Mercurial > hg > graal-jvmci-8
annotate src/share/vm/prims/jvmtiTagMap.cpp @ 23961:0cdf9eb633c4
8159515: Improve indy validation
Reviewed-by: jrose, hseigel, vlivanov, bmoloden, ctornqvi, mschoene
author | coleenp |
---|---|
date | Wed, 29 Jun 2016 11:52:27 -0400 |
parents | 9686a796c829 |
children | dd9cc155639c |
rev | line source |
---|---|
0 | 1 /* |
10265
92ef81e2f571
8003557: NPG: Klass* const k should be const Klass* k.
minqi
parents:
10161
diff
changeset
|
2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1142
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1142
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1142
diff
changeset
|
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" | |
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
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" | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6983
diff
changeset
|
48 #include "utilities/macros.hpp" |
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6983
diff
changeset
|
49 #if INCLUDE_ALL_GCS |
1972 | 50 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6983
diff
changeset
|
51 #endif // INCLUDE_ALL_GCS |
0 | 52 |
53 // JvmtiTagHashmapEntry | |
54 // | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
55 // Each entry encapsulates a reference to the tagged object |
0 | 56 // and the tag value. In addition an entry includes a next pointer which |
57 // is used to chain entries together. | |
58 | |
6197 | 59 class JvmtiTagHashmapEntry : public CHeapObj<mtInternal> { |
0 | 60 private: |
61 friend class JvmtiTagMap; | |
62 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
63 oop _object; // tagged object |
0 | 64 jlong _tag; // the tag |
65 JvmtiTagHashmapEntry* _next; // next on the list | |
66 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
67 inline void init(oop object, jlong tag) { |
0 | 68 _object = object; |
69 _tag = tag; | |
70 _next = NULL; | |
71 } | |
72 | |
73 // constructor | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
74 JvmtiTagHashmapEntry(oop object, jlong tag) { init(object, tag); } |
0 | 75 |
76 public: | |
77 | |
78 // accessor methods | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
79 inline oop object() const { return _object; } |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
80 inline oop* object_addr() { return &_object; } |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
81 inline jlong tag() const { return _tag; } |
0 | 82 |
83 inline void set_tag(jlong tag) { | |
84 assert(tag != 0, "can't be zero"); | |
85 _tag = tag; | |
86 } | |
87 | |
88 inline JvmtiTagHashmapEntry* next() const { return _next; } | |
89 inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; } | |
90 }; | |
91 | |
92 | |
93 // JvmtiTagHashmap | |
94 // | |
95 // A hashmap is essentially a table of pointers to entries. Entries | |
96 // are hashed to a location, or position in the table, and then | |
97 // chained from that location. The "key" for hashing is address of | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
98 // the object, or oop. The "value" is the tag value. |
0 | 99 // |
100 // A hashmap maintains a count of the number entries in the hashmap | |
101 // and resizes if the number of entries exceeds a given threshold. | |
102 // The threshold is specified as a percentage of the size - for | |
103 // example a threshold of 0.75 will trigger the hashmap to resize | |
104 // if the number of entries is >75% of table size. | |
105 // | |
106 // A hashmap provides functions for adding, removing, and finding | |
107 // entries. It also provides a function to iterate over all entries | |
108 // in the hashmap. | |
109 | |
6197 | 110 class JvmtiTagHashmap : public CHeapObj<mtInternal> { |
0 | 111 private: |
112 friend class JvmtiTagMap; | |
113 | |
114 enum { | |
115 small_trace_threshold = 10000, // threshold for tracing | |
116 medium_trace_threshold = 100000, | |
117 large_trace_threshold = 1000000, | |
118 initial_trace_threshold = small_trace_threshold | |
119 }; | |
120 | |
121 static int _sizes[]; // array of possible hashmap sizes | |
122 int _size; // actual size of the table | |
123 int _size_index; // index into size table | |
124 | |
125 int _entry_count; // number of entries in the hashmap | |
126 | |
127 float _load_factor; // load factor as a % of the size | |
128 int _resize_threshold; // computed threshold to trigger resizing. | |
129 bool _resizing_enabled; // indicates if hashmap can resize | |
130 | |
131 int _trace_threshold; // threshold for trace messages | |
132 | |
133 JvmtiTagHashmapEntry** _table; // the table of entries. | |
134 | |
135 // private accessors | |
136 int resize_threshold() const { return _resize_threshold; } | |
137 int trace_threshold() const { return _trace_threshold; } | |
138 | |
139 // initialize the hashmap | |
140 void init(int size_index=0, float load_factor=4.0f) { | |
141 int initial_size = _sizes[size_index]; | |
142 _size_index = size_index; | |
143 _size = initial_size; | |
144 _entry_count = 0; | |
145 if (TraceJVMTIObjectTagging) { | |
146 _trace_threshold = initial_trace_threshold; | |
147 } else { | |
148 _trace_threshold = -1; | |
149 } | |
150 _load_factor = load_factor; | |
151 _resize_threshold = (int)(_load_factor * _size); | |
152 _resizing_enabled = true; | |
153 size_t s = initial_size * sizeof(JvmtiTagHashmapEntry*); | |
6197 | 154 _table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
0 | 155 if (_table == NULL) { |
10161
746b070f5022
8011661: Insufficient memory message says "malloc" when sometimes it should say "mmap"
ccheung
parents:
8001
diff
changeset
|
156 vm_exit_out_of_memory(s, OOM_MALLOC_ERROR, |
746b070f5022
8011661: Insufficient memory message says "malloc" when sometimes it should say "mmap"
ccheung
parents:
8001
diff
changeset
|
157 "unable to allocate initial hashtable for jvmti object tags"); |
0 | 158 } |
159 for (int i=0; i<initial_size; i++) { | |
160 _table[i] = NULL; | |
161 } | |
162 } | |
163 | |
164 // hash a given key (oop) with the specified size | |
165 static unsigned int hash(oop key, int size) { | |
166 // shift right to get better distribution (as these bits will be zero | |
167 // with aligned addresses) | |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
10265
diff
changeset
|
168 unsigned int addr = (unsigned int)(cast_from_oop<intptr_t>(key)); |
0 | 169 #ifdef _LP64 |
170 return (addr >> 3) % size; | |
171 #else | |
172 return (addr >> 2) % size; | |
173 #endif | |
174 } | |
175 | |
176 // hash a given key (oop) | |
177 unsigned int hash(oop key) { | |
178 return hash(key, _size); | |
179 } | |
180 | |
181 // resize the hashmap - allocates a large table and re-hashes | |
182 // all entries into the new table. | |
183 void resize() { | |
184 int new_size_index = _size_index+1; | |
185 int new_size = _sizes[new_size_index]; | |
186 if (new_size < 0) { | |
187 // hashmap already at maximum capacity | |
188 return; | |
189 } | |
190 | |
191 // allocate new table | |
192 size_t s = new_size * sizeof(JvmtiTagHashmapEntry*); | |
6197 | 193 JvmtiTagHashmapEntry** new_table = (JvmtiTagHashmapEntry**)os::malloc(s, mtInternal); |
0 | 194 if (new_table == NULL) { |
195 warning("unable to allocate larger hashtable for jvmti object tags"); | |
196 set_resizing_enabled(false); | |
197 return; | |
198 } | |
199 | |
200 // initialize new table | |
201 int i; | |
202 for (i=0; i<new_size; i++) { | |
203 new_table[i] = NULL; | |
204 } | |
205 | |
206 // rehash all entries into the new table | |
207 for (i=0; i<_size; i++) { | |
208 JvmtiTagHashmapEntry* entry = _table[i]; | |
209 while (entry != NULL) { | |
210 JvmtiTagHashmapEntry* next = entry->next(); | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
211 oop key = entry->object(); |
0 | 212 assert(key != NULL, "jni weak reference cleared!!"); |
213 unsigned int h = hash(key, new_size); | |
214 JvmtiTagHashmapEntry* anchor = new_table[h]; | |
215 if (anchor == NULL) { | |
216 new_table[h] = entry; | |
217 entry->set_next(NULL); | |
218 } else { | |
219 entry->set_next(anchor); | |
220 new_table[h] = entry; | |
221 } | |
222 entry = next; | |
223 } | |
224 } | |
225 | |
226 // free old table and update settings. | |
227 os::free((void*)_table); | |
228 _table = new_table; | |
229 _size_index = new_size_index; | |
230 _size = new_size; | |
231 | |
232 // compute new resize threshold | |
233 _resize_threshold = (int)(_load_factor * _size); | |
234 } | |
235 | |
236 | |
237 // internal remove function - remove an entry at a given position in the | |
238 // table. | |
239 inline void remove(JvmtiTagHashmapEntry* prev, int pos, JvmtiTagHashmapEntry* entry) { | |
240 assert(pos >= 0 && pos < _size, "out of range"); | |
241 if (prev == NULL) { | |
242 _table[pos] = entry->next(); | |
243 } else { | |
244 prev->set_next(entry->next()); | |
245 } | |
246 assert(_entry_count > 0, "checking"); | |
247 _entry_count--; | |
248 } | |
249 | |
250 // resizing switch | |
251 bool is_resizing_enabled() const { return _resizing_enabled; } | |
252 void set_resizing_enabled(bool enable) { _resizing_enabled = enable; } | |
253 | |
254 // debugging | |
255 void print_memory_usage(); | |
256 void compute_next_trace_threshold(); | |
257 | |
258 public: | |
259 | |
260 // create a JvmtiTagHashmap of a preferred size and optionally a load factor. | |
261 // The preferred size is rounded down to an actual size. | |
262 JvmtiTagHashmap(int size, float load_factor=0.0f) { | |
263 int i=0; | |
264 while (_sizes[i] < size) { | |
265 if (_sizes[i] < 0) { | |
266 assert(i > 0, "sanity check"); | |
267 i--; | |
268 break; | |
269 } | |
270 i++; | |
271 } | |
272 | |
273 // if a load factor is specified then use it, otherwise use default | |
274 if (load_factor > 0.01f) { | |
275 init(i, load_factor); | |
276 } else { | |
277 init(i); | |
278 } | |
279 } | |
280 | |
281 // create a JvmtiTagHashmap with default settings | |
282 JvmtiTagHashmap() { | |
283 init(); | |
284 } | |
285 | |
286 // release table when JvmtiTagHashmap destroyed | |
287 ~JvmtiTagHashmap() { | |
288 if (_table != NULL) { | |
289 os::free((void*)_table); | |
290 _table = NULL; | |
291 } | |
292 } | |
293 | |
294 // accessors | |
295 int size() const { return _size; } | |
296 JvmtiTagHashmapEntry** table() const { return _table; } | |
297 int entry_count() const { return _entry_count; } | |
298 | |
299 // find an entry in the hashmap, returns NULL if not found. | |
300 inline JvmtiTagHashmapEntry* find(oop key) { | |
301 unsigned int h = hash(key); | |
302 JvmtiTagHashmapEntry* entry = _table[h]; | |
303 while (entry != NULL) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
304 if (entry->object() == key) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
305 return entry; |
0 | 306 } |
307 entry = entry->next(); | |
308 } | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
309 return NULL; |
0 | 310 } |
311 | |
312 | |
313 // add a new entry to hashmap | |
314 inline void add(oop key, JvmtiTagHashmapEntry* entry) { | |
315 assert(key != NULL, "checking"); | |
316 assert(find(key) == NULL, "duplicate detected"); | |
317 unsigned int h = hash(key); | |
318 JvmtiTagHashmapEntry* anchor = _table[h]; | |
319 if (anchor == NULL) { | |
320 _table[h] = entry; | |
321 entry->set_next(NULL); | |
322 } else { | |
323 entry->set_next(anchor); | |
324 _table[h] = entry; | |
325 } | |
326 | |
327 _entry_count++; | |
328 if (trace_threshold() > 0 && entry_count() >= trace_threshold()) { | |
329 assert(TraceJVMTIObjectTagging, "should only get here when tracing"); | |
330 print_memory_usage(); | |
331 compute_next_trace_threshold(); | |
332 } | |
333 | |
334 // if the number of entries exceed the threshold then resize | |
335 if (entry_count() > resize_threshold() && is_resizing_enabled()) { | |
336 resize(); | |
337 } | |
338 } | |
339 | |
340 // remove an entry with the given key. | |
341 inline JvmtiTagHashmapEntry* remove(oop key) { | |
342 unsigned int h = hash(key); | |
343 JvmtiTagHashmapEntry* entry = _table[h]; | |
344 JvmtiTagHashmapEntry* prev = NULL; | |
345 while (entry != NULL) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
346 if (key == entry->object()) { |
0 | 347 break; |
348 } | |
349 prev = entry; | |
350 entry = entry->next(); | |
351 } | |
352 if (entry != NULL) { | |
353 remove(prev, h, entry); | |
354 } | |
355 return entry; | |
356 } | |
357 | |
358 // iterate over all entries in the hashmap | |
359 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); | |
360 }; | |
361 | |
362 // possible hashmap sizes - odd primes that roughly double in size. | |
363 // To avoid excessive resizing the odd primes from 4801-76831 and | |
364 // 76831-307261 have been removed. The list must be terminated by -1. | |
365 int JvmtiTagHashmap::_sizes[] = { 4801, 76831, 307261, 614563, 1228891, | |
366 2457733, 4915219, 9830479, 19660831, 39321619, 78643219, -1 }; | |
367 | |
368 | |
369 // A supporting class for iterating over all entries in Hashmap | |
370 class JvmtiTagHashmapEntryClosure { | |
371 public: | |
372 virtual void do_entry(JvmtiTagHashmapEntry* entry) = 0; | |
373 }; | |
374 | |
375 | |
376 // iterate over all entries in the hashmap | |
377 void JvmtiTagHashmap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
378 for (int i=0; i<_size; i++) { | |
379 JvmtiTagHashmapEntry* entry = _table[i]; | |
380 JvmtiTagHashmapEntry* prev = NULL; | |
381 while (entry != NULL) { | |
382 // obtain the next entry before invoking do_entry - this is | |
383 // necessary because do_entry may remove the entry from the | |
384 // hashmap. | |
385 JvmtiTagHashmapEntry* next = entry->next(); | |
386 closure->do_entry(entry); | |
387 entry = next; | |
388 } | |
389 } | |
390 } | |
391 | |
392 // debugging | |
393 void JvmtiTagHashmap::print_memory_usage() { | |
394 intptr_t p = (intptr_t)this; | |
395 tty->print("[JvmtiTagHashmap @ " INTPTR_FORMAT, p); | |
396 | |
397 // table + entries in KB | |
398 int hashmap_usage = (size()*sizeof(JvmtiTagHashmapEntry*) + | |
399 entry_count()*sizeof(JvmtiTagHashmapEntry))/K; | |
400 | |
401 int weak_globals_usage = (int)(JNIHandles::weak_global_handle_memory_usage()/K); | |
402 tty->print_cr(", %d entries (%d KB) <JNI weak globals: %d KB>]", | |
403 entry_count(), hashmap_usage, weak_globals_usage); | |
404 } | |
405 | |
406 // compute threshold for the next trace message | |
407 void JvmtiTagHashmap::compute_next_trace_threshold() { | |
408 if (trace_threshold() < medium_trace_threshold) { | |
409 _trace_threshold += small_trace_threshold; | |
410 } else { | |
411 if (trace_threshold() < large_trace_threshold) { | |
412 _trace_threshold += medium_trace_threshold; | |
413 } else { | |
414 _trace_threshold += large_trace_threshold; | |
415 } | |
416 } | |
417 } | |
418 | |
419 // create a JvmtiTagMap | |
420 JvmtiTagMap::JvmtiTagMap(JvmtiEnv* env) : | |
421 _env(env), | |
422 _lock(Mutex::nonleaf+2, "JvmtiTagMap._lock", false), | |
423 _free_entries(NULL), | |
424 _free_entries_count(0) | |
425 { | |
426 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
427 assert(((JvmtiEnvBase *)env)->tag_map() == NULL, "tag map already exists for environment"); | |
428 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
429 _hashmap = new JvmtiTagHashmap(); |
0 | 430 |
431 // finally add us to the environment | |
432 ((JvmtiEnvBase *)env)->set_tag_map(this); | |
433 } | |
434 | |
435 | |
436 // destroy a JvmtiTagMap | |
437 JvmtiTagMap::~JvmtiTagMap() { | |
438 | |
439 // no lock acquired as we assume the enclosing environment is | |
440 // also being destroryed. | |
441 ((JvmtiEnvBase *)_env)->set_tag_map(NULL); | |
442 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
443 JvmtiTagHashmapEntry** table = _hashmap->table(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
444 for (int j = 0; j < _hashmap->size(); j++) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
445 JvmtiTagHashmapEntry* entry = table[j]; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
446 while (entry != NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
447 JvmtiTagHashmapEntry* next = entry->next(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
