| // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| use self::ImportDirectiveSubclass::*; |
| |
| use DefModifiers; |
| use Module; |
| use ModuleKind; |
| use Namespace::{self, TypeNS, ValueNS}; |
| use NameBindings; |
| use NamespaceResult::{BoundResult, UnboundResult, UnknownResult}; |
| use NamespaceResult; |
| use NameSearchType; |
| use ResolveResult; |
| use Resolver; |
| use UseLexicalScopeFlag; |
| use {names_to_string, module_to_string}; |
| use {resolve_error, ResolutionError}; |
| |
| use build_reduced_graph; |
| |
| use rustc::middle::def::*; |
| use rustc::middle::def_id::DefId; |
| use rustc::middle::privacy::*; |
| |
| use syntax::ast::{NodeId, Name}; |
| use syntax::attr::AttrMetaMethods; |
| use syntax::codemap::Span; |
| |
| use std::mem::replace; |
| use std::rc::Rc; |
| |
| |
| /// Contains data for specific types of import directives. |
| #[derive(Copy, Clone,Debug)] |
| pub enum ImportDirectiveSubclass { |
| SingleImport(Name /* target */, Name /* source */), |
| GlobImport |
| } |
| |
| /// Whether an import can be shadowed by another import. |
| #[derive(Debug,PartialEq,Clone,Copy)] |
| pub enum Shadowable { |
| Always, |
| Never |
| } |
| |
| /// One import directive. |
| #[derive(Debug)] |
| pub struct ImportDirective { |
| pub module_path: Vec<Name>, |
| pub subclass: ImportDirectiveSubclass, |
| pub span: Span, |
| pub id: NodeId, |
| pub is_public: bool, // see note in ImportResolution about how to use this |
| pub shadowable: Shadowable, |
| } |
| |
| impl ImportDirective { |
| pub fn new(module_path: Vec<Name> , |
| subclass: ImportDirectiveSubclass, |
| span: Span, |
| id: NodeId, |
| is_public: bool, |
| shadowable: Shadowable) |
| -> ImportDirective { |
| ImportDirective { |
| module_path: module_path, |
| subclass: subclass, |
| span: span, |
| id: id, |
| is_public: is_public, |
| shadowable: shadowable, |
| } |
| } |
| } |
| |
| /// The item that an import resolves to. |
| #[derive(Clone,Debug)] |
| pub struct Target { |
| pub target_module: Rc<Module>, |
| pub bindings: Rc<NameBindings>, |
| pub shadowable: Shadowable, |
| } |
| |
| impl Target { |
| pub fn new(target_module: Rc<Module>, |
| bindings: Rc<NameBindings>, |
| shadowable: Shadowable) |
| -> Target { |
| Target { |
| target_module: target_module, |
| bindings: bindings, |
| shadowable: shadowable, |
| } |
| } |
| } |
| |
| /// An ImportResolution represents a particular `use` directive. |
| #[derive(Debug)] |
| pub struct ImportResolution { |
| /// Whether this resolution came from a `use` or a `pub use`. Note that this |
| /// should *not* be used whenever resolution is being performed. Privacy |
| /// testing occurs during a later phase of compilation. |
| pub is_public: bool, |
| |
| // The number of outstanding references to this name. When this reaches |
| // zero, outside modules can count on the targets being correct. Before |
| // then, all bets are off; future imports could override this name. |
| // Note that this is usually either 0 or 1 - shadowing is forbidden the only |
| // way outstanding_references is > 1 in a legal program is if the name is |
| // used in both namespaces. |
| pub outstanding_references: usize, |
| |
| /// The value that this `use` directive names, if there is one. |
| pub value_target: Option<Target>, |
| /// The source node of the `use` directive leading to the value target |
| /// being non-none |
| pub value_id: NodeId, |
| |
| /// The type that this `use` directive names, if there is one. |
| pub type_target: Option<Target>, |
| /// The source node of the `use` directive leading to the type target |
| /// being non-none |
| pub type_id: NodeId, |
| } |
| |
| impl ImportResolution { |
| pub fn new(id: NodeId, is_public: bool) -> ImportResolution { |
| ImportResolution { |
| type_id: id, |
| value_id: id, |
| outstanding_references: 0, |
| value_target: None, |
| type_target: None, |
| is_public: is_public, |
| } |
| } |
| |
| pub fn target_for_namespace(&self, namespace: Namespace) |
| -> Option<Target> { |
| match namespace { |
| TypeNS => self.type_target.clone(), |
| ValueNS => self.value_target.clone(), |
| } |
| } |
| |
| pub fn id(&self, namespace: Namespace) -> NodeId { |
| match namespace { |
| TypeNS => self.type_id, |
