Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiTagMap.cpp @ 14909:4ca6dc0799b6
Backout jdk9 merge
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Tue, 01 Apr 2014 13:57:07 +0200 |
parents | dcca80b5e7e7 |
children | 51c6ce89d4dd |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "jvmtifiles/jvmtiEnv.hpp" | |
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30 #include "oops/instanceMirrorKlass.hpp" |
1972 | 31 #include "oops/objArrayKlass.hpp" |
32 #include "oops/oop.inline2.hpp" | |
33 #include "prims/jvmtiEventController.hpp" | |
34 #include "prims/jvmtiEventController.inline.hpp" | |
35 #include "prims/jvmtiExport.hpp" | |
36 #include "prims/jvmtiImpl.hpp" | |
37 #include "prims/jvmtiTagMap.hpp" | |
38 #include "runtime/biasedLocking.hpp" | |
39 #include "runtime/javaCalls.hpp" | |
40 #include "runtime/jniHandles.hpp" | |
41 #include "runtime/mutex.hpp" | |
42 #include "runtime/mutexLocker.hpp" | |
43 #include "runtime/reflectionUtils.hpp" | |
44 #include "runtime/vframe.hpp" | |
45 #include "runtime/vmThread.hpp" | |
46 #include "runtime/vm_operations.hpp" | |
47 #include "services/serviceUtil.hpp" | |
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48 #include "utilities/macros.hpp" |
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49 #if INCLUDE_ALL_GCS |
1972 | 50 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
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51 #endif // INCLUDE_ALL_GCS |
0 | 52 |
53 // JvmtiTagHashmapEntry | |
54 // | |
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55 // Each entry encapsulates a reference to the tagged object |
0 | 56 // and the tag value. In addition an entry includes a next pointer which |
57 // is used to chain entries together. | |
58 | |
6197 | 59 class JvmtiTagHashmapEntry : public CHeapObj<mtInternal> { |
0 | 60 private: |
61 friend class JvmtiTagMap; | |
62 | |
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63 oop _object; // tagged object |
0 | 64 jlong _tag; // the tag |
65 JvmtiTagHashmapEntry* _next; // next on the list | |
66 | |
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67 inline void init(oop object, jlong tag) { |
0 | 68 _object = object; |
69 _tag = tag; | |
70 _next = NULL; | |
71 } | |
72 | |
73 // constructor | |
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74 JvmtiTagHashmapEntry(oop object, jlong tag) { init(object, tag); } |
0 | 75 |
76 public: | |
77 | |
78 // accessor methods | |
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79 inline oop object() const { return _object; } |
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80 inline oop* object_addr() { return &_object; } |
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81 inline jlong tag() const { return _tag; } |
0 | 82 |
83 inline void set_tag(jlong tag) { | |
84 assert(tag != 0, "can't be zero"); | |
85 _tag = tag; | |
86 } | |
87 | |
88 inline JvmtiTagHashmapEntry* next() const { return _next; } | |
89 inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; } | |
90 }; | |
91 | |
92 | |
93 // JvmtiTagHashmap | |
94 // | |
95 // A hashmap is essentially a table of pointers to entries. Entries | |
96 // are hashed to a location, or position in the table, and then | |
97 // chained from that location. The "key" for hashing is address of | |
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98 // the object, or oop. The "value" is the tag value. |
0 | 99 // |
100 // A hashmap maintains a count of the number entries in the hashmap | |
101 // and resizes if the number of entries exceeds a given threshold. | |
102 // The threshold is specified as a percentage of the size - for | |
103 // example a threshold of 0.75 will trigger the hashmap to resize | |
104 // if the number of entries is >75% of table size. | |
105 // | |
106 // A hashmap provides functions for adding, removing, and finding | |
107 // entries. It also provides a function to iterate over all entries | |
108 // in the hashmap. | |
109 | |
6197 | 110 class JvmtiTagHashmap : public CHeapObj<mtInternal> { |
0 | 111 private: |
112 friend class JvmtiTagMap; | |
113 | |
114 enum { | |
115 small_trace_threshold = 10000, // threshold for tracing | |
116 medium_trace_threshold = 100000, | |
117 large_trace_threshold = 1000000, | |
118 initial_trace_threshold = small_trace_threshold | |
119 }; | |
120 | |
121 static int _sizes[]; // array of possible hashmap sizes | |
122 int _size; // actual size of the table | |
123 int _size_index; // index into size table | |
124 | |
125 int _entry_count; // number of entries in the hashmap | |
126 | |
127 float _load_factor; // load factor as a % of the size | |
128 int _resize_threshold; // computed threshold to trigger resizing. | |
129 bool _resizing_enabled; // indicates if hashmap can resize | |
130 | |
131 int _trace_threshold; // threshold for trace messages | |
132 | |
133 JvmtiTagHashmapEntry** _table; // the table of entries. | |
134 | |
135 // private accessors | |
136 int resize_threshold() const { return _resize_threshold; } | |
137 int trace_threshold() const { return _trace_threshold; } | |
138 | |
139 // initialize the hashmap | |
140 void init(int size_index=0, float load_factor=4.0f) { | |
141 int initial_size = _sizes[size_index]; | |
142 _size_index = size_index; | |
143 _size = initial_size; | |
144 _entry_count = 0; | |
145 if (TraceJVMTIObjectTagging) { | |
146 _trace_threshold = initial_trace_threshold; | |
147 } else { | |
148 _trace_threshold = -1; | |
149 } | |
150 _load_factor = load_factor; | |
151 _resize_threshold = (int)(_load_factor * _size); | |
152 _resizing_enabled = true; | |
153 size_t s = initial_size * sizeof(JvmtiTagHashmapEntry*); | |
6197 | 154 _table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
0 | 155 if (_table == NULL) { |
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156 vm_exit_out_of_memory(s, OOM_MALLOC_ERROR, |
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157 "unable to allocate initial hashtable for jvmti object tags"); |
0 | 158 } |
159 for (int i=0; i<initial_size; i++) { | |
160 _table[i] = NULL; | |
161 } | |
162 } | |
163 | |
164 // hash a given key (oop) with the specified size | |
165 static unsigned int hash(oop key, int size) { | |
166 // shift right to get better distribution (as these bits will be zero | |
167 // with aligned addresses) | |
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168 unsigned int addr = (unsigned int)(cast_from_oop<intptr_t>(key)); |
0 | 169 #ifdef _LP64 |
170 return (addr >> 3) % size; | |
171 #else | |
172 return (addr >> 2) % size; | |
173 #endif | |
174 } | |
175 | |
176 // hash a given key (oop) | |
177 unsigned int hash(oop key) { | |
178 return hash(key, _size); | |
179 } | |
180 | |
181 // resize the hashmap - allocates a large table and re-hashes | |
182 // all entries into the new table. | |
183 void resize() { | |
184 int new_size_index = _size_index+1; | |
185 int new_size = _sizes[new_size_index]; | |
186 if (new_size < 0) { | |
187 // hashmap already at maximum capacity | |
188 return; | |
189 } | |
190 | |
191 // allocate new table | |
192 size_t s = new_size * sizeof(JvmtiTagHashmapEntry*); | |
6197 | 193 JvmtiTagHashmapEntry** new_table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
0 | 194 if (new_table == NULL) { |
195 warning("unable to allocate larger hashtable for jvmti object tags"); | |
196 set_resizing_enabled(false); | |
197 return; | |
198 } | |
199 | |
200 // initialize new table | |
201 int i; | |
202 for (i=0; i<new_size; i++) { | |
203 new_table[i] = NULL; | |
204 } | |
205 | |
206 // rehash all entries into the new table | |
207 for (i=0; i<_size; i++) { | |
208 JvmtiTagHashmapEntry* entry = _table[i]; | |
209 while (entry != NULL) { | |
210 JvmtiTagHashmapEntry* next = entry->next(); | |
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211 oop key = entry->object(); |
0 | 212 assert(key != NULL, "jni weak reference cleared!!"); |
213 unsigned int h = hash(key, new_size); | |
214 JvmtiTagHashmapEntry* anchor = new_table[h]; | |
215 if (anchor == NULL) { | |
216 new_table[h] = entry; | |
217 entry->set_next(NULL); | |
218 } else { | |
219 entry->set_next(anchor); | |
220 new_table[h] = entry; | |
221 } | |
222 entry = next; | |
223 } | |
224 } | |
225 | |
226 // free old table and update settings. | |
227 os::free((void*)_table); | |
228 _table = new_table; | |
229 _size_index = new_size_index; | |
230 _size = new_size; | |
231 | |
232 // compute new resize threshold | |
233 _resize_threshold = (int)(_load_factor * _size); | |
234 } | |
235 | |
236 | |
237 // internal remove function - remove an entry at a given position in the | |
238 // table. | |
239 inline void remove(JvmtiTagHashmapEntry* prev, int pos, JvmtiTagHashmapEntry* entry) { | |
240 assert(pos >= 0 && pos < _size, "out of range"); | |
241 if (prev == NULL) { | |
242 _table[pos] = entry->next(); | |
243 } else { | |
244 prev->set_next(entry->next()); | |
245 } | |
246 assert(_entry_count > 0, "checking"); | |
247 _entry_count--; | |
248 } | |
249 | |
250 // resizing switch | |
251 bool is_resizing_enabled() const { return _resizing_enabled; } | |
252 void set_resizing_enabled(bool enable) { _resizing_enabled = enable; } | |
253 | |
254 // debugging | |
255 void print_memory_usage(); | |
256 void compute_next_trace_threshold(); | |
257 | |
258 public: | |
259 | |
260 // create a JvmtiTagHashmap of a preferred size and optionally a load factor. | |
261 // The preferred size is rounded down to an actual size. | |
262 JvmtiTagHashmap(int size, float load_factor=0.0f) { | |
263 int i=0; | |
264 while (_sizes[i] < size) { | |
265 if (_sizes[i] < 0) { | |
266 assert(i > 0, "sanity check"); | |
267 i--; | |
268 break; | |
269 } | |
270 i++; | |
271 } | |
272 | |
273 // if a load factor is specified then use it, otherwise use default | |
274 if (load_factor > 0.01f) { | |
275 init(i, load_factor); | |
276 } else { | |
277 init(i); | |
278 } | |
279 } | |
280 | |
281 // create a JvmtiTagHashmap with default settings | |
282 JvmtiTagHashmap() { | |
283 init(); | |
284 } | |
285 | |
286 // release table when JvmtiTagHashmap destroyed | |
287 ~JvmtiTagHashmap() { | |
288 if (_table != NULL) { | |
289 os::free((void*)_table); | |
290 _table = NULL; | |
291 } | |
292 } | |
293 | |
294 // accessors | |
295 int size() const { return _size; } | |
296 JvmtiTagHashmapEntry** table() const { return _table; } | |
297 int entry_count() const { return _entry_count; } | |
298 | |
299 // find an entry in the hashmap, returns NULL if not found. | |
300 inline JvmtiTagHashmapEntry* find(oop key) { | |
301 unsigned int h = hash(key); | |
302 JvmtiTagHashmapEntry* entry = _table[h]; | |
303 while (entry != NULL) { | |
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304 if (entry->object() == key) { |
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305 return entry; |
0 | 306 } |
307 entry = entry->next(); | |
308 } | |
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309 return NULL; |
0 | 310 } |
311 | |
312 | |
313 // add a new entry to hashmap | |
314 inline void add(oop key, JvmtiTagHashmapEntry* entry) { | |
315 assert(key != NULL, "checking"); | |
316 assert(find(key) == NULL, "duplicate detected"); | |
317 unsigned int h = hash(key); | |
318 JvmtiTagHashmapEntry* anchor = _table[h]; | |
319 if (anchor == NULL) { | |
320 _table[h] = entry; | |
321 entry->set_next(NULL); | |
322 } else { | |
323 entry->set_next(anchor); | |
324 _table[h] = entry; | |
325 } | |
326 | |
327 _entry_count++; | |
328 if (trace_threshold() > 0 && entry_count() >= trace_threshold()) { | |
329 assert(TraceJVMTIObjectTagging, "should only get here when tracing"); | |
330 print_memory_usage(); | |
331 compute_next_trace_threshold(); | |
332 } | |
333 | |
334 // if the number of entries exceed the threshold then resize | |
335 if (entry_count() > resize_threshold() && is_resizing_enabled()) { | |
336 resize(); | |
337 } | |
338 } | |
339 | |
340 // remove an entry with the given key. | |
341 inline JvmtiTagHashmapEntry* remove(oop key) { | |
342 unsigned int h = hash(key); | |
343 JvmtiTagHashmapEntry* entry = _table[h]; | |
344 JvmtiTagHashmapEntry* prev = NULL; | |
345 while (entry != NULL) { | |
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346 if (key == entry->object()) { |
0 | 347 break; |
348 } | |
349 prev = entry; | |
350 entry = entry->next(); | |
351 } | |
352 if (entry != NULL) { | |
353 remove(prev, h, entry); | |
354 } | |
355 return entry; | |
356 } | |
357 | |
358 // iterate over all entries in the hashmap | |
359 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); | |
360 }; | |
361 | |
362 // possible hashmap sizes - odd primes that roughly double in size. | |
363 // To avoid excessive resizing the odd primes from 4801-76831 and | |
364 // 76831-307261 have been removed. The list must be terminated by -1. | |
365 int JvmtiTagHashmap::_sizes[] = { 4801, 76831, 307261, 614563, 1228891, | |
366 2457733, 4915219, 9830479, 19660831, 39321619, 78643219, -1 }; | |
367 | |
368 | |
369 // A supporting class for iterating over all entries in Hashmap | |
370 class JvmtiTagHashmapEntryClosure { | |
371 public: | |
372 virtual void do_entry(JvmtiTagHashmapEntry* entry) = 0; | |
373 }; | |
374 | |
375 | |
376 // iterate over all entries in the hashmap | |
377 void JvmtiTagHashmap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
378 for (int i=0; i<_size; i++) { | |
379 JvmtiTagHashmapEntry* entry = _table[i]; | |
380 JvmtiTagHashmapEntry* prev = NULL; | |
381 while (entry != NULL) { | |
382 // obtain the next entry before invoking do_entry - this is | |
383 // necessary because do_entry may remove the entry from the | |
384 // hashmap. | |
385 JvmtiTagHashmapEntry* next = entry->next(); | |
386 closure->do_entry(entry); | |
387 entry = next; | |
388 } | |
389 } | |
390 } | |
391 | |
392 // debugging | |
393 void JvmtiTagHashmap::print_memory_usage() { | |
394 intptr_t p = (intptr_t)this; | |
395 tty->print("[JvmtiTagHashmap @ " INTPTR_FORMAT, p); | |
396 | |
397 // table + entries in KB | |
398 int hashmap_usage = (size()*sizeof(JvmtiTagHashmapEntry*) + | |
399 entry_count()*sizeof(JvmtiTagHashmapEntry))/K; | |
400 | |
401 int weak_globals_usage = (int)(JNIHandles::weak_global_handle_memory_usage()/K); | |
402 tty->print_cr(", %d entries (%d KB) <JNI weak globals: %d KB>]", | |
403 entry_count(), hashmap_usage, weak_globals_usage); | |
404 } | |
405 | |
406 // compute threshold for the next trace message | |
407 void JvmtiTagHashmap::compute_next_trace_threshold() { | |
408 if (trace_threshold() < medium_trace_threshold) { | |
409 _trace_threshold += small_trace_threshold; | |
410 } else { | |
411 if (trace_threshold() < large_trace_threshold) { | |
412 _trace_threshold += medium_trace_threshold; | |
413 } else { | |
414 _trace_threshold += large_trace_threshold; | |
415 } | |
416 } | |
417 } | |
418 | |
419 // create a JvmtiTagMap | |
420 JvmtiTagMap::JvmtiTagMap(JvmtiEnv* env) : | |
421 _env(env), | |
422 _lock(Mutex::nonleaf+2, "JvmtiTagMap._lock", false), | |
423 _free_entries(NULL), | |
424 _free_entries_count(0) | |
425 { | |
426 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
427 assert(((JvmtiEnvBase *)env)->tag_map() == NULL, "tag map already exists for environment"); | |
428 | |
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429 _hashmap = new JvmtiTagHashmap(); |
0 | 430 |
431 // finally add us to the environment | |
432 ((JvmtiEnvBase *)env)->set_tag_map(this); | |
433 } | |
434 | |
435 | |
436 // destroy a JvmtiTagMap | |
437 JvmtiTagMap::~JvmtiTagMap() { | |
438 | |
439 // no lock acquired as we assume the enclosing environment is | |
440 // also being destroryed. | |
441 ((JvmtiEnvBase *)_env)->set_tag_map(NULL); | |
442 | |
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443 JvmtiTagHashmapEntry** table = _hashmap->table(); |
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444 for (int j = 0; j < _hashmap->size(); j++) { |
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445 JvmtiTagHashmapEntry* entry = table[j]; |
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446 while (entry != NULL) { |
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447 JvmtiTagHashmapEntry* next = entry->next(); |
