gas/testsuite/lib/gas-defs.exp

   1 # Copyright (C) 1993, 1994, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   2 # 2004, 2005 Free Software Foundation, Inc.
   3
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 2 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program; if not, write to the Free Software
  16 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17
  18 # Please email any bugs, comments, and/or additions to this file to:
  19 # dejagnu@gnu.org
  20
  21 # This file was written by Ken Raeburn (raeburn@cygnus.com).
  22
  23 proc gas_version {} {
  24     global AS
  25     catch "exec $AS -version < /dev/null" tmp
  26     # Should find a way to discard constant parts, keep whatever's
  27     # left, so the version string could be almost anything at all...
  28     regexp "\[^\n\]* (cygnus-|)(\[-0-9.a-zA-Z-\]+)\[\r\n\].*" $tmp version cyg number
  29     if ![info exists number] then {
  30         return "[which $AS] (no version number)\n"
  31     }
  32     clone_output "[which $AS] $number\n"
  33     unset version
  34 }
  35
  36 proc gas_run { prog as_opts redir } {
  37     global AS
  38     global ASFLAGS
  39     global comp_output
  40     global srcdir
  41     global subdir
  42     global host_triplet
  43
  44     verbose -log "Executing $srcdir/lib/run $AS $ASFLAGS $as_opts $srcdir/$subdir/$prog $redir"
  45     catch "exec $srcdir/lib/run $AS $ASFLAGS $as_opts $srcdir/$subdir/$prog $redir" comp_output
  46     set comp_output [prune_warnings $comp_output]
  47     verbose "output was $comp_output"
  48     return [list $comp_output ""]
  49 }
  50
  51 proc all_ones { args } {
  52     foreach x $args { if [expr $x!=1] { return 0 } }
  53     return 1
  54 }
  55
  56 proc gas_start { prog as_opts } {
  57     global AS
  58     global ASFLAGS
  59     global srcdir
  60     global subdir
  61     global spawn_id
  62
  63     verbose -log "Starting $AS $ASFLAGS $as_opts $prog" 2
  64     catch {
  65         spawn -noecho -nottycopy $srcdir/lib/run $AS $ASFLAGS $as_opts $srcdir/$subdir/$prog
  66     } foo
  67     if ![regexp {^[0-9]+} $foo] then {
  68         perror "Can't run $subdir/$prog: $foo"
  69     }
  70 }
  71
  72 proc gas_finish { } {
  73     global spawn_id
  74
  75     catch "close"
  76     catch "wait"
  77 }
  78
  79 proc want_no_output { testname } {
  80     global comp_output
  81
  82     if ![string match "" $comp_output] then {
  83         send_log "$comp_output\n"
  84         verbose "$comp_output" 3
  85     }
  86     if [string match "" $comp_output] then {
  87         pass "$testname"
  88         return 1
  89     } else {
  90         fail "$testname"
  91         return 0
  92     }
  93 }
  94
  95 proc gas_test_old { file as_opts testname } {
  96     gas_run $file $as_opts ""
  97     return [want_no_output $testname]
  98 }
  99
 100 proc gas_test { file as_opts var_opts testname } {
 101     global comp_output
 102
 103     set i 0
 104     foreach word $var_opts {
 105         set ignore_stdout($i) [string match "*>" $word]
 106         set opt($i) [string trim $word {>}]
 107         incr i
 108     }
 109     set max [expr 1<<$i]
 110     for {set i 0} {[expr $i<$max]} {incr i} {
 111         set maybe_ignore_stdout ""
 112         set extra_opts ""
 113         for {set bit 0} {(1<<$bit)<$max} {incr bit} {
 114             set num [expr 1<<$bit]
 115             if [expr $i&$num] then {
 116                 set extra_opts "$extra_opts $opt($bit)"
 117                 if $ignore_stdout($bit) then {
 118                     set maybe_ignore_stdout ">/dev/null"
 119                 }
 120             }
 121         }
 122         set extra_opts [string trim $extra_opts]
 123         gas_run $file "$as_opts $extra_opts" $maybe_ignore_stdout
 124
 125         # Should I be able to use a conditional expression here?
