Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiTagMap.cpp @ 6495:75f130f2b30f
moved AMD64 specific HotSpot code in com.oracle.graal.hotspot.amd64 project
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 03 Oct 2012 01:18:03 +0200 |
parents | 1d7922586cf6 |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "jvmtifiles/jvmtiEnv.hpp" | |
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30 #include "oops/instanceMirrorKlass.hpp" |
1972 | 31 #include "oops/objArrayKlass.hpp" |
32 #include "oops/oop.inline2.hpp" | |
33 #include "prims/jvmtiEventController.hpp" | |
34 #include "prims/jvmtiEventController.inline.hpp" | |
35 #include "prims/jvmtiExport.hpp" | |
36 #include "prims/jvmtiImpl.hpp" | |
37 #include "prims/jvmtiTagMap.hpp" | |
38 #include "runtime/biasedLocking.hpp" | |
39 #include "runtime/javaCalls.hpp" | |
40 #include "runtime/jniHandles.hpp" | |
41 #include "runtime/mutex.hpp" | |
42 #include "runtime/mutexLocker.hpp" | |
43 #include "runtime/reflectionUtils.hpp" | |
44 #include "runtime/vframe.hpp" | |
45 #include "runtime/vmThread.hpp" | |
46 #include "runtime/vm_operations.hpp" | |
47 #include "services/serviceUtil.hpp" | |
48 #ifndef SERIALGC | |
49 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
50 #endif | |
0 | 51 |
52 // JvmtiTagHashmapEntry | |
53 // | |
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54 // Each entry encapsulates a reference to the tagged object |
0 | 55 // and the tag value. In addition an entry includes a next pointer which |
56 // is used to chain entries together. | |
57 | |
6197 | 58 class JvmtiTagHashmapEntry : public CHeapObj<mtInternal> { |
0 | 59 private: |
60 friend class JvmtiTagMap; | |
61 | |
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62 oop _object; // tagged object |
0 | 63 jlong _tag; // the tag |
64 JvmtiTagHashmapEntry* _next; // next on the list | |
65 | |
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66 inline void init(oop object, jlong tag) { |
0 | 67 _object = object; |
68 _tag = tag; | |
69 _next = NULL; | |
70 } | |
71 | |
72 // constructor | |
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73 JvmtiTagHashmapEntry(oop object, jlong tag) { init(object, tag); } |
0 | 74 |
75 public: | |
76 | |
77 // accessor methods | |
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78 inline oop object() const { return _object; } |
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79 inline oop* object_addr() { return &_object; } |
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80 inline jlong tag() const { return _tag; } |
0 | 81 |
82 inline void set_tag(jlong tag) { | |
83 assert(tag != 0, "can't be zero"); | |
84 _tag = tag; | |
85 } | |
86 | |
87 inline JvmtiTagHashmapEntry* next() const { return _next; } | |
88 inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; } | |
89 }; | |
90 | |
91 | |
92 // JvmtiTagHashmap | |
93 // | |
94 // A hashmap is essentially a table of pointers to entries. Entries | |
95 // are hashed to a location, or position in the table, and then | |
96 // chained from that location. The "key" for hashing is address of | |
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97 // the object, or oop. The "value" is the tag value. |
0 | 98 // |
99 // A hashmap maintains a count of the number entries in the hashmap | |
100 // and resizes if the number of entries exceeds a given threshold. | |
101 // The threshold is specified as a percentage of the size - for | |
102 // example a threshold of 0.75 will trigger the hashmap to resize | |
103 // if the number of entries is >75% of table size. | |
104 // | |
105 // A hashmap provides functions for adding, removing, and finding | |
106 // entries. It also provides a function to iterate over all entries | |
107 // in the hashmap. | |
108 | |
6197 | 109 class JvmtiTagHashmap : public CHeapObj<mtInternal> { |
0 | 110 private: |
111 friend class JvmtiTagMap; | |
112 | |
113 enum { | |
114 small_trace_threshold = 10000, // threshold for tracing | |
115 medium_trace_threshold = 100000, | |
116 large_trace_threshold = 1000000, | |
117 initial_trace_threshold = small_trace_threshold | |
118 }; | |
119 | |
120 static int _sizes[]; // array of possible hashmap sizes | |
121 int _size; // actual size of the table | |
122 int _size_index; // index into size table | |
123 | |
124 int _entry_count; // number of entries in the hashmap | |
125 | |
126 float _load_factor; // load factor as a % of the size | |
127 int _resize_threshold; // computed threshold to trigger resizing. | |
128 bool _resizing_enabled; // indicates if hashmap can resize | |
129 | |
130 int _trace_threshold; // threshold for trace messages | |
131 | |
132 JvmtiTagHashmapEntry** _table; // the table of entries. | |
133 | |
134 // private accessors | |
135 int resize_threshold() const { return _resize_threshold; } | |
136 int trace_threshold() const { return _trace_threshold; } | |
137 | |
138 // initialize the hashmap | |
139 void init(int size_index=0, float load_factor=4.0f) { | |
140 int initial_size = _sizes[size_index]; | |
141 _size_index = size_index; | |
142 _size = initial_size; | |
143 _entry_count = 0; | |
144 if (TraceJVMTIObjectTagging) { | |
145 _trace_threshold = initial_trace_threshold; | |
146 } else { | |
147 _trace_threshold = -1; | |
148 } | |
149 _load_factor = load_factor; | |
150 _resize_threshold = (int)(_load_factor * _size); | |
151 _resizing_enabled = true; | |
152 size_t s = initial_size * sizeof(JvmtiTagHashmapEntry*); | |
6197 | 153 _table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
0 | 154 if (_table == NULL) { |
155 vm_exit_out_of_memory(s, "unable to allocate initial hashtable for jvmti object tags"); | |
156 } | |
157 for (int i=0; i<initial_size; i++) { | |
158 _table[i] = NULL; | |
159 } | |
160 } | |
161 | |
162 // hash a given key (oop) with the specified size | |
163 static unsigned int hash(oop key, int size) { | |
164 // shift right to get better distribution (as these bits will be zero | |
165 // with aligned addresses) | |
166 unsigned int addr = (unsigned int)((intptr_t)key); | |
167 #ifdef _LP64 | |
168 return (addr >> 3) % size; | |
169 #else | |
170 return (addr >> 2) % size; | |
171 #endif | |
172 } | |
173 | |
174 // hash a given key (oop) | |
175 unsigned int hash(oop key) { | |
176 return hash(key, _size); | |
177 } | |
178 | |
179 // resize the hashmap - allocates a large table and re-hashes | |
180 // all entries into the new table. | |
181 void resize() { | |
182 int new_size_index = _size_index+1; | |
183 int new_size = _sizes[new_size_index]; | |
184 if (new_size < 0) { | |
185 // hashmap already at maximum capacity | |
186 return; | |
187 } | |
188 | |
189 // allocate new table | |
190 size_t s = new_size * sizeof(JvmtiTagHashmapEntry*); | |
6197 | 191 JvmtiTagHashmapEntry** new_table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
0 | 192 if (new_table == NULL) { |
193 warning("unable to allocate larger hashtable for jvmti object tags"); | |
194 set_resizing_enabled(false); | |
195 return; | |
196 } | |
197 | |
198 // initialize new table | |
199 int i; | |
200 for (i=0; i<new_size; i++) { | |
201 new_table[i] = NULL; | |
202 } | |
203 | |
204 // rehash all entries into the new table | |
205 for (i=0; i<_size; i++) { | |
206 JvmtiTagHashmapEntry* entry = _table[i]; | |
207 while (entry != NULL) { | |
208 JvmtiTagHashmapEntry* next = entry->next(); | |
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209 oop key = entry->object(); |
0 | 210 assert(key != NULL, "jni weak reference cleared!!"); |
211 unsigned int h = hash(key, new_size); | |
212 JvmtiTagHashmapEntry* anchor = new_table[h]; | |
213 if (anchor == NULL) { | |
214 new_table[h] = entry; | |
215 entry->set_next(NULL); | |
216 } else { | |
217 entry->set_next(anchor); | |
218 new_table[h] = entry; | |
219 } | |
220 entry = next; | |
221 } | |
222 } | |
223 | |
224 // free old table and update settings. | |
225 os::free((void*)_table); | |
226 _table = new_table; | |
227 _size_index = new_size_index; | |
228 _size = new_size; | |
229 | |
230 // compute new resize threshold | |
231 _resize_threshold = (int)(_load_factor * _size); | |
232 } | |
233 | |
234 | |
235 // internal remove function - remove an entry at a given position in the | |
236 // table. | |
237 inline void remove(JvmtiTagHashmapEntry* prev, int pos, JvmtiTagHashmapEntry* entry) { | |
238 assert(pos >= 0 && pos < _size, "out of range"); | |
239 if (prev == NULL) { | |
240 _table[pos] = entry->next(); | |
241 } else { | |
242 prev->set_next(entry->next()); | |
243 } | |
244 assert(_entry_count > 0, "checking"); | |
245 _entry_count--; | |
246 } | |
247 | |
248 // resizing switch | |
249 bool is_resizing_enabled() const { return _resizing_enabled; } | |
250 void set_resizing_enabled(bool enable) { _resizing_enabled = enable; } | |
251 | |
252 // debugging | |
253 void print_memory_usage(); | |
254 void compute_next_trace_threshold(); | |
255 | |
256 public: | |
257 | |
258 // create a JvmtiTagHashmap of a preferred size and optionally a load factor. | |
259 // The preferred size is rounded down to an actual size. | |
260 JvmtiTagHashmap(int size, float load_factor=0.0f) { | |
261 int i=0; | |
262 while (_sizes[i] < size) { | |
263 if (_sizes[i] < 0) { | |
264 assert(i > 0, "sanity check"); | |
265 i--; | |
266 break; | |
267 } | |
268 i++; | |
269 } | |
270 | |
271 // if a load factor is specified then use it, otherwise use default | |
272 if (load_factor > 0.01f) { | |
273 init(i, load_factor); | |
274 } else { | |
275 init(i); | |
276 } | |
277 } | |
278 | |
279 // create a JvmtiTagHashmap with default settings | |
280 JvmtiTagHashmap() { | |
281 init(); | |
282 } | |
283 | |
284 // release table when JvmtiTagHashmap destroyed | |
285 ~JvmtiTagHashmap() { | |
286 if (_table != NULL) { | |
287 os::free((void*)_table); | |
288 _table = NULL; | |
289 } | |
290 } | |
291 | |
292 // accessors | |
293 int size() const { return _size; } | |
294 JvmtiTagHashmapEntry** table() const { return _table; } | |
295 int entry_count() const { return _entry_count; } | |
296 | |
297 // find an entry in the hashmap, returns NULL if not found. | |
298 inline JvmtiTagHashmapEntry* find(oop key) { | |
299 unsigned int h = hash(key); | |
300 JvmtiTagHashmapEntry* entry = _table[h]; | |
301 while (entry != NULL) { | |
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302 if (entry->object() == key) { |
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303 return entry; |
0 | 304 } |
305 entry = entry->next(); | |
306 } | |
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307 return NULL; |
0 | 308 } |
309 | |
310 | |
311 // add a new entry to hashmap | |
312 inline void add(oop key, JvmtiTagHashmapEntry* entry) { | |
313 assert(key != NULL, "checking"); | |
314 assert(find(key) == NULL, "duplicate detected"); | |
315 unsigned int h = hash(key); | |
316 JvmtiTagHashmapEntry* anchor = _table[h]; | |
317 if (anchor == NULL) { | |
318 _table[h] = entry; | |
319 entry->set_next(NULL); | |
320 } else { | |
321 entry->set_next(anchor); | |
322 _table[h] = entry; | |
323 } | |
324 | |
325 _entry_count++; | |
326 if (trace_threshold() > 0 && entry_count() >= trace_threshold()) { | |
327 assert(TraceJVMTIObjectTagging, "should only get here when tracing"); | |
328 print_memory_usage(); | |
329 compute_next_trace_threshold(); | |
330 } | |
331 | |
332 // if the number of entries exceed the threshold then resize | |
333 if (entry_count() > resize_threshold() && is_resizing_enabled()) { | |
334 resize(); | |
335 } | |
336 } | |
337 | |
338 // remove an entry with the given key. | |
339 inline JvmtiTagHashmapEntry* remove(oop key) { | |
340 unsigned int h = hash(key); | |
341 JvmtiTagHashmapEntry* entry = _table[h]; | |
342 JvmtiTagHashmapEntry* prev = NULL; | |
343 while (entry != NULL) { | |
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344 if (key == entry->object()) { |
0 | 345 break; |
346 } | |
347 prev = entry; | |
348 entry = entry->next(); | |
349 } | |
350 if (entry != NULL) { | |
351 remove(prev, h, entry); | |
352 } | |
353 return entry; | |
354 } | |
355 | |
356 // iterate over all entries in the hashmap | |
357 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); | |
358 }; | |
359 | |
360 // possible hashmap sizes - odd primes that roughly double in size. | |
361 // To avoid excessive resizing the odd primes from 4801-76831 and | |
362 // 76831-307261 have been removed. The list must be terminated by -1. | |
363 int JvmtiTagHashmap::_sizes[] = { 4801, 76831, 307261, 614563, 1228891, | |
364 2457733, 4915219, 9830479, 19660831, 39321619, 78643219, -1 }; | |
365 | |
366 | |
367 // A supporting class for iterating over all entries in Hashmap | |
368 class JvmtiTagHashmapEntryClosure { | |
369 public: | |
370 virtual void do_entry(JvmtiTagHashmapEntry* entry) = 0; | |
371 }; | |
372 | |
373 | |
374 // iterate over all entries in the hashmap | |
375 void JvmtiTagHashmap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
376 for (int i=0; i<_size; i++) { | |
377 JvmtiTagHashmapEntry* entry = _table[i]; | |
378 JvmtiTagHashmapEntry* prev = NULL; | |
379 while (entry != NULL) { | |
380 // obtain the next entry before invoking do_entry - this is | |
381 // necessary because do_entry may remove the entry from the | |
382 // hashmap. | |
383 JvmtiTagHashmapEntry* next = entry->next(); | |
384 closure->do_entry(entry); | |
385 entry = next; | |
386 } | |
387 } | |
388 } | |
389 | |
390 // debugging | |
391 void JvmtiTagHashmap::print_memory_usage() { | |
392 intptr_t p = (intptr_t)this; | |
393 tty->print("[JvmtiTagHashmap @ " INTPTR_FORMAT, p); | |
394 | |
395 // table + entries in KB | |
396 int hashmap_usage = (size()*sizeof(JvmtiTagHashmapEntry*) + | |
397 entry_count()*sizeof(JvmtiTagHashmapEntry))/K; | |
398 | |
399 int weak_globals_usage = (int)(JNIHandles::weak_global_handle_memory_usage()/K); | |
400 tty->print_cr(", %d entries (%d KB) <JNI weak globals: %d KB>]", | |
401 entry_count(), hashmap_usage, weak_globals_usage); | |
402 } | |
403 | |
404 // compute threshold for the next trace message | |
405 void JvmtiTagHashmap::compute_next_trace_threshold() { | |
406 if (trace_threshold() < medium_trace_threshold) { | |
407 _trace_threshold += small_trace_threshold; | |
408 } else { | |
409 if (trace_threshold() < large_trace_threshold) { | |
410 _trace_threshold += medium_trace_threshold; | |
411 } else { | |
412 _trace_threshold += large_trace_threshold; | |
413 } | |
414 } | |
415 } | |
416 | |
417 // create a JvmtiTagMap | |
418 JvmtiTagMap::JvmtiTagMap(JvmtiEnv* env) : | |
419 _env(env), | |
420 _lock(Mutex::nonleaf+2, "JvmtiTagMap._lock", false), | |
421 _free_entries(NULL), | |
422 _free_entries_count(0) | |
423 { | |
424 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
425 assert(((JvmtiEnvBase *)env)->tag_map() == NULL, "tag map already exists for environment"); | |
426 | |
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427 _hashmap = new JvmtiTagHashmap(); |
0 | 428 |
429 // finally add us to the environment | |
430 ((JvmtiEnvBase *)env)->set_tag_map(this); | |
431 } | |
432 | |
433 | |
434 // destroy a JvmtiTagMap | |
435 JvmtiTagMap::~JvmtiTagMap() { | |
436 | |
437 // no lock acquired as we assume the enclosing environment is | |
438 // also being destroryed. | |
439 ((JvmtiEnvBase *)_env)->set_tag_map(NULL); | |
440 | |
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441 JvmtiTagHashmapEntry** table = _hashmap->table(); |
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442 for (int j = 0; j < _hashmap->size(); j++) { |
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443 JvmtiTagHashmapEntry* entry = table[j]; |
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444 while (entry != NULL) { |
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445 JvmtiTagHashmapEntry* next = entry->next(); |
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446 delete entry; |
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447 entry = next; |
0 | 448 } |
449 } | |
450 | |
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451 // finally destroy the hashmap |
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452 delete _hashmap; |
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453 _hashmap = NULL; |
