1 files changed, 38 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_gcc/src/mono_item.rs b/compiler/rustc_codegen_gcc/src/mono_item.rs
new file mode 100644
index 000000000..9468a1ef4
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/src/mono_item.rs
@@ -0,0 +1,38 @@
+use rustc_codegen_ssa::traits::PreDefineMethods;
+use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
+use rustc_middle::mir::mono::{Linkage, Visibility};
+use rustc_middle::ty::{self, Instance, TypeVisitable};
+use rustc_middle::ty::layout::{FnAbiOf, LayoutOf};
+use rustc_span::def_id::DefId;
+
+use crate::base;
+use crate::context::CodegenCx;
+use crate::type_of::LayoutGccExt;
+
+impl<'gcc, 'tcx> PreDefineMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
+    fn predefine_static(&self, def_id: DefId, _linkage: Linkage, _visibility: Visibility, symbol_name: &str) {
+        let attrs = self.tcx.codegen_fn_attrs(def_id);
+        let instance = Instance::mono(self.tcx, def_id);
+        let ty = instance.ty(self.tcx, ty::ParamEnv::reveal_all());
+        let gcc_type = self.layout_of(ty).gcc_type(self, true);
+
+        let is_tls = attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL);
+        let global = self.define_global(symbol_name, gcc_type, is_tls, attrs.link_section);
+
+        // TODO(antoyo): set linkage and visibility.
+        self.instances.borrow_mut().insert(instance, global);
+    }
+
+    fn predefine_fn(&self, instance: Instance<'tcx>, linkage: Linkage, _visibility: Visibility, symbol_name: &str) {
+        assert!(!instance.substs.needs_infer());
+
+        let fn_abi = self.fn_abi_of_instance(instance, ty::List::empty());
+        self.linkage.set(base::linkage_to_gcc(linkage));
+        let _decl = self.declare_fn(symbol_name, &fn_abi);
+        //let attrs = self.tcx.codegen_fn_attrs(instance.def_id());
+
+        // TODO(antoyo): call set_link_section() to allow initializing argc/argv.
+        // TODO(antoyo): set unique comdat.
+        // TODO(antoyo): use inline attribute from there in linkage.set() above.
+    }
+}