# This testcase is part of GDB, the GNU debugger.
#
# 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/>.

if { [skip_btrace_tests] } {
    unsupported "target does not support record-btrace"
    return -1
}

standard_testfile
if {[gdb_compile_pthreads "$srcdir/$subdir/$srcfile" "$binfile" executable {debug}] != "" } {
    untested "failed to prepare"
    return -1
}

save_vars { GDBFLAGS } {
    append GDBFLAGS " -ex \"set non-stop on\""
    clean_restart $testfile
}

if ![runto_main] {
    untested "failed to run to main"
    return -1
}

# set up breakpoints
set bp_1 [gdb_get_line_number "bp.1" $srcfile]
set bp_2 [gdb_get_line_number "bp.2" $srcfile]
set bp_3 [gdb_get_line_number "bp.3" $srcfile]

gdb_breakpoint $bp_1
gdb_breakpoint $bp_2

# get the line number containing most of the trace
set loop [gdb_get_line_number "loop" $srcfile]

# a stop on the above line as reported by GDB
set loop_line "$loop\[^\\\r\\\n\]*/\\\* loop \\\*/"

# make sure $line matches the full expected output per thread.
# and let's hope that GDB never mixes the output from different threads.
proc gdb_cont_to { threads cmd line nthreads } {
    global gdb_prompt
    set full_cmd "thread apply $threads $cmd"

    # consume the prompt.  since we started the command in the background,
    # the prompt precedes any further output except some errors.
    gdb_test_multiple "$full_cmd &" "$full_cmd: prompt" {
        -re "$gdb_prompt " {
            pass "$full_cmd: prompt"
        }
    }

    # now check for the expected line - one per thread.
    for {set i 0} {$i < $nthreads} {incr i} {
        set test "$full_cmd: thread $i"

        gdb_test_multiple "" $test {
            -re "$line\[^\\\r\\\n\]*\r\n" {
                pass $test
            }
        }
    }
}

proc gdb_cont_to_bp_line { line threads nthreads } {
    gdb_cont_to $threads "continue" \
        [multi_line \
             "Breakpoint\[^\\\r\\\n\]*$line" \
             "\[^\\\r\\\n\]*" \
            ] \
        $nthreads
}

proc gdb_cont_to_no_history { threads cmd nthreads } {
    gdb_cont_to $threads $cmd \
        [multi_line \
             "No more reverse-execution history\." \
             "\[^\\\r\\\n\]*" \
             "\[^\\\r\\\n\]*" \
            ] \
        $nthreads
}

# trace the code between the two breakpoints
gdb_cont_to_bp_line "$srcfile:$bp_1" all 2
gdb_test_no_output "record btrace"
gdb_cont_to_bp_line "$srcfile:$bp_2" all 2

# we don't need those breakpoints any longer.
# they will only disturb our stepping.
delete_breakpoints

# show the threads - this is useful for debugging fails
gdb_test "thread apply all info rec" ".*"
gdb_test "info threads" ".*"

with_test_prefix "navigate" {
    gdb_test "thread apply 1 record goto 2" "$loop_line"
    gdb_test "thread apply 2 record goto 4" "$loop_line"
    gdb_test "thread apply 1 info record" \
        ".*Replay in progress\.  At instruction 2\."
    gdb_test "thread apply 2 info record" \
        ".*Replay in progress\.  At instruction 4\."

    gdb_test "thread apply all record goto 5" "$loop_line"
    gdb_test "thread apply 1 info record" \
        ".*Replay in progress\.  At instruction 5\."
    gdb_test "thread apply 2 info record" \
        ".*Replay in progress\.  At instruction 5\."
}

with_test_prefix "step" {
    with_test_prefix "thread 1" {
        gdb_test "thread apply 1 stepi 2" "$loop_line"
        gdb_test "thread apply 1 info record" \
            ".*Replay in progress\.  At instruction 7\."
        gdb_test "thread apply 2 info record" \
            ".*Replay in progress\.  At instruction 5\."
    }

    with_test_prefix "thread 2" {
        gdb_test "thread apply 2 stepi 3" "$loop_line"
        gdb_test "thread apply 1 info record" \
            ".*Replay in progress\.  At instruction 7\."
        gdb_test "thread apply 2 info record" \
            ".*Replay in progress\.  At instruction 8\."
    }

