gdb/testsuite/gdb.base/watchpoint.exp

   1 # Copyright 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2000
   2 # 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 # bug-gdb@prep.ai.mit.edu
  20
  21 # This file was written by Fred Fish. (fnf@cygnus.com)
  22
  23 if $tracelevel then {
  24     strace $tracelevel
  25 }
  26
  27 set prms_id 0
  28 set bug_id 0
  29
  30 set testfile "watchpoint"
  31 set srcfile ${testfile}.c
  32 set binfile ${objdir}/${subdir}/${testfile}
  33
  34 set wp_set 1
  35
  36 if [get_compiler_info ${binfile}] {
  37     return -1
  38 }
  39
  40 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  41      gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
  42 }
  43
  44 # Prepare for watchpoint tests by setting up two breakpoints and one
  45 # watchpoint.
  46 #
  47 # We use breakpoints at marker functions to get past all the startup code,
  48 # so we can get to the watchpoints in a reasonable amount of time from a
  49 # known starting point.
  50 #
  51 # For simplicity, so we always know how to reference specific breakpoints or
  52 # watchpoints by number, we expect a particular ordering and numbering of
  53 # each in the combined breakpoint/watchpoint table, as follows:
  54 #
  55 #       Number          What            Where
  56 #       1               Breakpoint      marker1()
  57 #       2               Breakpoint      marker2()
  58 #       3               Watchpoint      ival3
  59
  60 proc initialize {} {
  61     global gdb_prompt
  62     global hex
  63     global decimal
  64     global srcfile
  65     global wp_set
  66
  67     # Disable hardware watchpoints if necessary.
  68     if [target_info exists gdb,no_hardware_watchpoints] {
  69         gdb_test "set can-use-hw-watchpoints 0" "" ""
  70     }
  71
  72     if [gdb_test "break marker1" "Breakpoint 1 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker1" ] {
  73       return 0;
  74     }
  75
  76
  77     if [gdb_test "break marker2" "Breakpoint 2 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker2" ] {
  78       return 0;
  79     }
  80
  81
  82     if [gdb_test "info break" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*" "info break in watchpoint.exp" ] {
  83       return 0;
  84     }
  85
  86
  87     # ??rehrauer: To fix DTS #CHFts23014, in which setting a watchpoint
  88     # before running can cause the inferior to croak on HP-UX 11.0 for
  89     # reasons yet unknown, we've disabled the ability to set watches
  90     # without a running inferior.  Verify the restriction.
  91     #
  92     send_gdb "watch ival3\n"
  93     gdb_expect {
  94         -re ".*\[Ww\]atchpoint 3: ival3.*$gdb_prompt $" {
  95             pass "set watchpoint on ival3"
  96         }
  97         -re "warning: can't do that without a running program; try \"break main\", \"run\" first.*$gdb_prompt $" {
  98             pass "set watchpoint on ival3"
  99             set wp_set 0
 100             return 1
 101         }
 102         timeout {
 103             fail "(timeout) set watchpoint on ival3"
 104             return 0
 105         }
 106     }
 107
 108     # "info watch" is the same as "info break"
 109
 110     if [gdb_test "info watch" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n3\[ \]*.*watchpoint.*ival3" "watchpoint found in watchpoint/breakpoint table" ] {
 111       return 0;
 112     }
 113
 114
 115     # After installing the watchpoint, we disable it until we are ready
 116     # to use it.  This allows the test program to run at full speed until
 117     # we get to the first marker function.
 118
 119     if [gdb_test "disable 3" "disable 3\[\r\n\]+" "disable watchpoint" ] {
 120       return 0;
 121     }
 122
 123
 124     return 1
 125 }
 126
 127 #
 128 # Test simple watchpoint.
 129 #
 130
 131 proc test_simple_watchpoint {} {
 132     global gdb_prompt
 133     global hex
 134     global decimal
 135     global wp_set
 136
 137     # Ensure that the watchpoint is disabled when we startup.