448 delete entry; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
449 entry = next; |
0 | 450 } |
451 } | |
452 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
453 // finally destroy the hashmap |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
454 delete _hashmap; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
455 _hashmap = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
456 |
0 | 457 // remove any entries on the free list |
458 JvmtiTagHashmapEntry* entry = _free_entries; | |
459 while (entry != NULL) { | |
460 JvmtiTagHashmapEntry* next = entry->next(); | |
461 delete entry; | |
462 entry = next; | |
463 } | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
464 _free_entries = NULL; |
0 | 465 } |
466 | |
467 // create a hashmap entry | |
468 // - if there's an entry on the (per-environment) free list then this | |
469 // is returned. Otherwise an new entry is allocated. | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
470 JvmtiTagHashmapEntry* JvmtiTagMap::create_entry(oop ref, jlong tag) { |
0 | 471 assert(Thread::current()->is_VM_thread() || is_locked(), "checking"); |
472 JvmtiTagHashmapEntry* entry; | |
473 if (_free_entries == NULL) { | |
474 entry = new JvmtiTagHashmapEntry(ref, tag); | |
475 } else { | |
476 assert(_free_entries_count > 0, "mismatched _free_entries_count"); | |
477 _free_entries_count--; | |
478 entry = _free_entries; | |
479 _free_entries = entry->next(); | |
480 entry->init(ref, tag); | |
481 } | |
482 return entry; | |
483 } | |
484 | |
485 // destroy an entry by returning it to the free list | |
486 void JvmtiTagMap::destroy_entry(JvmtiTagHashmapEntry* entry) { | |
487 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
488 // limit the size of the free list | |
489 if (_free_entries_count >= max_free_entries) { | |
490 delete entry; | |
491 } else { | |
492 entry->set_next(_free_entries); | |
493 _free_entries = entry; | |
494 _free_entries_count++; | |
495 } | |
496 } | |
497 | |
498 // returns the tag map for the given environments. If the tag map | |
499 // doesn't exist then it is created. | |
500 JvmtiTagMap* JvmtiTagMap::tag_map_for(JvmtiEnv* env) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
501 JvmtiTagMap* tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 502 if (tag_map == NULL) { |
503 MutexLocker mu(JvmtiThreadState_lock); | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
504 tag_map = ((JvmtiEnvBase*)env)->tag_map(); |
0 | 505 if (tag_map == NULL) { |
506 tag_map = new JvmtiTagMap(env); | |
507 } | |
508 } else { | |
509 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
510 } | |
511 return tag_map; | |
512 } | |
513 | |
514 // iterate over all entries in the tag map. | |
515 void JvmtiTagMap::entry_iterate(JvmtiTagHashmapEntryClosure* closure) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
516 hashmap()->entry_iterate(closure); |
0 | 517 } |
518 | |
519 // returns true if the hashmaps are empty | |
520 bool JvmtiTagMap::is_empty() { | |
521 assert(SafepointSynchronize::is_at_safepoint() || is_locked(), "checking"); | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
522 return hashmap()->entry_count() == 0; |
0 | 523 } |
524 | |
525 | |
526 // Return the tag value for an object, or 0 if the object is | |
527 // not tagged | |
528 // | |
529 static inline jlong tag_for(JvmtiTagMap* tag_map, oop o) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
530 JvmtiTagHashmapEntry* entry = tag_map->hashmap()->find(o); |
0 | 531 if (entry == NULL) { |
532 return 0; | |
533 } else { | |
534 return entry->tag(); | |
535 } | |
536 } | |
537 | |
538 | |
539 // A CallbackWrapper is a support class for querying and tagging an object | |
540 // around a callback to a profiler. The constructor does pre-callback | |
541 // work to get the tag value, klass tag value, ... and the destructor | |
542 // does the post-callback work of tagging or untagging the object. | |
543 // | |
544 // { | |
545 // CallbackWrapper wrapper(tag_map, o); | |
546 // | |
547 // (*callback)(wrapper.klass_tag(), wrapper.obj_size(), wrapper.obj_tag_p(), ...) | |
548 // | |
549 // } // wrapper goes out of scope here which results in the destructor | |
550 // checking to see if the object has been tagged, untagged, or the | |
551 // tag value has changed. | |
552 // | |
553 class CallbackWrapper : public StackObj { | |
554 private: | |
555 JvmtiTagMap* _tag_map; | |
556 JvmtiTagHashmap* _hashmap; | |
557 JvmtiTagHashmapEntry* _entry; | |
558 oop _o; | |
559 jlong _obj_size; | |
560 jlong _obj_tag; | |
561 jlong _klass_tag; | |
562 | |
563 protected: | |
564 JvmtiTagMap* tag_map() const { return _tag_map; } | |
565 | |
566 // invoked post-callback to tag, untag, or update the tag of an object | |
567 void inline post_callback_tag_update(oop o, JvmtiTagHashmap* hashmap, | |
568 JvmtiTagHashmapEntry* entry, jlong obj_tag); | |
569 public: | |
570 CallbackWrapper(JvmtiTagMap* tag_map, oop o) { | |
571 assert(Thread::current()->is_VM_thread() || tag_map->is_locked(), | |
572 "MT unsafe or must be VM thread"); | |
573 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
574 // object to tag |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
575 _o = o; |
0 | 576 |
577 // object size | |
6171
588f559105c1
7178846: IterateThroughHeap: heap_iteration_callback passes a negative size
sla
parents:
4929
diff
changeset
|
578 _obj_size = (jlong)_o->size() * wordSize; |
0 | 579 |
580 // record the context | |
581 _tag_map = tag_map; | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
582 _hashmap = tag_map->hashmap(); |
0 | 583 _entry = _hashmap->find(_o); |
584 | |
585 // get object tag | |
586 _obj_tag = (_entry == NULL) ? 0 : _entry->tag(); | |
587 | |
588 // get the class and the class's tag value | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
589 assert(SystemDictionary::Class_klass()->oop_is_instanceMirror(), "Is not?"); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
590 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
591 _klass_tag = tag_for(tag_map, _o->klass()->java_mirror()); |
0 | 592 } |
593 | |
594 ~CallbackWrapper() { | |
595 post_callback_tag_update(_o, _hashmap, _entry, _obj_tag); | |
596 } | |
597 | |
598 inline jlong* obj_tag_p() { return &_obj_tag; } | |
599 inline jlong obj_size() const { return _obj_size; } | |
600 inline jlong obj_tag() const { return _obj_tag; } | |
601 inline jlong klass_tag() const { return _klass_tag; } | |
602 }; | |
603 | |
604 | |
605 | |
606 // callback post-callback to tag, untag, or update the tag of an object | |
607 void inline CallbackWrapper::post_callback_tag_update(oop o, | |
608 JvmtiTagHashmap* hashmap, | |
609 JvmtiTagHashmapEntry* entry, | |
610 jlong obj_tag) { | |
611 if (entry == NULL) { | |
612 if (obj_tag != 0) { | |
613 // callback has tagged the object | |
614 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
615 entry = tag_map()->create_entry(o, obj_tag); |
0 | 616 hashmap->add(o, entry); |
617 } | |
618 } else { | |
619 // object was previously tagged - the callback may have untagged | |
620 // the object or changed the tag value | |
621 if (obj_tag == 0) { | |
622 | |
623 JvmtiTagHashmapEntry* entry_removed = hashmap->remove(o); | |
624 assert(entry_removed == entry, "checking"); | |
625 tag_map()->destroy_entry(entry); | |
626 | |
627 } else { | |
628 if (obj_tag != entry->tag()) { | |
629 entry->set_tag(obj_tag); | |
630 } | |
631 } | |
632 } | |
633 } | |
634 | |
635 // An extended CallbackWrapper used when reporting an object reference | |
636 // to the agent. | |
637 // | |
638 // { | |
639 // TwoOopCallbackWrapper wrapper(tag_map, referrer, o); | |
640 // | |
641 // (*callback)(wrapper.klass_tag(), | |
642 // wrapper.obj_size(), | |
643 // wrapper.obj_tag_p() | |
644 // wrapper.referrer_tag_p(), ...) | |
645 // | |
646 // } // wrapper goes out of scope here which results in the destructor | |
647 // checking to see if the referrer object has been tagged, untagged, | |
648 // or the tag value has changed. | |
649 // | |
650 class TwoOopCallbackWrapper : public CallbackWrapper { | |
651 private: | |
652 bool _is_reference_to_self; | |
653 JvmtiTagHashmap* _referrer_hashmap; | |
654 JvmtiTagHashmapEntry* _referrer_entry; | |
655 oop _referrer; | |
656 jlong _referrer_obj_tag; | |
657 jlong _referrer_klass_tag; | |
658 jlong* _referrer_tag_p; | |
659 | |
660 bool is_reference_to_self() const { return _is_reference_to_self; } | |
661 | |
662 public: | |
663 TwoOopCallbackWrapper(JvmtiTagMap* tag_map, oop referrer, oop o) : | |
664 CallbackWrapper(tag_map, o) | |
665 { | |
666 // self reference needs to be handled in a special way | |
667 _is_reference_to_self = (referrer == o); | |
668 | |
669 if (_is_reference_to_self) { | |
670 _referrer_klass_tag = klass_tag(); | |
671 _referrer_tag_p = obj_tag_p(); | |
672 } else { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
673 _referrer = referrer; |
0 | 674 // record the context |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
675 _referrer_hashmap = tag_map->hashmap(); |
0 | 676 _referrer_entry = _referrer_hashmap->find(_referrer); |
677 | |
678 // get object tag | |
679 _referrer_obj_tag = (_referrer_entry == NULL) ? 0 : _referrer_entry->tag(); | |
680 _referrer_tag_p = &_referrer_obj_tag; | |
681 | |
682 // get referrer class tag. | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
683 _referrer_klass_tag = tag_for(tag_map, _referrer->klass()->java_mirror()); |
0 | 684 } |
685 } | |
686 | |
687 ~TwoOopCallbackWrapper() { | |
688 if (!is_reference_to_self()){ | |
689 post_callback_tag_update(_referrer, | |
690 _referrer_hashmap, | |
691 _referrer_entry, | |
692 _referrer_obj_tag); | |
693 } | |
694 } | |
695 | |
696 // address of referrer tag | |
697 // (for a self reference this will return the same thing as obj_tag_p()) | |
698 inline jlong* referrer_tag_p() { return _referrer_tag_p; } | |
699 | |
700 // referrer's class tag | |
701 inline jlong referrer_klass_tag() { return _referrer_klass_tag; } | |
702 }; | |
703 | |
704 // tag an object | |
705 // | |
706 // This function is performance critical. If many threads attempt to tag objects | |
707 // around the same time then it's possible that the Mutex associated with the | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
708 // tag map will be a hot lock. |
0 | 709 void JvmtiTagMap::set_tag(jobject object, jlong tag) { |
710 MutexLocker ml(lock()); | |
711 | |
712 // resolve the object | |
713 oop o = JNIHandles::resolve_non_null(object); | |
714 | |
715 // see if the object is already tagged | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
716 JvmtiTagHashmap* hashmap = _hashmap; |
0 | 717 JvmtiTagHashmapEntry* entry = hashmap->find(o); |
718 | |
719 // if the object is not already tagged then we tag it | |
720 if (entry == NULL) { | |
721 if (tag != 0) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
722 entry = create_entry(o, tag); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
723 hashmap->add(o, entry); |
0 | 724 } else { |
725 // no-op | |
726 } | |
727 } else { | |
728 // if the object is already tagged then we either update | |
729 // the tag (if a new tag value has been provided) | |
730 // or remove the object if the new tag value is 0. | |
731 if (tag == 0) { | |
732 hashmap->remove(o); | |
733 destroy_entry(entry); | |
734 } else { | |
735 entry->set_tag(tag); | |
736 } | |
737 } | |
738 } | |
739 | |
740 // get the tag for an object | |
741 jlong JvmtiTagMap::get_tag(jobject object) { | |
742 MutexLocker ml(lock()); | |
743 | |
744 // resolve the object | |
745 oop o = JNIHandles::resolve_non_null(object); | |
746 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
747 return tag_for(this, o); |
0 | 748 } |
749 | |
750 | |
751 // Helper class used to describe the static or instance fields of a class. | |
752 // For each field it holds the field index (as defined by the JVMTI specification), | |
753 // the field type, and the offset. | |
754 | |
6197 | 755 class ClassFieldDescriptor: public CHeapObj<mtInternal> { |
0 | 756 private: |
757 int _field_index; | |
758 int _field_offset; | |
759 char _field_type; | |
760 public: | |
761 ClassFieldDescriptor(int index, char type, int offset) : | |
762 _field_index(index), _field_type(type), _field_offset(offset) { | |
763 } | |
764 int field_index() const { return _field_index; } | |
765 char field_type() const { return _field_type; } | |
766 int field_offset() const { return _field_offset; } | |
767 }; | |
768 | |
6197 | 769 class ClassFieldMap: public CHeapObj<mtInternal> { |
0 | 770 private: |
771 enum { | |
772 initial_field_count = 5 | |
773 }; | |
774 | |
775 // list of field descriptors | |
776 GrowableArray<ClassFieldDescriptor*>* _fields; | |
777 | |
778 // constructor | |
779 ClassFieldMap(); | |
780 | |
781 // add a field | |
782 void add(int index, char type, int offset); | |
783 | |
784 // returns the field count for the given class | |
785 static int compute_field_count(instanceKlassHandle ikh); | |
786 | |
787 public: | |
788 ~ClassFieldMap(); | |
789 | |
790 // access | |
791 int field_count() { return _fields->length(); } | |
792 ClassFieldDescriptor* field_at(int i) { return _fields->at(i); } | |
793 | |
794 // functions to create maps of static or instance fields | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
795 static ClassFieldMap* create_map_of_static_fields(Klass* k); |
0 | 796 static ClassFieldMap* create_map_of_instance_fields(oop obj); |
797 }; | |
798 | |
799 ClassFieldMap::ClassFieldMap() { | |
6197 | 800 _fields = new (ResourceObj::C_HEAP, mtInternal) |
801 GrowableArray<ClassFieldDescriptor*>(initial_field_count, true); | |
0 | 802 } |
803 | |
804 ClassFieldMap::~ClassFieldMap() { | |
805 for (int i=0; i<_fields->length(); i++) { | |
806 delete _fields->at(i); | |
807 } | |
808 delete _fields; | |
809 } | |
810 | |
811 void ClassFieldMap::add(int index, char type, int offset) { | |
812 ClassFieldDescriptor* field = new ClassFieldDescriptor(index, type, offset); | |
813 _fields->append(field); | |
814 } | |
815 | |
816 // Returns a heap allocated ClassFieldMap to describe the static fields | |
817 // of the given class. | |
818 // | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
819 ClassFieldMap* ClassFieldMap::create_map_of_static_fields(Klass* k) { |
0 | 820 HandleMark hm; |
821 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); | |
822 | |
823 // create the field map | |
824 ClassFieldMap* field_map = new ClassFieldMap(); | |
825 | |
826 FilteredFieldStream f(ikh, false, false); | |
827 int max_field_index = f.field_count()-1; | |
828 | |
829 int index = 0; | |
830 for (FilteredFieldStream fld(ikh, true, true); !fld.eos(); fld.next(), index++) { | |
831 // ignore instance fields | |
832 if (!fld.access_flags().is_static()) { | |
833 continue; | |
834 } | |
835 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
836 } | |
837 return field_map; | |
838 } | |
839 | |
840 // Returns a heap allocated ClassFieldMap to describe the instance fields | |
841 // of the given class. All instance fields are included (this means public | |
842 // and private fields declared in superclasses and superinterfaces too). | |
843 // | |
844 ClassFieldMap* ClassFieldMap::create_map_of_instance_fields(oop obj) { | |
845 HandleMark hm; | |
846 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), obj->klass()); | |
847 | |
848 // create the field map | |
849 ClassFieldMap* field_map = new ClassFieldMap(); | |
850 | |
851 FilteredFieldStream f(ikh, false, false); | |
852 | |
853 int max_field_index = f.field_count()-1; | |
854 | |
855 int index = 0; | |
856 for (FilteredFieldStream fld(ikh, false, false); !fld.eos(); fld.next(), index++) { | |
857 // ignore static fields | |
858 if (fld.access_flags().is_static()) { | |
859 continue; | |
860 } | |
861 field_map->add(max_field_index - index, fld.signature()->byte_at(0), fld.offset()); | |
862 } | |
863 | |
864 return field_map; | |
865 } | |
866 | |
867 // Helper class used to cache a ClassFileMap for the instance fields of | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
