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reverse debugging update
- From: Michael Snyder <msnyder at vmware dot com>
- To: "gdb at sourceware dot org" <gdb at sourceware dot org>
- Cc: teawater at gmail dot com
- Date: Wed, 10 Sep 2008 19:04:19 -0700
- Subject: reverse debugging update
Just a check-in -- the work in the reverse debugging branch
is coming along nicely. We are to the point where we can
reverse-debug gdb from one command-prompt to another: that is,
we can run gdb under gdb, start recording when we're at the
command prompt, run a command (up to the next command
prompt), and then replay the entire execution sequence
from back to front and back again (breakpoints, reverse-
continue, reverse step/next, reverse-finish etc. all working).
Software watchpoints work too, though of course they're slow...
It would be nice if some of you would give it a try.
You can build it right out of the branch, then use it
to debug whatever gdb you're working on (as long as it
is i386-linux host).
Attached are some half-baked testsuites that it currently passes.
Branch label: reverse-20080717-branch
# Copyright 2008 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/>.
set testfile "break-reverse"
set srcfile ${testfile}.c
if { [prepare_for_testing break-reverse.exp $testfile $srcfile] } {
untested break-reverse.exp
return -1
}
global hex
global decimal
set foo_location [gdb_get_line_number "break in foo" ]
set bar_location [gdb_get_line_number "break in bar" ]
set main_location [gdb_get_line_number "break in main"]
runto main
# FIXME 'record' command should say something so we know it's working.
gdb_test "record" "" "start recording"
gdb_test "break foo" \
"Breakpoint $decimal at .* line $foo_location\." \
"set breakpoint on foo"
gdb_test "break bar" \
"Breakpoint $decimal at .* line $bar_location\." \
"set breakpoint on bar"
gdb_continue_to_breakpoint "foo" ".*/$srcfile:$foo_location.*"
gdb_continue_to_breakpoint "bar" ".*/$srcfile:$bar_location.*"
# FIXME 'set exec-dir' command should give some output so we can test.
gdb_test "set exec-direction reverse" "" "set reverse"
gdb_continue_to_breakpoint "foo" ".*/$srcfile:$foo_location.*"
gdb_continue_to_breakpoint "main" ".*/$srcfile:$main_location.*"
gdb_test "set exec-direction forward" "" "set forward"
gdb_continue_to_breakpoint "foo" ".*/$srcfile:$foo_location.*"
gdb_continue_to_breakpoint "bar" ".*/$srcfile:$bar_location.*"
# Copyright 2008 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/>.
# Please email any bugs, comments, and/or additions to this file to:
# bug-gdb@prep.ai.mit.edu
set testfile "finish-reverse"
set srcfile ${testfile}.c
if { [prepare_for_testing return2-reverse.exp "$testfile" $srcfile] } {
untested finish-reverse.exp
return -1
}
global hex
global decimal
proc test_start_of_line { line_text test_msg } {
global gdb_prompt
global decimal
global hex
send_gdb "info line\n"
gdb_expect {
-re "Line $decimal of .* starts at address ($hex) .*$gdb_prompt $" {
set line_begin $expect_out(1,string)
}
default {
fail "Get line address in test_start_of_line"
}
}
send_gdb "info reg pc\n"
gdb_expect {
-re ".*: ($hex)\r\n*$gdb_prompt $" {
set stop_pc $expect_out(1,string)
}
default {
fail"Get stop pc in test_start_of_line"
}
}
gdb_test "print $line_begin == $stop_pc" \
" = 1\[\r\n\]*" \
"test_start_of_line, $test_msg"
