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yap-6.3/C/adtdefs.c
2010-04-09 11:46:59 +01:00

1462 lines
33 KiB
C

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: adtdefs.c *
* Last rev: *
* mods: *
* comments: abstract machine definitions *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "%W% %G%";
#endif
#define ADTDEFS_C
#ifdef __SUNPRO_CC
#define inline
#endif
#include "Yap.h"
ADDR STD_PROTO(Yap_PreAllocCodeSpace, (void));
Prop STD_PROTO(PredPropByFunc,(Functor, Term));
Prop STD_PROTO(PredPropByAtom,(Atom, Term));
#include "Yatom.h"
#include "yapio.h"
#include <stdio.h>
#include <wchar.h>
#if HAVE_STRING_H
#include <string.h>
#endif
/* this routine must be run at least having a read lock on ae */
static Prop
GetFunctorProp(AtomEntry *ae, unsigned int arity)
{ /* look property list of atom a for kind */
FunctorEntry *pp;
pp = RepFunctorProp(ae->PropsOfAE);
while (!EndOfPAEntr(pp) &&
(!IsFunctorProperty(pp->KindOfPE) ||
pp->ArityOfFE != arity))
pp = RepFunctorProp(pp->NextOfPE);
return (AbsFunctorProp(pp));
}
/* vsc: We must guarantee that IsVarTerm(functor) returns true! */
static inline Functor
InlinedUnlockedMkFunctor(AtomEntry *ae, unsigned int arity)
{
FunctorEntry *p;
Prop p0;
p0 = GetFunctorProp(ae, arity);
if (p0 != NIL) {
return ((Functor) RepProp(p0));
}
p = (FunctorEntry *) Yap_AllocAtomSpace(sizeof(*p));
if (!p)
return NULL;
p->KindOfPE = FunctorProperty;
p->NameOfFE = AbsAtom(ae);
p->ArityOfFE = arity;
p->PropsOfFE = NIL;
p->NextOfPE = ae->PropsOfAE;
INIT_RWLOCK(p->FRWLock);
ae->PropsOfAE = AbsProp((PropEntry *) p);
return ((Functor) p);
}
Functor
Yap_UnlockedMkFunctor(AtomEntry *ae, unsigned int arity)
{
return(InlinedUnlockedMkFunctor(ae, arity));
}
/* vsc: We must guarantee that IsVarTerm(functor) returns true! */
Functor
Yap_MkFunctor(Atom ap, unsigned int arity)
{
AtomEntry *ae = RepAtom(ap);
Functor f;
WRITE_LOCK(ae->ARWLock);
f = InlinedUnlockedMkFunctor(ae, arity);
WRITE_UNLOCK(ae->ARWLock);
return (f);
}
/* vsc: We must guarantee that IsVarTerm(functor) returns true! */
void
Yap_MkFunctorWithAddress(Atom ap, unsigned int arity, FunctorEntry *p)
{
AtomEntry *ae = RepAtom(ap);
WRITE_LOCK(ae->ARWLock);
p->KindOfPE = FunctorProperty;
p->NameOfFE = ap;
p->ArityOfFE = arity;
p->NextOfPE = RepAtom(ap)->PropsOfAE;
ae->PropsOfAE = AbsProp((PropEntry *) p);
WRITE_UNLOCK(ae->ARWLock);
}
inline static Atom
SearchInInvisible(char *atom)
{
AtomEntry *chain;
READ_LOCK(INVISIBLECHAIN.AERWLock);
chain = RepAtom(INVISIBLECHAIN.Entry);
while (!EndOfPAEntr(chain) && strcmp(chain->StrOfAE, atom) != 0) {
chain = RepAtom(chain->NextOfAE);
}
READ_UNLOCK(INVISIBLECHAIN.AERWLock);
if (EndOfPAEntr(chain))
return (NIL);
else
return(AbsAtom(chain));
}
static inline Atom
SearchAtom(unsigned char *p, Atom a) {
AtomEntry *ae;
/* search atom in chain */
while (a != NIL) {
ae = RepAtom(a);
if (strcmp(ae->StrOfAE, (const char *)p) == 0) {
return(a);
}
a = ae->NextOfAE;
}
return(NIL);
}
static inline Atom
SearchWideAtom(wchar_t *p, Atom a) {
AtomEntry *ae;
/* search atom in chain */
while (a != NIL) {
ae = RepAtom(a);
if (wcscmp((wchar_t *)ae->StrOfAE, p) == 0) {
return a;
}
a = ae->NextOfAE;
}
return(NIL);
}
static Atom
LookupAtom(char *atom)
{ /* lookup atom in atom table */
register CELL hash;
register unsigned char *p;
Atom a, na;
AtomEntry *ae;
/* compute hash */
p = (unsigned char *)atom;
hash = HashFunction(p) % AtomHashTableSize;
/* we'll start by holding a read lock in order to avoid contention */
READ_LOCK(HashChain[hash].AERWLock);
a = HashChain[hash].Entry;
/* search atom in chain */
na = SearchAtom((unsigned char *)atom, a);
if (na != NIL) {
READ_UNLOCK(HashChain[hash].AERWLock);
return(na);
}
READ_UNLOCK(HashChain[hash].AERWLock);
/* we need a write lock */
