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make svh independent of item ordering
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// Copyright 2012-2014 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. | ||
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use rustc::hir::def_id::DefId; | ||
use rustc::ty::TyCtxt; | ||
use rustc::util::nodemap::DefIdMap; | ||
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pub struct DefPathHashes<'a, 'tcx: 'a> { | ||
tcx: TyCtxt<'a, 'tcx, 'tcx>, | ||
data: DefIdMap<u64>, | ||
} | ||
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impl<'a, 'tcx> DefPathHashes<'a, 'tcx> { | ||
pub fn new(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Self { | ||
DefPathHashes { | ||
tcx: tcx, | ||
data: DefIdMap() | ||
} | ||
} | ||
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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) | ||
}) | ||
} | ||
} |
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