Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiTagMap.cpp @ 8071:bbc7936779f9
8006398: Add regression tests for deprectated GCs
Reviewed-by: ehelin, jwilhelm, jmasa
author | brutisso |
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date | Thu, 14 Feb 2013 09:11:43 +0100 |
parents | db9981fd3124 |
children | 746b070f5022 |
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" | |
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48 #include "utilities/macros.hpp" |
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49 #if INCLUDE_ALL_GCS |
1972 | 50 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
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51 #endif // INCLUDE_ALL_GCS |
0 | 52 |
53 // JvmtiTagHashmapEntry | |
54 // | |
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55 // Each entry encapsulates a reference to the tagged object |
0 | 56 // and the tag value. In addition an entry includes a next pointer which |
57 // is used to chain entries together. | |
58 | |
6197 | 59 class JvmtiTagHashmapEntry : public CHeapObj<mtInternal> { |
0 | 60 private: |
61 friend class JvmtiTagMap; | |
62 | |
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63 oop _object; // tagged object |
0 | 64 jlong _tag; // the tag |
65 JvmtiTagHashmapEntry* _next; // next on the list | |
66 | |
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67 inline void init(oop object, jlong tag) { |
0 | 68 _object = object; |
69 _tag = tag; | |
70 _next = NULL; | |
71 } | |
72 | |
73 // constructor | |
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74 JvmtiTagHashmapEntry(oop object, jlong tag) { init(object, tag); } |
0 | 75 |
76 public: | |
77 | |
78 // accessor methods | |
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79 inline oop object() const { return _object; } |
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80 inline oop* object_addr() { return &_object; } |
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81 inline jlong tag() const { return _tag; } |
0 | 82 |
83 inline void set_tag(jlong tag) { | |
84 assert(tag != 0, "can't be zero"); | |
85 _tag = tag; | |
86 } | |
87 | |
88 inline JvmtiTagHashmapEntry* next() const { return _next; } | |
89 inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; } | |
90 }; | |
91 | |
92 | |
93 // JvmtiTagHashmap | |
94 // | |
95 // A hashmap is essentially a table of pointers to entries. Entries | |
96 // are hashed to a location, or position in the table, and then | |
97 // chained from that location. The "key" for hashing is address of | |
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98 // the object, or oop. The "value" is the tag value. |
0 | 99 // |
100 // A hashmap maintains a count of the number entries in the hashmap | |
101 // and resizes if the number of entries exceeds a given threshold. | |
102 // The threshold is specified as a percentage of the size - for | |
103 // example a threshold of 0.75 will trigger the hashmap to resize | |
104 // if the number of entries is >75% of table size. | |
105 // | |
106 // A hashmap provides functions for adding, removing, and finding | |
107 // entries. It also provides a function to iterate over all entries | |
108 // in the hashmap. | |
109 | |
6197 | 110 class JvmtiTagHashmap : public CHeapObj<mtInternal> { |
0 | 111 private: |
112 friend class JvmtiTagMap; | |
113 | |
114 enum { | |
115 small_trace_threshold = 10000, // threshold for tracing | |
116 medium_trace_threshold = 100000, | |
117 large_trace_threshold = 1000000, | |
118 initial_trace_threshold = small_trace_threshold | |
119 }; | |
120 | |
121 static int _sizes[]; // array of possible hashmap sizes | |
122 int _size; // actual size of the table | |
123 int _size_index; // index into size table | |
124 | |
125 int _entry_count; // number of entries in the hashmap | |
126 | |
127 float _load_factor; // load factor as a % of the size | |
128 int _resize_threshold; // computed threshold to trigger resizing. | |
129 bool _resizing_enabled; // indicates if hashmap can resize | |
130 | |
131 int _trace_threshold; // threshold for trace messages | |
132 | |
133 JvmtiTagHashmapEntry** _table; // the table of entries. | |
134 | |
135 // private accessors | |
136 int resize_threshold() const { return _resize_threshold; } | |
137 int trace_threshold() const { return _trace_threshold; } | |
138 | |
139 // initialize the hashmap | |
140 void init(int size_index=0, float load_factor=4.0f) { | |
141 int initial_size = _sizes[size_index]; | |
142 _size_index = size_index; | |
143 _size = initial_size; | |
144 _entry_count = 0; | |
145 if (TraceJVMTIObjectTagging) { | |
146 _trace_threshold = initial_trace_threshold; | |
147 } else { | |
148 _trace_threshold = -1; | |
149 } | |
150 _load_factor = load_factor; | |
151 _resize_threshold = (int)(_load_factor * _size); | |
152 _resizing_enabled = true; | |
153 size_t s = initial_size * sizeof(JvmtiTagHashmapEntry*); | |
6197 | 154 _table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
0 | 155 if (_table == NULL) { |
156 vm_exit_out_of_memory(s, "unable to allocate initial hashtable for jvmti object tags"); | |
157 } | |
158 for (int i=0; i<initial_size; i++) { | |
159 _table[i] = NULL; | |
160 } | |
161 } | |
162 | |
163 // hash a given key (oop) with the specified size | |
164 static unsigned int hash(oop key, int size) { | |
165 // shift right to get better distribution (as these bits will be zero | |
166 // with aligned addresses) | |
167 unsigned int addr = (unsigned int)((intptr_t)key); | |
168 #ifdef _LP64 | |
169 return (addr >> 3) % size; | |
170 #else | |
171 return (addr >> 2) % size; | |
172 #endif | |
173 } | |
174 | |
175 // hash a given key (oop) | |
176 unsigned int hash(oop key) { | |
177 return hash(key, _size); | |
178 } | |
179 | |
180 // resize the hashmap - allocates a large table and re-hashes | |
181 // all entries into the new table. | |
182 void resize() { | |
183 int new_size_index = _size_index+1; | |
184 int new_size = _sizes[new_size_index]; | |
185 if (new_size < 0) { | |
186 // hashmap already at maximum capacity | |
187 return; | |
188 } | |
189 | |
190 // allocate new table | |
191 size_t s = new_size * sizeof(JvmtiTagHashmapEntry*); | |
6197 | 192 JvmtiTagHashmapEntry** new_table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
0 | 193 if (new_table == NULL) { |
194 warning("unable to allocate larger hashtable for jvmti object tags"); | |
195 set_resizing_enabled(false); | |
196 return; | |
197 } | |
198 | |
199 // initialize new table | |
200 int i; | |
201 for (i=0; i<new_size; i++) { | |
202 new_table[i] = NULL; | |
203 } | |
204 | |
205 // rehash all entries into the new table | |
206 for (i=0; i<_size; i++) { | |
207 JvmtiTagHashmapEntry* entry = _table[i]; | |
208 while (entry != NULL) { | |
209 JvmtiTagHashmapEntry* next = entry->next(); | |
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210 oop key = entry->object(); |
0 | 211 assert(key != NULL, "jni weak reference cleared!!"); |
212 unsigned int h = hash(key, new_size); | |
213 JvmtiTagHashmapEntry* anchor = new_table[h]; | |
214 if (anchor == NULL) { | |
215 new_table[h] = entry; | |
216 entry->set_next(NULL); | |
217 } else { | |
218 entry->set_next(anchor); | |
219 new_table[h] = entry; | |
220 } | |
221 entry = next; | |
222 } | |
223 } | |
224 | |
225 // free old table and update settings. | |
226 os::free((void*)_table); | |
227 _table = new_table; | |
228 _size_index = new_size_index; | |
229 _size = new_size; | |
230 | |
231 // compute new resize threshold | |
232 _resize_threshold = (int)(_load_factor * _size); | |
233 } | |
234 | |
235 | |
236 // internal remove function - remove an entry at a given position in the | |
237 // table. | |
238 inline void remove(JvmtiTagHashmapEntry* prev, int pos, JvmtiTagHashmapEntry* entry) { | |
239 assert(pos >= 0 && pos < _size, "out of range"); | |
240 if (prev == NULL) { | |
241 _table[pos] = entry->next(); | |
242 } else { | |
243 prev->set_next(entry->next()); | |
244 } | |
245 assert(_entry_count > 0, "checking"); | |
246 _entry_count--; | |
247 } | |
248 | |
249 // resizing switch | |
250 bool is_resizing_enabled() const { return _resizing_enabled; } | |
251 void set_resizing_enabled(bool enable) { _resizing_enabled = enable; } | |
252 | |
253 // debugging | |
254 void print_memory_usage(); | |
255 void compute_next_trace_threshold(); | |
256 | |
257 public: | |
258 | |
259 // create a JvmtiTagHashmap of a preferred size and optionally a load factor. | |
260 // The preferred size is rounded down to an actual size. | |
261 JvmtiTagHashmap(int size, float load_factor=0.0f) { | |
262 int i=0; | |
263 while (_sizes[i] < size) { | |
264 if (_sizes[i] < 0) { | |
265 assert(i > 0, "sanity check"); | |
266 i--; | |
267 break; | |
268 } | |
269 i++; | |
270 } | |
271 | |
272 // if a load factor is specified then use it, otherwise use default | |
273 if (load_factor > 0.01f) { | |
274 init(i, load_factor); | |
275 } else { | |
276 init(i); | |
277 } | |
278 } | |
279 | |
280 // create a JvmtiTagHashmap with default settings | |
281 JvmtiTagHashmap() { | |
282 init(); | |
283 } | |
284 | |
285 // release table when JvmtiTagHashmap destroyed | |
286 ~JvmtiTagHashmap() { | |
287 if (_table != NULL) { | |
288 os::free((void*)_table); | |
289 _table = NULL; | |
290 } | |
291 } | |
292 | |
293 // accessors | |
294 int size() const { return _size; } | |
295 JvmtiTagHashmapEntry** table() const { return _table; } | |
296 int entry_count() const { return _entry_count; } | |
297 | |
298 // find an entry in the hashmap, returns NULL if not found. | |
299 inline JvmtiTagHashmapEntry* find(oop key) { | |
300 unsigned int h = hash(key); | |
301 JvmtiTagHashmapEntry* entry = _table[h]; | |
302 while (entry != NULL) { | |
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303 if (entry->object() == key) { |
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304 return entry; |
0 | 305 } |
306 entry = entry->next(); | |
307 } | |
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308 return NULL; |
0 | 309 } |
310 | |
311 | |
312 // add a new entry to hashmap | |
313 inline void add(oop key, JvmtiTagHashmapEntry* entry) { | |
314 assert(key != NULL, "checking"); | |
315 assert(find(key) == NULL, "duplicate detected"); | |
316 unsigned int h = hash(key); | |
317 JvmtiTagHashmapEntry* anchor = _table[h]; | |
318 if (anchor == NULL) { | |
319 _table[h] = entry; | |
320 entry->set_next(NULL); | |
321 } else { | |
322 entry->set_next(anchor); | |
323 _table[h] = entry; | |
324 } | |
325 | |
326 _entry_count++; | |
327 if (trace_threshold() > 0 && entry_count() >= trace_threshold()) { | |
328 assert(TraceJVMTIObjectTagging, "should only get here when tracing"); | |
329 print_memory_usage(); | |
330 compute_next_trace_threshold(); | |
331 } | |
332 | |
333 // if the number of entries exceed the threshold then resize | |
334 if (entry_count() > resize_threshold() && is_resizing_enabled()) { | |
335 resize(); | |
336 } | |
337 } | |
338 | |
339 // remove an entry with the given key. | |
340 inline JvmtiTagHashmapEntry* remove(oop key) { | |
341 unsigned int h = hash(key); | |
342 JvmtiTagHashmapEntry* entry = _table[h]; | |
343 JvmtiTagHashmapEntry* prev = NULL; | |
344 while (entry != NULL) { | |
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345 if (key == entry->object()) { |
0 | 346 break; |
347 } | |
348 prev = entry; | |
349 entry = entry->next(); | |
350 } | |
351 if (entry != NULL) { | |
352 remove(prev, h, entry); | |
353 } | |
354 return entry; | |
355 } | |
356 | |
357 // iterate over all entries in the hashmap | |
358 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); | |
359 }; | |
360 | |
361 // possible hashmap sizes - odd primes that roughly double in size. | |
362 // To avoid excessive resizing the odd primes from 4801-76831 and | |
363 // 76831-307261 have been removed. The list must be terminated by -1. | |
364 int JvmtiTagHashmap::_sizes[] = { 4801, 76831, 307261, 614563, 1228891, | |
365 2457733, 4915219, 9830479, 19660831, 39321619, 78643219, -1 }; | |
366 | |
367 | |
368 // A supporting class for iterating over all entries in Hashmap | |
369 class JvmtiTagHashmapEntryClosure { | |
370 public: | |
371 virtual void do_entry(JvmtiTagHashmapEntry* entry) = 0; | |
372 }; | |
373 | |
374 | |
375 // iterate over all entries in the hashmap | |
376 void JvmtiTagHashmap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
377 for (int i=0; i<_size; i++) { | |
378 JvmtiTagHashmapEntry* entry = _table[i]; | |
379 JvmtiTagHashmapEntry* prev = NULL; | |
380 while (entry != NULL) { | |
381 // obtain the next entry before invoking do_entry - this is | |
382 // necessary because do_entry may remove the entry from the | |
383 // hashmap. | |
384 JvmtiTagHashmapEntry* next = entry->next(); | |
385 closure->do_entry(entry); | |
386 entry = next; | |
387 } | |
388 } | |
389 } | |
390 | |
391 // debugging | |
392 void JvmtiTagHashmap::print_memory_usage() { | |
393 intptr_t p = (intptr_t)this; | |
394 tty->print("[JvmtiTagHashmap @ " INTPTR_FORMAT, p); | |
395 | |
396 // table + entries in KB | |
397 int hashmap_usage = (size()*sizeof(JvmtiTagHashmapEntry*) + | |
398 entry_count()*sizeof(JvmtiTagHashmapEntry))/K; | |
399 | |
400 int weak_globals_usage = (int)(JNIHandles::weak_global_handle_memory_usage()/K); | |
401 tty->print_cr(", %d entries (%d KB) <JNI weak globals: %d KB>]", | |
402 entry_count(), hashmap_usage, weak_globals_usage); | |
403 } | |
404 | |
405 // compute threshold for the next trace message | |
406 void JvmtiTagHashmap::compute_next_trace_threshold() { | |
407 if (trace_threshold() < medium_trace_threshold) { | |
408 _trace_threshold += small_trace_threshold; | |
409 } else { | |
410 if (trace_threshold() < large_trace_threshold) { | |
411 _trace_threshold += medium_trace_threshold; | |
412 } else { | |
413 _trace_threshold += large_trace_threshold; | |
414 } | |
415 } | |
416 } | |
417 | |
418 // create a JvmtiTagMap | |
419 JvmtiTagMap::JvmtiTagMap(JvmtiEnv* env) : | |
420 _env(env), | |
421 _lock(Mutex::nonleaf+2, "JvmtiTagMap._lock", false), | |
422 _free_entries(NULL), | |
423 _free_entries_count(0) | |
424 { | |
425 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
426 assert(((JvmtiEnvBase *)env)->tag_map() == NULL, "tag map already exists for environment"); | |
427 | |
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428 _hashmap = new JvmtiTagHashmap(); |
0 | 429 |
430 // finally add us to the environment | |
431 ((JvmtiEnvBase *)env)->set_tag_map(this); | |
432 } | |
433 | |
434 | |
435 // destroy a JvmtiTagMap | |
436 JvmtiTagMap::~JvmtiTagMap() { | |
437 | |
438 // no lock acquired as we assume the enclosing environment is | |
439 // also being destroryed. | |
440 ((JvmtiEnvBase *)_env)->set_tag_map(NULL); | |
441 | |
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442 JvmtiTagHashmapEntry** table = _hashmap->table(); |
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443 for (int j = 0; j < _hashmap->size(); j++) { |
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444 JvmtiTagHashmapEntry* entry = table[j]; |
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445 while (entry != NULL) { |
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446 JvmtiTagHashmapEntry* next = entry->next(); |
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447 delete entry; |
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448 entry = next; |
0 | 449 } |
450 } | |
451 | |
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452 // finally destroy the hashmap |
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453 delete _hashmap; |
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454 _hashmap = NULL; |
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455 |
0 | 456 // remove any entries on the free list |
457 JvmtiTagHashmapEntry* entry = _free_entries; | |
458 while (entry != NULL) { | |
459 JvmtiTagHashmapEntry* next = entry->next(); | |
460 delete entry; | |
461 entry = next; | |
462 } | |
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463 _free_entries = NULL; |
0 | 464 } |
465 | |
466 // create a hashmap entry | |
467 // - if there's an entry on the (per-environment) free list then this | |
