Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiTagMap.cpp @ 7183:b2dbd323c668
8003848: Make ConstMethod::generic_signature_index optional and move Method::_max_stack to ConstMethod.
Summary: Make ConstMethod::generic_signature_index optional and move Method::_max_stack to ConstMethod.
Reviewed-by: bdelsart, sspitsyn, coleenp
author | jiangli |
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date | Tue, 27 Nov 2012 17:03:56 -0500 |
parents | 070d523b96a7 |
children | db9981fd3124 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "jvmtifiles/jvmtiEnv.hpp" | |
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30 #include "oops/instanceMirrorKlass.hpp" |
1972 | 31 #include "oops/objArrayKlass.hpp" |
32 #include "oops/oop.inline2.hpp" | |
33 #include "prims/jvmtiEventController.hpp" | |
34 #include "prims/jvmtiEventController.inline.hpp" | |
35 #include "prims/jvmtiExport.hpp" | |
36 #include "prims/jvmtiImpl.hpp" | |
37 #include "prims/jvmtiTagMap.hpp" | |
38 #include "runtime/biasedLocking.hpp" | |
39 #include "runtime/javaCalls.hpp" | |
40 #include "runtime/jniHandles.hpp" | |
41 #include "runtime/mutex.hpp" | |
42 #include "runtime/mutexLocker.hpp" | |
43 #include "runtime/reflectionUtils.hpp" | |
44 #include "runtime/vframe.hpp" | |
45 #include "runtime/vmThread.hpp" | |
46 #include "runtime/vm_operations.hpp" | |
47 #include "services/serviceUtil.hpp" | |
48 #ifndef SERIALGC | |
49 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
50 #endif | |
0 | 51 |
52 // JvmtiTagHashmapEntry | |
53 // | |
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54 // Each entry encapsulates a reference to the tagged object |
0 | 55 // and the tag value. In addition an entry includes a next pointer which |
56 // is used to chain entries together. | |
57 | |
6197 | 58 class JvmtiTagHashmapEntry : public CHeapObj<mtInternal> { |
0 | 59 private: |
60 friend class JvmtiTagMap; | |
61 | |
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62 oop _object; // tagged object |
0 | 63 jlong _tag; // the tag |
64 JvmtiTagHashmapEntry* _next; // next on the list | |
65 | |
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66 inline void init(oop object, jlong tag) { |
0 | 67 _object = object; |
68 _tag = tag; | |
69 _next = NULL; | |
70 } | |
71 | |
72 // constructor | |
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73 JvmtiTagHashmapEntry(oop object, jlong tag) { init(object, tag); } |
0 | 74 |
75 public: | |
76 | |
77 // accessor methods | |
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78 inline oop object() const { return _object; } |
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79 inline oop* object_addr() { return &_object; } |
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80 inline jlong tag() const { return _tag; } |
0 | 81 |
82 inline void set_tag(jlong tag) { | |
83 assert(tag != 0, "can't be zero"); | |
84 _tag = tag; | |
85 } | |
86 | |
87 inline JvmtiTagHashmapEntry* next() const { return _next; } | |
88 inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; } | |
89 }; | |
90 | |
91 | |
92 // JvmtiTagHashmap | |
93 // | |
94 // A hashmap is essentially a table of pointers to entries. Entries | |
95 // are hashed to a location, or position in the table, and then | |
96 // chained from that location. The "key" for hashing is address of | |
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97 // the object, or oop. The "value" is the tag value. |
0 | 98 // |
99 // A hashmap maintains a count of the number entries in the hashmap | |
100 // and resizes if the number of entries exceeds a given threshold. | |
101 // The threshold is specified as a percentage of the size - for | |
102 // example a threshold of 0.75 will trigger the hashmap to resize | |
103 // if the number of entries is >75% of table size. | |
104 // | |
105 // A hashmap provides functions for adding, removing, and finding | |
106 // entries. It also provides a function to iterate over all entries | |
107 // in the hashmap. | |
108 | |
6197 | 109 class JvmtiTagHashmap : public CHeapObj<mtInternal> { |
0 | 110 private: |
111 friend class JvmtiTagMap; | |
112 | |
113 enum { | |
114 small_trace_threshold = 10000, // threshold for tracing | |
115 medium_trace_threshold = 100000, | |
116 large_trace_threshold = 1000000, | |
117 initial_trace_threshold = small_trace_threshold | |
118 }; | |
119 | |
120 static int _sizes[]; // array of possible hashmap sizes | |
121 int _size; // actual size of the table | |
122 int _size_index; // index into size table | |
123 | |
124 int _entry_count; // number of entries in the hashmap | |
125 | |
126 float _load_factor; // load factor as a % of the size | |
127 int _resize_threshold; // computed threshold to trigger resizing. | |
128 bool _resizing_enabled; // indicates if hashmap can resize | |
129 | |
130 int _trace_threshold; // threshold for trace messages | |
131 | |
132 JvmtiTagHashmapEntry** _table; // the table of entries. | |
133 | |
134 // private accessors | |
135 int resize_threshold() const { return _resize_threshold; } | |
136 int trace_threshold() const { return _trace_threshold; } | |
137 | |
138 // initialize the hashmap | |
139 void init(int size_index=0, float load_factor=4.0f) { | |
140 int initial_size = _sizes[size_index]; | |
141 _size_index = size_index; | |
142 _size = initial_size; | |
143 _entry_count = 0; | |
144 if (TraceJVMTIObjectTagging) { | |
145 _trace_threshold = initial_trace_threshold; | |
146 } else { | |
147 _trace_threshold = -1; | |
148 } | |
149 _load_factor = load_factor; | |
150 _resize_threshold = (int)(_load_factor * _size); | |
151 _resizing_enabled = true; | |
152 size_t s = initial_size * sizeof(JvmtiTagHashmapEntry*); | |
6197 | 153 _table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
0 | 154 if (_table == NULL) { |
155 vm_exit_out_of_memory(s, "unable to allocate initial hashtable for jvmti object tags"); | |
156 } | |
157 for (int i=0; i<initial_size; i++) { | |
158 _table[i] = NULL; | |
159 } | |
160 } | |
161 | |
162 // hash a given key (oop) with the specified size | |
163 static unsigned int hash(oop key, int size) { | |
164 // shift right to get better distribution (as these bits will be zero | |
165 // with aligned addresses) | |
166 unsigned int addr = (unsigned int)((intptr_t)key); | |
167 #ifdef _LP64 | |
168 return (addr >> 3) % size; | |
169 #else | |
170 return (addr >> 2) % size; | |
171 #endif | |
172 } | |
173 | |
174 // hash a given key (oop) | |
175 unsigned int hash(oop key) { | |
176 return hash(key, _size); | |
177 } | |
178 | |
179 // resize the hashmap - allocates a large table and re-hashes | |
180 // all entries into the new table. | |
181 void resize() { | |
182 int new_size_index = _size_index+1; | |
183 int new_size = _sizes[new_size_index]; | |
184 if (new_size < 0) { | |
185 // hashmap already at maximum capacity | |
186 return; | |
187 } | |
188 | |
189 // allocate new table | |
190 size_t s = new_size * sizeof(JvmtiTagHashmapEntry*); | |
6197 | 191 JvmtiTagHashmapEntry** new_table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
0 | 192 if (new_table == NULL) { |
193 warning("unable to allocate larger hashtable for jvmti object tags"); | |
194 set_resizing_enabled(false); | |
195 return; | |
196 } | |
197 | |
198 // initialize new table | |
199 int i; | |
200 for (i=0; i<new_size; i++) { | |
201 new_table[i] = NULL; | |
202 } | |
203 | |
204 // rehash all entries into the new table | |
205 for (i=0; i<_size; i++) { | |
206 JvmtiTagHashmapEntry* entry = _table[i]; | |
207 while (entry != NULL) { | |
208 JvmtiTagHashmapEntry* next = entry->next(); | |
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209 oop key = entry->object(); |
0 | 210 assert(key != NULL, "jni weak reference cleared!!"); |
211 unsigned int h = hash(key, new_size); | |
212 JvmtiTagHashmapEntry* anchor = new_table[h]; | |
213 if (anchor == NULL) { | |
214 new_table[h] = entry; | |
215 entry->set_next(NULL); | |
216 } else { | |
217 entry->set_next(anchor); | |
218 new_table[h] = entry; | |
219 } | |
220 entry = next; | |
221 } | |
222 } | |
223 | |
224 // free old table and update settings. | |
225 os::free((void*)_table); | |
226 _table = new_table; | |
227 _size_index = new_size_index; | |
228 _size = new_size; | |
229 | |
230 // compute new resize threshold | |
231 _resize_threshold = (int)(_load_factor * _size); | |
232 } | |
233 | |
234 | |
235 // internal remove function - remove an entry at a given position in the | |
236 // table. | |
237 inline void remove(JvmtiTagHashmapEntry* prev, int pos, JvmtiTagHashmapEntry* entry) { | |
238 assert(pos >= 0 && pos < _size, "out of range"); | |
239 if (prev == NULL) { | |
240 _table[pos] = entry->next(); | |
241 } else { | |
242 prev->set_next(entry->next()); | |
243 } | |
244 assert(_entry_count > 0, "checking"); | |
245 _entry_count--; | |
246 } | |
247 | |
248 // resizing switch | |
249 bool is_resizing_enabled() const { return _resizing_enabled; } | |
250 void set_resizing_enabled(bool enable) { _resizing_enabled = enable; } | |
251 | |
252 // debugging | |
253 void print_memory_usage(); | |
254 void compute_next_trace_threshold(); | |
255 | |
256 public: | |
257 | |
258 // create a JvmtiTagHashmap of a preferred size and optionally a load factor. | |
259 // The preferred size is rounded down to an actual size. | |
260 JvmtiTagHashmap(int size, float load_factor=0.0f) { | |
261 int i=0; | |
262 while (_sizes[i] < size) { | |
263 if (_sizes[i] < 0) { | |
264 assert(i > 0, "sanity check"); | |
265 i--; | |
266 break; | |
267 } | |
268 i++; | |
269 } | |
270 | |
271 // if a load factor is specified then use it, otherwise use default | |
272 if (load_factor > 0.01f) { | |
273 init(i, load_factor); | |
274 } else { | |
275 init(i); | |
276 } | |
277 } | |
278 | |
279 // create a JvmtiTagHashmap with default settings | |
280 JvmtiTagHashmap() { | |
281 init(); | |
282 } | |
283 | |
284 // release table when JvmtiTagHashmap destroyed | |
285 ~JvmtiTagHashmap() { | |
286 if (_table != NULL) { | |
287 os::free((void*)_table); | |
288 _table = NULL; | |
289 } | |
290 } | |
291 | |
292 // accessors | |
293 int size() const { return _size; } | |
294 JvmtiTagHashmapEntry** table() const { return _table; } | |
295 int entry_count() const { return _entry_count; } | |
296 | |
297 // find an entry in the hashmap, returns NULL if not found. | |
298 inline JvmtiTagHashmapEntry* find(oop key) { | |
299 unsigned int h = hash(key); | |
300 JvmtiTagHashmapEntry* entry = _table[h]; | |
301 while (entry != NULL) { | |
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302 if (entry->object() == key) { |
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303 return entry; |
0 | 304 } |
305 entry = entry->next(); | |
306 } | |
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307 return NULL; |
0 | 308 } |
309 | |
310 | |
311 // add a new entry to hashmap | |
312 inline void add(oop key, JvmtiTagHashmapEntry* entry) { | |
313 assert(key != NULL, "checking"); | |
314 assert(find(key) == NULL, "duplicate detected"); | |
315 unsigned int h = hash(key); | |
316 JvmtiTagHashmapEntry* anchor = _table[h]; | |
317 if (anchor == NULL) { | |
318 _table[h] = entry; | |
319 entry->set_next(NULL); | |
320 } else { | |
321 entry->set_next(anchor); | |
322 _table[h] = entry; | |
323 } | |
324 | |
325 _entry_count++; | |
326 if (trace_threshold() > 0 && entry_count() >= trace_threshold()) { | |
327 assert(TraceJVMTIObjectTagging, "should only get here when tracing"); | |
328 print_memory_usage(); | |
329 compute_next_trace_threshold(); | |
330 } | |
331 | |
332 // if the number of entries exceed the threshold then resize | |
333 if (entry_count() > resize_threshold() && is_resizing_enabled()) { | |
334 resize(); | |
335 } | |
336 } | |
337 | |
338 // remove an entry with the given key. | |
339 inline JvmtiTagHashmapEntry* remove(oop key) { | |
340 unsigned int h = hash(key); | |
341 JvmtiTagHashmapEntry* entry = _table[h]; | |
342 JvmtiTagHashmapEntry* prev = NULL; | |
343 while (entry != NULL) { | |
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344 if (key == entry->object()) { |
0 | 345 break; |
346 } | |
347 prev = entry; | |
348 entry = entry->next(); | |
349 } | |
350 if (entry != NULL) { | |
351 remove(prev, h, entry); | |
352 } | |
353 return entry; | |
354 } | |
355 | |
356 // iterate over all entries in the hashmap | |
357 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); | |
358 }; | |
359 | |
360 // possible hashmap sizes - odd primes that roughly double in size. | |
361 // To avoid excessive resizing the odd primes from 4801-76831 and | |
362 // 76831-307261 have been removed. The list must be terminated by -1. | |
363 int JvmtiTagHashmap::_sizes[] = { 4801, 76831, 307261, 614563, 1228891, | |
364 2457733, 4915219, 9830479, 19660831, 39321619, 78643219, -1 }; | |
365 | |
366 | |
367 // A supporting class for iterating over all entries in Hashmap | |
368 class JvmtiTagHashmapEntryClosure { | |
369 public: | |
370 virtual void do_entry(JvmtiTagHashmapEntry* entry) = 0; | |
371 }; | |
372 | |
373 | |
374 // iterate over all entries in the hashmap | |
375 void JvmtiTagHashmap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
376 for (int i=0; i<_size; i++) { | |
377 JvmtiTagHashmapEntry* entry = _table[i]; | |
378 JvmtiTagHashmapEntry* prev = NULL; | |
379 while (entry != NULL) { | |
380 // obtain the next entry before invoking do_entry - this is | |
381 // necessary because do_entry may remove the entry from the | |
382 // hashmap. | |
383 JvmtiTagHashmapEntry* next = entry->next(); | |
384 closure->do_entry(entry); | |
385 entry = next; | |
386 } | |
387 } | |
388 } | |
389 | |
390 // debugging | |
391 void JvmtiTagHashmap::print_memory_usage() { | |
392 intptr_t p = (intptr_t)this; | |
393 tty->print("[JvmtiTagHashmap @ " INTPTR_FORMAT, p); | |
394 | |
395 // table + entries in KB | |
396 int hashmap_usage = (size()*sizeof(JvmtiTagHashmapEntry*) + | |
397 entry_count()*sizeof(JvmtiTagHashmapEntry))/K; | |
398 | |
399 int weak_globals_usage = (int)(JNIHandles::weak_global_handle_memory_usage()/K); | |
400 tty->print_cr(", %d entries (%d KB) <JNI weak globals: %d KB>]", | |
401 entry_count(), hashmap_usage, weak_globals_usage); | |
402 } | |
403 | |
404 // compute threshold for the next trace message | |
405 void JvmtiTagHashmap::compute_next_trace_threshold() { | |
406 if (trace_threshold() < medium_trace_threshold) { | |
407 _trace_threshold += small_trace_threshold; | |
408 } else { | |
409 if (trace_threshold() < large_trace_threshold) { | |
410 _trace_threshold += medium_trace_threshold; | |
411 } else { | |
412 _trace_threshold += large_trace_threshold; | |
413 } | |
414 } | |
415 } | |
416 | |
417 // create a JvmtiTagMap | |
418 JvmtiTagMap::JvmtiTagMap(JvmtiEnv* env) : | |
419 _env(env), | |
420 _lock(Mutex::nonleaf+2, "JvmtiTagMap._lock", false), | |
421 _free_entries(NULL), | |
422 _free_entries_count(0) | |
423 { | |
424 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
425 assert(((JvmtiEnvBase *)env)->tag_map() == NULL, "tag map already exists for environment"); | |
426 | |
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427 _hashmap = new JvmtiTagHashmap(); |
0 | 428 |
429 // finally add us to the environment | |
430 ((JvmtiEnvBase *)env)->set_tag_map(this); | |
431 } | |
432 | |
433 | |
434 // destroy a JvmtiTagMap | |
435 JvmtiTagMap::~JvmtiTagMap() { | |
436 | |
437 // no lock acquired as we assume the enclosing environment is | |
438 // also being destroryed. | |
439 ((JvmtiEnvBase *)_env)->set_tag_map(NULL); | |
440 | |
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441 JvmtiTagHashmapEntry** table = _hashmap->table(); |
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442 for (int j = 0; j < _hashmap->size(); j++) { |
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443 JvmtiTagHashmapEntry* entry = table[j]; |
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444 while (entry != NULL) { |
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445 JvmtiTagHashmapEntry* next = entry->next(); |
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446 delete entry; |
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447 entry = next; |
0 | 448 } |
449 } | |
450 | |
