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Abolish QueryVTable in favour of more assoc items on QueryConfig

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This may introduce additional mono _but_ may help const fold things
better and especially may help not constructing a `QueryVTable` anymore
which is cheap but not free.
This commit is contained in:
Nilstrieb 2022-12-30 23:25:19 +01:00
parent e5e5fcb0b7
commit 9fe4efe115
5 changed files with 95 additions and 114 deletions
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1
compiler/rustc_query_impl/src/lib.rs
View File

@ -34,7 +34,6 @@ use rustc_query_system::query::*;
pub use rustc_query_system::query::{deadlock, QueryContext};
pub use rustc_query_system::query::QueryConfig;
pub(crate) use rustc_query_system::query::QueryVTable;
mod on_disk_cache;
pub use on_disk_cache::OnDiskCache;

42
compiler/rustc_query_impl/src/plumbing.rs
View File

@ -493,28 +493,32 @@ macro_rules! define_queries {
&tcx.query_caches.$name
}
#[inline]
fn make_vtable(tcx: QueryCtxt<'tcx>, key: &Self::Key) ->
QueryVTable<QueryCtxt<'tcx>, Self::Key, Self::Value>
{
let compute = get_provider!([$($modifiers)*][tcx, $name, key]);
let cache_on_disk = Self::cache_on_disk(tcx.tcx, key);
QueryVTable {
anon: is_anon!([$($modifiers)*]),
eval_always: is_eval_always!([$($modifiers)*]),
depth_limit: depth_limit!([$($modifiers)*]),
feedable: feedable!([$($modifiers)*]),
dep_kind: dep_graph::DepKind::$name,
hash_result: hash_result!([$($modifiers)*]),
handle_cycle_error: handle_cycle_error!([$($modifiers)*]),
compute,
try_load_from_disk: if cache_on_disk { should_ever_cache_on_disk!([$($modifiers)*]) } else { None },
}
fn execute_query(tcx: TyCtxt<'tcx>, key: Self::Key) -> Self::Stored {
tcx.$name(key)
}
fn execute_query(tcx: TyCtxt<'tcx>, k: Self::Key) -> Self::Stored {
tcx.$name(k)
#[inline]
// key is only sometimes used
#[allow(unused_variables)]
fn compute(qcx: QueryCtxt<'tcx>, key: &Self::Key) -> fn(TyCtxt<'tcx>, Self::Key) -> Self::Value {
get_provider!([$($modifiers)*][qcx, $name, key])
}
#[inline]
fn try_load_from_disk(qcx: QueryCtxt<'tcx>, key: &Self::Key) -> rustc_query_system::query::TryLoadFromDisk<QueryCtxt<'tcx>, Self> {
let cache_on_disk = Self::cache_on_disk(qcx.tcx, key);
if cache_on_disk { should_ever_cache_on_disk!([$($modifiers)*]) } else { None }
}
const ANON: bool = is_anon!([$($modifiers)*]);
const EVAL_ALWAYS: bool = is_eval_always!([$($modifiers)*]);
const DEPTH_LIMIT: bool = depth_limit!([$($modifiers)*]);
const FEEDABLE: bool = feedable!([$($modifiers)*]);
const DEP_KIND: rustc_middle::dep_graph::DepKind = dep_graph::DepKind::$name;
const HANDLE_CYCLE_ERROR: rustc_query_system::HandleCycleError = handle_cycle_error!([$($modifiers)*]);
const HASH_RESULT: rustc_query_system::query::HashResult<QueryCtxt<'tcx>, Self> = hash_result!([$($modifiers)*]);
})*
#[allow(nonstandard_style)]

