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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 enum nw_state get_target(struct nw_interp *const i)
{
nw_varuint32 target;
struct nw_i_sm_br_table *const b = &i->sm.br_table;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_varuint32(cfg, &b->leb128, &target, cfg->user);
if (n)
return n;
else if (b->target_i == b->offset
|| (!b->set && b->target_i >= b->target_count))
{
b->set = 1;
b->relative_depth = target;
}
if (b->target_i >= b->target_count)
nwp_break(i, b->relative_depth, b->offset);
else
b->target_i++;
return NW_AGAIN;
}
static enum nw_state pop(struct nw_interp *const i)
{
struct nw_i_sm_br_table *const b = &i->sm.br_table;
const enum nw_state n = nwp_stack_pop(i, &b->io);
if (n)
return n;
i->next = get_target;
return NW_AGAIN;
}
static enum nw_state get_target_count(struct nw_interp *const i)
{
struct nw_i_sm_br_table *const b = &i->sm.br_table;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_varuint32(cfg, &b->leb128,
&b->target_count, cfg->user);
const enum nw_type pt = i->push_type;
if (n)
return n;
else if (pt != NW_TYPE_I32)
{
static const char *const exc = "expected i32 expression for br_table";
const char *const stype = nwp_type_str(pt);
i->exception = exc;
#ifdef NW_LOG
if (stype)
nwp_log("%s, got: %s\n", exc, stype);
else
nwp_log("%s, got: unknown (%#x)\n", exc, (unsigned)pt);
#endif
return NW_FATAL;
}
else
{
struct nw_sm_io io = {0};
io.buf = &b->offset;
io.n = sizeof b->offset;
b->io = io;
i->next = pop;
}
return NW_AGAIN;
}
void nwp_op_br_table(struct nw_interp *const i)
{
static const struct nw_i_sm_br_table b;
i->next = get_target_count;
i->sm.br_table = b;
}
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