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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/io.h>
#include <nw/interp.h>
#include <nw/log.h>
#include <nw/routines.h>
#include <nw/stack.h>
#include <nw/types.h>
static enum nw_state get_entry_count(struct nw_interp *);
static enum nw_state push_frame(struct nw_interp *const i)
{
struct nw_i_sm_pl *const pl = &i->sm.pl;
const enum nw_state n = nwp_stack_push(i, &pl->io);
if (n)
return n;
i->fr = pl->fr;
#ifdef NW_LOG
nwp_log("entering function %lu\n", (unsigned long)i->fr.fn.index);
#endif
nwp_interp_resume(i);
return NW_AGAIN;
}
static void init(struct nw_i_sm_pl *const pl)
{
union nw_value *const v = &pl->value;
struct nw_sm_io io = {0};
io.buf = v;
switch (pl->meta.type)
{
case NW_TYPE_I32:
v->i32 = 0;
io.n = sizeof v->i32;
break;
case NW_TYPE_I64:
v->i64.low = 0;
v->i64.hi = 0;
io.n = sizeof v->i64;
break;
case NW_TYPE_F32:
v->f32 = 0;
io.n = sizeof v->f32;
break;
case NW_TYPE_F64:
v->f64 = 0;
io.n = sizeof v->f64;
break;
}
pl->io = io;
}
static enum nw_state get_code_start(struct nw_interp *const i)
{
struct nw_i_sm_pl *const pl = &i->sm.pl;
struct nw_frame *const fr = &pl->fr;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = cfg->tell(&fr->start, cfg->user);
if (n)
return n;
else
{
struct nw_sm_io io = {0};
io.buf = &i->fr;
io.n = sizeof i->fr;
pl->io = io;
fr->local_end = nwp_stack_ptr(i);
fr->body_size -= fr->start - pl->body_start;
i->next = push_frame;
}
return NW_AGAIN;
}
static enum nw_state push_local(struct nw_interp *const i)
{
struct nw_i_sm_pl *const pl = &i->sm.pl;
const enum nw_state n = nwp_stack_push(i, &pl->io);
if (n)
return n;
else if (++pl->entry_i >= pl->meta.entry_count)
i->next = ++pl->local_i >= pl->local_count ?
get_code_start : get_entry_count;
else
init(pl);
return NW_AGAIN;
}
static enum nw_state push_meta(struct nw_interp *const i)
{
struct nw_i_sm_pl *const pl = &i->sm.pl;
const enum nw_state n = nwp_stack_push(i, &pl->io);
if (n)
return n;
init(pl);
i->next = push_local;
return NW_AGAIN;
}
static enum nw_state get_type(struct nw_interp *const i)
{
nw_varint7 type;
struct nw_i_sm_pl *const pl = &i->sm.pl;
struct nw_sm_leb128 *const l = &pl->leb128;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_varint7(cfg, l, &type, cfg->user);
if (n)
return n;
else if (nwp_get_type(type, &pl->meta.type))
{
static const char *const exc = "invalid type";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %x\n", exc, (unsigned)type);
#endif
return NW_FATAL;
}
else
{
struct nw_sm_io io = {0};
io.buf = &pl->meta;
io.n = sizeof pl->meta;
pl->io = io;
i->next = push_meta;
}
return NW_AGAIN;
}
static enum nw_state get_entry_count(struct nw_interp *const i)
{
struct nw_i_sm_pl *const pl = &i->sm.pl;
struct nw_sm_leb128 *const l = &pl->leb128;
nw_varuint32 *const count = &pl->meta.entry_count;
struct nw_frame *const fr = &pl->fr;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_varuint32(cfg, l, count, cfg->user);
if (n)
return n;
pl->entry_i = 0;
fr->local_count += *count;
i->next = get_type;
return NW_AGAIN;
}
static enum nw_state get_count(struct nw_interp *const i)
{
struct nw_i_sm_pl *const pl = &i->sm.pl;
struct nw_sm_leb128 *const l = &pl->leb128;
struct nw_frame *const fr = &pl->fr;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_varuint32(cfg, l, &pl->local_count, cfg->user);
if (n)
return n;
fr->local_start = nwp_stack_ptr(i);
i->next = pl->local_count ? get_entry_count : get_code_start;
return NW_AGAIN;
}
static enum nw_state get_body_start(struct nw_interp *const i)
{
struct nw_i_sm_pl *const pl = &i->sm.pl;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = cfg->tell(&pl->body_start, cfg->user);
if (n)
return n;
i->next = get_count;
return NW_AGAIN;
}
static enum nw_state get_body_len(struct nw_interp *const i)
{
struct nw_i_sm_pl *const pl = &i->sm.pl;
struct nw_sm_leb128 *const l = &pl->leb128;
struct nw_frame *const fr = &pl->fr;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_varuint32(cfg, l, &fr->body_size, cfg->user);
if (n)
return n;
i->next = get_body_start;
return NW_AGAIN;
}
static void begin(struct nw_interp *const i)
{
const struct nw_i_sm_pl l = {0};
const struct nw_fn fn = i->sm.ffn.fn;
struct nw_i_sm_pl *const pl = &i->sm.pl;
struct nw_frame *const fr = &pl->fr;
*pl = l;
fr->child = 1;
fr->fn = fn;
fr->fr_start = nwp_stack_ptr(i);
i->next = get_body_len;
}
static enum nw_state find(struct nw_interp *const i)
{
nwp_find_function(i, &i->sm.type.out, begin);
return NW_AGAIN;
}
void nwp_call_function(struct nw_interp *const i, const nw_varuint32 index)
{
nwp_get_function_type(i, index, find);
}
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