118 lines
2.9 KiB
Rust
118 lines
2.9 KiB
Rust
/// Alias for &TypeStruct to reduce repetition
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/// and make futura migration to interning
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/// easier
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pub type Type<'ty> = &'ty TypeStruct<'ty>;
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pub struct TypeStruct<'ty> {
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kind: TypeKind<'ty>,
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}
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enum TypeKind<'ty> {
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/// Elaboration-time types
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ElabType(ElabKind),
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/// Signal/Wire of generic width
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Logic(ElabData<'ty>),
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/// UInt of generic width
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UInt(ElabData<'ty>),
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/// Callable
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Callable,
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}
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struct ElabData<'ty> {
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typ: Type<'ty>,
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value: ElabValue<'ty>,
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}
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enum ElabValue<'ty> {
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/// the value is not given and has to be inferred
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Infer,
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/// the value is given as some byte representation
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Concrete(ElabValueData<'ty>),
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}
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enum ElabValueData<'ty> {
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U32(u32),
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Bytes(&'ty [u8]),
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}
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/// Types that are only valid during Elaboration
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enum ElabKind {
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/// general, unsized number type
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Num,
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}
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/// Helper functions to create primitive types
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impl<'ty> TypeStruct<'ty> {
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/// a logic signal with inferred width
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pub fn logic_infer() -> Self {
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Self {
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kind: TypeKind::Logic(ElabData {
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typ: &TypeStruct {
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kind: TypeKind::ElabType(ElabKind::Num),
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},
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value: ElabValue::Infer,
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}),
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}
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}
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/// a logic signal with known width
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pub fn logic_width(width: u32) -> Self {
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Self {
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kind: TypeKind::Logic(ElabData::from_u32(width)),
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}
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}
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/// return an elaboration number type
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pub fn elab_num() -> Self {
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Self {
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kind: TypeKind::ElabType(ElabKind::Num),
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}
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}
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pub fn bit_width(&self) -> Option<u32> {
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match &self.kind {
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// elab types are not representable in hardware
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TypeKind::ElabType(_) => None,
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TypeKind::Logic(data) => data.try_u32(),
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TypeKind::UInt(_) => todo!(),
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// callables are not representable in hardware
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TypeKind::Callable => None,
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}
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}
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pub fn genparam_count(&self) -> u32 {
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match self.kind {
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TypeKind::ElabType(_) => todo!(),
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TypeKind::Logic(_) => 1,
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TypeKind::UInt(_) => 1,
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TypeKind::Callable => todo!(),
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}
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}
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}
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/// Helper functions to create primitive elaboration values
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impl<'ty> ElabData<'ty> {
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/// an integer
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pub fn from_u32(val: u32) -> Self {
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Self {
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typ: &TypeStruct {
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kind: TypeKind::ElabType(ElabKind::Num),
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},
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value: ElabValue::Concrete(ElabValueData::U32(val)),
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}
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}
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/// return Some(u32) if this is a number
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pub fn try_u32(&self) -> Option<u32> {
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// TODO: assert this is actually a number
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match self.value {
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ElabValue::Infer => None,
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ElabValue::Concrete(_) => todo!(),
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}
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}
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}
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pub fn make_primitives() -> Vec<(String, TypeStruct<'static>)> {
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vec![("Logic".to_string(), TypeStruct::logic_infer())]
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}
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