WRITE_LOCK(HashChain[hash].AERWLock);
/* concurrent version of Yap, need to take care */
#if defined(YAPOR) || defined(THREADS)
if (a != HashChain[hash].Entry) {
a = HashChain[hash].Entry;
na = SearchAtom((unsigned char *)atom, a);
if (na != NIL) {
WRITE_UNLOCK(HashChain[hash].AERWLock);
return(na);
}
}
#endif
/* add new atom to start of chain */
ae = (AtomEntry *) Yap_AllocAtomSpace((sizeof *ae) + strlen(atom) + 1);
if (ae == NULL) {
WRITE_UNLOCK(HashChain[hash].AERWLock);
return NIL;
}
NOfAtoms++;
na = AbsAtom(ae);
ae->PropsOfAE = NIL;
if (ae->StrOfAE != atom)
strcpy(ae->StrOfAE, atom);
ae->NextOfAE = a;
HashChain[hash].Entry = na;
INIT_RWLOCK(ae->ARWLock);
WRITE_UNLOCK(HashChain[hash].AERWLock);
if (NOfAtoms > 2*AtomHashTableSize) {
Yap_signal(YAP_CDOVF_SIGNAL);
}
return na;
}
static Atom
LookupWideAtom(wchar_t *atom)
{ /* lookup atom in atom table */
CELL hash;
wchar_t *p;
Atom a, na;
AtomEntry *ae;
UInt sz;
WideAtomEntry *wae;
/* compute hash */
p = atom;
hash = WideHashFunction(p) % WideAtomHashTableSize;
/* we'll start by holding a read lock in order to avoid contention */
READ_LOCK(WideHashChain[hash].AERWLock);
a = WideHashChain[hash].Entry;
/* search atom in chain */
na = SearchWideAtom(atom, a);
if (na != NIL) {
READ_UNLOCK(WideHashChain[hash].AERWLock);
return(na);
}
READ_UNLOCK(WideHashChain[hash].AERWLock);
/* we need a write lock */
WRITE_LOCK(WideHashChain[hash].AERWLock);
/* concurrent version of Yap, need to take care */
#if defined(YAPOR) || defined(THREADS)
if (a != WideHashChain[hash].Entry) {
a = WideHashChain[hash].Entry;
na = SearchWideAtom(atom, a);
if (na != NIL) {
WRITE_UNLOCK(WideHashChain[hash].AERWLock);
return na;
}
}
#endif
/* add new atom to start of chain */
sz = wcslen(atom);
ae = (AtomEntry *) Yap_AllocAtomSpace(sizeof(AtomEntry) + sizeof(wchar_t)*(sz + 1)+sizeof(WideAtomEntry));
if (ae == NULL) {
WRITE_UNLOCK(WideHashChain[hash].AERWLock);
return NIL;
}
wae = (WideAtomEntry *)(ae->StrOfAE+sizeof(wchar_t)*(sz + 1));
na = AbsAtom(ae);
ae->PropsOfAE = AbsWideAtomProp(wae);
wae->NextOfPE = NIL;
wae->KindOfPE = WideAtomProperty;
wae->SizeOfAtom = sz;
if (ae->StrOfAE != (char *)atom)
wcscpy((wchar_t *)(ae->StrOfAE), atom);
NOfAtoms++;
ae->NextOfAE = a;
WideHashChain[hash].Entry = na;
INIT_RWLOCK(ae->ARWLock);
WRITE_UNLOCK(WideHashChain[hash].AERWLock);
if (NOfWideAtoms > 2*WideAtomHashTableSize) {
Yap_signal(YAP_CDOVF_SIGNAL);
}
return na;
}
Atom
Yap_LookupMaybeWideAtom(wchar_t *atom)
{ /* lookup atom in atom table */
wchar_t *p = atom, c;
size_t len = 0;
char *ptr, *ptr0;
Atom at;
while ((c = *p++)) {
if (c > 255) return LookupWideAtom(atom);
len++;
}
/* not really a wide atom */
p = atom;
ptr0 = ptr = Yap_AllocCodeSpace(len+1);
if (!ptr)
return NIL;
while ((*ptr++ = *p++));
at = LookupAtom(ptr0);
Yap_FreeCodeSpace(ptr0);
return at;
}
Atom
Yap_LookupAtom(char *atom)
{ /* lookup atom in atom table */
return LookupAtom(atom);
}
Atom
Yap_LookupWideAtom(wchar_t *atom)
{ /* lookup atom in atom table */
return LookupWideAtom(atom);
}
Atom
Yap_FullLookupAtom(char *atom)
{ /* lookup atom in atom table */
Atom t;
if ((t = SearchInInvisible(atom)) != NIL) {
return (t);
}
return(LookupAtom(atom));
}
void
Yap_LookupAtomWithAddress(char *atom, AtomEntry *ae)
{ /* lookup atom in atom table */
register CELL hash;
register unsigned char *p;
Atom a;
/* compute hash */
p = (unsigned char *)atom;
hash = HashFunction(p) % AtomHashTableSize;
/* ask for a WRITE lock because it is highly unlikely we shall find anything */
WRITE_LOCK(HashChain[hash].AERWLock);
a = HashChain[hash].Entry;
/* search atom in chain */
if (SearchAtom(p, a) != NIL) {
Yap_Error(INTERNAL_ERROR,TermNil,"repeated initialisation for atom %s", ae);
WRITE_UNLOCK(HashChain[hash].AERWLock);
return;
}
/* add new atom to start of chain */
