# Copyright 1992-2015 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/>.

# 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.

if {$tool == ""} {
    # Tests would fail, logs on get_compiler_info() would be missing.
    send_error "`site.exp' not found, run `make site.exp'!\n"
    exit 2
}

load_lib libgloss.exp
load_lib cache.exp
load_lib gdb-utils.exp

global GDB

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

# GDBFLAGS is available for the user to set on the command line.
# E.g. make check RUNTESTFLAGS=GDBFLAGS=mumble
# Testcases may use it to add additional flags, but they must:
# - append new flags, not overwrite
# - restore the original value when done
global GDBFLAGS
if ![info exists GDBFLAGS] {
    set GDBFLAGS ""
}
verbose "using GDBFLAGS = $GDBFLAGS" 2

# Make the build data directory available to tests.
set BUILD_DATA_DIRECTORY "[pwd]/../data-directory"

# INTERNAL_GDBFLAGS contains flags that the testsuite requires.
global INTERNAL_GDBFLAGS
if ![info exists INTERNAL_GDBFLAGS] {
    set INTERNAL_GDBFLAGS "-nw -nx -data-directory $BUILD_DATA_DIRECTORY"
}

# The variable gdb_prompt is a regexp which matches the gdb prompt.
# Set it if it is not already set.  This is also set by default_gdb_init
# but it's not clear what removing one of them will break.
# See with_gdb_prompt for more details on prompt handling.
global gdb_prompt
if ![info exists gdb_prompt] then {
    set gdb_prompt "\\(gdb\\)"
}

# A regexp that matches the pagination prompt.
set pagination_prompt [string_to_regexp "---Type <return> to continue, or q <return> to quit---"]

# The variable fullname_syntax_POSIX is a regexp which matches a POSIX 
# absolute path ie. /foo/ 
set fullname_syntax_POSIX {/[^\n]*/}
# The variable fullname_syntax_UNC is a regexp which matches a Windows 
# UNC path ie. \\D\foo\ 
set fullname_syntax_UNC {\\\\[^\\]+\\[^\n]+\\}
# The variable fullname_syntax_DOS_CASE is a regexp which matches a 
# particular DOS case that GDB most likely will output
# ie. \foo\, but don't match \\.*\ 
set fullname_syntax_DOS_CASE {\\[^\\][^\n]*\\}
# The variable fullname_syntax_DOS is a regexp which matches a DOS path
# ie. a:\foo\ && a:foo\ 
set fullname_syntax_DOS {[a-zA-Z]:[^\n]*\\}
# The variable fullname_syntax is a regexp which matches what GDB considers
# an absolute path. It is currently debatable if the Windows style paths 
# d:foo and \abc should be considered valid as an absolute path.
# Also, the purpse of this regexp is not to recognize a well formed 
# absolute path, but to say with certainty that a path is absolute.
set fullname_syntax "($fullname_syntax_POSIX|$fullname_syntax_UNC|$fullname_syntax_DOS_CASE|$fullname_syntax_DOS)"

# Needed for some tests under Cygwin.
global EXEEXT
global env

if ![info exists env(EXEEXT)] {
    set EXEEXT ""
} else {
    set EXEEXT $env(EXEEXT)
}

set octal "\[0-7\]+"

set inferior_exited_re "(\\\[Inferior \[0-9\]+ \\(.*\\) exited)"

### Only procedures should come after this point.

#
# gdb_version -- extract and print the version number of GDB
#
proc default_gdb_version {} {
    global GDB
    global INTERNAL_GDBFLAGS GDBFLAGS
    global gdb_prompt
    global inotify_pid

    if {[info exists inotify_pid]} {
	eval exec kill $inotify_pid
    }

    set output [remote_exec host "$GDB $INTERNAL_GDBFLAGS --version"]
    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 $INTERNAL_GDBFLAGS $GDBFLAGS\n"
    } else {
	clone_output "$GDB on remote host version $version $INTERNAL_GDBFLAGS $GDBFLAGS\n"
    }
}

proc gdb_version { } {
    return [default_gdb_version]
}

#
# gdb_unload -- unload a file if one is loaded
# Return 0 on success, -1 on error.
#

proc gdb_unload {} {
    global verbose
    global GDB
    global gdb_prompt
    send_gdb "file\n"
    gdb_expect 60 {
	-re "No executable file now\[^\r\n\]*\[\r\n\]" { exp_continue }
	-re "No symbol file now\[^\r\n\]*\[\r\n\]" { exp_continue }
	-re "A program is being debugged already.*Are you sure you want to change the file.*y or n. $" {
	    send_gdb "y\n"
	    exp_continue
	}
	-re "Discard symbol table from .*y or n.*$" {
	    send_gdb "y\n"
	    exp_continue
	}
	-re "$gdb_prompt $" {}
	timeout {
	    perror "couldn't unload file in $GDB (timeout)."
	    return -1
	}
    }
    return 0
}

# 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

    # we need a larger timeout value here or this thing just confuses
    # itself.  May need a better implementation if possible. - guo
    #
    set timeout 100

    set msg "delete all breakpoints in delete_breakpoints"
    set deleted 0
    gdb_test_multiple "delete breakpoints" "$msg" {
	-re "Delete all breakpoints.*y or n.*$" {
	    send_gdb "y\n"
	    exp_continue
	}
	-re "$gdb_prompt $" {
	    set deleted 1
	}
    }

    if {$deleted} {
	# Confirm with "info breakpoints".
	set deleted 0
	set msg "info breakpoints"
	gdb_test_multiple $msg $msg {
	    -re "No breakpoints or watchpoints..*$gdb_prompt $" {
		set deleted 1
	    }
	    -re "$gdb_prompt $" {
	    }
	}
    }

    if {!$deleted} {
	perror "breakpoints not deleted"
    }
}

# 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.
#
# N.B. This function does not wait for gdb to return to the prompt,
# that is the caller's responsibility.

proc gdb_run_cmd {args} {
    global gdb_prompt use_gdb_stub

    foreach command [gdb_init_commands] {
	send_gdb "$command\n"
	gdb_expect 30 {
	    -re "$gdb_prompt $" { }
	    default {
		perror "gdb_init_command for target failed"
		return
	    }
	}
    }

    if $use_gdb_stub {
	if [target_info exists gdb,do_reload_on_run] {
	    if { [gdb_reload] != 0 } {
		return
	    }
	    send_gdb "continue\n"
	    gdb_expect 60 {
		-re "Continu\[^\r\n\]*\[\r\n\]" {}
		default {}
	    }
	    return
	}

	if [target_info exists gdb,start_symbol] {
	    set start [target_info gdb,start_symbol]
	} else {
	    set start "start"
	}
	send_gdb  "jump *$start\n"
	set start_attempt 1
	while { $start_attempt } {
	    # Cap (re)start attempts at three to ensure that this loop
	    # always eventually fails.  Don't worry about trying to be
	    # clever and not send a command when it has failed.
	    if [expr $start_attempt > 3] {
		perror "Jump to start() failed (retry count exceeded)"
		return
	    }
	    set start_attempt [expr $start_attempt + 1]
	    gdb_expect 30 {
		-re "Continuing at \[^\r\n\]*\[\r\n\]" {
		    set start_attempt 0
		}
		-re "No symbol \"_start\" in current.*$gdb_prompt $" {
		    perror "Can't find start symbol to run in gdb_run"
		    return
		}
		-re "No symbol \"start\" in current.*$gdb_prompt $" {
		    send_gdb "jump *_start\n"
		}
		-re "No symbol.*context.*$gdb_prompt $" {
		    set start_attempt 0
		}
		-re "Line.* Jump anyway.*y or n. $" {
		    send_gdb "y\n"
		}
		-re "The program is not being run.*$gdb_prompt $" {
		    if { [gdb_reload] != 0 } {
			return
		    }
		    send_gdb "jump *$start\n"
		}
		timeout {
		    perror "Jump to start() failed (timeout)"
		    return
		}
	    }
	}
	return
    }

    if [target_info exists gdb,do_reload_on_run] {
	if { [gdb_reload] != 0 } {
	    return
	}
    }
    send_gdb "run $args\n"
# This doesn't work quite right yet.
# Use -notransfer here so that test cases (like chng-sym.exp)
# may test for additional start-up messages.
   gdb_expect 60 {
	-re "The program .* has been started already.*y or n. $" {
	    send_gdb "y\n"
	    exp_continue
	}
	-notransfer -re "Starting program: \[^\r\n\]*" {}
	-notransfer -re "$gdb_prompt $" {
	    # There is no more input expected.
	}
    }
}

# Generic start command.  Return 0 if we could start the program, -1
# if we could not.
#
# N.B. This function does not wait for gdb to return to the prompt,
# that is the caller's responsibility.

proc gdb_start_cmd {args} {
    global gdb_prompt use_gdb_stub

    foreach command [gdb_init_commands] {
	send_gdb "$command\n"
	gdb_expect 30 {
	    -re "$gdb_prompt $" { }
	    default {
		perror "gdb_init_command for target failed"
		return -1
	    }
	}
    }

    if $use_gdb_stub {
	return -1
    }

    send_gdb "start $args\n"
    # Use -notransfer here so that test cases (like chng-sym.exp)
    # may test for additional start-up messages.
    gdb_expect 60 {
	-re "The program .* has been started already.*y or n. $" {
	    send_gdb "y\n"
	    exp_continue
	}
	-notransfer -re "Starting program: \[^\r\n\]*" {
	    return 0
	}
    }
    return -1
}

# Set a breakpoint at FUNCTION.  If there is an additional argument it is
# a list of options; the supported options are allow-pending, temporary,
# message, no-message, and passfail.
# The result is 1 for success, 0 for failure.
#
# Note: The handling of message vs no-message is messed up, but it's based
# on historical usage.  By default this function does not print passes,
# only fails.
# no-message: turns off printing of fails (and passes, but they're already off)
# message: turns on printing of passes (and fails, but they're already on)

proc gdb_breakpoint { function args } {
    global gdb_prompt
    global decimal

    set pending_response n
    if {[lsearch -exact $args allow-pending] != -1} {
	set pending_response y
    }

    set break_command "break"
    set break_message "Breakpoint"
    if {[lsearch -exact $args temporary] != -1} {
	set break_command "tbreak"
	set break_message "Temporary breakpoint"
    }

    set print_pass 0
    set print_fail 1
    set no_message_loc [lsearch -exact $args no-message]
    set message_loc [lsearch -exact $args message]
    # The last one to appear in args wins.
    if { $no_message_loc > $message_loc } {
	set print_fail 0
    } elseif { $message_loc > $no_message_loc } {
	set print_pass 1
    }

    set test_name "setting breakpoint at $function"

    send_gdb "$break_command $function\n"
    # The first two regexps are what we get with -g, the third is without -g.
    gdb_expect 30 {
	-re "$break_message \[0-9\]* at .*: file .*, line $decimal.\r\n$gdb_prompt $" {}
	-re "$break_message \[0-9\]*: file .*, line $decimal.\r\n$gdb_prompt $" {}
	-re "$break_message \[0-9\]* at .*$gdb_prompt $" {}
	-re "$break_message \[0-9\]* \\(.*\\) pending.*$gdb_prompt $" {
		if {$pending_response == "n"} {
			if { $print_fail } {
				fail $test_name
			}
			return 0
		}
	}
	-re "Make breakpoint pending.*y or \\\[n\\\]. $" { 
		send_gdb "$pending_response\n"
		exp_continue
	}
	-re "A problem internal to GDB has been detected" {
		if { $print_fail } {
		    fail "$test_name (GDB internal error)"
		}
		gdb_internal_error_resync
		return 0
	}
	-re "$gdb_prompt $" {
		if { $print_fail } {
			fail $test_name
		}
		return 0
	}
	eof {
		if { $print_fail } {
			fail "$test_name (eof)"
		}
		return 0
	}
	timeout {
		if { $print_fail } {
			fail "$test_name (timeout)"
		}
		return 0
	}
    }
    if { $print_pass } {
	pass $test_name
    }
    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.
#
# If there are additional arguments, pass them to gdb_breakpoint.
# We recognize no-message/message ourselves.
# The default is no-message.
# no-message is messed up here, like gdb_breakpoint: to preserve
# historical usage fails are always printed by default.
# no-message: turns off printing of fails (and passes, but they're already off)
# message: turns on printing of passes (and fails, but they're already on)

proc runto { function args } {
    global gdb_prompt
    global decimal

    delete_breakpoints

    # Default to "no-message".
    set args "no-message $args"

    set print_pass 0
    set print_fail 1
    set no_message_loc [lsearch -exact $args no-message]
    set message_loc [lsearch -exact $args message]
    # The last one to appear in args wins.
    if { $no_message_loc > $message_loc } {
	set print_fail 0
    } elseif { $message_loc > $no_message_loc } {
	set print_pass 1
    }

    set test_name "running to $function in runto"

    # We need to use eval here to pass our varargs args to gdb_breakpoint
    # which is also a varargs function.
    # But we also have to be careful because $function may have multiple
    # elements, and we don't want Tcl to move the remaining elements after
    # the first to $args.  That is why $function is wrapped in {}.
    if ![eval gdb_breakpoint {$function} $args] {
	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 30 {
	-re "Break.* at .*:$decimal.*$gdb_prompt $" {
	    if { $print_pass } {
		pass $test_name
	    }
	    return 1
	}
	-re "Breakpoint \[0-9\]*, \[0-9xa-f\]* in .*$gdb_prompt $" { 
	    if { $print_pass } {
		pass $test_name
	    }
	    return 1
	}
	-re "The target does not support running in non-stop mode.\r\n$gdb_prompt $" {
	    if { $print_fail } {
		unsupported "Non-stop mode not supported"
	    }
	    return 0
	}
	-re ".*A problem internal to GDB has been detected" {
	    if { $print_fail } {
		fail "$test_name (GDB internal error)"
	    }
	    gdb_internal_error_resync
	    return 0
	}
	-re "$gdb_prompt $" { 
	    if { $print_fail } {
		fail $test_name
	    }
	    return 0
	}
	eof { 
	    if { $print_fail } {
		fail "$test_name (eof)"
	    }
	    return 0
	}
	timeout { 
	    if { $print_fail } {
		fail "$test_name (timeout)"
	    }
	    return 0
	}
    }
    if { $print_pass } {
	pass $test_name
    }
    return 1
}

# Ask gdb to run until we hit a breakpoint at main.
#
# N.B. This function deletes all existing breakpoints.
# If you don't want that, use gdb_start_cmd.

proc runto_main { } {
    return [runto main no-message]
}

### Continue, and expect to hit a breakpoint.
### Report a pass or fail, depending on whether it seems to have
### worked.  Use NAME as part of the test name; each call to
### continue_to_breakpoint should use a NAME which is unique within
### that test file.
proc gdb_continue_to_breakpoint {name {location_pattern .*}} {
    global gdb_prompt
    set full_name "continue to breakpoint: $name"

    gdb_test_multiple "continue" $full_name {
	-re "(?:Breakpoint|Temporary breakpoint) .* (at|in) $location_pattern\r\n$gdb_prompt $" {
	    pass $full_name
	}
    }
}


# gdb_internal_error_resync:
#
# Answer the questions GDB asks after it reports an internal error
# until we get back to a GDB prompt.  Decline to quit the debugging
# session, and decline to create a core file.  Return non-zero if the
# resync succeeds.
#
# This procedure just answers whatever questions come up until it sees
# a GDB prompt; it doesn't require you to have matched the input up to
# any specific point.  However, it only answers questions it sees in
# the output itself, so if you've matched a question, you had better
# answer it yourself before calling this.
#
# You can use this function thus:
#
# gdb_expect {
#     ...
#     -re ".*A problem internal to GDB has been detected" {
#         gdb_internal_error_resync
#     }
#     ...
# }
#
proc gdb_internal_error_resync {} {
    global gdb_prompt

    verbose -log "Resyncing due to internal error."

    set count 0
    while {$count < 10} {
	gdb_expect {
	    -re "Quit this debugging session\\? \\(y or n\\) $" {
		send_gdb "n\n"
		incr count
	    }
	    -re "Create a core file of GDB\\? \\(y or n\\) $" {
		send_gdb "n\n"
		incr count
	    }
	    -re "$gdb_prompt $" {
		# We're resynchronized.
		return 1
	    }
	    timeout {
		perror "Could not resync from internal error (timeout)"
		return 0
	    }
	}
    }
    perror "Could not resync from internal error (resync count exceeded)"
    return 0
}


# gdb_test_multiple COMMAND MESSAGE EXPECT_ARGUMENTS
# Send a command to gdb; test the result.
#
# COMMAND is the command to execute, send to GDB with send_gdb.  If
#   this is the null string no command is sent.
# MESSAGE is a message to be printed with the built-in failure patterns
#   if one of them matches.  If MESSAGE is empty COMMAND will be used.
# EXPECT_ARGUMENTS will be fed to expect in addition to the standard
#   patterns.  Pattern elements will be evaluated in the caller's
#   context; action elements will be executed in the caller's context.
#   Unlike patterns for gdb_test, these patterns should generally include
#   the final newline and prompt.
#
# Returns:
#    1 if the test failed, according to a built-in failure pattern
#    0 if only user-supplied patterns matched
#   -1 if there was an internal error.
#  
# You can use this function thus:
#
# gdb_test_multiple "print foo" "test foo" {
#    -re "expected output 1" {
#        pass "print foo"
#    }
#    -re "expected output 2" {
#        fail "print foo"
#    }
# }
#
# The standard patterns, such as "Inferior exited..." and "A problem
# ...", all being implicitly appended to that list.
#
proc gdb_test_multiple { command message user_code } {
    global verbose use_gdb_stub
    global gdb_prompt pagination_prompt
    global GDB
    global inferior_exited_re
    upvar timeout timeout
    upvar expect_out expect_out

    if { $message == "" } {
	set message $command
    }

    if [string match "*\[\r\n\]" $command] {
	error "Invalid trailing newline in \"$message\" test"
    }

    if [string match "*\[\r\n\]*" $message] {
	error "Invalid newline in \"$message\" test"
    }

    if {$use_gdb_stub
	&& [regexp -nocase {^\s*(r|run|star|start|at|att|atta|attac|attach)\M} \
	    $command]} {
	error "gdbserver does not support $command without extended-remote"
    }

    # TCL/EXPECT WART ALERT
    # Expect does something very strange when it receives a single braced
    # argument.  It splits it along word separators and performs substitutions.
    # This means that { "[ab]" } is evaluated as "[ab]", but { "\[ab\]" } is
    # evaluated as "\[ab\]".  But that's not how TCL normally works; inside a
    # double-quoted list item, "\[ab\]" is just a long way of representing
    # "[ab]", because the backslashes will be removed by lindex.

