2082 lines
76 KiB
Rust
2082 lines
76 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_typeck`.
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#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
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#![feature(box_patterns)]
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#![feature(drain_filter)]
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#![feature(if_let_guard)]
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#![cfg_attr(bootstrap, feature(let_chains))]
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#![feature(iter_intersperse)]
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#![feature(let_else)]
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#![feature(never_type)]
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#![recursion_limit = "256"]
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#![allow(rustdoc::private_intra_doc_links)]
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#![allow(rustc::potential_query_instability)]
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#[macro_use]
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extern crate tracing;
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pub use rustc_hir::def::{Namespace, PerNS};
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use rustc_arena::{DroplessArena, TypedArena};
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use rustc_ast::node_id::NodeMap;
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use rustc_ast::{self as ast, NodeId, CRATE_NODE_ID};
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use rustc_ast::{AngleBracketedArg, Crate, Expr, ExprKind, GenericArg, GenericArgs, LitKind, Path};
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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::sync::Lrc;
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use rustc_errors::{Applicability, DiagnosticBuilder, ErrorGuaranteed};
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use rustc_expand::base::{DeriveResolutions, SyntaxExtension, SyntaxExtensionKind};
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use rustc_hir::def::Namespace::*;
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use rustc_hir::def::{self, CtorOf, DefKind, LifetimeRes, PartialRes};
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use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LocalDefId};
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use rustc_hir::def_id::{CRATE_DEF_ID, LOCAL_CRATE};
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use rustc_hir::definitions::{DefPathData, Definitions};
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use rustc_hir::TraitCandidate;
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use rustc_index::vec::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::AccessLevels;
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use rustc_middle::span_bug;
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use rustc_middle::ty::query::Providers;
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use rustc_middle::ty::{self, DefIdTree, MainDefinition, RegisteredTools, ResolverOutputs};
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use rustc_query_system::ich::StableHashingContext;
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use rustc_session::cstore::{CrateStore, CrateStoreDyn, MetadataLoaderDyn};
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use rustc_session::lint::LintBuffer;
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use rustc_session::Session;
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use rustc_span::hygiene::{ExpnId, LocalExpnId, MacroKind, SyntaxContext, Transparency};
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use rustc_span::source_map::Spanned;
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use rustc_span::symbol::{kw, sym, Ident, Symbol};
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use rustc_span::{Span, DUMMY_SP};
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use smallvec::{smallvec, SmallVec};
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use std::cell::{Cell, RefCell};
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use std::collections::BTreeSet;
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use std::{cmp, fmt, ptr};
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use tracing::debug;
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use diagnostics::{ImportSuggestion, LabelSuggestion, Suggestion};
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use imports::{Import, ImportKind, ImportResolver, NameResolution};
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use late::{HasGenericParams, PathSource, PatternSource};
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use macros::{MacroRulesBinding, MacroRulesScope, MacroRulesScopeRef};
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use crate::access_levels::AccessLevelsVisitor;
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type Res = def::Res<NodeId>;
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mod access_levels;
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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 ident;
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mod imports;
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mod late;
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mod macros;
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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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pub 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)]
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enum Scope<'a> {
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DeriveHelpers(LocalExpnId),
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DeriveHelpersCompat,
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MacroRules(MacroRulesScopeRef<'a>),
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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<'a>, Option<NodeId>),
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RegisteredAttrs,
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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)]
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enum ScopeSet<'a> {
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/// All scopes with the given namespace.
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All(Namespace, /*is_import*/ bool),
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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<'a>, 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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pub struct ParentScope<'a> {
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pub module: Module<'a>,
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expansion: LocalExpnId,
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pub macro_rules: MacroRulesScopeRef<'a>,
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derives: &'a [ast::Path],
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}
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impl<'a> ParentScope<'a> {
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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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pub fn module(module: Module<'a>, resolver: &Resolver<'a>) -> ParentScope<'a> {
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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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enum ImplTraitContext {
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Existential,
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Universal(LocalDefId),
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}
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#[derive(Eq)]
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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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impl PartialOrd for BindingError {
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fn partial_cmp(&self, other: &BindingError) -> Option<cmp::Ordering> {
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Some(self.cmp(other))
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}
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}
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impl PartialEq for BindingError {
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fn eq(&self, other: &BindingError) -> bool {
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self.name == other.name
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}
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}
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impl Ord for BindingError {
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fn cmp(&self, other: &BindingError) -> cmp::Ordering {
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self.name.cmp(&other.name)
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}
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}
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enum ResolutionError<'a> {
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/// Error E0401: can't use type or const parameters from outer function.
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GenericParamsFromOuterFunction(Res, HasGenericParams),
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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<'a>),
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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 { label: String, suggestion: Option<Suggestion> },
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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,
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/* suggestion */ &'static str,
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/* current */ &'static str,
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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(Symbol),
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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, is_type: bool },
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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: rustc_errors::DiagnosticId,
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},
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/// Inline asm `sym` operand must refer to a `fn` or `static`.
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InvalidAsmSym,
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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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/// A minimal representation of a path segment. We use this in resolve because we synthesize 'path
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/// segments' which don't have the rest of an AST or HIR `PathSegment`.
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#[derive(Clone, Copy, Debug)]
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pub struct Segment {
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ident: Ident,
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id: Option<NodeId>,
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/// Signals whether this `PathSegment` has generic arguments. Used to avoid providing
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/// nonsensical suggestions.
