Rollup of 9 pull requests

Cargo.lock

@@ -3204,9 +3204,11 @@ dependencies = [
  "rand",
  "rand_xoshiro",
  "rustc_data_structures",
+ "rustc_feature",
  "rustc_index",
  "rustc_macros",
  "rustc_serialize",
+ "rustc_span",
  "tracing",
 ]
 
@@ -3749,11 +3751,11 @@ dependencies = [
 name = "rustc_hir_pretty"
 version = "0.0.0"
 dependencies = [
+ "rustc_abi",
  "rustc_ast",
  "rustc_ast_pretty",
  "rustc_hir",
  "rustc_span",
- "rustc_target",
 ]
 
 [[package]]
@@ -3938,14 +3940,14 @@ dependencies = [
 name = "rustc_lint_defs"
 version = "0.0.0"
 dependencies = [
+ "rustc_abi",
  "rustc_ast",
  "rustc_data_structures",
  "rustc_error_messages",
  "rustc_hir",
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
- "rustc_target",
  "serde",
 ]
 
@@ -4054,6 +4056,7 @@ version = "0.0.0"
 dependencies = [
  "either",
  "itertools",
+ "rustc_abi",
  "rustc_apfloat",
  "rustc_arena",
  "rustc_ast",
@@ -4069,7 +4072,6 @@ dependencies = [
  "rustc_pattern_analysis",
  "rustc_session",
  "rustc_span",
- "rustc_target",
  "rustc_trait_selection",
  "tracing",
 ]

compiler/rustc_abi/Cargo.toml

@@ -9,9 +9,11 @@ bitflags = "2.4.1"
 rand = { version = "0.8.4", default-features = false, optional = true }
 rand_xoshiro = { version = "0.6.0", optional = true }
 rustc_data_structures = { path = "../rustc_data_structures", optional = true  }
+rustc_feature = { path = "../rustc_feature", optional = true }
 rustc_index = { path = "../rustc_index", default-features = false }
 rustc_macros = { path = "../rustc_macros", optional = true }
 rustc_serialize = { path = "../rustc_serialize", optional = true  }
+rustc_span = { path = "../rustc_span", optional = true }
 tracing = "0.1"
 # tidy-alphabetical-end
 
@@ -22,8 +24,10 @@ default = ["nightly", "randomize"]
 # without depending on rustc_data_structures, rustc_macros and rustc_serialize
 nightly = [
     "dep:rustc_data_structures",
+    "dep:rustc_feature",
     "dep:rustc_macros",
     "dep:rustc_serialize",
+    "dep:rustc_span",
     "rustc_index/nightly",
 ]
 randomize = ["dep:rand", "dep:rand_xoshiro", "nightly"]

compiler/rustc_target/src/spec/abi/mod.rs → compiler/rustc_abi/src/extern_abi/mod.rs

@@ -7,9 +7,11 @@ use rustc_span::{Span, Symbol};
 #[cfg(test)]
 mod tests;
 
+use ExternAbi as Abi;
+
 #[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Debug)]
 #[derive(HashStable_Generic, Encodable, Decodable)]
-pub enum Abi {
+pub enum ExternAbi {
     // Some of the ABIs come first because every time we add a new ABI, we have to re-bless all the
     // hashing tests. These are used in many places, so giving them stable values reduces test
     // churn. The specific values are meaningless.

compiler/rustc_abi/src/lib.rs

@@ -1,6 +1,7 @@
 // tidy-alphabetical-start
 #![cfg_attr(feature = "nightly", allow(internal_features))]
 #![cfg_attr(feature = "nightly", doc(rust_logo))]
+#![cfg_attr(feature = "nightly", feature(assert_matches))]
 #![cfg_attr(feature = "nightly", feature(rustc_attrs))]
 #![cfg_attr(feature = "nightly", feature(rustdoc_internals))]
 #![cfg_attr(feature = "nightly", feature(step_trait))]
@@ -28,8 +29,15 @@ mod layout;
 #[cfg(test)]
 mod tests;
 
