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1 module dmd.CondExp;
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2
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114
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3 import dmd.common;
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0
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4 import dmd.BinExp;
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5 import dmd.Loc;
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123
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6 import dmd.PtrExp;
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0
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7 import dmd.MATCH;
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8 import dmd.Expression;
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9 import dmd.Scope;
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10 import dmd.InterState;
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11 import dmd.OutBuffer;
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12 import dmd.HdrGenState;
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13 import dmd.Type;
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14 import dmd.InlineCostState;
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15 import dmd.InlineDoState;
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16 import dmd.InlineScanState;
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17 import dmd.IRState;
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18 import dmd.TOK;
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19 import dmd.TY;
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20 import dmd.WANT;
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50
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21 import dmd.PREC;
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0
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22 import dmd.Global;
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23
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24 import dmd.backend.elem;
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25 import dmd.backend.Util;
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26 import dmd.backend.OPER;
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27 import dmd.backend.mTY;
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28 import dmd.backend.TYM;
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29 import dmd.codegen.Util;
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30
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50
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31 import dmd.expression.Util;
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32
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0
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33 class CondExp : BinExp
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34 {
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35 Expression econd;
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36
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37 this(Loc loc, Expression econd, Expression e1, Expression e2)
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38 {
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39 super(loc, TOK.TOKquestion, CondExp.sizeof, e1, e2);
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40 this.econd = econd;
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41 }
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42
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72
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43 override Expression syntaxCopy()
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44 {
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43
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45 return new CondExp(loc, econd.syntaxCopy(), e1.syntaxCopy(), e2.syntaxCopy());
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46 }
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47
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72
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48 override Expression semantic(Scope sc)
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49 {
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50 Type t1;
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51 Type t2;
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52 uint cs0;
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53 uint cs1;
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54
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55 version (LOGSEMANTIC) {
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56 printf("CondExp.semantic('%s')\n", toChars());
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57 }
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58 if (type)
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59 return this;
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60
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61 econd = econd.semantic(sc);
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62 econd = resolveProperties(sc, econd);
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63 econd = econd.checkToPointer();
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64 econd = econd.checkToBoolean();
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65
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66 static if (false) {
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67 /* this cannot work right because the types of e1 and e2
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68 * both contribute to the type of the result.
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69 */
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70 if (sc.flags & SCOPEstaticif)
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71 {
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72 /* If in static if, don't evaluate what we don't have to.
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73 */
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74 econd = econd.optimize(WANTflags);
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75 if (econd.isBool(TRUE))
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76 {
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77 e1 = e1.semantic(sc);
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78 e1 = resolveProperties(sc, e1);
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79 return e1;
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80 }
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81 else if (econd.isBool(FALSE))
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82 {
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83 e2 = e2.semantic(sc);
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84 e2 = resolveProperties(sc, e2);
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85 return e2;
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86 }
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87 }
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88 }
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89
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90 cs0 = sc.callSuper;
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91 e1 = e1.semantic(sc);
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92 e1 = resolveProperties(sc, e1);
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93 cs1 = sc.callSuper;
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94 sc.callSuper = cs0;
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95 e2 = e2.semantic(sc);
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96 e2 = resolveProperties(sc, e2);
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97 sc.mergeCallSuper(loc, cs1);
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98
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99 // If either operand is void, the result is void
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100 t1 = e1.type;
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101 t2 = e2.type;
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102 if (t1.ty == Tvoid || t2.ty == Tvoid)
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103 type = Type.tvoid;
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104 else if (t1 == t2)
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105 type = t1;
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106 else
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107 {
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108 typeCombine(sc);
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109 switch (e1.type.toBasetype().ty)
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110 {
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111 case Tcomplex32:
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112 case Tcomplex64:
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113 case Tcomplex80:
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114 e2 = e2.castTo(sc, e1.type);
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115 break;
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116 default:
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117 break;
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118 }
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119 switch (e2.type.toBasetype().ty)
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120 {
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121 case Tcomplex32:
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122 case Tcomplex64:
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123 case Tcomplex80:
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124 e1 = e1.castTo(sc, e2.type);
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125 break;
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126 default:
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127 break;
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128 }
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129 if (type.toBasetype().ty == Tarray)
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130 {
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131 e1 = e1.castTo(sc, type);
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132 e2 = e2.castTo(sc, type);
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133 }
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134 }
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135 static if (false) {
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136 printf("res: %s\n", type.toChars());
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137 printf("e1 : %s\n", e1.type.toChars());
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138 printf("e2 : %s\n", e2.type.toChars());
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139 }
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140 return this;
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141 }
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142
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72
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143 override Expression optimize(int result)
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144 {
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145 Expression e;
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146
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147 econd = econd.optimize(WANTflags | (result & WANTinterpret));
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148 if (econd.isBool(true))
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149 e = e1.optimize(result);
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150 else if (econd.isBool(false))
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151 e = e2.optimize(result);
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152 else
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153 {
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154 e1 = e1.optimize(result);
