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annotate dmd/AliasDeclaration.d @ 72:2e2a5c3f943a

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reduced warnings by adding override to the methods think this also normalizes different line endings used all over the place
author Trass3r
date Sat, 28 Aug 2010 16:19:48 +0200
parents 5c9b78899f5d
children 43073c7c7769
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1 module dmd.AliasDeclaration;
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2
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3 import dmd.LINK;
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4 import dmd.Declaration;
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5 import dmd.TypedefDeclaration;
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6 import dmd.VarDeclaration;
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7 import dmd.FuncDeclaration;
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8 import dmd.FuncAliasDeclaration;
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9 import dmd.Dsymbol;
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10 import dmd.ScopeDsymbol;
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11 import dmd.Loc;
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12 import dmd.Identifier;
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13 import dmd.Type;
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14 import dmd.OutBuffer;
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15 import dmd.HdrGenState;
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16 import dmd.Scope;
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17 import dmd.STC;
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18 import dmd.Expression;
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19 import dmd.Global;
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20
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21 class AliasDeclaration : Declaration
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22 {
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23 Dsymbol aliassym;
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24 Dsymbol overnext; // next in overload list
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25 int inSemantic;
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26
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27 this(Loc loc, Identifier ident, Type type)
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28 {
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29 super(ident);
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30
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31 //printf("AliasDeclaration(id = '%s', type = %p)\n", id.toChars(), type);
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32 //printf("type = '%s'\n", type.toChars());
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33 this.loc = loc;
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34 this.type = type;
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35 this.aliassym = null;
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36 version (_DH) {
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37 this.htype = null;
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38 this.haliassym = null;
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39 }
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40
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41 assert(type);
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42 }
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43
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44 this(Loc loc, Identifier id, Dsymbol s)
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45 {
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46 super(id);
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47
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48 //printf("AliasDeclaration(id = '%s', s = %p)\n", id->toChars(), s);
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49 assert(s !is this); /// huh?
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50 this.loc = loc;
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51 this.type = null;
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52 this.aliassym = s;
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53 version (_DH) {
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54 this.htype = null;
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55 this.haliassym = null;
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56 }
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57 assert(s);
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58 }
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59
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60 override Dsymbol syntaxCopy(Dsymbol s)
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61 {
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62 //printf("AliasDeclaration::syntaxCopy()\n");
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63 assert(!s);
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64 AliasDeclaration sa;
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65 if (type)
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66 sa = new AliasDeclaration(loc, ident, type.syntaxCopy());
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67 else
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68 sa = new AliasDeclaration(loc, ident, aliassym.syntaxCopy(null));
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69 version (_DH) {
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70 // Syntax copy for header file
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71 if (!htype) // Don't overwrite original
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72 { if (type) // Make copy for both old and new instances
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73 { htype = type.syntaxCopy();
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74 sa.htype = type.syntaxCopy();
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75 }
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76 }
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77 else // Make copy of original for new instance
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78 sa.htype = htype.syntaxCopy();
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79 if (!haliassym)
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80 { if (aliassym)
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81 { haliassym = aliassym.syntaxCopy(s);
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82 sa.haliassym = aliassym.syntaxCopy(s);
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83 }
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84 }
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85 else
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86 sa.haliassym = haliassym.syntaxCopy(s);
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87 } // version (_DH)
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88 return sa;
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89 }
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90
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91 override void semantic(Scope sc)
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92 {
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93 //printf("AliasDeclaration.semantic() %s\n", toChars());
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94 if (aliassym)
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95 {
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96 if (aliassym.isTemplateInstance())
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97 aliassym.semantic(sc);
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98 return;
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99 }
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100 this.inSemantic = 1;
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101
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102 if (storage_class & STC.STCconst)
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103 error("cannot be const");
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104
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105 storage_class |= sc.stc & STC.STCdeprecated;
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106
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107 // Given:
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108 // alias foo.bar.abc def;
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109 // it is not knowable from the syntax whether this is an alias
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110 // for a type or an alias for a symbol. It is up to the semantic()
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111 // pass to distinguish.
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112 // If it is a type, then type is set and getType() will return that
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113 // type. If it is a symbol, then aliassym is set and type is null -
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114 // toAlias() will return aliasssym.
