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annotate dmd/AliasDeclaration.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 cd48cb899aee
children
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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 import dmd.DDMDExtensions;
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23
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24 class AliasDeclaration : Declaration
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25 {
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26 mixin insertMemberExtension!(typeof(this));
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27
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28 Dsymbol aliassym;
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29 Dsymbol overnext; // next in overload list
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30 int inSemantic;
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31
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32 this(Loc loc, Identifier ident, Type type)
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33 {
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34 register();
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35 super(ident);
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36
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37 //printf("AliasDeclaration(id = '%s', type = %p)\n", id.toChars(), type);
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38 //printf("type = '%s'\n", type.toChars());
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39 this.loc = loc;
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40 this.type = type;
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41 this.aliassym = null;
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42 version (_DH) {
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43 this.htype = null;
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44 this.haliassym = null;
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45 }
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46
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47 assert(type);
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48 }
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49
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50 this(Loc loc, Identifier id, Dsymbol s)
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51 {
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52 register();
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53 super(id);
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54
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55 //printf("AliasDeclaration(id = '%s', s = %p)\n", id->toChars(), s);
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56 assert(s !is this); /// huh?
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57 this.loc = loc;
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58 this.type = null;
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59 this.aliassym = s;
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60 version (_DH) {
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61 this.htype = null;
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62 this.haliassym = null;
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63 }
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64 assert(s);
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65 }
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66
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67 override Dsymbol syntaxCopy(Dsymbol s)
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68 {
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69 //printf("AliasDeclaration::syntaxCopy()\n");
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70 assert(!s);
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71 AliasDeclaration sa;
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72 if (type)
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73 sa = new AliasDeclaration(loc, ident, type.syntaxCopy());
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74 else
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75 sa = new AliasDeclaration(loc, ident, aliassym.syntaxCopy(null));
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76 version (_DH) {
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77 // Syntax copy for header file
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78 if (!htype) // Don't overwrite original
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79 { if (type) // Make copy for both old and new instances
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80 { htype = type.syntaxCopy();
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81 sa.htype = type.syntaxCopy();
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82 }
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83 }
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84 else // Make copy of original for new instance
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85 sa.htype = htype.syntaxCopy();
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86 if (!haliassym)
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87 { if (aliassym)
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88 { haliassym = aliassym.syntaxCopy(s);
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89 sa.haliassym = aliassym.syntaxCopy(s);
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90 }
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91 }
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92 else
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93 sa.haliassym = haliassym.syntaxCopy(s);
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94 } // version (_DH)
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95 return sa;
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96 }
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97
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98 override void semantic(Scope sc)
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99 {
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100 //printf("AliasDeclaration.semantic() %s\n", toChars());
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101 if (aliassym)
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102 {
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103 if (aliassym.isTemplateInstance())
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104 aliassym.semantic(sc);
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105 return;
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106 }
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107 this.inSemantic = 1;
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108
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109 version(DMDV1) { // don't really know why this is here
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110 if (storage_class & STC.STCconst)
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111 error("cannot be const");
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112 }
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113 storage_class |= sc.stc & STC.STCdeprecated;
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114
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115 // Given:
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116 // alias foo.bar.abc def;
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117 // it is not knowable from the syntax whether this is an alias
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118 // for a type or an alias for a symbol. It is up to the semantic()
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119 // pass to distinguish.
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120 // If it is a type, then type is set and getType() will return that
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121 // type. If it is a symbol, then aliassym is set and type is null -
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122 // toAlias() will return aliasssym.
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123
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124 Dsymbol s;
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125 Type t;
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126 Expression e;
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127
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128 /* This section is needed because resolve() will:
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129 * const x = 3;
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130 * alias x y;
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131 * try to alias y to 3.
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132 */
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133 s = type.toDsymbol(sc);
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134 if (s && ((s.getType() && type.equals(s.getType())) || s.isEnumMember()))
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135 goto L2; // it's a symbolic alias
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136
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137 ///version (DMDV2) {
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138 type = type.addStorageClass(storage_class);
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139 if (storage_class & (STC.STCref | STCnothrow | STCpure | STCdisable))
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140 { // For 'ref' to be attached to function types, and picked
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141 // up by Type.resolve(), it has to go into sc.
