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# Copyright (C) 1998 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 2 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, write to the Free Software

# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

# Please email any bugs, comments, and/or additions to this file to:

# bug-gdb@prep.ai.mit.edu

# Test GDB's ability to restore saved registers from stack frames

# when using the `return' command.

#

# This file was written by Jim Blandy , with

# fragments borrowed from return.exp.

if $tracelevel then {

        strace $tracelevel

}

set prms_id 0

set bug_id 0

set testfile "restore"

set srcfile ${testfile}.c

set binfile ${objdir}/${subdir}/${testfile}

if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {

     gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."

}

proc restore_tests { } {

    global gdb_prompt

    if { ! [ runto driver ] } then { return 0 }

    set limit 5

    # Set breakpoints at each of the `caller' functions.

    for {set c 1} {$c <= $limit} {incr c} {

      gdb_test "break caller$c" "Breakpoint.*\[0-9\]*\\." "break caller$c"

    }

    # Set breakpoints at each of the `callee' functions.

    for {set c 1} {$c <= $limit} {incr c} {

      gdb_test "break callee$c" "Breakpoint.*\[0-9\]*\\." "break caller$c"

    }

    # For each caller function,

    #   call each of the callee functions,

    #   force a return from the callee, and

    #   make sure that the local variables still have the right values.

    for {set c 1} {$c <= $limit} {incr c} {

        # Continue to the next caller function.

        gdb_test "continue" ".*/\\* caller$c \\*/" "run to caller$c"

        # Do each callee function.

        for {set e 1} {$e <= $limit} {incr e} {

            gdb_test "  continue" ".*/\\* callee$e \\*/" "run to callee$e"

            # Do a forced return from the callee.

            send_gdb "return 0\n"

            gdb_expect {

                -re "Make .* return now.*y or n. $" {

                    send_gdb "y\n"

                    exp_continue

                }

                -re "$gdb_prompt $" { }

            }

            # Check that the values of the local variables are what

            # they should be.

            for {set var 1} {$var <= $c} {incr var} {

                set expected [expr 0x7eeb + $var]

                gdb_test "print l$var" " = $expected" \

                         "caller$c called callee$e; variable l$var restored"

            }

        }

    }

    send_gdb "continue\n"

    gdb_expect {

        -re "exiting" {

             pass "run to completion"

        }

        timeout {

             fail "(timeout) run to completion"

        }

    }

}

# Start with a fresh gdb.

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

set timeout 30

restore_tests