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448 delete entry; |
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449 entry = next; |
0 | 450 } |
451 } | |
452 | |
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453 // finally destroy the hashmap |
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454 delete _hashmap; |
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455 _hashmap = NULL; |
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456 |
0 | 457 // remove any entries on the free list |
458 JvmtiTagHashmapEntry* entry = _free_entries; | |
459 while (entry != NULL) { | |
460 JvmtiTagHashmapEntry* next = entry->next(); | |
461 delete entry; | |
462 entry = next; | |
463 } | |
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464 _free_entries = NULL; |
0 | 465 } |
466 | |
467 // create a hashmap entry | |
468 // - if there's an entry on the (per-environment) free list then this | |
469 // is returned. Otherwise an new entry is allocated. | |
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470 JvmtiTagHashmapEntry* JvmtiTagMap::create_entry(oop ref, jlong tag) { |
0 | 471 assert(Thread::current()->is_VM_thread() || is_locked(), "checking"); |
472 JvmtiTagHashmapEntry* entry; | |
473 if (_free_entries == NULL) { | |
474 entry = new JvmtiTagHashmapEntry(ref, tag); | |
475 } else { | |
476 assert(_free_entries_count > 0, "mismatched _free_entries_count"); | |
477 _free_entries_count--; | |
478 entry = _free_entries; | |
479 _free_entries = entry->next(); | |
480 entry->init(ref, tag); | |
481 } | |
482 return entry; | |
483 } | |
484 | |
485 // destroy an entry by returning it to the free list | |
486 void JvmtiTagMap::destroy_entry(JvmtiTagHashmapEntry* entry) { | |
487 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
488 // limit the size of the free list | |
489 if (_free_entries_count >= max_free_entries) { | |
490 delete entry; | |
491 } else { | |
492 entry->set_next(_free_entries); | |
493 _free_entries = entry; | |
494 _free_entries_count++; | |
495 } | |
496 } | |
497 | |
498 // returns the tag map for the given environments. If the tag map | |
499 // doesn't exist then it is created. | |
500 JvmtiTagMap* JvmtiTagMap::tag_map_for(JvmtiEnv* env) { | |
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501 JvmtiTagMap* tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 502 if (tag_map == NULL) { |
503 MutexLocker mu(JvmtiThreadState_lock); | |
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504 tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 505 if (tag_map == NULL) { |
506 tag_map = new JvmtiTagMap(env); | |
507 } | |
508 } else { | |
509 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
510 } | |
511 return tag_map; | |
512 } | |
513 | |
514 // iterate over all entries in the tag map. | |
515 void JvmtiTagMap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
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516 hashmap()->entry_iterate(closure); |
0 | 517 } |
518 | |
519 // returns true if the hashmaps are empty | |
520 bool JvmtiTagMap::is_empty() { | |
521 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
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522 return hashmap()->entry_count() == 0; |
0 | 523 } |
524 | |
525 | |
526 // Return the tag value for an object, or 0 if the object is | |
527 // not tagged | |
528 // | |
529 static inline jlong tag_for(JvmtiTagMap* tag_map, oop o) { | |
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530 JvmtiTagHashmapEntry* entry = tag_map->hashmap()->find(o); |
0 | 531 if (entry == NULL) { |
532 return 0; | |
533 } else { | |
534 return entry->tag(); | |
535 } | |
536 } | |
537 | |
538 | |
539 // A CallbackWrapper is a support class for querying and tagging an object | |
540 // around a callback to a profiler. The constructor does pre-callback | |
541 // work to get the tag value, klass tag value, ... and the destructor | |
542 // does the post-callback work of tagging or untagging the object. | |
543 // | |
544 // { | |
545 // CallbackWrapper wrapper(tag_map, o); | |
546 // | |
547 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
548 // | |
549 // } // wrapper goes out of scope here which results in the destructor | |
550 // checking to see if the object has been tagged, untagged, or the | |
551 // tag value has changed. | |
552 // | |
553 class CallbackWrapper : public StackObj { | |
554 private: | |
555 JvmtiTagMap* _tag_map; | |
556 JvmtiTagHashmap* _hashmap; | |
557 JvmtiTagHashmapEntry* _entry; | |
558 oop _o; | |
559 jlong _obj_size; | |
560 jlong _obj_tag; | |
561 jlong _klass_tag; | |
562 | |
563 protected: | |
564 JvmtiTagMap* tag_map() const { return _tag_map; } | |
565 | |
566 // invoked post-callback to tag, untag, or update the tag of an object | |
567 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
568 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
569 public: | |
570 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
571 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
572 "MT unsafe or must be VM thread"); | |
573 | |
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574 // object to tag |
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575 _o = o; |
0 | 576 |
577 // object size | |
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578 _obj_size = (jlong)_o->size() * wordSize; |
0 | 579 |
580 // record the context | |
581 _tag_map = tag_map; | |
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582 _hashmap = tag_map->hashmap(); |
0 | 583 _entry = _hashmap->find(_o); |
584 | |
585 // get object tag | |
586 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
587 | |
588 // get the class and the class's tag value | |
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589 assert(SystemDictionary::Class_klass()->oop_is_instanceMirror(), "Is not?"); |
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590 |
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591 _klass_tag = tag_for(tag_map, _o->klass()->java_mirror()); |
0 | 592 } |
593 | |
594 ~CallbackWrapper() { | |
595 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
596 } | |
597 | |
598 inline jlong* obj_tag_p() { return &_obj_tag; } | |
599 inline jlong obj_size() const { return _obj_size; } | |
600 inline jlong obj_tag() const { return _obj_tag; } | |
601 inline jlong klass_tag() const { return _klass_tag; } | |
602 }; | |
603 | |
604 | |
605 | |
606 // callback post-callback to tag, untag, or update the tag of an object | |
607 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
608 JvmtiTagHashmap* hashmap, | |
609 JvmtiTagHashmapEntry* entry, | |
610 jlong obj_tag) { | |
611 if (entry == NULL) { | |
612 if (obj_tag != 0) { | |
613 // callback has tagged the object | |
614 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
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615 entry = tag_map()->create_entry(o, obj_tag); |
0 | 616 hashmap->add(o, entry); |
617 } | |
618 } else { | |
619 // object was previously tagged - the callback may have untagged | |
620 // the object or changed the tag value | |
621 if (obj_tag == 0) { | |
622 | |
623 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
624 assert(entry_removed == entry, "checking"); | |
625 tag_map()->destroy_entry(entry); | |
626 | |
627 } else { | |
628 if (obj_tag != entry->tag()) { | |
629 entry->set_tag(obj_tag); | |
630 } | |
631 } | |
632 } | |
633 } | |
634 | |
635 // An extended CallbackWrapper used when reporting an object reference | |
636 // to the agent. | |
637 // | |
638 // { | |
639 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
640 // | |
641 // (*callback)(wrapper.klass_tag(), | |
642 // wrapper.obj_size(), | |
643 // wrapper.obj_tag_p() | |
644 // wrapper.referrer_tag_p(), ...) | |
645 // | |
646 // } // wrapper goes out of scope here which results in the destructor | |
647 // checking to see if the referrer object has been tagged, untagged, | |
648 // or the tag value has changed. | |
649 // | |
650 class TwoOopCallbackWrapper : public CallbackWrapper { | |
651 private: | |
652 bool _is_reference_to_self; | |
653 JvmtiTagHashmap* _referrer_hashmap; | |
654 JvmtiTagHashmapEntry* _referrer_entry; | |
655 oop _referrer; | |
656 jlong _referrer_obj_tag; | |
657 jlong _referrer_klass_tag; | |
658 jlong* _referrer_tag_p; | |
659 | |
660 bool is_reference_to_self() const { return _is_reference_to_self; } | |
661 | |
662 public: | |
663 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
664 CallbackWrapper(tag_map, o) | |
665 { | |
666 // self reference needs to be handled in a special way | |
667 _is_reference_to_self = (referrer == o); | |
668 | |
669 if (_is_reference_to_self) { | |
670 _referrer_klass_tag = klass_tag(); | |
671 _referrer_tag_p = obj_tag_p(); | |
672 } else { | |
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673 _referrer = referrer; |
0 | 674 // record the context |
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675 _referrer_hashmap = tag_map->hashmap(); |
0 | 676 _referrer_entry = _referrer_hashmap->find(_referrer); |
677 | |
678 // get object tag | |
679 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
680 _referrer_tag_p = &_referrer_obj_tag; | |
681 | |
682 // get referrer class tag. | |
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683 _referrer_klass_tag = tag_for(tag_map, _referrer->klass()->java_mirror()); |
0 | 684 } |
685 } | |
686 | |
687 ~TwoOopCallbackWrapper() { | |
688 if (!is_reference_to_self()){ | |
689 post_callback_tag_update(_referrer, | |
690 _referrer_hashmap, | |
691 _referrer_entry, | |
692 _referrer_obj_tag); | |
693 } | |
694 } | |
695 | |
696 // address of referrer tag | |
697 // (for a self reference this will return the same thing as obj_tag_p()) | |
698 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
699 | |
700 // referrer's class tag | |
701 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
702 }; | |
703 | |
704 // tag an object | |
705 // | |
706 // This function is performance critical. If many threads attempt to tag objects | |
707 // around the same time then it's possible that the Mutex associated with the | |
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708 // tag map will be a hot lock. |
0 | 709 void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
710 MutexLocker ml(lock()); | |
711 | |
712 // resolve the object | |
713 oop o = JNIHandles::resolve_non_null(object); | |
714 | |
715 // see if the object is already tagged | |
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716 JvmtiTagHashmap* hashmap = _hashmap; |
0 | 717 JvmtiTagHashmapEntry* entry = hashmap->find(o); |
718 | |
719 // if the object is not already tagged then we tag it | |
720 if (entry == NULL) { | |
721 if (tag != 0) { | |
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722 entry = create_entry(o, tag); |
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723 hashmap->add(o, entry); |
0 | 724 } else { |
725 // no-op | |
726 } | |
727 } else { | |
728 // if the object is already tagged then we either update | |
729 // the tag (if a new tag value has been provided) | |
730 // or remove the object if the new tag value is 0. | |
731 if (tag == 0) { | |
732 hashmap->remove(o); | |
733 destroy_entry(entry); | |
734 } else { | |
735 entry->set_tag(tag); | |
736 } | |
737 } | |
738 } | |
739 | |
740 // get the tag for an object | |
741 jlong JvmtiTagMap::get_tag(jobject object) { | |
742 MutexLocker ml(lock()); | |
743 | |
744 // resolve the object | |
745 oop o = JNIHandles::resolve_non_null(object); | |
746 | |
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747 return tag_for(this, o); |
0 | 748 } |
749 | |
750 | |
751 // Helper class used to describe the static or instance fields of a class. | |
752 // For each field it holds the field index (as defined by the JVMTI specification), | |
753 // the field type, and the offset. | |
754 | |
6197 | 755 class ClassFieldDescriptor: public CHeapObj<mtInternal> { |
0 | 756 private: |
757 int _field_index; | |
758 int _field_offset; | |
759 char _field_type; | |
760 public: | |
761 ClassFieldDescriptor(int index, char type, int offset) : | |
762 _field_index(index), _field_type(type), _field_offset(offset) { | |
763 } | |
764 int field_index() const { return _field_index; } | |
765 char field_type() const { return _field_type; } | |
766 int field_offset() const { return _field_offset; } | |
767 }; | |
768 | |
6197 | 769 class ClassFieldMap: public CHeapObj<mtInternal> { |
0 | 770 private: |
771 enum { | |
772 initial_field_count = 5 | |
773 }; | |
774 | |
775 // list of field descriptors | |
776 GrowableArray<ClassFieldDescriptor*>* _fields; | |
777 | |
778 // constructor | |
779 ClassFieldMap(); | |
780 | |
781 // add a field | |
782 void add(int index, char type, int offset); | |
783 | |
784 // returns the field count for the given class | |
785 static int compute_field_count(instanceKlassHandle ikh); | |
786 | |
787 public: | |
788 ~ClassFieldMap(); | |
789 | |
790 // access | |
791 int field_count() { return _fields->length(); } | |
792 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
793 | |
794 // functions to create maps of static or instance fields | |
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795 static ClassFieldMap* create_map_of_static_fields(Klass* k); |
0 | 796 static ClassFieldMap* create_map_of_instance_fields(oop obj); |
797 }; | |
798 | |
799 ClassFieldMap::ClassFieldMap() { | |
6197 | 800 _fields = new (ResourceObj::C_HEAP, mtInternal) |
801 GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
0 | 802 } |
803 | |
804 ClassFieldMap::~ClassFieldMap() { | |
805 for (int i=0; i<_fields->length(); i++) { | |
806 delete _fields->at(i); | |
807 } | |
808 delete _fields; | |
809 } | |
810 | |
811 void ClassFieldMap::add(int index, char type, int offset) { | |
812 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
813 _fields->append(field); | |
814 } | |
815 | |
816 // Returns a heap allocated ClassFieldMap to describe the static fields | |
817 // of the given class. | |
818 // | |
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819 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(Klass* k) { |
0 | 820 HandleMark hm; |
821 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
822 | |
823 // create the field map | |
824 ClassFieldMap* field_map = new ClassFieldMap(); | |
825 | |
826 FilteredFieldStream f(ikh, false, false); | |
827 int max_field_index = f.field_count()-1; | |
828 | |
829 int index = 0; | |
830 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
831 // ignore instance fields | |
832 if (!fld.access_flags().is_static()) { | |
833 continue; | |
834 } | |
835 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
836 } | |
837 return field_map; | |
838 } | |
839 | |
840 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
841 // of the given class. All instance fields are included (this means public | |
842 // and private fields declared in superclasses and superinterfaces too). | |
843 // | |
844 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
845 HandleMark hm; | |
846 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
847 | |
848 // create the field map | |
849 ClassFieldMap* field_map = new ClassFieldMap(); | |
850 | |
851 FilteredFieldStream f(ikh, false, false); | |
852 | |
853 int max_field_index = f.field_count()-1; | |
854 | |
855 int index = 0; | |
856 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
857 // ignore static fields | |
858 if (fld.access_flags().is_static()) { | |
859 continue; | |
860 } | |
861 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
862 } | |
863 | |
864 return field_map; | |
865 } | |
866 | |
867 // Helper class used to cache a ClassFileMap for the instance fields of | |
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868 // a cache. A JvmtiCachedClassFieldMap can be cached by an InstanceKlass during |
0 | 869 // heap iteration and avoid creating a field map for each object in the heap |
870 // (only need to create the map when the first instance of a class is encountered). | |
871 // | |
6197 | 872 class JvmtiCachedClassFieldMap : public CHeapObj<mtInternal> { |
0 | 873 private: |
874 enum { | |
875 initial_class_count = 200 | |
876 }; | |
877 ClassFieldMap* _field_map; | |
878 | |
