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1 module dmd.ForStatement;
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2
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114
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3 import dmd.common;
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0
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4 import dmd.Statement;
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5 import dmd.Expression;
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123
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6 import dmd.GlobalExpressions;
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0
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7 import dmd.Loc;
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8 import dmd.Scope;
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9 import dmd.InterState;
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10 import dmd.OutBuffer;
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11 import dmd.HdrGenState;
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12 import dmd.InlineScanState;
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13 import dmd.WANT;
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14 import dmd.ScopeDsymbol;
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15 import dmd.IRState;
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16 import dmd.BE;
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17
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18 import dmd.backend.Blockx;
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19 import dmd.backend.block;
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20 import dmd.backend.Util;
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21 import dmd.backend.BC;
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22
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23 class ForStatement : Statement
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24 {
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25 Statement init;
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26 Expression condition;
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27 Expression increment;
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28 Statement body_;
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29
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30 this(Loc loc, Statement init, Expression condition, Expression increment, Statement body_)
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31 {
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32 super(loc);
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33
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34 this.init = init;
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35 this.condition = condition;
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36 this.increment = increment;
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37 this.body_ = body_;
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38 }
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39
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72
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40 override Statement syntaxCopy()
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0
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41 {
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42 Statement i = null;
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43 if (init)
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44 i = init.syntaxCopy();
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45 Expression c = null;
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46 if (condition)
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47 c = condition.syntaxCopy();
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48 Expression inc = null;
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49 if (increment)
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50 inc = increment.syntaxCopy();
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51 ForStatement s = new ForStatement(loc, i, c, inc, body_.syntaxCopy());
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52 return s;
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53 }
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54
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72
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55 override Statement semantic(Scope sc)
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0
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56 {
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57 ScopeDsymbol sym = new ScopeDsymbol();
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58 sym.parent = sc.scopesym;
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59 sc = sc.push(sym);
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60 if (init)
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61 init = init.semantic(sc);
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62 sc.noctor++;
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63 if (condition)
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64 {
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65 condition = condition.semantic(sc);
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66 condition = resolveProperties(sc, condition);
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67 condition = condition.optimize(WANTvalue);
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68 condition = condition.checkToBoolean();
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69 }
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70 if (increment)
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71 {
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72 increment = increment.semantic(sc);
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73 increment = resolveProperties(sc, increment);
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79
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74 increment = increment.optimize(0);
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0
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75 }
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76
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77 sc.sbreak = this;
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78 sc.scontinue = this;
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79 if (body_)
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80 body_ = body_.semantic(sc);
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81 sc.noctor--;
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82
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83 sc.pop();
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84 return this;
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85 }
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86
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87 override void scopeCode(Scope sc, Statement* sentry, Statement* sexception, Statement* sfinally)
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0
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88 {
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89 //printf("ForStatement::scopeCode()\n");
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90 //print();
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91 if (init)
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92 init.scopeCode(sc, sentry, sexception, sfinally);
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93 else
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94 Statement.scopeCode(sc, sentry, sexception, sfinally);
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95 }
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96
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72
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97 override bool hasBreak()
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98 {
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99 //printf("ForStatement.hasBreak()\n");
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100 return true;
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101 }
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102
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72
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103 override bool hasContinue()
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104 {
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105 return true;
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106 }
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107
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72
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108 override bool usesEH()
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109 {
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110 return (init && init.usesEH()) || body_.usesEH();
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111 }
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112
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72
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113 override BE blockExit()
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114 {
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115 BE result = BE.BEfallthru;
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116
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117 if (init)
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118 {
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119 result = init.blockExit();
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120 if (!(result & BE.BEfallthru))
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121 return result;
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122 }
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123 if (condition)
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124 {
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125 if (condition.canThrow())
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126 result |= BE.BEthrow;
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127 if (condition.isBool(true))
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128 result &= ~BE.BEfallthru;
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129 else if (condition.isBool(false))
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130 return result;
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131 }
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132 else
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133 result &= ~BE.BEfallthru; // the body must do the exiting
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134 if (body_)
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135 {
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136 int r = body_.blockExit();
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137 if (r & (BE.BEbreak | BE.BEgoto))
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138 result |= BE.BEfallthru;
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139 result |= r & ~(BE.BEfallthru | BE.BEbreak | BE.BEcontinue);
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140 }
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141 if (increment && increment.canThrow())
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142 result |= BE.BEthrow;
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143 return result;
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144 }
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145
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72
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146 override bool comeFrom()
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0
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147 {
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148 //printf("ForStatement.comeFrom()\n");
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149 if (body_)
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150 {
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151 bool result = body_.comeFrom();
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152 //printf("result = %d\n", result);
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153 return result;
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154 }
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155 return false;
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156 }
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157
