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1 module dmd.StructInitializer;
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2
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3 import dmd.Initializer;
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2
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4 import dmd.TOK;
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5 import dmd.FuncLiteralDeclaration;
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6 import dmd.TypeFunction;
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56
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7 import dmd.StructDeclaration;
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8 import dmd.StructLiteralExp;
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0
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9 import dmd.ArrayTypes;
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10 import dmd.Array;
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11 import dmd.Loc;
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12 import dmd.Type;
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13 import dmd.Scope;
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14 import dmd.Identifier;
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2
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15 import dmd.CompoundStatement;
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0
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16 import dmd.AggregateDeclaration;
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17 import dmd.OutBuffer;
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18 import dmd.HdrGenState;
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19 import dmd.Expression;
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2
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20 import dmd.TypeStruct;
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21 import dmd.TY;
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22 import dmd.VarDeclaration;
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23 import dmd.Dsymbol;
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24 import dmd.Util;
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25 import dmd.ExpInitializer;
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26 import dmd.FuncExp;
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27 import dmd.LINK;
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0
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28
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29 import dmd.backend.dt_t;
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30
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31 class StructInitializer : Initializer
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32 {
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33 Identifiers field; // of Identifier *'s
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34 Initializers value; // parallel array of Initializer *'s
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35
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36 Array vars; // parallel array of VarDeclaration *'s
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37 AggregateDeclaration ad; // which aggregate this is for
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38
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39 this(Loc loc)
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40 {
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41 super(loc);
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2
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42 ad = null;
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43
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44 field = new Identifiers();
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45 value = new Initializers();
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51
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46
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47 vars = new Array();
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48 }
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49
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50 Initializer syntaxCopy()
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51 {
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52 StructInitializer ai = new StructInitializer(loc);
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53
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54 assert(field.dim == value.dim);
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55 ai.field.setDim(field.dim);
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56 ai.value.setDim(value.dim);
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57 for (int i = 0; i < field.dim; i++)
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58 {
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59 ai.field.data[i] = field.data[i];
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60
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61 Initializer init = cast(Initializer)value.data[i];
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62 init = init.syntaxCopy();
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63 ai.value.data[i] = cast(void*)init;
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64 }
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65
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66 return ai;
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67 }
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68
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69 void addInit(Identifier field, Initializer value)
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70 {
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71 //printf("StructInitializer.addInit(field = %p, value = %p)\n", field, value);
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72 this.field.push(cast(void*)field);
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73 this.value.push(cast(void*)value);
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74 }
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75
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76 Initializer semantic(Scope sc, Type t)
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77 {
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78 TypeStruct ts;
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79 int errors = 0;
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80
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81 //printf("StructInitializer.semantic(t = %s) %s\n", t.toChars(), toChars());
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82 vars.setDim(field.dim);
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83 t = t.toBasetype();
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84 if (t.ty == Tstruct)
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85 {
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86 uint i;
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87 uint fieldi = 0;
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88
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89 ts = cast(TypeStruct)t;
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90 ad = ts.sym;
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91 for (i = 0; i < field.dim; i++)
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92 {
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93 Identifier id = cast(Identifier)field.data[i];
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94 Initializer val = cast(Initializer)value.data[i];
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95 Dsymbol s;
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96 VarDeclaration v;
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97
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98 if (id is null)
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99 {
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100 if (fieldi >= ad.fields.dim)
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101 {
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102 error(loc, "too many initializers for %s", ad.toChars());
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103 field.remove(i);
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104 i--;
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105 continue;
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106 }
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107 else
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108 {
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109 s = cast(Dsymbol)ad.fields.data[fieldi];
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110 }
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111 }
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112 else
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113 {
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114 //s = ad.symtab.lookup(id);
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115 s = ad.search(loc, id, 0);
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116 if (!s)
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117 {
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118 error(loc, "'%s' is not a member of '%s'", id.toChars(), t.toChars());
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119 continue;
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120 }
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121
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122 // Find out which field index it is
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123 for (fieldi = 0; 1; fieldi++)
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124 {
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125 if (fieldi >= ad.fields.dim)
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126 {
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127 s.error("is not a per-instance initializable field");
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128 break;
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129 }
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130 if (s == cast(Dsymbol)ad.fields.data[fieldi])
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131 break;
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132 }
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133 }
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134 if (s && (v = s.isVarDeclaration()) !is null)
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135 {
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136 val = val.semantic(sc, v.type);
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137 value.data[i] = cast(void*)val;
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138 vars.data[i] = cast(void*)v;
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139 }
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140 else
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141 {
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142 error(loc, "%s is not a field of %s", id ? id.toChars() : s.toChars(), ad.toChars());
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143 errors = 1;
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144 }
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145 fieldi++;
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146 }
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147 }
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148 else if (t.ty == Tdelegate && value.dim == 0)
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149 {
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150 /* Rewrite as empty delegate literal { }
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151 */
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152 Arguments arguments = new Arguments;
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153 Type tf = new TypeFunction(arguments, null, 0, LINK.LINKd);
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154 FuncLiteralDeclaration fd = new FuncLiteralDeclaration(loc, Loc(0), tf, TOK.TOKdelegate, null);
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155 fd.fbody = new CompoundStatement(loc, new Statements());
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156 fd.endloc = loc;
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157 Expression e = new FuncExp(loc, fd);
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158 ExpInitializer ie = new ExpInitializer(loc, e);
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159 return ie.semantic(sc, t);
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160 }
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161 else
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162 {
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163 error(loc, "a struct is not a valid initializer for a %s", t.toChars());
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164 errors = 1;
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165 }
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166 if (errors)
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167 {
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168 field.setDim(0);
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169 value.setDim(0);
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170 vars.setDim(0);
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171 }
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172 return this;
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0
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173 }
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174
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175 /***************************************
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176 * This works by transforming a struct initializer into
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177 * a struct literal. In the future, the two should be the
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178 * same thing.
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179 */
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180 Expression toExpression()
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181 {
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56
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182 Expression e;
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183
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184 //printf("StructInitializer.toExpression() %s\n", toChars());
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185 if (!ad) // if fwd referenced
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186 {
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187 return null;
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188 }
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189 StructDeclaration sd = ad.isStructDeclaration();
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190 if (!sd)
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191 return null;
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192 Expressions elements = new Expressions();
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193 for (size_t i = 0; i < value.dim; i++)
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194 {
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195 if (field.data[i])
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196 goto Lno;
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197 Initializer iz = cast(Initializer)value.data[i];
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198 if (!iz)
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199 goto Lno;
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200 Expression ex = iz.toExpression();
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201 if (!ex)
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202 goto Lno;
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203 elements.push(cast(void*)ex);
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204 }
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205 e = new StructLiteralExp(loc, sd, elements);
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206 e.type = sd.type;
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207 return e;
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208
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209 Lno:
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210 delete elements;
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211 //error(loc, "struct initializers as expressions are not allowed");
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212 return null;
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0
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213 }
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214
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215 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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216 {
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217 assert(false);
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218 }
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219
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220 dt_t* toDt()
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221 {
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222 assert(false);
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223 }
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224
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225 StructInitializer isStructInitializer() { return this; }
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226 } |
