yap-6.3/C/init.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:		init.c							 *
* Last rev:								 *
* mods:									 *
* comments:	initializing a prolog session				 *
*									 *
*************************************************************************/
#ifdef SCCS
static char     SccsId[] = "%W% %G%";
#endif

/*
 * The code from this file is used to initialize the environment for prolog
 *
 */

#include <stdlib.h>
#include "Yap.h"
#include "clause.h"
#include "yapio.h"
#include "alloc.h"
#include "Foreign.h"

#ifdef LOW_LEVEL_TRACER
#include "tracer.h"
#endif
#ifdef YAPOR
#ifdef YAPOR_COW
#include <signal.h>
#endif /* YAPOR_COW */
#include "or.macros.h"
#endif /* YAPOR */
#if defined(YAPOR) || defined(TABLING)
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#endif	/* YAPOR || TABLING */
#if HAVE_STRING_H
#include <string.h>
#endif

int  Yap_output_msg = FALSE;

#if DEBUG

#define	LOGFILE	"logfile"

#ifdef MACC
static void  InTTYLine(char *);
#endif
#endif
static void  SetOp(int, int, char *, Term);
static void  InitOps(void);
static void  InitDebug(void);
static void  CleanBack(PredEntry *, CPredicate, CPredicate, CPredicate);
static void  InitStdPreds(void);
static void  InitFlags(void);
static void  InitCodes(void);
static void  InitVersion(void);
void  exit(int);
static void InitWorker(int wid);


/**************	YAP PROLOG GLOBAL VARIABLES *************************/

/************* variables related to memory allocation ***************/
ADDR Yap_HeapBase;

/**************	declarations local to init.c ************************/
static char    *optypes[] =
{"", "xfx", "xfy", "yfx", "xf", "yf", "fx", "fy"};

/* OS page size for memory allocation */
int Yap_page_size;

#if DEBUG
#if COROUTINING
int  Yap_Portray_delays = FALSE;
#endif
#endif


/**

@defgroup Operators Summary of YAP Predefined Operators
@ingroup Syntax
@{



The Prolog syntax caters for operators of three main kinds:

  +  prefix;
  + infix;
  + postfix.


Each operator has precedence in the range 1 to 1200, and this
precedence is used to disambiguate expressions where the structure of the
term denoted is not made explicit using brackets. The operator of higher
precedence is the main functor.

If there are two operators with the highest precedence, the ambiguity
is solved analyzing the types of the operators. The possible infix types are:
 _xfx_,  _xfy_, and  _yfx_.

With an operator of type  _xfx_ both sub-expressions must have lower
precedence than the operator itself, unless they are bracketed (which
assigns to them zero precedence). With an operator type  _xfy_ only the
left-hand sub-expression must have lower precedence. The opposite happens
for  _yfx_ type.

A prefix operator can be of type  _fx_ or  _fy_.
A postfix operator can be of type  _xf_ or  _yf_.
The meaning of the notation is analogous to the above.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a + b * c
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
means

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a + (b * c)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
as + and \* have the following types and precedences:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:-op(500,yfx,'+').
:-op(400,yfx,'*').
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Now defining

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:-op(700,xfy,'++').
:-op(700,xfx,'=:=').
a ++ b =:= c
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 means

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a ++ (b =:= c)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The following is the list of the declarations of the predefined operators:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:-op(1200,fx,['?-', ':-']).
:-op(1200,xfx,[':-','-->']).
:-op(1150,fx,[block,dynamic,mode,public,multifile,meta_predicate,
              sequential,table,initialization]).
:-op(1100,xfy,[';','|']).
:-op(1050,xfy,->).
:-op(1000,xfy,',').
:-op(999,xfy,'.').
:-op(900,fy,['\+', not]).
:-op(900,fx,[nospy, spy]).
:-op(700,xfx,[@>=,@=<,@<,@>,<,=,>,=:=,=\=,\==,>=,=<,==,\=,=..,is]).
:-op(500,yfx,['\/','/\','+','-']).
:-op(500,fx,['+','-']).
:-op(400,yfx,['<<','>>','//','*','/']).
:-op(300,xfx,mod).
:-op(200,xfy,['^','**']).
:-op(50,xfx,same).
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

*/

#define	xfx	1
#define	xfy	2
#define	yfx	3
#define	xf	4
#define	yf	5
#define	fx	6
#define	fy	7

int
Yap_IsOpType(char *type)
{
  int i;

  for (i = 1; i <= 7; ++i)
    if (strcmp(type, optypes[i]) == 0)
      break;
  return (i <= 7);
}

static int
OpDec(int p, const char *type, Atom a, Term m)
{
  int             i;
  AtomEntry      *ae = RepAtom(a);
  OpEntry        *info;

  if (m == TermProlog)
    m = PROLOG_MODULE;
  else if (m == USER_MODULE)
    m = PROLOG_MODULE;
  for (i = 1; i <= 7; ++i)
    if (strcmp(type, optypes[i]) == 0)
      break;
  if (i > 7) {
    Yap_Error(DOMAIN_ERROR_OPERATOR_SPECIFIER,MkAtomTerm(Yap_LookupAtom(type)),"op/3");
    return(FALSE);
  }
  if (p) {
    if (i == 1 || i == 2 || i == 4)
      p |= DcrlpFlag;
    if (i == 1 || i == 3 || i == 6)
      p |= DcrrpFlag;
  }
  WRITE_LOCK(ae->ARWLock);
  info = Yap_GetOpPropForAModuleHavingALock(ae, m);
  if (EndOfPAEntr(info)) {
    info = (OpEntry *) Yap_AllocAtomSpace(sizeof(OpEntry));
    info->KindOfPE = Ord(OpProperty);
    info->OpModule = m;
    info->OpName = a;
    //LOCK(OpListLock);
    info->OpNext = OpList;
    OpList = info;
    //UNLOCK(OpListLock);
    AddPropToAtom(ae, (PropEntry *)info);
    INIT_RWLOCK(info->OpRWLock);
    WRITE_LOCK(info->OpRWLock);
    WRITE_UNLOCK(ae->ARWLock);
    info->Prefix = info->Infix = info->Posfix = 0;
  } else {
    WRITE_LOCK(info->OpRWLock);
    WRITE_UNLOCK(ae->ARWLock);
  }
  if (i <= 3) {
    if (trueGlobalPrologFlag(ISO_FLAG) &&
	info->Posfix != 0) /* there is a posfix operator */ {
      /* ISO dictates */
      WRITE_UNLOCK(info->OpRWLock);
      Yap_Error(PERMISSION_ERROR_CREATE_OPERATOR,MkAtomTerm(a),"op/3");
      return FALSE;
    }
    info->Infix = p;
  } else if (i <= 5) {

    if (trueGlobalPrologFlag(ISO_FLAG) &&
	info->Infix != 0) /* there is an infix operator */ {
      /* ISO dictates */
      WRITE_UNLOCK(info->OpRWLock);
      Yap_Error(PERMISSION_ERROR_CREATE_OPERATOR,MkAtomTerm(a),"op/3");
      return FALSE;
    }
    info->Posfix = p;
  } else {
    info->Prefix = p;
  }
  WRITE_UNLOCK(info->OpRWLock);
  return (TRUE);
}

int
Yap_OpDec(int p, char *type, Atom a, Term m)
{
  return(OpDec(p,type,a,m));
}

static void
SetOp(int p, int type, char *at, Term m)
{
#if DEBUG
  if (GLOBAL_Option[5])
    fprintf(stderr,"[setop %d %s %s]\n", p, optypes[type], at);
#endif
  OpDec(p, optypes[type], Yap_LookupAtom(at), m);
}

