1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
use hir::map as hir_map;
use rustc::hir;
use rustc::hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
use rustc::ty::query::Providers;
use rustc::ty::subst::UnpackedKind;
use rustc::ty::{self, CratePredicatesMap, TyCtxt};
use rustc_data_structures::sync::Lrc;
mod explicit;
mod implicit_infer;
pub mod test;
mod utils;
pub fn provide(providers: &mut Providers) {
*providers = Providers {
inferred_outlives_of,
inferred_outlives_crate,
..*providers
};
}
fn inferred_outlives_of<'a, 'tcx>(
tcx: TyCtxt<'a, 'tcx, 'tcx>,
item_def_id: DefId,
) -> Lrc<Vec<ty::Predicate<'tcx>>> {
let id = tcx
.hir
.as_local_node_id(item_def_id)
.expect("expected local def-id");
match tcx.hir.get(id) {
hir_map::NodeItem(item) => match item.node {
hir::ItemStruct(..) | hir::ItemEnum(..) | hir::ItemUnion(..) => {
let crate_map = tcx.inferred_outlives_crate(LOCAL_CRATE);
let predicates = crate_map
.predicates
.get(&item_def_id)
.unwrap_or(&crate_map.empty_predicate)
.clone();
if tcx.has_attr(item_def_id, "rustc_outlives") {
let mut pred: Vec<String> = predicates
.iter()
.map(|out_pred| match out_pred {
ty::Predicate::RegionOutlives(p) => format!("{}", &p),
ty::Predicate::TypeOutlives(p) => format!("{}", &p),
err => bug!("unexpected predicate {:?}", err),
})
.collect();
pred.sort();
let span = tcx.def_span(item_def_id);
let mut err = tcx.sess.struct_span_err(span, "rustc_outlives");
for p in &pred {
err.note(p);
}
err.emit();
}
predicates
}
_ => Lrc::new(Vec::new()),
},
_ => Lrc::new(Vec::new()),
}
}
fn inferred_outlives_crate<'tcx>(
tcx: TyCtxt<'_, 'tcx, 'tcx>,
crate_num: CrateNum,
) -> Lrc<CratePredicatesMap<'tcx>> {
let exp = explicit::explicit_predicates(tcx, crate_num);
let global_inferred_outlives = implicit_infer::infer_predicates(tcx, &exp);
let predicates = global_inferred_outlives
.iter()
.map(|(&def_id, set)| {
let vec: Vec<ty::Predicate<'tcx>> = set
.iter()
.map(
|ty::OutlivesPredicate(kind1, region2)| match kind1.unpack() {
UnpackedKind::Type(ty1) => ty::Predicate::TypeOutlives(ty::Binder::bind(
ty::OutlivesPredicate(ty1, region2),
)),
UnpackedKind::Lifetime(region1) => ty::Predicate::RegionOutlives(
ty::Binder::bind(ty::OutlivesPredicate(region1, region2)),
),
},
)
.collect();
(def_id, Lrc::new(vec))
})
.collect();
let empty_predicate = Lrc::new(Vec::new());
Lrc::new(ty::CratePredicatesMap {
predicates,
empty_predicate,
})
}