diff options
Diffstat (limited to 'compiler/rustc_hir_analysis/src')
18 files changed, 686 insertions, 371 deletions
diff --git a/compiler/rustc_hir_analysis/src/check/dropck.rs b/compiler/rustc_hir_analysis/src/check/always_applicable.rs index d7dfe482da4..8a841a11556 100644 --- a/compiler/rustc_hir_analysis/src/check/dropck.rs +++ b/compiler/rustc_hir_analysis/src/check/always_applicable.rs @@ -1,8 +1,15 @@ +//! This module contains methods that assist in checking that impls are general +//! enough, i.e. that they always apply to every valid instantaiton of the ADT +//! they're implemented for. +//! +//! This is necessary for `Drop` and negative impls to be well-formed. + use rustc_data_structures::fx::FxHashSet; use rustc_errors::codes::*; use rustc_errors::{ErrorGuaranteed, struct_span_code_err}; use rustc_infer::infer::{RegionResolutionError, TyCtxtInferExt}; use rustc_infer::traits::{ObligationCause, ObligationCauseCode}; +use rustc_middle::span_bug; use rustc_middle::ty::util::CheckRegions; use rustc_middle::ty::{self, GenericArgsRef, Ty, TyCtxt, TypingMode}; use rustc_trait_selection::regions::InferCtxtRegionExt; @@ -27,11 +34,12 @@ use crate::hir::def_id::{DefId, LocalDefId}; /// 3. Any bounds on the generic parameters must be reflected in the /// struct/enum definition for the nominal type itself (i.e. /// cannot do `struct S<T>; impl<T:Clone> Drop for S<T> { ... }`). -/// pub(crate) fn check_drop_impl( tcx: TyCtxt<'_>, drop_impl_did: DefId, ) -> Result<(), ErrorGuaranteed> { + let drop_impl_did = drop_impl_did.expect_local(); + match tcx.impl_polarity(drop_impl_did) { ty::ImplPolarity::Positive => {} ty::ImplPolarity::Negative => { @@ -45,55 +53,110 @@ pub(crate) fn check_drop_impl( })); } } - let dtor_self_type = tcx.type_of(drop_impl_did).instantiate_identity(); - match dtor_self_type.kind() { + + tcx.ensure_ok().orphan_check_impl(drop_impl_did)?; + + let dtor_impl_trait_ref = tcx.impl_trait_ref(drop_impl_did).unwrap().instantiate_identity(); + + match dtor_impl_trait_ref.self_ty().kind() { ty::Adt(adt_def, adt_to_impl_args) => { - ensure_drop_params_and_item_params_correspond( + ensure_impl_params_and_item_params_correspond( tcx, - drop_impl_did.expect_local(), + drop_impl_did, adt_def.did(), adt_to_impl_args, )?; - ensure_drop_predicates_are_implied_by_item_defn( + ensure_impl_predicates_are_implied_by_item_defn( tcx, - drop_impl_did.expect_local(), - adt_def.did().expect_local(), + drop_impl_did, + adt_def.did(), adt_to_impl_args, ) } _ => { - // Destructors only work on nominal types. This was - // already checked by coherence, but compilation may - // not have been terminated. - let span = tcx.def_span(drop_impl_did); - let reported = tcx.dcx().span_delayed_bug( - span, - format!("should have been rejected by coherence check: {dtor_self_type}"), - ); - Err(reported) + span_bug!(tcx.def_span(drop_impl_did), "incoherent impl of Drop"); } } } -fn ensure_drop_params_and_item_params_correspond<'tcx>( +pub(crate) fn check_negative_auto_trait_impl<'tcx>( tcx: TyCtxt<'tcx>, - drop_impl_did: LocalDefId, - self_type_did: DefId, + impl_def_id: LocalDefId, + impl_trait_ref: ty::TraitRef<'tcx>, + polarity: ty::ImplPolarity, +) -> Result<(), ErrorGuaranteed> { + let ty::ImplPolarity::Negative = polarity else { + return Ok(()); + }; + + if !tcx.trait_is_auto(impl_trait_ref.def_id) { + return Ok(()); + } + + if tcx.defaultness(impl_def_id).is_default() { + tcx.dcx().span_delayed_bug(tcx.def_span(impl_def_id), "default impl cannot be negative"); + } + + tcx.ensure_ok().orphan_check_impl(impl_def_id)?; + + match impl_trait_ref.self_ty().kind() { + ty::Adt(adt_def, adt_to_impl_args) => { + ensure_impl_params_and_item_params_correspond( + tcx, + impl_def_id, + adt_def.did(), + adt_to_impl_args, + )?; + + ensure_impl_predicates_are_implied_by_item_defn( + tcx, + impl_def_id, + adt_def.did(), + adt_to_impl_args, + ) + } + _ => { + if tcx.features().auto_traits() { + // NOTE: We ignore the applicability check for negative auto impls + // defined in libcore. In the (almost impossible) future where we + // stabilize auto impls, then the proper applicability check MUST + // be implemented here to handle non-ADT rigid types. + Ok(()) + } else { + Err(tcx.dcx().span_delayed_bug( + tcx.def_span(impl_def_id), + "incoherent impl of negative auto trait", + )) + } + } + } +} + +fn ensure_impl_params_and_item_params_correspond<'tcx>( + tcx: TyCtxt<'tcx>, + impl_def_id: LocalDefId, + adt_def_id: DefId, adt_to_impl_args: GenericArgsRef<'tcx>, ) -> Result<(), ErrorGuaranteed> { let Err(arg) = tcx.uses_unique_generic_params(adt_to_impl_args, CheckRegions::OnlyParam) else { return Ok(()); }; - let drop_impl_span = tcx.def_span(drop_impl_did); - let item_span = tcx.def_span(self_type_did); - let self_descr = tcx.def_descr(self_type_did); + let impl_span = tcx.def_span(impl_def_id); + let item_span = tcx.def_span(adt_def_id); + let self_descr = tcx.def_descr(adt_def_id); + let polarity = match tcx.impl_polarity(impl_def_id) { + ty::ImplPolarity::Positive | ty::ImplPolarity::Reservation => "", + ty::ImplPolarity::Negative => "!", + }; + let trait_name = tcx + .item_name(tcx.trait_id_of_impl(impl_def_id.to_def_id()).expect("expected impl of trait")); let mut err = struct_span_code_err!( tcx.dcx(), - drop_impl_span, + impl_span, E0366, - "`Drop` impls cannot be specialized" + "`{polarity}{trait_name}` impls cannot be specialized", ); match arg { ty::util::NotUniqueParam::DuplicateParam(arg) => { @@ -116,17 +179,22 @@ fn ensure_drop_params_and_item_params_correspond<'tcx>( /// Confirms that all predicates defined on the `Drop` impl (`drop_impl_def_id`) are able to be /// proven from within `adt_def_id`'s environment. I.e. all the predicates on the impl are /// implied by the ADT being well formed. -fn ensure_drop_predicates_are_implied_by_item_defn<'tcx>( +fn ensure_impl_predicates_are_implied_by_item_defn<'tcx>( tcx: TyCtxt<'tcx>, - drop_impl_def_id: LocalDefId, - adt_def_id: LocalDefId, + impl_def_id: LocalDefId, + adt_def_id: DefId, adt_to_impl_args: GenericArgsRef<'tcx>, ) -> Result<(), ErrorGuaranteed> { let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis()); let ocx = ObligationCtxt::new_with_diagnostics(&infcx); - let impl_span = tcx.def_span(drop_impl_def_id.to_def_id()); - + let impl_span = tcx.def_span(impl_def_id.to_def_id()); + let trait_name = tcx + .item_name(tcx.trait_id_of_impl(impl_def_id.to_def_id()).expect("expected impl of trait")); + let polarity = match tcx.impl_polarity(impl_def_id) { + ty::ImplPolarity::Positive | ty::ImplPolarity::Reservation => "", + ty::ImplPolarity::Negative => "!", + }; // Take the param-env of the adt and instantiate the args that show up in // the implementation's self type. This gives us the assumptions that the // self ty of the implementation is allowed to know just from it being a @@ -145,17 +213,21 @@ fn ensure_drop_predicates_are_implied_by_item_defn<'tcx>( let adt_env = ty::EarlyBinder::bind(tcx.param_env(adt_def_id)).instantiate(tcx, adt_to_impl_args); - let fresh_impl_args = infcx.fresh_args_for_item(impl_span, drop_impl_def_id.to_def_id()); + let fresh_impl_args = infcx.fresh_args_for_item(impl_span, impl_def_id.to_def_id()); let fresh_adt_ty = - tcx.impl_trait_ref(drop_impl_def_id).unwrap().instantiate(tcx, fresh_impl_args).self_ty(); + tcx.impl_trait_ref(impl_def_id).unwrap().instantiate(tcx, fresh_impl_args).self_ty(); ocx.eq(&ObligationCause::dummy_with_span(impl_span), adt_env, fresh_adt_ty, impl_adt_ty) - .unwrap(); + .expect("equating fully generic trait ref should never fail"); - for (clause, span) in tcx.predicates_of(drop_impl_def_id).instantiate(tcx, fresh_impl_args) { - let normalize_cause = traits::ObligationCause::misc(span, adt_def_id); + for (clause, span) in tcx.predicates_of(impl_def_id).instantiate(tcx, fresh_impl_args) { + let normalize_cause = traits::ObligationCause::misc(span, impl_def_id); let pred = ocx.normalize(&normalize_cause, adt_env, clause); - let cause = traits::ObligationCause::new(span, adt_def_id, ObligationCauseCode::DropImpl); + let cause = traits::ObligationCause::new( + span, + impl_def_id, + ObligationCauseCode::AlwaysApplicableImpl, + ); ocx.register_obligation(traits::Obligation::new(tcx, cause, adt_env, pred)); } @@ -173,13 +245,13 @@ fn ensure_drop_predicates_are_implied_by_item_defn<'tcx>( let root_predicate = error.root_obligation.predicate; if root_predicates.insert(root_predicate) { let item_span = tcx.def_span(adt_def_id); - let self_descr = tcx.def_descr(adt_def_id.to_def_id()); + let self_descr = tcx.def_descr(adt_def_id); guar = Some( struct_span_code_err!( tcx.dcx(), error.root_obligation.cause.span, E0367, - "`Drop` impl requires `{root_predicate}` \ + "`{polarity}{trait_name}` impl requires `{root_predicate}` \ but the {self_descr} it is implemented for does not", ) .with_span_note(item_span, "the implementor must specify the same requirement") @@ -190,12 +262,12 @@ fn ensure_drop_predicates_are_implied_by_item_defn<'tcx>( return Err(guar.unwrap()); } - let errors = ocx.infcx.resolve_regions(adt_def_id, adt_env, []); + let errors = ocx.infcx.resolve_regions(impl_def_id, adt_env, []); if !errors.is_empty() { let mut guar = None; for error in errors { let item_span = tcx.def_span(adt_def_id); - let self_descr = tcx.def_descr(adt_def_id.to_def_id()); + let self_descr = tcx.def_descr(adt_def_id); let outlives = match error { RegionResolutionError::ConcreteFailure(_, a, b) => format!