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454 |
0 | 455 // remove any entries on the free list |
456 JvmtiTagHashmapEntry* entry = _free_entries; | |
457 while (entry != NULL) { | |
458 JvmtiTagHashmapEntry* next = entry->next(); | |
459 delete entry; | |
460 entry = next; | |
461 } | |
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462 _free_entries = NULL; |
0 | 463 } |
464 | |
465 // create a hashmap entry | |
466 // - if there's an entry on the (per-environment) free list then this | |
467 // is returned. Otherwise an new entry is allocated. | |
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468 JvmtiTagHashmapEntry* JvmtiTagMap::create_entry(oop ref, jlong tag) { |
0 | 469 assert(Thread::current()->is_VM_thread() || is_locked(), "checking"); |
470 JvmtiTagHashmapEntry* entry; | |
471 if (_free_entries == NULL) { | |
472 entry = new JvmtiTagHashmapEntry(ref, tag); | |
473 } else { | |
474 assert(_free_entries_count > 0, "mismatched _free_entries_count"); | |
475 _free_entries_count--; | |
476 entry = _free_entries; | |
477 _free_entries = entry->next(); | |
478 entry->init(ref, tag); | |
479 } | |
480 return entry; | |
481 } | |
482 | |
483 // destroy an entry by returning it to the free list | |
484 void JvmtiTagMap::destroy_entry(JvmtiTagHashmapEntry* entry) { | |
485 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
486 // limit the size of the free list | |
487 if (_free_entries_count >= max_free_entries) { | |
488 delete entry; | |
489 } else { | |
490 entry->set_next(_free_entries); | |
491 _free_entries = entry; | |
492 _free_entries_count++; | |
493 } | |
494 } | |
495 | |
496 // returns the tag map for the given environments. If the tag map | |
497 // doesn't exist then it is created. | |
498 JvmtiTagMap* JvmtiTagMap::tag_map_for(JvmtiEnv* env) { | |
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499 JvmtiTagMap* tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 500 if (tag_map == NULL) { |
501 MutexLocker mu(JvmtiThreadState_lock); | |
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502 tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 503 if (tag_map == NULL) { |
504 tag_map = new JvmtiTagMap(env); | |
505 } | |
506 } else { | |
507 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
508 } | |
509 return tag_map; | |
510 } | |
511 | |
512 // iterate over all entries in the tag map. | |
513 void JvmtiTagMap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
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514 hashmap()->entry_iterate(closure); |
0 | 515 } |
516 | |
517 // returns true if the hashmaps are empty | |
518 bool JvmtiTagMap::is_empty() { | |
519 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
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520 return hashmap()->entry_count() == 0; |
0 | 521 } |
522 | |
523 | |
524 // Return the tag value for an object, or 0 if the object is | |
525 // not tagged | |
526 // | |
527 static inline jlong tag_for(JvmtiTagMap* tag_map, oop o) { | |
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528 JvmtiTagHashmapEntry* entry = tag_map->hashmap()->find(o); |
0 | 529 if (entry == NULL) { |
530 return 0; | |
531 } else { | |
532 return entry->tag(); | |
533 } | |
534 } | |
535 | |
536 // If the object is a java.lang.Class then return the klassOop, | |
537 // otherwise return the original object | |
538 static inline oop klassOop_if_java_lang_Class(oop o) { | |
1142 | 539 if (o->klass() == SystemDictionary::Class_klass()) { |
0 | 540 if (!java_lang_Class::is_primitive(o)) { |
541 o = (oop)java_lang_Class::as_klassOop(o); | |
542 assert(o != NULL, "class for non-primitive mirror must exist"); | |
543 } | |
544 } | |
545 return o; | |
546 } | |
547 | |
548 // A CallbackWrapper is a support class for querying and tagging an object | |
549 // around a callback to a profiler. The constructor does pre-callback | |
550 // work to get the tag value, klass tag value, ... and the destructor | |
551 // does the post-callback work of tagging or untagging the object. | |
552 // | |
553 // { | |
554 // CallbackWrapper wrapper(tag_map, o); | |
555 // | |
556 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
557 // | |
558 // } // wrapper goes out of scope here which results in the destructor | |
559 // checking to see if the object has been tagged, untagged, or the | |
560 // tag value has changed. | |
561 // | |
562 class CallbackWrapper : public StackObj { | |
563 private: | |
564 JvmtiTagMap* _tag_map; | |
565 JvmtiTagHashmap* _hashmap; | |
566 JvmtiTagHashmapEntry* _entry; | |
567 oop _o; | |
568 jlong _obj_size; | |
569 jlong _obj_tag; | |
570 klassOop _klass; // the object's class | |
571 jlong _klass_tag; | |
572 | |
573 protected: | |
574 JvmtiTagMap* tag_map() const { return _tag_map; } | |
575 | |
576 // invoked post-callback to tag, untag, or update the tag of an object | |
577 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
578 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
579 public: | |
580 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
581 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
582 "MT unsafe or must be VM thread"); | |
583 | |
584 // for Classes the klassOop is tagged | |
585 _o = klassOop_if_java_lang_Class(o); | |
586 | |
587 // object size | |
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588 _obj_size = (jlong)_o->size() * wordSize; |
0 | 589 |
590 // record the context | |
591 _tag_map = tag_map; | |
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592 _hashmap = tag_map->hashmap(); |
0 | 593 _entry = _hashmap->find(_o); |
594 | |
595 // get object tag | |
596 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
597 | |
598 // get the class and the class's tag value | |
599 if (_o == o) { | |
600 _klass = _o->klass(); | |
601 } else { | |
602 // if the object represents a runtime class then use the | |
603 // tag for java.lang.Class | |
1142 | 604 _klass = SystemDictionary::Class_klass(); |
0 | 605 } |
606 _klass_tag = tag_for(tag_map, _klass); | |
607 } | |
608 | |
609 ~CallbackWrapper() { | |
610 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
611 } | |
612 | |
613 inline jlong* obj_tag_p() { return &_obj_tag; } | |
614 inline jlong obj_size() const { return _obj_size; } | |
615 inline jlong obj_tag() const { return _obj_tag; } | |
616 inline klassOop klass() const { return _klass; } | |
617 inline jlong klass_tag() const { return _klass_tag; } | |
618 }; | |
619 | |
620 | |
621 | |
622 // callback post-callback to tag, untag, or update the tag of an object | |
623 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
624 JvmtiTagHashmap* hashmap, | |
625 JvmtiTagHashmapEntry* entry, | |
626 jlong obj_tag) { | |
627 if (entry == NULL) { | |
628 if (obj_tag != 0) { | |
629 // callback has tagged the object | |
630 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
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631 entry = tag_map()->create_entry(o, obj_tag); |
0 | 632 hashmap->add(o, entry); |
633 } | |
634 } else { | |
635 // object was previously tagged - the callback may have untagged | |
636 // the object or changed the tag value | |
637 if (obj_tag == 0) { | |
638 | |
639 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
640 assert(entry_removed == entry, "checking"); | |
641 tag_map()->destroy_entry(entry); | |
642 | |
643 } else { | |
644 if (obj_tag != entry->tag()) { | |
645 entry->set_tag(obj_tag); | |
646 } | |
647 } | |
648 } | |
649 } | |
650 | |
651 // An extended CallbackWrapper used when reporting an object reference | |
652 // to the agent. | |
653 // | |
654 // { | |
655 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
656 // | |
657 // (*callback)(wrapper.klass_tag(), | |
658 // wrapper.obj_size(), | |
659 // wrapper.obj_tag_p() | |
660 // wrapper.referrer_tag_p(), ...) | |
661 // | |
662 // } // wrapper goes out of scope here which results in the destructor | |
663 // checking to see if the referrer object has been tagged, untagged, | |
664 // or the tag value has changed. | |
665 // | |
666 class TwoOopCallbackWrapper : public CallbackWrapper { | |
667 private: | |
668 bool _is_reference_to_self; | |
669 JvmtiTagHashmap* _referrer_hashmap; | |
670 JvmtiTagHashmapEntry* _referrer_entry; | |
671 oop _referrer; | |
672 jlong _referrer_obj_tag; | |
673 jlong _referrer_klass_tag; | |
674 jlong* _referrer_tag_p; | |
675 | |
676 bool is_reference_to_self() const { return _is_reference_to_self; } | |
677 | |
678 public: | |
679 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
680 CallbackWrapper(tag_map, o) | |
681 { | |
682 // self reference needs to be handled in a special way | |
683 _is_reference_to_self = (referrer == o); | |
684 | |
685 if (_is_reference_to_self) { | |
686 _referrer_klass_tag = klass_tag(); | |
687 _referrer_tag_p = obj_tag_p(); | |
688 } else { | |
689 // for Classes the klassOop is tagged | |
690 _referrer = klassOop_if_java_lang_Class(referrer); | |
691 // record the context | |
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692 _referrer_hashmap = tag_map->hashmap(); |
0 | 693 _referrer_entry = _referrer_hashmap->find(_referrer); |
694 | |
695 // get object tag | |
696 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
697 _referrer_tag_p = &_referrer_obj_tag; | |
698 | |
699 // get referrer class tag. | |
700 klassOop k = (_referrer == referrer) ? // Check if referrer is a class... | |
701 _referrer->klass() // No, just get its class | |
1142 | 702 : SystemDictionary::Class_klass(); // Yes, its class is Class |
0 | 703 _referrer_klass_tag = tag_for(tag_map, k); |
704 } | |
705 } | |
706 | |
707 ~TwoOopCallbackWrapper() { | |
708 if (!is_reference_to_self()){ | |
709 post_callback_tag_update(_referrer, | |
710 _referrer_hashmap, | |
711 _referrer_entry, | |
712 _referrer_obj_tag); | |
713 } | |
714 } | |
715 | |
716 // address of referrer tag | |
717 // (for a self reference this will return the same thing as obj_tag_p()) | |
718 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
719 | |
720 // referrer's class tag | |
721 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
722 }; | |
723 | |
724 // tag an object | |
725 // | |
726 // This function is performance critical. If many threads attempt to tag objects | |
727 // around the same time then it's possible that the Mutex associated with the | |
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728 // tag map will be a hot lock. |
0 | 729 void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
730 MutexLocker ml(lock()); | |
731 | |
732 // resolve the object | |
733 oop o = JNIHandles::resolve_non_null(object); | |
734 | |
735 // for Classes we tag the klassOop | |
736 o = klassOop_if_java_lang_Class(o); | |
737 | |
738 // see if the object is already tagged | |
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739 JvmtiTagHashmap* hashmap = _hashmap; |
0 | 740 JvmtiTagHashmapEntry* entry = hashmap->find(o); |
741 | |
742 // if the object is not already tagged then we tag it | |
743 if (entry == NULL) { | |
744 if (tag != 0) { | |
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745 entry = create_entry(o, tag); |
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746 hashmap->add(o, entry); |
0 | 747 } else { |
748 // no-op | |
749 } | |
750 } else { | |
751 // if the object is already tagged then we either update | |
752 // the tag (if a new tag value has been provided) | |
753 // or remove the object if the new tag value is 0. | |
754 if (tag == 0) { | |
755 hashmap->remove(o); | |
756 destroy_entry(entry); | |
757 } else { | |
758 entry->set_tag(tag); | |
759 } | |
760 } | |
761 } | |
762 | |
763 // get the tag for an object | |
764 jlong JvmtiTagMap::get_tag(jobject object) { | |
765 MutexLocker ml(lock()); | |
766 | |
767 // resolve the object | |
768 oop o = JNIHandles::resolve_non_null(object); | |
769 | |
770 // for Classes get the tag from the klassOop | |
771 return tag_for(this, klassOop_if_java_lang_Class(o)); | |
772 } | |
773 | |
774 | |
775 // Helper class used to describe the static or instance fields of a class. | |
776 // For each field it holds the field index (as defined by the JVMTI specification), | |
777 // the field type, and the offset. | |
778 | |
6197 | 779 class ClassFieldDescriptor: public CHeapObj<mtInternal> { |
0 | 780 private: |
781 int _field_index; | |
782 int _field_offset; | |
783 char _field_type; | |
784 public: | |
785 ClassFieldDescriptor(int index, char type, int offset) : | |
786 _field_index(index), _field_type(type), _field_offset(offset) { | |
787 } | |
788 int field_index() const { return _field_index; } | |
789 char field_type() const { return _field_type; } | |
790 int field_offset() const { return _field_offset; } | |
791 }; | |
792 | |
6197 | 793 class ClassFieldMap: public CHeapObj<mtInternal> { |
0 | 794 private: |
795 enum { | |
796 initial_field_count = 5 | |
797 }; | |
798 | |
799 // list of field descriptors | |
800 GrowableArray<ClassFieldDescriptor*>* _fields; | |
801 | |
802 // constructor | |
803 ClassFieldMap(); | |
804 | |
805 // add a field | |
806 void add(int index, char type, int offset); | |
807 | |
808 // returns the field count for the given class | |
809 static int compute_field_count(instanceKlassHandle ikh); | |
810 | |
811 public: | |
812 ~ClassFieldMap(); | |
813 | |
814 // access | |
815 int field_count() { return _fields->length(); } | |
816 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
817 | |
818 // functions to create maps of static or instance fields | |
819 static ClassFieldMap* create_map_of_static_fields(klassOop k); | |
820 static ClassFieldMap* create_map_of_instance_fields(oop obj); | |
821 }; | |
822 | |
823 ClassFieldMap::ClassFieldMap() { | |
6197 | 824 _fields = new (ResourceObj::C_HEAP, mtInternal) |
825 GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
0 | 826 } |
827 | |
828 ClassFieldMap::~ClassFieldMap() { | |
829 for (int i=0; i<_fields->length(); i++) { | |
830 delete _fields->at(i); | |
831 } | |
832 delete _fields; | |
833 } | |
834 | |
835 void ClassFieldMap::add(int index, char type, int offset) { | |
836 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
837 _fields->append(field); | |
838 } | |
839 | |
840 // Returns a heap allocated ClassFieldMap to describe the static fields | |
841 // of the given class. | |
842 // | |
843 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(klassOop k) { | |
844 HandleMark hm; | |
845 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
846 | |
847 // create the field map | |
848 ClassFieldMap* field_map = new ClassFieldMap(); | |
849 | |
850 FilteredFieldStream f(ikh, false, false); | |
851 int max_field_index = f.field_count()-1; | |
852 | |
853 int index = 0; | |
854 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
855 // ignore instance fields | |
856 if (!fld.access_flags().is_static()) { | |
857 continue; | |
858 } | |
859 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
860 } | |
861 return field_map; | |
862 } | |
863 | |
864 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
865 // of the given class. All instance fields are included (this means public | |
866 // and private fields declared in superclasses and superinterfaces too). | |
867 // | |
868 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
869 HandleMark hm; | |
870 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
871 | |
872 // create the field map | |
873 ClassFieldMap* field_map = new ClassFieldMap(); | |
874 | |
875 FilteredFieldStream f(ikh, false, false); | |
876 | |
877 int max_field_index = f.field_count()-1; | |
878 | |
879 int index = 0; | |
880 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
881 // ignore static fields | |
882 if (fld.access_flags().is_static()) { | |
883 continue; | |
884 } | |
885 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
886 } | |
887 | |
888 return field_map; | |
889 } | |
890 | |
891 // Helper class used to cache a ClassFileMap for the instance fields of | |
892 // a cache. A JvmtiCachedClassFieldMap can be cached by an instanceKlass during | |
893 // heap iteration and avoid creating a field map for each object in the heap | |
894 // (only need to create the map when the first instance of a class is encountered). | |
895 // | |
