gdb/testsuite/gdb.threads/hand-call-in-threads.exp

   1 # Copyright (C) 2004-2020 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 # Test making hand function calls in multiple threads.
  17
  18 set NR_THREADS 4
  19
  20 standard_testfile
  21
  22 if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "additional_flags=-DNR_THREADS=$NR_THREADS"]] != "" } {
  23     return -1
  24 }
  25
  26 # Some targets can't do function calls, so don't even bother with this
  27 # test.
  28 if [target_info exists gdb,cannot_call_functions] {
  29     unsupported "this target can not call functions"
  30     continue
  31 }
  32
  33 proc get_dummy_frame_number { } {
  34     global gdb_prompt
  35
  36     gdb_test_multiple "bt" "" {
  37         -re "#(\[0-9\]*) *<function called from gdb>.*$gdb_prompt $" {
  38             return $expect_out(1,string)
  39         }
  40         -re "$gdb_prompt $" {
  41             return ""
  42         }
  43         timeout {
  44             return ""
  45         }
  46     }
  47     return ""
  48 }
  49
  50 clean_restart ${binfile}
  51
  52 if { ![runto_main] } {
  53     fail "can't run to main"
  54     return 0
  55 }
  56
  57 gdb_test "break all_threads_running" \
  58          "Breakpoint 2 at .*: file .*${srcfile}, line .*" \
  59          "breakpoint on all_threads_running"
  60
  61 gdb_test "break hand_call" \
  62          "Breakpoint 3 at .*: file .*${srcfile}, line .*" \
  63          "breakpoint on hand_call"
  64
  65 # Run the program and make sure GDB reports that we stopped after
  66 # hitting breakpoint 2 in all_threads_running().
  67
  68 gdb_test "continue" \
  69          ".*Breakpoint 2, all_threads_running ().*" \
  70          "run to all_threads_running"
  71
  72 # Before we start making hand function calls, turn on scheduler locking.
  73
  74 gdb_test_no_output "set scheduler-locking on" "enable scheduler locking"
  75 gdb_test "show scheduler-locking" ".* locking scheduler .* is \"on\"." "show scheduler locking on"
  76
  77 # Now hand-call a function in each thread, having the function
  78 # stop without returning.
  79
  80 # Add one for the main thread.
  81 set total_nr_threads [expr $NR_THREADS + 1]
  82
  83 # Thread numbering in gdb is origin-1, so begin numbering at 1.
  84 for { set i 1 } { $i <= $total_nr_threads } { incr i } {
  85     set thread_nr $i
  86     gdb_test "thread $thread_nr" \
  87         ".*Switching to thread $thread_nr.*" \
  88         "prepare to make hand call, thread $thread_nr"
  89     gdb_test_multiple "call hand_call()" "" {
  90         -re "Breakpoint 3, .*$gdb_prompt $" {
  91             pass "hand call, thread $thread_nr"
  92         }
  93         -re "$gdb_prompt $" {
  94             fail "hand call, thread $thread_nr (got gdb prompt)"
  95         }
  96         timeout {
  97             # If the target fails to stop at the breakpoint, it just ends
  98             # up in an infinite loop in hand_call().  If this happens
  99             # and we have lost the GDB prompt, no further tests in
 100             # this file will work and there is no point in continuing.
 101             fail "hand call, thread $thread_nr (runaway target)"
 102             return 0
 103         }
 104     }
 105 }
 106
 107 # Now have each hand-called function return.
 108
 109 # Turn confirmation off for the "return" command.
 110 gdb_test_no_output "set confirm off"
 111
 112 clear_xfail "*-*-*"
 113
 114 for { set i 1 } { $i <= $total_nr_threads } { incr i } {
 115     set thread_nr $i
 116     gdb_test "thread $thread_nr" ".*" \
 117         "prepare to discard hand call, thread $thread_nr"
 118     set frame_number [get_dummy_frame_number]
 119     if { "$frame_number" == "" } {
 120         fail "dummy stack frame number, thread $thread_nr"
 121         # Need something.
 122         set frame_number 0
 123     } else {
 124         pass "dummy stack frame number, thread $thread_nr"
 125     }
 126     # Pop the dummy frame.
 127     gdb_test "frame $frame_number" ".*" "setting frame, thread $thread_nr"
 128     gdb_test "return" ".*" "discard hand call, thread $thread_nr"
 129     # In case getting the dummy frame number failed, re-enable for next iter.
 130     clear_xfail "*-*-*"
 131 }
 132
 133 # Make sure all dummy frames got popped.
 134
 135 gdb_test_multiple "maint print dummy-frames" "all dummies popped" {
 136     -re ".*stack=.*$gdb_prompt $" {
 137         fail "all dummies popped"
 138     }
 139     -re ".*$gdb_prompt $" {
 140         pass "all dummies popped"
 141     }
 142 }
 143
 144 # Before we resume the full program, turn off scheduler locking.
 145 gdb_test_no_output "set scheduler-locking off" "disable scheduler locking"
 146 gdb_test "show scheduler-locking" ".* locking scheduler .* is \"off\"." "show scheduler locking off"
 147
 148 # Continue one last time, the program should exit normally.
 149 #
 150 # ??? This currently doesn't work because gdb doesn't know how to singlestep
 151 # over reported breakpoints that weren't in the last thread to run.
 152 # Commented out until then.
 153 #
 154 # For reference sake ...
 155 # An alternative is to manually work around the issue by manually setting
 156 # the thread back to the first thread: the program is still at the
 157 # all_threads_running breakpoint, which wasn't the last thread to run,
 158 # and gdb doesn't know how to singlestep over reported breakpoints that
 159 # weren't in the last thread to run.
 160 #gdb_test "thread 1" ".*" "set thread to 1, prepare to resume"
 161 #
 162 #gdb_continue_to_end "hand-call-in-threads"
 163
 164 return 0