Auto merge of #142687 - cjgillot:less-hir_crate, r=<try>

rust-bors[bot] · web-flow · commit 3e0878b6b3b3 · 2025-06-18T16:58:24.000Z
Reduce uses of `hir_crate`.

I tried rebasing my old incremental-HIR branch. This is a by-product, which is required if we want to get rid of `hir_crate` entirely.

The second commit is a drive-by cleanup. It can be pulled into its own PR.

r? `@oli-obk`

&lt;!-- homu-ignore:start --&gt;
&lt;!--
If this PR is related to an unstable feature or an otherwise tracked effort,
please link to the relevant tracking issue here. If you don't know of a related
tracking issue or there are none, feel free to ignore this.

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diff --git a/compiler/rustc_const_eval/src/check_consts/check.rs b/compiler/rustc_const_eval/src/check_consts/check.rs
@@ -463,12 +463,6 @@ impl<'mir, 'tcx> Checker<'mir, 'tcx> {
         );
     }
 
-    fn crate_inject_span(&self) -> Option<Span> {
-        self.tcx.hir_crate_items(()).definitions().next().and_then(|id| {
-            self.tcx.crate_level_attribute_injection_span(self.tcx.local_def_id_to_hir_id(id))
-        })
-    }
-
     /// Check the const stability of the given item (fn or trait).
     fn check_callee_stability(&mut self, def_id: DefId) {
         match self.tcx.lookup_const_stability(def_id) {
@@ -543,7 +537,6 @@ impl<'mir, 'tcx> Checker<'mir, 'tcx> {
                         feature,
                         feature_enabled,
                         safe_to_expose_on_stable: callee_safe_to_expose_on_stable,
-                        suggestion_span: self.crate_inject_span(),
                         is_function_call: self.tcx.def_kind(def_id) != DefKind::Trait,
                     });
                 }
@@ -919,7 +912,6 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                                 name: intrinsic.name,
                                 feature,
                                 const_stable_indirect: is_const_stable,
-                                suggestion: self.crate_inject_span(),
                             });
                         }
                         Some(attrs::ConstStability {
diff --git a/compiler/rustc_const_eval/src/check_consts/ops.rs b/compiler/rustc_const_eval/src/check_consts/ops.rs
@@ -1,8 +1,8 @@
 //! Concrete error types for all operations which may be invalid in a certain const context.
 
 use hir::{ConstContext, LangItem};
+use rustc_errors::Diag;
 use rustc_errors::codes::*;
-use rustc_errors::{Applicability, Diag};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_infer::infer::TyCtxtInferExt;
@@ -384,7 +384,6 @@ pub(crate) struct CallUnstable {
     /// expose on stable.
     pub feature_enabled: bool,
     pub safe_to_expose_on_stable: bool,
-    pub suggestion_span: Option<Span>,
     /// true if `def_id` is the function we are calling, false if `def_id` is an unstable trait.
     pub is_function_call: bool,
 }
@@ -412,20 +411,7 @@ impl<'tcx> NonConstOp<'tcx> for CallUnstable {
                 def_path: ccx.tcx.def_path_str(self.def_id),
             })
         };
-        // FIXME: make this translatable
-        let msg = format!("add `#![feature({})]` to the crate attributes to enable", self.feature);
-        #[allow(rustc::untranslatable_diagnostic)]
-        if let Some(span) = self.suggestion_span {
-            err.span_suggestion_verbose(
-                span,
-                msg,
-                format!("#![feature({})]\n", self.feature),
-                Applicability::MachineApplicable,
-            );
-        } else {
-            err.help(msg);
-        }
-
+        ccx.tcx.disabled_nightly_features(&mut err, [(String::new(), self.feature)]);
         err
     }
 }
@@ -452,7 +438,6 @@ pub(crate) struct IntrinsicUnstable {
     pub name: Symbol,
     pub feature: Symbol,
     pub const_stable_indirect: bool,
-    pub suggestion: Option<Span>,
 }
 
 impl<'tcx> NonConstOp<'tcx> for IntrinsicUnstable {
@@ -472,8 +457,7 @@ impl<'tcx> NonConstOp<'tcx> for IntrinsicUnstable {
             span,
             name: self.name,
             feature: self.feature,
-            suggestion: self.suggestion,
-            help: self.suggestion.is_none(),
+            suggestion: ccx.tcx.crate_level_attribute_injection_span(),
         })
     }
 }
diff --git a/compiler/rustc_const_eval/src/errors.rs b/compiler/rustc_const_eval/src/errors.rs
@@ -136,9 +136,7 @@ pub(crate) struct UnstableIntrinsic {
         code = "#![feature({feature})]\n",
         applicability = "machine-applicable"
     )]
-    pub suggestion: Option<Span>,
-    #[help(const_eval_unstable_intrinsic_suggestion)]
-    pub help: bool,
+    pub suggestion: Span,
 }
 
