1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
#ifndef shared_string_hh_INCLUDED
#define shared_string_hh_INCLUDED
#include "string.hh"
#include "ref_ptr.hh"
#include "utils.hh"
#include "unordered_map.hh"
#include <numeric>
namespace Kakoune
{
struct StringData : UseMemoryDomain<MemoryDomain::SharedString>
{
int refcount;
int length;
StringData(int ref, int len) : refcount(ref), length(len) {}
[[gnu::always_inline]]
char* data() { return reinterpret_cast<char*>(this + 1); }
[[gnu::always_inline]]
const char* data() const { return reinterpret_cast<const char*>(this + 1); }
[[gnu::always_inline]]
StringView strview() const { return {data(), length}; }
struct PtrPolicy
{
static void inc_ref(StringData* r, void*) noexcept { ++r->refcount; }
static void dec_ref(StringData* r, void*) noexcept { if (--r->refcount == 0) destroy(r); }
static void ptr_moved(StringData*, void*, void*) noexcept {}
};
static RefPtr<StringData, PtrPolicy> create(ArrayView<const StringView> strs)
{
const int len = std::accumulate(strs.begin(), strs.end(), 0,
[](int l, StringView s)
{ return l + (int)s.length(); });
void* ptr = StringData::operator new(sizeof(StringData) + len + 1);
auto* res = new (ptr) StringData(0, len);
auto* data = res->data();
for (auto& str : strs)
{
memcpy(data, str.begin(), (size_t)str.length());
data += (int)str.length();
}
res->data()[len] = 0;
return RefPtr<StringData, PtrPolicy>{res};
}
static void destroy(StringData* s)
{
StringData::operator delete(s, sizeof(StringData) + s->length + 1);
}
};
using StringDataPtr = RefPtr<StringData, StringData::PtrPolicy>;
class StringRegistry : public Singleton<StringRegistry>
{
public:
void debug_stats() const;
StringDataPtr intern(StringView str);
void purge_unused();
private:
UnorderedMap<StringView, StringDataPtr, MemoryDomain::SharedString> m_strings;
};
inline StringDataPtr intern(StringView str)
{
return StringRegistry::instance().intern(str);
}
}
#endif // shared_string_hh_INCLUDED
|
