[c++] parameter passing bug

[Benjamin Kosnik <bkoz at redhat dot com>]

The following small test case shows a bug with argument passing. I've
tried v3-abi and the old abi in current sources and both get it wrong:

(gdb) p c30
$1 = 32 ' '

yet inside the function gctype.is, c30 == -112

Breakpoint 1, main () at kill.cc:69
0x8090186 in std::ctype<char>::is (this=0x2e322e32, __m=space, __c=-112 '\220')
    at kill.cc:62
(gdb) p __c



-benjamin

// 2000-12-13 bkoz
namespace std
{
  struct ctype_base
  {
    // Non-standard typedefs.
    typedef const int* 		__to_type;

    enum mask
    {
      space  = (1 << 8),     // Whitespace
      _M_ctype_base_mask_end = 1 << 12
    };
  };

  template<typename _CharT>
  //    class __ctype_abstract_base : public locale::facet, public ctype_base
  class __ctype_abstract_base :  public ctype_base
    {
    public:
      // Types:
      typedef _CharT char_type;

      bool 
      is(mask __m, char_type __c) const throw()
      { return this->do_is(__m, __c); }
    protected:
      virtual bool 
      do_is(mask __m, char_type __c) const throw() = 0;
    };

  template<typename _CharT>
    class ctype : public __ctype_abstract_base<_CharT> {};


  // 22.2.1.3  ctype specializations
  template<>
    class ctype<char> : public __ctype_abstract_base<char>
    {
    public:
      // Types:
      typedef char 	       char_type;

      inline bool 
      is(mask __m, char __c) const throw();
    protected:
      virtual bool 
      do_is(mask __m, char_type __c) const throw() { return true; }
    };

  bool
  ctype<char>::is(mask __m, char __c) const throw()
  { return static_cast<mask>(__c) & __m; } // here __c != ' '
}

class gnu_ctype: public std::ctype<char> { };

int main()
{
  char c30 = ' ';
  gnu_ctype gctype;

  bool test = gctype.is(std::ctype_base::space, c30); // step in here...
  
  return 0;
}