gdb/testsuite/gdb.base/watchpoint.exp

   1 # Copyright (C) 1992, 1994 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 2 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program; if not, write to the Free Software
  15 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  16
  17 # Please email any bugs, comments, and/or additions to this file to:
  18 # bug-gdb@prep.ai.mit.edu
  19
  20 # This file was written by Fred Fish. (fnf@cygnus.com)
  21
  22 if $tracelevel then {
  23     strace $tracelevel
  24 }
  25
  26 set prms_id 0
  27 set bug_id 0
  28
  29 set testfile "watchpoint"
  30 set srcfile ${testfile}.c
  31 set binfile ${objdir}/${subdir}/${testfile}
  32 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  33     perror "Couldn't compile ${srcfile}"
  34     return -1
  35 }
  36
  37 # Prepare for watchpoint tests by setting up two breakpoints and one
  38 # watchpoint.
  39 #
  40 # We use breakpoints at marker functions to get past all the startup code,
  41 # so we can get to the watchpoints in a reasonable amount of time from a
  42 # known starting point.
  43 #
  44 # For simplicity, so we always know how to reference specific breakpoints or
  45 # watchpoints by number, we expect a particular ordering and numbering of
  46 # each in the combined breakpoint/watchpoint table, as follows:
  47 #
  48 #       Number          What            Where
  49 #       1               Breakpoint      marker1()
  50 #       2               Breakpoint      marker2()
  51 #       3               Watchpoint      ival3
  52
  53 proc initialize {} {
  54     global gdb_prompt
  55     global hex
  56     global decimal
  57     global srcfile
  58
  59     if [gdb_test "break marker1" "Breakpoint 1 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker1" ] {
  60       return 0;
  61     }
  62
  63
  64     if [gdb_test "break marker2" "Breakpoint 2 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker2" ] {
  65       return 0;
  66     }
  67
  68
  69     if [gdb_test "info break" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*" "info break in watchpoint.exp" ] {
  70       return 0;
  71     }
  72
  73
  74     if [gdb_test "watch ival3" ".*\[Ww\]atchpoint 3: ival3" "set watchpoint on ival3" ] {
  75       return 0;
  76     }
  77
  78
  79     # "info watch" is the same as "info break"
  80
  81     if [gdb_test "info watch" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n3\[ \]*.*watchpoint.*ival3" "watchpoint found in watchpoint/breakpoint table" ] {
  82       return 0;
  83     }
  84
  85
  86     # After installing the watchpoint, we disable it until we are ready
  87     # to use it.  This allows the test program to run at full speed until
  88     # we get to the first marker function.
  89
  90     if [gdb_test "disable 3" "disable 3\[\r\n\]+" "disable watchpoint" ] {
  91       return 0;
  92     }
  93
  94
  95     return 1
  96 }
  97
  98 #
  99 # Test simple watchpoint.
 100 #
 101
 102 proc test_simple_watchpoint {} {
 103     global gdb_prompt
 104     global hex
 105     global decimal
 106     global noresults
 107
 108     # Ensure that the watchpoint is disabled when we startup.
 109
 110     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_simple_watchpoint" ] {
 111       return 0;
 112     }
 113
 114
 115     # Run until we get to the first marker function.
 116
 117     gdb_run_cmd
 118     set timeout 600
 119     expect {
 120         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 121             pass "run to marker1 in test_simple_watchpoint"
 122         }
 123         -re ".*$gdb_prompt $" {
 124             fail "run to marker1 in test_simple_watchpoint"
 125             return
 126         }
 127         timeout {
 128             fail "run to marker1 in test_simple_watchpoint (timeout)"
 129             return
 130         }
 131     }
 132
 133     # After reaching the marker function, enable the watchpoint.
