Auto merge of #145074 - tgross35:rollup-0tillrm, r=tgross35

Rollup of 9 pull requests

Successful merges:

 - #144705 (compiler-builtins: plumb LSE support for aarch64 on linux/gnu when optimized-compiler-builtins not enabled)
 - #144857 (Port `#[allow_internal_unsafe]` to the new attribute system)
 - #144900 (Stabilize `unsigned_signed_diff` feature)
 - #144903 (Rename `begin_panic_handler` to `panic_handler`)
 - #144974 (compiler-builtins subtree update)
 - #145007 (Fix build/doc/test of error index generator)
 - #145018 (Derive `Hash` for rustc_public types)
 - #145045 (doc(library): Fix Markdown in `Iterator::by_ref`)
 - #145046 (Fix doc comment of File::try_lock and File::try_lock_shared)

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

Author: bors

compiler/rustc_attr_parsing/src/attributes/macro_attrs.rs

@@ -113,3 +113,11 @@ impl<S: Stage> AttributeParser<S> for MacroUseParser {
         Some(AttributeKind::MacroUse { span: self.first_span?, arguments: self.state })
     }
 }
+
+pub(crate) struct AllowInternalUnsafeParser;
+
+impl<S: Stage> NoArgsAttributeParser<S> for AllowInternalUnsafeParser {
+    const PATH: &[Symbol] = &[sym::allow_internal_unsafe];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Ignore;
+    const CREATE: fn(Span) -> AttributeKind = |span| AttributeKind::AllowInternalUnsafe(span);
+}

compiler/rustc_attr_parsing/src/context.rs

@@ -33,7 +33,9 @@ use crate::attributes::lint_helpers::{
     AsPtrParser, AutomaticallyDerivedParser, PassByValueParser, PubTransparentParser,
 };
 use crate::attributes::loop_match::{ConstContinueParser, LoopMatchParser};
-use crate::attributes::macro_attrs::{MacroEscapeParser, MacroUseParser};
+use crate::attributes::macro_attrs::{
+    AllowInternalUnsafeParser, MacroEscapeParser, MacroUseParser,
+};
 use crate::attributes::must_use::MustUseParser;
 use crate::attributes::no_implicit_prelude::NoImplicitPreludeParser;
 use crate::attributes::non_exhaustive::NonExhaustiveParser;
@@ -178,6 +180,7 @@ attribute_parsers!(
         Single<SkipDuringMethodDispatchParser>,
         Single<TransparencyParser>,
         Single<WithoutArgs<AllowIncoherentImplParser>>,
+        Single<WithoutArgs<AllowInternalUnsafeParser>>,
         Single<WithoutArgs<AsPtrParser>>,
         Single<WithoutArgs<AutomaticallyDerivedParser>>,
         Single<WithoutArgs<CoherenceIsCoreParser>>,

compiler/rustc_expand/src/base.rs

@@ -905,10 +905,7 @@ impl SyntaxExtension {
             find_attr!(attrs, AttributeKind::AllowInternalUnstable(i, _) => i)
                 .map(|i| i.as_slice())
                 .unwrap_or_default();
-        // FIXME(jdonszelman): allow_internal_unsafe isn't yet new-style
-        // let allow_internal_unsafe = find_attr!(attrs, AttributeKind::AllowInternalUnsafe);
-        let allow_internal_unsafe =
-            ast::attr::find_by_name(attrs, sym::allow_internal_unsafe).is_some();
+        let allow_internal_unsafe = find_attr!(attrs, AttributeKind::AllowInternalUnsafe(_));
 
         let local_inner_macros = ast::attr::find_by_name(attrs, sym::macro_export)
             .and_then(|macro_export| macro_export.meta_item_list())

compiler/rustc_hir/src/attrs/data_structures.rs

@@ -249,6 +249,9 @@ pub enum AttributeKind {
     /// Represents `#[rustc_allow_incoherent_impl]`.
     AllowIncoherentImpl(Span),
 
+    /// Represents `#[allow_internal_unsafe]`.
+    AllowInternalUnsafe(Span),
+
     /// Represents `#[allow_internal_unstable]`.
     AllowInternalUnstable(ThinVec<(Symbol, Span)>, Span),
 

compiler/rustc_hir/src/attrs/encode_cross_crate.rs

@@ -16,6 +16,7 @@ impl AttributeKind {
             Align { .. } => No,
             AllowConstFnUnstable(..) => No,
             AllowIncoherentImpl(..) => No,
+            AllowInternalUnsafe(..) => Yes,
             AllowInternalUnstable(..) => Yes,
             AsPtr(..) => Yes,
             AutomaticallyDerived(..) => Yes,

compiler/rustc_lint/src/builtin.rs

@@ -14,13 +14,15 @@
 //! [`crate::late_lint_methods!`] invocation in `lib.rs`.
 
