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