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annotate src/share/vm/prims/jvmtiTagMap.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
author | stefank |
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date | Tue, 23 Nov 2010 13:22:55 -0800 |
parents | c18cbe5936b8 |
children | 7246a374a9f2 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "jvmtifiles/jvmtiEnv.hpp" | |
30 #include "oops/objArrayKlass.hpp" | |
31 #include "oops/oop.inline2.hpp" | |
32 #include "prims/jvmtiEventController.hpp" | |
33 #include "prims/jvmtiEventController.inline.hpp" | |
34 #include "prims/jvmtiExport.hpp" | |
35 #include "prims/jvmtiImpl.hpp" | |
36 #include "prims/jvmtiTagMap.hpp" | |
37 #include "runtime/biasedLocking.hpp" | |
38 #include "runtime/javaCalls.hpp" | |
39 #include "runtime/jniHandles.hpp" | |
40 #include "runtime/mutex.hpp" | |
41 #include "runtime/mutexLocker.hpp" | |
42 #include "runtime/reflectionUtils.hpp" | |
43 #include "runtime/vframe.hpp" | |
44 #include "runtime/vmThread.hpp" | |
45 #include "runtime/vm_operations.hpp" | |
46 #include "services/serviceUtil.hpp" | |
47 #ifndef SERIALGC | |
48 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
49 #endif | |
0 | 50 |
51 // JvmtiTagHashmapEntry | |
52 // | |
53 // Each entry encapsulates a JNI weak reference to the tagged object | |
54 // and the tag value. In addition an entry includes a next pointer which | |
55 // is used to chain entries together. | |
56 | |
57 class JvmtiTagHashmapEntry : public CHeapObj { | |
58 private: | |
59 friend class JvmtiTagMap; | |
60 | |
61 jweak _object; // JNI weak ref to tagged object | |
62 jlong _tag; // the tag | |
63 JvmtiTagHashmapEntry* _next; // next on the list | |
64 | |
65 inline void init(jweak object, jlong tag) { | |
66 _object = object; | |
67 _tag = tag; | |
68 _next = NULL; | |
69 } | |
70 | |
71 // constructor | |
72 JvmtiTagHashmapEntry(jweak object, jlong tag) { init(object, tag); } | |
73 | |
74 public: | |
75 | |
76 // accessor methods | |
77 inline jweak object() const { return _object; } | |
78 inline jlong tag() const { return _tag; } | |
79 | |
80 inline void set_tag(jlong tag) { | |
81 assert(tag != 0, "can't be zero"); | |
82 _tag = tag; | |
83 } | |
84 | |
85 inline JvmtiTagHashmapEntry* next() const { return _next; } | |
86 inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; } | |
87 }; | |
88 | |
89 | |
90 // JvmtiTagHashmap | |
91 // | |
92 // A hashmap is essentially a table of pointers to entries. Entries | |
93 // are hashed to a location, or position in the table, and then | |
94 // chained from that location. The "key" for hashing is address of | |
95 // the object, or oop. The "value" is the JNI weak reference to the | |
96 // object and the tag value. Keys are not stored with the entry. | |
97 // Instead the weak reference is resolved to obtain the key. | |
98 // | |
99 // A hashmap maintains a count of the number entries in the hashmap | |
100 // and resizes if the number of entries exceeds a given threshold. | |
101 // The threshold is specified as a percentage of the size - for | |
102 // example a threshold of 0.75 will trigger the hashmap to resize | |
103 // if the number of entries is >75% of table size. | |
104 // | |
105 // A hashmap provides functions for adding, removing, and finding | |
106 // entries. It also provides a function to iterate over all entries | |
107 // in the hashmap. | |
108 | |
109 class JvmtiTagHashmap : public CHeapObj { | |
110 private: | |
111 friend class JvmtiTagMap; | |
112 | |
113 enum { | |
114 small_trace_threshold = 10000, // threshold for tracing | |
115 medium_trace_threshold = 100000, | |
116 large_trace_threshold = 1000000, | |
117 initial_trace_threshold = small_trace_threshold | |
118 }; | |
119 | |
120 static int _sizes[]; // array of possible hashmap sizes | |
121 int _size; // actual size of the table | |
122 int _size_index; // index into size table | |
123 | |
124 int _entry_count; // number of entries in the hashmap | |
125 | |
126 float _load_factor; // load factor as a % of the size | |
127 int _resize_threshold; // computed threshold to trigger resizing. | |
128 bool _resizing_enabled; // indicates if hashmap can resize | |
129 | |
130 int _trace_threshold; // threshold for trace messages | |
131 | |
132 JvmtiTagHashmapEntry** _table; // the table of entries. | |
133 | |
134 // private accessors | |
135 int resize_threshold() const { return _resize_threshold; } | |
136 int trace_threshold() const { return _trace_threshold; } | |
137 | |
138 // initialize the hashmap | |
139 void init(int size_index=0, float load_factor=4.0f) { | |
140 int initial_size = _sizes[size_index]; | |
141 _size_index = size_index; | |
142 _size = initial_size; | |
143 _entry_count = 0; | |
144 if (TraceJVMTIObjectTagging) { | |
145 _trace_threshold = initial_trace_threshold; | |
146 } else { | |
147 _trace_threshold = -1; | |
148 } | |
149 _load_factor = load_factor; | |
150 _resize_threshold = (int)(_load_factor * _size); | |
151 _resizing_enabled = true; | |
152 size_t s = initial_size * sizeof(JvmtiTagHashmapEntry*); | |
153 _table = (JvmtiTagHashmapEntry**)os::malloc(s); | |
154 if (_table == NULL) { | |
155 vm_exit_out_of_memory(s, "unable to allocate initial hashtable for jvmti object tags"); | |
156 } | |
157 for (int i=0; i<initial_size; i++) { | |
158 _table[i] = NULL; | |
159 } | |
160 } | |
161 | |
162 // hash a given key (oop) with the specified size | |
163 static unsigned int hash(oop key, int size) { | |
164 // shift right to get better distribution (as these bits will be zero | |
165 // with aligned addresses) | |
166 unsigned int addr = (unsigned int)((intptr_t)key); | |
167 #ifdef _LP64 | |
168 return (addr >> 3) % size; | |
169 #else | |
170 return (addr >> 2) % size; | |
171 #endif | |
172 } | |
173 | |
174 // hash a given key (oop) | |
175 unsigned int hash(oop key) { | |
176 return hash(key, _size); | |
177 } | |
178 | |
179 // resize the hashmap - allocates a large table and re-hashes | |
180 // all entries into the new table. | |
181 void resize() { | |
182 int new_size_index = _size_index+1; | |
183 int new_size = _sizes[new_size_index]; | |
184 if (new_size < 0) { | |
185 // hashmap already at maximum capacity | |
186 return; | |
187 } | |
188 | |
189 // allocate new table | |
190 size_t s = new_size * sizeof(JvmtiTagHashmapEntry*); | |
191 JvmtiTagHashmapEntry** new_table = (JvmtiTagHashmapEntry**)os::malloc(s); | |
192 if (new_table == NULL) { | |
193 warning("unable to allocate larger hashtable for jvmti object tags"); | |
194 set_resizing_enabled(false); | |
195 return; | |
196 } | |
197 | |
198 // initialize new table | |
199 int i; | |
200 for (i=0; i<new_size; i++) { | |
201 new_table[i] = NULL; | |
202 } | |
203 | |
204 // rehash all entries into the new table | |
205 for (i=0; i<_size; i++) { | |
206 JvmtiTagHashmapEntry* entry = _table[i]; | |
207 while (entry != NULL) { | |
208 JvmtiTagHashmapEntry* next = entry->next(); | |
209 oop key = JNIHandles::resolve(entry->object()); | |
210 assert(key != NULL, "jni weak reference cleared!!"); | |
211 unsigned int h = hash(key, new_size); | |
212 JvmtiTagHashmapEntry* anchor = new_table[h]; | |
213 if (anchor == NULL) { | |
214 new_table[h] = entry; | |
215 entry->set_next(NULL); | |
216 } else { | |
217 entry->set_next(anchor); | |
218 new_table[h] = entry; | |
219 } | |
220 entry = next; | |
221 } | |
222 } | |
223 | |
224 // free old table and update settings. | |
225 os::free((void*)_table); | |
226 _table = new_table; | |
227 _size_index = new_size_index; | |
228 _size = new_size; | |
229 | |
230 // compute new resize threshold | |
231 _resize_threshold = (int)(_load_factor * _size); | |
232 } | |
233 | |
234 | |
235 // internal remove function - remove an entry at a given position in the | |
236 // table. | |
237 inline void remove(JvmtiTagHashmapEntry* prev, int pos, JvmtiTagHashmapEntry* entry) { | |
238 assert(pos >= 0 && pos < _size, "out of range"); | |
239 if (prev == NULL) { | |
240 _table[pos] = entry->next(); | |
241 } else { | |
242 prev->set_next(entry->next()); | |
243 } | |
244 assert(_entry_count > 0, "checking"); | |
245 _entry_count--; | |
246 } | |
247 | |
248 // resizing switch | |
249 bool is_resizing_enabled() const { return _resizing_enabled; } | |
250 void set_resizing_enabled(bool enable) { _resizing_enabled = enable; } | |
251 | |
252 // debugging | |
253 void print_memory_usage(); | |
254 void compute_next_trace_threshold(); | |
255 | |
256 public: | |
257 | |
258 // create a JvmtiTagHashmap of a preferred size and optionally a load factor. | |
259 // The preferred size is rounded down to an actual size. | |
260 JvmtiTagHashmap(int size, float load_factor=0.0f) { | |
261 int i=0; | |
262 while (_sizes[i] < size) { | |
263 if (_sizes[i] < 0) { | |
264 assert(i > 0, "sanity check"); | |
265 i--; | |
266 break; | |
267 } | |
268 i++; | |
269 } | |
270 | |
271 // if a load factor is specified then use it, otherwise use default | |
272 if (load_factor > 0.01f) { | |
273 init(i, load_factor); | |
274 } else { | |
275 init(i); | |
276 } | |
277 } | |
278 | |
279 // create a JvmtiTagHashmap with default settings | |
280 JvmtiTagHashmap() { | |
281 init(); | |
282 } | |
283 | |
284 // release table when JvmtiTagHashmap destroyed | |
285 ~JvmtiTagHashmap() { | |
286 if (_table != NULL) { | |
287 os::free((void*)_table); | |
288 _table = NULL; | |
289 } | |
290 } | |
291 | |
292 // accessors | |
293 int size() const { return _size; } | |
294 JvmtiTagHashmapEntry** table() const { return _table; } | |
295 int entry_count() const { return _entry_count; } | |
296 | |
297 // find an entry in the hashmap, returns NULL if not found. | |
298 inline JvmtiTagHashmapEntry* find(oop key) { | |
299 unsigned int h = hash(key); | |
300 JvmtiTagHashmapEntry* entry = _table[h]; | |
301 while (entry != NULL) { | |
302 oop orig_key = JNIHandles::resolve(entry->object()); | |
303 assert(orig_key != NULL, "jni weak reference cleared!!"); | |
304 if (key == orig_key) { | |
305 break; | |
306 } | |
307 entry = entry->next(); | |
308 } | |
309 return entry; | |
310 } | |
311 | |
312 | |
313 // add a new entry to hashmap | |
314 inline void add(oop key, JvmtiTagHashmapEntry* entry) { | |
315 assert(key != NULL, "checking"); | |
316 assert(find(key) == NULL, "duplicate detected"); | |
317 unsigned int h = hash(key); | |
318 JvmtiTagHashmapEntry* anchor = _table[h]; | |
319 if (anchor == NULL) { | |
320 _table[h] = entry; | |
321 entry->set_next(NULL); | |
322 } else { | |
323 entry->set_next(anchor); | |
324 _table[h] = entry; | |
325 } | |
326 | |
327 _entry_count++; | |
328 if (trace_threshold() > 0 && entry_count() >= trace_threshold()) { | |
329 assert(TraceJVMTIObjectTagging, "should only get here when tracing"); | |
330 print_memory_usage(); | |
331 compute_next_trace_threshold(); | |
332 } | |
333 | |
334 // if the number of entries exceed the threshold then resize | |
335 if (entry_count() > resize_threshold() && is_resizing_enabled()) { | |
336 resize(); | |
337 } | |
338 } | |
339 | |
340 // remove an entry with the given key. | |
341 inline JvmtiTagHashmapEntry* remove(oop key) { | |
342 unsigned int h = hash(key); | |
343 JvmtiTagHashmapEntry* entry = _table[h]; | |
344 JvmtiTagHashmapEntry* prev = NULL; | |
345 while (entry != NULL) { | |
346 oop orig_key = JNIHandles::resolve(entry->object()); | |
347 assert(orig_key != NULL, "jni weak reference cleared!!"); | |
348 if (key == orig_key) { | |
349 break; | |
350 } | |
351 prev = entry; | |
352 entry = entry->next(); | |
353 } | |
354 if (entry != NULL) { | |
355 remove(prev, h, entry); | |
356 } | |
357 return entry; | |
358 } | |
359 | |
360 // iterate over all entries in the hashmap | |
361 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); | |
362 }; | |
363 | |
364 // possible hashmap sizes - odd primes that roughly double in size. | |
365 // To avoid excessive resizing the odd primes from 4801-76831 and | |
366 // 76831-307261 have been removed. The list must be terminated by -1. | |
367 int JvmtiTagHashmap::_sizes[] = { 4801, 76831, 307261, 614563, 1228891, | |
368 2457733, 4915219, 9830479, 19660831, 39321619, 78643219, -1 }; | |
369 | |
370 | |
371 // A supporting class for iterating over all entries in Hashmap | |
372 class JvmtiTagHashmapEntryClosure { | |
373 public: | |
374 virtual void do_entry(JvmtiTagHashmapEntry* entry) = 0; | |
375 }; | |
376 | |
377 | |
378 // iterate over all entries in the hashmap | |
379 void JvmtiTagHashmap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
380 for (int i=0; i<_size; i++) { | |
381 JvmtiTagHashmapEntry* entry = _table[i]; | |
382 JvmtiTagHashmapEntry* prev = NULL; | |
383 while (entry != NULL) { | |
384 // obtain the next entry before invoking do_entry - this is | |
385 // necessary because do_entry may remove the entry from the | |
386 // hashmap. | |
387 JvmtiTagHashmapEntry* next = entry->next(); | |
388 closure->do_entry(entry); | |
389 entry = next; | |
390 } | |
391 } | |
392 } | |
393 | |
394 // debugging | |
395 void JvmtiTagHashmap::print_memory_usage() { | |
396 intptr_t p = (intptr_t)this; | |
397 tty->print("[JvmtiTagHashmap @ " INTPTR_FORMAT, p); | |
398 | |
399 // table + entries in KB | |
400 int hashmap_usage = (size()*sizeof(JvmtiTagHashmapEntry*) + | |
401 entry_count()*sizeof(JvmtiTagHashmapEntry))/K; | |
402 | |
403 int weak_globals_usage = (int)(JNIHandles::weak_global_handle_memory_usage()/K); | |
404 tty->print_cr(", %d entries (%d KB) <JNI weak globals: %d KB>]", | |
405 entry_count(), hashmap_usage, weak_globals_usage); | |
406 } | |
407 | |
408 // compute threshold for the next trace message | |
409 void JvmtiTagHashmap::compute_next_trace_threshold() { | |
410 if (trace_threshold() < medium_trace_threshold) { | |
411 _trace_threshold += small_trace_threshold; | |
412 } else { | |
413 if (trace_threshold() < large_trace_threshold) { | |
414 _trace_threshold += medium_trace_threshold; | |
415 } else { | |
416 _trace_threshold += large_trace_threshold; | |
417 } | |
418 } | |
419 } | |
420 | |
421 // memory region for young generation | |
422 MemRegion JvmtiTagMap::_young_gen; | |
423 | |
424 // get the memory region used for the young generation | |
425 void JvmtiTagMap::get_young_generation() { | |
342
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426 CollectedHeap* ch = Universe::heap(); |
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427 switch (ch->kind()) { |
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428 case (CollectedHeap::GenCollectedHeap): { |
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429 _young_gen = ((GenCollectedHeap*)ch)->get_gen(0)->reserved(); |
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430 break; |
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431 } |
0 | 432 #ifndef SERIALGC |
342
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433 case (CollectedHeap::ParallelScavengeHeap): { |
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434 _young_gen = ((ParallelScavengeHeap*)ch)->young_gen()->reserved(); |
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435 break; |
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436 } |
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437 case (CollectedHeap::G1CollectedHeap): { |
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438 // Until a more satisfactory solution is implemented, all |
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439 // oops in the tag map will require rehash at each gc. |
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440 // This is a correct, if extremely inefficient solution. |
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441 // See RFE 6621729 for related commentary. |
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442 _young_gen = ch->reserved_region(); |
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443 break; |
