gdb/testsuite/gdb.base/watchpoint.exp

   1 # Copyright (C) 1992, 1994, 1997, 1998 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
  33
  34 if [get_compiler_info ${binfile}] {
  35     return -1
  36 }
  37
  38 # if we are on HPUX and we are not compiled with gcc, then skip these tests.
  39
  40 if [istarget hppa*-*-hpux*] {
  41     if {!$gcc_compiled} {
  42         continue
  43     }
  44 }
  45
  46
  47 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  48      gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
  49 }
  50
  51 # Prepare for watchpoint tests by setting up two breakpoints and one
  52 # watchpoint.
  53 #
  54 # We use breakpoints at marker functions to get past all the startup code,
  55 # so we can get to the watchpoints in a reasonable amount of time from a
  56 # known starting point.
  57 #
  58 # For simplicity, so we always know how to reference specific breakpoints or
  59 # watchpoints by number, we expect a particular ordering and numbering of
  60 # each in the combined breakpoint/watchpoint table, as follows:
  61 #
  62 #       Number          What            Where
  63 #       1               Breakpoint      marker1()
  64 #       2               Breakpoint      marker2()
  65 #       3               Watchpoint      ival3
  66
  67 proc initialize {} {
  68     global gdb_prompt
  69     global hex
  70     global decimal
  71     global srcfile
  72
  73     if [gdb_test "break marker1" "Breakpoint 1 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker1" ] {
  74       return 0;
  75     }
  76
  77
  78     if [gdb_test "break marker2" "Breakpoint 2 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker2" ] {
  79       return 0;
  80     }
  81
  82
  83     if [gdb_test "info break" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*" "info break in watchpoint.exp" ] {
  84       return 0;
  85     }
  86
  87
  88     if [gdb_test "watch ival3" ".*\[Ww\]atchpoint 3: ival3" "set watchpoint on ival3" ] {
  89       return 0;
  90     }
  91
  92
  93     # "info watch" is the same as "info break"
  94
  95     if [gdb_test "info watch" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n3\[ \]*.*watchpoint.*ival3" "watchpoint found in watchpoint/breakpoint table" ] {
  96       return 0;
  97     }
  98
  99
 100     # After installing the watchpoint, we disable it until we are ready
 101     # to use it.  This allows the test program to run at full speed until
 102     # we get to the first marker function.
 103
 104     if [gdb_test "disable 3" "disable 3\[\r\n\]+" "disable watchpoint" ] {
 105       return 0;
 106     }
 107
 108
 109     return 1
 110 }
 111
 112 #
 113 # Test simple watchpoint.
 114 #
 115
 116 proc test_simple_watchpoint {} {
 117     global gdb_prompt
 118     global hex
 119     global decimal
 120
 121     # Ensure that the watchpoint is disabled when we startup.
 122
 123     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_simple_watchpoint" ] {
 124       return 0;
 125     }
 126
 127
 128     # Run until we get to the first marker function.
 129
 130     gdb_run_cmd
 131     set timeout 600
 132     gdb_expect {
 133         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 134             pass "run to marker1 in test_simple_watchpoint"
 135         }
 136         -re ".*$gdb_prompt $" {
 137             fail "run to marker1 in test_simple_watchpoint"
 138             return
 139         }
 140         timeout {
 141             fail "run to marker1 in test_simple_watchpoint (timeout)"
 142             return
 143         }
 144     }
 145
 146     # After reaching the marker function, enable the watchpoint.