+#[cfg(feature = "nightly")]
+mod extern_abi;
+
 pub use callconv::{Heterogeneous, HomogeneousAggregate, Reg, RegKind};
 #[cfg(feature = "nightly")]
+pub use extern_abi::{
+    AbiDisabled, AbiUnsupported, ExternAbi, all_names, enabled_names, is_enabled, is_stable, lookup,
+};
+#[cfg(feature = "nightly")]
 pub use layout::{FIRST_VARIANT, FieldIdx, Layout, TyAbiInterface, TyAndLayout, VariantIdx};
 pub use layout::{LayoutCalculator, LayoutCalculatorError};
 

compiler/rustc_ast/src/ast.rs

@@ -2810,6 +2810,8 @@ pub struct ModSpans {
 /// E.g., `extern { .. }` or `extern "C" { .. }`.
 #[derive(Clone, Encodable, Decodable, Debug)]
 pub struct ForeignMod {
+    /// Span of the `extern` keyword.
+    pub extern_span: Span,
     /// `unsafe` keyword accepted syntactically for macro DSLs, but not
     /// semantically by Rust.
     pub safety: Safety,

compiler/rustc_ast/src/mut_visit.rs

@@ -525,7 +525,7 @@ pub fn walk_ty<T: MutVisitor>(vis: &mut T, ty: &mut P<Ty>) {
 }
 
 fn walk_foreign_mod<T: MutVisitor>(vis: &mut T, foreign_mod: &mut ForeignMod) {
-    let ForeignMod { safety, abi: _, items } = foreign_mod;
+    let ForeignMod { extern_span: _, safety, abi: _, items } = foreign_mod;
     visit_safety(vis, safety);
     items.flat_map_in_place(|item| vis.flat_map_foreign_item(item));
 }

compiler/rustc_ast/src/visit.rs

@@ -366,7 +366,7 @@ impl WalkItemKind for ItemKind {
                 }
                 ModKind::Unloaded => {}
             },
-            ItemKind::ForeignMod(ForeignMod { safety: _, abi: _, items }) => {
+            ItemKind::ForeignMod(ForeignMod { extern_span: _, safety: _, abi: _, items }) => {
                 walk_list!(visitor, visit_foreign_item, items);
             }
             ItemKind::GlobalAsm(asm) => try_visit!(visitor.visit_inline_asm(asm)),

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -677,9 +677,8 @@ impl<'a> AstValidator<'a> {
                 Self::check_decl_no_pat(&bfty.decl, |span, _, _| {
                     self.dcx().emit_err(errors::PatternFnPointer { span });
                 });
-                if let Extern::Implicit(_) = bfty.ext {
-                    let sig_span = self.sess.source_map().next_point(ty.span.shrink_to_lo());
-                    self.maybe_lint_missing_abi(sig_span, ty.id);
+                if let Extern::Implicit(extern_span) = bfty.ext {
+                    self.maybe_lint_missing_abi(extern_span, ty.id);
                 }
             }
             TyKind::TraitObject(bounds, ..) => {
@@ -953,7 +952,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                 walk_list!(self, visit_attribute, &item.attrs);
                 return; // Avoid visiting again.
             }
-            ItemKind::ForeignMod(ForeignMod { abi, safety, .. }) => {
+            ItemKind::ForeignMod(ForeignMod { extern_span, abi, safety, .. }) => {
                 self.with_in_extern_mod(*safety, |this| {
                     let old_item = mem::replace(&mut this.extern_mod, Some(item.span));
                     this.visibility_not_permitted(
@@ -977,7 +976,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                     }
 
                     if abi.is_none() {
-                        this.maybe_lint_missing_abi(item.span, item.id);
+                        this.maybe_lint_missing_abi(*extern_span, item.id);
                     }
                     visit::walk_item(this, item);
                     this.extern_mod = old_item;
@@ -1350,13 +1349,13 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
         if let FnKind::Fn(
             _,
             _,
-            FnSig { span: sig_span, header: FnHeader { ext: Extern::Implicit(_), .. }, .. },
+            FnSig { header: FnHeader { ext: Extern::Implicit(extern_span), .. }, .. },
             _,
             _,
             _,
         ) = fk
         {
-            self.maybe_lint_missing_abi(*sig_span, id);
+            self.maybe_lint_missing_abi(*extern_span, id);
         }
 