| ValueNS => self.value_id, |
| } |
| } |
| |
| pub fn shadowable(&self, namespace: Namespace) -> Shadowable { |
| let target = self.target_for_namespace(namespace); |
| if target.is_none() { |
| return Shadowable::Always; |
| } |
| |
| target.unwrap().shadowable |
| } |
| |
| pub fn set_target_and_id(&mut self, |
| namespace: Namespace, |
| target: Option<Target>, |
| id: NodeId) { |
| match namespace { |
| TypeNS => { |
| self.type_target = target; |
| self.type_id = id; |
| } |
| ValueNS => { |
| self.value_target = target; |
| self.value_id = id; |
| } |
| } |
| } |
| } |
| |
| struct ImportResolvingError { |
| span: Span, |
| path: String, |
| help: String, |
| } |
| |
| struct ImportResolver<'a, 'b:'a, 'tcx:'b> { |
| resolver: &'a mut Resolver<'b, 'tcx> |
| } |
| |
| impl<'a, 'b:'a, 'tcx:'b> ImportResolver<'a, 'b, 'tcx> { |
| // Import resolution |
| // |
| // This is a fixed-point algorithm. We resolve imports until our efforts |
| // are stymied by an unresolved import; then we bail out of the current |
| // module and continue. We terminate successfully once no more imports |
| // remain or unsuccessfully when no forward progress in resolving imports |
| // is made. |
| |
| /// Resolves all imports for the crate. This method performs the fixed- |
| /// point iteration. |
| fn resolve_imports(&mut self) { |
| let mut i = 0; |
| let mut prev_unresolved_imports = 0; |
| loop { |
| debug!("(resolving imports) iteration {}, {} imports left", |
| i, self.resolver.unresolved_imports); |
| |
| let module_root = self.resolver.graph_root.get_module(); |
| let errors = self.resolve_imports_for_module_subtree(module_root.clone()); |
| |
| if self.resolver.unresolved_imports == 0 { |
| debug!("(resolving imports) success"); |
| break; |
| } |
| |
| if self.resolver.unresolved_imports == prev_unresolved_imports { |
| // resolving failed |
| if errors.len() > 0 { |
| for e in errors { |
| resolve_error(self.resolver, |
| e.span, |
| ResolutionError::UnresolvedImport(Some((&e.path, &e.help)))); |
| } |
| } else { |
| // Report unresolved imports only if no hard error was already reported |
| // to avoid generating multiple errors on the same import. |
| // Imports that are still indeterminate at this point are actually blocked |
| // by errored imports, so there is no point reporting them. |
| self.resolver.report_unresolved_imports(module_root); |
| } |
| break; |
| } |
| |
| i += 1; |
| prev_unresolved_imports = self.resolver.unresolved_imports; |
| } |
| } |
| |
| /// Attempts to resolve imports for the given module and all of its |
| /// submodules. |
| fn resolve_imports_for_module_subtree(&mut self, module_: Rc<Module>) |
| -> Vec<ImportResolvingError> { |
| let mut errors = Vec::new(); |
| debug!("(resolving imports for module subtree) resolving {}", |
| module_to_string(&*module_)); |
| let orig_module = replace(&mut self.resolver.current_module, module_.clone()); |
| errors.extend(self.resolve_imports_for_module(module_.clone())); |
| self.resolver.current_module = orig_module; |
| |
| build_reduced_graph::populate_module_if_necessary(self.resolver, &module_); |
| for (_, child_node) in module_.children.borrow().iter() { |
| match child_node.get_module_if_available() { |
| None => { |
| // Nothing to do. |
| } |
| Some(child_module) => { |
| errors.extend(self.resolve_imports_for_module_subtree(child_module)); |
| } |
| } |
| } |
| |
| for (_, child_module) in module_.anonymous_children.borrow().iter() { |
| errors.extend(self.resolve_imports_for_module_subtree(child_module.clone())); |
| } |
| |
| errors |
| } |
| |
| /// Attempts to resolve imports for the given module only. |
| fn resolve_imports_for_module(&mut self, module: Rc<Module>) -> Vec<ImportResolvingError> { |
| let mut errors = Vec::new(); |
| |
| if module.all_imports_resolved() { |
| debug!("(resolving imports for module) all imports resolved for \ |
| {}", |
| module_to_string(&*module)); |
| return errors; |
| } |
| |
| let mut imports = module.imports.borrow_mut(); |
| let import_count = imports.len(); |
| let mut indeterminate_imports = Vec::new(); |
| while module.resolved_import_count.get() + indeterminate_imports.len() < import_count { |
| let import_index = module.resolved_import_count.get(); |
