3545 lines
143 KiB
Rust
3545 lines
143 KiB
Rust
// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![crate_name = "rustc_resolve"]
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#![unstable(feature = "rustc_private", issue = "27812")]
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#![crate_type = "dylib"]
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#![crate_type = "rlib"]
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#![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
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html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
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html_root_url = "https://doc.rust-lang.org/nightly/")]
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#![cfg_attr(not(stage0), deny(warnings))]
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#![feature(associated_consts)]
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#![feature(borrow_state)]
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#![feature(dotdot_in_tuple_patterns)]
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#![feature(rustc_diagnostic_macros)]
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#![feature(rustc_private)]
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#![feature(staged_api)]
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#[macro_use]
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extern crate log;
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#[macro_use]
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extern crate syntax;
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extern crate syntax_pos;
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extern crate rustc_errors as errors;
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extern crate arena;
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#[macro_use]
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extern crate rustc;
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use self::Namespace::*;
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use self::ResolveResult::*;
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use self::FallbackSuggestion::*;
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use self::TypeParameters::*;
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use self::RibKind::*;
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use self::UseLexicalScopeFlag::*;
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use self::ModulePrefixResult::*;
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use self::ParentLink::*;
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use rustc::hir::map::Definitions;
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use rustc::hir::{self, PrimTy, TyBool, TyChar, TyFloat, TyInt, TyUint, TyStr};
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use rustc::middle::cstore::MacroLoader;
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use rustc::session::Session;
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use rustc::lint;
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use rustc::hir::def::*;
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use rustc::hir::def_id::{CrateNum, CRATE_DEF_INDEX, DefId};
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use rustc::ty;
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use rustc::hir::{Freevar, FreevarMap, TraitCandidate, TraitMap, GlobMap};
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use rustc::util::nodemap::{NodeMap, NodeSet, FnvHashMap, FnvHashSet};
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use syntax::ext::hygiene::Mark;
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use syntax::ast::{self, FloatTy};
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use syntax::ast::{CRATE_NODE_ID, Name, NodeId, IntTy, UintTy};
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use syntax::parse::token::{self, keywords};
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use syntax::util::lev_distance::find_best_match_for_name;
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use syntax::visit::{self, FnKind, Visitor};
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use syntax::ast::{Arm, BindingMode, Block, Crate, Expr, ExprKind};
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use syntax::ast::{FnDecl, ForeignItem, ForeignItemKind, Generics};
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use syntax::ast::{Item, ItemKind, ImplItem, ImplItemKind};
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use syntax::ast::{Local, Mutability, Pat, PatKind, Path};
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use syntax::ast::{PathSegment, PathParameters, QSelf, TraitItemKind, TraitRef, Ty, TyKind};
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use syntax_pos::{Span, DUMMY_SP};
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use errors::DiagnosticBuilder;
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use std::cell::{Cell, RefCell};
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use std::fmt;
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use std::mem::replace;
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use resolve_imports::{ImportDirective, NameResolution};
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// NB: This module needs to be declared first so diagnostics are
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// registered before they are used.
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mod diagnostics;
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mod macros;
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mod check_unused;
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mod build_reduced_graph;
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mod resolve_imports;
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enum SuggestionType {
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Macro(String),
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Function(token::InternedString),
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NotFound,
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}
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/// Candidates for a name resolution failure
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struct SuggestedCandidates {
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name: String,
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candidates: Vec<Path>,
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}
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enum ResolutionError<'a> {
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/// error E0401: can't use type parameters from outer function
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TypeParametersFromOuterFunction,
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/// error E0402: cannot use an outer type parameter in this context
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OuterTypeParameterContext,
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/// error E0403: the name is already used for a type parameter in this type parameter list
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NameAlreadyUsedInTypeParameterList(Name, &'a Span),
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/// error E0404: is not a trait
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IsNotATrait(&'a str),
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/// error E0405: use of undeclared trait name
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UndeclaredTraitName(&'a str, SuggestedCandidates),
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/// error E0407: method is not a member of trait
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MethodNotMemberOfTrait(Name, &'a str),
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/// error E0437: type is not a member of trait
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TypeNotMemberOfTrait(Name, &'a str),
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/// error E0438: const is not a member of trait
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ConstNotMemberOfTrait(Name, &'a str),
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/// error E0408: variable `{}` from pattern #{} is not bound in pattern #{}
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VariableNotBoundInPattern(Name, usize, usize),
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/// error E0409: variable is bound with different mode in pattern #{} than in pattern #1
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VariableBoundWithDifferentMode(Name, usize, Span),
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/// error E0411: use of `Self` outside of an impl or trait
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SelfUsedOutsideImplOrTrait,
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/// error E0412: use of undeclared
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UseOfUndeclared(&'a str, &'a str, SuggestedCandidates),
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/// error E0415: identifier is bound more than once in this parameter list
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IdentifierBoundMoreThanOnceInParameterList(&'a str),
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/// error E0416: identifier is bound more than once in the same pattern
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IdentifierBoundMoreThanOnceInSamePattern(&'a str),
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/// error E0422: does not name a struct
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DoesNotNameAStruct(&'a str),
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/// error E0423: is a struct variant name, but this expression uses it like a function name
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StructVariantUsedAsFunction(&'a str),
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/// error E0424: `self` is not available in a static method
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SelfNotAvailableInStaticMethod,
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/// error E0425: unresolved name
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UnresolvedName {
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path: &'a str,
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message: &'a str,
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context: UnresolvedNameContext<'a>,
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is_static_method: bool,
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is_field: bool,
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def: Def,
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},
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/// error E0426: use of undeclared label
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UndeclaredLabel(&'a str),
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/// error E0429: `self` imports are only allowed within a { } list
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SelfImportsOnlyAllowedWithin,
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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 E0432: unresolved import
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UnresolvedImport(Option<(&'a str, &'a str)>),
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/// error E0433: failed to resolve
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FailedToResolve(&'a str),
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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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/// error E0530: X bindings cannot shadow Ys
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BindingShadowsSomethingUnacceptable(&'a str, Name, &'a NameBinding<'a>),
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/// error E0531: unresolved pattern path kind `name`
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PatPathUnresolved(&'a str, &'a Path),
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/// error E0532: expected pattern path kind, found another pattern path kind
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PatPathUnexpected(&'a str, &'a str, &'a Path),
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}
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/// Context of where `ResolutionError::UnresolvedName` arose.
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#[derive(Clone, PartialEq, Eq, Debug)]
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enum UnresolvedNameContext<'a> {
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/// `PathIsMod(parent)` indicates that a given path, used in
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/// expression context, actually resolved to a module rather than
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/// a value. The optional expression attached to the variant is the
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/// the parent of the erroneous path expression.
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PathIsMod(Option<&'a Expr>),
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/// `Other` means we have no extra information about the context
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/// of the unresolved name error. (Maybe we could eliminate all
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/// such cases; but for now, this is an information-free default.)
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Other,
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}
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fn resolve_error<'b, 'a: 'b, 'c>(resolver: &'b Resolver<'a>,
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span: syntax_pos::Span,
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resolution_error: ResolutionError<'c>) {
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resolve_struct_error(resolver, span, resolution_error).emit();
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}
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fn resolve_struct_error<'b, 'a: 'b, 'c>(resolver: &'b Resolver<'a>,
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span: syntax_pos::Span,
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resolution_error: ResolutionError<'c>)
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-> DiagnosticBuilder<'a> {
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if !resolver.emit_errors {
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return resolver.session.diagnostic().struct_dummy();
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}
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match resolution_error {
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ResolutionError::TypeParametersFromOuterFunction => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0401,
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"can't use type parameters from outer function; \
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try using a local type parameter instead");
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err.span_label(span, &format!("use of type variable from outer function"));
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err
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}
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ResolutionError::OuterTypeParameterContext => {
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struct_span_err!(resolver.session,
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span,
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E0402,
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"cannot use an outer type parameter in this context")
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}
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ResolutionError::NameAlreadyUsedInTypeParameterList(name, first_use_span) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0403,
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"the name `{}` is already used for a type parameter \
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in this type parameter list",
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name);
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err.span_label(span, &format!("already used"));
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err.span_label(first_use_span.clone(), &format!("first use of `{}`", name));
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err
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}
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ResolutionError::IsNotATrait(name) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0404,
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"`{}` is not a trait",
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name);
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err.span_label(span, &format!("not a trait"));
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err
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}
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ResolutionError::UndeclaredTraitName(name, candidates) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0405,
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"trait `{}` is not in scope",
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name);
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show_candidates(&mut err, &candidates);
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err.span_label(span, &format!("`{}` is not in scope", name));
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err
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}
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ResolutionError::MethodNotMemberOfTrait(method, trait_) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0407,
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"method `{}` is not a member of trait `{}`",
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method,
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trait_);
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err.span_label(span, &format!("not a member of trait `{}`", trait_));
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err
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}
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ResolutionError::TypeNotMemberOfTrait(type_, trait_) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0437,
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"type `{}` is not a member of trait `{}`",
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type_,
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trait_);
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err.span_label(span, &format!("not a member of trait `{}`", trait_));
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err
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}
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ResolutionError::ConstNotMemberOfTrait(const_, trait_) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0438,
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"const `{}` is not a member of trait `{}`",
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const_,
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trait_);
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err.span_label(span, &format!("not a member of trait `{}`", trait_));
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err
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}
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ResolutionError::VariableNotBoundInPattern(variable_name, from, to) => {
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struct_span_err!(resolver.session,
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span,
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E0408,
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"variable `{}` from pattern #{} is not bound in pattern #{}",
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variable_name,
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from,
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to)
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}
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ResolutionError::VariableBoundWithDifferentMode(variable_name,
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pattern_number,
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first_binding_span) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0409,
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"variable `{}` is bound with different mode in pattern #{} than in \
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pattern #1",
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variable_name,
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pattern_number);
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err.span_label(span, &format!("bound in different ways"));
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err.span_label(first_binding_span, &format!("first binding"));
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err
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}
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ResolutionError::SelfUsedOutsideImplOrTrait => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0411,
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"use of `Self` outside of an impl or trait");
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err.span_label(span, &format!("used outside of impl or trait"));
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err
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}
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ResolutionError::UseOfUndeclared(kind, name, candidates) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0412,
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"{} `{}` is undefined or not in scope",
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kind,
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name);
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show_candidates(&mut err, &candidates);
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err.span_label(span, &format!("undefined or not in scope"));
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err
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}
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ResolutionError::IdentifierBoundMoreThanOnceInParameterList(identifier) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0415,
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"identifier `{}` is bound more than once in this parameter list",
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identifier);
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err.span_label(span, &format!("used as parameter more than once"));
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err
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}
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ResolutionError::IdentifierBoundMoreThanOnceInSamePattern(identifier) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0416,
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"identifier `{}` is bound more than once in the same pattern",
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identifier);
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err.span_label(span, &format!("used in a pattern more than once"));
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err
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}
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ResolutionError::DoesNotNameAStruct(name) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0422,
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"`{}` does not name a structure",
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name);
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err.span_label(span, &format!("not a structure"));
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err
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}
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ResolutionError::StructVariantUsedAsFunction(path_name) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0423,
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"`{}` is the name of a struct or struct variant, but this expression \
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uses it like a function name",
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path_name);
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err.span_label(span, &format!("struct called like a function"));
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err
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}
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ResolutionError::SelfNotAvailableInStaticMethod => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0424,
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"`self` is not available in a static method");
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err.span_label(span, &format!("not available in static method"));
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err.note(&format!("maybe a `self` argument is missing?"));
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err
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}
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ResolutionError::UnresolvedName { path, message: msg, context, is_static_method,
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is_field, def } => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0425,
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"unresolved name `{}`{}",
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path,
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msg);
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match context {
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UnresolvedNameContext::Other => {
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if msg.is_empty() && is_static_method && is_field {
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err.help("this is an associated function, you don't have access to \
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this type's fields or methods");
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}
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}
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UnresolvedNameContext::PathIsMod(parent) => {
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err.help(&match parent.map(|parent| &parent.node) {
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Some(&ExprKind::Field(_, ident)) => {
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format!("to reference an item from the `{module}` module, \
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use `{module}::{ident}`",
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module = path,
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ident = ident.node)
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}
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Some(&ExprKind::MethodCall(ident, ..)) => {
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format!("to call a function from the `{module}` module, \
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use `{module}::{ident}(..)`",
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module = path,
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ident = ident.node)
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}
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_ => {
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format!("{def} `{module}` cannot be used as an expression",
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def = def.kind_name(),
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module = path)
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}
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});
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}
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}
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err
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}
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ResolutionError::UndeclaredLabel(name) => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0426,
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"use of undeclared label `{}`",
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name);
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err.span_label(span, &format!("undeclared label `{}`",&name));
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err
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}
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ResolutionError::SelfImportsOnlyAllowedWithin => {
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struct_span_err!(resolver.session,
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span,
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E0429,
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"{}",
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"`self` imports are only allowed within a { } list")
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}
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ResolutionError::SelfImportCanOnlyAppearOnceInTheList => {
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struct_span_err!(resolver.session,
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span,
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E0430,
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"`self` import can only appear once in the list")
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}
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ResolutionError::SelfImportOnlyInImportListWithNonEmptyPrefix => {
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struct_span_err!(resolver.session,
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span,
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E0431,
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"`self` import can only appear in an import list with a \
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non-empty prefix")
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}
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ResolutionError::UnresolvedImport(name) => {
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let msg = match name {
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Some((n, _)) => format!("unresolved import `{}`", n),
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None => "unresolved import".to_owned(),
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};
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let mut err = struct_span_err!(resolver.session, span, E0432, "{}", msg);
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if let Some((_, p)) = name {
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err.span_label(span, &p);
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}
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err
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}
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ResolutionError::FailedToResolve(msg) => {
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let mut err = struct_span_err!(resolver.session, span, E0433,
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"failed to resolve. {}", msg);
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err.span_label(span, &msg);
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err
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}
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ResolutionError::CannotCaptureDynamicEnvironmentInFnItem => {
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struct_span_err!(resolver.session,
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span,
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E0434,
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"{}",
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"can't capture dynamic environment in a fn item; use the || { ... } \
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closure form instead")
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}
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ResolutionError::AttemptToUseNonConstantValueInConstant => {
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let mut err = struct_span_err!(resolver.session,
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span,
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E0435,
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"attempt to use a non-constant value in a constant");
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err.span_label(span, &format!("non-constant used with constant"));
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err
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}
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ResolutionError::BindingShadowsSomethingUnacceptable(what_binding, name, binding) => {
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let shadows_what = PathResolution::new(binding.def()).kind_name();
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let mut err = struct_span_err!(resolver.session,
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span,
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E0530,
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"{}s cannot shadow {}s", what_binding, shadows_what);
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err.span_label(span, &format!("cannot be named the same as a {}", shadows_what));
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let participle = if binding.is_import() { "imported" } else { "defined" };
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let msg = &format!("a {} `{}` is {} here", shadows_what, name, participle);
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err.span_label(binding.span, msg);
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err
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}
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ResolutionError::PatPathUnresolved(expected_what, path) => {
|
|
struct_span_err!(resolver.session,
|
|
span,
|
|
E0531,
|
|
"unresolved {} `{}`",
|
|
expected_what,
|
|
path.segments.last().unwrap().identifier)
|
|
}
|
|
ResolutionError::PatPathUnexpected(expected_what, found_what, path) => {
|
|
struct_span_err!(resolver.session,
|
|
span,
|
|
E0532,
|
|
"expected {}, found {} `{}`",
|
|
expected_what,
|
|
found_what,
|
|
path.segments.last().unwrap().identifier)
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Copy, Clone)]
|
|
struct BindingInfo {
|
|
span: Span,
|
|
binding_mode: BindingMode,
|
|
}
|
|
|
|
// Map from the name in a pattern to its binding mode.
