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1 module dmd.GotoCaseStatement;
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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.CaseStatement;
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7 import dmd.IRState;
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8 import dmd.Scope;
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9 import dmd.Loc;
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10 import dmd.InterState;
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11 import dmd.OutBuffer;
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12 import dmd.HdrGenState;
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13 import dmd.BE;
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64
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14 import dmd.WANT;
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15
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123
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16 import dmd.backend.Util;
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17 import dmd.backend.block;
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18 import dmd.backend.BC;
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19 import dmd.backend.Blockx;
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20
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21 class GotoCaseStatement : Statement
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22 {
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23 Expression exp; // NULL, or which case to goto
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24 CaseStatement cs; // case statement it resolves to
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25
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26 this(Loc loc, Expression exp)
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27 {
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28 register();
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29 super(loc);
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30 cs = null;
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31 this.exp = exp;
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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 Expression e = exp ? exp.syntaxCopy() : null;
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37 GotoCaseStatement s = new GotoCaseStatement(loc, e);
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38 return s;
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39 }
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40
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41 override Statement semantic(Scope sc)
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42 {
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43 if (exp)
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44 exp = exp.semantic(sc);
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45
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46 if (!sc.sw)
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47 error("goto case not in switch statement");
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48 else
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49 {
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50 sc.sw.gotoCases.push(cast(void*)this);
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51 if (exp)
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52 {
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53 exp = exp.implicitCastTo(sc, sc.sw.condition.type);
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54 exp = exp.optimize(WANTvalue);
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55 }
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56 }
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57 return this;
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58 }
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59
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60 override Expression interpret(InterState istate)
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61 {
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62 assert(false);
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63 }
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64
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65 override BE blockExit()
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66 {
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67 return BEgoto;
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68 }
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69
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70 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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71 {
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72 buf.writestring("goto case");
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73 if (exp)
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74 {
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75 buf.writebyte(' ');
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76 exp.toCBuffer(buf, hgs);
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77 }
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78 buf.writebyte(';');
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79 buf.writenl();
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80 }
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81
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82 override void toIR(IRState* irs)
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83 {
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84 block* b;
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85 Blockx* blx = irs.blx;
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86 block* bdest = cs.cblock;
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87
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88 if (!bdest)
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89 {
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90 bdest = block_calloc(blx);
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91 cs.cblock = bdest;
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92 }
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93
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94 b = blx.curblock;
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95
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96 // The rest is equivalent to GotoStatement
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97
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98 // Adjust exception handler scope index if in different try blocks
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99 if (b.Btry != bdest.Btry)
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100 {
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101 // Check that bdest is in an enclosing try block
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102 for (block* bt = b.Btry; bt != bdest.Btry; bt = bt.Btry)
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103 {
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104 if (!bt)
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105 {
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106 //printf("b.Btry = %p, bdest.Btry = %p\n", b.Btry, bdest.Btry);
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107 error("cannot goto into try block");
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108 break;
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109 }
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110 }
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111
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112 //setScopeIndex(blx, b, bdest.Btry ? bdest.Btry.Bscope_index : -1);
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113 }
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114
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115 list_append(&b.Bsucc,bdest);
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116 incUsage(irs, loc);
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117 block_next(blx, BC.BCgoto, null);
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118 }
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119 }
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