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annotate src/share/vm/oops/fieldStreams.hpp @ 12264:b2e698d2276c

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8014013: CallInfo structure no longer accurately reports the result of a LinkResolver operation Summary: Enhance method resolution and resulting data structures, plus some refactoring. Reviewed-by: twisti, acorn, jrose
author drchase
date Fri, 13 Sep 2013 22:38:02 -0400
parents 4a916f2ce331
children
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1 /*
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2 * Copyright (c) 2011, 2013, 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 #include "runtime/fieldDescriptor.hpp"
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31
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32 // The is the base class for iteration over the fields array
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33 // describing the declared fields in the class. Several subclasses
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34 // are provided depending on the kind of iteration required. The
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35 // JavaFieldStream is for iterating over regular Java fields and it
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36 // generally the preferred iterator. InternalFieldStream only
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37 // iterates over fields that have been injected by the JVM.
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38 // AllFieldStream exposes all fields and should only be used in rare
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39 // cases.
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40 class FieldStreamBase : public StackObj {
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41 protected:
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42 Array<u2>* _fields;
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43 constantPoolHandle _constants;
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44 int _index;
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45 int _limit;
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46 int _generic_signature_slot;
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47 fieldDescriptor _fd_buf;
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48
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49 FieldInfo* field() const { return FieldInfo::from_field_array(_fields, _index); }
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50 InstanceKlass* field_holder() const { return _constants->pool_holder(); }
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51
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52 int init_generic_signature_start_slot() {
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53 int length = _fields->length();
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54 int num_fields = 0;
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55 int skipped_generic_signature_slots = 0;
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56 FieldInfo* fi;
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57 AccessFlags flags;
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58 /* Scan from 0 to the current _index. Count the number of generic
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59 signature slots for field[0] to field[_index - 1]. */
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60 for (int i = 0; i < _index; i++) {
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61 fi = FieldInfo::from_field_array(_fields, i);
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62 flags.set_flags(fi->access_flags());
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63 if (flags.field_has_generic_signature()) {
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64 length --;
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65 skipped_generic_signature_slots ++;
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66 }
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67 }
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68 /* Scan from the current _index. */
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69 for (int i = _index; i*FieldInfo::field_slots < length; i++) {
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70 fi = FieldInfo::from_field_array(_fields, i);
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71 flags.set_flags(fi->access_flags());
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72 if (flags.field_has_generic_signature()) {
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73 length --;
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74 }
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75 num_fields ++;
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76 }
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77 _generic_signature_slot = length + skipped_generic_signature_slots;
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78 assert(_generic_signature_slot <= _fields->length(), "");
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79 return num_fields;
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80 }
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81
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82 FieldStreamBase(Array<u2>* fields, constantPoolHandle constants, int start, int limit) {
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83 _fields = fields;
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84 _constants = constants;
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85 _index = start;
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86 int num_fields = init_generic_signature_start_slot();
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87 if (limit < start) {
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88 _limit = num_fields;
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89 } else {
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90 _limit = limit;
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91 }
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92 }
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93
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94 FieldStreamBase(Array<u2>* fields, constantPoolHandle constants) {
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95 _fields = fields;
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96 _constants = constants;
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97 _index = 0;
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98 _limit = init_generic_signature_start_slot();
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99 }
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100
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101 public:
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102 FieldStreamBase(InstanceKlass* klass) {
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103 _fields = klass->fields();
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104 _constants = klass->constants();
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105 _index = 0;
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106 _limit = klass->java_fields_count();
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107 init_generic_signature_start_slot();
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108 assert(klass == field_holder(), "");
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109 }
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110 FieldStreamBase(instanceKlassHandle klass) {
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111 _fields = klass->fields();
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112 _constants = klass->constants();
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113 _index = 0;
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114 _limit = klass->java_fields_count();
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115 init_generic_signature_start_slot();
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116 assert(klass == field_holder(), "");
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117 }
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118
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119 // accessors
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120 int index() const { return _index; }
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121
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122 void next() {
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123 if (access_flags().field_has_generic_signature()) {
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124 _generic_signature_slot ++;
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125 assert(_generic_signature_slot <= _fields->length(), "");
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126 }
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127 _index += 1;
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128 }
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129 bool done() const { return _index >= _limit; }
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130
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131 // Accessors for current field
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132 AccessFlags access_flags() const {
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133 AccessFlags flags;
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134 flags.set_flags(field()->access_flags());
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135 return flags;
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136 }
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137
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138 void set_access_flags(u2 flags) const {
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139 field()->set_access_flags(flags);