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444 } |
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445 #endif // !SERIALGC |
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446 default: |
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447 ShouldNotReachHere(); |
0 | 448 } |
449 } | |
450 | |
451 // returns true if oop is in the young generation | |
452 inline bool JvmtiTagMap::is_in_young(oop o) { | |
453 assert(_young_gen.start() != NULL, "checking"); | |
454 void* p = (void*)o; | |
455 bool in_young = _young_gen.contains(p); | |
456 return in_young; | |
457 } | |
458 | |
459 // returns the appropriate hashmap for a given object | |
460 inline JvmtiTagHashmap* JvmtiTagMap::hashmap_for(oop o) { | |
461 if (is_in_young(o)) { | |
462 return _hashmap[0]; | |
463 } else { | |
464 return _hashmap[1]; | |
465 } | |
466 } | |
467 | |
468 | |
469 // create a JvmtiTagMap | |
470 JvmtiTagMap::JvmtiTagMap(JvmtiEnv* env) : | |
471 _env(env), | |
472 _lock(Mutex::nonleaf+2, "JvmtiTagMap._lock", false), | |
473 _free_entries(NULL), | |
474 _free_entries_count(0) | |
475 { | |
476 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
477 assert(((JvmtiEnvBase *)env)->tag_map() == NULL, "tag map already exists for environment"); | |
478 | |
479 // create the hashmaps | |
480 for (int i=0; i<n_hashmaps; i++) { | |
481 _hashmap[i] = new JvmtiTagHashmap(); | |
482 } | |
483 | |
484 // get the memory region used by the young generation | |
485 get_young_generation(); | |
486 | |
487 // finally add us to the environment | |
488 ((JvmtiEnvBase *)env)->set_tag_map(this); | |
489 } | |
490 | |
491 | |
492 // destroy a JvmtiTagMap | |
493 JvmtiTagMap::~JvmtiTagMap() { | |
494 | |
495 // no lock acquired as we assume the enclosing environment is | |
496 // also being destroryed. | |
497 ((JvmtiEnvBase *)_env)->set_tag_map(NULL); | |
498 | |
499 // iterate over the hashmaps and destroy each of the entries | |
500 for (int i=0; i<n_hashmaps; i++) { | |
501 JvmtiTagHashmap* hashmap = _hashmap[i]; | |
502 JvmtiTagHashmapEntry** table = hashmap->table(); | |
503 for (int j=0; j<hashmap->size(); j++) { | |
504 JvmtiTagHashmapEntry *entry = table[j]; | |
505 while (entry != NULL) { | |
506 JvmtiTagHashmapEntry* next = entry->next(); | |
507 jweak ref = entry->object(); | |
508 JNIHandles::destroy_weak_global(ref); | |
509 delete entry; | |
510 entry = next; | |
511 } | |
512 } | |
513 | |
514 // finally destroy the hashmap | |
515 delete hashmap; | |
516 } | |
517 | |
518 // remove any entries on the free list | |
519 JvmtiTagHashmapEntry* entry = _free_entries; | |
520 while (entry != NULL) { | |
521 JvmtiTagHashmapEntry* next = entry->next(); | |
522 delete entry; | |
523 entry = next; | |
524 } | |
525 } | |
526 | |
527 // create a hashmap entry | |
528 // - if there's an entry on the (per-environment) free list then this | |
529 // is returned. Otherwise an new entry is allocated. | |
530 JvmtiTagHashmapEntry* JvmtiTagMap::create_entry(jweak ref, jlong tag) { | |
531 assert(Thread::current()->is_VM_thread() || is_locked(), "checking"); | |
532 JvmtiTagHashmapEntry* entry; | |
533 if (_free_entries == NULL) { | |
534 entry = new JvmtiTagHashmapEntry(ref, tag); | |
535 } else { | |
536 assert(_free_entries_count > 0, "mismatched _free_entries_count"); | |
537 _free_entries_count--; | |
538 entry = _free_entries; | |
539 _free_entries = entry->next(); | |
540 entry->init(ref, tag); | |
541 } | |
542 return entry; | |
543 } | |
544 | |
545 // destroy an entry by returning it to the free list | |
546 void JvmtiTagMap::destroy_entry(JvmtiTagHashmapEntry* entry) { | |
547 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
548 // limit the size of the free list | |
549 if (_free_entries_count >= max_free_entries) { | |
550 delete entry; | |
551 } else { | |
552 entry->set_next(_free_entries); | |
553 _free_entries = entry; | |
554 _free_entries_count++; | |
555 } | |
556 } | |
557 | |
558 // returns the tag map for the given environments. If the tag map | |
559 // doesn't exist then it is created. | |
560 JvmtiTagMap* JvmtiTagMap::tag_map_for(JvmtiEnv* env) { | |
561 JvmtiTagMap* tag_map = ((JvmtiEnvBase *)env)->tag_map(); | |
562 if (tag_map == NULL) { | |
563 MutexLocker mu(JvmtiThreadState_lock); | |
564 tag_map = ((JvmtiEnvBase *)env)->tag_map(); | |
565 if (tag_map == NULL) { | |
566 tag_map = new JvmtiTagMap(env); | |
567 } | |
568 } else { | |
569 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
570 } | |
571 return tag_map; | |
572 } | |
573 | |
574 // iterate over all entries in the tag map. | |
575 void JvmtiTagMap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
576 for (int i=0; i<n_hashmaps; i++) { | |
577 JvmtiTagHashmap* hashmap = _hashmap[i]; | |
578 hashmap->entry_iterate(closure); | |
579 } | |
580 } | |
581 | |
582 // returns true if the hashmaps are empty | |
583 bool JvmtiTagMap::is_empty() { | |
584 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
585 assert(n_hashmaps == 2, "not implemented"); | |
586 return ((_hashmap[0]->entry_count() == 0) && (_hashmap[1]->entry_count() == 0)); | |
587 } | |
588 | |
589 | |
590 // Return the tag value for an object, or 0 if the object is | |
591 // not tagged | |
592 // | |
593 static inline jlong tag_for(JvmtiTagMap* tag_map, oop o) { | |
594 JvmtiTagHashmapEntry* entry = tag_map->hashmap_for(o)->find(o); | |
595 if (entry == NULL) { | |
596 return 0; | |
597 } else { | |
598 return entry->tag(); | |
599 } | |
600 } | |
601 | |
602 // If the object is a java.lang.Class then return the klassOop, | |
603 // otherwise return the original object | |
604 static inline oop klassOop_if_java_lang_Class(oop o) { | |
1142 | 605 if (o->klass() == SystemDictionary::Class_klass()) { |
0 | 606 if (!java_lang_Class::is_primitive(o)) { |
607 o = (oop)java_lang_Class::as_klassOop(o); | |
608 assert(o != NULL, "class for non-primitive mirror must exist"); | |
609 } | |
610 } | |
611 return o; | |
612 } | |
613 | |
614 // A CallbackWrapper is a support class for querying and tagging an object | |
615 // around a callback to a profiler. The constructor does pre-callback | |
616 // work to get the tag value, klass tag value, ... and the destructor | |
617 // does the post-callback work of tagging or untagging the object. | |
618 // | |
619 // { | |
620 // CallbackWrapper wrapper(tag_map, o); | |
621 // | |
622 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
623 // | |
624 // } // wrapper goes out of scope here which results in the destructor | |
625 // checking to see if the object has been tagged, untagged, or the | |
626 // tag value has changed. | |
627 // | |
628 class CallbackWrapper : public StackObj { | |
629 private: | |
630 JvmtiTagMap* _tag_map; | |
631 JvmtiTagHashmap* _hashmap; | |
632 JvmtiTagHashmapEntry* _entry; | |
633 oop _o; | |
634 jlong _obj_size; | |
635 jlong _obj_tag; | |
636 klassOop _klass; // the object's class | |
637 jlong _klass_tag; | |
638 | |
639 protected: | |
640 JvmtiTagMap* tag_map() const { return _tag_map; } | |
641 | |
642 // invoked post-callback to tag, untag, or update the tag of an object | |
643 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
644 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
645 public: | |
646 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
647 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
648 "MT unsafe or must be VM thread"); | |
649 | |
650 // for Classes the klassOop is tagged | |
651 _o = klassOop_if_java_lang_Class(o); | |
652 | |
653 // object size | |
654 _obj_size = _o->size() * wordSize; | |
655 | |
656 // record the context | |
657 _tag_map = tag_map; | |
658 _hashmap = tag_map->hashmap_for(_o); | |
659 _entry = _hashmap->find(_o); | |
660 | |
661 // get object tag | |
662 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
663 | |
664 // get the class and the class's tag value | |
665 if (_o == o) { | |
666 _klass = _o->klass(); | |
667 } else { | |
668 // if the object represents a runtime class then use the | |
669 // tag for java.lang.Class | |
1142 | 670 _klass = SystemDictionary::Class_klass(); |
0 | 671 } |
672 _klass_tag = tag_for(tag_map, _klass); | |
673 } | |
674 | |
675 ~CallbackWrapper() { | |
676 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
677 } | |
678 | |
679 inline jlong* obj_tag_p() { return &_obj_tag; } | |
680 inline jlong obj_size() const { return _obj_size; } | |
681 inline jlong obj_tag() const { return _obj_tag; } | |
682 inline klassOop klass() const { return _klass; } | |
683 inline jlong klass_tag() const { return _klass_tag; } | |
684 }; | |
685 | |
686 | |
687 | |
688 // callback post-callback to tag, untag, or update the tag of an object | |
689 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
690 JvmtiTagHashmap* hashmap, | |
691 JvmtiTagHashmapEntry* entry, | |
692 jlong obj_tag) { | |
693 if (entry == NULL) { | |
694 if (obj_tag != 0) { | |
695 // callback has tagged the object | |
696 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
697 HandleMark hm; | |
698 Handle h(o); | |
699 jweak ref = JNIHandles::make_weak_global(h); | |
700 entry = tag_map()->create_entry(ref, obj_tag); | |
701 hashmap->add(o, entry); | |
702 } | |
703 } else { | |
704 // object was previously tagged - the callback may have untagged | |
705 // the object or changed the tag value | |
706 if (obj_tag == 0) { | |
707 jweak ref = entry->object(); | |
708 | |
709 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
710 assert(entry_removed == entry, "checking"); | |
711 tag_map()->destroy_entry(entry); | |
712 | |
713 JNIHandles::destroy_weak_global(ref); | |
714 } else { | |
715 if (obj_tag != entry->tag()) { | |
716 entry->set_tag(obj_tag); | |
717 } | |
718 } | |
719 } | |
720 } | |
721 | |
722 // An extended CallbackWrapper used when reporting an object reference | |
723 // to the agent. | |
724 // | |
725 // { | |
726 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
727 // | |
728 // (*callback)(wrapper.klass_tag(), | |
729 // wrapper.obj_size(), | |
730 // wrapper.obj_tag_p() | |
731 // wrapper.referrer_tag_p(), ...) | |
732 // | |
733 // } // wrapper goes out of scope here which results in the destructor | |
734 // checking to see if the referrer object has been tagged, untagged, | |
735 // or the tag value has changed. | |
736 // | |
737 class TwoOopCallbackWrapper : public CallbackWrapper { | |
738 private: | |
739 bool _is_reference_to_self; | |
740 JvmtiTagHashmap* _referrer_hashmap; | |
741 JvmtiTagHashmapEntry* _referrer_entry; | |
742 oop _referrer; | |
743 jlong _referrer_obj_tag; | |
744 jlong _referrer_klass_tag; | |
745 jlong* _referrer_tag_p; | |
746 | |
747 bool is_reference_to_self() const { return _is_reference_to_self; } | |
748 | |
749 public: | |
750 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
751 CallbackWrapper(tag_map, o) | |
752 { | |
753 // self reference needs to be handled in a special way | |
754 _is_reference_to_self = (referrer == o); | |
755 | |
756 if (_is_reference_to_self) { | |
757 _referrer_klass_tag = klass_tag(); | |
758 _referrer_tag_p = obj_tag_p(); | |
759 } else { | |
760 // for Classes the klassOop is tagged | |
761 _referrer = klassOop_if_java_lang_Class(referrer); | |
762 // record the context | |
763 _referrer_hashmap = tag_map->hashmap_for(_referrer); | |
764 _referrer_entry = _referrer_hashmap->find(_referrer); | |
765 | |
766 // get object tag | |
767 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
768 _referrer_tag_p = &_referrer_obj_tag; | |
769 | |
770 // get referrer class tag. | |
771 klassOop k = (_referrer == referrer) ? // Check if referrer is a class... | |
772 _referrer->klass() // No, just get its class | |
1142 | 773 : SystemDictionary::Class_klass(); // Yes, its class is Class |
0 | 774 _referrer_klass_tag = tag_for(tag_map, k); |
775 } | |
776 } | |
777 | |
778 ~TwoOopCallbackWrapper() { | |
779 if (!is_reference_to_self()){ | |
780 post_callback_tag_update(_referrer, | |
781 _referrer_hashmap, | |
782 _referrer_entry, | |
783 _referrer_obj_tag); | |
784 } | |
785 } | |
786 | |
787 // address of referrer tag | |
788 // (for a self reference this will return the same thing as obj_tag_p()) | |
789 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
790 | |
791 // referrer's class tag | |
792 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
793 }; | |
794 | |
795 // tag an object | |
796 // | |
797 // This function is performance critical. If many threads attempt to tag objects | |
798 // around the same time then it's possible that the Mutex associated with the | |
799 // tag map will be a hot lock. Eliminating this lock will not eliminate the issue | |
800 // because creating a JNI weak reference requires acquiring a global lock also. | |
801 void JvmtiTagMap::set_tag(jobject object, jlong tag) { | |
802 MutexLocker ml(lock()); | |
803 | |
804 // resolve the object | |
805 oop o = JNIHandles::resolve_non_null(object); | |
806 | |
807 // for Classes we tag the klassOop | |
808 o = klassOop_if_java_lang_Class(o); | |
809 | |
810 // see if the object is already tagged | |
811 JvmtiTagHashmap* hashmap = hashmap_for(o); | |
812 JvmtiTagHashmapEntry* entry = hashmap->find(o); | |
813 | |
814 // if the object is not already tagged then we tag it | |
815 if (entry == NULL) { | |
816 if (tag != 0) { | |
817 HandleMark hm; | |
818 Handle h(o); | |
819 jweak ref = JNIHandles::make_weak_global(h); | |
820 | |
821 // the object may have moved because make_weak_global may | |
822 // have blocked - thus it is necessary resolve the handle | |
823 // and re-hash the object. | |
824 o = h(); | |
825 entry = create_entry(ref, tag); | |
826 hashmap_for(o)->add(o, entry); | |
827 } else { | |
828 // no-op | |
829 } | |
830 } else { | |
831 // if the object is already tagged then we either update | |
832 // the tag (if a new tag value has been provided) | |
833 // or remove the object if the new tag value is 0. | |
834 // Removing the object requires that we also delete the JNI | |
835 // weak ref to the object. | |
836 if (tag == 0) { | |
837 jweak ref = entry->object(); | |
838 hashmap->remove(o); | |
839 destroy_entry(entry); | |
840 JNIHandles::destroy_weak_global(ref); | |
841 } else { | |
842 entry->set_tag(tag); | |
843 } | |
844 } | |
845 } | |
846 | |
847 // get the tag for an object | |
848 jlong JvmtiTagMap::get_tag(jobject object) { | |
849 MutexLocker ml(lock()); | |
850 | |
851 // resolve the object | |
852 oop o = JNIHandles::resolve_non_null(object); | |
853 | |
854 // for Classes get the tag from the klassOop | |
855 return tag_for(this, klassOop_if_java_lang_Class(o)); | |
856 } | |
857 | |
858 | |
859 // Helper class used to describe the static or instance fields of a class. | |
860 // For each field it holds the field index (as defined by the JVMTI specification), | |
861 // the field type, and the offset. | |
862 | |
863 class ClassFieldDescriptor: public CHeapObj { | |
864 private: | |
865 int _field_index; | |
866 int _field_offset; | |
867 char _field_type; | |
868 public: | |
869 ClassFieldDescriptor(int index, char type, int offset) : | |
870 _field_index(index), _field_type(type), _field_offset(offset) { | |
871 } | |
872 int field_index() const { return _field_index; } | |
873 char field_type() const { return _field_type; } | |
874 int field_offset() const { return _field_offset; } | |
875 }; | |
876 | |
877 class ClassFieldMap: public CHeapObj { | |
878 private: | |
879 enum { | |
880 initial_field_count = 5 | |
881 }; | |
882 | |
883 // list of field descriptors | |
884 GrowableArray<ClassFieldDescriptor*>* _fields; | |
885 | |
886 // constructor | |
887 ClassFieldMap(); | |
888 | |
889 // add a field | |
890 void add(int index, char type, int offset); | |
891 | |
892 // returns the field count for the given class | |
893 static int compute_field_count(instanceKlassHandle ikh); | |
894 | |
895 public: | |
896 ~ClassFieldMap(); | |
897 | |
