2323 lines
85 KiB
Rust
2323 lines
85 KiB
Rust
//! This crate is responsible for the part of name resolution that doesn't require type checker.
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//!
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//! Module structure of the crate is built here.
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//! Paths in macros, imports, expressions, types, patterns are resolved here.
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//! Label and lifetime names are resolved here as well.
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//!
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//! Type-relative name resolution (methods, fields, associated items) happens in `rustc_hir_analysis`.
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// tidy-alphabetical-start
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#![allow(internal_features)]
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#![allow(rustc::diagnostic_outside_of_impl)]
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#![allow(rustc::potential_query_instability)]
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#![allow(rustc::untranslatable_diagnostic)]
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#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
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#![doc(rust_logo)]
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#![feature(assert_matches)]
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#![feature(box_patterns)]
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#![feature(extract_if)]
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#![feature(if_let_guard)]
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#![feature(iter_intersperse)]
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#![feature(let_chains)]
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#![feature(rustc_attrs)]
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#![feature(rustdoc_internals)]
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#![warn(unreachable_pub)]
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// tidy-alphabetical-end
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use std::cell::{Cell, RefCell};
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use std::collections::BTreeSet;
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use std::fmt;
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use diagnostics::{ImportSuggestion, LabelSuggestion, Suggestion};
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use effective_visibilities::EffectiveVisibilitiesVisitor;
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use errors::{
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ParamKindInEnumDiscriminant, ParamKindInNonTrivialAnonConst, ParamKindInTyOfConstParam,
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};
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use imports::{Import, ImportData, ImportKind, NameResolution};
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use late::{HasGenericParams, PathSource, PatternSource, UnnecessaryQualification};
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use macros::{MacroRulesBinding, MacroRulesScope, MacroRulesScopeRef};
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use rustc_arena::{DroplessArena, TypedArena};
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use rustc_ast::expand::StrippedCfgItem;
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use rustc_ast::node_id::NodeMap;
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use rustc_ast::{
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self as ast, AngleBracketedArg, CRATE_NODE_ID, Crate, Expr, ExprKind, GenericArg, GenericArgs,
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LitKind, NodeId, Path, attr,
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};
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use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
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use rustc_data_structures::intern::Interned;
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use rustc_data_structures::steal::Steal;
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use rustc_data_structures::sync::{FreezeReadGuard, Lrc};
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use rustc_errors::{Applicability, Diag, ErrCode, ErrorGuaranteed};
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use rustc_expand::base::{DeriveResolution, SyntaxExtension, SyntaxExtensionKind};
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use rustc_feature::BUILTIN_ATTRIBUTES;
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use rustc_hir::def::Namespace::{self, *};
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use rustc_hir::def::{
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self, CtorOf, DefKind, DocLinkResMap, LifetimeRes, NonMacroAttrKind, PartialRes, PerNS,
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};
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use rustc_hir::def_id::{CRATE_DEF_ID, CrateNum, DefId, LOCAL_CRATE, LocalDefId, LocalDefIdMap};
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use rustc_hir::{PrimTy, TraitCandidate};
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use rustc_index::IndexVec;
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use rustc_metadata::creader::{CStore, CrateLoader};
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use rustc_middle::metadata::ModChild;
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use rustc_middle::middle::privacy::EffectiveVisibilities;
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use rustc_middle::query::Providers;
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use rustc_middle::span_bug;
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use rustc_middle::ty::{
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self, DelegationFnSig, Feed, MainDefinition, RegisteredTools, ResolverGlobalCtxt,
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ResolverOutputs, TyCtxt, TyCtxtFeed,
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};
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use rustc_query_system::ich::StableHashingContext;
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use rustc_session::lint::builtin::PRIVATE_MACRO_USE;
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use rustc_session::lint::{BuiltinLintDiag, LintBuffer};
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use rustc_span::hygiene::{ExpnId, LocalExpnId, MacroKind, SyntaxContext, Transparency};
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use rustc_span::symbol::{Ident, Symbol, kw, sym};
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use rustc_span::{DUMMY_SP, Span};
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use smallvec::{SmallVec, smallvec};
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use tracing::debug;
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type Res = def::Res<NodeId>;
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mod build_reduced_graph;
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mod check_unused;
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mod def_collector;
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mod diagnostics;
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mod effective_visibilities;
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mod errors;
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mod ident;
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mod imports;
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mod late;
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mod macros;
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pub mod rustdoc;
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rustc_fluent_macro::fluent_messages! { "../messages.ftl" }
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#[derive(Debug)]
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enum Weak {
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Yes,
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No,
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}
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#[derive(Copy, Clone, PartialEq, Debug)]
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enum Determinacy {
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Determined,
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Undetermined,
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}
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impl Determinacy {
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fn determined(determined: bool) -> Determinacy {
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if determined { Determinacy::Determined } else { Determinacy::Undetermined }
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}
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}
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/// A specific scope in which a name can be looked up.
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/// This enum is currently used only for early resolution (imports and macros),
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/// but not for late resolution yet.
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#[derive(Clone, Copy, Debug)]
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enum Scope<'ra> {
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DeriveHelpers(LocalExpnId),
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DeriveHelpersCompat,
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MacroRules(MacroRulesScopeRef<'ra>),
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CrateRoot,
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// The node ID is for reporting the `PROC_MACRO_DERIVE_RESOLUTION_FALLBACK`
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// lint if it should be reported.
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Module(Module<'ra>, Option<NodeId>),
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MacroUsePrelude,
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BuiltinAttrs,
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ExternPrelude,
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ToolPrelude,
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StdLibPrelude,
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BuiltinTypes,
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}
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/// Names from different contexts may want to visit different subsets of all specific scopes
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/// with different restrictions when looking up the resolution.
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/// This enum is currently used only for early resolution (imports and macros),
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/// but not for late resolution yet.
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#[derive(Clone, Copy, Debug)]
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enum ScopeSet<'ra> {
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/// All scopes with the given namespace.
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All(Namespace),
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/// Crate root, then extern prelude (used for mixed 2015-2018 mode in macros).
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AbsolutePath(Namespace),
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/// All scopes with macro namespace and the given macro kind restriction.
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Macro(MacroKind),
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/// All scopes with the given namespace, used for partially performing late resolution.
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/// The node id enables lints and is used for reporting them.
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Late(Namespace, Module<'ra>, Option<NodeId>),
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}
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/// Everything you need to know about a name's location to resolve it.
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/// Serves as a starting point for the scope visitor.
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/// This struct is currently used only for early resolution (imports and macros),
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/// but not for late resolution yet.
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#[derive(Clone, Copy, Debug)]
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struct ParentScope<'ra> {
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module: Module<'ra>,
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expansion: LocalExpnId,
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macro_rules: MacroRulesScopeRef<'ra>,
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derives: &'ra [ast::Path],
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}
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impl<'ra> ParentScope<'ra> {
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/// Creates a parent scope with the passed argument used as the module scope component,
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/// and other scope components set to default empty values.
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fn module(module: Module<'ra>, resolver: &Resolver<'ra, '_>) -> ParentScope<'ra> {
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ParentScope {
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module,
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expansion: LocalExpnId::ROOT,
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macro_rules: resolver.arenas.alloc_macro_rules_scope(MacroRulesScope::Empty),
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derives: &[],
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}
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}
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}
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#[derive(Copy, Debug, Clone)]
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struct InvocationParent {
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parent_def: LocalDefId,
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pending_anon_const_info: Option<PendingAnonConstInfo>,
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impl_trait_context: ImplTraitContext,
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in_attr: bool,
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}
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impl InvocationParent {
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const ROOT: Self = Self {
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parent_def: CRATE_DEF_ID,
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pending_anon_const_info: None,
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impl_trait_context: ImplTraitContext::Existential,
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in_attr: false,
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};
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}
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#[derive(Copy, Debug, Clone)]
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struct PendingAnonConstInfo {
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// A const arg is only a "trivial" const arg if it has at *most* one set of braces
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// around the argument. We track whether we have stripped an outter brace so that
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// if a macro expands to a braced expression *and* the macro was itself inside of
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// some braces then we can consider it to be a non-trivial const argument.
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block_was_stripped: bool,
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id: NodeId,
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span: Span,
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}
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#[derive(Copy, Debug, Clone)]
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enum ImplTraitContext {
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Existential,
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Universal,
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}
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/// Used for tracking import use types which will be used for redundant import checking.
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/// ### Used::Scope Example
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/// ```rust,compile_fail
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/// #![deny(redundant_imports)]
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/// use std::mem::drop;
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/// fn main() {
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/// let s = Box::new(32);
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/// drop(s);
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/// }
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/// ```
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/// Used::Other is for other situations like module-relative uses.
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#[derive(Clone, Copy, PartialEq, PartialOrd, Debug)]
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enum Used {
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Scope,
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Other,
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}
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#[derive(Debug)]
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struct BindingError {
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name: Symbol,
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origin: BTreeSet<Span>,
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target: BTreeSet<Span>,
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could_be_path: bool,
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}
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#[derive(Debug)]
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enum ResolutionError<'ra> {
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/// Error E0401: can't use type or const parameters from outer item.
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GenericParamsFromOuterItem(Res, HasGenericParams, DefKind),
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/// Error E0403: the name is already used for a type or const parameter in this generic
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/// parameter list.
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NameAlreadyUsedInParameterList(Symbol, Span),
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/// Error E0407: method is not a member of trait.
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MethodNotMemberOfTrait(Ident, String, Option<Symbol>),
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/// Error E0437: type is not a member of trait.
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TypeNotMemberOfTrait(Ident, String, Option<Symbol>),
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/// Error E0438: const is not a member of trait.
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ConstNotMemberOfTrait(Ident, String, Option<Symbol>),
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/// Error E0408: variable `{}` is not bound in all patterns.
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VariableNotBoundInPattern(BindingError, ParentScope<'ra>),
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/// Error E0409: variable `{}` is bound in inconsistent ways within the same match arm.
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VariableBoundWithDifferentMode(Symbol, Span),
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/// Error E0415: identifier is bound more than once in this parameter list.
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IdentifierBoundMoreThanOnceInParameterList(Symbol),
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/// Error E0416: identifier is bound more than once in the same pattern.
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IdentifierBoundMoreThanOnceInSamePattern(Symbol),
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/// Error E0426: use of undeclared label.
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UndeclaredLabel { name: Symbol, suggestion: Option<LabelSuggestion> },
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/// Error E0429: `self` imports are only allowed within a `{ }` list.
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SelfImportsOnlyAllowedWithin { root: bool, span_with_rename: Span },
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/// Error E0430: `self` import can only appear once in the list.
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SelfImportCanOnlyAppearOnceInTheList,
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/// Error E0431: `self` import can only appear in an import list with a non-empty prefix.
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SelfImportOnlyInImportListWithNonEmptyPrefix,
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/// Error E0433: failed to resolve.
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FailedToResolve {
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segment: Option<Symbol>,
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label: String,
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suggestion: Option<Suggestion>,
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module: Option<ModuleOrUniformRoot<'ra>>,
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},
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/// Error E0434: can't capture dynamic environment in a fn item.
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CannotCaptureDynamicEnvironmentInFnItem,
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/// Error E0435: attempt to use a non-constant value in a constant.
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AttemptToUseNonConstantValueInConstant {
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ident: Ident,
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suggestion: &'static str,
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current: &'static str,
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type_span: Option<Span>,
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},
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/// Error E0530: `X` bindings cannot shadow `Y`s.
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BindingShadowsSomethingUnacceptable {
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shadowing_binding: PatternSource,
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name: Symbol,
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participle: &'static str,
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article: &'static str,
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shadowed_binding: Res,
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shadowed_binding_span: Span,
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},
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/// Error E0128: generic parameters with a default cannot use forward-declared identifiers.
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ForwardDeclaredGenericParam,
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/// ERROR E0770: the type of const parameters must not depend on other generic parameters.
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ParamInTyOfConstParam { name: Symbol, param_kind: Option<ParamKindInTyOfConstParam> },
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/// generic parameters must not be used inside const evaluations.
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///
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/// This error is only emitted when using `min_const_generics`.
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ParamInNonTrivialAnonConst { name: Symbol, param_kind: ParamKindInNonTrivialAnonConst },
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/// generic parameters must not be used inside enum discriminants.
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///
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/// This error is emitted even with `generic_const_exprs`.
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ParamInEnumDiscriminant { name: Symbol, param_kind: ParamKindInEnumDiscriminant },
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/// Error E0735: generic parameters with a default cannot use `Self`
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||
SelfInGenericParamDefault,
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||
/// Error E0767: use of unreachable label
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||
UnreachableLabel { name: Symbol, definition_span: Span, suggestion: Option<LabelSuggestion> },
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/// Error E0323, E0324, E0325: mismatch between trait item and impl item.