    # Unfortunately, there appears to be no easy way to duplicate the splitting
    # that expect will do from within TCL.  And many places make use of the
    # "\[0-9\]" construct, so we need to support that; and some places make use
    # of the "[func]" construct, so we need to support that too.  In order to
    # get this right we have to substitute quoted list elements differently
    # from braced list elements.

    # We do this roughly the same way that Expect does it.  We have to use two
    # lists, because if we leave unquoted newlines in the argument to uplevel
    # they'll be treated as command separators, and if we escape newlines
    # we mangle newlines inside of command blocks.  This assumes that the
    # input doesn't contain a pattern which contains actual embedded newlines
    # at this point!

    regsub -all {\n} ${user_code} { } subst_code
    set subst_code [uplevel list $subst_code]

    set processed_code ""
    set patterns ""
    set expecting_action 0
    set expecting_arg 0
    foreach item $user_code subst_item $subst_code {
	if { $item == "-n" || $item == "-notransfer" || $item == "-nocase" } {
	    lappend processed_code $item
	    continue
	}
	if { $item == "-indices" || $item == "-re" || $item == "-ex" } {
	    lappend processed_code $item
	    continue
	}
	if { $item == "-timeout" } {
	    set expecting_arg 1
	    lappend processed_code $item
	    continue
	}
	if { $expecting_arg } {
	    set expecting_arg 0
	    lappend processed_code $item
	    continue
	}
	if { $expecting_action } {
	    lappend processed_code "uplevel [list $item]"
	    set expecting_action 0
	    # Cosmetic, no effect on the list.
	    append processed_code "\n"
	    continue
	}
	set expecting_action 1
	lappend processed_code $subst_item
	if {$patterns != ""} {
	    append patterns "; "
	}
	append patterns "\"$subst_item\""
    }

    # Also purely cosmetic.
    regsub -all {\r} $patterns {\\r} patterns
    regsub -all {\n} $patterns {\\n} patterns

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

    set result -1
    set string "${command}\n"
    if { $command != "" } {
	set multi_line_re "\[\r\n\] *>"
	while { "$string" != "" } {
	    set foo [string first "\n" "$string"]
	    set len [string length "$string"]
	    if { $foo < [expr $len - 1] } {
		set str [string range "$string" 0 $foo]
		if { [send_gdb "$str"] != "" } {
		    global suppress_flag

		    if { ! $suppress_flag } {
			perror "Couldn't send $command to GDB."
		    }
		    fail "$message"
		    return $result
		}
		# since we're checking if each line of the multi-line
		# command are 'accepted' by GDB here,
		# we need to set -notransfer expect option so that
		# command output is not lost for pattern matching
		# - guo
		gdb_expect 2 {
		    -notransfer -re "$multi_line_re$" { verbose "partial: match" 3 }
		    timeout { verbose "partial: timeout" 3 }
		}
		set string [string range "$string" [expr $foo + 1] end]
		set multi_line_re "$multi_line_re.*\[\r\n\] *>"
	    } else {
		break
	    }
	}
	if { "$string" != "" } {
	    if { [send_gdb "$string"] != "" } {
		global suppress_flag

		if { ! $suppress_flag } {
		    perror "Couldn't send $command to GDB."
		}
		fail "$message"
		return $result
	    }
	}
    }

    set code {
	-re ".*A problem internal to GDB has been detected" {
	    fail "$message (GDB internal error)"
	    gdb_internal_error_resync
	    set result -1
	}
	-re "\\*\\*\\* DOSEXIT code.*" {
	    if { $message != "" } {
		fail "$message"
	    }
	    gdb_suppress_entire_file "GDB died"
	    set result -1
	}
    }
    append code $processed_code
    append code {
	-re "Ending remote debugging.*$gdb_prompt $" {
	    if ![isnative] then {
		warning "Can`t communicate to remote target."
	    }
	    gdb_exit
	    gdb_start
	    set result -1
	}
	-re "Undefined\[a-z\]* command:.*$gdb_prompt $" {
	    perror "Undefined command \"$command\"."
	    fail "$message"
	    set result 1
	}
	-re "Ambiguous command.*$gdb_prompt $" {
	    perror "\"$command\" is not a unique command name."
	    fail "$message"
	    set result 1
	}
	-re "$inferior_exited_re 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"
	    set result -1
	}
	-re "$inferior_exited_re normally.*$gdb_prompt $" {
	    if ![string match "" $message] then {
		set errmsg "$message (the program exited)"
	    } else {
		set errmsg "$command (the program exited)"
	    }
	    fail "$errmsg"
	    set result -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"
	    set result -1
	}
	-re "\r\n$gdb_prompt $" {
	    if ![string match "" $message] then {
		fail "$message"
	    }
	    set result 1
	}
	-re "$pagination_prompt" {
	    send_gdb "\n"
	    perror "Window too small."
	    fail "$message"
	    set result -1
	}
	-re "\\((y or n|y or \\\[n\\\]|\\\[y\\\] or n)\\) " {
	    send_gdb "n\n"
	    gdb_expect -re "$gdb_prompt $"
	    fail "$message (got interactive prompt)"
	    set result -1
	}
	-re "\\\[0\\\] cancel\r\n\\\[1\\\] all.*\r\n> $" {
	    send_gdb "0\n"
	    gdb_expect -re "$gdb_prompt $"
	    fail "$message (got breakpoint menu)"
	    set result -1
	}
	eof {
	    perror "Process no longer exists"
	    if { $message != "" } {
		fail "$message"
	    }
	    return -1
	}
	full_buffer {
	    perror "internal buffer is full."
	    fail "$message"
	    set result -1
	}
	timeout	{
	    if ![string match "" $message] then {
		fail "$message (timeout)"
	    }
	    set result 1
	}
    }

    set result 0
    set code [catch {gdb_expect $code} string]
    if {$code == 1} {
	global errorInfo errorCode
	return -code error -errorinfo $errorInfo -errorcode $errorCode $string
    } elseif {$code > 1} {
	return -code $code $string
    }
    return $result
}

# gdb_test COMMAND PATTERN MESSAGE QUESTION RESPONSE
# Send a command to gdb; test the result.
#
# COMMAND is the command to execute, send to GDB with send_gdb.  If
#   this is the null string no command is sent.
# PATTERN is the pattern to match for a PASS, and must NOT include
#   the \r\n sequence immediately before the gdb prompt.
# MESSAGE is an optional message to be printed.  If this is
#   omitted, then the pass/fail messages use the command string as the
#   message.  (If this is the empty string, then sometimes we don't
#   call pass or fail at all; I don't understand this at all.)
# QUESTION is a question GDB may ask in response to COMMAND, like
#   "are you sure?"
# RESPONSE is the response to send if QUESTION appears.
#
# 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
    upvar timeout timeout

    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 $args 4]
    } else {
	set question_string "^FOOBAR$"
    }

    return [gdb_test_multiple $command $message {
	-re "\[\r\n\]*($pattern)\[\r\n\]+$gdb_prompt $" {
	    if ![string match "" $message] then {
		pass "$message"
            }
        }
	-re "(${question_string})$" {
	    send_gdb "$response_string\n"
	    exp_continue
	}
     }]
}

# gdb_test_no_output COMMAND MESSAGE
# Send a command to GDB and verify that this command generated no output.
#
# See gdb_test_multiple for a description of the COMMAND and MESSAGE
# parameters.  If MESSAGE is ommitted, then COMMAND will be used as
# the message.  (If MESSAGE is the empty string, then sometimes we do not
# call pass or fail at all; I don't understand this at all.)

proc gdb_test_no_output { args } {
    global gdb_prompt
    set command [lindex $args 0]
    if [llength $args]>1 then {
	set message [lindex $args 1]
    } else {
	set message $command
    }

    set command_regex [string_to_regexp $command]
    gdb_test_multiple $command $message {
        -re "^$command_regex\r\n$gdb_prompt $" {
	    if ![string match "" $message] then {
		pass "$message"
            }
        }
    }
}

# Send a command and then wait for a sequence of outputs.
# This is useful when the sequence is long and contains ".*", a single
# regexp to match the entire output can get a timeout much easier.
#
# COMMAND is the command to send.
# TEST_NAME is passed to pass/fail.  COMMAND is used if TEST_NAME is "".
# EXPECTED_OUTPUT_LIST is a list of regexps of expected output, which are
# processed in order, and all must be present in the output.
#
# It is unnecessary to specify ".*" at the beginning or end of any regexp,
# there is an implicit ".*" between each element of EXPECTED_OUTPUT_LIST.
# There is also an implicit ".*" between the last regexp and the gdb prompt.
#
# Like gdb_test and gdb_test_multiple, the output is expected to end with the
# gdb prompt, which must not be specified in EXPECTED_OUTPUT_LIST.
#
# Returns:
#    1 if the test failed,
#    0 if the test passes,
#   -1 if there was an internal error.

proc gdb_test_sequence { command test_name expected_output_list } {
    global gdb_prompt
    if { $test_name == "" } {
	set test_name $command
    }
    lappend expected_output_list ""; # implicit ".*" before gdb prompt
    send_gdb "$command\n"
    return [gdb_expect_list $test_name "$gdb_prompt $" $expected_output_list]
}


# 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"
    #FIXME: Should add timeout as parameter.
    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 $sendthis"
	    return 1
	}
        -re "Unmatched single quote.*$gdb_prompt $" {
            pass "reject $sendthis"
            return 1
        }
        -re "A character constant must contain at least one character.*$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
	}
    }
}


# 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]
}

# Wrapper around gdb_test_multiple that looks for a list of expected
# output elements, but which can appear in any order.
# CMD is the gdb command.
# NAME is the name of the test.
# ELM_FIND_REGEXP specifies how to partition the output into elements to
# compare.
# ELM_EXTRACT_REGEXP specifies the part of ELM_FIND_REGEXP to compare.
# RESULT_MATCH_LIST is a list of exact matches for each expected element.
# All elements of RESULT_MATCH_LIST must appear for the test to pass.
#
# A typical use of ELM_FIND_REGEXP/ELM_EXTRACT_REGEXP is to extract one line
# of text per element and then strip trailing \r\n's.
# Example:
# gdb_test_list_exact "foo" "bar" \
#    "\[^\r\n\]+\[\r\n\]+" \
#    "\[^\r\n\]+" \
#     { \
#	{expected result 1} \
#	{expected result 2} \
#     }

proc gdb_test_list_exact { cmd name elm_find_regexp elm_extract_regexp result_match_list } {
    global gdb_prompt

    set matches [lsort $result_match_list]
    set seen {}
    gdb_test_multiple $cmd $name {
	"$cmd\[\r\n\]" { exp_continue }
	-re $elm_find_regexp {
	    set str $expect_out(0,string)
	    verbose -log "seen: $str" 3
	    regexp -- $elm_extract_regexp $str elm_seen
	    verbose -log "extracted: $elm_seen" 3
	    lappend seen $elm_seen
	    exp_continue
	}
	-re "$gdb_prompt $" {
	    set failed ""
	    foreach got [lsort $seen] have $matches {
		if {![string equal $got $have]} {
		    set failed $have
		    break
		}
	    }
	    if {[string length $failed] != 0} {
		fail "$name ($failed not found)"
	    } else {
		pass $name
	    }
	}
    }
}


# Issue a PASS and return true if evaluating CONDITION in the caller's
# frame returns true, and issue a FAIL and return false otherwise.
# MESSAGE is the pass/fail message to be printed.  If MESSAGE is
# omitted or is empty, then the pass/fail messages use the condition
# string as the message.

proc gdb_assert { condition {message ""} } {
    if { $message == ""} {
	set message $condition
    }

    set res [uplevel 1 expr $condition]
    if {!$res} {
	fail $message
    } else {
	pass $message
    }
    return $res
}

proc gdb_reinitialize_dir { subdir } {
    global gdb_prompt

    if [is_remote host] {
	return ""
    }
    send_gdb "dir\n"
    gdb_expect 60 {
	-re "Reinitialize source path to empty.*y or n. " {
	    send_gdb "y\n"
	    gdb_expect 60 {
		-re "Source directories searched.*$gdb_prompt $" {
		    send_gdb "dir $subdir\n"
		    gdb_expect 60 {
			-re "Source directories searched.*$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 INTERNAL_GDBFLAGS GDBFLAGS
    global verbose
    global gdb_spawn_id
    global inotify_log_file

    gdb_stop_suppressing_tests

    if ![info exists gdb_spawn_id] {
	return
    }

    verbose "Quitting $GDB $INTERNAL_GDBFLAGS $GDBFLAGS"

    if {[info exists inotify_log_file] && [file exists $inotify_log_file]} {
	set fd [open $inotify_log_file]
	set data [read -nonewline $fd]
	close $fd

	if {[string compare $data ""] != 0} {
	    warning "parallel-unsafe file creations noticed"

	    # Clear the log.
	    set fd [open $inotify_log_file w]
	    close $fd
	}
    }

    if { [is_remote host] && [board_info host exists fileid] } {
	send_gdb "quit\n"
	gdb_expect 10 {
	    -re "y or n" {
		send_gdb "y\n"
		exp_continue
	    }
	    -re "DOSEXIT code" { }
	    default { }
	}
    }

    if ![is_remote host] {
	remote_close host
    }
    unset gdb_spawn_id
}

# Load a file into the debugger.
# The return value is 0 for success, -1 for failure.
#
# This procedure also set the global variable GDB_FILE_CMD_DEBUG_INFO
# to one of these values:
#
#   debug    file was loaded successfully and has debug information
#   nodebug  file was loaded successfully and has no debug information
#   lzma     file was loaded, .gnu_debugdata found, but no LZMA support
#            compiled in
#   fail     file was not loaded
#
# I tried returning this information as part of the return value,
# but ran into a mess because of the many re-implementations of
# gdb_load in config/*.exp.
#
# TODO: gdb.base/sepdebug.exp and gdb.stabs/weird.exp might be able to use
# this if they can get more information set.

proc gdb_file_cmd { arg } {
    global gdb_prompt
    global verbose
    global GDB
    global last_loaded_file

    # Save this for the benefit of gdbserver-support.exp.
    set last_loaded_file $arg

    # Set whether debug info was found.
    # Default to "fail".
    global gdb_file_cmd_debug_info
    set gdb_file_cmd_debug_info "fail"

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

    # The file command used to kill the remote target.  For the benefit
    # of the testsuite, preserve this behavior.
    send_gdb "kill\n"
    gdb_expect 120 {
	-re "Kill the program being debugged. .y or n. $" {
	    send_gdb "y\n"
	    verbose "\t\tKilling previous program being debugged"
	    exp_continue
	}
	-re "$gdb_prompt $" {
	    # OK.
	}
    }

    send_gdb "file $arg\n"
    gdb_expect 120 {
	-re "Reading symbols from.*LZMA support was disabled.*done.*$gdb_prompt $" {
	    verbose "\t\tLoaded $arg into $GDB; .gnu_debugdata found but no LZMA available"
	    set gdb_file_cmd_debug_info "lzma"
	    return 0
	}
	-re "Reading symbols from.*no debugging symbols found.*done.*$gdb_prompt $" {
	    verbose "\t\tLoaded $arg into $GDB with no debugging symbols"
	    set gdb_file_cmd_debug_info "nodebug"
	    return 0
	}
        -re "Reading symbols from.*done.*$gdb_prompt $" {
            verbose "\t\tLoaded $arg into $GDB"
	    set gdb_file_cmd_debug_info "debug"
	    return 0
        }
        -re "Load new symbol table from \".*\".*y or n. $" {
            send_gdb "y\n"
            gdb_expect 120 {
                -re "Reading symbols from.*done.*$gdb_prompt $" {
                    verbose "\t\tLoaded $arg with new symbol table into $GDB"
		    set gdb_file_cmd_debug_info "debug"
		    return 0
                }
                timeout {
                    perror "Couldn't load $arg, other program already loaded (timeout)."
		    return -1
                }
		eof {
		    perror "Couldn't load $arg, other program already loaded (eof)."
		    return -1
		}
            }
	}
        -re "No such file or directory.*$gdb_prompt $" {
            perror "($arg) No such file or directory"
	    return -1
        }
	-re "A problem internal to GDB has been detected" {
	    fail "($arg) (GDB internal error)"
	    gdb_internal_error_resync
	    return -1
	}
        -re "$gdb_prompt $" {
            perror "Couldn't load $arg into $GDB."
	    return -1
            }
        timeout {
            perror "Couldn't load $arg into $GDB (timeout)."
	    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 (eof)."
	    return -1
        }
    }
}

# Default gdb_spawn procedure.

proc default_gdb_spawn { } {
    global use_gdb_stub
    global GDB
    global INTERNAL_GDBFLAGS GDBFLAGS
    global gdb_spawn_id

    gdb_stop_suppressing_tests

    # Set the default value, it may be overriden later by specific testfile.
    #
    # Use `set_board_info use_gdb_stub' for the board file to flag the inferior
    # is already started after connecting and run/attach are not supported.
    # This is used for the "remote" protocol.  After GDB starts you should
    # check global $use_gdb_stub instead of the board as the testfile may force
    # a specific different target protocol itself.
    set use_gdb_stub [target_info exists use_gdb_stub]

    verbose "Spawning $GDB $INTERNAL_GDBFLAGS $GDBFLAGS"

    if [info exists gdb_spawn_id] {
	return 0
    }

    if ![is_remote host] {
	if { [which $GDB] == 0 } then {
	    perror "$GDB does not exist."
	    exit 1
	}
    }
    set res [remote_spawn host "$GDB $INTERNAL_GDBFLAGS $GDBFLAGS [host_info gdb_opts]"]
    if { $res < 0 || $res == "" } {
	perror "Spawning $GDB failed."
	return 1
    }

    set gdb_spawn_id $res
    return 0
}

# Default gdb_start procedure.

proc default_gdb_start { } {
    global gdb_prompt pagination_prompt
    global gdb_spawn_id

    if [info exists gdb_spawn_id] {
	return 0
    }

    set res [gdb_spawn]
    if { $res != 0} {
	return $res
    }

    # 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.
    set loop_again 1
    while { $loop_again } {
	set loop_again 0
	gdb_expect 360 {
	    -re "$pagination_prompt" {
		verbose "Hit pagination during startup. Pressing enter to continue."
		send_gdb "\n"
		set loop_again 1
	    }
	    -re "\[\r\n\]$gdb_prompt $" {
		verbose "GDB initialized."
	    }
	    -re "$gdb_prompt $"	{
		perror "GDB never initialized."
		unset gdb_spawn_id
		return -1
	    }
	    timeout	{
		perror "(timeout) GDB never initialized after 10 seconds."
		remote_close host
		unset gdb_spawn_id
		return -1
	    }
	}
    }

