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/*
* nanowasm, a tiny WebAssembly/Wasm interpreter
* Copyright (C) 2023-2024 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/log.h>
#include <nw/ops.h>
#include <nanowasm/nw.h>
#include <nw/interp.h>
#include <nw/types.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
static int push(struct nw_interp *const i, FILE *const f)
{
const long pc = ftell(f);
if (pc < 0)
{
LOG("%s: ftell(3): %s\n", __func__, strerror(errno));
i->exception = "I/O error";
return -1;
}
struct nw_frame *const fp = i->fp;
struct nw_block *const p = interp_stackptr(i);
const struct nw_block b =
{
.pc = pc,
.prev = fp->last_block
};
if (interp_stack_push(i, &b, sizeof b))
{
LOG("%s: interp_stack_push failed\n", __func__);
return -1;
}
fp->last_block = p;
return 0;
}
static int op(struct nw_interp *const i, FILE *const f)
{
varint7 sig;
if (varint7_read(f, &sig))
{
LOG("%s: varint7_read failed\n", __func__);
return -1;
}
else if (i && push(i, f))
{
LOG("%s: push failed\n", __func__);
return -1;
}
return 0;
}
int op_block(struct nw_interp *const i)
{
return op(i, i->f);
}
int check_block(FILE *const f)
{
return op(NULL, f);
}
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