446 lines
27 KiB
Rust
446 lines
27 KiB
Rust
//! Collects lang items: items marked with `#[lang = "..."]` attribute.
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//!
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//! This attribute to tell the compiler about semi built-in std library
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//! features, such as Fn family of traits.
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use hir_expand::name::Name;
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use rustc_hash::FxHashMap;
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use syntax::SmolStr;
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use triomphe::Arc;
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use crate::{
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db::DefDatabase, path::Path, AdtId, AssocItemId, AttrDefId, CrateId, EnumId, EnumVariantId,
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FunctionId, ImplId, ModuleDefId, StaticId, StructId, TraitId, TypeAliasId, UnionId,
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};
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub enum LangItemTarget {
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EnumId(EnumId),
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Function(FunctionId),
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ImplDef(ImplId),
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Static(StaticId),
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Struct(StructId),
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Union(UnionId),
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TypeAlias(TypeAliasId),
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Trait(TraitId),
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EnumVariant(EnumVariantId),
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}
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impl LangItemTarget {
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pub fn as_enum(self) -> Option<EnumId> {
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match self {
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LangItemTarget::EnumId(id) => Some(id),
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_ => None,
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}
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}
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pub fn as_function(self) -> Option<FunctionId> {
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match self {
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LangItemTarget::Function(id) => Some(id),
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_ => None,
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}
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}
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pub fn as_impl_def(self) -> Option<ImplId> {
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match self {
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LangItemTarget::ImplDef(id) => Some(id),
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_ => None,
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}
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}
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pub fn as_static(self) -> Option<StaticId> {
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match self {
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LangItemTarget::Static(id) => Some(id),
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_ => None,
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}
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}
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pub fn as_struct(self) -> Option<StructId> {
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match self {
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LangItemTarget::Struct(id) => Some(id),
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_ => None,
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}
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}
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pub fn as_trait(self) -> Option<TraitId> {
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match self {
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LangItemTarget::Trait(id) => Some(id),
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_ => None,
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}
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}
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pub fn as_enum_variant(self) -> Option<EnumVariantId> {
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match self {
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LangItemTarget::EnumVariant(id) => Some(id),
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_ => None,
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}
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}
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}
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#[derive(Default, Debug, Clone, PartialEq, Eq)]
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pub struct LangItems {
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items: FxHashMap<LangItem, LangItemTarget>,
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}
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impl LangItems {
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pub fn target(&self, item: LangItem) -> Option<LangItemTarget> {
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self.items.get(&item).copied()
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}
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/// Salsa query. This will look for lang items in a specific crate.
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pub(crate) fn crate_lang_items_query(db: &dyn DefDatabase, krate: CrateId) -> Arc<LangItems> {
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let _p = profile::span("crate_lang_items_query");
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let mut lang_items = LangItems::default();
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let crate_def_map = db.crate_def_map(krate);
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for (_, module_data) in crate_def_map.modules() {
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for impl_def in module_data.scope.impls() {
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lang_items.collect_lang_item(db, impl_def, LangItemTarget::ImplDef);
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for assoc in db.impl_data(impl_def).items.iter().copied() {
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match assoc {
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AssocItemId::FunctionId(f) => {
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lang_items.collect_lang_item(db, f, LangItemTarget::Function)
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}
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AssocItemId::TypeAliasId(t) => {
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lang_items.collect_lang_item(db, t, LangItemTarget::TypeAlias)
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}
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AssocItemId::ConstId(_) => (),
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}
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}
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}
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for def in module_data.scope.declarations() {
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match def {
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ModuleDefId::TraitId(trait_) => {
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lang_items.collect_lang_item(db, trait_, LangItemTarget::Trait);
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db.trait_data(trait_).items.iter().for_each(|&(_, assoc_id)| {
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if let AssocItemId::FunctionId(f) = assoc_id {
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lang_items.collect_lang_item(db, f, LangItemTarget::Function);
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}
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});
