1 /*
2 * Copyright (c) 1997, 2007, 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 "incls/_precompiled.incl"
26 # include "incls/_objArrayKlassKlass.cpp.incl"
27
28 klassOop objArrayKlassKlass::create_klass(TRAPS) {
29 objArrayKlassKlass o;
30 KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());
31 KlassHandle k = base_create_klass(h_this_klass, header_size(), o.vtbl_value(), CHECK_0);
32 assert(k()->size() == align_object_size(header_size()), "wrong size for object");
33 java_lang_Class::create_mirror(k, CHECK_0); // Allocate mirror
34 return k();
35 }
36
37 klassOop objArrayKlassKlass::allocate_system_objArray_klass(TRAPS) {
38 // system_objArrays have no instance klass, so allocate with fake class, then reset to NULL
39 KlassHandle kk(THREAD, Universe::intArrayKlassObj());
40 klassOop k = allocate_objArray_klass(1, kk, CHECK_0);
41 objArrayKlass* tk = (objArrayKlass*) k->klass_part();
42 tk->set_element_klass(NULL);
43 tk->set_bottom_klass(NULL);
44 return k;
45 }
46
47
48 klassOop objArrayKlassKlass::allocate_objArray_klass(int n, KlassHandle element_klass, TRAPS) {
49 objArrayKlassKlassHandle this_oop(THREAD, as_klassOop());
50 return allocate_objArray_klass_impl(this_oop, n, element_klass, THREAD);
51 }
52
53 klassOop objArrayKlassKlass::allocate_objArray_klass_impl(objArrayKlassKlassHandle this_oop,
54 int n, KlassHandle element_klass, TRAPS) {
55
56 // Eagerly allocate the direct array supertype.
57 KlassHandle super_klass = KlassHandle();
58 if (!Universe::is_bootstrapping()) {
59 KlassHandle element_super (THREAD, element_klass->super());
60 if (element_super.not_null()) {
61 // The element type has a direct super. E.g., String[] has direct super of Object[].
62 super_klass = KlassHandle(THREAD, element_super->array_klass_or_null());
63 bool supers_exist = super_klass.not_null();
64 // Also, see if the element has secondary supertypes.
65 // We need an array type for each.
66 objArrayHandle element_supers = objArrayHandle(THREAD,
67 element_klass->secondary_supers());
68 for( int i = element_supers->length()-1; i >= 0; i-- ) {
69 klassOop elem_super = (klassOop) element_supers->obj_at(i);
70 if (Klass::cast(elem_super)->array_klass_or_null() == NULL) {
71 supers_exist = false;
72 break;
73 }
74 }
75 if (!supers_exist) {
76 // Oops. Not allocated yet. Back out, allocate it, and retry.
77 #ifndef PRODUCT
78 if (WizardMode) {
79 tty->print_cr("Must retry array klass creation for depth %d",n);
80 }
81 #endif
82 KlassHandle ek;
83 {
84 MutexUnlocker mu(MultiArray_lock);
85 MutexUnlocker mc(Compile_lock); // for vtables
86 klassOop sk = element_super->array_klass(CHECK_0);
87 super_klass = KlassHandle(THREAD, sk);
88 for( int i = element_supers->length()-1; i >= 0; i-- ) {
89 KlassHandle elem_super (THREAD, element_supers->obj_at(i));
90 elem_super->array_klass(CHECK_0);
91 }
92 // Now retry from the beginning
93 klassOop klass_oop = element_klass->array_klass(n, CHECK_0);
94 // Create a handle because the enclosing brace, when locking
95 // can cause a gc. Better to have this function return a Handle.
96 ek = KlassHandle(THREAD, klass_oop);
97 } // re-lock
98 return ek();
99 }
100 } else {
101 // The element type is already Object. Object[] has direct super of Object.
102 super_klass = KlassHandle(THREAD, SystemDictionary::Object_klass());
103 }
104 }
105
106 // Create type name for klass (except for symbol arrays, since symbolKlass
107 // does not have a name). This will potentially allocate an object, cause
108 // GC, and all other kinds of things. Hence, this must be done before we
109 // get a handle to the new objArrayKlass we want to construct. We cannot
110 // block while holding a handling to a partly initialized object.
111 symbolHandle name = symbolHandle();
112
113 if (!element_klass->oop_is_symbol()) {
114 ResourceMark rm(THREAD);
115 char *name_str = element_klass->name()->as_C_string();
116 int len = element_klass->name()->utf8_length();
117 char *new_str = NEW_RESOURCE_ARRAY(char, len + 4);
118 int idx = 0;
119 new_str[idx++] = '[';
120 if (element_klass->oop_is_instance()) { // it could be an array or simple type
121 new_str[idx++] = 'L';
122 }
123 memcpy(&new_str[idx], name_str, len * sizeof(char));
124 idx += len;
125 if (element_klass->oop_is_instance()) {
126 new_str[idx++] = ';';
127 }
128 new_str[idx++] = '\0';
129 name = oopFactory::new_symbol_handle(new_str, CHECK_0);
130 }
131
132 objArrayKlass o;
133 arrayKlassHandle k = arrayKlass::base_create_array_klass(o.vtbl_value(),
134 objArrayKlass::header_size(),
135 this_oop,
136 CHECK_0);
137
138
139 // Initialize instance variables
140 objArrayKlass* oak = objArrayKlass::cast(k());
141 oak->set_dimension(n);
142 oak->set_element_klass(element_klass());
143 oak->set_name(name());
144
145 klassOop bk;
146 if (element_klass->oop_is_objArray()) {
147 bk = objArrayKlass::cast(element_klass())->bottom_klass();
148 } else {
149 bk = element_klass();
150 }
151 assert(bk != NULL && (Klass::cast(bk)->oop_is_instance() || Klass::cast(bk)->oop_is_typeArray()), "invalid bottom klass");
152 oak->set_bottom_klass(bk);
153
154 oak->set_layout_helper(array_layout_helper(T_OBJECT));
155 assert(oak->oop_is_javaArray(), "sanity");
156 assert(oak->oop_is_objArray(), "sanity");
157
158 // Call complete_create_array_klass after all instance variables has been initialized.