/* Gets the info about an operator in a prop */
Atom
Yap_GetOp(OpEntry *pp, int *prio, int fix)
{
  int             n;
  SMALLUNSGN      p;

  if (fix == 0) {
    p = pp->Prefix;
    if (p & DcrrpFlag)
      n = 6, *prio = (p ^ DcrrpFlag);
    else
      n = 7, *prio = p;
  } else if (fix == 1) {
    p = pp->Posfix;
    if (p & DcrlpFlag)
      n = 4, *prio = (p ^ DcrlpFlag);
    else
      n = 5, *prio = p;
  } else {
    p = pp->Infix;
    if ((p & DcrrpFlag) && (p & DcrlpFlag))
      n = 1, *prio = (p ^ (DcrrpFlag | DcrlpFlag));
    else if (p & DcrrpFlag)
      n = 3, *prio = (p ^ DcrrpFlag);
    else if (p & DcrlpFlag)
      n = 2, *prio = (p ^ DcrlpFlag);
    else
      n = 4, *prio = p;
  }
  return Yap_LookupAtom(optypes[n]);
}

typedef struct OPSTRUCT {
	char           *opName;
	short int       opType, opPrio;
}               Opdef;

static Opdef    Ops[] = {
  {":-", xfx, 1200},
  {"-->", xfx, 1200},
  {"?-", fx, 1200},
  {":-", fx, 1200},
  {"dynamic", fx, 1150},
  {"thread_local", fx, 1150},
  {"initialization", fx, 1150},
  {"volatile", fx, 1150},
  {"mode", fx, 1150},
  {"public", fx, 1150},
  {"multifile", fx, 1150},
  {"meta_predicate", fx, 1150},
  {"module_transparent", fx, 1150},
  {"discontiguous", fx, 1150},
#ifdef YAPOR
  {"sequential", fx, 1150},
#endif /* YAPOR */
#ifdef TABLING
  {"table", fx, 1150},
#endif /* TABLING */
#ifndef UNCUTABLE
  {"uncutable", fx, 1150},
#endif /*UNCUTABLE ceh:*/
  {"|", xfy, 1105},
  {";", xfy, 1100},
  /*  {";", yf, 1100}, not allowed in ISO */
  {"->", xfy, 1050},
  {"*->", xfy, 1050},
  {",", xfy, 1000},
  {".", xfy, 999},
  {"\\+", fy, 900},
  {"not", fy, 900},
  {"=", xfx, 700},
  {"\\=", xfx, 700},
  {"is", xfx, 700},
  {"=..", xfx, 700},
  {"==", xfx, 700},
  {"\\==", xfx, 700},
  {"@<", xfx, 700},
  {"@>", xfx, 700},
  {"@=<", xfx, 700},
  {"@>=", xfx, 700},
  {"=@=", xfx, 700},
  {"\\=@=", xfx, 700},
  {"=:=", xfx, 700},
  {"=\\=", xfx, 700},
  {"<", xfx, 700},
  {">", xfx, 700},
  {"=<", xfx, 700},
  {">=", xfx, 700},
  {"as", xfx, 600},
  {":", xfy, 600},
  {"+", yfx, 500},
  {"-", yfx, 500},
  {"/\\", yfx, 500},
  {"\\/", yfx, 500},
  {"><", yfx, 500},
  {"#", yfx, 500},
  {"rdiv", yfx, 400},
  {"div", yfx, 400},
  {"xor", yfx, 400},
  {"*", yfx, 400},
  {"/", yfx, 400},
  {"//", yfx, 400},
  {"<<", yfx, 400},
  {">>", yfx, 400},
  {"mod", yfx, 400},
  {"rem", yfx, 400},
  {"+", fy, 200},
  {"-", fy, 200},
  {"\\", fy, 200},
  {"//", yfx, 400},
  {"**", xfx, 200},
  {"^", xfy, 200}
};

static void
InitOps(void)
{
  unsigned int             i;
  for (i = 0; i < sizeof(Ops) / sizeof(*Ops); ++i)
    SetOp(Ops[i].opPrio, Ops[i].opType, Ops[i].opName, PROLOG_MODULE);
}

/// @}

#if DEBUG
#ifdef HAVE_ISATTY
#include <unistd.h>
#endif
#endif

static void
InitDebug(void)
{
  Atom            At;
#if DEBUG
  int i;

  for (i = 1; i < 20; ++i)
    GLOBAL_Option[i] = 0;
  if (Yap_output_msg) {
    char            ch;

#if HAVE_ISATTY
    if (!isatty (0)) {
      return;
    }
#endif
    fprintf(stderr,"absmi address:%p\n", FunAdr(Yap_absmi));
    fprintf(stderr,"Set	Trace Options:\n");
    fprintf(stderr,"a getch\t\tb token\t\tc Lookup\td LookupVar\ti Index\n");
    fprintf(stderr,"e SetOp\t\tf compile\tg icode\t\th boot\t\tl log\n");
    fprintf(stderr,"m Machine\t p parser\n");
    while ((ch = YP_putchar(YP_getchar())) != '\n')
      if (ch >= 'a' && ch <= 'z')
	GLOBAL_Option[ch - 'a' + 1] = 1;
    if (GLOBAL_Option['l' - 96]) {
      GLOBAL_logfile = fopen(LOGFILE, "w");
      if (GLOBAL_logfile == NULL) {
	fprintf(stderr,"can not open %s\n", LOGFILE);
	getchar();
	exit(0);
      }
      fprintf(stderr,"logging session to file 'logfile'\n");
#ifdef MAC
      Yap_SetTextFile(LOGFILE);
      lp = my_line;
      curfile = Nill;
#endif
    }
  }
#endif
  /* Set at full leash */
  At = AtomLeash;
  Yap_PutValue(At, MkIntTerm(15));
}

