| // Copyright 2012-2014 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. |
| |
| //! Reduced graph building |
| //! |
| //! Here we build the "reduced graph": the graph of the module tree without |
| //! any imports resolved. |
| |
| use macros::{InvocationData, ParentScope, LegacyScope}; |
| use resolve_imports::ImportDirective; |
| use resolve_imports::ImportDirectiveSubclass::{self, GlobImport, SingleImport}; |
| use {Module, ModuleData, ModuleKind, NameBinding, NameBindingKind, Segment, ToNameBinding}; |
| use {ModuleOrUniformRoot, PerNS, Resolver, ResolverArenas, ExternPreludeEntry}; |
| use Namespace::{self, TypeNS, ValueNS, MacroNS}; |
| use {resolve_error, resolve_struct_error, ResolutionError}; |
| |
| use rustc::hir::def::*; |
| use rustc::hir::def_id::{CrateNum, CRATE_DEF_INDEX, LOCAL_CRATE, DefId}; |
| use rustc::ty; |
| use rustc::middle::cstore::CrateStore; |
| use rustc_metadata::cstore::LoadedMacro; |
| |
| use std::cell::Cell; |
| use std::ptr; |
| use rustc_data_structures::sync::Lrc; |
| |
| use syntax::ast::{Name, Ident}; |
| use syntax::attr; |
| |
| use syntax::ast::{self, Block, ForeignItem, ForeignItemKind, Item, ItemKind, NodeId}; |
| use syntax::ast::{MetaItemKind, Mutability, StmtKind, TraitItem, TraitItemKind, Variant}; |
| use syntax::ext::base::{MacroKind, SyntaxExtension}; |
| use syntax::ext::base::Determinacy::Undetermined; |
| use syntax::ext::hygiene::Mark; |
| use syntax::ext::tt::macro_rules; |
| use syntax::feature_gate::{is_builtin_attr, emit_feature_err, GateIssue}; |
| use syntax::parse::token::{self, Token}; |
| use syntax::std_inject::injected_crate_name; |
| use syntax::symbol::keywords; |
| use syntax::visit::{self, Visitor}; |
| |
| use syntax_pos::{Span, DUMMY_SP}; |
| |
| impl<'a> ToNameBinding<'a> for (Module<'a>, ty::Visibility, Span, Mark) { |
| fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> { |
| arenas.alloc_name_binding(NameBinding { |
| kind: NameBindingKind::Module(self.0), |
| vis: self.1, |
| span: self.2, |
| expansion: self.3, |
| }) |
| } |
| } |
| |
| impl<'a> ToNameBinding<'a> for (Def, ty::Visibility, Span, Mark) { |
| fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> { |
| arenas.alloc_name_binding(NameBinding { |
| kind: NameBindingKind::Def(self.0, false), |
| vis: self.1, |
| span: self.2, |
| expansion: self.3, |
| }) |
| } |
| } |
| |
| pub(crate) struct IsMacroExport; |
| |
| impl<'a> ToNameBinding<'a> for (Def, ty::Visibility, Span, Mark, IsMacroExport) { |
| fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> { |
| arenas.alloc_name_binding(NameBinding { |
| kind: NameBindingKind::Def(self.0, true), |
| vis: self.1, |
| span: self.2, |
| expansion: self.3, |
| }) |
| } |
| } |
| |
| impl<'a, 'cl> Resolver<'a, 'cl> { |
| /// Defines `name` in namespace `ns` of module `parent` to be `def` if it is not yet defined; |
| /// otherwise, reports an error. |
| pub fn define<T>(&mut self, parent: Module<'a>, ident: Ident, ns: Namespace, def: T) |
| where T: ToNameBinding<'a>, |
| { |
| let binding = def.to_name_binding(self.arenas); |
| if let Err(old_binding) = self.try_define(parent, ident, ns, binding) { |
| self.report_conflict(parent, ident, ns, old_binding, &binding); |
| } |
| } |
| |
| fn block_needs_anonymous_module(&mut self, block: &Block) -> bool { |
| // If any statements are items, we need to create an anonymous module |
| block.stmts.iter().any(|statement| match statement.node { |
| StmtKind::Item(_) | StmtKind::Mac(_) => true, |
| _ => false, |
| }) |
| } |
| |
| fn insert_field_names(&mut self, def_id: DefId, field_names: Vec<Name>) { |
| if !field_names.is_empty() { |
| self.field_names.insert(def_id, field_names); |
| } |
| } |
| |
| fn build_reduced_graph_for_use_tree( |
| &mut self, |
| // This particular use tree |
| use_tree: &ast::UseTree, |
| id: NodeId, |
| parent_prefix: &[Segment], |
| nested: bool, |
| // The whole `use` item |
| parent_scope: ParentScope<'a>, |
| item: &Item, |
| vis: ty::Visibility, |
| root_span: Span, |
| ) { |
| debug!("build_reduced_graph_for_use_tree(parent_prefix={:?}, use_tree={:?}, nested={})", |
| parent_prefix, use_tree, nested); |
| |
| let mut prefix_iter = parent_prefix.iter().cloned() |
| .chain(use_tree.prefix.segments.iter().map(|seg| seg.into())).peekable(); |
| |
| // On 2015 edition imports are resolved as crate-relative by default, |
| // so prefixes are prepended with crate root segment if necessary. |
