Auto merge of rust-lang#123385 - matthiaskrgr:rollup-v69vjbn, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#123198 (Add fn const BuildHasherDefault::new)
 - rust-lang#123226 (De-LLVM the unchecked shifts [MCP#693])
 - rust-lang#123302 (Make sure to insert `Sized` bound first into clauses list)
 - rust-lang#123348 (rustdoc: add a couple of regression tests)
 - rust-lang#123362 (Check that nested statics in thread locals are duplicated per thread.)
 - rust-lang#123368 (CFI: Support non-general coroutines)
 - rust-lang#123375 (rustdoc: synthetic auto trait impls: accept unresolved region vars for now)
 - rust-lang#123378 (Update sysinfo to 0.30.8)

Failed merges:

 - rust-lang#123349 (Fix capture analysis for by-move closure bodies)

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

Author: bors

Cargo.lock

@@ -5370,9 +5370,9 @@ dependencies = [
 
 [[package]]
 name = "sysinfo"
-version = "0.30.7"
+version = "0.30.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c385888ef380a852a16209afc8cfad22795dd8873d69c9a14d2e2088f118d18"
+checksum = "4b1a378e48fb3ce3a5cf04359c456c9c98ff689bcf1c1bc6e6a31f247686f275"
 dependencies = [
  "cfg-if",
  "core-foundation-sys",

compiler/rustc_codegen_ssa/src/base.rs

@@ -5,7 +5,7 @@ use crate::back::write::{
     compute_per_cgu_lto_type, start_async_codegen, submit_codegened_module_to_llvm,
     submit_post_lto_module_to_llvm, submit_pre_lto_module_to_llvm, ComputedLtoType, OngoingCodegen,
 };
-use crate::common::{IntPredicate, RealPredicate, TypeKind};
+use crate::common::{self, IntPredicate, RealPredicate, TypeKind};
 use crate::errors;
 use crate::meth;
 use crate::mir;
@@ -33,7 +33,7 @@ use rustc_middle::mir::mono::{CodegenUnit, CodegenUnitNameBuilder, MonoItem};
 use rustc_middle::query::Providers;
 use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf, TyAndLayout};
 use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
-use rustc_session::config::{self, CrateType, EntryFnType, OutputType};
+use rustc_session::config::{self, CrateType, EntryFnType, OptLevel, OutputType};
 use rustc_session::Session;
 use rustc_span::symbol::sym;
 use rustc_span::Symbol;
@@ -300,14 +300,35 @@ pub fn coerce_unsized_into<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     }
 }
 
-pub fn cast_shift_expr_rhs<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
+/// Returns `rhs` sufficiently masked, truncated, and/or extended so that
+/// it can be used to shift `lhs`.
+///
+/// Shifts in MIR are all allowed to have mismatched LHS & RHS types.
+/// The shift methods in `BuilderMethods`, however, are fully homogeneous
+/// (both parameters and the return type are all the same type).
+///
+/// If `is_unchecked` is false, this masks the RHS to ensure it stays in-bounds,
+/// as the `BuilderMethods` shifts are UB for out-of-bounds shift amounts.
+/// For 32- and 64-bit types, this matches the semantics
+/// of Java. (See related discussion on #1877 and #10183.)
+///
+/// If `is_unchecked` is true, this does no masking, and adds sufficient `assume`
+/// calls or operation flags to preserve as much freedom to optimize as possible.
+pub fn build_shift_expr_rhs<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     bx: &mut Bx,
     lhs: Bx::Value,
-    rhs: Bx::Value,
+    mut rhs: Bx::Value,
+    is_unchecked: bool,
 ) -> Bx::Value {
     // Shifts may have any size int on the rhs
     let mut rhs_llty = bx.cx().val_ty(rhs);
     let mut lhs_llty = bx.cx().val_ty(lhs);
+
+    let mask = common::shift_mask_val(bx, lhs_llty, rhs_llty, false);
+    if !is_unchecked {
+        rhs = bx.and(rhs, mask);
+    }
+
     if bx.cx().type_kind(rhs_llty) == TypeKind::Vector {
         rhs_llty = bx.cx().element_type(rhs_llty)
     }
@@ -317,6 +338,12 @@ pub fn cast_shift_expr_rhs<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     let rhs_sz = bx.cx().int_width(rhs_llty);
     let lhs_sz = bx.cx().int_width(lhs_llty);
     if lhs_sz < rhs_sz {
+        if is_unchecked && bx.sess().opts.optimize != OptLevel::No {
+            // FIXME: Use `trunc nuw` once that's available
+            let inrange = bx.icmp(IntPredicate::IntULE, rhs, mask);
+            bx.assume(inrange);
+        }
+
         bx.trunc(rhs, lhs_llty)
     } else if lhs_sz > rhs_sz {
         // We zero-extend even if the RHS is signed. So e.g. `(x: i32) << -1i8` will zero-extend the

