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turn all potential UB into panics

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This commit is contained in:
Jorge Aparicio 2019-02-15 20:23:32 +01:00
parent fe70817653
commit 28ee83dfdd
1 changed files with 8 additions and 30 deletions
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38
src/export.rs
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@ -1,7 +1,5 @@
//! IMPLEMENTATION DETAILS. DO NOT USE ANYTHING IN THIS MODULE
#[cfg(all(not(feature = "nightly"), not(debug_assertions)))]
use core::hint;
#[cfg(not(feature = "nightly"))]
use core::ptr;
use core::{cell::Cell, u8};
@ -98,6 +96,10 @@ pub struct MaybeUninit<T> {
value: Option<T>,
}
#[cfg(not(feature = "nightly"))]
const MSG: &str =
"you have hit a bug (UB) in RTFM implementation; try enabling this crate 'nightly' feature";
#[cfg(not(feature = "nightly"))]
impl<T> MaybeUninit<T> {
pub const fn uninitialized() -> Self {
@ -108,13 +110,7 @@ impl<T> MaybeUninit<T> {
if let Some(x) = self.value.as_ref() {
x
} else {
match () {
// Try to catch UB when compiling in release with debug assertions enabled
#[cfg(debug_assertions)]
() => unreachable!(),
#[cfg(not(debug_assertions))]
() => unsafe { hint::unreachable_unchecked() },
}
unreachable!(MSG)
}
}
@ -122,13 +118,7 @@ impl<T> MaybeUninit<T> {
if let Some(x) = self.value.as_mut() {
x
} else {
match () {
// Try to catch UB when compiling in release with debug assertions enabled
#[cfg(debug_assertions)]
() => unreachable!(),
#[cfg(not(debug_assertions))]
() => unsafe { hint::unreachable_unchecked() },
}
unreachable!(MSG)
}
}
@ -136,13 +126,7 @@ impl<T> MaybeUninit<T> {
if let Some(x) = self.value.as_ref() {
x
} else {
match () {
// Try to catch UB when compiling in release with debug assertions enabled
#[cfg(debug_assertions)]
() => unreachable!(),
#[cfg(not(debug_assertions))]
() => hint::unreachable_unchecked(),
}
unreachable!(MSG)
}
}
@ -150,13 +134,7 @@ impl<T> MaybeUninit<T> {
if let Some(x) = self.value.as_mut() {
x
} else {
match () {
// Try to catch UB when compiling in release with debug assertions enabled
#[cfg(debug_assertions)]
() => unreachable!(),
#[cfg(not(debug_assertions))]
() => hint::unreachable_unchecked(),
}
unreachable!(MSG)
}
}