| match self.resolve_import_for_module(module.clone(), |
| &imports[import_index]) { |
| ResolveResult::Failed(err) => { |
| let import_directive = &imports[import_index]; |
| let (span, help) = match err { |
| Some((span, msg)) => (span, format!(". {}", msg)), |
| None => (import_directive.span, String::new()) |
| }; |
| errors.push(ImportResolvingError { |
| span: span, |
| path: import_path_to_string( |
| &import_directive.module_path, |
| import_directive.subclass |
| ), |
| help: help |
| }); |
| } |
| ResolveResult::Indeterminate => {} |
| ResolveResult::Success(()) => { |
| // count success |
| module.resolved_import_count |
| .set(module.resolved_import_count.get() + 1); |
| continue; |
| } |
| } |
| // This resolution was not successful, keep it for later |
| indeterminate_imports.push(imports.swap_remove(import_index)); |
| |
| } |
| |
| imports.extend(indeterminate_imports); |
| |
| errors |
| } |
| |
| /// Attempts to resolve the given import. The return value indicates |
| /// failure if we're certain the name does not exist, indeterminate if we |
| /// don't know whether the name exists at the moment due to other |
| /// currently-unresolved imports, or success if we know the name exists. |
| /// If successful, the resolved bindings are written into the module. |
| fn resolve_import_for_module(&mut self, |
| module_: Rc<Module>, |
| import_directive: &ImportDirective) |
| -> ResolveResult<()> { |
| let mut resolution_result = ResolveResult::Failed(None); |
| let module_path = &import_directive.module_path; |
| |
| debug!("(resolving import for module) resolving import `{}::...` in `{}`", |
| names_to_string(&module_path[..]), |
| module_to_string(&*module_)); |
| |
| // First, resolve the module path for the directive, if necessary. |
| let container = if module_path.is_empty() { |
| // Use the crate root. |
| Some((self.resolver.graph_root.get_module(), LastMod(AllPublic))) |
| } else { |
| match self.resolver.resolve_module_path(module_.clone(), |
| &module_path[..], |
| UseLexicalScopeFlag::DontUseLexicalScope, |
| import_directive.span, |
| NameSearchType::ImportSearch) { |
| ResolveResult::Failed(err) => { |
| resolution_result = ResolveResult::Failed(err); |
| None |
| }, |
| ResolveResult::Indeterminate => { |
| resolution_result = ResolveResult::Indeterminate; |
| None |
| } |
| ResolveResult::Success(container) => Some(container), |
| } |
| }; |
| |
| match container { |
| None => {} |
| Some((containing_module, lp)) => { |
| // We found the module that the target is contained |
| // within. Attempt to resolve the import within it. |
| |
| match import_directive.subclass { |
| SingleImport(target, source) => { |
| resolution_result = |
| self.resolve_single_import(&module_, |
| containing_module, |
| target, |
| source, |
| import_directive, |
| lp); |
| } |
| GlobImport => { |
| resolution_result = |
| self.resolve_glob_import(&module_, |
| containing_module, |
| import_directive, |
| lp); |
| } |
| } |
| } |
| } |
| |
| // Decrement the count of unresolved imports. |
| match resolution_result { |
| ResolveResult::Success(()) => { |
| assert!(self.resolver.unresolved_imports >= 1); |
| self.resolver.unresolved_imports -= 1; |
| } |
| _ => { |
| // Nothing to do here; just return the error. |
| } |
| } |
| |
| // Decrement the count of unresolved globs if necessary. But only if |
| // the resolution result is a success -- other cases will |
| // be handled by the main loop. |
| |
| if resolution_result.success() { |
| match import_directive.subclass { |
| GlobImport => { |
| module_.dec_glob_count(); |
| if import_directive.is_public { |
| module_.dec_pub_glob_count(); |
| } |
| } |
| SingleImport(..) => { |
| // Ignore. |
| } |
| } |
| if import_directive.is_public { |
| module_.dec_pub_count(); |
| } |
| } |
| |
| return resolution_result; |
| } |
| |
| fn resolve_single_import(&mut self, |
| module_: &Module, |
| target_module: Rc<Module>, |
| target: Name, |
| source: Name, |
| directive: &ImportDirective, |
| lp: LastPrivate) |
| -> ResolveResult<()> { |
| debug!("(resolving single import) resolving `{}` = `{}::{}` from \ |
| `{}` id {}, last private {:?}", |
| target, |
| module_to_string(&*target_module), |
| source, |
| module_to_string(module_), |
