125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
#ifndef shared_string_hh_INCLUDED
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#define shared_string_hh_INCLUDED
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#include "string.hh"
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#include "ref_ptr.hh"
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#include "utils.hh"
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#include "unordered_map.hh"
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namespace Kakoune
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{
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struct StringData : UseMemoryDomain<MemoryDomain::SharedString>
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{
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int refcount;
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int length;
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uint32_t hash;
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StringData(int ref, int len) : refcount(ref), length(len) {}
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[[gnu::always_inline]]
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char* data() { return reinterpret_cast<char*>(this + 1); }
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[[gnu::always_inline]]
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const char* data() const { return reinterpret_cast<const char*>(this + 1); }
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[[gnu::always_inline]]
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StringView strview() const { return {data(), length}; }
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static RefPtr<StringData> create(StringView str, char back = 0)
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{
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const int len = (int)str.length() + (back != 0 ? 1 : 0);
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void* ptr = StringData::operator new(sizeof(StringData) + len + 1);
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StringData* res = new (ptr) StringData(0, len);
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std::copy(str.begin(), str.end(), res->data());
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if (back != 0)
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res->data()[len-1] = back;
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res->data()[len] = 0;
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res->hash = hash_data(res->data(), res->length);
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return RefPtr<StringData>(res);
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}
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static void destroy(StringData* s)
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{
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StringData::operator delete(s, sizeof(StringData) + s->length + 1);
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}
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friend void inc_ref_count(StringData* s, void*)
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{
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++s->refcount;
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}
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friend void dec_ref_count(StringData* s, void*)
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{
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if (--s->refcount == 0)
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StringData::destroy(s);
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}
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};
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using StringDataPtr = RefPtr<StringData>;
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inline StringDataPtr operator"" _ss(const char* ptr, size_t len)
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{
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return StringData::create({ptr, (int)len});
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}
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class SharedString : public StringView
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{
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public:
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SharedString() = default;
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SharedString(StringView str)
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{
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if (not str.empty())
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{
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m_storage = StringData::create(str);
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StringView::operator=(m_storage->strview());
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}
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}
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struct NoCopy{};
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SharedString(StringView str, NoCopy) : StringView(str) {}
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SharedString(const char* str) : SharedString(StringView{str}) {}
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SharedString acquire_substr(ByteCount from, ByteCount length = INT_MAX) const
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{
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return SharedString{StringView::substr(from, length), m_storage};
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}
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SharedString acquire_substr(CharCount from, CharCount length = INT_MAX) const
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{
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return SharedString{StringView::substr(from, length), m_storage};
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}
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explicit SharedString(StringDataPtr storage)
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: StringView{storage->strview()}, m_storage(std::move(storage)) {}
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friend size_t hash_value(const SharedString& str)
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{
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return str.m_storage ? str.m_storage->hash : hash_data(str.data(), (int)str.length());
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}
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private:
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SharedString(StringView str, StringDataPtr storage)
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: StringView{str}, m_storage(std::move(storage)) {}
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friend class StringRegistry;
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StringDataPtr m_storage;
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};
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class StringRegistry : public Singleton<StringRegistry>
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{
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public:
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void debug_stats() const;
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SharedString intern(StringView str);
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void purge_unused();
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private:
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UnorderedSet<SharedString, MemoryDomain::SharedString> m_strings;
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};
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inline SharedString intern(StringView str)
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{
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return StringRegistry::instance().intern(str);
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}
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}
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#endif // shared_string_hh_INCLUDED
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