compiler/rustc_codegen_ssa/src/common.rs

@@ -3,10 +3,9 @@
 use rustc_hir::LangItem;
 use rustc_middle::mir;
 use rustc_middle::ty::Instance;
-use rustc_middle::ty::{self, layout::TyAndLayout, Ty, TyCtxt};
+use rustc_middle::ty::{self, layout::TyAndLayout, TyCtxt};
 use rustc_span::Span;
 
-use crate::base;
 use crate::traits::*;
 
 #[derive(Copy, Clone)]
@@ -128,44 +127,6 @@ pub fn build_langcall<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     (bx.fn_abi_of_instance(instance, ty::List::empty()), bx.get_fn_addr(instance), instance)
 }
 
-// To avoid UB from LLVM, these two functions mask RHS with an
-// appropriate mask unconditionally (i.e., the fallback behavior for
-// all shifts). For 32- and 64-bit types, this matches the semantics
-// of Java. (See related discussion on #1877 and #10183.)
-
-pub fn build_masked_lshift<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
-    bx: &mut Bx,
-    lhs: Bx::Value,
-    rhs: Bx::Value,
-) -> Bx::Value {
-    let rhs = base::cast_shift_expr_rhs(bx, lhs, rhs);
-    // #1877, #10183: Ensure that input is always valid
-    let rhs = shift_mask_rhs(bx, rhs);
-    bx.shl(lhs, rhs)
-}
-
-pub fn build_masked_rshift<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
-    bx: &mut Bx,
-    lhs_t: Ty<'tcx>,
-    lhs: Bx::Value,
-    rhs: Bx::Value,
-) -> Bx::Value {
-    let rhs = base::cast_shift_expr_rhs(bx, lhs, rhs);
-    // #1877, #10183: Ensure that input is always valid
-    let rhs = shift_mask_rhs(bx, rhs);
-    let is_signed = lhs_t.is_signed();
-    if is_signed { bx.ashr(lhs, rhs) } else { bx.lshr(lhs, rhs) }
-}
-
-fn shift_mask_rhs<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
-    bx: &mut Bx,
-    rhs: Bx::Value,
-) -> Bx::Value {
-    let rhs_llty = bx.val_ty(rhs);
-    let shift_val = shift_mask_val(bx, rhs_llty, rhs_llty, false);
-    bx.and(rhs, shift_val)
-}
-
 pub fn shift_mask_val<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     bx: &mut Bx,
     llty: Bx::Type,

compiler/rustc_codegen_ssa/src/mir/rvalue.rs

@@ -3,7 +3,7 @@ use super::place::PlaceRef;
 use super::{FunctionCx, LocalRef};
 
 use crate::base;
-use crate::common::{self, IntPredicate};
+use crate::common::IntPredicate;
 use crate::traits::*;
 use crate::MemFlags;
 
