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1 module dmd.DotVarExp;
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2
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3 import dmd.Expression;
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4 import dmd.Declaration;
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5 import dmd.backend.elem;
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6 import dmd.UnaExp;
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7 import dmd.InterState;
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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.IRState;
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12 import dmd.HdrGenState;
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13 import dmd.TOK;
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14 import dmd.TupleDeclaration;
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15 import dmd.ArrayTypes;
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16 import dmd.DsymbolExp;
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17 import dmd.TupleExp;
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18 import dmd.Global;
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19 import dmd.Type;
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20 import dmd.Dsymbol;
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21 import dmd.AggregateDeclaration;
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22 import dmd.VarDeclaration;
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23 import dmd.WANT;
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24 import dmd.TY;
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25 import dmd.ErrorExp;
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26 import dmd.FuncDeclaration;
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27 import dmd.STC;
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28 import dmd.GlobalExpressions;
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29 import dmd.VarExp;
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30 import dmd.StructLiteralExp;
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31 import dmd.PREC;
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32
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33 import dmd.expression.Util;
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34 import dmd.codegen.Util;
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35 import dmd.backend.Util;
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36 import dmd.backend.mTY;
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37 import dmd.backend.OPER;
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38 import dmd.backend.TYM;
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39
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40 class DotVarExp : UnaExp
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41 {
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42 Declaration var;
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43
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44 int hasOverloads;
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45
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46 this(Loc loc, Expression e, Declaration var, int hasOverloads = 0)
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47 {
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48 super(loc, TOK.TOKdotvar, DotVarExp.sizeof, e);
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49 //printf("DotVarExp()\n");
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50 this.var = var;
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51 this.hasOverloads = hasOverloads;
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52 }
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53
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54 Expression semantic(Scope sc)
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55 {
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56 version (LOGSEMANTIC) {
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57 printf("DotVarExp.semantic('%s')\n", toChars());
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58 }
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59 if (!type)
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60 {
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61 var = var.toAlias().isDeclaration();
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62
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63 TupleDeclaration tup = var.isTupleDeclaration();
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64 if (tup)
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65 {
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66 /* Replace:
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67 * e1.tuple(a, b, c)
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68 * with:
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69 * tuple(e1.a, e1.b, e1.c)
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70 */
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71 Expressions exps = new Expressions;
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72
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73 exps.reserve(tup.objects.dim);
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74 for (size_t i = 0; i < tup.objects.dim; i++)
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75 {
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76 Object o = cast(Object)tup.objects.data[i];
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77 if (auto e = cast(Expression)o)
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78 {
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79 if (e.op != TOK.TOKdsymbol)
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80 error("%s is not a member", e.toChars());
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81 else
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82 {
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83 DsymbolExp ve = cast(DsymbolExp)e;
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84 e = new DotVarExp(loc, e1, ve.s.isDeclaration());
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85 exps.push(cast(void*)e);
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86 }
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87 } else {
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88 error("%s is not an expression", o.toString());
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89 }
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90 }
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91 Expression e = new TupleExp(loc, exps);
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92 e = e.semantic(sc);
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93 return e;
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94 }
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95
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96 e1 = e1.semantic(sc);
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97 type = var.type;
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98 if (!type && global.errors)
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99 {
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100 // var is goofed up, just return 0
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101 return new ErrorExp();
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102 }
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103 assert(type);
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104
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105 if (!var.isFuncDeclaration()) // for functions, do checks after overload resolution
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106 {
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107 Type t1 = e1.type;
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108 if (t1.ty == TY.Tpointer)
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109 t1 = t1.nextOf();
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110
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111 type = type.addMod(t1.mod);
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112
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113 Dsymbol vparent = var.toParent();
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114 AggregateDeclaration ad = vparent ? vparent.isAggregateDeclaration() : null;
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115 e1 = getRightThis(loc, sc, ad, e1, var);
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116 if (!sc.noaccesscheck)
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117 accessCheck(loc, sc, e1, var);
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118
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119 VarDeclaration v = var.isVarDeclaration();
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120 Expression e = expandVar(WANT.WANTvalue, v);
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121 if (e)
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122 return e;
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123 }
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124 }
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125 //printf("-DotVarExp.semantic('%s')\n", toChars());
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126 return this;
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127 }
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128
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129 int isLvalue()
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130 {
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58
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131 return 1;
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0
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132 }
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133
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134 Expression toLvalue(Scope sc, Expression e)
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135 {
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136 //printf("DotVarExp::toLvalue(%s)\n", toChars());
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137 return this;
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138 }
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139
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140 Expression modifiableLvalue(Scope sc, Expression e)
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141 {
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142 static if (false) {