 126         if [string match "" $extra_opts] then {
 127             want_no_output $testname
 128         } else {
 129             want_no_output "$testname ($extra_opts)"
 130         }
 131     }
 132     if [info exists errorInfo] then {
 133         unset errorInfo
 134     }
 135 }
 136
 137 proc gas_test_ignore_stdout { file as_opts testname } {
 138     global comp_output
 139
 140     gas_run $file $as_opts ">/dev/null"
 141     want_no_output $testname
 142 }
 143
 144 proc gas_test_error { file as_opts testname } {
 145     global comp_output
 146
 147     gas_run $file $as_opts ">/dev/null"
 148     if ![string match "" $comp_output] then {
 149         send_log "$comp_output\n"
 150         verbose "$comp_output" 3
 151     }
 152     if [string match "" $comp_output] then {
 153         fail "$testname"
 154     } else {
 155         pass "$testname"
 156     }
 157 }
 158
 159 proc gas_exit {} {}
 160
 161 proc gas_init { args } {
 162     global target_cpu
 163     global target_cpu_family
 164     global target_family
 165     global target_vendor
 166     global target_os
 167     global stdoptlist
 168
 169     case "$target_cpu" in {
 170         "m68???"                { set target_cpu_family m68k }
 171         "i[3-7]86"              { set target_cpu_family i386 }
 172         default                 { set target_cpu_family $target_cpu }
 173     }
 174
 175     set target_family "$target_cpu_family-$target_vendor-$target_os"
 176     set stdoptlist "-a>"
 177
 178     if ![istarget "*-*-*"] {
 179         perror "Target name [istarget] is not a triple."
 180     }
 181     # Need to return an empty string.
 182     return
 183 }
 184
 185 #
 186 # is_elf_format
 187 #       true if the object format is known to be ELF
 188 #
 189 proc is_elf_format {} {
 190     if { ![istarget *-*-sysv4*] \
 191          && ![istarget *-*-unixware*] \
 192          && ![istarget *-*-elf*] \
 193          && ![istarget *-*-eabi*] \
 194          && ![istarget hppa*64*-*-hpux*] \
 195          && ![istarget *-*-linux*] \
 196          && ![istarget frv-*-uclinux*] \
 197          && ![istarget *-*-irix5*] \
 198          && ![istarget *-*-irix6*] \
 199          && ![istarget *-*-netbsd*] \
 200          && ![istarget *-*-openbsd*] \
 201          && ![istarget *-*-solaris2*] } {
 202         return 0
 203     }
 204
 205     if { [istarget *-*-linux*aout*] \
 206          || [istarget *-*-linux*oldld*] } {
 207         return 0
 208     }
 209
 210     if { ![istarget *-*-netbsdelf*] \
 211          && ([istarget *-*-netbsd*aout*] \
 212              || [istarget *-*-netbsdpe*] \
 213              || [istarget arm*-*-netbsd*] \
 214              || [istarget sparc-*-netbsd*] \
 215              || [istarget i*86-*-netbsd*] \
 216              || [istarget m68*-*-netbsd*] \
 217              || [istarget vax-*-netbsd*] \
 218              || [istarget ns32k-*-netbsd*]) } {
 219         return 0
 220     }
 221
 222     if { [istarget arm-*-openbsd*] \
 223          || [istarget i386-*-openbsd\[0-2\].*] \
 224          || [istarget i386-*-openbsd3.\[0-3\]] \
 225          || [istarget m68*-*-openbsd*] \
 226          || [istarget ns32k-*-openbsd*] \
 227          || [istarget sparc-*-openbsd\[0-2\].*] \
 228          || [istarget sparc-*-openbsd3.\[0-1\]] \
 229          || [istarget vax-*-openbsd*] } {
 230         return 0
 231     }
 232
 233     return 1
 234 }
 235
 236
 237 # run_dump_test FILE (optional:) EXTRA_OPTIONS
 238 #
 239 # Assemble a .s file, then run some utility on it and check the output.
