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