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1 module dmd.EnumDeclaration;
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2
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3 import dmd.ScopeDsymbol;
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4 import dmd.AddExp;
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5 import dmd.Type;
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6 import dmd.CmpExp;
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7 import dmd.IntegerExp;
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8 import dmd.EqualExp;
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9 import dmd.TOK;
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10 import dmd.Id;
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11 import dmd.TY;
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12 import dmd.DsymbolTable;
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13 import dmd.STC;
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14 import dmd.Expression;
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15 import dmd.Identifier;
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16 import dmd.Dsymbol;
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17 import dmd.Scope;
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18 import dmd.OutBuffer;
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19 import dmd.HdrGenState;
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20 import dmd.Global;
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21 import dmd.Loc;
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22 import dmd.TypeEnum;
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23 import dmd.EnumMember;
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24 import dmd.DYNCAST;
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25 import dmd.WANT;
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26 import dmd.Id;
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27 import dmd.Lexer;
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28
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29 import dmd.backend.SC;
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30 import dmd.backend.FL;
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31 import dmd.backend.Util;
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32 import dmd.backend.Symbol;
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33 import dmd.backend.Classsym;
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34 import dmd.backend.SFL;
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35 import dmd.backend.LIST;
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36 import dmd.codegen.Util;
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37
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38 import std.stdio : writef;
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39
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40 class EnumDeclaration : ScopeDsymbol
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41 { /* enum ident : memtype { ... }
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42 */
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43 Type type; // the TypeEnum
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44 Type memtype; // type of the members
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45
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46 version (DMDV1) {
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47 ulong maxval;
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48 ulong minval;
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49 ulong defaultval; // default initializer
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50 } else {
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51 Expression maxval;
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52 Expression minval;
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53 Expression defaultval; // default initializer
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54 }
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55 bool isdeprecated;
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56
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57 this(Loc loc, Identifier id, Type memtype)
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58 {
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59 super(id);
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60 this.loc = loc;
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61 type = new TypeEnum(this);
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62 this.memtype = memtype;
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63 }
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64
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65 Dsymbol syntaxCopy(Dsymbol s)
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66 {
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67 assert(false);
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68 }
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69
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70 void semantic(Scope sc)
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71 {
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72 Type t;
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73 Scope sce;
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74
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75 //writef("EnumDeclaration.semantic(sd = %p, '%s') %s\n", sc.scopesym, sc.scopesym.toChars(), toChars());
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76 //writef("EnumDeclaration.semantic() %s\n", toChars());
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77 if (!members) // enum ident;
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78 return;
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79
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80 if (!memtype && !isAnonymous())
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81 {
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82 // Set memtype if we can to reduce fwd reference errors
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83 memtype = Type.tint32; // case 1) enum ident { ... }
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84 }
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85
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86 if (symtab) // if already done
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87 {
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88 if (!scope_)
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89 return; // semantic() already completed
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90 }
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91 else
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92 symtab = new DsymbolTable();
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93
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94 Scope scx = null;
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95 if (scope_)
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96 { sc = scope_;
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97 scx = scope_; // save so we don't make redundant copies
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98 scope_ = null;
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99 }
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100
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101 if (sc.stc & STC.STCdeprecated)
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102 isdeprecated = true;
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103
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104 parent = sc.parent;
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105
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106 /* The separate, and distinct, cases are:
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107 * 1. enum { ... }
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108 * 2. enum : memtype { ... }
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109 * 3. enum ident { ... }
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110 * 4. enum ident : memtype { ... }
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111 */
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112
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113 if (memtype)
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114 {
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115 memtype = memtype.semantic(loc, sc);
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116
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117 /* Check to see if memtype is forward referenced
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118 */
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119 if (memtype.ty == TY.Tenum)
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120 { EnumDeclaration sym = cast(EnumDeclaration)memtype.toDsymbol(sc);
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121 if (!sym.memtype || !sym.members || !sym.symtab || sym.scope_)
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122 {
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123 // memtype is forward referenced, so try again later
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124 scope_ = scx ? scx : new Scope(sc);
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125 scope_.setNoFree();
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126 scope_.module_.addDeferredSemantic(this);
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127 writef("\tdeferring %s\n", toChars());
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128 return;
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129 }
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130 }
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131 static if (false) {
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132 // Decided to abandon this restriction for D 2.0
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133 if (!memtype.isintegral())
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134 { error("base type must be of integral type, not %s", memtype.toChars());
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135 memtype = Type.tint32;
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136 }
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137 }
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138 }
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139
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140 type = type.semantic(loc, sc);
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141 if (isAnonymous())
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142 sce = sc;
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143 else
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144 { sce = sc.push(this);
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145 sce.parent = this;
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146 }
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147 if (members.dim == 0)
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148 error("enum %s must have at least one member", toChars());
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149 int first = 1;
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150 Expression elast = null;
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151 for (int i = 0; i < members.dim; i++)
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152 {
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153 EnumMember em = (cast(Dsymbol)members.data[i]).isEnumMember();
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154 Expression e;
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155
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156 if (!em)
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157 /* The e.semantic(sce) can insert other symbols, such as
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158 * template instances and function literals.
