1 // Copyright 2015 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.
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.
11 // Helpers for handling cast expressions, used in both
14 use middle::ty::{self, Ty};
18 /// Types that are represented as ints.
19 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
28 // Valid types for the result of a non-coercion cast
29 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
30 pub enum CastTy<'tcx> {
31 /// Various types that are represented as ints and handled mostly
32 /// in the same way, merged for easier matching.
34 /// Floating-Point types
39 Ptr(&'tcx ty::TypeAndMut<'tcx>),
41 RPtr(&'tcx ty::TypeAndMut<'tcx>),
44 /// Cast Kind. See RFC 401 (or librustc_typeck/check/cast.rs)
45 #[derive(Copy, Clone, Debug, RustcEncodable, RustcDecodable)]
60 impl<'tcx> CastTy<'tcx> {
61 pub fn from_ty(t: Ty<'tcx>) -> Option<CastTy<'tcx>> {
63 ty::TyBool => Some(CastTy::Int(IntTy::Bool)),
64 ty::TyChar => Some(CastTy::Int(IntTy::Char)),
65 ty::TyInt(_) => Some(CastTy::Int(IntTy::I)),
66 ty::TyUint(u) => Some(CastTy::Int(IntTy::U(u))),
67 ty::TyFloat(_) => Some(CastTy::Float),
68 ty::TyEnum(d,_) if d.is_payloadfree() =>
69 Some(CastTy::Int(IntTy::CEnum)),
70 ty::TyRawPtr(ref mt) => Some(CastTy::Ptr(mt)),
71 ty::TyRef(_, ref mt) => Some(CastTy::RPtr(mt)),
72 ty::TyBareFn(..) => Some(CastTy::FnPtr),