Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiTagMap.cpp @ 5073:2db1ad9dd385
rename PiNode.value to PiNode.object and UnsafeCastNode.x to UnsafeCastNode.object
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 14 Mar 2012 16:57:18 +0100 |
parents | 2b150750d53d |
children | 588f559105c1 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "jvmtifiles/jvmtiEnv.hpp" | |
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30 #include "oops/instanceMirrorKlass.hpp" |
1972 | 31 #include "oops/objArrayKlass.hpp" |
32 #include "oops/oop.inline2.hpp" | |
33 #include "prims/jvmtiEventController.hpp" | |
34 #include "prims/jvmtiEventController.inline.hpp" | |
35 #include "prims/jvmtiExport.hpp" | |
36 #include "prims/jvmtiImpl.hpp" | |
37 #include "prims/jvmtiTagMap.hpp" | |
38 #include "runtime/biasedLocking.hpp" | |
39 #include "runtime/javaCalls.hpp" | |
40 #include "runtime/jniHandles.hpp" | |
41 #include "runtime/mutex.hpp" | |
42 #include "runtime/mutexLocker.hpp" | |
43 #include "runtime/reflectionUtils.hpp" | |
44 #include "runtime/vframe.hpp" | |
45 #include "runtime/vmThread.hpp" | |
46 #include "runtime/vm_operations.hpp" | |
47 #include "services/serviceUtil.hpp" | |
48 #ifndef SERIALGC | |
49 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
50 #endif | |
0 | 51 |
52 // JvmtiTagHashmapEntry | |
53 // | |
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54 // Each entry encapsulates a reference to the tagged object |
0 | 55 // and the tag value. In addition an entry includes a next pointer which |
56 // is used to chain entries together. | |
57 | |
58 class JvmtiTagHashmapEntry : public CHeapObj { | |
59 private: | |
60 friend class JvmtiTagMap; | |
61 | |
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62 oop _object; // tagged object |
0 | 63 jlong _tag; // the tag |
64 JvmtiTagHashmapEntry* _next; // next on the list | |
65 | |
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66 inline void init(oop object, jlong tag) { |
0 | 67 _object = object; |
68 _tag = tag; | |
69 _next = NULL; | |
70 } | |
71 | |
72 // constructor | |
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73 JvmtiTagHashmapEntry(oop object, jlong tag) { init(object, tag); } |
0 | 74 |
75 public: | |
76 | |
77 // accessor methods | |
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78 inline oop object() const { return _object; } |
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79 inline oop* object_addr() { return &_object; } |
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80 inline jlong tag() const { return _tag; } |
0 | 81 |
82 inline void set_tag(jlong tag) { | |
83 assert(tag != 0, "can't be zero"); | |
84 _tag = tag; | |
85 } | |
86 | |
87 inline JvmtiTagHashmapEntry* next() const { return _next; } | |
88 inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; } | |
89 }; | |
90 | |
91 | |
92 // JvmtiTagHashmap | |
93 // | |
94 // A hashmap is essentially a table of pointers to entries. Entries | |
95 // are hashed to a location, or position in the table, and then | |
96 // chained from that location. The "key" for hashing is address of | |
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97 // the object, or oop. The "value" is the tag value. |
0 | 98 // |
99 // A hashmap maintains a count of the number entries in the hashmap | |
100 // and resizes if the number of entries exceeds a given threshold. | |
101 // The threshold is specified as a percentage of the size - for | |
102 // example a threshold of 0.75 will trigger the hashmap to resize | |
103 // if the number of entries is >75% of table size. | |
104 // | |
105 // A hashmap provides functions for adding, removing, and finding | |
106 // entries. It also provides a function to iterate over all entries | |
107 // in the hashmap. | |
108 | |
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(); | |
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209 oop key = entry->object(); |
0 | 210 assert(key != NULL, "jni weak reference cleared!!"); |
211 unsigned int h = hash(key, new_size); | |
212 JvmtiTagHashmapEntry* anchor = new_table[h]; | |
213 if (anchor == NULL) { | |
214 new_table[h] = entry; | |
215 entry->set_next(NULL); | |
216 } else { | |
217 entry->set_next(anchor); | |
218 new_table[h] = entry; | |
219 } | |
220 entry = next; | |
221 } | |
222 } | |
223 | |
224 // free old table and update settings. | |
225 os::free((void*)_table); | |
226 _table = new_table; | |
227 _size_index = new_size_index; | |
228 _size = new_size; | |
229 | |
230 // compute new resize threshold | |
231 _resize_threshold = (int)(_load_factor * _size); | |
232 } | |
233 | |
234 | |
235 // internal remove function - remove an entry at a given position in the | |
236 // table. | |
237 inline void remove(JvmtiTagHashmapEntry* prev, int pos, JvmtiTagHashmapEntry* entry) { | |
238 assert(pos >= 0 && pos < _size, "out of range"); | |
239 if (prev == NULL) { | |
240 _table[pos] = entry->next(); | |
241 } else { | |
242 prev->set_next(entry->next()); | |
243 } | |
244 assert(_entry_count > 0, "checking"); | |
245 _entry_count--; | |
246 } | |
247 | |
248 // resizing switch | |
249 bool is_resizing_enabled() const { return _resizing_enabled; } | |
250 void set_resizing_enabled(bool enable) { _resizing_enabled = enable; } | |
251 | |
252 // debugging | |
253 void print_memory_usage(); | |
254 void compute_next_trace_threshold(); | |
255 | |
256 public: | |
257 | |
258 // create a JvmtiTagHashmap of a preferred size and optionally a load factor. | |
259 // The preferred size is rounded down to an actual size. | |
260 JvmtiTagHashmap(int size, float load_factor=0.0f) { | |
261 int i=0; | |
262 while (_sizes[i] < size) { | |
263 if (_sizes[i] < 0) { | |
264 assert(i > 0, "sanity check"); | |
265 i--; | |
266 break; | |
267 } | |
268 i++; | |
269 } | |
270 | |
271 // if a load factor is specified then use it, otherwise use default | |
272 if (load_factor > 0.01f) { | |
273 init(i, load_factor); | |
274 } else { | |
275 init(i); | |
276 } | |
277 } | |
278 | |
279 // create a JvmtiTagHashmap with default settings | |
280 JvmtiTagHashmap() { | |
281 init(); | |
282 } | |
283 | |
284 // release table when JvmtiTagHashmap destroyed | |
285 ~JvmtiTagHashmap() { | |
286 if (_table != NULL) { | |
287 os::free((void*)_table); | |
288 _table = NULL; | |
289 } | |
290 } | |
291 | |
292 // accessors | |
293 int size() const { return _size; } | |
294 JvmtiTagHashmapEntry** table() const { return _table; } | |
295 int entry_count() const { return _entry_count; } | |
296 | |
297 // find an entry in the hashmap, returns NULL if not found. | |
298 inline JvmtiTagHashmapEntry* find(oop key) { | |
299 unsigned int h = hash(key); | |
300 JvmtiTagHashmapEntry* entry = _table[h]; | |
301 while (entry != NULL) { | |
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302 if (entry->object() == key) { |
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303 return entry; |
0 | 304 } |
305 entry = entry->next(); | |
306 } | |
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307 return NULL; |
0 | 308 } |
309 | |
310 | |
311 // add a new entry to hashmap | |
312 inline void add(oop key, JvmtiTagHashmapEntry* entry) { | |
313 assert(key != NULL, "checking"); | |
314 assert(find(key) == NULL, "duplicate detected"); | |
315 unsigned int h = hash(key); | |
316 JvmtiTagHashmapEntry* anchor = _table[h]; | |
317 if (anchor == NULL) { | |
318 _table[h] = entry; | |
319 entry->set_next(NULL); | |
320 } else { | |
321 entry->set_next(anchor); | |
322 _table[h] = entry; | |
323 } | |
324 | |
325 _entry_count++; | |
326 if (trace_threshold() > 0 && entry_count() >= trace_threshold()) { | |
327 assert(TraceJVMTIObjectTagging, "should only get here when tracing"); | |
328 print_memory_usage(); | |
329 compute_next_trace_threshold(); | |
330 } | |
331 | |
332 // if the number of entries exceed the threshold then resize | |
333 if (entry_count() > resize_threshold() && is_resizing_enabled()) { | |
334 resize(); | |
335 } | |
336 } | |
337 | |
338 // remove an entry with the given key. | |
339 inline JvmtiTagHashmapEntry* remove(oop key) { | |
340 unsigned int h = hash(key); | |
341 JvmtiTagHashmapEntry* entry = _table[h]; | |
342 JvmtiTagHashmapEntry* prev = NULL; | |
343 while (entry != NULL) { | |
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344 if (key == entry->object()) { |
0 | 345 break; |
346 } | |
347 prev = entry; | |
348 entry = entry->next(); | |
349 } | |
350 if (entry != NULL) { | |
351 remove(prev, h, entry); | |
352 } | |
353 return entry; | |
354 } | |
355 | |
356 // iterate over all entries in the hashmap | |
357 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); | |
358 }; | |
359 | |
360 // possible hashmap sizes - odd primes that roughly double in size. | |
361 // To avoid excessive resizing the odd primes from 4801-76831 and | |
362 // 76831-307261 have been removed. The list must be terminated by -1. | |
363 int JvmtiTagHashmap::_sizes[] = { 4801, 76831, 307261, 614563, 1228891, | |
364 2457733, 4915219, 9830479, 19660831, 39321619, 78643219, -1 }; | |
365 | |
366 | |
367 // A supporting class for iterating over all entries in Hashmap | |
368 class JvmtiTagHashmapEntryClosure { | |
369 public: | |
370 virtual void do_entry(JvmtiTagHashmapEntry* entry) = 0; | |
371 }; | |
372 | |
373 | |
374 // iterate over all entries in the hashmap | |
375 void JvmtiTagHashmap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
376 for (int i=0; i<_size; i++) { | |
377 JvmtiTagHashmapEntry* entry = _table[i]; | |
378 JvmtiTagHashmapEntry* prev = NULL; | |
379 while (entry != NULL) { | |
380 // obtain the next entry before invoking do_entry - this is | |
381 // necessary because do_entry may remove the entry from the | |
382 // hashmap. | |
383 JvmtiTagHashmapEntry* next = entry->next(); | |
384 closure->do_entry(entry); | |
385 entry = next; | |
386 } | |
387 } | |
388 } | |
389 | |
390 // debugging | |
391 void JvmtiTagHashmap::print_memory_usage() { | |
392 intptr_t p = (intptr_t)this; | |
393 tty->print("[JvmtiTagHashmap @ " INTPTR_FORMAT, p); | |
394 | |
395 // table + entries in KB | |
396 int hashmap_usage = (size()*sizeof(JvmtiTagHashmapEntry*) + | |
397 entry_count()*sizeof(JvmtiTagHashmapEntry))/K; | |
398 | |
399 int weak_globals_usage = (int)(JNIHandles::weak_global_handle_memory_usage()/K); | |
400 tty->print_cr(", %d entries (%d KB) <JNI weak globals: %d KB>]", | |
401 entry_count(), hashmap_usage, weak_globals_usage); | |
402 } | |
403 | |
404 // compute threshold for the next trace message | |
405 void JvmtiTagHashmap::compute_next_trace_threshold() { | |
406 if (trace_threshold() < medium_trace_threshold) { | |
407 _trace_threshold += small_trace_threshold; | |
408 } else { | |
409 if (trace_threshold() < large_trace_threshold) { | |
410 _trace_threshold += medium_trace_threshold; | |
411 } else { | |
412 _trace_threshold += large_trace_threshold; | |
413 } | |
414 } | |
415 } | |
416 | |
417 // create a JvmtiTagMap | |
418 JvmtiTagMap::JvmtiTagMap(JvmtiEnv* env) : | |
419 _env(env), | |
420 _lock(Mutex::nonleaf+2, "JvmtiTagMap._lock", false), | |
421 _free_entries(NULL), | |
422 _free_entries_count(0) | |
423 { | |
424 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
425 assert(((JvmtiEnvBase *)env)->tag_map() == NULL, "tag map already exists for environment"); | |
426 | |
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427 _hashmap = new JvmtiTagHashmap(); |
0 | 428 |
429 // finally add us to the environment | |
430 ((JvmtiEnvBase *)env)->set_tag_map(this); | |
431 } | |
432 | |
433 | |
434 // destroy a JvmtiTagMap | |
435 JvmtiTagMap::~JvmtiTagMap() { | |
436 | |
437 // no lock acquired as we assume the enclosing environment is | |
438 // also being destroryed. | |
439 ((JvmtiEnvBase *)_env)->set_tag_map(NULL); | |
440 | |
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441 JvmtiTagHashmapEntry** table = _hashmap->table(); |
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442 for (int j = 0; j < _hashmap->size(); j++) { |
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443 JvmtiTagHashmapEntry* entry = table[j]; |
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444 while (entry != NULL) { |
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445 JvmtiTagHashmapEntry* next = entry->next(); |
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446 delete entry; |
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447 entry = next; |
0 | 448 } |
449 } | |
450 | |
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451 // finally destroy the hashmap |
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452 delete _hashmap; |
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453 _hashmap = NULL; |
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454 |
0 | 455 // remove any entries on the free list |
456 JvmtiTagHashmapEntry* entry = _free_entries; | |
457 while (entry != NULL) { | |
458 JvmtiTagHashmapEntry* next = entry->next(); | |
459 delete entry; | |
460 entry = next; | |
461 } | |
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462 _free_entries = NULL; |
0 | 463 } |
464 | |
465 // create a hashmap entry | |
466 // - if there's an entry on the (per-environment) free list then this | |
467 // is returned. Otherwise an new entry is allocated. | |
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468 JvmtiTagHashmapEntry* JvmtiTagMap::create_entry(oop ref, jlong tag) { |
0 | 469 assert(Thread::current()->is_VM_thread() || is_locked(), "checking"); |
470 JvmtiTagHashmapEntry* entry; | |
471 if (_free_entries == NULL) { | |
472 entry = new JvmtiTagHashmapEntry(ref, tag); | |
473 } else { | |
474 assert(_free_entries_count > 0, "mismatched _free_entries_count"); | |
475 _free_entries_count--; | |
476 entry = _free_entries; | |
477 _free_entries = entry->next(); | |
478 entry->init(ref, tag); | |
479 } | |
480 return entry; | |
481 } | |
482 | |
483 // destroy an entry by returning it to the free list | |
484 void JvmtiTagMap::destroy_entry(JvmtiTagHashmapEntry* entry) { | |
485 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
486 // limit the size of the free list | |
487 if (_free_entries_count >= max_free_entries) { | |
488 delete entry; | |
489 } else { | |
490 entry->set_next(_free_entries); | |
491 _free_entries = entry; | |
492 _free_entries_count++; | |
493 } | |
494 } | |
495 | |
496 // returns the tag map for the given environments. If the tag map | |
497 // doesn't exist then it is created. | |
498 JvmtiTagMap* JvmtiTagMap::tag_map_for(JvmtiEnv* env) { | |
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499 JvmtiTagMap* tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 500 if (tag_map == NULL) { |
501 MutexLocker mu(JvmtiThreadState_lock); | |
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502 tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 503 if (tag_map == NULL) { |
504 tag_map = new JvmtiTagMap(env); | |
505 } | |
506 } else { | |
507 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
508 } | |
509 return tag_map; | |
510 } | |
511 | |
512 // iterate over all entries in the tag map. | |
513 void JvmtiTagMap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
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514 hashmap()->entry_iterate(closure); |
0 | 515 } |
516 | |
517 // returns true if the hashmaps are empty | |
518 bool JvmtiTagMap::is_empty() { | |
519 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
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520 return hashmap()->entry_count() == 0; |
0 | 521 } |
522 | |
523 | |
524 // Return the tag value for an object, or 0 if the object is | |
525 // not tagged | |
526 // | |
527 static inline jlong tag_for(JvmtiTagMap* tag_map, oop o) { | |
