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// Copyright 2012-2016 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.
use syntax::parse::token::InternedString;
use syntax::ast;
use std::rc::Rc;
use hir::def_id::DefId;
use rustc_const_math::*;
use self::ConstVal::*;
#[derive(Clone, Debug, Hash, RustcEncodable, RustcDecodable, Eq, PartialEq)]
pub enum ConstVal {
Float(ConstFloat),
Integral(ConstInt),
Str(InternedString),
ByteStr(Rc<Vec<u8>>),
Bool(bool),
Struct(ast::NodeId),
Tuple(ast::NodeId),
Function(DefId),
Array(ast::NodeId, u64),
Repeat(ast::NodeId, u64),
Char(char),
/// A value that only occurs in case `eval_const_expr` reported an error. You should never
/// handle this case. Its sole purpose is to allow more errors to be reported instead of
/// causing a fatal error.
Dummy,
}
impl ConstVal {
pub fn description(&self) -> &'static str {
match *self {
Float(f) => f.description(),
Integral(i) => i.description(),
Str(_) => "string literal",
ByteStr(_) => "byte string literal",
Bool(_) => "boolean",
Struct(_) => "struct",
Tuple(_) => "tuple",
Function(_) => "function definition",
Array(..) => "array",
Repeat(..) => "repeat",
Char(..) => "char",
Dummy => "dummy value",
}
}
}
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