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