[gdb/testsuite] Fail in gdb_compile if nopie results in PIE executable

[deliverable/binutils-gdb.git] / gdb / testsuite / lib / gdb.exp

# Copyright 1992-2019 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
load_lib memory.exp

global GDB

# The spawn ID used for I/O interaction with the inferior.  For native
# targets, or remote targets that can do I/O through GDB
# (semi-hosting) this will be the same as the host/GDB's spawn ID.
# Otherwise, the board may set this to some other spawn ID.  E.g.,
# when debugging with GDBserver, this is set to GDBserver's spawn ID,
# so input/output is done on gdbserver's tty.
global inferior_spawn_id

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 \
    "--Type <RET> for more, q to quit, c to continue without paging--"

# 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)"

# A regular expression that matches a value history number.
# E.g., $1, $2, etc.
set valnum_re "\\\$$decimal"

### 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. $" {
            send_gdb "y\n" answer
            exp_continue
        }
        -re "Discard symbol table from .*y or n.*$" {
            send_gdb "y\n" answer
            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" answer
            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"
    }
}

# Returns true iff the target supports using the "run" command.

proc target_can_use_run_cmd {} {
    if [target_info exists use_gdb_stub] {
        # In this case, when we connect, the inferior is already
        # running.
        return 0
    }

    # Assume yes.
    return 1
}

# 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. $" {
                    send_gdb "y\n" answer
                }
                -re "The program is not being run.*$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" answer
            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" answer
            exp_continue
        }
        -notransfer -re "Starting program: \[^\r\n\]*" {
            return 0
        }
    }
    return -1
}

# Generic starti 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_starti_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 "starti $args\n"
    gdb_expect 60 {
        -re "The program .* has been started already.*y or n. $" {
            send_gdb "y\n" answer
            exp_continue
        }
        -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, passfail and qualified.
# 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"
    }

    if {[lsearch -exact $args qualified] != -1} {
        append break_command " -qualified"
    }

    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" answer
                incr count
            }
            -re "Create a core file of GDB\\? \\(y or n\\) $" {
                send_gdb "n\n" answer
                incr count
            }
            -re "$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 PROMPT_REGEXP
# 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.
# PROMPT_REGEXP is a regexp matching the expected prompt after the command
#   output.  If empty, defaults to "$gdb_prompt $"
#
# Returns:
#    1 if the test failed, according to a built-in failure pattern
#    0 if only user-supplied patterns matched
#   -1 if there was an internal error.
#  
# You can use this function thus:
#
# gdb_test_multiple "print foo" "test foo" {
#    -re "expected output 1" {
#        pass "print foo"
#    }
#    -re "expected output 2" {
#        fail "print foo"
#    }
# }
#
# Like with "expect", you can also specify the spawn id to match with
# -i "$id".  Interesting spawn ids are $inferior_spawn_id and
# $gdb_spawn_id.  The former matches inferior I/O, while the latter
# matches GDB I/O.  E.g.:
#
# send_inferior "hello\n"
# gdb_test_multiple "continue" "test echo" {
#    -i "$inferior_spawn_id" -re "^hello\r\nhello\r\n$" {
#        pass "got echo"
#    }
#    -i "$gdb_spawn_id" -re "Breakpoint.*$gdb_prompt $" {
#        fail "hit breakpoint"
#    }
# }
#
# The standard patterns, such as "Inferior exited..." and "A problem
# ...", all being implicitly appended to that list.  These are always
# expected from $gdb_spawn_id.  IOW, callers do not need to worry
# about resetting "-i" back to $gdb_spawn_id explicitly.
#
proc gdb_test_multiple { command message user_code { prompt_regexp "" } } {
    global verbose use_gdb_stub
    global gdb_prompt pagination_prompt
    global GDB
    global gdb_spawn_id
    global inferior_exited_re
    upvar timeout timeout
    upvar expect_out expect_out
    global any_spawn_id

    if { "$prompt_regexp" == "" } {
        set prompt_regexp "$gdb_prompt $"
    }

    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" || $item == "-i" } {
            set expecting_arg 1
            lappend processed_code $item
            continue
        }
        if { $expecting_arg } {
            set expecting_arg 0
            lappend processed_code $subst_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

    # Reset the spawn id, in case the processed code used -i.
    append code {
        -i "$gdb_spawn_id"
    }

    append code {
        -re "Ending remote debugging.*$prompt_regexp" {
            if ![isnative] then {
                warning "Can`t communicate to remote target."
            }
            gdb_exit
            gdb_start
            set result -1
        }
        -re "Undefined\[a-z\]* command:.*$prompt_regexp" {
            perror "Undefined command \"$command\"."
            fail "$message"
            set result 1
        }
        -re "Ambiguous command.*$prompt_regexp" {
            perror "\"$command\" is not a unique command name."
            fail "$message"
            set result 1
        }
        -re "$inferior_exited_re with code \[0-9\]+.*$prompt_regexp" {
            if ![string match "" $message] then {
                set errmsg "$message (the program exited)"
            } else {
                set errmsg "$command (the program exited)"
            }
            fail "$errmsg"
            set result -1
        }
        -re "$inferior_exited_re normally.*$prompt_regexp" {
            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.*$prompt_regexp" {
            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$prompt_regexp" {
            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" answer
            gdb_expect -re "$prompt_regexp"
            fail "$message (got interactive prompt)"
            set result -1
        }
        -re "\\\[0\\\] cancel\r\n\\\[1\\\] all.*\r\n> $" {
            send_gdb "0\n"
            gdb_expect -re "$prompt_regexp"
            fail "$message (got breakpoint menu)"
            set result -1
        }

        -i $gdb_spawn_id
        eof {
            perror "GDB process no longer exists"
            set wait_status [wait -i $gdb_spawn_id]
            verbose -log "GDB process exited with wait status $wait_status"
            if { $message != "" } {
                fail "$message"
            }
            return -1
        }
    }

    # Now patterns that apply to any spawn id specified.
    append code {
        -i $any_spawn_id
        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
        }
    }

    # remote_expect calls the eof section if there is an error on the
    # expect call.  We already have eof sections above, and we don't
    # want them to get called in that situation.  Since the last eof
    # section becomes the error section, here we define another eof
    # section, but with an empty spawn_id list, so that it won't ever
    # match.
    append code {
        -i "" eof {
            # This comment is here because the eof section must not be
            # the empty string, otherwise remote_expect won't realize
            # it exists.
        }
    }

    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.  This argument
#   may be omitted to just match the prompt, ignoring whatever output 
#   precedes it.
# 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 gdb_prompt
    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 execute, send to GDB with send_gdb.  If
#   this is the null string no command is sent.
# 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
    if { $command != "" } {
        send_gdb "$command\n"
    }
    return [gdb_expect_list $test_name "$gdb_prompt $" $expected_output_list]
}

\f
# 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
        }
    }
}
\f

# 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
            }
        }
    }
}

# gdb_test_stdio COMMAND INFERIOR_PATTERN GDB_PATTERN MESSAGE
# Send a command to gdb; expect inferior and gdb output.
#
# See gdb_test_multiple for a description of the COMMAND and MESSAGE
# parameters.
#
# INFERIOR_PATTERN is the pattern to match against inferior output.
#
# GDB_PATTERN is the pattern to match against gdb output, and must NOT
# include the \r\n sequence immediately before the gdb prompt, nor the
# prompt.  The default is empty.
#
# Both inferior and gdb patterns must match for a PASS.
#
# If MESSAGE is ommitted, then COMMAND will be used as the message.
#
# Returns:
#    1 if the test failed,
#    0 if the test passes,
#   -1 if there was an internal error.
#

proc gdb_test_stdio {command inferior_pattern {gdb_pattern ""} {message ""}} {
    global inferior_spawn_id gdb_spawn_id
    global gdb_prompt

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

    set inferior_matched 0
    set gdb_matched 0

    # Use an indirect spawn id list, and remove the inferior spawn id
    # from the expected output as soon as it matches, in case
    # $inferior_pattern happens to be a prefix of the resulting full
    # gdb pattern below (e.g., "\r\n").
    global gdb_test_stdio_spawn_id_list
    set gdb_test_stdio_spawn_id_list "$inferior_spawn_id"