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528 JvmtiTagHashmapEntry* entry = tag_map->hashmap()->find(o); |
0 | 529 if (entry == NULL) { |
530 return 0; | |
531 } else { | |
532 return entry->tag(); | |
533 } | |
534 } | |
535 | |
536 // If the object is a java.lang.Class then return the klassOop, | |
537 // otherwise return the original object | |
538 static inline oop klassOop_if_java_lang_Class(oop o) { | |
1142 | 539 if (o->klass() == SystemDictionary::Class_klass()) { |
0 | 540 if (!java_lang_Class::is_primitive(o)) { |
541 o = (oop)java_lang_Class::as_klassOop(o); | |
542 assert(o != NULL, "class for non-primitive mirror must exist"); | |
543 } | |
544 } | |
545 return o; | |
546 } | |
547 | |
548 // A CallbackWrapper is a support class for querying and tagging an object | |
549 // around a callback to a profiler. The constructor does pre-callback | |
550 // work to get the tag value, klass tag value, ... and the destructor | |
551 // does the post-callback work of tagging or untagging the object. | |
552 // | |
553 // { | |
554 // CallbackWrapper wrapper(tag_map, o); | |
555 // | |
556 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
557 // | |
558 // } // wrapper goes out of scope here which results in the destructor | |
559 // checking to see if the object has been tagged, untagged, or the | |
560 // tag value has changed. | |
561 // | |
562 class CallbackWrapper : public StackObj { | |
563 private: | |
564 JvmtiTagMap* _tag_map; | |
565 JvmtiTagHashmap* _hashmap; | |
566 JvmtiTagHashmapEntry* _entry; | |
567 oop _o; | |
568 jlong _obj_size; | |
569 jlong _obj_tag; | |
570 klassOop _klass; // the object's class | |
571 jlong _klass_tag; | |
572 | |
573 protected: | |
574 JvmtiTagMap* tag_map() const { return _tag_map; } | |
575 | |
576 // invoked post-callback to tag, untag, or update the tag of an object | |
577 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
578 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
579 public: | |
580 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
581 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
582 "MT unsafe or must be VM thread"); | |
583 | |
584 // for Classes the klassOop is tagged | |
585 _o = klassOop_if_java_lang_Class(o); | |
586 | |
587 // object size | |
588 _obj_size = _o->size() * wordSize; | |
589 | |
590 // record the context | |
591 _tag_map = tag_map; | |
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592 _hashmap = tag_map->hashmap(); |
0 | 593 _entry = _hashmap->find(_o); |
594 | |
595 // get object tag | |
596 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
597 | |
598 // get the class and the class's tag value | |
599 if (_o == o) { | |
600 _klass = _o->klass(); | |
601 } else { | |
602 // if the object represents a runtime class then use the | |
603 // tag for java.lang.Class | |
1142 | 604 _klass = SystemDictionary::Class_klass(); |
0 | 605 } |
606 _klass_tag = tag_for(tag_map, _klass); | |
607 } | |
608 | |
609 ~CallbackWrapper() { | |
610 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
611 } | |
612 | |
613 inline jlong* obj_tag_p() { return &_obj_tag; } | |
614 inline jlong obj_size() const { return _obj_size; } | |
615 inline jlong obj_tag() const { return _obj_tag; } | |
616 inline klassOop klass() const { return _klass; } | |
617 inline jlong klass_tag() const { return _klass_tag; } | |
618 }; | |
619 | |
620 | |
621 | |
622 // callback post-callback to tag, untag, or update the tag of an object | |
623 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
624 JvmtiTagHashmap* hashmap, | |
625 JvmtiTagHashmapEntry* entry, | |
626 jlong obj_tag) { | |
627 if (entry == NULL) { | |
628 if (obj_tag != 0) { | |
629 // callback has tagged the object | |
630 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
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631 entry = tag_map()->create_entry(o, obj_tag); |
0 | 632 hashmap->add(o, entry); |
633 } | |
634 } else { | |
635 // object was previously tagged - the callback may have untagged | |
636 // the object or changed the tag value | |
637 if (obj_tag == 0) { | |
638 | |
639 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
640 assert(entry_removed == entry, "checking"); | |
641 tag_map()->destroy_entry(entry); | |
642 | |
643 } else { | |
644 if (obj_tag != entry->tag()) { | |
645 entry->set_tag(obj_tag); | |
646 } | |
647 } | |
648 } | |
649 } | |
650 | |
651 // An extended CallbackWrapper used when reporting an object reference | |
652 // to the agent. | |
653 // | |
654 // { | |
655 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
656 // | |
657 // (*callback)(wrapper.klass_tag(), | |
658 // wrapper.obj_size(), | |
659 // wrapper.obj_tag_p() | |
660 // wrapper.referrer_tag_p(), ...) | |
661 // | |
662 // } // wrapper goes out of scope here which results in the destructor | |
663 // checking to see if the referrer object has been tagged, untagged, | |
664 // or the tag value has changed. | |
665 // | |
666 class TwoOopCallbackWrapper : public CallbackWrapper { | |
667 private: | |
668 bool _is_reference_to_self; | |
669 JvmtiTagHashmap* _referrer_hashmap; | |
670 JvmtiTagHashmapEntry* _referrer_entry; | |
671 oop _referrer; | |
672 jlong _referrer_obj_tag; | |
673 jlong _referrer_klass_tag; | |
674 jlong* _referrer_tag_p; | |
675 | |
676 bool is_reference_to_self() const { return _is_reference_to_self; } | |
677 | |
678 public: | |
679 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
680 CallbackWrapper(tag_map, o) | |
681 { | |
682 // self reference needs to be handled in a special way | |
683 _is_reference_to_self = (referrer == o); | |
684 | |
685 if (_is_reference_to_self) { | |
686 _referrer_klass_tag = klass_tag(); | |
687 _referrer_tag_p = obj_tag_p(); | |
688 } else { | |
689 // for Classes the klassOop is tagged | |
690 _referrer = klassOop_if_java_lang_Class(referrer); | |
691 // record the context | |
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692 _referrer_hashmap = tag_map->hashmap(); |
0 | 693 _referrer_entry = _referrer_hashmap->find(_referrer); |
694 | |
695 // get object tag | |
696 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
697 _referrer_tag_p = &_referrer_obj_tag; | |
698 | |
699 // get referrer class tag. | |
700 klassOop k = (_referrer == referrer) ? // Check if referrer is a class... | |
701 _referrer->klass() // No, just get its class | |
1142 | 702 : SystemDictionary::Class_klass(); // Yes, its class is Class |
0 | 703 _referrer_klass_tag = tag_for(tag_map, k); |
704 } | |
705 } | |
706 | |
707 ~TwoOopCallbackWrapper() { | |
708 if (!is_reference_to_self()){ | |
709 post_callback_tag_update(_referrer, | |
710 _referrer_hashmap, | |
711 _referrer_entry, | |
712 _referrer_obj_tag); | |
713 } | |
714 } | |
715 | |
716 // address of referrer tag | |
717 // (for a self reference this will return the same thing as obj_tag_p()) | |
718 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
719 | |
720 // referrer's class tag | |
721 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
722 }; | |
723 | |
724 // tag an object | |
725 // | |
726 // This function is performance critical. If many threads attempt to tag objects | |
727 // around the same time then it's possible that the Mutex associated with the | |
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728 // tag map will be a hot lock. |
0 | 729 void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
730 MutexLocker ml(lock()); | |
731 | |
732 // resolve the object | |
733 oop o = JNIHandles::resolve_non_null(object); | |
734 | |
735 // for Classes we tag the klassOop | |
736 o = klassOop_if_java_lang_Class(o); | |
737 | |
738 // see if the object is already tagged | |
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739 JvmtiTagHashmap* hashmap = _hashmap; |
0 | 740 JvmtiTagHashmapEntry* entry = hashmap->find(o); |
741 | |
742 // if the object is not already tagged then we tag it | |
743 if (entry == NULL) { | |
744 if (tag != 0) { | |
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745 entry = create_entry(o, tag); |
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746 hashmap->add(o, entry); |
0 | 747 } else { |
748 // no-op | |
749 } | |
750 } else { | |
751 // if the object is already tagged then we either update | |
752 // the tag (if a new tag value has been provided) | |
753 // or remove the object if the new tag value is 0. | |
754 if (tag == 0) { | |
755 hashmap->remove(o); | |
756 destroy_entry(entry); | |
757 } else { | |
758 entry->set_tag(tag); | |
759 } | |
760 } | |
761 } | |
762 | |
763 // get the tag for an object | |
764 jlong JvmtiTagMap::get_tag(jobject object) { | |
765 MutexLocker ml(lock()); | |
766 | |
767 // resolve the object | |
768 oop o = JNIHandles::resolve_non_null(object); | |
769 | |
770 // for Classes get the tag from the klassOop | |
771 return tag_for(this, klassOop_if_java_lang_Class(o)); | |
772 } | |
773 | |
774 | |
775 // Helper class used to describe the static or instance fields of a class. | |
776 // For each field it holds the field index (as defined by the JVMTI specification), | |
777 // the field type, and the offset. | |
778 | |
779 class ClassFieldDescriptor: public CHeapObj { | |
780 private: | |
781 int _field_index; | |
782 int _field_offset; | |
783 char _field_type; | |
784 public: | |
785 ClassFieldDescriptor(int index, char type, int offset) : | |
786 _field_index(index), _field_type(type), _field_offset(offset) { | |
787 } | |
788 int field_index() const { return _field_index; } | |
789 char field_type() const { return _field_type; } | |
790 int field_offset() const { return _field_offset; } | |
791 }; | |
792 | |
793 class ClassFieldMap: public CHeapObj { | |
794 private: | |
795 enum { | |
796 initial_field_count = 5 | |
797 }; | |
798 | |
799 // list of field descriptors | |
800 GrowableArray<ClassFieldDescriptor*>* _fields; | |
801 | |
802 // constructor | |
803 ClassFieldMap(); | |
804 | |
805 // add a field | |
806 void add(int index, char type, int offset); | |
807 | |
808 // returns the field count for the given class | |
809 static int compute_field_count(instanceKlassHandle ikh); | |
810 | |
811 public: | |
812 ~ClassFieldMap(); | |
813 | |
814 // access | |
815 int field_count() { return _fields->length(); } | |
816 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
817 | |
818 // functions to create maps of static or instance fields | |
819 static ClassFieldMap* create_map_of_static_fields(klassOop k); | |
820 static ClassFieldMap* create_map_of_instance_fields(oop obj); | |
821 }; | |
822 | |
823 ClassFieldMap::ClassFieldMap() { | |
824 _fields = new (ResourceObj::C_HEAP) GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
825 } | |
826 | |
827 ClassFieldMap::~ClassFieldMap() { | |
828 for (int i=0; i<_fields->length(); i++) { | |
829 delete _fields->at(i); | |
830 } | |
831 delete _fields; | |
832 } | |
833 | |
834 void ClassFieldMap::add(int index, char type, int offset) { | |
835 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
836 _fields->append(field); | |
837 } | |
838 | |
839 // Returns a heap allocated ClassFieldMap to describe the static fields | |
840 // of the given class. | |
841 // | |
842 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(klassOop k) { | |
843 HandleMark hm; | |
844 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
845 | |
846 // create the field map | |
847 ClassFieldMap* field_map = new ClassFieldMap(); | |
848 | |
849 FilteredFieldStream f(ikh, false, false); | |
850 int max_field_index = f.field_count()-1; | |
851 | |
852 int index = 0; | |
853 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
854 // ignore instance fields | |
855 if (!fld.access_flags().is_static()) { | |
856 continue; | |
857 } | |
858 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
859 } | |
860 return field_map; | |
861 } | |
862 | |
863 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
864 // of the given class. All instance fields are included (this means public | |
865 // and private fields declared in superclasses and superinterfaces too). | |
866 // | |
867 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
868 HandleMark hm; | |
869 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
870 | |
871 // create the field map | |
872 ClassFieldMap* field_map = new ClassFieldMap(); | |
873 | |
874 FilteredFieldStream f(ikh, false, false); | |
875 | |
876 int max_field_index = f.field_count()-1; | |
877 | |
878 int index = 0; | |
879 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
880 // ignore static fields | |
881 if (fld.access_flags().is_static()) { | |
882 continue; | |
883 } | |
884 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
885 } | |
886 | |
887 return field_map; | |
888 } | |
889 | |
890 // Helper class used to cache a ClassFileMap for the instance fields of | |
891 // a cache. A JvmtiCachedClassFieldMap can be cached by an instanceKlass during | |
892 // heap iteration and avoid creating a field map for each object in the heap | |
893 // (only need to create the map when the first instance of a class is encountered). | |
894 // | |
895 class JvmtiCachedClassFieldMap : public CHeapObj { | |
896 private: | |
897 enum { | |
898 initial_class_count = 200 | |
899 }; | |
900 ClassFieldMap* _field_map; | |
901 | |
902 ClassFieldMap* field_map() const { return _field_map; } | |
903 | |
904 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
905 ~JvmtiCachedClassFieldMap(); | |
906 | |
907 static GrowableArray<instanceKlass*>* _class_list; | |
908 static void add_to_class_list(instanceKlass* ik); | |
909 | |
910 public: | |
911 // returns the field map for a given object (returning map cached | |
912 // by instanceKlass if possible | |
913 static ClassFieldMap* get_map_of_instance_fields(oop obj); | |
914 | |
915 // removes the field map from all instanceKlasses - should be | |
916 // called before VM operation completes | |
917 static void clear_cache(); | |
918 | |
919 // returns the number of ClassFieldMap cached by instanceKlasses | |
920 static int cached_field_map_count(); | |
921 }; | |
922 | |
923 GrowableArray<instanceKlass*>* JvmtiCachedClassFieldMap::_class_list; | |
924 | |
925 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
926 _field_map = field_map; | |
927 } | |
928 | |
929 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
930 if (_field_map != NULL) { | |
931 delete _field_map; | |
932 } | |
933 } | |
934 | |
935 // Marker class to ensure that the class file map cache is only used in a defined | |
936 // scope. | |
937 class ClassFieldMapCacheMark : public StackObj { | |
938 private: | |
939 static bool _is_active; | |
940 public: | |
941 ClassFieldMapCacheMark() { | |
942 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
943 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
944 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
945 _is_active = true; | |
946 } | |
947 ~ClassFieldMapCacheMark() { | |
948 JvmtiCachedClassFieldMap::clear_cache(); | |
949 _is_active = false; | |
950 } | |
951 static bool is_active() { return _is_active; } | |
952 }; | |
953 | |
954 bool ClassFieldMapCacheMark::_is_active; | |
955 | |
956 | |
957 // record that the given instanceKlass is caching a field map | |
958 void JvmtiCachedClassFieldMap::add_to_class_list(instanceKlass* ik) { | |
959 if (_class_list == NULL) { | |
960 _class_list = new (ResourceObj::C_HEAP) GrowableArray<instanceKlass*>(initial_class_count, true); | |
961 } | |
962 _class_list->push(ik); | |
963 } | |
964 | |
965 // returns the instance field map for the given object | |
966 // (returns field map cached by the instanceKlass if possible) | |
967 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { | |
968 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
969 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
970 | |
971 klassOop k = obj->klass(); | |
972 instanceKlass* ik = instanceKlass::cast(k); | |
973 | |
974 // return cached map if possible | |
975 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
976 if (cached_map != NULL) { | |
977 assert(cached_map->field_map() != NULL, "missing field list"); | |
978 return cached_map->field_map(); | |
979 } else { | |
980 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
981 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
982 ik->set_jvmti_cached_class_field_map(cached_map); | |
983 add_to_class_list(ik); | |
984 return field_map; | |
985 } | |
986 } | |
987 | |
988 // remove the fields maps cached from all instanceKlasses | |
989 void JvmtiCachedClassFieldMap::clear_cache() { | |
990 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
991 if (_class_list != NULL) { | |
992 for (int i = 0; i < _class_list->length(); i++) { | |
993 instanceKlass* ik = _class_list->at(i); | |
994 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
995 assert(cached_map != NULL, "should not be NULL"); | |
996 ik->set_jvmti_cached_class_field_map(NULL); | |
997 delete cached_map; // deletes the encapsulated field map | |
998 } | |
999 delete _class_list; | |
1000 _class_list = NULL; | |
1001 } | |
1002 } | |
1003 | |
1004 // returns the number of ClassFieldMap cached by instanceKlasses | |
1005 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
1006 return (_class_list == NULL) ? 0 : _class_list->length(); | |
1007 } | |
1008 | |
1009 // helper function to indicate if an object is filtered by its tag or class tag | |
1010 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
1011 jlong klass_tag, | |
1012 int heap_filter) { | |
1013 // apply the heap filter | |
1014 if (obj_tag != 0) { | |
1015 // filter out tagged objects | |
1016 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
1017 } else { | |
1018 // filter out untagged objects | |
1019 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
1020 } | |
1021 if (klass_tag != 0) { | |
1022 // filter out objects with tagged classes | |
1023 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
1024 } else { | |
1025 // filter out objects with untagged classes. | |
1026 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
1027 } | |
1028 return false; | |
1029 } | |
1030 | |
1031 // helper function to indicate if an object is filtered by a klass filter | |
1032 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
1033 if (!klass_filter.is_null()) { | |
1034 if (obj->klass() != klass_filter()) { | |
1035 return true; | |
1036 } | |
1037 } | |
1038 return false; | |
1039 } | |
1040 | |
1041 // helper function to tell if a field is a primitive field or not | |
1042 static inline bool is_primitive_field_type(char type) { | |
1043 return (type != 'L' && type != '['); | |
1044 } | |
1045 | |
1046 // helper function to copy the value from location addr to jvalue. | |
1047 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
1048 switch (value_type) { | |
1049 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
1050 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
1051 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
1052 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
1053 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
1054 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
1055 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
1056 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
1057 default: ShouldNotReachHere(); | |
1058 } | |
1059 } | |
1060 | |
1061 // helper function to invoke string primitive value callback | |
1062 // returns visit control flags | |
1063 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
1064 CallbackWrapper* wrapper, | |
1065 oop str, | |
1066 void* user_data) | |
1067 { | |
1142 | 1068 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 1069 |
1070 // get the string value and length | |
1071 // (string value may be offset from the base) | |
1072 int s_len = java_lang_String::length(str); | |
1073 typeArrayOop s_value = java_lang_String::value(str); | |
1074 int s_offset = java_lang_String::offset(str); | |
1075 jchar* value; | |
1076 if (s_len > 0) { | |
1077 value = s_value->char_at_addr(s_offset); | |
1078 } else { | |
1079 value = (jchar*) s_value->base(T_CHAR); | |
1080 } | |
1081 | |
1082 // invoke the callback | |
1083 return (*cb)(wrapper->klass_tag(), | |
1084 wrapper->obj_size(), | |
1085 wrapper->obj_tag_p(), | |
1086 value, | |
1087 (jint)s_len, | |
1088 user_data); | |
1089 } | |
1090 | |
1091 // helper function to invoke string primitive value callback | |
1092 // returns visit control flags | |
1093 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
1094 CallbackWrapper* wrapper, | |
1095 oop obj, | |
1096 void* user_data) | |
1097 { | |
1098 assert(obj->is_typeArray(), "not a primitive array"); | |
1099 | |
1100 // get base address of first element | |
1101 typeArrayOop array = typeArrayOop(obj); | |
1102 BasicType type = typeArrayKlass::cast(array->klass())->element_type(); | |
1103 void* elements = array->base(type); | |
1104 | |
1105 // jvmtiPrimitiveType is defined so this mapping is always correct | |
1106 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
1107 | |
1108 return (*cb)(wrapper->klass_tag(), | |
1109 wrapper->obj_size(), | |
1110 wrapper->obj_tag_p(), | |
1111 (jint)array->length(), | |
1112 elem_type, | |
1113 elements, | |
1114 user_data); | |
1115 } | |
1116 | |
1117 // helper function to invoke the primitive field callback for all static fields | |
1118 // of a given class | |
1119 static jint invoke_primitive_field_callback_for_static_fields | |
1120 (CallbackWrapper* wrapper, | |
1121 oop obj, | |
1122 jvmtiPrimitiveFieldCallback cb, | |
1123 void* user_data) | |
1124 { | |
1125 // for static fields only the index will be set | |
1126 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1127 | |
1142 | 1128 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
0 | 1129 if (java_lang_Class::is_primitive(obj)) { |
1130 return 0; | |
1131 } | |
1132 klassOop k = java_lang_Class::as_klassOop(obj); | |
1133 Klass* klass = k->klass_part(); | |
1134 | |
1135 // ignore classes for object and type arrays | |
1136 if (!klass->oop_is_instance()) { | |
1137 return 0; | |
1138 } | |
1139 | |
1140 // ignore classes which aren't linked yet | |
1141 instanceKlass* ik = instanceKlass::cast(k); | |
1142 if (!ik->is_linked()) { | |
1143 return 0; | |
1144 } | |
1145 | |
1146 // get the field map | |
1147 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
1148 | |
1149 // invoke the callback for each static primitive field | |
1150 for (int i=0; i<field_map->field_count(); i++) { | |
1151 ClassFieldDescriptor* field = field_map->field_at(i); | |
1152 | |
1153 // ignore non-primitive fields | |
1154 char type = field->field_type(); | |
1155 if (!is_primitive_field_type(type)) { | |
1156 continue; | |
1157 } | |
1158 // one-to-one mapping | |
1159 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1160 | |
1161 // get offset and field value | |
1162 int offset = field->field_offset(); | |
1163 address addr = (address)k + offset; | |
1164 jvalue value; | |
1165 copy_to_jvalue(&value, addr, value_type); | |
1166 | |
1167 // field index | |
1168 reference_info.field.index = field->field_index(); | |
1169 | |
1170 // invoke the callback | |
1171 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
1172 &reference_info, | |
1173 wrapper->klass_tag(), | |
1174 wrapper->obj_tag_p(), | |
1175 value, | |
1176 value_type, | |
1177 user_data); | |
1178 if (res & JVMTI_VISIT_ABORT) { | |
1179 delete field_map; | |
1180 return res; | |
1181 } | |
1182 } | |
1183 | |
1184 delete field_map; | |
1185 return 0; | |
1186 } | |
1187 | |
1188 // helper function to invoke the primitive field callback for all instance fields | |
1189 // of a given object | |
1190 static jint invoke_primitive_field_callback_for_instance_fields( | |
1191 CallbackWrapper* wrapper, | |
1192 oop obj, | |
1193 jvmtiPrimitiveFieldCallback cb, | |
1194 void* user_data) | |
1195 { | |
1196 // for instance fields only the index will be set | |
1197 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1198 | |
1199 // get the map of the instance fields | |
1200 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
1201 | |
1202 // invoke the callback for each instance primitive field | |
1203 for (int i=0; i<fields->field_count(); i++) { | |
1204 ClassFieldDescriptor* field = fields->field_at(i); | |
1205 | |
1206 // ignore non-primitive fields | |
1207 char type = field->field_type(); | |
1208 if (!is_primitive_field_type(type)) { | |
1209 continue; | |
1210 } | |
1211 // one-to-one mapping | |
1212 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1213 | |
1214 // get offset and field value | |
1215 int offset = field->field_offset(); | |
1216 address addr = (address)obj + offset; | |
1217 jvalue value; | |
1218 copy_to_jvalue(&value, addr, value_type); | |
1219 | |
1220 // field index | |
1221 reference_info.field.index = field->field_index(); | |
1222 | |
1223 // invoke the callback | |
1224 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
1225 &reference_info, | |
1226 wrapper->klass_tag(), | |
1227 wrapper->obj_tag_p(), | |
1228 value, | |
1229 value_type, | |
1230 user_data); | |
1231 if (res & JVMTI_VISIT_ABORT) { | |
1232 return res; | |
1233 } | |
1234 } | |
1235 return 0; | |
1236 } | |
1237 | |
1238 | |
1239 // VM operation to iterate over all objects in the heap (both reachable | |
1240 // and unreachable) | |
1241 class VM_HeapIterateOperation: public VM_Operation { | |
1242 private: | |
1243 ObjectClosure* _blk; | |
1244 public: | |
1245 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
1246 | |
1247 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
1248 void doit() { | |
1249 // allows class files maps to be cached during iteration | |
1250 ClassFieldMapCacheMark cm; | |
1251 | |
1252 // make sure that heap is parsable (fills TLABs with filler objects) | |
1253 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1254 | |
1255 // Verify heap before iteration - if the heap gets corrupted then | |
1256 // JVMTI's IterateOverHeap will crash. | |
1257 if (VerifyBeforeIteration) { | |
1258 Universe::verify(); | |
1259 } | |
1260 | |
1261 // do the iteration | |
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1262 // If this operation encounters a bad object when using CMS, |
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1263 // consider using safe_object_iterate() which avoids perm gen |
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1264 // objects that may contain bad references. |
0 | 1265 Universe::heap()->object_iterate(_blk); |
1266 | |
1267 // when sharing is enabled we must iterate over the shared spaces | |
1268 if (UseSharedSpaces) { | |
1269 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1270 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
1271 gen->ro_space()->object_iterate(_blk); | |
1272 gen->rw_space()->object_iterate(_blk); | |
1273 } | |
1274 } | |
1275 | |
1276 }; | |
1277 | |
1278 | |
1279 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
1280 // IterateOverInstancesOfClass functions | |
1281 class IterateOverHeapObjectClosure: public ObjectClosure { | |
1282 private: | |
1283 JvmtiTagMap* _tag_map; | |
1284 KlassHandle _klass; | |
1285 jvmtiHeapObjectFilter _object_filter; | |
1286 jvmtiHeapObjectCallback _heap_object_callback; | |
1287 const void* _user_data; | |
1288 | |
1289 // accessors | |
1290 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1291 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
1292 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
1293 KlassHandle klass() const { return _klass; } | |
1294 const void* user_data() const { return _user_data; } | |
1295 | |
1296 // indicates if iteration has been aborted | |
1297 bool _iteration_aborted; | |
1298 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1299 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
1300 | |
1301 public: | |
1302 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
1303 KlassHandle klass, | |
1304 jvmtiHeapObjectFilter object_filter, | |
1305 jvmtiHeapObjectCallback heap_object_callback, | |
1306 const void* user_data) : | |
1307 _tag_map(tag_map), | |
1308 _klass(klass), | |
1309 _object_filter(object_filter), | |
1310 _heap_object_callback(heap_object_callback), | |
1311 _user_data(user_data), | |
1312 _iteration_aborted(false) | |
1313 { | |
1314 } | |
1315 | |
1316 void do_object(oop o); | |
1317 }; | |
1318 | |
1319 // invoked for each object in the heap | |
1320 void IterateOverHeapObjectClosure::do_object(oop o) { | |
1321 // check if iteration has been halted | |
1322 if (is_iteration_aborted()) return; | |
1323 | |
1324 // ignore any objects that aren't visible to profiler | |
1325 if (!ServiceUtil::visible_oop(o)) return; | |
1326 | |
1327 // instanceof check when filtering by klass | |
1328 if (!klass().is_null() && !o->is_a(klass()())) { | |
1329 return; | |
1330 } | |
1331 // prepare for the calllback | |
1332 CallbackWrapper wrapper(tag_map(), o); | |
1333 | |
1334 // if the object is tagged and we're only interested in untagged objects | |
1335 // then don't invoke the callback. Similiarly, if the object is untagged | |
1336 // and we're only interested in tagged objects we skip the callback. | |
1337 if (wrapper.obj_tag() != 0) { | |
1338 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
1339 } else { | |
1340 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
1341 } | |
1342 | |
1343 // invoke the agent's callback | |
1344 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
1345 wrapper.obj_size(), | |
1346 wrapper.obj_tag_p(), | |
1347 (void*)user_data()); | |
1348 if (control == JVMTI_ITERATION_ABORT) { | |
1349 set_iteration_aborted(true); | |
1350 } | |
1351 } | |
1352 | |
1353 // An ObjectClosure used to support the IterateThroughHeap function | |
1354 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
1355 private: | |
1356 JvmtiTagMap* _tag_map; | |
1357 KlassHandle _klass; | |
1358 int _heap_filter; | |
1359 const jvmtiHeapCallbacks* _callbacks; | |
1360 const void* _user_data; | |
1361 | |
1362 // accessor functions | |
1363 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1364 int heap_filter() const { return _heap_filter; } | |
1365 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
1366 KlassHandle klass() const { return _klass; } | |
1367 const void* user_data() const { return _user_data; } | |
1368 | |
1369 // indicates if the iteration has been aborted | |
1370 bool _iteration_aborted; | |
1371 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1372 | |
1373 // used to check the visit control flags. If the abort flag is set | |
1374 // then we set the iteration aborted flag so that the iteration completes | |
1375 // without processing any further objects | |
1376 bool check_flags_for_abort(jint flags) { | |
1377 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
1378 if (is_abort) { | |
1379 _iteration_aborted = true; | |
1380 } | |
1381 return is_abort; | |
1382 } | |
1383 | |
1384 public: | |
1385 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
1386 KlassHandle klass, | |
1387 int heap_filter, | |
1388 const jvmtiHeapCallbacks* heap_callbacks, | |
1389 const void* user_data) : | |
1390 _tag_map(tag_map), | |
1391 _klass(klass), | |
1392 _heap_filter(heap_filter), | |
1393 _callbacks(heap_callbacks), | |
1394 _user_data(user_data), | |
1395 _iteration_aborted(false) | |
1396 { | |
1397 } | |
1398 | |
1399 void do_object(oop o); | |
