old-cross-binutils/gdb/testsuite/lib/gdb.exp

# Copyright (C) 1992, 1994, 1995 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 was written by Fred Fish. (fnf@cygnus.com)

# Generic gdb subroutines that should work for any target.  If these
# need to be modified for any target, it can be done with a variable
# or by passing arguments.

load_lib libgloss.exp

global GDB
global CHILL_LIB
global CHILL_RT0

if ![info exists CHILL_LIB] {
    set CHILL_LIB [findfile $base_dir/../../gcc/ch/runtime/libchill.a "$base_dir/../../gcc/ch/runtime/libchill.a" [transform -lchill]]
}
verbose "using CHILL_LIB = $CHILL_LIB" 2
if ![info exists CHILL_RT0] {
    set CHILL_RT0 [findfile $base_dir/../../gcc/ch/runtime/chillrt0.o "$base_dir/../../gcc/ch/runtime/chillrt0.o" ""]
}
verbose "using CHILL_RT0 = $CHILL_RT0" 2

if ![info exists GDB] {
    if ![is_remote host] {
	set GDB [findfile $base_dir/../../gdb/gdb "$base_dir/../../gdb/gdb" [transform gdb]]
    } else {
	set GDB gdb
    }
}
verbose "using GDB = $GDB" 2

global GDBFLAGS
if ![info exists GDBFLAGS] {
    set GDBFLAGS "-nx"
}
verbose "using GDBFLAGS = $GDBFLAGS" 2

# The variable prompt is a regexp which matches the gdb prompt.  Set it if it
# is not already set.
global gdb_prompt
if ![info exists prompt] then {
    set gdb_prompt "\[(\]gdb\[)\]"
}

#
# gdb_version -- extract and print the version number of GDB
#
proc default_gdb_version {} {
    global GDB
    global GDBFLAGS
    global gdb_prompt
    set fileid [open "gdb_cmd" w];
    puts $fileid "q";
    close $fileid;
    set cmdfile [remote_download host "gdb_cmd"];
    set output [remote_exec host "$GDB -nw --command $cmdfile"]
    remote_file build delete "gdb_cmd";
    remote_file host delete "$cmdfile";
    set tmp [lindex $output 1];
    set version ""
    regexp " \[0-9\]\[^ \t\n\r\]+" "$tmp" version
    if ![is_remote host] {
	clone_output "[which $GDB] version $version $GDBFLAGS\n"
    } else {
	clone_output "$GDB on remote host version $version $GDBFLAGS\n"
    }
}

proc gdb_version { } {
    return [default_gdb_version];
}

#
# gdb_unload -- unload a file if one is loaded
#

proc gdb_unload {} {
    global verbose
    global GDB
    global gdb_prompt
    send_gdb "file\n"
    gdb_expect {
	-re "No exec file now.*\r" { exp_continue }
	-re "No symbol file now.*\r" { exp_continue }
	-re "A program is being debugged already..*Kill it.*y or n. $"\
	    { send_gdb "y\n"
		verbose "\t\tKilling previous program being debugged"
	    exp_continue
	}
	-re "Discard symbol table from .*y or n. $" {
	    send_gdb "y\n"
	    exp_continue
	}
	-re "$gdb_prompt $" {}
	timeout {
	    perror "couldn't unload file in $GDB (timed out)."
	    return -1
	}
    }
}

# Many of the tests depend on setting breakpoints at various places and
# running until that breakpoint is reached.  At times, we want to start
# with a clean-slate with respect to breakpoints, so this utility proc 
# lets us do this without duplicating this code everywhere.
#

proc delete_breakpoints {} {
    global gdb_prompt
    global gdb_spawn_id

    send_gdb "delete breakpoints\n"
    gdb_expect {
	 -re ".*Delete all breakpoints.*y or n.*$" {
	    send_gdb "y\n";
	    exp_continue
	}
	 -re ".*$gdb_prompt $" { # This happens if there were no breakpoints
	    }
	 timeout { perror "Delete all breakpoints in delete_breakpoints (timeout)" ; return }
    }
    send_gdb "info breakpoints\n"
    gdb_expect {
	 -re "No breakpoints or watchpoints..*$gdb_prompt $" {}
	 -re ".*$gdb_prompt $" { perror "breakpoints not deleted" ; return }
	 -re "Delete all breakpoints.*or n.*$" {
	    send_gdb "y\n";
	    exp_continue
	}
	 timeout { perror "info breakpoints (timeout)" ; return }
    }
}