}
runto main
# FIXME 'record' command should say something so we know it's working.
gdb_test "record" "" "start recording"
# Test finish from void func
set breakloc [gdb_get_line_number "VOID FUNC" "$srcfile"]
gdb_test "break void_func" \
"Breakpoint $decimal at .*/$srcfile, line $breakloc\." \
"set breakpoint on void_func"
gdb_continue_to_breakpoint "void_func" ".*/$srcfile:$breakloc.*"
set test_msg "finish from void_func"
gdb_test_multiple "finish" "$test_msg" {
-re " call to void_func .*$gdb_prompt $" {
send_gdb "step\n"
exp_continue
}
-re " void_checkpoint .*$gdb_prompt $" {
pass "$test_msg"
}
}
# Test finish from char func
set breakloc [gdb_get_line_number "CHAR FUNC" "$srcfile"]
gdb_test "break char_func" \
"Breakpoint $decimal at .*/$srcfile, line $breakloc\." \
"set breakpoint on char_func"
gdb_continue_to_breakpoint "char_func" ".*/$srcfile:$breakloc.*"
set test_msg "finish from char_func"
gdb_test_multiple "finish" "$test_msg" {
-re " void_checkpoint .*$gdb_prompt $" {
send_gdb "step\n"
exp_continue
}
-re " char_checkpoint .*$gdb_prompt $" {
pass "$test_msg"
}
}
# Test finish from short func
set breakloc [gdb_get_line_number "SHORT FUNC" "$srcfile"]
gdb_test "break short_func" \
"Breakpoint $decimal at .* line $breakloc\." \
"set breakpoint on short_func"
gdb_continue_to_breakpoint "short_func" ".*/$srcfile:$breakloc.*"
set test_msg "finish from short_func"
gdb_test_multiple "finish" "$test_msg" {
-re " char_checkpoint .*$gdb_prompt $" {
send_gdb "step\n"
exp_continue
}
-re " short_checkpoint .*$gdb_prompt $" {
pass "$test_msg"
}
}
# Test finish from int func
set breakloc [gdb_get_line_number "INT FUNC" "$srcfile"]
gdb_test "break int_func" \
"Breakpoint $decimal at .* line $breakloc\." \
"set breakpoint on int_func"
gdb_continue_to_breakpoint "int_func" ".*/$srcfile:$breakloc.*"
set test_msg "finish from int_func"
gdb_test_multiple "finish" "$test_msg" {
-re " short_checkpoint .*$gdb_prompt $" {
send_gdb "step\n"
exp_continue
}
-re " int_checkpoint .*$gdb_prompt $" {
pass "$test_msg"
}
}
# Test finish from long func
set breakloc [gdb_get_line_number "LONG FUNC" "$srcfile"]
gdb_test "break long_func" \
"Breakpoint $decimal at .* line $breakloc\." \
"set breakpoint on long_func"
gdb_continue_to_breakpoint "long_func" ".*/$srcfile:$breakloc.*"
set test_msg "finish from long_func"
gdb_test_multiple "finish" "$test_msg" {
-re " int_checkpoint .*$gdb_prompt $" {
send_gdb "step\n"
exp_continue
}
-re " long_checkpoint .*$gdb_prompt $" {
pass "$test_msg"
}
}
# Test finish from long long func
set breakloc [gdb_get_line_number "LONG LONG FUNC" "$srcfile"]
gdb_test "break long_long_func" \
"Breakpoint $decimal at .* line $breakloc\." \
"set breakpoint on long_long_func"
gdb_continue_to_breakpoint "long_long_func" ".*/$srcfile:$breakloc.*"
set test_msg "finish from long_long_func"
gdb_test_multiple "finish" "$test_msg" {
-re " long_checkpoint .*$gdb_prompt $" {
send_gdb "step\n"
exp_continue
}
-re " long_long_checkpoint .*$gdb_prompt $" {
pass "$test_msg"
}
}
###
###
###
# Now switch to reverse
gdb_test "set exec-dir reverse" "" "set reverse execution"
# Test reverse finish from long long func
set breakloc [gdb_get_line_number "LONG LONG FUNC" "$srcfile"]
gdb_continue_to_breakpoint "long_long_func" ".*/$srcfile:$breakloc.*"
set test_msg "reverse finish from long_long_func"
gdb_test_multiple "finish" "$test_msg" {
-re ".* long_checkpoint.*$gdb_prompt $" {
test_start_of_line "long_checkpoint" "$test_msg"
}
}
# Test reverse finish from long func
set breakloc [gdb_get_line_number "LONG FUNC" "$srcfile"]
gdb_continue_to_breakpoint "long_func" ".*/$srcfile:$breakloc.*"
set test_msg "reverse finish from long_func"
gdb_test_multiple "finish" "$test_msg" {
-re ".* int_checkpoint.*$gdb_prompt $" {
test_start_of_line "int_checkpoint" "$test_msg"
}
}
