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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 execute(struct nw_interp *const i)
{
struct nw_i_sm_b *const b = &i->sm.bytecode;
const unsigned char op = b->op;
#ifdef NW_LOG
nwp_log("opcode: %s, pc=%#lx\n", nwp_op_tostr(op), b->pc);
#endif
i->fr.op = op;
b->f(i);
return NW_AGAIN;
}
static enum nw_state repeat(struct nw_interp *const i)
{
struct nw_i_sm_b *const b = &i->sm.bytecode;
struct nw_next *const next = &b->next;
const enum nw_state n = next->fn(next->user, next);
if (n == NW_FATAL)
{
static const char *const exc = "pc callback failed";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s, pc: %ld\n", exc, b->pc);
#endif
return NW_FATAL;
}
else if (n)
return n;
return execute(i);
}
static enum nw_state exec_pc(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 long pc = b->pc;
if (cfg->pc)
{
const enum nw_state n = cfg->pc(pc, &b->next, cfg->user);
if (n == NW_FATAL)
{
static const char *const exc = "pc callback failed";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s, pc: %ld\n", exc, pc);
#endif
return NW_FATAL;
}
else if (n)
{
i->next = repeat;
return n;
}
}
return execute(i);
}
enum nw_state nwp_execute(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 = cfg->tell(&b->pc, cfg->user);
if (n)
return n;
b->pc -= sizeof b->op;
i->next = exec_pc;
return NW_AGAIN;
}
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