gdb/testsuite/gdb.base/restore.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2
   3 # Copyright 1998-2002, 2004, 2007-2012 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
  25 set testfile "restore"
  26 set srcfile ${testfile}.c
  27 set binfile ${objdir}/${subdir}/${testfile}
  28 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  29     untested restore.exp
  30     return -1
  31 }
  32
  33 proc restore_tests { } {
  34     global gdb_prompt
  35
  36     if { ! [ runto driver ] } {
  37         return 0
  38     }
  39
  40     set limit 5
  41
  42     # For each caller function,
  43     #   call each of the callee functions,
  44     #   force a return from the callee, and
  45     #   make sure that the local variables still have the right values.
  46
  47     for {set c 1} {$c <= $limit} {incr c} {
  48
  49         # Set a breakpoint at the next caller function.
  50         gdb_test "tbreak caller$c" "Temporary breakpoint.*\[0-9\]*\\." \
  51             "tbreak caller$c"
  52
  53         # Continue to the next caller function.
  54         gdb_test "continue" " caller$c prologue .*" "run to caller$c"
  55
  56         # Do each callee function.
  57         for {set e 1} {$e <= $limit} {incr e} {
  58
  59             gdb_test "tbreak callee$e" "Temporary breakpoint.*\[0-9\]*\\." \
  60                 "caller$c calls callee$e; tbreak callee"
  61
  62             gdb_test "continue" " callee$e prologue .*/" \
  63                 "caller$c calls callee$e; continue to callee"
  64
  65             # Do a forced return from the callee.
  66             set test "caller$c calls callee$e; return callee now"
  67
  68             gdb_test "return 0" \
  69                 " caller$c .*" \
  70                 "$test" \
  71                 "Make .* return now.*y or n. $" \
  72                 "y"
  73
  74             # Check that the values of the local variables are what
  75             # they should be.
  76             for {set var 1} {$var <= $c} {incr var} {
  77                 set expected [expr 0x7eeb + $var]
  78                 gdb_test "print l$var" " = $expected" \
  79                     "caller$c calls callee$e; return restored l$var to $expected"
  80             }
  81         }
  82     }
  83
  84     if ![gdb_skip_stdio_test "run to completion"] {
  85         send_gdb "continue\n"
  86
  87         gdb_expect {
  88             -re "exiting" {
  89                 pass "run to completion"
  90             }
  91             timeout {
  92                 fail "(timeout) run to completion"
  93             }
  94         }
  95     } else {
  96         gdb_test "continue" ".*" ""
  97     }
  98 }
  99
 100
 101
 102 # Start with a fresh gdb.
 103
 104 gdb_exit
 105 gdb_start
 106 gdb_reinitialize_dir $srcdir/$subdir
 107 gdb_load ${binfile}
 108
 109 set prev_timeout $timeout
 110 set timeout 30
 111 restore_tests
 112 set timeout $prev_timeout