3 use crate::context::CodegenCx;
5 use crate::type_of::LayoutLlvmExt;
6 use rustc::hir::def_id::{DefId, LOCAL_CRATE};
7 use rustc::mir::mono::{Linkage, Visibility};
8 use rustc::ty::{TypeFoldable, Instance};
9 use rustc::ty::layout::{LayoutOf, HasTyCtxt};
10 use rustc_codegen_ssa::traits::*;
12 pub use rustc::mir::mono::MonoItem;
14 impl PreDefineMethods<'tcx> for CodegenCx<'ll, 'tcx> {
15 fn predefine_static(&self,
18 visibility: Visibility,
20 let instance = Instance::mono(self.tcx, def_id);
21 let ty = instance.ty(self.tcx);
22 let llty = self.layout_of(ty).llvm_type(self);
24 let g = self.define_global(symbol_name, llty).unwrap_or_else(|| {
25 self.sess().span_fatal(self.tcx.def_span(def_id),
26 &format!("symbol `{}` is already defined", symbol_name))
30 llvm::LLVMRustSetLinkage(g, base::linkage_to_llvm(linkage));
31 llvm::LLVMRustSetVisibility(g, base::visibility_to_llvm(visibility));
34 self.instances.borrow_mut().insert(instance, g);
37 fn predefine_fn(&self,
38 instance: Instance<'tcx>,
40 visibility: Visibility,
42 assert!(!instance.substs.needs_infer() &&
43 !instance.substs.has_param_types());
45 let mono_sig = instance.fn_sig(self.tcx());
46 let attrs = self.tcx.codegen_fn_attrs(instance.def_id());
47 let lldecl = self.declare_fn(symbol_name, mono_sig);
48 unsafe { llvm::LLVMRustSetLinkage(lldecl, base::linkage_to_llvm(linkage)) };
49 base::set_link_section(lldecl, &attrs);
50 if linkage == Linkage::LinkOnceODR ||
51 linkage == Linkage::WeakODR {
52 llvm::SetUniqueComdat(self.llmod, lldecl);
55 // If we're compiling the compiler-builtins crate, e.g., the equivalent of
56 // compiler-rt, then we want to implicitly compile everything with hidden
57 // visibility as we're going to link this object all over the place but
58 // don't want the symbols to get exported.
59 if linkage != Linkage::Internal && linkage != Linkage::Private &&
60 self.tcx.is_compiler_builtins(LOCAL_CRATE) {
62 llvm::LLVMRustSetVisibility(lldecl, llvm::Visibility::Hidden);
66 llvm::LLVMRustSetVisibility(lldecl, base::visibility_to_llvm(visibility));
70 debug!("predefine_fn: mono_sig = {:?} instance = {:?}", mono_sig, instance);
71 if instance.def.is_inline(self.tcx) {
72 attributes::inline(self, lldecl, attributes::InlineAttr::Hint);
74 attributes::from_fn_attrs(
77 Some(instance.def.def_id()),
81 self.instances.borrow_mut().insert(instance, lldecl);