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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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174
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14 import dmd.Token;
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0
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15 import dmd.IntegerExp;
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16 import dmd.VarDeclaration;
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17 import dmd.Type;
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18 import dmd.AssignExp;
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19 import dmd.VarExp;
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20 import dmd.NotExp;
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21 import dmd.IfStatement;
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22 import dmd.DeclarationStatement;
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23 import dmd.ExpStatement;
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24 import dmd.Expression;
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25 import dmd.Lexer;
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26
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27 class OnScopeStatement : Statement
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28 {
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29 TOK tok;
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30 Statement statement;
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31
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32 this(Loc loc, TOK tok, Statement statement)
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33 {
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34 super(loc);
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174
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35
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36 this.tok = tok;
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37 this.statement = statement;
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38 }
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39
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72
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40 override Statement syntaxCopy()
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41 {
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61
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42 OnScopeStatement s = new OnScopeStatement(loc,
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43 tok, statement.syntaxCopy());
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44 return s;
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0
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45 }
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46
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72
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47 override BE blockExit()
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48 {
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49 // At this point, this statement is just an empty placeholder
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50 return BE.BEfallthru;
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51 }
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52
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72
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53 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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54 {
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174
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55 buf.writestring(Token.toChars(tok));
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56 buf.writebyte(' ');
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57 statement.toCBuffer(buf, hgs);
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58 }
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59
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72
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60 override Statement semantic(Scope sc)
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61 {
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62 /* semantic is called on results of scopeCode() */
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63 return this;
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64 }
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65
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72
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66 override bool usesEH()
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67 {
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68 assert(false);
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69 }
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70
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72
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71 override void scopeCode(Scope sc, Statement* sentry, Statement* sexception, Statement* sfinally)
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72 {
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73 //printf("OnScopeStatement::scopeCode()\n");
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74 //print();
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75 *sentry = null;
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76 *sexception = null;
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77 *sfinally = null;
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78 switch (tok)
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79 {
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80 case TOKon_scope_exit:
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81 *sfinally = statement;
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82 break;
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83
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84 case TOKon_scope_failure:
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85 *sexception = statement;
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86 break;
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87
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88 case TOKon_scope_success:
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89 {
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90 /* Create:
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91 * sentry: int x = 0;
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92 * sexception: x = 1;
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93 * sfinally: if (!x) statement;
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94 */
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95 Identifier id = Lexer.uniqueId("__os");
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96
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97 ExpInitializer ie = new ExpInitializer(loc, new IntegerExp(0));
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98 VarDeclaration v = new VarDeclaration(loc, Type.tint32, id, ie);
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99 *sentry = new DeclarationStatement(loc, v);
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100
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101 Expression e = new IntegerExp(1);
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102 e = new AssignExp(Loc(0), new VarExp(Loc(0), v), e);
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103 *sexception = new ExpStatement(Loc(0), e);
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104
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105 e = new VarExp(Loc(0), v);
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106 e = new NotExp(Loc(0), e);
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107 *sfinally = new IfStatement(Loc(0), null, e, statement, null);
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108
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109 break;
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110 }
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111
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112 default:
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113 assert(0);
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114 }
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115 }
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116
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72
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117 override void toIR(IRState* irs)
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0
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118 {
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119 }
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72
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120 }
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