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We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace!
This was a slightly tedious refactoring that took a long time, so it's
not unlikely that some bugs crept in.
Nevertheless, it does pass basic functionality testing, and it's just
real nice to finally see the same pattern in all contexts. :^)
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When a process with a large heap crashes (e.g WebContent), it gets very
cumbersome to dump out a huge amount of memory.
In the vast majority of cases, we're only interested in generating a
nice backtrace from the coredump, so let's have the kernel skip over
userspace heap regions when dumping memory for now.
This is not ideal, and almost a little bit ugly, but it does make
investigating 500 MiB WebContent crashes significantly easier for now.
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Dr. POSIX really calls these "open file description", not just
"file description", so let's call them exactly that. :^)
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Both KResult and KResultOr are [[nodiscard]] at the class level,
so there's no need to have functions return `[[nodiscard]] KResult`.
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Instead of creating a bunch of ByteBuffers and concatenating them to
generate the "notes" segment, we now simply create a KBufferBuilder
and tell each of the notes generator helpers to write into the builder.
This allows the code to flow more naturally, with some bonus additional
error propagation. :^)
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- Use KResultOr and TRY to propagate errors
- Return more specific errors now that they have a path out from here
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If we can easily communicate failure, let's avoid asserting and report
failure instead.
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We all know what a coredump is, and it feels more natural to refer to
it as a coredump (most code already does), so let's be consistent.
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