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1 module dmd.ArrayScopeSymbol;
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2
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3 import dmd.ScopeDsymbol;
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4 import dmd.Expression;
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5 import dmd.TypeTuple;
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6 import dmd.TupleDeclaration;
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7 import dmd.Scope;
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8 import dmd.Dsymbol;
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9 import dmd.Loc;
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10 import dmd.TOK;
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11 import dmd.Identifier;
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12 import dmd.Id;
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13 import dmd.TY;
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14 import dmd.TupleExp;
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15 import dmd.StringExp;
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16 import dmd.WANT;
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17 import dmd.TypeExp;
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18 import dmd.Type;
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19 import dmd.SliceExp;
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20 import dmd.IndexExp;
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21 import dmd.IntegerExp;
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22 import dmd.STC;
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23 import dmd.ExpInitializer;
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24 import dmd.VarDeclaration;
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25 import dmd.ArrayLiteralExp;
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26 import dmd.expression.Util;
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27
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28 class ArrayScopeSymbol : ScopeDsymbol
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29 {
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30 Expression exp; // IndexExp or SliceExp
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31 TypeTuple type; // for tuple[length]
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32 TupleDeclaration td; // for tuples of objects
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33 Scope sc;
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34
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35 this(Scope sc, Expression e)
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36 {
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37 super();
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38 assert(e.op == TOKindex || e.op == TOKslice);
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39 this.exp = e;
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40 this.sc = sc;
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41 }
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42
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43 this(Scope sc, TypeTuple t)
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44 {
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45 assert(false);
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46 }
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47
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48 this(Scope sc, TupleDeclaration td)
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49 {
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50 assert(false);
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51 }
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52
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53 Dsymbol search(Loc loc, Identifier ident, int flags)
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54 {
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55 //printf("ArrayScopeSymbol.search('%s', flags = %d)\n", ident.toChars(), flags);
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56 if (ident == Id.length || ident == Id.dollar)
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57 {
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58 VarDeclaration* pvar;
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59 Expression ce;
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60
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61 L1:
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62 if (td)
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63 { /* $ gives the number of elements in the tuple
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64 */
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65 VarDeclaration v = new VarDeclaration(loc, Type.tsize_t, Id.dollar, null);
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66 Expression e = new IntegerExp(Loc(0), td.objects.dim, Type.tsize_t);
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67 v.init = new ExpInitializer(Loc(0), e);
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68 v.storage_class |= STCstatic | STCconst;
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69 v.semantic(sc);
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70 return v;
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71 }
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72
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73 if (type)
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74 { /* $ gives the number of type entries in the type tuple
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75 */
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76 VarDeclaration v = new VarDeclaration(loc, Type.tsize_t, Id.dollar, null);
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77 Expression e = new IntegerExp(Loc(0), type.arguments.dim, Type.tsize_t);
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78 v.init = new ExpInitializer(Loc(0), e);
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79 v.storage_class |= STCstatic | STCconst;
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80 v.semantic(sc);
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81 return v;
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82 }
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83
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84 if (exp.op == TOKindex)
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85 { /* array[index] where index is some function of $
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86 */
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87 IndexExp ie = cast(IndexExp)exp;
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88
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89 pvar = &ie.lengthVar;
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90 ce = ie.e1;
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91 }
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92 else if (exp.op == TOKslice)
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93 { /* array[lwr .. upr] where lwr or upr is some function of $
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94 */
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95 SliceExp se = cast(SliceExp)exp;
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96
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97 pvar = &se.lengthVar;
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98 ce = se.e1;
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99 }
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100 else
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101 /* Didn't find $, look in enclosing scope(s).
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102 */
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103 return null;
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104
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105 /* If we are indexing into an array that is really a type
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106 * tuple, rewrite this as an index into a type tuple and
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107 * try again.
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108 */
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109 if (ce.op == TOKtype)
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110 {
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111 Type t = (cast(TypeExp)ce).type;
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112 if (t.ty == Ttuple)
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113 {
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114 type = cast(TypeTuple)t;
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115 goto L1;
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116 }
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117 }
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118
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119 /* *pvar is lazily initialized, so if we refer to $
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120 * multiple times, it gets set only once.
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121 */
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122 if (!*pvar) // if not already initialized
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123 { /* Create variable v and set it to the value of $,
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124 * which will be a constant.
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125 */
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126 VarDeclaration v = new VarDeclaration(loc, Type.tsize_t, Id.dollar, null);
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127
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128 if (ce.op == TOKvar)
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129 { // if ce is const, get its initializer
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130 ce = fromConstInitializer(WANTvalue | WANTinterpret, ce);
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131 }
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132
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133 if (ce.op == TOKstring)
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134 { /* It is for a string literal, so the
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135 * length will be a const.
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136 */
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137 Expression e = new IntegerExp(Loc(0), (cast(StringExp)ce).len, Type.tsize_t);
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138 v.init = new ExpInitializer(Loc(0), e);
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139 v.storage_class |= STCstatic | STCconst;
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140 }
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141 else if (ce.op == TOKarrayliteral)
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142 { /* It is for an array literal, so the
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143 * length will be a const.
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144 */
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145 Expression e = new IntegerExp(Loc(0), (cast(ArrayLiteralExp)ce).elements.dim, Type.tsize_t);
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146 v.init = new ExpInitializer(Loc(0), e);
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147 v.storage_class |= STCstatic | STCconst;
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148 }
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149 else if (ce.op == TOKtuple)
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150 { /* It is for an expression tuple, so the
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151 * length will be a const.
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152 */
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153 Expression e = new IntegerExp(Loc(0), (cast(TupleExp)ce).exps.dim, Type.tsize_t);
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154 v.init = new ExpInitializer(Loc(0), e);
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155 v.storage_class |= STCstatic | STCconst;
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156 }
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157 *pvar = v;
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158 }
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159 (*pvar).semantic(sc);
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160 return (*pvar);
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161 }
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162 return null;
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163 }
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164
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165 ArrayScopeSymbol isArrayScopeSymbol() { return this; }
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166 } |
