Rollup of 11 pull requests

.github/workflows/ci.yml

@@ -315,6 +315,10 @@ jobs:
           - name: x86_64-gnu-distcheck
             os: ubuntu-20.04-8core-32gb
             env: {}
+          - name: x86_64-gnu-llvm-18
+            env:
+              RUST_BACKTRACE: 1
+            os: ubuntu-20.04-8core-32gb
           - name: x86_64-gnu-llvm-17
             env:
               RUST_BACKTRACE: 1

Cargo.lock

@@ -4133,7 +4133,6 @@ dependencies = [
  "rustc_target",
  "rustc_trait_selection",
  "rustc_type_ir",
- "smallvec",
  "tracing",
  "unicode-security",
 ]

compiler/rustc_ast_ir/src/visit.rs

@@ -14,7 +14,7 @@ impl VisitorResult for () {
     type Residual = !;
 
     #[cfg(not(feature = "nightly"))]
-    type Residual = core::ops::Infallible;
+    type Residual = core::convert::Infallible;
 
     fn output() -> Self {}
     fn from_residual(_: Self::Residual) -> Self {}

compiler/rustc_const_eval/messages.ftl

@@ -146,9 +146,6 @@ const_eval_intern_kind = {$kind ->
     *[other] {""}
 }
 
-const_eval_invalid_align =
-    align has to be a power of 2
-
 const_eval_invalid_align_details =
     invalid align passed to `{$name}`: {$align} is {$err_kind ->
         [not_power_of_two] not a power of 2

compiler/rustc_driver_impl/src/lib.rs

@@ -676,6 +676,7 @@ fn list_metadata(early_dcx: &EarlyDiagCtxt, sess: &Session, metadata_loader: &dy
                 metadata_loader,
                 &mut v,
                 &sess.opts.unstable_opts.ls,
+                sess.cfg_version,
             )
             .unwrap();
             safe_println!("{}", String::from_utf8(v).unwrap());

compiler/rustc_infer/messages.ftl

@@ -181,14 +181,6 @@ infer_more_targeted = {$has_param_name ->
 
 infer_msl_introduces_static = introduces a `'static` lifetime requirement
 infer_msl_unmet_req = because this has an unmet lifetime requirement
-infer_need_type_info_in_coroutine =
-    type inside {$coroutine_kind ->
-    [async_block] `async` block
-    [async_closure] `async` closure
-    [async_fn] `async fn` body
-    *[coroutine] coroutine
-    } must be known in this context
-
 
 infer_nothing = {""}
 

compiler/rustc_interface/src/util.rs

@@ -101,10 +101,11 @@ pub(crate) fn run_in_thread_pool_with_globals<F: FnOnce() -> R + Send, R: Send>(
     threads: usize,
     f: F,
 ) -> R {
-    use rustc_data_structures::{jobserver, sync::FromDyn};
+    use rustc_data_structures::{defer, jobserver, sync::FromDyn};
     use rustc_middle::ty::tls;
     use rustc_query_impl::QueryCtxt;
-    use rustc_query_system::query::{deadlock, QueryContext};
+    use rustc_query_system::query::{break_query_cycles, QueryContext};
+    use std::process;
 
     let registry = sync::Registry::new(std::num::NonZero::new(threads).unwrap());
 
@@ -128,7 +129,19 @@ pub(crate) fn run_in_thread_pool_with_globals<F: FnOnce() -> R + Send, R: Send>(
             let query_map =
                 FromDyn::from(tls::with(|tcx| QueryCtxt::new(tcx).collect_active_jobs()));
             let registry = rayon_core::Registry::current();
-            thread::spawn(move || deadlock(query_map.into_inner(), &registry));
+            thread::Builder::new()
+                .name("rustc query cycle handler".to_string())
+                .spawn(move || {
+                    let on_panic = defer(|| {
+                        eprintln!("query cycle handler thread panicked, aborting process");
+                        // We need to abort here as we failed to resolve the deadlock,
+                        // otherwise the compiler could just hang,
+                        process::abort();
+                    });
+                    break_query_cycles(query_map.into_inner(), &registry);
+                    on_panic.disable();
+                })
+                .unwrap();
         });
     if let Some(size) = get_stack_size() {
         builder = builder.stack_size(size);

compiler/rustc_lint/Cargo.toml

@@ -23,7 +23,6 @@ rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }
 rustc_trait_selection = { path = "../rustc_trait_selection" }
 rustc_type_ir = { path = "../rustc_type_ir" }
-smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 tracing = "0.1"
 unicode-security = "0.1.0"
 # tidy-alphabetical-end

compiler/rustc_lint/messages.ftl

@@ -562,8 +562,6 @@ lint_suspicious_double_ref_clone =
 lint_suspicious_double_ref_deref =
     using `.deref()` on a double reference, which returns `{$ty}` instead of dereferencing the inner type
 