6197 | 896 class JvmtiCachedClassFieldMap : public CHeapObj<mtInternal> { |
0 | 897 private: |
898 enum { | |
899 initial_class_count = 200 | |
900 }; | |
901 ClassFieldMap* _field_map; | |
902 | |
903 ClassFieldMap* field_map() const { return _field_map; } | |
904 | |
905 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
906 ~JvmtiCachedClassFieldMap(); | |
907 | |
908 static GrowableArray<instanceKlass*>* _class_list; | |
909 static void add_to_class_list(instanceKlass* ik); | |
910 | |
911 public: | |
912 // returns the field map for a given object (returning map cached | |
913 // by instanceKlass if possible | |
914 static ClassFieldMap* get_map_of_instance_fields(oop obj); | |
915 | |
916 // removes the field map from all instanceKlasses - should be | |
917 // called before VM operation completes | |
918 static void clear_cache(); | |
919 | |
920 // returns the number of ClassFieldMap cached by instanceKlasses | |
921 static int cached_field_map_count(); | |
922 }; | |
923 | |
924 GrowableArray<instanceKlass*>* JvmtiCachedClassFieldMap::_class_list; | |
925 | |
926 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
927 _field_map = field_map; | |
928 } | |
929 | |
930 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
931 if (_field_map != NULL) { | |
932 delete _field_map; | |
933 } | |
934 } | |
935 | |
936 // Marker class to ensure that the class file map cache is only used in a defined | |
937 // scope. | |
938 class ClassFieldMapCacheMark : public StackObj { | |
939 private: | |
940 static bool _is_active; | |
941 public: | |
942 ClassFieldMapCacheMark() { | |
943 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
944 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
945 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
946 _is_active = true; | |
947 } | |
948 ~ClassFieldMapCacheMark() { | |
949 JvmtiCachedClassFieldMap::clear_cache(); | |
950 _is_active = false; | |
951 } | |
952 static bool is_active() { return _is_active; } | |
953 }; | |
954 | |
955 bool ClassFieldMapCacheMark::_is_active; | |
956 | |
957 | |
958 // record that the given instanceKlass is caching a field map | |
959 void JvmtiCachedClassFieldMap::add_to_class_list(instanceKlass* ik) { | |
960 if (_class_list == NULL) { | |
6197 | 961 _class_list = new (ResourceObj::C_HEAP, mtInternal) |
962 GrowableArray<instanceKlass*>(initial_class_count, true); | |
0 | 963 } |
964 _class_list->push(ik); | |
965 } | |
966 | |
967 // returns the instance field map for the given object | |
968 // (returns field map cached by the instanceKlass if possible) | |
969 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { | |
970 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
971 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
972 | |
973 klassOop k = obj->klass(); | |
974 instanceKlass* ik = instanceKlass::cast(k); | |
975 | |
976 // return cached map if possible | |
977 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
978 if (cached_map != NULL) { | |
979 assert(cached_map->field_map() != NULL, "missing field list"); | |
980 return cached_map->field_map(); | |
981 } else { | |
982 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
983 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
984 ik->set_jvmti_cached_class_field_map(cached_map); | |
985 add_to_class_list(ik); | |
986 return field_map; | |
987 } | |
988 } | |
989 | |
990 // remove the fields maps cached from all instanceKlasses | |
991 void JvmtiCachedClassFieldMap::clear_cache() { | |
992 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
993 if (_class_list != NULL) { | |
994 for (int i = 0; i < _class_list->length(); i++) { | |
995 instanceKlass* ik = _class_list->at(i); | |
996 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
997 assert(cached_map != NULL, "should not be NULL"); | |
998 ik->set_jvmti_cached_class_field_map(NULL); | |
999 delete cached_map; // deletes the encapsulated field map | |
1000 } | |
1001 delete _class_list; | |
1002 _class_list = NULL; | |
1003 } | |
1004 } | |
1005 | |
1006 // returns the number of ClassFieldMap cached by instanceKlasses | |
1007 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
1008 return (_class_list == NULL) ? 0 : _class_list->length(); | |
1009 } | |
1010 | |
1011 // helper function to indicate if an object is filtered by its tag or class tag | |
1012 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
1013 jlong klass_tag, | |
1014 int heap_filter) { | |
1015 // apply the heap filter | |
1016 if (obj_tag != 0) { | |
1017 // filter out tagged objects | |
1018 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
1019 } else { | |
1020 // filter out untagged objects | |
1021 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
1022 } | |
1023 if (klass_tag != 0) { | |
1024 // filter out objects with tagged classes | |
1025 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
1026 } else { | |
1027 // filter out objects with untagged classes. | |
1028 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
1029 } | |
1030 return false; | |
1031 } | |
1032 | |
1033 // helper function to indicate if an object is filtered by a klass filter | |
1034 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
1035 if (!klass_filter.is_null()) { | |
1036 if (obj->klass() != klass_filter()) { | |
1037 return true; | |
1038 } | |
1039 } | |
1040 return false; | |
1041 } | |
1042 | |
1043 // helper function to tell if a field is a primitive field or not | |
1044 static inline bool is_primitive_field_type(char type) { | |
1045 return (type != 'L' && type != '['); | |
1046 } | |
1047 | |
1048 // helper function to copy the value from location addr to jvalue. | |
1049 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
1050 switch (value_type) { | |
1051 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
1052 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
1053 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
1054 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
1055 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
1056 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
1057 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
1058 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
1059 default: ShouldNotReachHere(); | |
1060 } | |
1061 } | |
1062 | |
1063 // helper function to invoke string primitive value callback | |
1064 // returns visit control flags | |
1065 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
1066 CallbackWrapper* wrapper, | |
1067 oop str, | |
1068 void* user_data) | |
1069 { | |
1142 | 1070 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 1071 |
1072 // get the string value and length | |
1073 // (string value may be offset from the base) | |
1074 int s_len = java_lang_String::length(str); | |
1075 typeArrayOop s_value = java_lang_String::value(str); | |
1076 int s_offset = java_lang_String::offset(str); | |
1077 jchar* value; | |
1078 if (s_len > 0) { | |
1079 value = s_value->char_at_addr(s_offset); | |
1080 } else { | |
1081 value = (jchar*) s_value->base(T_CHAR); | |
1082 } | |
1083 | |
1084 // invoke the callback | |
1085 return (*cb)(wrapper->klass_tag(), | |
1086 wrapper->obj_size(), | |
1087 wrapper->obj_tag_p(), | |
1088 value, | |
1089 (jint)s_len, | |
1090 user_data); | |
1091 } | |
1092 | |
1093 // helper function to invoke string primitive value callback | |
1094 // returns visit control flags | |
1095 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
1096 CallbackWrapper* wrapper, | |
1097 oop obj, | |
1098 void* user_data) | |
1099 { | |
1100 assert(obj->is_typeArray(), "not a primitive array"); | |
1101 | |
1102 // get base address of first element | |
1103 typeArrayOop array = typeArrayOop(obj); | |
1104 BasicType type = typeArrayKlass::cast(array->klass())->element_type(); | |
1105 void* elements = array->base(type); | |
1106 | |
1107 // jvmtiPrimitiveType is defined so this mapping is always correct | |
1108 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
1109 | |
1110 return (*cb)(wrapper->klass_tag(), | |
1111 wrapper->obj_size(), | |
1112 wrapper->obj_tag_p(), | |
1113 (jint)array->length(), | |
1114 elem_type, | |
1115 elements, | |
1116 user_data); | |
1117 } | |
1118 | |
1119 // helper function to invoke the primitive field callback for all static fields | |
1120 // of a given class | |
1121 static jint invoke_primitive_field_callback_for_static_fields | |
1122 (CallbackWrapper* wrapper, | |
1123 oop obj, | |
1124 jvmtiPrimitiveFieldCallback cb, | |
1125 void* user_data) | |
1126 { | |
1127 // for static fields only the index will be set | |
1128 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1129 | |
1142 | 1130 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
0 | 1131 if (java_lang_Class::is_primitive(obj)) { |
1132 return 0; | |
1133 } | |
1134 klassOop k = java_lang_Class::as_klassOop(obj); | |
1135 Klass* klass = k->klass_part(); | |
1136 | |
1137 // ignore classes for object and type arrays | |
1138 if (!klass->oop_is_instance()) { | |
1139 return 0; | |
1140 } | |
1141 | |
1142 // ignore classes which aren't linked yet | |
1143 instanceKlass* ik = instanceKlass::cast(k); | |
1144 if (!ik->is_linked()) { | |
1145 return 0; | |
1146 } | |
1147 | |
1148 // get the field map | |
1149 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
1150 | |
1151 // invoke the callback for each static primitive field | |
1152 for (int i=0; i<field_map->field_count(); i++) { | |
1153 ClassFieldDescriptor* field = field_map->field_at(i); | |
1154 | |
1155 // ignore non-primitive fields | |
1156 char type = field->field_type(); | |
1157 if (!is_primitive_field_type(type)) { | |
1158 continue; | |
1159 } | |
1160 // one-to-one mapping | |
1161 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1162 | |
1163 // get offset and field value | |
1164 int offset = field->field_offset(); | |
1165 address addr = (address)k + offset; | |
1166 jvalue value; | |
1167 copy_to_jvalue(&value, addr, value_type); | |
1168 | |
1169 // field index | |
1170 reference_info.field.index = field->field_index(); | |
1171 | |
1172 // invoke the callback | |
1173 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
1174 &reference_info, | |
1175 wrapper->klass_tag(), | |
1176 wrapper->obj_tag_p(), | |
1177 value, | |
1178 value_type, | |
1179 user_data); | |
1180 if (res & JVMTI_VISIT_ABORT) { | |
1181 delete field_map; | |
1182 return res; | |
1183 } | |
1184 } | |
1185 | |
1186 delete field_map; | |
1187 return 0; | |
1188 } | |
1189 | |
1190 // helper function to invoke the primitive field callback for all instance fields | |
1191 // of a given object | |
1192 static jint invoke_primitive_field_callback_for_instance_fields( | |
1193 CallbackWrapper* wrapper, | |
1194 oop obj, | |
1195 jvmtiPrimitiveFieldCallback cb, | |
1196 void* user_data) | |
1197 { | |
1198 // for instance fields only the index will be set | |
1199 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1200 | |
1201 // get the map of the instance fields | |
1202 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
1203 | |
1204 // invoke the callback for each instance primitive field | |
1205 for (int i=0; i<fields->field_count(); i++) { | |
1206 ClassFieldDescriptor* field = fields->field_at(i); | |
1207 | |
1208 // ignore non-primitive fields | |
1209 char type = field->field_type(); | |
1210 if (!is_primitive_field_type(type)) { | |
1211 continue; | |
1212 } | |
1213 // one-to-one mapping | |
1214 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1215 | |
1216 // get offset and field value | |
1217 int offset = field->field_offset(); | |
1218 address addr = (address)obj + offset; | |
1219 jvalue value; | |
1220 copy_to_jvalue(&value, addr, value_type); | |
1221 | |
1222 // field index | |
1223 reference_info.field.index = field->field_index(); | |
1224 | |
1225 // invoke the callback | |
1226 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
1227 &reference_info, | |
1228 wrapper->klass_tag(), | |
1229 wrapper->obj_tag_p(), | |
1230 value, | |
1231 value_type, | |
1232 user_data); | |
1233 if (res & JVMTI_VISIT_ABORT) { | |
1234 return res; | |
1235 } | |
1236 } | |
1237 return 0; | |
1238 } | |
1239 | |
1240 | |
1241 // VM operation to iterate over all objects in the heap (both reachable | |
1242 // and unreachable) | |
1243 class VM_HeapIterateOperation: public VM_Operation { | |
1244 private: | |
1245 ObjectClosure* _blk; | |
1246 public: | |
1247 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
1248 | |
1249 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
1250 void doit() { | |
1251 // allows class files maps to be cached during iteration | |
1252 ClassFieldMapCacheMark cm; | |
1253 | |
1254 // make sure that heap is parsable (fills TLABs with filler objects) | |
1255 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1256 | |
1257 // Verify heap before iteration - if the heap gets corrupted then | |
1258 // JVMTI's IterateOverHeap will crash. | |
1259 if (VerifyBeforeIteration) { | |
1260 Universe::verify(); | |
1261 } | |
1262 | |
1263 // do the iteration | |
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1264 // If this operation encounters a bad object when using CMS, |
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1265 // consider using safe_object_iterate() which avoids perm gen |
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1266 // objects that may contain bad references. |
0 | 1267 Universe::heap()->object_iterate(_blk); |
1268 | |
1269 // when sharing is enabled we must iterate over the shared spaces | |
1270 if (UseSharedSpaces) { | |
1271 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1272 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
1273 gen->ro_space()->object_iterate(_blk); | |
1274 gen->rw_space()->object_iterate(_blk); | |
1275 } | |
1276 } | |
1277 | |
1278 }; | |
1279 | |
1280 | |
1281 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
1282 // IterateOverInstancesOfClass functions | |
1283 class IterateOverHeapObjectClosure: public ObjectClosure { | |
1284 private: | |
1285 JvmtiTagMap* _tag_map; | |
1286 KlassHandle _klass; | |
1287 jvmtiHeapObjectFilter _object_filter; | |
1288 jvmtiHeapObjectCallback _heap_object_callback; | |
1289 const void* _user_data; | |
1290 | |
1291 // accessors | |
1292 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1293 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
1294 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
1295 KlassHandle klass() const { return _klass; } | |
1296 const void* user_data() const { return _user_data; } | |
1297 | |
1298 // indicates if iteration has been aborted | |
1299 bool _iteration_aborted; | |
1300 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1301 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
1302 | |
1303 public: | |
1304 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
1305 KlassHandle klass, | |
1306 jvmtiHeapObjectFilter object_filter, | |
1307 jvmtiHeapObjectCallback heap_object_callback, | |
1308 const void* user_data) : | |
1309 _tag_map(tag_map), | |
1310 _klass(klass), | |
1311 _object_filter(object_filter), | |
1312 _heap_object_callback(heap_object_callback), | |
1313 _user_data(user_data), | |
1314 _iteration_aborted(false) | |
1315 { | |
1316 } | |
1317 | |
1318 void do_object(oop o); | |
1319 }; | |
1320 | |
1321 // invoked for each object in the heap | |
1322 void IterateOverHeapObjectClosure::do_object(oop o) { | |
1323 // check if iteration has been halted | |
1324 if (is_iteration_aborted()) return; | |
1325 | |
1326 // ignore any objects that aren't visible to profiler | |
1327 if (!ServiceUtil::visible_oop(o)) return; | |
1328 | |
1329 // instanceof check when filtering by klass | |
1330 if (!klass().is_null() && !o->is_a(klass()())) { | |
1331 return; | |
1332 } | |
1333 // prepare for the calllback | |
1334 CallbackWrapper wrapper(tag_map(), o); | |
1335 | |
1336 // if the object is tagged and we're only interested in untagged objects | |
1337 // then don't invoke the callback. Similiarly, if the object is untagged | |
1338 // and we're only interested in tagged objects we skip the callback. | |
1339 if (wrapper.obj_tag() != 0) { | |
1340 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
1341 } else { | |