("{b}: {a}"), RegionResolutionError::GenericBoundFailure(_, generic, r) => { @@ -212,7 +284,7 @@ fn ensure_drop_predicates_are_implied_by_item_defn<'tcx>( tcx.dcx(), error.origin().span(), E0367, - "`Drop` impl requires `{outlives}` \ + "`{polarity}{trait_name}` impl requires `{outlives}` \ but the {self_descr} it is implemented for does not", ) .with_span_note(item_span, "the implementor must specify the same requirement") diff --git a/compiler/rustc_hir_analysis/src/check/check.rs b/compiler/rustc_hir_analysis/src/check/check.rs index f2331f3fd8e..8f9997cb62c 100644 --- a/compiler/rustc_hir_analysis/src/check/check.rs +++ b/compiler/rustc_hir_analysis/src/check/check.rs @@ -70,7 +70,6 @@ fn check_struct(tcx: TyCtxt<'_>, def_id: LocalDefId) { check_transparent(tcx, def); check_packed(tcx, span, def); - check_unsafe_fields(tcx, def_id); } fn check_union(tcx: TyCtxt<'_>, def_id: LocalDefId) { @@ -144,36 +143,6 @@ fn check_union_fields(tcx: TyCtxt<'_>, span: Span, item_def_id: LocalDefId) -> b true } -/// Check that the unsafe fields do not need dropping. -fn check_unsafe_fields(tcx: TyCtxt<'_>, item_def_id: LocalDefId) { - let span = tcx.def_span(item_def_id); - let def = tcx.adt_def(item_def_id); - - let typing_env = ty::TypingEnv::non_body_analysis(tcx, item_def_id); - let args = ty::GenericArgs::identity_for_item(tcx, item_def_id); - - for field in def.all_fields() { - if !field.safety.is_unsafe() { - continue; - } - - if !allowed_union_or_unsafe_field(tcx, field.ty(tcx, args), typing_env, span) { - let hir::Node::Field(field) = tcx.hir_node_by_def_id(field.did.expect_local()) else { - unreachable!("field has to correspond to hir field") - }; - let ty_span = field.ty.span; - tcx.dcx().emit_err(errors::InvalidUnsafeField { - field_span: field.span, - sugg: errors::InvalidUnsafeFieldSuggestion { - lo: ty_span.shrink_to_lo(), - hi: ty_span.shrink_to_hi(), - }, - note: (), - }); - } - } -} - /// Check that a `static` is inhabited. fn check_static_inhabited(tcx: TyCtxt<'_>, def_id: LocalDefId) { // Make sure statics are inhabited. @@ -745,14 +714,10 @@ fn check_static_linkage(tcx: TyCtxt<'_>, def_id: LocalDefId) { pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) { match tcx.def_kind(def_id) { DefKind::Static { .. } => { - tcx.ensure_ok().typeck(def_id); - maybe_check_static_with_link_section(tcx, def_id); check_static_inhabited(tcx, def_id); check_static_linkage(tcx, def_id); } - DefKind::Const => { - tcx.ensure_ok().typeck(def_id); - } + DefKind::Const => {} DefKind::Enum => { check_enum(tcx, def_id); } @@ -766,7 +731,6 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) { ExternAbi::Rust, ) } - // Everything else is checked entirely within check_item_body } DefKind::Impl { of_trait } => { if of_trait && let Some(impl_trait_header) = tcx.impl_trait_header(def_id) { @@ -1517,7 +1481,6 @@ fn check_enum(tcx: TyCtxt<'_>, def_id: LocalDefId) { detect_discriminant_duplicate(tcx, def); check_transparent(tcx, def); - check_unsafe_fields(tcx, def_id); } /// Part of enum check. Given the discriminants of an enum, errors if two or more discriminants are equal diff --git a/compiler/rustc_hir_analysis/src/check/intrinsicck.rs b/compiler/rustc_hir_analysis/src/check/intrinsicck.rs index 590ade516ec..d63165f0f16 100644 --- a/compiler/rustc_hir_analysis/src/check/intrinsicck.rs +++ b/compiler/rustc_hir_analysis/src/check/intrinsicck.rs @@ -3,8 +3,11 @@ use rustc_ast::InlineAsmTemplatePiece; use rustc_data_structures::fx::FxIndexSet; use rustc_hir::def_id::DefId; use rustc_hir::{self as hir, LangItem}; +use rustc_infer::infer::InferCtxt; use rustc_middle::bug; -use rustc_middle::ty::{self, Article, FloatTy, IntTy, Ty, TyCtxt, TypeVisitableExt, UintTy}; +use rustc_middle::ty::{ + self, Article, FloatTy, IntTy, Ty, TyCtxt, TypeVisitableExt, TypeckResults, UintTy, +}; use rustc_session::lint; use rustc_span::def_id::LocalDefId; use rustc_span::{Symbol, sym}; @@ -14,12 +17,11 @@ use rustc_target::asm::{ use crate::errors::RegisterTypeUnstable; -pub struct InlineAsmCtxt<'a, 'tcx: 'a> { - tcx: TyCtxt<'tcx>, +pub struct InlineAsmCtxt<'a, 'tcx> { typing_env: ty::TypingEnv<'tcx>, target_features: &'tcx FxIndexSet<Symbol>, - expr_ty: Box<dyn Fn(&hir::Expr<'tcx>) -> Ty<'tcx> + 'a>, - node_ty: Box<dyn Fn(hir::HirId) -> Ty<'tcx> + 'a>, + infcx: &'a InferCtxt<'tcx>, + typeck_results: &'a TypeckResults<'tcx>, } enum NonAsmTypeReason<'tcx> { @@ -31,34 +33,38 @@ enum NonAsmTypeReason<'tcx> { impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { pub fn new( - tcx: TyCtxt<'tcx>, def_id: LocalDefId, + infcx: &'a InferCtxt<'tcx>, typing_env: ty::TypingEnv<'tcx>, - expr_ty: impl Fn(&hir::Expr<'tcx>) -> Ty<'tcx> + 'a, - node_ty: impl Fn(hir::HirId) -> Ty<'tcx> + 'a, + typeck_results: &'a TypeckResults<'tcx>, ) -> Self { InlineAsmCtxt { - tcx, typing_env, - target_features: tcx.asm_target_features(def_id), - expr_ty: Box::new(expr_ty), - node_ty: Box::new(node_ty), + target_features: infcx.tcx.asm_target_features(def_id), + infcx, + typeck_results, } } - fn expr_ty(&self, expr: &hir::Expr<'tcx>) -> Ty<'tcx> { - (self.expr_ty)(expr) + fn tcx(&self) -> TyCtxt<'tcx> { + self.infcx.tcx } - fn node_ty(&self, hir_id: hir::HirId) -> Ty<'tcx> { - (self.node_ty)(hir_id) + fn expr_ty(&self, expr: &hir::Expr<'tcx>) -> Ty<'tcx> { + let ty = self.typeck_results.expr_ty_adjusted(expr); + let ty = self.infcx.resolve_vars_if_possible(ty); + if ty.has_non_region_infer() { + Ty::new_misc_error(self.tcx()) + } else { + self.tcx().erase_regions(ty) + } } // FIXME(compiler-errors): This could use `<$ty as Pointee>::Metadata == ()` fn is_thin_ptr_ty(&self, ty: Ty<'tcx>) -> bool { // Type still may have region variables, but `Sized` does not depend // on those, so just erase them before querying. - if ty.is_sized(self.tcx, self.typing_env) { + if ty.is_sized(self.tcx(), self.typing_env) { return true; } if let ty::Foreign(..) = ty.kind() { @@ -68,7 +74,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { } fn get_asm_ty(&self, ty: Ty<'tcx>) -> Result<InlineAsmType, NonAsmTypeReason<'tcx>> { - let asm_ty_isize = match self.tcx.sess.target.pointer_width { + let asm_ty_isize = match self.tcx().sess.target.pointer_width { 16 => InlineAsmType::I16, 32 => InlineAsmType::I32, 64 => InlineAsmType::I64, @@ -97,12 +103,12 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { ty::Adt(adt, args) if adt.repr().simd() => { let fields = &adt.non_enum_variant().fields; let field = &fields[FieldIdx::ZERO]; - let elem_ty = field.ty(self.tcx, args); + let elem_ty = field.ty(self.tcx(), args); let (size, ty) = match elem_ty.kind() { ty::Array(ty, len) => { - let len = self.tcx.normalize_erasing_regions(self.typing_env, *len); - if let Some(len) = len.try_to_target_usize(self.tcx) { + let len = self.tcx().normalize_erasing_regions(self.typing_env, *len); + if let Some(len) = len.try_to_target_usize(self.tcx()) { (len, *ty) } else { return Err(NonAsmTypeReason::UnevaluatedSIMDArrayLength( @@ -122,7 +128,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { Ok(InlineAsmType::VecI128(size)) } ty::Int(IntTy::Isize) | ty::Uint(UintTy::Usize) => { - Ok(match self.tcx.sess.target.pointer_width { + Ok(match self.tcx().sess.target.pointer_width { 16 => InlineAsmType::VecI16(size), 32 => InlineAsmType::VecI32(size), 64 => InlineAsmType::VecI64(size), @@ -159,9 +165,9 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { // `!` is allowed for input but not for output (issue #87802) ty::Never if is_input => return None, _ if ty.references_error() => return None, - ty::Adt(adt, args) if self.tcx.is_lang_item(adt.did(), LangItem::MaybeUninit) => { + ty::Adt(adt, args) if self.tcx().is_lang_item(adt.did(), LangItem::MaybeUninit) => { let fields = &adt.non_enum_variant().fields; - let ty = fields[FieldIdx::from_u32(1)].ty(self.tcx, args); + let ty = fields[FieldIdx::from_u32(1)].ty(self.tcx(), args); // FIXME: Are we just trying to map to the `T` in `MaybeUninit<T>`? // If so, just get it from the args. let ty::Adt(ty, args) = ty.kind() else { @@ -172,7 +178,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { "expected first field of `MaybeUninit` to be `ManuallyDrop`" ); let fields = &ty.non_enum_variant().fields; - let ty = fields[FieldIdx::ZERO].ty(self.tcx, args); + let ty = fields[FieldIdx::ZERO].ty(self.tcx(), args); self.get_asm_ty(ty) } _ => self.get_asm_ty(ty), @@ -183,9 +189,9 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { match reason { NonAsmTypeReason::UnevaluatedSIMDArrayLength(did, len) => { let msg = format!("cannot evaluate SIMD vector length `{len}`"); - self.tcx + self.infcx .dcx() - .struct_span_err(self.tcx.def_span(did), msg) + .struct_span_err(self.tcx().def_span(did), msg) .with_span_note( expr.span, "SIMD vector length needs to be known statically for use in `asm!`", @@ -194,7 +200,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { } NonAsmTypeReason::Invalid(ty) => { let msg = format!("cannot use value of type `{ty}` for inline assembly"); - self.tcx.dcx().struct_span_err(expr.span, msg).with_note( + self.infcx.dcx().struct_span_err(expr.span, msg).with_note( "only integers, floats, SIMD vectors, pointers and function pointers \ can be used as arguments for inline assembly", ).emit(); @@ -203,7 +209,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { let msg = format!