    # Note that if $inferior_spawn_id and $gdb_spawn_id are different,
    # then we may see gdb's output arriving before the inferior's
    # output.
    set res [gdb_test_multiple $command $message {
        -i gdb_test_stdio_spawn_id_list -re "$inferior_pattern" {
            set inferior_matched 1
            if {!$gdb_matched} {
                set gdb_test_stdio_spawn_id_list ""
                exp_continue
            }
        }
        -i $gdb_spawn_id -re "$gdb_pattern\r\n$gdb_prompt $" {
            set gdb_matched 1
            if {!$inferior_matched} {
                exp_continue
            }
        }
    }]
    if {$res == 0} {
        pass $message
    } else {
        verbose -log "inferior_matched=$inferior_matched, gdb_matched=$gdb_matched"
    }
    return $res
}

# get_print_expr_at_depths EXP OUTPUTS
#
# Used for testing 'set print max-depth'.  Prints the expression EXP
# with 'set print max-depth' set to various depths.  OUTPUTS is a list
# of `n` different patterns to match at each of the depths from 0 to
# (`n` - 1).
#
# This proc does one final check with the max-depth set to 'unlimited'
# which is tested against the last pattern in the OUTPUTS list.  The
# OUTPUTS list is therefore required to match every depth from 0 to a
# depth where the whole of EXP is printed with no ellipsis.
#
# This proc leaves the 'set print max-depth' set to 'unlimited'.
proc gdb_print_expr_at_depths {exp outputs} {
    for { set depth 0 } { $depth <= [llength $outputs] } { incr depth } {
        if { $depth == [llength $outputs] } {
            set expected_result [lindex $outputs [expr [llength $outputs] - 1]]
            set depth_string "unlimited"
        } else {
            set expected_result [lindex $outputs $depth]
            set depth_string $depth
        }

        with_test_prefix "exp='$exp': depth=${depth_string}" {
            gdb_test_no_output "set print max-depth ${depth_string}"
            gdb_test "p $exp" "$expected_result"
        }
    }
}

\f

# 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" answer
            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 inferior_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" answer
                exp_continue
            }
            -re "DOSEXIT code" { }
            default { }
        }
    }

    if ![is_remote host] {
        remote_close host
    }
    unset gdb_spawn_id
    unset inferior_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.  Mark as optional so it doesn't
    # get written to the stdin log.
    send_gdb "kill\n" optional
    gdb_expect 120 {
        -re "Kill the program being debugged. .y or n. $" {
            send_gdb "y\n" answer
            verbose "\t\tKilling previous program being debugged"
            exp_continue
        }
        -re "$gdb_prompt $" {
            # OK.
        }
    }

    send_gdb "file $arg\n"
    gdb_expect 120 {
        -re "Reading symbols from.*LZMA support was disabled.*$gdb_prompt $" {
            verbose "\t\tLoaded $arg into $GDB; .gnu_debugdata found but no LZMA available"
            set gdb_file_cmd_debug_info "lzma"
            return 0
        }
        -re "Reading symbols from.*no debugging symbols found.*$gdb_prompt $" {
            verbose "\t\tLoaded $arg into $GDB with no debugging symbols"
            set gdb_file_cmd_debug_info "nodebug"
            return 0
        }
        -re "Reading symbols from.*$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. $" {
            send_gdb "y\n" answer
            gdb_expect 120 {
                -re "Reading symbols from.*$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 $GDBFLAGS"
    gdb_write_cmd_file "$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
    global gdb_spawn_id
    global inferior_spawn_id

    if [info exists gdb_spawn_id] {
        return 0
    }

    # Keep track of the number of times GDB has been launched.
    global gdb_instances
    incr gdb_instances

    gdb_stdin_log_init

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

    # Default to assuming inferior I/O is done on GDB's terminal.
    if {![info exists inferior_spawn_id]} {
        set inferior_spawn_id $gdb_spawn_id
    }

    # 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.
    gdb_expect 360 {
        -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."
        }
    }

    gdb_debug_init
    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 D.

proc skip_d_tests {} {
    return 0
}

# Return 1 to skip Rust tests, 0 to try them.
proc skip_rust_tests {} {
    return [expr {![isnative]}]
}

# Return a 1 for configurations that do not support Python scripting.
# PROMPT_REGEXP is the expected prompt.

proc skip_python_tests_prompt { prompt_regexp } {
    global gdb_py_is_py3k

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

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

    return 0
}

# Return a 1 for configurations that do not support Python scripting.
# Note: This also sets various globals that specify which version of Python
# is in use.  See skip_python_tests_prompt.

proc skip_python_tests {} {
    global gdb_prompt
    return [skip_python_tests_prompt "$gdb_prompt $"]
}

# 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
}

# Return 1 if we should skip tui related tests.

proc skip_tui_tests {} {
    global gdb_prompt

    gdb_test_multiple "help layout" "verify tui support" {
        -re "Undefined command: \"layout\".*$gdb_prompt $" {
            return 1
        }
        -re "$gdb_prompt $" {
        }
    }

    return 0
}

# 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
  }
}

# Wrapper for foreach that calls with_test_prefix on each iteration,
# including the iterator's name and current value in the prefix.

proc foreach_with_prefix {var list body} {
    upvar 1 $var myvar
    foreach myvar $list {
        with_test_prefix "$var=$myvar" {
            set code [catch {uplevel 1 $body} result]
        }

        if {$code == 1} {
            global errorInfo errorCode
            return -code $code -errorinfo $errorInfo -errorcode $errorCode $result
        } elseif {$code == 3} {
            break
        } elseif {$code == 2} {
            return -code $code $result
        }
    }
}

# Like TCL's native proc, but defines a procedure that wraps its body
# within 'with_test_prefix "$proc_name" { ... }'.
proc proc_with_prefix {name arguments body} {
    # Define the advertised proc.
    proc $name $arguments [list with_test_prefix $name $body]
}


# Run BODY in the context of the caller.  After BODY is run, the variables
# listed in VARS will be reset to the values they had before BODY was run.
#
# This is useful for providing a scope in which it is safe to temporarily
# modify global variables, e.g.
#
#   global INTERNAL_GDBFLAGS
#   global env
#
#   set foo GDBHISTSIZE
#
#   save_vars { INTERNAL_GDBFLAGS env($foo) env(HOME) } {
#       append INTERNAL_GDBFLAGS " -nx"
#       unset -nocomplain env(GDBHISTSIZE)
#       gdb_start
#       gdb_test ...
#   }
#
# Here, although INTERNAL_GDBFLAGS, env(GDBHISTSIZE) and env(HOME) may be
# modified inside BODY, this proc guarantees that the modifications will be
# undone after BODY finishes executing.

proc save_vars { vars body } {
    array set saved_scalars { }
    array set saved_arrays { }
    set unset_vars { }

    foreach var $vars {
        # First evaluate VAR in the context of the caller in case the variable
        # name may be a not-yet-interpolated string like env($foo)
        set var [uplevel 1 list $var]

        if [uplevel 1 [list info exists $var]] {
            if [uplevel 1 [list array exists $var]] {
                set saved_arrays($var) [uplevel 1 [list array get $var]]
            } else {
                set saved_scalars($var) [uplevel 1 [list set $var]]
            }
        } else {
            lappend unset_vars $var
        }
    }

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

    foreach {var value} [array get saved_scalars] {
        uplevel 1 [list set $var $value]
    }

    foreach {var value} [array get saved_arrays] {
        uplevel 1 [list unset $var]
        uplevel 1 [list array set $var $value]
    }

    foreach var $unset_vars {
        uplevel 1 [list unset -nocomplain $var]
    }

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

# Run tests in BODY with the current working directory (CWD) set to
# DIR.  When BODY is finished, restore the original CWD.  Return the
# result of BODY.
#
# This procedure doesn't check if DIR is a valid directory, so you
# have to make sure of that.

proc with_cwd { dir body } {
    set saved_dir [pwd]
    verbose -log "Switching to directory $dir (saved CWD: $saved_dir)."
    cd $dir

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

    verbose -log "Switching back to $saved_dir."
    cd $saved_dir

    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
    }
}

# Switch the default spawn id to SPAWN_ID, so that gdb_test,
# mi_gdb_test etc. default to using it.

proc switch_gdb_spawn_id {spawn_id} {
    global gdb_spawn_id
    global board board_info

    set gdb_spawn_id $spawn_id
    set board [host_info name]
    set board_info($board,fileid) $spawn_id
}