    # force the height to "unlimited", so no pagers get used

    send_gdb "set height 0\n"
    gdb_expect 10 {
	-re "$gdb_prompt $" { 
	    verbose "Setting height to 0." 2
	}
	timeout {
	    warning "Couldn't set the height to 0"
	}
    }
    # force the width to "unlimited", so no wraparound occurs
    send_gdb "set width 0\n"
    gdb_expect 10 {
	-re "$gdb_prompt $" {
	    verbose "Setting width to 0." 2
	}
	timeout {
	    warning "Couldn't set the width to 0."
	}
    }
    return 0
}

# Utility procedure to give user control of the gdb prompt in a script. It is
# meant to be used for debugging test cases, and should not be left in the
# test cases code.

proc gdb_interact { } {
    global gdb_spawn_id
    set spawn_id $gdb_spawn_id

    send_user "+------------------------------------------+\n"
    send_user "| Script interrupted, you can now interact |\n"
    send_user "| with by gdb. Type >>> to continue.       |\n"
    send_user "+------------------------------------------+\n"

    interact {
	">>>" return
    }
}

# Examine the output of compilation to determine whether compilation
# failed or not.  If it failed determine whether it is due to missing
# compiler or due to compiler error.  Report pass, fail or unsupported
# as appropriate

proc gdb_compile_test {src output} {
    if { $output == "" } {
	pass "compilation [file tail $src]"
    } elseif { [regexp {^[a-zA-Z_0-9]+: Can't find [^ ]+\.$} $output] } {
	unsupported "compilation [file tail $src]"
    } elseif { [regexp {.*: command not found[\r|\n]*$} $output] } {
	unsupported "compilation [file tail $src]"
    } elseif { [regexp {.*: [^\r\n]*compiler not installed[^\r\n]*[\r|\n]*$} $output] } {
	unsupported "compilation [file tail $src]"
    } else {
	verbose -log "compilation failed: $output" 2
	fail "compilation [file tail $src]"
    }
}

# Return a 1 for configurations for which we don't even want to try to
# test C++.

proc skip_cplus_tests {} {
    if { [istarget "h8300-*-*"] } {
	return 1
    }

    # The C++ IO streams are too large for HC11/HC12 and are thus not
    # available.  The gdb C++ tests use them and don't compile.
    if { [istarget "m6811-*-*"] } {
	return 1
    }
    if { [istarget "m6812-*-*"] } {
	return 1
    }
    return 0
}

# Return a 1 for configurations for which don't have both C++ and the STL.

proc skip_stl_tests {} {
    # Symbian supports the C++ language, but the STL is missing
    # (both headers and libraries).
    if { [istarget "arm*-*-symbianelf*"] } {
	return 1
    }

    return [skip_cplus_tests]
}

# Return a 1 if I don't even want to try to test FORTRAN.

proc skip_fortran_tests {} {
    return 0
}

# Return a 1 if I don't even want to try to test ada.

proc skip_ada_tests {} {
    return 0
}

# Return a 1 if I don't even want to try to test GO.

proc skip_go_tests {} {
    return 0
}

# Return a 1 if I don't even want to try to test java.

proc skip_java_tests {} {
    return 0
}

# Return a 1 if I don't even want to try to test D.

proc skip_d_tests {} {
    return 0
}

# Return a 1 for configurations that do not support Python scripting.

proc skip_python_tests {} {
    global gdb_prompt
    global gdb_py_is_py3k
    global gdb_py_is_py24

    gdb_test_multiple "python print ('test')" "verify python support" {
	-re "not supported.*$gdb_prompt $"	{
	    unsupported "Python support is disabled."
	    return 1
	}
	-re "$gdb_prompt $"	{}
    }

    set gdb_py_is_py24 0
    gdb_test_multiple "python print (sys.version_info\[0\])" "check if python 3" {
	-re "3.*$gdb_prompt $"	{
            set gdb_py_is_py3k 1
        }
	-re ".*$gdb_prompt $"	{
            set gdb_py_is_py3k 0
        }
    }
    if { $gdb_py_is_py3k == 0 } {
        gdb_test_multiple "python print (sys.version_info\[1\])" "check if python 2.4" {
	    -re "\[45\].*$gdb_prompt $" {
                set gdb_py_is_py24 1
            }
	    -re ".*$gdb_prompt $" {
                set gdb_py_is_py24 0
            }
        }
    }

    return 0
}

# Return a 1 if we should skip shared library tests.

proc skip_shlib_tests {} {
    # Run the shared library tests on native systems.
    if {[isnative]} {
	return 0
    }

    # An abbreviated list of remote targets where we should be able to
    # run shared library tests.
    if {([istarget *-*-linux*]
	 || [istarget *-*-*bsd*]
	 || [istarget *-*-solaris2*]
	 || [istarget arm*-*-symbianelf*]
	 || [istarget *-*-mingw*]
	 || [istarget *-*-cygwin*]
	 || [istarget *-*-pe*])} {
	return 0
    }

    return 1
}

# Test files shall make sure all the test result lines in gdb.sum are
# unique in a test run, so that comparing the gdb.sum files of two
# test runs gives correct results.  Test files that exercise
# variations of the same tests more than once, shall prefix the
# different test invocations with different identifying strings in
# order to make them unique.
#
# About test prefixes:
#
# $pf_prefix is the string that dejagnu prints after the result (FAIL,
# PASS, etc.), and before the test message/name in gdb.sum.  E.g., the
# underlined substring in
#
#  PASS: gdb.base/mytest.exp: some test
#        ^^^^^^^^^^^^^^^^^^^^
#
# is $pf_prefix.
#
# The easiest way to adjust the test prefix is to append a test
# variation prefix to the $pf_prefix, using the with_test_prefix
# procedure.  E.g.,
#
# proc do_tests {} {
#   gdb_test ... ... "test foo"
#   gdb_test ... ... "test bar"
#
#   with_test_prefix "subvariation a" {
#     gdb_test ... ... "test x"
#   }
#
#   with_test_prefix "subvariation b" {
#     gdb_test ... ... "test x"
#   }
# }
#
# with_test_prefix "variation1" {
#   ...do setup for variation 1...
#   do_tests
# }
#
# with_test_prefix "variation2" {
#   ...do setup for variation 2...
#   do_tests
# }
#
# Results in:
#
#  PASS: gdb.base/mytest.exp: variation1: test foo
#  PASS: gdb.base/mytest.exp: variation1: test bar
#  PASS: gdb.base/mytest.exp: variation1: subvariation a: test x
#  PASS: gdb.base/mytest.exp: variation1: subvariation b: test x
#  PASS: gdb.base/mytest.exp: variation2: test foo
#  PASS: gdb.base/mytest.exp: variation2: test bar
#  PASS: gdb.base/mytest.exp: variation2: subvariation a: test x
#  PASS: gdb.base/mytest.exp: variation2: subvariation b: test x
#
# If for some reason more flexibility is necessary, one can also
# manipulate the pf_prefix global directly, treating it as a string.
# E.g.,
#
#   global pf_prefix
#   set saved_pf_prefix
#   append pf_prefix "${foo}: bar"
#   ... actual tests ...
#   set pf_prefix $saved_pf_prefix
#

# Run BODY in the context of the caller, with the current test prefix
# (pf_prefix) appended with one space, then PREFIX, and then a colon.
# Returns the result of BODY.
#
proc with_test_prefix { prefix body } {
  global pf_prefix

  set saved $pf_prefix
  append pf_prefix " " $prefix ":"
  set code [catch {uplevel 1 $body} result]
  set pf_prefix $saved

  if {$code == 1} {
      global errorInfo errorCode
      return -code $code -errorinfo $errorInfo -errorcode $errorCode $result
  } else {
      return -code $code $result
  }
}

# Run tests in BODY with GDB prompt and variable $gdb_prompt set to
# PROMPT.  When BODY is finished, restore GDB prompt and variable
# $gdb_prompt.
# Returns the result of BODY.
#
# Notes:
#
# 1) If you want to use, for example, "(foo)" as the prompt you must pass it
# as "(foo)", and not the regexp form "\(foo\)" (expressed as "\\(foo\\)" in
# TCL).  PROMPT is internally converted to a suitable regexp for matching.
# We do the conversion from "(foo)" to "\(foo\)" here for a few reasons:
#   a) It's more intuitive for callers to pass the plain text form.
#   b) We need two forms of the prompt:
#      - a regexp to use in output matching,
#      - a value to pass to the "set prompt" command.
#   c) It's easier to convert the plain text form to its regexp form.
#
# 2) Don't add a trailing space, we do that here.

proc with_gdb_prompt { prompt body } {
    global gdb_prompt

    # Convert "(foo)" to "\(foo\)".
    # We don't use string_to_regexp because while it works today it's not
    # clear it will work tomorrow: the value we need must work as both a
    # regexp *and* as the argument to the "set prompt" command, at least until
    # we start recording both forms separately instead of just $gdb_prompt.
    # The testsuite is pretty-much hardwired to interpret $gdb_prompt as the
    # regexp form.
    regsub -all {[]*+.|()^$\[\\]} $prompt {\\&} prompt

    set saved $gdb_prompt

    verbose -log "Setting gdb prompt to \"$prompt \"."
    set gdb_prompt $prompt
    gdb_test_no_output "set prompt $prompt " ""

    set code [catch {uplevel 1 $body} result]

    verbose -log "Restoring gdb prompt to \"$saved \"."
    set gdb_prompt $saved
    gdb_test_no_output "set prompt $saved " ""

    if {$code == 1} {
	global errorInfo errorCode
	return -code $code -errorinfo $errorInfo -errorcode $errorCode $result
    } else {
	return -code $code $result
    }
}

# Run tests in BODY with target-charset setting to TARGET_CHARSET.  When
# BODY is finished, restore target-charset.

proc with_target_charset { target_charset body } {
    global gdb_prompt

    set saved ""
    gdb_test_multiple "show target-charset" "" {
	-re "The target character set is \".*; currently (.*)\"\..*$gdb_prompt " {
	    set saved $expect_out(1,string)
	}
	-re "The target character set is \"(.*)\".*$gdb_prompt " {
	    set saved $expect_out(1,string)
	}
	-re ".*$gdb_prompt " {
	    fail "get target-charset"
	}
    }

    gdb_test_no_output "set target-charset $target_charset" ""

    set code [catch {uplevel 1 $body} result]

    gdb_test_no_output "set target-charset $saved" ""

    if {$code == 1} {
	global errorInfo errorCode
	return -code $code -errorinfo $errorInfo -errorcode $errorCode $result
    } else {
	return -code $code $result
    }
}

# Return 1 if _Complex types are supported, otherwise, return 0.

gdb_caching_proc support_complex_tests {
    # Set up, compile, and execute a test program containing _Complex types.
    # Include the current process ID in the file names to prevent conflicts
    # with invocations for multiple testsuites.
    set src [standard_temp_file complex[pid].c]
    set exe [standard_temp_file complex[pid].x]

    gdb_produce_source $src {
	int main() {
	    _Complex float cf;
	    _Complex double cd;
	    _Complex long double cld;
	    return 0;
	}
    }

    verbose "compiling testfile $src" 2
    set compile_flags {debug nowarnings quiet}
    set lines [gdb_compile $src $exe executable $compile_flags]
    file delete $src
    file delete $exe

    if ![string match "" $lines] then {
        verbose "testfile compilation failed, returning 0" 2
        set result 0
    } else {
	set result 1
    }

    return $result
}

# Return 1 if target hardware or OS supports single stepping to signal
# handler, otherwise, return 0.

proc can_single_step_to_signal_handler {} {

    # Targets don't have hardware single step.  On these targets, when
    # a signal is delivered during software single step, gdb is unable
    # to determine the next instruction addresses, because start of signal
    # handler is one of them.
    if { [istarget "arm*-*-*"] || [istarget "mips*-*-*"]
	 || [istarget "tic6x-*-*"] || [istarget "sparc*-*-linux*"]
	 || [istarget "nios2-*-*"] } {
	return 0
    }

    return 1
}

# Return 1 if target supports process record, otherwise return 0.

proc supports_process_record {} {

    if [target_info exists gdb,use_precord] {
	return [target_info gdb,use_precord]
    }

    if { [istarget "arm*-*-linux*"] || [istarget "x86_64-*-linux*"]
         || [istarget "i\[34567\]86-*-linux*"]
         || [istarget "powerpc*-*-linux*"] } {
	return 1
    }

    return 0
}

# Return 1 if target supports reverse debugging, otherwise return 0.

proc supports_reverse {} {

    if [target_info exists gdb,can_reverse] {
	return [target_info gdb,can_reverse]
    }

    if { [istarget "arm*-*-linux*"] || [istarget "x86_64-*-linux*"]
         || [istarget "i\[34567\]86-*-linux*"]
         || [istarget "powerpc*-*-linux*"] } {
	return 1
    }

    return 0
}

# Return 1 if readline library is used.

proc readline_is_used { } {
    global gdb_prompt

    gdb_test_multiple "show editing" "" {
	-re ".*Editing of command lines as they are typed is on\..*$gdb_prompt $" {
	    return 1
	}
	-re ".*$gdb_prompt $" {
	    return 0
	}
    }
}

# Return 1 if target is ELF.
gdb_caching_proc is_elf_target {
    set me "is_elf_target"

    set src [standard_temp_file is_elf_target[pid].c]
    set obj [standard_temp_file is_elf_target[pid].o]

    gdb_produce_source $src {
	int foo () {return 0;}
    }

    verbose "$me:  compiling testfile $src" 2
    set lines [gdb_compile $src $obj object {quiet}]

    file delete $src

    if ![string match "" $lines] then {
	verbose "$me:  testfile compilation failed, returning 0" 2
	return 0
    }

    set fp_obj [open $obj "r"]
    fconfigure $fp_obj -translation binary
    set data [read $fp_obj]
    close $fp_obj

    file delete $obj

    set ELFMAG "\u007FELF"

    if {[string compare -length 4 $data $ELFMAG] != 0} {
	verbose "$me:  returning 0" 2
	return 0
    }

    verbose "$me:  returning 1" 2
    return 1
}

# Return 1 if the memory at address zero is readable.

gdb_caching_proc is_address_zero_readable {
    global gdb_prompt

    set ret 0
    gdb_test_multiple "x 0" "" {
	-re "Cannot access memory at address 0x0.*$gdb_prompt $" {
	    set ret 0
	}
	-re ".*$gdb_prompt $" {
	    set ret 1
	}
    }

    return $ret
}

# Produce source file NAME and write SOURCES into it.

proc gdb_produce_source { name sources } {
    set index 0
    set f [open $name "w"]

    puts $f $sources
    close $f
}

# Return 1 if target is ILP32.
# This cannot be decided simply from looking at the target string,
# as it might depend on externally passed compiler options like -m64.
gdb_caching_proc is_ilp32_target {
    set me "is_ilp32_target"

    set src [standard_temp_file ilp32[pid].c]
    set obj [standard_temp_file ilp32[pid].o]

    gdb_produce_source $src {
	int dummy[sizeof (int) == 4
		  && sizeof (void *) == 4
		  && sizeof (long) == 4 ? 1 : -1];
    }

    verbose "$me:  compiling testfile $src" 2
    set lines [gdb_compile $src $obj object {quiet}]
    file delete $src
    file delete $obj

    if ![string match "" $lines] then {
        verbose "$me:  testfile compilation failed, returning 0" 2
        return 0
    }

    verbose "$me:  returning 1" 2
    return 1
}

# Return 1 if target is LP64.
# This cannot be decided simply from looking at the target string,
# as it might depend on externally passed compiler options like -m64.
gdb_caching_proc is_lp64_target {
    set me "is_lp64_target"

    set src [standard_temp_file lp64[pid].c]
    set obj [standard_temp_file lp64[pid].o]

    gdb_produce_source $src {
	int dummy[sizeof (int) == 4
		  && sizeof (void *) == 8
		  && sizeof (long) == 8 ? 1 : -1];
    }

    verbose "$me:  compiling testfile $src" 2
    set lines [gdb_compile $src $obj object {quiet}]
    file delete $src
    file delete $obj

    if ![string match "" $lines] then {
        verbose "$me:  testfile compilation failed, returning 0" 2
        return 0
    }

    verbose "$me:  returning 1" 2
    return 1
}

# Return 1 if target has 64 bit addresses.
# This cannot be decided simply from looking at the target string,
# as it might depend on externally passed compiler options like -m64.
gdb_caching_proc is_64_target {
    set me "is_64_target"

    set src [standard_temp_file is64[pid].c]
    set obj [standard_temp_file is64[pid].o]

    gdb_produce_source $src {
	int function(void) { return 3; }
	int dummy[sizeof (&function) == 8 ? 1 : -1];
    }

    verbose "$me:  compiling testfile $src" 2
    set lines [gdb_compile $src $obj object {quiet}]
    file delete $src
    file delete $obj

    if ![string match "" $lines] then {
        verbose "$me:  testfile compilation failed, returning 0" 2
        return 0
    }

    verbose "$me:  returning 1" 2
    return 1
}

# Return 1 if target has x86_64 registers - either amd64 or x32.
# x32 target identifies as x86_64-*-linux*, therefore it cannot be determined
# just from the target string.
gdb_caching_proc is_amd64_regs_target {
    if {![istarget "x86_64-*-*"] && ![istarget "i?86-*"]} {
	return 0
    }

    set me "is_amd64_regs_target"

    set src [standard_temp_file reg64[pid].s]
    set obj [standard_temp_file reg64[pid].o]

    set list {}
    foreach reg \
	{rax rbx rcx rdx rsi rdi rbp rsp r8 r9 r10 r11 r12 r13 r14 r15} {
	    lappend list "\tincq %$reg"
	}
    gdb_produce_source $src [join $list \n]

    verbose "$me:  compiling testfile $src" 2
    set lines [gdb_compile $src $obj object {quiet}]
    file delete $src
    file delete $obj

    if ![string match "" $lines] then {
        verbose "$me:  testfile compilation failed, returning 0" 2
        return 0
    }

    verbose "$me:  returning 1" 2
    return 1
}

# Return 1 if this target is an x86 or x86-64 with -m32.
proc is_x86_like_target {} {
    if {![istarget "x86_64-*-*"] && ![istarget i?86-*]} {
	return 0
    }
    return [expr [is_ilp32_target] && ![is_amd64_regs_target]]
}