| // The root is prepended lazily, when the first non-empty prefix or terminating glob |
| // appears, so imports in braced groups can have roots prepended independently. |
| // 2015 identifiers used on global 2018 edition enter special "virtual 2015 mode", don't |
| // get crate root prepended, but get special treatment during in-scope resolution instead. |
| let is_glob = if let ast::UseTreeKind::Glob = use_tree.kind { true } else { false }; |
| let crate_root = match prefix_iter.peek() { |
| Some(seg) if !seg.ident.is_path_segment_keyword() && |
| seg.ident.span.rust_2015() && self.session.rust_2015() => { |
| Some(seg.ident.span.ctxt()) |
| } |
| None if is_glob && use_tree.span.rust_2015() => { |
| Some(use_tree.span.ctxt()) |
| } |
| _ => None, |
| }.map(|ctxt| Segment::from_ident(Ident::new( |
| keywords::CrateRoot.name(), use_tree.prefix.span.shrink_to_lo().with_ctxt(ctxt) |
| ))); |
| |
| let prefix = crate_root.into_iter().chain(prefix_iter).collect::<Vec<_>>(); |
| debug!("build_reduced_graph_for_use_tree: prefix={:?}", prefix); |
| |
| let empty_for_self = |prefix: &[Segment]| { |
| prefix.is_empty() || |
| prefix.len() == 1 && prefix[0].ident.name == keywords::CrateRoot.name() |
| }; |
| match use_tree.kind { |
| ast::UseTreeKind::Simple(rename, ..) => { |
| let mut ident = use_tree.ident(); |
| let mut module_path = prefix; |
| let mut source = module_path.pop().unwrap(); |
| let mut type_ns_only = false; |
| |
| if nested { |
| // Correctly handle `self` |
| if source.ident.name == keywords::SelfValue.name() { |
| type_ns_only = true; |
| |
| if empty_for_self(&module_path) { |
| resolve_error( |
| self, |
| use_tree.span, |
| ResolutionError:: |
| SelfImportOnlyInImportListWithNonEmptyPrefix |
| ); |
| return; |
| } |
| |
| // Replace `use foo::self;` with `use foo;` |
| source = module_path.pop().unwrap(); |
| if rename.is_none() { |
| ident = source.ident; |
| } |
| } |
| } else { |
| // Disallow `self` |
| if source.ident.name == keywords::SelfValue.name() { |
| resolve_error(self, |
| use_tree.span, |
| ResolutionError::SelfImportsOnlyAllowedWithin); |
| } |
| |
| // Disallow `use $crate;` |
| if source.ident.name == keywords::DollarCrate.name() && module_path.is_empty() { |
| let crate_root = self.resolve_crate_root(source.ident); |
| let crate_name = match crate_root.kind { |
| ModuleKind::Def(_, name) => name, |
| ModuleKind::Block(..) => unreachable!(), |
| }; |
| // HACK(eddyb) unclear how good this is, but keeping `$crate` |
| // in `source` breaks `src/test/compile-fail/import-crate-var.rs`, |
| // while the current crate doesn't have a valid `crate_name`. |
| if crate_name != keywords::Invalid.name() { |
| // `crate_name` should not be interpreted as relative. |
| module_path.push(Segment { |
| ident: Ident { |
| name: keywords::CrateRoot.name(), |
| span: source.ident.span, |
| }, |
| id: Some(self.session.next_node_id()), |
| }); |
| source.ident.name = crate_name; |
| } |
| if rename.is_none() { |
| ident.name = crate_name; |
| } |
| |
| self.session.struct_span_warn(item.span, "`$crate` may not be imported") |
| .note("`use $crate;` was erroneously allowed and \ |
| will become a hard error in a future release") |
| .emit(); |
| } |
| } |
| |
| if ident.name == keywords::Crate.name() { |
| self.session.span_err(ident.span, |
| "crate root imports need to be explicitly named: \ |
| `use crate as name;`"); |
| } |
| |
| let subclass = SingleImport { |
| target: ident, |
| source: source.ident, |
| result: PerNS { |
| type_ns: Cell::new(Err(Undetermined)), |
| value_ns: Cell::new(Err(Undetermined)), |
| macro_ns: Cell::new(Err(Undetermined)), |
| }, |
| type_ns_only, |
| }; |
| self.add_import_directive( |
| module_path, |
| subclass, |
| use_tree.span, |
| id, |
| root_span, |
| item.id, |
| vis, |
| parent_scope, |
| ); |
| } |
| ast::UseTreeKind::Glob => { |
| let subclass = GlobImport { |
| is_prelude: attr::contains_name(&item.attrs, "prelude_import"), |
| max_vis: Cell::new(ty::Visibility::Invisible), |
| }; |
| self.add_import_directive( |
| prefix, |
| subclass, |
| use_tree.span, |
| id, |
| root_span, |
| item.id, |
| vis, |
| parent_scope, |
| ); |
| } |
| ast::UseTreeKind::Nested(ref items) => { |
| // Ensure there is at most one `self` in the list |
| let self_spans = items.iter().filter_map(|&(ref use_tree, _)| { |
| if let ast::UseTreeKind::Simple(..) = use_tree.kind { |
| if use_tree.ident().name == keywords::SelfValue.name() { |
| return Some(use_tree.span); |
| } |
| } |
| |
| None |
