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1 module dmd.ArrayScopeSymbol;
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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.ScopeDsymbol;
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5 import dmd.Expression;
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6 import dmd.TypeTuple;
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7 import dmd.TupleDeclaration;
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8 import dmd.Scope;
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9 import dmd.Dsymbol;
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10 import dmd.Loc;
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11 import dmd.TOK;
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12 import dmd.Identifier;
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13 import dmd.Id;
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14 import dmd.TY;
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15 import dmd.TupleExp;
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16 import dmd.StringExp;
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17 import dmd.WANT;
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18 import dmd.TypeExp;
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19 import dmd.Type;
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20 import dmd.SliceExp;
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21 import dmd.IndexExp;
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22 import dmd.IntegerExp;
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23 import dmd.STC;
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24 import dmd.ExpInitializer;
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25 import dmd.VarDeclaration;
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26 import dmd.ArrayLiteralExp;
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27 import dmd.expression.Util;
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28
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29 class ArrayScopeSymbol : ScopeDsymbol
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30 {
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31 Expression exp; // IndexExp or SliceExp
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32 TypeTuple type; // for tuple[length]
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33 TupleDeclaration td; // for tuples of objects
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34 Scope sc;
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35
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36 this(Scope sc, Expression e)
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37 {
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38 super();
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39 assert(e.op == TOKindex || e.op == TOKslice);
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40 this.exp = e;
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41 this.sc = sc;
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42 }
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43
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44 this(Scope sc, TypeTuple t)
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45 {
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49
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46 exp = null;
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47 type = t;
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48 td = null;
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49 this.sc = sc;
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50 }
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51
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38
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52 this(Scope sc, TupleDeclaration s)
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53 {
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38
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54 exp = null;
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55 type = null;
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56 td = s;
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57 this.sc = sc;
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58 }
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59
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72
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60 override Dsymbol search(Loc loc, Identifier ident, int flags)
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61 {
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62 //printf("ArrayScopeSymbol.search('%s', flags = %d)\n", ident.toChars(), flags);
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63 if (ident == Id.length || ident == Id.dollar)
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64 {
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65 VarDeclaration* pvar;
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66 Expression ce;
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67
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68 L1:
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69 if (td)
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70 { /* $ gives the number of elements in the tuple
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71 */
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72 VarDeclaration v = new VarDeclaration(loc, Type.tsize_t, Id.dollar, null);
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73 Expression e = new IntegerExp(Loc(0), td.objects.dim, Type.tsize_t);
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74 v.init = new ExpInitializer(Loc(0), e);
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75 v.storage_class |= STCstatic | STCconst;
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76 v.semantic(sc);
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77 return v;
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78 }
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79
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80 if (type)
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81 { /* $ gives the number of type entries in the type tuple
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82 */
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83 VarDeclaration v = new VarDeclaration(loc, Type.tsize_t, Id.dollar, null);
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84 Expression e = new IntegerExp(Loc(0), type.arguments.dim, Type.tsize_t);
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85 v.init = new ExpInitializer(Loc(0), e);
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86 v.storage_class |= STCstatic | STCconst;
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87 v.semantic(sc);
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88 return v;
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89 }
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90
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91 if (exp.op == TOKindex)
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92 { /* array[index] where index is some function of $
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93 */
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94 IndexExp ie = cast(IndexExp)exp;
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95
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96 pvar = &ie.lengthVar;
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97 ce = ie.e1;
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98 }
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99 else if (exp.op == TOKslice)
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100 { /* array[lwr .. upr] where lwr or upr is some function of $
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101 */
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102 SliceExp se = cast(SliceExp)exp;
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103
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104 pvar = &se.lengthVar;
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105 ce = se.e1;
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106 }
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107 else
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108 /* Didn't find $, look in enclosing scope(s).
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109 */
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110 return null;
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111
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112 /* If we are indexing into an array that is really a type
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113 * tuple, rewrite this as an index into a type tuple and
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114 * try again.
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115 */
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116 if (ce.op == TOKtype)
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117 {
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118 Type t = (cast(TypeExp)ce).type;
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119 if (t.ty == Ttuple)
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120 {
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121 type = cast(TypeTuple)t;
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122 goto L1;
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123 }
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124 }
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125
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126 /* *pvar is lazily initialized, so if we refer to $
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127 * multiple times, it gets set only once.
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128 */
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129 if (!*pvar) // if not already initialized
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130 { /* Create variable v and set it to the value of $,
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131 * which will be a constant.
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132 */
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133 VarDeclaration v = new VarDeclaration(loc, Type.tsize_t, Id.dollar, null);
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134
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135 if (ce.op == TOKvar)
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136 { // if ce is const, get its initializer
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137 ce = fromConstInitializer(WANTvalue | WANTinterpret, ce);
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138 }
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139
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140 if (ce.op == TOKstring)
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141 { /* It is for a string literal, so the
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142 * length will be a const.
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143 */
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144 Expression e = new IntegerExp(Loc(0), (cast(StringExp)ce).len, Type.tsize_t);
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145 v.init = new ExpInitializer(Loc(0), e);
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146 v.storage_class |= STCstatic | STCconst;
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147 }
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148 else if (ce.op == TOKarrayliteral)
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149 { /* It is for an array literal, so the
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150 * length will be a const.
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151 */
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152 Expression e = new IntegerExp(Loc(0), (cast(ArrayLiteralExp)ce).elements.dim, Type.tsize_t);
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153 v.init = new ExpInitializer(Loc(0), e);
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154 v.storage_class |= STCstatic | STCconst;
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155 }
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156 else if (ce.op == TOKtuple)
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157 { /* It is for an expression tuple, so the
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158 * length will be a const.
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159 */
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160 Expression e = new IntegerExp(Loc(0), (cast(TupleExp)ce).exps.dim, Type.tsize_t);
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161 v.init = new ExpInitializer(Loc(0), e);
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162 v.storage_class |= STCstatic | STCconst;
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163 }
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164 *pvar = v;
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165 }
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166 (*pvar).semantic(sc);
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167 return (*pvar);
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168 }
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169 return null;
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170 }
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171
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172 override ArrayScopeSymbol isArrayScopeSymbol() { return this; }
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173 }
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