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annotate dmd2/enum.c @ 1138:4c8bb03e4fbc

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Update DtoConstFP() to be correct after LLVM r67562, which changed the way the APFloat constructor expects its i80 APInts to be formatted. (They're now actually consistent with the x87 format)
author Frits van Bommel <fvbommel wxs.nl>
date Tue, 24 Mar 2009 15:24:59 +0100
parents f04dde6e882c
children 638d16625da2
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1
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2 // Copyright (c) 1999-2008 by Digital Mars
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3 // All Rights Reserved
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4 // written by Walter Bright
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5 // http://www.digitalmars.com
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6 // License for redistribution is by either the Artistic License
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7 // in artistic.txt, or the GNU General Public License in gnu.txt.
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8 // See the included readme.txt for details.
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9
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10 #include <stdio.h>
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11 #include <assert.h>
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12
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13 #include "root.h"
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14 #include "enum.h"
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15 #include "mtype.h"
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16 #include "scope.h"
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17 #include "id.h"
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18 #include "expression.h"
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19 #include "module.h"
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20 #include "declaration.h"
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21
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22 /********************************* EnumDeclaration ****************************/
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23
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24 EnumDeclaration::EnumDeclaration(Loc loc, Identifier *id, Type *memtype)
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25 : ScopeDsymbol(id)
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26 {
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27 this->loc = loc;
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28 type = new TypeEnum(this);
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29 this->memtype = memtype;
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30 maxval = NULL;
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31 minval = NULL;
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32 defaultval = NULL;
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33 sinit = NULL;
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34 scope = NULL;
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35 isdeprecated = 0;
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36 }
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37
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38 Dsymbol *EnumDeclaration::syntaxCopy(Dsymbol *s)
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39 {
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40 Type *t = NULL;
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41 if (memtype)
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42 t = memtype->syntaxCopy();
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43
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44 EnumDeclaration *ed;
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45 if (s)
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46 { ed = (EnumDeclaration *)s;
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47 ed->memtype = t;
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48 }
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49 else
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50 ed = new EnumDeclaration(loc, ident, t);
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51 ScopeDsymbol::syntaxCopy(ed);
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52 return ed;
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53 }
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54
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55 void EnumDeclaration::semantic(Scope *sc)
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56 {
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57 Type *t;
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58 Scope *sce;
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59
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60 //printf("EnumDeclaration::semantic(sd = %p, '%s') %s\n", sc->scopesym, sc->scopesym->toChars(), toChars());
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61 //printf("EnumDeclaration::semantic() %s\n", toChars());
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62 if (!members) // enum ident;
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63 return;
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64
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65 if (!memtype && !isAnonymous())
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66 { // Set memtype if we can to reduce fwd reference errors
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67 memtype = Type::tint32; // case 1) enum ident { ... }
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68 }
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69
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70 if (symtab) // if already done
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71 { if (!scope)
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72 return; // semantic() already completed
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73 }
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74 else
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75 symtab = new DsymbolTable();
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76
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77 Scope *scx = NULL;
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78 if (scope)
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79 { sc = scope;
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80 scx = scope; // save so we don't make redundant copies
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81 scope = NULL;
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82 }
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83
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84 if (sc->stc & STCdeprecated)
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85 isdeprecated = 1;
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86
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87 parent = sc->parent;
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88
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89 /* The separate, and distinct, cases are:
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90 * 1. enum { ... }
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91 * 2. enum : memtype { ... }
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92 * 3. enum ident { ... }
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93 * 4. enum ident : memtype { ... }
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94 */
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95
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96 if (memtype)
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97 {
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98 memtype = memtype->semantic(loc, sc);
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99
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100 /* Check to see if memtype is forward referenced
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101 */
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102 if (memtype->ty == Tenum)
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103 { EnumDeclaration *sym = (EnumDeclaration *)memtype->toDsymbol(sc);
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104 if (!sym->memtype || !sym->members || !sym->symtab || sym->scope)
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105 { // memtype is forward referenced, so try again later
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106 scope = scx ? scx : new Scope(*sc);
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107 scope->setNoFree();
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108 scope->module->addDeferredSemantic(this);
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109 printf("\tdeferring %s\n", toChars());
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110 return;
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111 }
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112 }
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113 #if 0 // Decided to abandon this restriction for D 2.0
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114 if (!memtype->isintegral())
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115 { error("base type must be of integral type, not %s", memtype->toChars());
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116 memtype = Type::tint32;
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117 }
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118 #endif
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119 }
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120
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121 type = type->semantic(loc, sc);
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122 if (isAnonymous())
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123 sce = sc;
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124 else
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125 { sce = sc->push(this);
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126 sce->parent = this;
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127 }
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128 if (members->dim == 0)
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129 error("enum %s must have at least one member", toChars());
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130 int first = 1;
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131 Expression *elast = NULL;
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132 for (int i = 0; i < members->dim; i++)
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133 {
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134 EnumMember *em = ((Dsymbol *)members->data[i])->isEnumMember();
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135 Expression *e;
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136
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137 if (!em)
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138 /* The e->semantic(sce) can insert other symbols, such as
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139 * template instances and function literals.
