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/*
* Copyright © 2016 Keith Packard <keithp@keithp.com>
*
* 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.
*/
#ifndef _AO_LISP_H_
#define _AO_LISP_H_
#include <stdint.h>
#include <string.h>
#include <stdio.h>
# define AO_LISP_CONS 0
# define AO_LISP_INT 1
# define AO_LISP_STRING 2
# define AO_LISP_OTHER 3
# define AO_LISP_ATOM 4
# define AO_LISP_BUILTIN 5
# define AO_LISP_NIL 0
#define AO_LISP_POOL 1024
#define AO_LISP_ROOT 16
static inline void *ao_lisp_set_ref(void *addr) {
return (void *) ((intptr_t)addr | 1);
}
static inline void *ao_lisp_clear_ref(void *addr) {
return (void *) ((intptr_t)addr & ~1);
}
extern uint8_t ao_lisp_pool[AO_LISP_POOL];
struct ao_lisp_mem_type {
void (*mark)(void *addr);
int (*size)(void *addr);
void (*move)(void *addr);
};
typedef intptr_t ao_lisp_poly;
struct ao_lisp_cons {
ao_lisp_poly car;
struct ao_lisp_cons *cdr;
};
struct ao_lisp_atom {
uint8_t type;
ao_lisp_poly val;
struct ao_lisp_atom *next;
char name[];
};
#define AO_LISP_ATOM_CONST ((struct ao_lisp_atom *) (intptr_t) 1)
extern const struct ao_lisp_atom *ao_lisp_builtins[];
struct ao_lisp_builtin {
uint8_t type;
ao_lisp_poly (*func)(struct ao_lisp_cons *cons);
char name[];
};
static inline void *
ao_lisp_poly_other(ao_lisp_poly poly) {
return (void *) (poly - AO_LISP_OTHER);
}
static const inline ao_lisp_poly
ao_lisp_other_poly(const void *other)
{
return (ao_lisp_poly) other + AO_LISP_OTHER;
}
#define AO_LISP_OTHER_POLY(other) ((ao_lisp_poly)(other) + AO_LISP_OTHER)
static inline int ao_lisp_poly_type(ao_lisp_poly poly) {
int type = poly & 3;
if (type == AO_LISP_OTHER)
return *((uint8_t *) ao_lisp_poly_other(poly));
return type;
}
static inline struct ao_lisp_cons *
ao_lisp_poly_cons(ao_lisp_poly poly)
{
return (struct ao_lisp_cons *) (poly - AO_LISP_CONS);
}
static inline ao_lisp_poly
ao_lisp_cons_poly(struct ao_lisp_cons *cons)
{
return (ao_lisp_poly) cons + AO_LISP_CONS;
}
static inline int
ao_lisp_poly_int(ao_lisp_poly poly)
{
return (int) (poly >> 2);
}
static inline ao_lisp_poly
ao_lisp_int_poly(int i)
{
return ((ao_lisp_poly) i << 2) + AO_LISP_INT;
}
static inline char *
ao_lisp_poly_string(ao_lisp_poly poly)
{
return (char *) (poly - AO_LISP_STRING);
}
static inline ao_lisp_poly
ao_lisp_string_poly(char *s) {
return (ao_lisp_poly) s + AO_LISP_STRING;
}
static inline struct ao_lisp_atom *
ao_lisp_poly_atom(ao_lisp_poly poly)
{
return (struct ao_lisp_atom *) (poly - AO_LISP_OTHER);
}
static inline ao_lisp_poly
ao_lisp_atom_poly(struct ao_lisp_atom *a)
{
return (ao_lisp_poly) a + AO_LISP_OTHER;
}
static inline struct ao_lisp_builtin *
ao_lisp_poly_builtin(ao_lisp_poly poly)
{
return (struct ao_lisp_builtin *) (poly - AO_LISP_OTHER);
}
static inline ao_lisp_poly
ao_lisp_builtin_poly(struct ao_lisp_builtin *b)
{
return (ao_lisp_poly) b + AO_LISP_OTHER;
}
/* memory functions */
void
ao_lisp_mark(const struct ao_lisp_mem_type *type, void *addr);
/* returns 1 if the object was already marked */
int
ao_lisp_mark_memory(void *addr, int size);
void *
ao_lisp_move(const struct ao_lisp_mem_type *type, void *addr);
/* returns NULL if the object was already moved */
void *
ao_lisp_move_memory(void *addr, int size);
void *
ao_lisp_alloc(int size);
int
ao_lisp_root_add(const struct ao_lisp_mem_type *type, void *addr);
void
ao_lisp_root_clear(void *addr);
/* cons */
extern const struct ao_lisp_mem_type ao_lisp_cons_type;
struct ao_lisp_cons *
ao_lisp_cons(ao_lisp_poly car, struct ao_lisp_cons *cdr);
void
ao_lisp_cons_print(struct ao_lisp_cons *cons);
/* string */
extern const struct ao_lisp_mem_type ao_lisp_string_type;
char *
ao_lisp_string_new(int len);
char *
ao_lisp_string_copy(char *a);
char *
ao_lisp_string_cat(char *a, char *b);
void
ao_lisp_string_print(char *s);
/* atom */
extern const struct ao_lisp_mem_type ao_lisp_atom_type;
void
ao_lisp_atom_init(void);
void
ao_lisp_atom_print(struct ao_lisp_atom *atom);
struct ao_lisp_atom *
ao_lisp_atom_intern(char *name);
/* int */
void
ao_lisp_int_print(int i);
/* prim */
ao_lisp_poly
ao_lisp_poly_print(ao_lisp_poly p);
void
ao_lisp_poly_mark(ao_lisp_poly p);
ao_lisp_poly
ao_lisp_poly_move(ao_lisp_poly p);
/* eval */
ao_lisp_poly
ao_lisp_eval(ao_lisp_poly p);
/* builtin */
void
ao_lisp_builtin_print(struct ao_lisp_builtin *b);
/* read */
ao_lisp_poly
ao_lisp_read(void);
#endif /* _AO_LISP_H_ */
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