src/op/if.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/interp.h>
#include <nw/io.h>
#include <nw/ops.h>
#include <nw/routines.h>
#include <nw/stack.h>
#include <nw/types.h>

static enum nw_state pop(struct nw_interp *const i)
{
    struct nw_i_sm_if *const pif = &i->sm.sm_if;
    const enum nw_state n = nwp_stack_pop(i, &pif->io);

    if (n)
        return n;
    else if (pif->condition)
        nwp_interp_resume(i);
    else
        nwp_break(i, 0, 0);

    return NW_AGAIN;
}

void nwp_op_if(struct nw_interp *const i)
{
    static const struct nw_i_sm_if sm_if;
    struct nw_i_sm_if *const pif = &i->sm.sm_if;
    struct nw_sm_io *const io = &pif->io;

    *pif = sm_if;
    io->buf = &pif->condition;
    io->n = sizeof pif->condition;
    nwp_start_block(i, &pif->sb, pop);
}