1400 }; | |
1401 | |
1402 // invoked for each object in the heap | |
1403 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
1404 // check if iteration has been halted | |
1405 if (is_iteration_aborted()) return; | |
1406 | |
1407 // ignore any objects that aren't visible to profiler | |
1408 if (!ServiceUtil::visible_oop(obj)) return; | |
1409 | |
1410 // apply class filter | |
1411 if (is_filtered_by_klass_filter(obj, klass())) return; | |
1412 | |
1413 // prepare for callback | |
1414 CallbackWrapper wrapper(tag_map(), obj); | |
1415 | |
1416 // check if filtered by the heap filter | |
1417 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
1418 return; | |
1419 } | |
1420 | |
1421 // for arrays we need the length, otherwise -1 | |
1422 bool is_array = obj->is_array(); | |
1423 int len = is_array ? arrayOop(obj)->length() : -1; | |
1424 | |
1425 // invoke the object callback (if callback is provided) | |
1426 if (callbacks()->heap_iteration_callback != NULL) { | |
1427 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
1428 jint res = (*cb)(wrapper.klass_tag(), | |
1429 wrapper.obj_size(), | |
1430 wrapper.obj_tag_p(), | |
1431 (jint)len, | |
1432 (void*)user_data()); | |
1433 if (check_flags_for_abort(res)) return; | |
1434 } | |
1435 | |
1436 // for objects and classes we report primitive fields if callback provided | |
1437 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
1438 jint res; | |
1439 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
1142 | 1440 if (obj->klass() == SystemDictionary::Class_klass()) { |
0 | 1441 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
1442 obj, | |
1443 cb, | |
1444 (void*)user_data()); | |
1445 } else { | |
1446 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
1447 obj, | |
1448 cb, | |
1449 (void*)user_data()); | |
1450 } | |
1451 if (check_flags_for_abort(res)) return; | |
1452 } | |
1453 | |
1454 // string callback | |
1455 if (!is_array && | |
1456 callbacks()->string_primitive_value_callback != NULL && | |
1142 | 1457 obj->klass() == SystemDictionary::String_klass()) { |
0 | 1458 jint res = invoke_string_value_callback( |
1459 callbacks()->string_primitive_value_callback, | |
1460 &wrapper, | |
1461 obj, | |
1462 (void*)user_data() ); | |
1463 if (check_flags_for_abort(res)) return; | |
1464 } | |
1465 | |
1466 // array callback | |
1467 if (is_array && | |
1468 callbacks()->array_primitive_value_callback != NULL && | |
1469 obj->is_typeArray()) { | |
1470 jint res = invoke_array_primitive_value_callback( | |
1471 callbacks()->array_primitive_value_callback, | |
1472 &wrapper, | |
1473 obj, | |
1474 (void*)user_data() ); | |
1475 if (check_flags_for_abort(res)) return; | |
1476 } | |
1477 }; | |
1478 | |
1479 | |
1480 // Deprecated function to iterate over all objects in the heap | |
1481 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
1482 KlassHandle klass, | |
1483 jvmtiHeapObjectCallback heap_object_callback, | |
1484 const void* user_data) | |
1485 { | |
1486 MutexLocker ml(Heap_lock); | |
1487 IterateOverHeapObjectClosure blk(this, | |
1488 klass, | |
1489 object_filter, | |
1490 heap_object_callback, | |
1491 user_data); | |
1492 VM_HeapIterateOperation op(&blk); | |
1493 VMThread::execute(&op); | |
1494 } | |
1495 | |
1496 | |
1497 // Iterates over all objects in the heap | |
1498 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
1499 KlassHandle klass, | |
1500 const jvmtiHeapCallbacks* callbacks, | |
1501 const void* user_data) | |
1502 { | |
1503 MutexLocker ml(Heap_lock); | |
1504 IterateThroughHeapObjectClosure blk(this, | |
1505 klass, | |
1506 heap_filter, | |
1507 callbacks, | |
1508 user_data); | |
1509 VM_HeapIterateOperation op(&blk); | |
1510 VMThread::execute(&op); | |
1511 } | |
1512 | |
1513 // support class for get_objects_with_tags | |
1514 | |
1515 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
1516 private: | |
1517 JvmtiEnv* _env; | |
1518 jlong* _tags; | |
1519 jint _tag_count; | |
1520 | |
1521 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
1522 GrowableArray<uint64_t>* _tag_results; // collected tags | |
1523 | |
1524 public: | |
1525 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
1526 _env = env; | |
1527 _tags = (jlong*)tags; | |
1528 _tag_count = tag_count; | |
1529 _object_results = new (ResourceObj::C_HEAP) GrowableArray<jobject>(1,true); | |
1530 _tag_results = new (ResourceObj::C_HEAP) GrowableArray<uint64_t>(1,true); | |
1531 } | |
1532 | |
1533 ~TagObjectCollector() { | |
1534 delete _object_results; | |
1535 delete _tag_results; | |
1536 } | |
1537 | |
1538 // for each tagged object check if the tag value matches | |
1539 // - if it matches then we create a JNI local reference to the object | |
1540 // and record the reference and tag value. | |
1541 // | |
1542 void do_entry(JvmtiTagHashmapEntry* entry) { | |
1543 for (int i=0; i<_tag_count; i++) { | |
1544 if (_tags[i] == entry->tag()) { | |
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1545 oop o = entry->object(); |
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1546 assert(o != NULL, "sanity check"); |
0 | 1547 |
1548 // the mirror is tagged | |
1549 if (o->is_klass()) { | |
1550 klassOop k = (klassOop)o; | |
1551 o = Klass::cast(k)->java_mirror(); | |
1552 } | |
1553 | |
1554 jobject ref = JNIHandles::make_local(JavaThread::current(), o); | |
1555 _object_results->append(ref); | |
1556 _tag_results->append((uint64_t)entry->tag()); | |
1557 } | |
1558 } | |
1559 } | |
1560 | |
1561 // return the results from the collection | |
1562 // | |
1563 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1564 jvmtiError error; | |
1565 int count = _object_results->length(); | |
1566 assert(count >= 0, "sanity check"); | |
1567 | |
1568 // if object_result_ptr is not NULL then allocate the result and copy | |
1569 // in the object references. | |
1570 if (object_result_ptr != NULL) { | |
1571 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
1572 if (error != JVMTI_ERROR_NONE) { | |
1573 return error; | |
1574 } | |
1575 for (int i=0; i<count; i++) { | |
1576 (*object_result_ptr)[i] = _object_results->at(i); | |
1577 } | |
1578 } | |
1579 | |
1580 // if tag_result_ptr is not NULL then allocate the result and copy | |
1581 // in the tag values. | |
1582 if (tag_result_ptr != NULL) { | |
1583 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
1584 if (error != JVMTI_ERROR_NONE) { | |
1585 if (object_result_ptr != NULL) { | |
1586 _env->Deallocate((unsigned char*)object_result_ptr); | |
1587 } | |
1588 return error; | |
1589 } | |
1590 for (int i=0; i<count; i++) { | |
1591 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
1592 } | |
1593 } | |
1594 | |
1595 *count_ptr = count; | |
1596 return JVMTI_ERROR_NONE; | |
1597 } | |
1598 }; | |
1599 | |
1600 // return the list of objects with the specified tags | |
1601 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
1602 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1603 | |
1604 TagObjectCollector collector(env(), tags, count); | |
1605 { | |
1606 // iterate over all tagged objects | |
1607 MutexLocker ml(lock()); | |
1608 entry_iterate(&collector); | |
1609 } | |
1610 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
1611 } | |
1612 | |
1613 | |
1614 // ObjectMarker is used to support the marking objects when walking the | |
1615 // heap. | |
1616 // | |
1617 // This implementation uses the existing mark bits in an object for | |
1618 // marking. Objects that are marked must later have their headers restored. | |
1619 // As most objects are unlocked and don't have their identity hash computed | |
1620 // we don't have to save their headers. Instead we save the headers that | |
1621 // are "interesting". Later when the headers are restored this implementation | |
1622 // restores all headers to their initial value and then restores the few | |
1623 // objects that had interesting headers. | |
1624 // | |
1625 // Future work: This implementation currently uses growable arrays to save | |
1626 // the oop and header of interesting objects. As an optimization we could | |
1627 // use the same technique as the GC and make use of the unused area | |
1628 // between top() and end(). | |
1629 // | |
1630 | |
1631 // An ObjectClosure used to restore the mark bits of an object | |
1632 class RestoreMarksClosure : public ObjectClosure { | |
1633 public: | |
1634 void do_object(oop o) { | |
1635 if (o != NULL) { | |
1636 markOop mark = o->mark(); | |
1637 if (mark->is_marked()) { | |
1638 o->init_mark(); | |
1639 } | |
1640 } | |
1641 } | |
1642 }; | |
1643 | |
1644 // ObjectMarker provides the mark and visited functions | |
1645 class ObjectMarker : AllStatic { | |
1646 private: | |
1647 // saved headers | |
1648 static GrowableArray<oop>* _saved_oop_stack; | |
1649 static GrowableArray<markOop>* _saved_mark_stack; | |
3815 | 1650 static bool _needs_reset; // do we need to reset mark bits? |
0 | 1651 |
1652 public: | |
1653 static void init(); // initialize | |
1654 static void done(); // clean-up | |
1655 | |
1656 static inline void mark(oop o); // mark an object | |
1657 static inline bool visited(oop o); // check if object has been visited | |
3815 | 1658 |
1659 static inline bool needs_reset() { return _needs_reset; } | |
1660 static inline void set_needs_reset(bool v) { _needs_reset = v; } | |
0 | 1661 }; |
1662 | |
1663 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
1664 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
3815 | 1665 bool ObjectMarker::_needs_reset = true; // need to reset mark bits by default |
0 | 1666 |
1667 // initialize ObjectMarker - prepares for object marking | |
1668 void ObjectMarker::init() { | |
1669 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
1670 | |
1671 // prepare heap for iteration | |
1672 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1673 | |
1674 // create stacks for interesting headers | |
1675 _saved_mark_stack = new (ResourceObj::C_HEAP) GrowableArray<markOop>(4000, true); | |
1676 _saved_oop_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(4000, true); | |
1677 | |
1678 if (UseBiasedLocking) { | |
1679 BiasedLocking::preserve_marks(); | |
1680 } | |
1681 } | |
1682 | |
1683 // Object marking is done so restore object headers | |
1684 void ObjectMarker::done() { | |
1685 // iterate over all objects and restore the mark bits to | |
1686 // their initial value | |
1687 RestoreMarksClosure blk; | |
3815 | 1688 if (needs_reset()) { |
1689 Universe::heap()->object_iterate(&blk); | |
1690 } else { | |
1691 // We don't need to reset mark bits on this call, but reset the | |
1692 // flag to the default for the next call. | |
1693 set_needs_reset(true); | |
1694 } | |
0 | 1695 |
1696 // When sharing is enabled we need to restore the headers of the objects | |
1697 // in the readwrite space too. | |
1698 if (UseSharedSpaces) { | |
1699 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1700 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
1701 gen->rw_space()->object_iterate(&blk); | |
1702 } | |
1703 | |
1704 // now restore the interesting headers | |
1705 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
1706 oop o = _saved_oop_stack->at(i); | |
1707 markOop mark = _saved_mark_stack->at(i); | |
1708 o->set_mark(mark); | |
1709 } | |
1710 | |
1711 if (UseBiasedLocking) { | |
1712 BiasedLocking::restore_marks(); | |
1713 } | |
1714 | |
1715 // free the stacks | |
1716 delete _saved_oop_stack; | |
1717 delete _saved_mark_stack; | |
1718 } | |
1719 | |
1720 // mark an object | |
1721 inline void ObjectMarker::mark(oop o) { | |
1722 assert(Universe::heap()->is_in(o), "sanity check"); | |
1723 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
1724 | |
1725 // object's mark word | |
1726 markOop mark = o->mark(); | |
1727 | |
1728 if (mark->must_be_preserved(o)) { | |
1729 _saved_mark_stack->push(mark); | |
1730 _saved_oop_stack->push(o); | |
1731 } | |
1732 | |
1733 // mark the object | |
1734 o->set_mark(markOopDesc::prototype()->set_marked()); | |
1735 } | |
1736 | |
1737 // return true if object is marked | |
1738 inline bool ObjectMarker::visited(oop o) { | |
1739 return o->mark()->is_marked(); | |
1740 } | |
1741 | |
1742 // Stack allocated class to help ensure that ObjectMarker is used | |
1743 // correctly. Constructor initializes ObjectMarker, destructor calls | |
1744 // ObjectMarker's done() function to restore object headers. | |
1745 class ObjectMarkerController : public StackObj { | |
1746 public: | |
1747 ObjectMarkerController() { | |
1748 ObjectMarker::init(); | |
1749 } | |
1750 ~ObjectMarkerController() { | |
1751 ObjectMarker::done(); | |
1752 } | |
1753 }; | |
1754 | |
1755 | |
1756 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
1757 // (not performance critical as only used for roots) | |
1758 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
1759 switch (kind) { | |
1760 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
1761 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
1762 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
1763 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
1764 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
1765 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
1766 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
1767 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
1768 } | |
1769 } | |
1770 | |
1771 // Base class for all heap walk contexts. The base class maintains a flag | |
1772 // to indicate if the context is valid or not. | |
1773 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
1774 private: | |
1775 bool _valid; | |
1776 public: | |
1777 HeapWalkContext(bool valid) { _valid = valid; } | |
1778 void invalidate() { _valid = false; } | |
1779 bool is_valid() const { return _valid; } | |
1780 }; | |
1781 | |
1782 // A basic heap walk context for the deprecated heap walking functions. | |
1783 // The context for a basic heap walk are the callbacks and fields used by | |
1784 // the referrer caching scheme. | |
1785 class BasicHeapWalkContext: public HeapWalkContext { | |
1786 private: | |
1787 jvmtiHeapRootCallback _heap_root_callback; | |
1788 jvmtiStackReferenceCallback _stack_ref_callback; | |
1789 jvmtiObjectReferenceCallback _object_ref_callback; | |
1790 | |
1791 // used for caching | |
1792 oop _last_referrer; | |
1793 jlong _last_referrer_tag; | |
1794 | |
1795 public: | |
1796 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
1797 | |
1798 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
1799 jvmtiStackReferenceCallback stack_ref_callback, | |
1800 jvmtiObjectReferenceCallback object_ref_callback) : | |
1801 HeapWalkContext(true), | |
1802 _heap_root_callback(heap_root_callback), | |
1803 _stack_ref_callback(stack_ref_callback), | |
1804 _object_ref_callback(object_ref_callback), | |
1805 _last_referrer(NULL), | |
1806 _last_referrer_tag(0) { | |
1807 } | |
1808 | |
1809 // accessors | |
1810 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
1811 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
1812 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
1813 | |
1814 oop last_referrer() const { return _last_referrer; } | |
1815 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
1816 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
1817 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
1818 }; | |
1819 | |
1820 // The advanced heap walk context for the FollowReferences functions. | |
1821 // The context is the callbacks, and the fields used for filtering. | |
1822 class AdvancedHeapWalkContext: public HeapWalkContext { | |
1823 private: | |
1824 jint _heap_filter; | |
1825 KlassHandle _klass_filter; | |
1826 const jvmtiHeapCallbacks* _heap_callbacks; | |
1827 | |
