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// Metamethods are methods that all types share for hashing, equality, comparison, and textifying
#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 ignored "-Wstack-protector"
PUREFUNC public uint64_t generic_hash(const void *obj, const TypeInfo_t *type)
{
switch (type->tag) {
case TextInfo: return Text$hash((void*)obj);
case ArrayInfo: return Array$hash(obj, type);
case ChannelInfo: return Channel$hash((Channel_t**)obj, type);
case TableInfo: return Table$hash(obj, type);
case OptionalInfo: return is_null(obj, type->OptionalInfo.type) ? 0 : generic_hash(obj, type->OptionalInfo.type);
case StructInfo: {
if (type->StructInfo.num_fields == 0) {
return 0;
} else if (type->StructInfo.num_fields == 1) {
return generic_hash(obj, type->StructInfo.fields[0].type);
} else {
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$info) {
bool b = ((*(char*)(obj + byte_offset)) >> bit_offset) & 0x1;
field_hashes[i] = (uint32_t)b;
bit_offset += 1;
if (bit_offset >= 8) {
byte_offset += 1;
bit_offset = 0;
}
} else {
if (bit_offset > 0) {
byte_offset += 1;
bit_offset = 0;
}
if (field.type->align && byte_offset % field.type->align > 0)
byte_offset += field.type->align - (byte_offset % field.type->align);
field_hashes[i] = generic_hash(obj + byte_offset, field.type);
byte_offset += field.type->size;
}
}
return siphash24((void*)field_hashes, sizeof(field_hashes));
}
}
case EnumInfo: {
int32_t tag = *(int32_t*)obj;
uint32_t components[2] = {(uint32_t)tag, 0};
const TypeInfo_t *value = type->EnumInfo.tags[tag-1].type;
if (value && value->size > 0) {
ptrdiff_t byte_offset = sizeof(int32_t);
if (value->align && byte_offset % value->align > 0)
byte_offset += value->align - (byte_offset % value->align);
components[1] = generic_hash(obj + byte_offset, value);
}
return siphash24((void*)components, sizeof(components));
}
case CustomInfo: case CStringInfo: // These all share the same info
if (!type->CustomInfo.hash)
goto hash_data;
return type->CustomInfo.hash(obj, type);
case PointerInfo: case FunctionInfo: case TypeInfoInfo: case OpaqueInfo: default: {
hash_data:;
return siphash24((void*)obj, (size_t)(type->size));
}
}
}
PUREFUNC public int32_t generic_compare(const void *x, const void *y, const TypeInfo_t *type)
{
if (x == y) return 0;
switch (type->tag) {
case PointerInfo: case FunctionInfo: return Pointer$compare(x, y, type);
case TextInfo: return Text$compare(x, y);
case ArrayInfo: return Array$compare(x, y, type);
case ChannelInfo: return Channel$compare((Channel_t**)x, (Channel_t**)y, type);
case TableInfo: return Table$compare(x, y, type);
case OptionalInfo: {
bool x_is_null = is_null(x, type->OptionalInfo.type);
bool y_is_null = is_null(y, type->OptionalInfo.type);
if (x_is_null && y_is_null) return 0;
else if (x_is_null != y_is_null) return (int32_t)y_is_null - (int32_t)x_is_null;
else return generic_compare(x, y, type->OptionalInfo.type);
}
case StructInfo: {
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$info) {
bool bx = ((*(char*)(x + byte_offset)) >> bit_offset) & 0x1;
bool by = ((*(char*)(y + byte_offset)) >> bit_offset) & 0x1;
if (bx != by)
return (int32_t)bx - (int32_t)by;
bit_offset += 1;
if (bit_offset >= 8) {
byte_offset += 1;
bit_offset = 0;
}
} else {
if (bit_offset > 0) {
byte_offset += 1;
bit_offset = 0;
}
if (field.type->align && byte_offset % field.type->align > 0)
byte_offset += field.type->align - (byte_offset % field.type->align);
int32_t cmp = generic_compare(x + byte_offset, y + byte_offset, field.type);
if (cmp != 0)
return cmp;
byte_offset += field.type->size;
}
}
return 0;
}
case EnumInfo: {
int32_t x_tag = *(int32_t*)x;
