Auto merge of rust-lang#118975 - GuillaumeGomez:rollup-0emhjx0, r=GuillaumeGomez

Rollup of 4 pull requests

Successful merges:

 - rust-lang#113091 (Don't merge cfg and doc(cfg) attributes for re-exports)
 - rust-lang#115660 (rustdoc: allow resizing the sidebar / hiding the top bar)
 - rust-lang#118863 (rustc_mir_build: Enforce `rustc::potential_query_instability` lint)
 - rust-lang#118909 (Some cleanup and improvement for invalid ref casting impl)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_lint/src/reference_casting.rs

@@ -37,59 +37,73 @@ declare_lint_pass!(InvalidReferenceCasting => [INVALID_REFERENCE_CASTING]);
 
 impl<'tcx> LateLintPass<'tcx> for InvalidReferenceCasting {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
-        let Some((is_assignment, e)) = is_operation_we_care_about(cx, expr) else {
-            return;
-        };
-
-        let init = cx.expr_or_init(e);
-
-        let Some(ty_has_interior_mutability) = is_cast_from_const_to_mut(cx, init) else {
-            return;
-        };
-        let orig_cast = if init.span != e.span { Some(init.span) } else { None };
-        let ty_has_interior_mutability = ty_has_interior_mutability.then_some(());
-
-        cx.emit_spanned_lint(
-            INVALID_REFERENCE_CASTING,
-            expr.span,
-            if is_assignment {
-                InvalidReferenceCastingDiag::AssignToRef { orig_cast, ty_has_interior_mutability }
-            } else {
-                InvalidReferenceCastingDiag::BorrowAsMut { orig_cast, ty_has_interior_mutability }
-            },
-        );
+        if let Some((e, pat)) = borrow_or_assign(cx, expr) {
+            if matches!(pat, PatternKind::Borrow { mutbl: Mutability::Mut } | PatternKind::Assign) {
+                let init = cx.expr_or_init(e);
+
+                let Some(ty_has_interior_mutability) = is_cast_from_ref_to_mut_ptr(cx, init) else {
+                    return;
+                };
+                let orig_cast = if init.span != e.span { Some(init.span) } else { None };
+                let ty_has_interior_mutability = ty_has_interior_mutability.then_some(());
+
+                cx.emit_spanned_lint(
+                    INVALID_REFERENCE_CASTING,
+                    expr.span,
+                    if pat == PatternKind::Assign {
+                        InvalidReferenceCastingDiag::AssignToRef {
+                            orig_cast,
+                            ty_has_interior_mutability,
+                        }
+                    } else {
+                        InvalidReferenceCastingDiag::BorrowAsMut {
+                            orig_cast,
+                            ty_has_interior_mutability,
+                        }
+                    },
+                );
+            }
+        }
     }
 }
 
-fn is_operation_we_care_about<'tcx>(
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum PatternKind {
+    Borrow { mutbl: Mutability },
+    Assign,
+}
+
+fn borrow_or_assign<'tcx>(
     cx: &LateContext<'tcx>,
     e: &'tcx Expr<'tcx>,
-) -> Option<(bool, &'tcx Expr<'tcx>)> {
-    fn deref_assign_or_addr_of<'tcx>(expr: &'tcx Expr<'tcx>) -> Option<(bool, &'tcx Expr<'tcx>)> {
-        // &mut <expr>
-        let inner = if let ExprKind::AddrOf(_, Mutability::Mut, expr) = expr.kind {
-            expr
+) -> Option<(&'tcx Expr<'tcx>, PatternKind)> {
+    fn deref_assign_or_addr_of<'tcx>(
+        expr: &'tcx Expr<'tcx>,
+    ) -> Option<(&'tcx Expr<'tcx>, PatternKind)> {
+        // &(mut) <expr>
+        let (inner, pat) = if let ExprKind::AddrOf(_, mutbl, expr) = expr.kind {
+            (expr, PatternKind::Borrow { mutbl })
         // <expr> = ...
         } else if let ExprKind::Assign(expr, _, _) = expr.kind {
-            expr
+            (expr, PatternKind::Assign)
         // <expr> += ...
         } else if let ExprKind::AssignOp(_, expr, _) = expr.kind {
-            expr
+            (expr, PatternKind::Assign)
         } else {
             return None;
         };
 