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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()
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}
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fn from_ident(ident: Ident) -> Segment {
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Segment {
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ident,
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id: None,
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has_generic_args: false,
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has_lifetime_args: false,
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args_span: DUMMY_SP,
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}
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}
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fn from_ident_and_id(ident: Ident, id: NodeId) -> Segment {
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Segment {
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ident,
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id: Some(id),
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has_generic_args: false,
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has_lifetime_args: false,
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args_span: DUMMY_SP,
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}
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}
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fn names_to_string(segments: &[Segment]) -> String {
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names_to_string(&segments.iter().map(|seg| seg.ident.name).collect::<Vec<_>>())
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}
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}
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impl<'a> From<&'a ast::PathSegment> for Segment {
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fn from(seg: &'a ast::PathSegment) -> Segment {
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let has_generic_args = seg.args.is_some();
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let (args_span, has_lifetime_args) = if let Some(args) = seg.args.as_deref() {
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match args {
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GenericArgs::AngleBracketed(args) => {
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let found_lifetimes = args
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.args
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.iter()
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.any(|arg| matches!(arg, AngleBracketedArg::Arg(GenericArg::Lifetime(_))));
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(args.span, found_lifetimes)
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}
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GenericArgs::Parenthesized(args) => (args.span, true),
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}
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} else {
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(DUMMY_SP, false)
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};
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Segment {
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ident: seg.ident,
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id: Some(seg.id),
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has_generic_args,
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has_lifetime_args,
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args_span,
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}
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}
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}
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|
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/// An intermediate resolution result.
|
||
///
|
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/// This refers to the thing referred by a name. The difference between `Res` and `Item` is that
|
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/// items are visible in their whole block, while `Res`es only from the place they are defined
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/// forward.
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#[derive(Debug)]
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enum LexicalScopeBinding<'a> {
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Item(&'a NameBinding<'a>),
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Res(Res),
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}
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impl<'a> LexicalScopeBinding<'a> {
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fn res(self) -> Res {
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match self {
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LexicalScopeBinding::Item(binding) => binding.res(),
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LexicalScopeBinding::Res(res) => res,
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||
}
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}
|
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}
|
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|
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#[derive(Copy, Clone, Debug)]
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enum ModuleOrUniformRoot<'a> {
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/// Regular module.
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Module(Module<'a>),
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|
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/// Virtual module that denotes resolution in crate root with fallback to extern prelude.
|
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CrateRootAndExternPrelude,
|
||
|
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/// Virtual module that denotes resolution in extern prelude.
|
||
/// Used for paths starting with `::` on 2018 edition.
|
||
ExternPrelude,
|
||
|
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/// 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,
|
||
}
|
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|
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impl ModuleOrUniformRoot<'_> {
|
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fn same_def(lhs: Self, rhs: Self) -> bool {
|
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match (lhs, rhs) {
|
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(ModuleOrUniformRoot::Module(lhs), ModuleOrUniformRoot::Module(rhs)) => {
|
||
ptr::eq(lhs, rhs)
|
||
}
|
||
(
|
||
ModuleOrUniformRoot::CrateRootAndExternPrelude,
|
||
ModuleOrUniformRoot::CrateRootAndExternPrelude,
|
||
)
|
||
| (ModuleOrUniformRoot::ExternPrelude, ModuleOrUniformRoot::ExternPrelude)
|
||
| (ModuleOrUniformRoot::CurrentScope, ModuleOrUniformRoot::CurrentScope) => true,
|
||
_ => false,
|
||
}
|
||
}
|
||
}
|
||
|
||
#[derive(Clone, Debug)]
|
||
enum PathResult<'a> {
|
||
Module(ModuleOrUniformRoot<'a>),
|
||
NonModule(PartialRes),
|
||
Indeterminate,
|
||
Failed {
|
||
span: Span,
|
||
label: String,
|
||
suggestion: Option<Suggestion>,
|
||
is_error_from_last_segment: bool,
|
||
},
|
||
}
|
||
|
||
impl<'a> PathResult<'a> {
|
||
fn failed(
|
||
span: Span,
|
||
is_error_from_last_segment: bool,
|
||
finalize: bool,
|
||
label_and_suggestion: impl FnOnce() -> (String, Option<Suggestion>),
|
||
) -> PathResult<'a> {
|
||
let (label, suggestion) =
|
||
if finalize { label_and_suggestion() } else { (String::new(), None) };
|
||
PathResult::Failed { span, label, suggestion, is_error_from_last_segment }
|
||
}
|
||
}
|
||
|
||
#[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(NodeId),
|
||
/// 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.
|
||
pub 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,
|
||
}
|
||
|
||
type Resolutions<'a> = RefCell<FxIndexMap<BindingKey, &'a RefCell<NameResolution<'a>>>>;
|
||
|
||
/// 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.
|
||
pub struct ModuleData<'a> {
|
||
/// The direct parent module (it may not be a `mod`, however).
|
||
parent: Option<Module<'a>>,
|
||
/// 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<'a>,
|
||
/// 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<&'a Import<'a>>>,
|
||
globs: RefCell<Vec<&'a Import<'a>>>,
|
||
|
||
/// Used to memoize the traits in this module for faster searches through all traits in scope.
|
||
traits: RefCell<Option<Box<[(Ident, &'a NameBinding<'a>)]>>>,
|
||
|
||
/// Span of the module itself. Used for error reporting.
|
||
span: Span,
|
||
|
||
expansion: ExpnId,
|
||
}
|
||
|
||
type Module<'a> = &'a ModuleData<'a>;
|
||
|
||
impl<'a> ModuleData<'a> {
|
||
fn new(
|
||
parent: Option<Module<'a>>,
|
||
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,
|
||
}
|
||
}
|
||
|
||
fn for_each_child<R, F>(&'a self, resolver: &mut R, mut f: F)
|
||
where
|
||
R: AsMut<Resolver<'a>>,
|
||
F: FnMut(&mut R, Ident, Namespace, &'a NameBinding<'a>),
|
||
{
|
||
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<R>(&'a self, resolver: &mut R)
|
||
where
|
||
R: AsMut<Resolver<'a>>,
|
||
{
|
||
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.
|
||
pub 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(&'a self) -> Module<'a> {
|
||
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 !ptr::eq(self, other) {
|
||
if let Some(parent) = other.parent {
|
||
other = parent;
|
||
} else {
|
||
return false;
|
||
}
|
||
}
|
||
true
|
||
}
|
||
}
|
||
|
||
impl<'a> fmt::Debug for ModuleData<'a> {
|
||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
write!(f, "{:?}", self.res())
|
||
}
|
||
}
|
||
|
||
/// Records a possibly-private value, type, or module definition.