898 // access | |
899 int field_count() { return _fields->length(); } | |
900 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
901 | |
902 // functions to create maps of static or instance fields | |
903 static ClassFieldMap* create_map_of_static_fields(klassOop k); | |
904 static ClassFieldMap* create_map_of_instance_fields(oop obj); | |
905 }; | |
906 | |
907 ClassFieldMap::ClassFieldMap() { | |
908 _fields = new (ResourceObj::C_HEAP) GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
909 } | |
910 | |
911 ClassFieldMap::~ClassFieldMap() { | |
912 for (int i=0; i<_fields->length(); i++) { | |
913 delete _fields->at(i); | |
914 } | |
915 delete _fields; | |
916 } | |
917 | |
918 void ClassFieldMap::add(int index, char type, int offset) { | |
919 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
920 _fields->append(field); | |
921 } | |
922 | |
923 // Returns a heap allocated ClassFieldMap to describe the static fields | |
924 // of the given class. | |
925 // | |
926 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(klassOop k) { | |
927 HandleMark hm; | |
928 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
929 | |
930 // create the field map | |
931 ClassFieldMap* field_map = new ClassFieldMap(); | |
932 | |
933 FilteredFieldStream f(ikh, false, false); | |
934 int max_field_index = f.field_count()-1; | |
935 | |
936 int index = 0; | |
937 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
938 // ignore instance fields | |
939 if (!fld.access_flags().is_static()) { | |
940 continue; | |
941 } | |
942 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
943 } | |
944 return field_map; | |
945 } | |
946 | |
947 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
948 // of the given class. All instance fields are included (this means public | |
949 // and private fields declared in superclasses and superinterfaces too). | |
950 // | |
951 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
952 HandleMark hm; | |
953 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
954 | |
955 // create the field map | |
956 ClassFieldMap* field_map = new ClassFieldMap(); | |
957 | |
958 FilteredFieldStream f(ikh, false, false); | |
959 | |
960 int max_field_index = f.field_count()-1; | |
961 | |
962 int index = 0; | |
963 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
964 // ignore static fields | |
965 if (fld.access_flags().is_static()) { | |
966 continue; | |
967 } | |
968 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
969 } | |
970 | |
971 return field_map; | |
972 } | |
973 | |
974 // Helper class used to cache a ClassFileMap for the instance fields of | |
975 // a cache. A JvmtiCachedClassFieldMap can be cached by an instanceKlass during | |
976 // heap iteration and avoid creating a field map for each object in the heap | |
977 // (only need to create the map when the first instance of a class is encountered). | |
978 // | |
979 class JvmtiCachedClassFieldMap : public CHeapObj { | |
980 private: | |
981 enum { | |
982 initial_class_count = 200 | |
983 }; | |
984 ClassFieldMap* _field_map; | |
985 | |
986 ClassFieldMap* field_map() const { return _field_map; } | |
987 | |
988 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
989 ~JvmtiCachedClassFieldMap(); | |
990 | |
991 static GrowableArray<instanceKlass*>* _class_list; | |
992 static void add_to_class_list(instanceKlass* ik); | |
993 | |
994 public: | |
995 // returns the field map for a given object (returning map cached | |
996 // by instanceKlass if possible | |
997 static ClassFieldMap* get_map_of_instance_fields(oop obj); | |
998 | |
999 // removes the field map from all instanceKlasses - should be | |
1000 // called before VM operation completes | |
1001 static void clear_cache(); | |
1002 | |
1003 // returns the number of ClassFieldMap cached by instanceKlasses | |
1004 static int cached_field_map_count(); | |
1005 }; | |
1006 | |
1007 GrowableArray<instanceKlass*>* JvmtiCachedClassFieldMap::_class_list; | |
1008 | |
1009 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
1010 _field_map = field_map; | |
1011 } | |
1012 | |
1013 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
1014 if (_field_map != NULL) { | |
1015 delete _field_map; | |
1016 } | |
1017 } | |
1018 | |
1019 // Marker class to ensure that the class file map cache is only used in a defined | |
1020 // scope. | |
1021 class ClassFieldMapCacheMark : public StackObj { | |
1022 private: | |
1023 static bool _is_active; | |
1024 public: | |
1025 ClassFieldMapCacheMark() { | |
1026 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
1027 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
1028 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
1029 _is_active = true; | |
1030 } | |
1031 ~ClassFieldMapCacheMark() { | |
1032 JvmtiCachedClassFieldMap::clear_cache(); | |
1033 _is_active = false; | |
1034 } | |
1035 static bool is_active() { return _is_active; } | |
1036 }; | |
1037 | |
1038 bool ClassFieldMapCacheMark::_is_active; | |
1039 | |
1040 | |
1041 // record that the given instanceKlass is caching a field map | |
1042 void JvmtiCachedClassFieldMap::add_to_class_list(instanceKlass* ik) { | |
1043 if (_class_list == NULL) { | |
1044 _class_list = new (ResourceObj::C_HEAP) GrowableArray<instanceKlass*>(initial_class_count, true); | |
1045 } | |
1046 _class_list->push(ik); | |
1047 } | |
1048 | |
1049 // returns the instance field map for the given object | |
1050 // (returns field map cached by the instanceKlass if possible) | |
1051 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { | |
1052 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
1053 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
1054 | |
1055 klassOop k = obj->klass(); | |
1056 instanceKlass* ik = instanceKlass::cast(k); | |
1057 | |
1058 // return cached map if possible | |
1059 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
1060 if (cached_map != NULL) { | |
1061 assert(cached_map->field_map() != NULL, "missing field list"); | |
1062 return cached_map->field_map(); | |
1063 } else { | |
1064 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
1065 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
1066 ik->set_jvmti_cached_class_field_map(cached_map); | |
1067 add_to_class_list(ik); | |
1068 return field_map; | |
1069 } | |
1070 } | |
1071 | |
1072 // remove the fields maps cached from all instanceKlasses | |
1073 void JvmtiCachedClassFieldMap::clear_cache() { | |
1074 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
1075 if (_class_list != NULL) { | |
1076 for (int i = 0; i < _class_list->length(); i++) { | |
1077 instanceKlass* ik = _class_list->at(i); | |
1078 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
1079 assert(cached_map != NULL, "should not be NULL"); | |
1080 ik->set_jvmti_cached_class_field_map(NULL); | |
1081 delete cached_map; // deletes the encapsulated field map | |
1082 } | |
1083 delete _class_list; | |
1084 _class_list = NULL; | |
1085 } | |
1086 } | |
1087 | |
1088 // returns the number of ClassFieldMap cached by instanceKlasses | |
1089 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
1090 return (_class_list == NULL) ? 0 : _class_list->length(); | |
1091 } | |
1092 | |
1093 // helper function to indicate if an object is filtered by its tag or class tag | |
1094 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
1095 jlong klass_tag, | |
1096 int heap_filter) { | |
1097 // apply the heap filter | |
1098 if (obj_tag != 0) { | |
1099 // filter out tagged objects | |
1100 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
1101 } else { | |
1102 // filter out untagged objects | |
1103 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
1104 } | |
1105 if (klass_tag != 0) { | |
1106 // filter out objects with tagged classes | |
1107 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
1108 } else { | |
1109 // filter out objects with untagged classes. | |
1110 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
1111 } | |
1112 return false; | |
1113 } | |
1114 | |
1115 // helper function to indicate if an object is filtered by a klass filter | |
1116 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
1117 if (!klass_filter.is_null()) { | |
1118 if (obj->klass() != klass_filter()) { | |
1119 return true; | |
1120 } | |
1121 } | |
1122 return false; | |
1123 } | |
1124 | |
1125 // helper function to tell if a field is a primitive field or not | |
1126 static inline bool is_primitive_field_type(char type) { | |
1127 return (type != 'L' && type != '['); | |
1128 } | |
1129 | |
1130 // helper function to copy the value from location addr to jvalue. | |
1131 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
1132 switch (value_type) { | |
1133 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
1134 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
1135 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
1136 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
1137 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
1138 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
1139 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
1140 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
1141 default: ShouldNotReachHere(); | |
1142 } | |
1143 } | |
1144 | |
1145 // helper function to invoke string primitive value callback | |
1146 // returns visit control flags | |
1147 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
1148 CallbackWrapper* wrapper, | |
1149 oop str, | |
1150 void* user_data) | |
1151 { | |
1142 | 1152 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 1153 |
1154 // get the string value and length | |
1155 // (string value may be offset from the base) | |
1156 int s_len = java_lang_String::length(str); | |
1157 typeArrayOop s_value = java_lang_String::value(str); | |
1158 int s_offset = java_lang_String::offset(str); | |
1159 jchar* value; | |
1160 if (s_len > 0) { | |
1161 value = s_value->char_at_addr(s_offset); | |
1162 } else { | |
1163 value = (jchar*) s_value->base(T_CHAR); | |
1164 } | |
1165 | |
1166 // invoke the callback | |
1167 return (*cb)(wrapper->klass_tag(), | |
1168 wrapper->obj_size(), | |
1169 wrapper->obj_tag_p(), | |
1170 value, | |
1171 (jint)s_len, | |
1172 user_data); | |
1173 } | |
1174 | |
1175 // helper function to invoke string primitive value callback | |
1176 // returns visit control flags | |
1177 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
1178 CallbackWrapper* wrapper, | |
1179 oop obj, | |
1180 void* user_data) | |
1181 { | |
1182 assert(obj->is_typeArray(), "not a primitive array"); | |
1183 | |
1184 // get base address of first element | |
1185 typeArrayOop array = typeArrayOop(obj); | |
1186 BasicType type = typeArrayKlass::cast(array->klass())->element_type(); | |
1187 void* elements = array->base(type); | |
1188 | |
1189 // jvmtiPrimitiveType is defined so this mapping is always correct | |
1190 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
1191 | |
1192 return (*cb)(wrapper->klass_tag(), | |
1193 wrapper->obj_size(), | |
1194 wrapper->obj_tag_p(), | |
1195 (jint)array->length(), | |
1196 elem_type, | |
1197 elements, | |
1198 user_data); | |
1199 } | |
1200 | |
1201 // helper function to invoke the primitive field callback for all static fields | |
1202 // of a given class | |
1203 static jint invoke_primitive_field_callback_for_static_fields | |
1204 (CallbackWrapper* wrapper, | |
1205 oop obj, | |
1206 jvmtiPrimitiveFieldCallback cb, | |
1207 void* user_data) | |
1208 { | |
1209 // for static fields only the index will be set | |
1210 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1211 | |
1142 | 1212 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
0 | 1213 if (java_lang_Class::is_primitive(obj)) { |
1214 return 0; | |
1215 } | |
1216 klassOop k = java_lang_Class::as_klassOop(obj); | |
1217 Klass* klass = k->klass_part(); | |
1218 | |
1219 // ignore classes for object and type arrays | |
1220 if (!klass->oop_is_instance()) { | |
1221 return 0; | |
1222 } | |
1223 | |
1224 // ignore classes which aren't linked yet | |
1225 instanceKlass* ik = instanceKlass::cast(k); | |
1226 if (!ik->is_linked()) { | |
1227 return 0; | |
1228 } | |
1229 | |
1230 // get the field map | |
1231 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
1232 | |
1233 // invoke the callback for each static primitive field | |
1234 for (int i=0; i<field_map->field_count(); i++) { | |
1235 ClassFieldDescriptor* field = field_map->field_at(i); | |
1236 | |
1237 // ignore non-primitive fields | |
1238 char type = field->field_type(); | |
1239 if (!is_primitive_field_type(type)) { | |
1240 continue; | |
1241 } | |
1242 // one-to-one mapping | |
1243 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1244 | |
1245 // get offset and field value | |
1246 int offset = field->field_offset(); | |
1247 address addr = (address)k + offset; | |
1248 jvalue value; | |
1249 copy_to_jvalue(&value, addr, value_type); | |
1250 | |
1251 // field index | |
1252 reference_info.field.index = field->field_index(); | |
1253 | |
1254 // invoke the callback | |
1255 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
1256 &reference_info, | |
1257 wrapper->klass_tag(), | |
1258 wrapper->obj_tag_p(), | |
1259 value, | |
1260 value_type, | |
1261 user_data); | |
1262 if (res & JVMTI_VISIT_ABORT) { | |
1263 delete field_map; | |
1264 return res; | |
1265 } | |
1266 } | |
1267 | |
1268 delete field_map; | |
1269 return 0; | |
1270 } | |
1271 | |
1272 // helper function to invoke the primitive field callback for all instance fields | |
1273 // of a given object | |
1274 static jint invoke_primitive_field_callback_for_instance_fields( | |
1275 CallbackWrapper* wrapper, | |
1276 oop obj, | |
1277 jvmtiPrimitiveFieldCallback cb, | |
1278 void* user_data) | |
1279 { | |
1280 // for instance fields only the index will be set | |
1281 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1282 | |
1283 // get the map of the instance fields | |
1284 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
1285 | |
1286 // invoke the callback for each instance primitive field | |
1287 for (int i=0; i<fields->field_count(); i++) { | |
1288 ClassFieldDescriptor* field = fields->field_at(i); | |
1289 | |
1290 // ignore non-primitive fields | |
1291 char type = field->field_type(); | |
1292 if (!is_primitive_field_type(type)) { | |
1293 continue; | |
1294 } | |
1295 // one-to-one mapping | |
1296 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1297 | |
1298 // get offset and field value | |
1299 int offset = field->field_offset(); | |
1300 address addr = (address)obj + offset; | |
1301 jvalue value; | |
1302 copy_to_jvalue(&value, addr, value_type); | |
1303 | |
1304 // field index | |
1305 reference_info.field.index = field->field_index(); | |
1306 | |
1307 // invoke the callback | |
1308 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
1309 &reference_info, | |
1310 wrapper->klass_tag(), | |
1311 wrapper->obj_tag_p(), | |
1312 value, | |
1313 value_type, | |
1314 user_data); | |
1315 if (res & JVMTI_VISIT_ABORT) { | |
1316 return res; | |
1317 } | |
1318 } | |
1319 return 0; | |
1320 } | |
1321 | |
1322 | |
1323 // VM operation to iterate over all objects in the heap (both reachable | |
1324 // and unreachable) | |
1325 class VM_HeapIterateOperation: public VM_Operation { | |
1326 private: | |
1327 ObjectClosure* _blk; | |
1328 public: | |
1329 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
1330 | |
1331 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
1332 void doit() { | |
1333 // allows class files maps to be cached during iteration | |
1334 ClassFieldMapCacheMark cm; | |
1335 | |
1336 // make sure that heap is parsable (fills TLABs with filler objects) | |
1337 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1338 | |
1339 // Verify heap before iteration - if the heap gets corrupted then | |
1340 // JVMTI's IterateOverHeap will crash. | |
