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1 module dmd.DefaultStatement;
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2
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3 import dmd.Statement;
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4 import dmd.Loc;
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5 import dmd.Scope;
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6 import dmd.Expression;
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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.IRState;
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12 import dmd.BE;
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13
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14 import dmd.backend.Util;
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15 import dmd.backend.OPER;
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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.BC;
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19
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20 class DefaultStatement : Statement
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21 {
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22 Statement statement;
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23 version (IN_GCC) {
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24 block* cblock = null; // back end: label for the block
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25 }
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26
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27 this(Loc loc, Statement s)
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28 {
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29 super(loc);
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30 this.statement = s;
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31 }
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32
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33 Statement syntaxCopy()
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34 {
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35 DefaultStatement s = new DefaultStatement(loc, statement.syntaxCopy());
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36 return s;
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37 }
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38
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39 Statement semantic(Scope sc)
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40 {
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41 //printf("DefaultStatement.semantic()\n");
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42 if (sc.sw)
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43 {
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44 if (sc.sw.sdefault)
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45 {
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46 error("switch statement already has a default");
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47 }
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48 sc.sw.sdefault = this;
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49
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50 if (sc.sw.tf !is sc.tf)
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51 error("switch and default are in different finally blocks");
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52
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53 if (sc.sw.isFinal)
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54 error("default statement not allowed in final switch statement");
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55 }
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56 else
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57 error("default not in switch statement");
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58 statement = statement.semantic(sc);
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59 return this;
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60 }
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61
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62 bool usesEH()
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63 {
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64
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64 return statement.usesEH();
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65 }
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66
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67 BE blockExit()
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68 {
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69 return statement.blockExit();
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70 }
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71
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72 bool comeFrom()
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73 {
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74 return true;
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75 }
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76
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77 Expression interpret(InterState istate)
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78 {
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79 assert(false);
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80 }
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81
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82 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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83 {
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84 buf.writestring("default:\n");
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85 statement.toCBuffer(buf, hgs);
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86 }
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87
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88 Statement inlineScan(InlineScanState* iss)
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89 {
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90 if (statement)
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91 statement = statement.inlineScan(iss);
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92 return this;
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93 }
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94
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95 void toIR(IRState* irs)
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96 {
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97 Blockx* blx = irs.blx;
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98 block* bcase = blx.curblock;
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99 block* bdefault = irs.getDefaultBlock();
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100 block_next(blx,BCgoto,bdefault);
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101 list_append(&bcase.Bsucc,blx.curblock);
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102 if (blx.tryblock != irs.getSwitchBlock().Btry)
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103 error("default cannot be in different try block level from switch");
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104 incUsage(irs, loc);
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105 if (statement)
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106 statement.toIR(irs);
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107 }
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108 } |
