gdb/testsuite/gdb.threads/infcall-from-bp-cond-other-thread-event.exp

# Copyright 2022-2024 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 for conditional breakpoints where the breakpoint condition includes
# an inferior function call.
#
# The tests in this script are testing what happens when an event arrives in
# another thread while GDB is waiting for the inferior function call (in the
# breakpoint condition) to finish.
#
# The expectation is that GDB will queue events for other threads and wait
# for the inferior function call to complete, if the condition is true, then
# the conditional breakpoint should be reported first.  The other thread
# event should of course, not get lost, and should be reported as soon as
# the user tries to continue the inferior.
#
# If the conditional breakpoint ends up not being taken (the condition is
# false), then the other thread event should be reported immediately.
#
# This script tests what happens when the other thread event is (a) the
# other thread hitting a breakpoint, and (b) the other thread taking a
# signal (SIGSEGV in this case).

standard_testfile

if { [build_executable "failed to prepare" ${binfile} "${srcfile}" \
	  {debug pthreads}] == -1 } {
    return
}

set cond_bp_line [gdb_get_line_number "First thread breakpoint"]
set other_bp_line [gdb_get_line_number "Other thread breakpoint"]
set final_bp_line [gdb_get_line_number "Final breakpoint here"]
set signal_line [gdb_get_line_number "Signal here"]

# Start GDB based on TARGET_ASYNC and TARGET_NON_STOP, and then runto main.
proc start_gdb_and_runto_main { target_async target_non_stop } {
    save_vars { ::GDBFLAGS } {
	append ::GDBFLAGS \
	    " -ex \"maint set target-non-stop $target_non_stop\""
	append ::GDBFLAGS \
	    " -ex \"maintenance set target-async ${target_async}\""

	clean_restart ${::binfile}
    }

    if { ![runto_main] } {
	return -1
    }

    return 0
}

# Run a test of GDB's conditional breakpoints, where the conditions include
# inferior function calls.  While the inferior function call is executing
# another thread will hit a breakpoint (when OTHER_THREAD_SIGNAL is false),
# or receive a signal (when OTHER_THREAD_SIGNAL is true).  GDB should report
# the conditional breakpoint first (if the condition is true), and then
# report the second thread event once the inferior is continued again.
#
# When STOP_AT_COND is true then the conditional breakpoint will have a
# condition that evaluates to true (and GDB will stop at the breakpoint),
# otherwise, the condition will evaluate to false (and GDB will not stop at
# the breakpoint).
proc run_condition_test { stop_at_cond other_thread_signal \
			      target_async target_non_stop } {
    if { [start_gdb_and_runto_main $target_async \
	      $target_non_stop] == -1 } {
	return
    }

    # Setup the conditional breakpoint.
    if { $stop_at_cond } {
	set cond_func "condition_true_func"
    } else {
	set cond_func "condition_false_func"
    }
    gdb_breakpoint \
	"${::srcfile}:${::cond_bp_line} if (${cond_func} ())"
    set cond_bp_num [get_integer_valueof "\$bpnum" "*UNKNOWN*" \
			"get number for conditional breakpoint"]

    if { $other_thread_signal } {
	# Arrange for the other thread to raise a signal while GDB is
	# evaluating the breakpoint condition.
	gdb_test_no_output "set raise_signal = 1"
    } else {
	# And a breakpoint that will be hit by another thread only once the
	# breakpoint condition starts to be evaluated.
	gdb_breakpoint "${::srcfile}:${::other_bp_line}"
	set other_bp_num [get_integer_valueof "\$bpnum" "*UNKNOWN*" \
			      "get number for other breakpoint"]
    }

    # A final breakpoint once the test has completed.
    gdb_breakpoint "${::srcfile}:${::final_bp_line}"
    set final_bp_num [get_integer_valueof "\$bpnum" "*UNKNOWN*" \
			  "get number for final breakpoint"]

    if { $stop_at_cond } {
	# Continue.  The first breakpoint we hit should be the conditional
	# breakpoint.  The other thread will have hit its breakpoint, but
	# that will have been deferred until the conditional breakpoint is
	# reported.
	gdb_test "continue" \
	    [multi_line \
		 "Continuing\\." \
		 ".*" \
		 "" \
		 "Thread ${::decimal} \"\[^\"\r\n\]+\" hit Breakpoint ${cond_bp_num}, worker_func \[^\r\n\]+:${::cond_bp_line}" \
		 "${::decimal}\\s+\[^\r\n\]+First thread breakpoint\[^\r\n\]+"] \
	    "hit the conditional breakpoint"
    }

    if { $other_thread_signal } {
	# Now continue again, the other thread will now report that it
	# received a signal.
	gdb_test "continue" \
	    [multi_line \
		 "Continuing\\." \
		 ".*" \
		 "Thread ${::decimal} \"\[^\"\r\n\]+\" received signal SIGSEGV, Segmentation fault\\." \
		 "\\\[Switching to Thread \[^\r\n\]+\\\]" \
		 "${::hex} in worker_func \[^\r\n\]+:${::signal_line}" \
		 "${::decimal}\\s+\[^\r\n\]+Signal here\[^\r\n\]+"] \
	    "received signal in other thread"
    } else {
	# Now continue again, the other thread will now report its
	# breakpoint.
	gdb_test "continue" \
	    [multi_line \
		 "Continuing\\." \
		 ".*" \
		 "" \
		 "Thread ${::decimal} \"\[^\"\r\n\]+\" hit Breakpoint ${other_bp_num}, worker_func \[^\r\n\]+:${::other_bp_line}" \
		 "${::decimal}\\s+\[^\r\n\]+Other thread breakpoint\[^\r\n\]+"] \
	    "hit the breakpoint in other thread"

	# Run to the stop marker.
	gdb_test "continue" \
	    [multi_line \
		 "Continuing\\." \
		 ".*" \
		 "" \
		 "Thread ${::decimal} \"\[^\"\r\n\]+\" hit Breakpoint ${final_bp_num}, stop_marker \[^\r\n\]+:${::final_bp_line}" \
		 "${::decimal}\\s+\[^\r\n\]+Final breakpoint here\[^\r\n\]+"] \
	    "hit the final breakpoint"
    }

    gdb_exit
}

foreach_with_prefix target_async { "on" "off" } {
    foreach_with_prefix target_non_stop { "on" "off" } {
	foreach_with_prefix other_thread_signal { true false } {
	    foreach_with_prefix stop_at_cond { true false } {
		run_condition_test $stop_at_cond $other_thread_signal \
		    $target_async $target_non_stop
	    }
	}
    }
}