binutils-gdb/gdb/testsuite/gdb.base/watchpoint.exp

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# Copyright (C) 1992 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 2 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, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
# Please email any bugs, comments, and/or additions to this file to:
# bug-gdb@prep.ai.mit.edu
# This file was written by Fred Fish. (fnf@cygnus.com)
if $tracelevel then {
strace $tracelevel
}
set prms_id 0
set bug_id 0
set binfile "watchpoint"
set srcfile $binfile.c
if ![file exists $objdir/$subdir/$binfile] then {
perror "$objdir/$subdir/$binfile does not exist."
return 0
}
# Prepare for watchpoint tests by setting up two breakpoints and one
# watchpoint.
#
# We use breakpoints at marker functions to get past all the startup code,
# so we can get to the watchpoints in a reasonable amount of time from a
# known starting point.
#
# For simplicity, so we always know how to reference specific breakpoints or
# watchpoints by number, we expect a particular ordering and numbering of
# each in the combined breakpoint/watchpoint table, as follows:
#
# Number What Where
# 1 Breakpoint marker1()
# 2 Breakpoint marker2()
# 3 Watchpoint ival3
proc initialize {} {
global prompt
global hex
global decimal
global srcfile
send "break marker1\n"
expect {
-re "Breakpoint 1 at $hex: file .*$srcfile, line $decimal.*$prompt $" {}
-re ".*$prompt $" { fail "set breakpoint at marker1" ; return 0 }
timeout { fail "set breakpoint at marker1 (timeout)" ; return 0 }
}
send "break marker2\n"
expect {
-re "Breakpoint 2 at $hex: file .*$srcfile, line $decimal.*$prompt $" {}
-re ".*$prompt $" { fail "set breakpoint at marker2" ; return 0 }
timeout { fail "set breakpoint at marker2 (timeout)" ; return 0 }
}
send "info break\n"
expect {
-re "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n$prompt $" { }
-re ".*$prompt $" { fail "breakpoints not setup right" ; return 0 }
timeout { fail "info break (timeout)" ; return 0 }
}
send "watch ival3\n"
expect {
-re ".*\[Ww\]atchpoint 3: ival3\r\n$prompt $" { pass "set watchpoint" }
-re ".*$prompt $" { fail "set watchpoint on ival3" ; return 0 }
timeout { fail "set watchpoint on ival3 (timeout)" ; return 0 }
}
# "info watch" is the same as "info break"
send "info watch\n"
expect {
-re "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n3\[ \]*.*watchpoint.*ival3\r\n$prompt $" {
pass "watchpoint found in watchpoint/breakpoint table"
}
-re ".*$prompt $" { fail "watchpoint/breakpoint not set" ; return 0 }
timeout { fail "info break (timeout)" ; return 0 }
}
# After installing the watchpoint, we disable it until we are ready
# to use it. This allows the test program to run at full speed until
# we get to the first marker function.
send "disable 3\n"
expect {
-re "disable 3\r\n$prompt $" { pass "watchpoint disabled" }
-re ".*$prompt $" { fail "watchpoint not disabled" ; return 0 }
timeout { fail "watchpoint not disabled (timeout)" ; return 0 }
}
return 1
}
#
# Test simple watchpoint.
#
proc test_simple_watchpoint {} {
global prompt
global hex
global decimal
# Ensure that the watchpoint is disabled when we startup.
send "disable 3\n"
expect {
-re "disable 3\r\n$prompt $" { }
-re ".*$prompt $" { fail "watchpoint not disabled" ; return 0 }
timeout { fail "watchpoint not disabled (timeout)" ; return 0 }
}
# Run until we get to the first marker function.
send "run\n"
expect {
-re "The program .* has been started already.* \(y or n\) $" {
send "y\n"