( "cannot use value of unsized pointer type `{ty}` for inline assembly" ); - self.tcx + self.infcx .dcx() .struct_span_err(expr.span, msg) .with_note("only sized pointers can be used in inline assembly") @@ -213,8 +219,8 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { let msg = format!( "cannot use SIMD vector with element type `{ty}` for inline assembly" ); - self.tcx.dcx() - .struct_span_err(self.tcx.def_span(did), msg).with_span_note( + self.infcx.dcx() + .struct_span_err(self.tcx().def_span(did), msg).with_span_note( expr.span, "only integers, floats, SIMD vectors, pointers and function pointers \ can be used as arguments for inline assembly", @@ -227,9 +233,9 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { // Check that the type implements Copy. The only case where this can // possibly fail is for SIMD types which don't #[derive(Copy)]. - if !self.tcx.type_is_copy_modulo_regions(self.typing_env, ty) { + if !self.tcx().type_is_copy_modulo_regions(self.typing_env, ty) { let msg = "arguments for inline assembly must be copyable"; - self.tcx + self.infcx .dcx() .struct_span_err(expr.span, msg) .with_note(format!("`{ty}` does not implement the Copy trait")) @@ -249,7 +255,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { if in_asm_ty != asm_ty { let msg = "incompatible types for asm inout argument"; let in_expr_ty = self.expr_ty(in_expr); - self.tcx + self.infcx .dcx() .struct_span_err(vec![in_expr.span, expr.span], msg) .with_span_label(in_expr.span, format!("type `{in_expr_ty}`")) @@ -268,21 +274,21 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { // Check the type against the list of types supported by the selected // register class. - let asm_arch = self.tcx.sess.asm_arch.unwrap(); - let allow_experimental_reg = self.tcx.features().asm_experimental_reg(); + let asm_arch = self.tcx().sess.asm_arch.unwrap(); + let allow_experimental_reg = self.tcx().features().asm_experimental_reg(); let reg_class = reg.reg_class(); let supported_tys = reg_class.supported_types(asm_arch, allow_experimental_reg); let Some((_, feature)) = supported_tys.iter().find(|&&(t, _)| t == asm_ty) else { let mut err = if !allow_experimental_reg && reg_class.supported_types(asm_arch, true).iter().any(|&(t, _)| t == asm_ty) { - self.tcx.sess.create_feature_err( + self.tcx().sess.create_feature_err( RegisterTypeUnstable { span: expr.span, ty }, sym::asm_experimental_reg, ) } else { let msg = format!("type `{ty}` cannot be used with this register class"); - let mut err = self.tcx.dcx().struct_span_err(expr.span, msg); + let mut err = self.infcx.dcx().struct_span_err(expr.span, msg); let supported_tys: Vec<_> = supported_tys.iter().map(|(t, _)| t.to_string()).collect(); err.note(format!( @@ -312,7 +318,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { if let Some(feature) = feature { if !self.target_features.contains(feature) { let msg = format!("`{feature}` target feature is not enabled"); - self.tcx + self.infcx .dcx() .struct_span_err(expr.span, msg) .with_note(format!( @@ -349,7 +355,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { result: default_result, size: default_size, } = reg_class.default_modifier(asm_arch).unwrap(); - self.tcx.node_span_lint( + self.tcx().node_span_lint( lint::builtin::ASM_SUB_REGISTER, expr.hir_id, spans, @@ -371,11 +377,11 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { } pub fn check_asm(&self, asm: &hir::InlineAsm<'tcx>) { - let Some(asm_arch) = self.tcx.sess.asm_arch else { - self.tcx.dcx().delayed_bug("target architecture does not support asm"); + let Some(asm_arch) = self.tcx().sess.asm_arch else { + self.infcx.dcx().delayed_bug("target architecture does not support asm"); return; }; - let allow_experimental_reg = self.tcx.features().asm_experimental_reg(); + let allow_experimental_reg = self.tcx().features().asm_experimental_reg(); for (idx, &(op, op_sp)) in asm.operands.iter().enumerate() { // Validate register classes against currently enabled target // features. We check that at least one type is available for @@ -398,13 +404,13 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { } if let Err(msg) = reg.validate( asm_arch, - self.tcx.sess.relocation_model(), + self.tcx().sess.relocation_model(), self.target_features, - &self.tcx.sess.target, + &self.tcx().sess.target, op.is_clobber(), ) { let msg = format!("cannot use register `{}`: {}", reg.name(), msg); - self.tcx.dcx().span_err(op_sp, msg); + self.infcx.dcx().span_err(op_sp, msg); continue; } } @@ -444,7 +450,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { reg_class.name(), feature ); - self.tcx.dcx().span_err(op_sp, msg); + self.infcx.dcx().span_err(op_sp, msg); // register isn't enabled, don't do more checks continue; } @@ -458,7 +464,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { .intersperse(", ") .collect::<String>(), ); - self.tcx.dcx().span_err(op_sp, msg); + self.infcx.dcx().span_err(op_sp, msg); // register isn't enabled, don't do more checks continue; } @@ -493,16 +499,16 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { } } hir::InlineAsmOperand::Const { anon_const } => { - let ty = self.node_ty(anon_const.hir_id); + let ty = self.expr_ty(self.tcx().hir_body(anon_const.body).value); match ty.kind() { ty::Error(_) => {} _ if ty.is_integral() => {} _ => { - self.tcx + self.infcx .dcx() .struct_span_err(op_sp, "invalid type for `const` operand") .with_span_label( - self.tcx.def_span(anon_const.def_id), + self.tcx().def_span(anon_const.def_id), format!("is {} `{}`", ty.kind().article(), ty), ) .with_help("`const` operands must be of an integer type") @@ -517,7 +523,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> { ty::FnDef(..) => {} ty::Error(_) => {} _ => { - self.tcx + self.infcx .dcx() .struct_span_err(op_sp, "invalid `sym` operand") .with_span_label( diff --git a/compiler/rustc_hir_analysis/src/check/mod.rs b/compiler/rustc_hir_analysis/src/check/mod.rs index 1c5455710db..9c28fac809d 100644 --- a/compiler/rustc_hir_analysis/src/check/mod.rs +++ b/compiler/rustc_hir_analysis/src/check/mod.rs @@ -62,9 +62,9 @@ a type parameter). */ +pub mod always_applicable; mod check; mod compare_impl_item; -pub mod dropck; mod entry; pub mod intrinsic; pub mod intrinsicck; @@ -113,11 +113,11 @@ pub fn provide(providers: &mut Providers) { } fn adt_destructor(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Option<ty::Destructor> { - tcx.calculate_dtor(def_id.to_def_id(), dropck::check_drop_impl) + tcx.calculate_dtor(def_id.to_def_id(), always_applicable::check_drop_impl) } fn adt_async_destructor(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Option<ty::AsyncDestructor> { - tcx.calculate_async_dtor(def_id.to_def_id(), dropck::check_drop_impl) + tcx.calculate_async_dtor(def_id.to_def_id(), always_applicable::check_drop_impl) } /// Given a `DefId` for an opaque type in return position, find its parent item's return @@ -145,7 +145,7 @@ pub fn forbid_intrinsic_abi(tcx: TyCtxt<'_>, sp: Span, abi: ExternAbi) { } } -fn maybe_check_static_with_link_section(tcx: TyCtxt<'_>, id: LocalDefId) { +pub(super) fn maybe_check_static_with_link_section(tcx: TyCtxt<'_>, id: LocalDefId) { // Only restricted on wasm target for now if !tcx.sess.target.is_like_wasm { return; diff --git a/compiler/rustc_hir_analysis/src/check/wfcheck.rs b/compiler/rustc_hir_analysis/src/check/wfcheck.rs index d72cf00293f..a400aaa8142 100644 --- a/compiler/rustc_hir_analysis/src/check/wfcheck.rs +++ b/compiler/rustc_hir_analysis/src/check/wfcheck.rs @@ -126,13 +126,14 @@ where let infcx_compat = infcx.fork(); - // We specifically want to call the non-compat version of `implied_bounds_tys`; we do this always. + // We specifically want to *disable* the implied bounds hack, first, + // so we can detect when failures are due to bevy's implied bounds. let outlives_env = OutlivesEnvironment::new_with_implied_bounds_compat( &infcx, body_def_id, param_env, assumed_wf_types.iter().copied(), - false, + true, ); lint_redundant_lifetimes(tcx, body_def_id, &outlives_env); @@ -142,53 +143,22 @@ where return Ok(()); } - let is_bevy = assumed_wf_types.visit_with(&mut ContainsBevyParamSet { tcx }).is_break(); - - // If we have set `no_implied_bounds_compat`, then do not attempt compatibility. - // We could also just always enter if `is_bevy`, and call `implied_bounds_tys`, - // but that does result in slightly more work when this option is set and - // just obscures what we mean here anyways. Let's just be explicit. - if is_bevy && !infcx.tcx.sess.opts.unstable_opts.no_implied_bounds_compat { - let outlives_env = OutlivesEnvironment::new_with_implied_bounds_compat( - &infcx, - body_def_id, - param_env, - assumed_wf_types, - true, - ); - let errors_compat = infcx_compat.resolve_regions_with_outlives_env(&outlives_env); - if errors_compat.is_empty() { - Ok(()) - } else { - Err(infcx_compat.err_ctxt().report_region_errors(body_def_id, &errors_compat)) - } + let outlives_env = OutlivesEnvironment::new_with_implied_bounds_compat( + &infcx_compat, + body_def_id, + param_env, + assumed_wf_types, + // Don't *disable* the implied bounds hack; though this will only apply + // the implied bounds hack if this contains `bevy_ecs`'s `ParamSet` type. + false, + ); + let errors_compat = infcx_compat.resolve_regions_with_outlives_env(&outlives_env); + if errors_compat.is_empty() { + // FIXME: Once we fix bevy, this would be the place to insert a warning + // to upgrade bevy. + Ok(()) } else { - Err(infcx.err_ctxt().report_region_errors(body_def_id, &errors)) - } -} - -struct ContainsBevyParamSet<'tcx> { - tcx: TyCtxt<'tcx>, -} - -impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ContainsBevyParamSet<'tcx> { - type Result = ControlFlow<()>; - - fn visit_ty(&mut self, t: Ty<'tcx>) -> Self::Result { - // We only care to match `ParamSet<T>` or `&ParamSet<T>`. - match t.kind() { - ty::Adt(def, _) => { - if self.tcx.item_name(def.did()) == sym::ParamSet - && self.tcx.crate_name(def.did().krate) == sym::bevy_ecs - { - return ControlFlow::Break(()); - } - } - ty::Ref(_, ty, _) => ty.visit_with(self)?, - _ => {} - } - - ControlFlow::Continue(()) + Err(infcx_compat.err_ctxt().report_region_errors(body_def_id, &errors_compat)) } } @@ -201,7 +171,7 @@ fn check_well_formed(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Result<(), ErrorGua hir::Node::ImplItem(item) => check_impl_item(tcx, item), hir::Node::ForeignItem(item) => check_foreign_item(tcx, item), hir::Node::OpaqueTy(_) => Ok(crate::check::check::check_item_type(tcx, def_id)), - _ => unreachable!