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TraitImplMismatch {
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name: Symbol,
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kind: &'static str,
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trait_path: String,
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trait_item_span: Span,
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code: ErrCode,
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},
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/// Error E0201: multiple impl items for the same trait item.
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TraitImplDuplicate { name: Symbol, trait_item_span: Span, old_span: Span },
|
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/// Inline asm `sym` operand must refer to a `fn` or `static`.
|
||
InvalidAsmSym,
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/// `self` used instead of `Self` in a generic parameter
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||
LowercaseSelf,
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/// A never pattern has a binding.
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||
BindingInNeverPattern,
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||
}
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||
enum VisResolutionError<'a> {
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Relative2018(Span, &'a ast::Path),
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AncestorOnly(Span),
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FailedToResolve(Span, String, Option<Suggestion>),
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ExpectedFound(Span, String, Res),
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Indeterminate(Span),
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ModuleOnly(Span),
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}
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||
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||
/// A minimal representation of a path segment. We use this in resolve because we synthesize 'path
|
||
/// segments' which don't have the rest of an AST or HIR `PathSegment`.
|
||
#[derive(Clone, Copy, Debug)]
|
||
struct Segment {
|
||
ident: Ident,
|
||
id: Option<NodeId>,
|
||
/// Signals whether this `PathSegment` has generic arguments. Used to avoid providing
|
||
/// nonsensical suggestions.
|
||
has_generic_args: bool,
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||
/// Signals whether this `PathSegment` has lifetime arguments.
|
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has_lifetime_args: bool,
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args_span: Span,
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}
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impl Segment {
|
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fn from_path(path: &Path) -> Vec<Segment> {
|
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path.segments.iter().map(|s| s.into()).collect()
|
||
}
|
||
|
||
fn from_ident(ident: Ident) -> Segment {
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||
Segment {
|
||
ident,
|
||
id: None,
|
||
has_generic_args: false,
|
||
has_lifetime_args: false,
|
||
args_span: DUMMY_SP,
|
||
}
|
||
}
|
||
|
||
fn from_ident_and_id(ident: Ident, id: NodeId) -> Segment {
|
||
Segment {
|
||
ident,
|
||
id: Some(id),
|
||
has_generic_args: false,
|
||
has_lifetime_args: false,
|
||
args_span: DUMMY_SP,
|
||
}
|
||
}
|
||
|
||
fn names_to_string(segments: &[Segment]) -> String {
|
||
names_to_string(&segments.iter().map(|seg| seg.ident.name).collect::<Vec<_>>())
|
||
}
|
||
}
|
||
|
||
impl<'a> From<&'a ast::PathSegment> for Segment {
|
||
fn from(seg: &'a ast::PathSegment) -> Segment {
|
||
let has_generic_args = seg.args.is_some();
|
||
let (args_span, has_lifetime_args) = if let Some(args) = seg.args.as_deref() {
|
||
match args {
|
||
GenericArgs::AngleBracketed(args) => {
|
||
let found_lifetimes = args
|
||
.args
|
||
.iter()
|
||
.any(|arg| matches!(arg, AngleBracketedArg::Arg(GenericArg::Lifetime(_))));
|
||
(args.span, found_lifetimes)
|
||
}
|
||
GenericArgs::Parenthesized(args) => (args.span, true),
|
||
GenericArgs::ParenthesizedElided(span) => (*span, true),
|
||
}
|
||
} else {
|
||
(DUMMY_SP, false)
|
||
};
|
||
Segment {
|
||
ident: seg.ident,
|
||
id: Some(seg.id),
|
||
has_generic_args,
|
||
has_lifetime_args,
|
||
args_span,
|
||
}
|
||
}
|
||
}
|
||
|
||
/// An intermediate resolution result.
|
||
///
|
||
/// This refers to the thing referred by a name. The difference between `Res` and `Item` is that
|
||
/// items are visible in their whole block, while `Res`es only from the place they are defined
|
||
/// forward.
|
||
#[derive(Debug, Copy, Clone)]
|
||
enum LexicalScopeBinding<'ra> {
|
||
Item(NameBinding<'ra>),
|
||
Res(Res),
|
||
}
|
||
|
||
impl<'ra> LexicalScopeBinding<'ra> {
|
||
fn res(self) -> Res {
|
||
match self {
|
||
LexicalScopeBinding::Item(binding) => binding.res(),
|
||
LexicalScopeBinding::Res(res) => res,
|
||
}
|
||
}
|
||
}
|
||
|
||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||
enum ModuleOrUniformRoot<'ra> {
|
||
/// Regular module.
|
||
Module(Module<'ra>),
|
||
|
||
/// Virtual module that denotes resolution in crate root with fallback to extern prelude.
|
||
CrateRootAndExternPrelude,
|
||
|
||
/// Virtual module that denotes resolution in extern prelude.
|
||
/// Used for paths starting with `::` on 2018 edition.
|
||
ExternPrelude,
|
||
|
||
/// Virtual module that denotes resolution in current scope.
|
||
/// Used only for resolving single-segment imports. The reason it exists is that import paths
|
||
/// are always split into two parts, the first of which should be some kind of module.
|
||
CurrentScope,
|
||
}
|
||
|
||
#[derive(Debug)]
|
||
enum PathResult<'ra> {
|
||
Module(ModuleOrUniformRoot<'ra>),
|
||
NonModule(PartialRes),
|
||
Indeterminate,
|
||
Failed {
|
||
span: Span,
|
||
label: String,
|
||
suggestion: Option<Suggestion>,
|
||
is_error_from_last_segment: bool,
|
||
/// The final module being resolved, for instance:
|
||
///
|
||
/// ```compile_fail
|
||
/// mod a {
|
||
/// mod b {
|
||
/// mod c {}
|
||
/// }
|
||
/// }
|
||
///
|
||
/// use a::not_exist::c;
|
||
/// ```
|
||
///
|
||
/// In this case, `module` will point to `a`.
|
||
module: Option<ModuleOrUniformRoot<'ra>>,
|
||
/// The segment name of target
|
||
segment_name: Symbol,
|
||
},
|
||
}
|
||
|
||
impl<'ra> PathResult<'ra> {
|
||
fn failed(
|
||
ident: Ident,
|
||
is_error_from_last_segment: bool,
|
||
finalize: bool,
|
||
module: Option<ModuleOrUniformRoot<'ra>>,
|
||
label_and_suggestion: impl FnOnce() -> (String, Option<Suggestion>),
|
||
) -> PathResult<'ra> {
|
||
let (label, suggestion) =
|
||
if finalize { label_and_suggestion() } else { (String::new(), None) };
|
||
PathResult::Failed {
|
||
span: ident.span,
|
||
segment_name: ident.name,
|
||
label,
|
||
suggestion,
|
||
is_error_from_last_segment,
|
||
module,
|
||
}
|
||
}
|
||
}
|
||
|
||
#[derive(Debug)]
|
||
enum ModuleKind {
|
||
/// An anonymous module; e.g., just a block.
|
||
///
|
||
/// ```
|
||
/// fn main() {
|
||
/// fn f() {} // (1)
|
||
/// { // This is an anonymous module
|
||
/// f(); // This resolves to (2) as we are inside the block.
|
||
/// fn f() {} // (2)
|
||
/// }
|
||
/// f(); // Resolves to (1)
|
||
/// }
|
||
/// ```
|
||
Block,
|
||
/// Any module with a name.
|
||
///
|
||
/// This could be:
|
||
///
|
||
/// * A normal module – either `mod from_file;` or `mod from_block { }` –
|
||
/// or the crate root (which is conceptually a top-level module).
|
||
/// Note that the crate root's [name][Self::name] will be [`kw::Empty`].
|
||
/// * A trait or an enum (it implicitly contains associated types, methods and variant
|
||
/// constructors).
|
||
Def(DefKind, DefId, Symbol),
|
||
}
|
||
|
||
impl ModuleKind {
|
||
/// Get name of the module.
|
||
fn name(&self) -> Option<Symbol> {
|
||
match self {
|
||
ModuleKind::Block => None,
|
||
ModuleKind::Def(.., name) => Some(*name),
|
||
}
|
||
}
|
||
}
|
||
|
||
/// A key that identifies a binding in a given `Module`.
|
||
///
|
||
/// Multiple bindings in the same module can have the same key (in a valid
|
||
/// program) if all but one of them come from glob imports.
|
||
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
|
||
struct BindingKey {
|
||
/// The identifier for the binding, always the `normalize_to_macros_2_0` version of the
|
||
/// identifier.
|
||
ident: Ident,
|
||
ns: Namespace,
|
||
/// 0 if ident is not `_`, otherwise a value that's unique to the specific
|
||
/// `_` in the expanded AST that introduced this binding.
|
||
disambiguator: u32,
|
||
}
|
||
|
||
impl BindingKey {
|
||
fn new(ident: Ident, ns: Namespace) -> Self {
|
||
let ident = ident.normalize_to_macros_2_0();
|
||
BindingKey { ident, ns, disambiguator: 0 }
|
||
}
|
||
}
|
||
|
||
type Resolutions<'ra> = RefCell<FxIndexMap<BindingKey, &'ra RefCell<NameResolution<'ra>>>>;
|
||
|
||
/// One node in the tree of modules.
|
||
///
|
||
/// Note that a "module" in resolve is broader than a `mod` that you declare in Rust code. It may be one of these:
|
||
///
|
||
/// * `mod`
|
||
/// * crate root (aka, top-level anonymous module)
|
||
/// * `enum`
|
||
/// * `trait`
|
||
/// * curly-braced block with statements
|
||
///
|
||
/// You can use [`ModuleData::kind`] to determine the kind of module this is.
|
||
struct ModuleData<'ra> {
|
||
/// The direct parent module (it may not be a `mod`, however).
|
||
parent: Option<Module<'ra>>,
|
||
/// What kind of module this is, because this may not be a `mod`.
|
||
kind: ModuleKind,
|
||
|
||
/// Mapping between names and their (possibly in-progress) resolutions in this module.
|
||
/// Resolutions in modules from other crates are not populated until accessed.
|
||
lazy_resolutions: Resolutions<'ra>,
|
||
/// True if this is a module from other crate that needs to be populated on access.
|
||
populate_on_access: Cell<bool>,
|
||
|
||
/// Macro invocations that can expand into items in this module.
|
||
unexpanded_invocations: RefCell<FxHashSet<LocalExpnId>>,
|
||
|
||
/// Whether `#[no_implicit_prelude]` is active.
|
||
no_implicit_prelude: bool,
|
||
|
||
glob_importers: RefCell<Vec<Import<'ra>>>,
|
||
globs: RefCell<Vec<Import<'ra>>>,
|
||
|
||
/// Used to memoize the traits in this module for faster searches through all traits in scope.
|
||
traits: RefCell<Option<Box<[(Ident, NameBinding<'ra>)]>>>,
|
||
|
||
/// Span of the module itself. Used for error reporting.
|
||
span: Span,
|
||
|
||
expansion: ExpnId,
|
||
}
|
||
|
||
/// All modules are unique and allocated on a same arena,
|
||
/// so we can use referential equality to compare them.
|
||
#[derive(Clone, Copy, PartialEq, Eq, Hash)]
|
||
#[rustc_pass_by_value]
|
||
struct Module<'ra>(Interned<'ra, ModuleData<'ra>>);
|
||
|
||
impl<'ra> ModuleData<'ra> {
|
||
fn new(
|
||
parent: Option<Module<'ra>>,
|
||
kind: ModuleKind,
|
||
expansion: ExpnId,
|
||
span: Span,
|
||
no_implicit_prelude: bool,
|
||
) -> Self {
|
||
let is_foreign = match kind {
|
||
ModuleKind::Def(_, def_id, _) => !def_id.is_local(),
|
||
ModuleKind::Block => false,
|
||
};
|
||
ModuleData {
|
||
parent,
|
||
kind,
|
||
lazy_resolutions: Default::default(),
|
||
populate_on_access: Cell::new(is_foreign),
|
||
unexpanded_invocations: Default::default(),
|
||
no_implicit_prelude,
|
||
glob_importers: RefCell::new(Vec::new()),
|
||
globs: RefCell::new(Vec::new()),
|
||
traits: RefCell::new(None),
|
||
span,
|
||
expansion,
|
||
}
|
||
}
|
||
}
|
||
|
||
impl<'ra> Module<'ra> {
|
||
fn for_each_child<'tcx, R, F>(self, resolver: &mut R, mut f: F)
|
||
where
|
||
R: AsMut<Resolver<'ra, 'tcx>>,
|
||
F: FnMut(&mut R, Ident, Namespace, NameBinding<'ra>),
|
||
{
|
||
for (key, name_resolution) in resolver.as_mut().resolutions(self).borrow().iter() {
|
||
if let Some(binding) = name_resolution.borrow().binding {
|
||
f(resolver, key.ident, key.ns, binding);
|
||
}
|
||
}
|
||
}
|
||
|
||
/// This modifies `self` in place. The traits will be stored in `self.traits`.
