Auto merge of #136471 - safinaskar:parallel, r=SparrowLii

tree-wide: parallel: Fully removed all `Lrc`, replaced with `Arc`

tree-wide: parallel: Fully removed all `Lrc`, replaced with `Arc`

This is continuation of rust-lang/rust#132282 .

I'm pretty sure I did everything right. In particular, I searched all occurrences of `Lrc` in submodules and made sure that they don't need replacement.

There are other possibilities, through.

We can define `enum Lrc<T> { Rc(Rc<T>), Arc(Arc<T>) }`. Or we can make `Lrc` a union and on every clone we can read from special thread-local variable. Or we can add a generic parameter to `Lrc` and, yes, this parameter will be everywhere across all codebase.

So, if you think we should take some alternative approach, then don't merge this PR. But if it is decided to stick with `Arc`, then, please, merge.

cc "Parallel Rustc Front-end" ( rust-lang/rust#113349 )

r? SparrowLii

`@rustbot` label WG-compiler-parallel

Author: bors

clippy_lints/src/attrs/mixed_attributes_style.rs

@@ -1,8 +1,8 @@
+use std::sync::Arc;
 use super::MIXED_ATTRIBUTES_STYLE;
 use clippy_utils::diagnostics::span_lint;
 use rustc_ast::{AttrKind, AttrStyle, Attribute};
 use rustc_data_structures::fx::FxHashSet;
-use rustc_data_structures::sync::Lrc;
 use rustc_lint::{EarlyContext, LintContext};
 use rustc_span::source_map::SourceMap;
 use rustc_span::{SourceFile, Span, Symbol};
@@ -79,7 +79,7 @@ fn lint_mixed_attrs(cx: &EarlyContext<'_>, attrs: &[Attribute]) {
     );
 }
 
-fn attr_in_same_src_as_item(source_map: &SourceMap, item_src: &Lrc<SourceFile>, attr_span: Span) -> bool {
+fn attr_in_same_src_as_item(source_map: &SourceMap, item_src: &Arc<SourceFile>, attr_span: Span) -> bool {
     let attr_src = source_map.lookup_source_file(attr_span.lo());
-    Lrc::ptr_eq(item_src, &attr_src)
+    Arc::ptr_eq(item_src, &attr_src)
 }

clippy_lints/src/doc/needless_doctest_main.rs

@@ -1,10 +1,10 @@
 use std::ops::Range;
 use std::{io, thread};
+use std::sync::Arc;
 
 use crate::doc::{NEEDLESS_DOCTEST_MAIN, TEST_ATTR_IN_DOCTEST};
 use clippy_utils::diagnostics::span_lint;
 use rustc_ast::{CoroutineKind, Fn, FnRetTy, Item, ItemKind};
-use rustc_data_structures::sync::Lrc;
 use rustc_errors::emitter::HumanEmitter;
 use rustc_errors::{Diag, DiagCtxt};
 use rustc_lint::LateContext;
@@ -46,8 +46,8 @@ pub fn check(
                     rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(), false);
                 let emitter = HumanEmitter::new(Box::new(io::sink()), fallback_bundle);
                 let dcx = DiagCtxt::new(Box::new(emitter)).disable_warnings();
-                #[expect(clippy::arc_with_non_send_sync)] // `Lrc` is expected by with_dcx
-                let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
+                #[expect(clippy::arc_with_non_send_sync)] // `Arc` is expected by with_dcx
+                let sm = Arc::new(SourceMap::new(FilePathMapping::empty()));
                 let psess = ParseSess::with_dcx(dcx, sm);
 
                 let mut parser = match new_parser_from_source_str(&psess, filename, code) {

clippy_lints/src/undocumented_unsafe_blocks.rs

@@ -1,3 +1,4 @@
+use std::sync::Arc;
 use std::ops::ControlFlow;
 
