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336
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1
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2 // Compiler implementation of the D programming language
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3 // Copyright (c) 1999-2008 by Digital Mars
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4 // All Rights Reserved
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5 // written by Walter Bright
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6 // http://www.digitalmars.com
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7 // License for redistribution is by either the Artistic License
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8 // in artistic.txt, or the GNU General Public License in gnu.txt.
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9 // See the included readme.txt for details.
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10
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11 #include <stdio.h>
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12 #include <assert.h>
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13
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14 #include "mars.h"
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15 #include "init.h"
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16 #include "expression.h"
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17 #include "statement.h"
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18 #include "identifier.h"
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19 #include "declaration.h"
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20 #include "aggregate.h"
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21 #include "scope.h"
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22 #include "mtype.h"
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23 #include "hdrgen.h"
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24
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25 /********************************** Initializer *******************************/
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26
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27 Initializer::Initializer(Loc loc)
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28 {
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29 this->loc = loc;
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30 }
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31
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32 Initializer *Initializer::syntaxCopy()
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33 {
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34 return this;
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35 }
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36
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37 Initializer *Initializer::semantic(Scope *sc, Type *t)
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38 {
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39 return this;
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40 }
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41
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42 Type *Initializer::inferType(Scope *sc)
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43 {
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44 error(loc, "cannot infer type from initializer");
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45 return Type::terror;
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46 }
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47
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48 Initializers *Initializer::arraySyntaxCopy(Initializers *ai)
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49 { Initializers *a = NULL;
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50
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51 if (ai)
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52 {
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53 a = new Initializers();
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54 a->setDim(ai->dim);
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55 for (int i = 0; i < a->dim; i++)
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56 { Initializer *e = (Initializer *)ai->data[i];
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57
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58 e = e->syntaxCopy();
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59 a->data[i] = e;
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60 }
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61 }
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62 return a;
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63 }
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64
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65 char *Initializer::toChars()
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66 { OutBuffer *buf;
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67 HdrGenState hgs;
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68
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69 memset(&hgs, 0, sizeof(hgs));
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70 buf = new OutBuffer();
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71 toCBuffer(buf, &hgs);
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72 return buf->toChars();
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73 }
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74
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75 /********************************** VoidInitializer ***************************/
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76
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77 VoidInitializer::VoidInitializer(Loc loc)
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78 : Initializer(loc)
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79 {
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80 type = NULL;
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81 }
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82
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83
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84 Initializer *VoidInitializer::syntaxCopy()
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85 {
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86 return new VoidInitializer(loc);
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87 }
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88
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89
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90 Initializer *VoidInitializer::semantic(Scope *sc, Type *t)
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91 {
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92 //printf("VoidInitializer::semantic(t = %p)\n", t);
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93 type = t;
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94 return this;
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95 }
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96
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97
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98 Expression *VoidInitializer::toExpression()
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99 {
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100 error(loc, "void initializer has no value");
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101 return new IntegerExp(0);
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102 }
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103
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104
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105 void VoidInitializer::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
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106 {
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107 buf->writestring("void");
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108 }
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109
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110
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111 /********************************** StructInitializer *************************/
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112
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113 StructInitializer::StructInitializer(Loc loc)
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114 : Initializer(loc)
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115 {
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116 ad = NULL;
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117 }
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118
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119 Initializer *StructInitializer::syntaxCopy()
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120 {
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121 StructInitializer *ai = new StructInitializer(loc);
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122
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123 assert(field.dim == value.dim);
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124 ai->field.setDim(field.dim);
