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fayalite/crates/fayalite/src/bundle.rs

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// SPDX-License-Identifier: LGPL-3.0-or-later
// See Notices.txt for copyright information
use crate::{
expr::{ops::BundleLiteral, Expr, ToExpr},
intern::{
Intern, Interned, InternedCompare, Memoize, PtrEqWithTypeId, SupportsPtrEqWithTypeId,
},
module::{ModuleBuilder, NormalModule},
source_location::SourceLocation,
ty::{
CanonicalType, CanonicalTypeKind, CanonicalValue, Connect, DynCanonicalType,
DynCanonicalValue, DynType, FixedType, MatchVariantWithoutScope, Type, TypeEnum,
TypeWithDeref, Value, ValueEnum,
},
};
use bitvec::{slice::BitSlice, vec::BitVec};
use hashbrown::HashMap;
use std::{
fmt,
hash::{Hash, Hasher},
marker::PhantomData,
sync::Arc,
};
#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq)]
pub struct FieldType<T> {
pub name: Interned<str>,
pub flipped: bool,
pub ty: T,
}
pub struct FmtDebugInStruct<'a, T> {
field: &'a FieldType<T>,
field_offset: usize,
}
impl<T: fmt::Debug> fmt::Debug for FmtDebugInStruct<'_, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let Self {
field:
&FieldType {
name,
flipped,
ref ty,
},
field_offset,
} = *self;
if flipped {
write!(f, "#[hdl(flip)] ")?;
}
if f.alternate() {
writeln!(f, "/* offset = {field_offset} */")?;
}
write!(f, "{name}: ")?;
ty.fmt(f)
}
}
impl<T: fmt::Debug> fmt::Display for FmtDebugInStruct<'_, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Debug::fmt(self, f)
}
}
impl<T> FieldType<T> {
pub fn map_ty<U, F: FnOnce(T) -> U>(self, f: F) -> FieldType<U> {
let Self { name, flipped, ty } = self;
FieldType {
name,
flipped,
ty: f(ty),
}
}
pub fn as_ref_ty(&self) -> FieldType<&T> {
FieldType {
name: self.name,
flipped: self.flipped,
ty: &self.ty,
}
}
pub fn fmt_debug_in_struct(&self, field_offset: usize) -> FmtDebugInStruct<'_, T> {
FmtDebugInStruct {
field: self,
field_offset,
}
}
}
impl<T: Type> FieldType<T> {
pub fn canonical(&self) -> FieldType<T::CanonicalType> {
FieldType {
name: self.name,
flipped: self.flipped,
ty: self.ty.canonical(),
}
}
pub fn to_dyn(&self) -> FieldType<Interned<dyn DynType>> {
FieldType {
name: self.name,
flipped: self.flipped,
ty: self.ty.to_dyn(),
}
}
pub fn canonical_dyn(&self) -> FieldType<Interned<dyn DynCanonicalType>> {
FieldType {
name: self.name,
flipped: self.flipped,
ty: self.ty.canonical_dyn(),
}
}
}
impl FieldType<Interned<dyn DynCanonicalType>> {
pub fn from_canonical_type_helper<T: Type>(
self,
expected_name: &str,
expected_flipped: bool,
) -> T {
assert_eq!(&*self.name, expected_name, "field name doesn't match");
assert_eq!(
self.flipped, expected_flipped,
"field {expected_name} orientation (flipped or not) doesn't match"
);
let ty = &*self.ty;
if let Ok(ty) = <dyn DynCanonicalType>::downcast(ty) {
return T::from_canonical_type(ty);
}
let type_name = std::any::type_name::<T::CanonicalType>();
panic!("field {expected_name} type doesn't match, expected: {type_name:?}, got: {ty:?}");
}
}
#[derive(Clone, Eq)]
struct DynBundleTypeImpl {
fields: Interned<[FieldType<Interned<dyn DynCanonicalType>>]>,
name_indexes: HashMap<Interned<str>, usize>,
field_offsets: Interned<[usize]>,
is_passive: bool,
is_storable: bool,
