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