1828 public: | |
1829 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
1830 | |
1831 AdvancedHeapWalkContext(jint heap_filter, | |
1832 KlassHandle klass_filter, | |
1833 const jvmtiHeapCallbacks* heap_callbacks) : | |
1834 HeapWalkContext(true), | |
1835 _heap_filter(heap_filter), | |
1836 _klass_filter(klass_filter), | |
1837 _heap_callbacks(heap_callbacks) { | |
1838 } | |
1839 | |
1840 // accessors | |
1841 jint heap_filter() const { return _heap_filter; } | |
1842 KlassHandle klass_filter() const { return _klass_filter; } | |
1843 | |
1844 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
1845 return _heap_callbacks->heap_reference_callback; | |
1846 }; | |
1847 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
1848 return _heap_callbacks->primitive_field_callback; | |
1849 } | |
1850 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
1851 return _heap_callbacks->array_primitive_value_callback; | |
1852 } | |
1853 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
1854 return _heap_callbacks->string_primitive_value_callback; | |
1855 } | |
1856 }; | |
1857 | |
1858 // The CallbackInvoker is a class with static functions that the heap walk can call | |
1859 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
1860 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
1861 // mode is for the newer FollowReferences function which supports a lot of | |
1862 // additional callbacks. | |
1863 class CallbackInvoker : AllStatic { | |
1864 private: | |
1865 // heap walk styles | |
1866 enum { basic, advanced }; | |
1867 static int _heap_walk_type; | |
1868 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
1869 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
1870 | |
1871 // context for basic style heap walk | |
1872 static BasicHeapWalkContext _basic_context; | |
1873 static BasicHeapWalkContext* basic_context() { | |
1874 assert(_basic_context.is_valid(), "invalid"); | |
1875 return &_basic_context; | |
1876 } | |
1877 | |
1878 // context for advanced style heap walk | |
1879 static AdvancedHeapWalkContext _advanced_context; | |
1880 static AdvancedHeapWalkContext* advanced_context() { | |
1881 assert(_advanced_context.is_valid(), "invalid"); | |
1882 return &_advanced_context; | |
1883 } | |
1884 | |
1885 // context needed for all heap walks | |
1886 static JvmtiTagMap* _tag_map; | |
1887 static const void* _user_data; | |
1888 static GrowableArray<oop>* _visit_stack; | |
1889 | |
1890 // accessors | |
1891 static JvmtiTagMap* tag_map() { return _tag_map; } | |
1892 static const void* user_data() { return _user_data; } | |
1893 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
1894 | |
1895 // if the object hasn't been visited then push it onto the visit stack | |
1896 // so that it will be visited later | |
1897 static inline bool check_for_visit(oop obj) { | |
1898 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
1899 return true; | |
1900 } | |
1901 | |
1902 // invoke basic style callbacks | |
1903 static inline bool invoke_basic_heap_root_callback | |
1904 (jvmtiHeapRootKind root_kind, oop obj); | |
1905 static inline bool invoke_basic_stack_ref_callback | |
1906 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
1907 int slot, oop obj); | |
1908 static inline bool invoke_basic_object_reference_callback | |
1909 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1910 | |
1911 // invoke advanced style callbacks | |
1912 static inline bool invoke_advanced_heap_root_callback | |
1913 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
1914 static inline bool invoke_advanced_stack_ref_callback | |
1915 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
1916 jmethodID method, jlocation bci, jint slot, oop obj); | |
1917 static inline bool invoke_advanced_object_reference_callback | |
1918 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1919 | |
1920 // used to report the value of primitive fields | |
1921 static inline bool report_primitive_field | |
1922 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
1923 | |
1924 public: | |
1925 // initialize for basic mode | |
1926 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1927 GrowableArray<oop>* visit_stack, | |
1928 const void* user_data, | |
1929 BasicHeapWalkContext context); | |
1930 | |
1931 // initialize for advanced mode | |
1932 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1933 GrowableArray<oop>* visit_stack, | |
1934 const void* user_data, | |
1935 AdvancedHeapWalkContext context); | |
1936 | |
1937 // functions to report roots | |
1938 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
1939 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
1940 jmethodID m, oop o); | |
1941 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
1942 jmethodID method, jlocation bci, jint slot, oop o); | |
1943 | |
1944 // functions to report references | |
1945 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
1946 static inline bool report_class_reference(oop referrer, oop referree); | |
1947 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
1948 static inline bool report_signers_reference(oop referrer, oop referree); | |
1949 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
1950 static inline bool report_superclass_reference(oop referrer, oop referree); | |
1951 static inline bool report_interface_reference(oop referrer, oop referree); | |
1952 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
1953 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
1954 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
1955 static inline bool report_primitive_array_values(oop array); | |
1956 static inline bool report_string_value(oop str); | |
1957 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
1958 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
1959 }; | |
1960 | |
1961 // statics | |
1962 int CallbackInvoker::_heap_walk_type; | |
1963 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
1964 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
1965 JvmtiTagMap* CallbackInvoker::_tag_map; | |
1966 const void* CallbackInvoker::_user_data; | |
1967 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
1968 | |
1969 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
1970 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1971 GrowableArray<oop>* visit_stack, | |
1972 const void* user_data, | |
1973 BasicHeapWalkContext context) { | |
1974 _tag_map = tag_map; | |
1975 _visit_stack = visit_stack; | |
1976 _user_data = user_data; | |
1977 _basic_context = context; | |
1978 _advanced_context.invalidate(); // will trigger assertion if used | |
1979 _heap_walk_type = basic; | |
1980 } | |
1981 | |
1982 // initialize for advanced heap walk (FollowReferences) | |
1983 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1984 GrowableArray<oop>* visit_stack, | |
1985 const void* user_data, | |
1986 AdvancedHeapWalkContext context) { | |
1987 _tag_map = tag_map; | |
1988 _visit_stack = visit_stack; | |
1989 _user_data = user_data; | |
1990 _advanced_context = context; | |
1991 _basic_context.invalidate(); // will trigger assertion if used | |
1992 _heap_walk_type = advanced; | |
1993 } | |
1994 | |
1995 | |
1996 // invoke basic style heap root callback | |
1997 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
1998 assert(ServiceUtil::visible_oop(obj), "checking"); | |
1999 | |
2000 // if we heap roots should be reported | |
2001 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
2002 if (cb == NULL) { | |
2003 return check_for_visit(obj); | |
2004 } | |
2005 | |
2006 CallbackWrapper wrapper(tag_map(), obj); | |
2007 jvmtiIterationControl control = (*cb)(root_kind, | |
2008 wrapper.klass_tag(), | |
2009 wrapper.obj_size(), | |
2010 wrapper.obj_tag_p(), | |
2011 (void*)user_data()); | |
2012 // push root to visit stack when following references | |
2013 if (control == JVMTI_ITERATION_CONTINUE && | |
2014 basic_context()->object_ref_callback() != NULL) { | |
2015 visit_stack()->push(obj); | |
2016 } | |
2017 return control != JVMTI_ITERATION_ABORT; | |
2018 } | |
2019 | |
2020 // invoke basic style stack ref callback | |
2021 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
2022 jlong thread_tag, | |
2023 jint depth, | |
2024 jmethodID method, | |
2025 jint slot, | |
2026 oop obj) { | |
2027 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2028 | |
2029 // if we stack refs should be reported | |
2030 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
2031 if (cb == NULL) { | |
2032 return check_for_visit(obj); | |
2033 } | |
2034 | |
2035 CallbackWrapper wrapper(tag_map(), obj); | |
2036 jvmtiIterationControl control = (*cb)(root_kind, | |
2037 wrapper.klass_tag(), | |
2038 wrapper.obj_size(), | |
2039 wrapper.obj_tag_p(), | |
2040 thread_tag, | |
2041 depth, | |
2042 method, | |
2043 slot, | |
2044 (void*)user_data()); | |
2045 // push root to visit stack when following references | |
2046 if (control == JVMTI_ITERATION_CONTINUE && | |
2047 basic_context()->object_ref_callback() != NULL) { | |
2048 visit_stack()->push(obj); | |
2049 } | |
2050 return control != JVMTI_ITERATION_ABORT; | |
2051 } | |
2052 | |
2053 // invoke basic style object reference callback | |
2054 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
2055 oop referrer, | |
2056 oop referree, | |
2057 jint index) { | |
2058 | |
2059 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2060 assert(ServiceUtil::visible_oop(referree), "checking"); | |
2061 | |
2062 BasicHeapWalkContext* context = basic_context(); | |
2063 | |
2064 // callback requires the referrer's tag. If it's the same referrer | |
2065 // as the last call then we use the cached value. | |
2066 jlong referrer_tag; | |
2067 if (referrer == context->last_referrer()) { | |
2068 referrer_tag = context->last_referrer_tag(); | |
2069 } else { | |
2070 referrer_tag = tag_for(tag_map(), klassOop_if_java_lang_Class(referrer)); | |
2071 } | |
2072 | |
2073 // do the callback | |
2074 CallbackWrapper wrapper(tag_map(), referree); | |
2075 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
2076 jvmtiIterationControl control = (*cb)(ref_kind, | |
2077 wrapper.klass_tag(), | |
2078 wrapper.obj_size(), | |
2079 wrapper.obj_tag_p(), | |
2080 referrer_tag, | |
2081 index, | |
2082 (void*)user_data()); | |
2083 | |
2084 // record referrer and referrer tag. For self-references record the | |
2085 // tag value from the callback as this might differ from referrer_tag. | |
2086 context->set_last_referrer(referrer); | |
2087 if (referrer == referree) { | |
2088 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
2089 } else { | |
2090 context->set_last_referrer_tag(referrer_tag); | |
2091 } | |
2092 | |
2093 if (control == JVMTI_ITERATION_CONTINUE) { | |
2094 return check_for_visit(referree); | |
2095 } else { | |
2096 return control != JVMTI_ITERATION_ABORT; | |
2097 } | |
2098 } | |
2099 | |
2100 // invoke advanced style heap root callback | |
2101 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
2102 oop obj) { | |
2103 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2104 | |
2105 AdvancedHeapWalkContext* context = advanced_context(); | |
2106 | |
2107 // check that callback is provided | |
2108 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2109 if (cb == NULL) { | |
2110 return check_for_visit(obj); | |
2111 } | |
2112 | |
2113 // apply class filter | |
2114 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2115 return check_for_visit(obj); | |
2116 } | |
2117 | |
2118 // setup the callback wrapper | |
2119 CallbackWrapper wrapper(tag_map(), obj); | |
2120 | |
2121 // apply tag filter | |
2122 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2123 wrapper.klass_tag(), | |
2124 context->heap_filter())) { | |
2125 return check_for_visit(obj); | |
2126 } | |
2127 | |
2128 // for arrays we need the length, otherwise -1 | |
2129 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2130 | |
2131 // invoke the callback | |
2132 jint res = (*cb)(ref_kind, | |
2133 NULL, // referrer info | |
2134 wrapper.klass_tag(), | |
2135 0, // referrer_class_tag is 0 for heap root | |
2136 wrapper.obj_size(), | |
2137 wrapper.obj_tag_p(), | |
2138 NULL, // referrer_tag_p | |
2139 len, | |
2140 (void*)user_data()); | |
2141 if (res & JVMTI_VISIT_ABORT) { | |
2142 return false;// referrer class tag | |
2143 } | |
2144 if (res & JVMTI_VISIT_OBJECTS) { | |
2145 check_for_visit(obj); | |
2146 } | |
2147 return true; | |
2148 } | |
2149 | |
2150 // report a reference from a thread stack to an object | |
2151 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
2152 jlong thread_tag, | |
2153 jlong tid, | |
2154 int depth, | |
2155 jmethodID method, | |
2156 jlocation bci, | |
2157 jint slot, | |
2158 oop obj) { | |
2159 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2160 | |
2161 AdvancedHeapWalkContext* context = advanced_context(); | |
2162 | |
2163 // check that callback is provider | |
2164 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2165 if (cb == NULL) { | |
2166 return check_for_visit(obj); | |
2167 } | |
2168 | |
2169 // apply class filter | |
2170 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2171 return check_for_visit(obj); | |
2172 } | |
2173 | |
2174 // setup the callback wrapper | |
2175 CallbackWrapper wrapper(tag_map(), obj); | |
2176 | |
2177 // apply tag filter | |
2178 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2179 wrapper.klass_tag(), | |
2180 context->heap_filter())) { | |
2181 return check_for_visit(obj); | |
2182 } | |
2183 | |
2184 // setup the referrer info | |
2185 jvmtiHeapReferenceInfo reference_info; | |
2186 reference_info.stack_local.thread_tag = thread_tag; | |
2187 reference_info.stack_local.thread_id = tid; | |
2188 reference_info.stack_local.depth = depth; | |
2189 reference_info.stack_local.method = method; | |
2190 reference_info.stack_local.location = bci; | |
2191 reference_info.stack_local.slot = slot; | |
2192 | |
2193 // for arrays we need the length, otherwise -1 | |
2194 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2195 | |
2196 // call into the agent | |
2197 int res = (*cb)(ref_kind, | |
2198 &reference_info, | |
2199 wrapper.klass_tag(), | |
2200 0, // referrer_class_tag is 0 for heap root (stack) | |
2201 wrapper.obj_size(), | |
2202 wrapper.obj_tag_p(), | |
2203 NULL, // referrer_tag is 0 for root | |
2204 len, | |
2205 (void*)user_data()); | |
2206 | |
2207 if (res & JVMTI_VISIT_ABORT) { | |
2208 return false; | |
2209 } | |
2210 if (res & JVMTI_VISIT_OBJECTS) { | |
2211 check_for_visit(obj); | |
2212 } | |
2213 return true; | |
2214 } | |
2215 | |
2216 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
2217 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
2218 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
2219 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
2220 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
2221 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
2222 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
2223 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
2224 | |
2225 // invoke the object reference callback to report a reference | |
2226 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
2227 oop referrer, | |
2228 oop obj, | |
2229 jint index) | |
2230 { | |
2231 // field index is only valid field in reference_info | |
2232 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2233 | |
2234 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2235 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2236 | |
2237 AdvancedHeapWalkContext* context = advanced_context(); | |
2238 | |
2239 // check that callback is provider | |
2240 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2241 if (cb == NULL) { | |
2242 return check_for_visit(obj); | |