# Return 1 if displaced stepping is supported on target, otherwise, return 0.
proc support_displaced_stepping {} {

    if { [istarget "x86_64-*-linux*"] || [istarget "i\[34567\]86-*-linux*"]
	 || [istarget "arm*-*-linux*"] || [istarget "powerpc-*-linux*"]
	 || [istarget "powerpc64-*-linux*"] || [istarget "s390*-*-*"] } {
	return 1
    }

    return 0
}

# Run a test on the target to see if it supports vmx hardware.  Return 0 if so, 
# 1 if it does not.  Based on 'check_vmx_hw_available' from the GCC testsuite.

gdb_caching_proc skip_altivec_tests {
    global srcdir subdir gdb_prompt inferior_exited_re

    set me "skip_altivec_tests"

    # Some simulators are known to not support VMX instructions.
    if { [istarget powerpc-*-eabi] || [istarget powerpc*-*-eabispe] } {
        verbose "$me:  target known to not support VMX, returning 1" 2
        return 1
    }

    # Make sure we have a compiler that understands altivec.
    set compile_flags {debug nowarnings}
    if [get_compiler_info] {
       warning "Could not get compiler info"
       return 1
    }
    if [test_compiler_info gcc*] {
        set compile_flags "$compile_flags additional_flags=-maltivec"
    } elseif [test_compiler_info xlc*] {
        set compile_flags "$compile_flags additional_flags=-qaltivec"
    } else {
        verbose "Could not compile with altivec support, returning 1" 2
        return 1
    }

    # Set up, compile, and execute a test program containing VMX instructions.
    # Include the current process ID in the file names to prevent conflicts
    # with invocations for multiple testsuites.
    set src [standard_temp_file vmx[pid].c]
    set exe [standard_temp_file vmx[pid].x]

    gdb_produce_source $src {
	int main() {
	    #ifdef __MACH__
	    asm volatile ("vor v0,v0,v0");
	    #else
	    asm volatile ("vor 0,0,0");
	    #endif
	    return 0;
	}
    }

    verbose "$me:  compiling testfile $src" 2
    set lines [gdb_compile $src $exe executable $compile_flags]
    file delete $src

    if ![string match "" $lines] then {
        verbose "$me:  testfile compilation failed, returning 1" 2
        return 1
    }

    # No error message, compilation succeeded so now run it via gdb.

    gdb_exit
    gdb_start
    gdb_reinitialize_dir $srcdir/$subdir
    gdb_load "$exe"
    gdb_run_cmd
    gdb_expect {
        -re ".*Illegal instruction.*${gdb_prompt} $" {
            verbose -log "\n$me altivec hardware not detected" 
            set skip_vmx_tests 1
        }
        -re ".*$inferior_exited_re normally.*${gdb_prompt} $" {
            verbose -log "\n$me: altivec hardware detected" 
            set skip_vmx_tests 0
        }
        default {
          warning "\n$me: default case taken"
            set skip_vmx_tests 1
        }
    }
    gdb_exit
    remote_file build delete $exe

    verbose "$me:  returning $skip_vmx_tests" 2
    return $skip_vmx_tests
}

# Run a test on the target to see if it supports vmx hardware.  Return 0 if so,
# 1 if it does not.  Based on 'check_vmx_hw_available' from the GCC testsuite.

gdb_caching_proc skip_vsx_tests {
    global srcdir subdir gdb_prompt inferior_exited_re

    set me "skip_vsx_tests"

    # Some simulators are known to not support Altivec instructions, so
    # they won't support VSX instructions as well.
    if { [istarget powerpc-*-eabi] || [istarget powerpc*-*-eabispe] } {
        verbose "$me:  target known to not support VSX, returning 1" 2
        return 1
    }

    # Make sure we have a compiler that understands altivec.
    set compile_flags {debug nowarnings quiet}
    if [get_compiler_info] {
       warning "Could not get compiler info"
       return 1
    }
    if [test_compiler_info gcc*] {
        set compile_flags "$compile_flags additional_flags=-mvsx"
    } elseif [test_compiler_info xlc*] {
        set compile_flags "$compile_flags additional_flags=-qasm=gcc"
    } else {
        verbose "Could not compile with vsx support, returning 1" 2
        return 1
    }

    set src [standard_temp_file vsx[pid].c]
    set exe [standard_temp_file vsx[pid].x]

    gdb_produce_source $src {
	int main() {
	    double a[2] = { 1.0, 2.0 };
	    #ifdef __MACH__
	    asm volatile ("lxvd2x v0,v0,%[addr]" : : [addr] "r" (a));
	    #else
	    asm volatile ("lxvd2x 0,0,%[addr]" : : [addr] "r" (a));
	    #endif
	    return 0;
	}
    }

    verbose "$me:  compiling testfile $src" 2
    set lines [gdb_compile $src $exe executable $compile_flags]
    file delete $src

    if ![string match "" $lines] then {
        verbose "$me:  testfile compilation failed, returning 1" 2
        return 1
    }

    # No error message, compilation succeeded so now run it via gdb.

    gdb_exit
    gdb_start
    gdb_reinitialize_dir $srcdir/$subdir
    gdb_load "$exe"
    gdb_run_cmd
    gdb_expect {
        -re ".*Illegal instruction.*${gdb_prompt} $" {
            verbose -log "\n$me VSX hardware not detected"
            set skip_vsx_tests 1
        }
        -re ".*$inferior_exited_re normally.*${gdb_prompt} $" {
            verbose -log "\n$me: VSX hardware detected"
            set skip_vsx_tests 0
        }
        default {
          warning "\n$me: default case taken"
            set skip_vsx_tests 1
        }
    }
    gdb_exit
    remote_file build delete $exe

    verbose "$me:  returning $skip_vsx_tests" 2
    return $skip_vsx_tests
}

# Run a test on the target to see if it supports btrace hardware.  Return 0 if so,
# 1 if it does not.  Based on 'check_vmx_hw_available' from the GCC testsuite.

gdb_caching_proc skip_btrace_tests {
    global srcdir subdir gdb_prompt inferior_exited_re

    set me "skip_btrace_tests"
    if { ![istarget "i?86-*-*"] && ![istarget "x86_64-*-*"] } {
        verbose "$me:  target does not support btrace, returning 1" 2
        return 1
    }

    # Set up, compile, and execute a test program.
    # Include the current process ID in the file names to prevent conflicts
    # with invocations for multiple testsuites.
    set src [standard_temp_file btrace[pid].c]
    set exe [standard_temp_file btrace[pid].x]

    gdb_produce_source $src {
	int main(void) { return 0; }
    }

    verbose "$me:  compiling testfile $src" 2
    set compile_flags {debug nowarnings quiet}
    set lines [gdb_compile $src $exe executable $compile_flags]

    if ![string match "" $lines] then {
        verbose "$me:  testfile compilation failed, returning 1" 2
	file delete $src
        return 1
    }

    # No error message, compilation succeeded so now run it via gdb.

    gdb_exit
    gdb_start
    gdb_reinitialize_dir $srcdir/$subdir
    gdb_load $exe
    if ![runto_main] {
	file delete $src
        return 1
    }
    file delete $src
    # In case of an unexpected output, we return 2 as a fail value.
    set skip_btrace_tests 2
    gdb_test_multiple "record btrace" "check btrace support" {
        -re "You can't do that when your target is.*\r\n$gdb_prompt $" {
            set skip_btrace_tests 1
        }
        -re "Target does not support branch tracing.*\r\n$gdb_prompt $" {
            set skip_btrace_tests 1
        }
        -re "Could not enable branch tracing.*\r\n$gdb_prompt $" {
            set skip_btrace_tests 1
        }
        -re "^record btrace\r\n$gdb_prompt $" {
            set skip_btrace_tests 0
        }
    }
    gdb_exit
    remote_file build delete $exe

    verbose "$me:  returning $skip_btrace_tests" 2
    return $skip_btrace_tests
}

# Skip all the tests in the file if you are not on an hppa running
# hpux target.

proc skip_hp_tests {} {
    eval set skip_hp [ expr ![isnative] || ![istarget "hppa*-*-hpux*"] ]
    verbose "Skip hp tests is $skip_hp"
    return $skip_hp
}

# Return whether we should skip tests for showing inlined functions in
# backtraces.  Requires get_compiler_info and get_debug_format.

proc skip_inline_frame_tests {} {
    # GDB only recognizes inlining information in DWARF 2 (DWARF 3).
    if { ! [test_debug_format "DWARF 2"] } {
	return 1
    }

    # GCC before 4.1 does not emit DW_AT_call_file / DW_AT_call_line.
    if { ([test_compiler_info "gcc-2-*"]
	  || [test_compiler_info "gcc-3-*"]
	  || [test_compiler_info "gcc-4-0-*"]) } {
	return 1
    }

    return 0
}

# Return whether we should skip tests for showing variables from
# inlined functions.  Requires get_compiler_info and get_debug_format.

proc skip_inline_var_tests {} {
    # GDB only recognizes inlining information in DWARF 2 (DWARF 3).
    if { ! [test_debug_format "DWARF 2"] } {
	return 1
    }

    return 0
}

# Return a 1 if we should skip tests that require hardware breakpoints

proc skip_hw_breakpoint_tests {} {
    # Skip tests if requested by the board (note that no_hardware_watchpoints
    # disables both watchpoints and breakpoints)
    if { [target_info exists gdb,no_hardware_watchpoints]} {
	return 1
    }

    # These targets support hardware breakpoints natively
    if { [istarget "i?86-*-*"] 
	 || [istarget "x86_64-*-*"]
	 || [istarget "ia64-*-*"] 
	 || [istarget "arm*-*-*"]} {
	return 0
    }

    return 1
}

# Return a 1 if we should skip tests that require hardware watchpoints

proc skip_hw_watchpoint_tests {} {
    # Skip tests if requested by the board
    if { [target_info exists gdb,no_hardware_watchpoints]} {
	return 1
    }

    # These targets support hardware watchpoints natively
    if { [istarget "i?86-*-*"] 
	 || [istarget "x86_64-*-*"]
	 || [istarget "ia64-*-*"] 
	 || [istarget "arm*-*-*"]
	 || [istarget "powerpc*-*-linux*"]
	 || [istarget "s390*-*-*"] } {
	return 0
    }

    return 1
}

# Return a 1 if we should skip tests that require *multiple* hardware
# watchpoints to be active at the same time

proc skip_hw_watchpoint_multi_tests {} {
    if { [skip_hw_watchpoint_tests] } {
	return 1
    }

    # These targets support just a single hardware watchpoint
    if { [istarget "arm*-*-*"]
	 || [istarget "powerpc*-*-linux*"] } {
	return 1
    }

    return 0
}

# Return a 1 if we should skip tests that require read/access watchpoints

proc skip_hw_watchpoint_access_tests {} {
    if { [skip_hw_watchpoint_tests] } {
	return 1
    }

    # These targets support just write watchpoints
    if { [istarget "s390*-*-*"] } {
	return 1
    }

    return 0
}

# Return 1 if we should skip tests that require the runtime unwinder
# hook.  This must be invoked while gdb is running, after shared
# libraries have been loaded.  This is needed because otherwise a
# shared libgcc won't be visible.

proc skip_unwinder_tests {} {
    global gdb_prompt

    set ok 0
    gdb_test_multiple "print _Unwind_DebugHook" "check for unwinder hook" {
	-re "= .*no debug info.*_Unwind_DebugHook.*\r\n$gdb_prompt $" {
	}
	-re "= .*_Unwind_DebugHook.*\r\n$gdb_prompt $" {
	    set ok 1
	}
	-re "No symbol .* in current context.\r\n$gdb_prompt $" {
	}
    }
    if {!$ok} {
	gdb_test_multiple "info probe" "check for stap probe in unwinder" {
	    -re ".*libgcc.*unwind.*\r\n$gdb_prompt $" {
		set ok 1
	    }
	    -re "\r\n$gdb_prompt $" {
	    }
	}
    }
    return $ok
}

# Return 0 if we should skip tests that require the libstdc++ stap
# probes.  This must be invoked while gdb is running, after shared
# libraries have been loaded.

proc skip_libstdcxx_probe_tests {} {
    global gdb_prompt

    set ok 0
    gdb_test_multiple "info probe" "check for stap probe in libstdc++" {
	-re ".*libstdcxx.*catch.*\r\n$gdb_prompt $" {
	    set ok 1
	}
	-re "\r\n$gdb_prompt $" {
	}
    }
    return $ok
}

# Return 1 if we should skip tests of the "compile" feature.
# This must be invoked after the inferior has been started.

proc skip_compile_feature_tests {} {
    global gdb_prompt

    set result 0
    gdb_test_multiple "compile code -- ;" "check for working compile command" {
	"Could not load libcc1.*\r\n$gdb_prompt $" {
	    set result 1
	}
	-re "Command not supported on this host\\..*\r\n$gdb_prompt $" {
	    set result 1
	}
	-re "\r\n$gdb_prompt $" {
	}
    }
    return $result
}

# Check whether we're testing with the remote or extended-remote
# targets.

proc gdb_is_target_remote {} {
    global gdb_prompt

    set test "probe for target remote"
    gdb_test_multiple "maint print target-stack" $test {
	-re ".*emote serial target in gdb-specific protocol.*$gdb_prompt $" {
	    pass $test
	    return 1
	}
	-re "$gdb_prompt $" {
	    pass $test
	}
    }
    return 0
}

# Return 1 if the current remote target is an instance of our GDBserver, 0
# otherwise.  Return -1 if there was an error and we can't tell.

gdb_caching_proc target_is_gdbserver {
    global gdb_prompt

    set is_gdbserver -1
    set test "Probing for GDBserver"

    gdb_test_multiple "monitor help" $test {
	-re "The following monitor commands are supported.*Quit GDBserver.*$gdb_prompt $" {
	    set is_gdbserver 1
	}
	-re "$gdb_prompt $" {
	    set is_gdbserver 0
	}
    }

    if { $is_gdbserver == -1 } {
	verbose -log "Unable to tell whether we are using GDBserver or not."
    }

    return $is_gdbserver
}

set compiler_info		"unknown"
set gcc_compiled		0
set hp_cc_compiler		0
set hp_aCC_compiler		0

# Figure out what compiler I am using.
#
# ARG can be empty or "C++".  If empty, "C" is assumed.
#
# There are several ways to do this, with various problems.
#
# [ gdb_compile -E $ifile -o $binfile.ci ]
# source $binfile.ci
#
#   Single Unix Spec v3 says that "-E -o ..." together are not
#   specified.  And in fact, the native compiler on hp-ux 11 (among
#   others) does not work with "-E -o ...".  Most targets used to do
#   this, and it mostly worked, because it works with gcc.
#
# [ catch "exec $compiler -E $ifile > $binfile.ci" exec_output ]
# source $binfile.ci
# 
#   This avoids the problem with -E and -o together.  This almost works
#   if the build machine is the same as the host machine, which is
#   usually true of the targets which are not gcc.  But this code does
#   not figure which compiler to call, and it always ends up using the C
#   compiler.  Not good for setting hp_aCC_compiler.  Target
#   hppa*-*-hpux* used to do this.
#
# [ gdb_compile -E $ifile > $binfile.ci ]
# source $binfile.ci
#
#   dejagnu target_compile says that it supports output redirection,
#   but the code is completely different from the normal path and I
#   don't want to sweep the mines from that path.  So I didn't even try
#   this.
#
# set cppout [ gdb_compile $ifile "" preprocess $args quiet ]
# eval $cppout
#
#   I actually do this for all targets now.  gdb_compile runs the right
#   compiler, and TCL captures the output, and I eval the output.
#
#   Unfortunately, expect logs the output of the command as it goes by,
#   and dejagnu helpfully prints a second copy of it right afterwards.
#   So I turn off expect logging for a moment.
#   
# [ gdb_compile $ifile $ciexe_file executable $args ]
# [ remote_exec $ciexe_file ]
# [ source $ci_file.out ]
#
#   I could give up on -E and just do this.
#   I didn't get desperate enough to try this.
#
# -- chastain 2004-01-06

proc get_compiler_info {{arg ""}} {
    # For compiler.c and compiler.cc
    global srcdir

    # I am going to play with the log to keep noise out.
    global outdir
    global tool

    # These come from compiler.c or compiler.cc
    global compiler_info

    # Legacy global data symbols.
    global gcc_compiled
    global hp_cc_compiler
    global hp_aCC_compiler

    # Choose which file to preprocess.
    set ifile "${srcdir}/lib/compiler.c"
    if { $arg == "c++" } {
	set ifile "${srcdir}/lib/compiler.cc"
    }

    # Run $ifile through the right preprocessor.
    # Toggle gdb.log to keep the compiler output out of the log.
    set saved_log [log_file -info]
    log_file
    if [is_remote host] {
	# We have to use -E and -o together, despite the comments
	# above, because of how DejaGnu handles remote host testing.
	set ppout "$outdir/compiler.i"
	gdb_compile "${ifile}" "$ppout" preprocess [list "$arg" quiet]
	set file [open $ppout r]
	set cppout [read $file]
	close $file
    } else {
	set cppout [ gdb_compile "${ifile}" "" preprocess [list "$arg" quiet] ]
    }
    eval log_file $saved_log

