4 use crate::context::CodegenCx;
6 use crate::type_of::LayoutLlvmExt;
7 use rustc::hir::def_id::{DefId, LOCAL_CRATE};
8 use rustc::mir::mono::{Linkage, Visibility};
9 use rustc::ty::{TypeFoldable, Instance};
10 use rustc::ty::layout::{FnAbiExt, LayoutOf};
11 use rustc_codegen_ssa::traits::*;
13 pub use rustc::mir::mono::MonoItem;
15 impl PreDefineMethods<'tcx> for CodegenCx<'ll, 'tcx> {
16 fn predefine_static(&self,
19 visibility: Visibility,
21 let instance = Instance::mono(self.tcx, def_id);
22 let ty = instance.ty(self.tcx);
23 let llty = self.layout_of(ty).llvm_type(self);
25 let g = self.define_global(symbol_name, llty).unwrap_or_else(|| {
26 self.sess().span_fatal(self.tcx.def_span(def_id),
27 &format!("symbol `{}` is already defined", symbol_name))
31 llvm::LLVMRustSetLinkage(g, base::linkage_to_llvm(linkage));
32 llvm::LLVMRustSetVisibility(g, base::visibility_to_llvm(visibility));
35 self.instances.borrow_mut().insert(instance, g);
38 fn predefine_fn(&self,
39 instance: Instance<'tcx>,
41 visibility: Visibility,
43 assert!(!instance.substs.needs_infer() &&
44 !instance.substs.has_param_types());
46 let fn_abi = FnAbi::of_instance(self, instance, &[]);
47 let lldecl = self.declare_fn(symbol_name, &fn_abi);
48 unsafe { llvm::LLVMRustSetLinkage(lldecl, base::linkage_to_llvm(linkage)) };
49 let attrs = self.tcx.codegen_fn_attrs(instance.def_id());
50 base::set_link_section(lldecl, &attrs);
51 if linkage == Linkage::LinkOnceODR ||
52 linkage == Linkage::WeakODR {
53 llvm::SetUniqueComdat(self.llmod, lldecl);
56 // If we're compiling the compiler-builtins crate, e.g., the equivalent of
57 // compiler-rt, then we want to implicitly compile everything with hidden
58 // visibility as we're going to link this object all over the place but
59 // don't want the symbols to get exported.
60 if linkage != Linkage::Internal && linkage != Linkage::Private &&
61 self.tcx.is_compiler_builtins(LOCAL_CRATE) {
63 llvm::LLVMRustSetVisibility(lldecl, llvm::Visibility::Hidden);
67 llvm::LLVMRustSetVisibility(lldecl, base::visibility_to_llvm(visibility));
71 debug!("predefine_fn: instance = {:?}", instance);
73 attributes::from_fn_attrs(self, lldecl, instance, &fn_abi);
75 self.instances.borrow_mut().insert(instance, lldecl);