|
|
type BindingMap = FnvHashMap<ast::Ident, BindingInfo>;
|
|
|
|
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
|
|
enum PatternSource {
|
|
Match,
|
|
IfLet,
|
|
WhileLet,
|
|
Let,
|
|
For,
|
|
FnParam,
|
|
}
|
|
|
|
impl PatternSource {
|
|
fn is_refutable(self) -> bool {
|
|
match self {
|
|
PatternSource::Match | PatternSource::IfLet | PatternSource::WhileLet => true,
|
|
PatternSource::Let | PatternSource::For | PatternSource::FnParam => false,
|
|
}
|
|
}
|
|
fn descr(self) -> &'static str {
|
|
match self {
|
|
PatternSource::Match => "match binding",
|
|
PatternSource::IfLet => "if let binding",
|
|
PatternSource::WhileLet => "while let binding",
|
|
PatternSource::Let => "let binding",
|
|
PatternSource::For => "for binding",
|
|
PatternSource::FnParam => "function parameter",
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
|
|
pub enum Namespace {
|
|
TypeNS,
|
|
ValueNS,
|
|
}
|
|
|
|
impl<'a> Visitor for Resolver<'a> {
|
|
fn visit_item(&mut self, item: &Item) {
|
|
self.resolve_item(item);
|
|
}
|
|
fn visit_arm(&mut self, arm: &Arm) {
|
|
self.resolve_arm(arm);
|
|
}
|
|
fn visit_block(&mut self, block: &Block) {
|
|
self.resolve_block(block);
|
|
}
|
|
fn visit_expr(&mut self, expr: &Expr) {
|
|
self.resolve_expr(expr, None);
|
|
}
|
|
fn visit_local(&mut self, local: &Local) {
|
|
self.resolve_local(local);
|
|
}
|
|
fn visit_ty(&mut self, ty: &Ty) {
|
|
self.resolve_type(ty);
|
|
}
|
|
fn visit_poly_trait_ref(&mut self, tref: &ast::PolyTraitRef, m: &ast::TraitBoundModifier) {
|
|
match self.resolve_trait_reference(tref.trait_ref.ref_id, &tref.trait_ref.path, 0) {
|
|
Ok(def) => self.record_def(tref.trait_ref.ref_id, def),
|
|
Err(_) => {
|
|
// error already reported
|
|
self.record_def(tref.trait_ref.ref_id, err_path_resolution())
|
|
}
|
|
}
|
|
visit::walk_poly_trait_ref(self, tref, m);
|
|
}
|
|
fn visit_variant(&mut self,
|
|
variant: &ast::Variant,
|
|
generics: &Generics,
|
|
item_id: ast::NodeId) {
|
|
if let Some(ref dis_expr) = variant.node.disr_expr {
|
|
// resolve the discriminator expr as a constant
|
|
self.with_constant_rib(|this| {
|
|
this.visit_expr(dis_expr);
|
|
});
|
|
}
|
|
|
|
// `visit::walk_variant` without the discriminant expression.
|
|
self.visit_variant_data(&variant.node.data,
|
|
variant.node.name,
|
|
generics,
|
|
item_id,
|
|
variant.span);
|
|
}
|
|
fn visit_foreign_item(&mut self, foreign_item: &ForeignItem) {
|
|
let type_parameters = match foreign_item.node {
|
|
ForeignItemKind::Fn(_, ref generics) => {
|
|
HasTypeParameters(generics, ItemRibKind)
|
|
}
|
|
ForeignItemKind::Static(..) => NoTypeParameters,
|
|
};
|
|
self.with_type_parameter_rib(type_parameters, |this| {
|
|
visit::walk_foreign_item(this, foreign_item);
|
|
});
|
|
}
|
|
fn visit_fn(&mut self,
|
|
function_kind: FnKind,
|
|
declaration: &FnDecl,
|
|
block: &Block,
|
|
_: Span,
|
|
node_id: NodeId) {
|
|
let rib_kind = match function_kind {
|
|
FnKind::ItemFn(_, generics, ..) => {
|
|
self.visit_generics(generics);
|
|
ItemRibKind
|
|
}
|
|
FnKind::Method(_, sig, _) => {
|
|
self.visit_generics(&sig.generics);
|
|
MethodRibKind(!sig.decl.has_self())
|
|
}
|
|
FnKind::Closure => ClosureRibKind(node_id),
|
|
};
|
|
self.resolve_function(rib_kind, declaration, block);
|
|
}
|
|
}
|
|
|
|
pub type ErrorMessage = Option<(Span, String)>;
|
|
|
|
#[derive(Clone, PartialEq, Eq)]
|
|
pub enum ResolveResult<T> {
|
|
Failed(ErrorMessage), // Failed to resolve the name, optional helpful error message.
|
|
Indeterminate, // Couldn't determine due to unresolved globs.
|
|
Success(T), // Successfully resolved the import.
|
|
}
|
|
|
|
impl<T> ResolveResult<T> {
|
|
fn and_then<U, F: FnOnce(T) -> ResolveResult<U>>(self, f: F) -> ResolveResult<U> {
|
|
match self {
|
|
Failed(msg) => Failed(msg),
|
|
Indeterminate => Indeterminate,
|
|
Success(t) => f(t),
|
|
}
|
|
}
|
|
|
|
fn success(self) -> Option<T> {
|
|
match self {
|
|
Success(t) => Some(t),
|
|
_ => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
enum FallbackSuggestion {
|
|
NoSuggestion,
|
|
Field,
|
|
TraitItem,
|
|
TraitMethod(String),
|
|
}
|
|
|
|
#[derive(Copy, Clone)]
|
|
enum TypeParameters<'a, 'b> {
|
|
NoTypeParameters,
|
|
HasTypeParameters(// Type parameters.
|
|
&'b Generics,
|
|
|
|
// The kind of the rib used for type parameters.
|
|
RibKind<'a>),
|
|
}
|
|
|
|
// The rib kind controls the translation of local
|
|
// definitions (`Def::Local`) to upvars (`Def::Upvar`).
|
|
#[derive(Copy, Clone, Debug)]
|
|
enum RibKind<'a> {
|
|
// No translation needs to be applied.
|
|
NormalRibKind,
|
|
|
|
// We passed through a closure scope at the given node ID.
|
|
// Translate upvars as appropriate.
|
|
ClosureRibKind(NodeId /* func id */),
|
|
|
|
// We passed through an impl or trait and are now in one of its
|
|
// methods. Allow references to ty params that impl or trait
|
|
// binds. Disallow any other upvars (including other ty params that are
|
|
// upvars).
|
|
//
|
|
// The boolean value represents the fact that this method is static or not.
|
|
MethodRibKind(bool),
|
|
|
|
// We passed through an item scope. Disallow upvars.
|
|
ItemRibKind,
|
|
|
|
// We're in a constant item. Can't refer to dynamic stuff.
|
|
ConstantItemRibKind,
|
|
|
|
// We passed through a module.
|
|
ModuleRibKind(Module<'a>),
|
|
|
|
// We passed through a `macro_rules!` statement with the given expansion
|
|
MacroDefinition(Mark),
|
|
}
|
|
|
|
#[derive(Copy, Clone)]
|
|
enum UseLexicalScopeFlag {
|
|
DontUseLexicalScope,
|
|
UseLexicalScope,
|
|
}
|
|
|
|
enum ModulePrefixResult<'a> {
|
|
NoPrefixFound,
|
|
PrefixFound(Module<'a>, usize),
|
|
}
|
|
|
|
/// One local scope.
|
|
#[derive(Debug)]
|
|
struct Rib<'a> {
|
|
bindings: FnvHashMap<ast::Ident, Def>,
|
|
kind: RibKind<'a>,
|
|
}
|
|
|
|
impl<'a> Rib<'a> {
|
|
fn new(kind: RibKind<'a>) -> Rib<'a> {
|
|
Rib {
|
|
bindings: FnvHashMap(),
|
|
kind: kind,
|
|
}
|
|
}
|
|
}
|
|
|
|
/// A definition along with the index of the rib it was found on
|
|
struct LocalDef {
|
|
ribs: Option<(Namespace, usize)>,
|
|
def: Def,
|
|
}
|
|
|
|
impl LocalDef {
|
|
fn from_def(def: Def) -> Self {
|
|
LocalDef {
|
|
ribs: None,
|
|
def: def,
|
|
}
|
|
}
|
|
}
|
|
|
|
enum LexicalScopeBinding<'a> {
|
|
Item(&'a NameBinding<'a>),
|
|
LocalDef(LocalDef),
|
|
}
|
|
|
|
impl<'a> LexicalScopeBinding<'a> {
|
|
fn local_def(self) -> LocalDef {
|
|
match self {
|
|
LexicalScopeBinding::LocalDef(local_def) => local_def,
|
|
LexicalScopeBinding::Item(binding) => LocalDef::from_def(binding.def()),
|
|
}
|
|
}
|
|
|
|
fn item(self) -> Option<&'a NameBinding<'a>> {
|
|
match self {
|
|
LexicalScopeBinding::Item(binding) => Some(binding),
|
|
_ => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
/// The link from a module up to its nearest parent node.
|
|
#[derive(Clone,Debug)]
|
|
enum ParentLink<'a> {
|
|
NoParentLink,
|
|
ModuleParentLink(Module<'a>, Name),
|
|
BlockParentLink(Module<'a>, NodeId),
|
|
}
|
|
|
|
/// One node in the tree of modules.
|
|
pub struct ModuleS<'a> {
|
|
parent_link: ParentLink<'a>,
|
|
def: Option<Def>,
|
|
|
|
// The node id of the closest normal module (`mod`) ancestor (including this module).
|
|
normal_ancestor_id: Option<NodeId>,
|
|
|
|
// If the module is an extern crate, `def` is root of the external crate and `extern_crate_id`
|
|
// is the NodeId of the local `extern crate` item (otherwise, `extern_crate_id` is None).
|
|
extern_crate_id: Option<NodeId>,
|
|
|
|
resolutions: RefCell<FnvHashMap<(Name, Namespace), &'a RefCell<NameResolution<'a>>>>,
|
|
|
|
no_implicit_prelude: Cell<bool>,
|
|
|
|
glob_importers: RefCell<Vec<&'a ImportDirective<'a>>>,
|
|
globs: RefCell<Vec<&'a ImportDirective<'a>>>,
|
|
|
|
// Used to memoize the traits in this module for faster searches through all traits in scope.
|
|
traits: RefCell<Option<Box<[(Name, &'a NameBinding<'a>)]>>>,
|
|
|
|
// Whether this module is populated. If not populated, any attempt to
|
|
// access the children must be preceded with a
|
|
// `populate_module_if_necessary` call.
|
|
populated: Cell<bool>,
|
|
}
|
|
|
|
pub type Module<'a> = &'a ModuleS<'a>;
|
|
|
|
impl<'a> ModuleS<'a> {
|
|
fn new(parent_link: ParentLink<'a>, def: Option<Def>, normal_ancestor_id: Option<NodeId>)
|
|
-> Self {
|
|
ModuleS {
|
|
parent_link: parent_link,
|
|
def: def,
|
|
normal_ancestor_id: normal_ancestor_id,
|
|
extern_crate_id: None,
|
|
resolutions: RefCell::new(FnvHashMap()),
|
|
no_implicit_prelude: Cell::new(false),
|
|
glob_importers: RefCell::new(Vec::new()),
|
|
globs: RefCell::new((Vec::new())),
|
|
traits: RefCell::new(None),
|
|
populated: Cell::new(normal_ancestor_id.is_some()),
|
|
}
|
|
}
|
|
|
|
fn for_each_child<F: FnMut(Name, Namespace, &'a NameBinding<'a>)>(&self, mut f: F) {
|
|
for (&(name, ns), name_resolution) in self.resolutions.borrow().iter() {
|
|
name_resolution.borrow().binding.map(|binding| f(name, ns, binding));
|
|
}
|
|
}
|
|
|
|
fn def_id(&self) -> Option<DefId> {
|
|
self.def.as_ref().map(Def::def_id)
|
|
}
|
|
|
|
// `self` resolves to the first module ancestor that `is_normal`.
|
|
fn is_normal(&self) -> bool {
|
|
match self.def {
|
|
Some(Def::Mod(_)) => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
fn is_trait(&self) -> bool {
|
|
match self.def {
|
|
Some(Def::Trait(_)) => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
fn parent(&self) -> Option<&'a Self> {
|
|
match self.parent_link {
|
|
ModuleParentLink(parent, _) | BlockParentLink(parent, _) => Some(parent),
|
|
NoParentLink => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> fmt::Debug for ModuleS<'a> {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
write!(f, "{:?}", self.def)
|
|
}
|
|
}
|
|
|
|
// Records a possibly-private value, type, or module definition.
|
|
#[derive(Clone, Debug)]
|
|
pub struct NameBinding<'a> {
|
|
kind: NameBindingKind<'a>,
|
|
span: Span,
|
|
vis: ty::Visibility,
|
|
}
|
|
|
|
pub trait ToNameBinding<'a> {
|
|
fn to_name_binding(self) -> NameBinding<'a>;
|
|
}
|
|
|
|
impl<'a> ToNameBinding<'a> for NameBinding<'a> {
|
|
fn to_name_binding(self) -> NameBinding<'a> {
|
|
self
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Debug)]
|
|
enum NameBindingKind<'a> {
|
|
Def(Def),
|
|
Module(Module<'a>),
|
|
Import {
|
|
binding: &'a NameBinding<'a>,
|
|
directive: &'a ImportDirective<'a>,
|
|
used: Cell<bool>,
|
|
},
|
|
Ambiguity {
|
|
b1: &'a NameBinding<'a>,
|
|
b2: &'a NameBinding<'a>,
|
|
}
|
|
}
|
|
|
|
struct PrivacyError<'a>(Span, Name, &'a NameBinding<'a>);
|
|
|
|
struct AmbiguityError<'a> {
|
|
span: Span,
|
|
name: Name,
|
|
b1: &'a NameBinding<'a>,
|
|
b2: &'a NameBinding<'a>,
|
|
}
|
|
|
|
impl<'a> NameBinding<'a> {
|
|
fn module(&self) -> Result<Module<'a>, bool /* true if an error has already been reported */> {
|
|
match self.kind {
|
|
NameBindingKind::Module(module) => Ok(module),
|
|
NameBindingKind::Import { binding, .. } => binding.module(),
|
|
NameBindingKind::Def(Def::Err) => Err(true),
|
|
NameBindingKind::Def(_) => Err(false),
|
|
NameBindingKind::Ambiguity { .. } => Err(false),
|
|
}
|
|
}
|
|
|
|
fn def(&self) -> Def {
|
|
match self.kind {
|
|
NameBindingKind::Def(def) => def,
|
|
NameBindingKind::Module(module) => module.def.unwrap(),
|
|
NameBindingKind::Import { binding, .. } => binding.def(),
|
|
NameBindingKind::Ambiguity { .. } => Def::Err,
|
|
}
|
|
}
|
|
|
|
// We sometimes need to treat variants as `pub` for backwards compatibility
|
|
fn pseudo_vis(&self) -> ty::Visibility {
|
|
if self.is_variant() { ty::Visibility::Public } else { self.vis }
|
|
}
|
|
|
|
fn is_variant(&self) -> bool {
|
|
match self.kind {
|
|
NameBindingKind::Def(Def::Variant(..)) => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
fn is_extern_crate(&self) -> bool {
|
|
self.module().ok().and_then(|module| module.extern_crate_id).is_some()
|
|
}
|
|
|
|
fn is_import(&self) -> bool {
|
|
match self.kind {
|
|
NameBindingKind::Import { .. } => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
fn is_glob_import(&self) -> bool {
|
|
match self.kind {
|
|
NameBindingKind::Import { directive, .. } => directive.is_glob(),
|
|
NameBindingKind::Ambiguity { .. } => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
fn is_importable(&self) -> bool {
|
|
match self.def() {
|
|
Def::AssociatedConst(..) | Def::Method(..) | Def::AssociatedTy(..) => false,
|
|
_ => true,
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Interns the names of the primitive types.
|
|
struct PrimitiveTypeTable {
|
|
primitive_types: FnvHashMap<Name, PrimTy>,
|
|
}
|
|
|
|
impl PrimitiveTypeTable {
|
|
fn new() -> PrimitiveTypeTable {
|
|
let mut table = PrimitiveTypeTable { primitive_types: FnvHashMap() };
|
|
|
|
table.intern("bool", TyBool);
|
|
table.intern("char", TyChar);
|
|
table.intern("f32", TyFloat(FloatTy::F32));
|
|
table.intern("f64", TyFloat(FloatTy::F64));
|
|
table.intern("isize", TyInt(IntTy::Is));
|
|
table.intern("i8", TyInt(IntTy::I8));
|
|
table.intern("i16", TyInt(IntTy::I16));
|
|
table.intern("i32", TyInt(IntTy::I32));
|
|
table.intern("i64", TyInt(IntTy::I64));
|
|
table.intern("str", TyStr);
|
|
table.intern("usize", TyUint(UintTy::Us));
|
|
table.intern("u8", TyUint(UintTy::U8));
|
|
table.intern("u16", TyUint(UintTy::U16));
|
|
table.intern("u32", TyUint(UintTy::U32));
|
|
table.intern("u64", TyUint(UintTy::U64));
|
|
|
|
table
|
|
}
|
|
|
|
fn intern(&mut self, string: &str, primitive_type: PrimTy) {
|
|
self.primitive_types.insert(token::intern(string), primitive_type);
|
|
}
|
|
}
|
|
|
|
/// The main resolver class.
|
|
pub struct Resolver<'a> {
|
|
session: &'a Session,
|
|
|
|
pub definitions: Definitions,
|
|
|
|
// Maps the node id of a statement to the expansions of the `macro_rules!`s
|
|
// immediately above the statement (if appropriate).
