gdb/testsuite/gdb.base/watchpoint.exp

   1 # Copyright 1992, 1994-2000, 2007-2012 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 3 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, see <http://www.gnu.org/licenses/>.
  15
  16 # This file was written by Fred Fish. (fnf@cygnus.com)
  17
  18
  19 set testfile "watchpoint"
  20 set srcfile ${testfile}.c
  21 set binfile ${objdir}/${subdir}/${testfile}
  22
  23 if [get_compiler_info ${binfile}] {
  24     return -1
  25 }
  26
  27 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  28      untested watchpoint.exp
  29      return -1
  30 }
  31
  32 # True if we're forcing no hardware watchpoints.
  33 set no_hw 0
  34
  35 # Prepare for watchpoint tests by setting up two breakpoints and one
  36 # watchpoint.
  37 #
  38 # We use breakpoints at marker functions to get past all the startup code,
  39 # so we can get to the watchpoints in a reasonable amount of time from a
  40 # known starting point.
  41 #
  42 # For simplicity, so we always know how to reference specific breakpoints or
  43 # watchpoints by number, we expect a particular ordering and numbering of
  44 # each in the combined breakpoint/watchpoint table, as follows:
  45 #
  46 #       Number          What            Where
  47 #       1               Breakpoint      marker1()
  48 #       2               Breakpoint      marker2()
  49 #       3               Watchpoint      ival3
  50
  51 proc initialize {} {
  52     global gdb_prompt
  53     global hex
  54     global decimal
  55     global srcfile
  56
  57     # Disable hardware watchpoints if necessary.
  58     if [target_info exists gdb,no_hardware_watchpoints] {
  59         gdb_test_no_output "set can-use-hw-watchpoints 0" ""
  60     }
  61
  62     if [gdb_test "break marker1" "Breakpoint 1 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker1" ] {
  63       return 0;
  64     }
  65
  66
  67     if [gdb_test "break marker2" "Breakpoint 2 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker2" ] {
  68       return 0;
  69     }
  70
  71
  72     if [gdb_test "info break" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*" "info break in watchpoint.exp" ] {
  73       return 0;
  74     }
  75
  76     gdb_test "watch ival3" ".*\[Ww\]atchpoint 3: ival3.*" "set watchpoint on ival3"
  77
  78     if [gdb_test "info watch" "3\[ \]*.*watchpoint.*ival3" "watchpoint found in watchpoint/breakpoint table" ] {
  79       return 0;
  80     }
  81
  82
  83     # After installing the watchpoint, we disable it until we are ready
  84     # to use it.  This allows the test program to run at full speed until
  85     # we get to the first marker function.
  86
  87     if [gdb_test "disable 3" "disable 3\[\r\n\]+" "disable watchpoint" ] {
  88       return 0;
  89     }
  90
  91
  92     return 1
  93 }
  94
  95 proc maybe_clean_restart { } {
  96     # The IDT/sim monitor only has 8 (!) open files, of which it uses
  97     # 4 (!).  So we have to make sure one program exits before
  98     # starting another one.
  99     if [istarget "mips-idt-*"] then {
 100         global testfile
 101         global no_hw
 102
 103         clean_restart $testfile
 104
 105         if {$no_hw} {
 106             gdb_test_no_output "set can-use-hw-watchpoints 0" ""
 107         }
 108     }
 109 }
 110
 111 proc maybe_reinitialize { } {
 112     # The IDT/sim monitor only has 8 (!) open files, of which it uses
 113     # 4 (!).  So we have to make sure one program exits before
 114     # starting another one.
 115     if [istarget "mips-idt-*"] then {
 116         global testfile
 117         global no_hw
 118
 119         clean_restart $testfile
 120
 121         if {$no_hw} {
 122             gdb_test_no_output "set can-use-hw-watchpoints 0" ""
 123         }
 124
 125         initialize
 126     }
 127 }
 128
 129 #
 130 # Test simple watchpoint.
 131 #
 132
 133 proc test_simple_watchpoint {} {
 134     global gdb_prompt
 135     global hex
 136     global decimal
 137
 138     # Ensure that the watchpoint is disabled when we startup.
 139
 140     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_simple_watchpoint" ] {
 141       return 0;
 142     }
 143
 144     # Run until we get to the first marker function.
 145
 146     gdb_run_cmd
 147     set timeout 600
 148     set test "run to marker1 in test_simple_watchpoint"
 149     set retcode [gdb_test_multiple "" $test {
 150         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 151             pass $test
 152         }
 153     }]
 154
 155     if { $retcode != 0 } {
 156         return
 157     }
 158
 159     # After reaching the marker function, enable the watchpoint.
