gdb/testsuite/gdb.threads/forking-threads-plus-breakpoint.exp

   1 # Copyright (C) 2015-2016 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 test verifies that several threads forking while another thread
  17 # is constantly stepping over a breakpoint is properly handled.
  18
  19 standard_testfile
  20
  21 set linenum [gdb_get_line_number "set break here"]
  22
  23 if {[build_executable "failed to prepare" $testfile $srcfile {debug pthreads}] == -1} {
  24     return -1
  25 }
  26
  27 # Assume yes.
  28 set displaced_stepping_supported 1
  29
  30 # "set displaced on" only tells gdb to use displaced stepping if
  31 # possible.  Probe for actual support.
  32
  33 proc probe_displaced_stepping_support {} {
  34     global displaced_stepping_supported
  35     global binfile gdb_prompt
  36
  37     with_test_prefix "probe displaced-stepping support" {
  38         clean_restart $binfile
  39
  40         gdb_test_no_output "set displaced on"
  41         if ![runto_main] then {
  42             fail "Can't run to main"
  43             return 0
  44         }
  45
  46         # We're stopped at the main breakpoint.  If displaced stepping is
  47         # supported, we'll see related debug output while we step past
  48         # that breakpoint.
  49         gdb_test_no_output "set debug displaced 1"
  50         gdb_test_multiple "next" "probe" {
  51             -re "displaced pc to.*$gdb_prompt $" {
  52                 pass "supported"
  53             }
  54             -re ".*$gdb_prompt $" {
  55                 set displaced_stepping_supported 0
  56                 pass "not supported"
  57             }
  58         }
  59     }
  60 }
  61
  62 # The test proper.  If COND_BP_TARGET is true, then test with
  63 # conditional breakpoints evaluated on the target side, if possible.
  64 # DETACH_ON_FORK is used as value for the "set detach-on-fork"
  65 # setting.  If "on", this exercises GDB explicitly continuing the fork
  66 # child until exit.  If "off", this exercises GDB detaching the fork
  67 # child.  DISPLACED indicates whether to use displaced stepping or
  68 # not.
  69 proc do_test { cond_bp_target detach_on_fork displaced } {
  70     global GDBFLAGS
  71     global srcfile testfile binfile
  72     global decimal gdb_prompt
  73     global linenum
  74     global is_remote_target
  75
  76     set saved_gdbflags $GDBFLAGS
  77     set GDBFLAGS [concat $GDBFLAGS " -ex \"set non-stop on\""]
  78     clean_restart $binfile
  79     set GDBFLAGS $saved_gdbflags
  80
  81     if ![runto_main] then {
  82         fail "Can't run to main"
  83         return 0
  84     }
  85
  86     if {$cond_bp_target} {
  87         set test "set breakpoint condition-evaluation target"
  88         gdb_test_multiple $test $test {
  89             -re "warning: Target does not support breakpoint condition evaluation.\r\nUsing host evaluation mode instead.\r\n$gdb_prompt $" {
  90                 # Target doesn't support breakpoint condition
  91                 # evaluation on its side.  Skip the test.
  92                 return 0
  93             }
  94             -re "^$test\r\n$gdb_prompt $" {
  95             }
  96         }
  97     } else {
  98         gdb_test_no_output "set breakpoint condition-evaluation host"
  99     }
 100
 101     gdb_test_no_output "set detach-on-fork $detach_on_fork"
 102     gdb_test_no_output "set displaced $displaced"
 103
 104     gdb_test "break $linenum if zero == 1" \
 105         "Breakpoint .*" \
 106         "set breakpoint that evals false"
 107
 108     set test "continue &"
 109     gdb_test_multiple $test $test {
 110         -re "$gdb_prompt " {
 111             pass $test
 112         }
 113     }
 114
 115     set fork_count 0
 116     set ok 0
 117
 118     set test "inferior 1 exited"
 119     gdb_test_multiple "" $test {
 120         -re "Inferior 1 \(\[^\r\n\]+\) exited normally" {
 121             set ok 1
 122             pass $test
 123         }
 124         -re "Inferior $decimal \(\[^\r\n\]+\) exited normally" {
 125             incr fork_count
 126             if {$fork_count <= 100} {
 127                 exp_continue
 128             } else {
 129                 fail "$test (too many forks)"
 130             }
 131         }
 132     }
 133
 134     if {!$ok} {
 135         # No use testing further.
 136         return
 137     }
 138
 139     gdb_test "info threads" "No threads\." \
 140         "no threads left"
 141
 142     gdb_test "info inferiors" \
 143         "Num\[ \t\]+Description\[ \t\]+Executable\[ \t\]+\r\n\\* 1 \[^\r\n\]+" \
 144         "only inferior 1 left"
 145 }
 146
 147 probe_displaced_stepping_support
 148
 149 foreach_with_prefix cond_bp_target {1 0} {
 150     foreach_with_prefix detach_on_fork {"on" "off"} {
 151         # Disable "off" for now.  The test does pass with
 152         # detach-on-fork off (at the time of writing), but gdb seems
 153         # to slow down quadratically as inferiors are created, and
 154         # then the test takes annoyingly long to complete...
 155         if {$detach_on_fork == "off"} {
 156             continue
 157         }
 158
 159         foreach_with_prefix displaced {"on" "off"} {
 160             if {$displaced == "on" && !$displaced_stepping_supported} {
 161                 continue
 162             }
 163
 164             do_test $cond_bp_target $detach_on_fork $displaced
 165         }
 166     }
 167 }