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_FIELDSTREAMS_HPP
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26 #define SHARE_VM_OOPS_FIELDSTREAMS_HPP
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27
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28 #include "oops/instanceKlass.hpp"
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29 #include "oops/fieldInfo.hpp"
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30
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31 // The is the base class for iteration over the fields array
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32 // describing the declared fields in the class. Several subclasses
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33 // are provided depending on the kind of iteration required. The
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34 // JavaFieldStream is for iterating over regular Java fields and it
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35 // generally the preferred iterator. InternalFieldStream only
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36 // iterates over fields that have been injected by the JVM.
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37 // AllFieldStream exposes all fields and should only be used in rare
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38 // cases.
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39 class FieldStreamBase : public StackObj {
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40 protected:
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41 typeArrayHandle _fields;
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42 constantPoolHandle _constants;
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43 int _index;
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44 int _limit;
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45
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46 FieldInfo* field() const { return FieldInfo::from_field_array(_fields(), _index); }
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47
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48 FieldStreamBase(typeArrayHandle fields, constantPoolHandle constants, int start, int limit) {
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49 _fields = fields;
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50 _constants = constants;
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51 _index = start;
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52 _limit = limit;
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53 }
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54
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55 FieldStreamBase(typeArrayHandle fields, constantPoolHandle constants) {
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56 _fields = fields;
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57 _constants = constants;
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58 _index = 0;
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59 _limit = fields->length() / FieldInfo::field_slots;
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60 }
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61
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62 public:
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63 FieldStreamBase(instanceKlass* klass) {
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64 _fields = klass->fields();
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65 _constants = klass->constants();
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66 _index = 0;
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67 _limit = klass->java_fields_count();
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68 }
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69 FieldStreamBase(instanceKlassHandle klass) {
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70 _fields = klass->fields();
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71 _constants = klass->constants();
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72 _index = 0;
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73 _limit = klass->java_fields_count();
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74 }
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75
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76 // accessors
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77 int index() const { return _index; }
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78
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79 void next() { _index += 1; }
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80 bool done() const { return _index >= _limit; }
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81
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82 // Accessors for current field
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83 AccessFlags access_flags() const {
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84 AccessFlags flags;
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85 flags.set_flags(field()->access_flags());
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86 return flags;
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87 }
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88
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89 void set_access_flags(u2 flags) const {
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90 field()->set_access_flags(flags);
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91 }
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92
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93 void set_access_flags(AccessFlags flags) const {
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94 set_access_flags(flags.as_short());
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95 }
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96
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97 Symbol* name() const {
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98 return field()->name(_constants);
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99 }
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100
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101 Symbol* signature() const {
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102 return field()->signature(_constants);
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103 }
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104
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105 Symbol* generic_signature() const {
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106 return field()->generic_signature(_constants);
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107 }
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108
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109 int offset() const {
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110 return field()->offset();
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111 }
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112
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113 void set_offset(int offset) {
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114 field()->set_offset(offset);
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115 }
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116 };
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117
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118 // Iterate over only the internal fields
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119 class JavaFieldStream : public FieldStreamBase {
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120 public:
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121 JavaFieldStream(instanceKlass* k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {}
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122 JavaFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {}
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123
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124 int name_index() const {
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125 assert(!field()->is_internal(), "regular only");
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126 return field()->name_index();
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127 }
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128 void set_name_index(int index) {
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129 assert(!field()->is_internal(), "regular only");
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130 field()->set_name_index(index);
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131 }
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132 int signature_index() const {
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133 assert(!field()->is_internal(), "regular only");
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134 return field()->signature_index();
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135 }
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136 void set_signature_index(int index) {
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137 assert(!field()->is_internal(), "regular only");
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138 field()->set_signature_index(index);
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139 }
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140 int generic_signature_index() const {
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141 assert(!field()->is_internal(), "regular only");
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142 return field()->generic_signature_index();
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143 }
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144 void set_generic_signature_index(int index) {
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145 assert(!field()->is_internal(), "regular only");
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146 field()->set_generic_signature_index(index);
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147 }
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148 int initval_index() const {
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149 assert(!field()->is_internal(), "regular only");
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150 return field()->initval_index();
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151 }
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152 void set_initval_index(int index) {
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153 assert(!field()->is_internal(), "regular only");
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154 return field()->set_initval_index(index);
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155 }
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156 };
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157
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158
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159 // Iterate over only the internal fields
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160 class InternalFieldStream : public FieldStreamBase {
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161 public:
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162 InternalFieldStream(instanceKlass* k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), k->all_fields_count()) {}
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163 InternalFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), k->all_fields_count()) {}
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164 };
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165
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166
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167 class AllFieldStream : public FieldStreamBase {
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168 public:
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169 AllFieldStream(typeArrayHandle fields, constantPoolHandle constants): FieldStreamBase(fields, constants) {}
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170 AllFieldStream(instanceKlass* k): FieldStreamBase(k->fields(), k->constants()) {}
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171 AllFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants()) {}
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172 };
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173
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174 #endif // SHARE_VM_OOPS_FIELDSTREAMS_HPP
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