|
||
#[derive(Clone, Debug)]
|
||
pub struct NameBinding<'a> {
|
||
kind: NameBindingKind<'a>,
|
||
ambiguity: Option<(&'a NameBinding<'a>, AmbiguityKind)>,
|
||
expansion: LocalExpnId,
|
||
span: Span,
|
||
vis: ty::Visibility,
|
||
}
|
||
|
||
pub trait ToNameBinding<'a> {
|
||
fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a>;
|
||
}
|
||
|
||
impl<'a> ToNameBinding<'a> for &'a NameBinding<'a> {
|
||
fn to_name_binding(self, _: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> {
|
||
self
|
||
}
|
||
}
|
||
|
||
#[derive(Clone, Debug)]
|
||
enum NameBindingKind<'a> {
|
||
Res(Res, /* is_macro_export */ bool),
|
||
Module(Module<'a>),
|
||
Import { binding: &'a NameBinding<'a>, import: &'a Import<'a>, used: Cell<bool> },
|
||
}
|
||
|
||
impl<'a> NameBindingKind<'a> {
|
||
/// Is this a name binding of an import?
|
||
fn is_import(&self) -> bool {
|
||
matches!(*self, NameBindingKind::Import { .. })
|
||
}
|
||
}
|
||
|
||
struct PrivacyError<'a> {
|
||
ident: Ident,
|
||
binding: &'a NameBinding<'a>,
|
||
dedup_span: Span,
|
||
}
|
||
|
||
struct UseError<'a> {
|
||
err: DiagnosticBuilder<'a, ErrorGuaranteed>,
|
||
/// 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>,
|
||
}
|
||
|
||
#[derive(Clone, Copy, PartialEq, Debug)]
|
||
enum AmbiguityKind {
|
||
Import,
|
||
BuiltinAttr,
|
||
DeriveHelper,
|
||
MacroRulesVsModularized,
|
||
GlobVsOuter,
|
||
GlobVsGlob,
|
||
GlobVsExpanded,
|
||
MoreExpandedVsOuter,
|
||
}
|
||
|
||
impl AmbiguityKind {
|
||
fn descr(self) -> &'static str {
|
||
match self {
|
||
AmbiguityKind::Import => "multiple potential import sources",
|
||
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<'a> {
|
||
kind: AmbiguityKind,
|
||
ident: Ident,
|
||
b1: &'a NameBinding<'a>,
|
||
b2: &'a NameBinding<'a>,
|
||
misc1: AmbiguityErrorMisc,
|
||
misc2: AmbiguityErrorMisc,
|
||
}
|
||
|
||
impl<'a> NameBinding<'a> {
|
||
fn module(&self) -> Option<Module<'a>> {
|
||
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(&self) -> bool {
|
||
self.ambiguity.is_some()
|
||
|| match self.kind {
|
||
NameBindingKind::Import { binding, .. } => binding.is_ambiguity(),
|
||
_ => 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: &Import { kind: ImportKind::ExternCrate { .. }, .. },
|
||
..
|
||
} => true,
|
||
NameBindingKind::Module(&ModuleData {
|
||
kind: ModuleKind::Def(DefKind::Mod, def_id, _),
|
||
..
|
||
}) => def_id.is_crate_root(),
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
fn is_import(&self) -> bool {
|
||
matches!(self.kind, NameBindingKind::Import { .. })
|
||
}
|
||
|
||
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)
|
||
}
|
||
}
|
||
|
||
#[derive(Debug, Default, Clone)]
|
||
pub struct ExternPreludeEntry<'a> {
|
||
extern_crate_item: Option<&'a NameBinding<'a>>,
|
||
pub introduced_by_item: bool,
|
||
}
|
||
|
||
/// Used for better errors for E0773
|
||
enum BuiltinMacroState {
|
||
NotYetSeen(SyntaxExtensionKind),
|
||
AlreadySeen(Span),
|
||
}
|
||
|
||
struct DeriveData {
|
||
resolutions: DeriveResolutions,
|
||
helper_attrs: Vec<(usize, Ident)>,
|
||
has_derive_copy: bool,
|
||
}
|
||
|
||
#[derive(Clone)]
|
||
struct MacroData {
|
||
ext: Lrc<SyntaxExtension>,
|
||
macro_rules: bool,
|
||
}
|
||
|
||
/// The main resolver class.
|
||
///
|
||
/// This is the visitor that walks the whole crate.
|
||
pub struct Resolver<'a> {
|
||
session: &'a Session,
|
||
|
||
definitions: Definitions,
|
||
/// Item with a given `LocalDefId` was defined during macro expansion with ID `ExpnId`.
|
||
expn_that_defined: FxHashMap<LocalDefId, ExpnId>,
|
||
/// Reference span for definitions.
|
||
source_span: IndexVec<LocalDefId, Span>,
|
||
|
||
graph_root: Module<'a>,
|
||
|
||
prelude: Option<Module<'a>>,
|
||
extern_prelude: FxHashMap<Ident, ExternPreludeEntry<'a>>,
|
||
|
||
/// N.B., this is used only for better diagnostics, not name resolution itself.
|
||
has_self: FxHashSet<DefId>,
|
||
|
||
/// Names of fields of an item `DefId` accessible with dot syntax.
|
||
/// Used for hints during error reporting.
|
||
field_names: FxHashMap<DefId, Vec<Spanned<Symbol>>>,
|
||
|
||
/// All imports known to succeed or fail.
|
||
determined_imports: Vec<&'a Import<'a>>,
|
||
|
||
/// All non-determined imports.
|
||
indeterminate_imports: Vec<&'a Import<'a>>,
|
||
|
||
// 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>>>,
|
||
/// 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>,
|
||
reexport_map: FxHashMap<LocalDefId, 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<'a>>,
|
||
/// 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
|
||
/// language items.
|
||
empty_module: Module<'a>,
|
||
module_map: FxHashMap<DefId, Module<'a>>,
|
||
binding_parent_modules: FxHashMap<Interned<'a, NameBinding<'a>>, Module<'a>>,
|
||
underscore_disambiguator: u32,
|
||
|
||
/// Maps glob imports to the names of items actually imported.
|
||
glob_map: FxHashMap<LocalDefId, FxHashSet<Symbol>>,
|
||
/// Visibilities in "lowered" form, for all entities that have them.