@@ -861,14 +861,12 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                     bx.inbounds_gep(llty, lhs, &[rhs])
                 }
             }
-            mir::BinOp::Shl => common::build_masked_lshift(bx, lhs, rhs),
-            mir::BinOp::ShlUnchecked => {
-                let rhs = base::cast_shift_expr_rhs(bx, lhs, rhs);
+            mir::BinOp::Shl | mir::BinOp::ShlUnchecked => {
+                let rhs = base::build_shift_expr_rhs(bx, lhs, rhs, op == mir::BinOp::ShlUnchecked);
                 bx.shl(lhs, rhs)
             }
-            mir::BinOp::Shr => common::build_masked_rshift(bx, input_ty, lhs, rhs),
-            mir::BinOp::ShrUnchecked => {
-                let rhs = base::cast_shift_expr_rhs(bx, lhs, rhs);
+            mir::BinOp::Shr | mir::BinOp::ShrUnchecked => {
+                let rhs = base::build_shift_expr_rhs(bx, lhs, rhs, op == mir::BinOp::ShrUnchecked);
                 if is_signed { bx.ashr(lhs, rhs) } else { bx.lshr(lhs, rhs) }
             }
             mir::BinOp::Ne

compiler/rustc_const_eval/messages.ftl

@@ -222,6 +222,7 @@ const_eval_mut_deref =
 
 const_eval_mutable_ptr_in_final = encountered mutable pointer in final value of {const_eval_intern_kind}
 
+const_eval_nested_static_in_thread_local = #[thread_local] does not support implicit nested statics, please create explicit static items and refer to them instead
 const_eval_non_const_fmt_macro_call =
     cannot call non-const formatting macro in {const_eval_const_context}s
 

compiler/rustc_const_eval/src/errors.rs

@@ -25,6 +25,13 @@ pub(crate) struct DanglingPtrInFinal {
     pub kind: InternKind,
 }
 
+#[derive(Diagnostic)]
+#[diag(const_eval_nested_static_in_thread_local)]
+pub(crate) struct NestedStaticInThreadLocal {
+    #[primary_span]
+    pub span: Span,
+}
+
 #[derive(LintDiagnostic)]
 #[diag(const_eval_mutable_ptr_in_final)]
 pub(crate) struct MutablePtrInFinal {

compiler/rustc_const_eval/src/interpret/intern.rs

@@ -28,7 +28,7 @@ use rustc_span::sym;
 
 use super::{AllocId, Allocation, InterpCx, MPlaceTy, Machine, MemoryKind, PlaceTy};
 use crate::const_eval;
-use crate::errors::{DanglingPtrInFinal, MutablePtrInFinal};
+use crate::errors::{DanglingPtrInFinal, MutablePtrInFinal, NestedStaticInThreadLocal};
 
 pub trait CompileTimeMachine<'mir, 'tcx: 'mir, T> = Machine<
         'mir,
@@ -108,6 +108,10 @@ fn intern_as_new_static<'tcx>(
     );
     tcx.set_nested_alloc_id_static(alloc_id, feed.def_id());
 
+    if tcx.is_thread_local_static(static_id.into()) {
+        tcx.dcx().emit_err(NestedStaticInThreadLocal { span: tcx.def_span(static_id) });
+    }
+
     // These do not inherit the codegen attrs of the parent static allocation, since
     // it doesn't make sense for them to inherit their `#[no_mangle]` and `#[link_name = ..]`
     // and the like.

compiler/rustc_hir_analysis/src/bounds.rs

@@ -54,14 +54,20 @@ impl<'tcx> Bounds<'tcx> {
         span: Span,
         polarity: ty::PredicatePolarity,
     ) {
-        self.clauses.push((
+        let clause = (
             trait_ref
                 .map_bound(|trait_ref| {
                     ty::ClauseKind::Trait(ty::TraitPredicate { trait_ref, polarity })
                 })
                 .to_predicate(tcx),
             span,
-        ));
+        );
+        // FIXME(-Znext-solver): We can likely remove this hack once the new trait solver lands.
+        if tcx.lang_items().sized_trait() == Some(trait_ref.def_id()) {
+            self.clauses.insert(0, clause);
+        } else {
+            self.clauses.push(clause);
+        }
     }
 