1342 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
1343 } | |
1344 | |
1345 // invoke the agent's callback | |
1346 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
1347 wrapper.obj_size(), | |
1348 wrapper.obj_tag_p(), | |
1349 (void*)user_data()); | |
1350 if (control == JVMTI_ITERATION_ABORT) { | |
1351 set_iteration_aborted(true); | |
1352 } | |
1353 } | |
1354 | |
1355 // An ObjectClosure used to support the IterateThroughHeap function | |
1356 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
1357 private: | |
1358 JvmtiTagMap* _tag_map; | |
1359 KlassHandle _klass; | |
1360 int _heap_filter; | |
1361 const jvmtiHeapCallbacks* _callbacks; | |
1362 const void* _user_data; | |
1363 | |
1364 // accessor functions | |
1365 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1366 int heap_filter() const { return _heap_filter; } | |
1367 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
1368 KlassHandle klass() const { return _klass; } | |
1369 const void* user_data() const { return _user_data; } | |
1370 | |
1371 // indicates if the iteration has been aborted | |
1372 bool _iteration_aborted; | |
1373 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1374 | |
1375 // used to check the visit control flags. If the abort flag is set | |
1376 // then we set the iteration aborted flag so that the iteration completes | |
1377 // without processing any further objects | |
1378 bool check_flags_for_abort(jint flags) { | |
1379 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
1380 if (is_abort) { | |
1381 _iteration_aborted = true; | |
1382 } | |
1383 return is_abort; | |
1384 } | |
1385 | |
1386 public: | |
1387 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
1388 KlassHandle klass, | |
1389 int heap_filter, | |
1390 const jvmtiHeapCallbacks* heap_callbacks, | |
1391 const void* user_data) : | |
1392 _tag_map(tag_map), | |
1393 _klass(klass), | |
1394 _heap_filter(heap_filter), | |
1395 _callbacks(heap_callbacks), | |
1396 _user_data(user_data), | |
1397 _iteration_aborted(false) | |
1398 { | |
1399 } | |
1400 | |
1401 void do_object(oop o); | |
1402 }; | |
1403 | |
1404 // invoked for each object in the heap | |
1405 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
1406 // check if iteration has been halted | |
1407 if (is_iteration_aborted()) return; | |
1408 | |
1409 // ignore any objects that aren't visible to profiler | |
1410 if (!ServiceUtil::visible_oop(obj)) return; | |
1411 | |
1412 // apply class filter | |
1413 if (is_filtered_by_klass_filter(obj, klass())) return; | |
1414 | |
1415 // prepare for callback | |
1416 CallbackWrapper wrapper(tag_map(), obj); | |
1417 | |
1418 // check if filtered by the heap filter | |
1419 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
1420 return; | |
1421 } | |
1422 | |
1423 // for arrays we need the length, otherwise -1 | |
1424 bool is_array = obj->is_array(); | |
1425 int len = is_array ? arrayOop(obj)->length() : -1; | |
1426 | |
1427 // invoke the object callback (if callback is provided) | |
1428 if (callbacks()->heap_iteration_callback != NULL) { | |
1429 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
1430 jint res = (*cb)(wrapper.klass_tag(), | |
1431 wrapper.obj_size(), | |
1432 wrapper.obj_tag_p(), | |
1433 (jint)len, | |
1434 (void*)user_data()); | |
1435 if (check_flags_for_abort(res)) return; | |
1436 } | |
1437 | |
1438 // for objects and classes we report primitive fields if callback provided | |
1439 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
1440 jint res; | |
1441 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
1142 | 1442 if (obj->klass() == SystemDictionary::Class_klass()) { |
0 | 1443 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
1444 obj, | |
1445 cb, | |
1446 (void*)user_data()); | |
1447 } else { | |
1448 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
1449 obj, | |
1450 cb, | |
1451 (void*)user_data()); | |
1452 } | |
1453 if (check_flags_for_abort(res)) return; | |
1454 } | |
1455 | |
1456 // string callback | |
1457 if (!is_array && | |
1458 callbacks()->string_primitive_value_callback != NULL && | |
1142 | 1459 obj->klass() == SystemDictionary::String_klass()) { |
0 | 1460 jint res = invoke_string_value_callback( |
1461 callbacks()->string_primitive_value_callback, | |
1462 &wrapper, | |
1463 obj, | |
1464 (void*)user_data() ); | |
1465 if (check_flags_for_abort(res)) return; | |
1466 } | |
1467 | |
1468 // array callback | |
1469 if (is_array && | |
1470 callbacks()->array_primitive_value_callback != NULL && | |
1471 obj->is_typeArray()) { | |
1472 jint res = invoke_array_primitive_value_callback( | |
1473 callbacks()->array_primitive_value_callback, | |
1474 &wrapper, | |
1475 obj, | |
1476 (void*)user_data() ); | |
1477 if (check_flags_for_abort(res)) return; | |
1478 } | |
1479 }; | |
1480 | |
1481 | |
1482 // Deprecated function to iterate over all objects in the heap | |
1483 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
1484 KlassHandle klass, | |
1485 jvmtiHeapObjectCallback heap_object_callback, | |
1486 const void* user_data) | |
1487 { | |
1488 MutexLocker ml(Heap_lock); | |
1489 IterateOverHeapObjectClosure blk(this, | |
1490 klass, | |
1491 object_filter, | |
1492 heap_object_callback, | |
1493 user_data); | |
1494 VM_HeapIterateOperation op(&blk); | |
1495 VMThread::execute(&op); | |
1496 } | |
1497 | |
1498 | |
1499 // Iterates over all objects in the heap | |
1500 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
1501 KlassHandle klass, | |
1502 const jvmtiHeapCallbacks* callbacks, | |
1503 const void* user_data) | |
1504 { | |
1505 MutexLocker ml(Heap_lock); | |
1506 IterateThroughHeapObjectClosure blk(this, | |
1507 klass, | |
1508 heap_filter, | |
1509 callbacks, | |
1510 user_data); | |
1511 VM_HeapIterateOperation op(&blk); | |
1512 VMThread::execute(&op); | |
1513 } | |
1514 | |
1515 // support class for get_objects_with_tags | |
1516 | |
1517 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
1518 private: | |
1519 JvmtiEnv* _env; | |
1520 jlong* _tags; | |
1521 jint _tag_count; | |
1522 | |
1523 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
1524 GrowableArray<uint64_t>* _tag_results; // collected tags | |
1525 | |
1526 public: | |
1527 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
1528 _env = env; | |
1529 _tags = (jlong*)tags; | |
1530 _tag_count = tag_count; | |
6197 | 1531 _object_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jobject>(1,true); |
1532 _tag_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<uint64_t>(1,true); | |
0 | 1533 } |
1534 | |
1535 ~TagObjectCollector() { | |
1536 delete _object_results; | |
1537 delete _tag_results; | |
1538 } | |
1539 | |
1540 // for each tagged object check if the tag value matches | |
1541 // - if it matches then we create a JNI local reference to the object | |
1542 // and record the reference and tag value. | |
1543 // | |
1544 void do_entry(JvmtiTagHashmapEntry* entry) { | |
1545 for (int i=0; i<_tag_count; i++) { | |
1546 if (_tags[i] == entry->tag()) { | |
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1547 oop o = entry->object(); |
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1548 assert(o != NULL, "sanity check"); |
0 | 1549 |
1550 // the mirror is tagged | |
1551 if (o->is_klass()) { | |
1552 klassOop k = (klassOop)o; | |
1553 o = Klass::cast(k)->java_mirror(); | |
1554 } | |
1555 | |
1556 jobject ref = JNIHandles::make_local(JavaThread::current(), o); | |
1557 _object_results->append(ref); | |
1558 _tag_results->append((uint64_t)entry->tag()); | |
1559 } | |
1560 } | |
1561 } | |
1562 | |
1563 // return the results from the collection | |
1564 // | |
1565 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1566 jvmtiError error; | |
1567 int count = _object_results->length(); | |
1568 assert(count >= 0, "sanity check"); | |
1569 | |
1570 // if object_result_ptr is not NULL then allocate the result and copy | |
1571 // in the object references. | |
1572 if (object_result_ptr != NULL) { | |
1573 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
1574 if (error != JVMTI_ERROR_NONE) { | |
1575 return error; | |
1576 } | |
1577 for (int i=0; i<count; i++) { | |
1578 (*object_result_ptr)[i] = _object_results->at(i); | |
1579 } | |
1580 } | |
1581 | |
1582 // if tag_result_ptr is not NULL then allocate the result and copy | |
1583 // in the tag values. | |
1584 if (tag_result_ptr != NULL) { | |
1585 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
1586 if (error != JVMTI_ERROR_NONE) { | |
1587 if (object_result_ptr != NULL) { | |
1588 _env->Deallocate((unsigned char*)object_result_ptr); | |
1589 } | |
1590 return error; | |
1591 } | |
1592 for (int i=0; i<count; i++) { | |
1593 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
1594 } | |
1595 } | |
1596 | |
1597 *count_ptr = count; | |
1598 return JVMTI_ERROR_NONE; | |
1599 } | |
1600 }; | |
1601 | |
1602 // return the list of objects with the specified tags | |
1603 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
1604 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1605 | |
1606 TagObjectCollector collector(env(), tags, count); | |
1607 { | |
1608 // iterate over all tagged objects | |
1609 MutexLocker ml(lock()); | |
1610 entry_iterate(&collector); | |
1611 } | |
1612 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
1613 } | |
1614 | |
1615 | |
1616 // ObjectMarker is used to support the marking objects when walking the | |
1617 // heap. | |
1618 // | |
1619 // This implementation uses the existing mark bits in an object for | |
1620 // marking. Objects that are marked must later have their headers restored. | |
1621 // As most objects are unlocked and don't have their identity hash computed | |
1622 // we don't have to save their headers. Instead we save the headers that | |
1623 // are "interesting". Later when the headers are restored this implementation | |
1624 // restores all headers to their initial value and then restores the few | |
1625 // objects that had interesting headers. | |
1626 // | |
1627 // Future work: This implementation currently uses growable arrays to save | |
1628 // the oop and header of interesting objects. As an optimization we could | |
1629 // use the same technique as the GC and make use of the unused area | |
1630 // between top() and end(). | |
1631 // | |
1632 | |
1633 // An ObjectClosure used to restore the mark bits of an object | |
1634 class RestoreMarksClosure : public ObjectClosure { | |
1635 public: | |
1636 void do_object(oop o) { | |
1637 if (o != NULL) { | |
1638 markOop mark = o->mark(); | |
1639 if (mark->is_marked()) { | |
1640 o->init_mark(); | |
1641 } | |
1642 } | |
1643 } | |
1644 }; | |
1645 | |
1646 // ObjectMarker provides the mark and visited functions | |
1647 class ObjectMarker : AllStatic { | |
1648 private: | |
1649 // saved headers | |
1650 static GrowableArray<oop>* _saved_oop_stack; | |
1651 static GrowableArray<markOop>* _saved_mark_stack; | |
3815 | 1652 static bool _needs_reset; // do we need to reset mark bits? |
0 | 1653 |
1654 public: | |
1655 static void init(); // initialize | |
1656 static void done(); // clean-up | |
1657 | |
1658 static inline void mark(oop o); // mark an object | |
1659 static inline bool visited(oop o); // check if object has been visited | |
3815 | 1660 |
1661 static inline bool needs_reset() { return _needs_reset; } | |
1662 static inline void set_needs_reset(bool v) { _needs_reset = v; } | |
0 | 1663 }; |
1664 | |
1665 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
1666 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
3815 | 1667 bool ObjectMarker::_needs_reset = true; // need to reset mark bits by default |
0 | 1668 |
1669 // initialize ObjectMarker - prepares for object marking | |
1670 void ObjectMarker::init() { | |
1671 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
1672 | |
1673 // prepare heap for iteration | |
1674 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1675 | |
1676 // create stacks for interesting headers | |
6197 | 1677 _saved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markOop>(4000, true); |
1678 _saved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(4000, true); | |
0 | 1679 |
1680 if (UseBiasedLocking) { | |
1681 BiasedLocking::preserve_marks(); | |
1682 } | |
1683 } | |
1684 | |
1685 // Object marking is done so restore object headers | |
1686 void ObjectMarker::done() { | |
1687 // iterate over all objects and restore the mark bits to | |
1688 // their initial value | |
1689 RestoreMarksClosure blk; | |
3815 | 1690 if (needs_reset()) { |
1691 Universe::heap()->object_iterate(&blk); | |
1692 } else { | |
1693 // We don't need to reset mark bits on this call, but reset the | |
1694 // flag to the default for the next call. | |
1695 set_needs_reset(true); | |
1696 } | |
0 | 1697 |
1698 // When sharing is enabled we need to restore the headers of the objects | |
1699 // in the readwrite space too. | |
1700 if (UseSharedSpaces) { | |
1701 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1702 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
1703 gen->rw_space()->object_iterate(&blk); | |
1704 } | |
1705 | |
1706 // now restore the interesting headers | |
1707 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
1708 oop o = _saved_oop_stack->at(i); | |
1709 markOop mark = _saved_mark_stack->at(i); | |
1710 o->set_mark(mark); | |
1711 } | |
1712 | |
1713 if (UseBiasedLocking) { | |
1714 BiasedLocking::restore_marks(); | |
1715 } | |
1716 | |
1717 // free the stacks | |
1718 delete _saved_oop_stack; | |
1719 delete _saved_mark_stack; | |
1720 } | |
1721 | |
1722 // mark an object | |
1723 inline void ObjectMarker::mark(oop o) { | |
1724 assert(Universe::heap()->is_in(o), "sanity check"); | |
1725 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
1726 | |
1727 // object's mark word | |
1728 markOop mark = o->mark(); | |
1729 | |
1730 if (mark->must_be_preserved(o)) { | |
1731 _saved_mark_stack->push(mark); | |
1732 _saved_oop_stack->push(o); | |
1733 } | |
1734 | |
1735 // mark the object | |
1736 o->set_mark(markOopDesc::prototype()->set_marked()); | |
1737 } | |
1738 | |
1739 // return true if object is marked | |
1740 inline bool ObjectMarker::visited(oop o) { | |
1741 return o->mark()->is_marked(); | |
1742 } | |
1743 | |
1744 // Stack allocated class to help ensure that ObjectMarker is used | |
1745 // correctly. Constructor initializes ObjectMarker, destructor calls | |
1746 // ObjectMarker's done() function to restore object headers. | |
1747 class ObjectMarkerController : public StackObj { | |
1748 public: | |
1749 ObjectMarkerController() { | |
1750 ObjectMarker::init(); | |
1751 } | |
1752 ~ObjectMarkerController() { | |
1753 ObjectMarker::done(); | |
1754 } | |
1755 }; | |
1756 | |
1757 | |
1758 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
1759 // (not performance critical as only used for roots) | |
1760 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
1761 switch (kind) { | |
1762 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
1763 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
1764 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
1765 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
1766 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
1767 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
1768 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
1769 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
1770 } | |
1771 } | |
1772 | |
1773 // Base class for all heap walk contexts. The base class maintains a flag | |
1774 // to indicate if the context is valid or not. | |
1775 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
1776 private: | |
1777 bool _valid; | |
1778 public: | |
1779 HeapWalkContext(bool valid) { _valid = valid; } | |
1780 void invalidate() { _valid = false; } | |
1781 bool is_valid() const { return _valid; } | |
1782 }; | |
1783 | |
1784 // A basic heap walk context for the deprecated heap walking functions. | |
1785 // The context for a basic heap walk are the callbacks and fields used by | |
1786 // the referrer caching scheme. | |
1787 class BasicHeapWalkContext: public HeapWalkContext { | |
1788 private: | |
1789 jvmtiHeapRootCallback _heap_root_callback; | |
1790 jvmtiStackReferenceCallback _stack_ref_callback; | |
