1 files changed, 0 insertions, 167 deletions
diff --git a/src/librustc/middle/weak_lang_items.rs b/src/librustc/middle/weak_lang_items.rs
deleted file mode 100644
index 5571f8f2313..00000000000
--- a/src/librustc/middle/weak_lang_items.rs
+++ /dev/null
@@ -1,167 +0,0 @@
-//! Validity checking for weak lang items
-
-use crate::middle::lang_items;
-use crate::session::config;
-
-use crate::hir::map::Map;
-use crate::ty::TyCtxt;
-use rustc_data_structures::fx::FxHashSet;
-use rustc_errors::struct_span_err;
-use rustc_hir as hir;
-use rustc_hir::def_id::DefId;
-use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
-use rustc_span::symbol::{sym, Symbol};
-use rustc_span::Span;
-use rustc_target::spec::PanicStrategy;
-use syntax::ast;
-
-macro_rules! weak_lang_items {
-    ($($name:ident, $item:ident, $sym:ident;)*) => (
-
-struct Context<'a, 'tcx> {
-    tcx: TyCtxt<'tcx>,
-    items: &'a mut lang_items::LanguageItems,
-}
-
-/// Checks the crate for usage of weak lang items, returning a vector of all the
-/// language items required by this crate, but not defined yet.
-pub fn check_crate<'tcx>(tcx: TyCtxt<'tcx>,
-                             items: &mut lang_items::LanguageItems) {
-    // These are never called by user code, they're generated by the compiler.
-    // They will never implicitly be added to the `missing` array unless we do
-    // so here.
-    if items.eh_personality().is_none() {
-        items.missing.push(lang_items::EhPersonalityLangItem);
-    }
-    if tcx.sess.target.target.options.custom_unwind_resume &
-       items.eh_unwind_resume().is_none() {
-        items.missing.push(lang_items::EhUnwindResumeLangItem);
-    }
-
-    {
-        let mut cx = Context { tcx, items };
-        tcx.hir().krate().visit_all_item_likes(&mut cx.as_deep_visitor());
-    }
-    verify(tcx, items);
-}
-
-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
-        }
-    })
-}
-
-/// Returns `true` if the specified `lang_item` doesn't actually need to be
-/// present for this compilation.
-///
-/// Not all lang items are always required for each compilation, particularly in
-/// the case of panic=abort. In these situations some lang items are injected by
-/// crates and don't actually need to be defined in libstd.
-pub fn whitelisted(tcx: TyCtxt<'_>, lang_item: lang_items::LangItem) -> bool {
-    // If we're not compiling with unwinding, we won't actually need these
-    // symbols. Other panic runtimes ensure that the relevant symbols are
-    // available to link things together, but they're never exercised.
-    if tcx.sess.panic_strategy() != PanicStrategy::Unwind {
-        return lang_item == lang_items::EhPersonalityLangItem ||
-            lang_item == lang_items::EhUnwindResumeLangItem
-    }
-
-    false
-}
-
-fn verify<'tcx>(tcx: TyCtxt<'tcx>,
-                    items: &lang_items::LanguageItems) {
-    // We only need to check for the presence of weak lang items if we're
-    // emitting something that's not an rlib.
-    let needs_check = tcx.sess.crate_types.borrow().iter().any(|kind| {
-        match *kind {
-            config::CrateType::Dylib |
-            config::CrateType::ProcMacro |
-            config::CrateType::Cdylib |
-            config::CrateType::Executable |
-            config::CrateType::Staticlib => true,
-            config::CrateType::Rlib => false,
-        }
-    });
-    if !needs_check {
-        return
-    }
-
-    let mut missing = FxHashSet::default();
-    for &cnum in tcx.crates().iter() {
-        for &item in tcx.missing_lang_items(cnum).iter() {
-            missing.insert(item);
-        }
-    }
-
-    $(
-        if missing.contains(&lang_items::$item) &&
-           !whitelisted(tcx, lang_items::$item) &&
-           items.$name().is_none() {
-            if lang_items::$item == lang_items::PanicImplLangItem {
-                tcx.sess.err(&format!("`#[panic_handler]` function required, \
-                                       but not found"));
-            } else if lang_items::$item == lang_items::OomLangItem {
-                tcx.sess.err(&format!("`#[alloc_error_handler]` function required, \
-                                       but not found"));
-            } else {
-                tcx.sess.err(&format!("language item required, but not found: `{}`",
-                                      stringify!($name)));
-            }
-        }
-    )*
-}
-
-impl<'a, 'tcx> Context<'a, 'tcx> {
-    fn register(&mut self, name: Symbol, span: Span) {
-        $(if name == sym::$name {
-            if self.items.$name().is_none() {
-                self.items.missing.push(lang_items::$item);
-            }
-        } else)* {
-            struct_span_err!(
-                self.tcx.sess, span, E0264,
-                "unknown external lang item: `{}`",
-                name
-            )
-            .emit();
-        }
-    }
-}
-
-impl<'a, 'tcx, 'v> Visitor<'v> for Context<'a, 'tcx> {
-    type Map = Map<'v>;
-
-    fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, Map<'v>> {
-        NestedVisitorMap::None
-    }
-
-    fn visit_foreign_item(&mut self, i: &hir::ForeignItem<'_>) {
-        if let Some((lang_item, _)) = lang_items::extract(&i.attrs) {
-            self.register(lang_item, i.span);
-        }
-        intravisit::walk_foreign_item(self, i)
-    }
-}
-
-impl<'tcx> TyCtxt<'tcx> {
-    pub fn is_weak_lang_item(&self, item_def_id: DefId) -> bool {
-        let lang_items = self.lang_items();
-        let did = Some(item_def_id);
-
-        $(lang_items.$name() == did)||*
-    }
-}
-
-) }
-
-weak_lang_items! {
-    panic_impl,         PanicImplLangItem,          rust_begin_unwind;
-    eh_personality,     EhPersonalityLangItem,      rust_eh_personality;
-    eh_unwind_resume,   EhUnwindResumeLangItem,     rust_eh_unwind_resume;
-    oom,                OomLangItem,                rust_oom;
-}