gdb/testsuite/gdb.base/watchpoint.exp

   1 # Copyright 1992-2013 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}/${testfile}
  22
  23 if [get_compiler_info] {
  24     return -1
  25 }
  26
  27 if  { [gdb_compile "${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     if [gdb_test "break marker1" "Breakpoint 1 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker1" ] {
  58       return 0;
  59     }
  60
  61
  62     if [gdb_test "break marker2" "Breakpoint 2 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker2" ] {
  63       return 0;
  64     }
  65
  66
  67     if [gdb_test "info break" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*" "info break in watchpoint.exp" ] {
  68       return 0;
  69     }
  70
  71     gdb_test "watch ival3" ".*\[Ww\]atchpoint 3: ival3.*" "set watchpoint on ival3"
  72
  73     if [gdb_test "info watch" "3\[ \]*.*watchpoint.*ival3" "watchpoint found in watchpoint/breakpoint table" ] {
  74       return 0;
  75     }
  76
  77
  78     # After installing the watchpoint, we disable it until we are ready
  79     # to use it.  This allows the test program to run at full speed until
  80     # we get to the first marker function.
  81
  82     if [gdb_test "disable 3" "disable 3\[\r\n\]+" "disable watchpoint" ] {
  83       return 0;
  84     }
  85
  86
  87     return 1
  88 }
  89
  90 #
  91 # Test simple watchpoint.
  92 #
  93
  94 proc test_simple_watchpoint {} {
  95     global gdb_prompt
  96     global hex
  97     global decimal
  98
  99     # Ensure that the watchpoint is disabled when we startup.
 100
 101     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_simple_watchpoint" ] {
 102       return 0;
 103     }
 104
 105     # Run until we get to the first marker function.
 106
 107     gdb_run_cmd
 108     set timeout 600
 109     set test "run to marker1 in test_simple_watchpoint"
 110     set retcode [gdb_test_multiple "" $test {
 111         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 112             pass $test
 113         }
 114     }]
 115
 116     if { $retcode != 0 } {
 117         return
 118     }
 119
 120     # After reaching the marker function, enable the watchpoint.
 121
 122     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "enable watchpoint" ] {
 123       return ;
 124     }
 125
 126
 127     gdb_test "break func1" "Breakpoint.*at.*"
 128     gdb_test_no_output "set \$func1_breakpoint_number = \$bpnum"
 129
 130     gdb_test "continue" "Continuing.*Breakpoint \[0-9\]*, func1.*" \
 131         "continue to breakpoint at func1"
 132
 133     # Continue until the first change, from -1 to 0
 134
 135     set test "watchpoint hit, first time"
 136     gdb_test_multiple "cont" $test {
 137         -re "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*$gdb_prompt $" {
 138             pass $test
 139         }
 140         -re "Continuing.*Breakpoint.*func1.*$gdb_prompt $" {
 141             setup_xfail "m68*-*-*" 2597
 142             fail "thought it hit breakpoint at func1 twice"
 143             gdb_test_no_output "delete \$func1_breakpoint_number"
 144             gdb_test "continue" "\
 145 Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count;" \
 146                 $test
 147         }
 148     }
 149
 150     # Check that the hit count is reported correctly
 151     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 1 time.*" "Watchpoint hit count is 1"
 152
 153     gdb_test_no_output "delete \$func1_breakpoint_number"
 154
 155     # Continue until the next change, from 0 to 1.
 156     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit, second time"
 157
 158     # Check that the hit count is reported correctly
 159     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 2 times.*" "Watchpoint hit count is 2"
 160
 161     # Continue until the next change, from 1 to 2.
 162     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*" "watchpoint hit, third time"
 163
 164     # Check that the hit count is reported correctly
 165     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 3 times.*" "Watchpoint hit count is 3"
 166
 167     # Continue until the next change, from 2 to 3.
 168     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*" "watchpoint hit, fourth time"
 169
 170     # Check that the hit count is reported correctly
 171     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 4 times.*" "Watchpoint hit count is 4"
 172
 173     # Continue until the next change, from 3 to 4.
 174     # Note that this one is outside the loop.
 175
 176     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*" "watchpoint hit, fifth time"
 177
 178     # Check that the hit count is reported correctly
 179     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 5 times.*" "Watchpoint hit count is 5"
 180
 181     # Continue until we hit the finishing marker function.
 182     # Make sure we hit no more watchpoints.
 183
 184     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \(\).*" \
 185         "continue to marker2"
 186
 187     # Disable the watchpoint so we run at full speed until we exit.
 188
 189     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "watchpoint disabled" ] {
 190       return ;
 191     }
 192
 193
 194     # Run until process exits.
