1547 lines
63 KiB
Rust
1547 lines
63 KiB
Rust
//! After we obtain a fresh AST fragment from a macro, code in this module helps to integrate
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//! that fragment into the module structures that are already partially built.
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//!
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//! Items from the fragment are placed into modules,
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//! unexpanded macros in the fragment are visited and registered.
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//! Imports are also considered items and placed into modules here, but not resolved yet.
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use crate::def_collector::collect_definitions;
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use crate::imports::{Import, ImportKind};
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use crate::macros::{MacroRulesBinding, MacroRulesScope, MacroRulesScopeRef};
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use crate::Namespace::{self, MacroNS, TypeNS, ValueNS};
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use crate::{Determinacy, ExternPreludeEntry, Finalize, Module, ModuleKind, ModuleOrUniformRoot};
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use crate::{
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MacroData, NameBinding, NameBindingKind, ParentScope, PathResult, PerNS, ResolutionError,
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};
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use crate::{Resolver, ResolverArenas, Segment, ToNameBinding, VisResolutionError};
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use rustc_ast::visit::{self, AssocCtxt, Visitor};
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use rustc_ast::{self as ast, AssocItem, AssocItemKind, MetaItemKind, StmtKind};
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use rustc_ast::{Block, Fn, ForeignItem, ForeignItemKind, Impl, Item, ItemKind, NodeId};
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use rustc_attr as attr;
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use rustc_data_structures::sync::Lrc;
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use rustc_errors::{struct_span_err, Applicability};
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use rustc_expand::expand::AstFragment;
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use rustc_hir::def::{self, *};
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use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID};
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use rustc_metadata::creader::LoadedMacro;
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use rustc_middle::bug;
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use rustc_middle::metadata::ModChild;
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use rustc_middle::ty::{self, DefIdTree};
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use rustc_session::cstore::CrateStore;
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use rustc_span::hygiene::{ExpnId, LocalExpnId, MacroKind};
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use rustc_span::source_map::{respan, Spanned};
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use rustc_span::symbol::{kw, sym, Ident, Symbol};
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use rustc_span::Span;
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use std::cell::Cell;
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use std::ptr;
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use tracing::debug;
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type Res = def::Res<NodeId>;
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impl<'a> ToNameBinding<'a> for (Module<'a>, ty::Visibility, Span, LocalExpnId) {
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fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> {
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arenas.alloc_name_binding(NameBinding {
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kind: NameBindingKind::Module(self.0),
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ambiguity: None,
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vis: self.1,
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span: self.2,
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expansion: self.3,
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})
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}
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}
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impl<'a> ToNameBinding<'a> for (Res, ty::Visibility, Span, LocalExpnId) {
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fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> {
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arenas.alloc_name_binding(NameBinding {
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kind: NameBindingKind::Res(self.0, false),
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ambiguity: None,
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vis: self.1,
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span: self.2,
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expansion: self.3,
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})
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}
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}
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struct IsMacroExport;
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impl<'a> ToNameBinding<'a> for (Res, ty::Visibility, Span, LocalExpnId, IsMacroExport) {
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fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> {
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arenas.alloc_name_binding(NameBinding {
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kind: NameBindingKind::Res(self.0, true),
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ambiguity: None,
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vis: self.1,
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span: self.2,
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expansion: self.3,
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})
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}
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}
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impl<'a> Resolver<'a> {
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/// Defines `name` in namespace `ns` of module `parent` to be `def` if it is not yet defined;
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/// otherwise, reports an error.
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pub(crate) fn define<T>(&mut self, parent: Module<'a>, ident: Ident, ns: Namespace, def: T)
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where
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T: ToNameBinding<'a>,
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{
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let binding = def.to_name_binding(self.arenas);
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let key = self.new_key(ident, ns);
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if let Err(old_binding) = self.try_define(parent, key, binding) {
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self.report_conflict(parent, ident, ns, old_binding, &binding);
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}
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}
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/// Walks up the tree of definitions starting at `def_id`,
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/// stopping at the first encountered module.
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/// Parent block modules for arbitrary def-ids are not recorded for the local crate,
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/// and are not preserved in metadata for foreign crates, so block modules are never
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/// returned by this function.
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///
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/// For the local crate ignoring block modules may be incorrect, so use this method with care.
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///
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/// For foreign crates block modules can be ignored without introducing observable differences,
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/// moreover they has to be ignored right now because they are not kept in metadata.
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/// Foreign parent modules are used for resolving names used by foreign macros with def-site
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/// hygiene, therefore block module ignorability relies on macros with def-site hygiene and
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/// block module parents being unreachable from other crates.
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/// Reachable macros with block module parents exist due to `#[macro_export] macro_rules!`,
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/// but they cannot use def-site hygiene, so the assumption holds
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/// (<https://github.com/rust-lang/rust/pull/77984#issuecomment-712445508>).
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pub fn get_nearest_non_block_module(&mut self, mut def_id: DefId) -> Module<'a> {
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loop {
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match self.get_module(def_id) {
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Some(module) => return module,
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None => def_id = self.parent(def_id),
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}
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}
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}
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pub fn expect_module(&mut self, def_id: DefId) -> Module<'a> {
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self.get_module(def_id).expect("argument `DefId` is not a module")
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}
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/// If `def_id` refers to a module (in resolver's sense, i.e. a module item, crate root, enum,
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/// or trait), then this function returns that module's resolver representation, otherwise it
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/// returns `None`.
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pub(crate) fn get_module(&mut self, def_id: DefId) -> Option<Module<'a>> {
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if let module @ Some(..) = self.module_map.get(&def_id) {
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return module.copied();
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}
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if !def_id.is_local() {
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let def_kind = self.cstore().def_kind(def_id);
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match def_kind {
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DefKind::Mod | DefKind::Enum | DefKind::Trait => {
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let def_key = self.cstore().def_key(def_id);
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let parent = def_key.parent.map(|index| {
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self.get_nearest_non_block_module(DefId { index, krate: def_id.krate })
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});
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let name = if let Some(cnum) = def_id.as_crate_root() {
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self.cstore().crate_name(cnum)
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} else {
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def_key.disambiguated_data.data.get_opt_name().expect("module without name")
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};
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Some(self.new_module(
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parent,
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ModuleKind::Def(def_kind, def_id, name),
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self.cstore().module_expansion_untracked(def_id, &self.session),
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self.cstore().get_span_untracked(def_id, &self.session),
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// FIXME: Account for `#[no_implicit_prelude]` attributes.
