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1 module dmd.AndAndExp;
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2
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3 import dmd.Expression;
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4 import dmd.InterState;
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5 import dmd.Loc;
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6 import dmd.Scope;
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7 import dmd.IRState;
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8 import dmd.CommaExp;
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9 import dmd.Global;
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10 import dmd.BoolExp;
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11 import dmd.BinExp;
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12 import dmd.TOK;
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13 import dmd.WANT;
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14 import dmd.IntegerExp;
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15 import dmd.Type;
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16 import dmd.TY;
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17
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18 import dmd.backend.elem;
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19 import dmd.backend.OPER;
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20 import dmd.backend.Util;
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21
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22 class AndAndExp : BinExp
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23 {
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24 this(Loc loc, Expression e1, Expression e2)
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25 {
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26 super(loc, TOK.TOKandand, AndAndExp.sizeof, e1, e2);
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27 }
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28
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29 Expression semantic(Scope sc)
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30 {
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31 uint cs1;
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32
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33 // same as for OrOr
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34 e1 = e1.semantic(sc);
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35 e1 = resolveProperties(sc, e1);
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36 e1 = e1.checkToPointer();
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37 e1 = e1.checkToBoolean();
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38 cs1 = sc.callSuper;
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39
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40 if (sc.flags & SCOPE.SCOPEstaticif)
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41 {
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42 /* If in static if, don't evaluate e2 if we don't have to.
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43 */
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44 e1 = e1.optimize(WANTflags);
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45 if (e1.isBool(false))
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46 {
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47 return new IntegerExp(loc, 0, Type.tboolean);
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48 }
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49 }
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50
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51 e2 = e2.semantic(sc);
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52 sc.mergeCallSuper(loc, cs1);
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53 e2 = resolveProperties(sc, e2);
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54 e2 = e2.checkToPointer();
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55
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56 type = Type.tboolean;
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57 if (e2.type.ty == Tvoid)
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58 type = Type.tvoid;
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59 if (e2.op == TOKtype || e2.op == TOKimport)
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60 error("%s is not an expression", e2.toChars());
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61 return this;
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62 }
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63
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64 Expression checkToBoolean()
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65 {
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66 e2 = e2.checkToBoolean();
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67 return this;
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68 }
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69
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70 int isBit()
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71 {
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72 assert(false);
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73 }
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74
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75 Expression optimize(int result)
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76 {
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77 //printf("AndAndExp::optimize(%d) %s\n", result, toChars());
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78 e1 = e1.optimize(WANTflags | (result & WANTinterpret));
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79 Expression e = this;
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80 if (e1.isBool(false))
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81 {
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82 e = new CommaExp(loc, e1, new IntegerExp(loc, 0, type));
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83 e.type = type;
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84 e = e.optimize(result);
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85 }
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86 else
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87 {
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88 e2 = e2.optimize(WANTflags | (result & WANTinterpret));
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89 if (result && e2.type.toBasetype().ty == Tvoid && !global.errors)
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90 error("void has no value");
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91
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92 if (e1.isConst())
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93 {
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94 if (e2.isConst())
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95 {
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96 int n1 = e1.isBool(1);
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97 int n2 = e2.isBool(1);
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98
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99 e = new IntegerExp(loc, n1 && n2, type);
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100 }
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101 else if (e1.isBool(true))
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102 e = new BoolExp(loc, e2, type);
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103 }
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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 Expression interpret(InterState* istate)
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109 {
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110 assert(false);
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111 }
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112
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113 bool checkSideEffect(int flag)
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114 {
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115 assert(false);
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116 }
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117
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118 elem* toElem(IRState* irs)
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119 {
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120 elem* e = toElemBin(irs, OPandand);
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121 if (global.params.cov && e2.loc.linnum)
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122 e.E2() = el_combine(incUsageElem(irs, e2.loc), e.E2);
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123 return e;
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124 }
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125 }
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126
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