(), + _ => unreachable!("{node:?}"), }; if let Some(generics) = node.generics() { @@ -1108,7 +1078,13 @@ fn check_associated_item( let ty = tcx.type_of(item.def_id).instantiate_identity(); let ty = wfcx.normalize(span, Some(WellFormedLoc::Ty(item_id)), ty); wfcx.register_wf_obligation(span, loc, ty.into()); - check_sized_if_body(wfcx, item.def_id.expect_local(), ty, Some(span)); + check_sized_if_body( + wfcx, + item.def_id.expect_local(), + ty, + Some(span), + ObligationCauseCode::SizedConstOrStatic, + ); Ok(()) } ty::AssocKind::Fn => { @@ -1354,7 +1330,7 @@ fn check_item_type( traits::ObligationCause::new( ty_span, wfcx.body_def_id, - ObligationCauseCode::WellFormed(None), + ObligationCauseCode::SizedConstOrStatic, ), wfcx.param_env, item_ty, @@ -1698,6 +1674,7 @@ fn check_fn_or_method<'tcx>( hir::FnRetTy::Return(ty) => Some(ty.span), hir::FnRetTy::DefaultReturn(_) => None, }, + ObligationCauseCode::SizedReturnType, ); } @@ -1706,13 +1683,14 @@ fn check_sized_if_body<'tcx>( def_id: LocalDefId, ty: Ty<'tcx>, maybe_span: Option<Span>, + code: ObligationCauseCode<'tcx>, ) { let tcx = wfcx.tcx(); if let Some(body) = tcx.hir_maybe_body_owned_by(def_id) { let span = maybe_span.unwrap_or(body.value.span); wfcx.register_bound( - ObligationCause::new(span, def_id, traits::ObligationCauseCode::SizedReturnType), + ObligationCause::new(span, def_id, code), wfcx.param_env, ty, tcx.require_lang_item(LangItem::Sized, Some(span)), diff --git a/compiler/rustc_hir_analysis/src/coherence/mod.rs b/compiler/rustc_hir_analysis/src/coherence/mod.rs index 0245d4c9fe4..b5c6c2f3861 100644 --- a/compiler/rustc_hir_analysis/src/coherence/mod.rs +++ b/compiler/rustc_hir_analysis/src/coherence/mod.rs @@ -16,6 +16,7 @@ use rustc_span::{ErrorGuaranteed, sym}; use rustc_type_ir::elaborate; use tracing::debug; +use crate::check::always_applicable; use crate::errors; mod builtin; @@ -24,11 +25,12 @@ mod inherent_impls_overlap; mod orphan; mod unsafety; -fn check_impl( - tcx: TyCtxt<'_>, +fn check_impl<'tcx>( + tcx: TyCtxt<'tcx>, impl_def_id: LocalDefId, - trait_ref: ty::TraitRef<'_>, - trait_def: &ty::TraitDef, + trait_ref: ty::TraitRef<'tcx>, + trait_def: &'tcx ty::TraitDef, + polarity: ty::ImplPolarity, ) -> Result<(), ErrorGuaranteed> { debug!( "(checking implementation) adding impl for trait '{:?}', item '{}'", @@ -44,6 +46,12 @@ fn check_impl( enforce_trait_manually_implementable(tcx, impl_def_id, trait_ref.def_id, trait_def) .and(enforce_empty_impls_for_marker_traits(tcx, impl_def_id, trait_ref.def_id, trait_def)) + .and(always_applicable::check_negative_auto_trait_impl( + tcx, + impl_def_id, + trait_ref, + polarity, + )) } fn enforce_trait_manually_implementable( @@ -154,16 +162,16 @@ fn coherent_trait(tcx: TyCtxt<'_>, def_id: DefId) -> Result<(), ErrorGuaranteed> let mut res = tcx.ensure_ok().specialization_graph_of(def_id); for &impl_def_id in impls { - let trait_header = tcx.impl_trait_header(impl_def_id).unwrap(); - let trait_ref = trait_header.trait_ref.instantiate_identity(); + let impl_header = tcx.impl_trait_header(impl_def_id).unwrap(); + let trait_ref = impl_header.trait_ref.instantiate_identity(); let trait_def = tcx.trait_def(trait_ref.def_id); res = res - .and(check_impl(tcx, impl_def_id, trait_ref, trait_def)) + .and(check_impl(tcx, impl_def_id, trait_ref, trait_def, impl_header.polarity)) .and(check_object_overlap(tcx, impl_def_id, trait_ref)) - .and(unsafety::check_item(tcx, impl_def_id, trait_header, trait_def)) + .and(unsafety::check_item(tcx, impl_def_id, impl_header, trait_def)) .and(tcx.ensure_ok().orphan_check_impl(impl_def_id)) - .and(builtin::check_trait(tcx, def_id, impl_def_id, trait_header)); + .and(builtin::check_trait(tcx, def_id, impl_def_id, impl_header)); } res diff --git a/compiler/rustc_hir_analysis/src/collect.rs b/compiler/rustc_hir_analysis/src/collect.rs index 027aa5554a4..49523912b14 100644 --- a/compiler/rustc_hir_analysis/src/collect.rs +++ b/compiler/rustc_hir_analysis/src/collect.rs @@ -45,6 +45,7 @@ use tracing::{debug, instrument}; use crate::check::intrinsic::intrinsic_operation_unsafety; use crate::errors; +use crate::hir_ty_lowering::errors::assoc_kind_str; use crate::hir_ty_lowering::{FeedConstTy, HirTyLowerer, RegionInferReason}; pub(crate) mod dump; @@ -443,13 +444,14 @@ impl<'tcx> HirTyLowerer<'tcx> for ItemCtxt<'tcx> { self.tcx.at(span).type_param_predicates((self.item_def_id, def_id, assoc_name)) } - fn lower_assoc_ty( + fn lower_assoc_shared( &self, span: Span, item_def_id: DefId, - item_segment: &hir::PathSegment<'tcx>, + item_segment: &rustc_hir::PathSegment<'tcx>, poly_trait_ref: ty::PolyTraitRef<'tcx>, - ) -> Ty<'tcx> { + kind: ty::AssocKind, + ) -> Result<(DefId, ty::GenericArgsRef<'tcx>), ErrorGuaranteed> { if let Some(trait_ref) = poly_trait_ref.no_bound_vars() { let item_args = self.lowerer().lower_generic_args_of_assoc_item( span, @@ -457,7 +459,7 @@ impl<'tcx> HirTyLowerer<'tcx> for ItemCtxt<'tcx> { item_segment, trait_ref.args, ); - Ty::new_projection_from_args(self.tcx(), item_def_id, item_args) + Ok((item_def_id, item_args)) } else { // There are no late-bound regions; we can just ignore the binder. let (mut mpart_sugg, mut inferred_sugg) = (None, None); @@ -518,16 +520,14 @@ impl<'tcx> HirTyLowerer<'tcx> for ItemCtxt<'tcx> { } _ => {} } - Ty::new_error( - self.tcx(), - self.tcx().dcx().emit_err(errors::AssociatedItemTraitUninferredGenericParams { - span, - inferred_sugg, - bound, - mpart_sugg, - what: "type", - }), - ) + + Err(self.tcx().dcx().emit_err(errors::AssociatedItemTraitUninferredGenericParams { + span, + inferred_sugg, + bound, + mpart_sugg, + what: assoc_kind_str(kind), + })) } } diff --git a/compiler/rustc_hir_analysis/src/collect/generics_of.rs b/compiler/rustc_hir_analysis/src/collect/generics_of.rs index af1338e50d0..a153ce8ea90 100644 --- a/compiler/rustc_hir_analysis/src/collect/generics_of.rs +++ b/compiler/rustc_hir_analysis/src/collect/generics_of.rs @@ -187,6 +187,8 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics { Some(parent_did) } Node::TyPat(_) => Some(parent_did), + // Field default values inherit the ADT's generics. + Node::Field(_) => Some(parent_did), _ => None, } } diff --git a/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs b/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs index 6b61d317d3f..883a1acdb30 100644 --- a/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs +++ b/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs @@ -1462,7 +1462,8 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> { for &(opaque_def_id, captures) in opaque_capture_scopes.iter().rev() { let mut captures = captures.borrow_mut(); let remapped = *captures.entry(lifetime).or_insert_with(|| { - let feed = self.tcx.create_def(opaque_def_id, ident.name, DefKind::LifetimeParam); + let feed = + self.tcx.create_def(opaque_def_id, Some(ident.name), DefKind::LifetimeParam); feed.def_span(ident.span); feed.def_ident_span(Some(ident.span)); feed.def_id() diff --git a/compiler/rustc_hir_analysis/src/errors.rs b/compiler/rustc_hir_analysis/src/errors.rs index 852533ff5c9..4c6c2504126 100644 --- a/compiler/rustc_hir_analysis/src/errors.rs +++ b/compiler/rustc_hir_analysis/src/errors.rs @@ -11,8 +11,6 @@ use rustc_middle::ty::Ty; use rustc_span::{Ident, Span, Symbol}; use crate::fluent_generated as fluent; -mod pattern_types; -pub(crate) use pattern_types::*; pub(crate) mod wrong_number_of_generic_args; mod precise_captures; @@ -84,6 +82,8 @@ pub(crate) struct AssocItemNotFound<'a> { pub label: Option<AssocItemNotFoundLabel<'a>>, #[subdiagnostic] pub sugg: Option<AssocItemNotFoundSugg<'a>>, + #[label(hir_analysis_within_macro)] + pub within_macro_span: Option<Span>, } #[derive(Subdiagnostic)] @@ -711,17 +711,6 @@ pub(crate) struct InvalidUnionField { } #[derive(Diagnostic)] -#[diag(hir_analysis_invalid_unsafe_field, code = E0740)] -pub(crate) struct InvalidUnsafeField { - #[primary_span] - pub field_span: Span, - #[subdiagnostic] - pub sugg: InvalidUnsafeFieldSuggestion, - #[note] - pub note: (), -} - -#[derive(Diagnostic)] #[diag(hir_analysis_return_type_notation_on_non_rpitit)] pub(crate) struct ReturnTypeNotationOnNonRpitit<'tcx> { #[primary_span] @@ -742,18 +731,6 @@ pub(crate) struct InvalidUnionFieldSuggestion { pub hi: Span, } -#[derive(Subdiagnostic)] -#[multipart_suggestion( - hir_analysis_invalid_unsafe_field_sugg, - applicability = "machine-applicable" -)] -pub(crate) struct InvalidUnsafeFieldSuggestion { - #[suggestion_part(code = "std::mem::ManuallyDrop<")] - pub lo: Span, - #[suggestion_part(code = ">")] - pub hi: Span, -} - #[derive(Diagnostic)] #[diag(hir_analysis_return_type_notation_equality_bound)] pub(crate) struct ReturnTypeNotationEqualityBound { diff --git a/compiler/rustc_hir_analysis/src/errors/pattern_types.rs b/compiler/rustc_hir_analysis/src/errors/pattern_types.rs deleted file mode 100644 index ec7b3aaa1c1..00000000000 --- a/compiler/rustc_hir_analysis/src/errors/pattern_types.rs +++ /dev/null @@ -1,14 +0,0 @@ -use rustc_macros::Diagnostic; -use rustc_middle::ty::Ty; -use rustc_span::Span; - -#[derive(Diagnostic)] -#[diag(hir_analysis_invalid_base_type)] -pub(crate) struct InvalidBaseType<'tcx> { - pub ty: Ty<'tcx>, - #[primary_span] - pub ty_span: Span, - pub pat: &'static str, - #[note] - pub pat_span: Span, -} diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs index dd346ed1f97..60af36da6e2 100644 --- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs +++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs @@ -468,11 +468,13 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { // Good error for `where Trait::method(..): Send`. let Some(self_ty) = opt_self_ty else { - return self.error_missing_qpath_self_ty( + let guar = self.error_missing_qpath_self_ty( trait_def_id, hir_ty.span, item_segment, + ty::AssocKind::Type, ); + return Ty::new_error(tcx, guar); }; let self_ty = self.lower_ty(self_ty); diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs index 922578792ba..ace5e34b382 100644 --- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs +++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs @@ -151,6 +151,9 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { qself: &qself_str, label: None, sugg: None, + // Try to get the span of the identifier within the path's syntax context + // (if that's different). + within_macro_span: assoc_name.span.within_macro(span, tcx.sess.source_map()), }; if is_dummy { @@ -385,14 +388,17 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { }) } - pub(super) fn report_ambiguous_assoc_ty( + pub(super) fn report_ambiguous_assoc( &self, span: Span, types: &[String], traits: &[String], name: Symbol, + kind: ty::AssocKind, ) -> ErrorGuaranteed { - let mut err = struct_span_code_err!(self.dcx(), span, E0223, "ambiguous associated type"); + let kind_str = assoc_kind_str(kind); + let mut err = + struct_span_code_err!(self.dcx(), span, E0223, "ambiguous associated {kind_str}"); if self .tcx() .resolutions(()) @@ -417,7 +423,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { span, format!( "if there were a type named `Type` that implements a trait named \ - `Trait` with associated type `{name}`, you could use the \ + `Trait` with associated {kind_str} `{name}`, you could use the \ fully-qualified path", ), format!("<Type as Trait>::{name}"), @@ -440,7 +446,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { span, format!( "if there were a type named `Example` that implemented one of the \ - traits with associated type `{name}`, you could use the \ + traits with associated {kind_str} `{name}`, you could use the \ fully-qualified path", ), traits.iter().map(|trait_str| format!("<Example as {trait_str}>::{name}")), @@ -451,7 +457,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { err.span_suggestion_verbose( span, format!( - "if there were a trait named `Example` with associated type `{name}` \ + "if there were a trait named `Example` with associated {kind_str} `{name}` \ implemented for `{type_str}`, you could use the fully-qualified path", ), format!("<{type_str} as Example>::{name}"), @@ -462,7 +468,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { err.span_suggestions( span, format!( - "if there were a trait named `Example` with associated type `{name}` \ + "if there were a trait named `Example` with associated {kind_str} `{name}` \ implemented for one of the types, you could use the fully-qualified \ path", ), @@ -491,7 +497,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { err.emit() } - pub(crate) fn complain_about_ambiguous_inherent_assoc_ty( + pub(crate) fn complain_about_ambiguous_inherent_assoc( &self, name: Ident, candidates: Vec<DefId>, @@ -552,13 +558,14 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { } // FIXME(inherent_associated_types): Find similarly named associated types and suggest them. - pub(crate) fn complain_about_inherent_assoc_ty_not_found( + pub(crate) fn complain_about_inherent_assoc_not_found( &self, name: Ident, self_ty: Ty<'tcx>, candidates: Vec<(DefId, (DefId, DefId))>, fulfillment_errors: Vec<FulfillmentError<'tcx>>, span: Span, + kind: ty::AssocKind, ) -> ErrorGuaranteed { // FIXME(fmease): This was copied in parts from an old version of `rustc_hir_typeck::method::suggest`. // Either @@ -568,12 +575,16 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { let tcx = self.tcx(); + let kind_str = assoc_kind_str(kind); let adt_did = self_ty.ty_adt_def().map(|def| def.did()); let add_def_label = |err: &mut Diag<'_>| { if let Some(did) = adt_did { err.span_label( tcx.def_span(did), - format!("associated item `{name}` not found for this {}", tcx.def_descr(did)), + format!( + "associated {kind_str} `{name}` not found for this {}", + tcx.def_descr(did) + ), ); } }; @@ -600,11 +611,11 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { self.dcx(), name.span, E0220, - "associated type `{name}` not found for `{self_ty}` in the current scope" + "associated {kind_str} `{name}` not found for `{self_ty}` in the current scope" ); err.span_label(name.span, format!("associated item not found in `{self_ty}`")); err.note(format!( - "the associated type was found for\n{type_candidates}{additional_types}", + "the associated {kind_str} was found for\n{type_candidates}{additional_types}", )); add_def_label(&mut err); return err.emit(); @@ -685,7 +696,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { let mut err = self.dcx().struct_span_err( name.span, - format!("the associated type `{name}` exists for `{self_ty}`, but its trait bounds were not satisfied") + format!("the associated {kind_str} `{name}` exists for `{self_ty}`, but its trait bounds were not satisfied") ); if !bounds.is_empty() { err.note(format!( @@ -695,7 +706,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { } err.span_label( name.span, - format!("associated type cannot be referenced on `{self_ty}` due to unsatisfied trait bounds") + format!("associated {kind_str} cannot be referenced on `{self_ty}` due to unsatisfied trait bounds") ); for (span, mut bounds) in bound_spans { @@ -1614,7 +1625,7 @@ fn generics_args_err_extend<'a>( } } -pub(super) fn assoc_kind_str(kind: ty::AssocKind) -> &'static str { +pub(crate) fn assoc_kind_str(kind: ty::AssocKind) -> &'static str { match kind { ty::AssocKind::Fn => "function", ty::AssocKind::Const => "constant", diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs index fa58f12c553..60a60f6415a 100644 --- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs +++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs @@ -115,7 +115,7 @@ fn generic_arg_mismatch_err( body.value.kind && let Res::Def(DefKind::Fn { .. }, id) = path.res { - // FIXME(min_generic_const_args): this branch is dead once new const path lowering + // FIXME(mgca): this branch is dead once new const path lowering // (for single-segment paths) is no longer gated err.help(format!("`{}` is a function item, not a type", tcx.item_name(id))); err.help("function item types cannot be named directly"); diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/lint.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/lint.rs index f5e075367f3..e78801dd601 100644 --- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/lint.rs +++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/lint.rs @@ -78,15 +78,18 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { } if self_ty.span.edition().at_least_rust_2021() { - let msg = "expected a type, found a trait"; - let label = "you can add the `dyn` keyword if you want a trait object"; - let mut diag = - rustc_errors::struct_span_code_err!(self.dcx(), self_ty.span, E0782, "{}", msg); + let mut diag = rustc_errors::struct_span_code_err!( + self.dcx(), + self_ty.span, + E0782, + "{}", + "expected a type, found a trait" + ); if self_ty.span.can_be_used_for_suggestions() && !self.maybe_suggest_impl_trait(self_ty, &mut diag) + && !self.maybe_suggest_dyn_trait(self_ty, sugg, &mut diag) { - // FIXME: Only emit this suggestion if the trait is dyn-compatible. - diag.multipart_suggestion_verbose(label, sugg, Applicability::MachineApplicable); + self.maybe_suggest_add_generic_impl_trait(self_ty, &mut diag); } // Check if the impl trait that we are considering is an impl of a local trait. self.maybe_suggest_blanket_trait_impl(self_ty, &mut diag); @@ -123,6 +126,64 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { } } + /// For a struct or enum with an invalid bare trait object field, suggest turning + /// it into a generic type bound. + fn maybe_suggest_add_generic_impl_trait( + &self, + self_ty: &hir::Ty<'_>, + diag: &mut Diag<'_>, + ) -> bool { + let tcx = self.tcx(); + + let parent_hir_id = tcx.parent_hir_id(self_ty.hir_id); + let parent_item = tcx.hir_get_parent_item(self_ty.hir_id).def_id; + + let generics = match tcx.hir_node_by_def_id(parent_item) { + hir::Node::Item(hir::Item { + kind: hir::ItemKind::Struct(variant, generics), .. + }) => { + if !variant.fields().iter().any(|field| field.hir_id == parent_hir_id) { + return false; + } + generics + } + hir::Node::Item(hir::Item { kind: hir::ItemKind::Enum(def, generics), .. }) => { + if !def + .variants + .iter() + .flat_map(|variant| variant.data.fields().iter()) + .any(|field| field.hir_id == parent_hir_id) + { + return false; + } + generics + } + _ => return false, + }; + + let Ok(rendered_ty) = tcx.sess.source_map().span_to_snippet(self_ty.span) else { + return false; + }; + + let param = "TUV" + .chars() + .map(|c| c.to_string()) + .chain((0..).map(|i| format!