-lint_trivial_untranslatable_diag = diagnostic with static strings only
-
 lint_ty_qualified = usage of qualified `ty::{$ty}`
     .suggestion = try importing it and using it unqualified
 

compiler/rustc_lint/src/non_local_def.rs

@@ -2,8 +2,6 @@ use rustc_hir::{def::DefKind, Body, Item, ItemKind, Node, Path, QPath, TyKind};
 use rustc_span::def_id::{DefId, LOCAL_CRATE};
 use rustc_span::{sym, symbol::kw, ExpnKind, MacroKind};
 
-use smallvec::{smallvec, SmallVec};
-
 use crate::lints::{NonLocalDefinitionsCargoUpdateNote, NonLocalDefinitionsDiag};
 use crate::{LateContext, LateLintPass, LintContext};
 
@@ -85,7 +83,7 @@ impl<'tcx> LateLintPass<'tcx> for NonLocalDefinitions {
             if let Some(def_id) = oexpn.macro_def_id
                 && let ExpnKind::Macro(macro_kind, macro_name) = oexpn.kind
                 && def_id.krate != LOCAL_CRATE
-                && std::env::var_os("CARGO").is_some()
+                && rustc_session::utils::was_invoked_from_cargo()
             {
                 Some(NonLocalDefinitionsCargoUpdateNote {
                     macro_kind: macro_kind.descr(),
@@ -114,25 +112,25 @@ impl<'tcx> LateLintPass<'tcx> for NonLocalDefinitions {
                 // is using local items and so we don't lint on it.
 
                 // We also ignore anon-const in item by including the anon-const
-                // parent as well; and since it's quite uncommon, we use smallvec
-                // to avoid unnecessary heap allocations.
-                let local_parents: SmallVec<[DefId; 1]> = if parent_def_kind == DefKind::Const
+                // parent as well.
+                let parent_parent = if parent_def_kind == DefKind::Const
                     && parent_opt_item_name == Some(kw::Underscore)
                 {
-                    smallvec![parent, cx.tcx.parent(parent)]
+                    Some(cx.tcx.parent(parent))
                 } else {
-                    smallvec![parent]
+                    None
                 };
 
                 let self_ty_has_local_parent = match impl_.self_ty.kind {
                     TyKind::Path(QPath::Resolved(_, ty_path)) => {
-                        path_has_local_parent(ty_path, cx, &*local_parents)
+                        path_has_local_parent(ty_path, cx, parent, parent_parent)
                     }
                     TyKind::TraitObject([principle_poly_trait_ref, ..], _, _) => {
                         path_has_local_parent(
                             principle_poly_trait_ref.trait_ref.path,
                             cx,
-                            &*local_parents,
+                            parent,
+                            parent_parent,
                         )
                     }
                     TyKind::TraitObject([], _, _)
@@ -154,7 +152,7 @@ impl<'tcx> LateLintPass<'tcx> for NonLocalDefinitions {
 
                 let of_trait_has_local_parent = impl_
                     .of_trait
-                    .map(|of_trait| path_has_local_parent(of_trait.path, cx, &*local_parents))
+                    .map(|of_trait| path_has_local_parent(of_trait.path, cx, parent, parent_parent))
                     .unwrap_or(false);
 
