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refactor Memo to just be parameterized over V

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This commit is contained in:
Niko Matsakis 2021-10-31 09:47:15 -04:00
parent 75ee3edd2e
commit 891a866653
1 changed files with 13 additions and 15 deletions
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28
src/derived/slot.rs
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@ -49,15 +49,12 @@ where
},
/// We have computed the query already, and here is the result.
Memoized(Memo<Q>),
Memoized(Memo<Q::Value>),
}
struct Memo<Q>
where
Q: QueryFunction,
{
struct Memo<V> {
/// The result of the query, if we decide to memoize it.
value: Option<Q::Value>,
value: Option<V>,
/// Revision information
revisions: MemoRevisions,
@ -220,7 +217,9 @@ where
// first things first, let's walk over each of our previous
// inputs and check whether they are out of date.
if let Some(memo) = &mut panic_guard.memo {
if let Some(value) = memo.validate_memoized_value(db, revision_now, &active_query) {
if let Some(value) =
memo.validate_memoized_value(db.ops_database(), revision_now, &active_query)
{
info!("{:?}: validated old memoized value", self,);
db.salsa_event(Event {
@ -649,7 +648,7 @@ where
{
database_key_index: DatabaseKeyIndex,
slot: &'me Slot<Q, MP>,
memo: Option<Memo<Q>>,
memo: Option<Memo<Q::Value>>,
runtime: &'me Runtime,
}
@ -661,7 +660,7 @@ where
fn new(
database_key_index: DatabaseKeyIndex,
slot: &'me Slot<Q, MP>,
memo: Option<Memo<Q>>,
memo: Option<Memo<Q::Value>>,
runtime: &'me Runtime,
) -> Self {
Self {
@ -737,9 +736,9 @@ where
}
}
impl<Q> Memo<Q>
impl<V> Memo<V>
where
Q: QueryFunction,
V: Clone,
{
/// Determines whether the memo is still valid in the current
/// revision. If needed, this will walk each dependency and
@ -750,20 +749,19 @@ where
/// takes the `active_query` argument as evidence.
fn validate_memoized_value(
&mut self,
db: &<Q as QueryDb<'_>>::DynDb,
db: &dyn Database,
revision_now: Revision,
active_query: &ActiveQueryGuard<'_>,
) -> Option<StampedValue<Q::Value>> {
) -> Option<StampedValue<V>> {
// If we don't have a memoized value, nothing to validate.
let value = match &self.value {
None => return None,
Some(v) => v,
};
let dyn_db = db.ops_database();
if self
.revisions
.validate_memoized_value(dyn_db, revision_now, active_query)
.validate_memoized_value(db, revision_now, active_query)
{
Some(StampedValue {
durability: self.revisions.durability,