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451 // finally destroy the hashmap |
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452 delete _hashmap; |
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453 _hashmap = NULL; |
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454 |
0 | 455 // remove any entries on the free list |
456 JvmtiTagHashmapEntry* entry = _free_entries; | |
457 while (entry != NULL) { | |
458 JvmtiTagHashmapEntry* next = entry->next(); | |
459 delete entry; | |
460 entry = next; | |
461 } | |
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462 _free_entries = NULL; |
0 | 463 } |
464 | |
465 // create a hashmap entry | |
466 // - if there's an entry on the (per-environment) free list then this | |
467 // is returned. Otherwise an new entry is allocated. | |
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468 JvmtiTagHashmapEntry* JvmtiTagMap::create_entry(oop ref, jlong tag) { |
0 | 469 assert(Thread::current()->is_VM_thread() || is_locked(), "checking"); |
470 JvmtiTagHashmapEntry* entry; | |
471 if (_free_entries == NULL) { | |
472 entry = new JvmtiTagHashmapEntry(ref, tag); | |
473 } else { | |
474 assert(_free_entries_count > 0, "mismatched _free_entries_count"); | |
475 _free_entries_count--; | |
476 entry = _free_entries; | |
477 _free_entries = entry->next(); | |
478 entry->init(ref, tag); | |
479 } | |
480 return entry; | |
481 } | |
482 | |
483 // destroy an entry by returning it to the free list | |
484 void JvmtiTagMap::destroy_entry(JvmtiTagHashmapEntry* entry) { | |
485 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
486 // limit the size of the free list | |
487 if (_free_entries_count >= max_free_entries) { | |
488 delete entry; | |
489 } else { | |
490 entry->set_next(_free_entries); | |
491 _free_entries = entry; | |
492 _free_entries_count++; | |
493 } | |
494 } | |
495 | |
496 // returns the tag map for the given environments. If the tag map | |
497 // doesn't exist then it is created. | |
498 JvmtiTagMap* JvmtiTagMap::tag_map_for(JvmtiEnv* env) { | |
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499 JvmtiTagMap* tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 500 if (tag_map == NULL) { |
501 MutexLocker mu(JvmtiThreadState_lock); | |
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502 tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 503 if (tag_map == NULL) { |
504 tag_map = new JvmtiTagMap(env); | |
505 } | |
506 } else { | |
507 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
508 } | |
509 return tag_map; | |
510 } | |
511 | |
512 // iterate over all entries in the tag map. | |
513 void JvmtiTagMap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
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514 hashmap()->entry_iterate(closure); |
0 | 515 } |
516 | |
517 // returns true if the hashmaps are empty | |
518 bool JvmtiTagMap::is_empty() { | |
519 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
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520 return hashmap()->entry_count() == 0; |
0 | 521 } |
522 | |
523 | |
524 // Return the tag value for an object, or 0 if the object is | |
525 // not tagged | |
526 // | |
527 static inline jlong tag_for(JvmtiTagMap* tag_map, oop o) { | |
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528 JvmtiTagHashmapEntry* entry = tag_map->hashmap()->find(o); |
0 | 529 if (entry == NULL) { |
530 return 0; | |
531 } else { | |
532 return entry->tag(); | |
533 } | |
534 } | |
535 | |
536 | |
537 // A CallbackWrapper is a support class for querying and tagging an object | |
538 // around a callback to a profiler. The constructor does pre-callback | |
539 // work to get the tag value, klass tag value, ... and the destructor | |
540 // does the post-callback work of tagging or untagging the object. | |
541 // | |
542 // { | |
543 // CallbackWrapper wrapper(tag_map, o); | |
544 // | |
545 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
546 // | |
547 // } // wrapper goes out of scope here which results in the destructor | |
548 // checking to see if the object has been tagged, untagged, or the | |
549 // tag value has changed. | |
550 // | |
551 class CallbackWrapper : public StackObj { | |
552 private: | |
553 JvmtiTagMap* _tag_map; | |
554 JvmtiTagHashmap* _hashmap; | |
555 JvmtiTagHashmapEntry* _entry; | |
556 oop _o; | |
557 jlong _obj_size; | |
558 jlong _obj_tag; | |
559 jlong _klass_tag; | |
560 | |
561 protected: | |
562 JvmtiTagMap* tag_map() const { return _tag_map; } | |
563 | |
564 // invoked post-callback to tag, untag, or update the tag of an object | |
565 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
566 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
567 public: | |
568 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
569 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
570 "MT unsafe or must be VM thread"); | |
571 | |
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572 // object to tag |
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573 _o = o; |
0 | 574 |
575 // object size | |
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576 _obj_size = (jlong)_o->size() * wordSize; |
0 | 577 |
578 // record the context | |
579 _tag_map = tag_map; | |
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580 _hashmap = tag_map->hashmap(); |
0 | 581 _entry = _hashmap->find(_o); |
582 | |
583 // get object tag | |
584 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
585 | |
586 // get the class and the class's tag value | |
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587 assert(SystemDictionary::Class_klass()->oop_is_instanceMirror(), "Is not?"); |
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588 |
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589 _klass_tag = tag_for(tag_map, _o->klass()->java_mirror()); |
0 | 590 } |
591 | |
592 ~CallbackWrapper() { | |
593 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
594 } | |
595 | |
596 inline jlong* obj_tag_p() { return &_obj_tag; } | |
597 inline jlong obj_size() const { return _obj_size; } | |
598 inline jlong obj_tag() const { return _obj_tag; } | |
599 inline jlong klass_tag() const { return _klass_tag; } | |
600 }; | |
601 | |
602 | |
603 | |
604 // callback post-callback to tag, untag, or update the tag of an object | |
605 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
606 JvmtiTagHashmap* hashmap, | |
607 JvmtiTagHashmapEntry* entry, | |
608 jlong obj_tag) { | |
609 if (entry == NULL) { | |
610 if (obj_tag != 0) { | |
611 // callback has tagged the object | |
612 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
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613 entry = tag_map()->create_entry(o, obj_tag); |
0 | 614 hashmap->add(o, entry); |
615 } | |
616 } else { | |
617 // object was previously tagged - the callback may have untagged | |
618 // the object or changed the tag value | |
619 if (obj_tag == 0) { | |
620 | |
621 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
622 assert(entry_removed == entry, "checking"); | |
623 tag_map()->destroy_entry(entry); | |
624 | |
625 } else { | |
626 if (obj_tag != entry->tag()) { | |
627 entry->set_tag(obj_tag); | |
628 } | |
629 } | |
630 } | |
631 } | |
632 | |
633 // An extended CallbackWrapper used when reporting an object reference | |
634 // to the agent. | |
635 // | |
636 // { | |
637 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
638 // | |
639 // (*callback)(wrapper.klass_tag(), | |
640 // wrapper.obj_size(), | |
641 // wrapper.obj_tag_p() | |
642 // wrapper.referrer_tag_p(), ...) | |
643 // | |
644 // } // wrapper goes out of scope here which results in the destructor | |
645 // checking to see if the referrer object has been tagged, untagged, | |
646 // or the tag value has changed. | |
647 // | |
648 class TwoOopCallbackWrapper : public CallbackWrapper { | |
649 private: | |
650 bool _is_reference_to_self; | |
651 JvmtiTagHashmap* _referrer_hashmap; | |
652 JvmtiTagHashmapEntry* _referrer_entry; | |
653 oop _referrer; | |
654 jlong _referrer_obj_tag; | |
655 jlong _referrer_klass_tag; | |
656 jlong* _referrer_tag_p; | |
657 | |
658 bool is_reference_to_self() const { return _is_reference_to_self; } | |
659 | |
660 public: | |
661 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
662 CallbackWrapper(tag_map, o) | |
663 { | |
664 // self reference needs to be handled in a special way | |
665 _is_reference_to_self = (referrer == o); | |
666 | |
667 if (_is_reference_to_self) { | |
668 _referrer_klass_tag = klass_tag(); | |
669 _referrer_tag_p = obj_tag_p(); | |
670 } else { | |
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671 _referrer = referrer; |
0 | 672 // record the context |
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673 _referrer_hashmap = tag_map->hashmap(); |
0 | 674 _referrer_entry = _referrer_hashmap->find(_referrer); |
675 | |
676 // get object tag | |
677 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
678 _referrer_tag_p = &_referrer_obj_tag; | |
679 | |
680 // get referrer class tag. | |
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681 _referrer_klass_tag = tag_for(tag_map, _referrer->klass()->java_mirror()); |
0 | 682 } |
683 } | |
684 | |
685 ~TwoOopCallbackWrapper() { | |
686 if (!is_reference_to_self()){ | |
687 post_callback_tag_update(_referrer, | |
688 _referrer_hashmap, | |
689 _referrer_entry, | |
690 _referrer_obj_tag); | |
691 } | |
692 } | |
693 | |
694 // address of referrer tag | |
695 // (for a self reference this will return the same thing as obj_tag_p()) | |
696 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
697 | |
698 // referrer's class tag | |
699 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
700 }; | |
701 | |
702 // tag an object | |
703 // | |
704 // This function is performance critical. If many threads attempt to tag objects | |
705 // around the same time then it's possible that the Mutex associated with the | |
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706 // tag map will be a hot lock. |
0 | 707 void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
708 MutexLocker ml(lock()); | |
709 | |
710 // resolve the object | |
711 oop o = JNIHandles::resolve_non_null(object); | |
712 | |
713 // see if the object is already tagged | |
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714 JvmtiTagHashmap* hashmap = _hashmap; |
0 | 715 JvmtiTagHashmapEntry* entry = hashmap->find(o); |
716 | |
717 // if the object is not already tagged then we tag it | |
718 if (entry == NULL) { | |
719 if (tag != 0) { | |
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720 entry = create_entry(o, tag); |
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721 hashmap->add(o, entry); |
0 | 722 } else { |
723 // no-op | |
724 } | |
725 } else { | |
726 // if the object is already tagged then we either update | |
727 // the tag (if a new tag value has been provided) | |
728 // or remove the object if the new tag value is 0. | |
729 if (tag == 0) { | |
730 hashmap->remove(o); | |
731 destroy_entry(entry); | |
732 } else { | |
733 entry->set_tag(tag); | |
734 } | |
735 } | |
736 } | |
737 | |
738 // get the tag for an object | |
739 jlong JvmtiTagMap::get_tag(jobject object) { | |
740 MutexLocker ml(lock()); | |
741 | |
742 // resolve the object | |
743 oop o = JNIHandles::resolve_non_null(object); | |
744 | |
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745 return tag_for(this, o); |
0 | 746 } |
747 | |
748 | |
749 // Helper class used to describe the static or instance fields of a class. | |
750 // For each field it holds the field index (as defined by the JVMTI specification), | |
751 // the field type, and the offset. | |
752 | |
6197 | 753 class ClassFieldDescriptor: public CHeapObj<mtInternal> { |
0 | 754 private: |
755 int _field_index; | |
756 int _field_offset; | |
757 char _field_type; | |
758 public: | |
759 ClassFieldDescriptor(int index, char type, int offset) : | |
760 _field_index(index), _field_type(type), _field_offset(offset) { | |
761 } | |
762 int field_index() const { return _field_index; } | |
763 char field_type() const { return _field_type; } | |
764 int field_offset() const { return _field_offset; } | |
765 }; | |
766 | |
6197 | 767 class ClassFieldMap: public CHeapObj<mtInternal> { |
0 | 768 private: |
769 enum { | |
770 initial_field_count = 5 | |
771 }; | |
772 | |
773 // list of field descriptors | |
774 GrowableArray<ClassFieldDescriptor*>* _fields; | |
775 | |
776 // constructor | |
777 ClassFieldMap(); | |
778 | |
779 // add a field | |
780 void add(int index, char type, int offset); | |
781 | |
782 // returns the field count for the given class | |
783 static int compute_field_count(instanceKlassHandle ikh); | |
784 | |
785 public: | |
786 ~ClassFieldMap(); | |
787 | |
788 // access | |
789 int field_count() { return _fields->length(); } | |
790 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
791 | |
792 // functions to create maps of static or instance fields | |
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793 static ClassFieldMap* create_map_of_static_fields(Klass* k); |
0 | 794 static ClassFieldMap* create_map_of_instance_fields(oop obj); |
795 }; | |
796 | |
797 ClassFieldMap::ClassFieldMap() { | |
6197 | 798 _fields = new (ResourceObj::C_HEAP, mtInternal) |
799 GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
0 | 800 } |
801 | |
802 ClassFieldMap::~ClassFieldMap() { | |
803 for (int i=0; i<_fields->length(); i++) { | |
804 delete _fields->at(i); | |
805 } | |
806 delete _fields; | |
807 } | |
808 | |
809 void ClassFieldMap::add(int index, char type, int offset) { | |
810 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
811 _fields->append(field); | |
812 } | |
813 | |
814 // Returns a heap allocated ClassFieldMap to describe the static fields | |
815 // of the given class. | |
816 // | |
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817 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(Klass* k) { |
0 | 818 HandleMark hm; |
819 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
820 | |
821 // create the field map | |
822 ClassFieldMap* field_map = new ClassFieldMap(); | |
823 | |
824 FilteredFieldStream f(ikh, false, false); | |
825 int max_field_index = f.field_count()-1; | |
826 | |
827 int index = 0; | |
828 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
829 // ignore instance fields | |
830 if (!fld.access_flags().is_static()) { | |
831 continue; | |
832 } | |
833 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
834 } | |
835 return field_map; | |
836 } | |
837 | |
838 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
839 // of the given class. All instance fields are included (this means public | |
840 // and private fields declared in superclasses and superinterfaces too). | |
841 // | |
842 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
843 HandleMark hm; | |
844 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
845 | |
846 // create the field map | |
847 ClassFieldMap* field_map = new ClassFieldMap(); | |
848 | |
849 FilteredFieldStream f(ikh, false, false); | |
850 | |
851 int max_field_index = f.field_count()-1; | |
852 | |
853 int index = 0; | |
854 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
855 // ignore static fields | |
856 if (fld.access_flags().is_static()) { | |
857 continue; | |
858 } | |
859 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
860 } | |
861 | |
862 return field_map; | |
863 } | |
864 | |
865 // Helper class used to cache a ClassFileMap for the instance fields of | |
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866 // a cache. A JvmtiCachedClassFieldMap can be cached by an InstanceKlass during |
0 | 867 // heap iteration and avoid creating a field map for each object in the heap |
868 // (only need to create the map when the first instance of a class is encountered). | |
869 // | |
6197 | 870 class JvmtiCachedClassFieldMap : public CHeapObj<mtInternal> { |
0 | 871 private: |
872 enum { | |
873 initial_class_count = 200 | |
874 }; | |
875 ClassFieldMap* _field_map; | |
876 | |
877 ClassFieldMap* field_map() const { return _field_map; } | |
878 | |
879 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
880 ~JvmtiCachedClassFieldMap(); | |
881 | |