 160
 161     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "enable watchpoint" ] {
 162       return ;
 163     }
 164
 165
 166     gdb_test "break func1" "Breakpoint.*at.*"
 167     gdb_test_no_output "set \$func1_breakpoint_number = \$bpnum"
 168
 169     gdb_test "continue" "Continuing.*Breakpoint \[0-9\]*, func1.*" \
 170         "continue to breakpoint at func1"
 171
 172     # Continue until the first change, from -1 to 0
 173
 174     set test "watchpoint hit, first time"
 175     gdb_test_multiple "cont" $test {
 176         -re "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*$gdb_prompt $" {
 177             pass $test
 178         }
 179         -re "Continuing.*Breakpoint.*func1.*$gdb_prompt $" {
 180             setup_xfail "m68*-*-*" 2597
 181             fail "thought it hit breakpoint at func1 twice"
 182             gdb_test_no_output "delete \$func1_breakpoint_number"
 183             gdb_test "continue" "\
 184 Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count;" \
 185                 $test
 186         }
 187     }
 188
 189     # Check that the hit count is reported correctly
 190     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 1 time.*" "Watchpoint hit count is 1"
 191
 192     gdb_test_no_output "delete \$func1_breakpoint_number"
 193
 194     # Continue until the next change, from 0 to 1.
 195     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit, second time"
 196
 197     # Check that the hit count is reported correctly
 198     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 2 times.*" "Watchpoint hit count is 2"
 199
 200     # Continue until the next change, from 1 to 2.
 201     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*" "watchpoint hit, third time"
 202
 203     # Check that the hit count is reported correctly
 204     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 3 times.*" "Watchpoint hit count is 3"
 205
 206     # Continue until the next change, from 2 to 3.
 207     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*" "watchpoint hit, fourth time"
 208
 209     # Check that the hit count is reported correctly
 210     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 4 times.*" "Watchpoint hit count is 4"
 211
 212     # Continue until the next change, from 3 to 4.
 213     # Note that this one is outside the loop.
 214
 215     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*" "watchpoint hit, fifth time"
 216
 217     # Check that the hit count is reported correctly
 218     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 5 times.*" "Watchpoint hit count is 5"
 219
 220     # Continue until we hit the finishing marker function.
 221     # Make sure we hit no more watchpoints.
 222
 223     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \(\).*" \
 224         "continue to marker2"
 225
 226     # Disable the watchpoint so we run at full speed until we exit.
 227
 228     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "watchpoint disabled" ] {
 229       return ;
 230     }
 231
 232
 233     # Run until process exits.
 234
 235     if [target_info exists gdb,noresults] { return }
 236
 237     gdb_continue_to_end "continue to exit in test_simple_watchpoint"
 238 }
 239
 240 # Test disabling watchpoints.
 241
 242 proc test_disabling_watchpoints {} {
 243     global gdb_prompt
 244     global binfile
 245     global srcfile
 246     global decimal
 247     global hex
 248
 249     maybe_reinitialize
 250
 251     gdb_test "info watch" "\[0-9]+\[ \]*.*watchpoint.*ival3.*" "watchpoints found in watchpoint/breakpoint table"
 252
 253     # Ensure that the watchpoint is disabled when we startup.
 254
 255     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_disabling_watchpoints" ] {
 256       return 0;
 257     }
 258
 259
 260     # Run until we get to the first marker function.
 261
 262     gdb_run_cmd
 263     set timeout 600
 264     set test "run to marker1 in test_disabling_watchpoints"
 265     set retcode [gdb_test_multiple "" $test {
 266         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 267             pass $test
 268         }
 269     }]
 270
 271     if { $retcode != 0 } {
 272         return
 273     }
 274
 275     # After reaching the marker function, enable the watchpoint.
 276
 277     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "watchpoint enabled" ] {
 278       return ;
 279     }
 280
 281
 282     # Continue until the first change, from -1 to 0
 283     # Don't check the old value, because on VxWorks the variable value
 284     # will not have been reinitialized.
 285     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, first time"
 286
 287     # Continue until the next change, from 0 to 1.
 288     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"
 289
 290     # Disable the watchpoint but leave breakpoints
 291
 292     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint #2 in test_disabling_watchpoints" ] {
 293       return 0;
 294     }
 295
 296
 297     # Check watchpoint list, looking for the entry that confirms the
 298     # watchpoint is disabled.
 299     gdb_test "info watchpoints" "\[0-9]+\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*" "watchpoint disabled in table"
 300
 301     # Continue until we hit the finishing marker function.
 302     # Make sure we hit no more watchpoints.