exp_continue
}
-re "Starting program.*Breakpoint 1, marker1 .*$prompt $" {}
-re ".*$prompt $" { fail "run until marker1 function hit" ; return }
timeout { fail "run until marker1 function hit (timeout)" ; return }
}
# After reaching the marker function, enable the watchpoint.
send "enable 3\n"
expect {
-re "enable 3\r\n$prompt $" { pass "watchpoint enabled" }
-re ".*$prompt $" { fail "watchpoint not enabled" ; return }
timeout { fail "watchpoint not enabled (timeout)" ; return }
}
gdb_test "break func1" "Breakpoint.*at"
gdb_test "set \\\$func1_breakpoint_number = \\\$bpnum" ""
gdb_test "continue" "Continuing.*Breakpoint \[0-9\]*, func1" \
"continue to breakpoint at func1"
# Continue until the first change, from -1 to 0
send "cont\n"
expect {
-re "Continuing.*Watchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*$prompt $" {
pass "watchpoint hit, first time"
}
-re "Continuing.*Watchpoint.*ival3.*Old value = -1.*New value = 0.*for .count = 0; count < 4; count\[+)\]+ \{.*$prompt $" {
# setup_xfail "m68*-*-sunos*" 1836
fail "missed first watchpoint"
return
}
-re "Continuing.*Breakpoint.*func1.*$prompt $" {
setup_xfail "m68*-*-*" 2597
fail "thought it hit breakpoint at func1 twice"
gdb_test "delete \\\$func1_breakpoint_number" ""
gdb_test "continue" "\
Continuing.*Watchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count;" \
"watchpoint hit, first time"
}
-re ".*$prompt $" { fail "missed first watchpoint" ; return }
timeout { fail "run to first watchpoint (timeout)" ; return }
eof { fail "run to first watchpoint (eof)" ; return }
}
gdb_test "delete \\\$func1_breakpoint_number" ""
# Continue until the next change, from 0 to 1.
send "cont\n"
expect {
-re "Continuing.*Watchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*$prompt $" {
pass "watchpoint hit, second time"
}
-re ".*$prompt $" { fail "missed second watchpoint" ; return }
timeout { fail "run to second watchpoint (timeout)" ; return }
}
# Continue until the next change, from 1 to 2.
send "cont\n"
expect {
-re "Continuing.*Watchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*$prompt $" {
pass "watchpoint hit, third time"
}
-re ".*$prompt $" { fail "missed third watchpoint" ; return }
timeout { fail "run to third watchpoint (timeout)" ; return }
}
# Continue until the next change, from 2 to 3.
send "cont\n"
expect {
-re "Continuing.*Watchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*$prompt $" {
pass "watchpoint hit, fourth time"
}
-re ".*$prompt $" { fail "missed fourth watchpoint" ; return }
timeout { fail "run to fourth watchpoint (timeout)" ; return }
}
# Continue until the next change, from 3 to 4.
# Note that this one is outside the loop.
send "cont\n"
expect {
-re "Continuing.*Watchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*$prompt $" {
pass "watchpoint hit, fifth time"
}
-re ".*$prompt $" { fail "missed fifth watchpoint" ; return }
timeout { fail "run to fifth watchpoint (timeout)" ; return }
}
# Continue until we hit the finishing marker function.
# Make sure we hit no more watchpoints.
# This used to fail for a29k-amd-udi (PR 2421), but has been fixed.
send "cont\n"
expect {
-re "Continuing.*Breakpoint.*marker2 \(\).*$prompt $" { }
-re "Continuing.*Watchpoint.*ival3.*$prompt $" {
fail "hit a disabled watchpoint" ; return
}
-re ".*$prompt $" { fail "marker2 function missed" ; return }
timeout { fail "run to marker2 function (timeout)" ; return }
}
# Disable the watchpoint so we run at full speed until we exit.
send "disable 3\n"
expect {
-re "disable 3\r\n$prompt $" { pass "watchpoint disabled" }
-re ".*$prompt $" { fail "watchpoint not disabled" ; return }
timeout { fail "watchpoint not disabled (timeout)" ; return }
}
# Run until process exits.
send "cont\n"
expect {
-re "Continuing.*Program exited normally.*$prompt $" { }
-re ".*$prompt $" { fail "watchpoints not removed" ; return }
timeout { fail "looking for process exit (timeout)" }
}
}
# Test disabling watchpoints.
proc test_disabling_watchpoints {} {
global prompt
global binfile
global srcfile
global decimal
global hex
# Ensure that the watchpoint is disabled when we startup.
send "disable 3\n"