| directive.id, |
| lp); |
| |
| let lp = match lp { |
| LastMod(lp) => lp, |
| LastImport {..} => { |
| self.resolver.session |
| .span_bug(directive.span, |
| "not expecting Import here, must be LastMod") |
| } |
| }; |
| |
| // We need to resolve both namespaces for this to succeed. |
| // |
| |
| let mut value_result = UnknownResult; |
| let mut type_result = UnknownResult; |
| |
| // Search for direct children of the containing module. |
| build_reduced_graph::populate_module_if_necessary(self.resolver, &target_module); |
| |
| match target_module.children.borrow().get(&source) { |
| None => { |
| // Continue. |
| } |
| Some(ref child_name_bindings) => { |
| // pub_err makes sure we don't give the same error twice. |
| let mut pub_err = false; |
| if child_name_bindings.defined_in_namespace(ValueNS) { |
| debug!("(resolving single import) found value binding"); |
| value_result = BoundResult(target_module.clone(), |
| (*child_name_bindings).clone()); |
| if directive.is_public && !child_name_bindings.is_public(ValueNS) { |
| let msg = format!("`{}` is private, and cannot be reexported", |
| source); |
| let note_msg = |
| format!("Consider marking `{}` as `pub` in the imported module", |
| source); |
| span_err!(self.resolver.session, directive.span, E0364, "{}", &msg); |
| self.resolver.session.span_note(directive.span, ¬e_msg); |
| pub_err = true; |
| } |
| } |
| if child_name_bindings.defined_in_namespace(TypeNS) { |
| debug!("(resolving single import) found type binding"); |
| type_result = BoundResult(target_module.clone(), |
| (*child_name_bindings).clone()); |
| if !pub_err && directive.is_public && !child_name_bindings.is_public(TypeNS) { |
| let msg = format!("`{}` is private, and cannot be reexported", |
| source); |
| let note_msg = format!("Consider declaring module `{}` as a `pub mod`", |
| source); |
| span_err!(self.resolver.session, directive.span, E0365, "{}", &msg); |
| self.resolver.session.span_note(directive.span, ¬e_msg); |
| } |
| } |
| } |
| } |
| |
| // Unless we managed to find a result in both namespaces (unlikely), |
| // search imports as well. |
| let mut value_used_reexport = false; |
| let mut type_used_reexport = false; |
| match (value_result.clone(), type_result.clone()) { |
| (BoundResult(..), BoundResult(..)) => {} // Continue. |
| _ => { |
| // If there is an unresolved glob at this point in the |
| // containing module, bail out. We don't know enough to be |
| // able to resolve this import. |
| |
| if target_module.pub_glob_count.get() > 0 { |
| debug!("(resolving single import) unresolved pub glob; \ |
| bailing out"); |
| return ResolveResult::Indeterminate; |
| } |
| |
| // Now search the exported imports within the containing module. |
| match target_module.import_resolutions.borrow().get(&source) { |
| None => { |
| debug!("(resolving single import) no import"); |
| // The containing module definitely doesn't have an |
| // exported import with the name in question. We can |
| // therefore accurately report that the names are |
| // unbound. |
| |
| if value_result.is_unknown() { |
| value_result = UnboundResult; |
| } |
| if type_result.is_unknown() { |
| type_result = UnboundResult; |
| } |
| } |
| Some(import_resolution) |
| if import_resolution.outstanding_references == 0 => { |
| |
| fn get_binding(this: &mut Resolver, |
| import_resolution: &ImportResolution, |
| namespace: Namespace, |
| source: &Name) |
| -> NamespaceResult { |
| |
| // Import resolutions must be declared with "pub" |
| // in order to be exported. |
| if !import_resolution.is_public { |
| return UnboundResult; |
| } |
| |
| match import_resolution.target_for_namespace(namespace) { |
| None => { |
| return UnboundResult; |
| } |
| Some(Target { |
| target_module, |
| bindings, |
| shadowable: _ |
| }) => { |
| debug!("(resolving single import) found \ |
| import in ns {:?}", namespace); |
| let id = import_resolution.id(namespace); |
| // track used imports and extern crates as well |
| this.used_imports.insert((id, namespace)); |
| this.record_import_use(id, *source); |
| match target_module.def_id.get() { |
| Some(DefId{krate: kid, ..}) => { |
| this.used_crates.insert(kid); |
| }, |
| _ => {} |
| } |
| return BoundResult(target_module, bindings); |
