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annotate dmd/DotIdExp.d @ 136:9d194c848e3a

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fixed a few null reference bugs, thx sagitario
author Trass3r
date Mon, 13 Sep 2010 23:27:38 +0200
parents 60bb0fe4563e
children e3afd1303184
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1 module dmd.DotIdExp;
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2
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3 import dmd.common;
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4 import dmd.Expression;
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5 import dmd.Identifier;
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6 import dmd.IntegerExp;
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7 import dmd.Type;
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8 import dmd.TY;
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9 import dmd.ScopeExp;
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10 import dmd.StringExp;
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11 import dmd.PtrExp;
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12 import dmd.TypePointer;
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13 import dmd.Dsymbol;
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14 import dmd.EnumMember;
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15 import dmd.VarDeclaration;
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16 import dmd.ThisExp;
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17 import dmd.DotVarExp;
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18 import dmd.VarExp;
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19 import dmd.CommaExp;
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20 import dmd.FuncDeclaration;
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21 import dmd.OverloadSet;
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22 import dmd.OverExp;
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23 import dmd.TypeExp;
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24 import dmd.TupleDeclaration;
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25 import dmd.ScopeDsymbol;
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26 import dmd.Import;
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27 import dmd.Id;
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28 import dmd.TupleExp;
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29 import dmd.ArrayTypes;
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30 import dmd.UnaExp;
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31 import dmd.OutBuffer;
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32 import dmd.Loc;
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33 import dmd.Scope;
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34 import dmd.TOK;
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35 import dmd.HdrGenState;
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36 import dmd.ClassDeclaration;
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37 import dmd.StructDeclaration;
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38 import dmd.AggregateDeclaration;
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39 import dmd.DotExp;
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40 import dmd.Global;
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41 import dmd.IdentifierExp;
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42 import dmd.CallExp;
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43 import dmd.PREC;
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44
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45 import dmd.expression.Util;
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46
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47 class DotIdExp : UnaExp
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48 {
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49 Identifier ident;
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50
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51 this(Loc loc, Expression e, Identifier ident)
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52 {
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53 super(loc, TOK.TOKdot, DotIdExp.sizeof, e);
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54 this.ident = ident;
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55 }
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56
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57 override Expression semantic(Scope sc)
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58 {
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59 // Indicate we didn't come from CallExp::semantic()
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60 return semantic(sc, 0);
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61 }
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62
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63 Expression semantic(Scope sc, int flag)
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64 {
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65 Expression e;
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66 Expression eleft;
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67 Expression eright;
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68
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69 version (LOGSEMANTIC) {
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70 printf("DotIdExp.semantic(this = %p, '%s')\n", this, toChars());
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71 //printf("e1.op = %d, '%s'\n", e1.op, Token.toChars(e1.op));
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72 }
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73
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74 //{ static int z; fflush(stdout); if (++z == 10) *(char*)0=0; }
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75
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76 static if (false) {
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77 /* Don't do semantic analysis if we'll be converting
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78 * it to a string.
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79 */
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80 if (ident == Id.stringof)
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81 {
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82 char *s = e1.toChars();
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83 e = new StringExp(loc, s, strlen(s), 'c');
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84 e = e.semantic(sc);
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85 return e;
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86 }
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87 }
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88
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89 /* Special case: rewrite this.id and super.id
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90 * to be classtype.id and baseclasstype.id
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91 * if we have no this pointer.
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92 */
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93 if ((e1.op == TOK.TOKthis || e1.op == TOK.TOKsuper) && !hasThis(sc))
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94 {
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95 ClassDeclaration cd;
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96 StructDeclaration sd;
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97 AggregateDeclaration ad;
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98
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99 ad = sc.getStructClassScope();
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100 if (ad)
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101 {
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102 cd = ad.isClassDeclaration();
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103 if (cd)
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104 {
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105 if (e1.op == TOK.TOKthis)
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106 {
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107 e = typeDotIdExp(loc, cd.type, ident);
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108 return e.semantic(sc);
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109 }
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110 else if (cd.baseClass && e1.op == TOK.TOKsuper)
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111 {
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112 e = typeDotIdExp(loc, cd.baseClass.type, ident);
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113 return e.semantic(sc);
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114 }
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115 }
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116 else
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117 {
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118 sd = ad.isStructDeclaration();
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119 if (sd)
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120 {
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121 if (e1.op == TOK.TOKthis)
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122 {
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123 e = typeDotIdExp(loc, sd.type, ident);
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124 return e.semantic(sc);
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125 }
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126 }
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127 }
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128 }
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129 }
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130
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131 UnaExp.semantic(sc);
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132
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133 if (e1.op == TOK.TOKdotexp)
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134 {
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135 DotExp de = cast(DotExp)e1;
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136 eleft = de.e1;
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137 eright = de.e2;
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138 }
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139 else
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140 {
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141 e1 = resolveProperties(sc, e1);
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142 eleft = null;
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143 eright = e1;
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144 }
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145
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146 version (DMDV2) {
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147 if (e1.op == TOK.TOKtuple && ident == Id.offsetof)
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148 {
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149 /* 'distribute' the .offsetof to each of the tuple elements.
