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AK: Let FlyString::hash() assume that the string was already hashed

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Since the FlyString deduplication mechanism uses a HashTable, we know
that any StringImpl inside a non-null FlyString will already have its
lazily computed hash.
This commit is contained in:
Andreas Kling 2020-04-13 12:05:19 +02:00
parent d1ffdea550
commit 02e0fab19a
2 changed files with 7 additions and 2 deletions
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4
AK/FlyString.h
View file

@ -55,7 +55,7 @@ public:
const char* characters() const { return m_impl ? m_impl->characters() : nullptr; }
size_t length() const { return m_impl ? m_impl->length() : 0; }
u32 hash() const { return m_impl ? m_impl->hash() : 0; }
[[gnu::always_inline]] inline u32 hash() const { return m_impl ? m_impl->existing_hash() : 0; }
StringView view() const;
@ -73,7 +73,7 @@ private:
template<>
struct Traits<FlyString> : public GenericTraits<FlyString> {
static unsigned hash(const FlyString& s) { return s.impl() ? s.impl()->hash() : 0; }
static unsigned hash(const FlyString& s) { return s.hash(); }
};
}

5
AK/StringImpl.h
View file

@ -71,6 +71,11 @@ public:
return m_hash;
}
unsigned existing_hash() const
{
return m_hash;
}
bool is_fly() const { return m_fly; }
void set_fly(Badge<FlyString>, bool fly) const { m_fly = fly; }