|
||
fn ensure_traits<'tcx, R>(self, resolver: &mut R)
|
||
where
|
||
R: AsMut<Resolver<'ra, 'tcx>>,
|
||
{
|
||
let mut traits = self.traits.borrow_mut();
|
||
if traits.is_none() {
|
||
let mut collected_traits = Vec::new();
|
||
self.for_each_child(resolver, |_, name, ns, binding| {
|
||
if ns != TypeNS {
|
||
return;
|
||
}
|
||
if let Res::Def(DefKind::Trait | DefKind::TraitAlias, _) = binding.res() {
|
||
collected_traits.push((name, binding))
|
||
}
|
||
});
|
||
*traits = Some(collected_traits.into_boxed_slice());
|
||
}
|
||
}
|
||
|
||
fn res(self) -> Option<Res> {
|
||
match self.kind {
|
||
ModuleKind::Def(kind, def_id, _) => Some(Res::Def(kind, def_id)),
|
||
_ => None,
|
||
}
|
||
}
|
||
|
||
// Public for rustdoc.
|
||
fn def_id(self) -> DefId {
|
||
self.opt_def_id().expect("`ModuleData::def_id` is called on a block module")
|
||
}
|
||
|
||
fn opt_def_id(self) -> Option<DefId> {
|
||
match self.kind {
|
||
ModuleKind::Def(_, def_id, _) => Some(def_id),
|
||
_ => None,
|
||
}
|
||
}
|
||
|
||
// `self` resolves to the first module ancestor that `is_normal`.
|
||
fn is_normal(self) -> bool {
|
||
matches!(self.kind, ModuleKind::Def(DefKind::Mod, _, _))
|
||
}
|
||
|
||
fn is_trait(self) -> bool {
|
||
matches!(self.kind, ModuleKind::Def(DefKind::Trait, _, _))
|
||
}
|
||
|
||
fn nearest_item_scope(self) -> Module<'ra> {
|
||
match self.kind {
|
||
ModuleKind::Def(DefKind::Enum | DefKind::Trait, ..) => {
|
||
self.parent.expect("enum or trait module without a parent")
|
||
}
|
||
_ => self,
|
||
}
|
||
}
|
||
|
||
/// The [`DefId`] of the nearest `mod` item ancestor (which may be this module).
|
||
/// This may be the crate root.
|
||
fn nearest_parent_mod(self) -> DefId {
|
||
match self.kind {
|
||
ModuleKind::Def(DefKind::Mod, def_id, _) => def_id,
|
||
_ => self.parent.expect("non-root module without parent").nearest_parent_mod(),
|
||
}
|
||
}
|
||
|
||
fn is_ancestor_of(self, mut other: Self) -> bool {
|
||
while self != other {
|
||
if let Some(parent) = other.parent {
|
||
other = parent;
|
||
} else {
|
||
return false;
|
||
}
|
||
}
|
||
true
|
||
}
|
||
}
|
||
|
||
impl<'ra> std::ops::Deref for Module<'ra> {
|
||
type Target = ModuleData<'ra>;
|
||
|
||
fn deref(&self) -> &Self::Target {
|
||
&self.0
|
||
}
|
||
}
|
||
|
||
impl<'ra> fmt::Debug for Module<'ra> {
|
||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
write!(f, "{:?}", self.res())
|
||
}
|
||
}
|
||
|
||
/// Records a possibly-private value, type, or module definition.
|
||
#[derive(Clone, Copy, Debug)]
|
||
struct NameBindingData<'ra> {
|
||
kind: NameBindingKind<'ra>,
|
||
ambiguity: Option<(NameBinding<'ra>, AmbiguityKind)>,
|
||
/// Produce a warning instead of an error when reporting ambiguities inside this binding.
|
||
/// May apply to indirect ambiguities under imports, so `ambiguity.is_some()` is not required.
|
||
warn_ambiguity: bool,
|
||
expansion: LocalExpnId,
|
||
span: Span,
|
||
vis: ty::Visibility<DefId>,
|
||
}
|
||
|
||
/// All name bindings are unique and allocated on a same arena,
|
||
/// so we can use referential equality to compare them.
|
||
type NameBinding<'ra> = Interned<'ra, NameBindingData<'ra>>;
|
||
|
||
trait ToNameBinding<'ra> {
|
||
fn to_name_binding(self, arenas: &'ra ResolverArenas<'ra>) -> NameBinding<'ra>;
|
||
}
|
||
|
||
impl<'ra> ToNameBinding<'ra> for NameBinding<'ra> {
|
||
fn to_name_binding(self, _: &'ra ResolverArenas<'ra>) -> NameBinding<'ra> {
|
||
self
|
||
}
|
||
}
|
||
|
||
#[derive(Clone, Copy, Debug)]
|
||
enum NameBindingKind<'ra> {
|
||
Res(Res),
|
||
Module(Module<'ra>),
|
||
Import { binding: NameBinding<'ra>, import: Import<'ra> },
|
||
}
|
||
|
||
impl<'ra> NameBindingKind<'ra> {
|
||
/// Is this a name binding of an import?
|
||
fn is_import(&self) -> bool {
|
||
matches!(*self, NameBindingKind::Import { .. })
|
||
}
|
||
}
|
||
|
||
#[derive(Debug)]
|
||
struct PrivacyError<'ra> {
|
||
ident: Ident,
|
||
binding: NameBinding<'ra>,
|
||
dedup_span: Span,
|
||
outermost_res: Option<(Res, Ident)>,
|
||
parent_scope: ParentScope<'ra>,
|
||
/// Is the format `use a::{b,c}`?
|
||
single_nested: bool,
|
||
}
|
||
|
||
#[derive(Debug)]
|
||
struct UseError<'a> {
|
||
err: Diag<'a>,
|
||
/// Candidates which user could `use` to access the missing type.
|
||
candidates: Vec<ImportSuggestion>,
|
||
/// The `DefId` of the module to place the use-statements in.
|
||
def_id: DefId,
|
||
/// Whether the diagnostic should say "instead" (as in `consider importing ... instead`).
|
||
instead: bool,
|
||
/// Extra free-form suggestion.
|
||
suggestion: Option<(Span, &'static str, String, Applicability)>,
|
||
/// Path `Segment`s at the place of use that failed. Used for accurate suggestion after telling
|
||
/// the user to import the item directly.
|
||
path: Vec<Segment>,
|
||
/// Whether the expected source is a call
|
||
is_call: bool,
|
||
}
|
||
|
||
#[derive(Clone, Copy, PartialEq, Debug)]
|
||
enum AmbiguityKind {
|
||
BuiltinAttr,
|
||
DeriveHelper,
|
||
MacroRulesVsModularized,
|
||
GlobVsOuter,
|
||
GlobVsGlob,
|
||
GlobVsExpanded,
|
||
MoreExpandedVsOuter,
|
||
}
|
||
|
||
impl AmbiguityKind {
|
||
fn descr(self) -> &'static str {
|
||
match self {
|
||
AmbiguityKind::BuiltinAttr => "a name conflict with a builtin attribute",
|
||
AmbiguityKind::DeriveHelper => "a name conflict with a derive helper attribute",
|
||
AmbiguityKind::MacroRulesVsModularized => {
|
||
"a conflict between a `macro_rules` name and a non-`macro_rules` name from another module"
|
||
}
|
||
AmbiguityKind::GlobVsOuter => {
|
||
"a conflict between a name from a glob import and an outer scope during import or macro resolution"
|
||
}
|
||
AmbiguityKind::GlobVsGlob => "multiple glob imports of a name in the same module",
|
||
AmbiguityKind::GlobVsExpanded => {
|
||
"a conflict between a name from a glob import and a macro-expanded name in the same module during import or macro resolution"
|
||
}
|
||
AmbiguityKind::MoreExpandedVsOuter => {
|
||
"a conflict between a macro-expanded name and a less macro-expanded name from outer scope during import or macro resolution"
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Miscellaneous bits of metadata for better ambiguity error reporting.
|
||
#[derive(Clone, Copy, PartialEq)]
|
||
enum AmbiguityErrorMisc {
|
||
SuggestCrate,
|
||
SuggestSelf,
|
||
FromPrelude,
|
||
None,
|
||
}
|
||
|
||
struct AmbiguityError<'ra> {
|
||
kind: AmbiguityKind,
|
||
ident: Ident,
|
||
b1: NameBinding<'ra>,
|
||
b2: NameBinding<'ra>,
|
||
misc1: AmbiguityErrorMisc,
|
||
misc2: AmbiguityErrorMisc,
|
||
warning: bool,
|
||
}
|
||
|
||
impl<'ra> NameBindingData<'ra> {
|
||
fn module(&self) -> Option<Module<'ra>> {
|
||
match self.kind {
|
||
NameBindingKind::Module(module) => Some(module),
|
||
NameBindingKind::Import { binding, .. } => binding.module(),
|
||
_ => None,
|
||
}
|
||
}
|
||
|
||
fn res(&self) -> Res {
|
||
match self.kind {
|
||
NameBindingKind::Res(res) => res,
|
||
NameBindingKind::Module(module) => module.res().unwrap(),
|
||
NameBindingKind::Import { binding, .. } => binding.res(),
|
||
}
|
||
}
|
||
|
||
fn is_ambiguity_recursive(&self) -> bool {
|
||
self.ambiguity.is_some()
|
||
|| match self.kind {
|
||
NameBindingKind::Import { binding, .. } => binding.is_ambiguity_recursive(),
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
fn warn_ambiguity_recursive(&self) -> bool {
|
||
self.warn_ambiguity
|
||
|| match self.kind {
|
||
NameBindingKind::Import { binding, .. } => binding.warn_ambiguity_recursive(),
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
fn is_possibly_imported_variant(&self) -> bool {
|
||
match self.kind {
|
||
NameBindingKind::Import { binding, .. } => binding.is_possibly_imported_variant(),
|
||
NameBindingKind::Res(Res::Def(
|
||
DefKind::Variant | DefKind::Ctor(CtorOf::Variant, ..),
|
||
_,
|
||
)) => true,
|
||
NameBindingKind::Res(..) | NameBindingKind::Module(..) => false,
|
||
}
|
||
}
|
||
|
||
fn is_extern_crate(&self) -> bool {
|
||
match self.kind {
|
||
NameBindingKind::Import { import, .. } => {
|
||
matches!(import.kind, ImportKind::ExternCrate { .. })
|
||
}
|
||
NameBindingKind::Module(module)
|
||
if let ModuleKind::Def(DefKind::Mod, def_id, _) = module.kind =>
|
||
{
|
||
def_id.is_crate_root()
|
||
}
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
fn is_import(&self) -> bool {
|
||
matches!(self.kind, NameBindingKind::Import { .. })
|
||
}
|
||
|
||
/// The binding introduced by `#[macro_export] macro_rules` is a public import, but it might
|
||
/// not be perceived as such by users, so treat it as a non-import in some diagnostics.
|
||
fn is_import_user_facing(&self) -> bool {
|
||
matches!(self.kind, NameBindingKind::Import { import, .. }
|
||
if !matches!(import.kind, ImportKind::MacroExport))
|
||
}
|
||
|
||
fn is_glob_import(&self) -> bool {
|
||
match self.kind {
|
||
NameBindingKind::Import { import, .. } => import.is_glob(),
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
fn is_importable(&self) -> bool {
|
||
!matches!(
|
||
self.res(),
|
||
Res::Def(DefKind::AssocConst | DefKind::AssocFn | DefKind::AssocTy, _)
|
||
)
|
||
}
|
||
|
||
fn macro_kind(&self) -> Option<MacroKind> {
|
||
self.res().macro_kind()
|
||
}
|
||
|
||
// Suppose that we resolved macro invocation with `invoc_parent_expansion` to binding `binding`
|
||
// at some expansion round `max(invoc, binding)` when they both emerged from macros.
|
||
// Then this function returns `true` if `self` may emerge from a macro *after* that
|
||
// in some later round and screw up our previously found resolution.
|
||
// See more detailed explanation in
|
||
// https://github.com/rust-lang/rust/pull/53778#issuecomment-419224049
|
||
fn may_appear_after(
|
||
&self,
|
||
invoc_parent_expansion: LocalExpnId,
|
||
binding: NameBinding<'_>,
|
||
) -> bool {
|
||
// self > max(invoc, binding) => !(self <= invoc || self <= binding)
|
||
// Expansions are partially ordered, so "may appear after" is an inversion of
|
||
// "certainly appears before or simultaneously" and includes unordered cases.