879 ClassFieldMap* field_map() const { return _field_map; } | |
880 | |
881 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
882 ~JvmtiCachedClassFieldMap(); | |
883 | |
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884 static GrowableArray<InstanceKlass*>* _class_list; |
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885 static void add_to_class_list(InstanceKlass* ik); |
0 | 886 |
887 public: | |
888 // returns the field map for a given object (returning map cached | |
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889 // by InstanceKlass if possible |
0 | 890 static ClassFieldMap* get_map_of_instance_fields(oop obj); |
891 | |
892 // removes the field map from all instanceKlasses - should be | |
893 // called before VM operation completes | |
894 static void clear_cache(); | |
895 | |
896 // returns the number of ClassFieldMap cached by instanceKlasses | |
897 static int cached_field_map_count(); | |
898 }; | |
899 | |
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900 GrowableArray<InstanceKlass*>* JvmtiCachedClassFieldMap::_class_list; |
0 | 901 |
902 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
903 _field_map = field_map; | |
904 } | |
905 | |
906 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
907 if (_field_map != NULL) { | |
908 delete _field_map; | |
909 } | |
910 } | |
911 | |
912 // Marker class to ensure that the class file map cache is only used in a defined | |
913 // scope. | |
914 class ClassFieldMapCacheMark : public StackObj { | |
915 private: | |
916 static bool _is_active; | |
917 public: | |
918 ClassFieldMapCacheMark() { | |
919 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
920 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
921 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
922 _is_active = true; | |
923 } | |
924 ~ClassFieldMapCacheMark() { | |
925 JvmtiCachedClassFieldMap::clear_cache(); | |
926 _is_active = false; | |
927 } | |
928 static bool is_active() { return _is_active; } | |
929 }; | |
930 | |
931 bool ClassFieldMapCacheMark::_is_active; | |
932 | |
933 | |
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934 // record that the given InstanceKlass is caching a field map |
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935 void JvmtiCachedClassFieldMap::add_to_class_list(InstanceKlass* ik) { |
0 | 936 if (_class_list == NULL) { |
6197 | 937 _class_list = new (ResourceObj::C_HEAP, mtInternal) |
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938 GrowableArray<InstanceKlass*>(initial_class_count, true); |
0 | 939 } |
940 _class_list->push(ik); | |
941 } | |
942 | |
943 // returns the instance field map for the given object | |
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944 // (returns field map cached by the InstanceKlass if possible) |
0 | 945 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { |
946 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
947 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
948 | |
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949 Klass* k = obj->klass(); |
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950 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 951 |
952 // return cached map if possible | |
953 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
954 if (cached_map != NULL) { | |
955 assert(cached_map->field_map() != NULL, "missing field list"); | |
956 return cached_map->field_map(); | |
957 } else { | |
958 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
959 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
960 ik->set_jvmti_cached_class_field_map(cached_map); | |
961 add_to_class_list(ik); | |
962 return field_map; | |
963 } | |
964 } | |
965 | |
966 // remove the fields maps cached from all instanceKlasses | |
967 void JvmtiCachedClassFieldMap::clear_cache() { | |
968 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
969 if (_class_list != NULL) { | |
970 for (int i = 0; i < _class_list->length(); i++) { | |
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971 InstanceKlass* ik = _class_list->at(i); |
0 | 972 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); |
973 assert(cached_map != NULL, "should not be NULL"); | |
974 ik->set_jvmti_cached_class_field_map(NULL); | |
975 delete cached_map; // deletes the encapsulated field map | |
976 } | |
977 delete _class_list; | |
978 _class_list = NULL; | |
979 } | |
980 } | |
981 | |
982 // returns the number of ClassFieldMap cached by instanceKlasses | |
983 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
984 return (_class_list == NULL) ? 0 : _class_list->length(); | |
985 } | |
986 | |
987 // helper function to indicate if an object is filtered by its tag or class tag | |
988 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
989 jlong klass_tag, | |
990 int heap_filter) { | |
991 // apply the heap filter | |
992 if (obj_tag != 0) { | |
993 // filter out tagged objects | |
994 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
995 } else { | |
996 // filter out untagged objects | |
997 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
998 } | |
999 if (klass_tag != 0) { | |
1000 // filter out objects with tagged classes | |
1001 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
1002 } else { | |
1003 // filter out objects with untagged classes. | |
1004 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
1005 } | |
1006 return false; | |
1007 } | |
1008 | |
1009 // helper function to indicate if an object is filtered by a klass filter | |
1010 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
1011 if (!klass_filter.is_null()) { | |
1012 if (obj->klass() != klass_filter()) { | |
1013 return true; | |
1014 } | |
1015 } | |
1016 return false; | |
1017 } | |
1018 | |
1019 // helper function to tell if a field is a primitive field or not | |
1020 static inline bool is_primitive_field_type(char type) { | |
1021 return (type != 'L' && type != '['); | |
1022 } | |
1023 | |
1024 // helper function to copy the value from location addr to jvalue. | |
1025 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
1026 switch (value_type) { | |
1027 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
1028 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
1029 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
1030 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
1031 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
1032 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
1033 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
1034 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
1035 default: ShouldNotReachHere(); | |
1036 } | |
1037 } | |
1038 | |
1039 // helper function to invoke string primitive value callback | |
1040 // returns visit control flags | |
1041 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
1042 CallbackWrapper* wrapper, | |
1043 oop str, | |
1044 void* user_data) | |
1045 { | |
1142 | 1046 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 1047 |
1048 // get the string value and length | |
1049 // (string value may be offset from the base) | |
1050 int s_len = java_lang_String::length(str); | |
1051 typeArrayOop s_value = java_lang_String::value(str); | |
1052 int s_offset = java_lang_String::offset(str); | |
1053 jchar* value; | |
1054 if (s_len > 0) { | |
1055 value = s_value->char_at_addr(s_offset); | |
1056 } else { | |
1057 value = (jchar*) s_value->base(T_CHAR); | |
1058 } | |
1059 | |
1060 // invoke the callback | |
1061 return (*cb)(wrapper->klass_tag(), | |
1062 wrapper->obj_size(), | |
1063 wrapper->obj_tag_p(), | |
1064 value, | |
1065 (jint)s_len, | |
1066 user_data); | |
1067 } | |
1068 | |
1069 // helper function to invoke string primitive value callback | |
1070 // returns visit control flags | |
1071 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
1072 CallbackWrapper* wrapper, | |
1073 oop obj, | |
1074 void* user_data) | |
1075 { | |
1076 assert(obj->is_typeArray(), "not a primitive array"); | |
1077 | |
1078 // get base address of first element | |
1079 typeArrayOop array = typeArrayOop(obj); | |
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1080 BasicType type = TypeArrayKlass::cast(array->klass())->element_type(); |
0 | 1081 void* elements = array->base(type); |
1082 | |
1083 // jvmtiPrimitiveType is defined so this mapping is always correct | |
1084 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
1085 | |
1086 return (*cb)(wrapper->klass_tag(), | |
1087 wrapper->obj_size(), | |
1088 wrapper->obj_tag_p(), | |
1089 (jint)array->length(), | |
1090 elem_type, | |
1091 elements, | |
1092 user_data); | |
1093 } | |
1094 | |
1095 // helper function to invoke the primitive field callback for all static fields | |
1096 // of a given class | |
1097 static jint invoke_primitive_field_callback_for_static_fields | |
1098 (CallbackWrapper* wrapper, | |
1099 oop obj, | |
1100 jvmtiPrimitiveFieldCallback cb, | |
1101 void* user_data) | |
1102 { | |
1103 // for static fields only the index will be set | |
1104 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1105 | |
1142 | 1106 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
0 | 1107 if (java_lang_Class::is_primitive(obj)) { |
1108 return 0; | |
1109 } | |
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1110 Klass* klass = java_lang_Class::as_Klass(obj); |
0 | 1111 |
1112 // ignore classes for object and type arrays | |
1113 if (!klass->oop_is_instance()) { | |
1114 return 0; | |
1115 } | |
1116 | |
1117 // ignore classes which aren't linked yet | |
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1118 InstanceKlass* ik = InstanceKlass::cast(klass); |
0 | 1119 if (!ik->is_linked()) { |
1120 return 0; | |
1121 } | |
1122 | |
1123 // get the field map | |
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1124 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
0 | 1125 |
1126 // invoke the callback for each static primitive field | |
1127 for (int i=0; i<field_map->field_count(); i++) { | |
1128 ClassFieldDescriptor* field = field_map->field_at(i); | |
1129 | |
1130 // ignore non-primitive fields | |
1131 char type = field->field_type(); | |
1132 if (!is_primitive_field_type(type)) { | |
1133 continue; | |
1134 } | |
1135 // one-to-one mapping | |
1136 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1137 | |
1138 // get offset and field value | |
1139 int offset = field->field_offset(); | |
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1140 address addr = (address)klass->java_mirror() + offset; |
0 | 1141 jvalue value; |
1142 copy_to_jvalue(&value, addr, value_type); | |
1143 | |
1144 // field index | |
1145 reference_info.field.index = field->field_index(); | |
1146 | |
1147 // invoke the callback | |
1148 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
1149 &reference_info, | |
1150 wrapper->klass_tag(), | |
1151 wrapper->obj_tag_p(), | |
1152 value, | |
1153 value_type, | |
1154 user_data); | |
1155 if (res & JVMTI_VISIT_ABORT) { | |
1156 delete field_map; | |
1157 return res; | |
1158 } | |
1159 } | |
1160 | |
1161 delete field_map; | |
1162 return 0; | |
1163 } | |
1164 | |
1165 // helper function to invoke the primitive field callback for all instance fields | |
1166 // of a given object | |
1167 static jint invoke_primitive_field_callback_for_instance_fields( | |
1168 CallbackWrapper* wrapper, | |
1169 oop obj, | |
1170 jvmtiPrimitiveFieldCallback cb, | |
1171 void* user_data) | |
1172 { | |
1173 // for instance fields only the index will be set | |
1174 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1175 | |
1176 // get the map of the instance fields | |
1177 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
1178 | |
1179 // invoke the callback for each instance primitive field | |
1180 for (int i=0; i<fields->field_count(); i++) { | |
1181 ClassFieldDescriptor* field = fields->field_at(i); | |
1182 | |
1183 // ignore non-primitive fields | |
1184 char type = field->field_type(); | |
1185 if (!is_primitive_field_type(type)) { | |
1186 continue; | |
1187 } | |
1188 // one-to-one mapping | |
1189 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1190 | |
1191 // get offset and field value | |
1192 int offset = field->field_offset(); | |
1193 address addr = (address)obj + offset; | |
1194 jvalue value; | |
1195 copy_to_jvalue(&value, addr, value_type); | |
1196 | |
1197 // field index | |
1198 reference_info.field.index = field->field_index(); | |
1199 | |
1200 // invoke the callback | |
1201 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
1202 &reference_info, | |
1203 wrapper->klass_tag(), | |
1204 wrapper->obj_tag_p(), | |
1205 value, | |
1206 value_type, | |
1207 user_data); | |
1208 if (res & JVMTI_VISIT_ABORT) { | |
1209 return res; | |
1210 } | |
1211 } | |
1212 return 0; | |
1213 } | |
1214 | |
1215 | |
1216 // VM operation to iterate over all objects in the heap (both reachable | |
1217 // and unreachable) | |
1218 class VM_HeapIterateOperation: public VM_Operation { | |
1219 private: | |
1220 ObjectClosure* _blk; | |
1221 public: | |
1222 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
1223 | |
1224 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
1225 void doit() { | |
1226 // allows class files maps to be cached during iteration | |
1227 ClassFieldMapCacheMark cm; | |
1228 | |
1229 // make sure that heap is parsable (fills TLABs with filler objects) | |
1230 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1231 | |
1232 // Verify heap before iteration - if the heap gets corrupted then | |
1233 // JVMTI's IterateOverHeap will crash. | |
1234 if (VerifyBeforeIteration) { | |
1235 Universe::verify(); | |
1236 } | |
1237 | |
1238 // do the iteration | |
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1239 // If this operation encounters a bad object when using CMS, |
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1240 // consider using safe_object_iterate() which avoids perm gen |
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1241 // objects that may contain bad references. |
0 | 1242 Universe::heap()->object_iterate(_blk); |
1243 } | |
1244 | |
1245 }; | |
1246 | |
1247 | |
1248 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
1249 // IterateOverInstancesOfClass functions | |
1250 class IterateOverHeapObjectClosure: public ObjectClosure { | |
1251 private: | |
1252 JvmtiTagMap* _tag_map; | |
1253 KlassHandle _klass; | |
1254 jvmtiHeapObjectFilter _object_filter; | |
1255 jvmtiHeapObjectCallback _heap_object_callback; | |
1256 const void* _user_data; | |
1257 | |
1258 // accessors | |
1259 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1260 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
1261 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
1262 KlassHandle klass() const { return _klass; } | |
1263 const void* user_data() const { return _user_data; } | |
1264 | |
1265 // indicates if iteration has been aborted | |
1266 bool _iteration_aborted; | |
1267 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1268 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
1269 | |
1270 public: | |
1271 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
1272 KlassHandle klass, | |
1273 jvmtiHeapObjectFilter object_filter, | |
1274 jvmtiHeapObjectCallback heap_object_callback, | |
1275 const void* user_data) : | |
1276 _tag_map(tag_map), | |
1277 _klass(klass), | |
1278 _object_filter(object_filter), | |
1279 _heap_object_callback(heap_object_callback), | |
1280 _user_data(user_data), | |
1281 _iteration_aborted(false) | |
1282 { | |
1283 } | |
1284 | |
1285 void do_object(oop o); | |
1286 }; | |
1287 | |
1288 // invoked for each object in the heap | |
1289 void IterateOverHeapObjectClosure::do_object(oop o) { | |
1290 // check if iteration has been halted | |
1291 if (is_iteration_aborted()) return; | |
1292 | |
1293 // ignore any objects that aren't visible to profiler | |
1294 if (!ServiceUtil::visible_oop(o)) return; | |
1295 | |
1296 // instanceof check when filtering by klass | |
1297 if (!klass().is_null() && !o->is_a(klass()())) { | |
1298 return; | |
1299 } | |
1300 // prepare for the calllback | |
1301 CallbackWrapper wrapper(tag_map(), o); | |
1302 | |
1303 // if the object is tagged and we're only interested in untagged objects | |