51
compiler/rustc_query_system/src/query/config.rs
View File

@ -1,7 +1,6 @@
//! Query configuration and description traits.
use crate::dep_graph::DepNode;
use crate::dep_graph::SerializedDepNodeIndex;
use crate::dep_graph::{DepNode, DepNodeParams, SerializedDepNodeIndex};
use crate::error::HandleCycleError;
use crate::ich::StableHashingContext;
use crate::query::caches::QueryCache;
@ -11,10 +10,16 @@ use rustc_data_structures::fingerprint::Fingerprint;
use std::fmt::Debug;
use std::hash::Hash;
pub type HashResult<Qcx, Q> =
Option<fn(&mut StableHashingContext<'_>, &<Q as QueryConfig<Qcx>>::Value) -> Fingerprint>;
pub type TryLoadFromDisk<Qcx, Q> =
Option<fn(Qcx, SerializedDepNodeIndex) -> Option<<Q as QueryConfig<Qcx>>::Value>>;
pub trait QueryConfig<Qcx: QueryContext> {
const NAME: &'static str;
type Key: Eq + Hash + Clone + Debug;
type Key: DepNodeParams<Qcx::DepContext> + Eq + Hash + Clone + Debug;
type Value: Debug;
type Stored: Debug + Clone + std::borrow::Borrow<Self::Value>;
@ -30,39 +35,27 @@ pub trait QueryConfig<Qcx: QueryContext> {
where
Qcx: 'a;
// Don't use this method to compute query results, instead use the methods on TyCtxt
fn make_vtable(tcx: Qcx, key: &Self::Key) -> QueryVTable<Qcx, Self::Key, Self::Value>;
fn cache_on_disk(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(tcx: Qcx::DepContext, k: Self::Key) -> Self::Stored;
}
#[derive(Copy, Clone)]
pub struct QueryVTable<Qcx: QueryContext, K, V> {
pub anon: bool,
pub dep_kind: Qcx::DepKind,
pub eval_always: bool,
pub depth_limit: bool,
pub feedable: bool,
fn compute(tcx: Qcx, key: &Self::Key) -> fn(Qcx::DepContext, Self::Key) -> Self::Value;
pub compute: fn(Qcx::DepContext, K) -> V,
pub hash_result: Option<fn(&mut StableHashingContext<'_>, &V) -> Fingerprint>,
pub handle_cycle_error: HandleCycleError,
// NOTE: this is also `None` if `cache_on_disk()` returns false, not just if it's unsupported by the query
pub try_load_from_disk: Option<fn(Qcx, SerializedDepNodeIndex) -> Option<V>>,
}
fn try_load_from_disk(qcx: Qcx, idx: &Self::Key) -> TryLoadFromDisk<Qcx, Self>;
impl<Qcx: QueryContext, K, V> QueryVTable<Qcx, K, V> {
pub(crate) fn to_dep_node(&self, tcx: Qcx::DepContext, key: &K) -> DepNode<Qcx::DepKind>
where
K: crate::dep_graph::DepNodeParams<Qcx::DepContext>,
{
DepNode::construct(tcx, self.dep_kind, key)
}
const ANON: bool;
const EVAL_ALWAYS: bool;
const DEPTH_LIMIT: bool;
const FEEDABLE: bool;
pub(crate) fn compute(&self, tcx: Qcx::DepContext, key: K) -> V {
(self.compute)(tcx, key)
const DEP_KIND: Qcx::DepKind;
const HANDLE_CYCLE_ERROR: HandleCycleError;
const HASH_RESULT: HashResult<Qcx, Self>;
// Just here for convernience and checking that the key matches the kind, don't override this.
fn construct_dep_node(tcx: Qcx::DepContext, key: &Self::Key) -> DepNode<Qcx::DepKind> {
DepNode::construct(tcx, Self::DEP_KIND, key)
}
}

2
compiler/rustc_query_system/src/query/mod.rs
View File

@ -12,7 +12,7 @@ pub use self::caches::{
};
mod config;
pub use self::config::{QueryConfig, QueryVTable};
pub use self::config::{HashResult, QueryConfig, TryLoadFromDisk};
use crate::dep_graph::DepKind;
use crate::dep_graph::{DepNodeIndex, HasDepContext, SerializedDepNodeIndex};