static UInt
update_flags_from_prolog(UInt flags, PredEntry *pe)
{
  if (pe->PredFlags & MetaPredFlag)
    flags |= MetaPredFlag;
  if (pe->PredFlags & SourcePredFlag)
    flags |= SourcePredFlag;
  if (pe->PredFlags & SequentialPredFlag)
    flags |= SequentialPredFlag;
  if (pe->PredFlags & UDIPredFlag)
    flags |= UDIPredFlag;
  if (pe->PredFlags & ModuleTransparentPredFlag)
    flags |= ModuleTransparentPredFlag;
  if (pe->PredFlags & StandardPredFlag)
    flags |= StandardPredFlag;
  return flags;
}

void
Yap_InitCPred(const char *Name, UInt Arity, CPredicate code, pred_flags_t flags)
{
  CACHE_REGS
  Atom              atom = NIL;
  PredEntry        *pe = NULL;
  yamop            *p_code;
  StaticClause     *cl = NULL;
  Functor           f = NULL;

  while (atom == NIL) {
    if (flags & UserCPredFlag)
      atom = Yap_LookupAtom(Name);
    else
      atom = Yap_FullLookupAtom(Name);
    if (atom == NIL && !Yap_growheap(FALSE, 0L, NULL)) {
      Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
      return;
    }
  }
  if (Arity)  {
    while (!f) {
      f = Yap_MkFunctor(atom,Arity);
      if (!f && !Yap_growheap(FALSE, 0L, NULL)) {
	Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
	return;
      }
    }
  }
  while (pe == NULL) {
    if (Arity)
      pe = RepPredProp(PredPropByFunc(f,CurrentModule));
    else
      pe = RepPredProp(PredPropByAtom(atom,CurrentModule));
    if (!pe && !Yap_growheap(FALSE, sizeof(PredEntry), NULL)) {
      Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
      return;
    }
  }
  if (pe->PredFlags & CPredFlag) {
    /* already exists */
    flags = update_flags_from_prolog(flags, pe);
    cl = ClauseCodeToStaticClause(pe->CodeOfPred);
    if ((flags | StandardPredFlag | CPredFlag ) != pe->PredFlags) {
      Yap_ClauseSpace -= cl->ClSize;
      Yap_FreeCodeSpace((ADDR)cl);
      cl = NULL;
    }
  }
  p_code = cl->ClCode;
  while (!cl) {
    UInt sz;

    if (flags & SafePredFlag) {
      sz = (CELL)NEXTOP(NEXTOP(NEXTOP(p_code,Osbpp),p),l);
    } else {
      sz = (CELL)NEXTOP(NEXTOP(NEXTOP(NEXTOP(NEXTOP(p_code,e),p),Osbpp),p),l);
    }
    cl = (StaticClause *)Yap_AllocCodeSpace(sz);
    if (!cl) {
      if (!Yap_growheap(FALSE, sz, NULL)) {
	Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
	return;
      }
    } else {
      Yap_ClauseSpace += sz;
      cl->ClFlags = StaticMask;
      cl->ClNext = NULL;
      cl->ClSize = sz;
      cl->usc.ClLine = Yap_source_line_no();
      p_code = cl->ClCode;
    }
  }
  pe->CodeOfPred = p_code;
  pe->PredFlags = flags | StandardPredFlag | CPredFlag;
  pe->src.OwnerFile = Yap_ConsultingFile( PASS_REGS1 );
  pe->cs.f_code = code;
  if (!(flags & SafePredFlag)) {
    p_code->opc = Yap_opcode(_allocate);
    p_code = NEXTOP(p_code,e);
  }
  if (flags & UserCPredFlag)
    p_code->opc = Yap_opcode(_call_usercpred);
  else
    p_code->opc = Yap_opcode(_call_cpred);
  p_code->y_u.Osbpp.bmap = NULL;
  p_code->y_u.Osbpp.s = -Signed(RealEnvSize);
  p_code->y_u.Osbpp.p =
    p_code->y_u.Osbpp.p0 =
    pe;
  p_code = NEXTOP(p_code,Osbpp);
  if (!(flags & SafePredFlag)) {
    p_code->opc = Yap_opcode(_deallocate);
    p_code->y_u.p.p = pe;
    p_code = NEXTOP(p_code,p);
  }
  p_code->opc = Yap_opcode(_procceed);
  p_code->y_u.p.p = pe;
  p_code = NEXTOP(p_code,p);
  p_code->opc = Yap_opcode(_Ystop);
  p_code->y_u.l.l = cl->ClCode;
  pe->OpcodeOfPred = pe->CodeOfPred->opc;
}

bool
Yap_AddCallToFli( PredEntry *pe, CPredicate call )
{
  yamop            *p_code;
  
  if (pe->PredFlags & BackCPredFlag) {
    p_code = (yamop *)(pe->cs.p_code.FirstClause);
    p_code->y_u.OtapFs.f = call;
    return true;
  } else if (pe->PredFlags & CPredFlag) {
    pe->cs.f_code = call;
    return true;
  } else {
    return false;
  }
}

bool
Yap_AddRetryToFli( PredEntry *pe, CPredicate re )
{
  yamop            *p_code;
  
  if (pe->PredFlags & BackCPredFlag) {
    p_code = (yamop *)(pe->cs.p_code.FirstClause);
    p_code = NEXTOP(p_code,OtapFs);
    p_code->y_u.OtapFs.f = re;
    return true;
  } else {
    return false;
  }
}

bool
Yap_AddCutToFli( PredEntry *pe, CPredicate CUT )
{
  yamop            *p_code;
  
  if (pe->PredFlags & BackCPredFlag) {
    p_code = (yamop *)(pe->cs.p_code.FirstClause);
    p_code = NEXTOP(p_code,OtapFs);
    p_code = NEXTOP(p_code,OtapFs);
    p_code->y_u.OtapFs.f = CUT;
    return true;
  } else {
    return false;
  }
}

void
Yap_InitCmpPred(const char *Name, UInt Arity, CmpPredicate cmp_code, pred_flags_t flags)
{
  CACHE_REGS
  Atom              atom = NIL;
  PredEntry        *pe = NULL;
  yamop            *p_code = NULL;
  StaticClause     *cl = NULL;
  Functor           f = NULL;

