From 17d40c6057c88f4c432b0d7bac88e1b84cb7e67f Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:03:36 +0200 Subject: Adding upstream version 1.65.0+dfsg1. Signed-off-by: Daniel Baumann --- compiler/rustc_resolve/src/imports.rs | 109 ++++++++++++++++++++++------------ 1 file changed, 71 insertions(+), 38 deletions(-) (limited to 'compiler/rustc_resolve/src/imports.rs') diff --git a/compiler/rustc_resolve/src/imports.rs b/compiler/rustc_resolve/src/imports.rs index b89273990..c133c272b 100644 --- a/compiler/rustc_resolve/src/imports.rs +++ b/compiler/rustc_resolve/src/imports.rs @@ -23,15 +23,13 @@ use rustc_span::lev_distance::find_best_match_for_name; use rustc_span::symbol::{kw, Ident, Symbol}; use rustc_span::Span; -use tracing::*; - use std::cell::Cell; use std::{mem, ptr}; type Res = def::Res; /// Contains data for specific kinds of imports. -#[derive(Clone, Debug)] +#[derive(Clone)] pub enum ImportKind<'a> { Single { /// `source` in `use prefix::source as target`. @@ -52,8 +50,8 @@ pub enum ImportKind<'a> { }, Glob { is_prelude: bool, - max_vis: Cell, // The visibility of the greatest re-export. - // n.b. `max_vis` is only used in `finalize_import` to check for re-export errors. + max_vis: Cell>, // The visibility of the greatest re-export. + // n.b. `max_vis` is only used in `finalize_import` to check for re-export errors. }, ExternCrate { source: Option, @@ -62,6 +60,44 @@ pub enum ImportKind<'a> { MacroUse, } +/// Manually implement `Debug` for `ImportKind` because the `source/target_bindings` +/// contain `Cell`s which can introduce infinite loops while printing. +impl<'a> std::fmt::Debug for ImportKind<'a> { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + use ImportKind::*; + match self { + Single { + ref source, + ref target, + ref type_ns_only, + ref nested, + ref additional_ids, + // Ignore the following to avoid an infinite loop while printing. + source_bindings: _, + target_bindings: _, + } => f + .debug_struct("Single") + .field("source", source) + .field("target", target) + .field("type_ns_only", type_ns_only) + .field("nested", nested) + .field("additional_ids", additional_ids) + .finish_non_exhaustive(), + Glob { ref is_prelude, ref max_vis } => f + .debug_struct("Glob") + .field("is_prelude", is_prelude) + .field("max_vis", max_vis) + .finish(), + ExternCrate { ref source, ref target } => f + .debug_struct("ExternCrate") + .field("source", source) + .field("target", target) + .finish(), + MacroUse => f.debug_struct("MacroUse").finish(), + } + } +} + /// One import. #[derive(Debug, Clone)] pub(crate) struct Import<'a> { @@ -106,7 +142,7 @@ pub(crate) struct Import<'a> { pub module_path: Vec, /// The resolution of `module_path`. pub imported_module: Cell>>, - pub vis: Cell, + pub vis: Cell>, pub used: Cell, } @@ -121,6 +157,10 @@ impl<'a> Import<'a> { _ => false, } } + + pub(crate) fn expect_vis(&self) -> ty::Visibility { + self.vis.get().expect("encountered cleared import visibility") + } } /// Records information about the resolution of a name in a namespace of a module. @@ -161,7 +201,7 @@ fn pub_use_of_private_extern_crate_hack(import: &Import<'_>, binding: &NameBindi import: Import { kind: ImportKind::ExternCrate { .. }, .. }, .. }, - ) => import.vis.get().is_public(), + ) => import.expect_vis().is_public(), _ => false, } } @@ -174,17 +214,20 @@ impl<'a> Resolver<'a> { binding: &'a NameBinding<'a>, import: &'a Import<'a>, ) -> &'a NameBinding<'a> { - let vis = if binding.vis.is_at_least(import.vis.get(), self) + let import_vis = import.expect_vis().to_def_id(); + let vis = if binding.vis.is_at_least(import_vis, self) || pub_use_of_private_extern_crate_hack(import, binding) { - import.vis.get() + import_vis } else { binding.vis }; if let ImportKind::Glob { ref max_vis, .. } = import.kind { - if vis == import.vis.get() || vis.is_at_least(max_vis.get(), self) { - max_vis.set(vis) + if vis == import_vis + || max_vis.get().map_or(true, |max_vis| vis.is_at_least(max_vis, self)) + { + max_vis.set(Some(vis.expect_local())) } } @@ -498,7 +541,7 @@ impl<'a, 'b> ImportResolver<'a, 'b> { } else { // For better failure detection, pretend that the import will // not define any names while resolving its module path. - let orig_vis = import.vis.replace(ty::Visibility::Invisible); + let orig_vis = import.vis.take(); let path_res = self.r.maybe_resolve_path(&import.module_path, None, &import.parent_scope); import.vis.set(orig_vis); @@ -533,7 +576,7 @@ impl<'a, 'b> ImportResolver<'a, 'b> { if let Err(Undetermined) = source_bindings[ns].get() { // For better failure detection, pretend that the import will // not define any names while resolving its module path. - let orig_vis = import.vis.replace(ty::Visibility::Invisible); + let orig_vis = import.vis.take(); let binding = this.resolve_ident_in_module( module, source, @@ -582,7 +625,7 @@ impl<'a, 'b> ImportResolver<'a, 'b> { /// Optionally returns an unresolved import error. This error is buffered and used to /// consolidate multiple unresolved import errors into a single diagnostic. fn finalize_import(&mut self, import: &'b Import<'b>) -> Option { - let orig_vis = import.vis.replace(ty::Visibility::Invisible); + let orig_vis = import.vis.take(); let ignore_binding = match &import.kind { ImportKind::Single { target_bindings, .. } => target_bindings[TypeNS].get(), _ => None, @@ -689,9 +732,9 @@ impl<'a, 'b> ImportResolver<'a, 'b> { }); } } - if !is_prelude && - max_vis.get() != ty::Visibility::Invisible && // Allow empty globs. - !max_vis.get().is_at_least(import.vis.get(), &*self.r) + if !is_prelude + && let Some(max_vis) = max_vis.get() + && !max_vis.is_at_least(import.expect_vis(), &*self.r) { let msg = "glob import doesn't reexport anything because no candidate is public enough"; self.r.lint_buffer.buffer_lint(UNUSED_IMPORTS, import.id, import.span, msg); @@ -704,7 +747,7 @@ impl<'a, 'b> ImportResolver<'a, 'b> { let mut all_ns_err = true; self.r.per_ns(|this, ns| { if !type_ns_only || ns == TypeNS { - let orig_vis = import.vis.replace(ty::Visibility::Invisible); + let orig_vis = import.vis.take(); let binding = this.resolve_ident_in_module( module, ident, @@ -868,8 +911,7 @@ impl<'a, 'b> ImportResolver<'a, 'b> { let mut crate_private_reexport = false; self.r.per_ns(|this, ns| { if let Ok(binding) = source_bindings[ns].get() { - let vis = import.vis.get(); - if !binding.vis.is_at_least(vis, &*this) { + if !binding.vis.is_at_least(import.expect_vis(), &*this) { reexport_error = Some((ns, binding)); if let ty::Visibility::Restricted(binding_def_id) = binding.vis { if binding_def_id.is_top_level_module() { @@ -1091,24 +1133,15 @@ impl<'a, 'b> ImportResolver<'a, 'b> { if let Some(def_id) = module.opt_def_id() { let mut reexports = Vec::new(); - module.for_each_child(self.r, |_, ident, _, binding| { - // FIXME: Consider changing the binding inserted by `#[macro_export] macro_rules` - // into the crate root to actual `NameBindingKind::Import`. - if binding.is_import() - || matches!(binding.kind, NameBindingKind::Res(_, _is_macro_export @ true)) - { - let res = binding.res().expect_non_local(); - // Ambiguous imports are treated as errors at this point and are - // not exposed to other crates (see #36837 for more details). - if res != def::Res::Err && !binding.is_ambiguity() { - reexports.push(ModChild { - ident, - res, - vis: binding.vis, - span: binding.span, - macro_rules: false, - }); - } + module.for_each_child(self.r, |this, ident, _, binding| { + if let Some(res) = this.is_reexport(binding) { + reexports.push(ModChild { + ident, + res, + vis: binding.vis, + span: binding.span, + macro_rules: false, + }); } }); -- cgit v1.2.3