phmap_dump.h

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#if !defined(phmap_dump_h_guard_)
#define phmap_dump_h_guard_
 
// ---------------------------------------------------------------------------
// Copyright (c) 2019, Gregory Popovitch - greg7mdp@gmail.com
//
//       providing dump/load/mmap_load
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ---------------------------------------------------------------------------
 
#include <iostream>
#include <fstream>
#include <sstream>
#include "phmap.h"
namespace phmap
{
 
namespace type_traits_internal {
 
#if defined(__GLIBCXX__) && __GLIBCXX__ < 20150801
    template<typename T> struct IsTriviallyCopyable : public std::integral_constant<bool, __has_trivial_copy(T)> {};
#else
    template<typename T> struct IsTriviallyCopyable : public std::is_trivially_copyable<T> {};
#endif
 
template <class T1, class T2>
struct IsTriviallyCopyable<std::pair<T1, T2>> {
    static constexpr bool value = IsTriviallyCopyable<T1>::value && IsTriviallyCopyable<T2>::value;
};
}
 
namespace priv {
 
#if !defined(PHMAP_NON_DETERMINISTIC) && !defined(PHMAP_DISABLE_DUMP)
 
// ------------------------------------------------------------------------
// dump/load for raw_hash_set
// ------------------------------------------------------------------------
template <class Policy, class Hash, class Eq, class Alloc>
template<typename OutputArchive>
bool raw_hash_set<Policy, Hash, Eq, Alloc>::phmap_dump(OutputArchive& ar) const {
    static_assert(type_traits_internal::IsTriviallyCopyable<value_type>::value,
                    "value_type should be trivially copyable");
 
    ar.saveBinary(&size_, sizeof(size_t));
    ar.saveBinary(&capacity_, sizeof(size_t));
    if (size_ == 0)
        return true;
    ar.saveBinary(ctrl_,  sizeof(ctrl_t) * (capacity_ + Group::kWidth + 1));
    ar.saveBinary(slots_, sizeof(slot_type) * capacity_);
    return true;
}
 
template <class Policy, class Hash, class Eq, class Alloc>
template<typename InputArchive>
bool raw_hash_set<Policy, Hash, Eq, Alloc>::phmap_load(InputArchive& ar) {
    static_assert(type_traits_internal::IsTriviallyCopyable<value_type>::value,
                    "value_type should be trivially copyable");
    raw_hash_set<Policy, Hash, Eq, Alloc>().swap(*this); // clear any existing content
    ar.loadBinary(&size_, sizeof(size_t));
    ar.loadBinary(&capacity_, sizeof(size_t));
 
    if (capacity_) {
        // allocate memory for ctrl_ and slots_
        initialize_slots(capacity_);
    }
    if (size_ == 0)
        return true;
    ar.loadBinary(ctrl_,  sizeof(ctrl_t) * (capacity_ + Group::kWidth + 1));
    ar.loadBinary(slots_, sizeof(slot_type) * capacity_);
    return true;
}
 
// ------------------------------------------------------------------------
// dump/load for parallel_hash_set
// ------------------------------------------------------------------------
template <size_t N,
          template <class, class, class, class> class RefSet,
          class Mtx_,
          class Policy, class Hash, class Eq, class Alloc>
template<typename OutputArchive>
bool parallel_hash_set<N, RefSet, Mtx_, Policy, Hash, Eq, Alloc>::phmap_dump(OutputArchive& ar) const {
    static_assert(type_traits_internal::IsTriviallyCopyable<value_type>::value,
                  "value_type should be trivially copyable");
 
    size_t submap_count = subcnt();
    ar.saveBinary(&submap_count, sizeof(size_t));
    for (size_t i = 0; i < sets_.size(); ++i) {
        auto& inner = sets_[i];
        typename Lockable::UniqueLock m(const_cast<Inner&>(inner));
        if (!inner.set_.phmap_dump(ar)) {
            std::cerr << "Failed to dump submap " << i << std::endl;
            return false;
        }
    }
    return true;
}
 
template <size_t N,
          template <class, class, class, class> class RefSet,
          class Mtx_,
          class Policy, class Hash, class Eq, class Alloc>
template<typename InputArchive>
bool parallel_hash_set<N, RefSet, Mtx_, Policy, Hash, Eq, Alloc>::phmap_load(InputArchive& ar) {
    static_assert(type_traits_internal::IsTriviallyCopyable<value_type>::value,
                  "value_type should be trivially copyable");
 
    size_t submap_count = 0;
    ar.loadBinary(&submap_count, sizeof(size_t));
    if (submap_count != subcnt()) {
        std::cerr << "submap count(" << submap_count << ") != N(" << N << ")" << std::endl;
        return false;
    }
 
    for (size_t i = 0; i < submap_count; ++i) {            
        auto& inner = sets_[i];
        typename Lockable::UniqueLock m(const_cast<Inner&>(inner));
        if (!inner.set_.phmap_load(ar)) {
            std::cerr << "Failed to load submap " << i << std::endl;
            return false;
        }
    }
    return true;
}
 
#endif // !defined(PHMAP_NON_DETERMINISTIC) && !defined(PHMAP_DISABLE_DUMP)
 
} // namespace priv
 
 
 
// ------------------------------------------------------------------------
// BinaryArchive
//       File is closed when archive object is destroyed
// ------------------------------------------------------------------------
 
