588 lines
22 KiB
Rust
588 lines
22 KiB
Rust
//! The implementation of the query system itself. This defines the macros that
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//! generate the actual methods on tcx which find and execute the provider,
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//! manage the caches, and so forth.
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use crate::{on_disk_cache, queries, Queries};
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use rustc_middle::dep_graph::{DepKind, DepNode, DepNodeIndex, SerializedDepNodeIndex};
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use rustc_middle::ty::tls::{self, ImplicitCtxt};
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use rustc_middle::ty::{self, TyCtxt};
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use rustc_query_system::dep_graph::HasDepContext;
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use rustc_query_system::query::{
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QueryContext, QueryDescription, QueryJobId, QueryMap, QuerySideEffects,
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};
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use rustc_data_structures::sync::Lock;
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use rustc_data_structures::thin_vec::ThinVec;
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use rustc_errors::{Diagnostic, Handler};
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use rustc_serialize::opaque;
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use rustc_span::def_id::LocalDefId;
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use std::any::Any;
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#[derive(Copy, Clone)]
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pub struct QueryCtxt<'tcx> {
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pub tcx: TyCtxt<'tcx>,
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pub queries: &'tcx Queries<'tcx>,
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}
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impl<'tcx> std::ops::Deref for QueryCtxt<'tcx> {
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type Target = TyCtxt<'tcx>;
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#[inline]
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fn deref(&self) -> &Self::Target {
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&self.tcx
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}
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}
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impl HasDepContext for QueryCtxt<'tcx> {
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type DepKind = rustc_middle::dep_graph::DepKind;
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type StableHashingContext = rustc_middle::ich::StableHashingContext<'tcx>;
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type DepContext = TyCtxt<'tcx>;
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#[inline]
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fn dep_context(&self) -> &Self::DepContext {
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&self.tcx
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}
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}
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impl QueryContext for QueryCtxt<'tcx> {
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fn current_query_job(&self) -> Option<QueryJobId<Self::DepKind>> {
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tls::with_related_context(**self, |icx| icx.query)
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}
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fn try_collect_active_jobs(&self) -> Option<QueryMap<Self::DepKind>> {
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self.queries.try_collect_active_jobs(**self)
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}
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fn try_load_from_on_disk_cache(&self, dep_node: &DepNode) {
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let cb = &super::QUERY_CALLBACKS[dep_node.kind as usize];
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(cb.try_load_from_on_disk_cache)(*self, dep_node)
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}
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fn try_force_from_dep_node(&self, dep_node: &DepNode) -> bool {
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debug!("try_force_from_dep_node({:?}) --- trying to force", dep_node);
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// We must avoid ever having to call `force_from_dep_node()` for a
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// `DepNode::codegen_unit`:
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// Since we cannot reconstruct the query key of a `DepNode::codegen_unit`, we
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// would always end up having to evaluate the first caller of the
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// `codegen_unit` query that *is* reconstructible. This might very well be
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// the `compile_codegen_unit` query, thus re-codegenning the whole CGU just
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// to re-trigger calling the `codegen_unit` query with the right key. At
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// that point we would already have re-done all the work we are trying to
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// avoid doing in the first place.
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// The solution is simple: Just explicitly call the `codegen_unit` query for
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// each CGU, right after partitioning. This way `try_mark_green` will always
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// hit the cache instead of having to go through `force_from_dep_node`.
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// This assertion makes sure, we actually keep applying the solution above.
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debug_assert!(
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dep_node.kind != DepKind::codegen_unit,
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"calling force_from_dep_node() on DepKind::codegen_unit"
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);
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let cb = &super::QUERY_CALLBACKS[dep_node.kind as usize];
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(cb.force_from_dep_node)(*self, dep_node)
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}
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// Interactions with on_disk_cache
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fn load_side_effects(&self, prev_dep_node_index: SerializedDepNodeIndex) -> QuerySideEffects {
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self.queries
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.on_disk_cache
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.as_ref()
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.map(|c| c.load_side_effects(**self, prev_dep_node_index))
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.unwrap_or_default()
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}
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fn store_side_effects(&self, dep_node_index: DepNodeIndex, side_effects: QuerySideEffects) {
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if let Some(c) = self.queries.on_disk_cache.as_ref() {
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c.store_side_effects(dep_node_index, side_effects)
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}
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}
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fn store_side_effects_for_anon_node(
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&self,
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dep_node_index: DepNodeIndex,
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side_effects: QuerySideEffects,
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) {
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if let Some(c) = self.queries.on_disk_cache.as_ref() {
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c.store_side_effects_for_anon_node(dep_node_index, side_effects)
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}
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}
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/// Executes a job by changing the `ImplicitCtxt` to point to the
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/// new query job while it executes. It returns the diagnostics
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/// captured during execution and the actual result.
