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1 module dmd.DefaultStatement;
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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.Loc;
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6 import dmd.Scope;
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7 import dmd.Expression;
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8 import dmd.InterState;
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9 import dmd.OutBuffer;
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10 import dmd.HdrGenState;
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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
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15 import dmd.backend.Util;
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16 import dmd.backend.OPER;
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17 import dmd.backend.Blockx;
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18 import dmd.backend.block;
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19 import dmd.backend.BC;
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20
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21 class DefaultStatement : Statement
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22 {
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23 Statement statement;
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24 version (IN_GCC) {
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25 block* cblock = null; // back end: label for the block
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26 }
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27
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28 this(Loc loc, Statement s)
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29 {
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30 super(loc);
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31 this.statement = s;
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32 }
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33
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34 override Statement syntaxCopy()
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35 {
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36 DefaultStatement s = new DefaultStatement(loc, statement.syntaxCopy());
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37 return s;
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38 }
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39
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40 override Statement semantic(Scope sc)
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41 {
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42 //printf("DefaultStatement.semantic()\n");
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43 if (sc.sw)
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44 {
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45 if (sc.sw.sdefault)
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46 {
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47 error("switch statement already has a default");
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48 }
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49 sc.sw.sdefault = this;
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50
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51 if (sc.sw.tf !is sc.tf)
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52 error("switch and default are in different finally blocks");
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53
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54 if (sc.sw.isFinal)
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55 error("default statement not allowed in final switch statement");
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56 }
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57 else
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58 error("default not in switch statement");
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59 statement = statement.semantic(sc);
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60 return this;
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61 }
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62
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63 override bool usesEH()
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64 {
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64
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65 return statement.usesEH();
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66 }
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67
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68 override BE blockExit()
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69 {
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70 return statement.blockExit();
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71 }
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72
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73 override bool comeFrom()
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74 {
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75 return true;
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76 }
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77
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78 override Expression interpret(InterState istate)
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79 {
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80 assert(false);
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81 }
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82
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83 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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84 {
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85 buf.writestring("default:\n");
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86 statement.toCBuffer(buf, hgs);
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87 }
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88
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89 override Statement inlineScan(InlineScanState* iss)
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90 {
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91 if (statement)
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92 statement = statement.inlineScan(iss);
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93 return this;
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94 }
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95
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96 override void toIR(IRState* irs)
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97 {
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98 Blockx* blx = irs.blx;
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99 block* bcase = blx.curblock;
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100 block* bdefault = irs.getDefaultBlock();
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101 block_next(blx,BCgoto,bdefault);
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102 list_append(&bcase.Bsucc,blx.curblock);
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103 if (blx.tryblock != irs.getSwitchBlock().Btry)
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104 error("default cannot be in different try block level from switch");
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105 incUsage(irs, loc);
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106 if (statement)
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107 statement.toIR(irs);
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108 }
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72
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109 }
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