1 //! Validity checking for weak lang items
3 use crate::def_id::DefId;
4 use crate::{lang_items, LangItem, LanguageItems};
7 use rustc_data_structures::fx::FxHashMap;
8 use rustc_span::symbol::{sym, Symbol};
10 use lazy_static::lazy_static;
12 macro_rules! weak_lang_items {
13 ($($name:ident, $item:ident, $sym:ident;)*) => (
16 pub static ref WEAK_ITEMS_REFS: FxHashMap<Symbol, LangItem> = {
17 let mut map = FxHashMap::default();
18 $(map.insert(sym::$name, lang_items::$item);)*
23 /// The `check_name` argument avoids the need for `librustc_hir` to depend on
24 /// `librustc_session`.
25 pub fn link_name<'a, F>(check_name: F, attrs: &'a [ast::Attribute]) -> Option<Symbol>
27 F: Fn(&'a ast::Attribute, Symbol) -> bool
29 lang_items::extract(check_name, attrs).and_then(|(name, _)| {
30 $(if name == sym::$name {
39 pub fn is_weak_lang_item(&self, item_def_id: DefId) -> bool {
40 let did = Some(item_def_id);
42 $(self.$name() == did)||*
49 panic_impl, PanicImplLangItem, rust_begin_unwind;
50 eh_personality, EhPersonalityLangItem, rust_eh_personality;
51 oom, OomLangItem, rust_oom;