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# Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2004, 2005,
# 2007, 2008 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/>.

# Please email any bugs, comments, and/or additions to this file to:
# bug-gdb@prep.ai.mit.edu

# This file is based on corefile.exp which was written by Fred
# Fish. (fnf@cygnus.com)

if $tracelevel then {
        strace $tracelevel
}

set prms_id 0
set bug_id 0

# Are we on a target board?  As of 2004-02-12, GDB didn't have a
# mechanism that would let it efficiently access a remote corefile.

if ![isnative] then {
    untested "Remote system"
    return
}

# Can the system run this test (in particular support sparse
# corefiles)?  On systems that lack sparse corefile support this test
# consumes too many resources - gigabytes worth of disk space and and
# I/O bandwith.

if { [istarget "*-*-*bsd*"]
     || [istarget "*-*-hpux*"]
     || [istarget "*-*-solaris*"] 
     || [istarget "*-*-cygwin*"] } {
    untested "Kernel lacks sparse corefile support (PR gdb/1551)"
    return
}

# This testcase causes too much stress (in terms of memory usage)
# on certain systems...
if { [istarget "*-*-*irix*"] } {
    untested "Testcase too stressful for this system"
    return
}

set testfile "bigcore"
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}
set corefile ${objdir}/${subdir}/${testfile}.corefile

if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
     untested bigcore.exp
     return -1
}

# Run GDB on the bigcore program up-to where it will dump core.

gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}
gdb_test "set print sevenbit-strings" "" \
        "set print sevenbit-strings; ${testfile}"
gdb_test "set width 0" "" \
        "set width 0; ${testfile}"
if { ![runto_main] } then {
    gdb_suppress_tests;
}
set print_core_line [gdb_get_line_number "Dump core"]
gdb_test "tbreak $print_core_line"
gdb_test continue ".*print_string.*"
gdb_test next ".*0 = 0.*"

# Traverse part of bigcore's linked list of memory chunks (forward or
# backward), saving each chunk's address.

proc extract_heap { dir } {
    global gdb_prompt
    global expect_out
    set heap ""
    set test "extract ${dir} heap"
    set lim 0
    gdb_test_multiple "print heap.${dir}" "$test" {
        -re " = \\(struct list \\*\\) 0x0.*$gdb_prompt $" {
            pass "$test"
        }
        -re " = \\(struct list \\*\\) (0x\[0-9a-f\]*).*$gdb_prompt $" {
            set heap [concat $heap $expect_out(1,string)]
            if { $lim >= 50 } {
                pass "$test (stop at $lim)"
            } else {
                incr lim
                send_gdb "print \$.${dir}\n"
                exp_continue
            }
        }
        -re ".*$gdb_prompt $" {
            fail "$test (entry $lim)"
        }
        timeout {
            fail "$test (timeout)"
        }
    }
    return $heap;
}
set next_heap [extract_heap next]
set prev_heap [extract_heap prev]

# Save the total allocated size within GDB so that we can check
# the core size later.
gdb_test "set \$bytes_allocated = bytes_allocated" "" "save heap size"

# Now create a core dump

# Rename the core file to "TESTFILE.corefile" rather than just "core",
# to avoid problems with sys admin types that like to regularly prune
# all files named "core" from the system.

# Some systems append "core" to the name of the program; others append
# the name of the program to "core"; still others (like Linux, as of
# May 2003) create cores named "core.PID".

# Save the process ID.  Some systems dump the core into core.PID.
set test "grab pid"
gdb_test_multiple "info program" $test {
    -re "child process (\[0-9\]+).*$gdb_prompt $" {
        set inferior_pid $expect_out(1,string)
        pass $test
    }
    -re "$gdb_prompt $" {
        set inferior_pid unknown
        pass $test
    }
}

# Dump core using SIGABRT
set oldtimeout $timeout
set timeout 600
gdb_test "signal SIGABRT" "Program terminated with signal SIGABRT, .*"

# Find the corefile
set file ""
foreach pat [list core.${inferior_pid} ${testfile}.core core] {
    set names [glob -nocomplain $pat]
    if {[llength $names] == 1} {
        set file [lindex $names 0]
        remote_exec build "mv $file $corefile"
        break
    }
}

if { $file == "" } {
    untested "Can't generate a core file"
    return 0
}

# Check that the corefile is plausibly large enough.  We're trying to
# detect the case where the operating system has truncated the file
# just before signed wraparound.  TCL, unfortunately, has a similar
# problem - so use catch.  It can handle the "bad" size but not
# necessarily the "good" one.  And we must use GDB for the comparison,
# similarly.

if {[catch {file size $corefile} core_size] == 0} {
    set core_ok 0
    gdb_test_multiple "print \$bytes_allocated < $core_size" "check core size" {
        -re " = 1\r\n$gdb_prompt $" {
            pass "check core size"
            set core_ok 1
        }
        -re " = 0\r\n$gdb_prompt $" {
            pass "check core size"
            set core_ok 0
        }
    }
} { 
    # Probably failed due to the TCL build having problems with very
    # large values.  Since GDB uses a 64-bit off_t (when possible) it
    # shouldn't have this problem.  Assume that things are going to
    # work.  Without this assumption the test is skiped on systems
    # (such as i386 GNU/Linux with patched kernel) which do pass.
    pass "check core size"
    set core_ok 1
}
if {! $core_ok} {
    untested "check core size (system does not support large corefiles)"
    return 0
}

# Now load up that core file

set test "load corefile"
gdb_test_multiple "core $corefile" "$test" {
    -re "A program is being debugged already.  Kill it. .y or n. " {
        send_gdb "y\n"
        exp_continue
    }
    -re "Core was generated by.*$gdb_prompt $" {
        pass "$test"
    }
}

# Finally, re-traverse bigcore's linked list, checking each chunk's
# address against the executable.  Don't use gdb_test_multiple as want
# only one pass/fail.  Don't use exp_continue as the regular
# expression involving $heap needs to be re-evaluated for each new
# response.

proc check_heap { dir heap } {
    global gdb_prompt
    set test "check ${dir} heap"
    set ok 1
    set lim 0
    send_gdb "print heap.${dir}\n"
    while { $ok } {
        gdb_expect {
            -re " = \\(struct list \\*\\) [lindex $heap $lim].*$gdb_prompt $" {
                if { $lim >= [llength $heap] } {
                    pass "$test"
                    set ok 0
                } else {
                    incr lim
                    send_gdb "print \$.${dir}\n"
                }
            }
            -re ".*$gdb_prompt $" {
                fail "$test (address [lindex $heap $lim])"
                set ok 0
            }
            timeout {
                fail "$test (timeout)"
                set ok 0
            }
        }
    }
}

check_heap next $next_heap
check_heap prev $prev_heap