Rollup of 9 pull requests

RELEASES.md

@@ -1,3 +1,119 @@
+Version 1.84.0 (2025-01-09)
+==========================
+
+<a id="
+Language"></a>
+
+Language
+--------
+- [Allow `#[deny]` inside `#[forbid]` as a no-op](https://github.com/rust-lang/rust/pull/121560/)
+- [Show a warning when `-Ctarget-feature` is used to toggle features that can lead to unsoundness due to ABI mismatches](https://github.com/rust-lang/rust/pull/129884)
+- [Use the next-generation trait solver in coherence](https://github.com/rust-lang/rust/pull/130654)
+- [Allow coercions to drop the principal of trait objects](https://github.com/rust-lang/rust/pull/131857)
+- [Support `/` as the path separator for `include!()` in all cases on Windows](https://github.com/rust-lang/rust/pull/125205)
+- [Taking a raw ref (`raw (const|mut)`) of a deref of a pointer (`*ptr`) is now safe](https://github.com/rust-lang/rust/pull/129248)
+- [Stabilize s390x inline assembly](https://github.com/rust-lang/rust/pull/131258)
+- [Stabilize Arm64EC inline assembly](https://github.com/rust-lang/rust/pull/131781)
+- [Lint against creating pointers to immediately dropped temporaries](https://github.com/rust-lang/rust/pull/128985)
+- [Execute drop glue when unwinding in an `extern "C"` function](https://github.com/rust-lang/rust/pull/129582)
+
+<a id="1.84.0-Compiler"></a>
+
+Compiler
+--------
+- [Add `--print host-tuple` flag to print the host target tuple and affirm the "target tuple" terminology over "target triple"](https://github.com/rust-lang/rust/pull/125579)
+- [Declaring functions with a calling convention not supported on the current target now triggers a hard error](https://github.com/rust-lang/rust/pull/129935)
+- [Set up indirect access to external data for `loongarch64-unknown-linux-{musl,ohos}`](https://github.com/rust-lang/rust/pull/131583)
+- [Enable XRay instrumentation for LoongArch Linux targets](https://github.com/rust-lang/rust/pull/131818)
+- [Extend the `unexpected_cfgs` lint to also warn in external macros](https://github.com/rust-lang/rust/pull/132577)
+- [Stabilize WebAssembly `multivalue`, `reference-types`, and `tail-call` target features](https://github.com/rust-lang/rust/pull/131080)
+- [Added Tier 2 support for the `wasm32v1-none` target](https://github.com/rust-lang/rust/pull/131487)
+
+<a id="1.84.0-Libraries"></a>
+
+Libraries
+---------
+- [Implement `From<&mut {slice}>` for `Box/Rc/Arc<{slice}>`](https://github.com/rust-lang/rust/pull/129329)
+- [Move `<float>::copysign`, `<float>::abs`, `<float>::signum` to `core`](https://github.com/rust-lang/rust/pull/131304)
+- [Add `LowerExp` and `UpperExp` implementations to `NonZero`](https://github.com/rust-lang/rust/pull/131377)
+- [Implement `FromStr` for `CString` and `TryFrom<CString>` for `String`](https://github.com/rust-lang/rust/pull/130608)
+- [`std::os::darwin` has been made public](https://github.com/rust-lang/rust/pull/130635)
+
+<a id="1.84.0-Stabilized-APIs"></a>
+
+Stabilized APIs
+---------------
+
+- [`Ipv6Addr::is_unique_local`](https://doc.rust-lang.org/stable/core/net/struct.Ipv6Addr.html#method.is_unique_local)
+- [`Ipv6Addr::is_unicast_link_local`](https://doc.rust-lang.org/stable/core/net/struct.Ipv6Addr.html#method.is_unicast_link_local)
+- [`core::ptr::with_exposed_provenance`](https://doc.rust-lang.org/stable/core/ptr/fn.with_exposed_provenance.html)
+- [`core::ptr::with_exposed_provenance_mut`](https://doc.rust-lang.org/stable/core/ptr/fn.with_exposed_provenance_mut.html)
+- [`<ptr>::addr`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.addr)
+- [`<ptr>::expose_provenance`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.expose_provenance)
+- [`<ptr>::with_addr`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.with_addr)
+- [`<ptr>::map_addr`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.map_addr)
+- [`<int>::isqrt`](https://doc.rust-lang.org/stable/core/primitive.i32.html#method.isqrt)
+- [`<int>::checked_isqrt`](https://doc.rust-lang.org/stable/core/primitive.i32.html#method.checked_isqrt)
+- [`<uint>::isqrt`](https://doc.rust-lang.org/stable/core/primitive.u32.html#method.isqrt)
+- [`NonZero::isqrt`](https://doc.rust-lang.org/stable/core/num/struct.NonZero.html#impl-NonZero%3Cu128%3E/method.isqrt)
+- [`core::ptr::without_provenance`](https://doc.rust-lang.org/stable/core/ptr/fn.without_provenance.html)
+- [`core::ptr::without_provenance_mut`](https://doc.rust-lang.org/stable/core/ptr/fn.without_provenance_mut.html)
+- [`core::ptr::dangling`](https://doc.rust-lang.org/stable/core/ptr/fn.dangling.html)
+- [`core::ptr::dangling_mut`](https://doc.rust-lang.org/stable/core/ptr/fn.dangling_mut.html)
+
+These APIs are now stable in const contexts
+
+- [`AtomicBool::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicBool.html#method.from_ptr)