 195
 196     if [target_info exists gdb,noresults] { return }
 197
 198     gdb_continue_to_end "continue to exit in test_simple_watchpoint"
 199 }
 200
 201 # Test disabling watchpoints.
 202
 203 proc test_disabling_watchpoints {} {
 204     global gdb_prompt
 205     global binfile
 206     global srcfile
 207     global decimal
 208     global hex
 209
 210     gdb_test "info watch" "\[0-9]+\[ \]*.*watchpoint.*ival3.*" "watchpoints found in watchpoint/breakpoint table"
 211
 212     # Ensure that the watchpoint is disabled when we startup.
 213
 214     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_disabling_watchpoints" ] {
 215       return 0;
 216     }
 217
 218
 219     # Run until we get to the first marker function.
 220
 221     gdb_run_cmd
 222     set timeout 600
 223     set test "run to marker1 in test_disabling_watchpoints"
 224     set retcode [gdb_test_multiple "" $test {
 225         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 226             pass $test
 227         }
 228     }]
 229
 230     if { $retcode != 0 } {
 231         return
 232     }
 233
 234     # After reaching the marker function, enable the watchpoint.
 235
 236     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "watchpoint enabled" ] {
 237       return ;
 238     }
 239
 240
 241     # Continue until the first change, from -1 to 0
 242     # Don't check the old value, because on VxWorks the variable value
 243     # will not have been reinitialized.
 244     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, first time"
 245
 246     # Continue until the next change, from 0 to 1.
 247     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"
 248
 249     # Disable the watchpoint but leave breakpoints
 250
 251     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint #2 in test_disabling_watchpoints" ] {
 252       return 0;
 253     }
 254
 255
 256     # Check watchpoint list, looking for the entry that confirms the
 257     # watchpoint is disabled.
 258     gdb_test "info watchpoints" "\[0-9]+\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*" "watchpoint disabled in table"
 259
 260     # Continue until we hit the finishing marker function.
 261     # Make sure we hit no more watchpoints.
 262     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \\(\\).*" \
 263         "disabled watchpoint skipped"
 264
 265     if [target_info exists gdb,noresults] { return }
 266
 267     gdb_continue_to_end "continue to exit in test_disabling_watchpoints"
 268 }
 269
 270 # Test stepping and other mundane operations with watchpoints enabled
 271 proc test_stepping {} {
 272     global gdb_prompt
 273
 274     if [runto marker1] then {
 275         gdb_test "watch ival2" ".*\[Ww\]atchpoint \[0-9\]*: ival2"
 276
 277         # Well, let's not be too mundane.  It should be a *bit* of a challenge
 278         gdb_test "break func2 if 0" "Breakpoint.*at.*"
 279         gdb_test "p \$func2_breakpoint_number = \$bpnum" " = .*"
 280
 281         gdb_test "p func1 ()" "= 73" \
 282             "calling function with watchpoint enabled"
 283
 284         #
 285         # "finish" brings us back to main.
 286         # On some targets (e.g. alpha) gdb will stop from the finish in midline
 287         # of the marker1 call. This is due to register restoring code on
 288         # the alpha and might be caused by stack adjustment instructions
 289         # on other targets. In this case we will step once more.
 290         #
 291
 292         send_gdb "finish\n"
 293         gdb_expect {
 294             -re "Run.*exit from.*marker1.* at" {
 295                 pass "finish from marker1"
 296             }
 297             default { fail "finish from marker1 (timeout)" ; return }
 298         }
 299
 300         gdb_expect {
 301             -re "marker1 \\(\\);.*$gdb_prompt $" {
 302                 send_gdb "step\n"
 303                 exp_continue
 304             }
 305             -re "func1 \\(\\);.*$gdb_prompt $" {
 306                 pass "back at main from marker1"
 307             }
 308             -re ".*$gdb_prompt $" {
 309                 fail "back at main from marker1"
 310             }
 311             default { fail "back at main from marker1 (timeout)" ; return }
 312         }
 313
 314         gdb_test "next" "for \\(count = 0.*" "next to `for' in watchpoint.exp"
 315
 316         # Now test that "until" works.  It's a bit tricky to test
 317         # "until", because compilers don't always arrange the code
 318         # exactly the same way, and we might get slightly different
 319         # sequences of statements.  But the following should be true
 320         # (if not it is a compiler or a debugger bug): The user who
 321         # does "until" at every statement of a loop should end up
 322         # stepping through the loop once, and the debugger should not
 323         # stop for any of the remaining iterations.
