Auto merge of #131259 - ismailarilik:handle-potential-query-instability-lint-for-librustdoc, r=notriddle

Handle `librustdoc` cases of `rustc::potential_query_instability` lint

This PR removes `#![allow(rustc::potential_query_instability)]` line from [`src/librustdoc/lib.rs`](https://github.com/rust-lang/rust/blob/master/src/librustdoc/lib.rs#L23) and converts `FxHash{Map,Set}` types into `FxIndex{Map,Set}` to suppress lint errors.

A somewhat tracking issue: #84447

r? `@compiler-errors`

Author: bors

compiler/rustc_resolve/src/rustdoc.rs

@@ -6,7 +6,7 @@ use pulldown_cmark::{
 };
 use rustc_ast as ast;
 use rustc_ast::util::comments::beautify_doc_string;
-use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::fx::FxIndexMap;
 use rustc_middle::ty::TyCtxt;
 use rustc_span::def_id::DefId;
 use rustc_span::symbol::{Symbol, kw, sym};
@@ -235,8 +235,8 @@ fn span_for_value(attr: &ast::Attribute) -> Span {
 /// early and late doc link resolution regardless of their position.
 pub fn prepare_to_doc_link_resolution(
     doc_fragments: &[DocFragment],
-) -> FxHashMap<Option<DefId>, String> {
-    let mut res = FxHashMap::default();
+) -> FxIndexMap<Option<DefId>, String> {
+    let mut res = FxIndexMap::default();
     for fragment in doc_fragments {
         let out_str = res.entry(fragment.item_id).or_default();
         add_doc_fragment(out_str, fragment);

src/librustdoc/clean/types.rs

@@ -9,7 +9,7 @@ use rustc_ast::NestedMetaItem;
 use rustc_ast_pretty::pprust;
 use rustc_attr::{ConstStability, Deprecation, Stability, StableSince};
 use rustc_const_eval::const_eval::is_unstable_const_fn;
-use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_data_structures::fx::{FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_hir::def::{CtorKind, DefKind, Res};
 use rustc_hir::def_id::{CrateNum, DefId, LOCAL_CRATE, LocalDefId};
 use rustc_hir::lang_items::LangItem;
@@ -114,7 +114,7 @@ impl From<DefId> for ItemId {
 pub(crate) struct Crate {
     pub(crate) module: Item,
     /// Only here so that they can be filtered through the rustdoc passes.
-    pub(crate) external_traits: Box<FxHashMap<DefId, Trait>>,
+    pub(crate) external_traits: Box<FxIndexMap<DefId, Trait>>,
 }
 
 impl Crate {
@@ -1223,7 +1223,7 @@ impl Attributes {
     }
 
     pub(crate) fn get_doc_aliases(&self) -> Box<[Symbol]> {
-        let mut aliases = FxHashSet::default();
+        let mut aliases = FxIndexSet::default();
 
         for attr in self.other_attrs.lists(sym::doc).filter(|a| a.has_name(sym::alias)) {
             if let Some(values) = attr.meta_item_list() {
@@ -1759,7 +1759,7 @@ pub(crate) enum PrimitiveType {
     Never,
 }
 
-type SimplifiedTypes = FxHashMap<PrimitiveType, ArrayVec<SimplifiedType, 3>>;
+type SimplifiedTypes = FxIndexMap<PrimitiveType, ArrayVec<SimplifiedType, 3>>;
 impl PrimitiveType {
     pub(crate) fn from_hir(prim: hir::PrimTy) -> PrimitiveType {
         use ast::{FloatTy, IntTy, UintTy};
@@ -1927,10 +1927,10 @@ impl PrimitiveType {
     /// In particular, if a crate depends on both `std` and another crate that also defines
     /// `rustc_doc_primitive`, then it's entirely random whether `std` or the other crate is picked.
     /// (no_std crates are usually fine unless multiple dependencies define a primitive.)
-    pub(crate) fn primitive_locations(tcx: TyCtxt<'_>) -> &FxHashMap<PrimitiveType, DefId> {
-        static PRIMITIVE_LOCATIONS: OnceCell<FxHashMap<PrimitiveType, DefId>> = OnceCell::new();
+    pub(crate) fn primitive_locations(tcx: TyCtxt<'_>) -> &FxIndexMap<PrimitiveType, DefId> {
+        static PRIMITIVE_LOCATIONS: OnceCell<FxIndexMap<PrimitiveType, DefId>> = OnceCell::new();
         PRIMITIVE_LOCATIONS.get_or_init(|| {
-            let mut primitive_locations = FxHashMap::default();
+            let mut primitive_locations = FxIndexMap::default();
             // NOTE: technically this misses crates that are only passed with `--extern` and not loaded when checking the crate.
             // This is a degenerate case that I don't plan to support.
             for &crate_num in tcx.crates(()) {
@@ -2460,7 +2460,7 @@ pub(crate) struct Impl {
 }
 
