src/op/br.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

/*
 * 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/ops.h>
#include <nw/routines.h>

static enum nw_state get_relative_depth(struct nw_interp *const i)
{
    struct nw_i_sm_br *const b = &i->sm.br;
    const struct nw_io_cfg *const cfg = &i->cfg.io;
    const enum nw_state n = nwp_varuint32(cfg, &b->leb128,
        &b->relative_depth, cfg->user);

    if (n)
        return n;

    nwp_break(i, b->relative_depth);
    return NW_AGAIN;
}

void nwp_op_br(struct nw_interp *const i)
{
    static const struct nw_i_sm_br b = {0};

    i->next = get_relative_depth;
    i->sm.br = b;
}