Re: ?python::boost throw issues?

From: rwgk_at_[hidden]
Date: 2001-04-16 18:55:07

We had a similar problem with mingw32 on Windows (mingw32 is
based on gcc 2.95.2). The problem disappeared when we started
using "-g" instead of "-O". Here is David Abraham's comment:

> Yes, GCC exception-handling is almost universally broken, 
especially when
> there are optimizations. Cygnus has a test suite of mine that 
flushes many
> of the problems and they have used it on the pending GCC 3.0 
StrongArm
> target, but I have no information about whether they are using it to
> validate other backends :(

Ralf

--- In boost_at_y..., "Norman Shelley (rrdn60)" <rrdn60_at_e...> wrote:
> Last week I had a program that on occasion would throw an error and 
it
> would show up in the python environment perfectly. This week I'm 
having
> problems. Throwing an error causes seg faults.  See two examples 
using
> the same shared library below.
> 
> 
> % python2.1
> Python 2.1b2 (#2, Apr  5 2001, 11:37:45)
> [GCC 2.95.3 20010315 (release)] on hp-uxB
> Type "copyright", "credits" or "license" for more information.
> >>> import tst
> >>> tst.amethod()
> amethod 'VOID'
> amethod before throw
> ( 0)  0xc0428cb8   _sigreturn  [/usr/lib/libc.1]
> ( 1)  0xc20c92b8   
call__CQ45boost6python6detail8functionP7_objectT1 +
> 0x578  [/usr/local/lib/libboost_python.sl]
> Segmentation fault
> 
> 
> 
> % python2.1
> Python 2.1b2 (#2, Apr  5 2001, 11:37:45)
> [GCC 2.95.3 20010315 (release)] on hp-uxB
> Type "copyright", "credits" or "license" for more information.
> >>> import tst
> >>> tst.world()
> World creation 'VOID'
> World creation before throw
> ( 0)  0xc0428cb8   _sigreturn  [/usr/lib/libc.1]
> ( 1)  0xc20c92b8   
call__CQ45boost6python6detail8functionP7_objectT1 +
> 0x578  [/usr/local/lib/libboost_python.sl]
> ( 2)  0xc20cc590
> 
instance_call__CQ45boost6python6detailt8callable1ZQ45boost6python6deta
ilt11type_
> + 0x70  [/usr/local/lib/libboost_python.sl]
> ( 3)  0xc20e82dc
> 
call__H2ZP7_objectZP7_object_Q35boost6python26_GLOBAL_$N$types.cppC5Xi
8aP7_objec
> + 0x1cc  [/usr/local/lib/libboost_python.sl]
> ( 4)  0xc20e15c0   do_instance_call + 0x50
> [/usr/local/lib/libboost_python.sl]
> ( 5)  0x00079068   call_object + 0xa8  [/usr/local/bin/python2.1]
> ( 6)  0x00078f68   PyEval_CallObjectWithKeywords + 0xc8
> [/usr/local/bin/python2.1]
> ( 7)  0xc20ca06c
> call__CQ45boost6python6detail14bound_functionP7_objectT1 + 0x38c
> [/usr/local/lib/libboost_python.sl]
> ( 8)  0xc20cc240
> 
instance_call__CQ45boost6python6detailt8callable1ZQ45boost6python6deta
ilt11type_
> + 0x70  [/usr/local/lib/libboost_python.sl]
> Segmentation fault
> 
> 
> 
> 
> #include <string>
> #include <boost/python/classes.hpp>
> #include <boost/python/class_builder.hpp>
> #include <boost/python/module_builder.hpp>
> #include <boost/python/errors.hpp>
> 
> namespace python = boost::python;
> 
> 
> 
> namespace { // Avoid cluttering the global namespace.
>  void amethod() {
>   fprintf(stderr, "amethod 'VOID'\n");
>   PyErr_SetString(PyExc_TypeError, "wrong number of arguments");
>   fprintf(stderr, "amethod before throw\n");
>   throw boost::python::argument_error();
>  }
> 
> 
>   // A friendly class.
>   class world
>   {
>     public:
>   world() {
>    fprintf(stderr, "World creation 'VOID'\n");
>    PyErr_SetString(PyExc_TypeError, "wrong number of arguments");
>    fprintf(stderr, "World creation before throw\n");
>    throw boost::python::argument_error();
>   }
> 
>   };
> }
> 
> 
> extern "C" {
>  void U_STACK_TRACE(int);
> }
> 
> 
> // Python requires an exported function called init<module-name> in
> every
> // extension module. This is where we build the module contents.
> BOOST_PYTHON_MODULE_INIT(tst)
> {
>  signal(SIGSEGV, U_STACK_TRACE);
>  try
>  {
>   // Create an object representing this extension module
>   python::module_builder this_module("tst");
> 
>   this_module.def(amethod, "amethod");
> 
>   // Create the Python type object for our extension class.
>   python::class_builder<world> world_class(this_module, "world");
> 
>   // Add the __init__ function.
>   world_class.def(python::constructor<>());
>  }
>  catch(...)
>  {
>   python::handle_exception(); // Deal with the exception for Python
>  }
> }