113
compiler/rustc_query_system/src/query/plumbing.rs
View File

@ -2,10 +2,9 @@
//! generate the actual methods on tcx which find and execute the provider,
//! manage the caches, and so forth.
use crate::dep_graph::{DepContext, DepKind, DepNode, DepNodeIndex, DepNodeParams};
use crate::dep_graph::{DepContext, DepKind, DepNode, DepNodeIndex};
use crate::ich::StableHashingContext;
use crate::query::caches::QueryCache;
use crate::query::config::QueryVTable;
use crate::query::job::{report_cycle, QueryInfo, QueryJob, QueryJobId, QueryJobInfo};
use crate::query::{QueryContext, QueryMap, QuerySideEffects, QueryStackFrame};
use crate::values::Value;
@ -361,36 +360,34 @@ where
})
}
fn try_execute_query<Qcx, C>(
fn try_execute_query<Q, Qcx>(
qcx: Qcx,
state: &QueryState<C::Key, Qcx::DepKind>,
cache: &C,
state: &QueryState<Q::Key, Qcx::DepKind>,
cache: &Q::Cache,
span: Span,
key: C::Key,
key: Q::Key,
dep_node: Option<DepNode<Qcx::DepKind>>,
query: &QueryVTable<Qcx, C::Key, C::Value>,
) -> (C::Stored, Option<DepNodeIndex>)
) -> (Q::Stored, Option<DepNodeIndex>)
where
C: QueryCache,
C::Key: Clone + DepNodeParams<Qcx::DepContext>,
C::Value: Value<Qcx::DepContext, Qcx::DepKind>,
C::Stored: Debug + std::borrow::Borrow<C::Value>,
Q: QueryConfig<Qcx>,
Qcx: QueryContext,
{
match JobOwner::<'_, C::Key, Qcx::DepKind>::try_start(&qcx, state, span, key.clone()) {
match JobOwner::<'_, Q::Key, Qcx::DepKind>::try_start(&qcx, state, span, key.clone()) {
TryGetJob::NotYetStarted(job) => {
let (result, dep_node_index) = execute_job(qcx, key.clone(), dep_node, query, job.id);
if query.feedable {
let (result, dep_node_index) =
execute_job::<Q, Qcx>(qcx, key.clone(), dep_node, job.id);
if Q::FEEDABLE {
// We may have put a value inside the cache from inside the execution.
// Verify that it has the same hash as what we have now, to ensure consistency.
let _ = cache.lookup(&key, |cached_result, _| {
let hasher = query.hash_result.expect("feedable forbids no_hash");
let hasher = Q::HASH_RESULT.expect("feedable forbids no_hash");
let old_hash = qcx.dep_context().with_stable_hashing_context(|mut hcx| hasher(&mut hcx, cached_result.borrow()));
let new_hash = qcx.dep_context().with_stable_hashing_context(|mut hcx| hasher(&mut hcx, &result));
debug_assert_eq!(
old_hash, new_hash,
"Computed query value for {:?}({:?}) is inconsistent with fed value,\ncomputed={:#?}\nfed={:#?}",
query.dep_kind, key, result, cached_result,
Q::DEP_KIND, key, result, cached_result,
);
});
}
@ -398,7 +395,7 @@ where
(result, Some(dep_node_index))
}
TryGetJob::Cycle(error) => {
let result = mk_cycle(qcx, error, query.handle_cycle_error, cache);
let result = mk_cycle(qcx, error, Q::HANDLE_CYCLE_ERROR, cache);
(result, None)
}
#[cfg(parallel_compiler)]
@ -417,16 +414,14 @@ where
}
}
fn execute_job<Qcx, K, V>(
fn execute_job<Q, Qcx>(
qcx: Qcx,
key: K,
key: Q::Key,
mut dep_node_opt: Option<DepNode<Qcx::DepKind>>,
query: &QueryVTable<Qcx, K, V>,
job_id: QueryJobId,
) -> (V, DepNodeIndex)
) -> (Q::Value, DepNodeIndex)
where
K: Clone + DepNodeParams<Qcx::DepContext>,
V: Debug,
Q: QueryConfig<Qcx>,
Qcx: QueryContext,
{
let dep_graph = qcx.dep_context().dep_graph();
@ -434,23 +429,23 @@ where
// Fast path for when incr. comp. is off.
if !dep_graph.is_fully_enabled() {
let prof_timer = qcx.dep_context().profiler().query_provider();
