1 # This testcase is part of GDB, the GNU debugger.
3 # Copyright 2010-2012 Free Software Foundation, Inc.
5 # This program is free software; you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation; either version 3 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
18 # This file was written by Pedro Alves <pedro@codesourcery.com>
20 # This file is part of the gdb testsuite.
23 # Tests involving read watchpoints, and other kinds of watchpoints
24 # watching the same memory as read watchpoints.
27 set testfile "watch-read"
28 set srcfile ${testfile}.c
30 if {[skip_hw_watchpoint_access_tests]} {
34 if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
35 untested ${testfile}.exp
39 if { ![runto main] } then {
44 set read_line [gdb_get_line_number "read line" $srcfile]
46 # Test running to a read of `global', with a read watchpoint set
49 gdb_test "rwatch global" \
50 "Hardware read watchpoint .*: global" \
51 "set hardware read watchpoint on global variable"
53 # The first read is on entry to the loop.
56 "read watchpoint .*: global.*.*Value = 0.*in main.*$srcfile:$read_line.*" \
57 "read watchpoint triggers on first read"
59 # The second read happens on second loop iteration, after `global'
60 # having been incremented. On architectures where gdb has to emulate
61 # read watchpoints with access watchpoints, this tests the
62 # only-report-if-value-changed logic. On targets that support real
63 # read watchpoints, this tests that GDB ignores the watchpoint's old
64 # value, knowing that some untrapped write could have changed it, and
65 # so reports the read watchpoint unconditionally.
68 "read watchpoint .*: global.*.*Value = 1.*in main.*$srcfile:$read_line.*" \
69 "read watchpoint triggers on read after value changed"
71 # The following tests check that when the user sets a write or access
72 # watchpoint watching the same memory as a read watchpoint, GDB also
73 # applies the only-report-if-value-changed logic even on targets that
74 # support real read watchpoints.
76 # The program should be stopped at the read line. Set a write
77 # watchpoint (leaving the read watchpoint) and continue. Only the
78 # write watchpoint should be reported as triggering.
80 gdb_test "watch global" \
81 "atchpoint .*: global" \
82 "set write watchpoint on global variable"
85 "atchpoint .*: global.*Old value = 1.*New value = 2.*" \
86 "write watchpoint triggers"
89 set exp "${exp}2.*read watchpoint.*keep y.*global.*breakpoint already hit 2 times.*"
90 set exp "${exp}3.*watchpoint.*keep y.*global.*breakpoint already hit 1 time.*"
91 gdb_test "info watchpoints" \
93 "only write watchpoint triggers when value changes"
95 # The program is now stopped at the write line. Continuing should
96 # stop at the read line, and only the read watchpoint should be
97 # reported as triggering.
100 "read watchpoint .*: global.*Value = 2.*in main.*$srcfile:$read_line.*" \
101 "read watchpoint triggers when value doesn't change, trapping reads and writes"
104 set exp "${exp}2.*read watchpoint.*keep y.*global.*breakpoint already hit 3 times.*"
105 set exp "${exp}3.*watchpoint.*keep y.*global.*breakpoint already hit 1 time.*"
106 gdb_test "info watchpoints" \
108 "only read watchpoint triggers when value doesn't change"