|
||
visibilities: FxHashMap<LocalDefId, ty::Visibility>,
|
||
has_pub_restricted: bool,
|
||
used_imports: FxHashSet<NodeId>,
|
||
maybe_unused_trait_imports: FxIndexSet<LocalDefId>,
|
||
maybe_unused_extern_crates: Vec<(LocalDefId, Span)>,
|
||
|
||
/// Privacy errors are delayed until the end in order to deduplicate them.
|
||
privacy_errors: Vec<PrivacyError<'a>>,
|
||
/// Ambiguity errors are delayed for deduplication.
|
||
ambiguity_errors: Vec<AmbiguityError<'a>>,
|
||
/// `use` injections are delayed for better placement and deduplication.
|
||
use_injections: Vec<UseError<'a>>,
|
||
/// Crate-local macro expanded `macro_export` referred to by a module-relative path.
|
||
macro_expanded_macro_export_errors: BTreeSet<(Span, Span)>,
|
||
|
||
arenas: &'a ResolverArenas<'a>,
|
||
dummy_binding: &'a NameBinding<'a>,
|
||
|
||
crate_loader: CrateLoader<'a>,
|
||
macro_names: FxHashSet<Ident>,
|
||
builtin_macros: FxHashMap<Symbol, BuiltinMacroState>,
|
||
/// A small map keeping true kinds of built-in macros that appear to be fn-like on
|
||
/// the surface (`macro` items in libcore), but are actually attributes or derives.
|
||
builtin_macro_kinds: FxHashMap<LocalDefId, MacroKind>,
|
||
registered_attrs: FxHashSet<Ident>,
|
||
registered_tools: RegisteredTools,
|
||
macro_use_prelude: FxHashMap<Symbol, &'a NameBinding<'a>>,
|
||
macro_map: FxHashMap<DefId, MacroData>,
|
||
dummy_ext_bang: Lrc<SyntaxExtension>,
|
||
dummy_ext_derive: Lrc<SyntaxExtension>,
|
||
non_macro_attr: Lrc<SyntaxExtension>,
|
||
local_macro_def_scopes: FxHashMap<LocalDefId, Module<'a>>,
|
||
ast_transform_scopes: FxHashMap<LocalExpnId, Module<'a>>,
|
||
unused_macros: FxHashMap<LocalDefId, (NodeId, Ident)>,
|
||
unused_macro_rules: FxHashMap<(LocalDefId, 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<'a>, Option<&'a NameBinding<'a>>)>,
|
||
multi_segment_macro_resolutions:
|
||
Vec<(Vec<Segment>, Span, MacroKind, ParentScope<'a>, Option<Res>)>,
|
||
builtin_attrs: Vec<(Ident, ParentScope<'a>)>,
|
||
/// `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<'a>>,
|
||
/// `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<'a>>,
|
||
/// `macro_rules` scopes produced by `macro_rules` item definitions.
|
||
macro_rules_scopes: FxHashMap<LocalDefId, MacroRulesScopeRef<'a>>,
|
||
/// Helper attributes that are in scope for the given expansion.
|
||
helper_attrs: FxHashMap<LocalExpnId, Vec<Ident>>,
|
||
/// 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<&'a Import<'a>>,
|
||
|
||
/// 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: DefIdMap<(Res, ty::Visibility, Vec<ty::Visibility>)>,
|
||
|
||
/// Features enabled for this crate.
|
||
active_features: FxHashSet<Symbol>,
|
||
|
||
lint_buffer: LintBuffer,
|
||
|
||
next_node_id: NodeId,
|
||
|
||
node_id_to_def_id: FxHashMap<ast::NodeId, 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, (LocalDefId, ImplTraitContext)>,
|
||
|
||
/// 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>,
|
||
|
||
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: FxHashMap<Span, Span>,
|
||
|
||
access_levels: AccessLevels,
|
||
}
|
||
|
||
/// Nothing really interesting here; it just provides memory for the rest of the crate.
|
||
#[derive(Default)]
|
||
pub struct ResolverArenas<'a> {
|
||
modules: TypedArena<ModuleData<'a>>,
|
||
local_modules: RefCell<Vec<Module<'a>>>,
|
||
imports: TypedArena<Import<'a>>,
|
||
name_resolutions: TypedArena<RefCell<NameResolution<'a>>>,
|
||
ast_paths: TypedArena<ast::Path>,
|
||
dropless: DroplessArena,
|
||
}
|
||
|
||
impl<'a> ResolverArenas<'a> {
|
||
fn new_module(
|
||
&'a self,
|
||
parent: Option<Module<'a>>,
|
||
kind: ModuleKind,
|
||
expn_id: ExpnId,
|
||
span: Span,
|
||
no_implicit_prelude: bool,
|
||
module_map: &mut FxHashMap<DefId, Module<'a>>,
|
||
) -> Module<'a> {
|
||
let module =
|
||
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);
|
||
}
|
||
module
|
||
}
|
||
fn local_modules(&'a self) -> std::cell::Ref<'a, Vec<Module<'a>>> {
|
||
self.local_modules.borrow()
|
||
}
|
||
fn alloc_name_binding(&'a self, name_binding: NameBinding<'a>) -> &'a NameBinding<'a> {
|
||
self.dropless.alloc(name_binding)
|
||
}
|
||
fn alloc_import(&'a self, import: Import<'a>) -> &'a Import<'_> {
|
||
self.imports.alloc(import)
|
||
}
|
||
fn alloc_name_resolution(&'a self) -> &'a RefCell<NameResolution<'a>> {
|
||
self.name_resolutions.alloc(Default::default())
|
||
}
|
||
fn alloc_macro_rules_scope(&'a self, scope: MacroRulesScope<'a>) -> MacroRulesScopeRef<'a> {
|
||
Interned::new_unchecked(self.dropless.alloc(Cell::new(scope)))
|
||
}
|
||
fn alloc_macro_rules_binding(
|
||
&'a self,
|
||
binding: MacroRulesBinding<'a>,
|
||
) -> &'a MacroRulesBinding<'a> {
|
||
self.dropless.alloc(binding)
|
||
}
|
||
fn alloc_ast_paths(&'a self, paths: &[ast::Path]) -> &'a [ast::Path] {
|
||
self.ast_paths.alloc_from_iter(paths.iter().cloned())
|
||
}
|
||
fn alloc_pattern_spans(&'a self, spans: impl Iterator<Item = Span>) -> &'a [Span] {
|
||
self.dropless.alloc_from_iter(spans)
|
||
}
|
||
}
|
||
|
||
impl<'a> AsMut<Resolver<'a>> for Resolver<'a> {
|
||
fn as_mut(&mut self) -> &mut Resolver<'a> {
|
||
self
|
||
}
|
||
}
|
||
|
||
impl<'a, 'b> DefIdTree for &'a Resolver<'b> {
|
||
#[inline]
|
||
fn opt_parent(self, id: DefId) -> Option<DefId> {
|
||
match id.as_local() {
|
||
Some(id) => self.definitions.def_key(id).parent,
|
||
None => self.cstore().def_key(id).parent,
|
||
}
|
||
.map(|index| DefId { index, ..id })
|
||
}
|
||
}
|
||
|
||
impl Resolver<'_> {
|
||
fn opt_local_def_id(&self, node: NodeId) -> Option<LocalDefId> {
|
||
self.node_id_to_def_id.get(&node).copied()
|
||
}
|
||
|
||
pub fn local_def_id(&self, node: NodeId) -> LocalDefId {
|
||
self.opt_local_def_id(node).unwrap_or_else(|| panic!("no entry for node id: `{:?}`", node))
|
||
}
|
||
|
||
/// Adds a definition with a parent definition.