1341 if (VerifyBeforeIteration) { | |
1342 Universe::verify(); | |
1343 } | |
1344 | |
1345 // do the iteration | |
517
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1346 // If this operation encounters a bad object when using CMS, |
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1347 // consider using safe_object_iterate() which avoids perm gen |
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1348 // objects that may contain bad references. |
0 | 1349 Universe::heap()->object_iterate(_blk); |
1350 | |
1351 // when sharing is enabled we must iterate over the shared spaces | |
1352 if (UseSharedSpaces) { | |
1353 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1354 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
1355 gen->ro_space()->object_iterate(_blk); | |
1356 gen->rw_space()->object_iterate(_blk); | |
1357 } | |
1358 } | |
1359 | |
1360 }; | |
1361 | |
1362 | |
1363 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
1364 // IterateOverInstancesOfClass functions | |
1365 class IterateOverHeapObjectClosure: public ObjectClosure { | |
1366 private: | |
1367 JvmtiTagMap* _tag_map; | |
1368 KlassHandle _klass; | |
1369 jvmtiHeapObjectFilter _object_filter; | |
1370 jvmtiHeapObjectCallback _heap_object_callback; | |
1371 const void* _user_data; | |
1372 | |
1373 // accessors | |
1374 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1375 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
1376 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
1377 KlassHandle klass() const { return _klass; } | |
1378 const void* user_data() const { return _user_data; } | |
1379 | |
1380 // indicates if iteration has been aborted | |
1381 bool _iteration_aborted; | |
1382 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1383 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
1384 | |
1385 public: | |
1386 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
1387 KlassHandle klass, | |
1388 jvmtiHeapObjectFilter object_filter, | |
1389 jvmtiHeapObjectCallback heap_object_callback, | |
1390 const void* user_data) : | |
1391 _tag_map(tag_map), | |
1392 _klass(klass), | |
1393 _object_filter(object_filter), | |
1394 _heap_object_callback(heap_object_callback), | |
1395 _user_data(user_data), | |
1396 _iteration_aborted(false) | |
1397 { | |
1398 } | |
1399 | |
1400 void do_object(oop o); | |
1401 }; | |
1402 | |
1403 // invoked for each object in the heap | |
1404 void IterateOverHeapObjectClosure::do_object(oop o) { | |
1405 // check if iteration has been halted | |
1406 if (is_iteration_aborted()) return; | |
1407 | |
1408 // ignore any objects that aren't visible to profiler | |
1409 if (!ServiceUtil::visible_oop(o)) return; | |
1410 | |
1411 // instanceof check when filtering by klass | |
1412 if (!klass().is_null() && !o->is_a(klass()())) { | |
1413 return; | |
1414 } | |
1415 // prepare for the calllback | |
1416 CallbackWrapper wrapper(tag_map(), o); | |
1417 | |
1418 // if the object is tagged and we're only interested in untagged objects | |
1419 // then don't invoke the callback. Similiarly, if the object is untagged | |
1420 // and we're only interested in tagged objects we skip the callback. | |
1421 if (wrapper.obj_tag() != 0) { | |
1422 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
1423 } else { | |
1424 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
1425 } | |
1426 | |
1427 // invoke the agent's callback | |
1428 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
1429 wrapper.obj_size(), | |
1430 wrapper.obj_tag_p(), | |
1431 (void*)user_data()); | |
1432 if (control == JVMTI_ITERATION_ABORT) { | |
1433 set_iteration_aborted(true); | |
1434 } | |
1435 } | |
1436 | |
1437 // An ObjectClosure used to support the IterateThroughHeap function | |
1438 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
1439 private: | |
1440 JvmtiTagMap* _tag_map; | |
1441 KlassHandle _klass; | |
1442 int _heap_filter; | |
1443 const jvmtiHeapCallbacks* _callbacks; | |
1444 const void* _user_data; | |
1445 | |
1446 // accessor functions | |
1447 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1448 int heap_filter() const { return _heap_filter; } | |
1449 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
1450 KlassHandle klass() const { return _klass; } | |
1451 const void* user_data() const { return _user_data; } | |
1452 | |
1453 // indicates if the iteration has been aborted | |
1454 bool _iteration_aborted; | |
1455 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1456 | |
1457 // used to check the visit control flags. If the abort flag is set | |
1458 // then we set the iteration aborted flag so that the iteration completes | |
1459 // without processing any further objects | |
1460 bool check_flags_for_abort(jint flags) { | |
1461 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
1462 if (is_abort) { | |
1463 _iteration_aborted = true; | |
1464 } | |
1465 return is_abort; | |
1466 } | |
1467 | |
1468 public: | |
1469 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
1470 KlassHandle klass, | |
1471 int heap_filter, | |
1472 const jvmtiHeapCallbacks* heap_callbacks, | |
1473 const void* user_data) : | |
1474 _tag_map(tag_map), | |
1475 _klass(klass), | |
1476 _heap_filter(heap_filter), | |
1477 _callbacks(heap_callbacks), | |
1478 _user_data(user_data), | |
1479 _iteration_aborted(false) | |
1480 { | |
1481 } | |
1482 | |
1483 void do_object(oop o); | |
1484 }; | |
1485 | |
1486 // invoked for each object in the heap | |
1487 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
1488 // check if iteration has been halted | |
1489 if (is_iteration_aborted()) return; | |
1490 | |
1491 // ignore any objects that aren't visible to profiler | |
1492 if (!ServiceUtil::visible_oop(obj)) return; | |
1493 | |
1494 // apply class filter | |
1495 if (is_filtered_by_klass_filter(obj, klass())) return; | |
1496 | |
1497 // prepare for callback | |
1498 CallbackWrapper wrapper(tag_map(), obj); | |
1499 | |
1500 // check if filtered by the heap filter | |
1501 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
1502 return; | |
1503 } | |
1504 | |
1505 // for arrays we need the length, otherwise -1 | |
1506 bool is_array = obj->is_array(); | |
1507 int len = is_array ? arrayOop(obj)->length() : -1; | |
1508 | |
1509 // invoke the object callback (if callback is provided) | |
1510 if (callbacks()->heap_iteration_callback != NULL) { | |
1511 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
1512 jint res = (*cb)(wrapper.klass_tag(), | |
1513 wrapper.obj_size(), | |
1514 wrapper.obj_tag_p(), | |
1515 (jint)len, | |
1516 (void*)user_data()); | |
1517 if (check_flags_for_abort(res)) return; | |
1518 } | |
1519 | |
1520 // for objects and classes we report primitive fields if callback provided | |
1521 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
1522 jint res; | |
1523 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
1142 | 1524 if (obj->klass() == SystemDictionary::Class_klass()) { |
0 | 1525 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
1526 obj, | |
1527 cb, | |
1528 (void*)user_data()); | |
1529 } else { | |
1530 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
1531 obj, | |
1532 cb, | |
1533 (void*)user_data()); | |
1534 } | |
1535 if (check_flags_for_abort(res)) return; | |
1536 } | |
1537 | |
1538 // string callback | |
1539 if (!is_array && | |
1540 callbacks()->string_primitive_value_callback != NULL && | |
1142 | 1541 obj->klass() == SystemDictionary::String_klass()) { |
0 | 1542 jint res = invoke_string_value_callback( |
1543 callbacks()->string_primitive_value_callback, | |
1544 &wrapper, | |
1545 obj, | |
1546 (void*)user_data() ); | |
1547 if (check_flags_for_abort(res)) return; | |
1548 } | |
1549 | |
1550 // array callback | |
1551 if (is_array && | |
1552 callbacks()->array_primitive_value_callback != NULL && | |
1553 obj->is_typeArray()) { | |
1554 jint res = invoke_array_primitive_value_callback( | |
1555 callbacks()->array_primitive_value_callback, | |
1556 &wrapper, | |
1557 obj, | |
1558 (void*)user_data() ); | |
1559 if (check_flags_for_abort(res)) return; | |
1560 } | |
1561 }; | |
1562 | |
1563 | |
1564 // Deprecated function to iterate over all objects in the heap | |
1565 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
1566 KlassHandle klass, | |
1567 jvmtiHeapObjectCallback heap_object_callback, | |
1568 const void* user_data) | |
1569 { | |
1570 MutexLocker ml(Heap_lock); | |
1571 IterateOverHeapObjectClosure blk(this, | |
1572 klass, | |
1573 object_filter, | |
1574 heap_object_callback, | |
1575 user_data); | |
1576 VM_HeapIterateOperation op(&blk); | |
1577 VMThread::execute(&op); | |
1578 } | |
1579 | |
1580 | |
1581 // Iterates over all objects in the heap | |
1582 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
1583 KlassHandle klass, | |
1584 const jvmtiHeapCallbacks* callbacks, | |
1585 const void* user_data) | |
1586 { | |
1587 MutexLocker ml(Heap_lock); | |
1588 IterateThroughHeapObjectClosure blk(this, | |
1589 klass, | |
1590 heap_filter, | |
1591 callbacks, | |
1592 user_data); | |
1593 VM_HeapIterateOperation op(&blk); | |
1594 VMThread::execute(&op); | |
1595 } | |
1596 | |
1597 // support class for get_objects_with_tags | |
1598 | |
1599 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
1600 private: | |
1601 JvmtiEnv* _env; | |
1602 jlong* _tags; | |
1603 jint _tag_count; | |
1604 | |
1605 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
1606 GrowableArray<uint64_t>* _tag_results; // collected tags | |
1607 | |
1608 public: | |
1609 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
1610 _env = env; | |
1611 _tags = (jlong*)tags; | |
1612 _tag_count = tag_count; | |
1613 _object_results = new (ResourceObj::C_HEAP) GrowableArray<jobject>(1,true); | |
1614 _tag_results = new (ResourceObj::C_HEAP) GrowableArray<uint64_t>(1,true); | |
1615 } | |
1616 | |
1617 ~TagObjectCollector() { | |
1618 delete _object_results; | |
1619 delete _tag_results; | |
1620 } | |
1621 | |
1622 // for each tagged object check if the tag value matches | |
1623 // - if it matches then we create a JNI local reference to the object | |
1624 // and record the reference and tag value. | |
1625 // | |
1626 void do_entry(JvmtiTagHashmapEntry* entry) { | |
1627 for (int i=0; i<_tag_count; i++) { | |
1628 if (_tags[i] == entry->tag()) { | |
1629 oop o = JNIHandles::resolve(entry->object()); | |
1630 assert(o != NULL && o != JNIHandles::deleted_handle(), "sanity check"); | |
1631 | |
1632 // the mirror is tagged | |
1633 if (o->is_klass()) { | |
1634 klassOop k = (klassOop)o; | |
1635 o = Klass::cast(k)->java_mirror(); | |
1636 } | |
1637 | |
1638 jobject ref = JNIHandles::make_local(JavaThread::current(), o); | |
1639 _object_results->append(ref); | |
1640 _tag_results->append((uint64_t)entry->tag()); | |
1641 } | |
1642 } | |
1643 } | |
1644 | |
1645 // return the results from the collection | |
1646 // | |
1647 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1648 jvmtiError error; | |
1649 int count = _object_results->length(); | |
1650 assert(count >= 0, "sanity check"); | |
1651 | |
1652 // if object_result_ptr is not NULL then allocate the result and copy | |
1653 // in the object references. | |
1654 if (object_result_ptr != NULL) { | |
1655 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
1656 if (error != JVMTI_ERROR_NONE) { | |
1657 return error; | |
1658 } | |
1659 for (int i=0; i<count; i++) { | |
1660 (*object_result_ptr)[i] = _object_results->at(i); | |
1661 } | |
1662 } | |
1663 | |
1664 // if tag_result_ptr is not NULL then allocate the result and copy | |
1665 // in the tag values. | |
1666 if (tag_result_ptr != NULL) { | |
1667 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
1668 if (error != JVMTI_ERROR_NONE) { | |
1669 if (object_result_ptr != NULL) { | |
1670 _env->Deallocate((unsigned char*)object_result_ptr); | |
1671 } | |
1672 return error; | |
1673 } | |
1674 for (int i=0; i<count; i++) { | |
1675 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
1676 } | |
1677 } | |
1678 | |
1679 *count_ptr = count; | |
1680 return JVMTI_ERROR_NONE; | |
1681 } | |
1682 }; | |
1683 | |
1684 // return the list of objects with the specified tags | |
1685 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
1686 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1687 | |
1688 TagObjectCollector collector(env(), tags, count); | |
1689 { | |
1690 // iterate over all tagged objects | |
1691 MutexLocker ml(lock()); | |
1692 entry_iterate(&collector); | |
1693 } | |
1694 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
1695 } | |
1696 | |
1697 | |
1698 // ObjectMarker is used to support the marking objects when walking the | |
1699 // heap. | |
1700 // | |
1701 // This implementation uses the existing mark bits in an object for | |
1702 // marking. Objects that are marked must later have their headers restored. | |
1703 // As most objects are unlocked and don't have their identity hash computed | |
1704 // we don't have to save their headers. Instead we save the headers that | |
1705 // are "interesting". Later when the headers are restored this implementation | |
1706 // restores all headers to their initial value and then restores the few | |
1707 // objects that had interesting headers. | |
1708 // | |
1709 // Future work: This implementation currently uses growable arrays to save | |
1710 // the oop and header of interesting objects. As an optimization we could | |
1711 // use the same technique as the GC and make use of the unused area | |
1712 // between top() and end(). | |
1713 // | |
1714 | |
1715 // An ObjectClosure used to restore the mark bits of an object | |
1716 class RestoreMarksClosure : public ObjectClosure { | |
1717 public: | |
1718 void do_object(oop o) { | |
1719 if (o != NULL) { | |
1720 markOop mark = o->mark(); | |
1721 if (mark->is_marked()) { | |
1722 o->init_mark(); | |
1723 } | |
1724 } | |
1725 } | |
1726 }; | |
1727 | |
1728 // ObjectMarker provides the mark and visited functions | |
1729 class ObjectMarker : AllStatic { | |
1730 private: | |
1731 // saved headers | |
1732 static GrowableArray<oop>* _saved_oop_stack; | |
1733 static GrowableArray<markOop>* _saved_mark_stack; | |
1734 | |
1735 public: | |
1736 static void init(); // initialize | |
1737 static void done(); // clean-up | |
1738 | |
1739 static inline void mark(oop o); // mark an object | |
1740 static inline bool visited(oop o); // check if object has been visited | |
1741 }; | |
1742 | |
1743 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
1744 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
1745 | |
1746 // initialize ObjectMarker - prepares for object marking | |
1747 void ObjectMarker::init() { | |
1748 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
1749 | |
1750 // prepare heap for iteration | |
1751 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1752 | |
1753 // create stacks for interesting headers | |
1754 _saved_mark_stack = new (ResourceObj::C_HEAP) GrowableArray<markOop>(4000, true); | |
1755 _saved_oop_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(4000, true); | |
1756 | |
1757 if (UseBiasedLocking) { | |
1758 BiasedLocking::preserve_marks(); | |
1759 } | |
1760 } | |
1761 | |
1762 // Object marking is done so restore object headers | |
1763 void ObjectMarker::done() { | |
1764 // iterate over all objects and restore the mark bits to | |
1765 // their initial value | |
1766 RestoreMarksClosure blk; | |
1767 Universe::heap()->object_iterate(&blk); | |
1768 | |
1769 // When sharing is enabled we need to restore the headers of the objects | |
1770 // in the readwrite space too. | |
1771 if (UseSharedSpaces) { | |
1772 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1773 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
1774 gen->rw_space()->object_iterate(&blk); | |
1775 } | |
1776 | |
1777 // now restore the interesting headers | |
