Since the allocated memory is going to be zeroed immediately anyway,
let's avoid redundantly scrubbing it with MALLOC_SCRUB_BYTE just before
that.
The latest versions of gcc and Clang can automatically do this malloc +
memset -> calloc optimization, but I've seen a couple of places where it
failed to be done.
This commit also adds a naive kcalloc function to the kernel that
doesn't (yet) eliminate the redundancy like the userland does.
Previously, if you forgot to set a key on a SourceGenerator, you would
get this less-than-helpful error message:
> Generate_CSS_MediaFeatureID_cpp:
/home/sam/serenity/Meta/Lagom/../../AK/Optional.h:174: T
AK::Optional<T>::release_value() [with T = AK::String]: Assertion
`m_has_value' failed.
Now, it instead looks like this:
> No key named `name:titlecase` set on SourceGenerator
Generate_CSS_MediaFeatureID_cpp:
/home/sam/serenity/Meta/Lagom/../../AK/SourceGenerator.h:44:
AK::String AK::SourceGenerator::get(AK::StringView) const: Assertion
`false' failed.
This is the IPv6 counter part to the IPv4Address class and implements
parsing strings into a in6_addr and formatting one as a string. It
supports the address compression scheme as well as IPv4 mapped
addresses.
If the utilization of a HashTable (size vs capacity) goes below 20%,
we'll now shrink the table down to capacity = (size * 2).
This fixes an issue where tables would grow infinitely when inserting
and removing keys repeatedly. Basically, we would accumulate deleted
buckets with nothing reclaiming them, and eventually deciding that we
needed to grow the table (because we grow if used+deleted > limit!)
I found this because HashTable iteration was taking a suspicious amount
of time in Core::EventLoop::get_next_timer_expiration(). Turns out the
timer table kept growing in capacity over time. That made iteration
slower and slower since HashTable iterators visit every bucket.
Just walk the table from start to finish, deleting buckets as we go.
This removes the need for remove() to return an iterator, which is
preventing me from implementing hash table auto-shrinking.
This will be caught by new test cases: when the initial chunk is empty,
a dereference before calling operator++ on the iterator will crash as
the initial chunk's size is never checked.
Previously, although we were taking a moved chunk, we still copied it
into our chunk list. This makes DisjointChunk compatible with containers
that don't have a copy constructor but a move constructor.
This adds a NOLINT directive to the definition of the TODO() macro.
clang-tidy wants the assert replaced with a static_assert, since the
macro simply resolves to assert(false). This is obviously nonsensical,
since we want the code to still compile even with TODO().
The same fix has already been implemented for VERIFY_NOT_REACHED().
