Auto merge of #119760 - matthiaskrgr:rollup-ti2xpp7, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - #117744 (Add -Zuse-sync-unwind)
 - #118649 (Make inductive cycles in coherence ambiguous always)
 - #118979 (Use `assert_unsafe_precondition` for `char::from_u32_unchecked`)
 - #119619 (mir-opt and custom target fixes)
 - #119632 (Fix broken build for ESP IDF due to #119026)
 - #119712 (Adding alignment to the cases to test for specific error messages.)
 - #119734 (Miri subtree update)

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

Author: bors

Cargo.lock

@@ -2465,6 +2465,7 @@ dependencies = [
  "ctrlc",
  "env_logger",
  "getrandom",
+ "jemalloc-sys",
  "lazy_static",
  "libc",
  "libffi",
@@ -2474,7 +2475,6 @@ dependencies = [
  "rand",
  "regex",
  "rustc_version",
- "serde",
  "smallvec",
  "ui_test",
 ]
@@ -3280,9 +3280,9 @@ dependencies = [
 
 [[package]]
 name = "rustc-build-sysroot"
-version = "0.4.2"
+version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ed2a90dfa5232ed5ff21d53d4df655f315ab316ea06fc508f1c74bcedb1ce6c"
+checksum = "39dcf8d82b1f79a179bdb284dc44db440a9666eefa5a6df5ef282d6db930d544"
 dependencies = [
  "anyhow",
  "rustc_version",

compiler/rustc_codegen_llvm/src/allocator.rs

@@ -134,7 +134,8 @@ fn create_wrapper_function(
             llvm::LLVMRustSetVisibility(llfn, llvm::Visibility::Hidden);
         }
         if tcx.sess.must_emit_unwind_tables() {
-            let uwtable = attributes::uwtable_attr(llcx);
+            let uwtable =
+                attributes::uwtable_attr(llcx, tcx.sess.opts.unstable_opts.use_sync_unwind);
             attributes::apply_to_llfn(llfn, llvm::AttributePlace::Function, &[uwtable]);
         }
 

compiler/rustc_codegen_llvm/src/attributes.rs

@@ -95,11 +95,12 @@ pub fn sanitize_attrs<'ll>(
 
 /// Tell LLVM to emit or not emit the information necessary to unwind the stack for the function.
 #[inline]
-pub fn uwtable_attr(llcx: &llvm::Context) -> &Attribute {
+pub fn uwtable_attr(llcx: &llvm::Context, use_sync_unwind: Option<bool>) -> &Attribute {
     // NOTE: We should determine if we even need async unwind tables, as they
     // take have more overhead and if we can use sync unwind tables we
     // probably should.
-    llvm::CreateUWTableAttr(llcx, true)
+    let async_unwind = !use_sync_unwind.unwrap_or(false);
+    llvm::CreateUWTableAttr(llcx, async_unwind)
 }
 
 pub fn frame_pointer_type_attr<'ll>(cx: &CodegenCx<'ll, '_>) -> Option<&'ll Attribute> {
@@ -333,7 +334,7 @@ pub fn from_fn_attrs<'ll, 'tcx>(
     // You can also find more info on why Windows always requires uwtables here:
     //      https://bugzilla.mozilla.org/show_bug.cgi?id=1302078
     if cx.sess().must_emit_unwind_tables() {
-        to_add.push(uwtable_attr(cx.llcx));
+        to_add.push(uwtable_attr(cx.llcx, cx.sess().opts.unstable_opts.use_sync_unwind));
     }
 
     if cx.sess().opts.unstable_opts.profile_sample_use.is_some() {

compiler/rustc_lint/src/lib.rs

@@ -513,6 +513,11 @@ fn register_builtins(store: &mut LintStore) {
         "converted into hard error, see PR #117984 \
         <https://github.com/rust-lang/rust/pull/117984> for more information",
     );
+    store.register_removed(
+        "coinductive_overlap_in_coherence",
+        "converted into hard error, see PR #118649 \
+         <https://github.com/rust-lang/rust/pull/118649> for more information",
+    );
 }
 