468 // is returned. Otherwise an new entry is allocated. | |
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469 JvmtiTagHashmapEntry* JvmtiTagMap::create_entry(oop ref, jlong tag) { |
0 | 470 assert(Thread::current()->is_VM_thread() || is_locked(), "checking"); |
471 JvmtiTagHashmapEntry* entry; | |
472 if (_free_entries == NULL) { | |
473 entry = new JvmtiTagHashmapEntry(ref, tag); | |
474 } else { | |
475 assert(_free_entries_count > 0, "mismatched _free_entries_count"); | |
476 _free_entries_count--; | |
477 entry = _free_entries; | |
478 _free_entries = entry->next(); | |
479 entry->init(ref, tag); | |
480 } | |
481 return entry; | |
482 } | |
483 | |
484 // destroy an entry by returning it to the free list | |
485 void JvmtiTagMap::destroy_entry(JvmtiTagHashmapEntry* entry) { | |
486 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
487 // limit the size of the free list | |
488 if (_free_entries_count >= max_free_entries) { | |
489 delete entry; | |
490 } else { | |
491 entry->set_next(_free_entries); | |
492 _free_entries = entry; | |
493 _free_entries_count++; | |
494 } | |
495 } | |
496 | |
497 // returns the tag map for the given environments. If the tag map | |
498 // doesn't exist then it is created. | |
499 JvmtiTagMap* JvmtiTagMap::tag_map_for(JvmtiEnv* env) { | |
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500 JvmtiTagMap* tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 501 if (tag_map == NULL) { |
502 MutexLocker mu(JvmtiThreadState_lock); | |
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503 tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 504 if (tag_map == NULL) { |
505 tag_map = new JvmtiTagMap(env); | |
506 } | |
507 } else { | |
508 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
509 } | |
510 return tag_map; | |
511 } | |
512 | |
513 // iterate over all entries in the tag map. | |
514 void JvmtiTagMap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
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515 hashmap()->entry_iterate(closure); |
0 | 516 } |
517 | |
518 // returns true if the hashmaps are empty | |
519 bool JvmtiTagMap::is_empty() { | |
520 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
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521 return hashmap()->entry_count() == 0; |
0 | 522 } |
523 | |
524 | |
525 // Return the tag value for an object, or 0 if the object is | |
526 // not tagged | |
527 // | |
528 static inline jlong tag_for(JvmtiTagMap* tag_map, oop o) { | |
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529 JvmtiTagHashmapEntry* entry = tag_map->hashmap()->find(o); |
0 | 530 if (entry == NULL) { |
531 return 0; | |
532 } else { | |
533 return entry->tag(); | |
534 } | |
535 } | |
536 | |
537 | |
538 // A CallbackWrapper is a support class for querying and tagging an object | |
539 // around a callback to a profiler. The constructor does pre-callback | |
540 // work to get the tag value, klass tag value, ... and the destructor | |
541 // does the post-callback work of tagging or untagging the object. | |
542 // | |
543 // { | |
544 // CallbackWrapper wrapper(tag_map, o); | |
545 // | |
546 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
547 // | |
548 // } // wrapper goes out of scope here which results in the destructor | |
549 // checking to see if the object has been tagged, untagged, or the | |
550 // tag value has changed. | |
551 // | |
552 class CallbackWrapper : public StackObj { | |
553 private: | |
554 JvmtiTagMap* _tag_map; | |
555 JvmtiTagHashmap* _hashmap; | |
556 JvmtiTagHashmapEntry* _entry; | |
557 oop _o; | |
558 jlong _obj_size; | |
559 jlong _obj_tag; | |
560 jlong _klass_tag; | |
561 | |
562 protected: | |
563 JvmtiTagMap* tag_map() const { return _tag_map; } | |
564 | |
565 // invoked post-callback to tag, untag, or update the tag of an object | |
566 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
567 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
568 public: | |
569 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
570 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
571 "MT unsafe or must be VM thread"); | |
572 | |
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573 // object to tag |
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574 _o = o; |
0 | 575 |
576 // object size | |
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577 _obj_size = (jlong)_o->size() * wordSize; |
0 | 578 |
579 // record the context | |
580 _tag_map = tag_map; | |
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581 _hashmap = tag_map->hashmap(); |
0 | 582 _entry = _hashmap->find(_o); |
583 | |
584 // get object tag | |
585 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
586 | |
587 // get the class and the class's tag value | |
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588 assert(SystemDictionary::Class_klass()->oop_is_instanceMirror(), "Is not?"); |
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589 |
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590 _klass_tag = tag_for(tag_map, _o->klass()->java_mirror()); |
0 | 591 } |
592 | |
593 ~CallbackWrapper() { | |
594 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
595 } | |
596 | |
597 inline jlong* obj_tag_p() { return &_obj_tag; } | |
598 inline jlong obj_size() const { return _obj_size; } | |
599 inline jlong obj_tag() const { return _obj_tag; } | |
600 inline jlong klass_tag() const { return _klass_tag; } | |
601 }; | |
602 | |
603 | |
604 | |
605 // callback post-callback to tag, untag, or update the tag of an object | |
606 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
607 JvmtiTagHashmap* hashmap, | |
608 JvmtiTagHashmapEntry* entry, | |
609 jlong obj_tag) { | |
610 if (entry == NULL) { | |
611 if (obj_tag != 0) { | |
612 // callback has tagged the object | |
613 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
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614 entry = tag_map()->create_entry(o, obj_tag); |
0 | 615 hashmap->add(o, entry); |
616 } | |
617 } else { | |
618 // object was previously tagged - the callback may have untagged | |
619 // the object or changed the tag value | |
620 if (obj_tag == 0) { | |
621 | |
622 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
623 assert(entry_removed == entry, "checking"); | |
624 tag_map()->destroy_entry(entry); | |
625 | |
626 } else { | |
627 if (obj_tag != entry->tag()) { | |
628 entry->set_tag(obj_tag); | |
629 } | |
630 } | |
631 } | |
632 } | |
633 | |
634 // An extended CallbackWrapper used when reporting an object reference | |
635 // to the agent. | |
636 // | |
637 // { | |
638 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
639 // | |
640 // (*callback)(wrapper.klass_tag(), | |
641 // wrapper.obj_size(), | |
642 // wrapper.obj_tag_p() | |
643 // wrapper.referrer_tag_p(), ...) | |
644 // | |
645 // } // wrapper goes out of scope here which results in the destructor | |
646 // checking to see if the referrer object has been tagged, untagged, | |
647 // or the tag value has changed. | |
648 // | |
649 class TwoOopCallbackWrapper : public CallbackWrapper { | |
650 private: | |
651 bool _is_reference_to_self; | |
652 JvmtiTagHashmap* _referrer_hashmap; | |
653 JvmtiTagHashmapEntry* _referrer_entry; | |
654 oop _referrer; | |
655 jlong _referrer_obj_tag; | |
656 jlong _referrer_klass_tag; | |
657 jlong* _referrer_tag_p; | |
658 | |
659 bool is_reference_to_self() const { return _is_reference_to_self; } | |
660 | |
661 public: | |
662 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
663 CallbackWrapper(tag_map, o) | |
664 { | |
665 // self reference needs to be handled in a special way | |
666 _is_reference_to_self = (referrer == o); | |
667 | |
668 if (_is_reference_to_self) { | |
669 _referrer_klass_tag = klass_tag(); | |
670 _referrer_tag_p = obj_tag_p(); | |
671 } else { | |
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672 _referrer = referrer; |
0 | 673 // record the context |
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674 _referrer_hashmap = tag_map->hashmap(); |
0 | 675 _referrer_entry = _referrer_hashmap->find(_referrer); |
676 | |
677 // get object tag | |
678 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
679 _referrer_tag_p = &_referrer_obj_tag; | |
680 | |
681 // get referrer class tag. | |
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682 _referrer_klass_tag = tag_for(tag_map, _referrer->klass()->java_mirror()); |
0 | 683 } |
684 } | |
685 | |
686 ~TwoOopCallbackWrapper() { | |
687 if (!is_reference_to_self()){ | |
688 post_callback_tag_update(_referrer, | |
689 _referrer_hashmap, | |
690 _referrer_entry, | |
691 _referrer_obj_tag); | |
692 } | |
693 } | |
694 | |
695 // address of referrer tag | |
696 // (for a self reference this will return the same thing as obj_tag_p()) | |
697 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
698 | |
699 // referrer's class tag | |
700 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
701 }; | |
702 | |
703 // tag an object | |
704 // | |
705 // This function is performance critical. If many threads attempt to tag objects | |
706 // around the same time then it's possible that the Mutex associated with the | |
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707 // tag map will be a hot lock. |
0 | 708 void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
709 MutexLocker ml(lock()); | |
710 | |
711 // resolve the object | |
712 oop o = JNIHandles::resolve_non_null(object); | |
713 | |
714 // see if the object is already tagged | |
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715 JvmtiTagHashmap* hashmap = _hashmap; |
0 | 716 JvmtiTagHashmapEntry* entry = hashmap->find(o); |
717 | |
718 // if the object is not already tagged then we tag it | |
719 if (entry == NULL) { | |
720 if (tag != 0) { | |
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721 entry = create_entry(o, tag); |
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722 hashmap->add(o, entry); |
0 | 723 } else { |
724 // no-op | |
725 } | |
726 } else { | |
727 // if the object is already tagged then we either update | |
728 // the tag (if a new tag value has been provided) | |
729 // or remove the object if the new tag value is 0. | |
730 if (tag == 0) { | |
731 hashmap->remove(o); | |
732 destroy_entry(entry); | |
733 } else { | |
734 entry->set_tag(tag); | |
735 } | |
736 } | |
737 } | |
738 | |
739 // get the tag for an object | |
740 jlong JvmtiTagMap::get_tag(jobject object) { | |
741 MutexLocker ml(lock()); | |
742 | |
743 // resolve the object | |
744 oop o = JNIHandles::resolve_non_null(object); | |
745 | |
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746 return tag_for(this, o); |
0 | 747 } |
748 | |
749 | |
750 // Helper class used to describe the static or instance fields of a class. | |
751 // For each field it holds the field index (as defined by the JVMTI specification), | |
752 // the field type, and the offset. | |
753 | |
6197 | 754 class ClassFieldDescriptor: public CHeapObj<mtInternal> { |
0 | 755 private: |
756 int _field_index; | |
757 int _field_offset; | |
758 char _field_type; | |
759 public: | |
760 ClassFieldDescriptor(int index, char type, int offset) : | |
761 _field_index(index), _field_type(type), _field_offset(offset) { | |
762 } | |
763 int field_index() const { return _field_index; } | |
764 char field_type() const { return _field_type; } | |
765 int field_offset() const { return _field_offset; } | |
766 }; | |
767 | |
6197 | 768 class ClassFieldMap: public CHeapObj<mtInternal> { |
0 | 769 private: |
770 enum { | |
771 initial_field_count = 5 | |
772 }; | |
773 | |
774 // list of field descriptors | |
775 GrowableArray<ClassFieldDescriptor*>* _fields; | |
776 | |
777 // constructor | |
778 ClassFieldMap(); | |
779 | |
780 // add a field | |
781 void add(int index, char type, int offset); | |
782 | |
783 // returns the field count for the given class | |
784 static int compute_field_count(instanceKlassHandle ikh); | |
785 | |
786 public: | |
787 ~ClassFieldMap(); | |
788 | |
789 // access | |
790 int field_count() { return _fields->length(); } | |
791 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
792 | |
793 // functions to create maps of static or instance fields | |
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794 static ClassFieldMap* create_map_of_static_fields(Klass* k); |
0 | 795 static ClassFieldMap* create_map_of_instance_fields(oop obj); |
796 }; | |
797 | |
798 ClassFieldMap::ClassFieldMap() { | |
6197 | 799 _fields = new (ResourceObj::C_HEAP, mtInternal) |
800 GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
0 | 801 } |
802 | |
803 ClassFieldMap::~ClassFieldMap() { | |
804 for (int i=0; i<_fields->length(); i++) { | |
805 delete _fields->at(i); | |
806 } | |
807 delete _fields; | |
808 } | |
809 | |
810 void ClassFieldMap::add(int index, char type, int offset) { | |
811 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
812 _fields->append(field); | |
813 } | |
814 | |
815 // Returns a heap allocated ClassFieldMap to describe the static fields | |
816 // of the given class. | |
817 // | |
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818 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(Klass* k) { |
0 | 819 HandleMark hm; |
820 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
821 | |
822 // create the field map | |
823 ClassFieldMap* field_map = new ClassFieldMap(); | |
824 | |
825 FilteredFieldStream f(ikh, false, false); | |
826 int max_field_index = f.field_count()-1; | |
827 | |
828 int index = 0; | |
829 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
830 // ignore instance fields | |
831 if (!fld.access_flags().is_static()) { | |
832 continue; | |
833 } | |
834 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
835 } | |
836 return field_map; | |
837 } | |
838 | |
839 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
840 // of the given class. All instance fields are included (this means public | |
841 // and private fields declared in superclasses and superinterfaces too). | |
842 // | |
843 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
844 HandleMark hm; | |
845 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
846 | |
847 // create the field map | |
848 ClassFieldMap* field_map = new ClassFieldMap(); | |
849 | |
850 FilteredFieldStream f(ikh, false, false); | |
851 | |
852 int max_field_index = f.field_count()-1; | |
853 | |
854 int index = 0; | |
855 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
856 // ignore static fields | |
857 if (fld.access_flags().is_static()) { | |
858 continue; | |
859 } | |
860 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
861 } | |
862 | |
863 return field_map; | |
864 } | |
865 | |
866 // Helper class used to cache a ClassFileMap for the instance fields of | |
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867 // a cache. A JvmtiCachedClassFieldMap can be cached by an InstanceKlass during |
0 | 868 // heap iteration and avoid creating a field map for each object in the heap |
869 // (only need to create the map when the first instance of a class is encountered). | |
870 // | |
6197 | 871 class JvmtiCachedClassFieldMap : public CHeapObj<mtInternal> { |
0 | 872 private: |
873 enum { | |
874 initial_class_count = 200 | |
875 }; | |
876 ClassFieldMap* _field_map; | |
877 | |
878 ClassFieldMap* field_map() const { return _field_map; } | |
879 | |
880 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
881 ~JvmtiCachedClassFieldMap(); | |
882 | |
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883 static GrowableArray<InstanceKlass*>* _class_list; |
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884 static void add_to_class_list(InstanceKlass* ik); |
0 | 885 |
886 public: | |
887 // returns the field map for a given object (returning map cached | |
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888 // by InstanceKlass if possible |
0 | 889 static ClassFieldMap* get_map_of_instance_fields(oop obj); |
890 | |
891 // removes the field map from all instanceKlasses - should be | |
892 // called before VM operation completes | |
893 static void clear_cache(); | |
894 | |