let result = qcx.start_query(job_id, query.depth_limit, None, || {
query.compute(*qcx.dep_context(), key)
let result = qcx.start_query(job_id, Q::DEPTH_LIMIT, None, || {
Q::compute(qcx, &key)(*qcx.dep_context(), key)
});
let dep_node_index = dep_graph.next_virtual_depnode_index();
prof_timer.finish_with_query_invocation_id(dep_node_index.into());
return (result, dep_node_index);
}
if !query.anon && !query.eval_always {
if !Q::ANON && !Q::EVAL_ALWAYS {
// `to_dep_node` is expensive for some `DepKind`s.
let dep_node =
dep_node_opt.get_or_insert_with(|| query.to_dep_node(*qcx.dep_context(), &key));
dep_node_opt.get_or_insert_with(|| Q::construct_dep_node(*qcx.dep_context(), &key));
// The diagnostics for this query will be promoted to the current session during
// `try_mark_green()`, so we can ignore them here.
if let Some(ret) = qcx.start_query(job_id, false, None, || {
try_load_from_disk_and_cache_in_memory(qcx, &key, &dep_node, query)
try_load_from_disk_and_cache_in_memory::<Q, Qcx>(qcx, &key, &dep_node)
}) {
return ret;
}
@ -460,18 +455,19 @@ where
let diagnostics = Lock::new(ThinVec::new());
let (result, dep_node_index) =
qcx.start_query(job_id, query.depth_limit, Some(&diagnostics), || {
if query.anon {
return dep_graph.with_anon_task(*qcx.dep_context(), query.dep_kind, || {
query.compute(*qcx.dep_context(), key)
qcx.start_query(job_id, Q::DEPTH_LIMIT, Some(&diagnostics), || {
if Q::ANON {
return dep_graph.with_anon_task(*qcx.dep_context(), Q::DEP_KIND, || {
Q::compute(qcx, &key)(*qcx.dep_context(), key)
});
}
// `to_dep_node` is expensive for some `DepKind`s.
let dep_node =
dep_node_opt.unwrap_or_else(|| query.to_dep_node(*qcx.dep_context(), &key));
dep_node_opt.unwrap_or_else(|| Q::construct_dep_node(*qcx.dep_context(), &key));
dep_graph.with_task(dep_node, *qcx.dep_context(), key, query.compute, query.hash_result)
let task = Q::compute(qcx, &key);
dep_graph.with_task(dep_node, *qcx.dep_context(), key, task, Q::HASH_RESULT)
});
prof_timer.finish_with_query_invocation_id(dep_node_index.into());
@ -480,7 +476,7 @@ where
let side_effects = QuerySideEffects { diagnostics };
if std::intrinsics::unlikely(!side_effects.is_empty()) {
if query.anon {
if Q::ANON {
qcx.store_side_effects_for_anon_node(dep_node_index, side_effects);
} else {
qcx.store_side_effects(dep_node_index, side_effects);
@ -490,16 +486,14 @@ where
(result, dep_node_index)
}
fn try_load_from_disk_and_cache_in_memory<Qcx, K, V>(
fn try_load_from_disk_and_cache_in_memory<Q, Qcx>(
qcx: Qcx,
key: &K,
key: &Q::Key,
dep_node: &DepNode<Qcx::DepKind>,
query: &QueryVTable<Qcx, K, V>,
) -> Option<(V, DepNodeIndex)>
) -> Option<(Q::Value, DepNodeIndex)>
where
K: Clone,
Q: QueryConfig<Qcx>,
Qcx: QueryContext,
V: Debug,
{
// Note this function can be called concurrently from the same query
// We must ensure that this is handled correctly.
@ -511,7 +505,7 @@ where
// First we try to load the result from the on-disk cache.
// Some things are never cached on disk.
if let Some(try_load_from_disk) = query.try_load_from_disk {
if let Some(try_load_from_disk) = Q::try_load_from_disk(qcx, &key) {
let prof_timer = qcx.dep_context().profiler().incr_cache_loading();
// The call to `with_query_deserialization` enforces that no new `DepNodes`
@ -545,7 +539,7 @@ where
