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105 lines
3.7 KiB
Plaintext
105 lines
3.7 KiB
Plaintext
# This testcase is part of GDB, the GNU debugger.
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# Copyright 2010-2018 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This file is part of the gdb testsuite.
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#
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# Tests involving read watchpoints, and other kinds of watchpoints
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# watching the same memory as read watchpoints.
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#
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standard_testfile .c
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if {[skip_hw_watchpoint_access_tests]} {
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return 0
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}
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if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
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return -1
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}
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if { ![runto main] } then {
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fail "run to main"
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return
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}
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set read_line [gdb_get_line_number "read line" $srcfile]
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# Test running to a read of `global', with a read watchpoint set
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# watching it.
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gdb_test "rwatch global" \
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"Hardware read watchpoint .*: global" \
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"set hardware read watchpoint on global variable"
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# The first read is on entry to the loop.
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gdb_test "continue" \
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"read watchpoint .*: global.*.*Value = 0.*in main.*$srcfile:$read_line.*" \
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"read watchpoint triggers on first read"
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# The second read happens on second loop iteration, after `global'
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# having been incremented. On architectures where gdb has to emulate
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# read watchpoints with access watchpoints, this tests the
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# only-report-if-value-changed logic. On targets that support real
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# read watchpoints, this tests that GDB ignores the watchpoint's old
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# value, knowing that some untrapped write could have changed it, and
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# so reports the read watchpoint unconditionally.
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gdb_test "continue" \
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"read watchpoint .*: global.*.*Value = 1.*in main.*$srcfile:$read_line.*" \
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"read watchpoint triggers on read after value changed"
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# The following tests check that when the user sets a write or access
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# watchpoint watching the same memory as a read watchpoint, GDB also
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# applies the only-report-if-value-changed logic even on targets that
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# support real read watchpoints.
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# The program should be stopped at the read line. Set a write
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# watchpoint (leaving the read watchpoint) and continue. Only the
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# write watchpoint should be reported as triggering.
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gdb_test "watch global" \
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"atchpoint .*: global" \
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"set write watchpoint on global variable"
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gdb_test "continue" \
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"atchpoint .*: global.*Old value = 1.*New value = 2.*" \
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"write watchpoint triggers"
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set exp ""
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set exp "${exp}2.*read watchpoint.*keep y.*global.*breakpoint already hit 2 times.*"
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set exp "${exp}3.*watchpoint.*keep y.*global.*breakpoint already hit 1 time.*"
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gdb_test "info watchpoints" \
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"$exp" \
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"only write watchpoint triggers when value changes"
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# The program is now stopped at the write line. Continuing should
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# stop at the read line, and only the read watchpoint should be
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# reported as triggering.
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gdb_test "continue" \
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"read watchpoint .*: global.*Value = 2.*in main.*$srcfile:$read_line.*" \
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"read watchpoint triggers when value doesn't change, trapping reads and writes"
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set exp ""
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set exp "${exp}2.*read watchpoint.*keep y.*global.*breakpoint already hit 3 times.*"
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set exp "${exp}3.*watchpoint.*keep y.*global.*breakpoint already hit 1 time.*"
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gdb_test "info watchpoints" \
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"$exp" \
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"only read watchpoint triggers when value doesn't change"
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