 use clippy_config::Conf;
@@ -6,7 +7,6 @@ use clippy_utils::is_lint_allowed;
 use clippy_utils::source::walk_span_to_context;
 use clippy_utils::visitors::{Descend, for_each_expr};
 use hir::HirId;
-use rustc_data_structures::sync::Lrc;
 use rustc_hir as hir;
 use rustc_hir::{Block, BlockCheckMode, ItemKind, Node, UnsafeSource};
 use rustc_lexer::{TokenKind, tokenize};
@@ -480,7 +480,7 @@ fn item_has_safety_comment(cx: &LateContext<'_>, item: &hir::Item<'_>) -> HasSaf
     if let Some(comment_start) = comment_start
         && let Ok(unsafe_line) = source_map.lookup_line(item.span.lo())
         && let Ok(comment_start_line) = source_map.lookup_line(comment_start)
-        && Lrc::ptr_eq(&unsafe_line.sf, &comment_start_line.sf)
+        && Arc::ptr_eq(&unsafe_line.sf, &comment_start_line.sf)
         && let Some(src) = unsafe_line.sf.src.as_deref()
     {
         return if comment_start_line.line >= unsafe_line.line {
@@ -520,7 +520,7 @@ fn stmt_has_safety_comment(cx: &LateContext<'_>, span: Span, hir_id: HirId) -> H
     if let Some(comment_start) = comment_start
         && let Ok(unsafe_line) = source_map.lookup_line(span.lo())
         && let Ok(comment_start_line) = source_map.lookup_line(comment_start)
-        && Lrc::ptr_eq(&unsafe_line.sf, &comment_start_line.sf)
+        && Arc::ptr_eq(&unsafe_line.sf, &comment_start_line.sf)
         && let Some(src) = unsafe_line.sf.src.as_deref()
     {
         return if comment_start_line.line >= unsafe_line.line {
@@ -580,7 +580,7 @@ fn span_from_macro_expansion_has_safety_comment(cx: &LateContext<'_>, span: Span
         //     ^--------------------------------------------^
         if let Ok(unsafe_line) = source_map.lookup_line(span.lo())
             && let Ok(macro_line) = source_map.lookup_line(ctxt.outer_expn_data().def_site.lo())
-            && Lrc::ptr_eq(&unsafe_line.sf, &macro_line.sf)
+            && Arc::ptr_eq(&unsafe_line.sf, &macro_line.sf)
             && let Some(src) = unsafe_line.sf.src.as_deref()
         {
             if macro_line.line < unsafe_line.line {
@@ -641,7 +641,7 @@ fn span_has_safety_comment(cx: &LateContext<'_>, span: Span) -> bool {
         if let Ok(unsafe_line) = source_map.lookup_line(span.lo())
             && let Some(body_span) = walk_span_to_context(search_span, SyntaxContext::root())
             && let Ok(body_line) = source_map.lookup_line(body_span.lo())
-            && Lrc::ptr_eq(&unsafe_line.sf, &body_line.sf)
+            && Arc::ptr_eq(&unsafe_line.sf, &body_line.sf)
             && let Some(src) = unsafe_line.sf.src.as_deref()
         {
             // Get the text from the start of function body to the unsafe block.

clippy_lints/src/utils/attr_collector.rs

@@ -1,14 +1,13 @@
 use std::mem;
-use std::sync::OnceLock;
+use std::sync::{Arc, OnceLock};
 
 use rustc_ast::{Attribute, Crate};
-use rustc_data_structures::sync::Lrc;
 use rustc_lint::{EarlyContext, EarlyLintPass};
 use rustc_session::impl_lint_pass;
 use rustc_span::Span;
 
 #[derive(Clone, Default)]
-pub struct AttrStorage(pub Lrc<OnceLock<Vec<Span>>>);
+pub struct AttrStorage(pub Arc<OnceLock<Vec<Span>>>);
 
 pub struct AttrCollector {
     storage: AttrStorage,

clippy_utils/src/consts.rs

@@ -4,13 +4,14 @@
 //! executable MIR bodies, so we have to do this instead.
 #![allow(clippy::float_cmp)]
 