1778 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
1779 oop o = _saved_oop_stack->at(i); | |
1780 markOop mark = _saved_mark_stack->at(i); | |
1781 o->set_mark(mark); | |
1782 } | |
1783 | |
1784 if (UseBiasedLocking) { | |
1785 BiasedLocking::restore_marks(); | |
1786 } | |
1787 | |
1788 // free the stacks | |
1789 delete _saved_oop_stack; | |
1790 delete _saved_mark_stack; | |
1791 } | |
1792 | |
1793 // mark an object | |
1794 inline void ObjectMarker::mark(oop o) { | |
1795 assert(Universe::heap()->is_in(o), "sanity check"); | |
1796 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
1797 | |
1798 // object's mark word | |
1799 markOop mark = o->mark(); | |
1800 | |
1801 if (mark->must_be_preserved(o)) { | |
1802 _saved_mark_stack->push(mark); | |
1803 _saved_oop_stack->push(o); | |
1804 } | |
1805 | |
1806 // mark the object | |
1807 o->set_mark(markOopDesc::prototype()->set_marked()); | |
1808 } | |
1809 | |
1810 // return true if object is marked | |
1811 inline bool ObjectMarker::visited(oop o) { | |
1812 return o->mark()->is_marked(); | |
1813 } | |
1814 | |
1815 // Stack allocated class to help ensure that ObjectMarker is used | |
1816 // correctly. Constructor initializes ObjectMarker, destructor calls | |
1817 // ObjectMarker's done() function to restore object headers. | |
1818 class ObjectMarkerController : public StackObj { | |
1819 public: | |
1820 ObjectMarkerController() { | |
1821 ObjectMarker::init(); | |
1822 } | |
1823 ~ObjectMarkerController() { | |
1824 ObjectMarker::done(); | |
1825 } | |
1826 }; | |
1827 | |
1828 | |
1829 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
1830 // (not performance critical as only used for roots) | |
1831 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
1832 switch (kind) { | |
1833 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
1834 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
1835 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
1836 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
1837 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
1838 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
1839 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
1840 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
1841 } | |
1842 } | |
1843 | |
1844 // Base class for all heap walk contexts. The base class maintains a flag | |
1845 // to indicate if the context is valid or not. | |
1846 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
1847 private: | |
1848 bool _valid; | |
1849 public: | |
1850 HeapWalkContext(bool valid) { _valid = valid; } | |
1851 void invalidate() { _valid = false; } | |
1852 bool is_valid() const { return _valid; } | |
1853 }; | |
1854 | |
1855 // A basic heap walk context for the deprecated heap walking functions. | |
1856 // The context for a basic heap walk are the callbacks and fields used by | |
1857 // the referrer caching scheme. | |
1858 class BasicHeapWalkContext: public HeapWalkContext { | |
1859 private: | |
1860 jvmtiHeapRootCallback _heap_root_callback; | |
1861 jvmtiStackReferenceCallback _stack_ref_callback; | |
1862 jvmtiObjectReferenceCallback _object_ref_callback; | |
1863 | |
1864 // used for caching | |
1865 oop _last_referrer; | |
1866 jlong _last_referrer_tag; | |
1867 | |
1868 public: | |
1869 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
1870 | |
1871 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
1872 jvmtiStackReferenceCallback stack_ref_callback, | |
1873 jvmtiObjectReferenceCallback object_ref_callback) : | |
1874 HeapWalkContext(true), | |
1875 _heap_root_callback(heap_root_callback), | |
1876 _stack_ref_callback(stack_ref_callback), | |
1877 _object_ref_callback(object_ref_callback), | |
1878 _last_referrer(NULL), | |
1879 _last_referrer_tag(0) { | |
1880 } | |
1881 | |
1882 // accessors | |
1883 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
1884 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
1885 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
1886 | |
1887 oop last_referrer() const { return _last_referrer; } | |
1888 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
1889 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
1890 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
1891 }; | |
1892 | |
1893 // The advanced heap walk context for the FollowReferences functions. | |
1894 // The context is the callbacks, and the fields used for filtering. | |
1895 class AdvancedHeapWalkContext: public HeapWalkContext { | |
1896 private: | |
1897 jint _heap_filter; | |
1898 KlassHandle _klass_filter; | |
1899 const jvmtiHeapCallbacks* _heap_callbacks; | |
1900 | |
1901 public: | |
1902 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
1903 | |
1904 AdvancedHeapWalkContext(jint heap_filter, | |
1905 KlassHandle klass_filter, | |
1906 const jvmtiHeapCallbacks* heap_callbacks) : | |
1907 HeapWalkContext(true), | |
1908 _heap_filter(heap_filter), | |
1909 _klass_filter(klass_filter), | |
1910 _heap_callbacks(heap_callbacks) { | |
1911 } | |
1912 | |
1913 // accessors | |
1914 jint heap_filter() const { return _heap_filter; } | |
1915 KlassHandle klass_filter() const { return _klass_filter; } | |
1916 | |
1917 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
1918 return _heap_callbacks->heap_reference_callback; | |
1919 }; | |
1920 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
1921 return _heap_callbacks->primitive_field_callback; | |
1922 } | |
1923 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
1924 return _heap_callbacks->array_primitive_value_callback; | |
1925 } | |
1926 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
1927 return _heap_callbacks->string_primitive_value_callback; | |
1928 } | |
1929 }; | |
1930 | |
1931 // The CallbackInvoker is a class with static functions that the heap walk can call | |
1932 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
1933 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
1934 // mode is for the newer FollowReferences function which supports a lot of | |
1935 // additional callbacks. | |
1936 class CallbackInvoker : AllStatic { | |
1937 private: | |
1938 // heap walk styles | |
1939 enum { basic, advanced }; | |
1940 static int _heap_walk_type; | |
1941 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
1942 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
1943 | |
1944 // context for basic style heap walk | |
1945 static BasicHeapWalkContext _basic_context; | |
1946 static BasicHeapWalkContext* basic_context() { | |
1947 assert(_basic_context.is_valid(), "invalid"); | |
1948 return &_basic_context; | |
1949 } | |
1950 | |
1951 // context for advanced style heap walk | |
1952 static AdvancedHeapWalkContext _advanced_context; | |
1953 static AdvancedHeapWalkContext* advanced_context() { | |
1954 assert(_advanced_context.is_valid(), "invalid"); | |
1955 return &_advanced_context; | |
1956 } | |
1957 | |
1958 // context needed for all heap walks | |
1959 static JvmtiTagMap* _tag_map; | |
1960 static const void* _user_data; | |
1961 static GrowableArray<oop>* _visit_stack; | |
1962 | |
1963 // accessors | |
1964 static JvmtiTagMap* tag_map() { return _tag_map; } | |
1965 static const void* user_data() { return _user_data; } | |
1966 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
1967 | |
1968 // if the object hasn't been visited then push it onto the visit stack | |
1969 // so that it will be visited later | |
1970 static inline bool check_for_visit(oop obj) { | |
1971 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
1972 return true; | |
1973 } | |
1974 | |
1975 // invoke basic style callbacks | |
1976 static inline bool invoke_basic_heap_root_callback | |
1977 (jvmtiHeapRootKind root_kind, oop obj); | |
1978 static inline bool invoke_basic_stack_ref_callback | |
1979 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
1980 int slot, oop obj); | |
1981 static inline bool invoke_basic_object_reference_callback | |
1982 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1983 | |
1984 // invoke advanced style callbacks | |
1985 static inline bool invoke_advanced_heap_root_callback | |
1986 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
1987 static inline bool invoke_advanced_stack_ref_callback | |
1988 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
1989 jmethodID method, jlocation bci, jint slot, oop obj); | |
1990 static inline bool invoke_advanced_object_reference_callback | |
1991 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1992 | |
1993 // used to report the value of primitive fields | |
1994 static inline bool report_primitive_field | |
1995 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
1996 | |
1997 public: | |
1998 // initialize for basic mode | |
1999 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
2000 GrowableArray<oop>* visit_stack, | |
2001 const void* user_data, | |
2002 BasicHeapWalkContext context); | |
2003 | |
2004 // initialize for advanced mode | |
2005 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
2006 GrowableArray<oop>* visit_stack, | |
2007 const void* user_data, | |
2008 AdvancedHeapWalkContext context); | |
2009 | |
2010 // functions to report roots | |
2011 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
2012 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
2013 jmethodID m, oop o); | |
2014 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
2015 jmethodID method, jlocation bci, jint slot, oop o); | |
2016 | |
2017 // functions to report references | |
2018 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
2019 static inline bool report_class_reference(oop referrer, oop referree); | |
2020 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
2021 static inline bool report_signers_reference(oop referrer, oop referree); | |
2022 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
2023 static inline bool report_superclass_reference(oop referrer, oop referree); | |
2024 static inline bool report_interface_reference(oop referrer, oop referree); | |
2025 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
2026 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
2027 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
2028 static inline bool report_primitive_array_values(oop array); | |
2029 static inline bool report_string_value(oop str); | |
2030 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
2031 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
2032 }; | |
2033 | |
2034 // statics | |
2035 int CallbackInvoker::_heap_walk_type; | |
2036 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
2037 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
2038 JvmtiTagMap* CallbackInvoker::_tag_map; | |
2039 const void* CallbackInvoker::_user_data; | |
2040 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
2041 | |
2042 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
2043 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
2044 GrowableArray<oop>* visit_stack, | |
2045 const void* user_data, | |
2046 BasicHeapWalkContext context) { | |
2047 _tag_map = tag_map; | |
2048 _visit_stack = visit_stack; | |
2049 _user_data = user_data; | |
2050 _basic_context = context; | |
2051 _advanced_context.invalidate(); // will trigger assertion if used | |
2052 _heap_walk_type = basic; | |
2053 } | |
2054 | |
2055 // initialize for advanced heap walk (FollowReferences) | |
2056 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
2057 GrowableArray<oop>* visit_stack, | |
2058 const void* user_data, | |
2059 AdvancedHeapWalkContext context) { | |
2060 _tag_map = tag_map; | |
2061 _visit_stack = visit_stack; | |
2062 _user_data = user_data; | |
2063 _advanced_context = context; | |
2064 _basic_context.invalidate(); // will trigger assertion if used | |
2065 _heap_walk_type = advanced; | |
2066 } | |
2067 | |
2068 | |
2069 // invoke basic style heap root callback | |
2070 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
2071 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2072 | |
2073 // if we heap roots should be reported | |
2074 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
2075 if (cb == NULL) { | |
2076 return check_for_visit(obj); | |
2077 } | |
2078 | |
2079 CallbackWrapper wrapper(tag_map(), obj); | |
2080 jvmtiIterationControl control = (*cb)(root_kind, | |
2081 wrapper.klass_tag(), | |
2082 wrapper.obj_size(), | |
2083 wrapper.obj_tag_p(), | |
2084 (void*)user_data()); | |
2085 // push root to visit stack when following references | |
2086 if (control == JVMTI_ITERATION_CONTINUE && | |
2087 basic_context()->object_ref_callback() != NULL) { | |
2088 visit_stack()->push(obj); | |
2089 } | |
2090 return control != JVMTI_ITERATION_ABORT; | |
2091 } | |
2092 | |
2093 // invoke basic style stack ref callback | |
2094 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
2095 jlong thread_tag, | |
2096 jint depth, | |
2097 jmethodID method, | |
2098 jint slot, | |
2099 oop obj) { | |
2100 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2101 | |
2102 // if we stack refs should be reported | |
2103 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
2104 if (cb == NULL) { | |
2105 return check_for_visit(obj); | |
2106 } | |
2107 | |
2108 CallbackWrapper wrapper(tag_map(), obj); | |
2109 jvmtiIterationControl control = (*cb)(root_kind, | |
2110 wrapper.klass_tag(), | |
2111 wrapper.obj_size(), | |
2112 wrapper.obj_tag_p(), | |
2113 thread_tag, | |
2114 depth, | |
2115 method, | |
2116 slot, | |
2117 (void*)user_data()); | |
2118 // push root to visit stack when following references | |
2119 if (control == JVMTI_ITERATION_CONTINUE && | |
2120 basic_context()->object_ref_callback() != NULL) { | |
2121 visit_stack()->push(obj); | |
2122 } | |
2123 return control != JVMTI_ITERATION_ABORT; | |
2124 } | |
2125 | |
2126 // invoke basic style object reference callback | |
2127 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
2128 oop referrer, | |
2129 oop referree, | |
2130 jint index) { | |
2131 | |
2132 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2133 assert(ServiceUtil::visible_oop(referree), "checking"); | |
2134 | |
2135 BasicHeapWalkContext* context = basic_context(); | |
2136 | |
2137 // callback requires the referrer's tag. If it's the same referrer | |
2138 // as the last call then we use the cached value. | |
2139 jlong referrer_tag; | |
2140 if (referrer == context->last_referrer()) { | |
2141 referrer_tag = context->last_referrer_tag(); | |
2142 } else { | |
2143 referrer_tag = tag_for(tag_map(), klassOop_if_java_lang_Class(referrer)); | |
2144 } | |
2145 | |
2146 // do the callback | |
2147 CallbackWrapper wrapper(tag_map(), referree); | |
2148 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
2149 jvmtiIterationControl control = (*cb)(ref_kind, | |
2150 wrapper.klass_tag(), | |
2151 wrapper.obj_size(), | |
2152 wrapper.obj_tag_p(), | |
2153 referrer_tag, | |
2154 index, | |
2155 (void*)user_data()); | |
2156 | |
2157 // record referrer and referrer tag. For self-references record the | |
2158 // tag value from the callback as this might differ from referrer_tag. | |
2159 context->set_last_referrer(referrer); | |
2160 if (referrer == referree) { | |
2161 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
2162 } else { | |
2163 context->set_last_referrer_tag(referrer_tag); | |
2164 } | |
2165 | |
2166 if (control == JVMTI_ITERATION_CONTINUE) { | |
2167 return check_for_visit(referree); | |
2168 } else { | |
2169 return control != JVMTI_ITERATION_ABORT; | |
2170 } | |
2171 } | |
2172 | |
2173 // invoke advanced style heap root callback | |
2174 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
2175 oop obj) { | |
2176 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2177 | |
2178 AdvancedHeapWalkContext* context = advanced_context(); | |
2179 | |
2180 // check that callback is provided | |
2181 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2182 if (cb == NULL) { | |
