1 //! Debug tracing helpers.
2 use core::fmt;
3 
4 /// Prefix added to the log file names, just before the thread name or id.
5 pub static LOG_FILENAME_PREFIX: &str = "cranelift.dbg.";
6 
7 /// Helper for printing lists.
8 pub struct DisplayList<'a, T>(pub &'a [T])
9 where
10     T: 'a + fmt::Display;
11 
12 impl<'a, T> fmt::Display for DisplayList<'a, T>
13 where
14     T: 'a + fmt::Display,
15 {
fmt(&self, f: &mut fmt::Formatter) -> fmt::Result16     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
17         match self.0.split_first() {
18             None => write!(f, "[]"),
19             Some((first, rest)) => {
20                 write!(f, "[{}", first)?;
21                 for x in rest {
22                     write!(f, ", {}", x)?;
23                 }
24                 write!(f, "]")
25             }
26         }
27     }
28 }
29