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143 printf("DotVarExp::modifiableLvalue(%s)\n", toChars());
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144 printf("e1.type = %s\n", e1.type.toChars());
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145 printf("var.type = %s\n", var.type.toChars());
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146 }
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147
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148 if (var.isCtorinit())
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149 {
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150 // It's only modifiable if inside the right constructor
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151 Dsymbol s = sc.func;
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152 while (true)
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153 {
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154 FuncDeclaration fd = null;
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155 if (s)
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156 fd = s.isFuncDeclaration();
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157 if (fd && ((fd.isCtorDeclaration() && var.storage_class & STC.STCfield) ||
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158 (fd.isStaticCtorDeclaration() && !(var.storage_class & STC.STCfield))) &&
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159 fd.toParent() == var.toParent() && e1.op == TOK.TOKthis)
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160 {
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161 VarDeclaration v = var.isVarDeclaration();
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162 assert(v);
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163 v.ctorinit = 1;
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164 //printf("setting ctorinit\n");
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165 }
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166 else
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167 {
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168 if (s)
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169 {
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170 s = s.toParent2();
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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 string p = var.isStatic() ? "static " : "";
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176 error("can only initialize %sconst member %s inside %sconstructor", p, var.toChars(), p);
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177 }
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178 }
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179 break;
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180 }
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181 }
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182 else
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183 {
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184 version (DMDV2) {
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185 Type t1 = e1.type.toBasetype();
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186
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187 if (!t1.isMutable() || (t1.ty == TY.Tpointer && !t1.nextOf().isMutable()) ||
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188 !var.type.isMutable() || !var.type.isAssignable() || var.storage_class & STC.STCmanifest)
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189 {
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190 error("cannot modify const/immutable expression %s", toChars());
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191 }
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192 }
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193 }
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194
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195 return this;
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196 }
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197
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198 Expression optimize(int result)
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199 {
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200 //printf("DotVarExp.optimize(result = x%x) %s\n", result, toChars());
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201 e1 = e1.optimize(result);
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202
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203 if (e1.op == TOK.TOKvar)
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204 {
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205 VarExp ve = cast(VarExp)e1;
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206 VarDeclaration v = ve.var.isVarDeclaration();
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207 Expression e = expandVar(result, v);
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208 if (e && e.op == TOK.TOKstructliteral)
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209 {
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210 StructLiteralExp sle = cast(StructLiteralExp)e;
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211 VarDeclaration vf = var.isVarDeclaration();
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212 if (vf)
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213 {
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214 e = sle.getField(type, vf.offset);
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215 if (e && e !is EXP_CANT_INTERPRET)
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216 return e;
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217 }
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218 }
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219 }
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220 else if (e1.op == TOK.TOKstructliteral)
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221 {
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222 StructLiteralExp sle = cast(StructLiteralExp)e1;
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223 VarDeclaration vf = var.isVarDeclaration();
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224 if (vf)
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225 {
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226 Expression e = sle.getField(type, vf.offset);
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227 if (e && e !is EXP_CANT_INTERPRET)
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228 return e;
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229 }
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230 }
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231
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232 return this;
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233 }
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234
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63
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235 Expression interpret(InterState istate)
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0
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236 {
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237 assert(false);
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238 }
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239
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240 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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241 {
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242 expToCBuffer(buf, hgs, e1, PREC.PREC_primary);
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243 buf.writeByte('.');
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244 buf.writestring(var.toChars());
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245 }
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246
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247 void dump(int indent)
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248 {
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249 assert(false);
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250 }
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251
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252 elem* toElem(IRState* irs)
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253 {
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254 // *(&e + offset)
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255 //printf("DotVarExp.toElem('%s')\n", toChars());
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256
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257 VarDeclaration v = var.isVarDeclaration();
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258 if (!v)
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259 {
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260 error("%s is not a field, but a %s", var.toChars(), var.kind());
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261 }
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262
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263 elem* e = e1.toElem(irs);
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264 Type tb1 = e1.type.toBasetype();
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265
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266 if (tb1.ty != TY.Tclass && tb1.ty != TY.Tpointer)
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267 //e = el_una(OPaddr, TYnptr, e);
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268 e = addressElem(e, tb1);
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269
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270 e = el_bin(OPER.OPadd, TYM.TYnptr, e, el_long(TYM.TYint, v ? v.offset : 0));
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271 e = el_una(OPER.OPind, type.totym(), e);
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272 if (tybasic(e.Ety) == TYM.TYstruct)
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273 {
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274 e.Enumbytes = cast(uint)type.size();
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275 }
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276 el_setLoc(e,loc);
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277
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278 return e;
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279 }
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280 }
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281
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