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//! 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.
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_macros::HashStable;
use rustc_query_system::ich::StableHashingContext;
use rustc_span::def_id::LocalDefId;
use std::hash::Hash;
/// Represents the levels of accessibility an item can have.
///
/// The variants are sorted in ascending order of accessibility.
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, HashStable)]
pub enum AccessLevel {
/// Superset of `AccessLevel::Reachable` used to mark impl Trait items.
ReachableFromImplTrait,
/// 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 reachable. Its values can be obtained by other crates
/// even if the type itself is not nameable.
Reachable,
/// Public items + items accessible to other crates with the help of `pub use` re-exports.
Exported,
/// Items accessible to other crates directly, without the help of re-exports.
Public,
}
/// Holds a map of accessibility levels for reachable HIR nodes.
#[derive(Debug, Clone)]
pub struct AccessLevels<Id = LocalDefId> {
pub map: FxHashMap<Id, AccessLevel>,
}
impl<Id: Hash + Eq> AccessLevels<Id> {
/// See `AccessLevel::Reachable`.
pub fn is_reachable(&self, id: Id) -> bool {
self.map.get(&id) >= Some(&AccessLevel::Reachable)
}
/// See `AccessLevel::Exported`.
pub fn is_exported(&self, id: Id) -> bool {
self.map.get(&id) >= Some(&AccessLevel::Exported)
}
/// See `AccessLevel::Public`.
pub fn is_public(&self, id: Id) -> bool {
self.map.get(&id) >= Some(&AccessLevel::Public)
}
}
impl<Id> Default for AccessLevels<Id> {
fn default() -> Self {
AccessLevels { map: Default::default() }
}
}
impl<'a> HashStable<StableHashingContext<'a>> for AccessLevels {
fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
let AccessLevels { ref map } = *self;
map.hash_stable(hcx, hasher);
}
}
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