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_test "cont" "Continuing.*Program exited normally.*" \
 213         "continue to exit in test_simple_watchpoint"
 214 }
 215
 216 # Test disabling watchpoints.
 217
 218 proc test_disabling_watchpoints {} {
 219     global gdb_prompt
 220     global binfile
 221     global srcfile
 222     global decimal
 223     global hex
 224
 225     # Ensure that the watchpoint is disabled when we startup.
 226
 227     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_disabling_watchpoints" ] {
 228       return 0;
 229     }
 230
 231
 232     # Run until we get to the first marker function.
 233
 234     gdb_run_cmd
 235     set timeout 600
 236     gdb_expect {
 237         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 238             pass "run to marker1 in test_disabling_watchpoints"
 239         }
 240         -re ".*$gdb_prompt $" {
 241             fail "run to marker1 in test_disabling_watchpoints"
 242             return
 243         }
 244         timeout {
 245             fail "run to marker1 in test_disabling_watchpoints (timeout)"
 246             return
 247         }
 248     }
 249
 250     # After reaching the marker function, enable the watchpoint.
 251
 252     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "watchpoint enabled" ] {
 253       return ;
 254     }
 255
 256
 257     # Continue until the first change, from -1 to 0
 258     # Don't check the old value, because on VxWorks the variable value
 259     # will not have been reinitialized.
 260     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, first time"
 261
 262     # Continue until the next change, from 0 to 1.
 263     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"
 264
 265     # Disable the watchpoint but leave breakpoints
 266
 267     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint #2 in test_disabling_watchpoints" ] {
 268       return 0;
 269     }
 270
 271
 272     # Check watchpoint list, looking for the entry that confirms the
 273     # watchpoint is disabled.
 274     gdb_test "info watchpoints" "3\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*" "watchpoint disabled in table"
 275
 276     # Continue until we hit the finishing marker function.
 277     # Make sure we hit no more watchpoints.
 278     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \\(\\).*" \
 279         "disabled watchpoint skipped"
 280
 281     if [target_info exists gdb,noresults] { return }
 282
 283     gdb_test "cont" "Continuing.*Program exited normally.*" \
 284         "continue to exit in test_disabling_watchpoints"
 285 }
 286
 287 # Test stepping and other mundane operations with watchpoints enabled
 288 proc test_stepping {} {
 289     global gdb_prompt
 290
 291     if [runto marker1] then {
 292         gdb_test "watch ival2" ".*\[Ww\]atchpoint \[0-9\]*: ival2"
 293
 294         # Well, let's not be too mundane.  It should be a *bit* of a challenge
 295         gdb_test "break func2 if 0" "Breakpoint.*at.*"
 296         gdb_test "p \$func2_breakpoint_number = \$bpnum" " = .*"
 297
 298         # The HPPA has a problem here if it's not using hardware watchpoints
 299         if {[ istarget "hppa*-*-*" ] && ![ istarget "hppa*-*-*bsd*" ]} then {
 300             # Don't actually try doing the call, if we do we can't continue.
 301             setup_xfail "*-*-*"
 302             fail "calling function with watchpoint enabled"
 303         } else {
 304             # The problem is that GDB confuses stepping through the call
 305             # dummy with hitting the breakpoint at the end of the call dummy.
 306             # Will be fixed once all architectures define
 307             # CALL_DUMMY_BREAKPOINT_OFFSET.
 308             setup_xfail "*-*-*"
 309             # This doesn't occur if the call dummy starts with a call,
 310             # because we are out of the dummy by the first time the inferior
 311             # stops.
 312             clear_xfail "d10v*-*-*"
 313             clear_xfail "m68*-*-*"
 314             clear_xfail "i*86*-*-*"
 315             clear_xfail "vax-*-*"
 316             # The following architectures define CALL_DUMMY_BREAKPOINT_OFFSET.
 317             clear_xfail "alpha-*-*"
 318             clear_xfail "mips*-*-*"
 319             clear_xfail "sparc-*-*"
 320             clear_xfail "hppa*-*-*bsd*"
 321             # It works with the generic inferior function calling code too.
 322             clear_xfail "mn10200*-*-*"
 323             clear_xfail "mn10300*-*-*"
 324             gdb_test "p func1 ()" "= 73" \
 325                 "calling function with watchpoint enabled"
 326         }
 327
 328         #
 329         # "finish" brings us back to main.
 330         # On some targets (e.g. alpha) gdb will stop from the finish in midline
 331         # of the marker1 call. This is due to register restoring code on
 332         # the alpha and might be caused by stack adjustment instructions
 333         # on other targets. In this case we will step once more.
