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// Copyright 2016 Klemens Morgenstern, Antony Polukhin
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org
#ifndef INCLUDE_BOOST_DLL_DETAIL_CTOR_DTOR_HPP_
#define INCLUDE_BOOST_DLL_DETAIL_CTOR_DTOR_HPP_
#include <boost/config.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
# pragma once
#endif
#include <boost/dll/detail/aggressive_ptr_cast.hpp>
#include <boost/dll/detail/get_mem_fn_type.hpp>
#if defined(BOOST_MSVC) || defined(BOOST_MSVC_VER)
# include <boost/dll/detail/demangling/msvc.hpp>
#else
# include <boost/dll/detail/demangling/itanium.hpp>
#endif
namespace boost { namespace dll { namespace detail {
/*!
* This class stores a constructor.
*
* In some compilers there are several constructors in code, which may include an allocating one.
* This can be used if the imported class shall be put on the heap, which is why the class provied both types.
*/
template<typename Signature>
struct constructor;
template<typename Class, typename ...Args>
struct constructor<Class(Args...)> {
typedef typename detail::get_mem_fn_type<Class, void(Args...)>::mem_fn standard_t;
typedef Class*(*allocating_t)(Args...);
//! The standard, i.e. not allocating constructor. @warning May differ with the compiler. Use @ref constructor::call_standard instead.
standard_t standard;
//! The allocating constructor. @warning May differ with the compiler. Use @ref constructor::call_allocating instead.
allocating_t allocating;
//! Call the standard contructor
void call_standard (Class * const ptr, Args...args){ (ptr->*standard)(static_cast<Args>(args)...); }
//! Call the deleting destructor
Class * call_allocating(Args...args){ return allocating(static_cast<Args>(args)...); }
//! True if a allocating constructor could be loaded.
bool has_allocating() const { return allocating != nullptr; }
//! False if neither the allocating nor the standard constructor is available.
bool is_empty() const { return !((allocating == nullptr) && (standard != nullptr)) ; }
constructor() = delete;
constructor(const constructor &) = default;
explicit constructor(standard_t standard, allocating_t allocating = nullptr)
: standard(standard)
, allocating(allocating)
{}
};
template <typename Class>
struct destructor {
#if !defined(BOOST_MSVC) && !defined(BOOST_MSVC_VER)
typedef void( *type)(Class* const);
#elif !defined(_WIN64)
typedef void(__thiscall * type)(Class* const);
#else
typedef void(__cdecl * type)(Class* const);
#endif
typedef type standard_t;
typedef type deleting_t;
//! The standard, i.e. not deleting destructor. @warning May differ with the compiler. Use @ref destructor::call_standard instead.
standard_t standard;
//! The deleting destructor. @warning May differ with the compiler. Use @ref destructor::call_deallocating instead.
deleting_t deleting;
//! Call the standard contructor
void call_standard(Class * const ptr){ standard(ptr); }
//! Call the deleting destructor
void call_deleting(Class * const ptr){ deleting(ptr); }
//! True if a deleting destructor could be loaded.
bool has_deleting() const { return deleting != nullptr; }
//! False if neither the deleting nor the standard destructor is available.
bool is_empty() const { return !((deleting == nullptr) && (standard != nullptr)) ; }
destructor() = delete;
//! Copy destructor.
destructor(const destructor &) = default;
//! Construct it from both the standard destructor and the allocating destructor
explicit destructor(const standard_t &standard, const deleting_t &deleting = nullptr)
: standard(standard)
, deleting(deleting)
{}
};
#if defined(BOOST_MSVC) || defined(BOOST_MSVC_VER)
template<typename Signature, typename Lib>
constructor<Signature> load_ctor(Lib & lib, const mangled_storage_impl::ctor_sym & ct) {
typedef typename constructor<Signature>::standard_t standard_t;
standard_t ctor = lib.template get<standard_t>(ct);
return constructor<Signature>(ctor);
}
template<typename Class, typename Lib>
destructor<Class> load_dtor(Lib & lib, const mangled_storage_impl::dtor_sym & dt) {
typedef typename destructor<Class>::standard_t standard_t;
standard_t dtor = &lib.template get< typename boost::remove_pointer<standard_t>::type >(dt);
return destructor<Class>(dtor);
}
#else
template<typename Signature, typename Lib>
constructor<Signature> load_ctor(Lib & lib, const mangled_storage_impl::ctor_sym & ct) {
typedef typename constructor<Signature>::standard_t stand;
typedef typename constructor<Signature>::allocating_t alloc;
stand s = nullptr;
alloc a = nullptr;
//see here for the abi http://mentorembedded.github.io/cxx-abi/abi.html#mangling-special-ctor-dtor
if (!ct.C1.empty()) {
s = lib.template get<stand>(ct.C1);
}
if (!ct.C3.empty()) {
a = lib.template get<alloc>(ct.C3);
}
return constructor<Signature>(s,a);
}
template<typename Class, typename Lib>
destructor<Class> load_dtor(Lib & lib, const mangled_storage_impl::dtor_sym & dt) {
typedef typename destructor<Class>::standard_t stand;
typedef typename destructor<Class>::deleting_t delet;
stand s = nullptr;
delet d = nullptr;
//see here for the abi http://mentorembedded.github.io/cxx-abi/abi.html#mangling-special-ctor-dtor
if (!dt.D1.empty()) {
s = &lib.template get< typename boost::remove_pointer<stand>::type >(dt.D1);
}
if (!dt.D0.empty()) {
d = &lib.template get< typename boost::remove_pointer<delet>::type >(dt.D0);
}
return destructor<Class>(s,d);
}
#endif
}}} // namespace boost::dll::detail
#endif /* INCLUDE_BOOST_DLL_DETAIL_CTOR_DTOR_HPP_ */
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