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