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# Copyright 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 .

# This test is to check that a frame's "info frame", especially the

# saved registers list, doesn't change while that frame isn't current.

# It uses the program savedregs.c to construct a somewhat warped

# backtrace (contains both signal and dummy frames) and then, at each

# step checks that non-inner frames have consistent "info frame"

# output.  Note that a frame's "info frame" can only be captured after

# it is non-current (made a call, interrupted, ...), this is because

# instructions executed to perform the call may affect "info frame"

# output.

if [target_info exists gdb,nosignals] {

    verbose "Skipping savedregs.exp because of nosignals."

    continue

}

if $tracelevel then {

    strace $tracelevel

}

set testfile savedregs

set srcfile ${testfile}.c

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

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

    untested "Couldn't compile ${module}.c"

    return -1

}

# get things started

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

# Advance to main

if { ![runto_main] } {

    gdb_suppress_tests;

}

proc process_saved_regs { current inner outer } {

    global gdb_prompt

    global expect_out

    global saved_regs

    # Skip the CURRENT frame.

    set level 1

    # Run over the list of INNER frames capturing the "info frame"

    # output for each.  Both dummy and sigtramp frames need to be

    # handled specially: they do not yet have correct function names;

    # and for dummy frames won't have saved registers.  If there's a

    # problem, fail but capture the output anyway, hopefully later

    # "info frame" requests for that same frame will at least fail in

    # a consistent manner (stops propogated fails).

    foreach func $inner {

        set saved_regs($func) "error"

        set test "Get $func info frame"

        # Both dummy and sigtramp frames have problems.

        switch $func {

            dummy {

                # Dummy frame's do not have saved registers, and do

                # not print .

                set pat "Stack frame at .*"

            }

            sigtramp {

                # Sigtramp frames don't yet print .

                set pat "Stack frame at .* Saved registers:.*"

            }

            default {

                set pat "Stack frame at .* in $func .* Saved registers:.*"

            }

        }

        # If the "info frame" barf, capture the output anyway so that

        # it does not cascade further failures.

        gdb_test_multiple "info frame $level" "$test" {

            -re "($pat)$gdb_prompt " {

                set saved_regs($func) "$expect_out(1,string)"

                pass "$test"

            }

            -re "(Stack frame at .*)$gdb_prompt " {

                set saved_regs($func) "$expect_out(1,string)"

                fail "$test"

            }

            -re "(Cannot access .*)$gdb_prompt " {

                set saved_regs($func) "$expect_out(1,string)"

                fail "$test"

            }

        }

        incr level

    }

    # Now iterate through the list of OUTER frames checking that the

    # "info frame" output from each still matches what was captured

    # during an early query.  To avoid cascading failures, checking is

    # abandoned after the first failure.  The assumption is that,

    # since frames outer to the botched frame rely on the botched

    # frame's info, those more outer frames are also botched.  Besides

    # we've got the failure we're after.

    set ok 1

    foreach func $outer {

        set test [concat "Check $func info frame; stack contains" \

                      $current $inner $outer]

        if $ok {

            set ok 0

            set pat [string_to_regexp "$saved_regs($func)"]

            gdb_test_multiple "info frame $level" "$test" {

                -re "$pat$gdb_prompt " {

                    pass "$test"

                    set ok 1

                }

            }

        } {

            pass "$test (skipped)"

        }

        incr level

    }

}

# Continue to the signal thrower, capture main's saved-reg info.

gdb_test "advance thrower" "thrower .* at .*"

process_saved_regs thrower { main } { }

# Continue to the signal catcher, check main's saved-reg info, capture

# catcher's saved-reg info.

gdb_test "handle SIGSEGV pass print nostop"

gdb_test "advance catcher" "catcher .* at .*"

process_saved_regs catcher { sigtramp thrower } { main }

# Breakpoint at and call the caller function, saved-regs of main and

# catcher, capture caller's registers.

gdb_test "break caller"

gdb_test "call caller (1,2,3,4,5,6,7,8)"

process_saved_regs caller { dummy catcher } { sigtramp thrower main }

# Run to callee, again check everything.

gdb_test "advance callee" "callee .* at .*"

process_saved_regs callee { caller } { dummy catcher sigtramp thrower main }