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Fast-path for determining ability member impls for builtin opaques

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This commit is contained in:
Ayaz Hafiz 2023-03-20 16:05:10 -04:00
parent 297a571b34
commit e6094df69b
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GPG key ID: 0E2A37416A25EF58
8 changed files with 182 additions and 60 deletions
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32
crates/compiler/derive_key/src/lib.rs
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@ -52,7 +52,7 @@ impl DeriveKey {
}
}
#[derive(Hash, PartialEq, Eq, Debug)]
#[derive(Hash, Clone, PartialEq, Eq, Debug)]
pub enum Derived {
/// If a derived implementation name is well-known ahead-of-time, we can inline the symbol
/// directly rather than associating a key for an implementation to be made later on.
@ -123,4 +123,34 @@ impl Derived {
}
}
}
pub fn builtin_with_builtin_symbol(
builtin: DeriveBuiltin,
symbol: Symbol,
) -> Result<Self, DeriveError> {
match builtin {
DeriveBuiltin::ToEncoder => match encoding::FlatEncodable::from_builtin_symbol(symbol)?
{
FlatEncodable::Immediate(imm) => Ok(Derived::Immediate(imm)),
FlatEncodable::Key(repr) => Ok(Derived::Key(DeriveKey::ToEncoder(repr))),
},
DeriveBuiltin::Decoder => match decoding::FlatDecodable::from_builtin_symbol(symbol)? {
FlatDecodable::Immediate(imm) => Ok(Derived::Immediate(imm)),
FlatDecodable::Key(repr) => Ok(Derived::Key(DeriveKey::Decoder(repr))),
},
DeriveBuiltin::Hash => match hash::FlatHash::from_builtin_symbol(symbol)? {
FlatHash::SingleLambdaSetImmediate(imm) => {
Ok(Derived::SingleLambdaSetImmediate(imm))
}
FlatHash::Key(repr) => Ok(Derived::Key(DeriveKey::Hash(repr))),
},
DeriveBuiltin::IsEq => {
// If obligation checking passes, we always lower derived implementations of `isEq`
// to the `Eq` low-level, to be fulfilled by the backends.
Ok(Derived::SingleLambdaSetImmediate(
Symbol::BOOL_STRUCTURAL_EQ,
))
}
}
}
}