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2 // Copyright (c) 1999-2006 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
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18 /********************************* EnumDeclaration ****************************/
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19
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20 EnumDeclaration::EnumDeclaration(Loc loc, Identifier *id, Type *memtype)
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21 : ScopeDsymbol(id)
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22 {
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23 this->loc = loc;
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24 type = new TypeEnum(this);
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25 this->memtype = memtype;
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26 maxval = 0;
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27 minval = 0;
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28 defaultval = 0;
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29 sinit = NULL;
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30 }
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31
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32 Dsymbol *EnumDeclaration::syntaxCopy(Dsymbol *s)
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33 {
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34 Type *t = NULL;
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35 if (memtype)
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36 t = memtype->syntaxCopy();
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37
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38 EnumDeclaration *ed;
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39 if (s)
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40 { ed = (EnumDeclaration *)s;
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41 ed->memtype = t;
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42 }
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43 else
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44 ed = new EnumDeclaration(loc, ident, t);
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45 ScopeDsymbol::syntaxCopy(ed);
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46 return ed;
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47 }
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48
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49 void EnumDeclaration::semantic(Scope *sc)
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50 { int i;
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51 uinteger_t number;
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52 Type *t;
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53 Scope *sce;
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54
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55 //printf("EnumDeclaration::semantic(sd = %p, '%s')\n", sc->scopesym, sc->scopesym->toChars());
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56 if (symtab) // if already done
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57 return;
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58 if (!memtype)
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59 memtype = Type::tint32;
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60 parent = sc->scopesym;
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61 memtype = memtype->semantic(loc, sc);
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62
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63 /* Check to see if memtype is forward referenced
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64 */
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65 if (memtype->ty == Tenum)
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66 { EnumDeclaration *sym = (EnumDeclaration *)memtype->toDsymbol(sc);
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67 if (!sym->memtype)
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68 {
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69 error("base enum %s is forward referenced", sym->toChars());
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70 memtype = Type::tint32;
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71 }
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72 }
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73
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74 if (!memtype->isintegral())
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75 { error("base type must be of integral type, not %s", memtype->toChars());
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76 memtype = Type::tint32;
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77 }
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78
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79 t = isAnonymous() ? memtype : type;
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80 symtab = new DsymbolTable();
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81 sce = sc->push(this);
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82 sce->parent = this;
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83 number = 0;
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84 if (!members) // enum ident;
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85 return;
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86 if (members->dim == 0)
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87 error("enum %s must have at least one member", toChars());
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88 int first = 1;
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89 for (i = 0; i < members->dim; i++)
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90 {
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91 EnumMember *em = ((Dsymbol *)members->data[i])->isEnumMember();
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92 Expression *e;
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93
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94 if (!em)
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95 /* The e->semantic(sce) can insert other symbols, such as
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96 * template instances and function literals.
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97 */
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98 continue;
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99
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100 //printf("Enum member '%s'\n",em->toChars());
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101 e = em->value;
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102 if (e)
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103 {
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104 assert(e->dyncast() == DYNCAST_EXPRESSION);
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105 e = e->semantic(sce);
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106 e = e->optimize(WANTvalue);
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107 // Need to copy it because we're going to change the type
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108 e = e->copy();
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109 e = e->implicitCastTo(sc, memtype);
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110 e = e->optimize(WANTvalue);
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111 number = e->toInteger();
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112 e->type = t;
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113 }
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114 else
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115 { // Default is the previous number plus 1
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116
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117 // Check for overflow
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118 if (!first)
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119 {
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120 switch (t->toBasetype()->ty)
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121 {
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122 case Tbool:
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123 if (number == 2) goto Loverflow;
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124 break;
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125
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126 case Tint8:
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127 if (number == 128) goto Loverflow;
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128 break;
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129
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130 case Tchar:
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131 case Tuns8:
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132 if (number == 256) goto Loverflow;
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133 break;
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134
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135 case Tint16:
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136 if (number == 0x8000) goto Loverflow;
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137 break;
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138
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139 case Twchar:
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140 case Tuns16:
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141 if (number == 0x10000) goto Loverflow;
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142 break;
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143
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144 case Tint32:
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145 if (number == 0x80000000) goto Loverflow;
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146 break;
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147
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148 case Tdchar:
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149 case Tuns32:
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150 if (number == 0x100000000LL) goto Loverflow;
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151 break;
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152
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153 case Tint64:
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154 if (number == 0x8000000000000000LL) goto Loverflow;
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155 break;
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156
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157 case Tuns64:
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158 if (number == 0) goto Loverflow;
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159 break;
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160
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161 Loverflow:
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162 error("overflow of enum value");
