src/op/i32_const.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/interp.h>
#include <nw/log.h>
#include <nw/ops.h>
#include <nw/stack.h>

static enum nw_state push(struct nw_interp *const i)
{
    struct nw_i_sm_i32_const *const c = &i->sm.i32_const;
    const enum nw_state n = nwp_stack_push(i, &c->io);

    if (n)
        return n;

    i->push_type = NW_TYPE_I32;
    nwp_interp_resume(i);
    return NW_AGAIN;
}

static enum nw_state get_value(struct nw_interp *const i)
{
    const struct nw_io_cfg *const cfg = &i->cfg.io;
    struct nw_i_sm_i32_const *const c = &i->sm.i32_const;
    struct nw_sm_leb128 *const l = &c->leb128;
    const enum nw_state n = nwp_varint32(cfg, l, &c->value, cfg->user);

    if (n)
        return n;
    else
    {
        struct nw_sm_io io = {0};

        io.buf = &c->value;
        io.n = sizeof c->value;
        c->io = io;
        i->next = push;
    }

    return NW_AGAIN;
}

void nwp_op_i32_const(struct nw_interp *const i)
{
    static const struct nw_i_sm_i32_const c;

    i->next = get_value;
    i->sm.i32_const = c;
}