//! Debug tracing helpers.

use core::fmt;

/// Prefix added to the log file names, just before the thread name or id.

pub static LOG_FILENAME_PREFIX: &str = "cranelift.dbg.";

/// Helper for printing lists.

pub struct DisplayList<'a, T>(pub &'a [T])

where

    T: 'a + fmt::Display;

impl<'a, T> fmt::Display for DisplayList<'a, T>

where

    T: 'a + fmt::Display,

{

    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {

        match self.0.split_first() {

            None => write!(f, "[]"),

            Some((first, rest)) => {

                write!(f, "[{}", first)?;

                for x in rest {

                    write!(f, ", {}", x)?;

                }

                write!(f, "]")

            }

        }

    }

}