# Copyright 2008-2023 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 with a reloaded process record file.
#

# This test suitable only for process record-replay
require supports_process_record

standard_testfile step-reverse.c
set precsave [standard_output_file step.precsave]

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

runto_main

# Activate process record/replay
gdb_test_no_output "record" "turn on process record"

set end_of_main [gdb_get_line_number "end of main" ]
gdb_test "break $end_of_main" \
    "Breakpoint $decimal at .*$srcfile, line $end_of_main\." \
    "breakpoint at end of main"

# This can take awhile.
with_timeout_factor 20 {
    gdb_test_multiple "continue" "run to end of main" {
	-re -wrap "Breakpoint .* end of main .*" {
	    pass $gdb_test_name
	}
	-re -wrap "Process record does not support instruction 0xc5 at.*" {
	    kfail "record/23188" $gdb_test_name
	}
	-re -wrap "Process record does not support instruction 0xfae64 at.*" {
	    kfail "record/25038" $gdb_test_name
	}
	-re -wrap "Process record does not support instruction 0x62 at.*" {
	    kfail "record/30807" $gdb_test_name
	}
    }
}

# So can this, against gdbserver, for example.

with_timeout_factor 10 {
    gdb_test "record save $precsave" \
	"Saved core file $precsave with execution log\."  \
	"save process recfile"
}

gdb_test "kill" "" "kill process, prepare to debug log file" \
    "Kill the program being debugged\\? \\(y or n\\) " "y"

gdb_test "record restore $precsave" \
    "Restored records from core file .*" \
    "reload core file"

# 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 RECURSION.*" "step up to call"
gdb_test "next" ".*NEXT OVER THIS CALL.*" "skip recursive 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 alphanum_re "\[a-zA-Z0-9\]"
set pic_thunk_re  "__$alphanum_re*\\.get_pc_thunk\\.$alphanum_re* \\(\\)"
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 $" {
	send_gdb "stepi\n"
	exp_continue
    }
    -re "$pic_thunk_re.*$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 start_pc [get_hexadecimal_valueof "\$pc" 0 "getting PC at start of stepi backwards"]
set step_count 0
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 $" {
	incr step_count
	if { [get_hexadecimal_valueof "\$pc" 0 "getting PC after $step_count steps"] == $start_pc } {
	    fail "$test_message (start statement)"
	} else {
	    send_gdb "stepi\n"
	    exp_continue
	}
    }
    -re "ENTER CALLEE.*$gdb_prompt $" {
	send_gdb "stepi\n" 
	exp_continue
    }
    -re "$pic_thunk_re.*$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 calls.

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