 240 #
 241 # There should be an assembly language file named FILE.s in the test
 242 # suite directory, and a pattern file called FILE.d.  `run_dump_test'
 243 # will assemble FILE.s, run some tool like `objdump', `objcopy', or
 244 # `nm' on the .o file to produce textual output, and then analyze that
 245 # with regexps.  The FILE.d file specifies what program to run, and
 246 # what to expect in its output.
 247 #
 248 # The FILE.d file begins with zero or more option lines, which specify
 249 # flags to pass to the assembler, the program to run to dump the
 250 # assembler's output, and the options it wants.  The option lines have
 251 # the syntax:
 252 #
 253 #         # OPTION: VALUE
 254 #
 255 # OPTION is the name of some option, like "name" or "objdump", and
 256 # VALUE is OPTION's value.  The valid options are described below.
 257 # Whitespace is ignored everywhere, except within VALUE.  The option
 258 # list ends with the first line that doesn't match the above syntax
 259 # (hmm, not great for error detection).
 260 #
 261 # The optional EXTRA_OPTIONS argument to `run_dump_test' is a list of
 262 # two-element lists.  The first element of each is an option name, and
 263 # the second additional arguments to be added on to the end of the
 264 # option list as given in FILE.d.  (If omitted, no additional options
 265 # are added.)
 266 #
 267 # The interesting options are:
 268 #
 269 #   name: TEST-NAME
 270 #       The name of this test, passed to DejaGNU's `pass' and `fail'
 271 #       commands.  If omitted, this defaults to FILE, the root of the
 272 #       .s and .d files' names.
 273 #
 274 #   as: FLAGS
 275 #       When assembling FILE.s, pass FLAGS to the assembler.
 276 #
 277 #   PROG: PROGRAM-NAME
 278 #       The name of the program to run to analyze the .o file produced
 279 #       by the assembler.  This can be omitted; run_dump_test will guess
 280 #       which program to run by seeing which of the flags options below
 281 #       is present.
 282 #
 283 #   objdump: FLAGS
 284 #   nm: FLAGS
 285 #   objcopy: FLAGS
 286 #       Use the specified program to analyze the .o file, and pass it
 287 #       FLAGS, in addition to the .o file name.  Note that they are run
 288 #       with LC_ALL=C in the environment to give consistent sorting
 289 #       of symbols.
 290 #
 291 #   source: SOURCE
 292 #       Assemble the file SOURCE.s.  If omitted, this defaults to FILE.s.
 293 #       This is useful if several .d files want to share a .s file.
 294 #
 295 #   error: REGEX
 296 #       An error with message matching REGEX must be emitted for the test
 297 #       to pass.  The PROG, objdump, nm and objcopy options have no
 298 #       meaning and need not supplied if this is present.
 299 #
 300 #   warning: REGEX
 301 #       Expect a gas warning matching REGEX.  It is an error to issue
 302 #       both "error" and "warning".
 303 #
 304 # Each option may occur at most once.
 305 #
 306 # After the option lines come regexp lines.  `run_dump_test' calls
 307 # `regexp_diff' to compare the output of the dumping tool against the
 308 # regexps in FILE.d.  `regexp_diff' is defined later in this file; see
 309 # further comments there.
