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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "buffer_type.h"
#include "aligner.h"
#include "array_store_config.h"
#include <algorithm>
#include <memory>
#include <type_traits>
namespace vespalib::datastore {
/**
* Concrete class used to manage allocation and de-allocation of
* elements of type ElemType in data store buffers.
*
* Layout of each entry is:
*
* elements[array_size] - array of elements in entry
* padding - to align entries
* dynamic_array_size - number of array elements that should
* be visible to reader.
*/
template <typename ElemT>
class DynamicArrayBufferType : public BufferTypeBase
{
using AllocSpec = ArrayStoreConfig::AllocSpec;
std::shared_ptr<alloc::MemoryAllocator> _memory_allocator;
public:
using ElemType = ElemT;
static constexpr size_t entry_min_align = std::max(alignof(uint32_t), alignof(ElemT));
using EntryMinAligner = Aligner<entry_min_align>;
static constexpr uint32_t dynamic_array_buffer_underflow_size = 64u;
static constexpr bool align_for_simd = std::disjunction_v<std::is_same<ElemT, double>,std::is_same<ElemT, float>, std::is_same<ElemT, int64_t>, std::is_same<ElemT, int32_t>>;
protected:
static const ElemType& empty_entry() noexcept;
ElemType* get_entry(void *buffer, size_t offset) noexcept { return get_entry(buffer, offset, entry_size()); }
const ElemType* get_entry(const void *buffer, size_t offset) const noexcept { return get_entry(buffer, offset, entry_size()); }
public:
DynamicArrayBufferType(const DynamicArrayBufferType &rhs) = delete;
DynamicArrayBufferType & operator=(const DynamicArrayBufferType &rhs) = delete;
DynamicArrayBufferType(DynamicArrayBufferType&& rhs) noexcept;
DynamicArrayBufferType & operator=(DynamicArrayBufferType && rhs) noexcept = default;
DynamicArrayBufferType(uint32_t array_size, const AllocSpec& spec, std::shared_ptr<alloc::MemoryAllocator> memory_allocator) noexcept;
template <typename TypeMapper>
DynamicArrayBufferType(uint32_t array_size, const AllocSpec& spec, std::shared_ptr<alloc::MemoryAllocator> memory_allocator, TypeMapper&) noexcept
: DynamicArrayBufferType(array_size, spec, std::move(memory_allocator))
{
}
~DynamicArrayBufferType() override;
void destroy_entries(void* buffer, EntryCount num_entries) override;
void fallback_copy(void* new_buffer, const void* old_buffer, EntryCount num_entries) override;
void initialize_reserved_entries(void* buffer, EntryCount reserved_entries) override;
void clean_hold(void* buffer, size_t offset, EntryCount num_entries, CleanContext cleanCxt) override;
const vespalib::alloc::MemoryAllocator* get_memory_allocator() const override;
static size_t calc_entry_size(size_t array_size) noexcept;
static size_t calc_array_size(size_t entry_size) noexcept;
static ElemType* get_entry(void* buffer, size_t offset, uint32_t entry_size) noexcept { return reinterpret_cast<ElemType*>(static_cast<char*>(buffer) + offset * entry_size); }
static const ElemType* get_entry(const void* buffer, size_t offset, uint32_t entry_size) noexcept { return reinterpret_cast<const ElemType*>(static_cast<const char*>(buffer) + offset * entry_size); }
static uint32_t get_dynamic_array_size(const ElemType* buffer) noexcept { return *(reinterpret_cast<const uint32_t*>(buffer) - 1); }
static void set_dynamic_array_size(ElemType* buffer, uint32_t array_size) noexcept { *(reinterpret_cast<uint32_t*>(buffer) - 1) = array_size; }
bool is_dynamic_array_buffer_type() const noexcept override;
};
extern template class DynamicArrayBufferType<char>;
extern template class DynamicArrayBufferType<int8_t>;
extern template class DynamicArrayBufferType<int16_t>;
extern template class DynamicArrayBufferType<int32_t>;
extern template class DynamicArrayBufferType<int64_t>;
extern template class DynamicArrayBufferType<float>;
extern template class DynamicArrayBufferType<double>;
extern template class DynamicArrayBufferType<AtomicEntryRef>;
}
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