gdb/testsuite/gdb.threads/stepi-random-signal.exp

# Copyright 2013-2021 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Test relies on checking gdb debug output. Do not run if gdb debug is
# enabled as any debug will be redirected to the log.
if [gdb_debug_enabled] {
    untested "debug is enabled"
    return 0
}

standard_testfile
set executable ${testfile}

if { [gdb_compile_pthreads \
	  "${srcdir}/${subdir}/${srcfile}" \
	  "${binfile}" \
	  executable {debug}] != "" } {
    untested "failed to compile"
    return -1
}

clean_restart $executable

# Start the second thread.
if ![runto start] {
    return -1
}

# Go back to the main thread, and leave it in the loop, where we're
# reasonably sure we don't have 'conditional jmp $pc'-like
# instructions.  We wouldn't be able to detect whether a stepi makes
# progress over those.
gdb_test_no_output "set scheduler-locking on"
gdb_test "thread 1" "Switching to .*"
gdb_breakpoint $srcfile:[gdb_get_line_number "set break 2 here"]
gdb_continue_to_breakpoint "loop" ".* set break 2 here .*"

# Now back to thread 2, and let it queue a signal in thread 1.
gdb_test "thread 2" "Switching to .*"
gdb_breakpoint $srcfile:[gdb_get_line_number "set break here"]
gdb_continue_to_breakpoint "after pthread_kill" ".* set break here .*"

# We're now ready to stepi thread 1.  It should immediately dequeue
# the signal.
gdb_test "thread 1" "Switching to .*" "thread 1 again"

# No longer need these.
delete_breakpoints

# Turn on infrun debugging, so we can tell whether the signal is
# really dequeued and that GDB sees it.
gdb_test_no_output "set debug infrun 1"

# Make sure the target backend reports the signal to GDB core.  Some
# backends (like Linux) skip reporting a signal if set to
# pass/nostop/noprint, resuming the thread immediately instead.
gdb_test "handle SIGCHLD print"

# Helper to extract the current PC.  PREFIX is used to make each call
# have its own unique test name.

proc get_pc { prefix } {
    with_test_prefix "$prefix" {
	return [get_hexadecimal_valueof "\$pc" ""]
    }
}

set prev_addr [get_pc "before stepi"]
if {$prev_addr == ""} {
    return
}

# True if we saw the infrun path we want to test be exercised.
set seen 0

set test "stepi"
set prompt "$gdb_prompt \\\[infrun\\\] fetch_inferior_event: exit\r\n$"
if {[gdb_test_multiple "stepi" "$test" -prompt $prompt {
    -re {\[infrun\] handle_signal_stop: random signal} {
	set seen 1
	exp_continue
    }
    -re "$prompt$" {
    }
}] != 0} {
    return
}

if {$seen} {
    pass "$test"
} else {
    fail "$test (no random signal)"
}

set addr [get_pc "after stepi"]
if {$addr == ""} {
    return
}

set test "stepi interfered by signal makes progress"
if {$addr == $prev_addr} {
    fail "$test"
} else {
    pass "$test"
}