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150 */
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151 TupleExp te = cast(TupleExp)e1;
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152 Expressions exps = new Expressions();
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153 exps.setDim(te.exps.dim);
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154 for (int i = 0; i < exps.dim; i++)
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155 {
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156 auto ee = te.exps[i];
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157 ee = ee.semantic(sc);
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158 ee = new DotIdExp(ee.loc, ee, Id.offsetof);
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159 exps[i] = ee;
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160 }
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161 e = new TupleExp(loc, exps);
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162 e = e.semantic(sc);
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163 return e;
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164 }
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165 }
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166
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167 if (e1.op == TOK.TOKtuple && ident == Id.length)
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168 {
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169 TupleExp te = cast(TupleExp)e1;
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170 e = new IntegerExp(loc, te.exps.dim, Type.tsize_t);
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171 return e;
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172 }
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173
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174 if (e1.op == TOK.TOKdottd)
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175 {
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176 error("template %s does not have property %s", e1.toChars(), ident.toChars());
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177 return e1;
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178 }
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179
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180 if (!e1.type)
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181 {
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182 error("expression %s does not have property %s", e1.toChars(), ident.toChars());
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183 return e1;
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184 }
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185
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186 Type t1b = e1.type.toBasetype();
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187
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188 if (eright.op == TOK.TOKimport) // also used for template alias's
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189 {
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190 ScopeExp ie = cast(ScopeExp)eright;
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191
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192 /* Disable access to another module's private imports.
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193 * The check for 'is sds our current module' is because
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194 * the current module should have access to its own imports.
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195 */
130
60bb0fe4563e dmdfe 2.037 first main iteration
Eldar Insafutdinov <e.insafutdinov@gmail.com>
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196 Dsymbol s = ie.sds.search(loc, ident, //0);
72
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197 (ie.sds.isModule() && ie.sds != sc.module_) ? 1 : 0);
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198 if (s)
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199 {
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200 s = s.toAlias();
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201 checkDeprecated(sc, s);
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202
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203 EnumMember em = s.isEnumMember();
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204 if (em)
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205 {
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206 e = em.value;
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207 e = e.semantic(sc);
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208 return e;
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209 }
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210
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211 VarDeclaration v = s.isVarDeclaration();
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212 if (v)
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213 {
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214 //printf("DotIdExp. Identifier '%s' is a variable, type '%s'\n", toChars(), v.type.toChars());
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215 if (v.inuse)
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216 {
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217 error("circular reference to '%s'", v.toChars());
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218 type = Type.tint32;
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219 return this;
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220 }
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221 type = v.type;
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222 if (v.needThis())
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223 {
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224 if (!eleft)
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225 eleft = new ThisExp(loc);
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226 e = new DotVarExp(loc, eleft, v);
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227 e = e.semantic(sc);
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228 }
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229 else
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230 {
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231 e = new VarExp(loc, v);
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232 if (eleft)
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233 {
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234 e = new CommaExp(loc, eleft, e);
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235 e.type = v.type;
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236 }
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237 }
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238 return e.deref();
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239 }
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240
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241 FuncDeclaration f = s.isFuncDeclaration();
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242 if (f)
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243 {
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244 //printf("it's a function\n");
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245 if (f.needThis())
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246 {
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247 if (!eleft)
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248 eleft = new ThisExp(loc);
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249 e = new DotVarExp(loc, eleft, f);
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250 e = e.semantic(sc);
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251 }
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252 else
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253 {
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254 e = new VarExp(loc, f, 1);
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255 if (eleft)
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256 { e = new CommaExp(loc, eleft, e);
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257 e.type = f.type;
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258 }
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259 }
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260 return e;
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261 }
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262 version (DMDV2) {
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263 OverloadSet o = s.isOverloadSet();
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264 if (o)
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265 {
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266 //printf("'%s' is an overload set\n", o.toChars());
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267 return new OverExp(o);
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268 }