 324
 325         gdb_test "until" "ival1 = count.*" "until to ival1 assignment"
 326         gdb_test "until" "ival3 = count.*" "until to ival3 assignment"
 327         set test "until out of loop"
 328         gdb_test_multiple "until" $test {
 329             -re "(for \\(count = 0|\}).*$gdb_prompt $" {
 330                 gdb_test "until" "ival1 = count; /. Outside loop ./" $test
 331             }
 332             -re "ival1 = count; /. Outside loop ./.*$gdb_prompt $" {
 333                 pass $test
 334             }
 335         }
 336
 337         gdb_test "step" "ival2 = count.*" "step to ival2 assignment"
 338     }
 339 }
 340
 341 # Test stepping and other mundane operations with watchpoints enabled
 342 proc test_watchpoint_triggered_in_syscall {} {
 343     global gdb_prompt
 344
 345     # These tests won't work without printf support.
 346     if [gdb_skip_stdio_test "watchpoints triggered in syscall"] {
 347         return;
 348     }
 349     # Run until we get to the first marker function.
 350     set x 0
 351     set y 0
 352     set testname "Watch buffer passed to read syscall"
 353     if [runto marker2] then {
 354         gdb_test "watch buf\[0\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[0\\\]"
 355         gdb_test "watch buf\[1\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[1\\\]"
 356         gdb_test "watch buf\[2\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[2\\\]"
 357         gdb_test "watch buf\[3\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[3\\\]"
 358         gdb_test "watch buf\[4\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[4\\\]"
 359         gdb_test "break marker4" ".*Breakpoint.*"
 360
 361         gdb_test_no_output "set doread = 1"
 362
 363         # If we send gdb "123\n" before gdb has switched the tty, then it goes
 364         # to gdb, not the inferior, and we lose.  So that is why we have
 365         # watchpoint.c prompt us, so we can wait for that prompt.
 366
 367         send_gdb "continue\n";
 368         gdb_expect {
 369             -re "Continuing\\.\r\ntype stuff for buf now:" {
 370                 pass "continue to read"
 371             }
 372             default {
 373                 fail "continue to read";
 374                 return ;
 375             }
 376         }
 377
 378         set test "sent 123"
 379         gdb_test_multiple "123" $test {
 380             -re ".*\[Ww\]atchpoint.*buf\\\[0\\\].*Old value = 0.*New value = 49\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 381             -re ".*\[Ww\]atchpoint.*buf\\\[1\\\].*Old value = 0.*New value = 50\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 382             -re ".*\[Ww\]atchpoint.*buf\\\[2\\\].*Old value = 0.*New value = 51\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 383             -re ".*\[Ww\]atchpoint.*buf\\\[3\\\].*Old value = 0.*New value = 10\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 384             -re ".*$gdb_prompt $" { pass $test }
 385         }
 386
 387         # Examine the values in buf to see how many watchpoints we
 388         # should have printed.
 389         set test "print buf\[0\]"
 390         gdb_test_multiple $test $test {
 391             -re ".*= 49.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 392             -re ".*= 0.*$gdb_prompt $" { $test }
 393         }
 394         set test "print buf\[1\]"
 395         gdb_test_multiple $test $test {
 396             -re ".*= 50.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 397             -re ".*= 0.*$gdb_prompt $" { pass $test }
 398         }
 399         set test "print buf\[2\]"
 400         gdb_test_multiple $test $test {
 401             -re ".*= 51.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 402             -re ".*= 0.*$gdb_prompt $" { pass $test }
 403         }
 404         set test "print buf\[3\]"
 405         gdb_test_multiple $test $test {
 406             -re ".*= 10.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 407             -re ".*= 0.*$gdb_prompt $" { pass $test }
 408         }
 409
 410         # Did we find what we were looking for?  If not, flunk it.
 411         if [expr $x==$y] then { pass $testname } else { fail "$testname (only triggered $x watchpoints, expected $y)"}
 412
 413         # Continue until we hit the finishing marker function.
 414         # Make sure we hit no more watchpoints.
 415         gdb_test "cont" "Continuing.*Breakpoint.*marker4 \\(\\).*" \
 416             "continue to marker4"
 417
 418         # Disable everything so we can finish the program at full speed
 419         gdb_test_no_output "disable" "disable in test_watchpoint_triggered_in_syscall"
 420
 421         if [target_info exists gdb,noresults] { return }
 422
 423         gdb_continue_to_end "continue to exit in test_watchpoint_triggered_in_syscall"
 424     }
 425 }
 426
 427 # Do a simple test of of watching through a pointer when the pointer
 428 # itself changes.  Should add some more complicated stuff here.