|
|
macros_at_scope: FnvHashMap<NodeId, Vec<Mark>>,
|
|
|
|
graph_root: Module<'a>,
|
|
|
|
prelude: Option<Module<'a>>,
|
|
|
|
trait_item_map: FnvHashMap<(Name, DefId), bool /* is static method? */>,
|
|
|
|
structs: FnvHashMap<DefId, Vec<Name>>,
|
|
|
|
// All imports known to succeed or fail.
|
|
determined_imports: Vec<&'a ImportDirective<'a>>,
|
|
|
|
// All non-determined imports.
|
|
indeterminate_imports: Vec<&'a ImportDirective<'a>>,
|
|
|
|
// The module that represents the current item scope.
|
|
current_module: Module<'a>,
|
|
|
|
// The current set of local scopes, for values.
|
|
// FIXME #4948: Reuse ribs to avoid allocation.
|
|
value_ribs: Vec<Rib<'a>>,
|
|
|
|
// The current set of local scopes, for types.
|
|
type_ribs: Vec<Rib<'a>>,
|
|
|
|
// The current set of local scopes, for labels.
|
|
label_ribs: Vec<Rib<'a>>,
|
|
|
|
// The trait that the current context can refer to.
|
|
current_trait_ref: Option<(DefId, TraitRef)>,
|
|
|
|
// The current self type if inside an impl (used for better errors).
|
|
current_self_type: Option<Ty>,
|
|
|
|
// The idents for the primitive types.
|
|
primitive_type_table: PrimitiveTypeTable,
|
|
|
|
pub def_map: DefMap,
|
|
pub freevars: FreevarMap,
|
|
freevars_seen: NodeMap<NodeMap<usize>>,
|
|
pub export_map: ExportMap,
|
|
pub trait_map: TraitMap,
|
|
|
|
// A map from nodes to modules, both normal (`mod`) modules and 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`.
|
|
module_map: NodeMap<Module<'a>>,
|
|
|
|
// Whether or not to print error messages. Can be set to true
|
|
// when getting additional info for error message suggestions,
|
|
// so as to avoid printing duplicate errors
|
|
emit_errors: bool,
|
|
|
|
pub make_glob_map: bool,
|
|
// Maps imports to the names of items actually imported (this actually maps
|
|
// all imports, but only glob imports are actually interesting).
|
|
pub glob_map: GlobMap,
|
|
|
|
used_imports: FnvHashSet<(NodeId, Namespace)>,
|
|
used_crates: FnvHashSet<CrateNum>,
|
|
pub maybe_unused_trait_imports: NodeSet,
|
|
|
|
privacy_errors: Vec<PrivacyError<'a>>,
|
|
ambiguity_errors: Vec<AmbiguityError<'a>>,
|
|
|
|
arenas: &'a ResolverArenas<'a>,
|
|
dummy_binding: &'a NameBinding<'a>,
|
|
new_import_semantics: bool, // true if `#![feature(item_like_imports)]`
|
|
|
|
macro_loader: &'a mut MacroLoader,
|
|
macro_names: FnvHashSet<Name>,
|
|
|
|
// Maps the `Mark` of an expansion to its containing module or block.
|
|
expansion_data: Vec<macros::ExpansionData>,
|
|
}
|
|
|
|
pub struct ResolverArenas<'a> {
|
|
modules: arena::TypedArena<ModuleS<'a>>,
|
|
local_modules: RefCell<Vec<Module<'a>>>,
|
|
name_bindings: arena::TypedArena<NameBinding<'a>>,
|
|
import_directives: arena::TypedArena<ImportDirective<'a>>,
|
|
name_resolutions: arena::TypedArena<RefCell<NameResolution<'a>>>,
|
|
}
|
|
|
|
impl<'a> ResolverArenas<'a> {
|
|
fn alloc_module(&'a self, module: ModuleS<'a>) -> Module<'a> {
|
|
let module = self.modules.alloc(module);
|
|
if module.def_id().map(|def_id| def_id.is_local()).unwrap_or(true) {
|
|
self.local_modules.borrow_mut().push(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.name_bindings.alloc(name_binding)
|
|
}
|
|
fn alloc_import_directive(&'a self, import_directive: ImportDirective<'a>)
|
|
-> &'a ImportDirective {
|
|
self.import_directives.alloc(import_directive)
|
|
}
|
|
fn alloc_name_resolution(&'a self) -> &'a RefCell<NameResolution<'a>> {
|
|
self.name_resolutions.alloc(Default::default())
|
|
}
|
|
}
|
|
|
|
impl<'a> ty::NodeIdTree for Resolver<'a> {
|
|
fn is_descendant_of(&self, mut node: NodeId, ancestor: NodeId) -> bool {
|
|
while node != ancestor {
|
|
node = match self.module_map[&node].parent() {
|
|
Some(parent) => parent.normal_ancestor_id.unwrap(),
|
|
None => return false,
|
|
}
|
|
}
|
|
true
|
|
}
|
|
}
|
|
|
|
impl<'a> hir::lowering::Resolver for Resolver<'a> {
|
|
fn resolve_generated_global_path(&mut self, path: &hir::Path, is_value: bool) -> Def {
|
|
let namespace = if is_value { ValueNS } else { TypeNS };
|
|
match self.resolve_crate_relative_path(path.span, &path.segments, namespace) {
|
|
Ok(binding) => binding.def(),
|
|
Err(true) => Def::Err,
|
|
Err(false) => {
|
|
let path_name = &format!("{}", path);
|
|
let error =
|
|
ResolutionError::UnresolvedName {
|
|
path: path_name,
|
|
message: "",
|
|
context: UnresolvedNameContext::Other,
|
|
is_static_method: false,
|
|
is_field: false,
|
|
def: Def::Err,
|
|
};
|
|
resolve_error(self, path.span, error);
|
|
Def::Err
|
|
}
|
|
}
|
|
}
|
|
|
|
fn get_resolution(&mut self, id: NodeId) -> Option<PathResolution> {
|
|
self.def_map.get(&id).cloned()
|
|
}
|
|
|
|
fn record_resolution(&mut self, id: NodeId, def: Def) {
|
|
self.def_map.insert(id, PathResolution::new(def));
|
|
}
|
|
|
|
fn definitions(&mut self) -> &mut Definitions {
|
|
&mut self.definitions
|
|
}
|
|
}
|
|
|
|
trait Named {
|
|
fn name(&self) -> Name;
|
|
}
|
|
|
|
impl Named for ast::PathSegment {
|
|
fn name(&self) -> Name {
|
|
self.identifier.name
|
|
}
|
|
}
|
|
|
|
impl Named for hir::PathSegment {
|
|
fn name(&self) -> Name {
|
|
self.name
|
|
}
|
|
}
|
|
|
|
impl<'a> Resolver<'a> {
|
|
pub fn new(session: &'a Session,
|
|
make_glob_map: MakeGlobMap,
|
|
macro_loader: &'a mut MacroLoader,
|
|
arenas: &'a ResolverArenas<'a>)
|
|
-> Resolver<'a> {
|
|
let root_def_id = DefId::local(CRATE_DEF_INDEX);
|
|
let graph_root =
|
|
ModuleS::new(NoParentLink, Some(Def::Mod(root_def_id)), Some(CRATE_NODE_ID));
|
|
let graph_root = arenas.alloc_module(graph_root);
|
|
let mut module_map = NodeMap();
|
|
module_map.insert(CRATE_NODE_ID, graph_root);
|
|
|
|
Resolver {
|
|
session: session,
|
|
|
|
definitions: Definitions::new(),
|
|
macros_at_scope: FnvHashMap(),
|
|
|
|
// The outermost module has def ID 0; this is not reflected in the
|
|
// AST.
|
|
graph_root: graph_root,
|
|
prelude: None,
|
|
|
|
trait_item_map: FnvHashMap(),
|
|
structs: FnvHashMap(),
|
|
|
|
determined_imports: Vec::new(),
|
|
indeterminate_imports: Vec::new(),
|
|
|
|
current_module: graph_root,
|
|
value_ribs: vec![Rib::new(ModuleRibKind(graph_root))],
|
|
type_ribs: vec![Rib::new(ModuleRibKind(graph_root))],
|
|
label_ribs: Vec::new(),
|
|
|
|
current_trait_ref: None,
|
|
current_self_type: None,
|
|
|
|
primitive_type_table: PrimitiveTypeTable::new(),
|
|
|
|
def_map: NodeMap(),
|
|
freevars: NodeMap(),
|
|
freevars_seen: NodeMap(),
|
|
export_map: NodeMap(),
|
|
trait_map: NodeMap(),
|
|
module_map: module_map,
|
|
|
|
emit_errors: true,
|
|
make_glob_map: make_glob_map == MakeGlobMap::Yes,
|
|
glob_map: NodeMap(),
|
|
|
|
used_imports: FnvHashSet(),
|
|
used_crates: FnvHashSet(),
|
|
maybe_unused_trait_imports: NodeSet(),
|
|
|
|
privacy_errors: Vec::new(),
|
|
ambiguity_errors: Vec::new(),
|
|
|
|
arenas: arenas,
|
|
dummy_binding: arenas.alloc_name_binding(NameBinding {
|
|
kind: NameBindingKind::Def(Def::Err),
|
|
span: DUMMY_SP,
|
|
vis: ty::Visibility::Public,
|
|
}),
|
|
new_import_semantics: session.features.borrow().item_like_imports,
|
|
|
|
macro_loader: macro_loader,
|
|
macro_names: FnvHashSet(),
|
|
expansion_data: vec![macros::ExpansionData::default()],
|
|
}
|
|
}
|
|
|
|
pub fn arenas() -> ResolverArenas<'a> {
|
|
ResolverArenas {
|
|
modules: arena::TypedArena::new(),
|
|
local_modules: RefCell::new(Vec::new()),
|
|
name_bindings: arena::TypedArena::new(),
|
|
import_directives: arena::TypedArena::new(),
|
|
name_resolutions: arena::TypedArena::new(),
|
|
}
|
|
}
|
|
|
|
/// Entry point to crate resolution.
|
|
pub fn resolve_crate(&mut self, krate: &Crate) {
|
|
self.current_module = self.graph_root;
|
|
visit::walk_crate(self, krate);
|
|
|
|
check_unused::check_crate(self, krate);
|
|
self.report_errors();
|
|
}
|
|
|
|
fn new_module(&self,
|
|
parent_link: ParentLink<'a>,
|
|
def: Option<Def>,
|
|
normal_ancestor_id: Option<NodeId>)
|
|
-> Module<'a> {
|
|
self.arenas.alloc_module(ModuleS::new(parent_link, def, normal_ancestor_id))
|
|
}
|
|
|
|
fn new_extern_crate_module(&self, parent_link: ParentLink<'a>, def: Def, local_node_id: NodeId)
|
|
-> Module<'a> {
|
|
let mut module = ModuleS::new(parent_link, Some(def), Some(local_node_id));
|
|
module.extern_crate_id = Some(local_node_id);
|
|
module.populated.set(false);
|
|
self.arenas.modules.alloc(module)
|
|
}
|
|
|
|
fn get_ribs<'b>(&'b mut self, ns: Namespace) -> &'b mut Vec<Rib<'a>> {
|
|
match ns { ValueNS => &mut self.value_ribs, TypeNS => &mut self.type_ribs }
|
|
}
|
|
|
|
fn record_use(&mut self, name: Name, ns: Namespace, binding: &'a NameBinding<'a>, span: Span)
|
|
-> bool /* true if an error was reported */ {
|
|
// track extern crates for unused_extern_crate lint
|
|
if let Some(DefId { krate, .. }) = binding.module().ok().and_then(ModuleS::def_id) {
|
|
self.used_crates.insert(krate);
|
|
}
|
|
|
|
match binding.kind {
|
|
NameBindingKind::Import { directive, binding, ref used } if !used.get() => {
|
|
used.set(true);
|
|
self.used_imports.insert((directive.id, ns));
|
|
self.add_to_glob_map(directive.id, name);
|
|
self.record_use(name, ns, binding, span)
|
|
}
|
|
NameBindingKind::Import { .. } => false,
|
|
NameBindingKind::Ambiguity { b1, b2 } => {
|
|
let ambiguity_error = AmbiguityError { span: span, name: name, b1: b1, b2: b2 };
|
|
self.ambiguity_errors.push(ambiguity_error);
|
|
true
|
|
}
|
|
_ => false
|
|
}
|
|
}
|
|
|
|
fn add_to_glob_map(&mut self, id: NodeId, name: Name) {
|
|
if self.make_glob_map {
|
|
self.glob_map.entry(id).or_insert_with(FnvHashSet).insert(name);
|
|
}
|
|
}
|
|
|
|
fn expect_module(&mut self, name: Name, binding: &'a NameBinding<'a>, span: Option<Span>)
|
|
-> ResolveResult<Module<'a>> {
|
|
match binding.module() {
|
|
Ok(module) => Success(module),
|
|
Err(true) => Failed(None),
|
|
Err(false) => {
|
|
let msg = format!("Not a module `{}`", name);
|
|
Failed(span.map(|span| (span, msg)))
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Resolves the given module path from the given root `search_module`.
|
|
fn resolve_module_path_from_root(&mut self,
|
|
mut search_module: Module<'a>,
|
|
module_path: &[Name],
|
|
index: usize,
|
|
span: Option<Span>)
|
|
-> ResolveResult<Module<'a>> {
|
|
fn search_parent_externals<'a>(this: &mut Resolver<'a>, needle: Name, module: Module<'a>)
|
|
-> Option<Module<'a>> {
|
|
match this.resolve_name_in_module(module, needle, TypeNS, false, None) {
|
|
Success(binding) if binding.is_extern_crate() => Some(module),
|
|
_ => match module.parent_link {
|
|
ModuleParentLink(ref parent, _) => {
|
|
search_parent_externals(this, needle, parent)
|
|
}
|
|
_ => None,
|
|
},
|
|
}
|
|
}
|
|
|
|
let mut index = index;
|
|
let module_path_len = module_path.len();
|
|
|
|
// Resolve the module part of the path. This does not involve looking
|
|
// upward though scope chains; we simply resolve names directly in
|
|
// modules as we go.
|
|
while index < module_path_len {
|
|
let name = module_path[index];
|
|
match self.resolve_name_in_module(search_module, name, TypeNS, false, span) {
|
|
Failed(_) => {
|
|
let segment_name = name.as_str();
|
|
let module_name = module_to_string(search_module);
|
|
let msg = if "???" == &module_name {
|
|
let current_module = self.current_module;
|
|
match search_parent_externals(self, name, current_module) {
|
|
Some(module) => {
|
|
let path_str = names_to_string(module_path);
|
|
let target_mod_str = module_to_string(&module);
|
|
let current_mod_str = module_to_string(current_module);
|
|
|
|
let prefix = if target_mod_str == current_mod_str {
|
|
"self::".to_string()
|
|
} else {
|
|
format!("{}::", target_mod_str)
|
|
};
|
|
|
|
format!("Did you mean `{}{}`?", prefix, path_str)
|
|
}
|
|
None => format!("Maybe a missing `extern crate {}`?", segment_name),
|
|
}
|
|
} else {
|
|
format!("Could not find `{}` in `{}`", segment_name, module_name)
|
|
};
|
|
|
|
return Failed(span.map(|span| (span, msg)));
|
|
}
|
|
Indeterminate => {
|
|
debug!("(resolving module path for import) module resolution is \
|
|
indeterminate: {}",
|
|
name);
|
|
return Indeterminate;
|
|
}
|
|
Success(binding) => {
|
|
// Check to see whether there are type bindings, and, if
|
|
// so, whether there is a module within.
|
|
match self.expect_module(name, binding, span) {
|
|
Success(module) => search_module = module,
|
|
result @ _ => return result,
|
|
}
|
|
}
|
|
}
|
|
|
|
index += 1;
|
|
}
|
|
|
|
return Success(search_module);
|
|
}
|
|
|
|
/// Attempts to resolve the module part of an import directive or path
|
|
/// rooted at the given module.
|
|
fn resolve_module_path(&mut self,
|
|
module_path: &[Name],
|
|
use_lexical_scope: UseLexicalScopeFlag,
|
|
span: Option<Span>)
|
|
-> ResolveResult<Module<'a>> {
|
|
if module_path.len() == 0 {
|
|
return Success(self.graph_root) // Use the crate root
|
|
}
|
|
|
|
debug!("(resolving module path for import) processing `{}` rooted at `{}`",
|
|
names_to_string(module_path),
|
|
module_to_string(self.current_module));
|
|
|
|
// Resolve the module prefix, if any.