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882 static GrowableArray<InstanceKlass*>* _class_list; |
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883 static void add_to_class_list(InstanceKlass* ik); |
0 | 884 |
885 public: | |
886 // returns the field map for a given object (returning map cached | |
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887 // by InstanceKlass if possible |
0 | 888 static ClassFieldMap* get_map_of_instance_fields(oop obj); |
889 | |
890 // removes the field map from all instanceKlasses - should be | |
891 // called before VM operation completes | |
892 static void clear_cache(); | |
893 | |
894 // returns the number of ClassFieldMap cached by instanceKlasses | |
895 static int cached_field_map_count(); | |
896 }; | |
897 | |
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898 GrowableArray<InstanceKlass*>* JvmtiCachedClassFieldMap::_class_list; |
0 | 899 |
900 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
901 _field_map = field_map; | |
902 } | |
903 | |
904 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
905 if (_field_map != NULL) { | |
906 delete _field_map; | |
907 } | |
908 } | |
909 | |
910 // Marker class to ensure that the class file map cache is only used in a defined | |
911 // scope. | |
912 class ClassFieldMapCacheMark : public StackObj { | |
913 private: | |
914 static bool _is_active; | |
915 public: | |
916 ClassFieldMapCacheMark() { | |
917 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
918 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
919 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
920 _is_active = true; | |
921 } | |
922 ~ClassFieldMapCacheMark() { | |
923 JvmtiCachedClassFieldMap::clear_cache(); | |
924 _is_active = false; | |
925 } | |
926 static bool is_active() { return _is_active; } | |
927 }; | |
928 | |
929 bool ClassFieldMapCacheMark::_is_active; | |
930 | |
931 | |
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932 // record that the given InstanceKlass is caching a field map |
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933 void JvmtiCachedClassFieldMap::add_to_class_list(InstanceKlass* ik) { |
0 | 934 if (_class_list == NULL) { |
6197 | 935 _class_list = new (ResourceObj::C_HEAP, mtInternal) |
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936 GrowableArray<InstanceKlass*>(initial_class_count, true); |
0 | 937 } |
938 _class_list->push(ik); | |
939 } | |
940 | |
941 // returns the instance field map for the given object | |
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942 // (returns field map cached by the InstanceKlass if possible) |
0 | 943 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { |
944 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
945 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
946 | |
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947 Klass* k = obj->klass(); |
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948 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 949 |
950 // return cached map if possible | |
951 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
952 if (cached_map != NULL) { | |
953 assert(cached_map->field_map() != NULL, "missing field list"); | |
954 return cached_map->field_map(); | |
955 } else { | |
956 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
957 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
958 ik->set_jvmti_cached_class_field_map(cached_map); | |
959 add_to_class_list(ik); | |
960 return field_map; | |
961 } | |
962 } | |
963 | |
964 // remove the fields maps cached from all instanceKlasses | |
965 void JvmtiCachedClassFieldMap::clear_cache() { | |
966 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
967 if (_class_list != NULL) { | |
968 for (int i = 0; i < _class_list->length(); i++) { | |
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969 InstanceKlass* ik = _class_list->at(i); |
0 | 970 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); |
971 assert(cached_map != NULL, "should not be NULL"); | |
972 ik->set_jvmti_cached_class_field_map(NULL); | |
973 delete cached_map; // deletes the encapsulated field map | |
974 } | |
975 delete _class_list; | |
976 _class_list = NULL; | |
977 } | |
978 } | |
979 | |
980 // returns the number of ClassFieldMap cached by instanceKlasses | |
981 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
982 return (_class_list == NULL) ? 0 : _class_list->length(); | |
983 } | |
984 | |
985 // helper function to indicate if an object is filtered by its tag or class tag | |
986 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
987 jlong klass_tag, | |
988 int heap_filter) { | |
989 // apply the heap filter | |
990 if (obj_tag != 0) { | |
991 // filter out tagged objects | |
992 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
993 } else { | |
994 // filter out untagged objects | |
995 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
996 } | |
997 if (klass_tag != 0) { | |
998 // filter out objects with tagged classes | |
999 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
1000 } else { | |
1001 // filter out objects with untagged classes. | |
1002 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
1003 } | |
1004 return false; | |
1005 } | |
1006 | |
1007 // helper function to indicate if an object is filtered by a klass filter | |
1008 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
1009 if (!klass_filter.is_null()) { | |
1010 if (obj->klass() != klass_filter()) { | |
1011 return true; | |
1012 } | |
1013 } | |
1014 return false; | |
1015 } | |
1016 | |
1017 // helper function to tell if a field is a primitive field or not | |
1018 static inline bool is_primitive_field_type(char type) { | |
1019 return (type != 'L' && type != '['); | |
1020 } | |
1021 | |
1022 // helper function to copy the value from location addr to jvalue. | |
1023 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
1024 switch (value_type) { | |
1025 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
1026 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
1027 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
1028 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
1029 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
1030 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
1031 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
1032 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
1033 default: ShouldNotReachHere(); | |
1034 } | |
1035 } | |
1036 | |
1037 // helper function to invoke string primitive value callback | |
1038 // returns visit control flags | |
1039 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
1040 CallbackWrapper* wrapper, | |
1041 oop str, | |
1042 void* user_data) | |
1043 { | |
1142 | 1044 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 1045 |
1046 // get the string value and length | |
1047 // (string value may be offset from the base) | |
1048 int s_len = java_lang_String::length(str); | |
1049 typeArrayOop s_value = java_lang_String::value(str); | |
1050 int s_offset = java_lang_String::offset(str); | |
1051 jchar* value; | |
1052 if (s_len > 0) { | |
1053 value = s_value->char_at_addr(s_offset); | |
1054 } else { | |
1055 value = (jchar*) s_value->base(T_CHAR); | |
1056 } | |
1057 | |
1058 // invoke the callback | |
1059 return (*cb)(wrapper->klass_tag(), | |
1060 wrapper->obj_size(), | |
1061 wrapper->obj_tag_p(), | |
1062 value, | |
1063 (jint)s_len, | |
1064 user_data); | |
1065 } | |
1066 | |
1067 // helper function to invoke string primitive value callback | |
1068 // returns visit control flags | |
1069 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
1070 CallbackWrapper* wrapper, | |
1071 oop obj, | |
1072 void* user_data) | |
1073 { | |
1074 assert(obj->is_typeArray(), "not a primitive array"); | |
1075 | |
1076 // get base address of first element | |
1077 typeArrayOop array = typeArrayOop(obj); | |
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1078 BasicType type = TypeArrayKlass::cast(array->klass())->element_type(); |
0 | 1079 void* elements = array->base(type); |
1080 | |
1081 // jvmtiPrimitiveType is defined so this mapping is always correct | |
1082 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
1083 | |
1084 return (*cb)(wrapper->klass_tag(), | |
1085 wrapper->obj_size(), | |
1086 wrapper->obj_tag_p(), | |
1087 (jint)array->length(), | |
1088 elem_type, | |
1089 elements, | |
1090 user_data); | |
1091 } | |
1092 | |
1093 // helper function to invoke the primitive field callback for all static fields | |
1094 // of a given class | |
1095 static jint invoke_primitive_field_callback_for_static_fields | |
1096 (CallbackWrapper* wrapper, | |
1097 oop obj, | |
1098 jvmtiPrimitiveFieldCallback cb, | |
1099 void* user_data) | |
1100 { | |
1101 // for static fields only the index will be set | |
1102 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1103 | |
1142 | 1104 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
0 | 1105 if (java_lang_Class::is_primitive(obj)) { |
1106 return 0; | |
1107 } | |
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1108 Klass* klass = java_lang_Class::as_Klass(obj); |
0 | 1109 |
1110 // ignore classes for object and type arrays | |
1111 if (!klass->oop_is_instance()) { | |
1112 return 0; | |
1113 } | |
1114 | |
1115 // ignore classes which aren't linked yet | |
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1116 InstanceKlass* ik = InstanceKlass::cast(klass); |
0 | 1117 if (!ik->is_linked()) { |
1118 return 0; | |
1119 } | |
1120 | |
1121 // get the field map | |
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1122 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
0 | 1123 |
1124 // invoke the callback for each static primitive field | |
1125 for (int i=0; i<field_map->field_count(); i++) { | |
1126 ClassFieldDescriptor* field = field_map->field_at(i); | |
1127 | |
1128 // ignore non-primitive fields | |
1129 char type = field->field_type(); | |
1130 if (!is_primitive_field_type(type)) { | |
1131 continue; | |
1132 } | |
1133 // one-to-one mapping | |
1134 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1135 | |
1136 // get offset and field value | |
1137 int offset = field->field_offset(); | |
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1138 address addr = (address)klass->java_mirror() + offset; |
0 | 1139 jvalue value; |
1140 copy_to_jvalue(&value, addr, value_type); | |
1141 | |
1142 // field index | |
1143 reference_info.field.index = field->field_index(); | |
1144 | |
1145 // invoke the callback | |
1146 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
1147 &reference_info, | |
1148 wrapper->klass_tag(), | |
1149 wrapper->obj_tag_p(), | |
1150 value, | |
1151 value_type, | |
1152 user_data); | |
1153 if (res & JVMTI_VISIT_ABORT) { | |
1154 delete field_map; | |
1155 return res; | |
1156 } | |
1157 } | |
1158 | |
1159 delete field_map; | |
1160 return 0; | |
1161 } | |
1162 | |
1163 // helper function to invoke the primitive field callback for all instance fields | |
1164 // of a given object | |
1165 static jint invoke_primitive_field_callback_for_instance_fields( | |
1166 CallbackWrapper* wrapper, | |
1167 oop obj, | |
1168 jvmtiPrimitiveFieldCallback cb, | |
1169 void* user_data) | |
1170 { | |
1171 // for instance fields only the index will be set | |
1172 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1173 | |
1174 // get the map of the instance fields | |
1175 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
1176 | |
1177 // invoke the callback for each instance primitive field | |
1178 for (int i=0; i<fields->field_count(); i++) { | |
1179 ClassFieldDescriptor* field = fields->field_at(i); | |
1180 | |
1181 // ignore non-primitive fields | |
1182 char type = field->field_type(); | |
1183 if (!is_primitive_field_type(type)) { | |
1184 continue; | |
1185 } | |
1186 // one-to-one mapping | |
1187 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1188 | |
1189 // get offset and field value | |
1190 int offset = field->field_offset(); | |
1191 address addr = (address)obj + offset; | |
1192 jvalue value; | |
1193 copy_to_jvalue(&value, addr, value_type); | |
1194 | |
1195 // field index | |
1196 reference_info.field.index = field->field_index(); | |
1197 | |
1198 // invoke the callback | |
1199 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
1200 &reference_info, | |
1201 wrapper->klass_tag(), | |
1202 wrapper->obj_tag_p(), | |
1203 value, | |
1204 value_type, | |
1205 user_data); | |
1206 if (res & JVMTI_VISIT_ABORT) { | |
1207 return res; | |
1208 } | |
1209 } | |
1210 return 0; | |
1211 } | |
1212 | |
1213 | |
1214 // VM operation to iterate over all objects in the heap (both reachable | |
1215 // and unreachable) | |
1216 class VM_HeapIterateOperation: public VM_Operation { | |
1217 private: | |
1218 ObjectClosure* _blk; | |
1219 public: | |
1220 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
1221 | |
1222 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
1223 void doit() { | |
1224 // allows class files maps to be cached during iteration | |
1225 ClassFieldMapCacheMark cm; | |
1226 | |
1227 // make sure that heap is parsable (fills TLABs with filler objects) | |
1228 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1229 | |
1230 // Verify heap before iteration - if the heap gets corrupted then | |
1231 // JVMTI's IterateOverHeap will crash. | |
1232 if (VerifyBeforeIteration) { | |
1233 Universe::verify(); | |
1234 } | |
1235 | |
1236 // do the iteration | |
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1237 // If this operation encounters a bad object when using CMS, |
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1238 // consider using safe_object_iterate() which avoids perm gen |
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1239 // objects that may contain bad references. |
0 | 1240 Universe::heap()->object_iterate(_blk); |
1241 } | |
1242 | |
1243 }; | |
1244 | |
1245 | |
1246 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
1247 // IterateOverInstancesOfClass functions | |
1248 class IterateOverHeapObjectClosure: public ObjectClosure { | |
1249 private: | |
1250 JvmtiTagMap* _tag_map; | |
1251 KlassHandle _klass; | |
1252 jvmtiHeapObjectFilter _object_filter; | |
1253 jvmtiHeapObjectCallback _heap_object_callback; | |
1254 const void* _user_data; | |
1255 | |
1256 // accessors | |
1257 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1258 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
1259 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
1260 KlassHandle klass() const { return _klass; } | |
1261 const void* user_data() const { return _user_data; } | |
1262 | |
1263 // indicates if iteration has been aborted | |
1264 bool _iteration_aborted; | |
1265 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1266 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
1267 | |
1268 public: | |
1269 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
1270 KlassHandle klass, | |
1271 jvmtiHeapObjectFilter object_filter, | |
1272 jvmtiHeapObjectCallback heap_object_callback, | |
1273 const void* user_data) : | |
1274 _tag_map(tag_map), | |
1275 _klass(klass), | |
1276 _object_filter(object_filter), | |
1277 _heap_object_callback(heap_object_callback), | |
1278 _user_data(user_data), | |
1279 _iteration_aborted(false) | |
1280 { | |
1281 } | |
1282 | |
1283 void do_object(oop o); | |
1284 }; | |
1285 | |
1286 // invoked for each object in the heap | |
1287 void IterateOverHeapObjectClosure::do_object(oop o) { | |
1288 // check if iteration has been halted | |
1289 if (is_iteration_aborted()) return; | |
1290 | |
1291 // ignore any objects that aren't visible to profiler | |
1292 if (!ServiceUtil::visible_oop(o)) return; | |
1293 | |
1294 // instanceof check when filtering by klass | |
1295 if (!klass().is_null() && !o->is_a(klass()())) { | |
1296 return; | |
1297 } | |
1298 // prepare for the calllback | |
1299 CallbackWrapper wrapper(tag_map(), o); | |
1300 | |
1301 // if the object is tagged and we're only interested in untagged objects | |
1302 // then don't invoke the callback. Similiarly, if the object is untagged | |
1303 // and we're only interested in tagged objects we skip the callback. | |