 310
 311 proc run_dump_test { name {extra_options {}} } {
 312     global subdir srcdir
 313     global OBJDUMP NM AS OBJCOPY READELF
 314     global OBJDUMPFLAGS NMFLAGS ASFLAGS OBJCOPYFLAGS READELFFLAGS
 315     global host_triplet
 316     global env
 317
 318     if [string match "*/*" $name] {
 319         set file $name
 320         set name [file tail $name]
 321     } else {
 322         set file "$srcdir/$subdir/$name"
 323     }
 324     set opt_array [slurp_options "${file}.d"]
 325     if { $opt_array == -1 } {
 326         perror "error reading options from $file.d"
 327         unresolved $subdir/$name
 328         return
 329     }
 330     set opts(as) {}
 331     set opts(objdump) {}
 332     set opts(nm) {}
 333     set opts(objcopy) {}
 334     set opts(readelf) {}
 335     set opts(name) {}
 336     set opts(PROG) {}
 337     set opts(source) {}
 338     set opts(stderr) {}
 339     set opts(error) {}
 340     set opts(warning) {}
 341
 342     foreach i $opt_array {
 343         set opt_name [lindex $i 0]
 344         set opt_val [lindex $i 1]
 345         if ![info exists opts($opt_name)] {
 346             perror "unknown option $opt_name in file $file.d"
 347             unresolved $subdir/$name
 348             return
 349         }
 350         if [string length $opts($opt_name)] {
 351             perror "option $opt_name multiply set in $file.d"
 352             unresolved $subdir/$name
 353             return
 354         }
 355         set opts($opt_name) $opt_val
 356     }
 357
 358     foreach i $extra_options {
 359         set opt_name [lindex $i 0]
 360         set opt_val [lindex $i 1]
 361         if ![info exists opts($opt_name)] {
 362             perror "unknown option $opt_name given in extra_opts"
 363             unresolved $subdir/$name
 364             return
 365         }
 366         # add extra option to end of existing option, adding space
 367         # if necessary.
 368         if [string length $opts($opt_name)] {
 369             append opts($opt_name) " "
 370         }
 371         append opts($opt_name) $opt_val
 372     }
 373
 374     if { (($opts(warning) != "") && ($opts(error) != "")) \
 375          || (($opts(warning) != "") && ($opts(stderr) != "")) } {
 376         perror "$testname: bad mix of stderr, error and warning test-directives"
 377         return
 378     }
 379
 380     set program ""
 381     # It's meaningless to require an output-testing method when we
 382     # expect an error.
 383     if { $opts(error) == "" } {
 384         if {$opts(PROG) != ""} {
 385             switch -- $opts(PROG) {
 386                 objdump { set program objdump }
 387                 nm      { set program nm }
 388                 objcopy { set program objcopy }
 389                 readelf { set program readelf }
 390                 default {
 391                     perror "unrecognized program option $opts(PROG) in $file.d"
 392                     unresolved $subdir/$name
 393                     return }
 394             }
 395         } else {
 396             # Guess which program to run, by seeing which option was specified.
 397             foreach p {objdump objcopy nm readelf} {
 398                 if {$opts($p) != ""} {
 399                     if {$program != ""} {
 400                         perror "ambiguous dump program in $file.d"
 401                         unresolved $subdir/$name
 402                         return
 403                     } else {
 404                         set program $p
 405                     }
 406                 }
 407             }
 408         }
 409         if { $program == "" && $opts(warning) == "" } {
 410             perror "dump program unspecified in $file.d"
 411             unresolved $subdir/$name
 412             return
 413         }
 414     }
 415
 416     if { $opts(name) == "" } {
 417         set testname "$subdir/$name"
 418     } else {
 419         set testname $opts(name)
 420     }
 421
 422     if { $opts(source) == "" } {
 423         set sourcefile ${file}.s
 424     } else {
 425         set sourcefile $srcdir/$subdir/$opts(source)
 426     }
 427
 428     set cmd "$srcdir/lib/run $AS $ASFLAGS $opts(as) -o dump.o $sourcefile"
 429     send_log "$cmd\n"
 430     set cmdret [catch "exec $cmd" comp_output]
 431     set comp_output [prune_warnings $comp_output]
 432
 433     set expmsg $opts(error)
 434     if { $opts(warning) != "" } {
 435         set expmsg $opts(warning)
 436     }
 437     if { $cmdret != 0 || $comp_output != "" || $expmsg != "" } then {
 438         # If the executed program writes to stderr and stderr is not
 439         # redirected, exec *always* returns failure, regardless of the
 440         # program exit code.  Thankfully, we can retrieve the true
 441         # return status from a special variable.  Redirection would
 442         # cause a tcl-specific message to be appended, and we'd rather
 443         # not deal with that if we can help it.