2183 return check_for_visit(obj); | |
2184 } | |
2185 | |
2186 // apply class filter | |
2187 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2188 return check_for_visit(obj); | |
2189 } | |
2190 | |
2191 // setup the callback wrapper | |
2192 CallbackWrapper wrapper(tag_map(), obj); | |
2193 | |
2194 // apply tag filter | |
2195 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2196 wrapper.klass_tag(), | |
2197 context->heap_filter())) { | |
2198 return check_for_visit(obj); | |
2199 } | |
2200 | |
2201 // for arrays we need the length, otherwise -1 | |
2202 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2203 | |
2204 // invoke the callback | |
2205 jint res = (*cb)(ref_kind, | |
2206 NULL, // referrer info | |
2207 wrapper.klass_tag(), | |
2208 0, // referrer_class_tag is 0 for heap root | |
2209 wrapper.obj_size(), | |
2210 wrapper.obj_tag_p(), | |
2211 NULL, // referrer_tag_p | |
2212 len, | |
2213 (void*)user_data()); | |
2214 if (res & JVMTI_VISIT_ABORT) { | |
2215 return false;// referrer class tag | |
2216 } | |
2217 if (res & JVMTI_VISIT_OBJECTS) { | |
2218 check_for_visit(obj); | |
2219 } | |
2220 return true; | |
2221 } | |
2222 | |
2223 // report a reference from a thread stack to an object | |
2224 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
2225 jlong thread_tag, | |
2226 jlong tid, | |
2227 int depth, | |
2228 jmethodID method, | |
2229 jlocation bci, | |
2230 jint slot, | |
2231 oop obj) { | |
2232 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2233 | |
2234 AdvancedHeapWalkContext* context = advanced_context(); | |
2235 | |
2236 // check that callback is provider | |
2237 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2238 if (cb == NULL) { | |
2239 return check_for_visit(obj); | |
2240 } | |
2241 | |
2242 // apply class filter | |
2243 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2244 return check_for_visit(obj); | |
2245 } | |
2246 | |
2247 // setup the callback wrapper | |
2248 CallbackWrapper wrapper(tag_map(), obj); | |
2249 | |
2250 // apply tag filter | |
2251 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2252 wrapper.klass_tag(), | |
2253 context->heap_filter())) { | |
2254 return check_for_visit(obj); | |
2255 } | |
2256 | |
2257 // setup the referrer info | |
2258 jvmtiHeapReferenceInfo reference_info; | |
2259 reference_info.stack_local.thread_tag = thread_tag; | |
2260 reference_info.stack_local.thread_id = tid; | |
2261 reference_info.stack_local.depth = depth; | |
2262 reference_info.stack_local.method = method; | |
2263 reference_info.stack_local.location = bci; | |
2264 reference_info.stack_local.slot = slot; | |
2265 | |
2266 // for arrays we need the length, otherwise -1 | |
2267 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2268 | |
2269 // call into the agent | |
2270 int res = (*cb)(ref_kind, | |
2271 &reference_info, | |
2272 wrapper.klass_tag(), | |
2273 0, // referrer_class_tag is 0 for heap root (stack) | |
2274 wrapper.obj_size(), | |
2275 wrapper.obj_tag_p(), | |
2276 NULL, // referrer_tag is 0 for root | |
2277 len, | |
2278 (void*)user_data()); | |
2279 | |
2280 if (res & JVMTI_VISIT_ABORT) { | |
2281 return false; | |
2282 } | |
2283 if (res & JVMTI_VISIT_OBJECTS) { | |
2284 check_for_visit(obj); | |
2285 } | |
2286 return true; | |
2287 } | |
2288 | |
2289 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
2290 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
2291 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
2292 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
2293 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
2294 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
2295 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
2296 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
2297 | |
2298 // invoke the object reference callback to report a reference | |
2299 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
2300 oop referrer, | |
2301 oop obj, | |
2302 jint index) | |
2303 { | |
2304 // field index is only valid field in reference_info | |
2305 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2306 | |
2307 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2308 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2309 | |
2310 AdvancedHeapWalkContext* context = advanced_context(); | |
2311 | |
2312 // check that callback is provider | |
2313 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2314 if (cb == NULL) { | |
2315 return check_for_visit(obj); | |
2316 } | |
2317 | |
2318 // apply class filter | |
2319 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2320 return check_for_visit(obj); | |
2321 } | |
2322 | |
2323 // setup the callback wrapper | |
2324 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
2325 | |
2326 // apply tag filter | |
2327 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2328 wrapper.klass_tag(), | |
2329 context->heap_filter())) { | |
2330 return check_for_visit(obj); | |
2331 } | |
2332 | |
2333 // field index is only valid field in reference_info | |
2334 reference_info.field.index = index; | |
2335 | |
2336 // for arrays we need the length, otherwise -1 | |
2337 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2338 | |
2339 // invoke the callback | |
2340 int res = (*cb)(ref_kind, | |
2341 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
2342 wrapper.klass_tag(), | |
2343 wrapper.referrer_klass_tag(), | |
2344 wrapper.obj_size(), | |
2345 wrapper.obj_tag_p(), | |
2346 wrapper.referrer_tag_p(), | |
2347 len, | |
2348 (void*)user_data()); | |
2349 | |
2350 if (res & JVMTI_VISIT_ABORT) { | |
2351 return false; | |
2352 } | |
2353 if (res & JVMTI_VISIT_OBJECTS) { | |
2354 check_for_visit(obj); | |
2355 } | |
2356 return true; | |
2357 } | |
2358 | |
2359 // report a "simple root" | |
2360 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
2361 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
2362 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
2363 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2364 | |
2365 if (is_basic_heap_walk()) { | |
2366 // map to old style root kind | |
2367 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
2368 return invoke_basic_heap_root_callback(root_kind, obj); | |
2369 } else { | |
2370 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
2371 return invoke_advanced_heap_root_callback(kind, obj); | |
2372 } | |
2373 } | |
2374 | |
2375 | |
2376 // invoke the primitive array values | |
2377 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
2378 assert(obj->is_typeArray(), "not a primitive array"); | |
2379 | |
2380 AdvancedHeapWalkContext* context = advanced_context(); | |
2381 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
2382 | |
2383 // apply class filter | |
2384 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2385 return true; | |
2386 } | |
2387 | |
2388 CallbackWrapper wrapper(tag_map(), obj); | |
2389 | |
2390 // apply tag filter | |
2391 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2392 wrapper.klass_tag(), | |
2393 context->heap_filter())) { | |
2394 return true; | |
2395 } | |
2396 | |
2397 // invoke the callback | |
2398 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
2399 &wrapper, | |
2400 obj, | |
2401 (void*)user_data()); | |
2402 return (!(res & JVMTI_VISIT_ABORT)); | |
2403 } | |
2404 | |
2405 // invoke the string value callback | |
2406 inline bool CallbackInvoker::report_string_value(oop str) { | |
1142 | 2407 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 2408 |
2409 AdvancedHeapWalkContext* context = advanced_context(); | |
2410 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
2411 | |
2412 // apply class filter | |
2413 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
2414 return true; | |
2415 } | |
2416 | |
2417 CallbackWrapper wrapper(tag_map(), str); | |
2418 | |
2419 // apply tag filter | |
2420 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2421 wrapper.klass_tag(), | |
2422 context->heap_filter())) { | |
2423 return true; | |
2424 } | |
2425 | |
2426 // invoke the callback | |
2427 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
2428 &wrapper, | |
2429 str, | |
2430 (void*)user_data()); | |
2431 return (!(res & JVMTI_VISIT_ABORT)); | |
2432 } | |
2433 | |
2434 // invoke the primitive field callback | |
2435 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
2436 oop obj, | |
2437 jint index, | |
2438 address addr, | |
2439 char type) | |
2440 { | |
2441 // for primitive fields only the index will be set | |
2442 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2443 | |
2444 AdvancedHeapWalkContext* context = advanced_context(); | |
2445 assert(context->primitive_field_callback() != NULL, "no callback"); | |
2446 | |
2447 // apply class filter | |
2448 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2449 return true; | |
2450 } | |
2451 | |
2452 CallbackWrapper wrapper(tag_map(), obj); | |
2453 | |
2454 // apply tag filter | |
2455 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2456 wrapper.klass_tag(), | |
2457 context->heap_filter())) { | |
2458 return true; | |
2459 } | |
2460 | |
2461 // the field index in the referrer | |
2462 reference_info.field.index = index; | |
2463 | |
2464 // map the type | |
2465 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
2466 | |
2467 // setup the jvalue | |
2468 jvalue value; | |
2469 copy_to_jvalue(&value, addr, value_type); | |
2470 | |
2471 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
2472 int res = (*cb)(ref_kind, | |
2473 &reference_info, | |
2474 wrapper.klass_tag(), | |
2475 wrapper.obj_tag_p(), | |
2476 value, | |
2477 value_type, | |
2478 (void*)user_data()); | |
2479 return (!(res & JVMTI_VISIT_ABORT)); | |
2480 } | |
2481 | |
2482 | |
2483 // instance field | |
2484 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
2485 jint index, | |
2486 address value, | |
2487 char type) { | |
2488 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
2489 obj, | |
2490 index, | |
2491 value, | |
2492 type); | |
2493 } | |
2494 | |
2495 // static field | |
2496 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
2497 jint index, | |
2498 address value, | |
2499 char type) { | |
2500 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
2501 obj, | |
2502 index, | |
2503 value, | |
2504 type); | |
2505 } | |
2506 | |
2507 // report a JNI local (root object) to the profiler | |
2508 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
2509 if (is_basic_heap_walk()) { | |
2510 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
2511 thread_tag, | |
2512 depth, | |
2513 m, | |
2514 -1, | |
2515 obj); | |
2516 } else { | |
2517 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
2518 thread_tag, tid, | |
2519 depth, | |
2520 m, | |
2521 (jlocation)-1, | |
2522 -1, | |
2523 obj); | |
2524 } | |
2525 } | |
2526 | |
2527 | |
2528 // report a local (stack reference, root object) | |
2529 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
2530 jlong tid, | |
2531 jint depth, | |
2532 jmethodID method, | |
2533 jlocation bci, | |
2534 jint slot, | |
2535 oop obj) { | |
2536 if (is_basic_heap_walk()) { | |
2537 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
2538 thread_tag, | |
2539 depth, | |
2540 method, | |
2541 slot, | |
2542 obj); | |
2543 } else { | |
2544 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
2545 thread_tag, | |
2546 tid, | |
2547 depth, | |
2548 method, | |
2549 bci, | |
2550 slot, | |
2551 obj); | |
2552 } | |
2553 } | |
2554 | |
2555 // report an object referencing a class. | |
2556 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
2557 if (is_basic_heap_walk()) { | |
2558 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2559 } else { | |
2560 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
2561 } | |
2562 } | |
2563 | |
2564 // report a class referencing its class loader. | |
2565 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
2566 if (is_basic_heap_walk()) { | |
2567 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2568 } else { | |
2569 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2570 } | |
2571 } | |
2572 | |
2573 // report a class referencing its signers. | |
2574 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
2575 if (is_basic_heap_walk()) { | |
2576 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
2577 } else { | |
2578 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
2579 } | |
2580 } | |
2581 | |
2582 // report a class referencing its protection domain.. | |
2583 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
2584 if (is_basic_heap_walk()) { | |
2585 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2586 } else { | |
2587 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2588 } | |
2589 } | |
2590 | |
2591 // report a class referencing its superclass. | |
2592 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
2593 if (is_basic_heap_walk()) { | |
2594 // Send this to be consistent with past implementation | |
2595 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2596 } else { | |
2597 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); | |
2598 } | |
2599 } | |
2600 | |
2601 // report a class referencing one of its interfaces. | |
2602 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
2603 if (is_basic_heap_walk()) { | |
2604 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
2605 } else { | |
2606 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
2607 } | |
2608 } | |
2609 | |
2610 // report a class referencing one of its static fields. | |
2611 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
2612 if (is_basic_heap_walk()) { | |
2613 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2614 } else { | |
2615 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2616 } | |
2617 } | |
2618 | |
2619 // report an array referencing an element object | |
2620 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
2621 if (is_basic_heap_walk()) { | |
2622 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2623 } else { | |
2624 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2625 } | |
2626 } | |
2627 | |
2628 // report an object referencing an instance field object | |
2629 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
2630 if (is_basic_heap_walk()) { | |
2631 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
2632 } else { | |
2633 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
2634 } | |
2635 } | |
2636 | |
2637 // report an array referencing an element object | |
2638 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
2639 if (is_basic_heap_walk()) { | |
2640 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2641 } else { | |
2642 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2643 } | |
2644 } | |
2645 | |
2646 // A supporting closure used to process simple roots | |
2647 class SimpleRootsClosure : public OopClosure { | |
2648 private: | |
2649 jvmtiHeapReferenceKind _kind; | |
2650 bool _continue; | |
2651 | |
2652 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
2653 | |
2654 public: | |
2655 void set_kind(jvmtiHeapReferenceKind kind) { | |
2656 _kind = kind; | |
2657 _continue = true; | |
2658 } | |
2659 | |
2660 inline bool stopped() { | |
2661 return !_continue; | |
2662 } | |
2663 | |
2664 void do_oop(oop* obj_p) { | |
2665 // iteration has terminated | |
2666 if (stopped()) { | |
2667 return; | |
2668 } | |
2669 | |
2670 // ignore null or deleted handles | |
2671 oop o = *obj_p; | |
2672 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2673 return; | |
2674 } | |
2675 | |
2676 jvmtiHeapReferenceKind kind = root_kind(); | |
2677 | |
2678 // many roots are Klasses so we use the java mirror | |
2679 if (o->is_klass()) { | |
2680 klassOop k = (klassOop)o; | |
2681 o = Klass::cast(k)->java_mirror(); | |
2682 } else { | |
2683 | |
2684 // SystemDictionary::always_strong_oops_do reports the application | |
