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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>
static void (*const fn[])(struct nw_mod *) =
{
nwp_section_custom,
nwp_section_type,
nwp_section_import,
nwp_section_function,
nwp_section_table,
nwp_section_memory,
nwp_section_global,
nwp_section_export,
nwp_section_start,
nwp_section_element,
nwp_section_code,
nwp_section_data,
nwp_section_data_count
};
static enum nw_state get_offset(struct nw_mod *const m)
{
struct nw_mod_section *const s = &m->section;
const struct nw_io_cfg *const cfg = &m->cfg.io;
const enum nw_state n = cfg->tell(&s->offset, cfg->user);
long *const offset = &m->sections[s->section];
if (n)
return n;
/* Custom section can appear more than once. */
else if (s->section != NW_SECTION_CUSTOM && *offset)
{
#ifdef NW_LOG
nwp_log("ignoring duplicate section %u\n", (unsigned)s->section);
#endif
nwp_section_skip(m);
}
else
{
*offset = s->offset;
fn[s->section](m);
}
return NW_AGAIN;
}
static enum nw_state get_length(struct nw_mod *const m)
{
struct nw_mod_section *const s = &m->section;
struct nw_sm_leb128 *const l = &s->leb128;
const struct nw_io_cfg *const cfg = &m->cfg.io;
const enum nw_state n = nwp_varuint32(cfg, l, &s->len, cfg->user);
if (n)
return n;
m->next = get_offset;
return NW_AGAIN;
}
static enum nw_state get_section(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_mod_section *const s = &m->section;
struct nw_sm_leb128 *const l = &s->leb128;
const enum nw_state n = nwp_varuint7(cfg, l, &s->section, cfg->user);
if (n)
{
if (cfg->eof(cfg->user))
return NW_OK;
return n;
}
else if (s->section >= sizeof fn / sizeof *fn)
{
#ifdef NW_LOG
nwp_log("invalid section %u\n", (unsigned)s->section);
#endif
return NW_FATAL;
}
m->next = get_length;
return NW_AGAIN;
}
void nwp_section(struct nw_mod *const m)
{
const struct nw_mod_section s = {0};
m->section = s;
m->next = get_section;
}
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