Fri, 10 Jul 2009 11:10:00 -0700
6857194: Add hotspot perf counters to aid class loading performance measurement
Summary: Add new jvmstat counters to measure detailed class loading time
Reviewed-by: acorn, kamg
duke@435 | 1 | /* |
xdono@1014 | 2 | * Copyright 2003-2009 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_jvmtiTagMap.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | // JvmtiTagHashmapEntry |
duke@435 | 29 | // |
duke@435 | 30 | // Each entry encapsulates a JNI weak reference to the tagged object |
duke@435 | 31 | // and the tag value. In addition an entry includes a next pointer which |
duke@435 | 32 | // is used to chain entries together. |
duke@435 | 33 | |
duke@435 | 34 | class JvmtiTagHashmapEntry : public CHeapObj { |
duke@435 | 35 | private: |
duke@435 | 36 | friend class JvmtiTagMap; |
duke@435 | 37 | |
duke@435 | 38 | jweak _object; // JNI weak ref to tagged object |
duke@435 | 39 | jlong _tag; // the tag |
duke@435 | 40 | JvmtiTagHashmapEntry* _next; // next on the list |
duke@435 | 41 | |
duke@435 | 42 | inline void init(jweak object, jlong tag) { |
duke@435 | 43 | _object = object; |
duke@435 | 44 | _tag = tag; |
duke@435 | 45 | _next = NULL; |
duke@435 | 46 | } |
duke@435 | 47 | |
duke@435 | 48 | // constructor |
duke@435 | 49 | JvmtiTagHashmapEntry(jweak object, jlong tag) { init(object, tag); } |
duke@435 | 50 | |
duke@435 | 51 | public: |
duke@435 | 52 | |
duke@435 | 53 | // accessor methods |
duke@435 | 54 | inline jweak object() const { return _object; } |
duke@435 | 55 | inline jlong tag() const { return _tag; } |
duke@435 | 56 | |
duke@435 | 57 | inline void set_tag(jlong tag) { |
duke@435 | 58 | assert(tag != 0, "can't be zero"); |
duke@435 | 59 | _tag = tag; |
duke@435 | 60 | } |
duke@435 | 61 | |
duke@435 | 62 | inline JvmtiTagHashmapEntry* next() const { return _next; } |
duke@435 | 63 | inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; } |
duke@435 | 64 | }; |
duke@435 | 65 | |
duke@435 | 66 | |
duke@435 | 67 | // JvmtiTagHashmap |
duke@435 | 68 | // |
duke@435 | 69 | // A hashmap is essentially a table of pointers to entries. Entries |
duke@435 | 70 | // are hashed to a location, or position in the table, and then |
duke@435 | 71 | // chained from that location. The "key" for hashing is address of |
duke@435 | 72 | // the object, or oop. The "value" is the JNI weak reference to the |
duke@435 | 73 | // object and the tag value. Keys are not stored with the entry. |
duke@435 | 74 | // Instead the weak reference is resolved to obtain the key. |
duke@435 | 75 | // |
duke@435 | 76 | // A hashmap maintains a count of the number entries in the hashmap |
duke@435 | 77 | // and resizes if the number of entries exceeds a given threshold. |
duke@435 | 78 | // The threshold is specified as a percentage of the size - for |
duke@435 | 79 | // example a threshold of 0.75 will trigger the hashmap to resize |
duke@435 | 80 | // if the number of entries is >75% of table size. |
duke@435 | 81 | // |
duke@435 | 82 | // A hashmap provides functions for adding, removing, and finding |
duke@435 | 83 | // entries. It also provides a function to iterate over all entries |
duke@435 | 84 | // in the hashmap. |
duke@435 | 85 | |
duke@435 | 86 | class JvmtiTagHashmap : public CHeapObj { |
duke@435 | 87 | private: |
duke@435 | 88 | friend class JvmtiTagMap; |
duke@435 | 89 | |
duke@435 | 90 | enum { |
duke@435 | 91 | small_trace_threshold = 10000, // threshold for tracing |
duke@435 | 92 | medium_trace_threshold = 100000, |
duke@435 | 93 | large_trace_threshold = 1000000, |
duke@435 | 94 | initial_trace_threshold = small_trace_threshold |
duke@435 | 95 | }; |
duke@435 | 96 | |
duke@435 | 97 | static int _sizes[]; // array of possible hashmap sizes |
duke@435 | 98 | int _size; // actual size of the table |
duke@435 | 99 | int _size_index; // index into size table |
duke@435 | 100 | |
duke@435 | 101 | int _entry_count; // number of entries in the hashmap |
duke@435 | 102 | |
duke@435 | 103 | float _load_factor; // load factor as a % of the size |
duke@435 | 104 | int _resize_threshold; // computed threshold to trigger resizing. |
duke@435 | 105 | bool _resizing_enabled; // indicates if hashmap can resize |
duke@435 | 106 | |
duke@435 | 107 | int _trace_threshold; // threshold for trace messages |
duke@435 | 108 | |
duke@435 | 109 | JvmtiTagHashmapEntry** _table; // the table of entries. |
duke@435 | 110 | |
duke@435 | 111 | // private accessors |
duke@435 | 112 | int resize_threshold() const { return _resize_threshold; } |
duke@435 | 113 | int trace_threshold() const { return _trace_threshold; } |
duke@435 | 114 | |
duke@435 | 115 | // initialize the hashmap |
duke@435 | 116 | void init(int size_index=0, float load_factor=4.0f) { |
duke@435 | 117 | int initial_size = _sizes[size_index]; |
duke@435 | 118 | _size_index = size_index; |
duke@435 | 119 | _size = initial_size; |
duke@435 | 120 | _entry_count = 0; |
duke@435 | 121 | if (TraceJVMTIObjectTagging) { |
duke@435 | 122 | _trace_threshold = initial_trace_threshold; |
duke@435 | 123 | } else { |
duke@435 | 124 | _trace_threshold = -1; |
duke@435 | 125 | } |
duke@435 | 126 | _load_factor = load_factor; |
duke@435 | 127 | _resize_threshold = (int)(_load_factor * _size); |
duke@435 | 128 | _resizing_enabled = true; |
duke@435 | 129 | size_t s = initial_size * sizeof(JvmtiTagHashmapEntry*); |
duke@435 | 130 | _table = (JvmtiTagHashmapEntry**)os::malloc(s); |
duke@435 | 131 | if (_table == NULL) { |
duke@435 | 132 | vm_exit_out_of_memory(s, "unable to allocate initial hashtable for jvmti object tags"); |
duke@435 | 133 | } |
duke@435 | 134 | for (int i=0; i<initial_size; i++) { |
duke@435 | 135 | _table[i] = NULL; |
duke@435 | 136 | } |
duke@435 | 137 | } |
duke@435 | 138 | |
duke@435 | 139 | // hash a given key (oop) with the specified size |
duke@435 | 140 | static unsigned int hash(oop key, int size) { |
duke@435 | 141 | // shift right to get better distribution (as these bits will be zero |
duke@435 | 142 | // with aligned addresses) |
duke@435 | 143 | unsigned int addr = (unsigned int)((intptr_t)key); |
duke@435 | 144 | #ifdef _LP64 |
duke@435 | 145 | return (addr >> 3) % size; |
duke@435 | 146 | #else |
duke@435 | 147 | return (addr >> 2) % size; |
duke@435 | 148 | #endif |
duke@435 | 149 | } |
duke@435 | 150 | |
duke@435 | 151 | // hash a given key (oop) |
duke@435 | 152 | unsigned int hash(oop key) { |
duke@435 | 153 | return hash(key, _size); |
duke@435 | 154 | } |
duke@435 | 155 | |
duke@435 | 156 | // resize the hashmap - allocates a large table and re-hashes |
duke@435 | 157 | // all entries into the new table. |
duke@435 | 158 | void resize() { |
duke@435 | 159 | int new_size_index = _size_index+1; |
duke@435 | 160 | int new_size = _sizes[new_size_index]; |
duke@435 | 161 | if (new_size < 0) { |
duke@435 | 162 | // hashmap already at maximum capacity |
duke@435 | 163 | return; |
duke@435 | 164 | } |
duke@435 | 165 | |
duke@435 | 166 | // allocate new table |
duke@435 | 167 | size_t s = new_size * sizeof(JvmtiTagHashmapEntry*); |
duke@435 | 168 | JvmtiTagHashmapEntry** new_table = (JvmtiTagHashmapEntry**)os::malloc(s); |
duke@435 | 169 | if (new_table == NULL) { |
duke@435 | 170 | warning("unable to allocate larger hashtable for jvmti object tags"); |
duke@435 | 171 | set_resizing_enabled(false); |
duke@435 | 172 | return; |
duke@435 | 173 | } |
duke@435 | 174 | |
duke@435 | 175 | // initialize new table |
duke@435 | 176 | int i; |
duke@435 | 177 | for (i=0; i<new_size; i++) { |
duke@435 | 178 | new_table[i] = NULL; |
duke@435 | 179 | } |
duke@435 | 180 | |
duke@435 | 181 | // rehash all entries into the new table |
duke@435 | 182 | for (i=0; i<_size; i++) { |
duke@435 | 183 | JvmtiTagHashmapEntry* entry = _table[i]; |
duke@435 | 184 | while (entry != NULL) { |
duke@435 | 185 | JvmtiTagHashmapEntry* next = entry->next(); |
duke@435 | 186 | oop key = JNIHandles::resolve(entry->object()); |
duke@435 | 187 | assert(key != NULL, "jni weak reference cleared!!"); |
duke@435 | 188 | unsigned int h = hash(key, new_size); |
duke@435 | 189 | JvmtiTagHashmapEntry* anchor = new_table[h]; |
duke@435 | 190 | if (anchor == NULL) { |
duke@435 | 191 | new_table[h] = entry; |
duke@435 | 192 | entry->set_next(NULL); |
duke@435 | 193 | } else { |
duke@435 | 194 | entry->set_next(anchor); |
duke@435 | 195 | new_table[h] = entry; |
duke@435 | 196 | } |
duke@435 | 197 | entry = next; |
duke@435 | 198 | } |
duke@435 | 199 | } |
duke@435 | 200 | |
duke@435 | 201 | // free old table and update settings. |
duke@435 | 202 | os::free((void*)_table); |
duke@435 | 203 | _table = new_table; |
duke@435 | 204 | _size_index = new_size_index; |
duke@435 | 205 | _size = new_size; |
duke@435 | 206 | |
duke@435 | 207 | // compute new resize threshold |
duke@435 | 208 | _resize_threshold = (int)(_load_factor * _size); |
duke@435 | 209 | } |
duke@435 | 210 | |
duke@435 | 211 | |
duke@435 | 212 | // internal remove function - remove an entry at a given position in the |
duke@435 | 213 | // table. |
duke@435 | 214 | inline void remove(JvmtiTagHashmapEntry* prev, int pos, JvmtiTagHashmapEntry* entry) { |
duke@435 | 215 | assert(pos >= 0 && pos < _size, "out of range"); |
duke@435 | 216 | if (prev == NULL) { |
duke@435 | 217 | _table[pos] = entry->next(); |
duke@435 | 218 | } else { |
duke@435 | 219 | prev->set_next(entry->next()); |
duke@435 | 220 | } |
duke@435 | 221 | assert(_entry_count > 0, "checking"); |
duke@435 | 222 | _entry_count--; |
duke@435 | 223 | } |
duke@435 | 224 | |
duke@435 | 225 | // resizing switch |
duke@435 | 226 | bool is_resizing_enabled() const { return _resizing_enabled; } |
duke@435 | 227 | void set_resizing_enabled(bool enable) { _resizing_enabled = enable; } |
duke@435 | 228 | |
duke@435 | 229 | // debugging |
duke@435 | 230 | void print_memory_usage(); |
duke@435 | 231 | void compute_next_trace_threshold(); |
duke@435 | 232 | |
duke@435 | 233 | public: |
duke@435 | 234 | |
duke@435 | 235 | // create a JvmtiTagHashmap of a preferred size and optionally a load factor. |
duke@435 | 236 | // The preferred size is rounded down to an actual size. |
duke@435 | 237 | JvmtiTagHashmap(int size, float load_factor=0.0f) { |
duke@435 | 238 | int i=0; |
duke@435 | 239 | while (_sizes[i] < size) { |
duke@435 | 240 | if (_sizes[i] < 0) { |
duke@435 | 241 | assert(i > 0, "sanity check"); |
duke@435 | 242 | i--; |
duke@435 | 243 | break; |
duke@435 | 244 | } |
duke@435 | 245 | i++; |
duke@435 | 246 | } |
duke@435 | 247 | |
duke@435 | 248 | // if a load factor is specified then use it, otherwise use default |
duke@435 | 249 | if (load_factor > 0.01f) { |
duke@435 | 250 | init(i, load_factor); |
duke@435 | 251 | } else { |
duke@435 | 252 | init(i); |
duke@435 | 253 | } |
duke@435 | 254 | } |
duke@435 | 255 | |
duke@435 | 256 | // create a JvmtiTagHashmap with default settings |
duke@435 | 257 | JvmtiTagHashmap() { |
duke@435 | 258 | init(); |
duke@435 | 259 | } |
duke@435 | 260 | |
duke@435 | 261 | // release table when JvmtiTagHashmap destroyed |
duke@435 | 262 | ~JvmtiTagHashmap() { |
duke@435 | 263 | if (_table != NULL) { |
duke@435 | 264 | os::free((void*)_table); |
duke@435 | 265 | _table = NULL; |
duke@435 | 266 | } |
duke@435 | 267 | } |
duke@435 | 268 | |
duke@435 | 269 | // accessors |
duke@435 | 270 | int size() const { return _size; } |
duke@435 | 271 | JvmtiTagHashmapEntry** table() const { return _table; } |
duke@435 | 272 | int entry_count() const { return _entry_count; } |
duke@435 | 273 | |
duke@435 | 274 | // find an entry in the hashmap, returns NULL if not found. |
duke@435 | 275 | inline JvmtiTagHashmapEntry* find(oop key) { |
duke@435 | 276 | unsigned int h = hash(key); |
duke@435 | 277 | JvmtiTagHashmapEntry* entry = _table[h]; |
duke@435 | 278 | while (entry != NULL) { |
duke@435 | 279 | oop orig_key = JNIHandles::resolve(entry->object()); |
duke@435 | 280 | assert(orig_key != NULL, "jni weak reference cleared!!"); |
duke@435 | 281 | if (key == orig_key) { |
duke@435 | 282 | break; |
duke@435 | 283 | } |
duke@435 | 284 | entry = entry->next(); |
duke@435 | 285 | } |
duke@435 | 286 | return entry; |
duke@435 | 287 | } |
duke@435 | 288 | |
duke@435 | 289 | |
duke@435 | 290 | // add a new entry to hashmap |
duke@435 | 291 | inline void add(oop key, JvmtiTagHashmapEntry* entry) { |
duke@435 | 292 | assert(key != NULL, "checking"); |
duke@435 | 293 | assert(find(key) == NULL, "duplicate detected"); |
duke@435 | 294 | unsigned int h = hash(key); |
duke@435 | 295 | JvmtiTagHashmapEntry* anchor = _table[h]; |
duke@435 | 296 | if (anchor == NULL) { |
duke@435 | 297 | _table[h] = entry; |
duke@435 | 298 | entry->set_next(NULL); |
duke@435 | 299 | } else { |
duke@435 | 300 | entry->set_next(anchor); |
duke@435 | 301 | _table[h] = entry; |
duke@435 | 302 | } |
duke@435 | 303 | |
duke@435 | 304 | _entry_count++; |
duke@435 | 305 | if (trace_threshold() > 0 && entry_count() >= trace_threshold()) { |
duke@435 | 306 | assert(TraceJVMTIObjectTagging, "should only get here when tracing"); |
duke@435 | 307 | print_memory_usage(); |
duke@435 | 308 | compute_next_trace_threshold(); |
duke@435 | 309 | } |
duke@435 | 310 | |
duke@435 | 311 | // if the number of entries exceed the threshold then resize |
duke@435 | 312 | if (entry_count() > resize_threshold() && is_resizing_enabled()) { |
duke@435 | 313 | resize(); |
duke@435 | 314 | } |
duke@435 | 315 | } |
duke@435 | 316 | |
duke@435 | 317 | // remove an entry with the given key. |
duke@435 | 318 | inline JvmtiTagHashmapEntry* remove(oop key) { |
duke@435 | 319 | unsigned int h = hash(key); |
duke@435 | 320 | JvmtiTagHashmapEntry* entry = _table[h]; |
duke@435 | 321 | JvmtiTagHashmapEntry* prev = NULL; |
duke@435 | 322 | while (entry != NULL) { |
duke@435 | 323 | oop orig_key = JNIHandles::resolve(entry->object()); |
duke@435 | 324 | assert(orig_key != NULL, "jni weak reference cleared!!"); |
duke@435 | 325 | if (key == orig_key) { |
duke@435 | 326 | break; |
duke@435 | 327 | } |
duke@435 | 328 | prev = entry; |
duke@435 | 329 | entry = entry->next(); |
duke@435 | 330 | } |
duke@435 | 331 | if (entry != NULL) { |
duke@435 | 332 | remove(prev, h, entry); |
duke@435 | 333 | } |
duke@435 | 334 | return entry; |
duke@435 | 335 | } |
duke@435 | 336 | |
duke@435 | 337 | // iterate over all entries in the hashmap |
duke@435 | 338 | void entry_iterate(JvmtiTagHashmapEntryClosure* closure); |
duke@435 | 339 | }; |
duke@435 | 340 | |
duke@435 | 341 | // possible hashmap sizes - odd primes that roughly double in size. |
duke@435 | 342 | // To avoid excessive resizing the odd primes from 4801-76831 and |
duke@435 | 343 | // 76831-307261 have been removed. The list must be terminated by -1. |
duke@435 | 344 | int JvmtiTagHashmap::_sizes[] = { 4801, 76831, 307261, 614563, 1228891, |
duke@435 | 345 | 2457733, 4915219, 9830479, 19660831, 39321619, 78643219, -1 }; |
duke@435 | 346 | |
duke@435 | 347 | |
duke@435 | 348 | // A supporting class for iterating over all entries in Hashmap |
duke@435 | 349 | class JvmtiTagHashmapEntryClosure { |
duke@435 | 350 | public: |
duke@435 | 351 | virtual void do_entry(JvmtiTagHashmapEntry* entry) = 0; |
duke@435 | 352 | }; |
duke@435 | 353 | |
duke@435 | 354 | |
duke@435 | 355 | // iterate over all entries in the hashmap |
duke@435 | 356 | void JvmtiTagHashmap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { |
duke@435 | 357 | for (int i=0; i<_size; i++) { |
duke@435 | 358 | JvmtiTagHashmapEntry* entry = _table[i]; |
duke@435 | 359 | JvmtiTagHashmapEntry* prev = NULL; |
duke@435 | 360 | while (entry != NULL) { |
duke@435 | 361 | // obtain the next entry before invoking do_entry - this is |
duke@435 | 362 | // necessary because do_entry may remove the entry from the |
duke@435 | 363 | // hashmap. |
duke@435 | 364 | JvmtiTagHashmapEntry* next = entry->next(); |
duke@435 | 365 | closure->do_entry(entry); |
duke@435 | 366 | entry = next; |
duke@435 | 367 | } |
duke@435 | 368 | } |
duke@435 | 369 | } |
duke@435 | 370 | |
duke@435 | 371 | // debugging |
duke@435 | 372 | void JvmtiTagHashmap::print_memory_usage() { |
duke@435 | 373 | intptr_t p = (intptr_t)this; |
duke@435 | 374 | tty->print("[JvmtiTagHashmap @ " INTPTR_FORMAT, p); |
duke@435 | 375 | |
duke@435 | 376 | // table + entries in KB |
duke@435 | 377 | int hashmap_usage = (size()*sizeof(JvmtiTagHashmapEntry*) + |
duke@435 | 378 | entry_count()*sizeof(JvmtiTagHashmapEntry))/K; |
duke@435 | 379 | |
duke@435 | 380 | int weak_globals_usage = (int)(JNIHandles::weak_global_handle_memory_usage()/K); |
duke@435 | 381 | tty->print_cr(", %d entries (%d KB) <JNI weak globals: %d KB>]", |
duke@435 | 382 | entry_count(), hashmap_usage, weak_globals_usage); |
duke@435 | 383 | } |
duke@435 | 384 | |
duke@435 | 385 | // compute threshold for the next trace message |
duke@435 | 386 | void JvmtiTagHashmap::compute_next_trace_threshold() { |
duke@435 | 387 | if (trace_threshold() < medium_trace_threshold) { |
duke@435 | 388 | _trace_threshold += small_trace_threshold; |
duke@435 | 389 | } else { |
duke@435 | 390 | if (trace_threshold() < large_trace_threshold) { |
duke@435 | 391 | _trace_threshold += medium_trace_threshold; |
duke@435 | 392 | } else { |
duke@435 | 393 | _trace_threshold += large_trace_threshold; |
duke@435 | 394 | } |
duke@435 | 395 | } |
duke@435 | 396 | } |
duke@435 | 397 | |
duke@435 | 398 | // memory region for young generation |
duke@435 | 399 | MemRegion JvmtiTagMap::_young_gen; |
duke@435 | 400 | |
duke@435 | 401 | // get the memory region used for the young generation |
duke@435 | 402 | void JvmtiTagMap::get_young_generation() { |
ysr@777 | 403 | CollectedHeap* ch = Universe::heap(); |
ysr@777 | 404 | switch (ch->kind()) { |
ysr@777 | 405 | case (CollectedHeap::GenCollectedHeap): { |
ysr@777 | 406 | _young_gen = ((GenCollectedHeap*)ch)->get_gen(0)->reserved(); |
ysr@777 | 407 | break; |
ysr@777 | 408 | } |
duke@435 | 409 | #ifndef SERIALGC |
ysr@777 | 410 | case (CollectedHeap::ParallelScavengeHeap): { |
ysr@777 | 411 | _young_gen = ((ParallelScavengeHeap*)ch)->young_gen()->reserved(); |
ysr@777 | 412 | break; |
ysr@777 | 413 | } |
ysr@777 | 414 | case (CollectedHeap::G1CollectedHeap): { |
ysr@777 | 415 | // Until a more satisfactory solution is implemented, all |
ysr@777 | 416 | // oops in the tag map will require rehash at each gc. |
ysr@777 | 417 | // This is a correct, if extremely inefficient solution. |
ysr@777 | 418 | // See RFE 6621729 for related commentary. |
ysr@777 | 419 | _young_gen = ch->reserved_region(); |
ysr@777 | 420 | break; |
ysr@777 | 421 | } |
ysr@777 | 422 | #endif // !SERIALGC |
ysr@777 | 423 | default: |
ysr@777 | 424 | ShouldNotReachHere(); |
duke@435 | 425 | } |
duke@435 | 426 | } |
duke@435 | 427 | |
duke@435 | 428 | // returns true if oop is in the young generation |
duke@435 | 429 | inline bool JvmtiTagMap::is_in_young(oop o) { |
duke@435 | 430 | assert(_young_gen.start() != NULL, "checking"); |
duke@435 | 431 | void* p = (void*)o; |
duke@435 | 432 | bool in_young = _young_gen.contains(p); |
duke@435 | 433 | return in_young; |
duke@435 | 434 | } |
duke@435 | 435 | |
duke@435 | 436 | // returns the appropriate hashmap for a given object |
duke@435 | 437 | inline JvmtiTagHashmap* JvmtiTagMap::hashmap_for(oop o) { |
duke@435 | 438 | if (is_in_young(o)) { |
duke@435 | 439 | return _hashmap[0]; |
duke@435 | 440 | } else { |
duke@435 | 441 | return _hashmap[1]; |
duke@435 | 442 | } |
duke@435 | 443 | } |
duke@435 | 444 | |
duke@435 | 445 | |
duke@435 | 446 | // create a JvmtiTagMap |
duke@435 | 447 | JvmtiTagMap::JvmtiTagMap(JvmtiEnv* env) : |
duke@435 | 448 | _env(env), |
duke@435 | 449 | _lock(Mutex::nonleaf+2, "JvmtiTagMap._lock", false), |
duke@435 | 450 | _free_entries(NULL), |
duke@435 | 451 | _free_entries_count(0) |
duke@435 | 452 | { |
duke@435 | 453 | assert(JvmtiThreadState_lock->is_locked(), "sanity check"); |
duke@435 | 454 | assert(((JvmtiEnvBase *)env)->tag_map() == NULL, "tag map already exists for environment"); |
duke@435 | 455 | |
duke@435 | 456 | // create the hashmaps |
duke@435 | 457 | for (int i=0; i<n_hashmaps; i++) { |
duke@435 | 458 | _hashmap[i] = new JvmtiTagHashmap(); |
duke@435 | 459 | } |
duke@435 | 460 | |
duke@435 | 461 | // get the memory region used by the young generation |
duke@435 | 462 | get_young_generation(); |
duke@435 | 463 | |
duke@435 | 464 | // finally add us to the environment |
duke@435 | 465 | ((JvmtiEnvBase *)env)->set_tag_map(this); |
duke@435 | 466 | } |
duke@435 | 467 | |
duke@435 | 468 | |
duke@435 | 469 | // destroy a JvmtiTagMap |
duke@435 | 470 | JvmtiTagMap::~JvmtiTagMap() { |
duke@435 | 471 | |
duke@435 | 472 | // no lock acquired as we assume the enclosing environment is |
duke@435 | 473 | // also being destroryed. |
duke@435 | 474 | ((JvmtiEnvBase *)_env)->set_tag_map(NULL); |
duke@435 | 475 | |
