| // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| //! Walks the crate looking for items/impl-items/trait-items that have |
| //! either a `rustc_symbol_name` or `rustc_item_path` attribute and |
| //! generates an error giving, respectively, the symbol name or |
| //! item-path. This is used for unit testing the code that generates |
| //! paths etc in all kinds of annoying scenarios. |
| |
| use asm; |
| use attributes; |
| use base; |
| use consts; |
| use context::CodegenCx; |
| use declare; |
| use llvm; |
| use monomorphize::Instance; |
| use type_of::LayoutLlvmExt; |
| use rustc::hir; |
| use rustc::hir::def::Def; |
| use rustc::hir::def_id::{DefId, LOCAL_CRATE}; |
| use rustc::mir::mono::{Linkage, Visibility}; |
| use rustc::ty::TypeFoldable; |
| use rustc::ty::layout::LayoutOf; |
| use std::fmt; |
| |
| pub use rustc::mir::mono::MonoItem; |
| |
| pub use rustc_mir::monomorphize::item::MonoItemExt as BaseMonoItemExt; |
| |
| pub trait MonoItemExt<'a, 'tcx>: fmt::Debug + BaseMonoItemExt<'a, 'tcx> { |
| fn define(&self, cx: &CodegenCx<'a, 'tcx>) { |
| debug!("BEGIN IMPLEMENTING '{} ({})' in cgu {}", |
| self.to_string(cx.tcx), |
| self.to_raw_string(), |
| cx.codegen_unit.name()); |
| |
| match *self.as_mono_item() { |
| MonoItem::Static(def_id) => { |
| let tcx = cx.tcx; |
| let is_mutable = match tcx.describe_def(def_id) { |
| Some(Def::Static(_, is_mutable)) => is_mutable, |
| Some(other) => { |
| bug!("Expected Def::Static, found {:?}", other) |
| } |
| None => { |
| bug!("Expected Def::Static for {:?}, found nothing", def_id) |
| } |
| }; |
| consts::codegen_static(&cx, def_id, is_mutable); |
| } |
| MonoItem::GlobalAsm(node_id) => { |
| let item = cx.tcx.hir.expect_item(node_id); |
| if let hir::ItemKind::GlobalAsm(ref ga) = item.node { |
| asm::codegen_global_asm(cx, ga); |
| } else { |
| span_bug!(item.span, "Mismatch between hir::Item type and MonoItem type") |
| } |
| } |
| MonoItem::Fn(instance) => { |
| base::codegen_instance(&cx, instance); |
| } |
| } |
| |
| debug!("END IMPLEMENTING '{} ({})' in cgu {}", |
| self.to_string(cx.tcx), |
| self.to_raw_string(), |
| cx.codegen_unit.name()); |
| } |
| |
| fn predefine(&self, |
| cx: &CodegenCx<'a, 'tcx>, |
| linkage: Linkage, |
| visibility: Visibility) { |
| debug!("BEGIN PREDEFINING '{} ({})' in cgu {}", |
| self.to_string(cx.tcx), |
| self.to_raw_string(), |
| cx.codegen_unit.name()); |
| |
| let symbol_name = self.symbol_name(cx.tcx).as_str(); |
| |
| debug!("symbol {}", &symbol_name); |
| |
| match *self.as_mono_item() { |
| MonoItem::Static(def_id) => { |
| predefine_static(cx, def_id, linkage, visibility, &symbol_name); |
| } |
| MonoItem::Fn(instance) => { |
| predefine_fn(cx, instance, linkage, visibility, &symbol_name); |
| } |
| MonoItem::GlobalAsm(..) => {} |
| } |
| |
| debug!("END PREDEFINING '{} ({})' in cgu {}", |
| self.to_string(cx.tcx), |
| self.to_raw_string(), |
| cx.codegen_unit.name()); |
| } |
| |
| fn to_raw_string(&self) -> String { |
| match *self.as_mono_item() { |
| MonoItem::Fn(instance) => { |
| format!("Fn({:?}, {})", |
| instance.def, |
| instance.substs.as_ptr() as usize) |
| } |
| MonoItem::Static(id) => { |
| format!("Static({:?})", id) |
| } |
| MonoItem::GlobalAsm(id) => { |
| format!("GlobalAsm({:?})", id) |
| } |
| } |
| } |
| } |
| |
| impl<'a, 'tcx> MonoItemExt<'a, 'tcx> for MonoItem<'tcx> {} |
| |
| fn predefine_static<'a, 'tcx>(cx: &CodegenCx<'a, 'tcx>, |
| def_id: DefId, |
| linkage: Linkage, |
| visibility: Visibility, |
| symbol_name: &str) { |
| let instance = Instance::mono(cx.tcx, def_id); |
| let ty = instance.ty(cx.tcx); |
| let llty = cx.layout_of(ty).llvm_type(cx); |
| |
| let g = declare::define_global(cx, symbol_name, llty).unwrap_or_else(|| { |
| cx.sess().span_fatal(cx.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)); |
| } |
| |
| cx.instances.borrow_mut().insert(instance, g); |
| cx.statics.borrow_mut().insert(g, def_id); |
| } |
| |
| fn predefine_fn<'a, 'tcx>(cx: &CodegenCx<'a, 'tcx>, |
| instance: Instance<'tcx>, |
| linkage: Linkage, |
| visibility: Visibility, |
| symbol_name: &str) { |
| assert!(!instance.substs.needs_infer() && |
| !instance.substs.has_param_types()); |
| |
| let mono_ty = instance.ty(cx.tcx); |
| let attrs = cx.tcx.codegen_fn_attrs(instance.def_id()); |
| let lldecl = declare::declare_fn(cx, symbol_name, mono_ty); |
| unsafe { llvm::LLVMRustSetLinkage(lldecl, base::linkage_to_llvm(linkage)) }; |
| base::set_link_section(lldecl, &attrs); |
| if linkage == Linkage::LinkOnceODR || |
| linkage == Linkage::WeakODR { |
| llvm::SetUniqueComdat(cx.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 && |
| cx.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_ty = {:?} instance = {:?}", mono_ty, instance); |
| if instance.def.is_inline(cx.tcx) { |
| attributes::inline(lldecl, attributes::InlineAttr::Hint); |
| } |
| attributes::from_fn_attrs(cx, lldecl, instance.def.def_id()); |
| |
| cx.instances.borrow_mut().insert(instance, lldecl); |
| } |