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