|
||
let self_parent_expansion = self.expansion;
|
||
let other_parent_expansion = binding.expansion;
|
||
let certainly_before_other_or_simultaneously =
|
||
other_parent_expansion.is_descendant_of(self_parent_expansion);
|
||
let certainly_before_invoc_or_simultaneously =
|
||
invoc_parent_expansion.is_descendant_of(self_parent_expansion);
|
||
!(certainly_before_other_or_simultaneously || certainly_before_invoc_or_simultaneously)
|
||
}
|
||
|
||
// Its purpose is to postpone the determination of a single binding because
|
||
// we can't predict whether it will be overwritten by recently expanded macros.
|
||
// FIXME: How can we integrate it with the `update_resolution`?
|
||
fn determined(&self) -> bool {
|
||
match &self.kind {
|
||
NameBindingKind::Import { binding, import, .. } if import.is_glob() => {
|
||
import.parent_scope.module.unexpanded_invocations.borrow().is_empty()
|
||
&& binding.determined()
|
||
}
|
||
_ => true,
|
||
}
|
||
}
|
||
}
|
||
|
||
#[derive(Default, Clone)]
|
||
struct ExternPreludeEntry<'ra> {
|
||
binding: Option<NameBinding<'ra>>,
|
||
introduced_by_item: bool,
|
||
}
|
||
|
||
impl ExternPreludeEntry<'_> {
|
||
fn is_import(&self) -> bool {
|
||
self.binding.is_some_and(|binding| binding.is_import())
|
||
}
|
||
}
|
||
|
||
/// Used for better errors for E0773
|
||
enum BuiltinMacroState {
|
||
NotYetSeen(SyntaxExtensionKind),
|
||
AlreadySeen(Span),
|
||
}
|
||
|
||
struct DeriveData {
|
||
resolutions: Vec<DeriveResolution>,
|
||
helper_attrs: Vec<(usize, Ident)>,
|
||
has_derive_copy: bool,
|
||
}
|
||
|
||
struct MacroData {
|
||
ext: Lrc<SyntaxExtension>,
|
||
rule_spans: Vec<(usize, Span)>,
|
||
macro_rules: bool,
|
||
}
|
||
|
||
impl MacroData {
|
||
fn new(ext: Lrc<SyntaxExtension>) -> MacroData {
|
||
MacroData { ext, rule_spans: Vec::new(), macro_rules: false }
|
||
}
|
||
}
|
||
|
||
/// The main resolver class.
|
||
///
|
||
/// This is the visitor that walks the whole crate.
|
||
pub struct Resolver<'ra, 'tcx> {
|
||
tcx: TyCtxt<'tcx>,
|
||
|
||
/// Item with a given `LocalDefId` was defined during macro expansion with ID `ExpnId`.
|
||
expn_that_defined: FxHashMap<LocalDefId, ExpnId>,
|
||
|
||
graph_root: Module<'ra>,
|
||
|
||
prelude: Option<Module<'ra>>,
|
||
extern_prelude: FxHashMap<Ident, ExternPreludeEntry<'ra>>,
|
||
|
||
/// N.B., this is used only for better diagnostics, not name resolution itself.
|
||
field_names: LocalDefIdMap<Vec<Ident>>,
|
||
|
||
/// Span of the privacy modifier in fields of an item `DefId` accessible with dot syntax.
|
||
/// Used for hints during error reporting.
|
||
field_visibility_spans: FxHashMap<DefId, Vec<Span>>,
|
||
|
||
/// All imports known to succeed or fail.
|
||
determined_imports: Vec<Import<'ra>>,
|
||
|
||
/// All non-determined imports.
|
||
indeterminate_imports: Vec<Import<'ra>>,
|
||
|
||
// Spans for local variables found during pattern resolution.
|
||
// Used for suggestions during error reporting.
|
||
pat_span_map: NodeMap<Span>,
|
||
|
||
/// Resolutions for nodes that have a single resolution.
|
||
partial_res_map: NodeMap<PartialRes>,
|
||
/// Resolutions for import nodes, which have multiple resolutions in different namespaces.
|
||
import_res_map: NodeMap<PerNS<Option<Res>>>,
|
||
/// An import will be inserted into this map if it has been used.
|
||
import_use_map: FxHashMap<Import<'ra>, Used>,
|
||
/// Resolutions for labels (node IDs of their corresponding blocks or loops).
|
||
label_res_map: NodeMap<NodeId>,
|
||
/// Resolutions for lifetimes.
|
||
lifetimes_res_map: NodeMap<LifetimeRes>,
|
||
/// Lifetime parameters that lowering will have to introduce.
|
||
extra_lifetime_params_map: NodeMap<Vec<(Ident, NodeId, LifetimeRes)>>,
|
||
|
||
/// `CrateNum` resolutions of `extern crate` items.
|
||
extern_crate_map: FxHashMap<LocalDefId, CrateNum>,
|
||
module_children: LocalDefIdMap<Vec<ModChild>>,
|
||
trait_map: NodeMap<Vec<TraitCandidate>>,
|
||
|
||
/// A map from nodes to anonymous modules.
|
||
/// Anonymous modules are pseudo-modules that are implicitly created around items
|
||
/// contained within blocks.
|
||
///
|
||
/// For example, if we have this:
|
||
///
|
||
/// fn f() {
|
||
/// fn g() {
|
||
/// ...
|
||
/// }
|
||
/// }
|
||
///
|
||
/// There will be an anonymous module created around `g` with the ID of the
|
||
/// entry block for `f`.
|
||
block_map: NodeMap<Module<'ra>>,
|
||
/// A fake module that contains no definition and no prelude. Used so that
|
||
/// some AST passes can generate identifiers that only resolve to local or
|
||
/// lang items.
|
||
empty_module: Module<'ra>,
|
||
module_map: FxHashMap<DefId, Module<'ra>>,
|
||
binding_parent_modules: FxHashMap<NameBinding<'ra>, Module<'ra>>,
|
||
|
||
underscore_disambiguator: u32,
|
||
/// Disambiguator for anonymous adts.
|
||
empty_disambiguator: u32,
|
||
|
||
/// Maps glob imports to the names of items actually imported.
|
||
glob_map: FxHashMap<LocalDefId, FxHashSet<Symbol>>,
|
||
glob_error: Option<ErrorGuaranteed>,
|
||
visibilities_for_hashing: Vec<(LocalDefId, ty::Visibility)>,
|
||
used_imports: FxHashSet<NodeId>,
|
||
maybe_unused_trait_imports: FxIndexSet<LocalDefId>,
|
||
|
||
/// Privacy errors are delayed until the end in order to deduplicate them.
|
||
privacy_errors: Vec<PrivacyError<'ra>>,
|
||
/// Ambiguity errors are delayed for deduplication.
|
||
ambiguity_errors: Vec<AmbiguityError<'ra>>,
|
||
/// `use` injections are delayed for better placement and deduplication.
|
||
use_injections: Vec<UseError<'tcx>>,
|
||
/// Crate-local macro expanded `macro_export` referred to by a module-relative path.
|
||
macro_expanded_macro_export_errors: BTreeSet<(Span, Span)>,
|
||
|
||
arenas: &'ra ResolverArenas<'ra>,
|
||
dummy_binding: NameBinding<'ra>,
|
||
builtin_types_bindings: FxHashMap<Symbol, NameBinding<'ra>>,
|
||
builtin_attrs_bindings: FxHashMap<Symbol, NameBinding<'ra>>,
|
||
registered_tool_bindings: FxHashMap<Ident, NameBinding<'ra>>,
|
||
/// Binding for implicitly declared names that come with a module,
|
||
/// like `self` (not yet used), or `crate`/`$crate` (for root modules).
|
||
module_self_bindings: FxHashMap<Module<'ra>, NameBinding<'ra>>,
|
||
|
||
used_extern_options: FxHashSet<Symbol>,
|
||
macro_names: FxHashSet<Ident>,
|
||
builtin_macros: FxHashMap<Symbol, BuiltinMacroState>,
|
||
registered_tools: &'tcx RegisteredTools,
|
||
macro_use_prelude: FxHashMap<Symbol, NameBinding<'ra>>,
|
||
macro_map: FxHashMap<DefId, MacroData>,
|
||
dummy_ext_bang: Lrc<SyntaxExtension>,
|
||
dummy_ext_derive: Lrc<SyntaxExtension>,
|
||
non_macro_attr: MacroData,
|
||
local_macro_def_scopes: FxHashMap<LocalDefId, Module<'ra>>,
|
||
ast_transform_scopes: FxHashMap<LocalExpnId, Module<'ra>>,
|
||
unused_macros: FxHashMap<LocalDefId, (NodeId, Ident)>,
|
||
/// A map from the macro to all its potentially unused arms.
|
||
unused_macro_rules: FxIndexMap<LocalDefId, FxHashMap<usize, (Ident, Span)>>,
|
||
proc_macro_stubs: FxHashSet<LocalDefId>,
|
||
/// Traces collected during macro resolution and validated when it's complete.
|
||
single_segment_macro_resolutions:
|
||
Vec<(Ident, MacroKind, ParentScope<'ra>, Option<NameBinding<'ra>>)>,
|
||
multi_segment_macro_resolutions:
|
||
Vec<(Vec<Segment>, Span, MacroKind, ParentScope<'ra>, Option<Res>, Namespace)>,
|
||
builtin_attrs: Vec<(Ident, ParentScope<'ra>)>,
|
||
/// `derive(Copy)` marks items they are applied to so they are treated specially later.
|
||
/// Derive macros cannot modify the item themselves and have to store the markers in the global
|
||
/// context, so they attach the markers to derive container IDs using this resolver table.
|
||
containers_deriving_copy: FxHashSet<LocalExpnId>,
|
||
/// Parent scopes in which the macros were invoked.
|
||
/// FIXME: `derives` are missing in these parent scopes and need to be taken from elsewhere.
|
||
invocation_parent_scopes: FxHashMap<LocalExpnId, ParentScope<'ra>>,
|
||
/// `macro_rules` scopes *produced* by expanding the macro invocations,
|
||
/// include all the `macro_rules` items and other invocations generated by them.
|
||
output_macro_rules_scopes: FxHashMap<LocalExpnId, MacroRulesScopeRef<'ra>>,
|
||
/// `macro_rules` scopes produced by `macro_rules` item definitions.
|
||
macro_rules_scopes: FxHashMap<LocalDefId, MacroRulesScopeRef<'ra>>,
|
||
/// Helper attributes that are in scope for the given expansion.
|
||
helper_attrs: FxHashMap<LocalExpnId, Vec<(Ident, NameBinding<'ra>)>>,
|
||
/// Ready or in-progress results of resolving paths inside the `#[derive(...)]` attribute
|
||
/// with the given `ExpnId`.
|
||
derive_data: FxHashMap<LocalExpnId, DeriveData>,
|
||
|
||
/// Avoid duplicated errors for "name already defined".
|
||
name_already_seen: FxHashMap<Symbol, Span>,
|
||
|
||
potentially_unused_imports: Vec<Import<'ra>>,
|
||
|
||
potentially_unnecessary_qualifications: Vec<UnnecessaryQualification<'ra>>,
|
||
|
||
/// Table for mapping struct IDs into struct constructor IDs,
|
||
/// it's not used during normal resolution, only for better error reporting.
|
||
/// Also includes of list of each fields visibility
|
||
struct_constructors: LocalDefIdMap<(Res, ty::Visibility<DefId>, Vec<ty::Visibility<DefId>>)>,
|
||
|
||
lint_buffer: LintBuffer,
|
||
|
||
next_node_id: NodeId,
|
||
|
||
node_id_to_def_id: NodeMap<Feed<'tcx, LocalDefId>>,
|
||
def_id_to_node_id: IndexVec<LocalDefId, ast::NodeId>,
|
||
|
||
/// Indices of unnamed struct or variant fields with unresolved attributes.
|
||
placeholder_field_indices: FxHashMap<NodeId, usize>,
|
||
/// When collecting definitions from an AST fragment produced by a macro invocation `ExpnId`
|
||
/// we know what parent node that fragment should be attached to thanks to this table,
|
||
/// and how the `impl Trait` fragments were introduced.
|
||
invocation_parents: FxHashMap<LocalExpnId, InvocationParent>,
|
||
|
||
/// Some way to know that we are in a *trait* impl in `visit_assoc_item`.
|
||
/// FIXME: Replace with a more general AST map (together with some other fields).
|
||
trait_impl_items: FxHashSet<LocalDefId>,
|
||
|
||
legacy_const_generic_args: FxHashMap<DefId, Option<Vec<usize>>>,
|
||
/// Amount of lifetime parameters for each item in the crate.
