gdb/testsuite/gdb.base/watchpoint.exp

   1 # Copyright 1992-2019 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 standard_testfile
  20
  21 if [get_compiler_info] {
  22     return -1
  23 }
  24
  25 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  26      untested "failed to compile"
  27      return -1
  28 }
  29
  30 # True if we're forcing no hardware watchpoints.
  31 set no_hw 0
  32
  33 # Prepare for watchpoint tests by setting up two breakpoints and one
  34 # watchpoint.
  35 #
  36 # We use breakpoints at marker functions to get past all the startup code,
  37 # so we can get to the watchpoints in a reasonable amount of time from a
  38 # known starting point.
  39 #
  40 # For simplicity, so we always know how to reference specific breakpoints or
  41 # watchpoints by number, we expect a particular ordering and numbering of
  42 # each in the combined breakpoint/watchpoint table, as follows:
  43 #
  44 #       Number          What            Where
  45 #       1               Breakpoint      marker1()
  46 #       2               Breakpoint      marker2()
  47 #       3               Watchpoint      ival3
  48
  49 proc initialize {} {
  50     global gdb_prompt
  51     global hex
  52     global decimal
  53     global srcfile
  54
  55     if [gdb_test "break marker1" "Breakpoint 1 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker1" ] {
  56       return 0
  57     }
  58
  59
  60     if [gdb_test "break marker2" "Breakpoint 2 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker2" ] {
  61       return 0
  62     }
  63
  64
  65     if [gdb_test "info break" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*" "info break in watchpoint.exp" ] {
  66       return 0
  67     }
  68
  69     gdb_test "watch ival3" ".*\[Ww\]atchpoint 3: ival3.*" "set watchpoint on ival3"
  70
  71     if [gdb_test "info watch" "3\[ \]*.*watchpoint.*ival3" "watchpoint found in watchpoint/breakpoint table" ] {
  72       return 0
  73     }
  74
  75
  76     # After installing the watchpoint, we disable it until we are ready
  77     # to use it.  This allows the test program to run at full speed until
  78     # we get to the first marker function.
  79
  80     if [gdb_test "disable 3" "disable 3\[\r\n\]+" "disable watchpoint" ] {
  81       return 0
  82     }
  83
  84
  85     return 1
  86 }
  87
  88 #
  89 # Test simple watchpoint.
  90 #
  91
  92 proc test_simple_watchpoint {} {
  93     global gdb_prompt
  94     global hex
  95     global decimal
  96
  97     # Ensure that the watchpoint is disabled when we startup.
  98
  99     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_simple_watchpoint" ] {
 100       return 0
 101     }
 102
 103     # Run until we get to the first marker function.
 104
 105     gdb_run_cmd
 106     set timeout 600
 107     set test "run to marker1 in test_simple_watchpoint"
 108     set retcode [gdb_test_multiple "" $test {
 109         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 110             pass $test
 111         }
 112     }]
 113
 114     if { $retcode != 0 } {
 115         return
 116     }
 117
 118     # After reaching the marker function, enable the watchpoint.
 119
 120     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "enable watchpoint" ] {
 121       return
 122     }
 123
 124
 125     gdb_test "break func1" "Breakpoint.*at.*"
 126     gdb_test_no_output "set \$func1_breakpoint_number = \$bpnum"
 127
 128     gdb_test "continue" "Continuing.*Breakpoint \[0-9\]*, func1.*" \
 129         "continue to breakpoint at func1"
 130
 131     # Continue until the first change, from -1 to 0
 132
 133     set test "watchpoint hit, first time"
 134     gdb_test_multiple "cont" $test {
 135         -re "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*$gdb_prompt $" {
 136             pass $test
 137         }
 138         -re "Continuing.*Breakpoint.*func1.*$gdb_prompt $" {
 139             setup_xfail "m68*-*-*" 2597
 140             fail "thought it hit breakpoint at func1 twice"
 141             gdb_test_no_output "delete \$func1_breakpoint_number"
 142             gdb_test "continue" "\
 143 Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count;" \
 144                 $test
 145         }
 146     }
 147
 148     # Check that the hit count is reported correctly
 149     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 1 time.*" "watchpoint hit count is 1"
 150
 151     gdb_test_no_output "delete \$func1_breakpoint_number"
 152
 153     # Continue until the next change, from 0 to 1.
 154     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit, second time"
 155
 156     # Check that the hit count is reported correctly
 157     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 2 times.*" "watchpoint hit count is 2"
 158
 159     # Continue until the next change, from 1 to 2.
 160     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*" "watchpoint hit, third time"
 161
 162     # Check that the hit count is reported correctly
 163     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 3 times.*" "watchpoint hit count is 3"
 164
 165     # Continue until the next change, from 2 to 3.