 impl Impl {
-    pub(crate) fn provided_trait_methods(&self, tcx: TyCtxt<'_>) -> FxHashSet<Symbol> {
+    pub(crate) fn provided_trait_methods(&self, tcx: TyCtxt<'_>) -> FxIndexSet<Symbol> {
         self.trait_
             .as_ref()
             .map(|t| t.def_id())

src/librustdoc/config.rs

@@ -5,7 +5,7 @@ use std::path::{Path, PathBuf};
 use std::str::FromStr;
 use std::{fmt, io};
 
-use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::fx::FxIndexMap;
 use rustc_errors::DiagCtxtHandle;
 use rustc_session::config::{
     self, CodegenOptions, CrateType, ErrorOutputType, Externs, Input, JsonUnusedExterns,
@@ -249,7 +249,7 @@ pub(crate) struct RenderOptions {
     pub(crate) extern_html_root_takes_precedence: bool,
     /// A map of the default settings (values are as for DOM storage API). Keys should lack the
     /// `rustdoc-` prefix.
-    pub(crate) default_settings: FxHashMap<String, String>,
+    pub(crate) default_settings: FxIndexMap<String, String>,
     /// If present, suffix added to CSS/JavaScript files when referencing them in generated pages.
     pub(crate) resource_suffix: String,
     /// Whether to create an index page in the root of the output directory. If this is true but

src/librustdoc/core.rs

@@ -2,7 +2,7 @@ use std::sync::atomic::AtomicBool;
 use std::sync::{Arc, LazyLock};
 use std::{io, mem};
 
-use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap};
 use rustc_data_structures::sync::Lrc;
 use rustc_data_structures::unord::UnordSet;
 use rustc_errors::codes::*;
@@ -39,7 +39,7 @@ pub(crate) struct DocContext<'tcx> {
     /// Most of this logic is copied from rustc_lint::late.
     pub(crate) param_env: ParamEnv<'tcx>,
     /// Later on moved through `clean::Crate` into `cache`
-    pub(crate) external_traits: FxHashMap<DefId, clean::Trait>,
+    pub(crate) external_traits: FxIndexMap<DefId, clean::Trait>,
     /// Used while populating `external_traits` to ensure we don't process the same trait twice at
     /// the same time.
     pub(crate) active_extern_traits: DefIdSet,

src/librustdoc/doctest.rs

@@ -14,7 +14,7 @@ use std::{panic, str};
 pub(crate) use make::DocTestBuilder;
 pub(crate) use markdown::test as test_markdown;
 use rustc_ast as ast;
-use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_data_structures::fx::{FxHashMap, FxIndexMap, FxIndexSet};
 use rustc_errors::{ColorConfig, DiagCtxtHandle, ErrorGuaranteed, FatalError};
 use rustc_hir::CRATE_HIR_ID;
 use rustc_hir::def_id::LOCAL_CRATE;
@@ -213,12 +213,13 @@ pub(crate) fn run(
         let unused_extern_reports: Vec<_> =
             std::mem::take(&mut unused_extern_reports.lock().unwrap());
         if unused_extern_reports.len() == compiling_test_count {
-            let extern_names = externs.iter().map(|(name, _)| name).collect::<FxHashSet<&String>>();
+            let extern_names =
+                externs.iter().map(|(name, _)| name).collect::<FxIndexSet<&String>>();
             let mut unused_extern_names = unused_extern_reports
                 .iter()
-                .map(|uexts| uexts.unused_extern_names.iter().collect::<FxHashSet<&String>>())
+                .map(|uexts| uexts.unused_extern_names.iter().collect::<FxIndexSet<&String>>())
                 .fold(extern_names, |uextsa, uextsb| {
-                    uextsa.intersection(&uextsb).copied().collect::<FxHashSet<&String>>()
+                    uextsa.intersection(&uextsb).copied().collect::<FxIndexSet<&String>>()
                 })
                 .iter()
                 .map(|v| (*v).clone())
@@ -253,7 +254,7 @@ pub(crate) fn run_tests(
     rustdoc_options: &Arc<RustdocOptions>,
     unused_extern_reports: &Arc<Mutex<Vec<UnusedExterns>>>,
     mut standalone_tests: Vec<test::TestDescAndFn>,
-    mergeable_tests: FxHashMap<Edition, Vec<(DocTestBuilder, ScrapedDocTest)>>,
+    mergeable_tests: FxIndexMap<Edition, Vec<(DocTestBuilder, ScrapedDocTest)>>,
 ) {
     let mut test_args = Vec::with_capacity(rustdoc_options.test_args.len() + 1);
     test_args.insert(0, "rustdoctest".to_string());
@@ -775,7 +776,7 @@ pub(crate) trait DocTestVisitor {
 
