1 /*
2 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "gc_implementation/shared/markSweep.inline.hpp"
29 #include "gc_interface/collectedHeap.inline.hpp"
30 #include "memory/genOopClosures.inline.hpp"
31 #include "memory/iterator.inline.hpp"
32 #include "memory/oopFactory.hpp"
33 #include "oops/instanceKlass.hpp"
34 #include "oops/instanceMirrorKlass.hpp"
35 #include "oops/instanceOop.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "oops/symbol.hpp"
38 #include "runtime/handles.inline.hpp"
39 #include "utilities/macros.hpp"
40 #if INCLUDE_ALL_GCS
41 #include "gc_implementation/concurrentMarkSweep/cmsOopClosures.inline.hpp"
42 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
43 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
44 #include "gc_implementation/g1/g1RemSet.inline.hpp"
45 #include "gc_implementation/g1/heapRegionManager.inline.hpp"
46 #include "gc_implementation/parNew/parOopClosures.inline.hpp"
47 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
48 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
49 #include "oops/oop.pcgc.inline.hpp"
50 #endif // INCLUDE_ALL_GCS
51
52 int InstanceMirrorKlass::_offset_of_static_fields = 0;
53
54 #ifdef ASSERT
55 template <class T> void assert_is_in(T *p) {
56 T heap_oop = oopDesc::load_heap_oop(p);
57 if (!oopDesc::is_null(heap_oop)) {
58 oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
59 assert(Universe::heap()->is_in(o), "should be in heap");
60 }
61 }
62 template <class T> void assert_is_in_closed_subset(T *p) {
63 T heap_oop = oopDesc::load_heap_oop(p);
64 if (!oopDesc::is_null(heap_oop)) {
65 oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
66 assert(Universe::heap()->is_in_closed_subset(o), "should be in closed");
67 }
68 }
69 template <class T> void assert_is_in_reserved(T *p) {
70 T heap_oop = oopDesc::load_heap_oop(p);
71 if (!oopDesc::is_null(heap_oop)) {
72 oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
73 assert(Universe::heap()->is_in_reserved(o), "should be in reserved");
74 }
75 }
76 template <class T> void assert_nothing(T *p) {}
77
78 #else
79 template <class T> void assert_is_in(T *p) {}
80 template <class T> void assert_is_in_closed_subset(T *p) {}
81 template <class T> void assert_is_in_reserved(T *p) {}
82 template <class T> void assert_nothing(T *p) {}
83 #endif // ASSERT
84
85 #define InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE( \
86 T, start_p, count, do_oop, \
87 assert_fn) \
88 { \
89 T* p = (T*)(start_p); \
90 T* const end = p + (count); \
91 while (p < end) { \
92 (assert_fn)(p); \
93 do_oop; \
94 ++p; \
95 } \
96 }
97
98 #define InstanceMirrorKlass_SPECIALIZED_BOUNDED_OOP_ITERATE( \
99 T, start_p, count, low, high, \
100 do_oop, assert_fn) \
101 { \
102 T* const l = (T*)(low); \
103 T* const h = (T*)(high); \
104 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 && \
105 mask_bits((intptr_t)h, sizeof(T)-1) == 0, \
106 "bounded region must be properly aligned"); \
107 T* p = (T*)(start_p); \
108 T* end = p + (count); \
109 if (p < l) p = l; \
110 if (end > h) end = h; \
111 while (p < end) { \
112 (assert_fn)(p); \
113 do_oop; \
114 ++p; \
115 } \
116 }
117
118
119 #define InstanceMirrorKlass_OOP_ITERATE(start_p, count, \
120 do_oop, assert_fn) \
121 { \
122 if (UseCompressedOops) { \
123 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE(narrowOop, \
124 start_p, count, \
125 do_oop, assert_fn) \
126 } else { \
127 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE(oop, \
128 start_p, count, \
129 do_oop, assert_fn) \
130 } \
131 }
132
133 // The following macros call specialized macros, passing either oop or
134 // narrowOop as the specialization type. These test the UseCompressedOops
135 // flag.
