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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/routines.h>
static enum nw_state tell(struct nw_interp *const i)
{
long offset;
struct nw_i_sm_b *const b = &i->sm.bytecode;
static const char *const exc = "invalid opcode";
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = cfg->tell(&offset, cfg->user);
if (n)
return n;
offset -= sizeof b->op;
#ifdef NW_LOG
nwp_log("%s: %#x, offset=%#lx\n", exc, (unsigned)b->op, offset);
#endif
i->exception = exc;
return NW_FATAL;
}
static enum nw_state get_bytecode(struct nw_interp *const i)
{
struct nw_i_sm_b *const b = &i->sm.bytecode;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_io_read(cfg, &b->io, cfg->user);
if (n)
return n;
else if (b->op >= nwp_ops.n || !(b->f = nwp_ops.ops[b->op]))
{
i->next = tell;
return NW_AGAIN;
}
i->next = nwp_execute;
return NW_AGAIN;
}
void nwp_interp_full(struct nw_interp *const i)
{
struct nw_i_sm_b *const pb = &i->sm.bytecode, b = {0};
b.io.buf = &pb->op;
b.io.n = sizeof pb->op;
*pb = b;
i->next = get_bytecode;
}
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