 138
 139     if { $wp_set } {
 140         if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_simple_watchpoint" ] {
 141             return 0;
 142         }
 143     }
 144
 145
 146     # Run until we get to the first marker function.
 147
 148     gdb_run_cmd
 149     set timeout 600
 150     gdb_expect {
 151         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 152             pass "run to marker1 in test_simple_watchpoint"
 153         }
 154         -re ".*$gdb_prompt $" {
 155             fail "run to marker1 in test_simple_watchpoint"
 156             return
 157         }
 158         timeout {
 159             fail "run to marker1 in test_simple_watchpoint (timeout)"
 160             return
 161         }
 162     }
 163
 164     if { !$wp_set } {
 165         # ??rehrauer: To fix DTS #CHFts23014, in which setting a watchpoint
 166         # before running can cause the inferior to croak on HP-UX 11.0
 167         # for reasons yet unknown, we've disabled the ability to set
 168         # watches without a running inferior.  The following testpoints used
 169         # to be in [initialize].
 170         #
 171         send_gdb "watch ival3\n"
 172         gdb_expect {
 173             -re ".*\[Ww\]atchpoint 3: ival3\r\n$gdb_prompt $" {
 174                 pass "set watchpoint on ival3"
 175             }
 176             -re ".*$gdb_prompt $" { fail "set watchpoint on ival3"  }
 177             timeout { fail "set watchpoint on ival3 (timeout)"  }
 178         }
 179
 180         set wp_set 1
 181
 182         # "info watch" is the same as "info break"
 183
 184         send_gdb "info watch\n"
 185         gdb_expect {
 186             -re "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n3\[ \]*.*watchpoint.*ival3\r\n$gdb_prompt $" {
 187                 pass "watchpoint found in watchpoint/breakpoint table"
 188             }
 189             -re ".*$gdb_prompt $" {
 190                 fail "watchpoint found in watchpoint/breakpoint table"
 191             }
 192             timeout {
 193                fail "watchpoint found in watchpoint/breakpoint table"
 194             }
 195         }
 196
 197         # After installing the watchpoint, we disable it until we are ready
 198         # to use it.  This allows the test program to run at full speed until
 199         # we get to the first marker function.
 200
 201         send_gdb "disable 3\n"
 202         gdb_expect {
 203             -re "disable 3\[\r\n\]+$gdb_prompt $" { pass "disable watchpoint" }
 204             -re ".*$gdb_prompt $" { fail "disable watchpoint"  }
 205             timeout { fail "disable watchpoint (timeout)"  }
 206         }
 207     }
 208
 209     # After reaching the marker function, enable the watchpoint.
 210
 211     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "enable watchpoint" ] {
 212       return ;
 213     }
 214
 215
 216     gdb_test "break func1" "Breakpoint.*at.*"
 217     gdb_test "set \$func1_breakpoint_number = \$bpnum" ""
 218
 219     gdb_test "continue" "Continuing.*Breakpoint \[0-9\]*, func1.*" \
 220         "continue to breakpoint at func1"
 221
 222     # Continue until the first change, from -1 to 0
 223
 224     send_gdb "cont\n"
 225     gdb_expect {
 226         -re "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*$gdb_prompt $" {
 227             pass "watchpoint hit, first time"
 228         }
 229         -re "Continuing.*Breakpoint.*func1.*$gdb_prompt $" {
 230             setup_xfail "m68*-*-*" 2597
 231             fail "thought it hit breakpoint at func1 twice"
 232             gdb_test "delete \$func1_breakpoint_number" ""
 233             gdb_test "continue" "\
 234 Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count;" \
 235                 "watchpoint hit, first time"
 236         }
 237         -re ".*$gdb_prompt $" { fail "watchpoint hit, first time" ; return }
 238         timeout { fail "watchpoint hit, first time (timeout)" ; return }
 239         eof { fail "watchpoint hit, first time (eof)" ; return }
 240     }
 241
 242     # Check that the hit count is reported correctly
 243     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 1 time.*" "Watchpoint hit count is 1"
 244
 245     gdb_test "delete \$func1_breakpoint_number" ""
 246
 247     # Continue until the next change, from 0 to 1.
