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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.
*/
#include "ao_lisp.h"
#if 0
#define DBG(...) printf(__VA_ARGS__)
#else
#define DBG(...)
#endif
static inline int
frame_num_size(int num)
{
return sizeof (struct ao_lisp_frame) + num * sizeof (struct ao_lisp_val);
}
static int
frame_size(void *addr)
{
struct ao_lisp_frame *frame = addr;
return frame_num_size(frame->num);
}
#define OFFSET(a) ((int) ((uint8_t *) (ao_lisp_ref(a)) - ao_lisp_const))
static void
frame_mark(void *addr)
{
struct ao_lisp_frame *frame = addr;
int f;
for (;;) {
DBG("frame mark %p\n", frame);
if (!AO_LISP_IS_POOL(frame))
break;
for (f = 0; f < frame->num; f++) {
struct ao_lisp_val *v = &frame->vals[f];
ao_lisp_poly_mark(v->val);
DBG ("\tframe mark atom %s %d val %d at %d\n",
ao_lisp_poly_atom(v->atom)->name,
OFFSET(v->atom), OFFSET(v->val), f);
}
frame = ao_lisp_poly_frame(frame->next);
DBG("frame next %p\n", frame);
if (!frame)
break;
if (ao_lisp_mark_memory(frame, frame_size(frame)))
break;
}
}
static void
frame_move(void *addr)
{
struct ao_lisp_frame *frame = addr;
int f;
for (;;) {
DBG("frame move %p\n", frame);
if (!AO_LISP_IS_POOL(frame))
break;
for (f = 0; f < frame->num; f++) {
struct ao_lisp_val *v = &frame->vals[f];
ao_lisp_poly_move(&v->atom);
DBG("moved atom %s\n", ao_lisp_poly_atom(v->atom)->name);
ao_lisp_poly_move(&v->val);
}
if (ao_lisp_poly_move(&frame->next))
break;
frame = ao_lisp_poly_frame(frame->next);
}
}
const struct ao_lisp_type ao_lisp_frame_type = {
.mark = frame_mark,
.size = frame_size,
.move = frame_move
};
ao_poly *
ao_lisp_frame_ref(struct ao_lisp_frame *frame, ao_poly atom)
{
int f;
for (f = 0; f < frame->num; f++)
if (frame->vals[f].atom == atom)
return &frame->vals[f].val;
return NULL;
}
int
ao_lisp_frame_set(struct ao_lisp_frame *frame, ao_poly atom, ao_poly val)
{
while (frame) {
if (!AO_LISP_IS_CONST(frame)) {
ao_poly *ref = ao_lisp_frame_ref(frame, atom);
if (ref) {
*ref = val;
return 1;
}
}
frame = ao_lisp_poly_frame(frame->next);
}
return 0;
}
ao_poly
ao_lisp_frame_get(struct ao_lisp_frame *frame, ao_poly atom)
{
while (frame) {
ao_poly *ref = ao_lisp_frame_ref(frame, atom);
if (ref)
return *ref;
frame = ao_lisp_poly_frame(frame->next);
}
return AO_LISP_NIL;
}
struct ao_lisp_frame *
ao_lisp_frame_new(int num)
{
struct ao_lisp_frame *frame = ao_lisp_alloc(frame_num_size(num));
if (!frame)
return NULL;
frame->type = AO_LISP_FRAME;
frame->num = num;
frame->next = AO_LISP_NIL;
memset(frame->vals, '\0', num * sizeof (struct ao_lisp_val));
return frame;
}
static struct ao_lisp_frame *
ao_lisp_frame_realloc(struct ao_lisp_frame *frame, int new_num)
{
struct ao_lisp_frame *new;
int copy;
if (new_num == frame->num)
return frame;
new = ao_lisp_frame_new(new_num);
if (!new)
return NULL;
copy = new_num;
if (copy > frame->num)
copy = frame->num;
memcpy(new->vals, frame->vals, copy * sizeof (struct ao_lisp_val));
if (frame)
new->next = frame->next;
return new;
}
struct ao_lisp_frame *
ao_lisp_frame_add(struct ao_lisp_frame *frame, ao_poly atom, ao_poly val)
{
ao_poly *ref = frame ? ao_lisp_frame_ref(frame, atom) : NULL;
if (!ref) {
int f;
if (frame) {
f = frame->num;
frame = ao_lisp_frame_realloc(frame, f + 1);
} else {
f = 0;
frame = ao_lisp_frame_new(1);
}
if (!frame)
return NULL;
DBG ("add atom %s %d, val %d at %d\n", ao_lisp_poly_atom(atom)->name, OFFSET(atom), OFFSET(val), f);
frame->vals[f].atom = atom;
ref = &frame->vals[f].val;
}
*ref = val;
return frame;
}
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