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1 module dmd.OnScopeStatement;
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2
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3 import dmd.Statement;
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4 import dmd.OutBuffer;
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5 import dmd.HdrGenState;
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6 import dmd.Scope;
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7 import dmd.IRState;
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8 import dmd.TOK;
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9 import dmd.Loc;
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10 import dmd.BE;
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11 import dmd.Identifier;
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12 import dmd.ExpInitializer;
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13 import dmd.IntegerExp;
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14 import dmd.VarDeclaration;
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15 import dmd.Type;
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16 import dmd.AssignExp;
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17 import dmd.VarExp;
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18 import dmd.NotExp;
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19 import dmd.IfStatement;
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20 import dmd.DeclarationStatement;
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21 import dmd.ExpStatement;
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22 import dmd.Expression;
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23 import dmd.Lexer;
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24
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25 class OnScopeStatement : Statement
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26 {
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27 TOK tok;
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28 Statement statement;
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29
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30 this(Loc loc, TOK tok, Statement statement)
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31 {
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32 super(loc);
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33
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34 this.tok = tok;
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35 this.statement = statement;
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36 }
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37
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38 Statement syntaxCopy()
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39 {
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40 OnScopeStatement s = new OnScopeStatement(loc,
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41 tok, statement.syntaxCopy());
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42 return s;
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0
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43 }
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44
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45 BE blockExit()
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46 {
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47 // At this point, this statement is just an empty placeholder
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48 return BE.BEfallthru;
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49 }
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50
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51 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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52 {
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53 assert(false);
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54 }
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55
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56 Statement semantic(Scope sc)
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57 {
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58 /* semantic is called on results of scopeCode() */
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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 assert(false);
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65 }
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66
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67 void scopeCode(Scope sc, Statement* sentry, Statement* sexception, Statement* sfinally)
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68 {
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69 //printf("OnScopeStatement::scopeCode()\n");
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70 //print();
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71 *sentry = null;
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72 *sexception = null;
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73 *sfinally = null;
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74 switch (tok)
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75 {
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76 case TOKon_scope_exit:
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77 *sfinally = statement;
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78 break;
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79
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80 case TOKon_scope_failure:
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81 *sexception = statement;
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82 break;
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83
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84 case TOKon_scope_success:
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85 {
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86 /* Create:
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87 * sentry: int x = 0;
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88 * sexception: x = 1;
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89 * sfinally: if (!x) statement;
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90 */
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91 Identifier id = Lexer.uniqueId("__os");
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92
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93 ExpInitializer ie = new ExpInitializer(loc, new IntegerExp(0));
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94 VarDeclaration v = new VarDeclaration(loc, Type.tint32, id, ie);
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95 *sentry = new DeclarationStatement(loc, v);
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96
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97 Expression e = new IntegerExp(1);
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98 e = new AssignExp(Loc(0), new VarExp(Loc(0), v), e);
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99 *sexception = new ExpStatement(Loc(0), e);
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100
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101 e = new VarExp(Loc(0), v);
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102 e = new NotExp(Loc(0), e);
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103 *sfinally = new IfStatement(Loc(0), null, e, statement, null);
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104
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105 break;
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106 }
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107
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108 default:
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109 assert(0);
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110 }
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111 }
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112
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113 void toIR(IRState* irs)
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114 {
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115 }
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116 } |
