# This testcase is part of GDB, the GNU debugger.
#
# Copyright 2013-2024 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/>.

# Check that GDB handles GDBserver disconnecting abruptly, in several
# scenarios.

load_lib gdbserver-support.exp

standard_testfile

require allow_gdbserver_tests

if { [build_executable "failed to prepare" ${testfile}] } {
    return -1
}

# Spawn GDBserver, run to main, extract GDBserver's PID and save it in
# the SERVER_PID global.

proc prepare {} {
    global binfile gdb_prompt srcfile decimal
    global server_pid
    global GDBFLAGS

    save_vars { GDBFLAGS } {
	# If GDB and GDBserver are both running locally, set the sysroot to avoid
	# reading files via the remote protocol.
	if { ![is_remote host] && ![is_remote target] } {
	    set GDBFLAGS "$GDBFLAGS -ex \"set sysroot\""
	}

	clean_restart $binfile
    }

    # Make sure we're disconnected, in case we're testing with an
    # extended-remote board, therefore already connected.
    gdb_test "disconnect" ".*"

    gdbserver_run ""

    gdb_breakpoint ${srcfile}:[gdb_get_line_number "i = 0;"]
    gdb_continue_to_breakpoint "after server_pid assignment"

    # Get the pid of GDBServer.
    set server_pid 0
    gdb_test_multiple "p server_pid" "" {
	-re -wrap " = ($decimal)" {
	    set server_pid $expect_out(1,string)
	    pass $gdb_test_name
	}
    }

    if {$server_pid == 0} {
	return 0
    }

    return 1
}

# Kill GDBserver using the PID saved by prepare.

proc kill_server {} {
    global server_pid

    remote_exec target "kill -9 $server_pid"
}

# Test issuing "tstatus" right after the connection is dropped.

proc_with_prefix test_tstatus {} {
    if ![prepare] {
	return
    }

    kill_server

    # Enable trace status packet which is disabled after the
    # connection if the remote target doesn't support tracepoint at
    # all.  Otherwise, no RSP packet is sent out.
    gdb_test \
	"set remote trace-status-packet on" \
	"Support for the 'qTStatus' packet on the current remote target is set to \"on\"."

    # Force GDB to talk with GDBserver, so that we can get the
    # "connection closed" error.
    gdb_test "tstatus" {Remote connection closed|Remote communication error\.  Target disconnected: Connection reset by peer\.}
}

# Test unwinding with no debug/unwind info, right after the connection
# is dropped.

proc_with_prefix test_unwind_nosyms {} {
    if ![prepare] {
	return
    }

    # Remove symbols, so that we try to unwind with one of the
    # heuristic unwinders, and read memory from within its sniffer.
    gdb_unload

    kill_server

    gdb_test "bt" "(Target disconnected|Remote connection closed|Remote communication error).*"
}

# Test unwinding with debug/unwind info, right after the connection is
# dropped.

proc_with_prefix test_unwind_syms {} {
    if ![prepare] {
	return
    }

    kill_server

    gdb_test "bt" "(Target disconnected|Remote connection closed|Remote communication error).*"
}

# Test performing a stepi right after the connection is dropped.

proc_with_prefix test_stepi {} {
    if ![prepare] {
	return
    }

    # Ensure GDB has computed the frame-id for the current frame
    # before we kill the gdbserver.  With the frame-id cached when we
    # stepi below the first packets we try to send to gdbserver will
    # be from within the breakpoint insertion process.
    gdb_test "info frame" "Stack level 0, .*"

    kill_server

    gdb_test "stepi" "(Target disconnected|Remote connection closed|Remote communication error).*"
}

test_tstatus
test_unwind_nosyms
test_unwind_syms
test_stepi