|
|
let module_prefix_result = self.resolve_module_prefix(module_path, span);
|
|
|
|
let search_module;
|
|
let start_index;
|
|
match module_prefix_result {
|
|
Failed(err) => return Failed(err),
|
|
Indeterminate => {
|
|
debug!("(resolving module path for import) indeterminate; bailing");
|
|
return Indeterminate;
|
|
}
|
|
Success(NoPrefixFound) => {
|
|
// There was no prefix, so we're considering the first element
|
|
// of the path. How we handle this depends on whether we were
|
|
// instructed to use lexical scope or not.
|
|
match use_lexical_scope {
|
|
DontUseLexicalScope => {
|
|
// This is a crate-relative path. We will start the
|
|
// resolution process at index zero.
|
|
search_module = self.graph_root;
|
|
start_index = 0;
|
|
}
|
|
UseLexicalScope => {
|
|
// This is not a crate-relative path. We resolve the
|
|
// first component of the path in the current lexical
|
|
// scope and then proceed to resolve below that.
|
|
let ident = ast::Ident::with_empty_ctxt(module_path[0]);
|
|
let lexical_binding =
|
|
self.resolve_ident_in_lexical_scope(ident, TypeNS, span);
|
|
if let Some(binding) = lexical_binding.and_then(LexicalScopeBinding::item) {
|
|
match self.expect_module(ident.name, binding, span) {
|
|
Success(containing_module) => {
|
|
search_module = containing_module;
|
|
start_index = 1;
|
|
}
|
|
result @ _ => return result,
|
|
}
|
|
} else {
|
|
let msg =
|
|
format!("Use of undeclared type or module `{}`", ident.name);
|
|
return Failed(span.map(|span| (span, msg)));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Success(PrefixFound(ref containing_module, index)) => {
|
|
search_module = containing_module;
|
|
start_index = index;
|
|
}
|
|
}
|
|
|
|
self.resolve_module_path_from_root(search_module, module_path, start_index, span)
|
|
}
|
|
|
|
/// This resolves the identifier `ident` in the namespace `ns` in the current lexical scope.
|
|
/// More specifically, we proceed up the hierarchy of scopes and return the binding for
|
|
/// `ident` in the first scope that defines it (or None if no scopes define it).
|
|
///
|
|
/// A block's items are above its local variables in the scope hierarchy, regardless of where
|
|
/// the items are defined in the block. For example,
|
|
/// ```rust
|
|
/// fn f() {
|
|
/// g(); // Since there are no local variables in scope yet, this resolves to the item.
|
|
/// let g = || {};
|
|
/// fn g() {}
|
|
/// g(); // This resolves to the local variable `g` since it shadows the item.
|
|
/// }
|
|
/// ```
|
|
///
|
|
/// Invariant: This must only be called during main resolution, not during
|
|
/// import resolution.
|
|
fn resolve_ident_in_lexical_scope(&mut self,
|
|
mut ident: ast::Ident,
|
|
ns: Namespace,
|
|
record_used: Option<Span>)
|
|
-> Option<LexicalScopeBinding<'a>> {
|
|
if ns == TypeNS {
|
|
ident = ast::Ident::with_empty_ctxt(ident.name);
|
|
}
|
|
|
|
// Walk backwards up the ribs in scope.
|
|
for i in (0 .. self.get_ribs(ns).len()).rev() {
|
|
if let Some(def) = self.get_ribs(ns)[i].bindings.get(&ident).cloned() {
|
|
// The ident resolves to a type parameter or local variable.
|
|
return Some(LexicalScopeBinding::LocalDef(LocalDef {
|
|
ribs: Some((ns, i)),
|
|
def: def,
|
|
}));
|
|
}
|
|
|
|
if let ModuleRibKind(module) = self.get_ribs(ns)[i].kind {
|
|
let name = ident.name;
|
|
let item = self.resolve_name_in_module(module, name, ns, true, record_used);
|
|
if let Success(binding) = item {
|
|
// The ident resolves to an item.
|
|
return Some(LexicalScopeBinding::Item(binding));
|
|
}
|
|
|
|
// We can only see through anonymous modules
|
|
if module.def.is_some() {
|
|
return match self.prelude {
|
|
Some(prelude) if !module.no_implicit_prelude.get() => {
|
|
self.resolve_name_in_module(prelude, name, ns, false, None).success()
|
|
.map(LexicalScopeBinding::Item)
|
|
}
|
|
_ => None,
|
|
};
|
|
}
|
|
}
|
|
|
|
if let MacroDefinition(mac) = self.get_ribs(ns)[i].kind {
|
|
// If an invocation of this macro created `ident`, give up on `ident`
|
|
// and switch to `ident`'s source from the macro definition.
|
|
let (source_ctxt, source_macro) = ident.ctxt.source();
|
|
if source_macro == mac {
|
|
ident.ctxt = source_ctxt;
|
|
}
|
|
}
|
|
}
|
|
|
|
None
|
|
}
|
|
|
|
/// Resolves a "module prefix". A module prefix is one or both of (a) `self::`;
|
|
/// (b) some chain of `super::`.
|
|
/// grammar: (SELF MOD_SEP ) ? (SUPER MOD_SEP) *
|
|
fn resolve_module_prefix(&mut self, module_path: &[Name], span: Option<Span>)
|
|
-> ResolveResult<ModulePrefixResult<'a>> {
|
|
// Start at the current module if we see `self` or `super`, or at the
|
|
// top of the crate otherwise.
|
|
let mut i = match &*module_path[0].as_str() {
|
|
"self" => 1,
|
|
"super" => 0,
|
|
_ => return Success(NoPrefixFound),
|
|
};
|
|
|
|
let mut containing_module =
|
|
self.module_map[&self.current_module.normal_ancestor_id.unwrap()];
|
|
|
|
// Now loop through all the `super`s we find.
|
|
while i < module_path.len() && "super" == module_path[i].as_str() {
|
|
debug!("(resolving module prefix) resolving `super` at {}",
|
|
module_to_string(&containing_module));
|
|
if let Some(parent) = containing_module.parent() {
|
|
containing_module = self.module_map[&parent.normal_ancestor_id.unwrap()];
|
|
i += 1;
|
|
} else {
|
|
let msg = "There are too many initial `super`s.".into();
|
|
return Failed(span.map(|span| (span, msg)));
|
|
}
|
|
}
|
|
|
|
debug!("(resolving module prefix) finished resolving prefix at {}",
|
|
module_to_string(&containing_module));
|
|
|
|
return Success(PrefixFound(containing_module, i));
|
|
}
|
|
|
|
// AST resolution
|
|
//
|
|
// We maintain a list of value ribs and type ribs.
|
|
//
|
|
// Simultaneously, we keep track of the current position in the module
|
|
// graph in the `current_module` pointer. When we go to resolve a name in
|
|
// the value or type namespaces, we first look through all the ribs and
|
|
// then query the module graph. When we resolve a name in the module
|
|
// namespace, we can skip all the ribs (since nested modules are not
|
|
// allowed within blocks in Rust) and jump straight to the current module
|
|
// graph node.
|
|
//
|
|
// Named implementations are handled separately. When we find a method
|
|
// call, we consult the module node to find all of the implementations in
|
|
// scope. This information is lazily cached in the module node. We then
|
|
// generate a fake "implementation scope" containing all the
|
|
// implementations thus found, for compatibility with old resolve pass.
|
|
|
|
fn with_scope<F>(&mut self, id: NodeId, f: F)
|
|
where F: FnOnce(&mut Resolver)
|
|
{
|
|
let module = self.module_map.get(&id).cloned(); // clones a reference
|
|
if let Some(module) = module {
|
|
// Move down in the graph.
|
|
let orig_module = replace(&mut self.current_module, module);
|
|
self.value_ribs.push(Rib::new(ModuleRibKind(module)));
|
|
self.type_ribs.push(Rib::new(ModuleRibKind(module)));
|
|
|
|
f(self);
|
|
|
|
self.current_module = orig_module;
|
|
self.value_ribs.pop();
|
|
self.type_ribs.pop();
|
|
} else {
|
|
f(self);
|
|
}
|
|
}
|
|
|
|
/// Searches the current set of local scopes for labels.
|
|
/// Stops after meeting a closure.
|
|
fn search_label(&self, mut ident: ast::Ident) -> Option<Def> {
|
|
for rib in self.label_ribs.iter().rev() {
|
|
match rib.kind {
|
|
NormalRibKind => {
|
|
// Continue
|
|
}
|
|
MacroDefinition(mac) => {
|
|
// If an invocation of this macro created `ident`, give up on `ident`
|
|
// and switch to `ident`'s source from the macro definition.
|
|
let (source_ctxt, source_macro) = ident.ctxt.source();
|
|
if source_macro == mac {
|
|
ident.ctxt = source_ctxt;
|
|
}
|
|
}
|
|
_ => {
|
|
// Do not resolve labels across function boundary
|
|
return None;
|
|
}
|
|
}
|
|
let result = rib.bindings.get(&ident).cloned();
|
|
if result.is_some() {
|
|
return result;
|
|
}
|
|
}
|
|
None
|
|
}
|
|
|
|
fn resolve_item(&mut self, item: &Item) {
|
|
let name = item.ident.name;
|
|
|
|
debug!("(resolving item) resolving {}", name);
|
|
|
|
match item.node {
|
|
ItemKind::Enum(_, ref generics) |
|
|
ItemKind::Ty(_, ref generics) |
|
|
ItemKind::Struct(_, ref generics) |
|
|
ItemKind::Union(_, ref generics) |
|
|
ItemKind::Fn(.., ref generics, _) => {
|
|
self.with_type_parameter_rib(HasTypeParameters(generics, ItemRibKind),
|
|
|this| visit::walk_item(this, item));
|
|
}
|
|
|
|
ItemKind::DefaultImpl(_, ref trait_ref) => {
|
|
self.with_optional_trait_ref(Some(trait_ref), |_, _| {});
|
|
}
|
|
ItemKind::Impl(.., ref generics, ref opt_trait_ref, ref self_type, ref impl_items) =>
|
|
self.resolve_implementation(generics,
|
|
opt_trait_ref,
|
|
&self_type,
|
|
item.id,
|
|
impl_items),
|
|
|
|
ItemKind::Trait(_, ref generics, ref bounds, ref trait_items) => {
|
|
// Create a new rib for the trait-wide type parameters.
|
|
self.with_type_parameter_rib(HasTypeParameters(generics, ItemRibKind), |this| {
|
|
let local_def_id = this.definitions.local_def_id(item.id);
|
|
this.with_self_rib(Def::SelfTy(Some(local_def_id), None), |this| {
|
|
this.visit_generics(generics);
|
|
walk_list!(this, visit_ty_param_bound, bounds);
|
|
|
|
for trait_item in trait_items {
|
|
match trait_item.node {
|
|
TraitItemKind::Const(_, ref default) => {
|
|
// Only impose the restrictions of
|
|
// ConstRibKind if there's an actual constant
|
|
// expression in a provided default.
|
|
if default.is_some() {
|
|
this.with_constant_rib(|this| {
|
|
visit::walk_trait_item(this, trait_item)
|
|
});
|
|
} else {
|
|
visit::walk_trait_item(this, trait_item)
|
|
}
|
|
}
|
|
TraitItemKind::Method(ref sig, _) => {
|
|
let type_parameters =
|
|
HasTypeParameters(&sig.generics,
|
|
MethodRibKind(!sig.decl.has_self()));
|
|
this.with_type_parameter_rib(type_parameters, |this| {
|
|
visit::walk_trait_item(this, trait_item)
|
|
});
|
|
}
|
|
TraitItemKind::Type(..) => {
|
|
this.with_type_parameter_rib(NoTypeParameters, |this| {
|
|
visit::walk_trait_item(this, trait_item)
|
|
});
|
|
}
|
|
TraitItemKind::Macro(_) => panic!("unexpanded macro in resolve!"),
|
|
};
|
|
}
|
|
});
|
|
});
|
|
}
|
|
|
|
ItemKind::Mod(_) | ItemKind::ForeignMod(_) => {
|
|
self.with_scope(item.id, |this| {
|
|
visit::walk_item(this, item);
|
|
});
|
|
}
|
|
|
|
ItemKind::Const(..) | ItemKind::Static(..) => {
|
|
self.with_constant_rib(|this| {
|
|
visit::walk_item(this, item);
|
|
});
|
|
}
|
|
|
|
ItemKind::Use(ref view_path) => {
|
|
match view_path.node {
|
|
ast::ViewPathList(ref prefix, ref items) => {
|
|
// Resolve prefix of an import with empty braces (issue #28388)
|
|
if items.is_empty() && !prefix.segments.is_empty() {
|
|
match self.resolve_crate_relative_path(prefix.span,
|
|
&prefix.segments,
|
|
TypeNS) {
|
|
Ok(binding) => {
|
|
let def = binding.def();
|
|
self.record_def(item.id, PathResolution::new(def));
|
|
}
|
|
Err(true) => self.record_def(item.id, err_path_resolution()),
|
|
Err(false) => {
|
|
resolve_error(self,
|
|
prefix.span,
|
|
ResolutionError::FailedToResolve(
|
|
&path_names_to_string(prefix, 0)));
|
|
self.record_def(item.id, err_path_resolution());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
|
|
ItemKind::ExternCrate(_) => {
|
|
// do nothing, these are just around to be encoded
|
|
}
|
|
|
|
ItemKind::Mac(_) => panic!("unexpanded macro in resolve!"),
|
|
}
|
|
}
|
|
|
|
fn with_type_parameter_rib<'b, F>(&'b mut self, type_parameters: TypeParameters<'a, 'b>, f: F)
|
|
where F: FnOnce(&mut Resolver)
|
|
{
|
|
match type_parameters {
|
|
HasTypeParameters(generics, rib_kind) => {
|
|
let mut function_type_rib = Rib::new(rib_kind);
|
|
let mut seen_bindings = FnvHashMap();
|
|
for type_parameter in &generics.ty_params {
|
|
let name = type_parameter.ident.name;
|
|
debug!("with_type_parameter_rib: {}", type_parameter.id);
|
|
|
|
if seen_bindings.contains_key(&name) {
|
|
let span = seen_bindings.get(&name).unwrap();
|
|
resolve_error(self,
|
|
type_parameter.span,
|
|
ResolutionError::NameAlreadyUsedInTypeParameterList(name,
|
|
span));
|
|
}
|
|
seen_bindings.entry(name).or_insert(type_parameter.span);
|
|
|
|
// plain insert (no renaming)
|
|
let def_id = self.definitions.local_def_id(type_parameter.id);
|
|
let def = Def::TyParam(def_id);
|
|
function_type_rib.bindings.insert(ast::Ident::with_empty_ctxt(name), def);
|
|
self.record_def(type_parameter.id, PathResolution::new(def));
|
|
}
|
|
self.type_ribs.push(function_type_rib);
|
|
}
|
|
|
|
NoTypeParameters => {
|
|
// Nothing to do.
|
|
}
|
|
}
|
|
|
|
f(self);
|
|
|
|
if let HasTypeParameters(..) = type_parameters {
|
|
self.type_ribs.pop();
|
|
}
|
|
}
|
|
|
|
fn with_label_rib<F>(&mut self, f: F)
|
|
where F: FnOnce(&mut Resolver)
|
|
{
|
|
self.label_ribs.push(Rib::new(NormalRibKind));
|
|
f(self);
|
|
self.label_ribs.pop();
|
|
}
|
|
|
|
fn with_constant_rib<F>(&mut self, f: F)
|
|
where F: FnOnce(&mut Resolver)
|
|
{
|
|
self.value_ribs.push(Rib::new(ConstantItemRibKind));
|
|
self.type_ribs.push(Rib::new(ConstantItemRibKind));
|
|
f(self);
|
|
self.type_ribs.pop();
|
|
self.value_ribs.pop();
|
|
}
|
|
|
|
fn resolve_function(&mut self,
|
|
rib_kind: RibKind<'a>,
|
|
declaration: &FnDecl,
|
|
block: &Block) {
|
|
// Create a value rib for the function.
|
|
self.value_ribs.push(Rib::new(rib_kind));
|
|
|
|
// Create a label rib for the function.
|
|
self.label_ribs.push(Rib::new(rib_kind));
|
|
|
|
// Add each argument to the rib.
|
|
let mut bindings_list = FnvHashMap();
|
|
for argument in &declaration.inputs {
|
|
self.resolve_pattern(&argument.pat, PatternSource::FnParam, &mut bindings_list);
|
|
|
|
self.visit_ty(&argument.ty);
|
|
|
|
debug!("(resolving function) recorded argument");
|
|
}
|
|
visit::walk_fn_ret_ty(self, &declaration.output);
|
|
|
|
// Resolve the function body.
