Auto merge of #101592 - compiler-errors:rollup-d2fya7z, r=compiler-errors

Rollup of 7 pull requests

Successful merges:

 - #101423 (Fix hermit warnings)
 - #101499 (Introduce lowering_arena to avoid creating AST nodes on the fly)
 - #101530 (llvm-wrapper: adapt for LLVM API changes)
 - #101554 (rustdoc: remove unused CSS `#implementations-list > h3 > span.in-band`)
 - #101580 (rustdoc: remove unused CSS `div.impl-items > div`)
 - #101584 (rustdoc: remove no-op CSS `#settings-menu { padding: 0 }`)
 - #101587 (Make `Debug` impl for `Term` useful)

Failed merges:

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

compiler/rustc_ast_lowering/src/item.rs

@@ -1,6 +1,6 @@
 use super::errors::{InvalidAbi, MisplacedRelaxTraitBound};
 use super::ResolverAstLoweringExt;
-use super::{AstOwner, ImplTraitContext, ImplTraitPosition};
+use super::{Arena, AstOwner, ImplTraitContext, ImplTraitPosition};
 use super::{FnDeclKind, LoweringContext, ParamMode};
 
 use rustc_ast::ptr::P;
@@ -25,6 +25,7 @@ use std::iter;
 pub(super) struct ItemLowerer<'a, 'hir> {
     pub(super) tcx: TyCtxt<'hir>,
     pub(super) resolver: &'a mut ResolverAstLowering,
+    pub(super) ast_arena: &'a Arena<'static>,
     pub(super) ast_index: &'a IndexVec<LocalDefId, AstOwner<'a>>,
     pub(super) owners: &'a mut IndexVec<LocalDefId, hir::MaybeOwner<&'hir hir::OwnerInfo<'hir>>>,
 }
@@ -60,6 +61,7 @@ impl<'a, 'hir> ItemLowerer<'a, 'hir> {
             tcx: self.tcx,
             resolver: self.resolver,
             arena: self.tcx.hir_arena,
+            ast_arena: self.ast_arena,
 
             // HirId handling.
             bodies: Vec::new(),

compiler/rustc_ast_lowering/src/lib.rs

@@ -44,6 +44,7 @@ extern crate tracing;
 
 use crate::errors::{AssocTyParentheses, AssocTyParenthesesSub, MisplacedImplTrait};
 
+use rustc_arena::declare_arena;
 use rustc_ast::ptr::P;
 use rustc_ast::visit;
 use rustc_ast::{self as ast, *};
@@ -95,6 +96,13 @@ struct LoweringContext<'a, 'hir> {
     /// Used to allocate HIR nodes.
     arena: &'hir hir::Arena<'hir>,
 
+    /// Used to allocate temporary AST nodes for use during lowering.
+    /// This allows us to create "fake" AST -- these nodes can sometimes
+    /// be allocated on the stack, but other times we need them to live longer
+    /// than the current stack frame, so they can be collected into vectors
+    /// and things like that.
+    ast_arena: &'a Arena<'static>,
+
     /// Bodies inside the owner being lowered.
     bodies: Vec<(hir::ItemLocalId, &'hir hir::Body<'hir>)>,
     /// Attributes inside the owner being lowered.
@@ -140,6 +148,15 @@ struct LoweringContext<'a, 'hir> {
     generics_def_id_map: Vec<FxHashMap<LocalDefId, LocalDefId>>,
 }
 
+declare_arena!([
+    [] tys: rustc_ast::Ty,
+    [] aba: rustc_ast::AngleBracketedArgs,
+    [] ptr: rustc_ast::PolyTraitRef,
+    // This _marker field is needed because `declare_arena` creates `Arena<'tcx>` and we need to
+    // use `'tcx`. If we don't have this we get a compile error.
+    [] _marker: std::marker::PhantomData<&'tcx ()>,
+]);
+
 trait ResolverAstLoweringExt {
     fn legacy_const_generic_args(&self, expr: &Expr) -> Option<Vec<usize>>;
     fn get_partial_res(&self, id: NodeId) -> Option<PartialRes>;
@@ -401,10 +418,13 @@ pub fn lower_to_hir<'hir>(tcx: TyCtxt<'hir>, (): ()) -> hir::Crate<'hir> {
         tcx.definitions_untracked().def_index_count(),
     );
 
+    let ast_arena = Arena::default();
+
     for def_id in ast_index.indices() {
         item::ItemLowerer {
             tcx,
             resolver: &mut resolver,
+            ast_arena: &ast_arena,
             ast_index: &ast_index,
             owners: &mut owners,
         }
@@ -974,12 +994,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                 }
                 GenericArgs::Parenthesized(ref data) => {
                     self.emit_bad_parenthesized_trait_in_assoc_ty(data);
-                    self.lower_angle_bracketed_parameter_data(
-                        &data.as_angle_bracketed_args(),
-                        ParamMode::Explicit,
-                        itctx,
-                    )
-                    .0
+                    let aba = self.ast_arena.aba.alloc(data.as_angle_bracketed_args());
+                    self.lower_angle_bracketed_parameter_data(aba, ParamMode::Explicit, itctx).0
                 }
             };
             gen_args_ctor.into_generic_args(self)
@@ -1048,15 +1064,13 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
 
                     self.with_dyn_type_scope(false, |this| {
                         let node_id = this.next_node_id();
-                        let ty = this.lower_ty(
-                            &Ty {
-                                id: node_id,
-                                kind: TyKind::ImplTrait(impl_trait_node_id, bounds.clone()),
-                                span: this.lower_span(constraint.span),
-                                tokens: None,
-                            },
-                            itctx,
-                        );
+                        let ty = this.ast_arena.tys.alloc(Ty {
+                            id: node_id,
+                            kind: TyKind::ImplTrait(impl_trait_node_id, bounds.clone()),
+                            span: this.lower_span(constraint.span),
+                            tokens: None,
+                        });
+                        let ty = this.lower_ty(ty, itctx);
 
