# Copyright 2008-2021 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 file is part of the GDB testsuite.  It tests reverse stepping.
# Lots of code borrowed from "step-test.exp".

#
# Test step and next in reverse
#

if ![supports_reverse] {
    return
}

standard_testfile

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

runto_main

if [supports_process_record] {
    # Activate process record/replay
    gdb_test_no_output "record" "turn on process record"
}

# plain vanilla step/next (no count)

gdb_test "next" ".*NEXT TEST 1.*" "next test 1"
gdb_test "step" ".*STEP TEST 1.*" "step test 1"

# step/next with count

gdb_test "next 2" ".*NEXT TEST 2.*" "next test 2"
gdb_test "step 3" ".*STEP TEST 2.*" "step test 2"

# step over call

gdb_test "step" ".*NEXT OVER THIS CALL.*" "step up to call"
gdb_test "next" ".*STEP INTO THIS CALL.*" "next over call"

# step into call

gdb_test "step" ".*ARRIVED IN CALLEE.*" "step into call"

# finish out of call

set test_message "finish out of fn call"
gdb_test_multiple "finish" "$test_message" {
    -re "FINISH TEST.*$gdb_prompt $" {
	pass "$test_message"
    }
    -re "STEP INTO THIS CALL.*$gdb_prompt $" {
	send_gdb "step\n"
	exp_continue
    }
}

# stepi over flat code (no calls)

set test_message "simple stepi"
gdb_test_multiple "stepi" "$test_message" {
    -re "STEPI TEST.*$gdb_prompt $" {
	pass "$test_message"
    }
    -re "FINISH TEST.*$gdb_prompt $" {
	send_gdb "stepi\n"
	exp_continue
    }
    -re "NEXTI TEST.*$gdb_prompt $" {
	fail "$test_message (too far)"
    }
}

# stepi into a function call

set test_message "stepi into function call"
gdb_test_multiple "stepi" "$test_message" {
    -re "ARRIVED IN CALLEE.*$gdb_prompt $" {
	pass "$test_message"
    }
    -re "NEXTI TEST.*$gdb_prompt $" {
	fail "$test_message (too far)"
    }
    -re "RETURN FROM CALLEE.*$gdb_prompt $" {
	fail "$test_message (too far)"
    }
    -re "ENTER CALLEE.*$gdb_prompt $" {
	send_gdb "stepi\n"
	exp_continue
    }
    -re "STEPI TEST.*$gdb_prompt $" {
	send_gdb "stepi\n"
	exp_continue
    }
}

# stepi thru return of a function call

set test_message "stepi back from function call"
gdb_test_multiple "stepi" "$test_message" {
    -re "NEXTI TEST.*$gdb_prompt $" {
	pass "$test_message"
    }
    -re "ARRIVED IN CALLEE.*$gdb_prompt $" {
	send_gdb "stepi\n"
	exp_continue
    }
    -re "RETURN FROM CALLEE.*$gdb_prompt $" {
	send_gdb "stepi\n"
	exp_continue
    }
    -re "STEPI TEST.*$gdb_prompt $" {
	send_gdb "stepi\n"
	exp_continue
    }
    -re "ENTER CALLEE.*$gdb_prompt $" {
	fail "$test_message (too far)"
    }
}

###
###
###

# Set reverse execution direction

gdb_test_no_output "set exec-dir reverse" "set reverse execution"

# stepi backward thru return and into a function

set stepi_location  [gdb_get_line_number "ARRIVED IN CALLEE" "$srcfile"]
set test_message "reverse stepi thru function return"
gdb_test_multiple "stepi" "$test_message" {
    -re "NEXTI TEST.*$gdb_prompt $" {
	fail "$test_message (start statement)"
    }
    -re "RETURN FROM CALLEE.*$gdb_prompt $" {
	send_gdb "stepi\n"
	exp_continue
    }
    -re "$hex\[ \t\]*$stepi_location.*ARRIVED IN CALLEE.*$gdb_prompt $" {
	send_gdb "stepi\n"
	exp_continue
    }
    -re "ARRIVED IN CALLEE.*$gdb_prompt $" {
	pass "$test_message"
    }
    -re "ENTER CALLEE.*$gdb_prompt $" {
	fail "$test_message (too far)"
    }
    -re "STEPI TEST.*$gdb_prompt $" {
	fail "$test_message (too far)"
    }
}

# stepi backward out of a function call

set stepi_location  [gdb_get_line_number "STEPI TEST" "$srcfile"]
set test_message "reverse stepi from a function call"
gdb_test_multiple "stepi" "$test_message" {
    -re "ARRIVED IN CALLEE.*$gdb_prompt $" {
	fail "$test_message (start statement)"
    }
    -re "ENTER CALLEE.*$gdb_prompt $" {
	send_gdb "stepi\n" 
	exp_continue
    }
    -re "${hex} in main .*:$stepi_location.*STEPI TEST.*$gdb_prompt $" {
	send_gdb "stepi\n"
	exp_continue
    }
    -re "STEPI TEST.*$gdb_prompt $" {
	pass "$test_message"
    }
    -re "STEP INTO THIS CALL.*$gdb_prompt $" {
	fail "$test_message (too far)"
    }
}

# stepi backward over flat code (no calls)

set stepi_location  [gdb_get_line_number "FINISH TEST" "$srcfile"]
set test_message "simple reverse stepi"
gdb_test_multiple "stepi" "$test_message" {
    -re "STEPI TEST.*$gdb_prompt $" {
	fail "$test_message (start statement)"
    }
    -re "$hex\[ \t\]*$stepi_location.* FINISH TEST.*$gdb_prompt $" {
	send_gdb "stepi\n"
	exp_continue
    }
    -re "$stepi_location.* FINISH TEST.*$gdb_prompt $" {
	pass "$test_message"
    }
    -re "STEP INTO THIS CALL.*$gdb_prompt $" {
	fail "$test_message (too far)"
    }
}

# step backward into function (thru return)

gdb_test "step" "(RETURN FROM CALLEE|ARRIVED IN CALLEE).*" \
    "reverse step into fn call"

# step backward out of called function (thru call)

set test_message "reverse step out of called fn"
gdb_test_multiple "step" "$test_message" {
    -re "STEP INTO THIS CALL.*.*$gdb_prompt $" {
	pass "$test_message"
    }
    -re "ARRIVED IN CALLEE.*$gdb_prompt $" {
	send_gdb "step\n"
	exp_continue
    }
    -re "ENTER CALLEE.*$gdb_prompt $" {
	send_gdb "step\n"
	exp_continue
    }
}

# next backward over call

gdb_test "next" ".*NEXT OVER THIS CALL.*" "reverse next over call"

# step/next backward with count

gdb_test "step 3" ".*REVERSE STEP TEST 1.*" "reverse step test 1"
gdb_test "next 2" ".*REVERSE NEXT TEST 1.*" "reverse next test 1"

# step/next backward without count

gdb_test "step" ".*STEP TEST 1.*" "reverse step test 2"
gdb_test "next" ".*NEXT TEST 1.*" "reverse next test 2"


# Finish test by running forward to the end.
# FIXME return to this later...
# gdb_test_no_output "set exec-dir forward" "set forward execution"
# gdb_continue_to_end "step-reverse.exp"