# Test reverse finish from int func
set breakloc [gdb_get_line_number "INT FUNC" "$srcfile"]
gdb_continue_to_breakpoint "int_func" ".*/$srcfile:$breakloc.*"
set test_msg "reverse finish from int_func"
gdb_test_multiple "finish" "$test_msg" {
-re ".* short_checkpoint.*$gdb_prompt $" {
test_start_of_line "short_checkpoint" "$test_msg"
}
}
# Test reverse finish from short func
set breakloc [gdb_get_line_number "SHORT FUNC" "$srcfile"]
gdb_continue_to_breakpoint "short_func" ".*/$srcfile:$breakloc.*"
set test_msg "reverse finish from short_func"
gdb_test_multiple "finish" "$test_msg" {
-re ".* char_checkpoint.*$gdb_prompt $" {
test_start_of_line "char_checkpoint" "$test_msg"
}
}
# Test reverse finish from char func
set breakloc [gdb_get_line_number "CHAR FUNC" "$srcfile"]
gdb_continue_to_breakpoint "char_func" ".*/$srcfile:$breakloc.*"
set test_msg "reverse finish from char_func"
gdb_test_multiple "finish" "$test_msg" {
-re ".* void_checkpoint.*$gdb_prompt $" {
test_start_of_line "void_checkpoint" "$test_msg"
}
}
# Test reverse finish from void func
set breakloc [gdb_get_line_number "VOID FUNC" "$srcfile"]
gdb_continue_to_breakpoint "void_func" ".*/$srcfile:$breakloc.*"
set test_msg "reverse finish from void_func"
gdb_test_multiple "finish" "$test_msg" {
-re ".* call to void_func.*$gdb_prompt $" {
test_start_of_line "call to void_func" "$test_msg"
}
}
return 0
# This testcase is part of GDB, the GNU debugger.
# Copyright 2008 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/>. */
# step-reverse.exp -- Expect script to test reverse stepping in gdb.
# Lots of code borrowed from "step-test.exp".
set testfile "step-reverse"
set srcfile ${testfile}.c
if { [prepare_for_testing step-reverse.exp $testfile $srcfile] } {
untested step-reverse.exp
return -1
}
global hex
global decimal
runto main
# Activate record/replay
# FIXME: command needs to acknowledge, so we can test if it succeeded.
gdb_test "record" "" "Turn on recording"
# plain vanilla step/next (no count)
gdb_test "next" ".*NEXT TEST 1.*" "next test 1"
gdb_test "step" ".*STEP TEST 1.*" "step test 1"
# step/next with count
gdb_test "next 2" ".*NEXT TEST 2.*" "next test 2"
gdb_test "step 3" ".*STEP TEST 2.*" "step test 2"
# step over call
gdb_test "step" ".*NEXT OVER THIS CALL.*" "step up to call"
gdb_test "next" ".*STEP INTO THIS CALL.*" "next over call"
# step into call
gdb_test "step" ".*ARRIVED IN CALLEE.*" "step into call"
# finish out of call
set test_message "finish out of fn call"
gdb_test_multiple "finish" "$test_message" {
-re "FINISH TEST.*$gdb_prompt $" {
pass "$test_message"
}
-re "STEP INTO THIS CALL.*$gdb_prompt $" {
send_gdb "step\n"
exp_continue
}
}
# stepi over flat code (no calls)
set test_message "simple stepi"
gdb_test_multiple "stepi" "$test_message" {
-re "STEPI TEST.*$gdb_prompt $" {
pass "$test_message"
}
-re "FINISH TEST.*$gdb_prompt $" {
send_gdb "stepi\n"
exp_continue
}
-re "NEXTI TEST.*$gdb_prompt $" {
fail "$test_message (too far)"
}
}
# stepi into a function call
set test_message "stepi into function call"
gdb_test_multiple "stepi" "$test_message" {
-re "ARRIVED IN CALLEE.*$gdb_prompt $" {
pass "$test_message"
}
-re "NEXTI TEST.*$gdb_prompt $" {
fail "$test_message (too far)"
}
-re "RETURN FROM CALLEE.*$gdb_prompt $" {
fail "$test_message (too far)"
}
-re "ENTER CALLEE.*$gdb_prompt $" {
send_gdb "stepi\n"
exp_continue
}
}
# stepi thru return of a function call
set test_message "stepi back from function call"
gdb_test_multiple "stepi" "$test_message" {
-re "NEXTI TEST.*$gdb_prompt $" {
pass "$test_message"
}
-re "ARRIVED IN CALLEE.*$gdb_prompt $" {
send_gdb "stepi\n"
exp_continue
}
-re "RETURN FROM CALLEE.*$gdb_prompt $" {
send_gdb "stepi\n"
exp_continue
}
-re "STEPI TEST.*$gdb_prompt $" {
send_gdb "stepi\n"
exp_continue
}
-re "ENTER CALLEE.*$gdb_prompt $" {
fail "$test_message (too far)"
