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0
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1 module dmd.IsExp;
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2
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3 import dmd.Expression;
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4 import dmd.Identifier;
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5 import dmd.ArrayTypes;
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6 import dmd.Type;
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7 import dmd.TOK;
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8 import dmd.OutBuffer;
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9 import dmd.Loc;
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10 import dmd.Scope;
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11 import dmd.HdrGenState;
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12 import dmd.TY;
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13 import dmd.TypeEnum;
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14 import dmd.STC;
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15 import dmd.TypeClass;
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16 import dmd.TemplateParameter;
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17 import dmd.BaseClass;
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18 import dmd.ClassDeclaration;
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19 import dmd.TypeStruct;
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20 import dmd.TypeTypedef;
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21 import dmd.IntegerExp;
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22 import dmd.AliasDeclaration;
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23 import dmd.Dsymbol;
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24 import dmd.TypeTuple;
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25 import dmd.TypeDelegate;
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26 import dmd.Declaration;
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27 import dmd.TypeFunction;
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28 import dmd.MATCH;
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29 import dmd.TypePointer;
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30 import dmd.Argument;
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31
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32 class IsExp : Expression
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33 {
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34 /* is(targ id tok tspec)
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35 * is(targ id == tok2)
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36 */
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37 Type targ;
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38 Identifier id; // can be null
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39 TOK tok; // ':' or '=='
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40 Type tspec; // can be null
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41 TOK tok2; // 'struct', 'union', 'typedef', etc.
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42 TemplateParameters parameters;
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43
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44 this(Loc loc, Type targ, Identifier id, TOK tok, Type tspec, TOK tok2, TemplateParameters parameters)
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45 {
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46 super(loc, TOK.TOKis, IsExp.sizeof);
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47
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48 this.targ = targ;
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49 this.id = id;
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50 this.tok = tok;
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51 this.tspec = tspec;
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52 this.tok2 = tok2;
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53 this.parameters = parameters;
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54 }
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55
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56 Expression syntaxCopy()
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57 {
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42
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58 // This section is identical to that in TemplateDeclaration.syntaxCopy()
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59 TemplateParameters p = null;
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60 if (parameters)
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61 {
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62 p = new TemplateParameters();
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63 p.setDim(parameters.dim);
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64 for (int i = 0; i < p.dim; i++)
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65 {
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66 TemplateParameter tp = cast(TemplateParameter)parameters.data[i];
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67 p.data[i] = cast(void*)tp.syntaxCopy();
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68 }
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69 }
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70
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71 return new IsExp(loc,
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72 targ.syntaxCopy(),
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73 id,
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74 tok,
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75 tspec ? tspec.syntaxCopy() : null,
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76 tok2,
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77 p);
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0
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78 }
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79
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80 Expression semantic(Scope sc)
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81 {
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82 Type tded;
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83
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84 /* is(targ id tok tspec)
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85 * is(targ id == tok2)
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86 */
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87
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88 //printf("IsExp.semantic(%s)\n", toChars());
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89 if (id && !(sc.flags & SCOPE.SCOPEstaticif))
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90 error("can only declare type aliases within static if conditionals");
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91
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92 Type t = targ.trySemantic(loc, sc);
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93 if (!t)
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94 goto Lno; // errors, so condition is false
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95 targ = t;
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96 if (tok2 != TOK.TOKreserved)
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97 {
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98 switch (tok2)
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99 {
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100 case TOKtypedef:
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101 if (targ.ty != Ttypedef)
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102 goto Lno;
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103 tded = (cast(TypeTypedef)targ).sym.basetype;
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104 break;
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105
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106 case TOKstruct:
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107 if (targ.ty != Tstruct)
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108 goto Lno;
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109 if ((cast(TypeStruct)targ).sym.isUnionDeclaration())
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110 goto Lno;
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111 tded = targ;
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112 break;
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113
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114 case TOKunion:
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115 if (targ.ty != Tstruct)
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116 goto Lno;
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117 if (!(cast(TypeStruct)targ).sym.isUnionDeclaration())
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118 goto Lno;
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119 tded = targ;
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120 break;
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121
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122 case TOKclass:
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123 if (targ.ty != Tclass)
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124 goto Lno;
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125 if ((cast(TypeClass)targ).sym.isInterfaceDeclaration())
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126 goto Lno;
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127 tded = targ;
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128 break;
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129
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130 case TOKinterface:
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131 if (targ.ty != Tclass)
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132 goto Lno;
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133 if (!(cast(TypeClass)targ).sym.isInterfaceDeclaration())
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134 goto Lno;
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135 tded = targ;
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136 break;
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137 version (DMDV2) {
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138 case TOKconst:
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139 if (!targ.isConst())
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140 goto Lno;
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141 tded = targ;
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142 break;
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143
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144 case TOKinvariant:
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145 case TOKimmutable:
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146 if (!targ.isInvariant())
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147 goto Lno;
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148 tded = targ;
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149 break;
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150
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151 case TOKshared:
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152 if (!targ.isShared())
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153 goto Lno;
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154 tded = targ;
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155 break;
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156 }
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157
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158 case TOKsuper:
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159 // If class or interface, get the base class and interfaces
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160 if (targ.ty != Tclass)
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161 goto Lno;
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162 else
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163 { ClassDeclaration cd = (cast(TypeClass)targ).sym;
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164 Arguments args = new Arguments;
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165 args.reserve(cd.baseclasses.dim);
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166 for (size_t i = 0; i < cd.baseclasses.dim; i++)
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167 {
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168 BaseClass b = cast(BaseClass)cd.baseclasses.data[i];
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169 args.push(cast(void*)new Argument(STCin, b.type, null, null));
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170 }
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171 tded = new TypeTuple(args);
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172 }
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173 break;
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174
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175 case TOKenum:
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176 if (targ.ty != Tenum)
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177 goto Lno;
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178 tded = (cast(TypeEnum)targ).sym.memtype;
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179 break;
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180
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181 case TOKdelegate:
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182 if (targ.ty != Tdelegate)
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183 goto Lno;
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184 tded = (cast(TypeDelegate)targ).next; // the underlying function type
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185 break;
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186
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187 case TOKfunction:
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188 {
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189 if (targ.ty != Tfunction)
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190 goto Lno;
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191 tded = targ;
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192
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193 /* Generate tuple from function parameter types.
