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1 module dmd.StructLiteralExp;
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2
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3 import dmd.Expression;
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63
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4 import dmd.expression.Util;
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5 import dmd.ErrorExp;
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6 import dmd.Dsymbol;
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7 import dmd.VarDeclaration;
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0
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8 import dmd.StructDeclaration;
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9 import dmd.backend.elem;
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10 import dmd.InterState;
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11 import dmd.MATCH;
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56
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12 import dmd.WANT;
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63
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13 import dmd.TY;
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0
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14 import dmd.Type;
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15 import dmd.OutBuffer;
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16 import dmd.Loc;
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17 import dmd.Scope;
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18 import dmd.InlineCostState;
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19 import dmd.IRState;
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20 import dmd.InlineDoState;
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21 import dmd.backend.Symbol;
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22 import dmd.HdrGenState;
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23 import dmd.backend.dt_t;
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24 import dmd.InlineScanState;
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25 import dmd.ArrayTypes;
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26 import dmd.TOK;
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27
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28
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29 class StructLiteralExp : Expression
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30 {
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31 StructDeclaration sd; // which aggregate this is for
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32 Expressions elements; // parallels sd->fields[] with
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33 // NULL entries for fields to skip
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34
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35 Symbol* sym; // back end symbol to initialize with literal
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36 size_t soffset; // offset from start of s
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37 int fillHoles; // fill alignment 'holes' with zero
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38
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39 this(Loc loc, StructDeclaration sd, Expressions elements)
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40 {
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41 super(loc, TOKstructliteral, StructLiteralExp.sizeof);
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42 this.sd = sd;
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43 this.elements = elements;
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44 this.sym = null;
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45 this.soffset = 0;
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46 this.fillHoles = 1;
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0
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47 }
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48
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49 Expression syntaxCopy()
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50 {
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51 assert(false);
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52 }
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53
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54 Expression semantic(Scope sc)
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55 {
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56 Expression e;
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57 int nfields = sd.fields.dim - sd.isnested;
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58
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59 version (LOGSEMANTIC) {
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60 printf("StructLiteralExp.semantic('%s')\n", toChars());
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61 }
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62 if (type)
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63 return this;
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64
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65 // Run semantic() on each element
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66 for (size_t i = 0; i < elements.dim; i++)
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67 {
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68 e = cast(Expression)elements.data[i];
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69 if (!e)
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70 continue;
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71 e = e.semantic(sc);
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72 elements.data[i] = cast(void*)e;
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73 }
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74 expandTuples(elements);
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75 size_t offset = 0;
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76 for (size_t i = 0; i < elements.dim; i++)
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77 {
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78 e = cast(Expression)elements.data[i];
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79 if (!e)
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80 continue;
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81
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82 if (!e.type)
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83 error("%s has no value", e.toChars());
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84 e = resolveProperties(sc, e);
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85 if (i >= nfields)
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86 {
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87 error("more initializers than fields of %s", sd.toChars());
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88 return new ErrorExp();
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89 }
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90 Dsymbol s = cast(Dsymbol)sd.fields.data[i];
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91 VarDeclaration v = s.isVarDeclaration();
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92 assert(v);
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93 if (v.offset < offset)
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94 error("overlapping initialization for %s", v.toChars());
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95 offset = v.offset + cast(uint)v.type.size();
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96
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97 Type telem = v.type;
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98 while (!e.implicitConvTo(telem) && telem.toBasetype().ty == Tsarray)
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99 {
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100 /* Static array initialization, as in:
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101 * T[3][5] = e;
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102 */
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103 telem = telem.toBasetype().nextOf();
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104 }
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105
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106 e = e.implicitCastTo(sc, telem);
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107
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108 elements.data[i] = cast(void*)e;
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109 }
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110
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111 /* Fill out remainder of elements[] with default initializers for fields[]
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112 */
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113 for (size_t i = elements.dim; i < nfields; i++)
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114 {
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115 Dsymbol s = cast(Dsymbol)sd.fields.data[i];
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116 VarDeclaration v = s.isVarDeclaration();
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117 assert(v);
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118 assert(!v.isThisDeclaration());
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119
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120 if (v.offset < offset)
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121 {
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122 e = null;
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123 sd.hasUnions = 1;
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124 }
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125 else
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126 {
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127 if (v.init)
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128 {
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129 e = v.init.toExpression();
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130 if (!e)
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131 error("cannot make expression out of initializer for %s", v.toChars());
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132 }
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133 else
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134 {
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135 e = v.type.defaultInit(Loc(0));
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136 e.loc = loc;
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137 }
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138 offset = v.offset + cast(uint)v.type.size();
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139 }
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140 elements.push(cast(void*)e);
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141 }
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142
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143 type = sd.type;
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144 return this;
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0
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145 }
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146
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147 Expression getField(Type type, uint offset)
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148 {
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149 assert(false);
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150 }
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151
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152 int getFieldIndex(Type type, uint offset)
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153 {
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154 assert(false);
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155 }
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156
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157 elem* toElem(IRState* irs)
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158 {
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159 assert(false);
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160 }
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161
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162 bool checkSideEffect(int flag)
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163 {
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164 assert(false);
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165 }
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166
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167 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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168 {
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169 assert(false);
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170 }
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171
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172 void toMangleBuffer(OutBuffer buf)
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173 {
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174 assert(false);
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175 }
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176
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177 void scanForNestedRef(Scope sc)
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178 {
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179 assert(false);
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180 }
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181
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182 Expression optimize(int result)
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183 {
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56
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184 if (elements)
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185 {
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186 for (size_t i = 0; i < elements.dim; i++)
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187 {
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188 Expression e = cast(Expression)elements.data[i];
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189 if (!e)
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190 continue;
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191 e = e.optimize(WANTvalue | (result & WANTinterpret));
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192 elements.data[i] = cast(void*)e;
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193 }
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194 }
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195 return this;
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0
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196 }
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197
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198 Expression interpret(InterState istate)
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199 {
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200 assert(false);
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201 }
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202
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203 dt_t** toDt(dt_t** pdt)
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204 {
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205 assert(false);
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206 }
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207
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208 int isLvalue()
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209 {
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210 assert(false);
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211 }
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212
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213 Expression toLvalue(Scope sc, Expression e)
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214 {
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215 assert(false);
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216 }
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217
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218 bool canThrow()
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219 {
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220 assert(false);
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221 }
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222
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223 MATCH implicitConvTo(Type t)
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224 {
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225 assert(false);
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226 }
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227
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228 int inlineCost(InlineCostState* ics)
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229 {
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230 assert(false);
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231 }
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232
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233 Expression doInline(InlineDoState ids)
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234 {
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235 assert(false);
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236 }
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237
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238 Expression inlineScan(InlineScanState* iss)
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239 {
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240 assert(false);
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241 }
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242 }
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243
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