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This allows us to take advantage of the now-optimized (to do memmove())
Vector::append(const T*, int count) for collecting these strings.
This is a ~15% speedup on the load_4chan_catalog benchmark.
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It wasn't unsed anywhere else anyway, and this is actually ~1% faster
on the load_4chan_catalog benchmark.
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Keep a 256-entry string cache during parse to avoid creating some new
strings when possible. This cache is far from perfect but very cheap.
Since none of the strings are transient, this only costs us a couple of
pointers and a bit of ref-count manipulation.
The cache hit rate on 4chan_catalog.json is ~33% and the speedup on
the load_4chan_catalog benchmark is ~7%.
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- Return more specific types from parse_array() and parse_object().
- Don't create a throwaway String in extract_while().
- Use a StringView in parse_number() to avoid a throwaway String.
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This is a 10-12% speedup on the 4chan thread catalog JSON.
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This dodges a whole bunch of value copying in JsonParser.
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Update ProcessManager, top and WSCPUMonitor to handle the new format.
Since the kernel is not allowed to use floating-point math, we now compile
the JSON classes in AK without JsonValue::Type::Double support.
To accomodate large unsigned ints, I added a JsonValue::Type::UnsignedInt.
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I didn't implement \uXXXX-style escape in this patch. That's a FIXME.
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