 248     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit, second time"
 249
 250     # Check that the hit count is reported correctly
 251     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 2 times.*" "Watchpoint hit count is 2"
 252
 253     # Continue until the next change, from 1 to 2.
 254     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*" "watchpoint hit, third time"
 255
 256     # Check that the hit count is reported correctly
 257     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 3 times.*" "Watchpoint hit count is 3"
 258
 259     # Continue until the next change, from 2 to 3.
 260     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*" "watchpoint hit, fourth time"
 261
 262     # Check that the hit count is reported correctly
 263     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 4 times.*" "Watchpoint hit count is 4"
 264
 265     # Continue until the next change, from 3 to 4.
 266     # Note that this one is outside the loop.
 267
 268     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*" "watchpoint hit, fifth time"
 269
 270     # Check that the hit count is reported correctly
 271     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 5 times.*" "Watchpoint hit count is 5"
 272
 273     # Continue until we hit the finishing marker function.
 274     # Make sure we hit no more watchpoints.
 275
 276     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \(\).*" \
 277         "continue to marker2"
 278
 279     # Disable the watchpoint so we run at full speed until we exit.
 280
 281     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "watchpoint disabled" ] {
 282       return ;
 283     }
 284
 285
 286     # Run until process exits.
 287
 288     if [target_info exists gdb,noresults] { return }
 289
 290     gdb_continue_to_end "continue to exit in test_simple_watchpoint"
 291 }
 292
 293 # Test disabling watchpoints.
 294
 295 proc test_disabling_watchpoints {} {
 296     global gdb_prompt
 297     global binfile
 298     global srcfile
 299     global decimal
 300     global hex
 301
 302     # "info watch" is the same as "info break"
 303     gdb_test "info watch" "\[0-9\]+\[ \]*breakpoint.*marker1.*\r\n\[0-9\]+\[ \]*breakpoint.*marker2.*\r\n\[0-9]+\[ \]*.*watchpoint.*ival3\r\n\.*\[0-9\]+ times.*" "watchpoints found in watchpoint/breakpoint table"
 304
 305     # Ensure that the watchpoint is disabled when we startup.
 306
 307     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_disabling_watchpoints" ] {
 308       return 0;
 309     }
 310
 311
 312     # Run until we get to the first marker function.
 313
 314     gdb_run_cmd
 315     set timeout 600
 316     gdb_expect {
 317         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 318             pass "run to marker1 in test_disabling_watchpoints"
 319         }
 320         -re ".*$gdb_prompt $" {
 321             fail "run to marker1 in test_disabling_watchpoints"
 322             return
 323         }
 324         timeout {
 325             fail "run to marker1 in test_disabling_watchpoints (timeout)"
 326             return
 327         }
 328     }
 329
 330     # After reaching the marker function, enable the watchpoint.
 331
 332     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "watchpoint enabled" ] {
 333       return ;
 334     }
 335
 336
 337     # Continue until the first change, from -1 to 0
 338     # Don't check the old value, because on VxWorks the variable value
 339     # will not have been reinitialized.
 340     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, first time"
 341
 342     # Continue until the next change, from 0 to 1.
 343     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"
 344
 345     # Disable the watchpoint but leave breakpoints
 346
 347     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint #2 in test_disabling_watchpoints" ] {
 348       return 0;
 349     }
 350
 351
 352     # Check watchpoint list, looking for the entry that confirms the
 353     # watchpoint is disabled.
 354     gdb_test "info watchpoints" "\[0-9]+\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*" "watchpoint disabled in table"
 355
 356     # Continue until we hit the finishing marker function.