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#[inline(always)]
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fn start_query<R>(
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&self,
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token: QueryJobId<Self::DepKind>,
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diagnostics: Option<&Lock<ThinVec<Diagnostic>>>,
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compute: impl FnOnce() -> R,
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) -> R {
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// The `TyCtxt` stored in TLS has the same global interner lifetime
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// as `self`, so we use `with_related_context` to relate the 'tcx lifetimes
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// when accessing the `ImplicitCtxt`.
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tls::with_related_context(**self, move |current_icx| {
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// Update the `ImplicitCtxt` to point to our new query job.
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let new_icx = ImplicitCtxt {
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tcx: **self,
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query: Some(token),
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diagnostics,
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layout_depth: current_icx.layout_depth,
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task_deps: current_icx.task_deps,
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};
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// Use the `ImplicitCtxt` while we execute the query.
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tls::enter_context(&new_icx, |_| {
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rustc_data_structures::stack::ensure_sufficient_stack(compute)
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})
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})
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}
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}
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impl<'tcx> QueryCtxt<'tcx> {
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#[inline]
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pub fn from_tcx(tcx: TyCtxt<'tcx>) -> Self {
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let queries = tcx.queries.as_any();
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let queries = unsafe {
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let queries = std::mem::transmute::<&dyn Any, &dyn Any>(queries);
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let queries = queries.downcast_ref().unwrap();
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let queries = std::mem::transmute::<&Queries<'_>, &Queries<'_>>(queries);
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queries
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};
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QueryCtxt { tcx, queries }
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}
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crate fn on_disk_cache(self) -> Option<&'tcx on_disk_cache::OnDiskCache<'tcx>> {
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self.queries.on_disk_cache.as_ref()
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}
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#[cfg(parallel_compiler)]
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pub unsafe fn deadlock(self, registry: &rustc_rayon_core::Registry) {
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rustc_query_system::query::deadlock(self, registry)
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}
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pub(super) fn encode_query_results(
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self,
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encoder: &mut on_disk_cache::CacheEncoder<'a, 'tcx, opaque::FileEncoder>,
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query_result_index: &mut on_disk_cache::EncodedDepNodeIndex,
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) -> opaque::FileEncodeResult {
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macro_rules! encode_queries {
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($($query:ident,)*) => {
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$(
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on_disk_cache::encode_query_results::<_, super::queries::$query<'_>>(
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self,
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encoder,
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query_result_index
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)?;
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)*
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}
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}
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rustc_cached_queries!(encode_queries!);
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Ok(())
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}
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pub fn try_print_query_stack(
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self,
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query: Option<QueryJobId<DepKind>>,
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handler: &Handler,
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num_frames: Option<usize>,
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) -> usize {
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rustc_query_system::query::print_query_stack(self, query, handler, num_frames)
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}
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}
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/// This struct stores metadata about each Query.
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///
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/// Information is retrieved by indexing the `QUERIES` array using the integer value
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/// of the `DepKind`. Overall, this allows to implement `QueryContext` using this manual
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/// jump table instead of large matches.
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pub struct QueryStruct {
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/// The red/green evaluation system will try to mark a specific DepNode in the
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/// dependency graph as green by recursively trying to mark the dependencies of
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/// that `DepNode` as green. While doing so, it will sometimes encounter a `DepNode`
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/// where we don't know if it is red or green and we therefore actually have
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/// to recompute its value in order to find out. Since the only piece of
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/// information that we have at that point is the `DepNode` we are trying to
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/// re-evaluate, we need some way to re-run a query from just that. This is what
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/// `force_from_dep_node()` implements.
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///
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/// In the general case, a `DepNode` consists of a `DepKind` and an opaque
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/// GUID/fingerprint that will uniquely identify the node. This GUID/fingerprint
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/// is usually constructed by computing a stable hash of the query-key that the
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/// `DepNode` corresponds to. Consequently, it is not in general possible to go
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/// back from hash to query-key (since hash functions are not reversible). For
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/// this reason `force_from_dep_node()` is expected to fail from time to time
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/// because we just cannot find out, from the `DepNode` alone, what the
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/// corresponding query-key is and therefore cannot re-run the query.
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///
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/// The system deals with this case letting `try_mark_green` fail which forces
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/// the root query to be re-evaluated.
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///
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/// Now, if `force_from_dep_node()` would always fail, it would be pretty useless.