159 arrayKlass::complete_create_array_klass(k, super_klass, CHECK_0);
160
161 return k();
162 }
163
164
165 void objArrayKlassKlass::oop_follow_contents(oop obj) {
166 assert(obj->is_klass(), "must be klass");
167 assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");
168
169 objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);
170 MarkSweep::mark_and_push(oak->element_klass_addr());
171 MarkSweep::mark_and_push(oak->bottom_klass_addr());
172
173 arrayKlassKlass::oop_follow_contents(obj);
174 }
175
176 #ifndef SERIALGC
177 void objArrayKlassKlass::oop_follow_contents(ParCompactionManager* cm,
178 oop obj) {
179 assert(obj->is_klass(), "must be klass");
180 assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");
181
182 objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);
183 PSParallelCompact::mark_and_push(cm, oak->element_klass_addr());
184 PSParallelCompact::mark_and_push(cm, oak->bottom_klass_addr());
185
186 arrayKlassKlass::oop_follow_contents(cm, obj);
187 }
188 #endif // SERIALGC
189
190
191 int objArrayKlassKlass::oop_adjust_pointers(oop obj) {
192 assert(obj->is_klass(), "must be klass");
193 assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");
194
195 objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);
196 MarkSweep::adjust_pointer(oak->element_klass_addr());
197 MarkSweep::adjust_pointer(oak->bottom_klass_addr());
198
199 return arrayKlassKlass::oop_adjust_pointers(obj);
200 }
201
202
203
204 int objArrayKlassKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
205 assert(obj->is_klass(), "must be klass");
206 assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");
207
208 objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);
209 blk->do_oop(oak->element_klass_addr());
210 blk->do_oop(oak->bottom_klass_addr());
211
212 return arrayKlassKlass::oop_oop_iterate(obj, blk);
213 }
214
215
216 int
217 objArrayKlassKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
218 assert(obj->is_klass(), "must be klass");
219 assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");
220
221 objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);
222 oop* addr;
223 addr = oak->element_klass_addr();
224 if (mr.contains(addr)) blk->do_oop(addr);
225 addr = oak->bottom_klass_addr();
226 if (mr.contains(addr)) blk->do_oop(addr);
227
228 return arrayKlassKlass::oop_oop_iterate(obj, blk);
229 }
230
231 #ifndef SERIALGC
232 void objArrayKlassKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
233 assert(obj->blueprint()->oop_is_objArrayKlass(),"must be an obj array klass");
234 }
235
236 int objArrayKlassKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
237 assert(obj->is_klass(), "must be klass");
238 assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");
239
240 objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);
241 PSParallelCompact::adjust_pointer(oak->element_klass_addr());
242 PSParallelCompact::adjust_pointer(oak->bottom_klass_addr());
243
244 return arrayKlassKlass::oop_update_pointers(cm, obj);
245 }
246
247 int objArrayKlassKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,
248 HeapWord* beg_addr,
249 HeapWord* end_addr) {
250 assert(obj->is_klass(), "must be klass");
251 assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");
252
253 oop* p;
254 objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);
255 p = oak->element_klass_addr();
256 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
257 p = oak->bottom_klass_addr();
258 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
259
260 return arrayKlassKlass::oop_update_pointers(cm, obj, beg_addr, end_addr);
261 }
262 #endif // SERIALGC
263
264 #ifndef PRODUCT
265
266 // Printing
267
268 void objArrayKlassKlass::oop_print_on(oop obj, outputStream* st) {
269 assert(obj->is_klass(), "must be klass");
270 objArrayKlass* oak = (objArrayKlass*) klassOop(obj)->klass_part();
271 klassKlass::oop_print_on(obj, st);
272 st->print(" - instance klass: ");
273 oak->element_klass()->print_value_on(st);
274 st->cr();
275 }
276
277 #endif //PRODUCT
278
279 void objArrayKlassKlass::oop_print_value_on(oop obj, outputStream* st) {
280 assert(obj->is_klass(), "must be klass");
281 objArrayKlass* oak = (objArrayKlass*) klassOop(obj)->klass_part();
282
283 oak->element_klass()->print_value_on(st);
284 st->print("[]");
285 }
286
287 const char* objArrayKlassKlass::internal_name() const {
288 return "{object array class}";
289 }
290
291
292 // Verification
293
294 void objArrayKlassKlass::oop_verify_on(oop obj, outputStream* st) {
295 klassKlass::oop_verify_on(obj, st);
296 objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);
297 guarantee(oak->element_klass()->is_perm(), "should be in permspace");
298 guarantee(oak->element_klass()->is_klass(), "should be klass");
299 guarantee(oak->bottom_klass()->is_perm(), "should be in permspace");
300 guarantee(oak->bottom_klass()->is_klass(), "should be klass");
301 Klass* bk = Klass::cast(oak->bottom_klass());
302 guarantee(bk->oop_is_instance() || bk->oop_is_typeArray(), "invalid bottom klass");
303 }