libstdc++-v3/libsupc++/pure.cc

   1 // -*- C++ -*-
   2 // Copyright (C) 2000 Free Software Foundation
   3 //
   4 // This file is part of GNU CC.
   5 //
   6 // GNU CC is free software; you can redistribute it and/or modify
   7 // it under the terms of the GNU General Public License as published by
   8 // the Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10 //
  11 // GNU CC is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License
  17 // along with GNU CC; see the file COPYING.  If not, write to
  18 // the Free Software Foundation, 59 Temple Place - Suite 330,
  19 // Boston, MA 02111-1307, USA.
  20 //
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 #include <bits/c++config.h>
  31
  32 #ifdef _GLIBCPP_HAVE_UNISTD_H
  33 # include <unistd.h>
  34 # define writestr(str)  write(2, str, sizeof(str) - 1)
  35 # ifdef __GNU_LIBRARY__
  36   /* Avoid forcing the library's meaning of `write' on the user program
  37      by using the "internal" name (for use within the library).  */
  38 /*#  define write(fd, buf, n)   __write((fd), (buf), (n))*/
  39 # endif
  40 #else
  41 # include <stdio.h>
  42 # define writestr(str)  fputs(str, stderr)
  43 #endif
  44
  45 extern "C" {
  46
  47 extern void __terminate(void) __attribute__ ((__noreturn__));
  48
  49 // The name of the function to be placed in vtables in place of a pure
  50 // virtual function is different in the two ABIs.
  51 #if !defined(__GXX_ABI_VERSION) || __GXX_ABI_VERSION < 100
  52 #define PURE_VIRTUAL_NAME __pure_virtual
  53 #else
  54 #define PURE_VIRTUAL_NAME __cxa_pure_virtual
  55 #endif
  56
  57 void
  58 PURE_VIRTUAL_NAME (void)
  59 {
  60   writestr ("pure virtual method called\n");
  61   __terminate ();
  62 }
  63
  64 }