#
# Generic run command.
#
# The second pattern below matches up to the first newline *only*.
# Using ``.*$'' could swallow up output that we attempt to match
# elsewhere.
#
proc gdb_run_cmd {args} {
    global gdb_prompt
    global gdb_spawn_id

    set spawn_id $gdb_spawn_id

    if [target_info exists use_gdb_stub] {
	if [target_info exists gdb,start_symbol] {
	    set start [target_info gdb,start_symbol];
	} else {
	    set start "start";
	}
	send_gdb  "jump *$start\n"
	gdb_expect {
	    -re "Continuing at \[^\r\n\]*\[\r\n\]" {
		if ![target_info exists gdb_stub] {
		    return;
		}
	    }
	    -re "No symbol \"start\" in current.*$gdb_prompt $" {
		send_gdb "jump *_start\n";
		exp_continue;
	    }
	    -re "No symbol \"_start\" in current.*$gdb_prompt $" {
		perror "Can't find start symbol to run in gdb_run";
		return;
	    }
	    -re "Line.* Jump anyway.*y or n. $" {
		send_gdb "y\n"
		exp_continue;
            }
	    -re "No symbol.*context.*$gdb_prompt $" {}
	    -re "The program is not being run.*$gdb_prompt $" {
		gdb_load "";
	    }
	    timeout { perror "Jump to start() failed (timeout)"; return }
	}
	if [target_info exists gdb_stub] {
	    gdb_expect {
		-re ".*$gdb_prompt $" {
		    send_gdb "continue\n"
		}
	    }
	}
	return
    }
    send_gdb "run $args\n"
# This doesn't work quite right yet.
    gdb_expect {
	-re "The program .* has been started already.*y or n. $" {
	    send_gdb "y\n"
	    exp_continue
	}
	-re "Starting program: \[^\n\]*" {}
    }
}

proc gdb_breakpoint { function } {
    global gdb_prompt
    global decimal
    global gdb_spawn_id

    set spawn_id $gdb_spawn_id

    send_gdb "break $function\n"
    # The first two regexps are what we get with -g, the third is without -g.
    gdb_expect {
	-re "Breakpoint \[0-9\]* at .*: file .*, line $decimal.\r\n$gdb_prompt $" {}
	-re "Breakpoint \[0-9\]*: file .*, line $decimal.\r\n$gdb_prompt $" {}
	-re "Breakpoint \[0-9\]* at .*$gdb_prompt $" {}
	-re "$gdb_prompt $" { fail "setting breakpoint at $function" ; return 0 }
	timeout { fail "setting breakpoint at $function (timeout)" ; return 0 }
    }
    return 1;
}    

# Set breakpoint at function and run gdb until it breaks there.
# Since this is the only breakpoint that will be set, if it stops
# at a breakpoint, we will assume it is the one we want.  We can't
# just compare to "function" because it might be a fully qualified,
# single quoted C++ function specifier.

proc runto { function } {
    global gdb_prompt
    global decimal
    global gdb_spawn_id

    set spawn_id $gdb_spawn_id

    delete_breakpoints

    if ![gdb_breakpoint $function] {
	return 0;
    }

    gdb_run_cmd
    
    # the "at foo.c:36" output we get with -g.
    # the "in func" output we get without -g.
    gdb_expect {
	-re "Break.* at .*:$decimal.*$gdb_prompt $" {
	    return 1
	}
	-re "Breakpoint \[0-9\]*, \[0-9xa-f\]* in .*$gdb_prompt $" { 
	    return 1
	}
	-re "$gdb_prompt $" { 
	    fail "running to $function in runto"
	    return 0
	}
	timeout { 
	    fail "running to $function in runto (timeout)"
	    return 0
	}
    }
    return 1
}

