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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/leb128.h>
#include <nw/log.h>
#include <nw/types.h>
#include <stdio.h>
int varuint1_read(FILE *const f, varuint1 *const out)
{
unsigned long long value;
if (leb128_read_unsigned(f, 1, &value))
return -1;
*out = value;
return 0;
}
int varint7_read(FILE *const f, varint7 *const out)
{
long long value;
if (leb128_read_signed(f, 7, &value))
return -1;
*out = value;
return 0;
}
int varuint7_read(FILE *const f, varuint7 *const out)
{
unsigned long long value;
if (leb128_read_unsigned(f, 7, &value))
return -1;
*out = value;
return 0;
}
int varuint32_read(FILE *const f, varuint32 *out)
{
unsigned long long value;
if (leb128_read_unsigned(f, 32, &value))
return -1;
*out = value;
return 0;
}
int varint32_read(FILE *const f, varint32 *const out)
{
long long value;
if (leb128_read_signed(f, 32, &value))
return -1;
*out = value;
return 0;
}
int varuint64_read(FILE *const f, varuint64 *const out)
{
unsigned long long value;
if (leb128_read_unsigned(f, 64, &value))
return -1;
*out = value;
return 0;
}
int varint64_read(FILE *const f, varint64 *const out)
{
long long value;
if (leb128_read_signed(f, 64, &value))
return -1;
*out = value;
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 little_endian_i32(const int32_t in)
{
const union
{
uint8_t a[4];
uint32_t b;
} v =
{
.b = in
};
return v.a[0] | (v.a[1] << 8l) | (v.a[2] << 16l) | (v.a[3] << 24l);
}
int32_t htoni32(const int32_t in)
{
return little_endian_i32(in);
}
int32_t ntohi32(const int32_t in)
{
return little_endian_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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