 334         #
 335
 336         send_gdb "finish\n"
 337         gdb_expect {
 338             -re "Run.*exit from.*marker1.* at" { }
 339             default { fail "finish from marker1" ; return }
 340         }
 341
 342         gdb_expect {
 343             -re "marker1 \\(\\);.*$gdb_prompt $" {
 344                 send_gdb "step\n"
 345                 exp_continue
 346             }
 347             -re "func1 \\(\\);.*$gdb_prompt $" {
 348                 pass "finish from marker1"
 349             }
 350             -re ".*$gdb_prompt $" {
 351                 fail "finish from marker1"
 352             }
 353             default { fail "finish from marker1" ; return }
 354         }
 355
 356         gdb_test "next" "for \\(count = 0.*" "next to `for' in watchpoint.exp"
 357
 358         # Now test that "until" works.  It's a bit tricky to test
 359         # "until", because compilers don't always arrange the code
 360         # exactly the same way, and we might get slightly different
 361         # sequences of statements.  But the following should be true
 362         # (if not it is a compiler or a debugger bug): The user who
 363         # does "until" at every statement of a loop should end up
 364         # stepping through the loop once, and the debugger should not
 365         # stop for any of the remaining iterations.
 366
 367         gdb_test "until" "ival1 = count.*" "until to ival1 assignment"
 368         gdb_test "until" "ival3 = count.*" "until to ival3 assignment"
 369         send_gdb "until\n"
 370         gdb_expect {
 371             -re "(for \\(count = 0|\}).*$gdb_prompt $" {
 372                 gdb_test "until" "ival1 = count; /. Outside loop ./" \
 373                     "until out of loop"
 374             }
 375             -re "ival1 = count; /. Outside loop ./.*$gdb_prompt $" {
 376                 pass "until out of loop"
 377             }
 378             -re ".*$gdb_prompt $" {
 379                 fail "until out of loop"
 380             }
 381             default { fail "until out of loop" ; return }
 382         }
 383
 384         gdb_test "step" "ival2 = count.*" "step to ival2 assignment"
 385     }
 386 }
 387
 388 # Test stepping and other mundane operations with watchpoints enabled
 389 proc test_watchpoint_triggered_in_syscall {} {
 390     global gdb_prompt
 391
 392     if [target_info exists gdb,noinferiorio] {
 393         verbose "Skipping test_watchpoint_triggered_in_syscall due to noinferiorio"
 394         return
 395     }
 396     # Run until we get to the first marker function.
 397     set x 0
 398     set y 0
 399     set testname "Watch buffer passed to read syscall"
 400     if [runto marker2] then {
 401         gdb_test "watch buf\[0\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[0\\\]"
 402         gdb_test "watch buf\[1\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[1\\\]"
 403         gdb_test "watch buf\[2\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[2\\\]"
 404         gdb_test "watch buf\[3\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[3\\\]"
 405         gdb_test "watch buf\[4\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[4\\\]"
 406         gdb_test "break marker4" ".*Breakpoint.*"
 407
 408         gdb_test "set doread = 1" ""
 409
 410         # If we send_gdb "123\n" before gdb has switched the tty, then it goes
 411         # to gdb, not the inferior, and we lose.  So that is why we have
 412         # watchpoint.c prompt us, so we can wait for that prompt.
 413         send_gdb "continue\n";
 414         gdb_expect {
 415             -re "Continuing\\.\r\ntype stuff for buf now:" {
 416                 pass "continue to read"
 417             }
 418             default {
 419                 fail "continue to read";
 420                 return ;
 421             }
 422         }
 423
 424         send_gdb "123\n"
 425         gdb_expect {
 426             -re ".*\[Ww\]atchpoint.*buf\\\[0\\\].*Old value = 0.*New value = 49\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 427             -re ".*\[Ww\]atchpoint.*buf\\\[1\\\].*Old value = 0.*New value = 50\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 428             -re ".*\[Ww\]atchpoint.*buf\\\[2\\\].*Old value = 0.*New value = 51\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 429             -re ".*\[Ww\]atchpoint.*buf\\\[3\\\].*Old value = 0.*New value = 10\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 430             -re ".*$gdb_prompt $" { pass "sent 123" }
 431             timeout { fail "sent 123 (timeout)" }
 432         }
 433
 434         # Examine the values in buf to see how many watchpoints we
 435         # should have printed.
 436         send_gdb "print buf\[0\]\n"
 437         gdb_expect {
 438             -re ".*= 49.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[0\]"}
 439             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[0\]"}
 440             -re ".*$gdb_prompt $" { fail "print buf\[0\]"}
 441             default { fail "print buf\[0\]"}
 442         }
 443         send_gdb "print buf\[1\]\n"
 444         gdb_expect {
 445             -re ".*= 50.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[1\]"}
 446             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[1\]"}
 447             -re ".*$gdb_prompt $" { fail "print buf\[1\]"}
 448             default { fail "print buf\[1\]"}
 449         }
 450         send_gdb "print buf\[2\]\n"
 451         gdb_expect {
 452             -re ".*= 51.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[2\]"}
 453             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[2\]"}
 454             -re ".*$gdb_prompt $" { fail "print buf\[2\]"}
 455             default { fail "print buf\[2\]"}
 456         }
 457         send_gdb "print buf\[3\]\n"
 458         gdb_expect {
 459             -re ".*= 10.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[3\]"}
 460             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[3\]"}
 461             -re ".*$gdb_prompt $" { fail "print buf\[3\]" }
 462             default { fail "print buf\[3\]" }
 463         }
 464
 465         # Did we find what we were looking for?  If not, flunk it.