1304 // then don't invoke the callback. Similiarly, if the object is untagged | |
1305 // and we're only interested in tagged objects we skip the callback. | |
1306 if (wrapper.obj_tag() != 0) { | |
1307 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
1308 } else { | |
1309 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
1310 } | |
1311 | |
1312 // invoke the agent's callback | |
1313 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
1314 wrapper.obj_size(), | |
1315 wrapper.obj_tag_p(), | |
1316 (void*)user_data()); | |
1317 if (control == JVMTI_ITERATION_ABORT) { | |
1318 set_iteration_aborted(true); | |
1319 } | |
1320 } | |
1321 | |
1322 // An ObjectClosure used to support the IterateThroughHeap function | |
1323 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
1324 private: | |
1325 JvmtiTagMap* _tag_map; | |
1326 KlassHandle _klass; | |
1327 int _heap_filter; | |
1328 const jvmtiHeapCallbacks* _callbacks; | |
1329 const void* _user_data; | |
1330 | |
1331 // accessor functions | |
1332 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1333 int heap_filter() const { return _heap_filter; } | |
1334 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
1335 KlassHandle klass() const { return _klass; } | |
1336 const void* user_data() const { return _user_data; } | |
1337 | |
1338 // indicates if the iteration has been aborted | |
1339 bool _iteration_aborted; | |
1340 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1341 | |
1342 // used to check the visit control flags. If the abort flag is set | |
1343 // then we set the iteration aborted flag so that the iteration completes | |
1344 // without processing any further objects | |
1345 bool check_flags_for_abort(jint flags) { | |
1346 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
1347 if (is_abort) { | |
1348 _iteration_aborted = true; | |
1349 } | |
1350 return is_abort; | |
1351 } | |
1352 | |
1353 public: | |
1354 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
1355 KlassHandle klass, | |
1356 int heap_filter, | |
1357 const jvmtiHeapCallbacks* heap_callbacks, | |
1358 const void* user_data) : | |
1359 _tag_map(tag_map), | |
1360 _klass(klass), | |
1361 _heap_filter(heap_filter), | |
1362 _callbacks(heap_callbacks), | |
1363 _user_data(user_data), | |
1364 _iteration_aborted(false) | |
1365 { | |
1366 } | |
1367 | |
1368 void do_object(oop o); | |
1369 }; | |
1370 | |
1371 // invoked for each object in the heap | |
1372 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
1373 // check if iteration has been halted | |
1374 if (is_iteration_aborted()) return; | |
1375 | |
1376 // ignore any objects that aren't visible to profiler | |
1377 if (!ServiceUtil::visible_oop(obj)) return; | |
1378 | |
1379 // apply class filter | |
1380 if (is_filtered_by_klass_filter(obj, klass())) return; | |
1381 | |
1382 // prepare for callback | |
1383 CallbackWrapper wrapper(tag_map(), obj); | |
1384 | |
1385 // check if filtered by the heap filter | |
1386 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
1387 return; | |
1388 } | |
1389 | |
1390 // for arrays we need the length, otherwise -1 | |
1391 bool is_array = obj->is_array(); | |
1392 int len = is_array ? arrayOop(obj)->length() : -1; | |
1393 | |
1394 // invoke the object callback (if callback is provided) | |
1395 if (callbacks()->heap_iteration_callback != NULL) { | |
1396 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
1397 jint res = (*cb)(wrapper.klass_tag(), | |
1398 wrapper.obj_size(), | |
1399 wrapper.obj_tag_p(), | |
1400 (jint)len, | |
1401 (void*)user_data()); | |
1402 if (check_flags_for_abort(res)) return; | |
1403 } | |
1404 | |
1405 // for objects and classes we report primitive fields if callback provided | |
1406 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
1407 jint res; | |
1408 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
1142 | 1409 if (obj->klass() == SystemDictionary::Class_klass()) { |
0 | 1410 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
1411 obj, | |
1412 cb, | |
1413 (void*)user_data()); | |
1414 } else { | |
1415 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
1416 obj, | |
1417 cb, | |
1418 (void*)user_data()); | |
1419 } | |
1420 if (check_flags_for_abort(res)) return; | |
1421 } | |
1422 | |
1423 // string callback | |
1424 if (!is_array && | |
1425 callbacks()->string_primitive_value_callback != NULL && | |
1142 | 1426 obj->klass() == SystemDictionary::String_klass()) { |
0 | 1427 jint res = invoke_string_value_callback( |
1428 callbacks()->string_primitive_value_callback, | |
1429 &wrapper, | |
1430 obj, | |
1431 (void*)user_data() ); | |
1432 if (check_flags_for_abort(res)) return; | |
1433 } | |
1434 | |
1435 // array callback | |
1436 if (is_array && | |
1437 callbacks()->array_primitive_value_callback != NULL && | |
1438 obj->is_typeArray()) { | |
1439 jint res = invoke_array_primitive_value_callback( | |
1440 callbacks()->array_primitive_value_callback, | |
1441 &wrapper, | |
1442 obj, | |
1443 (void*)user_data() ); | |
1444 if (check_flags_for_abort(res)) return; | |
1445 } | |
1446 }; | |
1447 | |
1448 | |
1449 // Deprecated function to iterate over all objects in the heap | |
1450 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
1451 KlassHandle klass, | |
1452 jvmtiHeapObjectCallback heap_object_callback, | |
1453 const void* user_data) | |
1454 { | |
1455 MutexLocker ml(Heap_lock); | |
1456 IterateOverHeapObjectClosure blk(this, | |
1457 klass, | |
1458 object_filter, | |
1459 heap_object_callback, | |
1460 user_data); | |
1461 VM_HeapIterateOperation op(&blk); | |
1462 VMThread::execute(&op); | |
1463 } | |
1464 | |
1465 | |
1466 // Iterates over all objects in the heap | |
1467 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
1468 KlassHandle klass, | |
1469 const jvmtiHeapCallbacks* callbacks, | |
1470 const void* user_data) | |
1471 { | |
1472 MutexLocker ml(Heap_lock); | |
1473 IterateThroughHeapObjectClosure blk(this, | |
1474 klass, | |
1475 heap_filter, | |
1476 callbacks, | |
1477 user_data); | |
1478 VM_HeapIterateOperation op(&blk); | |
1479 VMThread::execute(&op); | |
1480 } | |
1481 | |
1482 // support class for get_objects_with_tags | |
1483 | |
1484 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
1485 private: | |
1486 JvmtiEnv* _env; | |
1487 jlong* _tags; | |
1488 jint _tag_count; | |
1489 | |
1490 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
1491 GrowableArray<uint64_t>* _tag_results; // collected tags | |
1492 | |
1493 public: | |
1494 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
1495 _env = env; | |
1496 _tags = (jlong*)tags; | |
1497 _tag_count = tag_count; | |
6197 | 1498 _object_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jobject>(1,true); |
1499 _tag_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<uint64_t>(1,true); | |
0 | 1500 } |
1501 | |
1502 ~TagObjectCollector() { | |
1503 delete _object_results; | |
1504 delete _tag_results; | |
1505 } | |
1506 | |
1507 // for each tagged object check if the tag value matches | |
1508 // - if it matches then we create a JNI local reference to the object | |
1509 // and record the reference and tag value. | |
1510 // | |
1511 void do_entry(JvmtiTagHashmapEntry* entry) { | |
1512 for (int i=0; i<_tag_count; i++) { | |
1513 if (_tags[i] == entry->tag()) { | |
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1514 oop o = entry->object(); |
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1515 assert(o != NULL && Universe::heap()->is_in_reserved(o), "sanity check"); |
0 | 1516 jobject ref = JNIHandles::make_local(JavaThread::current(), o); |
1517 _object_results->append(ref); | |
1518 _tag_results->append((uint64_t)entry->tag()); | |
1519 } | |
1520 } | |
1521 } | |
1522 | |
1523 // return the results from the collection | |
1524 // | |
1525 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1526 jvmtiError error; | |
1527 int count = _object_results->length(); | |
1528 assert(count >= 0, "sanity check"); | |
1529 | |
1530 // if object_result_ptr is not NULL then allocate the result and copy | |
1531 // in the object references. | |
1532 if (object_result_ptr != NULL) { | |
1533 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
1534 if (error != JVMTI_ERROR_NONE) { | |
1535 return error; | |
1536 } | |
1537 for (int i=0; i<count; i++) { | |
1538 (*object_result_ptr)[i] = _object_results->at(i); | |
1539 } | |
1540 } | |
1541 | |
1542 // if tag_result_ptr is not NULL then allocate the result and copy | |
1543 // in the tag values. | |
1544 if (tag_result_ptr != NULL) { | |
1545 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
1546 if (error != JVMTI_ERROR_NONE) { | |
1547 if (object_result_ptr != NULL) { | |
1548 _env->Deallocate((unsigned char*)object_result_ptr); | |
1549 } | |
1550 return error; | |
1551 } | |
1552 for (int i=0; i<count; i++) { | |
1553 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
1554 } | |
1555 } | |
1556 | |
1557 *count_ptr = count; | |
1558 return JVMTI_ERROR_NONE; | |
1559 } | |
1560 }; | |
1561 | |
1562 // return the list of objects with the specified tags | |
1563 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
1564 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1565 | |
1566 TagObjectCollector collector(env(), tags, count); | |
1567 { | |
1568 // iterate over all tagged objects | |
1569 MutexLocker ml(lock()); | |
1570 entry_iterate(&collector); | |
1571 } | |
1572 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
1573 } | |
1574 | |
1575 | |
1576 // ObjectMarker is used to support the marking objects when walking the | |
1577 // heap. | |
1578 // | |
1579 // This implementation uses the existing mark bits in an object for | |
1580 // marking. Objects that are marked must later have their headers restored. | |
1581 // As most objects are unlocked and don't have their identity hash computed | |
1582 // we don't have to save their headers. Instead we save the headers that | |
1583 // are "interesting". Later when the headers are restored this implementation | |
1584 // restores all headers to their initial value and then restores the few | |
1585 // objects that had interesting headers. | |
1586 // | |
1587 // Future work: This implementation currently uses growable arrays to save | |
1588 // the oop and header of interesting objects. As an optimization we could | |
1589 // use the same technique as the GC and make use of the unused area | |
1590 // between top() and end(). | |
1591 // | |
1592 | |
1593 // An ObjectClosure used to restore the mark bits of an object | |
1594 class RestoreMarksClosure : public ObjectClosure { | |
1595 public: | |
1596 void do_object(oop o) { | |
1597 if (o != NULL) { | |
1598 markOop mark = o->mark(); | |
1599 if (mark->is_marked()) { | |
1600 o->init_mark(); | |
1601 } | |
1602 } | |
1603 } | |
1604 }; | |
1605 | |
1606 // ObjectMarker provides the mark and visited functions | |
1607 class ObjectMarker : AllStatic { | |
1608 private: | |
1609 // saved headers | |
1610 static GrowableArray<oop>* _saved_oop_stack; | |
1611 static GrowableArray<markOop>* _saved_mark_stack; | |
3815 | 1612 static bool _needs_reset; // do we need to reset mark bits? |
0 | 1613 |
1614 public: | |
1615 static void init(); // initialize | |
1616 static void done(); // clean-up | |
1617 | |
1618 static inline void mark(oop o); // mark an object | |
1619 static inline bool visited(oop o); // check if object has been visited | |
3815 | 1620 |
1621 static inline bool needs_reset() { return _needs_reset; } | |
1622 static inline void set_needs_reset(bool v) { _needs_reset = v; } | |
0 | 1623 }; |
1624 | |
1625 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
1626 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
3815 | 1627 bool ObjectMarker::_needs_reset = true; // need to reset mark bits by default |
0 | 1628 |
1629 // initialize ObjectMarker - prepares for object marking | |
1630 void ObjectMarker::init() { | |
1631 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
1632 | |
1633 // prepare heap for iteration | |
1634 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1635 | |
1636 // create stacks for interesting headers | |
6197 | 1637 _saved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markOop>(4000, true); |
1638 _saved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(4000, true); | |
0 | 1639 |
1640 if (UseBiasedLocking) { | |
1641 BiasedLocking::preserve_marks(); | |
1642 } | |
1643 } | |
1644 | |
1645 // Object marking is done so restore object headers | |
1646 void ObjectMarker::done() { | |
1647 // iterate over all objects and restore the mark bits to | |
1648 // their initial value | |
1649 RestoreMarksClosure blk; | |
3815 | 1650 if (needs_reset()) { |
1651 Universe::heap()->object_iterate(&blk); | |
1652 } else { | |
1653 // We don't need to reset mark bits on this call, but reset the | |
1654 // flag to the default for the next call. | |
1655 set_needs_reset(true); | |
1656 } | |
0 | 1657 |
1658 // now restore the interesting headers | |
1659 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
1660 oop o = _saved_oop_stack->at(i); | |
1661 markOop mark = _saved_mark_stack->at(i); | |
1662 o->set_mark(mark); | |
1663 } | |
1664 | |
1665 if (UseBiasedLocking) { | |
1666 BiasedLocking::restore_marks(); | |
1667 } | |
1668 | |
1669 // free the stacks | |
1670 delete _saved_oop_stack; | |
1671 delete _saved_mark_stack; | |
1672 } | |
1673 | |
1674 // mark an object | |
1675 inline void ObjectMarker::mark(oop o) { | |
1676 assert(Universe::heap()->is_in(o), "sanity check"); | |
1677 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
1678 | |
1679 // object's mark word | |
1680 markOop mark = o->mark(); | |
1681 | |
1682 if (mark->must_be_preserved(o)) { | |
1683 _saved_mark_stack->push(mark); | |
1684 _saved_oop_stack->push(o); | |
1685 } | |
1686 | |
1687 // mark the object | |
1688 o->set_mark(markOopDesc::prototype()->set_marked()); | |
1689 } | |
1690 | |
1691 // return true if object is marked | |
1692 inline bool ObjectMarker::visited(oop o) { | |
1693 return o->mark()->is_marked(); | |
1694 } | |
1695 | |
1696 // Stack allocated class to help ensure that ObjectMarker is used | |
1697 // correctly. Constructor initializes ObjectMarker, destructor calls | |
1698 // ObjectMarker's done() function to restore object headers. | |
1699 class ObjectMarkerController : public StackObj { | |
1700 public: | |
1701 ObjectMarkerController() { | |
1702 ObjectMarker::init(); | |
1703 } | |
1704 ~ObjectMarkerController() { | |
1705 ObjectMarker::done(); | |
1706 } | |
1707 }; | |
1708 | |
1709 | |
1710 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
1711 // (not performance critical as only used for roots) | |
1712 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
1713 switch (kind) { | |
1714 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
1715 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
1716 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
1717 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
1718 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
1719 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
1720 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
1721 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
1722 } | |
1723 } | |
1724 | |
1725 // Base class for all heap walk contexts. The base class maintains a flag | |
1726 // to indicate if the context is valid or not. | |
1727 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
1728 private: | |
1729 bool _valid; | |
1730 public: | |
1731 HeapWalkContext(bool valid) { _valid = valid; } | |
1732 void invalidate() { _valid = false; } | |
1733 bool is_valid() const { return _valid; } | |
1734 }; | |
1735 | |
1736 // A basic heap walk context for the deprecated heap walking functions. | |
1737 // The context for a basic heap walk are the callbacks and fields used by | |
1738 // the referrer caching scheme. | |
1739 class BasicHeapWalkContext: public HeapWalkContext { | |
1740 private: | |
1741 jvmtiHeapRootCallback _heap_root_callback; | |
1742 jvmtiStackReferenceCallback _stack_ref_callback; | |
1743 jvmtiObjectReferenceCallback _object_ref_callback; | |
1744 | |
1745 // used for caching | |
1746 oop _last_referrer; | |
1747 jlong _last_referrer_tag; | |