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}
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ModuleDefId::AdtId(AdtId::EnumId(e)) => {
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lang_items.collect_lang_item(db, e, LangItemTarget::EnumId);
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db.enum_data(e).variants.iter().for_each(|(local_id, _)| {
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lang_items.collect_lang_item(
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db,
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EnumVariantId { parent: e, local_id },
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LangItemTarget::EnumVariant,
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);
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});
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}
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ModuleDefId::AdtId(AdtId::StructId(s)) => {
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lang_items.collect_lang_item(db, s, LangItemTarget::Struct);
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}
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ModuleDefId::AdtId(AdtId::UnionId(u)) => {
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lang_items.collect_lang_item(db, u, LangItemTarget::Union);
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}
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ModuleDefId::FunctionId(f) => {
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lang_items.collect_lang_item(db, f, LangItemTarget::Function);
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}
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ModuleDefId::StaticId(s) => {
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lang_items.collect_lang_item(db, s, LangItemTarget::Static);
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}
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ModuleDefId::TypeAliasId(t) => {
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lang_items.collect_lang_item(db, t, LangItemTarget::TypeAlias);
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}
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_ => {}
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}
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}
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}
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Arc::new(lang_items)
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}
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/// Salsa query. Look for a lang item, starting from the specified crate and recursively
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/// traversing its dependencies.
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pub(crate) fn lang_item_query(
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db: &dyn DefDatabase,
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start_crate: CrateId,
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item: LangItem,
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) -> Option<LangItemTarget> {
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let _p = profile::span("lang_item_query");
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let lang_items = db.crate_lang_items(start_crate);
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let start_crate_target = lang_items.items.get(&item);
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if let Some(&target) = start_crate_target {
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return Some(target);
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}
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db.crate_graph()[start_crate]
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.dependencies
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.iter()
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.find_map(|dep| db.lang_item(dep.crate_id, item))
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}
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fn collect_lang_item<T>(
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&mut self,
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db: &dyn DefDatabase,
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item: T,
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constructor: fn(T) -> LangItemTarget,
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) where
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T: Into<AttrDefId> + Copy,
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{
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let _p = profile::span("collect_lang_item");
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if let Some(lang_item) = db.lang_attr(item.into()) {
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self.items.entry(lang_item).or_insert_with(|| constructor(item));
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}
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}
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}
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pub(crate) fn lang_attr_query(db: &dyn DefDatabase, item: AttrDefId) -> Option<LangItem> {
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let attrs = db.attrs(item);
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attrs.by_key("lang").string_value().and_then(|it| LangItem::from_str(&it))
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}
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pub enum GenericRequirement {
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None,
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Minimum(usize),
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Exact(usize),
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}
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macro_rules! language_item_table {
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(
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$( $(#[$attr:meta])* $variant:ident, $module:ident :: $name:ident, $method:ident, $target:expr, $generics:expr; )*
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) => {
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/// A representation of all the valid language items in Rust.
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#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
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pub enum LangItem {
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$(
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#[doc = concat!("The `", stringify!($name), "` lang item.")]
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$(#[$attr])*
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$variant,
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)*
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}
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impl LangItem {
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pub fn name(self) -> SmolStr {
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match self {
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$( LangItem::$variant => SmolStr::new(stringify!($name)), )*
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}
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}
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/// Opposite of [`LangItem::name`]
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pub fn from_str(name: &str) -> Option<Self> {
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match name {
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$( stringify!($name) => Some(LangItem::$variant), )*
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_ => None,
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}
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}
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}
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}
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}
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impl LangItem {
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/// Opposite of [`LangItem::name`]
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pub fn from_name(name: &hir_expand::name::Name) -> Option<Self> {
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Self::from_str(name.as_str()?)