|
||
item_generics_num_lifetimes: FxHashMap<LocalDefId, usize>,
|
||
delegation_fn_sigs: LocalDefIdMap<DelegationFnSig>,
|
||
|
||
main_def: Option<MainDefinition>,
|
||
trait_impls: FxIndexMap<DefId, Vec<LocalDefId>>,
|
||
/// A list of proc macro LocalDefIds, written out in the order in which
|
||
/// they are declared in the static array generated by proc_macro_harness.
|
||
proc_macros: Vec<NodeId>,
|
||
confused_type_with_std_module: FxIndexMap<Span, Span>,
|
||
/// Whether lifetime elision was successful.
|
||
lifetime_elision_allowed: FxHashSet<NodeId>,
|
||
|
||
/// Names of items that were stripped out via cfg with their corresponding cfg meta item.
|
||
stripped_cfg_items: Vec<StrippedCfgItem<NodeId>>,
|
||
|
||
effective_visibilities: EffectiveVisibilities,
|
||
doc_link_resolutions: FxIndexMap<LocalDefId, DocLinkResMap>,
|
||
doc_link_traits_in_scope: FxIndexMap<LocalDefId, Vec<DefId>>,
|
||
all_macro_rules: FxHashMap<Symbol, Res>,
|
||
|
||
/// Invocation ids of all glob delegations.
|
||
glob_delegation_invoc_ids: FxHashSet<LocalExpnId>,
|
||
/// Analogue of module `unexpanded_invocations` but in trait impls, excluding glob delegations.
|
||
/// Needed because glob delegations wait for all other neighboring macros to expand.
|
||
impl_unexpanded_invocations: FxHashMap<LocalDefId, FxHashSet<LocalExpnId>>,
|
||
/// Simplified analogue of module `resolutions` but in trait impls, excluding glob delegations.
|
||
/// Needed because glob delegations exclude explicitly defined names.
|
||
impl_binding_keys: FxHashMap<LocalDefId, FxHashSet<BindingKey>>,
|
||
|
||
/// This is the `Span` where an `extern crate foo;` suggestion would be inserted, if `foo`
|
||
/// could be a crate that wasn't imported. For diagnostics use only.
|
||
current_crate_outer_attr_insert_span: Span,
|
||
}
|
||
|
||
/// This provides memory for the rest of the crate. The `'ra` lifetime that is
|
||
/// used by many types in this crate is an abbreviation of `ResolverArenas`.
|
||
#[derive(Default)]
|
||
pub struct ResolverArenas<'ra> {
|
||
modules: TypedArena<ModuleData<'ra>>,
|
||
local_modules: RefCell<Vec<Module<'ra>>>,
|
||
imports: TypedArena<ImportData<'ra>>,
|
||
name_resolutions: TypedArena<RefCell<NameResolution<'ra>>>,
|
||
ast_paths: TypedArena<ast::Path>,
|
||
dropless: DroplessArena,
|
||
}
|
||
|
||
impl<'ra> ResolverArenas<'ra> {
|
||
fn new_module(
|
||
&'ra self,
|
||
parent: Option<Module<'ra>>,
|
||
kind: ModuleKind,
|
||
expn_id: ExpnId,
|
||
span: Span,
|
||
no_implicit_prelude: bool,
|
||
module_map: &mut FxHashMap<DefId, Module<'ra>>,
|
||
module_self_bindings: &mut FxHashMap<Module<'ra>, NameBinding<'ra>>,
|
||
) -> Module<'ra> {
|
||
let module = Module(Interned::new_unchecked(self.modules.alloc(ModuleData::new(
|
||
parent,
|
||
kind,
|
||
expn_id,
|
||
span,
|
||
no_implicit_prelude,
|
||
))));
|
||
let def_id = module.opt_def_id();
|
||
if def_id.map_or(true, |def_id| def_id.is_local()) {
|
||
self.local_modules.borrow_mut().push(module);
|
||
}
|
||
if let Some(def_id) = def_id {
|
||
module_map.insert(def_id, module);
|
||
let vis = ty::Visibility::<DefId>::Public;
|
||
let binding = (module, vis, module.span, LocalExpnId::ROOT).to_name_binding(self);
|
||
module_self_bindings.insert(module, binding);
|
||
}
|
||
module
|
||
}
|
||
fn local_modules(&'ra self) -> std::cell::Ref<'ra, Vec<Module<'ra>>> {
|
||
self.local_modules.borrow()
|
||
}
|
||
fn alloc_name_binding(&'ra self, name_binding: NameBindingData<'ra>) -> NameBinding<'ra> {
|
||
Interned::new_unchecked(self.dropless.alloc(name_binding))
|
||
}
|
||
fn alloc_import(&'ra self, import: ImportData<'ra>) -> Import<'ra> {
|
||
Interned::new_unchecked(self.imports.alloc(import))
|
||
}
|
||
fn alloc_name_resolution(&'ra self) -> &'ra RefCell<NameResolution<'ra>> {
|
||
self.name_resolutions.alloc(Default::default())
|
||
}
|
||
fn alloc_macro_rules_scope(&'ra self, scope: MacroRulesScope<'ra>) -> MacroRulesScopeRef<'ra> {
|
||
Interned::new_unchecked(self.dropless.alloc(Cell::new(scope)))
|
||
}
|
||
fn alloc_macro_rules_binding(
|
||
&'ra self,
|
||
binding: MacroRulesBinding<'ra>,
|
||
) -> &'ra MacroRulesBinding<'ra> {
|
||
self.dropless.alloc(binding)
|
||
}
|
||
fn alloc_ast_paths(&'ra self, paths: &[ast::Path]) -> &'ra [ast::Path] {
|
||
self.ast_paths.alloc_from_iter(paths.iter().cloned())
|
||
}
|
||
fn alloc_pattern_spans(&'ra self, spans: impl Iterator<Item = Span>) -> &'ra [Span] {
|
||
self.dropless.alloc_from_iter(spans)
|
||
}
|
||
}
|
||
|
||
impl<'ra, 'tcx> AsMut<Resolver<'ra, 'tcx>> for Resolver<'ra, 'tcx> {
|
||
fn as_mut(&mut self) -> &mut Resolver<'ra, 'tcx> {
|
||
self
|
||
}
|
||
}
|
||
|
||
impl<'tcx> Resolver<'_, 'tcx> {
|
||
fn opt_local_def_id(&self, node: NodeId) -> Option<LocalDefId> {
|
||
self.opt_feed(node).map(|f| f.key())
|
||
}
|
||
|
||
fn local_def_id(&self, node: NodeId) -> LocalDefId {
|
||
self.feed(node).key()
|
||
}
|
||
|
||
fn opt_feed(&self, node: NodeId) -> Option<Feed<'tcx, LocalDefId>> {
|
||
self.node_id_to_def_id.get(&node).copied()
|
||
}
|
||
|
||
fn feed(&self, node: NodeId) -> Feed<'tcx, LocalDefId> {
|
||
self.opt_feed(node).unwrap_or_else(|| panic!("no entry for node id: `{node:?}`"))
|
||
}
|
||
|
||
fn local_def_kind(&self, node: NodeId) -> DefKind {
|
||
self.tcx.def_kind(self.local_def_id(node))
|
||
}
|
||
|
||
/// Adds a definition with a parent definition.
|
||
fn create_def(
|
||
&mut self,
|
||
parent: LocalDefId,
|
||
node_id: ast::NodeId,
|
||
name: Symbol,
|
||
def_kind: DefKind,
|
||
expn_id: ExpnId,
|
||
span: Span,
|
||
) -> TyCtxtFeed<'tcx, LocalDefId> {
|
||
let data = def_kind.def_path_data(name);
|
||
assert!(
|
||
!self.node_id_to_def_id.contains_key(&node_id),
|
||
"adding a def'n for node-id {:?} and data {:?} but a previous def'n exists: {:?}",
|
||
node_id,
|
||
data,
|
||
self.tcx.definitions_untracked().def_key(self.node_id_to_def_id[&node_id].key()),
|
||
);
|
||
|
||
// FIXME: remove `def_span` body, pass in the right spans here and call `tcx.at().create_def()`
|
||
let feed = self.tcx.create_def(parent, name, def_kind);
|
||
let def_id = feed.def_id();
|
||
|
||
// Create the definition.
|
||
if expn_id != ExpnId::root() {
|
||
self.expn_that_defined.insert(def_id, expn_id);
|
||
}
|
||
|
||
// A relative span's parent must be an absolute span.
|
||
debug_assert_eq!(span.data_untracked().parent, None);
|
||
let _id = self.tcx.untracked().source_span.push(span);
|
||
debug_assert_eq!(_id, def_id);
|
||
|
||
// Some things for which we allocate `LocalDefId`s don't correspond to
|
||
// anything in the AST, so they don't have a `NodeId`. For these cases
|
||
// we don't need a mapping from `NodeId` to `LocalDefId`.
|
||
if node_id != ast::DUMMY_NODE_ID {
|
||
debug!("create_def: def_id_to_node_id[{:?}] <-> {:?}", def_id, node_id);
|
||
self.node_id_to_def_id.insert(node_id, feed.downgrade());
|
||
}
|
||
assert_eq!(self.def_id_to_node_id.push(node_id), def_id);
|
||
|
||
feed
|
||
}
|
||
|
||
fn item_generics_num_lifetimes(&self, def_id: DefId) -> usize {
|
||
if let Some(def_id) = def_id.as_local() {
|
||
self.item_generics_num_lifetimes[&def_id]
|
||
} else {
|
||
self.tcx.generics_of(def_id).own_counts().lifetimes
|
||
}
|
||
}
|
||
|
||
pub fn tcx(&self) -> TyCtxt<'tcx> {
|
||
self.tcx
|
||
}
|
||
}
|
||
|
||
impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
|
||
pub fn new(
|
||
tcx: TyCtxt<'tcx>,
|
||
attrs: &[ast::Attribute],
|
||
crate_span: Span,
|
||
current_crate_outer_attr_insert_span: Span,
|
||
arenas: &'ra ResolverArenas<'ra>,
|
||
) -> Resolver<'ra, 'tcx> {
|
||
let root_def_id = CRATE_DEF_ID.to_def_id();
|
||
let mut module_map = FxHashMap::default();
|
||
let mut module_self_bindings = FxHashMap::default();
|
||
let graph_root = arenas.new_module(
|
||
None,
|
||
ModuleKind::Def(DefKind::Mod, root_def_id, kw::Empty),
|
||
ExpnId::root(),
|
||
crate_span,
|
||
attr::contains_name(attrs, sym::no_implicit_prelude),
|
||
&mut module_map,
|
||
&mut module_self_bindings,
|
||
);
|
||
let empty_module = arenas.new_module(
|
||
None,
|
||
ModuleKind::Def(DefKind::Mod, root_def_id, kw::Empty),
|
||
ExpnId::root(),
|
||
DUMMY_SP,
|
||
true,
|
||
&mut FxHashMap::default(),
|
||
&mut FxHashMap::default(),
|
||
);
|
||
|
||
let mut def_id_to_node_id = IndexVec::default();
|
||
assert_eq!(def_id_to_node_id.push(CRATE_NODE_ID), CRATE_DEF_ID);
|
||
let mut node_id_to_def_id = NodeMap::default();
|
||
let crate_feed = tcx.create_local_crate_def_id(crate_span);
|
||
|
||
crate_feed.def_kind(DefKind::Mod);
|
||
let crate_feed = crate_feed.downgrade();
|
||
node_id_to_def_id.insert(CRATE_NODE_ID, crate_feed);
|
||
|
||
let mut invocation_parents = FxHashMap::default();
|
||
invocation_parents.insert(LocalExpnId::ROOT, InvocationParent::ROOT);
|
||
|
||
let mut extern_prelude: FxHashMap<Ident, ExternPreludeEntry<'_>> = tcx
|
||
.sess
|
||
.opts
|
||
.externs
|
||
.iter()
|
||
.filter(|(_, entry)| entry.add_prelude)
|
||
.map(|(name, _)| (Ident::from_str(name), Default::default()))
|
||
.collect();
|
||
|
||
if !attr::contains_name(attrs, sym::no_core) {
|
||
extern_prelude.insert(Ident::with_dummy_span(sym::core), Default::default());
|
||
if !attr::contains_name(attrs, sym::no_std) {
|
||
extern_prelude.insert(Ident::with_dummy_span(sym::std), Default::default());
|
||
}
|
||
}
|
||
|
||
let registered_tools = tcx.registered_tools(());
|
||
|
||
let pub_vis = ty::Visibility::<DefId>::Public;
|
||
let edition = tcx.sess.edition();
|
||
|
||
let mut resolver = Resolver {
|
||
tcx,
|
||
|
||
expn_that_defined: Default::default(),
|
||
|
||
// The outermost module has def ID 0; this is not reflected in the
|
||
// AST.
