kakoune/src/memory.hh

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#ifndef memory_hh_INCLUDED
#define memory_hh_INCLUDED
#include <cstddef>
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#include <new>
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#include <utility>
#include "assert.hh"
namespace Kakoune
{
enum class MemoryDomain
{
Undefined,
String,
SharedString,
BufferContent,
BufferMeta,
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Options,
Highlight,
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Display,
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Mapping,
Commands,
Hooks,
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Aliases,
EnvVars,
Faces,
Values,
Registers,
Client,
WordDB,
Selections,
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History,
Count
};
inline const char* domain_name(MemoryDomain domain)
{
switch (domain)
{
case MemoryDomain::Undefined: return "Undefined";
case MemoryDomain::String: return "String";
case MemoryDomain::SharedString: return "SharedString";
case MemoryDomain::BufferContent: return "BufferContent";
case MemoryDomain::BufferMeta: return "BufferMeta";
case MemoryDomain::Options: return "Options";
case MemoryDomain::Highlight: return "Highlight";
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case MemoryDomain::Display: return "Display";
case MemoryDomain::Mapping: return "Mapping";
case MemoryDomain::Commands: return "Commands";
case MemoryDomain::Hooks: return "Hooks";
case MemoryDomain::WordDB: return "WordDB";
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case MemoryDomain::Aliases: return "Aliases";
case MemoryDomain::EnvVars: return "EnvVars";
case MemoryDomain::Faces: return "Faces";
case MemoryDomain::Values: return "Values";
case MemoryDomain::Registers: return "Registers";
case MemoryDomain::Client: return "Client";
case MemoryDomain::Selections: return "Selections";
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case MemoryDomain::History: return "History";
case MemoryDomain::Count: break;
}
kak_assert(false);
return "";
}
extern size_t domain_allocated_bytes[(size_t)MemoryDomain::Count];
inline void on_alloc(MemoryDomain domain, size_t size)
{
domain_allocated_bytes[(int)domain] += size;
}
inline void on_dealloc(MemoryDomain domain, size_t size)
{
kak_assert(domain_allocated_bytes[(int)domain] >= size);
domain_allocated_bytes[(int)domain] -= size;
}
template<typename T, MemoryDomain domain>
struct Allocator
{
using value_type = T;
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// TODO: remove that once we have a c++11 compliant stdlib
using pointer = T*;
using const_pointer = const T*;
using reference = T&;
using const_reference = const T&;
using size_type = std::size_t;
using difference_type = std::ptrdiff_t;
Allocator() = default;
template<typename U>
Allocator(const Allocator<U, domain>&) {}
template<typename U>
struct rebind { using other = Allocator<U, domain>; };
T* allocate(size_t n)
{
size_t size = sizeof(T) * n;
on_alloc(domain, size);
return reinterpret_cast<T*>(::operator new(size));
}
void deallocate(T* ptr, size_t n)
{
size_t size = sizeof(T) * n;
on_dealloc(domain, size);
::operator delete(ptr);
}
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template<class U, class... Args>
[[gnu::always_inline]]
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void construct(U* p, Args&&... args)
{
new ((void*)p) U(std::forward<Args>(args)...);
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}
template<class U>
[[gnu::always_inline]]
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void destroy(U* p) { p->~U(); }
};
template<typename T1, MemoryDomain d1, typename T2, MemoryDomain d2>
bool operator==(const Allocator<T1, d1>& lhs, const Allocator<T2, d2>& rhs)
{
return d1 == d2;
}
template<typename T1, MemoryDomain d1, typename T2, MemoryDomain d2>
bool operator!=(const Allocator<T1, d1>& lhs, const Allocator<T2, d2>& rhs)
{
return d1 != d2;
}
template<typename T>
struct TypeDomain
{
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static constexpr MemoryDomain domain() { return TypeDomain<T>::helper((T*)nullptr); }
private:
template<typename U> static decltype(U::Domain) constexpr helper(U*) { return U::Domain; }
static constexpr MemoryDomain helper(...) { return MemoryDomain::Undefined; }
};
template<MemoryDomain d>
struct UseMemoryDomain
{
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static constexpr MemoryDomain Domain = d;
static void* operator new(size_t size)
{
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on_alloc(Domain, size);
return ::operator new(size);
}
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static void* operator new(size_t size, void* ptr)
{
return ::operator new(size, ptr);
}
static void operator delete(void* ptr, size_t size)
{
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on_dealloc(Domain, size);
::operator delete(ptr);
}
};
}
#endif // memory_hh_INCLUDED