 134
 135     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "enable watchpoint" ] {
 136       return ;
 137     }
 138
 139
 140     gdb_test "break func1" "Breakpoint.*at.*"
 141     gdb_test "set \$func1_breakpoint_number = \$bpnum" ""
 142
 143     gdb_test "continue" "Continuing.*Breakpoint \[0-9\]*, func1.*" \
 144         "continue to breakpoint at func1"
 145
 146     # Continue until the first change, from -1 to 0
 147
 148     send_gdb "cont\n"
 149     expect {
 150         -re "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*$gdb_prompt $" {
 151             pass "watchpoint hit, first time"
 152         }
 153         -re "Continuing.*Breakpoint.*func1.*$gdb_prompt $" {
 154             setup_xfail "m68*-*-*" 2597
 155             fail "thought it hit breakpoint at func1 twice"
 156             gdb_test "delete \$func1_breakpoint_number" ""
 157             gdb_test "continue" "\
 158 Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count;" \
 159                 "watchpoint hit, first time"
 160         }
 161         -re ".*$gdb_prompt $" { fail "watchpoint hit, first time" ; return }
 162         timeout { fail "watchpoint hit, first time (timeout)" ; return }
 163         eof { fail "watchpoint hit, first time (eof)" ; return }
 164     }
 165
 166     gdb_test "delete \$func1_breakpoint_number" ""
 167
 168     # Continue until the next change, from 0 to 1.
 169     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit, second time"
 170
 171     # Continue until the next change, from 1 to 2.
 172     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*" "watchpoint hit, third time"
 173
 174     # Continue until the next change, from 2 to 3.
 175     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*" "watchpoint hit, fourth time"
 176
 177     # Continue until the next change, from 3 to 4.
 178     # Note that this one is outside the loop.
 179
 180     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*" "watchpoint hit, fifth time"
 181
 182     # Continue until we hit the finishing marker function.
 183     # Make sure we hit no more watchpoints.
 184
 185     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \(\).*" \
 186         "continue to marker2"
 187
 188     # Disable the watchpoint so we run at full speed until we exit.
 189
 190     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "watchpoint disabled" ] {
 191       return ;
 192     }
 193
 194
 195     # Run until process exits.
 196
 197     if $noresults==1 then { return }
 198
 199     gdb_test "cont" "Continuing.*Program exited normally.*" \
 200         "continue to exit in test_simple_watchpoint"
 201 }
 202
 203 # Test disabling watchpoints.
 204
 205 proc test_disabling_watchpoints {} {
 206     global gdb_prompt
 207     global binfile
 208     global srcfile
 209     global decimal
 210     global hex
 211     global noresults
 212
 213     # Ensure that the watchpoint is disabled when we startup.
 214
 215     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_disabling_watchpoints" ] {
 216       return 0;
 217     }
 218
 219
 220     # Run until we get to the first marker function.
 221
 222     gdb_run_cmd
 223     set timeout 600
 224     expect {
 225         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 226             pass "run to marker1 in test_disabling_watchpoints"
 227         }
 228         -re ".*$gdb_prompt $" {
 229             fail "run to marker1 in test_disabling_watchpoints"
 230             return
 231         }
 232         timeout {
 233             fail "run to marker1 in test_disabling_watchpoints (timeout)"
 234             return
 235         }
 236     }
 237
 238     # After reaching the marker function, enable the watchpoint.
 239
 240     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "watchpoint enabled" ] {
 241       return ;
 242     }
 243
 244
 245     # Continue until the first change, from -1 to 0
 246     # Don't check the old value, because on VxWorks the variable value
 247     # will not have been reinitialized.
 248     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, first time"
 249
 250     # Continue until the next change, from 0 to 1.
 251     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, second time"
 252
 253     # Disable the watchpoint but leave breakpoints
 254
 255     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint #2 in test_disabling_watchpoints" ] {
 256       return 0;
 257     }
 258
 259
 260     # Check watchpoint list, looking for the entry that confirms the
 261     # watchpoint is disabled.
 262     gdb_test "info watchpoints" "3\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*" "watchpoint disabled in table"
 263
 264     # Continue until we hit the finishing marker function.
 265     # Make sure we hit no more watchpoints.
