SIGILLなテスト #2
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bug
Something isn't working
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多分次のコードで再現するはず： #[cfg(test)]
mod test {
#[test]
fn test() {
pretty_size(0);
}
fn pretty_size(bytes: usize) -> String {
let mut buf = [0u8; 5];
let mut rest = bytes;
let mut head_index: Option<NonZeroUsize> = None;
write_numeric_char(bytes, 1000, &mut buf, 0, &mut rest, &mut head_index);
write_numeric_char(bytes, 100, &mut buf, 1, &mut rest, &mut head_index);
write_numeric_char(bytes, 10, &mut buf, 2, &mut rest, &mut head_index);
write_numeric_char(bytes, 1, &mut buf, 3, &mut rest, &mut head_index);
buf[4] = b'B';
let head = unsafe { head_index.unwrap_unchecked() }.get() - 1;
unsafe { std::str::from_utf8_unchecked(&buf[head..]).to_string() }
}
fn write_numeric_char(n: usize, pow: usize, bytes: &mut [u8], byte_index: usize, r: &mut usize, head: &mut Option<NonZeroUsize>) {
if n >= pow {
bytes[byte_index] = convert_to_numeric_char(*r / pow);
*r -= *r / pow * pow;
head.get_or_insert_with(|| (unsafe { NonZeroUsize::new_unchecked(byte_index + 1) }));
}
}
fn convert_to_numeric_char(a: usize) -> u8 {
match a {
0 => b'0',
1 => b'1',
2 => b'2',
3 => b'3',
4 => b'4',
5 => b'5',
6 => b'6',
7 => b'7',
8 => b'8',
9 => b'9',
_ => unreachable!("{}", a)
}
}
} |
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ただのUBだった |
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Merged
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ときたま再現するの謎。 rust-lang/rust#69558 あたりが関連している？
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