| }).collect::<Vec<_>>(); |
| if self_spans.len() > 1 { |
| let mut e = resolve_struct_error(self, |
| self_spans[0], |
| ResolutionError::SelfImportCanOnlyAppearOnceInTheList); |
| |
| for other_span in self_spans.iter().skip(1) { |
| e.span_label(*other_span, "another `self` import appears here"); |
| } |
| |
| e.emit(); |
| } |
| |
| for &(ref tree, id) in items { |
| self.build_reduced_graph_for_use_tree( |
| // This particular use tree |
| tree, id, &prefix, true, |
| // The whole `use` item |
| parent_scope.clone(), item, vis, root_span, |
| ); |
| } |
| |
| // Empty groups `a::b::{}` are turned into synthetic `self` imports |
| // `a::b::c::{self as _}`, so that their prefixes are correctly |
| // resolved and checked for privacy/stability/etc. |
| if items.is_empty() && !empty_for_self(&prefix) { |
| let new_span = prefix[prefix.len() - 1].ident.span; |
| let tree = ast::UseTree { |
| prefix: ast::Path::from_ident( |
| Ident::new(keywords::SelfValue.name(), new_span) |
| ), |
| kind: ast::UseTreeKind::Simple( |
| Some(Ident::new(keywords::Underscore.name().gensymed(), new_span)), |
| ast::DUMMY_NODE_ID, |
| ast::DUMMY_NODE_ID, |
| ), |
| span: use_tree.span, |
| }; |
| self.build_reduced_graph_for_use_tree( |
| // This particular use tree |
| &tree, id, &prefix, true, |
| // The whole `use` item |
| parent_scope.clone(), item, ty::Visibility::Invisible, root_span, |
| ); |
| } |
| } |
| } |
| } |
| |
| /// Constructs the reduced graph for one item. |
| fn build_reduced_graph_for_item(&mut self, item: &Item, parent_scope: ParentScope<'a>) { |
| let parent = parent_scope.module; |
| let expansion = parent_scope.expansion; |
| let ident = item.ident; |
| let sp = item.span; |
| let vis = self.resolve_visibility(&item.vis); |
| |
| match item.node { |
| ItemKind::Use(ref use_tree) => { |
| self.build_reduced_graph_for_use_tree( |
| // This particular use tree |
| use_tree, item.id, &[], false, |
| // The whole `use` item |
| parent_scope, item, vis, use_tree.span, |
| ); |
| } |
| |
| ItemKind::ExternCrate(orig_name) => { |
| let module = if orig_name.is_none() && ident.name == keywords::SelfValue.name() { |
| self.session |
| .struct_span_err(item.span, "`extern crate self;` requires renaming") |
| .span_suggestion(item.span, "try", "extern crate self as name;".into()) |
| .emit(); |
| return; |
| } else if orig_name == Some(keywords::SelfValue.name()) { |
| if !self.session.features_untracked().extern_crate_self { |
| emit_feature_err(&self.session.parse_sess, "extern_crate_self", item.span, |
| GateIssue::Language, "`extern crate self` is unstable"); |
| } |
| self.graph_root |
| } else { |
| let crate_id = self.crate_loader.process_extern_crate(item, &self.definitions); |
| self.get_module(DefId { krate: crate_id, index: CRATE_DEF_INDEX }) |
| }; |
| |
| self.populate_module_if_necessary(module); |
| if injected_crate_name().map_or(false, |name| ident.name == name) { |
| self.injected_crate = Some(module); |
| } |
| |
| let used = self.process_legacy_macro_imports(item, module, &parent_scope); |
| let binding = |
| (module, ty::Visibility::Public, sp, expansion).to_name_binding(self.arenas); |
| let directive = self.arenas.alloc_import_directive(ImportDirective { |
| root_id: item.id, |
| id: item.id, |
| parent_scope, |
| imported_module: Cell::new(Some(ModuleOrUniformRoot::Module(module))), |
| subclass: ImportDirectiveSubclass::ExternCrate { |
| source: orig_name, |
| target: ident, |
| }, |
| root_span: item.span, |
| span: item.span, |
| module_path: Vec::new(), |
| vis: Cell::new(vis), |
| used: Cell::new(used), |
| }); |
| self.potentially_unused_imports.push(directive); |
| let imported_binding = self.import(binding, directive); |
| if ptr::eq(self.current_module, self.graph_root) { |
| if let Some(entry) = self.extern_prelude.get(&ident.modern()) { |
| if expansion != Mark::root() && orig_name.is_some() && |
| entry.extern_crate_item.is_none() { |
| self.session.span_err(item.span, "macro-expanded `extern crate` items \ |
| cannot shadow names passed with \ |
| `--extern`"); |
| } |
| } |
| let entry = self.extern_prelude.entry(ident.modern()) |
| .or_insert(ExternPreludeEntry { |
| extern_crate_item: None, |
| introduced_by_item: true, |
| }); |
| entry.extern_crate_item = Some(imported_binding); |
| if orig_name.is_some() { |
| entry.introduced_by_item = true; |
| } |
| } |
| self.define(parent, ident, TypeNS, imported_binding); |
| } |
| |
| ItemKind::GlobalAsm(..) => {} |
| |