 use std::fmt::Write;
+use std::slice;
 
 use ast::token::TokenKind;
 use rustc_abi::BackendRepr;
 use rustc_ast::tokenstream::{TokenStream, TokenTree};
 use rustc_ast::visit::{FnCtxt, FnKind};
 use rustc_ast::{self as ast, *};
 use rustc_ast_pretty::pprust::expr_to_string;
+use rustc_attr_parsing::AttributeParser;
 use rustc_errors::{Applicability, LintDiagnostic};
 use rustc_feature::GateIssue;
 use rustc_hir as hir;
@@ -249,7 +251,16 @@ impl UnsafeCode {
 
 impl EarlyLintPass for UnsafeCode {
     fn check_attribute(&mut self, cx: &EarlyContext<'_>, attr: &ast::Attribute) {
-        if attr.has_name(sym::allow_internal_unsafe) {
+        if AttributeParser::parse_limited(
+            cx.builder.sess(),
+            slice::from_ref(attr),
+            sym::allow_internal_unsafe,
+            attr.span,
+            DUMMY_NODE_ID,
+            Some(cx.builder.features()),
+        )
+        .is_some()
+        {
             self.report_unsafe(cx, attr.span, BuiltinUnsafe::AllowInternalUnsafe);
         }
     }

compiler/rustc_passes/messages.ftl

@@ -29,7 +29,7 @@ passes_allow_incoherent_impl =
     `rustc_allow_incoherent_impl` attribute should be applied to impl items
     .label = the only currently supported targets are inherent methods
 
-passes_allow_internal_unstable =
+passes_macro_only_attribute =
     attribute should be applied to a macro
     .label = not a macro
 

compiler/rustc_passes/src/check_attr.rs

@@ -207,6 +207,9 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                 Attribute::Parsed(AttributeKind::ConstContinue(attr_span)) => {
                     self.check_const_continue(hir_id, *attr_span, target)
                 }
+                Attribute::Parsed(AttributeKind::AllowInternalUnsafe(attr_span)) => {
+                    self.check_allow_internal_unsafe(hir_id, *attr_span, span, target, attrs)
+                }
                 Attribute::Parsed(AttributeKind::AllowInternalUnstable(_, first_span)) => {
                     self.check_allow_internal_unstable(hir_id, *first_span, span, target, attrs)
                 }
@@ -413,7 +416,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                             // internal
                             | sym::prelude_import
                             | sym::panic_handler
-                            | sym::allow_internal_unsafe
                             | sym::lang
                             | sym::needs_allocator
                             | sym::default_lib_allocator
@@ -2212,14 +2214,49 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
 
     /// Outputs an error for `#[allow_internal_unstable]` which can only be applied to macros.
     /// (Allows proc_macro functions)
-    // FIXME(jdonszelmann): if possible, move to attr parsing
     fn check_allow_internal_unstable(
         &self,
         hir_id: HirId,
         attr_span: Span,
         span: Span,
         target: Target,
         attrs: &[Attribute],
+    ) {
+        self.check_macro_only_attr(
+            hir_id,
+            attr_span,
+            span,
+            target,
+            attrs,
+            "allow_internal_unstable",
+        )
+    }
+
+    /// Outputs an error for `#[allow_internal_unsafe]` which can only be applied to macros.
+    /// (Allows proc_macro functions)
+    fn check_allow_internal_unsafe(
+        &self,
+        hir_id: HirId,
+        attr_span: Span,
+        span: Span,
+        target: Target,
+        attrs: &[Attribute],
+    ) {
+        self.check_macro_only_attr(hir_id, attr_span, span, target, attrs, "allow_internal_unsafe")
+    }
+
+    /// Outputs an error for attributes that can only be applied to macros, such as
+    /// `#[allow_internal_unsafe]` and `#[allow_internal_unstable]`.
+    /// (Allows proc_macro functions)
+    // FIXME(jdonszelmann): if possible, move to attr parsing
+    fn check_macro_only_attr(
+        &self,
+        hir_id: HirId,
+        attr_span: Span,
+        span: Span,
+        target: Target,
+        attrs: &[Attribute],
+        attr_name: &str,
     ) {
         match target {
             Target::Fn => {
@@ -2238,18 +2275,14 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
             // erroneously allowed it and some crates used it accidentally, to be compatible
             // with crates depending on them, we can't throw an error here.
             Target::Field | Target::Arm => {
-                self.inline_attr_str_error_without_macro_def(
-                    hir_id,
-                    attr_span,
-                    "allow_internal_unstable",
-                );
+                self.inline_attr_str_error_without_macro_def(hir_id, attr_span, attr_name);
                 return;
             }
             // otherwise continue out of the match
             _ => {}
         }
 
