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3938
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_OOPS_FIELDINFO_HPP
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26 #define SHARE_VM_OOPS_FIELDINFO_HPP
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27
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28 #include "oops/typeArrayOop.hpp"
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29 #include "classfile/vmSymbols.hpp"
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30
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31 // This class represents the field information contained in the fields
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32 // array of an instanceKlass. Currently it's laid on top an array of
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33 // Java shorts but in the future it could simply be used as a real
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34 // array type. FieldInfo generally shouldn't be used directly.
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35 // Fields should be queried either through instanceKlass or through
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36 // the various FieldStreams.
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37 class FieldInfo VALUE_OBJ_CLASS_SPEC {
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38 friend class fieldDescriptor;
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39 friend class JavaFieldStream;
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40 friend class ClassFileParser;
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41
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42 public:
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43 // fields
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44 // Field info extracted from the class file and stored
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45 // as an array of 7 shorts
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46 enum FieldOffset {
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47 access_flags_offset = 0,
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48 name_index_offset = 1,
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49 signature_index_offset = 2,
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50 initval_index_offset = 3,
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51 low_offset = 4,
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52 high_offset = 5,
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53 generic_signature_offset = 6,
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54 field_slots = 7
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55 };
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56
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57 private:
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58 u2 _shorts[field_slots];
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59
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60 void set_name_index(u2 val) { _shorts[name_index_offset] = val; }
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61 void set_signature_index(u2 val) { _shorts[signature_index_offset] = val; }
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62 void set_initval_index(u2 val) { _shorts[initval_index_offset] = val; }
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63 void set_generic_signature_index(u2 val) { _shorts[generic_signature_offset] = val; }
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64
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65 u2 name_index() const { return _shorts[name_index_offset]; }
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66 u2 signature_index() const { return _shorts[signature_index_offset]; }
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67 u2 initval_index() const { return _shorts[initval_index_offset]; }
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68 u2 generic_signature_index() const { return _shorts[generic_signature_offset]; }
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69
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70 public:
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71 static FieldInfo* from_field_array(typeArrayOop fields, int index) {
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72 return ((FieldInfo*)fields->short_at_addr(index * field_slots));
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73 }
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74
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75 void initialize(u2 access_flags,
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76 u2 name_index,
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77 u2 signature_index,
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78 u2 initval_index,
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79 u2 generic_signature_index,
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80 u4 offset) {
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81 _shorts[access_flags_offset] = access_flags;
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82 _shorts[name_index_offset] = name_index;
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83 _shorts[signature_index_offset] = signature_index;
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84 _shorts[initval_index_offset] = initval_index;
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85 _shorts[generic_signature_offset] = generic_signature_index;
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86 set_offset(offset);
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87 }
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88
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89 u2 access_flags() const { return _shorts[access_flags_offset]; }
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90 u4 offset() const { return build_int_from_shorts(_shorts[low_offset], _shorts[high_offset]); }
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91
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92 Symbol* name(constantPoolHandle cp) const {
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93 int index = name_index();
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94 if (is_internal()) {
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95 return lookup_symbol(index);
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96 }
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97 return cp->symbol_at(index);
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98 }
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99
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100 Symbol* signature(constantPoolHandle cp) const {
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101 int index = signature_index();
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102 if (is_internal()) {
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103 return lookup_symbol(index);
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104 }
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105 return cp->symbol_at(index);
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106 }
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107
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108 Symbol* generic_signature(constantPoolHandle cp) const {
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109 int index = generic_signature_index();
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110 if (index == 0) {
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111 return NULL;
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112 }
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113 return cp->symbol_at(index);
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114 }
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115
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116 void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; }
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117 void set_offset(u4 val) {
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118 _shorts[low_offset] = extract_low_short_from_int(val);
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119 _shorts[high_offset] = extract_high_short_from_int(val);
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120 }
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121
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122 bool is_internal() const {
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123 return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0;
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124 }
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125
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126 Symbol* lookup_symbol(int symbol_index) const {
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127 assert(is_internal(), "only internal fields");
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128 return vmSymbols::symbol_at((vmSymbols::SID)symbol_index);
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129 }
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130 };
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131
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132 #endif // SHARE_VM_OOPS_FIELDINFO_HPP
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