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annotate dmd/ForeachRangeStatement.d @ 130:60bb0fe4563e

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dmdfe 2.037 first main iteration
author Eldar Insafutdinov <e.insafutdinov@gmail.com>
date Thu, 09 Sep 2010 22:51:44 +0100
parents c77e9f4f1793
children e3afd1303184
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1 module dmd.ForeachRangeStatement;
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2
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3 import dmd.common;
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4 import dmd.Statement;
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5 import dmd.TOK;
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6 import dmd.Token;
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7 import dmd.Parameter;
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8 import dmd.Expression;
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9 import dmd.Statement;
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10 import dmd.VarDeclaration;
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11 import dmd.Scope;
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12 import dmd.ExpInitializer;
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13 import dmd.Identifier;
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14 import dmd.Lexer;
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15 import dmd.ArrayTypes;
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16 import dmd.DeclarationStatement;
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17 import dmd.CompoundDeclarationStatement;
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18 import dmd.DeclarationExp;
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19 import dmd.PostExp;
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20 import dmd.VarExp;
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21 import dmd.ForStatement;
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22 import dmd.IntegerExp;
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23 import dmd.AddAssignExp;
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24 import dmd.CmpExp;
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25 import dmd.IRState;
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26 import dmd.InterState;
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27 import dmd.OutBuffer;
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28 import dmd.AddExp;
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29 import dmd.WANT;
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30 import dmd.ScopeDsymbol;
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31 import dmd.HdrGenState;
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32 import dmd.InlineScanState;
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33 import dmd.Loc;
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34 import dmd.BE;
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35
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36 version(DMDV2)
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37 class ForeachRangeStatement : Statement
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38 {
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39 TOK op; // TOK.TOKforeach or TOK.TOKforeach_reverse
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40 Parameter arg; // loop index variable
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41 Expression lwr;
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42 Expression upr;
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43 Statement body_;
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44
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45 VarDeclaration key = null;
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46
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47 this(Loc loc, TOK op, Parameter arg, Expression lwr, Expression upr, Statement body_)
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48 {
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49 super(loc);
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50 this.op = op;
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51 this.arg = arg;
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52 this.lwr = lwr;
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53 this.upr = upr;
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54 this.body_ = body_;
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55 }
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56
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57 override Statement syntaxCopy()
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58 {
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59 ForeachRangeStatement s = new ForeachRangeStatement(loc, op,
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60 arg.syntaxCopy(),
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61 lwr.syntaxCopy(),
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62 upr.syntaxCopy(),
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63 body_ ? body_.syntaxCopy() : null);
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64
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65 return s;
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66 }
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67
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68 override Statement semantic(Scope sc)
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69 {
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70 //printf("ForeachRangeStatement.semantic() %p\n", this);
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71 ScopeDsymbol sym;
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72 Statement s = this;
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73
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74 lwr = lwr.semantic(sc);
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75 lwr = resolveProperties(sc, lwr);
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76 lwr = lwr.optimize(WANTvalue);
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77 if (!lwr.type)
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78 {
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79 error("invalid range lower bound %s", lwr.toChars());
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80 return this;
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81 }
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82
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83 upr = upr.semantic(sc);
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84 upr = resolveProperties(sc, upr);
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85 upr = upr.optimize(WANTvalue);
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86 if (!upr.type)
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87 {
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88 error("invalid range upper bound %s", upr.toChars());
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89 return this;
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90 }
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91
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92 if (arg.type)
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93 {
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94 arg.type = arg.type.semantic(loc, sc);
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95 lwr = lwr.implicitCastTo(sc, arg.type);
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96 upr = upr.implicitCastTo(sc, arg.type);
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97 }
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98 else
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99 {
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100 /* Must infer types from lwr and upr
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101 */
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102 scope AddExp ea = new AddExp(loc, lwr, upr);
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103 ea.typeCombine(sc);
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104 arg.type = ea.type.mutableOf();
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105 lwr = ea.e1;
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106 upr = ea.e2;
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107 }
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108 static if (true) {
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109 /* Convert to a for loop:
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110 * foreach (key; lwr .. upr) =>
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111 * for (auto key = lwr, auto tmp = upr; key < tmp; ++key)
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112 *
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113 * foreach_reverse (key; lwr .. upr) =>
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114 * for (auto tmp = lwr, auto key = upr; key-- > tmp;)
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115 */
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116
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117 ExpInitializer ie = new ExpInitializer(loc, (op == TOKforeach) ? lwr : upr);
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118 key = new VarDeclaration(loc, arg.type, arg.ident, ie);
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119
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120 Identifier id = Lexer.uniqueId("__limit");
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121 ie = new ExpInitializer(loc, (op == TOKforeach) ? upr : lwr);
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122 VarDeclaration tmp = new VarDeclaration(loc, arg.type, id, ie);
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123
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124 auto cs = new Statements();
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125 // Keep order of evaluation as lwr, then upr
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126 if (op == TOKforeach)
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127 {
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128 cs.push(new DeclarationStatement(loc, new DeclarationExp(loc, key)));
