gdb/testsuite/gdb.base/watch-bitfields.exp

# Copyright 2014-2021 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/>.

# This file is part of the gdb testsuite

standard_testfile

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

# Set a watchpoint watching EXPR.
proc watch { expr } {
    global decimal

    set expr_re [string_to_regexp $expr]
    gdb_test "watch $expr" \
	"\(Hardware \)?\[Ww\]atchpoint $decimal: $expr_re"
}

# Continue inferior execution, expecting the watchpoint EXPR to be triggered
# having old value OLD and new value NEW.
proc expect_watchpoint { expr old new } {
    with_test_prefix "$expr: $old->$new" {
	set expr_re [string_to_regexp $expr]
	gdb_test "print $expr" "\\$\\d+ = $old\\s" "print expression before"
	gdb_test "continue" "$expr_re\\s.*Old value = $old\\s+New value = $new\\s.*"
	gdb_test "print $expr" "\\$\\d+ = $new\\s" "print expression after"
    }
}

# Check that -location watchpoints against bitfields trigger properly.
proc test_watch_location {} {
    with_test_prefix "-location watch against bitfields" {
	if {![runto_main]} {
	    return -1
	}

	watch "-location q.a"
	watch "-location q.e"
	expect_watchpoint "q.a" 0 1
	expect_watchpoint "q.e" 0 5
	expect_watchpoint "q.a" 1 0
	expect_watchpoint "q.e" 5 4

	# It'll execute a large amount of code with software watchpoint
	# enabled, which means GDB will single stepping all the way
	# through til the inferior exits.  Increase the timeout by a
	# factor of 4.
	with_timeout_factor 4 {
	    gdb_continue_to_end
	}
    }
}

# Check that regular watchpoints against expressions involving
# bitfields trigger properly.
proc test_regular_watch {} {
    with_test_prefix "regular watch against bitfields" {
	if {![runto_main]} {
	    return -1
	}

	watch "q.d + q.f + q.g"
	expect_watchpoint "q.d + q.f + q.g" 0 4
	expect_watchpoint "q.d + q.f + q.g" 4 10
	expect_watchpoint "q.d + q.f + q.g" 10 3
	expect_watchpoint "q.d + q.f + q.g" 3 2
	expect_watchpoint "q.d + q.f + q.g" 2 1
	expect_watchpoint "q.d + q.f + q.g" 1 0

	# It'll execute a large amount of code with software watchpoint
	# enabled, which means GDB will single stepping all the way
	# through til the inferior exits.  Increase the timeout by a
	# factor of 4.
	with_timeout_factor 4 {
	    gdb_continue_to_end
	}
    }
}

# Disable hardware watchpoints if the target does not support them.
if [target_info exists gdb,no_hardware_watchpoints] {
    gdb_test_no_output "set can-use-hw-watchpoints 0"
}

test_watch_location
test_regular_watch