 444         global errorCode
 445         if { $cmdret != 0 && [lindex $errorCode 0] == "NONE" } {
 446             set cmdret 0
 447         }
 448
 449         set exitstat "succeeded"
 450         if { $cmdret != 0 } { set exitstat "failed" }
 451
 452         if { $opts(stderr) == "" }  then {
 453             send_log "$comp_output\n"
 454             verbose "$comp_output" 3
 455
 456             if { [regexp $expmsg $comp_output] \
 457                     && (($cmdret == 0) == ($opts(warning) != "")) } {
 458                 # We have the expected output from gas.
 459                 # Return if there's nothing more to do.
 460                 if { $opts(error) != "" || $program == "" } {
 461                     pass $testname
 462                     return
 463                 }
 464             } else {
 465                 verbose -log "$exitstat with: <$comp_output>, expected: <$expmsg>"
 466
 467                 fail $testname
 468                 return
 469             }
 470         } else {
 471             catch {write_file dump.stderr "$comp_output"} write_output
 472             if ![string match "" $write_output] then {
 473                 send_log "error writing dump.stderr: $write_output\n"
 474                 verbose "error writing dump.stderr: $write_output" 3
 475                 send_log "$comp_output\n"
 476                 verbose "$comp_output" 3
 477                 fail $testname
 478                 return
 479             }
 480             set stderrfile $srcdir/$subdir/$opts(stderr)
 481             send_log "wrote pruned stderr to dump.stderr\n"
 482             verbose "wrote pruned stderr to dump.stderr" 3
 483             if { [regexp_diff "dump.stderr" "$stderrfile"] } then {
 484                 if { $opts(error) != "" } {
 485                     verbose -log "$exitstat with: <$comp_output>, expected: <$opts(error)>"
 486                     if [regexp $opts(error) $comp_output] {
 487                         pass $testname
 488                         return
 489                     }
 490                 }
 491                 fail $testname
 492                 verbose "pruned stderr is [file_contents "dump.stderr"]" 2
 493                 return
 494             }
 495         }
 496     }
 497
 498     if { $program == "" } {
 499         return
 500     }
 501     set progopts1 $opts($program)
 502     eval set progopts \$[string toupper $program]FLAGS
 503     eval set binary \$[string toupper $program]
 504
 505     if { [which $binary] == 0 } {
 506         untested $testname
 507         return
 508     }
 509
 510     if { $progopts1 == "" } { set $progopts1 "-r" }
 511     verbose "running $binary $progopts $progopts1" 3
 512
 513     # Objcopy, unlike the other two, won't send its output to stdout,
 514     # so we have to run it specially.