 429
 430 proc test_complex_watchpoint {} {
 431     global gdb_prompt
 432
 433     if [runto marker4] then {
 434         gdb_test "watch ptr1->val" ".*\[Ww\]atchpoint \[0-9\]*: ptr1->val"
 435         gdb_test "break marker5" ".*Breakpoint.*"
 436
 437         gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ptr1->val.*Old value = 1.*New value = 2.*" "Test complex watchpoint"
 438
 439         # Continue until we hit the marker5 function.
 440         # Make sure we hit no more watchpoints.
 441
 442         gdb_test "cont" "Continuing.*Breakpoint.*marker5 \\(\\).*" \
 443             "did not trigger wrong watchpoint"
 444
 445         # Test watches of things declared locally in a function.
 446         # In particular, test that a watch of stack-based things
 447         # is deleted when the stack-based things go out of scope.
 448         #
 449         gdb_test_no_output "disable" "disable in test_complex_watchpoint"
 450         gdb_test "break marker6" ".*Breakpoint.*"
 451         gdb_test "cont" "Continuing.*Breakpoint.*marker6 \\(\\).*" \
 452             "continue to marker6"
 453         gdb_breakpoint [gdb_get_line_number "func2 breakpoint here"]
 454         gdb_continue_to_breakpoint "func2 breakpoint here"
 455
 456         # Test a watch of a single stack-based variable, whose scope
 457         # is the function we're now in.  This should auto-delete when
 458         # execution exits the scope of the watchpoint.
 459         #
 460         gdb_test "watch local_a" ".*\[Ww\]atchpoint \[0-9\]*: local_a" "set local watch"
 461         gdb_test "cont" "\[Ww\]atchpoint.*local_a.*" "trigger local watch"
 462
 463         set test "self-delete local watch"
 464         gdb_test_multiple "cont" $test {
 465             -re "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*\r\n$gdb_prompt $" {
 466                 pass $test
 467             }
 468             -re "can't compute CFA for this frame.*\r\n$gdb_prompt $" {
 469                 global compiler_info no_hw
 470
 471                 # GCC < 4.5.0 does not get LOCATIONS_VALID set by dwarf2read.c.
 472                 # Therefore epilogue unwinder gets applied which is
 473                 # incompatible with dwarf2_frame_cfa.
 474                 verbose -log "compiler_info: $compiler_info"
 475                 if {$no_hw && ([test_compiler_info {gcc-[0-3]-*}]
 476                                || [test_compiler_info {gcc-4-[0-4]-*}])} {
 477                     xfail "$test (old GCC has broken watchpoints in epilogues)"
 478                     return
 479                 }
 480                 fail $test
 481             }
 482         }
 483
 484         gdb_continue_to_breakpoint "func2 breakpoint here"
 485         # We should be in "func2" again now.  Test a watch of an
 486         # expression which includes both a stack-based local and
 487         # something whose scope is larger than this invocation
 488         # of "func2".  This should also auto-delete.
 489         #
 490         gdb_test "watch local_a + ival5" ".*\[Ww\]atchpoint \[0-9\]*: local_a . ival5" \
 491                  "set partially local watch"
 492         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
 493                  "trigger1 partially local watch"
 494         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
 495                  "trigger2 partially local watch"
 496         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
 497                  "self-delete partially local watch"
 498
 499         # We should be in "func2" again now.  Test a watch of a
 500         # static (non-stack-based) local.  Since this has scope
 501         # across any invocations of "func2", it should not auto-
 502         # delete.
 503         #
 504         gdb_continue_to_breakpoint "func2 breakpoint here"
 505         gdb_test "watch static_b" ".*\[Ww\]atchpoint \[0-9\]*: static_b" \
 506                  "set static local watch"
 507         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: static_b.*" \
 508                  "trigger static local watch"
 509         gdb_test "cont" "Continuing.*marker6 \\(\\).*" \
 510                  "continue after trigger static local watch"
 511         gdb_test "info break" ".*watchpoint.*static_b.*" \
 512                  "static local watch did not self-delete"
 513
 514         # We should be in "recurser" now.  Test a watch of a stack-
 515         # based local.  Symbols mentioned in a watchpoint are bound
 516         # at watchpoint-creation.  Thus, a watch of a stack-based
 517         # local to a recursing function should be bound only to that
 518         # one invocation, and should not trigger for other invocations.
 519         #
 520         gdb_test "tbreak recurser" ".*breakpoint.*"
 521         gdb_test "cont" "Continuing.*recurser.*"
 522         gdb_test "next" "if \\(x > 0.*" "next past local_x initialization"
 523         gdb_test "watch local_x" ".*\[Ww\]atchpoint \[0-9\]*: local_x" \
 524                  "set local watch in recursive call"
 525         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_x.*New value = 2.*" \
 526                  "trigger local watch in recursive call"
 527         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
 528                  "self-delete local watch in recursive call"
 529
 530         # Repeat the preceding test, but this time use "recurser::local_x" as
 531         # the variable to track.
