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annotate dmd2/enum.c @ 1638:0de4525a9ed6

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author Christian Kamm <kamm incasoftware de>
date Mon, 08 Mar 2010 20:06:08 +0100
parents 54b3c1394d62
children
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758
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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 #if IN_DMD
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34 sinit = NULL;
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35 #endif
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36 isdeprecated = 0;
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37 }
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38
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39 Dsymbol *EnumDeclaration::syntaxCopy(Dsymbol *s)
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40 {
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41 Type *t = NULL;
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42 if (memtype)
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43 t = memtype->syntaxCopy();
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44
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45 EnumDeclaration *ed;
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46 if (s)
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47 { ed = (EnumDeclaration *)s;
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48 ed->memtype = t;
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49 }
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50 else
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51 ed = new EnumDeclaration(loc, ident, t);
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52 ScopeDsymbol::syntaxCopy(ed);
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53 return ed;
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54 }
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55
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56 void EnumDeclaration::semantic(Scope *sc)
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57 {
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58 Type *t;
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59 Scope *sce;
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60
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61 //printf("EnumDeclaration::semantic(sd = %p, '%s') %s\n", sc->scopesym, sc->scopesym->toChars(), toChars());
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62 //printf("EnumDeclaration::semantic() %s\n", toChars());
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63 if (!members) // enum ident;
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64 return;
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65
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66 if (!memtype && !isAnonymous())
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67 { // Set memtype if we can to reduce fwd reference errors
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68 memtype = Type::tint32; // case 1) enum ident { ... }
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69 }
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70
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71 if (symtab) // if already done
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72 { if (!scope)
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73 return; // semantic() already completed
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74 }
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75 else
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76 symtab = new DsymbolTable();
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77
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78 Scope *scx = NULL;
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79 if (scope)
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80 { sc = scope;
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81 scx = scope; // save so we don't make redundant copies
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82 scope = NULL;
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83 }
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84
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85 if (sc->stc & STCdeprecated)
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86 isdeprecated = 1;
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87
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88 parent = sc->parent;
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89
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90 /* The separate, and distinct, cases are:
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91 * 1. enum { ... }
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92 * 2. enum : memtype { ... }
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93 * 3. enum ident { ... }
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94 * 4. enum ident : memtype { ... }
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95 */
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96
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97 if (memtype)
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98 {
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99 memtype = memtype->semantic(loc, sc);
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100
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101 /* Check to see if memtype is forward referenced
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102 */
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103 if (memtype->ty == Tenum)
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104 { EnumDeclaration *sym = (EnumDeclaration *)memtype->toDsymbol(sc);
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105 if (!sym->memtype || !sym->members || !sym->symtab || sym->scope)
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106 { // memtype is forward referenced, so try again later
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107 scope = scx ? scx : new Scope(*sc);
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108 scope->setNoFree();
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109 scope->module->addDeferredSemantic(this);
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110 printf("\tdeferring %s\n", toChars());
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111 return;
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112 }
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113 }
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114 #if 0 // Decided to abandon this restriction for D 2.0
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115 if (!memtype->isintegral())
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116 { error("base type must be of integral type, not %s", memtype->toChars());
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117 memtype = Type::tint32;
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118 }
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119 #endif
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120 }
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121
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122 type = type->semantic(loc, sc);
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123 if (isAnonymous())
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124 sce = sc;
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125 else
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126 { sce = sc->push(this);
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127 sce->parent = this;
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128 }
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129 if (members->dim == 0)
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130 error("enum %s must have at least one member", toChars());
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131 int first = 1;
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132 Expression *elast = NULL;
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133 for (int i = 0; i < members->dim; i++)
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134 {
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135 EnumMember *em = ((Dsymbol *)members->data[i])->isEnumMember();
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136 Expression *e;
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137
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138 if (!em)
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139 /* The e->semantic(sce) can insert other symbols, such as
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140 * template instances and function literals.
