src/routines/mem_imm.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/routines.h>
#include <nw/io.h>

static enum nw_state get_offset(struct nw_interp *const i)
{
    struct nw_i_sm_imm *const imm = &i->sm.imm;
    struct nw_sm_leb128 *const l = &imm->leb128;
    const struct nw_io_cfg *const cfg = &i->cfg.io;
    const enum nw_state n = nwp_varuint32(cfg, l, &imm->out.offset, cfg->user);

    if (n)
        return n;

    imm->next(i);
    return NW_AGAIN;
}

static enum nw_state get_flags(struct nw_interp *const i)
{
    struct nw_i_sm_imm *const imm = &i->sm.imm;
    struct nw_sm_leb128 *const l = &imm->leb128;
    const struct nw_io_cfg *const cfg = &i->cfg.io;
    const enum nw_state n = nwp_varuint32(cfg, l, &imm->out.flags, cfg->user);

    if (n)
        return n;

    i->next = get_offset;
    return NW_AGAIN;
}

void nwp_mem_imm(struct nw_interp *const i,
    void (*const next)(struct nw_interp *))
{
    const struct nw_i_sm_imm imm = {0};
    struct nw_i_sm_imm *const p = &i->sm.imm;

    *p = imm;
    p->next = next;
    i->next = get_flags;
}