 struct CreateRunnableDocTests {
     standalone_tests: Vec<test::TestDescAndFn>,
-    mergeable_tests: FxHashMap<Edition, Vec<(DocTestBuilder, ScrapedDocTest)>>,
+    mergeable_tests: FxIndexMap<Edition, Vec<(DocTestBuilder, ScrapedDocTest)>>,
 
     rustdoc_options: Arc<RustdocOptions>,
     opts: GlobalTestOptions,
@@ -790,7 +791,7 @@ impl CreateRunnableDocTests {
         let can_merge_doctests = rustdoc_options.edition >= Edition::Edition2024;
         CreateRunnableDocTests {
             standalone_tests: Vec::new(),
-            mergeable_tests: FxHashMap::default(),
+            mergeable_tests: FxIndexMap::default(),
             rustdoc_options: Arc::new(rustdoc_options),
             opts,
             visited_tests: FxHashMap::default(),

src/librustdoc/doctest/runner.rs

@@ -1,6 +1,6 @@
 use std::fmt::Write;
 
-use rustc_data_structures::fx::FxHashSet;
+use rustc_data_structures::fx::FxIndexSet;
 use rustc_span::edition::Edition;
 
 use crate::doctest::{
@@ -11,7 +11,7 @@ use crate::html::markdown::{Ignore, LangString};
 
 /// Convenient type to merge compatible doctests into one.
 pub(crate) struct DocTestRunner {
-    crate_attrs: FxHashSet<String>,
+    crate_attrs: FxIndexSet<String>,
     ids: String,
     output: String,
     supports_color: bool,
@@ -21,7 +21,7 @@ pub(crate) struct DocTestRunner {
 impl DocTestRunner {
     pub(crate) fn new() -> Self {
         Self {
-            crate_attrs: FxHashSet::default(),
+            crate_attrs: FxIndexSet::default(),
             ids: String::new(),
             output: String::new(),
             supports_color: true,

src/librustdoc/formats/cache.rs

@@ -1,6 +1,6 @@
 use std::mem;
 
-use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexSet};
+use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, DefIdSet};
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_span::Symbol;
@@ -42,7 +42,7 @@ pub(crate) struct Cache {
     /// URLs when a type is being linked to. External paths are not located in
     /// this map because the `External` type itself has all the information
     /// necessary.
-    pub(crate) paths: FxHashMap<DefId, (Vec<Symbol>, ItemType)>,
+    pub(crate) paths: FxIndexMap<DefId, (Vec<Symbol>, ItemType)>,
 
     /// Similar to `paths`, but only holds external paths. This is only used for
     /// generating explicit hyperlinks to other crates.
@@ -64,18 +64,18 @@ pub(crate) struct Cache {
     /// Implementations of a crate should inherit the documentation of the
     /// parent trait if no extra documentation is specified, and default methods
     /// should show up in documentation about trait implementations.
-    pub(crate) traits: FxHashMap<DefId, clean::Trait>,
+    pub(crate) traits: FxIndexMap<DefId, clean::Trait>,
 
