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 #define InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE( \
55 T, start_p, count, do_oop, \
56 assert_fn) \
57 { \
58 T* p = (T*)(start_p); \
59 T* const end = p + (count); \
60 while (p < end) { \
61 (assert_fn)(p); \
62 do_oop; \
63 ++p; \
64 } \
65 }
66
67 #define InstanceMirrorKlass_SPECIALIZED_BOUNDED_OOP_ITERATE( \
68 T, start_p, count, low, high, \
69 do_oop, assert_fn) \
70 { \
71 T* const l = (T*)(low); \
72 T* const h = (T*)(high); \
73 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 && \
74 mask_bits((intptr_t)h, sizeof(T)-1) == 0, \
75 "bounded region must be properly aligned"); \
76 T* p = (T*)(start_p); \
77 T* end = p + (count); \
78 if (p < l) p = l; \
79 if (end > h) end = h; \
80 while (p < end) { \
81 (assert_fn)(p); \
82 do_oop; \
83 ++p; \
84 } \
85 }
86
87
88 #define InstanceMirrorKlass_OOP_ITERATE(start_p, count, \
89 do_oop, assert_fn) \
90 { \
91 if (UseCompressedOops) { \
92 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE(narrowOop, \
93 start_p, count, \
94 do_oop, assert_fn) \
95 } else { \
96 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE(oop, \
97 start_p, count, \
98 do_oop, assert_fn) \
99 } \
100 }
101
102 // The following macros call specialized macros, passing either oop or
103 // narrowOop as the specialization type. These test the UseCompressedOops
104 // flag.
105 #define InstanceMirrorKlass_BOUNDED_OOP_ITERATE(start_p, count, low, high, \
106 do_oop, assert_fn) \
107 { \
108 if (UseCompressedOops) { \
109 InstanceMirrorKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop, \
110 start_p, count, \
111 low, high, \
112 do_oop, assert_fn) \
113 } else { \
114 InstanceMirrorKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop, \
115 start_p, count, \
116 low, high, \
117 do_oop, assert_fn) \
118 } \
119 }
120
121
122 void InstanceMirrorKlass::oop_follow_contents(oop obj) {
123 InstanceKlass::oop_follow_contents(obj);
124
125 // Follow the klass field in the mirror.
126 Klass* klass = java_lang_Class::as_Klass(obj);
127 if (klass != NULL) {
128 // An anonymous class doesn't have its own class loader, so the call
129 // to follow_klass will mark and push its java mirror instead of the
130 // class loader. When handling the java mirror for an anonymous class
131 // we need to make sure its class loader data is claimed, this is done
132 // by calling follow_class_loader explicitly. For non-anonymous classes
133 // the call to follow_class_loader is made when the class loader itself
134 // is handled.
135 if (klass->oop_is_instance() && InstanceKlass::cast(klass)->is_anonymous()) {
136 MarkSweep::follow_class_loader(klass->class_loader_data());
137 } else {
138 MarkSweep::follow_klass(klass);
139 }
140 } else {
141 // If klass is NULL then this a mirror for a primitive type.
142 // We don't have to follow them, since they are handled as strong
143 // roots in Universe::oops_do.
144 assert(java_lang_Class::is_primitive(obj), "Sanity check");
145 }
146
147 InstanceMirrorKlass_OOP_ITERATE( \
148 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj), \
149 MarkSweep::mark_and_push(p), \
150 assert_is_in_closed_subset)
151 }
152
153 #if INCLUDE_ALL_GCS
154 void InstanceMirrorKlass::oop_follow_contents(ParCompactionManager* cm,
155 oop obj) {
156 InstanceKlass::oop_follow_contents(cm, obj);
157
158 // Follow the klass field in the mirror.
159 Klass* klass = java_lang_Class::as_Klass(obj);
160 if (klass != NULL) {
161 // An anonymous class doesn't have its own class loader, so the call
162 // to follow_klass will mark and push its java mirror instead of the
163 // class loader. When handling the java mirror for an anonymous class
164 // we need to make sure its class loader data is claimed, this is done
165 // by calling follow_class_loader explicitly. For non-anonymous classes
166 // the call to follow_class_loader is made when the class loader itself
167 // is handled.
168 if (klass->oop_is_instance() && InstanceKlass::cast(klass)->is_anonymous()) {
169 PSParallelCompact::follow_class_loader(cm, klass->class_loader_data());
170 } else {
171 PSParallelCompact::follow_klass(cm, klass);
172 }
173 } else {
174 // If klass is NULL then this a mirror for a primitive type.
175 // We don't have to follow them, since they are handled as strong
176 // roots in Universe::oops_do.
