1# Copyright (C) 2014-2023 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 30set opts {} 31standard_testfile .c 32 33if { ![istarget x86_64-*-* ] || ![is_lp64_target] } { 34 verbose "Skipping ${testfile}." 35 return 36} 37if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} $opts] } { 38 return -1 39} 40 41if ![runto breakpt] { 42 return -1 43} 44 45# Use 'bt no-filters' here as the python filters will raise their own 46# error during initialisation, the no-filters case is simpler. 47 48gdb_test "bt no-filters" "^bt no-filters\r\n#0 +$hex in func2 \\(\\)\r\nBacktrace stopped: Cannot access memory at address 0x\[0-9a-f\]+" \ 49 "first backtrace, with error message" 50 51gdb_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 54clean_restart ${binfile} 55 56if ![runto breakpt] { 57 return -1 58} 59 60gdb_test "interpreter-exec mi \"-stack-info-depth\"" \ 61 "\\^done,depth=\"1\"" \ 62 "check mi -stack-info-depth command, first time" 63 64gdb_test "interpreter-exec mi \"-stack-info-depth\"" \ 65 "\\^done,depth=\"1\"" \ 66 "check mi -stack-info-depth command, second time" 67 68clean_restart ${binfile} 69 70if ![runto breakpt] { 71 return -1 72} 73 74gdb_test "interpreter-exec mi \"-stack-list-frames\"" \ 75 "\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"func2\"(,arch=\"\[^\"\]+\")?\}\\\]" \ 76 "check mi -stack-list-frames command, first time" 77 78gdb_test "interpreter-exec mi \"-stack-list-frames\"" \ 79 "\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"func2\"(,arch=\"\[^\"\]+\")?\}\\\]" \ 80 "check mi -stack-list-frames command, second time" 81