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1 module dmd.DoStatement;
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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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6 import dmd.Loc;
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7 import dmd.Scope;
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8 import dmd.InterState;
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155
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9 import dmd.GlobalExpressions;
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0
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10 import dmd.HdrGenState;
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11 import dmd.OutBuffer;
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12 import dmd.InlineScanState;
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13 import dmd.IRState;
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14 import dmd.BE;
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15 import dmd.WANT;
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16
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17 import dmd.backend.block;
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18 import dmd.backend.Blockx;
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19 import dmd.backend.Util;
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20 import dmd.backend.BC;
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21
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22 class DoStatement : Statement
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23 {
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24 Statement body_;
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25 Expression condition;
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26
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27 this(Loc loc, Statement b, Expression c)
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28 {
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178
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29 register();
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0
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30 super(loc);
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31 body_ = b;
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32 condition = c;
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33 }
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34
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72
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35 override Statement syntaxCopy()
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36 {
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37 DoStatement s = new DoStatement(loc, body_ ? body_.syntaxCopy() : null, condition.syntaxCopy());
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38 return s;
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39 }
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40
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72
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41 override Statement semantic(Scope sc)
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42 {
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43 sc.noctor++;
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44 if (body_)
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45 body_ = body_.semanticScope(sc, this, this);
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46 sc.noctor--;
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47 condition = condition.semantic(sc);
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48 condition = resolveProperties(sc, condition);
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49 condition = condition.optimize(WANTvalue);
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50
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51 condition = condition.checkToBoolean();
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52
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53 return this;
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54 }
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55
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72
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56 override bool hasBreak()
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0
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57 {
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58 return true;
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59 }
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60
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72
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61 override bool hasContinue()
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0
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62 {
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63 return true;
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64 }
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65
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72
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66 override bool usesEH()
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67 {
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68 return body_ ? body_.usesEH() : false;
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69 }
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70
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72
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71 override BE blockExit()
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72 {
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73 BE result;
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74
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75 if (body_)
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76 {
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77 result = body_.blockExit();
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78 if (result == BE.BEbreak)
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79 return BE.BEfallthru;
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80 if (result & BE.BEcontinue)
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81 result |= BE.BEfallthru;
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82 }
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83 else
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84 result = BE.BEfallthru;
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85
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86 if (result & BE.BEfallthru)
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87 {
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88 if (condition.canThrow())
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89 result |= BE.BEthrow;
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90 if (!(result & BE.BEbreak) && condition.isBool(true))
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91 result &= ~BE.BEfallthru;
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92 }
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93 result &= ~(BE.BEbreak | BE.BEcontinue);
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94
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95 return result;
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96 }
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97
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72
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98 override bool comeFrom()
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99 {
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100 assert(false);
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101 }
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102
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72
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103 override Expression interpret(InterState istate)
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104 {
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155
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105 version(LOG)
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106 writef("DoStatement::interpret()\n");
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107
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108 if (istate.start == this)
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109 istate.start = null;
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110 Expression e;
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111
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112 if (istate.start)
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113 {
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114 e = body_ ? body_.interpret(istate) : null;
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115 if (istate.start)
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116 return null;
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117 if (e is EXP_CANT_INTERPRET)
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118 return e;
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119 if (e is EXP_BREAK_INTERPRET)
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120 return null;
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121 if (e is EXP_CONTINUE_INTERPRET)
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122 goto Lcontinue;
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123 if (e)
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124 return e;
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125 }
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126
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127 while (1)
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128 {
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129 e = body_ ? body_.interpret(istate) : null;
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130 if (e is EXP_CANT_INTERPRET)
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131 break;
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132 if (e is EXP_BREAK_INTERPRET)
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133 {
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134 e = null;
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135 break;
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136 }
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137 if (e && e !is EXP_CONTINUE_INTERPRET)
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138 break;
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139
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140 Lcontinue:
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141 e = condition.interpret(istate);
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142 if (e is EXP_CANT_INTERPRET)
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143 break;
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144 if (!e.isConst())
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145 {
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146 e = EXP_CANT_INTERPRET;
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147 break;
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148 }
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149 if (e.isBool(true))
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150 {
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151 }
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152 else if (e.isBool(false))
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153 {
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154 e = null;
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155 break;
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156 }
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157 else
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158 assert(0);
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159 }
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160 return e;
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0
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161 }
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162
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72
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163 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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0
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164 {
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174
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165 buf.writestring("do");
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166 buf.writenl();
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167 if (body_)
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168 body_.toCBuffer(buf, hgs);
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169 buf.writestring("while (");
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170 condition.toCBuffer(buf, hgs);
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171 buf.writebyte(')');
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172 }
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173
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72
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174 override Statement inlineScan(InlineScanState* iss)
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0
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175 {
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176 body_ = body_ ? body_.inlineScan(iss) : null;
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177 condition = condition.inlineScan(iss);
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178 return this;
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179 }
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180
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72
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181 override void toIR(IRState* irs)
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0
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182 {
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183 Blockx *blx = irs.blx;
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184
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185 IRState mystate = IRState(irs,this);
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186 mystate.breakBlock = block_calloc(blx);
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187 mystate.contBlock = block_calloc(blx);
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188
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189 block* bpre = blx.curblock;
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190 block_next(blx, BCgoto, null);
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191 list_append(&bpre.Bsucc, blx.curblock);
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192
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193 list_append(&mystate.contBlock.Bsucc, blx.curblock);
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194 list_append(&mystate.contBlock.Bsucc, mystate.breakBlock);
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195
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196 if (body_)
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197 body_.toIR(&mystate);
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198 list_append(&blx.curblock.Bsucc, mystate.contBlock);
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199
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200 block_next(blx, BCgoto, mystate.contBlock);
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201 incUsage(irs, condition.loc);
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202 block_appendexp(mystate.contBlock, condition.toElem(&mystate));
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203 block_next(blx, BCiftrue, mystate.breakBlock);
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204 }
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72
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205 }
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