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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; version 2 of the License.
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao_lisp.h"
#if 0
#define DBG(...) printf(__VA_ARGS__)
#else
#define DBG(...)
#endif
static int name_size(char *name)
{
return sizeof(struct ao_lisp_atom) + strlen(name) + 1;
}
static int atom_size(void *addr)
{
struct ao_lisp_atom *atom = addr;
if (!atom)
return 0;
return name_size(atom->name);
}
static void atom_mark(void *addr)
{
struct ao_lisp_atom *atom = addr;
DBG ("\tatom start %s\n", atom->name);
for (;;) {
atom = ao_lisp_poly_atom(atom->next);
if (!atom)
break;
DBG("\t\tatom mark %s %d\n", atom->name, (uint8_t *) atom - ao_lisp_const);
if (ao_lisp_mark_memory(atom, atom_size(atom)))
break;
}
DBG ("\tatom done\n");
}
static void atom_move(void *addr)
{
struct ao_lisp_atom *atom = addr;
DBG("\tatom move start %s %d next %s %d\n",
atom->name, ((uint8_t *) atom - ao_lisp_const),
atom->next ? ao_lisp_poly_atom(atom->next)->name : "(none)",
atom->next ? ((uint8_t *) ao_lisp_poly_atom(atom->next) - ao_lisp_const) : 0);
for (;;) {
struct ao_lisp_atom *next;
next = ao_lisp_poly_atom(atom->next);
next = ao_lisp_move_memory(next, atom_size(next));
if (!next)
break;
DBG("\t\tatom move %s %d->%d\n", next->name, ((uint8_t *) ao_lisp_poly_atom(atom->next) - ao_lisp_const), ((uint8_t *) next - ao_lisp_const));
atom->next = ao_lisp_atom_poly(next);
atom = next;
}
DBG("\tatom move end\n");
}
const struct ao_lisp_type ao_lisp_atom_type = {
.mark = atom_mark,
.size = atom_size,
.move = atom_move,
};
struct ao_lisp_atom *ao_lisp_atoms;
struct ao_lisp_atom *
ao_lisp_atom_intern(char *name)
{
struct ao_lisp_atom *atom;
for (atom = ao_lisp_atoms; atom; atom = ao_lisp_poly_atom(atom->next)) {
if (!strcmp(atom->name, name))
return atom;
}
#ifdef ao_builtin_atoms
for (atom = ao_lisp_poly_atom(ao_builtin_atoms); atom; atom = ao_lisp_poly_atom(atom->next)) {
if (!strcmp(atom->name, name))
return atom;
}
#endif
atom = ao_lisp_alloc(name_size(name));
if (atom) {
atom->type = AO_LISP_ATOM;
atom->next = ao_lisp_atom_poly(ao_lisp_atoms);
if (!ao_lisp_atoms)
ao_lisp_root_add(&ao_lisp_atom_type, &ao_lisp_atoms);
ao_lisp_atoms = atom;
strcpy(atom->name, name);
}
return atom;
}
static struct ao_lisp_frame *ao_lisp_frame_global;
struct ao_lisp_frame *ao_lisp_frame_current;
static void
ao_lisp_atom_init(void)
{
if (!ao_lisp_frame_global) {
ao_lisp_frame_global = ao_lisp_frame_new(0, 0);
ao_lisp_root_add(&ao_lisp_frame_type, &ao_lisp_frame_global);
ao_lisp_root_add(&ao_lisp_frame_type, &ao_lisp_frame_current);
}
}
static ao_poly *
ao_lisp_atom_ref(struct ao_lisp_frame *frame, ao_poly atom)
{
ao_poly *ref;
ao_lisp_atom_init();
while (frame) {
ref = ao_lisp_frame_ref(frame, atom);
if (ref)
return ref;
frame = ao_lisp_poly_frame(frame->next);
}
if (ao_lisp_frame_global) {
ref = ao_lisp_frame_ref(ao_lisp_frame_global, atom);
if (ref)
return ref;
}
return NULL;
}
ao_poly
ao_lisp_atom_get(ao_poly atom)
{
ao_poly *ref = ao_lisp_atom_ref(ao_lisp_frame_current, atom);
if (!ref && ao_lisp_frame_global)
ref = ao_lisp_frame_ref(ao_lisp_frame_global, atom);
#ifdef ao_builtin_frame
if (!ref)
ref = ao_lisp_frame_ref(ao_lisp_poly_frame(ao_builtin_frame), atom);
#endif
if (ref)
return *ref;
return AO_LISP_NIL;
}
ao_poly
ao_lisp_atom_set(ao_poly atom, ao_poly val)
{
ao_poly *ref = ao_lisp_atom_ref(ao_lisp_frame_current, atom);
if (!ref && ao_lisp_frame_global)
ref = ao_lisp_frame_ref(ao_lisp_frame_global, atom);
if (ref)
*ref = val;
else
ao_lisp_frame_global = ao_lisp_frame_add(ao_lisp_frame_global, atom, val);
return val;
}
void
ao_lisp_atom_print(ao_poly a)
{
struct ao_lisp_atom *atom = ao_lisp_poly_atom(a);
printf("%s", atom->name);
}
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