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0
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1 module dmd.VarExp;
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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.InterState;
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6 import dmd.OutBuffer;
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7 import dmd.Loc;
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8 import dmd.Scope;
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9 import dmd.InlineCostState;
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10 import dmd.FuncLiteralDeclaration;
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11 import dmd.VarDeclaration;
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12 import dmd.Dsymbol;
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13 import dmd.FuncDeclaration;
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14 import dmd.InlineDoState;
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15 import dmd.HdrGenState;
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16 import dmd.TOK;
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17 import dmd.TY;
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18 import dmd.STC;
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19 import dmd.SymbolExp;
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20 import dmd.Type;
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63
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21 import dmd.interpret.Util;
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0
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22 import dmd.backend.dt_t;
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23 import dmd.expression.Util;
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24
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25 // Variable
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26
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27 class VarExp : SymbolExp
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28 {
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29 this(Loc loc, Declaration var, int hasOverloads = 0)
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30 {
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31 super(loc, TOK.TOKvar, VarExp.sizeof, var, hasOverloads);
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32
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33 //printf("VarExp(this = %p, '%s', loc = %s)\n", this, var.toChars(), loc.toChars());
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34 //if (strcmp(var.ident.toChars(), "func") == 0) halt();
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35 this.type = var.type;
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36 }
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37
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45
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38 bool equals(Object o)
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0
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39 {
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40 assert(false);
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41 }
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42
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43 Expression semantic(Scope sc)
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44 {
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45 FuncLiteralDeclaration fd;
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46
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47 version (LOGSEMANTIC) {
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48 printf("VarExp.semantic(%s)\n", toChars());
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49 }
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50 if (!type)
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51 {
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52 type = var.type;
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53 static if (false) {
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54 if (var.storage_class & STC.STClazy)
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55 {
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56 TypeFunction tf = new TypeFunction(null, type, 0, LINK.LINKd);
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57 type = new TypeDelegate(tf);
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58 type = type.semantic(loc, sc);
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59 }
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60 }
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61 }
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62
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63 /* Fix for 1161 doesn't work because it causes protection
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64 * problems when instantiating imported templates passing private
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65 * variables as alias template parameters.
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66 */
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67 //accessCheck(loc, sc, null, var);
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68
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69 VarDeclaration v = var.isVarDeclaration();
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70 if (v)
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71 {
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72 static if (false) {
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73 if ((v.isConst() || v.isInvariant()) && type.toBasetype().ty != TY.Tsarray && v.init)
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74 {
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75 ExpInitializer ei = v.init.isExpInitializer();
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76 if (ei)
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77 {
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78 //ei.exp.implicitCastTo(sc, type).print();
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79 return ei.exp.implicitCastTo(sc, type);
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80 }
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81 }
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82 }
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83 v.checkNestedReference(sc, loc);
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84 version (DMDV2) {
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85 static if (true) {
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86 if (sc.func)
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87 {
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88 /* Determine if sc.func is pure or if any function that
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89 * encloses it is also pure.
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90 */
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91 bool hasPureParent = false;
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92 for (FuncDeclaration outerfunc = sc.func; outerfunc;)
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93 {
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94 if (outerfunc.isPure())
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95 {
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96 hasPureParent = true;
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97 break;
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98 }
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99 Dsymbol parent = outerfunc.toParent2();
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100 if (!parent)
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101 break;
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102 outerfunc = parent.isFuncDeclaration();
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103 }
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104
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105 /* If ANY of its enclosing functions are pure,
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106 * it cannot do anything impure.
