src/routines/section/function.c


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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/io.h>
#include <nw/log.h>
#include <nw/routines.h>

static enum nw_state get_entry(struct nw_mod *const m)
{
    struct nw_sm_fn *const fn = &m->sm.function;
    const struct nw_io_cfg *const cfg = &m->cfg.io;
    struct nw_sm_leb128 *const l = &fn->leb128;
    nw_varuint32 type;
    const enum nw_state n = nwp_varuint32(cfg, l, &type, cfg->user);

    if (n)
        return n;
    else if (++fn->entry_i >= m->function_count)
        m->next = 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_fn *const fn = &m->sm.function;
    struct nw_sm_leb128 *const l = &fn->leb128;
    const enum nw_state n = nwp_varuint32(cfg, l, &m->function_count,
        cfg->user);

    if (n)
        return n;

    m->next = get_entry;
    return NW_AGAIN;
}

void nwp_section_function(struct nw_mod *const m)
{
    const struct nw_sm_fn fn = {0};

    m->next = get_count;
    m->sm.function = fn;
}