|
|
self.visit_block(block);
|
|
|
|
debug!("(resolving function) leaving function");
|
|
|
|
self.label_ribs.pop();
|
|
self.value_ribs.pop();
|
|
}
|
|
|
|
fn resolve_trait_reference(&mut self,
|
|
id: NodeId,
|
|
trait_path: &Path,
|
|
path_depth: usize)
|
|
-> Result<PathResolution, ()> {
|
|
self.resolve_path(id, trait_path, path_depth, TypeNS).and_then(|path_res| {
|
|
match path_res.base_def {
|
|
Def::Trait(_) => {
|
|
debug!("(resolving trait) found trait def: {:?}", path_res);
|
|
return Ok(path_res);
|
|
}
|
|
Def::Err => return Err(true),
|
|
_ => {}
|
|
}
|
|
|
|
let mut err = resolve_struct_error(self, trait_path.span, {
|
|
ResolutionError::IsNotATrait(&path_names_to_string(trait_path, path_depth))
|
|
});
|
|
|
|
// If it's a typedef, give a note
|
|
if let Def::TyAlias(..) = path_res.base_def {
|
|
err.note(&format!("type aliases cannot be used for traits"));
|
|
}
|
|
err.emit();
|
|
Err(true)
|
|
}).map_err(|error_reported| {
|
|
if error_reported { return }
|
|
|
|
// find possible candidates
|
|
let trait_name = trait_path.segments.last().unwrap().identifier.name;
|
|
let candidates =
|
|
self.lookup_candidates(
|
|
trait_name,
|
|
TypeNS,
|
|
|def| match def {
|
|
Def::Trait(_) => true,
|
|
_ => false,
|
|
},
|
|
);
|
|
|
|
// create error object
|
|
let name = &path_names_to_string(trait_path, path_depth);
|
|
let error =
|
|
ResolutionError::UndeclaredTraitName(
|
|
name,
|
|
candidates,
|
|
);
|
|
|
|
resolve_error(self, trait_path.span, error);
|
|
})
|
|
}
|
|
|
|
fn with_current_self_type<T, F>(&mut self, self_type: &Ty, f: F) -> T
|
|
where F: FnOnce(&mut Resolver) -> T
|
|
{
|
|
// Handle nested impls (inside fn bodies)
|
|
let previous_value = replace(&mut self.current_self_type, Some(self_type.clone()));
|
|
let result = f(self);
|
|
self.current_self_type = previous_value;
|
|
result
|
|
}
|
|
|
|
fn with_optional_trait_ref<T, F>(&mut self, opt_trait_ref: Option<&TraitRef>, f: F) -> T
|
|
where F: FnOnce(&mut Resolver, Option<DefId>) -> T
|
|
{
|
|
let mut new_val = None;
|
|
let mut new_id = None;
|
|
if let Some(trait_ref) = opt_trait_ref {
|
|
if let Ok(path_res) = self.resolve_trait_reference(trait_ref.ref_id,
|
|
&trait_ref.path,
|
|
0) {
|
|
assert!(path_res.depth == 0);
|
|
self.record_def(trait_ref.ref_id, path_res);
|
|
new_val = Some((path_res.base_def.def_id(), trait_ref.clone()));
|
|
new_id = Some(path_res.base_def.def_id());
|
|
} else {
|
|
self.record_def(trait_ref.ref_id, err_path_resolution());
|
|
}
|
|
visit::walk_trait_ref(self, trait_ref);
|
|
}
|
|
let original_trait_ref = replace(&mut self.current_trait_ref, new_val);
|
|
let result = f(self, new_id);
|
|
self.current_trait_ref = original_trait_ref;
|
|
result
|
|
}
|
|
|
|
fn with_self_rib<F>(&mut self, self_def: Def, f: F)
|
|
where F: FnOnce(&mut Resolver)
|
|
{
|
|
let mut self_type_rib = Rib::new(NormalRibKind);
|
|
|
|
// plain insert (no renaming, types are not currently hygienic....)
|
|
self_type_rib.bindings.insert(keywords::SelfType.ident(), self_def);
|
|
self.type_ribs.push(self_type_rib);
|
|
f(self);
|
|
self.type_ribs.pop();
|
|
}
|
|
|
|
fn resolve_implementation(&mut self,
|
|
generics: &Generics,
|
|
opt_trait_reference: &Option<TraitRef>,
|
|
self_type: &Ty,
|
|
item_id: NodeId,
|
|
impl_items: &[ImplItem]) {
|
|
// If applicable, create a rib for the type parameters.
|
|
self.with_type_parameter_rib(HasTypeParameters(generics, ItemRibKind), |this| {
|
|
// Resolve the type parameters.
|
|
this.visit_generics(generics);
|
|
|
|
// Resolve the trait reference, if necessary.
|
|
this.with_optional_trait_ref(opt_trait_reference.as_ref(), |this, trait_id| {
|
|
// Resolve the self type.
|
|
this.visit_ty(self_type);
|
|
|
|
let item_def_id = this.definitions.local_def_id(item_id);
|
|
this.with_self_rib(Def::SelfTy(trait_id, Some(item_def_id)), |this| {
|
|
this.with_current_self_type(self_type, |this| {
|
|
for impl_item in impl_items {
|
|
this.resolve_visibility(&impl_item.vis);
|
|
match impl_item.node {
|
|
ImplItemKind::Const(..) => {
|
|
// If this is a trait impl, ensure the const
|
|
// exists in trait
|
|
this.check_trait_item(impl_item.ident.name,
|
|
impl_item.span,
|
|
|n, s| ResolutionError::ConstNotMemberOfTrait(n, s));
|
|
visit::walk_impl_item(this, impl_item);
|
|
}
|
|
ImplItemKind::Method(ref sig, _) => {
|
|
// If this is a trait impl, ensure the method
|
|
// exists in trait
|
|
this.check_trait_item(impl_item.ident.name,
|
|
impl_item.span,
|
|
|n, s| ResolutionError::MethodNotMemberOfTrait(n, s));
|
|
|
|
// We also need a new scope for the method-
|
|
// specific type parameters.
|
|
let type_parameters =
|
|
HasTypeParameters(&sig.generics,
|
|
MethodRibKind(!sig.decl.has_self()));
|
|
this.with_type_parameter_rib(type_parameters, |this| {
|
|
visit::walk_impl_item(this, impl_item);
|
|
});
|
|
}
|
|
ImplItemKind::Type(ref ty) => {
|
|
// If this is a trait impl, ensure the type
|
|
// exists in trait
|
|
this.check_trait_item(impl_item.ident.name,
|
|
impl_item.span,
|
|
|n, s| ResolutionError::TypeNotMemberOfTrait(n, s));
|
|
|
|
this.visit_ty(ty);
|
|
}
|
|
ImplItemKind::Macro(_) => panic!("unexpanded macro in resolve!"),
|
|
}
|
|
}
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
fn check_trait_item<F>(&self, name: Name, span: Span, err: F)
|
|
where F: FnOnce(Name, &str) -> ResolutionError
|
|
{
|
|
// If there is a TraitRef in scope for an impl, then the method must be in the
|
|
// trait.
|
|
if let Some((did, ref trait_ref)) = self.current_trait_ref {
|
|
if !self.trait_item_map.contains_key(&(name, did)) {
|
|
let path_str = path_names_to_string(&trait_ref.path, 0);
|
|
resolve_error(self, span, err(name, &path_str));
|
|
}
|
|
}
|
|
}
|
|
|
|
fn resolve_local(&mut self, local: &Local) {
|
|
// Resolve the type.
|
|
walk_list!(self, visit_ty, &local.ty);
|
|
|
|
// Resolve the initializer.
|
|
walk_list!(self, visit_expr, &local.init);
|
|
|
|
// Resolve the pattern.
|
|
self.resolve_pattern(&local.pat, PatternSource::Let, &mut FnvHashMap());
|
|
}
|
|
|
|
// build a map from pattern identifiers to binding-info's.
|
|
// this is done hygienically. This could arise for a macro
|
|
// that expands into an or-pattern where one 'x' was from the
|
|
// user and one 'x' came from the macro.
|
|
fn binding_mode_map(&mut self, pat: &Pat) -> BindingMap {
|
|
let mut binding_map = FnvHashMap();
|
|
|
|
pat.walk(&mut |pat| {
|
|
if let PatKind::Ident(binding_mode, ident, ref sub_pat) = pat.node {
|
|
if sub_pat.is_some() || match self.def_map.get(&pat.id) {
|
|
Some(&PathResolution { base_def: Def::Local(..), .. }) => true,
|
|
_ => false,
|
|
} {
|
|
let binding_info = BindingInfo { span: ident.span, binding_mode: binding_mode };
|
|
binding_map.insert(ident.node, binding_info);
|
|
}
|
|
}
|
|
true
|
|
});
|
|
|
|
binding_map
|
|
}
|
|
|
|
// check that all of the arms in an or-pattern have exactly the
|
|
// same set of bindings, with the same binding modes for each.
|
|
fn check_consistent_bindings(&mut self, arm: &Arm) {
|
|
if arm.pats.is_empty() {
|
|
return;
|
|
}
|
|
let map_0 = self.binding_mode_map(&arm.pats[0]);
|
|
for (i, p) in arm.pats.iter().enumerate() {
|
|
let map_i = self.binding_mode_map(&p);
|
|
|
|
for (&key, &binding_0) in &map_0 {
|
|
match map_i.get(&key) {
|
|
None => {
|
|
let error = ResolutionError::VariableNotBoundInPattern(key.name, 1, i + 1);
|
|
resolve_error(self, p.span, error);
|
|
}
|
|
Some(binding_i) => {
|
|
if binding_0.binding_mode != binding_i.binding_mode {
|
|
resolve_error(self,
|
|
binding_i.span,
|
|
ResolutionError::VariableBoundWithDifferentMode(
|
|
key.name,
|
|
i + 1,
|
|
binding_0.span));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for (&key, &binding) in &map_i {
|
|
if !map_0.contains_key(&key) {
|
|
resolve_error(self,
|
|
binding.span,
|
|
ResolutionError::VariableNotBoundInPattern(key.name, i + 1, 1));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn resolve_arm(&mut self, arm: &Arm) {
|
|
self.value_ribs.push(Rib::new(NormalRibKind));
|
|
|
|
let mut bindings_list = FnvHashMap();
|
|
for pattern in &arm.pats {
|
|
self.resolve_pattern(&pattern, PatternSource::Match, &mut bindings_list);
|
|
}
|
|
|
|
// This has to happen *after* we determine which
|
|
// pat_idents are variants
|
|
self.check_consistent_bindings(arm);
|
|
|
|
walk_list!(self, visit_expr, &arm.guard);
|
|
self.visit_expr(&arm.body);
|
|
|
|
self.value_ribs.pop();
|
|
}
|
|
|
|
fn resolve_block(&mut self, block: &Block) {
|
|
debug!("(resolving block) entering block");
|
|
// Move down in the graph, if there's an anonymous module rooted here.
|
|
let orig_module = self.current_module;
|
|
let anonymous_module = self.module_map.get(&block.id).cloned(); // clones a reference
|
|
|
|
let mut num_macro_definition_ribs = 0;
|
|
if let Some(anonymous_module) = anonymous_module {
|
|
debug!("(resolving block) found anonymous module, moving down");
|
|
self.value_ribs.push(Rib::new(ModuleRibKind(anonymous_module)));
|
|
self.type_ribs.push(Rib::new(ModuleRibKind(anonymous_module)));
|
|
self.current_module = anonymous_module;
|
|
} else {
|
|
self.value_ribs.push(Rib::new(NormalRibKind));
|
|
}
|
|
|
|
// Descend into the block.
|
|
for stmt in &block.stmts {
|
|
if let Some(marks) = self.macros_at_scope.remove(&stmt.id) {
|
|
num_macro_definition_ribs += marks.len() as u32;
|
|
for mark in marks {
|
|
self.value_ribs.push(Rib::new(MacroDefinition(mark)));
|
|
self.label_ribs.push(Rib::new(MacroDefinition(mark)));
|
|
}
|
|
}
|
|
|
|
self.visit_stmt(stmt);
|
|
}
|
|
|
|
// Move back up.
|
|
self.current_module = orig_module;
|
|
for _ in 0 .. num_macro_definition_ribs {
|
|
self.value_ribs.pop();
|
|
self.label_ribs.pop();
|
|
}
|
|
self.value_ribs.pop();
|
|
if let Some(_) = anonymous_module {
|
|
self.type_ribs.pop();
|
|
}
|
|
debug!("(resolving block) leaving block");
|
|
}
|
|
|
|
fn resolve_type(&mut self, ty: &Ty) {
|
|
match ty.node {
|
|
TyKind::Path(ref maybe_qself, ref path) => {
|
|
// This is a path in the type namespace. Walk through scopes
|
|
// looking for it.
|
|
if let Some(def) = self.resolve_possibly_assoc_item(ty.id, maybe_qself.as_ref(),
|
|
path, TypeNS) {
|
|
match def.base_def {
|
|
Def::Mod(..) if def.depth == 0 => {
|
|
self.session.span_err(path.span, "expected type, found module");
|
|
self.record_def(ty.id, err_path_resolution());
|
|
}
|
|
_ => {
|
|
// Write the result into the def map.
|
|
debug!("(resolving type) writing resolution for `{}` (id {}) = {:?}",
|
|
path_names_to_string(path, 0), ty.id, def);
|
|
self.record_def(ty.id, def);
|
|
}
|
|
}
|
|
} else {
|
|
self.record_def(ty.id, err_path_resolution());
|
|
|
|
// Keep reporting some errors even if they're ignored above.
|
|
if let Err(true) = self.resolve_path(ty.id, path, 0, TypeNS) {
|
|
// `resolve_path` already reported the error
|
|
} else {
|
|
let kind = if maybe_qself.is_some() {
|
|
"associated type"
|
|
} else {
|
|
"type name"
|
|
};
|
|
|
|
let is_invalid_self_type_name = path.segments.len() > 0 &&
|
|
maybe_qself.is_none() &&
|
|
path.segments[0].identifier.name ==
|
|
keywords::SelfType.name();
|
|
if is_invalid_self_type_name {
|
|
resolve_error(self,
|
|
ty.span,
|
|
ResolutionError::SelfUsedOutsideImplOrTrait);
|
|
} else {
|
|
let segment = path.segments.last();
|
|
let segment = segment.expect("missing name in path");
|
|
let type_name = segment.identifier.name;
|
|
|
|
let candidates =
|
|
self.lookup_candidates(
|
|
type_name,
|
|
TypeNS,
|
|
|def| match def {
|
|
Def::Trait(_) |
|
|
Def::Enum(_) |
|
|
Def::Struct(_) |
|
|
Def::Union(_) |
|
|
Def::TyAlias(_) => true,
|
|
_ => false,
|
|
},
|
|
);
|
|
|
|
// create error object
|
|
let name = &path_names_to_string(path, 0);
|
|
let error =
|
|
ResolutionError::UseOfUndeclared(
|
|
kind,
|
|
name,
|
|
candidates,
|
|
);
|
|
|
|
resolve_error(self, ty.span, error);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
// Resolve embedded types.
|
|
visit::walk_ty(self, ty);
|
|
}
|
|
|
|
fn fresh_binding(&mut self,
|
|
ident: &ast::SpannedIdent,
|
|
pat_id: NodeId,
|
|
outer_pat_id: NodeId,
|
|
pat_src: PatternSource,
|
|
bindings: &mut FnvHashMap<ast::Ident, NodeId>)
|
|
-> PathResolution {
|
|
// Add the binding to the local ribs, if it
|
|
// doesn't already exist in the bindings map. (We
|
|
// must not add it if it's in the bindings map
|
|
// because that breaks the assumptions later
|
|
// passes make about or-patterns.)
|
|
let mut def = Def::Local(self.definitions.local_def_id(pat_id));
|
|
match bindings.get(&ident.node).cloned() {
|
|
Some(id) if id == outer_pat_id => {
|
|
// `Variant(a, a)`, error
|
|
resolve_error(
|
|
self,
|
|
ident.span,
|
|
ResolutionError::IdentifierBoundMoreThanOnceInSamePattern(
|
|
&ident.node.name.as_str())
|
|
);
|
|
}
|
|
Some(..) if pat_src == PatternSource::FnParam => {
|
|
// `fn f(a: u8, a: u8)`, error
|
|
resolve_error(
|
|
self,
|
|
ident.span,
|
|
ResolutionError::IdentifierBoundMoreThanOnceInParameterList(
|
|
&ident.node.name.as_str())
|
|
);
|
|
}
|
|
Some(..) if pat_src == PatternSource::Match => {
|
|
// `Variant1(a) | Variant2(a)`, ok
|
|
// Reuse definition from the first `a`.
