libvtv/vtv_fail.h

   1 // Copyright (C) 2012-2017 Free Software Foundation, Inc.
   2 //
   3 // This file is part of GCC.
   4 //
   5 // GCC is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; either version 3, or (at your option)
   8 // any later version.
   9
  10 // GCC is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // Under Section 7 of GPL version 3, you are granted additional
  16 // permissions described in the GCC Runtime Library Exception, version
  17 // 3.1, as published by the Free Software Foundation.
  18
  19 // You should have received a copy of the GNU General Public License and
  20 // a copy of the GCC Runtime Library Exception along with this program;
  21 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  22 // <http://www.gnu.org/licenses/>.
  23
  24 #ifndef _VTV_FAIL_H
  25 #define _VTV_FAIL_H 1
  26
  27 /* __vtv_really_fail prints a backtrace and a memory dump, then calls
  28   abort.  It is here for programmers to call, presumably from
  29   __vtv_verify_fail, if they choose to overwrite the standard
  30   __vtv_verify_fail with one of their own.  Programmers should NOT
  31   attempt to rewrite __vtv_really_fail. */
  32
  33 extern void
  34 __vtv_really_fail (const char *fail_msg)
  35   __attribute__ ((visibility ("default"), noreturn, nothrow));
  36
  37 /* __vtv_verify_fail is the function that gets called if the vtable
  38   verification code discovers a vtable pointer that it cannot verify
  39   as valid.  Normally __vtv_verify_fail calls __vtv_really_fail.
  40   However programmers can write and link in their own version of
  41   __vtv_verify_fail, if they wish to do some kind of secondary
  42   verification, for example.  The main verification code assumes that
  43   IF __vtv_verify_fail returns, then some kind of secondary
  44   verification was done AND that the secondary verification succeeded,
  45   i.e. that the vtable pointer is actually valid and ok to use.  If
  46   the secondary verification fails, then __vtv_verify_fail should not
  47   return.  */
  48
  49 extern void
  50 __vtv_verify_fail (void **data_set_ptr, const void *vtbl_pointer)
  51   __attribute__((visibility ("default"), nothrow));
  52
  53 extern void
  54 __vtv_verify_fail_debug (void **data_set_ptr, const void *vtbl_pointer,
  55                          const char *debug_msg)
  56   __attribute__((visibility ("default"), nothrow));
  57
  58 #endif /* _VTV_FAIL_H */