+- [`AtomicPtr::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicPtr.html#method.from_ptr)
+- [`AtomicU8::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicU8.html#method.from_ptr)
+- [`AtomicU16::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicU16.html#method.from_ptr)
+- [`AtomicU32::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicU32.html#method.from_ptr)
+- [`AtomicU64::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicU64.html#method.from_ptr)
+- [`AtomicUsize::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicUsize.html#method.from_ptr)
+- [`AtomicI8::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicI8.html#method.from_ptr)
+- [`AtomicI16::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicI16.html#method.from_ptr)
+- [`AtomicI32::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicI32.html#method.from_ptr)
+- [`AtomicI64::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicI64.html#method.from_ptr)
+- [`AtomicIsize::from_ptr`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicIsize.html#method.from_ptr)
+- [`<ptr>::is_null`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.is_null-1)
+- [`<ptr>::as_ref`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.as_ref-1)
+- [`<ptr>::as_mut`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.as_mut)
+- [`Pin::new`](https://doc.rust-lang.org/stable/core/pin/struct.Pin.html#method.new)
+- [`Pin::new_unchecked`](https://doc.rust-lang.org/stable/core/pin/struct.Pin.html#method.new_unchecked)
+- [`Pin::get_ref`](https://doc.rust-lang.org/stable/core/pin/struct.Pin.html#method.get_ref)
+- [`Pin::into_ref`](https://doc.rust-lang.org/stable/core/pin/struct.Pin.html#method.into_ref)
+- [`Pin::get_mut`](https://doc.rust-lang.org/stable/core/pin/struct.Pin.html#method.get_mut)
+- [`Pin::get_unchecked_mut`](https://doc.rust-lang.org/stable/core/pin/struct.Pin.html#method.get_unchecked_mut)
+- [`Pin::static_ref`](https://doc.rust-lang.org/stable/core/pin/struct.Pin.html#method.static_ref)
+- [`Pin::static_mut`](https://doc.rust-lang.org/stable/core/pin/struct.Pin.html#method.static_mut)
+
+<a id="1.84.0-Cargo"></a>
+
+Cargo
+-----
+- [Stabilize MSRV-aware resolver config](https://github.com/rust-lang/cargo/pull/14639/)
+- [Stabilize resolver v3](https://github.com/rust-lang/cargo/pull/14754/)
+
+<a id="1.84-Rustdoc"></a>
+
+Rustdoc
+-------
+
+- [rustdoc-search: improve type-driven search](https://github.com/rust-lang/rust/pull/127589)
+
+<a id="1.84.0-Compatibility-Notes"></a>
+
+Compatibility Notes
+-------------------
+- [Enable by default the `LSX` target feature for LoongArch Linux targets](https://github.com/rust-lang/rust/pull/132140)
+- [The unstable `-Zprofile` flag (“gcov-style” coverage instrumentation) has been removed.](https://github.com/rust-lang/rust/pull/131829) This does not affect the stable flags for coverage instrumentation (`-Cinstrument-coverage`) and profile-guided optimization (`-Cprofile-generate`, `-Cprofile-use`), which are unrelated and remain available.
+- Support for the target named `wasm32-wasi` has been removed as the target is now named `wasm32-wasip1`. This completes the [transition](https://github.com/rust-lang/compiler-team/issues/607) [plan](https://github.com/rust-lang/compiler-team/issues/695) for this target following [the introduction of `wasm32-wasip1`](https://github.com/rust-lang/rust/pull/120468) in Rust 1.78. Compiler warnings on [use of `wasm32-wasi`](https://github.com/rust-lang/rust/pull/126662) introduced in Rust 1.81 are now gone as well as the target is removed.
+- [The syntax `&pin (mut|const) T` is now parsed as a type which in theory could affect macro expansion results in some edge cases](https://github.com/rust-lang/rust/pull/130635#issuecomment-2375462821)
+- [Legacy syntax for calling `std::arch` functions is no longer permitted to declare items or bodies (such as closures, inline consts, or async blocks).](https://github.com/rust-lang/rust/pull/130443#issuecomment-2445678945)
+- The `wasm32-unknown-emscripten` target's binary release of the standard library is now [built with the latest emsdk 3.1.68](https://github.com/rust-lang/rust/pull/131533), which fixes an ABI-incompatibility with Emscripten >= 3.1.42. If you are locally using a version of emsdk with an incompatible ABI (e.g. before 3.1.42 or a future one), you should build your code with `-Zbuild-std` to ensure that `std` uses the correct ABI.
+- [Declaring functions with a calling convention not supported on the current target now triggers a hard error](https://github.com/rust-lang/rust/pull/129935)
+- [The next-generation trait solver is now enabled for coherence, fixing multiple soundness issues](https://github.com/rust-lang/rust/pull/130654)
+
 Version 1.83.0 (2024-11-28)
 ==========================
 

