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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/sections.h>
#include <nw/types.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
int check_resizable_limits(FILE *const f, struct resizable_limits *const r)
{
varuint1 flags;
varuint32 initial;
*r = (const struct resizable_limits){0};
if (varuint1_read(f, &flags))
{
LOG("%s: varuint1_read failed\n", __func__);
return -1;
}
else if (varuint32_read(f, &initial))
{
LOG("%s: varuint32_read failed\n", __func__);
return -1;
}
if (flags)
{
varuint32 maximum;
if (varuint32_read(f, &maximum))
{
LOG("%s: varuint32_read failed\n", __func__);
return -1;
}
r->max = maximum;
r->max_available = true;
}
static const unsigned long page_size = 64lu * 1024lu;
if (initial > UINT32_MAX / page_size)
{
LOG("%s: initial size (%lu) overflow \n", __func__,
(unsigned long)initial);
return 1;
}
r->sz = initial * page_size;
return 0;
}
size_t get_type_size(const enum value_type type)
{
static const size_t list[] =
{
[VALUE_TYPE_I32] = sizeof (int32_t),
[VALUE_TYPE_I64] = sizeof (int64_t),
[VALUE_TYPE_F32] = sizeof (float),
[VALUE_TYPE_F64] = sizeof (double)
};
return list[type];
}
enum
{
I32 = 0x7f,
I64 = 0x7e,
F32 = 0x7d,
F64 = 0x7c,
ANYFUNC = 0x70,
FUNC = 0x60,
BLOCK_TYPE = 0x40
};
int get_value_type(const varint7 type, enum value_type *const vtype)
{
static const struct size
{
varint7 type;
enum value_type vtype;
} sizes[] =
{
{.type = I32, .vtype = VALUE_TYPE_I32},
{.type = I64, .vtype = VALUE_TYPE_I64},
{.type = F32, .vtype = VALUE_TYPE_F32},
{.type = F64, .vtype = VALUE_TYPE_F64},
/* TODO: check this. */
{.type = ANYFUNC, .vtype = VALUE_TYPE_I32},
/* TODO: check this. */
{.type = FUNC, .vtype = VALUE_TYPE_I32},
/* TODO: check this. */
{.type = BLOCK_TYPE, .vtype = VALUE_TYPE_I32}
};
for (size_t i = 0; i < sizeof sizes / sizeof *sizes; i++)
{
const struct size *const s = &sizes[i];
if (type == s->type)
{
*vtype = s->vtype;
return 0;
}
}
LOG("%s: unknown type %#hhx\n", __func__, (char)type);
return -1;
}
static int32_t swap_i32(const int32_t in)
{
const int8_t *const p = (const int8_t *)∈
return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
}
int32_t htoni32(const int32_t in)
{
return swap_i32(in);
}
int32_t ntohi32(const int32_t in)
{
return swap_i32(in);
}
const char *value_type_tostr(const enum value_type v)
{
static const char *const s[] =
{
#define X(x) [x] = #x,
VALUE_TYPES
#undef X
};
return s[v];
}
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