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1 module dmd.InvariantDeclaration;
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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.FuncDeclaration;
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5 import dmd.Loc;
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6 import dmd.Dsymbol;
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7 import dmd.Id;
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8 import dmd.Scope;
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9 import dmd.OutBuffer;
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10 import dmd.HdrGenState;
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11 import dmd.LINK;
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12 import dmd.STC;
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13 import dmd.TypeFunction;
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14 import dmd.Type;
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15 import dmd.AggregateDeclaration;
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16
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17 class InvariantDeclaration : FuncDeclaration
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18 {
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19 this(Loc loc, Loc endloc)
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20 {
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178
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21 register();
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22 super(loc, endloc, Id.classInvariant, STCundefined, null);
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23 }
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24
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72
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25 override Dsymbol syntaxCopy(Dsymbol s)
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26 {
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27 assert(!s);
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28 InvariantDeclaration id = new InvariantDeclaration(loc, endloc);
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29 FuncDeclaration.syntaxCopy(id);
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30 return id;
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31 }
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32
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72
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33 override void semantic(Scope sc)
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34 {
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35 AggregateDeclaration ad;
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36 Type tret;
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37
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38 parent = sc.parent;
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39 Dsymbol parent = toParent();
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40 ad = parent.isAggregateDeclaration();
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41 if (!ad)
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42 {
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43 error("invariants are only for struct/union/class definitions");
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44 return;
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45 }
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46 else if (ad.inv && ad.inv != this)
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47 {
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48 error("more than one invariant for %s", ad.toChars());
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49 }
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50 ad.inv = this;
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51 type = new TypeFunction(null, Type.tvoid, false, LINKd);
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52
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53 sc = sc.push();
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54 sc.stc &= ~STCstatic; // not a static invariant
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55 sc.incontract++;
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56 sc.linkage = LINK.LINKd;
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57
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58 FuncDeclaration.semantic(sc);
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59
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60 sc.pop();
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61 }
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62
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72
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63 override bool isVirtual()
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64 {
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65 return false;
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66 }
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67
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68 override bool addPreInvariant()
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69 {
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70 return false;
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71 }
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72
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72
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73 override bool addPostInvariant()
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74 {
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75 return false;
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76 }
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77
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72
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78 override void emitComment(Scope sc)
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79 {
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80 assert(false);
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81 }
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82
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72
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83 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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84 {
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85 if (hgs.hdrgen)
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86 return;
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87 buf.writestring("invariant");
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88 bodyToCBuffer(buf, hgs);
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89 }
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90
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79
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91 override void toJsonBuffer(OutBuffer buf)
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92 {
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93 }
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94
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95 override InvariantDeclaration isInvariantDeclaration() { return this; }
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72
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96 }
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