1748 | |
1749 public: | |
1750 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
1751 | |
1752 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
1753 jvmtiStackReferenceCallback stack_ref_callback, | |
1754 jvmtiObjectReferenceCallback object_ref_callback) : | |
1755 HeapWalkContext(true), | |
1756 _heap_root_callback(heap_root_callback), | |
1757 _stack_ref_callback(stack_ref_callback), | |
1758 _object_ref_callback(object_ref_callback), | |
1759 _last_referrer(NULL), | |
1760 _last_referrer_tag(0) { | |
1761 } | |
1762 | |
1763 // accessors | |
1764 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
1765 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
1766 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
1767 | |
1768 oop last_referrer() const { return _last_referrer; } | |
1769 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
1770 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
1771 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
1772 }; | |
1773 | |
1774 // The advanced heap walk context for the FollowReferences functions. | |
1775 // The context is the callbacks, and the fields used for filtering. | |
1776 class AdvancedHeapWalkContext: public HeapWalkContext { | |
1777 private: | |
1778 jint _heap_filter; | |
1779 KlassHandle _klass_filter; | |
1780 const jvmtiHeapCallbacks* _heap_callbacks; | |
1781 | |
1782 public: | |
1783 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
1784 | |
1785 AdvancedHeapWalkContext(jint heap_filter, | |
1786 KlassHandle klass_filter, | |
1787 const jvmtiHeapCallbacks* heap_callbacks) : | |
1788 HeapWalkContext(true), | |
1789 _heap_filter(heap_filter), | |
1790 _klass_filter(klass_filter), | |
1791 _heap_callbacks(heap_callbacks) { | |
1792 } | |
1793 | |
1794 // accessors | |
1795 jint heap_filter() const { return _heap_filter; } | |
1796 KlassHandle klass_filter() const { return _klass_filter; } | |
1797 | |
1798 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
1799 return _heap_callbacks->heap_reference_callback; | |
1800 }; | |
1801 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
1802 return _heap_callbacks->primitive_field_callback; | |
1803 } | |
1804 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
1805 return _heap_callbacks->array_primitive_value_callback; | |
1806 } | |
1807 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
1808 return _heap_callbacks->string_primitive_value_callback; | |
1809 } | |
1810 }; | |
1811 | |
1812 // The CallbackInvoker is a class with static functions that the heap walk can call | |
1813 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
1814 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
1815 // mode is for the newer FollowReferences function which supports a lot of | |
1816 // additional callbacks. | |
1817 class CallbackInvoker : AllStatic { | |
1818 private: | |
1819 // heap walk styles | |
1820 enum { basic, advanced }; | |
1821 static int _heap_walk_type; | |
1822 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
1823 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
1824 | |
1825 // context for basic style heap walk | |
1826 static BasicHeapWalkContext _basic_context; | |
1827 static BasicHeapWalkContext* basic_context() { | |
1828 assert(_basic_context.is_valid(), "invalid"); | |
1829 return &_basic_context; | |
1830 } | |
1831 | |
1832 // context for advanced style heap walk | |
1833 static AdvancedHeapWalkContext _advanced_context; | |
1834 static AdvancedHeapWalkContext* advanced_context() { | |
1835 assert(_advanced_context.is_valid(), "invalid"); | |
1836 return &_advanced_context; | |
1837 } | |
1838 | |
1839 // context needed for all heap walks | |
1840 static JvmtiTagMap* _tag_map; | |
1841 static const void* _user_data; | |
1842 static GrowableArray<oop>* _visit_stack; | |
1843 | |
1844 // accessors | |
1845 static JvmtiTagMap* tag_map() { return _tag_map; } | |
1846 static const void* user_data() { return _user_data; } | |
1847 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
1848 | |
1849 // if the object hasn't been visited then push it onto the visit stack | |
1850 // so that it will be visited later | |
1851 static inline bool check_for_visit(oop obj) { | |
1852 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
1853 return true; | |
1854 } | |
1855 | |
1856 // invoke basic style callbacks | |
1857 static inline bool invoke_basic_heap_root_callback | |
1858 (jvmtiHeapRootKind root_kind, oop obj); | |
1859 static inline bool invoke_basic_stack_ref_callback | |
1860 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
1861 int slot, oop obj); | |
1862 static inline bool invoke_basic_object_reference_callback | |
1863 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1864 | |
1865 // invoke advanced style callbacks | |
1866 static inline bool invoke_advanced_heap_root_callback | |
1867 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
1868 static inline bool invoke_advanced_stack_ref_callback | |
1869 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
1870 jmethodID method, jlocation bci, jint slot, oop obj); | |
1871 static inline bool invoke_advanced_object_reference_callback | |
1872 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1873 | |
1874 // used to report the value of primitive fields | |
1875 static inline bool report_primitive_field | |
1876 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
1877 | |
1878 public: | |
1879 // initialize for basic mode | |
1880 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1881 GrowableArray<oop>* visit_stack, | |
1882 const void* user_data, | |
1883 BasicHeapWalkContext context); | |
1884 | |
1885 // initialize for advanced mode | |
1886 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1887 GrowableArray<oop>* visit_stack, | |
1888 const void* user_data, | |
1889 AdvancedHeapWalkContext context); | |
1890 | |
1891 // functions to report roots | |
1892 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
1893 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
1894 jmethodID m, oop o); | |
1895 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
1896 jmethodID method, jlocation bci, jint slot, oop o); | |
1897 | |
1898 // functions to report references | |
1899 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
1900 static inline bool report_class_reference(oop referrer, oop referree); | |
1901 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
1902 static inline bool report_signers_reference(oop referrer, oop referree); | |
1903 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
1904 static inline bool report_superclass_reference(oop referrer, oop referree); | |
1905 static inline bool report_interface_reference(oop referrer, oop referree); | |
1906 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
1907 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
1908 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
1909 static inline bool report_primitive_array_values(oop array); | |
1910 static inline bool report_string_value(oop str); | |
1911 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
1912 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
1913 }; | |
1914 | |
1915 // statics | |
1916 int CallbackInvoker::_heap_walk_type; | |
1917 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
1918 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
1919 JvmtiTagMap* CallbackInvoker::_tag_map; | |
1920 const void* CallbackInvoker::_user_data; | |
1921 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
1922 | |
1923 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
1924 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1925 GrowableArray<oop>* visit_stack, | |
1926 const void* user_data, | |
1927 BasicHeapWalkContext context) { | |
1928 _tag_map = tag_map; | |
1929 _visit_stack = visit_stack; | |
1930 _user_data = user_data; | |
1931 _basic_context = context; | |
1932 _advanced_context.invalidate(); // will trigger assertion if used | |
1933 _heap_walk_type = basic; | |
1934 } | |
1935 | |
1936 // initialize for advanced heap walk (FollowReferences) | |
1937 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1938 GrowableArray<oop>* visit_stack, | |
1939 const void* user_data, | |
1940 AdvancedHeapWalkContext context) { | |
1941 _tag_map = tag_map; | |
1942 _visit_stack = visit_stack; | |
1943 _user_data = user_data; | |
1944 _advanced_context = context; | |
1945 _basic_context.invalidate(); // will trigger assertion if used | |
1946 _heap_walk_type = advanced; | |
1947 } | |
1948 | |
1949 | |
1950 // invoke basic style heap root callback | |
1951 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
1952 assert(ServiceUtil::visible_oop(obj), "checking"); | |
1953 | |
1954 // if we heap roots should be reported | |
1955 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
1956 if (cb == NULL) { | |
1957 return check_for_visit(obj); | |
1958 } | |
1959 | |
1960 CallbackWrapper wrapper(tag_map(), obj); | |
1961 jvmtiIterationControl control = (*cb)(root_kind, | |
1962 wrapper.klass_tag(), | |
1963 wrapper.obj_size(), | |
1964 wrapper.obj_tag_p(), | |
1965 (void*)user_data()); | |
1966 // push root to visit stack when following references | |
1967 if (control == JVMTI_ITERATION_CONTINUE && | |
1968 basic_context()->object_ref_callback() != NULL) { | |
1969 visit_stack()->push(obj); | |
1970 } | |
1971 return control != JVMTI_ITERATION_ABORT; | |
1972 } | |
1973 | |
1974 // invoke basic style stack ref callback | |
1975 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
1976 jlong thread_tag, | |
1977 jint depth, | |
1978 jmethodID method, | |
1979 jint slot, | |
1980 oop obj) { | |
1981 assert(ServiceUtil::visible_oop(obj), "checking"); | |
1982 | |
1983 // if we stack refs should be reported | |
1984 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
1985 if (cb == NULL) { | |
1986 return check_for_visit(obj); | |
1987 } | |
1988 | |
1989 CallbackWrapper wrapper(tag_map(), obj); | |
1990 jvmtiIterationControl control = (*cb)(root_kind, | |
1991 wrapper.klass_tag(), | |
1992 wrapper.obj_size(), | |
1993 wrapper.obj_tag_p(), | |
1994 thread_tag, | |
1995 depth, | |
1996 method, | |
1997 slot, | |
1998 (void*)user_data()); | |
1999 // push root to visit stack when following references | |
2000 if (control == JVMTI_ITERATION_CONTINUE && | |
2001 basic_context()->object_ref_callback() != NULL) { | |
2002 visit_stack()->push(obj); | |
2003 } | |
2004 return control != JVMTI_ITERATION_ABORT; | |
2005 } | |
2006 | |
2007 // invoke basic style object reference callback | |
2008 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
2009 oop referrer, | |
2010 oop referree, | |
2011 jint index) { | |
2012 | |
2013 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2014 assert(ServiceUtil::visible_oop(referree), "checking"); | |
2015 | |
2016 BasicHeapWalkContext* context = basic_context(); | |
2017 | |
2018 // callback requires the referrer's tag. If it's the same referrer | |
2019 // as the last call then we use the cached value. | |
2020 jlong referrer_tag; | |
2021 if (referrer == context->last_referrer()) { | |
2022 referrer_tag = context->last_referrer_tag(); | |
2023 } else { | |
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2024 referrer_tag = tag_for(tag_map(), referrer); |
0 | 2025 } |
2026 | |
2027 // do the callback | |
2028 CallbackWrapper wrapper(tag_map(), referree); | |
2029 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
2030 jvmtiIterationControl control = (*cb)(ref_kind, | |
2031 wrapper.klass_tag(), | |
2032 wrapper.obj_size(), | |
2033 wrapper.obj_tag_p(), | |
2034 referrer_tag, | |
2035 index, | |
2036 (void*)user_data()); | |
2037 | |
2038 // record referrer and referrer tag. For self-references record the | |
2039 // tag value from the callback as this might differ from referrer_tag. | |
2040 context->set_last_referrer(referrer); | |
2041 if (referrer == referree) { | |
2042 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
2043 } else { | |
2044 context->set_last_referrer_tag(referrer_tag); | |
2045 } | |
2046 | |
2047 if (control == JVMTI_ITERATION_CONTINUE) { | |
2048 return check_for_visit(referree); | |
2049 } else { | |
2050 return control != JVMTI_ITERATION_ABORT; | |
2051 } | |
2052 } | |
2053 | |
2054 // invoke advanced style heap root callback | |
2055 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
2056 oop obj) { | |
2057 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2058 | |
2059 AdvancedHeapWalkContext* context = advanced_context(); | |
2060 | |
2061 // check that callback is provided | |
2062 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2063 if (cb == NULL) { | |
2064 return check_for_visit(obj); | |
2065 } | |
2066 | |
2067 // apply class filter | |
2068 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2069 return check_for_visit(obj); | |
2070 } | |
2071 | |
2072 // setup the callback wrapper | |
2073 CallbackWrapper wrapper(tag_map(), obj); | |
2074 | |
2075 // apply tag filter | |
2076 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2077 wrapper.klass_tag(), | |
2078 context->heap_filter())) { | |
2079 return check_for_visit(obj); | |
2080 } | |
2081 | |
2082 // for arrays we need the length, otherwise -1 | |
2083 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2084 | |
2085 // invoke the callback | |
2086 jint res = (*cb)(ref_kind, | |
2087 NULL, // referrer info | |
2088 wrapper.klass_tag(), | |
2089 0, // referrer_class_tag is 0 for heap root | |
2090 wrapper.obj_size(), | |
2091 wrapper.obj_tag_p(), | |
2092 NULL, // referrer_tag_p | |
2093 len, | |
2094 (void*)user_data()); | |
2095 if (res & JVMTI_VISIT_ABORT) { | |
2096 return false;// referrer class tag | |
2097 } | |
2098 if (res & JVMTI_VISIT_OBJECTS) { | |
2099 check_for_visit(obj); | |
2100 } | |
2101 return true; | |
2102 } | |
2103 | |
2104 // report a reference from a thread stack to an object | |
2105 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
2106 jlong thread_tag, | |
2107 jlong tid, | |
2108 int depth, | |
2109 jmethodID method, | |
2110 jlocation bci, | |
2111 jint slot, | |
2112 oop obj) { | |
2113 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2114 | |
2115 AdvancedHeapWalkContext* context = advanced_context(); | |
2116 | |
2117 // check that callback is provider | |
2118 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2119 if (cb == NULL) { | |
2120 return check_for_visit(obj); | |
2121 } | |
2122 | |
2123 // apply class filter | |
2124 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2125 return check_for_visit(obj); | |
2126 } | |
2127 | |
2128 // setup the callback wrapper | |
2129 CallbackWrapper wrapper(tag_map(), obj); | |
2130 | |
2131 // apply tag filter | |
2132 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2133 wrapper.klass_tag(), | |
2134 context->heap_filter())) { | |
2135 return check_for_visit(obj); | |
2136 } | |
2137 | |
2138 // setup the referrer info | |
2139 jvmtiHeapReferenceInfo reference_info; | |
2140 reference_info.stack_local.thread_tag = thread_tag; | |
2141 reference_info.stack_local.thread_id = tid; | |
2142 reference_info.stack_local.depth = depth; | |
2143 reference_info.stack_local.method = method; | |
2144 reference_info.stack_local.location = bci; | |
2145 reference_info.stack_local.slot = slot; | |
2146 | |
2147 // for arrays we need the length, otherwise -1 | |
2148 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2149 | |
2150 // call into the agent | |
2151 int res = (*cb)(ref_kind, | |
2152 &reference_info, | |
2153 wrapper.klass_tag(), | |
2154 0, // referrer_class_tag is 0 for heap root (stack) | |
2155 wrapper.obj_size(), | |
2156 wrapper.obj_tag_p(), | |
2157 NULL, // referrer_tag is 0 for root | |
2158 len, | |
2159 (void*)user_data()); | |
2160 | |
2161 if (res & JVMTI_VISIT_ABORT) { | |
2162 return false; | |
2163 } | |
2164 if (res & JVMTI_VISIT_OBJECTS) { | |
2165 check_for_visit(obj); | |
2166 } | |
2167 return true; | |
2168 } | |
2169 | |
2170 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
2171 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
2172 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
2173 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
2174 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