-        if let ExprKind::Unary(UnOp::Deref, e) = &inner.kind {
-            Some((!matches!(expr.kind, ExprKind::AddrOf(..)), e))
-        } else {
-            None
-        }
+        // *<inner>
+        let ExprKind::Unary(UnOp::Deref, e) = &inner.kind else {
+            return None;
+        };
+        Some((e, pat))
     }
 
     fn ptr_write<'tcx>(
         cx: &LateContext<'tcx>,
         e: &'tcx Expr<'tcx>,
-    ) -> Option<(bool, &'tcx Expr<'tcx>)> {
+    ) -> Option<(&'tcx Expr<'tcx>, PatternKind)> {
         if let ExprKind::Call(path, [arg_ptr, _arg_val]) = e.kind
             && let ExprKind::Path(ref qpath) = path.kind
             && let Some(def_id) = cx.qpath_res(qpath, path.hir_id).opt_def_id()
@@ -98,7 +112,7 @@ fn is_operation_we_care_about<'tcx>(
                 Some(sym::ptr_write | sym::ptr_write_volatile | sym::ptr_write_unaligned)
             )
         {
-            Some((true, arg_ptr))
+            Some((arg_ptr, PatternKind::Assign))
         } else {
             None
         }
@@ -107,20 +121,39 @@ fn is_operation_we_care_about<'tcx>(
     deref_assign_or_addr_of(e).or_else(|| ptr_write(cx, e))
 }
 
-fn is_cast_from_const_to_mut<'tcx>(
+fn is_cast_from_ref_to_mut_ptr<'tcx>(
     cx: &LateContext<'tcx>,
     orig_expr: &'tcx Expr<'tcx>,
 ) -> Option<bool> {
-    let mut need_check_freeze = false;
-    let mut e = orig_expr;
-
     let end_ty = cx.typeck_results().node_type(orig_expr.hir_id);
 
     // Bail out early if the end type is **not** a mutable pointer.
     if !matches!(end_ty.kind(), ty::RawPtr(TypeAndMut { ty: _, mutbl: Mutability::Mut })) {
         return None;
     }
 
+    let (e, need_check_freeze) = peel_casts(cx, orig_expr);
+
+    let start_ty = cx.typeck_results().node_type(e.hir_id);
+    if let ty::Ref(_, inner_ty, Mutability::Not) = start_ty.kind() {
+        // If an UnsafeCell method is involved, we need to additionally check the
+        // inner type for the presence of the Freeze trait (ie does NOT contain
+        // an UnsafeCell), since in that case we would incorrectly lint on valid casts.
+        //
+        // Except on the presence of non concrete skeleton types (ie generics)
+        // since there is no way to make it safe for arbitrary types.
+        let inner_ty_has_interior_mutability =
+            !inner_ty.is_freeze(cx.tcx, cx.param_env) && inner_ty.has_concrete_skeleton();
+        (!need_check_freeze || !inner_ty_has_interior_mutability)
+            .then_some(inner_ty_has_interior_mutability)
+    } else {
+        None
+    }
+}
+
+fn peel_casts<'tcx>(cx: &LateContext<'tcx>, mut e: &'tcx Expr<'tcx>) -> (&'tcx Expr<'tcx>, bool) {
+    let mut gone_trough_unsafe_cell_raw_get = false;
+
     loop {
         e = e.peel_blocks();
         // <expr> as ...
@@ -145,27 +178,18 @@ fn is_cast_from_const_to_mut<'tcx>(
             )
         {
             if cx.tcx.is_diagnostic_item(sym::unsafe_cell_raw_get, def_id) {
-                need_check_freeze = true;
+                gone_trough_unsafe_cell_raw_get = true;
             }
             arg
         } else {
-            break;
+            let init = cx.expr_or_init(e);
+            if init.hir_id != e.hir_id {
+                init
+            } else {
+                break;
+            }
         };
     }
 