 357     # Make sure we hit no more watchpoints.
 358     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \\(\\).*" \
 359         "disabled watchpoint skipped"
 360
 361     if [target_info exists gdb,noresults] { return }
 362
 363     gdb_continue_to_end "continue to exit in test_disabling_watchpoints"
 364 }
 365
 366 # Test stepping and other mundane operations with watchpoints enabled
 367 proc test_stepping {} {
 368     global gdb_prompt
 369
 370     if [runto marker1] then {
 371         gdb_test "watch ival2" ".*\[Ww\]atchpoint \[0-9\]*: ival2"
 372
 373         # Well, let's not be too mundane.  It should be a *bit* of a challenge
 374         gdb_test "break func2 if 0" "Breakpoint.*at.*"
 375         gdb_test "p \$func2_breakpoint_number = \$bpnum" " = .*"
 376
 377         # The problem is that GDB confuses stepping through the call
 378         # dummy with hitting the breakpoint at the end of the call dummy.
 379         # Will be fixed once all architectures define
 380         # CALL_DUMMY_BREAKPOINT_OFFSET.
 381         setup_xfail "*-*-*"
 382         # This doesn't occur if the call dummy starts with a call,
 383         # because we are out of the dummy by the first time the inferior
 384         # stops.
 385         clear_xfail "arm*-*-*"
 386         clear_xfail "d10v*-*-*"
 387         clear_xfail "m68*-*-*"
 388         clear_xfail "i*86*-*-*"
 389         clear_xfail "vax-*-*"
 390         # The following architectures define CALL_DUMMY_BREAKPOINT_OFFSET.
 391         clear_xfail "alpha-*-*"
 392         clear_xfail "mips*-*-*"
 393         clear_xfail "sparc-*-*"
 394         clear_xfail "hppa*-*-*bsd*"
 395         # It works with the generic inferior function calling code too.
 396         clear_xfail "mn10200*-*-*"
 397         clear_xfail "mn10300*-*-*"
 398         # The following architectures define CALL_DUMMY_HAS_COMPLETED.
 399         clear_xfail "hppa*-*-*hpux*"
 400         gdb_test "p func1 ()" "= 73" \
 401         "calling function with watchpoint enabled"
 402
 403         #
 404         # "finish" brings us back to main.
 405         # On some targets (e.g. alpha) gdb will stop from the finish in midline
 406         # of the marker1 call. This is due to register restoring code on
 407         # the alpha and might be caused by stack adjustment instructions
 408         # on other targets. In this case we will step once more.
 409         #
 410
 411         send_gdb "finish\n"
 412         gdb_expect {
 413             -re "Run.*exit from.*marker1.* at" {
 414                 pass "finish from marker1"
 415             }
 416             default { fail "finish from marker1 (timeout)" ; return }
 417         }
 418
 419         gdb_expect {
 420             -re "marker1 \\(\\);.*$gdb_prompt $" {
 421                 send_gdb "step\n"
 422                 exp_continue
 423             }
 424             -re "func1 \\(\\);.*$gdb_prompt $" {
 425                 pass "back at main from marker1"
 426             }
 427             -re ".*$gdb_prompt $" {
 428                 fail "back at main from marker1"
 429             }
 430             default { fail "back at main from marker1 (timeout)" ; return }
 431         }
 432
 433         gdb_test "next" "for \\(count = 0.*" "next to `for' in watchpoint.exp"
 434
 435         # Now test that "until" works.  It's a bit tricky to test
 436         # "until", because compilers don't always arrange the code
 437         # exactly the same way, and we might get slightly different
 438         # sequences of statements.  But the following should be true
 439         # (if not it is a compiler or a debugger bug): The user who
 440         # does "until" at every statement of a loop should end up
 441         # stepping through the loop once, and the debugger should not
 442         # stop for any of the remaining iterations.