 fn register_internals(store: &mut LintStore) {

compiler/rustc_lint_defs/src/builtin.rs

@@ -26,7 +26,6 @@ declare_lint_pass! {
         BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE,
         CENUM_IMPL_DROP_CAST,
         COHERENCE_LEAK_CHECK,
-        COINDUCTIVE_OVERLAP_IN_COHERENCE,
         CONFLICTING_REPR_HINTS,
         CONST_EVALUATABLE_UNCHECKED,
         CONST_ITEM_MUTATION,
@@ -4367,45 +4366,6 @@ declare_lint! {
     @feature_gate = sym::type_privacy_lints;
 }
 
-declare_lint! {
-    /// The `coinductive_overlap_in_coherence` lint detects impls which are currently
-    /// considered not overlapping, but may be considered to overlap if support for
-    /// coinduction is added to the trait solver.
-    ///
-    /// ### Example
-    ///
-    /// ```rust,compile_fail
-    /// #![deny(coinductive_overlap_in_coherence)]
-    ///
-    /// trait CyclicTrait {}
-    /// impl<T: CyclicTrait> CyclicTrait for T {}
-    ///
-    /// trait Trait {}
-    /// impl<T: CyclicTrait> Trait for T {}
-    /// // conflicting impl with the above
-    /// impl Trait for u8 {}
-    /// ```
-    ///
-    /// {{produces}}
-    ///
-    /// ### Explanation
-    ///
-    /// We have two choices for impl which satisfy `u8: Trait`: the blanket impl
-    /// for generic `T`, and the direct impl for `u8`. These two impls nominally
-    /// overlap, since we can infer `T = u8` in the former impl, but since the where
-    /// clause `u8: CyclicTrait` would end up resulting in a cycle (since it depends
-    /// on itself), the blanket impl is not considered to hold for `u8`. This will
-    /// change in a future release.
-    pub COINDUCTIVE_OVERLAP_IN_COHERENCE,
-    Deny,
-    "impls that are not considered to overlap may be considered to \
-    overlap in the future",
-    @future_incompatible = FutureIncompatibleInfo {
-        reason: FutureIncompatibilityReason::FutureReleaseErrorReportInDeps,
-        reference: "issue #114040 <https://github.com/rust-lang/rust/issues/114040>",
-    };
-}
-
 declare_lint! {
     /// The `unknown_or_malformed_diagnostic_attributes` lint detects unrecognized or otherwise malformed
     /// diagnostic attributes.

compiler/rustc_parse_format/src/lib.rs

@@ -289,10 +289,10 @@ impl<'a> Iterator for Parser<'a> {
                             }
                         } else {
                             if let Some(&(_, maybe)) = self.cur.peek() {
-                                if maybe == '?' {
-                                    self.suggest_format();
-                                } else {
-                                    self.suggest_positional_arg_instead_of_captured_arg(arg);
+                                match maybe {
+                                    '?' => self.suggest_format_debug(),
+                                    '<' | '^' | '>' => self.suggest_format_align(maybe),
+                                    _ => self.suggest_positional_arg_instead_of_captured_arg(arg),
                                 }
                             }
                         }
@@ -868,10 +868,9 @@ impl<'a> Parser<'a> {
         found.then_some(cur)
     }
 
-    fn suggest_format(&mut self) {
+    fn suggest_format_debug(&mut self) {
         if let (Some(pos), Some(_)) = (self.consume_pos('?'), self.consume_pos(':')) {
             let word = self.word();
-            let _end = self.current_pos();
             let pos = self.to_span_index(pos);
             self.errors.insert(
                 0,
@@ -887,6 +886,23 @@ impl<'a> Parser<'a> {
         }
     }
 
