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::stable_map::StableMap;
8 use rustc_span::symbol::{sym, Symbol};
10 use std::lazy::SyncLazy;
12 macro_rules! weak_lang_items {
13 ($($name:ident, $item:ident, $sym:ident;)*) => (
15 pub static WEAK_ITEMS_REFS: SyncLazy<StableMap<Symbol, LangItem>> = SyncLazy::new(|| {
16 let mut map = StableMap::default();
17 $(map.insert(sym::$name, LangItem::$item);)*
21 /// The `check_name` argument avoids the need for `librustc_hir` to depend on
22 /// `librustc_session`.
23 pub fn link_name<'a, F>(check_name: F, attrs: &'a [ast::Attribute]) -> Option<Symbol>
25 F: Fn(&'a ast::Attribute, Symbol) -> bool
27 lang_items::extract(check_name, attrs).and_then(|(name, _)| {
28 $(if name == sym::$name {
37 pub fn is_weak_lang_item(&self, item_def_id: DefId) -> bool {
38 let did = Some(item_def_id);
40 $(self.$name() == did)||*
47 panic_impl, PanicImpl, rust_begin_unwind;
48 eh_personality, EhPersonality, rust_eh_personality;
49 eh_catch_typeinfo, EhCatchTypeinfo, rust_eh_catch_typeinfo;