is_castable_from_bits: bool,
bit_width: usize,
}
impl fmt::Debug for DynBundleTypeImpl {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "DynBundleType ")?;
f.debug_set()
.entries(
self.fields
.iter()
.enumerate()
.map(|(index, field)| field.fmt_debug_in_struct(self.field_offsets[index])),
)
.finish()
}
}
impl PartialEq for DynBundleTypeImpl {
fn eq(&self, other: &Self) -> bool {
self.fields == other.fields
}
}
impl Hash for DynBundleTypeImpl {
fn hash<H: Hasher>(&self, state: &mut H) {
self.fields.hash(state);
}
}
#[derive(Copy, Clone, Hash, PartialEq, Eq)]
pub struct DynBundleType(Interned<DynBundleTypeImpl>);
impl fmt::Debug for DynBundleType {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl DynBundleType {
pub fn new(fields: Interned<[FieldType<Interned<dyn DynCanonicalType>>]>) -> Self {
let is_passive = fields
.iter()
.all(|field| !field.flipped && field.ty.is_passive());
let is_storable = fields
.iter()
.all(|field| !field.flipped && field.ty.is_storable());
let is_castable_from_bits = fields
.iter()
.all(|field| !field.flipped && field.ty.is_castable_from_bits());
let mut name_indexes = HashMap::with_capacity(fields.len());
let mut field_offsets = Vec::with_capacity(fields.len());
let mut bit_width = 0usize;
for (index, &FieldType { name, ty, .. }) in fields.iter().enumerate() {
if let Some(old_index) = name_indexes.insert(name, index) {
panic!("duplicate field name {name:?}: at both index {old_index} and {index}");
}
field_offsets.push(bit_width);
bit_width = bit_width
.checked_add(ty.bit_width())
.unwrap_or_else(|| panic!("bundle is too big: bit-width overflowed"));
}
Self(
DynBundleTypeImpl {
fields,
name_indexes,
field_offsets: Intern::intern_owned(field_offsets),
is_passive,
is_storable,
is_castable_from_bits,
bit_width,
}
.intern_sized(),
)
}
pub fn is_passive(self) -> bool {
self.0.is_passive
}
pub fn is_storable(self) -> bool {
self.0.is_storable
}
pub fn is_castable_from_bits(self) -> bool {
self.0.is_castable_from_bits
}
pub fn bit_width(self) -> usize {
self.0.bit_width
}
pub fn name_indexes(&self) -> &HashMap<Interned<str>, usize> {
&self.0.name_indexes
}
pub fn field_by_name(
&self,
name: Interned<str>,
) -> Option<FieldType<Interned<dyn DynCanonicalType>>> {
Some(self.0.fields[*self.0.name_indexes.get(&name)?])
}
pub fn field_offsets(self) -> Interned<[usize]> {
self.0.field_offsets
}
}
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub struct DynBundle {
ty: DynBundleType,
fields: Arc<[DynCanonicalValue]>,
}
impl DynBundle {
pub fn new(ty: DynBundleType, fields: Arc<[DynCanonicalValue]>) -> Self {
assert_eq!(
ty.fields().len(),
fields.len(),
"field values don't match type"
);
for (field_ty, field) in ty.fields().iter().zip(fields.iter()) {
assert_eq!(field_ty.ty, field.ty(), "field value doesn't match type");
}
DynBundle { ty, fields }
}
pub fn fields(&self) -> &Arc<[DynCanonicalValue]> {
&self.fields
}
}
pub trait TypeHintTrait: Send + Sync + fmt::Debug + SupportsPtrEqWithTypeId {
fn matches(&self, ty: &dyn DynType) -> Result<(), String>;
}
impl InternedCompare for dyn TypeHintTrait {
type InternedCompareKey = PtrEqWithTypeId;
fn interned_compare_key_ref(this: &Self) -> Self::InternedCompareKey {
Self::get_ptr_eq_with_type_id(this)
