Auto merge of rust-lang#132595 - matthiaskrgr:rollup-2904x8u, r=matth…

…iaskrgr

Rollup of 4 pull requests

Successful merges:

 - rust-lang#132153 (Stabilise `const_char_encode_utf16`.)
 - rust-lang#132355 (Fix compiler panic with a large number of threads)
 - rust-lang#132486 (No need to instantiate binder in `confirm_async_closure_candidate`)
 - rust-lang#132594 (Subtree update of `rust-analyzer`)

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

compiler/rustc_session/src/config.rs

@@ -2466,6 +2466,10 @@ pub fn build_session_options(early_dcx: &mut EarlyDiagCtxt, matches: &getopts::M
         early_dcx.early_fatal("value for threads must be a positive non-zero integer");
     }
 
+    if unstable_opts.threads == parse::MAX_THREADS_CAP {
+        early_dcx.early_warn(format!("number of threads was capped at {}", parse::MAX_THREADS_CAP));
+    }
+
     let fuel = unstable_opts.fuel.is_some() || unstable_opts.print_fuel.is_some();
     if fuel && unstable_opts.threads > 1 {
         early_dcx.early_fatal("optimization fuel is incompatible with multiple threads");

compiler/rustc_session/src/options.rs

@@ -457,10 +457,11 @@ mod desc {
         "either a boolean (`yes`, `no`, `on`, `off`, etc), or `nll` (default: `nll`)";
 }
 
-mod parse {
+pub mod parse {
     use std::str::FromStr;
 
     pub(crate) use super::*;
+    pub(crate) const MAX_THREADS_CAP: usize = 256;
 
     /// This is for boolean options that don't take a value and start with
     /// `no-`. This style of option is deprecated.
@@ -657,7 +658,7 @@ mod parse {
     }
 
     pub(crate) fn parse_threads(slot: &mut usize, v: Option<&str>) -> bool {
-        match v.and_then(|s| s.parse().ok()) {
+        let ret = match v.and_then(|s| s.parse().ok()) {
             Some(0) => {
                 *slot = std::thread::available_parallelism().map_or(1, NonZero::<usize>::get);
                 true
@@ -667,7 +668,11 @@ mod parse {
                 true
             }
             None => false,
-        }
+        };
+        // We want to cap the number of threads here to avoid large numbers like 999999 and compiler panics.
+        // This solution was suggested here https://github.com/rust-lang/rust/issues/117638#issuecomment-1800925067
+        *slot = slot.clone().min(MAX_THREADS_CAP);
+        ret
     }
 
     /// Use this for any numeric option that has a static default.

compiler/rustc_trait_selection/src/traits/select/confirmation.rs

@@ -951,18 +951,12 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 });
 
                 // We must additionally check that the return type impls `Future`.
-
-                // FIXME(async_closures): Investigate this before stabilization.
-                // We instantiate this binder eagerly because the `confirm_future_candidate`
-                // method doesn't support higher-ranked futures, which the `AsyncFn`
-                // traits expressly allow the user to write. To fix this correctly,
-                // we'd need to instantiate trait bounds before we get to selection,
-                // like the new trait solver does.
                 let future_trait_def_id = tcx.require_lang_item(LangItem::Future, None);
-                let placeholder_output_ty = self.infcx.enter_forall_and_leak_universe(sig.output());
                 nested.push(obligation.with(
                     tcx,
-                    ty::TraitRef::new(tcx, future_trait_def_id, [placeholder_output_ty]),
+                    sig.output().map_bound(|output_ty| {
+                        ty::TraitRef::new(tcx, future_trait_def_id, [output_ty])
+                    }),
                 ));
 
                 (trait_ref, Ty::from_closure_kind(tcx, ty::ClosureKind::Fn))

library/core/src/char/methods.rs

@@ -711,7 +711,7 @@ impl char {
     /// '𝕊'.encode_utf16(&mut b);
     /// ```
     #[stable(feature = "unicode_encode_char", since = "1.15.0")]
-    #[rustc_const_unstable(feature = "const_char_encode_utf16", issue = "130660")]
+    #[rustc_const_stable(feature = "const_char_encode_utf16", since = "CURRENT_RUSTC_VERSION")]
     #[inline]
     pub const fn encode_utf16(self, dst: &mut [u16]) -> &mut [u16] {
         encode_utf16_raw(self as u32, dst)
@@ -1819,7 +1819,10 @@ pub const fn encode_utf8_raw(code: u32, dst: &mut [u8]) -> &mut [u8] {
 /// Panics if the buffer is not large enough.
 /// A buffer of length 2 is large enough to encode any `char`.
 #[unstable(feature = "char_internals", reason = "exposed only for libstd", issue = "none")]
-#[rustc_const_unstable(feature = "const_char_encode_utf16", issue = "130660")]
+#[cfg_attr(
+    bootstrap,
+    rustc_const_stable(feature = "const_char_encode_utf16", since = "CURRENT_RUSTC_VERSION")
+)]
 #[doc(hidden)]
 #[inline]
 pub const fn encode_utf16_raw(mut code: u32, dst: &mut [u16]) -> &mut [u16] {