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155 e2 = e2.optimize(result);
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156 e = this;
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157 }
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158
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159 return e;
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160 }
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161
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162 override Expression interpret(InterState istate)
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163 {
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164 assert(false);
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165 }
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166
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167 override void checkEscape()
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168 {
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169 e1.checkEscape();
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170 e2.checkEscape();
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171 }
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172
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173 override int isLvalue()
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174 {
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175 return e1.isLvalue() && e2.isLvalue();
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176 }
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177
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178 override Expression toLvalue(Scope sc, Expression ex)
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179 {
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180 PtrExp e;
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181
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182 // convert (econd ? e1 : e2) to *(econd ? &e1 : &e2)
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183 e = new PtrExp(loc, this, type);
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184
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185 e1 = e1.addressOf(sc);
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186 //e1 = e1.toLvalue(sc, null);
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187
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188 e2 = e2.addressOf(sc);
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189 //e2 = e2.toLvalue(sc, null);
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190
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191 typeCombine(sc);
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192
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193 type = e2.type;
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194 return e;
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195 }
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196
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197 override Expression modifiableLvalue(Scope sc, Expression e)
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198 {
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199 error("conditional expression %s is not a modifiable lvalue", toChars());
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200 return this;
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201 }
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202
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203 override Expression checkToBoolean()
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204 {
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205 e1 = e1.checkToBoolean();
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206 e2 = e2.checkToBoolean();
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207 return this;
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208 }
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209
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210 override bool checkSideEffect(int flag)
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211 {
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212 if (flag == 2)
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213 {
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214 return econd.checkSideEffect(2) || e1.checkSideEffect(2) || e2.checkSideEffect(2);
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215 }
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216 else
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217 {
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218 econd.checkSideEffect(1);
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219 e1.checkSideEffect(flag);
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220 return e2.checkSideEffect(flag);
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221 }
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222 }
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223
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224 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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225 {
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226 expToCBuffer(buf, hgs, econd, PREC_oror);
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227 buf.writestring(" ? ");
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228 expToCBuffer(buf, hgs, e1, PREC_expr);
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229 buf.writestring(" : ");
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230 expToCBuffer(buf, hgs, e2, PREC_cond);
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231 }
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232
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233 override MATCH implicitConvTo(Type t)
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234 {
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235 MATCH m1 = e1.implicitConvTo(t);
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236 MATCH m2 = e2.implicitConvTo(t);
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237 //printf("CondExp: m1 %d m2 %d\n", m1, m2);
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238
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239 // Pick the worst match
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240 return (m1 < m2) ? m1 : m2;
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241 }
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242
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243 override Expression castTo(Scope sc, Type t)
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244 {
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245 Expression e = this;
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246
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247 if (type !is t)
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248 {
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249 if (1 || e1.op == TOKstring || e2.op == TOKstring)
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250 {
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251 e = new CondExp(loc, econd, e1.castTo(sc, t), e2.castTo(sc, t));
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252 e.type = t;
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253 }
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254 else
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255 e = Expression.castTo(sc, t);
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256 }
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257 return e;
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258 }
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259
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260 override void scanForNestedRef(Scope sc)
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261 {
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262 assert(false);
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263 }
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264
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265 override bool canThrow()
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266 {
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267 return econd.canThrow() || e1.canThrow() || e2.canThrow();
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268 }
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269
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270 override int inlineCost(InlineCostState* ics)
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271 {
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272 return 1 + e1.inlineCost(ics) + e2.inlineCost(ics) + econd.inlineCost(ics);
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273 }
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274
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275 override Expression doInline(InlineDoState ids)
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276 {
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277 CondExp ce = cast(CondExp)copy();
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278
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279 ce.econd = econd.doInline(ids);
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280 ce.e1 = e1.doInline(ids);
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281 ce.e2 = e2.doInline(ids);
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282 return ce;
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283 }
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284
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285 override Expression inlineScan(InlineScanState* iss)
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286 {
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287 econd = econd.inlineScan(iss);
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288 e1 = e1.inlineScan(iss);
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289 e2 = e2.inlineScan(iss);
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290 return this;
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291 }
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292
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293 override elem* toElem(IRState* irs)
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294 {
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295 elem* eleft;
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296 elem* eright;
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297
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298 elem* ec = econd.toElem(irs);
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299
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300 eleft = e1.toElem(irs);
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301 tym_t ty = eleft.Ety;
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302 if (global.params.cov && e1.loc.linnum)
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303 eleft = el_combine(incUsageElem(irs, e1.loc), eleft);
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304
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305 eright = e2.toElem(irs);
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306 if (global.params.cov && e2.loc.linnum)
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307 eright = el_combine(incUsageElem(irs, e2.loc), eright);
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308
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309 elem* e = el_bin(OPcond, ty, ec, el_bin(OPcolon, ty, eleft, eright));
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310 if (tybasic(ty) == TYstruct)
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311 e.Enumbytes = cast(uint)e1.type.size();
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312
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313 el_setLoc(e, loc);
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314 return e;
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315 }
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72
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316 }
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