/rust/registry/src/index.crates.io-6f17d22bba15001f/memchr-2.7.4/src/ext.rs
Line | Count | Source (jump to first uncovered line) |
1 | | /// A trait for adding some helper routines to pointers. |
2 | | pub(crate) trait Pointer { |
3 | | /// Returns the distance, in units of `T`, between `self` and `origin`. |
4 | | /// |
5 | | /// # Safety |
6 | | /// |
7 | | /// Same as `ptr::offset_from` in addition to `self >= origin`. |
8 | | unsafe fn distance(self, origin: Self) -> usize; |
9 | | |
10 | | /// Casts this pointer to `usize`. |
11 | | /// |
12 | | /// Callers should not convert the `usize` back to a pointer if at all |
13 | | /// possible. (And if you believe it's necessary, open an issue to discuss |
14 | | /// why. Otherwise, it has the potential to violate pointer provenance.) |
15 | | /// The purpose of this function is just to be able to do arithmetic, i.e., |
16 | | /// computing offsets or alignments. |
17 | | fn as_usize(self) -> usize; |
18 | | } |
19 | | |
20 | | impl<T> Pointer for *const T { |
21 | 2.68M | unsafe fn distance(self, origin: *const T) -> usize { |
22 | 2.68M | // TODO: Replace with `ptr::sub_ptr` once stabilized. |
23 | 2.68M | usize::try_from(self.offset_from(origin)).unwrap_unchecked() |
24 | 2.68M | } Unexecuted instantiation: <*const u8 as memchr::ext::Pointer>::distance <*const u8 as memchr::ext::Pointer>::distance Line | Count | Source | 21 | 895k | unsafe fn distance(self, origin: *const T) -> usize { | 22 | 895k | // TODO: Replace with `ptr::sub_ptr` once stabilized. | 23 | 895k | usize::try_from(self.offset_from(origin)).unwrap_unchecked() | 24 | 895k | } |
Unexecuted instantiation: <*const u8 as memchr::ext::Pointer>::distance Unexecuted instantiation: <*const u8 as memchr::ext::Pointer>::distance <*const u8 as memchr::ext::Pointer>::distance Line | Count | Source | 21 | 1.78M | unsafe fn distance(self, origin: *const T) -> usize { | 22 | 1.78M | // TODO: Replace with `ptr::sub_ptr` once stabilized. | 23 | 1.78M | usize::try_from(self.offset_from(origin)).unwrap_unchecked() | 24 | 1.78M | } |
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25 | | |
26 | 0 | fn as_usize(self) -> usize { |
27 | 0 | self as usize |
28 | 0 | } |
29 | | } |
30 | | |
31 | | impl<T> Pointer for *mut T { |
32 | 0 | unsafe fn distance(self, origin: *mut T) -> usize { |
33 | 0 | (self as *const T).distance(origin as *const T) |
34 | 0 | } |
35 | | |
36 | 0 | fn as_usize(self) -> usize { |
37 | 0 | (self as *const T).as_usize() |
38 | 0 | } |
39 | | } |
40 | | |
41 | | /// A trait for adding some helper routines to raw bytes. |
42 | | #[cfg(test)] |
43 | | pub(crate) trait Byte { |
44 | | /// Converts this byte to a `char` if it's ASCII. Otherwise panics. |
45 | | fn to_char(self) -> char; |
46 | | } |
47 | | |
48 | | #[cfg(test)] |
49 | | impl Byte for u8 { |
50 | | fn to_char(self) -> char { |
51 | | assert!(self.is_ascii()); |
52 | | char::from(self) |
53 | | } |
54 | | } |