NOfAtoms++;
ae->NextOfAE = a;
HashChain[hash].Entry = AbsAtom(ae);
ae->PropsOfAE = NIL;
strcpy(ae->StrOfAE, atom);
INIT_RWLOCK(ae->ARWLock);
WRITE_UNLOCK(HashChain[hash].AERWLock);
}
void
Yap_ReleaseAtom(Atom atom)
{ /* Releases an atom from the hash chain */
register Int hash;
register unsigned char *p;
AtomEntry *inChain;
AtomEntry *ap = RepAtom(atom);
char *name = ap->StrOfAE;
/* compute hash */
p = (unsigned char *)name;
hash = HashFunction(p) % AtomHashTableSize;
WRITE_LOCK(HashChain[hash].AERWLock);
if (HashChain[hash].Entry == atom) {
NOfAtoms--;
HashChain[hash].Entry = ap->NextOfAE;
WRITE_UNLOCK(HashChain[hash].AERWLock);
return;
}
/* else */
inChain = RepAtom(HashChain[hash].Entry);
while (inChain->NextOfAE != atom)
inChain = RepAtom(inChain->NextOfAE);
WRITE_LOCK(inChain->ARWLock);
inChain->NextOfAE = ap->NextOfAE;
WRITE_UNLOCK(inChain->ARWLock);
WRITE_UNLOCK(HashChain[hash].AERWLock);
}
static Prop
GetAPropHavingLock(AtomEntry *ae, PropFlags kind)
{ /* look property list of atom a for kind */
PropEntry *pp;
pp = RepProp(ae->PropsOfAE);
while (!EndOfPAEntr(pp) && pp->KindOfPE != kind)
pp = RepProp(pp->NextOfPE);
return (AbsProp(pp));
}
Prop
Yap_GetAPropHavingLock(AtomEntry *ae, PropFlags kind)
{ /* look property list of atom a for kind */
return GetAPropHavingLock(ae,kind);
}
static Prop
GetAProp(Atom a, PropFlags kind)
{ /* look property list of atom a for kind */
AtomEntry *ae = RepAtom(a);
Prop out;
READ_LOCK(ae->ARWLock);
out = GetAPropHavingLock(ae, kind);
READ_UNLOCK(ae->ARWLock);
return (out);
}
Prop
Yap_GetAProp(Atom a, PropFlags kind)
{ /* look property list of atom a for kind */
return GetAProp(a,kind);
}
OpEntry *
Yap_GetOpPropForAModuleHavingALock(Atom a, Term mod)
{ /* look property list of atom a for kind */
AtomEntry *ae = RepAtom(a);
PropEntry *pp;
pp = RepProp(ae->PropsOfAE);
while (!EndOfPAEntr(pp) &&
(pp->KindOfPE != OpProperty ||
((OpEntry *)pp)->OpModule != mod))
pp = RepProp(pp->NextOfPE);
if (EndOfPAEntr(pp)) {
return NULL;
}
return (OpEntry *)pp;
}
int
Yap_HasOp(Atom a)
{ /* look property list of atom a for kind */
AtomEntry *ae = RepAtom(a);
PropEntry *pp;
READ_LOCK(ae->ARWLock);
pp = RepProp(ae->PropsOfAE);
while (!EndOfPAEntr(pp) &&
( pp->KindOfPE != OpProperty))
pp = RepProp(pp->NextOfPE);
READ_UNLOCK(ae->ARWLock);
if (EndOfPAEntr(pp)) {
return FALSE;
} else {
return TRUE;
}
}
OpEntry *
Yap_GetOpProp(Atom a, op_type type)
{ /* look property list of atom a for kind */
AtomEntry *ae = RepAtom(a);
PropEntry *pp;
OpEntry *info = NULL;
READ_LOCK(ae->ARWLock);
pp = RepProp(ae->PropsOfAE);
while (!EndOfPAEntr(pp) &&
( pp->KindOfPE != OpProperty ||
((OpEntry *)pp)->OpModule != CurrentModule))
pp = RepProp(pp->NextOfPE);
if ((info = (OpEntry *)pp)) {
if ((type == INFIX_OP && !info->Infix) ||
(type == POSFIX_OP && !info->Posfix) ||
(type == PREFIX_OP && !info->Prefix))
pp = RepProp(NIL);
}
if (EndOfPAEntr(pp)) {
pp = RepProp(ae->PropsOfAE);
while (!EndOfPAEntr(pp) &&
( pp->KindOfPE != OpProperty ||
((OpEntry *)pp)->OpModule != PROLOG_MODULE))
pp = RepProp(pp->NextOfPE);
if ((info = (OpEntry *)pp)) {
if ((type == INFIX_OP && !info->Infix) ||
(type == POSFIX_OP && !info->Posfix) ||
(type == PREFIX_OP && !info->Prefix))
pp = RepProp(NIL);
}
}
if (!info) {
READ_UNLOCK(ae->ARWLock);
return NULL;
} else {
READ_LOCK(info->OpRWLock);
READ_UNLOCK(ae->ARWLock);
return info;
}
}
inline static Prop
GetPredPropByAtomHavingLock(AtomEntry* ae, Term cur_mod)
/* get predicate entry for ap/arity; create it if neccessary. */
{
Prop p0;
p0 = ae->PropsOfAE;
while (p0) {
PredEntry *pe = RepPredProp(p0);
if ( pe->KindOfPE == PEProp &&
(pe->ModuleOfPred == cur_mod || !pe->ModuleOfPred)) {
return(p0);
#if THREADS
/* Thread Local Predicates */
if (pe->PredFlags & ThreadLocalPredFlag) {
