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Print the precondition we violated, and visible through output capture

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Co-authored-by: Ralf Jung <post@ralfj.de>
This commit is contained in:
Ben Kimock
2022-10-13 23:01:58 -04:00
parent 629a414d7b
commit 458aaa5a23
12 changed files with 138 additions and 36 deletions
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12
library/core/src/slice/raw.rs
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@@ -92,8 +92,10 @@ use crate::ptr;
pub const unsafe fn from_raw_parts<'a, T>(data: *const T, len: usize) -> &'a [T] {
// SAFETY: the caller must uphold the safety contract for `from_raw_parts`.
unsafe {
assert_unsafe_precondition!([T](data: *const T, len: usize) =>
is_aligned_and_not_null(data) && is_valid_allocation_size::<T>(len)
assert_unsafe_precondition!(
"slice::from_raw_parts requires the pointer to be aligned and non-null, and the total size of the slice not to exceed `isize::MAX`",
[T](data: *const T, len: usize) => is_aligned_and_not_null(data)
&& is_valid_allocation_size::<T>(len)
);
&*ptr::slice_from_raw_parts(data, len)
}
@@ -135,8 +137,10 @@ pub const unsafe fn from_raw_parts<'a, T>(data: *const T, len: usize) -> &'a [T]
pub const unsafe fn from_raw_parts_mut<'a, T>(data: *mut T, len: usize) -> &'a mut [T] {
// SAFETY: the caller must uphold the safety contract for `from_raw_parts_mut`.
unsafe {
assert_unsafe_precondition!([T](data: *mut T, len: usize) =>
is_aligned_and_not_null(data) && is_valid_allocation_size::<T>(len)
assert_unsafe_precondition!(
"slice::from_raw_parts_mut requires the pointer to be aligned and non-null, and the total size of the slice not to exceed `isize::MAX`",
[T](data: *mut T, len: usize) => is_aligned_and_not_null(data)
&& is_valid_allocation_size::<T>(len)
);
&mut *ptr::slice_from_raw_parts_mut(data, len)
}