vendor/backtrace/tests/long_fn_name.rs

   1 use backtrace::Backtrace;
   2
   3 // 50-character module name
   4 mod _234567890_234567890_234567890_234567890_234567890 {
   5     // 50-character struct name
   6     #[allow(non_camel_case_types)]
   7     pub struct _234567890_234567890_234567890_234567890_234567890<T>(T);
   8     impl<T> _234567890_234567890_234567890_234567890_234567890<T> {
   9         #[allow(dead_code)]
  10         pub fn new() -> crate::Backtrace {
  11             crate::Backtrace::new()
  12         }
  13     }
  14 }
  15
  16 // Long function names must be truncated to (MAX_SYM_NAME - 1) characters.
  17 // Only run this test for msvc, since gnu prints "<no info>" for all frames.
  18 #[test]
  19 #[cfg(all(windows, target_env = "msvc"))]
  20 fn test_long_fn_name() {
  21     use _234567890_234567890_234567890_234567890_234567890::_234567890_234567890_234567890_234567890_234567890 as S;
  22
  23     // 10 repetitions of struct name, so fully qualified function name is
  24     // atleast 10 * (50 + 50) * 2 = 2000 characters long.
  25     // It's actually longer since it also includes `::`, `<>` and the
  26     // name of the current module
  27     let bt = S::<S<S<S<S<S<S<S<S<S<i32>>>>>>>>>>::new();
  28     println!("{:?}", bt);
  29
  30     let mut found_long_name_frame = false;
  31
  32     for frame in bt.frames() {
  33         let symbols = frame.symbols();
  34         if symbols.is_empty() {
  35             continue;
  36         }
  37
  38         if let Some(function_name) = symbols[0].name() {
  39             let function_name = function_name.as_str().unwrap();
  40             if function_name.contains("::_234567890_234567890_234567890_234567890_234567890") {
  41                 found_long_name_frame = true;
  42                 assert!(function_name.len() > 200);
  43             }
  44         }
  45     }
  46
  47     assert!(found_long_name_frame);
  48 }