping | |
| 2609 // here. | |
| 2610 if (!ServiceUtil::visible_oop(o)) { | |
| 2611 return; | |
| 2612 } | |
| 2613 | |
| 2614 // invoke the callback | |
| 2615 _continue = CallbackInvoker::report_simple_root(kind, o); | |
| 2616 | |
| 2617 } | |
|
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2618 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| 0 | 2619 }; |
| 2620 | |
| 2621 // A supporting closure used to process JNI locals | |
| 2622 class JNILocalRootsClosure : public OopClosure { | |
| 2623 private: | |
| 2624 jlong _thread_tag; | |
| 2625 jlong _tid; | |
| 2626 jint _depth; | |
| 2627 jmethodID _method; | |
| 2628 bool _continue; | |
| 2629 public: | |
| 2630 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
| 2631 _thread_tag = thread_tag; | |
| 2632 _tid = tid; | |
| 2633 _depth = depth; | |
| 2634 _method = method; | |
| 2635 _continue = true; | |
| 2636 } | |
| 2637 | |
| 2638 inline bool stopped() { | |
| 2639 return !_continue; | |
| 2640 } | |
| 2641 | |
| 2642 void do_oop(oop* obj_p) { | |
| 2643 // iteration has terminated | |
| 2644 if (stopped()) { | |
| 2645 return; | |
| 2646 } | |
| 2647 | |
| 2648 // ignore null or deleted handles | |
| 2649 oop o = *obj_p; | |
| 2650 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
| 2651 return; | |
| 2652 } | |
| 2653 | |
| 2654 if (!ServiceUtil::visible_oop(o)) { | |
| 2655 return; | |
| 2656 } | |
| 2657 | |
| 2658 // invoke the callback | |
| 2659 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
| 2660 } | |
|
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2661 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| 0 | 2662 }; |
| 2663 | |
| 2664 | |
| 2665 // A VM operation to iterate over objects that are reachable from | |
| 2666 // a set of roots or an initial object. | |
| 2667 // | |
| 2668 // For VM_HeapWalkOperation the set of roots used is :- | |
| 2669 // | |
| 2670 // - All JNI global references | |
| 2671 // - All inflated monitors | |
| 2672 // - All classes loaded by the boot class loader (or all classes | |
| 2673 // in the event that class unloading is disabled) | |
| 2674 // - All java threads | |
| 2675 // - For each java thread then all locals and JNI local references | |
| 2676 // on the thread's execution stack | |
| 2677 // - All visible/explainable objects from Universes::oops_do | |
| 2678 // | |
| 2679 class VM_HeapWalkOperation: public VM_Operation { | |
| 2680 private: | |
| 2681 enum { | |
| 2682 initial_visit_stack_size = 4000 | |
| 2683 }; | |
| 2684 | |
| 2685 bool _is_advanced_heap_walk; // indicates FollowReferences | |
| 2686 JvmtiTagMap* _tag_map; | |
| 2687 Handle _initial_object; | |
| 2688 GrowableArray<oop>* _visit_stack; // the visit stack | |
| 2689 | |
| 2690 bool _collecting_heap_roots; // are we collecting roots | |
| 2691 bool _following_object_refs; // are we following object references | |
| 2692 | |
| 2693 bool _reporting_primitive_fields; // optional reporting | |
| 2694 bool _reporting_primitive_array_values; | |
| 2695 bool _reporting_string_values; | |
| 2696 | |
| 2697 GrowableArray<oop>* create_visit_stack() { | |
| 2698 return new (ResourceObj::C_HEAP) GrowableArray<oop>(initial_visit_stack_size, true); | |
| 2699 } | |
| 2700 | |
| 2701 // accessors | |
| 2702 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
| 2703 JvmtiTagMap* tag_map() const { return _tag_map; } | |
| 2704 Handle initial_object() const { return _initial_object; } | |
| 2705 | |
| 2706 bool is_following_references() const { return _following_object_refs; } | |
| 2707 | |
| 2708 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
| 2709 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
| 2710 bool is_reporting_string_values() const { return _reporting_string_values; } | |
| 2711 | |
| 2712 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
| 2713 | |
| 2714 // iterate over the various object types | |
| 2715 inline bool iterate_over_array(oop o); | |
| 2716 inline bool iterate_over_type_array(oop o); | |
| 2717 inline bool iterate_over_class(klassOop o); | |
| 2718 inline bool iterate_over_object(oop o); | |
| 2719 | |
| 2720 // root collection | |
| 2721 inline bool collect_simple_roots(); | |
| 2722 inline bool collect_stack_roots(); | |
| 2723 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