2243 } | |
2244 | |
2245 // apply class filter | |
2246 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2247 return check_for_visit(obj); | |
2248 } | |
2249 | |
2250 // setup the callback wrapper | |
2251 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
2252 | |
2253 // apply tag filter | |
2254 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2255 wrapper.klass_tag(), | |
2256 context->heap_filter())) { | |
2257 return check_for_visit(obj); | |
2258 } | |
2259 | |
2260 // field index is only valid field in reference_info | |
2261 reference_info.field.index = index; | |
2262 | |
2263 // for arrays we need the length, otherwise -1 | |
2264 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2265 | |
2266 // invoke the callback | |
2267 int res = (*cb)(ref_kind, | |
2268 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
2269 wrapper.klass_tag(), | |
2270 wrapper.referrer_klass_tag(), | |
2271 wrapper.obj_size(), | |
2272 wrapper.obj_tag_p(), | |
2273 wrapper.referrer_tag_p(), | |
2274 len, | |
2275 (void*)user_data()); | |
2276 | |
2277 if (res & JVMTI_VISIT_ABORT) { | |
2278 return false; | |
2279 } | |
2280 if (res & JVMTI_VISIT_OBJECTS) { | |
2281 check_for_visit(obj); | |
2282 } | |
2283 return true; | |
2284 } | |
2285 | |
2286 // report a "simple root" | |
2287 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
2288 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
2289 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
2290 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2291 | |
2292 if (is_basic_heap_walk()) { | |
2293 // map to old style root kind | |
2294 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
2295 return invoke_basic_heap_root_callback(root_kind, obj); | |
2296 } else { | |
2297 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
2298 return invoke_advanced_heap_root_callback(kind, obj); | |
2299 } | |
2300 } | |
2301 | |
2302 | |
2303 // invoke the primitive array values | |
2304 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
2305 assert(obj->is_typeArray(), "not a primitive array"); | |
2306 | |
2307 AdvancedHeapWalkContext* context = advanced_context(); | |
2308 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
2309 | |
2310 // apply class filter | |
2311 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2312 return true; | |
2313 } | |
2314 | |
2315 CallbackWrapper wrapper(tag_map(), obj); | |
2316 | |
2317 // apply tag filter | |
2318 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2319 wrapper.klass_tag(), | |
2320 context->heap_filter())) { | |
2321 return true; | |
2322 } | |
2323 | |
2324 // invoke the callback | |
2325 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
2326 &wrapper, | |
2327 obj, | |
2328 (void*)user_data()); | |
2329 return (!(res & JVMTI_VISIT_ABORT)); | |
2330 } | |
2331 | |
2332 // invoke the string value callback | |
2333 inline bool CallbackInvoker::report_string_value(oop str) { | |
1142 | 2334 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 2335 |
2336 AdvancedHeapWalkContext* context = advanced_context(); | |
2337 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
2338 | |
2339 // apply class filter | |
2340 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
2341 return true; | |
2342 } | |
2343 | |
2344 CallbackWrapper wrapper(tag_map(), str); | |
2345 | |
2346 // apply tag filter | |
2347 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2348 wrapper.klass_tag(), | |
2349 context->heap_filter())) { | |
2350 return true; | |
2351 } | |
2352 | |
2353 // invoke the callback | |
2354 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
2355 &wrapper, | |
2356 str, | |
2357 (void*)user_data()); | |
2358 return (!(res & JVMTI_VISIT_ABORT)); | |
2359 } | |
2360 | |
2361 // invoke the primitive field callback | |
2362 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
2363 oop obj, | |
2364 jint index, | |
2365 address addr, | |
2366 char type) | |
2367 { | |
2368 // for primitive fields only the index will be set | |
2369 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2370 | |
2371 AdvancedHeapWalkContext* context = advanced_context(); | |
2372 assert(context->primitive_field_callback() != NULL, "no callback"); | |
2373 | |
2374 // apply class filter | |
2375 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2376 return true; | |
2377 } | |
2378 | |
2379 CallbackWrapper wrapper(tag_map(), obj); | |
2380 | |
2381 // apply tag filter | |
2382 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2383 wrapper.klass_tag(), | |
2384 context->heap_filter())) { | |
2385 return true; | |
2386 } | |
2387 | |
2388 // the field index in the referrer | |
2389 reference_info.field.index = index; | |
2390 | |
2391 // map the type | |
2392 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
2393 | |
2394 // setup the jvalue | |
2395 jvalue value; | |
2396 copy_to_jvalue(&value, addr, value_type); | |
2397 | |
2398 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
2399 int res = (*cb)(ref_kind, | |
2400 &reference_info, | |
2401 wrapper.klass_tag(), | |
2402 wrapper.obj_tag_p(), | |
2403 value, | |
2404 value_type, | |
2405 (void*)user_data()); | |
2406 return (!(res & JVMTI_VISIT_ABORT)); | |
2407 } | |
2408 | |
2409 | |
2410 // instance field | |
2411 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
2412 jint index, | |
2413 address value, | |
2414 char type) { | |
2415 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
2416 obj, | |
2417 index, | |
2418 value, | |
2419 type); | |
2420 } | |
2421 | |
2422 // static field | |
2423 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
2424 jint index, | |
2425 address value, | |
2426 char type) { | |
2427 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
2428 obj, | |
2429 index, | |
2430 value, | |
2431 type); | |
2432 } | |
2433 | |
2434 // report a JNI local (root object) to the profiler | |
2435 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
2436 if (is_basic_heap_walk()) { | |
2437 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
2438 thread_tag, | |
2439 depth, | |
2440 m, | |
2441 -1, | |
2442 obj); | |
2443 } else { | |
2444 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
2445 thread_tag, tid, | |
2446 depth, | |
2447 m, | |
2448 (jlocation)-1, | |
2449 -1, | |
2450 obj); | |
2451 } | |
2452 } | |
2453 | |
2454 | |
2455 // report a local (stack reference, root object) | |
2456 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
2457 jlong tid, | |
2458 jint depth, | |
2459 jmethodID method, | |
2460 jlocation bci, | |
2461 jint slot, | |
2462 oop obj) { | |
2463 if (is_basic_heap_walk()) { | |
2464 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
2465 thread_tag, | |
2466 depth, | |
2467 method, | |
2468 slot, | |
2469 obj); | |
2470 } else { | |
2471 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
2472 thread_tag, | |
2473 tid, | |
2474 depth, | |
2475 method, | |
2476 bci, | |
2477 slot, | |
2478 obj); | |
2479 } | |
2480 } | |
2481 | |
2482 // report an object referencing a class. | |
2483 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
2484 if (is_basic_heap_walk()) { | |
2485 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2486 } else { | |
2487 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
2488 } | |
2489 } | |
2490 | |
2491 // report a class referencing its class loader. | |
2492 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
2493 if (is_basic_heap_walk()) { | |
2494 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2495 } else { | |
2496 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2497 } | |
2498 } | |
2499 | |
2500 // report a class referencing its signers. | |
2501 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
2502 if (is_basic_heap_walk()) { | |
2503 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
2504 } else { | |
2505 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
2506 } | |
2507 } | |
2508 | |
2509 // report a class referencing its protection domain.. | |
2510 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
2511 if (is_basic_heap_walk()) { | |
2512 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2513 } else { | |
2514 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2515 } | |
2516 } | |
2517 | |
2518 // report a class referencing its superclass. | |
2519 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
2520 if (is_basic_heap_walk()) { | |
2521 // Send this to be consistent with past implementation | |
2522 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2523 } else { | |
2524 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); | |
2525 } | |
2526 } | |
2527 | |
2528 // report a class referencing one of its interfaces. | |
2529 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
2530 if (is_basic_heap_walk()) { | |
2531 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
2532 } else { | |
2533 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
2534 } | |
2535 } | |
2536 | |
2537 // report a class referencing one of its static fields. | |
2538 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
2539 if (is_basic_heap_walk()) { | |
2540 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2541 } else { | |
2542 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2543 } | |
2544 } | |
2545 | |
2546 // report an array referencing an element object | |
2547 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
2548 if (is_basic_heap_walk()) { | |
2549 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2550 } else { | |
2551 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2552 } | |
2553 } | |
2554 | |
2555 // report an object referencing an instance field object | |
2556 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
2557 if (is_basic_heap_walk()) { | |
2558 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
2559 } else { | |
2560 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
2561 } | |
2562 } | |
2563 | |
2564 // report an array referencing an element object | |
2565 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
2566 if (is_basic_heap_walk()) { | |
2567 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2568 } else { | |
2569 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2570 } | |
2571 } | |
2572 | |
2573 // A supporting closure used to process simple roots | |
2574 class SimpleRootsClosure : public OopClosure { | |
2575 private: | |
2576 jvmtiHeapReferenceKind _kind; | |
2577 bool _continue; | |
2578 | |
2579 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
2580 | |
2581 public: | |
2582 void set_kind(jvmtiHeapReferenceKind kind) { | |
2583 _kind = kind; | |
2584 _continue = true; | |
2585 } | |
2586 | |
2587 inline bool stopped() { | |
2588 return !_continue; | |
2589 } | |
2590 | |
2591 void do_oop(oop* obj_p) { | |
2592 // iteration has terminated | |
2593 if (stopped()) { | |
2594 return; | |
2595 } | |
2596 | |
2597 // ignore null or deleted handles | |
2598 oop o = *obj_p; | |
2599 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2600 return; | |
2601 } | |
2602 | |
2603 jvmtiHeapReferenceKind kind = root_kind(); | |
2604 | |
2605 // many roots are Klasses so we use the java mirror | |
2606 if (o->is_klass()) { | |
2607 klassOop k = (klassOop)o; | |
2608 o = Klass::cast(k)->java_mirror(); | |
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2609 if (o == NULL) { |
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2610 // Classes without mirrors don't correspond to real Java |
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2611 // classes so just ignore them. |
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2612 return; |
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2613 } |
0 | 2614 } else { |
2615 | |
2616 // SystemDictionary::always_strong_oops_do reports the application | |
2617 // class loader as a root. We want this root to be reported as | |
2618 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
2619 if (o->is_instance() && root_kind() == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { | |
2620 kind = JVMTI_HEAP_REFERENCE_OTHER; | |
2621 } | |
2622 } | |
2623 | |
2624 // some objects are ignored - in the case of simple | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2145
diff
changeset
|
2625 // roots it's mostly Symbol*s that we are skipping |
0 | 2626 // here. |
2627 if (!ServiceUtil::visible_oop(o)) { | |
2628 return; | |
2629 } | |
2630 | |
2631 // invoke the callback | |
2632 _continue = CallbackInvoker::report_simple_root(kind, o); | |
2633 | |
2634 } | |
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2635 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2636 }; |
2637 | |
2638 // A supporting closure used to process JNI locals | |
2639 class JNILocalRootsClosure : public OopClosure { | |
2640 private: | |
2641 jlong _thread_tag; | |
2642 jlong _tid; | |
2643 jint _depth; | |
2644 jmethodID _method; | |
2645 bool _continue; | |
2646 public: | |
2647 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
2648 _thread_tag = thread_tag; | |
2649 _tid = tid; | |
2650 _depth = depth; | |
2651 _method = method; | |
2652 _continue = true; | |
2653 } | |
2654 | |
2655 inline bool stopped() { | |
2656 return !_continue; | |
2657 } | |
2658 | |
2659 void do_oop(oop* obj_p) { | |
2660 // iteration has terminated | |
2661 if (stopped()) { | |
2662 return; | |
2663 } | |
2664 | |
2665 // ignore null or deleted handles | |
2666 oop o = *obj_p; | |
2667 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2668 return; | |
2669 } | |
2670 | |
2671 if (!ServiceUtil::visible_oop(o)) { | |
2672 return; | |
2673 } | |
2674 | |
2675 // invoke the callback | |
2676 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
2677 } | |
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2678 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2679 }; |
2680 | |
2681 | |
2682 // A VM operation to iterate over objects that are reachable from | |
2683 // a set of roots or an initial object. | |
2684 // | |
2685 // For VM_HeapWalkOperation the set of roots used is :- | |
2686 // | |
2687 // - All JNI global references | |
2688 // - All inflated monitors | |
2689 // - All classes loaded by the boot class loader (or all classes | |
2690 // in the event that class unloading is disabled) | |
2691 // - All java threads | |
2692 // - For each java thread then all locals and JNI local references | |
2693 // on the thread's execution stack | |
2694 // - All visible/explainable objects from Universes::oops_do | |
2695 // | |
2696 class VM_HeapWalkOperation: public VM_Operation { | |
2697 private: | |
2698 enum { | |
2699 initial_visit_stack_size = 4000 | |
2700 }; | |
2701 | |
2702 bool _is_advanced_heap_walk; // indicates FollowReferences | |
2703 JvmtiTagMap* _tag_map; | |
2704 Handle _initial_object; | |
2705 GrowableArray<oop>* _visit_stack; // the visit stack | |
2706 | |
2707 bool _collecting_heap_roots; // are we collecting roots | |
2708 bool _following_object_refs; // are we following object references | |
2709 | |
2710 bool _reporting_primitive_fields; // optional reporting | |
2711 bool _reporting_primitive_array_values; | |
2712 bool _reporting_string_values; | |
2713 | |
2714 GrowableArray<oop>* create_visit_stack() { | |
2715 return new (ResourceObj::C_HEAP) GrowableArray<oop>(initial_visit_stack_size, true); | |
2716 } | |
2717 | |
2718 // accessors | |
2719 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
2720 JvmtiTagMap* tag_map() const { return _tag_map; } | |
2721 Handle initial_object() const { return _initial_object; } | |
2722 | |
2723 bool is_following_references() const { return _following_object_refs; } | |
2724 | |
2725 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