 166     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*" "watchpoint hit, fourth time"
 167
 168     # Check that the hit count is reported correctly
 169     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 4 times.*" "watchpoint hit count is 4"
 170
 171     # Continue until the next change, from 3 to 4.
 172     # Note that this one is outside the loop.
 173
 174     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*" "watchpoint hit, fifth time"
 175
 176     # Check that the hit count is reported correctly
 177     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 5 times.*" "watchpoint hit count is 5"
 178
 179     # Continue until we hit the finishing marker function.
 180     # Make sure we hit no more watchpoints.
 181
 182     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \(\).*" \
 183         "continue to marker2"
 184
 185     # Disable the watchpoint so we run at full speed until we exit.
 186
 187     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "watchpoint disabled" ] {
 188       return
 189     }
 190
 191
 192     # Run until process exits.
 193
 194     if [target_info exists gdb,noresults] { return }
 195
 196     gdb_continue_to_end "continue to exit in test_simple_watchpoint"
 197 }
 198
 199 # Test disabling watchpoints.
 200
 201 proc test_disabling_watchpoints {} {
 202     global gdb_prompt
 203     global binfile
 204     global srcfile
 205     global decimal
 206     global hex
 207
 208     gdb_test "info watch" "\[0-9]+\[ \]*.*watchpoint.*ival3.*" "watchpoints found in watchpoint/breakpoint table"
 209
 210     # Ensure that the watchpoint is disabled when we startup.
 211
 212     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_disabling_watchpoints" ] {
 213       return 0
 214     }
 215
 216
 217     # Run until we get to the first marker function.
 218
 219     gdb_run_cmd
 220     set timeout 600
 221     set test "run to marker1 in test_disabling_watchpoints"
 222     set retcode [gdb_test_multiple "" $test {
 223         -re "Breakpoint 1, marker1 .*$gdb_prompt $" {
 224             pass $test
 225         }
 226     }]
 227
 228     if { $retcode != 0 } {
 229         return
 230     }
 231
 232     # After reaching the marker function, enable the watchpoint.
 233
 234     if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "watchpoint enabled" ] {
 235       return
 236     }
 237
 238
 239     # Continue until the first change, from -1 to 0
 240     # Don't check the old value, because on VxWorks the variable value
 241     # will not have been reinitialized.
 242     gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, first time"
 243
 244     # Continue until the next change, from 0 to 1.
 245     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"
 246
 247     # Disable the watchpoint but leave breakpoints
 248
 249     if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint #2 in test_disabling_watchpoints" ] {
 250       return 0
 251     }
 252
 253
 254     # Check watchpoint list, looking for the entry that confirms the
 255     # watchpoint is disabled.
 256     gdb_test "info watchpoints" "\[0-9]+\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*" "watchpoint disabled in table"
 257
 258     # Continue until we hit the finishing marker function.
 259     # Make sure we hit no more watchpoints.
 260     gdb_test "cont" "Continuing.*Breakpoint.*marker2 \\(\\).*" \
 261         "disabled watchpoint skipped"
 262
 263     if [target_info exists gdb,noresults] { return }
 264
 265     gdb_continue_to_end "continue to exit in test_disabling_watchpoints"
 266 }
 267
 268 # Test stepping and other mundane operations with watchpoints enabled
 269 proc test_stepping {} {
 270     global gdb_prompt
 271
 272     if [runto marker1] then {
 273         gdb_test "watch ival2" ".*\[Ww\]atchpoint \[0-9\]*: ival2"
 274
 275         # Well, let's not be too mundane.  It should be a *bit* of a challenge
 276         gdb_test "break func2 if 0" "Breakpoint.*at.*"
 277         gdb_test "p \$func2_breakpoint_number = \$bpnum" " = .*"
 278
 279         gdb_test "p func1 ()" "= 73" \
 280             "calling function with watchpoint enabled"
 281
 282         #
 283         # "finish" brings us back to main.
 284         # On some targets (e.g. alpha) gdb will stop from the finish in midline
 285         # of the marker1 call. This is due to register restoring code on
 286         # the alpha and might be caused by stack adjustment instructions
 287         # on other targets. In this case we will step once more.
 288         #
 289
 290         send_gdb "finish\n"
 291         gdb_expect {
 292             -re "Run.*exit from.*marker1.* at" {
 293                 pass "finish from marker1"
 294             }
 295             default { fail "finish from marker1 (timeout)" ; return }
 296         }
 297
 298         gdb_expect {
 299             -re "marker1 \\(\\);.*$gdb_prompt $" {
 300                 send_gdb "step\n"
 301                 exp_continue
 302             }
 303             -re "func1 \\(\\);.*$gdb_prompt $" {
 304                 pass "back at main from marker1"
 305             }
 306             -re ".*$gdb_prompt $" {
 307                 fail "back at main from marker1"
 308             }
 309             default { fail "back at main from marker1 (timeout)" ; return }
 310         }
 311
 312         gdb_test "next" "for \\(count = 0.*" "next to `for' in watchpoint.exp"
 313
 314         # Now test that "until" works.  It's a bit tricky to test
 315         # "until", because compilers don't always arrange the code
 316         # exactly the same way, and we might get slightly different
 317         # sequences of statements.  But the following should be true
 318         # (if not it is a compiler or a debugger bug): The user who
 319         # does "until" at every statement of a loop should end up
 320         # stepping through the loop once, and the debugger should not
 321         # stop for any of the remaining iterations.