| 2724 | |
| 2725 // visit an object | |
| 2726 inline bool visit(oop o); | |
| 2727 | |
| 2728 public: | |
| 2729 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2730 Handle initial_object, | |
| 2731 BasicHeapWalkContext callbacks, | |
| 2732 const void* user_data); | |
| 2733 | |
| 2734 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2735 Handle initial_object, | |
| 2736 AdvancedHeapWalkContext callbacks, | |
| 2737 const void* user_data); | |
| 2738 | |
| 2739 ~VM_HeapWalkOperation(); | |
| 2740 | |
| 2741 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
| 2742 void doit(); | |
| 2743 }; | |
| 2744 | |
| 2745 | |
| 2746 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2747 Handle initial_object, | |
| 2748 BasicHeapWalkContext callbacks, | |
| 2749 const void* user_data) { | |
| 2750 _is_advanced_heap_walk = false; | |
| 2751 _tag_map = tag_map; | |
| 2752 _initial_object = initial_object; | |
| 2753 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
| 2754 _reporting_primitive_fields = false; | |
| 2755 _reporting_primitive_array_values = false; | |
| 2756 _reporting_string_values = false; | |
| 2757 _visit_stack = create_visit_stack(); | |
| 2758 | |
| 2759 | |
| 2760 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
| 2761 } | |
| 2762 | |
| 2763 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
| 2764 Handle initial_object, | |
| 2765 AdvancedHeapWalkContext callbacks, | |
| 2766 const void* user_data) { | |
| 2767 _is_advanced_heap_walk = true; | |
| 2768 _tag_map = tag_map; | |
| 2769 _initial_object = initial_object; | |
| 2770 _following_object_refs = true; | |
| 2771 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
| 2772 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
| 2773 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
| 2774 _visit_stack = create_visit_stack(); | |
| 2775 | |
| 2776 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
| 2777 } | |
| 2778 | |
| 2779 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
| 2780 if (_following_object_refs) { | |
| 2781 assert(_visit_stack != NULL, "checking"); | |
| 2782 delete _visit_stack; | |
| 2783 _visit_stack = NULL; | |
| 2784 } | |
| 2785 } | |
| 2786 | |
| 2787 // an array references its class and has a reference to | |
| 2788 // each element in the array | |
| 2789 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
| 2790 objArrayOop array = objArrayOop(o); | |
| 2791 if (array->klass() == Universe::systemObjArrayKlassObj()) { | |
| 2792 // filtered out | |
| 2793 return true; | |
| 2794 } | |
| 2795 | |
| 2796 // array reference to its class | |
| 2797 oop mirror = objArrayKlass::cast(array->klass())->java_mirror(); | |
| 2798 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
| 2799 return false; | |
| 2800 } | |
| 2801 | |
| 2802 // iterate over the array and report each reference to a | |
| 2803 // non-null element | |
| 2804 for (int index=0; index<array->length(); index++) { | |
| 2805 oop elem = array->obj_at(index); | |
| 2806 if (elem == NULL) { | |
| 2807 continue; | |
| 2808 } | |
| 2809 | |
| 2810 // report the array reference o[index] = elem | |
| 2811 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
| 2812 return false; | |
| 2813 } | |
| 2814 } | |
| 2815 return true; | |
| 2816 } | |
| 2817 | |
| 2818 // a type array references its class | |
| 2819 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
| 2820 klassOop k = o->klass(); | |
| 2821 oop mirror = Klass::cast(k)->java_mirror(); | |
| 2822 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
| 2823 return false; | |
| 2824 } | |
| 2825 | |
| 2826 // report the array contents if required | |
| 2827 if (is_reporting_primitive_array_values()) { | |
| 2828 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
| 2829 return false; | |
| 2830 } | |
| 2831 } | |
| 2832 return true; | |
| 2833 } | |
| 2834 | |
| 2835 // verify that a static oop field is in range | |
|
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2836 static inline bool verify_static_oop(instanceKlass* ik, |
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2837 klassOop k, int offset) { |
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2838 address obj_p = (address)k + offset; |