177 assert(java_lang_Class::is_primitive(obj), "Sanity check");
178 }
179
180 InstanceMirrorKlass_OOP_ITERATE( \
181 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj), \
182 PSParallelCompact::mark_and_push(cm, p), \
183 assert_is_in)
184 }
185 #endif // INCLUDE_ALL_GCS
186
187 int InstanceMirrorKlass::oop_adjust_pointers(oop obj) {
188 int size = oop_size(obj);
189 InstanceKlass::oop_adjust_pointers(obj);
190
191 InstanceMirrorKlass_OOP_ITERATE( \
192 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj), \
193 MarkSweep::adjust_pointer(p), \
194 assert_nothing)
195 return size;
196 }
197
198 #define InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(T, nv_suffix) \
199 InstanceMirrorKlass_OOP_ITERATE( \
200 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj), \
201 (closure)->do_oop##nv_suffix(p), \
202 assert_is_in_closed_subset) \
203 return oop_size(obj); \
204
205 #define InstanceMirrorKlass_BOUNDED_SPECIALIZED_OOP_ITERATE(T, nv_suffix, mr) \
206 InstanceMirrorKlass_BOUNDED_OOP_ITERATE( \
207 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj), \
208 mr.start(), mr.end(), \
209 (closure)->do_oop##nv_suffix(p), \
210 assert_is_in_closed_subset) \
211 return oop_size(obj); \
212
213
214 // Macro to define InstanceMirrorKlass::oop_oop_iterate for virtual/nonvirtual for
215 // all closures. Macros calling macros above for each oop size.
216
217 #define InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \
218 \
219 int InstanceMirrorKlass:: \
220 oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
221 /* Get size before changing pointers */ \
222 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk); \
223 \
224 InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \
225 \
226 if_do_metadata_checked(closure, nv_suffix) { \
227 Klass* klass = java_lang_Class::as_Klass(obj); \
228 /* We'll get NULL for primitive mirrors. */ \
229 if (klass != NULL) { \
230 closure->do_klass##nv_suffix(klass); \
231 } \
232 } \
233 \
234 if (UseCompressedOops) { \
235 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(narrowOop, nv_suffix); \
236 } else { \
237 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(oop, nv_suffix); \
238 } \
239 }
240
241 #if INCLUDE_ALL_GCS
242 #define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
243 \
244 int InstanceMirrorKlass:: \
245 oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \
246 /* Get size before changing pointers */ \
247 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk); \
248 \
249 InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \
250 \
251 if (UseCompressedOops) { \
252 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(narrowOop, nv_suffix); \
253 } else { \
254 InstanceMirrorKlass_SPECIALIZED_OOP_ITERATE_DEFN(oop, nv_suffix); \
255 } \
256 }
257 #endif // INCLUDE_ALL_GCS
258
259
260 #define InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
261 \
262 int InstanceMirrorKlass:: \
263 oop_oop_iterate##nv_suffix##_m(oop obj, \
264 OopClosureType* closure, \
265 MemRegion mr) { \
266 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk); \
267 \
268 InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \
269 \
270 if_do_metadata_checked(closure, nv_suffix) { \
271 if (mr.contains(obj)) { \
272 Klass* klass = java_lang_Class::as_Klass(obj); \
273 /* We'll get NULL for primitive mirrors. */ \
274 if (klass != NULL) { \
275 closure->do_klass##nv_suffix(klass); \
276 } \
277 } \
278 } \
279 \
280 if (UseCompressedOops) { \
281 InstanceMirrorKlass_BOUNDED_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr); \
282 } else { \
283 InstanceMirrorKlass_BOUNDED_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr); \
284 } \
285 }
286
287 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN)
288 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN)
289 #if INCLUDE_ALL_GCS
290 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
291 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
292 #endif // INCLUDE_ALL_GCS
293 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN_m)
294 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DEFN_m)
295
296 #if INCLUDE_ALL_GCS
297 void InstanceMirrorKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
298 // Note that we don't have to follow the mirror -> klass pointer, since all
299 // klasses that are dirty will be scavenged when we iterate over the
300 // ClassLoaderData objects.
301
302 InstanceKlass::oop_push_contents(pm, obj);
303 InstanceMirrorKlass_OOP_ITERATE( \
304 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj),\
305 if (PSScavenge::should_scavenge(p)) { \
306 pm->claim_or_forward_depth(p); \
307 }, \
308 assert_nothing )
309 }
310
311 int InstanceMirrorKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
312 int size = oop_size(obj);
313 InstanceKlass::oop_update_pointers(cm, obj);
314
315 InstanceMirrorKlass_OOP_ITERATE( \
316 start_of_static_fields(obj), java_lang_Class::static_oop_field_count(obj),\
317 PSParallelCompact::adjust_pointer(p), \
318 assert_nothing)
319 return size;
320 }
321 #endif // INCLUDE_ALL_GCS
322
323 int InstanceMirrorKlass::instance_size(KlassHandle k) {
324 if (k() != NULL && k->oop_is_instance()) {
325 return align_object_size(size_helper() + InstanceKlass::cast(k())->static_field_size());
326 }
327 return size_helper();
328 }
329
330 instanceOop InstanceMirrorKlass::allocate_instance(KlassHandle k, TRAPS) {
331 // Query before forming handle.
332 int size = instance_size(k);
333 KlassHandle h_k(THREAD, this);
334 instanceOop i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL);
335
336 // Since mirrors can be variable sized because of the static fields, store
337 // the size in the mirror itself.
338 java_lang_Class::set_oop_size(i, size);
339
340 return i;
341 }
342
343 int InstanceMirrorKlass::oop_size(oop obj) const {
344 return java_lang_Class::oop_size(obj);
345 }
346
347 int InstanceMirrorKlass::compute_static_oop_field_count(oop obj) {
348 Klass* k = java_lang_Class::as_Klass(obj);
349 if (k != NULL && k->oop_is_instance()) {
350 return InstanceKlass::cast(k)->static_oop_field_count();
351 }
352 return 0;
353 }