 322
 323         gdb_test "until" "ival1 = count.*" "until to ival1 assignment"
 324         gdb_test "until" "ival3 = count.*" "until to ival3 assignment"
 325         set test "until out of loop"
 326         gdb_test_multiple "until" $test {
 327             -re "(for \\(count = 0|\}).*$gdb_prompt $" {
 328                 gdb_test "until" "ival1 = count; /. Outside loop ./" $test
 329             }
 330             -re "ival1 = count; /. Outside loop ./.*$gdb_prompt $" {
 331                 pass $test
 332             }
 333         }
 334
 335         gdb_test "step" "ival2 = count.*" "step to ival2 assignment"
 336     }
 337 }
 338
 339 # Test stepping and other mundane operations with watchpoints enabled
 340 proc test_watchpoint_triggered_in_syscall {} {
 341     global gdb_prompt
 342
 343     # These tests won't work without printf support.
 344     if [gdb_skip_stdio_test "watchpoints triggered in syscall"] {
 345         return
 346     }
 347     # Run until we get to the first marker function.
 348     set x 0
 349     set y 0
 350     set testname "watch buffer passed to read syscall"
 351     if [runto marker2] then {
 352         gdb_test "watch buf\[0\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[0\\\]"
 353         gdb_test "watch buf\[1\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[1\\\]"
 354         gdb_test "watch buf\[2\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[2\\\]"
 355         gdb_test "watch buf\[3\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[3\\\]"
 356         gdb_test "watch buf\[4\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[4\\\]"
 357         gdb_test "break marker4" ".*Breakpoint.*"
 358
 359         gdb_test_no_output "set doread = 1"
 360
 361         # If we send gdb "123\n" before gdb has switched the tty, then it goes
 362         # to gdb, not the inferior, and we lose.  So that is why we have
 363         # watchpoint.c prompt us, so we can wait for that prompt.
 364
 365         send_gdb "continue\n"
 366         gdb_expect {
 367             -re "Continuing\\.\r\ntype stuff for buf now:" {
 368                 pass "continue to read"
 369             }
 370             default {
 371                 fail "continue to read"
 372                 return
 373             }
 374         }
 375
 376         set test "sent 123"
 377         gdb_test_multiple "123" $test {
 378             -re ".*\[Ww\]atchpoint.*buf\\\[0\\\].*Old value = 0.*New value = 49\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 379             -re ".*\[Ww\]atchpoint.*buf\\\[1\\\].*Old value = 0.*New value = 50\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 380             -re ".*\[Ww\]atchpoint.*buf\\\[2\\\].*Old value = 0.*New value = 51\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 381             -re ".*\[Ww\]atchpoint.*buf\\\[3\\\].*Old value = 0.*New value = 10\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
 382             -re ".*$gdb_prompt $" { pass $test }
 383         }
 384
 385         # Examine the values in buf to see how many watchpoints we
 386         # should have printed.
 387         set test "print buf\[0\]"
 388         gdb_test_multiple $test $test {
 389             -re ".*= 49.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 390             -re ".*= 0.*$gdb_prompt $" { $test }
 391         }
 392         set test "print buf\[1\]"
 393         gdb_test_multiple $test $test {
 394             -re ".*= 50.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 395             -re ".*= 0.*$gdb_prompt $" { pass $test }
 396         }
 397         set test "print buf\[2\]"
 398         gdb_test_multiple $test $test {
 399             -re ".*= 51.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 400             -re ".*= 0.*$gdb_prompt $" { pass $test }
 401         }
 402         set test "print buf\[3\]"
 403         gdb_test_multiple $test $test {
 404             -re ".*= 10.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
 405             -re ".*= 0.*$gdb_prompt $" { pass $test }
 406         }
 407
 408         # Did we find what we were looking for?  If not, flunk it.
 409         if [expr $x==$y] then { pass $testname } else { fail "$testname (only triggered $x watchpoints, expected $y)"}
 410
 411         # Continue until we hit the finishing marker function.
 412         # Make sure we hit no more watchpoints.
