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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 <nw/interp.h>
#include <nw/io.h>
#include <nw/log.h>
#include <nw/opcodes.h>
#include <nw/ops.h>
#include <nw/stack.h>
#include <nw/types.h>
static enum nw_state push(struct nw_interp *const i)
{
struct nw_i_sm_select *const s = &i->sm.select;
const enum nw_state n = nwp_stack_push(i, &s->io);
if (n)
return n;
nwp_interp_resume(i);
return NW_AGAIN;
}
static enum nw_state pop_left(struct nw_interp *const i)
{
struct nw_i_sm_select *const s = &i->sm.select;
const enum nw_state n = nwp_stack_pop(i, &s->io);
struct nw_sm_io io = {0};
if (n)
return n;
io.buf = s->condition ? &s->left : &s->right;
io.n = s->sz;
s->io = io;
i->next = push;
return NW_AGAIN;
}
static enum nw_state pop_right(struct nw_interp *const i)
{
struct nw_i_sm_select *const s = &i->sm.select;
const enum nw_state n = nwp_stack_pop(i, &s->io);
if (n)
return n;
else
{
struct nw_sm_io io = {0};
io.buf = &s->left;
io.n = s->sz;
s->io = io;
}
i->next = pop_left;
return NW_AGAIN;
}
static enum nw_state pop_condition(struct nw_interp *const i)
{
struct nw_i_sm_select *const s = &i->sm.select;
const enum nw_state n = nwp_stack_pop(i, &s->io);
if (n)
return n;
else
{
struct nw_sm_io io = {0};
io.buf = &s->right;
io.n = s->sz;
s->io = io;
}
i->next = pop_right;
return NW_AGAIN;
}
static enum nw_state check(struct nw_interp *const i)
{
struct nw_i_sm_select *const s = &i->sm.select;
if (nwp_type_sz(i->push_type, &s->sz))
{
static const char *const exc = "invalid type";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %#x\n", exc, (unsigned)i->push_type);
#endif
return NW_FATAL;
}
else
{
struct nw_sm_io io = {0};
io.buf = &s->condition;
io.n = sizeof s->condition;
s->io = io;
}
i->next = pop_condition;
return NW_AGAIN;
}
void nwp_op_select(struct nw_interp *const i)
{
const struct nw_i_sm_select s = {0};
i->sm.select = s;
i->next = check;
}
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