library/core/src/lib.rs

@@ -114,7 +114,6 @@
 #![feature(const_align_of_val_raw)]
 #![feature(const_alloc_layout)]
 #![feature(const_black_box)]
-#![feature(const_char_encode_utf16)]
 #![feature(const_eval_select)]
 #![feature(const_exact_div)]
 #![feature(const_float_methods)]

src/tools/rust-analyzer/.github/workflows/autopublish.yaml

@@ -51,6 +51,7 @@ jobs:
           cargo workspaces rename --from proc-macro-api proc_macro_api
           cargo workspaces rename --from proc-macro-srv proc_macro_srv
           cargo workspaces rename --from project-model project_model
+          cargo workspaces rename --from test-fixture test_fixture
           cargo workspaces rename --from test-utils test_utils
           cargo workspaces rename --from text-edit text_edit
           # Remove library crates from the workspaces so we don't auto-publish them as well

src/tools/rust-analyzer/Cargo.lock

@@ -1492,9 +1492,9 @@ dependencies = [
 
 [[package]]
 name = "ra-ap-rustc_abi"
-version = "0.75.0"
+version = "0.76.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d5bc2cfc7264d84215a08875ef90a1d35f76b5c9ad1993515d2da7e4e40b2b4b"
+checksum = "709fde78db053c78c87776ec738677649f791645883f82ff145f68caf9f18e1a"
 dependencies = [
  "bitflags 2.6.0",
  "ra-ap-rustc_index",
@@ -1503,9 +1503,9 @@ dependencies = [
 
 [[package]]
 name = "ra-ap-rustc_index"
-version = "0.75.0"
+version = "0.76.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e8929140697812e5dd09e19cf446d85146332363f0dbc125d4214834c34ead96"
+checksum = "da115d496e5abd65e2dceb6883d7597593badfe23fea3439202b8da5a11ea250"
 dependencies = [
  "arrayvec",
  "ra-ap-rustc_index_macros",
@@ -1514,9 +1514,9 @@ dependencies = [
 
 [[package]]
 name = "ra-ap-rustc_index_macros"
-version = "0.75.0"
+version = "0.76.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "514a3f5d04c8b4a2750f29746cc9abb1f78deb7e72e4ad1dc95bbc608f3db157"
+checksum = "be86d06a75a8125c1ace197d5030e6e02721348d32e572baea35c891669ad1e2"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1525,29 +1525,29 @@ dependencies = [
 
 [[package]]
 name = "ra-ap-rustc_lexer"
-version = "0.75.0"
+version = "0.76.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "276fcb1205da071a0cd64416f3f0e198043c11f176c5b501a45dbf0cb33979f2"
+checksum = "b64b46ae0d8f59acc32e64e0085532b831f0d6182d870a7cd86c046c2c46e722"
 dependencies = [
  "unicode-properties",
  "unicode-xid",
 ]
 
 [[package]]
 name = "ra-ap-rustc_parse_format"
-version = "0.75.0"
+version = "0.76.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "961b30b22cfac296b14b72e9f95e79c16cebc8c926872755fb1568a6c4243a62"
+checksum = "dbdaad19ddbd0ff46e947ca8dbb6ae678a112d3938669fb3ad6bfd244917e24b"
 dependencies = [
  "ra-ap-rustc_index",
  "ra-ap-rustc_lexer",
 ]
 
 [[package]]
 name = "ra-ap-rustc_pattern_analysis"
-version = "0.75.0"
+version = "0.76.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "614232513814a4b714fea7f11345d31c0c277bca3089bb6ca1ec20870bfc022a"
+checksum = "dc5761e37c78d98ede9f20f6b66526093d0be66aa256d5cbdf214495843ba74d"
 dependencies = [
  "ra-ap-rustc_index",
  "rustc-hash 2.0.0",

src/tools/rust-analyzer/Cargo.toml

@@ -84,11 +84,11 @@ tt = { path = "./crates/tt", version = "0.0.0" }
 vfs-notify = { path = "./crates/vfs-notify", version = "0.0.0" }
 vfs = { path = "./crates/vfs", version = "0.0.0" }
 
