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 // A constantPool is an array containing class constants as described in the
26 // class file.
27 //
28 // Most of the constant pool entries are written during class parsing, which
29 // is safe. For klass and string types, the constant pool entry is
30 // modified when the entry is resolved. If a klass or string constant pool
31 // entry is read without a lock, only the resolved state guarantees that
32 // the entry in the constant pool is a klass or String object and
33 // not a symbolOop.
34
35 class SymbolHashMap;
36
37 class constantPoolOopDesc : public oopDesc {
38 friend class VMStructs;
39 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast
40 private:
41 typeArrayOop _tags; // the tag array describing the constant pool's contents
42 constantPoolCacheOop _cache; // the cache holding interpreter runtime information
43 klassOop _pool_holder; // the corresponding class
44 int _flags; // a few header bits to describe contents for GC
649
650 void add_entry(symbolOop sym, u2 value);
651 SymbolHashMapEntry* find_entry(symbolOop sym);
652
653 u2 symbol_to_value(symbolOop sym) {
654 SymbolHashMapEntry *entry = find_entry(sym);
655 return (entry == NULL) ? 0 : entry->value();
656 }
657
658 ~SymbolHashMap() {
659 SymbolHashMapEntry* next;
660 for (int i = 0; i < _table_size; i++) {
661 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
662 next = cur->next();
663 delete(cur);
664 }
665 }
666 delete _buckets;
667 }
668 }; // End SymbolHashMap class
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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 #ifndef SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP
26 #define SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP
27
28 #include "oops/arrayOop.hpp"
29 #include "oops/cpCacheOop.hpp"
30 #include "oops/typeArrayOop.hpp"
31 #include "utilities/constantTag.hpp"
32 #ifdef TARGET_ARCH_x86
33 # include "bytes_x86.hpp"
34 #endif
35 #ifdef TARGET_ARCH_sparc
36 # include "bytes_sparc.hpp"
37 #endif
38 #ifdef TARGET_ARCH_zero
39 # include "bytes_zero.hpp"
40 #endif
41
42 // A constantPool is an array containing class constants as described in the
43 // class file.
44 //
45 // Most of the constant pool entries are written during class parsing, which
46 // is safe. For klass and string types, the constant pool entry is
47 // modified when the entry is resolved. If a klass or string constant pool
48 // entry is read without a lock, only the resolved state guarantees that
49 // the entry in the constant pool is a klass or String object and
50 // not a symbolOop.
51
52 class SymbolHashMap;
53
54 class constantPoolOopDesc : public oopDesc {
55 friend class VMStructs;
56 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast
57 private:
58 typeArrayOop _tags; // the tag array describing the constant pool's contents
59 constantPoolCacheOop _cache; // the cache holding interpreter runtime information
60 klassOop _pool_holder; // the corresponding class
61 int _flags; // a few header bits to describe contents for GC
666
667 void add_entry(symbolOop sym, u2 value);
668 SymbolHashMapEntry* find_entry(symbolOop sym);
669
670 u2 symbol_to_value(symbolOop sym) {
671 SymbolHashMapEntry *entry = find_entry(sym);
672 return (entry == NULL) ? 0 : entry->value();
673 }
674
675 ~SymbolHashMap() {
676 SymbolHashMapEntry* next;
677 for (int i = 0; i < _table_size; i++) {
678 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
679 next = cur->next();
680 delete(cur);
681 }
682 }
683 delete _buckets;
684 }
685 }; // End SymbolHashMap class
686
687 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP
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