|
||
fn create_def(
|
||
&mut self,
|
||
parent: LocalDefId,
|
||
node_id: ast::NodeId,
|
||
data: DefPathData,
|
||
expn_id: ExpnId,
|
||
span: Span,
|
||
) -> LocalDefId {
|
||
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.definitions.def_key(self.node_id_to_def_id[&node_id]),
|
||
);
|
||
|
||
let def_id = self.definitions.create_def(parent, data);
|
||
|
||
// 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.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, def_id);
|
||
}
|
||
assert_eq!(self.def_id_to_node_id.push(node_id), def_id);
|
||
|
||
def_id
|
||
}
|
||
|
||
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.cstore().item_generics_num_lifetimes(def_id, self.session)
|
||
}
|
||
}
|
||
}
|
||
|
||
impl<'a> Resolver<'a> {
|
||
pub fn new(
|
||
session: &'a Session,
|
||
krate: &Crate,
|
||
crate_name: &str,
|
||
metadata_loader: Box<MetadataLoaderDyn>,
|
||
arenas: &'a ResolverArenas<'a>,
|
||
) -> Resolver<'a> {
|
||
let root_def_id = CRATE_DEF_ID.to_def_id();
|
||
let mut module_map = FxHashMap::default();
|
||
let graph_root = arenas.new_module(
|
||
None,
|
||
ModuleKind::Def(DefKind::Mod, root_def_id, kw::Empty),
|
||
ExpnId::root(),
|
||
krate.spans.inner_span,
|
||
session.contains_name(&krate.attrs, sym::no_implicit_prelude),
|
||
&mut module_map,
|
||
);
|
||
let empty_module = arenas.new_module(
|
||
None,
|
||
ModuleKind::Def(DefKind::Mod, root_def_id, kw::Empty),
|
||
ExpnId::root(),
|
||
DUMMY_SP,
|
||
true,
|
||
&mut FxHashMap::default(),
|
||
);
|
||
|
||
let definitions = Definitions::new(session.local_stable_crate_id());
|
||
|
||
let mut visibilities = FxHashMap::default();
|
||
visibilities.insert(CRATE_DEF_ID, ty::Visibility::Public);
|
||
|
||
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 = FxHashMap::default();
|
||
node_id_to_def_id.insert(CRATE_NODE_ID, CRATE_DEF_ID);
|
||
|
||
let mut invocation_parents = FxHashMap::default();
|
||
invocation_parents.insert(LocalExpnId::ROOT, (CRATE_DEF_ID, ImplTraitContext::Existential));
|
||
|
||
let mut source_span = IndexVec::default();
|
||
let _id = source_span.push(krate.spans.inner_span);
|
||
debug_assert_eq!(_id, CRATE_DEF_ID);
|
||
|
||
let mut extern_prelude: FxHashMap<Ident, ExternPreludeEntry<'_>> = session
|
||
.opts
|
||
.externs
|
||
.iter()
|
||
.filter(|(_, entry)| entry.add_prelude)
|
||
.map(|(name, _)| (Ident::from_str(name), Default::default()))
|
||
.collect();
|
||
|
||
if !session.contains_name(&krate.attrs, sym::no_core) {
|
||
extern_prelude.insert(Ident::with_dummy_span(sym::core), Default::default());
|
||
if !session.contains_name(&krate.attrs, sym::no_std) {
|
||
extern_prelude.insert(Ident::with_dummy_span(sym::std), Default::default());
|
||
}
|
||
}
|
||
|
||
let (registered_attrs, registered_tools) =
|
||
macros::registered_attrs_and_tools(session, &krate.attrs);
|
||
|
||
let features = session.features_untracked();
|
||
|
||
let mut resolver = Resolver {
|
||
session,
|
||
|
||
definitions,
|
||
expn_that_defined: Default::default(),
|
||
source_span,
|
||
|
||
// The outermost module has def ID 0; this is not reflected in the
|
||
// AST.
