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1 module dmd.DoStatement;
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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.HdrGenState;
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9 import dmd.OutBuffer;
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10 import dmd.InlineScanState;
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11 import dmd.IRState;
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12 import dmd.BE;
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13 import dmd.WANT;
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14
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15 import dmd.backend.block;
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16 import dmd.backend.Blockx;
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17 import dmd.backend.Util;
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18 import dmd.backend.BC;
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19
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20 class DoStatement : Statement
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21 {
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22 Statement body_;
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23 Expression condition;
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24
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25 this(Loc loc, Statement b, Expression c)
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26 {
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27 super(loc);
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28 body_ = b;
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29 condition = c;
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30 }
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31
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32 Statement syntaxCopy()
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33 {
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34 DoStatement s = new DoStatement(loc, body_ ? body_.syntaxCopy() : null, condition.syntaxCopy());
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35 return s;
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36 }
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37
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38 Statement semantic(Scope sc)
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39 {
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40 sc.noctor++;
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41 if (body_)
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42 body_ = body_.semanticScope(sc, this, this);
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43 sc.noctor--;
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44 condition = condition.semantic(sc);
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45 condition = resolveProperties(sc, condition);
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46 condition = condition.optimize(WANTvalue);
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47
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48 condition = condition.checkToBoolean();
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49
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50 return this;
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51 }
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52
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53 bool hasBreak()
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54 {
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55 return true;
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56 }
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57
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58 bool hasContinue()
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59 {
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60 return true;
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61 }
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62
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63 bool usesEH()
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64 {
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65 return body_ ? body_.usesEH() : false;
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66 }
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67
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68 BE blockExit()
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69 {
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70 BE result;
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71
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72 if (body_)
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73 {
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74 result = body_.blockExit();
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75 if (result == BE.BEbreak)
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76 return BE.BEfallthru;
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77 if (result & BE.BEcontinue)
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78 result |= BE.BEfallthru;
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79 }
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80 else
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81 result = BE.BEfallthru;
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82
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83 if (result & BE.BEfallthru)
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84 {
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85 if (condition.canThrow())
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86 result |= BE.BEthrow;
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87 if (!(result & BE.BEbreak) && condition.isBool(true))
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88 result &= ~BE.BEfallthru;
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89 }
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90 result &= ~(BE.BEbreak | BE.BEcontinue);
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91
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92 return result;
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93 }
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94
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95 bool comeFrom()
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96 {
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97 assert(false);
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98 }
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99
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63
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100 Expression interpret(InterState istate)
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0
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101 {
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102 assert(false);
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103 }
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104
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105 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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106 {
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107 assert(false);
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108 }
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109
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110 Statement inlineScan(InlineScanState* iss)
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111 {
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112 body_ = body_ ? body_.inlineScan(iss) : null;
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113 condition = condition.inlineScan(iss);
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114 return this;
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115 }
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116
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117 void toIR(IRState* irs)
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118 {
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119 Blockx *blx = irs.blx;
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120
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121 IRState mystate = IRState(irs,this);
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122 mystate.breakBlock = block_calloc(blx);
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123 mystate.contBlock = block_calloc(blx);
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124
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125 block* bpre = blx.curblock;
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126 block_next(blx, BCgoto, null);
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127 list_append(&bpre.Bsucc, blx.curblock);
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128
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129 list_append(&mystate.contBlock.Bsucc, blx.curblock);
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130 list_append(&mystate.contBlock.Bsucc, mystate.breakBlock);
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131
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132 if (body_)
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133 body_.toIR(&mystate);
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134 list_append(&blx.curblock.Bsucc, mystate.contBlock);
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135
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136 block_next(blx, BCgoto, mystate.contBlock);
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137 incUsage(irs, condition.loc);
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138 block_appendexp(mystate.contBlock, condition.toElem(&mystate));
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139 block_next(blx, BCiftrue, mystate.breakBlock);
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140 }
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141 } |