2175 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
2176 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
2177 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
2178 | |
2179 // invoke the object reference callback to report a reference | |
2180 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
2181 oop referrer, | |
2182 oop obj, | |
2183 jint index) | |
2184 { | |
2185 // field index is only valid field in reference_info | |
2186 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2187 | |
2188 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2189 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2190 | |
2191 AdvancedHeapWalkContext* context = advanced_context(); | |
2192 | |
2193 // check that callback is provider | |
2194 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2195 if (cb == NULL) { | |
2196 return check_for_visit(obj); | |
2197 } | |
2198 | |
2199 // apply class filter | |
2200 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2201 return check_for_visit(obj); | |
2202 } | |
2203 | |
2204 // setup the callback wrapper | |
2205 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
2206 | |
2207 // apply tag filter | |
2208 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2209 wrapper.klass_tag(), | |
2210 context->heap_filter())) { | |
2211 return check_for_visit(obj); | |
2212 } | |
2213 | |
2214 // field index is only valid field in reference_info | |
2215 reference_info.field.index = index; | |
2216 | |
2217 // for arrays we need the length, otherwise -1 | |
2218 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2219 | |
2220 // invoke the callback | |
2221 int res = (*cb)(ref_kind, | |
2222 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
2223 wrapper.klass_tag(), | |
2224 wrapper.referrer_klass_tag(), | |
2225 wrapper.obj_size(), | |
2226 wrapper.obj_tag_p(), | |
2227 wrapper.referrer_tag_p(), | |
2228 len, | |
2229 (void*)user_data()); | |
2230 | |
2231 if (res & JVMTI_VISIT_ABORT) { | |
2232 return false; | |
2233 } | |
2234 if (res & JVMTI_VISIT_OBJECTS) { | |
2235 check_for_visit(obj); | |
2236 } | |
2237 return true; | |
2238 } | |
2239 | |
2240 // report a "simple root" | |
2241 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
2242 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
2243 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
2244 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2245 | |
2246 if (is_basic_heap_walk()) { | |
2247 // map to old style root kind | |
2248 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
2249 return invoke_basic_heap_root_callback(root_kind, obj); | |
2250 } else { | |
2251 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
2252 return invoke_advanced_heap_root_callback(kind, obj); | |
2253 } | |
2254 } | |
2255 | |
2256 | |
2257 // invoke the primitive array values | |
2258 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
2259 assert(obj->is_typeArray(), "not a primitive array"); | |
2260 | |
2261 AdvancedHeapWalkContext* context = advanced_context(); | |
2262 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
2263 | |
2264 // apply class filter | |
2265 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2266 return true; | |
2267 } | |
2268 | |
2269 CallbackWrapper wrapper(tag_map(), obj); | |
2270 | |
2271 // apply tag filter | |
2272 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2273 wrapper.klass_tag(), | |
2274 context->heap_filter())) { | |
2275 return true; | |
2276 } | |
2277 | |
2278 // invoke the callback | |
2279 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
2280 &wrapper, | |
2281 obj, | |
2282 (void*)user_data()); | |
2283 return (!(res & JVMTI_VISIT_ABORT)); | |
2284 } | |
2285 | |
2286 // invoke the string value callback | |
2287 inline bool CallbackInvoker::report_string_value(oop str) { | |
1142 | 2288 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 2289 |
2290 AdvancedHeapWalkContext* context = advanced_context(); | |
2291 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
2292 | |
2293 // apply class filter | |
2294 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
2295 return true; | |
2296 } | |
2297 | |
2298 CallbackWrapper wrapper(tag_map(), str); | |
2299 | |
2300 // apply tag filter | |
2301 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2302 wrapper.klass_tag(), | |
2303 context->heap_filter())) { | |
2304 return true; | |
2305 } | |
2306 | |
2307 // invoke the callback | |
2308 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
2309 &wrapper, | |
2310 str, | |
2311 (void*)user_data()); | |
2312 return (!(res & JVMTI_VISIT_ABORT)); | |
2313 } | |
2314 | |
2315 // invoke the primitive field callback | |
2316 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
2317 oop obj, | |
2318 jint index, | |
2319 address addr, | |
2320 char type) | |
2321 { | |
2322 // for primitive fields only the index will be set | |
2323 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2324 | |
2325 AdvancedHeapWalkContext* context = advanced_context(); | |
2326 assert(context->primitive_field_callback() != NULL, "no callback"); | |
2327 | |
2328 // apply class filter | |
2329 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2330 return true; | |
2331 } | |
2332 | |
2333 CallbackWrapper wrapper(tag_map(), obj); | |
2334 | |
2335 // apply tag filter | |
2336 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2337 wrapper.klass_tag(), | |
2338 context->heap_filter())) { | |
2339 return true; | |
2340 } | |
2341 | |
2342 // the field index in the referrer | |
2343 reference_info.field.index = index; | |
2344 | |
2345 // map the type | |
2346 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
2347 | |
2348 // setup the jvalue | |
2349 jvalue value; | |
2350 copy_to_jvalue(&value, addr, value_type); | |
2351 | |
2352 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
2353 int res = (*cb)(ref_kind, | |
2354 &reference_info, | |
2355 wrapper.klass_tag(), | |
2356 wrapper.obj_tag_p(), | |
2357 value, | |
2358 value_type, | |
2359 (void*)user_data()); | |
2360 return (!(res & JVMTI_VISIT_ABORT)); | |
2361 } | |
2362 | |
2363 | |
2364 // instance field | |
2365 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
2366 jint index, | |
2367 address value, | |
2368 char type) { | |
2369 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
2370 obj, | |
2371 index, | |
2372 value, | |
2373 type); | |
2374 } | |
2375 | |
2376 // static field | |
2377 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
2378 jint index, | |
2379 address value, | |
2380 char type) { | |
2381 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
2382 obj, | |
2383 index, | |
2384 value, | |
2385 type); | |
2386 } | |
2387 | |
2388 // report a JNI local (root object) to the profiler | |
2389 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
2390 if (is_basic_heap_walk()) { | |
2391 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
2392 thread_tag, | |
2393 depth, | |
2394 m, | |
2395 -1, | |
2396 obj); | |
2397 } else { | |
2398 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
2399 thread_tag, tid, | |
2400 depth, | |
2401 m, | |
2402 (jlocation)-1, | |
2403 -1, | |
2404 obj); | |
2405 } | |
2406 } | |
2407 | |
2408 | |
2409 // report a local (stack reference, root object) | |
2410 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
2411 jlong tid, | |
2412 jint depth, | |
2413 jmethodID method, | |
2414 jlocation bci, | |
2415 jint slot, | |
2416 oop obj) { | |
2417 if (is_basic_heap_walk()) { | |
2418 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
2419 thread_tag, | |
2420 depth, | |
2421 method, | |
2422 slot, | |
2423 obj); | |
2424 } else { | |
2425 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
2426 thread_tag, | |
2427 tid, | |
2428 depth, | |
2429 method, | |
2430 bci, | |
2431 slot, | |
2432 obj); | |
2433 } | |
2434 } | |
2435 | |
2436 // report an object referencing a class. | |
2437 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
2438 if (is_basic_heap_walk()) { | |
2439 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2440 } else { | |
2441 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
2442 } | |
2443 } | |
2444 | |
2445 // report a class referencing its class loader. | |
2446 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
2447 if (is_basic_heap_walk()) { | |
2448 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2449 } else { | |
2450 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2451 } | |
2452 } | |
2453 | |
2454 // report a class referencing its signers. | |
2455 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
2456 if (is_basic_heap_walk()) { | |
2457 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
2458 } else { | |
2459 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
2460 } | |
2461 } | |
2462 | |
2463 // report a class referencing its protection domain.. | |
2464 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
2465 if (is_basic_heap_walk()) { | |
2466 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2467 } else { | |
2468 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2469 } | |
2470 } | |
2471 | |
2472 // report a class referencing its superclass. | |
2473 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
2474 if (is_basic_heap_walk()) { | |
2475 // Send this to be consistent with past implementation | |
2476 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2477 } else { | |
2478 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); | |
2479 } | |
2480 } | |
2481 | |
2482 // report a class referencing one of its interfaces. | |
2483 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
2484 if (is_basic_heap_walk()) { | |
2485 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
2486 } else { | |
2487 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
2488 } | |
2489 } | |
2490 | |
2491 // report a class referencing one of its static fields. | |
2492 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
2493 if (is_basic_heap_walk()) { | |
2494 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2495 } else { | |
2496 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2497 } | |
2498 } | |
2499 | |
2500 // report an array referencing an element object | |
2501 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
2502 if (is_basic_heap_walk()) { | |
2503 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2504 } else { | |
2505 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2506 } | |
2507 } | |
2508 | |
2509 // report an object referencing an instance field object | |
2510 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
2511 if (is_basic_heap_walk()) { | |
2512 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
2513 } else { | |
2514 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
2515 } | |
2516 } | |
2517 | |
2518 // report an array referencing an element object | |
2519 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
2520 if (is_basic_heap_walk()) { | |
2521 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2522 } else { | |
2523 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2524 } | |
2525 } | |
2526 | |
2527 // A supporting closure used to process simple roots | |
2528 class SimpleRootsClosure : public OopClosure { | |
2529 private: | |
2530 jvmtiHeapReferenceKind _kind; | |
2531 bool _continue; | |
2532 | |
2533 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
2534 | |
2535 public: | |
2536 void set_kind(jvmtiHeapReferenceKind kind) { | |
2537 _kind = kind; | |
2538 _continue = true; | |
2539 } | |
2540 | |
2541 inline bool stopped() { | |
2542 return !_continue; | |
2543 } | |
2544 | |
2545 void do_oop(oop* obj_p) { | |
2546 // iteration has terminated | |
2547 if (stopped()) { | |
2548 return; | |
2549 } | |
2550 | |
2551 // ignore null or deleted handles | |
2552 oop o = *obj_p; | |
2553 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2554 return; | |
2555 } | |
2556 | |
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2557 assert(Universe::heap()->is_in_reserved(o), "should be impossible"); |
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2558 |
0 | 2559 jvmtiHeapReferenceKind kind = root_kind(); |
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2560 if (kind == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { |
0 | 2561 // SystemDictionary::always_strong_oops_do reports the application |
2562 // class loader as a root. We want this root to be reported as | |
2563 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
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2564 if (!o->is_instanceMirror()) { |
0 | 2565 kind = JVMTI_HEAP_REFERENCE_OTHER; |
2566 } | |
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2567 } |
0 | 2568 |
2569 // some objects are ignored - in the case of simple | |
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2570 // roots it's mostly Symbol*s that we are skipping |
0 | 2571 // here. |
2572 if (!ServiceUtil::visible_oop(o)) { | |
2573 return; | |
2574 } | |
2575 | |
2576 // invoke the callback | |
2577 _continue = CallbackInvoker::report_simple_root(kind, o); | |
2578 | |
2579 } | |
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2580 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2581 }; |
2582 | |
2583 // A supporting closure used to process JNI locals | |
2584 class JNILocalRootsClosure : public OopClosure { | |
2585 private: | |
2586 jlong _thread_tag; | |
2587 jlong _tid; | |
2588 jint _depth; | |
2589 jmethodID _method; | |
2590 bool _continue; | |
2591 public: | |
2592 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
2593 _thread_tag = thread_tag; | |
2594 _tid = tid; | |
2595 _depth = depth; | |
2596 _method = method; | |
2597 _continue = true; | |
2598 } | |
2599 | |
2600 inline bool stopped() { | |
2601 return !_continue; | |
2602 } | |
2603 | |
2604 void do_oop(oop* obj_p) { | |
2605 // iteration has terminated | |
2606 if (stopped()) { | |
2607 return; | |
2608 } | |
2609 | |
2610 // ignore null or deleted handles | |
2611 oop o = *obj_p; | |
2612 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2613 return; | |
2614 } | |
2615 | |
2616 if (!ServiceUtil::visible_oop(o)) { | |
2617 return; | |
2618 } | |
2619 | |
2620 // invoke the callback | |
2621 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
2622 } | |
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2623 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2624 }; |
2625 | |
2626 | |
2627 // A VM operation to iterate over objects that are reachable from | |
2628 // a set of roots or an initial object. | |
2629 // | |
2630 // For VM_HeapWalkOperation the set of roots used is :- | |
2631 // | |
2632 // - All JNI global references | |
2633 // - All inflated monitors | |
2634 // - All classes loaded by the boot class loader (or all classes | |
2635 // in the event that class unloading is disabled) | |
2636 // - All java threads | |
2637 // - For each java thread then all locals and JNI local references | |
2638 // on the thread's execution stack | |
2639 // - All visible/explainable objects from Universes::oops_do | |
2640 // | |
2641 class VM_HeapWalkOperation: public VM_Operation { | |
2642 private: | |
2643 enum { | |
2644 initial_visit_stack_size = 4000 | |
2645 }; | |
2646 | |
2647 bool _is_advanced_heap_walk; // indicates FollowReferences | |
2648 JvmtiTagMap* _tag_map; | |
2649 Handle _initial_object; | |
2650 GrowableArray<oop>* _visit_stack; // the visit stack | |
2651 | |
2652 bool _collecting_heap_roots; // are we collecting roots | |
2653 bool _following_object_refs; // are we following object references | |
2654 | |
2655 bool _reporting_primitive_fields; // optional reporting | |
2656 bool _reporting_primitive_array_values; | |
2657 bool _reporting_string_values; | |
2658 | |
2659 GrowableArray<oop>* create_visit_stack() { | |
6197 | 2660 return new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(initial_visit_stack_size, true); |
0 | 2661 } |
2662 | |
2663 // accessors | |
2664 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
2665 JvmtiTagMap* tag_map() const { return _tag_map; } | |
2666 Handle initial_object() const { return _initial_object; } | |
2667 | |
2668 bool is_following_references() const { return _following_object_refs; } | |