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140 }
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141
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142 void set_access_flags(AccessFlags flags) const {
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143 set_access_flags(flags.as_short());
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144 }
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145
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146 Symbol* name() const {
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147 return field()->name(_constants);
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148 }
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149
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150 Symbol* signature() const {
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151 return field()->signature(_constants);
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152 }
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153
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154 Symbol* generic_signature() const {
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155 if (access_flags().field_has_generic_signature()) {
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156 assert(_generic_signature_slot < _fields->length(), "out of bounds");
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157 int index = _fields->at(_generic_signature_slot);
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158 return _constants->symbol_at(index);
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159 } else {
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160 return NULL;
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161 }
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162 }
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163
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164 int offset() const {
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165 return field()->offset();
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166 }
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167
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168 int allocation_type() const {
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169 return field()->allocation_type();
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170 }
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171
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172 void set_offset(int offset) {
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173 field()->set_offset(offset);
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174 }
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175
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176 bool is_offset_set() const {
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177 return field()->is_offset_set();
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178 }
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179
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180 bool is_contended() const {
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181 return field()->is_contended();
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182 }
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183
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184 int contended_group() const {
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185 return field()->contended_group();
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186 }
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187
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188 // bridge to a heavier API:
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189 fieldDescriptor& field_descriptor() const {
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190 fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf);
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191 field.reinitialize(field_holder(), _index);
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192 return field;
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193 }
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194 };
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195
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196 // Iterate over only the internal fields
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197 class JavaFieldStream : public FieldStreamBase {
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198 public:
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199 JavaFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {}
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200
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201 int name_index() const {
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202 assert(!field()->is_internal(), "regular only");
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203 return field()->name_index();
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204 }
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205 void set_name_index(int index) {
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206 assert(!field()->is_internal(), "regular only");
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207 field()->set_name_index(index);
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208 }
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209 int signature_index() const {
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210 assert(!field()->is_internal(), "regular only");
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211 return field()->signature_index();
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212 }
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213 void set_signature_index(int index) {
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214 assert(!field()->is_internal(), "regular only");
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215 field()->set_signature_index(index);
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216 }
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217 int generic_signature_index() const {
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218 assert(!field()->is_internal(), "regular only");
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219 if (access_flags().field_has_generic_signature()) {
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220 assert(_generic_signature_slot < _fields->length(), "out of bounds");
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221 return _fields->at(_generic_signature_slot);
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222 } else {
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223 return 0;
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224 }
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225 }
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226 void set_generic_signature_index(int index) {
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227 assert(!field()->is_internal(), "regular only");
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228 if (access_flags().field_has_generic_signature()) {
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229 assert(_generic_signature_slot < _fields->length(), "out of bounds");
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230 _fields->at_put(_generic_signature_slot, index);
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231 }
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232 }
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233 int initval_index() const {
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234 assert(!field()->is_internal(), "regular only");
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235 return field()->initval_index();
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236 }
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237 void set_initval_index(int index) {
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238 assert(!field()->is_internal(), "regular only");
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239 return field()->set_initval_index(index);
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240 }
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241 };
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242
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243
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244 // Iterate over only the internal fields
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245 class InternalFieldStream : public FieldStreamBase {
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246 public:
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247 InternalFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {}
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248 InternalFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {}
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249 };
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250
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251
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252 class AllFieldStream : public FieldStreamBase {
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253 public:
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254 AllFieldStream(Array<u2>* fields, constantPoolHandle constants): FieldStreamBase(fields, constants) {}
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255 AllFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants()) {}
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256 AllFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants()) {}
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257 };
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258
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259 #endif // SHARE_VM_OOPS_FIELDSTREAMS_HPP