  while (atom == NIL) {
    atom = Yap_FullLookupAtom(Name);
    if (atom == NIL && !Yap_growheap(FALSE, 0L, NULL)) {
      Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
      return;
    }
  }
  if (Arity)  {
    while (!f) {
      f = Yap_MkFunctor(atom,Arity);
      if (!f && !Yap_growheap(FALSE, 0L, NULL)) {
	Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
	return;
      }
    }
  }
  while (pe == NULL) {
    if (Arity)
      pe = RepPredProp(PredPropByFunc(f,CurrentModule));
    else
      pe = RepPredProp(PredPropByAtom(atom,CurrentModule));
    if (!pe && !Yap_growheap(FALSE, sizeof(PredEntry), NULL)) {
      Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
      return;
    }
  }
  if (pe->PredFlags & BinaryPredFlag) {
    flags = update_flags_from_prolog(flags, pe);
    p_code = pe->CodeOfPred;
    /* already exists */
  } else {
    while (!cl) {
      UInt sz = sizeof(StaticClause)+(CELL)NEXTOP(NEXTOP(NEXTOP(((yamop *)NULL),plxxs),p),l);
      cl = (StaticClause *)Yap_AllocCodeSpace(sz);
      if (!cl) {
	if (!Yap_growheap(FALSE, sz, NULL)) {
	  Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
	  return;
	}
      } else {
	Yap_ClauseSpace += sz;
	cl->ClFlags = StaticMask|StandardPredFlag;
	cl->ClNext = NULL;
	cl->ClSize = sz;
	cl->usc.ClLine = Yap_source_line_no();
	p_code = cl->ClCode;
	break;
      }
    }
  }
  //pe->PredFlags = flags | StandardPredFlag;
  pe->CodeOfPred = p_code;
  pe->cs.d_code = cmp_code;
  pe->ModuleOfPred = CurrentModule;
  p_code->opc = pe->OpcodeOfPred = Yap_opcode(_call_bfunc_xx);
  p_code->y_u.plxxs.p = pe;
  p_code->y_u.plxxs.f = FAILCODE;
  p_code->y_u.plxxs.x1 = Yap_emit_x(1);
  p_code->y_u.plxxs.x2 = Yap_emit_x(2);
  p_code->y_u.plxxs.flags = Yap_compile_cmp_flags(pe);
  p_code = NEXTOP(p_code,plxxs);
  p_code->opc = Yap_opcode(_procceed);
  p_code->y_u.p.p = pe;
  p_code = NEXTOP(p_code,p);
  p_code->opc = Yap_opcode(_Ystop);
  p_code->y_u.l.l = cl->ClCode;
}

void
Yap_InitAsmPred(const char *Name,  UInt Arity, int code, CPredicate def, pred_flags_t flags)
{
  CACHE_REGS
  Atom            atom = NIL;
  PredEntry      *pe = NULL;
  Functor           f = NULL;

  while (atom == NIL) {
    atom = Yap_FullLookupAtom(Name);
    if (atom == NIL && !Yap_growheap(FALSE, 0L, NULL)) {
      Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
      return;
    }
  }
  if (Arity)  {
    while (!f) {
      f = Yap_MkFunctor(atom,Arity);
      if (!f && !Yap_growheap(FALSE, 0L, NULL)) {
	Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
	return;
      }
    }
  }
  while (pe == NULL) {
    if (Arity)
      pe = RepPredProp(PredPropByFunc(f,CurrentModule));
    else
      pe = RepPredProp(PredPropByAtom(atom,CurrentModule));
    if (!pe && !Yap_growheap(FALSE, sizeof(PredEntry), NULL)) {
      Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
      return;
    }
  }
  flags |= AsmPredFlag | StandardPredFlag | (code);
  if (pe->PredFlags & AsmPredFlag) {
    flags = update_flags_from_prolog(flags, pe);
    /* already exists */
  }
  pe->PredFlags = flags;
  pe->cs.f_code =  def;
  pe->ModuleOfPred = CurrentModule;
  if (def != NULL) {
    yamop      *p_code = ((StaticClause *)NULL)->ClCode;
    StaticClause     *cl;

    if (pe->CodeOfPred == (yamop *)(&(pe->OpcodeOfPred))) {
      if (flags & SafePredFlag) {
	cl = (StaticClause *)Yap_AllocCodeSpace((CELL)NEXTOP(NEXTOP(NEXTOP(((yamop *)p_code),Osbpp),p),l));
      } else {
	cl = (StaticClause *)Yap_AllocCodeSpace((CELL)NEXTOP(NEXTOP(NEXTOP(NEXTOP(NEXTOP(((yamop *)p_code),e),Osbpp),p),p),l));
      }
      if (!cl) {
	Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"No Heap Space in InitAsmPred");
	return;
      }
      Yap_ClauseSpace += (CELL)NEXTOP(NEXTOP(NEXTOP(((yamop *)p_code),Osbpp),p),l);
    } else {
      cl = ClauseCodeToStaticClause(pe->CodeOfPred);
    }
    cl->ClFlags = StaticMask;
    cl->ClNext = NULL;
    if (flags & SafePredFlag) {
      cl->ClSize = (CELL)NEXTOP(NEXTOP(NEXTOP(((yamop *)p_code),Osbpp),e),e);
    } else {
      cl->ClSize = (CELL)NEXTOP(NEXTOP(NEXTOP(NEXTOP(NEXTOP(((yamop *)p_code),e),Osbpp),p),e),e);
    }
    cl->usc.ClLine = Yap_source_line_no();
    p_code = cl->ClCode;
    pe->CodeOfPred = p_code;
    if (!(flags & SafePredFlag)) {
      p_code->opc = Yap_opcode(_allocate);
      p_code = NEXTOP(p_code,e);
    }
    p_code->opc = Yap_opcode(_call_cpred);
    p_code->y_u.Osbpp.bmap = NULL;
    p_code->y_u.Osbpp.s = -Signed(RealEnvSize);
    p_code->y_u.Osbpp.p = p_code->y_u.Osbpp.p0 = pe;
    p_code = NEXTOP(p_code,Osbpp);
    if (!(flags & SafePredFlag)) {
      p_code->opc = Yap_opcode(_deallocate);
      p_code->y_u.p.p = pe;
      p_code = NEXTOP(p_code,p);
    }
    p_code->opc = Yap_opcode(_procceed);
    p_code->y_u.p.p = pe;
    p_code = NEXTOP(p_code,p);
    p_code->opc = Yap_opcode(_Ystop);
    p_code->y_u.l.l = cl->ClCode;
    pe->OpcodeOfPred = pe->CodeOfPred->opc;
  } else {
    pe->OpcodeOfPred = Yap_opcode(_undef_p);
    pe->CodeOfPred =  (yamop *)(&(pe->OpcodeOfPred));
  }
}