 266     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \\(\\).*" \
 267         "disabled watchpoint skipped"
 268
 269     if $noresults==1 then { return }
 270
 271     gdb_test "cont" "Continuing.*Program exited normally.*" \
 272         "continue to exit in test_disabling_watchpoints"
 273 }
 274
 275 # Test stepping and other mundane operations with watchpoints enabled
 276 proc test_stepping {} {
 277     global gdb_prompt
 278
 279     if [runto marker1] then {
 280         gdb_test "watch ival2" ".*\[Ww\]atchpoint \[0-9\]*: ival2"
 281
 282         # Well, let's not be too mundane.  It should be a *bit* of a challenge
 283         gdb_test "break func2 if 0" "Breakpoint.*at.*"
 284         gdb_test "p \$func2_breakpoint_number = \$bpnum" " = .*"
 285
 286         # The HPPA has a problem here if it's not using hardware watchpoints
 287         if {[ istarget "hppa*-*-*" ] && ![ istarget "hppa*-*-*bsd*" ]} then {
 288             # Don't actually try doing the call, if we do we can't continue.
 289             setup_xfail "*-*-*"
 290             fail "calling function with watchpoint enabled"
 291         } else {
 292             # The problem is that GDB confuses stepping through the call
 293             # dummy with hitting the breakpoint at the end of the call dummy.
 294             # Will be fixed once all architectures define
 295             # CALL_DUMMY_BREAKPOINT_OFFSET.
 296             setup_xfail "*-*-*"
 297             # This doesn't occur if the call dummy starts with a call,
 298             # because we are out of the dummy by the first time the inferior
 299             # stops.
 300             clear_xfail "m68*-*-*"
 301             clear_xfail "i*86*-*-*"
 302             clear_xfail "vax-*-*"
 303             # The following architectures define CALL_DUMMY_BREAKPOINT_OFFSET.
 304             clear_xfail "alpha-*-*"
 305             clear_xfail "mips*-*-*"
 306             clear_xfail "sparc-*-*"
 307             clear_xfail "hppa*-*-*bsd*"
 308             gdb_test "p func1 ()" "= 73" \
 309                 "calling function with watchpoint enabled"
 310         }
 311
 312         #
 313         # "finish" brings us back to main.
 314         # On some targets (e.g. alpha) gdb will stop from the finish in midline
 315         # of the marker1 call. This is due to register restoring code on
 316         # the alpha and might be caused by stack adjustment instructions
 317         # on other targets. In this case we will step once more.
 318         #
 319
 320         send_gdb "finish\n"
 321         expect {
 322             -re "Run.*exit from.*marker1.* at" { }
 323             default { fail "finish from marker1" ; return }
 324         }
 325
 326         expect {
 327             -re "marker1 \\(\\);.*$gdb_prompt $" {
 328                 send_gdb "step\n"
 329                 exp_continue
 330             }
 331             -re "func1 \\(\\);.*$gdb_prompt $" {
 332                 pass "finish from marker1"
 333             }
 334             -re ".*$gdb_prompt $" {
 335                 fail "finish from marker1"
 336             }
 337             default { fail "finish from marker1" ; return }
 338         }
 339
 340         gdb_test "next" "for \\(count = 0.*" "next to `for' in watchpoint.exp"
 341
 342         # Now test that "until" works.  It's a bit tricky to test
 343         # "until", because compilers don't always arrange the code
 344         # exactly the same way, and we might get slightly different
 345         # sequences of statements.  But the following should be true
 346         # (if not it is a compiler or a debugger bug): The user who
 347         # does "until" at every statement of a loop should end up
 348         # stepping through the loop once, and the debugger should not
 349         # stop for any of the remaining iterations.