duke@435 | 476 | // iterate over the hashmaps and destroy each of the entries |
duke@435 | 477 | for (int i=0; i<n_hashmaps; i++) { |
duke@435 | 478 | JvmtiTagHashmap* hashmap = _hashmap[i]; |
duke@435 | 479 | JvmtiTagHashmapEntry** table = hashmap->table(); |
duke@435 | 480 | for (int j=0; j<hashmap->size(); j++) { |
duke@435 | 481 | JvmtiTagHashmapEntry *entry = table[j]; |
duke@435 | 482 | while (entry != NULL) { |
duke@435 | 483 | JvmtiTagHashmapEntry* next = entry->next(); |
duke@435 | 484 | jweak ref = entry->object(); |
duke@435 | 485 | JNIHandles::destroy_weak_global(ref); |
duke@435 | 486 | delete entry; |
duke@435 | 487 | entry = next; |
duke@435 | 488 | } |
duke@435 | 489 | } |
duke@435 | 490 | |
duke@435 | 491 | // finally destroy the hashmap |
duke@435 | 492 | delete hashmap; |
duke@435 | 493 | } |
duke@435 | 494 | |
duke@435 | 495 | // remove any entries on the free list |
duke@435 | 496 | JvmtiTagHashmapEntry* entry = _free_entries; |
duke@435 | 497 | while (entry != NULL) { |
duke@435 | 498 | JvmtiTagHashmapEntry* next = entry->next(); |
duke@435 | 499 | delete entry; |
duke@435 | 500 | entry = next; |
duke@435 | 501 | } |
duke@435 | 502 | } |
duke@435 | 503 | |
duke@435 | 504 | // create a hashmap entry |
duke@435 | 505 | // - if there's an entry on the (per-environment) free list then this |
duke@435 | 506 | // is returned. Otherwise an new entry is allocated. |
duke@435 | 507 | JvmtiTagHashmapEntry* JvmtiTagMap::create_entry(jweak ref, jlong tag) { |
duke@435 | 508 | assert(Thread::current()->is_VM_thread() || is_locked(), "checking"); |
duke@435 | 509 | JvmtiTagHashmapEntry* entry; |
duke@435 | 510 | if (_free_entries == NULL) { |
duke@435 | 511 | entry = new JvmtiTagHashmapEntry(ref, tag); |
duke@435 | 512 | } else { |
duke@435 | 513 | assert(_free_entries_count > 0, "mismatched _free_entries_count"); |
duke@435 | 514 | _free_entries_count--; |
duke@435 | 515 | entry = _free_entries; |
duke@435 | 516 | _free_entries = entry->next(); |
duke@435 | 517 | entry->init(ref, tag); |
duke@435 | 518 | } |
duke@435 | 519 | return entry; |
duke@435 | 520 | } |
duke@435 | 521 | |
duke@435 | 522 | // destroy an entry by returning it to the free list |
duke@435 | 523 | void JvmtiTagMap::destroy_entry(JvmtiTagHashmapEntry* entry) { |
duke@435 | 524 | assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); |
duke@435 | 525 | // limit the size of the free list |
duke@435 | 526 | if (_free_entries_count >= max_free_entries) { |
duke@435 | 527 | delete entry; |
duke@435 | 528 | } else { |
duke@435 | 529 | entry->set_next(_free_entries); |
duke@435 | 530 | _free_entries = entry; |
duke@435 | 531 | _free_entries_count++; |
duke@435 | 532 | } |
duke@435 | 533 | } |
duke@435 | 534 | |
duke@435 | 535 | // returns the tag map for the given environments. If the tag map |
duke@435 | 536 | // doesn't exist then it is created. |
duke@435 | 537 | JvmtiTagMap* JvmtiTagMap::tag_map_for(JvmtiEnv* env) { |
duke@435 | 538 | JvmtiTagMap* tag_map = ((JvmtiEnvBase *)env)->tag_map(); |
duke@435 | 539 | if (tag_map == NULL) { |
duke@435 | 540 | MutexLocker mu(JvmtiThreadState_lock); |
duke@435 | 541 | tag_map = ((JvmtiEnvBase *)env)->tag_map(); |
duke@435 | 542 | if (tag_map == NULL) { |
duke@435 | 543 | tag_map = new JvmtiTagMap(env); |
duke@435 | 544 | } |
duke@435 | 545 | } else { |
duke@435 | 546 | CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); |
duke@435 | 547 | } |
duke@435 | 548 | return tag_map; |
duke@435 | 549 | } |
duke@435 | 550 | |
duke@435 | 551 | // iterate over all entries in the tag map. |
duke@435 | 552 | void JvmtiTagMap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { |
duke@435 | 553 | for (int i=0; i<n_hashmaps; i++) { |
duke@435 | 554 | JvmtiTagHashmap* hashmap = _hashmap[i]; |
duke@435 | 555 | hashmap->entry_iterate(closure); |
duke@435 | 556 | } |
duke@435 | 557 | } |
duke@435 | 558 | |
duke@435 | 559 | // returns true if the hashmaps are empty |
duke@435 | 560 | bool JvmtiTagMap::is_empty() { |
duke@435 | 561 | assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); |
duke@435 | 562 | assert(n_hashmaps == 2, "not implemented"); |
duke@435 | 563 | return ((_hashmap[0]->entry_count() == 0) && (_hashmap[1]->entry_count() == 0)); |
duke@435 | 564 | } |
duke@435 | 565 | |
duke@435 | 566 | |
duke@435 | 567 | // Return the tag value for an object, or 0 if the object is |
duke@435 | 568 | // not tagged |
duke@435 | 569 | // |
duke@435 | 570 | static inline jlong tag_for(JvmtiTagMap* tag_map, oop o) { |
duke@435 | 571 | JvmtiTagHashmapEntry* entry = tag_map->hashmap_for(o)->find(o); |
duke@435 | 572 | if (entry == NULL) { |
duke@435 | 573 | return 0; |
duke@435 | 574 | } else { |
duke@435 | 575 | return entry->tag(); |
duke@435 | 576 | } |
duke@435 | 577 | } |
duke@435 | 578 | |
duke@435 | 579 | // If the object is a java.lang.Class then return the klassOop, |
duke@435 | 580 | // otherwise return the original object |
duke@435 | 581 | static inline oop klassOop_if_java_lang_Class(oop o) { |
duke@435 | 582 | if (o->klass() == SystemDictionary::class_klass()) { |
duke@435 | 583 | if (!java_lang_Class::is_primitive(o)) { |
duke@435 | 584 | o = (oop)java_lang_Class::as_klassOop(o); |
duke@435 | 585 | assert(o != NULL, "class for non-primitive mirror must exist"); |
duke@435 | 586 | } |
duke@435 | 587 | } |
duke@435 | 588 | return o; |
duke@435 | 589 | } |
duke@435 | 590 | |
duke@435 | 591 | // A CallbackWrapper is a support class for querying and tagging an object |
duke@435 | 592 | // around a callback to a profiler. The constructor does pre-callback |
duke@435 | 593 | // work to get the tag value, klass tag value, ... and the destructor |
duke@435 | 594 | // does the post-callback work of tagging or untagging the object. |
duke@435 | 595 | // |
duke@435 | 596 | // { |
duke@435 | 597 | // CallbackWrapper wrapper(tag_map, o); |
duke@435 | 598 | // |
duke@435 | 599 | // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) |
duke@435 | 600 | // |
duke@435 | 601 | // } // wrapper goes out of scope here which results in the destructor |
duke@435 | 602 | // checking to see if the object has been tagged, untagged, or the |
duke@435 | 603 | // tag value has changed. |
duke@435 | 604 | // |
duke@435 | 605 | class CallbackWrapper : public StackObj { |
duke@435 | 606 | private: |
duke@435 | 607 | JvmtiTagMap* _tag_map; |
duke@435 | 608 | JvmtiTagHashmap* _hashmap; |
duke@435 | 609 | JvmtiTagHashmapEntry* _entry; |
duke@435 | 610 | oop _o; |
duke@435 | 611 | jlong _obj_size; |
duke@435 | 612 | jlong _obj_tag; |
duke@435 | 613 | klassOop _klass; // the object's class |
duke@435 | 614 | jlong _klass_tag; |
duke@435 | 615 | |
duke@435 | 616 | protected: |
duke@435 | 617 | JvmtiTagMap* tag_map() const { return _tag_map; } |
duke@435 | 618 | |
duke@435 | 619 | // invoked post-callback to tag, untag, or update the tag of an object |
duke@435 | 620 | void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, |
duke@435 | 621 | JvmtiTagHashmapEntry* entry, jlong obj_tag); |
duke@435 | 622 | public: |
duke@435 | 623 | CallbackWrapper(JvmtiTagMap* tag_map, oop o) { |
duke@435 | 624 | assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), |
duke@435 | 625 | "MT unsafe or must be VM thread"); |
duke@435 | 626 | |
duke@435 | 627 | // for Classes the klassOop is tagged |
duke@435 | 628 | _o = klassOop_if_java_lang_Class(o); |
duke@435 | 629 | |
duke@435 | 630 | // object size |
duke@435 | 631 | _obj_size = _o->size() * wordSize; |
duke@435 | 632 | |
duke@435 | 633 | // record the context |
duke@435 | 634 | _tag_map = tag_map; |
duke@435 | 635 | _hashmap = tag_map->hashmap_for(_o); |
duke@435 | 636 | _entry = _hashmap->find(_o); |
duke@435 | 637 | |
duke@435 | 638 | // get object tag |
duke@435 | 639 | _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); |
duke@435 | 640 | |
duke@435 | 641 | // get the class and the class's tag value |
duke@435 | 642 | if (_o == o) { |
duke@435 | 643 | _klass = _o->klass(); |
duke@435 | 644 | } else { |
duke@435 | 645 | // if the object represents a runtime class then use the |
duke@435 | 646 | // tag for java.lang.Class |
duke@435 | 647 | _klass = SystemDictionary::class_klass(); |
duke@435 | 648 | } |
duke@435 | 649 | _klass_tag = tag_for(tag_map, _klass); |
duke@435 | 650 | } |
duke@435 | 651 | |
duke@435 | 652 | ~CallbackWrapper() { |
duke@435 | 653 | post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); |
duke@435 | 654 | } |
duke@435 | 655 | |
duke@435 | 656 | inline jlong* obj_tag_p() { return &_obj_tag; } |
duke@435 | 657 | inline jlong obj_size() const { return _obj_size; } |
duke@435 | 658 | inline jlong obj_tag() const { return _obj_tag; } |
duke@435 | 659 | inline klassOop klass() const { return _klass; } |
duke@435 | 660 | inline jlong klass_tag() const { return _klass_tag; } |
duke@435 | 661 | }; |
duke@435 | 662 | |
duke@435 | 663 | |
duke@435 | 664 | |
duke@435 | 665 | // callback post-callback to tag, untag, or update the tag of an object |
duke@435 | 666 | void inline CallbackWrapper::post_callback_tag_update(oop o, |
duke@435 | 667 | JvmtiTagHashmap* hashmap, |
duke@435 | 668 | JvmtiTagHashmapEntry* entry, |
duke@435 | 669 | jlong obj_tag) { |
duke@435 | 670 | if (entry == NULL) { |
duke@435 | 671 | if (obj_tag != 0) { |
duke@435 | 672 | // callback has tagged the object |
duke@435 | 673 | assert(Thread::current()->is_VM_thread(), "must be VMThread"); |
duke@435 | 674 | HandleMark hm; |
duke@435 | 675 | Handle h(o); |
duke@435 | 676 | jweak ref = JNIHandles::make_weak_global(h); |
duke@435 | 677 | entry = tag_map()->create_entry(ref, obj_tag); |
duke@435 | 678 | hashmap->add(o, entry); |
duke@435 | 679 | } |
duke@435 | 680 | } else { |
duke@435 | 681 | // object was previously tagged - the callback may have untagged |
duke@435 | 682 | // the object or changed the tag value |
duke@435 | 683 | if (obj_tag == 0) { |
duke@435 | 684 | jweak ref = entry->object(); |
duke@435 | 685 | |
duke@435 | 686 | JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); |
duke@435 | 687 | assert(entry_removed == entry, "checking"); |
duke@435 | 688 | tag_map()->destroy_entry(entry); |
duke@435 | 689 | |
duke@435 | 690 | JNIHandles::destroy_weak_global(ref); |
duke@435 | 691 | } else { |
duke@435 | 692 | if (obj_tag != entry->tag()) { |
duke@435 | 693 | entry->set_tag(obj_tag); |
duke@435 | 694 | } |
duke@435 | 695 | } |
duke@435 | 696 | } |
duke@435 | 697 | } |
duke@435 | 698 | |
duke@435 | 699 | // An extended CallbackWrapper used when reporting an object reference |
duke@435 | 700 | // to the agent. |
duke@435 | 701 | // |
duke@435 | 702 | // { |
duke@435 | 703 | // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); |
duke@435 | 704 | // |
duke@435 | 705 | // (*callback)(wrapper.klass_tag(), |
duke@435 | 706 | // wrapper.obj_size(), |
duke@435 | 707 | // wrapper.obj_tag_p() |
duke@435 | 708 | // wrapper.referrer_tag_p(), ...) |
duke@435 | 709 | // |
duke@435 | 710 | // } // wrapper goes out of scope here which results in the destructor |
duke@435 | 711 | // checking to see if the referrer object has been tagged, untagged, |
duke@435 | 712 | // or the tag value has changed. |
duke@435 | 713 | // |
duke@435 | 714 | class TwoOopCallbackWrapper : public CallbackWrapper { |
duke@435 | 715 | private: |
duke@435 | 716 | bool _is_reference_to_self; |
duke@435 | 717 | JvmtiTagHashmap* _referrer_hashmap; |
duke@435 | 718 | JvmtiTagHashmapEntry* _referrer_entry; |
duke@435 | 719 | oop _referrer; |
duke@435 | 720 | jlong _referrer_obj_tag; |
duke@435 | 721 | jlong _referrer_klass_tag; |
duke@435 | 722 | jlong* _referrer_tag_p; |
duke@435 | 723 | |
duke@435 | 724 | bool is_reference_to_self() const { return _is_reference_to_self; } |
duke@435 | 725 | |
duke@435 | 726 | public: |
duke@435 | 727 | TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : |
duke@435 | 728 | CallbackWrapper(tag_map, o) |
duke@435 | 729 | { |
duke@435 | 730 | // self reference needs to be handled in a special way |
duke@435 | 731 | _is_reference_to_self = (referrer == o); |
duke@435 | 732 | |
duke@435 | 733 | if (_is_reference_to_self) { |
duke@435 | 734 | _referrer_klass_tag = klass_tag(); |
duke@435 | 735 | _referrer_tag_p = obj_tag_p(); |
duke@435 | 736 | } else { |
duke@435 | 737 | // for Classes the klassOop is tagged |
duke@435 | 738 | _referrer = klassOop_if_java_lang_Class(referrer); |
duke@435 | 739 | // record the context |
duke@435 | 740 | _referrer_hashmap = tag_map->hashmap_for(_referrer); |
duke@435 | 741 | _referrer_entry = _referrer_hashmap->find(_referrer); |
duke@435 | 742 | |
duke@435 | 743 | // get object tag |
duke@435 | 744 | _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); |
duke@435 | 745 | _referrer_tag_p = &_referrer_obj_tag; |
duke@435 | 746 | |
duke@435 | 747 | // get referrer class tag. |
duke@435 | 748 | klassOop k = (_referrer == referrer) ? // Check if referrer is a class... |
duke@435 | 749 | _referrer->klass() // No, just get its class |
duke@435 | 750 | : SystemDictionary::class_klass(); // Yes, its class is Class |
duke@435 | 751 | _referrer_klass_tag = tag_for(tag_map, k); |
duke@435 | 752 | } |
duke@435 | 753 | } |
duke@435 | 754 | |
duke@435 | 755 | ~TwoOopCallbackWrapper() { |
duke@435 | 756 | if (!is_reference_to_self()){ |
duke@435 | 757 | post_callback_tag_update(_referrer, |
duke@435 | 758 | _referrer_hashmap, |
duke@435 | 759 | _referrer_entry, |
duke@435 | 760 | _referrer_obj_tag); |
duke@435 | 761 | } |
duke@435 | 762 | } |
duke@435 | 763 | |
duke@435 | 764 | // address of referrer tag |
duke@435 | 765 | // (for a self reference this will return the same thing as obj_tag_p()) |
duke@435 | 766 | inline jlong* referrer_tag_p() { return _referrer_tag_p; } |
duke@435 | 767 | |
duke@435 | 768 | // referrer's class tag |
duke@435 | 769 | inline jlong referrer_klass_tag() { return _referrer_klass_tag; } |
duke@435 | 770 | }; |
duke@435 | 771 | |
duke@435 | 772 | // tag an object |
duke@435 | 773 | // |
duke@435 | 774 | // This function is performance critical. If many threads attempt to tag objects |
duke@435 | 775 | // around the same time then it's possible that the Mutex associated with the |
duke@435 | 776 | // tag map will be a hot lock. Eliminating this lock will not eliminate the issue |
duke@435 | 777 | // because creating a JNI weak reference requires acquiring a global lock also. |
duke@435 | 778 | void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
duke@435 | 779 | MutexLocker ml(lock()); |
duke@435 | 780 | |
duke@435 | 781 | // resolve the object |
duke@435 | 782 | oop o = JNIHandles::resolve_non_null(object); |
duke@435 | 783 | |
duke@435 | 784 | // for Classes we tag the klassOop |
duke@435 | 785 | o = klassOop_if_java_lang_Class(o); |
duke@435 | 786 | |
duke@435 | 787 | // see if the object is already tagged |
duke@435 | 788 | JvmtiTagHashmap* hashmap = hashmap_for(o); |
duke@435 | 789 | JvmtiTagHashmapEntry* entry = hashmap->find(o); |
duke@435 | 790 | |
duke@435 | 791 | // if the object is not already tagged then we tag it |
duke@435 | 792 | if (entry == NULL) { |
duke@435 | 793 | if (tag != 0) { |
duke@435 | 794 | HandleMark hm; |
duke@435 | 795 | Handle h(o); |
duke@435 | 796 | jweak ref = JNIHandles::make_weak_global(h); |
duke@435 | 797 | |
duke@435 | 798 | // the object may have moved because make_weak_global may |
duke@435 | 799 | // have blocked - thus it is necessary resolve the handle |
duke@435 | 800 | // and re-hash the object. |
duke@435 | 801 | o = h(); |
duke@435 | 802 | entry = create_entry(ref, tag); |
duke@435 | 803 | hashmap_for(o)->add(o, entry); |
duke@435 | 804 | } else { |
duke@435 | 805 | // no-op |
duke@435 | 806 | } |
duke@435 | 807 | } else { |
duke@435 | 808 | // if the object is already tagged then we either update |
duke@435 | 809 | // the tag (if a new tag value has been provided) |
duke@435 | 810 | // or remove the object if the new tag value is 0. |
duke@435 | 811 | // Removing the object requires that we also delete the JNI |
duke@435 | 812 | // weak ref to the object. |
duke@435 | 813 | if (tag == 0) { |
duke@435 | 814 | jweak ref = entry->object(); |
duke@435 | 815 | hashmap->remove(o); |
duke@435 | 816 | destroy_entry(entry); |
duke@435 | 817 | JNIHandles::destroy_weak_global(ref); |
duke@435 | 818 | } else { |
duke@435 | 819 | entry->set_tag(tag); |
duke@435 | 820 | } |
duke@435 | 821 | } |
duke@435 | 822 | } |
duke@435 | 823 | |
duke@435 | 824 | // get the tag for an object |
duke@435 | 825 | jlong JvmtiTagMap::get_tag(jobject object) { |
duke@435 | 826 | MutexLocker ml(lock()); |
duke@435 | 827 | |
duke@435 | 828 | // resolve the object |
duke@435 | 829 | oop o = JNIHandles::resolve_non_null(object); |
duke@435 | 830 | |
duke@435 | 831 | // for Classes get the tag from the klassOop |
duke@435 | 832 | return tag_for(this, klassOop_if_java_lang_Class(o)); |
duke@435 | 833 | } |
duke@435 | 834 | |
duke@435 | 835 | |
duke@435 | 836 | // Helper class used to describe the static or instance fields of a class. |
duke@435 | 837 | // For each field it holds the field index (as defined by the JVMTI specification), |
duke@435 | 838 | // the field type, and the offset. |
duke@435 | 839 | |
duke@435 | 840 | class ClassFieldDescriptor: public CHeapObj { |
duke@435 | 841 | private: |
duke@435 | 842 | int _field_index; |
duke@435 | 843 | int _field_offset; |
duke@435 | 844 | char _field_type; |
duke@435 | 845 | public: |
duke@435 | 846 | ClassFieldDescriptor(int index, char type, int offset) : |
duke@435 | 847 | _field_index(index), _field_type(type), _field_offset(offset) { |
duke@435 | 848 | } |
duke@435 | 849 | int field_index() const { return _field_index; } |
duke@435 | 850 | char field_type() const { return _field_type; } |
duke@435 | 851 | int field_offset() const { return _field_offset; } |
duke@435 | 852 | }; |
duke@435 | 853 | |
duke@435 | 854 | class ClassFieldMap: public CHeapObj { |
duke@435 | 855 | private: |
duke@435 | 856 | enum { |
duke@435 | 857 | initial_field_count = 5 |
duke@435 | 858 | }; |
duke@435 | 859 | |
duke@435 | 860 | // list of field descriptors |
duke@435 | 861 | GrowableArray<ClassFieldDescriptor*>* _fields; |
duke@435 | 862 | |
duke@435 | 863 | // constructor |
duke@435 | 864 | ClassFieldMap(); |
duke@435 | 865 | |
duke@435 | 866 | // add a field |
duke@435 | 867 | void add(int index, char type, int offset); |
duke@435 | 868 | |
duke@435 | 869 | // returns the field count for the given class |
duke@435 | 870 | static int compute_field_count(instanceKlassHandle ikh); |
duke@435 | 871 | |
duke@435 | 872 | public: |
duke@435 | 873 | ~ClassFieldMap(); |
duke@435 | 874 | |
duke@435 | 875 | // access |
duke@435 | 876 | int field_count() { return _fields->length(); } |
duke@435 | 877 | ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } |
duke@435 | 878 | |
duke@435 | 879 | // functions to create maps of static or instance fields |
duke@435 | 880 | static ClassFieldMap* create_map_of_static_fields(klassOop k); |
duke@435 | 881 | static ClassFieldMap* create_map_of_instance_fields(oop obj); |
duke@435 | 882 | }; |
duke@435 | 883 | |
duke@435 | 884 | ClassFieldMap::ClassFieldMap() { |
duke@435 | 885 | _fields = new (ResourceObj::C_HEAP) GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); |
duke@435 | 886 | } |
duke@435 | 887 | |
duke@435 | 888 | ClassFieldMap::~ClassFieldMap() { |
duke@435 | 889 | for (int i=0; i<_fields->length(); i++) { |
duke@435 | 890 | delete _fields->at(i); |
duke@435 | 891 | } |
duke@435 | 892 | delete _fields; |
duke@435 | 893 | } |
duke@435 | 894 | |
duke@435 | 895 | void ClassFieldMap::add(int index, char type, int offset) { |
duke@435 | 896 | ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); |
duke@435 | 897 | _fields->append(field); |
duke@435 | 898 | } |
duke@435 | 899 | |
duke@435 | 900 | // Returns a heap allocated ClassFieldMap to describe the static fields |
duke@435 | 901 | // of the given class. |
duke@435 | 902 | // |
duke@435 | 903 | ClassFieldMap* ClassFieldMap::create_map_of_static_fields(klassOop k) { |
duke@435 | 904 | HandleMark hm; |
duke@435 | 905 | instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); |
duke@435 | 906 | |
duke@435 | 907 | // create the field map |
duke@435 | 908 | ClassFieldMap* field_map = new ClassFieldMap(); |
duke@435 | 909 | |
duke@435 | 910 | FilteredFieldStream f(ikh, false, false); |
duke@435 | 911 | int max_field_index = f.field_count()-1; |
duke@435 | 912 | |
duke@435 | 913 | int index = 0; |
duke@435 | 914 | for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { |
duke@435 | 915 | // ignore instance fields |
duke@435 | 916 | if (!fld.access_flags().is_static()) { |
duke@435 | 917 | continue; |
duke@435 | 918 | } |
duke@435 | 919 | field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); |
duke@435 | 920 | } |
duke@435 | 921 | return field_map; |