 #[derive(Diagnostic)]
diff --git a/compiler/rustc_driver_impl/src/pretty.rs b/compiler/rustc_driver_impl/src/pretty.rs
@@ -292,7 +292,11 @@ pub fn print<'tcx>(sess: &Session, ppm: PpMode, ex: PrintExtra<'tcx>) {
         }
         HirTree => {
             debug!("pretty printing HIR tree");
-            format!("{:#?}", ex.tcx().hir_crate(()))
+            ex.tcx()
+                .hir_crate_items(())
+                .owners()
+                .map(|owner| format!("{:#?} => {:#?}\n", owner, ex.tcx().hir_owner_nodes(owner)))
+                .collect()
         }
         Mir => {
             let mut out = Vec::new();
diff --git a/compiler/rustc_hir_analysis/src/check/mod.rs b/compiler/rustc_hir_analysis/src/check/mod.rs
@@ -303,9 +303,7 @@ fn default_body_is_unstable(
         reason: reason_str,
     });
 
-    let inject_span = item_did
-        .as_local()
-        .and_then(|id| tcx.crate_level_attribute_injection_span(tcx.local_def_id_to_hir_id(id)));
+    let inject_span = item_did.is_local().then(|| tcx.crate_level_attribute_injection_span());
     rustc_session::parse::add_feature_diagnostics_for_issue(
         &mut err,
         &tcx.sess,
diff --git a/compiler/rustc_hir_analysis/src/check/wfcheck.rs b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
@@ -1064,7 +1064,7 @@ fn check_param_wf(tcx: TyCtxt<'_>, param: &hir::GenericParam<'_>) -> Result<(),
                     Ok(..) => Some(vec![(adt_const_params_feature_string, sym::adt_const_params)]),
                 };
                 if let Some(features) = may_suggest_feature {
-                    tcx.disabled_nightly_features(&mut diag, Some(param.hir_id), features);
+                    tcx.disabled_nightly_features(&mut diag, features);
                 }
 
                 Err(diag.emit())
diff --git a/compiler/rustc_hir_typeck/src/errors.rs b/compiler/rustc_hir_typeck/src/errors.rs
@@ -30,8 +30,6 @@ pub(crate) struct BaseExpressionDoubleDot {
     )]
     pub default_field_values_suggestion: Option<Span>,
     #[subdiagnostic]
-    pub default_field_values_help: Option<BaseExpressionDoubleDotEnableDefaultFieldValues>,
-    #[subdiagnostic]
     pub add_expr: Option<BaseExpressionDoubleDotAddExpr>,
     #[subdiagnostic]
     pub remove_dots: Option<BaseExpressionDoubleDotRemove>,
@@ -61,10 +59,6 @@ pub(crate) struct BaseExpressionDoubleDotAddExpr {
     pub span: Span,
 }
 
