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introduce Ownership to list layout

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This commit is contained in:
Folkert 2020-07-30 13:42:47 +02:00
parent d784f62cd3
commit 22471167d3
5 changed files with 213 additions and 16 deletions
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25
compiler/mono/src/layout.rs
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@ -27,6 +27,20 @@ pub enum Layout<'a> {
Pointer(&'a Layout<'a>),
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Copy)]
pub enum Ownership {
/// The default. Object is reference counted
Owned,
/// Do not update reference counter, surrounding context
/// keeps this value alive
Borrowed,
/// Object is unique, can be mutated in-place and
/// is not reference counted
Unique,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum Builtin<'a> {
Int128,
@ -42,7 +56,7 @@ pub enum Builtin<'a> {
Str,
Map(&'a Layout<'a>, &'a Layout<'a>),
Set(&'a Layout<'a>),
List(&'a Layout<'a>),
List(Ownership, &'a Layout<'a>),
EmptyStr,
EmptyList,
EmptyMap,
@ -219,7 +233,7 @@ impl<'a> Builtin<'a> {
Str | EmptyStr => Builtin::STR_WORDS * pointer_size,
Map(_, _) | EmptyMap => Builtin::MAP_WORDS * pointer_size,
Set(_) | EmptySet => Builtin::SET_WORDS * pointer_size,
List(_) | EmptyList => Builtin::LIST_WORDS * pointer_size,
List(_, _) | EmptyList => Builtin::LIST_WORDS * pointer_size,
}
}
@ -229,7 +243,7 @@ impl<'a> Builtin<'a> {
match self {
Int128 | Int64 | Int32 | Int16 | Int8 | Int1 | Float128 | Float64 | Float32
| Float16 | EmptyStr | EmptyMap | EmptyList | EmptySet => true,
Str | Map(_, _) | Set(_) | List(_) => false,
Str | Map(_, _) | Set(_) | List(_, _) => false,
}
}
}
@ -696,7 +710,10 @@ pub fn list_layout_from_elem<'a>(
let elem_layout = Layout::new(arena, content, subs, pointer_size)?;
// This is a normal list.
Ok(Layout::Builtin(Builtin::List(arena.alloc(elem_layout))))
Ok(Layout::Builtin(Builtin::List(
Ownership::Owned,
arena.alloc(elem_layout),
)))
}
}
}