|
||
graph_root,
|
||
prelude: None,
|
||
extern_prelude,
|
||
|
||
has_self: FxHashSet::default(),
|
||
field_names: 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(),
|
||
label_res_map: Default::default(),
|
||
lifetimes_res_map: Default::default(),
|
||
extra_lifetime_params_map: Default::default(),
|
||
extern_crate_map: Default::default(),
|
||
reexport_map: FxHashMap::default(),
|
||
trait_map: NodeMap::default(),
|
||
underscore_disambiguator: 0,
|
||
empty_module,
|
||
module_map,
|
||
block_map: Default::default(),
|
||
binding_parent_modules: FxHashMap::default(),
|
||
ast_transform_scopes: FxHashMap::default(),
|
||
|
||
glob_map: Default::default(),
|
||
visibilities,
|
||
has_pub_restricted: false,
|
||
used_imports: FxHashSet::default(),
|
||
maybe_unused_trait_imports: Default::default(),
|
||
maybe_unused_extern_crates: Vec::new(),
|
||
|
||
privacy_errors: Vec::new(),
|
||
ambiguity_errors: Vec::new(),
|
||
use_injections: Vec::new(),
|
||
macro_expanded_macro_export_errors: BTreeSet::new(),
|
||
|
||
arenas,
|
||
dummy_binding: arenas.alloc_name_binding(NameBinding {
|
||
kind: NameBindingKind::Res(Res::Err, false),
|
||
ambiguity: None,
|
||
expansion: LocalExpnId::ROOT,
|
||
span: DUMMY_SP,
|
||
vis: ty::Visibility::Public,
|
||
}),
|
||
|
||
crate_loader: CrateLoader::new(session, metadata_loader, crate_name),
|
||
macro_names: FxHashSet::default(),
|
||
builtin_macros: Default::default(),
|
||
builtin_macro_kinds: Default::default(),
|
||
registered_attrs,
|
||
registered_tools,
|
||
macro_use_prelude: FxHashMap::default(),
|
||
macro_map: FxHashMap::default(),
|
||
dummy_ext_bang: Lrc::new(SyntaxExtension::dummy_bang(session.edition())),
|
||
dummy_ext_derive: Lrc::new(SyntaxExtension::dummy_derive(session.edition())),
|
||
non_macro_attr: Lrc::new(SyntaxExtension::non_macro_attr(session.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(),
|
||
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(),
|
||
active_features: features
|
||
.declared_lib_features
|
||
.iter()
|
||
.map(|(feat, ..)| *feat)
|
||
.chain(features.declared_lang_features.iter().map(|(feat, ..)| *feat))
|
||
.collect(),
|
||
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(),
|
||
access_levels: Default::default(),
|
||
};
|
||
|
||
let root_parent_scope = ParentScope::module(graph_root, &resolver);
|
||
resolver.invocation_parent_scopes.insert(LocalExpnId::ROOT, root_parent_scope);
|
||
|
||
resolver
|
||
}
|
||
|
||
fn new_module(
|
||
&mut self,
|
||
parent: Option<Module<'a>>,
|
||
kind: ModuleKind,
|
||
expn_id: ExpnId,
|
||
span: Span,
|
||
no_implicit_prelude: bool,
|
||
) -> Module<'a> {
|
||
let module_map = &mut self.module_map;
|
||
self.arenas.new_module(parent, kind, expn_id, span, no_implicit_prelude, module_map)
|
||
}
|
||
|
||
pub 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
|
||
}
|
||
|
||
pub 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<'a> {
|
||
Default::default()
|
||
}
|
||
|
||
pub fn into_outputs(
|
||
self,
|
||
) -> (Definitions, Box<CrateStoreDyn>, ResolverOutputs, ty::ResolverAstLowering) {
|
||
let proc_macros = self.proc_macros.iter().map(|id| self.local_def_id(*id)).collect();
|
||
let definitions = self.definitions;
|
||
let cstore = Box::new(self.crate_loader.into_cstore());
|
||
let source_span = self.source_span;
|
||
let expn_that_defined = self.expn_that_defined;
|
||
let visibilities = self.visibilities;
|
||
let has_pub_restricted = self.has_pub_restricted;
|
||
let extern_crate_map = self.extern_crate_map;
|
||
let reexport_map = self.reexport_map;
|
||
let maybe_unused_trait_imports = self.maybe_unused_trait_imports;
|
||
let maybe_unused_extern_crates = self.maybe_unused_extern_crates;
|
||
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 access_levels = self.access_levels;
|
||
let resolutions = ResolverOutputs {
|
||
source_span,
|
||
expn_that_defined,
|
||
visibilities,
|
||
has_pub_restricted,
|
||
access_levels,
|
||
extern_crate_map,
|
||
reexport_map,
|
||
glob_map,
|
||
maybe_unused_trait_imports,
|
||
maybe_unused_extern_crates,
|
||
extern_prelude: self
|
||
.extern_prelude
|
||
.iter()
|
||
.map(|(ident, entry)| (ident.name, entry.introduced_by_item))
|
||
.collect(),
|
||
main_def,
|
||
trait_impls: self.trait_impls,
|
||
proc_macros,
|
||
confused_type_with_std_module,
|
||
registered_tools: self.registered_tools,
|
||
};
|
||
let resolutions_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,
|
||
def_id_to_node_id: self.def_id_to_node_id,
|
||
trait_map: self.trait_map,
|
||
builtin_macro_kinds: self.builtin_macro_kinds,
|
||
};
|
||
(definitions, cstore, resolutions, resolutions_lowering)
|
||
}
|
||
|
||
pub fn clone_outputs(
|
||
&self,
|
||
) -> (Definitions, Box<CrateStoreDyn>, ResolverOutputs, ty::ResolverAstLowering) {
|
||
let proc_macros = self.proc_macros.iter().map(|id| self.local_def_id(*id)).collect();
|
||
let definitions = self.definitions.clone();
|
||
let cstore = Box::new(self.cstore().clone());
|
||
let resolutions = ResolverOutputs {
|
||
source_span: self.source_span.clone(),
|
||
expn_that_defined: self.expn_that_defined.clone(),
|
||
visibilities: self.visibilities.clone(),
|
||
has_pub_restricted: self.has_pub_restricted,
|
||
extern_crate_map: self.extern_crate_map.clone(),
|
||
reexport_map: self.reexport_map.clone(),
|
||
glob_map: self.glob_map.clone(),
|
||
maybe_unused_trait_imports: self.maybe_unused_trait_imports.clone(),
|
||
maybe_unused_extern_crates: self.maybe_unused_extern_crates.clone(),
|
||
extern_prelude: self
|
||
.extern_prelude
|
||
.iter()
|
||
.map(|(ident, entry)| (ident.name, entry.introduced_by_item))
|
||
.collect(),
|
||
main_def: self.main_def,
|
||
trait_impls: self.trait_impls.clone(),
|
||
proc_macros,
|
||
confused_type_with_std_module: self.confused_type_with_std_module.clone(),
|
||
registered_tools: self.registered_tools.clone(),
|
||
access_levels: self.access_levels.clone(),
|
||
};
|
||
let resolutions_lowering = ty::ResolverAstLowering {