|
|
def = self.value_ribs.last_mut().unwrap().bindings[&ident.node];
|
|
}
|
|
Some(..) => {
|
|
span_bug!(ident.span, "two bindings with the same name from \
|
|
unexpected pattern source {:?}", pat_src);
|
|
}
|
|
None => {
|
|
// A completely fresh binding, add to the lists if it's valid.
|
|
if ident.node.name != keywords::Invalid.name() {
|
|
bindings.insert(ident.node, outer_pat_id);
|
|
self.value_ribs.last_mut().unwrap().bindings.insert(ident.node, def);
|
|
}
|
|
}
|
|
}
|
|
|
|
PathResolution::new(def)
|
|
}
|
|
|
|
fn resolve_pattern_path<ExpectedFn>(&mut self,
|
|
pat_id: NodeId,
|
|
qself: Option<&QSelf>,
|
|
path: &Path,
|
|
namespace: Namespace,
|
|
expected_fn: ExpectedFn,
|
|
expected_what: &str)
|
|
where ExpectedFn: FnOnce(Def) -> bool
|
|
{
|
|
let resolution = if let Some(resolution) = self.resolve_possibly_assoc_item(pat_id,
|
|
qself, path, namespace) {
|
|
if resolution.depth == 0 {
|
|
if expected_fn(resolution.base_def) || resolution.base_def == Def::Err {
|
|
resolution
|
|
} else {
|
|
resolve_error(
|
|
self,
|
|
path.span,
|
|
ResolutionError::PatPathUnexpected(expected_what,
|
|
resolution.kind_name(), path)
|
|
);
|
|
err_path_resolution()
|
|
}
|
|
} else {
|
|
// Not fully resolved associated item `T::A::B` or `<T as Tr>::A::B`
|
|
// or `<T>::A::B`. If `B` should be resolved in value namespace then
|
|
// it needs to be added to the trait map.
|
|
if namespace == ValueNS {
|
|
let item_name = path.segments.last().unwrap().identifier.name;
|
|
let traits = self.get_traits_containing_item(item_name);
|
|
self.trait_map.insert(pat_id, traits);
|
|
}
|
|
resolution
|
|
}
|
|
} else {
|
|
if let Err(false) = self.resolve_path(pat_id, path, 0, namespace) {
|
|
resolve_error(
|
|
self,
|
|
path.span,
|
|
ResolutionError::PatPathUnresolved(expected_what, path)
|
|
);
|
|
}
|
|
err_path_resolution()
|
|
};
|
|
|
|
self.record_def(pat_id, resolution);
|
|
}
|
|
|
|
fn resolve_pattern(&mut self,
|
|
pat: &Pat,
|
|
pat_src: PatternSource,
|
|
// Maps idents to the node ID for the
|
|
// outermost pattern that binds them.
|
|
bindings: &mut FnvHashMap<ast::Ident, NodeId>) {
|
|
// Visit all direct subpatterns of this pattern.
|
|
let outer_pat_id = pat.id;
|
|
pat.walk(&mut |pat| {
|
|
match pat.node {
|
|
PatKind::Ident(bmode, ref ident, ref opt_pat) => {
|
|
// First try to resolve the identifier as some existing
|
|
// entity, then fall back to a fresh binding.
|
|
let binding = self.resolve_ident_in_lexical_scope(ident.node, ValueNS, None)
|
|
.and_then(LexicalScopeBinding::item);
|
|
let resolution = binding.map(NameBinding::def).and_then(|def| {
|
|
let always_binding = !pat_src.is_refutable() || opt_pat.is_some() ||
|
|
bmode != BindingMode::ByValue(Mutability::Immutable);
|
|
match def {
|
|
Def::Struct(..) | Def::Variant(..) |
|
|
Def::Const(..) | Def::AssociatedConst(..) if !always_binding => {
|
|
// A constant, unit variant, etc pattern.
|
|
let name = ident.node.name;
|
|
self.record_use(name, ValueNS, binding.unwrap(), ident.span);
|
|
Some(PathResolution::new(def))
|
|
}
|
|
Def::Struct(..) | Def::Variant(..) |
|
|
Def::Const(..) | Def::AssociatedConst(..) | Def::Static(..) => {
|
|
// A fresh binding that shadows something unacceptable.
|
|
resolve_error(
|
|
self,
|
|
ident.span,
|
|
ResolutionError::BindingShadowsSomethingUnacceptable(
|
|
pat_src.descr(), ident.node.name, binding.unwrap())
|
|
);
|
|
None
|
|
}
|
|
Def::Local(..) | Def::Upvar(..) | Def::Fn(..) | Def::Err => {
|
|
// These entities are explicitly allowed
|
|
// to be shadowed by fresh bindings.
|
|
None
|
|
}
|
|
def => {
|
|
span_bug!(ident.span, "unexpected definition for an \
|
|
identifier in pattern {:?}", def);
|
|
}
|
|
}
|
|
}).unwrap_or_else(|| {
|
|
self.fresh_binding(ident, pat.id, outer_pat_id, pat_src, bindings)
|
|
});
|
|
|
|
self.record_def(pat.id, resolution);
|
|
}
|
|
|
|
PatKind::TupleStruct(ref path, ..) => {
|
|
self.resolve_pattern_path(pat.id, None, path, ValueNS, |def| {
|
|
match def {
|
|
Def::Struct(..) | Def::Variant(..) => true,
|
|
_ => false,
|
|
}
|
|
}, "variant or struct");
|
|
}
|
|
|
|
PatKind::Path(ref qself, ref path) => {
|
|
self.resolve_pattern_path(pat.id, qself.as_ref(), path, ValueNS, |def| {
|
|
match def {
|
|
Def::Struct(..) | Def::Variant(..) |
|
|
Def::Const(..) | Def::AssociatedConst(..) => true,
|
|
_ => false,
|
|
}
|
|
}, "variant, struct or constant");
|
|
}
|
|
|
|
PatKind::Struct(ref path, ..) => {
|
|
self.resolve_pattern_path(pat.id, None, path, TypeNS, |def| {
|
|
match def {
|
|
Def::Struct(..) | Def::Union(..) | Def::Variant(..) |
|
|
Def::TyAlias(..) | Def::AssociatedTy(..) => true,
|
|
_ => false,
|
|
}
|
|
}, "variant, struct or type alias");
|
|
}
|
|
|
|
_ => {}
|
|
}
|
|
true
|
|
});
|
|
|
|
visit::walk_pat(self, pat);
|
|
}
|
|
|
|
/// Handles paths that may refer to associated items
|
|
fn resolve_possibly_assoc_item(&mut self,
|
|
id: NodeId,
|
|
maybe_qself: Option<&QSelf>,
|
|
path: &Path,
|
|
namespace: Namespace)
|
|
-> Option<PathResolution> {
|
|
let max_assoc_types;
|
|
|
|
match maybe_qself {
|
|
Some(qself) => {
|
|
if qself.position == 0 {
|
|
// FIXME: Create some fake resolution that can't possibly be a type.
|
|
return Some(PathResolution {
|
|
base_def: Def::Mod(self.definitions.local_def_id(ast::CRATE_NODE_ID)),
|
|
depth: path.segments.len(),
|
|
});
|
|
}
|
|
max_assoc_types = path.segments.len() - qself.position;
|
|
// Make sure the trait is valid.
|
|
let _ = self.resolve_trait_reference(id, path, max_assoc_types);
|
|
}
|
|
None => {
|
|
max_assoc_types = path.segments.len();
|
|
}
|
|
}
|
|
|
|
let mut resolution = self.with_no_errors(|this| {
|
|
this.resolve_path(id, path, 0, namespace).ok()
|
|
});
|
|
for depth in 1..max_assoc_types {
|
|
if resolution.is_some() {
|
|
break;
|
|
}
|
|
self.with_no_errors(|this| {
|
|
let partial_resolution = this.resolve_path(id, path, depth, TypeNS).ok();
|
|
if let Some(Def::Mod(..)) = partial_resolution.map(|r| r.base_def) {
|
|
// Modules cannot have associated items
|
|
} else {
|
|
resolution = partial_resolution;
|
|
}
|
|
});
|
|
}
|
|
resolution
|
|
}
|
|
|
|
/// Skips `path_depth` trailing segments, which is also reflected in the
|
|
/// returned value. See `hir::def::PathResolution` for more info.
|
|
fn resolve_path(&mut self, id: NodeId, path: &Path, path_depth: usize, namespace: Namespace)
|
|
-> Result<PathResolution, bool /* true if an error was reported */ > {
|
|
debug!("resolve_path(id={:?} path={:?}, path_depth={:?})", id, path, path_depth);
|
|
|
|
let span = path.span;
|
|
let segments = &path.segments[..path.segments.len() - path_depth];
|
|
|
|
let mk_res = |def| PathResolution { base_def: def, depth: path_depth };
|
|
|
|
if path.global {
|
|
let binding = self.resolve_crate_relative_path(span, segments, namespace);
|
|
return binding.map(|binding| mk_res(binding.def()));
|
|
}
|
|
|
|
// Try to find a path to an item in a module.
|
|
let last_ident = segments.last().unwrap().identifier;
|
|
// Resolve a single identifier with fallback to primitive types
|
|
let resolve_identifier_with_fallback = |this: &mut Self, record_used| {
|
|
let def = this.resolve_identifier(last_ident, namespace, record_used);
|
|
match def {
|
|
None | Some(LocalDef{def: Def::Mod(..), ..}) if namespace == TypeNS =>
|
|
this.primitive_type_table
|
|
.primitive_types
|
|
.get(&last_ident.name)
|
|
.map_or(def, |prim_ty| Some(LocalDef::from_def(Def::PrimTy(*prim_ty)))),
|
|
_ => def
|
|
}
|
|
};
|
|
|
|
if segments.len() == 1 {
|
|
// In `a(::assoc_item)*` `a` cannot be a module. If `a` does resolve to a module we
|
|
// don't report an error right away, but try to fallback to a primitive type.
|
|
// So, we are still able to successfully resolve something like
|
|
//
|
|
// use std::u8; // bring module u8 in scope
|
|
// fn f() -> u8 { // OK, resolves to primitive u8, not to std::u8
|
|
// u8::max_value() // OK, resolves to associated function <u8>::max_value,
|
|
// // not to non-existent std::u8::max_value
|
|
// }
|
|
//
|
|
// Such behavior is required for backward compatibility.
|
|
// The same fallback is used when `a` resolves to nothing.
|
|
let def = resolve_identifier_with_fallback(self, Some(span)).ok_or(false);
|
|
return def.and_then(|def| self.adjust_local_def(def, span).ok_or(true)).map(mk_res);
|
|
}
|
|
|
|
let unqualified_def = resolve_identifier_with_fallback(self, None);
|
|
let qualified_binding = self.resolve_module_relative_path(span, segments, namespace);
|
|
match (qualified_binding, unqualified_def) {
|
|
(Ok(binding), Some(ref ud)) if binding.def() == ud.def => {
|
|
self.session
|
|
.add_lint(lint::builtin::UNUSED_QUALIFICATIONS,
|
|
id,
|
|
span,
|
|
"unnecessary qualification".to_string());
|
|
}
|
|
_ => {}
|
|
}
|
|
|
|
qualified_binding.map(|binding| mk_res(binding.def()))
|
|
}
|
|
|
|
// Resolve a single identifier
|
|
fn resolve_identifier(&mut self,
|
|
identifier: ast::Ident,
|
|
namespace: Namespace,
|
|
record_used: Option<Span>)
|
|
-> Option<LocalDef> {
|
|
if identifier.name == keywords::Invalid.name() {
|
|
return None;
|
|
}
|
|
|
|
self.resolve_ident_in_lexical_scope(identifier, namespace, record_used)
|
|
.map(LexicalScopeBinding::local_def)
|
|
}
|
|
|
|
// Resolve a local definition, potentially adjusting for closures.
|
|
fn adjust_local_def(&mut self, local_def: LocalDef, span: Span) -> Option<Def> {
|
|
let ribs = match local_def.ribs {
|
|
Some((TypeNS, i)) => &self.type_ribs[i + 1..],
|
|
Some((ValueNS, i)) => &self.value_ribs[i + 1..],
|
|
_ => &[] as &[_],
|
|
};
|
|
let mut def = local_def.def;
|
|
match def {
|
|
Def::Upvar(..) => {
|
|
span_bug!(span, "unexpected {:?} in bindings", def)
|
|
}
|
|
Def::Local(def_id) => {
|
|
for rib in ribs {
|
|
match rib.kind {
|
|
NormalRibKind | ModuleRibKind(..) | MacroDefinition(..) => {
|
|
// Nothing to do. Continue.
|
|
}
|
|
ClosureRibKind(function_id) => {
|
|
let prev_def = def;
|
|
let node_id = self.definitions.as_local_node_id(def_id).unwrap();
|
|
|
|
let seen = self.freevars_seen
|
|
.entry(function_id)
|
|
.or_insert_with(|| NodeMap());
|
|
if let Some(&index) = seen.get(&node_id) {
|
|
def = Def::Upvar(def_id, index, function_id);
|
|
continue;
|
|
}
|
|
let vec = self.freevars
|
|
.entry(function_id)
|
|
.or_insert_with(|| vec![]);
|
|
let depth = vec.len();
|
|
vec.push(Freevar {
|
|
def: prev_def,
|
|
span: span,
|
|
});
|
|
|
|
def = Def::Upvar(def_id, depth, function_id);
|
|
seen.insert(node_id, depth);
|
|
}
|
|
ItemRibKind | MethodRibKind(_) => {
|
|
// This was an attempt to access an upvar inside a
|
|
// named function item. This is not allowed, so we
|
|
// report an error.
|
|
resolve_error(self,
|
|
span,
|
|
ResolutionError::CannotCaptureDynamicEnvironmentInFnItem);
|
|
return None;
|
|
}
|
|
ConstantItemRibKind => {
|
|
// Still doesn't deal with upvars
|
|
resolve_error(self,
|
|
span,
|
|
ResolutionError::AttemptToUseNonConstantValueInConstant);
|
|
return None;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Def::TyParam(..) | Def::SelfTy(..) => {
|
|
for rib in ribs {
|
|
match rib.kind {
|
|
NormalRibKind | MethodRibKind(_) | ClosureRibKind(..) |
|
|
ModuleRibKind(..) | MacroDefinition(..) => {
|
|
// Nothing to do. Continue.
|
|
}
|
|
ItemRibKind => {
|
|
// This was an attempt to use a type parameter outside
|
|
// its scope.
|
|
|
|
resolve_error(self,
|
|
span,
|
|
ResolutionError::TypeParametersFromOuterFunction);
|
|
return None;
|
|
}
|
|
ConstantItemRibKind => {
|
|
// see #9186
|
|
resolve_error(self, span, ResolutionError::OuterTypeParameterContext);
|
|
return None;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
return Some(def);
|
|
}
|
|
|
|
// resolve a "module-relative" path, e.g. a::b::c
|
|
fn resolve_module_relative_path(&mut self,
|
|
span: Span,
|
|
segments: &[ast::PathSegment],
|
|
namespace: Namespace)
|
|
-> Result<&'a NameBinding<'a>,
|
|
bool /* true if an error was reported */> {
|
|
let module_path = segments.split_last()
|
|
.unwrap()
|
|
.1
|
|
.iter()
|
|
.map(|ps| ps.identifier.name)
|
|
.collect::<Vec<_>>();
|
|
|
|
let containing_module;
|
|
match self.resolve_module_path(&module_path, UseLexicalScope, Some(span)) {
|
|
Failed(err) => {
|
|
if let Some((span, msg)) = err {
|
|
resolve_error(self, span, ResolutionError::FailedToResolve(&msg));
|
|
}
|
|
return Err(true);
|
|
}
|
|
Indeterminate => return Err(false),
|
|
Success(resulting_module) => {
|
|
containing_module = resulting_module;
|
|
}
|
|
}
|
|
|
|
let name = segments.last().unwrap().identifier.name;
|
|
let result =
|
|
self.resolve_name_in_module(containing_module, name, namespace, false, Some(span));
|
|
result.success().ok_or(false)
|
|
}
|
|
|
|
/// Invariant: This must be called only during main resolution, not during
|
|
/// import resolution.