 466         if [expr $x==$y] then { pass $testname } else { fail "$testname (only triggered $x watchpoints, expected $y)"}
 467
 468         # Continue until we hit the finishing marker function.
 469         # Make sure we hit no more watchpoints.
 470         gdb_test "cont" "Continuing.*Breakpoint.*marker4 \\(\\).*" \
 471             "continue to marker4"
 472
 473         # Disable everything so we can finish the program at full speed
 474         gdb_test "disable" "" "disable in test_watchpoint_triggered_in_syscall"
 475
 476         if [target_info exists gdb,noresults] { return }
 477
 478         gdb_test "cont" "Continuing.*Program exited normally.*" \
 479             "continue to exit in test_watchpoint_triggered_in_syscall"
 480     }
 481 }
 482
 483 # Do a simple test of of watching through a pointer when the pointer
 484 # itself changes.  Should add some more complicated stuff here.
 485
 486 proc test_complex_watchpoint {} {
 487     global gdb_prompt
 488
 489     if [runto marker4] then {
 490         gdb_test "watch ptr1->val" ".*\[Ww\]atchpoint \[0-9\]*: ptr1->val"
 491         gdb_test "break marker5" ".*Breakpoint.*"
 492
 493         gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ptr1->val.*Old value = 1.*New value = 2.*" "Test complex watchpoint"
 494
 495         # Continue until we hit the marker5 function.
 496         # Make sure we hit no more watchpoints.
 497
 498         gdb_test "cont" "Continuing.*Breakpoint.*marker5 \\(\\).*" \
 499             "did not trigger wrong watchpoint"
 500
 501         # Disable everything so we can finish the program at full speed
 502         gdb_test "disable" "" "disable in test_complex_watchpoint"
 503
 504         if [target_info exists gdb,noresults] { return }
 505
 506
 507         gdb_test "cont" "Continuing.*Program exited normally.*" \
 508             "continue to exit in test_complex_watchpoint"
 509     }
 510 }
 511
 512 # Start with a fresh gdb.
 513
 514 gdb_start
 515 gdb_reinitialize_dir $srcdir/$subdir
 516 gdb_load $binfile
 517 set timeout 600
 518 verbose "Timeout now 600 sec.\n"
 519
 520 if [initialize] then {
 521
 522     test_simple_watchpoint
 523
 524     # The IDT/sim monitor only has 8 (!) open files, of which it uses
 525     # 4 (!).  So we have to make sure one program exits before
 526     # starting another one.
 527     if [istarget "mips-idt-*"] then {
 528         gdb_exit
 529         gdb_start
 530         gdb_reinitialize_dir $srcdir/$subdir
 531         gdb_load $binfile
 532         initialize
 533     }
 534
 535     test_disabling_watchpoints
 536
 537     # See above.
 538     if [istarget "mips-idt-*"] then {
 539         gdb_exit
 540         gdb_start
 541         gdb_reinitialize_dir $srcdir/$subdir
 542         gdb_load $binfile
 543         initialize
 544     }
 545
 546     if ![target_info exists gdb,cannot_call_functions] {
 547         test_stepping
 548
 549         # See above.
 550         if [istarget "mips-idt-*"] then {
 551             gdb_exit
 552             gdb_start
 553             gdb_reinitialize_dir $srcdir/$subdir
 554             gdb_load $binfile
 555             initialize
 556         }
 557     }
 558
 559     # Only enabled for some targets merely because it has not been tested
 560     # elsewhere.
 561     # On sparc-sun-sunos4.1.3, GDB was running all the way to the marker4
 562     # breakpoint before stopping for the watchpoint.  I don't know why.
 563     if {[istarget "hppa*-*-*"]} then {
 564         test_watchpoint_triggered_in_syscall
 565     }
 566
 567     # See above.
 568     if [istarget "mips-idt-*"] then {
 569         gdb_exit
 570         gdb_start
 571         gdb_reinitialize_dir $srcdir/$subdir
 572         gdb_load $binfile
 573         initialize
 574     }
 575
 576     # Only enabled for some targets merely because it has not been tested
 577     # elsewhere.
 578     if {[istarget "hppa*-*-*"] || \
 579             [istarget "sparc*-*-sunos*"] || \
 580             [istarget "m32r-*-*"]} then {
 581         test_complex_watchpoint
 582     }
 583 }