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# Copyright (C) 2015-2023 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/>.
# This test verifies that several threads forking while another thread
# is constantly stepping over a breakpoint is properly handled.
standard_testfile
set linenum [gdb_get_line_number "set break here"]
if {[build_executable "failed to prepare" $testfile $srcfile {debug pthreads}] == -1} {
return -1
}
# Assume yes.
set displaced_stepping_supported 1
# "set displaced on" only tells gdb to use displaced stepping if
# possible. Probe for actual support.
proc probe_displaced_stepping_support {} {
global displaced_stepping_supported
global binfile gdb_prompt
with_test_prefix "probe displaced-stepping support" {
clean_restart $binfile
gdb_test_no_output "set displaced on"
if {![runto_main]} {
return 0
}
# We're stopped at the main breakpoint. If displaced stepping is
# supported, we'll see related debug output while we step past
# that breakpoint.
gdb_test_no_output "set debug displaced 1"
gdb_test_multiple "next" "probe" {
-re "prepared successfully .*$gdb_prompt $" {
pass "supported"
}
-re ".*$gdb_prompt $" {
set displaced_stepping_supported 0
pass "not supported"
}
}
}
}
# The test proper. If COND_BP_TARGET is true, then test with
# conditional breakpoints evaluated on the target side, if possible.
# DETACH_ON_FORK is used as value for the "set detach-on-fork"
# setting. If "on", this exercises GDB explicitly continuing the fork
# child until exit. If "off", this exercises GDB detaching the fork
# child. DISPLACED indicates whether to use displaced stepping or
# not.
proc do_test { cond_bp_target detach_on_fork displaced } {
global GDBFLAGS
global srcfile testfile binfile
global decimal gdb_prompt
global linenum
global is_remote_target
set saved_gdbflags $GDBFLAGS
set GDBFLAGS [concat $GDBFLAGS " -ex \"set non-stop on\""]
clean_restart $binfile
set GDBFLAGS $saved_gdbflags
if {![runto_main]} {
return 0
}
if {$cond_bp_target} {
set test "set breakpoint condition-evaluation target"
gdb_test_multiple $test $test {
-re "warning: Target does not support breakpoint condition evaluation.\r\nUsing host evaluation mode instead.\r\n$gdb_prompt $" {
# Target doesn't support breakpoint condition
# evaluation on its side. Skip the test.
return 0
}
-re "^$test\r\n$gdb_prompt $" {
}
}
} else {
gdb_test_no_output "set breakpoint condition-evaluation host"
}
gdb_test_no_output "set detach-on-fork $detach_on_fork"
gdb_test_no_output "set displaced $displaced"
gdb_test "break $linenum if zero == 1" \
"Breakpoint .*" \
"set breakpoint that evals false"
set test "continue &"
gdb_test_multiple $test $test {
-re "$gdb_prompt " {
pass $test
}
}
set fork_count 0
set ok 0
with_timeout_factor 10 {
set test "inferior 1 exited"
gdb_test_multiple "" $test {
-re "Inferior 1 \(\[^\r\n\]+\) exited normally" {
set ok 1
pass $test
}
-re "Inferior $decimal \(\[^\r\n\]+\) exited normally" {
incr fork_count
if {$fork_count <= 100} {
exp_continue
} else {
fail "$test (too many forks)"
}
}
}
}
if {!$ok} {
# No use testing further.
return
}
gdb_test "info threads" "No threads\." \
"no threads left"
gdb_test "info inferiors" \
"Num\[ \t\]+Description\[ \t\]+Connection\[ \t\]+Executable\[ \t\]+\r\n\\* 1 \[^\r\n\]+" \
"only inferior 1 left"
}
probe_displaced_stepping_support
foreach_with_prefix cond_bp_target {1 0} {
foreach_with_prefix detach_on_fork {"on" "off"} {
# Disable "off" for now. The test does pass with
# detach-on-fork off (at the time of writing), but gdb seems
# to slow down quadratically as inferiors are created, and
# then the test takes annoyingly long to complete...
if {$detach_on_fork == "off"} {
continue
}
foreach_with_prefix displaced {"on" "off"} {
if {$displaced == "on" && !$displaced_stepping_supported} {
continue
}
do_test $cond_bp_target $detach_on_fork $displaced
}
}
}
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