gdb/testsuite/gdb.threads/watchthreads.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2
   3 # Copyright 2004-2018 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 # Check that GDB can support multiple watchpoints across threads.
  19
  20
  21 # This test verifies that a watchpoint is detected in the proper thread
  22 # so the test is only meaningful on a system with hardware watchpoints.
  23 if {[skip_hw_watchpoint_multi_tests]} {
  24     return 0
  25 }
  26
  27 proc target_no_stopped_data { } {
  28     return [istarget s390*-*-*]
  29 }
  30
  31 standard_testfile
  32 if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable debug] != "" } {
  33     return -1
  34 }
  35
  36 gdb_exit
  37 gdb_start
  38 gdb_reinitialize_dir $srcdir/$subdir
  39 gdb_load ${binfile}
  40
  41 gdb_test_no_output "set can-use-hw-watchpoints 1" ""
  42
  43 #
  44 # Run to `main' where we begin our tests.
  45 #
  46
  47 if ![runto_main] then {
  48     fail "can't run to main"
  49     return 0
  50 }
  51
  52 set args_0 0
  53 set args_1 0
  54
  55 # Watch values that will be modified by distinct threads.
  56 gdb_test "watch args\[0\]" "Hardware watchpoint 2: args\\\[0\\\]"
  57 gdb_test "watch args\[1\]" "Hardware watchpoint 3: args\\\[1\\\]"
  58 set hwwp_2_enabled 1
  59 set hwwp_3_enabled 1
  60
  61 set init_line [gdb_get_line_number "Init value"]
  62 set inc_line [gdb_get_line_number "Loop increment"]
  63 set main_loc "main \\\(\\\) at .*watchthreads.c:$init_line"
  64 set thread0_loc "thread_function \\\(arg=0x0\\\) at .*watchthreads.c:$inc_line"
  65 set thread1_loc "thread_function \\\(arg=0x1\\\) at .*watchthreads.c:$inc_line"
  66
  67 # Loop and continue to allow both watchpoints to be triggered.
  68 for {set i 0} {$i < 30} {incr i} {
  69   set test_flag_0 0
  70   set test_flag_1 0
  71   set test_flag 0
  72   gdb_test_multiple "continue" "threaded watch loop" {
  73     -re "(.*Hardware watchpoint.*)$gdb_prompt $" {
  74         # At least one hardware watchpoint was hit.  Check if both were.
  75         set string $expect_out(1,string)
  76
  77         if [regexp "Hardware watchpoint 2: args\\\[0\\\]\[^\r\]*\r\[^\r\]*\r\[^\r\]*Old value = $args_0\[^\r\]*\r\[^\r\]*New value = [expr $args_0+1]\r" $string] {
  78             incr args_0
  79             incr test_flag_0
  80         }
  81         if [regexp "Hardware watchpoint 3: args\\\[1\\\]\[^\r\]*\r\[^\r\]*\r\[^\r\]*Old value = $args_1\[^\r\]*\r\[^\r\]*New value = [expr $args_1+1]\r" $string] {
  82             incr args_1
  83             incr test_flag_1
  84         }
  85
  86         set expected_loc "bogus location"
  87         if { $test_flag_0 == 1 && $test_flag_1 == 0 && $args_0 == 1 } {
  88             set expected_loc $main_loc
  89         } elseif { $test_flag_0 == 0 && $test_flag_1 == 1 && $args_1 == 1 } {
  90             set expected_loc $main_loc
  91         } elseif { $test_flag_0 == 1 && $test_flag_1 == 0 } {
  92             set expected_loc $thread0_loc
  93         } elseif { $test_flag_0 == 0 && $test_flag_1 == 1 } {
  94             set expected_loc $thread1_loc
  95         } elseif { $test_flag_0 + $test_flag_1 == 2 } {
  96             # On S/390, or any other system which can not report the
  97             # stopped data address, it is OK to report two watchpoints
  98             # at once in this test.  Make sure the reported location
  99             # corresponds to at least one of the watchpoints (and not,
 100             # e.g., __nptl_create_event).  On other systems, we should
 101             # report the two watchpoints serially.
 102             if { [target_no_stopped_data] } {
 103                 set expected_loc "($main_loc|$thread0_loc|$thread1_loc)"
 104             }
 105         }
 106
 107         if [ regexp "$expected_loc" $string ] {
 108             set test_flag 1
 109         } else {
 110             fail "threaded watch loop"
 111         }
 112
 113         # If one of the watchpoints is disabled, we'd better not stop there.
 114         if { !$hwwp_2_enabled && $test_flag_0 } {
 115             fail "disabled hw watchpoint 2 triggered"
 116         }
 117         if { !$hwwp_3_enabled && $test_flag_1 } {
 118             fail "disabled hw watchpoint 3 triggered"
 119         }
 120
 121         # If we get to 10 in one of the watched locations disable it so we
 122         # see some of the other watched location.
 123         # 10 is chosen so we're guaranteed to come through here.
 124         if { $hwwp_2_enabled && $hwwp_3_enabled } {
 125             if { $args_0 >= 10 && $hwwp_2_enabled } {
 126                 gdb_test_no_output "disable 2" "disable first watchpoint at 10"
 127                 set hwwp_2_enabled 0
 128             } elseif { $args_1 >= 10 && $hwwp_3_enabled } {
 129                 gdb_test_no_output "disable 3" "disable first watchpoint at 10"
 130                 set hwwp_3_enabled 0
 131             }
 132         }
 133     }
 134   }
 135
 136   # If we fail above, don't bother continuing loop
 137   if { $test_flag == 0 } {
 138     set i 30
 139   }
 140 }
 141
 142 # Print success message if loop succeeded.
 143 if { $test_flag == 1 } {
 144   pass "threaded watch loop"
 145 }
 146
 147 # Verify that we hit first watchpoint in main thread.
 148 set message "first watchpoint on args\[0\] hit"
 149 if { $args_0 > 0 } {
 150   pass $message
 151 } else {
 152   fail $message
 153 }
 154
 155 # Verify that we hit second watchpoint in main thread.
 156 set message "first watchpoint on args\[1\] hit"
 157 if { $args_1 > 0 } {
 158   pass $message
 159 } else {
 160   fail $message
 161 }
 162
 163 # Verify that we hit first watchpoint in child thread.
 164 set message "watchpoint on args\[0\] hit in thread"
 165 if { $args_0 > 1 } {
 166   pass $message
 167 } else {
 168   fail $message
 169 }
 170
 171 # Verify that we hit second watchpoint in child thread.
 172 set message "watchpoint on args\[1\] hit in thread"
 173 if { $args_1 > 1 } {
 174   pass $message
 175 } else {
 176   fail $message
 177 }
 178
 179 # Verify that all watchpoint hits are accounted for.
 180 set message "combination of threaded watchpoints = 30"
 181 if { [target_no_stopped_data] } {
 182     # See above.  If we allow two watchpoints to be hit at once, we
 183     # may have more than 30 hits total.
 184     set result [expr $args_0 + $args_1 >= 30]
 185 } else {
 186     set result [expr $args_0 + $args_1 == 30]
 187 }
 188 if { $result } {
 189   pass $message
 190 } else {
 191   fail $message
 192 }