49 lines
1.2 KiB
Rust
49 lines
1.2 KiB
Rust
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//! Validity checking for weak lang items
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use crate::{lang_items, LangItem, LanguageItems};
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use rustc_data_structures::fx::FxHashMap;
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use rustc_hir::def_id::DefId;
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use rustc_span::symbol::{sym, Symbol};
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use syntax::ast;
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use lazy_static::lazy_static;
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macro_rules! weak_lang_items {
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($($name:ident, $item:ident, $sym:ident;)*) => (
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lazy_static! {
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pub static ref WEAK_ITEMS_REFS: FxHashMap<Symbol, LangItem> = {
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let mut map = FxHashMap::default();
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$(map.insert(sym::$name, lang_items::$item);)*
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map
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};
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}
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pub fn link_name(attrs: &[ast::Attribute]) -> Option<Symbol> {
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lang_items::extract(attrs).and_then(|(name, _)| {
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$(if name == sym::$name {
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Some(sym::$sym)
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} else)* {
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None
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}
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})
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}
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impl LanguageItems {
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pub fn is_weak_lang_item(&self, item_def_id: DefId) -> bool {
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let did = Some(item_def_id);
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$(self.$name() == did)||*
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}
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}
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) }
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weak_lang_items! {
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panic_impl, PanicImplLangItem, rust_begin_unwind;
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eh_personality, EhPersonalityLangItem, rust_eh_personality;
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eh_unwind_resume, EhUnwindResumeLangItem, rust_eh_unwind_resume;
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oom, OomLangItem, rust_oom;
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}
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