+    fn suggest_format_align(&mut self, alignment: char) {
+        if let Some(pos) = self.consume_pos(alignment) {
+            let pos = self.to_span_index(pos);
+            self.errors.insert(
+                0,
+                ParseError {
+                    description: "expected format parameter to occur after `:`".to_owned(),
+                    note: None,
+                    label: format!("expected `{}` to occur after `:`", alignment).to_owned(),
+                    span: pos.to(pos),
+                    secondary_label: None,
+                    suggestion: Suggestion::None,
+                },
+            );
+        }
+    }
+
     fn suggest_positional_arg_instead_of_captured_arg(&mut self, arg: Argument<'a>) {
         if let Some(end) = self.consume_pos('.') {
             let byte_pos = self.to_span_index(end);

compiler/rustc_session/src/options.rs

@@ -1960,6 +1960,8 @@ written to standard error output)"),
         "adds unstable command line options to rustc interface (default: no)"),
     use_ctors_section: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "use legacy .ctors section for initializers rather than .init_array"),
+    use_sync_unwind: Option<bool> = (None, parse_opt_bool, [TRACKED],
+        "Generate sync unwind tables instead of async unwind tables (default: no)"),
     validate_mir: bool = (false, parse_bool, [UNTRACKED],
         "validate MIR after each transformation"),
     #[rustc_lint_opt_deny_field_access("use `Session::verbose_internals` instead of this field")]

compiler/rustc_trait_selection/src/traits/coherence.rs

@@ -10,7 +10,7 @@ use crate::solve::inspect::{InspectGoal, ProofTreeInferCtxtExt, ProofTreeVisitor
 use crate::solve::{deeply_normalize_for_diagnostics, inspect};
 use crate::traits::engine::TraitEngineExt;
 use crate::traits::query::evaluate_obligation::InferCtxtExt;
-use crate::traits::select::{IntercrateAmbiguityCause, TreatInductiveCycleAs};
+use crate::traits::select::IntercrateAmbiguityCause;
 use crate::traits::structural_normalize::StructurallyNormalizeExt;
 use crate::traits::NormalizeExt;
 use crate::traits::SkipLeakCheck;
@@ -31,7 +31,6 @@ use rustc_middle::traits::DefiningAnchor;
 use rustc_middle::ty::fast_reject::{DeepRejectCtxt, TreatParams};
 use rustc_middle::ty::visit::{TypeVisitable, TypeVisitableExt};
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeSuperVisitable, TypeVisitor};
-use rustc_session::lint::builtin::COINDUCTIVE_OVERLAP_IN_COHERENCE;
 use rustc_span::symbol::sym;
 use rustc_span::DUMMY_SP;
 use std::fmt::Debug;
@@ -197,7 +196,7 @@ fn overlap<'tcx>(
         .intercrate(true)
         .with_next_trait_solver(tcx.next_trait_solver_in_coherence())
         .build();
-    let selcx = &mut SelectionContext::new(&infcx);
+    let selcx = &mut SelectionContext::with_treat_inductive_cycle_as_ambig(&infcx);
     if track_ambiguity_causes.is_yes() {
         selcx.enable_tracking_intercrate_ambiguity_causes();
     }
@@ -224,61 +223,10 @@ fn overlap<'tcx>(
     );
 
