src/op/check/block.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/ops.h>
#include <nw/types.h>

static enum nw_state get_type(struct nw_mod *const m)
{
    nw_varint7 type;
    const struct nw_io_cfg *const cfg = &m->cfg.io;
    struct nw_sm_c *const c = &m->sm.code;
    struct nw_sm_leb128 *const l = &c->leb128;
    const enum nw_state n = nwp_varint7(cfg, l, &type, cfg->user);
    enum nw_type t;

    if (n)
        return n;
    else if (nwp_get_type(type, &t) && type != 0x40)
    {
#ifdef NW_LOG
        nwp_log("invalid block_type %#x\n", (unsigned)type);
#endif
        return NW_FATAL;
    }

    c->fn.blocks++;
    m->next = m->sm.code.next;
    return NW_AGAIN;
}

void nwp_op_check_block(struct nw_mod *const m)
{
    m->next = get_type;
}