}
}
###
###
###
# Set reverse execution direction
# FIXME: command needs to acknowledge, so we can test if it succeeded.
gdb_test "set exec-dir reverse" "" "set reverse execution"
# stepi backward thru return and into a function
set stepi_location [gdb_get_line_number "ARRIVED IN CALLEE" "$srcfile"]
set test_message "reverse stepi thru function return"
gdb_test_multiple "stepi" "$test_message" {
-re "NEXTI TEST.*$gdb_prompt $" {
fail "$test_message (start statement)"
}
-re "RETURN FROM CALLEE.*$gdb_prompt $" {
send_gdb "stepi\n"
exp_continue
}
-re "$hex\[ \t\]*$stepi_location.*ARRIVED IN CALLEE.*$gdb_prompt $" {
send_gdb "stepi\n"
exp_continue
}
-re "ARRIVED IN CALLEE.*$gdb_prompt $" {
pass "$test_message"
}
-re "ENTER CALLEE.*$gdb_prompt $" {
fail "$test_message (too far)"
}
-re "STEPI TEST.*$gdb_prompt $" {
fail "$test_message (too far)"
}
}
# stepi backward out of a function call
set stepi_location [gdb_get_line_number "FINISH TEST" "$srcfile"]
set test_message "reverse stepi from a function call"
gdb_test_multiple "stepi" "$test_message" {
-re "ARRIVED IN CALLEE.*$gdb_prompt $" {
fail "$test_message (start statement)"
}
-re "ENTER CALLEE.*$gdb_prompt $" {
send_gdb "stepi\n"
exp_continue
}
-re "${hex}\[ \t\]*$stepi_location.*STEPI TEST.*$gdb_prompt $" {
send_gdb "stepi\n"
exp_continue
}
-re "STEPI TEST.*$gdb_prompt $" {
pass "$test_message"
}
-re "STEP INTO THIS CALL.*$gdb_prompt $" {
fail "$test_message (too far)"
}
}
# stepi backward over flat code (no calls)
set stepi_location [gdb_get_line_number "FINISH TEST" "$srcfile"]
set test_message "simple reverse stepi"
gdb_test_multiple "stepi" "$test_message" {
-re "STEPI TEST.*$gdb_prompt $" {
fail "$test_message (start statement)"
}
-re "$hex\[ \t\]*$stepi_location.* FINISH TEST.*$gdb_prompt $" {
send_gdb "stepi\n"
exp_continue
}
-re "$stepi_location.* FINISH TEST.*$gdb_prompt $" {
pass "$test_message"
}
-re "STEP INTO THIS CALL.*$gdb_prompt $" {
fail "$test_message (too far)"
}
}
# step backward into function (thru return)
set test_message "reverse step into fn call"
gdb_test_multiple "step" "$test_message" {
-re "RETURN FROM CALLEE.*$gdb_prompt $" {
send_gdb "step\n"
exp_continue
}
-re "ARRIVED IN CALLEE.*$gdb_prompt $" {
pass "$test_message"
}
}
# step backward out of called function (thru call)
gdb_test "step" ".*STEP INTO THIS CALL.*" "reverse step out of called fn"
# next backward over call
gdb_test "next" ".*NEXT OVER THIS CALL.*" "reverse next over call"
# step/next backward with count
gdb_test "step 3" ".*REVERSE STEP TEST 1.*" "reverse step test 1"
gdb_test "next 2" ".*REVERSE NEXT TEST 1.*" "reverse next test 1"
# step/next backward without count
gdb_test "step" ".*STEP TEST 1.*" "reverse step test 2"
gdb_test "next" ".*NEXT TEST 1.*" "reverse next test 2"
