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1 module dmd.UnaExp;
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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.TY;
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6 import dmd.TypeClass;
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7 import dmd.TypeStruct;
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8 import dmd.Dsymbol;
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9 import dmd.AggregateDeclaration;
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10 import dmd.Type;
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11 import dmd.OutBuffer;
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12 import dmd.Loc;
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13 import dmd.TOK;
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14 import dmd.Scope;
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15 import dmd.InlineCostState;
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16 import dmd.InlineDoState;
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17 import dmd.HdrGenState;
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18 import dmd.InlineScanState;
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19 import dmd.DotIdExp;
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20 import dmd.ArrayExp;
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21 import dmd.CallExp;
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22 import dmd.PREC;
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23 import dmd.Token;
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24 import dmd.expression.Util;
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25
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26 class UnaExp : Expression
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27 {
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28 Expression e1;
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29
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30 this(Loc loc, TOK op, int size, Expression e1)
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31 {
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32 super(loc, op, size);
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33 this.e1 = e1;
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34 }
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35
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36 Expression syntaxCopy()
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37 {
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38 UnaExp e = cast(UnaExp)copy();
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39 e.type = null;
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40 e.e1 = e.e1.syntaxCopy();
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41
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42 return e;
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43 }
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44
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45 Expression semantic(Scope sc)
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46 {
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47 version (LOGSEMANTIC) {
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48 writef("UnaExp.semantic('%s')\n", toChars());
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49 }
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50 e1 = e1.semantic(sc);
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51 // if (!e1.type)
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52 // error("%s has no value", e1.toChars());
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53 return this;
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54 }
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55
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56 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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57 {
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58 buf.writestring(Token.toChars(op));
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59 expToCBuffer(buf, hgs, e1, precedence[op]);
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60 }
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61
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62 Expression optimize(int result)
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63 {
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64 e1 = e1.optimize(result);
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65 return this;
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66 }
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67
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68 void dump(int indent)
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69 {
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70 assert(false);
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71 }
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72
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73 void scanForNestedRef(Scope sc)
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74 {
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75 e1.scanForNestedRef(sc);
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76 }
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77
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78 Expression interpretCommon(InterState istate, Expression *(*fp)(Type* a0, Expression* a1))
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79 {
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80 assert(false);
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81 }
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82
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83 bool canThrow()
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84 {
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85 return e1.canThrow();
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86 }
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87
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88 int inlineCost(InlineCostState* ics)
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89 {
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90 return 1 + e1.inlineCost(ics);
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91 }
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92
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93 Expression doInline(InlineDoState ids)
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94 {
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95 UnaExp ue = cast(UnaExp)copy();
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96
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97 ue.e1 = e1.doInline(ids);
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98 return ue;
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99 }
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100
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101 Expression inlineScan(InlineScanState* iss)
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102 {
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103 e1 = e1.inlineScan(iss);
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104 return this;
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105 }
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106
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107 /************************************
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108 * Operator overload.
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109 * Check for operator overload, if so, replace
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110 * with function call.
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111 * Return null if not an operator overload.
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112 */
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113 Expression op_overload(Scope sc)
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114 {
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115 //printf("UnaExp.op_overload() (%s)\n", toChars());
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116 AggregateDeclaration ad;
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117 Dsymbol fd;
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118 Type t1 = e1.type.toBasetype();
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119
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120 if (t1.ty == TY.Tclass)
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121 {
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122 ad = (cast(TypeClass)t1).sym;
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123 goto L1;
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124 }
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125 else if (t1.ty == TY.Tstruct)
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126 {
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127 ad = (cast(TypeStruct)t1).sym;
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128
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129 L1:
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130 fd = search_function(ad, opId());
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131 if (fd)
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132 {
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133 if (op == TOK.TOKarray)
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134 {
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135 /* Rewrite op e1[arguments] as:
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136 * e1.fd(arguments)
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137 */
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138 Expression e = new DotIdExp(loc, e1, fd.ident);
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139 ArrayExp ae = cast(ArrayExp)this;
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140 e = new CallExp(loc, e, ae.arguments);
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141 e = e.semantic(sc);
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142 return e;
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143 }
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144 else
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145 {
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146 // Rewrite +e1 as e1.add()
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147 return build_overload(loc, sc, e1, null, fd.ident);
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148 }
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149 }
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150
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151 version (DMDV2) {
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152 // Didn't find it. Forward to aliasthis
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153 if (ad.aliasthis)
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154 {
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155 /* Rewrite op(e1) as:
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156 * op(e1.aliasthis)
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157 */
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158 Expression e1 = new DotIdExp(loc, this.e1, ad.aliasthis.ident);
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159 Expression e = copy();
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160 (cast(UnaExp)e).e1 = e1;
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161 e = e.semantic(sc);
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162 return e;
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163 }
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164 }
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165 }
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166 return null;
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167 }
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168 }
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169
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