| ItemKind::Mod(..) if ident == keywords::Invalid.ident() => {} // Crate root |
| |
| ItemKind::Mod(..) => { |
| let def_id = self.definitions.local_def_id(item.id); |
| let module_kind = ModuleKind::Def(Def::Mod(def_id), ident.name); |
| let module = self.arenas.alloc_module(ModuleData { |
| no_implicit_prelude: parent.no_implicit_prelude || { |
| attr::contains_name(&item.attrs, "no_implicit_prelude") |
| }, |
| ..ModuleData::new(Some(parent), module_kind, def_id, expansion, item.span) |
| }); |
| self.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
| self.module_map.insert(def_id, module); |
| |
| // Descend into the module. |
| self.current_module = module; |
| } |
| |
| // Handled in `rustc_metadata::{native_libs,link_args}` |
| ItemKind::ForeignMod(..) => {} |
| |
| // These items live in the value namespace. |
| ItemKind::Static(_, m, _) => { |
| let mutbl = m == Mutability::Mutable; |
| let def = Def::Static(self.definitions.local_def_id(item.id), mutbl); |
| self.define(parent, ident, ValueNS, (def, vis, sp, expansion)); |
| } |
| ItemKind::Const(..) => { |
| let def = Def::Const(self.definitions.local_def_id(item.id)); |
| self.define(parent, ident, ValueNS, (def, vis, sp, expansion)); |
| } |
| ItemKind::Fn(..) => { |
| let def = Def::Fn(self.definitions.local_def_id(item.id)); |
| self.define(parent, ident, ValueNS, (def, vis, sp, expansion)); |
| |
| // Functions introducing procedural macros reserve a slot |
| // in the macro namespace as well (see #52225). |
| if attr::contains_name(&item.attrs, "proc_macro") || |
| attr::contains_name(&item.attrs, "proc_macro_attribute") { |
| let def = Def::Macro(def.def_id(), MacroKind::ProcMacroStub); |
| self.define(parent, ident, MacroNS, (def, vis, sp, expansion)); |
| } |
| if let Some(attr) = attr::find_by_name(&item.attrs, "proc_macro_derive") { |
| if let Some(trait_attr) = |
| attr.meta_item_list().and_then(|list| list.get(0).cloned()) { |
| if let Some(ident) = trait_attr.name().map(Ident::with_empty_ctxt) { |
| let sp = trait_attr.span; |
| let def = Def::Macro(def.def_id(), MacroKind::ProcMacroStub); |
| self.define(parent, ident, MacroNS, (def, vis, sp, expansion)); |
| } |
| } |
| } |
| } |
| |
| // These items live in the type namespace. |
| ItemKind::Ty(..) => { |
| let def = Def::TyAlias(self.definitions.local_def_id(item.id)); |
| self.define(parent, ident, TypeNS, (def, vis, sp, expansion)); |
| } |
| |
| ItemKind::Existential(_, _) => { |
| let def = Def::Existential(self.definitions.local_def_id(item.id)); |
| self.define(parent, ident, TypeNS, (def, vis, sp, expansion)); |
| } |
| |
| ItemKind::Enum(ref enum_definition, _) => { |
| let def = Def::Enum(self.definitions.local_def_id(item.id)); |
| let module_kind = ModuleKind::Def(def, ident.name); |
| let module = self.new_module(parent, |
| module_kind, |
| parent.normal_ancestor_id, |
| expansion, |
| item.span); |
| self.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
| |
| for variant in &(*enum_definition).variants { |
| self.build_reduced_graph_for_variant(variant, module, vis, expansion); |
| } |
| } |
| |
| ItemKind::TraitAlias(..) => { |
| let def = Def::TraitAlias(self.definitions.local_def_id(item.id)); |
| self.define(parent, ident, TypeNS, (def, vis, sp, expansion)); |
| } |
| |
| // These items live in both the type and value namespaces. |
| ItemKind::Struct(ref struct_def, _) => { |
| // Define a name in the type namespace. |
| let def_id = self.definitions.local_def_id(item.id); |
| let def = Def::Struct(def_id); |
| self.define(parent, ident, TypeNS, (def, vis, sp, expansion)); |
| |
| let mut ctor_vis = vis; |
| |
| let has_non_exhaustive = attr::contains_name(&item.attrs, "non_exhaustive"); |
| |
| // If the structure is marked as non_exhaustive then lower the visibility |
| // to within the crate. |
| if has_non_exhaustive && vis == ty::Visibility::Public { |
| ctor_vis = ty::Visibility::Restricted(DefId::local(CRATE_DEF_INDEX)); |
| } |
| |
| // Record field names for error reporting. |
| let field_names = struct_def.fields().iter().filter_map(|field| { |
| let field_vis = self.resolve_visibility(&field.vis); |
| if ctor_vis.is_at_least(field_vis, &*self) { |
| ctor_vis = field_vis; |
| } |
| field.ident.map(|ident| ident.name) |
| }).collect(); |
| let item_def_id = self.definitions.local_def_id(item.id); |
| self.insert_field_names(item_def_id, field_names); |
| |
| // If this is a tuple or unit struct, define a name |
| // in the value namespace as well. |