 147
 148     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "enable watchpoint" ] {
 149       return ;
 150     }
 151
 152
 153     gdb_test "break func1" "Breakpoint.*at.*"
 154     gdb_test "set \$func1_breakpoint_number = \$bpnum" ""
 155
 156     gdb_test "continue" "Continuing.*Breakpoint \[0-9\]*, func1.*" \
 157         "continue to breakpoint at func1"
 158
 159     # Continue until the first change, from -1 to 0
 160
 161     send_gdb "cont\n"
 162     gdb_expect {
 163         -re "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*$gdb_prompt $" {
 164             pass "watchpoint hit, first time"
 165         }
 166         -re "Continuing.*Breakpoint.*func1.*$gdb_prompt $" {
 167             setup_xfail "m68*-*-*" 2597
 168             fail "thought it hit breakpoint at func1 twice"
 169             gdb_test "delete \$func1_breakpoint_number" ""
 170             gdb_test "continue" "\
 171 Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count;" \
 172                 "watchpoint hit, first time"
 173         }
 174         -re ".*$gdb_prompt $" { fail "watchpoint hit, first time" ; return }
 175         timeout { fail "watchpoint hit, first time (timeout)" ; return }
 176         eof { fail "watchpoint hit, first time (eof)" ; return }
 177     }
 178
 179     gdb_test "delete \$func1_breakpoint_number" ""
 180
 181     # Continue until the next change, from 0 to 1.
 182     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit, second time"
 183
 184     # Continue until the next change, from 1 to 2.
 185     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*" "watchpoint hit, third time"
 186
 187     # Continue until the next change, from 2 to 3.
 188     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*" "watchpoint hit, fourth time"
 189
 190     # Continue until the next change, from 3 to 4.
 191     # Note that this one is outside the loop.
 192
 193     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*" "watchpoint hit, fifth time"
 194
 195     # Continue until we hit the finishing marker function.
 196     # Make sure we hit no more watchpoints.
 197
 198     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \(\).*" \
 199         "continue to marker2"
 200
 201     # Disable the watchpoint so we run at full speed until we exit.
 202
 203     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "watchpoint disabled" ] {
 204       return ;
 205     }
 206
 207
 208     # Run until process exits.
 209
 210     if [target_info exists gdb,noresults] { return }
 211
 212     gdb_continue_to_end "continue to exit in test_simple_watchpoint"
 213 }
 214
 215 # Test disabling watchpoints.
 216
 217 proc test_disabling_watchpoints {} {
 218     global gdb_prompt
 219     global binfile
 220     global srcfile
 221     global decimal
 222     global hex
 223
 224     # Ensure that the watchpoint is disabled when we startup.
 225
 226     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_disabling_watchpoints" ] {
 227       return 0;
 228     }
 229
 230
 231     # Run until we get to the first marker function.
 232
 233     gdb_run_cmd
 234     set timeout 600
 235     gdb_expect {
 236         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 237             pass "run to marker1 in test_disabling_watchpoints"
 238         }
 239         -re ".*$gdb_prompt $" {
 240             fail "run to marker1 in test_disabling_watchpoints"
 241             return
 242         }
 243         timeout {
 244             fail "run to marker1 in test_disabling_watchpoints (timeout)"
 245             return
 246         }
 247     }
 248
 249     # After reaching the marker function, enable the watchpoint.
 250
 251     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "watchpoint enabled" ] {
 252       return ;
 253     }
 254
 255
 256     # Continue until the first change, from -1 to 0
 257     # Don't check the old value, because on VxWorks the variable value
 258     # will not have been reinitialized.
 259     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, first time"
 260
 261     # Continue until the next change, from 0 to 1.
 262     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"
 263
 264     # Disable the watchpoint but leave breakpoints
 265
 266     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint #2 in test_disabling_watchpoints" ] {
 267       return 0;
 268     }
 269
 270
 271     # Check watchpoint list, looking for the entry that confirms the
 272     # watchpoint is disabled.
 273     gdb_test "info watchpoints" "3\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*" "watchpoint disabled in table"
 274
 275     # Continue until we hit the finishing marker function.
 276     # Make sure we hit no more watchpoints.
