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1 /* |
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2 * Copyright (c) 2011, 2015, 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/constantPool.hpp" |
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29 #include "oops/typeArrayOop.hpp" |
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30 #include "classfile/vmSymbols.hpp" |
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31 |
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32 // This class represents the field information contained in the fields |
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33 // array of an InstanceKlass. Currently it's laid on top an array of |
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34 // Java shorts but in the future it could simply be used as a real |
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35 // array type. FieldInfo generally shouldn't be used directly. |
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36 // Fields should be queried either through InstanceKlass or through |
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37 // the various FieldStreams. |
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38 class FieldInfo VALUE_OBJ_CLASS_SPEC { |
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39 friend class fieldDescriptor; |
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40 friend class JavaFieldStream; |
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41 friend class ClassFileParser; |
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42 |
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43 public: |
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44 // fields |
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45 // Field info extracted from the class file and stored |
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46 // as an array of 6 shorts. |
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47 |
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48 #define FIELDINFO_TAG_SIZE 2 |
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49 #define FIELDINFO_TAG_BLANK 0 |
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50 #define FIELDINFO_TAG_OFFSET 1 |
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51 #define FIELDINFO_TAG_TYPE_PLAIN 2 |
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52 #define FIELDINFO_TAG_TYPE_CONTENDED 3 |
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53 #define FIELDINFO_TAG_MASK 3 |
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54 |
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55 // Packed field has the tag, and can be either of: |
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56 // hi bits <--------------------------- lo bits |
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57 // |---------high---------|---------low---------| |
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58 // ..........................................00 - blank |
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59 // [------------------offset----------------]01 - real field offset |
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60 // ......................[-------type-------]10 - plain field with type |
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61 // [--contention_group--][-------type-------]11 - contended field with type and contention group |
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62 enum FieldOffset { |
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63 access_flags_offset = 0, |
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64 name_index_offset = 1, |
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65 signature_index_offset = 2, |
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66 initval_index_offset = 3, |
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67 low_packed_offset = 4, |
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68 high_packed_offset = 5, |
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69 field_slots = 6 |
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70 }; |
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71 |
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72 private: |
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73 u2 _shorts[field_slots]; |
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74 |
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75 void set_name_index(u2 val) { _shorts[name_index_offset] = val; } |
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76 void set_signature_index(u2 val) { _shorts[signature_index_offset] = val; } |
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77 void set_initval_index(u2 val) { _shorts[initval_index_offset] = val; } |
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78 |
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79 u2 name_index() const { return _shorts[name_index_offset]; } |
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80 u2 signature_index() const { return _shorts[signature_index_offset]; } |
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81 u2 initval_index() const { return _shorts[initval_index_offset]; } |
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82 |
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83 public: |
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84 static FieldInfo* from_field_array(Array<u2>* fields, int index) { |
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85 return ((FieldInfo*)fields->adr_at(index * field_slots)); |
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86 } |
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87 static FieldInfo* from_field_array(u2* fields, int index) { |
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88 return ((FieldInfo*)(fields + index * field_slots)); |
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89 } |
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90 |
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91 void initialize(u2 access_flags, |
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92 u2 name_index, |
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93 u2 signature_index, |
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94 u2 initval_index) { |
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95 _shorts[access_flags_offset] = access_flags; |
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96 _shorts[name_index_offset] = name_index; |
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97 _shorts[signature_index_offset] = signature_index; |
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98 _shorts[initval_index_offset] = initval_index; |
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99 _shorts[low_packed_offset] = 0; |
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100 _shorts[high_packed_offset] = 0; |
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101 } |
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102 |
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103 u2 access_flags() const { return _shorts[access_flags_offset]; } |
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104 u4 offset() const { |
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105 u2 lo = _shorts[low_packed_offset]; |
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106 switch(lo & FIELDINFO_TAG_MASK) { |
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107 case FIELDINFO_TAG_OFFSET: |
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108 return build_int_from_shorts(_shorts[low_packed_offset], _shorts[high_packed_offset]) >> FIELDINFO_TAG_SIZE; |
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109 #ifndef PRODUCT |
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110 case FIELDINFO_TAG_TYPE_PLAIN: |
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111 fatal("Asking offset for the plain type field"); |
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112 case FIELDINFO_TAG_TYPE_CONTENDED: |
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113 fatal("Asking offset for the contended type field"); |
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114 case FIELDINFO_TAG_BLANK: |
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115 fatal("Asking offset for the blank field"); |
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116 #endif |
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117 } |
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118 ShouldNotReachHere(); |
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119 return 0; |
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120 } |
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121 |
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122 bool is_contended() const { |
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123 u2 lo = _shorts[low_packed_offset]; |
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124 switch(lo & FIELDINFO_TAG_MASK) { |
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125 case FIELDINFO_TAG_TYPE_PLAIN: |
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126 return false; |
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127 case FIELDINFO_TAG_TYPE_CONTENDED: |
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128 return true; |
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129 #ifndef PRODUCT |
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130 case FIELDINFO_TAG_OFFSET: |
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131 fatal("Asking contended flag for the field with offset"); |
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132 case FIELDINFO_TAG_BLANK: |
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133 fatal("Asking contended flag for the blank field"); |
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134 #endif |
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135 } |
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136 ShouldNotReachHere(); |
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137 return false; |
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138 } |