     pub fn push_projection_bound(

compiler/rustc_hir_analysis/src/check/intrinsic.rs

@@ -459,9 +459,8 @@ pub fn check_intrinsic_type(
             sym::unchecked_div | sym::unchecked_rem | sym::exact_div => {
                 (1, 0, vec![param(0), param(0)], param(0))
             }
-            sym::unchecked_shl | sym::unchecked_shr | sym::rotate_left | sym::rotate_right => {
-                (1, 0, vec![param(0), param(0)], param(0))
-            }
+            sym::unchecked_shl | sym::unchecked_shr => (2, 0, vec![param(0), param(1)], param(0)),
+            sym::rotate_left | sym::rotate_right => (1, 0, vec![param(0), param(0)], param(0)),
             sym::unchecked_add | sym::unchecked_sub | sym::unchecked_mul => {
                 (1, 0, vec![param(0), param(0)], param(0))
             }

compiler/rustc_symbol_mangling/src/typeid/typeid_itanium_cxx_abi.rs

@@ -1218,22 +1218,35 @@ pub fn typeid_for_instance<'tcx>(
                     let trait_id = tcx.fn_trait_kind_to_def_id(closure_args.kind()).unwrap();
                     let tuple_args =
                         tcx.instantiate_bound_regions_with_erased(closure_args.sig()).inputs()[0];
-                    (trait_id, tuple_args)
+                    (trait_id, Some(tuple_args))
                 }
-                ty::Coroutine(..) => (
-                    tcx.require_lang_item(LangItem::Coroutine, None),
-                    instance.args.as_coroutine().resume_ty(),
-                ),
+                ty::Coroutine(..) => match tcx.coroutine_kind(instance.def_id()).unwrap() {
+                    hir::CoroutineKind::Coroutine(..) => (
+                        tcx.require_lang_item(LangItem::Coroutine, None),
+                        Some(instance.args.as_coroutine().resume_ty()),
+                    ),
+                    hir::CoroutineKind::Desugared(desugaring, _) => {
+                        let lang_item = match desugaring {
+                            hir::CoroutineDesugaring::Async => LangItem::Future,
+                            hir::CoroutineDesugaring::AsyncGen => LangItem::AsyncIterator,
+                            hir::CoroutineDesugaring::Gen => LangItem::Iterator,
+                        };
+                        (tcx.require_lang_item(lang_item, None), None)
+                    }
+                },
                 ty::CoroutineClosure(..) => (
                     tcx.require_lang_item(LangItem::FnOnce, None),
-                    tcx.instantiate_bound_regions_with_erased(
-                        instance.args.as_coroutine_closure().coroutine_closure_sig(),
-                    )
-                    .tupled_inputs_ty,
+                    Some(
+                        tcx.instantiate_bound_regions_with_erased(
+                            instance.args.as_coroutine_closure().coroutine_closure_sig(),
+                        )
+                        .tupled_inputs_ty,
+                    ),
                 ),
                 x => bug!("Unexpected type kind for closure-like: {x:?}"),
             };
-            let trait_ref = ty::TraitRef::new(tcx, trait_id, [closure_ty, inputs]);
+            let concrete_args = tcx.mk_args_trait(closure_ty, inputs.map(Into::into));
+            let trait_ref = ty::TraitRef::new(tcx, trait_id, concrete_args);
             let invoke_ty = trait_object_ty(tcx, ty::Binder::dummy(trait_ref));
             let abstract_args = tcx.mk_args_trait(invoke_ty, trait_ref.args.into_iter().skip(1));
             // There should be exactly one method on this trait, and it should be the one we're

library/core/src/hash/mod.rs

@@ -752,6 +752,18 @@ pub trait BuildHasher {
 #[stable(since = "1.7.0", feature = "build_hasher")]
 pub struct BuildHasherDefault<H>(marker::PhantomData<fn() -> H>);
 