#
# runto_main -- ask gdb to run until we hit a breakpoint at main.
#		The case where the target uses stubs has to be handled
#		specially--if it uses stubs, assuming we hit
#		breakpoint() and just step out of the function.
#
proc runto_main {} {
    global gdb_prompt
    global decimal

    if ![target_info exists gdb_stub] {
	return [runto main]
    }			

    delete_breakpoints

    send_gdb "step\n"
    # if use stubs step out of the breakpoint() function.
    gdb_expect {
	-re "main.* at .*$gdb_prompt $" {}
	-re "_start.*$gdb_prompt $" {}
	timeout { fail "single step at breakpoint() (timeout)" ; return 0 }
    }
    return 1
}

#
# gdb_test -- send_gdb a command to gdb and test the result.
#             Takes three parameters.
#             Parameters:
#                First one is the command to execute.  If this is the null string
#		   then no command is sent.
#                Second one is the pattern to match for a PASS, and must NOT include
#		   the \r\n sequence immediately before the gdb prompt.
#                Third one is an optional message to be printed. If this
#                  a null string "", then the pass/fail messages use the command
#		   string as the message.
#             Returns:
#                1 if the test failed,
#                0 if the test passes,
#               -1 if there was an internal error.
#
proc gdb_test { args } {
    global verbose
    global gdb_prompt
    global GDB
    global expect_out
    upvar timeout timeout
    global gdb_spawn_id;

    if [llength $args]>2 then {
	set message [lindex $args 2]
    } else {
	set message [lindex $args 0]
    }
    set command [lindex $args 0]
    set pattern [lindex $args 1]

    if [llength $args]==5 {
	set question_string [lindex $args 3];
	set response_string [lindex $args 4];
    } else {
	set question_string "^FOOBAR$"
    }

    if $verbose>2 then {
	send_user "Sending \"$command\" to gdb\n"
	send_user "Looking to match \"$pattern\"\n"
	send_user "Message is \"$message\"\n"
    }

    set result -1
    if ![string match $command ""] {
	if { [send_gdb "$command\n"] != "" } {
	    perror "Couldn't send $command to GDB.";
	    return $result;
	}
    }

    gdb_expect {
	 -re ".*Ending remote debugging.*$gdb_prompt$" {
	    if ![isnative] then {
		warning "Can`t communicate to remote target."
	    }
	    gdb_exit
	    gdb_start
	    set result -1
	}
	 -re "\[\r\n\]*($pattern)\[\r\n\]+$gdb_prompt $" {
	    if ![string match "" $message] then {
		pass "$message"
	    }
	    set result 0
	}
	 -re "(${question_string})$" {
	    send_gdb "$response_string\n";
	    exp_continue;
	}
	 -re "Undefined command:.*$gdb_prompt" {
	    perror "Undefined command \"$command\"."
	    set result 1
	}
	 -re "Ambiguous command.*$gdb_prompt $" {
	    perror "\"$command\" is not a unique command name."
	    set result 1
	}
	 -re ".*Program exited with code \[0-9\]+.*$gdb_prompt $" {
	    if ![string match "" $message] then {
		set errmsg "$message: the program exited"
	    } else {
		set errmsg "$command: the program exited"
	    }
	    fail "$errmsg"
	    return -1
	}
	 -re "The program is not being run.*$gdb_prompt $" {
	    if ![string match "" $message] then {
		set errmsg "$message: the program is no longer running"
	    } else {
		set errmsg "$command: the program is no longer running"
	    }
	    fail "$errmsg"
	    return -1
	}
	 -re ".*$gdb_prompt $" {
	    if ![string match "" $message] then {
		fail "$message"
	    }
	    set result 1
	}
	 "<return>" {
	    send_gdb "\n"
	    perror "Window too small."
	}
	 -re "\\(y or n\\) " {
	    send_gdb "n\n"
	    perror "Got interactive prompt."
	}
	 eof {
	     perror "Process no longer exists"
	     if { $message != "" } {
		 fail "$message"
	     }
	     return -1
	}
	 full_buffer {
	    perror "internal buffer is full."
	}
	timeout	{
	    if ![string match "" $message] then {
		fail "$message (timeout)"
	    }
	    set result 1
	}
    }
    return $result
}