 350
 351         gdb_test "until" "ival1 = count.*" "until to ival1 assignment"
 352         gdb_test "until" "ival3 = count.*" "until to ival3 assignment"
 353         send_gdb "until\n"
 354         expect {
 355             -re "(for \\(count = 0|\}).*$gdb_prompt $" {
 356                 gdb_test "until" "ival1 = count; /. Outside loop ./" \
 357                     "until out of loop"
 358             }
 359             -re "ival1 = count; /. Outside loop ./.*$gdb_prompt $" {
 360                 pass "until out of loop"
 361             }
 362             -re ".*$gdb_prompt $" {
 363                 fail "until out of loop"
 364             }
 365             default { fail "until out of loop" ; return }
 366         }
 367
 368         gdb_test "step" "ival2 = count.*" "step to ival2 assignment"
 369     }
 370 }
 371
 372 # Test stepping and other mundane operations with watchpoints enabled
 373 proc test_watchpoint_triggered_in_syscall {} {
 374     global gdb_prompt
 375     global noinferiorio
 376     global noresults
 377
 378     if $noinferiorio {
 379         verbose "Skipping test_watchpoint_triggered_in_syscall due to noinferiorio"
 380         return
 381     }
 382     # Run until we get to the first marker function.
 383     set x 0
 384     set y 0
 385     set testname "Watch buffer passed to read syscall"
 386     if [runto marker2] then {
 387         gdb_test "watch buf\[0\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[0\\\]"
 388         gdb_test "watch buf\[1\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[1\\\]"
 389         gdb_test "watch buf\[2\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[2\\\]"
 390         gdb_test "watch buf\[3\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[3\\\]"
 391         gdb_test "watch buf\[4\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[4\\\]"
 392         gdb_test "break marker4" ".*Breakpoint.*"
 393
 394         gdb_test "set doread = 1" ""
 395
 396         # If we send_gdb "123\n" before gdb has switched the tty, then it goes
 397         # to gdb, not the inferior, and we lose.  So that is why we have
 398         # watchpoint.c prompt us, so we can wait for that prompt.
 399         if [gdb_test "continue" "Continuing\\.\r\ntype stuff for buf now:" "continue to read" ] {
 400           return ;
 401         }
 402
 403         send_gdb "123\n"
 404         expect {
 405             -re ".*\[Ww\]atchpoint.*buf\\\[0\\\].*Old value = 0.*New value = 49\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 406             -re ".*\[Ww\]atchpoint.*buf\\\[1\\\].*Old value = 0.*New value = 50\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 407             -re ".*\[Ww\]atchpoint.*buf\\\[2\\\].*Old value = 0.*New value = 51\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 408             -re ".*\[Ww\]atchpoint.*buf\\\[3\\\].*Old value = 0.*New value = 10\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 409             -re ".*$gdb_prompt $" { pass "sent 123" }
 410             timeout { fail "sent 123 (timeout)" }
 411         }
 412
 413         # Examine the values in buf to see how many watchpoints we
 414         # should have printed.
 415         send_gdb "print buf\[0\]\n"
 416         expect {
 417             -re ".*= 49.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[0\]"}
 418             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[0\]"}
 419             -re ".*$gdb_prompt $" { fail "print buf\[0\]"}
 420             default { fail "print buf\[0\]"}
 421         }
 422         send_gdb "print buf\[1\]\n"
 423         expect {
 424             -re ".*= 50.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[1\]"}
 425             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[1\]"}
 426             -re ".*$gdb_prompt $" { fail "print buf\[1\]"}
 427             default { fail "print buf\[1\]"}
 428         }
 429         send_gdb "print buf\[2\]\n"
 430         expect {
 431             -re ".*= 51.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[2\]"}
 432             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[2\]"}
 433             -re ".*$gdb_prompt $" { fail "print buf\[2\]"}
 434             default { fail "print buf\[2\]"}
 435         }
 436         send_gdb "print buf\[3\]\n"
 437         expect {
 438             -re ".*= 10.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[3\]"}
 439             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[3\]"}
 440             -re ".*$gdb_prompt $" { fail "print buf\[3\]" }
 441             default { fail "print buf\[3\]" }
 442         }
 443
 444         # Did we find what we were looking for?  If not, flunk it.
 445         if [expr $x==$y] then { pass $testname } else { fail "$testname (only triggered $x watchpoints, expected $y)"}
 446
 447         # Continue until we hit the finishing marker function.