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141 */
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142 continue;
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143
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144 //printf(" Enum member '%s'\n",em->toChars());
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145 if (em->type)
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146 em->type = em->type->semantic(em->loc, sce);
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147 e = em->value;
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148 if (e)
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149 {
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150 assert(e->dyncast() == DYNCAST_EXPRESSION);
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151 e = e->semantic(sce);
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152 e = e->optimize(WANTvalue | WANTinterpret);
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153 if (memtype)
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154 {
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155 e = e->implicitCastTo(sce, memtype);
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156 e = e->optimize(WANTvalue | WANTinterpret);
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157 if (!isAnonymous())
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158 e = e->castTo(sce, type);
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159 t = memtype;
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160 }
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161 else if (em->type)
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162 {
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163 e = e->implicitCastTo(sce, em->type);
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164 e = e->optimize(WANTvalue | WANTinterpret);
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165 assert(isAnonymous());
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166 t = e->type;
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167 }
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168 else
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169 t = e->type;
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170 }
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171 else if (first)
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172 {
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173 if (memtype)
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174 t = memtype;
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175 else if (em->type)
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176 t = em->type;
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177 else
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178 t = Type::tint32;
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179 e = new IntegerExp(em->loc, 0, Type::tint32);
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180 e = e->implicitCastTo(sce, t);
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181 e = e->optimize(WANTvalue | WANTinterpret);
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182 if (!isAnonymous())
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183 e = e->castTo(sce, type);
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184 }
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185 else
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186 {
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187 // Set value to (elast + 1).
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188 // But first check that (elast != t.max)
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189 assert(elast);
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190 e = new EqualExp(TOKequal, em->loc, elast, t->getProperty(0, Id::max));
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191 e = e->semantic(sce);
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192 e = e->optimize(WANTvalue | WANTinterpret);
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193 if (e->toInteger())
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194 error("overflow of enum value %s", elast->toChars());
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195
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196 // Now set e to (elast + 1)
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197 e = new AddExp(em->loc, elast, new IntegerExp(em->loc, 1, Type::tint32));
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198 e = e->semantic(sce);
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199 e = e->castTo(sce, elast->type);
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200 e = e->optimize(WANTvalue | WANTinterpret);
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201 }
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202 elast = e;
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203 em->value = e;
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204
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205 // Add to symbol table only after evaluating 'value'
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206 if (isAnonymous())
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207 {
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208 /* Anonymous enum members get added to enclosing scope.
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209 */
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210 for (Scope *scx = sce; scx; scx = scx->enclosing)
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211 {
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212 if (scx->scopesym)
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213 {
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214 if (!scx->scopesym->symtab)
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215 scx->scopesym->symtab = new DsymbolTable();
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diff changeset
216 em->addMember(sce, scx->scopesym, 1);
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217 break;
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218 }
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219 }
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220 }
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221 else
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diff changeset
222 em->addMember(sc, this, 1);
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223
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diff changeset
224 /* Compute .min, .max and .default values.
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225 * If enum doesn't have a name, we can never identify the enum type,
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226 * so there is no purpose for a .min, .max or .default
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227 */
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228 if (!isAnonymous())
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229 {
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230 if (first)
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231 { defaultval = e;
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232 minval = e;
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233 maxval = e;
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234 }
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235 else
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236 { Expression *ec;
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237
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238 /* In order to work successfully with UDTs,
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239 * build expressions to do the comparisons,
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240 * and let the semantic analyzer and constant
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241 * folder give us the result.