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/// Fortunately, we can use some contextual information that will allow us to
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/// reconstruct query-keys for certain kinds of `DepNode`s. In particular, we
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/// enforce by construction that the GUID/fingerprint of certain `DepNode`s is a
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/// valid `DefPathHash`. Since we also always build a huge table that maps every
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/// `DefPathHash` in the current codebase to the corresponding `DefId`, we have
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/// everything we need to re-run the query.
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///
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/// Take the `mir_promoted` query as an example. Like many other queries, it
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/// just has a single parameter: the `DefId` of the item it will compute the
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/// validated MIR for. Now, when we call `force_from_dep_node()` on a `DepNode`
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/// with kind `MirValidated`, we know that the GUID/fingerprint of the `DepNode`
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/// is actually a `DefPathHash`, and can therefore just look up the corresponding
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/// `DefId` in `tcx.def_path_hash_to_def_id`.
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///
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/// When you implement a new query, it will likely have a corresponding new
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/// `DepKind`, and you'll have to support it here in `force_from_dep_node()`. As
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/// a rule of thumb, if your query takes a `DefId` or `LocalDefId` as sole parameter,
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/// then `force_from_dep_node()` should not fail for it. Otherwise, you can just
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/// add it to the "We don't have enough information to reconstruct..." group in
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/// the match below.
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pub(crate) force_from_dep_node: fn(tcx: QueryCtxt<'_>, dep_node: &DepNode) -> bool,
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/// Invoke a query to put the on-disk cached value in memory.
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pub(crate) try_load_from_on_disk_cache: fn(QueryCtxt<'_>, &DepNode),
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}
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macro_rules! handle_cycle_error {
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([][$tcx: expr, $error:expr]) => {{
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$error.emit();
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Value::from_cycle_error($tcx)
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}};
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([fatal_cycle $($rest:tt)*][$tcx:expr, $error:expr]) => {{
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$error.emit();
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$tcx.sess.abort_if_errors();
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unreachable!()
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}};
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([cycle_delay_bug $($rest:tt)*][$tcx:expr, $error:expr]) => {{
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$error.delay_as_bug();
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Value::from_cycle_error($tcx)
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}};
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([$other:ident $(($($other_args:tt)*))* $(, $($modifiers:tt)*)*][$($args:tt)*]) => {
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handle_cycle_error!([$($($modifiers)*)*][$($args)*])
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};
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}
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macro_rules! is_anon {
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([]) => {{
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false
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}};
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([anon $($rest:tt)*]) => {{
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true
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}};
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([$other:ident $(($($other_args:tt)*))* $(, $($modifiers:tt)*)*]) => {
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is_anon!([$($($modifiers)*)*])
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};
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}
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macro_rules! is_eval_always {
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([]) => {{
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false
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}};
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([eval_always $($rest:tt)*]) => {{
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true
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}};
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([$other:ident $(($($other_args:tt)*))* $(, $($modifiers:tt)*)*]) => {
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is_eval_always!([$($($modifiers)*)*])
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};
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}
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macro_rules! hash_result {
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([][$hcx:expr, $result:expr]) => {{
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dep_graph::hash_result($hcx, &$result)
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}};
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([no_hash $($rest:tt)*][$hcx:expr, $result:expr]) => {{
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None
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}};
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([$other:ident $(($($other_args:tt)*))* $(, $($modifiers:tt)*)*][$($args:tt)*]) => {
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hash_result!([$($($modifiers)*)*][$($args)*])
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};
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}
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macro_rules! define_queries {
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(<$tcx:tt>
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$($(#[$attr:meta])*
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[$($modifiers:tt)*] fn $name:ident($($K:tt)*) -> $V:ty,)*) => {
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define_queries_struct! {
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tcx: $tcx,
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input: ($(([$($modifiers)*] [$($attr)*] [$name]))*)
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}
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mod make_query {
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use super::*;
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// Create an eponymous constructor for each query.
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$(#[allow(nonstandard_style)] $(#[$attr])*
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pub fn $name<$tcx>(tcx: QueryCtxt<$tcx>, key: query_keys::$name<$tcx>) -> QueryStackFrame {
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let kind = dep_graph::DepKind::$name;
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let name = stringify!($name);
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// Disable visible paths printing for performance reasons.
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// Showing visible path instead of any path is not that important in production.
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let description = ty::print::with_no_visible_paths(
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|| ty::print::with_forced_impl_filename_line(
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// Force filename-line mode to avoid invoking `type_of` query.
