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1 module dmd.OnScopeStatement;
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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.OutBuffer;
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6 import dmd.HdrGenState;
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7 import dmd.Scope;
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8 import dmd.IRState;
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9 import dmd.TOK;
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10 import dmd.Loc;
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11 import dmd.BE;
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12 import dmd.Identifier;
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13 import dmd.ExpInitializer;
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14 import dmd.IntegerExp;
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15 import dmd.VarDeclaration;
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16 import dmd.Type;
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17 import dmd.AssignExp;
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18 import dmd.VarExp;
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19 import dmd.NotExp;
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20 import dmd.IfStatement;
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21 import dmd.DeclarationStatement;
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22 import dmd.ExpStatement;
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23 import dmd.Expression;
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24 import dmd.Lexer;
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25
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26 class OnScopeStatement : Statement
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27 {
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28 TOK tok;
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29 Statement statement;
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30
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31 this(Loc loc, TOK tok, Statement statement)
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32 {
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33 super(loc);
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34
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35 this.tok = tok;
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36 this.statement = statement;
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37 }
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38
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72
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39 override Statement syntaxCopy()
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40 {
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41 OnScopeStatement s = new OnScopeStatement(loc,
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42 tok, statement.syntaxCopy());
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43 return s;
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44 }
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45
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72
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46 override BE blockExit()
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47 {
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48 // At this point, this statement is just an empty placeholder
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49 return BE.BEfallthru;
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50 }
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51
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72
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52 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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53 {
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54 assert(false);
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55 }
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56
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72
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57 override Statement semantic(Scope sc)
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58 {
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59 /* semantic is called on results of scopeCode() */
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60 return this;
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61 }
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62
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72
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63 override bool usesEH()
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64 {
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65 assert(false);
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66 }
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67
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68 override void scopeCode(Scope sc, Statement* sentry, Statement* sexception, Statement* sfinally)
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69 {
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70 //printf("OnScopeStatement::scopeCode()\n");
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71 //print();
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72 *sentry = null;
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73 *sexception = null;
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74 *sfinally = null;
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75 switch (tok)
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76 {
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77 case TOKon_scope_exit:
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78 *sfinally = statement;
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79 break;
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80
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81 case TOKon_scope_failure:
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82 *sexception = statement;
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83 break;
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84
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85 case TOKon_scope_success:
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86 {
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87 /* Create:
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88 * sentry: int x = 0;
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89 * sexception: x = 1;
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90 * sfinally: if (!x) statement;
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91 */
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92 Identifier id = Lexer.uniqueId("__os");
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93
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94 ExpInitializer ie = new ExpInitializer(loc, new IntegerExp(0));
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95 VarDeclaration v = new VarDeclaration(loc, Type.tint32, id, ie);
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96 *sentry = new DeclarationStatement(loc, v);
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97
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98 Expression e = new IntegerExp(1);
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99 e = new AssignExp(Loc(0), new VarExp(Loc(0), v), e);
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100 *sexception = new ExpStatement(Loc(0), e);
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101
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102 e = new VarExp(Loc(0), v);
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103 e = new NotExp(Loc(0), e);
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104 *sfinally = new IfStatement(Loc(0), null, e, statement, null);
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105
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106 break;
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107 }
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108
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109 default:
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110 assert(0);
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111 }
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112 }
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113
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72
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114 override void toIR(IRState* irs)
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0
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115 {
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116 }
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72
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117 }
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