static void
CleanBack(PredEntry *pe, CPredicate Start, CPredicate Cont, CPredicate Cut)
{
  yamop   *code;
  if (pe->cs.p_code.FirstClause != pe->cs.p_code.LastClause ||
      pe->cs.p_code.TrueCodeOfPred != pe->cs.p_code.FirstClause ||
      pe->CodeOfPred != pe->cs.p_code.FirstClause) {
    Yap_Error(SYSTEM_ERROR,TermNil,
	      "initiating a C Pred with backtracking");
    return;
  }
  code = (yamop *)(pe->cs.p_code.FirstClause);
  code->y_u.OtapFs.p = pe;
  if (pe->PredFlags & UserCPredFlag)
    code->opc = Yap_opcode(_try_userc);
  else
    code->opc = Yap_opcode(_try_c);
#ifdef YAPOR
  INIT_YAMOP_LTT(code, 2);
  PUT_YAMOP_SEQ(code);
#endif /* YAPOR */
  code->y_u.OtapFs.f = Start;
  code = NEXTOP(code,OtapFs);
  if (pe->PredFlags & UserCPredFlag)
    code->opc = Yap_opcode(_retry_userc);
  else
    code->opc = Yap_opcode(_retry_c);
#ifdef YAPOR
  INIT_YAMOP_LTT(code, 1);
  PUT_YAMOP_SEQ(code);
#endif /* YAPOR */
  code->y_u.OtapFs.f = Cont;
  code = NEXTOP(code,OtapFs);
  if (pe->PredFlags & UserCPredFlag)
    code->opc = Yap_opcode(_cut_c);
  else
    code->opc = Yap_opcode(_cut_userc);
  code->y_u.OtapFs.p = pe;
  code->y_u.OtapFs.f = Cut;
}

void
Yap_InitCPredBack(const char *Name, UInt Arity,
		  unsigned int Extra, CPredicate Start,
		  CPredicate Cont, pred_flags_t flags){
  Yap_InitCPredBack_(Name,Arity,Extra,Start,Cont,NULL,flags);
}

void
Yap_InitCPredBackCut(const char *Name, UInt Arity,
		     unsigned int Extra, CPredicate Start,
		     CPredicate Cont,CPredicate Cut, pred_flags_t flags){
  Yap_InitCPredBack_(Name,Arity,Extra,Start,Cont,Cut,flags);
}

void
Yap_InitCPredBack_(const char *Name, UInt Arity,
		  unsigned int Extra, CPredicate Start,
		  CPredicate Cont, CPredicate Cut, pred_flags_t flags)
{
  CACHE_REGS
  PredEntry      *pe = NULL;
  Atom            atom = NIL;
  Functor           f = NULL;

  while (atom == NIL) {
    atom = Yap_FullLookupAtom(Name);
    if (atom == NIL && !Yap_growheap(FALSE, 0L, NULL)) {
      Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
      return;
    }
  }
  if (Arity)  {
    while (!f) {
      f = Yap_MkFunctor(atom,Arity);
      if (!f && !Yap_growheap(FALSE, 0L, NULL)) {
	Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
	return;
      }
    }
  }
  while (pe == NULL) {
    if (Arity)
      pe = RepPredProp(PredPropByFunc(f,CurrentModule));
    else
      pe = RepPredProp(PredPropByAtom(atom,CurrentModule));
    if (!pe && !Yap_growheap(FALSE, sizeof(PredEntry), NULL)) {
      Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"while initialising %s", Name);
      return;
    }
  }
  if (pe->cs.p_code.FirstClause != NIL)
    {
      flags = update_flags_from_prolog(flags, pe);
      CleanBack(pe, Start, Cont, Cut);
    }
  else {
    StaticClause *cl;
    yamop      *code = ((StaticClause *)NULL)->ClCode;
    UInt sz = (CELL)NEXTOP(NEXTOP(NEXTOP(NEXTOP(code,OtapFs),OtapFs),OtapFs),l);
    if (flags &  UserCPredFlag)
      pe->PredFlags = UserCPredFlag | BackCPredFlag| CompiledPredFlag | flags;
    else
      pe->PredFlags = CompiledPredFlag | StandardPredFlag | BackCPredFlag;

#ifdef YAPOR
    pe->PredFlags |= SequentialPredFlag;
#endif /* YAPOR */

    cl = (StaticClause *)Yap_AllocCodeSpace(sz);

    if (cl == NULL) {
      Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"No Heap Space in InitCPredBack");
      return;
    }
    cl->ClFlags = StaticMask;
    cl->ClNext = NULL;
    Yap_ClauseSpace += sz;
    cl->ClSize =
      (CELL)NEXTOP(NEXTOP(NEXTOP(NEXTOP(code,OtapFs),OtapFs),OtapFs),e);
    cl->usc.ClLine = Yap_source_line_no();

    code = cl->ClCode;
    pe->cs.p_code.TrueCodeOfPred = pe->CodeOfPred =
      pe->cs.p_code.FirstClause = pe->cs.p_code.LastClause = code;
    if (flags & UserCPredFlag)
      pe->OpcodeOfPred = code->opc = Yap_opcode(_try_userc);
    else
      pe->OpcodeOfPred = code->opc = Yap_opcode(_try_c);
    code->y_u.OtapFs.f = Start;
    code->y_u.OtapFs.p = pe;
    code->y_u.OtapFs.s = Arity;
    code->y_u.OtapFs.extra = Extra;
#ifdef YAPOR
    INIT_YAMOP_LTT(code, 2);
    PUT_YAMOP_SEQ(code);
#endif /* YAPOR */
    code = NEXTOP(code,OtapFs);
    if (flags & UserCPredFlag)
      code->opc = Yap_opcode(_retry_userc);
    else
      code->opc = Yap_opcode(_retry_c);
    code->y_u.OtapFs.f = Cont;
    code->y_u.OtapFs.p = pe;
    code->y_u.OtapFs.s = Arity;
    code->y_u.OtapFs.extra = Extra;
#ifdef YAPOR
    INIT_YAMOP_LTT(code, 1);
    PUT_YAMOP_SEQ(code);
#endif /* YAPOR */
    code = NEXTOP(code,OtapFs);
    if (flags & UserCPredFlag)
      code->opc = Yap_opcode(_cut_userc);
    else
      code->opc = Yap_opcode(_cut_c);
    code->y_u.OtapFs.f = Cut;
    code->y_u.OtapFs.p = pe;
    code->y_u.OtapFs.s = Arity;
    code->y_u.OtapFs.extra = Extra;
    code = NEXTOP(code,OtapFs);
    code->opc = Yap_opcode(_Ystop);
    code->y_u.l.l = cl->ClCode;
  }
}


static void
InitStdPreds(void)
{
  void initIO(void);

  Yap_InitCPreds();
  Yap_InitBackCPreds();
  BACKUP_MACHINE_REGS();
  Yap_InitYaamRegs( 0 );

#if HAVE_MPE
  Yap_InitMPE ();
#endif
  initIO();
}


static void
InitPredHash(void)
{
  UInt i;