1791 jvmtiObjectReferenceCallback _object_ref_callback; | |
1792 | |
1793 // used for caching | |
1794 oop _last_referrer; | |
1795 jlong _last_referrer_tag; | |
1796 | |
1797 public: | |
1798 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
1799 | |
1800 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
1801 jvmtiStackReferenceCallback stack_ref_callback, | |
1802 jvmtiObjectReferenceCallback object_ref_callback) : | |
1803 HeapWalkContext(true), | |
1804 _heap_root_callback(heap_root_callback), | |
1805 _stack_ref_callback(stack_ref_callback), | |
1806 _object_ref_callback(object_ref_callback), | |
1807 _last_referrer(NULL), | |
1808 _last_referrer_tag(0) { | |
1809 } | |
1810 | |
1811 // accessors | |
1812 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
1813 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
1814 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
1815 | |
1816 oop last_referrer() const { return _last_referrer; } | |
1817 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
1818 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
1819 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
1820 }; | |
1821 | |
1822 // The advanced heap walk context for the FollowReferences functions. | |
1823 // The context is the callbacks, and the fields used for filtering. | |
1824 class AdvancedHeapWalkContext: public HeapWalkContext { | |
1825 private: | |
1826 jint _heap_filter; | |
1827 KlassHandle _klass_filter; | |
1828 const jvmtiHeapCallbacks* _heap_callbacks; | |
1829 | |
1830 public: | |
1831 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
1832 | |
1833 AdvancedHeapWalkContext(jint heap_filter, | |
1834 KlassHandle klass_filter, | |
1835 const jvmtiHeapCallbacks* heap_callbacks) : | |
1836 HeapWalkContext(true), | |
1837 _heap_filter(heap_filter), | |
1838 _klass_filter(klass_filter), | |
1839 _heap_callbacks(heap_callbacks) { | |
1840 } | |
1841 | |
1842 // accessors | |
1843 jint heap_filter() const { return _heap_filter; } | |
1844 KlassHandle klass_filter() const { return _klass_filter; } | |
1845 | |
1846 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
1847 return _heap_callbacks->heap_reference_callback; | |
1848 }; | |
1849 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
1850 return _heap_callbacks->primitive_field_callback; | |
1851 } | |
1852 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
1853 return _heap_callbacks->array_primitive_value_callback; | |
1854 } | |
1855 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
1856 return _heap_callbacks->string_primitive_value_callback; | |
1857 } | |
1858 }; | |
1859 | |
1860 // The CallbackInvoker is a class with static functions that the heap walk can call | |
1861 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
1862 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
1863 // mode is for the newer FollowReferences function which supports a lot of | |
1864 // additional callbacks. | |
1865 class CallbackInvoker : AllStatic { | |
1866 private: | |
1867 // heap walk styles | |
1868 enum { basic, advanced }; | |
1869 static int _heap_walk_type; | |
1870 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
1871 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
1872 | |
1873 // context for basic style heap walk | |
1874 static BasicHeapWalkContext _basic_context; | |
1875 static BasicHeapWalkContext* basic_context() { | |
1876 assert(_basic_context.is_valid(), "invalid"); | |
1877 return &_basic_context; | |
1878 } | |
1879 | |
1880 // context for advanced style heap walk | |
1881 static AdvancedHeapWalkContext _advanced_context; | |
1882 static AdvancedHeapWalkContext* advanced_context() { | |
1883 assert(_advanced_context.is_valid(), "invalid"); | |
1884 return &_advanced_context; | |
1885 } | |
1886 | |
1887 // context needed for all heap walks | |
1888 static JvmtiTagMap* _tag_map; | |
1889 static const void* _user_data; | |
1890 static GrowableArray<oop>* _visit_stack; | |
1891 | |
1892 // accessors | |
1893 static JvmtiTagMap* tag_map() { return _tag_map; } | |
1894 static const void* user_data() { return _user_data; } | |
1895 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
1896 | |
1897 // if the object hasn't been visited then push it onto the visit stack | |
1898 // so that it will be visited later | |
1899 static inline bool check_for_visit(oop obj) { | |
1900 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
1901 return true; | |
1902 } | |
1903 | |
1904 // invoke basic style callbacks | |
1905 static inline bool invoke_basic_heap_root_callback | |
1906 (jvmtiHeapRootKind root_kind, oop obj); | |
1907 static inline bool invoke_basic_stack_ref_callback | |
1908 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
1909 int slot, oop obj); | |
1910 static inline bool invoke_basic_object_reference_callback | |
1911 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1912 | |
1913 // invoke advanced style callbacks | |
1914 static inline bool invoke_advanced_heap_root_callback | |
1915 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
1916 static inline bool invoke_advanced_stack_ref_callback | |
1917 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
1918 jmethodID method, jlocation bci, jint slot, oop obj); | |
1919 static inline bool invoke_advanced_object_reference_callback | |
1920 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1921 | |
1922 // used to report the value of primitive fields | |
1923 static inline bool report_primitive_field | |
1924 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
1925 | |
1926 public: | |
1927 // initialize for basic mode | |
1928 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1929 GrowableArray<oop>* visit_stack, | |
1930 const void* user_data, | |
1931 BasicHeapWalkContext context); | |
1932 | |
1933 // initialize for advanced mode | |
1934 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1935 GrowableArray<oop>* visit_stack, | |
1936 const void* user_data, | |
1937 AdvancedHeapWalkContext context); | |
1938 | |
1939 // functions to report roots | |
1940 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
1941 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
1942 jmethodID m, oop o); | |
1943 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
1944 jmethodID method, jlocation bci, jint slot, oop o); | |
1945 | |
1946 // functions to report references | |
1947 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
1948 static inline bool report_class_reference(oop referrer, oop referree); | |
1949 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
1950 static inline bool report_signers_reference(oop referrer, oop referree); | |
1951 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
1952 static inline bool report_superclass_reference(oop referrer, oop referree); | |
1953 static inline bool report_interface_reference(oop referrer, oop referree); | |
1954 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
1955 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
1956 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
1957 static inline bool report_primitive_array_values(oop array); | |
1958 static inline bool report_string_value(oop str); | |
1959 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
1960 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
1961 }; | |
1962 | |
1963 // statics | |
1964 int CallbackInvoker::_heap_walk_type; | |
1965 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
1966 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
1967 JvmtiTagMap* CallbackInvoker::_tag_map; | |
1968 const void* CallbackInvoker::_user_data; | |
1969 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
1970 | |
1971 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
1972 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1973 GrowableArray<oop>* visit_stack, | |
1974 const void* user_data, | |
1975 BasicHeapWalkContext context) { | |
1976 _tag_map = tag_map; | |
1977 _visit_stack = visit_stack; | |
1978 _user_data = user_data; | |
1979 _basic_context = context; | |
1980 _advanced_context.invalidate(); // will trigger assertion if used | |
1981 _heap_walk_type = basic; | |
1982 } | |
1983 | |
1984 // initialize for advanced heap walk (FollowReferences) | |
1985 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1986 GrowableArray<oop>* visit_stack, | |
1987 const void* user_data, | |
1988 AdvancedHeapWalkContext context) { | |
1989 _tag_map = tag_map; | |
1990 _visit_stack = visit_stack; | |
1991 _user_data = user_data; | |
1992 _advanced_context = context; | |
1993 _basic_context.invalidate(); // will trigger assertion if used | |
1994 _heap_walk_type = advanced; | |
1995 } | |
1996 | |
1997 | |
1998 // invoke basic style heap root callback | |
1999 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
2000 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2001 | |
2002 // if we heap roots should be reported | |
2003 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
2004 if (cb == NULL) { | |
2005 return check_for_visit(obj); | |
2006 } | |
2007 | |
2008 CallbackWrapper wrapper(tag_map(), obj); | |
2009 jvmtiIterationControl control = (*cb)(root_kind, | |
2010 wrapper.klass_tag(), | |
2011 wrapper.obj_size(), | |
2012 wrapper.obj_tag_p(), | |
2013 (void*)user_data()); | |
2014 // push root to visit stack when following references | |
2015 if (control == JVMTI_ITERATION_CONTINUE && | |
2016 basic_context()->object_ref_callback() != NULL) { | |
2017 visit_stack()->push(obj); | |
2018 } | |
2019 return control != JVMTI_ITERATION_ABORT; | |
2020 } | |
2021 | |
2022 // invoke basic style stack ref callback | |
2023 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
2024 jlong thread_tag, | |
2025 jint depth, | |
2026 jmethodID method, | |
2027 jint slot, | |
2028 oop obj) { | |
2029 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2030 | |
2031 // if we stack refs should be reported | |
2032 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
2033 if (cb == NULL) { | |
2034 return check_for_visit(obj); | |
2035 } | |
2036 | |
2037 CallbackWrapper wrapper(tag_map(), obj); | |
2038 jvmtiIterationControl control = (*cb)(root_kind, | |
2039 wrapper.klass_tag(), | |
2040 wrapper.obj_size(), | |
2041 wrapper.obj_tag_p(), | |
2042 thread_tag, | |
2043 depth, | |
2044 method, | |
2045 slot, | |
2046 (void*)user_data()); | |
2047 // push root to visit stack when following references | |
2048 if (control == JVMTI_ITERATION_CONTINUE && | |
2049 basic_context()->object_ref_callback() != NULL) { | |
2050 visit_stack()->push(obj); | |
2051 } | |
2052 return control != JVMTI_ITERATION_ABORT; | |
2053 } | |
2054 | |
2055 // invoke basic style object reference callback | |
2056 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
2057 oop referrer, | |
2058 oop referree, | |
2059 jint index) { | |
2060 | |
2061 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2062 assert(ServiceUtil::visible_oop(referree), "checking"); | |
2063 | |
2064 BasicHeapWalkContext* context = basic_context(); | |
2065 | |
2066 // callback requires the referrer's tag. If it's the same referrer | |
2067 // as the last call then we use the cached value. | |
2068 jlong referrer_tag; | |
2069 if (referrer == context->last_referrer()) { | |
2070 referrer_tag = context->last_referrer_tag(); | |
2071 } else { | |
2072 referrer_tag = tag_for(tag_map(), klassOop_if_java_lang_Class(referrer)); | |
2073 } | |
2074 | |
2075 // do the callback | |
2076 CallbackWrapper wrapper(tag_map(), referree); | |
2077 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
2078 jvmtiIterationControl control = (*cb)(ref_kind, | |
2079 wrapper.klass_tag(), | |
2080 wrapper.obj_size(), | |
2081 wrapper.obj_tag_p(), | |
2082 referrer_tag, | |
2083 index, | |
2084 (void*)user_data()); | |
2085 | |
2086 // record referrer and referrer tag. For self-references record the | |
2087 // tag value from the callback as this might differ from referrer_tag. | |
2088 context->set_last_referrer(referrer); | |
2089 if (referrer == referree) { | |
2090 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
2091 } else { | |
2092 context->set_last_referrer_tag(referrer_tag); | |
2093 } | |
2094 | |
2095 if (control == JVMTI_ITERATION_CONTINUE) { | |
2096 return check_for_visit(referree); | |
2097 } else { | |
2098 return control != JVMTI_ITERATION_ABORT; | |
2099 } | |
2100 } | |
2101 | |
2102 // invoke advanced style heap root callback | |
2103 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
2104 oop obj) { | |
2105 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2106 | |
2107 AdvancedHeapWalkContext* context = advanced_context(); | |
2108 | |
2109 // check that callback is provided | |
2110 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2111 if (cb == NULL) { | |
2112 return check_for_visit(obj); | |
2113 } | |
2114 | |
2115 // apply class filter | |
2116 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2117 return check_for_visit(obj); | |
2118 } | |
2119 | |
2120 // setup the callback wrapper | |
2121 CallbackWrapper wrapper(tag_map(), obj); | |
2122 | |
2123 // apply tag filter | |
2124 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2125 wrapper.klass_tag(), | |
2126 context->heap_filter())) { | |
2127 return check_for_visit(obj); | |
2128 } | |
2129 | |
2130 // for arrays we need the length, otherwise -1 | |
2131 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2132 | |
2133 // invoke the callback | |
2134 jint res = (*cb)(ref_kind, | |
2135 NULL, // referrer info | |
2136 wrapper.klass_tag(), | |
2137 0, // referrer_class_tag is 0 for heap root | |
2138 wrapper.obj_size(), | |
2139 wrapper.obj_tag_p(), | |
2140 NULL, // referrer_tag_p | |
2141 len, | |
2142 (void*)user_data()); | |
2143 if (res & JVMTI_VISIT_ABORT) { | |
2144 return false;// referrer class tag | |
2145 } | |
2146 if (res & JVMTI_VISIT_OBJECTS) { | |
2147 check_for_visit(obj); | |
2148 } | |
2149 return true; | |
2150 } | |
2151 | |
2152 // report a reference from a thread stack to an object | |
2153 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
2154 jlong thread_tag, | |
2155 jlong tid, | |
2156 int depth, | |
2157 jmethodID method, | |
2158 jlocation bci, | |
2159 jint slot, | |
2160 oop obj) { | |
2161 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2162 | |
2163 AdvancedHeapWalkContext* context = advanced_context(); | |
2164 | |
2165 // check that callback is provider | |
2166 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2167 if (cb == NULL) { | |
2168 return check_for_visit(obj); | |
2169 } | |
2170 | |
2171 // apply class filter | |
2172 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2173 return check_for_visit(obj); | |
2174 } | |
2175 | |
2176 // setup the callback wrapper | |
2177 CallbackWrapper wrapper(tag_map(), obj); | |
2178 | |
2179 // apply tag filter | |
2180 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2181 wrapper.klass_tag(), | |
2182 context->heap_filter())) { | |
2183 return check_for_visit(obj); | |
2184 } | |
2185 | |
2186 // setup the referrer info | |
2187 jvmtiHeapReferenceInfo reference_info; | |
2188 reference_info.stack_local.thread_tag = thread_tag; | |
2189 reference_info.stack_local.thread_id = tid; | |
2190 reference_info.stack_local.depth = depth; | |
2191 reference_info.stack_local.method = method; | |
2192 reference_info.stack_local.location = bci; | |
2193 reference_info.stack_local.slot = slot; | |
2194 | |
2195 // for arrays we need the length, otherwise -1 | |
2196 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2197 | |
2198 // call into the agent | |
2199 int res = (*cb)(ref_kind, | |
2200 &reference_info, | |
2201 wrapper.klass_tag(), | |
2202 0, // referrer_class_tag is 0 for heap root (stack) | |
2203 wrapper.obj_size(), | |
2204 wrapper.obj_tag_p(), | |
2205 NULL, // referrer_tag is 0 for root | |
2206 len, | |
2207 (void*)user_data()); | |
2208 | |
2209 if (res & JVMTI_VISIT_ABORT) { | |
2210 return false; | |
2211 } | |
2212 if (res & JVMTI_VISIT_OBJECTS) { | |
2213 check_for_visit(obj); | |
2214 } | |
2215 return true; | |
2216 } | |
2217 | |
2218 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
2219 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