 413         gdb_test "cont" "Continuing.*Breakpoint.*marker4 \\(\\).*" \
 414             "continue to marker4"
 415
 416         # Disable everything so we can finish the program at full speed
 417         gdb_test_no_output "disable" "disable in test_watchpoint_triggered_in_syscall"
 418
 419         if [target_info exists gdb,noresults] { return }
 420
 421         gdb_continue_to_end "continue to exit in test_watchpoint_triggered_in_syscall"
 422     }
 423 }
 424
 425 # Do a simple test of of watching through a pointer when the pointer
 426 # itself changes.  Should add some more complicated stuff here.
 427
 428 proc test_complex_watchpoint {} {
 429     global gdb_prompt
 430
 431     if [runto marker4] then {
 432         gdb_test "watch ptr1->val" ".*\[Ww\]atchpoint \[0-9\]*: ptr1->val"
 433         gdb_test "break marker5" ".*Breakpoint.*"
 434
 435         gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ptr1->val.*Old value = 1.*New value = 2.*" "test complex watchpoint"
 436
 437         # Continue until we hit the marker5 function.
 438         # Make sure we hit no more watchpoints.
 439
 440         gdb_test "cont" "Continuing.*Breakpoint.*marker5 \\(\\).*" \
 441             "did not trigger wrong watchpoint"
 442
 443         # Test watches of things declared locally in a function.
 444         # In particular, test that a watch of stack-based things
 445         # is deleted when the stack-based things go out of scope.
 446         #
 447         gdb_test_no_output "disable" "disable in test_complex_watchpoint, first time"
 448         gdb_test "break marker6" ".*Breakpoint.*"
 449         gdb_test "cont" "Continuing.*Breakpoint.*marker6 \\(\\).*" \
 450             "continue to marker6"
 451         gdb_breakpoint [gdb_get_line_number "func2 breakpoint here"]
 452         gdb_continue_to_breakpoint "func2 breakpoint here, first time"
 453
 454         # Test a watch of a single stack-based variable, whose scope
 455         # is the function we're now in.  This should auto-delete when
 456         # execution exits the scope of the watchpoint.
 457         #
 458         gdb_test "watch local_a" ".*\[Ww\]atchpoint \[0-9\]*: local_a" "set local watch"
 459         gdb_test "cont" "\[Ww\]atchpoint.*local_a.*" "trigger local watch"
 460
 461         set test "self-delete local watch"
 462         gdb_test_multiple "cont" $test {
 463             -re "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*\r\n$gdb_prompt $" {
 464                 pass $test
 465             }
 466             -re "can't compute CFA for this frame.*\r\n$gdb_prompt $" {
 467                 global no_hw
 468
 469                 # GCC < 4.5.0 does not get LOCATIONS_VALID set by dwarf2read.c.
 470                 # Therefore epilogue unwinder gets applied which is
 471                 # incompatible with dwarf2_frame_cfa.
 472                 if {$no_hw && ([test_compiler_info {gcc-[0-3]-*}]
 473                                || [test_compiler_info {gcc-4-[0-4]-*}])} {
 474                     xfail "$test (old GCC has broken watchpoints in epilogues)"
 475                     return
 476                 }
 477                 fail $test
 478             }
 479         }
 480
 481         gdb_continue_to_breakpoint "func2 breakpoint here, second time"
 482         # We should be in "func2" again now.  Test a watch of an
 483         # expression which includes both a stack-based local and
 484         # something whose scope is larger than this invocation
 485         # of "func2".  This should also auto-delete.
 486         #
 487         gdb_test "watch local_a + ival5" ".*\[Ww\]atchpoint \[0-9\]*: local_a . ival5" \
 488                  "set partially local watch"
 489         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
 490                  "trigger1 partially local watch"
 491         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
 492                  "trigger2 partially local watch"
 493         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
 494                  "self-delete partially local watch"
 495
 496         # We should be in "func2" again now.  Test a watch of a
 497         # static (non-stack-based) local.  Since this has scope
 498         # across any invocations of "func2", it should not auto-
 499         # delete.
 500         #
 501         gdb_continue_to_breakpoint "func2 breakpoint here, third time"
 502         gdb_test "watch static_b" ".*\[Ww\]atchpoint \[0-9\]*: static_b" \
 503                  "set static local watch"
 504         gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: static_b.*" \
 505                  "trigger static local watch"
 506         gdb_test "cont" "Continuing.*marker6 \\(\\).*" \
 507                  "continue after trigger static local watch"
 508         gdb_test "info break" ".*watchpoint.*static_b.*" \
 509                  "static local watch did not self-delete"
 510
 511         # We should be in "recurser" now.  Test a watch of a stack-
 512         # based local.  Symbols mentioned in a watchpoint are bound
 513         # at watchpoint-creation.  Thus, a watch of a stack-based
 514         # local to a recursing function should be bound only to that
 515         # one invocation, and should not trigger for other invocations.
