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