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[libc++] Fix bogus integer sanitizer warnings in hash helpers #146715

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[libc++] Fix bogus integer sanitizer warnings in hash helpers #146715

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2 changes: 2 additions & 0 deletions libcxx/include/__config
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Original file line number Diff line number Diff line change
Expand Up @@ -1156,8 +1156,10 @@ typedef __char32_t char32_t;
// Allow for build-time disabling of unsigned integer sanitization
# if __has_attribute(no_sanitize) && !defined(_LIBCPP_COMPILER_GCC)
# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow")))
# define _LIBCPP_DISABLE_UBSAN_INTEGER_CHECK(reason) __attribute__((__no_sanitize__("integer")))
# else
# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
# define _LIBCPP_DISABLE_UBSAN_INTEGER_CHECK(reason)
# endif

# if __has_feature(nullability)
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6 changes: 4 additions & 2 deletions libcxx/include/__functional/hash.h
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Original file line number Diff line number Diff line change
Expand Up @@ -132,11 +132,13 @@ struct __murmur2_or_cityhash<_Size, 64> {
static const _Size __k2 = 0x9ae16a3b2f90404fULL;
static const _Size __k3 = 0xc949d7c7509e6557ULL;

_LIBCPP_HIDE_FROM_ABI static _Size __rotate(_Size __val, int __shift) {
_LIBCPP_HIDE_FROM_ABI static _Size _LIBCPP_DISABLE_UBSAN_INTEGER_CHECK("shifting can cause unsigned overflow")
__rotate(_Size __val, int __shift) {
return __shift == 0 ? __val : ((__val >> __shift) | (__val << (64 - __shift)));
}

_LIBCPP_HIDE_FROM_ABI static _Size __rotate_by_at_least_1(_Size __val, int __shift) {
_LIBCPP_HIDE_FROM_ABI static _Size _LIBCPP_DISABLE_UBSAN_INTEGER_CHECK("shifting can cause unsigned overflow")
__rotate_by_at_least_1(_Size __val, int __shift) {
return (__val >> __shift) | (__val << (64 - __shift));
}

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