compiler/rustc_hir/src/weak_lang_items.rs

   1 //! Validity checking for weak lang items
   2
   3 use crate::LangItem;
   4
   5 use rustc_span::symbol::{sym, Symbol};
   6
   7 macro_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
  26 weak_lang_items! {
  27     PanicImpl,          rust_begin_unwind;
  28     EhPersonality,      rust_eh_personality;
  29     EhCatchTypeinfo,    rust_eh_catch_typeinfo;
  30 }