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use InternIndex also to represent indices from the user

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This commit is contained in:
Niko Matsakis 2019-03-13 05:18:23 -04:00
parent 71f250d037
commit 7ed24f0fa3
1 changed files with 17 additions and 6 deletions
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23
src/interned.rs
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@ -90,6 +90,9 @@ impl InternKey for usize {
}
/// Newtype indicating an index into the intern table.
///
/// NB. In some cases, `InternIndex` values come directly from the
/// user and hence they are not 'trusted' to be valid or in-bounds.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
struct InternIndex {
index: u32,
@ -103,8 +106,16 @@ impl InternIndex {
impl From<usize> for InternIndex {
fn from(v: usize) -> Self {
assert!(v < (std::u32::MAX as usize));
InternIndex { index: v as u32 }
InternIndex { index: v.as_u32() }
}
}
impl<T> From<&T> for InternIndex
where
T: InternKey,
{
fn from(v: &T) -> Self {
InternIndex { index: v.as_u32() }
}
}
@ -345,10 +356,10 @@ where
fn lookup_value<R>(
&self,
db: &DB,
index: u32,
index: InternIndex,
op: impl FnOnce(&Q::Key) -> R,
) -> StampedValue<R> {
let index = index as usize;
let index = index.index();
let revision_now = db.salsa_runtime().current_revision();
{
@ -514,7 +525,7 @@ where
key: &Q::Key,
database_key: &DB::DatabaseKey,
) -> Result<Q::Value, CycleDetected> {
let index: u32 = key.as_u32();
let index = InternIndex::from(key);
let group_storage = <DB as HasQueryGroup<Q::Group>>::group_storage(db);
let interned_storage = IQ::query_storage(group_storage);
@ -534,7 +545,7 @@ where
key: &Q::Key,
_database_key: &DB::DatabaseKey,
) -> bool {
let index: u32 = key.as_u32();
let index = InternIndex::from(key);
// FIXME -- This seems maybe not quite right, as it will panic
// if `key` has been removed from the map since, but it should