rustc_hir/
weak_lang_items.rs

1//! Validity checking for weak lang items
2
3use rustc_span::{Symbol, sym};
4
5use crate::LangItem;
6
7macro_rules! weak_lang_items {
8    ($($item:ident, $sym:ident;)*) => {
9        pub static WEAK_LANG_ITEMS: &[LangItem] = &[$(LangItem::$item,)*];
10
11        impl LangItem {
12            pub fn is_weak(self) -> bool {
13                matches!(self, $(LangItem::$item)|*)
14            }
15
16            pub fn link_name(self) -> Option<Symbol> {
17                match self {
18                    $( LangItem::$item => Some(sym::$sym),)*
19                    _ => None,
20                }
21            }
22        }
23    }
24}
25
26macro_rules! weak_only_lang_items {
27    ($($item:ident,)*) => {
28        impl LangItem {
29            pub fn is_weak_only(self) -> bool {
30                matches!(self, $(LangItem::$item)|*)
31            }
32        }
33    }
34}
35
36pub static WEAK_LANG_ITEMS: &[LangItem] =
    &[LangItem::PanicImpl, LangItem::EhPersonality];
impl LangItem {
    pub fn is_weak(self) -> bool {

        #[allow(non_exhaustive_omitted_patterns)]
        match self {
            LangItem::PanicImpl | LangItem::EhPersonality => true,
            _ => false,
        }
    }
    pub fn link_name(self) -> Option<Symbol> {
        match self {
            LangItem::PanicImpl => Some(sym::rust_begin_unwind),
            LangItem::EhPersonality => Some(sym::rust_eh_personality),
            _ => None,
        }
    }
}weak_lang_items! {
37    PanicImpl,          rust_begin_unwind;
38    EhPersonality,      rust_eh_personality;
39}
40
41impl LangItem {
    pub fn is_weak_only(self) -> bool {

        #[allow(non_exhaustive_omitted_patterns)]
        match self {
            LangItem::MemCpy | LangItem::MemMove | LangItem::MemSet |
                LangItem::MemCmp | LangItem::Bcmp | LangItem::StrLen => true,
            _ => false,
        }
    }
}weak_only_lang_items! {
42    MemCpy,
43    MemMove,
44    MemSet,
45    MemCmp,
46    Bcmp,
47    StrLen,
48}
rustc_hir/weak_lang_items.rs

rustc_hir/
weak_lang_items.rs