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}
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pub fn path(&self, db: &dyn DefDatabase, start_crate: CrateId) -> Option<Path> {
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let t = db.lang_item(start_crate, *self)?;
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Some(Path::LangItem(t, None))
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}
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pub fn ty_rel_path(
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&self,
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db: &dyn DefDatabase,
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start_crate: CrateId,
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seg: Name,
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) -> Option<Path> {
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let t = db.lang_item(start_crate, *self)?;
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Some(Path::LangItem(t, Some(seg)))
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}
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}
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language_item_table! {
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// Variant name, Name, Getter method name, Target Generic requirements;
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Sized, sym::sized, sized_trait, Target::Trait, GenericRequirement::Exact(0);
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Unsize, sym::unsize, unsize_trait, Target::Trait, GenericRequirement::Minimum(1);
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/// Trait injected by `#[derive(PartialEq)]`, (i.e. "Partial EQ").
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StructuralPeq, sym::structural_peq, structural_peq_trait, Target::Trait, GenericRequirement::None;
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/// Trait injected by `#[derive(Eq)]`, (i.e. "Total EQ"; no, I will not apologize).
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StructuralTeq, sym::structural_teq, structural_teq_trait, Target::Trait, GenericRequirement::None;
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Copy, sym::copy, copy_trait, Target::Trait, GenericRequirement::Exact(0);
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Clone, sym::clone, clone_trait, Target::Trait, GenericRequirement::None;
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Sync, sym::sync, sync_trait, Target::Trait, GenericRequirement::Exact(0);
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DiscriminantKind, sym::discriminant_kind, discriminant_kind_trait, Target::Trait, GenericRequirement::None;
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/// The associated item of the [`DiscriminantKind`] trait.
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Discriminant, sym::discriminant_type, discriminant_type, Target::AssocTy, GenericRequirement::None;
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PointeeTrait, sym::pointee_trait, pointee_trait, Target::Trait, GenericRequirement::None;
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Metadata, sym::metadata_type, metadata_type, Target::AssocTy, GenericRequirement::None;
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DynMetadata, sym::dyn_metadata, dyn_metadata, Target::Struct, GenericRequirement::None;
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Freeze, sym::freeze, freeze_trait, Target::Trait, GenericRequirement::Exact(0);
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FnPtrTrait, sym::fn_ptr_trait, fn_ptr_trait, Target::Trait, GenericRequirement::Exact(0);
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FnPtrAddr, sym::fn_ptr_addr, fn_ptr_addr, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None;
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Drop, sym::drop, drop_trait, Target::Trait, GenericRequirement::None;
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Destruct, sym::destruct, destruct_trait, Target::Trait, GenericRequirement::None;
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CoerceUnsized, sym::coerce_unsized, coerce_unsized_trait, Target::Trait, GenericRequirement::Minimum(1);
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DispatchFromDyn, sym::dispatch_from_dyn, dispatch_from_dyn_trait, Target::Trait, GenericRequirement::Minimum(1);
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// language items relating to transmutability
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TransmuteOpts, sym::transmute_opts, transmute_opts, Target::Struct, GenericRequirement::Exact(0);
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TransmuteTrait, sym::transmute_trait, transmute_trait, Target::Trait, GenericRequirement::Exact(3);
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Add, sym::add, add_trait, Target::Trait, GenericRequirement::Exact(1);
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Sub, sym::sub, sub_trait, Target::Trait, GenericRequirement::Exact(1);
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Mul, sym::mul, mul_trait, Target::Trait, GenericRequirement::Exact(1);
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Div, sym::div, div_trait, Target::Trait, GenericRequirement::Exact(1);
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Rem, sym::rem, rem_trait, Target::Trait, GenericRequirement::Exact(1);