return AbsPredProp(Yap_GetThreadPred(pe));
}
#endif
}
p0 = pe->NextOfPE;
}
return(NIL);
}
Prop
Yap_GetPredPropByAtom(Atom at, Term cur_mod)
/* get predicate entry for ap/arity; create it if neccessary. */
{
Prop p0;
AtomEntry *ae = RepAtom(at);
READ_LOCK(ae->ARWLock);
p0 = GetPredPropByAtomHavingLock(ae, cur_mod);
READ_UNLOCK(ae->ARWLock);
return(p0);
}
inline static Prop
GetPredPropByAtomHavingLockInThisModule(AtomEntry* ae, Term cur_mod)
/* get predicate entry for ap/arity; create it if neccessary. */
{
Prop p0;
p0 = ae->PropsOfAE;
while (p0) {
PredEntry *pe = RepPredProp(p0);
if ( pe->KindOfPE == PEProp && pe->ModuleOfPred == cur_mod ) {
#if THREADS
/* Thread Local Predicates */
if (pe->PredFlags & ThreadLocalPredFlag) {
return AbsPredProp(Yap_GetThreadPred(pe));
}
#endif
return(p0);
}
p0 = pe->NextOfPE;
}
return(NIL);
}
Prop
Yap_GetPredPropByAtomInThisModule(Atom at, Term cur_mod)
/* get predicate entry for ap/arity; create it if neccessary. */
{
Prop p0;
AtomEntry *ae = RepAtom(at);
READ_LOCK(ae->ARWLock);
p0 = GetPredPropByAtomHavingLockInThisModule(ae, cur_mod);
READ_UNLOCK(ae->ARWLock);
return(p0);
}
Prop
Yap_GetPredPropByFunc(Functor f, Term cur_mod)
/* get predicate entry for ap/arity; */
{
Prop p0;
READ_LOCK(f->FRWLock);
p0 = GetPredPropByFuncHavingLock(f, cur_mod);
READ_UNLOCK(f->FRWLock);
return (p0);
}
Prop
Yap_GetPredPropByFuncInThisModule(Functor f, Term cur_mod)
/* get predicate entry for ap/arity; */
{
Prop p0;
READ_LOCK(f->FRWLock);
p0 = GetPredPropByFuncHavingLock(f, cur_mod);
READ_UNLOCK(f->FRWLock);
return (p0);
}
Prop
Yap_GetPredPropHavingLock(Atom ap, unsigned int arity, Term mod)
/* get predicate entry for ap/arity; */
{
Prop p0;
AtomEntry *ae = RepAtom(ap);
Functor f;
if (arity == 0) {
GetPredPropByAtomHavingLock(ae, mod);
}
f = InlinedUnlockedMkFunctor(ae, arity);
READ_LOCK(f->FRWLock);
p0 = GetPredPropByFuncHavingLock(f, mod);
READ_UNLOCK(f->FRWLock);
return (p0);
}
/* get expression entry for at/arity; */
Prop
Yap_GetExpProp(Atom at, unsigned int arity)
{
Prop p0;
AtomEntry *ae = RepAtom(at);
ExpEntry *p;
READ_LOCK(ae->ARWLock);
p = RepExpProp(p0 = ae->PropsOfAE);
while (p0 && (p->KindOfPE != ExpProperty || p->ArityOfEE != arity))
p = RepExpProp(p0 = p->NextOfPE);
READ_UNLOCK(ae->ARWLock);
return (p0);
}
/* get expression entry for at/arity, at is already locked; */
Prop
Yap_GetExpPropHavingLock(AtomEntry *ae, unsigned int arity)
{
Prop p0;
ExpEntry *p;
p = RepExpProp(p0 = ae->PropsOfAE);
while (p0 && (p->KindOfPE != ExpProperty || p->ArityOfEE != arity))
p = RepExpProp(p0 = p->NextOfPE);
return (p0);
}
static int
ExpandPredHash(void)
{
UInt new_size = PredHashTableSize+PredHashIncrement;
PredEntry **oldp = PredHash;
PredEntry **np = (PredEntry **) Yap_AllocAtomSpace(sizeof(PredEntry **)*new_size);
UInt i;
if (!np) {
return FALSE;
}
for (i = 0; i < new_size; i++) {
np[i] = NULL;
}
for (i = 0; i < PredHashTableSize; i++) {
PredEntry *p = PredHash[i];
while (p) {
Prop nextp = p->NextOfPE;
UInt hsh = PRED_HASH(p->FunctorOfPred, p->ModuleOfPred, new_size);
p->NextOfPE = AbsPredProp(np[hsh]);
np[hsh] = p;
p = RepPredProp(nextp);
}
}
PredHashTableSize = new_size;
PredHash = np;
Yap_FreeAtomSpace((ADDR)oldp);
return TRUE;
}
/* fe is supposed to be locked */
Prop
Yap_NewPredPropByFunctor(FunctorEntry *fe, Term cur_mod)
{
PredEntry *p = (PredEntry *) Yap_AllocAtomSpace(sizeof(*p));
if (p == NULL) {
WRITE_UNLOCK(fe->FRWLock);
return NULL;
}
if (cur_mod == TermProlog)
p->ModuleOfPred = 0L;
else
p->ModuleOfPred = cur_mod;
if (fe->PropsOfFE) {
UInt hsh = PRED_HASH(fe, cur_mod, PredHashTableSize);
WRITE_LOCK(PredHashRWLock);
if (10*(PredsInHashTable+1) > 6*PredHashTableSize) {
if (!ExpandPredHash()) {
Yap_FreeCodeSpace((ADDR)p);
WRITE_UNLOCK(PredHashRWLock);