# Finish test by running forward to the end.
# FIXME return to this later...
# gdb_test "set exec-dir forward" "" "set forward execution"
# gdb_continue_to_end "step-reverse.exp"
return 0
# Copyright 2008 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/>. */
# Please email any bugs, comments, and/or additions to this file to:
# bug-gdb@prep.ai.mit.edu
# until-reverse.exp -- Expect script to test 'until' in gdb
set testfile "until-reverse"
set srcfile ${testfile}.c
set srcfile1 ${testfile}1.c
set binfile ${objdir}/${subdir}/${testfile}
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}0.o" object {debug nowarnings}] != "" } {
untested until-reverse.exp
return -1
}
if { [gdb_compile "${srcdir}/${subdir}/${srcfile1}" "${binfile}1.o" object {debug nowarnings}] != "" } {
untested until-reverse.exp
return -1
}
if { [gdb_compile "${binfile}0.o ${binfile}1.o" "${binfile}" executable {debug nowarnings}] != "" } {
untested until-reverse.exp
return -1
}
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}
set bp_location1 [gdb_get_line_number "set breakpoint 1 here"]
set bp_location7 [gdb_get_line_number "set breakpoint 7 here"]
set bp_location9 [gdb_get_line_number "set breakpoint 9 here" "$srcfile1"]
set bp_location19 [gdb_get_line_number "set breakpoint 19 here"]
set bp_location20 [gdb_get_line_number "set breakpoint 20 here"]
set bp_location21 [gdb_get_line_number "set breakpoint 21 here"]
if ![runto_main] then {
fail "Can't run to main"
untested "until-reverse.exp"
return 0
}
# Activate record/replay
# FIXME: command needs to acknowledge, so we can test if it succeeded.
gdb_test "record" "" "Turn on recording"
# Verify that plain vanilla "until <location>" works.
#
gdb_test "until $bp_location1" \
"main .* at .*:$bp_location1.*" \
"until line number"
# Advance up to factorial, outer invocation
#
gdb_test "advance factorial" \
"factorial .value=6..*$srcfile:$bp_location7.*" \
"advance to factorial"
# At this point, 'until' should continue the inferior up to when all the
# inner invocations of factorial() are completed and we are back at this
# frame.
#
gdb_test "until $bp_location19" \
"factorial .value=720.*${srcfile}:$bp_location19.*" \
"until factorial, recursive function"
# Finish out to main scope
#
gdb_test "finish" \
" in main .*$srcfile:$bp_location1.*" \
"finish to main"
# Advance to a function called by main (marker2)
#
gdb_test "advance marker2" \
"marker2 .a=43.*$srcfile1:$bp_location9.*" \
"advance to marker2"
# Now issue an until with another function, not called by the current
# frame, as argument. This should not work, i.e. the program should
# stop at main, the caller, where we put the 'guard' breakpoint.
#
set test_msg "until func, not called by current frame"
gdb_test_multiple "until marker3" "$test_msg" {
-re "main .*at .*${srcfile}:$bp_location20.*$gdb_prompt $" {
pass "$test_msg"
}
-re "main .*at .*${srcfile}:$bp_location21.*$gdb_prompt $" {
pass "$test_msg"
}
}
###
###
###
# Set reverse execution direction
# FIXME: command needs to acknowledge, so we can test if it succeeded.
gdb_test "set exec-dir reverse" "" "set reverse execution"
#
# We should now be at main, after the return from marker2.
# "Advance" backward into marker2.
#
gdb_test "advance marker2" \
"marker2 .a=43.*$srcfile1:$bp_location9.*" \
"reverse-advance to marker2"
# Finish out to main scope (backward)
gdb_test "finish" \
" in main .*$srcfile:$bp_location20.*" \
"reverse-finish from marker2"
# Advance backward to last line of factorial (outer invocation)
gdb_test "advance $bp_location19" \
"factorial .value=720.*${srcfile}:$bp_location19.*" \
"reverse-advance to final return of factorial"
# Now do "until" across the recursive calls,
# ending up in the same frame where we are now.
gdb_test "until $bp_location7" \
"factorial .value=6..*$srcfile:$bp_location7.*" \
"reverse-until to entry of factorial"
# Copyright 2008 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/>.
# Please email any bugs, comments, and/or additions to this file to:
# bug-gdb@prep.ai.mit.edu
# Based on a file written by Fred Fish. (fnf@cygnus.com)
set testfile "watch-reverse"