868 // a cache. A JvmtiCachedClassFieldMap can be cached by an InstanceKlass during |
0 | 869 // heap iteration and avoid creating a field map for each object in the heap |
870 // (only need to create the map when the first instance of a class is encountered). | |
871 // | |
6197 | 872 class JvmtiCachedClassFieldMap : public CHeapObj<mtInternal> { |
0 | 873 private: |
874 enum { | |
875 initial_class_count = 200 | |
876 }; | |
877 ClassFieldMap* _field_map; | |
878 | |
879 ClassFieldMap* field_map() const { return _field_map; } | |
880 | |
881 JvmtiCachedClassFieldMap(ClassFieldMap* field_map); | |
882 ~JvmtiCachedClassFieldMap(); | |
883 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
884 static GrowableArray<InstanceKlass*>* _class_list; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
885 static void add_to_class_list(InstanceKlass* ik); |
0 | 886 |
887 public: | |
888 // returns the field map for a given object (returning map cached | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
889 // by InstanceKlass if possible |
0 | 890 static ClassFieldMap* get_map_of_instance_fields(oop obj); |
891 | |
892 // removes the field map from all instanceKlasses - should be | |
893 // called before VM operation completes | |
894 static void clear_cache(); | |
895 | |
896 // returns the number of ClassFieldMap cached by instanceKlasses | |
897 static int cached_field_map_count(); | |
898 }; | |
899 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
900 GrowableArray<InstanceKlass*>* JvmtiCachedClassFieldMap::_class_list; |
0 | 901 |
902 JvmtiCachedClassFieldMap::JvmtiCachedClassFieldMap(ClassFieldMap* field_map) { | |
903 _field_map = field_map; | |
904 } | |
905 | |
906 JvmtiCachedClassFieldMap::~JvmtiCachedClassFieldMap() { | |
907 if (_field_map != NULL) { | |
908 delete _field_map; | |
909 } | |
910 } | |
911 | |
912 // Marker class to ensure that the class file map cache is only used in a defined | |
913 // scope. | |
914 class ClassFieldMapCacheMark : public StackObj { | |
915 private: | |
916 static bool _is_active; | |
917 public: | |
918 ClassFieldMapCacheMark() { | |
919 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
920 assert(JvmtiCachedClassFieldMap::cached_field_map_count() == 0, "cache not empty"); | |
921 assert(!_is_active, "ClassFieldMapCacheMark cannot be nested"); | |
922 _is_active = true; | |
923 } | |
924 ~ClassFieldMapCacheMark() { | |
925 JvmtiCachedClassFieldMap::clear_cache(); | |
926 _is_active = false; | |
927 } | |
928 static bool is_active() { return _is_active; } | |
929 }; | |
930 | |
931 bool ClassFieldMapCacheMark::_is_active; | |
932 | |
933 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
934 // record that the given InstanceKlass is caching a field map |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
935 void JvmtiCachedClassFieldMap::add_to_class_list(InstanceKlass* ik) { |
0 | 936 if (_class_list == NULL) { |
6197 | 937 _class_list = new (ResourceObj::C_HEAP, mtInternal) |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
938 GrowableArray<InstanceKlass*>(initial_class_count, true); |
0 | 939 } |
940 _class_list->push(ik); | |
941 } | |
942 | |
943 // returns the instance field map for the given object | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
944 // (returns field map cached by the InstanceKlass if possible) |
0 | 945 ClassFieldMap* JvmtiCachedClassFieldMap::get_map_of_instance_fields(oop obj) { |
946 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
947 assert(ClassFieldMapCacheMark::is_active(), "ClassFieldMapCacheMark not active"); | |
948 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
949 Klass* k = obj->klass(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
950 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 951 |
952 // return cached map if possible | |
953 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); | |
954 if (cached_map != NULL) { | |
955 assert(cached_map->field_map() != NULL, "missing field list"); | |
956 return cached_map->field_map(); | |
957 } else { | |
958 ClassFieldMap* field_map = ClassFieldMap::create_map_of_instance_fields(obj); | |
959 cached_map = new JvmtiCachedClassFieldMap(field_map); | |
960 ik->set_jvmti_cached_class_field_map(cached_map); | |
961 add_to_class_list(ik); | |
962 return field_map; | |
963 } | |
964 } | |
965 | |
966 // remove the fields maps cached from all instanceKlasses | |
967 void JvmtiCachedClassFieldMap::clear_cache() { | |
968 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
969 if (_class_list != NULL) { | |
970 for (int i = 0; i < _class_list->length(); i++) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
971 InstanceKlass* ik = _class_list->at(i); |
0 | 972 JvmtiCachedClassFieldMap* cached_map = ik->jvmti_cached_class_field_map(); |
973 assert(cached_map != NULL, "should not be NULL"); | |
974 ik->set_jvmti_cached_class_field_map(NULL); | |
975 delete cached_map; // deletes the encapsulated field map | |
976 } | |
977 delete _class_list; | |
978 _class_list = NULL; | |
979 } | |
980 } | |
981 | |
982 // returns the number of ClassFieldMap cached by instanceKlasses | |
983 int JvmtiCachedClassFieldMap::cached_field_map_count() { | |
984 return (_class_list == NULL) ? 0 : _class_list->length(); | |
985 } | |
986 | |
987 // helper function to indicate if an object is filtered by its tag or class tag | |
988 static inline bool is_filtered_by_heap_filter(jlong obj_tag, | |
989 jlong klass_tag, | |
990 int heap_filter) { | |
991 // apply the heap filter | |
992 if (obj_tag != 0) { | |
993 // filter out tagged objects | |
994 if (heap_filter & JVMTI_HEAP_FILTER_TAGGED) return true; | |
995 } else { | |
996 // filter out untagged objects | |
997 if (heap_filter & JVMTI_HEAP_FILTER_UNTAGGED) return true; | |
998 } | |
999 if (klass_tag != 0) { | |
1000 // filter out objects with tagged classes | |
1001 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_TAGGED) return true; | |
1002 } else { | |
1003 // filter out objects with untagged classes. | |
1004 if (heap_filter & JVMTI_HEAP_FILTER_CLASS_UNTAGGED) return true; | |
1005 } | |
1006 return false; | |
1007 } | |
1008 | |
1009 // helper function to indicate if an object is filtered by a klass filter | |
1010 static inline bool is_filtered_by_klass_filter(oop obj, KlassHandle klass_filter) { | |
1011 if (!klass_filter.is_null()) { | |
1012 if (obj->klass() != klass_filter()) { | |
1013 return true; | |
1014 } | |
1015 } | |
1016 return false; | |
1017 } | |
1018 | |
1019 // helper function to tell if a field is a primitive field or not | |
1020 static inline bool is_primitive_field_type(char type) { | |
1021 return (type != 'L' && type != '['); | |
1022 } | |
1023 | |
1024 // helper function to copy the value from location addr to jvalue. | |
1025 static inline void copy_to_jvalue(jvalue *v, address addr, jvmtiPrimitiveType value_type) { | |
1026 switch (value_type) { | |
1027 case JVMTI_PRIMITIVE_TYPE_BOOLEAN : { v->z = *(jboolean*)addr; break; } | |
1028 case JVMTI_PRIMITIVE_TYPE_BYTE : { v->b = *(jbyte*)addr; break; } | |
1029 case JVMTI_PRIMITIVE_TYPE_CHAR : { v->c = *(jchar*)addr; break; } | |
1030 case JVMTI_PRIMITIVE_TYPE_SHORT : { v->s = *(jshort*)addr; break; } | |
1031 case JVMTI_PRIMITIVE_TYPE_INT : { v->i = *(jint*)addr; break; } | |
1032 case JVMTI_PRIMITIVE_TYPE_LONG : { v->j = *(jlong*)addr; break; } | |
1033 case JVMTI_PRIMITIVE_TYPE_FLOAT : { v->f = *(jfloat*)addr; break; } | |
1034 case JVMTI_PRIMITIVE_TYPE_DOUBLE : { v->d = *(jdouble*)addr; break; } | |
1035 default: ShouldNotReachHere(); | |
1036 } | |
1037 } | |
1038 | |
1039 // helper function to invoke string primitive value callback | |
1040 // returns visit control flags | |
1041 static jint invoke_string_value_callback(jvmtiStringPrimitiveValueCallback cb, | |
1042 CallbackWrapper* wrapper, | |
1043 oop str, | |
1044 void* user_data) | |
1045 { | |
1142 | 1046 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 1047 |
22828
9686a796c829
6584008: jvmtiStringPrimitiveCallback should not be invoked when string value is null
aph
parents:
20278
diff
changeset
|
1048 typeArrayOop s_value = java_lang_String::value(str); |
9686a796c829
6584008: jvmtiStringPrimitiveCallback should not be invoked when string value is null
aph
parents:
20278
diff
changeset
|
1049 |
9686a796c829
6584008: jvmtiStringPrimitiveCallback should not be invoked when string value is null
aph
parents:
20278
diff
changeset
|
1050 // JDK-6584008: the value field may be null if a String instance is |
9686a796c829
6584008: jvmtiStringPrimitiveCallback should not be invoked when string value is null
aph
parents:
20278
diff
changeset
|
1051 // partially constructed. |
9686a796c829
6584008: jvmtiStringPrimitiveCallback should not be invoked when string value is null
aph
parents:
20278
diff
changeset
|
1052 if (s_value == NULL) { |
9686a796c829
6584008: jvmtiStringPrimitiveCallback should not be invoked when string value is null
aph
parents:
20278
diff
changeset
|
1053 return 0; |
9686a796c829
6584008: jvmtiStringPrimitiveCallback should not be invoked when string value is null
aph
parents:
20278
diff
changeset
|
1054 } |
0 | 1055 // get the string value and length |
1056 // (string value may be offset from the base) | |
1057 int s_len = java_lang_String::length(str); | |
1058 int s_offset = java_lang_String::offset(str); | |
1059 jchar* value; | |
1060 if (s_len > 0) { | |
1061 value = s_value->char_at_addr(s_offset); | |
1062 } else { | |
1063 value = (jchar*) s_value->base(T_CHAR); | |
1064 } | |
1065 | |
1066 // invoke the callback | |
1067 return (*cb)(wrapper->klass_tag(), | |
1068 wrapper->obj_size(), | |
1069 wrapper->obj_tag_p(), | |
1070 value, | |
1071 (jint)s_len, | |
1072 user_data); | |
1073 } | |
1074 | |
1075 // helper function to invoke string primitive value callback | |
1076 // returns visit control flags | |
1077 static jint invoke_array_primitive_value_callback(jvmtiArrayPrimitiveValueCallback cb, | |
1078 CallbackWrapper* wrapper, | |
1079 oop obj, | |
1080 void* user_data) | |
1081 { | |
1082 assert(obj->is_typeArray(), "not a primitive array"); | |
1083 | |
1084 // get base address of first element | |
1085 typeArrayOop array = typeArrayOop(obj); | |
6831
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
coleenp
parents:
6738
diff
changeset
|
1086 BasicType type = TypeArrayKlass::cast(array->klass())->element_type(); |
0 | 1087 void* elements = array->base(type); |
1088 | |
1089 // jvmtiPrimitiveType is defined so this mapping is always correct | |
1090 jvmtiPrimitiveType elem_type = (jvmtiPrimitiveType)type2char(type); | |
1091 | |
1092 return (*cb)(wrapper->klass_tag(), | |
1093 wrapper->obj_size(), | |
1094 wrapper->obj_tag_p(), | |
1095 (jint)array->length(), | |
1096 elem_type, | |
1097 elements, | |
1098 user_data); | |
1099 } | |
1100 | |
1101 // helper function to invoke the primitive field callback for all static fields | |
1102 // of a given class | |
1103 static jint invoke_primitive_field_callback_for_static_fields | |
1104 (CallbackWrapper* wrapper, | |
1105 oop obj, | |
1106 jvmtiPrimitiveFieldCallback cb, | |
1107 void* user_data) | |
1108 { | |
1109 // for static fields only the index will be set | |
1110 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1111 | |
1142 | 1112 assert(obj->klass() == SystemDictionary::Class_klass(), "not a class"); |
0 | 1113 if (java_lang_Class::is_primitive(obj)) { |
1114 return 0; | |
1115 } | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1116 Klass* klass = java_lang_Class::as_Klass(obj); |
0 | 1117 |
1118 // ignore classes for object and type arrays | |
1119 if (!klass->oop_is_instance()) { | |
1120 return 0; | |
1121 } | |
1122 | |
1123 // ignore classes which aren't linked yet | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1124 InstanceKlass* ik = InstanceKlass::cast(klass); |
0 | 1125 if (!ik->is_linked()) { |
1126 return 0; | |
1127 } | |
1128 | |
1129 // get the field map | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1130 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
0 | 1131 |
1132 // invoke the callback for each static primitive field | |
1133 for (int i=0; i<field_map->field_count(); i++) { | |
1134 ClassFieldDescriptor* field = field_map->field_at(i); | |
1135 | |
1136 // ignore non-primitive fields | |
1137 char type = field->field_type(); | |
1138 if (!is_primitive_field_type(type)) { | |
1139 continue; | |
1140 } | |
1141 // one-to-one mapping | |
1142 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1143 | |
1144 // get offset and field value | |
1145 int offset = field->field_offset(); | |
6871
045cb62046a7
7093328: JVMTI: jvmtiPrimitiveFieldCallback always report 0's for static primitives
rbackman
parents:
6856
diff
changeset
|
1146 address addr = (address)klass->java_mirror() + offset; |
0 | 1147 jvalue value; |
1148 copy_to_jvalue(&value, addr, value_type); | |
1149 | |
1150 // field index | |
1151 reference_info.field.index = field->field_index(); | |
1152 | |
1153 // invoke the callback | |
1154 jint res = (*cb)(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
1155 &reference_info, | |
1156 wrapper->klass_tag(), | |
1157 wrapper->obj_tag_p(), | |
1158 value, | |
1159 value_type, | |
1160 user_data); | |
1161 if (res & JVMTI_VISIT_ABORT) { | |
1162 delete field_map; | |
1163 return res; | |
1164 } | |
1165 } | |
1166 | |
1167 delete field_map; | |
1168 return 0; | |
1169 } | |
1170 | |
1171 // helper function to invoke the primitive field callback for all instance fields | |
1172 // of a given object | |
1173 static jint invoke_primitive_field_callback_for_instance_fields( | |
1174 CallbackWrapper* wrapper, | |
1175 oop obj, | |
1176 jvmtiPrimitiveFieldCallback cb, | |
1177 void* user_data) | |
1178 { | |
1179 // for instance fields only the index will be set | |
1180 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
1181 | |
1182 // get the map of the instance fields | |
1183 ClassFieldMap* fields = JvmtiCachedClassFieldMap::get_map_of_instance_fields(obj); | |
1184 | |
1185 // invoke the callback for each instance primitive field | |
1186 for (int i=0; i<fields->field_count(); i++) { | |
1187 ClassFieldDescriptor* field = fields->field_at(i); | |
1188 | |
1189 // ignore non-primitive fields | |
1190 char type = field->field_type(); | |
1191 if (!is_primitive_field_type(type)) { | |
1192 continue; | |
1193 } | |
1194 // one-to-one mapping | |
1195 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
1196 | |
1197 // get offset and field value | |
1198 int offset = field->field_offset(); | |
1199 address addr = (address)obj + offset; | |
1200 jvalue value; | |
1201 copy_to_jvalue(&value, addr, value_type); | |
1202 | |
1203 // field index | |
1204 reference_info.field.index = field->field_index(); | |
1205 | |
1206 // invoke the callback | |
1207 jint res = (*cb)(JVMTI_HEAP_REFERENCE_FIELD, | |
1208 &reference_info, | |
1209 wrapper->klass_tag(), | |
1210 wrapper->obj_tag_p(), | |
1211 value, | |
1212 value_type, | |
1213 user_data); | |
1214 if (res & JVMTI_VISIT_ABORT) { | |
1215 return res; | |
1216 } | |
1217 } | |
1218 return 0; | |
1219 } | |
1220 | |
1221 | |
1222 // VM operation to iterate over all objects in the heap (both reachable | |
1223 // and unreachable) | |
1224 class VM_HeapIterateOperation: public VM_Operation { | |
1225 private: | |
1226 ObjectClosure* _blk; | |
1227 public: | |
1228 VM_HeapIterateOperation(ObjectClosure* blk) { _blk = blk; } | |
1229 | |
1230 VMOp_Type type() const { return VMOp_HeapIterateOperation; } | |
1231 void doit() { | |
1232 // allows class files maps to be cached during iteration | |
1233 ClassFieldMapCacheMark cm; | |
1234 | |
1235 // make sure that heap is parsable (fills TLABs with filler objects) | |
1236 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1237 | |
1238 // Verify heap before iteration - if the heap gets corrupted then | |
1239 // JVMTI's IterateOverHeap will crash. | |
1240 if (VerifyBeforeIteration) { | |
1241 Universe::verify(); | |
1242 } | |
1243 | |
