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yap-6.3/m4/Atoms.h.m4
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/*************************************************************************
* *
* YAP Prolog %W% %G%
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: Atoms.h.m4 *
* Last rev: 19/2/88 *
* mods: *
* comments: atom properties header file for YAP *
* *
*************************************************************************/
#undef EXTERN
#ifndef ADTDEFS_C
#define EXTERN static
#else
#define EXTERN
#endif
/********* operations for atoms ****************************************/
/* Atoms are assumed to be uniquely represented by an OFFSET and to have
associated with them a struct of type AtomEntry
The two functions
RepAtom : Atom -> *AtomEntry
AbsAtom : *AtomEntry -> Atom
are used to encapsulate the implementation of atoms
*/
typedef struct AtomEntryStruct *Atom;
typedef struct PropEntryStruct *Prop;
/* I can only define the structure after I define the actual atoms */
/* atom structure */
typedef struct AtomEntryStruct {
Atom NextOfAE; /* used to build hash chains */
Prop PropOfAE; /* property list for this atom */
#if defined(YAPOR) || defined(THREADS)
rwlock_t ARWLock;
#endif
char StrOfAE[MIN_ARRAY]; /* representation of atom as a string */
}
AtomEntry;
/* Props and Atoms are stored in chains, ending with a NIL */
#if USE_OFFSETS
# define EndOfPAEntr(P) ( Addr(P) == AtomBase)
#else
# define EndOfPAEntr(P) ( Addr(P) == NIL )
#endif
#define AtomName(at) RepAtom(at)->StrOfAE
/* ********************** Properties **********************************/
#if USE_OFFSETS
#define USE_OFFSETS_IN_PROPS 1
#else
#define USE_OFFSETS_IN_PROPS 0
#endif
typedef SFLAGS PropFlags;
/* basic property entry structure */
typedef struct PropEntryStruct {
Prop NextOfPE; /* used to chain properties */
PropFlags KindOfPE; /* kind of property */
} PropEntry;
/* ************************* Functors **********************************/
/* Functor data type
abstype Functor = atom # int
with MkFunctor(a,n) = ...
and NameOfFunctor(f) = ...
and ArityOfFunctor(f) = ... */
#define MaxArity 255
#define FunctorProperty ((PropFlags)(0xbb00))
/* functor property */
typedef struct FunctorEntryStruct {
Prop NextOfPE; /* used to chain properties */
PropFlags KindOfPE; /* kind of property */
unsigned int ArityOfFE; /* arity of functor */
Atom NameOfFE; /* back pointer to owner atom */
Prop PropsOfFE; /* pointer to list of properties for this functor */
} FunctorEntry;
typedef FunctorEntry *Functor;