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parent.map_or(false, |module| module.no_implicit_prelude),
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))
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}
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_ => None,
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}
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} else {
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None
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}
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}
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pub(crate) fn expn_def_scope(&mut self, expn_id: ExpnId) -> Module<'a> {
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match expn_id.expn_data().macro_def_id {
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Some(def_id) => self.macro_def_scope(def_id),
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None => expn_id
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.as_local()
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.and_then(|expn_id| self.ast_transform_scopes.get(&expn_id))
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.unwrap_or(&self.graph_root),
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}
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}
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pub(crate) fn macro_def_scope(&mut self, def_id: DefId) -> Module<'a> {
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if let Some(id) = def_id.as_local() {
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self.local_macro_def_scopes[&id]
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} else {
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self.get_nearest_non_block_module(def_id)
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}
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}
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pub(crate) fn get_macro(&mut self, res: Res) -> Option<MacroData> {
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match res {
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Res::Def(DefKind::Macro(..), def_id) => Some(self.get_macro_by_def_id(def_id)),
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Res::NonMacroAttr(_) => {
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Some(MacroData { ext: self.non_macro_attr.clone(), macro_rules: false })
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}
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_ => None,
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}
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}
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pub(crate) fn get_macro_by_def_id(&mut self, def_id: DefId) -> MacroData {
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if let Some(macro_data) = self.macro_map.get(&def_id) {
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return macro_data.clone();
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}
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let (ext, macro_rules) = match self.cstore().load_macro_untracked(def_id, &self.session) {
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LoadedMacro::MacroDef(item, edition) => (
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Lrc::new(self.compile_macro(&item, edition).0),
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matches!(item.kind, ItemKind::MacroDef(def) if def.macro_rules),
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),
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LoadedMacro::ProcMacro(extz) => (Lrc::new(extz), false),
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};
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let macro_data = MacroData { ext, macro_rules };
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self.macro_map.insert(def_id, macro_data.clone());
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macro_data
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}
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pub(crate) fn build_reduced_graph(
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&mut self,
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fragment: &AstFragment,
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parent_scope: ParentScope<'a>,
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) -> MacroRulesScopeRef<'a> {
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collect_definitions(self, fragment, parent_scope.expansion);
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let mut visitor = BuildReducedGraphVisitor { r: self, parent_scope };
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fragment.visit_with(&mut visitor);
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visitor.parent_scope.macro_rules
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}
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pub(crate) fn build_reduced_graph_external(&mut self, module: Module<'a>) {
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for child in self.cstore().module_children_untracked(module.def_id(), self.session) {
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let parent_scope = ParentScope::module(module, self);
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BuildReducedGraphVisitor { r: self, parent_scope }
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.build_reduced_graph_for_external_crate_res(child);
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}
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}
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}
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struct BuildReducedGraphVisitor<'a, 'b> {
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r: &'b mut Resolver<'a>,
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parent_scope: ParentScope<'a>,
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}
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impl<'a> AsMut<Resolver<'a>> for BuildReducedGraphVisitor<'a, '_> {
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fn as_mut(&mut self) -> &mut Resolver<'a> {
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self.r
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}
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}
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impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
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fn resolve_visibility(&mut self, vis: &ast::Visibility) -> ty::Visibility {
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self.try_resolve_visibility(vis, true).unwrap_or_else(|err| {
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self.r.report_vis_error(err);
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ty::Visibility::Public
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})
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}
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fn try_resolve_visibility<'ast>(
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&mut self,
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vis: &'ast ast::Visibility,
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finalize: bool,
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) -> Result<ty::Visibility, VisResolutionError<'ast>> {
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let parent_scope = &self.parent_scope;
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match vis.kind {
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ast::VisibilityKind::Public => Ok(ty::Visibility::Public),
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ast::VisibilityKind::Inherited => {
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Ok(match self.parent_scope.module.kind {
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// Any inherited visibility resolved directly inside an enum or trait
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// (i.e. variants, fields, and trait items) inherits from the visibility
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// of the enum or trait.
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ModuleKind::Def(DefKind::Enum | DefKind::Trait, def_id, _) => {
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self.r.visibilities[&def_id.expect_local()]
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}
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// Otherwise, the visibility is restricted to the nearest parent `mod` item.
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_ => ty::Visibility::Restricted(self.parent_scope.module.nearest_parent_mod()),
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})
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}
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ast::VisibilityKind::Restricted { ref path, id, .. } => {
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// Make `PRIVATE_IN_PUBLIC` lint a hard error.
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self.r.has_pub_restricted = true;
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// For visibilities we are not ready to provide correct implementation of "uniform
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// paths" right now, so on 2018 edition we only allow module-relative paths for now.
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// On 2015 edition visibilities are resolved as crate-relative by default,
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// so we are prepending a root segment if necessary.
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let ident = path.segments.get(0).expect("empty path in visibility").ident;
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let crate_root = if ident.is_path_segment_keyword() {
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None
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} else if ident.span.rust_2015() {
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Some(Segment::from_ident(Ident::new(
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kw::PathRoot,
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path.span.shrink_to_lo().with_ctxt(ident.span.ctxt()),
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)))
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} else {
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return Err(VisResolutionError::Relative2018(ident.span, path));
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};
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let segments = crate_root
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.into_iter()
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.chain(path.segments.iter().map(|seg| seg.into()))
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.collect::<Vec<_>>();
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let expected_found_error = |res| {
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Err(VisResolutionError::ExpectedFound(
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path.span,
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Segment::names_to_string(&segments),
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res,
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))
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};
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match self.r.resolve_path(
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&segments,
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Some(TypeNS),
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parent_scope,
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finalize.then(|| Finalize::new(id, path.span)),
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None,
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) {
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PathResult::Module(ModuleOrUniformRoot::Module(module)) => {
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let res = module.res().expect("visibility resolved to unnamed block");
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if finalize {
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self.r.record_partial_res(id, PartialRes::new(res));
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}
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if module.is_normal() {
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if res == Res::Err {
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Ok(ty::Visibility::Public)
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} else {
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let vis = ty::Visibility::Restricted(res.def_id());
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if self.r.is_accessible_from(vis, parent_scope.module) {
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Ok(vis)
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} else {
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Err(VisResolutionError::AncestorOnly(path.span))
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}
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}
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} else {
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expected_found_error(res)
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}
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}
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PathResult::Module(..) => Err(VisResolutionError::ModuleOnly(path.span)),
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PathResult::NonModule(partial_res) => {
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expected_found_error(partial_res.base_res())
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}
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PathResult::Failed { span, label, suggestion, .. } => {
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Err(VisResolutionError::FailedToResolve(span, label, suggestion))
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}
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PathResult::Indeterminate => Err(VisResolutionError::Indeterminate(path.span)),
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}
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}
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}
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}
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fn insert_field_names_local(&mut self, def_id: DefId, vdata: &ast::VariantData) {
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let field_names = vdata
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.fields()
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.iter()
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.map(|field| respan(field.span, field.ident.map_or(kw::Empty, |ident| ident.name)))
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.collect();
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self.insert_field_names(def_id, field_names);
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}
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fn insert_field_names(&mut self, def_id: DefId, field_names: Vec<Spanned<Symbol>>) {
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self.r.field_names.insert(def_id, field_names);
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}
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fn block_needs_anonymous_module(&mut self, block: &Block) -> bool {
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// If any statements are items, we need to create an anonymous module
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block
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.stmts
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.iter()
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.any(|statement| matches!(statement.kind, StmtKind::Item(_) | StmtKind::MacCall(_)))
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}
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// Add an import to the current module.
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fn add_import(
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&mut self,
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module_path: Vec<Segment>,
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kind: ImportKind<'a>,
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span: Span,
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id: NodeId,
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item: &ast::Item,
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root_span: Span,
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root_id: NodeId,
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vis: ty::Visibility,
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) {
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let current_module = self.parent_scope.module;
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let import = self.r.arenas.alloc_import(Import {
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kind,
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parent_scope: self.parent_scope,
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module_path,
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imported_module: Cell::new(None),
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span,
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id,
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use_span: item.span,
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use_span_with_attributes: item.span_with_attributes(),
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has_attributes: !item.attrs.is_empty(),
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root_span,
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root_id,
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vis: Cell::new(vis),
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used: Cell::new(false),
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});
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|
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self.r.indeterminate_imports.push(import);
|
|
match import.kind {
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|
// Don't add unresolved underscore imports to modules
|
|
ImportKind::Single { target: Ident { name: kw::Underscore, .. }, .. } => {}
|
|
ImportKind::Single { target, type_ns_only, .. } => {
|
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self.r.per_ns(|this, ns| {
|
|
if !type_ns_only || ns == TypeNS {
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|
let key = this.new_key(target, ns);
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|
let mut resolution = this.resolution(current_module, key).borrow_mut();
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resolution.add_single_import(import);
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|
}
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});
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|
}
|
|
// We don't add prelude imports to the globs since they only affect lexical scopes,
|
|
// which are not relevant to import resolution.