 303     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \\(\\).*" \
 304         "disabled watchpoint skipped"
 305
 306     if [target_info exists gdb,noresults] { return }
 307
 308     gdb_continue_to_end "continue to exit in test_disabling_watchpoints"
 309 }
 310
 311 # Test stepping and other mundane operations with watchpoints enabled
 312 proc test_stepping {} {
 313     global gdb_prompt
 314
 315     maybe_clean_restart
 316
 317     if [runto marker1] then {
 318         gdb_test "watch ival2" ".*\[Ww\]atchpoint \[0-9\]*: ival2"
 319
 320         # Well, let's not be too mundane.  It should be a *bit* of a challenge
 321         gdb_test "break func2 if 0" "Breakpoint.*at.*"
 322         gdb_test "p \$func2_breakpoint_number = \$bpnum" " = .*"
 323
 324         gdb_test "p func1 ()" "= 73" \
 325             "calling function with watchpoint enabled"
 326
 327         #
 328         # "finish" brings us back to main.
 329         # On some targets (e.g. alpha) gdb will stop from the finish in midline
 330         # of the marker1 call. This is due to register restoring code on
 331         # the alpha and might be caused by stack adjustment instructions
 332         # on other targets. In this case we will step once more.
 333         #
 334
 335         send_gdb "finish\n"
 336         gdb_expect {
 337             -re "Run.*exit from.*marker1.* at" {
 338                 pass "finish from marker1"
 339             }
 340             default { fail "finish from marker1 (timeout)" ; return }
 341         }
 342
 343         gdb_expect {
 344             -re "marker1 \\(\\);.*$gdb_prompt $" {
 345                 send_gdb "step\n"
 346                 exp_continue
 347             }
 348             -re "func1 \\(\\);.*$gdb_prompt $" {
 349                 pass "back at main from marker1"
 350             }
 351             -re ".*$gdb_prompt $" {
 352                 fail "back at main from marker1"
 353             }
 354             default { fail "back at main from marker1 (timeout)" ; return }
 355         }
 356
 357         gdb_test "next" "for \\(count = 0.*" "next to `for' in watchpoint.exp"
 358
 359         # Now test that "until" works.  It's a bit tricky to test
 360         # "until", because compilers don't always arrange the code
 361         # exactly the same way, and we might get slightly different
 362         # sequences of statements.  But the following should be true
 363         # (if not it is a compiler or a debugger bug): The user who
 364         # does "until" at every statement of a loop should end up
 365         # stepping through the loop once, and the debugger should not
 366         # stop for any of the remaining iterations.
 367
 368         gdb_test "until" "ival1 = count.*" "until to ival1 assignment"
 369         gdb_test "until" "ival3 = count.*" "until to ival3 assignment"
 370         set test "until out of loop"
 371         gdb_test_multiple "until" $test {
 372             -re "(for \\(count = 0|\}).*$gdb_prompt $" {
 373                 gdb_test "until" "ival1 = count; /. Outside loop ./" $test
 374             }
 375             -re "ival1 = count; /. Outside loop ./.*$gdb_prompt $" {
 376                 pass $test
 377             }
 378         }
 379
 380         gdb_test "step" "ival2 = count.*" "step to ival2 assignment"
 381     }
 382 }
 383
 384 # Test stepping and other mundane operations with watchpoints enabled
 385 proc test_watchpoint_triggered_in_syscall {} {
 386     global gdb_prompt
 387
 388     # These tests won't work without printf support.
 389     if [gdb_skip_stdio_test "watchpoints triggered in syscall"] {
 390         return;
 391     }
 392     # Run until we get to the first marker function.
 393     set x 0
 394     set y 0
 395     set testname "Watch buffer passed to read syscall"
 396     if [runto marker2] then {
 397         gdb_test "watch buf\[0\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[0\\\]"
 398         gdb_test "watch buf\[1\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[1\\\]"
 399         gdb_test "watch buf\[2\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[2\\\]"
 400         gdb_test "watch buf\[3\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[3\\\]"
 401         gdb_test "watch buf\[4\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[4\\\]"
 402         gdb_test "break marker4" ".*Breakpoint.*"
 403
 404         gdb_test_no_output "set doread = 1"
 405
 406         # If we send gdb "123\n" before gdb has switched the tty, then it goes
 407         # to gdb, not the inferior, and we lose.  So that is why we have
 408         # watchpoint.c prompt us, so we can wait for that prompt.