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140 */
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141 continue;
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142
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143 //printf(" Enum member '%s'\n",em->toChars());
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144 if (em->type)
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145 em->type = em->type->semantic(em->loc, sce);
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146 e = em->value;
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147 if (e)
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148 {
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149 assert(e->dyncast() == DYNCAST_EXPRESSION);
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150 e = e->semantic(sce);
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151 e = e->optimize(WANTvalue | WANTinterpret);
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152 if (memtype)
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153 {
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154 e = e->implicitCastTo(sce, memtype);
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155 e = e->optimize(WANTvalue | WANTinterpret);
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156 if (!isAnonymous())
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157 e = e->castTo(sce, type);
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158 t = memtype;
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159 }
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160 else if (em->type)
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161 {
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162 e = e->implicitCastTo(sce, em->type);
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163 e = e->optimize(WANTvalue | WANTinterpret);
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164 assert(isAnonymous());
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165 t = e->type;
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166 }
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167 else
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168 t = e->type;
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169 }
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170 else if (first)
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171 {
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172 if (memtype)
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173 t = memtype;
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174 else if (em->type)
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175 t = em->type;
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176 else
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177 t = Type::tint32;
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178 e = new IntegerExp(em->loc, 0, Type::tint32);
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179 e = e->implicitCastTo(sce, t);
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180 e = e->optimize(WANTvalue | WANTinterpret);
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181 if (!isAnonymous())
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182 e = e->castTo(sce, type);
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183 }
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184 else
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185 {
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186 // Set value to (elast + 1).
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187 // But first check that (elast != t.max)
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188 assert(elast);
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189 e = new EqualExp(TOKequal, em->loc, elast, t->getProperty(0, Id::max));
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190 e = e->semantic(sce);
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191 e = e->optimize(WANTvalue | WANTinterpret);
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192 if (e->toInteger())
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193 error("overflow of enum value %s", elast->toChars());
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194
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195 // Now set e to (elast + 1)
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196 e = new AddExp(em->loc, elast, new IntegerExp(em->loc, 1, Type::tint32));
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197 e = e->semantic(sce);
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198 e = e->castTo(sce, elast->type);
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199 e = e->optimize(WANTvalue | WANTinterpret);
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200 }
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201 elast = e;
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202 em->value = e;
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203
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204 // Add to symbol table only after evaluating 'value'
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205 if (isAnonymous())
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206 {
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207 /* Anonymous enum members get added to enclosing scope.
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208 */
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209 for (Scope *scx = sce; scx; scx = scx->enclosing)
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210 {
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211 if (scx->scopesym)
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212 {
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213 if (!scx->scopesym->symtab)
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214 scx->scopesym->symtab = new DsymbolTable();
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diff changeset
215 em->addMember(sce, scx->scopesym, 1);
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216 break;
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217 }
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218 }
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219 }
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220 else
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diff changeset
221 em->addMember(sc, this, 1);
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222
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diff changeset
223 /* Compute .min, .max and .default values.
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224 * If enum doesn't have a name, we can never identify the enum type,
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225 * so there is no purpose for a .min, .max or .default
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226 */
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227 if (!isAnonymous())
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228 {
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229 if (first)
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230 { defaultval = e;
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231 minval = e;
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232 maxval = e;
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233 }
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234 else
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235 { Expression *ec;
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236
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237 /* In order to work successfully with UDTs,
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238 * build expressions to do the comparisons,
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239 * and let the semantic analyzer and constant
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240 * folder give us the result.
