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