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Runtime detection of broken cxxabi::__cxa_demangle versions; based on code contributed by Ult Mundane

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[SVN r32296]
This commit is contained in:
Ralf W. Grosse-Kunstleve
2006-01-12 19:12:27 +00:00
parent d10b5e8d1a
commit 19a196493f
2 changed files with 60 additions and 1 deletions
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7
include/boost/python/type_id.hpp
View File

@@ -35,6 +35,13 @@ namespace boost { namespace python {
# define BOOST_PYTHON_TYPE_ID_NAME
# endif
#ifdef BOOST_PYTHON_HAVE_GCC_CP_DEMANGLE
// Runtime detection of broken cxxabi::__cxa_demangle versions,
// to avoid #ifdef clutter.
bool cxxabi_cxa_demangle_is_broken();
#define BOOST_PYTHON_HAVE_CXXABI_CXA_DEMANGLE_IS_BROKEN
#endif
// type ids which represent the same information as std::type_info
// (i.e. the top-level reference and cv-qualifiers are stripped), but
// which works across shared libraries.

54
src/converter/type_id.cpp
View File

@@ -18,7 +18,6 @@
# include <ostream.h>
#endif
# ifdef BOOST_PYTHON_HAVE_GCC_CP_DEMANGLE
# if defined(__GNUC__) && __GNUC__ >= 3
@@ -78,6 +77,21 @@ namespace
};
}
bool cxxabi_cxa_demangle_is_broken()
{
static bool was_tested = false;
static bool is_broken = false;
if (!was_tested) {
int status;
free_mem keeper(cxxabi::__cxa_demangle("b", 0, 0, &status));
was_tested = true;
if (status == -2 || strcmp(keeper.p, "bool") != 0) {
is_broken = true;
}
}
return is_broken;
}
namespace detail
{
BOOST_PYTHON_DECL char const* gcc_demangle(char const* mangled)
@@ -115,6 +129,44 @@ namespace detail
? mangled
: keeper.p;
// Ult Mundane, 2005 Aug 17
// Contributed 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)
// The __cxa_demangle function is supposed to translate
// builtin types from their one-character mangled names,
// but it doesn't in gcc 3.3.5 and gcc 3.4.x.
if (cxxabi_cxa_demangle_is_broken()
&& status == -2 && strlen(mangled) == 1)
{
// list from
// http://www.codesourcery.com/cxx-abi/abi.html
switch (mangled[0])
{
case 'v': demangled = "void"; break;
case 'w': demangled = "wchar_t"; break;
case 'b': demangled = "bool"; break;
case 'c': demangled = "char"; break;
case 'a': demangled = "signed char"; break;
case 'h': demangled = "unsigned char"; break;
case 's': demangled = "short"; break;
case 't': demangled = "unsigned short"; break;
case 'i': demangled = "int"; break;
case 'j': demangled = "unsigned int"; break;
case 'l': demangled = "long"; break;
case 'm': demangled = "unsigned long"; break;
case 'x': demangled = "long long"; break;
case 'y': demangled = "unsigned long long"; break;
case 'n': demangled = "__int128"; break;
case 'o': demangled = "unsigned __int128"; break;
case 'f': demangled = "float"; break;
case 'd': demangled = "double"; break;
case 'e': demangled = "long double"; break;
case 'g': demangled = "__float128"; break;
case 'z': demangled = "..."; break;
}
}
p = demangler.insert(p, std::make_pair(mangled, demangled));
keeper.p = 0;
}