# Clear the default spawn id.

proc clear_gdb_spawn_id {} {
    global gdb_spawn_id
    global board board_info

    unset -nocomplain gdb_spawn_id
    set board [host_info name]
    unset -nocomplain board_info($board,fileid)
}

# Run BODY with SPAWN_ID as current spawn id.

proc with_spawn_id { spawn_id body } {
    global gdb_spawn_id

    if [info exists gdb_spawn_id] {
        set saved_spawn_id $gdb_spawn_id
    }

    switch_gdb_spawn_id $spawn_id

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

    if [info exists saved_spawn_id] {
        switch_gdb_spawn_id $saved_spawn_id
    } else {
        clear_gdb_spawn_id
    }

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

# Select the largest timeout from all the timeouts:
# - the local "timeout" variable of the scope two levels above,
# - the global "timeout" variable,
# - the board variable "gdb,timeout".

proc get_largest_timeout {} {
    upvar #0 timeout gtimeout
    upvar 2 timeout timeout

    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
    }

    return $tmt
}

# Run tests in BODY with timeout increased by factor of FACTOR.  When
# BODY is finished, restore timeout.

proc with_timeout_factor { factor body } {
    global timeout

    set savedtimeout $timeout

    set timeout [expr [get_largest_timeout] * $factor]
    set code [catch {uplevel 1 $body} result]

    set timeout $savedtimeout
    if {$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 {

    if { [gdb_skip_float_test] } {
        # If floating point is not supported, _Complex is not
        # supported.
        return 0
    }

    # Compile a test program containing _Complex types.

    return [gdb_can_simple_compile complex {
        int main() {
            _Complex float cf;
            _Complex double cd;
            _Complex long double cld;
            return 0;
        }
    } executable]
}

# Return 1 if GDB can get a type for siginfo from the target, otherwise
# return 0.

proc supports_get_siginfo_type {} {
    if { [istarget "*-*-linux*"] } {
        return 1
    } else {
        return 0
    }
}

# Return 1 if the target supports hardware single stepping.

proc can_hardware_single_step {} {

    if { [istarget "arm*-*-*"] || [istarget "mips*-*-*"]
         || [istarget "tic6x-*-*"] || [istarget "sparc*-*-linux*"]
         || [istarget "nios2-*-*"] } {
        return 0
    }

    return 1
}

# 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.
    return [can_hardware_single_step]
}

# 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 "aarch64*-*-linux*"]
         || [istarget "powerpc*-*-linux*"]
         || [istarget "s390*-*-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 "aarch64*-*-linux*"]
         || [istarget "powerpc*-*-linux*"]
         || [istarget "s390*-*-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 { int foo () {return 0;} }
    if {![gdb_simple_compile elf_target $src]} {
        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 {
    return [gdb_can_simple_compile is_ilp32_target {
        int dummy[sizeof (int) == 4
                  && sizeof (void *) == 4
                  && sizeof (long) == 4 ? 1 : -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 {
    return [gdb_can_simple_compile is_lp64_target {
        int dummy[sizeof (int) == 4
                  && sizeof (void *) == 8
                  && sizeof (long) == 8 ? 1 : -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 {
    return [gdb_can_simple_compile is_64_target {
        int function(void) { return 3; }
        int dummy[sizeof (&function) == 8 ? 1 : -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
    }

    return [gdb_can_simple_compile is_amd64_regs_target {
        int main (void) {
            asm ("incq %rax");
            asm ("incq %r15");

            return 0;
        }
    }]
}

# 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 this target is an arm or aarch32 on aarch64.

gdb_caching_proc is_aarch32_target {
    if { [istarget "arm*-*-*"] } {
        return 1
    }

    if { ![istarget "aarch64*-*-*"] } {
        return 0
    }

    set list {}
    foreach reg \
        {r0 r1 r2 r3} {
            lappend list "\tmov $reg, $reg"
        }

    return [gdb_can_simple_compile aarch32 [join $list \n]]
}

# Return 1 if this target is an aarch64, either lp64 or ilp32.

proc is_aarch64_target {} {
    if { ![istarget "aarch64*-*-*"] } {
        return 0
    }

    return [expr ![is_aarch32_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*-*-*"]
         || [istarget "aarch64*-*-linux*"] } {
        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.
    if [get_compiler_info] {
       warning "Could not get compiler info"
       return 1
    }
    if [test_compiler_info gcc*] {
        set compile_flags "additional_flags=-maltivec"
    } elseif [test_compiler_info xlc*] {
        set compile_flags "additional_flags=-qaltivec"
    } else {
        verbose "Could not compile with altivec support, returning 1" 2
        return 1
    }

    # Compile a test program containing VMX instructions.
    set src {
        int main() {
            #ifdef __MACH__
            asm volatile ("vor v0,v0,v0");
            #else
            asm volatile ("vor 0,0,0");
            #endif
            return 0;
        }
    }
    if {![gdb_simple_compile $me $src executable $compile_flags]} {
        return 1
    }

    # Compilation succeeded so now run it via gdb.

    gdb_exit
    gdb_start
    gdb_reinitialize_dir $srcdir/$subdir
    gdb_load "$obj"
    gdb_run_cmd
    gdb_expect {
        -re ".*Illegal instruction.*${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 $obj

    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.
    if [get_compiler_info] {
       warning "Could not get compiler info"
       return 1
    }
    if [test_compiler_info gcc*] {
        set compile_flags "additional_flags=-mvsx"
    } elseif [test_compiler_info xlc*] {
        set compile_flags "additional_flags=-qasm=gcc"
    } else {
        verbose "Could not compile with vsx support, returning 1" 2
        return 1
    }

    # Compile a test program containing VSX instructions.
    set 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;
        }
    }
    if {![gdb_simple_compile $me $src executable $compile_flags]} {
        return 1
    }

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

    gdb_exit
    gdb_start
    gdb_reinitialize_dir $srcdir/$subdir
    gdb_load "$obj"
    gdb_run_cmd
    gdb_expect {
        -re ".*Illegal instruction.*${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 $obj

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

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

gdb_caching_proc skip_tsx_tests {
    global srcdir subdir gdb_prompt inferior_exited_re

    set me "skip_tsx_tests"

    # Compile a test program.
    set src {
        int main() {
            asm volatile ("xbegin .L0");
            asm volatile ("xend");
            asm volatile (".L0: nop");
            return 0;
        }
    }
    if {![gdb_simple_compile $me $src executable]} {
        return 1
    }

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

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

    verbose "$me:  returning $skip_tsx_tests" 2
    return $skip_tsx_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
    }

    # Compile a test program.
    set src { int main() { return 0; } }
    if {![gdb_simple_compile $me $src executable]} {
        return 0
    }

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

    gdb_exit
    gdb_start
    gdb_reinitialize_dir $srcdir/$subdir
    gdb_load $obj
    if ![runto_main] {
        return 1
    }
    # In case of an unexpected output, we return 2 as a fail value.
    set skip_btrace_tests 2
    gdb_test_multiple "record btrace" "check btrace support" {
        -re "You can't do that when your target is.*\r\n$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 $obj

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

# Run a test on the target to see if it supports btrace pt 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_pt_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
    }

    # Compile a test program.
    set src { int main() { return 0; } }
    if {![gdb_simple_compile $me $src executable]} {
        return 0
    }

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

    gdb_exit
    gdb_start
    gdb_reinitialize_dir $srcdir/$subdir
    gdb_load $obj
    if ![runto_main] {
        return 1
    }
    # In case of an unexpected output, we return 2 as a fail value.
    set skip_btrace_tests 2
    gdb_test_multiple "record btrace pt" "check btrace pt support" {
        -re "You can't do that when your target is.*\r\n$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 $" {
            set skip_btrace_tests 1
        }
        -re "support was disabled at compile time.*\r\n$gdb_prompt $" {
            set skip_btrace_tests 1
        }
        -re "^record btrace pt\r\n$gdb_prompt $" {
            set skip_btrace_tests 0
        }
    }
    gdb_exit
    remote_file build delete $obj

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

# Run a test on the target to see if it supports Aarch64 SVE hardware.
# Return 0 if so, 1 if it does not.  Note this causes a restart of GDB.

gdb_caching_proc skip_aarch64_sve_tests {
    global srcdir subdir gdb_prompt inferior_exited_re

    set me "skip_aarch64_sve_tests"

    if { ![is_aarch64_target]} {
        return 1
    }

    set compile_flags "{additional_flags=-march=armv8-a+sve}"