expect {
-re "disable 3\r\n$prompt $" { }
-re ".*$prompt $" { fail "watchpoint not disabled" ; return 0 }
timeout { fail "watchpoint not disabled (timeout)" ; return 0 }
}
# Run until we get to the first marker function.
send "run\n"
expect {
-re "The program .* has been started already.* \(y or n\) $" {
send "y\n"
exp_continue
}
-re "Starting program.*Breakpoint 1, marker1 .*$prompt $" {}
-re ".*$prompt $" { fail "run until marker1 function hit" ; return }
timeout { fail "run until marker1 function hit (timeout)" ; return }
}
# After reaching the marker function, enable the watchpoint.
send "enable 3\n"
expect {
-re "enable 3\r\n$prompt $" { pass "watchpoint enabled" }
-re ".*$prompt $" { fail "watchpoint not enabled" ; return }
timeout { fail "watchpoint not enabled (timeout)" ; return }
}
# Continue until the first change, from -1 to 0
# Don't check the old value, because on VxWorks the variable value
# will not have been reinitialized.
send "cont\n"
expect {
-re "Continuing.*Watchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*$prompt $" {
pass "watchpoint hit, first time"
}
-re "Continuing.*Watchpoint.*ival3.*Old value = .*New value = 0.*for .count = 0; count < 4; count\[+)]+ \{.*$prompt $" {
# setup_xfail "m68*-*-sunos*" 1836
fail "missed first watchpoint"
return
}
-re ".*$prompt $" { fail "missed first watchpoint" ; return }
timeout { fail "run to first watchpoint (timeout)" ; return }
}
# Continue until the next change, from 0 to 1.
send "cont\n"
expect {
-re "Continuing.*Watchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*$prompt $" {
pass "watchpoint hit, second time"
}
-re ".*$prompt $" { fail "missed second watchpoint" ; return }
timeout { fail "run to second watchpoint (timeout)" ; return }
}
# Disable the watchpoint but leave breakpoints
send "disable 3\n"
expect {
-re "disable 3\r\n$prompt $" { }
-re ".*$prompt $" { fail "watchpoint not disabled" ; return 0 }
timeout { fail "watchpoint not disabled (timeout)" ; return 0 }
}
# Check watchpoint list, looking for the entry that confirms the
# watchpoint is disabled.
send "info watchpoints\n"
expect {
-re "3\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*$prompt $" {
pass "watchpoint disabled in table"
}
-re ".*$prompt $" {
fail "disabled watchpoint not found in table"
}
timeout { fail "info watchpoints (timeout)" }
}
# Continue until we hit the finishing marker function.
# Make sure we hit no more watchpoints.
send "cont\n"
expect {
-re "Continuing.*Breakpoint.*marker2 \[)(\]+.*$prompt $" {
pass "disabled watchpoint skipped"
}
-re "Continuing.*Watchpoint.*ival3.*$prompt $" {
fail "hit a disabled watchpoint" ; return
}
-re ".*$prompt $" { fail "marker2 function missed" ; return }
timeout { fail "run to marker2 function (timeout)" ; return }
}
send "cont\n"
expect {
-re "Continuing.*Program exited normally.*$prompt $" { }
-re ".*$prompt $" { fail "watchpoints not removed" ; return }
timeout { fail "looking for process exit (timeout)" }
}
}
# Test stepping and other mundane operations with watchpoints enabled
proc test_stepping {} {
global prompt
if [runto marker1] then {
gdb_test "watch ival2" ".*\[Ww\]atchpoint \[0-9\]*: ival2"
# Well, let's not be too mundane. It should be a *bit* of a challenge
gdb_test "break func2 if 0" "Breakpoint.*at"
gdb_test "p \\\$func2_breakpoint_number = \\\$bpnum" "="
# The HPPA has a problem here.
if [ istarget "hppa*-*-*" ] then {
# Don't actually try doing the call, if we do we can't continue.
setup_xfail "*-*-*"
fail "calling function with watchpoint enabled"
} else {
# The problem is that GDB confuses stepping through the call
# dummy with hitting the breakpoint at the end of the call dummy.
# Will be fixed once all architectures define
# CALL_DUMMY_BREAKPOINT_OFFSET.
setup_xfail "*-*-*"
# This doesn't occur if the call dummy starts with a call,
# because we are out of the dummy by the first time the inferior
# stops.
clear_xfail "m68*-*-*"
clear_xfail "i*86*-*-*"
clear_xfail "vax-*-*"
# The following architectures define CALL_DUMMY_BREAKPOINT_OFFSET.
clear_xfail "alpha-*-*"
clear_xfail "mips*-*-*"
clear_xfail "sparc-*-*"
gdb_test "p func1 ()" "= 73" \
"calling function with watchpoint enabled"