 443
 444         gdb_test "until" "ival1 = count.*" "until to ival1 assignment"
 445         gdb_test "until" "ival3 = count.*" "until to ival3 assignment"
 446         send_gdb "until\n"
 447         gdb_expect {
 448             -re "(for \\(count = 0|\}).*$gdb_prompt $" {
 449                 gdb_test "until" "ival1 = count; /. Outside loop ./" \
 450                     "until out of loop"
 451             }
 452             -re "ival1 = count; /. Outside loop ./.*$gdb_prompt $" {
 453                 pass "until out of loop"
 454             }
 455             -re ".*$gdb_prompt $" {
 456                 fail "until out of loop"
 457             }
 458             default { fail "until out of loop (timeout)" ; return }
 459         }
 460
 461         gdb_test "step" "ival2 = count.*" "step to ival2 assignment"
 462     }
 463 }
 464
 465 # Test stepping and other mundane operations with watchpoints enabled
 466 proc test_watchpoint_triggered_in_syscall {} {
 467     global gdb_prompt
 468
 469     # These tests won't work without printf support.
 470     if [gdb_skip_stdio_test "watchpoints triggered in syscall"] {
 471         return;
 472     }
 473     # Run until we get to the first marker function.
 474     set x 0
 475     set y 0
 476     set testname "Watch buffer passed to read syscall"
 477     if [runto marker2] then {
 478         gdb_test "watch buf\[0\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[0\\\]"
 479         gdb_test "watch buf\[1\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[1\\\]"
 480         gdb_test "watch buf\[2\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[2\\\]"
 481         gdb_test "watch buf\[3\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[3\\\]"
 482         gdb_test "watch buf\[4\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[4\\\]"
 483         gdb_test "break marker4" ".*Breakpoint.*"
 484
 485         gdb_test "set doread = 1" ""
 486
 487         # If we send_gdb "123\n" before gdb has switched the tty, then it goes
 488         # to gdb, not the inferior, and we lose.  So that is why we have
 489         # watchpoint.c prompt us, so we can wait for that prompt.
 490         send_gdb "continue\n";
 491         gdb_expect {
 492             -re "Continuing\\.\r\ntype stuff for buf now:" {
 493                 pass "continue to read"
 494             }
 495             default {
 496                 fail "continue to read";
 497                 return ;
 498             }
 499         }
 500
 501         send_gdb "123\n"
 502         gdb_expect {
 503             -re ".*\[Ww\]atchpoint.*buf\\\[0\\\].*Old value = 0.*New value = 49\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 504             -re ".*\[Ww\]atchpoint.*buf\\\[1\\\].*Old value = 0.*New value = 50\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 505             -re ".*\[Ww\]atchpoint.*buf\\\[2\\\].*Old value = 0.*New value = 51\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 506             -re ".*\[Ww\]atchpoint.*buf\\\[3\\\].*Old value = 0.*New value = 10\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 507             -re ".*$gdb_prompt $" { pass "sent 123" }
 508             timeout { fail "sent 123 (timeout)" }
 509         }
 510
 511         # Examine the values in buf to see how many watchpoints we
 512         # should have printed.
 513         send_gdb "print buf\[0\]\n"
 514         gdb_expect {
 515             -re ".*= 49.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[0\]"}
 516             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[0\]"}
 517             -re ".*$gdb_prompt $" { fail "print buf\[0\]"}
 518             default { fail "print buf\[0\]"}
 519         }
 520         send_gdb "print buf\[1\]\n"
 521         gdb_expect {
 522             -re ".*= 50.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[1\]"}
 523             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[1\]"}
 524             -re ".*$gdb_prompt $" { fail "print buf\[1\]"}
 525             default { fail "print buf\[1\]"}
 526         }
 527         send_gdb "print buf\[2\]\n"
 528         gdb_expect {
 529             -re ".*= 51.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[2\]"}
 530             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[2\]"}
 531             -re ".*$gdb_prompt $" { fail "print buf\[2\]"}
 532             default { fail "print buf\[2\]"}
 533         }
 534         send_gdb "print buf\[3\]\n"
 535         gdb_expect {
 536             -re ".*= 10.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[3\]"}
 537             -re ".*= 0.*$gdb_prompt $" { pass "print buf\[3\]"}
 538             -re ".*$gdb_prompt $" { fail "print buf\[3\]" }
 539             default { fail "print buf\[3\]" }
 540         }
 541
 542         # Did we find what we were looking for?  If not, flunk it.