2685 // class loader as a root. We want this root to be reported as | |
2686 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
2687 if (o->is_instance() && root_kind() == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { | |
2688 kind = JVMTI_HEAP_REFERENCE_OTHER; | |
2689 } | |
2690 } | |
2691 | |
2692 // some objects are ignored - in the case of simple | |
2693 // roots it's mostly symbolOops that we are skipping | |
2694 // here. | |
2695 if (!ServiceUtil::visible_oop(o)) { | |
2696 return; | |
2697 } | |
2698 | |
2699 // invoke the callback | |
2700 _continue = CallbackInvoker::report_simple_root(kind, o); | |
2701 | |
2702 } | |
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2703 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2704 }; |
2705 | |
2706 // A supporting closure used to process JNI locals | |
2707 class JNILocalRootsClosure : public OopClosure { | |
2708 private: | |
2709 jlong _thread_tag; | |
2710 jlong _tid; | |
2711 jint _depth; | |
2712 jmethodID _method; | |
2713 bool _continue; | |
2714 public: | |
2715 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
2716 _thread_tag = thread_tag; | |
2717 _tid = tid; | |
2718 _depth = depth; | |
2719 _method = method; | |
2720 _continue = true; | |
2721 } | |
2722 | |
2723 inline bool stopped() { | |
2724 return !_continue; | |
2725 } | |
2726 | |
2727 void do_oop(oop* obj_p) { | |
2728 // iteration has terminated | |
2729 if (stopped()) { | |
2730 return; | |
2731 } | |
2732 | |
2733 // ignore null or deleted handles | |
2734 oop o = *obj_p; | |
2735 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2736 return; | |
2737 } | |
2738 | |
2739 if (!ServiceUtil::visible_oop(o)) { | |
2740 return; | |
2741 } | |
2742 | |
2743 // invoke the callback | |
2744 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
2745 } | |
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diff
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|
2746 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2747 }; |
2748 | |
2749 | |
2750 // A VM operation to iterate over objects that are reachable from | |
2751 // a set of roots or an initial object. | |
2752 // | |
2753 // For VM_HeapWalkOperation the set of roots used is :- | |
2754 // | |
2755 // - All JNI global references | |
2756 // - All inflated monitors | |
2757 // - All classes loaded by the boot class loader (or all classes | |
2758 // in the event that class unloading is disabled) | |
2759 // - All java threads | |
2760 // - For each java thread then all locals and JNI local references | |
2761 // on the thread's execution stack | |
2762 // - All visible/explainable objects from Universes::oops_do | |
2763 // | |
2764 class VM_HeapWalkOperation: public VM_Operation { | |
2765 private: | |
2766 enum { | |
2767 initial_visit_stack_size = 4000 | |
2768 }; | |
2769 | |
2770 bool _is_advanced_heap_walk; // indicates FollowReferences | |
2771 JvmtiTagMap* _tag_map; | |
2772 Handle _initial_object; | |
2773 GrowableArray<oop>* _visit_stack; // the visit stack | |
2774 | |
2775 bool _collecting_heap_roots; // are we collecting roots | |
2776 bool _following_object_refs; // are we following object references | |
2777 | |
2778 bool _reporting_primitive_fields; // optional reporting | |
2779 bool _reporting_primitive_array_values; | |
2780 bool _reporting_string_values; | |
2781 | |
2782 GrowableArray<oop>* create_visit_stack() { | |
2783 return new (ResourceObj::C_HEAP) GrowableArray<oop>(initial_visit_stack_size, true); | |
2784 } | |
2785 | |
2786 // accessors | |
2787 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
2788 JvmtiTagMap* tag_map() const { return _tag_map; } | |
2789 Handle initial_object() const { return _initial_object; } | |
2790 | |
2791 bool is_following_references() const { return _following_object_refs; } | |
2792 | |
2793 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
2794 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
2795 bool is_reporting_string_values() const { return _reporting_string_values; } | |
2796 | |
2797 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
2798 | |
2799 // iterate over the various object types | |
2800 inline bool iterate_over_array(oop o); | |
2801 inline bool iterate_over_type_array(oop o); | |
2802 inline bool iterate_over_class(klassOop o); | |
2803 inline bool iterate_over_object(oop o); | |
2804 | |
2805 // root collection | |
2806 inline bool collect_simple_roots(); | |
2807 inline bool collect_stack_roots(); | |
2808 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
2809 | |
2810 // visit an object | |
2811 inline bool visit(oop o); | |
2812 | |
2813 public: | |
2814 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2815 Handle initial_object, | |
2816 BasicHeapWalkContext callbacks, | |
2817 const void* user_data); | |
2818 | |
2819 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2820 Handle initial_object, | |
2821 AdvancedHeapWalkContext callbacks, | |
2822 const void* user_data); | |
2823 | |
2824 ~VM_HeapWalkOperation(); | |
2825 | |
2826 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
2827 void doit(); | |
2828 }; | |
2829 | |
2830 | |
2831 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2832 Handle initial_object, | |
2833 BasicHeapWalkContext callbacks, | |
2834 const void* user_data) { | |
2835 _is_advanced_heap_walk = false; | |
2836 _tag_map = tag_map; | |
2837 _initial_object = initial_object; | |
2838 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
2839 _reporting_primitive_fields = false; | |
2840 _reporting_primitive_array_values = false; | |
2841 _reporting_string_values = false; | |
2842 _visit_stack = create_visit_stack(); | |
2843 | |
2844 | |
2845 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2846 } | |
2847 | |
2848 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2849 Handle initial_object, | |
2850 AdvancedHeapWalkContext callbacks, | |
2851 const void* user_data) { | |
2852 _is_advanced_heap_walk = true; | |
2853 _tag_map = tag_map; | |
2854 _initial_object = initial_object; | |
2855 _following_object_refs = true; | |
2856 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
2857 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
2858 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
2859 _visit_stack = create_visit_stack(); | |
2860 | |
2861 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2862 } | |
2863 | |
2864 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
2865 if (_following_object_refs) { | |
2866 assert(_visit_stack != NULL, "checking"); | |
2867 delete _visit_stack; | |
2868 _visit_stack = NULL; | |
2869 } | |
2870 } | |
2871 | |
2872 // an array references its class and has a reference to | |
2873 // each element in the array | |
2874 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
2875 objArrayOop array = objArrayOop(o); | |
2876 if (array->klass() == Universe::systemObjArrayKlassObj()) { | |
2877 // filtered out | |
2878 return true; | |
2879 } | |
2880 | |
2881 // array reference to its class | |
2882 oop mirror = objArrayKlass::cast(array->klass())->java_mirror(); | |
2883 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
2884 return false; | |
2885 } | |
2886 | |
2887 // iterate over the array and report each reference to a | |
2888 // non-null element | |
2889 for (int index=0; index<array->length(); index++) { | |
2890 oop elem = array->obj_at(index); | |
2891 if (elem == NULL) { | |
2892 continue; | |
2893 } | |
2894 | |
2895 // report the array reference o[index] = elem | |
2896 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
2897 return false; | |
2898 } | |
2899 } | |
2900 return true; | |
2901 } | |
2902 | |
2903 // a type array references its class | |
2904 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
2905 klassOop k = o->klass(); | |
2906 oop mirror = Klass::cast(k)->java_mirror(); | |
2907 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
2908 return false; | |
2909 } | |
2910 | |
2911 // report the array contents if required | |
2912 if (is_reporting_primitive_array_values()) { | |
2913 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
2914 return false; | |
2915 } | |
2916 } | |
2917 return true; | |
2918 } | |
2919 | |
2920 // verify that a static oop field is in range | |
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2921 static inline bool verify_static_oop(instanceKlass* ik, |
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2922 klassOop k, int offset) { |
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2923 address obj_p = (address)k + offset; |
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2924 address start = (address)ik->start_of_static_fields(); |
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2925 address end = start + (ik->static_oop_field_size() * heapOopSize); |
0 | 2926 assert(end >= start, "sanity check"); |
2927 | |
2928 if (obj_p >= start && obj_p < end) { | |
2929 return true; | |
2930 } else { | |
2931 return false; | |
2932 } | |
2933 } | |
2934 | |
2935 // a class references its super class, interfaces, class loader, ... | |
2936 // and finally its static fields | |
2937 inline bool VM_HeapWalkOperation::iterate_over_class(klassOop k) { | |
2938 int i; | |
2939 Klass* klass = klassOop(k)->klass_part(); | |
2940 | |
2941 if (klass->oop_is_instance()) { | |
2942 instanceKlass* ik = instanceKlass::cast(k); | |
2943 | |
2944 // ignore the class if it's has been initialized yet | |
2945 if (!ik->is_linked()) { | |
2946 return true; | |
2947 } | |
2948 | |
2949 // get the java mirror | |
2950 oop mirror = klass->java_mirror(); | |
2951 | |
2952 // super (only if something more interesting than java.lang.Object) | |
2953 klassOop java_super = ik->java_super(); | |
1142 | 2954 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
0 | 2955 oop super = Klass::cast(java_super)->java_mirror(); |
2956 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { | |
2957 return false; | |
2958 } | |
2959 } | |
2960 | |
2961 // class loader | |
2962 oop cl = ik->class_loader(); | |
2963 if (cl != NULL) { | |
2964 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
2965 return false; | |
2966 } | |
2967 } | |
2968 | |
2969 // protection domain | |
2970 oop pd = ik->protection_domain(); | |
2971 if (pd != NULL) { | |
2972 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
2973 return false; | |
2974 } | |
2975 } | |
2976 | |
2977 // signers | |
2978 oop signers = ik->signers(); | |
2979 if (signers != NULL) { | |
2980 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
2981 return false; | |
2982 } | |
2983 } | |
2984 | |
2985 // references from the constant pool | |
2986 { | |
2987 const constantPoolOop pool = ik->constants(); | |
2988 for (int i = 1; i < pool->length(); i++) { | |
2989 constantTag tag = pool->tag_at(i).value(); | |
2990 if (tag.is_string() || tag.is_klass()) { | |
2991 oop entry; | |
2992 if (tag.is_string()) { | |
2993 entry = pool->resolved_string_at(i); | |
2994 assert(java_lang_String::is_instance(entry), "must be string"); | |
2995 } else { | |
2996 entry = Klass::cast(pool->resolved_klass_at(i))->java_mirror(); | |
2997 } | |
2998 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
2999 return false; | |
3000 } | |
3001 } | |
3002 } | |
3003 } | |
3004 | |
3005 // interfaces | |
3006 // (These will already have been reported as references from the constant pool | |
3007 // but are specified by IterateOverReachableObjects and must be reported). | |
3008 objArrayOop interfaces = ik->local_interfaces(); | |
3009 for (i = 0; i < interfaces->length(); i++) { | |
3010 oop interf = Klass::cast((klassOop)interfaces->obj_at(i))->java_mirror(); | |
3011 if (interf == NULL) { | |
3012 continue; | |
3013 } | |
3014 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
3015 return false; | |
3016 } | |
3017 } | |
3018 | |
3019 // iterate over the static fields | |
3020 | |
3021 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
3022 for (i=0; i<field_map->field_count(); i++) { | |
3023 ClassFieldDescriptor* field = field_map->field_at(i); | |
3024 char type = field->field_type(); | |
3025 if (!is_primitive_field_type(type)) { | |
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3026 oop fld_o = k->obj_field(field->field_offset()); |
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3027 assert(verify_static_oop(ik, k, field->field_offset()), "sanity check"); |
0 | 3028 if (fld_o != NULL) { |
3029 int slot = field->field_index(); | |
3030 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
3031 delete field_map; | |
3032 return false; | |
3033 } | |
3034 } | |
3035 } else { | |
3036 if (is_reporting_primitive_fields()) { | |
3037 address addr = (address)k + field->field_offset(); | |
3038 int slot = field->field_index(); | |
3039 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
3040 delete field_map; | |
3041 return false; | |
3042 } | |
3043 } | |
3044 } | |
3045 } | |
3046 delete field_map; | |
3047 | |
3048 return true; | |
3049 } | |
3050 | |
3051 return true; | |
3052 } | |
3053 | |
3054 // an object references a class and its instance fields | |
3055 // (static fields are ignored here as we report these as | |
3056 // references from the class). | |
3057 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
3058 // reference to the class | |
3059 if (!CallbackInvoker::report_class_reference(o, Klass::cast(o->klass())->java_mirror())) { | |
3060 return false; | |
3061 } | |
3062 | |
3063 // iterate over instance fields | |
3064 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
3065 for (int i=0; i<field_map->field_count(); i++) { | |
3066 ClassFieldDescriptor* field = field_map->field_at(i); | |
3067 char type = field->field_type(); | |
3068 if (!is_primitive_field_type(type)) { | |
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3069 oop fld_o = o->obj_field(field->field_offset()); |
0 | 3070 if (fld_o != NULL) { |
3071 // reflection code may have a reference to a klassOop. | |
3072 // - see sun.reflect.UnsafeStaticFieldAccessorImpl and sun.misc.Unsafe | |
3073 if (fld_o->is_klass()) { | |
3074 klassOop k = (klassOop)fld_o; | |
3075 fld_o = Klass::cast(k)->java_mirror(); | |
3076 } | |
3077 int slot = field->field_index(); | |
3078 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
3079 return false; | |
3080 } | |
3081 } | |
3082 } else { | |
3083 if (is_reporting_primitive_fields()) { | |
3084 // primitive instance field | |
3085 address addr = (address)o + field->field_offset(); | |
3086 int slot = field->field_index(); | |
3087 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
3088 return false; | |
3089 } | |
3090 } | |
3091 } | |
3092 } | |
3093 | |
3094 // if the object is a java.lang.String | |
3095 if (is_reporting_string_values() && | |
1142 | 3096 o->klass() == SystemDictionary::String_klass()) { |
0 | 3097 if (!CallbackInvoker::report_string_value(o)) { |
3098 return false; | |
3099 } | |
3100 } | |
3101 return true; | |
3102 } | |
3103 | |
3104 | |
3105 // collects all simple (non-stack) roots. | |
3106 // if there's a heap root callback provided then the callback is | |
3107 // invoked for each simple root. | |
3108 // if an object reference callback is provided then all simple | |
3109 // roots are pushed onto the marking stack so that they can be | |
3110 // processed later | |
3111 // | |
3112 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
3113 SimpleRootsClosure blk; | |
3114 | |
3115 // JNI globals | |
3116 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
3117 JNIHandles::oops_do(&blk); | |
3118 if (blk.stopped()) { | |
3119 return false; | |
3120 } | |
3121 | |
3122 // Preloaded classes and loader from the system dictionary | |
3123 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
3124 SystemDictionary::always_strong_oops_do(&blk); | |
3125 if (blk.stopped()) { | |
3126 return false; | |
3127 } | |
3128 | |
3129 // Inflated monitors | |
