compiler/rustc_codegen_cranelift/src/linkage.rs

   1 use rustc_middle::mir::mono::{Linkage as RLinkage, MonoItem, Visibility};
   2
   3 use crate::prelude::*;
   4
   5 pub(crate) fn get_clif_linkage(
   6     mono_item: MonoItem<'_>,
   7     linkage: RLinkage,
   8     visibility: Visibility,
   9     is_compiler_builtins: bool,
  10 ) -> Linkage {
  11     match (linkage, visibility) {
  12         (RLinkage::External, Visibility::Default) if is_compiler_builtins => Linkage::Hidden,
  13         (RLinkage::External, Visibility::Default) => Linkage::Export,
  14         (RLinkage::Internal, Visibility::Default) => Linkage::Local,
  15         (RLinkage::External, Visibility::Hidden) => Linkage::Hidden,
  16         (RLinkage::WeakAny, Visibility::Default) => Linkage::Preemptible,
  17         _ => panic!("{:?} = {:?} {:?}", mono_item, linkage, visibility),
  18     }
  19 }
  20
  21 pub(crate) fn get_static_linkage(tcx: TyCtxt<'_>, def_id: DefId) -> Linkage {
  22     let fn_attrs = tcx.codegen_fn_attrs(def_id);
  23
  24     if let Some(linkage) = fn_attrs.linkage {
  25         match linkage {
  26             RLinkage::External => Linkage::Export,
  27             RLinkage::Internal => Linkage::Local,
  28             RLinkage::ExternalWeak | RLinkage::WeakAny => Linkage::Preemptible,
  29             _ => panic!("{:?}", linkage),
  30         }
  31     } else if tcx.is_reachable_non_generic(def_id) {
  32         Linkage::Export
  33     } else {
  34         Linkage::Hidden
  35     }
  36 }