|
||
graph_root,
|
||
prelude: None,
|
||
extern_prelude,
|
||
|
||
field_names: Default::default(),
|
||
field_visibility_spans: FxHashMap::default(),
|
||
|
||
determined_imports: Vec::new(),
|
||
indeterminate_imports: Vec::new(),
|
||
|
||
pat_span_map: Default::default(),
|
||
partial_res_map: Default::default(),
|
||
import_res_map: Default::default(),
|
||
import_use_map: Default::default(),
|
||
label_res_map: Default::default(),
|
||
lifetimes_res_map: Default::default(),
|
||
extra_lifetime_params_map: Default::default(),
|
||
extern_crate_map: Default::default(),
|
||
module_children: Default::default(),
|
||
trait_map: NodeMap::default(),
|
||
underscore_disambiguator: 0,
|
||
empty_disambiguator: 0,
|
||
empty_module,
|
||
module_map,
|
||
block_map: Default::default(),
|
||
binding_parent_modules: FxHashMap::default(),
|
||
ast_transform_scopes: FxHashMap::default(),
|
||
|
||
glob_map: Default::default(),
|
||
glob_error: None,
|
||
visibilities_for_hashing: Default::default(),
|
||
used_imports: FxHashSet::default(),
|
||
maybe_unused_trait_imports: Default::default(),
|
||
|
||
privacy_errors: Vec::new(),
|
||
ambiguity_errors: Vec::new(),
|
||
use_injections: Vec::new(),
|
||
macro_expanded_macro_export_errors: BTreeSet::new(),
|
||
|
||
arenas,
|
||
dummy_binding: (Res::Err, pub_vis, DUMMY_SP, LocalExpnId::ROOT).to_name_binding(arenas),
|
||
builtin_types_bindings: PrimTy::ALL
|
||
.iter()
|
||
.map(|prim_ty| {
|
||
let binding = (Res::PrimTy(*prim_ty), pub_vis, DUMMY_SP, LocalExpnId::ROOT)
|
||
.to_name_binding(arenas);
|
||
(prim_ty.name(), binding)
|
||
})
|
||
.collect(),
|
||
builtin_attrs_bindings: BUILTIN_ATTRIBUTES
|
||
.iter()
|
||
.map(|builtin_attr| {
|
||
let res = Res::NonMacroAttr(NonMacroAttrKind::Builtin(builtin_attr.name));
|
||
let binding =
|
||
(res, pub_vis, DUMMY_SP, LocalExpnId::ROOT).to_name_binding(arenas);
|
||
(builtin_attr.name, binding)
|
||
})
|
||
.collect(),
|
||
registered_tool_bindings: registered_tools
|
||
.iter()
|
||
.map(|ident| {
|
||
let binding = (Res::ToolMod, pub_vis, ident.span, LocalExpnId::ROOT)
|
||
.to_name_binding(arenas);
|
||
(*ident, binding)
|
||
})
|
||
.collect(),
|
||
module_self_bindings,
|
||
|
||
used_extern_options: Default::default(),
|
||
macro_names: FxHashSet::default(),
|
||
builtin_macros: Default::default(),
|
||
registered_tools,
|
||
macro_use_prelude: FxHashMap::default(),
|
||
macro_map: FxHashMap::default(),
|
||
dummy_ext_bang: Lrc::new(SyntaxExtension::dummy_bang(edition)),
|
||
dummy_ext_derive: Lrc::new(SyntaxExtension::dummy_derive(edition)),
|
||
non_macro_attr: MacroData::new(Lrc::new(SyntaxExtension::non_macro_attr(edition))),
|
||
invocation_parent_scopes: Default::default(),
|
||
output_macro_rules_scopes: Default::default(),
|
||
macro_rules_scopes: Default::default(),
|
||
helper_attrs: Default::default(),
|
||
derive_data: Default::default(),
|
||
local_macro_def_scopes: FxHashMap::default(),
|
||
name_already_seen: FxHashMap::default(),
|
||
potentially_unused_imports: Vec::new(),
|
||
potentially_unnecessary_qualifications: Default::default(),
|
||
struct_constructors: Default::default(),
|
||
unused_macros: Default::default(),
|
||
unused_macro_rules: Default::default(),
|
||
proc_macro_stubs: Default::default(),
|
||
single_segment_macro_resolutions: Default::default(),
|
||
multi_segment_macro_resolutions: Default::default(),
|
||
builtin_attrs: Default::default(),
|
||
containers_deriving_copy: Default::default(),
|
||
lint_buffer: LintBuffer::default(),
|
||
next_node_id: CRATE_NODE_ID,
|
||
node_id_to_def_id,
|
||
def_id_to_node_id,
|
||
placeholder_field_indices: Default::default(),
|
||
invocation_parents,
|
||
trait_impl_items: Default::default(),
|
||
legacy_const_generic_args: Default::default(),
|
||
item_generics_num_lifetimes: Default::default(),
|
||
main_def: Default::default(),
|
||
trait_impls: Default::default(),
|
||
proc_macros: Default::default(),
|
||
confused_type_with_std_module: Default::default(),
|
||
lifetime_elision_allowed: Default::default(),
|
||
stripped_cfg_items: Default::default(),
|
||
effective_visibilities: Default::default(),
|
||
doc_link_resolutions: Default::default(),
|
||
doc_link_traits_in_scope: Default::default(),
|
||
all_macro_rules: Default::default(),
|
||
delegation_fn_sigs: Default::default(),
|
||
glob_delegation_invoc_ids: Default::default(),
|
||
impl_unexpanded_invocations: Default::default(),
|
||
impl_binding_keys: Default::default(),
|
||
current_crate_outer_attr_insert_span,
|
||
};
|
||
|
||
let root_parent_scope = ParentScope::module(graph_root, &resolver);
|
||
resolver.invocation_parent_scopes.insert(LocalExpnId::ROOT, root_parent_scope);
|
||
resolver.feed_visibility(crate_feed, ty::Visibility::Public);
|
||
|
||
resolver
|
||
}
|
||
|
||
fn new_module(
|
||
&mut self,
|
||
parent: Option<Module<'ra>>,
|
||
kind: ModuleKind,
|
||
expn_id: ExpnId,
|
||
span: Span,
|
||
no_implicit_prelude: bool,
|
||
) -> Module<'ra> {
|
||
let module_map = &mut self.module_map;
|
||
let module_self_bindings = &mut self.module_self_bindings;
|
||
self.arenas.new_module(
|
||
parent,
|
||
kind,
|
||
expn_id,
|
||
span,
|
||
no_implicit_prelude,
|
||
module_map,
|
||
module_self_bindings,
|
||
)
|
||
}
|
||
|
||
fn next_node_id(&mut self) -> NodeId {
|
||
let start = self.next_node_id;
|
||
let next = start.as_u32().checked_add(1).expect("input too large; ran out of NodeIds");
|
||
self.next_node_id = ast::NodeId::from_u32(next);
|
||
start
|
||
}
|
||
|
||
fn next_node_ids(&mut self, count: usize) -> std::ops::Range<NodeId> {
|
||
let start = self.next_node_id;
|
||
let end = start.as_usize().checked_add(count).expect("input too large; ran out of NodeIds");
|
||
self.next_node_id = ast::NodeId::from_usize(end);
|
||
start..self.next_node_id
|
||
}
|
||
|
||
pub fn lint_buffer(&mut self) -> &mut LintBuffer {
|
||
&mut self.lint_buffer
|
||
}
|
||
|
||
pub fn arenas() -> ResolverArenas<'ra> {
|
||
Default::default()
|
||
}
|
||
|
||
fn feed_visibility(&mut self, feed: Feed<'tcx, LocalDefId>, vis: ty::Visibility) {
|
||
let feed = feed.upgrade(self.tcx);
|
||
feed.visibility(vis.to_def_id());
|
||
self.visibilities_for_hashing.push((feed.def_id(), vis));
|
||
}
|
||
|
||
pub fn into_outputs(self) -> ResolverOutputs {
|
||
let proc_macros = self.proc_macros.iter().map(|id| self.local_def_id(*id)).collect();
|
||
let expn_that_defined = self.expn_that_defined;
|
||
let extern_crate_map = self.extern_crate_map;
|
||
let maybe_unused_trait_imports = self.maybe_unused_trait_imports;
|
||
let glob_map = self.glob_map;
|
||
let main_def = self.main_def;
|
||
let confused_type_with_std_module = self.confused_type_with_std_module;
|
||
let effective_visibilities = self.effective_visibilities;
|
||
|
||
let stripped_cfg_items = Steal::new(
|
||
self.stripped_cfg_items
|
||
.into_iter()
|
||
.filter_map(|item| {
|
||
let parent_module =
|
||
self.node_id_to_def_id.get(&item.parent_module)?.key().to_def_id();
|
||
Some(StrippedCfgItem { parent_module, name: item.name, cfg: item.cfg })
|
||
})
|
||
.collect(),
|
||
);
|
||
|
||
let global_ctxt = ResolverGlobalCtxt {
|
||
expn_that_defined,
|
||
visibilities_for_hashing: self.visibilities_for_hashing,
|
||
effective_visibilities,
|
||
extern_crate_map,
|
||
module_children: self.module_children,
|
||
glob_map,
|
||
maybe_unused_trait_imports,
|
||
main_def,
|
||
trait_impls: self.trait_impls,
|
||
proc_macros,
|
||
confused_type_with_std_module,
|
||
doc_link_resolutions: self.doc_link_resolutions,
|
||
doc_link_traits_in_scope: self.doc_link_traits_in_scope,
|
||
all_macro_rules: self.all_macro_rules,
|
||
stripped_cfg_items,
|
||
};
|
||
let ast_lowering = ty::ResolverAstLowering {
|
||
legacy_const_generic_args: self.legacy_const_generic_args,
|
||
partial_res_map: self.partial_res_map,
|
||
import_res_map: self.import_res_map,
|
||
label_res_map: self.label_res_map,
|
||
lifetimes_res_map: self.lifetimes_res_map,
|
||
extra_lifetime_params_map: self.extra_lifetime_params_map,
|
||
next_node_id: self.next_node_id,
|
||
node_id_to_def_id: self
|
||
.node_id_to_def_id
|
||
.into_items()
|
||
.map(|(k, f)| (k, f.key()))
|
||
.collect(),
|
||
trait_map: self.trait_map,
|
||
lifetime_elision_allowed: self.lifetime_elision_allowed,
|
||
lint_buffer: Steal::new(self.lint_buffer),
|
||
delegation_fn_sigs: self.delegation_fn_sigs,
|
||
};
|
||
ResolverOutputs { global_ctxt, ast_lowering }
|
||
}
|
||
|
||
fn create_stable_hashing_context(&self) -> StableHashingContext<'_> {
|
||
StableHashingContext::new(self.tcx.sess, self.tcx.untracked())
|
||
}
|
||
|
||
fn crate_loader<T>(&mut self, f: impl FnOnce(&mut CrateLoader<'_, '_>) -> T) -> T {
|
||
f(&mut CrateLoader::new(
|
||
self.tcx,
|
||
&mut CStore::from_tcx_mut(self.tcx),
|
||
&mut self.used_extern_options,
|
||
))
|
||
}
|
||
|
||
fn cstore(&self) -> FreezeReadGuard<'_, CStore> {
|
||
CStore::from_tcx(self.tcx)
|
||
}
|
||
|
||
fn dummy_ext(&self, macro_kind: MacroKind) -> Lrc<SyntaxExtension> {
|
||
match macro_kind {
|
||
MacroKind::Bang => Lrc::clone(&self.dummy_ext_bang),
|
||
MacroKind::Derive => Lrc::clone(&self.dummy_ext_derive),
|
||
MacroKind::Attr => Lrc::clone(&self.non_macro_attr.ext),
|
||
}
|
||
}
|
||
|
||
/// Runs the function on each namespace.
|
||
fn per_ns<F: FnMut(&mut Self, Namespace)>(&mut self, mut f: F) {
|
||
f(self, TypeNS);
|
||
f(self, ValueNS);
|
||
f(self, MacroNS);
|
||
}
|
||
|
||
fn is_builtin_macro(&mut self, res: Res) -> bool {
|
||
self.get_macro(res).is_some_and(|macro_data| macro_data.ext.builtin_name.is_some())
|
||
}
|
||
|
||
fn macro_def(&self, mut ctxt: SyntaxContext) -> DefId {
|
||
loop {
|
||
match ctxt.outer_expn_data().macro_def_id {
|
||
Some(def_id) => return def_id,
|
||
None => ctxt.remove_mark(),
|
||
};
|
||
}
|
||
}
|
||
|
||
/// Entry point to crate resolution.
