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1 module dmd.CommaExp;
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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.Loc;
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5 import dmd.BinExp;
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6 import dmd.IRState;
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7 import dmd.Scope;
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8 import dmd.IntRange;
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9 import dmd.Expression;
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163
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10 import dmd.GlobalExpressions;
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11 import dmd.MATCH;
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12 import dmd.WANT;
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13 import dmd.TOK;
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14 import dmd.Type;
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15 import dmd.InterState;
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16
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17 import dmd.backend.elem;
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18 import dmd.backend.Util;
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19
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20 class CommaExp : BinExp
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21 {
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22 this(Loc loc, Expression e1, Expression e2)
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23 {
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178
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24 register();
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25
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26 super(loc, TOK.TOKcomma, CommaExp.sizeof, e1, e2);
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27 }
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28
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72
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29 override Expression semantic(Scope sc)
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30 {
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31 if (!type)
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32 {
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33 BinExp.semanticp(sc);
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34 type = e2.type;
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35 }
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36 return this;
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37 }
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38
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39 override void checkEscape()
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40 {
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41 e2.checkEscape();
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42 }
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43
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135
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44 override void checkEscapeRef()
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45 {
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46 e2.checkEscapeRef();
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47 }
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48
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49 override IntRange getIntRange()
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50 {
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51 assert(false);
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52 }
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53
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54 version (DMDV2) {
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72
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55 override int isLvalue()
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56 {
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57 return e2.isLvalue();
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58 }
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59 }
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72
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60 override Expression toLvalue(Scope sc, Expression e)
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61 {
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62 e2 = e2.toLvalue(sc, null);
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63 return this;
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64 }
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65
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66 override Expression modifiableLvalue(Scope sc, Expression e)
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67 {
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68 e2 = e2.modifiableLvalue(sc, e);
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69 return this;
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70 }
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71
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72
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72 override bool isBool(bool result)
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73 {
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74 return e2.isBool(result);
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75 }
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76
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77 override bool checkSideEffect(int flag)
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78 {
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79 if (flag == 2)
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80 return e1.checkSideEffect(2) || e2.checkSideEffect(2);
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81 else
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82 {
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83 // Don't check e1 until we cast(void) the a,b code generation
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84 return e2.checkSideEffect(flag);
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85 }
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86 }
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87
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88 override MATCH implicitConvTo(Type t)
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89 {
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90 return e2.implicitConvTo(t);
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91 }
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92
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93 override Expression castTo(Scope sc, Type t)
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94 {
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56
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95 Expression e2c = e2.castTo(sc, t);
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96 Expression e;
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97
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98 if (e2c != e2)
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99 {
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100 e = new CommaExp(loc, e1, e2c);
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101 e.type = e2c.type;
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102 }
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103 else
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104 {
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105 e = this;
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106 e.type = e2.type;
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107 }
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108 return e;
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109 }
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110
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72
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111 override Expression optimize(int result)
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112 {
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113 Expression e;
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114
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115 //printf("CommaExp.optimize(result = %d) %s\n", result, toChars());
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116 e1 = e1.optimize(result & WANTinterpret);
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117 e2 = e2.optimize(result);
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118 if (!e1 || e1.op == TOKint64 || e1.op == TOKfloat64 || !e1.checkSideEffect(2))
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119 {
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120 e = e2;
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121 if (e)
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122 e.type = type;
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123 }
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124 else
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125 e = this;
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126 //printf("-CommaExp.optimize(result = %d) %s\n", result, e.toChars());
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127 return e;
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128 }
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129
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72
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130 override Expression interpret(InterState istate)
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131 {
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163
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132 version (LOG) {
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133 printf("CommaExp.interpret() %.*s\n", toChars());
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134 }
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135 Expression e = e1.interpret(istate);
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136 if (e !is EXP_CANT_INTERPRET)
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137 e = e2.interpret(istate);
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138 return e;
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139 }
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140
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72
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141 override elem* toElem(IRState* irs)
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0
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142 {
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143 assert(e1 && e2);
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144 elem* eleft = e1.toElem(irs);
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145 elem* eright = e2.toElem(irs);
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146 elem* e = el_combine(eleft, eright);
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147 if (e)
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148 el_setLoc(e, loc);
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149 return e;
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150 }
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72
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151 }
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