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Add separate impl of unwrap_failed to avoid constructing trait objects

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This commit is contained in:
Manish Goregaokar 2021-12-10 13:12:26 +05:30
parent 0adee2c01e
commit 917dafc73a
1 changed files with 13 additions and 0 deletions
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13
library/core/src/result.rs
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@ -1653,6 +1653,7 @@ impl<T> Result<T, T> {
}
// This is a separate function to reduce the code size of the methods
#[cfg(not(feature = "panic_immediate_abort"))]
#[inline(never)]
#[cold]
#[track_caller]
@ -1660,6 +1661,18 @@ fn unwrap_failed(msg: &str, error: &dyn fmt::Debug) -> ! {
panic!("{}: {:?}", msg, error)
}
// This is a separate function to avoid constructing a `dyn Debug`
// that gets immediately thrown away, since vtables don't get cleaned up
// by dead code elimination if a trait object is constructed even if it goes
// unused
#[cfg(feature = "panic_immediate_abort")]
#[inline]
#[cold]
#[track_caller]
fn unwrap_failed<T>(_msg: &str, _error: &T) -> ! {
panic!()
}
/////////////////////////////////////////////////////////////////////////////
// Trait implementations
/////////////////////////////////////////////////////////////////////////////