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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 <string.h>
static enum nw_state entry_loop(struct nw_mod *);
static enum nw_state find_import(struct nw_mod *);
static enum nw_state get_function_type(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_imp *const imp = &m->sm.import;
struct nw_sm_leb128 *const l = &imp->leb128;
struct nw_import_index *const ii = &m->cfg.imp_indexes[imp->imp_i];
nw_varuint32 type;
const enum nw_state n = nwp_varuint32(cfg, l, &type, cfg->user);
if (n)
return n;
else if (imp->entry_i >= m->cfg.n_imports)
{
#ifdef NW_LOG
nwp_log("too many import entries\n");
#endif
return NW_FATAL;
}
ii->index = imp->entry_i++;
m->next = entry_loop;
return NW_AGAIN;
}
static enum nw_state skip_import(struct nw_mod *const m)
{
struct nw_sm_imp *const imp = &m->sm.import;
const struct nw_io_cfg *const cfg = &m->cfg.io;
const enum nw_state n = cfg->seek(imp->mod_off, cfg->user);
if (n)
return n;
imp->len_i = 0;
imp->imp_i++;
m->next = find_import;
return NW_AGAIN;
}
static enum nw_state get_kind(struct nw_mod *const m)
{
unsigned char kind;
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_imp *const imp = &m->sm.import;
const struct nw_import *const i = &m->cfg.imports[imp->imp_i];
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 != i->kind)
m->next = skip_import;
/* TODO: process every import type. */
else if (kind != NW_KIND_FUNCTION)
m->next = nwp_section_exit;
else
m->next = get_function_type;
return NW_AGAIN;
}
static enum nw_state compare_field(struct nw_mod *const m)
{
unsigned char byte;
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_imp *const imp = &m->sm.import;
const struct nw_import *const i = &m->cfg.imports[imp->imp_i];
struct nw_sm_io io = {0};
enum nw_state n;
io.buf = &byte;
io.n = sizeof byte;
if ((n = nwp_io_read(cfg, &io, cfg->user)))
return n;
else if (byte != i->field[imp->len_i])
m->next = skip_import;
else if (++imp->len_i >= imp->field_len)
{
m->next = get_kind;
imp->len_i = 0;
}
return NW_AGAIN;
}
static enum nw_state get_field_offset(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_imp *const imp = &m->sm.import;
const enum nw_state n = cfg->tell(&imp->field_off, cfg->user);
const struct nw_import *const i = &m->cfg.imports[imp->imp_i];
if (n)
return n;
m->next = imp->field_len != strlen(i->field) ? skip_import : compare_field;
return NW_AGAIN;
}
static enum nw_state get_field_len(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_imp *const imp = &m->sm.import;
struct nw_sm_leb128 *const l = &imp->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &imp->field_len, cfg->user);
if (n)
return n;
m->next = get_field_offset;
return NW_AGAIN;
}
static enum nw_state compare_name(struct nw_mod *const m)
{
unsigned char byte;
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_imp *const imp = &m->sm.import;
const struct nw_import *const i = &m->cfg.imports[imp->imp_i];
struct nw_sm_io io = {0};
enum nw_state n;
io.buf = &byte;
io.n = sizeof byte;
if ((n = nwp_io_read(cfg, &io, cfg->user)))
return n;
else if (byte != i->module[imp->len_i])
m->next = skip_import;
else if (++imp->len_i >= imp->mod_len)
{
m->next = get_field_len;
imp->len_i = 0;
}
return NW_AGAIN;
}
static enum nw_state dump_import_field_name(struct nw_mod *const m)
{
unsigned char byte;
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_io io = {0};
struct nw_sm_imp *const imp = &m->sm.import;
enum nw_state n;
io.buf = &byte;
io.n = sizeof byte;
if ((n = nwp_io_read(cfg, &io, cfg->user)))
return n;
#ifdef NW_LOG
nwp_log("%c", (char)byte);
#endif
if (++imp->len_i >= imp->field_len)
{
#ifdef NW_LOG
nwp_log("\n");
#endif
return NW_FATAL;
}
return NW_AGAIN;
}
static enum nw_state rewind_to_field_name(struct nw_mod *const m)
{
struct nw_sm_imp *const imp = &m->sm.import;
const struct nw_io_cfg *const cfg = &m->cfg.io;
const enum nw_state n = cfg->seek(imp->field_off, cfg->user);
if (n)
return n;
m->next = dump_import_field_name;
return NW_AGAIN;
}
static enum nw_state dump_import_mod_name(struct nw_mod *const m)
{
unsigned char byte;
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_imp *const imp = &m->sm.import;
struct nw_sm_io io = {0};
enum nw_state n;
io.buf = &byte;
io.n = sizeof byte;
if ((n = nwp_io_read(cfg, &io, cfg->user)))
return n;
#ifdef NW_LOG
nwp_log("%c", (char)byte);
#endif
if (++imp->len_i >= imp->mod_len)
{
imp->len_i = 0;
if (imp->field_off)
{
#ifdef NW_LOG
nwp_log("::");
#endif
m->next = rewind_to_field_name;
}
else
{
#ifdef NW_LOG
nwp_log("\n");
#endif
return NW_FATAL;
}
}
return NW_AGAIN;
}
static enum nw_state rewind_to_mod_name(struct nw_mod *const m)
{
struct nw_sm_imp *const imp = &m->sm.import;
const struct nw_io_cfg *const cfg = &m->cfg.io;
const enum nw_state n = cfg->seek(imp->mod_off, cfg->user);
if (n)
return n;
m->next = dump_import_mod_name;
return NW_AGAIN;
}
static enum nw_state find_import(struct nw_mod *const m)
{
struct nw_sm_imp *const imp = &m->sm.import;
const struct nw_import *i;
if (imp->imp_i >= m->cfg.n_imports)
{
#ifdef NW_LOG
nwp_log("required import: ");
#endif
m->next = rewind_to_mod_name;
return NW_AGAIN;
}
i = &m->cfg.imports[imp->imp_i];
if (imp->mod_len == strlen(i->module))
m->next = compare_name;
else
imp->imp_i++;
return NW_AGAIN;
}
static enum nw_state get_module_offset(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_imp *const imp = &m->sm.import;
const enum nw_state n = cfg->tell(&imp->mod_off, cfg->user);
if (n)
return n;
m->next = find_import;
return NW_AGAIN;
}
static enum nw_state get_module_len(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_imp *const imp = &m->sm.import;
struct nw_sm_leb128 *const l = &imp->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &imp->mod_len, cfg->user);
if (n)
return n;
m->next = get_module_offset;
return NW_AGAIN;
}
static enum nw_state entry_loop(struct nw_mod *const m)
{
struct nw_sm_imp *const imp = &m->sm.import;
imp->len_i = 0;
imp->imp_i = 0;
m->next = imp->entry_i < m->import_count ?
get_module_len : nwp_section_exit;
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_imp *const imp = &m->sm.import;
struct nw_sm_leb128 *const l = &imp->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &m->import_count, cfg->user);
if (n)
return n;
m->next = entry_loop;
return NW_AGAIN;
}
void nwp_section_import(struct nw_mod *const m)
{
const struct nw_sm_imp imp = {0};
m->next = get_count;
m->sm.import = imp;
}
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