 516         #
 517         with_test_prefix "local_x" {
 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 local_x" ".*\[Ww\]atchpoint \[0-9\]*: local_x" \
 522                 "set local watch in recursive call"
 523             gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_x.*New value = 2.*" \
 524                 "trigger local watch 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 in recursive call"
 527         }
 528
 529         # Repeat the preceding test, but this time use "recurser::local_x" as
 530         # the variable to track.
 531         with_test_prefix "recurser::local_x" {
 532             gdb_test "cont" "Continuing.*marker6.*" "continue to marker6"
 533             gdb_test "tbreak recurser" ".*breakpoint.*"
 534             gdb_test "cont" "Continuing.*recurser.*" "continue to 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
 544         # Disable everything so we can finish the program at full speed
 545         gdb_test_no_output "disable" "disable in test_complex_watchpoint, second time"
 546
 547         if [target_info exists gdb,noresults] { return }
 548
 549         gdb_continue_to_end "continue to exit in test_complex_watchpoint"
 550     }
 551 }
 552
 553 proc test_watchpoint_and_breakpoint {} {
 554     global gdb_prompt
 555
 556     # This is a test for PR breakpoints/7143, which involves setting a
 557     # watchpoint right after you've reached a breakpoint.
 558
 559     if [runto func3] then {
 560         gdb_breakpoint [gdb_get_line_number "second x assignment"]
 561         gdb_continue_to_breakpoint "second x assignment"
 562         gdb_test "watch x" ".*atchpoint \[0-9\]+: x"
 563         gdb_test "next" \
 564             ".*atchpoint \[0-9\]+: x\r\n\r\nOld value = 0\r\nNew value = 1\r\n.*" \
 565             "next after watch x"
 566
 567         gdb_test_no_output "delete \$bpnum" "delete watch x"
 568     }
 569 }
 570
 571 proc test_constant_watchpoint {} {
 572     gdb_test "watch 5" "Cannot watch constant value `5'." "number is constant"
 573     gdb_test "watch (int *)5" "Cannot watch constant value `\\(int \\*\\)5'." \
 574     "number with cast is constant"
 575     gdb_test "watch marker1" "Cannot watch constant value `marker1'." \
 576     "marker1 is constant"
 577     gdb_test "watch count + 6" ".*atchpoint \[0-9\]+: count \\+ 6"
 578     gdb_test_no_output "delete \$bpnum" "delete watchpoint `count + 6'"
 579     gdb_test "watch 7 + count" ".*atchpoint \[0-9\]+: 7 \\+ count"
 580     gdb_test_no_output "delete \$bpnum" "delete watchpoint `7 + count'"
 581 }
 582
 583 proc test_disable_enable_software_watchpoint {} {
 584     # This is regression test for a bug that caused `enable' to fail
 585     # for software watchpoints.
 586
 587     # Watch something not memory to force a software watchpoint.
 588     gdb_test {watch $pc} ".*atchpoint \[0-9\]+: .pc"
 589
 590     gdb_test_no_output "disable \$bpnum" "disable watchpoint `\$pc'"
 591     gdb_test_no_output "enable \$bpnum" "reenable watchpoint `\$pc'"
 592
 593     gdb_test "info watchpoint \$bpnum" \
 594         ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+.pc.*" \
 595         "watchpoint `\$pc' is enabled"
 596
 597     gdb_test_no_output "delete \$bpnum" "delete watchpoint `\$pc'"
 598 }
 599
 600 proc test_watch_location {} {
 601     global gdb_prompt
 602
 603     gdb_breakpoint [gdb_get_line_number "func5 breakpoint here"]
 604     gdb_continue_to_breakpoint "func5 breakpoint here"
 605
 606     # Check first if a null pointer can be dereferenced on the target.
 607     gdb_test_multiple "p *nullptr" "" {
 608         -re "Cannot access memory at address 0x0.*$gdb_prompt $" {
 609             gdb_test "watch -location nullptr->p->x" \
 610                 "Cannot access memory at address 0x0"
 611         }
 612         -re ".*$gdb_prompt $" {
 613             # Null pointer dereference is legitimate.
 614         }
 615     }
 616
 617     gdb_test "watch -location *x" "atchpoint .*: .*" "watch -location .x"
 618
 619     gdb_test "continue" \
 620         "Continuing.*\[Ww\]atchpoint .*: .*New value = 27.*" \
 621         "continue with watch -location"
 622
 623     gdb_test_no_output "delete \$bpnum" "delete watch -location"
 624 }
 625
 626 # Tests watching areas larger than a word.
 627
 628 proc test_wide_location_1 {} {
 629     global no_hw
 630     global gdb_prompt
 631
 632     # This test watches two words on most 32-bit ABIs, and one word on
 633     # most 64-bit ABIs.
 634
 635     # Platforms where the target can't watch such a large region
 636     # should clear hw_expected below.