-#[derive(Subdiagnostic)]
-#[help(hir_typeck_base_expression_double_dot_enable_default_field_values)]
-pub(crate) struct BaseExpressionDoubleDotEnableDefaultFieldValues;
-
 #[derive(Diagnostic)]
 #[diag(hir_typeck_field_multiply_specified_in_initializer, code = E0062)]
 pub(crate) struct FieldMultiplySpecifiedInInitializer {
diff --git a/compiler/rustc_hir_typeck/src/expr.rs b/compiler/rustc_hir_typeck/src/expr.rs
@@ -43,10 +43,9 @@ use crate::Expectation::{self, ExpectCastableToType, ExpectHasType, NoExpectatio
 use crate::coercion::{CoerceMany, DynamicCoerceMany};
 use crate::errors::{
     AddressOfTemporaryTaken, BaseExpressionDoubleDot, BaseExpressionDoubleDotAddExpr,
-    BaseExpressionDoubleDotEnableDefaultFieldValues, BaseExpressionDoubleDotRemove,
-    CantDereference, FieldMultiplySpecifiedInInitializer, FunctionalRecordUpdateOnNonStruct,
-    HelpUseLatestEdition, NakedAsmOutsideNakedFn, NoFieldOnType, NoFieldOnVariant,
-    ReturnLikeStatementKind, ReturnStmtOutsideOfFnBody, StructExprNonExhaustive,
+    BaseExpressionDoubleDotRemove, CantDereference, FieldMultiplySpecifiedInInitializer,
+    FunctionalRecordUpdateOnNonStruct, HelpUseLatestEdition, NakedAsmOutsideNakedFn, NoFieldOnType,
+    NoFieldOnVariant, ReturnLikeStatementKind, ReturnStmtOutsideOfFnBody, StructExprNonExhaustive,
     TypeMismatchFruTypo, YieldExprOutsideOfCoroutine,
 };
 use crate::{
@@ -2158,26 +2157,16 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 }
             }
             if !self.tcx.features().default_field_values() {
-                let sugg = self.tcx.crate_level_attribute_injection_span(expr.hir_id);
+                let sugg = self.tcx.crate_level_attribute_injection_span();
                 self.dcx().emit_err(BaseExpressionDoubleDot {
                     span: span.shrink_to_hi(),
                     // We only mention enabling the feature if this is a nightly rustc *and* the
                     // expression would make sense with the feature enabled.
                     default_field_values_suggestion: if self.tcx.sess.is_nightly_build()
                         && missing_mandatory_fields.is_empty()
                         && !missing_optional_fields.is_empty()
-                        && sugg.is_some()
                     {
-                        sugg
-                    } else {
-                        None
-                    },
-                    default_field_values_help: if self.tcx.sess.is_nightly_build()
-                        && missing_mandatory_fields.is_empty()
-                        && !missing_optional_fields.is_empty()
-                        && sugg.is_none()
-                    {
-                        Some(BaseExpressionDoubleDotEnableDefaultFieldValues)
+                        Some(sugg)
                     } else {
                         None
                     },
diff --git a/compiler/rustc_hir_typeck/src/method/probe.rs b/compiler/rustc_hir_typeck/src/method/probe.rs
@@ -1727,7 +1727,6 @@ impl<'tcx> Pick<'tcx> {
             }
             tcx.disabled_nightly_features(
                 lint,
-                Some(scope_expr_id),
                 self.unstable_candidates.iter().map(|(candidate, feature)| {
                     (format!(" `{}`", tcx.def_path_str(candidate.item.def_id)), *feature)
                 }),
diff --git a/compiler/rustc_interface/src/passes.rs b/compiler/rustc_interface/src/passes.rs
@@ -1012,7 +1012,7 @@ fn run_required_analyses(tcx: TyCtxt<'_>) {
     // Prefetch this to prevent multiple threads from blocking on it later.
     // This is needed since the `hir_id_validator::check_crate` call above is not guaranteed
     // to use `hir_crate`.
-    tcx.ensure_done().hir_crate(());
+    tcx.ensure_done().hir_crate_items(());
 
     let sess = tcx.sess;
     sess.time("misc_checking_1", || {
diff --git a/compiler/rustc_lint/src/expect.rs b/compiler/rustc_lint/src/expect.rs
@@ -1,5 +1,4 @@
 use rustc_data_structures::fx::FxHashSet;
-use rustc_hir::CRATE_OWNER_ID;
 use rustc_middle::lint::LintExpectation;
 use rustc_middle::query::Providers;
 use rustc_middle::ty::TyCtxt;
@@ -18,7 +17,7 @@ fn lint_expectations(tcx: TyCtxt<'_>, (): ()) -> Vec<(LintExpectationId, LintExp
 
     let mut expectations = Vec::new();
 
-    for owner in std::iter::once(CRATE_OWNER_ID).chain(krate.owners()) {
+    for owner in krate.owners() {
         let lints = tcx.shallow_lint_levels_on(owner);
         expectations.extend_from_slice(&lints.expectations);
     }
diff --git a/compiler/rustc_middle/src/hir/map.rs b/compiler/rustc_middle/src/hir/map.rs
@@ -328,8 +328,7 @@ impl<'tcx> TyCtxt<'tcx> {
     }
 
