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/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: jan@swi.psy.uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2002, University of Amsterdam
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pl-incl.h"
typedef enum flag_type
{ FLG_ATOM,
FLG_INTEGER,
FLG_FLOAT
} flag_type;
typedef struct flag
{ word key; /* key to the flag */
int type; /* type (atom, int, float */
union
{ atom_t a; /* atom */
int64_t i; /* integer */
double f; /* float */
} value; /* value of the flag */
} *Flag;
#define flagTable (GD->flags.table)
#define LOCK() PL_LOCK(L_FLAG)
#define UNLOCK() PL_UNLOCK(L_FLAG)
#undef LD
#define LD LOCAL_LD
void
initFlags(void)
{ flagTable = newHTable(FLAGHASHSIZE);
}
static Flag
lookupFlag(word key ARG_LD)
{ Symbol symb;
Flag f;
if ( (symb = lookupHTable(flagTable, (void *)key)) )
return (Flag)symb->value;
f = (Flag) allocHeap(sizeof(struct flag));
f->key = key;
if ( isTextAtom(key) )
PL_register_atom(key);
f->type = FLG_INTEGER;
f->value.i = 0;
addHTable(flagTable, (void *)key, f);
return f;
}
static void
freeFlagValue(Flag f)
{ if ( f->type == FLG_ATOM )
PL_unregister_atom(f->value.a);
}
static
PRED_IMPL("flag", 3, flag, PL_FA_TRANSPARENT)
{ PRED_LD
Flag f;
word key;
atom_t a;
number n;
word rval;
term_t name = A1;
term_t old = A2;
term_t new = A3;
if ( !getKeyEx(name, &key PASS_LD) )
fail;
rval = FALSE;
LOCK();
f = lookupFlag(key PASS_LD);
switch(f->type)
{ case FLG_ATOM:
if ( !PL_unify_atom(old, f->value.a) )
goto out;
break;
case FLG_INTEGER:
if ( !PL_unify_int64(old, f->value.i) )
goto out;
break;
case FLG_FLOAT:
{
#ifdef DOUBLE_ALIGNMENT
double v;
doublecpy(&v, &f->value.f);
if ( !PL_unify_float(old, v) )
goto out;
#else
if ( !PL_unify_float(old, f->value.f) )
goto out;
#endif
break;
}
default:
assert(0);
}
rval = TRUE;
if ( PL_get_atom(new, &a) )
{ freeFlagValue(f);
f->type = FLG_ATOM;
f->value.a = a;
PL_register_atom(a);
} else if ( valueExpression(new, &n PASS_LD) )
{ switch(n.type)
{ case V_INTEGER:
{ freeFlagValue(f);
f->type = FLG_INTEGER;
f->value.i = n.value.i;
break;
}
#ifdef O_GMP
case V_MPZ:
case V_MPQ:
goto type_error;
#endif
case V_FLOAT:
{ freeFlagValue(f);
f->type = FLG_FLOAT;
#ifdef DOUBLE_ALIGNMENT
doublecpy(&f->value.f, &n.value.f);
#else
f->value.f = n.value.f;
#endif
break;
}
}
} else
{
#ifdef O_GMP
type_error:
#endif
rval = PL_error("flag", 3, NULL, ERR_TYPE, ATOM_flag_value, new);
}
out:
UNLOCK();
return rval;
}
word
pl_current_flag(term_t k, control_t h)
{ GET_LD
Symbol symb;
TableEnum e;
switch( ForeignControl(h) )
{ case FRG_FIRST_CALL:
{ word key;
if ( PL_is_variable(k) )
{ e = newTableEnum(flagTable);
break;
}
if ( getKeyEx(k, &key PASS_LD) &&
lookupHTable(flagTable, (void *)key) )
succeed;
fail;
}
case FRG_REDO:
e = ForeignContextPtr(h);
break;
case FRG_CUTTED:
e = ForeignContextPtr(h);
freeTableEnum(e);
default:
succeed;
}
while( (symb = advanceTableEnum(e)) )
{ Flag f = symb->value;
if ( !unifyKey(k, f->key) )
continue;
ForeignRedoPtr(e);
}
freeTableEnum(e);
fail;
}
/*******************************
* PUBLISH PREDICATES *
*******************************/
BeginPredDefs(flag)
PRED_DEF("flag", 3, flag, PL_FA_TRANSPARENT)
EndPredDefs
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