1304 if (wrapper.obj_tag() != 0) { | |
1305 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
1306 } else { | |
1307 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
1308 } | |
1309 | |
1310 // invoke the agent's callback | |
1311 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
1312 wrapper.obj_size(), | |
1313 wrapper.obj_tag_p(), | |
1314 (void*)user_data()); | |
1315 if (control == JVMTI_ITERATION_ABORT) { | |
1316 set_iteration_aborted(true); | |
1317 } | |
1318 } | |
1319 | |
1320 // An ObjectClosure used to support the IterateThroughHeap function | |
1321 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
1322 private: | |
1323 JvmtiTagMap* _tag_map; | |
1324 KlassHandle _klass; | |
1325 int _heap_filter; | |
1326 const jvmtiHeapCallbacks* _callbacks; | |
1327 const void* _user_data; | |
1328 | |
1329 // accessor functions | |
1330 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1331 int heap_filter() const { return _heap_filter; } | |
1332 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
1333 KlassHandle klass() const { return _klass; } | |
1334 const void* user_data() const { return _user_data; } | |
1335 | |
1336 // indicates if the iteration has been aborted | |
1337 bool _iteration_aborted; | |
1338 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1339 | |
1340 // used to check the visit control flags. If the abort flag is set | |
1341 // then we set the iteration aborted flag so that the iteration completes | |
1342 // without processing any further objects | |
1343 bool check_flags_for_abort(jint flags) { | |
1344 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
1345 if (is_abort) { | |
1346 _iteration_aborted = true; | |
1347 } | |
1348 return is_abort; | |
1349 } | |
1350 | |
1351 public: | |
1352 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
1353 KlassHandle klass, | |
1354 int heap_filter, | |
1355 const jvmtiHeapCallbacks* heap_callbacks, | |
1356 const void* user_data) : | |
1357 _tag_map(tag_map), | |
1358 _klass(klass), | |
1359 _heap_filter(heap_filter), | |
1360 _callbacks(heap_callbacks), | |
1361 _user_data(user_data), | |
1362 _iteration_aborted(false) | |
1363 { | |
1364 } | |
1365 | |
1366 void do_object(oop o); | |
1367 }; | |
1368 | |
1369 // invoked for each object in the heap | |
1370 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
1371 // check if iteration has been halted | |
1372 if (is_iteration_aborted()) return; | |
1373 | |
1374 // ignore any objects that aren't visible to profiler | |
1375 if (!ServiceUtil::visible_oop(obj)) return; | |
1376 | |
1377 // apply class filter | |
1378 if (is_filtered_by_klass_filter(obj, klass())) return; | |
1379 | |
1380 // prepare for callback | |
1381 CallbackWrapper wrapper(tag_map(), obj); | |
1382 | |
1383 // check if filtered by the heap filter | |
1384 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
1385 return; | |
1386 } | |
1387 | |
1388 // for arrays we need the length, otherwise -1 | |
1389 bool is_array = obj->is_array(); | |
1390 int len = is_array ? arrayOop(obj)->length() : -1; | |
1391 | |
1392 // invoke the object callback (if callback is provided) | |
1393 if (callbacks()->heap_iteration_callback != NULL) { | |
1394 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
1395 jint res = (*cb)(wrapper.klass_tag(), | |
1396 wrapper.obj_size(), | |
1397 wrapper.obj_tag_p(), | |
1398 (jint)len, | |
1399 (void*)user_data()); | |
1400 if (check_flags_for_abort(res)) return; | |
1401 } | |
1402 | |
1403 // for objects and classes we report primitive fields if callback provided | |
1404 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
1405 jint res; | |
1406 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
1142 | 1407 if (obj->klass() == SystemDictionary::Class_klass()) { |
0 | 1408 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
1409 obj, | |
1410 cb, | |
1411 (void*)user_data()); | |
1412 } else { | |
1413 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
1414 obj, | |
1415 cb, | |
1416 (void*)user_data()); | |
1417 } | |
1418 if (check_flags_for_abort(res)) return; | |
1419 } | |
1420 | |
1421 // string callback | |
1422 if (!is_array && | |
1423 callbacks()->string_primitive_value_callback != NULL && | |
1142 | 1424 obj->klass() == SystemDictionary::String_klass()) { |
0 | 1425 jint res = invoke_string_value_callback( |
1426 callbacks()->string_primitive_value_callback, | |
1427 &wrapper, | |
1428 obj, | |
1429 (void*)user_data() ); | |
1430 if (check_flags_for_abort(res)) return; | |
1431 } | |
1432 | |
1433 // array callback | |
1434 if (is_array && | |
1435 callbacks()->array_primitive_value_callback != NULL && | |
1436 obj->is_typeArray()) { | |
1437 jint res = invoke_array_primitive_value_callback( | |
1438 callbacks()->array_primitive_value_callback, | |
1439 &wrapper, | |
1440 obj, | |
1441 (void*)user_data() ); | |
1442 if (check_flags_for_abort(res)) return; | |
1443 } | |
1444 }; | |
1445 | |
1446 | |
1447 // Deprecated function to iterate over all objects in the heap | |
1448 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
1449 KlassHandle klass, | |
1450 jvmtiHeapObjectCallback heap_object_callback, | |
1451 const void* user_data) | |
1452 { | |
1453 MutexLocker ml(Heap_lock); | |
1454 IterateOverHeapObjectClosure blk(this, | |
1455 klass, | |
1456 object_filter, | |
1457 heap_object_callback, | |
1458 user_data); | |
1459 VM_HeapIterateOperation op(&blk); | |
1460 VMThread::execute(&op); | |
1461 } | |
1462 | |
1463 | |
1464 // Iterates over all objects in the heap | |
1465 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
1466 KlassHandle klass, | |
1467 const jvmtiHeapCallbacks* callbacks, | |
1468 const void* user_data) | |
1469 { | |
1470 MutexLocker ml(Heap_lock); | |
1471 IterateThroughHeapObjectClosure blk(this, | |
1472 klass, | |
1473 heap_filter, | |
1474 callbacks, | |
1475 user_data); | |
1476 VM_HeapIterateOperation op(&blk); | |
1477 VMThread::execute(&op); | |
1478 } | |
1479 | |
1480 // support class for get_objects_with_tags | |
1481 | |
1482 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
1483 private: | |
1484 JvmtiEnv* _env; | |
1485 jlong* _tags; | |
1486 jint _tag_count; | |
1487 | |
1488 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
1489 GrowableArray<uint64_t>* _tag_results; // collected tags | |
1490 | |
1491 public: | |
1492 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
1493 _env = env; | |
1494 _tags = (jlong*)tags; | |
1495 _tag_count = tag_count; | |
6197 | 1496 _object_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jobject>(1,true); |
1497 _tag_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<uint64_t>(1,true); | |
0 | 1498 } |
1499 | |
1500 ~TagObjectCollector() { | |
1501 delete _object_results; | |
1502 delete _tag_results; | |
1503 } | |
1504 | |
1505 // for each tagged object check if the tag value matches | |
1506 // - if it matches then we create a JNI local reference to the object | |
1507 // and record the reference and tag value. | |
1508 // | |
1509 void do_entry(JvmtiTagHashmapEntry* entry) { | |
1510 for (int i=0; i<_tag_count; i++) { | |
1511 if (_tags[i] == entry->tag()) { | |
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1512 oop o = entry->object(); |
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1513 assert(o != NULL && Universe::heap()->is_in_reserved(o), "sanity check"); |
0 | 1514 jobject ref = JNIHandles::make_local(JavaThread::current(), o); |
1515 _object_results->append(ref); | |
1516 _tag_results->append((uint64_t)entry->tag()); | |
1517 } | |
1518 } | |
1519 } | |
1520 | |
1521 // return the results from the collection | |
1522 // | |
1523 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1524 jvmtiError error; | |
1525 int count = _object_results->length(); | |
1526 assert(count >= 0, "sanity check"); | |
1527 | |
1528 // if object_result_ptr is not NULL then allocate the result and copy | |
1529 // in the object references. | |
1530 if (object_result_ptr != NULL) { | |
1531 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
1532 if (error != JVMTI_ERROR_NONE) { | |
1533 return error; | |
1534 } | |
1535 for (int i=0; i<count; i++) { | |
1536 (*object_result_ptr)[i] = _object_results->at(i); | |
1537 } | |
1538 } | |
1539 | |
1540 // if tag_result_ptr is not NULL then allocate the result and copy | |
1541 // in the tag values. | |
1542 if (tag_result_ptr != NULL) { | |
1543 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
1544 if (error != JVMTI_ERROR_NONE) { | |
1545 if (object_result_ptr != NULL) { | |
1546 _env->Deallocate((unsigned char*)object_result_ptr); | |
1547 } | |
1548 return error; | |
1549 } | |
1550 for (int i=0; i<count; i++) { | |
1551 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
1552 } | |
1553 } | |
1554 | |
1555 *count_ptr = count; | |
1556 return JVMTI_ERROR_NONE; | |
1557 } | |
1558 }; | |
1559 | |
1560 // return the list of objects with the specified tags | |
1561 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
1562 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1563 | |
1564 TagObjectCollector collector(env(), tags, count); | |
1565 { | |
1566 // iterate over all tagged objects | |
1567 MutexLocker ml(lock()); | |
1568 entry_iterate(&collector); | |
1569 } | |
1570 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
1571 } | |
1572 | |
1573 | |
1574 // ObjectMarker is used to support the marking objects when walking the | |
1575 // heap. | |
1576 // | |
1577 // This implementation uses the existing mark bits in an object for | |
1578 // marking. Objects that are marked must later have their headers restored. | |
1579 // As most objects are unlocked and don't have their identity hash computed | |
1580 // we don't have to save their headers. Instead we save the headers that | |
1581 // are "interesting". Later when the headers are restored this implementation | |
1582 // restores all headers to their initial value and then restores the few | |
1583 // objects that had interesting headers. | |
1584 // | |
1585 // Future work: This implementation currently uses growable arrays to save | |
1586 // the oop and header of interesting objects. As an optimization we could | |
1587 // use the same technique as the GC and make use of the unused area | |
1588 // between top() and end(). | |
1589 // | |
1590 | |
1591 // An ObjectClosure used to restore the mark bits of an object | |
1592 class RestoreMarksClosure : public ObjectClosure { | |
1593 public: | |
1594 void do_object(oop o) { | |
1595 if (o != NULL) { | |
1596 markOop mark = o->mark(); | |
1597 if (mark->is_marked()) { | |
1598 o->init_mark(); | |
1599 } | |
1600 } | |
1601 } | |
1602 }; | |
1603 | |
1604 // ObjectMarker provides the mark and visited functions | |
1605 class ObjectMarker : AllStatic { | |
1606 private: | |
1607 // saved headers | |
1608 static GrowableArray<oop>* _saved_oop_stack; | |
1609 static GrowableArray<markOop>* _saved_mark_stack; | |
3815 | 1610 static bool _needs_reset; // do we need to reset mark bits? |
0 | 1611 |
1612 public: | |
1613 static void init(); // initialize | |
1614 static void done(); // clean-up | |
1615 | |
1616 static inline void mark(oop o); // mark an object | |
1617 static inline bool visited(oop o); // check if object has been visited | |
3815 | 1618 |
1619 static inline bool needs_reset() { return _needs_reset; } | |
1620 static inline void set_needs_reset(bool v) { _needs_reset = v; } | |
0 | 1621 }; |
1622 | |
1623 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
1624 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
3815 | 1625 bool ObjectMarker::_needs_reset = true; // need to reset mark bits by default |
0 | 1626 |
1627 // initialize ObjectMarker - prepares for object marking | |
1628 void ObjectMarker::init() { | |
1629 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
1630 | |
1631 // prepare heap for iteration | |
1632 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1633 | |
1634 // create stacks for interesting headers | |
6197 | 1635 _saved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markOop>(4000, true); |
1636 _saved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(4000, true); | |
0 | 1637 |
1638 if (UseBiasedLocking) { | |
1639 BiasedLocking::preserve_marks(); | |
1640 } | |
1641 } | |
1642 | |
1643 // Object marking is done so restore object headers | |
1644 void ObjectMarker::done() { | |
1645 // iterate over all objects and restore the mark bits to | |
1646 // their initial value | |
1647 RestoreMarksClosure blk; | |
3815 | 1648 if (needs_reset()) { |
1649 Universe::heap()->object_iterate(&blk); | |
1650 } else { | |
1651 // We don't need to reset mark bits on this call, but reset the | |
1652 // flag to the default for the next call. | |
1653 set_needs_reset(true); | |
1654 } | |
0 | 1655 |
1656 // now restore the interesting headers | |
1657 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
1658 oop o = _saved_oop_stack->at(i); | |
1659 markOop mark = _saved_mark_stack->at(i); | |
1660 o->set_mark(mark); | |
1661 } | |
1662 | |
1663 if (UseBiasedLocking) { | |
1664 BiasedLocking::restore_marks(); | |
1665 } | |
1666 | |
1667 // free the stacks | |
1668 delete _saved_oop_stack; | |
1669 delete _saved_mark_stack; | |
1670 } | |
1671 | |
1672 // mark an object | |
1673 inline void ObjectMarker::mark(oop o) { | |
1674 assert(Universe::heap()->is_in(o), "sanity check"); | |
1675 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
1676 | |
1677 // object's mark word | |
1678 markOop mark = o->mark(); | |
1679 | |
1680 if (mark->must_be_preserved(o)) { | |
1681 _saved_mark_stack->push(mark); | |
1682 _saved_oop_stack->push(o); | |
1683 } | |
1684 | |
1685 // mark the object | |
1686 o->set_mark(markOopDesc::prototype()->set_marked()); | |
1687 } | |
1688 | |
1689 // return true if object is marked | |
1690 inline bool ObjectMarker::visited(oop o) { | |
1691 return o->mark()->is_marked(); | |
1692 } | |
1693 | |
1694 // Stack allocated class to help ensure that ObjectMarker is used | |
1695 // correctly. Constructor initializes ObjectMarker, destructor calls | |
1696 // ObjectMarker's done() function to restore object headers. | |
1697 class ObjectMarkerController : public StackObj { | |
1698 public: | |
1699 ObjectMarkerController() { | |
1700 ObjectMarker::init(); | |
1701 } | |
1702 ~ObjectMarkerController() { | |
1703 ObjectMarker::done(); | |
1704 } | |
1705 }; | |
1706 | |
1707 | |
1708 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
1709 // (not performance critical as only used for roots) | |
1710 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
1711 switch (kind) { | |
1712 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
1713 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
1714 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
1715 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
1716 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
1717 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
1718 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
1719 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
1720 } | |
1721 } | |
1722 | |
1723 // Base class for all heap walk contexts. The base class maintains a flag | |
1724 // to indicate if the context is valid or not. | |
1725 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
1726 private: | |
1727 bool _valid; | |
1728 public: | |
1729 HeapWalkContext(bool valid) { _valid = valid; } | |
1730 void invalidate() { _valid = false; } | |
1731 bool is_valid() const { return _valid; } | |
1732 }; | |
1733 | |
1734 // A basic heap walk context for the deprecated heap walking functions. | |
1735 // The context for a basic heap walk are the callbacks and fields used by | |
1736 // the referrer caching scheme. | |
1737 class BasicHeapWalkContext: public HeapWalkContext { | |
1738 private: | |
1739 jvmtiHeapRootCallback _heap_root_callback; | |
1740 jvmtiStackReferenceCallback _stack_ref_callback; | |
1741 jvmtiObjectReferenceCallback _object_ref_callback; | |
1742 | |
1743 // used for caching | |
1744 oop _last_referrer; | |
1745 jlong _last_referrer_tag; | |
1746 | |
1747 public: | |
1748 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
1749 | |
1750 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