 409
 410         send_gdb "continue\n";
 411         gdb_expect {
 412             -re "Continuing\\.\r\ntype stuff for buf now:" {
 413                 pass "continue to read"
 414             }
 415             default {
 416                 fail "continue to read";
 417                 return ;
 418             }
 419         }
 420
 421         set test "sent 123"
 422         gdb_test_multiple "123" $test {
 423             -re ".*\[Ww\]atchpoint.*buf\\\[0\\\].*Old value = 0.*New value = 49\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 424             -re ".*\[Ww\]atchpoint.*buf\\\[1\\\].*Old value = 0.*New value = 50\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 425             -re ".*\[Ww\]atchpoint.*buf\\\[2\\\].*Old value = 0.*New value = 51\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 426             -re ".*\[Ww\]atchpoint.*buf\\\[3\\\].*Old value = 0.*New value = 10\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 427             -re ".*$gdb_prompt $" { pass $test }
 428         }
 429
 430         # Examine the values in buf to see how many watchpoints we
 431         # should have printed.
 432         set test "print buf\[0\]"
 433         gdb_test_multiple $test $test {
 434             -re ".*= 49.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 435             -re ".*= 0.*$gdb_prompt $" { $test }
 436         }
 437         set test "print buf\[1\]"
 438         gdb_test_multiple $test $test {
 439             -re ".*= 50.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 440             -re ".*= 0.*$gdb_prompt $" { pass $test }
 441         }
 442         set test "print buf\[2\]"
 443         gdb_test_multiple $test $test {
 444             -re ".*= 51.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 445             -re ".*= 0.*$gdb_prompt $" { pass $test }
 446         }
 447         set test "print buf\[3\]"
 448         gdb_test_multiple $test $test {
 449             -re ".*= 10.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 450             -re ".*= 0.*$gdb_prompt $" { pass $test }
 451         }
 452
 453         # Did we find what we were looking for?  If not, flunk it.
 454         if [expr $x==$y] then { pass $testname } else { fail "$testname (only triggered $x watchpoints, expected $y)"}
 455
 456         # Continue until we hit the finishing marker function.
 457         # Make sure we hit no more watchpoints.
 458         gdb_test "cont" "Continuing.*Breakpoint.*marker4 \\(\\).*" \
 459             "continue to marker4"
 460
 461         # Disable everything so we can finish the program at full speed
 462         gdb_test_no_output "disable" "disable in test_watchpoint_triggered_in_syscall"
 463
 464         if [target_info exists gdb,noresults] { return }
 465
 466         gdb_continue_to_end "continue to exit in test_watchpoint_triggered_in_syscall"
 467     }
 468 }
 469
 470 # Do a simple test of of watching through a pointer when the pointer
 471 # itself changes.  Should add some more complicated stuff here.
 472
 473 proc test_complex_watchpoint {} {
 474     global gdb_prompt
 475
 476     maybe_clean_restart
 477
 478     if [runto marker4] then {
 479         gdb_test "watch ptr1->val" ".*\[Ww\]atchpoint \[0-9\]*: ptr1->val"
 480         gdb_test "break marker5" ".*Breakpoint.*"
 481
 482         gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ptr1->val.*Old value = 1.*New value = 2.*" "Test complex watchpoint"
 483
 484         # Continue until we hit the marker5 function.
 485         # Make sure we hit no more watchpoints.
 486
 487         gdb_test "cont" "Continuing.*Breakpoint.*marker5 \\(\\).*" \
 488             "did not trigger wrong watchpoint"
 489
 490         # Test watches of things declared locally in a function.
 491         # In particular, test that a watch of stack-based things
 492         # is deleted when the stack-based things go out of scope.
 493         #
 494         gdb_test_no_output "disable" "disable in test_complex_watchpoint"
 495         gdb_test "break marker6" ".*Breakpoint.*"
 496         gdb_test "cont" "Continuing.*Breakpoint.*marker6 \\(\\).*" \
 497             "continue to marker6"
 498         gdb_test "break func2" ".*Breakpoint.*"
 499         gdb_test "cont" "Continuing.*func2.*"
 500
 501         # Test a watch of a single stack-based variable, whose scope
 502         # is the function we're now in.  This should auto-delete when
 503         # execution exits the scope of the watchpoint.
 504         #
 505         gdb_test "watch local_a" ".*\[Ww\]atchpoint \[0-9\]*: local_a" "set local watch"
 506         gdb_test "cont" "\[Ww\]atchpoint.*local_a.*" "trigger local watch"
 507         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" "self-delete local watch"
 508
 509         gdb_test "cont" "Continuing.*func2.*"
 510         # We should be in "func2" again now.  Test a watch of an
 511         # expression which includes both a stack-based local and
 512         # something whose scope is larger than this invocation
 513         # of "func2".  This should also auto-delete.
 514         #
 515         gdb_test "watch local_a + ival5" ".*\[Ww\]atchpoint \[0-9\]*: local_a . ival5" \
 516                  "set partially local watch"
 517         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
 518                  "trigger1 partially local watch"
 519         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
 520                  "trigger2 partially local watch"
 521         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
 522                  "self-delete partially local watch"
 523
 524         # We should be in "func2" again now.  Test a watch of a
 525         # static (non-stack-based) local.  Since this has scope
 526         # across any invocations of "func2", it should not auto-
 527         # delete.
