boost python分段fau

Question

我在Python中编写了一个应用程序，其中的一部分用C++编写。Python绑定是用boost:：Python编写的，它只公开了一个名为merge\u charstrings的函数。我的C++库崩溃了一个分割错误，但是只有当通过Python访问时才会发生，并且只有当函数被调用不止一次时。Sebug本身的位置并不一定意味着Python绑定有问题，但我不能让它在纯C++演示中崩溃。在

函数merge_charstrings接受两个参数，这两个参数都是包含字符串和数字的列表，例如

[14, 344, 'hmoveto', 65, 'hlineto', -6, 24, -3, 44, 93, 'vvcurveto', 163, 'vlineto', 113, -70, 48, -98, -52, -59, -13, -35, -55, 'vhcurveto', 28, -52, 'rlineto', 20, 33, 40, 19, 57, 'hhcurveto', 59, 43, -32, -72, 'hvcurveto', -30, 'vlineto', -90, -3, -48, -2, -38, -5, -32, -16, 'rlinecurve', -48, -22, -32, -43, -63, 'vvcurveto', -91, 64, -55, 86, 59, 46, 28, 35, 37, 'vhcurveto', -4, 181, 'rmoveto', -120, 'vlineto', -23, -22, -44, -39, -59, 'hhcurveto', -54, -34, 36, 52, 31, 14, 27, 27, 15, 'hvcurveto', 21, 11, 27, 6, 41, 1, 'rrcurveto', 'endchar']

返回类型相同。这些转换为C++类型的STD:：vector & lt；CSTOKEN & GT；CsToken是我自己的类之一。在

下面是Python绑定代码。转换器基于this tutorial。在

^{pr2}$

很可能是因为bug是不存在的，因为StEnt错误经常是零星地出现，但是Valgrind在纯C++演示中没有报告错误，但是在Python演示中有很多错误。在

如果我只调用一次merge\u charstrings，Python演示就不会崩溃。如果我叫了两次，大多数时候都会崩溃。如果超过两次，它几乎总是会崩溃。在

from pycsmerge import *


if __name__ == '__main__':
    glyph = [
        472, 368, 'rmoveto', -133, 225, 258, 66, -589, -66, 257, -225, -133, -66, 133, -302, 74, 302, 133, 'hlineto', 'endchar'
    ]

    watermark = [
        0, -237, 'rmoveto', 28.3625, 0, 'rlineto', 274.1375, 425.96466584292557, 'rlineto', 274.13750000000005, -425.96466584292557, 'rlineto', 28.362499999999955, 0, 'rlineto', -288.31875, 448.0, 'rlineto', 288.31875, 448.0, 'rlineto', -28.362499999999955, 0, 'rlineto', -274.13750000000005, -425.96466584292557, 'rlineto', -274.1375, 425.96466584292557, 'rlineto', -28.3625, 0, 'rlineto', 288.31875, -448.0, 'rlineto', -288.31875, -448.0, 'rlineto', 0, 237, 'rmoveto'
    ]

    glyph2 = [
        478, 899, 'rmoveto', 53, -172, 'rlineto', 62, 'hlineto', -39, 172, 'rlineto', -548, -240, 'rmoveto', 337, -662, 'rlineto', 54, 'hlineto', 49, 123, 60, 86, 54, 68, 54, -71, 61, -85, 49, -121, 'rrcurveto', 55, 'hlineto', 326, 662, 'rlineto', -82, 'hlineto', -271, -559, 'rlineto', -2, 'hlineto', -39, 93, -55, 73, -51, 63, 'rrcurveto', 60, 71, 46, 61, 81, 'vvcurveto', 88, -64, 56, -87, -87, -65, -56, -89, -79, 46, -58, 61, -75, 'vhcurveto', -50, -62, -55, -74, -38, -93, 'rrcurveto', -2, 'hlineto', -281, 559, 'rlineto', 470, -37, 'rmoveto', 45, 32, -30, -55, -51, -32, -48, -44, -55, 'hvcurveto', -45, 56, -33, 50, 49, 'vvcurveto', 54, 33, 30, 44, 'vhcurveto', 'endchar'
    ]

    watermark2 = [
        0, -237, 'rmoveto', 28.3625, 0, 'rlineto', 526.6375, 436.2526262264391, 'rlineto', 526.6375, -436.2526262264391, 'rlineto', 28.362499999999955, 0, 'rlineto', -540.81875, 448.0, 'rlineto', 540.81875, 448.0, 'rlineto', -28.362499999999955, 0, 'rlineto', -526.6375, -436.2526262264391, 'rlineto', -526.6375, 436.2526262264391, 'rlineto', -28.3625, 0, 'rlineto', 540.81875, -448.0, 'rlineto', -540.81875, -448.0, 'rlineto', 0, 237, 'rmoveto'
    ]

    res1 = merge_charstrings(glyph, watermark)
    res2 = merge_charstrings(glyph2, watermark2)

    print(res1)
    print(res2)