    # Compile a test program containing SVE instructions.
    set src {
        int main() {
            asm volatile ("ptrue p0.b");
            return 0;
        }
    }
    if {![gdb_simple_compile $me $src executable $compile_flags]} {
        return 1
    }

    # Compilation succeeded so now run it via gdb.
    clean_restart $obj
    gdb_run_cmd
    gdb_expect {
        -re ".*Illegal instruction.*${gdb_prompt} $" {
            verbose -log "\n$me sve hardware not detected"
            set skip_sve_tests 1
        }
        -re ".*$inferior_exited_re normally.*${gdb_prompt} $" {
            verbose -log "\n$me: sve hardware detected"
            set skip_sve_tests 0
        }
        default {
          warning "\n$me: default case taken"
            set skip_sve_tests 1
        }
    }
    gdb_exit
    remote_file build delete $obj

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


# A helper that compiles a test case to see if __int128 is supported.
proc gdb_int128_helper {lang} {
    return [gdb_can_simple_compile "i128-for-$lang" {
        __int128 x;
        int main() { return 0; }
    } executable $lang]
}

# Return true if the C compiler understands the __int128 type.
gdb_caching_proc has_int128_c {
    return [gdb_int128_helper c]
}

# Return true if the C++ compiler understands the __int128 type.
gdb_caching_proc has_int128_cxx {
    return [gdb_int128_helper c++]
}

# Return true if the IFUNC feature is unsupported.
gdb_caching_proc skip_ifunc_tests {
    if [gdb_can_simple_compile ifunc {
        extern void f_ ();
        typedef void F (void);
        F* g (void) { return &f_; }
        void f () __attribute__ ((ifunc ("g")));
    } object] {
        return 0
    } else {
        return 1
    }
}

# 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*-*-*"]
         || [istarget "aarch64*-*-*"]
         || [istarget "s390*-*-*"] } {
        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 "aarch64*-*-*"]
         || [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.  PROMPT_REGEXP is the expected prompt.

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

# As skip_libstdcxx_probe_tests_prompt, with gdb_prompt.

proc skip_libstdcxx_probe_tests {} {
    global gdb_prompt
    return [skip_libstdcxx_probe_tests_prompt "$gdb_prompt $"]
}

# 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
}

# Helper for gdb_is_target_* procs.  TARGET_NAME is the name of the target
# we're looking for (used to build the test name).  TARGET_STACK_REGEXP
# is a regexp that will match the output of "maint print target-stack" if
# the target in question is currently pushed.  PROMPT_REGEXP is a regexp
# matching the expected prompt after the command output.

proc gdb_is_target_1 { target_name target_stack_regexp prompt_regexp } {
    set test "probe for target ${target_name}"
    gdb_test_multiple "maint print target-stack" $test {
        -re "${target_stack_regexp}${prompt_regexp}" {
            pass $test
            return 1
        }
        -re "$prompt_regexp" {
            pass $test
        }
    } "$prompt_regexp"
    return 0
}

# Helper for gdb_is_target_remote where the expected prompt is variable.

proc gdb_is_target_remote_prompt { prompt_regexp } {
    return [gdb_is_target_1 "remote" ".*emote serial target in gdb-specific protocol.*" $prompt_regexp]
}

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

proc gdb_is_target_remote { } {
    global gdb_prompt

    return [gdb_is_target_remote_prompt "$gdb_prompt $"]
}

# Check whether we're testing with the native target.

proc gdb_is_target_native { } {
    global gdb_prompt

    return [gdb_is_target_1 "native" ".*native \\(Native process\\).*" "$gdb_prompt $"]
}

# Return the effective value of use_gdb_stub.
#
# If the use_gdb_stub global has been set (it is set when the gdb process is
# spawned), return that.  Otherwise, return the value of the use_gdb_stub
# property from the board file.
#
# This is the preferred way of checking use_gdb_stub, since it allows to check
# the value before the gdb has been spawned and it will return the correct value
# even when it was overriden by the test.

proc use_gdb_stub {} {
  global use_gdb_stub

  if [info exists use_gdb_stub] {
     return $use_gdb_stub
  }

  return [target_info exists use_gdb_stub]
}

# 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
}

# N.B. compiler_info is intended to be local to this file.
# Call test_compiler_info with no arguments to fetch its value.
# Yes, this is counterintuitive when there's get_compiler_info,
# but that's the current API.
if [info exists compiler_info] {
    unset compiler_info
}

set gcc_compiled                0

# Figure out what compiler I am using.
# The result is cached so only the first invocation runs the compiler.
#
# 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

    if [info exists compiler_info] {
        # Already computed.
        return 0
    }

    # 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 getting_compiler_info]
        set file [open $ppout r]
        set cppout [read $file]
        close $file
    } else {
        set cppout [ gdb_compile "${ifile}" "" preprocess [list "$arg" quiet getting_compiler_info] ]
    }
    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
        }
    }

    # Set to unknown if for some reason compiler_info didn't get defined.
    if ![info exists compiler_info] {
        verbose -log "get_compiler_info: compiler_info not provided"
        set compiler_info "unknown"
    }
    # Also set to unknown compiler if any diagnostics happened.
    if { $unknown } {
        verbose -log "get_compiler_info: got unexpected diagnostics"
        set compiler_info "unknown"
    }

    # Set the legacy symbols.
    set gcc_compiled 0
    regexp "^gcc-(\[0-9\]+)-" "$compiler_info" matchall gcc_compiled

    # 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 }

    return 0
}

# Return the compiler_info string if no arg is provided.
# Otherwise the argument is a glob-style expression to match against
# compiler_info.

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

    # If no arg, return the compiler_info string.
    if [string match "" $compiler] {
        return $compiler_info
    }

    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]
}

# Determine options that we always want to pass to the compiler.
gdb_caching_proc universal_compile_options {
    set me "universal_compile_options"
    set options {}

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

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

    # Try an option for disabling colored diagnostics.  Some compilers
    # yield colored diagnostics by default (when run from a tty) unless
    # such an option is specified.
    set opt "additional_flags=-fdiagnostics-color=never"
    set lines [target_compile $src $obj object [list "quiet" $opt]]
    if [string match "" $lines] then {
        # Seems to have worked; use the option.
        lappend options $opt
    }
    file delete $src
    file delete $obj

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

# Compile the code in $code to a file based on $name, using the flags
# $compile_flag as well as debug, nowarning and quiet.
# Return 1 if code can be compiled
# Leave the file name of the resulting object in the upvar object.

proc gdb_simple_compile {name code {type object} {compile_flags {}} {object obj}} {
    upvar $object obj

    switch -regexp -- $type {
        "executable" {
            set postfix "x"
        }
        "object" {
            set postfix "o"
        }
        "preprocess" {
            set postfix "i"
        }
        "assembly" {
            set postfix "s"
        }
    }
    set src [standard_temp_file $name-[pid].c]
    set obj [standard_temp_file $name-[pid].$postfix]
    set compile_flags [concat $compile_flags {debug nowarnings quiet}]

    gdb_produce_source $src $code

    verbose "$name:  compiling testfile $src" 2
    set lines [gdb_compile $src $obj $type $compile_flags]

    file delete $src

    if ![string match "" $lines] then {
        verbose "$name:  compilation failed, returning 0" 2
        return 0
    }
    return 1
}

# Compile the code in $code to a file based on $name, using the flags
# $compile_flag as well as debug, nowarning and quiet.
# Return 1 if code can be compiled
# Delete all created files and objects.

proc gdb_can_simple_compile {name code {type object} {compile_flags ""}} {
    set ret [gdb_simple_compile $name $code $type $compile_flags temp_obj]
    file delete $temp_obj
    return $ret
}

# 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 ""

# Compile source files specified by SOURCE into a binary of type TYPE at path
# DEST.  gdb_compile is implemented using DejaGnu's target_compile, so the type
# parameter and most options are passed directly to it.
#
# The type can be one of the following:
#
#   - object: Compile into an object file.
#   - executable: Compile and link into an executable.
#   - preprocess: Preprocess the source files.
#   - assembly: Generate assembly listing.
#
# The following options are understood and processed by gdb_compile:
#
#   - shlib=so_path: Add SO_PATH to the sources, and enable some target-specific
#     quirks to be able to use shared libraries.
#   - shlib_load: Link with appropriate libraries to allow the test to
#     dynamically load libraries at runtime.  For example, on Linux, this adds
#     -ldl so that the test can use dlopen.
#   - nowarnings:  Inhibit all compiler warnings.
#   - pie: Force creation of PIE executables.
#   - nopie: Prevent creation of PIE executables.
#
# And here are some of the not too obscure options understood by DejaGnu that
# influence the compilation:
#
#   - additional_flags=flag: Add FLAG to the compiler flags.
#   - libs=library: Add LIBRARY to the libraries passed to the linker.  The
#     argument can be a file, in which case it's added to the sources, or a
#     linker flag.
#   - ldflags=flag: Add FLAG to the linker flags.
#   - incdir=path: Add PATH to the searched include directories.
#   - libdir=path: Add PATH to the linker searched directories.
#   - ada, c++, f77: Compile the file as Ada, C++ or Fortran.
#   - debug: Build with debug information.
#   - optimize: Build with optimization.

