/*
 * nanowasm, a tiny WebAssembly/Wasm interpreter
 * Copyright (C) 2023-2024  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 <nanowasm/types.h>
#include <nw/interp.h>
#include <nw/log.h>
#include <nw/routines.h>

static enum nw_state push(struct nw_interp *const i)
{
    const struct nw_i_sm_exp *const e = &i->sm.export;

    if (e->kind != NW_KIND_FUNCTION)
    {
        static const char exc[] = "unexpected import kind";

        i->exception = exc;
        LOG("%s: %s: %d\n", __func__, exc, e->kind);
        return NW_FATAL;
    }

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

int nw_start(const struct nw_inst_cfg *const icfg, struct nw_inst *const i)
{
    *i = (const struct nw_inst){0};

    if (nwp_interp_start(&icfg->interp_cfg, NULL, &i->interp))
    {
        LOG("%s: nwp_interp_start failed\n", __func__);
        return -1;
    }

    nwp_find_export(&i->interp, "_start", push);
    return 0;
}