         // Functions without bodies cannot have patterns.

compiler/rustc_codegen_llvm/src/context.rs

@@ -148,6 +148,11 @@ pub(crate) unsafe fn create_module<'ll>(
             target_data_layout =
                 target_data_layout.replace("-p270:32:32-p271:32:32-p272:64:64", "");
         }
+        if sess.target.arch.starts_with("sparc") {
+            // LLVM 20 updates the sparc layout to correctly align 128 bit integers to 128 bit.
+            // See https://github.com/llvm/llvm-project/pull/106951
+            target_data_layout = target_data_layout.replace("-i128:128", "");
+        }
     }
 
     // Ensure the data-layout values hardcoded remain the defaults.

compiler/rustc_codegen_ssa/src/back/metadata.rs

@@ -322,7 +322,7 @@ pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static
             // Set the appropriate flag based on ABI
             // This needs to match LLVM `RISCVELFStreamer.cpp`
             match &*sess.target.llvm_abiname {
-                "" | "ilp32" | "lp64" => (),
+                "ilp32" | "lp64" => (),
                 "ilp32f" | "lp64f" => e_flags |= elf::EF_RISCV_FLOAT_ABI_SINGLE,
                 "ilp32d" | "lp64d" => e_flags |= elf::EF_RISCV_FLOAT_ABI_DOUBLE,
                 // Note that the `lp64e` is still unstable as it's not (yet) part of the ELF psABI.

compiler/rustc_const_eval/src/check_consts/check.rs

@@ -16,7 +16,7 @@ use rustc_middle::mir::visit::Visitor;
 use rustc_middle::mir::*;
 use rustc_middle::span_bug;
 use rustc_middle::ty::adjustment::PointerCoercion;
-use rustc_middle::ty::{self, Instance, InstanceKind, Ty, TypeVisitableExt, TypingMode};
+use rustc_middle::ty::{self, Instance, InstanceKind, Ty, TypeVisitableExt};
 use rustc_mir_dataflow::Analysis;
 use rustc_mir_dataflow::impls::MaybeStorageLive;
 use rustc_mir_dataflow::storage::always_storage_live_locals;
@@ -589,7 +589,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                 // Typeck only does a "non-const" check since it operates on HIR and cannot distinguish
                 // which path expressions are getting called on and which path expressions are only used
                 // as function pointers. This is required for correctness.
-                let infcx = tcx.infer_ctxt().build(TypingMode::from_param_env(param_env));
+                let infcx = tcx.infer_ctxt().build(body.typing_mode(tcx));
                 let ocx = ObligationCtxt::new_with_diagnostics(&infcx);
 
                 let predicates = tcx.predicates_of(callee).instantiate(tcx, fn_args);

compiler/rustc_const_eval/src/check_consts/mod.rs

@@ -32,14 +32,7 @@ impl<'mir, 'tcx> ConstCx<'mir, 'tcx> {
     pub fn new(tcx: TyCtxt<'tcx>, body: &'mir mir::Body<'tcx>) -> Self {
         let def_id = body.source.def_id().expect_local();
         let param_env = tcx.param_env(def_id);
-        Self::new_with_param_env(tcx, body, param_env)
-    }
 
