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annotate dmd/TypeSlice.d @ 113:3482c73a991b

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More cleanup for arrays
author Eldar Insafutdinov <e.insafutdinov@gmail.com>
date Tue, 31 Aug 2010 23:57:32 +0100
parents 2e2a5c3f943a
children e28b18c23469
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1 module dmd.TypeSlice;
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2
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3 import dmd.Type;
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4 import dmd.TypeNext;
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5 import dmd.MOD;
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6 import dmd.Expression;
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7 import dmd.Loc;
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8 import dmd.Scope;
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9 import dmd.Dsymbol;
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10 import dmd.OutBuffer;
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11 import dmd.HdrGenState;
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12 import dmd.TY;
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13 import dmd.TypeTuple;
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14 import dmd.WANT;
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15 import dmd.ArrayTypes;
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16 import dmd.Argument;
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17 import dmd.SliceExp;
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18 import dmd.TupleDeclaration;
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19 import dmd.ScopeDsymbol;
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20 import dmd.ArrayScopeSymbol;
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21
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22 import dmd.type.Util;
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23
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24 class TypeSlice : TypeNext
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25 {
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26 Expression lwr;
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27 Expression upr;
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28
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29 this(Type next, Expression lwr, Expression upr)
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30 {
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31 super(TY.Tslice, next);
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32 //printf("TypeSlice[%s .. %s]\n", lwr.toChars(), upr.toChars());
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33 this.lwr = lwr;
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34 this.upr = upr;
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35 }
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36
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37 version (DumbClone) {
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38 } else {
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39 Type clone()
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40 {
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41 assert(false);
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42 }
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43 }
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44
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45 override Type syntaxCopy()
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46 {
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47 Type t = new TypeSlice(next.syntaxCopy(), lwr.syntaxCopy(), upr.syntaxCopy());
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48 t.mod = mod;
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49 return t;
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50 }
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51
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52 override Type semantic(Loc loc, Scope sc)
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53 {
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54 //printf("TypeSlice.semantic() %s\n", toChars());
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55 next = next.semantic(loc, sc);
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56 transitive();
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57 //printf("next: %s\n", next.toChars());
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58
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59 Type tbn = next.toBasetype();
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60 if (tbn.ty != Ttuple)
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61 {
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62 error(loc, "can only slice tuple types, not %s", tbn.toChars());
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63 return Type.terror;
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64 }
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65 TypeTuple tt = cast(TypeTuple)tbn;
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66
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67 lwr = semanticLength(sc, tbn, lwr);
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68 lwr = lwr.optimize(WANTvalue);
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69 ulong i1 = lwr.toUInteger();
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70
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71 upr = semanticLength(sc, tbn, upr);
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72 upr = upr.optimize(WANTvalue);
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73 ulong i2 = upr.toUInteger();
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74
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75 if (!(i1 <= i2 && i2 <= tt.arguments.dim))
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76 {
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77 error(loc, "slice [%ju..%ju] is out of range of [0..%u]", i1, i2, tt.arguments.dim);
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78 return Type.terror;
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79 }
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80
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81 Arguments args = new Arguments;
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82 args.reserve(cast(size_t)(i2 - i1));
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83 for (size_t i = cast(size_t)i1; i < cast(size_t)i2; i++)
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84 {
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85 Argument arg = cast(Argument)tt.arguments.data[i];
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86 args.push(cast(void*)arg);
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87 }
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88
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89 return new TypeTuple(args);
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90 }
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91
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92 override void resolve(Loc loc, Scope sc, Expression* pe, Type* pt, Dsymbol* ps)
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93 {
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94 next.resolve(loc, sc, pe, pt, ps);
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95 if (*pe)
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96 { // It's really a slice expression
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97 Expression e;
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98 e = new SliceExp(loc, *pe, lwr, upr);
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99 *pe = e;
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100 }
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101 else if (*ps)
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102 {
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103 Dsymbol s = *ps;
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104 TupleDeclaration td = s.isTupleDeclaration();
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105 if (td)
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106 {
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107 /* It's a slice of a TupleDeclaration
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108 */
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109 ScopeDsymbol sym = new ArrayScopeSymbol(sc, td);
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110 sym.parent = sc.scopesym;
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111 sc = sc.push(sym);
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112
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113 lwr = lwr.semantic(sc);
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114 lwr = lwr.optimize(WANTvalue);
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115 ulong i1 = lwr.toUInteger();
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116
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117 upr = upr.semantic(sc);
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118 upr = upr.optimize(WANTvalue);
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119 ulong i2 = upr.toUInteger();
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120
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121 sc = sc.pop();
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122
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123 if (!(i1 <= i2 && i2 <= td.objects.dim))
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124 {
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125 error(loc, "slice [%ju..%ju] is out of range of [0..%u]", i1, i2, td.objects.dim);
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126 goto Ldefault;
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127 }
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128
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129 if (i1 == 0 && i2 == td.objects.dim)
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130 {
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131 *ps = td;
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132 return;
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133 }
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134
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135 /* Create a new TupleDeclaration which
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136 * is a slice [i1..i2] out of the old one.
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137 */
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138 auto objects = new Objects;
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139 objects.setDim(cast(uint)(i2 - i1));
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140 for (size_t i = 0; i < objects.dim; i++)
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141 {
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142 objects[i] = td.objects[cast(size_t)i1 + i];
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143 }
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144
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145 auto tds = new TupleDeclaration(loc, td.ident, objects);
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146 *ps = tds;
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147 }
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148 else
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149 goto Ldefault;
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150 }
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151 else
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152 {
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153 Ldefault:
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154 Type.resolve(loc, sc, pe, pt, ps);
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155 }
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156 }
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157
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158 override void toCBuffer2(OutBuffer buf, HdrGenState* hgs, MOD mod)
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159 {
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160 assert(false);
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161 }
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162 }