}
fn interned_compare_key_weak(this: &std::sync::Weak<Self>) -> Self::InternedCompareKey {
Self::get_ptr_eq_with_type_id(&*this.upgrade().unwrap())
}
}
pub struct TypeHint<T: Type>(PhantomData<fn(T)>);
impl<T: Type> TypeHint<T> {
pub fn intern_dyn() -> Interned<dyn TypeHintTrait> {
Interned::cast_unchecked(
Self(PhantomData).intern_sized(),
|v| -> &dyn TypeHintTrait { v },
)
}
}
impl<T: Type> fmt::Debug for TypeHint<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "TypeHint<{}>", std::any::type_name::<T>())
}
}
impl<T: Type + Hash> Hash for TypeHint<T> {
fn hash<H: Hasher>(&self, _state: &mut H) {}
}
impl<T: Type> Eq for TypeHint<T> {}
impl<T: Type> PartialEq for TypeHint<T> {
fn eq(&self, _other: &Self) -> bool {
true
}
}
impl<T: Type> Clone for TypeHint<T> {
fn clone(&self) -> Self {
*self
}
}
impl<T: Type> Copy for TypeHint<T> {}
impl<T: Type> TypeHintTrait for TypeHint<T> {
fn matches(&self, ty: &dyn DynType) -> Result<(), String> {
match ty.downcast::<T>() {
Ok(_) => Ok(()),
Err(_) => Err(format!("can't cast {ty:?} to {self:?}")),
}
}
}
#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
pub struct FieldsHint {
pub known_fields: Interned<[FieldType<Interned<dyn TypeHintTrait>>]>,
pub more_fields: bool,
}
impl FieldsHint {
pub fn new(
known_fields: impl IntoIterator<Item = FieldType<Interned<dyn TypeHintTrait>>>,
more_fields: bool,
) -> Self {
let known_fields = Intern::intern_owned(Vec::from_iter(known_fields));
Self {
known_fields,
more_fields,
}
}
pub fn check_field(self, index: usize, field: FieldType<&dyn DynType>) -> Result<(), String> {
let Some(&known_field) = self.known_fields.get(index) else {
return if self.more_fields {
Ok(())
} else {
Err(format!(
"too many fields: name={:?} index={index}",
field.name
))
};
};
let FieldType {
name: known_name,
flipped: known_flipped,
ty: type_hint,
} = known_field;
let FieldType { name, flipped, ty } = field;
if name != known_name {
Err(format!(
"wrong field name {name:?}, expected {known_name:?}"
))
} else if flipped != known_flipped {
Err(format!(
"wrong field direction: flipped={flipped:?}, expected flipped={known_flipped}"
))
} else {
type_hint.matches(ty)
}
}
}
pub trait BundleType:
Type<CanonicalType = DynBundleType, CanonicalValue = DynBundle> + TypeWithDeref + Connect<Self>
where
Self::Value: BundleValue + ToExpr<Type = Self>,
{
type Builder;
fn builder() -> Self::Builder;
fn fields(&self) -> Interned<[FieldType<Interned<dyn DynCanonicalType>>]>;
fn fields_hint() -> FieldsHint;
}
pub trait BundleValue: Value
where
<Self as ToExpr>::Type: BundleType<Value = Self>,
{
fn to_bits_impl(this: &Self) -> Interned<BitSlice> {
#[derive(Hash, Eq, PartialEq)]
struct ToBitsMemoize<T>(PhantomData<T>);
impl<T> Clone for ToBitsMemoize<T> {
fn clone(&self) -> Self {
*self
}
}
impl<T> Copy for ToBitsMemoize<T> {}
impl<T: BundleValue<Type: BundleType<Value = T>>> Memoize for ToBitsMemoize<T> {
type Input = T;
type InputOwned = T;
type Output = Interned<BitSlice>;
fn inner(self, input: &Self::Input) -> Self::Output {
let input = input.to_canonical();
let mut bits = BitVec::with_capacity(input.ty.bit_width());
for field in input.fields.iter() {
bits.extend_from_bitslice(&field.to_bits());
}