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2839 address start = (address)ik->start_of_static_fields(); |
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2840 address end = start + (ik->static_oop_field_size() * heapOopSize); |
| 0 | 2841 assert(end >= start, "sanity check"); |
| 2842 | |
| 2843 if (obj_p >= start && obj_p < end) { | |
| 2844 return true; | |
| 2845 } else { | |
| 2846 return false; | |
| 2847 } | |
| 2848 } | |
| 2849 | |
| 2850 // a class references its super class, interfaces, class loader, ... | |
| 2851 // and finally its static fields | |
| 2852 inline bool VM_HeapWalkOperation::iterate_over_class(klassOop k) { | |
| 2853 int i; | |
| 2854 Klass* klass = klassOop(k)->klass_part(); | |
| 2855 | |
| 2856 if (klass->oop_is_instance()) { | |
| 2857 instanceKlass* ik = instanceKlass::cast(k); | |
| 2858 | |
| 2859 // ignore the class if it's has been initialized yet | |
| 2860 if (!ik->is_linked()) { | |
| 2861 return true; | |
| 2862 } | |
| 2863 | |
| 2864 // get the java mirror | |
| 2865 oop mirror = klass->java_mirror(); | |
| 2866 | |
| 2867 // super (only if something more interesting than java.lang.Object) | |
| 2868 klassOop java_super = ik->java_super(); | |
| 1142 | 2869 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
| 0 | 2870 oop super = Klass::cast(java_super)->java_mirror(); |
| 2871 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { | |
| 2872 return false; | |
| 2873 } | |
| 2874 } | |
| 2875 | |
| 2876 // class loader | |
| 2877 oop cl = ik->class_loader(); | |
| 2878 if (cl != NULL) { | |
| 2879 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
| 2880 return false; | |
| 2881 } | |
| 2882 } | |
| 2883 | |
| 2884 // protection domain | |
| 2885 oop pd = ik->protection_domain(); | |
| 2886 if (pd != NULL) { | |
| 2887 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
| 2888 return false; | |
| 2889 } | |
| 2890 } | |
| 2891 | |
| 2892 // signers | |
| 2893 oop signers = ik->signers(); | |
| 2894 if (signers != NULL) { | |
| 2895 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
| 2896 return false; | |
| 2897 } | |
| 2898 } | |
| 2899 | |
| 2900 // references from the constant pool | |
| 2901 { | |
| 2902 const constantPoolOop pool = ik->constants(); | |
| 2903 for (int i = 1; i < pool->length(); i++) { | |
| 2904 constantTag tag = pool->tag_at(i).value(); | |
| 2905 if (tag.is_string() || tag.is_klass()) { | |
| 2906 oop entry; | |
| 2907 if (tag.is_string()) { | |
| 2908 entry = pool->resolved_string_at(i); | |
| 2909 assert(java_lang_String::is_instance(entry), "must be string"); | |
| 2910 } else { | |
| 2911 entry = Klass::cast(pool->resolved_klass_at(i))->java_mirror(); | |
| 2912 } | |
| 2913 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
| 2914 return false; | |
| 2915 } | |
| 2916 } | |
| 2917 } | |
| 2918 } | |
| 2919 | |
| 2920 // interfaces | |
| 2921 // (These will already have been reported as references from the constant pool | |
| 2922 // but are specified by IterateOverReachableObjects and must be reported). | |
| 2923 objArrayOop interfaces = ik->local_interfaces(); | |
| 2924 for (i = 0; i < interfaces->length(); i++) { | |
| 2925 oop interf = Klass::cast((klassOop)interfaces->obj_at(i))->java_mirror(); | |
| 2926 if (interf == NULL) { | |
| 2927 continue; | |
| 2928 } | |
| 2929 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
| 2930 return false; | |
| 2931 } | |
| 2932 } | |
| 2933 | |
| 2934 // iterate over the static fields | |
| 2935 | |
| 2936 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
| 2937 for (i=0; i<field_map->field_count(); i++) { | |
| 2938 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 2939 char type = field->field_type(); | |
| 2940 if (!is_primitive_field_type(type)) { | |
|
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2941 oop fld_o = k->obj_field(field->field_offset()); |
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2942 assert(verify_static_oop(ik, k, field->field_offset()), "sanity check"); |
| 0 | 2943 if (fld_o != NULL) { |
| 2944 int slot = field->field_index(); | |
| 2945 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
| 2946 delete field_map; | |
| 2947 return false; | |
| 2948 } | |
| 2949 } | |
| 2950 } else { | |
| 2951 if (is_reporting_primitive_fields()) { | |
