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// Copyright (c) 2015 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_MEMUSAGE_H
#define BITCOIN_MEMUSAGE_H
#include <stdlib.h>
#include <map>
#include <set>
#include <vector>
#include <boost/unordered_set.hpp>
#include <boost/unordered_map.hpp>
namespace memusage
{
/** Compute the total memory used by allocating alloc bytes. */
static size_t MallocUsage(size_t alloc);
/** Compute the memory used for dynamically allocated but owned data structures.
* For generic data types, this is *not* recursive. DynamicUsage(vector<vector<int> >)
* will compute the memory used for the vector<int>'s, but not for the ints inside.
* This is for efficiency reasons, as these functions are intended to be fast. If
* application data structures require more accurate inner accounting, they should
* do the recursion themselves, or use more efficient caching + updating on modification.
*/
template<typename X> static size_t DynamicUsage(const std::vector<X>& v);
template<typename X> static size_t DynamicUsage(const std::set<X>& s);
template<typename X, typename Y> static size_t DynamicUsage(const std::map<X, Y>& m);
template<typename X, typename Y> static size_t DynamicUsage(const boost::unordered_set<X, Y>& s);
template<typename X, typename Y, typename Z> static size_t DynamicUsage(const boost::unordered_map<X, Y, Z>& s);
template<typename X> static size_t DynamicUsage(const X& x);
static inline size_t MallocUsage(size_t alloc)
{
// Measured on libc6 2.19 on Linux.
if (sizeof(void*) == 8) {
return ((alloc + 31) >> 4) << 4;
} else if (sizeof(void*) == 4) {
return ((alloc + 15) >> 3) << 3;
} else {
assert(0);
}
}
// STL data structures
template<typename X>
struct stl_tree_node
{
private:
int color;
void* parent;
void* left;
void* right;
X x;
};
template<typename X>
static inline size_t DynamicUsage(const std::vector<X>& v)
{
return MallocUsage(v.capacity() * sizeof(X));
}
template<typename X>
static inline size_t DynamicUsage(const std::set<X>& s)
{
return MallocUsage(sizeof(stl_tree_node<X>)) * s.size();
}
template<typename X, typename Y>
static inline size_t DynamicUsage(const std::map<X, Y>& m)
{
return MallocUsage(sizeof(stl_tree_node<std::pair<const X, Y> >)) * m.size();
}
// Boost data structures
template<typename X>
struct boost_unordered_node : private X
{
private:
void* ptr;
};
template<typename X, typename Y>
static inline size_t DynamicUsage(const boost::unordered_set<X, Y>& s)
{
return MallocUsage(sizeof(boost_unordered_node<X>)) * s.size() + MallocUsage(sizeof(void*) * s.bucket_count());
}
template<typename X, typename Y, typename Z>
static inline size_t DynamicUsage(const boost::unordered_map<X, Y, Z>& m)
{
return MallocUsage(sizeof(boost_unordered_node<std::pair<const X, Y> >)) * m.size() + MallocUsage(sizeof(void*) * m.bucket_count());
}
// Dispatch to class method as fallback
template<typename X>
static inline size_t DynamicUsage(const X& x)
{
return x.DynamicMemoryUsage();
}
}
#endif
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