2669 | |
2670 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
2671 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
2672 bool is_reporting_string_values() const { return _reporting_string_values; } | |
2673 | |
2674 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
2675 | |
2676 // iterate over the various object types | |
2677 inline bool iterate_over_array(oop o); | |
2678 inline bool iterate_over_type_array(oop o); | |
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2679 inline bool iterate_over_class(oop o); |
0 | 2680 inline bool iterate_over_object(oop o); |
2681 | |
2682 // root collection | |
2683 inline bool collect_simple_roots(); | |
2684 inline bool collect_stack_roots(); | |
2685 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
2686 | |
2687 // visit an object | |
2688 inline bool visit(oop o); | |
2689 | |
2690 public: | |
2691 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2692 Handle initial_object, | |
2693 BasicHeapWalkContext callbacks, | |
2694 const void* user_data); | |
2695 | |
2696 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2697 Handle initial_object, | |
2698 AdvancedHeapWalkContext callbacks, | |
2699 const void* user_data); | |
2700 | |
2701 ~VM_HeapWalkOperation(); | |
2702 | |
2703 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
2704 void doit(); | |
2705 }; | |
2706 | |
2707 | |
2708 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2709 Handle initial_object, | |
2710 BasicHeapWalkContext callbacks, | |
2711 const void* user_data) { | |
2712 _is_advanced_heap_walk = false; | |
2713 _tag_map = tag_map; | |
2714 _initial_object = initial_object; | |
2715 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
2716 _reporting_primitive_fields = false; | |
2717 _reporting_primitive_array_values = false; | |
2718 _reporting_string_values = false; | |
2719 _visit_stack = create_visit_stack(); | |
2720 | |
2721 | |
2722 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2723 } | |
2724 | |
2725 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2726 Handle initial_object, | |
2727 AdvancedHeapWalkContext callbacks, | |
2728 const void* user_data) { | |
2729 _is_advanced_heap_walk = true; | |
2730 _tag_map = tag_map; | |
2731 _initial_object = initial_object; | |
2732 _following_object_refs = true; | |
2733 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
2734 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
2735 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
2736 _visit_stack = create_visit_stack(); | |
2737 | |
2738 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2739 } | |
2740 | |
2741 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
2742 if (_following_object_refs) { | |
2743 assert(_visit_stack != NULL, "checking"); | |
2744 delete _visit_stack; | |
2745 _visit_stack = NULL; | |
2746 } | |
2747 } | |
2748 | |
2749 // an array references its class and has a reference to | |
2750 // each element in the array | |
2751 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
2752 objArrayOop array = objArrayOop(o); | |
2753 | |
2754 // array reference to its class | |
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2755 oop mirror = ObjArrayKlass::cast(array->klass())->java_mirror(); |
0 | 2756 if (!CallbackInvoker::report_class_reference(o, mirror)) { |
2757 return false; | |
2758 } | |
2759 | |
2760 // iterate over the array and report each reference to a | |
2761 // non-null element | |
2762 for (int index=0; index<array->length(); index++) { | |
2763 oop elem = array->obj_at(index); | |
2764 if (elem == NULL) { | |
2765 continue; | |
2766 } | |
2767 | |
2768 // report the array reference o[index] = elem | |
2769 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
2770 return false; | |
2771 } | |
2772 } | |
2773 return true; | |
2774 } | |
2775 | |
2776 // a type array references its class | |
2777 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
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2778 Klass* k = o->klass(); |
6983 | 2779 oop mirror = k->java_mirror(); |
0 | 2780 if (!CallbackInvoker::report_class_reference(o, mirror)) { |
2781 return false; | |
2782 } | |
2783 | |
2784 // report the array contents if required | |
2785 if (is_reporting_primitive_array_values()) { | |
2786 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
2787 return false; | |
2788 } | |
2789 } | |
2790 return true; | |
2791 } | |
2792 | |
2793 // verify that a static oop field is in range | |
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2794 static inline bool verify_static_oop(InstanceKlass* ik, |
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2795 oop mirror, int offset) { |
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2796 address obj_p = (address)mirror + offset; |
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2797 address start = (address)InstanceMirrorKlass::start_of_static_fields(mirror); |
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2798 address end = start + (java_lang_Class::static_oop_field_count(mirror) * heapOopSize); |
0 | 2799 assert(end >= start, "sanity check"); |
2800 | |
2801 if (obj_p >= start && obj_p < end) { | |
2802 return true; | |
2803 } else { | |
2804 return false; | |
2805 } | |
2806 } | |
2807 | |
2808 // a class references its super class, interfaces, class loader, ... | |
2809 // and finally its static fields | |
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2810 inline bool VM_HeapWalkOperation::iterate_over_class(oop java_class) { |
0 | 2811 int i; |
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2812 Klass* klass = java_lang_Class::as_Klass(java_class); |
0 | 2813 |
2814 if (klass->oop_is_instance()) { | |
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2815 InstanceKlass* ik = InstanceKlass::cast(klass); |
0 | 2816 |
2817 // ignore the class if it's has been initialized yet | |
2818 if (!ik->is_linked()) { | |
2819 return true; | |
2820 } | |
2821 | |
2822 // get the java mirror | |
2823 oop mirror = klass->java_mirror(); | |
2824 | |
2825 // super (only if something more interesting than java.lang.Object) | |
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2826 Klass* java_super = ik->java_super(); |
1142 | 2827 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
6983 | 2828 oop super = java_super->java_mirror(); |
0 | 2829 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { |
2830 return false; | |
2831 } | |
2832 } | |
2833 | |
2834 // class loader | |
2835 oop cl = ik->class_loader(); | |
2836 if (cl != NULL) { | |
2837 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
2838 return false; | |
2839 } | |
2840 } | |
2841 | |
2842 // protection domain | |
2843 oop pd = ik->protection_domain(); | |
2844 if (pd != NULL) { | |
2845 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
2846 return false; | |
2847 } | |
2848 } | |
2849 | |
2850 // signers | |
2851 oop signers = ik->signers(); | |
2852 if (signers != NULL) { | |
2853 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
2854 return false; | |
2855 } | |
2856 } | |
2857 | |
2858 // references from the constant pool | |
2859 { | |
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2860 ConstantPool* pool = ik->constants(); |
0 | 2861 for (int i = 1; i < pool->length(); i++) { |
2862 constantTag tag = pool->tag_at(i).value(); | |
2863 if (tag.is_string() || tag.is_klass()) { | |
2864 oop entry; | |
2865 if (tag.is_string()) { | |
2866 entry = pool->resolved_string_at(i); | |
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2867 // If the entry is non-null it is resolved. |
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2868 if (entry == NULL) continue; |
0 | 2869 } else { |
6983 | 2870 entry = pool->resolved_klass_at(i)->java_mirror(); |
0 | 2871 } |
2872 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
2873 return false; | |
2874 } | |
2875 } | |
2876 } | |
2877 } | |
2878 | |
2879 // interfaces | |
2880 // (These will already have been reported as references from the constant pool | |
2881 // but are specified by IterateOverReachableObjects and must be reported). | |
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2882 Array<Klass*>* interfaces = ik->local_interfaces(); |
0 | 2883 for (i = 0; i < interfaces->length(); i++) { |
6983 | 2884 oop interf = ((Klass*)interfaces->at(i))->java_mirror(); |
0 | 2885 if (interf == NULL) { |
2886 continue; | |
2887 } | |
2888 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
2889 return false; | |
2890 } | |
2891 } | |
2892 | |
2893 // iterate over the static fields | |
2894 | |
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2895 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
0 | 2896 for (i=0; i<field_map->field_count(); i++) { |
2897 ClassFieldDescriptor* field = field_map->field_at(i); | |
2898 char type = field->field_type(); | |
2899 if (!is_primitive_field_type(type)) { | |
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2900 oop fld_o = mirror->obj_field(field->field_offset()); |
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2901 assert(verify_static_oop(ik, mirror, field->field_offset()), "sanity check"); |
0 | 2902 if (fld_o != NULL) { |
2903 int slot = field->field_index(); | |
2904 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
2905 delete field_map; | |
2906 return false; | |
2907 } | |
2908 } | |
2909 } else { | |
2910 if (is_reporting_primitive_fields()) { | |
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2911 address addr = (address)mirror + field->field_offset(); |
0 | 2912 int slot = field->field_index(); |
2913 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
2914 delete field_map; | |
2915 return false; | |
2916 } | |
2917 } | |
2918 } | |
2919 } | |
2920 delete field_map; | |
2921 | |
2922 return true; | |
2923 } | |
2924 | |
2925 return true; | |
2926 } | |
2927 | |
2928 // an object references a class and its instance fields | |
2929 // (static fields are ignored here as we report these as | |
2930 // references from the class). | |
2931 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
2932 // reference to the class | |
6983 | 2933 if (!CallbackInvoker::report_class_reference(o, o->klass()->java_mirror())) { |
0 | 2934 return false; |
2935 } | |
2936 | |
2937 // iterate over instance fields | |
2938 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
2939 for (int i=0; i<field_map->field_count(); i++) { | |
2940 ClassFieldDescriptor* field = field_map->field_at(i); | |
2941 char type = field->field_type(); | |
2942 if (!is_primitive_field_type(type)) { | |
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2943 oop fld_o = o->obj_field(field->field_offset()); |
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2944 // ignore any objects that aren't visible to profiler |
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2945 if (fld_o != NULL && ServiceUtil::visible_oop(fld_o)) { |
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2946 assert(Universe::heap()->is_in_reserved(fld_o), "unsafe code should not " |
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2947 "have references to Klass* anymore"); |
0 | 2948 int slot = field->field_index(); |
2949 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
2950 return false; | |
2951 } | |
2952 } | |
2953 } else { | |
2954 if (is_reporting_primitive_fields()) { | |
2955 // primitive instance field | |
2956 address addr = (address)o + field->field_offset(); | |
2957 int slot = field->field_index(); | |
2958 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
2959 return false; | |
2960 } | |
2961 } | |
2962 } | |
2963 } | |
2964 | |
2965 // if the object is a java.lang.String | |
2966 if (is_reporting_string_values() && | |
1142 | 2967 o->klass() == SystemDictionary::String_klass()) { |
0 | 2968 if (!CallbackInvoker::report_string_value(o)) { |
2969 return false; | |
2970 } | |
2971 } | |
2972 return true; | |
2973 } | |
2974 | |
2975 | |
3816
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2976 // Collects all simple (non-stack) roots except for threads; |
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|
2977 // threads are handled in collect_stack_roots() as an optimization. |
0 | 2978 // if there's a heap root callback provided then the callback is |
2979 // invoked for each simple root. | |
2980 // if an object reference callback is provided then all simple | |
2981 // roots are pushed onto the marking stack so that they can be | |
2982 // processed later | |
2983 // | |
2984 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
2985 SimpleRootsClosure blk; | |
2986 | |
2987 // JNI globals | |
2988 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
2989 JNIHandles::oops_do(&blk); | |
2990 if (blk.stopped()) { | |
2991 return false; | |
2992 } | |
2993 | |
2994 // Preloaded classes and loader from the system dictionary | |
2995 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
2996 SystemDictionary::always_strong_oops_do(&blk); | |
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2997 KlassToOopClosure klass_blk(&blk); |
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2998 ClassLoaderDataGraph::always_strong_oops_do(&blk, &klass_blk, false); |
0 | 2999 if (blk.stopped()) { |
3000 return false; | |
3001 } | |
3002 | |
3003 // Inflated monitors | |
3004 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
3005 ObjectSynchronizer::oops_do(&blk); | |
3006 if (blk.stopped()) { | |
3007 return false; | |
3008 } | |
3009 | |
3816
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3010 // threads are now handled in collect_stack_roots() |
0 | 3011 |
3012 // Other kinds of roots maintained by HotSpot | |
3013 // Many of these won't be visible but others (such as instances of important | |
3014 // exceptions) will be visible. | |
3015 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
3016 Universe::oops_do(&blk); | |
989
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6863023: need non-perm oops in code cache for JSR 292
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|
3017 |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
3018 // If there are any non-perm roots in the code cache, visit them. |
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6863023: need non-perm oops in code cache for JSR 292
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|
3019 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
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6863023: need non-perm oops in code cache for JSR 292
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3020 CodeBlobToOopClosure look_in_blobs(&blk, false); |
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3021 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
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3022 |
0 | 3023 return true; |
3024 } | |
3025 | |
3026 // Walk the stack of a given thread and find all references (locals | |
3027 // and JNI calls) and report these as stack references | |
3028 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
3029 JNILocalRootsClosure* blk) | |
3030 { | |
3031 oop threadObj = java_thread->threadObj(); | |
3032 assert(threadObj != NULL, "sanity check"); | |
3033 | |
3034 // only need to get the thread's tag once per thread | |
3035 jlong thread_tag = tag_for(_tag_map, threadObj); | |
3036 | |
3037 // also need the thread id | |
3038 jlong tid = java_lang_Thread::thread_id(threadObj); | |
3039 | |
3040 | |
3041 if (java_thread->has_last_Java_frame()) { | |
3042 | |
3043 // vframes are resource allocated | |
3044 Thread* current_thread = Thread::current(); | |
3045 ResourceMark rm(current_thread); | |
3046 HandleMark hm(current_thread); | |
3047 | |
3048 RegisterMap reg_map(java_thread); | |
3049 frame f = java_thread->last_frame(); | |
3050 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
3051 | |
3052 bool is_top_frame = true; | |
3053 int depth = 0; | |
3054 frame* last_entry_frame = NULL; | |
3055 | |
3056 while (vf != NULL) { | |
3057 if (vf->is_java_frame()) { | |
3058 | |
3059 // java frame (interpreted, compiled, ...) | |
3060 javaVFrame *jvf = javaVFrame::cast(vf); | |
3061 | |
3062 // the jmethodID | |
3063 jmethodID method = jvf->method()->jmethod_id(); | |
3064 | |
3065 if (!(jvf->method()->is_native())) { | |
