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e7aca89598
Refactor query system to maintain a global job id counter This replaces the per-shard counters with a single global counter, simplifying the JobId struct down to just a u64 and removing the need to pipe a DepKind generic through a bunch of code. The performance implications on non-parallel compilers are likely minimal (this switches to `Cell<u64>` as the backing storage over a `u64`, but the latter was already inside a `RefCell` so it's not really a significance divergence). On parallel compilers, the cost of a single global u64 counter may be more significant: it adds a serialization point in theory. On the other hand, we can imagine changing the counter to have a thread-local component if it becomes worrisome or some similar structure. The new design is sufficiently simpler that it warrants the potential for slight changes down the line if/when we get parallel compilation to be more of a default. A u64 counter, instead of u32 (the old per-shard width), is chosen to avoid possibly overflowing it and causing problems; it is effectively impossible that we would overflow a u64 counter in this context.
65 lines
1.8 KiB
Rust
65 lines
1.8 KiB
Rust
//! Support for serializing the dep-graph and reloading it.
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#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
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#![feature(crate_visibility_modifier)]
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#![feature(nll)]
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#![feature(min_specialization)]
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#![feature(once_cell)]
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#![feature(rustc_attrs)]
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#![recursion_limit = "256"]
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#![cfg_attr(not(bootstrap), allow(rustc::potential_query_instability))]
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#[macro_use]
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extern crate rustc_macros;
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#[macro_use]
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extern crate rustc_middle;
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use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
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use rustc_data_structures::sync::AtomicU64;
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use rustc_middle::arena::Arena;
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use rustc_middle::dep_graph::{self, DepKindStruct, SerializedDepNodeIndex};
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use rustc_middle::ty::query::{query_keys, query_storage, query_stored, query_values};
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use rustc_middle::ty::query::{ExternProviders, Providers, QueryEngine};
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use rustc_middle::ty::{self, TyCtxt};
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use rustc_span::def_id::LocalDefId;
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use rustc_span::Span;
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#[macro_use]
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mod plumbing;
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pub use plumbing::QueryCtxt;
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use rustc_query_system::query::*;
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mod keys;
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use keys::Key;
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mod values;
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use self::values::Value;
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pub use rustc_query_system::query::QueryConfig;
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pub(crate) use rustc_query_system::query::{QueryDescription, QueryVtable};
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mod on_disk_cache;
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pub use on_disk_cache::OnDiskCache;
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mod profiling_support;
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pub use self::profiling_support::alloc_self_profile_query_strings;
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mod util;
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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_append! { [define_queries!][<'tcx>] }
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impl<'tcx> Queries<'tcx> {
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// Force codegen in the dyn-trait transformation in this crate.
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pub fn as_dyn(&'tcx self) -> &'tcx dyn QueryEngine<'tcx> {
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self
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}
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}
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