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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 <nw/types.h>
#include <limits.h>
#include <string.h>
static enum nw_state get_content_type(struct nw_mod *);
static int push(const void *const src, const size_t n, void *const user)
{
struct nw_mod *const m = user;
struct nw_sm_gl *const gl = &m->sm.global;
if (n > sizeof gl->value)
{
#ifdef NW_LOG
nwp_log("stack overflow\n");
#endif
return -1;
}
memcpy(&gl->value, src, n);
return n;
}
static enum nw_state loop(struct nw_mod *const m)
{
struct nw_sm_gl *const gl = &m->sm.global;
const enum nw_state n = nwp_interp_run(&gl->interp);
if (n)
return n;
m->next = ++gl->entry_i >= m->global_count ?
nwp_section_exit : get_content_type;
return NW_AGAIN;
}
static enum nw_state get_global(struct nw_mod *const m)
{
struct nw_sm_gl *const gl = &m->sm.global;
struct nw_interp_cfg cfg = {0};
cfg.m = m;
cfg.io = m->cfg.io;
cfg.user = m;
cfg.stack.push = push;
if (nwp_interp_start(&gl->interp, &cfg, &nwp_interp_initexpr_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_mutability(struct nw_mod *const m)
{
nw_varuint1 mutability;
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_gl *const gl = &m->sm.global;
struct nw_sm_leb128 *const l = &gl->leb128;
const enum nw_state n = nwp_varuint1(cfg, l, &mutability, cfg->user);
if (n)
return n;
m->next = get_global;
return NW_AGAIN;
}
static enum nw_state get_content_type(struct nw_mod *const m)
{
nw_varint7 content_type;
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_gl *const gl = &m->sm.global;
struct nw_sm_leb128 *const l = &gl->leb128;
const enum nw_state n = nwp_varint7(cfg, l, &content_type, cfg->user);
enum nw_type type;
/* TODO: do not ignore type */
if (n)
return n;
else if (nwp_get_type(content_type, &type))
{
#ifdef NW_LOG
nwp_log("nwp_get_type failed\n");
#endif
return NW_FATAL;
}
m->next = get_mutability;
return NW_AGAIN;
}
static enum nw_state get_count(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_gl *const gl = &m->sm.global;
struct nw_sm_leb128 *const l = &gl->leb128;
enum nw_state n;
if (!m->sections[NW_SECTION_IMPORT])
{
#ifdef NW_LOG
nwp_log("global section found before import section\n");
#endif
return NW_FATAL;
}
else if ((n = nwp_varuint32(cfg, l, &m->global_count, cfg->user)))
return n;
else if (m->global_count > ULONG_MAX / sizeof (struct nw_global))
{
#ifdef NW_LOG
nwp_log("global_count too large: %lu\n",
(unsigned long)m->global_count);
#endif
return NW_FATAL;
}
m->out.global = m->global_count * sizeof (struct nw_global);
m->next = m->global_count ? get_content_type : nwp_section_exit;
return NW_AGAIN;
}
void nwp_section_global(struct nw_mod *const m)
{
const struct nw_sm_gl g = {0};
m->sm.global = g;
m->next = get_count;
}
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