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|| queries::$name::describe(tcx, key)
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));
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let description = if tcx.sess.verbose() {
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format!("{} [{}]", description, name)
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} else {
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description
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};
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let span = if kind == dep_graph::DepKind::def_span {
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// The `def_span` query is used to calculate `default_span`,
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// so exit to avoid infinite recursion.
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None
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} else {
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Some(key.default_span(*tcx))
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};
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let def_id = key.key_as_def_id();
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let def_kind = def_id
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.and_then(|def_id| def_id.as_local())
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// Use `tcx.hir().opt_def_kind()` to reduce the chance of
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// accidentally triggering an infinite query loop.
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.and_then(|def_id| tcx.hir().opt_def_kind(def_id))
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.map(|def_kind| $crate::util::def_kind_to_simple_def_kind(def_kind));
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let hash = || {
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let mut hcx = tcx.create_stable_hashing_context();
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let mut hasher = StableHasher::new();
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std::mem::discriminant(&kind).hash_stable(&mut hcx, &mut hasher);
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key.hash_stable(&mut hcx, &mut hasher);
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hasher.finish::<u64>()
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};
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QueryStackFrame::new(name, description, span, def_kind, hash)
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})*
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}
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#[allow(nonstandard_style)]
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pub mod queries {
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use std::marker::PhantomData;
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$(pub struct $name<$tcx> {
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data: PhantomData<&$tcx ()>
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})*
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}
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$(impl<$tcx> QueryConfig for queries::$name<$tcx> {
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type Key = query_keys::$name<$tcx>;
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type Value = query_values::$name<$tcx>;
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type Stored = query_stored::$name<$tcx>;
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const NAME: &'static str = stringify!($name);
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}
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impl<$tcx> QueryAccessors<QueryCtxt<$tcx>> for queries::$name<$tcx> {
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const ANON: bool = is_anon!([$($modifiers)*]);
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const EVAL_ALWAYS: bool = is_eval_always!([$($modifiers)*]);
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const DEP_KIND: dep_graph::DepKind = dep_graph::DepKind::$name;
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type Cache = query_storage::$name<$tcx>;
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#[inline(always)]
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fn query_state<'a>(tcx: QueryCtxt<$tcx>) -> &'a QueryState<crate::dep_graph::DepKind, Self::Key>
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where QueryCtxt<$tcx>: 'a
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{
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&tcx.queries.$name
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}
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#[inline(always)]
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fn query_cache<'a>(tcx: QueryCtxt<$tcx>) -> &'a QueryCacheStore<Self::Cache>
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where 'tcx:'a
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{
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&tcx.query_caches.$name
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}
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#[inline]
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fn compute_fn(tcx: QueryCtxt<'tcx>, key: &Self::Key) ->
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fn(TyCtxt<'tcx>, Self::Key) -> Self::Value
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{
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if key.query_crate_is_local() {
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tcx.queries.local_providers.$name
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} else {
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tcx.queries.extern_providers.$name
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}
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}
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fn hash_result(
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_hcx: &mut StableHashingContext<'_>,
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_result: &Self::Value
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) -> Option<Fingerprint> {
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hash_result!([$($modifiers)*][_hcx, _result])
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}
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fn handle_cycle_error(
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tcx: QueryCtxt<'tcx>,
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mut error: DiagnosticBuilder<'_>,
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) -> Self::Value {
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handle_cycle_error!([$($modifiers)*][tcx, error])
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}
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})*
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#[allow(non_upper_case_globals)]
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pub mod query_callbacks {
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use super::*;
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use rustc_middle::dep_graph::DepNode;
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use rustc_middle::ty::query::query_keys;
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use rustc_query_system::dep_graph::DepNodeParams;
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use rustc_query_system::query::{force_query, QueryDescription};
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// We use this for most things when incr. comp. is turned off.