895 // returns the number of ClassFieldMap cached by instanceKlasses | |
896 static int cached_field_map_count(); | |
897 }; | |
898 | |
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899 GrowableArray<InstanceKlass*>* JvmtiCachedClassFieldMap::_class_list; |
0 | 900 |
901 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
902 _field_map = field_map; | |
903 } | |
904 | |
905 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
906 if (_field_map != NULL) { | |
907 delete _field_map; | |
908 } | |
909 } | |
910 | |
911 // Marker class to ensure that the class file map cache is only used in a defined | |
912 // scope. | |
913 class ClassFieldMapCacheMark : public StackObj { | |
914 private: | |
915 static bool _is_active; | |
916 public: | |
917 ClassFieldMapCacheMark() { | |
918 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
919 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
920 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
921 _is_active = true; | |
922 } | |
923 ~ClassFieldMapCacheMark() { | |
924 JvmtiCachedClassFieldMap::clear_cache(); | |
925 _is_active = false; | |
926 } | |
927 static bool is_active() { return _is_active; } | |
928 }; | |
929 | |
930 bool ClassFieldMapCacheMark::_is_active; | |
931 | |
932 | |
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933 // record that the given InstanceKlass is caching a field map |
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934 void JvmtiCachedClassFieldMap::add_to_class_list(InstanceKlass* ik) { |
0 | 935 if (_class_list == NULL) { |
6197 | 936 _class_list = new (ResourceObj::C_HEAP, mtInternal) |
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937 GrowableArray<InstanceKlass*>(initial_class_count, true); |
0 | 938 } |
939 _class_list->push(ik); | |
940 } | |
941 | |
942 // returns the instance field map for the given object | |
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943 // (returns field map cached by the InstanceKlass if possible) |
0 | 944 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { |
945 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
946 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
947 | |
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948 Klass* k = obj->klass(); |
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949 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 950 |
951 // return cached map if possible | |
952 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
953 if (cached_map != NULL) { | |
954 assert(cached_map->field_map() != NULL, "missing field list"); | |
955 return cached_map->field_map(); | |
956 } else { | |
957 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
958 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
959 ik->set_jvmti_cached_class_field_map(cached_map); | |
960 add_to_class_list(ik); | |
961 return field_map; | |
962 } | |
963 } | |
964 | |
965 // remove the fields maps cached from all instanceKlasses | |
966 void JvmtiCachedClassFieldMap::clear_cache() { | |
967 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
968 if (_class_list != NULL) { | |
969 for (int i = 0; i < _class_list->length(); i++) { | |
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970 InstanceKlass* ik = _class_list->at(i); |
0 | 971 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); |
972 assert(cached_map != NULL, "should not be NULL"); | |
973 ik->set_jvmti_cached_class_field_map(NULL); | |
974 delete cached_map; // deletes the encapsulated field map | |
975 } | |
976 delete _class_list; | |
977 _class_list = NULL; | |
978 } | |
979 } | |
980 | |
981 // returns the number of ClassFieldMap cached by instanceKlasses | |
982 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
983 return (_class_list == NULL) ? 0 : _class_list->length(); | |
984 } | |
985 | |
986 // helper function to indicate if an object is filtered by its tag or class tag | |
987 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
988 jlong klass_tag, | |
989 int heap_filter) { | |
990 // apply the heap filter | |
991 if (obj_tag != 0) { | |
992 // filter out tagged objects | |
993 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
994 } else { | |
995 // filter out untagged objects | |
996 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
997 } | |
998 if (klass_tag != 0) { | |
999 // filter out objects with tagged classes | |
1000 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
1001 } else { | |
1002 // filter out objects with untagged classes. | |
1003 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
1004 } | |
1005 return false; | |
1006 } | |
1007 | |
1008 // helper function to indicate if an object is filtered by a klass filter | |
1009 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
1010 if (!klass_filter.is_null()) { | |
1011 if (obj->klass() != klass_filter()) { | |
1012 return true; | |
1013 } | |
1014 } | |
1015 return false; | |
1016 } | |
1017 | |
1018 // helper function to tell if a field is a primitive field or not | |
1019 static inline bool is_primitive_field_type(char type) { | |
1020 return (type != 'L' && type != '['); | |
1021 } | |
1022 | |
1023 // helper function to copy the value from location addr to jvalue. | |
1024 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
1025 switch (value_type) { | |
1026 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
1027 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
1028 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
1029 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
1030 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
1031 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
1032 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
1033 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
1034 default: ShouldNotReachHere(); | |
1035 } | |
1036 } | |
1037 | |
1038 // helper function to invoke string primitive value callback | |
1039 // returns visit control flags | |
1040 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
1041 CallbackWrapper* wrapper, | |
1042 oop str, | |
1043 void* user_data) | |
1044 { | |
1142 | 1045 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 1046 |
1047 // get the string value and length | |
1048 // (string value may be offset from the base) | |
1049 int s_len = java_lang_String::length(str); | |
1050 typeArrayOop s_value = java_lang_String::value(str); | |
1051 int s_offset = java_lang_String::offset(str); | |
1052 jchar* value; | |
1053 if (s_len > 0) { | |
1054 value = s_value->char_at_addr(s_offset); | |
1055 } else { | |
1056 value = (jchar*) s_value->base(T_CHAR); | |
1057 } | |
1058 | |
1059 // invoke the callback | |
1060 return (*cb)(wrapper->klass_tag(), | |
1061 wrapper->obj_size(), | |
1062 wrapper->obj_tag_p(), | |
1063 value, | |
1064 (jint)s_len, | |
1065 user_data); | |
1066 } | |
1067 | |
1068 // helper function to invoke string primitive value callback | |
1069 // returns visit control flags | |
1070 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
1071 CallbackWrapper* wrapper, | |
1072 oop obj, | |
1073 void* user_data) | |
1074 { | |
1075 assert(obj->is_typeArray(), "not a primitive array"); | |
1076 | |
1077 // get base address of first element | |
1078 typeArrayOop array = typeArrayOop(obj); | |
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1079 BasicType type = TypeArrayKlass::cast(array->klass())->element_type(); |
0 | 1080 void* elements = array->base(type); |
1081 | |
1082 // jvmtiPrimitiveType is defined so this mapping is always correct | |
1083 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
1084 | |
1085 return (*cb)(wrapper->klass_tag(), | |
1086 wrapper->obj_size(), | |
1087 wrapper->obj_tag_p(), | |
1088 (jint)array->length(), | |
1089 elem_type, | |
1090 elements, | |
1091 user_data); | |
1092 } | |
1093 | |
1094 // helper function to invoke the primitive field callback for all static fields | |
1095 // of a given class | |
1096 static jint invoke_primitive_field_callback_for_static_fields | |
1097 (CallbackWrapper* wrapper, | |
1098 oop obj, | |
1099 jvmtiPrimitiveFieldCallback cb, | |
1100 void* user_data) | |
1101 { | |
1102 // for static fields only the index will be set | |
1103 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1104 | |
1142 | 1105 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
0 | 1106 if (java_lang_Class::is_primitive(obj)) { |
1107 return 0; | |
1108 } | |
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1109 Klass* klass = java_lang_Class::as_Klass(obj); |
0 | 1110 |
1111 // ignore classes for object and type arrays | |
1112 if (!klass->oop_is_instance()) { | |
1113 return 0; | |
1114 } | |
1115 | |
1116 // ignore classes which aren't linked yet | |
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1117 InstanceKlass* ik = InstanceKlass::cast(klass); |
0 | 1118 if (!ik->is_linked()) { |
1119 return 0; | |
1120 } | |
1121 | |
1122 // get the field map | |
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1123 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
0 | 1124 |
1125 // invoke the callback for each static primitive field | |
1126 for (int i=0; i<field_map->field_count(); i++) { | |
1127 ClassFieldDescriptor* field = field_map->field_at(i); | |
1128 | |
1129 // ignore non-primitive fields | |
1130 char type = field->field_type(); | |
1131 if (!is_primitive_field_type(type)) { | |
1132 continue; | |
1133 } | |
1134 // one-to-one mapping | |
1135 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1136 | |
1137 // get offset and field value | |
1138 int offset = field->field_offset(); | |
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1139 address addr = (address)klass->java_mirror() + offset; |
0 | 1140 jvalue value; |
1141 copy_to_jvalue(&value, addr, value_type); | |
1142 | |
1143 // field index | |
1144 reference_info.field.index = field->field_index(); | |
1145 | |
1146 // invoke the callback | |
1147 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
1148 &reference_info, | |
1149 wrapper->klass_tag(), | |
1150 wrapper->obj_tag_p(), | |
1151 value, | |
1152 value_type, | |
1153 user_data); | |
1154 if (res & JVMTI_VISIT_ABORT) { | |
1155 delete field_map; | |
1156 return res; | |
1157 } | |
1158 } | |
1159 | |
1160 delete field_map; | |
1161 return 0; | |
1162 } | |
1163 | |
1164 // helper function to invoke the primitive field callback for all instance fields | |
1165 // of a given object | |
1166 static jint invoke_primitive_field_callback_for_instance_fields( | |
1167 CallbackWrapper* wrapper, | |
1168 oop obj, | |
1169 jvmtiPrimitiveFieldCallback cb, | |
1170 void* user_data) | |
1171 { | |
1172 // for instance fields only the index will be set | |
1173 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1174 | |
1175 // get the map of the instance fields | |
1176 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
1177 | |
1178 // invoke the callback for each instance primitive field | |
1179 for (int i=0; i<fields->field_count(); i++) { | |
1180 ClassFieldDescriptor* field = fields->field_at(i); | |
1181 | |
1182 // ignore non-primitive fields | |
1183 char type = field->field_type(); | |
1184 if (!is_primitive_field_type(type)) { | |
1185 continue; | |
1186 } | |
1187 // one-to-one mapping | |
1188 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1189 | |
1190 // get offset and field value | |
1191 int offset = field->field_offset(); | |
1192 address addr = (address)obj + offset; | |
1193 jvalue value; | |
1194 copy_to_jvalue(&value, addr, value_type); | |
1195 | |
1196 // field index | |
1197 reference_info.field.index = field->field_index(); | |
1198 | |
1199 // invoke the callback | |
1200 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
1201 &reference_info, | |
1202 wrapper->klass_tag(), | |
1203 wrapper->obj_tag_p(), | |
1204 value, | |
1205 value_type, | |
1206 user_data); | |
1207 if (res & JVMTI_VISIT_ABORT) { | |
1208 return res; | |
1209 } | |
1210 } | |
1211 return 0; | |
1212 } | |
1213 | |
1214 | |
1215 // VM operation to iterate over all objects in the heap (both reachable | |
1216 // and unreachable) | |
1217 class VM_HeapIterateOperation: public VM_Operation { | |
1218 private: | |
1219 ObjectClosure* _blk; | |
1220 public: | |
1221 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
1222 | |
1223 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
1224 void doit() { | |
1225 // allows class files maps to be cached during iteration | |
1226 ClassFieldMapCacheMark cm; | |
1227 | |
1228 // make sure that heap is parsable (fills TLABs with filler objects) | |
1229 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1230 | |
1231 // Verify heap before iteration - if the heap gets corrupted then | |
1232 // JVMTI's IterateOverHeap will crash. | |
1233 if (VerifyBeforeIteration) { | |
1234 Universe::verify(); | |
1235 } | |
1236 | |
1237 // do the iteration | |
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1238 // If this operation encounters a bad object when using CMS, |
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1239 // consider using safe_object_iterate() which avoids perm gen |
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1240 // objects that may contain bad references. |
0 | 1241 Universe::heap()->object_iterate(_blk); |
1242 } | |
1243 | |
1244 }; | |
1245 | |
1246 | |
1247 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
1248 // IterateOverInstancesOfClass functions | |
1249 class IterateOverHeapObjectClosure: public ObjectClosure { | |
1250 private: | |
1251 JvmtiTagMap* _tag_map; | |
1252 KlassHandle _klass; | |
1253 jvmtiHeapObjectFilter _object_filter; | |
1254 jvmtiHeapObjectCallback _heap_object_callback; | |
1255 const void* _user_data; | |
1256 | |
1257 // accessors | |
1258 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1259 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
1260 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
1261 KlassHandle klass() const { return _klass; } | |
1262 const void* user_data() const { return _user_data; } | |
1263 | |
1264 // indicates if iteration has been aborted | |
1265 bool _iteration_aborted; | |
1266 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1267 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
1268 | |
1269 public: | |
1270 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
1271 KlassHandle klass, | |
1272 jvmtiHeapObjectFilter object_filter, | |
1273 jvmtiHeapObjectCallback heap_object_callback, | |
1274 const void* user_data) : | |
1275 _tag_map(tag_map), | |
1276 _klass(klass), | |
1277 _object_filter(object_filter), | |
1278 _heap_object_callback(heap_object_callback), | |
1279 _user_data(user_data), | |
1280 _iteration_aborted(false) | |
1281 { | |
1282 } | |
1283 | |
1284 void do_object(oop o); | |
1285 }; | |
1286 | |
1287 // invoked for each object in the heap | |
1288 void IterateOverHeapObjectClosure::do_object(oop o) { | |
1289 // check if iteration has been halted | |
1290 if (is_iteration_aborted()) return; | |
1291 | |
1292 // ignore any objects that aren't visible to profiler | |
1293 if (!ServiceUtil::visible_oop(o)) return; | |
1294 | |
1295 // instanceof check when filtering by klass | |
1296 if (!klass().is_null() && !o->is_a(klass()())) { | |
1297 return; | |
1298 } | |
1299 // prepare for the calllback | |
1300 CallbackWrapper wrapper(tag_map(), o); | |
1301 | |
1302 // if the object is tagged and we're only interested in untagged objects | |
1303 // then don't invoke the callback. Similiarly, if the object is untagged | |
1304 // and we're only interested in tagged objects we skip the callback. | |
1305 if (wrapper.obj_tag() != 0) { | |
1306 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
1307 } else { | |
1308 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
1309 } | |
1310 | |
1311 // invoke the agent's callback | |
1312 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
1313 wrapper.obj_size(), | |
1314 wrapper.obj_tag_p(), | |
1315 (void*)user_data()); | |
1316 if (control == JVMTI_ITERATION_ABORT) { | |
1317 set_iteration_aborted(true); | |
1318 } | |
1319 } | |
1320 | |
1321 // An ObjectClosure used to support the IterateThroughHeap function | |
1322 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
