gdb/testsuite/gdb.base/restore.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2
   3 # Copyright 1998-2016 Free Software Foundation, Inc.
   4
   5 # This program 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 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program 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 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 # Test GDB's ability to restore saved registers from stack frames
  19 # when using the `return' command.
  20 #
  21 # This file was written by Jim Blandy <jimb@cygnus.com>, with
  22 # fragments borrowed from return.exp.
  23
  24 standard_testfile
  25 set executable $testfile
  26
  27 if { [prepare_for_testing $testfile.exp $executable $srcfile] } {
  28     return -1
  29 }
  30
  31 proc restore_tests { } {
  32     global gdb_prompt
  33
  34     if { ! [ runto driver ] } {
  35         return 0
  36     }
  37
  38     set limit 5
  39
  40     # For each caller function,
  41     #   call each of the callee functions,
  42     #   force a return from the callee, and
  43     #   make sure that the local variables still have the right values.
  44
  45     for {set c 1} {$c <= $limit} {incr c} {
  46
  47         # Set a breakpoint at the next caller function.
  48         gdb_test "tbreak caller$c" "Temporary breakpoint.*\[0-9\]*\\." \
  49             "tbreak caller$c"
  50
  51         # Continue to the next caller function.
  52         gdb_test "continue" " caller$c prologue .*" "run to caller$c"
  53
  54         # Do each callee function.
  55         for {set e 1} {$e <= $limit} {incr e} {
  56
  57             gdb_test "tbreak callee$e" "Temporary breakpoint.*\[0-9\]*\\." \
  58                 "caller$c calls callee$e; tbreak callee"
  59
  60             gdb_test "continue" " callee$e prologue .*/" \
  61                 "caller$c calls callee$e; continue to callee"
  62
  63             # Do a forced return from the callee.
  64             set test "caller$c calls callee$e; return callee now"
  65
  66             gdb_test "return 0" \
  67                 " caller$c .*" \
  68                 "$test" \
  69                 "Make .* return now.*y or n. $" \
  70                 "y"
  71
  72             # Check that the values of the local variables are what
  73             # they should be.
  74             for {set var 1} {$var <= $c} {incr var} {
  75                 set expected [expr 0x7eeb + $var]
  76                 gdb_test "print l$var" " = $expected" \
  77                     "caller$c calls callee$e; return restored l$var to $expected"
  78             }
  79         }
  80     }
  81
  82     gdb_continue_to_end "" continue 1
  83 }
  84
  85 set prev_timeout $timeout
  86 set timeout 30
  87 restore_tests
  88 set timeout $prev_timeout