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pub const Null: QueryStruct = QueryStruct {
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force_from_dep_node: |_, dep_node| bug!("force_from_dep_node: encountered {:?}", dep_node),
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try_load_from_on_disk_cache: |_, _| {},
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};
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pub const TraitSelect: QueryStruct = QueryStruct {
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force_from_dep_node: |_, _| false,
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try_load_from_on_disk_cache: |_, _| {},
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};
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pub const CompileCodegenUnit: QueryStruct = QueryStruct {
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force_from_dep_node: |_, _| false,
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try_load_from_on_disk_cache: |_, _| {},
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};
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pub const CompileMonoItem: QueryStruct = QueryStruct {
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force_from_dep_node: |_, _| false,
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try_load_from_on_disk_cache: |_, _| {},
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};
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$(pub const $name: QueryStruct = {
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const is_anon: bool = is_anon!([$($modifiers)*]);
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#[inline(always)]
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fn can_reconstruct_query_key() -> bool {
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<query_keys::$name<'_> as DepNodeParams<TyCtxt<'_>>>
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::can_reconstruct_query_key()
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}
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fn recover<'tcx>(tcx: TyCtxt<'tcx>, dep_node: &DepNode) -> Option<query_keys::$name<'tcx>> {
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<query_keys::$name<'_> as DepNodeParams<TyCtxt<'_>>>::recover(tcx, dep_node)
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}
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fn force_from_dep_node(tcx: QueryCtxt<'_>, dep_node: &DepNode) -> bool {
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force_query::<queries::$name<'_>, _>(tcx, dep_node)
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}
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fn try_load_from_on_disk_cache(tcx: QueryCtxt<'_>, dep_node: &DepNode) {
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if is_anon {
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return
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}
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if !can_reconstruct_query_key() {
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return
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}
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debug_assert!(tcx.dep_graph.is_green(dep_node));
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let key = recover(*tcx, dep_node).unwrap_or_else(|| panic!("Failed to recover key for {:?} with hash {}", dep_node, dep_node.hash));
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if queries::$name::cache_on_disk(tcx, &key, None) {
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let _ = tcx.$name(key);
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}
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}
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QueryStruct {
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force_from_dep_node,
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try_load_from_on_disk_cache,
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}
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};)*
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}
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static QUERY_CALLBACKS: &[QueryStruct] = &make_dep_kind_array!(query_callbacks);
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}
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}
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// FIXME(eddyb) this macro (and others?) use `$tcx` and `'tcx` interchangeably.
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// We should either not take `$tcx` at all and use `'tcx` everywhere, or use
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// `$tcx` everywhere (even if that isn't necessary due to lack of hygiene).
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macro_rules! define_queries_struct {
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(tcx: $tcx:tt,
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input: ($(([$($modifiers:tt)*] [$($attr:tt)*] [$name:ident]))*)) => {
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pub struct Queries<$tcx> {
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local_providers: Box<Providers>,
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extern_providers: Box<Providers>,
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pub on_disk_cache: Option<OnDiskCache<$tcx>>,
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$($(#[$attr])* $name: QueryState<
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crate::dep_graph::DepKind,
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query_keys::$name<$tcx>,
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>,)*
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}
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impl<$tcx> Queries<$tcx> {
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pub fn new(
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local_providers: Providers,
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extern_providers: Providers,
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on_disk_cache: Option<OnDiskCache<$tcx>>,
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) -> Self {
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Queries {
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local_providers: Box::new(local_providers),
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extern_providers: Box::new(extern_providers),
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on_disk_cache,
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$($name: Default::default()),*
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}
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}
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pub(crate) fn try_collect_active_jobs(
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&$tcx self,
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tcx: TyCtxt<$tcx>,
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) -> Option<QueryMap<crate::dep_graph::DepKind>> {
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let tcx = QueryCtxt { tcx, queries: self };
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let mut jobs = QueryMap::default();
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$(
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self.$name.try_collect_active_jobs(
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tcx,
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dep_graph::DepKind::$name,
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make_query::$name,
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&mut jobs,
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)?;
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)*
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Some(jobs)
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}
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}
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impl QueryEngine<'tcx> for Queries<'tcx> {
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fn as_any(&'tcx self) -> &'tcx dyn std::any::Any {
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let this = unsafe { std::mem::transmute::<&Queries<'_>, &Queries<'_>>(self) };
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this as _
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}
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fn try_mark_green(&'tcx self, tcx: TyCtxt<'tcx>, dep_node: &dep_graph::DepNode) -> bool {
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let qcx = QueryCtxt { tcx, queries: self };
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tcx.dep_graph.try_mark_green(qcx, dep_node).is_some()
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}
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$($(#[$attr])*
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#[inline(always)]
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fn $name(
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&'tcx self,
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tcx: TyCtxt<$tcx>,
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span: Span,
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key: query_keys::$name<$tcx>,
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lookup: QueryLookup,
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mode: QueryMode,
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) -> Option<query_stored::$name<$tcx>> {
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let qcx = QueryCtxt { tcx, queries: self };
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get_query::<queries::$name<$tcx>, _>(qcx, span, key, lookup, mode)
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})*
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}
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};
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}
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fn describe_as_module(def_id: LocalDefId, tcx: TyCtxt<'_>) -> String {
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|
if def_id.is_top_level_module() {
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"top-level module".to_string()
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} else {
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format!("module `{}`", tcx.def_path_str(def_id.to_def_id()))
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}
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}
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rustc_query_description! {}
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