duke@435 | 922 | } |
duke@435 | 923 | |
duke@435 | 924 | // Returns a heap allocated ClassFieldMap to describe the instance fields |
duke@435 | 925 | // of the given class. All instance fields are included (this means public |
duke@435 | 926 | // and private fields declared in superclasses and superinterfaces too). |
duke@435 | 927 | // |
duke@435 | 928 | ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { |
duke@435 | 929 | HandleMark hm; |
duke@435 | 930 | instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); |
duke@435 | 931 | |
duke@435 | 932 | // create the field map |
duke@435 | 933 | ClassFieldMap* field_map = new ClassFieldMap(); |
duke@435 | 934 | |
duke@435 | 935 | FilteredFieldStream f(ikh, false, false); |
duke@435 | 936 | |
duke@435 | 937 | int max_field_index = f.field_count()-1; |
duke@435 | 938 | |
duke@435 | 939 | int index = 0; |
duke@435 | 940 | for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { |
duke@435 | 941 | // ignore static fields |
duke@435 | 942 | if (fld.access_flags().is_static()) { |
duke@435 | 943 | continue; |
duke@435 | 944 | } |
duke@435 | 945 | field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); |
duke@435 | 946 | } |
duke@435 | 947 | |
duke@435 | 948 | return field_map; |
duke@435 | 949 | } |
duke@435 | 950 | |
duke@435 | 951 | // Helper class used to cache a ClassFileMap for the instance fields of |
duke@435 | 952 | // a cache. A JvmtiCachedClassFieldMap can be cached by an instanceKlass during |
duke@435 | 953 | // heap iteration and avoid creating a field map for each object in the heap |
duke@435 | 954 | // (only need to create the map when the first instance of a class is encountered). |
duke@435 | 955 | // |
duke@435 | 956 | class JvmtiCachedClassFieldMap : public CHeapObj { |
duke@435 | 957 | private: |
duke@435 | 958 | enum { |
duke@435 | 959 | initial_class_count = 200 |
duke@435 | 960 | }; |
duke@435 | 961 | ClassFieldMap* _field_map; |
duke@435 | 962 | |
duke@435 | 963 | ClassFieldMap* field_map() const { return _field_map; } |
duke@435 | 964 | |
duke@435 | 965 | JvmtiCachedClassFieldMap(ClassFieldMap* field_map); |
duke@435 | 966 | ~JvmtiCachedClassFieldMap(); |
duke@435 | 967 | |
duke@435 | 968 | static GrowableArray<instanceKlass*>* _class_list; |
duke@435 | 969 | static void add_to_class_list(instanceKlass* ik); |
duke@435 | 970 | |
duke@435 | 971 | public: |
duke@435 | 972 | // returns the field map for a given object (returning map cached |
duke@435 | 973 | // by instanceKlass if possible |
duke@435 | 974 | static ClassFieldMap* get_map_of_instance_fields(oop obj); |
duke@435 | 975 | |
duke@435 | 976 | // removes the field map from all instanceKlasses - should be |
duke@435 | 977 | // called before VM operation completes |
duke@435 | 978 | static void clear_cache(); |
duke@435 | 979 | |
duke@435 | 980 | // returns the number of ClassFieldMap cached by instanceKlasses |
duke@435 | 981 | static int cached_field_map_count(); |
duke@435 | 982 | }; |
duke@435 | 983 | |
duke@435 | 984 | GrowableArray<instanceKlass*>* JvmtiCachedClassFieldMap::_class_list; |
duke@435 | 985 | |
duke@435 | 986 | JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { |
duke@435 | 987 | _field_map = field_map; |
duke@435 | 988 | } |
duke@435 | 989 | |
duke@435 | 990 | JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { |
duke@435 | 991 | if (_field_map != NULL) { |
duke@435 | 992 | delete _field_map; |
duke@435 | 993 | } |
duke@435 | 994 | } |
duke@435 | 995 | |
duke@435 | 996 | // Marker class to ensure that the class file map cache is only used in a defined |
duke@435 | 997 | // scope. |
duke@435 | 998 | class ClassFieldMapCacheMark : public StackObj { |
duke@435 | 999 | private: |
duke@435 | 1000 | static bool _is_active; |
duke@435 | 1001 | public: |
duke@435 | 1002 | ClassFieldMapCacheMark() { |
duke@435 | 1003 | assert(Thread::current()->is_VM_thread(), "must be VMThread"); |
duke@435 | 1004 | assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); |
duke@435 | 1005 | assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); |
duke@435 | 1006 | _is_active = true; |
duke@435 | 1007 | } |
duke@435 | 1008 | ~ClassFieldMapCacheMark() { |
duke@435 | 1009 | JvmtiCachedClassFieldMap::clear_cache(); |
duke@435 | 1010 | _is_active = false; |
duke@435 | 1011 | } |
duke@435 | 1012 | static bool is_active() { return _is_active; } |
duke@435 | 1013 | }; |
duke@435 | 1014 | |
duke@435 | 1015 | bool ClassFieldMapCacheMark::_is_active; |
duke@435 | 1016 | |
duke@435 | 1017 | |
duke@435 | 1018 | // record that the given instanceKlass is caching a field map |
duke@435 | 1019 | void JvmtiCachedClassFieldMap::add_to_class_list(instanceKlass* ik) { |
duke@435 | 1020 | if (_class_list == NULL) { |
duke@435 | 1021 | _class_list = new (ResourceObj::C_HEAP) GrowableArray<instanceKlass*>(initial_class_count, true); |
duke@435 | 1022 | } |
duke@435 | 1023 | _class_list->push(ik); |
duke@435 | 1024 | } |
duke@435 | 1025 | |
duke@435 | 1026 | // returns the instance field map for the given object |
duke@435 | 1027 | // (returns field map cached by the instanceKlass if possible) |
duke@435 | 1028 | ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { |
duke@435 | 1029 | assert(Thread::current()->is_VM_thread(), "must be VMThread"); |
duke@435 | 1030 | assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); |
duke@435 | 1031 | |
duke@435 | 1032 | klassOop k = obj->klass(); |
duke@435 | 1033 | instanceKlass* ik = instanceKlass::cast(k); |
duke@435 | 1034 | |
duke@435 | 1035 | // return cached map if possible |
duke@435 | 1036 | JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); |
duke@435 | 1037 | if (cached_map != NULL) { |
duke@435 | 1038 | assert(cached_map->field_map() != NULL, "missing field list"); |
duke@435 | 1039 | return cached_map->field_map(); |
duke@435 | 1040 | } else { |
duke@435 | 1041 | ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); |
duke@435 | 1042 | cached_map = new JvmtiCachedClassFieldMap(field_map); |
duke@435 | 1043 | ik->set_jvmti_cached_class_field_map(cached_map); |
duke@435 | 1044 | add_to_class_list(ik); |
duke@435 | 1045 | return field_map; |
duke@435 | 1046 | } |
duke@435 | 1047 | } |
duke@435 | 1048 | |
duke@435 | 1049 | // remove the fields maps cached from all instanceKlasses |
duke@435 | 1050 | void JvmtiCachedClassFieldMap::clear_cache() { |
duke@435 | 1051 | assert(Thread::current()->is_VM_thread(), "must be VMThread"); |
duke@435 | 1052 | if (_class_list != NULL) { |
duke@435 | 1053 | for (int i = 0; i < _class_list->length(); i++) { |
duke@435 | 1054 | instanceKlass* ik = _class_list->at(i); |
duke@435 | 1055 | JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); |
duke@435 | 1056 | assert(cached_map != NULL, "should not be NULL"); |
duke@435 | 1057 | ik->set_jvmti_cached_class_field_map(NULL); |
duke@435 | 1058 | delete cached_map; // deletes the encapsulated field map |
duke@435 | 1059 | } |
duke@435 | 1060 | delete _class_list; |
duke@435 | 1061 | _class_list = NULL; |
duke@435 | 1062 | } |
duke@435 | 1063 | } |
duke@435 | 1064 | |
duke@435 | 1065 | // returns the number of ClassFieldMap cached by instanceKlasses |
duke@435 | 1066 | int JvmtiCachedClassFieldMap::cached_field_map_count() { |
duke@435 | 1067 | return (_class_list == NULL) ? 0 : _class_list->length(); |
duke@435 | 1068 | } |
duke@435 | 1069 | |
duke@435 | 1070 | // helper function to indicate if an object is filtered by its tag or class tag |
duke@435 | 1071 | static inline bool is_filtered_by_heap_filter(jlong obj_tag, |
duke@435 | 1072 | jlong klass_tag, |
duke@435 | 1073 | int heap_filter) { |
duke@435 | 1074 | // apply the heap filter |
duke@435 | 1075 | if (obj_tag != 0) { |
duke@435 | 1076 | // filter out tagged objects |
duke@435 | 1077 | if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; |
duke@435 | 1078 | } else { |
duke@435 | 1079 | // filter out untagged objects |
duke@435 | 1080 | if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; |
duke@435 | 1081 | } |
duke@435 | 1082 | if (klass_tag != 0) { |
duke@435 | 1083 | // filter out objects with tagged classes |
duke@435 | 1084 | if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; |
duke@435 | 1085 | } else { |
duke@435 | 1086 | // filter out objects with untagged classes. |
duke@435 | 1087 | if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; |
duke@435 | 1088 | } |
duke@435 | 1089 | return false; |
duke@435 | 1090 | } |
duke@435 | 1091 | |
duke@435 | 1092 | // helper function to indicate if an object is filtered by a klass filter |
duke@435 | 1093 | static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { |
duke@435 | 1094 | if (!klass_filter.is_null()) { |
duke@435 | 1095 | if (obj->klass() != klass_filter()) { |
duke@435 | 1096 | return true; |
duke@435 | 1097 | } |
duke@435 | 1098 | } |
duke@435 | 1099 | return false; |
duke@435 | 1100 | } |
duke@435 | 1101 | |
duke@435 | 1102 | // helper function to tell if a field is a primitive field or not |
duke@435 | 1103 | static inline bool is_primitive_field_type(char type) { |
duke@435 | 1104 | return (type != 'L' && type != '['); |
duke@435 | 1105 | } |
duke@435 | 1106 | |
duke@435 | 1107 | // helper function to copy the value from location addr to jvalue. |
duke@435 | 1108 | static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { |
duke@435 | 1109 | switch (value_type) { |
duke@435 | 1110 | case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } |
duke@435 | 1111 | case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } |
duke@435 | 1112 | case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } |
duke@435 | 1113 | case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } |
duke@435 | 1114 | case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } |
duke@435 | 1115 | case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } |
duke@435 | 1116 | case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } |
duke@435 | 1117 | case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } |
duke@435 | 1118 | default: ShouldNotReachHere(); |
duke@435 | 1119 | } |
duke@435 | 1120 | } |
duke@435 | 1121 | |
duke@435 | 1122 | // helper function to invoke string primitive value callback |
duke@435 | 1123 | // returns visit control flags |
duke@435 | 1124 | static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, |
duke@435 | 1125 | CallbackWrapper* wrapper, |
duke@435 | 1126 | oop str, |
duke@435 | 1127 | void* user_data) |
duke@435 | 1128 | { |
duke@435 | 1129 | assert(str->klass() == SystemDictionary::string_klass(), "not a string"); |
duke@435 | 1130 | |
duke@435 | 1131 | // get the string value and length |
duke@435 | 1132 | // (string value may be offset from the base) |
duke@435 | 1133 | int s_len = java_lang_String::length(str); |
duke@435 | 1134 | typeArrayOop s_value = java_lang_String::value(str); |
duke@435 | 1135 | int s_offset = java_lang_String::offset(str); |
duke@435 | 1136 | jchar* value; |
duke@435 | 1137 | if (s_len > 0) { |
duke@435 | 1138 | value = s_value->char_at_addr(s_offset); |
duke@435 | 1139 | } else { |
duke@435 | 1140 | value = (jchar*) s_value->base(T_CHAR); |
duke@435 | 1141 | } |
duke@435 | 1142 | |
duke@435 | 1143 | // invoke the callback |
duke@435 | 1144 | return (*cb)(wrapper->klass_tag(), |
duke@435 | 1145 | wrapper->obj_size(), |
duke@435 | 1146 | wrapper->obj_tag_p(), |
duke@435 | 1147 | value, |
duke@435 | 1148 | (jint)s_len, |
duke@435 | 1149 | user_data); |
duke@435 | 1150 | } |
duke@435 | 1151 | |
duke@435 | 1152 | // helper function to invoke string primitive value callback |
duke@435 | 1153 | // returns visit control flags |
duke@435 | 1154 | static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, |
duke@435 | 1155 | CallbackWrapper* wrapper, |
duke@435 | 1156 | oop obj, |
duke@435 | 1157 | void* user_data) |
duke@435 | 1158 | { |
duke@435 | 1159 | assert(obj->is_typeArray(), "not a primitive array"); |
duke@435 | 1160 | |
duke@435 | 1161 | // get base address of first element |
duke@435 | 1162 | typeArrayOop array = typeArrayOop(obj); |
duke@435 | 1163 | BasicType type = typeArrayKlass::cast(array->klass())->element_type(); |
duke@435 | 1164 | void* elements = array->base(type); |
duke@435 | 1165 | |
duke@435 | 1166 | // jvmtiPrimitiveType is defined so this mapping is always correct |
duke@435 | 1167 | jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); |
duke@435 | 1168 | |
duke@435 | 1169 | return (*cb)(wrapper->klass_tag(), |
duke@435 | 1170 | wrapper->obj_size(), |
duke@435 | 1171 | wrapper->obj_tag_p(), |
duke@435 | 1172 | (jint)array->length(), |
duke@435 | 1173 | elem_type, |
duke@435 | 1174 | elements, |
duke@435 | 1175 | user_data); |
duke@435 | 1176 | } |
duke@435 | 1177 | |
duke@435 | 1178 | // helper function to invoke the primitive field callback for all static fields |
duke@435 | 1179 | // of a given class |
duke@435 | 1180 | static jint invoke_primitive_field_callback_for_static_fields |
duke@435 | 1181 | (CallbackWrapper* wrapper, |
duke@435 | 1182 | oop obj, |
duke@435 | 1183 | jvmtiPrimitiveFieldCallback cb, |
duke@435 | 1184 | void* user_data) |
duke@435 | 1185 | { |
duke@435 | 1186 | // for static fields only the index will be set |
duke@435 | 1187 | static jvmtiHeapReferenceInfo reference_info = { 0 }; |
duke@435 | 1188 | |
duke@435 | 1189 | assert(obj->klass() == SystemDictionary::class_klass(), "not a class"); |
duke@435 | 1190 | if (java_lang_Class::is_primitive(obj)) { |
duke@435 | 1191 | return 0; |
duke@435 | 1192 | } |
duke@435 | 1193 | klassOop k = java_lang_Class::as_klassOop(obj); |
duke@435 | 1194 | Klass* klass = k->klass_part(); |
duke@435 | 1195 | |
duke@435 | 1196 | // ignore classes for object and type arrays |
duke@435 | 1197 | if (!klass->oop_is_instance()) { |
duke@435 | 1198 | return 0; |
duke@435 | 1199 | } |
duke@435 | 1200 | |
duke@435 | 1201 | // ignore classes which aren't linked yet |
duke@435 | 1202 | instanceKlass* ik = instanceKlass::cast(k); |
duke@435 | 1203 | if (!ik->is_linked()) { |
duke@435 | 1204 | return 0; |
duke@435 | 1205 | } |
duke@435 | 1206 | |
duke@435 | 1207 | // get the field map |
duke@435 | 1208 | ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); |
duke@435 | 1209 | |
duke@435 | 1210 | // invoke the callback for each static primitive field |
duke@435 | 1211 | for (int i=0; i<field_map->field_count(); i++) { |
duke@435 | 1212 | ClassFieldDescriptor* field = field_map->field_at(i); |
duke@435 | 1213 | |
duke@435 | 1214 | // ignore non-primitive fields |
duke@435 | 1215 | char type = field->field_type(); |
duke@435 | 1216 | if (!is_primitive_field_type(type)) { |
duke@435 | 1217 | continue; |
duke@435 | 1218 | } |
duke@435 | 1219 | // one-to-one mapping |
duke@435 | 1220 | jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; |
duke@435 | 1221 | |
duke@435 | 1222 | // get offset and field value |
duke@435 | 1223 | int offset = field->field_offset(); |
duke@435 | 1224 | address addr = (address)k + offset; |
duke@435 | 1225 | jvalue value; |
duke@435 | 1226 | copy_to_jvalue(&value, addr, value_type); |
duke@435 | 1227 | |
duke@435 | 1228 | // field index |
duke@435 | 1229 | reference_info.field.index = field->field_index(); |
duke@435 | 1230 | |
duke@435 | 1231 | // invoke the callback |
duke@435 | 1232 | jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, |
duke@435 | 1233 | &reference_info, |
duke@435 | 1234 | wrapper->klass_tag(), |
duke@435 | 1235 | wrapper->obj_tag_p(), |
duke@435 | 1236 | value, |
duke@435 | 1237 | value_type, |
duke@435 | 1238 | user_data); |
duke@435 | 1239 | if (res & JVMTI_VISIT_ABORT) { |
duke@435 | 1240 | delete field_map; |
duke@435 | 1241 | return res; |
duke@435 | 1242 | } |
duke@435 | 1243 | } |
duke@435 | 1244 | |
duke@435 | 1245 | delete field_map; |
duke@435 | 1246 | return 0; |
duke@435 | 1247 | } |
duke@435 | 1248 | |
duke@435 | 1249 | // helper function to invoke the primitive field callback for all instance fields |
duke@435 | 1250 | // of a given object |
duke@435 | 1251 | static jint invoke_primitive_field_callback_for_instance_fields( |
duke@435 | 1252 | CallbackWrapper* wrapper, |
duke@435 | 1253 | oop obj, |
duke@435 | 1254 | jvmtiPrimitiveFieldCallback cb, |
duke@435 | 1255 | void* user_data) |
duke@435 | 1256 | { |
duke@435 | 1257 | // for instance fields only the index will be set |
duke@435 | 1258 | static jvmtiHeapReferenceInfo reference_info = { 0 }; |
duke@435 | 1259 | |
duke@435 | 1260 | // get the map of the instance fields |
duke@435 | 1261 | ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); |
duke@435 | 1262 | |
duke@435 | 1263 | // invoke the callback for each instance primitive field |
duke@435 | 1264 | for (int i=0; i<fields->field_count(); i++) { |
duke@435 | 1265 | ClassFieldDescriptor* field = fields->field_at(i); |
duke@435 | 1266 | |
duke@435 | 1267 | // ignore non-primitive fields |
duke@435 | 1268 | char type = field->field_type(); |
duke@435 | 1269 | if (!is_primitive_field_type(type)) { |
duke@435 | 1270 | continue; |
duke@435 | 1271 | } |
duke@435 | 1272 | // one-to-one mapping |
duke@435 | 1273 | jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; |
duke@435 | 1274 | |
duke@435 | 1275 | // get offset and field value |
duke@435 | 1276 | int offset = field->field_offset(); |
duke@435 | 1277 | address addr = (address)obj + offset; |
duke@435 | 1278 | jvalue value; |
duke@435 | 1279 | copy_to_jvalue(&value, addr, value_type); |
duke@435 | 1280 | |
duke@435 | 1281 | // field index |
duke@435 | 1282 | reference_info.field.index = field->field_index(); |
duke@435 | 1283 | |
duke@435 | 1284 | // invoke the callback |
duke@435 | 1285 | jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, |
duke@435 | 1286 | &reference_info, |
duke@435 | 1287 | wrapper->klass_tag(), |
duke@435 | 1288 | wrapper->obj_tag_p(), |
duke@435 | 1289 | value, |
duke@435 | 1290 | value_type, |
duke@435 | 1291 | user_data); |
duke@435 | 1292 | if (res & JVMTI_VISIT_ABORT) { |
duke@435 | 1293 | return res; |
duke@435 | 1294 | } |
duke@435 | 1295 | } |
duke@435 | 1296 | return 0; |
duke@435 | 1297 | } |
duke@435 | 1298 | |
duke@435 | 1299 | |
duke@435 | 1300 | // VM operation to iterate over all objects in the heap (both reachable |
duke@435 | 1301 | // and unreachable) |
duke@435 | 1302 | class VM_HeapIterateOperation: public VM_Operation { |
duke@435 | 1303 | private: |
duke@435 | 1304 | ObjectClosure* _blk; |
duke@435 | 1305 | public: |
duke@435 | 1306 | VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } |
duke@435 | 1307 | |
duke@435 | 1308 | VMOp_Type type() const { return VMOp_HeapIterateOperation; } |
duke@435 | 1309 | void doit() { |
duke@435 | 1310 | // allows class files maps to be cached during iteration |
duke@435 | 1311 | ClassFieldMapCacheMark cm; |
duke@435 | 1312 | |
duke@435 | 1313 | // make sure that heap is parsable (fills TLABs with filler objects) |
duke@435 | 1314 | Universe::heap()->ensure_parsability(false); // no need to retire TLABs |
duke@435 | 1315 | |
duke@435 | 1316 | // Verify heap before iteration - if the heap gets corrupted then |
duke@435 | 1317 | // JVMTI's IterateOverHeap will crash. |
duke@435 | 1318 | if (VerifyBeforeIteration) { |
duke@435 | 1319 | Universe::verify(); |
duke@435 | 1320 | } |
duke@435 | 1321 | |
duke@435 | 1322 | // do the iteration |
jmasa@952 | 1323 | // If this operation encounters a bad object when using CMS, |
jmasa@952 | 1324 | // consider using safe_object_iterate() which avoids perm gen |
jmasa@952 | 1325 | // objects that may contain bad references. |
duke@435 | 1326 | Universe::heap()->object_iterate(_blk); |
duke@435 | 1327 | |
duke@435 | 1328 | // when sharing is enabled we must iterate over the shared spaces |
duke@435 | 1329 | if (UseSharedSpaces) { |
duke@435 | 1330 | GenCollectedHeap* gch = GenCollectedHeap::heap(); |
duke@435 | 1331 | CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); |
duke@435 | 1332 | gen->ro_space()->object_iterate(_blk); |
duke@435 | 1333 | gen->rw_space()->object_iterate(_blk); |
duke@435 | 1334 | } |
duke@435 | 1335 | } |
duke@435 | 1336 | |
duke@435 | 1337 | }; |
duke@435 | 1338 | |
duke@435 | 1339 | |
duke@435 | 1340 | // An ObjectClosure used to support the deprecated IterateOverHeap and |
duke@435 | 1341 | // IterateOverInstancesOfClass functions |
duke@435 | 1342 | class IterateOverHeapObjectClosure: public ObjectClosure { |
duke@435 | 1343 | private: |
duke@435 | 1344 | JvmtiTagMap* _tag_map; |
duke@435 | 1345 | KlassHandle _klass; |
duke@435 | 1346 | jvmtiHeapObjectFilter _object_filter; |
duke@435 | 1347 | jvmtiHeapObjectCallback _heap_object_callback; |
duke@435 | 1348 | const void* _user_data; |
duke@435 | 1349 | |
duke@435 | 1350 | // accessors |
duke@435 | 1351 | JvmtiTagMap* tag_map() const { return _tag_map; } |