  PredHash = (PredEntry **)Yap_AllocAtomSpace(sizeof(PredEntry **) * PredHashInitialSize);
  PredHashTableSize = PredHashInitialSize;
  if (PredHash == NULL) {
    Yap_Error(FATAL_ERROR,MkIntTerm(0),"allocating initial predicate hash table");
  }
  for (i = 0; i < PredHashTableSize; ++i) {
    PredHash[i] = NULL;
  }
  INIT_RWLOCK(PredHashRWLock);
}

static void
InitEnvInst(yamop start[2], yamop **instp, op_numbers opc, PredEntry *pred)
{
  yamop *ipc = start;

  /* make it look like the instruction is preceeded by a call instruction */
  ipc->opc = Yap_opcode(_call);
  ipc->y_u.Osbpp.s = -Signed(RealEnvSize);
  ipc->y_u.Osbpp.bmap = NULL;
  ipc->y_u.Osbpp.p = pred;
  ipc->y_u.Osbpp.p0 = pred;
  ipc = NEXTOP(ipc, Osbpp);
  ipc->opc = Yap_opcode(opc);
  *instp = ipc;
}

static void
InitOtaplInst(yamop start[1], OPCODE opc, PredEntry *pe)
{
  yamop *ipc = start;

  /* this is a place holder, it should not really be used */
  ipc->opc = Yap_opcode(opc);
  ipc->y_u.Otapl.s = 0;
  ipc->y_u.Otapl.p = pe;
  ipc->y_u.Otapl.d = NULL;
#ifdef YAPOR
  INIT_YAMOP_LTT(ipc, 1);
#endif /* YAPOR */
#ifdef TABLING
  ipc->y_u.Otapl.te = NULL;
#endif /* TABLING */
}

static void
InitDBErasedMarker(void)
{
  Yap_heap_regs->db_erased_marker =
    (DBRef)Yap_AllocCodeSpace(sizeof(DBStruct));
  Yap_LUClauseSpace += sizeof(DBStruct);
  Yap_heap_regs->db_erased_marker->id = FunctorDBRef;
  Yap_heap_regs->db_erased_marker->Flags = ErasedMask;
  Yap_heap_regs->db_erased_marker->Code = NULL;
  Yap_heap_regs->db_erased_marker->DBT.DBRefs = NULL;
  Yap_heap_regs->db_erased_marker->Parent = NULL;
}

static void
InitLogDBErasedMarker(void)
{
  Yap_heap_regs->logdb_erased_marker =
    (LogUpdClause *)Yap_AllocCodeSpace(sizeof(LogUpdClause)+(UInt)NEXTOP((yamop*)NULL,e));
  Yap_LUClauseSpace += sizeof(LogUpdClause)+(UInt)NEXTOP((yamop*)NULL,e);
  Yap_heap_regs->logdb_erased_marker->Id = FunctorDBRef;
  Yap_heap_regs->logdb_erased_marker->ClFlags = ErasedMask|LogUpdMask;
  Yap_heap_regs->logdb_erased_marker->lusl.ClSource = NULL;
  Yap_heap_regs->logdb_erased_marker->ClRefCount = 0;
  Yap_heap_regs->logdb_erased_marker->ClExt = NULL;
  Yap_heap_regs->logdb_erased_marker->ClPrev = NULL;
  Yap_heap_regs->logdb_erased_marker->ClNext = NULL;
  Yap_heap_regs->logdb_erased_marker->ClSize = (UInt)NEXTOP(((LogUpdClause *)NULL)->ClCode,e);
  Yap_heap_regs->logdb_erased_marker->ClCode->opc = Yap_opcode(_op_fail);
  INIT_CLREF_COUNT(Yap_heap_regs->logdb_erased_marker);
}

static void
InitSWIAtoms(void)
{
  /*  extern atom_t ATOM_;

  int j=0;
  MaxAtomTranslations = 2*N_SWI_ATOMS ;
  SWI_Atoms = (Atom *)malloc(sizeof(Atom)*MaxAtomTranslations);
  SWI_Functors = (Functor *)malloc(sizeof(Functor)*2*N_SWI_ATOMS);
#include "iswiatoms.h"
  Yap_InitSWIHash();
  ATOM_ = PL_new_atom("");
}

static void
InitEmptyWakeups(void)
{
}

static void
InitAtoms(void)
{
  int i;
  AtomHashTableSize = MaxHash;
  HashChain = (AtomHashEntry *)Yap_AllocAtomSpace(sizeof(AtomHashEntry) * MaxHash);
  if (HashChain == NULL) {
    Yap_Error(FATAL_ERROR,MkIntTerm(0),"allocating initial atom table");
  }
  for (i = 0; i < MaxHash; ++i) {
    INIT_RWLOCK(HashChain[i].AERWLock);
    HashChain[i].Entry = NIL;
  }
  NOfAtoms = 0;
#if OLD_STYLE_INITIAL_ATOMS
  Yap_LookupAtomWithAddress("**",(AtomEntry *)&(SF_STORE->AtFoundVar));
  Yap_ReleaseAtom(AtomFoundVar); 
  Yap_LookupAtomWithAddress("?",(AtomEntry *)&(SF_STORE->AtFreeTerm));
  Yap_ReleaseAtom(AtomFreeTerm);
  Yap_LookupAtomWithAddress("[]",(AtomEntry *)&(SF_STORE->AtNil));
  Yap_LookupAtomWithAddress(".",(AtomEntry *)&(SF_STORE->AtDot));
#else
  SF_STORE->AtFoundVar = Yap_LookupAtom("**");
  Yap_ReleaseAtom(AtomFoundVar); 
  SF_STORE->AtFreeTerm = Yap_LookupAtom("?");
  Yap_ReleaseAtom(AtomFreeTerm);
  SF_STORE->AtNil = Yap_LookupAtom("[]");
  SF_STORE->AtDot = Yap_LookupAtom(".");
#endif
}

static void
InitWideAtoms(void)
{
  int i;

  WideAtomHashTableSize = MaxWideHash;
  WideHashChain = (AtomHashEntry *)Yap_AllocAtomSpace(sizeof(AtomHashEntry) * MaxWideHash);
  if (WideHashChain == NULL) {
    Yap_Error(FATAL_ERROR,MkIntTerm(0),"allocating wide atom table");
  }
  for (i = 0; i < MaxWideHash; ++i) {
    INIT_RWLOCK(WideHashChain[i].AERWLock);
    WideHashChain[i].Entry = NIL;
  }
  NOfWideAtoms = 0;
}

static void
InitInvisibleAtoms(void)
{
  /* initialise invisible chain */
  Yap_heap_regs->invisiblechain.Entry = NIL;
  INIT_RWLOCK(Yap_heap_regs->invisiblechain.AERWLock);
}


