2001-07-16 15:26:14 +00:00
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/*************************************************************************
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* *
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* YAP Prolog %W% %G%
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: Atoms.h.m4 *
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* Last rev: 19/2/88 *
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* mods: *
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* comments: atom properties header file for YAP *
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* *
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*************************************************************************/
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#undef EXTERN
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#ifndef ADTDEFS_C
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#define EXTERN static
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#else
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#define EXTERN
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#endif
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/********* operations for atoms ****************************************/
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/* Atoms are assumed to be uniquely represented by an OFFSET and to have
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associated with them a struct of type AtomEntry
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The two functions
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RepAtom : Atom -> *AtomEntry
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AbsAtom : *AtomEntry -> Atom
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are used to encapsulate the implementation of atoms
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*/
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typedef struct AtomEntryStruct *Atom;
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typedef struct PropEntryStruct *Prop;
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/* I can only define the structure after I define the actual atoms */
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/* atom structure */
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typedef struct AtomEntryStruct {
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Atom NextOfAE; /* used to build hash chains */
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Prop PropOfAE; /* property list for this atom */
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#if defined(YAPOR) || defined(THREADS)
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rwlock_t ARWLock;
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#endif
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char StrOfAE[MIN_ARRAY]; /* representation of atom as a string */
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}
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AtomEntry;
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/* Props and Atoms are stored in chains, ending with a NIL */
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#if USE_OFFSETS
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# define EndOfPAEntr(P) ( Addr(P) == AtomBase)
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#else
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# define EndOfPAEntr(P) ( Addr(P) == NIL )
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#endif
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#define AtomName(at) RepAtom(at)->StrOfAE
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/* ********************** Properties **********************************/
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#if USE_OFFSETS
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#define USE_OFFSETS_IN_PROPS 1
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#else
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#define USE_OFFSETS_IN_PROPS 0
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#endif
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typedef SFLAGS PropFlags;
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/* basic property entry structure */
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typedef struct PropEntryStruct {
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Prop NextOfPE; /* used to chain properties */
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PropFlags KindOfPE; /* kind of property */
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} PropEntry;
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/* ************************* Functors **********************************/
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/* Functor data type
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abstype Functor = atom # int
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with MkFunctor(a,n) = ...
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and NameOfFunctor(f) = ...
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and ArityOfFunctor(f) = ... */
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#define MaxArity 255
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#define FunctorProperty ((PropFlags)(0xbb00))
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/* functor property */
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typedef struct FunctorEntryStruct {
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Prop NextOfPE; /* used to chain properties */
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PropFlags KindOfPE; /* kind of property */
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unsigned int ArityOfFE; /* arity of functor */
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Atom NameOfFE; /* back pointer to owner atom */
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Prop PropsOfFE; /* pointer to list of properties for this functor */
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} FunctorEntry;
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typedef FunctorEntry *Functor;
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