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269 }
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270
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271 Type t = s.getType();
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272 if (t)
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273 {
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274 return new TypeExp(loc, t);
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275 }
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276
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277 TupleDeclaration tup = s.isTupleDeclaration();
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278 if (tup)
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279 {
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280 if (eleft)
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281 error("cannot have e.tuple");
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282 e = new TupleExp(loc, tup);
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283 e = e.semantic(sc);
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284 return e;
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285 }
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286
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287 ScopeDsymbol sds = s.isScopeDsymbol();
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288 if (sds)
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289 {
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290 //printf("it's a ScopeDsymbol\n");
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291 e = new ScopeExp(loc, sds);
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292 e = e.semantic(sc);
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293 if (eleft)
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294 e = new DotExp(loc, eleft, e);
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295 return e;
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296 }
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297
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298 Import imp = s.isImport();
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299 if (imp)
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300 {
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301 ScopeExp iee = new ScopeExp(loc, imp.pkg);
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302 return iee.semantic(sc);
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parents: 0
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303 }
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304
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305 // BUG: handle other cases like in IdentifierExp.semantic()
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306 version (DEBUG) {
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307 printf("s = '%s', kind = '%s'\n", s.toChars(), s.kind());
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308 }
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diff changeset
309 assert(0);
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310 }
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311 else if (ident is Id.stringof_)
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312 {
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diff changeset
313 string ss = ie.toChars();
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314 e = new StringExp(loc, ss, 'c');
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315 e = e.semantic(sc);
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316 return e;
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317 }
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318 error("undefined identifier %s", toChars());
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319 type = Type.tvoid;
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320 return this;
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321 }
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322 else if (t1b.ty == TY.Tpointer &&
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diff changeset
323 ident !is Id.init_ && ident !is Id.__sizeof &&
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324 ident !is Id.alignof_ && ident !is Id.offsetof &&
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325 ident !is Id.mangleof_ && ident !is Id.stringof_)
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326 { /* Rewrite:
2e2a5c3f943a reduced warnings by adding override to the methods
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327 * p.ident
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328 * as:
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329 * (*p).ident
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330 */
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331 e = new PtrExp(loc, e1);
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332 e.type = (cast(TypePointer)t1b).next;
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333 return e.type.dotExp(sc, e, ident);
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334 }
2e2a5c3f943a reduced warnings by adding override to the methods
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diff changeset
335 ///version (DMDV2) {
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336 else if (t1b.ty == TY.Tarray ||
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337 t1b.ty == TY.Tsarray ||
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338 t1b.ty == TY.Taarray)
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339 {
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diff changeset
340 /* If ident is not a valid property, rewrite:
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341 * e1.ident
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342 * as:
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343 * .ident(e1)
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344 */
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345 uint errors = global.errors;
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346 global.gag++;
109
ceda59b4d255 expression.c changes, now only ddoc should be left
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347 Type t1 = e1.type;
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348 e = e1.type.dotExp(sc, e1, ident);
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349 global.gag--;
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350 if (errors != global.errors) // if failed to find the property
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351 {
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352 global.errors = errors;
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353 e1.type = t1; // kludge to restore type
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354 e = new DotIdExp(loc, new IdentifierExp(loc, Id.empty), ident);
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355 e = new CallExp(loc, e, e1);
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356 }
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357 e = e.semantic(sc);
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358 return e;
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359 }
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360 ///}
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361 else
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362 {
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363 e = e1.type.dotExp(sc, e1, ident);
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364 if (!(flag && e.op == TOK.TOKdotti)) // let CallExp::semantic() handle this
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365 e = e.semantic(sc);
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366 return e;
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367 }
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368 }
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369
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370 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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371 {
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372 //printf("DotIdExp.toCBuffer()\n");
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373 expToCBuffer(buf, hgs, e1, PREC.PREC_primary);
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374 buf.writeByte('.');
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375 buf.writestring(ident.toChars());
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376 }
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377
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378 override void dump(int i)
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379 {
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380 assert(false);
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381 }
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382 }
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