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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 <nanowasm/types.h>
#include <nw/interp.h>
#include <nw/io.h>
#include <nw/log.h>
#include <nw/routines.h>
#include <string.h>
static enum nw_state entry_loop(struct nw_interp *i);
static enum nw_state get_index(struct nw_interp *const i)
{
const struct nw_io_cfg *const cfg = &i->cfg.io;
struct nw_i_sm_exp *const e = &i->sm.export;
struct nw_sm_leb128 *const l = &e->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &e->index, cfg->user);
if (n)
return n;
i->next = e->next;
return NW_AGAIN;
}
static enum nw_state get_kind(struct nw_interp *const i)
{
unsigned char kind;
const struct nw_io_cfg *const cfg = &i->cfg.io;
struct nw_i_sm_exp *const e = &i->sm.export;
struct nw_sm_io io = {0};
enum nw_state n;
io.buf = &kind;
io.n = sizeof kind;
if ((n = nwp_io_read(cfg, &io, cfg->user)))
return n;
else if (kind >= NW_KINDS)
{
static const char *const exc = "invalid export kind";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %#x\n", exc, (unsigned)kind);
#endif
return NW_FATAL;
}
e->kind = kind;
i->next = get_index;
return NW_AGAIN;
}
static enum nw_state skip_index(struct nw_interp *const i)
{
const struct nw_io_cfg *const cfg = &i->cfg.io;
struct nw_i_sm_exp *const e = &i->sm.export;
struct nw_sm_leb128 *const l = &e->leb128;
nw_varuint32 index;
const enum nw_state n = nwp_varuint32(cfg, l, &index, cfg->user);
if (n)
return n;
e->entry_i++;
i->next = entry_loop;
return NW_AGAIN;
}
static enum nw_state skip_kind(struct nw_interp *const i)
{
const struct nw_io_cfg *const cfg = &i->cfg.io;
unsigned char b;
struct nw_sm_io io = {0};
enum nw_state n;
io.buf = &b;
io.n = sizeof b;
if ((n = nwp_io_read(cfg, &io, cfg->user)))
return n;
i->next = skip_index;
return NW_AGAIN;
}
static enum nw_state skip_field_str(struct nw_interp *const i)
{
const struct nw_io_cfg *const cfg = &i->cfg.io;
const struct nw_i_sm_exp *const e = &i->sm.export;
const long offset = e->offset + (e->len - e->len_i);
const enum nw_state n = cfg->seek(offset, cfg->user);
if (n)
return n;
i->next = skip_kind;
return NW_AGAIN;
}
static enum nw_state tell(struct nw_interp *const i)
{
struct nw_i_sm_exp *const e = &i->sm.export;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = cfg->tell(&e->offset, cfg->user);
if (n)
return n;
i->next = skip_field_str;
return NW_AGAIN;
}
static enum nw_state compare(struct nw_interp *const i)
{
unsigned char b;
const struct nw_io_cfg *const cfg = &i->cfg.io;
struct nw_i_sm_exp *const e = &i->sm.export;
struct nw_sm_io io = {0};
enum nw_state n;
io.buf = &b;
io.n = sizeof b;
if ((n = nwp_io_read(cfg, &io, cfg->user)))
return n;
else if (b != e->sym[e->len_i++])
i->next = tell;
else if (e->len_i >= e->len)
i->next = get_kind;
return NW_AGAIN;
}
static enum nw_state get_len(struct nw_interp *const i)
{
const struct nw_io_cfg *const cfg = &i->cfg.io;
struct nw_i_sm_exp *const e = &i->sm.export;
struct nw_sm_leb128 *const l = &e->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &e->len, cfg->user);
if (n)
return n;
else if (e->len != strlen(e->sym))
i->next = skip_field_str;
else
i->next = compare;
return NW_AGAIN;
}
static enum nw_state entry_loop(struct nw_interp *const i)
{
struct nw_i_sm_exp *const e = &i->sm.export;
if (e->entry_i >= e->count)
{
static const char *const exc = "failed to find symbol";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %s\n", exc, e->sym);
#endif
return NW_FATAL;
}
e->len_i = 0;
i->next = get_len;
return NW_AGAIN;
}
static enum nw_state get_count(struct nw_interp *const i)
{
const struct nw_io_cfg *const cfg = &i->cfg.io;
struct nw_i_sm_exp *const e = &i->sm.export;
struct nw_sm_leb128 *const l = &e->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &e->count, cfg->user);
if (n)
return n;
i->next = entry_loop;
return NW_AGAIN;
}
static enum nw_state seek(struct nw_interp *const i)
{
const struct nw_mod *const m = i->cfg.m;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const long offset = m->sections[NW_SECTION_EXPORT];
enum nw_state n;
if (!offset)
{
static const char *const exc = "section not found";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %s\n", exc, "export");
#endif
return NW_FATAL;
}
else if ((n = cfg->seek(offset, cfg->user)))
return n;
i->next = get_count;
return NW_AGAIN;
}
void nwp_find_export(struct nw_interp *const i, const char *const sym,
enum nw_state (*const next)(struct nw_interp *))
{
const struct nw_i_sm_exp e = {0};
struct nw_i_sm_exp *const pe = &i->sm.export;
*pe = e;
pe->sym = sym;
pe->next = next;
i->next = seek;
}
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