堆栈跟踪如下：

#0  0x00007ffff647dcd1 in __gmpq_get_d ()
   from /usr/lib/x86_64-linux-gnu/libgmp.so.10
#1  0x00007ffff6766cd6 in CGAL::_Bezier_x_monotone_2<CGAL::Cartesian<CORE::BigRat>, CGAL::Cartesian<CORE::Expr>, CGAL::CORE_algebraic_number_traits, CGAL::Bezier_bounding_rational_traits<CGAL::Cartesian<CORE::BigRat> > >::parameter_range() const ()
   from /home/rob/python_envs/dfb/lib/python3.4/site-packages/_pycsmerge.so
#2  0x00007ffff675720e in csmerge::geometry::cubicBezierFromXMonoSection(CGAL::_Bezier_x_monotone_2<CGAL::Cartesian<CORE::BigRat>, CGAL::Cartesian<CORE::Expr>, CGAL::CORE_algebraic_number_traits, CGAL::Bezier_bounding_rational_traits<CGAL::Cartesian<CORE::BigRat> > > const&) ()
   from /home/rob/python_envs/dfb/lib/python3.4/site-packages/_pycsmerge.so
#3  0x00007ffff6757797 in csmerge::geometry::toPath(CGAL::General_polygon_2<CGAL::Arr_Bezier_curve_traits_2<CGAL::Cartesian<CORE::BigRat>, CGAL::Cartesian<CORE::Expr>, CGAL::CORE_algebraic_number_traits, CGAL::Bezier_bounding_rational_traits<CGAL::Cartesian<CORE::BigRat> > > > const&) ()
   from /home/rob/python_envs/dfb/lib/python3.4/site-packages/_pycsmerge.so
#4  0x00007ffff6757963 in csmerge::geometry::toPathList(std::vector<CGAL::General_polygon_with_holes_2<CGAL::General_polygon_2<CGAL::Arr_Bezier_curve_traits_2<CGAL::Cartesian<CORE::BigRat>, CGAL::Cartesian<CORE::Expr>, CGAL::CORE_algebraic_number_traits, CGAL::Bezier_bounding_rational_traits<CGAL::Cartesian<CORE::BigRat> > > > >, std::allocator<CGAL::General_polygon_with_holes_2<CGAL::General_polygon_2<CGAL::Arr_Bezier_curve_traits_2<CGAL::Cartesian<CORE::BigRat>, CGAL::Carte---Type <return> to continue, or q <return> to quit---
sian<CORE::Expr>, CGAL::CORE_algebraic_number_traits, CGAL::Bezier_bounding_rational_traits<CGAL::Cartesian<CORE::BigRat> > > > > > > const&) ()
   from /home/rob/python_envs/dfb/lib/python3.4/site-packages/_pycsmerge.so
#5  0x00007ffff6759200 in csmerge::geometry::Path::computeUnion(std::vector<csmerge::geometry::Path, std::allocator<csmerge::geometry::Path> > const&, std::vector<csmerge::geometry::Path, std::allocator<csmerge::geometry::Path> > const&)
    () from /home/rob/python_envs/dfb/lib/python3.4/site-packages/_pycsmerge.so
#6  0x00007ffff675274e in csmerge::mergeCharstrings(std::vector<csmerge::CsToken, std::allocator<csmerge::CsToken> > const&, std::vector<csmerge::CsToken, std::allocator<csmerge::CsToken> > const&) ()
   from /home/rob/python_envs/dfb/lib/python3.4/site-packages/_pycsmerge.so
#7  0x00007ffff674c02a in mergeCharstrings_helper(boost::python::list&, boost::python::list&) ()
   from /home/rob/python_envs/dfb/lib/python3.4/site-packages/_pycsmerge.so
#8  0x00007ffff674d542 in boost::python::objects::caller_py_function_impl<boost::python::detail::caller<boost::python::list (*)(boost::python::list&, boost::python::list&), boost::python::default_call_policies, boost::mpl::vector3<boost::python::list, boost::python::list&, boost::python::list&> > >::operator()(_object*, _object*) ()
   from /home/rob/python_envs/dfb/lib/python3.4/site-packages/_pycsmerge.so
#9  0x00007ffff623613a in boost::python::objects::function::call(_object*, _object*) const () from /usr/lib/x86_64-linux-gnu/libboost_python-py34.so.1.54.0
#10 0x00007ffff62364a8 in ?? ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/x86_64-linux-gnu/libboost_python-py34.so.1.54.0
#11 0x00007ffff6240953 in boost::python::detail::exception_handler::operator()(boost::function0<void> const&) const ()
   from /usr/lib/x86_64-linux-gnu/libboost_python-py34.so.1.54.0
#12 0x00007ffff674d443 in boost::detail::function::function_obj_invoker2<boost::_bi::bind_t<bool, boost::python::detail::translate_exception<csmerge::CsMergeException, void (*)(csmerge::CsMergeException const&)>, boost::_bi::list3<boost::arg<1>, boost::arg<2>, boost::_bi::value<void (*)(csmerge::CsMergeException const&)> > >, bool, boost::python::detail::exception_handler const&, boost::function0<void> const&>::invoke(boost::detail::function::function_buffer&, boost::python::detail::exception_handler const&, boost::function0<void> const&) ()
   from /home/rob/python_envs/dfb/lib/python3.4/site-packages/_pycsmerge.so
#13 0x00007ffff624071d in boost::python::handle_exception_impl(boost::function0<void>) () from /usr/lib/x86_64-linux-gnu/libboost_python-py34.so.1.54.0
#14 0x00007ffff6234db3 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libboost_python-py34.so.1.54.0
#15 0x000000000051c577 in PyEval_EvalFrameEx ()
#16 0x0000000000487164 in PyEval_EvalCode ()
#17 0x000000000056be90 in ?? ()
#18 0x000000000047b1c3 in PyRun_FileExFlags ()
#19 0x000000000047b5a0 in PyRun_SimpleFileExFlags ()
#20 0x00000000005c0b33 in Py_Main ()
#21 0x000000000047dbc1 in main ()

我很感激你的帮助。谢谢