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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/interp.h>
#include <nw/io.h>
#include <nw/log.h>
#include <nw/routines.h>
#include <string.h>
static enum nw_state get_index(struct nw_mod *);
static enum nw_state skip_bytes(struct nw_mod *const m)
{
struct nw_sm_d *const d = &m->sm.data;
const struct nw_io_cfg *const cfg = &m->cfg.io;
const long offset = d->offset + d->size;
const enum nw_state n = cfg->seek(offset, cfg->user);
if (n)
return n;
m->next = ++d->entry_i >= m->data_count ? nwp_section_exit : get_index;
return NW_AGAIN;
}
static enum nw_state tell(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_d *const d = &m->sm.data;
const enum nw_state n = cfg->tell(&d->offset, cfg->user);
if (n)
return n;
m->next = skip_bytes;
return NW_AGAIN;
}
static enum nw_state get_size(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_d *const d = &m->sm.data;
struct nw_sm_leb128 *const l = &d->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &d->size, cfg->user);
if (n)
return n;
else if (!d->size)
{
#ifdef NW_LOG
nwp_log("unexpected zero size for data entry %lu\n",
(unsigned long)d->entry_i);
#endif
return NW_FATAL;
}
m->next = tell;
return NW_AGAIN;
}
static int push(const void *const src, const size_t n, void *const user)
{
struct nw_mod *const m = user;
struct nw_sm_d *const d = &m->sm.data;
if (n > sizeof d->value)
{
#ifdef NW_LOG
nwp_log("stack overflow\n");
#endif
return -1;
}
memcpy(&d->value, src, n);
return n;
}
static enum nw_state loop(struct nw_mod *const m)
{
struct nw_sm_d *const d = &m->sm.data;
const enum nw_state n = nwp_interp_run(&d->interp);
if (n)
return n;
m->next = get_size;
return NW_AGAIN;
}
static enum nw_state setup_initexpr(struct nw_mod *const m)
{
struct nw_interp_cfg icfg = {0};
struct nw_sm_d *const d = &m->sm.data;
icfg.m = m;
icfg.io = m->cfg.io;
icfg.user = m;
icfg.stack.push = push;
if (nwp_interp_start(&d->interp, &icfg, &nwp_interp_data_set))
{
#ifdef NW_LOG
nwp_log("nw_interp_start failed\n");
#endif
return NW_FATAL;
}
m->next = loop;
return NW_AGAIN;
}
static enum nw_state get_index(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_d *const d = &m->sm.data;
struct nw_sm_leb128 *const l = &d->leb128;
nw_varuint32 *const index = &d->index;
const enum nw_state n = nwp_varuint32(cfg, l, index, cfg->user);
if (n)
return n;
else if (*index)
{
#ifdef NW_LOG
nwp_log("expected memory index 0 in data entry %lu, got %lu\n",
(unsigned long)d->entry_i, *index);
#endif
return NW_FATAL;
}
return setup_initexpr(m);
}
static enum nw_state get_count(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
const long dc = m->sections[NW_SECTION_DATA_COUNT];
struct nw_sm_d *const d = &m->sm.data;
struct nw_sm_leb128 *const l = &d->leb128;
nw_varuint32 count, *const pcount = dc ? &count : &m->data_count;
enum nw_state n;
if (!m->sections[NW_SECTION_MEMORY])
{
#ifdef NW_LOG
nwp_log("data section found before memory section\n");
#endif
return NW_FATAL;
}
else if ((n = nwp_varuint32(cfg, l, pcount, cfg->user)))
return n;
else if (dc && count != m->data_count)
{
#ifdef NW_LOG
nwp_log("data count mismatch, expected %lu, got %lu\n",
(unsigned long)m->data_count, (unsigned long)count);
#endif
return NW_FATAL;
}
m->next = m->data_count ? get_index : nwp_section_exit;
return NW_AGAIN;
}
void nwp_section_data(struct nw_mod *const m)
{
const struct nw_sm_d d = {0};
m->sm.data = d;
m->next = get_count;
}
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