-    let start_ty = cx.typeck_results().node_type(e.hir_id);
-    if let ty::Ref(_, inner_ty, Mutability::Not) = start_ty.kind() {
-        // If an UnsafeCell method is involved we need to additionally check the
-        // inner type for the presence of the Freeze trait (ie does NOT contain
-        // an UnsafeCell), since in that case we would incorrectly lint on valid casts.
-        //
-        // We also consider non concrete skeleton types (ie generics)
-        // to be an issue since there is no way to make it safe for abitrary types.
-        let inner_ty_has_interior_mutability =
-            !inner_ty.is_freeze(cx.tcx, cx.param_env) && inner_ty.has_concrete_skeleton();
-        (!need_check_freeze || !inner_ty_has_interior_mutability)
-            .then_some(inner_ty_has_interior_mutability)
-    } else {
-        None
-    }
+    (e, gone_trough_unsafe_cell_raw_get)
 }

compiler/rustc_mir_build/src/lib.rs

@@ -1,7 +1,6 @@
 //! Construction of MIR from HIR.
 //!
 //! This crate also contains the match exhaustiveness and usefulness checking.
-#![allow(rustc::potential_query_instability)]
 #![feature(assert_matches)]
 #![feature(associated_type_bounds)]
 #![feature(box_patterns)]

compiler/rustc_mir_build/src/thir/pattern/check_match.rs

@@ -9,7 +9,7 @@ use crate::errors::*;
 
 use rustc_arena::TypedArena;
 use rustc_ast::Mutability;
-use rustc_data_structures::fx::FxHashSet;
+use rustc_data_structures::fx::FxIndexSet;
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder, ErrorGuaranteed, MultiSpan};
 use rustc_hir as hir;
@@ -948,7 +948,7 @@ fn report_non_exhaustive_match<'p, 'tcx>(
     err.note(format!("the matched value is of type `{}`", scrut_ty));
 
     if !is_empty_match {
-        let mut non_exhaustive_tys = FxHashSet::default();
+        let mut non_exhaustive_tys = FxIndexSet::default();
         // Look at the first witness.
         collect_non_exhaustive_tys(cx, &witnesses[0], &mut non_exhaustive_tys);
 
@@ -1104,7 +1104,7 @@ fn joined_uncovered_patterns<'p, 'tcx>(
 fn collect_non_exhaustive_tys<'tcx>(
     cx: &MatchCheckCtxt<'_, 'tcx>,
     pat: &WitnessPat<'tcx>,
-    non_exhaustive_tys: &mut FxHashSet<Ty<'tcx>>,
+    non_exhaustive_tys: &mut FxIndexSet<Ty<'tcx>>,
 ) {
     if matches!(pat.ctor(), Constructor::NonExhaustive) {
         non_exhaustive_tys.insert(pat.ty());

src/librustdoc/clean/mod.rs

@@ -2646,6 +2646,40 @@ fn filter_tokens_from_list(
     tokens
 }
 
+fn filter_doc_attr_ident(ident: Symbol, is_inline: bool) -> bool {
+    if is_inline {
+        ident == sym::hidden || ident == sym::inline || ident == sym::no_inline
+    } else {
+        ident == sym::cfg
+    }
+}
+
+/// Remove attributes from `normal` that should not be inherited by `use` re-export.
+/// Before calling this function, make sure `normal` is a `#[doc]` attribute.
+fn filter_doc_attr(normal: &mut ast::NormalAttr, is_inline: bool) {
+    match normal.item.args {
+        ast::AttrArgs::Delimited(ref mut args) => {
+            let tokens = filter_tokens_from_list(&args.tokens, |token| {
+                !matches!(
+                    token,
+                    TokenTree::Token(
+                        Token {
+                            kind: TokenKind::Ident(
+                                ident,
+                                _,
+                            ),
+                            ..
+                        },
+                        _,
+                    ) if filter_doc_attr_ident(*ident, is_inline),
+                )
+            });
+            args.tokens = TokenStream::new(tokens);
+        }
+        ast::AttrArgs::Empty | ast::AttrArgs::Eq(..) => {}
+    }
+}
+
 /// When inlining items, we merge their attributes (and all the reexports attributes too) with the
 /// final reexport. For example:
 ///
@@ -2672,13 +2706,6 @@ fn add_without_unwanted_attributes<'hir>(
     is_inline: bool,
     import_parent: Option<DefId>,
 ) {
-    // If it's not `#[doc(inline)]`, we don't want all attributes, otherwise we keep everything.
-    if !is_inline {
-        for attr in new_attrs {
-            attrs.push((Cow::Borrowed(attr), import_parent));
-        }
-        return;
-    }
     for attr in new_attrs {
         if matches!(attr.kind, ast::AttrKind::DocComment(..)) {
             attrs.push((Cow::Borrowed(attr), import_parent));
@@ -2687,33 +2714,14 @@ fn add_without_unwanted_attributes<'hir>(
         let mut attr = attr.clone();
         match attr.kind {
             ast::AttrKind::Normal(ref mut normal) => {
-                if let [ident] = &*normal.item.path.segments
-                    && let ident = ident.ident.name
-                    && ident == sym::doc
-                {
-                    match normal.item.args {
-                        ast::AttrArgs::Delimited(ref mut args) => {
-                            let tokens = filter_tokens_from_list(&args.tokens, |token| {
-                                !matches!(
-                                    token,
-                                    TokenTree::Token(
-                                        Token {
-                                            kind: TokenKind::Ident(
-                                                sym::hidden | sym::inline | sym::no_inline,
-                                                _,
-                                            ),
-                                            ..
-                                        },
-                                        _,
-                                    ),
-                                )
-                            });
-                            args.tokens = TokenStream::new(tokens);
-                            attrs.push((Cow::Owned(attr), import_parent));
-                        }
-                        ast::AttrArgs::Empty | ast::AttrArgs::Eq(..) => {
-                            attrs.push((Cow::Owned(attr), import_parent));
-                        }
+                if let [ident] = &*normal.item.path.segments {
+                    let ident = ident.ident.name;
+                    if ident == sym::doc {
+                        filter_doc_attr(normal, is_inline);
+                        attrs.push((Cow::Owned(attr), import_parent));
+                    } else if ident != sym::cfg {
+                        // If it's not a `cfg()` attribute, we keep it.
+                        attrs.push((Cow::Owned(attr), import_parent));
                     }
                 }
             }