WRITE_UNLOCK(fe->FRWLock);
return NULL;
}
/* retry hashing */
hsh = PRED_HASH(fe, cur_mod, PredHashTableSize);
}
PredsInHashTable++;
if (p->ModuleOfPred == 0L) {
PredEntry *pe = RepPredProp(fe->PropsOfFE);
hsh = PRED_HASH(fe, pe->ModuleOfPred, PredHashTableSize);
/* should be the first one */
pe->NextOfPE = AbsPredProp(PredHash[hsh]);
PredHash[hsh] = pe;
fe->PropsOfFE = AbsPredProp(p);
} else {
p->NextOfPE = AbsPredProp(PredHash[hsh]);
PredHash[hsh] = p;
}
WRITE_UNLOCK(PredHashRWLock);
/* make sure that we have something here: note that this is not a valid pointer!! */
RepPredProp(fe->PropsOfFE)->NextOfPE = fe->PropsOfFE;
} else {
fe->PropsOfFE = AbsPredProp(p);
p->NextOfPE = NIL;
}
INIT_LOCK(p->PELock);
p->KindOfPE = PEProp;
p->ArityOfPE = fe->ArityOfFE;
p->cs.p_code.FirstClause = p->cs.p_code.LastClause = NULL;
p->cs.p_code.NOfClauses = 0;
p->PredFlags = 0L;
p->src.OwnerFile = AtomNil;
p->OpcodeOfPred = UNDEF_OPCODE;
p->CodeOfPred = p->cs.p_code.TrueCodeOfPred = (yamop *)(&(p->OpcodeOfPred));
p->cs.p_code.ExpandCode = EXPAND_OP_CODE;
p->TimeStampOfPred = 0L;
p->LastCallOfPred = LUCALL_ASSERT;
if (cur_mod == TermProlog)
p->ModuleOfPred = 0L;
else
p->ModuleOfPred = cur_mod;
Yap_NewModulePred(cur_mod, p);
INIT_LOCK(p->StatisticsForPred.lock);
p->StatisticsForPred.NOfEntries = 0;
p->StatisticsForPred.NOfHeadSuccesses = 0;
p->StatisticsForPred.NOfRetries = 0;
#ifdef TABLING
p->TableOfPred = NULL;
#endif /* TABLING */
#ifdef BEAM
p->beamTable = NULL;
#endif /* BEAM */
/* careful that they don't cross MkFunctor */
if (PRED_GOAL_EXPANSION_FUNC) {
if (fe->PropsOfFE &&
(RepPredProp(fe->PropsOfFE)->PredFlags & GoalExPredFlag)) {
p->PredFlags |= GoalExPredFlag;
}
}
p->FunctorOfPred = fe;
WRITE_UNLOCK(fe->FRWLock);
#ifdef LOW_PROF
if (ProfilerOn &&
Yap_OffLineProfiler) {
Yap_inform_profiler_of_clause((yamop *)&(p->OpcodeOfPred), (yamop *)(&(p->OpcodeOfPred)+1), p, 1);
if (!(p->PredFlags & (CPredFlag|AsmPredFlag))) {
Yap_inform_profiler_of_clause((yamop *)&(p->cs.p_code.ExpandCode), (yamop *)(&(p->cs.p_code.ExpandCode)+1), p, 1);
}
}
#endif /* LOW_PROF */
return AbsPredProp(p);
}
#if THREADS
Prop
Yap_NewThreadPred(PredEntry *ap)
{
PredEntry *p = (PredEntry *) Yap_AllocAtomSpace(sizeof(*p));
if (p == NULL) {
return NIL;
}
INIT_LOCK(p->PELock);
p->KindOfPE = PEProp;
p->ArityOfPE = ap->ArityOfPE;
p->cs.p_code.FirstClause = p->cs.p_code.LastClause = NULL;
p->cs.p_code.NOfClauses = 0;
p->PredFlags = ap->PredFlags & ~(IndexedPredFlag|SpiedPredFlag);
p->src.OwnerFile = ap->src.OwnerFile;
p->OpcodeOfPred = UNDEF_OPCODE;
p->CodeOfPred = p->cs.p_code.TrueCodeOfPred = (yamop *)(&(p->OpcodeOfPred));
p->cs.p_code.ExpandCode = EXPAND_OP_CODE;
p->ModuleOfPred = ap->ModuleOfPred;
p->NextPredOfModule = NULL;
p->TimeStampOfPred = 0L;
p->LastCallOfPred = LUCALL_ASSERT;
INIT_LOCK(p->StatisticsForPred.lock);
p->StatisticsForPred.NOfEntries = 0;
p->StatisticsForPred.NOfHeadSuccesses = 0;
p->StatisticsForPred.NOfRetries = 0;
#ifdef TABLING
p->TableOfPred = NULL;
#endif /* TABLING */
#ifdef BEAM
p->beamTable = NULL;
#endif
/* careful that they don't cross MkFunctor */
p->NextOfPE = AbsPredProp(MY_ThreadHandle.local_preds);
MY_ThreadHandle.local_preds = p;
p->FunctorOfPred = ap->FunctorOfPred;
#ifdef LOW_PROF
if (ProfilerOn &&
Yap_OffLineProfiler) {
Yap_inform_profiler_of_clause((yamop *)&(p->OpcodeOfPred), (yamop *)(&(p->OpcodeOfPred)+1), p, 1);
if (!(p->PredFlags & (CPredFlag|AsmPredFlag))) {
Yap_inform_profiler_of_clause((yamop *)&(p->cs.p_code.ExpandCode), (yamop *)(&(p->cs.p_code.ExpandCode)+1), p, 1);
}
}
#endif /* LOW_PROF */
return AbsPredProp(p);
}
#endif
Prop
Yap_NewPredPropByAtom(AtomEntry *ae, Term cur_mod)
{
Prop p0;
PredEntry *p = (PredEntry *) Yap_AllocAtomSpace(sizeof(*p));
/* Printf("entering %s:%s/0\n", RepAtom(AtomOfTerm(cur_mod))->StrOfAE, ae->StrOfAE); */