| if !struct_def.is_struct() { |
| let ctor_def = Def::StructCtor(self.definitions.local_def_id(struct_def.id()), |
| CtorKind::from_ast(struct_def)); |
| self.define(parent, ident, ValueNS, (ctor_def, ctor_vis, sp, expansion)); |
| self.struct_constructors.insert(def.def_id(), (ctor_def, ctor_vis)); |
| } |
| } |
| |
| ItemKind::Union(ref vdata, _) => { |
| let def = Def::Union(self.definitions.local_def_id(item.id)); |
| self.define(parent, ident, TypeNS, (def, vis, sp, expansion)); |
| |
| // Record field names for error reporting. |
| let field_names = vdata.fields().iter().filter_map(|field| { |
| self.resolve_visibility(&field.vis); |
| field.ident.map(|ident| ident.name) |
| }).collect(); |
| let item_def_id = self.definitions.local_def_id(item.id); |
| self.insert_field_names(item_def_id, field_names); |
| } |
| |
| ItemKind::Impl(..) => {} |
| |
| ItemKind::Trait(..) => { |
| let def_id = self.definitions.local_def_id(item.id); |
| |
| // Add all the items within to a new module. |
| let module_kind = ModuleKind::Def(Def::Trait(def_id), ident.name); |
| let module = self.new_module(parent, |
| module_kind, |
| parent.normal_ancestor_id, |
| expansion, |
| item.span); |
| self.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
| self.current_module = module; |
| } |
| |
| ItemKind::MacroDef(..) | ItemKind::Mac(_) => unreachable!(), |
| } |
| } |
| |
| // Constructs the reduced graph for one variant. Variants exist in the |
| // type and value namespaces. |
| fn build_reduced_graph_for_variant(&mut self, |
| variant: &Variant, |
| parent: Module<'a>, |
| vis: ty::Visibility, |
| expansion: Mark) { |
| let ident = variant.node.ident; |
| let def_id = self.definitions.local_def_id(variant.node.data.id()); |
| |
| // Define a name in the type namespace. |
| let def = Def::Variant(def_id); |
| self.define(parent, ident, TypeNS, (def, vis, variant.span, expansion)); |
| |
| // Define a constructor name in the value namespace. |
| // Braced variants, unlike structs, generate unusable names in |
| // value namespace, they are reserved for possible future use. |
| let ctor_kind = CtorKind::from_ast(&variant.node.data); |
| let ctor_def = Def::VariantCtor(def_id, ctor_kind); |
| |
| self.define(parent, ident, ValueNS, (ctor_def, vis, variant.span, expansion)); |
| } |
| |
| /// Constructs the reduced graph for one foreign item. |
| fn build_reduced_graph_for_foreign_item(&mut self, item: &ForeignItem, expansion: Mark) { |
| let (def, ns) = match item.node { |
| ForeignItemKind::Fn(..) => { |
| (Def::Fn(self.definitions.local_def_id(item.id)), ValueNS) |
| } |
| ForeignItemKind::Static(_, m) => { |
| (Def::Static(self.definitions.local_def_id(item.id), m), ValueNS) |
| } |
| ForeignItemKind::Ty => { |
| (Def::ForeignTy(self.definitions.local_def_id(item.id)), TypeNS) |
| } |
| ForeignItemKind::Macro(_) => unreachable!(), |
| }; |
| let parent = self.current_module; |
| let vis = self.resolve_visibility(&item.vis); |
| self.define(parent, item.ident, ns, (def, vis, item.span, expansion)); |
| } |
| |
| fn build_reduced_graph_for_block(&mut self, block: &Block, expansion: Mark) { |
| let parent = self.current_module; |
| if self.block_needs_anonymous_module(block) { |
| let module = self.new_module(parent, |
| ModuleKind::Block(block.id), |
| parent.normal_ancestor_id, |
| expansion, |
| block.span); |
| self.block_map.insert(block.id, module); |
| self.current_module = module; // Descend into the block. |
| } |
| } |
| |
| /// Builds the reduced graph for a single item in an external crate. |
| fn build_reduced_graph_for_external_crate_def(&mut self, parent: Module<'a>, child: Export) { |
| let Export { ident, def, vis, span, .. } = child; |
| let def_id = def.def_id(); |
| let expansion = Mark::root(); // FIXME(jseyfried) intercrate hygiene |
| match def { |
| Def::Mod(..) | Def::Enum(..) => { |
| let module = self.new_module(parent, |
| ModuleKind::Def(def, ident.name), |
| def_id, |
| expansion, |
| span); |
| self.define(parent, ident, TypeNS, (module, vis, DUMMY_SP, expansion)); |
| } |
| Def::Variant(..) | Def::TyAlias(..) | Def::ForeignTy(..) => { |
| self.define(parent, ident, TypeNS, (def, vis, DUMMY_SP, expansion)); |
| } |
| Def::Fn(..) | Def::Static(..) | Def::Const(..) | Def::VariantCtor(..) => { |
| self.define(parent, ident, ValueNS, (def, vis, DUMMY_SP, expansion)); |
| } |
| Def::StructCtor(..) => { |
| self.define(parent, ident, ValueNS, (def, vis, DUMMY_SP, expansion)); |
