79 lines
2.2 KiB
C++
79 lines
2.2 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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#include <numeric>
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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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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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struct PtrPolicy
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{
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static void inc_ref(StringData* r, void*) noexcept { ++r->refcount; }
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static void dec_ref(StringData* r, void*) noexcept { if (--r->refcount == 0) destroy(r); }
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static void ptr_moved(StringData*, void*, void*) noexcept {}
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};
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static RefPtr<StringData, PtrPolicy> create(ArrayView<const StringView> strs)
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{
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const int len = std::accumulate(strs.begin(), strs.end(), 0,
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[](int l, StringView s)
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{ return l + (int)s.length(); });
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void* ptr = StringData::operator new(sizeof(StringData) + len + 1);
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auto* res = new (ptr) StringData(0, len);
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auto* data = res->data();
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for (auto& str : strs)
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{
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memcpy(data, str.begin(), (size_t)str.length());
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data += (int)str.length();
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}
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res->data()[len] = 0;
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return RefPtr<StringData, PtrPolicy>{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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};
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using StringDataPtr = RefPtr<StringData, StringData::PtrPolicy>;
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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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StringDataPtr intern(StringView str);
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void purge_unused();
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private:
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UnorderedMap<StringView, StringDataPtr, MemoryDomain::SharedString> m_strings;
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};
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inline StringDataPtr 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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