From decfb4d123651a0673db47542e18ca60d1c501ac Mon Sep 17 00:00:00 2001 From: Oli Scherer Date: Tue, 21 Feb 2023 08:37:10 +0000 Subject: [PATCH] Use a lock-free datastructure for `source_span` --- Cargo.lock | 10 +++++ compiler/rustc_data_structures/Cargo.toml | 1 + compiler/rustc_data_structures/src/sync.rs | 4 ++ .../rustc_data_structures/src/sync/vec.rs | 41 +++++++++++++++++++ compiler/rustc_interface/src/queries.rs | 6 +-- compiler/rustc_middle/src/ty/context.rs | 5 +-- compiler/rustc_query_system/src/ich/hcx.rs | 2 +- compiler/rustc_resolve/src/lib.rs | 2 +- compiler/rustc_session/src/cstore.rs | 5 +-- src/tools/tidy/src/deps.rs | 1 + 10 files changed, 65 insertions(+), 12 deletions(-) create mode 100644 compiler/rustc_data_structures/src/sync/vec.rs diff --git a/Cargo.lock b/Cargo.lock index 6c17edd30208..93f8eda66bb8 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -1378,6 +1378,15 @@ dependencies = [ "zeroize", ] +[[package]] +name = "elsa" +version = "1.8.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "f74077c3c3aedb99a2683919698285596662518ea13e5eedcf8bdd43b0d0453b" +dependencies = [ + "stable_deref_trait", +] + [[package]] name = "ena" version = "0.14.0" @@ -3882,6 +3891,7 @@ dependencies = [ "arrayvec 0.7.0", "bitflags", "cfg-if", + "elsa", "ena", "indexmap", "jobserver", diff --git a/compiler/rustc_data_structures/Cargo.toml b/compiler/rustc_data_structures/Cargo.toml index 0366fb0a148c..a6601fbf43bd 100644 --- a/compiler/rustc_data_structures/Cargo.toml +++ b/compiler/rustc_data_structures/Cargo.toml @@ -31,6 +31,7 @@ stacker = "0.1.15" tempfile = "3.2" thin-vec = "0.2.9" tracing = "0.1" +elsa = "1.8" [dependencies.parking_lot] version = "0.11" diff --git a/compiler/rustc_data_structures/src/sync.rs b/compiler/rustc_data_structures/src/sync.rs index ad71dcdf9d95..31323c21df00 100644 --- a/compiler/rustc_data_structures/src/sync.rs +++ b/compiler/rustc_data_structures/src/sync.rs @@ -26,6 +26,10 @@ use std::panic::{catch_unwind, resume_unwind, AssertUnwindSafe}; pub use std::sync::atomic::Ordering; pub use std::sync::atomic::Ordering::SeqCst; +pub use vec::AppendOnlyVec; + +mod vec; + cfg_if! { if #[cfg(not(parallel_compiler))] { pub auto trait Send {} diff --git a/compiler/rustc_data_structures/src/sync/vec.rs b/compiler/rustc_data_structures/src/sync/vec.rs new file mode 100644 index 000000000000..cbea4f059992 --- /dev/null +++ b/compiler/rustc_data_structures/src/sync/vec.rs @@ -0,0 +1,41 @@ +use std::marker::PhantomData; + +use rustc_index::vec::Idx; + +pub struct AppendOnlyVec { + #[cfg(not(parallel_compiler))] + vec: elsa::vec::FrozenVec, + #[cfg(parallel_compiler)] + vec: elsa::sync::LockFreeFrozenVec, + _marker: PhantomData, +} + +impl AppendOnlyVec { + pub fn new() -> Self { + Self { + #[cfg(not(parallel_compiler))] + vec: elsa::vec::FrozenVec::new(), + #[cfg(parallel_compiler)] + vec: elsa::sync::LockFreeFrozenVec::new(), + _marker: PhantomData, + } + } + + pub fn push(&self, val: T) -> I { + #[cfg(not(parallel_compiler))] + let i = self.vec.len(); + #[cfg(not(parallel_compiler))] + self.vec.push(val); + #[cfg(parallel_compiler)] + let i = self.vec.push(val); + I::new(i) + } + + pub fn get(&self, i: I) -> Option { + let i = i.index(); + #[cfg(not(parallel_compiler))] + return self.vec.get_copy(i); + #[cfg(parallel_compiler)] + return self.vec.get(i); + } +} diff --git a/compiler/rustc_interface/src/queries.rs b/compiler/rustc_interface/src/queries.rs index c957578b59e1..a96cc95a3844 100644 --- a/compiler/rustc_interface/src/queries.rs +++ b/compiler/rustc_interface/src/queries.rs @@ -7,11 +7,10 @@ use rustc_codegen_ssa::traits::CodegenBackend; use rustc_codegen_ssa::CodegenResults; use rustc_data_structures::steal::Steal; use rustc_data_structures::svh::Svh; -use rustc_data_structures::sync::{Lrc, OnceCell, RwLock, WorkerLocal}; +use rustc_data_structures::sync::{AppendOnlyVec, Lrc, OnceCell, RwLock, WorkerLocal}; use rustc_hir::def_id::{CRATE_DEF_ID, LOCAL_CRATE}; use rustc_hir::definitions::Definitions; use rustc_incremental::DepGraphFuture; -use rustc_index::vec::IndexVec; use rustc_lint::LintStore; use rustc_metadata::creader::CStore; use rustc_middle::arena::Arena; @@ -195,10 +194,9 @@ impl<'tcx> Queries<'tcx> { let cstore = RwLock::new(Box::new(CStore::new(sess)) as _); let definitions = RwLock::new(Definitions::new(sess.local_stable_crate_id())); - let mut source_span = IndexVec::default(); + let source_span = AppendOnlyVec::new(); let _id = source_span.push(krate.spans.inner_span); debug_assert_eq!