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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/log.h>
#include <nw/routines.h>
#include <nw/types.h>
static enum nw_state seek_pc(struct nw_interp *const i)
{
struct nw_find_param *const fp = i->state;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = cfg->seek(fp->pc, cfg->user);
if (n)
return n;
fp->out.addr = i->fr.fr_start - fp->sz;
i->next = fp->next;
return NW_AGAIN;
}
static enum nw_state get_param_type(struct nw_interp *const i)
{
nw_varint7 type;
struct nw_find_param *const fp = i->state;
struct nw_sm_leb128 *const l = &fp->leb128;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_varint7(cfg, l, &type, cfg->user);
enum nw_type param_type;
size_t sz;
if (n)
return n;
else if (nwp_get_type(type, ¶m_type)
|| nwp_type_sz(param_type, &sz))
{
static const char *const exc = "invalid param type";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %#x\n", exc, (unsigned)type);
#endif
return NW_FATAL;
}
if (fp->param_i == fp->index)
fp->out.type = param_type;
if (fp->param_i >= fp->index)
fp->sz += sz;
if (++fp->param_i >= i->fr.fn.param_count)
i->next = seek_pc;
return NW_AGAIN;
}
static enum nw_state seek_param_types(struct nw_interp *const i)
{
const struct nw_io_cfg *const cfg = &i->cfg.io;
const long offset = i->fr.fn.param_types;
const enum nw_state n = cfg->seek(offset, cfg->user);
if (n)
return n;
i->next = get_param_type;
return NW_AGAIN;
}
static enum nw_state tell(struct nw_interp *const i)
{
struct nw_find_param *const fp = i->state;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = cfg->tell(&fp->pc, cfg->user);
if (n)
return n;
i->next = seek_param_types;
return NW_AGAIN;
}
void nwp_find_param(struct nw_interp *const i, struct nw_find_param *const f,
const nw_varuint32 index, enum nw_state (*const next)(struct nw_interp *),
void *const args)
{
const struct nw_find_param fp = {0};
*f = fp;
f->index = index;
f->next = next;
i->state = f;
i->next = tell;
i->args = args;
}
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