gdb/testsuite/gdb.base/gdb1250.exp

   1 # Copyright 2003, 2007 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 2 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program; if not, write to the Free Software
  15 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  16
  17 # Tests for PR gdb/1250.
  18 # 2003-07-15  Michael Chastain <mec@shout.net>
  19
  20 # This file is part of the gdb testsuite.
  21
  22 if $tracelevel then {
  23         strace $tracelevel
  24         }
  25
  26 #
  27 # test running programs
  28 #
  29 set prms_id 0
  30 set bug_id 0
  31
  32 set testfile "gdb1250"
  33 set srcfile ${testfile}.c
  34 set binfile ${objdir}/${subdir}/${testfile}
  35
  36 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  37      untested gdb1250.exp
  38      return -1
  39 }
  40
  41 gdb_exit
  42 gdb_start
  43 gdb_reinitialize_dir $srcdir/$subdir
  44 gdb_load ${binfile}
  45
  46 if ![runto abort {allow-pending}] then {
  47     perror "couldn't run to breakpoint"
  48     continue
  49 }
  50
  51 # See http://sources.redhat.com/gdb/bugs/1250
  52 #
  53 # In a nutshell: the function 'beta' ends with a call to 'abort', which
  54 # is a noreturn function.  So the last instruction of 'beta' is a call
  55 # to 'abort'.  When gdb looks for information about the caller of
  56 # 'beta', it looks at the instruction after the call to 'abort' -- which
  57 # is the first instruction of 'alpha'!  So gdb uses the wrong frame
  58 # information.  It thinks that the test program is in 'alpha' and that
  59 # the prologue "push %ebp / mov %esp,%ebp" has not been executed yet,
  60 # and grabs the wrong values.
  61 #
  62 # By the nature of the bug, it could pass if the C compiler is not smart
  63 # enough to implement 'abort' as a noreturn function.  This is okay.
  64 # The real point is that users often put breakpoints on noreturn
  65 # functions such as 'abort' or some kind of exitting function, and those
  66 # breakpoints should work.
  67
  68 gdb_test_multiple "backtrace" "backtrace from abort" {
  69     -re "#0.*abort.*\r\n#1.*beta.*\r\n#2.*alpha.*\r\n#3.*main.*\r\n$gdb_prompt $" {
  70         pass "backtrace from abort"
  71     }
  72     -re "#0.*abort.*\r\n#1.*beta.*\r\n$gdb_prompt $" {
  73         # This happens with gdb HEAD as of 2003-07-13, with gcc 3.3,
  74         # binutils 2.14, either -gdwarf-2 or -gstabs+, on native
  75         # i686-pc-linux-gnu.
  76         #
  77         # gdb gets 'abort' and 'beta' right and then goes into the
  78         # weeds.
  79         kfail "gdb/1250" "backtrace from abort"
  80     }
  81 }