3066 jlocation bci = (jlocation)jvf->bci(); | |
3067 StackValueCollection* locals = jvf->locals(); | |
3068 for (int slot=0; slot<locals->size(); slot++) { | |
3069 if (locals->at(slot)->type() == T_OBJECT) { | |
3070 oop o = locals->obj_at(slot)(); | |
3071 if (o == NULL) { | |
3072 continue; | |
3073 } | |
3074 | |
3075 // stack reference | |
3076 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
3077 bci, slot, o)) { | |
3078 return false; | |
3079 } | |
3080 } | |
3081 } | |
3082 } else { | |
3083 blk->set_context(thread_tag, tid, depth, method); | |
3084 if (is_top_frame) { | |
3085 // JNI locals for the top frame. | |
3086 java_thread->active_handles()->oops_do(blk); | |
3087 } else { | |
3088 if (last_entry_frame != NULL) { | |
3089 // JNI locals for the entry frame | |
3090 assert(last_entry_frame->is_entry_frame(), "checking"); | |
3091 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
3092 } | |
3093 } | |
3094 } | |
3095 last_entry_frame = NULL; | |
3096 depth++; | |
3097 } else { | |
3098 // externalVFrame - for an entry frame then we report the JNI locals | |
3099 // when we find the corresponding javaVFrame | |
3100 frame* fr = vf->frame_pointer(); | |
3101 assert(fr != NULL, "sanity check"); | |
3102 if (fr->is_entry_frame()) { | |
3103 last_entry_frame = fr; | |
3104 } | |
3105 } | |
3106 | |
3107 vf = vf->sender(); | |
3108 is_top_frame = false; | |
3109 } | |
3110 } else { | |
3111 // no last java frame but there may be JNI locals | |
3112 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
3113 java_thread->active_handles()->oops_do(blk); | |
3114 } | |
3115 return true; | |
3116 } | |
3117 | |
3118 | |
3816
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3119 // Collects the simple roots for all threads and collects all |
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3120 // stack roots - for each thread it walks the execution |
0 | 3121 // stack to find all references and local JNI refs. |
3122 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
3123 JNILocalRootsClosure blk; | |
3124 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
3125 oop threadObj = thread->threadObj(); | |
3126 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
3816
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changeset
|
3127 // Collect the simple root for this thread before we |
88dce6a60ac8
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|
3128 // collect its stack roots |
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changeset
|
3129 if (!CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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changeset
|
3130 threadObj)) { |
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changeset
|
3131 return false; |
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|
3132 } |
0 | 3133 if (!collect_stack_roots(thread, &blk)) { |
3134 return false; | |
3135 } | |
3136 } | |
3137 } | |
3138 return true; | |
3139 } | |
3140 | |
3141 // visit an object | |
3142 // first mark the object as visited | |
3143 // second get all the outbound references from this object (in other words, all | |
3144 // the objects referenced by this object). | |
3145 // | |
3146 bool VM_HeapWalkOperation::visit(oop o) { | |
3147 // mark object as visited | |
3148 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
3149 ObjectMarker::mark(o); | |
3150 | |
3151 // instance | |
3152 if (o->is_instance()) { | |
1142 | 3153 if (o->klass() == SystemDictionary::Class_klass()) { |
6725
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6964458: Reimplement class meta-data storage to use native memory
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3154 if (!java_lang_Class::is_primitive(o)) { |
0 | 3155 // a java.lang.Class |
6725
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6964458: Reimplement class meta-data storage to use native memory
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3156 return iterate_over_class(o); |
0 | 3157 } |
3158 } else { | |
3159 return iterate_over_object(o); | |
3160 } | |
3161 } | |
3162 | |
3163 // object array | |
3164 if (o->is_objArray()) { | |
3165 return iterate_over_array(o); | |
3166 } | |
3167 | |
3168 // type array | |
3169 if (o->is_typeArray()) { | |
3170 return iterate_over_type_array(o); | |
3171 } | |
3172 | |
3173 return true; | |
3174 } | |
3175 | |
3176 void VM_HeapWalkOperation::doit() { | |
3177 ResourceMark rm; | |
3178 ObjectMarkerController marker; | |
3179 ClassFieldMapCacheMark cm; | |
3180 | |
3181 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
3182 | |
3183 // the heap walk starts with an initial object or the heap roots | |
3184 if (initial_object().is_null()) { | |
3815 | 3185 // If either collect_stack_roots() or collect_simple_roots() |
3186 // returns false at this point, then there are no mark bits | |
3187 // to reset. | |
3188 ObjectMarker::set_needs_reset(false); | |
3189 | |
3816
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|
3190 // Calling collect_stack_roots() before collect_simple_roots() |
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|
3191 // can result in a big performance boost for an agent that is |
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|
3192 // focused on analyzing references in the thread stacks. |
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|
3193 if (!collect_stack_roots()) return; |
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|
3194 |
0 | 3195 if (!collect_simple_roots()) return; |
3815 | 3196 |
3197 // no early return so enable heap traversal to reset the mark bits | |
3198 ObjectMarker::set_needs_reset(true); | |
0 | 3199 } else { |
3200 visit_stack()->push(initial_object()()); | |
3201 } | |
3202 | |
3203 // object references required | |
3204 if (is_following_references()) { | |
3205 | |
3206 // visit each object until all reachable objects have been | |
3207 // visited or the callback asked to terminate the iteration. | |
3208 while (!visit_stack()->is_empty()) { | |
3209 oop o = visit_stack()->pop(); | |
3210 if (!ObjectMarker::visited(o)) { | |
3211 if (!visit(o)) { | |
3212 break; | |
3213 } | |
3214 } | |
3215 } | |
3216 } | |
3217 } | |
3218 | |
3219 // iterate over all objects that are reachable from a set of roots | |
3220 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
3221 jvmtiStackReferenceCallback stack_ref_callback, | |
3222 jvmtiObjectReferenceCallback object_ref_callback, | |
3223 const void* user_data) { | |
3224 MutexLocker ml(Heap_lock); | |
3225 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
3226 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
3227 VMThread::execute(&op); | |
3228 } | |
3229 | |
3230 // iterate over all objects that are reachable from a given object | |
3231 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
3232 jvmtiObjectReferenceCallback object_ref_callback, | |
3233 const void* user_data) { | |
3234 oop obj = JNIHandles::resolve(object); | |
3235 Handle initial_object(Thread::current(), obj); | |
3236 | |
3237 MutexLocker ml(Heap_lock); | |
3238 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
3239 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3240 VMThread::execute(&op); | |
3241 } | |
3242 | |
3243 // follow references from an initial object or the GC roots | |
3244 void JvmtiTagMap::follow_references(jint heap_filter, | |
3245 KlassHandle klass, | |
3246 jobject object, | |
3247 const jvmtiHeapCallbacks* callbacks, | |
3248 const void* user_data) | |
3249 { | |
3250 oop obj = JNIHandles::resolve(object); | |
3251 Handle initial_object(Thread::current(), obj); | |
3252 | |
3253 MutexLocker ml(Heap_lock); | |
3254 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
3255 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3256 VMThread::execute(&op); | |
3257 } | |
3258 | |
3259 | |
2125
7246a374a9f2
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changeset
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3260 void JvmtiTagMap::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) { |
2145
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7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
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diff
changeset
|
3261 // 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)
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diff
changeset
|
3262 // thread creation and before VMThread creation (1 thread); initial GC |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
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diff
changeset
|
3263 // verification can happen in that window which gets to here. |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
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2125
diff
changeset
|
3264 assert(Threads::number_of_threads() <= 1 || |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
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2125
diff
changeset
|
3265 SafepointSynchronize::is_at_safepoint(), |
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3266 "must be executed at a safepoint"); |
0 | 3267 if (JvmtiEnv::environments_might_exist()) { |
3268 JvmtiEnvIterator it; | |
3269 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
3270 JvmtiTagMap* tag_map = env->tag_map(); | |
3271 if (tag_map != NULL && !tag_map->is_empty()) { | |
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3272 tag_map->do_weak_oops(is_alive, f); |
0 | 3273 } |
3274 } | |
3275 } | |
3276 } | |
3277 | |
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3278 void JvmtiTagMap::do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f) { |
0 | 3279 |
3280 // does this environment have the OBJECT_FREE event enabled | |
3281 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
3282 | |
3283 // counters used for trace message | |
3284 int freed = 0; | |
3285 int moved = 0; | |
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3286 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3287 JvmtiTagHashmap* hashmap = this->hashmap(); |
0 | 3288 |
3289 // reenable sizing (if disabled) | |
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3290 hashmap->set_resizing_enabled(true); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3291 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3292 // if the hashmap is empty then we can skip it |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3293 if (hashmap->_entry_count == 0) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3294 return; |
0 | 3295 } |
3296 | |
2125
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3297 // now iterate through each entry in the table |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3298 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3299 JvmtiTagHashmapEntry** table = hashmap->table(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3300 int size = hashmap->size(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3301 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
3302 JvmtiTagHashmapEntry* delayed_add = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3303 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3304 for (int pos = 0; pos < size; ++pos) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3305 JvmtiTagHashmapEntry* entry = table[pos]; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3306 JvmtiTagHashmapEntry* prev = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3307 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3308 while (entry != NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3309 JvmtiTagHashmapEntry* next = entry->next(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
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diff
changeset
|
3310 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3311 oop* obj = entry->object_addr(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3312 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3313 // has object been GC'ed |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3314 if (!is_alive->do_object_b(entry->object())) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3315 // grab the tag |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3316 jlong tag = entry->tag(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3317 guarantee(tag != 0, "checking"); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3318 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3319 // remove GC'ed entry from hashmap and return the |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3320 // entry to the free list |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3321 hashmap->remove(prev, pos, entry); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3322 destroy_entry(entry); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3323 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3324 // post the event to the profiler |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3325 if (post_object_free) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3326 JvmtiExport::post_object_free(env(), tag); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3327 } |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3328 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3329 ++freed; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3330 } else { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3331 f->do_oop(entry->object_addr()); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3332 oop new_oop = entry->object(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3333 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3334 // 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
|
3335 // entry to its new location. |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3336 unsigned int new_pos = JvmtiTagHashmap::hash(new_oop, size); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3337 if (new_pos != (unsigned int)pos) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3338 if (prev == NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3339 table[pos] = next; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3340 } else { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3341 prev->set_next(next); |
0 | 3342 } |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3343 if (new_pos < (unsigned int)pos) { |
0 | 3344 entry->set_next(table[new_pos]); |
3345 table[new_pos] = entry; | |
3346 } else { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3347 // Delay adding this entry to it's new position as we'd end up |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3348 // hitting it again during this iteration. |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3349 entry->set_next(delayed_add); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3350 delayed_add = entry; |
0 | 3351 } |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3352 moved++; |
0 | 3353 } else { |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3354 // object didn't move |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3355 prev = entry; |
0 | 3356 } |
3357 } | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3358 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3359 entry = next; |
0 | 3360 } |
3361 } | |
3362 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3363 // Re-add all the entries which were kept aside |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3364 while (delayed_add != NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3365 JvmtiTagHashmapEntry* next = delayed_add->next(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3366 unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3367 delayed_add->set_next(table[pos]); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3368 table[pos] = delayed_add; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3369 delayed_add = next; |
0 | 3370 } |
3371 | |
3372 // stats | |
3373 if (TraceJVMTIObjectTagging) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3374 int post_total = hashmap->_entry_count; |
0 | 3375 int pre_total = post_total + freed; |
3376 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3377 tty->print_cr("(%d->%d, %d freed, %d total moves)", |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3378 pre_total, post_total, freed, moved); |
0 | 3379 } |
3380 } |