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# step.exp -- Expect script to test gdb with step.c
# Copyright (C) 1992, 1997, 2007, 2008, 2009, 2010
# 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 was written by Hiro Sugawara. (hiro@lynx.com)
#
# This test really needs some major surgery to be acceptable, but
# I'm just about burnt out on lynx work, so I'm not doing it now.
#
#       * The test has an indeterminate number of pass/fails
#       for each run (it runs a small group of tests until
#       it's timer kicks off).  This is very bad for nightly
#       automated regression testing.
#
#       * It tries to "step" from withint he prologue of a
#       function.  This isn't support in gdb (it's going
#       to act like a continue).
#
#       * This test rarely check that it stopped in sensible
#       places.  (see previous bullet -- this test doesn't
#       catch the fact it continued rather than stepped)


if $tracelevel then {
        strace $tracelevel
}

set program_exited 0

proc set_bp { where } {
    global gdb_prompt

    send_gdb "break $where\n"
    # The first regexp is what we get with -g, the second without -g.
    gdb_expect {
        -re "Break.* at .*: file .*, line \[0-9\]*.*$gdb_prompt $" {}
        -re "Breakpoint \[0-9\]* at 0x\[0-9a-f\]*.*$gdb_prompt $" {}
        -re "$gdb_prompt $" { fail "setting breakpoint at $where" ; return 0 }
        timeout { fail "setting breakpoint at $where (timeout)" ; return 0 }
    }
    pass "set_bp"
}

proc step_it { cmd } {
    global gdb_prompt
    global program_exited

    send_gdb "$cmd\n"
    gdb_expect {
        -re "0x\[0-9A-Fa-f\]* *in.*\r\n$gdb_prompt $" { pass "step_it"; return 0 }
        -re "0x\[0-9A-Fa-f\]* *\[0-9\]*.*\r\n$gdb_prompt $" { pass "step_it"; return 1 }
        -re "Program exited .*\n$gdb_prompt $" {
                set program_exited 1
                return -1
            }
        -re "$gdb_prompt $"     { fail "single-stepping ($cmd).\n" ; return -1 }
        timeout { fail "single-stepping ($cmd) timout.\n" ; return -1 }
    }
}

proc step_inst {} {
    step_it "stepi"
}

proc step_source {} {
    step_it "step"
}

proc continue_all {} {
    global gdb_prompt

    send_gdb "continue\n"
    gdb_expect {
        -re "Breakpoint \[0-9\]*, thread\[0-9\]* .*$gdb_prompt $" { 
            pass "continue_all"
            return 0
        }
        -re "Program exited .*\n$gdb_prompt $" {
            set program_exited 1
            return 1;
        }
        -re "$gdb_prompt $" { fail "continue" ; return -1 }
        timeout { fail "continue (timeout)" ; return -1 }
    }
}

proc check_threads { num_threads } {
    global gdb_prompt

    set curr_thread 0
    send_gdb "info threads\n"
    while { $num_threads > 0 } {
        gdb_expect {
            -re "\\* *\[0-9\]* process \[0-9\]* thread \[0-9\]* .*\n" {
                incr curr_thread
                set num_threads [expr $num_threads - 1]
            }
            -re " *\[0-9\]* process \[0-9\]* thread \[0-9\]* .*\n" {
                set num_threads [expr $num_threads - 1]
            }
            -re "$gdb_prompt $" {
                if { $num_threads < 0 } {
                    fail "check_threads (too many)" ; return -1
                }
                break
            }
            timeout { fail "check_threads (timeout)" ; return -1 }
        }
    }

    if { $curr_thread == 0 } {
        fail "check_threads (no current thread)\n"
        return -1
    }
    if { $curr_thread > 1 } {
        fail "check_threads (more than one current thread)\n"
        return -1
    }
    return 0
}

proc test_cond_wait {} {
    global program_exited

    set_bp      135
    runto       179
    while { 1 } {
        set stepi_counter 0
        while { [step_inst] } {
                if { $program_exited } { break }
                incr stepi_counter
                if { $stepi_counter > 30 } {
                        fail "too many stepi's per line\n"
                        return -1
                }
        }
        if { $program_exited } { break }
        step_source
        if { $program_exited } { break }
        continue_all
        if { $program_exited } { break }
        check_threads 3
    }
}

proc do_tests {} {
    global prms_id
    global bug_id
    global subdir
    global objdir
    global srcdir
    global binfile
    global gdb_prompt

    set prms_id 0
    set bug_id 0

    # Start with a fresh gdb.

    gdb_exit
    gdb_start
    gdb_reinitialize_dir $srcdir/$subdir
    gdb_load $objdir/$subdir/$binfile

    send_gdb "set width 0\n"
    gdb_expect -re "$gdb_prompt $"

    test_cond_wait
}

# Check to see if we have an executable to test.  If not, then either we
# haven't tried to compile one, or the compilation failed for some reason.
# In either case, just notify the user and skip the tests in this file.

set binfile "step"
set srcfile "step.c"

if ![file exists $objdir/$subdir/$binfile] then {
    if $all_flag then {
        warning "$binfile does not exist; tests suppressed."
    }
} else {
    do_tests
}