136 #define InstanceMirrorKlass_BOUNDED_OOP_ITERATE(start_p, count, low, high, \
137 do_oop, assert_fn) \
138 { \
139 if (UseCompressedOops) { \
140 InstanceMirrorKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop, \
141 start_p, count, \
142 low, high, \
143 do_oop, assert_fn) \
144 } else { \
145 InstanceMirrorKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop, \
146 start_p, count, \
147 low, high, \
148 do_oop, assert_fn) \
149 } \
150 }
151
152
153 void InstanceMirrorKlass::oop_follow_contents(oop obj) {
154 InstanceKlass::oop_follow_contents(obj);
155
156 // Follow the klass field in the mirror.
157 Klass* klass = java_lang_Class::as_Klass(obj);
158 if (klass != NULL) {
159 // An anonymous class doesn't have its own class loader, so the call
160 // to follow_klass will mark and push its java mirror instead of the
161 // class loader. When handling the java mirror for an anonymous class
162 // we need to make sure its class loader data is claimed, this is done
163 // by calling follow_class_loader explicitly. For non-anonymous classes
164 // the call to follow_class_loader is made when the class loader itself
165 // is handled.
166 if (klass->oop_is_instance() && InstanceKlass::cast(klass)->is_anonymous()) {
167 MarkSweep::follow_class_loader(klass->class_loader_data());
168 } else {
169 MarkSweep::follow_klass(klass);
170 }
171 } else {
172 // If klass is NULL then this a mirror for a primitive type.
173 // We don't have to follow them, since they are handled as strong
174 // roots in Universe::oops_do.
175 assert(java_lang_Class::is_primitive(obj), "Sanity check");
176 }
177
178 InstanceMirrorKlass_OOP_ITERATE( \
179 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj), \
180 MarkSweep::mark_and_push(p), \
181 assert_is_in_closed_subset)
182 }
183
184 #if INCLUDE_ALL_GCS
185 void InstanceMirrorKlass::oop_follow_contents(ParCompactionManager* cm,
186 oop obj) {
187 InstanceKlass::oop_follow_contents(cm, obj);
188
189 // Follow the klass field in the mirror.
190 Klass* klass = java_lang_Class::as_Klass(obj);
191 if (klass != NULL) {
192 // An anonymous class doesn't have its own class loader, so the call
193 // to follow_klass will mark and push its java mirror instead of the
194 // class loader. When handling the java mirror for an anonymous class
195 // we need to make sure its class loader data is claimed, this is done
196 // by calling follow_class_loader explicitly. For non-anonymous classes
197 // the call to follow_class_loader is made when the class loader itself
198 // is handled.
199 if (klass->oop_is_instance() && InstanceKlass::cast(klass)->is_anonymous()) {
200 PSParallelCompact::follow_class_loader(cm, klass->class_loader_data());
201 } else {
202 PSParallelCompact::follow_klass(cm, klass);
203 }
204 } else {
205 // If klass is NULL then this a mirror for a primitive type.
206 // We don't have to follow them, since they are handled as strong
207 // roots in Universe::oops_do.
208 assert(java_lang_Class::is_primitive(obj), "Sanity check");
209 }
210
211 InstanceMirrorKlass_OOP_ITERATE( \
212 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj), \
213 PSParallelCompact::mark_and_push(cm, p), \
214 assert_is_in)
215 }
216 #endif // INCLUDE_ALL_GCS
217
218 int InstanceMirrorKlass::oop_adjust_pointers(oop obj) {
219 int size = oop_size(obj);
220 InstanceKlass::oop_adjust_pointers(obj);
221
222 InstanceMirrorKlass_OOP_ITERATE( \
223 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj), \
224 MarkSweep::adjust_pointer(p), \
225 assert_nothing)
226 return size;
227 }
228
229 #define InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(T, nv_suffix) \
230 InstanceMirrorKlass_OOP_ITERATE( \
231 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj), \
232 (closure)->do_oop##nv_suffix(p), \
233 assert_is_in_closed_subset) \
234 return oop_size(obj); \
235
236 #define InstanceMirrorKlass_BOUNDED_SPECIALIZED_OOP_ITERATE(T, nv_suffix, mr) \
237 InstanceMirrorKlass_BOUNDED_OOP_ITERATE( \
238 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj), \
239 mr.start(), mr.end(), \
240 (closure)->do_oop##nv_suffix(p), \
241 assert_is_in_closed_subset) \
242 return oop_size(obj); \
243
244
245 // Macro to define InstanceMirrorKlass::oop_oop_iterate for virtual/nonvirtual for
246 // all closures. Macros calling macros above for each oop size.