| 2952 address addr = (address)k + field->field_offset(); | |
| 2953 int slot = field->field_index(); | |
| 2954 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
| 2955 delete field_map; | |
| 2956 return false; | |
| 2957 } | |
| 2958 } | |
| 2959 } | |
| 2960 } | |
| 2961 delete field_map; | |
| 2962 | |
| 2963 return true; | |
| 2964 } | |
| 2965 | |
| 2966 return true; | |
| 2967 } | |
| 2968 | |
| 2969 // an object references a class and its instance fields | |
| 2970 // (static fields are ignored here as we report these as | |
| 2971 // references from the class). | |
| 2972 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
| 2973 // reference to the class | |
| 2974 if (!CallbackInvoker::report_class_reference(o, Klass::cast(o->klass())->java_mirror())) { | |
| 2975 return false; | |
| 2976 } | |
| 2977 | |
| 2978 // iterate over instance fields | |
| 2979 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
| 2980 for (int i=0; i<field_map->field_count(); i++) { | |
| 2981 ClassFieldDescriptor* field = field_map->field_at(i); | |
| 2982 char type = field->field_type(); | |
| 2983 if (!is_primitive_field_type(type)) { | |
|
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|
2984 oop fld_o = o->obj_field(field->field_offset()); |
| 0 | 2985 if (fld_o != NULL) { |
| 2986 // reflection code may have a reference to a klassOop. | |
| 2987 // - see sun.reflect.UnsafeStaticFieldAccessorImpl and sun.misc.Unsafe | |
| 2988 if (fld_o->is_klass()) { | |
| 2989 klassOop k = (klassOop)fld_o; | |
| 2990 fld_o = Klass::cast(k)->java_mirror(); | |
| 2991 } | |
| 2992 int slot = field->field_index(); | |
| 2993 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
| 2994 return false; | |
| 2995 } | |
| 2996 } | |
| 2997 } else { | |
| 2998 if (is_reporting_primitive_fields()) { | |
| 2999 // primitive instance field | |
| 3000 address addr = (address)o + field->field_offset(); | |
| 3001 int slot = field->field_index(); | |
| 3002 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
| 3003 return false; | |
| 3004 } | |
| 3005 } | |
| 3006 } | |
| 3007 } | |
| 3008 | |
| 3009 // if the object is a java.lang.String | |
| 3010 if (is_reporting_string_values() && | |
| 1142 | 3011 o->klass() == SystemDictionary::String_klass()) { |
| 0 | 3012 if (!CallbackInvoker::report_string_value(o)) { |
| 3013 return false; | |
| 3014 } | |
| 3015 } | |
| 3016 return true; | |
| 3017 } | |
| 3018 | |
| 3019 | |
| 3020 // collects all simple (non-stack) roots. | |
| 3021 // if there's a heap root callback provided then the callback is | |
| 3022 // invoked for each simple root. | |
| 3023 // if an object reference callback is provided then all simple | |
| 3024 // roots are pushed onto the marking stack so that they can be | |
| 3025 // processed later | |
| 3026 // | |
| 3027 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
| 3028 SimpleRootsClosure blk; | |
| 3029 | |
| 3030 // JNI globals | |
| 3031 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
| 3032 JNIHandles::oops_do(&blk); | |
| 3033 if (blk.stopped()) { | |
| 3034 return false; | |
| 3035 } | |
| 3036 | |
| 3037 // Preloaded classes and loader from the system dictionary | |
| 3038 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
| 3039 SystemDictionary::always_strong_oops_do(&blk); | |
| 3040 if (blk.stopped()) { | |
| 3041 return false; | |
| 3042 } | |
| 3043 | |
| 3044 // Inflated monitors | |
| 3045 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
| 3046 ObjectSynchronizer::oops_do(&blk); | |
| 3047 if (blk.stopped()) { | |
| 3048 return false; | |
| 3049 } | |
| 3050 | |
| 3051 // Threads | |
| 3052 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
| 3053 oop threadObj = thread->threadObj(); | |
| 3054 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
| 3055 bool cont = CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, threadObj); | |
| 3056 if (!cont) { | |
| 3057 return false; | |
| 3058 } | |
| 3059 } | |
| 3060 } | |
| 3061 | |
| 3062 // Other kinds of roots maintained by HotSpot | |
| 3063 // Many of these won't be visible but others (such as instances of important | |
| 3064 // exceptions) will be visible. | |
| 3065 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