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 {}
    if {[lsearch -exact $options rust] != -1} {
        # -fdiagnostics-color is not a rustcc option.
    } else {
        set new_options [universal_compile_options]
    }
    set shlib_found 0
    set shlib_load 0
    set getting_compiler_info 0
    foreach opt $options {
        if {[regexp {^shlib=(.*)} $opt dummy_var shlib_name]
            && $type == "executable"} {
            if [test_compiler_info "xlc-*"] {
                # IBM xlc compiler doesn't accept shared library named other
                # than .so: use "-Wl," to bypass this
                lappend source "-Wl,$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"
                }
                if { [test_compiler_info "gcc-*"] || [test_compiler_info "clang-*"] } {
                    # Undo debian's change in the default.
                    # Put it at the front to not override any user-provided
                    # value, and to make sure it appears in front of all the
                    # shlibs!
                    lappend new_options "early_flags=-Wl,--no-as-needed"
                }
            }
        } elseif { $opt == "shlib_load" && $type == "executable" } {
            set shlib_load 1
        } elseif { $opt == "getting_compiler_info" } {
            # If this is set, calling test_compiler_info will cause recursion.
            set getting_compiler_info 1
        } else {
            lappend new_options $opt
        }
    }

    # Ensure stack protector is disabled for GCC, as this causes problems with
    # DWARF line numbering.
    # See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88432
    # This option defaults to on for Debian/Ubuntu.
    if { $getting_compiler_info == 0
         && [test_compiler_info {gcc-*-*}]
         && !([test_compiler_info {gcc-[0-3]-*}]
              || [test_compiler_info {gcc-4-0-*}])
         && [lsearch -exact $options rust] == -1} {
        # Put it at the front to not override any user-provided value.
        lappend new_options "early_flags=-fno-stack-protector"
    }

    # Because we link with libraries using their basename, we may need
    # (depending on the platform) to set a special rpath value, to allow
    # the executable to find the libraries it depends on.
    if { $shlib_load || $shlib_found } {
        if { ([istarget "*-*-mingw*"]
              || [istarget *-*-cygwin*]
              || [istarget *-*-pe*]) } {
            # Do not need anything.
        } elseif { [istarget *-*-freebsd*] || [istarget *-*-openbsd*] } {
            lappend new_options "ldflags=-Wl,-rpath,${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]
    }

    # Replace the "pie" option with the appropriate compiler and linker flags
    # to enable PIE executables.
    set pie [lsearch -exact $options pie]
    if {$pie != -1} {
        if [target_info exists gdb,pie_flag] {
            set flag "additional_flags=[target_info gdb,pie_flag]"
        } else {
            # For safety, use fPIE rather than fpie. On AArch64, m68k, PowerPC
            # and SPARC, fpie can cause compile errors due to the GOT exceeding
            # a maximum size.  On other architectures the two flags are
            # identical (see the GCC manual). Note Debian9 and Ubuntu16.10
            # onwards default GCC to using fPIE.  If you do require fpie, then
            # it can be set using the pie_flag.
            set flag "additional_flags=-fPIE"
        }
        set options [lreplace $options $pie $pie $flag]

        if [target_info exists gdb,pie_ldflag] {
            set flag "ldflags=[target_info gdb,pie_ldflag]"
        } else {
            set flag "ldflags=-pie"
        }
        lappend options "$flag"
    }

    # Replace the "nopie" option with the appropriate linker flag to disable
    # PIE executables.  There are no compiler flags for this option.
    set nopie [lsearch -exact $options nopie]
    if {$nopie != -1} {
        if [target_info exists gdb,nopie_flag] {
            set flag "ldflags=[target_info gdb,nopie_flag]"
        } else {
            set flag "ldflags=-no-pie"
        }
        set options [lreplace $options $nopie $nopie $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 { $type == "executable" && $result == "" && $nopie != -1 } {
        if { [exec_is_pie "$dest"] } {
            set result "nopie failed to prevent PIE executable"
        }
    }

    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"
            }
        }
        "icc-*" {
                lappend obj_options "additional_flags=-fpic"
        }
        default {
            # don't know what the compiler is...
        }
    }

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

    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"
        } else {
            # Set the soname of the library.  This causes the linker on ELF
            # systems to create the DT_NEEDED entry in the executable referring
            # to the soname of the library, and not its absolute path.  This
            # (using the absolute path) would be problem when testing on a
            # remote target.
            #
            # In conjunction with setting the soname, we add the special
            # rpath=$ORIGIN value when building the executable, so that it's
            # able to find the library in its own directory.
            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
    }
}

# Send a command to GDB.
# For options for TYPE see gdb_stdin_log_write

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

# Send STRING to the inferior's terminal.

proc send_inferior { string } {
    global inferior_spawn_id

    if {[catch "send -i $inferior_spawn_id -- \$string" errorInfo]} {
        return "$errorInfo"
    } else {
        return ""
    }
}

#
#

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.
    if [info exists atimeout] {
        set tmt $atimeout
    } else {
        set tmt [get_largest_timeout]
    }

    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

    if {$GDBFLAGS != ""} {
        append 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 exp_pid to get the inferior's pid, assuming that gives
    # back the pid of the program.  On remote boards, that would give
    # us instead the PID of e.g., the ssh client, etc.
    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
}

# Kill a progress previously started with spawn_wait_for_attach, and
# reap its wait status.  PROC_SPAWN_ID is the spawn id associated with
# the process.

proc kill_wait_spawned_process { proc_spawn_id } {
    set pid [exp_pid -i $proc_spawn_id]

    verbose -log "killing ${pid}"
    remote_exec build "kill -9 ${pid}"

    verbose -log "closing ${proc_spawn_id}"
    catch "close -i $proc_spawn_id"
    verbose -log "waiting for ${proc_spawn_id}"

    # If somehow GDB ends up still attached to the process here, a
    # blocking wait hangs until gdb is killed (or until gdb / the
    # ptracer reaps the exit status too, but that won't happen because
    # something went wrong.)  Passing -nowait makes expect tell Tcl to
    # wait for the PID in the background.  That's fine because we
    # don't care about the exit status.  */
    wait -nowait -i $proc_spawn_id
}

# Returns the process id corresponding to the given spawn id.

proc spawn_id_get_pid { spawn_id } {
    set testpid [exp_pid -i $spawn_id]

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

    return $testpid
}

# 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 processes spawn IDs,
# one element for each process spawned.  It's a test error to call
# this when [can_spawn_for_attach] is false.

proc spawn_wait_for_attach { executable_list } {
    set spawn_id_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 {
        # Note we use Expect's spawn, not Tcl's exec, because with
        # spawn we control when to wait for/reap the process.  That
        # allows killing the process by PID without being subject to
        # pid-reuse races.
        lappend spawn_id_list [remote_spawn target $executable]
    }

    sleep 2

    return $spawn_id_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 the destination board is remote, the local file FROMFILE is transferred as
# usual with remote_download to TOFILE on the remote board.  The destination
# filename is added to the CLEANFILES global, so it can be cleaned up at the
# end of the test.
#
# If the destination board is local, the destination path TOFILE is passed
# through standard_output_file, and FROMFILE is copied there.
#
# In both cases, if TOFILE is omitted, it defaults to the [file tail] of
# FROMFILE.

