# Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2004
# 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

# 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
}

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}] != "" } {
     gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
}

# Create a core file named "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".  In the latter case, we
# could have many core files lying around, and it may be difficult to
# tell which one is ours, so let's run the program in a subdirectory.

set found 0
set coredir "${objdir}/${subdir}/coredir.[getpid]"
file mkdir $coredir
catch "system \"(cd ${coredir}; ${binfile}; true) >/dev/null 2>&1\""
set names [glob -nocomplain -directory $coredir *core*]
if {[llength $names] == 1} {
    set file [file join $coredir [lindex $names 0]]
    remote_exec build "mv $file $corefile"
    set found 1
}

# Try to clean up after ourselves. 
remote_file build delete [file join $coredir coremmap.data]
remote_exec build "rmdir $coredir"
    
if { $found == 0  } {
    warning "can't generate a core file - core tests suppressed - check ulimit -c"
    return 0
}

# 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.*"

# 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 $" {
	    xfail "check core size (system does not support large corefiles)"
	}
    }
    if {$core_ok == 0} {
	return 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]

# 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