    # Eval the output.
    set unknown 0
    foreach cppline [ split "$cppout" "\n" ] {
	if { [ regexp "^#" "$cppline" ] } {
	    # line marker
	} elseif { [ regexp "^\[\n\r\t \]*$" "$cppline" ] } {
	    # blank line
	} elseif { [ regexp "^\[\n\r\t \]*set\[\n\r\t \]" "$cppline" ] } {
	    # eval this line
	    verbose "get_compiler_info: $cppline" 2
	    eval "$cppline"
	} else {
	    # unknown line
	    verbose -log "get_compiler_info: $cppline"
	    set unknown 1
	}
    }

    # Reset to unknown compiler if any diagnostics happened.
    if { $unknown } {
	set compiler_info "unknown"
    }

    # Set the legacy symbols.
    set gcc_compiled     0
    set hp_cc_compiler   0
    set hp_aCC_compiler  0
    if { [regexp "^gcc-1-" "$compiler_info" ] } { set gcc_compiled 1 }
    if { [regexp "^gcc-2-" "$compiler_info" ] } { set gcc_compiled 2 }
    if { [regexp "^gcc-3-" "$compiler_info" ] } { set gcc_compiled 3 }
    if { [regexp "^gcc-4-" "$compiler_info" ] } { set gcc_compiled 4 }
    if { [regexp "^gcc-5-" "$compiler_info" ] } { set gcc_compiled 5 }
    if { [regexp "^hpcc-"  "$compiler_info" ] } { set hp_cc_compiler 1 }
    if { [regexp "^hpacc-" "$compiler_info" ] } { set hp_aCC_compiler 1 }

    # Log what happened.
    verbose -log "get_compiler_info: $compiler_info"

    # Most compilers will evaluate comparisons and other boolean
    # operations to 0 or 1.
    uplevel \#0 { set true 1 }
    uplevel \#0 { set false 0 }

    # Use of aCC results in boolean results being displayed as
    # "true" or "false"
    if { $hp_aCC_compiler } {
      uplevel \#0 { set true true }
      uplevel \#0 { set false false }
    }

    return 0
}

proc test_compiler_info { {compiler ""} } {
    global compiler_info

     # if no arg, return the compiler_info string

     if [string match "" $compiler] {
         if [info exists compiler_info] {
             return $compiler_info
         } else {
             perror "No compiler info found."
         }
     }

    return [string match $compiler $compiler_info]
}

proc current_target_name { } {
    global target_info
    if [info exists target_info(target,name)] {
        set answer $target_info(target,name)
    } else {
        set answer ""
    }
    return $answer
}

set gdb_wrapper_initialized 0
set gdb_wrapper_target ""

proc gdb_wrapper_init { args } {
    global gdb_wrapper_initialized
    global gdb_wrapper_file
    global gdb_wrapper_flags
    global gdb_wrapper_target

    if { $gdb_wrapper_initialized == 1 } { return; }

    if {[target_info exists needs_status_wrapper] && \
	    [target_info needs_status_wrapper] != "0"} {
	set result [build_wrapper "testglue.o"]
	if { $result != "" } {
	    set gdb_wrapper_file [lindex $result 0]
	    set gdb_wrapper_flags [lindex $result 1]
	} else {
	    warning "Status wrapper failed to build."
	}
    }
    set gdb_wrapper_initialized 1
    set gdb_wrapper_target [current_target_name]
}

# Some targets need to always link a special object in.  Save its path here.
global gdb_saved_set_unbuffered_mode_obj
set gdb_saved_set_unbuffered_mode_obj ""

proc gdb_compile {source dest type options} {
    global GDB_TESTCASE_OPTIONS
    global gdb_wrapper_file
    global gdb_wrapper_flags
    global gdb_wrapper_initialized
    global srcdir
    global objdir
    global gdb_saved_set_unbuffered_mode_obj

    set outdir [file dirname $dest]

    # Add platform-specific options if a shared library was specified using
    # "shlib=librarypath" in OPTIONS.
    set new_options ""
    set shlib_found 0
    set shlib_load 0
    foreach opt $options {
        if [regexp {^shlib=(.*)} $opt dummy_var shlib_name] {
            if [test_compiler_info "xlc-*"] {
		# IBM xlc compiler doesn't accept shared library named other
		# than .so: use "-Wl," to bypass this
		lappend source "-Wl,$shlib_name"
	    } elseif { ([istarget "*-*-mingw*"]
			|| [istarget *-*-cygwin*]
			|| [istarget *-*-pe*])} {
		lappend source "${shlib_name}.a"
            } else {
               lappend source $shlib_name
            }
            if { $shlib_found == 0 } {
                set shlib_found 1
		if { ([istarget "*-*-mingw*"]
		      || [istarget *-*-cygwin*]) } {
		    lappend new_options "additional_flags=-Wl,--enable-auto-import"
		}
            }
	} elseif { $opt == "shlib_load" } {
	    set shlib_load 1
        } else {
            lappend new_options $opt
        }
    }

    # We typically link to shared libraries using an absolute path, and
    # that's how they are found at runtime.  If we are going to
    # dynamically load one by basename, we must specify rpath.  If we
    # are using a remote host, DejaGNU will link to the shared library
    # using a relative path, so again we must specify an rpath.
    if { $shlib_load || ($shlib_found && [is_remote target]) } {
	if { ([istarget "*-*-mingw*"]
	      || [istarget *-*-cygwin*]
	      || [istarget *-*-pe*]
	      || [istarget hppa*-*-hpux*])} {
	    # Do not need anything.
	} elseif { [istarget *-*-freebsd*] || [istarget *-*-openbsd*] } {
	    lappend new_options "ldflags=-Wl,-rpath,${outdir}"
	} elseif { [istarget arm*-*-symbianelf*] } {
	    if { $shlib_load } {
		lappend new_options "libs=-ldl"
	    }
	} else {
	    if { $shlib_load } {
		lappend new_options "libs=-ldl"
	    }
	    lappend new_options "ldflags=-Wl,-rpath,\\\$ORIGIN"
	}
    }
    set options $new_options

    if [info exists GDB_TESTCASE_OPTIONS] {
	lappend options "additional_flags=$GDB_TESTCASE_OPTIONS"
    }
    verbose "options are $options"
    verbose "source is $source $dest $type $options"

    if { $gdb_wrapper_initialized == 0 } { gdb_wrapper_init }

    if {[target_info exists needs_status_wrapper] && \
	    [target_info needs_status_wrapper] != "0" && \
	    [info exists gdb_wrapper_file]} {
	lappend options "libs=${gdb_wrapper_file}"
	lappend options "ldflags=${gdb_wrapper_flags}"
    }

    # Replace the "nowarnings" option with the appropriate additional_flags
    # to disable compiler warnings.
    set nowarnings [lsearch -exact $options nowarnings]
    if {$nowarnings != -1} {
	if [target_info exists gdb,nowarnings_flag] {
	    set flag "additional_flags=[target_info gdb,nowarnings_flag]"
	} else {
	    set flag "additional_flags=-w"
	}
	set options [lreplace $options $nowarnings $nowarnings $flag]
    }

    if { $type == "executable" } {
	if { ([istarget "*-*-mingw*"]
	      || [istarget "*-*-*djgpp"]
	      || [istarget "*-*-cygwin*"])} {
	    # Force output to unbuffered mode, by linking in an object file
	    # with a global contructor that calls setvbuf.
	    #
	    # Compile the special object seperatelly for two reasons:
	    #  1) Insulate it from $options.
	    #  2) Avoid compiling it for every gdb_compile invocation,
	    #  which is time consuming, especially if we're remote
	    #  host testing.
	    #
	    if { $gdb_saved_set_unbuffered_mode_obj == "" } {
		verbose "compiling gdb_saved_set_unbuffered_obj"
		set unbuf_src ${srcdir}/lib/set_unbuffered_mode.c
		set unbuf_obj ${objdir}/set_unbuffered_mode.o

		set result [gdb_compile "${unbuf_src}" "${unbuf_obj}" object {nowarnings}]
		if { $result != "" } {
		    return $result
		}
		if {[is_remote host]} {
		    set gdb_saved_set_unbuffered_mode_obj set_unbuffered_mode_saved.o
		} else {
		    set gdb_saved_set_unbuffered_mode_obj ${objdir}/set_unbuffered_mode_saved.o
		}
		# Link a copy of the output object, because the
		# original may be automatically deleted.
		remote_download host $unbuf_obj $gdb_saved_set_unbuffered_mode_obj
	    } else {
		verbose "gdb_saved_set_unbuffered_obj already compiled"
	    }

	    # Rely on the internal knowledge that the global ctors are ran in
	    # reverse link order.  In that case, we can use ldflags to
	    # avoid copying the object file to the host multiple
	    # times.
	    # This object can only be added if standard libraries are
	    # used. Thus, we need to disable it if -nostdlib option is used
	    if {[lsearch -regexp $options "-nostdlib"] < 0 } {
		lappend options "ldflags=$gdb_saved_set_unbuffered_mode_obj"
	    }
	}
    }

    set result [target_compile $source $dest $type $options]

    # Prune uninteresting compiler (and linker) output.
    regsub "Creating library file: \[^\r\n\]*\[\r\n\]+" $result "" result

    regsub "\[\r\n\]*$" "$result" "" result
    regsub "^\[\r\n\]*" "$result" "" result
    
    if {[lsearch $options quiet] < 0} {
	# We shall update this on a per language basis, to avoid
	# changing the entire testsuite in one go.
	if {[lsearch $options f77] >= 0} {
	    gdb_compile_test $source $result
	} elseif { $result != "" } {
	    clone_output "gdb compile failed, $result"
	}
    }
    return $result
}


# This is just like gdb_compile, above, except that it tries compiling
# against several different thread libraries, to see which one this
# system has.
proc gdb_compile_pthreads {source dest type options} {
    set built_binfile 0
    set why_msg "unrecognized error"
    foreach lib {-lpthreads -lpthread -lthread ""} {
        # This kind of wipes out whatever libs the caller may have
        # set.  Or maybe theirs will override ours.  How infelicitous.
        set options_with_lib [concat $options [list libs=$lib quiet]]
        set ccout [gdb_compile $source $dest $type $options_with_lib]
        switch -regexp -- $ccout {
            ".*no posix threads support.*" {
                set why_msg "missing threads include file"
                break
            }
            ".*cannot open -lpthread.*" {
                set why_msg "missing runtime threads library"
            }
            ".*Can't find library for -lpthread.*" {
                set why_msg "missing runtime threads library"
            }
            {^$} {
                pass "successfully compiled posix threads test case"
                set built_binfile 1
                break
            }
        }
    }
    if {!$built_binfile} {
	unsupported "Couldn't compile [file tail $source]: ${why_msg}"
        return -1
    }
}

# Build a shared library from SOURCES.

proc gdb_compile_shlib {sources dest options} {
    set obj_options $options

    set info_options ""
    if { [lsearch -exact $options "c++"] >= 0 } {
	set info_options "c++"
    }
    if [get_compiler_info ${info_options}] {
       return -1
    }

    switch -glob [test_compiler_info] {
        "xlc-*" {
            lappend obj_options "additional_flags=-qpic"
        }
	"clang-*" {
	    if { !([istarget "*-*-cygwin*"]
		   || [istarget "*-*-mingw*"]) } {
		lappend obj_options "additional_flags=-fpic"
	    }
	}
        "gcc-*" {
            if { !([istarget "powerpc*-*-aix*"]
                   || [istarget "rs6000*-*-aix*"]
                   || [istarget "*-*-cygwin*"]
                   || [istarget "*-*-mingw*"]
                   || [istarget "*-*-pe*"]) } {
                lappend obj_options "additional_flags=-fpic"
            }
        }
        default {
            switch -glob [istarget] {
                "hppa*-hp-hpux*" {
                    lappend obj_options "additional_flags=+z"
                }
                default {
                    # don't know what the compiler is...
                }
            }
        }
    }

    set outdir [file dirname $dest]
    set objects ""
    foreach source $sources {
       set sourcebase [file tail $source]
       if {[gdb_compile $source "${outdir}/${sourcebase}.o" object $obj_options] != ""} {
           return -1
       }
       lappend objects ${outdir}/${sourcebase}.o
    }

    if [istarget "hppa*-*-hpux*"] {
       remote_exec build "ld -b ${objects} -o ${dest}"
    } else {
       set link_options $options
       if [test_compiler_info "xlc-*"] {
          lappend link_options "additional_flags=-qmkshrobj"
       } else {
          lappend link_options "additional_flags=-shared"

	   if { ([istarget "*-*-mingw*"]
		 || [istarget *-*-cygwin*]
		 || [istarget *-*-pe*]) } {
	       if { [is_remote host] } {
		   set name [file tail ${dest}]
	       } else {
		   set name ${dest}
	       }
	       lappend link_options "additional_flags=-Wl,--out-implib,${name}.a"
	   } elseif [is_remote target] {
	     # By default, we do not set the soname.  This causes the linker
	     # on ELF systems to create a DT_NEEDED entry in the executable
	     # refering to the full path name of the library.  This is a
	     # problem in remote testing if the library is in a different
	     # directory there.  To fix this, we set a soname of just the
	     # base filename for the library, and add an appropriate -rpath
	     # to the main executable (in gdb_compile).
             set destbase [file tail $dest]
             lappend link_options "additional_flags=-Wl,-soname,$destbase"
           }
       }
       if {[gdb_compile "${objects}" "${dest}" executable $link_options] != ""} {
           return -1
       }
	if { [is_remote host]
	     && ([istarget "*-*-mingw*"]
		 || [istarget *-*-cygwin*]
		 || [istarget *-*-pe*]) } {
	    set dest_tail_name [file tail ${dest}]
	    remote_upload host $dest_tail_name.a ${dest}.a
	    remote_file host delete $dest_tail_name.a
	}
    }
  return ""
}

# This is just like gdb_compile_shlib, above, except that it tries compiling
# against several different thread libraries, to see which one this
# system has.
proc gdb_compile_shlib_pthreads {sources dest options} {
    set built_binfile 0
    set why_msg "unrecognized error"
    foreach lib {-lpthreads -lpthread -lthread ""} {
        # This kind of wipes out whatever libs the caller may have
        # set.  Or maybe theirs will override ours.  How infelicitous.
        set options_with_lib [concat $options [list libs=$lib quiet]]
        set ccout [gdb_compile_shlib $sources $dest $options_with_lib]
        switch -regexp -- $ccout {
            ".*no posix threads support.*" {
                set why_msg "missing threads include file"
                break
            }
            ".*cannot open -lpthread.*" {
                set why_msg "missing runtime threads library"
            }
            ".*Can't find library for -lpthread.*" {
                set why_msg "missing runtime threads library"
            }
            {^$} {
                pass "successfully compiled posix threads test case"
                set built_binfile 1
                break
            }
        }
    }
    if {!$built_binfile} {
        unsupported "Couldn't compile $sources: ${why_msg}"
        return -1
    }
}

# This is just like gdb_compile_pthreads, above, except that we always add the
# objc library for compiling Objective-C programs
proc gdb_compile_objc {source dest type options} {
    set built_binfile 0
    set why_msg "unrecognized error"
    foreach lib {-lobjc -lpthreads -lpthread -lthread solaris} {
        # This kind of wipes out whatever libs the caller may have
        # set.  Or maybe theirs will override ours.  How infelicitous.
        if { $lib == "solaris" } {
            set lib "-lpthread -lposix4"
	}
        if { $lib != "-lobjc" } {
	  set lib "-lobjc $lib"
	}
        set options_with_lib [concat $options [list libs=$lib quiet]]
        set ccout [gdb_compile $source $dest $type $options_with_lib]
        switch -regexp -- $ccout {
            ".*no posix threads support.*" {
                set why_msg "missing threads include file"
                break
            }
            ".*cannot open -lpthread.*" {
                set why_msg "missing runtime threads library"
            }
            ".*Can't find library for -lpthread.*" {
                set why_msg "missing runtime threads library"
            }
            {^$} {
                pass "successfully compiled objc with posix threads test case"
                set built_binfile 1
                break
            }
        }
    }
    if {!$built_binfile} {
        unsupported "Couldn't compile [file tail $source]: ${why_msg}"
        return -1
    }
}

proc send_gdb { string } {
    global suppress_flag
    if { $suppress_flag } {
	return "suppressed"
    }
    return [remote_send host "$string"]
}

#
#

proc gdb_expect { args } {
    if { [llength $args] == 2  && [lindex $args 0] != "-re" } {
	set atimeout [lindex $args 0]
	set expcode [list [lindex $args 1]]
    } else {
	set expcode $args
    }

    # A timeout argument takes precedence, otherwise of all the timeouts
    # select the largest.
    upvar #0 timeout gtimeout
    upvar timeout timeout
    if [info exists atimeout] {
	set tmt $atimeout
    } else {
	set tmt 0
	if [info exists timeout] {
	    set tmt $timeout
	}
	if { [info exists gtimeout] && $gtimeout > $tmt } {
	    set tmt $gtimeout
	}
	if { [target_info exists gdb,timeout]
	     && [target_info gdb,timeout] > $tmt } {
	    set tmt [target_info gdb,timeout]
	}
	if { $tmt == 0 } {
	    # Eeeeew.
	    set tmt 60
	}
    }

    global suppress_flag
    global remote_suppress_flag
    if [info exists remote_suppress_flag] {
	set old_val $remote_suppress_flag
    }
    if [info exists suppress_flag] {
	if { $suppress_flag } {
	    set remote_suppress_flag 1
	}
    }
    set code [catch \
	{uplevel remote_expect host $tmt $expcode} string]
    if [info exists old_val] {
	set remote_suppress_flag $old_val
    } else {
	if [info exists remote_suppress_flag] {
	    unset remote_suppress_flag
	}
    }

    if {$code == 1} {
        global errorInfo errorCode

	return -code error -errorinfo $errorInfo -errorcode $errorCode $string
    } else {
	return -code $code $string
    }
}

# gdb_expect_list TEST SENTINEL LIST -- expect a sequence of outputs
#
# Check for long sequence of output by parts.
# TEST: is the test message to be printed with the test success/fail.
# SENTINEL: Is the terminal pattern indicating that output has finished.
# LIST: is the sequence of outputs to match.
# If the sentinel is recognized early, it is considered an error.
#
# Returns:
#    1 if the test failed,
#    0 if the test passes,
#   -1 if there was an internal error.

