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|
//! Collects lang items: items marked with `#[lang = "..."]` attribute.
//!
//! This attribute to tell the compiler about semi built-in std library
//! features, such as Fn family of traits.
use std::sync::Arc;
use rustc_hash::FxHashMap;
use syntax::SmolStr;
use crate::{
db::DefDatabase, AdtId, AttrDefId, CrateId, EnumId, FunctionId, ImplId, ModuleDefId, StaticId,
StructId, TraitId,
};
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum LangItemTarget {
EnumId(EnumId),
FunctionId(FunctionId),
ImplDefId(ImplId),
StaticId(StaticId),
StructId(StructId),
TraitId(TraitId),
}
impl LangItemTarget {
pub fn as_enum(self) -> Option<EnumId> {
match self {
LangItemTarget::EnumId(id) => Some(id),
_ => None,
}
}
pub fn as_function(self) -> Option<FunctionId> {
match self {
LangItemTarget::FunctionId(id) => Some(id),
_ => None,
}
}
pub fn as_impl_def(self) -> Option<ImplId> {
match self {
LangItemTarget::ImplDefId(id) => Some(id),
_ => None,
}
}
pub fn as_static(self) -> Option<StaticId> {
match self {
LangItemTarget::StaticId(id) => Some(id),
_ => None,
}
}
pub fn as_struct(self) -> Option<StructId> {
match self {
LangItemTarget::StructId(id) => Some(id),
_ => None,
}
}
pub fn as_trait(self) -> Option<TraitId> {
match self {
LangItemTarget::TraitId(id) => Some(id),
_ => None,
}
}
}
#[derive(Default, Debug, Clone, PartialEq, Eq)]
pub struct LangItems {
items: FxHashMap<SmolStr, LangItemTarget>,
}
impl LangItems {
pub fn target(&self, item: &str) -> Option<LangItemTarget> {
self.items.get(item).copied()
}
/// Salsa query. This will look for lang items in a specific crate.
pub(crate) fn crate_lang_items_query(db: &dyn DefDatabase, krate: CrateId) -> Arc<LangItems> {
let _p = profile::span("crate_lang_items_query");
let mut lang_items = LangItems::default();
let crate_def_map = db.crate_def_map(krate);
for (_, module_data) in crate_def_map.modules() {
for impl_def in module_data.scope.impls() {
lang_items.collect_lang_item(db, impl_def, LangItemTarget::ImplDefId)
}
for def in module_data.scope.declarations() {
match def {
ModuleDefId::TraitId(trait_) => {
lang_items.collect_lang_item(db, trait_, LangItemTarget::TraitId)
}
ModuleDefId::AdtId(AdtId::EnumId(e)) => {
lang_items.collect_lang_item(db, e, LangItemTarget::EnumId)
}
ModuleDefId::AdtId(AdtId::StructId(s)) => {
lang_items.collect_lang_item(db, s, LangItemTarget::StructId)
}
ModuleDefId::FunctionId(f) => {
lang_items.collect_lang_item(db, f, LangItemTarget::FunctionId)
}
ModuleDefId::StaticId(s) => {
lang_items.collect_lang_item(db, s, LangItemTarget::StaticId)
}
_ => {}
}
}
}
Arc::new(lang_items)
}
/// Salsa query. Look for a lang item, starting from the specified crate and recursively
/// traversing its dependencies.
pub(crate) fn lang_item_query(
db: &dyn DefDatabase,
start_crate: CrateId,
item: SmolStr,
) -> Option<LangItemTarget> {
let _p = profile::span("lang_item_query");
let lang_items = db.crate_lang_items(start_crate);
let start_crate_target = lang_items.items.get(&item);
if let Some(target) = start_crate_target {
return Some(*target);
}
db.crate_graph()[start_crate]
.dependencies
.iter()
.find_map(|dep| db.lang_item(dep.crate_id, item.clone()))
}
fn collect_lang_item<T>(
&mut self,
db: &dyn DefDatabase,
item: T,
constructor: fn(T) -> LangItemTarget,
) where
T: Into<AttrDefId> + Copy,
{
if let Some(lang_item_name) = lang_attr(db, item) {
self.items.entry(lang_item_name).or_insert_with(|| constructor(item));
}
}
}
pub fn lang_attr(db: &dyn DefDatabase, item: impl Into<AttrDefId> + Copy) -> Option<SmolStr> {
let attrs = db.attrs(item.into());
attrs.by_key("lang").string_value().cloned()
}
|