-    pub fn new_with_param_env(
-        tcx: TyCtxt<'tcx>,
-        body: &'mir mir::Body<'tcx>,
-        param_env: ty::ParamEnv<'tcx>,
-    ) -> Self {
         let const_kind = tcx.hir().body_const_context(body.source.def_id().expect_local());
         ConstCx { body, tcx, param_env, const_kind }
     }

compiler/rustc_const_eval/src/check_consts/ops.rs

@@ -12,7 +12,7 @@ use rustc_middle::mir::CallSource;
 use rustc_middle::span_bug;
 use rustc_middle::ty::print::{PrintTraitRefExt as _, with_no_trimmed_paths};
 use rustc_middle::ty::{
-    self, Closure, FnDef, FnPtr, GenericArgKind, GenericArgsRef, Param, TraitRef, Ty, TypingMode,
+    self, Closure, FnDef, FnPtr, GenericArgKind, GenericArgsRef, Param, TraitRef, Ty,
     suggest_constraining_type_param,
 };
 use rustc_middle::util::{CallDesugaringKind, CallKind, call_kind};
@@ -116,7 +116,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
                     let obligation =
                         Obligation::new(tcx, ObligationCause::dummy(), param_env, trait_ref);
 
-                    let infcx = tcx.infer_ctxt().build(TypingMode::from_param_env(param_env));
+                    let infcx = tcx.infer_ctxt().build(body.typing_mode(tcx));
                     let mut selcx = SelectionContext::new(&infcx);
                     let implsrc = selcx.select(&obligation);
 

compiler/rustc_const_eval/src/interpret/eval_context.rs

@@ -3,7 +3,7 @@ use rustc_errors::DiagCtxtHandle;
 use rustc_hir::def_id::DefId;
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_infer::infer::at::ToTrace;
-use rustc_infer::traits::ObligationCause;
+use rustc_infer::traits::{ObligationCause, Reveal};
 use rustc_middle::mir::interpret::{ErrorHandled, InvalidMetaKind, ReportedErrorInfo};
 use rustc_middle::query::TyCtxtAt;
 use rustc_middle::ty::layout::{
@@ -116,6 +116,7 @@ impl<'tcx, M: Machine<'tcx>> FnAbiOfHelpers<'tcx> for InterpCx<'tcx, M> {
 /// This test should be symmetric, as it is primarily about layout compatibility.
 pub(super) fn mir_assign_valid_types<'tcx>(
     tcx: TyCtxt<'tcx>,
+    typing_mode: TypingMode<'tcx>,
     param_env: ParamEnv<'tcx>,
     src: TyAndLayout<'tcx>,
     dest: TyAndLayout<'tcx>,
@@ -124,7 +125,7 @@ pub(super) fn mir_assign_valid_types<'tcx>(
     // all normal lifetimes are erased, higher-ranked types with their
     // late-bound lifetimes are still around and can lead to type
     // differences.
-    if util::relate_types(tcx, param_env, Variance::Covariant, src.ty, dest.ty) {
+    if util::relate_types(tcx, typing_mode, param_env, Variance::Covariant, src.ty, dest.ty) {
         // Make sure the layout is equal, too -- just to be safe. Miri really
         // needs layout equality. For performance reason we skip this check when
         // the types are equal. Equal types *can* have different layouts when
@@ -144,6 +145,7 @@ pub(super) fn mir_assign_valid_types<'tcx>(
 #[cfg_attr(not(debug_assertions), inline(always))]
 pub(super) fn from_known_layout<'tcx>(
     tcx: TyCtxtAt<'tcx>,
+    typing_mode: TypingMode<'tcx>,
     param_env: ParamEnv<'tcx>,
     known_layout: Option<TyAndLayout<'tcx>>,
     compute: impl FnOnce() -> InterpResult<'tcx, TyAndLayout<'tcx>>,
@@ -153,7 +155,13 @@ pub(super) fn from_known_layout<'tcx>(
         Some(known_layout) => {
             if cfg!(debug_assertions) {
                 let check_layout = compute()?;
-                if !mir_assign_valid_types(tcx.tcx, param_env, check_layout, known_layout) {
+                if !mir_assign_valid_types(
+                    tcx.tcx,
+                    typing_mode,
+                    param_env,
+                    check_layout,
+                    known_layout,
+                ) {
                     span_bug!(
                         tcx.span,
                         "expected type differs from actual type.\nexpected: {}\nactual: {}",
@@ -203,6 +211,11 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         }
     }
 
