vendor/backtrace-0.3.3/tests/long_fn_name.rs

   1 extern crate backtrace;
   2
   3 #[cfg(all(windows, feature = "dbghelp"))]
   4 extern crate winapi;
   5
   6 use backtrace::Backtrace;
   7
   8 // 50-character module name
   9 mod _234567890_234567890_234567890_234567890_234567890 {
  10     // 50-character struct name
  11     #[allow(non_camel_case_types)]
  12     pub struct _234567890_234567890_234567890_234567890_234567890<T>(T);
  13     impl<T> _234567890_234567890_234567890_234567890_234567890<T> {
  14         #[allow(dead_code)]
  15         pub fn new() -> ::Backtrace {
  16             ::Backtrace::new()
  17         }
  18     }
  19 }
  20
  21 // Long function names must be truncated to (MAX_SYM_NAME - 1) characters.
  22 // Only run this test for msvc, since gnu prints "<no info>" for all frames.
  23 #[test]
  24 #[cfg(all(windows, feature = "dbghelp", target_env = "msvc"))]
  25 fn test_long_fn_name() {
  26     use _234567890_234567890_234567890_234567890_234567890::
  27         _234567890_234567890_234567890_234567890_234567890 as S;
  28
  29     // 10 repetitions of struct name, so fully qualified function name is
  30     // atleast 10 * (50 + 50) * 2 = 2000 characters long.
  31     // It's actually longer since it also includes `::`, `<>` and the
  32     // name of the current module
  33     let bt = S::<S<S<S<S<S<S<S<S<S<i32>>>>>>>>>>::new();
  34     println!("{:?}", bt);
  35
  36     let mut found_long_name_frame = false;
  37
  38     for frame in bt.frames() {
  39         let symbols = frame.symbols();
  40         if symbols.is_empty() {
  41             continue;
  42         }
  43
  44         if let Some(function_name) = symbols[0].name() {
  45             let function_name = function_name.as_str().unwrap();
  46             if function_name.contains(
  47                 "::_234567890_234567890_234567890_234567890_234567890")
  48             {
  49                 found_long_name_frame = true;
  50                 assert_eq!(function_name.len(), winapi::MAX_SYM_NAME - 1);
  51             }
  52         }
  53     }
  54
  55     assert!(found_long_name_frame);
  56 }