| 3066 Universe::oops_do(&blk); | |
|
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|
3067 |
|
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|
3068 // If there are any non-perm roots in the code cache, visit them. |
|
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diff
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|
3069 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
|
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diff
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|
3070 CodeBlobToOopClosure look_in_blobs(&blk, false); |
|
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|
3071 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
|
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|
3072 |
| 0 | 3073 return true; |
| 3074 } | |
| 3075 | |
| 3076 // Walk the stack of a given thread and find all references (locals | |
| 3077 // and JNI calls) and report these as stack references | |
| 3078 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
| 3079 JNILocalRootsClosure* blk) | |
| 3080 { | |
| 3081 oop threadObj = java_thread->threadObj(); | |
| 3082 assert(threadObj != NULL, "sanity check"); | |
| 3083 | |
| 3084 // only need to get the thread's tag once per thread | |
| 3085 jlong thread_tag = tag_for(_tag_map, threadObj); | |
| 3086 | |
| 3087 // also need the thread id | |
| 3088 jlong tid = java_lang_Thread::thread_id(threadObj); | |
| 3089 | |
| 3090 | |
| 3091 if (java_thread->has_last_Java_frame()) { | |
| 3092 | |
| 3093 // vframes are resource allocated | |
| 3094 Thread* current_thread = Thread::current(); | |
| 3095 ResourceMark rm(current_thread); | |
| 3096 HandleMark hm(current_thread); | |
| 3097 | |
| 3098 RegisterMap reg_map(java_thread); | |
| 3099 frame f = java_thread->last_frame(); | |
| 3100 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
| 3101 | |
| 3102 bool is_top_frame = true; | |
| 3103 int depth = 0; | |
| 3104 frame* last_entry_frame = NULL; | |
| 3105 | |
| 3106 while (vf != NULL) { | |
| 3107 if (vf->is_java_frame()) { | |
| 3108 | |
| 3109 // java frame (interpreted, compiled, ...) | |
| 3110 javaVFrame *jvf = javaVFrame::cast(vf); | |
| 3111 | |
| 3112 // the jmethodID | |
| 3113 jmethodID method = jvf->method()->jmethod_id(); | |
| 3114 | |
| 3115 if (!(jvf->method()->is_native())) { | |
| 3116 jlocation bci = (jlocation)jvf->bci(); | |
| 3117 StackValueCollection* locals = jvf->locals(); | |
| 3118 for (int slot=0; slot<locals->size(); slot++) { | |
| 3119 if (locals->at(slot)->type() == T_OBJECT) { | |
| 3120 oop o = locals->obj_at(slot)(); | |
| 3121 if (o == NULL) { | |
| 3122 continue; | |
| 3123 } | |
| 3124 | |
| 3125 // stack reference | |
| 3126 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
| 3127 bci, slot, o)) { | |
| 3128 return false; | |
| 3129 } | |
| 3130 } | |
| 3131 } | |
| 3132 } else { | |
| 3133 blk->set_context(thread_tag, tid, depth, method); | |
| 3134 if (is_top_frame) { | |
| 3135 // JNI locals for the top frame. | |
| 3136 java_thread->active_handles()->oops_do(blk); | |
| 3137 } else { | |
| 3138 if (last_entry_frame != NULL) { | |
| 3139 // JNI locals for the entry frame | |
| 3140 assert(last_entry_frame->is_entry_frame(), "checking"); | |
| 3141 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
| 3142 } | |
| 3143 } | |
| 3144 } | |
| 3145 last_entry_frame = NULL; | |
| 3146 depth++; | |
| 3147 } else { | |
| 3148 // externalVFrame - for an entry frame then we report the JNI locals | |
| 3149 // when we find the corresponding javaVFrame | |
| 3150 frame* fr = vf->frame_pointer(); | |
| 3151 assert(fr != NULL, "sanity check"); | |
| 3152 if (fr->is_entry_frame()) { | |
| 3153 last_entry_frame = fr; | |
| 3154 } | |
| 3155 } | |
| 3156 | |
| 3157 vf = vf->sender(); | |
| 3158 is_top_frame = false; | |
| 3159 } | |
| 3160 } else { | |
| 3161 // no last java frame but there may be JNI locals | |
| 3162 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
| 3163 java_thread->active_handles()->oops_do(blk); | |
| 3164 } | |
| 3165 return true; | |
| 3166 } | |
| 3167 | |
| 3168 | |
| 3169 // collects all stack roots - for each thread it walks the execution | |
| 3170 // stack to find all references and local JNI refs. | |
| 3171 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