proc gdb_remote_download {dest fromfile {tofile {}}} {
    # If TOFILE is not given, default to the same filename as FROMFILE.
    if {[string length $tofile] == 0} {
        set tofile [file tail $fromfile]
    }

    if {[is_remote $dest]} {
        # When the DEST is remote, we simply send the file to DEST.
        global cleanfiles

        set destname [remote_download $dest $fromfile $tofile]
        lappend cleanfiles $destname

        return $destname
    } else {
        # When the DEST is local, we copy the file to the test directory (where
        # the executable is).
        #
        # Note that we pass TOFILE through standard_output_file, regardless of
        # whether it is absolute or relative, because we don't want the tests
        # to be able to write outside their standard output directory.

        set tofile [standard_output_file $tofile]

        file copy -force $fromfile $tofile

        return $tofile
    }
}

# gdb_load_shlib LIB...
#
# Copy the listed library to the target.

proc gdb_load_shlib { file } {
    global gdb_spawn_id

    if ![info exists gdb_spawn_id] {
        perror "gdb_load_shlib: GDB is not running"
    }

    set dest [gdb_remote_download target [shlib_target_file $file]]

    if {[is_remote target]} {
        # If the target is remote, we need to tell gdb where to find the
        # libraries.
        #
        # We could set this even when not testing remotely, but a user
        # generally won't set it unless necessary.  In order to make the tests
        # more like the real-life scenarios, we don't set it for local testing.
        gdb_test "set solib-search-path [file dirname $file]" "" ""
    }

    return $dest
}

#
# 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
    }
}

# Return a path using GDB_PARALLEL.
# ARGS is a list of path elements to append to "$objdir/$GDB_PARALLEL".
# GDB_PARALLEL must be defined, the caller must check.
#
# The default value for GDB_PARALLEL is, canonically, ".".
# The catch is that tests don't expect an additional "./" in file paths so
# omit any directory for the default case.
# GDB_PARALLEL is written as "yes" for the default case in Makefile.in to mark
# its special handling.

proc make_gdb_parallel_path { args } {
    global GDB_PARALLEL objdir
    set joiner [list "file" "join" $objdir]
    if { [info exists GDB_PARALLEL] && $GDB_PARALLEL != "yes" } {
        lappend joiner $GDB_PARALLEL
    }
    set joiner [concat $joiner $args]
    return [eval $joiner]
}

# 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

    set dir [make_gdb_parallel_path outputs $subdir $gdb_test_file_name]
    file mkdir $dir
    return [file join $dir $basename]
}

# Turn BASENAME into a full file name in the standard output directory.  If
# GDB has been launched more than once then append the count, starting with
# a ".1" postfix.

proc standard_output_file_with_gdb_instance {basename} {
    global gdb_instances
    set count [expr $gdb_instances - 1 ]

    if {$count == 0} {
      return [standard_output_file $basename]
    }
    return [standard_output_file ${basename}.${count}]
}

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

proc standard_temp_file {basename} {
    # Since a particular runtest invocation is only executing a single test
    # file at any given time, we can use the runtest pid to build the
    # path of the temp directory.
    set dir [make_gdb_parallel_path temp [pid]]
    file mkdir $dir
    return [file join $dir $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"

    # This disables style output, which would interfere with many
    # tests.
    setenv TERM "dumb"

    # Initialize GDB's pty with a fixed size, to make sure we avoid pagination
    # during startup.  See "man expect" for details about stty_init.
    global stty_init
    set stty_init "rows 25 cols 80"

    # 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

    # Reset GDB number of instances
    global gdb_instances
    set gdb_instances 0

    return [default_gdb_init $test_file_name]
}

proc gdb_finish { } {
    global gdbserver_reconnect_p
    global gdb_prompt
    global cleanfiles

    # 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. $" {
          send_gdb "y\n" answer
          exp_continue
      }
      -re "Starting program.*$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}
    }
  }
}

# Return true if EXECUTABLE contains a .gdb_index or .debug_names index section.

proc exec_has_index_section { executable } {
    set readelf_program [gdb_find_readelf]
    set res [catch {exec $readelf_program -S $executable \
                        | grep -E "\.gdb_index|\.debug_names" }]
    if { $res == 0 } {
        return 1
    }
    return 0
}

# Return true if EXECUTABLE is a Position Independent Executable.

proc exec_is_pie { executable } {
    set readelf_program [gdb_find_readelf]
    set res [catch {exec $readelf_program -d $executable \
                        | grep -E "(FLAGS_1).*Flags:.* PIE($| )" }]
    if { $res == 0 } {
        return 1
    }
    return 0
}

# Return true if a test should be skipped due to lack of floating
# point support or GDB can't fetch the contents from floating point
# registers.

gdb_caching_proc gdb_skip_float_test {
    if [target_info exists gdb,skip_float_tests] {
        return 1
    }

    # There is an ARM kernel ptrace bug that hardware VFP registers
    # are not updated after GDB ptrace set VFP registers.  The bug
    # was introduced by kernel commit 8130b9d7b9d858aa04ce67805e8951e3cb6e9b2f
    # in 2012 and is fixed in e2dfb4b880146bfd4b6aa8e138c0205407cebbaf
    # in May 2016.  In other words, kernels older than 4.6.3, 4.4.14,
    # 4.1.27, 3.18.36, and 3.14.73 have this bug.
    # This kernel bug is detected by check how does GDB change the
    # program result by changing one VFP register.
    if { [istarget "arm*-*-linux*"] } {

        set compile_flags {debug nowarnings }

        # Set up, compile, and execute a test program having VFP
        # operations.
        set src [standard_temp_file arm_vfp[pid].c]
        set exe [standard_temp_file arm_vfp[pid].x]

        gdb_produce_source $src {
            int main() {
                double d = 4.0;
                int ret;

                asm ("vldr d0, [%0]" : : "r" (&d));
                asm ("vldr d1, [%0]" : : "r" (&d));
                asm (".global break_here\n"
                     "break_here:");
                asm ("vcmp.f64 d0, d1\n"
                     "vmrs APSR_nzcv, fpscr\n"
                     "bne L_value_different\n"
                     "movs %0, #0\n"
                     "b L_end\n"
                     "L_value_different:\n"
                     "movs %0, #1\n"
                     "L_end:\n" : "=r" (ret) :);

                /* Return $d0 != $d1.  */
                return ret;
            }
        }

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

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

        # No error message, compilation succeeded so now run it via gdb.
        # Run the test up to 5 times to detect whether ptrace can
        # correctly update VFP registers or not.
        set skip_vfp_test 0
        for {set i 0} {$i < 5} {incr i} {
            global gdb_prompt srcdir subdir

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

            runto_main
            gdb_test "break *break_here"
            gdb_continue_to_breakpoint "break_here"

            # Modify $d0 to a different value, so the exit code should
            # be 1.
            gdb_test "set \$d0 = 5.0"

            set test "continue to exit"
            gdb_test_multiple "continue" "$test" {
                -re "exited with code 01.*$gdb_prompt $" {
                }
                -re "exited normally.*$gdb_prompt $" {
                    # However, the exit code is 0.  That means something
                    # wrong in setting VFP registers.
                    set skip_vfp_test 1
                    break
                }
            }
        }

        gdb_exit
        remote_file build delete $exe

        return $skip_vfp_test
    }
    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_spawn_id
    global gdb_prompt
    global srcdir

    if { [info exists gdb_spawn_id] } {
        error "GDB must not be running in gdb_skip_xml_tests."
    }

    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

    # Compile and execute a test program to check whether argv[0] is available.
    gdb_simple_compile has_argv0 {
        int main (int argc, char **argv) {
            return 0;
        }
    } executable


