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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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5
AK/Platform.h
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@ -40,6 +40,11 @@
#endif
#define FLATTEN __attribute__((flatten))
#ifdef RETURNS_NONNULL
# undef RETURNS_NONNULL
#endif
#define RETURNS_NONNULL __attribute__((returns_nonnull))
#ifdef NO_SANITIZE_ADDRESS
# undef NO_SANITIZE_ADDRESS
#endif