# Copyright 2015-2020 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/>.

# Test that GDB doesn't get badly wedged if the inferior is killed
# from outside GDB (with SIGKILL) while the program is stopped.

standard_testfile

# Get the value of variable VAR in the inferior.  MSG is used as the
# test message.

proc get_value {var msg} {
    global expect_out
    global gdb_prompt
    global decimal

    set value -1
    gdb_test_multiple "print $var" "$msg" {
	-re ".*= ($decimal).*\r\n$gdb_prompt $" {
	    set value $expect_out(1,string)
	    pass "$msg"
        }
    }
    return ${value}
}

# Runs the program until a breakpoint, deletes all breakpoints, and
# then kills the inferior from _outside_ GDB, with SIGKILL.  Runs CMDS
# afterwards, to make sure GDB copes with the inferior disappearing,
# and then quits GDB.

proc test {cmds_after_kill} {
    global binfile
    global gdb_prompt
    global decimal

    clean_restart ${binfile}

    if ![runto done] {
	return
    }

    # So that "continue" doesn't try a step over, etc.
    delete_breakpoints

    set testpid [get_value "pid" "get pid of inferior"]
    if { $testpid == -1 } {
	return -1
    }

    remote_exec target "kill -9 ${testpid}"

    # Give it some time to die.
    sleep 2

    uplevel 1 $cmds_after_kill

    # Make sure we can quit.
    set msg "quit GDB"
    gdb_test_multiple "quit" $msg {
	-re "Quit anyway\\? \\(y or n\\) $" {
	    send_gdb "y\n"
	    exp_continue
	}
	eof {
	    pass $msg
	}
    }
}

if {[prepare_for_testing "failed to prepare" $testfile $srcfile] == -1} {
    return -1
}

# The actual output GDB prints in response to commands after the
# inferior is gone isn't very well defined, and will depend on target.
# What we're trying to make sure is that GDB doesn't internal error or
# get wedged.

# Try simply continuing.
with_test_prefix "continue" {
    test {
	# Try stepping the program.  Stepping may need to read/write
	# registers, unlike continue.
	gdb_test "continue" ".*"

	# Try listing threads afterwards.  It's probably what the user
	# will do after an error.
	gdb_test "info threads" ".*"
    }
}

# Try stepping the program.  Stepping may go through diferent code
# paths in the target backends.
with_test_prefix "stepi" {
    test {
	gdb_test "si" ".*"
	gdb_test "info threads" ".*"
    }
}

# Try fetching registers explicitly, which should cover the error many
# other commands would trigger.
with_test_prefix "registers" {
    test {
	gdb_test "flushregs" ".*"
	gdb_test "info threads" ".*"
    }
}

# Try only listing threads explicitly, first thing, which is another
# operation GDB may or not decide to do itself and is likely to be
# what a user would try after error too.
with_test_prefix "info threads" {
    test {
	gdb_test "info threads" ".*"
    }
}