     /// Returns an iterator of the `DefId`s for all body-owners in this
-    /// crate. If you would prefer to iterate over the bodies
-    /// themselves, you can do `self.hir_crate(()).body_ids.iter()`.
+    /// crate.
     #[inline]
     pub fn hir_body_owners(self) -> impl Iterator<Item = LocalDefId> {
         self.hir_crate_items(()).body_owners.iter().copied()
@@ -396,12 +395,11 @@ impl<'tcx> TyCtxt<'tcx> {
     where
         V: Visitor<'tcx>,
     {
-        let krate = self.hir_crate(());
-        for info in krate.owners.iter() {
-            if let MaybeOwner::Owner(info) = info {
-                for attrs in info.attrs.map.values() {
-                    walk_list!(visitor, visit_attribute, *attrs);
-                }
+        let krate = self.hir_crate_items(());
+        for owner in krate.owners() {
+            let attrs = self.hir_attr_map(owner);
+            for attrs in attrs.map.values() {
+                walk_list!(visitor, visit_attribute, *attrs);
             }
         }
         V::Result::output()
@@ -1225,6 +1223,7 @@ pub(super) fn hir_module_items(tcx: TyCtxt<'_>, module_id: LocalModDefId) -> Mod
         ..
     } = collector;
     ModuleItems {
+        add_root: false,
         submodules: submodules.into_boxed_slice(),
         free_items: items.into_boxed_slice(),
         trait_items: trait_items.into_boxed_slice(),
@@ -1260,6 +1259,7 @@ pub(crate) fn hir_crate_items(tcx: TyCtxt<'_>, _: ()) -> ModuleItems {
     } = collector;
 
     ModuleItems {
+        add_root: true,
         submodules: submodules.into_boxed_slice(),
         free_items: items.into_boxed_slice(),
         trait_items: trait_items.into_boxed_slice(),
diff --git a/compiler/rustc_middle/src/hir/mod.rs b/compiler/rustc_middle/src/hir/mod.rs
@@ -24,6 +24,9 @@ use crate::ty::{EarlyBinder, ImplSubject, TyCtxt};
 /// bodies. The Ids are in visitor order. This is used to partition a pass between modules.
 #[derive(Debug, HashStable, Encodable, Decodable)]
 pub struct ModuleItems {
+    /// Whether this represents the whole crate, in which case we need to add `CRATE_OWNER_ID` to
+    /// the iterators if we want to account for the crate root.
+    add_root: bool,
     submodules: Box<[OwnerId]>,
     free_items: Box<[ItemId]>,
     trait_items: Box<[TraitItemId]>,
@@ -66,9 +69,10 @@ impl ModuleItems {
     }
 
     pub fn owners(&self) -> impl Iterator<Item = OwnerId> {
-        self.free_items
-            .iter()
-            .map(|id| id.owner_id)
+        self.add_root
+            .then_some(CRATE_OWNER_ID)
+            .into_iter()
+            .chain(self.free_items.iter().map(|id| id.owner_id))
             .chain(self.trait_items.iter().map(|id| id.owner_id))
             .chain(self.impl_items.iter().map(|id| id.owner_id))
             .chain(self.foreign_items.iter().map(|id| id.owner_id))
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
@@ -2113,7 +2113,7 @@ impl<'tcx> TyCtxt<'tcx> {
     ) -> &'tcx rustc_hir::def_path_hash_map::DefPathHashMap {
         // Create a dependency to the crate to be sure we re-execute this when the amount of
         // definitions change.
-        self.ensure_ok().hir_crate(());
+        self.ensure_ok().hir_crate_items(());
         // Freeze definitions once we start iterating on them, to prevent adding new ones
         // while iterating. If some query needs to add definitions, it should be `ensure`d above.
         self.untracked.definitions.freeze().def_path_hash_to_def_index_map()
@@ -3160,42 +3160,33 @@ impl<'tcx> TyCtxt<'tcx> {
         lint_level(self.sess, lint, level, Some(span.into()), decorate);
     }
 
-    /// Find the crate root and the appropriate span where `use` and outer attributes can be
-    /// inserted at.
-    pub fn crate_level_attribute_injection_span(self, hir_id: HirId) -> Option<Span> {
-        for (_hir_id, node) in self.hir_parent_iter(hir_id) {
-            if let hir::Node::Crate(m) = node {
-                return Some(m.spans.inject_use_span.shrink_to_lo());
-            }
-        }
-        None
+    /// Find the appropriate span where `use` and outer attributes can be inserted at.
+    pub fn crate_level_attribute_injection_span(self) -> Span {
+        let node = self.hir_node(hir::CRATE_HIR_ID);
+        let hir::Node::Crate(m) = node else { bug!() };
+        m.spans.inject_use_span.shrink_to_lo()
     }
 
     pub fn disabled_nightly_features<E: rustc_errors::EmissionGuarantee>(
         self,
         diag: &mut Diag<'_, E>,
-        hir_id: Option<HirId>,
         features: impl IntoIterator<Item = (String, Symbol)>,
     ) {
         if !self.sess.is_nightly_build() {
             return;
         }
 