if (p == NULL) {
WRITE_UNLOCK(ae->ARWLock);
return NIL;
}
INIT_LOCK(p->PELock);
p->KindOfPE = PEProp;
p->ArityOfPE = 0;
p->cs.p_code.FirstClause = p->cs.p_code.LastClause = NULL;
p->cs.p_code.NOfClauses = 0;
p->PredFlags = 0L;
p->src.OwnerFile = AtomNil;
p->OpcodeOfPred = UNDEF_OPCODE;
p->cs.p_code.ExpandCode = EXPAND_OP_CODE;
p->CodeOfPred = p->cs.p_code.TrueCodeOfPred = (yamop *)(&(p->OpcodeOfPred));
if (cur_mod == TermProlog)
p->ModuleOfPred = 0;
else
p->ModuleOfPred = cur_mod;
Yap_NewModulePred(cur_mod, p);
INIT_LOCK(p->StatisticsForPred.lock);
p->StatisticsForPred.NOfEntries = 0;
p->StatisticsForPred.NOfHeadSuccesses = 0;
p->StatisticsForPred.NOfRetries = 0;
p->TimeStampOfPred = 0L;
p->LastCallOfPred = LUCALL_ASSERT;
#ifdef TABLING
p->TableOfPred = NULL;
#endif /* TABLING */
#ifdef BEAM
p->beamTable = NULL;
#endif
/* careful that they don't cross MkFunctor */
p->NextOfPE = ae->PropsOfAE;
if (PRED_GOAL_EXPANSION_FUNC) {
Prop p1 = ae->PropsOfAE;
while (p1) {
PredEntry *pe = RepPredProp(p1);
if (pe->KindOfPE == PEProp) {
if (pe->PredFlags & GoalExPredFlag) {
p->PredFlags |= GoalExPredFlag;
}
break;
}
p1 = pe->NextOfPE;
}
}
ae->PropsOfAE = p0 = AbsPredProp(p);
p->FunctorOfPred = (Functor)AbsAtom(ae);
WRITE_UNLOCK(ae->ARWLock);
#ifdef LOW_PROF
if (ProfilerOn &&
Yap_OffLineProfiler) {
Yap_inform_profiler_of_clause((yamop *)&(p->OpcodeOfPred), (yamop *)(&(p->OpcodeOfPred)+1), p, 1);
if (!(p->PredFlags & (CPredFlag|AsmPredFlag))) {
Yap_inform_profiler_of_clause((yamop *)&(p->cs.p_code.ExpandCode), (yamop *)(&(p->cs.p_code.ExpandCode)+1), p, 1);
}
}
#endif /* LOW_PROF */
return p0;
}
Prop
Yap_PredPropByFunctorNonThreadLocal(Functor f, Term cur_mod)
/* get predicate entry for ap/arity; create it if neccessary. */
{
PredEntry *p;
WRITE_LOCK(f->FRWLock);
if (!(p = RepPredProp(f->PropsOfFE)))
return Yap_NewPredPropByFunctor(f,cur_mod);
if ((p->ModuleOfPred == cur_mod || !(p->ModuleOfPred))) {
WRITE_UNLOCK(f->FRWLock);
return AbsPredProp(p);
}
if (p->NextOfPE) {
UInt hash = PRED_HASH(f,cur_mod,PredHashTableSize);
READ_LOCK(PredHashRWLock);
p = PredHash[hash];
while (p) {
if (p->FunctorOfPred == f &&
p->ModuleOfPred == cur_mod)
{
READ_UNLOCK(PredHashRWLock);
WRITE_UNLOCK(f->FRWLock);
return AbsPredProp(p);
}
p = RepPredProp(p->NextOfPE);
}
READ_UNLOCK(PredHashRWLock);
}
return Yap_NewPredPropByFunctor(f,cur_mod);
}
Prop
Yap_PredPropByAtomNonThreadLocal(Atom at, Term cur_mod)
/* get predicate entry for ap/arity; create it if neccessary. */
{
Prop p0;
AtomEntry *ae = RepAtom(at);
WRITE_LOCK(ae->ARWLock);
p0 = ae->PropsOfAE;
while (p0) {
PredEntry *pe = RepPredProp(p0);
if ( pe->KindOfPE == PEProp &&
(pe->ModuleOfPred == cur_mod || !pe->ModuleOfPred)) {
WRITE_UNLOCK(ae->ARWLock);
return(p0);
}
p0 = pe->NextOfPE;
}
return Yap_NewPredPropByAtom(ae,cur_mod);
}
Term
Yap_GetValue(Atom a)
{
Prop p0 = GetAProp(a, ValProperty);
Term out;
if (p0 == NIL)
return (TermNil);
READ_LOCK(RepValProp(p0)->VRWLock);
out = RepValProp(p0)->ValueOfVE;
if (IsApplTerm(out)) {
Functor f = FunctorOfTerm(out);
if (f == FunctorDouble) {
out = MkFloatTerm(FloatOfTerm(out));
} else if (f == FunctorLongInt) {
out = MkLongIntTerm(LongIntOfTerm(out));
}
#ifdef USE_GMP
else {
out = Yap_MkBigIntTerm(Yap_BigIntOfTerm(out));
}
#endif
}
READ_UNLOCK(RepValProp(p0)->VRWLock);
return (out);
}
void
Yap_PutValue(Atom a, Term v)
{
AtomEntry *ae = RepAtom(a);
Prop p0;
ValEntry *p;
Term t0;
WRITE_LOCK(ae->ARWLock);
p0 = GetAPropHavingLock(ae, ValProperty);
if (p0 != NIL) {
p = RepValProp(p0);
WRITE_LOCK(p->VRWLock);
WRITE_UNLOCK(ae->ARWLock);
} else {
p = (ValEntry *) Yap_AllocAtomSpace(sizeof(ValEntry));
if (p == NULL) {
WRITE_UNLOCK(ae->ARWLock);
return;
}
p->NextOfPE = RepAtom(a)->PropsOfAE;
