2
0
Fork 0
mirror of https://github.com/rust-lang/rust-clippy synced 2024-12-19 01:24:05 +00:00
rust-clippy/tests/ui/transmute_null_to_fn.rs

42 lines
1.4 KiB
Rust

#![allow(dead_code)]
#![warn(clippy::transmute_null_to_fn)]
#![allow(clippy::zero_ptr)]
// Easy to lint because these only span one line.
fn one_liners() {
unsafe {
let _: fn() = std::mem::transmute(0 as *const ());
//~^ ERROR: transmuting a known null pointer into a function pointer
let _: fn() = std::mem::transmute(std::ptr::null::<()>());
//~^ ERROR: transmuting a known null pointer into a function pointer
}
}
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 _: fn() = std::mem::transmute(ZPTR);
//~^ ERROR: transmuting a known null pointer into a function pointer
// Should NOT raise a lint.
let _: fn() = std::mem::transmute(NOT_ZPTR);
}
}
fn issue_11485() {
unsafe {
let _: fn() = std::mem::transmute(0 as *const u8 as *const ());
//~^ ERROR: transmuting a known null pointer into a function pointer
let _: fn() = std::mem::transmute(std::ptr::null::<()>() as *const u8);
//~^ ERROR: transmuting a known null pointer into a function pointer
let _: fn() = std::mem::transmute(ZPTR as *const u8);
//~^ ERROR: transmuting a known null pointer into a function pointer
}
}
fn main() {
one_liners();
transmute_const();
}