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Neg, sym::neg, neg_trait, Target::Trait, GenericRequirement::Exact(0);
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Not, sym::not, not_trait, Target::Trait, GenericRequirement::Exact(0);
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BitXor, sym::bitxor, bitxor_trait, Target::Trait, GenericRequirement::Exact(1);
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BitAnd, sym::bitand, bitand_trait, Target::Trait, GenericRequirement::Exact(1);
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BitOr, sym::bitor, bitor_trait, Target::Trait, GenericRequirement::Exact(1);
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Shl, sym::shl, shl_trait, Target::Trait, GenericRequirement::Exact(1);
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Shr, sym::shr, shr_trait, Target::Trait, GenericRequirement::Exact(1);
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AddAssign, sym::add_assign, add_assign_trait, Target::Trait, GenericRequirement::Exact(1);
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SubAssign, sym::sub_assign, sub_assign_trait, Target::Trait, GenericRequirement::Exact(1);
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MulAssign, sym::mul_assign, mul_assign_trait, Target::Trait, GenericRequirement::Exact(1);
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DivAssign, sym::div_assign, div_assign_trait, Target::Trait, GenericRequirement::Exact(1);
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RemAssign, sym::rem_assign, rem_assign_trait, Target::Trait, GenericRequirement::Exact(1);
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BitXorAssign, sym::bitxor_assign, bitxor_assign_trait, Target::Trait, GenericRequirement::Exact(1);
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BitAndAssign, sym::bitand_assign, bitand_assign_trait, Target::Trait, GenericRequirement::Exact(1);
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BitOrAssign, sym::bitor_assign, bitor_assign_trait, Target::Trait, GenericRequirement::Exact(1);
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ShlAssign, sym::shl_assign, shl_assign_trait, Target::Trait, GenericRequirement::Exact(1);
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ShrAssign, sym::shr_assign, shr_assign_trait, Target::Trait, GenericRequirement::Exact(1);
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Index, sym::index, index_trait, Target::Trait, GenericRequirement::Exact(1);
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IndexMut, sym::index_mut, index_mut_trait, Target::Trait, GenericRequirement::Exact(1);
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UnsafeCell, sym::unsafe_cell, unsafe_cell_type, Target::Struct, GenericRequirement::None;
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VaList, sym::va_list, va_list, Target::Struct, GenericRequirement::None;
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Deref, sym::deref, deref_trait, Target::Trait, GenericRequirement::Exact(0);
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DerefMut, sym::deref_mut, deref_mut_trait, Target::Trait, GenericRequirement::Exact(0);
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DerefTarget, sym::deref_target, deref_target, Target::AssocTy, GenericRequirement::None;
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Receiver, sym::receiver, receiver_trait, Target::Trait, GenericRequirement::None;
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Fn, kw::fn, fn_trait, Target::Trait, GenericRequirement::Exact(1);
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FnMut, sym::fn_mut, fn_mut_trait, Target::Trait, GenericRequirement::Exact(1);
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FnOnce, sym::fn_once, fn_once_trait, Target::Trait, GenericRequirement::Exact(1);
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FnOnceOutput, sym::fn_once_output, fn_once_output, Target::AssocTy, GenericRequirement::None;
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Future, sym::future_trait, future_trait, Target::Trait, GenericRequirement::Exact(0);
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GeneratorState, sym::generator_state, gen_state, Target::Enum, GenericRequirement::None;
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Generator, sym::generator, gen_trait, Target::Trait, GenericRequirement::Minimum(1);
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Unpin, sym::unpin, unpin_trait, Target::Trait, GenericRequirement::None;
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Pin, sym::pin, pin_type, Target::Struct, GenericRequirement::None;
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PartialEq, sym::eq, eq_trait, Target::Trait, GenericRequirement::Exact(1);
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PartialOrd, sym::partial_ord, partial_ord_trait, Target::Trait, GenericRequirement::Exact(1);
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CVoid, sym::c_void, c_void, Target::Enum, GenericRequirement::None;
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// A number of panic-related lang items. The `panic` item corresponds to divide-by-zero and
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// various panic cases with `match`. The `panic_bounds_check` item is for indexing arrays.
