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/*
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2020 Gothel Software e.K.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef COUNTING_ALLOCATOR_HPP
#define COUNTING_ALLOCATOR_HPP
#include <cinttypes>
#include <memory>
#include <jau/basic_types.hpp>
// #include <jau/ordered_atomic.hpp>
namespace jau {
/**
* Performance counter std::allocator specialization.
* <p>
* This class shall be compliant with <i>C++ named requirements for Allocator</i>.
* </p>
* <p>
* Not overriding deprecated (C++17) and removed (C++20)
* methods: address(), max_size(), construct() and destroy().
* </p>
*/
template <class T>
struct counting_allocator : public std::allocator<T>
{
public:
template <class U> struct rebind {typedef counting_allocator<U> other;};
// typedefs' for C++ named requirements: Allocator
typedef T value_type;
// std::size_t id;
bool old_stats;
std::size_t memory_usage;
std::size_t alloc_count;
std::size_t dealloc_count;
ssize_t alloc_balance;
private:
// inline static relaxed_atomic_size_t next_id = 1;
/**
* vector<value_type>::get_allocator() returns a copy of the allocator instance,
* where we desire to access the copied statistics.
* <p>
* However, vector<value_type>(const vector<value_type>&) also copies the allocator instance,
* but here the copied statistics shall be flushed since the elements are
* copied into the new vector<value_type> instance using the new allocator.<br>
* Without flushing the stats, we would see a size + size allocator stats,
* the former size from the copied allocator and the latter from the
* copied elements into the new vector<value_type> instance.
* </p>
*/
constexpr void flush_stats() noexcept {
if( old_stats ) {
old_stats = false;
memory_usage = 0;
alloc_count = 0;
dealloc_count = 0;
alloc_balance = 0;
}
}
public:
std::string toString(const nsize_t mem_width=0, const nsize_t count_width=0) {
return "CAlloc["/*+std::to_string(id)+", "*/+to_decstring(memory_usage, ',', mem_width)+" bytes, alloc[balance "+
to_decstring(alloc_balance, ',', count_width)+" = "+
to_decstring(alloc_count, ',', count_width)+" - "+to_decstring(dealloc_count, ',', count_width)+"]]";
}
counting_allocator() noexcept
: std::allocator<value_type>(),
// id(next_id++),
old_stats(false),
memory_usage(0), alloc_count(0), dealloc_count(0), alloc_balance(0)
{ } // C++11
#if __cplusplus > 201703L
constexpr counting_allocator(const counting_allocator& other) noexcept
: std::allocator<value_type>(other),
// id(next_id++),
old_stats(true),
memory_usage(other.memory_usage),
alloc_count(other.alloc_count), dealloc_count(other.dealloc_count),
alloc_balance(other.alloc_balance)
{} // C++20
#else
counting_allocator(const counting_allocator& other) noexcept
: std::allocator<value_type>(other),
// id(next_id++),
old_stats(true),
memory_usage(other.memory_usage),
alloc_count(other.alloc_count), dealloc_count(other.dealloc_count),
alloc_balance(other.alloc_balance)
{ }
#endif
#if __cplusplus > 201703L
template <typename U>
constexpr counting_allocator(const counting_allocator<U>& other) noexcept
: std::allocator<value_type>(other),
// id(next_id++),
old_stats(true),
memory_usage(other.memory_usage),
alloc_count(other.alloc_count), dealloc_count(other.dealloc_count),
alloc_balance(other.alloc_balance)
{} // C++20
#else
template <typename U>
counting_allocator(const counting_allocator<U>& other) noexcept
: std::allocator<value_type>(other),
// id(next_id++),
old_stats(true),
memory_usage(other.memory_usage),
alloc_count(other.alloc_count), dealloc_count(other.dealloc_count),
alloc_balance(other.alloc_balance)
{ }
#endif
#if __cplusplus > 201703L
constexpr ~counting_allocator() {} // C++20
#else
~counting_allocator() = default;
#endif
#if __cplusplus <= 201703L
value_type* allocate(std::size_t n, const void * hint) { // C++17 deprecated; C++20 removed
flush_stats();
memory_usage += n * sizeof(value_type);
alloc_count++;
alloc_balance++;
return std::allocator<value_type>::allocate(n, hint);
}
#endif
#if __cplusplus > 201703L
[[nodiscard]] constexpr value_type* allocate(std::size_t n) { // C++20
flush_stats();
memory_usage += n * sizeof(value_type);
alloc_count++;
alloc_balance++;
return std::allocator<value_type>::allocate(n);
}
#else
value_type* allocate(std::size_t n) { // C++17
flush_stats();
memory_usage += n * sizeof(value_type);
alloc_count++;
alloc_balance++;
return std::allocator<value_type>::allocate(n);
}
#endif
#if __cplusplus > 201703L
constexpr void deallocate(value_type* p, std::size_t n ) {
flush_stats();
memory_usage -= n * sizeof(value_type);
dealloc_count++;
alloc_balance--;
std::allocator<value_type>::deallocate(p, n);
}
#else
void deallocate(value_type* p, std::size_t n ) {
flush_stats();
memory_usage -= n * sizeof(value_type);
dealloc_count++;
alloc_balance--;
std::allocator<value_type>::deallocate(p, n);
}
#endif
};
#if __cplusplus > 201703L
template <class T1, class T2>
constexpr bool operator==(const counting_allocator<T1>& lhs, const counting_allocator<T2>& rhs) noexcept {
#if 0
if( &lhs == &rhs ) {
return true;
}
return lhs.memory_usage == rhs.memory_usage;
#else
(void)lhs;
(void)rhs;
return true;
#endif
}
#else
template <class T1, class T2>
bool operator==(const counting_allocator<T1>& lhs, const counting_allocator<T2>& rhs) noexcept {
#if 0
if( &lhs == &rhs ) {
return true;
}
return lhs.memory_usage == rhs.memory_usage;
#else
(void)lhs;
(void)rhs;
return true;
#endif
}
template <class T1, class T2>
bool operator!=(const counting_allocator<T1>& lhs, const counting_allocator<T2>& rhs) noexcept {
return !(lhs==rhs);
}
#endif
} /* namespace jau */
#endif // COUNTING_ALLOCATOR_HPP
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