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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 condition(struct nw_interp *const i)
{
const struct nw_i_sm_br_if *const b = &i->sm.br_if;
switch (i->push_type)
{
case NW_TYPE_I32:
return b->condition.i32;
case NW_TYPE_I64:
return b->condition.i64.low || b->condition.i64.hi;
case NW_TYPE_F32:
return b->condition.f32;
case NW_TYPE_F64:
return b->condition.f64;
}
return 0;
}
static enum nw_state pop(struct nw_interp *const i)
{
struct nw_i_sm_br_if *const b = &i->sm.br_if;
const enum nw_state n = nwp_stack_pop(i, &b->io);
if (n)
return n;
else if (condition(i))
nwp_break(i, b->relative_depth);
else
nwp_interp_resume(i);
return NW_AGAIN;
}
static enum nw_state get_relative_depth(struct nw_interp *const i)
{
struct nw_i_sm_br_if *const b = &i->sm.br_if;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_varuint32(cfg, &b->leb128,
&b->relative_depth, cfg->user);
size_t sz;
if (n)
return n;
else if (nwp_type_sz(i->push_type, &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 = &b->condition;
io.n = sz;
b->io = io;
i->next = pop;
}
return NW_AGAIN;
}
void nwp_op_br_if(struct nw_interp *const i)
{
static const struct nw_i_sm_br_if b = {0};
i->next = get_relative_depth;
i->sm.br_if = b;
}
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