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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/ops.h>
#include <nw/routines.h>
#include <nw/stack.h>
#include <nw/types.h>
static int init_io(struct nw_interp *const i, const enum nw_type t)
{
struct nw_i_sm_get_local *const gl = &i->sm.get_local;
size_t sz;
if (nwp_type_sz(t, &sz))
{
static const char *const exc = "invalid type";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %#x\n", exc, (unsigned)t);
#endif
return -1;
}
else
{
struct nw_sm_io io = {0};
io.buf = &gl->value;
io.n = sz;
gl->io = io;
}
return 0;
}
static enum nw_state push(struct nw_interp *const i)
{
struct nw_i_sm_get_local *const gl = &i->sm.get_local;
const enum nw_state n = nwp_stack_push(i, &gl->io);
if (n)
return n;
nwp_interp_resume(i);
return NW_AGAIN;
}
static enum nw_state get_local(struct nw_interp *const i)
{
struct nw_i_sm_get_local *const gl = &i->sm.get_local;
const struct nw_local_meta *const m = &gl->f.l.meta;
const enum nw_state n = nwp_stack_read(i, &gl->io, gl->f.l.addr);
if (n)
return n;
else if (init_io(i, m->type))
return NW_FATAL;
i->next = push;
i->push_type = m->type;
return NW_AGAIN;
}
static enum nw_state prepare_local(struct nw_interp *const i)
{
const struct nw_local_meta *const m = &i->sm.get_local.f.l.meta;
if (init_io(i, m->type))
return NW_FATAL;
i->next = get_local;
return NW_AGAIN;
}
static enum nw_state get_param(struct nw_interp *const i)
{
struct nw_i_sm_get_local *const gl = &i->sm.get_local;
const struct nw_find_param_out *const o = &gl->f.p.out;
const enum nw_state n = nwp_stack_read(i, &gl->io, o->addr);
if (n)
return n;
else if (init_io(i, o->type))
return NW_FATAL;
i->next = push;
i->push_type = o->type;
return NW_AGAIN;
}
static enum nw_state prepare_param(struct nw_interp *const i)
{
struct nw_i_sm_get_local *const gl = &i->sm.get_local;
const struct nw_find_param_out *const o = &gl->f.p.out;
if (init_io(i, o->type))
return NW_FATAL;
i->next = get_param;
return NW_AGAIN;
}
static enum nw_state get_index(struct nw_interp *const i)
{
struct nw_i_sm_get_local *const gl = &i->sm.get_local;
struct nw_sm_leb128 *const l = &gl->leb128;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const struct nw_frame *const fr = &i->fr;
const struct nw_fn *const fn = &fr->fn;
const enum nw_state n = nwp_varuint32(cfg, l, &gl->index, cfg->user);
nw_varuint32 index;
if (n)
return n;
else if (gl->index < fn->param_count)
nwp_find_param(i, &gl->f.p, gl->index, prepare_param, NULL);
else if ((index = gl->index - fn->param_count) >= fr->local_count)
{
static const char *const exc = "invalid local index";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %lu\n", exc, (unsigned long)gl->index);
#endif
return NW_FATAL;
}
else
nwp_find_local(i, &gl->f.l, index, prepare_local, NULL);
return NW_AGAIN;
}
void nwp_op_get_local(struct nw_interp *const i)
{
static const struct nw_i_sm_get_local gl;
i->sm.get_local = gl;
i->next = get_index;
}
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