+impl<H> BuildHasherDefault<H> {
+    /// Creates a new BuildHasherDefault for Hasher `H`.
+    #[unstable(
+        feature = "build_hasher_default_const_new",
+        issue = "123197",
+        reason = "recently added"
+    )]
+    pub const fn new() -> Self {
+        BuildHasherDefault(marker::PhantomData)
+    }
+}
+
 #[stable(since = "1.9.0", feature = "core_impl_debug")]
 impl<H> fmt::Debug for BuildHasherDefault<H> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -778,7 +790,7 @@ impl<H> Clone for BuildHasherDefault<H> {
 #[stable(since = "1.7.0", feature = "build_hasher")]
 impl<H> Default for BuildHasherDefault<H> {
     fn default() -> BuildHasherDefault<H> {
-        BuildHasherDefault(marker::PhantomData)
+        Self::new()
     }
 }
 

library/core/src/intrinsics.rs

@@ -2236,18 +2236,20 @@ extern "rust-intrinsic" {
     /// Safe wrappers for this intrinsic are available on the integer
     /// primitives via the `checked_shl` method. For example,
     /// [`u32::checked_shl`]
+    #[cfg(not(bootstrap))]
     #[rustc_const_stable(feature = "const_int_unchecked", since = "1.40.0")]
     #[rustc_nounwind]
-    pub fn unchecked_shl<T: Copy>(x: T, y: T) -> T;
+    pub fn unchecked_shl<T: Copy, U: Copy>(x: T, y: U) -> T;
     /// Performs an unchecked right shift, resulting in undefined behavior when
     /// `y < 0` or `y >= N`, where N is the width of T in bits.
     ///
     /// Safe wrappers for this intrinsic are available on the integer
     /// primitives via the `checked_shr` method. For example,
     /// [`u32::checked_shr`]
+    #[cfg(not(bootstrap))]
     #[rustc_const_stable(feature = "const_int_unchecked", since = "1.40.0")]
     #[rustc_nounwind]
-    pub fn unchecked_shr<T: Copy>(x: T, y: T) -> T;
+    pub fn unchecked_shr<T: Copy, U: Copy>(x: T, y: U) -> T;
 
     /// Returns the result of an unchecked addition, resulting in
     /// undefined behavior when `x + y > T::MAX` or `x + y < T::MIN`.

library/core/src/num/int_macros.rs

@@ -1227,10 +1227,18 @@ macro_rules! int_impl {
         #[inline(always)]
         #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_shl(self, rhs: u32) -> Self {
-            // SAFETY: the caller must uphold the safety contract for
-            // `unchecked_shl`.
-            // Any legal shift amount is losslessly representable in the self type.
-            unsafe { intrinsics::unchecked_shl(self, conv_rhs_for_unchecked_shift!($SelfT, rhs)) }
+            #[cfg(bootstrap)]
+            {
+                // For bootstrapping, just use built-in primitive shift.
+                // panicking is a legal manifestation of UB
+                self << rhs
+            }
+            #[cfg(not(bootstrap))]
+            {
+                // SAFETY: the caller must uphold the safety contract for
+                // `unchecked_shl`.
+                unsafe { intrinsics::unchecked_shl(self, rhs) }
+            }
         }
 
         /// Checked shift right. Computes `self >> rhs`, returning `None` if `rhs` is
@@ -1310,10 +1318,18 @@ macro_rules! int_impl {
         #[inline(always)]
         #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_shr(self, rhs: u32) -> Self {
-            // SAFETY: the caller must uphold the safety contract for
-            // `unchecked_shr`.
-            // Any legal shift amount is losslessly representable in the self type.
-            unsafe { intrinsics::unchecked_shr(self, conv_rhs_for_unchecked_shift!($SelfT, rhs)) }
+            #[cfg(bootstrap)]
+            {
+                // For bootstrapping, just use built-in primitive shift.
+                // panicking is a legal manifestation of UB
+                self >> rhs
+            }
+            #[cfg(not(bootstrap))]
+            {
+                // SAFETY: the caller must uphold the safety contract for
+                // `unchecked_shr`.
+                unsafe { intrinsics::unchecked_shr(self, rhs) }
+            }
         }
 
         /// Checked absolute value. Computes `self.abs()`, returning `None` if