 515     set cmd "$binary $progopts $progopts1 dump.o > dump.out"
 516     if { $program == "objcopy" } {
 517         set cmd "$binary $progopts $progopts1 dump.o dump.out"
 518     }
 519
 520     # Ensure consistent sorting of symbols
 521     if {[info exists env(LC_ALL)]} {
 522         set old_lc_all $env(LC_ALL)
 523     }
 524     set env(LC_ALL) "C"
 525     send_log "$cmd\n"
 526     catch "exec $cmd" comp_output
 527     if {[info exists old_lc_all]} {
 528         set env(LC_ALL) $old_lc_all
 529     } else {
 530         unset env(LC_ALL)
 531     }
 532     set comp_output [prune_warnings $comp_output]
 533     if ![string match "" $comp_output] then {
 534         send_log "$comp_output\n"
 535         fail $testname
 536         return
 537     }
 538
 539     verbose_eval {[file_contents "dump.out"]} 3
 540     if { [regexp_diff "dump.out" "${file}.d"] } then {
 541         fail $testname
 542         verbose "output is [file_contents "dump.out"]" 2
 543         return
 544     }
 545
 546     pass $testname
 547 }
 548
 549 proc slurp_options { file } {
 550     if [catch { set f [open $file r] } x] {
 551         #perror "couldn't open `$file': $x"
 552         perror "$x"
 553         return -1
 554     }
 555     set opt_array {}
 556     # whitespace expression
 557     set ws  {[  ]*}
 558     set nws {[^         ]*}
 559     # whitespace is ignored anywhere except within the options list;
 560     # option names are alphabetic only
 561     set pat "^#${ws}(\[a-zA-Z\]*)$ws:${ws}(.*)$ws\$"
 562     while { [gets $f line] != -1 } {
 563         set line [string trim $line]
 564         # Whitespace here is space-tab.
 565         if [regexp $pat $line xxx opt_name opt_val] {
 566             # match!
 567             lappend opt_array [list $opt_name $opt_val]
 568         } else {
 569             break
 570         }
 571     }
 572     close $f
 573     return $opt_array
 574 }
 575
 576 proc objdump { opts } {
 577     global OBJDUMP
 578     global comp_output
 579     global host_triplet
 580
 581     catch "exec $OBJDUMP $opts" comp_output
 582     set comp_output [prune_warnings $comp_output]
 583     verbose "objdump output=$comp_output\n" 3
 584 }
 585
 586 proc objdump_start_no_subdir { prog opts } {
 587     global OBJDUMP
 588     global srcdir
 589     global spawn_id
 590
 591     verbose "Starting $OBJDUMP $opts $prog" 2
 592     catch {
 593         spawn -noecho -nottyinit $srcdir/lib/run $OBJDUMP $opts $prog
 594     } foo
 595     if ![regexp {^[0-9]+} $foo] then {
 596         perror "Can't run $prog: $foo"
 597     }
 598 }
 599
 600 proc objdump_finish { } {
 601     global spawn_id
 602
 603     catch "close"
 604     catch "wait"
 605 }
 606
 607 # Default timeout is 10 seconds, loses on a slow machine.  But some
 608 # configurations of dejagnu may override it.
 609 if {$timeout<120} then { set timeout 120 }
 610
 611 expect_after -i {
 612     timeout                     { perror "timeout" }
 613     "virtual memory exhausted"  { perror "virtual memory exhausted" }
 614     buffer_full                 { perror "buffer full" }
 615     eof                         { perror "eof" }
 616 }
 617
 618 # regexp_diff, based on simple_diff taken from ld test suite
 619 #       compares two files line-by-line
 620 #       file1 contains strings, file2 contains regexps and #-comments
 621 #       blank lines are ignored in either file
 622 #       returns non-zero if differences exist
 623 #
 624 proc regexp_diff { file_1 file_2 } {
 625
 626     set eof -1
 627     set end_1 0
 628     set end_2 0
 629     set differences 0
 630     set diff_pass 0
 631
 632     if [file exists $file_1] then {
 633         set file_a [open $file_1 r]
 634     } else {
 635         perror "$file_1 doesn't exist"
 636         return 1
 637     }
 638
 639     if [file exists $file_2] then {
 640         set file_b [open $file_2 r]
 641     } else {
 642         perror "$file_2 doesn't exist"
 643         close $file_a
 644         return 1
 645     }
 646
 647     verbose " Regexp-diff'ing: $file_1 $file_2" 2
 648
 649     while { 1 } {
 650         set line_a ""
 651         set line_b ""
 652         while { [string length $line_a] == 0 } {
