# Copyright (C) 2015-2020 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/>.

# This test spawns a few threads that constantly trip on a breakpoint
# that does not cause a user-visible stop.  While one of those
# breakpoints is being handled, the main thread exits the whole
# process.  The result is that the current thread for which GDB is
# handling the event disappears too and any attempt to access
# register/memory now errors out.  GDB and GDBserver should be able to
# handle this scenario gracefully.
#
# See https://sourceware.org/bugzilla/show_bug.cgi?id=18749

standard_testfile

set linenum [gdb_get_line_number "set break here"]

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

# The test proper.  If COND_BP_TARGET is true, then test with
# conditional breakpoints evaluated on the target side, if possible.

proc do_test { non_stop cond_bp_target } {
    global GDBFLAGS
    global gdb_prompt
    global binfile
    global linenum

    set saved_gdbflags $GDBFLAGS
    set GDBFLAGS [concat $GDBFLAGS " -ex \"set non-stop $non_stop\""]
    clean_restart $binfile
    set GDBFLAGS $saved_gdbflags

    if ![runto_main] then {
	fail "can't run to main"
	return 0
    }

    # Whether it's known that the test fails.
    set should_kfail 0

    if {![gdb_is_target_remote]} {
	set should_kfail 1
    } else {
	if {!$cond_bp_target} {
	    # Leaving breakpoint evaluation to GDB exposes failures
	    # similar to native debugging.
	    gdb_test_no_output "set remote conditional-breakpoints-packet off"
	    set should_kfail 1
	} else {
	    set test "show remote conditional-breakpoints-packet"
	    gdb_test_multiple $test $test {
		-re "currently enabled\.\r\n$gdb_prompt $" {
		    pass $test
		}
		-re "currently disabled\.\r\n$gdb_prompt $" {
		    unsupported "no support for target-side conditional breakpoints"
		    return
		}
	    }
	    set should_kfail 1
	}
    }

    gdb_test "break $linenum if zero == 1" \
	"Breakpoint .*" \
	"set breakpoint that evals false"

    set test "continue &"
    gdb_test_multiple $test $test {
	-re "$gdb_prompt " {
	    pass $test
	}
    }

    set ok 0

    # Setup the kfail upfront in order to also catch GDB internal
    # errors.
    if {$should_kfail} {
	setup_kfail "gdb/18749" "*-*-*"
    }

    set test "inferior 1 exited"
    gdb_test_multiple "" $test {
	-re "Inferior 1 \(\[^\r\n\]+\) exited normally" {
	    set ok 1

	    # Clear the kfail to avoid a PASS -> KPASS dance across
	    # runs.
	    clear_kfail "*-*-linux*"

	    pass $test
	}
	-re "$gdb_prompt " {
	    # Several errors end up at the top level, and printing the
	    # prompt.
	    fail "$test (prompt)"
	}
	-re "Cannot access memory" {
	    fail "$test (memory error)"
	}
	eof {
	    fail "$test (GDB died)"
	}
    }

    if {!$ok} {
	# No use testing further.
	return
    }

    gdb_test "info threads" "No threads\." \
	"no threads left"
}

foreach_with_prefix non_stop {"on" "off"} {
    foreach_with_prefix cond_bp_target {1 0} {
	do_test $non_stop $cond_bp_target
    }
}