1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
//! Validity checking for weak lang items
use crate::def_id::DefId;
use crate::{lang_items, LangItem, LanguageItems};
use rustc_ast::ast;
use rustc_data_structures::fx::FxHashMap;
use rustc_span::symbol::{sym, Symbol};
use lazy_static::lazy_static;
macro_rules! weak_lang_items {
($($name:ident, $item:ident, $sym:ident;)*) => (
lazy_static! {
pub static ref WEAK_ITEMS_REFS: FxHashMap<Symbol, LangItem> = {
let mut map = FxHashMap::default();
$(map.insert(sym::$name, lang_items::$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, PanicImplLangItem, rust_begin_unwind;
eh_personality, EhPersonalityLangItem, rust_eh_personality;
oom, OomLangItem, rust_oom;
}
|