duke@435 | 1352 | jvmtiHeapObjectFilter object_filter() const { return _object_filter; } |
duke@435 | 1353 | jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } |
duke@435 | 1354 | KlassHandle klass() const { return _klass; } |
duke@435 | 1355 | const void* user_data() const { return _user_data; } |
duke@435 | 1356 | |
duke@435 | 1357 | // indicates if iteration has been aborted |
duke@435 | 1358 | bool _iteration_aborted; |
duke@435 | 1359 | bool is_iteration_aborted() const { return _iteration_aborted; } |
duke@435 | 1360 | void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } |
duke@435 | 1361 | |
duke@435 | 1362 | public: |
duke@435 | 1363 | IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, |
duke@435 | 1364 | KlassHandle klass, |
duke@435 | 1365 | jvmtiHeapObjectFilter object_filter, |
duke@435 | 1366 | jvmtiHeapObjectCallback heap_object_callback, |
duke@435 | 1367 | const void* user_data) : |
duke@435 | 1368 | _tag_map(tag_map), |
duke@435 | 1369 | _klass(klass), |
duke@435 | 1370 | _object_filter(object_filter), |
duke@435 | 1371 | _heap_object_callback(heap_object_callback), |
duke@435 | 1372 | _user_data(user_data), |
duke@435 | 1373 | _iteration_aborted(false) |
duke@435 | 1374 | { |
duke@435 | 1375 | } |
duke@435 | 1376 | |
duke@435 | 1377 | void do_object(oop o); |
duke@435 | 1378 | }; |
duke@435 | 1379 | |
duke@435 | 1380 | // invoked for each object in the heap |
duke@435 | 1381 | void IterateOverHeapObjectClosure::do_object(oop o) { |
duke@435 | 1382 | // check if iteration has been halted |
duke@435 | 1383 | if (is_iteration_aborted()) return; |
duke@435 | 1384 | |
duke@435 | 1385 | // ignore any objects that aren't visible to profiler |
duke@435 | 1386 | if (!ServiceUtil::visible_oop(o)) return; |
duke@435 | 1387 | |
duke@435 | 1388 | // instanceof check when filtering by klass |
duke@435 | 1389 | if (!klass().is_null() && !o->is_a(klass()())) { |
duke@435 | 1390 | return; |
duke@435 | 1391 | } |
duke@435 | 1392 | // prepare for the calllback |
duke@435 | 1393 | CallbackWrapper wrapper(tag_map(), o); |
duke@435 | 1394 | |
duke@435 | 1395 | // if the object is tagged and we're only interested in untagged objects |
duke@435 | 1396 | // then don't invoke the callback. Similiarly, if the object is untagged |
duke@435 | 1397 | // and we're only interested in tagged objects we skip the callback. |
duke@435 | 1398 | if (wrapper.obj_tag() != 0) { |
duke@435 | 1399 | if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; |
duke@435 | 1400 | } else { |
duke@435 | 1401 | if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; |
duke@435 | 1402 | } |
duke@435 | 1403 | |
duke@435 | 1404 | // invoke the agent's callback |
duke@435 | 1405 | jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), |
duke@435 | 1406 | wrapper.obj_size(), |
duke@435 | 1407 | wrapper.obj_tag_p(), |
duke@435 | 1408 | (void*)user_data()); |
duke@435 | 1409 | if (control == JVMTI_ITERATION_ABORT) { |
duke@435 | 1410 | set_iteration_aborted(true); |
duke@435 | 1411 | } |
duke@435 | 1412 | } |
duke@435 | 1413 | |
duke@435 | 1414 | // An ObjectClosure used to support the IterateThroughHeap function |
duke@435 | 1415 | class IterateThroughHeapObjectClosure: public ObjectClosure { |
duke@435 | 1416 | private: |
duke@435 | 1417 | JvmtiTagMap* _tag_map; |
duke@435 | 1418 | KlassHandle _klass; |
duke@435 | 1419 | int _heap_filter; |
duke@435 | 1420 | const jvmtiHeapCallbacks* _callbacks; |
duke@435 | 1421 | const void* _user_data; |
duke@435 | 1422 | |
duke@435 | 1423 | // accessor functions |
duke@435 | 1424 | JvmtiTagMap* tag_map() const { return _tag_map; } |
duke@435 | 1425 | int heap_filter() const { return _heap_filter; } |
duke@435 | 1426 | const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } |
duke@435 | 1427 | KlassHandle klass() const { return _klass; } |
duke@435 | 1428 | const void* user_data() const { return _user_data; } |
duke@435 | 1429 | |
duke@435 | 1430 | // indicates if the iteration has been aborted |
duke@435 | 1431 | bool _iteration_aborted; |
duke@435 | 1432 | bool is_iteration_aborted() const { return _iteration_aborted; } |
duke@435 | 1433 | |
duke@435 | 1434 | // used to check the visit control flags. If the abort flag is set |
duke@435 | 1435 | // then we set the iteration aborted flag so that the iteration completes |
duke@435 | 1436 | // without processing any further objects |
duke@435 | 1437 | bool check_flags_for_abort(jint flags) { |
duke@435 | 1438 | bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; |
duke@435 | 1439 | if (is_abort) { |
duke@435 | 1440 | _iteration_aborted = true; |
duke@435 | 1441 | } |
duke@435 | 1442 | return is_abort; |
duke@435 | 1443 | } |
duke@435 | 1444 | |
duke@435 | 1445 | public: |
duke@435 | 1446 | IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, |
duke@435 | 1447 | KlassHandle klass, |
duke@435 | 1448 | int heap_filter, |
duke@435 | 1449 | const jvmtiHeapCallbacks* heap_callbacks, |
duke@435 | 1450 | const void* user_data) : |
duke@435 | 1451 | _tag_map(tag_map), |
duke@435 | 1452 | _klass(klass), |
duke@435 | 1453 | _heap_filter(heap_filter), |
duke@435 | 1454 | _callbacks(heap_callbacks), |
duke@435 | 1455 | _user_data(user_data), |
duke@435 | 1456 | _iteration_aborted(false) |
duke@435 | 1457 | { |
duke@435 | 1458 | } |
duke@435 | 1459 | |
duke@435 | 1460 | void do_object(oop o); |
duke@435 | 1461 | }; |
duke@435 | 1462 | |
duke@435 | 1463 | // invoked for each object in the heap |
duke@435 | 1464 | void IterateThroughHeapObjectClosure::do_object(oop obj) { |
duke@435 | 1465 | // check if iteration has been halted |
duke@435 | 1466 | if (is_iteration_aborted()) return; |
duke@435 | 1467 | |
duke@435 | 1468 | // ignore any objects that aren't visible to profiler |
duke@435 | 1469 | if (!ServiceUtil::visible_oop(obj)) return; |
duke@435 | 1470 | |
duke@435 | 1471 | // apply class filter |
duke@435 | 1472 | if (is_filtered_by_klass_filter(obj, klass())) return; |
duke@435 | 1473 | |
duke@435 | 1474 | // prepare for callback |
duke@435 | 1475 | CallbackWrapper wrapper(tag_map(), obj); |
duke@435 | 1476 | |
duke@435 | 1477 | // check if filtered by the heap filter |
duke@435 | 1478 | if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { |
duke@435 | 1479 | return; |
duke@435 | 1480 | } |
duke@435 | 1481 | |
duke@435 | 1482 | // for arrays we need the length, otherwise -1 |
duke@435 | 1483 | bool is_array = obj->is_array(); |
duke@435 | 1484 | int len = is_array ? arrayOop(obj)->length() : -1; |
duke@435 | 1485 | |
duke@435 | 1486 | // invoke the object callback (if callback is provided) |
duke@435 | 1487 | if (callbacks()->heap_iteration_callback != NULL) { |
duke@435 | 1488 | jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; |
duke@435 | 1489 | jint res = (*cb)(wrapper.klass_tag(), |
duke@435 | 1490 | wrapper.obj_size(), |
duke@435 | 1491 | wrapper.obj_tag_p(), |
duke@435 | 1492 | (jint)len, |
duke@435 | 1493 | (void*)user_data()); |
duke@435 | 1494 | if (check_flags_for_abort(res)) return; |
duke@435 | 1495 | } |
duke@435 | 1496 | |
duke@435 | 1497 | // for objects and classes we report primitive fields if callback provided |
duke@435 | 1498 | if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { |
duke@435 | 1499 | jint res; |
duke@435 | 1500 | jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; |
duke@435 | 1501 | if (obj->klass() == SystemDictionary::class_klass()) { |
duke@435 | 1502 | res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
duke@435 | 1503 | obj, |
duke@435 | 1504 | cb, |
duke@435 | 1505 | (void*)user_data()); |
duke@435 | 1506 | } else { |
duke@435 | 1507 | res = invoke_primitive_field_callback_for_instance_fields(&wrapper, |
duke@435 | 1508 | obj, |
duke@435 | 1509 | cb, |
duke@435 | 1510 | (void*)user_data()); |
duke@435 | 1511 | } |
duke@435 | 1512 | if (check_flags_for_abort(res)) return; |
duke@435 | 1513 | } |
duke@435 | 1514 | |
duke@435 | 1515 | // string callback |
duke@435 | 1516 | if (!is_array && |
duke@435 | 1517 | callbacks()->string_primitive_value_callback != NULL && |
duke@435 | 1518 | obj->klass() == SystemDictionary::string_klass()) { |
duke@435 | 1519 | jint res = invoke_string_value_callback( |
duke@435 | 1520 | callbacks()->string_primitive_value_callback, |
duke@435 | 1521 | &wrapper, |
duke@435 | 1522 | obj, |
duke@435 | 1523 | (void*)user_data() ); |
duke@435 | 1524 | if (check_flags_for_abort(res)) return; |
duke@435 | 1525 | } |
duke@435 | 1526 | |
duke@435 | 1527 | // array callback |
duke@435 | 1528 | if (is_array && |
duke@435 | 1529 | callbacks()->array_primitive_value_callback != NULL && |
duke@435 | 1530 | obj->is_typeArray()) { |
duke@435 | 1531 | jint res = invoke_array_primitive_value_callback( |
duke@435 | 1532 | callbacks()->array_primitive_value_callback, |
duke@435 | 1533 | &wrapper, |
duke@435 | 1534 | obj, |
duke@435 | 1535 | (void*)user_data() ); |
duke@435 | 1536 | if (check_flags_for_abort(res)) return; |
duke@435 | 1537 | } |
duke@435 | 1538 | }; |
duke@435 | 1539 | |
duke@435 | 1540 | |
duke@435 | 1541 | // Deprecated function to iterate over all objects in the heap |
duke@435 | 1542 | void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, |
duke@435 | 1543 | KlassHandle klass, |
duke@435 | 1544 | jvmtiHeapObjectCallback heap_object_callback, |
duke@435 | 1545 | const void* user_data) |
duke@435 | 1546 | { |
duke@435 | 1547 | MutexLocker ml(Heap_lock); |
duke@435 | 1548 | IterateOverHeapObjectClosure blk(this, |
duke@435 | 1549 | klass, |
duke@435 | 1550 | object_filter, |
duke@435 | 1551 | heap_object_callback, |
duke@435 | 1552 | user_data); |
duke@435 | 1553 | VM_HeapIterateOperation op(&blk); |
duke@435 | 1554 | VMThread::execute(&op); |
duke@435 | 1555 | } |
duke@435 | 1556 | |
duke@435 | 1557 | |
duke@435 | 1558 | // Iterates over all objects in the heap |
duke@435 | 1559 | void JvmtiTagMap::iterate_through_heap(jint heap_filter, |
duke@435 | 1560 | KlassHandle klass, |
duke@435 | 1561 | const jvmtiHeapCallbacks* callbacks, |
duke@435 | 1562 | const void* user_data) |
duke@435 | 1563 | { |
duke@435 | 1564 | MutexLocker ml(Heap_lock); |
duke@435 | 1565 | IterateThroughHeapObjectClosure blk(this, |
duke@435 | 1566 | klass, |
duke@435 | 1567 | heap_filter, |
duke@435 | 1568 | callbacks, |
duke@435 | 1569 | user_data); |
duke@435 | 1570 | VM_HeapIterateOperation op(&blk); |
duke@435 | 1571 | VMThread::execute(&op); |
duke@435 | 1572 | } |
duke@435 | 1573 | |
duke@435 | 1574 | // support class for get_objects_with_tags |
duke@435 | 1575 | |
duke@435 | 1576 | class TagObjectCollector : public JvmtiTagHashmapEntryClosure { |
duke@435 | 1577 | private: |
duke@435 | 1578 | JvmtiEnv* _env; |
duke@435 | 1579 | jlong* _tags; |
duke@435 | 1580 | jint _tag_count; |
duke@435 | 1581 | |
duke@435 | 1582 | GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) |
duke@435 | 1583 | GrowableArray<uint64_t>* _tag_results; // collected tags |
duke@435 | 1584 | |
duke@435 | 1585 | public: |
duke@435 | 1586 | TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { |
duke@435 | 1587 | _env = env; |
duke@435 | 1588 | _tags = (jlong*)tags; |
duke@435 | 1589 | _tag_count = tag_count; |
duke@435 | 1590 | _object_results = new (ResourceObj::C_HEAP) GrowableArray<jobject>(1,true); |
duke@435 | 1591 | _tag_results = new (ResourceObj::C_HEAP) GrowableArray<uint64_t>(1,true); |
duke@435 | 1592 | } |
duke@435 | 1593 | |
duke@435 | 1594 | ~TagObjectCollector() { |
duke@435 | 1595 | delete _object_results; |
duke@435 | 1596 | delete _tag_results; |
duke@435 | 1597 | } |
duke@435 | 1598 | |
duke@435 | 1599 | // for each tagged object check if the tag value matches |
duke@435 | 1600 | // - if it matches then we create a JNI local reference to the object |
duke@435 | 1601 | // and record the reference and tag value. |
duke@435 | 1602 | // |
duke@435 | 1603 | void do_entry(JvmtiTagHashmapEntry* entry) { |
duke@435 | 1604 | for (int i=0; i<_tag_count; i++) { |
duke@435 | 1605 | if (_tags[i] == entry->tag()) { |
duke@435 | 1606 | oop o = JNIHandles::resolve(entry->object()); |
duke@435 | 1607 | assert(o != NULL && o != JNIHandles::deleted_handle(), "sanity check"); |
duke@435 | 1608 | |
duke@435 | 1609 | // the mirror is tagged |
duke@435 | 1610 | if (o->is_klass()) { |
duke@435 | 1611 | klassOop k = (klassOop)o; |
duke@435 | 1612 | o = Klass::cast(k)->java_mirror(); |
duke@435 | 1613 | } |
duke@435 | 1614 | |
duke@435 | 1615 | jobject ref = JNIHandles::make_local(JavaThread::current(), o); |
duke@435 | 1616 | _object_results->append(ref); |
duke@435 | 1617 | _tag_results->append((uint64_t)entry->tag()); |
duke@435 | 1618 | } |
duke@435 | 1619 | } |
duke@435 | 1620 | } |
duke@435 | 1621 | |
duke@435 | 1622 | // return the results from the collection |
duke@435 | 1623 | // |
duke@435 | 1624 | jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { |
duke@435 | 1625 | jvmtiError error; |
duke@435 | 1626 | int count = _object_results->length(); |
duke@435 | 1627 | assert(count >= 0, "sanity check"); |
duke@435 | 1628 | |
duke@435 | 1629 | // if object_result_ptr is not NULL then allocate the result and copy |
duke@435 | 1630 | // in the object references. |
duke@435 | 1631 | if (object_result_ptr != NULL) { |
duke@435 | 1632 | error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); |
duke@435 | 1633 | if (error != JVMTI_ERROR_NONE) { |
duke@435 | 1634 | return error; |
duke@435 | 1635 | } |
duke@435 | 1636 | for (int i=0; i<count; i++) { |
duke@435 | 1637 | (*object_result_ptr)[i] = _object_results->at(i); |
duke@435 | 1638 | } |
duke@435 | 1639 | } |
duke@435 | 1640 | |
duke@435 | 1641 | // if tag_result_ptr is not NULL then allocate the result and copy |
duke@435 | 1642 | // in the tag values. |
duke@435 | 1643 | if (tag_result_ptr != NULL) { |
duke@435 | 1644 | error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); |
duke@435 | 1645 | if (error != JVMTI_ERROR_NONE) { |
duke@435 | 1646 | if (object_result_ptr != NULL) { |
duke@435 | 1647 | _env->Deallocate((unsigned char*)object_result_ptr); |
duke@435 | 1648 | } |
duke@435 | 1649 | return error; |
duke@435 | 1650 | } |
duke@435 | 1651 | for (int i=0; i<count; i++) { |
duke@435 | 1652 | (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); |
duke@435 | 1653 | } |
duke@435 | 1654 | } |
duke@435 | 1655 | |
duke@435 | 1656 | *count_ptr = count; |
duke@435 | 1657 | return JVMTI_ERROR_NONE; |
duke@435 | 1658 | } |
duke@435 | 1659 | }; |
duke@435 | 1660 | |
duke@435 | 1661 | // return the list of objects with the specified tags |
duke@435 | 1662 | jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, |
duke@435 | 1663 | jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { |
duke@435 | 1664 | |
duke@435 | 1665 | TagObjectCollector collector(env(), tags, count); |
duke@435 | 1666 | { |
duke@435 | 1667 | // iterate over all tagged objects |
duke@435 | 1668 | MutexLocker ml(lock()); |
duke@435 | 1669 | entry_iterate(&collector); |
duke@435 | 1670 | } |
duke@435 | 1671 | return collector.result(count_ptr, object_result_ptr, tag_result_ptr); |
duke@435 | 1672 | } |
duke@435 | 1673 | |
duke@435 | 1674 | |
duke@435 | 1675 | // ObjectMarker is used to support the marking objects when walking the |
duke@435 | 1676 | // heap. |
duke@435 | 1677 | // |
duke@435 | 1678 | // This implementation uses the existing mark bits in an object for |
duke@435 | 1679 | // marking. Objects that are marked must later have their headers restored. |
duke@435 | 1680 | // As most objects are unlocked and don't have their identity hash computed |
duke@435 | 1681 | // we don't have to save their headers. Instead we save the headers that |
duke@435 | 1682 | // are "interesting". Later when the headers are restored this implementation |
duke@435 | 1683 | // restores all headers to their initial value and then restores the few |
duke@435 | 1684 | // objects that had interesting headers. |
duke@435 | 1685 | // |
duke@435 | 1686 | // Future work: This implementation currently uses growable arrays to save |
duke@435 | 1687 | // the oop and header of interesting objects. As an optimization we could |
duke@435 | 1688 | // use the same technique as the GC and make use of the unused area |
duke@435 | 1689 | // between top() and end(). |
duke@435 | 1690 | // |
duke@435 | 1691 | |
duke@435 | 1692 | // An ObjectClosure used to restore the mark bits of an object |
duke@435 | 1693 | class RestoreMarksClosure : public ObjectClosure { |
duke@435 | 1694 | public: |
duke@435 | 1695 | void do_object(oop o) { |
duke@435 | 1696 | if (o != NULL) { |
duke@435 | 1697 | markOop mark = o->mark(); |
duke@435 | 1698 | if (mark->is_marked()) { |
duke@435 | 1699 | o->init_mark(); |
duke@435 | 1700 | } |
duke@435 | 1701 | } |
duke@435 | 1702 | } |
duke@435 | 1703 | }; |
duke@435 | 1704 | |
duke@435 | 1705 | // ObjectMarker provides the mark and visited functions |
duke@435 | 1706 | class ObjectMarker : AllStatic { |
duke@435 | 1707 | private: |
duke@435 | 1708 | // saved headers |
duke@435 | 1709 | static GrowableArray<oop>* _saved_oop_stack; |
duke@435 | 1710 | static GrowableArray<markOop>* _saved_mark_stack; |
duke@435 | 1711 | |
duke@435 | 1712 | public: |
duke@435 | 1713 | static void init(); // initialize |
duke@435 | 1714 | static void done(); // clean-up |
duke@435 | 1715 | |
duke@435 | 1716 | static inline void mark(oop o); // mark an object |
duke@435 | 1717 | static inline bool visited(oop o); // check if object has been visited |
duke@435 | 1718 | }; |
duke@435 | 1719 | |
duke@435 | 1720 | GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; |
duke@435 | 1721 | GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; |
duke@435 | 1722 | |
duke@435 | 1723 | // initialize ObjectMarker - prepares for object marking |
duke@435 | 1724 | void ObjectMarker::init() { |
duke@435 | 1725 | assert(Thread::current()->is_VM_thread(), "must be VMThread"); |
duke@435 | 1726 | |
duke@435 | 1727 | // prepare heap for iteration |
duke@435 | 1728 | Universe::heap()->ensure_parsability(false); // no need to retire TLABs |
duke@435 | 1729 | |
duke@435 | 1730 | // create stacks for interesting headers |
duke@435 | 1731 | _saved_mark_stack = new (ResourceObj::C_HEAP) GrowableArray<markOop>(4000, true); |
duke@435 | 1732 | _saved_oop_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(4000, true); |
duke@435 | 1733 | |
duke@435 | 1734 | if (UseBiasedLocking) { |
duke@435 | 1735 | BiasedLocking::preserve_marks(); |
duke@435 | 1736 | } |
duke@435 | 1737 | } |
duke@435 | 1738 | |
duke@435 | 1739 | // Object marking is done so restore object headers |
duke@435 | 1740 | void ObjectMarker::done() { |
duke@435 | 1741 | // iterate over all objects and restore the mark bits to |
duke@435 | 1742 | // their initial value |
duke@435 | 1743 | RestoreMarksClosure blk; |
duke@435 | 1744 | Universe::heap()->object_iterate(&blk); |
duke@435 | 1745 | |
duke@435 | 1746 | // When sharing is enabled we need to restore the headers of the objects |
duke@435 | 1747 | // in the readwrite space too. |
duke@435 | 1748 | if (UseSharedSpaces) { |
duke@435 | 1749 | GenCollectedHeap* gch = GenCollectedHeap::heap(); |
duke@435 | 1750 | CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); |
duke@435 | 1751 | gen->rw_space()->object_iterate(&blk); |
duke@435 | 1752 | } |
duke@435 | 1753 | |
duke@435 | 1754 | // now restore the interesting headers |
duke@435 | 1755 | for (int i = 0; i < _saved_oop_stack->length(); i++) { |
duke@435 | 1756 | oop o = _saved_oop_stack->at(i); |
duke@435 | 1757 | markOop mark = _saved_mark_stack->at(i); |
duke@435 | 1758 | o->set_mark(mark); |
duke@435 | 1759 | } |
duke@435 | 1760 | |
duke@435 | 1761 | if (UseBiasedLocking) { |
duke@435 | 1762 | BiasedLocking::restore_marks(); |
duke@435 | 1763 | } |
duke@435 | 1764 | |
duke@435 | 1765 | // free the stacks |
duke@435 | 1766 | delete _saved_oop_stack; |
duke@435 | 1767 | delete _saved_mark_stack; |
duke@435 | 1768 | } |
duke@435 | 1769 | |
duke@435 | 1770 | // mark an object |
duke@435 | 1771 | inline void ObjectMarker::mark(oop o) { |
duke@435 | 1772 | assert(Universe::heap()->is_in(o), "sanity check"); |
duke@435 | 1773 | assert(!o->mark()->is_marked(), "should only mark an object once"); |
duke@435 | 1774 | |
duke@435 | 1775 | // object's mark word |
duke@435 | 1776 | markOop mark = o->mark(); |
duke@435 | 1777 | |
duke@435 | 1778 | if (mark->must_be_preserved(o)) { |
duke@435 | 1779 | _saved_mark_stack->push(mark); |
duke@435 | 1780 | _saved_oop_stack->push(o); |
duke@435 | 1781 | } |
duke@435 | 1782 | |
duke@435 | 1783 | // mark the object |
duke@435 | 1784 | o->set_mark(markOopDesc::prototype()->set_marked()); |
duke@435 | 1785 | } |
duke@435 | 1786 | |
duke@435 | 1787 | // return true if object is marked |
duke@435 | 1788 | inline bool ObjectMarker::visited(oop o) { |
duke@435 | 1789 | return o->mark()->is_marked(); |
duke@435 | 1790 | } |