+    pub fn typing_mode(&self) -> TypingMode<'tcx> {
+        debug_assert_eq!(self.param_env.reveal(), Reveal::All);
+        TypingMode::PostAnalysis
+    }
+
     /// Returns the span of the currently executed statement/terminator.
     /// This is the span typically used for error reporting.
     #[inline(always)]
@@ -327,7 +340,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
             return true;
         }
         // Slow path: spin up an inference context to check if these traits are sufficiently equal.
-        let infcx = self.tcx.infer_ctxt().build(TypingMode::from_param_env(self.param_env));
+        let infcx = self.tcx.infer_ctxt().build(self.typing_mode());
         let ocx = ObligationCtxt::new(&infcx);
         let cause = ObligationCause::dummy_with_span(self.cur_span());
         // equate the two trait refs after normalization

compiler/rustc_const_eval/src/interpret/operand.rs

@@ -773,6 +773,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 )?;
             if !mir_assign_valid_types(
                 *self.tcx,
+                self.typing_mode(),
                 self.param_env,
                 self.layout_of(normalized_place_ty)?,
                 op.layout,
@@ -832,7 +833,9 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
             })
         };
         let layout =
-            from_known_layout(self.tcx, self.param_env, layout, || self.layout_of(ty).into())?;
+            from_known_layout(self.tcx, self.typing_mode(), self.param_env, layout, || {
+                self.layout_of(ty).into()
+            })?;
         let imm = match val_val {
             mir::ConstValue::Indirect { alloc_id, offset } => {
                 // This is const data, no mutation allowed.

compiler/rustc_const_eval/src/interpret/place.rs

@@ -540,6 +540,7 @@ where
                 )?;
             if !mir_assign_valid_types(
                 *self.tcx,
+                self.typing_mode(),
                 self.param_env,
                 self.layout_of(normalized_place_ty)?,
                 place.layout,
@@ -870,8 +871,13 @@ where
     ) -> InterpResult<'tcx> {
         // We do NOT compare the types for equality, because well-typed code can
         // actually "transmute" `&mut T` to `&T` in an assignment without a cast.
-        let layout_compat =
-            mir_assign_valid_types(*self.tcx, self.param_env, src.layout(), dest.layout());
+        let layout_compat = mir_assign_valid_types(
+            *self.tcx,
+            self.typing_mode(),
+            self.param_env,
+            src.layout(),
+            dest.layout(),
+        );
         if !allow_transmute && !layout_compat {
             span_bug!(
                 self.cur_span(),

compiler/rustc_const_eval/src/interpret/stack.rs

@@ -596,12 +596,13 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
             return interp_ok(layout);
         }
 
-        let layout = from_known_layout(self.tcx, self.param_env, layout, || {
-            let local_ty = frame.body.local_decls[local].ty;
-            let local_ty =
-                self.instantiate_from_frame_and_normalize_erasing_regions(frame, local_ty)?;
-            self.layout_of(local_ty).into()
-        })?;
+        let layout =
+            from_known_layout(self.tcx, self.typing_mode(), self.param_env, layout, || {
+                let local_ty = frame.body.local_decls[local].ty;
+                let local_ty =
+                    self.instantiate_from_frame_and_normalize_erasing_regions(frame, local_ty)?;
+                self.layout_of(local_ty).into()
+            })?;
 
         // Layouts of locals are requested a lot, so we cache them.
         state.layout.set(Some(layout));