rust/tests/ui/transmuting_null.rs
Félix Fischer 069957a8ad Add TransmutingNull Lint
* Late Lint pass, catches:
  * One liner: 0 -> null -> transmute
  * One liner: std:null() -> transmute
  * Const (which resolves to null) -> transmute
* UI Test case for Lint
* Updated test for issue 3849, because now the lint that code generated is in Clippy.
* Expanded `const.rs` miri-based Constant Folding code, to cover
  raw pointers
2019-04-02 11:39:43 -03:00

31 lines
735 B
Rust

#![allow(dead_code)]
#![warn(clippy::transmuting_null)]
#![allow(clippy::zero_ptr)]
#![allow(clippy::transmute_ptr_to_ref)]
#![allow(clippy::eq_op)]
// Easy to lint because these only span one line.
fn one_liners() {
unsafe {
let _: &u64 = std::mem::transmute(0 as *const u64);
let _: &u64 = std::mem::transmute(std::ptr::null::<u64>());
}
}
pub const ZPTR: *const usize = 0 as *const _;
pub const NOT_ZPTR: *const usize = 1 as *const _;
fn transmute_const() {
unsafe {
// Should raise a lint.
let _: &u64 = std::mem::transmute(ZPTR);
// Should NOT raise a lint.
let _: &u64 = std::mem::transmute(NOT_ZPTR);
}
}
fn main() {
one_liners();
transmute_const();
}