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76 lines
2.5 KiB
Rust
76 lines
2.5 KiB
Rust
//! Query configuration and description traits.
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use crate::dep_graph::DepNode;
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use crate::dep_graph::SerializedDepNodeIndex;
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use crate::ich::StableHashingContext;
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use crate::query::caches::QueryCache;
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use crate::query::{QueryCacheStore, QueryContext, QueryState};
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use rustc_data_structures::fingerprint::Fingerprint;
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use rustc_errors::DiagnosticBuilder;
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use std::fmt::Debug;
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use std::hash::Hash;
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pub trait QueryConfig {
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const NAME: &'static str;
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type Key: Eq + Hash + Clone + Debug;
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type Value;
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type Stored: Clone;
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}
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pub struct QueryVtable<CTX: QueryContext, K, V> {
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pub anon: bool,
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pub dep_kind: CTX::DepKind,
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pub eval_always: bool,
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pub cache_on_disk: bool,
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pub compute: fn(CTX::DepContext, K) -> V,
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pub hash_result: Option<fn(&mut StableHashingContext<'_>, &V) -> Fingerprint>,
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pub handle_cycle_error: fn(CTX, DiagnosticBuilder<'_>) -> V,
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pub try_load_from_disk: Option<fn(CTX, SerializedDepNodeIndex) -> Option<V>>,
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}
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impl<CTX: QueryContext, K, V> QueryVtable<CTX, K, V> {
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pub(crate) fn to_dep_node(&self, tcx: CTX::DepContext, key: &K) -> DepNode<CTX::DepKind>
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where
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K: crate::dep_graph::DepNodeParams<CTX::DepContext>,
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{
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DepNode::construct(tcx, self.dep_kind, key)
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}
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pub(crate) fn compute(&self, tcx: CTX::DepContext, key: K) -> V {
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(self.compute)(tcx, key)
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}
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pub(crate) fn try_load_from_disk(&self, tcx: CTX, index: SerializedDepNodeIndex) -> Option<V> {
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self.try_load_from_disk
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.expect("QueryDescription::load_from_disk() called for an unsupported query.")(
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tcx, index,
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)
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}
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}
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pub trait QueryDescription<CTX: QueryContext>: QueryConfig {
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const TRY_LOAD_FROM_DISK: Option<fn(CTX, SerializedDepNodeIndex) -> Option<Self::Value>>;
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type Cache: QueryCache<Key = Self::Key, Stored = Self::Stored, Value = Self::Value>;
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fn describe(tcx: CTX, key: Self::Key) -> String;
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// Don't use this method to access query results, instead use the methods on TyCtxt
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fn query_state<'a>(tcx: CTX) -> &'a QueryState<CTX::DepKind, Self::Key>
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where
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CTX: 'a;
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// Don't use this method to access query results, instead use the methods on TyCtxt
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fn query_cache<'a>(tcx: CTX) -> &'a QueryCacheStore<Self::Cache>
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where
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CTX: 'a;
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// Don't use this method to compute query results, instead use the methods on TyCtxt
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fn make_vtable(tcx: CTX, key: &Self::Key) -> QueryVtable<CTX, Self::Key, Self::Value>;
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fn cache_on_disk(tcx: CTX::DepContext, key: &Self::Key) -> bool;
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}
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