src/op/call_indirect.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/types.h>

static enum nw_state get_pc(struct nw_interp *const i)
{
    struct nw_i_sm_call *const c = &i->sm.call;
    const struct nw_io_cfg *const cfg = &i->cfg.io;
    const enum nw_state n = cfg->tell(&i->fr.pc, cfg->user);

    if (n)
        return n;

    nwp_call(i, c->index);
    return NW_AGAIN;
}

static enum nw_state get_value(struct nw_interp *const i)
{
    struct nw_i_sm_call_indirect *const ci = &i->sm.call_indirect;
    struct nw_sm_leb128 *const l = &ci->leb128;
    const struct nw_io_cfg *const cfg = &i->cfg.io;
    const enum nw_state n = nwp_varuint32(cfg, l, &ci->value, cfg->user);

    if (n)
        return n;

    i->next = get_pc;
    return NW_AGAIN;
}

static enum nw_state get_index(struct nw_interp *const i)
{
    struct nw_i_sm_call_indirect *const ci = &i->sm.call_indirect;
    struct nw_sm_leb128 *const l = &ci->leb128;
    const struct nw_io_cfg *const cfg = &i->cfg.io;
    const enum nw_state n = nwp_varuint32(cfg, l, &ci->index, cfg->user);

    if (n)
        return n;

    i->next = get_value;
    return NW_AGAIN;
}

void nwp_op_call_indirect(struct nw_interp *const i)
{
    static const struct nw_i_sm_call_indirect ci;

    i->sm.call_indirect = ci;
    i->next = get_index;
}