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annotate dmd/TypeSlice.d @ 187:b0d41ff5e0df

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Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
author Abscissa
date Tue, 07 Jun 2011 23:37:34 -0400
parents e3afd1303184
children
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1 module dmd.TypeSlice;
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2
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3 import dmd.common;
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4 import dmd.Type;
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5 import dmd.TypeNext;
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6 import dmd.MOD;
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7 import dmd.Expression;
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8 import dmd.Loc;
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9 import dmd.Scope;
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10 import dmd.Dsymbol;
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11 import dmd.OutBuffer;
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12 import dmd.HdrGenState;
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13 import dmd.TY;
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14 import dmd.TypeTuple;
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15 import dmd.WANT;
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16 import dmd.ArrayTypes;
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17 import dmd.Parameter;
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18 import dmd.SliceExp;
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19 import dmd.TupleDeclaration;
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20 import dmd.ScopeDsymbol;
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21 import dmd.ArrayScopeSymbol;
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22
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23 import dmd.type.Util;
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24
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25 import dmd.DDMDExtensions;
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26
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27 class TypeSlice : TypeNext
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28 {
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29 mixin insertMemberExtension!(typeof(this));
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30
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31 Expression lwr;
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32 Expression upr;
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33
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34 this(Type next, Expression lwr, Expression upr)
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35 {
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36 register();
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37 super(TY.Tslice, next);
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38 //printf("TypeSlice[%s .. %s]\n", lwr.toChars(), upr.toChars());
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39 this.lwr = lwr;
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40 this.upr = upr;
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41 }
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42
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43 override Type syntaxCopy()
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44 {
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45 Type t = new TypeSlice(next.syntaxCopy(), lwr.syntaxCopy(), upr.syntaxCopy());
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46 t.mod = mod;
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47 return t;
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48 }
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49
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50 override Type semantic(Loc loc, Scope sc)
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51 {
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52 //printf("TypeSlice.semantic() %s\n", toChars());
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53 next = next.semantic(loc, sc);
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54 transitive();
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55 //printf("next: %s\n", next.toChars());
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56
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57 Type tbn = next.toBasetype();
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58 if (tbn.ty != Ttuple)
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59 {
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60 error(loc, "can only slice tuple types, not %s", tbn.toChars());
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61 return Type.terror;
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62 }
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63 TypeTuple tt = cast(TypeTuple)tbn;
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64
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65 lwr = semanticLength(sc, tbn, lwr);
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66 lwr = lwr.optimize(WANTvalue);
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67 ulong i1 = lwr.toUInteger();
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68
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69 upr = semanticLength(sc, tbn, upr);
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70 upr = upr.optimize(WANTvalue);
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71 ulong i2 = upr.toUInteger();
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72
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73 if (!(i1 <= i2 && i2 <= tt.arguments.dim))
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74 {
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75 error(loc, "slice [%ju..%ju] is out of range of [0..%u]", i1, i2, tt.arguments.dim);
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76 return Type.terror;
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77 }
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78
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79 auto args = new Parameters;
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80 args.reserve(cast(size_t)(i2 - i1));
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81 for (size_t i = cast(size_t)i1; i < cast(size_t)i2; i++)
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82 {
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83 auto arg = tt.arguments[i];
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84 args.push(arg);
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85 }
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86
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87 return new TypeTuple(args);
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88 }
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89
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90 override void resolve(Loc loc, Scope sc, Expression* pe, Type* pt, Dsymbol* ps)
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91 {
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92 next.resolve(loc, sc, pe, pt, ps);
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93 if (*pe)
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94 { // It's really a slice expression
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95 Expression e;
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96 e = new SliceExp(loc, *pe, lwr, upr);
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97 *pe = e;
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98 }
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99 else if (*ps)
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100 {
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101 Dsymbol s = *ps;
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102 TupleDeclaration td = s.isTupleDeclaration();
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103 if (td)
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104 {
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105 /* It's a slice of a TupleDeclaration
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106 */
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107 ScopeDsymbol sym = new ArrayScopeSymbol(sc, td);
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108 sym.parent = sc.scopesym;
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109 sc = sc.push(sym);
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110
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111 lwr = lwr.semantic(sc);
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112 lwr = lwr.optimize(WANTvalue);
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113 ulong i1 = lwr.toUInteger();
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114
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115 upr = upr.semantic(sc);
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116 upr = upr.optimize(WANTvalue);
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117 ulong i2 = upr.toUInteger();
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118
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119 sc = sc.pop();
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120
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121 if (!(i1 <= i2 && i2 <= td.objects.dim))
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122 {
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123 error(loc, "slice [%ju..%ju] is out of range of [0..%u]", i1, i2, td.objects.dim);
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124 goto Ldefault;
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125 }
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126
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127 if (i1 == 0 && i2 == td.objects.dim)
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128 {
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129 *ps = td;
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130 return;
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131 }
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132
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133 /* Create a new TupleDeclaration which
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134 * is a slice [i1..i2] out of the old one.
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135 */
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136 auto objects = new Objects;
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137 objects.setDim(cast(uint)(i2 - i1));
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138 for (size_t i = 0; i < objects.dim; i++)
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139 {
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140 objects[i] = td.objects[cast(size_t)i1 + i];
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141 }
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142
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143 auto tds = new TupleDeclaration(loc, td.ident, objects);
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144 *ps = tds;
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145 }
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146 else
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147 goto Ldefault;
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148 }
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149 else
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150 {
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151 Ldefault:
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152 Type.resolve(loc, sc, pe, pt, ps);
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153 }
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154 }
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155
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156 override void toCBuffer2(OutBuffer buf, HdrGenState* hgs, MOD mod)
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157 {
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158 assert(false);
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159 }
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160 }