 277     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \\(\\).*" \
 278         "disabled watchpoint skipped"
 279
 280     if [target_info exists gdb,noresults] { return }
 281
 282     gdb_continue_to_end "continue to exit in test_disabling_watchpoints"
 283 }
 284
 285 # Test stepping and other mundane operations with watchpoints enabled
 286 proc test_stepping {} {
 287     global gdb_prompt
 288
 289     if [runto marker1] then {
 290         gdb_test "watch ival2" ".*\[Ww\]atchpoint \[0-9\]*: ival2"
 291
 292         # Well, let's not be too mundane.  It should be a *bit* of a challenge
 293         gdb_test "break func2 if 0" "Breakpoint.*at.*"
 294         gdb_test "p \$func2_breakpoint_number = \$bpnum" " = .*"
 295
 296         # The HPPA has a problem here if it's not using hardware watchpoints
 297         if {[ istarget "hppa*-*-*" ] && ![ istarget "hppa*-*-*bsd*" ]} then {
 298             # Don't actually try doing the call, if we do we can't continue.
 299             setup_xfail "*-*-*"
 300             fail "calling function with watchpoint enabled"
 301         } else {
 302             # The problem is that GDB confuses stepping through the call
 303             # dummy with hitting the breakpoint at the end of the call dummy.
 304             # Will be fixed once all architectures define
 305             # CALL_DUMMY_BREAKPOINT_OFFSET.
 306             setup_xfail "*-*-*"
 307             # This doesn't occur if the call dummy starts with a call,
 308             # because we are out of the dummy by the first time the inferior
 309             # stops.
 310             clear_xfail "d10v*-*-*"
 311             clear_xfail "m68*-*-*"
 312             clear_xfail "i*86*-*-*"
 313             clear_xfail "vax-*-*"
 314             # The following architectures define CALL_DUMMY_BREAKPOINT_OFFSET.
 315             clear_xfail "alpha-*-*"
 316             clear_xfail "mips*-*-*"
 317             clear_xfail "sparc-*-*"
 318             clear_xfail "hppa*-*-*bsd*"
 319             # It works with the generic inferior function calling code too.
 320             clear_xfail "mn10200*-*-*"
 321             clear_xfail "mn10300*-*-*"
 322             gdb_test "p func1 ()" "= 73" \
 323                 "calling function with watchpoint enabled"
 324         }
 325
 326         #
 327         # "finish" brings us back to main.
 328         # On some targets (e.g. alpha) gdb will stop from the finish in midline
 329         # of the marker1 call. This is due to register restoring code on
 330         # the alpha and might be caused by stack adjustment instructions
 331         # on other targets. In this case we will step once more.
 332         #
 333
 334         send_gdb "finish\n"
 335         gdb_expect {
 336             -re "Run.*exit from.*marker1.* at" { }
 337             default { fail "finish from marker1" ; return }
 338         }
 339
 340         gdb_expect {
 341             -re "marker1 \\(\\);.*$gdb_prompt $" {
 342                 send_gdb "step\n"
 343                 exp_continue
 344             }
 345             -re "func1 \\(\\);.*$gdb_prompt $" {
 346                 pass "finish from marker1"
 347             }
 348             -re ".*$gdb_prompt $" {
 349                 fail "finish from marker1"
 350             }
 351             default { fail "finish from marker1" ; return }
 352         }
 353
 354         gdb_test "next" "for \\(count = 0.*" "next to `for' in watchpoint.exp"
 355
 356         # Now test that "until" works.  It's a bit tricky to test
 357         # "until", because compilers don't always arrange the code
 358         # exactly the same way, and we might get slightly different
 359         # sequences of statements.  But the following should be true
 360         # (if not it is a compiler or a debugger bug): The user who
 361         # does "until" at every statement of a loop should end up
 362         # stepping through the loop once, and the debugger should not
 363         # stop for any of the remaining iterations.