     /// When rendering traits, it's often useful to be able to list all
     /// implementors of the trait, and this mapping is exactly, that: a mapping
     /// of trait ids to the list of known implementors of the trait
-    pub(crate) implementors: FxHashMap<DefId, Vec<Impl>>,
+    pub(crate) implementors: FxIndexMap<DefId, Vec<Impl>>,
 
     /// Cache of where external crate documentation can be found.
-    pub(crate) extern_locations: FxHashMap<CrateNum, ExternalLocation>,
+    pub(crate) extern_locations: FxIndexMap<CrateNum, ExternalLocation>,
 
     /// Cache of where documentation for primitives can be found.
-    pub(crate) primitive_locations: FxHashMap<clean::PrimitiveType, DefId>,
+    pub(crate) primitive_locations: FxIndexMap<clean::PrimitiveType, DefId>,
 
     // Note that external items for which `doc(hidden)` applies to are shown as
     // non-reachable while local items aren't. This is because we're reusing
@@ -118,7 +118,7 @@ pub(crate) struct Cache {
     // crawl. In order to prevent crashes when looking for notable traits or
     // when gathering trait documentation on a type, hold impls here while
     // folding and add them to the cache later on if we find the trait.
-    orphan_trait_impls: Vec<(DefId, FxHashSet<DefId>, Impl)>,
+    orphan_trait_impls: Vec<(DefId, FxIndexSet<DefId>, Impl)>,
 
     /// All intra-doc links resolved so far.
     ///
@@ -376,7 +376,7 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
             // Figure out the id of this impl. This may map to a
             // primitive rather than always to a struct/enum.
             // Note: matching twice to restrict the lifetime of the `i` borrow.
-            let mut dids = FxHashSet::default();
+            let mut dids = FxIndexSet::default();
             match i.for_ {
                 clean::Type::Path { ref path }
                 | clean::BorrowedRef { type_: box clean::Type::Path { ref path }, .. } => {

src/librustdoc/html/highlight.rs

@@ -8,7 +8,7 @@
 use std::collections::VecDeque;
 use std::fmt::{Display, Write};
 
-use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::fx::FxIndexMap;
 use rustc_lexer::{Cursor, LiteralKind, TokenKind};
 use rustc_span::edition::Edition;
 use rustc_span::symbol::Symbol;
@@ -34,7 +34,7 @@ pub(crate) struct HrefContext<'a, 'tcx> {
 /// Decorations are represented as a map from CSS class to vector of character ranges.
 /// Each range will be wrapped in a span with that class.
 #[derive(Default)]
-pub(crate) struct DecorationInfo(pub(crate) FxHashMap<&'static str, Vec<(u32, u32)>>);
+pub(crate) struct DecorationInfo(pub(crate) FxIndexMap<&'static str, Vec<(u32, u32)>>);
 
 #[derive(Eq, PartialEq, Clone, Copy)]
 pub(crate) enum Tooltip {

src/librustdoc/html/highlight/tests.rs

@@ -1,5 +1,5 @@
 use expect_test::expect_file;
-use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::fx::FxIndexMap;
 use rustc_span::create_default_session_globals_then;
 
 use super::{DecorationInfo, write_code};
@@ -73,7 +73,7 @@ fn test_decorations() {
 let y = 2;
 let z = 3;
 let a = 4;";
-        let mut decorations = FxHashMap::default();
+        let mut decorations = FxIndexMap::default();
         decorations.insert("example", vec![(0, 10), (11, 21)]);
         decorations.insert("example2", vec![(22, 32)]);
 

src/librustdoc/html/layout.rs

@@ -1,7 +1,7 @@
 use std::path::PathBuf;
 
 use rinja::Template;
-use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::fx::FxIndexMap;
 
 use super::static_files::{STATIC_FILES, StaticFiles};
 use crate::externalfiles::ExternalHtml;
@@ -13,7 +13,7 @@ pub(crate) struct Layout {
     pub(crate) logo: String,
     pub(crate) favicon: String,
     pub(crate) external_html: ExternalHtml,
-    pub(crate) default_settings: FxHashMap<String, String>,
+    pub(crate) default_settings: FxIndexMap<String, String>,
     pub(crate) krate: String,
     pub(crate) krate_version: String,
     /// The given user css file which allow to customize the generated