                 // If none of them have a local parent (LOGICAL NOR) this means that
@@ -218,6 +216,16 @@ impl<'tcx> LateLintPass<'tcx> for NonLocalDefinitions {
 ///    std::convert::PartialEq<Foo<Bar>>
 ///    ^^^^^^^^^^^^^^^^^^^^^^^
 /// ```
-fn path_has_local_parent(path: &Path<'_>, cx: &LateContext<'_>, local_parents: &[DefId]) -> bool {
-    path.res.opt_def_id().is_some_and(|did| local_parents.contains(&cx.tcx.parent(did)))
+fn path_has_local_parent(
+    path: &Path<'_>,
+    cx: &LateContext<'_>,
+    impl_parent: DefId,
+    impl_parent_parent: Option<DefId>,
+) -> bool {
+    path.res.opt_def_id().is_some_and(|did| {
+        did.is_local() && {
+            let res_parent = cx.tcx.parent(did);
+            res_parent == impl_parent || Some(res_parent) == impl_parent_parent
+        }
+    })
 }

compiler/rustc_metadata/src/locator.rs

@@ -243,7 +243,6 @@ use std::{cmp, fmt};
 pub(crate) struct CrateLocator<'a> {
     // Immutable per-session configuration.
     only_needs_metadata: bool,
-    sysroot: &'a Path,
     metadata_loader: &'a dyn MetadataLoader,
     cfg_version: &'static str,
 
@@ -319,7 +318,6 @@ impl<'a> CrateLocator<'a> {
 
         CrateLocator {
             only_needs_metadata,
-            sysroot: &sess.sysroot,
             metadata_loader,
             cfg_version: sess.cfg_version,
             crate_name,
@@ -569,31 +567,47 @@ impl<'a> CrateLocator<'a> {
                 debug!("skipping empty file");
                 continue;
             }
-            let (hash, metadata) =
-                match get_metadata_section(self.target, flavor, &lib, self.metadata_loader) {
-                    Ok(blob) => {
-                        if let Some(h) = self.crate_matches(&blob, &lib) {
-                            (h, blob)
-                        } else {
-                            info!("metadata mismatch");
-                            continue;
-                        }
-                    }
-                    Err(MetadataError::LoadFailure(err)) => {
-                        info!("no metadata found: {}", err);
-                        // The file was present and created by the same compiler version, but we
-                        // couldn't load it for some reason. Give a hard error instead of silently
-                        // ignoring it, but only if we would have given an error anyway.
-                        self.crate_rejections
-                            .via_invalid
-                            .push(CrateMismatch { path: lib, got: err });
-                        continue;
-                    }
-                    Err(err @ MetadataError::NotPresent(_)) => {
-                        info!("no metadata found: {}", err);
+            let (hash, metadata) = match get_metadata_section(
+                self.target,
+                flavor,
+                &lib,
+                self.metadata_loader,
+                self.cfg_version,
+            ) {
+                Ok(blob) => {
+                    if let Some(h) = self.crate_matches(&blob, &lib) {
+                        (h, blob)
+                    } else {
+                        info!("metadata mismatch");
                         continue;
                     }
-                };
+                }
+                Err(MetadataError::VersionMismatch { expected_version, found_version }) => {
+                    // The file was present and created by the same compiler version, but we
+                    // couldn't load it for some reason. Give a hard error instead of silently
+                    // ignoring it, but only if we would have given an error anyway.
+                    info!(
+                        "Rejecting via version: expected {} got {}",
+                        expected_version, found_version
+                    );
+                    self.crate_rejections
+                        .via_version
+                        .push(CrateMismatch { path: lib, got: found_version });
+                    continue;
+                }
+                Err(MetadataError::LoadFailure(err)) => {
+                    info!("no metadata found: {}", err);
+                    // The file was present and created by the same compiler version, but we
+                    // couldn't load it for some reason. Give a hard error instead of silently
+                    // ignoring it, but only if we would have given an error anyway.
+                    self.crate_rejections.via_invalid.push(CrateMismatch { path: lib, got: err });
+                    continue;
+                }
+                Err(err @ MetadataError::NotPresent(_)) => {
+                    info!("no metadata found: {}", err);
+                    continue;
+                }
+            };
             // If we see multiple hashes, emit an error about duplicate candidates.
             if slot.as_ref().is_some_and(|s| s.0 != hash) {
                 if let Some(candidates) = err_data {
@@ -610,32 +624,6 @@ impl<'a> CrateLocator<'a> {
                 continue;
             }
 
