Auto merge of #79167 - m-ou-se:rollup-4g15apk, r=m-ou-se

Rollup of 11 pull requests

Successful merges:

 - #78361 (Updated the list of white-listed target features for x86)
 - #78785 (linux: try to use libc getrandom to allow interposition)
 - #78999 (stability: More precise location for deprecation lint on macros)
 - #79039 (Tighten the bounds on atomic Ordering in std::sys::unix::weak::Weak)
 - #79079 (Turn top-level comments into module docs in MIR visitor)
 - #79114 (add trailing_zeros and leading_zeros to non zero types)
 - #79131 (Enable AVX512 *epi64 variants by updating stdarch)
 - #79133 (bootstrap: use the same version number for rustc and cargo)
 - #79145 (Fix handling of panic calls)
 - #79151 (Fix typo in `std::io::Write` docs)
 - #79158 (type is too big -> values of the type are too big)

Failed merges:

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

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -129,13 +129,23 @@ pub fn time_trace_profiler_finish(file_name: &str) {
 // WARNING: the features after applying `to_llvm_feature` must be known
 // to LLVM or the feature detection code will walk past the end of the feature
 // array, leading to crashes.
+// To find a list of LLVM's names, check llvm-project/llvm/include/llvm/Support/*TargetParser.def
+// where the * matches the architecture's name
+// Beware to not use the llvm github project for this, but check the git submodule
+// found in src/llvm-project
+// Though note that Rust can also be build with an external precompiled version of LLVM
+// which might lead to failures if the oldest tested / supported LLVM version
+// doesn't yet support the relevant intrinsics
 pub fn to_llvm_feature<'a>(sess: &Session, s: &'a str) -> &'a str {
     let arch = if sess.target.arch == "x86_64" { "x86" } else { &*sess.target.arch };
     match (arch, s) {
         ("x86", "pclmulqdq") => "pclmul",
         ("x86", "rdrand") => "rdrnd",
         ("x86", "bmi1") => "bmi",
         ("x86", "cmpxchg16b") => "cx16",
+        ("x86", "avx512vaes") => "vaes",
+        ("x86", "avx512gfni") => "gfni",
+        ("x86", "avx512vpclmulqdq") => "vpclmulqdq",
         ("aarch64", "fp") => "fp-armv8",
         ("aarch64", "fp16") => "fullfp16",
         (_, s) => s,

compiler/rustc_codegen_ssa/src/target_features.rs

@@ -4,6 +4,11 @@ use rustc_session::Session;
 use rustc_span::symbol::sym;
 use rustc_span::symbol::Symbol;
 
+// When adding features to the below lists
+// check whether they're named already elsewhere in rust
+// e.g. in stdarch and whether the given name matches LLVM's
+// if it doesn't, to_llvm_feature in llvm_util in rustc_codegen_llvm needs to be adapted
+
 const ARM_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     ("aclass", Some(sym::arm_target_feature)),
     ("mclass", Some(sym::arm_target_feature)),
@@ -50,15 +55,23 @@ const X86_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     ("aes", None),
     ("avx", None),
     ("avx2", None),
+    ("avx512bf16", Some(sym::avx512_target_feature)),
+    ("avx512bitalg", Some(sym::avx512_target_feature)),
     ("avx512bw", Some(sym::avx512_target_feature)),
     ("avx512cd", Some(sym::avx512_target_feature)),
     ("avx512dq", Some(sym::avx512_target_feature)),
     ("avx512er", Some(sym::avx512_target_feature)),
     ("avx512f", Some(sym::avx512_target_feature)),
+    ("avx512gfni", Some(sym::avx512_target_feature)),
     ("avx512ifma", Some(sym::avx512_target_feature)),
     ("avx512pf", Some(sym::avx512_target_feature)),
+    ("avx512vaes", Some(sym::avx512_target_feature)),
     ("avx512vbmi", Some(sym::avx512_target_feature)),
+    ("avx512vbmi2", Some(sym::avx512_target_feature)),
     ("avx512vl", Some(sym::avx512_target_feature)),
+    ("avx512vnni", Some(sym::avx512_target_feature)),
+    ("avx512vp2intersect", Some(sym::avx512_target_feature)),
+    ("avx512vpclmulqdq", Some(sym::avx512_target_feature)),
     ("avx512vpopcntdq", Some(sym::avx512_target_feature)),
     ("bmi1", None),
     ("bmi2", None),