duke@435 | 1791 | |
duke@435 | 1792 | // Stack allocated class to help ensure that ObjectMarker is used |
duke@435 | 1793 | // correctly. Constructor initializes ObjectMarker, destructor calls |
duke@435 | 1794 | // ObjectMarker's done() function to restore object headers. |
duke@435 | 1795 | class ObjectMarkerController : public StackObj { |
duke@435 | 1796 | public: |
duke@435 | 1797 | ObjectMarkerController() { |
duke@435 | 1798 | ObjectMarker::init(); |
duke@435 | 1799 | } |
duke@435 | 1800 | ~ObjectMarkerController() { |
duke@435 | 1801 | ObjectMarker::done(); |
duke@435 | 1802 | } |
duke@435 | 1803 | }; |
duke@435 | 1804 | |
duke@435 | 1805 | |
duke@435 | 1806 | // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind |
duke@435 | 1807 | // (not performance critical as only used for roots) |
duke@435 | 1808 | static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { |
duke@435 | 1809 | switch (kind) { |
duke@435 | 1810 | case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; |
duke@435 | 1811 | case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; |
duke@435 | 1812 | case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; |
duke@435 | 1813 | case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; |
duke@435 | 1814 | case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; |
duke@435 | 1815 | case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; |
duke@435 | 1816 | case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; |
duke@435 | 1817 | default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; |
duke@435 | 1818 | } |
duke@435 | 1819 | } |
duke@435 | 1820 | |
duke@435 | 1821 | // Base class for all heap walk contexts. The base class maintains a flag |
duke@435 | 1822 | // to indicate if the context is valid or not. |
duke@435 | 1823 | class HeapWalkContext VALUE_OBJ_CLASS_SPEC { |
duke@435 | 1824 | private: |
duke@435 | 1825 | bool _valid; |
duke@435 | 1826 | public: |
duke@435 | 1827 | HeapWalkContext(bool valid) { _valid = valid; } |
duke@435 | 1828 | void invalidate() { _valid = false; } |
duke@435 | 1829 | bool is_valid() const { return _valid; } |
duke@435 | 1830 | }; |
duke@435 | 1831 | |
duke@435 | 1832 | // A basic heap walk context for the deprecated heap walking functions. |
duke@435 | 1833 | // The context for a basic heap walk are the callbacks and fields used by |
duke@435 | 1834 | // the referrer caching scheme. |
duke@435 | 1835 | class BasicHeapWalkContext: public HeapWalkContext { |
duke@435 | 1836 | private: |
duke@435 | 1837 | jvmtiHeapRootCallback _heap_root_callback; |
duke@435 | 1838 | jvmtiStackReferenceCallback _stack_ref_callback; |
duke@435 | 1839 | jvmtiObjectReferenceCallback _object_ref_callback; |
duke@435 | 1840 | |
duke@435 | 1841 | // used for caching |
duke@435 | 1842 | oop _last_referrer; |
duke@435 | 1843 | jlong _last_referrer_tag; |
duke@435 | 1844 | |
duke@435 | 1845 | public: |
duke@435 | 1846 | BasicHeapWalkContext() : HeapWalkContext(false) { } |
duke@435 | 1847 | |
duke@435 | 1848 | BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, |
duke@435 | 1849 | jvmtiStackReferenceCallback stack_ref_callback, |
duke@435 | 1850 | jvmtiObjectReferenceCallback object_ref_callback) : |
duke@435 | 1851 | HeapWalkContext(true), |
duke@435 | 1852 | _heap_root_callback(heap_root_callback), |
duke@435 | 1853 | _stack_ref_callback(stack_ref_callback), |
duke@435 | 1854 | _object_ref_callback(object_ref_callback), |
duke@435 | 1855 | _last_referrer(NULL), |
duke@435 | 1856 | _last_referrer_tag(0) { |
duke@435 | 1857 | } |
duke@435 | 1858 | |
duke@435 | 1859 | // accessors |
duke@435 | 1860 | jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } |
duke@435 | 1861 | jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } |
duke@435 | 1862 | jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } |
duke@435 | 1863 | |
duke@435 | 1864 | oop last_referrer() const { return _last_referrer; } |
duke@435 | 1865 | void set_last_referrer(oop referrer) { _last_referrer = referrer; } |
duke@435 | 1866 | jlong last_referrer_tag() const { return _last_referrer_tag; } |
duke@435 | 1867 | void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } |
duke@435 | 1868 | }; |
duke@435 | 1869 | |
duke@435 | 1870 | // The advanced heap walk context for the FollowReferences functions. |
duke@435 | 1871 | // The context is the callbacks, and the fields used for filtering. |
duke@435 | 1872 | class AdvancedHeapWalkContext: public HeapWalkContext { |
duke@435 | 1873 | private: |
duke@435 | 1874 | jint _heap_filter; |
duke@435 | 1875 | KlassHandle _klass_filter; |
duke@435 | 1876 | const jvmtiHeapCallbacks* _heap_callbacks; |
duke@435 | 1877 | |
duke@435 | 1878 | public: |
duke@435 | 1879 | AdvancedHeapWalkContext() : HeapWalkContext(false) { } |
duke@435 | 1880 | |
duke@435 | 1881 | AdvancedHeapWalkContext(jint heap_filter, |
duke@435 | 1882 | KlassHandle klass_filter, |
duke@435 | 1883 | const jvmtiHeapCallbacks* heap_callbacks) : |
duke@435 | 1884 | HeapWalkContext(true), |
duke@435 | 1885 | _heap_filter(heap_filter), |
duke@435 | 1886 | _klass_filter(klass_filter), |
duke@435 | 1887 | _heap_callbacks(heap_callbacks) { |
duke@435 | 1888 | } |
duke@435 | 1889 | |
duke@435 | 1890 | // accessors |
duke@435 | 1891 | jint heap_filter() const { return _heap_filter; } |
duke@435 | 1892 | KlassHandle klass_filter() const { return _klass_filter; } |
duke@435 | 1893 | |
duke@435 | 1894 | const jvmtiHeapReferenceCallback heap_reference_callback() const { |
duke@435 | 1895 | return _heap_callbacks->heap_reference_callback; |
duke@435 | 1896 | }; |
duke@435 | 1897 | const jvmtiPrimitiveFieldCallback primitive_field_callback() const { |
duke@435 | 1898 | return _heap_callbacks->primitive_field_callback; |
duke@435 | 1899 | } |
duke@435 | 1900 | const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { |
duke@435 | 1901 | return _heap_callbacks->array_primitive_value_callback; |
duke@435 | 1902 | } |
duke@435 | 1903 | const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { |
duke@435 | 1904 | return _heap_callbacks->string_primitive_value_callback; |
duke@435 | 1905 | } |
duke@435 | 1906 | }; |
duke@435 | 1907 | |
duke@435 | 1908 | // The CallbackInvoker is a class with static functions that the heap walk can call |
duke@435 | 1909 | // into to invoke callbacks. It works in one of two modes. The "basic" mode is |
duke@435 | 1910 | // used for the deprecated IterateOverReachableObjects functions. The "advanced" |
duke@435 | 1911 | // mode is for the newer FollowReferences function which supports a lot of |
duke@435 | 1912 | // additional callbacks. |
duke@435 | 1913 | class CallbackInvoker : AllStatic { |
duke@435 | 1914 | private: |
duke@435 | 1915 | // heap walk styles |
duke@435 | 1916 | enum { basic, advanced }; |
duke@435 | 1917 | static int _heap_walk_type; |
duke@435 | 1918 | static bool is_basic_heap_walk() { return _heap_walk_type == basic; } |
duke@435 | 1919 | static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } |
duke@435 | 1920 | |
duke@435 | 1921 | // context for basic style heap walk |
duke@435 | 1922 | static BasicHeapWalkContext _basic_context; |
duke@435 | 1923 | static BasicHeapWalkContext* basic_context() { |
duke@435 | 1924 | assert(_basic_context.is_valid(), "invalid"); |
duke@435 | 1925 | return &_basic_context; |
duke@435 | 1926 | } |
duke@435 | 1927 | |
duke@435 | 1928 | // context for advanced style heap walk |
duke@435 | 1929 | static AdvancedHeapWalkContext _advanced_context; |
duke@435 | 1930 | static AdvancedHeapWalkContext* advanced_context() { |
duke@435 | 1931 | assert(_advanced_context.is_valid(), "invalid"); |
duke@435 | 1932 | return &_advanced_context; |
duke@435 | 1933 | } |
duke@435 | 1934 | |
duke@435 | 1935 | // context needed for all heap walks |
duke@435 | 1936 | static JvmtiTagMap* _tag_map; |
duke@435 | 1937 | static const void* _user_data; |
duke@435 | 1938 | static GrowableArray<oop>* _visit_stack; |
duke@435 | 1939 | |
duke@435 | 1940 | // accessors |
duke@435 | 1941 | static JvmtiTagMap* tag_map() { return _tag_map; } |
duke@435 | 1942 | static const void* user_data() { return _user_data; } |
duke@435 | 1943 | static GrowableArray<oop>* visit_stack() { return _visit_stack; } |
duke@435 | 1944 | |
duke@435 | 1945 | // if the object hasn't been visited then push it onto the visit stack |
duke@435 | 1946 | // so that it will be visited later |
duke@435 | 1947 | static inline bool check_for_visit(oop obj) { |
duke@435 | 1948 | if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); |
duke@435 | 1949 | return true; |
duke@435 | 1950 | } |
duke@435 | 1951 | |
duke@435 | 1952 | // invoke basic style callbacks |
duke@435 | 1953 | static inline bool invoke_basic_heap_root_callback |
duke@435 | 1954 | (jvmtiHeapRootKind root_kind, oop obj); |
duke@435 | 1955 | static inline bool invoke_basic_stack_ref_callback |
duke@435 | 1956 | (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, |
duke@435 | 1957 | int slot, oop obj); |
duke@435 | 1958 | static inline bool invoke_basic_object_reference_callback |
duke@435 | 1959 | (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); |
duke@435 | 1960 | |
duke@435 | 1961 | // invoke advanced style callbacks |
duke@435 | 1962 | static inline bool invoke_advanced_heap_root_callback |
duke@435 | 1963 | (jvmtiHeapReferenceKind ref_kind, oop obj); |
duke@435 | 1964 | static inline bool invoke_advanced_stack_ref_callback |
duke@435 | 1965 | (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, |
duke@435 | 1966 | jmethodID method, jlocation bci, jint slot, oop obj); |
duke@435 | 1967 | static inline bool invoke_advanced_object_reference_callback |
duke@435 | 1968 | (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); |
duke@435 | 1969 | |
duke@435 | 1970 | // used to report the value of primitive fields |
duke@435 | 1971 | static inline bool report_primitive_field |
duke@435 | 1972 | (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); |
duke@435 | 1973 | |
duke@435 | 1974 | public: |
duke@435 | 1975 | // initialize for basic mode |
duke@435 | 1976 | static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, |
duke@435 | 1977 | GrowableArray<oop>* visit_stack, |
duke@435 | 1978 | const void* user_data, |
duke@435 | 1979 | BasicHeapWalkContext context); |
duke@435 | 1980 | |
duke@435 | 1981 | // initialize for advanced mode |
duke@435 | 1982 | static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, |
duke@435 | 1983 | GrowableArray<oop>* visit_stack, |
duke@435 | 1984 | const void* user_data, |
duke@435 | 1985 | AdvancedHeapWalkContext context); |
duke@435 | 1986 | |
duke@435 | 1987 | // functions to report roots |
duke@435 | 1988 | static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); |
duke@435 | 1989 | static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, |
duke@435 | 1990 | jmethodID m, oop o); |
duke@435 | 1991 | static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, |
duke@435 | 1992 | jmethodID method, jlocation bci, jint slot, oop o); |
duke@435 | 1993 | |
duke@435 | 1994 | // functions to report references |
duke@435 | 1995 | static inline bool report_array_element_reference(oop referrer, oop referree, jint index); |
duke@435 | 1996 | static inline bool report_class_reference(oop referrer, oop referree); |
duke@435 | 1997 | static inline bool report_class_loader_reference(oop referrer, oop referree); |
duke@435 | 1998 | static inline bool report_signers_reference(oop referrer, oop referree); |
duke@435 | 1999 | static inline bool report_protection_domain_reference(oop referrer, oop referree); |
duke@435 | 2000 | static inline bool report_superclass_reference(oop referrer, oop referree); |
duke@435 | 2001 | static inline bool report_interface_reference(oop referrer, oop referree); |
duke@435 | 2002 | static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); |
duke@435 | 2003 | static inline bool report_field_reference(oop referrer, oop referree, jint slot); |
duke@435 | 2004 | static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); |
duke@435 | 2005 | static inline bool report_primitive_array_values(oop array); |
duke@435 | 2006 | static inline bool report_string_value(oop str); |
duke@435 | 2007 | static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); |
duke@435 | 2008 | static inline bool report_primitive_static_field(oop o, jint index, address value, char type); |
duke@435 | 2009 | }; |
duke@435 | 2010 | |
duke@435 | 2011 | // statics |
duke@435 | 2012 | int CallbackInvoker::_heap_walk_type; |
duke@435 | 2013 | BasicHeapWalkContext CallbackInvoker::_basic_context; |
duke@435 | 2014 | AdvancedHeapWalkContext CallbackInvoker::_advanced_context; |
duke@435 | 2015 | JvmtiTagMap* CallbackInvoker::_tag_map; |
duke@435 | 2016 | const void* CallbackInvoker::_user_data; |
duke@435 | 2017 | GrowableArray<oop>* CallbackInvoker::_visit_stack; |
duke@435 | 2018 | |
duke@435 | 2019 | // initialize for basic heap walk (IterateOverReachableObjects et al) |
duke@435 | 2020 | void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, |
duke@435 | 2021 | GrowableArray<oop>* visit_stack, |
duke@435 | 2022 | const void* user_data, |
duke@435 | 2023 | BasicHeapWalkContext context) { |
duke@435 | 2024 | _tag_map = tag_map; |
duke@435 | 2025 | _visit_stack = visit_stack; |
duke@435 | 2026 | _user_data = user_data; |
duke@435 | 2027 | _basic_context = context; |
duke@435 | 2028 | _advanced_context.invalidate(); // will trigger assertion if used |
duke@435 | 2029 | _heap_walk_type = basic; |
duke@435 | 2030 | } |
duke@435 | 2031 | |
duke@435 | 2032 | // initialize for advanced heap walk (FollowReferences) |
duke@435 | 2033 | void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, |
duke@435 | 2034 | GrowableArray<oop>* visit_stack, |
duke@435 | 2035 | const void* user_data, |
duke@435 | 2036 | AdvancedHeapWalkContext context) { |
duke@435 | 2037 | _tag_map = tag_map; |
duke@435 | 2038 | _visit_stack = visit_stack; |
duke@435 | 2039 | _user_data = user_data; |
duke@435 | 2040 | _advanced_context = context; |
duke@435 | 2041 | _basic_context.invalidate(); // will trigger assertion if used |
duke@435 | 2042 | _heap_walk_type = advanced; |
duke@435 | 2043 | } |
duke@435 | 2044 | |
duke@435 | 2045 | |
duke@435 | 2046 | // invoke basic style heap root callback |
duke@435 | 2047 | inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { |
duke@435 | 2048 | assert(ServiceUtil::visible_oop(obj), "checking"); |
duke@435 | 2049 | |
duke@435 | 2050 | // if we heap roots should be reported |
duke@435 | 2051 | jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); |
duke@435 | 2052 | if (cb == NULL) { |
duke@435 | 2053 | return check_for_visit(obj); |
duke@435 | 2054 | } |
duke@435 | 2055 | |
duke@435 | 2056 | CallbackWrapper wrapper(tag_map(), obj); |
duke@435 | 2057 | jvmtiIterationControl control = (*cb)(root_kind, |
duke@435 | 2058 | wrapper.klass_tag(), |
duke@435 | 2059 | wrapper.obj_size(), |
duke@435 | 2060 | wrapper.obj_tag_p(), |
duke@435 | 2061 | (void*)user_data()); |
duke@435 | 2062 | // push root to visit stack when following references |
duke@435 | 2063 | if (control == JVMTI_ITERATION_CONTINUE && |
duke@435 | 2064 | basic_context()->object_ref_callback() != NULL) { |
duke@435 | 2065 | visit_stack()->push(obj); |
duke@435 | 2066 | } |
duke@435 | 2067 | return control != JVMTI_ITERATION_ABORT; |
duke@435 | 2068 | } |
duke@435 | 2069 | |
duke@435 | 2070 | // invoke basic style stack ref callback |
duke@435 | 2071 | inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, |
duke@435 | 2072 | jlong thread_tag, |
duke@435 | 2073 | jint depth, |
duke@435 | 2074 | jmethodID method, |
duke@435 | 2075 | jint slot, |
duke@435 | 2076 | oop obj) { |
duke@435 | 2077 | assert(ServiceUtil::visible_oop(obj), "checking"); |
duke@435 | 2078 | |
duke@435 | 2079 | // if we stack refs should be reported |
duke@435 | 2080 | jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); |
duke@435 | 2081 | if (cb == NULL) { |
duke@435 | 2082 | return check_for_visit(obj); |
duke@435 | 2083 | } |
duke@435 | 2084 | |
duke@435 | 2085 | CallbackWrapper wrapper(tag_map(), obj); |
duke@435 | 2086 | jvmtiIterationControl control = (*cb)(root_kind, |
duke@435 | 2087 | wrapper.klass_tag(), |
duke@435 | 2088 | wrapper.obj_size(), |
duke@435 | 2089 | wrapper.obj_tag_p(), |
duke@435 | 2090 | thread_tag, |
duke@435 | 2091 | depth, |
duke@435 | 2092 | method, |
duke@435 | 2093 | slot, |
duke@435 | 2094 | (void*)user_data()); |
duke@435 | 2095 | // push root to visit stack when following references |
duke@435 | 2096 | if (control == JVMTI_ITERATION_CONTINUE && |
duke@435 | 2097 | basic_context()->object_ref_callback() != NULL) { |
duke@435 | 2098 | visit_stack()->push(obj); |
duke@435 | 2099 | } |
duke@435 | 2100 | return control != JVMTI_ITERATION_ABORT; |
duke@435 | 2101 | } |
duke@435 | 2102 | |
duke@435 | 2103 | // invoke basic style object reference callback |
duke@435 | 2104 | inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, |
duke@435 | 2105 | oop referrer, |
duke@435 | 2106 | oop referree, |
duke@435 | 2107 | jint index) { |
duke@435 | 2108 | |
duke@435 | 2109 | assert(ServiceUtil::visible_oop(referrer), "checking"); |
duke@435 | 2110 | assert(ServiceUtil::visible_oop(referree), "checking"); |
duke@435 | 2111 | |
duke@435 | 2112 | BasicHeapWalkContext* context = basic_context(); |
duke@435 | 2113 | |
duke@435 | 2114 | // callback requires the referrer's tag. If it's the same referrer |
duke@435 | 2115 | // as the last call then we use the cached value. |
duke@435 | 2116 | jlong referrer_tag; |
duke@435 | 2117 | if (referrer == context->last_referrer()) { |
duke@435 | 2118 | referrer_tag = context->last_referrer_tag(); |
duke@435 | 2119 | } else { |
duke@435 | 2120 | referrer_tag = tag_for(tag_map(), klassOop_if_java_lang_Class(referrer)); |
duke@435 | 2121 | } |
duke@435 | 2122 | |
duke@435 | 2123 | // do the callback |
duke@435 | 2124 | CallbackWrapper wrapper(tag_map(), referree); |
duke@435 | 2125 | jvmtiObjectReferenceCallback cb = context->object_ref_callback(); |
duke@435 | 2126 | jvmtiIterationControl control = (*cb)(ref_kind, |
duke@435 | 2127 | wrapper.klass_tag(), |
duke@435 | 2128 | wrapper.obj_size(), |
duke@435 | 2129 | wrapper.obj_tag_p(), |
duke@435 | 2130 | referrer_tag, |
duke@435 | 2131 | index, |
duke@435 | 2132 | (void*)user_data()); |
duke@435 | 2133 | |
duke@435 | 2134 | // record referrer and referrer tag. For self-references record the |
duke@435 | 2135 | // tag value from the callback as this might differ from referrer_tag. |
duke@435 | 2136 | context->set_last_referrer(referrer); |
duke@435 | 2137 | if (referrer == referree) { |
duke@435 | 2138 | context->set_last_referrer_tag(*wrapper.obj_tag_p()); |
duke@435 | 2139 | } else { |
duke@435 | 2140 | context->set_last_referrer_tag(referrer_tag); |
duke@435 | 2141 | } |
duke@435 | 2142 | |
duke@435 | 2143 | if (control == JVMTI_ITERATION_CONTINUE) { |
duke@435 | 2144 | return check_for_visit(referree); |
duke@435 | 2145 | } else { |
duke@435 | 2146 | return control != JVMTI_ITERATION_ABORT; |
duke@435 | 2147 | } |
duke@435 | 2148 | } |
duke@435 | 2149 | |
duke@435 | 2150 | // invoke advanced style heap root callback |
duke@435 | 2151 | inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, |
duke@435 | 2152 | oop obj) { |
duke@435 | 2153 | assert(ServiceUtil::visible_oop(obj), "checking"); |
duke@435 | 2154 | |
duke@435 | 2155 | AdvancedHeapWalkContext* context = advanced_context(); |
duke@435 | 2156 | |
duke@435 | 2157 | // check that callback is provided |
duke@435 | 2158 | jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); |
duke@435 | 2159 | if (cb == NULL) { |
duke@435 | 2160 | return check_for_visit(obj); |
duke@435 | 2161 | } |
duke@435 | 2162 | |
duke@435 | 2163 | // apply class filter |
duke@435 | 2164 | if (is_filtered_by_klass_filter(obj, context->klass_filter())) { |
duke@435 | 2165 | return check_for_visit(obj); |
duke@435 | 2166 | } |
duke@435 | 2167 | |
duke@435 | 2168 | // setup the callback wrapper |
duke@435 | 2169 | CallbackWrapper wrapper(tag_map(), obj); |
duke@435 | 2170 | |
duke@435 | 2171 | // apply tag filter |
duke@435 | 2172 | if (is_filtered_by_heap_filter(wrapper.obj_tag(), |
duke@435 | 2173 | wrapper.klass_tag(), |
duke@435 | 2174 | context->heap_filter())) { |
duke@435 | 2175 | return check_for_visit(obj); |
duke@435 | 2176 | } |
duke@435 | 2177 | |
duke@435 | 2178 | // for arrays we need the length, otherwise -1 |
duke@435 | 2179 | jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); |
duke@435 | 2180 | |
duke@435 | 2181 | // invoke the callback |
duke@435 | 2182 | jint res = (*cb)(ref_kind, |
duke@435 | 2183 | NULL, // referrer info |
duke@435 | 2184 | wrapper.klass_tag(), |
