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 pub fn link_name(attrs: &[ast::Attribute]) -> Option<Symbol>
23 lang_items::extract(attrs).and_then(|(name, _)| {
24 $(if name == sym::$name {
33 pub fn is_weak_lang_item(&self, item_def_id: DefId) -> bool {
34 let did = Some(item_def_id);
36 $(self.$name() == did)||*
43 panic_impl, PanicImpl, rust_begin_unwind;
44 eh_personality, EhPersonality, rust_eh_personality;
45 eh_catch_typeinfo, EhCatchTypeinfo, rust_eh_catch_typeinfo;