2220 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
2221 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
2222 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
2223 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
2224 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
2225 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
2226 | |
2227 // invoke the object reference callback to report a reference | |
2228 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
2229 oop referrer, | |
2230 oop obj, | |
2231 jint index) | |
2232 { | |
2233 // field index is only valid field in reference_info | |
2234 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2235 | |
2236 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2237 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2238 | |
2239 AdvancedHeapWalkContext* context = advanced_context(); | |
2240 | |
2241 // check that callback is provider | |
2242 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2243 if (cb == NULL) { | |
2244 return check_for_visit(obj); | |
2245 } | |
2246 | |
2247 // apply class filter | |
2248 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2249 return check_for_visit(obj); | |
2250 } | |
2251 | |
2252 // setup the callback wrapper | |
2253 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
2254 | |
2255 // apply tag filter | |
2256 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2257 wrapper.klass_tag(), | |
2258 context->heap_filter())) { | |
2259 return check_for_visit(obj); | |
2260 } | |
2261 | |
2262 // field index is only valid field in reference_info | |
2263 reference_info.field.index = index; | |
2264 | |
2265 // for arrays we need the length, otherwise -1 | |
2266 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2267 | |
2268 // invoke the callback | |
2269 int res = (*cb)(ref_kind, | |
2270 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
2271 wrapper.klass_tag(), | |
2272 wrapper.referrer_klass_tag(), | |
2273 wrapper.obj_size(), | |
2274 wrapper.obj_tag_p(), | |
2275 wrapper.referrer_tag_p(), | |
2276 len, | |
2277 (void*)user_data()); | |
2278 | |
2279 if (res & JVMTI_VISIT_ABORT) { | |
2280 return false; | |
2281 } | |
2282 if (res & JVMTI_VISIT_OBJECTS) { | |
2283 check_for_visit(obj); | |
2284 } | |
2285 return true; | |
2286 } | |
2287 | |
2288 // report a "simple root" | |
2289 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
2290 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
2291 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
2292 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2293 | |
2294 if (is_basic_heap_walk()) { | |
2295 // map to old style root kind | |
2296 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
2297 return invoke_basic_heap_root_callback(root_kind, obj); | |
2298 } else { | |
2299 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
2300 return invoke_advanced_heap_root_callback(kind, obj); | |
2301 } | |
2302 } | |
2303 | |
2304 | |
2305 // invoke the primitive array values | |
2306 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
2307 assert(obj->is_typeArray(), "not a primitive array"); | |
2308 | |
2309 AdvancedHeapWalkContext* context = advanced_context(); | |
2310 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
2311 | |
2312 // apply class filter | |
2313 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2314 return true; | |
2315 } | |
2316 | |
2317 CallbackWrapper wrapper(tag_map(), obj); | |
2318 | |
2319 // apply tag filter | |
2320 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2321 wrapper.klass_tag(), | |
2322 context->heap_filter())) { | |
2323 return true; | |
2324 } | |
2325 | |
2326 // invoke the callback | |
2327 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
2328 &wrapper, | |
2329 obj, | |
2330 (void*)user_data()); | |
2331 return (!(res & JVMTI_VISIT_ABORT)); | |
2332 } | |
2333 | |
2334 // invoke the string value callback | |
2335 inline bool CallbackInvoker::report_string_value(oop str) { | |
1142 | 2336 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 2337 |
2338 AdvancedHeapWalkContext* context = advanced_context(); | |
2339 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
2340 | |
2341 // apply class filter | |
2342 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
2343 return true; | |
2344 } | |
2345 | |
2346 CallbackWrapper wrapper(tag_map(), str); | |
2347 | |
2348 // apply tag filter | |
2349 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2350 wrapper.klass_tag(), | |
2351 context->heap_filter())) { | |
2352 return true; | |
2353 } | |
2354 | |
2355 // invoke the callback | |
2356 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
2357 &wrapper, | |
2358 str, | |
2359 (void*)user_data()); | |
2360 return (!(res & JVMTI_VISIT_ABORT)); | |
2361 } | |
2362 | |
2363 // invoke the primitive field callback | |
2364 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
2365 oop obj, | |
2366 jint index, | |
2367 address addr, | |
2368 char type) | |
2369 { | |
2370 // for primitive fields only the index will be set | |
2371 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2372 | |
2373 AdvancedHeapWalkContext* context = advanced_context(); | |
2374 assert(context->primitive_field_callback() != NULL, "no callback"); | |
2375 | |
2376 // apply class filter | |
2377 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2378 return true; | |
2379 } | |
2380 | |
2381 CallbackWrapper wrapper(tag_map(), obj); | |
2382 | |
2383 // apply tag filter | |
2384 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2385 wrapper.klass_tag(), | |
2386 context->heap_filter())) { | |
2387 return true; | |
2388 } | |
2389 | |
2390 // the field index in the referrer | |
2391 reference_info.field.index = index; | |
2392 | |
2393 // map the type | |
2394 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
2395 | |
2396 // setup the jvalue | |
2397 jvalue value; | |
2398 copy_to_jvalue(&value, addr, value_type); | |
2399 | |
2400 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
2401 int res = (*cb)(ref_kind, | |
2402 &reference_info, | |
2403 wrapper.klass_tag(), | |
2404 wrapper.obj_tag_p(), | |
2405 value, | |
2406 value_type, | |
2407 (void*)user_data()); | |
2408 return (!(res & JVMTI_VISIT_ABORT)); | |
2409 } | |
2410 | |
2411 | |
2412 // instance field | |
2413 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
2414 jint index, | |
2415 address value, | |
2416 char type) { | |
2417 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
2418 obj, | |
2419 index, | |
2420 value, | |
2421 type); | |
2422 } | |
2423 | |
2424 // static field | |
2425 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
2426 jint index, | |
2427 address value, | |
2428 char type) { | |
2429 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
2430 obj, | |
2431 index, | |
2432 value, | |
2433 type); | |
2434 } | |
2435 | |
2436 // report a JNI local (root object) to the profiler | |
2437 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
2438 if (is_basic_heap_walk()) { | |
2439 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
2440 thread_tag, | |
2441 depth, | |
2442 m, | |
2443 -1, | |
2444 obj); | |
2445 } else { | |
2446 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
2447 thread_tag, tid, | |
2448 depth, | |
2449 m, | |
2450 (jlocation)-1, | |
2451 -1, | |
2452 obj); | |
2453 } | |
2454 } | |
2455 | |
2456 | |
2457 // report a local (stack reference, root object) | |
2458 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
2459 jlong tid, | |
2460 jint depth, | |
2461 jmethodID method, | |
2462 jlocation bci, | |
2463 jint slot, | |
2464 oop obj) { | |
2465 if (is_basic_heap_walk()) { | |
2466 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
2467 thread_tag, | |
2468 depth, | |
2469 method, | |
2470 slot, | |
2471 obj); | |
2472 } else { | |
2473 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
2474 thread_tag, | |
2475 tid, | |
2476 depth, | |
2477 method, | |
2478 bci, | |
2479 slot, | |
2480 obj); | |
2481 } | |
2482 } | |
2483 | |
2484 // report an object referencing a class. | |
2485 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
2486 if (is_basic_heap_walk()) { | |
2487 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2488 } else { | |
2489 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
2490 } | |
2491 } | |
2492 | |
2493 // report a class referencing its class loader. | |
2494 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
2495 if (is_basic_heap_walk()) { | |
2496 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2497 } else { | |
2498 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2499 } | |
2500 } | |
2501 | |
2502 // report a class referencing its signers. | |
2503 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
2504 if (is_basic_heap_walk()) { | |
2505 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
2506 } else { | |
2507 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
2508 } | |
2509 } | |
2510 | |
2511 // report a class referencing its protection domain.. | |
2512 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
2513 if (is_basic_heap_walk()) { | |
2514 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2515 } else { | |
2516 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2517 } | |
2518 } | |
2519 | |
2520 // report a class referencing its superclass. | |
2521 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
2522 if (is_basic_heap_walk()) { | |
2523 // Send this to be consistent with past implementation | |
2524 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2525 } else { | |
2526 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); | |
2527 } | |
2528 } | |
2529 | |
2530 // report a class referencing one of its interfaces. | |
2531 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
2532 if (is_basic_heap_walk()) { | |
2533 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
2534 } else { | |
2535 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
2536 } | |
2537 } | |
2538 | |
2539 // report a class referencing one of its static fields. | |
2540 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
2541 if (is_basic_heap_walk()) { | |
2542 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2543 } else { | |
2544 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2545 } | |
2546 } | |
2547 | |
2548 // report an array referencing an element object | |
2549 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
2550 if (is_basic_heap_walk()) { | |
2551 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2552 } else { | |
2553 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2554 } | |
2555 } | |
2556 | |
2557 // report an object referencing an instance field object | |
2558 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
2559 if (is_basic_heap_walk()) { | |
2560 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
2561 } else { | |
2562 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
2563 } | |
2564 } | |
2565 | |
2566 // report an array referencing an element object | |
2567 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
2568 if (is_basic_heap_walk()) { | |
2569 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2570 } else { | |
2571 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2572 } | |
2573 } | |
2574 | |
2575 // A supporting closure used to process simple roots | |
2576 class SimpleRootsClosure : public OopClosure { | |
2577 private: | |
2578 jvmtiHeapReferenceKind _kind; | |
2579 bool _continue; | |
2580 | |
2581 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
2582 | |
2583 public: | |
2584 void set_kind(jvmtiHeapReferenceKind kind) { | |
2585 _kind = kind; | |
2586 _continue = true; | |
2587 } | |
2588 | |
2589 inline bool stopped() { | |
2590 return !_continue; | |
2591 } | |
2592 | |
2593 void do_oop(oop* obj_p) { | |
2594 // iteration has terminated | |
2595 if (stopped()) { | |
2596 return; | |
2597 } | |
2598 | |
2599 // ignore null or deleted handles | |
2600 oop o = *obj_p; | |
2601 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2602 return; | |
2603 } | |
2604 | |
2605 jvmtiHeapReferenceKind kind = root_kind(); | |
2606 | |
2607 // many roots are Klasses so we use the java mirror | |
2608 if (o->is_klass()) { | |
2609 klassOop k = (klassOop)o; | |
2610 o = Klass::cast(k)->java_mirror(); | |
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2611 if (o == NULL) { |
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2612 // Classes without mirrors don't correspond to real Java |
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2613 // classes so just ignore them. |
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2614 return; |
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2615 } |
0 | 2616 } else { |
2617 | |
2618 // SystemDictionary::always_strong_oops_do reports the application | |
2619 // class loader as a root. We want this root to be reported as | |
2620 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
2621 if (o->is_instance() && root_kind() == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { | |
2622 kind = JVMTI_HEAP_REFERENCE_OTHER; | |
2623 } | |
2624 } | |
2625 | |
2626 // some objects are ignored - in the case of simple | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2145
diff
changeset
|
2627 // roots it's mostly Symbol*s that we are skipping |
0 | 2628 // here. |
2629 if (!ServiceUtil::visible_oop(o)) { | |
2630 return; | |
2631 } | |
2632 | |
2633 // invoke the callback | |
2634 _continue = CallbackInvoker::report_simple_root(kind, o); | |
2635 | |
2636 } | |
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2637 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2638 }; |
2639 | |
2640 // A supporting closure used to process JNI locals | |
2641 class JNILocalRootsClosure : public OopClosure { | |
2642 private: | |
2643 jlong _thread_tag; | |
2644 jlong _tid; | |
2645 jint _depth; | |
2646 jmethodID _method; | |
2647 bool _continue; | |
2648 public: | |
2649 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
2650 _thread_tag = thread_tag; | |
2651 _tid = tid; | |
2652 _depth = depth; | |
2653 _method = method; | |
2654 _continue = true; | |
2655 } | |
2656 | |
2657 inline bool stopped() { | |
2658 return !_continue; | |
2659 } | |
2660 | |
2661 void do_oop(oop* obj_p) { | |
2662 // iteration has terminated | |
2663 if (stopped()) { | |
2664 return; | |
2665 } | |
2666 | |
2667 // ignore null or deleted handles | |
2668 oop o = *obj_p; | |
2669 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2670 return; | |
2671 } | |
2672 | |
2673 if (!ServiceUtil::visible_oop(o)) { | |
2674 return; | |
2675 } | |
2676 | |
2677 // invoke the callback | |
2678 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
2679 } | |
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2680 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2681 }; |
2682 | |
2683 | |
2684 // A VM operation to iterate over objects that are reachable from | |
2685 // a set of roots or an initial object. | |
2686 // | |
2687 // For VM_HeapWalkOperation the set of roots used is :- | |
2688 // | |
2689 // - All JNI global references | |
2690 // - All inflated monitors | |
2691 // - All classes loaded by the boot class loader (or all classes | |
2692 // in the event that class unloading is disabled) | |
2693 // - All java threads | |
2694 // - For each java thread then all locals and JNI local references | |
2695 // on the thread's execution stack | |
2696 // - All visible/explainable objects from Universes::oops_do | |
2697 // | |
2698 class VM_HeapWalkOperation: public VM_Operation { | |
2699 private: | |
2700 enum { | |
2701 initial_visit_stack_size = 4000 | |
2702 }; | |
2703 | |
2704 bool _is_advanced_heap_walk; // indicates FollowReferences | |
2705 JvmtiTagMap* _tag_map; | |
2706 Handle _initial_object; | |
2707 GrowableArray<oop>* _visit_stack; // the visit stack | |
2708 | |
2709 bool _collecting_heap_roots; // are we collecting roots | |
2710 bool _following_object_refs; // are we following object references | |
2711 | |
2712 bool _reporting_primitive_fields; // optional reporting | |
2713 bool _reporting_primitive_array_values; | |
2714 bool _reporting_string_values; | |
2715 | |
2716 GrowableArray<oop>* create_visit_stack() { | |
