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1 module dmd.Catch;
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2
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114
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3 import dmd.common;
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0
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4 import dmd.Loc;
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5 import dmd.Type;
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6 import dmd.Scope;
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7 import dmd.Identifier;
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8 import dmd.VarDeclaration;
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9 import dmd.Statement;
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10 import dmd.OutBuffer;
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11 import dmd.Id;
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12 import dmd.TypeIdentifier;
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13 import dmd.Util;
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14 import dmd.ScopeDsymbol;
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15 import dmd.HdrGenState;
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16 import dmd.BE;
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17
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178
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18 import dmd.TObject;
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19
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20 class Catch : TObject
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0
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21 {
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22 Loc loc;
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23 Type type;
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24 Identifier ident;
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25 VarDeclaration var = null;
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26 Statement handler;
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27
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28 this(Loc loc, Type t, Identifier id, Statement handler)
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29 {
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178
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30 register();
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31
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0
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32 //printf("Catch(%s, loc = %s)\n", id.toChars(), loc.toChars());
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33 this.loc = loc;
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34 this.type = t;
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35 this.ident = id;
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36 this.handler = handler;
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37 }
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38
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39 Catch syntaxCopy()
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40 {
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63
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41 Catch c = new Catch(loc, (type ? type.syntaxCopy() : null), ident, (handler ? handler.syntaxCopy() : null));
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42 return c;
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0
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43 }
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44
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45 void semantic(Scope sc)
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46 {
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47 ScopeDsymbol sym;
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48
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49 //printf("Catch.semantic(%s)\n", ident.toChars());
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50
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51 version (IN_GCC) {
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52 } else {
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53 if (sc.tf)
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54 {
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55 /* This is because the _d_local_unwind() gets the stack munged
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56 * up on this. The workaround is to place any try-catches into
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57 * a separate function, and call that.
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58 * To fix, have the compiler automatically convert the finally
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59 * body into a nested function.
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60 */
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61 error(loc, "cannot put catch statement inside finally block");
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62 }
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63 }
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64
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65 sym = new ScopeDsymbol();
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66 sym.parent = sc.scopesym;
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67 sc = sc.push(sym);
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68
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69 if (!type)
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70 type = new TypeIdentifier(Loc(0), Id.Object_);
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71 type = type.semantic(loc, sc);
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72 if (!type.toBasetype().isClassHandle())
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73 error("can only catch class objects, not '%s'", type.toChars());
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74 else if (ident)
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75 {
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76 var = new VarDeclaration(loc, type, ident, null);
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77 var.parent = sc.parent;
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78 sc.insert(var);
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79 }
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80 handler = handler.semantic(sc);
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81
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82 sc.pop();
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83 }
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84
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85 BE blockExit()
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86 {
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87 return handler ? handler.blockExit() : BE.BEfallthru;
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88 }
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89
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90 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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91 {
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174
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92 buf.writestring("catch");
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93 if (type)
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94 {
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95 buf.writebyte('(');
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96 type.toCBuffer(buf, ident, hgs);
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97 buf.writebyte(')');
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98 }
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99 buf.writenl();
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100 buf.writebyte('{');
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101 buf.writenl();
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102 if (handler)
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103 handler.toCBuffer(buf, hgs);
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104 buf.writebyte('}');
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105 buf.writenl();
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106 }
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107 } |
