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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/interp.h>
#include <nw/log.h>
#include <nw/routines.h>
#include <nw/stack.h>
#include <nw/types.h>
static enum nw_state push(struct nw_interp *const i)
{
struct nw_i_sm_arithm *const s = &i->sm.arithm;
const enum nw_state n = nwp_stack_push(i, &s->io);
if (n)
return n;
i->push_type = s->type;
nwp_interp_resume(i);
return NW_AGAIN;
}
static int init_io(struct nw_interp *const i)
{
struct nw_i_sm_arithm *const s = &i->sm.arithm;
size_t sz;
if (nwp_type_sz(s->type, &sz))
{
static const char *const exc = "invalid operand type";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %#x\n", exc, (unsigned)s->type);
#endif
return -1;
}
else
{
struct nw_sm_io io = {0};
io.buf = &s->value;
io.n = sz;
s->io = io;
}
return 0;
}
static enum nw_state pop_left(struct nw_interp *const i)
{
struct nw_i_sm_arithm *const s = &i->sm.arithm;
const enum nw_state n = nwp_stack_pop(i, &s->io);
if (n)
return n;
s->out.left = s->value;
if (s->op(&s->out, &s->value))
{
static const char *const exc = "arithmetic operation failed";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s\n", exc);
#endif
return NW_FATAL;
}
else if (init_io(i))
return NW_FATAL;
i->next = push;
return NW_AGAIN;
}
static enum nw_state pop_right(struct nw_interp *const i)
{
struct nw_i_sm_arithm *const s = &i->sm.arithm;
const enum nw_state n = nwp_stack_pop(i, &s->io);
if (n)
return n;
else if (init_io(i))
return NW_FATAL;
s->out.right = s->value;
i->next = pop_left;
return NW_AGAIN;
}
static enum nw_state prepare_right(struct nw_interp *const i)
{
if (init_io(i))
return NW_FATAL;
i->next = pop_right;
return NW_AGAIN;
}
void nwp_arithm(struct nw_interp *const i, const enum nw_type t,
int (*const op)(const struct nw_i_sm_arithm_out *, union nw_value *))
{
const struct nw_i_sm_arithm s = {0};
struct nw_i_sm_arithm *const ps = &i->sm.arithm;
*ps = s;
ps->type = t;
ps->op = op;
i->next = prepare_right;
}
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