1323 private: | |
1324 JvmtiTagMap* _tag_map; | |
1325 KlassHandle _klass; | |
1326 int _heap_filter; | |
1327 const jvmtiHeapCallbacks* _callbacks; | |
1328 const void* _user_data; | |
1329 | |
1330 // accessor functions | |
1331 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1332 int heap_filter() const { return _heap_filter; } | |
1333 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
1334 KlassHandle klass() const { return _klass; } | |
1335 const void* user_data() const { return _user_data; } | |
1336 | |
1337 // indicates if the iteration has been aborted | |
1338 bool _iteration_aborted; | |
1339 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1340 | |
1341 // used to check the visit control flags. If the abort flag is set | |
1342 // then we set the iteration aborted flag so that the iteration completes | |
1343 // without processing any further objects | |
1344 bool check_flags_for_abort(jint flags) { | |
1345 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
1346 if (is_abort) { | |
1347 _iteration_aborted = true; | |
1348 } | |
1349 return is_abort; | |
1350 } | |
1351 | |
1352 public: | |
1353 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
1354 KlassHandle klass, | |
1355 int heap_filter, | |
1356 const jvmtiHeapCallbacks* heap_callbacks, | |
1357 const void* user_data) : | |
1358 _tag_map(tag_map), | |
1359 _klass(klass), | |
1360 _heap_filter(heap_filter), | |
1361 _callbacks(heap_callbacks), | |
1362 _user_data(user_data), | |
1363 _iteration_aborted(false) | |
1364 { | |
1365 } | |
1366 | |
1367 void do_object(oop o); | |
1368 }; | |
1369 | |
1370 // invoked for each object in the heap | |
1371 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
1372 // check if iteration has been halted | |
1373 if (is_iteration_aborted()) return; | |
1374 | |
1375 // ignore any objects that aren't visible to profiler | |
1376 if (!ServiceUtil::visible_oop(obj)) return; | |
1377 | |
1378 // apply class filter | |
1379 if (is_filtered_by_klass_filter(obj, klass())) return; | |
1380 | |
1381 // prepare for callback | |
1382 CallbackWrapper wrapper(tag_map(), obj); | |
1383 | |
1384 // check if filtered by the heap filter | |
1385 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
1386 return; | |
1387 } | |
1388 | |
1389 // for arrays we need the length, otherwise -1 | |
1390 bool is_array = obj->is_array(); | |
1391 int len = is_array ? arrayOop(obj)->length() : -1; | |
1392 | |
1393 // invoke the object callback (if callback is provided) | |
1394 if (callbacks()->heap_iteration_callback != NULL) { | |
1395 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
1396 jint res = (*cb)(wrapper.klass_tag(), | |
1397 wrapper.obj_size(), | |
1398 wrapper.obj_tag_p(), | |
1399 (jint)len, | |
1400 (void*)user_data()); | |
1401 if (check_flags_for_abort(res)) return; | |
1402 } | |
1403 | |
1404 // for objects and classes we report primitive fields if callback provided | |
1405 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
1406 jint res; | |
1407 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
1142 | 1408 if (obj->klass() == SystemDictionary::Class_klass()) { |
0 | 1409 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
1410 obj, | |
1411 cb, | |
1412 (void*)user_data()); | |
1413 } else { | |
1414 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
1415 obj, | |
1416 cb, | |
1417 (void*)user_data()); | |
1418 } | |
1419 if (check_flags_for_abort(res)) return; | |
1420 } | |
1421 | |
1422 // string callback | |
1423 if (!is_array && | |
1424 callbacks()->string_primitive_value_callback != NULL && | |
1142 | 1425 obj->klass() == SystemDictionary::String_klass()) { |
0 | 1426 jint res = invoke_string_value_callback( |
1427 callbacks()->string_primitive_value_callback, | |
1428 &wrapper, | |
1429 obj, | |
1430 (void*)user_data() ); | |
1431 if (check_flags_for_abort(res)) return; | |
1432 } | |
1433 | |
1434 // array callback | |
1435 if (is_array && | |
1436 callbacks()->array_primitive_value_callback != NULL && | |
1437 obj->is_typeArray()) { | |
1438 jint res = invoke_array_primitive_value_callback( | |
1439 callbacks()->array_primitive_value_callback, | |
1440 &wrapper, | |
1441 obj, | |
1442 (void*)user_data() ); | |
1443 if (check_flags_for_abort(res)) return; | |
1444 } | |
1445 }; | |
1446 | |
1447 | |
1448 // Deprecated function to iterate over all objects in the heap | |
1449 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
1450 KlassHandle klass, | |
1451 jvmtiHeapObjectCallback heap_object_callback, | |
1452 const void* user_data) | |
1453 { | |
1454 MutexLocker ml(Heap_lock); | |
1455 IterateOverHeapObjectClosure blk(this, | |
1456 klass, | |
1457 object_filter, | |
1458 heap_object_callback, | |
1459 user_data); | |
1460 VM_HeapIterateOperation op(&blk); | |
1461 VMThread::execute(&op); | |
1462 } | |
1463 | |
1464 | |
1465 // Iterates over all objects in the heap | |
1466 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
1467 KlassHandle klass, | |
1468 const jvmtiHeapCallbacks* callbacks, | |
1469 const void* user_data) | |
1470 { | |
1471 MutexLocker ml(Heap_lock); | |
1472 IterateThroughHeapObjectClosure blk(this, | |
1473 klass, | |
1474 heap_filter, | |
1475 callbacks, | |
1476 user_data); | |
1477 VM_HeapIterateOperation op(&blk); | |
1478 VMThread::execute(&op); | |
1479 } | |
1480 | |
1481 // support class for get_objects_with_tags | |
1482 | |
1483 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
1484 private: | |
1485 JvmtiEnv* _env; | |
1486 jlong* _tags; | |
1487 jint _tag_count; | |
1488 | |
1489 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
1490 GrowableArray<uint64_t>* _tag_results; // collected tags | |
1491 | |
1492 public: | |
1493 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
1494 _env = env; | |
1495 _tags = (jlong*)tags; | |
1496 _tag_count = tag_count; | |
6197 | 1497 _object_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jobject>(1,true); |
1498 _tag_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<uint64_t>(1,true); | |
0 | 1499 } |
1500 | |
1501 ~TagObjectCollector() { | |
1502 delete _object_results; | |
1503 delete _tag_results; | |
1504 } | |
1505 | |
1506 // for each tagged object check if the tag value matches | |
1507 // - if it matches then we create a JNI local reference to the object | |
1508 // and record the reference and tag value. | |
1509 // | |
1510 void do_entry(JvmtiTagHashmapEntry* entry) { | |
1511 for (int i=0; i<_tag_count; i++) { | |
1512 if (_tags[i] == entry->tag()) { | |
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1513 oop o = entry->object(); |
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1514 assert(o != NULL && Universe::heap()->is_in_reserved(o), "sanity check"); |
0 | 1515 jobject ref = JNIHandles::make_local(JavaThread::current(), o); |
1516 _object_results->append(ref); | |
1517 _tag_results->append((uint64_t)entry->tag()); | |
1518 } | |
1519 } | |
1520 } | |
1521 | |
1522 // return the results from the collection | |
1523 // | |
1524 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1525 jvmtiError error; | |
1526 int count = _object_results->length(); | |
1527 assert(count >= 0, "sanity check"); | |
1528 | |
1529 // if object_result_ptr is not NULL then allocate the result and copy | |
1530 // in the object references. | |
1531 if (object_result_ptr != NULL) { | |
1532 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
1533 if (error != JVMTI_ERROR_NONE) { | |
1534 return error; | |
1535 } | |
1536 for (int i=0; i<count; i++) { | |
1537 (*object_result_ptr)[i] = _object_results->at(i); | |
1538 } | |
1539 } | |
1540 | |
1541 // if tag_result_ptr is not NULL then allocate the result and copy | |
1542 // in the tag values. | |
1543 if (tag_result_ptr != NULL) { | |
1544 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
1545 if (error != JVMTI_ERROR_NONE) { | |
1546 if (object_result_ptr != NULL) { | |
1547 _env->Deallocate((unsigned char*)object_result_ptr); | |
1548 } | |
1549 return error; | |
1550 } | |
1551 for (int i=0; i<count; i++) { | |
1552 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
1553 } | |
1554 } | |
1555 | |
1556 *count_ptr = count; | |
1557 return JVMTI_ERROR_NONE; | |
1558 } | |
1559 }; | |
1560 | |
1561 // return the list of objects with the specified tags | |
1562 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
1563 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1564 | |
1565 TagObjectCollector collector(env(), tags, count); | |
1566 { | |
1567 // iterate over all tagged objects | |
1568 MutexLocker ml(lock()); | |
1569 entry_iterate(&collector); | |
1570 } | |
1571 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
1572 } | |
1573 | |
1574 | |
1575 // ObjectMarker is used to support the marking objects when walking the | |
1576 // heap. | |
1577 // | |
1578 // This implementation uses the existing mark bits in an object for | |
1579 // marking. Objects that are marked must later have their headers restored. | |
1580 // As most objects are unlocked and don't have their identity hash computed | |
1581 // we don't have to save their headers. Instead we save the headers that | |
1582 // are "interesting". Later when the headers are restored this implementation | |
1583 // restores all headers to their initial value and then restores the few | |
1584 // objects that had interesting headers. | |
1585 // | |
1586 // Future work: This implementation currently uses growable arrays to save | |
1587 // the oop and header of interesting objects. As an optimization we could | |
1588 // use the same technique as the GC and make use of the unused area | |
1589 // between top() and end(). | |
1590 // | |
1591 | |
1592 // An ObjectClosure used to restore the mark bits of an object | |
1593 class RestoreMarksClosure : public ObjectClosure { | |
1594 public: | |
1595 void do_object(oop o) { | |
1596 if (o != NULL) { | |
1597 markOop mark = o->mark(); | |
1598 if (mark->is_marked()) { | |
1599 o->init_mark(); | |
1600 } | |
1601 } | |
1602 } | |
1603 }; | |
1604 | |
1605 // ObjectMarker provides the mark and visited functions | |
1606 class ObjectMarker : AllStatic { | |
1607 private: | |
1608 // saved headers | |
1609 static GrowableArray<oop>* _saved_oop_stack; | |
1610 static GrowableArray<markOop>* _saved_mark_stack; | |
3815 | 1611 static bool _needs_reset; // do we need to reset mark bits? |
0 | 1612 |
1613 public: | |
1614 static void init(); // initialize | |
1615 static void done(); // clean-up | |
1616 | |
1617 static inline void mark(oop o); // mark an object | |
1618 static inline bool visited(oop o); // check if object has been visited | |
3815 | 1619 |
1620 static inline bool needs_reset() { return _needs_reset; } | |
1621 static inline void set_needs_reset(bool v) { _needs_reset = v; } | |
0 | 1622 }; |
1623 | |
1624 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
1625 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
3815 | 1626 bool ObjectMarker::_needs_reset = true; // need to reset mark bits by default |
0 | 1627 |
1628 // initialize ObjectMarker - prepares for object marking | |
1629 void ObjectMarker::init() { | |
1630 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
1631 | |
1632 // prepare heap for iteration | |
1633 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1634 | |
1635 // create stacks for interesting headers | |
6197 | 1636 _saved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markOop>(4000, true); |
1637 _saved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(4000, true); | |
0 | 1638 |
1639 if (UseBiasedLocking) { | |
1640 BiasedLocking::preserve_marks(); | |
1641 } | |
1642 } | |
1643 | |
1644 // Object marking is done so restore object headers | |
1645 void ObjectMarker::done() { | |
1646 // iterate over all objects and restore the mark bits to | |
1647 // their initial value | |
1648 RestoreMarksClosure blk; | |
3815 | 1649 if (needs_reset()) { |
1650 Universe::heap()->object_iterate(&blk); | |
1651 } else { | |
1652 // We don't need to reset mark bits on this call, but reset the | |
1653 // flag to the default for the next call. | |
1654 set_needs_reset(true); | |
1655 } | |
0 | 1656 |
1657 // now restore the interesting headers | |
1658 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
1659 oop o = _saved_oop_stack->at(i); | |
1660 markOop mark = _saved_mark_stack->at(i); | |
1661 o->set_mark(mark); | |
1662 } | |
1663 | |
1664 if (UseBiasedLocking) { | |
1665 BiasedLocking::restore_marks(); | |
1666 } | |
1667 | |
1668 // free the stacks | |
1669 delete _saved_oop_stack; | |
1670 delete _saved_mark_stack; | |
1671 } | |
1672 | |
1673 // mark an object | |
1674 inline void ObjectMarker::mark(oop o) { | |
1675 assert(Universe::heap()->is_in(o), "sanity check"); | |
1676 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
1677 | |
1678 // object's mark word | |
1679 markOop mark = o->mark(); | |
1680 | |
1681 if (mark->must_be_preserved(o)) { | |
1682 _saved_mark_stack->push(mark); | |
1683 _saved_oop_stack->push(o); | |
1684 } | |
1685 | |
1686 // mark the object | |
1687 o->set_mark(markOopDesc::prototype()->set_marked()); | |
1688 } | |
1689 | |
1690 // return true if object is marked | |
1691 inline bool ObjectMarker::visited(oop o) { | |
1692 return o->mark()->is_marked(); | |
1693 } | |
1694 | |
1695 // Stack allocated class to help ensure that ObjectMarker is used | |
1696 // correctly. Constructor initializes ObjectMarker, destructor calls | |
1697 // ObjectMarker's done() function to restore object headers. | |
1698 class ObjectMarkerController : public StackObj { | |
1699 public: | |
1700 ObjectMarkerController() { | |
1701 ObjectMarker::init(); | |
1702 } | |
1703 ~ObjectMarkerController() { | |
1704 ObjectMarker::done(); | |
1705 } | |
1706 }; | |
1707 | |
1708 | |
1709 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
1710 // (not performance critical as only used for roots) | |
1711 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
1712 switch (kind) { | |
1713 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
1714 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
1715 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
1716 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
1717 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
1718 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
1719 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
1720 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
1721 } | |
1722 } | |
1723 | |
1724 // Base class for all heap walk contexts. The base class maintains a flag | |
1725 // to indicate if the context is valid or not. | |
1726 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
1727 private: | |
1728 bool _valid; | |
1729 public: | |
1730 HeapWalkContext(bool valid) { _valid = valid; } | |
1731 void invalidate() { _valid = false; } | |
1732 bool is_valid() const { return _valid; } | |
1733 }; | |
1734 | |
1735 // A basic heap walk context for the deprecated heap walking functions. | |
1736 // The context for a basic heap walk are the callbacks and fields used by | |
1737 // the referrer caching scheme. | |
1738 class BasicHeapWalkContext: public HeapWalkContext { | |
1739 private: | |
1740 jvmtiHeapRootCallback _heap_root_callback; | |
1741 jvmtiStackReferenceCallback _stack_ref_callback; | |
1742 jvmtiObjectReferenceCallback _object_ref_callback; | |
1743 | |
1744 // used for caching | |
1745 oop _last_referrer; | |
1746 jlong _last_referrer_tag; | |
1747 | |
1748 public: | |
1749 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
1750 | |
1751 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
1752 jvmtiStackReferenceCallback stack_ref_callback, | |
1753 jvmtiObjectReferenceCallback object_ref_callback) : | |
1754 HeapWalkContext(true), | |
1755 _heap_root_callback(heap_root_callback), | |
1756 _stack_ref_callback(stack_ref_callback), | |
1757 _object_ref_callback(object_ref_callback), | |
1758 _last_referrer(NULL), | |
1759 _last_referrer_tag(0) { | |
1760 } | |
1761 | |
1762 // accessors | |
1763 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
1764 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