| 3172 JNILocalRootsClosure blk; | |
| 3173 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
| 3174 oop threadObj = thread->threadObj(); | |
| 3175 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
| 3176 if (!collect_stack_roots(thread, &blk)) { | |
| 3177 return false; | |
| 3178 } | |
| 3179 } | |
| 3180 } | |
| 3181 return true; | |
| 3182 } | |
| 3183 | |
| 3184 // visit an object | |
| 3185 // first mark the object as visited | |
| 3186 // second get all the outbound references from this object (in other words, all | |
| 3187 // the objects referenced by this object). | |
| 3188 // | |
| 3189 bool VM_HeapWalkOperation::visit(oop o) { | |
| 3190 // mark object as visited | |
| 3191 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
| 3192 ObjectMarker::mark(o); | |
| 3193 | |
| 3194 // instance | |
| 3195 if (o->is_instance()) { | |
| 1142 | 3196 if (o->klass() == SystemDictionary::Class_klass()) { |
| 0 | 3197 o = klassOop_if_java_lang_Class(o); |
| 3198 if (o->is_klass()) { | |
| 3199 // a java.lang.Class | |
| 3200 return iterate_over_class(klassOop(o)); | |
| 3201 } | |
| 3202 } else { | |
| 3203 return iterate_over_object(o); | |
| 3204 } | |
| 3205 } | |
| 3206 | |
| 3207 // object array | |
| 3208 if (o->is_objArray()) { | |
| 3209 return iterate_over_array(o); | |
| 3210 } | |
| 3211 | |
| 3212 // type array | |
| 3213 if (o->is_typeArray()) { | |
| 3214 return iterate_over_type_array(o); | |
| 3215 } | |
| 3216 | |
| 3217 return true; | |
| 3218 } | |
| 3219 | |
| 3220 void VM_HeapWalkOperation::doit() { | |
| 3221 ResourceMark rm; | |
| 3222 ObjectMarkerController marker; | |
| 3223 ClassFieldMapCacheMark cm; | |
| 3224 | |
| 3225 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
| 3226 | |
| 3227 // the heap walk starts with an initial object or the heap roots | |
| 3228 if (initial_object().is_null()) { | |
| 3229 if (!collect_simple_roots()) return; | |
| 3230 if (!collect_stack_roots()) return; | |
| 3231 } else { | |
| 3232 visit_stack()->push(initial_object()()); | |
| 3233 } | |
| 3234 | |
| 3235 // object references required | |
| 3236 if (is_following_references()) { | |
| 3237 | |
| 3238 // visit each object until all reachable objects have been | |
| 3239 // visited or the callback asked to terminate the iteration. | |
| 3240 while (!visit_stack()->is_empty()) { | |
| 3241 oop o = visit_stack()->pop(); | |
| 3242 if (!ObjectMarker::visited(o)) { | |
| 3243 if (!visit(o)) { | |
| 3244 break; | |
| 3245 } | |
| 3246 } | |
| 3247 } | |
| 3248 } | |
| 3249 } | |
| 3250 | |
| 3251 // iterate over all objects that are reachable from a set of roots | |
| 3252 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
| 3253 jvmtiStackReferenceCallback stack_ref_callback, | |
| 3254 jvmtiObjectReferenceCallback object_ref_callback, | |
| 3255 const void* user_data) { | |
| 3256 MutexLocker ml(Heap_lock); | |
| 3257 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
| 3258 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
| 3259 VMThread::execute(&op); | |
| 3260 } | |
| 3261 | |
| 3262 // iterate over all objects that are reachable from a given object | |
| 3263 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
| 3264 jvmtiObjectReferenceCallback object_ref_callback, | |
| 3265 const void* user_data) { | |
| 3266 oop obj = JNIHandles::resolve(object); | |
| 3267 Handle initial_object(Thread::current(), obj); | |
| 3268 | |
| 3269 MutexLocker ml(Heap_lock); | |
| 3270 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
| 3271 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
| 3272 VMThread::execute(&op); | |
| 3273 } | |
| 3274 | |
| 3275 // follow references from an initial object or the GC roots | |
| 3276 void JvmtiTagMap::follow_references(jint heap_filter, | |
| 3277 KlassHandle klass, | |
| 3278 jobject object, | |
| 3279 const jvmtiHeapCallbacks* callbacks, | |
| 3280 const void* user_data) | |
| 3281 { | |
| 3282 oop obj = JNIHandles::resolve(object); | |
| 3283 Handle initial_object(Thread::current(), obj); | |
| 3284 | |
| 3285 MutexLocker ml(Heap_lock); | |
| 3286 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
| 3287 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
| 3288 VMThread::execute(&op); | |
| 3289 } | |
| 3290 | |
| 3291 | |