compiler/rustc_middle/src/middle/stability.rs

@@ -4,7 +4,7 @@
 pub use self::StabilityLevel::*;
 
 use crate::ty::{self, TyCtxt};
-use rustc_ast::CRATE_NODE_ID;
+use rustc_ast::NodeId;
 use rustc_attr::{self as attr, ConstStability, Deprecation, Stability};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_errors::{Applicability, DiagnosticBuilder};
@@ -211,13 +211,14 @@ pub fn early_report_deprecation(
     suggestion: Option<Symbol>,
     lint: &'static Lint,
     span: Span,
+    node_id: NodeId,
 ) {
     if span.in_derive_expansion() {
         return;
     }
 
     let diag = BuiltinLintDiagnostics::DeprecatedMacro(suggestion, span);
-    lint_buffer.buffer_lint_with_diagnostic(lint, CRATE_NODE_ID, span, message, diag);
+    lint_buffer.buffer_lint_with_diagnostic(lint, node_id, span, message, diag);
 }
 
 fn late_report_deprecation(

compiler/rustc_middle/src/mir/visit.rs

@@ -1,70 +1,70 @@
+//! # The MIR Visitor
+//!
+//! ## Overview
+//!
+//! There are two visitors, one for immutable and one for mutable references,
+//! but both are generated by the following macro. The code is written according
+//! to the following conventions:
+//!
+//! - introduce a `visit_foo` and a `super_foo` method for every MIR type
+//! - `visit_foo`, by default, calls `super_foo`
+//! - `super_foo`, by default, destructures the `foo` and calls `visit_foo`
+//!
+//! This allows you as a user to override `visit_foo` for types are
+//! interested in, and invoke (within that method) call
+//! `self.super_foo` to get the default behavior. Just as in an OO
+//! language, you should never call `super` methods ordinarily except
+//! in that circumstance.
+//!
+//! For the most part, we do not destructure things external to the
+//! MIR, e.g., types, spans, etc, but simply visit them and stop. This
+//! avoids duplication with other visitors like `TypeFoldable`.
+//!
+//! ## Updating
+//!
+//! The code is written in a very deliberate style intended to minimize
+//! the chance of things being overlooked. You'll notice that we always
+//! use pattern matching to reference fields and we ensure that all
+//! matches are exhaustive.
+//!
+//! For example, the `super_basic_block_data` method begins like this:
+//!
+//! ```rust
+//! fn super_basic_block_data(&mut self,
+//!                           block: BasicBlock,
+//!                           data: & $($mutability)? BasicBlockData<'tcx>) {
+//!     let BasicBlockData {
+//!         statements,
+//!         terminator,
+//!         is_cleanup: _
+//!     } = *data;
+//!
+//!     for statement in statements {
+//!         self.visit_statement(block, statement);
+//!     }
+//!
+//!     ...
+//! }
+//! ```
+//!
+//! Here we used `let BasicBlockData { <fields> } = *data` deliberately,
+//! rather than writing `data.statements` in the body. This is because if one
+//! adds a new field to `BasicBlockData`, one will be forced to revise this code,
+//! and hence one will (hopefully) invoke the correct visit methods (if any).
+//!
+//! For this to work, ALL MATCHES MUST BE EXHAUSTIVE IN FIELDS AND VARIANTS.
+//! That means you never write `..` to skip over fields, nor do you write `_`
+//! to skip over variants in a `match`.
+//!
+//! The only place that `_` is acceptable is to match a field (or
+//! variant argument) that does not require visiting, as in
+//! `is_cleanup` above.
+
 use crate::mir::*;
 use crate::ty::subst::SubstsRef;
 use crate::ty::{CanonicalUserTypeAnnotation, Ty};
 use rustc_span::Span;
 