1765 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
1766 | |
1767 oop last_referrer() const { return _last_referrer; } | |
1768 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
1769 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
1770 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
1771 }; | |
1772 | |
1773 // The advanced heap walk context for the FollowReferences functions. | |
1774 // The context is the callbacks, and the fields used for filtering. | |
1775 class AdvancedHeapWalkContext: public HeapWalkContext { | |
1776 private: | |
1777 jint _heap_filter; | |
1778 KlassHandle _klass_filter; | |
1779 const jvmtiHeapCallbacks* _heap_callbacks; | |
1780 | |
1781 public: | |
1782 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
1783 | |
1784 AdvancedHeapWalkContext(jint heap_filter, | |
1785 KlassHandle klass_filter, | |
1786 const jvmtiHeapCallbacks* heap_callbacks) : | |
1787 HeapWalkContext(true), | |
1788 _heap_filter(heap_filter), | |
1789 _klass_filter(klass_filter), | |
1790 _heap_callbacks(heap_callbacks) { | |
1791 } | |
1792 | |
1793 // accessors | |
1794 jint heap_filter() const { return _heap_filter; } | |
1795 KlassHandle klass_filter() const { return _klass_filter; } | |
1796 | |
1797 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
1798 return _heap_callbacks->heap_reference_callback; | |
1799 }; | |
1800 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
1801 return _heap_callbacks->primitive_field_callback; | |
1802 } | |
1803 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
1804 return _heap_callbacks->array_primitive_value_callback; | |
1805 } | |
1806 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
1807 return _heap_callbacks->string_primitive_value_callback; | |
1808 } | |
1809 }; | |
1810 | |
1811 // The CallbackInvoker is a class with static functions that the heap walk can call | |
1812 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
1813 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
1814 // mode is for the newer FollowReferences function which supports a lot of | |
1815 // additional callbacks. | |
1816 class CallbackInvoker : AllStatic { | |
1817 private: | |
1818 // heap walk styles | |
1819 enum { basic, advanced }; | |
1820 static int _heap_walk_type; | |
1821 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
1822 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
1823 | |
1824 // context for basic style heap walk | |
1825 static BasicHeapWalkContext _basic_context; | |
1826 static BasicHeapWalkContext* basic_context() { | |
1827 assert(_basic_context.is_valid(), "invalid"); | |
1828 return &_basic_context; | |
1829 } | |
1830 | |
1831 // context for advanced style heap walk | |
1832 static AdvancedHeapWalkContext _advanced_context; | |
1833 static AdvancedHeapWalkContext* advanced_context() { | |
1834 assert(_advanced_context.is_valid(), "invalid"); | |
1835 return &_advanced_context; | |
1836 } | |
1837 | |
1838 // context needed for all heap walks | |
1839 static JvmtiTagMap* _tag_map; | |
1840 static const void* _user_data; | |
1841 static GrowableArray<oop>* _visit_stack; | |
1842 | |
1843 // accessors | |
1844 static JvmtiTagMap* tag_map() { return _tag_map; } | |
1845 static const void* user_data() { return _user_data; } | |
1846 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
1847 | |
1848 // if the object hasn't been visited then push it onto the visit stack | |
1849 // so that it will be visited later | |
1850 static inline bool check_for_visit(oop obj) { | |
1851 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
1852 return true; | |
1853 } | |
1854 | |
1855 // invoke basic style callbacks | |
1856 static inline bool invoke_basic_heap_root_callback | |
1857 (jvmtiHeapRootKind root_kind, oop obj); | |
1858 static inline bool invoke_basic_stack_ref_callback | |
1859 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
1860 int slot, oop obj); | |
1861 static inline bool invoke_basic_object_reference_callback | |
1862 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1863 | |
1864 // invoke advanced style callbacks | |
1865 static inline bool invoke_advanced_heap_root_callback | |
1866 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
1867 static inline bool invoke_advanced_stack_ref_callback | |
1868 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
1869 jmethodID method, jlocation bci, jint slot, oop obj); | |
1870 static inline bool invoke_advanced_object_reference_callback | |
1871 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1872 | |
1873 // used to report the value of primitive fields | |
1874 static inline bool report_primitive_field | |
1875 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
1876 | |
1877 public: | |
1878 // initialize for basic mode | |
1879 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1880 GrowableArray<oop>* visit_stack, | |
1881 const void* user_data, | |
1882 BasicHeapWalkContext context); | |
1883 | |
1884 // initialize for advanced mode | |
1885 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1886 GrowableArray<oop>* visit_stack, | |
1887 const void* user_data, | |
1888 AdvancedHeapWalkContext context); | |
1889 | |
1890 // functions to report roots | |
1891 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
1892 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
1893 jmethodID m, oop o); | |
1894 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
1895 jmethodID method, jlocation bci, jint slot, oop o); | |
1896 | |
1897 // functions to report references | |
1898 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
1899 static inline bool report_class_reference(oop referrer, oop referree); | |
1900 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
1901 static inline bool report_signers_reference(oop referrer, oop referree); | |
1902 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
1903 static inline bool report_superclass_reference(oop referrer, oop referree); | |
1904 static inline bool report_interface_reference(oop referrer, oop referree); | |
1905 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
1906 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
1907 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
1908 static inline bool report_primitive_array_values(oop array); | |
1909 static inline bool report_string_value(oop str); | |
1910 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
1911 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
1912 }; | |
1913 | |
1914 // statics | |
1915 int CallbackInvoker::_heap_walk_type; | |
1916 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
1917 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
1918 JvmtiTagMap* CallbackInvoker::_tag_map; | |
1919 const void* CallbackInvoker::_user_data; | |
1920 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
1921 | |
1922 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
1923 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1924 GrowableArray<oop>* visit_stack, | |
1925 const void* user_data, | |
1926 BasicHeapWalkContext context) { | |
1927 _tag_map = tag_map; | |
1928 _visit_stack = visit_stack; | |
1929 _user_data = user_data; | |
1930 _basic_context = context; | |
1931 _advanced_context.invalidate(); // will trigger assertion if used | |
1932 _heap_walk_type = basic; | |
1933 } | |
1934 | |
1935 // initialize for advanced heap walk (FollowReferences) | |
1936 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1937 GrowableArray<oop>* visit_stack, | |
1938 const void* user_data, | |
1939 AdvancedHeapWalkContext context) { | |
1940 _tag_map = tag_map; | |
1941 _visit_stack = visit_stack; | |
1942 _user_data = user_data; | |
1943 _advanced_context = context; | |
1944 _basic_context.invalidate(); // will trigger assertion if used | |
1945 _heap_walk_type = advanced; | |
1946 } | |
1947 | |
1948 | |
1949 // invoke basic style heap root callback | |
1950 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
1951 assert(ServiceUtil::visible_oop(obj), "checking"); | |
1952 | |
1953 // if we heap roots should be reported | |
1954 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
1955 if (cb == NULL) { | |
1956 return check_for_visit(obj); | |
1957 } | |
1958 | |
1959 CallbackWrapper wrapper(tag_map(), obj); | |
1960 jvmtiIterationControl control = (*cb)(root_kind, | |
1961 wrapper.klass_tag(), | |
1962 wrapper.obj_size(), | |
1963 wrapper.obj_tag_p(), | |
1964 (void*)user_data()); | |
1965 // push root to visit stack when following references | |
1966 if (control == JVMTI_ITERATION_CONTINUE && | |
1967 basic_context()->object_ref_callback() != NULL) { | |
1968 visit_stack()->push(obj); | |
1969 } | |
1970 return control != JVMTI_ITERATION_ABORT; | |
1971 } | |
1972 | |
1973 // invoke basic style stack ref callback | |
1974 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
1975 jlong thread_tag, | |
1976 jint depth, | |
1977 jmethodID method, | |
1978 jint slot, | |
1979 oop obj) { | |
1980 assert(ServiceUtil::visible_oop(obj), "checking"); | |
1981 | |
1982 // if we stack refs should be reported | |
1983 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
1984 if (cb == NULL) { | |
1985 return check_for_visit(obj); | |
1986 } | |
1987 | |
1988 CallbackWrapper wrapper(tag_map(), obj); | |
1989 jvmtiIterationControl control = (*cb)(root_kind, | |
1990 wrapper.klass_tag(), | |
1991 wrapper.obj_size(), | |
1992 wrapper.obj_tag_p(), | |
1993 thread_tag, | |
1994 depth, | |
1995 method, | |
1996 slot, | |
1997 (void*)user_data()); | |
1998 // push root to visit stack when following references | |
1999 if (control == JVMTI_ITERATION_CONTINUE && | |
2000 basic_context()->object_ref_callback() != NULL) { | |
2001 visit_stack()->push(obj); | |
2002 } | |
2003 return control != JVMTI_ITERATION_ABORT; | |
2004 } | |
2005 | |
2006 // invoke basic style object reference callback | |
2007 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
2008 oop referrer, | |
2009 oop referree, | |
2010 jint index) { | |
2011 | |
2012 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2013 assert(ServiceUtil::visible_oop(referree), "checking"); | |
2014 | |
2015 BasicHeapWalkContext* context = basic_context(); | |
2016 | |
2017 // callback requires the referrer's tag. If it's the same referrer | |
2018 // as the last call then we use the cached value. | |
2019 jlong referrer_tag; | |
2020 if (referrer == context->last_referrer()) { | |
2021 referrer_tag = context->last_referrer_tag(); | |
2022 } else { | |
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2023 referrer_tag = tag_for(tag_map(), referrer); |
0 | 2024 } |
2025 | |
2026 // do the callback | |
2027 CallbackWrapper wrapper(tag_map(), referree); | |
2028 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
2029 jvmtiIterationControl control = (*cb)(ref_kind, | |
2030 wrapper.klass_tag(), | |
2031 wrapper.obj_size(), | |
2032 wrapper.obj_tag_p(), | |
2033 referrer_tag, | |
2034 index, | |
2035 (void*)user_data()); | |
2036 | |
2037 // record referrer and referrer tag. For self-references record the | |
2038 // tag value from the callback as this might differ from referrer_tag. | |
2039 context->set_last_referrer(referrer); | |
2040 if (referrer == referree) { | |
2041 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
2042 } else { | |
2043 context->set_last_referrer_tag(referrer_tag); | |
2044 } | |
2045 | |
2046 if (control == JVMTI_ITERATION_CONTINUE) { | |
2047 return check_for_visit(referree); | |
2048 } else { | |
2049 return control != JVMTI_ITERATION_ABORT; | |
2050 } | |
2051 } | |
2052 | |
2053 // invoke advanced style heap root callback | |
2054 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
2055 oop obj) { | |
2056 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2057 | |
2058 AdvancedHeapWalkContext* context = advanced_context(); | |
2059 | |
2060 // check that callback is provided | |
2061 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2062 if (cb == NULL) { | |
2063 return check_for_visit(obj); | |
2064 } | |
2065 | |
2066 // apply class filter | |
2067 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2068 return check_for_visit(obj); | |
2069 } | |
2070 | |
2071 // setup the callback wrapper | |
2072 CallbackWrapper wrapper(tag_map(), obj); | |
2073 | |
2074 // apply tag filter | |
2075 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2076 wrapper.klass_tag(), | |
2077 context->heap_filter())) { | |
2078 return check_for_visit(obj); | |
2079 } | |
2080 | |
2081 // for arrays we need the length, otherwise -1 | |
2082 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2083 | |
2084 // invoke the callback | |
2085 jint res = (*cb)(ref_kind, | |
2086 NULL, // referrer info | |
2087 wrapper.klass_tag(), | |
2088 0, // referrer_class_tag is 0 for heap root | |
2089 wrapper.obj_size(), | |
2090 wrapper.obj_tag_p(), | |
2091 NULL, // referrer_tag_p | |
2092 len, | |
2093 (void*)user_data()); | |
2094 if (res & JVMTI_VISIT_ABORT) { | |
2095 return false;// referrer class tag | |
2096 } | |
2097 if (res & JVMTI_VISIT_OBJECTS) { | |
2098 check_for_visit(obj); | |
2099 } | |
2100 return true; | |
2101 } | |
2102 | |
2103 // report a reference from a thread stack to an object | |
2104 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
2105 jlong thread_tag, | |
2106 jlong tid, | |
2107 int depth, | |
2108 jmethodID method, | |
2109 jlocation bci, | |
2110 jint slot, | |
2111 oop obj) { | |
2112 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2113 | |
2114 AdvancedHeapWalkContext* context = advanced_context(); | |
2115 | |
2116 // check that callback is provider | |
2117 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2118 if (cb == NULL) { | |
2119 return check_for_visit(obj); | |
2120 } | |
2121 | |
2122 // apply class filter | |
2123 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2124 return check_for_visit(obj); | |
2125 } | |
2126 | |
2127 // setup the callback wrapper | |
2128 CallbackWrapper wrapper(tag_map(), obj); | |
2129 | |
2130 // apply tag filter | |
2131 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2132 wrapper.klass_tag(), | |
2133 context->heap_filter())) { | |
2134 return check_for_visit(obj); | |
2135 } | |
2136 | |
2137 // setup the referrer info | |
2138 jvmtiHeapReferenceInfo reference_info; | |
2139 reference_info.stack_local.thread_tag = thread_tag; | |
2140 reference_info.stack_local.thread_id = tid; | |
2141 reference_info.stack_local.depth = depth; | |
2142 reference_info.stack_local.method = method; | |
2143 reference_info.stack_local.location = bci; | |
2144 reference_info.stack_local.slot = slot; | |
2145 | |
2146 // for arrays we need the length, otherwise -1 | |
2147 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2148 | |
2149 // call into the agent | |
2150 int res = (*cb)(ref_kind, | |
2151 &reference_info, | |
2152 wrapper.klass_tag(), | |
2153 0, // referrer_class_tag is 0 for heap root (stack) | |
2154 wrapper.obj_size(), | |
2155 wrapper.obj_tag_p(), | |
2156 NULL, // referrer_tag is 0 for root | |
2157 len, | |
2158 (void*)user_data()); | |
2159 | |
2160 if (res & JVMTI_VISIT_ABORT) { | |
2161 return false; | |
2162 } | |
2163 if (res & JVMTI_VISIT_OBJECTS) { | |
2164 check_for_visit(obj); | |
2165 } | |
2166 return true; | |
2167 } | |
2168 | |
2169 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
2170 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
2171 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
2172 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
2173 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
2174 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
2175 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
2176 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
2177 | |
2178 // invoke the object reference callback to report a reference | |
2179 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
2180 oop referrer, | |
2181 oop obj, | |
2182 jint index) | |
2183 { | |
2184 // field index is only valid field in reference_info | |
2185 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2186 | |
2187 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2188 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2189 | |
