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