Struct ra_ap_hir::db::ExprScopesQuery
source · pub struct ExprScopesQuery;
Implementations§
source§impl ExprScopesQuery
impl ExprScopesQuery
sourcepub fn in_db(self, db: &dyn DefDatabase) -> QueryTable<'_, ExprScopesQuery>
pub fn in_db(self, db: &dyn DefDatabase) -> QueryTable<'_, ExprScopesQuery>
Get access to extra methods pertaining to this query. You can also use it to invoke this query.
source§impl ExprScopesQuery
impl ExprScopesQuery
sourcepub fn in_db_mut(
self,
db: &mut dyn DefDatabase
) -> QueryTableMut<'_, ExprScopesQuery>
pub fn in_db_mut( self, db: &mut dyn DefDatabase ) -> QueryTableMut<'_, ExprScopesQuery>
Like in_db
, but gives access to methods for setting the
value of an input. Not applicable to derived queries.
§Threads, cancellation, and blocking
Mutating the value of a query cannot be done while there are
still other queries executing. If you are using your database
within a single thread, this is not a problem: you only have
&self
access to the database, but this method requires &mut self
.
However, if you have used snapshot
to create other threads,
then attempts to set
will block the current thread until
those snapshots are dropped (usually when those threads
complete). This also implies that if you create a snapshot but
do not send it to another thread, then invoking set
will
deadlock.
Before blocking, the thread that is attempting to set
will
also set a cancellation flag. This will cause any query
invocations in other threads to unwind with a Cancelled
sentinel value and eventually let the set
succeed once all
threads have unwound past the salsa invocation.
If your query implementations are performing expensive
operations without invoking another query, you can also use
the Runtime::unwind_if_cancelled
method to check for an
ongoing cancellation and bring those operations to a close,
thus allowing the set
to succeed. Otherwise, long-running
computations may lead to “starvation”, meaning that the
thread attempting to set
has to wait a long, long time. =)
Trait Implementations§
source§impl Debug for ExprScopesQuery
impl Debug for ExprScopesQuery
source§impl Default for ExprScopesQuery
impl Default for ExprScopesQuery
source§fn default() -> ExprScopesQuery
fn default() -> ExprScopesQuery
source§impl Query for ExprScopesQuery
impl Query for ExprScopesQuery
§type Key = DefWithBodyId
type Key = DefWithBodyId
§type Value = Arc<ExprScopes>
type Value = Arc<ExprScopes>
§type Storage = DerivedStorage<ExprScopesQuery, AlwaysMemoizeValue>
type Storage = DerivedStorage<ExprScopesQuery, AlwaysMemoizeValue>
source§const QUERY_INDEX: u16 = 23u16
const QUERY_INDEX: u16 = 23u16
source§const QUERY_NAME: &'static str = "expr_scopes"
const QUERY_NAME: &'static str = "expr_scopes"
foo
)source§fn query_storage<'a>(
group_storage: &'a <ExprScopesQuery as QueryDb<'_>>::GroupStorage
) -> &'a Arc<<ExprScopesQuery as Query>::Storage>
fn query_storage<'a>( group_storage: &'a <ExprScopesQuery as QueryDb<'_>>::GroupStorage ) -> &'a Arc<<ExprScopesQuery as Query>::Storage>
source§fn query_storage_mut<'a>(
group_storage: &'a <ExprScopesQuery as QueryDb<'_>>::GroupStorage
) -> &'a Arc<<ExprScopesQuery as Query>::Storage>
fn query_storage_mut<'a>( group_storage: &'a <ExprScopesQuery as QueryDb<'_>>::GroupStorage ) -> &'a Arc<<ExprScopesQuery as Query>::Storage>
source§impl<'d> QueryDb<'d> for ExprScopesQuery
impl<'d> QueryDb<'d> for ExprScopesQuery
§type DynDb = dyn DefDatabase + 'd
type DynDb = dyn DefDatabase + 'd
§type Group = DefDatabaseStorage
type Group = DefDatabaseStorage
§type GroupStorage = DefDatabaseGroupStorage__
type GroupStorage = DefDatabaseGroupStorage__
Auto Trait Implementations§
impl Freeze for ExprScopesQuery
impl RefUnwindSafe for ExprScopesQuery
impl Send for ExprScopesQuery
impl Sync for ExprScopesQuery
impl Unpin for ExprScopesQuery
impl UnwindSafe for ExprScopesQuery
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T> Cast for T
impl<T> Cast for T
source§fn cast<U>(self, interner: <U as HasInterner>::Interner) -> Uwhere
Self: CastTo<U>,
U: HasInterner,
fn cast<U>(self, interner: <U as HasInterner>::Interner) -> Uwhere
Self: CastTo<U>,
U: HasInterner,
U
using CastTo
.