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yap-6.3/H/Atoms.h
2015-09-21 17:05:36 -05:00

149 lines
4.0 KiB
C

/*************************************************************************
* *
* 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 *
* *
*************************************************************************/
#ifndef ATOMS_H
#define ATOMS_H 1
#ifndef EXTERN
#ifndef ADTDEFS_C
#define EXTERN static
#else
#define EXTERN
#endif
#endif
#include <wchar.h>
typedef struct atom_blob {
size_t length;
char data[MIN_ARRAY];
} atom_blob_t;
/********* 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 PropsOfAE; /* property list for this atom */
#if defined(YAPOR) || defined(THREADS)
rwlock_t ARWLock;
#endif
union {
unsigned char uUStrOfAE[MIN_ARRAY]; /* representation of atom as a string */
char uStrOfAE[MIN_ARRAY]; /* representation of atom as a string */
wchar_t uWStrOfAE[MIN_ARRAY]; /* representation of atom as a string */
struct atom_blob blob[MIN_ARRAY];
} rep;
}
AtomEntry;
// compatible with C and C++;
typedef struct ExtraAtomEntryStruct
{
Atom NextOfAE; /* used to build hash chains */
Prop PropsOfAE; /* property list for this atom */
#if defined(YAPOR) || defined(THREADS)
rwlock_t ARWLock;
#endif
union {
unsigned char uUStrOfAE[4]; /* representation of atom as a string */
char uStrOfAE[4]; /* representation of atom as a string */
wchar_t uWStrOfAE[2]; /* representation of atom as a string */
struct atom_blob blob[2];
} rep;
}
ExtraAtomEntry;
#define UStrOfAE rep.uUStrOfAE
#define StrOfAE rep.uStrOfAE
#define WStrOfAE rep.uWStrOfAE
/* Props and Atoms are stored in chains, ending with a NIL */
#ifdef USE_OFFSETS
# define EndOfPAEntr(P) ( Addr(P) == AtomBase)
#else
# define EndOfPAEntr(P) ( Addr(P) == NIL )
#endif
/* ********************** Properties **********************************/
#if defined(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
typedef CELL arity_t;
#define FunctorProperty ((PropFlags)(0xbb00))
/* functor property */
typedef struct FunctorEntryStruct
{
Prop NextOfPE; /* used to chain properties */
PropFlags KindOfPE; /* kind of property */
arity_t ArityOfFE; /* arity of functor */
Atom NameOfFE; /* back pointer to owner atom */
Prop PropsOfFE; /* pointer to list of properties for this functor */
#if defined(YAPOR) || defined(THREADS)
rwlock_t FRWLock;
#endif
} FunctorEntry;
typedef FunctorEntry *Functor;
#endif /* ATOMS_H */