#ifdef YAPOR
void Yap_init_yapor_workers(void) {
  CACHE_REGS
  int proc;
#ifdef YAPOR_THREADS
  return;
#endif /* YAPOR_THREADS */
#ifdef YAPOR_COW
  GLOBAL_master_worker = getpid();
  if (GLOBAL_number_workers > 1) {
    int son;
    son = fork();
    if (son == -1)
      Yap_Error(FATAL_ERROR, TermNil, "fork error (Yap_init_yapor_workers)");
    if (son > 0) {
      /* I am the father, I must stay here and wait for my children to all die */
      struct sigaction sigact;
      sigact.sa_handler = SIG_DFL;
      sigemptyset(&sigact.sa_mask);
      sigact.sa_flags = SA_RESTART;
      sigaction(SIGINT, &sigact, NULL);
      pause();
      exit(0);
    } else
      GLOBAL_worker_pid(0) = getpid();
  }
#endif /* YAPOR_COW */
  for (proc = 1; proc < GLOBAL_number_workers; proc++) {
    int son;
    son = fork();
    if (son == -1)
      Yap_Error(FATAL_ERROR, TermNil, "fork error (Yap_init_yapor_workers)");
    if (son == 0) {
      /* new worker */
      worker_id = proc;
      Yap_remap_yapor_memory();
      LOCAL = REMOTE(worker_id);
      memcpy(REMOTE(worker_id), REMOTE(0), sizeof(struct worker_local));
      InitWorker(worker_id);
      break;
    } else
      GLOBAL_worker_pid(proc) = son;
  }
}
#endif /* YAPOR */


#ifdef  THREADS
static void
InitThreadHandle(int wid)
{
  REMOTE_ThreadHandle(wid).in_use = FALSE;
  REMOTE_ThreadHandle(wid).zombie = FALSE;
  REMOTE_ThreadHandle(wid).local_preds = NULL;
#ifdef LOW_LEVEL_TRACER
  REMOTE_ThreadHandle(wid).thread_inst_count = 0LL;
#endif
  pthread_mutex_init(&(REMOTE_ThreadHandle(wid).tlock), NULL);
  pthread_mutex_init(&(REMOTE_ThreadHandle(wid).tlock_status), NULL);
  REMOTE_ThreadHandle(wid).tdetach = (CELL)0;
  REMOTE_ThreadHandle(wid).cmod = (CELL)0;
  {
    mbox_t * mboxp = &REMOTE_ThreadHandle(wid).mbox_handle;
  pthread_mutex_t *mutexp;
  pthread_cond_t *condp;
  struct idb_queue *msgsp;

  mboxp->name = MkIntTerm(0);
  condp = & mboxp->cond;
  pthread_cond_init(condp, NULL);
  mutexp = & mboxp->mutex;
  pthread_mutex_init(mutexp, NULL);
  msgsp = & mboxp->msgs;
  mboxp->nmsgs = 0;
  mboxp->nclients = 0;
  mboxp->open = true;
  Yap_init_tqueue(msgsp);
}

}

int
Yap_InitThread(int new_id)
{
  struct worker_local *new_s;
  if (new_id) {
    if (!(new_s = (struct worker_local *)calloc(sizeof(struct worker_local), 1)))
      return FALSE;
    Yap_local[new_id] = new_s;
    if (!((REGSTORE *)pthread_getspecific(Yap_yaamregs_key))) {
      REGSTORE *rs = (REGSTORE *)calloc(sizeof(REGSTORE),1);
      pthread_setspecific(Yap_yaamregs_key, (const void *)rs);
      REMOTE_ThreadHandle(new_id).default_yaam_regs = rs;
      REMOTE_ThreadHandle(new_id).current_yaam_regs = rs;
      rs->worker_id_ = new_id;
      rs->worker_local_ = REMOTE(new_id);
    }
  }
  InitWorker(new_id);
  return TRUE;
}
#endif

static void
InitScratchPad(int wid)
{
  REMOTE_ScratchPad(wid).ptr = NULL;
  REMOTE_ScratchPad(wid).sz = SCRATCH_START_SIZE;
  REMOTE_ScratchPad(wid).msz = SCRATCH_START_SIZE;
}

static CELL *
InitHandles(int wid) {
  size_t initial_slots = 1024;
  CELL *handles;

  REMOTE_CurSlot(wid) = 1;
  REMOTE_NSlots(wid)  = initial_slots;
  handles = malloc(initial_slots * sizeof(CELL));

  if(handles == NULL) {
    Yap_Error(SYSTEM_ERROR, 0 /* TermNil */, "No space for handles at " __FILE__ " : %d", __LINE__);
  }

  RESET_VARIABLE(handles);
  return handles;
}

void
Yap_CloseScratchPad(void)
{
  CACHE_REGS
  Yap_FreeCodeSpace(LOCAL_ScratchPad.ptr);
  LOCAL_ScratchPad.sz = SCRATCH_START_SIZE;
  LOCAL_ScratchPad.msz = SCRATCH_START_SIZE;
}

#include "iglobals.h"
#include "ilocals.h"


#if defined(YAPOR_COPY) || defined(YAPOR_COW) || defined(YAPOR_SBA)
struct global_data *Yap_global;
long Yap_worker_area_size;
#else
struct global_data Yap_Global;
#endif

#if defined(THREADS)
struct worker_local	*Yap_local[MAX_THREADS];
#elif defined(YAPOR)
struct worker_local	*Yap_local;
#else /* !THREADS && !YAPOR */
struct worker_local	Yap_local;
#endif

static void
InitCodes(void)
{
  CACHE_REGS
#if THREADS
  int wid;
  for (wid = 1; wid < MAX_THREADS; wid++) {
    Yap_local[wid] = NULL;
  }
#endif
#include "ihstruct.h"
#if THREADS
  Yap_InitThread(0);
#endif /* THREADS */
  InitGlobal();
#if !THREADS
  InitWorker(0);
#endif /* THREADS */
  Yap_InitFirstWorkerThreadHandle();
  /* make sure no one else can use these two atoms */
  LOCAL_SourceModule = CurrentModule = 0;
  Yap_ReleaseAtom(AtomOfTerm(TermReFoundVar));
  /* make sure we have undefp defined */
  /* predicates can only be defined after this point */
  {
    /* make sure we know about the module predicate */
    PredEntry *modp = RepPredProp(PredPropByFunc(FunctorModule,PROLOG_MODULE));
    modp->PredFlags |= MetaPredFlag;
  }
#ifdef YAPOR
  Yap_heap_regs->getwork_code->y_u.Otapl.p = RepPredProp(PredPropByAtom(AtomGetwork, PROLOG_MODULE));
  Yap_heap_regs->getwork_seq_code->y_u.Otapl.p = RepPredProp(PredPropByAtom(AtomGetworkSeq, PROLOG_MODULE));
#endif /* YAPOR */

}


static void
InitVersion(void)
{
  Yap_PutValue(AtomVersionNumber,
	       MkAtomTerm(Yap_LookupAtom(YAP_FULL_VERSION)));
}

void
Yap_InitWorkspace(UInt Heap, UInt Stack, UInt Trail, UInt Atts, UInt max_table_size,
                  int n_workers, int sch_loop, int delay_load)
{
  CACHE_REGS
  int             i;