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142 sc = sc.push();
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143 sc.stc |= storage_class & (STCref | STCnothrow | STCpure | STCshared | STCdisable);
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144 type.resolve(loc, sc, &e, &t, &s);
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145 sc = sc.pop();
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146 }
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147 else
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148 /// #endif
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149 type.resolve(loc, sc, &e, &t, &s);
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150 if (s)
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151 {
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152 goto L2;
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153 }
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154 else if (e)
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155 {
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156 // Try to convert Expression to Dsymbol
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157 s = getDsymbol(e);
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158 if (s)
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159 goto L2;
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160
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161 error("cannot alias an expression %s", e.toChars());
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162 t = e.type;
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163 }
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164 else if (t)
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165 {
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166 type = t;
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167 }
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168 if (overnext)
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169 ScopeDsymbol.multiplyDefined(Loc(0), this, overnext);
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170 this.inSemantic = 0;
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171 return;
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172
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173 L2:
0
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174 //printf("alias is a symbol %s %s\n", s.kind(), s.toChars());
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175 type = null;
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176 VarDeclaration v = s.isVarDeclaration();
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177 if (v && v.linkage == LINK.LINKdefault)
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178 {
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179 error("forward reference of %s", v.toChars());
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180 s = null;
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181 }
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182 else
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183 {
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184 FuncDeclaration f = s.toAlias().isFuncDeclaration();
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185 if (f)
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186 {
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187 if (overnext)
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188 {
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189 FuncAliasDeclaration fa = new FuncAliasDeclaration(f);
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190 if (!fa.overloadInsert(overnext))
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191 ScopeDsymbol.multiplyDefined(Loc(0), f, overnext);
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192 overnext = null;
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193 s = fa;
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194 s.parent = sc.parent;
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195 }
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196 }
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197 if (overnext)
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198 ScopeDsymbol.multiplyDefined(Loc(0), s, overnext);
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199 if (s == this)
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200 {
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201 assert(global.errors);
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202 s = null;
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203 }
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204 }
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205 //printf("setting aliassym %p to %p\n", this, s);
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206 aliassym = s;
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207 this.inSemantic = 0;
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208 }
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209
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210 override bool overloadInsert(Dsymbol s)
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211 {
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212 /* Don't know yet what the aliased symbol is, so assume it can
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213 * be overloaded and check later for correctness.
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214 */
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215
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216 //printf("AliasDeclaration.overloadInsert('%s')\n", s.toChars());
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217 if (overnext is null)
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218 {
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219 static if (true)
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220 {
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221 if (s is this)
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222 return true;
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223 }
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224 overnext = s;
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225 return true;
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226
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227 }
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228 else
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229 {
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230 return overnext.overloadInsert(s);
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231 }
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232 }
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233
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234 override string kind()
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235 {
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236 return "alias";
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237 }
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238
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239 override Type getType()
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240 {
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241 return type;
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242 }
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243
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244 override Dsymbol toAlias()
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245 {
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246 //printf("AliasDeclaration::toAlias('%s', this = %p, aliassym = %p, kind = '%s')\n", toChars(), this, aliassym, aliassym ? aliassym->kind() : "");
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247 assert(this !is aliassym);
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248 //static int count; if (++count == 10) *(char*)0=0;
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249 if (inSemantic)
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250 {
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251 error("recursive alias declaration");
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252 aliassym = new TypedefDeclaration(loc, ident, Type.terror, null);
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253 }
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254
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255 Dsymbol s = aliassym ? aliassym.toAlias() : this;
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256 return s;
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257 }
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258
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259 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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260 {
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261 buf.writestring("alias ");
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262 /// static if (false) { // && _DH
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263 /// if (hgs.hdrgen)
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264 /// {
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265 /// if (haliassym)
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266 /// {
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267 /// haliassym.toCBuffer(buf, hgs);
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268 /// buf.writeByte(' ');
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269 /// buf.writestring(ident.toChars());
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270 /// }
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271 /// else
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272 /// htype.toCBuffer(buf, ident, hgs);
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273 /// }
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274 /// else
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275 /// }
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276 {
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277 if (aliassym)
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278 {
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279 aliassym.toCBuffer(buf, hgs);
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280 buf.writeByte(' ');
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281 buf.writestring(ident.toChars());
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282 }
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283 else
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284 type.toCBuffer(buf, ident, hgs);
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285 }
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286 buf.writeByte(';');
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287 buf.writenl();
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288 }
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289
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290 version (_DH) {
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291 Type htype;
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292 Dsymbol haliassym;
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293 }
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294 override void toDocBuffer(OutBuffer buf)
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295 {
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296 assert(false);
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297 }
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298
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299 override AliasDeclaration isAliasDeclaration() { return this; }
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300 }