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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 <stddef.h>
#include <stdio.h>
static int load(struct nw_interp *const i, const varuint32 flags,
const varuint32 offset)
{
enum {ALIGN = 2};
int32_t value_le;
if (flags != ALIGN)
{
LOG("%s: expected 32-bit alignment (%d), got %lu\n",
__func__, ALIGN, (unsigned long)flags);
i->exception = "unaligned access";
return -1;
}
else if (interp_heap_load(i, offset, &value_le, sizeof value_le))
{
LOG("%s: interp_heap_load failed\n", __func__);
return -1;
}
const int32_t value = ntohi32(value_le);
if (interp_stack_push(i, &value, sizeof value))
{
LOG("%s: interp_stack_push failed\n", __func__);
return -1;
}
return 0;
}
static int op(struct nw_interp *const i, FILE *const f)
{
varint32 flags, offset;
if (varint32_read(f, &flags))
{
LOG("%s: varint32_read flags failed\n", __func__);
return 1;
}
else if (varint32_read(f, &offset))
{
LOG("%s: varint32_read offset failed\n", __func__);
return 1;
}
else if (i && load(i, flags, offset))
{
LOG("%s: load failed\n", __func__);
return -1;
}
return 0;
}
int op_i32_load(struct nw_interp *const i)
{
return op(i, i->f);
}
int check_i32_load(FILE *const f)
{
return op(NULL, f);
}
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