2726 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
2727 bool is_reporting_string_values() const { return _reporting_string_values; } | |
2728 | |
2729 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
2730 | |
2731 // iterate over the various object types | |
2732 inline bool iterate_over_array(oop o); | |
2733 inline bool iterate_over_type_array(oop o); | |
2734 inline bool iterate_over_class(klassOop o); | |
2735 inline bool iterate_over_object(oop o); | |
2736 | |
2737 // root collection | |
2738 inline bool collect_simple_roots(); | |
2739 inline bool collect_stack_roots(); | |
2740 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
2741 | |
2742 // visit an object | |
2743 inline bool visit(oop o); | |
2744 | |
2745 public: | |
2746 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2747 Handle initial_object, | |
2748 BasicHeapWalkContext callbacks, | |
2749 const void* user_data); | |
2750 | |
2751 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2752 Handle initial_object, | |
2753 AdvancedHeapWalkContext callbacks, | |
2754 const void* user_data); | |
2755 | |
2756 ~VM_HeapWalkOperation(); | |
2757 | |
2758 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
2759 void doit(); | |
2760 }; | |
2761 | |
2762 | |
2763 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2764 Handle initial_object, | |
2765 BasicHeapWalkContext callbacks, | |
2766 const void* user_data) { | |
2767 _is_advanced_heap_walk = false; | |
2768 _tag_map = tag_map; | |
2769 _initial_object = initial_object; | |
2770 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
2771 _reporting_primitive_fields = false; | |
2772 _reporting_primitive_array_values = false; | |
2773 _reporting_string_values = false; | |
2774 _visit_stack = create_visit_stack(); | |
2775 | |
2776 | |
2777 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2778 } | |
2779 | |
2780 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2781 Handle initial_object, | |
2782 AdvancedHeapWalkContext callbacks, | |
2783 const void* user_data) { | |
2784 _is_advanced_heap_walk = true; | |
2785 _tag_map = tag_map; | |
2786 _initial_object = initial_object; | |
2787 _following_object_refs = true; | |
2788 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
2789 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
2790 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
2791 _visit_stack = create_visit_stack(); | |
2792 | |
2793 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2794 } | |
2795 | |
2796 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
2797 if (_following_object_refs) { | |
2798 assert(_visit_stack != NULL, "checking"); | |
2799 delete _visit_stack; | |
2800 _visit_stack = NULL; | |
2801 } | |
2802 } | |
2803 | |
2804 // an array references its class and has a reference to | |
2805 // each element in the array | |
2806 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
2807 objArrayOop array = objArrayOop(o); | |
2808 if (array->klass() == Universe::systemObjArrayKlassObj()) { | |
2809 // filtered out | |
2810 return true; | |
2811 } | |
2812 | |
2813 // array reference to its class | |
2814 oop mirror = objArrayKlass::cast(array->klass())->java_mirror(); | |
2815 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
2816 return false; | |
2817 } | |
2818 | |
2819 // iterate over the array and report each reference to a | |
2820 // non-null element | |
2821 for (int index=0; index<array->length(); index++) { | |
2822 oop elem = array->obj_at(index); | |
2823 if (elem == NULL) { | |
2824 continue; | |
2825 } | |
2826 | |
2827 // report the array reference o[index] = elem | |
2828 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
2829 return false; | |
2830 } | |
2831 } | |
2832 return true; | |
2833 } | |
2834 | |
2835 // a type array references its class | |
2836 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
2837 klassOop k = o->klass(); | |
2838 oop mirror = Klass::cast(k)->java_mirror(); | |
2839 if (!CallbackInvoker::report_class_reference(o, mirror)) { | |
2840 return false; | |
2841 } | |
2842 | |
2843 // report the array contents if required | |
2844 if (is_reporting_primitive_array_values()) { | |
2845 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
2846 return false; | |
2847 } | |
2848 } | |
2849 return true; | |
2850 } | |
2851 | |
2852 // verify that a static oop field is in range | |
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2853 static inline bool verify_static_oop(instanceKlass* ik, |
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2854 oop mirror, int offset) { |
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2855 address obj_p = (address)mirror + offset; |
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2856 address start = (address)instanceMirrorKlass::start_of_static_fields(mirror); |
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2857 address end = start + (java_lang_Class::static_oop_field_count(mirror) * heapOopSize); |
0 | 2858 assert(end >= start, "sanity check"); |
2859 | |
2860 if (obj_p >= start && obj_p < end) { | |
2861 return true; | |
2862 } else { | |
2863 return false; | |
2864 } | |
2865 } | |
2866 | |
2867 // a class references its super class, interfaces, class loader, ... | |
2868 // and finally its static fields | |
2869 inline bool VM_HeapWalkOperation::iterate_over_class(klassOop k) { | |
2870 int i; | |
2871 Klass* klass = klassOop(k)->klass_part(); | |
2872 | |
2873 if (klass->oop_is_instance()) { | |
2874 instanceKlass* ik = instanceKlass::cast(k); | |
2875 | |
2876 // ignore the class if it's has been initialized yet | |
2877 if (!ik->is_linked()) { | |
2878 return true; | |
2879 } | |
2880 | |
2881 // get the java mirror | |
2882 oop mirror = klass->java_mirror(); | |
2883 | |
2884 // super (only if something more interesting than java.lang.Object) | |
2885 klassOop java_super = ik->java_super(); | |
1142 | 2886 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
0 | 2887 oop super = Klass::cast(java_super)->java_mirror(); |
2888 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { | |
2889 return false; | |
2890 } | |
2891 } | |
2892 | |
2893 // class loader | |
2894 oop cl = ik->class_loader(); | |
2895 if (cl != NULL) { | |
2896 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
2897 return false; | |
2898 } | |
2899 } | |
2900 | |
2901 // protection domain | |
2902 oop pd = ik->protection_domain(); | |
2903 if (pd != NULL) { | |
2904 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
2905 return false; | |
2906 } | |
2907 } | |
2908 | |
2909 // signers | |
2910 oop signers = ik->signers(); | |
2911 if (signers != NULL) { | |
2912 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
2913 return false; | |
2914 } | |
2915 } | |
2916 | |
2917 // references from the constant pool | |
2918 { | |
2919 const constantPoolOop pool = ik->constants(); | |
2920 for (int i = 1; i < pool->length(); i++) { | |
2921 constantTag tag = pool->tag_at(i).value(); | |
2922 if (tag.is_string() || tag.is_klass()) { | |
2923 oop entry; | |
2924 if (tag.is_string()) { | |
2925 entry = pool->resolved_string_at(i); | |
2926 assert(java_lang_String::is_instance(entry), "must be string"); | |
2927 } else { | |
2928 entry = Klass::cast(pool->resolved_klass_at(i))->java_mirror(); | |
2929 } | |
2930 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
2931 return false; | |
2932 } | |
2933 } | |
2934 } | |
2935 } | |
2936 | |
2937 // interfaces | |
2938 // (These will already have been reported as references from the constant pool | |
2939 // but are specified by IterateOverReachableObjects and must be reported). | |
2940 objArrayOop interfaces = ik->local_interfaces(); | |
2941 for (i = 0; i < interfaces->length(); i++) { | |
2942 oop interf = Klass::cast((klassOop)interfaces->obj_at(i))->java_mirror(); | |
2943 if (interf == NULL) { | |
2944 continue; | |
2945 } | |
2946 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
2947 return false; | |
2948 } | |
2949 } | |
2950 | |
2951 // iterate over the static fields | |
2952 | |
2953 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(k); | |
2954 for (i=0; i<field_map->field_count(); i++) { | |
2955 ClassFieldDescriptor* field = field_map->field_at(i); | |
2956 char type = field->field_type(); | |
2957 if (!is_primitive_field_type(type)) { | |
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2958 oop fld_o = mirror->obj_field(field->field_offset()); |
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2959 assert(verify_static_oop(ik, mirror, field->field_offset()), "sanity check"); |
0 | 2960 if (fld_o != NULL) { |
2961 int slot = field->field_index(); | |
2962 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
2963 delete field_map; | |
2964 return false; | |
2965 } | |
2966 } | |
2967 } else { | |
2968 if (is_reporting_primitive_fields()) { | |
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2969 address addr = (address)mirror + field->field_offset(); |
0 | 2970 int slot = field->field_index(); |
2971 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
2972 delete field_map; | |
2973 return false; | |
2974 } | |
2975 } | |
2976 } | |
2977 } | |
2978 delete field_map; | |
2979 | |
2980 return true; | |
2981 } | |
2982 | |
2983 return true; | |
2984 } | |
2985 | |
2986 // an object references a class and its instance fields | |
2987 // (static fields are ignored here as we report these as | |
2988 // references from the class). | |
2989 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
2990 // reference to the class | |
2991 if (!CallbackInvoker::report_class_reference(o, Klass::cast(o->klass())->java_mirror())) { | |
2992 return false; | |
2993 } | |
2994 | |
2995 // iterate over instance fields | |
2996 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
2997 for (int i=0; i<field_map->field_count(); i++) { | |
2998 ClassFieldDescriptor* field = field_map->field_at(i); | |
2999 char type = field->field_type(); | |
3000 if (!is_primitive_field_type(type)) { | |
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3001 oop fld_o = o->obj_field(field->field_offset()); |
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3002 // ignore any objects that aren't visible to profiler |
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3003 if (fld_o != NULL && ServiceUtil::visible_oop(fld_o)) { |
0 | 3004 // reflection code may have a reference to a klassOop. |
3005 // - see sun.reflect.UnsafeStaticFieldAccessorImpl and sun.misc.Unsafe | |
3006 if (fld_o->is_klass()) { | |
3007 klassOop k = (klassOop)fld_o; | |
3008 fld_o = Klass::cast(k)->java_mirror(); | |
3009 } | |
3010 int slot = field->field_index(); | |
3011 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
3012 return false; | |
3013 } | |
3014 } | |
3015 } else { | |
3016 if (is_reporting_primitive_fields()) { | |
3017 // primitive instance field | |
3018 address addr = (address)o + field->field_offset(); | |
3019 int slot = field->field_index(); | |
3020 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
3021 return false; | |
3022 } | |
3023 } | |
3024 } | |
3025 } | |
3026 | |
3027 // if the object is a java.lang.String | |
3028 if (is_reporting_string_values() && | |
1142 | 3029 o->klass() == SystemDictionary::String_klass()) { |
0 | 3030 if (!CallbackInvoker::report_string_value(o)) { |
3031 return false; | |
3032 } | |
3033 } | |
3034 return true; | |
3035 } | |
3036 | |
3037 | |
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3038 // Collects all simple (non-stack) roots except for threads; |
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3039 // threads are handled in collect_stack_roots() as an optimization. |
0 | 3040 // if there's a heap root callback provided then the callback is |
3041 // invoked for each simple root. | |
3042 // if an object reference callback is provided then all simple | |
3043 // roots are pushed onto the marking stack so that they can be | |
3044 // processed later | |
3045 // | |
3046 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
3047 SimpleRootsClosure blk; | |
3048 | |
3049 // JNI globals | |
3050 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
3051 JNIHandles::oops_do(&blk); | |
3052 if (blk.stopped()) { | |
3053 return false; | |
3054 } | |
3055 | |
3056 // Preloaded classes and loader from the system dictionary | |
3057 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
3058 SystemDictionary::always_strong_oops_do(&blk); | |
3059 if (blk.stopped()) { | |
3060 return false; | |
3061 } | |
3062 | |
3063 // Inflated monitors | |
3064 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
3065 ObjectSynchronizer::oops_do(&blk); | |
3066 if (blk.stopped()) { | |
3067 return false; | |
3068 } | |
3069 | |
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3070 // threads are now handled in collect_stack_roots() |
0 | 3071 |
3072 // Other kinds of roots maintained by HotSpot | |
3073 // Many of these won't be visible but others (such as instances of important | |
3074 // exceptions) will be visible. | |
3075 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
3076 Universe::oops_do(&blk); | |
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3077 |
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3078 // If there are any non-perm roots in the code cache, visit them. |
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3079 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
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3080 CodeBlobToOopClosure look_in_blobs(&blk, false); |
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3081 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
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3082 |
0 | 3083 return true; |
3084 } | |
3085 | |
3086 // Walk the stack of a given thread and find all references (locals | |
3087 // and JNI calls) and report these as stack references | |
3088 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
3089 JNILocalRootsClosure* blk) | |
3090 { | |
3091 oop threadObj = java_thread->threadObj(); | |
3092 assert(threadObj != NULL, "sanity check"); | |
3093 | |
3094 // only need to get the thread's tag once per thread | |
3095 jlong thread_tag = tag_for(_tag_map, threadObj); | |
3096 | |
3097 // also need the thread id | |
3098 jlong tid = java_lang_Thread::thread_id(threadObj); | |
3099 | |
3100 | |
3101 if (java_thread->has_last_Java_frame()) { | |
3102 | |
3103 // vframes are resource allocated | |
3104 Thread* current_thread = Thread::current(); | |
3105 ResourceMark rm(current_thread); | |
3106 HandleMark hm(current_thread); | |
3107 | |
3108 RegisterMap reg_map(java_thread); | |
3109 frame f = java_thread->last_frame(); | |
3110 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
3111 | |
3112 bool is_top_frame = true; | |
3113 int depth = 0; | |
3114 frame* last_entry_frame = NULL; | |
3115 | |
3116 while (vf != NULL) { | |
3117 if (vf->is_java_frame()) { | |
3118 | |
3119 // java frame (interpreted, compiled, ...) | |
3120 javaVFrame *jvf = javaVFrame::cast(vf); | |
3121 | |
3122 // the jmethodID | |
3123 jmethodID method = jvf->method()->jmethod_id(); | |
3124 | |
3125 if (!(jvf->method()->is_native())) { | |
3126 jlocation bci = (jlocation)jvf->bci(); | |
3127 StackValueCollection* locals = jvf->locals(); | |
3128 for (int slot=0; slot<locals->size(); slot++) { | |
3129 if (locals->at(slot)->type() == T_OBJECT) { | |
3130 oop o = locals->obj_at(slot)(); | |
3131 if (o == NULL) { | |
3132 continue; | |
3133 } | |
3134 | |
3135 // stack reference | |
3136 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
3137 bci, slot, o)) { | |
3138 return false; | |
3139 } | |
3140 } | |
3141 } | |
3142 } else { | |
3143 blk->set_context(thread_tag, tid, depth, method); | |