| |
| if let Some(struct_def_id) = |
| self.cstore.def_key(def_id).parent |
| .map(|index| DefId { krate: def_id.krate, index: index }) { |
| self.struct_constructors.insert(struct_def_id, (def, vis)); |
| } |
| } |
| Def::Trait(..) => { |
| let module_kind = ModuleKind::Def(def, ident.name); |
| let module = self.new_module(parent, |
| module_kind, |
| parent.normal_ancestor_id, |
| expansion, |
| span); |
| self.define(parent, ident, TypeNS, (module, vis, DUMMY_SP, expansion)); |
| |
| for child in self.cstore.item_children_untracked(def_id, self.session) { |
| let ns = if let Def::AssociatedTy(..) = child.def { TypeNS } else { ValueNS }; |
| self.define(module, child.ident, ns, |
| (child.def, ty::Visibility::Public, DUMMY_SP, expansion)); |
| |
| if self.cstore.associated_item_cloned_untracked(child.def.def_id()) |
| .method_has_self_argument { |
| self.has_self.insert(child.def.def_id()); |
| } |
| } |
| module.populated.set(true); |
| } |
| Def::Struct(..) | Def::Union(..) => { |
| self.define(parent, ident, TypeNS, (def, vis, DUMMY_SP, expansion)); |
| |
| // Record field names for error reporting. |
| let field_names = self.cstore.struct_field_names_untracked(def_id); |
| self.insert_field_names(def_id, field_names); |
| } |
| Def::Macro(..) => { |
| self.define(parent, ident, MacroNS, (def, vis, DUMMY_SP, expansion)); |
| } |
| _ => bug!("unexpected definition: {:?}", def) |
| } |
| } |
| |
| pub fn get_module(&mut self, def_id: DefId) -> Module<'a> { |
| if def_id.krate == LOCAL_CRATE { |
| return self.module_map[&def_id] |
| } |
| |
| let macros_only = self.cstore.dep_kind_untracked(def_id.krate).macros_only(); |
| if let Some(&module) = self.extern_module_map.get(&(def_id, macros_only)) { |
| return module; |
| } |
| |
| let (name, parent) = if def_id.index == CRATE_DEF_INDEX { |
| (self.cstore.crate_name_untracked(def_id.krate).as_interned_str(), None) |
| } else { |
| let def_key = self.cstore.def_key(def_id); |
| (def_key.disambiguated_data.data.get_opt_name().unwrap(), |
| Some(self.get_module(DefId { index: def_key.parent.unwrap(), ..def_id }))) |
| }; |
| |
| let kind = ModuleKind::Def(Def::Mod(def_id), name.as_symbol()); |
| let module = |
| self.arenas.alloc_module(ModuleData::new(parent, kind, def_id, Mark::root(), DUMMY_SP)); |
| self.extern_module_map.insert((def_id, macros_only), module); |
| module |
| } |
| |
| pub fn macro_def_scope(&mut self, expansion: Mark) -> Module<'a> { |
| let def_id = self.macro_defs[&expansion]; |
| if let Some(id) = self.definitions.as_local_node_id(def_id) { |
| self.local_macro_def_scopes[&id] |
| } else if def_id.krate == CrateNum::BuiltinMacros { |
| self.injected_crate.unwrap_or(self.graph_root) |
| } else { |
| let module_def_id = ty::DefIdTree::parent(&*self, def_id).unwrap(); |
| self.get_module(module_def_id) |
| } |
| } |
| |
| pub fn get_macro(&mut self, def: Def) -> Lrc<SyntaxExtension> { |
| let def_id = match def { |
| Def::Macro(def_id, ..) => def_id, |
| Def::NonMacroAttr(attr_kind) => return Lrc::new(SyntaxExtension::NonMacroAttr { |
| mark_used: attr_kind == NonMacroAttrKind::Tool, |
| }), |
| _ => panic!("expected `Def::Macro` or `Def::NonMacroAttr`"), |
| }; |
| if let Some(ext) = self.macro_map.get(&def_id) { |
| return ext.clone(); |
| } |
| |
| let macro_def = match self.cstore.load_macro_untracked(def_id, &self.session) { |
| LoadedMacro::MacroDef(macro_def) => macro_def, |
| LoadedMacro::ProcMacro(ext) => return ext, |
| }; |
| |
| let ext = Lrc::new(macro_rules::compile(&self.session.parse_sess, |
| &self.session.features_untracked(), |
| ¯o_def, |
| self.cstore.crate_edition_untracked(def_id.krate))); |
| self.macro_map.insert(def_id, ext.clone()); |
| ext |
| } |
| |
| /// Ensures that the reduced graph rooted at the given external module |
| /// is built, building it if it is not. |
| pub fn populate_module_if_necessary(&mut self, module: Module<'a>) { |
| if module.populated.get() { return } |
| let def_id = module.def_id().unwrap(); |
| for child in self.cstore.item_children_untracked(def_id, self.session) { |
| self.build_reduced_graph_for_external_crate_def(module, child); |
| } |
| module.populated.set(true) |
| } |
| |
| fn legacy_import_macro(&mut self, |
| name: Name, |
| binding: &'a NameBinding<'a>, |
| span: Span, |
| allow_shadowing: bool) { |
| if self.macro_use_prelude.insert(name, binding).is_some() && !allow_shadowing { |
| let msg = format!("`{}` is already in scope", name); |
| let note = |