// ------------------------------------------------------------------------
// ------------------------------------------------------------------------
class BinaryOutputArchive {
public:
    BinaryOutputArchive(const char *file_path) {
        ofs_.open(file_path, std::ofstream::out | std::ofstream::trunc | std::ofstream::binary);
    }
 
    bool saveBinary(const void *p, size_t sz) {
        ofs_.write(reinterpret_cast<const char*>(p), sz);
        return true;
    }
 
    template<typename V>
    typename std::enable_if<type_traits_internal::IsTriviallyCopyable<V>::value, bool>::type
    saveBinary(const V& v) {
        ofs_.write(reinterpret_cast<const char *>(&v), sizeof(V));
        return true;
    }
 
    template<typename Map>
    auto saveBinary(const Map& v) -> decltype(v.phmap_dump(*this), bool())
    {
        return v.phmap_dump(*this);
    }
 
private:
    std::ofstream ofs_;
};
 
 
class BinaryInputArchive {
public:
    BinaryInputArchive(const char * file_path) {
        ifs_.open(file_path, std::ofstream::in | std::ofstream::binary);
    }
 
    bool loadBinary(void* p, size_t sz) {
        ifs_.read(reinterpret_cast<char*>(p), sz);
        return true;
    }
 
    template<typename V>
    typename std::enable_if<type_traits_internal::IsTriviallyCopyable<V>::value, bool>::type
    loadBinary(V* v) {
        ifs_.read(reinterpret_cast<char *>(v), sizeof(V));
        return true;
    }
 
    template<typename Map>
    auto loadBinary(Map* v) -> decltype(v->phmap_load(*this), bool())
    {
        return v->phmap_load(*this);
    }
    
private:
    std::ifstream ifs_;
};
 
} // namespace phmap
 
 
#ifdef CEREAL_SIZE_TYPE
 
template <class T>
using PhmapTrivCopyable = typename phmap::type_traits_internal::IsTriviallyCopyable<T>;
    
namespace cereal
{
    // Overload Cereal serialization code for phmap::flat_hash_map
    // -----------------------------------------------------------
    template <class K, class V, class Hash, class Eq, class A>
    void save(typename std::enable_if<PhmapTrivCopyable<K>::value && PhmapTrivCopyable<V>::value, typename cereal::BinaryOutputArchive>::type &ar,
              phmap::flat_hash_map<K, V, Hash, Eq, A> const &hmap)
    {
        hmap.phmap_dump(ar);
    }
 
    template <class K, class V, class Hash, class Eq, class A>
    void load(typename std::enable_if<PhmapTrivCopyable<K>::value && PhmapTrivCopyable<V>::value, typename cereal::BinaryInputArchive>::type &ar, 
              phmap::flat_hash_map<K, V, Hash, Eq, A>  &hmap)
    {
        hmap.phmap_load(ar);
    }
 
 
    // Overload Cereal serialization code for phmap::parallel_flat_hash_map
    // --------------------------------------------------------------------
    template <class K, class V, class Hash, class Eq, class A, size_t N, class Mtx_>
    void save(typename std::enable_if<PhmapTrivCopyable<K>::value && PhmapTrivCopyable<V>::value, typename cereal::BinaryOutputArchive>::type &ar,
              phmap::parallel_flat_hash_map<K, V, Hash, Eq, A, N, Mtx_> const &hmap)
    {
        hmap.phmap_dump(ar);
    }
 
    template <class K, class V, class Hash, class Eq, class A, size_t N, class Mtx_>
    void load(typename std::enable_if<PhmapTrivCopyable<K>::value && PhmapTrivCopyable<V>::value, typename cereal::BinaryInputArchive>::type &ar, 
              phmap::parallel_flat_hash_map<K, V, Hash, Eq, A, N, Mtx_>  &hmap)
    {
        hmap.phmap_load(ar);
    }
 
    // Overload Cereal serialization code for phmap::flat_hash_set
    // -----------------------------------------------------------
    template <class K, class Hash, class Eq, class A>
    void save(typename std::enable_if<PhmapTrivCopyable<K>::value, typename cereal::BinaryOutputArchive>::type &ar,
              phmap::flat_hash_set<K, Hash, Eq, A> const &hset)
    {
        hset.phmap_dump(ar);
    }
 
    template <class K, class Hash, class Eq, class A>
    void load(typename std::enable_if<PhmapTrivCopyable<K>::value, typename cereal::BinaryInputArchive>::type &ar, 
              phmap::flat_hash_set<K, Hash, Eq, A>  &hset)
    {
        hset.phmap_load(ar);
    }
 
    // Overload Cereal serialization code for phmap::parallel_flat_hash_set
    // --------------------------------------------------------------------
    template <class K, class Hash, class Eq, class A, size_t N, class Mtx_>
    void save(typename std::enable_if<PhmapTrivCopyable<K>::value, typename cereal::BinaryOutputArchive>::type &ar,
              phmap::parallel_flat_hash_set<K, Hash, Eq, A, N, Mtx_> const &hset)
    {
        hset.phmap_dump(ar);
    }
 
    template <class K, class Hash, class Eq, class A, size_t N, class Mtx_>
    void load(typename std::enable_if<PhmapTrivCopyable<K>::value, typename cereal::BinaryInputArchive>::type &ar, 
              phmap::parallel_flat_hash_set<K, Hash, Eq, A, N, Mtx_>  &hset)
    {
        hset.phmap_load(ar);
    }
}
 
#endif
 
 
 
 
#endif // phmap_dump_h_guard_