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/*
* ALSA lisp implementation
* Copyright (c) 2003 by Jaroslav Kysela <perex@perex.cz>
*
* Based on work of Sandro Sigala (slisp-1.2)
*
*
* 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 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 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 "list.h"
enum alisp_tokens {
ALISP_IDENTIFIER,
ALISP_INTEGER,
ALISP_FLOAT,
ALISP_FLOATE,
ALISP_STRING
};
enum alisp_objects {
ALISP_OBJ_INTEGER,
ALISP_OBJ_FLOAT,
ALISP_OBJ_IDENTIFIER,
ALISP_OBJ_STRING,
ALISP_OBJ_POINTER,
ALISP_OBJ_CONS,
ALISP_OBJ_LAST_SEARCH = ALISP_OBJ_CONS,
ALISP_OBJ_NIL,
ALISP_OBJ_T,
};
struct alisp_object;
#define ALISP_TYPE_MASK 0xf0000000
#define ALISP_TYPE_SHIFT 28
#define ALISP_REFS_MASK 0x0fffffff
#define ALISP_REFS_SHIFT 0
#define ALISP_MAX_REFS (ALISP_REFS_MASK>>ALISP_REFS_SHIFT)
#define ALISP_MAX_REFS_LIMIT ((ALISP_MAX_REFS + 1) / 2)
struct alisp_object {
struct list_head list;
unsigned int type_refs; /* type and count of references */
union {
char *s;
long i;
double f;
const void *ptr;
struct {
struct alisp_object *car;
struct alisp_object *cdr;
} c;
} value;
};
static inline enum alisp_objects alisp_get_type(struct alisp_object *p)
{
return (p->type_refs >> ALISP_TYPE_SHIFT);
}
static inline void alisp_set_type(struct alisp_object *p, enum alisp_objects type)
{
p->type_refs &= ~ALISP_TYPE_MASK;
p->type_refs |= (unsigned int)type << ALISP_TYPE_SHIFT;
}
static inline int alisp_compare_type(struct alisp_object *p, enum alisp_objects type)
{
return ((unsigned int)type << ALISP_TYPE_SHIFT) ==
(p->type_refs & ALISP_TYPE_MASK);
}
static inline void alisp_set_refs(struct alisp_object *p, unsigned int refs)
{
p->type_refs &= ~ALISP_REFS_MASK;
p->type_refs |= refs & ALISP_REFS_MASK;
}
static inline unsigned int alisp_get_refs(struct alisp_object *p)
{
return p->type_refs & ALISP_REFS_MASK;
}
static inline unsigned int alisp_inc_refs(struct alisp_object *p)
{
unsigned r = alisp_get_refs(p) + 1;
alisp_set_refs(p, r);
return r;
}
static inline unsigned int alisp_dec_refs(struct alisp_object *p)
{
unsigned r = alisp_get_refs(p) - 1;
alisp_set_refs(p, r);
return r;
}
struct alisp_object_pair {
struct list_head list;
const char *name;
struct alisp_object *value;
};
#define ALISP_LEX_BUF_MAX 16
#define ALISP_OBJ_PAIR_HASH_SHIFT 4
#define ALISP_OBJ_PAIR_HASH_SIZE (1<<ALISP_OBJ_PAIR_HASH_SHIFT)
#define ALISP_OBJ_PAIR_HASH_MASK (ALISP_OBJ_PAIR_HASH_SIZE-1)
#define ALISP_FREE_OBJ_POOL 512 /* free objects above this pool */
struct alisp_instance {
int verbose: 1,
warning: 1,
debug: 1;
/* i/o */
snd_input_t *in;
snd_output_t *out;
snd_output_t *eout; /* error output */
snd_output_t *vout; /* verbose output */
snd_output_t *wout; /* warning output */
snd_output_t *dout; /* debug output */
/* lexer */
int charno;
int lineno;
int lex_buf[ALISP_LEX_BUF_MAX];
int *lex_bufp;
char *token_buffer;
int token_buffer_max;
int thistoken;
/* object allocator / storage */
long free_objs;
long used_objs;
long max_objs;
struct list_head free_objs_list;
struct list_head used_objs_list[ALISP_OBJ_PAIR_HASH_SIZE][ALISP_OBJ_LAST_SEARCH + 1];
/* set object */
struct list_head setobjs_list[ALISP_OBJ_PAIR_HASH_SIZE];
};
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