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//
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// The `begin_unwind` lang item has a predefined symbol name and is sort of a "weak lang item"
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// in the sense that a crate is not required to have it defined to use it, but a final product
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// is required to define it somewhere. Additionally, there are restrictions on crates that use
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// a weak lang item, but do not have it defined.
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Panic, sym::panic, panic_fn, Target::Fn, GenericRequirement::Exact(0);
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PanicNounwind, sym::panic_nounwind, panic_nounwind, Target::Fn, GenericRequirement::Exact(0);
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PanicFmt, sym::panic_fmt, panic_fmt, Target::Fn, GenericRequirement::None;
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PanicDisplay, sym::panic_display, panic_display, Target::Fn, GenericRequirement::None;
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ConstPanicFmt, sym::const_panic_fmt, const_panic_fmt, Target::Fn, GenericRequirement::None;
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PanicBoundsCheck, sym::panic_bounds_check, panic_bounds_check_fn, Target::Fn, GenericRequirement::Exact(0);
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PanicMisalignedPointerDereference, sym::panic_misaligned_pointer_dereference, panic_misaligned_pointer_dereference_fn, Target::Fn, GenericRequirement::Exact(0);
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PanicInfo, sym::panic_info, panic_info, Target::Struct, GenericRequirement::None;
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PanicLocation, sym::panic_location, panic_location, Target::Struct, GenericRequirement::None;
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PanicImpl, sym::panic_impl, panic_impl, Target::Fn, GenericRequirement::None;
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PanicCannotUnwind, sym::panic_cannot_unwind, panic_cannot_unwind, Target::Fn, GenericRequirement::Exact(0);
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/// libstd panic entry point. Necessary for const eval to be able to catch it
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BeginPanic, sym::begin_panic, begin_panic_fn, Target::Fn, GenericRequirement::None;
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// Lang items needed for `format_args!()`.
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FormatAlignment, sym::format_alignment, format_alignment, Target::Enum, GenericRequirement::None;
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FormatArgument, sym::format_argument, format_argument, Target::Struct, GenericRequirement::None;
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FormatArguments, sym::format_arguments, format_arguments, Target::Struct, GenericRequirement::None;
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FormatCount, sym::format_count, format_count, Target::Enum, GenericRequirement::None;
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FormatPlaceholder, sym::format_placeholder, format_placeholder, Target::Struct, GenericRequirement::None;
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FormatUnsafeArg, sym::format_unsafe_arg, format_unsafe_arg, Target::Struct, GenericRequirement::None;
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ExchangeMalloc, sym::exchange_malloc, exchange_malloc_fn, Target::Fn, GenericRequirement::None;
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BoxFree, sym::box_free, box_free_fn, Target::Fn, GenericRequirement::Minimum(1);
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DropInPlace, sym::drop_in_place, drop_in_place_fn, Target::Fn, GenericRequirement::Minimum(1);
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AllocLayout, sym::alloc_layout, alloc_layout, Target::Struct, GenericRequirement::None;
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Start, sym::start, start_fn, Target::Fn, GenericRequirement::Exact(1);
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EhPersonality, sym::eh_personality, eh_personality, Target::Fn, GenericRequirement::None;
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EhCatchTypeinfo, sym::eh_catch_typeinfo, eh_catch_typeinfo, Target::Static, GenericRequirement::None;
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OwnedBox, sym::owned_box, owned_box, Target::Struct, GenericRequirement::Minimum(1);
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PhantomData, sym::phantom_data, phantom_data, Target::Struct, GenericRequirement::Exact(1);
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ManuallyDrop, sym::manually_drop, manually_drop, Target::Struct, GenericRequirement::None;
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MaybeUninit, sym::maybe_uninit, maybe_uninit, Target::Union, GenericRequirement::None;
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/// Align offset for stride != 1; must not panic.