# Test that a command gives an error.  For pass or fail, return
# a 1 to indicate that more tests can proceed.  However a timeout
# is a serious error, generates a special fail message, and causes
# a 0 to be returned to indicate that more tests are likely to fail
# as well.

proc test_print_reject { args } {
    global gdb_prompt
    global verbose

    if [llength $args]==2 then {
	set expectthis [lindex $args 1]
    } else {
	set expectthis "should never match this bogus string"
    }
    set sendthis [lindex $args 0]
    if $verbose>2 then {
	send_user "Sending \"$sendthis\" to gdb\n"
	send_user "Looking to match \"$expectthis\"\n"
    }
    send_gdb "$sendthis\n"
    gdb_expect {
	-re ".*A .* in expression.*\\.*$gdb_prompt $" {
	    pass "reject $sendthis"
	    return 1
	}
	-re ".*Invalid syntax in expression.*$gdb_prompt $" {
	    pass "reject $sendthis"
	    return 1
	}
	-re ".*Junk after end of expression.*$gdb_prompt $" {
	    pass "reject $sendthis"
	    return 1
	}
	-re ".*Invalid number.*$gdb_prompt $" {
	    pass "reject $sendthis"
	    return 1
	}
	-re ".*Invalid character constant.*$gdb_prompt $" {
	    pass "reject $sendthis"
	    return 1
	}
	-re ".*No symbol table is loaded.*$gdb_prompt $" {
	    pass "reject $sendthis"
	    return 1
	}
	-re ".*No symbol .* in current context.*$gdb_prompt $" {
	    pass "reject $sendthis"
	    return 1
	}
	-re ".*$expectthis.*$gdb_prompt $" {
	    pass "reject $sendthis"
	    return 1
	}
	-re ".*$gdb_prompt $" {
	    fail "reject $sendthis"
	    return 1
	}
	default {
	    fail "reject $sendthis (eof or timeout)"
	    return 0
	}
    }
}

# Given an input string, adds backslashes as needed to create a
# regexp that will match the string.

proc string_to_regexp {str} {
    set result $str
    regsub -all {[]*+.|()^$\[]} $str {\\&} result
    return $result
}

# Same as gdb_test, but the second parameter is not a regexp,
# but a string that must match exactly.

proc gdb_test_exact { args } {
    upvar timeout timeout

    set command [lindex $args 0]

    # This applies a special meaning to a null string pattern.  Without
    # this, "$pattern\r\n$gdb_prompt $" will match anything, including error
    # messages from commands that should have no output except a new
    # prompt.  With this, only results of a null string will match a null
    # string pattern.

    set pattern [lindex $args 1]
    if [string match $pattern ""] {
	set pattern [string_to_regexp [lindex $args 0]]
    } else {
	set pattern [string_to_regexp [lindex $args 1]]
    }

    # It is most natural to write the pattern argument with only
    # embedded \n's, especially if you are trying to avoid Tcl quoting
    # problems.  But gdb_expect really wants to see \r\n in patterns.  So
    # transform the pattern here.  First transform \r\n back to \n, in
    # case some users of gdb_test_exact already do the right thing.
    regsub -all "\r\n" $pattern "\n" pattern
    regsub -all "\n" $pattern "\r\n" pattern
    if [llength $args]==3 then {
	set message [lindex $args 2]
    } else {
	set message $command
    }

    return [gdb_test $command $pattern $message]
}

proc gdb_reinitialize_dir { subdir } {
    global gdb_prompt
    global gdb_spawn_id
    set spawn_id $gdb_spawn_id