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241 */
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242
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243 // Compute if(e < minval)
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244 ec = new CmpExp(TOKlt, em->loc, e, minval);
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245 ec = ec->semantic(sce);
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246 ec = ec->optimize(WANTvalue | WANTinterpret);
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247 if (ec->toInteger())
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248 minval = e;
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249
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250 ec = new CmpExp(TOKgt, em->loc, e, maxval);
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251 ec = ec->semantic(sce);
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252 ec = ec->optimize(WANTvalue | WANTinterpret);
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253 if (ec->toInteger())
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254 maxval = e;
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255 }
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256 }
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257 first = 0;
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258 }
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259 //printf("defaultval = %lld\n", defaultval);
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260
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261 //if (defaultval) printf("defaultval: %s %s\n", defaultval->toChars(), defaultval->type->toChars());
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262 if (sc != sce)
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263 sce->pop();
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264 //members->print();
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265 }
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266
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267 int EnumDeclaration::oneMember(Dsymbol **ps)
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268 {
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269 if (isAnonymous())
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270 return Dsymbol::oneMembers(members, ps);
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271 return Dsymbol::oneMember(ps);
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272 }
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273
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274 void EnumDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
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275 { int i;
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276
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277 buf->writestring("enum ");
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278 if (ident)
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279 { buf->writestring(ident->toChars());
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280 buf->writeByte(' ');
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281 }
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282 if (memtype)
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283 {
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284 buf->writestring(": ");
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285 memtype->toCBuffer(buf, NULL, hgs);
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286 }
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287 if (!members)
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288 {
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289 buf->writeByte(';');
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290 buf->writenl();
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291 return;
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292 }
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293 buf->writenl();
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294 buf->writeByte('{');
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295 buf->writenl();
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296 for (i = 0; i < members->dim; i++)
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297 {
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298 EnumMember *em = ((Dsymbol *)members->data[i])->isEnumMember();
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299 if (!em)
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300 continue;
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301 //buf->writestring(" ");
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302 em->toCBuffer(buf, hgs);
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303 buf->writeByte(',');
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304 buf->writenl();
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305 }
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306 buf->writeByte('}');
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307 buf->writenl();
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308 }
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309
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310 Type *EnumDeclaration::getType()
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311 {
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312 return type;
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313 }
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314
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315 const char *EnumDeclaration::kind()
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316 {
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317 return "enum";
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318 }
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319
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320 int EnumDeclaration::isDeprecated()
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321 {
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322 return isdeprecated;
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323 }
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324
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325 Dsymbol *EnumDeclaration::search(Loc loc, Identifier *ident, int flags)
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326 {
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327 //printf("%s.EnumDeclaration::search('%s')\n", toChars(), ident->toChars());
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328 if (scope)
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329 // Try one last time to resolve this enum
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330 semantic(scope);
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331
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332 if (!members || !symtab || scope)
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333 { error("is forward referenced when looking for '%s'", ident->toChars());
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334 //*(char*)0=0;
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335 return NULL;
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336 }
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337
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338 Dsymbol *s = ScopeDsymbol::search(loc, ident, flags);
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339 return s;
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340 }
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341
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342 /********************************* EnumMember ****************************/
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343
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344 EnumMember::EnumMember(Loc loc, Identifier *id, Expression *value, Type *type)
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345 : Dsymbol(id)
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346 {
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347 this->value = value;
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348 this->type = type;
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diff changeset
349 this->loc = loc;
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350 }
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351
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352 Dsymbol *EnumMember::syntaxCopy(Dsymbol *s)
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353 {
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354 Expression *e = NULL;
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355 if (value)
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356 e = value->syntaxCopy();
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357
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358 Type *t = NULL;
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359 if (type)
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360 t = type->syntaxCopy();
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361
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362 EnumMember *em;
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363 if (s)
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364 { em = (EnumMember *)s;
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365 em->loc = loc;
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366 em->value = e;
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367 em->type = t;
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368 }
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369 else
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370 em = new EnumMember(loc, ident, e, t);
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371 return em;
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372 }
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373
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374 void EnumMember::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
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375 {
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376 if (type)
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377 type->toCBuffer(buf, ident, hgs);
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378 else
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379 buf->writestring(ident->toChars());
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380 if (value)
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381 {
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382 buf->writestring(" = ");
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383 value->toCBuffer(buf, hgs);
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384 }
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385 }
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386
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387 const char *EnumMember::kind()
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388 {
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389 return "enum member";
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390 }
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391
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392