3130 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
3131 ObjectSynchronizer::oops_do(&blk); | |
3132 if (blk.stopped()) { | |
3133 return false; | |
3134 } | |
3135 | |
3136 // Threads | |
3137 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
3138 oop threadObj = thread->threadObj(); | |
3139 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
3140 bool cont = CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, threadObj); | |
3141 if (!cont) { | |
3142 return false; | |
3143 } | |
3144 } | |
3145 } | |
3146 | |
3147 // Other kinds of roots maintained by HotSpot | |
3148 // Many of these won't be visible but others (such as instances of important | |
3149 // exceptions) will be visible. | |
3150 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
3151 Universe::oops_do(&blk); | |
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3152 |
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3153 // If there are any non-perm roots in the code cache, visit them. |
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3154 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
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3155 CodeBlobToOopClosure look_in_blobs(&blk, false); |
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3156 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
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3157 |
0 | 3158 return true; |
3159 } | |
3160 | |
3161 // Walk the stack of a given thread and find all references (locals | |
3162 // and JNI calls) and report these as stack references | |
3163 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
3164 JNILocalRootsClosure* blk) | |
3165 { | |
3166 oop threadObj = java_thread->threadObj(); | |
3167 assert(threadObj != NULL, "sanity check"); | |
3168 | |
3169 // only need to get the thread's tag once per thread | |
3170 jlong thread_tag = tag_for(_tag_map, threadObj); | |
3171 | |
3172 // also need the thread id | |
3173 jlong tid = java_lang_Thread::thread_id(threadObj); | |
3174 | |
3175 | |
3176 if (java_thread->has_last_Java_frame()) { | |
3177 | |
3178 // vframes are resource allocated | |
3179 Thread* current_thread = Thread::current(); | |
3180 ResourceMark rm(current_thread); | |
3181 HandleMark hm(current_thread); | |
3182 | |
3183 RegisterMap reg_map(java_thread); | |
3184 frame f = java_thread->last_frame(); | |
3185 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
3186 | |
3187 bool is_top_frame = true; | |
3188 int depth = 0; | |
3189 frame* last_entry_frame = NULL; | |
3190 | |
3191 while (vf != NULL) { | |
3192 if (vf->is_java_frame()) { | |
3193 | |
3194 // java frame (interpreted, compiled, ...) | |
3195 javaVFrame *jvf = javaVFrame::cast(vf); | |
3196 | |
3197 // the jmethodID | |
3198 jmethodID method = jvf->method()->jmethod_id(); | |
3199 | |
3200 if (!(jvf->method()->is_native())) { | |
3201 jlocation bci = (jlocation)jvf->bci(); | |
3202 StackValueCollection* locals = jvf->locals(); | |
3203 for (int slot=0; slot<locals->size(); slot++) { | |
3204 if (locals->at(slot)->type() == T_OBJECT) { | |
3205 oop o = locals->obj_at(slot)(); | |
3206 if (o == NULL) { | |
3207 continue; | |
3208 } | |
3209 | |
3210 // stack reference | |
3211 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
3212 bci, slot, o)) { | |
3213 return false; | |
3214 } | |
3215 } | |
3216 } | |
3217 } else { | |
3218 blk->set_context(thread_tag, tid, depth, method); | |
3219 if (is_top_frame) { | |
3220 // JNI locals for the top frame. | |
3221 java_thread->active_handles()->oops_do(blk); | |
3222 } else { | |
3223 if (last_entry_frame != NULL) { | |
3224 // JNI locals for the entry frame | |
3225 assert(last_entry_frame->is_entry_frame(), "checking"); | |
3226 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
3227 } | |
3228 } | |
3229 } | |
3230 last_entry_frame = NULL; | |
3231 depth++; | |
3232 } else { | |
3233 // externalVFrame - for an entry frame then we report the JNI locals | |
3234 // when we find the corresponding javaVFrame | |
3235 frame* fr = vf->frame_pointer(); | |
3236 assert(fr != NULL, "sanity check"); | |
3237 if (fr->is_entry_frame()) { | |
3238 last_entry_frame = fr; | |
3239 } | |
3240 } | |
3241 | |
3242 vf = vf->sender(); | |
3243 is_top_frame = false; | |
3244 } | |
3245 } else { | |
3246 // no last java frame but there may be JNI locals | |
3247 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
3248 java_thread->active_handles()->oops_do(blk); | |
3249 } | |
3250 return true; | |
3251 } | |
3252 | |
3253 | |
3254 // collects all stack roots - for each thread it walks the execution | |
3255 // stack to find all references and local JNI refs. | |
3256 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
3257 JNILocalRootsClosure blk; | |
3258 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
3259 oop threadObj = thread->threadObj(); | |
3260 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
3261 if (!collect_stack_roots(thread, &blk)) { | |
3262 return false; | |
3263 } | |
3264 } | |
3265 } | |
3266 return true; | |
3267 } | |
3268 | |
3269 // visit an object | |
3270 // first mark the object as visited | |
3271 // second get all the outbound references from this object (in other words, all | |
3272 // the objects referenced by this object). | |
3273 // | |
3274 bool VM_HeapWalkOperation::visit(oop o) { | |
3275 // mark object as visited | |
3276 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
3277 ObjectMarker::mark(o); | |
3278 | |
3279 // instance | |
3280 if (o->is_instance()) { | |
1142 | 3281 if (o->klass() == SystemDictionary::Class_klass()) { |
0 | 3282 o = klassOop_if_java_lang_Class(o); |
3283 if (o->is_klass()) { | |
3284 // a java.lang.Class | |
3285 return iterate_over_class(klassOop(o)); | |
3286 } | |
3287 } else { | |
3288 return iterate_over_object(o); | |
3289 } | |
3290 } | |
3291 | |
3292 // object array | |
3293 if (o->is_objArray()) { | |
3294 return iterate_over_array(o); | |
3295 } | |
3296 | |
3297 // type array | |
3298 if (o->is_typeArray()) { | |
3299 return iterate_over_type_array(o); | |
3300 } | |
3301 | |
3302 return true; | |
3303 } | |
3304 | |
3305 void VM_HeapWalkOperation::doit() { | |
3306 ResourceMark rm; | |
3307 ObjectMarkerController marker; | |
3308 ClassFieldMapCacheMark cm; | |
3309 | |
3310 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
3311 | |
3312 // the heap walk starts with an initial object or the heap roots | |
3313 if (initial_object().is_null()) { | |
3314 if (!collect_simple_roots()) return; | |
3315 if (!collect_stack_roots()) return; | |
3316 } else { | |
3317 visit_stack()->push(initial_object()()); | |
3318 } | |
3319 | |
3320 // object references required | |
3321 if (is_following_references()) { | |
3322 | |
3323 // visit each object until all reachable objects have been | |
3324 // visited or the callback asked to terminate the iteration. | |
3325 while (!visit_stack()->is_empty()) { | |
3326 oop o = visit_stack()->pop(); | |
3327 if (!ObjectMarker::visited(o)) { | |
3328 if (!visit(o)) { | |
3329 break; | |
3330 } | |
3331 } | |
3332 } | |
3333 } | |
3334 } | |
3335 | |
3336 // iterate over all objects that are reachable from a set of roots | |
3337 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
3338 jvmtiStackReferenceCallback stack_ref_callback, | |
3339 jvmtiObjectReferenceCallback object_ref_callback, | |
3340 const void* user_data) { | |
3341 MutexLocker ml(Heap_lock); | |
3342 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
3343 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
3344 VMThread::execute(&op); | |
3345 } | |
3346 | |
3347 // iterate over all objects that are reachable from a given object | |
3348 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
3349 jvmtiObjectReferenceCallback object_ref_callback, | |
3350 const void* user_data) { | |
3351 oop obj = JNIHandles::resolve(object); | |
3352 Handle initial_object(Thread::current(), obj); | |
3353 | |
3354 MutexLocker ml(Heap_lock); | |
3355 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
3356 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3357 VMThread::execute(&op); | |
3358 } | |
3359 | |
3360 // follow references from an initial object or the GC roots | |
3361 void JvmtiTagMap::follow_references(jint heap_filter, | |
3362 KlassHandle klass, | |
3363 jobject object, | |
3364 const jvmtiHeapCallbacks* callbacks, | |
3365 const void* user_data) | |
3366 { | |
3367 oop obj = JNIHandles::resolve(object); | |
3368 Handle initial_object(Thread::current(), obj); | |
3369 | |
3370 MutexLocker ml(Heap_lock); | |
3371 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
3372 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3373 VMThread::execute(&op); | |
3374 } | |
3375 | |
3376 | |
3377 // called post-GC | |
3378 // - for each JVMTI environment with an object tag map, call its rehash | |
3379 // function to re-sync with the new object locations. | |
3380 void JvmtiTagMap::gc_epilogue(bool full) { | |
3381 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint"); | |
3382 if (JvmtiEnv::environments_might_exist()) { | |
3383 // re-obtain the memory region for the young generation (might | |
3384 // changed due to adaptive resizing policy) | |
3385 get_young_generation(); | |
3386 | |
3387 JvmtiEnvIterator it; | |
3388 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
3389 JvmtiTagMap* tag_map = env->tag_map(); | |
3390 if (tag_map != NULL && !tag_map->is_empty()) { | |
3391 TraceTime t(full ? "JVMTI Full Rehash " : "JVMTI Rehash ", TraceJVMTIObjectTagging); | |
3392 if (full) { | |
3393 tag_map->rehash(0, n_hashmaps); | |
3394 } else { | |
3395 tag_map->rehash(0, 0); // tag map for young gen only | |
3396 } | |
3397 } | |
3398 } | |
3399 } | |
3400 } | |
3401 | |
3402 // CMS has completed referencing processing so we may have JNI weak refs | |
3403 // to objects in the CMS generation that have been GC'ed. | |
3404 void JvmtiTagMap::cms_ref_processing_epilogue() { | |
3405 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint"); | |
3406 assert(UseConcMarkSweepGC, "should only be used with CMS"); | |
3407 if (JvmtiEnv::environments_might_exist()) { | |
3408 JvmtiEnvIterator it; | |
3409 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
3410 JvmtiTagMap* tag_map = ((JvmtiEnvBase *)env)->tag_map(); | |
3411 if (tag_map != NULL && !tag_map->is_empty()) { | |
3412 TraceTime t("JVMTI Rehash (CMS) ", TraceJVMTIObjectTagging); | |
3413 tag_map->rehash(1, n_hashmaps); // assume CMS not used in young gen | |
3414 } | |
3415 } | |
3416 } | |
3417 } | |
3418 | |
3419 | |
3420 // For each entry in the hashmaps 'start' to 'end' : | |
3421 // | |
3422 // 1. resolve the JNI weak reference | |
3423 // | |
3424 // 2. If it resolves to NULL it means the object has been freed so the entry | |
3425 // is removed, the weak reference destroyed, and the object free event is | |
3426 // posted (if enabled). | |
3427 // | |
3428 // 3. If the weak reference resolves to an object then we re-hash the object | |
3429 // to see if it has moved or has been promoted (from the young to the old | |
3430 // generation for example). | |
3431 // | |
3432 void JvmtiTagMap::rehash(int start, int end) { | |
3433 | |
3434 // does this environment have the OBJECT_FREE event enabled | |
3435 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
3436 | |
3437 // counters used for trace message | |
3438 int freed = 0; | |
3439 int moved = 0; | |
3440 int promoted = 0; | |
3441 | |
3442 // we assume there are two hashmaps - one for the young generation | |
3443 // and the other for all other spaces. | |
3444 assert(n_hashmaps == 2, "not implemented"); | |
3445 JvmtiTagHashmap* young_hashmap = _hashmap[0]; | |
3446 JvmtiTagHashmap* other_hashmap = _hashmap[1]; | |
3447 | |
3448 // reenable sizing (if disabled) | |
3449 young_hashmap->set_resizing_enabled(true); | |
3450 other_hashmap->set_resizing_enabled(true); | |
3451 | |
3452 // when re-hashing the hashmap corresponding to the young generation we | |
3453 // collect the entries corresponding to objects that have been promoted. | |
3454 JvmtiTagHashmapEntry* promoted_entries = NULL; | |
3455 | |
3456 if (end >= n_hashmaps) { | |
3457 end = n_hashmaps - 1; | |
3458 } | |
3459 | |
3460 for (int i=start; i <= end; i++) { | |
3461 JvmtiTagHashmap* hashmap = _hashmap[i]; | |
3462 | |
3463 // if the hashmap is empty then we can skip it | |
3464 if (hashmap->_entry_count == 0) { | |
3465 continue; | |
3466 } | |
3467 | |
3468 // now iterate through each entry in the table | |
3469 | |
3470 JvmtiTagHashmapEntry** table = hashmap->table(); | |
3471 int size = hashmap->size(); | |
3472 | |
3473 for (int pos=0; pos<size; pos++) { | |
3474 JvmtiTagHashmapEntry* entry = table[pos]; | |
3475 JvmtiTagHashmapEntry* prev = NULL; | |
3476 | |
3477 while (entry != NULL) { | |
3478 JvmtiTagHashmapEntry* next = entry->next(); | |
3479 | |
3480 jweak ref = entry->object(); | |
3481 oop oop = JNIHandles::resolve(ref); | |
3482 | |
3483 // has object been GC'ed | |
3484 if (oop == NULL) { | |
3485 // grab the tag | |
3486 jlong tag = entry->tag(); | |
3487 guarantee(tag != 0, "checking"); | |
3488 | |
3489 // remove GC'ed entry from hashmap and return the | |
3490 // entry to the free list | |
3491 hashmap->remove(prev, pos, entry); | |
3492 destroy_entry(entry); | |
3493 | |
3494 // destroy the weak ref | |
3495 JNIHandles::destroy_weak_global(ref); | |
3496 | |
3497 // post the event to the profiler | |
3498 if (post_object_free) { | |
3499 JvmtiExport::post_object_free(env(), tag); | |
3500 } | |
3501 | |
3502 freed++; | |
3503 entry = next; | |
3504 continue; | |
3505 } | |
3506 | |
3507 // if this is the young hashmap then the object is either promoted | |
3508 // or moved. | |
3509 // if this is the other hashmap then the object is moved. | |
3510 | |
3511 bool same_gen; | |
3512 if (i == 0) { | |
3513 assert(hashmap == young_hashmap, "checking"); | |
3514 same_gen = is_in_young(oop); | |
3515 } else { | |
3516 same_gen = true; | |
3517 } | |
3518 | |
3519 | |
3520 if (same_gen) { | |
3521 // if the object has moved then re-hash it and move its | |
3522 // entry to its new location. | |
3523 unsigned int new_pos = JvmtiTagHashmap::hash(oop, size); | |
3524 if (new_pos != (unsigned int)pos) { | |
3525 if (prev == NULL) { | |
3526 table[pos] = next; | |
3527 } else { | |
3528 prev->set_next(next); | |
3529 } | |
3530 entry->set_next(table[new_pos]); | |
3531 table[new_pos] = entry; | |
3532 moved++; | |
3533 } else { | |
3534 // object didn't move | |
3535 prev = entry; | |
3536 } | |
3537 } else { | |
3538 // object has been promoted so remove the entry from the | |
3539 // young hashmap | |
3540 assert(hashmap == young_hashmap, "checking"); | |
3541 hashmap->remove(prev, pos, entry); | |
3542 | |
3543 // move the entry to the promoted list | |
3544 entry->set_next(promoted_entries); | |
3545 promoted_entries = entry; | |
3546 } | |
3547 | |
3548 entry = next; | |
3549 } | |
3550 } | |
3551 } | |
3552 | |
3553 | |
3554 // add the entries, corresponding to the promoted objects, to the | |
3555 // other hashmap. | |
3556 JvmtiTagHashmapEntry* entry = promoted_entries; | |
3557 while (entry != NULL) { | |
3558 oop o = JNIHandles::resolve(entry->object()); | |
3559 assert(hashmap_for(o) == other_hashmap, "checking"); | |
3560 JvmtiTagHashmapEntry* next = entry->next(); | |
3561 other_hashmap->add(o, entry); | |
3562 entry = next; | |
3563 promoted++; | |
3564 } | |
3565 | |
3566 // stats | |
3567 if (TraceJVMTIObjectTagging) { | |
3568 int total_moves = promoted + moved; | |
3569 | |
3570 int post_total = 0; | |
3571 for (int i=0; i<n_hashmaps; i++) { | |
3572 post_total += _hashmap[i]->_entry_count; | |
3573 } | |
3574 int pre_total = post_total + freed; | |
3575 | |
3576 tty->print("(%d->%d, %d freed, %d promoted, %d total moves)", | |
3577 pre_total, post_total, freed, promoted, total_moves); | |
3578 } | |
3579 } |