| // 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. |
| |
| //! A pass that checks to make sure private fields and methods aren't used |
| //! outside their scopes. This pass will also generate a set of exported items |
| //! which are available for use externally when compiled as a library. |
| |
| pub use self::PrivateDep::*; |
| pub use self::ImportUse::*; |
| pub use self::LastPrivate::*; |
| |
| use middle::def_id::DefId; |
| use util::nodemap::{DefIdSet, FnvHashMap}; |
| |
| use std::hash::Hash; |
| use syntax::ast::NodeId; |
| |
| // Accessibility levels, sorted in ascending order |
| #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord)] |
| pub enum AccessLevel { |
| // Exported items + items participating in various kinds of public interfaces, |
| // but not directly nameable. For example, if function `fn f() -> T {...}` is |
| // public, then type `T` is exported. Its values can be obtained by other crates |
| // even if the type itseld is not nameable. |
| // FIXME: Mostly unimplemented. Only `type` aliases export items currently. |
| Reachable, |
| // Public items + items accessible to other crates with help of `pub use` reexports |
| Exported, |
| // Items accessible to other crates directly, without help of reexports |
| Public, |
| } |
| |
| // Accessibility levels for reachable HIR nodes |
| #[derive(Clone)] |
| pub struct AccessLevels<Id = NodeId> { |
| pub map: FnvHashMap<Id, AccessLevel> |
| } |
| |
| impl<Id: Hash + Eq> AccessLevels<Id> { |
| pub fn is_reachable(&self, id: Id) -> bool { |
| self.map.contains_key(&id) |
| } |
| pub fn is_exported(&self, id: Id) -> bool { |
| self.map.get(&id) >= Some(&AccessLevel::Exported) |
| } |
| pub fn is_public(&self, id: Id) -> bool { |
| self.map.get(&id) >= Some(&AccessLevel::Public) |
| } |
| } |
| |
| impl<Id: Hash + Eq> Default for AccessLevels<Id> { |
| fn default() -> Self { |
| AccessLevels { map: Default::default() } |
| } |
| } |
| |
| /// A set containing all exported definitions from external crates. |
| /// The set does not contain any entries from local crates. |
| pub type ExternalExports = DefIdSet; |
| |
| #[derive(Copy, Clone, Debug)] |
| pub enum LastPrivate { |
| LastMod(PrivateDep), |
| // `use` directives (imports) can refer to two separate definitions in the |
| // type and value namespaces. We record here the last private node for each |
| // and whether the import is in fact used for each. |
| // If the Option<PrivateDep> fields are None, it means there is no definition |
| // in that namespace. |
| LastImport{value_priv: Option<PrivateDep>, |
| value_used: ImportUse, |
| type_priv: Option<PrivateDep>, |
| type_used: ImportUse}, |
| } |
| |
| #[derive(Copy, Clone, Debug)] |
| pub enum PrivateDep { |
| AllPublic, |
| DependsOn(DefId), |
| } |
| |
| // How an import is used. |
| #[derive(Copy, Clone, PartialEq, Debug)] |
| pub enum ImportUse { |
| Unused, // The import is not used. |
| Used, // The import is used. |
| } |
| |
| impl LastPrivate { |
| pub fn or(self, other: LastPrivate) -> LastPrivate { |
| match (self, other) { |
| (me, LastMod(AllPublic)) => me, |
| (_, other) => other, |
| } |
| } |
| } |