src/librustdoc/html/markdown.rs

@@ -2013,6 +2013,7 @@ fn init_id_map() -> FxHashMap<Cow<'static, str>, usize> {
     map.insert("themeStyle".into(), 1);
     map.insert("settings-menu".into(), 1);
     map.insert("help-button".into(), 1);
+    map.insert("sidebar-button".into(), 1);
     map.insert("main-content".into(), 1);
     map.insert("toggle-all-docs".into(), 1);
     map.insert("all-types".into(), 1);

src/librustdoc/html/render/print_item.rs

@@ -1,5 +1,3 @@
-use clean::AttributesExt;
-
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_hir as hir;
@@ -465,16 +463,9 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
 
             clean::ImportItem(ref import) => {
                 let stab_tags = if let Some(import_def_id) = import.source.did {
-                    let ast_attrs = tcx.get_attrs_unchecked(import_def_id);
-                    let import_attrs = Box::new(clean::Attributes::from_ast(ast_attrs));
-
                     // Just need an item with the correct def_id and attrs
-                    let import_item = clean::Item {
-                        item_id: import_def_id.into(),
-                        attrs: import_attrs,
-                        cfg: ast_attrs.cfg(tcx, &cx.cache().hidden_cfg),
-                        ..myitem.clone()
-                    };
+                    let import_item =
+                        clean::Item { item_id: import_def_id.into(), ..myitem.clone() };
 
                     let stab_tags = Some(extra_info_tags(&import_item, item, tcx).to_string());
                     stab_tags

src/librustdoc/html/static/css/noscript.css

@@ -9,7 +9,7 @@ rules.
 	margin-left: 0 !important;
 }
 
-#copy-path {
+#copy-path, #sidebar-button, .sidebar-resizer {
 	/* It requires JS to work so no need to display it in this case. */
 	display: none;
 }
@@ -132,6 +132,8 @@ nav.sub {
 	--scrape-example-help-hover-color: #000;
 	--scrape-example-code-wrapper-background-start: rgba(255, 255, 255, 1);
 	--scrape-example-code-wrapper-background-end: rgba(255, 255, 255, 0);
+	--sidebar-resizer-hover: hsl(207, 90%, 66%);
+	--sidebar-resizer-active: hsl(207, 90%, 54%);
 }
 /* End theme: light */
 
@@ -238,6 +240,8 @@ nav.sub {
 		--scrape-example-help-hover-color: #fff;
 		--scrape-example-code-wrapper-background-start: rgba(53, 53, 53, 1);
 		--scrape-example-code-wrapper-background-end: rgba(53, 53, 53, 0);
+		--sidebar-resizer-hover: hsl(207, 30%, 54%);
+		--sidebar-resizer-active: hsl(207, 90%, 54%);
 	}
 /* End theme: dark */
 }