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// Metamethods are methods that all types share for hashing, equality, comparison, and textifying
#include <stdint.h>
#include <string.h>
#include "lists.h"
#include "metamethods.h"
#include "siphash.h"
#include "tables.h"
#include "types.h"
#include "util.h"
PUREFUNC public uint64_t generic_hash(const void *obj, const TypeInfo_t *type) {
if (type->metamethods.hash) return type->metamethods.hash(obj, type);
return siphash24((void *)obj, (size_t)(type->size));
}
PUREFUNC public int32_t generic_compare(const void *x, const void *y, const TypeInfo_t *type) {
if (x == y) return 0;
if (type->metamethods.compare) return type->metamethods.compare(x, y, type);
return (int32_t)memcmp((void *)x, (void *)y, (size_t)(type->size));
}
PUREFUNC public bool generic_equal(const void *x, const void *y, const TypeInfo_t *type) {
if (x == y) return true;
if (type->metamethods.equal) return type->metamethods.equal(x, y, type);
return (generic_compare(x, y, type) == 0);
}
public
Text_t generic_as_text(const void *obj, bool colorize, const TypeInfo_t *type) {
if (!type->metamethods.as_text) fail("No text metamethod provided for type!");
return type->metamethods.as_text(obj, colorize, type);
}
public
void _serialize(const void *obj, FILE *out, Table_t *pointers, const TypeInfo_t *type) {
if (type->metamethods.serialize) return type->metamethods.serialize(obj, out, pointers, type);
fwrite(obj, (size_t)type->size, 1, out);
}
public
List_t generic_serialize(const void *x, const TypeInfo_t *type) {
char *buf = NULL;
size_t size = 0;
FILE *stream = open_memstream(&buf, &size);
Table_t pointers = EMPTY_TABLE;
_serialize(x, stream, &pointers, type);
fclose(stream);
List_t bytes = {
.data = GC_MALLOC_ATOMIC(size),
.length = (uint64_t)size,
.stride = 1,
.atomic = 1,
};
memcpy(bytes.data, buf, size);
free(buf);
return bytes;
}
public
void _deserialize(FILE *input, void *outval, List_t *pointers, const TypeInfo_t *type) {
if (type->metamethods.deserialize) {
type->metamethods.deserialize(input, outval, pointers, type);
return;
}
if (fread(outval, (size_t)type->size, 1, input) != 1) fail("Not enough data in stream to deserialize");
}
public
void generic_deserialize(List_t bytes, void *outval, const TypeInfo_t *type) {
if (bytes.stride != 1) List$compact(&bytes, 1);
FILE *input = fmemopen(bytes.data, (size_t)bytes.length, "r");
List_t pointers = EMPTY_LIST;
_deserialize(input, outval, &pointers, type);
fclose(input);
}
__attribute__((noreturn)) public
void cannot_serialize(const void *obj, FILE *out, Table_t *pointers, const TypeInfo_t *type) {
(void)obj, (void)out, (void)pointers;
Text_t typestr = generic_as_text(NULL, false, type);
fail("Values of type ", typestr, " cannot be serialized or deserialized!");
}
__attribute__((noreturn)) public
void cannot_deserialize(FILE *in, void *obj, List_t *pointers, const TypeInfo_t *type) {
(void)obj, (void)in, (void)pointers;
Text_t typestr = generic_as_text(NULL, false, type);
fail("Values of type ", typestr, " cannot be serialized or deserialized!");
}
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