| "macro-expanded `#[macro_use]`s may not shadow existing macros (see RFC 1560)"; |
| self.session.struct_span_err(span, &msg).note(note).emit(); |
| } |
| } |
| |
| // This returns true if we should consider the underlying `extern crate` to be used. |
| fn process_legacy_macro_imports(&mut self, item: &Item, module: Module<'a>, |
| parent_scope: &ParentScope<'a>) -> bool { |
| let mut import_all = None; |
| let mut single_imports = Vec::new(); |
| for attr in &item.attrs { |
| if attr.check_name("macro_use") { |
| if self.current_module.parent.is_some() { |
| span_err!(self.session, item.span, E0468, |
| "an `extern crate` loading macros must be at the crate root"); |
| } |
| if let ItemKind::ExternCrate(Some(orig_name)) = item.node { |
| if orig_name == keywords::SelfValue.name() { |
| self.session.span_err(attr.span, |
| "`macro_use` is not supported on `extern crate self`"); |
| } |
| } |
| let ill_formed = |span| span_err!(self.session, span, E0466, "bad macro import"); |
| match attr.meta() { |
| Some(meta) => match meta.node { |
| MetaItemKind::Word => { |
| import_all = Some(meta.span); |
| break; |
| } |
| MetaItemKind::List(nested_metas) => for nested_meta in nested_metas { |
| match nested_meta.word() { |
| Some(word) => single_imports.push((word.name(), word.span)), |
| None => ill_formed(nested_meta.span), |
| } |
| } |
| MetaItemKind::NameValue(..) => ill_formed(meta.span), |
| } |
| None => ill_formed(attr.span()), |
| } |
| } |
| } |
| |
| let arenas = self.arenas; |
| let macro_use_directive = |span| arenas.alloc_import_directive(ImportDirective { |
| root_id: item.id, |
| id: item.id, |
| parent_scope: parent_scope.clone(), |
| imported_module: Cell::new(Some(ModuleOrUniformRoot::Module(module))), |
| subclass: ImportDirectiveSubclass::MacroUse, |
| root_span: span, |
| span, |
| module_path: Vec::new(), |
| vis: Cell::new(ty::Visibility::Restricted(DefId::local(CRATE_DEF_INDEX))), |
| used: Cell::new(false), |
| }); |
| |
| let allow_shadowing = parent_scope.expansion == Mark::root(); |
| if let Some(span) = import_all { |
| let directive = macro_use_directive(span); |
| self.potentially_unused_imports.push(directive); |
| module.for_each_child(|ident, ns, binding| if ns == MacroNS { |
| let imported_binding = self.import(binding, directive); |
| self.legacy_import_macro(ident.name, imported_binding, span, allow_shadowing); |
| }); |
| } else { |
| for (name, span) in single_imports.iter().cloned() { |
| let ident = Ident::with_empty_ctxt(name); |
| let result = self.resolve_ident_in_module( |
| ModuleOrUniformRoot::Module(module), |
| ident, |
| MacroNS, |
| None, |
| false, |
| span, |
| ); |
| if let Ok(binding) = result { |
| let directive = macro_use_directive(span); |
| self.potentially_unused_imports.push(directive); |
| let imported_binding = self.import(binding, directive); |
| self.legacy_import_macro(name, imported_binding, span, allow_shadowing); |
| } else { |
| span_err!(self.session, span, E0469, "imported macro not found"); |
| } |
| } |
| } |
| import_all.is_some() || !single_imports.is_empty() |
| } |
| |
| // does this attribute list contain "macro_use"? |
| fn contains_macro_use(&mut self, attrs: &[ast::Attribute]) -> bool { |
| for attr in attrs { |
| if attr.check_name("macro_escape") { |
| let msg = "macro_escape is a deprecated synonym for macro_use"; |
| let mut err = self.session.struct_span_warn(attr.span, msg); |
| if let ast::AttrStyle::Inner = attr.style { |
| err.help("consider an outer attribute, #[macro_use] mod ...").emit(); |
| } else { |
| err.emit(); |
| } |
| } else if !attr.check_name("macro_use") { |
| continue; |
| } |
| |
| if !attr.is_word() { |
| self.session.span_err(attr.span, "arguments to macro_use are not allowed here"); |
| } |
| return true; |
| } |
| |
| false |
| } |
| } |
| |
| pub struct BuildReducedGraphVisitor<'a, 'b: 'a, 'c: 'b> { |
| pub resolver: &'a mut Resolver<'b, 'c>, |
| pub current_legacy_scope: LegacyScope<'b>, |
| pub expansion: Mark, |
| } |
| |
| impl<'a, 'b, 'cl> BuildReducedGraphVisitor<'a, 'b, 'cl> { |
| fn visit_invoc(&mut self, id: ast::NodeId) -> &'b InvocationData<'b> { |
| let mark = id.placeholder_to_mark(); |
| self.resolver.current_module.unresolved_invocations.borrow_mut().insert(mark); |
| let invocation = self.resolver.invocations[&mark]; |
| invocation.module.set(self.resolver.current_module); |
| invocation.parent_legacy_scope.set(self.current_legacy_scope); |
| invocation |
| } |
| } |
| |
