Merge remote-tracking branch 'upstream/master' into 503-hover-doc-links

1 files changed, 174 insertions, 0 deletions

diff --git a/crates/hir_def/src/lang_item.rs b/crates/hir_def/src/lang_item.rs
new file mode 100644
index 000000000..063eadccb
--- /dev/null
+++ b/crates/hir_def/src/lang_item.rs
@@ -0,0 +1,174 @@
+//! 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, ModuleId,
+    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);
+
+        crate_def_map
+            .modules
+            .iter()
+            .filter_map(|(local_id, _)| db.module_lang_items(ModuleId { krate, local_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: &dyn DefDatabase,
+        module: ModuleId,
+    ) -> Option<Arc<LangItems>> {
+        let _p = profile::span("module_lang_items_query");
+        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: &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_items(&mut self, db: &dyn DefDatabase, module: ModuleId) {
+        // Look for impl targets
+        let def_map = db.crate_def_map(module.krate);
+        let module_data = &def_map[module.local_id];
+        for impl_def in module_data.scope.impls() {
+            self.collect_lang_item(db, impl_def, LangItemTarget::ImplDefId)
+        }
+
+        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: &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()
+}