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//! Validity checking for weak lang items
use crate::def_id::DefId;
use crate::{lang_items, LangItem, LanguageItems};
use rustc_ast as ast;
use rustc_data_structures::stable_map::StableMap;
use rustc_span::symbol::{sym, Symbol};
use std::lazy::SyncLazy;
macro_rules! weak_lang_items {
($($name:ident, $item:ident, $sym:ident;)*) => (
pub static WEAK_ITEMS_REFS: SyncLazy<StableMap<Symbol, LangItem>> = SyncLazy::new(|| {
let mut map = StableMap::default();
$(map.insert(sym::$name, LangItem::$item);)*
map
});
pub fn link_name(attrs: &[ast::Attribute]) -> Option<Symbol>
{
lang_items::extract(attrs).and_then(|(name, _)| {
$(if name == sym::$name {
Some(sym::$sym)
} else)* {
None
}
})
}
impl LanguageItems {
pub fn is_weak_lang_item(&self, item_def_id: DefId) -> bool {
let did = Some(item_def_id);
$(self.$name() == did)||*
}
}
) }
weak_lang_items! {
panic_impl, PanicImpl, rust_begin_unwind;
eh_personality, EhPersonality, rust_eh_personality;
eh_catch_typeinfo, EhCatchTypeinfo, rust_eh_catch_typeinfo;
oom, Oom, rust_oom;
}
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