 528         #
 529         gdb_test "cont" "Continuing.*func2.*"
 530         gdb_test "watch static_b" ".*\[Ww\]atchpoint \[0-9\]*: static_b" \
 531                  "set static local watch"
 532         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: static_b.*" \
 533                  "trigger static local watch"
 534         gdb_test "cont" "Continuing.*marker6 \\(\\).*" \
 535                  "continue after trigger static local watch"
 536         gdb_test "info break" ".*watchpoint.*static_b.*" \
 537                  "static local watch did not self-delete"
 538
 539         # We should be in "recurser" now.  Test a watch of a stack-
 540         # based local.  Symbols mentioned in a watchpoint are bound
 541         # at watchpoint-creation.  Thus, a watch of a stack-based
 542         # local to a recursing function should be bound only to that
 543         # one invocation, and should not trigger for other invocations.
 544         #
 545         gdb_test "tbreak recurser" ".*breakpoint.*"
 546         gdb_test "cont" "Continuing.*recurser.*"
 547         gdb_test "next" "if \\(x > 0.*" "next past local_x initialization"
 548         gdb_test "watch local_x" ".*\[Ww\]atchpoint \[0-9\]*: local_x" \
 549                  "set local watch in recursive call"
 550         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_x.*New value = 2.*" \
 551                  "trigger local watch in recursive call"
 552         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
 553                  "self-delete local watch in recursive call"
 554
 555         # Repeat the preceding test, but this time use "recurser::local_x" as
 556         # the variable to track.
 557         gdb_test "cont" "Continuing.*marker6.*"
 558         gdb_test "tbreak recurser" ".*breakpoint.*"
 559         gdb_test "cont" "Continuing.*recurser.*"
 560         gdb_test "next" "if \\(x > 0.*" "next past local_x initialization"
 561         gdb_test "watch recurser::local_x" ".*\[Ww\]atchpoint \[0-9\]*: recurser::local_x" \
 562                  "set local watch in recursive call with explicit scope"
 563         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: recurser::local_x.*New value = 2.*" \
 564                  "trigger local watch with explicit scope in recursive call"
 565         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
 566                  "self-delete local watch with explicit scope in recursive call (2)"
 567
 568         # Disable everything so we can finish the program at full speed
 569         gdb_test_no_output "disable" "disable in test_complex_watchpoint"
 570
 571         if [target_info exists gdb,noresults] { return }
 572
 573         gdb_continue_to_end "continue to exit in test_complex_watchpoint"
 574     }
 575 }
 576
 577 proc test_watchpoint_and_breakpoint {} {
 578     global gdb_prompt
 579
 580     maybe_clean_restart
 581
 582     # This is a test for PR gdb/38, which involves setting a
 583     # watchpoint right after you've reached a breakpoint.
 584
 585     if [runto func3] then {
 586         gdb_breakpoint [gdb_get_line_number "second x assignment"]
 587         gdb_continue_to_breakpoint "second x assignment"
 588         gdb_test "watch x" ".*atchpoint \[0-9\]+: x"
 589         gdb_test_multiple "next" "next after watch x" {
 590             -re ".*atchpoint \[0-9\]+: x\r\n\r\nOld value = 0\r\nNew value = 1\r\n.*$gdb_prompt $" {
 591                 pass "next after watch x"
 592             }
 593             -re "\[0-9\]+\[\t \]+y = 1;\r\n$gdb_prompt $" {
 594                 kfail "gdb/38" "next after watch x"
 595             }
 596         }
 597
 598         gdb_test_no_output "delete \$bpnum" "delete watch x"
 599     }
 600 }
 601
 602 proc test_constant_watchpoint {} {
 603     gdb_test "watch 5" "Cannot watch constant value `5'." "number is constant"
 604     gdb_test "watch marker1" "Cannot watch constant value `marker1'." \
 605     "marker1 is constant"
 606     gdb_test "watch count + 6" ".*atchpoint \[0-9\]+: count \\+ 6"
 607     gdb_test_no_output "delete \$bpnum" "delete watchpoint `count + 6'"
 608     gdb_test "watch 7 + count" ".*atchpoint \[0-9\]+: 7 \\+ count"
 609     gdb_test_no_output "delete \$bpnum" "delete watchpoint `7 + count'"
 610 }
 611
 612 proc test_disable_enable_software_watchpoint {} {
 613     # This is regression test for a bug that caused `enable' to fail
 614     # for software watchpoints.
 615
 616     # Watch something not memory to force a software watchpoint.
