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- # Copyright 2022 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/>.
- # Test doing a "next" on a thread during which forks or vforks happen in other
- # threads.
- standard_testfile
- # Line where to stop the main thread.
- set break_here_line [gdb_get_line_number "break here"]
- # Build executables, one for each fork flavor.
- foreach_with_prefix fork_func {fork vfork} {
- set opts [list debug pthreads additional_flags=-DFORK_FUNC=${fork_func}]
- if { [build_executable "failed to prepare" \
- ${testfile}-${fork_func} ${srcfile} $opts] } {
- return
- }
- }
- # If testing against GDBserver, consume all it its output.
- proc drain_gdbserver_output { } {
- if { [info exists ::server_spawn_id] } {
- gdb_test_multiple "" "" {
- -i "$::server_spawn_id"
- -timeout 0
- -re ".+" {
- exp_continue
- }
- }
- }
- }
- # Run the test with the given parameters:
- #
- # - FORK_FUNC: fork flavor, "fork" or "vfork".
- # - TARGET-NON-STOP: "maintenance set target-non-stop" value, "auto", "on" or
- # "off".
- # - NON-STOP: "set non-stop" value, "on" or "off".
- # - DISPLACED-STEPPING: "set displaced-stepping" value, "auto", "on" or "off".
- proc do_test { fork_func target-non-stop non-stop displaced-stepping } {
- save_vars { ::GDBFLAGS } {
- append ::GDBFLAGS " -ex \"maintenance set target-non-stop ${target-non-stop}\""
- append ::GDBFLAGS " -ex \"set non-stop ${non-stop}\""
- clean_restart ${::binfile}-${fork_func}
- }
- gdb_test_no_output "set displaced-stepping ${displaced-stepping}"
- if { ![runto_main] } {
- return
- }
- # The "Detached after (v)fork" messages get in the way in non-stop, disable
- # them.
- gdb_test_no_output "set print inferior-events off"
- # Advance the next-ing thread to the point where we'll execute the nexts.
- # Leave the breakpoint in: it will force GDB to step over it while next-ing,
- # which exercises some additional code paths.
- gdb_test "break $::break_here_line" "Breakpoint $::decimal at $::hex.*"
- gdb_test "continue" "hit Breakpoint $::decimal, main.*"
- # Next an arbitrary number of times over the lines of the loop.
- #
- # It is useful to bump this number to a larger value (e.g. 200) to stress
- # test more, but it makes the test case run for considerably longer. If
- # you increase the number of loops, you might want to adjust the alarm
- # time in the .c file accordingly.
- for { set i 0 } { $i < 20 } { incr i } {
- # If testing against GDBserver, the forking threads cause a lot of
- # "Detaching from process XYZ" messages to appear. If we don't consume
- # that output, GDBserver eventually blocks on a full stderr. Drain it
- # once every loop. It may not be needed for 20 iterations, but it's
- # needed if you increase to 200 iterations.
- drain_gdbserver_output
- with_test_prefix "i=$i" {
- if { [gdb_test "next" "other line.*" "next to other line"] != 0 } {
- return
- }
- if { [gdb_test "next" "for loop.*" "next to for loop"] != 0 } {
- return
- }
- if { [gdb_test "next" "break here.*" "next to break here"] != 0} {
- return
- }
- }
- }
- }
- foreach_with_prefix fork_func {fork vfork} {
- foreach_with_prefix target-non-stop {auto on off} {
- foreach_with_prefix non-stop {off on} {
- foreach_with_prefix displaced-stepping {auto on off} {
- do_test ${fork_func} ${target-non-stop} ${non-stop} ${displaced-stepping}
- }
- }
- }
- }
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