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

   1 # This testcase is part of GDB, the GNU debugger.
   2
   3 # Copyright 2009-2012 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 set testfile "watchthreads-reorder"
  35 set srcfile ${testfile}.c
  36 set binfile ${objdir}/${subdir}/${testfile}
  37 if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" ${binfile} executable [list debug additional_flags=-lrt]] != "" } {
  38     return -1
  39 }
  40
  41 foreach reorder {0 1} { with_test_prefix " reorder$reorder:" {
  42
  43     clean_restart $testfile
  44
  45     gdb_test "set can-use-hw-watchpoints 1"
  46
  47     if ![runto_main] {
  48         return -1
  49     }
  50
  51     # Use "rwatch" as "watch" would report the watchpoint changed just based on its
  52     # read memory value during a stop by unrelated event.  We are interested in not
  53     # losing the hardware watchpoint trigger.
  54
  55     gdb_test "rwatch thread1_rwatch" "Hardware read watchpoint \[0-9\]+: thread1_rwatch"
  56     set test "rwatch thread2_rwatch"
  57     gdb_test_multiple $test $test {
  58         -re "Target does not support this type of hardware watchpoint\\.\r\n$gdb_prompt $" {
  59             # ppc64 supports at most 1 hw watchpoints.
  60             unsupported $test
  61             return
  62         }
  63         -re "Hardware read watchpoint \[0-9\]+: thread2_rwatch\r\n$gdb_prompt $" {
  64             pass $test
  65         }
  66     }
  67     gdb_breakpoint [gdb_get_line_number "break-at-exit"]
  68
  69     # The watchpoints can happen in arbitrary order depending on random:
  70     # SEL: Found 2 SIGTRAP events, selecting #[01]
  71     # As GDB contains no srand() on the specific host/OS it will behave always the
  72     # same.  Such order cannot be guaranteed for GDB in general.
  73
  74     gdb_test "continue" \
  75              "Hardware read watchpoint \[0-9\]+: thread\[12\]_rwatch\r\n\r\nValue = 0\r\n0x\[0-9a-f\]+ in thread\[12\]_func .*" \
  76              "continue a"
  77
  78     if $reorder {
  79         # GDB orders watchpoints by their addresses so inserting new variables
  80         # with lower addresses will shift the former watchpoints to higher
  81         # debug registers.
  82
  83         gdb_test "rwatch unused1_rwatch" "Hardware read watchpoint \[0-9\]+: unused1_rwatch"
  84         gdb_test "rwatch unused2_rwatch" "Hardware read watchpoint \[0-9\]+: unused2_rwatch"
  85     }
  86
  87     gdb_test "continue" \
  88              "Hardware read watchpoint \[0-9\]+: thread\[12\]_rwatch\r\n\r\nValue = 0\r\n0x\[0-9a-f\]+ in thread\[12\]_func .*" \
  89              "continue b"
  90
  91     # While the debug output itself is not checked in this testcase one bug was
  92     # found in the DEBUG_INFRUN code path.
  93     gdb_test "set debug infrun 1"
  94
  95     gdb_continue_to_breakpoint "break-at-exit" ".*break-at-exit.*"
  96 }}