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -109,7 +109,10 @@ unsafe fn configure_llvm(sess: &Session) {
             add("-wasm-enable-eh", false);
         }
 
-        if sess.target.os == "emscripten" && sess.panic_strategy() == PanicStrategy::Unwind {
+        if sess.target.os == "emscripten"
+            && !sess.opts.unstable_opts.emscripten_wasm_eh
+            && sess.panic_strategy() == PanicStrategy::Unwind
+        {
             add("-enable-emscripten-cxx-exceptions", false);
         }
 

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -2451,10 +2451,12 @@ fn add_order_independent_options(
     }
 
     if sess.target.os == "emscripten" {
-        cmd.cc_arg("-s").cc_arg(if sess.panic_strategy() == PanicStrategy::Abort {
-            "DISABLE_EXCEPTION_CATCHING=1"
+        cmd.cc_arg(if sess.panic_strategy() == PanicStrategy::Abort {
+            "-sDISABLE_EXCEPTION_CATCHING=1"
+        } else if sess.opts.unstable_opts.emscripten_wasm_eh {
+            "-fwasm-exceptions"
         } else {
-            "DISABLE_EXCEPTION_CATCHING=0"
+            "-sDISABLE_EXCEPTION_CATCHING=0"
         });
     }
 

compiler/rustc_codegen_ssa/src/base.rs

@@ -388,7 +388,8 @@ pub(crate) fn build_shift_expr_rhs<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
 // exceptions. This means that the VM does the unwinding for
 // us
 pub fn wants_wasm_eh(sess: &Session) -> bool {
-    sess.target.is_like_wasm && sess.target.os != "emscripten"
+    sess.target.is_like_wasm
+        && (sess.target.os != "emscripten" || sess.opts.unstable_opts.emscripten_wasm_eh)
 }
 
 /// Returns `true` if this session's target will use SEH-based unwinding.

compiler/rustc_driver_impl/src/lib.rs

@@ -52,8 +52,8 @@ use rustc_metadata::locator;
 use rustc_middle::ty::TyCtxt;
 use rustc_parse::{new_parser_from_file, new_parser_from_source_str, unwrap_or_emit_fatal};
 use rustc_session::config::{
-    CG_OPTIONS, ErrorOutputType, Input, OutFileName, OutputType, UnstableOptions, Z_OPTIONS,
-    nightly_options,
+    CG_OPTIONS, ErrorOutputType, Input, OptionDesc, OutFileName, OutputType, UnstableOptions,
+    Z_OPTIONS, nightly_options,
 };
 use rustc_session::getopts::{self, Matches};
 use rustc_session::lint::{Lint, LintId};
@@ -1124,14 +1124,6 @@ pub fn describe_flag_categories(early_dcx: &EarlyDiagCtxt, matches: &Matches) ->
         return true;
     }
 