 543         if [expr $x==$y] then { pass $testname } else { fail "$testname (only triggered $x watchpoints, expected $y)"}
 544
 545         # Continue until we hit the finishing marker function.
 546         # Make sure we hit no more watchpoints.
 547         gdb_test "cont" "Continuing.*Breakpoint.*marker4 \\(\\).*" \
 548             "continue to marker4"
 549
 550         # Disable everything so we can finish the program at full speed
 551         gdb_test "disable" "" "disable in test_watchpoint_triggered_in_syscall"
 552
 553         if [target_info exists gdb,noresults] { return }
 554
 555         gdb_continue_to_end "continue to exit in test_watchpoint_triggered_in_syscall"
 556     }
 557 }
 558
 559 # Do a simple test of of watching through a pointer when the pointer
 560 # itself changes.  Should add some more complicated stuff here.
 561
 562 proc test_complex_watchpoint {} {
 563     global gdb_prompt
 564
 565     if [runto marker4] then {
 566         gdb_test "watch ptr1->val" ".*\[Ww\]atchpoint \[0-9\]*: ptr1->val"
 567         gdb_test "break marker5" ".*Breakpoint.*"
 568
 569         gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ptr1->val.*Old value = 1.*New value = 2.*" "Test complex watchpoint"
 570
 571         # Continue until we hit the marker5 function.
 572         # Make sure we hit no more watchpoints.
 573
 574         gdb_test "cont" "Continuing.*Breakpoint.*marker5 \\(\\).*" \
 575             "did not trigger wrong watchpoint"
 576
 577         # Test watches of things declared locally in a function.
 578         # In particular, test that a watch of stack-based things
 579         # is deleted when the stack-based things go out of scope.
 580         #
 581         gdb_test "disable" "" "disable in test_complex_watchpoint"
 582         gdb_test "break marker6" ".*Breakpoint.*"
 583         gdb_test "cont" "Continuing.*Breakpoint.*marker6 \\(\\).*" \
 584             "continue to marker6"
 585         gdb_test "break func2" ".*Breakpoint.*"
 586         gdb_test "cont" "Continuing.*func2.*"
 587
 588         # Test a watch of a single stack-based variable, whose scope
 589         # is the function we're now in.  This should auto-delete when
 590         # execution exits the scope of the watchpoint.
 591         #
 592         gdb_test "watch local_a" ".*\[Ww\]atchpoint \[0-9\]*: local_a" "set local watch"
 593         gdb_test "cont" "\[Ww\]atchpoint.*local_a.*" "trigger local watch"
 594         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" "self-delete local watch"
 595
 596         gdb_test "cont" "Continuing.*func2.*"
 597         # We should be in "func2" again now.  Test a watch of an
 598         # expression which includes both a stack-based local and
 599         # something whose scope is larger than this invocation
 600         # of "func2".  This should also auto-delete.
 601         #
 602         gdb_test "watch local_a + ival5" ".*\[Ww\]atchpoint \[0-9\]*: local_a . ival5" \
 603                  "set partially local watch"
 604         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
 605                  "trigger1 partially local watch"
 606         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
 607                  "trigger2 partially local watch"
 608         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
 609                  "self-delete partially local watch"
 610
 611         # We should be in "func2" again now.  Test a watch of a
 612         # static (non-stack-based) local.  Since this has scope
 613         # across any invocations of "func2", it should not auto-
 614         # delete.
