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