3144 if (is_top_frame) { | |
3145 // JNI locals for the top frame. | |
3146 java_thread->active_handles()->oops_do(blk); | |
3147 } else { | |
3148 if (last_entry_frame != NULL) { | |
3149 // JNI locals for the entry frame | |
3150 assert(last_entry_frame->is_entry_frame(), "checking"); | |
3151 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
3152 } | |
3153 } | |
3154 } | |
3155 last_entry_frame = NULL; | |
3156 depth++; | |
3157 } else { | |
3158 // externalVFrame - for an entry frame then we report the JNI locals | |
3159 // when we find the corresponding javaVFrame | |
3160 frame* fr = vf->frame_pointer(); | |
3161 assert(fr != NULL, "sanity check"); | |
3162 if (fr->is_entry_frame()) { | |
3163 last_entry_frame = fr; | |
3164 } | |
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
2377
diff
changeset
|
3165 if (fr->is_ricochet_frame()) { |
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
2377
diff
changeset
|
3166 fr->oops_ricochet_do(blk, vf->register_map()); |
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
2377
diff
changeset
|
3167 } |
0 | 3168 } |
3169 | |
3170 vf = vf->sender(); | |
3171 is_top_frame = false; | |
3172 } | |
3173 } else { | |
3174 // no last java frame but there may be JNI locals | |
3175 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
3176 java_thread->active_handles()->oops_do(blk); | |
3177 } | |
3178 return true; | |
3179 } | |
3180 | |
3181 | |
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3182 // Collects the simple roots for all threads and collects all |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3183 // stack roots - for each thread it walks the execution |
0 | 3184 // stack to find all references and local JNI refs. |
3185 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
3186 JNILocalRootsClosure blk; | |
3187 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
3188 oop threadObj = thread->threadObj(); | |
3189 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3190 // Collect the simple root for this thread before we |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3191 // collect its stack roots |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3192 if (!CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3193 threadObj)) { |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3194 return false; |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3195 } |
0 | 3196 if (!collect_stack_roots(thread, &blk)) { |
3197 return false; | |
3198 } | |
3199 } | |
3200 } | |
3201 return true; | |
3202 } | |
3203 | |
3204 // visit an object | |
3205 // first mark the object as visited | |
3206 // second get all the outbound references from this object (in other words, all | |
3207 // the objects referenced by this object). | |
3208 // | |
3209 bool VM_HeapWalkOperation::visit(oop o) { | |
3210 // mark object as visited | |
3211 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
3212 ObjectMarker::mark(o); | |
3213 | |
3214 // instance | |
3215 if (o->is_instance()) { | |
1142 | 3216 if (o->klass() == SystemDictionary::Class_klass()) { |
0 | 3217 o = klassOop_if_java_lang_Class(o); |
3218 if (o->is_klass()) { | |
3219 // a java.lang.Class | |
3220 return iterate_over_class(klassOop(o)); | |
3221 } | |
3222 } else { | |
3223 return iterate_over_object(o); | |
3224 } | |
3225 } | |
3226 | |
3227 // object array | |
3228 if (o->is_objArray()) { | |
3229 return iterate_over_array(o); | |
3230 } | |
3231 | |
3232 // type array | |
3233 if (o->is_typeArray()) { | |
3234 return iterate_over_type_array(o); | |
3235 } | |
3236 | |
3237 return true; | |
3238 } | |
3239 | |
3240 void VM_HeapWalkOperation::doit() { | |
3241 ResourceMark rm; | |
3242 ObjectMarkerController marker; | |
3243 ClassFieldMapCacheMark cm; | |
3244 | |
3245 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
3246 | |
3247 // the heap walk starts with an initial object or the heap roots | |
3248 if (initial_object().is_null()) { | |
3815 | 3249 // If either collect_stack_roots() or collect_simple_roots() |
3250 // returns false at this point, then there are no mark bits | |
3251 // to reset. | |
3252 ObjectMarker::set_needs_reset(false); | |
3253 | |
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3254 // Calling collect_stack_roots() before collect_simple_roots() |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3255 // can result in a big performance boost for an agent that is |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3256 // focused on analyzing references in the thread stacks. |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3257 if (!collect_stack_roots()) return; |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3258 |
0 | 3259 if (!collect_simple_roots()) return; |
3815 | 3260 |
3261 // no early return so enable heap traversal to reset the mark bits | |
3262 ObjectMarker::set_needs_reset(true); | |
0 | 3263 } else { |
3264 visit_stack()->push(initial_object()()); | |
3265 } | |
3266 | |
3267 // object references required | |
3268 if (is_following_references()) { | |
3269 | |
3270 // visit each object until all reachable objects have been | |
3271 // visited or the callback asked to terminate the iteration. | |
3272 while (!visit_stack()->is_empty()) { | |
3273 oop o = visit_stack()->pop(); | |
3274 if (!ObjectMarker::visited(o)) { | |
3275 if (!visit(o)) { | |
3276 break; | |
3277 } | |
3278 } | |
3279 } | |
3280 } | |
3281 } | |
3282 | |
3283 // iterate over all objects that are reachable from a set of roots | |
3284 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
3285 jvmtiStackReferenceCallback stack_ref_callback, | |
3286 jvmtiObjectReferenceCallback object_ref_callback, | |
3287 const void* user_data) { | |
3288 MutexLocker ml(Heap_lock); | |
3289 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
3290 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
3291 VMThread::execute(&op); | |
3292 } | |
3293 | |
3294 // iterate over all objects that are reachable from a given object | |
3295 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
3296 jvmtiObjectReferenceCallback object_ref_callback, | |
3297 const void* user_data) { | |
3298 oop obj = JNIHandles::resolve(object); | |
3299 Handle initial_object(Thread::current(), obj); | |
3300 | |
3301 MutexLocker ml(Heap_lock); | |
3302 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
3303 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3304 VMThread::execute(&op); | |
3305 } | |
3306 | |
3307 // follow references from an initial object or the GC roots | |
3308 void JvmtiTagMap::follow_references(jint heap_filter, | |
3309 KlassHandle klass, | |
3310 jobject object, | |
3311 const jvmtiHeapCallbacks* callbacks, | |
3312 const void* user_data) | |
3313 { | |
3314 oop obj = JNIHandles::resolve(object); | |
3315 Handle initial_object(Thread::current(), obj); | |
3316 | |
3317 MutexLocker ml(Heap_lock); | |
3318 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
3319 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3320 VMThread::execute(&op); | |
3321 } | |
3322 | |
3323 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3324 void JvmtiTagMap::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) { |
2145
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3325 // No locks during VM bring-up (0 threads) and no safepoints after main |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3326 // thread creation and before VMThread creation (1 thread); initial GC |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3327 // verification can happen in that window which gets to here. |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3328 assert(Threads::number_of_threads() <= 1 || |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3329 SafepointSynchronize::is_at_safepoint(), |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3330 "must be executed at a safepoint"); |
0 | 3331 if (JvmtiEnv::environments_might_exist()) { |
3332 JvmtiEnvIterator it; | |
3333 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
3334 JvmtiTagMap* tag_map = env->tag_map(); | |
3335 if (tag_map != NULL && !tag_map->is_empty()) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3336 tag_map->do_weak_oops(is_alive, f); |
0 | 3337 } |
3338 } | |
3339 } | |
3340 } | |
3341 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3342 void JvmtiTagMap::do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f) { |
0 | 3343 |
3344 // does this environment have the OBJECT_FREE event enabled | |
3345 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
3346 | |
3347 // counters used for trace message | |
3348 int freed = 0; | |
3349 int moved = 0; | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3350 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3351 JvmtiTagHashmap* hashmap = this->hashmap(); |
0 | 3352 |
3353 // reenable sizing (if disabled) | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3354 hashmap->set_resizing_enabled(true); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3355 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3356 // if the hashmap is empty then we can skip it |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3357 if (hashmap->_entry_count == 0) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3358 return; |
0 | 3359 } |
3360 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3361 // now iterate through each entry in the table |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3362 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3363 JvmtiTagHashmapEntry** table = hashmap->table(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3364 int size = hashmap->size(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3365 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3366 JvmtiTagHashmapEntry* delayed_add = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3367 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3368 for (int pos = 0; pos < size; ++pos) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3369 JvmtiTagHashmapEntry* entry = table[pos]; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3370 JvmtiTagHashmapEntry* prev = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3371 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3372 while (entry != NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3373 JvmtiTagHashmapEntry* next = entry->next(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3374 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3375 oop* obj = entry->object_addr(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3376 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3377 // has object been GC'ed |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3378 if (!is_alive->do_object_b(entry->object())) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3379 // grab the tag |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3380 jlong tag = entry->tag(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3381 guarantee(tag != 0, "checking"); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3382 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3383 // remove GC'ed entry from hashmap and return the |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3384 // entry to the free list |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3385 hashmap->remove(prev, pos, entry); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3386 destroy_entry(entry); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3387 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3388 // post the event to the profiler |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3389 if (post_object_free) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3390 JvmtiExport::post_object_free(env(), tag); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3391 } |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3392 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3393 ++freed; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3394 } else { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3395 f->do_oop(entry->object_addr()); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3396 oop new_oop = entry->object(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3397 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3398 // if the object has moved then re-hash it and move its |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3399 // entry to its new location. |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3400 unsigned int new_pos = JvmtiTagHashmap::hash(new_oop, size); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3401 if (new_pos != (unsigned int)pos) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3402 if (prev == NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3403 table[pos] = next; |
7246a374a9f2
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|
3404 } else { |
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|
3405 prev->set_next(next); |
0 | 3406 } |
2125
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|
3407 if (new_pos < (unsigned int)pos) { |
0 | 3408 entry->set_next(table[new_pos]); |
3409 table[new_pos] = entry; | |
3410 } else { | |
2125
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diff
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|
3411 // Delay adding this entry to it's new position as we'd end up |
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diff
changeset
|
3412 // hitting it again during this iteration. |
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diff
changeset
|
3413 entry->set_next(delayed_add); |
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diff
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|
3414 delayed_add = entry; |
0 | 3415 } |
2125
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|
3416 moved++; |
0 | 3417 } else { |
2125
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changeset
|
3418 // object didn't move |
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diff
changeset
|
3419 prev = entry; |
0 | 3420 } |
3421 } | |
2125
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|
3422 |
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diff
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|
3423 entry = next; |
0 | 3424 } |
3425 } | |
3426 | |
2125
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|
3427 // Re-add all the entries which were kept aside |
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diff
changeset
|
3428 while (delayed_add != NULL) { |
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kamg
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diff
changeset
|
3429 JvmtiTagHashmapEntry* next = delayed_add->next(); |
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diff
changeset
|
3430 unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size); |
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diff
changeset
|
3431 delayed_add->set_next(table[pos]); |
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diff
changeset
|
3432 table[pos] = delayed_add; |
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diff
changeset
|
3433 delayed_add = next; |
0 | 3434 } |
3435 | |
3436 // stats | |
3437 if (TraceJVMTIObjectTagging) { | |
2125
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diff
changeset
|
3438 int post_total = hashmap->_entry_count; |
0 | 3439 int pre_total = post_total + freed; |
3440 | |
2125
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diff
changeset
|
3441 tty->print_cr("(%d->%d, %d freed, %d total moves)", |
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kamg
parents:
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diff
changeset
|
3442 pre_total, post_total, freed, moved); |
0 | 3443 } |
3444 } |