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annotate dmd/SymbolExp.d @ 178:e3afd1303184

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Many small bugs fixed Made all classes derive from TObject to detect memory leaks (functionality is disabled for now) Began work on overriding backend memory allocations (to avoid memory leaks)
author korDen
date Sun, 17 Oct 2010 07:42:00 +0400
parents e28b18c23469
children cd48cb899aee
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1 module dmd.SymbolExp;
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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.Declaration;
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6 import dmd.Loc;
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7 import dmd.IRState;
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8 import dmd.TOK;
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9 import dmd.TY;
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10 import dmd.Type;
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11 import dmd.SymOffExp;
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12 import dmd.FuncDeclaration;
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13 import dmd.VarDeclaration;
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14 import dmd.backend.OPER;
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15 import dmd.backend.TYM;
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16 import dmd.backend.mTY;
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17 import dmd.backend.SC;
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18 import dmd.backend.elem;
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19 import dmd.backend.Symbol;
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20 import dmd.backend.Util;
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21 import dmd.codegen.Util;
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22
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23 version(DMDV2)
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24 class SymbolExp : Expression
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25 {
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26 Declaration var;
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27
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ef02e2e203c2 Updating to dmd2.033
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28 bool hasOverloads;
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29
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30 this(Loc loc, TOK op, int size, Declaration var, bool hasOverloads)
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31 {
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32 register();
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33 super(loc, op, size);
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34 assert(var);
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35 this.var = var;
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36 this.hasOverloads = hasOverloads;
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37 }
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38
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39 override elem* toElem(IRState* irs)
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40 {
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41 Symbol* s;
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42 elem* e;
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43 tym_t tym;
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44 Type tb = (op == TOK.TOKsymoff) ? var.type.toBasetype() : type.toBasetype();
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45 int offset = (op == TOK.TOKsymoff) ? (cast(SymOffExp)this).offset : 0;
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46 FuncDeclaration fd;
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47 VarDeclaration v = var.isVarDeclaration();
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48
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49 //printf("SymbolExp::toElem('%s') %p\n", toChars(), this);
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50 //printf("\tparent = '%s'\n", var.parent ? var.parent.toChars() : "null");
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51 if (op == TOK.TOKvar && var.needThis())
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52 {
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53 error("need 'this' to access member %s", toChars());
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54 return el_long(TYM.TYint, 0);
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55 }
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56 s = var.toSymbol();
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57 fd = null;
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58 if (var.toParent2())
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59 fd = var.toParent2().isFuncDeclaration();
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60
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61 int nrvo = 0;
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62 if (fd && fd.nrvo_can && fd.nrvo_var == var)
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63 {
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64 s = fd.shidden;
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65 nrvo = 1;
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66 }
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67
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68 if (s.Sclass == SC.SCauto || s.Sclass == SC.SCparameter)
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69 {
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70 if (fd && fd != irs.getFunc())
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71 {
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72 // 'var' is a variable in an enclosing function.
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73 elem* ethis;
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74 int soffset;
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75
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76 ethis = getEthis(loc, irs, fd);
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77 ethis = el_una(OPER.OPaddr, TYM.TYnptr, ethis);
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78
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79 if (v && v.offset)
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80 soffset = v.offset;
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81 else
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82 {
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83 soffset = s.Soffset;
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84 /* If fd is a non-static member function of a class or struct,
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85 * then ethis isn't the frame pointer.
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86 * ethis is the 'this' pointer to the class/struct instance.
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87 * We must offset it.