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}
set wp_set 1
if { [prepare_for_testing watch-reverse.exp $testfile $srcfile] } {
untested watch-reverse.exp
return -1
}
global hex
global decimal
runto main
# FIXME 'record' command should say something so we know it's working.
gdb_test "record" "" "start recording"
# TW: Only software watchpoints can be used in reverse
gdb_test "set can-use-hw-watchpoints 0" "" ""
gdb_test "break marker1" \
"Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
"set breakpoint at marker1"
gdb_test "break marker2" \
"Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
"set breakpoint at marker2"
gdb_continue_to_breakpoint "marker1" ".*/$srcfile:.*"
gdb_test "watch ival3" \
".*\[Ww\]atchpoint $decimal: ival3.*" \
"set watchpoint on ival3"
# Continue until first change, from -1 to 0
gdb_test "continue" \
".*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*" \
"watchpoint hit, first time"
# Continue until the next change, from 0 to 1.
gdb_test "continue" \
".*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" \
"watchpoint hit, second time"
# Continue until the next change, from 1 to 2.
gdb_test "continue" \
".*\[Ww\]atchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*" \
"watchpoint hit, third time"
# Continue until the next change, from 2 to 3.
gdb_test "continue" \
".*\[Ww\]atchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*" \
"watchpoint hit, fourth time"
# Continue until the next change, from 3 to 4.
# Note that this one is outside the loop.
gdb_test "continue" \
".*\[Ww\]atchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*" \
"watchpoint hit, fifth time"
# Continue until we hit the finishing marker function.
# Make sure we hit no more watchpoints.
gdb_continue_to_breakpoint "marker2" ".*/$srcfile:.*"
###
###
###
# FIXME 'set exec-dir' command should give some output so we can test.
gdb_test "set exec-direction reverse" "" "set reverse"
# Reverse until the previous change, from 4 to 3
# Note that this one is outside the loop
gdb_test "continue" \
".*\[Ww\]atchpoint.*ival3.*Old value = 4.*New value = 3.*ival3 = count; ival4 = count;.*" \
"watchpoint hit in reverse, first time"
# Reverse until the previous change, from 3 to 2.
gdb_test "continue" \
".*\[Ww\]atchpoint.*ival3.*Old value = 3.*New value = 2.*ival3 = count; ival4 = count;.*" \
"watchpoint hit in reverse, second time"
# Reverse until the previous change, from 2 to 1.
gdb_test "continue" \
".*\[Ww\]atchpoint.*ival3.*Old value = 2.*New value = 1.*ival3 = count; ival4 = count;.*" \
"watchpoint hit in reverse, third time"
# Reverse until the previous change, from 1 to 0.
gdb_test "continue" \
".*\[Ww\]atchpoint.*ival3.*Old value = 1.*New value = 0.*ival3 = count; ival4 = count;.*" \
"watchpoint hit in reverse, fourth time"
# Reverse until first change, from 0 to -1
gdb_test "continue" \
".*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = -1.*ival3 = count; ival4 = count;.*" \
"watchpoint hit in reverse, fifth time"
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 gdb_prompt
global hex
global decimal
global srcfile
global wp_set
# Disable hardware watchpoints if necessary.
if [target_info exists gdb,no_hardware_watchpoints] {
gdb_test "set can-use-hw-watchpoints 0" "" ""
}
if [gdb_test "break marker1" "Breakpoint 1 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker1" ] {
return 0;
}
if [gdb_test "break marker2" "Breakpoint 2 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker2" ] {
return 0;
}
if [gdb_test "info break" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*" "info break in watchpoint.exp" ] {
return 0;
}
# ??rehrauer: To fix DTS #CHFts23014, in which setting a watchpoint
# before running can cause the inferior to croak on HP-UX 11.0 for
# reasons yet unknown, we've disabled the ability to set watches
# without a running inferior. Verify the restriction.
#
send_gdb "watch ival3\n"
gdb_expect {
-re ".*\[Ww\]atchpoint 3: ival3.*$gdb_prompt $" {
pass "set watchpoint on ival3"
}
-re "warning: can't do that without a running program; try \"break main\", \"run\" first.*$gdb_prompt $" {
pass "set watchpoint on ival3"
set wp_set 0
return 1
}
timeout {
fail "(timeout) set watchpoint on ival3"
return 0
}
}
# "info watch" is the same as "info break"
if [gdb_test "info watch" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n3\[ \]*.*watchpoint.*ival3" "watchpoint found in watchpoint/breakpoint table" ] {
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.
