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// Metamethods for structs
#include <stdint.h>
#include <string.h>
#include "arrays.h"
#include "bools.h"
#include "channels.h"
#include "functiontype.h"
#include "metamethods.h"
#include "optionals.h"
#include "pointers.h"
#include "siphash.h"
#include "tables.h"
#include "text.h"
#include "util.h"
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstack-protector"
PUREFUNC public uint64_t Struct$hash(const void *obj, const TypeInfo_t *type)
{
if (type->StructInfo.num_fields == 0)
return 0;
if (type->StructInfo.num_fields == 1)
return generic_hash(obj, type->StructInfo.fields[0].type);
uint32_t field_hashes[type->StructInfo.num_fields] = {};
ptrdiff_t byte_offset = 0;
ptrdiff_t bit_offset = 0;
for (int i = 0; i < type->StructInfo.num_fields; i++) {
NamedType_t field = type->StructInfo.fields[i];
if (field.type == &Bool$info) {
bool b = ((*(char*)(obj + byte_offset)) >> bit_offset) & 0x1;
field_hashes[i] = (uint32_t)b;
bit_offset += 1;
if (bit_offset >= 8) {
byte_offset += 1;
bit_offset = 0;
}
} else {
if (bit_offset > 0) {
byte_offset += 1;
bit_offset = 0;
}
if (field.type->align && byte_offset % field.type->align > 0)
byte_offset += field.type->align - (byte_offset % field.type->align);
field_hashes[i] = generic_hash(obj + byte_offset, field.type);
byte_offset += field.type->size;
}
}
return siphash24((void*)field_hashes, sizeof(field_hashes));
}
#pragma GCC diagnostic pop
PUREFUNC public int32_t Struct$compare(const void *x, const void *y, const TypeInfo_t *type)
{
if (x == y)
return 0;
ptrdiff_t byte_offset = 0;
ptrdiff_t bit_offset = 0;
for (int i = 0; i < type->StructInfo.num_fields; i++) {
NamedType_t field = type->StructInfo.fields[i];
if (field.type == &Bool$info) {
bool bx = ((*(char*)(x + byte_offset)) >> bit_offset) & 0x1;
bool by = ((*(char*)(y + byte_offset)) >> bit_offset) & 0x1;
if (bx != by)
return (int32_t)bx - (int32_t)by;
bit_offset += 1;
if (bit_offset >= 8) {
byte_offset += 1;
bit_offset = 0;
}
} else {
if (bit_offset > 0) {
byte_offset += 1;
bit_offset = 0;
}
if (field.type->align && byte_offset % field.type->align > 0)
byte_offset += field.type->align - (byte_offset % field.type->align);
int32_t cmp = generic_compare(x + byte_offset, y + byte_offset, field.type);
if (cmp != 0)
return cmp;
byte_offset += field.type->size;
}
}
return 0;
}
PUREFUNC public bool Struct$equal(const void *x, const void *y, const TypeInfo_t *type)
{
if (x == y)
return true;
ptrdiff_t byte_offset = 0;
ptrdiff_t bit_offset = 0;
for (int i = 0; i < type->StructInfo.num_fields; i++) {
NamedType_t field = type->StructInfo.fields[i];
if (field.type == &Bool$info) {
bool bx = ((*(char*)(x + byte_offset)) >> bit_offset) & 0x1;
bool by = ((*(char*)(y + byte_offset)) >> bit_offset) & 0x1;
if (bx != by)
return false;
bit_offset += 1;
if (bit_offset >= 8) {
byte_offset += 1;
bit_offset = 0;
}
} else {
if (bit_offset > 0) {
byte_offset += 1;
bit_offset = 0;
}
if (field.type->align && byte_offset % field.type->align > 0)
byte_offset += field.type->align - (byte_offset % field.type->align);
if (!generic_equal(x + byte_offset, y + byte_offset, field.type))
return false;
byte_offset += field.type->size;
}
}
return true;
}
PUREFUNC public Text_t Struct$as_text(const void *obj, bool colorize, const TypeInfo_t *type)
{
if (!obj) return Text$from_str(type->StructInfo.name);
if (type->StructInfo.is_secret)
return Text$format(colorize ? "\x1b[0;1m%s\x1b[m(...)" : "%s(...)", type->StructInfo.name);
Text_t text = Text$format(colorize ? "\x1b[0;1m%s\x1b[m(" : "%s(", type->StructInfo.name);
ptrdiff_t byte_offset = 0;
ptrdiff_t bit_offset = 0;
for (int i = 0; i < type->StructInfo.num_fields; i++) {
NamedType_t field = type->StructInfo.fields[i];
if (i > 0)
text = Text$concat(text, Text(", "));
if (type->StructInfo.num_fields > 1)
text = Text$concat(text, Text$from_str(field.name), Text("="));
if (field.type == &Bool$info) {
bool b = ((*(char*)(obj + byte_offset)) >> bit_offset) & 0x1;
text = Text$concat(text, Text$from_str(colorize ? (b ? "\x1b[35myes\x1b[m" : "\x1b[35mno\x1b[m") : (b ? "yes" : "no")));
bit_offset += 1;
if (bit_offset >= 8) {
byte_offset += 1;
bit_offset = 0;
}
} else {
if (bit_offset > 0) {
byte_offset += 1;
bit_offset = 0;
}
if (field.type->align && byte_offset % field.type->align > 0)
byte_offset += field.type->align - (byte_offset % field.type->align);
text = Text$concat(text, generic_as_text(obj + byte_offset, colorize, field.type));
byte_offset += field.type->size;
}
}
return Text$concat(text, Text(")"));
}
PUREFUNC public bool Struct$is_none(const void *obj, const TypeInfo_t *type)
{
return *(bool*)(obj + type->size);
}
// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0
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