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annotate dmd/MinExp.d @ 130:60bb0fe4563e

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dmdfe 2.037 first main iteration
author Eldar Insafutdinov <e.insafutdinov@gmail.com>
date Thu, 09 Sep 2010 22:51:44 +0100
parents 9e39c7de8438
children e3afd1303184
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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 super(loc, TOK.TOKmin, MinExp.sizeof, e1, e2);
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31 }
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32
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33 override Expression semantic(Scope sc)
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34 {
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35 Expression e;
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36 Type t1;
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37 Type t2;
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38
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39 version (LOGSEMANTIC) {
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40 printf("MinExp.semantic('%s')\n", toChars());
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41 }
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42 if (type)
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43 return this;
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44
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45 super.semanticp(sc);
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46
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47 e = op_overload(sc);
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48 if (e)
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49 return e;
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50
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51 e = this;
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52 t1 = e1.type.toBasetype();
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53 t2 = e2.type.toBasetype();
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54 if (t1.ty == TY.Tpointer)
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55 {
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56 if (t2.ty == TY.Tpointer)
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57 { // Need to divide the result by the stride
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58 // Replace (ptr - ptr) with (ptr - ptr) / stride
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59 long stride;
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60 Expression ee;
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61
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62 typeCombine(sc); // make sure pointer types are compatible
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63 type = Type.tptrdiff_t;
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64 stride = t2.nextOf().size();
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65 if (stride == 0)
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66 {
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67 ee = new IntegerExp(loc, 0, Type.tptrdiff_t);
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68 }
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69 else
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70 {
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71 ee = new DivExp(loc, this, new IntegerExp(Loc(0), stride, Type.tptrdiff_t));
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72 ee.type = Type.tptrdiff_t;
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73 }
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74 return ee;
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75 }
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76 else if (t2.isintegral())
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77 e = scaleFactor(sc);
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78 else
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79 {
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80 error("incompatible types for minus");
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81 return new ErrorExp();
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82 }
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83 }
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84 else if (t2.ty == TY.Tpointer)
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85 {
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86 type = e2.type;
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87 error("can't subtract pointer from %s", e1.type.toChars());
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88 return new ErrorExp();
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89 }
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90 else
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91 {
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92 typeCombine(sc);
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93 t1 = e1.type.toBasetype();
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94 t2 = e2.type.toBasetype();
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95 if ((t1.isreal() && t2.isimaginary()) ||
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96 (t1.isimaginary() && t2.isreal()))
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97 {
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98 switch (type.ty)
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99 {
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100 case TY.Tfloat32:
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101 case TY.Timaginary32:
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102 type = Type.tcomplex32;
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103 break;
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104
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105 case TY.Tfloat64:
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106 case TY.Timaginary64:
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107 type = Type.tcomplex64;
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108 break;
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109
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110 case TY.Tfloat80:
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111 case TY.Timaginary80:
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112 type = Type.tcomplex80;
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113 break;
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114
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115 default:
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116 assert(0);
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117 }
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118 }
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119 }
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120 return e;
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121 }
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122
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123 override Expression optimize(int result)
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124 {
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125 Expression e;
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126
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127 e1 = e1.optimize(result);
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128 e2 = e2.optimize(result);
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129 if (e1.isConst() && e2.isConst())
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130 {
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131 if (e2.op == TOK.TOKsymoff)
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132 return this;
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133 e = Min(type, e1, e2);
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134 }
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135 else
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136 e = this;
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137
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138 return e;
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139 }
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140
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141 override Expression interpret(InterState istate)
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142 {
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143 return interpretCommon(istate, &Min);
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144 }
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145
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146 override void buildArrayIdent(OutBuffer buf, Expressions arguments)
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147 {
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148 Exp_buildArrayIdent(buf, arguments, "Min");
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149 }
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150
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151 override Expression buildArrayLoop(Parameters fparams)
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152 {
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153 return Exp_buildArrayLoop!(typeof(this))(fparams);
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154 }
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155
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156 override Identifier opId()
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157 {
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158 return Id.sub;
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159 }
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160
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161 override Identifier opId_r()
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162 {
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163 return Id.sub_r;
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164 }
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165
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166 override elem* toElem(IRState* irs)
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167 {
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168 Type tb1 = e1.type.toBasetype();
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169 Type tb2 = e2.type.toBasetype();
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170
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171 if ((tb1.ty == TY.Tarray || tb1.ty == TY.Tsarray) && (tb2.ty == TY.Tarray || tb2.ty == TY.Tsarray))
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172 {
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173 error("Array operation %s not implemented", toChars());
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174 return el_long(type.totym(), 0); // error recovery
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175 }
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176
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177 return toElemBin(irs, OPER.OPmin);
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178 }
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179 }
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