|
||
pub fn resolve_crate(&mut self, krate: &Crate) {
|
||
self.tcx.sess.time("resolve_crate", || {
|
||
self.tcx.sess.time("finalize_imports", || self.finalize_imports());
|
||
let exported_ambiguities = self.tcx.sess.time("compute_effective_visibilities", || {
|
||
EffectiveVisibilitiesVisitor::compute_effective_visibilities(self, krate)
|
||
});
|
||
self.tcx.sess.time("check_hidden_glob_reexports", || {
|
||
self.check_hidden_glob_reexports(exported_ambiguities)
|
||
});
|
||
self.tcx
|
||
.sess
|
||
.time("finalize_macro_resolutions", || self.finalize_macro_resolutions(krate));
|
||
self.tcx.sess.time("late_resolve_crate", || self.late_resolve_crate(krate));
|
||
self.tcx.sess.time("resolve_main", || self.resolve_main());
|
||
self.tcx.sess.time("resolve_check_unused", || self.check_unused(krate));
|
||
self.tcx.sess.time("resolve_report_errors", || self.report_errors(krate));
|
||
self.tcx
|
||
.sess
|
||
.time("resolve_postprocess", || self.crate_loader(|c| c.postprocess(krate)));
|
||
});
|
||
|
||
// Make sure we don't mutate the cstore from here on.
|
||
self.tcx.untracked().cstore.freeze();
|
||
}
|
||
|
||
fn traits_in_scope(
|
||
&mut self,
|
||
current_trait: Option<Module<'ra>>,
|
||
parent_scope: &ParentScope<'ra>,
|
||
ctxt: SyntaxContext,
|
||
assoc_item: Option<(Symbol, Namespace)>,
|
||
) -> Vec<TraitCandidate> {
|
||
let mut found_traits = Vec::new();
|
||
|
||
if let Some(module) = current_trait {
|
||
if self.trait_may_have_item(Some(module), assoc_item) {
|
||
let def_id = module.def_id();
|
||
found_traits.push(TraitCandidate { def_id, import_ids: smallvec![] });
|
||
}
|
||
}
|
||
|
||
self.visit_scopes(ScopeSet::All(TypeNS), parent_scope, ctxt, |this, scope, _, _| {
|
||
match scope {
|
||
Scope::Module(module, _) => {
|
||
this.traits_in_module(module, assoc_item, &mut found_traits);
|
||
}
|
||
Scope::StdLibPrelude => {
|
||
if let Some(module) = this.prelude {
|
||
this.traits_in_module(module, assoc_item, &mut found_traits);
|
||
}
|
||
}
|
||
Scope::ExternPrelude | Scope::ToolPrelude | Scope::BuiltinTypes => {}
|
||
_ => unreachable!(),
|
||
}
|
||
None::<()>
|
||
});
|
||
|
||
found_traits
|
||
}
|
||
|
||
fn traits_in_module(
|
||
&mut self,
|
||
module: Module<'ra>,
|
||
assoc_item: Option<(Symbol, Namespace)>,
|
||
found_traits: &mut Vec<TraitCandidate>,
|
||
) {
|
||
module.ensure_traits(self);
|
||
let traits = module.traits.borrow();
|
||
for (trait_name, trait_binding) in traits.as_ref().unwrap().iter() {
|
||
if self.trait_may_have_item(trait_binding.module(), assoc_item) {
|
||
let def_id = trait_binding.res().def_id();
|
||
let import_ids = self.find_transitive_imports(&trait_binding.kind, *trait_name);
|
||
found_traits.push(TraitCandidate { def_id, import_ids });
|
||
}
|
||
}
|
||
}
|
||
|
||
// List of traits in scope is pruned on best effort basis. We reject traits not having an
|
||
// associated item with the given name and namespace (if specified). This is a conservative
|
||
// optimization, proper hygienic type-based resolution of associated items is done in typeck.
|
||
// We don't reject trait aliases (`trait_module == None`) because we don't have access to their
|
||
// associated items.
|
||
fn trait_may_have_item(
|
||
&mut self,
|
||
trait_module: Option<Module<'ra>>,
|
||
assoc_item: Option<(Symbol, Namespace)>,
|
||
) -> bool {
|
||
match (trait_module, assoc_item) {
|
||
(Some(trait_module), Some((name, ns))) => {
|
||
self.resolutions(trait_module).borrow().iter().any(|resolution| {
|
||
let (&BindingKey { ident: assoc_ident, ns: assoc_ns, .. }, _) = resolution;
|
||
assoc_ns == ns && assoc_ident.name == name
|
||
})
|
||
}
|
||
_ => true,
|
||
}
|
||
}
|
||
|
||
fn find_transitive_imports(
|
||
&mut self,
|
||
mut kind: &NameBindingKind<'_>,
|
||
trait_name: Ident,
|
||
) -> SmallVec<[LocalDefId; 1]> {
|
||
let mut import_ids = smallvec![];
|
||
while let NameBindingKind::Import { import, binding, .. } = kind {
|
||
if let Some(node_id) = import.id() {
|
||
let def_id = self.local_def_id(node_id);
|
||
self.maybe_unused_trait_imports.insert(def_id);
|
||
import_ids.push(def_id);
|
||
}
|
||
self.add_to_glob_map(*import, trait_name);
|
||
kind = &binding.kind;
|
||
}
|
||
import_ids
|
||
}
|
||
|
||
fn new_disambiguated_key(&mut self, ident: Ident, ns: Namespace) -> BindingKey {
|
||
let ident = ident.normalize_to_macros_2_0();
|
||
let disambiguator = if ident.name == kw::Underscore {
|
||
self.underscore_disambiguator += 1;
|
||
self.underscore_disambiguator
|
||
} else if ident.name == kw::Empty {
|
||
self.empty_disambiguator += 1;
|
||
self.empty_disambiguator
|
||
} else {
|
||
0
|
||
};
|
||
BindingKey { ident, ns, disambiguator }
|
||
}
|
||
|
||
fn resolutions(&mut self, module: Module<'ra>) -> &'ra Resolutions<'ra> {
|
||
if module.populate_on_access.get() {
|
||
module.populate_on_access.set(false);
|
||
self.build_reduced_graph_external(module);
|
||
}
|
||
&module.0.0.lazy_resolutions
|
||
}
|
||
|
||
fn resolution(
|
||
&mut self,
|
||
module: Module<'ra>,
|
||
key: BindingKey,
|
||
) -> &'ra RefCell<NameResolution<'ra>> {
|
||
*self
|
||
.resolutions(module)
|
||
.borrow_mut()
|
||
.entry(key)
|
||
.or_insert_with(|| self.arenas.alloc_name_resolution())
|
||
}
|
||
|
||
/// Test if AmbiguityError ambi is any identical to any one inside ambiguity_errors
|
||
fn matches_previous_ambiguity_error(&self, ambi: &AmbiguityError<'_>) -> bool {
|
||
for ambiguity_error in &self.ambiguity_errors {
|
||
// if the span location and ident as well as its span are the same
|
||
if ambiguity_error.kind == ambi.kind
|
||
&& ambiguity_error.ident == ambi.ident
|
||
&& ambiguity_error.ident.span == ambi.ident.span
|
||
&& ambiguity_error.b1.span == ambi.b1.span
|
||
&& ambiguity_error.b2.span == ambi.b2.span
|
||
&& ambiguity_error.misc1 == ambi.misc1
|
||
&& ambiguity_error.misc2 == ambi.misc2
|
||
{
|
||
return true;
|
||
}
|
||
}
|
||
false
|
||
}
|
||
|
||
fn record_use(&mut self, ident: Ident, used_binding: NameBinding<'ra>, used: Used) {
|
||
self.record_use_inner(ident, used_binding, used, used_binding.warn_ambiguity);
|
||
}
|
||
|
||
fn record_use_inner(
|
||
&mut self,
|
||
ident: Ident,
|
||
used_binding: NameBinding<'ra>,
|
||
used: Used,
|
||
warn_ambiguity: bool,
|
||
) {
|
||
if let Some((b2, kind)) = used_binding.ambiguity {
|
||
let ambiguity_error = AmbiguityError {
|
||
kind,
|
||
ident,
|
||
b1: used_binding,
|
||
b2,
|
||
misc1: AmbiguityErrorMisc::None,
|
||
misc2: AmbiguityErrorMisc::None,
|
||
warning: warn_ambiguity,
|
||
};
|
||
if !self.matches_previous_ambiguity_error(&ambiguity_error) {
|
||
// avoid duplicated span information to be emit out
|
||
self.ambiguity_errors.push(ambiguity_error);
|
||
}
|
||
}
|
||
if let NameBindingKind::Import { import, binding } = used_binding.kind {
|
||
if let ImportKind::MacroUse { warn_private: true } = import.kind {
|
||
self.lint_buffer().buffer_lint(
|
||
PRIVATE_MACRO_USE,
|
||
import.root_id,
|
||
ident.span,
|
||
BuiltinLintDiag::MacroIsPrivate(ident),
|
||
);
|
||
}
|
||
// Avoid marking `extern crate` items that refer to a name from extern prelude,
|
||
// but not introduce it, as used if they are accessed from lexical scope.
|
||
if used == Used::Scope {
|
||
if let Some(entry) = self.extern_prelude.get(&ident.normalize_to_macros_2_0()) {
|
||
if !entry.introduced_by_item && entry.binding == Some(used_binding) {
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
let old_used = self.import_use_map.entry(import).or_insert(used);
|
||
if *old_used < used {
|
||
*old_used = used;
|
||
}
|
||
if let Some(id) = import.id() {
|
||
self.used_imports.insert(id);
|
||
}
|
||
self.add_to_glob_map(import, ident);
|
||
self.record_use_inner(
|
||
ident,
|
||
binding,
|
||
Used::Other,
|
||
warn_ambiguity || binding.warn_ambiguity,
|
||
);
|
||
}
|
||
}
|
||
|
||
#[inline]
|
||
fn add_to_glob_map(&mut self, import: Import<'_>, ident: Ident) {
|
||
if let ImportKind::Glob { id, .. } = import.kind {
|
||
let def_id = self.local_def_id(id);
|
||
self.glob_map.entry(def_id).or_default().insert(ident.name);
|
||
}
|
||
}
|
||
|
||
fn resolve_crate_root(&mut self, ident: Ident) -> Module<'ra> {
|
||
debug!("resolve_crate_root({:?})", ident);
|
||
let mut ctxt = ident.span.ctxt();
|
||
let mark = if ident.name == kw::DollarCrate {
|
||
// When resolving `$crate` from a `macro_rules!` invoked in a `macro`,
|
||
// we don't want to pretend that the `macro_rules!` definition is in the `macro`
|
||
// as described in `SyntaxContext::apply_mark`, so we ignore prepended opaque marks.
|
||
// FIXME: This is only a guess and it doesn't work correctly for `macro_rules!`
|
||
// definitions actually produced by `macro` and `macro` definitions produced by
|
||
// `macro_rules!`, but at least such configurations are not stable yet.
|
||
ctxt = ctxt.normalize_to_macro_rules();
|
||
debug!(
|
||
"resolve_crate_root: marks={:?}",
|
||
ctxt.marks().into_iter().map(|(i, t)| (i.expn_data(), t)).collect::<Vec<_>>()
|
||
);
|
||
let mut iter = ctxt.marks().into_iter().rev().peekable();
|
||
let mut result = None;
|
||
// Find the last opaque mark from the end if it exists.
|
||
while let Some(&(mark, transparency)) = iter.peek() {
|
||
if transparency == Transparency::Opaque {
|
||
result = Some(mark);
|
||
iter.next();
|
||
} else {
|
||
break;
|
||
}
|
||
}
|
||
debug!(
|
||
"resolve_crate_root: found opaque mark {:?} {:?}",
|
||
result,
|
||
result.map(|r| r.expn_data())
|
||
);
|
||
// Then find the last semi-transparent mark from the end if it exists.
