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AK: Add RETURNS_NONNULL attribute and use it

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This attribute tells compilers that the pointer returned by a function
is never null, which lets it optimize away null checks in some places.
This seems like a nice addition to `NonnullOwnPtr` and `NonnullRefPtr`.

Using this attribute causes extra UBSan checks to be emitted. To offset
its performance loss, some additional methods were marked ALWAYS_INLINE,
which lets the compiler optimize duplicate checks
This commit is contained in:
Daniel Bertalan 2021-06-29 15:45:24 +02:00 • committed by Ali Mohammad Pur
parent 65b2d3add3
commit 23d66fe719
3 changed files with 29 additions and 15 deletions
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25
AK/NonnullOwnPtr.h
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@ -98,17 +98,26 @@ public:
return exchange(m_ptr, nullptr);
}
T* ptr() { return m_ptr; }
const T* ptr() const { return m_ptr; }
ALWAYS_INLINE RETURNS_NONNULL T* ptr()
{
VERIFY(m_ptr);
return m_ptr;
}
T* operator->() { return m_ptr; }
const T* operator->() const { return m_ptr; }
ALWAYS_INLINE RETURNS_NONNULL const T* ptr() const
{
VERIFY(m_ptr);
return m_ptr;
}
T& operator*() { return *m_ptr; }
const T& operator*() const { return *m_ptr; }
ALWAYS_INLINE RETURNS_NONNULL T* operator->() { return ptr(); }
ALWAYS_INLINE RETURNS_NONNULL const T* operator->() const { return ptr(); }
operator const T*() const { return m_ptr; }
operator T*() { return m_ptr; }
ALWAYS_INLINE T& operator*() { return *ptr(); }
ALWAYS_INLINE const T& operator*() const { return *ptr(); }
ALWAYS_INLINE RETURNS_NONNULL operator const T*() const { return ptr(); }
ALWAYS_INLINE RETURNS_NONNULL operator T*() { return ptr(); }
operator bool() const = delete;
bool operator!() const = delete;