duke@435 | 2185 | 0, // referrer_class_tag is 0 for heap root |
duke@435 | 2186 | wrapper.obj_size(), |
duke@435 | 2187 | wrapper.obj_tag_p(), |
duke@435 | 2188 | NULL, // referrer_tag_p |
duke@435 | 2189 | len, |
duke@435 | 2190 | (void*)user_data()); |
duke@435 | 2191 | if (res & JVMTI_VISIT_ABORT) { |
duke@435 | 2192 | return false;// referrer class tag |
duke@435 | 2193 | } |
duke@435 | 2194 | if (res & JVMTI_VISIT_OBJECTS) { |
duke@435 | 2195 | check_for_visit(obj); |
duke@435 | 2196 | } |
duke@435 | 2197 | return true; |
duke@435 | 2198 | } |
duke@435 | 2199 | |
duke@435 | 2200 | // report a reference from a thread stack to an object |
duke@435 | 2201 | inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, |
duke@435 | 2202 | jlong thread_tag, |
duke@435 | 2203 | jlong tid, |
duke@435 | 2204 | int depth, |
duke@435 | 2205 | jmethodID method, |
duke@435 | 2206 | jlocation bci, |
duke@435 | 2207 | jint slot, |
duke@435 | 2208 | oop obj) { |
duke@435 | 2209 | assert(ServiceUtil::visible_oop(obj), "checking"); |
duke@435 | 2210 | |
duke@435 | 2211 | AdvancedHeapWalkContext* context = advanced_context(); |
duke@435 | 2212 | |
duke@435 | 2213 | // check that callback is provider |
duke@435 | 2214 | jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); |
duke@435 | 2215 | if (cb == NULL) { |
duke@435 | 2216 | return check_for_visit(obj); |
duke@435 | 2217 | } |
duke@435 | 2218 | |
duke@435 | 2219 | // apply class filter |
duke@435 | 2220 | if (is_filtered_by_klass_filter(obj, context->klass_filter())) { |
duke@435 | 2221 | return check_for_visit(obj); |
duke@435 | 2222 | } |
duke@435 | 2223 | |
duke@435 | 2224 | // setup the callback wrapper |
duke@435 | 2225 | CallbackWrapper wrapper(tag_map(), obj); |
duke@435 | 2226 | |
duke@435 | 2227 | // apply tag filter |
duke@435 | 2228 | if (is_filtered_by_heap_filter(wrapper.obj_tag(), |
duke@435 | 2229 | wrapper.klass_tag(), |
duke@435 | 2230 | context->heap_filter())) { |
duke@435 | 2231 | return check_for_visit(obj); |
duke@435 | 2232 | } |
duke@435 | 2233 | |
duke@435 | 2234 | // setup the referrer info |
duke@435 | 2235 | jvmtiHeapReferenceInfo reference_info; |
duke@435 | 2236 | reference_info.stack_local.thread_tag = thread_tag; |
duke@435 | 2237 | reference_info.stack_local.thread_id = tid; |
duke@435 | 2238 | reference_info.stack_local.depth = depth; |
duke@435 | 2239 | reference_info.stack_local.method = method; |
duke@435 | 2240 | reference_info.stack_local.location = bci; |
duke@435 | 2241 | reference_info.stack_local.slot = slot; |
duke@435 | 2242 | |
duke@435 | 2243 | // for arrays we need the length, otherwise -1 |
duke@435 | 2244 | jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); |
duke@435 | 2245 | |
duke@435 | 2246 | // call into the agent |
duke@435 | 2247 | int res = (*cb)(ref_kind, |
duke@435 | 2248 | &reference_info, |
duke@435 | 2249 | wrapper.klass_tag(), |
duke@435 | 2250 | 0, // referrer_class_tag is 0 for heap root (stack) |
duke@435 | 2251 | wrapper.obj_size(), |
duke@435 | 2252 | wrapper.obj_tag_p(), |
duke@435 | 2253 | NULL, // referrer_tag is 0 for root |
duke@435 | 2254 | len, |
duke@435 | 2255 | (void*)user_data()); |
duke@435 | 2256 | |
duke@435 | 2257 | if (res & JVMTI_VISIT_ABORT) { |
duke@435 | 2258 | return false; |
duke@435 | 2259 | } |
duke@435 | 2260 | if (res & JVMTI_VISIT_OBJECTS) { |
duke@435 | 2261 | check_for_visit(obj); |
duke@435 | 2262 | } |
duke@435 | 2263 | return true; |
duke@435 | 2264 | } |
duke@435 | 2265 | |
duke@435 | 2266 | // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback |
duke@435 | 2267 | // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. |
duke@435 | 2268 | #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ |
duke@435 | 2269 | | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ |
duke@435 | 2270 | | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ |
duke@435 | 2271 | | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ |
duke@435 | 2272 | | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ |
duke@435 | 2273 | | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) |
duke@435 | 2274 | |
duke@435 | 2275 | // invoke the object reference callback to report a reference |
duke@435 | 2276 | inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, |
duke@435 | 2277 | oop referrer, |
duke@435 | 2278 | oop obj, |
duke@435 | 2279 | jint index) |
duke@435 | 2280 | { |
duke@435 | 2281 | // field index is only valid field in reference_info |
duke@435 | 2282 | static jvmtiHeapReferenceInfo reference_info = { 0 }; |
duke@435 | 2283 | |
duke@435 | 2284 | assert(ServiceUtil::visible_oop(referrer), "checking"); |
duke@435 | 2285 | assert(ServiceUtil::visible_oop(obj), "checking"); |
duke@435 | 2286 | |
duke@435 | 2287 | AdvancedHeapWalkContext* context = advanced_context(); |
duke@435 | 2288 | |
duke@435 | 2289 | // check that callback is provider |
duke@435 | 2290 | jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); |
duke@435 | 2291 | if (cb == NULL) { |
duke@435 | 2292 | return check_for_visit(obj); |
duke@435 | 2293 | } |
duke@435 | 2294 | |
duke@435 | 2295 | // apply class filter |
duke@435 | 2296 | if (is_filtered_by_klass_filter(obj, context->klass_filter())) { |
duke@435 | 2297 | return check_for_visit(obj); |
duke@435 | 2298 | } |
duke@435 | 2299 | |
duke@435 | 2300 | // setup the callback wrapper |
duke@435 | 2301 | TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); |
duke@435 | 2302 | |
duke@435 | 2303 | // apply tag filter |
duke@435 | 2304 | if (is_filtered_by_heap_filter(wrapper.obj_tag(), |
duke@435 | 2305 | wrapper.klass_tag(), |
duke@435 | 2306 | context->heap_filter())) { |
duke@435 | 2307 | return check_for_visit(obj); |
duke@435 | 2308 | } |
duke@435 | 2309 | |
duke@435 | 2310 | // field index is only valid field in reference_info |
duke@435 | 2311 | reference_info.field.index = index; |
duke@435 | 2312 | |
duke@435 | 2313 | // for arrays we need the length, otherwise -1 |
duke@435 | 2314 | jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); |
duke@435 | 2315 | |
duke@435 | 2316 | // invoke the callback |
duke@435 | 2317 | int res = (*cb)(ref_kind, |
duke@435 | 2318 | (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, |
duke@435 | 2319 | wrapper.klass_tag(), |
duke@435 | 2320 | wrapper.referrer_klass_tag(), |
duke@435 | 2321 | wrapper.obj_size(), |
duke@435 | 2322 | wrapper.obj_tag_p(), |
duke@435 | 2323 | wrapper.referrer_tag_p(), |
duke@435 | 2324 | len, |
duke@435 | 2325 | (void*)user_data()); |
duke@435 | 2326 | |
duke@435 | 2327 | if (res & JVMTI_VISIT_ABORT) { |
duke@435 | 2328 | return false; |
duke@435 | 2329 | } |
duke@435 | 2330 | if (res & JVMTI_VISIT_OBJECTS) { |
duke@435 | 2331 | check_for_visit(obj); |
duke@435 | 2332 | } |
duke@435 | 2333 | return true; |
duke@435 | 2334 | } |
duke@435 | 2335 | |
duke@435 | 2336 | // report a "simple root" |
duke@435 | 2337 | inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { |
duke@435 | 2338 | assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && |
duke@435 | 2339 | kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); |
duke@435 | 2340 | assert(ServiceUtil::visible_oop(obj), "checking"); |
duke@435 | 2341 | |
duke@435 | 2342 | if (is_basic_heap_walk()) { |
duke@435 | 2343 | // map to old style root kind |
duke@435 | 2344 | jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); |
duke@435 | 2345 | return invoke_basic_heap_root_callback(root_kind, obj); |
duke@435 | 2346 | } else { |
duke@435 | 2347 | assert(is_advanced_heap_walk(), "wrong heap walk type"); |
duke@435 | 2348 | return invoke_advanced_heap_root_callback(kind, obj); |
duke@435 | 2349 | } |
duke@435 | 2350 | } |
duke@435 | 2351 | |
duke@435 | 2352 | |
duke@435 | 2353 | // invoke the primitive array values |
duke@435 | 2354 | inline bool CallbackInvoker::report_primitive_array_values(oop obj) { |
duke@435 | 2355 | assert(obj->is_typeArray(), "not a primitive array"); |
duke@435 | 2356 | |
duke@435 | 2357 | AdvancedHeapWalkContext* context = advanced_context(); |
duke@435 | 2358 | assert(context->array_primitive_value_callback() != NULL, "no callback"); |
duke@435 | 2359 | |
duke@435 | 2360 | // apply class filter |
duke@435 | 2361 | if (is_filtered_by_klass_filter(obj, context->klass_filter())) { |
duke@435 | 2362 | return true; |
duke@435 | 2363 | } |
duke@435 | 2364 | |
duke@435 | 2365 | CallbackWrapper wrapper(tag_map(), obj); |
duke@435 | 2366 | |
duke@435 | 2367 | // apply tag filter |
duke@435 | 2368 | if (is_filtered_by_heap_filter(wrapper.obj_tag(), |
duke@435 | 2369 | wrapper.klass_tag(), |
duke@435 | 2370 | context->heap_filter())) { |
duke@435 | 2371 | return true; |
duke@435 | 2372 | } |
duke@435 | 2373 | |
duke@435 | 2374 | // invoke the callback |
duke@435 | 2375 | int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), |
duke@435 | 2376 | &wrapper, |
duke@435 | 2377 | obj, |
duke@435 | 2378 | (void*)user_data()); |
duke@435 | 2379 | return (!(res & JVMTI_VISIT_ABORT)); |
duke@435 | 2380 | } |
duke@435 | 2381 | |
duke@435 | 2382 | // invoke the string value callback |
duke@435 | 2383 | inline bool CallbackInvoker::report_string_value(oop str) { |
duke@435 | 2384 | assert(str->klass() == SystemDictionary::string_klass(), "not a string"); |
duke@435 | 2385 | |
duke@435 | 2386 | AdvancedHeapWalkContext* context = advanced_context(); |
duke@435 | 2387 | assert(context->string_primitive_value_callback() != NULL, "no callback"); |
duke@435 | 2388 | |
duke@435 | 2389 | // apply class filter |
duke@435 | 2390 | if (is_filtered_by_klass_filter(str, context->klass_filter())) { |
duke@435 | 2391 | return true; |
duke@435 | 2392 | } |
duke@435 | 2393 | |
duke@435 | 2394 | CallbackWrapper wrapper(tag_map(), str); |
duke@435 | 2395 | |
duke@435 | 2396 | // apply tag filter |
duke@435 | 2397 | if (is_filtered_by_heap_filter(wrapper.obj_tag(), |
duke@435 | 2398 | wrapper.klass_tag(), |
duke@435 | 2399 | context->heap_filter())) { |
duke@435 | 2400 | return true; |
duke@435 | 2401 | } |
duke@435 | 2402 | |
duke@435 | 2403 | // invoke the callback |
duke@435 | 2404 | int res = invoke_string_value_callback(context->string_primitive_value_callback(), |
duke@435 | 2405 | &wrapper, |
duke@435 | 2406 | str, |
duke@435 | 2407 | (void*)user_data()); |
duke@435 | 2408 | return (!(res & JVMTI_VISIT_ABORT)); |
duke@435 | 2409 | } |
duke@435 | 2410 | |
duke@435 | 2411 | // invoke the primitive field callback |
duke@435 | 2412 | inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, |
duke@435 | 2413 | oop obj, |
duke@435 | 2414 | jint index, |
duke@435 | 2415 | address addr, |
duke@435 | 2416 | char type) |
duke@435 | 2417 | { |
duke@435 | 2418 | // for primitive fields only the index will be set |
duke@435 | 2419 | static jvmtiHeapReferenceInfo reference_info = { 0 }; |
duke@435 | 2420 | |
duke@435 | 2421 | AdvancedHeapWalkContext* context = advanced_context(); |
duke@435 | 2422 | assert(context->primitive_field_callback() != NULL, "no callback"); |
duke@435 | 2423 | |
duke@435 | 2424 | // apply class filter |
duke@435 | 2425 | if (is_filtered_by_klass_filter(obj, context->klass_filter())) { |
duke@435 | 2426 | return true; |
duke@435 | 2427 | } |
duke@435 | 2428 | |
duke@435 | 2429 | CallbackWrapper wrapper(tag_map(), obj); |
duke@435 | 2430 | |
duke@435 | 2431 | // apply tag filter |
duke@435 | 2432 | if (is_filtered_by_heap_filter(wrapper.obj_tag(), |
duke@435 | 2433 | wrapper.klass_tag(), |
duke@435 | 2434 | context->heap_filter())) { |
duke@435 | 2435 | return true; |
duke@435 | 2436 | } |
duke@435 | 2437 | |
duke@435 | 2438 | // the field index in the referrer |
duke@435 | 2439 | reference_info.field.index = index; |
duke@435 | 2440 | |
duke@435 | 2441 | // map the type |
duke@435 | 2442 | jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; |
duke@435 | 2443 | |
duke@435 | 2444 | // setup the jvalue |
duke@435 | 2445 | jvalue value; |
duke@435 | 2446 | copy_to_jvalue(&value, addr, value_type); |
duke@435 | 2447 | |
duke@435 | 2448 | jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); |
duke@435 | 2449 | int res = (*cb)(ref_kind, |
duke@435 | 2450 | &reference_info, |
duke@435 | 2451 | wrapper.klass_tag(), |
duke@435 | 2452 | wrapper.obj_tag_p(), |
duke@435 | 2453 | value, |
duke@435 | 2454 | value_type, |
duke@435 | 2455 | (void*)user_data()); |
duke@435 | 2456 | return (!(res & JVMTI_VISIT_ABORT)); |
duke@435 | 2457 | } |
duke@435 | 2458 | |
duke@435 | 2459 | |
duke@435 | 2460 | // instance field |
duke@435 | 2461 | inline bool CallbackInvoker::report_primitive_instance_field(oop obj, |
duke@435 | 2462 | jint index, |
duke@435 | 2463 | address value, |
duke@435 | 2464 | char type) { |
duke@435 | 2465 | return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, |
duke@435 | 2466 | obj, |
duke@435 | 2467 | index, |
duke@435 | 2468 | value, |
duke@435 | 2469 | type); |
duke@435 | 2470 | } |
duke@435 | 2471 | |
duke@435 | 2472 | // static field |
duke@435 | 2473 | inline bool CallbackInvoker::report_primitive_static_field(oop obj, |
duke@435 | 2474 | jint index, |
duke@435 | 2475 | address value, |
duke@435 | 2476 | char type) { |
duke@435 | 2477 | return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, |
duke@435 | 2478 | obj, |
duke@435 | 2479 | index, |
duke@435 | 2480 | value, |
duke@435 | 2481 | type); |
duke@435 | 2482 | } |
duke@435 | 2483 | |
duke@435 | 2484 | // report a JNI local (root object) to the profiler |
duke@435 | 2485 | inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { |
duke@435 | 2486 | if (is_basic_heap_walk()) { |
duke@435 | 2487 | return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, |
duke@435 | 2488 | thread_tag, |
duke@435 | 2489 | depth, |
duke@435 | 2490 | m, |
duke@435 | 2491 | -1, |
duke@435 | 2492 | obj); |
duke@435 | 2493 | } else { |
duke@435 | 2494 | return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, |
duke@435 | 2495 | thread_tag, tid, |
duke@435 | 2496 | depth, |
duke@435 | 2497 | m, |
duke@435 | 2498 | (jlocation)-1, |
duke@435 | 2499 | -1, |
duke@435 | 2500 | obj); |
duke@435 | 2501 | } |
duke@435 | 2502 | } |
duke@435 | 2503 | |
duke@435 | 2504 | |
duke@435 | 2505 | // report a local (stack reference, root object) |
duke@435 | 2506 | inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, |
duke@435 | 2507 | jlong tid, |
duke@435 | 2508 | jint depth, |
duke@435 | 2509 | jmethodID method, |
duke@435 | 2510 | jlocation bci, |
duke@435 | 2511 | jint slot, |
duke@435 | 2512 | oop obj) { |
duke@435 | 2513 | if (is_basic_heap_walk()) { |
duke@435 | 2514 | return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, |
duke@435 | 2515 | thread_tag, |
duke@435 | 2516 | depth, |
duke@435 | 2517 | method, |
duke@435 | 2518 | slot, |
duke@435 | 2519 | obj); |
duke@435 | 2520 | } else { |
duke@435 | 2521 | return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, |
duke@435 | 2522 | thread_tag, |
duke@435 | 2523 | tid, |
duke@435 | 2524 | depth, |
duke@435 | 2525 | method, |
duke@435 | 2526 | bci, |
duke@435 | 2527 | slot, |
duke@435 | 2528 | obj); |
duke@435 | 2529 | } |
duke@435 | 2530 | } |
duke@435 | 2531 | |
duke@435 | 2532 | // report an object referencing a class. |
duke@435 | 2533 | inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { |
duke@435 | 2534 | if (is_basic_heap_walk()) { |
duke@435 | 2535 | return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); |
duke@435 | 2536 | } else { |
duke@435 | 2537 | return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); |
duke@435 | 2538 | } |
duke@435 | 2539 | } |
duke@435 | 2540 | |
duke@435 | 2541 | // report a class referencing its class loader. |
duke@435 | 2542 | inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { |
duke@435 | 2543 | if (is_basic_heap_walk()) { |
duke@435 | 2544 | return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); |
duke@435 | 2545 | } else { |
duke@435 | 2546 | return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); |
duke@435 | 2547 | } |
duke@435 | 2548 | } |
duke@435 | 2549 | |
duke@435 | 2550 | // report a class referencing its signers. |
duke@435 | 2551 | inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { |
duke@435 | 2552 | if (is_basic_heap_walk()) { |
duke@435 | 2553 | return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); |
duke@435 | 2554 | } else { |
duke@435 | 2555 | return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); |
duke@435 | 2556 | } |
duke@435 | 2557 | } |
duke@435 | 2558 | |
duke@435 | 2559 | // report a class referencing its protection domain.. |
duke@435 | 2560 | inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { |
duke@435 | 2561 | if (is_basic_heap_walk()) { |
duke@435 | 2562 | return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); |
duke@435 | 2563 | } else { |
duke@435 | 2564 | return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); |
duke@435 | 2565 | } |
duke@435 | 2566 | } |
duke@435 | 2567 | |
duke@435 | 2568 | // report a class referencing its superclass. |
duke@435 | 2569 | inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { |
duke@435 | 2570 | if (is_basic_heap_walk()) { |
duke@435 | 2571 | // Send this to be consistent with past implementation |
duke@435 | 2572 | return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); |
duke@435 | 2573 | } else { |
duke@435 | 2574 | return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); |
duke@435 | 2575 | } |
duke@435 | 2576 | } |
duke@435 | 2577 | |
duke@435 | 2578 | // report a class referencing one of its interfaces. |
duke@435 | 2579 | inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { |
duke@435 | 2580 | if (is_basic_heap_walk()) { |
duke@435 | 2581 | return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); |
duke@435 | 2582 | } else { |
duke@435 | 2583 | return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); |
duke@435 | 2584 | } |
duke@435 | 2585 | } |
duke@435 | 2586 | |
duke@435 | 2587 | // report a class referencing one of its static fields. |
duke@435 | 2588 | inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { |
duke@435 | 2589 | if (is_basic_heap_walk()) { |
duke@435 | 2590 | return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); |
duke@435 | 2591 | } else { |
duke@435 | 2592 | return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); |
duke@435 | 2593 | } |
duke@435 | 2594 | } |
duke@435 | 2595 | |
duke@435 | 2596 | // report an array referencing an element object |
duke@435 | 2597 | inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { |
duke@435 | 2598 | if (is_basic_heap_walk()) { |
duke@435 | 2599 | return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); |
duke@435 | 2600 | } else { |
duke@435 | 2601 | return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); |
duke@435 | 2602 | } |
duke@435 | 2603 | } |
duke@435 | 2604 | |
duke@435 | 2605 | // report an object referencing an instance field object |
duke@435 | 2606 | inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { |
duke@435 | 2607 | if (is_basic_heap_walk()) { |
duke@435 | 2608 | return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); |
duke@435 | 2609 | } else { |
duke@435 | 2610 | return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); |
duke@435 | 2611 | } |
duke@435 | 2612 | } |
duke@435 | 2613 | |
duke@435 | 2614 | // report an array referencing an element object |
duke@435 | 2615 | inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { |
duke@435 | 2616 | if (is_basic_heap_walk()) { |
duke@435 | 2617 | return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); |
duke@435 | 2618 | } else { |
duke@435 | 2619 | return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); |
duke@435 | 2620 | } |
duke@435 | 2621 | } |
duke@435 | 2622 | |
duke@435 | 2623 | // A supporting closure used to process simple roots |
duke@435 | 2624 | class SimpleRootsClosure : public OopClosure { |
duke@435 | 2625 | private: |
duke@435 | 2626 | jvmtiHeapReferenceKind _kind; |
duke@435 | 2627 | bool _continue; |
duke@435 | 2628 | |
duke@435 | 2629 | jvmtiHeapReferenceKind root_kind() { return _kind; } |
duke@435 | 2630 | |
duke@435 | 2631 | public: |
duke@435 | 2632 | void set_kind(jvmtiHeapReferenceKind kind) { |
duke@435 | 2633 | _kind = kind; |
duke@435 | 2634 | _continue = true; |
duke@435 | 2635 | } |
duke@435 | 2636 | |
duke@435 | 2637 | inline bool stopped() { |
duke@435 | 2638 | return !_continue; |
duke@435 | 2639 | } |
duke@435 | 2640 | |
duke@435 | 2641 | void do_oop(oop* obj_p) { |
duke@435 | 2642 | // iteration has terminated |
duke@435 | 2643 | if (stopped()) { |
duke@435 | 2644 | return; |
duke@435 | 2645 | } |
duke@435 | 2646 | |
duke@435 | 2647 | // ignore null or deleted handles |
duke@435 | 2648 | oop o = *obj_p; |
duke@435 | 2649 | if (o == NULL || o == JNIHandles::deleted_handle()) { |
duke@435 | 2650 | return; |
duke@435 | 2651 | } |
duke@435 | 2652 | |
