/*
 * 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 <nanowasm/dbg.h>
#include <nw/log.h>
#include <nw/routines.h>
#include <nw/stack.h>
#include <nw/types.h>

static enum nw_state read_param(struct nw_interp *const i)
{
    struct nw_dbg *const d = i->args;
    struct nw_dbg_sm_param *const p = &d->sm.param;
    const struct nw_find_param_out *const out = &p->fp.out;
    const enum nw_state n = nwp_stack_read(i, &p->io, out->addr);

    if (n)
        return n;

    i->next = p->inext;
    return NW_AGAIN;
}

static enum nw_state done(struct nw_interp *const i)
{
    struct nw_dbg *const d = i->args;
    struct nw_dbg_sm_param *const p = &d->sm.param;
    const struct nw_find_param_out *const po = &p->fp.out;
    const enum nw_type t = po->type;
    size_t sz;

    if (nwp_type_sz(t, &sz))
    {
        static const char *const exc = "invalid type";

        i->exception = exc;
#ifdef NW_LOG
        nwp_log("%s: %#x\n", exc, (unsigned)t);
#endif
        return -1;
    }
    else
    {
        struct nw_sm_io io = {0};

        io.buf = &d->v.value;
        io.n = sz;
        p->io = io;
    }

    i->next = read_param;
    return NW_AGAIN;
}

void nw_dbg_param(struct nw_dbg *const d, const unsigned long index)
{
    const struct nw_dbg_sm_param p = {0};
    struct nw_dbg_sm_param *const pp = &d->sm.param;
    struct nw_interp *const i = &d->cfg.inst->interp;

    *pp = p;
    pp->inext = i->next;
    nwp_find_param(i, &pp->fp, index, done, d);
}