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annotate dmd/AliasDeclaration.d @ 132:c494af1dba80

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Fixes for dmd 2.037
author Eldar Insafutdinov <e.insafutdinov@gmail.com>
date Fri, 10 Sep 2010 19:14:09 +0100
parents e28b18c23469
children af1bebfd96a4
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1 module dmd.AliasDeclaration;
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2
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3 import dmd.common;
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4 import dmd.LINK;
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5 import dmd.Declaration;
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6 import dmd.TypedefDeclaration;
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7 import dmd.VarDeclaration;
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8 import dmd.FuncDeclaration;
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9 import dmd.FuncAliasDeclaration;
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10 import dmd.Dsymbol;
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11 import dmd.ScopeDsymbol;
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12 import dmd.Loc;
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13 import dmd.Identifier;
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14 import dmd.Type;
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15 import dmd.OutBuffer;
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16 import dmd.HdrGenState;
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17 import dmd.Scope;
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18 import dmd.STC;
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19 import dmd.Expression;
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20 import dmd.Global;
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21
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22 class AliasDeclaration : Declaration
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23 {
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24 Dsymbol aliassym;
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25 Dsymbol overnext; // next in overload list
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26 int inSemantic;
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27
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28 this(Loc loc, Identifier ident, Type type)
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29 {
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30 super(ident);
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31
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32 //printf("AliasDeclaration(id = '%s', type = %p)\n", id.toChars(), type);
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33 //printf("type = '%s'\n", type.toChars());
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34 this.loc = loc;
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35 this.type = type;
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36 this.aliassym = null;
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37 version (_DH) {
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38 this.htype = null;
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39 this.haliassym = null;
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40 }
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41
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42 assert(type);
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43 }
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44
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45 this(Loc loc, Identifier id, Dsymbol s)
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46 {
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47 super(id);
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48
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49 //printf("AliasDeclaration(id = '%s', s = %p)\n", id->toChars(), s);
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50 assert(s !is this); /// huh?
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51 this.loc = loc;
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52 this.type = null;
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53 this.aliassym = s;
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54 version (_DH) {
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55 this.htype = null;
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56 this.haliassym = null;
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57 }
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58 assert(s);
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59 }
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60
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61 override Dsymbol syntaxCopy(Dsymbol s)
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62 {
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63 //printf("AliasDeclaration::syntaxCopy()\n");
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64 assert(!s);
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65 AliasDeclaration sa;
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66 if (type)
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67 sa = new AliasDeclaration(loc, ident, type.syntaxCopy());
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68 else
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69 sa = new AliasDeclaration(loc, ident, aliassym.syntaxCopy(null));
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70 version (_DH) {
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71 // Syntax copy for header file
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72 if (!htype) // Don't overwrite original
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73 { if (type) // Make copy for both old and new instances
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74 { htype = type.syntaxCopy();
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75 sa.htype = type.syntaxCopy();
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76 }
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77 }
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78 else // Make copy of original for new instance
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79 sa.htype = htype.syntaxCopy();
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80 if (!haliassym)
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81 { if (aliassym)
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82 { haliassym = aliassym.syntaxCopy(s);
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83 sa.haliassym = aliassym.syntaxCopy(s);
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84 }
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85 }
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86 else
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87 sa.haliassym = haliassym.syntaxCopy(s);
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88 } // version (_DH)
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89 return sa;
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90 }
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91
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92 override void semantic(Scope sc)
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93 {
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94 //printf("AliasDeclaration.semantic() %s\n", toChars());
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95 if (aliassym)
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96 {
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97 if (aliassym.isTemplateInstance())
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98 aliassym.semantic(sc);
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99 return;
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100 }
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101 this.inSemantic = 1;
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102
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103 if (storage_class & STC.STCconst)
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104 error("cannot be const");
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105
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106 storage_class |= sc.stc & STC.STCdeprecated;
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107
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108 // Given:
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109 // alias foo.bar.abc def;
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110 // it is not knowable from the syntax whether this is an alias
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111 // for a type or an alias for a symbol. It is up to the semantic()
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112 // pass to distinguish.
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113 // If it is a type, then type is set and getType() will return that
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114 // type. If it is a symbol, then aliassym is set and type is null -
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115 // toAlias() will return aliasssym.
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116
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117 Dsymbol s;
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118 Type t;
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119 Expression e;
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120
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121 /* This section is needed because resolve() will:
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122 * const x = 3;
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123 * alias x y;
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124 * try to alias y to 3.