 532         gdb_test "cont" "Continuing.*marker6.*"
 533         gdb_test "tbreak recurser" ".*breakpoint.*"
 534         gdb_test "cont" "Continuing.*recurser.*"
 535         gdb_test "next" "if \\(x > 0.*" "next past local_x initialization"
 536         gdb_test "watch recurser::local_x" ".*\[Ww\]atchpoint \[0-9\]*: recurser::local_x" \
 537                  "set local watch in recursive call with explicit scope"
 538         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: recurser::local_x.*New value = 2.*" \
 539                  "trigger local watch with explicit scope in recursive call"
 540         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
 541                  "self-delete local watch with explicit scope in recursive call (2)"
 542
 543         # Disable everything so we can finish the program at full speed
 544         gdb_test_no_output "disable" "disable in test_complex_watchpoint"
 545
 546         if [target_info exists gdb,noresults] { return }
 547
 548         gdb_continue_to_end "continue to exit in test_complex_watchpoint"
 549     }
 550 }
 551
 552 proc test_watchpoint_and_breakpoint {} {
 553     global gdb_prompt
 554
 555     # This is a test for PR gdb/38, which involves setting a
 556     # watchpoint right after you've reached a breakpoint.
 557
 558     if [runto func3] then {
 559         gdb_breakpoint [gdb_get_line_number "second x assignment"]
 560         gdb_continue_to_breakpoint "second x assignment"
 561         gdb_test "watch x" ".*atchpoint \[0-9\]+: x"
 562         gdb_test_multiple "next" "next after watch x" {
 563             -re ".*atchpoint \[0-9\]+: x\r\n\r\nOld value = 0\r\nNew value = 1\r\n.*$gdb_prompt $" {
 564                 pass "next after watch x"
 565             }
 566             -re "\[0-9\]+\[\t \]+y = 1;\r\n$gdb_prompt $" {
 567                 kfail "gdb/38" "next after watch x"
 568             }
 569         }
 570
 571         gdb_test_no_output "delete \$bpnum" "delete watch x"
 572     }
 573 }
 574
 575 proc test_constant_watchpoint {} {
 576     gdb_test "watch 5" "Cannot watch constant value `5'." "number is constant"
 577     gdb_test "watch (int *)5" "Cannot watch constant value `\\(int \\*\\)5'." \
 578     "number with cast is constant"
 579     gdb_test "watch marker1" "Cannot watch constant value `marker1'." \
 580     "marker1 is constant"
 581     gdb_test "watch count + 6" ".*atchpoint \[0-9\]+: count \\+ 6"
 582     gdb_test_no_output "delete \$bpnum" "delete watchpoint `count + 6'"
 583     gdb_test "watch 7 + count" ".*atchpoint \[0-9\]+: 7 \\+ count"
 584     gdb_test_no_output "delete \$bpnum" "delete watchpoint `7 + count'"
 585 }
 586
 587 proc test_disable_enable_software_watchpoint {} {
 588     # This is regression test for a bug that caused `enable' to fail
 589     # for software watchpoints.
 590
 591     # Watch something not memory to force a software watchpoint.
 592     gdb_test {watch $pc} ".*atchpoint \[0-9\]+: .pc"
 593
 594     gdb_test_no_output "disable \$bpnum" "disable watchpoint `\$pc'"
 595     gdb_test_no_output "enable \$bpnum" "reenable watchpoint `\$pc'"
 596
 597     gdb_test "info watchpoint \$bpnum" \
 598         ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+.pc.*" \
 599         "watchpoint `\$pc' is enabled"
 600
 601     gdb_test_no_output "delete \$bpnum" "delete watchpoint `\$pc'"
 602 }
 603
 604 proc test_watch_location {} {
 605     gdb_breakpoint [gdb_get_line_number "func5 breakpoint here"]
 606     gdb_continue_to_breakpoint "func5 breakpoint here"
 607
 608     gdb_test "watch -location *x" "atchpoint .*: .*" "watch -location .x"
 609
 610     gdb_test "continue" \
 611         "Continuing.*\[Ww\]atchpoint .*: .*New value = 27.*" \
 612         "continue with watch -location"
 613
 614     gdb_test_no_output "delete \$bpnum" "delete watch -location"
 615 }
 616
 617 # Tests watching areas larger than a word.
