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annotate dmd/SymbolExp.d @ 179:cd48cb899aee

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Updated to dmd2.040
author korDen
date Sun, 17 Oct 2010 20:56:07 +0400
parents e3afd1303184
children b0d41ff5e0df
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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.Id;
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12 import dmd.SymOffExp;
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13 import dmd.FuncDeclaration;
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14 import dmd.VarDeclaration;
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15 import dmd.backend.OPER;
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16 import dmd.backend.TYM;
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17 import dmd.backend.mTY;
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18 import dmd.backend.SC;
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19 import dmd.backend.elem;
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20 import dmd.backend.Symbol;
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21 import dmd.backend.Util;
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22 import dmd.codegen.Util;
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23
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24 version(DMDV2)
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25 class SymbolExp : Expression
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26 {
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27 Declaration var;
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28
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29 bool hasOverloads;
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30
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31 this(Loc loc, TOK op, int size, Declaration var, bool hasOverloads)
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32 {
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33 register();
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34 super(loc, op, size);
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35 assert(var);
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36 this.var = var;
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37 this.hasOverloads = hasOverloads;
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38 }
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39
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40 override elem* toElem(IRState* irs)
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41 {
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42 Symbol* s;
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43 elem* e;
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44 tym_t tym;
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45 Type tb = (op == TOK.TOKsymoff) ? var.type.toBasetype() : type.toBasetype();
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46 int offset = (op == TOK.TOKsymoff) ? (cast(SymOffExp)this).offset : 0;
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47 FuncDeclaration fd;
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48 VarDeclaration v = var.isVarDeclaration();
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49
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50 //printf("SymbolExp::toElem('%s') %p\n", toChars(), this);
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51 //printf("\tparent = '%s'\n", var.parent ? var.parent.toChars() : "null");
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52 if (op == TOK.TOKvar && var.needThis())
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53 {
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54 error("need 'this' to access member %s", toChars());
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55 return el_long(TYM.TYint, 0);
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56 }
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57
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58 /* The magic variable __ctfe is always false at runtime
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59 */
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60 if (op == TOKvar && v && v.ident == Id.ctfe)
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61 return el_long(type.totym(), 0);
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62
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63 s = var.toSymbol();
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64 fd = null;
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65 if (var.toParent2())
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66 fd = var.toParent2().isFuncDeclaration();
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67
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68 int nrvo = 0;
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69 if (fd && fd.nrvo_can && fd.nrvo_var == var)
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70 {
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71 s = fd.shidden;
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72 nrvo = 1;
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73 }
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74
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75 if (s.Sclass == SC.SCauto || s.Sclass == SC.SCparameter)
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76 {
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77 if (fd && fd != irs.getFunc())
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78 {
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79 // 'var' is a variable in an enclosing function.
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80 elem* ethis;
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81 int soffset;
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82
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83 ethis = getEthis(loc, irs, fd);
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84 ethis = el_una(OPER.OPaddr, TYM.TYnptr, ethis);
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85
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86 if (v && v.offset)
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87 soffset = v.offset;
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88 else
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89 {
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90 soffset = s.Soffset;
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91 /* If fd is a non-static member function of a class or struct,
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92 * then ethis isn't the frame pointer.
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93 * ethis is the 'this' pointer to the class/struct instance.
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94 * We must offset it.