2190 AdvancedHeapWalkContext* context = advanced_context(); | |
2191 | |
2192 // check that callback is provider | |
2193 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2194 if (cb == NULL) { | |
2195 return check_for_visit(obj); | |
2196 } | |
2197 | |
2198 // apply class filter | |
2199 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2200 return check_for_visit(obj); | |
2201 } | |
2202 | |
2203 // setup the callback wrapper | |
2204 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
2205 | |
2206 // apply tag filter | |
2207 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2208 wrapper.klass_tag(), | |
2209 context->heap_filter())) { | |
2210 return check_for_visit(obj); | |
2211 } | |
2212 | |
2213 // field index is only valid field in reference_info | |
2214 reference_info.field.index = index; | |
2215 | |
2216 // for arrays we need the length, otherwise -1 | |
2217 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2218 | |
2219 // invoke the callback | |
2220 int res = (*cb)(ref_kind, | |
2221 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
2222 wrapper.klass_tag(), | |
2223 wrapper.referrer_klass_tag(), | |
2224 wrapper.obj_size(), | |
2225 wrapper.obj_tag_p(), | |
2226 wrapper.referrer_tag_p(), | |
2227 len, | |
2228 (void*)user_data()); | |
2229 | |
2230 if (res & JVMTI_VISIT_ABORT) { | |
2231 return false; | |
2232 } | |
2233 if (res & JVMTI_VISIT_OBJECTS) { | |
2234 check_for_visit(obj); | |
2235 } | |
2236 return true; | |
2237 } | |
2238 | |
2239 // report a "simple root" | |
2240 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
2241 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
2242 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
2243 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2244 | |
2245 if (is_basic_heap_walk()) { | |
2246 // map to old style root kind | |
2247 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
2248 return invoke_basic_heap_root_callback(root_kind, obj); | |
2249 } else { | |
2250 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
2251 return invoke_advanced_heap_root_callback(kind, obj); | |
2252 } | |
2253 } | |
2254 | |
2255 | |
2256 // invoke the primitive array values | |
2257 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
2258 assert(obj->is_typeArray(), "not a primitive array"); | |
2259 | |
2260 AdvancedHeapWalkContext* context = advanced_context(); | |
2261 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
2262 | |
2263 // apply class filter | |
2264 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2265 return true; | |
2266 } | |
2267 | |
2268 CallbackWrapper wrapper(tag_map(), obj); | |
2269 | |
2270 // apply tag filter | |
2271 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2272 wrapper.klass_tag(), | |
2273 context->heap_filter())) { | |
2274 return true; | |
2275 } | |
2276 | |
2277 // invoke the callback | |
2278 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
2279 &wrapper, | |
2280 obj, | |
2281 (void*)user_data()); | |
2282 return (!(res & JVMTI_VISIT_ABORT)); | |
2283 } | |
2284 | |
2285 // invoke the string value callback | |
2286 inline bool CallbackInvoker::report_string_value(oop str) { | |
1142 | 2287 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 2288 |
2289 AdvancedHeapWalkContext* context = advanced_context(); | |
2290 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
2291 | |
2292 // apply class filter | |
2293 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
2294 return true; | |
2295 } | |
2296 | |
2297 CallbackWrapper wrapper(tag_map(), str); | |
2298 | |
2299 // apply tag filter | |
2300 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2301 wrapper.klass_tag(), | |
2302 context->heap_filter())) { | |
2303 return true; | |
2304 } | |
2305 | |
2306 // invoke the callback | |
2307 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
2308 &wrapper, | |
2309 str, | |
2310 (void*)user_data()); | |
2311 return (!(res & JVMTI_VISIT_ABORT)); | |
2312 } | |
2313 | |
2314 // invoke the primitive field callback | |
2315 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
2316 oop obj, | |
2317 jint index, | |
2318 address addr, | |
2319 char type) | |
2320 { | |
2321 // for primitive fields only the index will be set | |
2322 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2323 | |
2324 AdvancedHeapWalkContext* context = advanced_context(); | |
2325 assert(context->primitive_field_callback() != NULL, "no callback"); | |
2326 | |
2327 // apply class filter | |
2328 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2329 return true; | |
2330 } | |
2331 | |
2332 CallbackWrapper wrapper(tag_map(), obj); | |
2333 | |
2334 // apply tag filter | |
2335 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2336 wrapper.klass_tag(), | |
2337 context->heap_filter())) { | |
2338 return true; | |
2339 } | |
2340 | |
2341 // the field index in the referrer | |
2342 reference_info.field.index = index; | |
2343 | |
2344 // map the type | |
2345 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
2346 | |
2347 // setup the jvalue | |
2348 jvalue value; | |
2349 copy_to_jvalue(&value, addr, value_type); | |
2350 | |
2351 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
2352 int res = (*cb)(ref_kind, | |
2353 &reference_info, | |
2354 wrapper.klass_tag(), | |
2355 wrapper.obj_tag_p(), | |
2356 value, | |
2357 value_type, | |
2358 (void*)user_data()); | |
2359 return (!(res & JVMTI_VISIT_ABORT)); | |
2360 } | |
2361 | |
2362 | |
2363 // instance field | |
2364 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
2365 jint index, | |
2366 address value, | |
2367 char type) { | |
2368 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
2369 obj, | |
2370 index, | |
2371 value, | |
2372 type); | |
2373 } | |
2374 | |
2375 // static field | |
2376 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
2377 jint index, | |
2378 address value, | |
2379 char type) { | |
2380 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
2381 obj, | |
2382 index, | |
2383 value, | |
2384 type); | |
2385 } | |
2386 | |
2387 // report a JNI local (root object) to the profiler | |
2388 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
2389 if (is_basic_heap_walk()) { | |
2390 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
2391 thread_tag, | |
2392 depth, | |
2393 m, | |
2394 -1, | |
2395 obj); | |
2396 } else { | |
2397 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
2398 thread_tag, tid, | |
2399 depth, | |
2400 m, | |
2401 (jlocation)-1, | |
2402 -1, | |
2403 obj); | |
2404 } | |
2405 } | |
2406 | |
2407 | |
2408 // report a local (stack reference, root object) | |
2409 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
2410 jlong tid, | |
2411 jint depth, | |
2412 jmethodID method, | |
2413 jlocation bci, | |
2414 jint slot, | |
2415 oop obj) { | |
2416 if (is_basic_heap_walk()) { | |
2417 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
2418 thread_tag, | |
2419 depth, | |
2420 method, | |
2421 slot, | |
2422 obj); | |
2423 } else { | |
2424 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
2425 thread_tag, | |
2426 tid, | |
2427 depth, | |
2428 method, | |
2429 bci, | |
2430 slot, | |
2431 obj); | |
2432 } | |
2433 } | |
2434 | |
2435 // report an object referencing a class. | |
2436 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
2437 if (is_basic_heap_walk()) { | |
2438 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2439 } else { | |
2440 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
2441 } | |
2442 } | |
2443 | |
2444 // report a class referencing its class loader. | |
2445 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
2446 if (is_basic_heap_walk()) { | |
2447 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2448 } else { | |
2449 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2450 } | |
2451 } | |
2452 | |
2453 // report a class referencing its signers. | |
2454 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
2455 if (is_basic_heap_walk()) { | |
2456 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
2457 } else { | |
2458 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
2459 } | |
2460 } | |
2461 | |
2462 // report a class referencing its protection domain.. | |
2463 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
2464 if (is_basic_heap_walk()) { | |
2465 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2466 } else { | |
2467 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2468 } | |
2469 } | |
2470 | |
2471 // report a class referencing its superclass. | |
2472 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
2473 if (is_basic_heap_walk()) { | |
2474 // Send this to be consistent with past implementation | |
2475 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2476 } else { | |
2477 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); | |
2478 } | |
2479 } | |
2480 | |
2481 // report a class referencing one of its interfaces. | |
2482 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
2483 if (is_basic_heap_walk()) { | |
2484 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
2485 } else { | |
2486 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
2487 } | |
2488 } | |
2489 | |
2490 // report a class referencing one of its static fields. | |
2491 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
2492 if (is_basic_heap_walk()) { | |
2493 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2494 } else { | |
2495 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2496 } | |
2497 } | |
2498 | |
2499 // report an array referencing an element object | |
2500 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
2501 if (is_basic_heap_walk()) { | |
2502 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2503 } else { | |
2504 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2505 } | |
2506 } | |
2507 | |
2508 // report an object referencing an instance field object | |
2509 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
2510 if (is_basic_heap_walk()) { | |
2511 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
2512 } else { | |
2513 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
2514 } | |
2515 } | |
2516 | |
2517 // report an array referencing an element object | |
2518 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
2519 if (is_basic_heap_walk()) { | |
2520 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2521 } else { | |
2522 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2523 } | |
2524 } | |
2525 | |
2526 // A supporting closure used to process simple roots | |
2527 class SimpleRootsClosure : public OopClosure { | |
2528 private: | |
2529 jvmtiHeapReferenceKind _kind; | |
2530 bool _continue; | |
2531 | |
2532 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
2533 | |
2534 public: | |
2535 void set_kind(jvmtiHeapReferenceKind kind) { | |
2536 _kind = kind; | |
2537 _continue = true; | |
2538 } | |
2539 | |
2540 inline bool stopped() { | |
2541 return !_continue; | |
2542 } | |
2543 | |
2544 void do_oop(oop* obj_p) { | |
2545 // iteration has terminated | |
2546 if (stopped()) { | |
2547 return; | |
2548 } | |
2549 | |
2550 // ignore null or deleted handles | |
2551 oop o = *obj_p; | |
2552 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2553 return; | |
2554 } | |
2555 | |
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2556 assert(Universe::heap()->is_in_reserved(o), "should be impossible"); |
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2557 |
0 | 2558 jvmtiHeapReferenceKind kind = root_kind(); |
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2559 if (kind == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { |
0 | 2560 // SystemDictionary::always_strong_oops_do reports the application |
2561 // class loader as a root. We want this root to be reported as | |
2562 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
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2563 if (!o->is_instanceMirror()) { |
0 | 2564 kind = JVMTI_HEAP_REFERENCE_OTHER; |
2565 } | |
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2566 } |
0 | 2567 |
2568 // some objects are ignored - in the case of simple | |
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2569 // roots it's mostly Symbol*s that we are skipping |
0 | 2570 // here. |
2571 if (!ServiceUtil::visible_oop(o)) { | |
2572 return; | |
2573 } | |
2574 | |
2575 // invoke the callback | |
2576 _continue = CallbackInvoker::report_simple_root(kind, o); | |
2577 | |
2578 } | |
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2579 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2580 }; |
2581 | |
2582 // A supporting closure used to process JNI locals | |
2583 class JNILocalRootsClosure : public OopClosure { | |
2584 private: | |
2585 jlong _thread_tag; | |
2586 jlong _tid; | |
2587 jint _depth; | |
2588 jmethodID _method; | |
2589 bool _continue; | |
2590 public: | |
2591 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
2592 _thread_tag = thread_tag; | |
2593 _tid = tid; | |
2594 _depth = depth; | |
2595 _method = method; | |
2596 _continue = true; | |
2597 } | |
2598 | |
2599 inline bool stopped() { | |
2600 return !_continue; | |
2601 } | |
2602 | |
2603 void do_oop(oop* obj_p) { | |
2604 // iteration has terminated | |
2605 if (stopped()) { | |
2606 return; | |
2607 } | |
2608 | |
2609 // ignore null or deleted handles | |
2610 oop o = *obj_p; | |
2611 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2612 return; | |
2613 } | |
2614 | |
2615 if (!ServiceUtil::visible_oop(o)) { | |
2616 return; | |
2617 } | |
2618 | |
2619 // invoke the callback | |
2620 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
2621 } | |
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2622 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2623 }; |
2624 | |
2625 | |
2626 // A VM operation to iterate over objects that are reachable from | |
2627 // a set of roots or an initial object. | |
2628 // | |
2629 // For VM_HeapWalkOperation the set of roots used is :- | |
2630 // | |
2631 // - All JNI global references | |
2632 // - All inflated monitors | |
2633 // - All classes loaded by the boot class loader (or all classes | |
2634 // in the event that class unloading is disabled) | |
2635 // - All java threads | |
2636 // - For each java thread then all locals and JNI local references | |
2637 // on the thread's execution stack | |
2638 // - All visible/explainable objects from Universes::oops_do | |
2639 // | |
2640 class VM_HeapWalkOperation: public VM_Operation { | |
2641 private: | |
2642 enum { | |
2643 initial_visit_stack_size = 4000 | |
2644 }; | |
2645 | |
2646 bool _is_advanced_heap_walk; // indicates FollowReferences | |
2647 JvmtiTagMap* _tag_map; | |
2648 Handle _initial_object; | |
2649 GrowableArray<oop>* _visit_stack; // the visit stack | |
2650 | |
2651 bool _collecting_heap_roots; // are we collecting roots | |
2652 bool _following_object_refs; // are we following object references | |
2653 | |
2654 bool _reporting_primitive_fields; // optional reporting | |
2655 bool _reporting_primitive_array_values; | |
2656 bool _reporting_string_values; | |
2657 | |
2658 GrowableArray<oop>* create_visit_stack() { | |
6197 | 2659 return new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(initial_visit_stack_size, true); |
0 | 2660 } |
2661 | |
2662 // accessors | |
2663 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
2664 JvmtiTagMap* tag_map() const { return _tag_map; } | |
2665 Handle initial_object() const { return _initial_object; } | |
2666 | |
2667 bool is_following_references() const { return _following_object_refs; } | |
2668 | |
2669 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
2670 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
2671 bool is_reporting_string_values() const { return _reporting_string_values; } | |
2672 | |
2673 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
2674 | |
2675 // iterate over the various object types | |
2676 inline bool iterate_over_array(oop o); | |
2677 inline bool iterate_over_type_array(oop o); | |
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2678 inline bool iterate_over_class(oop o); |
