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.
14 /// Depending on the target only one variant is ever used in a compilation.
15 /// Anything else is an error. This invariant is checked at several locations
16 #[derive(Copy, Clone, Debug, RustcEncodable, RustcDecodable, Hash, Eq, PartialEq)]
22 pub use self::ConstIsize::*;
25 pub fn as_i64(self, target_int_ty: ast::IntTy) -> i64 {
26 match (self, target_int_ty) {
27 (Is16(i), ast::IntTy::I16) => i as i64,
28 (Is32(i), ast::IntTy::I32) => i as i64,
29 (Is64(i), ast::IntTy::I64) => i,
30 _ => panic!("unable to convert self ({:?}) to target isize ({:?})",
34 pub fn new(i: i64, target_int_ty: ast::IntTy) -> Result<Self, ConstMathErr> {
36 ast::IntTy::I16 if i as i16 as i64 == i => Ok(Is16(i as i16)),
37 ast::IntTy::I16 => Err(LitOutOfRange(ast::IntTy::Is)),
38 ast::IntTy::I32 if i as i32 as i64 == i => Ok(Is32(i as i32)),
39 ast::IntTy::I32 => Err(LitOutOfRange(ast::IntTy::Is)),
40 ast::IntTy::I64 => Ok(Is64(i)),
44 pub fn new_truncating(i: i128, target_int_ty: ast::IntTy) -> Self {
46 ast::IntTy::I16 => Is16(i as i16),
47 ast::IntTy::I32 => Is32(i as i32),
48 ast::IntTy::I64 => Is64(i as i64),