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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/log.h>
#include <nw/routines.h>
#include <nw/stack.h>
#include <nw/types.h>
#include <limits.h>
static enum nw_state read_meta(struct nw_interp *const i)
{
struct nw_find_local *const f = i->state;
const struct nw_local_meta *const m = &f->meta;
const nw_varuint32 index = f->index - f->entry_i;
const enum nw_state n = nwp_stack_read(i, &f->io, f->addr);
size_t sz;
nw_varuint32 count;
if (n)
return n;
f->addr += sizeof f->meta;
count = m->entry_count;
if (nwp_type_sz(m->type, &sz))
{
static const char *const exc = "invalid type";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %#x\n", exc, (unsigned)m->type);
#endif
return NW_FATAL;
}
else if (index < count)
{
const size_t offset = sz * index;
if (f->addr > ULONG_MAX - offset)
{
static const char *const exc = "out-of-bounds access to local";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: addr: %lu, offset: %lu\n", exc,
(unsigned long)f->addr, (unsigned long)offset);
#endif
return NW_FATAL;
}
else if ((f->addr += offset) >= i->fr.local_end)
{
static const char *const exc = "invalid local index";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %lu\n", exc, (unsigned long)f->index);
#endif
return NW_FATAL;
}
i->next = f->next;
}
else
{
const size_t offset = sz * count;
f->entry_i += count;
if (f->addr > ULONG_MAX - offset)
{
static const char *const exc = "out-of-bounds access to local";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: addr: %lu, offset: %lu\n", exc,
(unsigned long)f->addr, (unsigned long)offset);
#endif
return NW_FATAL;
}
else if ((f->addr += offset) >= i->fr.local_end)
{
static const char *const exc = "invalid local index";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %lu\n", exc, (unsigned long)f->index);
#endif
return NW_FATAL;
}
else
{
struct nw_sm_io io = {0};
io.buf = &f->meta;
io.n = sizeof f->meta;
f->io = io;
}
}
return NW_AGAIN;
}
void nwp_find_local(struct nw_interp *const i, struct nw_find_local *const f,
const nw_varuint32 index, enum nw_state (*const next)(struct nw_interp *),
void *const args)
{
const struct nw_find_local fl = {0};
*f = fl;
f->index = index;
f->next = next;
f->addr = i->fr.local_start;
f->io.buf = &f->meta;
f->io.n = sizeof f->meta;
i->state = f;
i->args = args;
i->next = read_meta;
}
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