    with_test_prefix "all" {
        gdb_cont_to all "stepi 4" "$loop_line" 2
        gdb_test "thread apply 1 info record" \
            ".*Replay in progress\.  At instruction 11\."
        gdb_test "thread apply 2 info record" \
            ".*Replay in progress\.  At instruction 12\."
    }
}

with_test_prefix "reverse-step" {
    with_test_prefix "thread 1" {
        gdb_test "thread apply 1 reverse-stepi 2" "$loop_line"
        gdb_test "thread apply 1 info record" \
            ".*Replay in progress\.  At instruction 9\."
        gdb_test "thread apply 2 info record" \
            ".*Replay in progress\.  At instruction 12\."
    }

    with_test_prefix "thread 2" {
        gdb_test "thread apply 2 reverse-stepi 3" "$loop_line"
        gdb_test "thread apply 1 info record" \
            ".*Replay in progress\.  At instruction 9\."
        gdb_test "thread apply 2 info record" \
            ".*Replay in progress\.  At instruction 9\."
    }

    with_test_prefix "all" {
        gdb_cont_to all "reverse-stepi 4" "$loop_line" 2
        gdb_test "thread apply 1 info record" \
            ".*Replay in progress\.  At instruction 5\."
        gdb_test "thread apply 2 info record" \
            ".*Replay in progress\.  At instruction 5\."
    }
}

with_test_prefix "continue" {
    with_test_prefix "thread 1" {
        gdb_cont_to_no_history 1 "continue" 1
        gdb_test "thread apply 1 info record" \
            ".*Recorded \[0-9\]+ instructions \[^\\\r\\\n\]*"
        gdb_test "thread apply 2 info record" \
            ".*Replay in progress\.  At instruction 5\."

        gdb_cont_to_no_history 1 "reverse-continue" 1
        gdb_test "thread apply 1 info record" \
            ".*Replay in progress\.  At instruction 1\."
        gdb_test "thread apply 2 info record" \
            ".*Replay in progress\.  At instruction 5\."
    }

    with_test_prefix "thread 2" {
        gdb_cont_to_no_history 2 "continue" 1
        gdb_test "thread apply 1 info record" \
            ".*Replay in progress\.  At instruction 1\."
        gdb_test "thread apply 2 info record" \
            ".*Recorded \[0-9\]+ instructions \[^\\\r\\\n\]*"

        gdb_cont_to_no_history 2 "reverse-continue" 1
        gdb_test "thread apply 1 info record" \
            ".*Replay in progress\.  At instruction 1\."
        gdb_test "thread apply 2 info record" \
            ".*Replay in progress\.  At instruction 1\."
    }
}

# a thread may only resume if no thread is still replaying
with_test_prefix "no progress" {
    with_test_prefix "thread 1" {
        gdb_test "thread apply 1 record goto end" ".*"
        gdb_test "thread apply 2 record goto begin" ".*"

        gdb_cont_to_no_history 1 "continue" 1
        gdb_cont_to_no_history 1 "step" 1
        gdb_test "thread apply 1 info record" \
            ".*Recorded \[0-9\]+ instructions \[^\\\r\\\n\]*"
        gdb_test "thread apply 2 info record" \
            ".*Replay in progress\.  At instruction 1\."
    }

    with_test_prefix "thread 2" {
        gdb_test "thread apply 1 record goto begin" ".*"
        gdb_test "thread apply 2 record goto end" ".*"

        gdb_cont_to_no_history 2 "continue" 1
        gdb_cont_to_no_history 2 "step" 1
        gdb_test "thread apply 1 info record" \
            ".*Replay in progress\.  At instruction 1\."
        gdb_test "thread apply 2 info record" \
            ".*Recorded \[0-9\]+ instructions \[^\\\r\\\n\]*"
    }

    with_test_prefix "all" {
        gdb_test "thread apply all record goto begin" ".*"

        gdb_cont_to_no_history all "continue" 2
        gdb_test "thread apply 1 info record" \
            ".*Recorded \[0-9\]+ instructions \[^\\\r\\\n\]*"
        gdb_test "thread apply 2 info record" \
            ".*Recorded \[0-9\]+ instructions \[^\\\r\\\n\]*"
    }
}

# now that both threads stopped replaying we may resume recording
with_test_prefix "cont to end" {
    gdb_breakpoint $bp_3
    gdb_cont_to_bp_line "$srcfile:$bp_3" all 1
}