if [gdb_test "disable 3" "disable 3\[\r\n\]+" "disable watchpoint" ] {
return 0;
}
return 1
}
#
# Test simple watchpoint.
#
proc test_simple_watchpoint {} {
global gdb_prompt
global hex
global decimal
global wp_set
# Ensure that the watchpoint is disabled when we startup.
if { $wp_set } {
if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_simple_watchpoint" ] {
return 0;
}
}
# Run until we get to the first marker function.
gdb_run_cmd
set timeout 600
gdb_expect {
-re "Breakpoint 1, marker1 .*$gdb_prompt $" {
pass "run to marker1 in test_simple_watchpoint"
}
-re ".*$gdb_prompt $" {
fail "run to marker1 in test_simple_watchpoint"
return
}
timeout {
fail "run to marker1 in test_simple_watchpoint (timeout)"
return
}
}
if { !$wp_set } {
# ??rehrauer: To fix DTS #CHFts23014, in which setting a watchpoint
# before running can cause the inferior to croak on HP-UX 11.0
# for reasons yet unknown, we've disabled the ability to set
# watches without a running inferior. The following testpoints used
# to be in [initialize].
#
send_gdb "watch ival3\n"
gdb_expect {
-re ".*\[Ww\]atchpoint 3: ival3\r\n$gdb_prompt $" {
pass "set watchpoint on ival3"
}
-re ".*$gdb_prompt $" { fail "set watchpoint on ival3" }
timeout { fail "set watchpoint on ival3 (timeout)" }
}
set wp_set 1
# "info watch" is the same as "info break"
send_gdb "info watch\n"
gdb_expect {
-re "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n3\[ \]*.*watchpoint.*ival3\r\n$gdb_prompt $" {
pass "watchpoint found in watchpoint/breakpoint table"
}
-re ".*$gdb_prompt $" {
fail "watchpoint found in watchpoint/breakpoint table"
}
timeout {
fail "watchpoint found in watchpoint/breakpoint table"
}
}
# 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_gdb "disable 3\n"
gdb_expect {
-re "disable 3\[\r\n\]+$gdb_prompt $" { pass "disable watchpoint" }
-re ".*$gdb_prompt $" { fail "disable watchpoint" }
timeout { fail "disable watchpoint (timeout)" }
}
}
# After reaching the marker function, enable the watchpoint.
if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "enable watchpoint" ] {
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_gdb "cont\n"
gdb_expect {
-re "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*$gdb_prompt $" {
pass "watchpoint hit, first time"
}
-re "Continuing.*Breakpoint.*func1.*$gdb_prompt $" {
setup_xfail "m68*-*-*" 2597
fail "thought it hit breakpoint at func1 twice"
gdb_test "delete \$func1_breakpoint_number" ""
gdb_test "continue" "\
Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count;" \
"watchpoint hit, first time"
}
-re ".*$gdb_prompt $" { fail "watchpoint hit, first time" ; return }
timeout { fail "watchpoint hit, first time (timeout)" ; return }
eof { fail "watchpoint hit, first time (eof)" ; return }
}
# Check that the hit count is reported correctly
gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 1 time.*" "Watchpoint hit count is 1"
gdb_test "delete \$func1_breakpoint_number" ""
# Continue until the next change, from 0 to 1.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit, second time"
# Check that the hit count is reported correctly
gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 2 times.*" "Watchpoint hit count is 2"
# Continue until the next change, from 1 to 2.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*" "watchpoint hit, third time"
# Check that the hit count is reported correctly
gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 3 times.*" "Watchpoint hit count is 3"
# Continue until the next change, from 2 to 3.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*" "watchpoint hit, fourth time"
# Check that the hit count is reported correctly
gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 4 times.*" "Watchpoint hit count is 4"
# Continue until the next change, from 3 to 4.
# Note that this one is outside the loop.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*" "watchpoint hit, fifth time"
# Check that the hit count is reported correctly
gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 5 times.*" "Watchpoint hit count is 5"
# Continue until we hit the finishing marker function.
# Make sure we hit no more watchpoints.
gdb_test "cont" "Continuing.*Breakpoint.*marker2 \(\).*" \
"continue to marker2"
# Disable the watchpoint so we run at full speed until we exit.
if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "watchpoint disabled" ] {
return ;
}
# Run until process exits.
if [target_info exists gdb,noresults] { return }
gdb_continue_to_end "continue to exit in test_simple_watchpoint"
}
# Test disabling watchpoints.
proc test_disabling_watchpoints {} {
global gdb_prompt
global binfile
global srcfile
global decimal
global hex
# "info watch" is the same as "info break"
gdb_test "info watch" "\[0-9\]+\[ \]*breakpoint.*marker1.*\r\n\[0-9\]+\[ \]*breakpoint.*marker2.*\r\n\[0-9]+\[ \]*.*watchpoint.*ival3\r\n\.*\[0-9\]+ times.*" "watchpoints found in watchpoint/breakpoint table"