duke@435 | 2653 | jvmtiHeapReferenceKind kind = root_kind(); |
duke@435 | 2654 | |
duke@435 | 2655 | // many roots are Klasses so we use the java mirror |
duke@435 | 2656 | if (o->is_klass()) { |
duke@435 | 2657 | klassOop k = (klassOop)o; |
duke@435 | 2658 | o = Klass::cast(k)->java_mirror(); |
duke@435 | 2659 | } else { |
duke@435 | 2660 | |
duke@435 | 2661 | // SystemDictionary::always_strong_oops_do reports the application |
duke@435 | 2662 | // class loader as a root. We want this root to be reported as |
duke@435 | 2663 | // a root kind of "OTHER" rather than "SYSTEM_CLASS". |
duke@435 | 2664 | if (o->is_instance() && root_kind() == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { |
duke@435 | 2665 | kind = JVMTI_HEAP_REFERENCE_OTHER; |
duke@435 | 2666 | } |
duke@435 | 2667 | } |
duke@435 | 2668 | |
duke@435 | 2669 | // some objects are ignored - in the case of simple |
duke@435 | 2670 | // roots it's mostly symbolOops that we are skipping |
duke@435 | 2671 | // here. |
duke@435 | 2672 | if (!ServiceUtil::visible_oop(o)) { |
duke@435 | 2673 | return; |
duke@435 | 2674 | } |
duke@435 | 2675 | |
duke@435 | 2676 | // invoke the callback |
duke@435 | 2677 | _continue = CallbackInvoker::report_simple_root(kind, o); |
duke@435 | 2678 | |
duke@435 | 2679 | } |
coleenp@548 | 2680 | virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
duke@435 | 2681 | }; |
duke@435 | 2682 | |
duke@435 | 2683 | // A supporting closure used to process JNI locals |
duke@435 | 2684 | class JNILocalRootsClosure : public OopClosure { |
duke@435 | 2685 | private: |
duke@435 | 2686 | jlong _thread_tag; |
duke@435 | 2687 | jlong _tid; |
duke@435 | 2688 | jint _depth; |
duke@435 | 2689 | jmethodID _method; |
duke@435 | 2690 | bool _continue; |
duke@435 | 2691 | public: |
duke@435 | 2692 | void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { |
duke@435 | 2693 | _thread_tag = thread_tag; |
duke@435 | 2694 | _tid = tid; |
duke@435 | 2695 | _depth = depth; |
duke@435 | 2696 | _method = method; |
duke@435 | 2697 | _continue = true; |
duke@435 | 2698 | } |
duke@435 | 2699 | |
duke@435 | 2700 | inline bool stopped() { |
duke@435 | 2701 | return !_continue; |
duke@435 | 2702 | } |
duke@435 | 2703 | |
duke@435 | 2704 | void do_oop(oop* obj_p) { |
duke@435 | 2705 | // iteration has terminated |
duke@435 | 2706 | if (stopped()) { |
duke@435 | 2707 | return; |
duke@435 | 2708 | } |
duke@435 | 2709 | |
duke@435 | 2710 | // ignore null or deleted handles |
duke@435 | 2711 | oop o = *obj_p; |
duke@435 | 2712 | if (o == NULL || o == JNIHandles::deleted_handle()) { |
duke@435 | 2713 | return; |
duke@435 | 2714 | } |
duke@435 | 2715 | |
duke@435 | 2716 | if (!ServiceUtil::visible_oop(o)) { |
duke@435 | 2717 | return; |
duke@435 | 2718 | } |
duke@435 | 2719 | |
duke@435 | 2720 | // invoke the callback |
duke@435 | 2721 | _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); |
duke@435 | 2722 | } |
coleenp@548 | 2723 | virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
duke@435 | 2724 | }; |
duke@435 | 2725 | |
duke@435 | 2726 | |
duke@435 | 2727 | // A VM operation to iterate over objects that are reachable from |
duke@435 | 2728 | // a set of roots or an initial object. |
duke@435 | 2729 | // |
duke@435 | 2730 | // For VM_HeapWalkOperation the set of roots used is :- |
duke@435 | 2731 | // |
duke@435 | 2732 | // - All JNI global references |
duke@435 | 2733 | // - All inflated monitors |
duke@435 | 2734 | // - All classes loaded by the boot class loader (or all classes |
duke@435 | 2735 | // in the event that class unloading is disabled) |
duke@435 | 2736 | // - All java threads |
duke@435 | 2737 | // - For each java thread then all locals and JNI local references |
duke@435 | 2738 | // on the thread's execution stack |
duke@435 | 2739 | // - All visible/explainable objects from Universes::oops_do |
duke@435 | 2740 | // |
duke@435 | 2741 | class VM_HeapWalkOperation: public VM_Operation { |
duke@435 | 2742 | private: |
duke@435 | 2743 | enum { |
duke@435 | 2744 | initial_visit_stack_size = 4000 |
duke@435 | 2745 | }; |
duke@435 | 2746 | |
duke@435 | 2747 | bool _is_advanced_heap_walk; // indicates FollowReferences |
duke@435 | 2748 | JvmtiTagMap* _tag_map; |
duke@435 | 2749 | Handle _initial_object; |
duke@435 | 2750 | GrowableArray<oop>* _visit_stack; // the visit stack |
duke@435 | 2751 | |
duke@435 | 2752 | bool _collecting_heap_roots; // are we collecting roots |
duke@435 | 2753 | bool _following_object_refs; // are we following object references |
duke@435 | 2754 | |
duke@435 | 2755 | bool _reporting_primitive_fields; // optional reporting |
duke@435 | 2756 | bool _reporting_primitive_array_values; |
duke@435 | 2757 | bool _reporting_string_values; |
duke@435 | 2758 | |
duke@435 | 2759 | GrowableArray<oop>* create_visit_stack() { |
duke@435 | 2760 | return new (ResourceObj::C_HEAP) GrowableArray<oop>(initial_visit_stack_size, true); |
duke@435 | 2761 | } |
duke@435 | 2762 | |
duke@435 | 2763 | // accessors |
duke@435 | 2764 | bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } |
duke@435 | 2765 | JvmtiTagMap* tag_map() const { return _tag_map; } |
duke@435 | 2766 | Handle initial_object() const { return _initial_object; } |
duke@435 | 2767 | |
duke@435 | 2768 | bool is_following_references() const { return _following_object_refs; } |
duke@435 | 2769 | |
duke@435 | 2770 | bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } |
duke@435 | 2771 | bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } |
duke@435 | 2772 | bool is_reporting_string_values() const { return _reporting_string_values; } |
duke@435 | 2773 | |
duke@435 | 2774 | GrowableArray<oop>* visit_stack() const { return _visit_stack; } |
duke@435 | 2775 | |
duke@435 | 2776 | // iterate over the various object types |
duke@435 | 2777 | inline bool iterate_over_array(oop o); |
duke@435 | 2778 | inline bool iterate_over_type_array(oop o); |
duke@435 | 2779 | inline bool iterate_over_class(klassOop o); |
duke@435 | 2780 | inline bool iterate_over_object(oop o); |
duke@435 | 2781 | |
duke@435 | 2782 | // root collection |
duke@435 | 2783 | inline bool collect_simple_roots(); |
duke@435 | 2784 | inline bool collect_stack_roots(); |
duke@435 | 2785 | inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); |
duke@435 | 2786 | |
duke@435 | 2787 | // visit an object |
duke@435 | 2788 | inline bool visit(oop o); |
duke@435 | 2789 | |
duke@435 | 2790 | public: |
duke@435 | 2791 | VM_HeapWalkOperation(JvmtiTagMap* tag_map, |
duke@435 | 2792 | Handle initial_object, |
duke@435 | 2793 | BasicHeapWalkContext callbacks, |
duke@435 | 2794 | const void* user_data); |
duke@435 | 2795 | |
duke@435 | 2796 | VM_HeapWalkOperation(JvmtiTagMap* tag_map, |
duke@435 | 2797 | Handle initial_object, |
duke@435 | 2798 | AdvancedHeapWalkContext callbacks, |
duke@435 | 2799 | const void* user_data); |
duke@435 | 2800 | |
duke@435 | 2801 | ~VM_HeapWalkOperation(); |
duke@435 | 2802 | |
duke@435 | 2803 | VMOp_Type type() const { return VMOp_HeapWalkOperation; } |
duke@435 | 2804 | void doit(); |
duke@435 | 2805 | }; |
duke@435 | 2806 | |
duke@435 | 2807 | |
duke@435 | 2808 | VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, |
duke@435 | 2809 | Handle initial_object, |
duke@435 | 2810 | BasicHeapWalkContext callbacks, |
duke@435 | 2811 | const void* user_data) { |
duke@435 | 2812 | _is_advanced_heap_walk = false; |
duke@435 | 2813 | _tag_map = tag_map; |
duke@435 | 2814 | _initial_object = initial_object; |
duke@435 | 2815 | _following_object_refs = (callbacks.object_ref_callback() != NULL); |
duke@435 | 2816 | _reporting_primitive_fields = false; |
duke@435 | 2817 | _reporting_primitive_array_values = false; |
duke@435 | 2818 | _reporting_string_values = false; |
duke@435 | 2819 | _visit_stack = create_visit_stack(); |
duke@435 | 2820 | |
duke@435 | 2821 | |
duke@435 | 2822 | CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); |
duke@435 | 2823 | } |
duke@435 | 2824 | |
duke@435 | 2825 | VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, |
duke@435 | 2826 | Handle initial_object, |
duke@435 | 2827 | AdvancedHeapWalkContext callbacks, |
duke@435 | 2828 | const void* user_data) { |
duke@435 | 2829 | _is_advanced_heap_walk = true; |
duke@435 | 2830 | _tag_map = tag_map; |
duke@435 | 2831 | _initial_object = initial_object; |
duke@435 | 2832 | _following_object_refs = true; |
duke@435 | 2833 | _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; |
duke@435 | 2834 | _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; |
duke@435 | 2835 | _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; |
duke@435 | 2836 | _visit_stack = create_visit_stack(); |
duke@435 | 2837 | |
duke@435 | 2838 | CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); |
duke@435 | 2839 | } |
duke@435 | 2840 | |
duke@435 | 2841 | VM_HeapWalkOperation::~VM_HeapWalkOperation() { |
duke@435 | 2842 | if (_following_object_refs) { |
duke@435 | 2843 | assert(_visit_stack != NULL, "checking"); |
duke@435 | 2844 | delete _visit_stack; |
duke@435 | 2845 | _visit_stack = NULL; |
duke@435 | 2846 | } |
duke@435 | 2847 | } |
duke@435 | 2848 | |
duke@435 | 2849 | // an array references its class and has a reference to |
duke@435 | 2850 | // each element in the array |
duke@435 | 2851 | inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { |
duke@435 | 2852 | objArrayOop array = objArrayOop(o); |
duke@435 | 2853 | if (array->klass() == Universe::systemObjArrayKlassObj()) { |
duke@435 | 2854 | // filtered out |
duke@435 | 2855 | return true; |
duke@435 | 2856 | } |
duke@435 | 2857 | |
duke@435 | 2858 | // array reference to its class |
duke@435 | 2859 | oop mirror = objArrayKlass::cast(array->klass())->java_mirror(); |
duke@435 | 2860 | if (!CallbackInvoker::report_class_reference(o, mirror)) { |
duke@435 | 2861 | return false; |
duke@435 | 2862 | } |
duke@435 | 2863 | |
duke@435 | 2864 | // iterate over the array and report each reference to a |
duke@435 | 2865 | // non-null element |
duke@435 | 2866 | for (int index=0; index<array->length(); index++) { |
duke@435 | 2867 | oop elem = array->obj_at(index); |
duke@435 | 2868 | if (elem == NULL) { |
duke@435 | 2869 | continue; |
duke@435 | 2870 | } |
duke@435 | 2871 | |
duke@435 | 2872 | // report the array reference o[index] = elem |
duke@435 | 2873 | if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { |
duke@435 | 2874 | return false; |
duke@435 | 2875 | } |
duke@435 | 2876 | } |
duke@435 | 2877 | return true; |
duke@435 | 2878 | } |
duke@435 | 2879 | |
duke@435 | 2880 | // a type array references its class |
duke@435 | 2881 | inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { |
duke@435 | 2882 | klassOop k = o->klass(); |
duke@435 | 2883 | oop mirror = Klass::cast(k)->java_mirror(); |
duke@435 | 2884 | if (!CallbackInvoker::report_class_reference(o, mirror)) { |
duke@435 | 2885 | return false; |
duke@435 | 2886 | } |
duke@435 | 2887 | |
duke@435 | 2888 | // report the array contents if required |
duke@435 | 2889 | if (is_reporting_primitive_array_values()) { |
duke@435 | 2890 | if (!CallbackInvoker::report_primitive_array_values(o)) { |
duke@435 | 2891 | return false; |
duke@435 | 2892 | } |
duke@435 | 2893 | } |
duke@435 | 2894 | return true; |
duke@435 | 2895 | } |
duke@435 | 2896 | |
duke@435 | 2897 | // verify that a static oop field is in range |
coleenp@548 | 2898 | static inline bool verify_static_oop(instanceKlass* ik, |
coleenp@548 | 2899 | klassOop k, int offset) { |
coleenp@548 | 2900 | address obj_p = (address)k + offset; |
coleenp@548 | 2901 | address start = (address)ik->start_of_static_fields(); |
coleenp@548 | 2902 | address end = start + (ik->static_oop_field_size() * heapOopSize); |
duke@435 | 2903 | assert(end >= start, "sanity check"); |
duke@435 | 2904 | |
duke@435 | 2905 | if (obj_p >= start && obj_p < end) { |
duke@435 | 2906 | return true; |
duke@435 | 2907 | } else { |
duke@435 | 2908 | return false; |
duke@435 | 2909 | } |
duke@435 | 2910 | } |
duke@435 | 2911 | |
duke@435 | 2912 | // a class references its super class, interfaces, class loader, ... |
duke@435 | 2913 | // and finally its static fields |
duke@435 | 2914 | inline bool VM_HeapWalkOperation::iterate_over_class(klassOop k) { |
duke@435 | 2915 | int i; |
duke@435 | 2916 | Klass* klass = klassOop(k)->klass_part(); |
duke@435 | 2917 | |
duke@435 | 2918 | if (klass->oop_is_instance()) { |
duke@435 | 2919 | instanceKlass* ik = instanceKlass::cast(k); |
duke@435 | 2920 | |
duke@435 | 2921 | // ignore the class if it's has been initialized yet |
duke@435 | 2922 | if (!ik->is_linked()) { |
duke@435 | 2923 | return true; |
duke@435 | 2924 | } |
duke@435 | 2925 | |
duke@435 | 2926 | // get the java mirror |
duke@435 | 2927 | oop mirror = klass->java_mirror(); |
duke@435 | 2928 | |
duke@435 | 2929 | // super (only if something more interesting than java.lang.Object) |
duke@435 | 2930 | klassOop java_super = ik->java_super(); |
duke@435 | 2931 | if (java_super != NULL && java_super != SystemDictionary::object_klass()) { |
duke@435 | 2932 | oop super = Klass::cast(java_super)->java_mirror(); |
duke@435 | 2933 | if (!CallbackInvoker::report_superclass_reference(mirror, super)) { |
duke@435 | 2934 | return false; |
duke@435 | 2935 | } |
duke@435 | 2936 | } |
duke@435 | 2937 | |
duke@435 | 2938 | // class loader |
duke@435 | 2939 | oop cl = ik->class_loader(); |
duke@435 | 2940 | if (cl != NULL) { |
duke@435 | 2941 | if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { |
duke@435 | 2942 | return false; |
duke@435 | 2943 | } |
duke@435 | 2944 | } |
duke@435 | 2945 | |
duke@435 | 2946 | // protection domain |
duke@435 | 2947 | oop pd = ik->protection_domain(); |
duke@435 | 2948 | if (pd != NULL) { |
duke@435 | 2949 | if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { |
duke@435 | 2950 | return false; |
duke@435 | 2951 | } |
duke@435 | 2952 | } |
duke@435 | 2953 | |
duke@435 | 2954 | // signers |
duke@435 | 2955 | oop signers = ik->signers(); |
duke@435 | 2956 | if (signers != NULL) { |
duke@435 | 2957 | if (!CallbackInvoker::report_signers_reference(mirror, signers)) { |
duke@435 | 2958 | return false; |
duke@435 | 2959 | } |
duke@435 | 2960 | } |
duke@435 | 2961 | |
duke@435 | 2962 | // references from the constant pool |
duke@435 | 2963 | { |
duke@435 | 2964 | const constantPoolOop pool = ik->constants(); |
duke@435 | 2965 | for (int i = 1; i < pool->length(); i++) { |
duke@435 | 2966 | constantTag tag = pool->tag_at(i).value(); |
duke@435 | 2967 | if (tag.is_string() || tag.is_klass()) { |
duke@435 | 2968 | oop entry; |
duke@435 | 2969 | if (tag.is_string()) { |
duke@435 | 2970 | entry = pool->resolved_string_at(i); |
duke@435 | 2971 | assert(java_lang_String::is_instance(entry), "must be string"); |
duke@435 | 2972 | } else { |
duke@435 | 2973 | entry = Klass::cast(pool->resolved_klass_at(i))->java_mirror(); |
duke@435 | 2974 | } |
duke@435 | 2975 | if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { |
duke@435 | 2976 | return false; |
duke@435 | 2977 | } |
duke@435 | 2978 | } |
duke@435 | 2979 | } |
duke@435 | 2980 | } |
duke@435 | 2981 | |
duke@435 | 2982 | // interfaces |
duke@435 | 2983 | // (These will already have been reported as references from the constant pool |
duke@435 | 2984 | // but are specified by IterateOverReachableObjects and must be reported). |
duke@435 | 2985 | objArrayOop interfaces = ik->local_interfaces(); |
duke@435 | 2986 | for (i = 0; i < interfaces->length(); i++) { |
duke@435 | 2987 | oop interf = Klass::cast((klassOop)interfaces->obj_at(i))->java_mirror(); |
duke@435 | 2988 | if (interf == NULL) { |
duke@435 | 2989 | continue; |
duke@435 | 2990 | } |
duke@435 | 2991 | if (!CallbackInvoker::report_interface_reference(mirror, interf)) { |
duke@435 | 2992 | return false; |
duke@435 | 2993 | } |
duke@435 | 2994 | } |
duke@435 | 2995 | |
duke@435 | 2996 | // iterate over the static fields |
duke@435 | 2997 | |
duke@435 | 2998 | ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); |
duke@435 | 2999 | for (i=0; i<field_map->field_count(); i++) { |
duke@435 | 3000 | ClassFieldDescriptor* field = field_map->field_at(i); |
duke@435 | 3001 | char type = field->field_type(); |
duke@435 | 3002 | if (!is_primitive_field_type(type)) { |
coleenp@548 | 3003 | oop fld_o = k->obj_field(field->field_offset()); |
coleenp@548 | 3004 | assert(verify_static_oop(ik, k, field->field_offset()), "sanity check"); |
duke@435 | 3005 | if (fld_o != NULL) { |
duke@435 | 3006 | int slot = field->field_index(); |
duke@435 | 3007 | if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { |
duke@435 | 3008 | delete field_map; |
duke@435 | 3009 | return false; |
duke@435 | 3010 | } |
duke@435 | 3011 | } |
duke@435 | 3012 | } else { |
duke@435 | 3013 | if (is_reporting_primitive_fields()) { |
duke@435 | 3014 | address addr = (address)k + field->field_offset(); |
duke@435 | 3015 | int slot = field->field_index(); |
duke@435 | 3016 | if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { |
duke@435 | 3017 | delete field_map; |
duke@435 | 3018 | return false; |
duke@435 | 3019 | } |
duke@435 | 3020 | } |
duke@435 | 3021 | } |
duke@435 | 3022 | } |
duke@435 | 3023 | delete field_map; |
duke@435 | 3024 | |
duke@435 | 3025 | return true; |
duke@435 | 3026 | } |
duke@435 | 3027 | |
duke@435 | 3028 | return true; |
duke@435 | 3029 | } |
duke@435 | 3030 | |
duke@435 | 3031 | // an object references a class and its instance fields |
duke@435 | 3032 | // (static fields are ignored here as we report these as |
duke@435 | 3033 | // references from the class). |
duke@435 | 3034 | inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { |
duke@435 | 3035 | // reference to the class |
duke@435 | 3036 | if (!CallbackInvoker::report_class_reference(o, Klass::cast(o->klass())->java_mirror())) { |
duke@435 | 3037 | return false; |
duke@435 | 3038 | } |
duke@435 | 3039 | |
duke@435 | 3040 | // iterate over instance fields |
duke@435 | 3041 | ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); |
duke@435 | 3042 | for (int i=0; i<field_map->field_count(); i++) { |
duke@435 | 3043 | ClassFieldDescriptor* field = field_map->field_at(i); |
duke@435 | 3044 | char type = field->field_type(); |
duke@435 | 3045 | if (!is_primitive_field_type(type)) { |
coleenp@548 | 3046 | oop fld_o = o->obj_field(field->field_offset()); |
duke@435 | 3047 | if (fld_o != NULL) { |
duke@435 | 3048 | // reflection code may have a reference to a klassOop. |
duke@435 | 3049 | // - see sun.reflect.UnsafeStaticFieldAccessorImpl and sun.misc.Unsafe |
duke@435 | 3050 | if (fld_o->is_klass()) { |
duke@435 | 3051 | klassOop k = (klassOop)fld_o; |
duke@435 | 3052 | fld_o = Klass::cast(k)->java_mirror(); |
duke@435 | 3053 | } |
duke@435 | 3054 | int slot = field->field_index(); |
duke@435 | 3055 | if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { |
duke@435 | 3056 | return false; |
duke@435 | 3057 | } |
duke@435 | 3058 | } |
duke@435 | 3059 | } else { |
duke@435 | 3060 | if (is_reporting_primitive_fields()) { |
duke@435 | 3061 | // primitive instance field |
duke@435 | 3062 | address addr = (address)o + field->field_offset(); |
duke@435 | 3063 | int slot = field->field_index(); |
duke@435 | 3064 | if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { |
duke@435 | 3065 | return false; |
duke@435 | 3066 | } |
duke@435 | 3067 | } |
duke@435 | 3068 | } |
duke@435 | 3069 | } |
duke@435 | 3070 | |
duke@435 | 3071 | // if the object is a java.lang.String |
duke@435 | 3072 | if (is_reporting_string_values() && |
duke@435 | 3073 | o->klass() == SystemDictionary::string_klass()) { |
duke@435 | 3074 | if (!CallbackInvoker::report_string_value(o)) { |
duke@435 | 3075 | return false; |
duke@435 | 3076 | } |
duke@435 | 3077 | } |
duke@435 | 3078 | return true; |
duke@435 | 3079 | } |
duke@435 | 3080 | |
duke@435 | 3081 | |
duke@435 | 3082 | // collects all simple (non-stack) roots. |
duke@435 | 3083 | // if there's a heap root callback provided then the callback is |
duke@435 | 3084 | // invoked for each simple root. |
duke@435 | 3085 | // if an object reference callback is provided then all simple |
duke@435 | 3086 | // roots are pushed onto the marking stack so that they can be |
duke@435 | 3087 | // processed later |
duke@435 | 3088 | // |
duke@435 | 3089 | inline bool VM_HeapWalkOperation::collect_simple_roots() { |
duke@435 | 3090 | SimpleRootsClosure blk; |
duke@435 | 3091 | |
duke@435 | 3092 | // JNI globals |
duke@435 | 3093 | blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); |
duke@435 | 3094 | JNIHandles::oops_do(&blk); |
duke@435 | 3095 | if (blk.stopped()) { |
duke@435 | 3096 | return false; |
duke@435 | 3097 | } |
duke@435 | 3098 | |
duke@435 | 3099 | // Preloaded classes and loader from the system dictionary |
duke@435 | 3100 | blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); |