|
||
for (mark, transparency) in iter {
|
||
if transparency == Transparency::SemiTransparent {
|
||
result = Some(mark);
|
||
} else {
|
||
break;
|
||
}
|
||
}
|
||
debug!(
|
||
"resolve_crate_root: found semi-transparent mark {:?} {:?}",
|
||
result,
|
||
result.map(|r| r.expn_data())
|
||
);
|
||
result
|
||
} else {
|
||
debug!("resolve_crate_root: not DollarCrate");
|
||
ctxt = ctxt.normalize_to_macros_2_0();
|
||
ctxt.adjust(ExpnId::root())
|
||
};
|
||
let module = match mark {
|
||
Some(def) => self.expn_def_scope(def),
|
||
None => {
|
||
debug!(
|
||
"resolve_crate_root({:?}): found no mark (ident.span = {:?})",
|
||
ident, ident.span
|
||
);
|
||
return self.graph_root;
|
||
}
|
||
};
|
||
let module = self.expect_module(
|
||
module.opt_def_id().map_or(LOCAL_CRATE, |def_id| def_id.krate).as_def_id(),
|
||
);
|
||
debug!(
|
||
"resolve_crate_root({:?}): got module {:?} ({:?}) (ident.span = {:?})",
|
||
ident,
|
||
module,
|
||
module.kind.name(),
|
||
ident.span
|
||
);
|
||
module
|
||
}
|
||
|
||
fn resolve_self(&mut self, ctxt: &mut SyntaxContext, module: Module<'ra>) -> Module<'ra> {
|
||
let mut module = self.expect_module(module.nearest_parent_mod());
|
||
while module.span.ctxt().normalize_to_macros_2_0() != *ctxt {
|
||
let parent = module.parent.unwrap_or_else(|| self.expn_def_scope(ctxt.remove_mark()));
|
||
module = self.expect_module(parent.nearest_parent_mod());
|
||
}
|
||
module
|
||
}
|
||
|
||
fn record_partial_res(&mut self, node_id: NodeId, resolution: PartialRes) {
|
||
debug!("(recording res) recording {:?} for {}", resolution, node_id);
|
||
if let Some(prev_res) = self.partial_res_map.insert(node_id, resolution) {
|
||
panic!("path resolved multiple times ({prev_res:?} before, {resolution:?} now)");
|
||
}
|
||
}
|
||
|
||
fn record_pat_span(&mut self, node: NodeId, span: Span) {
|
||
debug!("(recording pat) recording {:?} for {:?}", node, span);
|
||
self.pat_span_map.insert(node, span);
|
||
}
|
||
|
||
fn is_accessible_from(
|
||
&self,
|
||
vis: ty::Visibility<impl Into<DefId>>,
|
||
module: Module<'ra>,
|
||
) -> bool {
|
||
vis.is_accessible_from(module.nearest_parent_mod(), self.tcx)
|
||
}
|
||
|
||
fn set_binding_parent_module(&mut self, binding: NameBinding<'ra>, module: Module<'ra>) {
|
||
if let Some(old_module) = self.binding_parent_modules.insert(binding, module) {
|
||
if module != old_module {
|
||
span_bug!(binding.span, "parent module is reset for binding");
|
||
}
|
||
}
|
||
}
|
||
|
||
fn disambiguate_macro_rules_vs_modularized(
|
||
&self,
|
||
macro_rules: NameBinding<'ra>,
|
||
modularized: NameBinding<'ra>,
|
||
) -> bool {
|
||
// Some non-controversial subset of ambiguities "modularized macro name" vs "macro_rules"
|
||
// is disambiguated to mitigate regressions from macro modularization.
|
||
// Scoping for `macro_rules` behaves like scoping for `let` at module level, in general.
|
||
match (
|
||
self.binding_parent_modules.get(¯o_rules),
|
||
self.binding_parent_modules.get(&modularized),
|
||
) {
|
||
(Some(macro_rules), Some(modularized)) => {
|
||
macro_rules.nearest_parent_mod() == modularized.nearest_parent_mod()
|
||
&& modularized.is_ancestor_of(*macro_rules)
|
||
}
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
fn extern_prelude_get(&mut self, ident: Ident, finalize: bool) -> Option<NameBinding<'ra>> {
|
||
if ident.is_path_segment_keyword() {
|
||
// Make sure `self`, `super` etc produce an error when passed to here.
|
||
return None;
|
||
}
|
||
|
||
let norm_ident = ident.normalize_to_macros_2_0();
|
||
let binding = self.extern_prelude.get(&norm_ident).cloned().and_then(|entry| {
|
||
Some(if let Some(binding) = entry.binding {
|
||
if finalize {
|
||
if !entry.is_import() {
|
||
self.crate_loader(|c| c.process_path_extern(ident.name, ident.span));
|
||
} else if entry.introduced_by_item {
|
||
self.record_use(ident, binding, Used::Other);
|
||
}
|
||
}
|
||
binding
|
||
} else {
|
||
let crate_id = if finalize {
|
||
let Some(crate_id) =
|
||
self.crate_loader(|c| c.process_path_extern(ident.name, ident.span))
|
||
else {
|
||
return Some(self.dummy_binding);
|
||
};
|
||
crate_id
|
||
} else {
|
||
self.crate_loader(|c| c.maybe_process_path_extern(ident.name))?
|
||
};
|
||
let crate_root = self.expect_module(crate_id.as_def_id());
|
||
let vis = ty::Visibility::<DefId>::Public;
|
||
(crate_root, vis, DUMMY_SP, LocalExpnId::ROOT).to_name_binding(self.arenas)
|
||
})
|
||
});
|
||
|
||
if let Some(entry) = self.extern_prelude.get_mut(&norm_ident) {
|
||
entry.binding = binding;
|
||
}
|
||
|
||
binding
|
||
}
|
||
|
||
/// Rustdoc uses this to resolve doc link paths in a recoverable way. `PathResult<'a>`
|
||
/// isn't something that can be returned because it can't be made to live that long,
|
||
/// and also it's a private type. Fortunately rustdoc doesn't need to know the error,
|
||
/// just that an error occurred.
|
||
fn resolve_rustdoc_path(
|
||
&mut self,
|
||
path_str: &str,
|
||
ns: Namespace,
|
||
parent_scope: ParentScope<'ra>,
|
||
) -> Option<Res> {
|
||
let mut segments =
|
||
Vec::from_iter(path_str.split("::").map(Ident::from_str).map(Segment::from_ident));
|
||
if let Some(segment) = segments.first_mut() {
|
||
if segment.ident.name == kw::Empty {
|
||
segment.ident.name = kw::PathRoot;
|
||
}
|
||
}
|
||
|
||
match self.maybe_resolve_path(&segments, Some(ns), &parent_scope, None) {
|
||
PathResult::Module(ModuleOrUniformRoot::Module(module)) => Some(module.res().unwrap()),
|
||
PathResult::NonModule(path_res) => {
|
||
path_res.full_res().filter(|res| !matches!(res, Res::Def(DefKind::Ctor(..), _)))
|
||
}
|
||
PathResult::Module(ModuleOrUniformRoot::ExternPrelude) | PathResult::Failed { .. } => {
|
||
None
|
||
}
|
||
PathResult::Module(..) | PathResult::Indeterminate => unreachable!(),
|
||
}
|
||
}
|
||
|
||
/// Retrieves definition span of the given `DefId`.
|
||
fn def_span(&self, def_id: DefId) -> Span {
|
||
match def_id.as_local() {
|
||
Some(def_id) => self.tcx.source_span(def_id),
|
||
// Query `def_span` is not used because hashing its result span is expensive.
|
||
None => self.cstore().def_span_untracked(def_id, self.tcx.sess),
|
||
}
|
||
}
|
||
|
||
fn field_idents(&self, def_id: DefId) -> Option<Vec<Ident>> {
|
||
match def_id.as_local() {
|
||
Some(def_id) => self.field_names.get(&def_id).cloned(),
|
||
None => Some(
|
||
self.tcx
|
||
.associated_item_def_ids(def_id)
|
||
.iter()
|
||
.map(|&def_id| {
|
||
Ident::new(self.tcx.item_name(def_id), self.tcx.def_span(def_id))
|
||
})
|
||
.collect(),
|
||
),
|
||
}
|
||
}
|
||
|
||
/// Checks if an expression refers to a function marked with
|
||
/// `#[rustc_legacy_const_generics]` and returns the argument index list
|
||
/// from the attribute.
|
||
fn legacy_const_generic_args(&mut self, expr: &Expr) -> Option<Vec<usize>> {
|
||
if let ExprKind::Path(None, path) = &expr.kind {
|
||
// Don't perform legacy const generics rewriting if the path already
|
||
// has generic arguments.
|
||
if path.segments.last().unwrap().args.is_some() {
|
||
return None;
|
||
}
|
||
|
||
let res = self.partial_res_map.get(&expr.id)?.full_res()?;
|
||
if let Res::Def(def::DefKind::Fn, def_id) = res {
|
||
// We only support cross-crate argument rewriting. Uses
|
||
// within the same crate should be updated to use the new
|
||
// const generics style.
|
||
if def_id.is_local() {
|
||
return None;
|
||
}
|
||
|
||
if let Some(v) = self.legacy_const_generic_args.get(&def_id) {
|
||
return v.clone();
|
||
}
|
||
|
||
let attr = self.tcx.get_attr(def_id, sym::rustc_legacy_const_generics)?;
|
||
let mut ret = Vec::new();
|
||
for meta in attr.meta_item_list()? {
|
||
match meta.lit()?.kind {
|
||
LitKind::Int(a, _) => ret.push(a.get() as usize),
|
||
_ => panic!("invalid arg index"),
|
||
}
|
||
}
|
||
// Cache the lookup to avoid parsing attributes for an item multiple times.
|
||
self.legacy_const_generic_args.insert(def_id, Some(ret.clone()));
|
||
return Some(ret);
|
||
}
|
||
}
|
||
None
|
||
}
|
||
|
||
fn resolve_main(&mut self) {
|
||
let module = self.graph_root;
|
||
let ident = Ident::with_dummy_span(sym::main);
|
||
let parent_scope = &ParentScope::module(module, self);
|
||
|
||
let Ok(name_binding) = self.maybe_resolve_ident_in_module(
|
||
ModuleOrUniformRoot::Module(module),
|
||
ident,
|
||
ValueNS,
|
||
parent_scope,
|
||
None,
|
||
) else {
|
||
return;
|
||
};
|
||
|
||
let res = name_binding.res();
|
||
let is_import = name_binding.is_import();
|
||
let span = name_binding.span;
|
||
if let Res::Def(DefKind::Fn, _) = res {
|
||
self.record_use(ident, name_binding, Used::Other);
|
||
}
|
||
self.main_def = Some(MainDefinition { res, is_import, span });
|
||
}
|
||
}
|
||
|
||
fn names_to_string(names: &[Symbol]) -> String {
|
||
let mut result = String::new();
|
||
for (i, name) in names.iter().filter(|name| **name != kw::PathRoot).enumerate() {
|
||
if i > 0 {
|
||
result.push_str("::");
|
||
}
|
||
if Ident::with_dummy_span(*name).is_raw_guess() {
|
||
result.push_str("r#");
|
||
}
|
||
result.push_str(name.as_str());
|
||
}
|
||
result
|
||
}
|
||
|
||
fn path_names_to_string(path: &Path) -> String {
|
||
names_to_string(&path.segments.iter().map(|seg| seg.ident.name).collect::<Vec<_>>())
|
||
}
|
||
|
||
/// A somewhat inefficient routine to obtain the name of a module.
|
||
fn module_to_string(module: Module<'_>) -> Option<String> {
|
||
let mut names = Vec::new();
|
||
|
||
fn collect_mod(names: &mut Vec<Symbol>, module: Module<'_>) {
|
||
if let ModuleKind::Def(.., name) = module.kind {
|
||
if let Some(parent) = module.parent {
|
||
names.push(name);
|
||
collect_mod(names, parent);
|
||
}
|
||
} else {
|
||
names.push(Symbol::intern("<opaque>"));
|
||
collect_mod(names, module.parent.unwrap());
|
||
}
|
||
}
|
||
collect_mod(&mut names, module);
|
||
|
||
if names.is_empty() {
|
||
return None;
|
||
}
|
||
names.reverse();
|
||
Some(names_to_string(&names))
|
||
}
|
||
|
||
#[derive(Copy, Clone, Debug)]
|
||
struct Finalize {
|
||
/// Node ID for linting.
|
||
node_id: NodeId,
|
||
/// Span of the whole path or some its characteristic fragment.
|
||
/// E.g. span of `b` in `foo::{a, b, c}`, or full span for regular paths.
|
||
path_span: Span,
|
||
/// Span of the path start, suitable for prepending something to it.
|
||
/// E.g. span of `foo` in `foo::{a, b, c}`, or full span for regular paths.
|
||
root_span: Span,
|
||
/// Whether to report privacy errors or silently return "no resolution" for them,
|
||
/// similarly to speculative resolution.
|
||
report_private: bool,
|
||
/// Tracks whether an item is used in scope or used relatively to a module.
|
||
used: Used,
|
||
}
|
||
|
||
impl Finalize {
|
||
fn new(node_id: NodeId, path_span: Span) -> Finalize {
|
||
Finalize::with_root_span(node_id, path_span, path_span)
|
||
}
|
||
|
||
fn with_root_span(node_id: NodeId, path_span: Span, root_span: Span) -> Finalize {
|
||
Finalize { node_id, path_span, root_span, report_private: true, used: Used::Other }
|
||
}
|
||
}
|
||
|
||
pub fn provide(providers: &mut Providers) {
|
||
providers.registered_tools = macros::registered_tools;
|
||
}
|