 637     if { $no_hw || [target_info exists gdb,no_hardware_watchpoints]
 638          || [istarget arm*-*-*]
 639          || ([istarget powerpc*-*-*] && ![is_lp64_target])} {
 640         set hw_expected 0
 641     } else {
 642         set hw_expected 1
 643     }
 644
 645     gdb_breakpoint [gdb_get_line_number "func6 breakpoint here"]
 646     gdb_continue_to_breakpoint "func6 breakpoint here"
 647
 648     if { $hw_expected } {
 649         gdb_test "watch foo2" "Hardware watchpoint .*: .*" "watch foo2"
 650         gdb_test "continue" \
 651             "Continuing.*Hardware watchpoint .*: .*New value = \\\{val = \\\{0, 11\\\}\\\}.*" \
 652             "continue with watch foo2"
 653     } else {
 654         gdb_test "watch foo2" "atchpoint .*: .*" "watch foo2"
 655         set test "continue with watch foo2"
 656         gdb_test_multiple "cont" $test {
 657             -re "Continuing.*\[Ww\]atchpoint .*: .*New value = \\\{val = \\\{0, 11\\\}\\\}.*$gdb_prompt $" {
 658                 pass $test
 659             }
 660             -re "Could not insert hardware breakpoints:.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
 661                 # This may happen with remote targets that support
 662                 # hardware watchpoints.  We only find out the
 663                 # watchpoint was too large, for example, at insert
 664                 # time.  If GDB is ever adjusted to downgrade the
 665                 # watchpoint automatically in this case, this match
 666                 # should be removed.
 667                 pass $test
 668             }
 669         }
 670     }
 671
 672     gdb_test_no_output "delete \$bpnum" "delete watch foo2"
 673 }
 674
 675 proc test_wide_location_2 {} {
 676     global no_hw
 677     global gdb_prompt
 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          || [istarget arm*-*-*]
 686          || [istarget powerpc*-*-*]} {
 687         set hw_expected 0
 688     } else {
 689         set hw_expected 1
 690     }
 691
 692     gdb_breakpoint [gdb_get_line_number "func7 breakpoint here"]
 693     gdb_continue_to_breakpoint "func7 breakpoint here"
 694
 695     if { $hw_expected } {
 696         gdb_test "watch foo4" "Hardware watchpoint .*: .*" "watch foo4"
 697         gdb_test "continue" \
 698             "Continuing.*Hardware watchpoint .*: .*New value = \\\{val = \\\{0, 0, 0, 33\\\}\\\}.*" \
 699             "continue with watch foo4"
 700     } else {
 701         gdb_test "watch foo4" "atchpoint .*: .*" "watch foo4"
 702         set test "continue with watch foo4"
 703         gdb_test_multiple "cont" $test {
 704             -re "Continuing.*\[Ww\]atchpoint .*: .*New value = \\\{val = \\\{0, 0, 0, 33\\\}\\\}.*$gdb_prompt $" {
 705                 pass $test
 706             }
 707             -re "Could not insert hardware breakpoints:.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
 708                 # This may happen with remote targets that support
 709                 # hardware watchpoints.  We only find out the
 710                 # watchpoint was too large, for example, at insert
 711                 # time.  If GDB is ever adjusted to downgrade the
 712                 # watchpoint automatically in this case, this match
 713                 # should be removed.
 714                 pass $test
 715             }
 716         }
 717     }
 718
 719     gdb_test_no_output "delete \$bpnum" "delete watch foo4"
 720 }
 721
 722 proc test_inaccessible_watchpoint {} {
 723     global gdb_prompt
 724
 725     # This is a test for watchpoints on currently inaccessible (but later
 726     # valid) memory.
 727
 728     if [runto func4] then {
 729         # Make sure we only allow memory access errors.
 730         set msg "watchpoint refused to insert on nonexistent struct member"
 731         gdb_test_multiple "watch struct1.nosuchmember" $msg {
 732             -re ".*atchpoint \[0-9\]+: struct1.nosuchmember.*$gdb_prompt $" {
 733                 # PR breakpoints/9681
 734                 fail $msg
 735             }
 736             -re "There is no member named nosuchmember\\..*$gdb_prompt $" {
 737                 pass $msg
 738             }
 739         }
 740
 741         # See whether a watchpoint on a normal variable is a hardware
 742         # watchpoint or not.  The watchpoints on NULL should be hardware
 743         # iff this one is.
 744         set watchpoint_msg "Watchpoint"
 745         gdb_test_multiple "watch global_ptr" "watch global_ptr" {
 746             -re "Watchpoint \[0-9\]+: global_ptr\r\n.*$gdb_prompt $" {
 747                 pass "watch global_ptr"
 748             }
 749             -re "Hardware watchpoint \[0-9\]+: global_ptr\r\n.*$gdb_prompt $" {
 750                 set watchpoint_msg "Hardware watchpoint"
 751                 pass "watch global_ptr"
 752             }
 753         }
 754         delete_breakpoints
 755
 756         # Make sure that we can watch a constant address, and correctly
 757         # use a HW watchpoint if supported.