| } |
| } |
| } |
| |
| // The name is an import which has been fully |
| // resolved. We can, therefore, just follow it. |
| if value_result.is_unknown() { |
| value_result = get_binding(self.resolver, |
| import_resolution, |
| ValueNS, |
| &source); |
| value_used_reexport = import_resolution.is_public; |
| } |
| if type_result.is_unknown() { |
| type_result = get_binding(self.resolver, |
| import_resolution, |
| TypeNS, |
| &source); |
| type_used_reexport = import_resolution.is_public; |
| } |
| |
| } |
| Some(_) => { |
| // If target_module is the same module whose import we are resolving |
| // and there it has an unresolved import with the same name as `source`, |
| // then the user is actually trying to import an item that is declared |
| // in the same scope |
| // |
| // e.g |
| // use self::submodule; |
| // pub mod submodule; |
| // |
| // In this case we continue as if we resolved the import and let the |
| // check_for_conflicts_between_imports_and_items call below handle |
| // the conflict |
| match (module_.def_id.get(), target_module.def_id.get()) { |
| (Some(id1), Some(id2)) if id1 == id2 => { |
| if value_result.is_unknown() { |
| value_result = UnboundResult; |
| } |
| if type_result.is_unknown() { |
| type_result = UnboundResult; |
| } |
| } |
| _ => { |
| // The import is unresolved. Bail out. |
| debug!("(resolving single import) unresolved import; \ |
| bailing out"); |
| return ResolveResult::Indeterminate; |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| let mut value_used_public = false; |
| let mut type_used_public = false; |
| |
| // If we didn't find a result in the type namespace, search the |
| // external modules. |
| match type_result { |
| BoundResult(..) => {} |
| _ => { |
| match target_module.external_module_children.borrow_mut().get(&source).cloned() { |
| None => {} // Continue. |
| Some(module) => { |
| debug!("(resolving single import) found external module"); |
| // track the module as used. |
| match module.def_id.get() { |
| Some(DefId{krate: kid, ..}) => { |
| self.resolver.used_crates.insert(kid); |
| } |
| _ => {} |
| } |
| let name_bindings = |
| Rc::new(Resolver::create_name_bindings_from_module(module)); |
| type_result = BoundResult(target_module.clone(), name_bindings); |
| type_used_public = true; |
| } |
| } |
| } |
| } |
| |
| // We've successfully resolved the import. Write the results in. |
| let mut import_resolutions = module_.import_resolutions.borrow_mut(); |
| let import_resolution = import_resolutions.get_mut(&target).unwrap(); |
| |
| { |
| let mut check_and_write_import = |namespace, result: &_, used_public: &mut bool| { |
| let namespace_name = match namespace { |
| TypeNS => "type", |
| ValueNS => "value", |
| }; |
| |
| match *result { |
| BoundResult(ref target_module, ref name_bindings) => { |
| debug!("(resolving single import) found {:?} target: {:?}", |
| namespace_name, |
| name_bindings.def_for_namespace(namespace)); |
| self.check_for_conflicting_import( |
| &import_resolution, |
| directive.span, |
| target, |
| namespace); |
| |
| self.check_that_import_is_importable( |
| &**name_bindings, |
| directive.span, |
| target, |
| namespace); |
| |
| let target = Some(Target::new(target_module.clone(), |
| name_bindings.clone(), |
| directive.shadowable)); |
| import_resolution.set_target_and_id(namespace, target, directive.id); |
| import_resolution.is_public = directive.is_public; |
| *used_public = name_bindings.defined_in_public_namespace(namespace); |
| } |
| UnboundResult => { /* Continue. */ } |
| UnknownResult => { |
| panic!("{:?} result should be known at this point", namespace_name); |
| } |
| } |
| }; |
| check_and_write_import(ValueNS, &value_result, &mut value_used_public); |
| check_and_write_import(TypeNS, &type_result, &mut type_used_public); |
| } |
| |
| self.check_for_conflicts_between_imports_and_items( |
| module_, |
| import_resolution, |
| directive.span, |
| target); |
| |
| if value_result.is_unbound() && type_result.is_unbound() { |
| let msg = format!("There is no `{}` in `{}`", |
| source, |
| module_to_string(&target_module)); |
| return ResolveResult::Failed(Some((directive.span, msg))); |
| } |
| let value_used_public = value_used_reexport || value_used_public; |
