testsuite/gdb.base/foll-exec-mode.exp

#    Copyright 1997-2019 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/>.

# This is a test of gdb's follow-exec-mode.
#
# It first checks that exec events are supported by using a catchpoint,
# then tests multiple scenarios for follow-exec-mode using parameters
# that test:
# - each mode
# - different commands to execute past the exec
# - re-running both the original and new inferiors.
#
# Note that we can't single-step past an exec call.  There has to
# be a breakpoint in order to stop after the exec, even if we use
# a single-step command to execute past the exec.

# Remote mode doesn't support the 'run' command, which is
# required for follow-exec-mode testing.
if { [target_info exists gdb_protocol]
     && [target_info gdb_protocol] == "remote" } {
    continue
}

# Until "catch exec" is implemented on other targets...
#
if {![istarget "*-linux*"]} then {
     continue
}

standard_testfile foll-exec-mode.c

set testfile2 "execd-prog"
set srcfile2 ${testfile2}.c
set binfile2 [standard_output_file ${testfile2}]

set compile_options debug

# build the first test case
if  { [gdb_compile "${srcdir}/${subdir}/${srcfile2}" "${binfile2}" executable $compile_options] != "" } {
      untested "failed to compile"
      return -1
}

if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable $compile_options] != "" } {
      untested "failed to compile"
      return -1
}

#  Test exec catchpoints to ensure exec events are supported.
#
proc do_catch_exec_test { } {
    global testfile
    global gdb_prompt

    clean_restart $testfile

    # Start the program running, and stop at main.
    #
    if ![runto_main] then {
	fail "couldn't run ${testfile}"
	return
    }

    # Verify that the system supports "catch exec".
    gdb_test "catch exec" "Catchpoint \[0-9\]* \\(exec\\)" "insert first exec catchpoint"
    set has_exec_catchpoints 0
    gdb_test_multiple "continue" "continue to first exec catchpoint" {
	-re ".*Your system does not support this type\r\nof catchpoint.*$gdb_prompt $" {
	    unsupported "continue to first exec catchpoint"
	}
	-re ".*Catchpoint.*$gdb_prompt $" {
	    set has_exec_catchpoints 1
	    pass "continue to first exec catchpoint"
	}
    }

    if {$has_exec_catchpoints == 0} {
	unsupported "exec catchpoints"
	return
    }
}

# Test follow-exec-mode in the specified scenario.
# MODE determines whether follow-exec-mode is "same" or "new".
# CMD determines the command used to execute past the exec call.
# INFSWITCH is ignored for MODE == "same", and for "new" it is
# used to determine whether to switch to the original inferior
# before re-running.

proc do_follow_exec_mode_tests { mode cmd infswitch } {
    global binfile srcfile srcfile2 testfile testfile2
    global gdb_prompt

    with_test_prefix "$mode,$cmd,$infswitch" {
	clean_restart $testfile

	# Start the program running, and stop at main.
	#
	if ![runto_main] then {
	    fail "couldn't run ${testfile}"
	    return
	}

	# Set the follow-exec mode.
	#
	gdb_test_no_output "set follow-exec-mode $mode"

	# Run to the line of the exec call.
	#
	gdb_breakpoint [gdb_get_line_number "Set breakpoint here"]
	gdb_continue_to_breakpoint "continue to line of exec call"

	# Set up the output we expect to see after we execute past the exec.
	#
	set execd_line [gdb_get_line_number "after-exec" $srcfile2]
	set expected_re ".*xecuting new program: .*${testfile2}.*Breakpoint .,.*${srcfile2}:${execd_line}.*$gdb_prompt $"

	# Set a breakpoint after the exec call if we aren't single-stepping
	# past it.
	#
	if {$cmd == "continue"} {
	    gdb_breakpoint "$execd_line"
	}

	# Execute past the exec call.
	#
	set test "$cmd past exec"
	gdb_test_multiple $cmd $test {
	    -re "$expected_re" {
		pass $test
	    }
	}

	# Set expected output, given the test parameters.
	#
	if {$mode == "same"} {
	    set expected_re "\\* 1.*process.*"
	} else {
	    set expected_re "  1.*null.*$testfile.*\r\n\\* 2.*process.*$testfile2 .*"
	}

	# Check that the inferior list is correct:
	# - one inferior for MODE == "same"
	# - two inferiors for MODE == "new", current is execd program
	#
	gdb_test "info inferiors" $expected_re "Check inferior list"

	set expected_inf ""
	if {$mode == "same"} {
	    # One inferior, the execd program.
	    set expected_inf $testfile2
	} elseif {$infswitch == "infswitch"} {
	    # Two inferiors, we have switched to the original program.
	    set expected_inf $testfile
	    gdb_test "inferior 1" "Switching to inferior 1.*$testfile.*" "switch inferiors"
	} else {
	    # Two inferiors, run the execd program
	    set expected_inf $testfile2
	}

	# Now check that a 'run' command will run the correct inferior.
	#
	set test "use correct executable ($expected_inf) for run after follow exec"
	gdb_run_cmd
	gdb_test_multiple "" $test {
	    -re {Start it from the beginning\? \(y or n\) $} {
		send_gdb "y\n"
		exp_continue
	    }
	    -re "Starting program: .*$expected_inf.*Breakpoint .,.*\r\n$gdb_prompt $" {
		pass $test
	    }
	}
    }
}

do_catch_exec_test

foreach cmd {"next" "continue"} {
    foreach mode {"same" "new"} {
	# Test basic follow-exec-mode.
	do_follow_exec_mode_tests $mode $cmd "no_infswitch"
	if {$mode == "new"} {
	    # Test that when we do 'run' we get the correct executable.
	    do_follow_exec_mode_tests $mode $cmd "infswitch"
	}
    }
}

return 0