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72
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1 module dmd.PtrExp;
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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.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.Type;
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9 import dmd.OutBuffer;
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10 import dmd.Loc;
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11 import dmd.Scope;
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12 import dmd.IRState;
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13 import dmd.HdrGenState;
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0
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14 import dmd.TOK;
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15 import dmd.GlobalExpressions;
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16 import dmd.SymOffExp;
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17 import dmd.AddrExp;
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18 import dmd.VarDeclaration;
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19 import dmd.StructLiteralExp;
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20 import dmd.TypePointer;
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21 import dmd.TypeArray;
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22 import dmd.ErrorExp;
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23 import dmd.TY;
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24 import dmd.expression.Ptr;
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25 import dmd.expression.Util;
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26
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27 import dmd.backend.Util;
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28 import dmd.backend.TYM;
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29 import dmd.backend.mTY;
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72
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30 import dmd.backend.OPER;
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31
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0
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32 class PtrExp : UnaExp
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33 {
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34 this(Loc loc, Expression e)
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35 {
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36 super(loc, TOK.TOKstar, PtrExp.sizeof, e);
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37 // if (e.type)
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38 // type = ((TypePointer *)e.type).next;
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39 }
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40
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41 this(Loc loc, Expression e, Type t)
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42 {
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43 super(loc, TOKstar, PtrExp.sizeof, e);
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44 type = t;
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45 }
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46
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72
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47 override Expression semantic(Scope sc)
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0
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48 {
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49 version (LOGSEMANTIC) {
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50 printf("PtrExp::semantic('%s')\n", toChars());
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51 }
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52 if (!type)
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53 {
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54 UnaExp.semantic(sc);
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55 e1 = resolveProperties(sc, e1);
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56 if (!e1.type)
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57 writef("PtrExp.semantic('%s')\n", toChars());
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58 Expression e = op_overload(sc);
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59 if (e)
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60 return e;
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61 Type tb = e1.type.toBasetype();
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62 switch (tb.ty)
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63 {
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64 case Tpointer:
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65 type = (cast(TypePointer)tb).next;
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66 break;
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67
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68 case Tsarray:
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69 case Tarray:
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70 type = (cast(TypeArray)tb).next;
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71 e1 = e1.castTo(sc, type.pointerTo());
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72 break;
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73
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74 default:
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75 error("can only * a pointer, not a '%s'", e1.type.toChars());
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76 return new ErrorExp();
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77 }
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78 rvalue();
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79 }
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80 return this;
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81 }
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82
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72
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83 override int isLvalue()
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0
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84 {
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61
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85 return 1;
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0
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86 }
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87
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72
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88 override Expression toLvalue(Scope sc, Expression e)
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0
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89 {
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90 static if (false) {
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91 tym = tybasic(e1.ET.Tty);
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92 if (!(tyscalar(tym) ||
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93 tym == TYstruct ||
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94 tym == TYarray && e.Eoper == TOKaddr)
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95 )
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96 synerr(EM_lvalue); // lvalue expected
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97 }
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98 return this;
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99 }
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100
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101 version (DMDV2) {
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72
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102 override Expression modifiableLvalue(Scope sc, Expression e)
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0
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103 {
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104 //printf("PtrExp.modifiableLvalue() %s, type %s\n", toChars(), type.toChars());
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105
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106 if (e1.op == TOKsymoff)
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107 {
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108 SymOffExp se = cast(SymOffExp)e1;
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109 se.var.checkModify(loc, sc, type);
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110 //return toLvalue(sc, e);
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111 }
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112
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113 return Expression.modifiableLvalue(sc, e);
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114 }
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115 }
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72
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116 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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0
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117 {
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118 assert(false);
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119 }
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120
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72
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121 override elem* toElem(IRState* irs)
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0
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122 {
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123 elem* e;
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124
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125 //printf("PtrExp::toElem() %s\n", toChars());
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126 e = e1.toElem(irs);
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127 e = el_una(OPER.OPind, type.totym(), e);
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128
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129 if (tybasic(e.Ety) == TYM.TYstruct)
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130 {
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131 e.Enumbytes = cast(uint)type.size();
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132 }
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133
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134 el_setLoc(e,loc);
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135 return e;
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136 }
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137
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72
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138 override Expression optimize(int result)
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0
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139 {
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140 //printf("PtrExp.optimize(result = x%x) %s\n", result, toChars());
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141 e1 = e1.optimize(result);
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142 // Convert *&ex to ex
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143 if (e1.op == TOK.TOKaddress)
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144 {
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145 Expression e;
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146 Expression ex;
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147
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148 ex = (cast(AddrExp)e1).e1;
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149 if (type.equals(ex.type))
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150 e = ex;
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151 else
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152 {
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153 e = ex.copy();
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154 e.type = type;
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155 }
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156 return e;
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157 }
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158 // Constant fold *(&structliteral + offset)
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159 if (e1.op == TOK.TOKadd)
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160 {
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161 Expression e;
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162 e = Ptr(type, e1);
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163 if (e !is EXP_CANT_INTERPRET)
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164 return e;
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165 }
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166
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167 if (e1.op == TOK.TOKsymoff)
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168 {
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169 SymOffExp se = cast(SymOffExp)e1;
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170 VarDeclaration v = se.var.isVarDeclaration();
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171 Expression e = expandVar(result, v);
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172 if (e && e.op == TOK.TOKstructliteral)
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173 {
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174 StructLiteralExp sle = cast(StructLiteralExp)e;
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175 e = sle.getField(type, se.offset);
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176 if (e && e !is EXP_CANT_INTERPRET)
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177 return e;
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178 }
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179 }
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180 return this;
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181 }
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182
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72
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183 override Expression interpret(InterState istate)
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0
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184 {
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185 assert(false);
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186 }
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187
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72
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188 override Identifier opId()
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0
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189 {
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190 assert(false);
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191 }
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192 }
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193
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