| let type_used_public = type_used_reexport || type_used_public; |
| |
| assert!(import_resolution.outstanding_references >= 1); |
| import_resolution.outstanding_references -= 1; |
| |
| // Record what this import resolves to for later uses in documentation, |
| // this may resolve to either a value or a type, but for documentation |
| // purposes it's good enough to just favor one over the other. |
| let value_def_and_priv = import_resolution.value_target.as_ref().map(|target| { |
| let def = target.bindings.def_for_namespace(ValueNS).unwrap(); |
| (def, if value_used_public { lp } else { DependsOn(def.def_id()) }) |
| }); |
| let type_def_and_priv = import_resolution.type_target.as_ref().map(|target| { |
| let def = target.bindings.def_for_namespace(TypeNS).unwrap(); |
| (def, if type_used_public { lp } else { DependsOn(def.def_id()) }) |
| }); |
| |
| let import_lp = LastImport { |
| value_priv: value_def_and_priv.map(|(_, p)| p), |
| value_used: Used, |
| type_priv: type_def_and_priv.map(|(_, p)| p), |
| type_used: Used |
| }; |
| |
| if let Some((def, _)) = value_def_and_priv { |
| self.resolver.def_map.borrow_mut().insert(directive.id, PathResolution { |
| base_def: def, |
| last_private: import_lp, |
| depth: 0 |
| }); |
| } |
| if let Some((def, _)) = type_def_and_priv { |
| self.resolver.def_map.borrow_mut().insert(directive.id, PathResolution { |
| base_def: def, |
| last_private: import_lp, |
| depth: 0 |
| }); |
| } |
| |
| debug!("(resolving single import) successfully resolved import"); |
| return ResolveResult::Success(()); |
| } |
| |
| // Resolves a glob import. Note that this function cannot fail; it either |
| // succeeds or bails out (as importing * from an empty module or a module |
| // that exports nothing is valid). target_module is the module we are |
| // actually importing, i.e., `foo` in `use foo::*`. |
| fn resolve_glob_import(&mut self, |
| module_: &Module, |
| target_module: Rc<Module>, |
| import_directive: &ImportDirective, |
| lp: LastPrivate) |
| -> ResolveResult<()> { |
| let id = import_directive.id; |
| let is_public = import_directive.is_public; |
| |
| // This function works in a highly imperative manner; it eagerly adds |
| // everything it can to the list of import resolutions of the module |
| // node. |
| debug!("(resolving glob import) resolving glob import {}", id); |
| |
| // We must bail out if the node has unresolved imports of any kind |
| // (including globs). |
| if (*target_module).pub_count.get() > 0 { |
| debug!("(resolving glob import) target module has unresolved \ |
| pub imports; bailing out"); |
| return ResolveResult::Indeterminate; |
| } |
| |
| // Add all resolved imports from the containing module. |
| let import_resolutions = target_module.import_resolutions.borrow(); |
| |
| if module_.import_resolutions.borrow_state() != ::std::cell::BorrowState::Unused { |
| // In this case, target_module == module_ |
| // This means we are trying to glob import a module into itself, |
| // and it is a no-go |
| debug!("(resolving glob imports) target module is current module; giving up"); |
| return ResolveResult::Failed(Some(( |
| import_directive.span, |
| "Cannot glob-import a module into itself.".into() |
| ))); |
| } |
| |
| for (ident, target_import_resolution) in import_resolutions.iter() { |
| debug!("(resolving glob import) writing module resolution \ |
| {} into `{}`", |
| *ident, |
| module_to_string(module_)); |
| |
| if !target_import_resolution.is_public { |
| debug!("(resolving glob import) nevermind, just kidding"); |
| continue |
| } |
| |
| // Here we merge two import resolutions. |
| let mut import_resolutions = module_.import_resolutions.borrow_mut(); |
| match import_resolutions.get_mut(ident) { |
| Some(dest_import_resolution) => { |
| // Merge the two import resolutions at a finer-grained |
| // level. |
| |
| match target_import_resolution.value_target { |
| None => { |
| // Continue. |
| } |
| Some(ref value_target) => { |
| self.check_for_conflicting_import(&dest_import_resolution, |
| import_directive.span, |
| *ident, |
| ValueNS); |
| dest_import_resolution.value_target = Some(value_target.clone()); |
| } |
| } |
| match target_import_resolution.type_target { |
| None => { |
