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/*
Clif - A C-like Interpreter Framework
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997 T. Hruz, L. Koren
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* remote_call.c
*
* Maintenance functions for calling remote functions.
*/
#include <stdio.h>
#include "allocx.h"
#include "printfx.h"
#include "global.h"
#include "intrinsic.h"
#include "load.c"
#include "remote_call.h"
static int hash_code_remote PROTO((char *));
static void putstruct_remote PROTO((struct remote_has_tab *, char *, int));
/* Looks up the hash table of remote functions. */
static struct remote_has_tab *lookup_remote PROTO((char *s));
/* \verbatim{remote_call_c_hastab_remote.tex} */
struct remote_has_tab *hastab_remote;
/* \verbatim */
static int remote_offset_counter = 0; /* Counter for remote function */
/* offset. */
/*
* Checks the table if a function is in.
* If not it saves all needed information.
*/
void
has_remote (x)
struct remote_tab *x;
{
struct remote_has_tab *np, *arch;
while (x != NULL)
{
if (NULL == lookup_remote (x->name))
/* The function is not in the table. */
{
#ifdef DEBUG
printfx("Including new remote function\n");
printfx("hash code:%u\n",hash_code_remote(x->name));
#endif
f[remote_offset_counter] = (INTRINSIC_FUNCTION)x->adr;
np = hastab_remote + hash_code_remote (x->name);
if(np->name == NULL) /* There is no list. */
{
putstruct_remote (np, x->name, remote_offset_counter);
x = x->next;
remote_offset_counter++;
}
else /* There is a list. */
{
do
{
arch=np;
np=np->next;
}
while(np != NULL);
np = (struct remote_has_tab *) allocate (sizeof(struct
remote_has_tab), PERM);
arch->next = np;
putstruct_remote (np, x->name, remote_offset_counter);
x = x->next;
remote_offset_counter++;
}
arch = NULL;
}
else /* The function is in the table. */
{
error_message (1006);
}
}
}
/*
* Saves useful information about functions
* and connect the information with the
* function name.
*/
static void
putstruct_remote (np, name, i)
struct remote_has_tab *np;
char *name;
int i;
{
np->name = name;
#ifdef DEBUG
printfx("function's name %s is stored\n",np->name);
#endif
np->offset = i;
#ifdef DEBUG
printfx("offset:%u is in table\n",np->offset);
#endif
}
/*
* Looks up the hash table of remote functions.
*/
static struct remote_has_tab *
lookup_remote (s)
char *s;
{
struct remote_has_tab *ps;
ps = hastab_remote + hash_code_remote (s);
if(*(int *)ps == 0)
return(NULL);
while ((ps->name != s) && (ps->next != NULL))
ps = ps->next;
if ((ps->next == NULL) && (ps->name != s))
return (NULL);
else
return (ps);
}
/*
* Hash function.
*/
static int
hash_code_remote (s)
char *s;
{
int c = 0;
while(*s)
{
c = c<<1^(*s);
s++;
}
if (c<0)
c = (-c);
return (c % SIZE_REMOTE);
}
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