    if [is_remote host] {
	return "";
    }
    send_gdb "dir\n"
    gdb_expect {
	-re "Reinitialize source path to empty.*y or n. " {
	    send_gdb "y\n"
	    gdb_expect {
		-re "Source directories searched.*$gdb_prompt $" {
		    send_gdb "dir $subdir\n"
		    gdb_expect {
			-re "Source directories searched.*$gdb_prompt $" {
			    verbose "Dir set to $subdir"
			}
			-re ".*$gdb_prompt $" {
			    perror "Dir \"$subdir\" failed."
			}
		    }
		}
		-re ".*$gdb_prompt $" {
		    perror "Dir \"$subdir\" failed."
		}
	    }
	}
	-re ".*$gdb_prompt $" {
	    perror "Dir \"$subdir\" failed."
	}
    }
}

#
# gdb_exit -- exit the GDB, killing the target program if necessary
#
proc default_gdb_exit {} {
    global GDB
    global GDBFLAGS
    global verbose
    global gdb_spawn_id

    if ![info exists gdb_spawn_id] {
	return;
    }

    verbose "Quitting $GDB $GDBFLAGS"

    # This used to be 1 for unix-gdb.exp
    set timeout 5
    verbose "Timeout is now $timeout seconds" 2

    if [is_remote host] {
	send_gdb "quit\n";
	gdb_expect {
	     -re ".*and kill it.*y or n. " {
		send_gdb "y\n";
		exp_continue;
	    }
	     timeout { }
	}
    } else {
	# We used to try to send_gdb "quit" to GDB, and wait for it to die.
	# Dealing with all the cases and errors got pretty hairy.  Just close it, 
	# that is simpler.
	catch "close "

	# Omitting this probably would cause strange timing-dependent failures.
	catch "wait "
    }

    remote_close host;
    unset gdb_spawn_id
}

#
# load a file into the debugger.
# return a -1 if anything goes wrong.
#
proc gdb_file_cmd { arg } {
    global verbose
    global loadpath
    global loadfile
    global GDB
    global gdb_prompt
    upvar timeout timeout
    global gdb_spawn_id
    set spawn_id $gdb_spawn_id

    if [is_remote host] {
	set arg [remote_download host $arg];
	if { $arg == "" } {
	    error "download failed"
	    return -1;
	}
    }

    send_gdb "file $arg\n"
    gdb_expect {
        -re "Reading symbols from.*done.*$gdb_prompt $" {
            verbose "\t\tLoaded $arg into the $GDB"
            return 0
        }
        -re "has no symbol-table.*$gdb_prompt $" {
            perror "$arg wasn't compiled with \"-g\""
            return -1
        }
        -re "A program is being debugged already.*Kill it.*y or n. $" {
            send_gdb "y\n"
                verbose "\t\tKilling previous program being debugged"
            exp_continue
        }
        -re "Load new symbol table from \".*\".*y or n. $" {
            send_gdb "y\n"
            gdb_expect {
                -re "Reading symbols from.*done.*$gdb_prompt $" {
                    verbose "\t\tLoaded $arg with new symbol table into $GDB"
                    return 0
                }
                timeout {
                    perror "(timeout) Couldn't load $arg, other program already loaded."
                    return -1
                }
            }
	}
        -re ".*No such file or directory.*$gdb_prompt $" {
            perror "($arg) No such file or directory\n"
            return -1
        }
        -re "$gdb_prompt $" {
            perror "couldn't load $arg into $GDB."
            return -1
            }
        timeout {
            perror "couldn't load $arg into $GDB (timed out)."
            return -1
        }
        eof {
            # This is an attempt to detect a core dump, but seems not to
            # work.  Perhaps we need to match .* followed by eof, in which
            # gdb_expect does not seem to have a way to do that.
            perror "couldn't load $arg into $GDB (end of file)."
            return -1
        }
    }
}

