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//! Query configuration and description traits.
use crate::dep_graph::{DepNode, DepNodeParams, SerializedDepNodeIndex};
use crate::error::HandleCycleError;
use crate::ich::StableHashingContext;
use crate::query::caches::QueryCache;
use crate::query::{QueryContext, QueryInfo, QueryState};
use rustc_data_structures::fingerprint::Fingerprint;
use std::fmt::Debug;
use std::hash::Hash;
pub type HashResult<V> = Option<fn(&mut StableHashingContext<'_>, &V) -> Fingerprint>;
pub type TryLoadFromDisk<Qcx, V> = Option<fn(Qcx, SerializedDepNodeIndex) -> Option<V>>;
pub trait QueryConfig<Qcx: QueryContext>: Copy {
fn name(self) -> &'static str;
// `Key` and `Value` are `Copy` instead of `Clone` to ensure copying them stays cheap,
// but it isn't necessary.
type Key: DepNodeParams<Qcx::DepContext> + Eq + Hash + Copy + Debug;
type Value: Copy;
type Cache: QueryCache<Key = Self::Key, Value = Self::Value>;
fn format_value(self) -> fn(&Self::Value) -> String;
// Don't use this method to access query results, instead use the methods on TyCtxt
fn query_state<'a>(self, tcx: Qcx) -> &'a QueryState<Self::Key, Qcx::DepKind>
where
Qcx: 'a;
// Don't use this method to access query results, instead use the methods on TyCtxt
fn query_cache<'a>(self, tcx: Qcx) -> &'a Self::Cache
where
Qcx: 'a;
fn cache_on_disk(self, tcx: Qcx::DepContext, key: &Self::Key) -> bool;
// Don't use this method to compute query results, instead use the methods on TyCtxt
fn execute_query(self, tcx: Qcx::DepContext, k: Self::Key) -> Self::Value;
fn compute(self, tcx: Qcx, key: Self::Key) -> Self::Value;
fn try_load_from_disk(self, qcx: Qcx, idx: &Self::Key) -> TryLoadFromDisk<Qcx, Self::Value>;
fn loadable_from_disk(self, qcx: Qcx, key: &Self::Key, idx: SerializedDepNodeIndex) -> bool;
/// Synthesize an error value to let compilation continue after a cycle.
fn value_from_cycle_error(
self,
tcx: Qcx::DepContext,
cycle: &[QueryInfo<Qcx::DepKind>],
) -> Self::Value;
fn anon(self) -> bool;
fn eval_always(self) -> bool;
fn depth_limit(self) -> bool;
fn feedable(self) -> bool;
fn dep_kind(self) -> Qcx::DepKind;
fn handle_cycle_error(self) -> HandleCycleError;
fn hash_result(self) -> HashResult<Self::Value>;
// Just here for convernience and checking that the key matches the kind, don't override this.
fn construct_dep_node(self, tcx: Qcx::DepContext, key: &Self::Key) -> DepNode<Qcx::DepKind> {
DepNode::construct(tcx, self.dep_kind(), key)
}
}
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