Intern::intern_owned(bits)
}
}
ToBitsMemoize::<Self>(PhantomData).get(this)
}
}
pub struct DynBundleMatch;
impl Type for DynBundleType {
type CanonicalType = DynBundleType;
type Value = DynBundle;
type CanonicalValue = DynBundle;
type MaskType = DynBundleType;
type MaskValue = DynBundle;
type MatchVariant = DynBundleMatch;
type MatchActiveScope = ();
type MatchVariantAndInactiveScope = MatchVariantWithoutScope<Self::MatchVariant>;
type MatchVariantsIter = std::iter::Once<Self::MatchVariantAndInactiveScope>;
fn match_variants<IO: BundleValue>(
this: Expr<Self::Value>,
module_builder: &mut ModuleBuilder<IO, NormalModule>,
source_location: SourceLocation,
) -> Self::MatchVariantsIter
where
IO::Type: BundleType<Value = IO>,
{
let _ = this;
let _ = module_builder;
let _ = source_location;
std::iter::once(MatchVariantWithoutScope(DynBundleMatch))
}
fn mask_type(&self) -> Self::MaskType {
#[derive(Copy, Clone, Eq, PartialEq, Hash)]
struct Impl;
impl Memoize for Impl {
type Input = DynBundleType;
type InputOwned = DynBundleType;
type Output = DynBundleType;
fn inner(self, input: &Self::Input) -> Self::Output {
DynBundleType::new(Intern::intern_owned(Vec::from_iter(
input
.fields()
.iter()
.map(|&FieldType { name, flipped, ty }| FieldType {
name,
flipped,
ty: ty.mask_type().canonical(),
}),
)))
}
}
Impl.get(self)
}
fn canonical(&self) -> Self::CanonicalType {
*self
}
fn source_location(&self) -> SourceLocation {
SourceLocation::builtin()
}
fn type_enum(&self) -> TypeEnum {
TypeEnum::BundleType(*self)
}
fn from_canonical_type(t: Self::CanonicalType) -> Self {
t
}
fn as_dyn_canonical_type_impl(this: &Self) -> Option<&dyn DynCanonicalType> {
Some(this)
}
}
pub struct NoBuilder;
impl TypeWithDeref for DynBundleType {
fn expr_deref(this: &Expr<Self::Value>) -> &Self::MatchVariant {
let _ = this;
&DynBundleMatch
}
}
impl Connect<Self> for DynBundleType {}
impl BundleType for DynBundleType {
type Builder = NoBuilder;
fn builder() -> Self::Builder {
NoBuilder
}
fn fields(&self) -> Interned<[FieldType<Interned<dyn DynCanonicalType>>]> {
self.0.fields
}
fn fields_hint() -> FieldsHint {
FieldsHint {
known_fields: [][..].intern(),
more_fields: true,
}
}
}
impl CanonicalType for DynBundleType {
const CANONICAL_TYPE_KIND: CanonicalTypeKind = CanonicalTypeKind::BundleType;
}
impl ToExpr for DynBundle {
type Type = DynBundleType;
fn ty(&self) -> Self::Type {
self.ty
}
fn to_expr(&self) -> Expr<<Self::Type as Type>::Value> {
Expr::from_value(self)
}
}
impl Value for DynBundle {
fn to_canonical(&self) -> <Self::Type as Type>::CanonicalValue {
self.clone()
}
fn to_bits_impl(this: &Self) -> Interned<BitSlice> {
BundleValue::to_bits_impl(this)
}
}
impl BundleValue for DynBundle {}
impl CanonicalValue for DynBundle {
fn value_enum_impl(this: &Self) -> ValueEnum {
ValueEnum::Bundle(this.clone())
}
fn to_bits_impl(this: &Self) -> Interned<BitSlice> {
BundleValue::to_bits_impl(this)
}
}
macro_rules! impl_tuple_builder {
($builder:ident, [
$(($before_Ts:ident $before_fields:ident $before_members:literal))*
] [
($T:ident $field:ident $m:literal)
$(($after_Ts:ident $after_fields:ident $after_members:literal))*
]) => {
impl_tuple_builder!($builder, [
$(($before_Ts $before_fields $before_members))*