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107 * If it is pure, it cannot access any mutable variables other
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108 * than those inside itself
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109 */
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110 if (hasPureParent && !sc.intypeof && v.isDataseg() && !v.isInvariant())
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111 {
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112 error("pure function '%s' cannot access mutable static data '%s'",
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113 sc.func.toChars(), v.toChars());
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114 }
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115 else if (sc.func.isPure() && sc.parent != v.parent && !sc.intypeof && !v.isInvariant() && !(v.storage_class & STC.STCmanifest))
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116 {
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117 error("pure nested function '%s' cannot access mutable data '%s'", sc.func.toChars(), v.toChars());
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118 if (v.isEnumDeclaration())
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119 error("enum");
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120 }
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121 }
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122 } else {
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123 if (sc.func && sc.func.isPure() && !sc.intypeof)
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124 {
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125 if (v.isDataseg() && !v.isInvariant())
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126 error("pure function '%s' cannot access mutable static data '%s'", sc.func.toChars(), v.toChars());
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127 }
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128 }
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129 }
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130 }
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131 else
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132 {
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133 static if (false) {
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134 if ((fd = var.isFuncLiteralDeclaration()) !is null)
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135 {
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136 Expression e = new FuncExp(loc, fd);
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137 e.type = type;
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138 return e;
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139 }
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140 }
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141 }
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142
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143 return this;
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144 }
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145
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146 Expression optimize(int result)
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147 {
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148 return fromConstInitializer(result, this);
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149 }
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150
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63
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151 Expression interpret(InterState istate)
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0
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152 {
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153 version (LOG) {
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154 printf("VarExp.interpret() %.*s\n", toChars());
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155 }
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156 return getVarExp(loc, istate, var);
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0
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157 }
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158
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159 void dump(int indent)
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160 {
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161 assert(false);
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162 }
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163
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164 string toChars()
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165 {
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166 return var.toChars();
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167 }
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168
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169 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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170 {
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171 buf.writestring(var.toChars());
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172 }
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173
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174 void checkEscape()
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175 {
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176 VarDeclaration v = var.isVarDeclaration();
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177 if (v)
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178 {
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179 Type tb = v.type.toBasetype();
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180 // if reference type
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181 if (tb.ty == TY.Tarray || tb.ty == TY.Tsarray || tb.ty == TY.Tclass)
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182 {
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183 if ((v.isAuto() || v.isScope()) && !v.noauto)
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184 error("escaping reference to scope local %s", v.toChars());
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185 else if (v.storage_class & STC.STCvariadic)
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186 error("escaping reference to variadic parameter %s", v.toChars());
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187 }
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188 }
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189 }
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190
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191 version (DMDV2) {
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192 int isLvalue()
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193 {
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194 if (var.storage_class & STClazy)
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195 return 0;
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196 return 1;
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197 }
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198 }
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199 Expression toLvalue(Scope sc, Expression e)
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200 {
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201 static if (false) {
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202 tym = tybasic(e1.ET.Tty);
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203 if (!(tyscalar(tym) ||
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204 tym == TYM.TYstruct ||
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205 tym == TYM.TYarray && e.Eoper == TOK.TOKaddr))
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206 {
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207 synerr(EM_lvalue); // lvalue expected
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208 }
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209 }
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210 if (var.storage_class & STC.STClazy)
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211 error("lazy variables cannot be lvalues");
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212
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213 return this;
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214 }
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215
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216 Expression modifiableLvalue(Scope sc, Expression e)
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217 {
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218 //printf("VarExp::modifiableLvalue('%s')\n", var.toChars());
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219 if (type && type.toBasetype().ty == TY.Tsarray)
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220 error("cannot change reference to static array '%s'", var.toChars());
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221
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222 var.checkModify(loc, sc, type);
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223
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224 // See if this expression is a modifiable lvalue (i.e. not const)
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225 return toLvalue(sc, e);
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226 }
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227
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228 dt_t** toDt(dt_t** pdt)
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229 {
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230 assert(false);
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231 }
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232
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233 void scanForNestedRef(Scope sc)
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234 {
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235 assert(false);
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236 }
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237
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238 int inlineCost(InlineCostState* ics)
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239 {
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240 //printf("VarExp.inlineCost() %s\n", toChars());
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241 return 1;
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242 }
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243
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244 Expression doInline(InlineDoState ids)
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245 {
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246 int i;
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247
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248 //printf("VarExp.doInline(%s)\n", toChars());
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249 for (i = 0; i < ids.from.dim; i++)
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250 {
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251 if (var == cast(Declaration)ids.from.data[i])
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252 {
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253 VarExp ve = cast(VarExp)copy();
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254
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255 ve.var = cast(Declaration)ids.to.data[i];
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256 return ve;
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257 }
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258 }
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259 return this;
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260 }
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261 }
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262
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