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125 ai->value.setDim(value.dim);
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126 for (int i = 0; i < field.dim; i++)
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127 {
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128 ai->field.data[i] = field.data[i];
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129
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130 Initializer *init = (Initializer *)value.data[i];
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131 init = init->syntaxCopy();
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132 ai->value.data[i] = init;
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133 }
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134 return ai;
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135 }
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136
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137 void StructInitializer::addInit(Identifier *field, Initializer *value)
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138 {
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139 //printf("StructInitializer::addInit(field = %p, value = %p)\n", field, value);
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140 this->field.push(field);
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141 this->value.push(value);
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142 }
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143
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144 Initializer *StructInitializer::semantic(Scope *sc, Type *t)
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145 {
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146 TypeStruct *ts;
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147 int errors = 0;
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148
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149 //printf("StructInitializer::semantic(t = %s) %s\n", t->toChars(), toChars());
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150 vars.setDim(field.dim);
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151 t = t->toBasetype();
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152 if (t->ty == Tstruct)
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153 { unsigned i;
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154 unsigned fieldi = 0;
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155
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156 ts = (TypeStruct *)t;
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157 ad = ts->sym;
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158 for (i = 0; i < field.dim; i++)
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159 {
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160 Identifier *id = (Identifier *)field.data[i];
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161 Initializer *val = (Initializer *)value.data[i];
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162 Dsymbol *s;
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163 VarDeclaration *v;
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164
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165 if (id == NULL)
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166 {
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167 if (fieldi >= ad->fields.dim)
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168 { error(loc, "too many initializers for %s", ad->toChars());
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169 field.remove(i);
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170 i--;
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171 continue;
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172 }
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173 else
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174 {
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175 s = (Dsymbol *)ad->fields.data[fieldi];
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176 }
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177 }
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178 else
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179 {
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180 //s = ad->symtab->lookup(id);
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181 s = ad->search(loc, id, 0);
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182 if (!s)
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183 {
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184 error(loc, "'%s' is not a member of '%s'", id->toChars(), t->toChars());
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185 continue;
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186 }
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187
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188 // Find out which field index it is
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189 for (fieldi = 0; 1; fieldi++)
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190 {
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191 if (fieldi >= ad->fields.dim)
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192 {
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193 s->error("is not a per-instance initializable field");
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194 break;
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195 }
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196 if (s == (Dsymbol *)ad->fields.data[fieldi])
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197 break;
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198 }
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199 }
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200 if (s && (v = s->isVarDeclaration()) != NULL)
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201 {
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202 val = val->semantic(sc, v->type);
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203 value.data[i] = (void *)val;
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204 vars.data[i] = (void *)v;
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205 }
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206 else
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207 { error(loc, "%s is not a field of %s", id ? id->toChars() : s->toChars(), ad->toChars());
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208 errors = 1;
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209 }
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210 fieldi++;
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211 }
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212 }
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213 else if (t->ty == Tdelegate && value.dim == 0)
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214 { /* Rewrite as empty delegate literal { }
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215 */
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216 Arguments *arguments = new Arguments;
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217 Type *tf = new TypeFunction(arguments, NULL, 0, LINKd);
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218 FuncLiteralDeclaration *fd = new FuncLiteralDeclaration(loc, 0, tf, TOKdelegate, NULL);
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219 fd->fbody = new CompoundStatement(loc, new Statements());
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220 fd->endloc = loc;
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221 Expression *e = new FuncExp(loc, fd);
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222 ExpInitializer *ie = new ExpInitializer(loc, e);
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223 return ie->semantic(sc, t);
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224 }
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225 else
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226 {
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227 error(loc, "a struct is not a valid initializer for a %s", t->toChars());
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228 errors = 1;
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229 }
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230 if (errors)
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231 {
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232 field.setDim(0);
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233 value.setDim(0);
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234 vars.setDim(0);
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235 }
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236 return this;
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237 }
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238
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239
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240 /***************************************
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241 * This works by transforming a struct initializer into
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242 * a struct literal. In the future, the two should be the
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243 * same thing.