|
|
ImportKind::Glob { is_prelude: true, .. } => {}
|
|
ImportKind::Glob { .. } => current_module.globs.borrow_mut().push(import),
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
|
|
fn build_reduced_graph_for_use_tree(
|
|
&mut self,
|
|
// This particular use tree
|
|
use_tree: &ast::UseTree,
|
|
id: NodeId,
|
|
parent_prefix: &[Segment],
|
|
nested: bool,
|
|
// The whole `use` item
|
|
item: &Item,
|
|
vis: ty::Visibility,
|
|
root_span: Span,
|
|
) {
|
|
debug!(
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|
"build_reduced_graph_for_use_tree(parent_prefix={:?}, use_tree={:?}, nested={})",
|
|
parent_prefix, use_tree, nested
|
|
);
|
|
|
|
let mut prefix_iter = parent_prefix
|
|
.iter()
|
|
.cloned()
|
|
.chain(use_tree.prefix.segments.iter().map(|seg| seg.into()))
|
|
.peekable();
|
|
|
|
// On 2015 edition imports are resolved as crate-relative by default,
|
|
// so prefixes are prepended with crate root segment if necessary.
|
|
// The root is prepended lazily, when the first non-empty prefix or terminating glob
|
|
// appears, so imports in braced groups can have roots prepended independently.
|
|
let is_glob = matches!(use_tree.kind, ast::UseTreeKind::Glob);
|
|
let crate_root = match prefix_iter.peek() {
|
|
Some(seg) if !seg.ident.is_path_segment_keyword() && seg.ident.span.rust_2015() => {
|
|
Some(seg.ident.span.ctxt())
|
|
}
|
|
None if is_glob && use_tree.span.rust_2015() => Some(use_tree.span.ctxt()),
|
|
_ => None,
|
|
}
|
|
.map(|ctxt| {
|
|
Segment::from_ident(Ident::new(
|
|
kw::PathRoot,
|
|
use_tree.prefix.span.shrink_to_lo().with_ctxt(ctxt),
|
|
))
|
|
});
|
|
|
|
let prefix = crate_root.into_iter().chain(prefix_iter).collect::<Vec<_>>();
|
|
debug!("build_reduced_graph_for_use_tree: prefix={:?}", prefix);
|
|
|
|
let empty_for_self = |prefix: &[Segment]| {
|
|
prefix.is_empty() || prefix.len() == 1 && prefix[0].ident.name == kw::PathRoot
|
|
};
|
|
match use_tree.kind {
|
|
ast::UseTreeKind::Simple(rename, id1, id2) => {
|
|
let mut ident = use_tree.ident();
|
|
let mut module_path = prefix;
|
|
let mut source = module_path.pop().unwrap();
|
|
let mut type_ns_only = false;
|
|
|
|
self.r.visibilities.insert(self.r.local_def_id(id), vis);
|
|
if id1 != ast::DUMMY_NODE_ID {
|
|
self.r.visibilities.insert(self.r.local_def_id(id1), vis);
|
|
}
|
|
if id2 != ast::DUMMY_NODE_ID {
|
|
self.r.visibilities.insert(self.r.local_def_id(id2), vis);
|
|
}
|
|
|
|
if nested {
|
|
// Correctly handle `self`
|
|
if source.ident.name == kw::SelfLower {
|
|
type_ns_only = true;
|
|
|
|
if empty_for_self(&module_path) {
|
|
self.r.report_error(
|
|
use_tree.span,
|
|
ResolutionError::SelfImportOnlyInImportListWithNonEmptyPrefix,
|
|
);
|
|
return;
|
|
}
|
|
|
|
// Replace `use foo::{ self };` with `use foo;`
|
|
source = module_path.pop().unwrap();
|
|
if rename.is_none() {
|
|
ident = source.ident;
|
|
}
|
|
}
|
|
} else {
|
|
// Disallow `self`
|
|
if source.ident.name == kw::SelfLower {
|
|
let parent = module_path.last();
|
|
|
|
let span = match parent {
|
|
// only `::self` from `use foo::self as bar`
|
|
Some(seg) => seg.ident.span.shrink_to_hi().to(source.ident.span),
|
|
None => source.ident.span,
|
|
};
|
|
let span_with_rename = match rename {
|
|
// only `self as bar` from `use foo::self as bar`
|
|
Some(rename) => source.ident.span.to(rename.span),
|
|
None => source.ident.span,
|
|
};
|
|
self.r.report_error(
|
|
span,
|
|
ResolutionError::SelfImportsOnlyAllowedWithin {
|
|
root: parent.is_none(),
|
|
span_with_rename,
|
|
},
|
|
);
|
|
|
|
// Error recovery: replace `use foo::self;` with `use foo;`
|
|
if let Some(parent) = module_path.pop() {
|
|
source = parent;
|
|
if rename.is_none() {
|
|
ident = source.ident;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Disallow `use $crate;`
|
|
if source.ident.name == kw::DollarCrate && module_path.is_empty() {
|
|
let crate_root = self.r.resolve_crate_root(source.ident);
|
|
let crate_name = match crate_root.kind {
|
|
ModuleKind::Def(.., name) => name,
|
|
ModuleKind::Block => unreachable!(),
|
|
};
|
|
// HACK(eddyb) unclear how good this is, but keeping `$crate`
|
|
// in `source` breaks `src/test/ui/imports/import-crate-var.rs`,
|
|
// while the current crate doesn't have a valid `crate_name`.
|
|
if crate_name != kw::Empty {
|
|
// `crate_name` should not be interpreted as relative.
|
|
module_path.push(Segment::from_ident_and_id(
|
|
Ident { name: kw::PathRoot, span: source.ident.span },
|
|
self.r.next_node_id(),
|
|
));
|
|
source.ident.name = crate_name;
|
|
}
|
|
if rename.is_none() {
|
|
ident.name = crate_name;
|
|
}
|
|
|
|
self.r
|
|
.session
|
|
.struct_span_err(item.span, "`$crate` may not be imported")
|
|
.emit();
|
|
}
|
|
}
|
|
|
|
if ident.name == kw::Crate {
|
|
self.r.session.span_err(
|
|
ident.span,
|
|
"crate root imports need to be explicitly named: \
|
|
`use crate as name;`",
|
|
);
|
|
}
|
|
|
|
let kind = ImportKind::Single {
|
|
source: source.ident,
|
|
target: ident,
|
|
source_bindings: PerNS {
|
|
type_ns: Cell::new(Err(Determinacy::Undetermined)),
|
|
value_ns: Cell::new(Err(Determinacy::Undetermined)),
|
|
macro_ns: Cell::new(Err(Determinacy::Undetermined)),
|
|
},
|
|
target_bindings: PerNS {
|
|
type_ns: Cell::new(None),
|
|
value_ns: Cell::new(None),
|
|
macro_ns: Cell::new(None),
|
|
},
|
|
type_ns_only,
|
|
nested,
|
|
additional_ids: (id1, id2),
|
|
};
|
|
|
|
self.add_import(
|
|
module_path,
|
|
kind,
|
|
use_tree.span,
|
|
id,
|
|
item,
|
|
root_span,
|
|
item.id,
|
|
vis,
|
|
);
|
|
}
|
|
ast::UseTreeKind::Glob => {
|
|
let kind = ImportKind::Glob {
|
|
is_prelude: self.r.session.contains_name(&item.attrs, sym::prelude_import),
|
|
max_vis: Cell::new(ty::Visibility::Invisible),
|
|
};
|
|
self.r.visibilities.insert(self.r.local_def_id(id), vis);
|
|
self.add_import(prefix, kind, use_tree.span, id, item, root_span, item.id, vis);
|
|
}
|
|
ast::UseTreeKind::Nested(ref items) => {
|
|
// Ensure there is at most one `self` in the list
|
|
let self_spans = items
|
|
.iter()
|
|
.filter_map(|&(ref use_tree, _)| {
|
|
if let ast::UseTreeKind::Simple(..) = use_tree.kind {
|
|
if use_tree.ident().name == kw::SelfLower {
|
|
return Some(use_tree.span);
|
|
}
|
|
}
|
|
|
|
None
|
|
})
|
|
.collect::<Vec<_>>();
|
|
if self_spans.len() > 1 {
|
|
let mut e = self.r.into_struct_error(
|
|
self_spans[0],
|
|
ResolutionError::SelfImportCanOnlyAppearOnceInTheList,
|
|
);
|
|
|
|
for other_span in self_spans.iter().skip(1) {
|
|
e.span_label(*other_span, "another `self` import appears here");
|
|
}
|
|
|
|
e.emit();
|
|
}
|
|
|
|
for &(ref tree, id) in items {
|
|
self.build_reduced_graph_for_use_tree(
|
|
// This particular use tree
|
|
tree, id, &prefix, true, // The whole `use` item
|
|
item, vis, root_span,
|
|
);
|
|
}
|
|
|
|
// Empty groups `a::b::{}` are turned into synthetic `self` imports
|
|
// `a::b::c::{self as _}`, so that their prefixes are correctly
|
|
// resolved and checked for privacy/stability/etc.
