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annotate src/share/vm/oops/fieldStreams.hpp @ 6862:8a5ea0a9ccc4

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7127708: G1: change task num types from int to uint in concurrent mark Summary: Change the type of various task num fields, parameters etc to unsigned and rename them to be more consistent with the other collectors. Code changes were also reviewed by Vitaly Davidovich. Reviewed-by: johnc Contributed-by: Kaushik Srenevasan <kaushik@twitter.com>
author johnc
date Sat, 06 Oct 2012 01:17:44 -0700
parents da91efe96a93
children 4a916f2ce331
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1 /*
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2 * Copyright (c) 2011, 2012, 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 Array<u2>* _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 int _generic_signature_slot;
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46
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47 FieldInfo* field() const { return FieldInfo::from_field_array(_fields, _index); }
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48
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49 int init_generic_signature_start_slot() {
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50 int length = _fields->length();
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51 int num_fields = 0;
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52 int skipped_generic_signature_slots = 0;
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53 FieldInfo* fi;
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54 AccessFlags flags;
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55 /* Scan from 0 to the current _index. Count the number of generic
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56 signature slots for field[0] to field[_index - 1]. */
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57 for (int i = 0; i < _index; i++) {
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58 fi = FieldInfo::from_field_array(_fields, i);
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59 flags.set_flags(fi->access_flags());
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60 if (flags.field_has_generic_signature()) {
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61 length --;
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62 skipped_generic_signature_slots ++;
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63 }
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64 }
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65 /* Scan from the current _index. */
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66 for (int i = _index; i*FieldInfo::field_slots < length; i++) {
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67 fi = FieldInfo::from_field_array(_fields, i);
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68 flags.set_flags(fi->access_flags());
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69 if (flags.field_has_generic_signature()) {
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70 length --;
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71 }
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72 num_fields ++;
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73 }
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74 _generic_signature_slot = length + skipped_generic_signature_slots;
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75 assert(_generic_signature_slot <= _fields->length(), "");
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76 return num_fields;
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77 }
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78
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79 FieldStreamBase(Array<u2>* fields, constantPoolHandle constants, int start, int limit) {
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80 _fields = fields;
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81 _constants = constants;
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82 _index = start;
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83 int num_fields = init_generic_signature_start_slot();
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84 if (limit < start) {
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85 _limit = num_fields;
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86 } else {
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87 _limit = limit;
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88 }
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89 }
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90
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91 FieldStreamBase(Array<u2>* fields, constantPoolHandle constants) {
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92 _fields = fields;
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93 _constants = constants;
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94 _index = 0;
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95 _limit = init_generic_signature_start_slot();
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96 }
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97
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98 public:
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99 FieldStreamBase(InstanceKlass* klass) {
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100 _fields = klass->fields();
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101 _constants = klass->constants();
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102 _index = 0;
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103 _limit = klass->java_fields_count();
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104 init_generic_signature_start_slot();
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105 }
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106 FieldStreamBase(instanceKlassHandle klass) {
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107 _fields = klass->fields();
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108 _constants = klass->constants();
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109 _index = 0;
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110 _limit = klass->java_fields_count();
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111 init_generic_signature_start_slot();
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112 }
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113
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114 // accessors
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115 int index() const { return _index; }
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116
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117 void next() {
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118 if (access_flags().field_has_generic_signature()) {
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119 _generic_signature_slot ++;
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120 assert(_generic_signature_slot <= _fields->length(), "");
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121 }
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122 _index += 1;
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123 }
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124 bool done() const { return _index >= _limit; }
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125
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126 // Accessors for current field
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127 AccessFlags access_flags() const {
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128 AccessFlags flags;
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129 flags.set_flags(field()->access_flags());
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130 return flags;
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131 }
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132
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133 void set_access_flags(u2 flags) const {
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134 field()->set_access_flags(flags);
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135 }
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136
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137 void set_access_flags(AccessFlags flags) const {
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138 set_access_flags(flags.as_short());
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139 }
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140
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141 Symbol* name() const {
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142 return field()->name(_constants);
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143 }
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144
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145 Symbol* signature() const {
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146 return field()->signature(_constants);
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147 }
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148
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149 Symbol* generic_signature() const {
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150 if (access_flags().field_has_generic_signature()) {
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151 assert(_generic_signature_slot < _fields->length(), "out of bounds");
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152 int index = _fields->at(_generic_signature_slot);
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153 return _constants->symbol_at(index);
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154 } else {
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155 return NULL;
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156 }
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157 }
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158
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159 int offset() const {
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160 return field()->offset();
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161 }
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162
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163 void set_offset(int offset) {
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164 field()->set_offset(offset);
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165 }
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166 };
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167
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168 // Iterate over only the internal fields
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169 class JavaFieldStream : public FieldStreamBase {
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170 public:
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171 JavaFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {}
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172
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173 int name_index() const {
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174 assert(!field()->is_internal(), "regular only");
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175 return field()->name_index();
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176 }
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177 void set_name_index(int index) {
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178 assert(!field()->is_internal(), "regular only");
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179 field()->set_name_index(index);
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180 }
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181 int signature_index() const {
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182 assert(!field()->is_internal(), "regular only");
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183 return field()->signature_index();
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184 }
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185 void set_signature_index(int index) {
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186 assert(!field()->is_internal(), "regular only");
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187 field()->set_signature_index(index);
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188 }
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189 int generic_signature_index() const {
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190 assert(!field()->is_internal(), "regular only");
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191 if (access_flags().field_has_generic_signature()) {
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192 assert(_generic_signature_slot < _fields->length(), "out of bounds");
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193 return _fields->at(_generic_signature_slot);
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194 } else {
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195 return 0;
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196 }
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197 }
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198 void set_generic_signature_index(int index) {
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199 assert(!field()->is_internal(), "regular only");
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200 if (access_flags().field_has_generic_signature()) {
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201 assert(_generic_signature_slot < _fields->length(), "out of bounds");
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202 _fields->at_put(_generic_signature_slot, index);
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203 }
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204 }
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205 int initval_index() const {
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206 assert(!field()->is_internal(), "regular only");
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207 return field()->initval_index();
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208 }
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209 void set_initval_index(int index) {
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210 assert(!field()->is_internal(), "regular only");
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211 return field()->set_initval_index(index);
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212 }
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213 };
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214
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215
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216 // Iterate over only the internal fields
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217 class InternalFieldStream : public FieldStreamBase {
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218 public:
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219 InternalFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {}
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220 InternalFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {}
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221 };
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222
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223
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224 class AllFieldStream : public FieldStreamBase {
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225 public:
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226 AllFieldStream(Array<u2>* fields, constantPoolHandle constants): FieldStreamBase(fields, constants) {}
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227 AllFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants()) {}
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228 AllFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants()) {}
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229 };
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230
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231 #endif // SHARE_VM_OOPS_FIELDSTREAMS_HPP