 618
 619 proc test_wide_location_1 {} {
 620     global no_hw
 621     global gdb_prompt
 622
 623     # This test watches two words on most 32-bit ABIs, and one word on
 624     # most 64-bit ABIs.
 625
 626     # Platforms where the target can't watch such a large region
 627     # should clear hw_expected below.
 628     if { $no_hw || [target_info exists gdb,no_hardware_watchpoints]
 629          || [istarget arm*-*-*]
 630          || ([istarget powerpc*-*-*] && ![is_lp64_target])} {
 631         set hw_expected 0
 632     } else {
 633         set hw_expected 1
 634     }
 635
 636     gdb_breakpoint [gdb_get_line_number "func6 breakpoint here"]
 637     gdb_continue_to_breakpoint "func6 breakpoint here"
 638
 639     if { $hw_expected } {
 640         gdb_test "watch foo2" "Hardware watchpoint .*: .*" "watch foo2"
 641         gdb_test "continue" \
 642             "Continuing.*Hardware watchpoint .*: .*New value = \\\{val = \\\{0, 11\\\}\\\}.*" \
 643             "continue with watch foo2"
 644     } else {
 645         gdb_test "watch foo2" "atchpoint .*: .*" "watch foo2"
 646         set test "continue with watch foo2"
 647         gdb_test_multiple "cont" $test {
 648             -re "Continuing.*\[Ww\]atchpoint .*: .*New value = \\\{val = \\\{0, 11\\\}\\\}.*$gdb_prompt $" {
 649                 pass $test
 650             }
 651             -re "Could not insert hardware breakpoints:.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
 652                 # This may happen with remote targets that support
 653                 # hardware watchpoints.  We only find out the
 654                 # watchpoint was too large, for example, at insert
 655                 # time.  If GDB is ever adjusted to downgrade the
 656                 # watchpoint automatically in this case, this match
 657                 # should be removed.
 658                 pass $test
 659             }
 660         }
 661     }
 662
 663     gdb_test_no_output "delete \$bpnum" "delete watch foo2"
 664 }
 665
 666 proc test_wide_location_2 {} {
 667     global no_hw
 668     global gdb_prompt
 669
 670     # This test watches four words on most 32-bit ABIs, and two words
 671     # on 64-bit ABIs.
 672
 673     # Platforms where the target can't watch such a large region
 674     # should clear hw_expected below.
 675     if { $no_hw || [target_info exists gdb,no_hardware_watchpoints]
 676          || [istarget arm*-*-*]
 677          || [istarget powerpc*-*-*]} {
 678         set hw_expected 0
 679     } else {
 680         set hw_expected 1
 681     }
 682
 683     gdb_breakpoint [gdb_get_line_number "func7 breakpoint here"]
 684     gdb_continue_to_breakpoint "func7 breakpoint here"
 685
 686     if { $hw_expected } {
 687         gdb_test "watch foo4" "Hardware watchpoint .*: .*" "watch foo4"
 688         gdb_test "continue" \
 689             "Continuing.*Hardware watchpoint .*: .*New value = \\\{val = \\\{0, 0, 0, 33\\\}\\\}.*" \
 690             "continue with watch foo4"
 691     } else {
 692         gdb_test "watch foo4" "atchpoint .*: .*" "watch foo4"
 693         set test "continue with watch foo4"
 694         gdb_test_multiple "cont" $test {
 695             -re "Continuing.*\[Ww\]atchpoint .*: .*New value = \\\{val = \\\{0, 0, 0, 33\\\}\\\}.*$gdb_prompt $" {
 696                 pass $test
 697             }
 698             -re "Could not insert hardware breakpoints:.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
 699                 # This may happen with remote targets that support
 700                 # hardware watchpoints.  We only find out the
 701                 # watchpoint was too large, for example, at insert
 702                 # time.  If GDB is ever adjusted to downgrade the
 703                 # watchpoint automatically in this case, this match
 704                 # should be removed.
 705                 pass $test
 706             }
 707         }
 708     }
 709
 710     gdb_test_no_output "delete \$bpnum" "delete watch foo4"
 711 }
 712
 713 proc test_inaccessible_watchpoint {} {
 714     global gdb_prompt
 715
 716     # This is a test for watchpoints on currently inaccessible (but later
 717     # valid) memory.
 718
 719     if [runto func4] then {
 720         # Make sure we only allow memory access errors.
 721         set msg "watchpoint refused to insert on nonexistent struct member"
 722         gdb_test_multiple "watch struct1.nosuchmember" $msg {
 723             -re ".*atchpoint \[0-9\]+: struct1.nosuchmember.*$gdb_prompt $" {
 724                 # PR breakpoints/9681
 725                 fail $msg
 726             }
 727             -re "There is no member named nosuchmember\\..*$gdb_prompt $" {
 728                 pass $msg
 729             }
 730         }
 731
 732         # See whether a watchpoint on a normal variable is a hardware
 733         # watchpoint or not.  The watchpoints on NULL should be hardware
 734         # iff this one is.
