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annotate src/dil/lexer/IdTable.d @ 820:1d06b4aed7cf

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Revised code in the first pass. Added code to handle anonymous unions and structs. Hope the idea will work. Added type to class Aggregate and isAnonymous to some other Symbol classes.
author Aziz K?ksal <aziz.koeksal@gmail.com>
date Fri, 14 Mar 2008 15:42:08 +0100
parents 372fa4fbbb1d
children
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1 /++
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2 Author: Aziz Köksal
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3 License: GPL3
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4 +/
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9f96fd51cb41 Moved dil.IdTable to dil.lexer.IdTable.
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5 module dil.lexer.IdTable;
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6
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7 import dil.lexer.TokensEnum;
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fc351756cc84 Moved dil.IdentsGenerator to dil.lexer.IdentsGenerator.
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8 import dil.lexer.IdentsGenerator;
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9 import dil.lexer.Keywords;
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10 import common;
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11
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041eae272362 Moved dil.Identifier to dil.lexer.Identifier.
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12 public import dil.lexer.Identifier;
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13 public import dil.lexer.IdentsEnum;
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9076c4cea2a4 Changed occur. of Token* to Identifier* and refactored Parser.
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15 /// A namespace for the predefined identifiers.
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16 struct Ident
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17 {
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18 const static
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19 {
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20 mixin(generateIdentMembers());
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21 }
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22
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23 static Identifier*[] allIds()
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24 {
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25 return __allIds;
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26 }
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27 }
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29 /// Global table for hoarding and retrieving identifiers.
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30 struct IdTable
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31 {
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32 static:
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33 /// A set of common, predefined identifiers for fast lookups.
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34 private Identifier*[string] staticTable;
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35 /// A table that grows with every newly found, unique identifier.
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36 private Identifier*[string] growingTable;
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37
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38 /// Loads keywords and predefined identifiers into the static table.
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39 static this()
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40 {
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41 foreach (ref k; g_reservedIds)
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42 staticTable[k.str] = &k;
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43 foreach (id; Ident.allIds())
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44 staticTable[id.str] = id;
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45 staticTable.rehash;
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46 }
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48 /// Looks up idString in both tables.
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49 Identifier* lookup(string idString)
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50 {
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51 auto id = inStatic(idString);
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52 if (id)
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53 return id;
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54 return inGrowing(idString);
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55 }
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56
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57 /// Looks up idString in the static table.
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58 Identifier* inStatic(string idString)
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59 {
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60 auto id = idString in staticTable;
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61 return id ? *id : null;
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62 }
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63
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64 alias Identifier* function(string idString) LookupFunction;
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65 /// Looks up idString in the growing table.
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66 LookupFunction inGrowing = &_inGrowing_unsafe; // Default to unsafe function.
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67
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68 /// Sets the thread safety mode of the growing table.
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69 void setThreadsafe(bool b)
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70 {
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71 if (b)
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72 inGrowing = &_inGrowing_safe;
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73 else
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74 inGrowing = &_inGrowing_unsafe;
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75 }
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76
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77 /// Returns true if access to the growing table is thread-safe.
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78 bool isThreadsafe()
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79 {
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80 return inGrowing is &_inGrowing_safe;
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81 }
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82
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83 /// Looks up idString in the table.
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84 ///
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85 /// Adds idString to the table if not found.
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86 private Identifier* _inGrowing_unsafe(string idString)
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87 out(id)
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88 { assert(id !is null); }
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89 body
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90 {
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91 auto id = idString in growingTable;
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92 if (id)
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93 return *id;
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94 auto newID = Identifier(idString, TOK.Identifier);
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95 growingTable[idString] = newID;
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96 return newID;
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97 }
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98
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99 /// Looks up idString in the table.
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100 ///
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101 /// Adds idString to the table if not found.
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102 /// Access to the data structure is synchronized.
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103 private Identifier* _inGrowing_safe(string idString)
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104 {
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105 synchronized
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106 return _inGrowing_unsafe(idString);
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107 }
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108
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109 /+
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110 Identifier* addIdentifiers(char[][] idStrings)
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111 {
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112 auto ids = new Identifier*[idStrings.length];
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113 foreach (i, idString; idStrings)
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114 {
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115 Identifier** id = idString in tabulatedIds;
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116 if (!id)
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117 {
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118 auto newID = Identifier(TOK.Identifier, idString);
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119 tabulatedIds[idString] = newID;
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120 id = &newID;
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121 }
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122 ids[i] = *id;
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123 }
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124 }
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125 +/
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126
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127 static uint anonCount; /// Counter for anonymous identifiers.
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128
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129 /// Generates an anonymous identifier.
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130 ///
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131 /// Concatenates prefix with anonCount.
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132 /// The identifier is not inserted into the table.
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133 Identifier* genAnonymousID(string prefix)
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134 {
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135 ++anonCount;
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136 auto x = anonCount;
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137 // Convert count to a string and append it to str.
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138 char[] num;
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139 do
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140 num = cast(char)('0' + (x % 10)) ~ num;
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141 while (x /= 10)
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142 return Identifier(prefix ~ num, TOK.Identifier);
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143 }
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144
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145 /// Generates an identifier for an anonymous enum.
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146 Identifier* genAnonEnumID()
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147 {
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148 return genAnonymousID("__anonenum");
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149 }
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150
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151 /// Generates an identifier for an anonymous class.
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152 Identifier* genAnonClassID()
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153 {
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154 return genAnonymousID("__anonclass");
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155 }
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156
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157 /// Generates an identifier for an anonymous struct.
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158 Identifier* genAnonStructID()
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159 {
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160 return genAnonymousID("__anonstruct");
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161 }
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162
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163 /// Generates an identifier for an anonymous union.
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164 Identifier* genAnonUnionID()
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165 {
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166 return genAnonymousID("__anonunion");
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167 }
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168
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169 /// Generates an identifier for a module which has got no valid name.
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170 Identifier* genModuleID()
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171 {
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172 return genAnonymousID("__module");
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173 }
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174 }
549
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175
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176 unittest
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177 {
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178 // TODO: write benchmark.
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179 // Single table
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180
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181 // Single table. synchronized
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182
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183 // Two tables.
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184
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185 // Two tables. synchronized
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186 }