1244 // do the iteration | |
517
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
356
diff
changeset
|
1245 // If this operation encounters a bad object when using CMS, |
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
356
diff
changeset
|
1246 // consider using safe_object_iterate() which avoids perm gen |
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
356
diff
changeset
|
1247 // objects that may contain bad references. |
0 | 1248 Universe::heap()->object_iterate(_blk); |
1249 } | |
1250 | |
1251 }; | |
1252 | |
1253 | |
1254 // An ObjectClosure used to support the deprecated IterateOverHeap and | |
1255 // IterateOverInstancesOfClass functions | |
1256 class IterateOverHeapObjectClosure: public ObjectClosure { | |
1257 private: | |
1258 JvmtiTagMap* _tag_map; | |
1259 KlassHandle _klass; | |
1260 jvmtiHeapObjectFilter _object_filter; | |
1261 jvmtiHeapObjectCallback _heap_object_callback; | |
1262 const void* _user_data; | |
1263 | |
1264 // accessors | |
1265 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1266 jvmtiHeapObjectFilter object_filter() const { return _object_filter; } | |
1267 jvmtiHeapObjectCallback object_callback() const { return _heap_object_callback; } | |
1268 KlassHandle klass() const { return _klass; } | |
1269 const void* user_data() const { return _user_data; } | |
1270 | |
1271 // indicates if iteration has been aborted | |
1272 bool _iteration_aborted; | |
1273 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1274 void set_iteration_aborted(bool aborted) { _iteration_aborted = aborted; } | |
1275 | |
1276 public: | |
1277 IterateOverHeapObjectClosure(JvmtiTagMap* tag_map, | |
1278 KlassHandle klass, | |
1279 jvmtiHeapObjectFilter object_filter, | |
1280 jvmtiHeapObjectCallback heap_object_callback, | |
1281 const void* user_data) : | |
1282 _tag_map(tag_map), | |
1283 _klass(klass), | |
1284 _object_filter(object_filter), | |
1285 _heap_object_callback(heap_object_callback), | |
1286 _user_data(user_data), | |
1287 _iteration_aborted(false) | |
1288 { | |
1289 } | |
1290 | |
1291 void do_object(oop o); | |
1292 }; | |
1293 | |
1294 // invoked for each object in the heap | |
1295 void IterateOverHeapObjectClosure::do_object(oop o) { | |
1296 // check if iteration has been halted | |
1297 if (is_iteration_aborted()) return; | |
1298 | |
1299 // ignore any objects that aren't visible to profiler | |
1300 if (!ServiceUtil::visible_oop(o)) return; | |
1301 | |
1302 // instanceof check when filtering by klass | |
1303 if (!klass().is_null() && !o->is_a(klass()())) { | |
1304 return; | |
1305 } | |
1306 // prepare for the calllback | |
1307 CallbackWrapper wrapper(tag_map(), o); | |
1308 | |
1309 // if the object is tagged and we're only interested in untagged objects | |
1310 // then don't invoke the callback. Similiarly, if the object is untagged | |
1311 // and we're only interested in tagged objects we skip the callback. | |
1312 if (wrapper.obj_tag() != 0) { | |
1313 if (object_filter() == JVMTI_HEAP_OBJECT_UNTAGGED) return; | |
1314 } else { | |
1315 if (object_filter() == JVMTI_HEAP_OBJECT_TAGGED) return; | |
1316 } | |
1317 | |
1318 // invoke the agent's callback | |
1319 jvmtiIterationControl control = (*object_callback())(wrapper.klass_tag(), | |
1320 wrapper.obj_size(), | |
1321 wrapper.obj_tag_p(), | |
1322 (void*)user_data()); | |
1323 if (control == JVMTI_ITERATION_ABORT) { | |
1324 set_iteration_aborted(true); | |
1325 } | |
1326 } | |
1327 | |
1328 // An ObjectClosure used to support the IterateThroughHeap function | |
1329 class IterateThroughHeapObjectClosure: public ObjectClosure { | |
1330 private: | |
1331 JvmtiTagMap* _tag_map; | |
1332 KlassHandle _klass; | |
1333 int _heap_filter; | |
1334 const jvmtiHeapCallbacks* _callbacks; | |
1335 const void* _user_data; | |
1336 | |
1337 // accessor functions | |
1338 JvmtiTagMap* tag_map() const { return _tag_map; } | |
1339 int heap_filter() const { return _heap_filter; } | |
1340 const jvmtiHeapCallbacks* callbacks() const { return _callbacks; } | |
1341 KlassHandle klass() const { return _klass; } | |
1342 const void* user_data() const { return _user_data; } | |
1343 | |
1344 // indicates if the iteration has been aborted | |
1345 bool _iteration_aborted; | |
1346 bool is_iteration_aborted() const { return _iteration_aborted; } | |
1347 | |
1348 // used to check the visit control flags. If the abort flag is set | |
1349 // then we set the iteration aborted flag so that the iteration completes | |
1350 // without processing any further objects | |
1351 bool check_flags_for_abort(jint flags) { | |
1352 bool is_abort = (flags & JVMTI_VISIT_ABORT) != 0; | |
1353 if (is_abort) { | |
1354 _iteration_aborted = true; | |
1355 } | |
1356 return is_abort; | |
1357 } | |
1358 | |
1359 public: | |
1360 IterateThroughHeapObjectClosure(JvmtiTagMap* tag_map, | |
1361 KlassHandle klass, | |
1362 int heap_filter, | |
1363 const jvmtiHeapCallbacks* heap_callbacks, | |
1364 const void* user_data) : | |
1365 _tag_map(tag_map), | |
1366 _klass(klass), | |
1367 _heap_filter(heap_filter), | |
1368 _callbacks(heap_callbacks), | |
1369 _user_data(user_data), | |
1370 _iteration_aborted(false) | |
1371 { | |
1372 } | |
1373 | |
1374 void do_object(oop o); | |
1375 }; | |
1376 | |
1377 // invoked for each object in the heap | |
1378 void IterateThroughHeapObjectClosure::do_object(oop obj) { | |
1379 // check if iteration has been halted | |
1380 if (is_iteration_aborted()) return; | |
1381 | |
1382 // ignore any objects that aren't visible to profiler | |
1383 if (!ServiceUtil::visible_oop(obj)) return; | |
1384 | |
1385 // apply class filter | |
1386 if (is_filtered_by_klass_filter(obj, klass())) return; | |
1387 | |
1388 // prepare for callback | |
1389 CallbackWrapper wrapper(tag_map(), obj); | |
1390 | |
1391 // check if filtered by the heap filter | |
1392 if (is_filtered_by_heap_filter(wrapper.obj_tag(), wrapper.klass_tag(), heap_filter())) { | |
1393 return; | |
1394 } | |
1395 | |
1396 // for arrays we need the length, otherwise -1 | |
1397 bool is_array = obj->is_array(); | |
1398 int len = is_array ? arrayOop(obj)->length() : -1; | |
1399 | |
1400 // invoke the object callback (if callback is provided) | |
1401 if (callbacks()->heap_iteration_callback != NULL) { | |
1402 jvmtiHeapIterationCallback cb = callbacks()->heap_iteration_callback; | |
1403 jint res = (*cb)(wrapper.klass_tag(), | |
1404 wrapper.obj_size(), | |
1405 wrapper.obj_tag_p(), | |
1406 (jint)len, | |
1407 (void*)user_data()); | |
1408 if (check_flags_for_abort(res)) return; | |
1409 } | |
1410 | |
1411 // for objects and classes we report primitive fields if callback provided | |
1412 if (callbacks()->primitive_field_callback != NULL && obj->is_instance()) { | |
1413 jint res; | |
1414 jvmtiPrimitiveFieldCallback cb = callbacks()->primitive_field_callback; | |
1142 | 1415 if (obj->klass() == SystemDictionary::Class_klass()) { |
0 | 1416 res = invoke_primitive_field_callback_for_static_fields(&wrapper, |
1417 obj, | |
1418 cb, | |
1419 (void*)user_data()); | |
1420 } else { | |
1421 res = invoke_primitive_field_callback_for_instance_fields(&wrapper, | |
1422 obj, | |
1423 cb, | |
1424 (void*)user_data()); | |
1425 } | |
1426 if (check_flags_for_abort(res)) return; | |
1427 } | |
1428 | |
1429 // string callback | |
1430 if (!is_array && | |
1431 callbacks()->string_primitive_value_callback != NULL && | |
1142 | 1432 obj->klass() == SystemDictionary::String_klass()) { |
0 | 1433 jint res = invoke_string_value_callback( |
1434 callbacks()->string_primitive_value_callback, | |
1435 &wrapper, | |
1436 obj, | |
1437 (void*)user_data() ); | |
1438 if (check_flags_for_abort(res)) return; | |
1439 } | |
1440 | |
1441 // array callback | |
1442 if (is_array && | |
1443 callbacks()->array_primitive_value_callback != NULL && | |
1444 obj->is_typeArray()) { | |
1445 jint res = invoke_array_primitive_value_callback( | |
1446 callbacks()->array_primitive_value_callback, | |
1447 &wrapper, | |
1448 obj, | |
1449 (void*)user_data() ); | |
1450 if (check_flags_for_abort(res)) return; | |
1451 } | |
1452 }; | |
1453 | |
1454 | |
1455 // Deprecated function to iterate over all objects in the heap | |
1456 void JvmtiTagMap::iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
1457 KlassHandle klass, | |
1458 jvmtiHeapObjectCallback heap_object_callback, | |
1459 const void* user_data) | |
1460 { | |
1461 MutexLocker ml(Heap_lock); | |
1462 IterateOverHeapObjectClosure blk(this, | |
1463 klass, | |
1464 object_filter, | |
1465 heap_object_callback, | |
1466 user_data); | |
1467 VM_HeapIterateOperation op(&blk); | |
1468 VMThread::execute(&op); | |
1469 } | |
1470 | |
1471 | |
1472 // Iterates over all objects in the heap | |
1473 void JvmtiTagMap::iterate_through_heap(jint heap_filter, | |
1474 KlassHandle klass, | |
1475 const jvmtiHeapCallbacks* callbacks, | |
1476 const void* user_data) | |
1477 { | |
1478 MutexLocker ml(Heap_lock); | |
1479 IterateThroughHeapObjectClosure blk(this, | |
1480 klass, | |
1481 heap_filter, | |
1482 callbacks, | |
1483 user_data); | |
1484 VM_HeapIterateOperation op(&blk); | |
1485 VMThread::execute(&op); | |
1486 } | |
1487 | |
1488 // support class for get_objects_with_tags | |
1489 | |
1490 class TagObjectCollector : public JvmtiTagHashmapEntryClosure { | |
1491 private: | |
1492 JvmtiEnv* _env; | |
1493 jlong* _tags; | |
1494 jint _tag_count; | |
1495 | |
1496 GrowableArray<jobject>* _object_results; // collected objects (JNI weak refs) | |
1497 GrowableArray<uint64_t>* _tag_results; // collected tags | |
1498 | |
1499 public: | |
1500 TagObjectCollector(JvmtiEnv* env, const jlong* tags, jint tag_count) { | |
1501 _env = env; | |
1502 _tags = (jlong*)tags; | |
1503 _tag_count = tag_count; | |
6197 | 1504 _object_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jobject>(1,true); |
1505 _tag_results = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<uint64_t>(1,true); | |
0 | 1506 } |
1507 | |
1508 ~TagObjectCollector() { | |
1509 delete _object_results; | |
1510 delete _tag_results; | |
1511 } | |
1512 | |
1513 // for each tagged object check if the tag value matches | |
1514 // - if it matches then we create a JNI local reference to the object | |
1515 // and record the reference and tag value. | |
1516 // | |
1517 void do_entry(JvmtiTagHashmapEntry* entry) { | |
1518 for (int i=0; i<_tag_count; i++) { | |
1519 if (_tags[i] == entry->tag()) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
1520 oop o = entry->object(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1521 assert(o != NULL && Universe::heap()->is_in_reserved(o), "sanity check"); |
0 | 1522 jobject ref = JNIHandles::make_local(JavaThread::current(), o); |
1523 _object_results->append(ref); | |
1524 _tag_results->append((uint64_t)entry->tag()); | |
1525 } | |
1526 } | |
1527 } | |
1528 | |
1529 // return the results from the collection | |
1530 // | |
1531 jvmtiError result(jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1532 jvmtiError error; | |
1533 int count = _object_results->length(); | |
1534 assert(count >= 0, "sanity check"); | |
1535 | |
1536 // if object_result_ptr is not NULL then allocate the result and copy | |
1537 // in the object references. | |
1538 if (object_result_ptr != NULL) { | |
1539 error = _env->Allocate(count * sizeof(jobject), (unsigned char**)object_result_ptr); | |
1540 if (error != JVMTI_ERROR_NONE) { | |
1541 return error; | |
1542 } | |
1543 for (int i=0; i<count; i++) { | |
1544 (*object_result_ptr)[i] = _object_results->at(i); | |
1545 } | |
1546 } | |
1547 | |
1548 // if tag_result_ptr is not NULL then allocate the result and copy | |
1549 // in the tag values. | |
1550 if (tag_result_ptr != NULL) { | |
1551 error = _env->Allocate(count * sizeof(jlong), (unsigned char**)tag_result_ptr); | |
1552 if (error != JVMTI_ERROR_NONE) { | |
1553 if (object_result_ptr != NULL) { | |
1554 _env->Deallocate((unsigned char*)object_result_ptr); | |
1555 } | |
1556 return error; | |
1557 } | |
1558 for (int i=0; i<count; i++) { | |
1559 (*tag_result_ptr)[i] = (jlong)_tag_results->at(i); | |
1560 } | |
1561 } | |
1562 | |
1563 *count_ptr = count; | |
1564 return JVMTI_ERROR_NONE; | |
1565 } | |
1566 }; | |
1567 | |
1568 // return the list of objects with the specified tags | |
1569 jvmtiError JvmtiTagMap::get_objects_with_tags(const jlong* tags, | |
1570 jint count, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { | |
1571 | |
1572 TagObjectCollector collector(env(), tags, count); | |
1573 { | |
1574 // iterate over all tagged objects | |
1575 MutexLocker ml(lock()); | |
1576 entry_iterate(&collector); | |
1577 } | |
1578 return collector.result(count_ptr, object_result_ptr, tag_result_ptr); | |
1579 } | |
1580 | |
1581 | |
1582 // ObjectMarker is used to support the marking objects when walking the | |
1583 // heap. | |
1584 // | |
1585 // This implementation uses the existing mark bits in an object for | |
1586 // marking. Objects that are marked must later have their headers restored. | |
1587 // As most objects are unlocked and don't have their identity hash computed | |
1588 // we don't have to save their headers. Instead we save the headers that | |
1589 // are "interesting". Later when the headers are restored this implementation | |
1590 // restores all headers to their initial value and then restores the few | |
1591 // objects that had interesting headers. | |
1592 // | |
1593 // Future work: This implementation currently uses growable arrays to save | |
1594 // the oop and header of interesting objects. As an optimization we could | |
1595 // use the same technique as the GC and make use of the unused area | |
1596 // between top() and end(). | |
1597 // | |
1598 | |
1599 // An ObjectClosure used to restore the mark bits of an object | |
1600 class RestoreMarksClosure : public ObjectClosure { | |
1601 public: | |
1602 void do_object(oop o) { | |
1603 if (o != NULL) { | |
1604 markOop mark = o->mark(); | |
1605 if (mark->is_marked()) { | |
1606 o->init_mark(); | |
1607 } | |
1608 } | |
1609 } | |
1610 }; | |
1611 | |
1612 // ObjectMarker provides the mark and visited functions | |
1613 class ObjectMarker : AllStatic { | |
1614 private: | |
1615 // saved headers | |
1616 static GrowableArray<oop>* _saved_oop_stack; | |
1617 static GrowableArray<markOop>* _saved_mark_stack; | |
3815 | 1618 static bool _needs_reset; // do we need to reset mark bits? |
0 | 1619 |
1620 public: | |
1621 static void init(); // initialize | |
1622 static void done(); // clean-up | |
1623 | |
1624 static inline void mark(oop o); // mark an object | |
1625 static inline bool visited(oop o); // check if object has been visited | |
3815 | 1626 |
1627 static inline bool needs_reset() { return _needs_reset; } | |
1628 static inline void set_needs_reset(bool v) { _needs_reset = v; } | |
0 | 1629 }; |
1630 | |
1631 GrowableArray<oop>* ObjectMarker::_saved_oop_stack = NULL; | |
1632 GrowableArray<markOop>* ObjectMarker::_saved_mark_stack = NULL; | |
3815 | 1633 bool ObjectMarker::_needs_reset = true; // need to reset mark bits by default |
0 | 1634 |
1635 // initialize ObjectMarker - prepares for object marking | |
1636 void ObjectMarker::init() { | |
1637 assert(Thread::current()->is_VM_thread(), "must be VMThread"); | |
1638 | |
1639 // prepare heap for iteration | |
1640 Universe::heap()->ensure_parsability(false); // no need to retire TLABs | |
1641 | |
1642 // create stacks for interesting headers | |
6197 | 1643 _saved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markOop>(4000, true); |
1644 _saved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(4000, true); | |
0 | 1645 |
1646 if (UseBiasedLocking) { | |
1647 BiasedLocking::preserve_marks(); | |
1648 } | |
1649 } | |
1650 | |
1651 // Object marking is done so restore object headers | |
1652 void ObjectMarker::done() { | |
1653 // iterate over all objects and restore the mark bits to | |
1654 // their initial value | |
1655 RestoreMarksClosure blk; | |
3815 | 1656 if (needs_reset()) { |
1657 Universe::heap()->object_iterate(&blk); | |
1658 } else { | |
