/*
 * 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 skip(struct nw_mod *const m)
{
    const struct nw_sm_custom *const c = &m->sm.custom;
    const struct nw_io_cfg *const cfg = &m->cfg.io;
    const enum nw_state n = cfg->seek(c->start, cfg->user);

    if (n)
        return n;

    nwp_section_skip(m);
    return NW_AGAIN;
}

static enum nw_state get_offset(struct nw_mod *const m)
{
    const struct nw_io_cfg *const cfg = &m->cfg.io;
    const enum nw_state n = cfg->tell(&m->c_sections[NW_CUSTOM_LO], cfg->user);

    if (n)
        return n;

    m->next = skip;
    return NW_AGAIN;
}

static enum nw_state check(struct nw_mod *const m)
{
    if (!m->sections[NW_SECTION_CODE])
    {
#ifdef NW_LOG
        nwp_log("code section must be defined first\n");
#endif
        return NW_FATAL;
    }

    m->next = get_offset;
    return NW_AGAIN;
}

void nwp_section_lo(struct nw_mod *const m)
{
    m->next = check;
}