 364
 365         gdb_test "until" "ival1 = count.*" "until to ival1 assignment"
 366         gdb_test "until" "ival3 = count.*" "until to ival3 assignment"
 367         send_gdb "until\n"
 368         gdb_expect {
 369             -re "(for \\(count = 0|\}).*$gdb_prompt $" {
 370                 gdb_test "until" "ival1 = count; /. Outside loop ./" \
 371                     "until out of loop"
 372             }
 373             -re "ival1 = count; /. Outside loop ./.*$gdb_prompt $" {
 374                 pass "until out of loop"
 375             }
 376             -re ".*$gdb_prompt $" {
 377                 fail "until out of loop"
 378             }
 379             default { fail "until out of loop" ; return }
 380         }
 381
 382         gdb_test "step" "ival2 = count.*" "step to ival2 assignment"
 383     }
 384 }
 385
 386 # Test stepping and other mundane operations with watchpoints enabled
 387 proc test_watchpoint_triggered_in_syscall {} {
 388     global gdb_prompt
 389
 390     if [target_info exists gdb,noinferiorio] {
 391         verbose "Skipping test_watchpoint_triggered_in_syscall due to noinferiorio"
 392         return
 393     }
 394     # Run until we get to the first marker function.
 395     set x 0
 396     set y 0
 397     set testname "Watch buffer passed to read syscall"
 398     if [runto marker2] then {
 399         gdb_test "watch buf\[0\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[0\\\]"
 400         gdb_test "watch buf\[1\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[1\\\]"
 401         gdb_test "watch buf\[2\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[2\\\]"
 402         gdb_test "watch buf\[3\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[3\\\]"
 403         gdb_test "watch buf\[4\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[4\\\]"
 404         gdb_test "break marker4" ".*Breakpoint.*"
 405
 406         gdb_test "set doread = 1" ""
 407
 408         # If we send_gdb "123\n" before gdb has switched the tty, then it goes
 409         # to gdb, not the inferior, and we lose.  So that is why we have
 410         # watchpoint.c prompt us, so we can wait for that prompt.
 411         send_gdb "continue\n";
 412         gdb_expect {
 413             -re "Continuing\\.\r\ntype stuff for buf now:" {
 414                 pass "continue to read"
 415             }
 416             default {
 417                 fail "continue to read";
 418                 return ;
 419             }
 420         }
 421
 422         send_gdb "123\n"
 423         gdb_expect {
 424             -re ".*\[Ww\]atchpoint.*buf\\\[0\\\].*Old value = 0.*New value = 49\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 425             -re ".*\[Ww\]atchpoint.*buf\\\[1\\\].*Old value = 0.*New value = 50\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 426             -re ".*\[Ww\]atchpoint.*buf\\\[2\\\].*Old value = 0.*New value = 51\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 427             -re ".*\[Ww\]atchpoint.*buf\\\[3\\\].*Old value = 0.*New value = 10\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 428             -re ".*$gdb_prompt $" { pass "sent 123" }
 429             timeout { fail "sent 123 (timeout)" }
 430         }
 431
 432         # Examine the values in buf to see how many watchpoints we
 433         # should have printed.
 434         send_gdb "print buf\[0\]\n"
 435         gdb_expect {
 436             -re ".*= 49.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[0\]"}
 437             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[0\]"}
 438             -re ".*$gdb_prompt $" { fail "print buf\[0\]"}
 439             default { fail "print buf\[0\]"}
 440         }
 441         send_gdb "print buf\[1\]\n"
 442         gdb_expect {
 443             -re ".*= 50.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[1\]"}
 444             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[1\]"}
 445             -re ".*$gdb_prompt $" { fail "print buf\[1\]"}
 446             default { fail "print buf\[1\]"}
 447         }
 448         send_gdb "print buf\[2\]\n"
 449         gdb_expect {
 450             -re ".*= 51.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[2\]"}
 451             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[2\]"}
 452             -re ".*$gdb_prompt $" { fail "print buf\[2\]"}
 453             default { fail "print buf\[2\]"}
 454         }
 455         send_gdb "print buf\[3\]\n"
 456         gdb_expect {
 457             -re ".*= 10.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[3\]"}
 458             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[3\]"}
 459             -re ".*$gdb_prompt $" { fail "print buf\[3\]" }
 460             default { fail "print buf\[3\]" }
 461         }
 462
 463         # Did we find what we were looking for?  If not, flunk it.
 464         if [expr $x==$y] then { pass $testname } else { fail "$testname (only triggered $x watchpoints, expected $y)"}
 465
 466         # Continue until we hit the finishing marker function.