1751 jvmtiStackReferenceCallback stack_ref_callback, | |
1752 jvmtiObjectReferenceCallback object_ref_callback) : | |
1753 HeapWalkContext(true), | |
1754 _heap_root_callback(heap_root_callback), | |
1755 _stack_ref_callback(stack_ref_callback), | |
1756 _object_ref_callback(object_ref_callback), | |
1757 _last_referrer(NULL), | |
1758 _last_referrer_tag(0) { | |
1759 } | |
1760 | |
1761 // accessors | |
1762 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
1763 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
1764 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
1765 | |
1766 oop last_referrer() const { return _last_referrer; } | |
1767 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
1768 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
1769 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
1770 }; | |
1771 | |
1772 // The advanced heap walk context for the FollowReferences functions. | |
1773 // The context is the callbacks, and the fields used for filtering. | |
1774 class AdvancedHeapWalkContext: public HeapWalkContext { | |
1775 private: | |
1776 jint _heap_filter; | |
1777 KlassHandle _klass_filter; | |
1778 const jvmtiHeapCallbacks* _heap_callbacks; | |
1779 | |
1780 public: | |
1781 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
1782 | |
1783 AdvancedHeapWalkContext(jint heap_filter, | |
1784 KlassHandle klass_filter, | |
1785 const jvmtiHeapCallbacks* heap_callbacks) : | |
1786 HeapWalkContext(true), | |
1787 _heap_filter(heap_filter), | |
1788 _klass_filter(klass_filter), | |
1789 _heap_callbacks(heap_callbacks) { | |
1790 } | |
1791 | |
1792 // accessors | |
1793 jint heap_filter() const { return _heap_filter; } | |
1794 KlassHandle klass_filter() const { return _klass_filter; } | |
1795 | |
1796 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
1797 return _heap_callbacks->heap_reference_callback; | |
1798 }; | |
1799 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
1800 return _heap_callbacks->primitive_field_callback; | |
1801 } | |
1802 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
1803 return _heap_callbacks->array_primitive_value_callback; | |
1804 } | |
1805 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
1806 return _heap_callbacks->string_primitive_value_callback; | |
1807 } | |
1808 }; | |
1809 | |
1810 // The CallbackInvoker is a class with static functions that the heap walk can call | |
1811 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
1812 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
1813 // mode is for the newer FollowReferences function which supports a lot of | |
1814 // additional callbacks. | |
1815 class CallbackInvoker : AllStatic { | |
1816 private: | |
1817 // heap walk styles | |
1818 enum { basic, advanced }; | |
1819 static int _heap_walk_type; | |
1820 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
1821 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
1822 | |
1823 // context for basic style heap walk | |
1824 static BasicHeapWalkContext _basic_context; | |
1825 static BasicHeapWalkContext* basic_context() { | |
1826 assert(_basic_context.is_valid(), "invalid"); | |
1827 return &_basic_context; | |
1828 } | |
1829 | |
1830 // context for advanced style heap walk | |
1831 static AdvancedHeapWalkContext _advanced_context; | |
1832 static AdvancedHeapWalkContext* advanced_context() { | |
1833 assert(_advanced_context.is_valid(), "invalid"); | |
1834 return &_advanced_context; | |
1835 } | |
1836 | |
1837 // context needed for all heap walks | |
1838 static JvmtiTagMap* _tag_map; | |
1839 static const void* _user_data; | |
1840 static GrowableArray<oop>* _visit_stack; | |
1841 | |
1842 // accessors | |
1843 static JvmtiTagMap* tag_map() { return _tag_map; } | |
1844 static const void* user_data() { return _user_data; } | |
1845 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
1846 | |
1847 // if the object hasn't been visited then push it onto the visit stack | |
1848 // so that it will be visited later | |
1849 static inline bool check_for_visit(oop obj) { | |
1850 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
1851 return true; | |
1852 } | |
1853 | |
1854 // invoke basic style callbacks | |
1855 static inline bool invoke_basic_heap_root_callback | |
1856 (jvmtiHeapRootKind root_kind, oop obj); | |
1857 static inline bool invoke_basic_stack_ref_callback | |
1858 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
1859 int slot, oop obj); | |
1860 static inline bool invoke_basic_object_reference_callback | |
1861 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1862 | |
1863 // invoke advanced style callbacks | |
1864 static inline bool invoke_advanced_heap_root_callback | |
1865 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
1866 static inline bool invoke_advanced_stack_ref_callback | |
1867 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
1868 jmethodID method, jlocation bci, jint slot, oop obj); | |
1869 static inline bool invoke_advanced_object_reference_callback | |
1870 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1871 | |
1872 // used to report the value of primitive fields | |
1873 static inline bool report_primitive_field | |
1874 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
1875 | |
1876 public: | |
1877 // initialize for basic mode | |
1878 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1879 GrowableArray<oop>* visit_stack, | |
1880 const void* user_data, | |
1881 BasicHeapWalkContext context); | |
1882 | |
1883 // initialize for advanced mode | |
1884 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1885 GrowableArray<oop>* visit_stack, | |
1886 const void* user_data, | |
1887 AdvancedHeapWalkContext context); | |
1888 | |
1889 // functions to report roots | |
1890 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
1891 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
1892 jmethodID m, oop o); | |
1893 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
1894 jmethodID method, jlocation bci, jint slot, oop o); | |
1895 | |
1896 // functions to report references | |
1897 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
1898 static inline bool report_class_reference(oop referrer, oop referree); | |
1899 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
1900 static inline bool report_signers_reference(oop referrer, oop referree); | |
1901 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
1902 static inline bool report_superclass_reference(oop referrer, oop referree); | |
1903 static inline bool report_interface_reference(oop referrer, oop referree); | |
1904 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
1905 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
1906 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
1907 static inline bool report_primitive_array_values(oop array); | |
1908 static inline bool report_string_value(oop str); | |
1909 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
1910 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
1911 }; | |
1912 | |
1913 // statics | |
1914 int CallbackInvoker::_heap_walk_type; | |
1915 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
1916 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
1917 JvmtiTagMap* CallbackInvoker::_tag_map; | |
1918 const void* CallbackInvoker::_user_data; | |
1919 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
1920 | |
1921 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
1922 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1923 GrowableArray<oop>* visit_stack, | |
1924 const void* user_data, | |
1925 BasicHeapWalkContext context) { | |
1926 _tag_map = tag_map; | |
1927 _visit_stack = visit_stack; | |
1928 _user_data = user_data; | |
1929 _basic_context = context; | |
1930 _advanced_context.invalidate(); // will trigger assertion if used | |
1931 _heap_walk_type = basic; | |
1932 } | |
1933 | |
1934 // initialize for advanced heap walk (FollowReferences) | |
1935 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1936 GrowableArray<oop>* visit_stack, | |
1937 const void* user_data, | |
1938 AdvancedHeapWalkContext context) { | |
1939 _tag_map = tag_map; | |
1940 _visit_stack = visit_stack; | |
1941 _user_data = user_data; | |
1942 _advanced_context = context; | |
1943 _basic_context.invalidate(); // will trigger assertion if used | |
1944 _heap_walk_type = advanced; | |
1945 } | |
1946 | |
1947 | |
1948 // invoke basic style heap root callback | |
1949 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
1950 assert(ServiceUtil::visible_oop(obj), "checking"); | |
1951 | |
1952 // if we heap roots should be reported | |
1953 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
1954 if (cb == NULL) { | |
1955 return check_for_visit(obj); | |
1956 } | |
1957 | |
1958 CallbackWrapper wrapper(tag_map(), obj); | |
1959 jvmtiIterationControl control = (*cb)(root_kind, | |
1960 wrapper.klass_tag(), | |
1961 wrapper.obj_size(), | |
1962 wrapper.obj_tag_p(), | |
1963 (void*)user_data()); | |
1964 // push root to visit stack when following references | |
1965 if (control == JVMTI_ITERATION_CONTINUE && | |
1966 basic_context()->object_ref_callback() != NULL) { | |
1967 visit_stack()->push(obj); | |
1968 } | |
1969 return control != JVMTI_ITERATION_ABORT; | |
1970 } | |
1971 | |
1972 // invoke basic style stack ref callback | |
1973 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
1974 jlong thread_tag, | |
1975 jint depth, | |
1976 jmethodID method, | |
1977 jint slot, | |
1978 oop obj) { | |
1979 assert(ServiceUtil::visible_oop(obj), "checking"); | |
1980 | |
1981 // if we stack refs should be reported | |
1982 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
1983 if (cb == NULL) { | |
1984 return check_for_visit(obj); | |
1985 } | |
1986 | |
1987 CallbackWrapper wrapper(tag_map(), obj); | |
1988 jvmtiIterationControl control = (*cb)(root_kind, | |
1989 wrapper.klass_tag(), | |
1990 wrapper.obj_size(), | |
1991 wrapper.obj_tag_p(), | |
1992 thread_tag, | |
1993 depth, | |
1994 method, | |
1995 slot, | |
1996 (void*)user_data()); | |
1997 // push root to visit stack when following references | |
1998 if (control == JVMTI_ITERATION_CONTINUE && | |
1999 basic_context()->object_ref_callback() != NULL) { | |
2000 visit_stack()->push(obj); | |
2001 } | |
2002 return control != JVMTI_ITERATION_ABORT; | |
2003 } | |
2004 | |
2005 // invoke basic style object reference callback | |
2006 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
2007 oop referrer, | |
2008 oop referree, | |
2009 jint index) { | |
2010 | |
2011 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2012 assert(ServiceUtil::visible_oop(referree), "checking"); | |
2013 | |
2014 BasicHeapWalkContext* context = basic_context(); | |
2015 | |
2016 // callback requires the referrer's tag. If it's the same referrer | |
2017 // as the last call then we use the cached value. | |
2018 jlong referrer_tag; | |
2019 if (referrer == context->last_referrer()) { | |
2020 referrer_tag = context->last_referrer_tag(); | |
2021 } else { | |
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2022 referrer_tag = tag_for(tag_map(), referrer); |
0 | 2023 } |
2024 | |
2025 // do the callback | |
2026 CallbackWrapper wrapper(tag_map(), referree); | |
2027 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
2028 jvmtiIterationControl control = (*cb)(ref_kind, | |
2029 wrapper.klass_tag(), | |
2030 wrapper.obj_size(), | |
2031 wrapper.obj_tag_p(), | |
2032 referrer_tag, | |
2033 index, | |
2034 (void*)user_data()); | |
2035 | |
2036 // record referrer and referrer tag. For self-references record the | |
2037 // tag value from the callback as this might differ from referrer_tag. | |
2038 context->set_last_referrer(referrer); | |
2039 if (referrer == referree) { | |
2040 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
2041 } else { | |
2042 context->set_last_referrer_tag(referrer_tag); | |
2043 } | |
2044 | |
2045 if (control == JVMTI_ITERATION_CONTINUE) { | |
2046 return check_for_visit(referree); | |
2047 } else { | |
2048 return control != JVMTI_ITERATION_ABORT; | |
2049 } | |
2050 } | |
2051 | |
2052 // invoke advanced style heap root callback | |
2053 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
2054 oop obj) { | |
2055 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2056 | |
2057 AdvancedHeapWalkContext* context = advanced_context(); | |
2058 | |
2059 // check that callback is provided | |
2060 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2061 if (cb == NULL) { | |
2062 return check_for_visit(obj); | |
2063 } | |
2064 | |
2065 // apply class filter | |
2066 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2067 return check_for_visit(obj); | |
2068 } | |
2069 | |
2070 // setup the callback wrapper | |
2071 CallbackWrapper wrapper(tag_map(), obj); | |
2072 | |
2073 // apply tag filter | |
2074 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2075 wrapper.klass_tag(), | |
2076 context->heap_filter())) { | |
2077 return check_for_visit(obj); | |
2078 } | |
2079 | |
2080 // for arrays we need the length, otherwise -1 | |
2081 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2082 | |
2083 // invoke the callback | |
2084 jint res = (*cb)(ref_kind, | |
2085 NULL, // referrer info | |
2086 wrapper.klass_tag(), | |
2087 0, // referrer_class_tag is 0 for heap root | |
2088 wrapper.obj_size(), | |
2089 wrapper.obj_tag_p(), | |
2090 NULL, // referrer_tag_p | |
2091 len, | |
2092 (void*)user_data()); | |
2093 if (res & JVMTI_VISIT_ABORT) { | |
2094 return false;// referrer class tag | |
2095 } | |
2096 if (res & JVMTI_VISIT_OBJECTS) { | |
2097 check_for_visit(obj); | |
2098 } | |
2099 return true; | |
2100 } | |
2101 | |
2102 // report a reference from a thread stack to an object | |
2103 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
2104 jlong thread_tag, | |
2105 jlong tid, | |
2106 int depth, | |
2107 jmethodID method, | |
2108 jlocation bci, | |
2109 jint slot, | |
2110 oop obj) { | |
2111 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2112 | |
2113 AdvancedHeapWalkContext* context = advanced_context(); | |
2114 | |
2115 // check that callback is provider | |
2116 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2117 if (cb == NULL) { | |
2118 return check_for_visit(obj); | |
2119 } | |
2120 | |
2121 // apply class filter | |
2122 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2123 return check_for_visit(obj); | |
2124 } | |
2125 | |
2126 // setup the callback wrapper | |
2127 CallbackWrapper wrapper(tag_map(), obj); | |
2128 | |
2129 // apply tag filter | |
2130 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2131 wrapper.klass_tag(), | |
2132 context->heap_filter())) { | |
2133 return check_for_visit(obj); | |
2134 } | |
2135 | |
2136 // setup the referrer info | |
2137 jvmtiHeapReferenceInfo reference_info; | |
2138 reference_info.stack_local.thread_tag = thread_tag; | |
2139 reference_info.stack_local.thread_id = tid; | |
2140 reference_info.stack_local.depth = depth; | |
2141 reference_info.stack_local.method = method; | |
2142 reference_info.stack_local.location = bci; | |
2143 reference_info.stack_local.slot = slot; | |
2144 | |
2145 // for arrays we need the length, otherwise -1 | |
2146 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2147 | |
2148 // call into the agent | |
2149 int res = (*cb)(ref_kind, | |
2150 &reference_info, | |
2151 wrapper.klass_tag(), | |
2152 0, // referrer_class_tag is 0 for heap root (stack) | |
2153 wrapper.obj_size(), | |
2154 wrapper.obj_tag_p(), | |
2155 NULL, // referrer_tag is 0 for root | |
2156 len, | |
2157 (void*)user_data()); | |
2158 | |
2159 if (res & JVMTI_VISIT_ABORT) { | |
2160 return false; | |
2161 } | |
2162 if (res & JVMTI_VISIT_OBJECTS) { | |
2163 check_for_visit(obj); | |
2164 } | |
2165 return true; | |
2166 } | |
2167 | |
2168 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
2169 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
2170 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
2171 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
2172 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
2173 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
2174 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
