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

# Copyright 1998, 1999, 2000, 2001, 2002, 2004, 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 .

# 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 testfile "restore"

set srcfile ${testfile}.c

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

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

    untested restore.exp

    return -1

}

proc restore_tests { } {

    global gdb_prompt

    if { ! [ runto driver ] } {

        return 0

    }

    set limit 5

    # 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} {

        # Set a breakpoint at the next caller function.

        gdb_test "tbreak caller$c" "Temporary breakpoint.*\[0-9\]*\\." \

            "tbreak caller$c"

        # Continue to the next caller function.

        gdb_test "continue" " caller$c prologue .*" "run to caller$c"

        # Do each callee function.

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

            gdb_test "tbreak callee$e" "Temporary breakpoint.*\[0-9\]*\\." \

                "caller$c calls callee$e; tbreak callee"

            gdb_test "continue" " callee$e prologue .*/" \

                "caller$c calls callee$e; continue to callee"

            # Do a forced return from the callee.

            set test "caller$c calls callee$e; return callee now"

            gdb_test "return 0" \

                " caller$c .*" \

                "$test" \

                "Make .* return now.*y or n. $" \

                "y"

            # 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$c calls callee$e; return restored l$var to $expected"

            }

        }

    }

    if ![gdb_skip_stdio_test "run to completion"] {

        send_gdb "continue\n"

        gdb_expect {

            -re "exiting" {

                pass "run to completion"

            }

            timeout {

                fail "(timeout) run to completion"

            }

        }

    } else {

        gdb_test "continue" ".*" ""

    }

}

# Start with a fresh gdb.

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

set prev_timeout $timeout

set timeout 30

restore_tests

set timeout $prev_timeout