-// # The MIR Visitor
-//
-// ## Overview
-//
-// There are two visitors, one for immutable and one for mutable references,
-// but both are generated by the following macro. The code is written according
-// to the following conventions:
-//
-// - introduce a `visit_foo` and a `super_foo` method for every MIR type
-// - `visit_foo`, by default, calls `super_foo`
-// - `super_foo`, by default, destructures the `foo` and calls `visit_foo`
-//
-// This allows you as a user to override `visit_foo` for types are
-// interested in, and invoke (within that method) call
-// `self.super_foo` to get the default behavior. Just as in an OO
-// language, you should never call `super` methods ordinarily except
-// in that circumstance.
-//
-// For the most part, we do not destructure things external to the
-// MIR, e.g., types, spans, etc, but simply visit them and stop. This
-// avoids duplication with other visitors like `TypeFoldable`.
-//
-// ## Updating
-//
-// The code is written in a very deliberate style intended to minimize
-// the chance of things being overlooked. You'll notice that we always
-// use pattern matching to reference fields and we ensure that all
-// matches are exhaustive.
-//
-// For example, the `super_basic_block_data` method begins like this:
-//
-// ```rust
-// fn super_basic_block_data(&mut self,
-//                           block: BasicBlock,
-//                           data: & $($mutability)? BasicBlockData<'tcx>) {
-//     let BasicBlockData {
-//         statements,
-//         terminator,
-//         is_cleanup: _
-//     } = *data;
-//
-//     for statement in statements {
-//         self.visit_statement(block, statement);
-//     }
-//
-//     ...
-// }
-// ```
-//
-// Here we used `let BasicBlockData { <fields> } = *data` deliberately,
-// rather than writing `data.statements` in the body. This is because if one
-// adds a new field to `BasicBlockData`, one will be forced to revise this code,
-// and hence one will (hopefully) invoke the correct visit methods (if any).
-//
-// For this to work, ALL MATCHES MUST BE EXHAUSTIVE IN FIELDS AND VARIANTS.
-// That means you never write `..` to skip over fields, nor do you write `_`
-// to skip over variants in a `match`.
-//
-// The only place that `_` is acceptable is to match a field (or
-// variant argument) that does not require visiting, as in
-// `is_cleanup` above.
-
 macro_rules! make_mir_visitor {
     ($visitor_trait_name:ident, $($mutability:ident)?) => {
         pub trait $visitor_trait_name<'tcx> {

compiler/rustc_middle/src/ty/layout.rs

@@ -176,7 +176,7 @@ impl<'tcx> fmt::Display for LayoutError<'tcx> {
         match *self {
             LayoutError::Unknown(ty) => write!(f, "the type `{}` has an unknown layout", ty),
             LayoutError::SizeOverflow(ty) => {
-                write!(f, "the type `{}` is too big for the current architecture", ty)
+                write!(f, "values of the type `{}` are too big for the current architecture", ty)
             }
         }
     }

compiler/rustc_resolve/src/macros.rs

@@ -1034,6 +1034,7 @@ impl<'a> Resolver<'a> {
                 depr.suggestion,
                 lint,
                 span,
+                node_id,
             );
         }
     }

compiler/rustc_trait_selection/src/traits/query/normalize.rs

@@ -97,6 +97,7 @@ impl<'cx, 'tcx> TypeFolder<'tcx> for QueryNormalizer<'cx, 'tcx> {
         self.infcx.tcx
     }
 
