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made the struct layout of entry be the same in debug builds as release builds to make that part of the ABI stable

This commit is contained in:
Arvid Norberg 2010-06-06 00:47:39 +00:00
parent 83dbc1d9f1
commit df49e9d26b
2 changed files with 138 additions and 128 deletions
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158
include/libtorrent/entry.hpp
View File

@ -163,28 +163,16 @@ namespace libtorrent
private:
#ifndef TORRENT_DEBUG
data_type m_type;
#if (defined(_MSC_VER) && _MSC_VER < 1310) || TORRENT_COMPLETE_TYPES_REQUIRED
// workaround for msvc-bug.
// assumes sizeof(map<string, char>) == sizeof(map<string, entry>)
// and sizeof(list<char>) == sizeof(list<entry>)
integer_type data[
(max4<sizeof(std::list<char>)
, sizeof(std::map<std::string, char>)
, sizeof(string_type)
, sizeof(integer_type)>::value + sizeof(integer_type) - 1)
/ sizeof(integer_type)];
#else
integer_type data[
(max4<sizeof(list_type)
, sizeof(dictionary_type)
, sizeof(string_type)
, sizeof(integer_type)>::value + sizeof(integer_type) - 1)
/ sizeof(integer_type)];
#endif
// the bitfield is used so that the m_type_queried
// field still fits, so that the ABI is the same for
// debug builds and release builds. It appears to be
// very hard to match debug builds with debug versions
// of libtorrent
data_type m_type:31;
#ifdef TORRENT_DEBUG
public:
// in debug mode this is set to false by bdecode
// to indicate that the program has not yet queried
@ -192,8 +180,30 @@ namespace libtorrent
// that it has a certain type. This is asserted in
// the accessor functions. This does not apply if
// exceptions are used.
mutable bool m_type_queried;
mutable bool m_type_queried:1;
protected:
#endif // TORRENT_DEBUG
#if (defined(_MSC_VER) && _MSC_VER < 1310) || TORRENT_COMPLETE_TYPES_REQUIRED
// workaround for msvc-bug.
// assumes sizeof(map<string, char>) == sizeof(map<string, entry>)
// and sizeof(list<char>) == sizeof(list<entry>)
enum { union_size
= max4<sizeof(std::list<char>)
, sizeof(std::map<std::string, char>)
, sizeof(string_type)
, sizeof(integer_type)>::value
};
#else
enum { union_size
= max4<sizeof(list_type)
, sizeof(dictionary_type)
, sizeof(string_type)
, sizeof(integer_type)>::value
};
#endif
integer_type m_data[(union_size + sizeof(integer_type) - 1)
/ sizeof(integer_type)];
};
#if defined TORRENT_DEBUG && TORRENT_USE_IOSTREAM
@ -212,114 +222,6 @@ namespace libtorrent
}
#endif
inline entry::data_type entry::type() const
{
#ifdef TORRENT_DEBUG
m_type_queried = true;
#endif
return m_type;
}
inline entry::~entry() { destruct(); }
inline void entry::operator=(const entry& e)
{
destruct();
copy(e);
}
inline entry::integer_type& entry::integer()
{
if (m_type == undefined_t) construct(int_t);
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != int_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == int_t);
return *reinterpret_cast<integer_type*>(data);
}
inline entry::integer_type const& entry::integer() const
{
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != int_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == int_t);
return *reinterpret_cast<const integer_type*>(data);
}
inline entry::string_type& entry::string()
{
if (m_type == undefined_t) construct(string_t);
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != string_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == string_t);
return *reinterpret_cast<string_type*>(data);
}
inline entry::string_type const& entry::string() const
{
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != string_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == string_t);
return *reinterpret_cast<const string_type*>(data);
}
inline entry::list_type& entry::list()
{
if (m_type == undefined_t) construct(list_t);
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != list_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == list_t);
return *reinterpret_cast<list_type*>(data);
}
inline entry::list_type const& entry::list() const
{
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != list_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == list_t);
return *reinterpret_cast<const list_type*>(data);
}
inline entry::dictionary_type& entry::dict()
{
if (m_type == undefined_t) construct(dictionary_t);
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != dictionary_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == dictionary_t);
return *reinterpret_cast<dictionary_type*>(data);
}
inline entry::dictionary_type const& entry::dict() const
{
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != dictionary_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == dictionary_t);
return *reinterpret_cast<const dictionary_type*>(data);
}
}
#endif // TORRENT_ENTRY_HPP_INCLUDED

108
src/entry.cpp
View File

@ -142,6 +142,114 @@ namespace libtorrent
}
#endif
entry::data_type entry::type() const
{
#ifdef TORRENT_DEBUG
m_type_queried = true;
#endif
return m_type;
}
entry::~entry() { destruct(); }
void entry::operator=(const entry& e)
{
destruct();
copy(e);
}
entry::integer_type& entry::integer()
{
if (m_type == undefined_t) construct(int_t);
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != int_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == int_t);
return *reinterpret_cast<integer_type*>(data);
}
entry::integer_type const& entry::integer() const
{
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != int_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == int_t);
return *reinterpret_cast<const integer_type*>(data);
}
entry::string_type& entry::string()
{
if (m_type == undefined_t) construct(string_t);
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != string_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == string_t);
return *reinterpret_cast<string_type*>(data);
}
entry::string_type const& entry::string() const
{
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != string_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == string_t);
return *reinterpret_cast<const string_type*>(data);
}
entry::list_type& entry::list()
{
if (m_type == undefined_t) construct(list_t);
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != list_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == list_t);
return *reinterpret_cast<list_type*>(data);
}
entry::list_type const& entry::list() const
{
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != list_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == list_t);
return *reinterpret_cast<const list_type*>(data);
}
entry::dictionary_type& entry::dict()
{
if (m_type == undefined_t) construct(dictionary_t);
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != dictionary_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == dictionary_t);
return *reinterpret_cast<dictionary_type*>(data);
}
entry::dictionary_type const& entry::dict() const
{
#ifndef BOOST_NO_EXCEPTIONS
if (m_type != dictionary_t) throw_type_error();
#elif defined TORRENT_DEBUG
TORRENT_ASSERT(m_type_queried);
#endif
TORRENT_ASSERT(m_type == dictionary_t);
return *reinterpret_cast<const dictionary_type*>(data);
}
entry::entry()
: m_type(undefined_t)
{