     if overlap_mode.use_implicit_negative() {
-        for mode in [TreatInductiveCycleAs::Ambig, TreatInductiveCycleAs::Recur] {
-            if let Some(failing_obligation) = selcx.with_treat_inductive_cycle_as(mode, |selcx| {
-                impl_intersection_has_impossible_obligation(selcx, &obligations)
-            }) {
-                if matches!(mode, TreatInductiveCycleAs::Recur) {
-                    let first_local_impl = impl1_header
-                        .impl_def_id
-                        .as_local()
-                        .or(impl2_header.impl_def_id.as_local())
-                        .expect("expected one of the impls to be local");
-                    infcx.tcx.struct_span_lint_hir(
-                        COINDUCTIVE_OVERLAP_IN_COHERENCE,
-                        infcx.tcx.local_def_id_to_hir_id(first_local_impl),
-                        infcx.tcx.def_span(first_local_impl),
-                        format!(
-                            "implementations {} will conflict in the future",
-                            match impl1_header.trait_ref {
-                                Some(trait_ref) => {
-                                    let trait_ref = infcx.resolve_vars_if_possible(trait_ref);
-                                    format!(
-                                        "of `{}` for `{}`",
-                                        trait_ref.print_trait_sugared(),
-                                        trait_ref.self_ty()
-                                    )
-                                }
-                                None => format!(
-                                    "for `{}`",
-                                    infcx.resolve_vars_if_possible(impl1_header.self_ty)
-                                ),
-                            },
-                        ),
-                        |lint| {
-                            lint.note(
-                                "impls that are not considered to overlap may be considered to \
-                                overlap in the future",
-                            )
-                            .span_label(
-                                infcx.tcx.def_span(impl1_header.impl_def_id),
-                                "the first impl is here",
-                            )
-                            .span_label(
-                                infcx.tcx.def_span(impl2_header.impl_def_id),
-                                "the second impl is here",
-                            );
-                            lint.note(format!(
-                                "`{}` may be considered to hold in future releases, \
-                                    causing the impls to overlap",
-                                infcx.resolve_vars_if_possible(failing_obligation.predicate)
-                            ));
-                        },
-                    );
-                }
-
-                return None;
-            }
+        if let Some(_failing_obligation) =
+            impl_intersection_has_impossible_obligation(selcx, &obligations)
+        {
+            return None;
         }
     }
 

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

@@ -239,20 +239,16 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         }
     }
 
-    // Sets the `TreatInductiveCycleAs` mode temporarily in the selection context
-    pub fn with_treat_inductive_cycle_as<T>(
-        &mut self,
-        treat_inductive_cycle: TreatInductiveCycleAs,
-        f: impl FnOnce(&mut Self) -> T,
-    ) -> T {
+    pub fn with_treat_inductive_cycle_as_ambig(
+        infcx: &'cx InferCtxt<'tcx>,
+    ) -> SelectionContext<'cx, 'tcx> {
         // Should be executed in a context where caching is disabled,
         // otherwise the cache is poisoned with the temporary result.
-        assert!(self.is_intercrate());
-        let treat_inductive_cycle =
-            std::mem::replace(&mut self.treat_inductive_cycle, treat_inductive_cycle);
-        let value = f(self);
-        self.treat_inductive_cycle = treat_inductive_cycle;
-        value
+        assert!(infcx.intercrate);
+        SelectionContext {
+            treat_inductive_cycle: TreatInductiveCycleAs::Ambig,
+            ..SelectionContext::new(infcx)
+        }
     }
 
     pub fn with_query_mode(

library/core/src/char/convert.rs

@@ -4,6 +4,7 @@ use crate::char::TryFromCharError;
 use crate::convert::TryFrom;
 use crate::error::Error;
 use crate::fmt;
+use crate::intrinsics::assert_unsafe_precondition;
 use crate::mem::transmute;
 use crate::str::FromStr;
 
@@ -23,7 +24,13 @@ pub(super) const fn from_u32(i: u32) -> Option<char> {
 #[must_use]
 pub(super) const unsafe fn from_u32_unchecked(i: u32) -> char {
     // SAFETY: the caller must guarantee that `i` is a valid char value.
-    if cfg!(debug_assertions) { char::from_u32(i).unwrap() } else { unsafe { transmute(i) } }
+    unsafe {
+        assert_unsafe_precondition!(
+            "invalid value for `char`",
+            (i: u32) => char_try_from_u32(i).is_ok()
+        );
+        transmute(i)
+    }
 }
 
 #[stable(feature = "char_convert", since = "1.13.0")]