                         hir::TypeBindingKind::Equality { term: ty.into() }
                     })
@@ -1192,12 +1206,13 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             && let Res::Def(DefKind::Trait | DefKind::TraitAlias, _) = partial_res.base_res()
         {
             let (bounds, lifetime_bound) = self.with_dyn_type_scope(true, |this| {
+                let poly_trait_ref = this.ast_arena.ptr.alloc(PolyTraitRef {
+                    bound_generic_params: vec![],
+                    trait_ref: TraitRef { path: path.clone(), ref_id: t.id },
+                    span: t.span
+                });
                 let bound = this.lower_poly_trait_ref(
-                    &PolyTraitRef {
-                        bound_generic_params: vec![],
-                        trait_ref: TraitRef { path: path.clone(), ref_id: t.id },
-                        span: t.span
-                    },
+                    poly_trait_ref,
                     itctx,
                 );
                 let bounds = this.arena.alloc_from_iter([bound]);

compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp

@@ -936,12 +936,14 @@ LLVMRustOptimizeWithNewPassManager(
           /*CompileKernel=*/false);
       OptimizerLastEPCallbacks.push_back(
         [Options](ModulePassManager &MPM, OptimizationLevel Level) {
-#if LLVM_VERSION_GE(14, 0)
+#if LLVM_VERSION_GE(14, 0) && LLVM_VERSION_LT(16, 0)
           MPM.addPass(ModuleMemorySanitizerPass(Options));
 #else
           MPM.addPass(MemorySanitizerPass(Options));
 #endif
+#if LLVM_VERSION_LT(16, 0)
           MPM.addPass(createModuleToFunctionPassAdaptor(MemorySanitizerPass(Options)));
+#endif
         }
       );
     }
@@ -972,7 +974,11 @@ LLVMRustOptimizeWithNewPassManager(
             /*UseAfterScope=*/true,
             AsanDetectStackUseAfterReturnMode::Runtime,
           };
+#if LLVM_VERSION_LT(16, 0)
           MPM.addPass(ModuleAddressSanitizerPass(opts));
+#else
+          MPM.addPass(AddressSanitizerPass(opts));
+#endif
 #else
           MPM.addPass(ModuleAddressSanitizerPass(
               /*CompileKernel=*/false, SanitizerOptions->SanitizeAddressRecover));

compiler/rustc_middle/src/ty/mod.rs

@@ -915,12 +915,25 @@ pub struct CoercePredicate<'tcx> {
 }
 pub type PolyCoercePredicate<'tcx> = ty::Binder<'tcx, CoercePredicate<'tcx>>;
 
-#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Term<'tcx> {
     ptr: NonZeroUsize,
     marker: PhantomData<(Ty<'tcx>, Const<'tcx>)>,
 }
 
+impl Debug for Term<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let data = if let Some(ty) = self.ty() {
+            format!("Term::Ty({:?})", ty)
+        } else if let Some(ct) = self.ct() {
+            format!("Term::Ct({:?})", ct)
+        } else {
+            unreachable!()
+        };
+        f.write_str(&data)
+    }
+}
+
 impl<'tcx> From<Ty<'tcx>> for Term<'tcx> {
     fn from(ty: Ty<'tcx>) -> Self {
         TermKind::Ty(ty).pack()

library/std/src/sys/hermit/mutex.rs

@@ -2,7 +2,6 @@ use crate::cell::UnsafeCell;
 use crate::collections::VecDeque;
 use crate::hint;
 use crate::ops::{Deref, DerefMut, Drop};
-use crate::ptr;
 use crate::sync::atomic::{AtomicUsize, Ordering};
 use crate::sys::hermit::abi;
 

library/std/src/sys/hermit/net.rs

@@ -487,6 +487,4 @@ pub mod netc {
 
     #[derive(Copy, Clone)]
     pub struct sockaddr {}
-
-    pub type socklen_t = usize;
 }

library/std/src/sys/hermit/rwlock.rs

@@ -1,6 +1,5 @@
 use crate::cell::UnsafeCell;
 use crate::sys::locks::{MovableCondvar, Mutex};
-use crate::sys_common::lazy_box::{LazyBox, LazyInit};
 
 pub struct RwLock {
     lock: Mutex,

src/librustdoc/html/static/css/rustdoc.css

@@ -197,10 +197,6 @@ h4.code-header {
 	position: relative;
 }
 
-div.impl-items > div {
-	padding-left: 0;
-}
-
 h1, h2, h3, h4, h5, h6,
 .sidebar,
 .mobile-topbar,
@@ -212,7 +208,6 @@ a.source,
 span.since,
 #source-sidebar, #sidebar-toggle,
 details.rustdoc-toggle > summary::before,
-div.impl-items > div:not(.docblock):not(.item-info),
 .content ul.crate a.crate,
 a.srclink,
 #help-button > button,
@@ -1449,9 +1444,7 @@ pre.rust {
 	border-radius: 2px;
 	cursor: pointer;
 }
-#settings-menu {
-	padding: 0;
-}
+
 #settings-menu > a, #help-button > button {
 	padding: 5px;
 	height: 100%;
@@ -1528,10 +1521,6 @@ kbd {
 	cursor: default;
 }
 
-#implementations-list > h3 > span.in-band {
-	width: 100%;
-}
-
 #main-content > ul {
 	padding-left: 10px;
 }