if std::intrinsics::unlikely(
try_verify || qcx.dep_context().sess().opts.unstable_opts.incremental_verify_ich,
) {
incremental_verify_ich(*qcx.dep_context(), &result, dep_node, query.hash_result);
incremental_verify_ich(*qcx.dep_context(), &result, dep_node, Q::HASH_RESULT);
}
return Some((result, dep_node_index));
@ -565,7 +559,7 @@ where
let prof_timer = qcx.dep_context().profiler().query_provider();
// The dep-graph for this computation is already in-place.
let result = dep_graph.with_ignore(|| query.compute(*qcx.dep_context(), key.clone()));
let result = dep_graph.with_ignore(|| Q::compute(qcx, key)(*qcx.dep_context(), key.clone()));
prof_timer.finish_with_query_invocation_id(dep_node_index.into());
@ -578,7 +572,7 @@ where
//
// See issue #82920 for an example of a miscompilation that would get turned into
// an ICE by this check
incremental_verify_ich(*qcx.dep_context(), &result, dep_node, query.hash_result);
incremental_verify_ich(*qcx.dep_context(), &result, dep_node, Q::HASH_RESULT);
Some((result, dep_node_index))
}
@ -699,23 +693,19 @@ fn incremental_verify_ich_failed(sess: &Session, dep_node: DebugArg<'_>, result:
///
/// Note: The optimization is only available during incr. comp.
#[inline(never)]
fn ensure_must_run<Qcx, K, V>(
qcx: Qcx,
key: &K,
query: &QueryVTable<Qcx, K, V>,
) -> (bool, Option<DepNode<Qcx::DepKind>>)
fn ensure_must_run<Q, Qcx>(qcx: Qcx, key: &Q::Key) -> (bool, Option<DepNode<Qcx::DepKind>>)
where
K: crate::dep_graph::DepNodeParams<Qcx::DepContext>,
Q: QueryConfig<Qcx>,
Qcx: QueryContext,
{
if query.eval_always {
if Q::EVAL_ALWAYS {
return (true, None);
}
// Ensuring an anonymous query makes no sense
assert!(!query.anon);
assert!(!Q::ANON);
let dep_node = query.to_dep_node(*qcx.dep_context(), key);
let dep_node = Q::construct_dep_node(*qcx.dep_context(), key);
let dep_graph = qcx.dep_context().dep_graph();
match dep_graph.try_mark_green(qcx, &dep_node) {
@ -746,13 +736,11 @@ pub fn get_query<Q, Qcx, D>(qcx: Qcx, span: Span, key: Q::Key, mode: QueryMode)
where
D: DepKind,
Q: QueryConfig<Qcx>,
Q::Key: DepNodeParams<Qcx::DepContext>,
Q::Value: Value<Qcx::DepContext, D>,
Qcx: QueryContext,
{
let query = Q::make_vtable(qcx, &key);
let dep_node = if let QueryMode::Ensure = mode {
let (must_run, dep_node) = ensure_must_run(qcx, &key, &query);
let (must_run, dep_node) = ensure_must_run::<Q, _>(qcx, &key);
if !must_run {
return None;
}
@ -761,14 +749,13 @@ where
None
};
let (result, dep_node_index) = try_execute_query(
let (result, dep_node_index) = try_execute_query::<Q, Qcx>(
qcx,
Q::query_state(qcx),
Q::query_cache(qcx),
span,
key,
dep_node,
&query,
);
if let Some(dep_node_index) = dep_node_index {
qcx.dep_context().dep_graph().read_index(dep_node_index)
@ -780,7 +767,6 @@ pub fn force_query<Q, Qcx, D>(qcx: Qcx, key: Q::Key, dep_node: DepNode<Qcx::DepK
where
D: DepKind,
Q: QueryConfig<Qcx>,
Q::Key: DepNodeParams<Qcx::DepContext>,
Q::Value: Value<Qcx::DepContext, D>,
Qcx: QueryContext,
{
@ -798,9 +784,8 @@ where
Err(()) => {}
}
let query = Q::make_vtable(qcx, &key);
let state = Q::query_state(qcx);
debug_assert!(!query.anon);
debug_assert!(!Q::ANON);
try_execute_query(qcx, state, cache, DUMMY_SP, key, Some(dep_node), &query);
try_execute_query::<Q, _>(qcx, state, cache, DUMMY_SP, key, Some(dep_node));
}