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Add PanicInfo::can_unwind which indicates whether a panic handler is

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allowed to trigger unwinding.
This commit is contained in:
Amanieu d'Antras 2021-12-19 00:43:46 +01:00
parent bd3cb52565
commit 528c4f9158
4 changed files with 31 additions and 10 deletions
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16
library/core/src/panic/panic_info.rs
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@ -31,6 +31,7 @@ pub struct PanicInfo<'a> {
payload: &'a (dyn Any + Send),
message: Option<&'a fmt::Arguments<'a>>,
location: &'a Location<'a>,
can_unwind: bool,
}
impl<'a> PanicInfo<'a> {
@ -44,9 +45,10 @@ impl<'a> PanicInfo<'a> {
pub fn internal_constructor(
message: Option<&'a fmt::Arguments<'a>>,
location: &'a Location<'a>,
can_unwind: bool,
) -> Self {
struct NoPayload;
PanicInfo { location, message, payload: &NoPayload }
PanicInfo { location, message, payload: &NoPayload, can_unwind }
}
#[unstable(
@ -127,6 +129,18 @@ impl<'a> PanicInfo<'a> {
// deal with that case in std::panicking::default_hook and core::panicking::panic_fmt.
Some(&self.location)
}
/// Returns whether the panic handler is allowed to unwind the stack from
/// the point where the panic occurred.
///
/// This is true for most kinds of panics with the exception of panics
/// caused by trying to unwind out of a `Drop` implementation or a function
/// whose ABI does not support unwinding.
#[must_use]
#[unstable(feature = "panic_can_unwind", issue = "92988")]
pub fn can_unwind(&self) -> bool {
self.can_unwind
}
}
#[stable(feature = "panic_hook_display", since = "1.26.0")]