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115
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116 Dsymbol s;
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117 Type t;
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118 Expression e;
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119
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120 /* This section is needed because resolve() will:
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121 * const x = 3;
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122 * alias x y;
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123 * try to alias y to 3.
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124 */
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125 s = type.toDsymbol(sc);
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126 if (s && ((s.getType() && type.equals(s.getType())) || s.isEnumMember()))
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127 goto L2; // it's a symbolic alias
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128
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129 ///version (DMDV2) {
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130 if (storage_class & STC.STCref)
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131 { // For 'ref' to be attached to function types, and picked
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132 // up by Type.resolve(), it has to go into sc.
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133 sc = sc.push();
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134 sc.stc |= STC.STCref;
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135 type.resolve(loc, sc, &e, &t, &s);
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136 sc = sc.pop();
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137 }
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138 else
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139 /// #endif
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140 type.resolve(loc, sc, &e, &t, &s);
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141 if (s)
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142 {
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143 goto L2;
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144 }
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145 else if (e)
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146 {
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147 // Try to convert Expression to Dsymbol
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148 s = getDsymbol(e);
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149 if (s)
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150 goto L2;
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151
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152 error("cannot alias an expression %s", e.toChars());
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153 t = e.type;
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154 }
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155 else if (t)
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156 {
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157 type = t;
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158 }
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159 if (overnext)
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160 ScopeDsymbol.multiplyDefined(Loc(0), this, overnext);
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161 this.inSemantic = 0;
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162 return;
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163
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164 L2:
0
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165 //printf("alias is a symbol %s %s\n", s.kind(), s.toChars());
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166 type = null;
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167 VarDeclaration v = s.isVarDeclaration();
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168 if (v && v.linkage == LINK.LINKdefault)
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169 {
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170 error("forward reference of %s", v.toChars());
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171 s = null;
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172 }
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173 else
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174 {
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175 FuncDeclaration f = s.toAlias().isFuncDeclaration();
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176 if (f)
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177 {
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178 if (overnext)
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179 {
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180 FuncAliasDeclaration fa = new FuncAliasDeclaration(f);
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181 if (!fa.overloadInsert(overnext))
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182 ScopeDsymbol.multiplyDefined(Loc(0), f, overnext);
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183 overnext = null;
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184 s = fa;
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185 s.parent = sc.parent;
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186 }
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187 }
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188 if (overnext)
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189 ScopeDsymbol.multiplyDefined(Loc(0), s, overnext);
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190 if (s == this)
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191 {
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192 assert(global.errors);
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193 s = null;
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194 }
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195 }
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196 //printf("setting aliassym %p to %p\n", this, s);
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197 aliassym = s;
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198 this.inSemantic = 0;
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199 }
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200
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201 override bool overloadInsert(Dsymbol s)
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202 {
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203 /* Don't know yet what the aliased symbol is, so assume it can
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204 * be overloaded and check later for correctness.
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205 */
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206
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207 //printf("AliasDeclaration.overloadInsert('%s')\n", s.toChars());
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208 if (overnext is null)
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209 {
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210 overnext = s;
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211 return true;
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212 }
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213 else
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214 {
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215 return overnext.overloadInsert(s);
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216 }
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217 }
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218
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219 override string kind()
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220 {
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221 return "alias";
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222 }
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223
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224 override Type getType()
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225 {
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226 return type;
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227 }
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228
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229 override Dsymbol toAlias()
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230 {
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231 //printf("AliasDeclaration::toAlias('%s', this = %p, aliassym = %p, kind = '%s')\n", toChars(), this, aliassym, aliassym ? aliassym->kind() : "");
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232 assert(this !is aliassym);
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233 //static int count; if (++count == 10) *(char*)0=0;
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234 if (inSemantic)
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235 {
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236 error("recursive alias declaration");
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237 aliassym = new TypedefDeclaration(loc, ident, Type.terror, null);
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238 }
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239
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240 Dsymbol s = aliassym ? aliassym.toAlias() : this;
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241 return s;
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242 }
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243
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244 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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245 {
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246 assert(false);
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247 }
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248
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249 version (_DH) {
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250 Type htype;
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251 Dsymbol haliassym;
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252 }
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253 override void toDocBuffer(OutBuffer buf)
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254 {
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255 assert(false);
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256 }
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257
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258 override AliasDeclaration isAliasDeclaration() { return this; }
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259 }