(_id, CRATE_DEF_ID); - let source_span = RwLock::new(source_span); let untracked = Untracked { cstore, source_span, definitions }; let qcx = passes::create_global_ctxt( diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs index cf4836ded474..d95e4b56de07 100644 --- a/compiler/rustc_middle/src/ty/context.rs +++ b/compiler/rustc_middle/src/ty/context.rs @@ -1030,7 +1030,7 @@ impl<'tcx> TyCtxt<'tcx> { /// system if the result is otherwise tracked through queries #[inline] pub fn source_span_untracked(self, def_id: LocalDefId) -> Span { - self.untracked.source_span.read().get(def_id).copied().unwrap_or(DUMMY_SP) + self.untracked.source_span.get(def_id).unwrap_or(DUMMY_SP) } #[inline(always)] @@ -2521,6 +2521,5 @@ pub fn provide(providers: &mut ty::query::Providers) { // We want to check if the panic handler was defined in this crate tcx.lang_items().panic_impl().map_or(false, |did| did.is_local()) }; - providers.source_span = - |tcx, def_id| tcx.untracked.source_span.read().get(def_id).copied().unwrap_or(DUMMY_SP); + providers.source_span = |tcx, def_id| tcx.untracked.source_span.get(def_id).unwrap_or(DUMMY_SP); } diff --git a/compiler/rustc_query_system/src/ich/hcx.rs b/compiler/rustc_query_system/src/ich/hcx.rs index 8db8ee9428bc..5593a15412fb 100644 --- a/compiler/rustc_query_system/src/ich/hcx.rs +++ b/compiler/rustc_query_system/src/ich/hcx.rs @@ -146,7 +146,7 @@ impl<'a> rustc_span::HashStableContext for StableHashingContext<'a> { #[inline] fn def_span(&self, def_id: LocalDefId) -> Span { - *self.untracked.source_span.read().get(def_id).unwrap_or(&DUMMY_SP) + self.untracked.source_span.get(def_id).unwrap_or(DUMMY_SP) } #[inline] diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs index 66034baaa0b6..9fd7edeb5a18 100644 --- a/compiler/rustc_resolve/src/lib.rs +++ b/compiler/rustc_resolve/src/lib.rs @@ -1156,7 +1156,7 @@ impl<'tcx> Resolver<'_, 'tcx> { // A relative span's parent must be an absolute span. debug_assert_eq!(span.data_untracked().parent, None); - let _id = self.tcx.untracked().source_span.write().push(span); + let _id = self.tcx.untracked().source_span.push(span); debug_assert_eq!(_id, def_id); // Some things for which we allocate `LocalDefId`s don't correspond to diff --git a/compiler/rustc_session/src/cstore.rs b/compiler/rustc_session/src/cstore.rs index ff13a0bbf3f5..868ffdf0f1da 100644 --- a/compiler/rustc_session/src/cstore.rs +++ b/compiler/rustc_session/src/cstore.rs @@ -6,10 +6,9 @@ use crate::search_paths::PathKind; use crate::utils::NativeLibKind; use crate::Session; use rustc_ast as ast; -use rustc_data_structures::sync::{self, MetadataRef, RwLock}; +use rustc_data_structures::sync::{self, AppendOnlyVec, MetadataRef, RwLock}; use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, StableCrateId, LOCAL_CRATE}; use rustc_hir::definitions::{DefKey, DefPath, DefPathHash, Definitions}; -use rustc_index::vec::IndexVec; use rustc_span::hygiene::{ExpnHash, ExpnId}; use rustc_span::symbol::Symbol; use rustc_span::Span; @@ -255,6 +254,6 @@ pub type CrateStoreDyn = dyn CrateStore + sync::Sync + sync::Send; pub struct Untracked { pub cstore: RwLock>, /// Reference span for definitions. - pub source_span: RwLock>, + pub source_span: AppendOnlyVec, pub definitions: RwLock, } diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs index 4c93f8a16b67..bddfdcfaf194 100644 --- a/src/tools/tidy/src/deps.rs +++ b/src/tools/tidy/src/deps.rs @@ -120,6 +120,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[ "dissimilar", "dlmalloc", "either", + "elsa", "ena", "expect-test", "fallible-iterator", // dependency of `thorin`