int32_t y_tag = *(int32_t*)y;
if (x_tag != y_tag)
return x_tag > y_tag ? 1 : -1;
const TypeInfo_t *value = type->EnumInfo.tags[x_tag-1].type;
if (value && value->size > 0) {
ptrdiff_t byte_offset = sizeof(int32_t);
if (value->align && byte_offset % value->align > 0)
byte_offset += value->align - (byte_offset % value->align);
return generic_compare(x + byte_offset, y + byte_offset, value);
}
return 0;
}
case CustomInfo: case CStringInfo: // These all share the same info
if (!type->CustomInfo.compare)
goto compare_data;
return type->CustomInfo.compare(x, y, type);
case TypeInfoInfo: case OpaqueInfo: default:
compare_data:
return (int32_t)memcmp((void*)x, (void*)y, (size_t)(type->size));
}
}
PUREFUNC public bool generic_equal(const void *x, const void *y, const TypeInfo_t *type)
{
if (x == y) return true;
switch (type->tag) {
case PointerInfo: case FunctionInfo: return Pointer$equal(x, y, type);
case TextInfo: return Text$equal(x, y);
case ArrayInfo: return Array$equal(x, y, type);
case ChannelInfo: return Channel$equal((Channel_t**)x, (Channel_t**)y, type);
case TableInfo: return Table$equal(x, y, type);
case OptionalInfo: {
bool x_is_null = is_null(x, type->OptionalInfo.type);
bool y_is_null = is_null(y, type->OptionalInfo.type);
if (x_is_null && y_is_null) return true;
else if (x_is_null != y_is_null) return false;
else return generic_equal(x, y, type->OptionalInfo.type);
}
case StructInfo: case EnumInfo:
return (generic_compare(x, y, type) == 0);
case CustomInfo: case CStringInfo: // These all share the same info
if (!type->CustomInfo.equal)
goto use_generic_compare;
return type->CustomInfo.equal(x, y, type);
case TypeInfoInfo: case OpaqueInfo: default:
use_generic_compare:
return (generic_compare(x, y, type) == 0);
}
}
public Text_t generic_as_text(const void *obj, bool colorize, const TypeInfo_t *type)
{
switch (type->tag) {
case PointerInfo: return Pointer$as_text(obj, colorize, type);
case FunctionInfo: return Func$as_text(obj, colorize, type);
case TextInfo: return Text$as_text(obj, colorize, type);
case ArrayInfo: return Array$as_text(obj, colorize, type);
case ChannelInfo: return Channel$as_text((Channel_t**)obj, colorize, type);
case TableInfo: return Table$as_text(obj, colorize, type);
case TypeInfoInfo: return Type$as_text(obj, colorize, type);
case OptionalInfo: return Optional$as_text(obj, colorize, type);
case StructInfo: {
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$concat(text, Text(")"));
}
case EnumInfo: {
if (!obj) return Text$from_str(type->EnumInfo.name);
int32_t tag = *(int32_t*)obj;
NamedType_t value = type->EnumInfo.tags[tag-1];
if (!value.type || value.type->size == 0)
return Text$format(colorize ? "\x1b[36;1m%s\x1b[m.\x1b[1m%s\x1b[m" : "%s.%s", type->EnumInfo.name, value.name);
ptrdiff_t byte_offset = sizeof(int32_t);
if (value.type->align && byte_offset % value.type->align > 0)
byte_offset += value.type->align - (byte_offset % value.type->align);
return Text$concat(Text$format(colorize ? "\x1b[36;1m%s\x1b[m." : "%s.", type->EnumInfo.name),
generic_as_text(obj + byte_offset, colorize, value.type));
}
case CustomInfo: case CStringInfo: // These all share the same info
if (!type->CustomInfo.as_text)
fail("No text function provided for type!\n");
return type->CustomInfo.as_text(obj, colorize, type);
case OpaqueInfo: return Text("???");
default: fail("Invalid type tag: %d", type->tag);
}
}
public int generic_print(const void *obj, bool colorize, const TypeInfo_t *type)
{
Text_t text = generic_as_text(obj, colorize, type);
return Text$print(stdout, text) + printf("\n");
}
// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0
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