2175 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
2176 | |
2177 // invoke the object reference callback to report a reference | |
2178 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
2179 oop referrer, | |
2180 oop obj, | |
2181 jint index) | |
2182 { | |
2183 // field index is only valid field in reference_info | |
2184 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2185 | |
2186 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2187 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2188 | |
2189 AdvancedHeapWalkContext* context = advanced_context(); | |
2190 | |
2191 // check that callback is provider | |
2192 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2193 if (cb == NULL) { | |
2194 return check_for_visit(obj); | |
2195 } | |
2196 | |
2197 // apply class filter | |
2198 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2199 return check_for_visit(obj); | |
2200 } | |
2201 | |
2202 // setup the callback wrapper | |
2203 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
2204 | |
2205 // apply tag filter | |
2206 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2207 wrapper.klass_tag(), | |
2208 context->heap_filter())) { | |
2209 return check_for_visit(obj); | |
2210 } | |
2211 | |
2212 // field index is only valid field in reference_info | |
2213 reference_info.field.index = index; | |
2214 | |
2215 // for arrays we need the length, otherwise -1 | |
2216 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2217 | |
2218 // invoke the callback | |
2219 int res = (*cb)(ref_kind, | |
2220 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
2221 wrapper.klass_tag(), | |
2222 wrapper.referrer_klass_tag(), | |
2223 wrapper.obj_size(), | |
2224 wrapper.obj_tag_p(), | |
2225 wrapper.referrer_tag_p(), | |
2226 len, | |
2227 (void*)user_data()); | |
2228 | |
2229 if (res & JVMTI_VISIT_ABORT) { | |
2230 return false; | |
2231 } | |
2232 if (res & JVMTI_VISIT_OBJECTS) { | |
2233 check_for_visit(obj); | |
2234 } | |
2235 return true; | |
2236 } | |
2237 | |
2238 // report a "simple root" | |
2239 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
2240 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
2241 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
2242 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2243 | |
2244 if (is_basic_heap_walk()) { | |
2245 // map to old style root kind | |
2246 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
2247 return invoke_basic_heap_root_callback(root_kind, obj); | |
2248 } else { | |
2249 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
2250 return invoke_advanced_heap_root_callback(kind, obj); | |
2251 } | |
2252 } | |
2253 | |
2254 | |
2255 // invoke the primitive array values | |
2256 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
2257 assert(obj->is_typeArray(), "not a primitive array"); | |
2258 | |
2259 AdvancedHeapWalkContext* context = advanced_context(); | |
2260 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
2261 | |
2262 // apply class filter | |
2263 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2264 return true; | |
2265 } | |
2266 | |
2267 CallbackWrapper wrapper(tag_map(), obj); | |
2268 | |
2269 // apply tag filter | |
2270 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2271 wrapper.klass_tag(), | |
2272 context->heap_filter())) { | |
2273 return true; | |
2274 } | |
2275 | |
2276 // invoke the callback | |
2277 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
2278 &wrapper, | |
2279 obj, | |
2280 (void*)user_data()); | |
2281 return (!(res & JVMTI_VISIT_ABORT)); | |
2282 } | |
2283 | |
2284 // invoke the string value callback | |
2285 inline bool CallbackInvoker::report_string_value(oop str) { | |
1142 | 2286 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 2287 |
2288 AdvancedHeapWalkContext* context = advanced_context(); | |
2289 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
2290 | |
2291 // apply class filter | |
2292 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
2293 return true; | |
2294 } | |
2295 | |
2296 CallbackWrapper wrapper(tag_map(), str); | |
2297 | |
2298 // apply tag filter | |
2299 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2300 wrapper.klass_tag(), | |
2301 context->heap_filter())) { | |
2302 return true; | |
2303 } | |
2304 | |
2305 // invoke the callback | |
2306 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
2307 &wrapper, | |
2308 str, | |
2309 (void*)user_data()); | |
2310 return (!(res & JVMTI_VISIT_ABORT)); | |
2311 } | |
2312 | |
2313 // invoke the primitive field callback | |
2314 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
2315 oop obj, | |
2316 jint index, | |
2317 address addr, | |
2318 char type) | |
2319 { | |
2320 // for primitive fields only the index will be set | |
2321 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2322 | |
2323 AdvancedHeapWalkContext* context = advanced_context(); | |
2324 assert(context->primitive_field_callback() != NULL, "no callback"); | |
2325 | |
2326 // apply class filter | |
2327 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2328 return true; | |
2329 } | |
2330 | |
2331 CallbackWrapper wrapper(tag_map(), obj); | |
2332 | |
2333 // apply tag filter | |
2334 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2335 wrapper.klass_tag(), | |
2336 context->heap_filter())) { | |
2337 return true; | |
2338 } | |
2339 | |
2340 // the field index in the referrer | |
2341 reference_info.field.index = index; | |
2342 | |
2343 // map the type | |
2344 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
2345 | |
2346 // setup the jvalue | |
2347 jvalue value; | |
2348 copy_to_jvalue(&value, addr, value_type); | |
2349 | |
2350 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
2351 int res = (*cb)(ref_kind, | |
2352 &reference_info, | |
2353 wrapper.klass_tag(), | |
2354 wrapper.obj_tag_p(), | |
2355 value, | |
2356 value_type, | |
2357 (void*)user_data()); | |
2358 return (!(res & JVMTI_VISIT_ABORT)); | |
2359 } | |
2360 | |
2361 | |
2362 // instance field | |
2363 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
2364 jint index, | |
2365 address value, | |
2366 char type) { | |
2367 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
2368 obj, | |
2369 index, | |
2370 value, | |
2371 type); | |
2372 } | |
2373 | |
2374 // static field | |
2375 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
2376 jint index, | |
2377 address value, | |
2378 char type) { | |
2379 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
2380 obj, | |
2381 index, | |
2382 value, | |
2383 type); | |
2384 } | |
2385 | |
2386 // report a JNI local (root object) to the profiler | |
2387 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
2388 if (is_basic_heap_walk()) { | |
2389 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
2390 thread_tag, | |
2391 depth, | |
2392 m, | |
2393 -1, | |
2394 obj); | |
2395 } else { | |
2396 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
2397 thread_tag, tid, | |
2398 depth, | |
2399 m, | |
2400 (jlocation)-1, | |
2401 -1, | |
2402 obj); | |
2403 } | |
2404 } | |
2405 | |
2406 | |
2407 // report a local (stack reference, root object) | |
2408 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
2409 jlong tid, | |
2410 jint depth, | |
2411 jmethodID method, | |
2412 jlocation bci, | |
2413 jint slot, | |
2414 oop obj) { | |
2415 if (is_basic_heap_walk()) { | |
2416 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
2417 thread_tag, | |
2418 depth, | |
2419 method, | |
2420 slot, | |
2421 obj); | |
2422 } else { | |
2423 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
2424 thread_tag, | |
2425 tid, | |
2426 depth, | |
2427 method, | |
2428 bci, | |
2429 slot, | |
2430 obj); | |
2431 } | |
2432 } | |
2433 | |
2434 // report an object referencing a class. | |
2435 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
2436 if (is_basic_heap_walk()) { | |
2437 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2438 } else { | |
2439 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
2440 } | |
2441 } | |
2442 | |
2443 // report a class referencing its class loader. | |
2444 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
2445 if (is_basic_heap_walk()) { | |
2446 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2447 } else { | |
2448 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2449 } | |
2450 } | |
2451 | |
2452 // report a class referencing its signers. | |
2453 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
2454 if (is_basic_heap_walk()) { | |
2455 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
2456 } else { | |
2457 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
2458 } | |
2459 } | |
2460 | |
2461 // report a class referencing its protection domain.. | |
2462 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
2463 if (is_basic_heap_walk()) { | |
2464 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2465 } else { | |
2466 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2467 } | |
2468 } | |
2469 | |
2470 // report a class referencing its superclass. | |
2471 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
2472 if (is_basic_heap_walk()) { | |
2473 // Send this to be consistent with past implementation | |
2474 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2475 } else { | |
2476 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); | |
2477 } | |
2478 } | |
2479 | |
2480 // report a class referencing one of its interfaces. | |
2481 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
2482 if (is_basic_heap_walk()) { | |
2483 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
2484 } else { | |
2485 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
2486 } | |
2487 } | |
2488 | |
2489 // report a class referencing one of its static fields. | |
2490 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
2491 if (is_basic_heap_walk()) { | |
2492 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2493 } else { | |
2494 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2495 } | |
2496 } | |
2497 | |
2498 // report an array referencing an element object | |
2499 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
2500 if (is_basic_heap_walk()) { | |
2501 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2502 } else { | |
2503 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2504 } | |
2505 } | |
2506 | |
2507 // report an object referencing an instance field object | |
2508 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
2509 if (is_basic_heap_walk()) { | |
2510 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
2511 } else { | |
2512 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
2513 } | |
2514 } | |
2515 | |
2516 // report an array referencing an element object | |
2517 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
2518 if (is_basic_heap_walk()) { | |
2519 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2520 } else { | |
2521 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2522 } | |
2523 } | |
2524 | |
2525 // A supporting closure used to process simple roots | |
2526 class SimpleRootsClosure : public OopClosure { | |
2527 private: | |
2528 jvmtiHeapReferenceKind _kind; | |
2529 bool _continue; | |
2530 | |
2531 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
2532 | |
2533 public: | |
2534 void set_kind(jvmtiHeapReferenceKind kind) { | |
2535 _kind = kind; | |
2536 _continue = true; | |
2537 } | |
2538 | |
2539 inline bool stopped() { | |
2540 return !_continue; | |
2541 } | |
2542 | |
2543 void do_oop(oop* obj_p) { | |
2544 // iteration has terminated | |
2545 if (stopped()) { | |
2546 return; | |
2547 } | |
2548 | |
2549 // ignore null or deleted handles | |
2550 oop o = *obj_p; | |
2551 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2552 return; | |
2553 } | |
2554 | |
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2555 assert(Universe::heap()->is_in_reserved(o), "should be impossible"); |
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2556 |
0 | 2557 jvmtiHeapReferenceKind kind = root_kind(); |
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2558 if (kind == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { |
0 | 2559 // SystemDictionary::always_strong_oops_do reports the application |
2560 // class loader as a root. We want this root to be reported as | |
2561 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
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2562 if (!o->is_instanceMirror()) { |
0 | 2563 kind = JVMTI_HEAP_REFERENCE_OTHER; |
2564 } | |
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2565 } |
0 | 2566 |
2567 // some objects are ignored - in the case of simple | |
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2568 // roots it's mostly Symbol*s that we are skipping |
0 | 2569 // here. |
2570 if (!ServiceUtil::visible_oop(o)) { | |
2571 return; | |
2572 } | |
2573 | |
2574 // invoke the callback | |
2575 _continue = CallbackInvoker::report_simple_root(kind, o); | |
2576 | |
2577 } | |
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2578 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2579 }; |
2580 | |
2581 // A supporting closure used to process JNI locals | |
2582 class JNILocalRootsClosure : public OopClosure { | |
2583 private: | |
2584 jlong _thread_tag; | |
2585 jlong _tid; | |
2586 jint _depth; | |
2587 jmethodID _method; | |
2588 bool _continue; | |
2589 public: | |
2590 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
2591 _thread_tag = thread_tag; | |
2592 _tid = tid; | |
2593 _depth = depth; | |
2594 _method = method; | |
2595 _continue = true; | |
2596 } | |
2597 | |
2598 inline bool stopped() { | |
2599 return !_continue; | |
2600 } | |
2601 | |
2602 void do_oop(oop* obj_p) { | |
2603 // iteration has terminated | |
2604 if (stopped()) { | |
2605 return; | |
2606 } | |
2607 | |
2608 // ignore null or deleted handles | |
2609 oop o = *obj_p; | |
2610 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2611 return; | |
2612 } | |
2613 | |
2614 if (!ServiceUtil::visible_oop(o)) { | |
2615 return; | |
2616 } | |
2617 | |
2618 // invoke the callback | |
2619 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
2620 } | |
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2621 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2622 }; |
2623 | |
2624 | |
2625 // A VM operation to iterate over objects that are reachable from | |
2626 // a set of roots or an initial object. | |
2627 // | |
2628 // For VM_HeapWalkOperation the set of roots used is :- | |
2629 // | |
2630 // - All JNI global references | |
2631 // - All inflated monitors | |
2632 // - All classes loaded by the boot class loader (or all classes | |
2633 // in the event that class unloading is disabled) | |
2634 // - All java threads | |
2635 // - For each java thread then all locals and JNI local references | |
2636 // on the thread's execution stack | |
2637 // - All visible/explainable objects from Universes::oops_do | |
2638 // | |
2639 class VM_HeapWalkOperation: public VM_Operation { | |
2640 private: | |
2641 enum { | |
2642 initial_visit_stack_size = 4000 | |
2643 }; | |
2644 | |
2645 bool _is_advanced_heap_walk; // indicates FollowReferences | |
2646 JvmtiTagMap* _tag_map; | |
2647 Handle _initial_object; | |
2648 GrowableArray<oop>* _visit_stack; // the visit stack | |
2649 | |
2650 bool _collecting_heap_roots; // are we collecting roots | |
2651 bool _following_object_refs; // are we following object references | |
2652 | |
2653 bool _reporting_primitive_fields; // optional reporting | |
2654 bool _reporting_primitive_array_values; | |
2655 bool _reporting_string_values; | |
2656 | |
2657 GrowableArray<oop>* create_visit_stack() { | |
6197 | 2658 return new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(initial_visit_stack_size, true); |
0 | 2659 } |
2660 | |
2661 // accessors | |
2662 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
2663 JvmtiTagMap* tag_map() const { return _tag_map; } | |
2664 Handle initial_object() const { return _initial_object; } | |
2665 | |
2666 bool is_following_references() const { return _following_object_refs; } | |
2667 | |
2668 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
2669 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