-ra-ap-rustc_lexer = { version = "0.75", default-features = false }
-ra-ap-rustc_parse_format = { version = "0.75", default-features = false }
-ra-ap-rustc_index = { version = "0.75", default-features = false }
-ra-ap-rustc_abi = { version = "0.75", default-features = false }
-ra-ap-rustc_pattern_analysis = { version = "0.75", default-features = false }
+ra-ap-rustc_lexer = { version = "0.76", default-features = false }
+ra-ap-rustc_parse_format = { version = "0.76", default-features = false }
+ra-ap-rustc_index = { version = "0.76", default-features = false }
+ra-ap-rustc_abi = { version = "0.76", default-features = false }
+ra-ap-rustc_pattern_analysis = { version = "0.76", default-features = false }
 
 # local crates that aren't published to crates.io. These should not have versions.
 test-fixture = { path = "./crates/test-fixture" }

src/tools/rust-analyzer/crates/hir-def/src/body/lower.rs

@@ -407,7 +407,7 @@ impl ExprCollector<'_> {
                 let method_name = e.name_ref().map(|nr| nr.as_name()).unwrap_or_else(Name::missing);
                 let generic_args = e
                     .generic_arg_list()
-                    .and_then(|it| GenericArgs::from_ast(&self.ctx(), it))
+                    .and_then(|it| GenericArgs::from_ast(&mut self.ctx(), it))
                     .map(Box::new);
                 self.alloc_expr(
                     Expr::MethodCall { receiver, method_name, args, generic_args },
@@ -533,7 +533,7 @@ impl ExprCollector<'_> {
             ast::Expr::TryExpr(e) => self.collect_try_operator(syntax_ptr, e),
             ast::Expr::CastExpr(e) => {
                 let expr = self.collect_expr_opt(e.expr());
-                let type_ref = TypeRef::from_ast_opt(&self.ctx(), e.ty());
+                let type_ref = TypeRef::from_ast_opt(&mut self.ctx(), e.ty());
                 self.alloc_expr(Expr::Cast { expr, type_ref }, syntax_ptr)
             }
             ast::Expr::RefExpr(e) => {
@@ -572,13 +572,15 @@ impl ExprCollector<'_> {
                     arg_types.reserve_exact(num_params);
                     for param in pl.params() {
                         let pat = this.collect_pat_top(param.pat());
-                        let type_ref = param.ty().map(|it| TypeRef::from_ast(&this.ctx(), it));
+                        let type_ref = param.ty().map(|it| TypeRef::from_ast(&mut this.ctx(), it));
                         args.push(pat);
                         arg_types.push(type_ref);
                     }
                 }
-                let ret_type =
-                    e.ret_type().and_then(|r| r.ty()).map(|it| TypeRef::from_ast(&this.ctx(), it));
+                let ret_type = e
+                    .ret_type()
+                    .and_then(|r| r.ty())
+                    .map(|it| TypeRef::from_ast(&mut this.ctx(), it));
 
                 let prev_is_lowering_coroutine = mem::take(&mut this.is_lowering_coroutine);
                 let prev_try_block_label = this.current_try_block_label.take();
@@ -705,7 +707,7 @@ impl ExprCollector<'_> {
             ast::Expr::UnderscoreExpr(_) => self.alloc_expr(Expr::Underscore, syntax_ptr),
             ast::Expr::AsmExpr(e) => self.lower_inline_asm(e, syntax_ptr),
             ast::Expr::OffsetOfExpr(e) => {
-                let container = TypeRef::from_ast_opt(&self.ctx(), e.ty());
+                let container = TypeRef::from_ast_opt(&mut self.ctx(), e.ty());
                 let fields = e.fields().map(|it| it.as_name()).collect();
                 self.alloc_expr(Expr::OffsetOf(OffsetOf { container, fields }), syntax_ptr)
             }
@@ -1317,7 +1319,7 @@ impl ExprCollector<'_> {
                     return;
                 }
                 let pat = self.collect_pat_top(stmt.pat());
-                let type_ref = stmt.ty().map(|it| TypeRef::from_ast(&self.ctx(), it));
+                let type_ref = stmt.ty().map(|it| TypeRef::from_ast(&mut self.ctx(), it));
                 let initializer = stmt.initializer().map(|e| self.collect_expr(e));
                 let else_branch = stmt
                     .let_else()

src/tools/rust-analyzer/crates/hir-def/src/data.rs

@@ -37,6 +37,7 @@ pub struct FunctionData {
     pub name: Name,
     pub params: Box<[TypeRefId]>,
     pub ret_type: TypeRefId,
+    // FIXME: why are these stored here? They should be accessed via the query
     pub attrs: Attrs,
     pub visibility: RawVisibility,
     pub abi: Option<Symbol>,

