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AK: Add workaround for faulty Sanitizer warning on gcc 13+ in Atomic

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gcc can't seem to figure out that the address of a member variable of
AK::Atomic<u32> in AtomicRefCounted cannot be null when fetch_sub-ing.
Add a bogus condition to convince the compiler that it can't be null.
This commit is contained in:
Andrew Kaster 2024-04-22 20:17:37 -06:00 committed by Andrew Kaster
parent 1c3f11a5a6
commit 913cffe928
1 changed files with 7 additions and 1 deletions
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8
AK/Atomic.h
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@ -279,7 +279,13 @@ public:
ALWAYS_INLINE T fetch_sub(T val, MemoryOrder order = DefaultMemoryOrder) volatile noexcept
{
return __atomic_fetch_sub(&m_value, val, order);
T volatile* ptr = &m_value;
// FIXME: GCC > 12 will wrongly warn on -Wstringop-overflow here with ASAN+UBSAN
#if defined(AK_COMPILER_GCC) && defined(HAS_ADDRESS_SANITIZER)
if (!ptr)
__builtin_unreachable();
#endif
return __atomic_fetch_sub(ptr, val, order);
}
ALWAYS_INLINE T operator&=(T val) volatile noexcept