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1 module dmd.InvariantDeclaration;
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2
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3 import dmd.FuncDeclaration;
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4 import dmd.Loc;
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5 import dmd.Dsymbol;
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6 import dmd.Id;
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7 import dmd.Scope;
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8 import dmd.OutBuffer;
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9 import dmd.HdrGenState;
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10 import dmd.LINK;
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11 import dmd.STC;
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12 import dmd.TypeFunction;
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13 import dmd.Type;
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14 import dmd.AggregateDeclaration;
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15
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16 class InvariantDeclaration : FuncDeclaration
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17 {
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18 this(Loc loc, Loc endloc)
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19 {
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20 super(loc, endloc, Id.classInvariant, STCundefined, null);
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21 }
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22
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72
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23 override Dsymbol syntaxCopy(Dsymbol s)
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24 {
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25 assert(!s);
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26 InvariantDeclaration id = new InvariantDeclaration(loc, endloc);
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27 FuncDeclaration.syntaxCopy(id);
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28 return id;
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29 }
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30
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72
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31 override void semantic(Scope sc)
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32 {
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33 AggregateDeclaration ad;
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34 Type tret;
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35
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36 parent = sc.parent;
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37 Dsymbol parent = toParent();
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38 ad = parent.isAggregateDeclaration();
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39 if (!ad)
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40 {
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41 error("invariants are only for struct/union/class definitions");
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42 return;
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43 }
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44 else if (ad.inv && ad.inv != this)
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45 {
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46 error("more than one invariant for %s", ad.toChars());
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47 }
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48 ad.inv = this;
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49 type = new TypeFunction(null, Type.tvoid, false, LINKd);
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50
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51 sc = sc.push();
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52 sc.stc &= ~STCstatic; // not a static invariant
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53 sc.incontract++;
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54 sc.linkage = LINK.LINKd;
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55
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56 FuncDeclaration.semantic(sc);
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57
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58 sc.pop();
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59 }
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60
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72
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61 override bool isVirtual()
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62 {
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63 return false;
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64 }
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65
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72
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66 override bool addPreInvariant()
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67 {
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68 return false;
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69 }
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70
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72
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71 override bool addPostInvariant()
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72 {
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73 return false;
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74 }
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75
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72
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76 override void emitComment(Scope sc)
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77 {
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78 assert(false);
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79 }
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80
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72
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81 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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82 {
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83 if (hgs.hdrgen)
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84 return;
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85 buf.writestring("invariant");
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86 bodyToCBuffer(buf, hgs);
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87 }
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88
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79
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89 override void toJsonBuffer(OutBuffer buf)
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90 {
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91 }
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92
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93 override InvariantDeclaration isInvariantDeclaration() { return this; }
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72
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94 }
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