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# Copyright 1992, 1994, 1995, 1996, 1997, 1999, 2000, 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 .

# This file was written by Jeff Law. (law@cs.utah.edu)

if $tracelevel then {

    strace $tracelevel

}

set testfile "recurse"

set srcfile ${testfile}.c

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

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

     untested recurse.exp

     return -1

}

# Start with a fresh gdb.

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

proc recurse_tests {} {

    # Disable hardware watchpoints if necessary.

    if [target_info exists gdb,no_hardware_watchpoints] {

        gdb_test_no_output "set can-use-hw-watchpoints 0" ""

    }

    if [runto recurse] then {

        # First we need to step over the assignment of b, so it has a known

        # value.

        gdb_test "next" "if \\(a == 1\\)" "next over b = 0 in first instance"

        gdb_test "watch b" ".*\[Ww\]atchpoint \[0-9]*: b" \

            "set first instance watchpoint"

        # Continue until initial set of b.

        if [gdb_test "continue" \

            "Continuing.*\[Ww\]atchpoint.*: b.*Old value = 0.*New value = 10.*" \

            "continue to first instance watchpoint, first time"] then {

            gdb_suppress_tests;

        }

        # Continue inward for a few iterations

        gdb_test "continue" "Breakpoint.* recurse \\(a=9\\).*" \

            "continue to recurse (a = 9)"

        gdb_test "continue" "Breakpoint.* recurse \\(a=8\\).*" \

            "continue to recurse (a = 8)"

        gdb_test "continue" "Breakpoint.* recurse \\(a=7\\).*" \

            "continue to recurse (a = 7)"

        gdb_test "continue" "Breakpoint.* recurse \\(a=6\\).*" \

            "continue to recurse (a = 6)"

        gdb_test "continue" "Breakpoint.* recurse \\(a=5\\).*" \

            "continue to recurse (a = 5)"

        # Put a watchpoint on another instance of b

        # First we need to step over the assignment of b, so it has a known

        # value.

        gdb_test "next" "if \\(a == 1\\)" "next over b = 0 in second instance"

        gdb_test "watch b" ".*\[Ww\]atchpoint \[0-9]*: b" \

            "set second instance watchpoint"

        # Continue until initial set of b (second instance).

        if [gdb_test "continue" \

            "Continuing.*\[Ww\]atchpoint.*: b.*Old value = 0.*New value = 5.*"\

            "continue to second instance watchpoint, first time"] then {

        gdb_suppress_tests;

        }

        # Continue inward for a few iterations

        gdb_test "continue" "Breakpoint.* recurse \\(a=4\\).*" \

            "continue to recurse (a = 4)"

        gdb_test "continue" "Breakpoint.* recurse \\(a=3\\).*" \

            "continue to recurse (a = 3)"

        gdb_test "continue" "Breakpoint.* recurse \\(a=2\\).*" \

            "continue to recurse (a = 2)"

        gdb_test "continue" "Breakpoint.* recurse \\(a=1\\).*" \

            "continue to recurse (a = 1)"

        # Continue until second set of b (second instance).

        if [gdb_test "continue" \

            "Continuing.*\[Ww\]atchpoint.*: b.*Old value = 5.*New value = 120.*return.*" \

            "continue to second instance watchpoint, second time"] then {

            gdb_suppress_tests;

        }

        # Continue again.  We should have a watchpoint go out of scope now

        if [gdb_test "continue" \

            "Continuing.*\[Ww\]atchpoint.*deleted.*recurse \\(a=6\\) .*" \

            "second instance watchpoint deleted when leaving scope"] then {

            gdb_suppress_tests;

        }

        # Continue until second set of b (first instance).

        # 24320 is allowed as the final value for b as that's the value

        # b would have on systems with 16bit integers.

        #

        # We could fix the test program to deal with this too.

        if [gdb_test "continue" \

            "Continuing.*\[Ww\]atchpoint.*b.*Old value = 10.*New value = \(3628800|24320\).*return.*" \

            "continue to first instance watchpoint, second time"] then {

            gdb_suppress_tests

        }

        # Continue again.  We should have a watchpoint go out of scope now.

        #

        # The former version expected the test to return to main().

        # Now it expects the test to return to main or to stop in the

        # function's epilogue.

        #

        # The problem is that gdb needs to (but doesn't) understand

        # function epilogues in the same way as for prologues.

        #

        # If there is no hardware watchpoint (such as a x86 debug register),

        # then watchpoints are done "the hard way" by single-stepping the

        # target until the value of the watched variable changes.  If you

        # are single-stepping, you will eventually step into an epilogue.

        # When you do that, the "top" stack frame may become partially

        # deconstructed (as when you pop the frame pointer, for instance),

        # and from that point on, GDB can no longer make sense of the stack.

        #

        # A test which stops in the epilogue is trying to determine when GDB

        # leaves the stack frame in which the watchpoint was created.  It does

        # this basically by watching for the frame pointer to change.  When

        # the frame pointer changes, the test expects to be back in main, but

        # instead it is still in the epilogue of the callee.

        if [gdb_test "continue" \

            "Continuing.*\[Ww\]atchpoint.*deleted.*\(main \\(\\) \|21.*\}\).*" \

            "first instance watchpoint deleted when leaving scope"] then {

            gdb_suppress_tests;

        }

    }

    gdb_stop_suppressing_tests;

}

# Preserve the old timeout, and set a new one that should be

# sufficient to avoid timing out during this test.

set oldtimeout $timeout

set timeout [expr "$timeout + 60"]

verbose "Timeout is now $timeout seconds" 2

recurse_tests

# Restore the preserved old timeout value.

set timeout $oldtimeout

verbose "Timeout is now $timeout seconds" 2