 617     gdb_test {watch $pc} ".*atchpoint \[0-9\]+: .pc"
 618
 619     gdb_test_no_output "disable \$bpnum" "disable watchpoint `\$pc'"
 620     gdb_test_no_output "enable \$bpnum" "reenable watchpoint `\$pc'"
 621
 622     gdb_test "info watchpoint \$bpnum" \
 623         ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+.pc.*" \
 624         "watchpoint `\$pc' is enabled"
 625
 626     gdb_test_no_output "delete \$bpnum" "delete watchpoint `\$pc'"
 627 }
 628
 629 proc test_watch_location {} {
 630     gdb_breakpoint [gdb_get_line_number "func5 breakpoint here"]
 631     gdb_continue_to_breakpoint "func5 breakpoint here"
 632
 633     gdb_test "watch -location *x" "atchpoint .*: .*" "watch -location .x"
 634
 635     gdb_test "continue" \
 636         "Continuing.*\[Ww\]atchpoint .*: .*New value = 27.*" \
 637         "continue with watch -location"
 638
 639     gdb_test_no_output "delete \$bpnum" "delete watch -location"
 640 }
 641
 642 # Tests watching areas larger than a word.
 643
 644 proc test_wide_location_1 {} {
 645     global no_hw
 646
 647     # This test watches two words on most 32-bit ABIs, and one word on
 648     # most 64-bit ABIs.
 649
 650     # Platforms where the target can't watch such a large region
 651     # should clear hw_expected below.
 652     if { $no_hw || [target_info exists gdb,no_hardware_watchpoints] } {
 653         set hw_expected 0
 654     } else {
 655         set hw_expected 1
 656     }
 657
 658     gdb_breakpoint [gdb_get_line_number "func6 breakpoint here"]
 659     gdb_continue_to_breakpoint "func6 breakpoint here"
 660
 661     if { $hw_expected } {
 662         gdb_test "watch foo2" "Hardware watchpoint .*: .*" "watch foo2"
 663         gdb_test "continue" \
 664             "Continuing.*Hardware watchpoint .*: .*New value = \\\{val = \\\{0, 11\\\}\\\}.*" \
 665             "continue with watch foo2"
 666     } else {
 667         gdb_test "watch foo2" "atchpoint .*: .*" "watch foo2"
 668         gdb_test "continue" \
 669             "Continuing.*\[Ww\]atchpoint .*: .*New value = \\\{val = \\\{0, 11\\\}\\\}.*" \
 670             "continue with watch foo2"
 671     }
 672
 673     gdb_test_no_output "delete \$bpnum" "delete watch foo2"
 674 }
 675
 676 proc test_wide_location_2 {} {
 677     global no_hw
 678
 679     # This test watches four words on most 32-bit ABIs, and two words
 680     # on 64-bit ABIs.
 681
 682     # Platforms where the target can't watch such a large region
 683     # should clear hw_expected below.
 684     if { $no_hw || [target_info exists gdb,no_hardware_watchpoints] } {
 685         set hw_expected 0
 686     } else {
 687         set hw_expected 1
 688     }
 689
 690     gdb_breakpoint [gdb_get_line_number "func7 breakpoint here"]
 691     gdb_continue_to_breakpoint "func7 breakpoint here"
 692
 693     if { $hw_expected } {
 694         gdb_test "watch foo4" "Hardware watchpoint .*: .*" "watch foo4"
 695         gdb_test "continue" \
 696             "Continuing.*Hardware watchpoint .*: .*New value = \\\{val = \\\{0, 0, 0, 33\\\}\\\}.*" \
 697             "continue with watch foo4"
 698     } else {
 699         gdb_test "watch foo4" "atchpoint .*: .*" "watch foo4"
 700         gdb_test "continue" \
 701             "Continuing.*\[Ww\]atchpoint .*: .*New value = \\\{val = \\\{0, 0, 0, 33\\\}\\\}.*" \
 702             "continue with watch foo4"
 703     }
 704
 705     gdb_test_no_output "delete \$bpnum" "delete watch foo4"
 706 }
 707
 708 proc test_inaccessible_watchpoint {} {
 709     global gdb_prompt
 710
 711     maybe_clean_restart
 712
 713     # This is a test for watchpoints on currently inaccessible (but later
 714     # valid) memory.
 715
 716     if [runto func4] then {
 717         # Make sure we only allow memory access errors.
 718         set msg "watchpoint refused to insert on nonexistent struct member"
 719         gdb_test_multiple "watch struct1.nosuchmember" $msg {
 720             -re ".*atchpoint \[0-9\]+: struct1.nosuchmember.*$gdb_prompt $" {
 721                 # PR breakpoints/9681
 722                 fail $msg
 723             }
 724             -re "There is no member named nosuchmember\\..*$gdb_prompt $" {
 725                 pass $msg
 726             }
 727         }
 728
 729         # See whether a watchpoint on a normal variable is a hardware
 730         # watchpoint or not.  The watchpoints on NULL should be hardware
 731         # iff this one is.