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125 */
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126 s = type.toDsymbol(sc);
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127 if (s && ((s.getType() && type.equals(s.getType())) || s.isEnumMember()))
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128 goto L2; // it's a symbolic alias
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129
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130 ///version (DMDV2) {
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131 if (storage_class & (STC.STCref | STCnothrow | STCpure))
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132 { // For 'ref' to be attached to function types, and picked
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133 // up by Type.resolve(), it has to go into sc.
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134 sc = sc.push();
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135 sc.stc |= storage_class & (STCref | STCnothrow | STCpure);
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136 type.resolve(loc, sc, &e, &t, &s);
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137 sc = sc.pop();
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138 }
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139 else
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140 /// #endif
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141 type.resolve(loc, sc, &e, &t, &s);
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142 if (s)
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143 {
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144 goto L2;
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145 }
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146 else if (e)
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147 {
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148 // Try to convert Expression to Dsymbol
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149 s = getDsymbol(e);
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150 if (s)
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151 goto L2;
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152
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153 error("cannot alias an expression %s", e.toChars());
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154 t = e.type;
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155 }
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156 else if (t)
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157 {
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158 type = t;
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159 }
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160 if (overnext)
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161 ScopeDsymbol.multiplyDefined(Loc(0), this, overnext);
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162 this.inSemantic = 0;
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163 return;
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164
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165 L2:
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166 //printf("alias is a symbol %s %s\n", s.kind(), s.toChars());
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167 type = null;
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168 VarDeclaration v = s.isVarDeclaration();
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169 if (v && v.linkage == LINK.LINKdefault)
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170 {
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171 error("forward reference of %s", v.toChars());
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172 s = null;
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173 }
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174 else
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175 {
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176 FuncDeclaration f = s.toAlias().isFuncDeclaration();
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177 if (f)
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178 {
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179 if (overnext)
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180 {
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181 FuncAliasDeclaration fa = new FuncAliasDeclaration(f);
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182 if (!fa.overloadInsert(overnext))
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183 ScopeDsymbol.multiplyDefined(Loc(0), f, overnext);
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184 overnext = null;
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185 s = fa;
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186 s.parent = sc.parent;
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187 }
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188 }
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189 if (overnext)
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190 ScopeDsymbol.multiplyDefined(Loc(0), s, overnext);
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191 if (s == this)
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192 {
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193 assert(global.errors);
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194 s = null;
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195 }
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196 }
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197 //printf("setting aliassym %p to %p\n", this, s);
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198 aliassym = s;
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199 this.inSemantic = 0;
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200 }
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201
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202 override bool overloadInsert(Dsymbol s)
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203 {
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204 /* Don't know yet what the aliased symbol is, so assume it can
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205 * be overloaded and check later for correctness.
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206 */
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207
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208 //printf("AliasDeclaration.overloadInsert('%s')\n", s.toChars());
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209 if (overnext is null)
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210 {
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211 static if (true)
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212 {
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213 if (s is this)
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214 return true;
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215 }
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216 overnext = s;
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217 return true;
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218
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219 }
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220 else
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221 {
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222 return overnext.overloadInsert(s);
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223 }
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224 }
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225
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226 override string kind()
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227 {
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228 return "alias";
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229 }
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230
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231 override Type getType()
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232 {
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233 return type;
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234 }
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235
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236 override Dsymbol toAlias()
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237 {
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238 //printf("AliasDeclaration::toAlias('%s', this = %p, aliassym = %p, kind = '%s')\n", toChars(), this, aliassym, aliassym ? aliassym->kind() : "");
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239 assert(this !is aliassym);
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240 //static int count; if (++count == 10) *(char*)0=0;
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241 if (inSemantic)
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242 {
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243 error("recursive alias declaration");
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244 aliassym = new TypedefDeclaration(loc, ident, Type.terror, null);
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245 }
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246
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247 Dsymbol s = aliassym ? aliassym.toAlias() : this;
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248 return s;
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249 }
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250
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251 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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252 {
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253 assert(false);
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254 }
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255
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256 version (_DH) {
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257 Type htype;
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258 Dsymbol haliassym;
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259 }
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260 override void toDocBuffer(OutBuffer buf)
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261 {
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262 assert(false);
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263 }
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264
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265 override AliasDeclaration isAliasDeclaration() { return this; }
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266 }