|
|
fn resolve_crate_relative_path<T>(&mut self, span: Span, segments: &[T], namespace: Namespace)
|
|
-> Result<&'a NameBinding<'a>,
|
|
bool /* true if an error was reported */>
|
|
where T: Named,
|
|
{
|
|
let module_path = segments.split_last().unwrap().1.iter().map(T::name).collect::<Vec<_>>();
|
|
let root_module = self.graph_root;
|
|
|
|
let containing_module;
|
|
match self.resolve_module_path_from_root(root_module, &module_path, 0, Some(span)) {
|
|
Failed(err) => {
|
|
if let Some((span, msg)) = err {
|
|
resolve_error(self, span, ResolutionError::FailedToResolve(&msg));
|
|
}
|
|
return Err(true);
|
|
}
|
|
|
|
Indeterminate => return Err(false),
|
|
|
|
Success(resulting_module) => {
|
|
containing_module = resulting_module;
|
|
}
|
|
}
|
|
|
|
let name = segments.last().unwrap().name();
|
|
let result =
|
|
self.resolve_name_in_module(containing_module, name, namespace, false, Some(span));
|
|
result.success().ok_or(false)
|
|
}
|
|
|
|
fn with_no_errors<T, F>(&mut self, f: F) -> T
|
|
where F: FnOnce(&mut Resolver) -> T
|
|
{
|
|
self.emit_errors = false;
|
|
let rs = f(self);
|
|
self.emit_errors = true;
|
|
rs
|
|
}
|
|
|
|
// Calls `f` with a `Resolver` whose current lexical scope is `module`'s lexical scope,
|
|
// i.e. the module's items and the prelude (unless the module is `#[no_implicit_prelude]`).
|
|
// FIXME #34673: This needs testing.
|
|
pub fn with_module_lexical_scope<T, F>(&mut self, module: Module<'a>, f: F) -> T
|
|
where F: FnOnce(&mut Resolver<'a>) -> T,
|
|
{
|
|
self.with_empty_ribs(|this| {
|
|
this.value_ribs.push(Rib::new(ModuleRibKind(module)));
|
|
this.type_ribs.push(Rib::new(ModuleRibKind(module)));
|
|
f(this)
|
|
})
|
|
}
|
|
|
|
fn with_empty_ribs<T, F>(&mut self, f: F) -> T
|
|
where F: FnOnce(&mut Resolver<'a>) -> T,
|
|
{
|
|
let value_ribs = replace(&mut self.value_ribs, Vec::new());
|
|
let type_ribs = replace(&mut self.type_ribs, Vec::new());
|
|
let label_ribs = replace(&mut self.label_ribs, Vec::new());
|
|
|
|
let result = f(self);
|
|
self.value_ribs = value_ribs;
|
|
self.type_ribs = type_ribs;
|
|
self.label_ribs = label_ribs;
|
|
result
|
|
}
|
|
|
|
fn find_fallback_in_self_type(&mut self, name: Name) -> FallbackSuggestion {
|
|
fn extract_node_id(t: &Ty) -> Option<NodeId> {
|
|
match t.node {
|
|
TyKind::Path(None, _) => Some(t.id),
|
|
TyKind::Rptr(_, ref mut_ty) => extract_node_id(&mut_ty.ty),
|
|
// This doesn't handle the remaining `Ty` variants as they are not
|
|
// that commonly the self_type, it might be interesting to provide
|
|
// support for those in future.
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
if let Some(node_id) = self.current_self_type.as_ref().and_then(extract_node_id) {
|
|
// Look for a field with the same name in the current self_type.
|
|
if let Some(resolution) = self.def_map.get(&node_id) {
|
|
match resolution.base_def {
|
|
Def::Enum(did) | Def::TyAlias(did) | Def::Union(did) |
|
|
Def::Struct(did) | Def::Variant(_, did) if resolution.depth == 0 => {
|
|
if let Some(fields) = self.structs.get(&did) {
|
|
if fields.iter().any(|&field_name| name == field_name) {
|
|
return Field;
|
|
}
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Look for a method in the current trait.
|
|
if let Some((trait_did, ref trait_ref)) = self.current_trait_ref {
|
|
if let Some(&is_static_method) = self.trait_item_map.get(&(name, trait_did)) {
|
|
if is_static_method {
|
|
return TraitMethod(path_names_to_string(&trait_ref.path, 0));
|
|
} else {
|
|
return TraitItem;
|
|
}
|
|
}
|
|
}
|
|
|
|
NoSuggestion
|
|
}
|
|
|
|
fn find_best_match(&mut self, name: &str) -> SuggestionType {
|
|
if let Some(macro_name) = self.macro_names.iter().find(|n| n.as_str() == name) {
|
|
return SuggestionType::Macro(format!("{}!", macro_name));
|
|
}
|
|
|
|
let names = self.value_ribs
|
|
.iter()
|
|
.rev()
|
|
.flat_map(|rib| rib.bindings.keys().map(|ident| &ident.name));
|
|
|
|
if let Some(found) = find_best_match_for_name(names, name, None) {
|
|
if name != found {
|
|
return SuggestionType::Function(found);
|
|
}
|
|
} SuggestionType::NotFound
|
|
}
|
|
|
|
fn resolve_labeled_block(&mut self, label: Option<ast::Ident>, id: NodeId, block: &Block) {
|
|
if let Some(label) = label {
|
|
let def = Def::Label(id);
|
|
self.with_label_rib(|this| {
|
|
this.label_ribs.last_mut().unwrap().bindings.insert(label, def);
|
|
this.visit_block(block);
|
|
});
|
|
} else {
|
|
self.visit_block(block);
|
|
}
|
|
}
|
|
|
|
fn resolve_expr(&mut self, expr: &Expr, parent: Option<&Expr>) {
|
|
// First, record candidate traits for this expression if it could
|
|
// result in the invocation of a method call.
|
|
|
|
self.record_candidate_traits_for_expr_if_necessary(expr);
|
|
|
|
// Next, resolve the node.
|
|
match expr.node {
|
|
ExprKind::Path(ref maybe_qself, ref path) => {
|
|
// This is a local path in the value namespace. Walk through
|
|
// scopes looking for it.
|
|
if let Some(path_res) = self.resolve_possibly_assoc_item(expr.id,
|
|
maybe_qself.as_ref(), path, ValueNS) {
|
|
// Check if struct variant
|
|
let is_struct_variant = if let Def::Variant(_, variant_id) = path_res.base_def {
|
|
self.structs.contains_key(&variant_id)
|
|
} else {
|
|
false
|
|
};
|
|
if is_struct_variant {
|
|
let _ = self.structs.contains_key(&path_res.base_def.def_id());
|
|
let path_name = path_names_to_string(path, 0);
|
|
|
|
let mut err = resolve_struct_error(self,
|
|
expr.span,
|
|
ResolutionError::StructVariantUsedAsFunction(&path_name));
|
|
|
|
let msg = format!("did you mean to write: `{} {{ /* fields */ }}`?",
|
|
path_name);
|
|
if self.emit_errors {
|
|
err.help(&msg);
|
|
} else {
|
|
err.span_help(expr.span, &msg);
|
|
}
|
|
err.emit();
|
|
self.record_def(expr.id, err_path_resolution());
|
|
} else {
|
|
// Write the result into the def map.
|
|
debug!("(resolving expr) resolved `{}`",
|
|
path_names_to_string(path, 0));
|
|
|
|
// Partial resolutions will need the set of traits in scope,
|
|
// so they can be completed during typeck.
|
|
if path_res.depth != 0 {
|
|
let method_name = path.segments.last().unwrap().identifier.name;
|
|
let traits = self.get_traits_containing_item(method_name);
|
|
self.trait_map.insert(expr.id, traits);
|
|
}
|
|
|
|
self.record_def(expr.id, path_res);
|
|
}
|
|
} else {
|
|
// Be helpful if the name refers to a struct
|
|
// (The pattern matching def_tys where the id is in self.structs
|
|
// matches on regular structs while excluding tuple- and enum-like
|
|
// structs, which wouldn't result in this error.)
|
|
let path_name = path_names_to_string(path, 0);
|
|
let type_res = self.with_no_errors(|this| {
|
|
this.resolve_path(expr.id, path, 0, TypeNS)
|
|
});
|
|
|
|
self.record_def(expr.id, err_path_resolution());
|
|
|
|
if let Ok(Def::Struct(..)) = type_res.map(|r| r.base_def) {
|
|
let error_variant =
|
|
ResolutionError::StructVariantUsedAsFunction(&path_name);
|
|
let mut err = resolve_struct_error(self, expr.span, error_variant);
|
|
|
|
let msg = format!("did you mean to write: `{} {{ /* fields */ }}`?",
|
|
path_name);
|
|
|
|
if self.emit_errors {
|
|
err.help(&msg);
|
|
} else {
|
|
err.span_help(expr.span, &msg);
|
|
}
|
|
err.emit();
|
|
} else {
|
|
// Keep reporting some errors even if they're ignored above.
|
|
if let Err(true) = self.resolve_path(expr.id, path, 0, ValueNS) {
|
|
// `resolve_path` already reported the error
|
|
} else {
|
|
let mut method_scope = false;
|
|
let mut is_static = false;
|
|
self.value_ribs.iter().rev().all(|rib| {
|
|
method_scope = match rib.kind {
|
|
MethodRibKind(is_static_) => {
|
|
is_static = is_static_;
|
|
true
|
|
}
|
|
ItemRibKind | ConstantItemRibKind => false,
|
|
_ => return true, // Keep advancing
|
|
};
|
|
false // Stop advancing
|
|
});
|
|
|
|
if method_scope &&
|
|
&path_name[..] == keywords::SelfValue.name().as_str() {
|
|
resolve_error(self,
|
|
expr.span,
|
|
ResolutionError::SelfNotAvailableInStaticMethod);
|
|
} else {
|
|
let last_name = path.segments.last().unwrap().identifier.name;
|
|
let (mut msg, is_field) =
|
|
match self.find_fallback_in_self_type(last_name) {
|
|
NoSuggestion => {
|
|
// limit search to 5 to reduce the number
|
|
// of stupid suggestions
|
|
(match self.find_best_match(&path_name) {
|
|
SuggestionType::Macro(s) => {
|
|
format!("the macro `{}`", s)
|
|
}
|
|
SuggestionType::Function(s) => format!("`{}`", s),
|
|
SuggestionType::NotFound => "".to_string(),
|
|
}, false)
|
|
}
|
|
Field => {
|
|
(if is_static && method_scope {
|
|
"".to_string()
|
|
} else {
|
|
format!("`self.{}`", path_name)
|
|
}, true)
|
|
}
|
|
TraitItem => (format!("to call `self.{}`", path_name), false),
|
|
TraitMethod(path_str) =>
|
|
(format!("to call `{}::{}`", path_str, path_name), false),
|
|
};
|
|
|
|
let mut context = UnresolvedNameContext::Other;
|
|
let mut def = Def::Err;
|
|
if !msg.is_empty() {
|
|
msg = format!(". Did you mean {}?", msg);
|
|
} else {
|
|
// we display a help message if this is a module
|
|
let name_path = path.segments.iter()
|
|
.map(|seg| seg.identifier.name)
|
|
.collect::<Vec<_>>();
|
|
|
|
match self.resolve_module_path(&name_path[..],
|
|
UseLexicalScope,
|
|
Some(expr.span)) {
|
|
Success(e) => {
|
|
if let Some(def_type) = e.def {
|
|
def = def_type;
|
|
}
|
|
context = UnresolvedNameContext::PathIsMod(parent);
|
|
},
|
|
_ => {},
|
|
};
|
|
}
|
|
|
|
resolve_error(self,
|
|
expr.span,
|
|
ResolutionError::UnresolvedName {
|
|
path: &path_name,
|
|
message: &msg,
|
|
context: context,
|
|
is_static_method: method_scope && is_static,
|
|
is_field: is_field,
|
|
def: def,
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
visit::walk_expr(self, expr);
|
|
}
|
|
|
|
ExprKind::Struct(ref path, ..) => {
|
|
// Resolve the path to the structure it goes to. We don't
|
|
// check to ensure that the path is actually a structure; that
|
|
// is checked later during typeck.
|
|
match self.resolve_path(expr.id, path, 0, TypeNS) {
|
|
Ok(definition) => self.record_def(expr.id, definition),
|
|
Err(true) => self.record_def(expr.id, err_path_resolution()),
|
|
Err(false) => {
|
|
debug!("(resolving expression) didn't find struct def",);
|
|
|
|
resolve_error(self,
|
|
path.span,
|
|
ResolutionError::DoesNotNameAStruct(
|
|
&path_names_to_string(path, 0))
|
|
);
|
|
self.record_def(expr.id, err_path_resolution());
|
|
}
|
|
}
|
|
|
|
visit::walk_expr(self, expr);
|
|
}
|
|
|
|
ExprKind::Loop(_, Some(label)) | ExprKind::While(.., Some(label)) => {
|
|
self.with_label_rib(|this| {
|
|
let def = Def::Label(expr.id);
|
|
|
|
{
|
|
let rib = this.label_ribs.last_mut().unwrap();
|
|
rib.bindings.insert(label.node, def);
|
|
}
|
|
|
|
visit::walk_expr(this, expr);
|
|
})
|
|
}
|
|
|
|
ExprKind::Break(Some(label)) | ExprKind::Continue(Some(label)) => {
|
|
match self.search_label(label.node) {
|
|
None => {
|
|
self.record_def(expr.id, err_path_resolution());
|
|
resolve_error(self,
|
|
label.span,
|
|
ResolutionError::UndeclaredLabel(&label.node.name.as_str()))
|
|
}
|
|
Some(def @ Def::Label(_)) => {
|
|
// Since this def is a label, it is never read.
|
|
self.record_def(expr.id, PathResolution::new(def))
|
|
}
|
|
Some(_) => {
|
|
span_bug!(expr.span, "label wasn't mapped to a label def!")
|
|
}
|
|
}
|
|
}
|
|
|
|
ExprKind::IfLet(ref pattern, ref subexpression, ref if_block, ref optional_else) => {
|
|
self.visit_expr(subexpression);
|
|
|
|
self.value_ribs.push(Rib::new(NormalRibKind));
|
|
self.resolve_pattern(pattern, PatternSource::IfLet, &mut FnvHashMap());
|
|
self.visit_block(if_block);
|
|
self.value_ribs.pop();
|
|
|
|
optional_else.as_ref().map(|expr| self.visit_expr(expr));
|
|
}
|
|
|
|
ExprKind::WhileLet(ref pattern, ref subexpression, ref block, label) => {
|
|
self.visit_expr(subexpression);
|
|
self.value_ribs.push(Rib::new(NormalRibKind));
|
|
self.resolve_pattern(pattern, PatternSource::WhileLet, &mut FnvHashMap());
|
|
|
|
self.resolve_labeled_block(label.map(|l| l.node), expr.id, block);
|
|
|
|
self.value_ribs.pop();
|
|
}
|
|
|
|
ExprKind::ForLoop(ref pattern, ref subexpression, ref block, label) => {
|
|
self.visit_expr(subexpression);
|
|
self.value_ribs.push(Rib::new(NormalRibKind));
|
|
self.resolve_pattern(pattern, PatternSource::For, &mut FnvHashMap());
|
|
|
|
self.resolve_labeled_block(label.map(|l| l.node), expr.id, block);
|
|
|
|
self.value_ribs.pop();
|
|
}
|
|
|
|
ExprKind::Field(ref subexpression, _) => {
|
|
self.resolve_expr(subexpression, Some(expr));
|
|
}
|
|
ExprKind::MethodCall(_, ref types, ref arguments) => {
|
|
let mut arguments = arguments.iter();
|
|
self.resolve_expr(arguments.next().unwrap(), Some(expr));
|
|
for argument in arguments {
|
|
self.resolve_expr(argument, None);
|
|
}
|
|
for ty in types.iter() {
|
|
self.visit_ty(ty);
|
|
}
|
|
}
|
|
|
|
_ => {
|
|
visit::walk_expr(self, expr);
|
|
}
|
|
}
|
|
}
|
|
|
|
fn record_candidate_traits_for_expr_if_necessary(&mut self, expr: &Expr) {
|
|
match expr.node {
|
|
ExprKind::Field(_, name) => {
|
|
// FIXME(#6890): Even though you can't treat a method like a
|
|
// field, we need to add any trait methods we find that match
|
|
// the field name so that we can do some nice error reporting
|
|
// later on in typeck.
|
|
let traits = self.get_traits_containing_item(name.node.name);
|
|
self.trait_map.insert(expr.id, traits);
|
|
}
|
|
ExprKind::MethodCall(name, ..) => {
|
|
debug!("(recording candidate traits for expr) recording traits for {}",
|
|
expr.id);
|
|
let traits = self.get_traits_containing_item(name.node.name);
|
|
self.trait_map.insert(expr.id, traits);
|
|
}
|
|
_ => {
|
|
// Nothing to do.
|
|
}
|
|
}
|
|
}
|
|
|
|
fn get_traits_containing_item(&mut self, name: Name) -> Vec<TraitCandidate> {
|
|
debug!("(getting traits containing item) looking for '{}'", name);
|
|
|
|
fn add_trait_info(found_traits: &mut Vec<TraitCandidate>,
|
|
trait_def_id: DefId,
|
|
import_id: Option<NodeId>,
|
|
name: Name) {
|
|
debug!("(adding trait info) found trait {:?} for method '{}'",
|
|
trait_def_id,
|
|
name);
|
|
found_traits.push(TraitCandidate {
|
|
def_id: trait_def_id,
|
|
import_id: import_id,
|
|
});
|
|
}
|
|
|
|
let mut found_traits = Vec::new();
|
|
// Look for the current trait.
