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/*
* Pure Data Packet system implementation. : code implementing pdp's namespace (symbols)
* Copyright (c) by Tom Schouten <tom@zwizwa.be>
*
* 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.
*
*/
#include <string.h>
#include <pthread.h>
#include "pdp_symbol.h"
#include "pdp_list.h"
#include "pdp_debug.h"
// some extra prototypes
void *pdp_alloc(int size);
void pdp_dealloc(void *data);
// the symbol hash mutex
static pthread_mutex_t pdp_hash_mutex;
#define HASHSIZE 1024
static t_pdp_symbol *pdp_symhash[HASHSIZE];
#define LOCK pthread_mutex_lock(&pdp_hash_mutex)
#define UNLOCK pthread_mutex_unlock(&pdp_hash_mutex)
static void _pdp_symbol_init(t_pdp_symbol *s)
{
memset(s, 0, sizeof(*s));
s->s_forth.t = a_undef;
}
/* shamelessly copied from pd src and made thread safe */
t_pdp_symbol *_pdp_dogensym(char *s, t_pdp_symbol *oldsym)
{
t_pdp_symbol **sym1, *sym2;
unsigned int hash1 = 0, hash2 = 0;
int length = 0;
char *s2 = s;
while (*s2)
{
hash1 += *s2;
hash2 += hash1;
length++;
s2++;
}
sym1 = pdp_symhash + (hash2 & (HASHSIZE-1));
/* lock hash */
LOCK;
while (sym2 = *sym1)
{
if (!strcmp(sym2->s_name, s)) goto gotit;
sym1 = &sym2->s_next;
}
if (oldsym){
sym2 = oldsym;
}
else
{
sym2 = (t_pdp_symbol *)pdp_alloc(sizeof(*sym2));
_pdp_symbol_init(sym2);
sym2->s_name = pdp_alloc(length+1);
sym2->s_next = 0;
strcpy(sym2->s_name, s);
}
*sym1 = sym2;
gotit:
/* unlock hash */
UNLOCK;
return (sym2);
}
t_pdp_symbol *pdp_gensym(char *s)
{
return(_pdp_dogensym(s, 0));
}
/* connect a parsed typelist to a symbol type name
1 = succes, 0 = error (symbol already connected) */
int pdp_symbol_set_typelist(t_pdp_symbol *s, t_pdp_list *typelist)
{
int status = 0;
LOCK;
if (!s->s_type){
s->s_type = typelist;
status = 1;
}
UNLOCK;
return status;
}
void pdp_symbol_apply_all(t_pdp_symbol_iterator it)
{
int i;
for (i=0; i<HASHSIZE; i++){
t_pdp_symbol *s;
for (s = pdp_symhash[i]; s; s=s->s_next){
it(s);
}
}
}
t_pdp_symbol _pdp_sym_wildcard;
t_pdp_symbol _pdp_sym_float;
t_pdp_symbol _pdp_sym_int;
t_pdp_symbol _pdp_sym_symbol;
t_pdp_symbol _pdp_sym_packet;
t_pdp_symbol _pdp_sym_pointer;
t_pdp_symbol _pdp_sym_invalid;
t_pdp_symbol _pdp_sym_list;
t_pdp_symbol _pdp_sym_question_mark;
t_pdp_symbol _pdp_sym_atom;
t_pdp_symbol _pdp_sym_null;
t_pdp_symbol _pdp_sym_quote_start;
t_pdp_symbol _pdp_sym_quote_end;
t_pdp_symbol _pdp_sym_return;
t_pdp_symbol _pdp_sym_nreturn;
t_pdp_symbol _pdp_sym_defstart;
t_pdp_symbol _pdp_sym_defend;
t_pdp_symbol _pdp_sym_if;
t_pdp_symbol _pdp_sym_then;
t_pdp_symbol _pdp_sym_local;
t_pdp_symbol _pdp_sym_forth;
t_pdp_symbol _pdp_sym_call;
t_pdp_symbol _pdp_sym_push;
t_pdp_symbol _pdp_sym_pop;
static void _sym(char *name, t_pdp_symbol *s)
{
t_pdp_symbol *realsym;
_pdp_symbol_init(s);
s->s_name = name;
realsym = _pdp_dogensym(name, s);
PDP_ASSERT(realsym == s); // if this fails, the symbol was already defined
}
void pdp_symbol_setup(void)
{
// create mutexes
pthread_mutex_init(&pdp_hash_mutex, NULL);
// init symbol hash
memset(pdp_symhash, 0, HASHSIZE * sizeof(t_pdp_symbol *));
// setup predefined symbols (those that have direct pointer access for speedup)
_sym("*", &_pdp_sym_wildcard);
_sym("float", &_pdp_sym_float);
_sym("int", &_pdp_sym_int);
_sym("symbol", &_pdp_sym_symbol);
_sym("packet", &_pdp_sym_packet);
_sym("pointer", &_pdp_sym_pointer);
_sym("invalid", &_pdp_sym_invalid);
_sym("list", &_pdp_sym_list);
_sym("?", &_pdp_sym_question_mark);
_sym("atom", &_pdp_sym_atom);
_sym("null", &_pdp_sym_null);
_sym("[", &_pdp_sym_quote_start);
_sym("]", &_pdp_sym_quote_end);
_sym("ret", &_pdp_sym_return);
_sym("nret", &_pdp_sym_nreturn);
_sym(":", &_pdp_sym_defstart);
_sym(";", &_pdp_sym_defend);
_sym("if", &_pdp_sym_if);
_sym("then", &_pdp_sym_then);
_sym("local", &_pdp_sym_local);
_sym("forth", &_pdp_sym_forth);
_sym("call", &_pdp_sym_call);
_sym("push", &_pdp_sym_push);
_sym("pop", &_pdp_sym_pop);
}
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