("P{i}"))) + .find(|s| !generics.params.iter().any(|param| param.name.ident().as_str() == s)) + .expect("we definitely can find at least one param name to generate"); + let mut sugg = vec![(self_ty.span, param.to_string())]; + if let Some(insertion_span) = generics.span_for_param_suggestion() { + sugg.push((insertion_span, format!(", {param}: {}", rendered_ty))); + } else { + sugg.push((generics.where_clause_span, format!("<{param}: {}>", rendered_ty))); + } + diag.multipart_suggestion_verbose( + "you might be missing a type parameter", + sugg, + Applicability::MachineApplicable, + ); + true + } /// Make sure that we are in the condition to suggest the blanket implementation. fn maybe_suggest_blanket_trait_impl<G: EmissionGuarantee>( &self, @@ -171,6 +232,65 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { } } + /// Try our best to approximate when adding `dyn` would be helpful for a bare + /// trait object. + /// + /// Right now, this is if the type is either directly nested in another ty, + /// or if it's in the tail field within a struct. This approximates what the + /// user would've gotten on edition 2015, except for the case where we have + /// an *obvious* knock-on `Sized` error. + fn maybe_suggest_dyn_trait( + &self, + self_ty: &hir::Ty<'_>, + sugg: Vec<(Span, String)>, + diag: &mut Diag<'_>, + ) -> bool { + let tcx = self.tcx(); + + // Look at the direct HIR parent, since we care about the relationship between + // the type and the thing that directly encloses it. + match tcx.parent_hir_node(self_ty.hir_id) { + // These are all generally ok. Namely, when a trait object is nested + // into another expression or ty, it's either very certain that they + // missed the ty (e.g. `&Trait`) or it's not really possible to tell + // what their intention is, so let's not give confusing suggestions and + // just mention `dyn`. The user can make up their mind what to do here. + hir::Node::Ty(_) + | hir::Node::Expr(_) + | hir::Node::PatExpr(_) + | hir::Node::PathSegment(_) + | hir::Node::AssocItemConstraint(_) + | hir::Node::TraitRef(_) + | hir::Node::Item(_) + | hir::Node::WherePredicate(_) => {} + + hir::Node::Field(field) => { + // Enums can't have unsized fields, fields can only have an unsized tail field. + if let hir::Node::Item(hir::Item { + kind: hir::ItemKind::Struct(variant, _), .. + }) = tcx.parent_hir_node(field.hir_id) + && variant + .fields() + .last() + .is_some_and(|tail_field| tail_field.hir_id == field.hir_id) + { + // Ok + } else { + return false; + } + } + _ => return false, + } + + // FIXME: Only emit this suggestion if the trait is dyn-compatible. + diag.multipart_suggestion_verbose( + "you can add the `dyn` keyword if you want a trait object", + sugg, + Applicability::MachineApplicable, + ); + true + } + fn add_generic_param_suggestion( &self, generics: &hir::Generics<'_>, diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs index a0f848f07c4..dd6c40bfbb8 100644 --- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs +++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs @@ -44,18 +44,18 @@ use rustc_middle::ty::{ }; use rustc_middle::{bug, span_bug}; use rustc_session::lint::builtin::AMBIGUOUS_ASSOCIATED_ITEMS; +use rustc_session::parse::feature_err; use rustc_span::edit_distance::find_best_match_for_name; -use rustc_span::{DUMMY_SP, Ident, Span, Symbol, kw}; +use rustc_span::{DUMMY_SP, Ident, Span, Symbol, kw, sym}; use rustc_trait_selection::infer::InferCtxtExt; use rustc_trait_selection::traits::wf::object_region_bounds; use rustc_trait_selection::traits::{self, ObligationCtxt}; use rustc_type_ir::Upcast; use tracing::{debug, instrument}; +use self::errors::assoc_kind_str; use crate::check::check_abi_fn_ptr; -use crate::errors::{ - AmbiguousLifetimeBound, BadReturnTypeNotation, InvalidBaseType, NoVariantNamed, -}; +use crate::errors::{AmbiguousLifetimeBound, BadReturnTypeNotation, NoVariantNamed}; use crate::hir_ty_lowering::errors::{GenericsArgsErrExtend, prohibit_assoc_item_constraint}; use crate::hir_ty_lowering::generics::{check_generic_arg_count, lower_generic_args}; use crate::middle::resolve_bound_vars as rbv; @@ -152,7 +152,7 @@ pub trait HirTyLowerer<'tcx> { assoc_name: Ident, ) -> ty::EarlyBinder<'tcx, &'tcx [(ty::Clause<'tcx>, Span)]>; - /// Lower an associated type to a projection. + /// Lower an associated type/const (from a trait) to a projection. /// /// This method has to be defined by the concrete lowering context because /// dealing with higher-ranked trait references depends on its capabilities: @@ -164,13 +164,14 @@ pub trait HirTyLowerer<'tcx> { /// /// The canonical example of this is associated type `T::P` where `T` is a type /// param constrained by `T: for<'a> Trait<'a>` and where `Trait` defines `P`. - fn lower_assoc_ty( + fn lower_assoc_shared( &self, span: Span, item_def_id: DefId, item_segment: &hir::PathSegment<'tcx>, poly_trait_ref: ty::PolyTraitRef<'tcx>, - ) -> Ty<'tcx>; + kind: ty::AssocKind, + ) -> Result<(DefId, GenericArgsRef<'tcx>), ErrorGuaranteed>; fn lower_fn_sig( &self, @@ -245,6 +246,42 @@ pub enum FeedConstTy<'a, 'tcx> { No, } +#[derive(Debug, Clone, Copy)] +enum LowerAssocMode { + Type { permit_variants: bool }, + Const, +} + +impl LowerAssocMode { + fn kind(self) -> ty::AssocKind { + match self { + LowerAssocMode::Type { .. } => ty::AssocKind::Type, + LowerAssocMode::Const => ty::AssocKind::Const, + } + } + + fn def_kind(self) -> DefKind { + match self { + LowerAssocMode::Type { .. } => DefKind::AssocTy, + LowerAssocMode::Const => DefKind::AssocConst, + } + } + + fn permit_variants(self) -> bool { + match self { + LowerAssocMode::Type { permit_variants } => permit_variants, + // FIXME(mgca): Support paths like `Option::<T>::None` or `Option::<T>::Some` which resolve to const ctors/fn items respectively + LowerAssocMode::Const => false, + } + } +} + +#[derive(Debug, Clone, Copy)] +enum LoweredAssoc<'tcx> { + Term(DefId, GenericArgsRef<'tcx>), + Variant { adt: Ty<'tcx>, variant_did: DefId }, +} + /// New-typed boolean indicating whether explicit late-bound lifetimes /// are present in a set of generic arguments. /// @@ -630,7 +667,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { (args, arg_count) } - #[instrument(level = "debug", skip_all)] + #[instrument(level = "debug", skip(self))] pub fn lower_generic_args_of_assoc_item( &self, span: Span, @@ -638,7 +675,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { item_segment: &hir::PathSegment<'tcx>, parent_args: GenericArgsRef<'tcx>, ) -> GenericArgsRef<'tcx> { - debug!(?span, ?item_def_id, ?item_segment); let (args, _) = self.lower_generic_args_of_path(span, item_def_id, parent_args, item_segment, None); if let Some(c) = item_segment.args().constraints.first() { @@ -1118,7 +1154,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { // NOTE: When this function starts resolving `Trait::AssocTy` successfully // it should also start reporting the `BARE_TRAIT_OBJECTS` lint. #[instrument(level = "debug", skip_all, ret)] - pub fn lower_assoc_path( + pub fn lower_assoc_path_ty( &self, hir_ref_id: HirId, span: Span, @@ -1127,6 +1163,72 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { assoc_segment: &'tcx hir::PathSegment<'tcx>, permit_variants: bool, ) -> Result<(Ty<'tcx>, DefKind, DefId), ErrorGuaranteed> { + let tcx = self.tcx(); + match self.lower_assoc_path_shared( + hir_ref_id, + span, + qself_ty, + qself, + assoc_segment, + LowerAssocMode::Type { permit_variants }, + )? { + LoweredAssoc::Term(def_id, args) => { + let alias_ty = ty::AliasTy::new_from_args(tcx, def_id, args); + let ty = Ty::new_alias(tcx, alias_ty.kind(tcx), alias_ty); + Ok((ty, tcx.def_kind(def_id), def_id)) + } + LoweredAssoc::Variant { adt, variant_did } => Ok((adt, DefKind::Variant, variant_did)), + } + } + + #[instrument(level = "debug", skip_all, ret)] + fn lower_assoc_path_const( + &self, + hir_ref_id: HirId, + span: Span, + qself_ty: Ty<'tcx>, + qself: &'tcx hir::Ty<'tcx>, + assoc_segment: &'tcx hir::PathSegment<'tcx>, + ) -> Result<Const<'tcx>, ErrorGuaranteed> { + let tcx = self.tcx(); + let (def_id, args) = match self.lower_assoc_path_shared( + hir_ref_id, + span, + qself_ty, + qself, + assoc_segment, + LowerAssocMode::Const, + )? { + LoweredAssoc::Term(def_id, args) => { + if !tcx.associated_item(def_id).is_type_const_capable(tcx) { + let mut err = tcx.dcx().struct_span_err( + span, + "use of trait associated const without `#[type_const]`", + ); + err.note("the declaration in the trait must be marked with `#[type_const]`"); + return Err(err.emit()); + } + (def_id, args) + } + // FIXME(mgca): implement support for this once ready to support all adt ctor expressions, + // not just const ctors + LoweredAssoc::Variant { .. } => { + span_bug!