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139 |
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140 u2 contended_group() const { |
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141 u2 lo = _shorts[low_packed_offset]; |
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142 switch(lo & FIELDINFO_TAG_MASK) { |
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143 case FIELDINFO_TAG_TYPE_PLAIN: |
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144 return 0; |
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145 case FIELDINFO_TAG_TYPE_CONTENDED: |
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146 return _shorts[high_packed_offset]; |
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147 #ifndef PRODUCT |
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148 case FIELDINFO_TAG_OFFSET: |
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149 fatal("Asking the contended group for the field with offset"); |
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150 case FIELDINFO_TAG_BLANK: |
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151 fatal("Asking the contended group for the blank field"); |
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152 #endif |
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153 } |
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154 ShouldNotReachHere(); |
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155 return 0; |
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156 } |
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157 |
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158 u2 allocation_type() const { |
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159 u2 lo = _shorts[low_packed_offset]; |
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160 switch(lo & FIELDINFO_TAG_MASK) { |
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161 case FIELDINFO_TAG_TYPE_PLAIN: |
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162 case FIELDINFO_TAG_TYPE_CONTENDED: |
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163 return (lo >> FIELDINFO_TAG_SIZE); |
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164 #ifndef PRODUCT |
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165 case FIELDINFO_TAG_OFFSET: |
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166 fatal("Asking the field type for field with offset"); |
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167 case FIELDINFO_TAG_BLANK: |
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168 fatal("Asking the field type for the blank field"); |
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169 #endif |
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170 } |
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171 ShouldNotReachHere(); |
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172 return 0; |
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173 } |
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174 |
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175 bool is_offset_set() const { |
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176 return (_shorts[low_packed_offset] & FIELDINFO_TAG_MASK) == FIELDINFO_TAG_OFFSET; |
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177 } |
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178 |
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179 Symbol* name(const constantPoolHandle& cp) const { |
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180 int index = name_index(); |
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181 if (is_internal()) { |
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182 return lookup_symbol(index); |
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183 } |
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184 return cp->symbol_at(index); |
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185 } |
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186 |
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187 Symbol* signature(const constantPoolHandle& cp) const { |
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188 int index = signature_index(); |
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189 if (is_internal()) { |
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190 return lookup_symbol(index); |
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191 } |
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192 return cp->symbol_at(index); |
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193 } |
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194 |
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195 void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; } |
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196 void set_offset(u4 val) { |
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197 val = val << FIELDINFO_TAG_SIZE; // make room for tag |
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198 _shorts[low_packed_offset] = extract_low_short_from_int(val) | FIELDINFO_TAG_OFFSET; |
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199 _shorts[high_packed_offset] = extract_high_short_from_int(val); |
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200 } |
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201 |
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202 void set_allocation_type(int type) { |
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203 u2 lo = _shorts[low_packed_offset]; |
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204 switch(lo & FIELDINFO_TAG_MASK) { |
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205 case FIELDINFO_TAG_BLANK: |
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206 _shorts[low_packed_offset] = ((type << FIELDINFO_TAG_SIZE)) & 0xFFFF; |
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207 _shorts[low_packed_offset] &= ~FIELDINFO_TAG_MASK; |
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208 _shorts[low_packed_offset] |= FIELDINFO_TAG_TYPE_PLAIN; |
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209 return; |
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210 #ifndef PRODUCT |
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211 case FIELDINFO_TAG_TYPE_PLAIN: |
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212 case FIELDINFO_TAG_TYPE_CONTENDED: |
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213 case FIELDINFO_TAG_OFFSET: |
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214 fatal("Setting the field type with overwriting"); |
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215 #endif |
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216 } |
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217 ShouldNotReachHere(); |
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218 } |
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219 |
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220 void set_contended_group(u2 val) { |
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221 u2 lo = _shorts[low_packed_offset]; |
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222 switch(lo & FIELDINFO_TAG_MASK) { |
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223 case FIELDINFO_TAG_TYPE_PLAIN: |
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224 _shorts[low_packed_offset] |= FIELDINFO_TAG_TYPE_CONTENDED; |
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225 _shorts[high_packed_offset] = val; |
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226 return; |
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227 #ifndef PRODUCT |
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228 case FIELDINFO_TAG_TYPE_CONTENDED: |
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229 fatal("Overwriting contended group"); |
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230 case FIELDINFO_TAG_BLANK: |
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231 fatal("Setting contended group for the blank field"); |
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232 case FIELDINFO_TAG_OFFSET: |
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233 fatal("Setting contended group for field with offset"); |
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234 #endif |
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235 } |
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236 ShouldNotReachHere(); |
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237 } |
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238 |
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239 bool is_internal() const { |
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240 return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0; |
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241 } |
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242 |
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243 bool is_stable() const { |
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244 return (access_flags() & JVM_ACC_FIELD_STABLE) != 0; |
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245 } |
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246 void set_stable(bool z) { |
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247 if (z) _shorts[access_flags_offset] |= JVM_ACC_FIELD_STABLE; |
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248 else _shorts[access_flags_offset] &= ~JVM_ACC_FIELD_STABLE; |
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249 } |
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250 |
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251 Symbol* lookup_symbol(int symbol_index) const { |
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252 assert(is_internal(), "only internal fields"); |
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253 return vmSymbols::symbol_at((vmSymbols::SID)symbol_index); |
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254 } |
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255 }; |
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256 |
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257 #endif // SHARE_VM_OOPS_FIELDINFO_HPP |