 653             if { [gets $file_a line_a] == $eof } {
 654                 set end_1 1
 655                 break
 656             }
 657         }
 658         while { [string length $line_b] == 0 || [string match "#*" $line_b] } {
 659             if [ string match "#pass" $line_b ] {
 660                 set end_2 1
 661                 set diff_pass 1
 662                 break
 663             } elseif [ string match "#..." $line_b ] {
 664                 if { [gets $file_b line_b] == $eof } {
 665                     set end_2 1
 666                     break
 667                 }
 668                 verbose "looking for \"^$line_b$\"" 3
 669                 while { ![regexp "^$line_b$" "$line_a"] } {
 670                     verbose "skipping    \"$line_a\"" 3
 671                     if { [gets $file_a line_a] == $eof } {
 672                         set end_1 1
 673                         break
 674                     }
 675                 }
 676                 break
 677             }
 678             if { [gets $file_b line_b] == $eof } {
 679                 set end_2 1
 680                 break
 681             }
 682         }
 683
 684         if { $diff_pass } {
 685             break
 686         } elseif { $end_1 && $end_2 } {
 687             break
 688         } elseif { $end_1 } {
 689             send_log "extra regexps in $file_2 starting with \"^$line_b$\"\nEOF from $file_1\n"
 690             verbose "extra regexps in $file_2 starting with \"^$line_b$\"\nEOF from $file_1" 3
 691             set differences 1
 692             break
 693         } elseif { $end_2 } {
 694             send_log "extra lines in $file_1 starting with \"^$line_a$\"\nEOF from $file_2\n"
 695             verbose "extra lines in $file_1 starting with \"^$line_a$\"\nEOF from $file_2\n" 3
 696             set differences 1
 697             break
 698         } else {
 699             verbose "regexp \"^$line_b$\"\nline   \"$line_a\"" 3
 700             if ![regexp "^$line_b$" "$line_a"] {
 701                 send_log "regexp_diff match failure\n"
 702                 send_log "regexp \"^$line_b$\"\nline   \"$line_a\"\n"
 703                 verbose "regexp_diff match failure\n" 3
 704                 set differences 1
 705             }
 706         }
 707     }
 708
 709     if { $differences == 0 && !$diff_pass && [eof $file_a] != [eof $file_b] } {
 710         send_log "$file_1 and $file_2 are different lengths\n"
 711         verbose "$file_1 and $file_2 are different lengths" 3
 712         set differences 1
 713     }
 714
 715     close $file_a
 716     close $file_b
 717
 718     return $differences
 719 }
 720
 721 proc file_contents { filename } {
 722     set file [open $filename r]
 723     set contents [read $file]
 724     close $file
 725     return $contents
 726 }
 727
 728 proc write_file { filename contents } {
 729     set file [open $filename w]
 730     puts $file "$contents"
 731     close $file
 732 }
 733
 734 proc verbose_eval { expr { level 1 } } {
 735     global verbose
 736     if $verbose>$level then { eval verbose "$expr" $level }
 737 }
 738
 739 # This definition is taken from an unreleased version of DejaGnu.  Once
 740 # that version gets released, and has been out in the world for a few
 741 # months at least, it may be safe to delete this copy.
 742 if ![string length [info proc prune_warnings]] {
 743     #
 744     # prune_warnings -- delete various system verbosities from TEXT.
 745     #
 746     # An example is:
 747     # ld.so: warning: /usr/lib/libc.so.1.8.1 has older revision than expected 9
 748     #
 749     # Sites with particular verbose os's may wish to override this in site.exp.
 750     #
 751     proc prune_warnings { text } {
 752         # This is from sun4's.  Do it for all machines for now.
 753         # The "\\1" is to try to preserve a "\n" but only if necessary.
 754         regsub -all "(^|\n)(ld.so: warning:\[^\n\]*\n?)+" $text "\\1" text
 755
 756         # It might be tempting to get carried away and delete blank lines, etc.
 757         # Just delete *exactly* what we're ask to, and that's it.
 758         return $text
 759     }
 760 }