 758         gdb_test "watch *(int *) 0" \
 759             "$watchpoint_msg \[0-9\]+: \\*\\(int \\*\\) 0"
 760         delete_breakpoints
 761
 762         # The same, but using -location through an indirection.
 763         gdb_test "watch -location *global_ptr" \
 764             "$watchpoint_msg \[0-9\]+: \-location \\*global_ptr"
 765         delete_breakpoints
 766
 767         # This step requires two HW watchpoints.  Since some platforms only
 768         # have a single one, accept either SW or HW watchpoint in this case.
 769         if {[skip_hw_watchpoint_multi_tests]} {
 770             set watchpoint_msg "(Watchpoint|Hardware watchpoint)"
 771         }
 772
 773         gdb_test "watch *global_ptr" "$watchpoint_msg \[0-9\]+: \\\*global_ptr"
 774         gdb_test "set \$global_ptr_breakpoint_number = \$bpnum" ""
 775         gdb_test "next" ".*global_ptr = buf.*" "global_ptr next"
 776         gdb_test_multiple "next" "next over ptr init" {
 777             -re ".*atchpoint \[0-9\]+: \\*global_ptr\r\n\r\nOld value = .*\r\nNew value = 3 .*\r\n.*$gdb_prompt $" {
 778                 # We can not test for <unknown> here because NULL may be readable.
 779                 # This test does rely on *NULL != 3.
 780                 pass "next over ptr init"
 781             }
 782         }
 783         gdb_test_multiple "next" "next over buffer set" {
 784             -re ".*atchpoint \[0-9\]+: \\*global_ptr\r\n\r\nOld value = 3 .*\r\nNew value = 7 .*\r\n.*$gdb_prompt $" {
 785                 pass "next over buffer set"
 786             }
 787         }
 788         gdb_test "delete \$global_ptr_breakpoint_number" ""
 789         gdb_test "watch **global_ptr_ptr" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr"
 790         gdb_test "set \$global_ptr_ptr_breakpoint_number = \$bpnum" ""
 791         gdb_test "next" ".*global_ptr_ptr = &global_ptr.*" "global_ptr_ptr next"
 792         gdb_test "next" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr\[\r\n\]+Old value = .*\r\nNew value = 7 .*" "next over global_ptr_ptr init"
 793         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"
 794         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"
 795         gdb_test_no_output "delete \$global_ptr_ptr_breakpoint_number"
 796     }
 797 }
 798
 799 proc test_no_hw_watchpoints {} {
 800     global testfile
 801
 802     clean_restart $testfile
 803
 804     # Verify that a user can force GDB to use "slow" watchpoints.
 805     # (This proves rather little on kernels that don't support
 806     # fast watchpoints, but still...)
 807     #
 808     if ![runto_main] then { fail "watch tests suppressed" }
 809
 810     gdb_test_no_output "set can-use-hw-watchpoints 0" "disable fast watches"
 811
 812     gdb_test "show can-use-hw-watchpoints" \
 813         "Debugger's willingness to use watchpoint hardware is 0." \
 814         "show disable fast watches"
 815
 816     gdb_test "watch ival3 if  count > 1" \
 817         "Watchpoint \[0-9\]*: ival3.*" \
 818         "set slow conditional watch"
 819
 820     gdb_test "continue" \
 821         "Watchpoint \[0-9\]*: ival3.*Old value = 1.*New value = 2.*" \
 822         "trigger slow conditional watch"
 823
 824     gdb_test_no_output "delete \$bpnum" "delete watch ival3"
 825
 826     gdb_test "watch ival3 if  count > 1  thread 1 " \
 827          "Watchpoint \[0-9\]*: ival3.*" \
 828          "set slow condition watch w/thread"
 829
 830     gdb_test_no_output "delete \$bpnum" "delete watch w/condition and thread"
 831
 832     # We've explicitly disabled hardware watches.  Verify that GDB
 833     # refrains from using them.
 834     #
 835     gdb_test "rwatch ival3" \
 836         "Can't set read/access watchpoint when hardware watchpoints are disabled." \
 837         "rwatch disallowed when can-set-hw-watchpoints cleared"
 838     gdb_test "awatch ival3" \
 839         "Can't set read/access watchpoint when hardware watchpoints are disabled." \
 840         "awatch disallowed when can-set-hw-watchpoints cleared"
 841
 842
 843     # Re-enable hardware watchpoints if necessary.
 844     if ![target_info exists gdb,no_hardware_watchpoints] {
 845         gdb_test_no_output "set can-use-hw-watchpoints 1" ""
 846     }
 847 }
 848
 849 proc test_watchpoint_in_big_blob {} {
 850     global gdb_prompt
 851
 852     # On native targets where we do hardware resource accounting, this
 853     # may end up as a software watchpoint.
