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1 | // Copyright 2012-2014 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 middle::ty::{self, IntVarValue, Ty}; | |
12 | use rustc_data_structures::unify::UnifyKey; | |
13 | use syntax::ast; | |
14 | ||
15 | pub trait ToType<'tcx> { | |
16 | fn to_type(&self, tcx: &ty::ctxt<'tcx>) -> Ty<'tcx>; | |
17 | } | |
18 | ||
19 | impl UnifyKey for ty::IntVid { | |
20 | type Value = Option<IntVarValue>; | |
21 | fn index(&self) -> u32 { self.index } | |
22 | fn from_index(i: u32) -> ty::IntVid { ty::IntVid { index: i } } | |
23 | fn tag(_: Option<ty::IntVid>) -> &'static str { "IntVid" } | |
24 | } | |
25 | ||
26 | impl<'tcx> ToType<'tcx> for IntVarValue { | |
27 | fn to_type(&self, tcx: &ty::ctxt<'tcx>) -> Ty<'tcx> { | |
28 | match *self { | |
c1a9b12d SL |
29 | ty::IntType(i) => tcx.mk_mach_int(i), |
30 | ty::UintType(i) => tcx.mk_mach_uint(i), | |
d9579d0f AL |
31 | } |
32 | } | |
33 | } | |
34 | ||
35 | // Floating point type keys | |
36 | ||
37 | impl UnifyKey for ty::FloatVid { | |
38 | type Value = Option<ast::FloatTy>; | |
39 | fn index(&self) -> u32 { self.index } | |
40 | fn from_index(i: u32) -> ty::FloatVid { ty::FloatVid { index: i } } | |
41 | fn tag(_: Option<ty::FloatVid>) -> &'static str { "FloatVid" } | |
42 | } | |
43 | ||
44 | impl<'tcx> ToType<'tcx> for ast::FloatTy { | |
45 | fn to_type(&self, tcx: &ty::ctxt<'tcx>) -> Ty<'tcx> { | |
c1a9b12d | 46 | tcx.mk_mach_float(*self) |
d9579d0f AL |
47 | } |
48 | } |