-            // Ok so at this point we've determined that `(lib, kind)` above is
-            // a candidate crate to load, and that `slot` is either none (this
-            // is the first crate of its kind) or if some the previous path has
-            // the exact same hash (e.g., it's the exact same crate).
-            //
-            // In principle these two candidate crates are exactly the same so
-            // we can choose either of them to link. As a stupidly gross hack,
-            // however, we favor crate in the sysroot.
-            //
-            // You can find more info in rust-lang/rust#39518 and various linked
-            // issues, but the general gist is that during testing libstd the
-            // compilers has two candidates to choose from: one in the sysroot
-            // and one in the deps folder. These two crates are the exact same
-            // crate but if the compiler chooses the one in the deps folder
-            // it'll cause spurious errors on Windows.
-            //
-            // As a result, we favor the sysroot crate here. Note that the
-            // candidates are all canonicalized, so we canonicalize the sysroot
-            // as well.
-            if let Some((prev, _)) = &ret {
-                let sysroot = self.sysroot;
-                let sysroot = try_canonicalize(sysroot).unwrap_or_else(|_| sysroot.to_path_buf());
-                if prev.starts_with(&sysroot) {
-                    continue;
-                }
-            }
             *slot = Some((hash, metadata, lib.clone()));
             ret = Some((lib, kind));
         }
@@ -648,16 +636,6 @@ impl<'a> CrateLocator<'a> {
     }
 
     fn crate_matches(&mut self, metadata: &MetadataBlob, libpath: &Path) -> Option<Svh> {
-        let rustc_version = rustc_version(self.cfg_version);
-        let found_version = metadata.get_rustc_version();
-        if found_version != rustc_version {
-            info!("Rejecting via version: expected {} got {}", rustc_version, found_version);
-            self.crate_rejections
-                .via_version
-                .push(CrateMismatch { path: libpath.to_path_buf(), got: found_version });
-            return None;
-        }
-
         let header = metadata.get_header();
         if header.is_proc_macro_crate != self.is_proc_macro {
             info!(
@@ -770,6 +748,7 @@ fn get_metadata_section<'p>(
     flavor: CrateFlavor,
     filename: &'p Path,
     loader: &dyn MetadataLoader,
+    cfg_version: &'static str,
 ) -> Result<MetadataBlob, MetadataError<'p>> {
     if !filename.exists() {
         return Err(MetadataError::NotPresent(filename));
@@ -847,13 +826,18 @@ fn get_metadata_section<'p>(
         }
     };
     let blob = MetadataBlob(raw_bytes);
-    if blob.is_compatible() {
-        Ok(blob)
-    } else {
-        Err(MetadataError::LoadFailure(format!(
+    match blob.check_compatibility(cfg_version) {
+        Ok(()) => Ok(blob),
+        Err(None) => Err(MetadataError::LoadFailure(format!(
             "invalid metadata version found: {}",
             filename.display()
-        )))
+        ))),
+        Err(Some(found_version)) => {
+            return Err(MetadataError::VersionMismatch {
+                expected_version: rustc_version(cfg_version),
+                found_version,
+            });
+        }
     }
 }
 
@@ -864,9 +848,10 @@ pub fn list_file_metadata(
     metadata_loader: &dyn MetadataLoader,
     out: &mut dyn Write,
     ls_kinds: &[String],
+    cfg_version: &'static str,
 ) -> IoResult<()> {
     let flavor = get_flavor_from_path(path);
-    match get_metadata_section(target, flavor, path, metadata_loader) {
+    match get_metadata_section(target, flavor, path, metadata_loader, cfg_version) {
         Ok(metadata) => metadata.list_crate_metadata(out, ls_kinds),
         Err(msg) => write!(out, "{msg}\n"),
     }
@@ -932,6 +917,8 @@ enum MetadataError<'a> {
     NotPresent(&'a Path),
     /// The file was present and invalid.
     LoadFailure(String),
+    /// The file was present, but compiled with a different rustc version.
+    VersionMismatch { expected_version: String, found_version: String },
 }
 
 impl fmt::Display for MetadataError<'_> {
@@ -941,6 +928,12 @@ impl fmt::Display for MetadataError<'_> {
                 f.write_str(&format!("no such file: '{}'", filename.display()))
             }
             MetadataError::LoadFailure(msg) => f.write_str(msg),
+            MetadataError::VersionMismatch { expected_version, found_version } => {
+                f.write_str(&format!(
+                    "rustc version mismatch. expected {}, found {}",
+                    expected_version, found_version,
+                ))
+            }
         }
     }
 }