107 lines
3.4 KiB
Rust
107 lines
3.4 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(crate) 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 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 cache_on_disk: fn(CTX, &K, Option<&V>) -> bool,
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pub try_load_from_disk: 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 cache_on_disk(&self, tcx: CTX, key: &K, value: Option<&V>) -> bool {
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(self.cache_on_disk)(tcx, key, value)
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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)(tcx, index)
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}
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}
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pub trait QueryAccessors<CTX: QueryContext>: QueryConfig {
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const ANON: bool;
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const EVAL_ALWAYS: bool;
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const DEP_KIND: CTX::DepKind;
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const HASH_RESULT: Option<
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fn(hcx: &mut StableHashingContext<'_>, result: &Self::Value) -> Fingerprint,
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>;
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type Cache: QueryCache<Key = Self::Key, Stored = Self::Stored, Value = Self::Value>;
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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 compute_fn(tcx: CTX, key: &Self::Key) -> fn(CTX::DepContext, Self::Key) -> Self::Value;
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fn handle_cycle_error(tcx: CTX, diag: DiagnosticBuilder<'_>) -> Self::Value;
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}
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pub trait QueryDescription<CTX: QueryContext>: QueryAccessors<CTX> {
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fn describe(tcx: CTX, key: Self::Key) -> String;
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#[inline]
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fn cache_on_disk(_: CTX, _: &Self::Key, _: Option<&Self::Value>) -> bool {
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false
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}
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fn try_load_from_disk(_: CTX, _: SerializedDepNodeIndex) -> Option<Self::Value> {
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panic!("QueryDescription::load_from_disk() called for an unsupported query.")
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}
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}
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pub(crate) trait QueryVtableExt<CTX: QueryContext, K, V> {
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const VTABLE: QueryVtable<CTX, K, V>;
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}
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impl<CTX, Q> QueryVtableExt<CTX, Q::Key, Q::Value> for Q
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where
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CTX: QueryContext,
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Q: QueryDescription<CTX>,
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{
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const VTABLE: QueryVtable<CTX, Q::Key, Q::Value> = QueryVtable {
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anon: Q::ANON,
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dep_kind: Q::DEP_KIND,
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eval_always: Q::EVAL_ALWAYS,
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hash_result: Q::HASH_RESULT,
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handle_cycle_error: Q::handle_cycle_error,
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cache_on_disk: Q::cache_on_disk,
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try_load_from_disk: Q::try_load_from_disk,
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};
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}
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