6197 | 2717 return new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(initial_visit_stack_size, true); |
0 | 2718 } |
2719 | |
2720 // accessors | |
2721 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
2722 JvmtiTagMap* tag_map() const { return _tag_map; } | |
2723 Handle initial_object() const { return _initial_object; } | |
2724 | |
2725 bool is_following_references() const { return _following_object_refs; } | |
2726 | |
2727 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
2728 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
2729 bool is_reporting_string_values() const { return _reporting_string_values; } | |
2730 | |
2731 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
2732 | |
2733 // iterate over the various object types | |
2734 inline bool iterate_over_array(oop o); | |
2735 inline bool iterate_over_type_array(oop o); | |
2736 inline bool iterate_over_class(klassOop o); | |
2737 inline bool iterate_over_object(oop o); | |
2738 | |
2739 // root collection | |
2740 inline bool collect_simple_roots(); | |
2741 inline bool collect_stack_roots(); | |
2742 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
2743 | |
2744 // visit an object | |
2745 inline bool visit(oop o); | |
2746 | |
2747 public: | |
2748 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2749 Handle initial_object, | |
2750 BasicHeapWalkContext callbacks, | |
2751 const void* user_data); | |
2752 | |
2753 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2754 Handle initial_object, | |
2755 AdvancedHeapWalkContext callbacks, | |
2756 const void* user_data); | |
2757 | |
2758 ~VM_HeapWalkOperation(); | |
2759 | |
2760 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
2761 void doit(); | |
2762 }; | |
2763 | |
2764 | |
2765 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2766 Handle initial_object, | |
2767 BasicHeapWalkContext callbacks, | |
2768 const void* user_data) { | |
2769 _is_advanced_heap_walk = false; | |
2770 _tag_map = tag_map; | |
2771 _initial_object = initial_object; | |
2772 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
2773 _reporting_primitive_fields = false; | |
2774 _reporting_primitive_array_values = false; | |
2775 _reporting_string_values = false; | |
2776 _visit_stack = create_visit_stack(); | |
2777 | |
2778 | |
2779 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2780 } | |
2781 | |
2782 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2783 Handle initial_object, | |
2784 AdvancedHeapWalkContext callbacks, | |
2785 const void* user_data) { | |
2786 _is_advanced_heap_walk = true; | |
2787 _tag_map = tag_map; | |
2788 _initial_object = initial_object; | |
2789 _following_object_refs = true; | |
2790 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
2791 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
2792 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
2793 _visit_stack = create_visit_stack(); | |
2794 | |
2795 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2796 } | |
2797 | |
2798 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
2799 if (_following_object_refs) { | |
2800 assert(_visit_stack != NULL, "checking"); | |
2801 delete _visit_stack; | |
2802 _visit_stack = NULL; | |
2803 } | |
2804 } | |
2805 | |
2806 // an array references its class and has a reference to | |
2807 // each element in the array | |
2808 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
2809 objArrayOop array = objArrayOop(o); | |
2810 if (array->klass() == Universe::systemObjArrayKlassObj()) { | |
2811 // filtered out | |
2812 return true; | |
2813 } | |
2814 | |
2815 // array reference to its class | |
2816 oop mirror = objArrayKlass::cast(array->klass())->java_mirror(); | |
2817 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
2818 return false; | |
2819 } | |
2820 | |
2821 // iterate over the array and report each reference to a | |
2822 // non-null element | |
2823 for (int index=0; index<array->length(); index++) { | |
2824 oop elem = array->obj_at(index); | |
2825 if (elem == NULL) { | |
2826 continue; | |
2827 } | |
2828 | |
2829 // report the array reference o[index] = elem | |
2830 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
2831 return false; | |
2832 } | |
2833 } | |
2834 return true; | |
2835 } | |
2836 | |
2837 // a type array references its class | |
2838 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
2839 klassOop k = o->klass(); | |
2840 oop mirror = Klass::cast(k)->java_mirror(); | |
2841 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
2842 return false; | |
2843 } | |
2844 | |
2845 // report the array contents if required | |
2846 if (is_reporting_primitive_array_values()) { | |
2847 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
2848 return false; | |
2849 } | |
2850 } | |
2851 return true; | |
2852 } | |
2853 | |
2854 // verify that a static oop field is in range | |
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2855 static inline bool verify_static_oop(instanceKlass* ik, |
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2856 oop mirror, int offset) { |
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2857 address obj_p = (address)mirror + offset; |
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2858 address start = (address)instanceMirrorKlass::start_of_static_fields(mirror); |
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2859 address end = start + (java_lang_Class::static_oop_field_count(mirror) * heapOopSize); |
0 | 2860 assert(end >= start, "sanity check"); |
2861 | |
2862 if (obj_p >= start && obj_p < end) { | |
2863 return true; | |
2864 } else { | |
2865 return false; | |
2866 } | |
2867 } | |
2868 | |
2869 // a class references its super class, interfaces, class loader, ... | |
2870 // and finally its static fields | |
2871 inline bool VM_HeapWalkOperation::iterate_over_class(klassOop k) { | |
2872 int i; | |
2873 Klass* klass = klassOop(k)->klass_part(); | |
2874 | |
2875 if (klass->oop_is_instance()) { | |
2876 instanceKlass* ik = instanceKlass::cast(k); | |
2877 | |
2878 // ignore the class if it's has been initialized yet | |
2879 if (!ik->is_linked()) { | |
2880 return true; | |
2881 } | |
2882 | |
2883 // get the java mirror | |
2884 oop mirror = klass->java_mirror(); | |
2885 | |
2886 // super (only if something more interesting than java.lang.Object) | |
2887 klassOop java_super = ik->java_super(); | |
1142 | 2888 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
0 | 2889 oop super = Klass::cast(java_super)->java_mirror(); |
2890 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { | |
2891 return false; | |
2892 } | |
2893 } | |
2894 | |
2895 // class loader | |
2896 oop cl = ik->class_loader(); | |
2897 if (cl != NULL) { | |
2898 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
2899 return false; | |
2900 } | |
2901 } | |
2902 | |
2903 // protection domain | |
2904 oop pd = ik->protection_domain(); | |
2905 if (pd != NULL) { | |
2906 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
2907 return false; | |
2908 } | |
2909 } | |
2910 | |
2911 // signers | |
2912 oop signers = ik->signers(); | |
2913 if (signers != NULL) { | |
2914 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
2915 return false; | |
2916 } | |
2917 } | |
2918 | |
2919 // references from the constant pool | |
2920 { | |
2921 const constantPoolOop pool = ik->constants(); | |
2922 for (int i = 1; i < pool->length(); i++) { | |
2923 constantTag tag = pool->tag_at(i).value(); | |
2924 if (tag.is_string() || tag.is_klass()) { | |
2925 oop entry; | |
2926 if (tag.is_string()) { | |
2927 entry = pool->resolved_string_at(i); | |
2928 assert(java_lang_String::is_instance(entry), "must be string"); | |
2929 } else { | |
2930 entry = Klass::cast(pool->resolved_klass_at(i))->java_mirror(); | |
2931 } | |
2932 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
2933 return false; | |
2934 } | |
2935 } | |
2936 } | |
2937 } | |
2938 | |
2939 // interfaces | |
2940 // (These will already have been reported as references from the constant pool | |
2941 // but are specified by IterateOverReachableObjects and must be reported). | |
2942 objArrayOop interfaces = ik->local_interfaces(); | |
2943 for (i = 0; i < interfaces->length(); i++) { | |
2944 oop interf = Klass::cast((klassOop)interfaces->obj_at(i))->java_mirror(); | |
2945 if (interf == NULL) { | |
2946 continue; | |
2947 } | |
2948 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
2949 return false; | |
2950 } | |
2951 } | |
2952 | |
2953 // iterate over the static fields | |
2954 | |
2955 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
2956 for (i=0; i<field_map->field_count(); i++) { | |
2957 ClassFieldDescriptor* field = field_map->field_at(i); | |
2958 char type = field->field_type(); | |
2959 if (!is_primitive_field_type(type)) { | |
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2960 oop fld_o = mirror->obj_field(field->field_offset()); |
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2961 assert(verify_static_oop(ik, mirror, field->field_offset()), "sanity check"); |
0 | 2962 if (fld_o != NULL) { |
2963 int slot = field->field_index(); | |
2964 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
2965 delete field_map; | |
2966 return false; | |
2967 } | |
2968 } | |
2969 } else { | |
2970 if (is_reporting_primitive_fields()) { | |
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2971 address addr = (address)mirror + field->field_offset(); |
0 | 2972 int slot = field->field_index(); |
2973 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
2974 delete field_map; | |
2975 return false; | |
2976 } | |
2977 } | |
2978 } | |
2979 } | |
2980 delete field_map; | |
2981 | |
2982 return true; | |
2983 } | |
2984 | |
2985 return true; | |
2986 } | |
2987 | |
2988 // an object references a class and its instance fields | |
2989 // (static fields are ignored here as we report these as | |
2990 // references from the class). | |
2991 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
2992 // reference to the class | |
2993 if (!CallbackInvoker::report_class_reference(o, Klass::cast(o->klass())->java_mirror())) { | |
2994 return false; | |
2995 } | |
2996 | |
2997 // iterate over instance fields | |
2998 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
2999 for (int i=0; i<field_map->field_count(); i++) { | |
3000 ClassFieldDescriptor* field = field_map->field_at(i); | |
3001 char type = field->field_type(); | |
3002 if (!is_primitive_field_type(type)) { | |
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3003 oop fld_o = o->obj_field(field->field_offset()); |
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3004 // ignore any objects that aren't visible to profiler |
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3005 if (fld_o != NULL && ServiceUtil::visible_oop(fld_o)) { |
0 | 3006 // reflection code may have a reference to a klassOop. |
3007 // - see sun.reflect.UnsafeStaticFieldAccessorImpl and sun.misc.Unsafe | |
3008 if (fld_o->is_klass()) { | |
3009 klassOop k = (klassOop)fld_o; | |
3010 fld_o = Klass::cast(k)->java_mirror(); | |
3011 } | |
3012 int slot = field->field_index(); | |
3013 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
3014 return false; | |
3015 } | |
3016 } | |
3017 } else { | |
3018 if (is_reporting_primitive_fields()) { | |
3019 // primitive instance field | |
3020 address addr = (address)o + field->field_offset(); | |
3021 int slot = field->field_index(); | |
3022 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
3023 return false; | |
3024 } | |
3025 } | |
3026 } | |
3027 } | |
3028 | |
3029 // if the object is a java.lang.String | |
3030 if (is_reporting_string_values() && | |
1142 | 3031 o->klass() == SystemDictionary::String_klass()) { |
0 | 3032 if (!CallbackInvoker::report_string_value(o)) { |
3033 return false; | |
3034 } | |
3035 } | |
3036 return true; | |
3037 } | |
3038 | |
3039 | |
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3040 // Collects all simple (non-stack) roots except for threads; |
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3041 // threads are handled in collect_stack_roots() as an optimization. |
0 | 3042 // if there's a heap root callback provided then the callback is |
3043 // invoked for each simple root. | |
3044 // if an object reference callback is provided then all simple | |
3045 // roots are pushed onto the marking stack so that they can be | |
3046 // processed later | |
3047 // | |
3048 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
3049 SimpleRootsClosure blk; | |
3050 | |
3051 // JNI globals | |
3052 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
3053 JNIHandles::oops_do(&blk); | |
3054 if (blk.stopped()) { | |
3055 return false; | |
3056 } | |
3057 | |
3058 // Preloaded classes and loader from the system dictionary | |
3059 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
3060 SystemDictionary::always_strong_oops_do(&blk); | |
3061 if (blk.stopped()) { | |
3062 return false; | |
3063 } | |
3064 | |
3065 // Inflated monitors | |
3066 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
3067 ObjectSynchronizer::oops_do(&blk); | |
3068 if (blk.stopped()) { | |
3069 return false; | |
3070 } | |
3071 | |
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3072 // threads are now handled in collect_stack_roots() |
0 | 3073 |
3074 // Other kinds of roots maintained by HotSpot | |
3075 // Many of these won't be visible but others (such as instances of important | |
3076 // exceptions) will be visible. | |
3077 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
3078 Universe::oops_do(&blk); | |
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3079 |
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3080 // If there are any non-perm roots in the code cache, visit them. |
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3081 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
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3082 CodeBlobToOopClosure look_in_blobs(&blk, false); |
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3083 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
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3084 |
0 | 3085 return true; |
3086 } | |
3087 | |
3088 // Walk the stack of a given thread and find all references (locals | |
3089 // and JNI calls) and report these as stack references | |
3090 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
3091 JNILocalRootsClosure* blk) | |
3092 { | |
3093 oop threadObj = java_thread->threadObj(); | |
3094 assert(threadObj != NULL, "sanity check"); | |
3095 | |
3096 // only need to get the thread's tag once per thread | |
3097 jlong thread_tag = tag_for(_tag_map, threadObj); | |
3098 | |
3099 // also need the thread id | |
3100 jlong tid = java_lang_Thread::thread_id(threadObj); | |
3101 | |
3102 | |
3103 if (java_thread->has_last_Java_frame()) { | |
3104 | |
3105 // vframes are resource allocated | |
3106 Thread* current_thread = Thread::current(); | |
3107 ResourceMark rm(current_thread); | |
3108 HandleMark hm(current_thread); | |
3109 | |
3110 RegisterMap reg_map(java_thread); | |
3111 frame f = java_thread->last_frame(); | |
3112 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
3113 | |
3114 bool is_top_frame = true; | |
3115 int depth = 0; | |
3116 frame* last_entry_frame = NULL; | |
3117 | |
3118 while (vf != NULL) { | |
3119 if (vf->is_java_frame()) { | |
3120 | |
3121 // java frame (interpreted, compiled, ...) | |
3122 javaVFrame *jvf = javaVFrame::cast(vf); | |
3123 | |
3124 // the jmethodID | |
3125 jmethodID method = jvf->method()->jmethod_id(); | |
3126 | |
3127 if (!(jvf->method()->is_native())) { | |
3128 jlocation bci = (jlocation)jvf->bci(); | |
3129 StackValueCollection* locals = jvf->locals(); | |
3130 for (int slot=0; slot<locals->size(); slot++) { | |
3131 if (locals->at(slot)->type() == T_OBJECT) { | |
3132 oop o = locals->obj_at(slot)(); | |
3133 if (o == NULL) { | |
3134 continue; | |
3135 } | |
3136 | |
3137 // stack reference | |
3138 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
3139 bci, slot, o)) { | |
3140 return false; | |
3141 } | |
3142 } | |
3143 } | |
3144 } else { | |
3145 blk->set_context(thread_tag, tid, depth, method); | |
3146 if (is_top_frame) { | |
3147 // JNI locals for the top frame. | |
