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// 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.
use dep_graph::DepNode;
use hir::def_id::DefId;
use ty::{self, Ty, TypeFoldable, Substs};
use util::ppaux;
use std::fmt;
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
pub struct Instance<'tcx> {
pub def: InstanceDef<'tcx>,
pub substs: &'tcx Substs<'tcx>,
}
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
pub enum InstanceDef<'tcx> {
Item(DefId),
Intrinsic(DefId),
// <fn() as FnTrait>::call_*
// def-id is FnTrait::call_*
FnPtrShim(DefId, Ty<'tcx>),
// <Trait as Trait>::fn
Virtual(DefId, usize),
// <[mut closure] as FnOnce>::call_once
ClosureOnceShim { call_once: DefId },
// drop_in_place::<T>; None for empty drop glue.
DropGlue(DefId, Option<Ty<'tcx>>),
}
impl<'tcx> InstanceDef<'tcx> {
#[inline]
pub fn def_id(&self) -> DefId {
match *self {
InstanceDef::Item(def_id) |
InstanceDef::FnPtrShim(def_id, _) |
InstanceDef::Virtual(def_id, _) |
InstanceDef::Intrinsic(def_id, ) |
InstanceDef::ClosureOnceShim { call_once: def_id }
=> def_id,
InstanceDef::DropGlue(def_id, _) => def_id
}
}
#[inline]
pub fn def_ty<'a>(&self, tcx: ty::TyCtxt<'a, 'tcx, 'tcx>) -> Ty<'tcx> {
tcx.type_of(self.def_id())
}
#[inline]
pub fn attrs<'a>(&self, tcx: ty::TyCtxt<'a, 'tcx, 'tcx>) -> ty::Attributes<'tcx> {
tcx.get_attrs(self.def_id())
}
pub(crate) fn dep_node(&self) -> DepNode<DefId> {
// HACK: def-id binning, project-style; someone replace this with
// real on-demand.
let ty = match self {
&InstanceDef::FnPtrShim(_, ty) => Some(ty),
&InstanceDef::DropGlue(_, ty) => ty,
_ => None
}.into_iter();
DepNode::MirShim(
Some(self.def_id()).into_iter().chain(
ty.flat_map(|t| t.walk()).flat_map(|t| match t.sty {
ty::TyAdt(adt_def, _) => Some(adt_def.did),
ty::TyProjection(ref proj) => Some(proj.trait_ref.def_id),
_ => None,
})
).collect()
)
}
}
impl<'tcx> fmt::Display for Instance<'tcx> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
ppaux::parameterized(f, self.substs, self.def_id(), &[])?;
match self.def {
InstanceDef::Item(_) => Ok(()),
InstanceDef::Intrinsic(_) => {
write!(f, " - intrinsic")
}
InstanceDef::Virtual(_, num) => {
write!(f, " - shim(#{})", num)
}
InstanceDef::FnPtrShim(_, ty) => {
write!(f, " - shim({:?})", ty)
}
InstanceDef::ClosureOnceShim { .. } => {
write!(f, " - shim")
}
InstanceDef::DropGlue(_, ty) => {
write!(f, " - shim({:?})", ty)
}
}
}
}
impl<'a, 'b, 'tcx> Instance<'tcx> {
pub fn new(def_id: DefId, substs: &'tcx Substs<'tcx>)
-> Instance<'tcx> {
assert!(substs.is_normalized_for_trans() && !substs.has_escaping_regions(),
"substs of instance {:?} not normalized for trans: {:?}",
def_id, substs);
Instance { def: InstanceDef::Item(def_id), substs: substs }
}
pub fn mono(tcx: ty::TyCtxt<'a, 'tcx, 'b>, def_id: DefId) -> Instance<'tcx> {
Instance::new(def_id, tcx.global_tcx().empty_substs_for_def_id(def_id))
}
#[inline]
pub fn def_id(&self) -> DefId {
self.def.def_id()
}
}
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