|
2125
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|
3292 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)
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2125
diff
changeset
|
3293 // 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)
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parents:
2125
diff
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|
3294 // 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)
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parents:
2125
diff
changeset
|
3295 // 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)
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parents:
2125
diff
changeset
|
3296 assert(Threads::number_of_threads() <= 1 || |
|
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
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parents:
2125
diff
changeset
|
3297 SafepointSynchronize::is_at_safepoint(), |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
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|
3298 "must be executed at a safepoint"); |
| 0 | 3299 if (JvmtiEnv::environments_might_exist()) { |
| 3300 JvmtiEnvIterator it; | |
| 3301 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
| 3302 JvmtiTagMap* tag_map = env->tag_map(); | |
| 3303 if (tag_map != NULL && !tag_map->is_empty()) { | |
|
2125
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diff
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|
3304 tag_map->do_weak_oops(is_alive, f); |
| 0 | 3305 } |
| 3306 } | |
| 3307 } | |
| 3308 } | |
| 3309 | |
|
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3310 void JvmtiTagMap::do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f) { |
| 0 | 3311 |
| 3312 // does this environment have the OBJECT_FREE event enabled | |
| 3313 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
| 3314 | |
| 3315 // counters used for trace message | |
| 3316 int freed = 0; | |
| 3317 int moved = 0; | |
|
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
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|
3318 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
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|
3319 JvmtiTagHashmap* hashmap = this->hashmap(); |
| 0 | 3320 |
| 3321 // reenable sizing (if disabled) | |
|
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
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|
3322 hashmap->set_resizing_enabled(true); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
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|
3323 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3324 // if the hashmap is empty then we can skip it |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3325 if (hashmap->_entry_count == 0) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3326 return; |
| 0 | 3327 } |
| 3328 | |
|
2125
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diff
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|
3329 // now iterate through each entry in the table |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3330 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3331 JvmtiTagHashmapEntry** table = hashmap->table(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3332 int size = hashmap->size(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3333 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3334 JvmtiTagHashmapEntry* delayed_add = NULL; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3335 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3336 for (int pos = 0; pos < size; ++pos) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3337 JvmtiTagHashmapEntry* entry = table[pos]; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3338 JvmtiTagHashmapEntry* prev = NULL; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3339 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3340 while (entry != NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3341 JvmtiTagHashmapEntry* next = entry->next(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3342 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3343 oop* obj = entry->object_addr(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3344 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3345 // has object been GC'ed |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3346 if (!is_alive->do_object_b(entry->object())) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3347 // grab the tag |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3348 jlong tag = entry->tag(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3349 guarantee(tag != 0, "checking"); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3350 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3351 // remove GC'ed entry from hashmap and return the |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3352 // entry to the free list |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3353 hashmap->remove(prev, pos, entry); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3354 destroy_entry(entry); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3355 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3356 // post the event to the profiler |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3357 if (post_object_free) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3358 JvmtiExport::post_object_free(env(), tag); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3359 } |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3360 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3361 ++freed; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3362 } else { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3363 f->do_oop(entry->object_addr()); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3364 oop new_oop = entry->object(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3365 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3366 // 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
|
3367 // entry to its new location. |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3368 unsigned int new_pos = JvmtiTagHashmap::hash(new_oop, size); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3369 if (new_pos != (unsigned int)pos) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3370 if (prev == NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3371 table[pos] = next; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3372 } else { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3373 prev->set_next(next); |
| 0 | 3374 } |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3375 if (new_pos < (unsigned int)pos) { |
| 0 | 3376 entry->set_next(table[new_pos]); |
| 3377 table[new_pos] = entry; | |
| 3378 } else { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3379 // 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
|
3380 // hitting it again during this iteration. |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3381 entry->set_next(delayed_add); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3382 delayed_add = entry; |
| 0 | 3383 } |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3384 moved++; |
| 0 | 3385 } else { |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3386 // object didn't move |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3387 prev = entry; |
| 0 | 3388 } |
| 3389 } | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3390 |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3391 entry = next; |
| 0 | 3392 } |
| 3393 } | |
| 3394 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3395 // Re-add all the entries which were kept aside |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3396 while (delayed_add != NULL) { |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3397 JvmtiTagHashmapEntry* next = delayed_add->next(); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3398 unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3399 delayed_add->set_next(table[pos]); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3400 table[pos] = delayed_add; |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3401 delayed_add = next; |
| 0 | 3402 } |
| 3403 | |
| 3404 // stats | |
| 3405 if (TraceJVMTIObjectTagging) { | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3406 int post_total = hashmap->_entry_count; |
| 0 | 3407 int pre_total = post_total + freed; |
| 3408 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3409 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
|
3410 pre_total, post_total, freed, moved); |
| 0 | 3411 } |
| 3412 } |