 615         #
 616         gdb_test "cont" "Continuing.*func2.*"
 617         gdb_test "watch static_b" ".*\[Ww\]atchpoint \[0-9\]*: static_b" \
 618                  "set static local watch"
 619         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: static_b.*" \
 620                  "trigger static local watch"
 621         gdb_test "cont" "Continuing.*marker6 \\(\\).*" \
 622                  "continue after trigger static local watch"
 623         gdb_test "info break" ".*watchpoint.*static_b.*" \
 624                  "static local watch did not self-delete"
 625
 626         # We should be in "recurser" now.  Test a watch of a stack-
 627         # based local.  Symbols mentioned in a watchpoint are bound
 628         # at watchpoint-creation.  Thus, a watch of a stack-based
 629         # local to a recursing function should be bound only to that
 630         # one invocation, and should not trigger for other invocations.
 631         #
 632         gdb_test "tbreak recurser" ".*Breakpoint.*"
 633         gdb_test "cont" "Continuing.*recurser.*"
 634         gdb_test "watch local_x" ".*\[Ww\]atchpoint \[0-9\]*: local_x" \
 635                  "set local watch in recursive call"
 636         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_x.*New value = 2.*" \
 637                  "trigger local watch in recursive call"
 638         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
 639                  "self-delete local watch in recursive call"
 640
 641         # Disable everything so we can finish the program at full speed
 642         gdb_test "disable" "" "disable in test_complex_watchpoint"
 643
 644         if [target_info exists gdb,noresults] { return }
 645
 646         gdb_continue_to_end "continue to exit in test_complex_watchpoint"
 647     }
 648 }
 649
 650 # Start with a fresh gdb.
 651
 652 gdb_exit
 653 gdb_start
 654 gdb_reinitialize_dir $srcdir/$subdir
 655 gdb_load $binfile
 656 set timeout 600
 657 verbose "Timeout now 600 sec.\n"
 658
 659 if [initialize] then {
 660
 661     test_simple_watchpoint
 662
 663     # The IDT/sim monitor only has 8 (!) open files, of which it uses
 664     # 4 (!).  So we have to make sure one program exits before
 665     # starting another one.
 666     if [istarget "mips-idt-*"] then {
 667         gdb_exit
 668         gdb_start
 669         gdb_reinitialize_dir $srcdir/$subdir
 670         gdb_load $binfile
 671         initialize
 672     }
 673
 674     test_disabling_watchpoints
 675
 676     # See above.
 677     if [istarget "mips-idt-*"] then {
 678         gdb_exit
 679         gdb_start
 680         gdb_reinitialize_dir $srcdir/$subdir
 681         gdb_load $binfile
 682         initialize
 683     }
 684
 685     if ![target_info exists gdb,cannot_call_functions] {
 686         test_stepping
 687
 688         # See above.
 689         if [istarget "mips-idt-*"] then {
 690             gdb_exit
 691             gdb_start
 692             gdb_reinitialize_dir $srcdir/$subdir
 693             gdb_load $binfile
 694             initialize
 695         }
 696     }
 697
 698     # Only enabled for some targets merely because it has not been tested
 699     # elsewhere.
 700     # On sparc-sun-sunos4.1.3, GDB was running all the way to the marker4
 701     # breakpoint before stopping for the watchpoint.  I don't know why.
 702     if {[istarget "hppa*-*-*"]} then {
 703         test_watchpoint_triggered_in_syscall
 704     }
 705
 706     # See above.
 707     if [istarget "mips-idt-*"] then {
 708         gdb_exit
 709         gdb_start
 710         gdb_reinitialize_dir $srcdir/$subdir
 711         gdb_load $binfile
 712         initialize
 713     }
 714
 715     # Only enabled for some targets merely because it has not been tested
 716     # elsewhere.