($T $field $m)
] [
$(($after_Ts $after_fields $after_members))*
]);
impl<Phantom, $($before_Ts,)* $($after_Ts,)*> $builder<Phantom, $($before_Ts,)* () $(, $after_Ts)*> {
pub fn $field<$T: ToExpr>(self, $field: $T) -> $builder<Phantom, $($before_Ts,)* Expr<<$T::Type as Type>::Value> $(, $after_Ts)*> {
let Self {
$($before_fields,)*
$field: _,
$($after_fields, )*
_phantom: _,
} = self;
let $field = $field.to_expr();
$builder {
$($before_fields,)*
$field,
$($after_fields,)*
_phantom: PhantomData,
}
}
}
};
($builder:ident, [$($before:tt)*] []) => {};
}
macro_rules! into_unit {
($($tt:tt)*) => {
()
};
}
macro_rules! impl_tuple {
($builder:ident, $(($T:ident $T2:ident $field:ident $m:tt)),*) => {
pub struct $builder<Phantom, $($T),*> {
$($field: $T,)*
_phantom: PhantomData<Phantom>,
}
impl_tuple_builder!($builder, [] [$(($T $field $m))*]);
impl<$($T: Value),*> $builder<($($T,)*), $(Expr<$T>,)*>
where
$($T::Type: Type<Value = $T>,)*
{
pub fn build(self) -> Expr<($($T,)*)> {
let Self {
$($field,)*
_phantom: _,
} = self;
BundleLiteral::new_unchecked(
[$($field.to_canonical_dyn()),*][..].intern(),
($($field.ty(),)*),
).to_expr()
}
}
impl<$($T: ToExpr,)*> ToExpr for ($($T,)*) {
type Type = ($($T::Type,)*);
#[allow(clippy::unused_unit)]
fn ty(&self) -> Self::Type {
let ($($field,)*) = self;
($($field.ty(),)*)
}
fn to_expr(&self) -> Expr<<Self::Type as Type>::Value> {
let ($($field,)*) = self;
$(let $field = $field.to_expr();)*
BundleLiteral::new_unchecked(
[$($field.to_canonical_dyn()),*][..].intern(),
($($field.ty(),)*),
).to_expr()
}
}
impl<$($T, $T2,)*> Connect<($($T2,)*)> for ($($T,)*)
where
$($T: Connect<$T2>,)*
{
}
impl<$($T: Type,)*> Type for ($($T,)*)
where
$($T::Value: Value<Type = $T>,)*
{
type CanonicalType = DynBundleType;
type Value = ($($T::Value,)*);
type CanonicalValue = DynBundle;
type MaskType = ($($T::MaskType,)*);
type MaskValue = ($($T::MaskValue,)*);
type MatchVariant = ($(Expr<$T::Value>,)*);
type MatchActiveScope = ();
type MatchVariantAndInactiveScope = MatchVariantWithoutScope<Self::MatchVariant>;
type MatchVariantsIter = std::iter::Once<Self::MatchVariantAndInactiveScope>;
fn match_variants<IO: BundleValue>(
this: Expr<Self::Value>,
module_builder: &mut ModuleBuilder<IO, NormalModule>,
source_location: SourceLocation,
) -> Self::MatchVariantsIter
where
IO::Type: BundleType<Value = IO>,
{
let _ = this;
let _ = module_builder;
let _ = source_location;
std::iter::once(MatchVariantWithoutScope(($(this.field(stringify!($m)),)*)))
}
#[allow(clippy::unused_unit)]
fn mask_type(&self) -> Self::MaskType {
let ($($field,)*) = self;
($($field.mask_type(),)*)
}
fn canonical(&self) -> Self::CanonicalType {
DynBundleType::new(self.fields())
}
fn source_location(&self) -> SourceLocation {
SourceLocation::builtin()
}
fn type_enum(&self) -> TypeEnum {
TypeEnum::BundleType(self.canonical())
}
#[allow(clippy::unused_unit)]
fn from_canonical_type(t: Self::CanonicalType) -> Self {
let [$($field),*] = *t.fields() else {
panic!("wrong number of fields");
};
($($field.from_canonical_type_helper(stringify!($m), false),)*)
}
}
impl<$($T: Type,)*> TypeWithDeref for ($($T,)*)
where
$($T::Value: Value<Type = $T>,)*
{
fn expr_deref(
this: &::fayalite::expr::Expr<<Self as ::fayalite::ty::Type>::Value>,