|
|
if items.is_empty() && !empty_for_self(&prefix) {
|
|
let new_span = prefix[prefix.len() - 1].ident.span;
|
|
let tree = ast::UseTree {
|
|
prefix: ast::Path::from_ident(Ident::new(kw::SelfLower, new_span)),
|
|
kind: ast::UseTreeKind::Simple(
|
|
Some(Ident::new(kw::Underscore, new_span)),
|
|
ast::DUMMY_NODE_ID,
|
|
ast::DUMMY_NODE_ID,
|
|
),
|
|
span: use_tree.span,
|
|
};
|
|
self.build_reduced_graph_for_use_tree(
|
|
// This particular use tree
|
|
&tree,
|
|
id,
|
|
&prefix,
|
|
true,
|
|
// The whole `use` item
|
|
item,
|
|
ty::Visibility::Invisible,
|
|
root_span,
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Constructs the reduced graph for one item.
|
|
fn build_reduced_graph_for_item(&mut self, item: &'b Item) {
|
|
let parent_scope = &self.parent_scope;
|
|
let parent = parent_scope.module;
|
|
let expansion = parent_scope.expansion;
|
|
let ident = item.ident;
|
|
let sp = item.span;
|
|
let vis = self.resolve_visibility(&item.vis);
|
|
let local_def_id = self.r.local_def_id(item.id);
|
|
let def_id = local_def_id.to_def_id();
|
|
|
|
self.r.visibilities.insert(local_def_id, vis);
|
|
|
|
match item.kind {
|
|
ItemKind::Use(ref use_tree) => {
|
|
self.build_reduced_graph_for_use_tree(
|
|
// This particular use tree
|
|
use_tree,
|
|
item.id,
|
|
&[],
|
|
false,
|
|
// The whole `use` item
|
|
item,
|
|
vis,
|
|
use_tree.span,
|
|
);
|
|
}
|
|
|
|
ItemKind::ExternCrate(orig_name) => {
|
|
self.build_reduced_graph_for_extern_crate(
|
|
orig_name,
|
|
item,
|
|
local_def_id,
|
|
vis,
|
|
parent,
|
|
);
|
|
}
|
|
|
|
ItemKind::Mod(..) => {
|
|
let module = self.r.new_module(
|
|
Some(parent),
|
|
ModuleKind::Def(DefKind::Mod, def_id, ident.name),
|
|
expansion.to_expn_id(),
|
|
item.span,
|
|
parent.no_implicit_prelude
|
|
|| self.r.session.contains_name(&item.attrs, sym::no_implicit_prelude),
|
|
);
|
|
self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion));
|
|
|
|
// Descend into the module.
|
|
self.parent_scope.module = module;
|
|
}
|
|
|
|
// These items live in the value namespace.
|
|
ItemKind::Static(_, mt, _) => {
|
|
let res = Res::Def(DefKind::Static(mt), def_id);
|
|
self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion));
|
|
}
|
|
ItemKind::Const(..) => {
|
|
let res = Res::Def(DefKind::Const, def_id);
|
|
self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion));
|
|
}
|
|
ItemKind::Fn(..) => {
|
|
let res = Res::Def(DefKind::Fn, def_id);
|
|
self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion));
|
|
|
|
// Functions introducing procedural macros reserve a slot
|
|
// in the macro namespace as well (see #52225).
|
|
self.define_macro(item);
|
|
}
|
|
|
|
// These items live in the type namespace.
|
|
ItemKind::TyAlias(..) => {
|
|
let res = Res::Def(DefKind::TyAlias, def_id);
|
|
self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
|
|
}
|
|
|
|
ItemKind::Enum(_, _) => {
|
|
let module = self.r.new_module(
|
|
Some(parent),
|
|
ModuleKind::Def(DefKind::Enum, def_id, ident.name),
|
|
expansion.to_expn_id(),
|
|
item.span,
|
|
parent.no_implicit_prelude,
|
|
);
|
|
self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion));
|
|
self.parent_scope.module = module;
|
|
}
|
|
|
|
ItemKind::TraitAlias(..) => {
|
|
let res = Res::Def(DefKind::TraitAlias, def_id);
|
|
self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
|
|
}
|
|
|
|
// These items live in both the type and value namespaces.
|
|
ItemKind::Struct(ref vdata, _) => {
|
|
// Define a name in the type namespace.
|
|
let res = Res::Def(DefKind::Struct, def_id);
|
|
self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
|
|
|
|
// Record field names for error reporting.
|
|
self.insert_field_names_local(def_id, vdata);
|
|
|
|
// If this is a tuple or unit struct, define a name
|
|
// in the value namespace as well.
|
|
if let Some(ctor_node_id) = vdata.ctor_id() {
|
|
// If the structure is marked as non_exhaustive then lower the visibility
|
|
// to within the crate.
|
|
let mut ctor_vis = if vis == ty::Visibility::Public
|
|
&& self.r.session.contains_name(&item.attrs, sym::non_exhaustive)
|
|
{
|
|
ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())
|
|
} else {
|
|
vis
|
|
};
|
|
|
|
let mut ret_fields = Vec::with_capacity(vdata.fields().len());
|
|
|
|
for field in vdata.fields() {
|
|
// NOTE: The field may be an expansion placeholder, but expansion sets
|
|
// correct visibilities for unnamed field placeholders specifically, so the
|
|
// constructor visibility should still be determined correctly.
|
|
let field_vis = self
|
|
.try_resolve_visibility(&field.vis, false)
|
|
.unwrap_or(ty::Visibility::Public);
|
|
if ctor_vis.is_at_least(field_vis, &*self.r) {
|
|
ctor_vis = field_vis;
|
|
}
|
|
ret_fields.push(field_vis);
|
|
}
|
|
let ctor_def_id = self.r.local_def_id(ctor_node_id);
|
|
let ctor_res = Res::Def(
|
|
DefKind::Ctor(CtorOf::Struct, CtorKind::from_ast(vdata)),
|
|
ctor_def_id.to_def_id(),
|
|
);
|
|
self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, sp, expansion));
|
|
self.r.visibilities.insert(ctor_def_id, ctor_vis);
|
|
|
|
self.r.struct_constructors.insert(def_id, (ctor_res, ctor_vis, ret_fields));
|
|
}
|
|
}
|
|
|
|
ItemKind::Union(ref vdata, _) => {
|
|
let res = Res::Def(DefKind::Union, def_id);
|
|
self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
|
|
|
|
// Record field names for error reporting.
|
|
self.insert_field_names_local(def_id, vdata);
|
|
}
|
|
|
|
ItemKind::Trait(..) => {
|
|
// Add all the items within to a new module.
|
|
let module = self.r.new_module(
|
|
Some(parent),
|
|
ModuleKind::Def(DefKind::Trait, def_id, ident.name),
|
|
expansion.to_expn_id(),
|
|
item.span,
|
|
parent.no_implicit_prelude,
|
|
);
|
|
self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion));
|
|
self.parent_scope.module = module;
|
|
}
|
|
|
|
// These items do not add names to modules.