| macro_rules! method { |
| ($visit:ident: $ty:ty, $invoc:path, $walk:ident) => { |
| fn $visit(&mut self, node: &'a $ty) { |
| if let $invoc(..) = node.node { |
| self.visit_invoc(node.id); |
| } else { |
| visit::$walk(self, node); |
| } |
| } |
| } |
| } |
| |
| impl<'a, 'b, 'cl> Visitor<'a> for BuildReducedGraphVisitor<'a, 'b, 'cl> { |
| method!(visit_impl_item: ast::ImplItem, ast::ImplItemKind::Macro, walk_impl_item); |
| method!(visit_expr: ast::Expr, ast::ExprKind::Mac, walk_expr); |
| method!(visit_pat: ast::Pat, ast::PatKind::Mac, walk_pat); |
| method!(visit_ty: ast::Ty, ast::TyKind::Mac, walk_ty); |
| |
| fn visit_item(&mut self, item: &'a Item) { |
| let macro_use = match item.node { |
| ItemKind::MacroDef(..) => { |
| self.resolver.define_macro(item, self.expansion, &mut self.current_legacy_scope); |
| return |
| } |
| ItemKind::Mac(..) => { |
| self.current_legacy_scope = LegacyScope::Invocation(self.visit_invoc(item.id)); |
| return |
| } |
| ItemKind::Mod(..) => self.resolver.contains_macro_use(&item.attrs), |
| _ => false, |
| }; |
| |
| let orig_current_module = self.resolver.current_module; |
| let orig_current_legacy_scope = self.current_legacy_scope; |
| let parent_scope = ParentScope { |
| module: self.resolver.current_module, |
| expansion: self.expansion, |
| legacy: self.current_legacy_scope, |
| derives: Vec::new(), |
| }; |
| self.resolver.build_reduced_graph_for_item(item, parent_scope); |
| visit::walk_item(self, item); |
| self.resolver.current_module = orig_current_module; |
| if !macro_use { |
| self.current_legacy_scope = orig_current_legacy_scope; |
| } |
| } |
| |
| fn visit_stmt(&mut self, stmt: &'a ast::Stmt) { |
| if let ast::StmtKind::Mac(..) = stmt.node { |
| self.current_legacy_scope = LegacyScope::Invocation(self.visit_invoc(stmt.id)); |
| } else { |
| visit::walk_stmt(self, stmt); |
| } |
| } |
| |
| fn visit_foreign_item(&mut self, foreign_item: &'a ForeignItem) { |
| if let ForeignItemKind::Macro(_) = foreign_item.node { |
| self.visit_invoc(foreign_item.id); |
| return; |
| } |
| |
| self.resolver.build_reduced_graph_for_foreign_item(foreign_item, self.expansion); |
| visit::walk_foreign_item(self, foreign_item); |
| } |
| |
| fn visit_block(&mut self, block: &'a Block) { |
| let orig_current_module = self.resolver.current_module; |
| let orig_current_legacy_scope = self.current_legacy_scope; |
| self.resolver.build_reduced_graph_for_block(block, self.expansion); |
| visit::walk_block(self, block); |
| self.resolver.current_module = orig_current_module; |
| self.current_legacy_scope = orig_current_legacy_scope; |
| } |
| |
| fn visit_trait_item(&mut self, item: &'a TraitItem) { |
| let parent = self.resolver.current_module; |
| |
| if let TraitItemKind::Macro(_) = item.node { |
| self.visit_invoc(item.id); |
| return |
| } |
| |
| // Add the item to the trait info. |
| let item_def_id = self.resolver.definitions.local_def_id(item.id); |
| let (def, ns) = match item.node { |
| TraitItemKind::Const(..) => (Def::AssociatedConst(item_def_id), ValueNS), |
| TraitItemKind::Method(ref sig, _) => { |
| if sig.decl.has_self() { |
| self.resolver.has_self.insert(item_def_id); |
| } |
| (Def::Method(item_def_id), ValueNS) |
| } |
| TraitItemKind::Type(..) => (Def::AssociatedTy(item_def_id), TypeNS), |
| TraitItemKind::Macro(_) => bug!(), // handled above |
| }; |
| |
| let vis = ty::Visibility::Public; |
| self.resolver.define(parent, item.ident, ns, (def, vis, item.span, self.expansion)); |
| |
| self.resolver.current_module = parent.parent.unwrap(); // nearest normal ancestor |
| visit::walk_trait_item(self, item); |
| self.resolver.current_module = parent; |
| } |
| |
| fn visit_token(&mut self, t: Token) { |
| if let Token::Interpolated(nt) = t { |
| if let token::NtExpr(ref expr) = nt.0 { |
| if let ast::ExprKind::Mac(..) = expr.node { |
| self.visit_invoc(expr.id); |
| } |
| } |
| } |
| } |
| |
| fn visit_attribute(&mut self, attr: &'a ast::Attribute) { |
| if !attr.is_sugared_doc && is_builtin_attr(attr) { |
| let parent_scope = ParentScope { |
| module: self.resolver.current_module.nearest_item_scope(), |
| expansion: self.expansion, |
| legacy: self.current_legacy_scope, |
| // Let's hope discerning built-in attributes from derive helpers is not necessary |
| derives: Vec::new(), |
| }; |
| parent_scope.module.builtin_attrs.borrow_mut().push(( |
| attr.path.segments[0].ident, parent_scope |
| )); |
| } |
| visit::walk_attribute(self, attr); |
| } |
| } |