1659 // We don't need to reset mark bits on this call, but reset the | |
1660 // flag to the default for the next call. | |
1661 set_needs_reset(true); | |
1662 } | |
0 | 1663 |
1664 // now restore the interesting headers | |
1665 for (int i = 0; i < _saved_oop_stack->length(); i++) { | |
1666 oop o = _saved_oop_stack->at(i); | |
1667 markOop mark = _saved_mark_stack->at(i); | |
1668 o->set_mark(mark); | |
1669 } | |
1670 | |
1671 if (UseBiasedLocking) { | |
1672 BiasedLocking::restore_marks(); | |
1673 } | |
1674 | |
1675 // free the stacks | |
1676 delete _saved_oop_stack; | |
1677 delete _saved_mark_stack; | |
1678 } | |
1679 | |
1680 // mark an object | |
1681 inline void ObjectMarker::mark(oop o) { | |
1682 assert(Universe::heap()->is_in(o), "sanity check"); | |
1683 assert(!o->mark()->is_marked(), "should only mark an object once"); | |
1684 | |
1685 // object's mark word | |
1686 markOop mark = o->mark(); | |
1687 | |
1688 if (mark->must_be_preserved(o)) { | |
1689 _saved_mark_stack->push(mark); | |
1690 _saved_oop_stack->push(o); | |
1691 } | |
1692 | |
1693 // mark the object | |
1694 o->set_mark(markOopDesc::prototype()->set_marked()); | |
1695 } | |
1696 | |
1697 // return true if object is marked | |
1698 inline bool ObjectMarker::visited(oop o) { | |
1699 return o->mark()->is_marked(); | |
1700 } | |
1701 | |
1702 // Stack allocated class to help ensure that ObjectMarker is used | |
1703 // correctly. Constructor initializes ObjectMarker, destructor calls | |
1704 // ObjectMarker's done() function to restore object headers. | |
1705 class ObjectMarkerController : public StackObj { | |
1706 public: | |
1707 ObjectMarkerController() { | |
1708 ObjectMarker::init(); | |
1709 } | |
1710 ~ObjectMarkerController() { | |
1711 ObjectMarker::done(); | |
1712 } | |
1713 }; | |
1714 | |
1715 | |
1716 // helper to map a jvmtiHeapReferenceKind to an old style jvmtiHeapRootKind | |
1717 // (not performance critical as only used for roots) | |
1718 static jvmtiHeapRootKind toJvmtiHeapRootKind(jvmtiHeapReferenceKind kind) { | |
1719 switch (kind) { | |
1720 case JVMTI_HEAP_REFERENCE_JNI_GLOBAL: return JVMTI_HEAP_ROOT_JNI_GLOBAL; | |
1721 case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS: return JVMTI_HEAP_ROOT_SYSTEM_CLASS; | |
1722 case JVMTI_HEAP_REFERENCE_MONITOR: return JVMTI_HEAP_ROOT_MONITOR; | |
1723 case JVMTI_HEAP_REFERENCE_STACK_LOCAL: return JVMTI_HEAP_ROOT_STACK_LOCAL; | |
1724 case JVMTI_HEAP_REFERENCE_JNI_LOCAL: return JVMTI_HEAP_ROOT_JNI_LOCAL; | |
1725 case JVMTI_HEAP_REFERENCE_THREAD: return JVMTI_HEAP_ROOT_THREAD; | |
1726 case JVMTI_HEAP_REFERENCE_OTHER: return JVMTI_HEAP_ROOT_OTHER; | |
1727 default: ShouldNotReachHere(); return JVMTI_HEAP_ROOT_OTHER; | |
1728 } | |
1729 } | |
1730 | |
1731 // Base class for all heap walk contexts. The base class maintains a flag | |
1732 // to indicate if the context is valid or not. | |
1733 class HeapWalkContext VALUE_OBJ_CLASS_SPEC { | |
1734 private: | |
1735 bool _valid; | |
1736 public: | |
1737 HeapWalkContext(bool valid) { _valid = valid; } | |
1738 void invalidate() { _valid = false; } | |
1739 bool is_valid() const { return _valid; } | |
1740 }; | |
1741 | |
1742 // A basic heap walk context for the deprecated heap walking functions. | |
1743 // The context for a basic heap walk are the callbacks and fields used by | |
1744 // the referrer caching scheme. | |
1745 class BasicHeapWalkContext: public HeapWalkContext { | |
1746 private: | |
1747 jvmtiHeapRootCallback _heap_root_callback; | |
1748 jvmtiStackReferenceCallback _stack_ref_callback; | |
1749 jvmtiObjectReferenceCallback _object_ref_callback; | |
1750 | |
1751 // used for caching | |
1752 oop _last_referrer; | |
1753 jlong _last_referrer_tag; | |
1754 | |
1755 public: | |
1756 BasicHeapWalkContext() : HeapWalkContext(false) { } | |
1757 | |
1758 BasicHeapWalkContext(jvmtiHeapRootCallback heap_root_callback, | |
1759 jvmtiStackReferenceCallback stack_ref_callback, | |
1760 jvmtiObjectReferenceCallback object_ref_callback) : | |
1761 HeapWalkContext(true), | |
1762 _heap_root_callback(heap_root_callback), | |
1763 _stack_ref_callback(stack_ref_callback), | |
1764 _object_ref_callback(object_ref_callback), | |
1765 _last_referrer(NULL), | |
1766 _last_referrer_tag(0) { | |
1767 } | |
1768 | |
1769 // accessors | |
1770 jvmtiHeapRootCallback heap_root_callback() const { return _heap_root_callback; } | |
1771 jvmtiStackReferenceCallback stack_ref_callback() const { return _stack_ref_callback; } | |
1772 jvmtiObjectReferenceCallback object_ref_callback() const { return _object_ref_callback; } | |
1773 | |
1774 oop last_referrer() const { return _last_referrer; } | |
1775 void set_last_referrer(oop referrer) { _last_referrer = referrer; } | |
1776 jlong last_referrer_tag() const { return _last_referrer_tag; } | |
1777 void set_last_referrer_tag(jlong value) { _last_referrer_tag = value; } | |
1778 }; | |
1779 | |
1780 // The advanced heap walk context for the FollowReferences functions. | |
1781 // The context is the callbacks, and the fields used for filtering. | |
1782 class AdvancedHeapWalkContext: public HeapWalkContext { | |
1783 private: | |
1784 jint _heap_filter; | |
1785 KlassHandle _klass_filter; | |
1786 const jvmtiHeapCallbacks* _heap_callbacks; | |
1787 | |
1788 public: | |
1789 AdvancedHeapWalkContext() : HeapWalkContext(false) { } | |
1790 | |
1791 AdvancedHeapWalkContext(jint heap_filter, | |
1792 KlassHandle klass_filter, | |
1793 const jvmtiHeapCallbacks* heap_callbacks) : | |
1794 HeapWalkContext(true), | |
1795 _heap_filter(heap_filter), | |
1796 _klass_filter(klass_filter), | |
1797 _heap_callbacks(heap_callbacks) { | |
1798 } | |
1799 | |
1800 // accessors | |
1801 jint heap_filter() const { return _heap_filter; } | |
1802 KlassHandle klass_filter() const { return _klass_filter; } | |
1803 | |
1804 const jvmtiHeapReferenceCallback heap_reference_callback() const { | |
1805 return _heap_callbacks->heap_reference_callback; | |
1806 }; | |
1807 const jvmtiPrimitiveFieldCallback primitive_field_callback() const { | |
1808 return _heap_callbacks->primitive_field_callback; | |
1809 } | |
1810 const jvmtiArrayPrimitiveValueCallback array_primitive_value_callback() const { | |
1811 return _heap_callbacks->array_primitive_value_callback; | |
1812 } | |
1813 const jvmtiStringPrimitiveValueCallback string_primitive_value_callback() const { | |
1814 return _heap_callbacks->string_primitive_value_callback; | |
1815 } | |
1816 }; | |
1817 | |
1818 // The CallbackInvoker is a class with static functions that the heap walk can call | |
1819 // into to invoke callbacks. It works in one of two modes. The "basic" mode is | |
1820 // used for the deprecated IterateOverReachableObjects functions. The "advanced" | |
1821 // mode is for the newer FollowReferences function which supports a lot of | |
1822 // additional callbacks. | |
1823 class CallbackInvoker : AllStatic { | |
1824 private: | |
1825 // heap walk styles | |
1826 enum { basic, advanced }; | |
1827 static int _heap_walk_type; | |
1828 static bool is_basic_heap_walk() { return _heap_walk_type == basic; } | |
1829 static bool is_advanced_heap_walk() { return _heap_walk_type == advanced; } | |
1830 | |
1831 // context for basic style heap walk | |
1832 static BasicHeapWalkContext _basic_context; | |
1833 static BasicHeapWalkContext* basic_context() { | |
1834 assert(_basic_context.is_valid(), "invalid"); | |
1835 return &_basic_context; | |
1836 } | |
1837 | |
1838 // context for advanced style heap walk | |
1839 static AdvancedHeapWalkContext _advanced_context; | |
1840 static AdvancedHeapWalkContext* advanced_context() { | |
1841 assert(_advanced_context.is_valid(), "invalid"); | |
1842 return &_advanced_context; | |
1843 } | |
1844 | |
1845 // context needed for all heap walks | |
1846 static JvmtiTagMap* _tag_map; | |
1847 static const void* _user_data; | |
1848 static GrowableArray<oop>* _visit_stack; | |
1849 | |
1850 // accessors | |
1851 static JvmtiTagMap* tag_map() { return _tag_map; } | |
1852 static const void* user_data() { return _user_data; } | |
1853 static GrowableArray<oop>* visit_stack() { return _visit_stack; } | |
1854 | |
1855 // if the object hasn't been visited then push it onto the visit stack | |
1856 // so that it will be visited later | |
1857 static inline bool check_for_visit(oop obj) { | |
1858 if (!ObjectMarker::visited(obj)) visit_stack()->push(obj); | |
1859 return true; | |
1860 } | |
1861 | |
1862 // invoke basic style callbacks | |
1863 static inline bool invoke_basic_heap_root_callback | |
1864 (jvmtiHeapRootKind root_kind, oop obj); | |
1865 static inline bool invoke_basic_stack_ref_callback | |
1866 (jvmtiHeapRootKind root_kind, jlong thread_tag, jint depth, jmethodID method, | |
1867 int slot, oop obj); | |
1868 static inline bool invoke_basic_object_reference_callback | |
1869 (jvmtiObjectReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1870 | |
1871 // invoke advanced style callbacks | |
1872 static inline bool invoke_advanced_heap_root_callback | |
1873 (jvmtiHeapReferenceKind ref_kind, oop obj); | |
1874 static inline bool invoke_advanced_stack_ref_callback | |
1875 (jvmtiHeapReferenceKind ref_kind, jlong thread_tag, jlong tid, int depth, | |
1876 jmethodID method, jlocation bci, jint slot, oop obj); | |
1877 static inline bool invoke_advanced_object_reference_callback | |
1878 (jvmtiHeapReferenceKind ref_kind, oop referrer, oop referree, jint index); | |
1879 | |
1880 // used to report the value of primitive fields | |
1881 static inline bool report_primitive_field | |
1882 (jvmtiHeapReferenceKind ref_kind, oop obj, jint index, address addr, char type); | |
1883 | |
1884 public: | |
1885 // initialize for basic mode | |
1886 static void initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1887 GrowableArray<oop>* visit_stack, | |
1888 const void* user_data, | |
1889 BasicHeapWalkContext context); | |
1890 | |
1891 // initialize for advanced mode | |
1892 static void initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1893 GrowableArray<oop>* visit_stack, | |
1894 const void* user_data, | |
1895 AdvancedHeapWalkContext context); | |
1896 | |
1897 // functions to report roots | |
1898 static inline bool report_simple_root(jvmtiHeapReferenceKind kind, oop o); | |
1899 static inline bool report_jni_local_root(jlong thread_tag, jlong tid, jint depth, | |
1900 jmethodID m, oop o); | |
1901 static inline bool report_stack_ref_root(jlong thread_tag, jlong tid, jint depth, | |
1902 jmethodID method, jlocation bci, jint slot, oop o); | |
1903 | |
1904 // functions to report references | |
1905 static inline bool report_array_element_reference(oop referrer, oop referree, jint index); | |
1906 static inline bool report_class_reference(oop referrer, oop referree); | |
1907 static inline bool report_class_loader_reference(oop referrer, oop referree); | |
1908 static inline bool report_signers_reference(oop referrer, oop referree); | |
1909 static inline bool report_protection_domain_reference(oop referrer, oop referree); | |
1910 static inline bool report_superclass_reference(oop referrer, oop referree); | |
1911 static inline bool report_interface_reference(oop referrer, oop referree); | |
1912 static inline bool report_static_field_reference(oop referrer, oop referree, jint slot); | |
1913 static inline bool report_field_reference(oop referrer, oop referree, jint slot); | |
1914 static inline bool report_constant_pool_reference(oop referrer, oop referree, jint index); | |
1915 static inline bool report_primitive_array_values(oop array); | |
1916 static inline bool report_string_value(oop str); | |
1917 static inline bool report_primitive_instance_field(oop o, jint index, address value, char type); | |
1918 static inline bool report_primitive_static_field(oop o, jint index, address value, char type); | |
1919 }; | |
1920 | |
1921 // statics | |
1922 int CallbackInvoker::_heap_walk_type; | |
1923 BasicHeapWalkContext CallbackInvoker::_basic_context; | |
1924 AdvancedHeapWalkContext CallbackInvoker::_advanced_context; | |
1925 JvmtiTagMap* CallbackInvoker::_tag_map; | |
1926 const void* CallbackInvoker::_user_data; | |
1927 GrowableArray<oop>* CallbackInvoker::_visit_stack; | |
1928 | |
1929 // initialize for basic heap walk (IterateOverReachableObjects et al) | |
1930 void CallbackInvoker::initialize_for_basic_heap_walk(JvmtiTagMap* tag_map, | |
1931 GrowableArray<oop>* visit_stack, | |
1932 const void* user_data, | |
1933 BasicHeapWalkContext context) { | |
1934 _tag_map = tag_map; | |
1935 _visit_stack = visit_stack; | |
1936 _user_data = user_data; | |
1937 _basic_context = context; | |
1938 _advanced_context.invalidate(); // will trigger assertion if used | |
1939 _heap_walk_type = basic; | |
1940 } | |
1941 | |
1942 // initialize for advanced heap walk (FollowReferences) | |
1943 void CallbackInvoker::initialize_for_advanced_heap_walk(JvmtiTagMap* tag_map, | |
1944 GrowableArray<oop>* visit_stack, | |
1945 const void* user_data, | |
1946 AdvancedHeapWalkContext context) { | |
1947 _tag_map = tag_map; | |
1948 _visit_stack = visit_stack; | |
1949 _user_data = user_data; | |
1950 _advanced_context = context; | |
1951 _basic_context.invalidate(); // will trigger assertion if used | |
1952 _heap_walk_type = advanced; | |
1953 } | |
1954 | |
1955 | |
1956 // invoke basic style heap root callback | |
1957 inline bool CallbackInvoker::invoke_basic_heap_root_callback(jvmtiHeapRootKind root_kind, oop obj) { | |
1958 assert(ServiceUtil::visible_oop(obj), "checking"); | |
1959 | |
1960 // if we heap roots should be reported | |
1961 jvmtiHeapRootCallback cb = basic_context()->heap_root_callback(); | |
1962 if (cb == NULL) { | |
1963 return check_for_visit(obj); | |
1964 } | |
1965 | |
1966 CallbackWrapper wrapper(tag_map(), obj); | |
1967 jvmtiIterationControl control = (*cb)(root_kind, | |
1968 wrapper.klass_tag(), | |
1969 wrapper.obj_size(), | |
1970 wrapper.obj_tag_p(), | |
1971 (void*)user_data()); | |
1972 // push root to visit stack when following references | |
1973 if (control == JVMTI_ITERATION_CONTINUE && | |
1974 basic_context()->object_ref_callback() != NULL) { | |
1975 visit_stack()->push(obj); | |
1976 } | |
1977 return control != JVMTI_ITERATION_ABORT; | |
1978 } | |
1979 | |
1980 // invoke basic style stack ref callback | |
1981 inline bool CallbackInvoker::invoke_basic_stack_ref_callback(jvmtiHeapRootKind root_kind, | |
1982 jlong thread_tag, | |
1983 jint depth, | |
1984 jmethodID method, | |
1985 jint slot, | |
1986 oop obj) { | |
1987 assert(ServiceUtil::visible_oop(obj), "checking"); | |
1988 | |
1989 // if we stack refs should be reported | |
1990 jvmtiStackReferenceCallback cb = basic_context()->stack_ref_callback(); | |
1991 if (cb == NULL) { | |
1992 return check_for_visit(obj); | |
1993 } | |
1994 | |
1995 CallbackWrapper wrapper(tag_map(), obj); | |
1996 jvmtiIterationControl control = (*cb)(root_kind, | |
1997 wrapper.klass_tag(), | |
1998 wrapper.obj_size(), | |
1999 wrapper.obj_tag_p(), | |
2000 thread_tag, | |
2001 depth, | |
2002 method, | |
2003 slot, | |
2004 (void*)user_data()); | |
2005 // push root to visit stack when following references | |
2006 if (control == JVMTI_ITERATION_CONTINUE && | |
2007 basic_context()->object_ref_callback() != NULL) { | |
2008 visit_stack()->push(obj); | |
2009 } | |
2010 return control != JVMTI_ITERATION_ABORT; | |
2011 } | |
2012 | |
2013 // invoke basic style object reference callback | |
2014 inline bool CallbackInvoker::invoke_basic_object_reference_callback(jvmtiObjectReferenceKind ref_kind, | |
2015 oop referrer, | |
2016 oop referree, | |
2017 jint index) { | |
2018 | |
2019 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2020 assert(ServiceUtil::visible_oop(referree), "checking"); | |
2021 | |
2022 BasicHeapWalkContext* context = basic_context(); | |
2023 | |
2024 // callback requires the referrer's tag. If it's the same referrer | |
2025 // as the last call then we use the cached value. | |
2026 jlong referrer_tag; | |
2027 if (referrer == context->last_referrer()) { | |