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244 */
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245 Expression *StructInitializer::toExpression()
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246 { Expression *e;
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247
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248 //printf("StructInitializer::toExpression() %s\n", toChars());
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249 if (!ad) // if fwd referenced
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250 {
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251 return NULL;
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252 }
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253 StructDeclaration *sd = ad->isStructDeclaration();
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254 if (!sd)
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255 return NULL;
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256 Expressions *elements = new Expressions();
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257 for (size_t i = 0; i < value.dim; i++)
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258 {
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259 if (field.data[i])
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260 goto Lno;
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261 Initializer *iz = (Initializer *)value.data[i];
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262 if (!iz)
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263 goto Lno;
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264 Expression *ex = iz->toExpression();
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265 if (!ex)
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266 goto Lno;
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267 elements->push(ex);
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268 }
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269 e = new StructLiteralExp(loc, sd, elements);
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270 e->type = sd->type;
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271 return e;
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272
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273 Lno:
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274 delete elements;
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275 //error(loc, "struct initializers as expressions are not allowed");
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276 return NULL;
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277 }
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278
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279
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280 void StructInitializer::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
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281 {
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282 //printf("StructInitializer::toCBuffer()\n");
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283 buf->writebyte('{');
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284 for (int i = 0; i < field.dim; i++)
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285 {
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286 if (i > 0)
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287 buf->writebyte(',');
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288 Identifier *id = (Identifier *)field.data[i];
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289 if (id)
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290 {
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291 buf->writestring(id->toChars());
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292 buf->writebyte(':');
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293 }
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294 Initializer *iz = (Initializer *)value.data[i];
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295 if (iz)
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296 iz->toCBuffer(buf, hgs);
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297 }
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298 buf->writebyte('}');
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299 }
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300
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301 /********************************** ArrayInitializer ************************************/
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302
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303 ArrayInitializer::ArrayInitializer(Loc loc)
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304 : Initializer(loc)
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305 {
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306 dim = 0;
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307 type = NULL;
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308 sem = 0;
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309 }
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310
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311 Initializer *ArrayInitializer::syntaxCopy()
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312 {
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313 //printf("ArrayInitializer::syntaxCopy()\n");
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314
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315 ArrayInitializer *ai = new ArrayInitializer(loc);
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316
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317 assert(index.dim == value.dim);
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318 ai->index.setDim(index.dim);
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319 ai->value.setDim(value.dim);
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320 for (int i = 0; i < ai->value.dim; i++)
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321 { Expression *e = (Expression *)index.data[i];
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322 if (e)
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323 e = e->syntaxCopy();
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324 ai->index.data[i] = e;
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325
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326 Initializer *init = (Initializer *)value.data[i];
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327 init = init->syntaxCopy();
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328 ai->value.data[i] = init;
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329 }
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330 return ai;
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331 }
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332
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333 void ArrayInitializer::addInit(Expression *index, Initializer *value)
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334 {
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335 this->index.push(index);
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336 this->value.push(value);
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337 dim = 0;
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338 type = NULL;
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339 }
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340
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341 Initializer *ArrayInitializer::semantic(Scope *sc, Type *t)
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342 { unsigned i;
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343 unsigned length;
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344
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345 //printf("ArrayInitializer::semantic(%s)\n", t->toChars());
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346 if (sem) // if semantic() already run
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347 return this;
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348 sem = 1;
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349 type = t;
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350 t = t->toBasetype();
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351 switch (t->ty)
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352 {
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353 case Tpointer:
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354 case Tsarray:
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355 case Tarray:
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356 break;
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357
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358 default:
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359 error(loc, "cannot use array to initialize %s", type->toChars());
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360 return this;
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361 }
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362
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363 length = 0;
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364 for (i = 0; i < index.dim; i++)
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365 { Expression *idx;
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366 Initializer *val;
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367
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368 idx = (Expression *)index.data[i];
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369 if (idx)
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370 { idx = idx->semantic(sc);
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371 idx = idx->optimize(WANTvalue | WANTinterpret);
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372 index.data[i] = (void *)idx;
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373 length = idx->toInteger();
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374 }
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375
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376 val = (Initializer *)value.data[i];
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377 val = val->semantic(sc, t->next);
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378 value.data[i] = (void *)val;
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379 length++;
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380 if (length == 0)
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381 error(loc, "array dimension overflow");
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382 if (length > dim)
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383 dim = length;
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384 }
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385 unsigned long amax = 0x80000000;
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386 if ((unsigned long) dim * t->next->size() >= amax)
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387 error(loc, "array dimension %u exceeds max of %llu", dim, amax / t->next->size());
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388 return this;
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389 }
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390
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391 /********************************
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392 * If possible, convert array initializer to array literal.