|
||
legacy_const_generic_args: self.legacy_const_generic_args.clone(),
|
||
partial_res_map: self.partial_res_map.clone(),
|
||
import_res_map: self.import_res_map.clone(),
|
||
label_res_map: self.label_res_map.clone(),
|
||
lifetimes_res_map: self.lifetimes_res_map.clone(),
|
||
extra_lifetime_params_map: self.extra_lifetime_params_map.clone(),
|
||
next_node_id: self.next_node_id.clone(),
|
||
node_id_to_def_id: self.node_id_to_def_id.clone(),
|
||
def_id_to_node_id: self.def_id_to_node_id.clone(),
|
||
trait_map: self.trait_map.clone(),
|
||
builtin_macro_kinds: self.builtin_macro_kinds.clone(),
|
||
};
|
||
(definitions, cstore, resolutions, resolutions_lowering)
|
||
}
|
||
|
||
fn create_stable_hashing_context(&self) -> StableHashingContext<'_> {
|
||
StableHashingContext::new(
|
||
self.session,
|
||
&self.definitions,
|
||
self.crate_loader.cstore(),
|
||
&self.source_span,
|
||
)
|
||
}
|
||
|
||
pub fn cstore(&self) -> &CStore {
|
||
self.crate_loader.cstore()
|
||
}
|
||
|
||
fn dummy_ext(&self, macro_kind: MacroKind) -> Lrc<SyntaxExtension> {
|
||
match macro_kind {
|
||
MacroKind::Bang => self.dummy_ext_bang.clone(),
|
||
MacroKind::Derive => self.dummy_ext_derive.clone(),
|
||
MacroKind::Attr => self.non_macro_attr.clone(),
|
||
}
|
||
}
|
||
|
||
/// 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).map_or(false, |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.session.time("resolve_crate", || {
|
||
self.session.time("finalize_imports", || ImportResolver { r: self }.finalize_imports());
|
||
self.session.time("resolve_access_levels", || {
|
||
AccessLevelsVisitor::compute_access_levels(self, krate)
|
||
});
|
||
self.session.time("finalize_macro_resolutions", || self.finalize_macro_resolutions());
|
||
self.session.time("late_resolve_crate", || self.late_resolve_crate(krate));
|
||
self.session.time("resolve_main", || self.resolve_main());
|
||
self.session.time("resolve_check_unused", || self.check_unused(krate));
|
||
self.session.time("resolve_report_errors", || self.report_errors(krate));
|
||
self.session.time("resolve_postprocess", || self.crate_loader.postprocess(krate));
|
||
});
|
||
}
|
||
|
||
pub fn traits_in_scope(
|
||
&mut self,
|
||
current_trait: Option<Module<'a>>,
|
||
parent_scope: &ParentScope<'a>,
|
||
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, false), 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<'a>,
|
||
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<'a>>,
|
||
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 {
|
||
let id = self.local_def_id(import.id);
|
||
self.maybe_unused_trait_imports.insert(id);
|
||
self.add_to_glob_map(&import, trait_name);
|
||
import_ids.push(id);
|
||
kind = &binding.kind;
|
||
}
|
||
import_ids
|
||
}
|
||
|
||
fn new_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 {
|
||
0
|
||
};
|
||
BindingKey { ident, ns, disambiguator }
|
||
}
|
||
|
||
fn resolutions(&mut self, module: Module<'a>) -> &'a Resolutions<'a> {
|
||
if module.populate_on_access.get() {
|
||
module.populate_on_access.set(false);
|
||
self.build_reduced_graph_external(module);
|
||
}
|
||
&module.lazy_resolutions
|
||
}
|
||
|
||
fn resolution(
|
||
&mut self,
|
||
module: Module<'a>,
|
||
key: BindingKey,
|
||
) -> &'a RefCell<NameResolution<'a>> {
|
||
*self
|
||
.resolutions(module)
|
||
.borrow_mut()
|
||
.entry(key)
|
||
.or_insert_with(|| self.arenas.alloc_name_resolution())
|
||
}
|
||
|
||
fn record_use(
|
||
&mut self,
|
||
ident: Ident,
|
||
used_binding: &'a NameBinding<'a>,
|
||
is_lexical_scope: bool,
|
||
) {
|
||
if let Some((b2, kind)) = used_binding.ambiguity {
|
||
self.ambiguity_errors.push(AmbiguityError {
|
||
kind,
|
||
ident,
|
||
b1: used_binding,
|
||
b2,
|
||
misc1: AmbiguityErrorMisc::None,
|
||
misc2: AmbiguityErrorMisc::None,
|
||
});
|
||
}
|
||
if let NameBindingKind::Import { import, binding, ref used } = used_binding.kind {
|
||
// 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 is_lexical_scope {
|
||
if let Some(entry) = self.extern_prelude.get(&ident.normalize_to_macros_2_0()) {
|
||
if let Some(crate_item) = entry.extern_crate_item {
|
||
if ptr::eq(used_binding, crate_item) && !entry.introduced_by_item {
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
used.set(true);
|
||
import.used.set(true);
|
||
self.used_imports.insert(import.id);
|
||
self.add_to_glob_map(&import, ident);
|
||
self.record_use(ident, binding, false);
|
||
}
|
||
}
|
||
|
||
#[inline]
|
||
fn add_to_glob_map(&mut self, import: &Import<'_>, ident: Ident) {
|
||
if import.is_glob() {
|
||
let def_id = self.local_def_id(import.id);
|
||
self.glob_map.entry(def_id).or_default().insert(ident.name);
|
||
}
|
||
}
|
||
|
||
fn resolve_crate_root(&mut self, ident: Ident) -> Module<'a> {
|
||
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<'a>) -> Module<'a> {
|
||
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 ({:?} before, {:?} now)", prev_res, resolution);
|
||
}
|
||
}
|
||
|
||
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, module: Module<'a>) -> bool {
|
||
vis.is_accessible_from(module.nearest_parent_mod(), self)
|
||
}
|
||
|
||
fn set_binding_parent_module(&mut self, binding: &'a NameBinding<'a>, module: Module<'a>) {
|
||
if let Some(old_module) =
|
||
self.binding_parent_modules.insert(Interned::new_unchecked(binding), module)
|
||
{
|
||
if !ptr::eq(module, old_module) {
|
||
span_bug!(binding.span, "parent module is reset for binding");
|
||
}
|
||
}
|
||
}
|
||
|
||
fn disambiguate_macro_rules_vs_modularized(
|
||
&self,
|
||
macro_rules: &'a NameBinding<'a>,
|
||
modularized: &'a NameBinding<'a>,
|
||
) -> 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(&Interned::new_unchecked(macro_rules)),
|
||
self.binding_parent_modules.get(&Interned::new_unchecked(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<&'a NameBinding<'a>> {
|
||
if ident.is_path_segment_keyword() {
|
||
// Make sure `self`, `super` etc produce an error when passed to here.