proc gdb_expect_list {test sentinel list} {
    global gdb_prompt
    global suppress_flag
    set index 0
    set ok 1
    if { $suppress_flag } {
	set ok 0
	unresolved "${test}"
    }
    while { ${index} < [llength ${list}] } {
	set pattern [lindex ${list} ${index}]
        set index [expr ${index} + 1]
	verbose -log "gdb_expect_list pattern: /$pattern/" 2
	if { ${index} == [llength ${list}] } {
	    if { ${ok} } {
		gdb_expect {
		    -re "${pattern}${sentinel}" {
			# pass "${test}, pattern ${index} + sentinel"
		    }
		    -re "${sentinel}" {
			fail "${test} (pattern ${index} + sentinel)"
			set ok 0
		    }
		    -re ".*A problem internal to GDB has been detected" {
			fail "${test} (GDB internal error)"
			set ok 0
			gdb_internal_error_resync
		    }
		    timeout {
			fail "${test} (pattern ${index} + sentinel) (timeout)"
			set ok 0
		    }
		}
	    } else {
		# unresolved "${test}, pattern ${index} + sentinel"
	    }
	} else {
	    if { ${ok} } {
		gdb_expect {
		    -re "${pattern}" {
			# pass "${test}, pattern ${index}"
		    }
		    -re "${sentinel}" {
			fail "${test} (pattern ${index})"
			set ok 0
		    }
		    -re ".*A problem internal to GDB has been detected" {
			fail "${test} (GDB internal error)"
			set ok 0
			gdb_internal_error_resync
		    }
		    timeout {
			fail "${test} (pattern ${index}) (timeout)"
			set ok 0
		    }
		}
	    } else {
		# unresolved "${test}, pattern ${index}"
	    }
	}
    }
    if { ${ok} } {
	pass "${test}"
	return 0
    } else {
	return 1
    }
}

#
#
proc gdb_suppress_entire_file { reason } {
    global suppress_flag

    warning "$reason\n"
    set suppress_flag -1
}

#
# Set suppress_flag, which will cause all subsequent calls to send_gdb and
# gdb_expect to fail immediately (until the next call to 
# gdb_stop_suppressing_tests).
#
proc gdb_suppress_tests { args } {
    global suppress_flag

    return;  # fnf - disable pending review of results where
             # testsuite ran better without this
    incr suppress_flag

    if { $suppress_flag == 1 } {
	if { [llength $args] > 0 } {
	    warning "[lindex $args 0]\n"
	} else {
	    warning "Because of previous failure, all subsequent tests in this group will automatically fail.\n"
	}
    }
}

#
# Clear suppress_flag.
#
proc gdb_stop_suppressing_tests { } {
    global suppress_flag

    if [info exists suppress_flag] {
	if { $suppress_flag > 0 } {
	    set suppress_flag 0
	    clone_output "Tests restarted.\n"
	}
    } else {
	set suppress_flag 0
    }
}

proc gdb_clear_suppressed { } {
    global suppress_flag

    set suppress_flag 0
}

# Spawn the gdb process.
#
# This doesn't expect any output or do any other initialization,
# leaving those to the caller.
#
# Overridable function -- you can override this function in your
# baseboard file.

proc gdb_spawn { } {
    default_gdb_spawn
}

# Spawn GDB with CMDLINE_FLAGS appended to the GDBFLAGS global.

proc gdb_spawn_with_cmdline_opts { cmdline_flags } {
    global GDBFLAGS

    set saved_gdbflags $GDBFLAGS

    append GDBFLAGS $cmdline_flags

    set res [gdb_spawn]

    set GDBFLAGS $saved_gdbflags

    return $res
}

# Start gdb running, wait for prompt, and disable the pagers.

# Overridable function -- you can override this function in your
# baseboard file.

proc gdb_start { } {
    default_gdb_start
}

proc gdb_exit { } {
    catch default_gdb_exit
}

# Return true if we can spawn a program on the target and attach to
# it.

proc can_spawn_for_attach { } {
    # We use TCL's exec to get the inferior's pid.
    if [is_remote target] then {
	return 0
    }

    # The "attach" command doesn't make sense when the target is
    # stub-like, where GDB finds the program already started on
    # initial connection.
    if {[target_info exists use_gdb_stub]} {
	return 0
    }

    # Assume yes.
    return 1
}

# Start a set of programs running and then wait for a bit, to be sure
# that they can be attached to.  Return a list of the processes' PIDs.
# It's a test error to call this when [can_spawn_for_attach] is false.

proc spawn_wait_for_attach { executable_list } {
    set pid_list {}

    if ![can_spawn_for_attach] {
	# The caller should have checked can_spawn_for_attach itself
	# before getting here.
	error "can't spawn for attach with this target/board"
    }

    foreach {executable} $executable_list {
	lappend pid_list [eval exec $executable &]
    }

    sleep 2

    if { [istarget "*-*-cygwin*"] } {
	for {set i 0} {$i < [llength $pid_list]} {incr i} {
	    # testpid is the Cygwin PID, GDB uses the Windows PID,
	    # which might be different due to the way fork/exec works.
	    set testpid [lindex $pid_list $i]
	    set testpid [ exec ps -e | gawk "{ if (\$1 == $testpid) print \$4; }" ]
	    set pid_list [lreplace $pid_list $i $i $testpid]
	}
    }

    return $pid_list
}

#
# gdb_load_cmd -- load a file into the debugger.
#		  ARGS - additional args to load command.
#                 return a -1 if anything goes wrong.
#
proc gdb_load_cmd { args } {
    global gdb_prompt

    if [target_info exists gdb_load_timeout] {
	set loadtimeout [target_info gdb_load_timeout]
    } else {
	set loadtimeout 1600
    }
    send_gdb "load $args\n"
    verbose "Timeout is now $loadtimeout seconds" 2
    gdb_expect $loadtimeout {
	-re "Loading section\[^\r\]*\r\n" {
	    exp_continue
	}
	-re "Start address\[\r\]*\r\n" {
	    exp_continue
	}
	-re "Transfer rate\[\r\]*\r\n" {
	    exp_continue
	}
	-re "Memory access error\[^\r\]*\r\n" {
	    perror "Failed to load program"
	    return -1
	}
	-re "$gdb_prompt $" {
	    return 0
	}
	-re "(.*)\r\n$gdb_prompt " {
	    perror "Unexpected reponse from 'load' -- $expect_out(1,string)"
	    return -1
	}
	timeout {
	    perror "Timed out trying to load $args."
	    return -1
	}
    }
    return -1
}

# Invoke "gcore".  CORE is the name of the core file to write.  TEST
# is the name of the test case.  This will return 1 if the core file
# was created, 0 otherwise.  If this fails to make a core file because
# this configuration of gdb does not support making core files, it
# will call "unsupported", not "fail".  However, if this fails to make
# a core file for some other reason, then it will call "fail".

proc gdb_gcore_cmd {core test} {
    global gdb_prompt

    set result 0
    gdb_test_multiple "gcore $core" $test {
	-re "Saved corefile .*\[\r\n\]+$gdb_prompt $" {
	    pass $test
	    set result 1
	}
	-re "(?:Can't create a corefile|Target does not support core file generation\\.)\[\r\n\]+$gdb_prompt $" {
	    unsupported $test
	}
    }

    return $result
}

# Load core file CORE.  TEST is the name of the test case.
# This will record a pass/fail for loading the core file.
# Returns:
#  1 - core file is successfully loaded
#  0 - core file loaded but has a non fatal error
# -1 - core file failed to load

proc gdb_core_cmd { core test } {
    global gdb_prompt

    gdb_test_multiple "core $core" "$test" {
	-re "\\\[Thread debugging using \[^ \r\n\]* enabled\\\]\r\n" {
	    exp_continue
	}
	-re " is not a core dump:.*\r\n$gdb_prompt $" {
	    fail "$test (bad file format)"
	    return -1
	}
	-re ": No such file or directory.*\r\n$gdb_prompt $" {
	    fail "$test (file not found)"
	    return -1
	}
	-re "Couldn't find .* registers in core file.*\r\n$gdb_prompt $" {
	    fail "$test (incomplete note section)"
	    return 0
	}
	-re "Core was generated by .*\r\n$gdb_prompt $" {
	    pass "$test"
	    return 1
	}
	-re ".*$gdb_prompt $" {
	    fail "$test"
	    return -1
	}
	timeout {
	    fail "$test (timeout)"
	    return -1
	}
    }
    fail "unsupported output from 'core' command"
    return -1
}

# Return the filename to download to the target and load on the target
# for this shared library.  Normally just LIBNAME, unless shared libraries
# for this target have separate link and load images.

proc shlib_target_file { libname } {
    return $libname
}

# Return the filename GDB will load symbols from when debugging this
# shared library.  Normally just LIBNAME, unless shared libraries for
# this target have separate link and load images.

proc shlib_symbol_file { libname } {
    return $libname
}

# Return the filename to download to the target and load for this
# executable.  Normally just BINFILE unless it is renamed to something
# else for this target.

proc exec_target_file { binfile } {
    return $binfile
}

# Return the filename GDB will load symbols from when debugging this
# executable.  Normally just BINFILE unless executables for this target
# have separate files for symbols.

proc exec_symbol_file { binfile } {
    return $binfile
}

# Rename the executable file.  Normally this is just BINFILE1 being renamed
# to BINFILE2, but some targets require multiple binary files.
proc gdb_rename_execfile { binfile1 binfile2 } {
    file rename -force [exec_target_file ${binfile1}] \
		       [exec_target_file ${binfile2}]
    if { [exec_target_file ${binfile1}] != [exec_symbol_file ${binfile1}] } {
	file rename -force [exec_symbol_file ${binfile1}] \
			   [exec_symbol_file ${binfile2}]
    }
}

# "Touch" the executable file to update the date.  Normally this is just
# BINFILE, but some targets require multiple files.
proc gdb_touch_execfile { binfile } {
    set time [clock seconds]
    file mtime [exec_target_file ${binfile}] $time
    if { [exec_target_file ${binfile}] != [exec_symbol_file ${binfile}] } {
	file mtime [exec_symbol_file ${binfile}] $time
    }
}

# Like remote_download but provides a gdb-specific behavior.  If DEST
# is "host", and the host is not remote, and TOFILE is not specified,
# then the [file tail] of FROMFILE is passed through
# standard_output_file to compute the destination.

proc gdb_remote_download {dest fromfile {tofile {}}} {
    if {$dest == "host" && ![is_remote host] && $tofile == ""} {
	set tofile [standard_output_file [file tail $fromfile]]
    }

    if { $tofile == "" } {
	return [remote_download $dest $fromfile]
    } else {
	return [remote_download $dest $fromfile $tofile]
    }
}

# gdb_download
#
# Copy a file to the remote target and return its target filename.
# Schedule the file to be deleted at the end of this test.

proc gdb_download { filename } {
    global cleanfiles

    set destname [remote_download target $filename]
    lappend cleanfiles $destname
    return $destname
}

# gdb_load_shlibs LIB...
#
# Copy the listed libraries to the target.

proc gdb_load_shlibs { args } {
    if {![is_remote target]} {
	return
    }

    foreach file $args {
	gdb_download [shlib_target_file $file]
    }

    # Even if the target supplies full paths for shared libraries,
    # they may not be paths for this system.
    gdb_test "set solib-search-path [file dirname [lindex $args 0]]" "" ""
}

#
# gdb_load -- load a file into the debugger.  Specifying no file
# defaults to the executable currently being debugged.
# The return value is 0 for success, -1 for failure.
# Many files in config/*.exp override this procedure.
#
proc gdb_load { arg } {
    if { $arg != "" } {
	return [gdb_file_cmd $arg]
    }
    return 0
}

# gdb_reload -- load a file into the target.  Called before "running",
# either the first time or after already starting the program once,
# for remote targets.  Most files that override gdb_load should now
# override this instead.

proc gdb_reload { } {
    # For the benefit of existing configurations, default to gdb_load.
    # Specifying no file defaults to the executable currently being
    # debugged.
    return [gdb_load ""]
}

proc gdb_continue { function } {
    global decimal

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

proc default_gdb_init { test_file_name } {
    global gdb_wrapper_initialized
    global gdb_wrapper_target
    global gdb_test_file_name
    global cleanfiles
    global pf_prefix
    
    set cleanfiles {}

    gdb_clear_suppressed

    set gdb_test_file_name [file rootname [file tail $test_file_name]]

    # Make sure that the wrapper is rebuilt
    # with the appropriate multilib option.
    if { $gdb_wrapper_target != [current_target_name] } {
	set gdb_wrapper_initialized 0
    }
    
    # Unlike most tests, we have a small number of tests that generate
    # a very large amount of output.  We therefore increase the expect
    # buffer size to be able to contain the entire test output.  This
    # is especially needed by gdb.base/info-macros.exp.
    match_max -d 65536
    # Also set this value for the currently running GDB. 
    match_max [match_max -d]

    # We want to add the name of the TCL testcase to the PASS/FAIL messages.
    set pf_prefix "[file tail [file dirname $test_file_name]]/[file tail $test_file_name]:"

    global gdb_prompt
    if [target_info exists gdb_prompt] {
	set gdb_prompt [target_info gdb_prompt]
    } else {
	set gdb_prompt "\\(gdb\\)"
    }
    global use_gdb_stub
    if [info exists use_gdb_stub] {
	unset use_gdb_stub
    }
}

# Turn BASENAME into a full file name in the standard output
# directory.  It is ok if BASENAME is the empty string; in this case
# the directory is returned.

proc standard_output_file {basename} {
    global objdir subdir gdb_test_file_name GDB_PARALLEL

    if {[info exists GDB_PARALLEL]} {
	set dir [file join $objdir outputs $subdir $gdb_test_file_name]
	file mkdir $dir
	return [file join $dir $basename]
    } else {
	return [file join $objdir $subdir $basename]
    }
}

# Return the name of a file in our standard temporary directory.

proc standard_temp_file {basename} {
    global objdir GDB_PARALLEL

    if {[info exists GDB_PARALLEL]} {
	return [file join $objdir temp $basename]
    } else {
	return $basename
    }
}

# Set 'testfile', 'srcfile', and 'binfile'.
#
# ARGS is a list of source file specifications.
# Without any arguments, the .exp file's base name is used to
# compute the source file name.  The ".c" extension is added in this case.
# If ARGS is not empty, each entry is a source file specification.
# If the specification starts with a ".", it is treated as a suffix
# to append to the .exp file's base name.
# If the specification is the empty string, it is treated as if it
# were ".c".
# Otherwise it is a file name.
# The first file in the list is used to set the 'srcfile' global.
# Each subsequent name is used to set 'srcfile2', 'srcfile3', etc.
#
# Most tests should call this without arguments.
#
# If a completely different binary file name is needed, then it
# should be handled in the .exp file with a suitable comment.

proc standard_testfile {args} {
    global gdb_test_file_name
    global subdir
    global gdb_test_file_last_vars

    # Outputs.
    global testfile binfile

    set testfile $gdb_test_file_name
    set binfile [standard_output_file ${testfile}]

    if {[llength $args] == 0} {
	set args .c
    }

    # Unset our previous output variables.
    # This can help catch hidden bugs.
    if {[info exists gdb_test_file_last_vars]} {
	foreach varname $gdb_test_file_last_vars {
	    global $varname
	    catch {unset $varname}
	}
    }
    # 'executable' is often set by tests.
    set gdb_test_file_last_vars {executable}

    set suffix ""
    foreach arg $args {
	set varname srcfile$suffix
	global $varname

	# Handle an extension.
	if {$arg == ""} {
	    set arg $testfile.c
	} elseif {[string range $arg 0 0] == "."} {
	    set arg $testfile$arg
	}

	set $varname $arg
	lappend gdb_test_file_last_vars $varname

	if {$suffix == ""} {
	    set suffix 2
	} else {
	    incr suffix
	}
    }
}

# The default timeout used when testing GDB commands.  We want to use
# the same timeout as the default dejagnu timeout, unless the user has
# already provided a specific value (probably through a site.exp file).
global gdb_test_timeout
if ![info exists gdb_test_timeout] {
    set gdb_test_timeout $timeout
}

# A list of global variables that GDB testcases should not use.
# We try to prevent their use by monitoring write accesses and raising
# an error when that happens.
set banned_variables { bug_id prms_id }

# A list of procedures that GDB testcases should not use.
# We try to prevent their use by monitoring invocations and raising
# an error when that happens.
set banned_procedures { strace }

# gdb_init is called by runtest at start, but also by several
# tests directly; gdb_finish is only called from within runtest after
# each test source execution.
# Placing several traces by repetitive calls to gdb_init leads
# to problems, as only one trace is removed in gdb_finish.
# To overcome this possible problem, we add a variable that records
# if the banned variables and procedures are already traced.
set banned_traced 0

proc gdb_init { test_file_name } {
    # Reset the timeout value to the default.  This way, any testcase
    # that changes the timeout value without resetting it cannot affect
    # the timeout used in subsequent testcases.
    global gdb_test_timeout
    global timeout
    set timeout $gdb_test_timeout

    if { [regexp ".*gdb\.reverse\/.*" $test_file_name]
	 && [target_info exists gdb_reverse_timeout] } {
	set timeout [target_info gdb_reverse_timeout]
    }

    # If GDB_INOTIFY is given, check for writes to '.'.  This is a
    # debugging tool to help confirm that the test suite is
    # parallel-safe.  You need "inotifywait" from the
    # inotify-tools package to use this.
    global GDB_INOTIFY inotify_pid
    if {[info exists GDB_INOTIFY] && ![info exists inotify_pid]} {
	global outdir tool inotify_log_file

	set exclusions {outputs temp gdb[.](log|sum) cache}
	set exclusion_re ([join $exclusions |])

	set inotify_log_file [standard_temp_file inotify.out]
	set inotify_pid [exec inotifywait -r -m -e move,create,delete . \
			     --exclude $exclusion_re \
			     |& tee -a $outdir/$tool.log $inotify_log_file &]