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242 */
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243
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244 // Compute if(e < minval)
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245 ec = new CmpExp(TOKlt, em->loc, e, minval);
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246 ec = ec->semantic(sce);
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247 ec = ec->optimize(WANTvalue | WANTinterpret);
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248 if (ec->toInteger())
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249 minval = e;
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250
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251 ec = new CmpExp(TOKgt, em->loc, e, maxval);
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252 ec = ec->semantic(sce);
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253 ec = ec->optimize(WANTvalue | WANTinterpret);
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254 if (ec->toInteger())
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255 maxval = e;
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256 }
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257 }
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258 first = 0;
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259 }
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260 //printf("defaultval = %lld\n", defaultval);
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261
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262 //if (defaultval) printf("defaultval: %s %s\n", defaultval->toChars(), defaultval->type->toChars());
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263 if (sc != sce)
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264 sce->pop();
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265 //members->print();
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266 }
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267
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268 int EnumDeclaration::oneMember(Dsymbol **ps)
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269 {
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270 if (isAnonymous())
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271 return Dsymbol::oneMembers(members, ps);
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272 return Dsymbol::oneMember(ps);
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273 }
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274
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275 void EnumDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
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276 { int i;
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277
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278 buf->writestring("enum ");
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279 if (ident)
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280 { buf->writestring(ident->toChars());
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281 buf->writeByte(' ');
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282 }
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283 if (memtype)
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284 {
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285 buf->writestring(": ");
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286 memtype->toCBuffer(buf, NULL, hgs);
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287 }
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288 if (!members)
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289 {
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290 buf->writeByte(';');
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291 buf->writenl();
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292 return;
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293 }
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294 buf->writenl();
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295 buf->writeByte('{');
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296 buf->writenl();
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297 for (i = 0; i < members->dim; i++)
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298 {
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299 EnumMember *em = ((Dsymbol *)members->data[i])->isEnumMember();
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300 if (!em)
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301 continue;
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302 //buf->writestring(" ");
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303 em->toCBuffer(buf, hgs);
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304 buf->writeByte(',');
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305 buf->writenl();
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306 }
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307 buf->writeByte('}');
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308 buf->writenl();
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309 }
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310
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311 Type *EnumDeclaration::getType()
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312 {
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313 return type;
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314 }
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315
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316 const char *EnumDeclaration::kind()
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317 {
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318 return "enum";
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319 }
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320
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321 int EnumDeclaration::isDeprecated()
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322 {
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323 return isdeprecated;
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324 }
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325
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326 Dsymbol *EnumDeclaration::search(Loc loc, Identifier *ident, int flags)
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327 {
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328 //printf("%s.EnumDeclaration::search('%s')\n", toChars(), ident->toChars());
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329 if (scope)
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330 // Try one last time to resolve this enum
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331 semantic(scope);
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332
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333 if (!members || !symtab || scope)
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334 { error("is forward referenced when looking for '%s'", ident->toChars());
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335 //*(char*)0=0;
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336 return NULL;
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337 }
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338
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339 Dsymbol *s = ScopeDsymbol::search(loc, ident, flags);
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340 return s;
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341 }
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342
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343 /********************************* EnumMember ****************************/
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344
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345 EnumMember::EnumMember(Loc loc, Identifier *id, Expression *value, Type *type)
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346 : Dsymbol(id)
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347 {
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348 this->value = value;
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349 this->type = type;
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diff changeset
350 this->loc = loc;
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351 }
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352
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353 Dsymbol *EnumMember::syntaxCopy(Dsymbol *s)
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354 {
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355 Expression *e = NULL;
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356 if (value)
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357 e = value->syntaxCopy();
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358
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359 Type *t = NULL;
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360 if (type)
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361 t = type->syntaxCopy();
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362
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363 EnumMember *em;
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364 if (s)
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365 { em = (EnumMember *)s;
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366 em->loc = loc;
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367 em->value = e;
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368 em->type = t;
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369 }
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370 else
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371 em = new EnumMember(loc, ident, e, t);
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372 return em;
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373 }
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374
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375 void EnumMember::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
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376 {
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377 if (type)
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378 type->toCBuffer(buf, ident, hgs);
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379 else
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380 buf->writestring(ident->toChars());
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381 if (value)
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382 {
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383 buf->writestring(" = ");
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384 value->toCBuffer(buf, hgs);
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385 }
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386 }
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387
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388 const char *EnumMember::kind()
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389 {
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390 return "enum member";
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391 }
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392
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393