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
use rustc::hir::def_id::DefId;
use rustc::ty::TyCtxt;
use rustc::util::nodemap::DefIdMap;
pub struct DefPathHashes<'a, 'tcx: 'a> {
tcx: TyCtxt<'a, 'tcx, 'tcx>,
data: DefIdMap<u64>,
}
impl<'a, 'tcx> DefPathHashes<'a, 'tcx> {
pub fn new(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Self {
DefPathHashes {
tcx: tcx,
data: DefIdMap()
}
}
pub fn hash(&mut self, def_id: DefId) -> u64 {
let tcx = self.tcx;
*self.data.entry(def_id)
.or_insert_with(|| {
let def_path = tcx.def_path(def_id);
def_path.deterministic_hash(tcx)
})
}
}