-        let span = hir_id.and_then(|id| self.crate_level_attribute_injection_span(id));
+        let span = self.crate_level_attribute_injection_span();
         for (desc, feature) in features {
             // FIXME: make this string translatable
             let msg =
                 format!("add `#![feature({feature})]` to the crate attributes to enable{desc}");
-            if let Some(span) = span {
-                diag.span_suggestion_verbose(
-                    span,
-                    msg,
-                    format!("#![feature({feature})]\n"),
-                    Applicability::MaybeIncorrect,
-                );
-            } else {
-                diag.help(msg);
-            }
+            diag.span_suggestion_verbose(
+                span,
+                msg,
+                format!("#![feature({feature})]\n"),
+                Applicability::MaybeIncorrect,
+            );
         }
     }
 
diff --git a/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
@@ -3575,11 +3575,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
             }
             ObligationCauseCode::TrivialBound => {
                 err.help("see issue #48214");
-                tcx.disabled_nightly_features(
-                    err,
-                    Some(tcx.local_def_id_to_hir_id(body_id)),
-                    [(String::new(), sym::trivial_bounds)],
-                );
+                tcx.disabled_nightly_features(err, [(String::new(), sym::trivial_bounds)]);
             }
             ObligationCauseCode::OpaqueReturnType(expr_info) => {
                 let (expr_ty, expr) = if let Some((expr_ty, hir_id)) = expr_info {
diff --git a/src/librustdoc/core.rs b/src/librustdoc/core.rs
@@ -387,8 +387,6 @@ pub(crate) fn run_global_ctxt(
         ctxt.external_traits.insert(sized_trait_did, sized_trait);
     }
 
-    debug!("crate: {:?}", tcx.hir_crate(()));
-
     let mut krate = tcx.sess.time("clean_crate", || clean::krate(&mut ctxt));
 
     if krate.module.doc_value().is_empty() {

Original file line number	Diff line number	Diff line change
`@@ -292,7 +292,11 @@ pub fn print<'tcx>(sess: &Session, ppm: PpMode, ex: PrintExtra<'tcx>) {`
`292`	`292`	`}`
`293`	`293`	`HirTree => {`
`294`	`294`	`debug!("pretty printing HIR tree");`
`295`		`- format!("{:#?}", ex.tcx().hir_crate(()))`
	`295`	`+ ex.tcx()`
	`296`	`+ .hir_crate_items(())`
	`297`	`+ .owners()`
	`298`	`+ .map(\|owner\| format!("{:#?} => {:#?}\n", owner, ex.tcx().hir_owner_nodes(owner)))`
	`299`	`+ .collect()`
`296`	`300`	`}`
`297`	`301`	`Mir => {`
`298`	`302`	`let mut out = Vec::new();`
Original file line number	Diff line number	Diff line change
`@@ -1064,7 +1064,7 @@ fn check_param_wf(tcx: TyCtxt<'_>, param: &hir::GenericParam<'_>) -> Result<(),`
`1064`	`1064`	`Ok(..) => Some(vec![(adt_const_params_feature_string, sym::adt_const_params)]),`
`1065`	`1065`	`};`
`1066`	`1066`	`if let Some(features) = may_suggest_feature {`
`1067`		`- tcx.disabled_nightly_features(&mut diag, Some(param.hir_id), features);`
	`1067`	`+ tcx.disabled_nightly_features(&mut diag, features);`
`1068`	`1068`	`}`
`1069`	`1069`
`1070`	`1070`	`Err(diag.emit())`
Original file line number	Diff line number	Diff line change
`@@ -1727,7 +1727,6 @@ impl<'tcx> Pick<'tcx> {`
`1727`	`1727`	`}`
`1728`	`1728`	`tcx.disabled_nightly_features(`
`1729`	`1729`	`lint,`
`1730`		`- Some(scope_expr_id),`
`1731`	`1730`	`self.unstable_candidates.iter().map(\|(candidate, feature)\| {`
`1732`	`1731`	(format!(" `{}`", tcx.def_path_str(candidate.item.def_id)), *feature)
`1733`	`1732`	`}),`