2028 referrer_tag = context->last_referrer_tag(); | |
2029 } else { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2030 referrer_tag = tag_for(tag_map(), referrer); |
0 | 2031 } |
2032 | |
2033 // do the callback | |
2034 CallbackWrapper wrapper(tag_map(), referree); | |
2035 jvmtiObjectReferenceCallback cb = context->object_ref_callback(); | |
2036 jvmtiIterationControl control = (*cb)(ref_kind, | |
2037 wrapper.klass_tag(), | |
2038 wrapper.obj_size(), | |
2039 wrapper.obj_tag_p(), | |
2040 referrer_tag, | |
2041 index, | |
2042 (void*)user_data()); | |
2043 | |
2044 // record referrer and referrer tag. For self-references record the | |
2045 // tag value from the callback as this might differ from referrer_tag. | |
2046 context->set_last_referrer(referrer); | |
2047 if (referrer == referree) { | |
2048 context->set_last_referrer_tag(*wrapper.obj_tag_p()); | |
2049 } else { | |
2050 context->set_last_referrer_tag(referrer_tag); | |
2051 } | |
2052 | |
2053 if (control == JVMTI_ITERATION_CONTINUE) { | |
2054 return check_for_visit(referree); | |
2055 } else { | |
2056 return control != JVMTI_ITERATION_ABORT; | |
2057 } | |
2058 } | |
2059 | |
2060 // invoke advanced style heap root callback | |
2061 inline bool CallbackInvoker::invoke_advanced_heap_root_callback(jvmtiHeapReferenceKind ref_kind, | |
2062 oop obj) { | |
2063 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2064 | |
2065 AdvancedHeapWalkContext* context = advanced_context(); | |
2066 | |
2067 // check that callback is provided | |
2068 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2069 if (cb == NULL) { | |
2070 return check_for_visit(obj); | |
2071 } | |
2072 | |
2073 // apply class filter | |
2074 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2075 return check_for_visit(obj); | |
2076 } | |
2077 | |
2078 // setup the callback wrapper | |
2079 CallbackWrapper wrapper(tag_map(), obj); | |
2080 | |
2081 // apply tag filter | |
2082 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2083 wrapper.klass_tag(), | |
2084 context->heap_filter())) { | |
2085 return check_for_visit(obj); | |
2086 } | |
2087 | |
2088 // for arrays we need the length, otherwise -1 | |
2089 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2090 | |
2091 // invoke the callback | |
2092 jint res = (*cb)(ref_kind, | |
2093 NULL, // referrer info | |
2094 wrapper.klass_tag(), | |
2095 0, // referrer_class_tag is 0 for heap root | |
2096 wrapper.obj_size(), | |
2097 wrapper.obj_tag_p(), | |
2098 NULL, // referrer_tag_p | |
2099 len, | |
2100 (void*)user_data()); | |
2101 if (res & JVMTI_VISIT_ABORT) { | |
2102 return false;// referrer class tag | |
2103 } | |
2104 if (res & JVMTI_VISIT_OBJECTS) { | |
2105 check_for_visit(obj); | |
2106 } | |
2107 return true; | |
2108 } | |
2109 | |
2110 // report a reference from a thread stack to an object | |
2111 inline bool CallbackInvoker::invoke_advanced_stack_ref_callback(jvmtiHeapReferenceKind ref_kind, | |
2112 jlong thread_tag, | |
2113 jlong tid, | |
2114 int depth, | |
2115 jmethodID method, | |
2116 jlocation bci, | |
2117 jint slot, | |
2118 oop obj) { | |
2119 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2120 | |
2121 AdvancedHeapWalkContext* context = advanced_context(); | |
2122 | |
2123 // check that callback is provider | |
2124 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2125 if (cb == NULL) { | |
2126 return check_for_visit(obj); | |
2127 } | |
2128 | |
2129 // apply class filter | |
2130 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2131 return check_for_visit(obj); | |
2132 } | |
2133 | |
2134 // setup the callback wrapper | |
2135 CallbackWrapper wrapper(tag_map(), obj); | |
2136 | |
2137 // apply tag filter | |
2138 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2139 wrapper.klass_tag(), | |
2140 context->heap_filter())) { | |
2141 return check_for_visit(obj); | |
2142 } | |
2143 | |
2144 // setup the referrer info | |
2145 jvmtiHeapReferenceInfo reference_info; | |
2146 reference_info.stack_local.thread_tag = thread_tag; | |
2147 reference_info.stack_local.thread_id = tid; | |
2148 reference_info.stack_local.depth = depth; | |
2149 reference_info.stack_local.method = method; | |
2150 reference_info.stack_local.location = bci; | |
2151 reference_info.stack_local.slot = slot; | |
2152 | |
2153 // for arrays we need the length, otherwise -1 | |
2154 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2155 | |
2156 // call into the agent | |
2157 int res = (*cb)(ref_kind, | |
2158 &reference_info, | |
2159 wrapper.klass_tag(), | |
2160 0, // referrer_class_tag is 0 for heap root (stack) | |
2161 wrapper.obj_size(), | |
2162 wrapper.obj_tag_p(), | |
2163 NULL, // referrer_tag is 0 for root | |
2164 len, | |
2165 (void*)user_data()); | |
2166 | |
2167 if (res & JVMTI_VISIT_ABORT) { | |
2168 return false; | |
2169 } | |
2170 if (res & JVMTI_VISIT_OBJECTS) { | |
2171 check_for_visit(obj); | |
2172 } | |
2173 return true; | |
2174 } | |
2175 | |
2176 // This mask is used to pass reference_info to a jvmtiHeapReferenceCallback | |
2177 // only for ref_kinds defined by the JVM TI spec. Otherwise, NULL is passed. | |
2178 #define REF_INFO_MASK ((1 << JVMTI_HEAP_REFERENCE_FIELD) \ | |
2179 | (1 << JVMTI_HEAP_REFERENCE_STATIC_FIELD) \ | |
2180 | (1 << JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT) \ | |
2181 | (1 << JVMTI_HEAP_REFERENCE_CONSTANT_POOL) \ | |
2182 | (1 << JVMTI_HEAP_REFERENCE_STACK_LOCAL) \ | |
2183 | (1 << JVMTI_HEAP_REFERENCE_JNI_LOCAL)) | |
2184 | |
2185 // invoke the object reference callback to report a reference | |
2186 inline bool CallbackInvoker::invoke_advanced_object_reference_callback(jvmtiHeapReferenceKind ref_kind, | |
2187 oop referrer, | |
2188 oop obj, | |
2189 jint index) | |
2190 { | |
2191 // field index is only valid field in reference_info | |
2192 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2193 | |
2194 assert(ServiceUtil::visible_oop(referrer), "checking"); | |
2195 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2196 | |
2197 AdvancedHeapWalkContext* context = advanced_context(); | |
2198 | |
2199 // check that callback is provider | |
2200 jvmtiHeapReferenceCallback cb = context->heap_reference_callback(); | |
2201 if (cb == NULL) { | |
2202 return check_for_visit(obj); | |
2203 } | |
2204 | |
2205 // apply class filter | |
2206 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2207 return check_for_visit(obj); | |
2208 } | |
2209 | |
2210 // setup the callback wrapper | |
2211 TwoOopCallbackWrapper wrapper(tag_map(), referrer, obj); | |
2212 | |
2213 // apply tag filter | |
2214 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2215 wrapper.klass_tag(), | |
2216 context->heap_filter())) { | |
2217 return check_for_visit(obj); | |
2218 } | |
2219 | |
2220 // field index is only valid field in reference_info | |
2221 reference_info.field.index = index; | |
2222 | |
2223 // for arrays we need the length, otherwise -1 | |
2224 jint len = (jint)(obj->is_array() ? arrayOop(obj)->length() : -1); | |
2225 | |
2226 // invoke the callback | |
2227 int res = (*cb)(ref_kind, | |
2228 (REF_INFO_MASK & (1 << ref_kind)) ? &reference_info : NULL, | |
2229 wrapper.klass_tag(), | |
2230 wrapper.referrer_klass_tag(), | |
2231 wrapper.obj_size(), | |
2232 wrapper.obj_tag_p(), | |
2233 wrapper.referrer_tag_p(), | |
2234 len, | |
2235 (void*)user_data()); | |
2236 | |
2237 if (res & JVMTI_VISIT_ABORT) { | |
2238 return false; | |
2239 } | |
2240 if (res & JVMTI_VISIT_OBJECTS) { | |
2241 check_for_visit(obj); | |
2242 } | |
2243 return true; | |
2244 } | |
2245 | |
2246 // report a "simple root" | |
2247 inline bool CallbackInvoker::report_simple_root(jvmtiHeapReferenceKind kind, oop obj) { | |
2248 assert(kind != JVMTI_HEAP_REFERENCE_STACK_LOCAL && | |
2249 kind != JVMTI_HEAP_REFERENCE_JNI_LOCAL, "not a simple root"); | |
2250 assert(ServiceUtil::visible_oop(obj), "checking"); | |
2251 | |
2252 if (is_basic_heap_walk()) { | |
2253 // map to old style root kind | |
2254 jvmtiHeapRootKind root_kind = toJvmtiHeapRootKind(kind); | |
2255 return invoke_basic_heap_root_callback(root_kind, obj); | |
2256 } else { | |
2257 assert(is_advanced_heap_walk(), "wrong heap walk type"); | |
2258 return invoke_advanced_heap_root_callback(kind, obj); | |
2259 } | |
2260 } | |
2261 | |
2262 | |
2263 // invoke the primitive array values | |
2264 inline bool CallbackInvoker::report_primitive_array_values(oop obj) { | |
2265 assert(obj->is_typeArray(), "not a primitive array"); | |
2266 | |
2267 AdvancedHeapWalkContext* context = advanced_context(); | |
2268 assert(context->array_primitive_value_callback() != NULL, "no callback"); | |
2269 | |
2270 // apply class filter | |
2271 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2272 return true; | |
2273 } | |
2274 | |
2275 CallbackWrapper wrapper(tag_map(), obj); | |
2276 | |
2277 // apply tag filter | |
2278 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2279 wrapper.klass_tag(), | |
2280 context->heap_filter())) { | |
2281 return true; | |
2282 } | |
2283 | |
2284 // invoke the callback | |
2285 int res = invoke_array_primitive_value_callback(context->array_primitive_value_callback(), | |
2286 &wrapper, | |
2287 obj, | |
2288 (void*)user_data()); | |
2289 return (!(res & JVMTI_VISIT_ABORT)); | |
2290 } | |
2291 | |
2292 // invoke the string value callback | |
2293 inline bool CallbackInvoker::report_string_value(oop str) { | |
1142 | 2294 assert(str->klass() == SystemDictionary::String_klass(), "not a string"); |
0 | 2295 |
2296 AdvancedHeapWalkContext* context = advanced_context(); | |
2297 assert(context->string_primitive_value_callback() != NULL, "no callback"); | |
2298 | |
2299 // apply class filter | |
2300 if (is_filtered_by_klass_filter(str, context->klass_filter())) { | |
2301 return true; | |
2302 } | |
2303 | |
2304 CallbackWrapper wrapper(tag_map(), str); | |
2305 | |
2306 // apply tag filter | |
2307 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2308 wrapper.klass_tag(), | |
2309 context->heap_filter())) { | |
2310 return true; | |
2311 } | |
2312 | |
2313 // invoke the callback | |
2314 int res = invoke_string_value_callback(context->string_primitive_value_callback(), | |
2315 &wrapper, | |
2316 str, | |
2317 (void*)user_data()); | |
2318 return (!(res & JVMTI_VISIT_ABORT)); | |
2319 } | |
2320 | |
2321 // invoke the primitive field callback | |
2322 inline bool CallbackInvoker::report_primitive_field(jvmtiHeapReferenceKind ref_kind, | |
2323 oop obj, | |
2324 jint index, | |
2325 address addr, | |
2326 char type) | |
2327 { | |
2328 // for primitive fields only the index will be set | |
2329 static jvmtiHeapReferenceInfo reference_info = { 0 }; | |
2330 | |
2331 AdvancedHeapWalkContext* context = advanced_context(); | |
2332 assert(context->primitive_field_callback() != NULL, "no callback"); | |
2333 | |
2334 // apply class filter | |
2335 if (is_filtered_by_klass_filter(obj, context->klass_filter())) { | |
2336 return true; | |
2337 } | |
2338 | |
2339 CallbackWrapper wrapper(tag_map(), obj); | |
2340 | |
2341 // apply tag filter | |
2342 if (is_filtered_by_heap_filter(wrapper.obj_tag(), | |
2343 wrapper.klass_tag(), | |
2344 context->heap_filter())) { | |
2345 return true; | |
2346 } | |
2347 | |
2348 // the field index in the referrer | |
2349 reference_info.field.index = index; | |
2350 | |
2351 // map the type | |
2352 jvmtiPrimitiveType value_type = (jvmtiPrimitiveType)type; | |
2353 | |
2354 // setup the jvalue | |
2355 jvalue value; | |
2356 copy_to_jvalue(&value, addr, value_type); | |
2357 | |
2358 jvmtiPrimitiveFieldCallback cb = context->primitive_field_callback(); | |
2359 int res = (*cb)(ref_kind, | |
2360 &reference_info, | |
2361 wrapper.klass_tag(), | |
2362 wrapper.obj_tag_p(), | |
2363 value, | |
2364 value_type, | |
2365 (void*)user_data()); | |
2366 return (!(res & JVMTI_VISIT_ABORT)); | |
2367 } | |
2368 | |
2369 | |
2370 // instance field | |
2371 inline bool CallbackInvoker::report_primitive_instance_field(oop obj, | |
2372 jint index, | |
2373 address value, | |
2374 char type) { | |
2375 return report_primitive_field(JVMTI_HEAP_REFERENCE_FIELD, | |
2376 obj, | |
2377 index, | |
2378 value, | |
2379 type); | |
2380 } | |
2381 | |
2382 // static field | |
2383 inline bool CallbackInvoker::report_primitive_static_field(oop obj, | |
2384 jint index, | |
2385 address value, | |
2386 char type) { | |
2387 return report_primitive_field(JVMTI_HEAP_REFERENCE_STATIC_FIELD, | |
2388 obj, | |
2389 index, | |
2390 value, | |
2391 type); | |
2392 } | |
2393 | |
2394 // report a JNI local (root object) to the profiler | |
2395 inline bool CallbackInvoker::report_jni_local_root(jlong thread_tag, jlong tid, jint depth, jmethodID m, oop obj) { | |
2396 if (is_basic_heap_walk()) { | |
2397 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_JNI_LOCAL, | |
2398 thread_tag, | |
2399 depth, | |
2400 m, | |
2401 -1, | |
2402 obj); | |
2403 } else { | |
2404 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_JNI_LOCAL, | |
2405 thread_tag, tid, | |
2406 depth, | |
2407 m, | |
2408 (jlocation)-1, | |
2409 -1, | |
2410 obj); | |
2411 } | |
2412 } | |
2413 | |
2414 | |
2415 // report a local (stack reference, root object) | |
2416 inline bool CallbackInvoker::report_stack_ref_root(jlong thread_tag, | |
2417 jlong tid, | |
2418 jint depth, | |
2419 jmethodID method, | |
2420 jlocation bci, | |
2421 jint slot, | |
2422 oop obj) { | |
2423 if (is_basic_heap_walk()) { | |
2424 return invoke_basic_stack_ref_callback(JVMTI_HEAP_ROOT_STACK_LOCAL, | |
2425 thread_tag, | |
2426 depth, | |
2427 method, | |
2428 slot, | |
2429 obj); | |
2430 } else { | |
2431 return invoke_advanced_stack_ref_callback(JVMTI_HEAP_REFERENCE_STACK_LOCAL, | |
2432 thread_tag, | |
2433 tid, | |
2434 depth, | |
2435 method, | |
2436 bci, | |
2437 slot, | |
2438 obj); | |
2439 } | |
2440 } | |
2441 | |
2442 // report an object referencing a class. | |
2443 inline bool CallbackInvoker::report_class_reference(oop referrer, oop referree) { | |
2444 if (is_basic_heap_walk()) { | |
2445 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2446 } else { | |
2447 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS, referrer, referree, -1); | |
2448 } | |
2449 } | |
2450 | |
2451 // report a class referencing its class loader. | |
2452 inline bool CallbackInvoker::report_class_loader_reference(oop referrer, oop referree) { | |
2453 if (is_basic_heap_walk()) { | |
2454 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2455 } else { | |
2456 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CLASS_LOADER, referrer, referree, -1); | |
2457 } | |
2458 } | |
2459 | |
2460 // report a class referencing its signers. | |
2461 inline bool CallbackInvoker::report_signers_reference(oop referrer, oop referree) { | |
2462 if (is_basic_heap_walk()) { | |
2463 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_SIGNERS, referrer, referree, -1); | |
2464 } else { | |
2465 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SIGNERS, referrer, referree, -1); | |
2466 } | |
2467 } | |
2468 | |
2469 // report a class referencing its protection domain.. | |
2470 inline bool CallbackInvoker::report_protection_domain_reference(oop referrer, oop referree) { | |
2471 if (is_basic_heap_walk()) { | |
2472 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2473 } else { | |
2474 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_PROTECTION_DOMAIN, referrer, referree, -1); | |
2475 } | |
2476 } | |
2477 | |
2478 // report a class referencing its superclass. | |
2479 inline bool CallbackInvoker::report_superclass_reference(oop referrer, oop referree) { | |
2480 if (is_basic_heap_walk()) { | |
2481 // Send this to be consistent with past implementation | |
2482 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CLASS, referrer, referree, -1); | |
2483 } else { | |
2484 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_SUPERCLASS, referrer, referree, -1); | |
2485 } | |
2486 } | |
2487 | |
2488 // report a class referencing one of its interfaces. | |
2489 inline bool CallbackInvoker::report_interface_reference(oop referrer, oop referree) { | |