-        self.tcx.dcx().emit_err(errors::AllowInternalUnstable { attr_span, span });
+        self.tcx.dcx().emit_err(errors::MacroOnlyAttribute { attr_span, span });
     }
 
     /// Checks if the items on the `#[debugger_visualizer]` attribute are valid.

compiler/rustc_passes/src/errors.rs

@@ -643,8 +643,8 @@ pub(crate) struct UsedStatic {
 }
 
 #[derive(Diagnostic)]
-#[diag(passes_allow_internal_unstable)]
-pub(crate) struct AllowInternalUnstable {
+#[diag(passes_macro_only_attribute)]
+pub(crate) struct MacroOnlyAttribute {
     #[primary_span]
     pub attr_span: Span,
     #[label]

compiler/rustc_public/src/mir/body.rs

@@ -349,7 +349,7 @@ impl AssertMessage {
     }
 }
 
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum BinOp {
     Add,
     AddUnchecked,
@@ -384,7 +384,7 @@ impl BinOp {
     }
 }
 
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum UnOp {
     Not,
     Neg,
@@ -490,7 +490,7 @@ pub enum StatementKind {
     Nop,
 }
 
-#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum Rvalue {
     /// Creates a pointer with the indicated mutability to the place.
     ///
@@ -666,7 +666,7 @@ impl Rvalue {
     }
 }
 
-#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum AggregateKind {
     Array(Ty),
     Tuple,
@@ -677,14 +677,14 @@ pub enum AggregateKind {
     RawPtr(Ty, Mutability),
 }
 
-#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum Operand {
     Copy(Place),
     Move(Place),
     Constant(ConstOperand),
 }
 
-#[derive(Clone, Eq, PartialEq, Serialize)]
+#[derive(Clone, Eq, PartialEq, Hash, Serialize)]
 pub struct Place {
     pub local: Local,
     /// projection out of a place (access a field, deref a pointer, etc)
@@ -697,7 +697,7 @@ impl From<Local> for Place {
     }
 }
 
-#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub struct ConstOperand {
     pub span: Span,
     pub user_ty: Option<UserTypeAnnotationIndex>,
@@ -770,7 +770,7 @@ pub enum VarDebugInfoContents {
 // ProjectionElem<Local, Ty>) and user-provided type annotations (for which the projection elements
 // are of type ProjectionElem<(), ()>).
 // In rustc_public's IR we don't need this generality, so we just use ProjectionElem for Places.
-#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum ProjectionElem {
     /// Dereference projections (e.g. `*_1`) project to the address referenced by the base place.
     Deref,
@@ -913,7 +913,7 @@ impl SwitchTargets {
     }
 }
 
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum BorrowKind {
     /// Data must be immutable and is aliasable.
     Shared,
@@ -940,7 +940,7 @@ impl BorrowKind {
     }
 }
 
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum RawPtrKind {
     Mut,
     Const,
@@ -958,14 +958,14 @@ impl RawPtrKind {
     }
 }
 
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum MutBorrowKind {
     Default,
     TwoPhaseBorrow,
     ClosureCapture,
 }
 
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum FakeBorrowKind {
     /// A shared (deep) borrow. Data must be immutable and is aliasable.
     Deep,
@@ -982,13 +982,13 @@ pub enum Mutability {
     Mut,
 }
 
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum Safety {
     Safe,
     Unsafe,
 }
 
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum PointerCoercion {
     /// Go from a fn-item type to a fn-pointer type.
     ReifyFnPointer,
@@ -1015,7 +1015,7 @@ pub enum PointerCoercion {
     Unsize,
 }
 
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum CastKind {
     // FIXME(smir-rename): rename this to PointerExposeProvenance
     PointerExposeAddress,
@@ -1030,7 +1030,7 @@ pub enum CastKind {
     Transmute,
 }
 
-#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
+#[derive(Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum NullOp {
     /// Returns the size of a value of that type.
     SizeOf,