 735         set watchpoint_msg "Watchpoint"
 736         gdb_test_multiple "watch global_ptr" "watch global_ptr" {
 737             -re "Watchpoint \[0-9\]+: global_ptr\r\n.*$gdb_prompt $" {
 738                 pass "watch global_ptr"
 739             }
 740             -re "Hardware watchpoint \[0-9\]+: global_ptr\r\n.*$gdb_prompt $" {
 741                 set watchpoint_msg "Hardware watchpoint"
 742                 pass "watch global_ptr"
 743             }
 744         }
 745         delete_breakpoints
 746
 747         # Make sure that we can watch a constant address, and correctly
 748         # use a HW watchpoint if supported.
 749         gdb_test "watch *(int *) 0" \
 750             "$watchpoint_msg \[0-9\]+: \\*\\(int \\*\\) 0"
 751         delete_breakpoints
 752
 753         # The same, but using -location through an indirection.
 754         gdb_test "watch -location *global_ptr" \
 755             "$watchpoint_msg \[0-9\]+: \-location \\*global_ptr"
 756         delete_breakpoints
 757
 758         # This step requires two HW watchpoints.  Since some platforms only
 759         # have a single one, accept either SW or HW watchpoint in this case.
 760         if {[skip_hw_watchpoint_multi_tests]} {
 761             set watchpoint_msg "(Watchpoint|Hardware watchpoint)"
 762         }
 763
 764         gdb_test "watch *global_ptr" "$watchpoint_msg \[0-9\]+: \\\*global_ptr"
 765         gdb_test "set \$global_ptr_breakpoint_number = \$bpnum" ""
 766         gdb_test "next" ".*global_ptr = buf.*" "global_ptr next"
 767         gdb_test_multiple "next" "next over ptr init" {
 768             -re ".*atchpoint \[0-9\]+: \\*global_ptr\r\n\r\nOld value = .*\r\nNew value = 3 .*\r\n.*$gdb_prompt $" {
 769                 # We can not test for <unknown> here because NULL may be readable.
 770                 # This test does rely on *NULL != 3.
 771                 pass "next over ptr init"
 772             }
 773         }
 774         gdb_test_multiple "next" "next over buffer set" {
 775             -re ".*atchpoint \[0-9\]+: \\*global_ptr\r\n\r\nOld value = 3 .*\r\nNew value = 7 .*\r\n.*$gdb_prompt $" {
 776                 pass "next over buffer set"
 777             }
 778         }
 779         gdb_test "delete \$global_ptr_breakpoint_number" ""
 780         gdb_test "watch **global_ptr_ptr" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr"
 781         gdb_test "set \$global_ptr_ptr_breakpoint_number = \$bpnum" ""
 782         gdb_test "next" ".*global_ptr_ptr = &global_ptr.*" "global_ptr_ptr next"
 783         gdb_test "next" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr\[\r\n\]+Old value = .*\r\nNew value = 7 .*" "next over global_ptr_ptr init"
 784         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"
 785         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"
 786         gdb_test_no_output "delete \$global_ptr_ptr_breakpoint_number"
 787     }
 788 }
 789
 790 proc test_no_hw_watchpoints {} {
 791     global testfile
 792
 793     clean_restart $testfile
 794
 795     # Verify that a user can force GDB to use "slow" watchpoints.
 796     # (This proves rather little on kernels that don't support
 797     # fast watchpoints, but still...)
 798     #
 799     if ![runto_main] then { fail "watch tests suppressed" }
 800
 801     gdb_test_no_output "set can-use-hw-watchpoints 0" "disable fast watches"
 802
 803     gdb_test "show can-use-hw-watchpoints" \
 804         "Debugger's willingness to use watchpoint hardware is 0." \
 805         "show disable fast watches"
 806
 807     gdb_test "watch ival3 if  count > 1" \
 808         "Watchpoint \[0-9\]*: ival3.*" \
 809         "set slow conditional watch"
 810
 811     gdb_test "continue" \
 812         "Watchpoint \[0-9\]*: ival3.*Old value = 1.*New value = 2.*" \
 813         "trigger slow conditional watch"
 814
 815     gdb_test_no_output "delete \$bpnum" "delete watch ival3"
 816
 817     # We've explicitly disabled hardware watches.  Verify that GDB
 818     # refrains from using them.