2490 if (is_basic_heap_walk()) { | |
2491 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_INTERFACE, referrer, referree, -1); | |
2492 } else { | |
2493 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_INTERFACE, referrer, referree, -1); | |
2494 } | |
2495 } | |
2496 | |
2497 // report a class referencing one of its static fields. | |
2498 inline bool CallbackInvoker::report_static_field_reference(oop referrer, oop referree, jint slot) { | |
2499 if (is_basic_heap_walk()) { | |
2500 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2501 } else { | |
2502 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_STATIC_FIELD, referrer, referree, slot); | |
2503 } | |
2504 } | |
2505 | |
2506 // report an array referencing an element object | |
2507 inline bool CallbackInvoker::report_array_element_reference(oop referrer, oop referree, jint index) { | |
2508 if (is_basic_heap_walk()) { | |
2509 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2510 } else { | |
2511 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_ARRAY_ELEMENT, referrer, referree, index); | |
2512 } | |
2513 } | |
2514 | |
2515 // report an object referencing an instance field object | |
2516 inline bool CallbackInvoker::report_field_reference(oop referrer, oop referree, jint slot) { | |
2517 if (is_basic_heap_walk()) { | |
2518 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_FIELD, referrer, referree, slot); | |
2519 } else { | |
2520 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_FIELD, referrer, referree, slot); | |
2521 } | |
2522 } | |
2523 | |
2524 // report an array referencing an element object | |
2525 inline bool CallbackInvoker::report_constant_pool_reference(oop referrer, oop referree, jint index) { | |
2526 if (is_basic_heap_walk()) { | |
2527 return invoke_basic_object_reference_callback(JVMTI_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2528 } else { | |
2529 return invoke_advanced_object_reference_callback(JVMTI_HEAP_REFERENCE_CONSTANT_POOL, referrer, referree, index); | |
2530 } | |
2531 } | |
2532 | |
2533 // A supporting closure used to process simple roots | |
2534 class SimpleRootsClosure : public OopClosure { | |
2535 private: | |
2536 jvmtiHeapReferenceKind _kind; | |
2537 bool _continue; | |
2538 | |
2539 jvmtiHeapReferenceKind root_kind() { return _kind; } | |
2540 | |
2541 public: | |
2542 void set_kind(jvmtiHeapReferenceKind kind) { | |
2543 _kind = kind; | |
2544 _continue = true; | |
2545 } | |
2546 | |
2547 inline bool stopped() { | |
2548 return !_continue; | |
2549 } | |
2550 | |
2551 void do_oop(oop* obj_p) { | |
2552 // iteration has terminated | |
2553 if (stopped()) { | |
2554 return; | |
2555 } | |
2556 | |
2557 // ignore null or deleted handles | |
2558 oop o = *obj_p; | |
2559 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2560 return; | |
2561 } | |
2562 | |
6738
ec98e58952b2
7197350: NPG: jvmtiHeapReferenceCallback receives incorrect reference_kind for system class roots
stefank
parents:
6735
diff
changeset
|
2563 assert(Universe::heap()->is_in_reserved(o), "should be impossible"); |
ec98e58952b2
7197350: NPG: jvmtiHeapReferenceCallback receives incorrect reference_kind for system class roots
stefank
parents:
6735
diff
changeset
|
2564 |
0 | 2565 jvmtiHeapReferenceKind kind = root_kind(); |
6738
ec98e58952b2
7197350: NPG: jvmtiHeapReferenceCallback receives incorrect reference_kind for system class roots
stefank
parents:
6735
diff
changeset
|
2566 if (kind == JVMTI_HEAP_REFERENCE_SYSTEM_CLASS) { |
0 | 2567 // SystemDictionary::always_strong_oops_do reports the application |
2568 // class loader as a root. We want this root to be reported as | |
2569 // a root kind of "OTHER" rather than "SYSTEM_CLASS". | |
6738
ec98e58952b2
7197350: NPG: jvmtiHeapReferenceCallback receives incorrect reference_kind for system class roots
stefank
parents:
6735
diff
changeset
|
2570 if (!o->is_instanceMirror()) { |
0 | 2571 kind = JVMTI_HEAP_REFERENCE_OTHER; |
2572 } | |
6738
ec98e58952b2
7197350: NPG: jvmtiHeapReferenceCallback receives incorrect reference_kind for system class roots
stefank
parents:
6735
diff
changeset
|
2573 } |
0 | 2574 |
2575 // some objects are ignored - in the case of simple | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2145
diff
changeset
|
2576 // roots it's mostly Symbol*s that we are skipping |
0 | 2577 // here. |
2578 if (!ServiceUtil::visible_oop(o)) { | |
2579 return; | |
2580 } | |
2581 | |
2582 // invoke the callback | |
2583 _continue = CallbackInvoker::report_simple_root(kind, o); | |
2584 | |
2585 } | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
2586 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2587 }; |
2588 | |
2589 // A supporting closure used to process JNI locals | |
2590 class JNILocalRootsClosure : public OopClosure { | |
2591 private: | |
2592 jlong _thread_tag; | |
2593 jlong _tid; | |
2594 jint _depth; | |
2595 jmethodID _method; | |
2596 bool _continue; | |
2597 public: | |
2598 void set_context(jlong thread_tag, jlong tid, jint depth, jmethodID method) { | |
2599 _thread_tag = thread_tag; | |
2600 _tid = tid; | |
2601 _depth = depth; | |
2602 _method = method; | |
2603 _continue = true; | |
2604 } | |
2605 | |
2606 inline bool stopped() { | |
2607 return !_continue; | |
2608 } | |
2609 | |
2610 void do_oop(oop* obj_p) { | |
2611 // iteration has terminated | |
2612 if (stopped()) { | |
2613 return; | |
2614 } | |
2615 | |
2616 // ignore null or deleted handles | |
2617 oop o = *obj_p; | |
2618 if (o == NULL || o == JNIHandles::deleted_handle()) { | |
2619 return; | |
2620 } | |
2621 | |
2622 if (!ServiceUtil::visible_oop(o)) { | |
2623 return; | |
2624 } | |
2625 | |
2626 // invoke the callback | |
2627 _continue = CallbackInvoker::report_jni_local_root(_thread_tag, _tid, _depth, _method, o); | |
2628 } | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
2629 virtual void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
0 | 2630 }; |
2631 | |
2632 | |
2633 // A VM operation to iterate over objects that are reachable from | |
2634 // a set of roots or an initial object. | |
2635 // | |
2636 // For VM_HeapWalkOperation the set of roots used is :- | |
2637 // | |
2638 // - All JNI global references | |
2639 // - All inflated monitors | |
2640 // - All classes loaded by the boot class loader (or all classes | |
2641 // in the event that class unloading is disabled) | |
2642 // - All java threads | |
2643 // - For each java thread then all locals and JNI local references | |
2644 // on the thread's execution stack | |
2645 // - All visible/explainable objects from Universes::oops_do | |
2646 // | |
2647 class VM_HeapWalkOperation: public VM_Operation { | |
2648 private: | |
2649 enum { | |
2650 initial_visit_stack_size = 4000 | |
2651 }; | |
2652 | |
2653 bool _is_advanced_heap_walk; // indicates FollowReferences | |
2654 JvmtiTagMap* _tag_map; | |
2655 Handle _initial_object; | |
2656 GrowableArray<oop>* _visit_stack; // the visit stack | |
2657 | |
2658 bool _collecting_heap_roots; // are we collecting roots | |
2659 bool _following_object_refs; // are we following object references | |
2660 | |
2661 bool _reporting_primitive_fields; // optional reporting | |
2662 bool _reporting_primitive_array_values; | |
2663 bool _reporting_string_values; | |
2664 | |
2665 GrowableArray<oop>* create_visit_stack() { | |
6197 | 2666 return new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(initial_visit_stack_size, true); |
0 | 2667 } |
2668 | |
2669 // accessors | |
2670 bool is_advanced_heap_walk() const { return _is_advanced_heap_walk; } | |
2671 JvmtiTagMap* tag_map() const { return _tag_map; } | |
2672 Handle initial_object() const { return _initial_object; } | |
2673 | |
2674 bool is_following_references() const { return _following_object_refs; } | |
2675 | |
2676 bool is_reporting_primitive_fields() const { return _reporting_primitive_fields; } | |
2677 bool is_reporting_primitive_array_values() const { return _reporting_primitive_array_values; } | |
2678 bool is_reporting_string_values() const { return _reporting_string_values; } | |
2679 | |
2680 GrowableArray<oop>* visit_stack() const { return _visit_stack; } | |
2681 | |
2682 // iterate over the various object types | |
2683 inline bool iterate_over_array(oop o); | |
2684 inline bool iterate_over_type_array(oop o); | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2685 inline bool iterate_over_class(oop o); |
0 | 2686 inline bool iterate_over_object(oop o); |
2687 | |
2688 // root collection | |
2689 inline bool collect_simple_roots(); | |
2690 inline bool collect_stack_roots(); | |
2691 inline bool collect_stack_roots(JavaThread* java_thread, JNILocalRootsClosure* blk); | |
2692 | |
2693 // visit an object | |
2694 inline bool visit(oop o); | |
2695 | |
2696 public: | |
2697 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2698 Handle initial_object, | |
2699 BasicHeapWalkContext callbacks, | |
2700 const void* user_data); | |
2701 | |
2702 VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2703 Handle initial_object, | |
2704 AdvancedHeapWalkContext callbacks, | |
2705 const void* user_data); | |
2706 | |
2707 ~VM_HeapWalkOperation(); | |
2708 | |
2709 VMOp_Type type() const { return VMOp_HeapWalkOperation; } | |
2710 void doit(); | |
2711 }; | |
2712 | |
2713 | |
2714 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2715 Handle initial_object, | |
2716 BasicHeapWalkContext callbacks, | |
2717 const void* user_data) { | |
2718 _is_advanced_heap_walk = false; | |
2719 _tag_map = tag_map; | |
2720 _initial_object = initial_object; | |
2721 _following_object_refs = (callbacks.object_ref_callback() != NULL); | |
2722 _reporting_primitive_fields = false; | |
2723 _reporting_primitive_array_values = false; | |
2724 _reporting_string_values = false; | |
2725 _visit_stack = create_visit_stack(); | |
2726 | |
2727 | |
2728 CallbackInvoker::initialize_for_basic_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2729 } | |
2730 | |
2731 VM_HeapWalkOperation::VM_HeapWalkOperation(JvmtiTagMap* tag_map, | |
2732 Handle initial_object, | |
2733 AdvancedHeapWalkContext callbacks, | |
2734 const void* user_data) { | |
2735 _is_advanced_heap_walk = true; | |
2736 _tag_map = tag_map; | |
2737 _initial_object = initial_object; | |
2738 _following_object_refs = true; | |
2739 _reporting_primitive_fields = (callbacks.primitive_field_callback() != NULL);; | |
2740 _reporting_primitive_array_values = (callbacks.array_primitive_value_callback() != NULL);; | |
2741 _reporting_string_values = (callbacks.string_primitive_value_callback() != NULL);; | |
2742 _visit_stack = create_visit_stack(); | |
2743 | |
2744 CallbackInvoker::initialize_for_advanced_heap_walk(tag_map, _visit_stack, user_data, callbacks); | |
2745 } | |
2746 | |
2747 VM_HeapWalkOperation::~VM_HeapWalkOperation() { | |
2748 if (_following_object_refs) { | |
2749 assert(_visit_stack != NULL, "checking"); | |
2750 delete _visit_stack; | |
2751 _visit_stack = NULL; | |
2752 } | |
2753 } | |
2754 | |
2755 // an array references its class and has a reference to | |
2756 // each element in the array | |
2757 inline bool VM_HeapWalkOperation::iterate_over_array(oop o) { | |
2758 objArrayOop array = objArrayOop(o); | |
2759 | |
2760 // array reference to its class | |
6831
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
coleenp
parents:
6738
diff
changeset
|
2761 oop mirror = ObjArrayKlass::cast(array->klass())->java_mirror(); |
0 | 2762 if (!CallbackInvoker::report_class_reference(o, mirror)) { |
2763 return false; | |
2764 } | |
2765 | |
2766 // iterate over the array and report each reference to a | |
2767 // non-null element | |
2768 for (int index=0; index<array->length(); index++) { | |
2769 oop elem = array->obj_at(index); | |
2770 if (elem == NULL) { | |
2771 continue; | |
2772 } | |
2773 | |
2774 // report the array reference o[index] = elem | |
2775 if (!CallbackInvoker::report_array_element_reference(o, elem, index)) { | |
2776 return false; | |
2777 } | |
2778 } | |
2779 return true; | |
2780 } | |
2781 | |
2782 // a type array references its class | |
2783 inline bool VM_HeapWalkOperation::iterate_over_type_array(oop o) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2784 Klass* k = o->klass(); |
6983 | 2785 oop mirror = k->java_mirror(); |
0 | 2786 if (!CallbackInvoker::report_class_reference(o, mirror)) { |
2787 return false; | |
2788 } | |
2789 | |
2790 // report the array contents if required | |
2791 if (is_reporting_primitive_array_values()) { | |
2792 if (!CallbackInvoker::report_primitive_array_values(o)) { | |
2793 return false; | |
2794 } | |
2795 } | |
2796 return true; | |
2797 } | |
2798 | |
2799 // verify that a static oop field is in range | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2800 static inline bool verify_static_oop(InstanceKlass* ik, |
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2801 oop mirror, int offset) { |
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2802 address obj_p = (address)mirror + offset; |
6735
aed758eda82a
7195833: NPG: Rename instanceClassLoaderKlass, instanceRefKlass and instanceMirrorKlass
coleenp
parents:
6725
diff
changeset
|
2803 address start = (address)InstanceMirrorKlass::start_of_static_fields(mirror); |
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2804 address end = start + (java_lang_Class::static_oop_field_count(mirror) * heapOopSize); |
0 | 2805 assert(end >= start, "sanity check"); |
2806 | |
2807 if (obj_p >= start && obj_p < end) { | |
2808 return true; | |
2809 } else { | |
2810 return false; | |
2811 } | |
2812 } | |
2813 | |
2814 // a class references its super class, interfaces, class loader, ... | |
2815 // and finally its static fields | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2816 inline bool VM_HeapWalkOperation::iterate_over_class(oop java_class) { |
0 | 2817 int i; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2818 Klass* klass = java_lang_Class::as_Klass(java_class); |
0 | 2819 |
2820 if (klass->oop_is_instance()) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2821 InstanceKlass* ik = InstanceKlass::cast(klass); |
0 | 2822 |
2823 // ignore the class if it's has been initialized yet | |
2824 if (!ik->is_linked()) { | |
2825 return true; | |
2826 } | |
2827 | |
2828 // get the java mirror | |
2829 oop mirror = klass->java_mirror(); | |
2830 | |
2831 // super (only if something more interesting than java.lang.Object) | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2832 Klass* java_super = ik->java_super(); |
1142 | 2833 if (java_super != NULL && java_super != SystemDictionary::Object_klass()) { |
6983 | 2834 oop super = java_super->java_mirror(); |
0 | 2835 if (!CallbackInvoker::report_superclass_reference(mirror, super)) { |
2836 return false; | |
2837 } | |
2838 } | |
2839 | |
2840 // class loader | |
2841 oop cl = ik->class_loader(); | |
2842 if (cl != NULL) { | |
2843 if (!CallbackInvoker::report_class_loader_reference(mirror, cl)) { | |
2844 return false; | |
2845 } | |
2846 } | |
2847 | |
2848 // protection domain | |
2849 oop pd = ik->protection_domain(); | |
2850 if (pd != NULL) { | |
2851 if (!CallbackInvoker::report_protection_domain_reference(mirror, pd)) { | |
2852 return false; | |
2853 } | |
2854 } | |
2855 | |
2856 // signers | |
2857 oop signers = ik->signers(); | |
2858 if (signers != NULL) { | |
2859 if (!CallbackInvoker::report_signers_reference(mirror, signers)) { | |
2860 return false; | |
2861 } | |
2862 } | |
2863 | |
2864 // references from the constant pool | |
2865 { | |
10265
92ef81e2f571
8003557: NPG: Klass* const k should be const Klass* k.
minqi
parents:
10161
diff
changeset
|
2866 ConstantPool* pool = ik->constants(); |
0 | 2867 for (int i = 1; i < pool->length(); i++) { |
2868 constantTag tag = pool->tag_at(i).value(); | |
2869 if (tag.is_string() || tag.is_klass()) { | |
2870 oop entry; | |
2871 if (tag.is_string()) { | |
2872 entry = pool->resolved_string_at(i); | |
6855
bbeecede56dd
8000459: assert(java_lang_String::is_instance(entry)) failure with various mlvm tests.