|
|
ItemKind::Impl(box Impl { of_trait: Some(..), .. }) => {
|
|
self.r.trait_impl_items.insert(local_def_id);
|
|
}
|
|
ItemKind::Impl { .. } | ItemKind::ForeignMod(..) | ItemKind::GlobalAsm(..) => {}
|
|
|
|
ItemKind::MacroDef(..) | ItemKind::MacCall(_) => unreachable!(),
|
|
}
|
|
}
|
|
|
|
fn build_reduced_graph_for_extern_crate(
|
|
&mut self,
|
|
orig_name: Option<Symbol>,
|
|
item: &Item,
|
|
local_def_id: LocalDefId,
|
|
vis: ty::Visibility,
|
|
parent: Module<'a>,
|
|
) {
|
|
let ident = item.ident;
|
|
let sp = item.span;
|
|
let parent_scope = self.parent_scope;
|
|
let expansion = parent_scope.expansion;
|
|
|
|
let (used, module, binding) = if orig_name.is_none() && ident.name == kw::SelfLower {
|
|
self.r
|
|
.session
|
|
.struct_span_err(item.span, "`extern crate self;` requires renaming")
|
|
.span_suggestion(
|
|
item.span,
|
|
"rename the `self` crate to be able to import it",
|
|
"extern crate self as name;",
|
|
Applicability::HasPlaceholders,
|
|
)
|
|
.emit();
|
|
return;
|
|
} else if orig_name == Some(kw::SelfLower) {
|
|
Some(self.r.graph_root)
|
|
} else {
|
|
self.r.crate_loader.process_extern_crate(item, &self.r.definitions, local_def_id).map(
|
|
|crate_id| {
|
|
self.r.extern_crate_map.insert(local_def_id, crate_id);
|
|
self.r.expect_module(crate_id.as_def_id())
|
|
},
|
|
)
|
|
}
|
|
.map(|module| {
|
|
let used = self.process_macro_use_imports(item, module);
|
|
let binding =
|
|
(module, ty::Visibility::Public, sp, expansion).to_name_binding(self.r.arenas);
|
|
(used, Some(ModuleOrUniformRoot::Module(module)), binding)
|
|
})
|
|
.unwrap_or((true, None, self.r.dummy_binding));
|
|
let import = self.r.arenas.alloc_import(Import {
|
|
kind: ImportKind::ExternCrate { source: orig_name, target: ident },
|
|
root_id: item.id,
|
|
id: item.id,
|
|
parent_scope: self.parent_scope,
|
|
imported_module: Cell::new(module),
|
|
has_attributes: !item.attrs.is_empty(),
|
|
use_span_with_attributes: item.span_with_attributes(),
|
|
use_span: item.span,
|
|
root_span: item.span,
|
|
span: item.span,
|
|
module_path: Vec::new(),
|
|
vis: Cell::new(vis),
|
|
used: Cell::new(used),
|
|
});
|
|
self.r.potentially_unused_imports.push(import);
|
|
let imported_binding = self.r.import(binding, import);
|
|
if ptr::eq(parent, self.r.graph_root) {
|
|
if let Some(entry) = self.r.extern_prelude.get(&ident.normalize_to_macros_2_0()) {
|
|
if expansion != LocalExpnId::ROOT
|
|
&& orig_name.is_some()
|
|
&& entry.extern_crate_item.is_none()
|
|
{
|
|
let msg = "macro-expanded `extern crate` items cannot \
|
|
shadow names passed with `--extern`";
|
|
self.r.session.span_err(item.span, msg);
|
|
}
|
|
}
|
|
let entry = self.r.extern_prelude.entry(ident.normalize_to_macros_2_0()).or_insert(
|
|
ExternPreludeEntry { extern_crate_item: None, introduced_by_item: true },
|
|
);
|
|
entry.extern_crate_item = Some(imported_binding);
|
|
if orig_name.is_some() {
|
|
entry.introduced_by_item = true;
|
|
}
|
|
}
|
|
self.r.define(parent, ident, TypeNS, imported_binding);
|
|
}
|
|
|
|
/// Constructs the reduced graph for one foreign item.
|
|
fn build_reduced_graph_for_foreign_item(&mut self, item: &ForeignItem) {
|
|
let local_def_id = self.r.local_def_id(item.id);
|
|
let def_id = local_def_id.to_def_id();
|
|
let (def_kind, ns) = match item.kind {
|
|
ForeignItemKind::Fn(..) => (DefKind::Fn, ValueNS),
|
|
ForeignItemKind::Static(_, mt, _) => (DefKind::Static(mt), ValueNS),
|
|
ForeignItemKind::TyAlias(..) => (DefKind::ForeignTy, TypeNS),
|
|
ForeignItemKind::MacCall(_) => unreachable!(),
|
|
};
|
|
let parent = self.parent_scope.module;
|
|
let expansion = self.parent_scope.expansion;
|
|
let vis = self.resolve_visibility(&item.vis);
|
|
let res = Res::Def(def_kind, def_id);
|
|
self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion));
|
|
self.r.visibilities.insert(local_def_id, vis);
|
|
}
|
|
|
|
fn build_reduced_graph_for_block(&mut self, block: &Block) {
|
|
let parent = self.parent_scope.module;
|
|
let expansion = self.parent_scope.expansion;
|
|
if self.block_needs_anonymous_module(block) {
|
|
let module = self.r.new_module(
|
|
Some(parent),
|
|
ModuleKind::Block,
|
|
expansion.to_expn_id(),
|
|
block.span,
|
|
parent.no_implicit_prelude,
|
|
);
|
|
self.r.block_map.insert(block.id, module);
|
|
self.parent_scope.module = module; // Descend into the block.
|
|
}
|
|
}
|
|
|
|
/// Builds the reduced graph for a single item in an external crate.
|
|
fn build_reduced_graph_for_external_crate_res(&mut self, child: ModChild) {
|
|
let parent = self.parent_scope.module;
|
|
let ModChild { ident, res, vis, span, macro_rules } = child;
|
|
let res = res.expect_non_local();
|
|
let expansion = self.parent_scope.expansion;
|
|
// Record primary definitions.
|
|
match res {
|
|
Res::Def(DefKind::Mod | DefKind::Enum | DefKind::Trait, def_id) => {
|
|
let module = self.r.expect_module(def_id);
|
|
self.r.define(parent, ident, TypeNS, (module, vis, span, expansion));
|
|
}
|
|
Res::Def(
|
|
DefKind::Struct
|
|
| DefKind::Union
|
|
| DefKind::Variant
|
|
| DefKind::TyAlias
|
|
| DefKind::ForeignTy
|
|
| DefKind::OpaqueTy
|
|
| DefKind::TraitAlias
|
|
| DefKind::AssocTy,
|
|
_,
|
|
)
|
|
| Res::PrimTy(..)
|
|
| Res::ToolMod => self.r.define(parent, ident, TypeNS, (res, vis, span, expansion)),
|
|
Res::Def(
|
|
DefKind::Fn
|
|
| DefKind::AssocFn
|
|
| DefKind::Static(_)
|
|
| DefKind::Const
|
|
| DefKind::AssocConst
|
|
| DefKind::Ctor(..),
|
|
_,
|
|
) => self.r.define(parent, ident, ValueNS, (res, vis, span, expansion)),
|
|
Res::Def(DefKind::Macro(..), _) | Res::NonMacroAttr(..) => {
|
|
if !macro_rules {
|
|
self.r.define(parent, ident, MacroNS, (res, vis, span, expansion))
|
|
}
|
|
}
|
|
Res::Def(
|
|
DefKind::TyParam
|
|
| DefKind::ConstParam
|
|
| DefKind::ExternCrate
|
|
| DefKind::Use
|
|
| DefKind::ForeignMod
|
|
| DefKind::AnonConst
|
|
| DefKind::InlineConst
|
|
| DefKind::Field
|
|
| DefKind::LifetimeParam
|
|
| DefKind::GlobalAsm
|
|
| DefKind::Closure
|
|
| DefKind::Impl
|
|
| DefKind::Generator,
|
|
_,
|
|
)
|
|
| Res::Local(..)