|
||
return None;
|
||
}
|
||
self.extern_prelude.get(&ident.normalize_to_macros_2_0()).cloned().and_then(|entry| {
|
||
if let Some(binding) = entry.extern_crate_item {
|
||
if finalize && entry.introduced_by_item {
|
||
self.record_use(ident, binding, false);
|
||
}
|
||
Some(binding)
|
||
} else {
|
||
let crate_id = if finalize {
|
||
let Some(crate_id) =
|
||
self.crate_loader.process_path_extern(ident.name, ident.span) else { return Some(self.dummy_binding); };
|
||
crate_id
|
||
} else {
|
||
self.crate_loader.maybe_process_path_extern(ident.name)?
|
||
};
|
||
let crate_root = self.expect_module(crate_id.as_def_id());
|
||
Some(
|
||
(crate_root, ty::Visibility::Public, DUMMY_SP, LocalExpnId::ROOT)
|
||
.to_name_binding(self.arenas),
|
||
)
|
||
}
|
||
})
|
||
}
|
||
|
||
/// 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.
|
||
pub fn resolve_rustdoc_path(
|
||
&mut self,
|
||
path_str: &str,
|
||
ns: Namespace,
|
||
mut parent_scope: ParentScope<'a>,
|
||
) -> 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::Crate {
|
||
// FIXME: `resolve_path` always resolves `crate` to the current crate root, but
|
||
// rustdoc wants it to resolve to the `parent_scope`'s crate root. This trick of
|
||
// replacing `crate` with `self` and changing the current module should achieve
|
||
// the same effect.
|
||
segment.ident.name = kw::SelfLower;
|
||
parent_scope.module =
|
||
self.expect_module(parent_scope.module.def_id().krate.as_def_id());
|
||
} else if segment.ident.name == kw::Empty {
|
||
segment.ident.name = kw::PathRoot;
|
||
}
|
||
}
|
||
|
||
match self.maybe_resolve_path(&segments, Some(ns), &parent_scope) {
|
||
PathResult::Module(ModuleOrUniformRoot::Module(module)) => Some(module.res().unwrap()),
|
||
PathResult::NonModule(path_res) if path_res.unresolved_segments() == 0 => {
|
||
Some(path_res.base_res())
|
||
}
|
||
PathResult::Module(ModuleOrUniformRoot::ExternPrelude)
|
||
| PathResult::NonModule(..)
|
||
| PathResult::Failed { .. } => None,
|
||
PathResult::Module(..) | PathResult::Indeterminate => unreachable!(),
|
||
}
|
||
}
|
||
|
||
/// For rustdoc.
|
||
/// For local modules returns only reexports, for external modules returns all children.
|
||
pub fn module_children_or_reexports(&self, def_id: DefId) -> Vec<ModChild> {
|
||
if let Some(def_id) = def_id.as_local() {
|
||
self.reexport_map.get(&def_id).cloned().unwrap_or_default()
|
||
} else {
|
||
self.cstore().module_children_untracked(def_id, self.session)
|
||
}
|
||
}
|
||
|
||
/// For rustdoc.
|
||
pub fn macro_rules_scope(&self, def_id: LocalDefId) -> (MacroRulesScopeRef<'a>, Res) {
|
||
let scope = *self.macro_rules_scopes.get(&def_id).expect("not a `macro_rules` item");
|
||
match scope.get() {
|
||
MacroRulesScope::Binding(mb) => (scope, mb.binding.res()),
|
||
_ => unreachable!(),
|
||
}
|
||
}
|
||
|
||
/// Retrieves the span of the given `DefId` if `DefId` is in the local crate.
|
||
#[inline]
|
||
pub fn opt_span(&self, def_id: DefId) -> Option<Span> {
|
||
def_id.as_local().map(|def_id| self.source_span[def_id])
|
||
}
|
||
|
||
/// Checks if an expression refers to a function marked with
|
||
/// `#[rustc_legacy_const_generics]` and returns the argument index list
|
||
/// from the attribute.
|
||
pub 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 partial_res = self.partial_res_map.get(&expr.id)?;
|
||
if partial_res.unresolved_segments() != 0 {
|
||
return None;
|
||
}
|
||
|
||
if let Res::Def(def::DefKind::Fn, def_id) = partial_res.base_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
|
||
.cstore()
|
||
.item_attrs_untracked(def_id, self.session)
|
||
.find(|a| a.has_name(sym::rustc_legacy_const_generics))?;
|
||
let mut ret = Vec::new();
|
||
for meta in attr.meta_item_list()? {
|
||
match meta.literal()?.kind {
|
||
LitKind::Int(a, _) => ret.push(a as usize),
|
||
_ => panic!("invalid arg index"),
|
||
}
|
||
}
|
||
// Cache the lookup to avoid parsing attributes for an iterm 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,
|
||
) 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, false);
|
||
}
|
||
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 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,
|
||
}
|
||
|
||
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 }
|
||
}
|
||
}
|
||
|
||
pub fn provide(providers: &mut Providers) {
|
||
late::lifetimes::provide(providers);
|
||
}
|