	# Wait for the watches; hopefully this is long enough.
	sleep 2

	# Clear the log so that we don't emit a warning the first time
	# we check it.
	set fd [open $inotify_log_file w]
	close $fd
    }

    # Block writes to all banned variables, and invocation of all
    # banned procedures...
    global banned_variables
    global banned_procedures
    global banned_traced
    if (!$banned_traced) {
    	foreach banned_var $banned_variables {
            global "$banned_var"
            trace add variable "$banned_var" write error
	}
	foreach banned_proc $banned_procedures {
	    global "$banned_proc"
	    trace add execution "$banned_proc" enter error
	}
	set banned_traced 1
    }

    # We set LC_ALL, LC_CTYPE, and LANG to C so that we get the same
    # messages as expected.
    setenv LC_ALL C
    setenv LC_CTYPE C
    setenv LANG C

    # Don't let a .inputrc file or an existing setting of INPUTRC mess up
    # the test results.  Even if /dev/null doesn't exist on the particular
    # platform, the readline library will use the default setting just by
    # failing to open the file.  OTOH, opening /dev/null successfully will
    # also result in the default settings being used since nothing will be
    # read from this file.
    setenv INPUTRC "/dev/null"

    # The gdb.base/readline.exp arrow key test relies on the standard VT100
    # bindings, so make sure that an appropriate terminal is selected.
    # The same bug doesn't show up if we use ^P / ^N instead.
    setenv TERM "vt100"

    # Some tests (for example gdb.base/maint.exp) shell out from gdb to use
    # grep.  Clear GREP_OPTIONS to make the behavior predictable,
    # especially having color output turned on can cause tests to fail.
    setenv GREP_OPTIONS ""

    # Clear $gdbserver_reconnect_p.
    global gdbserver_reconnect_p
    set gdbserver_reconnect_p 1
    unset gdbserver_reconnect_p

    return [default_gdb_init $test_file_name]
}

proc gdb_finish { } {
    global gdbserver_reconnect_p
    global gdb_prompt
    global cleanfiles

    # Give persistent gdbserver a chance to terminate before GDB is killed.
    if {[info exists gdbserver_reconnect_p] && $gdbserver_reconnect_p
	&& [info exists gdb_spawn_id]} {
	send_gdb "kill\n";
	gdb_expect 10 {
	    -re "y or n" {
		send_gdb "y\n";
		exp_continue;
	    }
	    -re "$gdb_prompt $" {
	    }
	}
    }

    # Exit first, so that the files are no longer in use.
    gdb_exit

    if { [llength $cleanfiles] > 0 } {
	eval remote_file target delete $cleanfiles
	set cleanfiles {}
    }

    # Unblock write access to the banned variables.  Dejagnu typically
    # resets some of them between testcases.
    global banned_variables
    global banned_procedures
    global banned_traced
    if ($banned_traced) {
    	foreach banned_var $banned_variables {
            global "$banned_var"
            trace remove variable "$banned_var" write error
	}
	foreach banned_proc $banned_procedures {
	    global "$banned_proc"
	    trace remove execution "$banned_proc" enter error
	}
	set banned_traced 0
    }
}

global debug_format
set debug_format "unknown"

# Run the gdb command "info source" and extract the debugging format
# information from the output and save it in debug_format.

proc get_debug_format { } {
    global gdb_prompt
    global verbose
    global expect_out
    global debug_format

    set debug_format "unknown"
    send_gdb "info source\n"
    gdb_expect 10 {
	-re "Compiled with (.*) debugging format.\r\n.*$gdb_prompt $" {
	    set debug_format $expect_out(1,string)
	    verbose "debug format is $debug_format"
	    return 1
	}
	-re "No current source file.\r\n$gdb_prompt $" {
	    perror "get_debug_format used when no current source file"
	    return 0
	}
	-re "$gdb_prompt $" {
	    warning "couldn't check debug format (no valid response)."
	    return 1
	}
	timeout {
	    warning "couldn't check debug format (timeout)."
	    return 1
	}
    }
}

# Return true if FORMAT matches the debug format the current test was
# compiled with.  FORMAT is a shell-style globbing pattern; it can use
# `*', `[...]', and so on.
#
# This function depends on variables set by `get_debug_format', above.

proc test_debug_format {format} {
    global debug_format

    return [expr [string match $format $debug_format] != 0]
}

# Like setup_xfail, but takes the name of a debug format (DWARF 1,
# COFF, stabs, etc).  If that format matches the format that the
# current test was compiled with, then the next test is expected to
# fail for any target.  Returns 1 if the next test or set of tests is
# expected to fail, 0 otherwise (or if it is unknown).  Must have
# previously called get_debug_format.
proc setup_xfail_format { format } {
    set ret [test_debug_format $format]

    if {$ret} then {
	setup_xfail "*-*-*"
    }
    return $ret
}

# gdb_get_line_number TEXT [FILE]
#
# Search the source file FILE, and return the line number of the
# first line containing TEXT.  If no match is found, an error is thrown.
# 
# TEXT is a string literal, not a regular expression.
#
# The default value of FILE is "$srcdir/$subdir/$srcfile".  If FILE is
# specified, and does not start with "/", then it is assumed to be in
# "$srcdir/$subdir".  This is awkward, and can be fixed in the future,
# by changing the callers and the interface at the same time.
# In particular: gdb.base/break.exp, gdb.base/condbreak.exp,
# gdb.base/ena-dis-br.exp.
#
# Use this function to keep your test scripts independent of the
# exact line numbering of the source file.  Don't write:
# 
#   send_gdb "break 20"
# 
# This means that if anyone ever edits your test's source file, 
# your test could break.  Instead, put a comment like this on the
# source file line you want to break at:
# 
#   /* breakpoint spot: frotz.exp: test name */
# 
# and then write, in your test script (which we assume is named
# frotz.exp):
# 
#   send_gdb "break [gdb_get_line_number "frotz.exp: test name"]\n"
#
# (Yes, Tcl knows how to handle the nested quotes and brackets.
# Try this:
# 	$ tclsh
# 	% puts "foo [lindex "bar baz" 1]"
# 	foo baz
# 	% 
# Tcl is quite clever, for a little stringy language.)
#
# ===
#
# The previous implementation of this procedure used the gdb search command.
# This version is different:
#
#   . It works with MI, and it also works when gdb is not running.
#
#   . It operates on the build machine, not the host machine.
#
#   . For now, this implementation fakes a current directory of
#     $srcdir/$subdir to be compatible with the old implementation.
#     This will go away eventually and some callers will need to
#     be changed.
#
#   . The TEXT argument is literal text and matches literally,
#     not a regular expression as it was before.
#
#   . State changes in gdb, such as changing the current file
#     and setting $_, no longer happen.
#
# After a bit of time we can forget about the differences from the
# old implementation.
#
# --chastain 2004-08-05

proc gdb_get_line_number { text { file "" } } {
    global srcdir
    global subdir
    global srcfile

    if { "$file" == "" } then {
	set file "$srcfile"
    }
    if { ! [regexp "^/" "$file"] } then {
	set file "$srcdir/$subdir/$file"
    }

    if { [ catch { set fd [open "$file"] } message ] } then {
	error "$message"
    }

    set found -1
    for { set line 1 } { 1 } { incr line } {
	if { [ catch { set nchar [gets "$fd" body] } message ] } then {
	    error "$message"
	}
	if { $nchar < 0 } then {
	    break
	}
	if { [string first "$text" "$body"] >= 0 } then {
	    set found $line
	    break
	}
    }

    if { [ catch { close "$fd" } message ] } then {
	error "$message"
    }

    if {$found == -1} {
        error "undefined tag \"$text\""
    }

    return $found
}

# Continue the program until it ends.
#
# MSSG is the error message that gets printed.  If not given, a
#	default is used.
# COMMAND is the command to invoke.  If not given, "continue" is
#	used.
# ALLOW_EXTRA is a flag indicating whether the test should expect
#	extra output between the "Continuing." line and the program
#	exiting.  By default it is zero; if nonzero, any extra output
#	is accepted.

proc gdb_continue_to_end {{mssg ""} {command continue} {allow_extra 0}} {
  global inferior_exited_re use_gdb_stub

  if {$mssg == ""} {
      set text "continue until exit"
  } else {
      set text "continue until exit at $mssg"
  }
  if {$allow_extra} {
      set extra ".*"
  } else {
      set extra ""
  }

  # By default, we don't rely on exit() behavior of remote stubs --
  # it's common for exit() to be implemented as a simple infinite
  # loop, or a forced crash/reset.  For native targets, by default, we
  # assume process exit is reported as such.  If a non-reliable target
  # is used, we set a breakpoint at exit, and continue to that.
  if { [target_info exists exit_is_reliable] } {
      set exit_is_reliable [target_info exit_is_reliable]
  } else {
      set exit_is_reliable [expr ! $use_gdb_stub]
  }

  if { ! $exit_is_reliable } {
    if {![gdb_breakpoint "exit"]} {
      return 0
    }
    gdb_test $command "Continuing..*Breakpoint .*exit.*" \
	$text
  } else {
    # Continue until we exit.  Should not stop again.
    # Don't bother to check the output of the program, that may be
    # extremely tough for some remote systems.
    gdb_test $command \
      "Continuing.\[\r\n0-9\]+${extra}(... EXIT code 0\[\r\n\]+|$inferior_exited_re normally).*"\
	$text
  }
}

proc rerun_to_main {} {
  global gdb_prompt use_gdb_stub

  if $use_gdb_stub {
    gdb_run_cmd
    gdb_expect {
      -re ".*Breakpoint .*main .*$gdb_prompt $"\
	      {pass "rerun to main" ; return 0}
      -re "$gdb_prompt $"\
	      {fail "rerun to main" ; return 0}
      timeout {fail "(timeout) rerun to main" ; return 0}
    }
  } else {
    send_gdb "run\n"
    gdb_expect {
      -re "The program .* has been started already.*y or n. $" {
	  send_gdb "y\n"
	  exp_continue
      }
      -re "Starting program.*$gdb_prompt $"\
	      {pass "rerun to main" ; return 0}
      -re "$gdb_prompt $"\
	      {fail "rerun to main" ; return 0}
      timeout {fail "(timeout) rerun to main" ; return 0}
    }
  }
}

# Print a message and return true if a test should be skipped
# due to lack of floating point suport.

proc gdb_skip_float_test { msg } {
    if [target_info exists gdb,skip_float_tests] {
	verbose "Skipping test '$msg': no float tests."
	return 1
    }
    return 0
}

# Print a message and return true if a test should be skipped
# due to lack of stdio support.

proc gdb_skip_stdio_test { msg } {
    if [target_info exists gdb,noinferiorio] {
	verbose "Skipping test '$msg': no inferior i/o."
	return 1
    }
    return 0
}

proc gdb_skip_bogus_test { msg } {
    return 0
}

# Return true if a test should be skipped due to lack of XML support
# in the host GDB.
# NOTE: This must be called while gdb is *not* running.

gdb_caching_proc gdb_skip_xml_test {
    global gdb_prompt
    global srcdir

    set xml_file [gdb_remote_download host "${srcdir}/gdb.xml/trivial.xml"]

    gdb_start
    set xml_missing 0
    gdb_test_multiple "set tdesc filename $xml_file" "" {
	-re ".*XML support was disabled at compile time.*$gdb_prompt $" {
	    set xml_missing 1
	}
	-re ".*$gdb_prompt $" { }
    }
    gdb_exit
    return $xml_missing
}

# Return true if argv[0] is available.

gdb_caching_proc gdb_has_argv0 {
    set result 0

    # Set up, compile, and execute a test program to check whether
    # argv[0] is available.
    set src [standard_temp_file has_argv0[pid].c]
    set exe [standard_temp_file has_argv0[pid].x]

    gdb_produce_source $src {
	int main (int argc, char **argv) {
	    return 0;
	}
    }

    gdb_compile $src $exe executable {debug}

    # Helper proc.
    proc gdb_has_argv0_1 { exe } {
	global srcdir subdir
	global gdb_prompt hex

	gdb_exit
	gdb_start
	gdb_reinitialize_dir $srcdir/$subdir
	gdb_load "$exe"

	# Set breakpoint on main.
	gdb_test_multiple "break main" "break main" {
	    -re "Breakpoint.*${gdb_prompt} $" {
	    }
	    -re "${gdb_prompt} $" {
		return 0
	    }
	}

	# Run to main.
	gdb_run_cmd
	gdb_test_multiple "" "run to main" {
	    -re "Breakpoint.*${gdb_prompt} $" {
	    }
	    -re "${gdb_prompt} $" {
		return 0
	    }
	}

	# Check whether argc is 1.
	gdb_test_multiple "p argc" "p argc" {
	    -re " = 1\r\n${gdb_prompt} $" {

		gdb_test_multiple "p argv\[0\]" "p argv\[0\]" {
		    -re " = $hex \".*[file tail $exe]\"\r\n${gdb_prompt} $" {
			return 1
		    }
		    -re "${gdb_prompt} $" {
			return 0
		    }
		}
	    }
	    -re "${gdb_prompt} $" {
		return 0
	    }
	}
	return 0
    }

    set result [gdb_has_argv0_1 $exe]

    gdb_exit
    file delete $src
    file delete $exe

    if { !$result
      && ([istarget *-*-linux*]
	  || [istarget *-*-freebsd*] || [istarget *-*-kfreebsd*]
	  || [istarget *-*-netbsd*] || [istarget *-*-knetbsd*]
	  || [istarget *-*-openbsd*]
	  || [istarget *-*-darwin*]
	  || [istarget *-*-solaris*]
	  || [istarget *-*-aix*]
	  || [istarget *-*-gnu*]
	  || [istarget *-*-cygwin*] || [istarget *-*-mingw32*]
	  || [istarget *-*-*djgpp*] || [istarget *-*-go32*]
	  || [istarget *-wince-pe] || [istarget *-*-mingw32ce*]
	  || [istarget *-*-symbianelf*]
	  || [istarget *-*-osf*]
	  || [istarget *-*-hpux*]
	  || [istarget *-*-dicos*]
	  || [istarget *-*-nto*]
	  || [istarget *-*-*vms*]
	  || [istarget *-*-lynx*178]) } {
	fail "argv\[0\] should be available on this target"
    }

    return $result
}

# Note: the procedure gdb_gnu_strip_debug will produce an executable called
# ${binfile}.dbglnk, which is just like the executable ($binfile) but without
# the debuginfo. Instead $binfile has a .gnu_debuglink section which contains
# the name of a debuginfo only file. This file will be stored in the same
# subdirectory.

# Functions for separate debug info testing

# starting with an executable:
# foo --> original executable

# at the end of the process we have:
# foo.stripped --> foo w/o debug info
# foo.debug --> foo's debug info
# foo --> like foo, but with a new .gnu_debuglink section pointing to foo.debug.

# Fetch the build id from the file.
# Returns "" if there is none.

proc get_build_id { filename } {
    set tmp [standard_output_file "${filename}-tmp"]
    set objcopy_program [gdb_find_objcopy]

    set result [catch "exec $objcopy_program -j .note.gnu.build-id -O binary $filename $tmp" output]
    verbose "result is $result"
    verbose "output is $output"
    if {$result == 1} {
	return ""
    }
    set fi [open $tmp]
    fconfigure $fi -translation binary
    # Skip the NOTE header.
    read $fi 16
    set data [read $fi]
    close $fi
    file delete $tmp
    if ![string compare $data ""] then {
	return ""
    }
    # Convert it to hex.
    binary scan $data H* data
    return $data
}

# Return the build-id hex string (usually 160 bits as 40 hex characters)
# converted to the form: .build-id/ab/cdef1234...89.debug
# Return "" if no build-id found.
proc build_id_debug_filename_get { filename } {
    set data [get_build_id $filename]
    if { $data == "" } {
	return ""
    }
    regsub {^..} $data {\0/} data
    return ".build-id/${data}.debug"
}

# Create stripped files for DEST, replacing it.  If ARGS is passed, it is a
# list of optional flags.  The only currently supported flag is no-main,
# which removes the symbol entry for main from the separate debug file.
#
# Function returns zero on success.  Function will return non-zero failure code
# on some targets not supporting separate debug info (such as i386-msdos).

proc gdb_gnu_strip_debug { dest args } {

    # Use the first separate debug info file location searched by GDB so the
    # run cannot be broken by some stale file searched with higher precedence.
    set debug_file "${dest}.debug"

    set strip_to_file_program [transform strip]
    set objcopy_program [gdb_find_objcopy]

    set debug_link [file tail $debug_file]
    set stripped_file "${dest}.stripped"

    # Get rid of the debug info, and store result in stripped_file
    # something like gdb/testsuite/gdb.base/blah.stripped.
    set result [catch "exec $strip_to_file_program --strip-debug ${dest} -o ${stripped_file}" output]
    verbose "result is $result"
    verbose "output is $output"
    if {$result == 1} {
      return 1
    }

    # Workaround PR binutils/10802:
    # Preserve the 'x' bit also for PIEs (Position Independent Executables).
    set perm [file attributes ${dest} -permissions]
    file attributes ${stripped_file} -permissions $perm

    # Get rid of everything but the debug info, and store result in debug_file
    # This will be in the .debug subdirectory, see above.
    set result [catch "exec $strip_to_file_program --only-keep-debug ${dest} -o ${debug_file}" output]
    verbose "result is $result"
    verbose "output is $output"
    if {$result == 1} {
      return 1
    }

    # If no-main is passed, strip the symbol for main from the separate
    # file.  This is to simulate the behavior of elfutils's eu-strip, which
    # leaves the symtab in the original file only.  There's no way to get
    # objcopy or strip to remove the symbol table without also removing the
    # debugging sections, so this is as close as we can get.
    if { [llength $args] == 1 && [lindex $args 0] == "no-main" } {
	set result [catch "exec $objcopy_program -N main ${debug_file} ${debug_file}-tmp" output]
	verbose "result is $result"
	verbose "output is $output"
	if {$result == 1} {
	    return 1
	}
	file delete "${debug_file}"
	file rename "${debug_file}-tmp" "${debug_file}"
    }

    # Link the two previous output files together, adding the .gnu_debuglink
    # section to the stripped_file, containing a pointer to the debug_file,
    # save the new file in dest.
    # This will be the regular executable filename, in the usual location.
    set result [catch "exec $objcopy_program --add-gnu-debuglink=${debug_file} ${stripped_file} ${dest}" output]
    verbose "result is $result"
    verbose "output is $output"
    if {$result == 1} {
      return 1
    }