#
# start gdb -- start gdb running, default procedure
#
# When running over NFS, particularly if running many simultaneous
# tests on different hosts all using the same server, things can
# get really slow.  Give gdb at least 3 minutes to start up.
#
proc default_gdb_start { } {
    global verbose
    global GDB
    global GDBFLAGS
    global gdb_prompt
    global timeout
    global gdb_spawn_id
    global spawn_id
    verbose "Spawning $GDB -nw $GDBFLAGS"

    if [info exists gdb_spawn_id] {
	return 0;
    }

    set oldtimeout $timeout
    set timeout [expr "$timeout + 180"]
    if [is_remote host] {
	set shell_id [remote_spawn host "$GDB -nw $GDBFLAGS --command gdbinit"]
    } else {
	if { [which $GDB] == 0 } then {
	    perror "$GDB does not exist."
	    exit 1
	}

	set shell_id [remote_spawn host "$GDB -nw $GDBFLAGS"]
    }
    verbose $shell_id
    set timeout 10
    expect {
	-i $shell_id -re ".*\[\r\n\]$gdb_prompt $" {
	    verbose "GDB initialized."
	}
	-i $shell_id -re "$gdb_prompt $"	{
	    perror "GDB never initialized."
	    set timeout $oldtimeout
	    verbose "Timeout restored to $timeout seconds" 2
	    return -1
	}
	-i $shell_id timeout		{
	    perror "(timeout) GDB never initialized after $timeout seconds."
	    set timeout $oldtimeout
	    verbose "Timeout restored to $timeout seconds" 2
	    return -1
	}
    }
    set timeout $oldtimeout
    verbose "Timeout restored to $timeout seconds" 2
    set gdb_spawn_id $shell_id
    set spawn_id $gdb_spawn_id
    # force the height to "unlimited", so no pagers get used

    send_gdb "set height 0\n"
    gdb_expect {
	-re ".*$gdb_prompt $" { 
	    verbose "Setting height to 0." 2
	}
	timeout {
	    warning "Couldn't set the height to 0"
	}
    }
    # force the width to "unlimited", so no wraparound occurs
    send_gdb "set width 0\n"
    gdb_expect {
	-re ".*$gdb_prompt $" {
	    verbose "Setting width to 0." 2
	}
	timeout {
	    warning "Couldn't set the width to 0."
	}
    }
    return 0;
}

#
# FIXME: this is a copy of the new library procedure, but it's here too
# till the new dejagnu gets installed everywhere. I'd hate to break the
# gdb testsuite.
#
global argv0
if ![info exists argv0] then {
    proc exp_continue { } {
	continue -expect
    }
}

# * For crosses, the CHILL runtime doesn't build because it can't find
# setjmp.h, stdio.h, etc.
# * For AIX (as of 16 Mar 95), (a) there is no language code for
# CHILL in output_epilog in gcc/config/rs6000/rs6000.c, (b) collect2
# does not get along with AIX's too-clever linker.
# * On Irix5, there is a bug whereby set of bool, etc., don't get
# TYPE_LOW_BOUND for the bool right because force_to_range_type doesn't
# work with stub types.
# Lots of things seem to fail on the PA, and since it's not a supported
# chill target at the moment, don't run the chill tests.

proc skip_chill_tests {} {
    if ![info exists do_chill_tests] {
	return 1;
    }
    eval set skip_chill [expr ![isnative] || [istarget "*-*-aix*"] || [istarget "*-*-irix5*"] || [istarget "*-*-irix6*"] || [istarget "alpha-*-osf*"] || [istarget "hppa*-*-*"]]
    verbose "Skip chill tests is $skip_chill"
    return $skip_chill
}

proc get_compiler_info {binfile} {
    # Create and source the file that provides information about the compiler
    # used to compile the test case.
    global srcdir
    global subdir
    # These two come from compiler.c.
    global signed_keyword_not_used
    global gcc_compiled

    if { [gdb_compile "${srcdir}/${subdir}/compiler.c" "${binfile}.ci" preprocess {}] != "" } {
	perror "Couldn't make ${binfile}.ci file"
	return 1;
    }
    source ${binfile}.ci
    return 0;
}