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194 */
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195 assert(tded.ty == Tfunction);
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196 Arguments params = (cast(TypeFunction)tded).parameters;
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197 size_t dim = Argument.dim(params);
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198 Arguments args = new Arguments;
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199 args.reserve(dim);
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200 for (size_t i = 0; i < dim; i++)
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201 {
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202 Argument arg = Argument.getNth(params, i);
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203 assert(arg && arg.type);
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204 args.push(cast(void*)new Argument(arg.storageClass, arg.type, null, null));
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205 }
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206 tded = new TypeTuple(args);
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207 break;
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208 }
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209
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210 case TOKreturn:
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211 /* Get the 'return type' for the function,
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212 * delegate, or pointer to function.
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213 */
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214 if (targ.ty == Tfunction)
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215 tded = (cast(TypeFunction)targ).next;
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216 else if (targ.ty == Tdelegate)
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217 { tded = (cast(TypeDelegate)targ).next;
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218 tded = (cast(TypeFunction)tded).next;
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219 }
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220 else if (targ.ty == Tpointer &&
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221 (cast(TypePointer)targ).next.ty == Tfunction)
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222 { tded = (cast(TypePointer)targ).next;
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223 tded = (cast(TypeFunction)tded).next;
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224 }
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225 else
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226 goto Lno;
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227 break;
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228
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229 default:
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230 assert(0);
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231 }
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232 goto Lyes;
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233 }
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234 else if (id && tspec)
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235 {
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236 /* Evaluate to true if targ matches tspec.
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237 * If true, declare id as an alias for the specialized type.
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238 */
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239
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240 MATCH m;
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241 assert(parameters && parameters.dim);
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242
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243 scope Objects dedtypes = new Objects();
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244 dedtypes.setDim(parameters.dim);
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245 dedtypes.zero();
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246
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247 m = targ.deduceType(null, tspec, parameters, dedtypes);
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248 if (m == MATCHnomatch ||
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249 (m != MATCHexact && tok == TOKequal))
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250 {
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251 goto Lno;
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252 }
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253 else
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254 {
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255 tded = cast(Type)dedtypes.data[0];
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256 if (!tded)
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257 tded = targ;
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258
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259 scope Objects tiargs = new Objects();
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260 tiargs.setDim(1);
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261 tiargs.data[0] = cast(void*)targ;
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262
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263 /* Declare trailing parameters
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264 */
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265 for (int i = 1; i < parameters.dim; i++)
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266 {
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267 TemplateParameter tp = cast(TemplateParameter)parameters.data[i];
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268 Declaration s = null;
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269
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270 m = tp.matchArg(sc, tiargs, i, parameters, dedtypes, &s);
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271 if (m == MATCHnomatch)
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272 goto Lno;
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273 s.semantic(sc);
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274 if (!sc.insert(s))
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275 error("declaration %s is already defined", s.toChars());
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276 static if (false) {
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277 Object o = cast(Object)dedtypes.data[i];
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278 Dsymbol s = TemplateDeclaration.declareParameter(loc, sc, tp, o);
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279 }
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280 if (sc.sd)
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13
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281 s.addMember(sc, sc.sd, true);
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0
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282 }
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283
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284 goto Lyes;
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285 }
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286 }
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287 else if (id)
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288 {
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289 /* Declare id as an alias for type targ. Evaluate to true
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290 */
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291 tded = targ;
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292 goto Lyes;
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293 }
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294 else if (tspec)
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295 {
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296 /* Evaluate to true if targ matches tspec
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297 * is(targ == tspec)
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298 * is(targ : tspec)
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299 */
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300 tspec = tspec.semantic(loc, sc);
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301 //printf("targ = %s\n", targ.toChars());
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302 //printf("tspec = %s\n", tspec.toChars());
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303 if (tok == TOKcolon)
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304 {
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305 if (targ.implicitConvTo(tspec))
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306 goto Lyes;
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307 else
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308 goto Lno;
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309 }
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310 else /* == */
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311 {
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312 if (targ.equals(tspec))
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313 goto Lyes;
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314 else
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315 goto Lno;
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316 }
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317 }
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318
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319 Lyes:
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320 if (id)
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321 {
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322 Dsymbol s = new AliasDeclaration(loc, id, tded);
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323 s.semantic(sc);
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324 if (!sc.insert(s))
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325 error("declaration %s is already defined", s.toChars());
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326 if (sc.sd)
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13
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327 s.addMember(sc, sc.sd, true);
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0
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328 }
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329 //printf("Lyes\n");
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330 return new IntegerExp(loc, 1, Type.tbool);
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331
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332 Lno:
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333 //printf("Lno\n");
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334 return new IntegerExp(loc, 0, Type.tbool);
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335 }
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336
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337 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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338 {
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339 assert(false);
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340 }
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341 }
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342
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