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rustc: implement arithmetic overflow checking

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Adds overflow checking to integer addition, multiplication, and subtraction
when `-Z force-overflow-checks` is true, or if `--cfg ndebug` is not passed to
the compiler. On overflow, it panics with `arithmetic operation overflowed`.
Also adds `overflowing_add`, `overflowing_sub`, and `overflowing_mul`
intrinsics for doing unchecked arithmetic.

[breaking-change]
This commit is contained in:
Corey Richardson 2015-01-06 00:56:30 -05:00 • committed by Felix S. Klock II
parent 00ccc7af1e
commit cdfff9db35
10 changed files with 203 additions and 7 deletions
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15
src/test/run-fail/overflowing-add.rs Normal file
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// Copyright 2015 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.
// error-pattern:thread '<main>' panicked at 'arithmatic operation overflowed'
fn main() {
let x = 200u8 + 200u8 + 200u8;
}

15
src/test/run-fail/overflowing-mul.rs Normal file
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// Copyright 2015 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.
// error-pattern:thread '<main>' panicked at 'arithmatic operation overflowed'
fn main() {
let x = 200u8 + 4u8;
}

15
src/test/run-fail/overflowing-sub.rs Normal file
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// Copyright 2015 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.
// error-pattern:thread '<main>' panicked at 'arithmatic operation overflowed'
fn main() {
let x = 42u8 - 43u8;
}