|
|
| Res::SelfTy { .. }
|
|
| Res::SelfCtor(..)
|
|
| Res::Err => bug!("unexpected resolution: {:?}", res),
|
|
}
|
|
// Record some extra data for better diagnostics.
|
|
let cstore = self.r.cstore();
|
|
match res {
|
|
Res::Def(DefKind::Struct, def_id) => {
|
|
let field_names =
|
|
cstore.struct_field_names_untracked(def_id, self.r.session).collect();
|
|
let ctor = cstore.ctor_def_id_and_kind_untracked(def_id);
|
|
if let Some((ctor_def_id, ctor_kind)) = ctor {
|
|
let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id);
|
|
let ctor_vis = cstore.visibility_untracked(ctor_def_id);
|
|
let field_visibilities =
|
|
cstore.struct_field_visibilities_untracked(def_id).collect();
|
|
self.r
|
|
.struct_constructors
|
|
.insert(def_id, (ctor_res, ctor_vis, field_visibilities));
|
|
}
|
|
self.insert_field_names(def_id, field_names);
|
|
}
|
|
Res::Def(DefKind::Union, def_id) => {
|
|
let field_names =
|
|
cstore.struct_field_names_untracked(def_id, self.r.session).collect();
|
|
self.insert_field_names(def_id, field_names);
|
|
}
|
|
Res::Def(DefKind::AssocFn, def_id) => {
|
|
if cstore.fn_has_self_parameter_untracked(def_id) {
|
|
self.r.has_self.insert(def_id);
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
|
|
fn add_macro_use_binding(
|
|
&mut self,
|
|
name: Symbol,
|
|
binding: &'a NameBinding<'a>,
|
|
span: Span,
|
|
allow_shadowing: bool,
|
|
) {
|
|
if self.r.macro_use_prelude.insert(name, binding).is_some() && !allow_shadowing {
|
|
let msg = format!("`{}` is already in scope", name);
|
|
let note =
|
|
"macro-expanded `#[macro_use]`s may not shadow existing macros (see RFC 1560)";
|
|
self.r.session.struct_span_err(span, &msg).note(note).emit();
|
|
}
|
|
}
|
|
|
|
/// Returns `true` if we should consider the underlying `extern crate` to be used.
|
|
fn process_macro_use_imports(&mut self, item: &Item, module: Module<'a>) -> bool {
|
|
let mut import_all = None;
|
|
let mut single_imports = Vec::new();
|
|
for attr in &item.attrs {
|
|
if attr.has_name(sym::macro_use) {
|
|
if self.parent_scope.module.parent.is_some() {
|
|
struct_span_err!(
|
|
self.r.session,
|
|
item.span,
|
|
E0468,
|
|
"an `extern crate` loading macros must be at the crate root"
|
|
)
|
|
.emit();
|
|
}
|
|
if let ItemKind::ExternCrate(Some(orig_name)) = item.kind {
|
|
if orig_name == kw::SelfLower {
|
|
self.r
|
|
.session
|
|
.struct_span_err(
|
|
attr.span,
|
|
"`#[macro_use]` is not supported on `extern crate self`",
|
|
)
|
|
.emit();
|
|
}
|
|
}
|
|
let ill_formed = |span| {
|
|
struct_span_err!(self.r.session, span, E0466, "bad macro import").emit();
|
|
};
|
|
match attr.meta() {
|
|
Some(meta) => match meta.kind {
|
|
MetaItemKind::Word => {
|
|
import_all = Some(meta.span);
|
|
break;
|
|
}
|
|
MetaItemKind::List(nested_metas) => {
|
|
for nested_meta in nested_metas {
|
|
match nested_meta.ident() {
|
|
Some(ident) if nested_meta.is_word() => {
|
|
single_imports.push(ident)
|
|
}
|
|
_ => ill_formed(nested_meta.span()),
|
|
}
|
|
}
|
|
}
|
|
MetaItemKind::NameValue(..) => ill_formed(meta.span),
|
|
},
|
|
None => ill_formed(attr.span),
|
|
}
|
|
}
|
|
}
|
|
|
|
let macro_use_import = |this: &Self, span| {
|
|
this.r.arenas.alloc_import(Import {
|
|
kind: ImportKind::MacroUse,
|
|
root_id: item.id,
|
|
id: item.id,
|
|
parent_scope: this.parent_scope,
|
|
imported_module: Cell::new(Some(ModuleOrUniformRoot::Module(module))),
|
|
use_span_with_attributes: item.span_with_attributes(),
|
|
has_attributes: !item.attrs.is_empty(),
|
|
use_span: item.span,
|
|
root_span: span,
|
|
span,
|
|
module_path: Vec::new(),
|
|
vis: Cell::new(ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())),
|
|
used: Cell::new(false),
|
|
})
|
|
};
|
|
|
|
let allow_shadowing = self.parent_scope.expansion == LocalExpnId::ROOT;
|
|
if let Some(span) = import_all {
|
|
let import = macro_use_import(self, span);
|
|
self.r.potentially_unused_imports.push(import);
|
|
module.for_each_child(self, |this, ident, ns, binding| {
|
|
if ns == MacroNS {
|
|
let imported_binding = this.r.import(binding, import);
|
|
this.add_macro_use_binding(ident.name, imported_binding, span, allow_shadowing);
|
|
}
|
|
});
|
|
} else {
|
|
for ident in single_imports.iter().cloned() {
|
|
let result = self.r.maybe_resolve_ident_in_module(
|
|
ModuleOrUniformRoot::Module(module),
|
|
ident,
|
|
MacroNS,
|
|
&self.parent_scope,
|
|
);
|
|
if let Ok(binding) = result {
|
|
let import = macro_use_import(self, ident.span);
|
|
self.r.potentially_unused_imports.push(import);
|
|
let imported_binding = self.r.import(binding, import);
|
|
self.add_macro_use_binding(
|
|
ident.name,
|
|
imported_binding,
|
|
ident.span,
|
|
allow_shadowing,
|
|
);
|
|
} else {
|
|
struct_span_err!(self.r.session, ident.span, E0469, "imported macro not found")
|
|
.emit();
|
|
}
|
|
}
|
|
}
|
|
import_all.is_some() || !single_imports.is_empty()
|
|
}
|
|
|
|
/// Returns `true` if this attribute list contains `macro_use`.
|
|
fn contains_macro_use(&mut self, attrs: &[ast::Attribute]) -> bool {
|
|
for attr in attrs {
|
|
if attr.has_name(sym::macro_escape) {
|
|
let msg = "`#[macro_escape]` is a deprecated synonym for `#[macro_use]`";
|
|
let mut err = self.r.session.struct_span_warn(attr.span, msg);
|
|
if let ast::AttrStyle::Inner = attr.style {
|
|
err.help("try an outer attribute: `#[macro_use]`").emit();
|
|
} else {
|
|
err.emit();
|
|
}
|
|
} else if !attr.has_name(sym::macro_use) {
|
|
continue;
|
|
}
|
|
|
|
if !attr.is_word() {
|
|
self.r.session.span_err(attr.span, "arguments to `macro_use` are not allowed here");
|
|
}
|
|
return true;
|
|
}
|
|
|
|
false
|
|
}
|
|
|
|
fn visit_invoc(&mut self, id: NodeId) -> LocalExpnId {
|
|
let invoc_id = id.placeholder_to_expn_id();
|
|
let old_parent_scope = self.r.invocation_parent_scopes.insert(invoc_id, self.parent_scope);
|
|
assert!(old_parent_scope.is_none(), "invocation data is reset for an invocation");
|
|
invoc_id
|
|
}
|
|
|
|
/// Visit invocation in context in which it can emit a named item (possibly `macro_rules`)
|
|
/// directly into its parent scope's module.
