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annotate dmd/MinExp.d @ 182:b64060ab22df

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Now compileable with dmd2.050
author korDen
date Sat, 30 Oct 2010 05:05:32 +0400
parents e3afd1303184
children b0d41ff5e0df
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1 module dmd.MinExp;
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2
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3 import dmd.common;
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4 import dmd.Expression;
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5 import dmd.TY;
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6 import dmd.ErrorExp;
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7 import dmd.Identifier;
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8 import dmd.IntegerExp;
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9 import dmd.DivExp;
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10 import dmd.Type;
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11 import dmd.InterState;
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12 import dmd.OutBuffer;
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13 import dmd.Loc;
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14 import dmd.Scope;
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15 import dmd.IRState;
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16 import dmd.ArrayTypes;
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17 import dmd.BinExp;
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18 import dmd.TOK;
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19 import dmd.Id;
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20 import dmd.expression.Min;
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21
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22 import dmd.backend.elem;
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23 import dmd.backend.Util;
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24 import dmd.backend.OPER;
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25
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26 class MinExp : BinExp
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27 {
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28 this(Loc loc, Expression e1, Expression e2)
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29 {
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30 register();
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31 super(loc, TOK.TOKmin, MinExp.sizeof, e1, e2);
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32 }
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33
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34 override Expression semantic(Scope sc)
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35 {
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36 Expression e;
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37 Type t1;
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38 Type t2;
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39
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40 version (LOGSEMANTIC) {
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41 printf("MinExp.semantic('%s')\n", toChars());
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42 }
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43 if (type)
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44 return this;
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45
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46 super.semanticp(sc);
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47
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48 e = op_overload(sc);
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49 if (e)
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50 return e;
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51
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52 e = this;
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53 t1 = e1.type.toBasetype();
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54 t2 = e2.type.toBasetype();
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55 if (t1.ty == TY.Tpointer)
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56 {
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57 if (t2.ty == TY.Tpointer)
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58 { // Need to divide the result by the stride
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59 // Replace (ptr - ptr) with (ptr - ptr) / stride
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60 long stride;
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61 Expression ee;
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62
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63 typeCombine(sc); // make sure pointer types are compatible
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64 type = Type.tptrdiff_t;
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65 stride = t2.nextOf().size();
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66 if (stride == 0)
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67 {
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68 ee = new IntegerExp(loc, 0, Type.tptrdiff_t);
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69 }
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70 else
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71 {
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72 ee = new DivExp(loc, this, new IntegerExp(Loc(0), stride, Type.tptrdiff_t));
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73 ee.type = Type.tptrdiff_t;
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74 }
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75 return ee;
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76 }
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77 else if (t2.isintegral())
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78 e = scaleFactor(sc);
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79 else
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80 {
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81 error("incompatible types for minus");
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82 return new ErrorExp();
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83 }
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84 }
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85 else if (t2.ty == TY.Tpointer)
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86 {
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87 type = e2.type;
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88 error("can't subtract pointer from %s", e1.type.toChars());
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89 return new ErrorExp();
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90 }
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91 else
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92 {
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93 typeCombine(sc);
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94 t1 = e1.type.toBasetype();
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95 t2 = e2.type.toBasetype();
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96 if ((t1.isreal() && t2.isimaginary()) ||
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97 (t1.isimaginary() && t2.isreal()))
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98 {
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99 switch (type.ty)
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100 {
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101 case TY.Tfloat32:
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102 case TY.Timaginary32:
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103 type = Type.tcomplex32;
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104 break;
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105
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106 case TY.Tfloat64:
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107 case TY.Timaginary64:
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108 type = Type.tcomplex64;
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109 break;
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110
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111 case TY.Tfloat80:
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112 case TY.Timaginary80:
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113 type = Type.tcomplex80;
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114 break;
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115
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116 default:
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117 assert(0);
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118 }
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119 }
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120 }
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121 return e;
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122 }
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123
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124 override Expression optimize(int result)
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125 {
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126 Expression e;
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127
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128 e1 = e1.optimize(result);
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129 e2 = e2.optimize(result);
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130 if (e1.isConst() && e2.isConst())
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131 {
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132 if (e2.op == TOK.TOKsymoff)
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133 return this;
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134 e = Min(type, e1, e2);
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135 }
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136 else
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137 e = this;
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138
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139 return e;
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140 }
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141
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142 override Expression interpret(InterState istate)
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143 {
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144 return interpretCommon(istate, &Min);
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145 }
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146
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147 override void buildArrayIdent(OutBuffer buf, Expressions arguments)
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148 {
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149 Exp_buildArrayIdent(buf, arguments, "Min");
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150 }
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151
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152 override Expression buildArrayLoop(Parameters fparams)
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153 {
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154 return Exp_buildArrayLoop!(typeof(this))(fparams);
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155 }
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156
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157 override Identifier opId()
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158 {
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159 return Id.sub;
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160 }
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161
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162 override Identifier opId_r()
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163 {
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164 return Id.sub_r;
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165 }
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166
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167 override elem* toElem(IRState* irs)
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168 {
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169 Type tb1 = e1.type.toBasetype();
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170 Type tb2 = e2.type.toBasetype();
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171
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172 if ((tb1.ty == TY.Tarray || tb1.ty == TY.Tsarray) && (tb2.ty == TY.Tarray || tb2.ty == TY.Tsarray))
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173 {
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174 error("Array operation %s not implemented", toChars());
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175 return el_long(type.totym(), 0); // error recovery
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176 }
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177
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178 return toElemBin(irs, OPER.OPmin);
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179 }
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180 }
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