}
#
# "finish" brings us back to main.
# On some targets (e.g. alpha) gdb will stop from the finish in midline
# of the marker1 call. This is due to register restoring code on
# the alpha and might be caused by stack adjustment instructions
# on other targets. In this case we will step once more.
#
send "finish\n"
expect {
-re "Run.*exit from.*marker1.*main.* at" { }
default { fail "finish from marker1" ; return }
}
expect {
-re "marker1 \[)(\]+;.*$prompt $" {
send "step\n"
exp_continue
}
-re "func1 \[)(\]+;.*$prompt $" {
pass "finish from marker1"
}
-re ".*$prompt $" {
fail "finish from marker1"
}
default { fail "finish from marker1" ; return }
}
gdb_test "next" "for \[(\]+count = 0"
# Now test that "until" works. It's a bit tricky to test
# "until", because compilers don't always arrange the code
# exactly the same way, and we might get slightly different
# sequences of statements. But the following should be true
# (if not it is a compiler or a debugger bug): The user who
# does "until" at every statement of a loop should end up
# stepping through the loop once, and the debugger should not
# stop for any of the remaining iterations.
gdb_test "until" "ival1 = count"
gdb_test "until" "ival3 = count"
send "until\n"
expect {
-re "(for \[(\]+count = 0|\}).*$prompt $" {
gdb_test "until" "ival1 = count; /. Outside loop ./"
}
-re "ival1 = count; /. Outside loop ./.*$prompt $" {
pass "until out of loop"
}
-re ".*$prompt $" {
fail "until out of loop"
}
default { fail "until out of loop" ; return }
}
gdb_test "step" "ival2 = count"
}
}
# Test stepping and other mundane operations with watchpoints enabled
proc test_watchpoint_triggered_in_syscall {} {
global prompt
global timeout
set saved_timeout $timeout
# Run until we get to the first marker function.
set x 0
set y 0
set testname "Watch buffer passed to read syscall"
if [runto marker2] then {
gdb_test "watch buf\\\[0\\\]" ".*\[Ww\]atchpoint \[0-9\]*: buf"
gdb_test "watch buf\\\[1\\\]" ".*\[Ww\]atchpoint \[0-9\]*: buf"
gdb_test "watch buf\\\[2\\\]" ".*\[Ww\]atchpoint \[0-9\]*: buf"
gdb_test "watch buf\\\[3\\\]" ".*\[Ww\]atchpoint \[0-9\]*: buf"
gdb_test "watch buf\\\[4\\\]" ".*\[Ww\]atchpoint \[0-9\]*: buf"
gdb_test "break marker4" ".*Breakpoint.*"
send "set doread = 1\n"
expect {
-re ".*$prompt $" { }
timeout { fail "set doread" ; return }
}
# Sometimes our string never gets to GDB?!? dejagnu bug? Whatever
# the cause we'll set a reasonably short timeout and resend our
# string again if we timeout.
set timeout 10
send "continue\n"
send "123\n"
expect {
-re ".*Watchpoint.*buf\\\[0\\\].*Old value = 0.*New value = 49\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*Watchpoint.*buf\\\[1\\\].*Old value = 0.*New value = 50\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*Watchpoint.*buf\\\[2\\\].*Old value = 0.*New value = 51\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*Watchpoint.*buf\\\[3\\\].*Old value = 0.*New value = 10\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*$prompt $" { }
timeout {
set timeout $saved_timeout
send "123\n"
exp_continue
}
}
# Restore the timeout value.
set timeout $saved_timeout
# Examine the values in buf to see how many watchpoints we
# should have printed.
send "print buf\[0\]\n"
expect {
-re ".*= 49.*$prompt $" { set y [expr $y+1] }
-re ".*= 0" { }
default { fail "bogus value in buf[0]" }
timeout { fail "retrieving contents of buf variable (timeout) }
}
send "print buf\[1\]\n"
expect {
-re ".*= 50.*$prompt $" { set y [expr $y+1] }
-re ".*= 0" { }
default { fail "bogus value in buf[1]" }
timeout { fail "retrieving contents of buf variable (timeout) }
}
send "print buf\[2\]\n"
expect {
-re ".*= 51.*$prompt $" { set y [expr $y+1] }
-re ".*= 0" { }
default { fail "bogus value in buf[2]" }
timeout { fail "retrieving contents of buf variable (timeout) }
}
send "print buf\[3\]\n"
expect {
-re ".*= 10.*$prompt $" { set y [expr $y+1] }
-re ".*= 0" { }
default { fail "bogus value in buf[3]" }
timeout { fail "retrieving contents of buf variable (timeout) }
}
# Did we find what we were looking for? If not, flunk it.
if [expr $x==$y] then { pass $testname } else { fail "$testname: Only triggered $x watchpoints, expected $y."}
