diff options
| -rw-r--r-- | library/core/src/lib.rs | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/library/core/src/lib.rs b/library/core/src/lib.rs index 86f5fc56361..dec9a6d991d 100644 --- a/library/core/src/lib.rs +++ b/library/core/src/lib.rs @@ -24,9 +24,8 @@ //! which are generated by Rust codegen backends. Additionally, this library can make explicit //! calls to `strlen`. Their signatures are the same as found in C, but there are extra //! assumptions about their semantics: For `memcpy`, `memmove`, `memset`, `memcmp`, and `bcmp`, if -//! the `n` parameter is 0, the function is assumed to not be UB. Furthermore, for `memcpy`, if -//! source and target pointer are equal, the function is assumed to not be UB. -//! (Note that these are standard assumptions among compilers: +//! the `n` parameter is 0, the function is assumed to not be UB, even if the pointers are NULL or +//! dangling. (Note that making extra assumptions about these functions is common among compilers: //! [clang](https://reviews.llvm.org/D86993) and [GCC](https://gcc.gnu.org/onlinedocs/gcc/Standards.html#C-Language) do the same.) //! These functions are often provided by the system libc, but can also be provided by the //! [compiler-builtins crate](https://crates.io/crates/compiler_builtins). |