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# This testcase is part of GDB, the GNU debugger.
# Copyright 2010-2023 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.
#
# Tests involving read watchpoints, and other kinds of watchpoints
# watching the same memory as read watchpoints.
#
standard_testfile .c
require !skip_hw_watchpoint_access_tests
if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
return -1
}
if {![runto_main]} {
return
}
set read_line [gdb_get_line_number "read line" $srcfile]
# Test running to a read of `global', with a read watchpoint set
# watching it.
gdb_test "rwatch global" \
"Hardware read watchpoint .*: global" \
"set hardware read watchpoint on global variable"
# The first read is on entry to the loop.
gdb_test "continue" \
"read watchpoint .*: global.*.*Value = 0.*in main.*$srcfile:$read_line.*" \
"read watchpoint triggers on first read"
# The second read happens on second loop iteration, after `global'
# having been incremented. On architectures where gdb has to emulate
# read watchpoints with access watchpoints, this tests the
# only-report-if-value-changed logic. On targets that support real
# read watchpoints, this tests that GDB ignores the watchpoint's old
# value, knowing that some untrapped write could have changed it, and
# so reports the read watchpoint unconditionally.
gdb_test "continue" \
"read watchpoint .*: global.*.*Value = 1.*in main.*$srcfile:$read_line.*" \
"read watchpoint triggers on read after value changed"
# The following tests check that when the user sets a write or access
# watchpoint watching the same memory as a read watchpoint, GDB also
# applies the only-report-if-value-changed logic even on targets that
# support real read watchpoints.
# The program should be stopped at the read line. Set a write
# watchpoint (leaving the read watchpoint) and continue. Only the
# write watchpoint should be reported as triggering.
gdb_test "watch global" \
"atchpoint .*: global" \
"set write watchpoint on global variable"
gdb_test "continue" \
"atchpoint .*: global.*Old value = 1.*New value = 2.*" \
"write watchpoint triggers"
set exp ""
set exp "${exp}2.*read watchpoint.*keep y.*global.*breakpoint already hit 2 times.*"
set exp "${exp}3.*watchpoint.*keep y.*global.*breakpoint already hit 1 time.*"
gdb_test "info watchpoints" \
"$exp" \
"only write watchpoint triggers when value changes"
# The program is now stopped at the write line. Continuing should
# stop at the read line, and only the read watchpoint should be
# reported as triggering.
gdb_test "continue" \
"read watchpoint .*: global.*Value = 2.*in main.*$srcfile:$read_line.*" \
"read watchpoint triggers when value doesn't change, trapping reads and writes"
set exp ""
set exp "${exp}2.*read watchpoint.*keep y.*global.*breakpoint already hit 3 times.*"
set exp "${exp}3.*watchpoint.*keep y.*global.*breakpoint already hit 1 time.*"
gdb_test "info watchpoints" \
"$exp" \
"only read watchpoint triggers when value doesn't change"
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