0 | 2679 inline bool iterate_over_object(oop o); |
2680 | |
2681 // root collection | |
2682 inline bool collect_simple_roots(); | |
2683 inline bool collect_stack_roots(); | |
2684 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
2685 | |
2686 // visit an object | |
2687 inline bool visit(oop o); | |
2688 | |
2689 public: | |
2690 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2691 Handle initial_object, | |
2692 BasicHeapWalkContext callbacks, | |
2693 const void* user_data); | |
2694 | |
2695 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2696 Handle initial_object, | |
2697 AdvancedHeapWalkContext callbacks, | |
2698 const void* user_data); | |
2699 | |
2700 ~VM_HeapWalkOperation(); | |
2701 | |
2702 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
2703 void doit(); | |
2704 }; | |
2705 | |
2706 | |
2707 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2708 Handle initial_object, | |
2709 BasicHeapWalkContext callbacks, | |
2710 const void* user_data) { | |
2711 _is_advanced_heap_walk = false; | |
2712 _tag_map = tag_map; | |
2713 _initial_object = initial_object; | |
2714 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
2715 _reporting_primitive_fields = false; | |
2716 _reporting_primitive_array_values = false; | |
2717 _reporting_string_values = false; | |
2718 _visit_stack = create_visit_stack(); | |
2719 | |
2720 | |
2721 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2722 } | |
2723 | |
2724 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2725 Handle initial_object, | |
2726 AdvancedHeapWalkContext callbacks, | |
2727 const void* user_data) { | |
2728 _is_advanced_heap_walk = true; | |
2729 _tag_map = tag_map; | |
2730 _initial_object = initial_object; | |
2731 _following_object_refs = true; | |
2732 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
2733 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
2734 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
2735 _visit_stack = create_visit_stack(); | |
2736 | |
2737 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2738 } | |
2739 | |
2740 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
2741 if (_following_object_refs) { | |
2742 assert(_visit_stack != NULL, "checking"); | |
2743 delete _visit_stack; | |
2744 _visit_stack = NULL; | |
2745 } | |
2746 } | |
2747 | |
2748 // an array references its class and has a reference to | |
2749 // each element in the array | |
2750 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
2751 objArrayOop array = objArrayOop(o); | |
2752 | |
2753 // array reference to its class | |
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2754 oop mirror = ObjArrayKlass::cast(array->klass())->java_mirror(); |
0 | 2755 if (!CallbackInvoker::report_class_reference(o, mirror)) { |
2756 return false; | |
2757 } | |
2758 | |
2759 // iterate over the array and report each reference to a | |
2760 // non-null element | |
2761 for (int index=0; index<array->length(); index++) { | |
2762 oop elem = array->obj_at(index); | |
2763 if (elem == NULL) { | |
2764 continue; | |
2765 } | |
2766 | |
2767 // report the array reference o[index] = elem | |
2768 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
2769 return false; | |
2770 } | |
2771 } | |
2772 return true; | |
2773 } | |
2774 | |
2775 // a type array references its class | |
2776 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
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2777 Klass* k = o->klass(); |
6983 | 2778 oop mirror = k->java_mirror(); |
0 | 2779 if (!CallbackInvoker::report_class_reference(o, mirror)) { |
2780 return false; | |
2781 } | |
2782 | |
2783 // report the array contents if required | |
2784 if (is_reporting_primitive_array_values()) { | |
2785 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
2786 return false; | |
2787 } | |
2788 } | |
2789 return true; | |
2790 } | |
2791 | |
2792 // verify that a static oop field is in range | |
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2793 static inline bool verify_static_oop(InstanceKlass* ik, |
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2794 oop mirror, int offset) { |
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2795 address obj_p = (address)mirror + offset; |
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2796 address start = (address)InstanceMirrorKlass::start_of_static_fields(mirror); |
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2797 address end = start + (java_lang_Class::static_oop_field_count(mirror) * heapOopSize); |
0 | 2798 assert(end >= start, "sanity check"); |
2799 | |
2800 if (obj_p >= start && obj_p < end) { | |
2801 return true; | |
2802 } else { | |
2803 return false; | |
2804 } | |
2805 } | |
2806 | |
2807 // a class references its super class, interfaces, class loader, ... | |
2808 // and finally its static fields | |
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2809 inline bool VM_HeapWalkOperation::iterate_over_class(oop java_class) { |
0 | 2810 int i; |
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2811 Klass* klass = java_lang_Class::as_Klass(java_class); |
0 | 2812 |
2813 if (klass->oop_is_instance()) { | |
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2814 InstanceKlass* ik = InstanceKlass::cast(klass); |
0 | 2815 |
2816 // ignore the class if it's has been initialized yet | |
2817 if (!ik->is_linked()) { | |
2818 return true; | |
2819 } | |
2820 | |
2821 // get the java mirror | |
2822 oop mirror = klass->java_mirror(); | |
2823 | |
2824 // super (only if something more interesting than java.lang.Object) | |
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2825 Klass* java_super = ik->java_super(); |
1142 | 2826 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
6983 | 2827 oop super = java_super->java_mirror(); |
0 | 2828 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { |
2829 return false; | |
2830 } | |
2831 } | |
2832 | |
2833 // class loader | |
2834 oop cl = ik->class_loader(); | |
2835 if (cl != NULL) { | |
2836 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
2837 return false; | |
2838 } | |
2839 } | |
2840 | |
2841 // protection domain | |
2842 oop pd = ik->protection_domain(); | |
2843 if (pd != NULL) { | |
2844 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
2845 return false; | |
2846 } | |
2847 } | |
2848 | |
2849 // signers | |
2850 oop signers = ik->signers(); | |
2851 if (signers != NULL) { | |
2852 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
2853 return false; | |
2854 } | |
2855 } | |
2856 | |
2857 // references from the constant pool | |
2858 { | |
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2859 ConstantPool* const pool = ik->constants(); |
0 | 2860 for (int i = 1; i < pool->length(); i++) { |
2861 constantTag tag = pool->tag_at(i).value(); | |
2862 if (tag.is_string() || tag.is_klass()) { | |
2863 oop entry; | |
2864 if (tag.is_string()) { | |
2865 entry = pool->resolved_string_at(i); | |
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2866 // If the entry is non-null it is resolved. |
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2867 if (entry == NULL) continue; |
0 | 2868 } else { |
6983 | 2869 entry = pool->resolved_klass_at(i)->java_mirror(); |
0 | 2870 } |
2871 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
2872 return false; | |
2873 } | |
2874 } | |
2875 } | |
2876 } | |
2877 | |
2878 // interfaces | |
2879 // (These will already have been reported as references from the constant pool | |
2880 // but are specified by IterateOverReachableObjects and must be reported). | |
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2881 Array<Klass*>* interfaces = ik->local_interfaces(); |
0 | 2882 for (i = 0; i < interfaces->length(); i++) { |
6983 | 2883 oop interf = ((Klass*)interfaces->at(i))->java_mirror(); |
0 | 2884 if (interf == NULL) { |
2885 continue; | |
2886 } | |
2887 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
2888 return false; | |
2889 } | |
2890 } | |
2891 | |
2892 // iterate over the static fields | |
2893 | |
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2894 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
0 | 2895 for (i=0; i<field_map->field_count(); i++) { |
2896 ClassFieldDescriptor* field = field_map->field_at(i); | |
2897 char type = field->field_type(); | |
2898 if (!is_primitive_field_type(type)) { | |
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2899 oop fld_o = mirror->obj_field(field->field_offset()); |
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2900 assert(verify_static_oop(ik, mirror, field->field_offset()), "sanity check"); |
0 | 2901 if (fld_o != NULL) { |
2902 int slot = field->field_index(); | |
2903 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
2904 delete field_map; | |
2905 return false; | |
2906 } | |
2907 } | |
2908 } else { | |
2909 if (is_reporting_primitive_fields()) { | |
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2910 address addr = (address)mirror + field->field_offset(); |
0 | 2911 int slot = field->field_index(); |
2912 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
2913 delete field_map; | |
2914 return false; | |
2915 } | |
2916 } | |
2917 } | |
2918 } | |
2919 delete field_map; | |
2920 | |
2921 return true; | |
2922 } | |
2923 | |
2924 return true; | |
2925 } | |
2926 | |
2927 // an object references a class and its instance fields | |
2928 // (static fields are ignored here as we report these as | |
2929 // references from the class). | |
2930 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
2931 // reference to the class | |
6983 | 2932 if (!CallbackInvoker::report_class_reference(o, o->klass()->java_mirror())) { |
0 | 2933 return false; |
2934 } | |
2935 | |
2936 // iterate over instance fields | |
2937 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
2938 for (int i=0; i<field_map->field_count(); i++) { | |
2939 ClassFieldDescriptor* field = field_map->field_at(i); | |
2940 char type = field->field_type(); | |
2941 if (!is_primitive_field_type(type)) { | |
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2942 oop fld_o = o->obj_field(field->field_offset()); |
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2943 // ignore any objects that aren't visible to profiler |
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2944 if (fld_o != NULL && ServiceUtil::visible_oop(fld_o)) { |
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2945 assert(Universe::heap()->is_in_reserved(fld_o), "unsafe code should not " |
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2946 "have references to Klass* anymore"); |
0 | 2947 int slot = field->field_index(); |
2948 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
2949 return false; | |
2950 } | |
2951 } | |
2952 } else { | |
2953 if (is_reporting_primitive_fields()) { | |
2954 // primitive instance field | |
2955 address addr = (address)o + field->field_offset(); | |
2956 int slot = field->field_index(); | |
2957 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
2958 return false; | |
2959 } | |
2960 } | |
2961 } | |
2962 } | |
2963 | |
2964 // if the object is a java.lang.String | |
2965 if (is_reporting_string_values() && | |
1142 | 2966 o->klass() == SystemDictionary::String_klass()) { |
0 | 2967 if (!CallbackInvoker::report_string_value(o)) { |
2968 return false; | |
2969 } | |
2970 } | |
2971 return true; | |
2972 } | |
2973 | |
2974 | |
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2975 // Collects all simple (non-stack) roots except for threads; |
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2976 // threads are handled in collect_stack_roots() as an optimization. |
0 | 2977 // if there's a heap root callback provided then the callback is |
2978 // invoked for each simple root. | |
2979 // if an object reference callback is provided then all simple | |
2980 // roots are pushed onto the marking stack so that they can be | |
2981 // processed later | |
2982 // | |
2983 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
2984 SimpleRootsClosure blk; | |
2985 | |
2986 // JNI globals | |
2987 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
2988 JNIHandles::oops_do(&blk); | |
2989 if (blk.stopped()) { | |
2990 return false; | |
2991 } | |
2992 | |
2993 // Preloaded classes and loader from the system dictionary | |
2994 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
2995 SystemDictionary::always_strong_oops_do(&blk); | |
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2996 KlassToOopClosure klass_blk(&blk); |
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2997 ClassLoaderDataGraph::always_strong_oops_do(&blk, &klass_blk, false); |
0 | 2998 if (blk.stopped()) { |
2999 return false; | |
3000 } | |
3001 | |
3002 // Inflated monitors | |
3003 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
3004 ObjectSynchronizer::oops_do(&blk); | |
3005 if (blk.stopped()) { | |
3006 return false; | |
3007 } | |
3008 | |
3816
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|
3009 // threads are now handled in collect_stack_roots() |
0 | 3010 |
3011 // Other kinds of roots maintained by HotSpot | |
3012 // Many of these won't be visible but others (such as instances of important | |
3013 // exceptions) will be visible. | |
3014 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
3015 Universe::oops_do(&blk); | |
989
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6863023: need non-perm oops in code cache for JSR 292
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|
3016 |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
3017 // If there are any non-perm roots in the code cache, visit them. |
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6863023: need non-perm oops in code cache for JSR 292
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|
3018 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
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6863023: need non-perm oops in code cache for JSR 292
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|
3019 CodeBlobToOopClosure look_in_blobs(&blk, false); |
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|
3020 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
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3021 |
0 | 3022 return true; |
3023 } | |
3024 | |
3025 // Walk the stack of a given thread and find all references (locals | |
3026 // and JNI calls) and report these as stack references | |
3027 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
3028 JNILocalRootsClosure* blk) | |
3029 { | |
3030 oop threadObj = java_thread->threadObj(); | |
3031 assert(threadObj != NULL, "sanity check"); | |
3032 | |
3033 // only need to get the thread's tag once per thread | |
3034 jlong thread_tag = tag_for(_tag_map, threadObj); | |
3035 | |
3036 // also need the thread id | |
3037 jlong tid = java_lang_Thread::thread_id(threadObj); | |
3038 | |
3039 | |
3040 if (java_thread->has_last_Java_frame()) { | |
3041 | |
3042 // vframes are resource allocated | |
3043 Thread* current_thread = Thread::current(); | |
3044 ResourceMark rm(current_thread); | |
3045 HandleMark hm(current_thread); | |
3046 | |
3047 RegisterMap reg_map(java_thread); | |
3048 frame f = java_thread->last_frame(); | |
3049 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
3050 | |
3051 bool is_top_frame = true; | |
3052 int depth = 0; | |
3053 frame* last_entry_frame = NULL; | |
3054 | |
3055 while (vf != NULL) { | |
3056 if (vf->is_java_frame()) { | |
3057 | |
3058 // java frame (interpreted, compiled, ...) | |
3059 javaVFrame *jvf = javaVFrame::cast(vf); | |
3060 | |
3061 // the jmethodID | |
3062 jmethodID method = jvf->method()->jmethod_id(); | |
3063 | |
3064 if (!(jvf->method()->is_native())) { | |
3065 jlocation bci = (jlocation)jvf->bci(); | |
3066 StackValueCollection* locals = jvf->locals(); | |
3067 for (int slot=0; slot<locals->size(); slot++) { | |
3068 if (locals->at(slot)->type() == T_OBJECT) { | |
3069 oop o = locals->obj_at(slot)(); | |
3070 if (o == NULL) { | |
3071 continue; | |
3072 } | |
3073 | |
3074 // stack reference | |
3075 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
3076 bci, slot, o)) { | |
3077 return false; | |
3078 } | |
3079 } | |
