| use crate::attributes; |
| use crate::base; |
| use crate::context::CodegenCx; |
| use crate::llvm; |
| use crate::type_of::LayoutLlvmExt; |
| use rustc::hir::def_id::{DefId, LOCAL_CRATE}; |
| use rustc::mir::mono::{Linkage, Visibility}; |
| use rustc::ty::{TypeFoldable, Instance}; |
| use rustc::ty::layout::{LayoutOf, HasTyCtxt}; |
| use rustc_codegen_ssa::traits::*; |
| |
| pub use rustc::mir::mono::MonoItem; |
| |
| impl PreDefineMethods<'tcx> for CodegenCx<'ll, 'tcx> { |
| fn predefine_static(&self, |
| def_id: DefId, |
| linkage: Linkage, |
| visibility: Visibility, |
| symbol_name: &str) { |
| let instance = Instance::mono(self.tcx, def_id); |
| let ty = instance.ty(self.tcx); |
| let llty = self.layout_of(ty).llvm_type(self); |
| |
| let g = self.define_global(symbol_name, llty).unwrap_or_else(|| { |
| self.sess().span_fatal(self.tcx.def_span(def_id), |
| &format!("symbol `{}` is already defined", symbol_name)) |
| }); |
| |
| unsafe { |
| llvm::LLVMRustSetLinkage(g, base::linkage_to_llvm(linkage)); |
| llvm::LLVMRustSetVisibility(g, base::visibility_to_llvm(visibility)); |
| } |
| |
| self.instances.borrow_mut().insert(instance, g); |
| } |
| |
| fn predefine_fn(&self, |
| instance: Instance<'tcx>, |
| linkage: Linkage, |
| visibility: Visibility, |
| symbol_name: &str) { |
| assert!(!instance.substs.needs_infer() && |
| !instance.substs.has_param_types()); |
| |
| let mono_sig = instance.fn_sig(self.tcx()); |
| let attrs = self.tcx.codegen_fn_attrs(instance.def_id()); |
| let lldecl = self.declare_fn(symbol_name, mono_sig); |
| unsafe { llvm::LLVMRustSetLinkage(lldecl, base::linkage_to_llvm(linkage)) }; |
| base::set_link_section(lldecl, &attrs); |
| if linkage == Linkage::LinkOnceODR || |
| linkage == Linkage::WeakODR { |
| llvm::SetUniqueComdat(self.llmod, lldecl); |
| } |
| |
| // If we're compiling the compiler-builtins crate, e.g., the equivalent of |
| // compiler-rt, then we want to implicitly compile everything with hidden |
| // visibility as we're going to link this object all over the place but |
| // don't want the symbols to get exported. |
| if linkage != Linkage::Internal && linkage != Linkage::Private && |
| self.tcx.is_compiler_builtins(LOCAL_CRATE) { |
| unsafe { |
| llvm::LLVMRustSetVisibility(lldecl, llvm::Visibility::Hidden); |
| } |
| } else { |
| unsafe { |
| llvm::LLVMRustSetVisibility(lldecl, base::visibility_to_llvm(visibility)); |
| } |
| } |
| |
| debug!("predefine_fn: mono_sig = {:?} instance = {:?}", mono_sig, instance); |
| if instance.def.is_inline(self.tcx) { |
| attributes::inline(self, lldecl, attributes::InlineAttr::Hint); |
| } |
| attributes::from_fn_attrs( |
| self, |
| lldecl, |
| Some(instance.def.def_id()), |
| mono_sig, |
| ); |
| |
| self.instances.borrow_mut().insert(instance, lldecl); |
| } |
| } |