-    if cg_flags.iter().any(|x| *x == "no-stack-check") {
-        early_dcx.early_warn("the `-Cno-stack-check` flag is deprecated and does nothing");
-    }
-
-    if cg_flags.iter().any(|x| x.starts_with("inline-threshold")) {
-        early_dcx.early_warn("the `-Cinline-threshold` flag is deprecated and does nothing (consider using `-Cllvm-args=--inline-threshold=...`)");
-    }
-
     if cg_flags.iter().any(|x| *x == "passes=list") {
         let backend_name = debug_flags.iter().find_map(|x| x.strip_prefix("codegen-backend="));
 
@@ -1156,18 +1148,16 @@ fn describe_codegen_flags() {
     print_flag_list("-C", config::CG_OPTIONS);
 }
 
-fn print_flag_list<T>(
-    cmdline_opt: &str,
-    flag_list: &[(&'static str, T, &'static str, &'static str)],
-) {
-    let max_len = flag_list.iter().map(|&(name, _, _, _)| name.chars().count()).max().unwrap_or(0);
+fn print_flag_list<T>(cmdline_opt: &str, flag_list: &[OptionDesc<T>]) {
+    let max_len =
+        flag_list.iter().map(|opt_desc| opt_desc.name().chars().count()).max().unwrap_or(0);
 
-    for &(name, _, _, desc) in flag_list {
+    for opt_desc in flag_list {
         safe_println!(
             "    {} {:>width$}=val -- {}",
             cmdline_opt,
-            name.replace('_', "-"),
-            desc,
+            opt_desc.name().replace('_', "-"),
+            opt_desc.desc(),
             width = max_len
         );
     }
@@ -1221,8 +1211,8 @@ pub fn handle_options(early_dcx: &EarlyDiagCtxt, args: &[String]) -> Option<geto
         let msg: Option<String> = match e {
             getopts::Fail::UnrecognizedOption(ref opt) => CG_OPTIONS
                 .iter()
-                .map(|&(name, ..)| ('C', name))
-                .chain(Z_OPTIONS.iter().map(|&(name, ..)| ('Z', name)))
+                .map(|opt_desc| ('C', opt_desc.name()))
+                .chain(Z_OPTIONS.iter().map(|opt_desc| ('Z', opt_desc.name())))
                 .find(|&(_, name)| *opt == name.replace('_', "-"))
                 .map(|(flag, _)| format!("{e}. Did you mean `-{flag} {opt}`?")),
             getopts::Fail::ArgumentMissing(ref opt) => {

compiler/rustc_feature/src/builtin_attrs.rs

@@ -37,6 +37,7 @@ const GATED_CFGS: &[GatedCfg] = &[
     (sym::sanitizer_cfi_normalize_integers, sym::cfg_sanitizer_cfi, Features::cfg_sanitizer_cfi),
     // this is consistent with naming of the compiler flag it's for
     (sym::fmt_debug, sym::fmt_debug, Features::fmt_debug),
+    (sym::emscripten_wasm_eh, sym::cfg_emscripten_wasm_eh, Features::cfg_emscripten_wasm_eh),
 ];
 
 /// Find a gated cfg determined by the `pred`icate which is given the cfg's name.

compiler/rustc_feature/src/unstable.rs

@@ -202,6 +202,8 @@ declare_features! (
     (internal, allow_internal_unstable, "1.0.0", None),
     /// Allows using anonymous lifetimes in argument-position impl-trait.
     (unstable, anonymous_lifetime_in_impl_trait, "1.63.0", None),
+    /// Allows access to the emscripten_wasm_eh config, used by panic_unwind and unwind
+    (internal, cfg_emscripten_wasm_eh, "CURRENT_RUSTC_VERSION", None),
     /// Allows identifying the `compiler_builtins` crate.
     (internal, compiler_builtins, "1.13.0", None),
     /// Allows writing custom MIR