 819     #
 820     gdb_test "rwatch ival3" \
 821         "Expression cannot be implemented with read/access watchpoint..*" \
 822         "rwatch disallowed when can-set-hw-watchpoints cleared"
 823
 824     # Re-enable hardware watchpoints if necessary.
 825     if ![target_info exists gdb,no_hardware_watchpoints] {
 826         gdb_test_no_output "set can-use-hw-watchpoints 1" ""
 827     }
 828 }
 829
 830 proc test_watchpoint_in_big_blob {} {
 831     global gdb_prompt
 832
 833     # On native targets where we do hardware resource accounting, this
 834     # may end up as a software watchpoint.
 835     set ok 0
 836     set test "watch buf"
 837     gdb_test_multiple "watch buf" $test {
 838         -re "Hardware watchpoint \[0-9\]+: buf.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
 839             # This may happen with remote targets (where we don't do
 840             # resource accounting) that support hardware watchpoints,
 841             # when breakpoint always-inserted is on.  The watchpoint
 842             # was too large, for example.  If GDB is ever adjusted to
 843             # downgrade the watchpoint automatically in this case,
 844             # this match should be removed.  Note the breakpoint has
 845             # been created, and is in the list, so it needs deleting.
 846             pass $test
 847         }
 848         -re ".*atchpoint \[0-9\]+: buf.*$gdb_prompt $" {
 849             pass $test
 850             set ok 1
 851         }
 852     }
 853
 854     if { $ok } {
 855         set test "watchpoint on buf hit"
 856         gdb_test_multiple "cont" $test {
 857             -re "Continuing.*atchpoint \[0-9\]+: buf\r\n\r\nOld value = .*testte\".*$gdb_prompt $" {
 858                 pass $test
 859             }
 860             -re "Could not insert hardware breakpoints:.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
 861                 # This may happen with remote targets that support
 862                 # hardware watchpoints.  We only find out the
 863                 # watchpoint was too large, for example, at insert
 864                 # time.  If GDB is ever adjusted to downgrade the
 865                 # watchpoint automatically in this case, this match
 866                 # should be removed.
 867                 pass $test
 868             }
 869         }
 870     }
 871
 872     gdb_test_no_output "delete \$bpnum" "delete watch buf"
 873 }
 874
 875 # Start with a fresh gdb.
 876
 877 set prev_timeout $timeout
 878 set timeout 600
 879 verbose "Timeout now 600 sec.\n"
 880
 881 test_no_hw_watchpoints
 882
 883 proc do_tests {} {
 884     global testfile
 885     global no_hw
 886
 887     clean_restart $testfile
 888
 889     if {$no_hw || [target_info exists gdb,no_hardware_watchpoints]} {
 890         gdb_test_no_output "set can-use-hw-watchpoints 0" ""
 891     }
 892
 893     if [initialize] then {
 894
 895         test_simple_watchpoint
 896
 897         test_disabling_watchpoints
 898
 899         if ![target_info exists gdb,cannot_call_functions] {
 900             test_stepping
 901         }
 902     }
 903
 904     # Tests below don't rely on the markers and watchpoint set by
 905     # `initialize' anymore.
 906     clean_restart $testfile
 907
 908     if {$no_hw || [target_info exists gdb,no_hardware_watchpoints]} {
 909         gdb_test_no_output "set can-use-hw-watchpoints 0" ""
 910     }
 911
 912     # Only enabled for some targets merely because it has not been tested
 913     # elsewhere.
 914     # On sparc-sun-sunos4.1.3, GDB was running all the way to the marker4
 915     # breakpoint before stopping for the watchpoint.  I don't know why.
 916     if {[istarget "hppa*-*-*"]} then {
 917         test_watchpoint_triggered_in_syscall
 918     }
 919
 920     test_complex_watchpoint
 921
 922     test_inaccessible_watchpoint
 923
 924     test_watchpoint_and_breakpoint
 925
 926     test_watchpoint_in_big_blob
 927
 928     test_constant_watchpoint
 929
 930     test_disable_enable_software_watchpoint
 931
 932     test_watch_location
 933
 934     test_wide_location_1
 935     test_wide_location_2
 936 }
 937
 938 # On targets that can do hardware watchpoints, run the tests twice:
 939 # once with hardware watchpoints enabled; another with hardware
 940 # watchpoints force-disabled.
 941
 942 do_tests
 943 if ![target_info exists gdb,no_hardware_watchpoints] {
 944     with_test_prefix "no-hw" {
 945         set no_hw 1
 946         do_tests
 947     }
 948 }
 949
 950 # Restore old timeout
 951 set timeout $prev_timeout
 952 verbose "Timeout now $timeout sec.\n"