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393 */
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394
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395 Expression *ArrayInitializer::toExpression()
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396 { Expressions *elements;
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397 Expression *e;
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398
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399 //printf("ArrayInitializer::toExpression()\n");
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400 //static int i; if (++i == 2) halt();
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401 elements = new Expressions();
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402 for (size_t i = 0; i < value.dim; i++)
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403 {
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404 if (index.data[i])
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405 goto Lno;
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406 Initializer *iz = (Initializer *)value.data[i];
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407 if (!iz)
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408 goto Lno;
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409 Expression *ex = iz->toExpression();
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410 if (!ex)
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411 goto Lno;
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412 elements->push(ex);
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413 }
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414 e = new ArrayLiteralExp(loc, elements);
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415 e->type = type;
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416 return e;
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417
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418 Lno:
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419 delete elements;
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420 error(loc, "array initializers as expressions are not allowed");
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421 return NULL;
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422 }
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423
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424
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425 /********************************
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426 * If possible, convert array initializer to associative array initializer.
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427 */
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428
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429 Initializer *ArrayInitializer::toAssocArrayInitializer()
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430 { Expressions *keys;
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431 Expressions *values;
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432 Expression *e;
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433
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434 //printf("ArrayInitializer::toAssocArrayInitializer()\n");
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435 //static int i; if (++i == 2) halt();
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436 keys = new Expressions();
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437 keys->setDim(value.dim);
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438 values = new Expressions();
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439 values->setDim(value.dim);
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440
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441 for (size_t i = 0; i < value.dim; i++)
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442 {
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443 e = (Expression *)index.data[i];
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444 if (!e)
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445 goto Lno;
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446 keys->data[i] = (void *)e;
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447