 732         set watchpoint_msg "Watchpoint"
 733         gdb_test_multiple "watch global_ptr" "watch global_ptr" {
 734             -re "Watchpoint \[0-9\]+: global_ptr\r\n.*$gdb_prompt $" {
 735                 pass "watch global_ptr"
 736             }
 737             -re "Hardware watchpoint \[0-9\]+: global_ptr\r\n.*$gdb_prompt $" {
 738                 set watchpoint_msg "Hardware watchpoint"
 739                 pass "watch global_ptr"
 740             }
 741         }
 742         delete_breakpoints
 743
 744         # Make sure that we can watch a constant address, and correctly
 745         # use a HW watchpoint if supported.
 746         gdb_test "watch *(int *) 0" \
 747             "$watchpoint_msg \[0-9\]+: \\*\\(int \\*\\) 0"
 748         delete_breakpoints
 749
 750         # The same, but using -location through an indirection.
 751         gdb_test "watch -location *global_ptr" \
 752             "$watchpoint_msg \[0-9\]+: \-location \\*global_ptr"
 753         delete_breakpoints
 754
 755         # This step requires two HW watchpoints.  Since some platforms only
 756         # have a single one, accept either SW or HW watchpoint in this case.
 757         if {[skip_hw_watchpoint_multi_tests]} {
 758             set watchpoint_msg "(Watchpoint|Hardware watchpoint)"
 759         }
 760
 761         gdb_test "watch *global_ptr" "$watchpoint_msg \[0-9\]+: \\\*global_ptr"
 762         gdb_test "set \$global_ptr_breakpoint_number = \$bpnum" ""
 763         gdb_test "next" ".*global_ptr = buf.*" "global_ptr next"
 764         gdb_test_multiple "next" "next over ptr init" {
 765             -re ".*atchpoint \[0-9\]+: \\*global_ptr\r\n\r\nOld value = .*\r\nNew value = 3 .*\r\n.*$gdb_prompt $" {
 766                 # We can not test for <unknown> here because NULL may be readable.
 767                 # This test does rely on *NULL != 3.
 768                 pass "next over ptr init"
 769             }
 770         }
 771         gdb_test_multiple "next" "next over buffer set" {
 772             -re ".*atchpoint \[0-9\]+: \\*global_ptr\r\n\r\nOld value = 3 .*\r\nNew value = 7 .*\r\n.*$gdb_prompt $" {
 773                 pass "next over buffer set"
 774             }
 775         }
 776         gdb_test "delete \$global_ptr_breakpoint_number" ""
 777         gdb_test "watch **global_ptr_ptr" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr"
 778         gdb_test "set \$global_ptr_ptr_breakpoint_number = \$bpnum" ""
 779         gdb_test "next" ".*global_ptr_ptr = &global_ptr.*" "global_ptr_ptr next"
 780         gdb_test "next" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr\[\r\n\]+Old value = .*\r\nNew value = 7 .*" "next over global_ptr_ptr init"
 781         gdb_test "next" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr\[\r\n\]+Old value = 7 .*\r\nNew value = 9 .*" "next over global_ptr_ptr buffer set"
 782         gdb_test "next" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr\[\r\n\]+Old value = 9 .*\r\nNew value = 5 .*" "next over global_ptr_ptr pointer advance"
 783         gdb_test_no_output "delete \$global_ptr_ptr_breakpoint_number"
 784     }
 785 }
 786
 787 proc test_no_hw_watchpoints {} {
 788     global testfile
 789
 790     clean_restart $testfile
 791
 792     # Verify that a user can force GDB to use "slow" watchpoints.
 793     # (This proves rather little on kernels that don't support
 794     # fast watchpoints, but still...)
 795     #
 796     if ![runto_main] then { fail "watch tests suppressed" }
 797
 798     gdb_test_no_output "set can-use-hw-watchpoints 0" "disable fast watches"
 799
 800     gdb_test "show can-use-hw-watchpoints" \
 801         "Debugger's willingness to use watchpoint hardware is 0." \
 802         "show disable fast watches"
 803
 804     gdb_test "watch ival3 if  count > 1" \
 805         "Watchpoint \[0-9\]*: ival3.*" \
 806         "set slow conditional watch"
 807
 808     gdb_test "continue" \
 809         "Watchpoint \[0-9\]*: ival3.*Old value = 1.*New value = 2.*" \
 810         "trigger slow conditional watch"
 811
 812     gdb_test_no_output "delete \$bpnum" "delete watch ival3"
 813
 814     # We've explicitly disabled hardware watches.  Verify that GDB
 815     # refrains from using them.