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95 */
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96 if (fd.vthis)
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97 {
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98 soffset -= fd.vthis.toSymbol().Soffset;
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99 }
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100 //printf("\tSoffset = x%x, sthis.Soffset = x%x\n", s.Soffset, irs.sthis.Soffset);
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101 }
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102
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103 if (!nrvo)
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104 soffset += offset;
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105
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106 e = el_bin(OPER.OPadd, TYM.TYnptr, ethis, el_long(TYM.TYnptr, soffset));
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107
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108 if (op == TOK.TOKvar)
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109 e = el_una(OPER.OPind, TYM.TYnptr, e);
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110 if (ISREF(var, tb))
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111 e = el_una(OPER.OPind, s.ty(), e);
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112 else if (op == TOK.TOKsymoff && nrvo)
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113 {
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114 e = el_una(OPER.OPind, TYM.TYnptr, e);
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115 e = el_bin(OPER.OPadd, e.Ety, e, el_long(TYM.TYint, offset));
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116 }
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117 goto L1;
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118 }
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119 }
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120
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121 /* If var is a member of a closure
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122 */
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123 if (v && v.offset)
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124 {
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125 assert(irs.sclosure);
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126 e = el_var(irs.sclosure);
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127 e = el_bin(OPER.OPadd, TYM.TYnptr, e, el_long(TYM.TYint, v.offset));
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128 if (op == TOK.TOKvar)
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129 {
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130 e = el_una(OPER.OPind, type.totym(), e);
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131 if (tybasic(e.Ety) == TYM.TYstruct)
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132 e.Enumbytes = cast(uint)type.size();
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133 el_setLoc(e, loc);
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134 }
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135 if (ISREF(var, tb))
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136 {
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137 e.Ety = TYM.TYnptr;
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138 e = el_una(OPER.OPind, s.ty(), e);
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139 }
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140 else if (op == TOK.TOKsymoff && nrvo)
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141 { e = el_una(OPER.OPind, TYM.TYnptr, e);
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142 e = el_bin(OPER.OPadd, e.Ety, e, el_long(TYM.TYint, offset));
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143 }
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144 else if (op == TOK.TOKsymoff)
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145 {
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146 e = el_bin(OPER.OPadd, e.Ety, e, el_long(TYM.TYint, offset));
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147 }
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148 goto L1;
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149 }
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150
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151 if (s.Sclass == SC.SCauto && s.Ssymnum == -1)
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152 {
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153 //printf("\tadding symbol\n");
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154 symbol_add(s);
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155 }
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156
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157 if (var.isImportedSymbol())
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158 {
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159 assert(op == TOK.TOKvar);
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160 e = el_var(var.toImport());
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161 e = el_una(OPER.OPind,s.ty(),e);
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162 }
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163 else if (ISREF(var, tb))
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164 {
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165 // Static arrays are really passed as pointers to the array
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166 // Out parameters are really references
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167 e = el_var(s);
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168 e.Ety = TYM.TYnptr;
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169 if (op == TOK.TOKvar)
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170 e = el_una(OPER.OPind, s.ty(), e);
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171 else if (offset)
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172 e = el_bin(OPER.OPadd, TYM.TYnptr, e, el_long(TYM.TYint, offset));
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173 }
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174 else if (op == TOK.TOKvar)
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175 e = el_var(s);
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176 else
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177 {
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178 e = nrvo ? el_var(s) : el_ptr(s);
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179 e = el_bin(OPER.OPadd, e.Ety, e, el_long(TYM.TYint, offset));
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180 }
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181 L1:
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182 if (op == TOK.TOKvar)
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183 {
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184 if (nrvo)
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185 {
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186 e.Ety = TYM.TYnptr;
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187 e = el_una(OPER.OPind, 0, e);
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188 }
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189 if (tb.ty == TY.Tfunction)
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190 {
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191 tym = s.Stype.Tty;
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192 }
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193 else
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194 tym = type.totym();
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195 e.Ejty = cast(ubyte)tym;
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196 e.Ety = e.Ejty;
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197 if (tybasic(tym) == TYM.TYstruct)
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198 {
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199 e.Enumbytes = cast(uint)type.size();
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200 }
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201 else if (tybasic(tym) == TYM.TYarray)
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202 {
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203 e.Ejty = TYM.TYstruct;
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204 e.Ety = e.Ejty;
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205 e.Enumbytes = cast(uint)type.size();
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206 }
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207 }
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208 el_setLoc(e,loc);
0
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209 return e;
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210 }
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211 }
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212