+    #[instrument(skip(self))]
     fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> {
         if !ty.has_projections() {
             return ty;

library/core/src/lib.rs

@@ -80,6 +80,7 @@
 #![feature(const_mut_refs)]
 #![feature(const_int_pow)]
 #![feature(constctlz)]
+#![feature(const_cttz)]
 #![feature(const_panic)]
 #![feature(const_pin)]
 #![feature(const_fn)]

library/core/src/num/nonzero.rs

@@ -6,6 +6,7 @@ use crate::str::FromStr;
 
 use super::from_str_radix;
 use super::{IntErrorKind, ParseIntError};
+use crate::intrinsics;
 
 macro_rules! doc_comment {
     ($x:expr, $($tt:tt)*) => {
@@ -189,3 +190,76 @@ macro_rules! from_str_radix_nzint_impl {
 
 from_str_radix_nzint_impl! { NonZeroU8 NonZeroU16 NonZeroU32 NonZeroU64 NonZeroU128 NonZeroUsize
 NonZeroI8 NonZeroI16 NonZeroI32 NonZeroI64 NonZeroI128 NonZeroIsize }
+
+macro_rules! nonzero_leading_trailing_zeros {
+    ( $( $Ty: ident($Uint: ty) , $LeadingTestExpr:expr ;)+ ) => {
+        $(
+            impl $Ty {
+                doc_comment! {
+                    concat!("Returns the number of leading zeros in the binary representation of `self`.
+
+On many architectures, this function can perform better than `leading_zeros()` on the underlying integer type, as special handling of zero can be avoided.
+
+# Examples
+
+Basic usage:
+
+```
+#![feature(nonzero_leading_trailing_zeros)]
+let n = std::num::", stringify!($Ty), "::new(", stringify!($LeadingTestExpr), ").unwrap();
+
+assert_eq!(n.leading_zeros(), 0);
+```"),
+                    #[unstable(feature = "nonzero_leading_trailing_zeros", issue = "79143")]
+                    #[rustc_const_unstable(feature = "nonzero_leading_trailing_zeros", issue = "79143")]
+                    #[inline]
+                    pub const fn leading_zeros(self) -> u32 {
+                        // SAFETY: since `self` can not be zero it is safe to call ctlz_nonzero
+                        unsafe { intrinsics::ctlz_nonzero(self.0 as $Uint) as u32 }
+                    }
+                }
+
+                doc_comment! {
+                    concat!("Returns the number of trailing zeros in the binary representation
+of `self`.
+
+On many architectures, this function can perform better than `trailing_zeros()` on the underlying integer type, as special handling of zero can be avoided.
+
+# Examples
+
+Basic usage:
+
+```
+#![feature(nonzero_leading_trailing_zeros)]
+let n = std::num::", stringify!($Ty), "::new(0b0101000).unwrap();
+
+assert_eq!(n.trailing_zeros(), 3);
+```"),
+                    #[unstable(feature = "nonzero_leading_trailing_zeros", issue = "79143")]
+                    #[rustc_const_unstable(feature = "nonzero_leading_trailing_zeros", issue = "79143")]
+                    #[inline]
+                    pub const fn trailing_zeros(self) -> u32 {
+                        // SAFETY: since `self` can not be zero it is safe to call cttz_nonzero
+                        unsafe { intrinsics::cttz_nonzero(self.0 as $Uint) as u32 }
+                    }
+                }
+
+            }
+        )+
+    }
+}
+
+nonzero_leading_trailing_zeros! {
+    NonZeroU8(u8), u8::MAX;
+    NonZeroU16(u16), u16::MAX;
+    NonZeroU32(u32), u32::MAX;
+    NonZeroU64(u64), u64::MAX;
+    NonZeroU128(u128), u128::MAX;
+    NonZeroUsize(usize), usize::MAX;
+    NonZeroI8(u8), -1i8;
+    NonZeroI16(u16), -1i16;
+    NonZeroI32(u32), -1i32;
+    NonZeroI64(u64), -1i64;
+    NonZeroI128(u128), -1i128;
+    NonZeroIsize(usize), -1isize;
+}

library/core/tests/lib.rs

@@ -60,6 +60,8 @@
 #![feature(once_cell)]
 #![feature(unsafe_block_in_unsafe_fn)]
 #![feature(int_bits_const)]
+#![feature(nonzero_leading_trailing_zeros)]
+#![feature(const_option)]
 #![deny(unsafe_op_in_unsafe_fn)]
 
 extern crate test;