    # 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
            }
        }

        set old_elements "200"
        set test "show print elements"
        gdb_test_multiple $test $test {
            -re "Limit on string chars or array elements to print is (\[^\r\n\]+)\\.\r\n$gdb_prompt $" {
                set old_elements $expect_out(1,string)
            }
        }
        set old_repeats "200"
        set test "show print repeats"
        gdb_test_multiple $test $test {
            -re "Threshold for repeated print elements is (\[^\r\n\]+)\\.\r\n$gdb_prompt $" {
                set old_repeats $expect_out(1,string)
            }
        }
        gdb_test_no_output "set print elements unlimited" ""
        gdb_test_no_output "set print repeats unlimited" ""

        set retval 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} $" {
                        set retval 1
                    }
                    -re "${gdb_prompt} $" {
                    }
                }
            }
            -re "${gdb_prompt} $" {
            }
        }
        
        gdb_test_no_output "set print elements $old_elements" ""
        gdb_test_no_output "set print repeats $old_repeats" ""

        return $retval
    }

    set result [gdb_has_argv0_1 $obj]

    gdb_exit
    file delete $obj

    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 *-*-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 } {
    if { ([istarget "*-*-mingw*"]
          || [istarget *-*-cygwin*]) } {
        set objdump_program [gdb_find_objdump]
        set result [catch {set data [exec $objdump_program -p $filename | grep signature | cut "-d " -f4]} output]
        verbose "result is $result"
        verbose "output is $output"
        if {$result == 1} {
            return ""
        }
        return $data
    } else {
        set tmp [standard_output_file "${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 TESTNAME 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 {testname {}} } {
    if {$testname == {}} {
        set message $gdb_command
    } else {
        set message $testname
    }
    set expected_output [join $expected_lines ""]
    gdb_test "${gdb_command}" "${expected_output}" $message
}

# A regexp that matches the end of help CLASS|PREFIX_COMMAND
set help_list_trailer {
    "Type \"apropos word\" to search for commands related to \"word\"\.[\r\n]+"
    "Type \"apropos -v word\" for full documentation of commands related to \"word\"\.[\r\n]+"
    "Command name abbreviations are allowed if unambiguous\."
}

# 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.
# LIST_OF_COMMANDS are regular expressions that should match the
# list of commands in that class.  If empty, the command list will be
# matched automatically.  The presence of standard epilogue will be tested
# automatically.
# If last argument TESTNAME is not empty, it's used as the name of the
# test to be printed on pass/fail.
# Notice that the '[' and ']' characters don't need to be escaped for strings
# wrapped in {} braces.
proc test_class_help { command_class expected_initial_lines {list_of_commands {}} {testname {}} } {
    global help_list_trailer
    if {[llength $list_of_commands]>0} {
        set l_list_of_commands {"List of commands:[\r\n]+[\r\n]+"}
        set l_list_of_commands [concat $l_list_of_commands $list_of_commands]
        set l_list_of_commands [concat $l_list_of_commands {"[\r\n]+[\r\n]+"}]
    } else {
        set l_list_of_commands {"List of commands\:.*[\r\n]+"}
    }
    set l_stock_body {
        "Type \"help\" followed by command name for full documentation\.[\r\n]+"
    }
    set l_entire_body [concat $expected_initial_lines $l_list_of_commands \
                       $l_stock_body $help_list_trailer]

    help_test_raw "help ${command_class}" $l_entire_body $testname
}

# Like test_class_help but specialised to test "help user-defined".
proc test_user_defined_class_help { {list_of_commands {}} {testname {}} } {
    test_class_help "user-defined" {
        "User-defined commands\.[\r\n]+"
        "The commands in this class are those defined by the user\.[\r\n]+"
        "Use the \"define\" command to define a command\.[\r\n]+"
    } $list_of_commands $testname
}


# 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 } {
    global help_list_trailer
    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\.\[\r\n\]+"]
    set l_entire_body [concat $expected_initial_lines $l_stock_body $help_list_trailer]
    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]
    } elseif {[lsearch -exact $options rust] != -1} {
        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 [gdb_compile_rust $sources_path "${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 an optional executable into GDB.
# Usage: clean_restart [executable]
# EXECUTABLE is the basename of the binary.

proc clean_restart { args } {
    global srcdir
    global subdir

    if { [llength $args] > 1 } {
        error "bad number of args: [llength $args]"
    }

    gdb_exit
    gdb_start
    gdb_reinitialize_dir $srcdir/$subdir

    if { [llength $args] >= 1 } {
        set executable [lindex $args 0]
        set binfile [standard_output_file ${executable}]
        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
}

# Retrieve the value of EXP in the inferior, represented in format
# specified in FMT (using "printFMT").  DEFAULT is used as fallback if
# print fails.  TEST is the test message to use.  It can be omitted,
# in which case a test message is built from EXP.

proc get_valueof { fmt exp default {test ""} } {
    global gdb_prompt

    if {$test == "" } {
        set test "get valueof \"${exp}\""
    }

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

# Retrieve the value of EXP in the inferior, as a signed decimal value
# (using "print /d").  DEFAULT is used as fallback if print fails.
# TEST is the test message to use.  It can be omitted, in which case
# a test message is built from EXP.

proc get_integer_valueof { exp default {test ""} } {
    global gdb_prompt

    if {$test == ""} {
        set test "get integer valueof \"${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"
        }
        timeout {
            fail "$test (timeout)"
        }
    }
    return ${val}
}

# Retrieve the value of EXP in the inferior, as an hexadecimal value
# (using "print /x").  DEFAULT is used as fallback if print fails.
# TEST is the test message to use.  It can be omitted, in which case
# a test message is built from EXP.

proc get_hexadecimal_valueof { exp default {test ""} } {
    global gdb_prompt

    if {$test == ""} {
        set test "get hexadecimal valueof \"${exp}\""
    }

    set val ${default}
    gdb_test_multiple "print /x ${exp}" $test {
        -re "\\$\[0-9\]* = (0x\[0-9a-zA-Z\]+).*$gdb_prompt $" {
            set val $expect_out(1,string)
            pass "$test"
        }
    }
    return ${val}
}

# Retrieve the size of TYPE in the inferior, as a decimal value.  DEFAULT
# is used as fallback if print fails.  TEST is the test message to use.
# It can be omitted, in which case a test message is 'sizeof (TYPE)'.

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

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 address of VAR.

proc get_var_address { var } {
    global gdb_prompt hex

    # Match output like:
    # $1 = (int *) 0x0
    # $5 = (int (*)()) 0
    # $6 = (int (*)()) 0x24 <function_bar>

    gdb_test_multiple "print &${var}" "get address of ${var}" {
        -re "\\\$\[0-9\]+ = \\(.*\\) (0|$hex)( <${var}>)?\[\r\n\]+${gdb_prompt} $"
        {
            pass "get address of ${var}"
            if { $expect_out(1,string) == "0" } {
                return "0x0"
            } else {
                return $expect_out(1,string)
            }
        }
    }
    return ""
}

# Return the frame number for the currently selected frame
proc get_current_frame_number {{test_name ""}} {
    global gdb_prompt

    if { $test_name == "" } {
        set test_name "get current frame number"
    }
    set frame_num -1
    gdb_test_multiple "frame" $test_name {
        -re "#(\[0-9\]+) .*$gdb_prompt $" {
            set frame_num $expect_out(1,string)
        }
    }
    return $frame_num
}

# 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"
        }
    }
}

# Get the target's current endianness and return it.
proc get_endianness { } {
    global gdb_prompt

    gdb_test_multiple "show endian" "determine endianness" {
        -re ".* (little|big) endian.*\r\n$gdb_prompt $" {
            # Pass silently.
            return $expect_out(1,string)
        }
    }
    return "little"
}

# 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]]
}

# 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 \
            [make_gdb_parallel_path outputs] \
            [make_gdb_parallel_path temp] \
            [make_gdb_parallel_path 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 compiles a test program and then examines
# the output from objdump to determine the prefix (such as underscore)
# for linker symbol prefixes.

gdb_caching_proc gdb_target_symbol_prefix {
    # Compile a simple test program...
    set src { int main() { return 0; } }
    if {![gdb_simple_compile target_symbol_prefix $src executable]} {
        return 0
    }

    set prefix ""

    set objdump_program [gdb_find_objdump]
    set result [catch "exec $objdump_program --syms $obj" output]

    if { $result == 0 \
        && ![regexp -lineanchor \
             { ([^ a-zA-Z0-9]*)main$} $output dummy prefix] } {
        verbose "gdb_target_symbol_prefix: Could not find main in objdump output; returning null prefix" 2
    }

    file delete $obj

    return $prefix
}

# Return 1 if target supports scheduler locking, otherwise return 0.

gdb_caching_proc target_supports_scheduler_locking {
    global gdb_prompt

    set me "gdb_target_supports_scheduler_locking"

    set src { int main() { return 0; } }
    if {![gdb_simple_compile $me $src executable]} {
        return 0
    }

    clean_restart $obj
    if ![runto_main] {
        return 0
    }

    set supports_schedule_locking -1
    set current_schedule_locking_mode ""

    set test "reading current scheduler-locking mode"
    gdb_test_multiple "show scheduler-locking" $test {
        -re "Mode for locking scheduler during execution is \"(\[\^\"\]*)\".*$gdb_prompt" {
            set current_schedule_locking_mode $expect_out(1,string)
        }
        -re "$gdb_prompt $" {
            set supports_schedule_locking 0
        }
        timeout {
            set supports_schedule_locking 0
        }
    }

    if { $supports_schedule_locking == -1 } {
        set test "checking for scheduler-locking support"
        gdb_test_multiple "set scheduler-locking $current_schedule_locking_mode" $test {
            -re "Target '\[^'\]+' cannot support this command\..*$gdb_prompt $" {
                set supports_schedule_locking 0
            }
            -re "$gdb_prompt $" {
                set supports_schedule_locking 1
            }
            timeout {
                set supports_schedule_locking 0
            }
        }
    }

    if { $supports_schedule_locking == -1 } {
        set supports_schedule_locking 0
    }

    gdb_exit
    remote_file build delete $obj
    verbose "$me:  returning $supports_schedule_locking" 2
    return $supports_schedule_locking
}

