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# This testcase is part of GDB, the GNU debugger.

# Copyright 2010 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 .

# This file was written by Pedro Alves 

# This file is part of the gdb testsuite.

#

# Tests involving read watchpoints, and other kinds of watchpoints

# watching the same memory as read watchpoints.

#

set testfile "watch-read"

set srcfile ${testfile}.c

if { [target_info exists gdb,no_hardware_watchpoints] } {

    untested ${testfile}.exp

    return -1

}

if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {

    untested ${testfile}.exp

    return -1

}

if { ![runto main] } then {

    fail "run to 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"