+use std::sync::Arc;
+
 use crate::source::{SpanRangeExt, walk_span_to_context};
 use crate::{clip, is_direct_expn_of, sext, unsext};
 
 use rustc_apfloat::Float;
 use rustc_apfloat::ieee::{Half, Quad};
 use rustc_ast::ast::{self, LitFloatType, LitKind};
-use rustc_data_structures::sync::Lrc;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::{
     BinOp, BinOpKind, Block, ConstBlock, Expr, ExprKind, HirId, Item, ItemKind, Node, PatExpr, PatExprKind, QPath, UnOp,
@@ -37,7 +38,7 @@ pub enum Constant<'tcx> {
     /// A `String` (e.g., "abc").
     Str(String),
     /// A binary string (e.g., `b"abc"`).
-    Binary(Lrc<[u8]>),
+    Binary(Arc<[u8]>),
     /// A single `char` (e.g., `'a'`).
     Char(char),
     /// An integer's bit representation.
@@ -305,7 +306,7 @@ pub fn lit_to_mir_constant<'tcx>(lit: &LitKind, ty: Option<Ty<'tcx>>) -> Constan
     match *lit {
         LitKind::Str(ref is, _) => Constant::Str(is.to_string()),
         LitKind::Byte(b) => Constant::Int(u128::from(b)),
-        LitKind::ByteStr(ref s, _) | LitKind::CStr(ref s, _) => Constant::Binary(Lrc::clone(s)),
+        LitKind::ByteStr(ref s, _) | LitKind::CStr(ref s, _) => Constant::Binary(Arc::clone(s)),
         LitKind::Char(c) => Constant::Char(c),
         LitKind::Int(n, _) => Constant::Int(n.get()),
         LitKind::Float(ref is, LitFloatType::Suffixed(fty)) => match fty {

clippy_utils/src/macros.rs

@@ -1,12 +1,14 @@
 #![allow(clippy::similar_names)] // `expr` and `expn`
 
+use std::sync::Arc;
+
 use crate::get_unique_attr;
 use crate::visitors::{Descend, for_each_expr_without_closures};
 
 use arrayvec::ArrayVec;
 use rustc_ast::{FormatArgs, FormatArgument, FormatPlaceholder};
 use rustc_data_structures::fx::FxHashMap;
-use rustc_data_structures::sync::{Lrc, OnceLock};
+use rustc_data_structures::sync::OnceLock;
 use rustc_hir::{self as hir, Expr, ExprKind, HirId, Node, QPath};
 use rustc_lint::{LateContext, LintContext};
 use rustc_span::def_id::DefId;
@@ -393,7 +395,7 @@ fn is_assert_arg(cx: &LateContext<'_>, expr: &Expr<'_>, assert_expn: ExpnId) ->
 /// Stores AST [`FormatArgs`] nodes for use in late lint passes, as they are in a desugared form in
 /// the HIR
 #[derive(Default, Clone)]
-pub struct FormatArgsStorage(Lrc<OnceLock<FxHashMap<Span, FormatArgs>>>);
+pub struct FormatArgsStorage(Arc<OnceLock<FxHashMap<Span, FormatArgs>>>);
 
 impl FormatArgsStorage {
     /// Returns an AST [`FormatArgs`] node if a `format_args` expansion is found as a descendant of

clippy_utils/src/source.rs

@@ -2,8 +2,9 @@
 
 #![allow(clippy::module_name_repetitions)]
 
+use std::sync::Arc;
+
 use rustc_ast::{LitKind, StrStyle};
-use rustc_data_structures::sync::Lrc;
 use rustc_errors::Applicability;
 use rustc_hir::{BlockCheckMode, Expr, ExprKind, UnsafeSource};
 use rustc_lint::{EarlyContext, LateContext};
@@ -204,7 +205,7 @@ impl fmt::Display for SourceText {
 fn get_source_range(sm: &SourceMap, sp: Range<BytePos>) -> Option<SourceFileRange> {
     let start = sm.lookup_byte_offset(sp.start);
     let end = sm.lookup_byte_offset(sp.end);
-    if !Lrc::ptr_eq(&start.sf, &end.sf) || start.pos > end.pos {
+    if !Arc::ptr_eq(&start.sf, &end.sf) || start.pos > end.pos {
         return None;
     }
     sm.ensure_source_file_source_present(&start.sf);
@@ -277,7 +278,7 @@ fn trim_start(sm: &SourceMap, sp: Range<BytePos>) -> Range<BytePos> {
 }
 
 pub struct SourceFileRange {
-    pub sf: Lrc<SourceFile>,
+    pub sf: Arc<SourceFile>,
     pub range: Range<usize>,
 }
 impl SourceFileRange {