compiler/rustc_hir_typeck/src/intrinsicck.rs

@@ -40,13 +40,25 @@ fn unpack_option_like<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
 }
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
+    /// FIXME: Move this check out of typeck, since it'll easily cycle when revealing opaques,
+    /// and we shouldn't need to check anything here if the typeck results are tainted.
     pub(crate) fn check_transmute(&self, from: Ty<'tcx>, to: Ty<'tcx>, hir_id: HirId) {
         let tcx = self.tcx;
         let dl = &tcx.data_layout;
         let span = tcx.hir().span(hir_id);
         let normalize = |ty| {
             let ty = self.resolve_vars_if_possible(ty);
-            self.tcx.normalize_erasing_regions(self.typing_env(self.param_env), ty)
+            if let Ok(ty) =
+                self.tcx.try_normalize_erasing_regions(self.typing_env(self.param_env), ty)
+            {
+                ty
+            } else {
+                Ty::new_error_with_message(
+                    tcx,
+                    span,
+                    "tried to normalize non-wf type in check_transmute",
+                )
+            }
         };
         let from = normalize(from);
         let to = normalize(to);

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -14,7 +14,7 @@ use rustc_data_structures::sorted_map::SortedMap;
 use rustc_data_structures::unord::UnordSet;
 use rustc_errors::codes::*;
 use rustc_errors::{Applicability, Diag, MultiSpan, StashKey, pluralize, struct_span_code_err};
-use rustc_hir::def::DefKind;
+use rustc_hir::def::{CtorKind, DefKind, Res};
 use rustc_hir::def_id::DefId;
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::lang_items::LangItem;
@@ -690,6 +690,30 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 );
             }
 
+            // Check if we wrote `Self::Assoc(1)` as if it were a tuple ctor.
+            if let SelfSource::QPath(ty) = source
+                && let hir::TyKind::Path(hir::QPath::Resolved(_, path)) = ty.kind
+                && let Res::SelfTyAlias { alias_to: impl_def_id, .. } = path.res
+                && let DefKind::Impl { .. } = self.tcx.def_kind(impl_def_id)
+                && let Some(candidate) = tcx.associated_items(impl_def_id).find_by_name_and_kind(
+                    self.tcx,
+                    item_name,
+                    ty::AssocKind::Type,
+                    impl_def_id,
+                )
+                && let Some(adt_def) = tcx.type_of(candidate.def_id).skip_binder().ty_adt_def()
+                && adt_def.is_struct()
+                && adt_def.non_enum_variant().ctor_kind() == Some(CtorKind::Fn)
+            {
+                let def_path = tcx.def_path_str(adt_def.did());
+                err.span_suggestion(
+                    ty.span.to(item_name.span),
+                    format!("to construct a value of type `{}`, use the explicit path", def_path),
+                    def_path,
+                    Applicability::MachineApplicable,
+                );
+            }
+
             err
         };
         if tcx.sess.source_map().is_multiline(sugg_span) {

compiler/rustc_interface/src/tests.rs

@@ -582,6 +582,7 @@ fn test_codegen_options_tracking_hash() {
     untracked!(dlltool, Some(PathBuf::from("custom_dlltool.exe")));
     untracked!(extra_filename, String::from("extra-filename"));
     untracked!(incremental, Some(String::from("abc")));
+    untracked!(inline_threshold, Some(0xf007ba11));
     // `link_arg` is omitted because it just forwards to `link_args`.
     untracked!(link_args, vec![String::from("abc"), String::from("def")]);
     untracked!(link_self_contained, LinkSelfContained::on());
@@ -613,7 +614,6 @@ fn test_codegen_options_tracking_hash() {
     tracked!(embed_bitcode, false);
     tracked!(force_frame_pointers, FramePointer::Always);
     tracked!(force_unwind_tables, Some(true));
-    tracked!(inline_threshold, Some(0xf007ba11));
     tracked!(instrument_coverage, InstrumentCoverage::Yes);
     tracked!(link_dead_code, Some(true));
     tracked!(linker_plugin_lto, LinkerPluginLto::LinkerPluginAuto);
@@ -782,6 +782,7 @@ fn test_unstable_options_tracking_hash() {
     tracked!(dwarf_version, Some(5));
     tracked!(embed_source, true);
     tracked!(emit_thin_lto, false);
+    tracked!(emscripten_wasm_eh, true);
     tracked!(export_executable_symbols, true);
     tracked!(fewer_names, Some(true));
     tracked!(fixed_x18, true);