gdb/testsuite/gdb.base/restore.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2
   3 # Copyright 1998-2022 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 "failed to prepare" $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
  50         # Continue to the next caller function.
  51         gdb_test "continue" " caller$c prologue .*" "run to caller$c"
  52
  53         # Do each callee function.
  54         for {set e 1} {$e <= $limit} {incr e} {
  55
  56             gdb_test "tbreak callee$e" "Temporary breakpoint.*\[0-9\]*\\." \
  57                 "caller$c calls callee$e; tbreak callee"
  58
  59             gdb_test "continue" " callee$e prologue .*/" \
  60                 "caller$c calls callee$e; continue to callee"
  61
  62             # Do a forced return from the callee.
  63             set test "caller$c calls callee$e; return callee now"
  64
  65             gdb_test "return 0" \
  66                 " caller$c .*" \
  67                 "$test" \
  68                 "Make .* return now.*y or n. $" \
  69                 "y"
  70
  71             # Check that the values of the local variables are what
  72             # they should be.
  73             for {set var 1} {$var <= $c} {incr var} {
  74                 set expected [expr 0x7eeb + $var]
  75                 set test "caller$c calls callee$e; return restored l$var to $expected"
  76                 set pass_pattern " = $expected"
  77                 set unsupported_pattern " = <optimized out>"
  78                 gdb_test_multiple "print l$var" $test {
  79                     -re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
  80                         pass $test
  81                     }
  82                     -re "\[\r\n\]*(?:$unsupported_pattern)\[\r\n\]+$gdb_prompt $" {
  83                         unsupported $test
  84                     }
  85                 }
  86             }
  87         }
  88     }
  89
  90     gdb_continue_to_end "" continue 1
  91 }
  92
  93 set prev_timeout $timeout
  94 set timeout 30
  95 restore_tests
  96 set timeout $prev_timeout
  97
  98 # Test PR cli/23785
  99 clean_restart $binfile
 100 if { ![runto_main] } {
 101     return -1
 102 }
 103 gdb_test "restore non-existent-file binary" \
 104     "Failed to open non-existent-file: .*"