 467         # Make sure we hit no more watchpoints.
 468         gdb_test "cont" "Continuing.*Breakpoint.*marker4 \\(\\).*" \
 469             "continue to marker4"
 470
 471         # Disable everything so we can finish the program at full speed
 472         gdb_test "disable" "" "disable in test_watchpoint_triggered_in_syscall"
 473
 474         if [target_info exists gdb,noresults] { return }
 475
 476         gdb_continue_to_end "continue to exit in test_watchpoint_triggered_in_syscall"
 477     }
 478 }
 479
 480 # Do a simple test of of watching through a pointer when the pointer
 481 # itself changes.  Should add some more complicated stuff here.
 482
 483 proc test_complex_watchpoint {} {
 484     global gdb_prompt
 485
 486     if [runto marker4] then {
 487         gdb_test "watch ptr1->val" ".*\[Ww\]atchpoint \[0-9\]*: ptr1->val"
 488         gdb_test "break marker5" ".*Breakpoint.*"
 489
 490         gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ptr1->val.*Old value = 1.*New value = 2.*" "Test complex watchpoint"
 491
 492         # Continue until we hit the marker5 function.
 493         # Make sure we hit no more watchpoints.
 494
 495         gdb_test "cont" "Continuing.*Breakpoint.*marker5 \\(\\).*" \
 496             "did not trigger wrong watchpoint"
 497
 498         # Disable everything so we can finish the program at full speed
 499         gdb_test "disable" "" "disable in test_complex_watchpoint"
 500
 501         if [target_info exists gdb,noresults] { return }
 502
 503
 504         gdb_continue_to_end "continue to exit in test_complex_watchpoint"
 505     }
 506 }
 507
 508 # Start with a fresh gdb.
 509
 510 gdb_start
 511 gdb_reinitialize_dir $srcdir/$subdir
 512 gdb_load $binfile
 513 set timeout 600
 514 verbose "Timeout now 600 sec.\n"
 515
 516 if [initialize] then {
 517
 518     test_simple_watchpoint
 519
 520     # The IDT/sim monitor only has 8 (!) open files, of which it uses
 521     # 4 (!).  So we have to make sure one program exits before
 522     # starting another one.
 523     if [istarget "mips-idt-*"] then {
 524         gdb_exit
 525         gdb_start
 526         gdb_reinitialize_dir $srcdir/$subdir
 527         gdb_load $binfile
 528         initialize
 529     }
 530
 531     test_disabling_watchpoints
 532
 533     # See above.
 534     if [istarget "mips-idt-*"] then {
 535         gdb_exit
 536         gdb_start
 537         gdb_reinitialize_dir $srcdir/$subdir
 538         gdb_load $binfile
 539         initialize
 540     }
 541
 542     if ![target_info exists gdb,cannot_call_functions] {
 543         test_stepping
 544
 545         # See above.
 546         if [istarget "mips-idt-*"] then {
 547             gdb_exit
 548             gdb_start
 549             gdb_reinitialize_dir $srcdir/$subdir
 550             gdb_load $binfile
 551             initialize
 552         }
 553     }
 554
 555     # Only enabled for some targets merely because it has not been tested
 556     # elsewhere.
 557     # On sparc-sun-sunos4.1.3, GDB was running all the way to the marker4
 558     # breakpoint before stopping for the watchpoint.  I don't know why.
 559     if {[istarget "hppa*-*-*"]} then {
 560         test_watchpoint_triggered_in_syscall
 561     }
 562
 563     # See above.
 564     if [istarget "mips-idt-*"] then {
 565         gdb_exit
 566         gdb_start
 567         gdb_reinitialize_dir $srcdir/$subdir
 568         gdb_load $binfile
 569         initialize
 570     }
 571
 572     # Only enabled for some targets merely because it has not been tested
 573     # elsewhere.
 574     if {[istarget "hppa*-*-*"] || \
 575             [istarget "sparc*-*-sunos*"] || \
 576             [istarget "m32r-*-*"]} then {
 577         test_complex_watchpoint
 578     }
 579 }