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annotate ast/Exp.d @ 60:2451f0904bf6 new_gen

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Dumping Ast with AstPrinter is now possible again! :)
author Anders Johnsen <skabet@gmail.com>
date Tue, 29 Apr 2008 15:00:11 +0200
parents 1d6f4ad38a91
children 78a6808b2e0f 9f8131676242
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1 module ast.Exp;
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2
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3 import tango.text.Util : jhash;
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4 import tango.io.Stdout;
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6 import ast.Decl,
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7 ast.Stmt;
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8
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9 import lexer.Token;
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10
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11 import sema.SymbolTable,
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12 sema.DType;
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13
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14 enum ExpType
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15 {
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16 Binary,
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17 Negate,
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18 IntegerLit,
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19 MemberReference,
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20 ArrayLookup,
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21 Identifier,
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22 AssignExp,
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23 CallExp,
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24 }
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25
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26 class Exp
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27 {
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28 this(ExpType expType)
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29 {
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30 this.expType = expType;
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31 }
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32
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33 DType type() { return null; }
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34
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35 ExpType expType;
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36 Scope env;
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37 int stmtIndex;
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39 Exp simplify()
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40 {
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41 return this;
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42 }
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43 }
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44
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45 class CallExp : Exp
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46 {
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47 this(Exp exp, Exp[] args)
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48 {
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49 super(ExpType.CallExp);
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50 this.exp = exp;
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51 this.args = args;
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52 }
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53
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54 override DType type()
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55 {
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56 DFunction f = cast(DFunction)exp.type();
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57 assert(f !is null, "Can only call functions");
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58 return f.return_type;
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59 }
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60
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61 Exp exp;
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62 Exp[] args;
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63 bool sret = false;
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66 Exp simplify()
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67 {
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68 if(auto t = cast(DStruct)type)
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69 {
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70 DFunction func_t = cast(DFunction)exp.type();
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71 assert(func_t !is null, "Calling on something that isn't a function");
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72 if (cast(DStruct)func_t.return_type is null)
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73 return this;
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74
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75 auto call = cast(Identifier)exp;
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76 FuncDecl f = env.parentFunction;
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77 auto i = new Identifier("temp.var");
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78 i.env = f.env;
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79 f.env.add(i);
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80 f.env.find(i).type = t;
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81 auto var = new VarDecl(new Identifier(t.name), i, null);
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82 Exp[] args;
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83 args ~= i;
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84 args ~= this.args;
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85 auto callExp = new CallExp(exp, args);
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86 callExp.env = f.env;
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87 // auto ass = new AssignExp(i, callExp);
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88 var.env = f.env;
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89 // ass.env = f.env;
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90 auto stmtVar = new DeclStmt(var);
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91 auto stmtCall = new ExpStmt(callExp);
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92 Stmt[] stmts;
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93 foreach( index, s ; f.statements)
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94 {
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95 if(stmtIndex == index)
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96 {
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97 stmts ~= stmtVar;
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98 stmts ~= stmtCall;
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99 }
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100 stmts ~= s;
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101 }
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102 f.statements = stmts;
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103 callExp.sret = true;
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104
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105 return i;
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106 }
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107 return this;
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108 }
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109 }
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110
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111 class AssignExp : Exp
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112 {
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113 this(Exp identifier, Exp exp)
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114 {
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115 super(ExpType.AssignExp);
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116 this.identifier = identifier;
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117 this.exp = exp;
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118 }
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119 Exp simplify()
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120 {
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121 identifier = identifier.simplify;
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122 exp = exp.simplify;
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124 return this;
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125 }
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126
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127 override DType type() { return identifier.type(); }
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128
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129 Exp identifier;
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130 Exp exp;
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131 }
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132
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133 class BinaryExp : Exp
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134 {
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135 public enum Operator
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136 {
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137 Assign,
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138
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139 Eq, Ne,
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140
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141 Lt, Le,
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142 Gt, Ge,
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143
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144 Add, Sub,
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145 Mul, Div, Mod,
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146 }
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147
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148 this(Operator op, Exp left, Exp right)
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149 {
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150 super(ExpType.Binary);
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151 this.op = op;
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152 this.left = left;
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153 this.right = right;
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154 }
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155
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156 override DType type()
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157 {
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158 if (myType)
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159 return myType;
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160
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161 DType l = left.type;
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162 DType r = right.type;
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163 if (l is r)
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164 myType = l;
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165 else if (l.hasImplicitConversionTo(r))
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166 myType = r;
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167 else if (r.hasImplicitConversionTo(l))
