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1 | // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | use dep_graph::DepNode; | |
12 | use hir::def_id::DefId; | |
13 | use ty::{self, Ty, TypeFoldable, Substs}; | |
14 | use util::ppaux; | |
15 | ||
16 | use std::fmt; | |
17 | ||
18 | #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)] | |
19 | pub struct Instance<'tcx> { | |
20 | pub def: InstanceDef<'tcx>, | |
21 | pub substs: &'tcx Substs<'tcx>, | |
22 | } | |
23 | ||
24 | #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)] | |
25 | pub enum InstanceDef<'tcx> { | |
26 | Item(DefId), | |
27 | Intrinsic(DefId), | |
28 | // <fn() as FnTrait>::call_* | |
29 | // def-id is FnTrait::call_* | |
30 | FnPtrShim(DefId, Ty<'tcx>), | |
31 | // <Trait as Trait>::fn | |
32 | Virtual(DefId, usize), | |
33 | // <[mut closure] as FnOnce>::call_once | |
34 | ClosureOnceShim { call_once: DefId }, | |
35 | // drop_in_place::<T>; None for empty drop glue. | |
36 | DropGlue(DefId, Option<Ty<'tcx>>), | |
37 | } | |
38 | ||
39 | impl<'tcx> InstanceDef<'tcx> { | |
40 | #[inline] | |
41 | pub fn def_id(&self) -> DefId { | |
42 | match *self { | |
43 | InstanceDef::Item(def_id) | | |
44 | InstanceDef::FnPtrShim(def_id, _) | | |
45 | InstanceDef::Virtual(def_id, _) | | |
46 | InstanceDef::Intrinsic(def_id, ) | | |
47 | InstanceDef::ClosureOnceShim { call_once: def_id } | |
48 | => def_id, | |
49 | InstanceDef::DropGlue(def_id, _) => def_id | |
50 | } | |
51 | } | |
52 | ||
53 | #[inline] | |
54 | pub fn def_ty<'a>(&self, tcx: ty::TyCtxt<'a, 'tcx, 'tcx>) -> Ty<'tcx> { | |
55 | tcx.item_type(self.def_id()) | |
56 | } | |
57 | ||
58 | #[inline] | |
59 | pub fn attrs<'a>(&self, tcx: ty::TyCtxt<'a, 'tcx, 'tcx>) -> ty::Attributes<'tcx> { | |
60 | tcx.get_attrs(self.def_id()) | |
61 | } | |
62 | ||
63 | pub(crate) fn dep_node(&self) -> DepNode<DefId> { | |
64 | // HACK: def-id binning, project-style; someone replace this with | |
65 | // real on-demand. | |
66 | let ty = match self { | |
67 | &InstanceDef::FnPtrShim(_, ty) => Some(ty), | |
68 | &InstanceDef::DropGlue(_, ty) => ty, | |
69 | _ => None | |
70 | }.into_iter(); | |
71 | ||
72 | DepNode::MirShim( | |
73 | Some(self.def_id()).into_iter().chain( | |
74 | ty.flat_map(|t| t.walk()).flat_map(|t| match t.sty { | |
75 | ty::TyAdt(adt_def, _) => Some(adt_def.did), | |
76 | ty::TyProjection(ref proj) => Some(proj.trait_ref.def_id), | |
77 | _ => None, | |
78 | }) | |
79 | ).collect() | |
80 | ) | |
81 | } | |
82 | } | |
83 | ||
84 | impl<'tcx> fmt::Display for Instance<'tcx> { | |
85 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { | |
86 | ppaux::parameterized(f, self.substs, self.def_id(), &[])?; | |
87 | match self.def { | |
88 | InstanceDef::Item(_) => Ok(()), | |
89 | InstanceDef::Intrinsic(_) => { | |
90 | write!(f, " - intrinsic") | |
91 | } | |
92 | InstanceDef::Virtual(_, num) => { | |
93 | write!(f, " - shim(#{})", num) | |
94 | } | |
95 | InstanceDef::FnPtrShim(_, ty) => { | |
96 | write!(f, " - shim({:?})", ty) | |
97 | } | |
98 | InstanceDef::ClosureOnceShim { .. } => { | |
99 | write!(f, " - shim") | |
100 | } | |
101 | InstanceDef::DropGlue(_, ty) => { | |
102 | write!(f, " - shim({:?})", ty) | |
103 | } | |
104 | } | |
105 | } | |
106 | } | |
107 | ||
108 | impl<'a, 'b, 'tcx> Instance<'tcx> { | |
109 | pub fn new(def_id: DefId, substs: &'tcx Substs<'tcx>) | |
110 | -> Instance<'tcx> { | |
111 | assert!(substs.is_normalized_for_trans() && !substs.has_escaping_regions(), | |
112 | "substs of instance {:?} not normalized for trans: {:?}", | |
113 | def_id, substs); | |
114 | Instance { def: InstanceDef::Item(def_id), substs: substs } | |
115 | } | |
116 | ||
117 | pub fn mono(tcx: ty::TyCtxt<'a, 'tcx, 'b>, def_id: DefId) -> Instance<'tcx> { | |
118 | Instance::new(def_id, tcx.global_tcx().empty_substs_for_def_id(def_id)) | |
119 | } | |
120 | ||
121 | #[inline] | |
122 | pub fn def_id(&self) -> DefId { | |
123 | self.def.def_id() | |
124 | } | |
125 | } |