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448 Initializer *iz = (Initializer *)value.data[i];
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449 if (!iz)
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450 goto Lno;
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451 e = iz->toExpression();
|
|
|
452 if (!e)
|
|
|
453 goto Lno;
|
|
|
454 values->data[i] = (void *)e;
|
|
|
455 }
|
|
|
456 e = new AssocArrayLiteralExp(loc, keys, values);
|
|
|
457 return new ExpInitializer(loc, e);
|
|
|
458
|
|
|
459 Lno:
|
|
|
460 delete keys;
|
|
|
461 delete values;
|
|
|
462 error(loc, "not an associative array initializer");
|
|
|
463 return this;
|
|
|
464 }
|
|
|
465
|
|
|
466
|
|
|
467 Type *ArrayInitializer::inferType(Scope *sc)
|
|
|
468 {
|
|
|
469 for (size_t i = 0; i < value.dim; i++)
|
|
|
470 {
|
|
|
471 if (index.data[i])
|
|
|
472 goto Lno;
|
|
|
473 }
|
|
|
474 if (value.dim)
|
|
|
475 {
|
|
|
476 Initializer *iz = (Initializer *)value.data[0];
|
|
|
477 if (iz)
|
|
|
478 { Type *t = iz->inferType(sc);
|
|
|
479 t = new TypeSArray(t, new IntegerExp(value.dim));
|
|
|
480 t = t->semantic(loc, sc);
|
|
|
481 return t;
|
|
|
482 }
|
|
|
483 }
|
|
|
484
|
|
|
485 Lno:
|
|
|
486 error(loc, "cannot infer type from this array initializer");
|
|
|
487 return Type::terror;
|
|
|
488 }
|
|
|
489
|
|
|
490
|
|
|
491 void ArrayInitializer::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
|
|
|
492 {
|
|
|
493 buf->writebyte('[');
|
|
|
494 for (int i = 0; i < index.dim; i++)
|
|
|
495 {
|
|
|
496 if (i > 0)
|
|
|
497 buf->writebyte(',');
|
|
|
498 Expression *ex = (Expression *)index.data[i];
|
|
|
499 if (ex)
|
|
|
500 {
|
|
|
501 ex->toCBuffer(buf, hgs);
|
|
|
502 buf->writebyte(':');
|
|
|
503 }
|
|
|
504 Initializer *iz = (Initializer *)value.data[i];
|
|
|
505 if (iz)
|
|
|
506 iz->toCBuffer(buf, hgs);
|
|
|
507 }
|
|
|
508 buf->writebyte(']');
|
|
|
509 }
|
|
|
510
|
|
|
511
|
|
|
512 /********************************** ExpInitializer ************************************/
|
|
|
513
|
|
|
514 ExpInitializer::ExpInitializer(Loc loc, Expression *exp)
|
|
|
515 : Initializer(loc)
|
|
|
516 {
|
|
|
517 this->exp = exp;
|
|
|
518 }
|
|
|
519
|
|
|
520 Initializer *ExpInitializer::syntaxCopy()
|
|
|
521 {
|
|
|
522 return new ExpInitializer(loc, exp->syntaxCopy());
|
|
|
523 }
|
|
|
524
|
|
|
525 Initializer *ExpInitializer::semantic(Scope *sc, Type *t)
|
|
|
526 {
|
|
|
527 //printf("ExpInitializer::semantic(%s), type = %s\n", exp->toChars(), t->toChars());
|
|
|
528 exp = exp->semantic(sc);
|
|
|
529 Type *tb = t->toBasetype();
|
|
|
530
|
|
|
531 /* Look for case of initializing a static array with a too-short
|
|
|
532 * string literal, such as:
|
|
|
533 * char[5] foo = "abc";
|
|
|
534 * Allow this by doing an explicit cast, which will lengthen the string
|
|
|
535 * literal.
|
|
|
536 */
|
|
|
537 if (exp->op == TOKstring && tb->ty == Tsarray && exp->type->ty == Tsarray)
|
|
|
538 { StringExp *se = (StringExp *)exp;
|
|
|
539
|
|
|
540 if (!se->committed && se->type->ty == Tsarray &&
|
|
|
541 ((TypeSArray *)se->type)->dim->toInteger() <
|
|
|
542 ((TypeSArray *)t)->dim->toInteger())
|
|
|
543 {
|
|
|
544 exp = se->castTo(sc, t);
|
|
|
545 goto L1;
|
|
|
546 }
|
|
|
547 }
|
|
|
548
|
|
|
549 // Look for the case of statically initializing an array
|
|
|
550 // with a single member.
|
|
|
551 if (tb->ty == Tsarray &&
|
|
|
552 !tb->next->equals(exp->type->toBasetype()->next) &&
|
|
|
553 exp->implicitConvTo(tb->next)
|
|
|
554 )
|
|
|
555 {
|
|
|
556 t = tb->next;
|
|
|
557 }
|
|
|
558
|
|
|
559 exp = exp->implicitCastTo(sc, t);
|
|
|
560 L1:
|
|
|
561 exp = exp->optimize(WANTvalue | WANTinterpret);
|
|
|
562 //printf("-ExpInitializer::semantic(): "); exp->print();
|
|
|
563 return this;
|
|
|
564 }
|
|
|
565
|
|
|
566 Type *ExpInitializer::inferType(Scope *sc)
|
|
|
567 {
|
|
|
568 //printf("ExpInitializer::inferType() %s\n", toChars());
|
|
|
569 exp = exp->semantic(sc);
|
|
|
570 exp = resolveProperties(sc, exp);
|
|
|
571 return exp->type;
|
|
|
572 }
|
|
|
573
|
|
|
574 Expression *ExpInitializer::toExpression()
|
|
|
575 {
|
|
|
576 return exp;
|
|
|
577 }
|
|
|
578
|
|
|
579
|
|
|
580 void ExpInitializer::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
|
|
|
581 {
|
|
|
582 exp->toCBuffer(buf, hgs);
|
|
|
583 }
|
|
|
584
|
|
|
585
|
|
|
586
|