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129 cs.push(new DeclarationStatement(loc, new DeclarationExp(loc, tmp)));
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130 }
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131 else
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132 {
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133 cs.push(new DeclarationStatement(loc, new DeclarationExp(loc, tmp)));
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134 cs.push(new DeclarationStatement(loc, new DeclarationExp(loc, key)));
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135 }
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136 Statement forinit = new CompoundDeclarationStatement(loc, cs);
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137
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138 Expression cond;
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139 if (op == TOKforeach_reverse)
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140 { // key-- > tmp
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141 cond = new PostExp(TOKminusminus, loc, new VarExp(loc, key));
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142 cond = new CmpExp(TOKgt, loc, cond, new VarExp(loc, tmp));
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143 }
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144 else
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145 // key < tmp
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146 cond = new CmpExp(TOKlt, loc, new VarExp(loc, key), new VarExp(loc, tmp));
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147
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148 Expression increment = null;
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149 if (op == TOKforeach)
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150 // key += 1
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151 increment = new AddAssignExp(loc, new VarExp(loc, key), new IntegerExp(1));
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152
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153 ForStatement fs = new ForStatement(loc, forinit, cond, increment, body_);
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154 s = fs.semantic(sc);
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155 return s;
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156 } else {
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157 if (!arg.type.isscalar())
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158 error("%s is not a scalar type", arg.type.toChars());
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159
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160 sym = new ScopeDsymbol();
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161 sym.parent = sc.scopesym;
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162 sc = sc.push(sym);
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163
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164 sc.noctor++;
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165
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166 key = new VarDeclaration(loc, arg.type, arg.ident, null);
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167 DeclarationExp de = new DeclarationExp(loc, key);
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168 de.semantic(sc);
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169
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170 if (key.storage_class)
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171 error("foreach range: key cannot have storage class");
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172
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173 sc.sbreak = this;
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174 sc.scontinue = this;
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175 body_ = body_.semantic(sc);
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176
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177 sc.noctor--;
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178 sc.pop();
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179 return s;
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180 }
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181 }
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182
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183 override bool hasBreak()
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184 {
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185 return true;
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186 }
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187
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188 override bool hasContinue()
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189 {
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190 return true;
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191 }
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192
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193 override bool usesEH()
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194 {
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195 assert(false); // from dmd
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196 return body_.usesEH();
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197 }
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198
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199 override BE blockExit()
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200 {
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201 assert(false); // from dmd
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202 BE result = BE.BEfallthru;
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203
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204 if (lwr && lwr.canThrow())
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205 result |= BE.BEthrow;
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206 else if (upr && upr.canThrow())
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207 result |= BE.BEthrow;
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208
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209 if (body_)
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210 {
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211 result |= body_.blockExit() & ~(BE.BEbreak | BE.BEcontinue);
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212 }
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213 return result;
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214 }
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215
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216 override bool comeFrom()
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217 {
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218 assert(false); // from dmd
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219 if (body_)
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220 return body_.comeFrom();
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221 return false;
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222 }
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223
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224 override Expression interpret(InterState istate)
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225 {
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226 assert(false);
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227 }
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228
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229 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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230 {
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231 buf.writestring(Token.toChars(op));
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232 buf.writestring(" (");
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233
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234 if (arg.type)
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235 arg.type.toCBuffer(buf, arg.ident, hgs);
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236 else
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237 buf.writestring(arg.ident.toChars());
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238
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239 buf.writestring("; ");
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240 lwr.toCBuffer(buf, hgs);
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241 buf.writestring(" .. ");
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242 upr.toCBuffer(buf, hgs);
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243 buf.writebyte(')');
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244 buf.writenl();
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245 buf.writebyte('{');
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246 buf.writenl();
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247 if (body_)
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248 body_.toCBuffer(buf, hgs);
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249 buf.writebyte('}');
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250 buf.writenl();
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251 }
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252
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253 override Statement inlineScan(InlineScanState* iss)
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254 {
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255 lwr = lwr.inlineScan(iss);
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256 upr = upr.inlineScan(iss);
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257 if (body_)
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258 body_ = body_.inlineScan(iss);
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259 return this;
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260 }
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261
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262 override void toIR(IRState* irs)
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263 {
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264 assert(false);
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265 }
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266 }