RepAtom(a)->PropsOfAE = AbsValProp(p);
p->KindOfPE = ValProperty;
p->ValueOfVE = TermNil;
/* take care that the lock for the property will be inited even
if someone else searches for the property */
INIT_RWLOCK(p->VRWLock);
WRITE_LOCK(p->VRWLock);
WRITE_UNLOCK(ae->ARWLock);
}
t0 = p->ValueOfVE;
if (IsFloatTerm(v)) {
/* store a float in code space, so that we can access the property */
union {
Float f;
CELL ar[sizeof(Float) / sizeof(CELL)];
} un;
CELL *pt, *iptr;
unsigned int i;
un.f = FloatOfTerm(v);
if (IsFloatTerm(t0)) {
pt = RepAppl(t0);
} else {
if (IsApplTerm(t0)) {
Yap_FreeCodeSpace((char *) (RepAppl(t0)));
}
pt = (CELL *) Yap_AllocAtomSpace(sizeof(CELL)*(1 + 2*sizeof(Float)/sizeof(CELL)));
if (pt == NULL) {
WRITE_UNLOCK(ae->ARWLock);
return;
}
p->ValueOfVE = AbsAppl(pt);
pt[0] = (CELL)FunctorDouble;
}
iptr = pt+1;
for (i = 0; i < sizeof(Float) / sizeof(CELL); i++) {
*iptr++ = (CELL)un.ar[i];
}
} else if (IsLongIntTerm(v)) {
CELL *pt;
Int val = LongIntOfTerm(v);
if (IsLongIntTerm(t0)) {
pt = RepAppl(t0);
} else {
if (IsApplTerm(t0)) {
Yap_FreeCodeSpace((char *) (RepAppl(t0)));
}
pt = (CELL *) Yap_AllocAtomSpace(2*sizeof(CELL));
if (pt == NULL) {
WRITE_UNLOCK(ae->ARWLock);
return;
}
p->ValueOfVE = AbsAppl(pt);
pt[0] = (CELL)FunctorLongInt;
}
pt[1] = (CELL)val;
#ifdef USE_GMP
} else if (IsBigIntTerm(v)) {
CELL *ap = RepAppl(v);
Int sz =
sizeof(MP_INT)+sizeof(CELL)+
(((MP_INT *)(ap+1))->_mp_alloc*sizeof(mp_limb_t));
CELL *pt = (CELL *) Yap_AllocAtomSpace(sz);
if (pt == NULL) {
WRITE_UNLOCK(ae->ARWLock);
return;
}
if (IsApplTerm(t0)) {
Yap_FreeCodeSpace((char *) RepAppl(t0));
}
memcpy((void *)pt, (void *)ap, sz);
p->ValueOfVE = AbsAppl(pt);
#endif
} else {
if (IsApplTerm(t0)) {
/* recover space */
Yap_FreeCodeSpace((char *) (RepAppl(p->ValueOfVE)));
}
p->ValueOfVE = v;
}
WRITE_UNLOCK(p->VRWLock);
}
Term
Yap_StringToList(char *s)
{
register Term t;
register unsigned char *cp = (unsigned char *)s + strlen(s);
t = MkAtomTerm(AtomNil);
while (cp > (unsigned char *)s) {
t = MkPairTerm(MkIntTerm(*--cp), t);
}
return (t);
}
Term
Yap_NStringToList(char *s, size_t len)
{
Term t;
char *cp = s + len;
t = MkAtomTerm(AtomNil);
while (cp > s) {
t = MkPairTerm(MkIntegerTerm(*--cp), t);
}
return t;
}
Term
Yap_WideStringToList(wchar_t *s)
{
Term t;
wchar_t *cp = s + wcslen(s);
t = MkAtomTerm(AtomNil);
while (cp > s) {
t = MkPairTerm(MkIntegerTerm(*--cp), t);
}
return t;
}
Term
Yap_NWideStringToList(wchar_t *s, size_t len)
{
Term t;
wchar_t *cp = s + len;
t = MkAtomTerm(AtomNil);
while (cp > s) {
t = MkPairTerm(MkIntegerTerm(*--cp), t);
}
return t;
}
Term
Yap_StringToDiffList(char *s, Term t)
{
register unsigned char *cp = (unsigned char *)s + strlen(s);
while (cp > (unsigned char *)s) {
t = MkPairTerm(MkIntTerm(*--cp), t);
}
return t;
}
Term
Yap_NStringToDiffList(char *s, Term t, size_t len)
{
register unsigned char *cp = (unsigned char *)s + len;
while (cp > (unsigned char *)s) {
t = MkPairTerm(MkIntTerm(*--cp), t);
}
return t;
}
Term
Yap_WideStringToDiffList(wchar_t *s, Term t)
{
wchar_t *cp = s + wcslen(s);
while (cp > s) {
t = MkPairTerm(MkIntegerTerm(*--cp), t);
}
return t;
}
Term
Yap_NWideStringToDiffList(wchar_t *s, Term t, size_t len)
{
wchar_t *cp = s + len;
while (cp > s) {
t = MkPairTerm(MkIntegerTerm(*--cp), t);
}
return t;
}
Term
Yap_StringToListOfAtoms(char *s)
{
register Term t;
char so[2];
register unsigned char *cp = (unsigned char *)s + strlen(s);
so[1] = '\0';
t = MkAtomTerm(AtomNil);
while (cp > (unsigned char *)s) {
so[0] = *--cp;
t = MkPairTerm(MkAtomTerm(LookupAtom(so)), t);
}
return t;
}
Term
Yap_NStringToListOfAtoms(char *s, size_t len)
{
register Term t;
char so[2];
register unsigned char *cp = (unsigned char *)s + len;
so[1] = '\0';
t = MkAtomTerm(AtomNil);
while (cp > (unsigned char *)s) {
