gdb/testsuite/gdb.arch/amd64-invalid-stack-top.exp

   1 # Copyright (C) 2014-2017 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 3 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, see <http://www.gnu.org/licenses/>.
  15
  16 # In this test we're looking at how gdb handles backtraces and
  17 # investigating the stack depth when confronted with an "invalid" stack,
  18 # that is a stack where the first few frames are normal, and then there's a
  19 # frame where the stack in unreadable.
  20 #
  21 # One interesting bug that has been observed is that gdb will sometime
  22 # exhibit different behaviour the first time a stack command is run
  23 # compared to the second (and later) times a command is run.  This is
  24 # because the first time a command is run gdb actually tries to figure out
  25 # the answer, while the second (and later) times gdb relies on the answer
  26 # cached from the first time.  As a result in this test each command is
  27 # run twice, and we restart gdb before testing each different command to
  28 # ensure that nothing is being cached.
  29
  30 set opts {}
  31 standard_testfile .c
  32
  33 if { ![istarget x86_64-*-* ] || ![is_lp64_target] } {
  34     verbose "Skipping ${testfile}."
  35     return
  36 }
  37 if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} $opts] } {
  38     return -1
  39 }
  40
  41 if ![runto breakpt] {
  42     return -1
  43 }
  44
  45 # Use 'bt no-filters' here as the python filters will raise their own
  46 # error during initialisation, the no-filters case is simpler.
  47
  48 gdb_test "bt no-filters" "^bt no-filters\r\n#0 +$hex in func2 \\(\\)\r\nBacktrace stopped: Cannot access memory at address 0x\[0-9a-f\]+" \
  49          "first backtrace, with error message"
  50
  51 gdb_test "bt no-filters" "^bt no-filters\r\n#0 +$hex in func2 \\(\\)\r\nBacktrace stopped: Cannot access memory at address 0x\[0-9a-f\]+" \
  52          "second backtrace, with error message"
  53
  54 clean_restart ${binfile}
  55
  56 if ![runto breakpt] {
  57     return -1
  58 }
  59
  60 gdb_test "interpreter-exec mi \"-stack-info-depth\"" \
  61     "\\^done,depth=\"1\"" \
  62     "check mi -stack-info-depth command, first time"
  63
  64 gdb_test "interpreter-exec mi \"-stack-info-depth\"" \
  65     "\\^done,depth=\"1\"" \
  66     "check mi -stack-info-depth command, second time"
  67
  68 clean_restart ${binfile}
  69
  70 if ![runto breakpt] {
  71     return -1
  72 }
  73
  74 gdb_test "interpreter-exec mi \"-stack-list-frames\"" \
  75     "\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"func2\"\}\\\]" \
  76     "check mi -stack-list-frames command, first time"
  77
  78 gdb_test "interpreter-exec mi \"-stack-list-frames\"" \
  79     "\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"func2\"\}\\\]" \
  80     "check mi -stack-list-frames command, second time"