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//! Query configuration and description traits.
use crate::dep_graph::DepNode;
use crate::dep_graph::SerializedDepNodeIndex;
use crate::query::caches::QueryCache;
use crate::query::plumbing::CycleError;
use crate::query::{QueryContext, QueryState};
use rustc_data_structures::profiling::ProfileCategory;
use rustc_span::def_id::DefId;
use rustc_data_structures::fingerprint::Fingerprint;
use std::borrow::Cow;
use std::fmt::Debug;
use std::hash::Hash;
// The parameter `CTX` is required in librustc_middle:
// implementations may need to access the `'tcx` lifetime in `CTX = TyCtxt<'tcx>`.
pub trait QueryConfig<CTX> {
const NAME: &'static str;
const CATEGORY: ProfileCategory;
type Key: Eq + Hash + Clone + Debug;
type Value: Clone;
}
pub trait QueryAccessors<CTX: QueryContext>: QueryConfig<CTX> {
const ANON: bool;
const EVAL_ALWAYS: bool;
const DEP_KIND: CTX::DepKind;
type Cache: QueryCache<Key = Self::Key, Value = Self::Value>;
// Don't use this method to access query results, instead use the methods on TyCtxt
fn query_state<'a>(tcx: CTX) -> &'a QueryState<CTX, Self::Cache>;
fn to_dep_node(tcx: CTX, key: &Self::Key) -> DepNode<CTX::DepKind>;
// Don't use this method to compute query results, instead use the methods on TyCtxt
fn compute(tcx: CTX, key: Self::Key) -> Self::Value;
fn hash_result(
hcx: &mut CTX::StableHashingContext,
result: &Self::Value,
) -> Option<Fingerprint>;
fn handle_cycle_error(tcx: CTX, error: CycleError<CTX::Query>) -> Self::Value;
}
pub trait QueryDescription<CTX: QueryContext>: QueryAccessors<CTX> {
fn describe(tcx: CTX, key: Self::Key) -> Cow<'static, str>;
#[inline]
fn cache_on_disk(_: CTX, _: Self::Key, _: Option<&Self::Value>) -> bool {
false
}
fn try_load_from_disk(_: CTX, _: SerializedDepNodeIndex) -> Option<Self::Value> {
panic!("QueryDescription::load_from_disk() called for an unsupported query.")
}
}
impl<CTX: QueryContext, M> QueryDescription<CTX> for M
where
M: QueryAccessors<CTX, Key = DefId>,
{
default fn describe(tcx: CTX, def_id: DefId) -> Cow<'static, str> {
if !tcx.verbose() {
format!("processing `{}`", tcx.def_path_str(def_id)).into()
} else {
let name = ::std::any::type_name::<M>();
format!("processing {:?} with query `{}`", def_id, name).into()
}
}
default fn cache_on_disk(_: CTX, _: Self::Key, _: Option<&Self::Value>) -> bool {
false
}
default fn try_load_from_disk(_: CTX, _: SerializedDepNodeIndex) -> Option<Self::Value> {
panic!("QueryDescription::load_from_disk() called for an unsupported query.")
}
}
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