jiangli
parents:
6738
diff
changeset
|
2873 // If the entry is non-null it is resolved. |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2874 if (entry == NULL) continue; |
0 | 2875 } else { |
6983 | 2876 entry = pool->resolved_klass_at(i)->java_mirror(); |
0 | 2877 } |
2878 if (!CallbackInvoker::report_constant_pool_reference(mirror, entry, (jint)i)) { | |
2879 return false; | |
2880 } | |
2881 } | |
2882 } | |
2883 } | |
2884 | |
2885 // interfaces | |
2886 // (These will already have been reported as references from the constant pool | |
2887 // but are specified by IterateOverReachableObjects and must be reported). | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2888 Array<Klass*>* interfaces = ik->local_interfaces(); |
0 | 2889 for (i = 0; i < interfaces->length(); i++) { |
6983 | 2890 oop interf = ((Klass*)interfaces->at(i))->java_mirror(); |
0 | 2891 if (interf == NULL) { |
2892 continue; | |
2893 } | |
2894 if (!CallbackInvoker::report_interface_reference(mirror, interf)) { | |
2895 return false; | |
2896 } | |
2897 } | |
2898 | |
2899 // iterate over the static fields | |
2900 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2901 ClassFieldMap* field_map = ClassFieldMap::create_map_of_static_fields(klass); |
0 | 2902 for (i=0; i<field_map->field_count(); i++) { |
2903 ClassFieldDescriptor* field = field_map->field_at(i); | |
2904 char type = field->field_type(); | |
2905 if (!is_primitive_field_type(type)) { | |
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2906 oop fld_o = mirror->obj_field(field->field_offset()); |
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2177
diff
changeset
|
2907 assert(verify_static_oop(ik, mirror, field->field_offset()), "sanity check"); |
0 | 2908 if (fld_o != NULL) { |
2909 int slot = field->field_index(); | |
2910 if (!CallbackInvoker::report_static_field_reference(mirror, fld_o, slot)) { | |
2911 delete field_map; | |
2912 return false; | |
2913 } | |
2914 } | |
2915 } else { | |
2916 if (is_reporting_primitive_fields()) { | |
2377
57552dca1708
7029509: nightly failures after static fields in Class
never
parents:
2376
diff
changeset
|
2917 address addr = (address)mirror + field->field_offset(); |
0 | 2918 int slot = field->field_index(); |
2919 if (!CallbackInvoker::report_primitive_static_field(mirror, slot, addr, type)) { | |
2920 delete field_map; | |
2921 return false; | |
2922 } | |
2923 } | |
2924 } | |
2925 } | |
2926 delete field_map; | |
2927 | |
2928 return true; | |
2929 } | |
2930 | |
2931 return true; | |
2932 } | |
2933 | |
2934 // an object references a class and its instance fields | |
2935 // (static fields are ignored here as we report these as | |
2936 // references from the class). | |
2937 inline bool VM_HeapWalkOperation::iterate_over_object(oop o) { | |
2938 // reference to the class | |
6983 | 2939 if (!CallbackInvoker::report_class_reference(o, o->klass()->java_mirror())) { |
0 | 2940 return false; |
2941 } | |
2942 | |
2943 // iterate over instance fields | |
2944 ClassFieldMap* field_map = JvmtiCachedClassFieldMap::get_map_of_instance_fields(o); | |
2945 for (int i=0; i<field_map->field_count(); i++) { | |
2946 ClassFieldDescriptor* field = field_map->field_at(i); | |
2947 char type = field->field_type(); | |
2948 if (!is_primitive_field_type(type)) { | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
2949 oop fld_o = o->obj_field(field->field_offset()); |
4929
2b150750d53d
7130993: nsk/jdi/ReferenceType/instances/instances004 fails with JFR: assert(ServiceUtil::visible_oop(obj))
sspitsyn
parents:
3816
diff
changeset
|
2950 // ignore any objects that aren't visible to profiler |
2b150750d53d
7130993: nsk/jdi/ReferenceType/instances/instances004 fails with JFR: assert(ServiceUtil::visible_oop(obj))
sspitsyn
parents:
3816
diff
changeset
|
2951 if (fld_o != NULL && ServiceUtil::visible_oop(fld_o)) { |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2952 assert(Universe::heap()->is_in_reserved(fld_o), "unsafe code should not " |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2953 "have references to Klass* anymore"); |
0 | 2954 int slot = field->field_index(); |
2955 if (!CallbackInvoker::report_field_reference(o, fld_o, slot)) { | |
2956 return false; | |
2957 } | |
2958 } | |
2959 } else { | |
2960 if (is_reporting_primitive_fields()) { | |
2961 // primitive instance field | |
2962 address addr = (address)o + field->field_offset(); | |
2963 int slot = field->field_index(); | |
2964 if (!CallbackInvoker::report_primitive_instance_field(o, slot, addr, type)) { | |
2965 return false; | |
2966 } | |
2967 } | |
2968 } | |
2969 } | |
2970 | |
2971 // if the object is a java.lang.String | |
2972 if (is_reporting_string_values() && | |
1142 | 2973 o->klass() == SystemDictionary::String_klass()) { |
0 | 2974 if (!CallbackInvoker::report_string_value(o)) { |
2975 return false; | |
2976 } | |
2977 } | |
2978 return true; | |
2979 } | |
2980 | |
2981 | |
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
2982 // Collects all simple (non-stack) roots except for threads; |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
2983 // threads are handled in collect_stack_roots() as an optimization. |
0 | 2984 // if there's a heap root callback provided then the callback is |
2985 // invoked for each simple root. | |
2986 // if an object reference callback is provided then all simple | |
2987 // roots are pushed onto the marking stack so that they can be | |
2988 // processed later | |
2989 // | |
2990 inline bool VM_HeapWalkOperation::collect_simple_roots() { | |
2991 SimpleRootsClosure blk; | |
2992 | |
2993 // JNI globals | |
2994 blk.set_kind(JVMTI_HEAP_REFERENCE_JNI_GLOBAL); | |
2995 JNIHandles::oops_do(&blk); | |
2996 if (blk.stopped()) { | |
2997 return false; | |
2998 } | |
2999 | |
3000 // Preloaded classes and loader from the system dictionary | |
3001 blk.set_kind(JVMTI_HEAP_REFERENCE_SYSTEM_CLASS); | |
3002 SystemDictionary::always_strong_oops_do(&blk); | |
6738
ec98e58952b2
7197350: NPG: jvmtiHeapReferenceCallback receives incorrect reference_kind for system class roots
stefank
parents:
6735
diff
changeset
|
3003 KlassToOopClosure klass_blk(&blk); |
ec98e58952b2
7197350: NPG: jvmtiHeapReferenceCallback receives incorrect reference_kind for system class roots
stefank
parents:
6735
diff
changeset
|
3004 ClassLoaderDataGraph::always_strong_oops_do(&blk, &klass_blk, false); |
0 | 3005 if (blk.stopped()) { |
3006 return false; | |
3007 } | |
3008 | |
3009 // Inflated monitors | |
3010 blk.set_kind(JVMTI_HEAP_REFERENCE_MONITOR); | |
3011 ObjectSynchronizer::oops_do(&blk); | |
3012 if (blk.stopped()) { | |
3013 return false; | |
3014 } | |
3015 | |
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3016 // threads are now handled in collect_stack_roots() |
0 | 3017 |
3018 // Other kinds of roots maintained by HotSpot | |
3019 // Many of these won't be visible but others (such as instances of important | |
3020 // exceptions) will be visible. | |
3021 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); | |
3022 Universe::oops_do(&blk); | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3023 |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3024 // 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
parents:
579
diff
changeset
|
3025 blk.set_kind(JVMTI_HEAP_REFERENCE_OTHER); |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
12316
diff
changeset
|
3026 CodeBlobToOopClosure look_in_blobs(&blk, !CodeBlobToOopClosure::FixRelocations); |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3027 CodeCache::scavenge_root_nmethods_do(&look_in_blobs); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
579
diff
changeset
|
3028 |
0 | 3029 return true; |
3030 } | |
3031 | |
3032 // Walk the stack of a given thread and find all references (locals | |
3033 // and JNI calls) and report these as stack references | |
3034 inline bool VM_HeapWalkOperation::collect_stack_roots(JavaThread* java_thread, | |
3035 JNILocalRootsClosure* blk) | |
3036 { | |
3037 oop threadObj = java_thread->threadObj(); | |
3038 assert(threadObj != NULL, "sanity check"); | |
3039 | |
3040 // only need to get the thread's tag once per thread | |
3041 jlong thread_tag = tag_for(_tag_map, threadObj); | |
3042 | |
3043 // also need the thread id | |
3044 jlong tid = java_lang_Thread::thread_id(threadObj); | |
3045 | |
3046 | |
3047 if (java_thread->has_last_Java_frame()) { | |
3048 | |
3049 // vframes are resource allocated | |
3050 Thread* current_thread = Thread::current(); | |
3051 ResourceMark rm(current_thread); | |
3052 HandleMark hm(current_thread); | |
3053 | |
3054 RegisterMap reg_map(java_thread); | |
3055 frame f = java_thread->last_frame(); | |
3056 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); | |
3057 | |
3058 bool is_top_frame = true; | |
3059 int depth = 0; | |
3060 frame* last_entry_frame = NULL; | |
3061 | |
3062 while (vf != NULL) { | |
3063 if (vf->is_java_frame()) { | |
3064 | |
3065 // java frame (interpreted, compiled, ...) | |
3066 javaVFrame *jvf = javaVFrame::cast(vf); | |
3067 | |
3068 // the jmethodID | |
3069 jmethodID method = jvf->method()->jmethod_id(); | |
3070 | |
3071 if (!(jvf->method()->is_native())) { | |
3072 jlocation bci = (jlocation)jvf->bci(); | |
3073 StackValueCollection* locals = jvf->locals(); | |
3074 for (int slot=0; slot<locals->size(); slot++) { | |
3075 if (locals->at(slot)->type() == T_OBJECT) { | |
3076 oop o = locals->obj_at(slot)(); | |
3077 if (o == NULL) { | |
3078 continue; | |
3079 } | |
3080 | |
3081 // stack reference | |
3082 if (!CallbackInvoker::report_stack_ref_root(thread_tag, tid, depth, method, | |
3083 bci, slot, o)) { | |
3084 return false; | |
3085 } | |
3086 } | |
3087 } | |
3088 } else { | |
3089 blk->set_context(thread_tag, tid, depth, method); | |
3090 if (is_top_frame) { | |
3091 // JNI locals for the top frame. | |
3092 java_thread->active_handles()->oops_do(blk); | |
3093 } else { | |
3094 if (last_entry_frame != NULL) { | |
3095 // JNI locals for the entry frame | |
3096 assert(last_entry_frame->is_entry_frame(), "checking"); | |
3097 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(blk); | |
3098 } | |
3099 } | |
3100 } | |
3101 last_entry_frame = NULL; | |
3102 depth++; | |
3103 } else { | |
3104 // externalVFrame - for an entry frame then we report the JNI locals | |
3105 // when we find the corresponding javaVFrame | |
3106 frame* fr = vf->frame_pointer(); | |
3107 assert(fr != NULL, "sanity check"); | |
3108 if (fr->is_entry_frame()) { | |
3109 last_entry_frame = fr; | |
3110 } | |
3111 } | |
3112 | |
3113 vf = vf->sender(); | |
3114 is_top_frame = false; | |
3115 } | |
3116 } else { | |
3117 // no last java frame but there may be JNI locals | |
3118 blk->set_context(thread_tag, tid, 0, (jmethodID)NULL); | |
3119 java_thread->active_handles()->oops_do(blk); | |
3120 } | |
3121 return true; | |
3122 } | |
3123 | |
3124 | |
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3125 // Collects the simple roots for all threads and collects all |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3126 // stack roots - for each thread it walks the execution |
0 | 3127 // stack to find all references and local JNI refs. |
3128 inline bool VM_HeapWalkOperation::collect_stack_roots() { | |
3129 JNILocalRootsClosure blk; | |
3130 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { | |
3131 oop threadObj = thread->threadObj(); | |
3132 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { | |
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3133 // Collect the simple root for this thread before we |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3134 // collect its stack roots |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3135 if (!CallbackInvoker::report_simple_root(JVMTI_HEAP_REFERENCE_THREAD, |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3136 threadObj)) { |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3137 return false; |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3138 } |
0 | 3139 if (!collect_stack_roots(thread, &blk)) { |
3140 return false; | |
3141 } | |
3142 } | |
3143 } | |
3144 return true; | |
3145 } | |
3146 | |
3147 // visit an object | |
3148 // first mark the object as visited | |
3149 // second get all the outbound references from this object (in other words, all | |
3150 // the objects referenced by this object). | |
3151 // | |
3152 bool VM_HeapWalkOperation::visit(oop o) { | |
3153 // mark object as visited | |
3154 assert(!ObjectMarker::visited(o), "can't visit same object more than once"); | |
3155 ObjectMarker::mark(o); | |
3156 | |
3157 // instance | |
3158 if (o->is_instance()) { | |
1142 | 3159 if (o->klass() == SystemDictionary::Class_klass()) { |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
3160 if (!java_lang_Class::is_primitive(o)) { |
0 | 3161 // a java.lang.Class |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
3162 return iterate_over_class(o); |
0 | 3163 } |
3164 } else { | |
3165 return iterate_over_object(o); | |
3166 } | |
3167 } | |
3168 | |
3169 // object array | |
3170 if (o->is_objArray()) { | |
3171 return iterate_over_array(o); | |
3172 } | |
3173 | |
3174 // type array | |
3175 if (o->is_typeArray()) { | |
3176 return iterate_over_type_array(o); | |
3177 } | |
3178 | |
3179 return true; | |
3180 } | |
3181 | |
3182 void VM_HeapWalkOperation::doit() { | |
3183 ResourceMark rm; | |
3184 ObjectMarkerController marker; | |
3185 ClassFieldMapCacheMark cm; | |
3186 | |
3187 assert(visit_stack()->is_empty(), "visit stack must be empty"); | |
3188 | |
3189 // the heap walk starts with an initial object or the heap roots | |
3190 if (initial_object().is_null()) { | |
3815 | 3191 // If either collect_stack_roots() or collect_simple_roots() |
3192 // returns false at this point, then there are no mark bits | |
3193 // to reset. | |
3194 ObjectMarker::set_needs_reset(false); | |
3195 | |
3816
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3196 // Calling collect_stack_roots() before collect_simple_roots() |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3197 // can result in a big performance boost for an agent that is |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3198 // focused on analyzing references in the thread stacks. |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3199 if (!collect_stack_roots()) return; |
88dce6a60ac8
6951623: 3/3 possible performance problems in FollowReferences() and GetObjectsWithTags()
dcubed
parents:
3815
diff
changeset
|
3200 |
0 | 3201 if (!collect_simple_roots()) return; |
3815 | 3202 |
3203 // no early return so enable heap traversal to reset the mark bits | |
3204 ObjectMarker::set_needs_reset(true); | |
0 | 3205 } else { |
3206 visit_stack()->push(initial_object()()); | |
3207 } | |
3208 | |
3209 // object references required | |
3210 if (is_following_references()) { | |
3211 | |
3212 // visit each object until all reachable objects have been | |
3213 // visited or the callback asked to terminate the iteration. | |
3214 while (!visit_stack()->is_empty()) { | |
3215 oop o = visit_stack()->pop(); | |
3216 if (!ObjectMarker::visited(o)) { | |
3217 if (!visit(o)) { | |
3218 break; | |
3219 } | |
3220 } | |
3221 } | |
3222 } | |
3223 } | |
3224 | |
3225 // iterate over all objects that are reachable from a set of roots | |
3226 void JvmtiTagMap::iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
3227 jvmtiStackReferenceCallback stack_ref_callback, | |
3228 jvmtiObjectReferenceCallback object_ref_callback, | |
3229 const void* user_data) { | |
3230 MutexLocker ml(Heap_lock); | |
3231 BasicHeapWalkContext context(heap_root_callback, stack_ref_callback, object_ref_callback); | |
3232 VM_HeapWalkOperation op(this, Handle(), context, user_data); | |
3233 VMThread::execute(&op); | |
3234 } | |
3235 | |
3236 // iterate over all objects that are reachable from a given object | |
3237 void JvmtiTagMap::iterate_over_objects_reachable_from_object(jobject object, | |
3238 jvmtiObjectReferenceCallback object_ref_callback, | |
3239 const void* user_data) { | |
3240 oop obj = JNIHandles::resolve(object); | |
3241 Handle initial_object(Thread::current(), obj); | |
3242 | |
3243 MutexLocker ml(Heap_lock); | |
3244 BasicHeapWalkContext context(NULL, NULL, object_ref_callback); | |
3245 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3246 VMThread::execute(&op); | |
3247 } | |
3248 | |
3249 // follow references from an initial object or the GC roots | |
3250 void JvmtiTagMap::follow_references(jint heap_filter, | |
3251 KlassHandle klass, | |
3252 jobject object, | |
3253 const jvmtiHeapCallbacks* callbacks, | |
3254 const void* user_data) | |
3255 { | |
3256 oop obj = JNIHandles::resolve(object); | |
3257 Handle initial_object(Thread::current(), obj); | |
3258 | |
3259 MutexLocker ml(Heap_lock); | |
3260 AdvancedHeapWalkContext context(heap_filter, klass, callbacks); | |
3261 VM_HeapWalkOperation op(this, initial_object, context, user_data); | |
3262 VMThread::execute(&op); | |
3263 } | |
3264 | |
3265 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3266 void JvmtiTagMap::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) { |
2145
c1a0ede55d6f
7012493: 2/2 6849574/Test.java fails with Internal Error (src/share/vm/prims/jvmtiTagMap.cpp:3294)
dcubed
parents:
2125
diff
changeset
|
3267 // 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
|
3268 // 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
|
3269 // 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
|
3270 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
|
3271 SafepointSynchronize::is_at_safepoint(), |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3272 "must be executed at a safepoint"); |
0 | 3273 if (JvmtiEnv::environments_might_exist()) { |
3274 JvmtiEnvIterator it; | |
3275 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
3276 JvmtiTagMap* tag_map = env->tag_map(); | |
3277 if (tag_map != NULL && !tag_map->is_empty()) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3278 tag_map->do_weak_oops(is_alive, f); |
0 | 3279 } |
3280 } | |
3281 } | |
3282 } | |
3283 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3284 void JvmtiTagMap::do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f) { |
0 | 3285 |
3286 // does this environment have the OBJECT_FREE event enabled | |
3287 bool post_object_free = env()->is_enabled(JVMTI_EVENT_OBJECT_FREE); | |
3288 | |
3289 // counters used for trace message | |
3290 int freed = 0; | |
3291 int moved = 0; | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3292 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3293 JvmtiTagHashmap* hashmap = this->hashmap(); |
0 | 3294 |
3295 // reenable sizing (if disabled) | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3296 hashmap->set_resizing_enabled(true); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3297 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3298 // if the hashmap is empty then we can skip it |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3299 if (hashmap->_entry_count == 0) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3300 return; |
0 | 3301 } |
3302 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3303 // now iterate through each entry in the table |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3304 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3305 JvmtiTagHashmapEntry** table = hashmap->table(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3306 int size = hashmap->size(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3307 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3308 JvmtiTagHashmapEntry* delayed_add = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3309 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3310 for (int pos = 0; pos < size; ++pos) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3311 JvmtiTagHashmapEntry* entry = table[pos]; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3312 JvmtiTagHashmapEntry* prev = NULL; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3313 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3314 while (entry != NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3315 JvmtiTagHashmapEntry* next = entry->next(); |
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
parents:
1972
diff
changeset
|
3317 oop* obj = entry->object_addr(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3318 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3319 // has object been GC'ed |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3320 if (!is_alive->do_object_b(entry->object())) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3321 // grab the tag |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3322 jlong tag = entry->tag(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3323 guarantee(tag != 0, "checking"); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3324 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3325 // remove GC'ed entry from hashmap and return the |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3326 // entry to the free list |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3327 hashmap->remove(prev, pos, entry); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3328 destroy_entry(entry); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3329 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3330 // post the event to the profiler |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3331 if (post_object_free) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3332 JvmtiExport::post_object_free(env(), tag); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3333 } |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3334 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3335 ++freed; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3336 } else { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3337 f->do_oop(entry->object_addr()); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3338 oop new_oop = entry->object(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3339 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3340 // 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
|
3341 // entry to its new location. |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3342 unsigned int new_pos = JvmtiTagHashmap::hash(new_oop, size); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3343 if (new_pos != (unsigned int)pos) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3344 if (prev == NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3345 table[pos] = next; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3346 } else { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3347 prev->set_next(next); |
0 | 3348 } |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3349 if (new_pos < (unsigned int)pos) { |
0 | 3350 entry->set_next(table[new_pos]); |
3351 table[new_pos] = entry; | |
3352 } else { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3353 // 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
|
3354 // hitting it again during this iteration. |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3355 entry->set_next(delayed_add); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3356 delayed_add = entry; |
0 | 3357 } |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3358 moved++; |
0 | 3359 } else { |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3360 // object didn't move |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3361 prev = entry; |
0 | 3362 } |
3363 } | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3364 |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3365 entry = next; |
0 | 3366 } |
3367 } | |
3368 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3369 // Re-add all the entries which were kept aside |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3370 while (delayed_add != NULL) { |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3371 JvmtiTagHashmapEntry* next = delayed_add->next(); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3372 unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3373 delayed_add->set_next(table[pos]); |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3374 table[pos] = delayed_add; |
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3375 delayed_add = next; |
0 | 3376 } |
3377 | |
3378 // stats | |
3379 if (TraceJVMTIObjectTagging) { | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3380 int post_total = hashmap->_entry_count; |
0 | 3381 int pre_total = post_total + freed; |
3382 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
1972
diff
changeset
|
3383 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
|
3384 pre_total, post_total, freed, moved); |
0 | 3385 } |
3386 } |