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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 ra_syntax::SmolStr;
use rustc_hash::FxHashMap;
use crate::{
db::DefDatabase, AdtId, AttrDefId, CrateId, EnumId, FunctionId, ImplId, ModuleDefId, ModuleId,
StaticId, StructId, TraitId,
};
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum LangItemTarget {
EnumId(EnumId),
FunctionId(FunctionId),
ImplBlockId(ImplId),
StaticId(StaticId),
StructId(StructId),
TraitId(TraitId),
}
#[derive(Default, Debug, Clone, PartialEq, Eq)]
pub struct LangItems {
items: FxHashMap<SmolStr, LangItemTarget>,
}
impl LangItems {
pub fn target<'a>(&'a self, item: &str) -> Option<&'a LangItemTarget> {
self.items.get(item)
}
/// Salsa query. This will look for lang items in a specific crate.
pub(crate) fn crate_lang_items_query(db: &impl DefDatabase, krate: CrateId) -> Arc<LangItems> {
let mut lang_items = LangItems::default();
let crate_def_map = db.crate_def_map(krate);
crate_def_map
.modules()
.filter_map(|module_id| db.module_lang_items(ModuleId { krate, module_id }))
.for_each(|it| lang_items.items.extend(it.items.iter().map(|(k, v)| (k.clone(), *v))));
Arc::new(lang_items)
}
pub(crate) fn module_lang_items_query(
db: &impl DefDatabase,
module: ModuleId,
) -> Option<Arc<LangItems>> {
let mut lang_items = LangItems::default();
lang_items.collect_lang_items(db, module);
if lang_items.items.is_empty() {
None
} else {
Some(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: &impl DefDatabase,
start_crate: CrateId,
item: SmolStr,
) -> Option<LangItemTarget> {
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()
.dependencies(start_crate)
.find_map(|dep| db.lang_item(dep.crate_id, item.clone()))
}
fn collect_lang_items(&mut self, db: &impl DefDatabase, module: ModuleId) {
// Look for impl targets
let def_map = db.crate_def_map(module.krate);
let module_data = &def_map[module.module_id];
for &impl_block in module_data.impls.iter() {
self.collect_lang_item(db, impl_block, LangItemTarget::ImplBlockId)
}
for def in module_data.scope.declarations() {
match def {
ModuleDefId::TraitId(trait_) => {
self.collect_lang_item(db, trait_, LangItemTarget::TraitId)
}
ModuleDefId::AdtId(AdtId::EnumId(e)) => {
self.collect_lang_item(db, e, LangItemTarget::EnumId)
}
ModuleDefId::AdtId(AdtId::StructId(s)) => {
self.collect_lang_item(db, s, LangItemTarget::StructId)
}
ModuleDefId::FunctionId(f) => {
self.collect_lang_item(db, f, LangItemTarget::FunctionId)
}
ModuleDefId::StaticId(s) => self.collect_lang_item(db, s, LangItemTarget::StaticId),
_ => {}
}
}
}
fn collect_lang_item<T>(
&mut self,
db: &impl DefDatabase,
item: T,
constructor: fn(T) -> LangItemTarget,
) where
T: Into<AttrDefId> + Copy,
{
let attrs = db.attrs(item.into());
if let Some(lang_item_name) = attrs.by_key("lang").string_value() {
self.items.entry(lang_item_name.clone()).or_insert_with(|| constructor(item));
}
}
}
|