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163 break;
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164
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165 default:
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166 assert(0);
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167 }
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168 }
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169 e = new IntegerExp(em->loc, number, t);
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170 }
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171 em->value = e;
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172
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173 // Add to symbol table only after evaluating 'value'
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174 if (isAnonymous())
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175 {
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176 //sce->enclosing->insert(em);
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177 for (Scope *scx = sce->enclosing; scx; scx = scx->enclosing)
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178 {
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179 if (scx->scopesym)
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180 {
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181 if (!scx->scopesym->symtab)
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182 scx->scopesym->symtab = new DsymbolTable();
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183 em->addMember(sce, scx->scopesym, 1);
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184 break;
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185 }
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186 }
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187 }
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188 else
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189 em->addMember(sc, this, 1);
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190
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191 if (first)
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192 { first = 0;
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193 defaultval = number;
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194 minval = number;
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195 maxval = number;
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196 }
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197 else if (memtype->isunsigned())
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198 {
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199 if (number < minval)
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200 minval = number;
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201 if (number > maxval)
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202 maxval = number;
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203 }
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204 else
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205 {
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206 if ((sinteger_t)number < (sinteger_t)minval)
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207 minval = number;
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208 if ((sinteger_t)number > (sinteger_t)maxval)
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209 maxval = number;
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210 }
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211
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212 number++;
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213 }
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214 //printf("defaultval = %lld\n", defaultval);
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215
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216 sce->pop();
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217 //members->print();
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218 }
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219
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220 int EnumDeclaration::oneMember(Dsymbol **ps)
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221 {
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222 if (isAnonymous())
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223 return Dsymbol::oneMembers(members, ps);
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224 return Dsymbol::oneMember(ps);
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225 }
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226
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227 void EnumDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
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228 { int i;
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229
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230 buf->writestring("enum ");
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231 if (ident)
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232 { buf->writestring(ident->toChars());
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233 buf->writeByte(' ');
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234 }
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235 if (memtype)
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236 {
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237 buf->writestring(": ");
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238 memtype->toCBuffer(buf, NULL, hgs);
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239 }
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240 if (!members)
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241 {
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242 buf->writeByte(';');
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243 buf->writenl();
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244 return;
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245 }
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246 buf->writenl();
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247 buf->writeByte('{');
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248 buf->writenl();
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249 for (i = 0; i < members->dim; i++)
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250 {
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251 EnumMember *em = ((Dsymbol *)members->data[i])->isEnumMember();
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252 if (!em)
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253 continue;
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254 //buf->writestring(" ");
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255 em->toCBuffer(buf, hgs);
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256 buf->writeByte(',');
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257 buf->writenl();
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258 }
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259 buf->writeByte('}');
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260 buf->writenl();
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261 }
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262
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263 Type *EnumDeclaration::getType()
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264 {
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265 return type;
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266 }
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267
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268 char *EnumDeclaration::kind()
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269 {
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270 return "enum";
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271 }
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272
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273 /********************************* EnumMember ****************************/
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274
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275 EnumMember::EnumMember(Loc loc, Identifier *id, Expression *value)
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276 : Dsymbol(id)
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277 {
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278 this->value = value;
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279 this->loc = loc;
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280 }
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281
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282 Dsymbol *EnumMember::syntaxCopy(Dsymbol *s)
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283 {
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284 Expression *e = NULL;
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285 if (value)
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286 e = value->syntaxCopy();
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287
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288 EnumMember *em;
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289 if (s)
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290 { em = (EnumMember *)s;
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291 em->loc = loc;
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292 em->value = e;
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293 }
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294 else
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295 em = new EnumMember(loc, ident, e);
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296 return em;
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297 }
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298
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299 void EnumMember::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
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300 {
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301 buf->writestring(ident->toChars());
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302 if (value)
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303 {
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304 buf->writestring(" = ");
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305 value->toCBuffer(buf, hgs);
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306 }
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307 }
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308
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309 char *EnumMember::kind()
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310 {
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311 return "enum member";
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312 }
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313
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314
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