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/*
* nanowasm, a tiny WebAssembly/Wasm interpreter
* Copyright (C) 2023-2025 Xavier Del Campo Romero
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
#include <nanowasm/nw.h>
#include <nw/interp.h>
#include <nw/io.h>
#include <nw/log.h>
#include <nw/routines.h>
static enum nw_state entry_loop(struct nw_mod *m);
static enum nw_state get_index(struct nw_mod *const m)
{
nw_varuint32 index;
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_exp *const e = &m->sm.export;
struct nw_sm_leb128 *const l = &e->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &index, cfg->user);
if (n)
return n;
e->entry_i++;
m->next = entry_loop;
return NW_AGAIN;
}
static enum nw_state get_kind(struct nw_mod *const m)
{
unsigned char kind;
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_io io = {0};
enum nw_state n;
io.buf = &kind;
io.n = sizeof kind;
if ((n = nwp_io_read(cfg, &io, cfg->user)))
return n;
/* TODO: check kind */
m->next = get_index;
return NW_AGAIN;
}
static enum nw_state get_name(struct nw_mod *const m)
{
unsigned char b;
struct nw_sm_exp *const e = &m->sm.export;
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_io io = {0};
enum nw_state n;
io.buf = &b;
io.n = sizeof b;
if ((n = nwp_io_read(cfg, &io, cfg->user)))
return n;
else if (++e->len_i >= e->field_len)
{
e->len_i = 0;
m->next = get_kind;
}
return NW_AGAIN;
}
static enum nw_state get_len(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_exp *const e = &m->sm.export;
struct nw_sm_leb128 *const l = &e->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &e->field_len, cfg->user);
if (n)
return n;
else if (!e->field_len)
{
#ifdef NW_LOG
nwp_log("invalid field length\n");
#endif
return NW_FATAL;
}
m->next = get_name;
return NW_AGAIN;
}
static enum nw_state entry_loop(struct nw_mod *const m)
{
const struct nw_sm_exp *const e = &m->sm.export;
m->next = e->entry_i < e->count ? get_len : nwp_section_exit;
return NW_AGAIN;
}
static enum nw_state get_count(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_exp *const e = &m->sm.export;
struct nw_sm_leb128 *const l = &e->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &e->count, cfg->user);
if (n)
return n;
m->next = entry_loop;
return NW_AGAIN;
}
void nwp_section_export(struct nw_mod *const m)
{
const struct nw_sm_exp e = {0};
m->sm.export = e;
m->next = get_count;
}
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