3148 java_thread->active_handles()->oops_do(blk); | |
3149 } else { | |
3150 if (last_entry_frame != NULL) { | |
3151 // JNI locals for the entry frame | |
3152 assert(last_entry_frame->is_entry_frame(), "checking"); | |
3153 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
3154 } | |
3155 } | |
3156 } | |
3157 last_entry_frame = NULL; | |
3158 depth++; | |
3159 } else { | |
3160 // externalVFrame - for an entry frame then we report the JNI locals | |
3161 // when we find the corresponding javaVFrame | |
3162 frame* fr = vf->frame_pointer(); | |
3163 assert(fr != NULL, "sanity check"); | |
3164 if (fr->is_entry_frame()) { | |
3165 last_entry_frame = fr; | |
3166 } | |
3167 } | |
3168 | |
3169 vf = vf->sender(); | |
3170 is_top_frame = false; | |
3171 } | |
3172 } else { | |
3173 // no last java frame but there may be JNI locals | |
3174 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
3175 java_thread->active_handles()->oops_do(blk); | |
3176 } | |
3177 return true; | |
3178 } | |
3179 | |
3180 | |
3816
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6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3181 // Collects the simple roots for all threads and collects all |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3182 // stack roots - for each thread it walks the execution |
0 | 3183 // stack to find all references and local JNI refs. |
3184 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
3185 JNILocalRootsClosure blk; | |
3186 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
3187 oop threadObj = thread->threadObj(); | |
3188 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
3816
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6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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3815
diff
changeset
|
3189 // Collect the simple root for this thread before we |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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3815
diff
changeset
|
3190 // collect its stack roots |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3191 if (!CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3192 threadObj)) { |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3193 return false; |
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6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3194 } |
0 | 3195 if (!collect_stack_roots(thread, &blk)) { |
3196 return false; | |
3197 } | |
3198 } | |
3199 } | |
3200 return true; | |
3201 } | |
3202 | |
3203 // visit an object | |
3204 // first mark the object as visited | |
3205 // second get all the outbound references from this object (in other words, all | |
3206 // the objects referenced by this object). | |
3207 // | |
3208 bool VM_HeapWalkOperation::visit(oop o) { | |
3209 // mark object as visited | |
3210 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
3211 ObjectMarker::mark(o); | |
3212 | |
3213 // instance | |
3214 if (o->is_instance()) { | |
1142 | 3215 if (o->klass() == SystemDictionary::Class_klass()) { |
0 | 3216 o = klassOop_if_java_lang_Class(o); |
3217 if (o->is_klass()) { | |
3218 // a java.lang.Class | |
3219 return iterate_over_class(klassOop(o)); | |
3220 } | |
3221 } else { | |
3222 return iterate_over_object(o); | |
3223 } | |
3224 } | |
3225 | |
3226 // object array | |
3227 if (o->is_objArray()) { | |
3228 return iterate_over_array(o); | |
3229 } | |
3230 | |
3231 // type array | |
3232 if (o->is_typeArray()) { | |
3233 return iterate_over_type_array(o); | |
3234 } | |
3235 | |
3236 return true; | |
3237 } | |
3238 | |
3239 void VM_HeapWalkOperation::doit() { | |
3240 ResourceMark rm; | |
3241 ObjectMarkerController marker; | |
3242 ClassFieldMapCacheMark cm; | |
3243 | |
3244 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
3245 | |
3246 // the heap walk starts with an initial object or the heap roots | |
3247 if (initial_object().is_null()) { | |
3815 | 3248 // If either collect_stack_roots() or collect_simple_roots() |
3249 // returns false at this point, then there are no mark bits | |
3250 // to reset. | |
3251 ObjectMarker::set_needs_reset(false); | |
3252 | |
3816
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6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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3815
diff
changeset
|
3253 // Calling collect_stack_roots() before collect_simple_roots() |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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3815
diff
changeset
|
3254 // can result in a big performance boost for an agent that is |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
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diff
changeset
|
3255 // focused on analyzing references in the thread stacks. |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3256 if (!collect_stack_roots()) return; |
88dce6a60ac8
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3815
diff
changeset
|
3257 |
0 | 3258 if (!collect_simple_roots()) return; |
3815 | 3259 |
3260 // no early return so enable heap traversal to reset the mark bits | |
3261 ObjectMarker::set_needs_reset(true); | |
0 | 3262 } else { |
3263 visit_stack()->push(initial_object()()); | |
3264 } | |
3265 | |
3266 // object references required | |
3267 if (is_following_references()) { | |
3268 | |
3269 // visit each object until all reachable objects have been | |
3270 // visited or the callback asked to terminate the iteration. | |
3271 while (!visit_stack()->is_empty()) { | |
3272 oop o = visit_stack()->pop(); | |
3273 if (!ObjectMarker::visited(o)) { | |
3274 if (!visit(o)) { | |
3275 break; | |
3276 } | |
3277 } | |
3278 } | |
3279 } | |
3280 } | |
3281 | |
3282 // iterate over all objects that are reachable from a set of roots | |
3283 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
3284 jvmtiStackReferenceCallback stack_ref_callback, | |
3285 jvmtiObjectReferenceCallback object_ref_callback, | |
3286 const void* user_data) { | |
3287 MutexLocker ml(Heap_lock); | |
3288 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
3289 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
3290 VMThread::execute(&op); | |
3291 } | |
3292 | |
3293 // iterate over all objects that are reachable from a given object | |
3294 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
3295 jvmtiObjectReferenceCallback object_ref_callback, | |
3296 const void* user_data) { | |
3297 oop obj = JNIHandles::resolve(object); | |
3298 Handle initial_object(Thread::current(), obj); | |
3299 | |
3300 MutexLocker ml(Heap_lock); | |
3301 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
3302 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3303 VMThread::execute(&op); | |
3304 } | |
3305 | |
3306 // follow references from an initial object or the GC roots | |
3307 void JvmtiTagMap::follow_references(jint heap_filter, | |
3308 KlassHandle klass, | |
3309 jobject object, | |
3310 const jvmtiHeapCallbacks* callbacks, | |
3311 const void* user_data) | |
3312 { | |
3313 oop obj = JNIHandles::resolve(object); | |
3314 Handle initial_object(Thread::current(), obj); | |
3315 | |
3316 MutexLocker ml(Heap_lock); | |
3317 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
3318 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3319 VMThread::execute(&op); | |
3320 } | |
3321 | |
3322 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
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3323 void JvmtiTagMap::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) { |
2145
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3324 // No locks during VM bring-up (0 threads) and no safepoints after main |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3325 // thread creation and before VMThread creation (1 thread); initial GC |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3326 // verification can happen in that window which gets to here. |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3327 assert(Threads::number_of_threads() <= 1 || |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3328 SafepointSynchronize::is_at_safepoint(), |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3329 "must be executed at a safepoint"); |
0 | 3330 if (JvmtiEnv::environments_might_exist()) { |
3331 JvmtiEnvIterator it; | |
3332 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
3333 JvmtiTagMap* tag_map = env->tag_map(); | |
3334 if (tag_map != NULL && !tag_map->is_empty()) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
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diff
changeset
|
3335 tag_map->do_weak_oops(is_alive, f); |
0 | 3336 } |
3337 } | |
3338 } | |
3339 } | |
3340 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3341 void JvmtiTagMap::do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f) { |
0 | 3342 |
3343 // does this environment have the OBJECT_FREE event enabled | |
3344 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
3345 | |
3346 // counters used for trace message | |
3347 int freed = 0; | |
3348 int moved = 0; | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3349 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3350 JvmtiTagHashmap* hashmap = this->hashmap(); |
0 | 3351 |
3352 // reenable sizing (if disabled) | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3353 hashmap->set_resizing_enabled(true); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3354 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3355 // if the hashmap is empty then we can skip it |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3356 if (hashmap->_entry_count == 0) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3357 return; |
0 | 3358 } |
3359 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3360 // now iterate through each entry in the table |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3361 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3362 JvmtiTagHashmapEntry** table = hashmap->table(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3363 int size = hashmap->size(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3364 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3365 JvmtiTagHashmapEntry* delayed_add = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3366 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3367 for (int pos = 0; pos < size; ++pos) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3368 JvmtiTagHashmapEntry* entry = table[pos]; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3369 JvmtiTagHashmapEntry* prev = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3370 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3371 while (entry != NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3372 JvmtiTagHashmapEntry* next = entry->next(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3373 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3374 oop* obj = entry->object_addr(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3375 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3376 // has object been GC'ed |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3377 if (!is_alive->do_object_b(entry->object())) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3378 // grab the tag |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3379 jlong tag = entry->tag(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3380 guarantee(tag != 0, "checking"); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3381 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3382 // remove GC'ed entry from hashmap and return the |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3383 // entry to the free list |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3384 hashmap->remove(prev, pos, entry); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3385 destroy_entry(entry); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3386 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3387 // post the event to the profiler |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3388 if (post_object_free) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3389 JvmtiExport::post_object_free(env(), tag); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3390 } |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3391 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3392 ++freed; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3393 } else { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3394 f->do_oop(entry->object_addr()); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3395 oop new_oop = entry->object(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3396 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3397 // if the object has moved then re-hash it and move its |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3398 // entry to its new location. |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3399 unsigned int new_pos = JvmtiTagHashmap::hash(new_oop, size); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3400 if (new_pos != (unsigned int)pos) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3401 if (prev == NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3402 table[pos] = next; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3403 } else { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3404 prev->set_next(next); |
0 | 3405 } |
2125
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3406 if (new_pos < (unsigned int)pos) { |
0 | 3407 entry->set_next(table[new_pos]); |
3408 table[new_pos] = entry; | |
3409 } else { | |
2125
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diff
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|
3410 // Delay adding this entry to it's new position as we'd end up |
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parents:
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diff
changeset
|
3411 // hitting it again during this iteration. |
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parents:
1972
diff
changeset
|
3412 entry->set_next(delayed_add); |
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1972
diff
changeset
|
3413 delayed_add = entry; |
0 | 3414 } |
2125
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changeset
|
3415 moved++; |
0 | 3416 } else { |
2125
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diff
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|
3417 // object didn't move |
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parents:
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diff
changeset
|
3418 prev = entry; |
0 | 3419 } |
3420 } | |
2125
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|
3421 |
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diff
changeset
|
3422 entry = next; |
0 | 3423 } |
3424 } | |
3425 | |
2125
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|
3426 // Re-add all the entries which were kept aside |
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kamg
parents:
1972
diff
changeset
|
3427 while (delayed_add != NULL) { |
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kamg
parents:
1972
diff
changeset
|
3428 JvmtiTagHashmapEntry* next = delayed_add->next(); |
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kamg
parents:
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diff
changeset
|
3429 unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size); |
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kamg
parents:
1972
diff
changeset
|
3430 delayed_add->set_next(table[pos]); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3431 table[pos] = delayed_add; |
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kamg
parents:
1972
diff
changeset
|
3432 delayed_add = next; |
0 | 3433 } |
3434 | |
3435 // stats | |
3436 if (TraceJVMTIObjectTagging) { | |
2125
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diff
changeset
|
3437 int post_total = hashmap->_entry_count; |
0 | 3438 int pre_total = post_total + freed; |
3439 | |
2125
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diff
changeset
|
3440 tty->print_cr("(%d->%d, %d freed, %d total moves)", |
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kamg
parents:
1972
diff
changeset
|
3441 pre_total, post_total, freed, moved); |
0 | 3442 } |
3443 } |