# gdb_target_symbol returns the provided symbol with the correct prefix
# prepended.  (See gdb_target_symbol_prefix, above.)

proc gdb_target_symbol { symbol } {
  set prefix [gdb_target_symbol_prefix]
  return "${prefix}${symbol}"
}

# gdb_target_symbol_prefix_flags_asm returns a string that can be
# added to gdb_compile options to define the C-preprocessor macro
# SYMBOL_PREFIX with a value that can be prepended to symbols
# for targets which require a prefix, such as underscore.
#
# This version (_asm) defines the prefix without double quotes
# surrounding the prefix.  It is used to define the macro
# SYMBOL_PREFIX for assembly language files.  Another version, below,
# is used for symbols in inline assembler in C/C++ files.
# 
# The lack of quotes in this version (_asm) makes it possible to
# define supporting macros in the .S file.  (The version which
# uses quotes for the prefix won't work for such files since it's
# impossible to define a quote-stripping macro in C.)
#
# It's possible to use this version (_asm) for C/C++ source files too,
# but a string is usually required in such files; providing a version
# (no _asm) which encloses the prefix with double quotes makes it
# somewhat easier to define the supporting macros in the test case.

proc gdb_target_symbol_prefix_flags_asm {} {
    set prefix [gdb_target_symbol_prefix]
    if {$prefix ne ""} {
        return "additional_flags=-DSYMBOL_PREFIX=$prefix"
    } else {
        return "";
    }
}

# gdb_target_symbol_prefix_flags returns the same string as
# gdb_target_symbol_prefix_flags_asm, above, but with the prefix
# enclosed in double quotes if there is a prefix.
#
# See the comment for gdb_target_symbol_prefix_flags_asm for an
# extended discussion.

proc gdb_target_symbol_prefix_flags {} {
    set prefix [gdb_target_symbol_prefix]
    if {$prefix ne ""} {
        return "additional_flags=-DSYMBOL_PREFIX=\"$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 (a regexp);
# 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 "[string_to_regexp ${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"]
}

# Similar to the above, but while multi_line is meant to be used to
# match GDB output, this one is meant to be used to build strings to
# send as GDB input.

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

# Return the version of the DejaGnu framework.
#
# The return value is a list containing the major, minor and patch version
# numbers.  If the version does not contain a minor or patch number, they will
# be set to 0.  For example:
#
#   1.6   -> {1 6 0}
#   1.6.1 -> {1 6 1}
#   2     -> {2 0 0}

proc dejagnu_version { } {
    # The frame_version variable is defined by DejaGnu, in runtest.exp.
    global frame_version

    verbose -log "DejaGnu version: $frame_version"
    verbose -log "Expect version: [exp_version]"
    verbose -log "Tcl version: [info tclversion]"

    set dg_ver [split $frame_version .]

    while { [llength $dg_ver] < 3 } {
        lappend dg_ver 0
    }

    return $dg_ver
}

# Define user-defined command COMMAND using the COMMAND_LIST as the
# command's definition.  The terminating "end" is added automatically.

proc gdb_define_cmd {command command_list} {
    global gdb_prompt

    set input [multi_line_input {*}$command_list "end"]
    set test "define $command"

    gdb_test_multiple "define $command" $test {
        -re "End with"  {
            gdb_test_multiple $input $test {
                -re "\r\n$gdb_prompt " {
                }
            }
        }
    }
}

# Override the 'cd' builtin with a version that ensures that the
# log file keeps pointing at the same file.  We need this because
# unfortunately the path to the log file is recorded using an
# relative path name, and, we sometimes need to close/reopen the log
# after changing the current directory.  See get_compiler_info.

rename cd builtin_cd

proc cd { dir } {

    # Get the existing log file flags.
    set log_file_info [log_file -info]

    # Split the flags into args and file name.
    set log_file_flags ""
    set log_file_file ""
    foreach arg [ split "$log_file_info" " "] {
        if [string match "-*" $arg] {
            lappend log_file_flags $arg
        } else {
            lappend log_file_file $arg
        }
    }

    # If there was an existing file, ensure it is an absolute path, and then
    # reset logging.
    if { $log_file_file != "" } {
        set log_file_file [file normalize $log_file_file]
        log_file
        log_file $log_file_flags "$log_file_file"
    }

    # Call the builtin version of cd.
    builtin_cd $dir
}

# Return a list of all languages supported by GDB, suitable for use in
# 'set language NAME'.  This doesn't include either the 'local' or
# 'auto' keywords.
proc gdb_supported_languages {} {
    return [list c objective-c c++ d go fortran modula-2 asm pascal \
                opencl rust minimal ada]
}

# Check if debugging is enabled for gdb.

proc gdb_debug_enabled { } {
    global gdbdebug

    # If not already read, get the debug setting from environment or board setting.
    if {![info exists gdbdebug]} {
        global env
        if [info exists env(GDB_DEBUG)] {
            set gdbdebug $env(GDB_DEBUG)
        } elseif [target_info exists gdb,debug] {
            set gdbdebug [target_info gdb,debug]
        } else {
            return 0
        }
    }

    # Ensure it not empty.
    return [expr { $gdbdebug != "" }]
}

# Turn on debugging if enabled, or reset if already on.

proc gdb_debug_init { } {

    global gdb_prompt

    if ![gdb_debug_enabled] {
      return;
    }

    # First ensure logging is off.
    send_gdb "set logging off\n"

    set debugfile [standard_output_file gdb.debug]
    send_gdb "set logging file $debugfile\n"

    send_gdb "set logging debugredirect\n"

    global gdbdebug
    foreach entry [split $gdbdebug ,] {
      send_gdb "set debug $entry 1\n"
    }

    # Now that everything is set, enable logging.
    send_gdb "set logging on\n"
    gdb_expect 10 {
        -re "Copying output to $debugfile.*Redirecting debug output to $debugfile.*$gdb_prompt $" {}
        timeout { warning "Couldn't set logging file" }
    }
}

# Check if debugging is enabled for gdbserver.

proc gdbserver_debug_enabled { } {
    # Always disabled for GDB only setups.
    return 0
}

# Open the file for logging gdb input

proc gdb_stdin_log_init { } {
    global in_file

    if {[info exists in_file]} {
      # Close existing file.
      catch "close $in_file"
    }

    set logfile [standard_output_file_with_gdb_instance gdb.in]
    set in_file [open $logfile w]
}

# Write to the file for logging gdb input.
# TYPE can be one of the following:
# "standard" : Default. Standard message written to the log
# "answer" : Answer to a question (eg "Y"). Not written the log.
# "optional" : Optional message. Not written to the log.

proc gdb_stdin_log_write { message {type standard} } {

    global in_file
    if {![info exists in_file]} {
      return
    }

    # Check message types.
    switch -regexp -- $type {
        "answer" {
            return
        }
        "optional" {
            return
        }
    }

    #Write to the log
    puts -nonewline $in_file "$message"
}

# Write the command line used to invocate gdb to the cmd file.

proc gdb_write_cmd_file { cmdline } {
    set logfile [standard_output_file_with_gdb_instance gdb.cmd]
    set cmd_file [open $logfile w]
    puts $cmd_file $cmdline
    catch "close $cmd_file"
}

# Always load compatibility stuff.
load_lib future.exp