247
248 #define InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \
249 \
250 int InstanceMirrorKlass:: \
251 oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
252 /* Get size before changing pointers */ \
253 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk); \
254 \
255 InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \
256 \
257 if_do_metadata_checked(closure, nv_suffix) { \
258 Klass* klass = java_lang_Class::as_Klass(obj); \
259 /* We'll get NULL for primitive mirrors. */ \
260 if (klass != NULL) { \
261 closure->do_klass##nv_suffix(klass); \
262 } \
263 } \
264 \
265 if (UseCompressedOops) { \
266 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(narrowOop, nv_suffix); \
267 } else { \
268 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(oop, nv_suffix); \
269 } \
270 }
271
272 #if INCLUDE_ALL_GCS
273 #define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
274 \
275 int InstanceMirrorKlass:: \
276 oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \
277 /* Get size before changing pointers */ \
278 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk); \
279 \
280 InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \
281 \
282 if (UseCompressedOops) { \
283 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(narrowOop, nv_suffix); \
284 } else { \
285 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(oop, nv_suffix); \
286 } \
287 }
288 #endif // INCLUDE_ALL_GCS
289
290
291 #define InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
292 \
293 int InstanceMirrorKlass:: \
294 oop_oop_iterate##nv_suffix##_m(oop obj, \
295 OopClosureType* closure, \
296 MemRegion mr) { \
297 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk); \
298 \
299 InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \
300 \
301 if_do_metadata_checked(closure, nv_suffix) { \
302 if (mr.contains(obj)) { \
303 Klass* klass = java_lang_Class::as_Klass(obj); \
304 /* We'll get NULL for primitive mirrors. */ \
305 if (klass != NULL) { \
306 closure->do_klass##nv_suffix(klass); \
307 } \
308 } \
309 } \
310 \
311 if (UseCompressedOops) { \
312 InstanceMirrorKlass_BOUNDED_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr); \
313 } else { \
314 InstanceMirrorKlass_BOUNDED_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr); \
315 } \
316 }
317
318 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN)
319 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN)
320 #if INCLUDE_ALL_GCS
321 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
322 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
323 #endif // INCLUDE_ALL_GCS
324 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN_m)
325 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN_m)
326
327 #if INCLUDE_ALL_GCS
328 void InstanceMirrorKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
329 // Note that we don't have to follow the mirror -> klass pointer, since all
330 // klasses that are dirty will be scavenged when we iterate over the
331 // ClassLoaderData objects.
332
333 InstanceKlass::oop_push_contents(pm, obj);
334 InstanceMirrorKlass_OOP_ITERATE( \
335 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj),\
336 if (PSScavenge::should_scavenge(p)) { \
337 pm->claim_or_forward_depth(p); \
338 }, \
339 assert_nothing )
340 }
341
342 int InstanceMirrorKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
343 int size = oop_size(obj);
344 InstanceKlass::oop_update_pointers(cm, obj);
345
346 InstanceMirrorKlass_OOP_ITERATE( \
347 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj),\
348 PSParallelCompact::adjust_pointer(p), \
349 assert_nothing)
350 return size;
351 }
352 #endif // INCLUDE_ALL_GCS
353
354 int InstanceMirrorKlass::instance_size(KlassHandle k) {
355 if (k() != NULL && k->oop_is_instance()) {
356 return align_object_size(size_helper() + InstanceKlass::cast(k())->static_field_size());
357 }
358 return size_helper();
359 }
360
361 instanceOop InstanceMirrorKlass::allocate_instance(KlassHandle k, TRAPS) {
362 // Query before forming handle.
363 int size = instance_size(k);
364 KlassHandle h_k(THREAD, this);
365 instanceOop i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL);
366
367 // Since mirrors can be variable sized because of the static fields, store
368 // the size in the mirror itself.
369 java_lang_Class::set_oop_size(i, size);
370
371 return i;
372 }
373
374 int InstanceMirrorKlass::oop_size(oop obj) const {
375 return java_lang_Class::oop_size(obj);
376 }
377
378 int InstanceMirrorKlass::compute_static_oop_field_count(oop obj) {
379 Klass* k = java_lang_Class::as_Klass(obj);
380 if (k != NULL && k->oop_is_instance()) {
381 return InstanceKlass::cast(k)->static_oop_field_count();
382 }
383 return 0;
384 }