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         _ => panic!("{:?} = {:?} {:?}", mono_item, linkage, visibility),
  17     }
  18 }
  19
  20 pub(crate) fn get_static_linkage(tcx: TyCtxt<'_>, def_id: DefId) -> Linkage {
  21     let fn_attrs = tcx.codegen_fn_attrs(def_id);
  22
  23     if let Some(linkage) = fn_attrs.linkage {
  24         match linkage {
  25             RLinkage::External => Linkage::Export,
  26             RLinkage::Internal => Linkage::Local,
  27             RLinkage::ExternalWeak | RLinkage::WeakAny => Linkage::Preemptible,
  28             _ => panic!("{:?}", linkage),
  29         }
  30     } else if tcx.is_reachable_non_generic(def_id) {
  31         Linkage::Export
  32     } else {
  33         Linkage::Hidden
  34     }
  35 }