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1 module dmd.DeclarationStatement;
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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.Loc;
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5 import dmd.ExpStatement;
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6 import dmd.Dsymbol;
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7 import dmd.Expression;
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8 import dmd.Statement;
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9 import dmd.OutBuffer;
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10 import dmd.HdrGenState;
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11 import dmd.Scope;
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12 import dmd.DeclarationExp;
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13 import dmd.TOK;
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14 import dmd.VarDeclaration;
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15
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16 class DeclarationStatement : ExpStatement
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17 {
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18 // Doing declarations as an expression, rather than a statement,
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19 // makes inlining functions much easier.
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20
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21 this(Loc loc, Dsymbol declaration)
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22 {
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23 super(loc, new DeclarationExp(loc, declaration));
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24 }
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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 super(loc, exp);
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29 }
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30
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72
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31 override Statement syntaxCopy()
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32 {
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33 DeclarationStatement ds = new DeclarationStatement(loc, exp.syntaxCopy());
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34 return ds;
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35 }
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36
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72
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37 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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38 {
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39 exp.toCBuffer(buf, hgs);
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40 }
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41
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72
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42 override void scopeCode(Scope sc, Statement* sentry, Statement* sexception, Statement* sfinally)
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43 {
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44 //printf("DeclarationStatement.scopeCode()\n");
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45 //print();
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46
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47 *sentry = null;
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48 *sexception = null;
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49 *sfinally = null;
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50
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51 if (exp)
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52 {
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53 if (exp.op == TOK.TOKdeclaration)
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54 {
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55 DeclarationExp de = cast(DeclarationExp)exp;
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56 VarDeclaration v = de.declaration.isVarDeclaration();
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57 if (v)
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58 {
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59 Expression e;
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60
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61 e = v.callAutoDtor(sc);
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62 if (e)
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63 {
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64 //printf("dtor is: "); e.print();
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65 static if (false) {
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66 if (v.type.toBasetype().ty == Tstruct)
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67 {
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68 /* Need a 'gate' to turn on/off destruction,
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69 * in case v gets moved elsewhere.
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70 */
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71 Identifier id = Lexer.uniqueId("__runDtor");
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72 ExpInitializer ie = new ExpInitializer(loc, new IntegerExp(1));
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73 VarDeclaration rd = new VarDeclaration(loc, Type.tint32, id, ie);
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74 *sentry = new DeclarationStatement(loc, rd);
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75 v.rundtor = rd;
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76
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77 /* Rewrite e as:
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78 * rundtor && e
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79 */
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80 Expression ve = new VarExp(loc, v.rundtor);
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81 e = new AndAndExp(loc, ve, e);
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82 e.type = Type.tbool;
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83 }
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84 }
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85 *sfinally = new ExpStatement(loc, e);
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86 }
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87 }
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88 }
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89 }
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90 }
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91
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72
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92 override DeclarationStatement isDeclarationStatement() { return this; }
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93 }
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