# Copyright 2009-2020 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/>.

# Generic subroutines for handling valgrind vgdb server.

#
# Start a vgdb server, and connect gdb to it.  Return 0 on success, and -1 on
# error.
#
proc vgdb_start { {active_at_startup 1} } {
    global binfile use_gdb_stub board testfile
    global valgrind_spawn_id gdb_spawn_id
    global decimal

    set test "spawn valgrind"
    set cmd_list [list]
    lappend cmd_list "valgrind"
    if { $active_at_startup } {
	lappend cmd_list "--vgdb-error=0"
    }
    lappend cmd_list $binfile
    set cmd [join $cmd_list]
    set res [remote_spawn host $cmd]
    if { $res < 0 || $res == "" } {
	verbose -log "Spawning $cmd failed."
	unsupported $test
	return -1
    }
    pass $test
    # Declare GDB now as running.
    set gdb_spawn_id $res

    # GDB started by vgdb stops already after the startup is executed, like with
    # non-extended gdbserver.  It is also not correct to run/attach the inferior.
    set use_gdb_stub 1

    set test "valgrind started"
    # The trailing '.' differs for different memcheck versions.
    gdb_test_multiple "" $test {
	-re "==($decimal)== Memcheck, a memory error detector\\.?\r\n" {
	    set vgdbpid $expect_out(1,string)
	    pass $test
	}
	-re "valgrind: failed to start tool 'memcheck' for platform '.*': No such file or directory" {
	    unsupported $test
	    return -1
	}
	-re "valgrind: wrong ELF executable class" {
	    unsupported $test
	    return -1
	}
	-re "command not found" {
	    # The spawn succeeded, but then valgrind was not found - e.g. if
	    # we spawned SSH to a remote system.
	    unsupported $test
	    return -1
	}
	-re "valgrind: Bad option.*--vgdb-error=0" {
	    # valgrind is not >= 3.7.0.
	    unsupported $test
	    return -1
	}
    }

    # Do not kill valgrind.
    set valgrind_spawn_id [board_info host fileid]
    unset gdb_spawn_id
    set board [host_info name]
    unset_board_info fileid

    clean_restart $testfile

    # Make sure we're disconnected, in case we're testing with the
    # native-extended-gdbserver board, where gdb_start/gdb_load spawn
    # gdbserver and connect to it.
    gdb_test "disconnect" ".*"

    set vgdbcmd "target remote | vgdb --pid=$vgdbpid"
    if { $active_at_startup } {
	gdb_test "$vgdbcmd" " in \\.?_start .*" "target remote for vgdb"
    } else {
	# Let $binfile run a bit before attaching.  This is a bit of a hack,
	# in that it lets test-case valgrind-infcall-2.exp run to the point of
	# nanosleep, which seems to be required to trigger the error condition.
	# So, without this, we hit
	# "UNSUPPORTED: gdb.base/valgrind-infcall-2.exp: do printf".
	exec sleep 1

	# Connect to vgdb.  Don't expect to be anywhere in particular.
	gdb_test "$vgdbcmd" "" "target remote for vgdb"
    }

    gdb_test "monitor v.set gdb_output" "valgrind output will go to gdb.*"
    return 0
}

#
# Stop vgdb server.
#
proc vgdb_stop { } {
    global valgrind_spawn_id

    # Only if valgrind got stuck.
    kill_wait_spawned_process $valgrind_spawn_id
}