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88 */
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89 if (fd.vthis)
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90 {
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91 soffset -= fd.vthis.toSymbol().Soffset;
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92 }
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93 //printf("\tSoffset = x%x, sthis.Soffset = x%x\n", s.Soffset, irs.sthis.Soffset);
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94 }
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95
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96 if (!nrvo)
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97 soffset += offset;
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98
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99 e = el_bin(OPER.OPadd, TYM.TYnptr, ethis, el_long(TYM.TYnptr, soffset));
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100
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101 if (op == TOK.TOKvar)
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102 e = el_una(OPER.OPind, TYM.TYnptr, e);
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103 if (ISREF(var, tb))
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104 e = el_una(OPER.OPind, s.ty(), e);
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105 else if (op == TOK.TOKsymoff && nrvo)
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106 {
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107 e = el_una(OPER.OPind, TYM.TYnptr, e);
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108 e = el_bin(OPER.OPadd, e.Ety, e, el_long(TYM.TYint, offset));
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109 }
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110 goto L1;
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111 }
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112 }
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113
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114 /* If var is a member of a closure
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115 */
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116 if (v && v.offset)
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117 {
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118 assert(irs.sclosure);
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119 e = el_var(irs.sclosure);
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120 e = el_bin(OPER.OPadd, TYM.TYnptr, e, el_long(TYM.TYint, v.offset));
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121 if (op == TOK.TOKvar)
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122 {
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123 e = el_una(OPER.OPind, type.totym(), e);
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124 if (tybasic(e.Ety) == TYM.TYstruct)
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125 e.Enumbytes = cast(uint)type.size();
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126 el_setLoc(e, loc);
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127 }
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128 if (ISREF(var, tb))
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129 {
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130 e.Ety = TYM.TYnptr;
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131 e = el_una(OPER.OPind, s.ty(), e);
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132 }
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133 else if (op == TOK.TOKsymoff && nrvo)
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134 { e = el_una(OPER.OPind, TYM.TYnptr, e);
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135 e = el_bin(OPER.OPadd, e.Ety, e, el_long(TYM.TYint, offset));
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136 }
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137 else if (op == TOK.TOKsymoff)
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138 {
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139 e = el_bin(OPER.OPadd, e.Ety, e, el_long(TYM.TYint, offset));
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140 }
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141 goto L1;
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142 }
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143
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144 if (s.Sclass == SC.SCauto && s.Ssymnum == -1)
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145 {
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146 //printf("\tadding symbol\n");
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147 symbol_add(s);
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148 }
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149
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150 if (var.isImportedSymbol())
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151 {
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152 assert(op == TOK.TOKvar);
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153 e = el_var(var.toImport());
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154 e = el_una(OPER.OPind,s.ty(),e);
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155 }
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156 else if (ISREF(var, tb))
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157 {
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158 // Static arrays are really passed as pointers to the array
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159 // Out parameters are really references
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160 e = el_var(s);
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161 e.Ety = TYM.TYnptr;
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162 if (op == TOK.TOKvar)
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163 e = el_una(OPER.OPind, s.ty(), e);
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164 else if (offset)
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165 e = el_bin(OPER.OPadd, TYM.TYnptr, e, el_long(TYM.TYint, offset));
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166 }
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167 else if (op == TOK.TOKvar)
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168 e = el_var(s);
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169 else
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170 {
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171 e = nrvo ? el_var(s) : el_ptr(s);
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172 e = el_bin(OPER.OPadd, e.Ety, e, el_long(TYM.TYint, offset));
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173 }
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174 L1:
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175 if (op == TOK.TOKvar)
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176 {
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177 if (nrvo)
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178 {
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179 e.Ety = TYM.TYnptr;
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180 e = el_una(OPER.OPind, 0, e);
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181 }
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182 if (tb.ty == TY.Tfunction)
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183 {
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184 tym = s.Stype.Tty;
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185 }
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186 else
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187 tym = type.totym();
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188 e.Ejty = cast(ubyte)tym;
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189 e.Ety = e.Ejty;
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190 if (tybasic(tym) == TYM.TYstruct)
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191 {
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192 e.Enumbytes = cast(uint)type.size();
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193 }
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194 else if (tybasic(tym) == TYM.TYarray)
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195 {
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196 e.Ejty = TYM.TYstruct;
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197 e.Ety = e.Ejty;
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198 e.Enumbytes = cast(uint)type.size();
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199 }
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200 }
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201 el_setLoc(e,loc);
0
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202 return e;
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203 }
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204 }
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205