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159 */
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160 continue;
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161
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162 //printf(" Enum member '%s'\n",em.toChars());
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163 if (em.type)
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164 em.type = em.type.semantic(em.loc, sce);
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165 e = em.value;
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166 if (e)
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167 {
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168 assert(e.dyncast() == DYNCAST.DYNCAST_EXPRESSION);
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169 e = e.semantic(sce);
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170 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
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171 if (memtype)
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172 {
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173 e = e.implicitCastTo(sce, memtype);
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174 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
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175 if (!isAnonymous())
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176 e = e.castTo(sce, type);
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177 t = memtype;
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178 }
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179 else if (em.type)
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180 {
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181 e = e.implicitCastTo(sce, em.type);
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182 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
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183 assert(isAnonymous());
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184 t = e.type;
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185 }
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186 else
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187 t = e.type;
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188 }
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189 else if (first)
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190 {
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191 if (memtype)
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192 t = memtype;
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193 else if (em.type)
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194 t = em.type;
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195 else
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196 t = Type.tint32;
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197 e = new IntegerExp(em.loc, 0, Type.tint32);
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198 e = e.implicitCastTo(sce, t);
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199 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
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200 if (!isAnonymous())
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201 e = e.castTo(sce, type);
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202 }
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203 else
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204 {
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205 // Set value to (elast + 1).
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206 // But first check that (elast != t.max)
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207 assert(elast);
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208 e = new EqualExp(TOK.TOKequal, em.loc, elast, t.getProperty(Loc(0), Id.max));
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209 e = e.semantic(sce);
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210 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
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211 if (e.toInteger())
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212 error("overflow of enum value %s", elast.toChars());
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213
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214 // Now set e to (elast + 1)
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215 e = new AddExp(em.loc, elast, new IntegerExp(em.loc, 1, Type.tint32));
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216 e = e.semantic(sce);
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217 e = e.castTo(sce, elast.type);
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218 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
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219 }
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220 elast = e;
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221 em.value = e;
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222
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223 // Add to symbol table only after evaluating 'value'
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224 if (isAnonymous())
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225 {
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226 /* Anonymous enum members get added to enclosing scope.
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227 */
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228 for (Scope scxx = sce; scxx; scxx = scxx.enclosing)
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229 {
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230 if (scxx.scopesym)
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231 {
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232 if (!scxx.scopesym.symtab)
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233 scxx.scopesym.symtab = new DsymbolTable();
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234 em.addMember(sce, scxx.scopesym, 1);
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235 break;
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236 }
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237 }
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238 }
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239 else
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240 em.addMember(sc, this, 1);
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241
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242 /* Compute .min, .max and .default values.
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243 * If enum doesn't have a name, we can never identify the enum type,
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244 * so there is no purpose for a .min, .max or .default
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245 */
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246 if (!isAnonymous())
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247 {
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248 if (first)
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249 { defaultval = e;
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250 minval = e;
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251 maxval = e;
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252 }
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253 else
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254 { Expression ec;
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255
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256 /* In order to work successfully with UDTs,
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257 * build expressions to do the comparisons,
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258 * and let the semantic analyzer and constant
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259 * folder give us the result.