 448         # Make sure we hit no more watchpoints.
 449         gdb_test "cont" "Continuing.*Breakpoint.*marker4 \\(\\).*" \
 450             "continue to marker4"
 451
 452         # Disable everything so we can finish the program at full speed
 453         gdb_test "disable" "" "disable in test_watchpoint_triggered_in_syscall"
 454
 455         if $noresults==1 then { return }
 456
 457         gdb_test "cont" "Continuing.*Program exited normally.*" \
 458             "continue to exit in test_watchpoint_triggered_in_syscall"
 459     }
 460 }
 461
 462 # Do a simple test of of watching through a pointer when the pointer
 463 # itself changes.  Should add some more complicated stuff here.
 464
 465 proc test_complex_watchpoint {} {
 466     global gdb_prompt
 467     global noresults
 468
 469     if [runto marker4] then {
 470         gdb_test "watch ptr1->val" ".*\[Ww\]atchpoint \[0-9\]*: ptr1->val"
 471         gdb_test "break marker5" ".*Breakpoint.*"
 472
 473         gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ptr1->val.*Old value = 1.*New value = 2.*" "Test complex watchpoint"
 474
 475         # Continue until we hit the marker5 function.
 476         # Make sure we hit no more watchpoints.
 477
 478         gdb_test "cont" "Continuing.*Breakpoint.*marker5 \\(\\).*" \
 479             "did not trigger wrong watchpoint"
 480
 481         # Disable everything so we can finish the program at full speed
 482         gdb_test "disable" "" "disable in test_complex_watchpoint"
 483
 484         if $noresults==1 then { return }
 485
 486         gdb_test "cont" "Continuing.*Program exited normally.*" \
 487             "continue to exit in test_complex_watchpoint"
 488     }
 489 }
 490
 491 # Start with a fresh gdb.
 492
 493 gdb_start
 494 gdb_reinitialize_dir $srcdir/$subdir
 495 gdb_load $binfile
 496 set timeout 600
 497 verbose "Timeout now 600 sec.\n"
 498
 499 if [initialize] then {
 500
 501     test_simple_watchpoint
 502
 503     # The IDT/sim monitor only has 8 (!) open files, of which it uses
 504     # 4 (!).  So we have to make sure one program exits before
 505     # starting another one.
 506     if [istarget "mips-idt-*"] then {
 507         gdb_exit
 508         gdb_start
 509         gdb_reinitialize_dir $srcdir/$subdir
 510         gdb_load $binfile
 511         initialize
 512     }
 513
 514     test_disabling_watchpoints
 515
 516     # See above.
 517     if [istarget "mips-idt-*"] then {
 518         gdb_exit
 519         gdb_start
 520         gdb_reinitialize_dir $srcdir/$subdir
 521         gdb_load $binfile
 522         initialize
 523     }
 524
 525     test_stepping
 526
 527     # See above.
 528     if [istarget "mips-idt-*"] then {
 529         gdb_exit
 530         gdb_start
 531         gdb_reinitialize_dir $srcdir/$subdir
 532         gdb_load $binfile
 533         initialize
 534     }
 535
 536     # Only enabled for some targets merely because it has not been tested
 537     # elsewhere.
 538     # On sparc-sun-sunos4.1.3, GDB was running all the way to the marker4
 539     # breakpoint before stopping for the watchpoint.  I don't know why.
 540     if {[istarget "hppa*-*-*"]} then {
 541         test_watchpoint_triggered_in_syscall
 542     }
 543
 544     # See above.
 545     if [istarget "mips-idt-*"] then {
 546         gdb_exit
 547         gdb_start
 548         gdb_reinitialize_dir $srcdir/$subdir
 549         gdb_load $binfile
 550         initialize
 551     }
 552
 553     # Only enabled for some targets merely because it has not been tested
 554     # elsewhere.
 555     if {[istarget "hppa*-*-*"] || [istarget "sparc*-*-sunos*"]} then {
 556         test_complex_watchpoint
 557     }
 558 }