# Continue until we hit the finishing marker function.
# Make sure we hit no more watchpoints.
send "cont\n"
expect {
-re "Continuing.*Breakpoint.*marker4 \[)(\]+.*$prompt $" {
pass "disabled watchpoint skipped"
}
-re "Continuing.*Watchpoint.*$prompt $" {
fail "hit suprious watchpoint" ; return
}
-re ".*$prompt $" { fail "marker4 function missed" ; return }
timeout { fail "run to marker4 function (timeout)" ; return }
}
# Disable everything so we can finish the program at full speed
send "disable\n"
expect {
-re ".*$prompt $" { }
timeout { fail "disabling breakpoints (timeout)" }
}
send "cont\n"
expect {
-re "Continuing.*Program exited normally.*$prompt $" { }
-re ".*$prompt $" { fail "watchpoints not removed" ; return }
timeout { fail "looking for process exit (timeout)" }
}
}
}
# Do a simple test of of watching through a pointer when the pointer
# itself changes. Should add some more complicated stuff here.
proc test_complex_watchpoint {} {
global prompt
set testname "Test complex watchpoint"
if [runto marker4] then {
gdb_test "watch ptr1->val" ".*\[Ww\]atchpoint \[0-9\]*: ptr1->val"
gdb_test "break marker5" ".*Breakpoint.*"
send "cont\n"
expect {
-re "Continuing.*Watchpoint.*ptr1->val.*Old value = 1.*New value = 2.*$prompt $" { pass $testname }
default { fail $testname ; return }
}
# Continue until we hit the marker5 function.
# Make sure we hit no more watchpoints.
send "cont\n"
expect {
-re "Continuing.*Breakpoint.*marker5 \[)(\]+.*$prompt $" {
pass "did not trigger wrong watchpoint"
}
-re "Continuing.*Watchpoint.*$prompt $" {
fail "hit wrong watchpoint" ; return
}
-re ".*$prompt $" { fail "marker5 function missed" ; return }
timeout { fail "run to marker5 function (timeout)" ; return }
}
# Disable everything so we can finish the program at full speed
send "disable\n"
expect {
-re ".*$prompt $" { }
timeout { fail "disabling breakpoints (timeout)" }
}
send "cont\n"
expect {
-re "Continuing.*Program exited normally.*$prompt $" { }
-re ".*$prompt $" { fail "watchpoints not removed" ; return }
timeout { fail "looking for process exit (timeout)" }
}
}
}
# Start with a fresh gdb.
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load $objdir/$subdir/$binfile
if [initialize] then {
# Preserve the old timeout, and set a new one that should be
# sufficient to step from marker1 to marker2 with watchpoints
# set anywhere.
set timeoutsave $timeout
set timeout 60
test_simple_watchpoint
# The IDT/sim monitor only has 8 (!) open files, of which it uses
# 4 (!). So we have to make sure one program exits before
# starting another one.
if [istarget "mips-idt-*"] then {
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load $objdir/$subdir/$binfile
initialize
}
if [istarget "a29k-*-udi"] then {
# FIXME: If PR 2415 is fixed, this is not needed.
gdb_target_udi
gdb_load $objdir/$subdir/$binfile
}
test_disabling_watchpoints
# See above.
if [istarget "mips-idt-*"] then {
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load $objdir/$subdir/$binfile
initialize
}
test_stepping
# See above.
if [istarget "mips-idt-*"] then {
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load $objdir/$subdir/$binfile
initialize
}
# This test hasn't been tested on anything but the PA.
if [istarget "hppa*-*-*"] then {
test_watchpoint_triggered_in_syscall
}
# See above.
if [istarget "mips-idt-*"] then {
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load $objdir/$subdir/$binfile
initialize
}
# This test hasn't been tested on anything but the PA.
if [istarget "hppa*-*-*"] then {
test_complex_watchpoint
}
# Restore the preserved old timeout value.
set timeout $timeoutsave
}
if [istarget "a29k-*-udi"] then {
# FIXME: If PR 2415 is fixed, this is not needed.
gdb_target_udi
}