(span, "unexpected variant res for type associated const path") + } + }; + Ok(Const::new_unevaluated(tcx, ty::UnevaluatedConst::new(def_id, args))) + } + + #[instrument(level = "debug", skip_all, ret)] + fn lower_assoc_path_shared( + &self, + hir_ref_id: HirId, + span: Span, + qself_ty: Ty<'tcx>, + qself: &'tcx hir::Ty<'tcx>, + assoc_segment: &'tcx hir::PathSegment<'tcx>, + mode: LowerAssocMode, + ) -> Result<LoweredAssoc<'tcx>, ErrorGuaranteed> { debug!(%qself_ty, ?assoc_segment.ident); let tcx = self.tcx(); @@ -1141,13 +1243,16 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { .iter() .find(|vd| tcx.hygienic_eq(assoc_ident, vd.ident(tcx), adt_def.did())); if let Some(variant_def) = variant_def { - if permit_variants { + if mode.permit_variants() { tcx.check_stability(variant_def.def_id, Some(hir_ref_id), span, None); let _ = self.prohibit_generic_args( slice::from_ref(assoc_segment).iter(), GenericsArgsErrExtend::EnumVariant { qself, assoc_segment, adt_def }, ); - return Ok((qself_ty, DefKind::Variant, variant_def.def_id)); + return Ok(LoweredAssoc::Variant { + adt: qself_ty, + variant_did: variant_def.def_id, + }); } else { variant_resolution = Some(variant_def.def_id); } @@ -1155,15 +1260,15 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { } // FIXME(inherent_associated_types, #106719): Support self types other than ADTs. - if let Some((ty, did)) = self.probe_inherent_assoc_ty( - assoc_ident, + if let Some((did, args)) = self.probe_inherent_assoc_shared( assoc_segment, adt_def.did(), qself_ty, hir_ref_id, span, + mode.kind(), )? { - return Ok((ty, DefKind::AssocTy, did)); + return Ok(LoweredAssoc::Term(did, args)); } } @@ -1192,7 +1297,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { ) }, AssocItemQSelf::SelfTyAlias, - ty::AssocKind::Type, + mode.kind(), assoc_ident, span, None, @@ -1204,14 +1309,15 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { ) => self.probe_single_ty_param_bound_for_assoc_item( param_did.expect_local(), qself.span, - ty::AssocKind::Type, + mode.kind(), assoc_ident, span, )?, _ => { + let kind_str = assoc_kind_str(mode.kind()); let reported = if variant_resolution.is_some() { // Variant in type position - let msg = format!("expected type, found variant `{assoc_ident}`"); + let msg = format!("expected {kind_str}, found variant `{assoc_ident}`"); self.dcx().span_err(span, msg) } else if qself_ty.is_enum() { let mut err = self.dcx().create_err(NoVariantNamed { @@ -1310,11 +1416,12 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { self.probe_traits_that_match_assoc_ty(qself_ty, assoc_ident); // Don't print `ty::Error` to the user. - self.report_ambiguous_assoc_ty( + self.report_ambiguous_assoc( span, &[qself_ty.to_string()], &traits, assoc_ident.name, + mode.kind(), ) }; return Err(reported); @@ -1322,10 +1429,12 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { }; let trait_did = bound.def_id(); - let assoc_ty = self - .probe_assoc_item(assoc_ident, ty::AssocKind::Type, hir_ref_id, span, trait_did) - .expect("failed to find associated type"); - let ty = self.lower_assoc_ty(span, assoc_ty.def_id, assoc_segment, bound); + let assoc_item = self + .probe_assoc_item(assoc_ident, mode.kind(), hir_ref_id, span, trait_did) + .expect("failed to find associated item"); + let (def_id, args) = + self.lower_assoc_shared(span, assoc_item.def_id, assoc_segment, bound, mode.kind())?; + let result = LoweredAssoc::Term(def_id, args); if let Some(variant_def_id) = variant_resolution { tcx.node_span_lint(AMBIGUOUS_ASSOCIATED_ITEMS, hir_ref_id, span, |lint| { @@ -1341,7 +1450,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { }; could_refer_to(DefKind::Variant, variant_def_id, ""); - could_refer_to(DefKind::AssocTy, assoc_ty.def_id, " also"); + could_refer_to(mode.def_kind(), assoc_item.def_id, " also"); lint.span_suggestion( span, @@ -1351,36 +1460,51 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { ); }); } - Ok((ty, DefKind::AssocTy, assoc_ty.def_id)) + Ok(result) } - fn probe_inherent_assoc_ty( + fn probe_inherent_assoc_shared( &self, - name: Ident, segment: &hir::PathSegment<'tcx>, adt_did: DefId, self_ty: Ty<'tcx>, block: HirId, span: Span, - ) -> Result<Option<(Ty<'tcx>, DefId)>, ErrorGuaranteed> { + kind: ty::AssocKind, + ) -> Result<Option<(DefId, GenericArgsRef<'tcx>)>, ErrorGuaranteed> { let tcx = self.tcx(); - // Don't attempt to look up inherent associated types when the feature is not enabled. - // Theoretically it'd be fine to do so since we feature-gate their definition site. - // However, due to current limitations of the implementation (caused by us performing - // selection during HIR ty lowering instead of in the trait solver), IATs can lead to cycle - // errors (#108491) which mask the feature-gate error, needlessly confusing users - // who use IATs by accident (#113265). if !tcx.features().inherent_associated_types() { - return Ok(None); + match kind { + // Don't attempt to look up inherent associated types when the feature is not enabled. + // Theoretically it'd be fine to do so since we feature-gate their definition site. + // However, due to current limitations of the implementation (caused by us performing + // selection during HIR ty lowering instead of in the trait solver), IATs can lead to cycle + // errors (#108491) which mask the feature-gate error, needlessly confusing users + // who use IATs by accident (#113265). + ty::AssocKind::Type => return Ok(None), + ty::AssocKind::Const => { + // We also gate the mgca codepath for type-level uses of inherent consts + // with the inherent_associated_types feature gate since it relies on the + // same machinery and has similar rough edges. + return Err(feature_err( + &tcx.sess, + sym::inherent_associated_types, + span, + "inherent associated types are unstable", + ) + .emit()); + } + ty::AssocKind::Fn => unreachable!(), + } } + let name = segment.ident; let candidates: Vec<_> = tcx .inherent_impls(adt_did) .iter() .filter_map(|&impl_| { - let (item, scope) = - self.probe_assoc_item_unchecked(name, ty::AssocKind::Type, block, impl_)?; + let (item, scope) = self.probe_assoc_item_unchecked(name, kind, block, impl_)?; Some((impl_, (item.def_id, scope))) }) .collect(); @@ -1395,13 +1519,11 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { // In contexts that have no inference context, just make a new one. // We do need a local variable to store it, though. - let infcx_; let infcx = match self.infcx() { Some(infcx) => infcx, None => { assert!(!self_ty.has_infer()); - infcx_ = tcx.infer_ctxt().ignoring_regions().build(TypingMode::non_body_analysis()); - &infcx_ + &tcx.infer_ctxt().ignoring_regions().build(TypingMode::non_body_analysis()) } }; @@ -1420,8 +1542,8 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { &mut universes, self_ty, |self_ty| { - self.select_inherent_assoc_type_candidates( - infcx, name, span, self_ty, param_env, candidates, + self.select_inherent_assoc_candidates( + infcx, name, span, self_ty, param_env, candidates, kind, ) }, )?; @@ -1438,13 +1560,10 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { .chain(args.into_iter().skip(parent_args.len())), ); - let ty = - Ty::new_alias(tcx, ty::Inherent, ty::AliasTy::new_from_args(tcx, assoc_item, args)); - - Ok(Some((ty, assoc_item))) + Ok(Some((assoc_item, args))) } - fn select_inherent_assoc_type_candidates( + fn select_inherent_assoc_candidates( &self, infcx: &InferCtxt<'tcx>, name: Ident, @@ -1452,6 +1571,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { self_ty: Ty<'tcx>, param_env: ParamEnv<'tcx>, candidates: Vec<(DefId, (DefId, DefId))>, + kind: ty::AssocKind, ) -> Result<(DefId, (DefId, DefId)), ErrorGuaranteed> { let tcx = self.tcx(); let mut fulfillment_errors = Vec::new(); @@ -1496,17 +1616,18 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { .collect(); match &applicable_candidates[..] { - &[] => Err(self.complain_about_inherent_assoc_ty_not_found( + &[] => Err(self.complain_about_inherent_assoc_not_found( name, self_ty, candidates, fulfillment_errors, span, + kind, )), &[applicable_candidate] => Ok(applicable_candidate), - &[_, ..] => Err(self.complain_about_ambiguous_inherent_assoc_ty( + &[_, ..] => Err(self.complain_about_ambiguous_inherent_assoc( name, applicable_candidates.into_iter().map(|(_, (candidate, _))| candidate).collect(), span, @@ -1638,7 +1759,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { /// Lower a qualified path to a type. #[instrument(level = "debug", skip_all)] - fn lower_qpath( + fn lower_qpath_ty( &self, span: Span, opt_self_ty: Option<Ty<'tcx>>, @@ -1646,13 +1767,64 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { trait_segment: &hir::PathSegment<'tcx>, item_segment: &hir::PathSegment<'tcx>, ) -> Ty<'tcx> { + match self.lower_qpath_shared( + span, + opt_self_ty, + item_def_id, + trait_segment, + item_segment, + ty::AssocKind::Type, + ) { + Ok((item_def_id, item_args)) => { + Ty::new_projection_from_args(self.tcx(), item_def_id, item_args) + } + Err(guar) => Ty::new_error(self.tcx(), guar), + } + } + + /// Lower a qualified path to a const. + #[instrument(level = "debug", skip_all)] + fn lower_qpath_const( + &self, + span: Span, + opt_self_ty: Option<Ty<'tcx>>, + item_def_id: DefId, + trait_segment: &hir::PathSegment<'tcx>, + item_segment: &hir::PathSegment<'tcx>, + ) -> Const<'tcx> { + match self.lower_qpath_shared( + span, + opt_self_ty, + item_def_id, + trait_segment, + item_segment, + ty::AssocKind::Const, + ) { + Ok((item_def_id, item_args)) => { + let uv = ty::UnevaluatedConst::new(item_def_id, item_args); + Const::new_unevaluated(self.tcx(), uv) + } + Err(guar) => Const::new_error(self.tcx(), guar), + } + } + + #[instrument(level = "debug", skip_all)] + fn lower_qpath_shared( + &self, + span: Span, + opt_self_ty: Option<Ty<'tcx>>, + item_def_id: DefId, + trait_segment: &hir::PathSegment<'tcx>, + item_segment: &hir::PathSegment<'tcx>, + kind: ty::AssocKind, + ) -> Result<(DefId, GenericArgsRef<'tcx>), ErrorGuaranteed> { let tcx = self.tcx(); let trait_def_id = tcx.parent(item_def_id); debug!