proc gdb_compile {source dest type options} {
    if [target_info exists gdb_stub] {
	set options2 { "additional_flags=-Dusestubs" }
	lappend options "libs=[target_info gdb_stub]";
	set options [concat $options2 $options]
    }
    verbose "options are $options"
    verbose "source is $source $dest $type $options"
    set result [target_compile $source $dest $type $options];
    regsub "\[\r\n\]*$" "$result" "" result;
    regsub "^\[\r\n\]*" "$result" "" result;
    if { $result != "" } {
	clone_output "gdb compile failed, $result"
    }
    return $result;
}

proc send_gdb { string } {
    return [remote_send host "$string"];
}

#
# Basically the same as TCL expect, but with a big difference: it will
# call the eof/timeout/default section if there is an error in the
# expect call.
# Also adds a -i $gdb_spawn_id to each expect statement.
#

proc gdb_expect { args } {
    global gdb_spawn_id;
    global errorInfo errorCode;

    if { [llength $args] == 1 } {
	set args "[lindex $args 0]";
    }

    set res {}
    set got_re 0;
    set need_append 1;
    
    set orig "$args";

    set error_sect "";
    set save_next 0;

    for { set i 0; } { $i < [llength $args] } { incr i ; }  {
	if { $need_append } {
	    append res "\n-i $gdb_spawn_id ";
	    set need_append 0;
	}

	set x "[lrange $args $i $i]";
	regsub "^\n*\[ 	\]*" "$x" "" x;

	if { $x == "-i" || $x == "-timeout" || $x == "-ex" } {
	    append res "$x ";
	    set next [expr ${i}+1];
	    append res "[lrange $args $next $next]";
	    incr i;
	    continue;
	}
	if { $x == "-n" || $x == "-notransfer" || $x == "-nocase" || $x == "-indices" } {
	    append res "${x} ";
	    continue;
	}
	if { $x == "-re" } {
	    append res "${x} ";
	    set next [expr ${i}+1];
	    set y [lrange $args $next $next];
	    append res "${y} ";
	    set got_re 1;
	    incr i;
	    continue;
	}
	if { $got_re } {
	    set need_append 1;
	    append res "$x ";
	    set got_re 0;
	    if { $save_next } {
		set save_next 0;
		set error_sect [lindex $args $i];
	    }
	} else {
	    if { ${x} == "eof" } {
		set save_next 1;
	    } elseif { ${x} == "default" || ${x} == "timeout" } {
		if { $error_sect == "" } {
		    set save_next 1;
		}
	    }
	    append res "${x} ";
	    set got_re 1;
	}
    }

    set body "expect [list $res]";

    set code [catch {uplevel $body} string];

    if {$code == 1} {
	if { $error_sect != "" } {
	    set code [catch {uplevel $error_sect} string];
	} else {
	    perror "uh, gdb_expect statement without a default case?!";
	    return;
	}
    }

    if {$code == 1} {
	return -code error -errorinfo $errorInfo -errorcode $errorCode $string
    } elseif {$code == 2} {
	return -code return $string
    } elseif {$code == 3} {
	return
    } elseif {$code > 4} {
	return -code $code $string
    }
}

proc gdb_start { } {
    default_gdb_start
}

proc gdb_exit { } {
    catch default_gdb_exit
}

#
# gdb_load -- load a file into the debugger.
#             return a -1 if anything goes wrong.
#
proc gdb_load { arg } {
    return [gdb_file_cmd $arg]
}

proc gdb_continue { function } {
    global decimal

    return [gdb_test "continue" ".*Breakpoint $decimal, $function .*" "continue to $function"];
}

proc gdb_init { args } {
    if { [llength $args] > 0 } {
	global pf_prefix

	set file [lindex $args 0];

	set pf_prefix "[file tail [file dirname $file]]/[file tail $file]:";
    }
}

proc gdb_finish { } {
    gdb_exit;
}