watch-bitfields.exp revision 1.6 
1# Copyright 2014-2019 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# This file is part of the gdb testsuite
17
18standard_testfile
19
20if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
21    return -1
22}
23
24# Set a watchpoint watching EXPR.
25proc watch { expr } {
26    global decimal
27
28    set expr_re [string_to_regexp $expr]
29    gdb_test "watch $expr" \
30	"\(Hardware \)?\[Ww\]atchpoint $decimal: $expr_re"
31}
32
33# Continue inferior execution, expecting the watchpoint EXPR to be triggered
34# having old value OLD and new value NEW.
35proc expect_watchpoint { expr old new } {
36    with_test_prefix "$expr: $old->$new" {
37	set expr_re [string_to_regexp $expr]
38	gdb_test "print $expr" "\\$\\d+ = $old\\s" "print expression before"
39	gdb_test "continue" "$expr_re\\s.*Old value = $old\\s+New value = $new\\s.*"
40	gdb_test "print $expr" "\\$\\d+ = $new\\s" "print expression after"
41    }
42}
43
44# Check that -location watchpoints against bitfields trigger properly.
45proc test_watch_location {} {
46    with_test_prefix "-location watch against bitfields" {
47	if {![runto_main]} {
48	    return -1
49	}
50
51	watch "-location q.a"
52	watch "-location q.e"
53	expect_watchpoint "q.a" 0 1
54	expect_watchpoint "q.e" 0 5
55	expect_watchpoint "q.a" 1 0
56	expect_watchpoint "q.e" 5 4
57
58	# It'll execute a large amount of code with software watchpoint
59	# enabled, which means GDB will single stepping all the way
60	# through til the inferior exits.  Increase the timeout by a
61	# factor of 4.
62	with_timeout_factor 4 {
63	    gdb_continue_to_end
64	}
65    }
66}
67
68# Check that regular watchpoints against expressions involving
69# bitfields trigger properly.
70proc test_regular_watch {} {
71    with_test_prefix "regular watch against bitfields" {
72	if {![runto_main]} {
73	    return -1
74	}
75
76	watch "q.d + q.f + q.g"
77	expect_watchpoint "q.d + q.f + q.g" 0 4
78	expect_watchpoint "q.d + q.f + q.g" 4 10
79	expect_watchpoint "q.d + q.f + q.g" 10 3
80	expect_watchpoint "q.d + q.f + q.g" 3 2
81	expect_watchpoint "q.d + q.f + q.g" 2 1
82	expect_watchpoint "q.d + q.f + q.g" 1 0
83
84	# It'll execute a large amount of code with software watchpoint
85	# enabled, which means GDB will single stepping all the way
86	# through til the inferior exits.  Increase the timeout by a
87	# factor of 4.
88	with_timeout_factor 4 {
89	    gdb_continue_to_end
90	}
91    }
92}
93
94# Disable hardware watchpoints if the target does not support them.
95if [target_info exists gdb,no_hardware_watchpoints] {
96    gdb_test_no_output "set can-use-hw-watchpoints 0"
97}
98
99test_watch_location
100test_regular_watch
101