|
|
fn visit_invoc_in_module(&mut self, id: NodeId) -> MacroRulesScopeRef<'a> {
|
|
let invoc_id = self.visit_invoc(id);
|
|
self.parent_scope.module.unexpanded_invocations.borrow_mut().insert(invoc_id);
|
|
self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Invocation(invoc_id))
|
|
}
|
|
|
|
fn proc_macro_stub(&self, item: &ast::Item) -> Option<(MacroKind, Ident, Span)> {
|
|
if self.r.session.contains_name(&item.attrs, sym::proc_macro) {
|
|
return Some((MacroKind::Bang, item.ident, item.span));
|
|
} else if self.r.session.contains_name(&item.attrs, sym::proc_macro_attribute) {
|
|
return Some((MacroKind::Attr, item.ident, item.span));
|
|
} else if let Some(attr) = self.r.session.find_by_name(&item.attrs, sym::proc_macro_derive)
|
|
{
|
|
if let Some(nested_meta) = attr.meta_item_list().and_then(|list| list.get(0).cloned()) {
|
|
if let Some(ident) = nested_meta.ident() {
|
|
return Some((MacroKind::Derive, ident, ident.span));
|
|
}
|
|
}
|
|
}
|
|
None
|
|
}
|
|
|
|
// Mark the given macro as unused unless its name starts with `_`.
|
|
// Macro uses will remove items from this set, and the remaining
|
|
// items will be reported as `unused_macros`.
|
|
fn insert_unused_macro(
|
|
&mut self,
|
|
ident: Ident,
|
|
def_id: LocalDefId,
|
|
node_id: NodeId,
|
|
rule_spans: &[(usize, Span)],
|
|
) {
|
|
if !ident.as_str().starts_with('_') {
|
|
self.r.unused_macros.insert(def_id, (node_id, ident));
|
|
for (rule_i, rule_span) in rule_spans.iter() {
|
|
self.r.unused_macro_rules.insert((def_id, *rule_i), (ident, *rule_span));
|
|
}
|
|
}
|
|
}
|
|
|
|
fn define_macro(&mut self, item: &ast::Item) -> MacroRulesScopeRef<'a> {
|
|
let parent_scope = self.parent_scope;
|
|
let expansion = parent_scope.expansion;
|
|
let def_id = self.r.local_def_id(item.id);
|
|
let (ext, ident, span, macro_rules, rule_spans) = match &item.kind {
|
|
ItemKind::MacroDef(def) => {
|
|
let (ext, rule_spans) = self.r.compile_macro(item, self.r.session.edition());
|
|
let ext = Lrc::new(ext);
|
|
(ext, item.ident, item.span, def.macro_rules, rule_spans)
|
|
}
|
|
ItemKind::Fn(..) => match self.proc_macro_stub(item) {
|
|
Some((macro_kind, ident, span)) => {
|
|
self.r.proc_macro_stubs.insert(def_id);
|
|
(self.r.dummy_ext(macro_kind), ident, span, false, Vec::new())
|
|
}
|
|
None => return parent_scope.macro_rules,
|
|
},
|
|
_ => unreachable!(),
|
|
};
|
|
|
|
let res = Res::Def(DefKind::Macro(ext.macro_kind()), def_id.to_def_id());
|
|
self.r.macro_map.insert(def_id.to_def_id(), MacroData { ext, macro_rules });
|
|
self.r.local_macro_def_scopes.insert(def_id, parent_scope.module);
|
|
|
|
if macro_rules {
|
|
let ident = ident.normalize_to_macros_2_0();
|
|
self.r.macro_names.insert(ident);
|
|
let is_macro_export = self.r.session.contains_name(&item.attrs, sym::macro_export);
|
|
let vis = if is_macro_export {
|
|
ty::Visibility::Public
|
|
} else {
|
|
ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())
|
|
};
|
|
let binding = (res, vis, span, expansion).to_name_binding(self.r.arenas);
|
|
self.r.set_binding_parent_module(binding, parent_scope.module);
|
|
if is_macro_export {
|
|
let module = self.r.graph_root;
|
|
self.r.define(module, ident, MacroNS, (res, vis, span, expansion, IsMacroExport));
|
|
} else {
|
|
self.r.check_reserved_macro_name(ident, res);
|
|
self.insert_unused_macro(ident, def_id, item.id, &rule_spans);
|
|
}
|
|
self.r.visibilities.insert(def_id, vis);
|
|
let scope = self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Binding(
|
|
self.r.arenas.alloc_macro_rules_binding(MacroRulesBinding {
|
|
parent_macro_rules_scope: parent_scope.macro_rules,
|
|
binding,
|
|
ident,
|
|
}),
|
|
));
|
|
self.r.macro_rules_scopes.insert(def_id, scope);
|
|
scope
|
|
} else {
|
|
let module = parent_scope.module;
|
|
let vis = match item.kind {
|
|
// Visibilities must not be resolved non-speculatively twice
|
|
// and we already resolved this one as a `fn` item visibility.
|
|
ItemKind::Fn(..) => {
|
|
self.try_resolve_visibility(&item.vis, false).unwrap_or(ty::Visibility::Public)
|
|
}
|
|
_ => self.resolve_visibility(&item.vis),
|
|
};
|
|
if vis != ty::Visibility::Public {
|
|
self.insert_unused_macro(ident, def_id, item.id, &rule_spans);
|
|
}
|
|
self.r.define(module, ident, MacroNS, (res, vis, span, expansion));
|
|
self.r.visibilities.insert(def_id, vis);
|
|
self.parent_scope.macro_rules
|
|
}
|
|
}
|
|
}
|
|
|
|
macro_rules! method {
|
|
($visit:ident: $ty:ty, $invoc:path, $walk:ident) => {
|
|
fn $visit(&mut self, node: &'b $ty) {
|
|
if let $invoc(..) = node.kind {
|
|
self.visit_invoc(node.id);
|
|
} else {
|
|
visit::$walk(self, node);
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
impl<'a, 'b> Visitor<'b> for BuildReducedGraphVisitor<'a, 'b> {
|
|
method!(visit_expr: ast::Expr, ast::ExprKind::MacCall, walk_expr);
|
|
method!(visit_pat: ast::Pat, ast::PatKind::MacCall, walk_pat);
|
|
method!(visit_ty: ast::Ty, ast::TyKind::MacCall, walk_ty);
|
|
|
|
fn visit_item(&mut self, item: &'b Item) {
|
|
let orig_module_scope = self.parent_scope.module;
|
|
self.parent_scope.macro_rules = match item.kind {
|
|
ItemKind::MacroDef(..) => {
|
|
let macro_rules_scope = self.define_macro(item);
|
|
visit::walk_item(self, item);
|
|
macro_rules_scope
|
|
}
|
|
ItemKind::MacCall(..) => {
|
|
let macro_rules_scope = self.visit_invoc_in_module(item.id);
|
|
visit::walk_item(self, item);
|
|
macro_rules_scope
|
|
}
|
|
_ => {
|
|
let orig_macro_rules_scope = self.parent_scope.macro_rules;
|
|
self.build_reduced_graph_for_item(item);
|
|
visit::walk_item(self, item);
|
|
match item.kind {
|
|
ItemKind::Mod(..) if self.contains_macro_use(&item.attrs) => {
|
|
self.parent_scope.macro_rules
|
|
}
|
|
_ => orig_macro_rules_scope,
|
|
}
|
|
}
|
|
};
|
|
self.parent_scope.module = orig_module_scope;
|
|
}
|
|
|
|
fn visit_stmt(&mut self, stmt: &'b ast::Stmt) {
|
|
if let ast::StmtKind::MacCall(..) = stmt.kind {
|
|
self.parent_scope.macro_rules = self.visit_invoc_in_module(stmt.id);
|
|
} else {
|
|
visit::walk_stmt(self, stmt);
|
|
}
|
|
}
|
|
|
|
fn visit_foreign_item(&mut self, foreign_item: &'b ForeignItem) {
|
|
if let ForeignItemKind::MacCall(_) = foreign_item.kind {
|
|
self.visit_invoc_in_module(foreign_item.id);
|
|
return;
|
|
}
|
|
|
|
self.build_reduced_graph_for_foreign_item(foreign_item);
|
|
visit::walk_foreign_item(self, foreign_item);
|
|
}
|
|
|
|
fn visit_block(&mut self, block: &'b Block) {
|
|
let orig_current_module = self.parent_scope.module;
|
|
let orig_current_macro_rules_scope = self.parent_scope.macro_rules;
|
|
self.build_reduced_graph_for_block(block);
|
|
visit::walk_block(self, block);
|
|
self.parent_scope.module = orig_current_module;
|
|
self.parent_scope.macro_rules = orig_current_macro_rules_scope;
|
|
}
|
|
|
|
fn visit_assoc_item(&mut self, item: &'b AssocItem, ctxt: AssocCtxt) {
|
|
if let AssocItemKind::MacCall(_) = item.kind {
|
|
match ctxt {
|
|
AssocCtxt::Trait => {
|
|
self.visit_invoc_in_module(item.id);
|
|
}
|
|
AssocCtxt::Impl => {
|
|
self.visit_invoc(item.id);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
let vis = self.resolve_visibility(&item.vis);
|
|
let local_def_id = self.r.local_def_id(item.id);
|
|
let def_id = local_def_id.to_def_id();
|
|
|
|
if !(ctxt == AssocCtxt::Impl
|
|
&& matches!(item.vis.kind, ast::VisibilityKind::Inherited)
|
|
&& self
|
|
.r
|
|
.trait_impl_items
|
|
.contains(&ty::DefIdTree::local_parent(&*self.r, local_def_id)))
|
|
{
|
|
// Trait impl item visibility is inherited from its trait when not specified
|
|
// explicitly. In that case we cannot determine it here in early resolve,
|
|
// so we leave a hole in the visibility table to be filled later.