    # Workaround PR binutils/10802:
    # Preserve the 'x' bit also for PIEs (Position Independent Executables).
    set perm [file attributes ${stripped_file} -permissions]
    file attributes ${dest} -permissions $perm

    return 0
}

# Test the output of GDB_COMMAND matches the pattern obtained
# by concatenating all elements of EXPECTED_LINES.  This makes
# it possible to split otherwise very long string into pieces.
# If third argument is not empty, it's used as the name of the
# test to be printed on pass/fail.
proc help_test_raw { gdb_command expected_lines args } {
    set message $gdb_command
    if [llength $args]>0 then {
	set message [lindex $args 0]
    } 
    set expected_output [join $expected_lines ""]
    gdb_test "${gdb_command}" "${expected_output}" $message
}

# Test the output of "help COMMAND_CLASS". EXPECTED_INITIAL_LINES
# are regular expressions that should match the beginning of output,
# before the list of commands in that class.  The presence of 
# command list and standard epilogue will be tested automatically.
proc test_class_help { command_class expected_initial_lines args } {
    set l_stock_body {
        "List of commands\:.*\[\r\n\]+"
        "Type \"help\" followed by command name for full documentation\.\[\r\n\]+"
        "Type \"apropos word\" to search for commands related to \"word\"\.[\r\n\]+"
        "Command name abbreviations are allowed if unambiguous\." 
    }
    set l_entire_body [concat $expected_initial_lines $l_stock_body]

    eval [list help_test_raw "help ${command_class}" $l_entire_body] $args
}

# COMMAND_LIST should have either one element -- command to test, or
# two elements -- abbreviated command to test, and full command the first
# element is abbreviation of.
# The command must be a prefix command.  EXPECTED_INITIAL_LINES
# are regular expressions that should match the beginning of output,
# before the list of subcommands.  The presence of 
# subcommand list and standard epilogue will be tested automatically.
proc test_prefix_command_help { command_list expected_initial_lines args } {
    set command [lindex $command_list 0]   
    if {[llength $command_list]>1} {        
        set full_command [lindex $command_list 1]
    } else {
        set full_command $command
    }
    # Use 'list' and not just {} because we want variables to
    # be expanded in this list.
    set l_stock_body [list\
         "List of $full_command subcommands\:.*\[\r\n\]+"\
         "Type \"help $full_command\" followed by $full_command subcommand name for full documentation\.\[\r\n\]+"\
         "Type \"apropos word\" to search for commands related to \"word\"\.\[\r\n\]+"\
         "Command name abbreviations are allowed if unambiguous\."]
    set l_entire_body [concat $expected_initial_lines $l_stock_body]
    if {[llength $args]>0} {
        help_test_raw "help ${command}" $l_entire_body [lindex $args 0]
    } else {
        help_test_raw "help ${command}" $l_entire_body
    }
}

# Build executable named EXECUTABLE from specifications that allow
# different options to be passed to different sub-compilations.
# TESTNAME is the name of the test; this is passed to 'untested' if
# something fails.
# OPTIONS is passed to the final link, using gdb_compile.  If OPTIONS
# contains the option "pthreads", then gdb_compile_pthreads is used.
# ARGS is a flat list of source specifications, of the form:
#    { SOURCE1 OPTIONS1 [ SOURCE2 OPTIONS2 ]... }
# Each SOURCE is compiled to an object file using its OPTIONS,
# using gdb_compile.
# Returns 0 on success, -1 on failure.
proc build_executable_from_specs {testname executable options args} {
    global subdir
    global srcdir

    set binfile [standard_output_file $executable]

    set info_options ""
    if { [lsearch -exact $options "c++"] >= 0 } {
	set info_options "c++"
    }
    if [get_compiler_info ${info_options}] {
        return -1
    }

    set func gdb_compile
    set func_index [lsearch -regexp $options {^(pthreads|shlib|shlib_pthreads)$}]
    if {$func_index != -1} {
	set func "${func}_[lindex $options $func_index]"
    }

    # gdb_compile_shlib and gdb_compile_shlib_pthreads do not use the 3rd
    # parameter.  They also requires $sources while gdb_compile and
    # gdb_compile_pthreads require $objects.  Moreover they ignore any options.
    if [string match gdb_compile_shlib* $func] {
	set sources_path {}
	foreach {s local_options} $args {
	    if { [regexp "^/" "$s"] } then {
		lappend sources_path "$s"
	    } else {
		lappend sources_path "$srcdir/$subdir/$s"
	    }
	}
	set ret [$func $sources_path "${binfile}" $options]
    } else {
	set objects {}
	set i 0
	foreach {s local_options} $args {
	    if { ! [regexp "^/" "$s"] } then {
		set s "$srcdir/$subdir/$s"
	    }
	    if  { [gdb_compile "${s}" "${binfile}${i}.o" object $local_options] != "" } {
		untested $testname
		return -1
	    }
	    lappend objects "${binfile}${i}.o"
	    incr i
	}
	set ret [$func $objects "${binfile}" executable $options]
    }
    if  { $ret != "" } {
        untested $testname
        return -1
    }

    return 0
}

# Build executable named EXECUTABLE, from SOURCES.  If SOURCES are not
# provided, uses $EXECUTABLE.c.  The TESTNAME paramer is the name of test
# to pass to untested, if something is wrong.  OPTIONS are passed
# to gdb_compile directly.
proc build_executable { testname executable {sources ""} {options {debug}} } {
    if {[llength $sources]==0} {
        set sources ${executable}.c
    }

    set arglist [list $testname $executable $options]
    foreach source $sources {
	lappend arglist $source $options
    }

    return [eval build_executable_from_specs $arglist]
}

# Starts fresh GDB binary and loads EXECUTABLE into GDB. EXECUTABLE is
# the basename of the binary.
proc clean_restart { executable } {
    global srcdir
    global subdir
    set binfile [standard_output_file ${executable}]

    gdb_exit
    gdb_start
    gdb_reinitialize_dir $srcdir/$subdir
    gdb_load ${binfile}
}

# Prepares for testing by calling build_executable_full, then
# clean_restart.
# TESTNAME is the name of the test.
# Each element in ARGS is a list of the form
#    { EXECUTABLE OPTIONS SOURCE_SPEC... }
# These are passed to build_executable_from_specs, which see.
# The last EXECUTABLE is passed to clean_restart.
# Returns 0 on success, non-zero on failure.
proc prepare_for_testing_full {testname args} {
    foreach spec $args {
	if {[eval build_executable_from_specs [list $testname] $spec] == -1} {
	    return -1
	}
	set executable [lindex $spec 0]
    }
    clean_restart $executable
    return 0
}

# Prepares for testing, by calling build_executable, and then clean_restart.
# Please refer to build_executable for parameter description.
proc prepare_for_testing { testname executable {sources ""} {options {debug}}} {

    if {[build_executable $testname $executable $sources $options] == -1} {
        return -1
    }
    clean_restart $executable

    return 0
}

proc get_valueof { fmt exp default } {
    global gdb_prompt

    set test "get valueof \"${exp}\""
    set val ${default}
    gdb_test_multiple "print${fmt} ${exp}" "$test" {
	-re "\\$\[0-9\]* = (.*)\[\r\n\]*$gdb_prompt $" {
	    set val $expect_out(1,string)
	    pass "$test ($val)"
	}
	timeout {
	    fail "$test (timeout)"
	}
    }
    return ${val}
}

proc get_integer_valueof { exp default } {
    global gdb_prompt

    set test "get integer valueof \"${exp}\""
    set val ${default}
    gdb_test_multiple "print /d ${exp}" "$test" {
	-re "\\$\[0-9\]* = (\[-\]*\[0-9\]*).*$gdb_prompt $" {
	    set val $expect_out(1,string)
	    pass "$test ($val)"
	}
	timeout {
	    fail "$test (timeout)"
	}
    }
    return ${val}
}

proc get_hexadecimal_valueof { exp default } {
    global gdb_prompt
    send_gdb "print /x ${exp}\n"
    set test "get hexadecimal valueof \"${exp}\""
    gdb_expect {
	-re "\\$\[0-9\]* = (0x\[0-9a-zA-Z\]+).*$gdb_prompt $" {
	    set val $expect_out(1,string)
	    pass "$test"
	}
	timeout {
	    set val ${default}
	    fail "$test (timeout)"
	}
    }
    return ${val}
}

proc get_sizeof { type default } {
    return [get_integer_valueof "sizeof (${type})" $default]
}

proc get_target_charset { } {
    global gdb_prompt

    gdb_test_multiple "show target-charset" "" {
	-re "The target character set is \"auto; currently (\[^\"\]*)\".*$gdb_prompt $" {
	    return $expect_out(1,string)
	}
	-re "The target character set is \"(\[^\"\]*)\".*$gdb_prompt $" {
	    return $expect_out(1,string)
	}
    }

    # Pick a reasonable default.
    warning "Unable to read target-charset."
    return "UTF-8"
}

# Get the current value for remotetimeout and return it.
proc get_remotetimeout { } {
    global gdb_prompt
    global decimal

    gdb_test_multiple "show remotetimeout" "" {
	-re "Timeout limit to wait for target to respond is ($decimal).*$gdb_prompt $" {
	    return $expect_out(1,string)
	}
    }

    # Pick the default that gdb uses
    warning "Unable to read remotetimeout"
    return 300
}

# Set the remotetimeout to the specified timeout.  Nothing is returned.
proc set_remotetimeout { timeout } {
    global gdb_prompt

    gdb_test_multiple "set remotetimeout $timeout" "" {
	-re "$gdb_prompt $" {
	    verbose "Set remotetimeout to $timeout\n"
	}
    }
}

# ROOT and FULL are file names.  Returns the relative path from ROOT
# to FULL.  Note that FULL must be in a subdirectory of ROOT.
# For example, given ROOT = /usr/bin and FULL = /usr/bin/ls, this
# will return "ls".

proc relative_filename {root full} {
    set root_split [file split $root]
    set full_split [file split $full]

    set len [llength $root_split]

    if {[eval file join $root_split]
	!= [eval file join [lrange $full_split 0 [expr {$len - 1}]]]} {
	error "$full not a subdir of $root"
    }

    return [eval file join [lrange $full_split $len end]]
}

# Log gdb command line and script if requested.
if {[info exists TRANSCRIPT]} {
  rename send_gdb real_send_gdb
  rename remote_spawn real_remote_spawn
  rename remote_close real_remote_close

  global gdb_transcript
  set gdb_transcript ""

  global gdb_trans_count
  set gdb_trans_count 1

  proc remote_spawn {args} {
    global gdb_transcript gdb_trans_count outdir

    if {$gdb_transcript != ""} {
      close $gdb_transcript
    }
    set gdb_transcript [open [file join $outdir transcript.$gdb_trans_count] w]
    puts $gdb_transcript [lindex $args 1]
    incr gdb_trans_count

    return [uplevel real_remote_spawn $args]
  }

  proc remote_close {args} {
    global gdb_transcript

    if {$gdb_transcript != ""} {
      close $gdb_transcript
      set gdb_transcript ""
    }

    return [uplevel real_remote_close $args]
  }

  proc send_gdb {args} {
    global gdb_transcript

    if {$gdb_transcript != ""} {
      puts -nonewline $gdb_transcript [lindex $args 0]
    }

    return [uplevel real_send_gdb $args]
  }
}

# If GDB_PARALLEL exists, then set up the parallel-mode directories.
if {[info exists GDB_PARALLEL]} {
    if {[is_remote host]} {
	unset GDB_PARALLEL
    } else {
	file mkdir outputs temp cache
    }
}

proc core_find {binfile {deletefiles {}} {arg ""}} {
    global objdir subdir

    set destcore "$binfile.core"
    file delete $destcore

    # Create a core file named "$destcore" rather than just "core", to
    # avoid problems with sys admin types that like to regularly prune all
    # files named "core" from the system.
    #
    # Arbitrarily try setting the core size limit to "unlimited" since
    # this does not hurt on systems where the command does not work and
    # allows us to generate a core on systems where it does.
    #
    # 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 [standard_output_file coredir.[getpid]]
    file mkdir $coredir
    catch "system \"(cd ${coredir}; ulimit -c unlimited; ${binfile} ${arg}; true) >/dev/null 2>&1\""
    #      remote_exec host "${binfile}"
    foreach i "${coredir}/core ${coredir}/core.coremaker.c ${binfile}.core" {
	if [remote_file build exists $i] {
	    remote_exec build "mv $i $destcore"
	    set found 1
	}
    }
    # Check for "core.PID".
    if { $found == 0 } {
	set names [glob -nocomplain -directory $coredir core.*]
	if {[llength $names] == 1} {
	    set corefile [file join $coredir [lindex $names 0]]
	    remote_exec build "mv $corefile $destcore"
	    set found 1
	}
    }
    if { $found == 0 } {
	# The braindamaged HPUX shell quits after the ulimit -c above
	# without executing ${binfile}.  So we try again without the
	# ulimit here if we didn't find a core file above.
	# Oh, I should mention that any "braindamaged" non-Unix system has
	# the same problem. I like the cd bit too, it's really neat'n stuff.
	catch "system \"(cd ${objdir}/${subdir}; ${binfile}; true) >/dev/null 2>&1\""
	foreach i "${objdir}/${subdir}/core ${objdir}/${subdir}/core.coremaker.c ${binfile}.core" {
	    if [remote_file build exists $i] {
		remote_exec build "mv $i $destcore"
		set found 1
	    }
	}
    }

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

# gdb_target_symbol_prefix_flags returns a string that can be added
# to gdb_compile options to define SYMBOL_PREFIX macro value
# symbol_prefix_flags returns a string that can be added
# for targets that use underscore as symbol prefix.
# TODO: find out automatically if the target needs this.

proc gdb_target_symbol_prefix_flags {} {
    if { [istarget "i?86-*-cygwin*"] || [istarget "i?86-*-mingw*"]
	 || [istarget "*-*-msdosdjgpp*"] || [istarget "*-*-go32*"] } {
	return "additional_flags=-DSYMBOL_PREFIX=\"_\""
    } else {
	return ""
    }
}

# A wrapper for 'remote_exec host' that passes or fails a test.
# Returns 0 if all went well, nonzero on failure.
# TEST is the name of the test, other arguments are as for remote_exec.

proc run_on_host { test program args } {
    verbose -log "run_on_host: $program $args"
    # remote_exec doesn't work properly if the output is set but the
    # input is the empty string -- so replace an empty input with
    # /dev/null.
    if {[llength $args] > 1 && [lindex $args 1] == ""} {
	set args [lreplace $args 1 1 "/dev/null"]
    }
    set result [eval remote_exec host [list $program] $args]
    verbose "result is $result"
    set status [lindex $result 0]
    set output [lindex $result 1]
    if {$status == 0} {
 	pass $test
 	return 0
    } else {
	verbose -log "run_on_host failed: $output"
	fail $test
	return -1
    }
}

# Return non-zero if "board_info debug_flags" mentions Fission.
# http://gcc.gnu.org/wiki/DebugFission
# Fission doesn't support everything yet.
# This supports working around bug 15954.

proc using_fission { } {
    set debug_flags [board_info [target_info name] debug_flags]
    return [regexp -- "-gsplit-dwarf" $debug_flags]
}

# Search the caller's ARGS list and set variables according to the list of
# valid options described by ARGSET.
#
# The first member of each one- or two-element list in ARGSET defines the
# name of a variable that will be added to the caller's scope.
#
# If only one element is given to describe an option, it the value is
# 0 if the option is not present in (the caller's) ARGS or 1 if
# it is.
#
# If two elements are given, the second element is the default value of
# the variable.  This is then overwritten if the option exists in ARGS.
#
# Any parse_args elements in (the caller's) ARGS will be removed, leaving
# any optional components.

# Example:
# proc myproc {foo args} {
#  parse_args {{bar} {baz "abc"} {qux}}
#    # ...
# }
# myproc ABC -bar -baz DEF peanut butter
# will define the following variables in myproc:
# foo (=ABC), bar (=1), baz (=DEF), and qux (=0)
# args will be the list {peanut butter}

proc parse_args { argset } {
    upvar args args

    foreach argument $argset {
        if {[llength $argument] == 1} {
            # No default specified, so we assume that we should set
            # the value to 1 if the arg is present and 0 if it's not.
            # It is assumed that no value is given with the argument.
            set result [lsearch -exact $args "-$argument"]
            if {$result != -1} then {
                uplevel 1 [list set $argument 1]
                set args [lreplace $args $result $result]
            } else {
                uplevel 1 [list set $argument 0]
            }
        } elseif {[llength $argument] == 2} {
            # There are two items in the argument.  The second is a
            # default value to use if the item is not present.
            # Otherwise, the variable is set to whatever is provided
            # after the item in the args.
            set arg [lindex $argument 0]
            set result [lsearch -exact $args "-[lindex $arg 0]"]
            if {$result != -1} then {
                uplevel 1 [list set $arg [lindex $args [expr $result+1]]]
                set args [lreplace $args $result [expr $result+1]]
            } else {
                uplevel 1 [list set $arg [lindex $argument 1]]
            }
        } else {
            error "Badly formatted argument \"$argument\" in argument set"
        }
    }

    # The remaining args should be checked to see that they match the
    # number of items expected to be passed into the procedure...
}

# Capture the output of COMMAND in a string ignoring PREFIX; return that string.
proc capture_command_output { command prefix } {
    global gdb_prompt
    global expect_out

    set output_string ""
    gdb_test_multiple "$command" "capture_command_output for $command" {
	-re "${command}\[\r\n\]+${prefix}(.*)\[\r\n\]+$gdb_prompt $" {
	    set output_string $expect_out(1,string)
	}
    }
    return $output_string
}

# A convenience function that joins all the arguments together, with a
# regexp that matches exactly one end of line in between each argument.
# This function is ideal to write the expected output of a GDB command
# that generates more than a couple of lines, as this allows us to write
# each line as a separate string, which is easier to read by a human
# being.

proc multi_line { args } {
    return [join $args "\r\n"]
}

# Always load compatibility stuff.
load_lib future.exp