Re: linux native async mode support

Nick Roberts
2008-03-22T22:06:15Z

> > (gdb) start
> > Breakpoint 1 at 0x804862c: file myprog.c, line 95.
> > Starting program: /home/nickrob/myprog
> > main (argc=1, argv=0xbfe3b904) at myprog.c:95
> > 95 main (int argc, char **argv) {
> > (gdb) maintenance set linux-async on
> > Cannot change this setting while the inferior is running.
>
> Right, gotta do it after gdb_start but before anything else.

OK. For some reason I was (mistakenly) thinking mi_gdb_start
started the inferior.

> > > and [isnative] && [istarget *-linux*] to limit
> > > it to platforms with the new command for now.
> >
> > I will do this.
>
> Thank you!

Attached below. I've added [board_info gdb_protocol] == "async" since
"target async" works after Vladimir's changes.

The tests for async output of CLI commands are really motivated by my interest
in such commands being entered from the GUD buffer in Emacs. There really
should be tests which have a general relevance to async mode, e.g., interrupt
(not documented in the manual) or -exec-interrupt but this would require a
different executable for the tests.

--
Nick http://www.inet.net.nz/~nickrob

# Copyright 2008 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#
# Test asynchronous Machine Interface (MI) operations
#

# This currently only works with native linux and the async remote protocol.
if { !([isnative] && [istarget *-linux*]) \
&& [board_info gdb_protocol] != "async" } then {
return
}

# The plan is for async mode to become the default but toggle for now.
set saved_gdbflags $GDBFLAGS
set GDBFLAGS "-ex \"maint set linux-async on\""

load_lib mi-support.exp

gdb_exit
if [mi_gdb_start] {
continue
}

set testfile "basics"
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug additional_flags=-DFAKEARGV}] != "" } {
untested mi-async.exp
return -1
}

mi_delete_breakpoints
mi_gdb_reinitialize_dir $srcdir/$subdir
mi_gdb_load ${binfile}

# mi_gdb_test cannot be used for asynchronous commands because there are
# two prompts involved and this can lead to a race condition.

proc linux_async_tests {} {
global mi_gdb_prompt
global hex

set line_main_head [gdb_get_line_number "main ("]
set line_main_body [expr $line_main_head + 2]
set line_main_next [expr $line_main_head + 3]

send_gdb "start\n"
gdb_expect {
-re ".*\\^running\r\n\\^done\r\n$mi_gdb_prompt" {
gdb_expect {
-re "\\*stopped,thread-id=\"0\",frame=\{addr=\"$hex\",func=\"main\",args=\\\[\\\],file=\".*basics.c\",line=\"$line_main_body\"\}\r\n$mi_gdb_prompt$" {
pass "Asynchronous response after start command"
}
-re ".*$mi_gdb_prompt$" {
fail "Asynchronous response after start command (2)"
}
timeout {
fail "Asynchronous response after start command (timeout 2)"
}
}
}
-re ".*$mi_gdb_prompt$" {
fail "Asynchronous response after start command (1)"
}
timeout {fail "Asynchronous response after start command (timeout 1)"}
}

send_gdb "next\n"
gdb_expect {
-re "\\^running\r\n\\^done\r\n$mi_gdb_prompt" {
gdb_expect {
-re "\\*stopped,reason=\"end-stepping-range\",thread-id=\"0\",frame=\{addr=\"$hex\",func=\"main\",args=\\\[\\\],file=\".*basics.c\",line=\"$line_main_next\"\}\r\n$mi_gdb_prompt$" {
pass "Asynchronous response after next command"
}
-re ".*$mi_gdb_prompt$" {
fail "Asynchronous response after next command (2)"
}
timeout {
fail "Asynchronous response after next command (timeout 2)"
}
}
}
-re ".*$mi_gdb_prompt$" {
fail "Asynchronous response after next command (1)"
}
timeout {fail "Asynchronous response after next command (timeout 1)"}
}

mi_gdb_test "-exec-interrupt" \
"" \
""

send_gdb "start\n"
gdb_expect {
-re ".*\\^running\r\n\\^done\r\n$mi_gdb_prompt" {
gdb_expect {
-re "\\*stopped,thread-id=\"0\",frame=\{addr=\"$hex\",func=\"main\",args=\\\[\\\],file=\".*basics.c\",line=\"$line_main_body\"\}\r\n$mi_gdb_prompt$" {
pass "Asynchronous response after (re) start"
}
-re ".*$mi_gdb_prompt$" {
fail "Asynchronous response after (re) start (2)"
}
timeout {
fail "Asynchronous response after (re) start (timeout 2)"
}
}
}
-re ".*$mi_gdb_prompt$" {
fail "Asynchronous response after (re) start (1)"
}
timeout {fail "Asynchronous response after (re) start (timeout 1)"}
}
}

#if [istarget "i386-*-linux-gnu"] then {
linux_async_tests
#}

mi_gdb_exit

set GDBFLAGS $saved_gdbflags

return 0