| // Continue. |
| } |
| Some(ref type_target) => { |
| self.check_for_conflicting_import(&dest_import_resolution, |
| import_directive.span, |
| *ident, |
| TypeNS); |
| dest_import_resolution.type_target = Some(type_target.clone()); |
| } |
| } |
| dest_import_resolution.is_public = is_public; |
| continue; |
| } |
| None => {} |
| } |
| |
| // Simple: just copy the old import resolution. |
| let mut new_import_resolution = ImportResolution::new(id, is_public); |
| new_import_resolution.value_target = |
| target_import_resolution.value_target.clone(); |
| new_import_resolution.type_target = |
| target_import_resolution.type_target.clone(); |
| |
| import_resolutions.insert(*ident, new_import_resolution); |
| } |
| |
| // Add all children from the containing module. |
| build_reduced_graph::populate_module_if_necessary(self.resolver, &target_module); |
| |
| for (&name, name_bindings) in target_module.children.borrow().iter() { |
| self.merge_import_resolution(module_, |
| target_module.clone(), |
| import_directive, |
| name, |
| name_bindings.clone()); |
| |
| } |
| |
| // Add external module children from the containing module. |
| for (&name, module) in target_module.external_module_children.borrow().iter() { |
| let name_bindings = |
| Rc::new(Resolver::create_name_bindings_from_module(module.clone())); |
| self.merge_import_resolution(module_, |
| target_module.clone(), |
| import_directive, |
| name, |
| name_bindings); |
| } |
| |
| // Record the destination of this import |
| if let Some(did) = target_module.def_id.get() { |
| self.resolver.def_map.borrow_mut().insert(id, PathResolution { |
| base_def: DefMod(did), |
| last_private: lp, |
| depth: 0 |
| }); |
| } |
| |
| debug!("(resolving glob import) successfully resolved import"); |
| return ResolveResult::Success(()); |
| } |
| |
| fn merge_import_resolution(&mut self, |
| module_: &Module, |
| containing_module: Rc<Module>, |
| import_directive: &ImportDirective, |
| name: Name, |
| name_bindings: Rc<NameBindings>) { |
| let id = import_directive.id; |
| let is_public = import_directive.is_public; |
| |
| let mut import_resolutions = module_.import_resolutions.borrow_mut(); |
| let dest_import_resolution = import_resolutions.entry(name) |
| .or_insert_with(|| ImportResolution::new(id, is_public)); |
| |
| debug!("(resolving glob import) writing resolution `{}` in `{}` \ |
| to `{}`", |
| name, |
| module_to_string(&*containing_module), |
| module_to_string(module_)); |
| |
| // Merge the child item into the import resolution. |
| { |
| let mut merge_child_item = |namespace| { |
| let modifier = DefModifiers::IMPORTABLE | DefModifiers::PUBLIC; |
| |
| if name_bindings.defined_in_namespace_with(namespace, modifier) { |
| let namespace_name = match namespace { |
| TypeNS => "type", |
| ValueNS => "value", |
| }; |
| debug!("(resolving glob import) ... for {} target", namespace_name); |
| if dest_import_resolution.shadowable(namespace) == Shadowable::Never { |
| let msg = format!("a {} named `{}` has already been imported \ |
| in this module", |
| namespace_name, |
| name); |
| span_err!(self.resolver.session, import_directive.span, E0251, "{}", msg); |
| } else { |
| let target = Target::new(containing_module.clone(), |
| name_bindings.clone(), |
| import_directive.shadowable); |
| dest_import_resolution.set_target_and_id(namespace, |
| Some(target), |
| id); |
| } |
| } |
| }; |
| merge_child_item(ValueNS); |
| merge_child_item(TypeNS); |
| } |
| |
| dest_import_resolution.is_public = is_public; |
| |
| self.check_for_conflicts_between_imports_and_items( |
| module_, |
| dest_import_resolution, |
| import_directive.span, |
| name); |
| } |
| |
| /// Checks that imported names and items don't have the same name. |
| fn check_for_conflicting_import(&mut self, |
| import_resolution: &ImportResolution, |
| import_span: Span, |
| name: Name, |
| namespace: Namespace) { |
| let target = import_resolution.target_for_namespace(namespace); |
| debug!("check_for_conflicting_import: {}; target exists: {}", |
| name, |
| target.is_some()); |
| |
| match target { |
| Some(ref target) if target.shadowable != Shadowable::Always => { |
| let ns_word = match namespace { |
| TypeNS => { |
| if let Some(ref ty_def) = *target.bindings.type_def.borrow() { |
