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comparison src/share/vm/oops/fieldInfo.hpp @ 4137:04b9a2566eec

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Merge with hsx23/hotspot.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 21:40:27 +0100
parents e6b1331a51d2
children 71afdabfd05b
comparison
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3737:9dc19b7d89a3 4137:04b9a2566eec
1 /*
2 * Copyright (c) 2011, 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 #ifndef SHARE_VM_OOPS_FIELDINFO_HPP
26 #define SHARE_VM_OOPS_FIELDINFO_HPP
27
28 #include "oops/typeArrayOop.hpp"
29 #include "classfile/vmSymbols.hpp"
30
31 // This class represents the field information contained in the fields
32 // array of an instanceKlass. Currently it's laid on top an array of
33 // Java shorts but in the future it could simply be used as a real
34 // array type. FieldInfo generally shouldn't be used directly.
35 // Fields should be queried either through instanceKlass or through
36 // the various FieldStreams.
37 class FieldInfo VALUE_OBJ_CLASS_SPEC {
38 friend class fieldDescriptor;
39 friend class JavaFieldStream;
40 friend class ClassFileParser;
41
42 public:
43 // fields
44 // Field info extracted from the class file and stored
45 // as an array of 7 shorts
46 enum FieldOffset {
47 access_flags_offset = 0,
48 name_index_offset = 1,
49 signature_index_offset = 2,
50 initval_index_offset = 3,
51 low_offset = 4,
52 high_offset = 5,
53 generic_signature_offset = 6,
54 field_slots = 7
55 };
56
57 private:
58 u2 _shorts[field_slots];
59
60 void set_name_index(u2 val) { _shorts[name_index_offset] = val; }
61 void set_signature_index(u2 val) { _shorts[signature_index_offset] = val; }
62 void set_initval_index(u2 val) { _shorts[initval_index_offset] = val; }
63 void set_generic_signature_index(u2 val) { _shorts[generic_signature_offset] = val; }
64
65 u2 name_index() const { return _shorts[name_index_offset]; }
66 u2 signature_index() const { return _shorts[signature_index_offset]; }
67 u2 initval_index() const { return _shorts[initval_index_offset]; }
68 u2 generic_signature_index() const { return _shorts[generic_signature_offset]; }
69
70 public:
71 static FieldInfo* from_field_array(typeArrayOop fields, int index) {
72 return ((FieldInfo*)fields->short_at_addr(index * field_slots));
73 }
74
75 void initialize(u2 access_flags,
76 u2 name_index,
77 u2 signature_index,
78 u2 initval_index,
79 u2 generic_signature_index,
80 u4 offset) {
81 _shorts[access_flags_offset] = access_flags;
82 _shorts[name_index_offset] = name_index;
83 _shorts[signature_index_offset] = signature_index;
84 _shorts[initval_index_offset] = initval_index;
85 _shorts[generic_signature_offset] = generic_signature_index;
86 set_offset(offset);
87 }
88
89 u2 access_flags() const { return _shorts[access_flags_offset]; }
90 u4 offset() const { return build_int_from_shorts(_shorts[low_offset], _shorts[high_offset]); }
91
92 Symbol* name(constantPoolHandle cp) const {
93 int index = name_index();
94 if (is_internal()) {
95 return lookup_symbol(index);
96 }
97 return cp->symbol_at(index);
98 }
99
100 Symbol* signature(constantPoolHandle cp) const {
101 int index = signature_index();
102 if (is_internal()) {
103 return lookup_symbol(index);
104 }
105 return cp->symbol_at(index);
106 }
107
108 Symbol* generic_signature(constantPoolHandle cp) const {
109 int index = generic_signature_index();
110 if (index == 0) {
111 return NULL;
112 }
113 return cp->symbol_at(index);
114 }
115
116 void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; }
117 void set_offset(u4 val) {
118 _shorts[low_offset] = extract_low_short_from_int(val);
119 _shorts[high_offset] = extract_high_short_from_int(val);
120 }
121
122 bool is_internal() const {
123 return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0;
124 }
125
126 Symbol* lookup_symbol(int symbol_index) const {
127 assert(is_internal(), "only internal fields");
128 return vmSymbols::symbol_at((vmSymbols::SID)symbol_index);
129 }
130 };
131
132 #endif // SHARE_VM_OOPS_FIELDINFO_HPP