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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 assert(false);
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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 //printf("DefaultStatement.semantic()\n");
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41 if (sc.sw)
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42 {
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43 if (sc.sw.sdefault)
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44 {
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45 error("switch statement already has a default");
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46 }
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47 sc.sw.sdefault = this;
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48
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49 if (sc.sw.tf !is sc.tf)
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50 error("switch and default are in different finally blocks");
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51
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52 if (sc.sw.isFinal)
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53 error("default statement not allowed in final switch statement");
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54 }
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55 else
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56 error("default not in switch statement");
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57 statement = statement.semantic(sc);
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58 return this;
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59 }
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60
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61 bool usesEH()
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62 {
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63 assert(false);
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64 }
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65
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66 BE blockExit()
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67 {
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68 return statement.blockExit();
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69 }
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70
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71 bool comeFrom()
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72 {
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73 return true;
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74 }
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75
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76 Expression interpret(InterState* istate)
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77 {
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78 assert(false);
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79 }
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80
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81 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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82 {
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83 assert(false);
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84 }
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85
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86 Statement inlineScan(InlineScanState* iss)
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87 {
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88 if (statement)
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89 statement = statement.inlineScan(iss);
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90 return this;
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91 }
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92
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93 void toIR(IRState* irs)
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94 {
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95 Blockx* blx = irs.blx;
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96 block* bcase = blx.curblock;
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97 block* bdefault = irs.getDefaultBlock();
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98 block_next(blx,BCgoto,bdefault);
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99 list_append(&bcase.Bsucc,blx.curblock);
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100 if (blx.tryblock != irs.getSwitchBlock().Btry)
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101 error("default cannot be in different try block level from switch");
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102 incUsage(irs, loc);
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103 if (statement)
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104 statement.toIR(irs);
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105 }
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106 } |