 816     #
 817     gdb_test "rwatch ival3" \
 818         "Expression cannot be implemented with read/access watchpoint..*" \
 819         "rwatch disallowed when can-set-hw-watchpoints cleared"
 820
 821     # Re-enable hardware watchpoints if necessary.
 822     if ![target_info exists gdb,no_hardware_watchpoints] {
 823         gdb_test_no_output "set can-use-hw-watchpoints 1" ""
 824     }
 825 }
 826
 827 proc test_watchpoint_in_big_blob {} {
 828     global gdb_prompt
 829
 830     # On native targets where we do hardware resource accounting, this
 831     # may end up as a software watchpoint.
 832     set ok 0
 833     set test "watch buf"
 834     gdb_test_multiple "watch buf" $test {
 835         -re "Hardware watchpoint \[0-9\]+: buf.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
 836             # This may happen with remote targets (where we don't do
 837             # resource accounting) that support hardware watchpoints,
 838             # when breakpoint always-inserted is on.  The watchpoint
 839             # was too large, for example.  If GDB is ever adjusted to
 840             # downgrade the watchpoint automatically in this case,
 841             # this match should be removed.  Note the breakpoint has
 842             # been created, and is in the list, so it needs deleting.
 843             pass $test
 844         }
 845         -re ".*atchpoint \[0-9\]+: buf.*$gdb_prompt $" {
 846             pass $test
 847             set ok 1
 848         }
 849     }
 850
 851     if { $ok } {
 852         set test "watchpoint on buf hit"
 853         gdb_test_multiple "cont" $test {
 854             -re "Continuing.*atchpoint \[0-9\]+: buf\r\n\r\nOld value = .*testte\".*$gdb_prompt $" {
 855                 pass $test
 856             }
 857             -re "Could not insert hardware breakpoints:.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
 858                 # This may happen with remote targets that support
 859                 # hardware watchpoints.  We only find out the
 860                 # watchpoint was too large, for example, at insert
 861                 # time.  If GDB is ever adjusted to downgrade the
 862                 # watchpoint automatically in this case, this match
 863                 # should be removed.
 864                 pass $test
 865             }
 866         }
 867     }
 868
 869     gdb_test_no_output "delete \$bpnum" "delete watch buf"
 870 }
 871
 872 # Start with a fresh gdb.
 873
 874 set prev_timeout $timeout
 875 set timeout 600
 876 verbose "Timeout now 600 sec.\n"
 877
 878 test_no_hw_watchpoints
 879
 880 proc do_tests {} {
 881     global testfile
 882     global no_hw
 883
 884     clean_restart $testfile
 885
 886     if {$no_hw} {
 887         gdb_test_no_output "set can-use-hw-watchpoints 0" ""
 888     }
 889
 890     if [initialize] then {
 891
 892         test_simple_watchpoint
 893
 894         test_disabling_watchpoints
 895
 896         if ![target_info exists gdb,cannot_call_functions] {
 897             test_stepping
 898         }
 899     }
 900
 901     # Tests below don't rely on the markers and watchpoint set by
 902     # `initialize' anymore.
 903     clean_restart $testfile
 904
 905     if {$no_hw} {
 906         gdb_test_no_output "set can-use-hw-watchpoints 0" ""
 907     }
 908
 909     # Only enabled for some targets merely because it has not been tested
 910     # elsewhere.
 911     # On sparc-sun-sunos4.1.3, GDB was running all the way to the marker4
 912     # breakpoint before stopping for the watchpoint.  I don't know why.
 913     if {[istarget "hppa*-*-*"]} then {
 914         test_watchpoint_triggered_in_syscall
 915     }
 916
 917     test_complex_watchpoint
 918
 919     test_inaccessible_watchpoint
 920
 921     test_watchpoint_and_breakpoint
 922
 923     test_watchpoint_in_big_blob
 924
 925     test_constant_watchpoint
 926
 927     test_disable_enable_software_watchpoint
 928
 929     test_watch_location
 930
 931     test_wide_location_1
 932     test_wide_location_2
 933 }
 934
 935 # On targets that can do hardware watchpoints, run the tests twice:
 936 # once with hardware watchpoints enabled; another with hardware
 937 # watchpoints force-disabled.
 938
 939 do_tests
 940 if ![target_info exists gdb,no_hardware_watchpoints] {
 941     set save_pf_prefix $pf_prefix
 942     lappend pf_prefix "no-hw:"
 943
 944     set no_hw 1
 945     do_tests
 946     set pf_prefix $save_pf_prefix
 947 }
 948
 949 # Restore old timeout
 950 set timeout $prev_timeout
 951 verbose "Timeout now $timeout sec.\n"