|
|
if let Some((trait_def_id, _)) = self.current_trait_ref {
|
|
if self.trait_item_map.contains_key(&(name, trait_def_id)) {
|
|
add_trait_info(&mut found_traits, trait_def_id, None, name);
|
|
}
|
|
}
|
|
|
|
let mut search_module = self.current_module;
|
|
loop {
|
|
// Look for trait children.
|
|
let mut search_in_module = |this: &mut Self, module: Module<'a>| {
|
|
let mut traits = module.traits.borrow_mut();
|
|
if traits.is_none() {
|
|
let mut collected_traits = Vec::new();
|
|
module.for_each_child(|name, ns, binding| {
|
|
if ns != TypeNS { return }
|
|
if let Def::Trait(_) = binding.def() {
|
|
collected_traits.push((name, binding));
|
|
}
|
|
});
|
|
*traits = Some(collected_traits.into_boxed_slice());
|
|
}
|
|
|
|
for &(trait_name, binding) in traits.as_ref().unwrap().iter() {
|
|
let trait_def_id = binding.def().def_id();
|
|
if this.trait_item_map.contains_key(&(name, trait_def_id)) {
|
|
let mut import_id = None;
|
|
if let NameBindingKind::Import { directive, .. } = binding.kind {
|
|
let id = directive.id;
|
|
this.maybe_unused_trait_imports.insert(id);
|
|
this.add_to_glob_map(id, trait_name);
|
|
import_id = Some(id);
|
|
}
|
|
add_trait_info(&mut found_traits, trait_def_id, import_id, name);
|
|
}
|
|
}
|
|
};
|
|
search_in_module(self, search_module);
|
|
|
|
match search_module.parent_link {
|
|
NoParentLink | ModuleParentLink(..) => {
|
|
if !search_module.no_implicit_prelude.get() {
|
|
self.prelude.map(|prelude| search_in_module(self, prelude));
|
|
}
|
|
break;
|
|
}
|
|
BlockParentLink(parent_module, _) => {
|
|
search_module = parent_module;
|
|
}
|
|
}
|
|
}
|
|
|
|
found_traits
|
|
}
|
|
|
|
/// When name resolution fails, this method can be used to look up candidate
|
|
/// entities with the expected name. It allows filtering them using the
|
|
/// supplied predicate (which should be used to only accept the types of
|
|
/// definitions expected e.g. traits). The lookup spans across all crates.
|
|
///
|
|
/// NOTE: The method does not look into imports, but this is not a problem,
|
|
/// since we report the definitions (thus, the de-aliased imports).
|
|
fn lookup_candidates<FilterFn>(&mut self,
|
|
lookup_name: Name,
|
|
namespace: Namespace,
|
|
filter_fn: FilterFn) -> SuggestedCandidates
|
|
where FilterFn: Fn(Def) -> bool {
|
|
|
|
let mut lookup_results = Vec::new();
|
|
let mut worklist = Vec::new();
|
|
worklist.push((self.graph_root, Vec::new(), false));
|
|
|
|
while let Some((in_module,
|
|
path_segments,
|
|
in_module_is_extern)) = worklist.pop() {
|
|
self.populate_module_if_necessary(in_module);
|
|
|
|
in_module.for_each_child(|name, ns, name_binding| {
|
|
|
|
// avoid imports entirely
|
|
if name_binding.is_import() { return; }
|
|
|
|
// collect results based on the filter function
|
|
if name == lookup_name && ns == namespace {
|
|
if filter_fn(name_binding.def()) {
|
|
// create the path
|
|
let ident = ast::Ident::with_empty_ctxt(name);
|
|
let params = PathParameters::none();
|
|
let segment = PathSegment {
|
|
identifier: ident,
|
|
parameters: params,
|
|
};
|
|
let span = name_binding.span;
|
|
let mut segms = path_segments.clone();
|
|
segms.push(segment);
|
|
let path = Path {
|
|
span: span,
|
|
global: true,
|
|
segments: segms,
|
|
};
|
|
// the entity is accessible in the following cases:
|
|
// 1. if it's defined in the same crate, it's always
|
|
// accessible (since private entities can be made public)
|
|
// 2. if it's defined in another crate, it's accessible
|
|
// only if both the module is public and the entity is
|
|
// declared as public (due to pruning, we don't explore
|
|
// outside crate private modules => no need to check this)
|
|
if !in_module_is_extern || name_binding.vis == ty::Visibility::Public {
|
|
lookup_results.push(path);
|
|
}
|
|
}
|
|
}
|
|
|
|
// collect submodules to explore
|
|
if let Ok(module) = name_binding.module() {
|
|
// form the path
|
|
let path_segments = match module.parent_link {
|
|
NoParentLink => path_segments.clone(),
|
|
ModuleParentLink(_, name) => {
|
|
let mut paths = path_segments.clone();
|
|
let ident = ast::Ident::with_empty_ctxt(name);
|
|
let params = PathParameters::none();
|
|
let segm = PathSegment {
|
|
identifier: ident,
|
|
parameters: params,
|
|
};
|
|
paths.push(segm);
|
|
paths
|
|
}
|
|
_ => bug!(),
|
|
};
|
|
|
|
if !in_module_is_extern || name_binding.vis == ty::Visibility::Public {
|
|
// add the module to the lookup
|
|
let is_extern = in_module_is_extern || name_binding.is_extern_crate();
|
|
if !worklist.iter().any(|&(m, ..)| m.def == module.def) {
|
|
worklist.push((module, path_segments, is_extern));
|
|
}
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
SuggestedCandidates {
|
|
name: lookup_name.as_str().to_string(),
|
|
candidates: lookup_results,
|
|
}
|
|
}
|
|
|
|
fn record_def(&mut self, node_id: NodeId, resolution: PathResolution) {
|
|
debug!("(recording def) recording {:?} for {}", resolution, node_id);
|
|
if let Some(prev_res) = self.def_map.insert(node_id, resolution) {
|
|
panic!("path resolved multiple times ({:?} before, {:?} now)", prev_res, resolution);
|
|
}
|
|
}
|
|
|
|
fn resolve_visibility(&mut self, vis: &ast::Visibility) -> ty::Visibility {
|
|
let (path, id) = match *vis {
|
|
ast::Visibility::Public => return ty::Visibility::Public,
|
|
ast::Visibility::Crate(_) => return ty::Visibility::Restricted(ast::CRATE_NODE_ID),
|
|
ast::Visibility::Restricted { ref path, id } => (path, id),
|
|
ast::Visibility::Inherited => {
|
|
return ty::Visibility::Restricted(self.current_module.normal_ancestor_id.unwrap());
|
|
}
|
|
};
|
|
|
|
let segments: Vec<_> = path.segments.iter().map(|seg| seg.identifier.name).collect();
|
|
let mut path_resolution = err_path_resolution();
|
|
let vis = match self.resolve_module_path(&segments, DontUseLexicalScope, Some(path.span)) {
|
|
Success(module) => {
|
|
path_resolution = PathResolution::new(module.def.unwrap());
|
|
ty::Visibility::Restricted(module.normal_ancestor_id.unwrap())
|
|
}
|
|
Indeterminate => unreachable!(),
|
|
Failed(err) => {
|
|
if let Some((span, msg)) = err {
|
|
self.session.span_err(span, &format!("failed to resolve module path. {}", msg));
|
|
}
|
|
ty::Visibility::Public
|
|
}
|
|
};
|
|
self.def_map.insert(id, path_resolution);
|
|
if !self.is_accessible(vis) {
|
|
let msg = format!("visibilities can only be restricted to ancestor modules");
|
|
self.session.span_err(path.span, &msg);
|
|
}
|
|
vis
|
|
}
|
|
|
|
fn is_accessible(&self, vis: ty::Visibility) -> bool {
|
|
vis.is_accessible_from(self.current_module.normal_ancestor_id.unwrap(), self)
|
|
}
|
|
|
|
fn is_accessible_from(&self, vis: ty::Visibility, module: Module<'a>) -> bool {
|
|
vis.is_accessible_from(module.normal_ancestor_id.unwrap(), self)
|
|
}
|
|
|
|
fn report_errors(&self) {
|
|
let mut reported_spans = FnvHashSet();
|
|
|
|
for &AmbiguityError { span, name, b1, b2 } in &self.ambiguity_errors {
|
|
if !reported_spans.insert(span) { continue }
|
|
let msg1 = format!("`{}` could resolve to the name imported here", name);
|
|
let msg2 = format!("`{}` could also resolve to the name imported here", name);
|
|
self.session.struct_span_err(span, &format!("`{}` is ambiguous", name))
|
|
.span_note(b1.span, &msg1)
|
|
.span_note(b2.span, &msg2)
|
|
.note(&format!("Consider adding an explicit import of `{}` to disambiguate", name))
|
|
.emit();
|
|
}
|
|
|
|
for &PrivacyError(span, name, binding) in &self.privacy_errors {
|
|
if !reported_spans.insert(span) { continue }
|
|
if binding.is_extern_crate() {
|
|
// Warn when using an inaccessible extern crate.
|
|
let node_id = binding.module().unwrap().extern_crate_id.unwrap();
|
|
let msg = format!("extern crate `{}` is private", name);
|
|
self.session.add_lint(lint::builtin::INACCESSIBLE_EXTERN_CRATE, node_id, span, msg);
|
|
} else {
|
|
let def = binding.def();
|
|
self.session.span_err(span, &format!("{} `{}` is private", def.kind_name(), name));
|
|
}
|
|
}
|
|
}
|
|
|
|
fn report_conflict(&self,
|
|
parent: Module,
|
|
name: Name,
|
|
ns: Namespace,
|
|
binding: &NameBinding,
|
|
old_binding: &NameBinding) {
|
|
// Error on the second of two conflicting names
|
|
if old_binding.span.lo > binding.span.lo {
|
|
return self.report_conflict(parent, name, ns, old_binding, binding);
|
|
}
|
|
|
|
let container = match parent.def {
|
|
Some(Def::Mod(_)) => "module",
|
|
Some(Def::Trait(_)) => "trait",
|
|
None => "block",
|
|
_ => "enum",
|
|
};
|
|
|
|
let (participle, noun) = match old_binding.is_import() || old_binding.is_extern_crate() {
|
|
true => ("imported", "import"),
|
|
false => ("defined", "definition"),
|
|
};
|
|
|
|
let span = binding.span;
|
|
let msg = {
|
|
let kind = match (ns, old_binding.module()) {
|
|
(ValueNS, _) => "a value",
|
|
(TypeNS, Ok(module)) if module.extern_crate_id.is_some() => "an extern crate",
|
|
(TypeNS, Ok(module)) if module.is_normal() => "a module",
|
|
(TypeNS, Ok(module)) if module.is_trait() => "a trait",
|
|
(TypeNS, _) => "a type",
|
|
};
|
|
format!("{} named `{}` has already been {} in this {}",
|
|
kind, name, participle, container)
|
|
};
|
|
|
|
let mut err = match (old_binding.is_extern_crate(), binding.is_extern_crate()) {
|
|
(true, true) => {
|
|
let mut e = struct_span_err!(self.session, span, E0259, "{}", msg);
|
|
e.span_label(span, &format!("`{}` was already imported", name));
|
|
e
|
|
},
|
|
(true, _) | (_, true) if binding.is_import() || old_binding.is_import() => {
|
|
let mut e = struct_span_err!(self.session, span, E0254, "{}", msg);
|
|
e.span_label(span, &"already imported");
|
|
e
|
|
},
|
|
(true, _) | (_, true) => {
|
|
let mut e = struct_span_err!(self.session, span, E0260, "{}", msg);
|
|
e.span_label(span, &format!("`{}` already imported", name));
|
|
e
|
|
},
|
|
_ => match (old_binding.is_import(), binding.is_import()) {
|
|
(false, false) => {
|
|
let mut e = struct_span_err!(self.session, span, E0428, "{}", msg);
|
|
e.span_label(span, &format!("already defined"));
|
|
e
|
|
},
|
|
(true, true) => {
|
|
let mut e = struct_span_err!(self.session, span, E0252, "{}", msg);
|
|
e.span_label(span, &format!("already imported"));
|
|
e
|
|
},
|
|
_ => {
|
|
let mut e = struct_span_err!(self.session, span, E0255, "{}", msg);
|
|
e.span_label(span, &format!("`{}` was already imported", name));
|
|
e
|
|
}
|
|
},
|
|
};
|
|
|
|
if old_binding.span != syntax_pos::DUMMY_SP {
|
|
err.span_label(old_binding.span, &format!("previous {} of `{}` here", noun, name));
|
|
}
|
|
err.emit();
|
|
}
|
|
}
|
|
|
|
fn names_to_string(names: &[Name]) -> String {
|
|
let mut first = true;
|
|
let mut result = String::new();
|
|
for name in names {
|
|
if first {
|
|
first = false
|
|
} else {
|
|
result.push_str("::")
|
|
}
|
|
result.push_str(&name.as_str());
|
|
}
|
|
result
|
|
}
|
|
|
|
fn path_names_to_string(path: &Path, depth: usize) -> String {
|
|
let names: Vec<ast::Name> = path.segments[..path.segments.len() - depth]
|
|
.iter()
|
|
.map(|seg| seg.identifier.name)
|
|
.collect();
|
|
names_to_string(&names[..])
|
|
}
|
|
|
|
/// When an entity with a given name is not available in scope, we search for
|
|
/// entities with that name in all crates. This method allows outputting the
|
|
/// results of this search in a programmer-friendly way
|
|
fn show_candidates(session: &mut DiagnosticBuilder,
|
|
candidates: &SuggestedCandidates) {
|
|
|
|
let paths = &candidates.candidates;
|
|
|
|
if paths.len() > 0 {
|
|
// don't show more than MAX_CANDIDATES results, so
|
|
// we're consistent with the trait suggestions
|
|
const MAX_CANDIDATES: usize = 5;
|
|
|
|
// we want consistent results across executions, but candidates are produced
|
|
// by iterating through a hash map, so make sure they are ordered:
|
|
let mut path_strings: Vec<_> = paths.into_iter()
|
|
.map(|p| path_names_to_string(&p, 0))
|
|
.collect();
|
|
path_strings.sort();
|
|
|
|
// behave differently based on how many candidates we have:
|
|
if !paths.is_empty() {
|
|
if paths.len() == 1 {
|
|
session.help(
|
|
&format!("you can import it into scope: `use {};`.",
|
|
&path_strings[0]),
|
|
);
|
|
} else {
|
|
session.help("you can import several candidates \
|
|
into scope (`use ...;`):");
|
|
let count = path_strings.len() as isize - MAX_CANDIDATES as isize + 1;
|
|
|
|
for (idx, path_string) in path_strings.iter().enumerate() {
|
|
if idx == MAX_CANDIDATES - 1 && count > 1 {
|
|
session.help(
|
|
&format!(" and {} other candidates", count).to_string(),
|
|
);
|
|
break;
|
|
} else {
|
|
session.help(
|
|
&format!(" `{}`", path_string).to_string(),
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
// nothing found:
|
|
session.help(
|
|
&format!("no candidates by the name of `{}` found in your \
|
|
project; maybe you misspelled the name or forgot to import \
|
|
an external crate?", candidates.name.to_string()),
|
|
);
|
|
};
|
|
}
|
|
|
|
/// A somewhat inefficient routine to obtain the name of a module.
|
|
fn module_to_string(module: Module) -> String {
|
|
let mut names = Vec::new();
|
|
|
|
fn collect_mod(names: &mut Vec<ast::Name>, module: Module) {
|
|
match module.parent_link {
|
|
NoParentLink => {}
|
|
ModuleParentLink(ref module, name) => {
|
|
names.push(name);
|
|
collect_mod(names, module);
|
|
}
|
|
BlockParentLink(ref module, _) => {
|
|
// danger, shouldn't be ident?
|
|
names.push(token::intern("<opaque>"));
|
|
collect_mod(names, module);
|
|
}
|
|
}
|
|
}
|
|
collect_mod(&mut names, module);
|
|
|
|
if names.is_empty() {
|
|
return "???".to_string();
|
|
}
|
|
names_to_string(&names.into_iter().rev().collect::<Vec<ast::Name>>())
|
|
}
|
|
|
|
fn err_path_resolution() -> PathResolution {
|
|
PathResolution::new(Def::Err)
|
|
}
|
|
|
|
#[derive(PartialEq,Copy, Clone)]
|
|
pub enum MakeGlobMap {
|
|
Yes,
|
|
No,
|
|
}
|
|
|
|
__build_diagnostic_array! { librustc_resolve, DIAGNOSTICS }
|