src/tools/rust-analyzer/crates/hir-def/src/dyn_map.rs

@@ -21,7 +21,79 @@
 //!
 //! This is a work of fiction. Any similarities to Kotlin's `BindingContext` are
 //! a coincidence.
-pub mod keys;
+
+pub mod keys {
+    use std::marker::PhantomData;
+
+    use hir_expand::{attrs::AttrId, MacroCallId};
+    use rustc_hash::FxHashMap;
+    use syntax::{ast, AstNode, AstPtr};
+
+    use crate::{
+        dyn_map::{DynMap, Policy},
+        BlockId, ConstId, EnumId, EnumVariantId, ExternCrateId, FieldId, FunctionId, ImplId,
+        LifetimeParamId, Macro2Id, MacroRulesId, ProcMacroId, StaticId, StructId, TraitAliasId,
+        TraitId, TypeAliasId, TypeOrConstParamId, UnionId, UseId,
+    };
+
+    pub type Key<K, V> = crate::dyn_map::Key<AstPtr<K>, V, AstPtrPolicy<K, V>>;
+
+    pub const BLOCK: Key<ast::BlockExpr, BlockId> = Key::new();
+    pub const FUNCTION: Key<ast::Fn, FunctionId> = Key::new();
+    pub const CONST: Key<ast::Const, ConstId> = Key::new();
+    pub const STATIC: Key<ast::Static, StaticId> = Key::new();
+    pub const TYPE_ALIAS: Key<ast::TypeAlias, TypeAliasId> = Key::new();
+    pub const IMPL: Key<ast::Impl, ImplId> = Key::new();
+    pub const TRAIT: Key<ast::Trait, TraitId> = Key::new();
+    pub const TRAIT_ALIAS: Key<ast::TraitAlias, TraitAliasId> = Key::new();
+    pub const STRUCT: Key<ast::Struct, StructId> = Key::new();
+    pub const UNION: Key<ast::Union, UnionId> = Key::new();
+    pub const ENUM: Key<ast::Enum, EnumId> = Key::new();
+    pub const EXTERN_CRATE: Key<ast::ExternCrate, ExternCrateId> = Key::new();
+    pub const USE: Key<ast::Use, UseId> = Key::new();
+
+    pub const ENUM_VARIANT: Key<ast::Variant, EnumVariantId> = Key::new();
+    pub const TUPLE_FIELD: Key<ast::TupleField, FieldId> = Key::new();
+    pub const RECORD_FIELD: Key<ast::RecordField, FieldId> = Key::new();
+    pub const TYPE_PARAM: Key<ast::TypeParam, TypeOrConstParamId> = Key::new();
+    pub const CONST_PARAM: Key<ast::ConstParam, TypeOrConstParamId> = Key::new();
+    pub const LIFETIME_PARAM: Key<ast::LifetimeParam, LifetimeParamId> = Key::new();
+
+    pub const MACRO_RULES: Key<ast::MacroRules, MacroRulesId> = Key::new();
+    pub const MACRO2: Key<ast::MacroDef, Macro2Id> = Key::new();
+    pub const PROC_MACRO: Key<ast::Fn, ProcMacroId> = Key::new();
+    pub const MACRO_CALL: Key<ast::MacroCall, MacroCallId> = Key::new();
+    pub const ATTR_MACRO_CALL: Key<ast::Item, MacroCallId> = Key::new();
+    pub const DERIVE_MACRO_CALL: Key<ast::Attr, (AttrId, MacroCallId, Box<[Option<MacroCallId>]>)> =
+        Key::new();
+
+    /// XXX: AST Nodes and SyntaxNodes have identity equality semantics: nodes are
+    /// equal if they point to exactly the same object.
+    ///
+    /// In general, we do not guarantee that we have exactly one instance of a
+    /// syntax tree for each file. We probably should add such guarantee, but, for
+    /// the time being, we will use identity-less AstPtr comparison.
+    pub struct AstPtrPolicy<AST, ID> {
+        _phantom: PhantomData<(AST, ID)>,
+    }
+
+    impl<AST: AstNode + 'static, ID: 'static> Policy for AstPtrPolicy<AST, ID> {
+        type K = AstPtr<AST>;
+        type V = ID;
+        fn insert(map: &mut DynMap, key: AstPtr<AST>, value: ID) {
+            map.map
+                .entry::<FxHashMap<AstPtr<AST>, ID>>()
+                .or_insert_with(Default::default)
+                .insert(key, value);
+        }
+        fn get<'a>(map: &'a DynMap, key: &AstPtr<AST>) -> Option<&'a ID> {
+            map.map.get::<FxHashMap<AstPtr<AST>, ID>>()?.get(key)
+        }
+        fn is_empty(map: &DynMap) -> bool {
+            map.map.get::<FxHashMap<AstPtr<AST>, ID>>().map_or(true, |it| it.is_empty())
+        }
+    }
+}
 
 use std::{
     hash::Hash,