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72
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158 override Expression interpret(InterState istate)
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159 {
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160 version (LOG) {
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161 printf("ForStatement.interpret()\n");
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162 }
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163 if (istate.start == this)
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164 istate.start = null;
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165
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166 Expression e;
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167
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168 if (init)
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169 {
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170 e = init.interpret(istate);
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171 if (e is EXP_CANT_INTERPRET)
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172 return e;
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173 assert(!e);
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174 }
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175
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176 if (istate.start)
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177 {
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178 e = body_ ? body_.interpret(istate) : null;
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179 if (istate.start)
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180 return null;
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181 if (e is EXP_CANT_INTERPRET)
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182 return e;
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183 if (e is EXP_BREAK_INTERPRET)
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184 return null;
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185 if (e is EXP_CONTINUE_INTERPRET)
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186 goto Lcontinue;
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187 if (e)
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188 return e;
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189 }
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190
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191 while (true)
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192 {
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193 if (!condition)
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194 goto Lhead;
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195 e = condition.interpret(istate);
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196 if (e is EXP_CANT_INTERPRET)
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197 break;
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198 if (!e.isConst())
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199 {
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200 e = EXP_CANT_INTERPRET;
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201 break;
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202 }
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203 if (e.isBool(true))
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204 {
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205 Lhead:
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206 e = body_ ? body_.interpret(istate) : null;
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207 if (e is EXP_CANT_INTERPRET)
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208 break;
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209 if (e is EXP_BREAK_INTERPRET)
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210 {
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211 e = null;
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212 break;
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213 }
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214 if (e && e !is EXP_CONTINUE_INTERPRET)
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215 break;
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216 Lcontinue:
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217 if (increment)
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218 {
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219 e = increment.interpret(istate);
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220 if (e is EXP_CANT_INTERPRET)
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221 break;
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222 }
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223 }
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224 else if (e.isBool(false))
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225 {
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226 e = null;
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227 break;
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228 }
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229 else
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230 assert(0);
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231 }
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232 return e;
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233 }
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234
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235 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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236 {
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237 buf.writestring("for (");
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238 if (init)
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239 {
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240 hgs.FLinit.init++;
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241 init.toCBuffer(buf, hgs);
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242 hgs.FLinit.init--;
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243 }
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244 else
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245 buf.writebyte(';');
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246 if (condition)
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247 { buf.writebyte(' ');
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248 condition.toCBuffer(buf, hgs);
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249 }
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250 buf.writebyte(';');
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251 if (increment)
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252 {
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253 buf.writebyte(' ');
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254 increment.toCBuffer(buf, hgs);
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255 }
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256 buf.writebyte(')');
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257 buf.writenl();
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258 buf.writebyte('{');
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259 buf.writenl();
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260 body_.toCBuffer(buf, hgs);
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261 buf.writebyte('}');
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262 buf.writenl();
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263 }
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264
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265 override Statement inlineScan(InlineScanState* iss)
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266 {
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267 if (init)
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268 init = init.inlineScan(iss);
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269 if (condition)
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270 condition = condition.inlineScan(iss);
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271 if (increment)
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272 increment = increment.inlineScan(iss);
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273 if (body_)
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274 body_ = body_.inlineScan(iss);
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275 return this;
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276 }
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277
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278 override void toIR(IRState* irs)
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279 {
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280 Blockx* blx = irs.blx;
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281
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282 IRState mystate = IRState(irs,this);
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283 mystate.breakBlock = block_calloc(blx);
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284 mystate.contBlock = block_calloc(blx);
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285
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286 if (init)
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287 init.toIR(&mystate);
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288 block* bpre = blx.curblock;
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289 block_next(blx,BCgoto,null);
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290 block* bcond = blx.curblock;
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291 list_append(&bpre.Bsucc, bcond);
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292 list_append(&mystate.contBlock.Bsucc, bcond);
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293 if (condition)
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294 {
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295 incUsage(irs, condition.loc);
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296 block_appendexp(bcond, condition.toElem(&mystate));
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297 block_next(blx,BCiftrue,null);
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298 list_append(&bcond.Bsucc, blx.curblock);
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299 list_append(&bcond.Bsucc, mystate.breakBlock);
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300 }
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301 else
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302 {
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303 /* No conditional, it's a straight goto
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304 */
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305 block_next(blx,BCgoto,null);
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306 list_append(&bcond.Bsucc, blx.curblock);
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307 }
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308
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309 if (body_)
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310 body_.toIR(&mystate);
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311 /* End of the body goes to the continue block
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312 */
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313 list_append(&blx.curblock.Bsucc, mystate.contBlock);
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314 block_next(blx, BCgoto, mystate.contBlock);
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315
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316 if (increment)
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317 {
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318 incUsage(irs, increment.loc);
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319 block_appendexp(mystate.contBlock, increment.toElem(&mystate));
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320 }
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321
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322 /* The 'break' block follows the for statement.
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323 */
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324 block_next(blx,BCgoto, mystate.breakBlock);
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325 }
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72
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326 }
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