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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);
}
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 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(cx, lldecl, attributes::InlineAttr::Hint);
}
attributes::from_fn_attrs(cx, lldecl, Some(instance.def.def_id()));
cx.instances.borrow_mut().insert(instance, lldecl);
}