(?trait_def_id); let Some(self_ty) = opt_self_ty else { - return self.error_missing_qpath_self_ty(trait_def_id, span, item_segment); + return Err(self.error_missing_qpath_self_ty(trait_def_id, span, item_segment, kind)); }; debug!(?self_ty); @@ -1663,7 +1835,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { let item_args = self.lower_generic_args_of_assoc_item(span, item_def_id, item_segment, trait_ref.args); - Ty::new_projection_from_args(tcx, item_def_id, item_args) + Ok((item_def_id, item_args)) } fn error_missing_qpath_self_ty( @@ -1671,7 +1843,8 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { trait_def_id: DefId, span: Span, item_segment: &hir::PathSegment<'tcx>, - ) -> Ty<'tcx> { + kind: ty::AssocKind, + ) -> ErrorGuaranteed { let tcx = self.tcx(); let path_str = tcx.def_path_str(trait_def_id); @@ -1707,9 +1880,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { // FIXME: also look at `tcx.generics_of(self.item_def_id()).params` any that // references the trait. Relevant for the first case in // `src/test/ui/associated-types/associated-types-in-ambiguous-context.rs` - let reported = - self.report_ambiguous_assoc_ty(span, &type_names, &[path_str], item_segment.ident.name); - Ty::new_error(tcx, reported) + self.report_ambiguous_assoc(span, &type_names, &[path_str], item_segment.ident.name, kind) } pub fn prohibit_generic_args<'a>( @@ -2013,7 +2184,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { path.segments[..path.segments.len() - 2].iter(), GenericsArgsErrExtend::None, ); - self.lower_qpath( + self.lower_qpath_ty( span, opt_self_ty, def_id, @@ -2167,11 +2338,19 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { let opt_self_ty = maybe_qself.as_ref().map(|qself| self.lower_ty(qself)); self.lower_const_path_resolved(opt_self_ty, path, hir_id) } - hir::ConstArgKind::Path(qpath) => ty::Const::new_error_with_message( - tcx, - qpath.span(), - format!("Const::lower_const_arg: invalid qpath {qpath:?}"), - ), + hir::ConstArgKind::Path(hir::QPath::TypeRelative(qself, segment)) => { + debug!(?qself, ?segment); + let ty = self.lower_ty(qself); + self.lower_assoc_path_const(hir_id, const_arg.span(), ty, qself, segment) + .unwrap_or_else(|guar| Const::new_error(tcx, guar)) + } + hir::ConstArgKind::Path(qpath @ hir::QPath::LangItem(..)) => { + ty::Const::new_error_with_message( + tcx, + qpath.span(), + format!("Const::lower_const_arg: invalid qpath {qpath:?}"), + ) + } hir::ConstArgKind::Anon(anon) => self.lower_anon_const(anon), hir::ConstArgKind::Infer(span, ()) => self.ct_infer(None, span), } @@ -2207,6 +2386,20 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { ); ty::Const::new_unevaluated(tcx, ty::UnevaluatedConst::new(did, args)) } + Res::Def(DefKind::AssocConst, did) => { + debug_assert!(path.segments.len() >= 2); + let _ = self.prohibit_generic_args( + path.segments[..path.segments.len() - 2].iter(), + GenericsArgsErrExtend::None, + ); + self.lower_qpath_const( + span, + opt_self_ty, + did, + &path.segments[path.segments.len() - 2], + path.segments.last().unwrap(), + ) + } Res::Def(DefKind::Static { .. }, _) => { span_bug!(span, "use of bare `static` ConstArgKind::Path's not yet supported") } @@ -2223,7 +2416,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { // Exhaustive match to be clear about what exactly we're considering to be // an invalid Res for a const path. - Res::Def( + res @ (Res::Def( DefKind::Mod | DefKind::Enum | DefKind::Variant @@ -2237,7 +2430,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { | DefKind::Union | DefKind::Trait | DefKind::ForeignTy - | DefKind::AssocConst | DefKind::TyParam | DefKind::Macro(_) | DefKind::LifetimeParam @@ -2260,12 +2452,15 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { | Res::Local(_) | Res::ToolMod | Res::NonMacroAttr(_) - | Res::Err => Const::new_error_with_message(tcx, span, "invalid Res for const path"), + | Res::Err) => Const::new_error_with_message( + tcx, + span, + format!("invalid Res {res:?} for const path"), + ), } } - /// Literals and const generic parameters are eagerly converted to a constant, everything else - /// becomes `Unevaluated`. + /// Literals are eagerly converted to a constant, everything else becomes `Unevaluated`. #[instrument(skip(self), level = "debug")] fn lower_anon_const(&self, anon: &AnonConst) -> Const<'tcx> { let tcx = self.tcx(); @@ -2464,7 +2659,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { hir::TyKind::Path(hir::QPath::TypeRelative(qself, segment)) => { debug!(?qself, ?segment); let ty = self.lower_ty(qself); - self.lower_assoc_path(hir_ty.hir_id, hir_ty.span, ty, qself, segment, false) + self.lower_assoc_path_ty(hir_ty.hir_id, hir_ty.span, ty, qself, segment, false) .map(|(ty, _, _)| ty) .unwrap_or_else(|guar| Ty::new_error(tcx, guar)) } @@ -2495,28 +2690,26 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { let ty_span = ty.span; let ty = self.lower_ty(ty); let pat_ty = match pat.kind { - hir::TyPatKind::Range(start, end, include_end) => { - let ty = match ty.kind() { - ty::Int(_) | ty::Uint(_) | ty::Char => ty, - _ => Ty::new_error( - tcx, - self.dcx().emit_err(InvalidBaseType { - ty, - pat: "range", + hir::TyPatKind::Range(start, end) => { + let (ty, start, end) = match ty.kind() { + // Keep this list of types in sync with the list of types that + // the `RangePattern` trait is implemented for. + ty::Int(_) | ty::Uint(_) | ty::Char => { + let start = self.lower_const_arg(start, FeedConstTy::No); + let end = self.lower_const_arg(end, FeedConstTy::No); + (ty, start, end) + } + _ => { + let guar = self.dcx().span_delayed_bug( ty_span, - pat_span: pat.span, - }), - ), - }; - let start = start.map(|expr| self.lower_const_arg(expr, FeedConstTy::No)); - let end = end.map(|expr| self.lower_const_arg(expr, FeedConstTy::No)); - - let include_end = match include_end { - hir::RangeEnd::Included => true, - hir::RangeEnd::Excluded => false, + "invalid base type for range pattern", + ); + let errc = ty::Const::new_error(tcx, guar); + (Ty::new_error(tcx, guar), errc, errc) + } }; - let pat = tcx.mk_pat(ty::PatternKind::Range { start, end, include_end }); + let pat = tcx.mk_pat(ty::PatternKind::Range { start, end }); Ty::new_pat(tcx, ty, pat) } hir::TyPatKind::Err(e) => Ty::new_error(tcx, e), diff --git a/compiler/rustc_hir_analysis/src/lib.rs b/compiler/rustc_hir_analysis/src/lib.rs index cf18bab950a..50b0e32b95e 100644 --- a/compiler/rustc_hir_analysis/src/lib.rs +++ b/compiler/rustc_hir_analysis/src/lib.rs @@ -212,7 +212,10 @@ pub fn check_crate(tcx: TyCtxt<'_>) { tcx.par_hir_body_owners(|item_def_id| { let def_kind = tcx.def_kind(item_def_id); match def_kind { - DefKind::Static { .. } => tcx.ensure_ok().eval_static_initializer(item_def_id), + DefKind::Static { .. } => { + tcx.ensure_ok().eval_static_initializer(item_def_id); + check::maybe_check_static_with_link_section(tcx, item_def_id); + } DefKind::Const if tcx.generics_of(item_def_id).is_empty() => { let instance = ty::Instance::new(item_def_id.into(), ty::GenericArgs::empty()); let cid = GlobalId { instance, promoted: None }; @@ -223,12 +226,9 @@ pub fn check_crate(tcx: TyCtxt<'_>) { } }); - // FIXME: Remove this when we implement creating `DefId`s - // for anon constants during their parents' typeck. - // Typeck all body owners in parallel will produce queries - // cycle errors because it may typeck on anon constants directly. tcx.par_hir_body_owners(|item_def_id| { let def_kind = tcx.def_kind(item_def_id); + // Skip `AnonConst`s because we feed their `type_of`. if !matches!(def_kind, DefKind::AnonConst) { tcx.ensure_ok().typeck(item_def_id); } diff --git a/compiler/rustc_hir_analysis/src/variance/constraints.rs b/compiler/rustc_hir_analysis/src/variance/constraints.rs index e954d2b9ea4..8475903c68f 100644 --- a/compiler/rustc_hir_analysis/src/variance/constraints.rs +++ b/compiler/rustc_hir_analysis/src/variance/constraints.rs @@ -252,13 +252,9 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> { ty::Pat(typ, pat) => { match *pat { - ty::PatternKind::Range { start, end, include_end: _ } => { - if let Some(start) = start { - self.add_constraints_from_const(current, start, variance); - } - if let Some(end) = end { - self.add_constraints_from_const(current, end, variance); - } + ty::PatternKind::Range { start, end } => { + self.add_constraints_from_const(current, start, variance); + self.add_constraints_from_const(current, end, variance); } } self.add_constraints_from_ty(current, typ, variance); |