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AlignOffset, sym::align_offset, align_offset_fn, Target::Fn, GenericRequirement::None;
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Termination, sym::termination, termination, Target::Trait, GenericRequirement::None;
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Try, sym::Try, try_trait, Target::Trait, GenericRequirement::None;
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Tuple, sym::tuple_trait, tuple_trait, Target::Trait, GenericRequirement::Exact(0);
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SliceLen, sym::slice_len_fn, slice_len_fn, Target::Method(MethodKind::Inherent), GenericRequirement::None;
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// Language items from AST lowering
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TryTraitFromResidual, sym::from_residual, from_residual_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None;
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TryTraitFromOutput, sym::from_output, from_output_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None;
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TryTraitBranch, sym::branch, branch_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None;
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TryTraitFromYeet, sym::from_yeet, from_yeet_fn, Target::Fn, GenericRequirement::None;
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PointerLike, sym::pointer_like, pointer_like, Target::Trait, GenericRequirement::Exact(0);
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ConstParamTy, sym::const_param_ty, const_param_ty_trait, Target::Trait, GenericRequirement::Exact(0);
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Poll, sym::Poll, poll, Target::Enum, GenericRequirement::None;
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PollReady, sym::Ready, poll_ready_variant, Target::Variant, GenericRequirement::None;
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PollPending, sym::Pending, poll_pending_variant, Target::Variant, GenericRequirement::None;
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// FIXME(swatinem): the following lang items are used for async lowering and
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// should become obsolete eventually.
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ResumeTy, sym::ResumeTy, resume_ty, Target::Struct, GenericRequirement::None;
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GetContext, sym::get_context, get_context_fn, Target::Fn, GenericRequirement::None;
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Context, sym::Context, context, Target::Struct, GenericRequirement::None;
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FuturePoll, sym::poll, future_poll_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None;
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Option, sym::Option, option_type, Target::Enum, GenericRequirement::None;
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OptionSome, sym::Some, option_some_variant, Target::Variant, GenericRequirement::None;
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OptionNone, sym::None, option_none_variant, Target::Variant, GenericRequirement::None;
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ResultOk, sym::Ok, result_ok_variant, Target::Variant, GenericRequirement::None;
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ResultErr, sym::Err, result_err_variant, Target::Variant, GenericRequirement::None;
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ControlFlowContinue, sym::Continue, cf_continue_variant, Target::Variant, GenericRequirement::None;
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ControlFlowBreak, sym::Break, cf_break_variant, Target::Variant, GenericRequirement::None;
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IntoFutureIntoFuture, sym::into_future, into_future_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None;
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IntoIterIntoIter, sym::into_iter, into_iter_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None;
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IteratorNext, sym::next, next_fn, Target::Method(MethodKind::Trait { body: false}), GenericRequirement::None;
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PinNewUnchecked, sym::new_unchecked, new_unchecked_fn, Target::Method(MethodKind::Inherent), GenericRequirement::None;
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RangeFrom, sym::RangeFrom, range_from_struct, Target::Struct, GenericRequirement::None;
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RangeFull, sym::RangeFull, range_full_struct, Target::Struct, GenericRequirement::None;
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RangeInclusiveStruct, sym::RangeInclusive, range_inclusive_struct, Target::Struct, GenericRequirement::None;
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RangeInclusiveNew, sym::range_inclusive_new, range_inclusive_new_method, Target::Method(MethodKind::Inherent), GenericRequirement::None;
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Range, sym::Range, range_struct, Target::Struct, GenericRequirement::None;
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RangeToInclusive, sym::RangeToInclusive, range_to_inclusive_struct, Target::Struct, GenericRequirement::None;
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RangeTo, sym::RangeTo, range_to_struct, Target::Struct, GenericRequirement::None;
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String, sym::String, string, Target::Struct, GenericRequirement::None;
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CStr, sym::CStr, c_str, Target::Struct, GenericRequirement::None;
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}
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