so[0] = *--cp;
t = MkPairTerm(MkAtomTerm(LookupAtom(so)), t);
}
return t;
}
Term
Yap_WideStringToListOfAtoms(wchar_t *s)
{
register Term t;
wchar_t so[2];
wchar_t *cp = s + wcslen(s);
so[1] = '\0';
t = MkAtomTerm(AtomNil);
while (cp > s) {
so[0] = *--cp;
t = MkPairTerm(MkAtomTerm(LookupWideAtom(so)), t);
}
return t;
}
Term
Yap_NWideStringToListOfAtoms(wchar_t *s, size_t len)
{
register Term t;
wchar_t so[2];
wchar_t *cp = s + len;
so[1] = '\0';
t = MkAtomTerm(AtomNil);
while (cp > s) {
so[0] = *--cp;
t = MkPairTerm(MkAtomTerm(LookupWideAtom(so)), t);
}
return t;
}
Term
Yap_NWideStringToDiffListOfAtoms(wchar_t *s, Term t0, size_t len)
{
register Term t;
wchar_t so[2];
wchar_t *cp = s + len;
so[1] = '\0';
t = t0;
while (cp > s) {
so[0] = *--cp;
t = MkPairTerm(MkAtomTerm(LookupWideAtom(so)), t);
}
return t;
}
Term
Yap_ArrayToList(register Term *tp, int nof)
{
register Term *pt = tp + nof;
register Term t;
t = MkAtomTerm(AtomNil);
while (pt > tp) {
Term tm = *--pt;
#if SBA
if (tm == 0)
t = MkPairTerm((CELL)pt, t);
else
#endif
t = MkPairTerm(tm, t);
}
return (t);
}
int
Yap_GetName(char *s, UInt max, Term t)
{
register Term Head;
register Int i;
if (IsVarTerm(t) || !IsPairTerm(t))
return FALSE;
while (IsPairTerm(t)) {
Head = HeadOfTerm(t);
if (!IsNumTerm(Head))
return (FALSE);
i = IntOfTerm(Head);
if (i < 0 || i > MAX_ISO_LATIN1)
return FALSE;
*s++ = i;
t = TailOfTerm(t);
if (--max == 0) {
Yap_Error(FATAL_ERROR,t,"not enough space for GetName");
}
}
*s = '\0';
return TRUE;
}
#ifdef SFUNC
Term
MkSFTerm(Functor f, int n, Term *a, empty_value)
{
Term t, p = AbsAppl(H);
int i;
*H++ = f;
RESET_VARIABLE(H);
++H;
for (i = 1; i <= n; ++i) {
t = Derefa(a++);
if (t != empty_value) {
*H++ = i;
*H++ = t;
}
}
*H++ = 0;
return (p);
}
CELL *
ArgsOfSFTerm(Term t)
{
CELL *p = RepAppl(t) + 1;
while (*p != (CELL) p)
p = CellPtr(*p) + 1;
return (p + 1);
}
#endif
long
Yap_NewSlots(int n)
{
Int old_slots = IntOfTerm(ASP[0]), oldn = n;
while (n > 0) {
RESET_VARIABLE(ASP);
ASP--;
n--;
}
ASP[0] = MkIntTerm(old_slots+oldn);
return((ASP+1)-LCL0);
}
long
Yap_InitSlot(Term t)
{
Int old_slots = IntOfTerm(ASP[0]);
*ASP = t;
ASP--;
ASP[0] = MkIntTerm(old_slots+1);
return((ASP+1)-LCL0);
}
int
Yap_RecoverSlots(int n)
{
Int old_slots = IntOfTerm(ASP[0]);
if (old_slots - n < 0) {
return FALSE;
}
ASP += n;
ASP[0] = MkIntTerm(old_slots-n);
return TRUE;
}
Term
Yap_GetFromSlot(long slot)
{
return(Deref(LCL0[slot]));
}
Term
Yap_GetPtrFromSlot(long slot)
{
return(LCL0[slot]);
}
Term *
Yap_AddressFromSlot(long slot)
{
return(LCL0+slot);
}
void
Yap_PutInSlot(long slot, Term t)
{
LCL0[slot] = t;
}
static HoldEntry *
InitAtomHold(void)
{
HoldEntry *x = (HoldEntry *)Yap_AllocAtomSpace(sizeof(struct hold_entry));
if (x == NULL) {
return NULL;
}
x->KindOfPE = HoldProperty;
x->NextOfPE = NIL;
x->RefsOfPE = 1;
return x;
}
int
Yap_AtomIncreaseHold(Atom at)
{
AtomEntry *ae = RepAtom(at);
HoldEntry *pp;
Prop *opp = &(ae->PropsOfAE);
WRITE_LOCK(ae->ARWLock);
pp = RepHoldProp(ae->PropsOfAE);
while (!EndOfPAEntr(pp)
&& pp->KindOfPE != HoldProperty) {
opp = &(pp->NextOfPE);
pp = RepHoldProp(pp->NextOfPE);
}
if (!pp) {
HoldEntry *new = InitAtomHold();
if (!new) {
WRITE_UNLOCK(ae->ARWLock);
return FALSE;
}
*opp = AbsHoldProp(new);
} else {
pp->RefsOfPE++;
}
WRITE_UNLOCK(ae->ARWLock);
return TRUE;
}
int
Yap_AtomDecreaseHold(Atom at)
{
AtomEntry *ae = RepAtom(at);
HoldEntry *pp;
Prop *opp = &(ae->PropsOfAE);
WRITE_LOCK(ae->ARWLock);
pp = RepHoldProp(ae->PropsOfAE);
while (!EndOfPAEntr(pp)
&& pp->KindOfPE != HoldProperty) {
opp = &(pp->NextOfPE);
pp = RepHoldProp(pp->NextOfPE);
}
if (!pp) {
WRITE_UNLOCK(ae->ARWLock);
return FALSE;
}
pp->RefsOfPE--;
if (!pp->RefsOfPE) {
*opp = pp->NextOfPE;
Yap_FreeCodeSpace((ADDR)pp);
}
WRITE_UNLOCK(ae->ARWLock);
return TRUE;
}