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# Copyright (C) 2014 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# In this test we're looking at how gdb handles backtraces and
# investigating the stack depth when confronted with an "invalid" stack,
# that is a stack where the first few frames are normal, and then there's a
# frame where the stack in unreadable.
#
# One interesting bug that has been observed is that gdb will sometime
# exhibit different behaviour the first time a stack command is run
# compared to the second (and later) times a command is run. This is
# because the first time a command is run gdb actually tries to figure out
# the answer, while the second (and later) times gdb relies on the answer
# cached from the first time. As a result in this test each command is
# run twice, and we restart gdb before testing each different command to
# ensure that nothing is being cached.
set opts {}
standard_testfile .c
if { ![istarget x86_64-*-* ] || ![is_lp64_target] } {
verbose "Skipping ${testfile}."
return
}
if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} $opts] } {
return -1
}
if ![runto breakpt] {
return -1
}
# Use 'bt no-filters' here as the python filters will raise their own
# error during initialisation, the no-filters case is simpler.
gdb_test "bt no-filters" "^bt no-filters\r\n#0 +$hex in func2 \\(\\)\r\nCannot access memory at address 0x\[0-9a-f\]+" \
"first backtrace, with error message"
send_gdb "bt no-filters\n"
gdb_expect {
-re "^bt no-filters\r\n#0 +$hex in func2 \\(\\)\r\nCannot access memory at address 0x\[0-9a-f\]+\r\n$gdb_prompt $" {
# Currently gdb will not display the error message associated with
# the truncated backtrace after the first backtrace has been
# completed. Ideally, we would do this. If this case is ever hit
# then we have started to display the backtrace in all cases and
# the xpass should becomd a pass, and the previous pass case below
# should be removed, or changed to a fail.
xpass "second backtrace, with error message"
}
-re "^bt no-filters\r\n#0 +$hex in func2 \\(\\)\r\n$gdb_prompt $" {
pass "second backtrace, without error message"
}
timeout {
fail "second backtrace (timeout)"
}
}
clean_restart ${binfile}
if ![runto breakpt] {
return -1
}
set test_name "check mi -stack-info-depth command, first time"
send_gdb "interpreter-exec mi \"-stack-info-depth\"\n"
gdb_expect {
-re "\\^done,depth=\"1\"\r\n$gdb_prompt $" {
pass $test_name
}
-re "\\^error,msg=\"Cannot access memory at address $hex\"\r\n$gdb_prompt $" {
xfail $test_name
}
}
gdb_test "interpreter-exec mi \"-stack-info-depth\"" \
"\\^done,depth=\"1\"" \
"check mi -stack-info-depth command, second time"
clean_restart ${binfile}
if ![runto breakpt] {
return -1
}
set test_name "check mi -stack-list-frames command, first time"
send_gdb "interpreter-exec mi \"-stack-list-frames\"\n"
gdb_expect {
-re "\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"func2\"\}\\\]\r\n$gdb_prompt $" {
pass $test_name
}
-re "\\^error,msg=\"Cannot access memory at address $hex\"\r\n$gdb_prompt $" {
xfail $test_name
}
}
gdb_test "interpreter-exec mi \"-stack-list-frames\"" \
"\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"func2\"\}\\\]" \
"check mi -stack-list-frames command, second time"
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