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Rollup merge of rust-lang#39628 - arielb1:shimmir, r=eddyb
Translate shims using MIR Still a work in progress.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| // 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::borrow::Cow; | ||
| use std::fmt; | ||
| use syntax::ast; | ||
|
|
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|
|
||
| #[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.item_type(self.def_id()) | ||
| } | ||
|
|
||
| #[inline] | ||
| pub fn attrs<'a>(&self, tcx: ty::TyCtxt<'a, 'tcx, 'tcx>) -> Cow<'tcx, [ast::Attribute]> { | ||
| 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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