Struct QueryVTable 

pub struct QueryVTable<'tcx, C: QueryCache> {

    pub name: &'static str,
    pub eval_always: bool,
    pub dep_kind: DepKind,
    pub cycle_error_handling: CycleErrorHandling,
    pub query_state: usize,
    pub query_cache: usize,
    pub will_cache_on_disk_for_key_fn: Option<WillCacheOnDiskForKeyFn<'tcx, C::Key>>,
    pub call_query_method_fn: fn(tcx: TyCtxt<'tcx>, key: C::Key),
    pub invoke_provider_fn: fn(tcx: TyCtxt<'tcx>, key: C::Key) -> C::Value,
    pub try_load_from_disk_fn: Option<TryLoadFromDiskFn<'tcx, C::Key, C::Value>>,
    pub is_loadable_from_disk_fn: Option<IsLoadableFromDiskFn<'tcx, C::Key>>,
    pub hash_result: HashResult<C::Value>,
    pub value_from_cycle_error: fn(tcx: TyCtxt<'tcx>, cycle_error: &CycleError, guar: ErrorGuaranteed) -> C::Value,
    pub format_value: fn(&C::Value) -> String,
    pub description_fn: fn(TyCtxt<'tcx>, C::Key) -> String,
}

Stores function pointers and other metadata for a particular query.

Used indirectly by query plumbing in rustc_query_system via a trait, and also used directly by query plumbing in rustc_query_impl.

Fields

name: &'static str

eval_always: bool

dep_kind: DepKind

cycle_error_handling: CycleErrorHandling

How this query deals with query cycle errors.

query_state: usize

query_cache: usize

will_cache_on_disk_for_key_fn: Option<WillCacheOnDiskForKeyFn<'tcx, C::Key>>

call_query_method_fn: fn(tcx: TyCtxt<'tcx>, key: C::Key)

Function pointer that calls tcx.$query(key) for this query and discards the returned value.

This is a weird thing to be doing, and probably not what you want. It is used for loading query results from disk-cache in some cases.

invoke_provider_fn: fn(tcx: TyCtxt<'tcx>, key: C::Key) -> C::Value

Function pointer that actually calls this query’s provider. Also performs some associated secondary tasks; see the macro-defined implementation in mod invoke_provider_fn for more details.

This should be the only code that calls the provider function.

try_load_from_disk_fn: Option<TryLoadFromDiskFn<'tcx, C::Key, C::Value>>

is_loadable_from_disk_fn: Option<IsLoadableFromDiskFn<'tcx, C::Key>>

hash_result: HashResult<C::Value>

value_from_cycle_error: fn(tcx: TyCtxt<'tcx>, cycle_error: &CycleError, guar: ErrorGuaranteed) -> C::Value

format_value: fn(&C::Value) -> String

description_fn: fn(TyCtxt<'tcx>, C::Key) -> String

Formats a human-readable description of this query and its key, as specified by the desc query modifier.

Used when reporting query cycle errors and similar problems.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 112 bytes