2670 bool is_reporting_string_values() const { return _reporting_string_values; } | |
2671 | |
2672 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
2673 | |
2674 // iterate over the various object types | |
2675 inline bool iterate_over_array(oop o); | |
2676 inline bool iterate_over_type_array(oop o); | |
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2677 inline bool iterate_over_class(oop o); |
0 | 2678 inline bool iterate_over_object(oop o); |
2679 | |
2680 // root collection | |
2681 inline bool collect_simple_roots(); | |
2682 inline bool collect_stack_roots(); | |
2683 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
2684 | |
2685 // visit an object | |
2686 inline bool visit(oop o); | |
2687 | |
2688 public: | |
2689 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2690 Handle initial_object, | |
2691 BasicHeapWalkContext callbacks, | |
2692 const void* user_data); | |
2693 | |
2694 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2695 Handle initial_object, | |
2696 AdvancedHeapWalkContext callbacks, | |
2697 const void* user_data); | |
2698 | |
2699 ~VM_HeapWalkOperation(); | |
2700 | |
2701 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
2702 void doit(); | |
2703 }; | |
2704 | |
2705 | |
2706 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2707 Handle initial_object, | |
2708 BasicHeapWalkContext callbacks, | |
2709 const void* user_data) { | |
2710 _is_advanced_heap_walk = false; | |
2711 _tag_map = tag_map; | |
2712 _initial_object = initial_object; | |
2713 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
2714 _reporting_primitive_fields = false; | |
2715 _reporting_primitive_array_values = false; | |
2716 _reporting_string_values = false; | |
2717 _visit_stack = create_visit_stack(); | |
2718 | |
2719 | |
2720 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2721 } | |
2722 | |
2723 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2724 Handle initial_object, | |
2725 AdvancedHeapWalkContext callbacks, | |
2726 const void* user_data) { | |
2727 _is_advanced_heap_walk = true; | |
2728 _tag_map = tag_map; | |
2729 _initial_object = initial_object; | |
2730 _following_object_refs = true; | |
2731 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
2732 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
2733 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
2734 _visit_stack = create_visit_stack(); | |
2735 | |
2736 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2737 } | |
2738 | |
2739 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
2740 if (_following_object_refs) { | |
2741 assert(_visit_stack != NULL, "checking"); | |
2742 delete _visit_stack; | |
2743 _visit_stack = NULL; | |
2744 } | |
2745 } | |
2746 | |
2747 // an array references its class and has a reference to | |
2748 // each element in the array | |
2749 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
2750 objArrayOop array = objArrayOop(o); | |
2751 | |
2752 // array reference to its class | |
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2753 oop mirror = ObjArrayKlass::cast(array->klass())->java_mirror(); |
0 | 2754 if (!CallbackInvoker::report_class_reference(o, mirror)) { |
2755 return false; | |
2756 } | |
2757 | |
2758 // iterate over the array and report each reference to a | |
2759 // non-null element | |
2760 for (int index=0; index<array->length(); index++) { | |
2761 oop elem = array->obj_at(index); | |
2762 if (elem == NULL) { | |
2763 continue; | |
2764 } | |
2765 | |
2766 // report the array reference o[index] = elem | |
2767 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
2768 return false; | |
2769 } | |
2770 } | |
2771 return true; | |
2772 } | |
2773 | |
2774 // a type array references its class | |
2775 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
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2776 Klass* k = o->klass(); |
6983 | 2777 oop mirror = k->java_mirror(); |
0 | 2778 if (!CallbackInvoker::report_class_reference(o, mirror)) { |
2779 return false; | |
2780 } | |
2781 | |
2782 // report the array contents if required | |
2783 if (is_reporting_primitive_array_values()) { | |
2784 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
2785 return false; | |
2786 } | |
2787 } | |
2788 return true; | |
2789 } | |
2790 | |
2791 // verify that a static oop field is in range | |
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2792 static inline bool verify_static_oop(InstanceKlass* ik, |
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2793 oop mirror, int offset) { |
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2794 address obj_p = (address)mirror + offset; |
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2795 address start = (address)InstanceMirrorKlass::start_of_static_fields(mirror); |
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2796 address end = start + (java_lang_Class::static_oop_field_count(mirror) * heapOopSize); |
0 | 2797 assert(end >= start, "sanity check"); |
2798 | |
2799 if (obj_p >= start && obj_p < end) { | |
2800 return true; | |
2801 } else { | |
2802 return false; | |
2803 } | |
2804 } | |
2805 | |
2806 // a class references its super class, interfaces, class loader, ... | |
2807 // and finally its static fields | |
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2808 inline bool VM_HeapWalkOperation::iterate_over_class(oop java_class) { |
0 | 2809 int i; |
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2810 Klass* klass = java_lang_Class::as_Klass(java_class); |
0 | 2811 |
2812 if (klass->oop_is_instance()) { | |
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2813 InstanceKlass* ik = InstanceKlass::cast(klass); |
0 | 2814 |
2815 // ignore the class if it's has been initialized yet | |
2816 if (!ik->is_linked()) { | |
2817 return true; | |
2818 } | |
2819 | |
2820 // get the java mirror | |
2821 oop mirror = klass->java_mirror(); | |
2822 | |
2823 // super (only if something more interesting than java.lang.Object) | |
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2824 Klass* java_super = ik->java_super(); |
1142 | 2825 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
6983 | 2826 oop super = java_super->java_mirror(); |
0 | 2827 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { |
2828 return false; | |
2829 } | |
2830 } | |
2831 | |
2832 // class loader | |
2833 oop cl = ik->class_loader(); | |
2834 if (cl != NULL) { | |
2835 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
2836 return false; | |
2837 } | |
2838 } | |
2839 | |
2840 // protection domain | |
2841 oop pd = ik->protection_domain(); | |
2842 if (pd != NULL) { | |
2843 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
2844 return false; | |
2845 } | |
2846 } | |
2847 | |
2848 // signers | |
2849 oop signers = ik->signers(); | |
2850 if (signers != NULL) { | |
2851 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
2852 return false; | |
2853 } | |
2854 } | |
2855 | |
2856 // references from the constant pool | |
2857 { | |
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2858 ConstantPool* const pool = ik->constants(); |
0 | 2859 for (int i = 1; i < pool->length(); i++) { |
2860 constantTag tag = pool->tag_at(i).value(); | |
2861 if (tag.is_string() || tag.is_klass()) { | |
2862 oop entry; | |
2863 if (tag.is_string()) { | |
2864 entry = pool->resolved_string_at(i); | |
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2865 // If the entry is non-null it is resolved. |
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2866 if (entry == NULL) continue; |
0 | 2867 } else { |
6983 | 2868 entry = pool->resolved_klass_at(i)->java_mirror(); |
0 | 2869 } |
2870 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
2871 return false; | |
2872 } | |
2873 } | |
2874 } | |
2875 } | |
2876 | |
2877 // interfaces | |
2878 // (These will already have been reported as references from the constant pool | |
2879 // but are specified by IterateOverReachableObjects and must be reported). | |
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2880 Array<Klass*>* interfaces = ik->local_interfaces(); |
0 | 2881 for (i = 0; i < interfaces->length(); i++) { |
6983 | 2882 oop interf = ((Klass*)interfaces->at(i))->java_mirror(); |
0 | 2883 if (interf == NULL) { |
2884 continue; | |
2885 } | |
2886 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
2887 return false; | |
2888 } | |
2889 } | |
2890 | |
2891 // iterate over the static fields | |
2892 | |
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2893 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
0 | 2894 for (i=0; i<field_map->field_count(); i++) { |
2895 ClassFieldDescriptor* field = field_map->field_at(i); | |
2896 char type = field->field_type(); | |
2897 if (!is_primitive_field_type(type)) { | |
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2898 oop fld_o = mirror->obj_field(field->field_offset()); |
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2899 assert(verify_static_oop(ik, mirror, field->field_offset()), "sanity check"); |
0 | 2900 if (fld_o != NULL) { |
2901 int slot = field->field_index(); | |
2902 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
2903 delete field_map; | |
2904 return false; | |
2905 } | |
2906 } | |
2907 } else { | |
2908 if (is_reporting_primitive_fields()) { | |
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2909 address addr = (address)mirror + field->field_offset(); |
0 | 2910 int slot = field->field_index(); |
2911 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
2912 delete field_map; | |
2913 return false; | |
2914 } | |
2915 } | |
2916 } | |
2917 } | |
2918 delete field_map; | |
2919 | |
2920 return true; | |
2921 } | |
2922 | |
2923 return true; | |
2924 } | |
2925 | |
2926 // an object references a class and its instance fields | |
2927 // (static fields are ignored here as we report these as | |
2928 // references from the class). | |
2929 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
2930 // reference to the class | |
6983 | 2931 if (!CallbackInvoker::report_class_reference(o, o->klass()->java_mirror())) { |
0 | 2932 return false; |
2933 } | |
2934 | |
2935 // iterate over instance fields | |
2936 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
2937 for (int i=0; i<field_map->field_count(); i++) { | |
2938 ClassFieldDescriptor* field = field_map->field_at(i); | |
2939 char type = field->field_type(); | |
2940 if (!is_primitive_field_type(type)) { | |
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2941 oop fld_o = o->obj_field(field->field_offset()); |
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2942 // ignore any objects that aren't visible to profiler |
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2943 if (fld_o != NULL && ServiceUtil::visible_oop(fld_o)) { |
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2944 assert(Universe::heap()->is_in_reserved(fld_o), "unsafe code should not " |
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2945 "have references to Klass* anymore"); |
0 | 2946 int slot = field->field_index(); |
2947 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
2948 return false; | |
2949 } | |
2950 } | |
2951 } else { | |
2952 if (is_reporting_primitive_fields()) { | |
2953 // primitive instance field | |
2954 address addr = (address)o + field->field_offset(); | |
2955 int slot = field->field_index(); | |
2956 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
2957 return false; | |
2958 } | |
2959 } | |
2960 } | |
2961 } | |
2962 | |
2963 // if the object is a java.lang.String | |
2964 if (is_reporting_string_values() && | |
1142 | 2965 o->klass() == SystemDictionary::String_klass()) { |
0 | 2966 if (!CallbackInvoker::report_string_value(o)) { |
2967 return false; | |
2968 } | |
2969 } | |
2970 return true; | |
2971 } | |
2972 | |
2973 | |
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2974 // Collects all simple (non-stack) roots except for threads; |
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2975 // threads are handled in collect_stack_roots() as an optimization. |
0 | 2976 // if there's a heap root callback provided then the callback is |
2977 // invoked for each simple root. | |
2978 // if an object reference callback is provided then all simple | |
2979 // roots are pushed onto the marking stack so that they can be | |
2980 // processed later | |
2981 // | |
2982 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
2983 SimpleRootsClosure blk; | |
2984 | |
2985 // JNI globals | |
2986 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
2987 JNIHandles::oops_do(&blk); | |
2988 if (blk.stopped()) { | |
2989 return false; | |
2990 } | |
2991 | |
2992 // Preloaded classes and loader from the system dictionary | |
2993 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
2994 SystemDictionary::always_strong_oops_do(&blk); | |
6738
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2995 KlassToOopClosure klass_blk(&blk); |
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2996 ClassLoaderDataGraph::always_strong_oops_do(&blk, &klass_blk, false); |
0 | 2997 if (blk.stopped()) { |
2998 return false; | |
2999 } | |
3000 | |
3001 // Inflated monitors | |
3002 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
3003 ObjectSynchronizer::oops_do(&blk); | |
3004 if (blk.stopped()) { | |
3005 return false; | |
3006 } | |
3007 | |
3816
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changeset
|
3008 // threads are now handled in collect_stack_roots() |
0 | 3009 |
3010 // Other kinds of roots maintained by HotSpot | |
3011 // Many of these won't be visible but others (such as instances of important | |
3012 // exceptions) will be visible. | |
3013 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
3014 Universe::oops_do(&blk); | |
989
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6863023: need non-perm oops in code cache for JSR 292
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changeset
|
3015 |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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579
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changeset
|
3016 // If there are any non-perm roots in the code cache, visit them. |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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diff
changeset
|
3017 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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changeset
|
3018 CodeBlobToOopClosure look_in_blobs(&blk, false); |
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6863023: need non-perm oops in code cache for JSR 292
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changeset
|
3019 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
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|
3020 |
0 | 3021 return true; |
3022 } | |
3023 | |
3024 // Walk the stack of a given thread and find all references (locals | |
3025 // and JNI calls) and report these as stack references | |
3026 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
3027 JNILocalRootsClosure* blk) | |
3028 { | |
3029 oop threadObj = java_thread->threadObj(); | |
3030 assert(threadObj != NULL, "sanity check"); | |
3031 | |
3032 // only need to get the thread's tag once per thread | |
3033 jlong thread_tag = tag_for(_tag_map, threadObj); | |
3034 | |
3035 // also need the thread id | |
3036 jlong tid = java_lang_Thread::thread_id(threadObj); | |
3037 | |
3038 | |
3039 if (java_thread->has_last_Java_frame()) { | |
3040 | |
3041 // vframes are resource allocated | |
3042 Thread* current_thread = Thread::current(); | |
3043 ResourceMark rm(current_thread); | |
3044 HandleMark hm(current_thread); | |
3045 | |
3046 RegisterMap reg_map(java_thread); | |
3047 frame f = java_thread->last_frame(); | |
3048 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
3049 | |
3050 bool is_top_frame = true; | |
3051 int depth = 0; | |
3052 frame* last_entry_frame = NULL; | |
3053 | |
3054 while (vf != NULL) { | |
3055 if (vf->is_java_frame()) { | |
3056 | |
3057 // java frame (interpreted, compiled, ...) | |
3058 javaVFrame *jvf = javaVFrame::cast(vf); | |
3059 | |
3060 // the jmethodID | |
3061 jmethodID method = jvf->method()->jmethod_id(); | |
3062 | |
3063 if (!(jvf->method()->is_native())) { | |