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260 */
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261
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262 // Compute if(e < minval)
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263 ec = new CmpExp(TOK.TOKlt, em.loc, e, minval);
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264 ec = ec.semantic(sce);
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265 ec = ec.optimize(WANT.WANTvalue | WANT.WANTinterpret);
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266 if (ec.toInteger())
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267 minval = e;
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268
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269 ec = new CmpExp(TOK.TOKgt, em.loc, e, maxval);
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270 ec = ec.semantic(sce);
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271 ec = ec.optimize(WANT.WANTvalue | WANT.WANTinterpret);
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272 if (ec.toInteger())
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273 maxval = e;
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274 }
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275 }
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276 first = 0;
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277 }
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278 //printf("defaultval = %lld\n", defaultval);
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279
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280 //if (defaultval) printf("defaultval: %s %s\n", defaultval.toChars(), defaultval.type.toChars());
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281 if (sc != sce)
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282 sce.pop();
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283 //members.print();
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284 }
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285
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286 bool oneMember(Dsymbol* ps)
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287 {
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288 assert(false);
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289 }
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290
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291 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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292 {
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293 assert(false);
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294 }
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295
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296 Type getType()
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297 {
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298 return type;
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299 }
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300
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301 string kind()
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302 {
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303 return "enum";
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304 }
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305
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306 version (DMDV2) {
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307 Dsymbol search(Loc, Identifier ident, int flags)
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308 {
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309 //printf("%s.EnumDeclaration::search('%s')\n", toChars(), ident->toChars());
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310 if (scope_)
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311 // Try one last time to resolve this enum
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312 semantic(scope_);
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313
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314 if (!members || !symtab || scope_)
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315 {
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316 error("is forward referenced when looking for '%s'", ident.toChars());
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317 //*(char*)0=0;
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318 return null;
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319 }
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320
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321 return ScopeDsymbol.search(loc, ident, flags);
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322 }
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323 }
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324 bool isDeprecated() // is Dsymbol deprecated?
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325 {
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326 return isdeprecated;
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327 }
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328
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329 void emitComment(Scope sc)
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330 {
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331 assert(false);
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332 }
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333
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334 void toDocBuffer(OutBuffer buf)
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335 {
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336 assert(false);
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337 }
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338
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339 EnumDeclaration isEnumDeclaration() { return this; }
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340
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341 void toObjFile(int multiobj) // compile to .obj file
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342 {
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343 //printf("EnumDeclaration::toObjFile('%s')\n", toChars());
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344 version (DMDV2) {
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345 if (isAnonymous())
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346 return;
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347 }
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348
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349 if (global.params.symdebug)
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350 toDebug();
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351
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352 type.getTypeInfo(null); // generate TypeInfo
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353
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354 TypeEnum tc = cast(TypeEnum)type;
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355 if (!tc.sym.defaultval || type.isZeroInit(Loc(0))) {
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356 ;
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357 } else {
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358 SC scclass = SCglobal;
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359 if (inTemplateInstance())
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360 scclass = SCcomdat;
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361
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362 // Generate static initializer
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363 toInitializer();
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364 sinit.Sclass = scclass;
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365 sinit.Sfl = FLdata;
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366 version (ELFOBJ) { // Burton
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367 sinit.Sseg = Segment.CDATA;
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368 }
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369 version (MACHOBJ) {
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370 sinit.Sseg = Segment.DATA;
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371 }
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372 version (DMDV1) {
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373 dtnbytes(&sinit.Sdt, tc.size(0), cast(char*)&tc.sym.defaultval);
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374 //sinit->Sdt = tc->sym->init->toDt();
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375 }
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376 version (DMDV2) {
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377 tc.sym.defaultval.toDt(&sinit.Sdt);
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378 }
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379 outdata(sinit);
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380 }
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381 }
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382
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383 void toDebug()
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384 {
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385 assert(false);
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386 }
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387
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388 int cvMember(ubyte* p)
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389 {
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390 assert(false);
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391 }
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392
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393 Symbol* sinit;
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394
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395 Symbol* toInitializer()
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396 {
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397 Symbol* s;
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398 Classsym* stag;
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399
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400 if (!sinit)
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401 {
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402 stag = fake_classsym(Id.ClassInfo);
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403 Identifier ident_save = ident;
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404 if (!ident)
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405 ident = Lexer.uniqueId("__enum");
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406 s = toSymbolX("__init", SCextern, stag.Stype, "Z");
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407 ident = ident_save;
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408 s.Sfl = FLextern;
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409 s.Sflags |= SFLnodebug;
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410 slist_add(s);
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411 sinit = s;
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412 }
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413
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414 return sinit;
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415 }
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416 }; |