| match ty_def.module_def { |
| Some(ref module) |
| if module.kind.get() == ModuleKind::NormalModuleKind => |
| "module", |
| Some(ref module) |
| if module.kind.get() == ModuleKind::TraitModuleKind => |
| "trait", |
| _ => "type", |
| } |
| } else { "type" } |
| }, |
| ValueNS => "value", |
| }; |
| span_err!(self.resolver.session, import_span, E0252, |
| "a {} named `{}` has already been imported \ |
| in this module", ns_word, |
| name); |
| let use_id = import_resolution.id(namespace); |
| let item = self.resolver.ast_map.expect_item(use_id); |
| // item is syntax::ast::Item; |
| span_note!(self.resolver.session, item.span, |
| "previous import of `{}` here", |
| name); |
| } |
| Some(_) | None => {} |
| } |
| } |
| |
| /// Checks that an import is actually importable |
| fn check_that_import_is_importable(&mut self, |
| name_bindings: &NameBindings, |
| import_span: Span, |
| name: Name, |
| namespace: Namespace) { |
| if !name_bindings.defined_in_namespace_with(namespace, DefModifiers::IMPORTABLE) { |
| let msg = format!("`{}` is not directly importable", |
| name); |
| span_err!(self.resolver.session, import_span, E0253, "{}", &msg[..]); |
| } |
| } |
| |
| /// Checks that imported names and items don't have the same name. |
| fn check_for_conflicts_between_imports_and_items(&mut self, |
| module: &Module, |
| import_resolution: |
| &ImportResolution, |
| import_span: Span, |
| name: Name) { |
| // First, check for conflicts between imports and `extern crate`s. |
| if module.external_module_children |
| .borrow() |
| .contains_key(&name) { |
| match import_resolution.type_target { |
| Some(ref target) if target.shadowable != Shadowable::Always => { |
| let msg = format!("import `{0}` conflicts with imported \ |
| crate in this module \ |
| (maybe you meant `use {0}::*`?)", |
| name); |
| span_err!(self.resolver.session, import_span, E0254, "{}", &msg[..]); |
| } |
| Some(_) | None => {} |
| } |
| } |
| |
| // Check for item conflicts. |
| let children = module.children.borrow(); |
| let name_bindings = match children.get(&name) { |
| None => { |
| // There can't be any conflicts. |
| return |
| } |
| Some(ref name_bindings) => (*name_bindings).clone(), |
| }; |
| |
| match import_resolution.value_target { |
| Some(ref target) if target.shadowable != Shadowable::Always => { |
| if let Some(ref value) = *name_bindings.value_def.borrow() { |
| span_err!(self.resolver.session, import_span, E0255, |
| "import `{}` conflicts with value in this module", |
| name); |
| if let Some(span) = value.value_span { |
| self.resolver.session.span_note(span, "conflicting value here"); |
| } |
| } |
| } |
| Some(_) | None => {} |
| } |
| |
| match import_resolution.type_target { |
| Some(ref target) if target.shadowable != Shadowable::Always => { |
| if let Some(ref ty) = *name_bindings.type_def.borrow() { |
| let (what, note) = match ty.module_def { |
| Some(ref module) |
| if module.kind.get() == ModuleKind::NormalModuleKind => |
| ("existing submodule", "note conflicting module here"), |
| Some(ref module) |
| if module.kind.get() == ModuleKind::TraitModuleKind => |
| ("trait in this module", "note conflicting trait here"), |
| _ => ("type in this module", "note conflicting type here"), |
| }; |
| span_err!(self.resolver.session, import_span, E0256, |
| "import `{}` conflicts with {}", |
| name, what); |
| if let Some(span) = ty.type_span { |
| self.resolver.session.span_note(span, note); |
| } |
| } |
| } |
| Some(_) | None => {} |
| } |
| } |
| } |
| |
| fn import_path_to_string(names: &[Name], |
| subclass: ImportDirectiveSubclass) |
| -> String { |
| if names.is_empty() { |
| import_directive_subclass_to_string(subclass) |
| } else { |
| (format!("{}::{}", |
| names_to_string(names), |
| import_directive_subclass_to_string(subclass))).to_string() |
| } |
| } |
| |
| fn import_directive_subclass_to_string(subclass: ImportDirectiveSubclass) -> String { |
| match subclass { |
| SingleImport(_, source) => source.to_string(), |
| GlobImport => "*".to_string() |
| } |
| } |
| |
| pub fn resolve_imports(resolver: &mut Resolver) { |
| let mut import_resolver = ImportResolver { |
| resolver: resolver, |
| }; |
| import_resolver.resolve_imports(); |
| } |
