gdb/testsuite/gdb.threads/watchthreads-reorder.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2
   3 # Copyright 2009-2013 Free Software Foundation, Inc.
   4
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 # Test GDB can cope with two watchpoints being hit by different threads at the
  19 # same time, GDB reports one of them and after "continue" to report the other
  20 # one GDB should not be confused by differently set watchpoints that time.
  21 # This is the goal of "reorder1".  "reorder0" tests the basic functionality of
  22 # two watchpoints being hit at the same time, without reordering them during the
  23 # stop.  The formerly broken functionality is due to the all-stop mode default
  24 # "show breakpoint always-inserted" being "off".  Formerly the remembered hit
  25 # could be assigned during continuation of a thread with pending SIGTRAP to the
  26 # different/new watchpoint, just based on the watchpoint/debug register number.
  27
  28 if {[skip_hw_watchpoint_access_tests]
  29     || [skip_hw_watchpoint_multi_tests]
  30     || ![istarget *-*-linux*]} {
  31     return 0
  32 }
  33
  34 standard_testfile
  35 if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" ${binfile} executable [list debug additional_flags=-lrt]] != "" } {
  36     return -1
  37 }
  38
  39 foreach reorder {0 1} { with_test_prefix "reorder$reorder" {
  40
  41     clean_restart $testfile
  42
  43     gdb_test "set can-use-hw-watchpoints 1"
  44
  45     if ![runto_main] {
  46         return -1
  47     }
  48
  49     # Use "rwatch" as "watch" would report the watchpoint changed just based on its
  50     # read memory value during a stop by unrelated event.  We are interested in not
  51     # losing the hardware watchpoint trigger.
  52
  53     gdb_test "rwatch thread1_rwatch" "Hardware read watchpoint \[0-9\]+: thread1_rwatch"
  54     set test "rwatch thread2_rwatch"
  55     gdb_test_multiple $test $test {
  56         -re "Target does not support this type of hardware watchpoint\\.\r\n$gdb_prompt $" {
  57             # ppc64 supports at most 1 hw watchpoints.
  58             unsupported $test
  59             return
  60         }
  61         -re "Hardware read watchpoint \[0-9\]+: thread2_rwatch\r\n$gdb_prompt $" {
  62             pass $test
  63         }
  64     }
  65     gdb_breakpoint [gdb_get_line_number "break-at-exit"]
  66
  67     # The watchpoints can happen in arbitrary order depending on random:
  68     # SEL: Found 2 SIGTRAP events, selecting #[01]
  69     # As GDB contains no srand() on the specific host/OS it will behave always the
  70     # same.  Such order cannot be guaranteed for GDB in general.
  71
  72     gdb_test "continue" \
  73              "Hardware read watchpoint \[0-9\]+: thread\[12\]_rwatch\r\n\r\nValue = 0\r\n0x\[0-9a-f\]+ in thread\[12\]_func .*" \
  74              "continue a"
  75
  76     if $reorder {
  77         # GDB orders watchpoints by their addresses so inserting new variables
  78         # with lower addresses will shift the former watchpoints to higher
  79         # debug registers.
  80
  81         gdb_test "rwatch unused1_rwatch" "Hardware read watchpoint \[0-9\]+: unused1_rwatch"
  82         gdb_test "rwatch unused2_rwatch" "Hardware read watchpoint \[0-9\]+: unused2_rwatch"
  83     }
  84
  85     gdb_test "continue" \
  86              "Hardware read watchpoint \[0-9\]+: thread\[12\]_rwatch\r\n\r\nValue = 0\r\n0x\[0-9a-f\]+ in thread\[12\]_func .*" \
  87              "continue b"
  88
  89     # While the debug output itself is not checked in this testcase one bug was
  90     # found in the DEBUG_INFRUN code path.
  91     gdb_test "set debug infrun 1"
  92
  93     gdb_continue_to_breakpoint "break-at-exit" ".*break-at-exit.*"
  94 }}