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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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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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9 import dmd.HdrGenState;
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10 import dmd.OutBuffer;
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11 import dmd.InlineScanState;
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12 import dmd.IRState;
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13 import dmd.BE;
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14 import dmd.WANT;
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15
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16 import dmd.backend.block;
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17 import dmd.backend.Blockx;
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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 DoStatement : Statement
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22 {
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23 Statement body_;
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24 Expression condition;
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25
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26 this(Loc loc, Statement b, Expression c)
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27 {
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28 super(loc);
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29 body_ = b;
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30 condition = c;
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31 }
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32
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33 override Statement syntaxCopy()
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34 {
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35 DoStatement s = new DoStatement(loc, body_ ? body_.syntaxCopy() : null, condition.syntaxCopy());
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36 return s;
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37 }
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38
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39 override Statement semantic(Scope sc)
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40 {
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41 sc.noctor++;
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42 if (body_)
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43 body_ = body_.semanticScope(sc, this, this);
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44 sc.noctor--;
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45 condition = condition.semantic(sc);
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46 condition = resolveProperties(sc, condition);
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47 condition = condition.optimize(WANTvalue);
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48
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49 condition = condition.checkToBoolean();
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50
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51 return this;
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52 }
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53
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54 override bool hasBreak()
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55 {
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56 return true;
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57 }
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58
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59 override bool hasContinue()
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60 {
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61 return true;
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62 }
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63
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64 override bool usesEH()
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65 {
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66 return body_ ? body_.usesEH() : false;
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67 }
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68
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69 override BE blockExit()
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70 {
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71 BE result;
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72
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73 if (body_)
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74 {
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75 result = body_.blockExit();
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76 if (result == BE.BEbreak)
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77 return BE.BEfallthru;
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78 if (result & BE.BEcontinue)
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79 result |= BE.BEfallthru;
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80 }
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81 else
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82 result = BE.BEfallthru;
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83
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84 if (result & BE.BEfallthru)
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85 {
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86 if (condition.canThrow())
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87 result |= BE.BEthrow;
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88 if (!(result & BE.BEbreak) && condition.isBool(true))
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89 result &= ~BE.BEfallthru;
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90 }
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91 result &= ~(BE.BEbreak | BE.BEcontinue);
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92
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93 return result;
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94 }
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95
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96 override bool comeFrom()
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97 {
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98 assert(false);
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99 }
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100
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101 override Expression interpret(InterState istate)
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102 {
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103 assert(false);
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104 }
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105
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106 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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107 {
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108 assert(false);
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109 }
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110
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111 override Statement inlineScan(InlineScanState* iss)
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112 {
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113 body_ = body_ ? body_.inlineScan(iss) : null;
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114 condition = condition.inlineScan(iss);
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115 return this;
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116 }
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117
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118 override void toIR(IRState* irs)
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119 {
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120 Blockx *blx = irs.blx;
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121
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122 IRState mystate = IRState(irs,this);
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123 mystate.breakBlock = block_calloc(blx);
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124 mystate.contBlock = block_calloc(blx);
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125
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126 block* bpre = blx.curblock;
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127 block_next(blx, BCgoto, null);
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128 list_append(&bpre.Bsucc, blx.curblock);
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129
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130 list_append(&mystate.contBlock.Bsucc, blx.curblock);
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131 list_append(&mystate.contBlock.Bsucc, mystate.breakBlock);
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132
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133 if (body_)
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134 body_.toIR(&mystate);
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135 list_append(&blx.curblock.Bsucc, mystate.contBlock);
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136
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137 block_next(blx, BCgoto, mystate.contBlock);
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138 incUsage(irs, condition.loc);
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139 block_appendexp(mystate.contBlock, condition.toElem(&mystate));
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140 block_next(blx, BCiftrue, mystate.breakBlock);
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141 }
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72
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142 }
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