3064 jlocation bci = (jlocation)jvf->bci(); | |
3065 StackValueCollection* locals = jvf->locals(); | |
3066 for (int slot=0; slot<locals->size(); slot++) { | |
3067 if (locals->at(slot)->type() == T_OBJECT) { | |
3068 oop o = locals->obj_at(slot)(); | |
3069 if (o == NULL) { | |
3070 continue; | |
3071 } | |
3072 | |
3073 // stack reference | |
3074 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
3075 bci, slot, o)) { | |
3076 return false; | |
3077 } | |
3078 } | |
3079 } | |
3080 } else { | |
3081 blk->set_context(thread_tag, tid, depth, method); | |
3082 if (is_top_frame) { | |
3083 // JNI locals for the top frame. | |
3084 java_thread->active_handles()->oops_do(blk); | |
3085 } else { | |
3086 if (last_entry_frame != NULL) { | |
3087 // JNI locals for the entry frame | |
3088 assert(last_entry_frame->is_entry_frame(), "checking"); | |
3089 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
3090 } | |
3091 } | |
3092 } | |
3093 last_entry_frame = NULL; | |
3094 depth++; | |
3095 } else { | |
3096 // externalVFrame - for an entry frame then we report the JNI locals | |
3097 // when we find the corresponding javaVFrame | |
3098 frame* fr = vf->frame_pointer(); | |
3099 assert(fr != NULL, "sanity check"); | |
3100 if (fr->is_entry_frame()) { | |
3101 last_entry_frame = fr; | |
3102 } | |
3103 } | |
3104 | |
3105 vf = vf->sender(); | |
3106 is_top_frame = false; | |
3107 } | |
3108 } else { | |
3109 // no last java frame but there may be JNI locals | |
3110 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
3111 java_thread->active_handles()->oops_do(blk); | |
3112 } | |
3113 return true; | |
3114 } | |
3115 | |
3116 | |
3816
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3117 // Collects the simple roots for all threads and collects all |
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|
3118 // stack roots - for each thread it walks the execution |
0 | 3119 // stack to find all references and local JNI refs. |
3120 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
3121 JNILocalRootsClosure blk; | |
3122 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
3123 oop threadObj = thread->threadObj(); | |
3124 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
3816
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6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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parents:
3815
diff
changeset
|
3125 // Collect the simple root for this thread before we |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3126 // collect its stack roots |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3127 if (!CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3128 threadObj)) { |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3129 return false; |
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6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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3815
diff
changeset
|
3130 } |
0 | 3131 if (!collect_stack_roots(thread, &blk)) { |
3132 return false; | |
3133 } | |
3134 } | |
3135 } | |
3136 return true; | |
3137 } | |
3138 | |
3139 // visit an object | |
3140 // first mark the object as visited | |
3141 // second get all the outbound references from this object (in other words, all | |
3142 // the objects referenced by this object). | |
3143 // | |
3144 bool VM_HeapWalkOperation::visit(oop o) { | |
3145 // mark object as visited | |
3146 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
3147 ObjectMarker::mark(o); | |
3148 | |
3149 // instance | |
3150 if (o->is_instance()) { | |
1142 | 3151 if (o->klass() == SystemDictionary::Class_klass()) { |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6266
diff
changeset
|
3152 if (!java_lang_Class::is_primitive(o)) { |
0 | 3153 // a java.lang.Class |
6725
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6964458: Reimplement class meta-data storage to use native memory
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|
3154 return iterate_over_class(o); |
0 | 3155 } |
3156 } else { | |
3157 return iterate_over_object(o); | |
3158 } | |
3159 } | |
3160 | |
3161 // object array | |
3162 if (o->is_objArray()) { | |
3163 return iterate_over_array(o); | |
3164 } | |
3165 | |
3166 // type array | |
3167 if (o->is_typeArray()) { | |
3168 return iterate_over_type_array(o); | |
3169 } | |
3170 | |
3171 return true; | |
3172 } | |
3173 | |
3174 void VM_HeapWalkOperation::doit() { | |
3175 ResourceMark rm; | |
3176 ObjectMarkerController marker; | |
3177 ClassFieldMapCacheMark cm; | |
3178 | |
3179 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
3180 | |
3181 // the heap walk starts with an initial object or the heap roots | |
3182 if (initial_object().is_null()) { | |
3815 | 3183 // If either collect_stack_roots() or collect_simple_roots() |
3184 // returns false at this point, then there are no mark bits | |
3185 // to reset. | |
3186 ObjectMarker::set_needs_reset(false); | |
3187 | |
3816
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diff
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|
3188 // Calling collect_stack_roots() before collect_simple_roots() |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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diff
changeset
|
3189 // can result in a big performance boost for an agent that is |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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changeset
|
3190 // focused on analyzing references in the thread stacks. |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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changeset
|
3191 if (!collect_stack_roots()) return; |
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6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
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3815
diff
changeset
|
3192 |
0 | 3193 if (!collect_simple_roots()) return; |
3815 | 3194 |
3195 // no early return so enable heap traversal to reset the mark bits | |
3196 ObjectMarker::set_needs_reset(true); | |
0 | 3197 } else { |
3198 visit_stack()->push(initial_object()()); | |
3199 } | |
3200 | |
3201 // object references required | |
3202 if (is_following_references()) { | |
3203 | |
3204 // visit each object until all reachable objects have been | |
3205 // visited or the callback asked to terminate the iteration. | |
3206 while (!visit_stack()->is_empty()) { | |
3207 oop o = visit_stack()->pop(); | |
3208 if (!ObjectMarker::visited(o)) { | |
3209 if (!visit(o)) { | |
3210 break; | |
3211 } | |
3212 } | |
3213 } | |
3214 } | |
3215 } | |
3216 | |
3217 // iterate over all objects that are reachable from a set of roots | |
3218 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
3219 jvmtiStackReferenceCallback stack_ref_callback, | |
3220 jvmtiObjectReferenceCallback object_ref_callback, | |
3221 const void* user_data) { | |
3222 MutexLocker ml(Heap_lock); | |
3223 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
3224 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
3225 VMThread::execute(&op); | |
3226 } | |
3227 | |
3228 // iterate over all objects that are reachable from a given object | |
3229 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
3230 jvmtiObjectReferenceCallback object_ref_callback, | |
3231 const void* user_data) { | |
3232 oop obj = JNIHandles::resolve(object); | |
3233 Handle initial_object(Thread::current(), obj); | |
3234 | |
3235 MutexLocker ml(Heap_lock); | |
3236 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
3237 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3238 VMThread::execute(&op); | |
3239 } | |
3240 | |
3241 // follow references from an initial object or the GC roots | |
3242 void JvmtiTagMap::follow_references(jint heap_filter, | |
3243 KlassHandle klass, | |
3244 jobject object, | |
3245 const jvmtiHeapCallbacks* callbacks, | |
3246 const void* user_data) | |
3247 { | |
3248 oop obj = JNIHandles::resolve(object); | |
3249 Handle initial_object(Thread::current(), obj); | |
3250 | |
3251 MutexLocker ml(Heap_lock); | |
3252 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
3253 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3254 VMThread::execute(&op); | |
3255 } | |
3256 | |
3257 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
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3258 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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parents:
2125
diff
changeset
|
3259 // No locks during VM bring-up (0 threads) and no safepoints after main |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3260 // thread creation and before VMThread creation (1 thread); initial GC |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3261 // verification can happen in that window which gets to here. |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3262 assert(Threads::number_of_threads() <= 1 || |
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3263 SafepointSynchronize::is_at_safepoint(), |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3264 "must be executed at a safepoint"); |
0 | 3265 if (JvmtiEnv::environments_might_exist()) { |
3266 JvmtiEnvIterator it; | |
3267 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
3268 JvmtiTagMap* tag_map = env->tag_map(); | |
3269 if (tag_map != NULL && !tag_map->is_empty()) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3270 tag_map->do_weak_oops(is_alive, f); |
0 | 3271 } |
3272 } | |
3273 } | |
3274 } | |
3275 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3276 void JvmtiTagMap::do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f) { |
0 | 3277 |
3278 // does this environment have the OBJECT_FREE event enabled | |
3279 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
3280 | |
3281 // counters used for trace message | |
3282 int freed = 0; | |
3283 int moved = 0; | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3284 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3285 JvmtiTagHashmap* hashmap = this->hashmap(); |
0 | 3286 |
3287 // reenable sizing (if disabled) | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3288 hashmap->set_resizing_enabled(true); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3289 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3290 // if the hashmap is empty then we can skip it |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3291 if (hashmap->_entry_count == 0) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3292 return; |
0 | 3293 } |
3294 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3295 // now iterate through each entry in the table |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3296 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3297 JvmtiTagHashmapEntry** table = hashmap->table(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3298 int size = hashmap->size(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3299 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3300 JvmtiTagHashmapEntry* delayed_add = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3301 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3302 for (int pos = 0; pos < size; ++pos) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3303 JvmtiTagHashmapEntry* entry = table[pos]; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3304 JvmtiTagHashmapEntry* prev = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3305 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3306 while (entry != NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3307 JvmtiTagHashmapEntry* next = entry->next(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3308 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3309 oop* obj = entry->object_addr(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3310 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3311 // has object been GC'ed |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3312 if (!is_alive->do_object_b(entry->object())) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3313 // grab the tag |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3314 jlong tag = entry->tag(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3315 guarantee(tag != 0, "checking"); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3316 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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1972
diff
changeset
|
3317 // remove GC'ed entry from hashmap and return the |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3318 // entry to the free list |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3319 hashmap->remove(prev, pos, entry); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3320 destroy_entry(entry); |
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6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3321 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3322 // post the event to the profiler |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3323 if (post_object_free) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3324 JvmtiExport::post_object_free(env(), tag); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3325 } |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3326 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3327 ++freed; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3328 } else { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3329 f->do_oop(entry->object_addr()); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3330 oop new_oop = entry->object(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3331 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3332 // 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
|
3333 // entry to its new location. |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3334 unsigned int new_pos = JvmtiTagHashmap::hash(new_oop, size); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3335 if (new_pos != (unsigned int)pos) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3336 if (prev == NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3337 table[pos] = next; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3338 } else { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3339 prev->set_next(next); |
0 | 3340 } |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3341 if (new_pos < (unsigned int)pos) { |
0 | 3342 entry->set_next(table[new_pos]); |
3343 table[new_pos] = entry; | |
3344 } else { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3345 // 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
|
3346 // hitting it again during this iteration. |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3347 entry->set_next(delayed_add); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3348 delayed_add = entry; |
0 | 3349 } |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3350 moved++; |
0 | 3351 } else { |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3352 // object didn't move |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3353 prev = entry; |
0 | 3354 } |
3355 } | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3356 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3357 entry = next; |
0 | 3358 } |
3359 } | |
3360 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3361 // Re-add all the entries which were kept aside |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3362 while (delayed_add != NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3363 JvmtiTagHashmapEntry* next = delayed_add->next(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3364 unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3365 delayed_add->set_next(table[pos]); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3366 table[pos] = delayed_add; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3367 delayed_add = next; |
0 | 3368 } |
3369 | |
3370 // stats | |
3371 if (TraceJVMTIObjectTagging) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3372 int post_total = hashmap->_entry_count; |
0 | 3373 int pre_total = post_total + freed; |
3374 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3375 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
|
3376 pre_total, post_total, freed, moved); |
0 | 3377 } |
3378 } |