3080 } | |
3081 } else { | |
3082 blk->set_context(thread_tag, tid, depth, method); | |
3083 if (is_top_frame) { | |
3084 // JNI locals for the top frame. | |
3085 java_thread->active_handles()->oops_do(blk); | |
3086 } else { | |
3087 if (last_entry_frame != NULL) { | |
3088 // JNI locals for the entry frame | |
3089 assert(last_entry_frame->is_entry_frame(), "checking"); | |
3090 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
3091 } | |
3092 } | |
3093 } | |
3094 last_entry_frame = NULL; | |
3095 depth++; | |
3096 } else { | |
3097 // externalVFrame - for an entry frame then we report the JNI locals | |
3098 // when we find the corresponding javaVFrame | |
3099 frame* fr = vf->frame_pointer(); | |
3100 assert(fr != NULL, "sanity check"); | |
3101 if (fr->is_entry_frame()) { | |
3102 last_entry_frame = fr; | |
3103 } | |
3104 } | |
3105 | |
3106 vf = vf->sender(); | |
3107 is_top_frame = false; | |
3108 } | |
3109 } else { | |
3110 // no last java frame but there may be JNI locals | |
3111 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
3112 java_thread->active_handles()->oops_do(blk); | |
3113 } | |
3114 return true; | |
3115 } | |
3116 | |
3117 | |
3816
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3118 // Collects the simple roots for all threads and collects all |
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|
3119 // stack roots - for each thread it walks the execution |
0 | 3120 // stack to find all references and local JNI refs. |
3121 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
3122 JNILocalRootsClosure blk; | |
3123 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
3124 oop threadObj = thread->threadObj(); | |
3125 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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changeset
|
3126 // Collect the simple root for this thread before we |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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changeset
|
3127 // collect its stack roots |
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changeset
|
3128 if (!CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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changeset
|
3129 threadObj)) { |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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changeset
|
3130 return false; |
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diff
changeset
|
3131 } |
0 | 3132 if (!collect_stack_roots(thread, &blk)) { |
3133 return false; | |
3134 } | |
3135 } | |
3136 } | |
3137 return true; | |
3138 } | |
3139 | |
3140 // visit an object | |
3141 // first mark the object as visited | |
3142 // second get all the outbound references from this object (in other words, all | |
3143 // the objects referenced by this object). | |
3144 // | |
3145 bool VM_HeapWalkOperation::visit(oop o) { | |
3146 // mark object as visited | |
3147 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
3148 ObjectMarker::mark(o); | |
3149 | |
3150 // instance | |
3151 if (o->is_instance()) { | |
1142 | 3152 if (o->klass() == SystemDictionary::Class_klass()) { |
6725
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6964458: Reimplement class meta-data storage to use native memory
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|
3153 if (!java_lang_Class::is_primitive(o)) { |
0 | 3154 // a java.lang.Class |
6725
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6964458: Reimplement class meta-data storage to use native memory
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|
3155 return iterate_over_class(o); |
0 | 3156 } |
3157 } else { | |
3158 return iterate_over_object(o); | |
3159 } | |
3160 } | |
3161 | |
3162 // object array | |
3163 if (o->is_objArray()) { | |
3164 return iterate_over_array(o); | |
3165 } | |
3166 | |
3167 // type array | |
3168 if (o->is_typeArray()) { | |
3169 return iterate_over_type_array(o); | |
3170 } | |
3171 | |
3172 return true; | |
3173 } | |
3174 | |
3175 void VM_HeapWalkOperation::doit() { | |
3176 ResourceMark rm; | |
3177 ObjectMarkerController marker; | |
3178 ClassFieldMapCacheMark cm; | |
3179 | |
3180 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
3181 | |
3182 // the heap walk starts with an initial object or the heap roots | |
3183 if (initial_object().is_null()) { | |
3815 | 3184 // If either collect_stack_roots() or collect_simple_roots() |
3185 // returns false at this point, then there are no mark bits | |
3186 // to reset. | |
3187 ObjectMarker::set_needs_reset(false); | |
3188 | |
3816
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|
3189 // Calling collect_stack_roots() before collect_simple_roots() |
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6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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changeset
|
3190 // can result in a big performance boost for an agent that is |
88dce6a60ac8
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changeset
|
3191 // focused on analyzing references in the thread stacks. |
88dce6a60ac8
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changeset
|
3192 if (!collect_stack_roots()) return; |
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changeset
|
3193 |
0 | 3194 if (!collect_simple_roots()) return; |
3815 | 3195 |
3196 // no early return so enable heap traversal to reset the mark bits | |
3197 ObjectMarker::set_needs_reset(true); | |
0 | 3198 } else { |
3199 visit_stack()->push(initial_object()()); | |
3200 } | |
3201 | |
3202 // object references required | |
3203 if (is_following_references()) { | |
3204 | |
3205 // visit each object until all reachable objects have been | |
3206 // visited or the callback asked to terminate the iteration. | |
3207 while (!visit_stack()->is_empty()) { | |
3208 oop o = visit_stack()->pop(); | |
3209 if (!ObjectMarker::visited(o)) { | |
3210 if (!visit(o)) { | |
3211 break; | |
3212 } | |
3213 } | |
3214 } | |
3215 } | |
3216 } | |
3217 | |
3218 // iterate over all objects that are reachable from a set of roots | |
3219 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
3220 jvmtiStackReferenceCallback stack_ref_callback, | |
3221 jvmtiObjectReferenceCallback object_ref_callback, | |
3222 const void* user_data) { | |
3223 MutexLocker ml(Heap_lock); | |
3224 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
3225 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
3226 VMThread::execute(&op); | |
3227 } | |
3228 | |
3229 // iterate over all objects that are reachable from a given object | |
3230 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
3231 jvmtiObjectReferenceCallback object_ref_callback, | |
3232 const void* user_data) { | |
3233 oop obj = JNIHandles::resolve(object); | |
3234 Handle initial_object(Thread::current(), obj); | |
3235 | |
3236 MutexLocker ml(Heap_lock); | |
3237 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
3238 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3239 VMThread::execute(&op); | |
3240 } | |
3241 | |
3242 // follow references from an initial object or the GC roots | |
3243 void JvmtiTagMap::follow_references(jint heap_filter, | |
3244 KlassHandle klass, | |
3245 jobject object, | |
3246 const jvmtiHeapCallbacks* callbacks, | |
3247 const void* user_data) | |
3248 { | |
3249 oop obj = JNIHandles::resolve(object); | |
3250 Handle initial_object(Thread::current(), obj); | |
3251 | |
3252 MutexLocker ml(Heap_lock); | |
3253 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
3254 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3255 VMThread::execute(&op); | |
3256 } | |
3257 | |
3258 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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changeset
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3259 void JvmtiTagMap::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) { |
2145
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7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
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2125
diff
changeset
|
3260 // 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
|
3261 // 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
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2125
diff
changeset
|
3262 // verification can happen in that window which gets to here. |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
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diff
changeset
|
3263 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
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2125
diff
changeset
|
3264 SafepointSynchronize::is_at_safepoint(), |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3265 "must be executed at a safepoint"); |
0 | 3266 if (JvmtiEnv::environments_might_exist()) { |
3267 JvmtiEnvIterator it; | |
3268 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
3269 JvmtiTagMap* tag_map = env->tag_map(); | |
3270 if (tag_map != NULL && !tag_map->is_empty()) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3271 tag_map->do_weak_oops(is_alive, f); |
0 | 3272 } |
3273 } | |
3274 } | |
3275 } | |
3276 | |
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3277 void JvmtiTagMap::do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f) { |
0 | 3278 |
3279 // does this environment have the OBJECT_FREE event enabled | |
3280 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
3281 | |
3282 // counters used for trace message | |
3283 int freed = 0; | |
3284 int moved = 0; | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3285 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3286 JvmtiTagHashmap* hashmap = this->hashmap(); |
0 | 3287 |
3288 // reenable sizing (if disabled) | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3289 hashmap->set_resizing_enabled(true); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3290 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3291 // if the hashmap is empty then we can skip it |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3292 if (hashmap->_entry_count == 0) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3293 return; |
0 | 3294 } |
3295 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3296 // now iterate through each entry in the table |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3297 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3298 JvmtiTagHashmapEntry** table = hashmap->table(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3299 int size = hashmap->size(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3300 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3301 JvmtiTagHashmapEntry* delayed_add = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3302 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3303 for (int pos = 0; pos < size; ++pos) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3304 JvmtiTagHashmapEntry* entry = table[pos]; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3305 JvmtiTagHashmapEntry* prev = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3306 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3307 while (entry != NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3308 JvmtiTagHashmapEntry* next = entry->next(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3309 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
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diff
changeset
|
3310 oop* obj = entry->object_addr(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3311 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3312 // has object been GC'ed |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3313 if (!is_alive->do_object_b(entry->object())) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3314 // grab the tag |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3315 jlong tag = entry->tag(); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3316 guarantee(tag != 0, "checking"); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3317 |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3318 // remove GC'ed entry from hashmap and return the |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3319 // entry to the free list |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
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diff
changeset
|
3320 hashmap->remove(prev, pos, entry); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3321 destroy_entry(entry); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3322 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3323 // post the event to the profiler |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3324 if (post_object_free) { |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3325 JvmtiExport::post_object_free(env(), tag); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3326 } |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3327 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3328 ++freed; |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3329 } else { |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3330 f->do_oop(entry->object_addr()); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3331 oop new_oop = entry->object(); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3332 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3333 // 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
|
3334 // entry to its new location. |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3335 unsigned int new_pos = JvmtiTagHashmap::hash(new_oop, size); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3336 if (new_pos != (unsigned int)pos) { |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3337 if (prev == NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3338 table[pos] = next; |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3339 } else { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3340 prev->set_next(next); |
0 | 3341 } |
2125
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kamg
parents:
1972
diff
changeset
|
3342 if (new_pos < (unsigned int)pos) { |
0 | 3343 entry->set_next(table[new_pos]); |
3344 table[new_pos] = entry; | |
3345 } else { | |
2125
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kamg
parents:
1972
diff
changeset
|
3346 // Delay adding this entry to it's new position as we'd end up |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3347 // hitting it again during this iteration. |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3348 entry->set_next(delayed_add); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3349 delayed_add = entry; |
0 | 3350 } |
2125
7246a374a9f2
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kamg
parents:
1972
diff
changeset
|
3351 moved++; |
0 | 3352 } else { |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3353 // object didn't move |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3354 prev = entry; |
0 | 3355 } |
3356 } | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3357 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3358 entry = next; |
0 | 3359 } |
3360 } | |
3361 | |
2125
7246a374a9f2
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kamg
parents:
1972
diff
changeset
|
3362 // Re-add all the entries which were kept aside |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3363 while (delayed_add != NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3364 JvmtiTagHashmapEntry* next = delayed_add->next(); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3365 unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3366 delayed_add->set_next(table[pos]); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3367 table[pos] = delayed_add; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3368 delayed_add = next; |
0 | 3369 } |
3370 | |
3371 // stats | |
3372 if (TraceJVMTIObjectTagging) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3373 int post_total = hashmap->_entry_count; |
0 | 3374 int pre_total = post_total + freed; |
3375 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3376 tty->print_cr("(%d->%d, %d freed, %d total moves)", |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3377 pre_total, post_total, freed, moved); |
0 | 3378 } |
3379 } |