duke@435 | 3101 | SystemDictionary::always_strong_oops_do(&blk); |
duke@435 | 3102 | if (blk.stopped()) { |
duke@435 | 3103 | return false; |
duke@435 | 3104 | } |
duke@435 | 3105 | |
duke@435 | 3106 | // Inflated monitors |
duke@435 | 3107 | blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); |
duke@435 | 3108 | ObjectSynchronizer::oops_do(&blk); |
duke@435 | 3109 | if (blk.stopped()) { |
duke@435 | 3110 | return false; |
duke@435 | 3111 | } |
duke@435 | 3112 | |
duke@435 | 3113 | // Threads |
duke@435 | 3114 | for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { |
duke@435 | 3115 | oop threadObj = thread->threadObj(); |
duke@435 | 3116 | if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { |
duke@435 | 3117 | bool cont = CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, threadObj); |
duke@435 | 3118 | if (!cont) { |
duke@435 | 3119 | return false; |
duke@435 | 3120 | } |
duke@435 | 3121 | } |
duke@435 | 3122 | } |
duke@435 | 3123 | |
duke@435 | 3124 | // Other kinds of roots maintained by HotSpot |
duke@435 | 3125 | // Many of these won't be visible but others (such as instances of important |
duke@435 | 3126 | // exceptions) will be visible. |
duke@435 | 3127 | blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
duke@435 | 3128 | Universe::oops_do(&blk); |
duke@435 | 3129 | return true; |
duke@435 | 3130 | } |
duke@435 | 3131 | |
duke@435 | 3132 | // Walk the stack of a given thread and find all references (locals |
duke@435 | 3133 | // and JNI calls) and report these as stack references |
duke@435 | 3134 | inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, |
duke@435 | 3135 | JNILocalRootsClosure* blk) |
duke@435 | 3136 | { |
duke@435 | 3137 | oop threadObj = java_thread->threadObj(); |
duke@435 | 3138 | assert(threadObj != NULL, "sanity check"); |
duke@435 | 3139 | |
duke@435 | 3140 | // only need to get the thread's tag once per thread |
duke@435 | 3141 | jlong thread_tag = tag_for(_tag_map, threadObj); |
duke@435 | 3142 | |
duke@435 | 3143 | // also need the thread id |
duke@435 | 3144 | jlong tid = java_lang_Thread::thread_id(threadObj); |
duke@435 | 3145 | |
duke@435 | 3146 | |
duke@435 | 3147 | if (java_thread->has_last_Java_frame()) { |
duke@435 | 3148 | |
duke@435 | 3149 | // vframes are resource allocated |
duke@435 | 3150 | Thread* current_thread = Thread::current(); |
duke@435 | 3151 | ResourceMark rm(current_thread); |
duke@435 | 3152 | HandleMark hm(current_thread); |
duke@435 | 3153 | |
duke@435 | 3154 | RegisterMap reg_map(java_thread); |
duke@435 | 3155 | frame f = java_thread->last_frame(); |
duke@435 | 3156 | vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); |
duke@435 | 3157 | |
duke@435 | 3158 | bool is_top_frame = true; |
duke@435 | 3159 | int depth = 0; |
duke@435 | 3160 | frame* last_entry_frame = NULL; |
duke@435 | 3161 | |
duke@435 | 3162 | while (vf != NULL) { |
duke@435 | 3163 | if (vf->is_java_frame()) { |
duke@435 | 3164 | |
duke@435 | 3165 | // java frame (interpreted, compiled, ...) |
duke@435 | 3166 | javaVFrame *jvf = javaVFrame::cast(vf); |
duke@435 | 3167 | |
duke@435 | 3168 | // the jmethodID |
duke@435 | 3169 | jmethodID method = jvf->method()->jmethod_id(); |
duke@435 | 3170 | |
duke@435 | 3171 | if (!(jvf->method()->is_native())) { |
duke@435 | 3172 | jlocation bci = (jlocation)jvf->bci(); |
duke@435 | 3173 | StackValueCollection* locals = jvf->locals(); |
duke@435 | 3174 | for (int slot=0; slot<locals->size(); slot++) { |
duke@435 | 3175 | if (locals->at(slot)->type() == T_OBJECT) { |
duke@435 | 3176 | oop o = locals->obj_at(slot)(); |
duke@435 | 3177 | if (o == NULL) { |
duke@435 | 3178 | continue; |
duke@435 | 3179 | } |
duke@435 | 3180 | |
duke@435 | 3181 | // stack reference |
duke@435 | 3182 | if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, |
duke@435 | 3183 | bci, slot, o)) { |
duke@435 | 3184 | return false; |
duke@435 | 3185 | } |
duke@435 | 3186 | } |
duke@435 | 3187 | } |
duke@435 | 3188 | } else { |
duke@435 | 3189 | blk->set_context(thread_tag, tid, depth, method); |
duke@435 | 3190 | if (is_top_frame) { |
duke@435 | 3191 | // JNI locals for the top frame. |
duke@435 | 3192 | java_thread->active_handles()->oops_do(blk); |
duke@435 | 3193 | } else { |
duke@435 | 3194 | if (last_entry_frame != NULL) { |
duke@435 | 3195 | // JNI locals for the entry frame |
duke@435 | 3196 | assert(last_entry_frame->is_entry_frame(), "checking"); |
duke@435 | 3197 | last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); |
duke@435 | 3198 | } |
duke@435 | 3199 | } |
duke@435 | 3200 | } |
duke@435 | 3201 | last_entry_frame = NULL; |
duke@435 | 3202 | depth++; |
duke@435 | 3203 | } else { |
duke@435 | 3204 | // externalVFrame - for an entry frame then we report the JNI locals |
duke@435 | 3205 | // when we find the corresponding javaVFrame |
duke@435 | 3206 | frame* fr = vf->frame_pointer(); |
duke@435 | 3207 | assert(fr != NULL, "sanity check"); |
duke@435 | 3208 | if (fr->is_entry_frame()) { |
duke@435 | 3209 | last_entry_frame = fr; |
duke@435 | 3210 | } |
duke@435 | 3211 | } |
duke@435 | 3212 | |
duke@435 | 3213 | vf = vf->sender(); |
duke@435 | 3214 | is_top_frame = false; |
duke@435 | 3215 | } |
duke@435 | 3216 | } else { |
duke@435 | 3217 | // no last java frame but there may be JNI locals |
duke@435 | 3218 | blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); |
duke@435 | 3219 | java_thread->active_handles()->oops_do(blk); |
duke@435 | 3220 | } |
duke@435 | 3221 | return true; |
duke@435 | 3222 | } |
duke@435 | 3223 | |
duke@435 | 3224 | |
duke@435 | 3225 | // collects all stack roots - for each thread it walks the execution |
duke@435 | 3226 | // stack to find all references and local JNI refs. |
duke@435 | 3227 | inline bool VM_HeapWalkOperation::collect_stack_roots() { |
duke@435 | 3228 | JNILocalRootsClosure blk; |
duke@435 | 3229 | for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { |
duke@435 | 3230 | oop threadObj = thread->threadObj(); |
duke@435 | 3231 | if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { |
duke@435 | 3232 | if (!collect_stack_roots(thread, &blk)) { |
duke@435 | 3233 | return false; |
duke@435 | 3234 | } |
duke@435 | 3235 | } |
duke@435 | 3236 | } |
duke@435 | 3237 | return true; |
duke@435 | 3238 | } |
duke@435 | 3239 | |
duke@435 | 3240 | // visit an object |
duke@435 | 3241 | // first mark the object as visited |
duke@435 | 3242 | // second get all the outbound references from this object (in other words, all |
duke@435 | 3243 | // the objects referenced by this object). |
duke@435 | 3244 | // |
duke@435 | 3245 | bool VM_HeapWalkOperation::visit(oop o) { |
duke@435 | 3246 | // mark object as visited |
duke@435 | 3247 | assert(!ObjectMarker::visited(o), "can't visit same object more than once"); |
duke@435 | 3248 | ObjectMarker::mark(o); |
duke@435 | 3249 | |
duke@435 | 3250 | // instance |
duke@435 | 3251 | if (o->is_instance()) { |
duke@435 | 3252 | if (o->klass() == SystemDictionary::class_klass()) { |
duke@435 | 3253 | o = klassOop_if_java_lang_Class(o); |
duke@435 | 3254 | if (o->is_klass()) { |
duke@435 | 3255 | // a java.lang.Class |
duke@435 | 3256 | return iterate_over_class(klassOop(o)); |
duke@435 | 3257 | } |
duke@435 | 3258 | } else { |
duke@435 | 3259 | return iterate_over_object(o); |
duke@435 | 3260 | } |
duke@435 | 3261 | } |
duke@435 | 3262 | |
duke@435 | 3263 | // object array |
duke@435 | 3264 | if (o->is_objArray()) { |
duke@435 | 3265 | return iterate_over_array(o); |
duke@435 | 3266 | } |
duke@435 | 3267 | |
duke@435 | 3268 | // type array |
duke@435 | 3269 | if (o->is_typeArray()) { |
duke@435 | 3270 | return iterate_over_type_array(o); |
duke@435 | 3271 | } |
duke@435 | 3272 | |
duke@435 | 3273 | return true; |
duke@435 | 3274 | } |
duke@435 | 3275 | |
duke@435 | 3276 | void VM_HeapWalkOperation::doit() { |
duke@435 | 3277 | ResourceMark rm; |
duke@435 | 3278 | ObjectMarkerController marker; |
duke@435 | 3279 | ClassFieldMapCacheMark cm; |
duke@435 | 3280 | |
duke@435 | 3281 | assert(visit_stack()->is_empty(), "visit stack must be empty"); |
duke@435 | 3282 | |
duke@435 | 3283 | // the heap walk starts with an initial object or the heap roots |
duke@435 | 3284 | if (initial_object().is_null()) { |
duke@435 | 3285 | if (!collect_simple_roots()) return; |
duke@435 | 3286 | if (!collect_stack_roots()) return; |
duke@435 | 3287 | } else { |
duke@435 | 3288 | visit_stack()->push(initial_object()()); |
duke@435 | 3289 | } |
duke@435 | 3290 | |
duke@435 | 3291 | // object references required |
duke@435 | 3292 | if (is_following_references()) { |
duke@435 | 3293 | |
duke@435 | 3294 | // visit each object until all reachable objects have been |
duke@435 | 3295 | // visited or the callback asked to terminate the iteration. |
duke@435 | 3296 | while (!visit_stack()->is_empty()) { |
duke@435 | 3297 | oop o = visit_stack()->pop(); |
duke@435 | 3298 | if (!ObjectMarker::visited(o)) { |
duke@435 | 3299 | if (!visit(o)) { |
duke@435 | 3300 | break; |
duke@435 | 3301 | } |
duke@435 | 3302 | } |
duke@435 | 3303 | } |
duke@435 | 3304 | } |
duke@435 | 3305 | } |
duke@435 | 3306 | |
duke@435 | 3307 | // iterate over all objects that are reachable from a set of roots |
duke@435 | 3308 | void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, |
duke@435 | 3309 | jvmtiStackReferenceCallback stack_ref_callback, |
duke@435 | 3310 | jvmtiObjectReferenceCallback object_ref_callback, |
duke@435 | 3311 | const void* user_data) { |
duke@435 | 3312 | MutexLocker ml(Heap_lock); |
duke@435 | 3313 | BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); |
duke@435 | 3314 | VM_HeapWalkOperation op(this, Handle(), context, user_data); |
duke@435 | 3315 | VMThread::execute(&op); |
duke@435 | 3316 | } |
duke@435 | 3317 | |
duke@435 | 3318 | // iterate over all objects that are reachable from a given object |
duke@435 | 3319 | void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, |
duke@435 | 3320 | jvmtiObjectReferenceCallback object_ref_callback, |
duke@435 | 3321 | const void* user_data) { |
duke@435 | 3322 | oop obj = JNIHandles::resolve(object); |
duke@435 | 3323 | Handle initial_object(Thread::current(), obj); |
duke@435 | 3324 | |
duke@435 | 3325 | MutexLocker ml(Heap_lock); |
duke@435 | 3326 | BasicHeapWalkContext context(NULL, NULL, object_ref_callback); |
duke@435 | 3327 | VM_HeapWalkOperation op(this, initial_object, context, user_data); |
duke@435 | 3328 | VMThread::execute(&op); |
duke@435 | 3329 | } |
duke@435 | 3330 | |
duke@435 | 3331 | // follow references from an initial object or the GC roots |
duke@435 | 3332 | void JvmtiTagMap::follow_references(jint heap_filter, |
duke@435 | 3333 | KlassHandle klass, |
duke@435 | 3334 | jobject object, |
duke@435 | 3335 | const jvmtiHeapCallbacks* callbacks, |
duke@435 | 3336 | const void* user_data) |
duke@435 | 3337 | { |
duke@435 | 3338 | oop obj = JNIHandles::resolve(object); |
duke@435 | 3339 | Handle initial_object(Thread::current(), obj); |
duke@435 | 3340 | |
duke@435 | 3341 | MutexLocker ml(Heap_lock); |
duke@435 | 3342 | AdvancedHeapWalkContext context(heap_filter, klass, callbacks); |
duke@435 | 3343 | VM_HeapWalkOperation op(this, initial_object, context, user_data); |
duke@435 | 3344 | VMThread::execute(&op); |
duke@435 | 3345 | } |
duke@435 | 3346 | |
duke@435 | 3347 | |
duke@435 | 3348 | // called post-GC |
duke@435 | 3349 | // - for each JVMTI environment with an object tag map, call its rehash |
duke@435 | 3350 | // function to re-sync with the new object locations. |
duke@435 | 3351 | void JvmtiTagMap::gc_epilogue(bool full) { |
duke@435 | 3352 | assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint"); |
duke@435 | 3353 | if (JvmtiEnv::environments_might_exist()) { |
duke@435 | 3354 | // re-obtain the memory region for the young generation (might |
duke@435 | 3355 | // changed due to adaptive resizing policy) |
duke@435 | 3356 | get_young_generation(); |
duke@435 | 3357 | |
duke@435 | 3358 | JvmtiEnvIterator it; |
duke@435 | 3359 | for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { |
duke@435 | 3360 | JvmtiTagMap* tag_map = env->tag_map(); |
duke@435 | 3361 | if (tag_map != NULL && !tag_map->is_empty()) { |
duke@435 | 3362 | TraceTime t(full ? "JVMTI Full Rehash " : "JVMTI Rehash ", TraceJVMTIObjectTagging); |
duke@435 | 3363 | if (full) { |
duke@435 | 3364 | tag_map->rehash(0, n_hashmaps); |
duke@435 | 3365 | } else { |
duke@435 | 3366 | tag_map->rehash(0, 0); // tag map for young gen only |
duke@435 | 3367 | } |
duke@435 | 3368 | } |
duke@435 | 3369 | } |
duke@435 | 3370 | } |
duke@435 | 3371 | } |
duke@435 | 3372 | |
duke@435 | 3373 | // CMS has completed referencing processing so we may have JNI weak refs |
duke@435 | 3374 | // to objects in the CMS generation that have been GC'ed. |
duke@435 | 3375 | void JvmtiTagMap::cms_ref_processing_epilogue() { |
duke@435 | 3376 | assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint"); |
duke@435 | 3377 | assert(UseConcMarkSweepGC, "should only be used with CMS"); |
duke@435 | 3378 | if (JvmtiEnv::environments_might_exist()) { |
duke@435 | 3379 | JvmtiEnvIterator it; |
duke@435 | 3380 | for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { |
duke@435 | 3381 | JvmtiTagMap* tag_map = ((JvmtiEnvBase *)env)->tag_map(); |
duke@435 | 3382 | if (tag_map != NULL && !tag_map->is_empty()) { |
duke@435 | 3383 | TraceTime t("JVMTI Rehash (CMS) ", TraceJVMTIObjectTagging); |
duke@435 | 3384 | tag_map->rehash(1, n_hashmaps); // assume CMS not used in young gen |
duke@435 | 3385 | } |
duke@435 | 3386 | } |
duke@435 | 3387 | } |
duke@435 | 3388 | } |
duke@435 | 3389 | |
duke@435 | 3390 | |
duke@435 | 3391 | // For each entry in the hashmaps 'start' to 'end' : |
duke@435 | 3392 | // |
duke@435 | 3393 | // 1. resolve the JNI weak reference |
duke@435 | 3394 | // |
duke@435 | 3395 | // 2. If it resolves to NULL it means the object has been freed so the entry |
duke@435 | 3396 | // is removed, the weak reference destroyed, and the object free event is |
duke@435 | 3397 | // posted (if enabled). |
duke@435 | 3398 | // |
duke@435 | 3399 | // 3. If the weak reference resolves to an object then we re-hash the object |
duke@435 | 3400 | // to see if it has moved or has been promoted (from the young to the old |
duke@435 | 3401 | // generation for example). |
duke@435 | 3402 | // |
duke@435 | 3403 | void JvmtiTagMap::rehash(int start, int end) { |
duke@435 | 3404 | |
duke@435 | 3405 | // does this environment have the OBJECT_FREE event enabled |
duke@435 | 3406 | bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); |
duke@435 | 3407 | |
duke@435 | 3408 | // counters used for trace message |
duke@435 | 3409 | int freed = 0; |
duke@435 | 3410 | int moved = 0; |
duke@435 | 3411 | int promoted = 0; |
duke@435 | 3412 | |
duke@435 | 3413 | // we assume there are two hashmaps - one for the young generation |
duke@435 | 3414 | // and the other for all other spaces. |
duke@435 | 3415 | assert(n_hashmaps == 2, "not implemented"); |
duke@435 | 3416 | JvmtiTagHashmap* young_hashmap = _hashmap[0]; |
duke@435 | 3417 | JvmtiTagHashmap* other_hashmap = _hashmap[1]; |
duke@435 | 3418 | |
duke@435 | 3419 | // reenable sizing (if disabled) |
duke@435 | 3420 | young_hashmap->set_resizing_enabled(true); |
duke@435 | 3421 | other_hashmap->set_resizing_enabled(true); |
duke@435 | 3422 | |
duke@435 | 3423 | // when re-hashing the hashmap corresponding to the young generation we |
duke@435 | 3424 | // collect the entries corresponding to objects that have been promoted. |
duke@435 | 3425 | JvmtiTagHashmapEntry* promoted_entries = NULL; |
duke@435 | 3426 | |
duke@435 | 3427 | if (end >= n_hashmaps) { |
duke@435 | 3428 | end = n_hashmaps - 1; |
duke@435 | 3429 | } |
duke@435 | 3430 | |
duke@435 | 3431 | for (int i=start; i <= end; i++) { |
duke@435 | 3432 | JvmtiTagHashmap* hashmap = _hashmap[i]; |
duke@435 | 3433 | |
duke@435 | 3434 | // if the hashmap is empty then we can skip it |
duke@435 | 3435 | if (hashmap->_entry_count == 0) { |
duke@435 | 3436 | continue; |
duke@435 | 3437 | } |
duke@435 | 3438 | |
duke@435 | 3439 | // now iterate through each entry in the table |
duke@435 | 3440 | |
duke@435 | 3441 | JvmtiTagHashmapEntry** table = hashmap->table(); |
duke@435 | 3442 | int size = hashmap->size(); |
duke@435 | 3443 | |
duke@435 | 3444 | for (int pos=0; pos<size; pos++) { |
duke@435 | 3445 | JvmtiTagHashmapEntry* entry = table[pos]; |
duke@435 | 3446 | JvmtiTagHashmapEntry* prev = NULL; |
duke@435 | 3447 | |
duke@435 | 3448 | while (entry != NULL) { |
duke@435 | 3449 | JvmtiTagHashmapEntry* next = entry->next(); |
duke@435 | 3450 | |
duke@435 | 3451 | jweak ref = entry->object(); |
duke@435 | 3452 | oop oop = JNIHandles::resolve(ref); |
duke@435 | 3453 | |
duke@435 | 3454 | // has object been GC'ed |
duke@435 | 3455 | if (oop == NULL) { |
duke@435 | 3456 | // grab the tag |
duke@435 | 3457 | jlong tag = entry->tag(); |
duke@435 | 3458 | guarantee(tag != 0, "checking"); |
duke@435 | 3459 | |
duke@435 | 3460 | // remove GC'ed entry from hashmap and return the |
duke@435 | 3461 | // entry to the free list |
duke@435 | 3462 | hashmap->remove(prev, pos, entry); |
duke@435 | 3463 | destroy_entry(entry); |
duke@435 | 3464 | |
duke@435 | 3465 | // destroy the weak ref |
duke@435 | 3466 | JNIHandles::destroy_weak_global(ref); |
duke@435 | 3467 | |
duke@435 | 3468 | // post the event to the profiler |
duke@435 | 3469 | if (post_object_free) { |
duke@435 | 3470 | JvmtiExport::post_object_free(env(), tag); |
duke@435 | 3471 | } |
duke@435 | 3472 | |
duke@435 | 3473 | freed++; |
duke@435 | 3474 | entry = next; |
duke@435 | 3475 | continue; |
duke@435 | 3476 | } |
duke@435 | 3477 | |
duke@435 | 3478 | // if this is the young hashmap then the object is either promoted |
duke@435 | 3479 | // or moved. |
duke@435 | 3480 | // if this is the other hashmap then the object is moved. |
duke@435 | 3481 | |
duke@435 | 3482 | bool same_gen; |
duke@435 | 3483 | if (i == 0) { |
duke@435 | 3484 | assert(hashmap == young_hashmap, "checking"); |
duke@435 | 3485 | same_gen = is_in_young(oop); |
duke@435 | 3486 | } else { |
duke@435 | 3487 | same_gen = true; |
duke@435 | 3488 | } |
duke@435 | 3489 | |
duke@435 | 3490 | |
duke@435 | 3491 | if (same_gen) { |
duke@435 | 3492 | // if the object has moved then re-hash it and move its |
duke@435 | 3493 | // entry to its new location. |
duke@435 | 3494 | unsigned int new_pos = JvmtiTagHashmap::hash(oop, size); |
duke@435 | 3495 | if (new_pos != (unsigned int)pos) { |
duke@435 | 3496 | if (prev == NULL) { |
duke@435 | 3497 | table[pos] = next; |
duke@435 | 3498 | } else { |
duke@435 | 3499 | prev->set_next(next); |
duke@435 | 3500 | } |
duke@435 | 3501 | entry->set_next(table[new_pos]); |
duke@435 | 3502 | table[new_pos] = entry; |
duke@435 | 3503 | moved++; |
duke@435 | 3504 | } else { |
duke@435 | 3505 | // object didn't move |
duke@435 | 3506 | prev = entry; |
duke@435 | 3507 | } |
duke@435 | 3508 | } else { |
duke@435 | 3509 | // object has been promoted so remove the entry from the |
duke@435 | 3510 | // young hashmap |
duke@435 | 3511 | assert(hashmap == young_hashmap, "checking"); |
duke@435 | 3512 | hashmap->remove(prev, pos, entry); |
duke@435 | 3513 | |
duke@435 | 3514 | // move the entry to the promoted list |
duke@435 | 3515 | entry->set_next(promoted_entries); |
duke@435 | 3516 | promoted_entries = entry; |
duke@435 | 3517 | } |
duke@435 | 3518 | |
duke@435 | 3519 | entry = next; |
duke@435 | 3520 | } |
duke@435 | 3521 | } |
duke@435 | 3522 | } |
duke@435 | 3523 | |
duke@435 | 3524 | |
duke@435 | 3525 | // add the entries, corresponding to the promoted objects, to the |
duke@435 | 3526 | // other hashmap. |
duke@435 | 3527 | JvmtiTagHashmapEntry* entry = promoted_entries; |
duke@435 | 3528 | while (entry != NULL) { |
duke@435 | 3529 | oop o = JNIHandles::resolve(entry->object()); |
duke@435 | 3530 | assert(hashmap_for(o) == other_hashmap, "checking"); |
duke@435 | 3531 | JvmtiTagHashmapEntry* next = entry->next(); |
duke@435 | 3532 | other_hashmap->add(o, entry); |
duke@435 | 3533 | entry = next; |
duke@435 | 3534 | promoted++; |
duke@435 | 3535 | } |
duke@435 | 3536 | |
duke@435 | 3537 | // stats |
duke@435 | 3538 | if (TraceJVMTIObjectTagging) { |
duke@435 | 3539 | int total_moves = promoted + moved; |
duke@435 | 3540 | |
duke@435 | 3541 | int post_total = 0; |
duke@435 | 3542 | for (int i=0; i<n_hashmaps; i++) { |
duke@435 | 3543 | post_total += _hashmap[i]->_entry_count; |
duke@435 | 3544 | } |
duke@435 | 3545 | int pre_total = post_total + freed; |
duke@435 | 3546 | |
duke@435 | 3547 | tty->print("(%d->%d, %d freed, %d promoted, %d total moves)", |
duke@435 | 3548 | pre_total, post_total, freed, promoted, total_moves); |
duke@435 | 3549 | } |
duke@435 | 3550 | } |