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168 myType = l;
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169 else
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170 return null;
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171 }
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172
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173 char[] resultType()
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174 {
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175 if (op >= Operator.Eq && op <= Operator.Ge)
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176 return "bool";
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177 return null;
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178 }
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179 Exp simplify()
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180 {
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181 left = left.simplify;
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182 right = right.simplify;
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183 return this;
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184 }
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185
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186 Operator op;
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187 Exp left, right;
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188 private DType myType;
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189 }
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190
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191 class NegateExp : Exp
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192 {
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193 this(Exp exp)
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194 {
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195 super(ExpType.Negate);
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196 this.exp = exp;
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197 }
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198 Exp simplify()
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199 {
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200 exp = exp.simplify;
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201 return this;
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202 }
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203
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204 override DType type() { return exp.type(); }
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205
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206 public Exp exp;
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207 }
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208
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209 class IntegerLit : Exp
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210 {
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211 this(Token t)
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212 {
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213 super(ExpType.IntegerLit);
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214 this.token = t;
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215 }
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216 Exp simplify()
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217 {
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218 return this;
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219 }
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220
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221 override DType type() { return DType.Int; }
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222
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223 Token token;
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224 }
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225
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226 class MemberReference : Exp
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227 {
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228 this(Exp target, Identifier child)
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229 {
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230 super(ExpType.MemberReference);
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231 this.target = target;
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232 this.child = child;
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233 }
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234 Exp simplify()
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235 {
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236 target = target.simplify;
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237 return this;
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238 }
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239
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240 override DType type()
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241 {
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242 if (myType)
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243 return myType;
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244
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245 DStruct st = cast(DStruct)target.type;
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246 assert(st, "Only structs have members");
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247 if (auto t = st.typeOf(child.token.get))
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248 myType = t;
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249 // no error reporting here
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250 else assert(0, "Referencing non-existant member");
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251 }
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252
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253 Identifier child;
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254 Exp target;
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255 private DType myType;
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256 }
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257
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258 class ArrayLookup : Exp
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259 {
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260 this(Exp target, IntegerLit pos)
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261 {
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262 super(ExpType.ArrayLookup);
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263 this.target = target;
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264 this.pos = pos;
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265 }
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266
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267 override DType type() { return target.type(); }
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268
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269 Exp simplify()
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270 {
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271 target = target.simplify;
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272 pos.simplify;
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273 return this;
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274 }
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275
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276 Exp target;
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277 IntegerLit pos;
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278 }
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279
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280 class Identifier : Exp
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281 {
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282 this(Token t)
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283 {
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284 super(ExpType.Identifier);
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285 this.token = t;
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286 name = t.get;
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287 }
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288
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289 override DType type()
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290 {
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291 if (myType !is null)
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292 return myType;
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293 myType = env.find(this).type;
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294 return myType;
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295 }
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296
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297 this(char[] name)
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298 {
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299 super(ExpType.Identifier);
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300 this.name = name;
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301 }
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302
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303 char[] get()
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304 {
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305 return name;
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306 }
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307
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308 hash_t toHash()
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309 {
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310 return jhash(name);
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311 }
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312
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313 int opCmp(Object o)
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314 {
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315 if (auto id = cast(Identifier)o)
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316 return typeid(char[]).compare(&name, &id.name);
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317 return 0;
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318 }
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319
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320 int opEquals(Object o)
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321 {
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322 if (auto id = cast(Identifier)o)
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323 return typeid(char[]).equals(&name, &id.name);
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324 return 0;
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325 }
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326
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327 Exp simplify()
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328 {
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329 return this;
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330 }
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331
1
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332 Token token;
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333 char[] name;
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334 private DType myType;
1
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335 }
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336