 717     if {[istarget "hppa*-*-*"] || \
 718             [istarget "sparc*-*-sunos*"] || \
 719             [istarget "m32r-*-*"]} then {
 720         test_complex_watchpoint
 721     }
 722
 723     # Verify that a user can force GDB to use "slow" watchpoints.
 724     # (This proves rather little on kernels that don't support
 725     # fast watchpoints, but still...)
 726     #
 727     if ![runto_main] then { fail "watch tests suppressed" }
 728
 729     send_gdb "set can-use-hw-watchpoints 0\n"
 730     gdb_expect {
 731       -re "$gdb_prompt $"\
 732               {pass "disable fast watches"}
 733       timeout {fail "(timeout) disable fast watches"}
 734     }
 735     send_gdb "show can-use-hw-watchpoints\n"
 736     gdb_expect {
 737       -re "Debugger's willingness to use watchpoint hardware is 0.*$gdb_prompt $"\
 738               {pass "show disable fast watches"}
 739       -re "$gdb_prompt $"\
 740               {fail "show disable fast watches"}
 741       timeout {fail "(timeout) show disable fast watches"}
 742     }
 743     send_gdb "watch ival3 if  count > 1\n"
 744     gdb_expect {
 745       -re "Watchpoint \[0-9\]*: ival3.*$gdb_prompt $"\
 746               {pass "set slow conditional watch"}
 747       -re "$gdb_prompt $"\
 748               {fail "set slow conditional watch"}
 749       timeout {fail "(timeout) set slow conditional watch"}
 750     }
 751     send_gdb "continue\n"
 752     gdb_expect {
 753       -re "Watchpoint \[0-9\]*: ival3.*Old value = 1.*New value = 2.*$gdb_prompt $"\
 754               {pass "trigger slow conditional watch"}
 755       -re "$gdb_prompt $"\
 756               {fail "trigger slow conditional watch"}
 757       timeout {fail "(timeout) trigger slow conditional watch"}
 758     }
 759
 760     # We've explicitly disabled hardware watches.  Verify that GDB
 761     #
 762     #
 763     send_gdb "rwatch ival3\n"
 764     gdb_expect {
 765       -re "Expression cannot be implemented with read/access watchpoint..*$gdb_prompt $"\
 766               {pass "rwatch disallowed when can-set-hw-watchpoints cleared"}
 767       -re "$gdb_prompt $"\
 768               {fail "rwatch disallowed when can-set-hw-watchpoints cleared"}
 769       timeout {fail "(timeout) rwatch disallowed when can-use-hw-watchpoints cleared"}
 770     }
 771
 772     # Read- and access watchpoints are unsupported on HP-UX.  Verify
 773     # that GDB gracefully responds to requests to create them.
 774     #
 775     if [istarget "hppa*-*-hpux*"] then {
 776       send_gdb "set can-use-hw-watchpoints 1\n"
 777       gdb_expect {
 778         -re "$gdb_prompt $"\
 779                 {pass "enable fast watches"}
 780         timeout {fail "(timeout) enable fast watches"}
 781       }
 782       send_gdb "rwatch ival3\n"
 783       gdb_expect {
 784         -re "Target does not have this type of hardware watchpoint support.*$gdb_prompt $"\
 785                 {pass "read watches disallowed"}
 786         -re "$gdb_prompt $"\
 787                 {fail "read watches disallowed"}
 788         timeout {fail "(timeout) read watches disallowed"}
 789       }
 790
 791       send_gdb "awatch ival3\n"
 792       gdb_expect {
 793         -re "Target does not have this type of hardware watchpoint support.*$gdb_prompt $"\
 794                 {pass "access watches disallowed"}
 795         -re "$gdb_prompt $"\
 796                 {fail "access watches disallowed"}
 797         timeout {fail "(timeout) access watches disallowed"}
 798       }
 799     }
 800 }