  /* initialise system stuff */
#if PUSH_REGS
#ifdef THREADS
  if (!(Yap_local[0] = (struct worker_local *)calloc(sizeof(struct worker_local), 1)))
    return;
  pthread_key_create(&Yap_yaamregs_key, NULL);
  pthread_setspecific(Yap_yaamregs_key, (const void *)&Yap_standard_regs);
  GLOBAL_master_thread = pthread_self();
#else
  /* In this case we need to initialise the abstract registers */
  Yap_regp = &Yap_standard_regs;
  /* the emulator will eventually copy them to its own local
     register array, but for now they exist */
#endif
#endif /* PUSH_REGS */

#ifdef THREADS
  Yap_regp = ((REGSTORE *)pthread_getspecific(Yap_yaamregs_key));
  LOCAL = REMOTE(0);
#endif /* THREADS */
#if defined(YAPOR_COPY) || defined(YAPOR_COW) || defined(YAPOR_SBA)
  LOCAL = REMOTE(0);
#endif /* YAPOR_COPY || YAPOR_COW || YAPOR_SBA */
  if (Heap < MinHeapSpace)
    Heap = MinHeapSpace;
  Heap = AdjustPageSize(Heap * K);
  Heap /= (K);
  /* sanity checking for data areas */
  if (Trail < MinTrailSpace)
    Trail = MinTrailSpace;
  Trail = AdjustPageSize(Trail * K);
  Trail /= (K);
  if (Stack < MinStackSpace)
    Stack = MinStackSpace;
  Stack = AdjustPageSize(Stack * K);
  Stack /= (K);
  if (!Atts)
    Atts = 2048*sizeof(CELL);
  else
    Atts = AdjustPageSize(Atts * K);
  Atts /= (K);
#if defined(THREADS) || defined(YAPOR)
  worker_id = 0;
#endif /* YAPOR || THREADS */
#ifdef YAPOR
  if (n_workers > MAX_WORKERS)
    Yap_Error(INTERNAL_ERROR, TermNil, "excessive number of workers");
#ifdef YAPOR_COPY
  INFORMATION_MESSAGE("YapOr: copy model with %d worker%s", n_workers, n_workers == 1 ? "":"s");
#elif YAPOR_COW
  INFORMATION_MESSAGE("YapOr: acow model with %d worker%s", n_workers, n_workers == 1 ? "":"s");
#elif YAPOR_SBA
  INFORMATION_MESSAGE("YapOr: sba model with %d worker%s", n_workers, n_workers == 1 ? "":"s");
#elif YAPOR_THREADS
  INFORMATION_MESSAGE("YapOr: threads model with %d worker%s", n_workers, n_workers == 1 ? "":"s");
#endif /* YAPOR_COPY - YAPOR_COW - YAPOR_SBA - YAPOR_THREADS */
#endif /* YAPOR */
#if defined(YAPOR_COPY) || defined(YAPOR_COW) || defined(YAPOR_SBA)
  Yap_init_yapor_stacks_memory(Trail, Heap, Stack+Atts, n_workers);
#else
  Yap_InitMemory(Trail, Heap, Stack+Atts);
#endif
#if defined(YAPOR) || defined(TABLING)
  Yap_init_global_optyap_data(max_table_size, n_workers, sch_loop, delay_load);
#endif /* YAPOR || TABLING */

  Yap_AttsSize = Atts;
  Yap_InitTime( 0 );
  /* InitAbsmi must be done before InitCodes */
  /* This must be done before initialising predicates */
  for (i = 0; i < NUMBER_OF_YAP_FLAGS; i++) {
    yap_flags[i] = 0;
  }
#ifdef MPW
  Yap_InitAbsmi(REGS, FunctorList);
#else
  Yap_InitAbsmi();
#endif
  InitCodes();
  InitOps();
  InitDebug();
  InitVersion();
#if THREADS
  /* make sure we use the correct value of regcache */
  regcache =  ((REGSTORE *)pthread_getspecific(Yap_yaamregs_key));
  LOCAL_PL_local_data_p->reg_cache = regcache;
#endif
#if USE_SYSTEM_MALLOC
  if (Trail < MinTrailSpace)
    Trail = MinTrailSpace;
  if (Stack < MinStackSpace)
    Stack = MinStackSpace;
  if (!(LOCAL_GlobalBase = (ADDR)malloc((Trail+Stack)*1024))) {
    Yap_Error(RESOURCE_ERROR_MEMORY, 0, "could not allocate stack space for main thread");
    Yap_exit(1);
  }
#if THREADS
  /* don't forget this is a thread */
  LOCAL_ThreadHandle.stack_address =  LOCAL_GlobalBase;
  LOCAL_ThreadHandle.tsize =  Trail;
  LOCAL_ThreadHandle.ssize =  Stack;
#endif
#endif
  GLOBAL_AllowGlobalExpansion = TRUE;
  GLOBAL_AllowLocalExpansion = TRUE;
  GLOBAL_AllowTrailExpansion = TRUE;
  Yap_InitExStacks (0, Trail, Stack);
  InitStdPreds();
  /* make sure tmp area is available */
  {
    Yap_ReleasePreAllocCodeSpace(Yap_PreAllocCodeSpace());
  }
}

int
Yap_HaltRegisterHook (HaltHookFunc f, void * env)
{
  struct halt_hook *h;

  if (!(h = (struct halt_hook *)Yap_AllocCodeSpace(sizeof(struct halt_hook))))
    return FALSE;
  h->environment = env;
  h->hook = f;
  LOCK(GLOBAL_BGL);
  h->next = GLOBAL_HaltHooks;
  GLOBAL_HaltHooks = h;
  UNLOCK(GLOBAL_BGL);
  return TRUE;
}

static void
run_halt_hooks(int code)
{
  struct halt_hook *hooke = GLOBAL_HaltHooks;

  while (hooke) {
    hooke->hook(code, hooke->environment);
    hooke = hooke->next;
  }
}

void
Yap_exit (int value)
{
  CACHE_REGS
  void closeFiles(int all);
#if defined(YAPOR_COPY) || defined(YAPOR_COW) || defined(YAPOR_SBA)
  Yap_unmap_yapor_memory();
#endif /* YAPOR_COPY || YAPOR_COW || YAPOR_SBA */

  if (! (LOCAL_PrologMode & BootMode) ) {
#ifdef LOW_PROF
    remove("PROFPREDS");
    remove("PROFILING");
#endif
    run_halt_hooks(value);
    Yap_ShutdownLoadForeign();
  }
  closeFiles(TRUE);
  exit(value);
}