|
|
self.r.visibilities.insert(local_def_id, vis);
|
|
}
|
|
|
|
if ctxt == AssocCtxt::Trait {
|
|
let (def_kind, ns) = match item.kind {
|
|
AssocItemKind::Const(..) => (DefKind::AssocConst, ValueNS),
|
|
AssocItemKind::Fn(box Fn { ref sig, .. }) => {
|
|
if sig.decl.has_self() {
|
|
self.r.has_self.insert(def_id);
|
|
}
|
|
(DefKind::AssocFn, ValueNS)
|
|
}
|
|
AssocItemKind::TyAlias(..) => (DefKind::AssocTy, TypeNS),
|
|
AssocItemKind::MacCall(_) => bug!(), // handled above
|
|
};
|
|
|
|
let parent = self.parent_scope.module;
|
|
let expansion = self.parent_scope.expansion;
|
|
let res = Res::Def(def_kind, def_id);
|
|
self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion));
|
|
}
|
|
|
|
visit::walk_assoc_item(self, item, ctxt);
|
|
}
|
|
|
|
fn visit_attribute(&mut self, attr: &'b ast::Attribute) {
|
|
if !attr.is_doc_comment() && attr::is_builtin_attr(attr) {
|
|
self.r
|
|
.builtin_attrs
|
|
.push((attr.get_normal_item().path.segments[0].ident, self.parent_scope));
|
|
}
|
|
visit::walk_attribute(self, attr);
|
|
}
|
|
|
|
fn visit_arm(&mut self, arm: &'b ast::Arm) {
|
|
if arm.is_placeholder {
|
|
self.visit_invoc(arm.id);
|
|
} else {
|
|
visit::walk_arm(self, arm);
|
|
}
|
|
}
|
|
|
|
fn visit_expr_field(&mut self, f: &'b ast::ExprField) {
|
|
if f.is_placeholder {
|
|
self.visit_invoc(f.id);
|
|
} else {
|
|
visit::walk_expr_field(self, f);
|
|
}
|
|
}
|
|
|
|
fn visit_pat_field(&mut self, fp: &'b ast::PatField) {
|
|
if fp.is_placeholder {
|
|
self.visit_invoc(fp.id);
|
|
} else {
|
|
visit::walk_pat_field(self, fp);
|
|
}
|
|
}
|
|
|
|
fn visit_generic_param(&mut self, param: &'b ast::GenericParam) {
|
|
if param.is_placeholder {
|
|
self.visit_invoc(param.id);
|
|
} else {
|
|
visit::walk_generic_param(self, param);
|
|
}
|
|
}
|
|
|
|
fn visit_param(&mut self, p: &'b ast::Param) {
|
|
if p.is_placeholder {
|
|
self.visit_invoc(p.id);
|
|
} else {
|
|
visit::walk_param(self, p);
|
|
}
|
|
}
|
|
|
|
fn visit_field_def(&mut self, sf: &'b ast::FieldDef) {
|
|
if sf.is_placeholder {
|
|
self.visit_invoc(sf.id);
|
|
} else {
|
|
let vis = self.resolve_visibility(&sf.vis);
|
|
self.r.visibilities.insert(self.r.local_def_id(sf.id), vis);
|
|
visit::walk_field_def(self, sf);
|
|
}
|
|
}
|
|
|
|
// Constructs the reduced graph for one variant. Variants exist in the
|
|
// type and value namespaces.
|
|
fn visit_variant(&mut self, variant: &'b ast::Variant) {
|
|
if variant.is_placeholder {
|
|
self.visit_invoc_in_module(variant.id);
|
|
return;
|
|
}
|
|
|
|
let parent = self.parent_scope.module;
|
|
let expn_id = self.parent_scope.expansion;
|
|
let ident = variant.ident;
|
|
|
|
// Define a name in the type namespace.
|
|
let def_id = self.r.local_def_id(variant.id);
|
|
let res = Res::Def(DefKind::Variant, def_id.to_def_id());
|
|
let vis = self.resolve_visibility(&variant.vis);
|
|
self.r.define(parent, ident, TypeNS, (res, vis, variant.span, expn_id));
|
|
self.r.visibilities.insert(def_id, vis);
|
|
|
|
// If the variant is marked as non_exhaustive then lower the visibility to within the crate.
|
|
let ctor_vis = if vis == ty::Visibility::Public
|
|
&& self.r.session.contains_name(&variant.attrs, sym::non_exhaustive)
|
|
{
|
|
ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())
|
|
} else {
|
|
vis
|
|
};
|
|
|
|
// Define a constructor name in the value namespace.
|
|
// Braced variants, unlike structs, generate unusable names in
|
|
// value namespace, they are reserved for possible future use.
|
|
// It's ok to use the variant's id as a ctor id since an
|
|
// error will be reported on any use of such resolution anyway.
|
|
let ctor_node_id = variant.data.ctor_id().unwrap_or(variant.id);
|
|
let ctor_def_id = self.r.local_def_id(ctor_node_id);
|
|
let ctor_kind = CtorKind::from_ast(&variant.data);
|
|
let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Variant, ctor_kind), ctor_def_id.to_def_id());
|
|
self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, variant.span, expn_id));
|
|
if ctor_def_id != def_id {
|
|
self.r.visibilities.insert(ctor_def_id, ctor_vis);
|
|
}
|
|
// Record field names for error reporting.
|
|
self.insert_field_names_local(ctor_def_id.to_def_id(), &variant.data);
|
|
|
|
visit::walk_variant(self, variant);
|
|
}
|
|
|
|
fn visit_crate(&mut self, krate: &'b ast::Crate) {
|
|
if krate.is_placeholder {
|
|
self.visit_invoc_in_module(krate.id);
|
|
} else {
|
|
visit::walk_crate(self, krate);
|
|
self.contains_macro_use(&krate.attrs);
|
|
}
|
|
}
|
|
}
|