) -> &<Self as ::fayalite::ty::Type>::MatchVariant {
let _ = this;
Interned::<_>::into_inner(
Intern::intern_sized((
$(this.field(stringify!($m)),)*
)),
)
}
}
impl<$($T: Type,)*> BundleType for ($($T,)*)
where
$($T::Value: Value<Type = $T>,)*
{
type Builder = $builder<($($T::Value,)*), $(into_unit!($T),)*>;
fn builder() -> Self::Builder {
$builder {
$($field: (),)*
_phantom: PhantomData,
}
}
fn fields(
&self,
) -> Interned<[FieldType<Interned<dyn DynCanonicalType>>]> {
[
$(FieldType {
name: stringify!($m).intern(),
flipped: false,
ty: self.$m.canonical_dyn(),
},)*
][..].intern()
}
fn fields_hint() -> FieldsHint {
FieldsHint::new([
$(FieldType {
name: stringify!($m).intern(),
flipped: false,
ty: TypeHint::<$T>::intern_dyn(),
},)*
], false)
}
}
impl<$($T: FixedType,)*> FixedType for ($($T,)*)
where
$($T::Value: Value<Type = $T>,)*
{
#[allow(clippy::unused_unit)]
fn fixed_type() -> Self {
($($T::fixed_type(),)*)
}
}
impl<$($T: Value,)*> Value for ($($T,)*)
where
$($T::Type: Type<Value = $T>,)*
{
fn to_canonical(&self) -> <Self::Type as Type>::CanonicalValue {
let ty = self.ty().canonical();
DynBundle::new(
ty,
Arc::new([
$(self.$m.to_canonical_dyn(),)*
]),
)
}
fn to_bits_impl(this: &Self) -> Interned<BitSlice> {
BundleValue::to_bits_impl(this)
}
}
impl<$($T: Value,)*> BundleValue for ($($T,)*)
where
$($T::Type: Type<Value = $T>,)*
{
}
};
}
impl_tuple!(TupleBuilder0,);
impl_tuple!(TupleBuilder1, (A A2 field_0 0));
impl_tuple!(TupleBuilder2, (A A2 field_0 0), (B B2 field_1 1));
impl_tuple!(TupleBuilder3, (A A2 field_0 0), (B B2 field_1 1), (C C2 field_2 2));
impl_tuple!(TupleBuilder4, (A A2 field_0 0), (B B2 field_1 1), (C C2 field_2 2), (D D2 field_3 3));
impl_tuple!(TupleBuilder5, (A A2 field_0 0), (B B2 field_1 1), (C C2 field_2 2), (D D2 field_3 3), (E E2 field_4 4));
impl_tuple!(TupleBuilder6, (A A2 field_0 0), (B B2 field_1 1), (C C2 field_2 2), (D D2 field_3 3), (E E2 field_4 4), (F F2 field_5 5));
impl_tuple!(TupleBuilder7, (A A2 field_0 0), (B B2 field_1 1), (C C2 field_2 2), (D D2 field_3 3), (E E2 field_4 4), (F F2 field_5 5), (G G2 field_6 6));
impl_tuple!(TupleBuilder8, (A A2 field_0 0), (B B2 field_1 1), (C C2 field_2 2), (D D2 field_3 3), (E E2 field_4 4), (F F2 field_5 5), (G G2 field_6 6), (H H2 field_7 7));
impl_tuple!(TupleBuilder9, (A A2 field_0 0), (B B2 field_1 1), (C C2 field_2 2), (D D2 field_3 3), (E E2 field_4 4), (F F2 field_5 5), (G G2 field_6 6), (H H2 field_7 7), (I I2 field_8 8));
impl_tuple!(TupleBuilder10, (A A2 field_0 0), (B B2 field_1 1), (C C2 field_2 2), (D D2 field_3 3), (E E2 field_4 4), (F F2 field_5 5), (G G2 field_6 6), (H H2 field_7 7), (I I2 field_8 8), (J J2 field_9 9));
impl_tuple!(TupleBuilder11, (A A2 field_0 0), (B B2 field_1 1), (C C2 field_2 2), (D D2 field_3 3), (E E2 field_4 4), (F F2 field_5 5), (G G2 field_6 6), (H H2 field_7 7), (I I2 field_8 8), (J J2 field_9 9), (K K2 field_10 10));
impl_tuple!(TupleBuilder12, (A A2 field_0 0), (B B2 field_1 1), (C C2 field_2 2), (D D2 field_3 3), (E E2 field_4 4), (F F2 field_5 5), (G G2 field_6 6), (H H2 field_7 7), (I I2 field_8 8), (J J2 field_9 9), (K K2 field_10 10), (L L2 field_11 11));
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