 854     set ok 0
 855     set test "watch buf"
 856     gdb_test_multiple "watch buf" $test {
 857         -re "Hardware watchpoint \[0-9\]+: buf.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
 858             # This may happen with remote targets (where we don't do
 859             # resource accounting) that support hardware watchpoints,
 860             # when breakpoint always-inserted is on.  The watchpoint
 861             # was too large, for example.  If GDB is ever adjusted to
 862             # downgrade the watchpoint automatically in this case,
 863             # this match should be removed.  Note the breakpoint has
 864             # been created, and is in the list, so it needs deleting.
 865             pass $test
 866         }
 867         -re ".*atchpoint \[0-9\]+: buf.*$gdb_prompt $" {
 868             pass $test
 869             set ok 1
 870         }
 871     }
 872
 873     if { $ok } {
 874         set test "watchpoint on buf hit"
 875         gdb_test_multiple "cont" $test {
 876             -re "Continuing.*atchpoint \[0-9\]+: buf\r\n\r\nOld value = .*testte\".*$gdb_prompt $" {
 877                 pass $test
 878             }
 879             -re "Could not insert hardware breakpoints:.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
 880                 # This may happen with remote targets that support
 881                 # hardware watchpoints.  We only find out the
 882                 # watchpoint was too large, for example, at insert
 883                 # time.  If GDB is ever adjusted to downgrade the
 884                 # watchpoint automatically in this case, this match
 885                 # should be removed.
 886                 pass $test
 887             }
 888         }
 889     }
 890
 891     gdb_test_no_output "delete \$bpnum" "delete watch buf"
 892 }
 893
 894 proc test_watch_register_location {} {
 895     global no_hw
 896
 897     if {!$no_hw && ![target_info exists gdb,no_hardware_watchpoints]} {
 898         # Non-memory read/access watchpoints are not supported, they would
 899         # require software read/access watchpoint support (which is not
 900         # currently available).
 901         gdb_test "rwatch \$pc" \
 902             "Expression cannot be implemented with read/access watchpoint..*" \
 903             "rwatch disallowed for register based expression"
 904         gdb_test "awatch \$pc" \
 905             "Expression cannot be implemented with read/access watchpoint..*" \
 906             "awatch disallowed for register based expression"
 907     }
 908 }
 909
 910 # Start with a fresh gdb.
 911
 912 set prev_timeout $timeout
 913 set timeout 600
 914 verbose "Timeout now 600 sec.\n"
 915
 916 test_no_hw_watchpoints
 917
 918 proc do_tests {} {
 919     global testfile
 920     global no_hw
 921
 922     clean_restart $testfile
 923
 924     if {$no_hw || [target_info exists gdb,no_hardware_watchpoints]} {
 925         gdb_test_no_output "set can-use-hw-watchpoints 0" ""
 926     }
 927
 928     if [initialize] then {
 929
 930         test_simple_watchpoint
 931
 932         test_disabling_watchpoints
 933
 934         if ![target_info exists gdb,cannot_call_functions] {
 935             test_stepping
 936         }
 937     }
 938
 939     # Tests below don't rely on the markers and watchpoint set by
 940     # `initialize' anymore.
 941     clean_restart $testfile
 942
 943     if {$no_hw || [target_info exists gdb,no_hardware_watchpoints]} {
 944         gdb_test_no_output "set can-use-hw-watchpoints 0" ""
 945     }
 946
 947     # Only enabled for some targets merely because it has not been tested
 948     # elsewhere.
 949     # On sparc-sun-sunos4.1.3, GDB was running all the way to the marker4
 950     # breakpoint before stopping for the watchpoint.  I don't know why.
 951     if {[istarget "hppa*-*-*"]} then {
 952         test_watchpoint_triggered_in_syscall
 953     }
 954
 955     test_complex_watchpoint
 956
 957     test_inaccessible_watchpoint
 958
 959     test_watchpoint_and_breakpoint
 960
 961     test_watchpoint_in_big_blob
 962
 963     test_constant_watchpoint
 964
 965     test_disable_enable_software_watchpoint
 966
 967     test_watch_location
 968
 969     test_wide_location_1
 970     test_wide_location_2
 971
 972     test_watch_register_location
 973 }
 974
 975 # On targets that can do hardware watchpoints, run the tests twice:
 976 # once with hardware watchpoints enabled; another with hardware
 977 # watchpoints force-disabled.
 978
 979 do_tests
 980 if ![target_info exists gdb,no_hardware_watchpoints] {
 981     with_test_prefix "no-hw" {
 982         set no_hw 1
 983         do_tests
 984     }
 985 }
 986
 987 # Restore old timeout
 988 set timeout $prev_timeout
 989 verbose "Timeout now $timeout sec.\n"