# Ensure that the watchpoint is disabled when we startup.
if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_disabling_watchpoints" ] {
return 0;
}
# Run until we get to the first marker function.
gdb_run_cmd
set timeout 600
gdb_expect {
-re "Breakpoint 1, marker1 .*$gdb_prompt $" {
pass "run to marker1 in test_disabling_watchpoints"
}
-re ".*$gdb_prompt $" {
fail "run to marker1 in test_disabling_watchpoints"
return
}
timeout {
fail "run to marker1 in test_disabling_watchpoints (timeout)"
return
}
}
# After reaching the marker function, enable the watchpoint.
if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "watchpoint enabled" ] {
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.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, first time"
# Continue until the next change, from 0 to 1.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, second time"
# Disable the watchpoint but leave breakpoints
if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint #2 in test_disabling_watchpoints" ] {
return 0;
}
# Check watchpoint list, looking for the entry that confirms the
# watchpoint is disabled.
gdb_test "info watchpoints" "\[0-9]+\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*" "watchpoint disabled in table"
# Continue until we hit the finishing marker function.
# Make sure we hit no more watchpoints.
gdb_test "cont" "Continuing.*Breakpoint.*marker2 \\(\\).*" \
"disabled watchpoint skipped"
if [target_info exists gdb,noresults] { return }
gdb_continue_to_end "continue to exit in test_disabling_watchpoints"
}
# Test stepping and other mundane operations with watchpoints enabled
proc test_stepping {} {
global gdb_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" " = .*"
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_gdb "finish\n"
gdb_expect {
-re "Run.*exit from.*marker1.* at" {
pass "finish from marker1"
}
default { fail "finish from marker1 (timeout)" ; return }
}
gdb_expect {
-re "marker1 \\(\\);.*$gdb_prompt $" {
send_gdb "step\n"
exp_continue
}
-re "func1 \\(\\);.*$gdb_prompt $" {
pass "back at main from marker1"
}
-re ".*$gdb_prompt $" {
fail "back at main from marker1"
}
default { fail "back at main from marker1 (timeout)" ; return }
}
gdb_test "next" "for \\(count = 0.*" "next to `for' in watchpoint.exp"
# Now test that "until" works. It's a bit tricky to test
# "until", because compilers don't always arrange the code
# exactly the same way, and we might get slightly different
# sequences of statements. But the following should be true
# (if not it is a compiler or a debugger bug): The user who
# does "until" at every statement of a loop should end up
# stepping through the loop once, and the debugger should not
# stop for any of the remaining iterations.
gdb_test "until" "ival1 = count.*" "until to ival1 assignment"
gdb_test "until" "ival3 = count.*" "until to ival3 assignment"
send_gdb "until\n"
gdb_expect {
-re "(for \\(count = 0|\}).*$gdb_prompt $" {
gdb_test "until" "ival1 = count; /. Outside loop ./" \
"until out of loop"
}
-re "ival1 = count; /. Outside loop ./.*$gdb_prompt $" {
pass "until out of loop"
}
-re ".*$gdb_prompt $" {
fail "until out of loop"
}
default { fail "until out of loop (timeout)" ; return }
}
gdb_test "step" "ival2 = count.*" "step to ival2 assignment"
}
}
# Test stepping and other mundane operations with watchpoints enabled
proc test_watchpoint_triggered_in_syscall {} {
global gdb_prompt
# These tests won't work without printf support.
if [gdb_skip_stdio_test "watchpoints triggered in syscall"] {
return;
}
# 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\\\[0\\\]"
gdb_test "watch buf\[1\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[1\\\]"
gdb_test "watch buf\[2\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[2\\\]"
gdb_test "watch buf\[3\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[3\\\]"
gdb_test "watch buf\[4\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[4\\\]"
gdb_test "break marker4" ".*Breakpoint.*"
gdb_test "set doread = 1" ""
# If we send_gdb "123\n" before gdb has switched the tty, then it goes
# to gdb, not the inferior, and we lose. So that is why we have
# watchpoint.c prompt us, so we can wait for that prompt.
send_gdb "continue\n";
gdb_expect {
-re "Continuing\\.\r\ntype stuff for buf now:" {
pass "continue to read"
}
default {
fail "continue to read";
return ;
}
}
send_gdb "123\n"
gdb_expect {
-re ".*\[Ww\]atchpoint.*buf\\\[0\\\].*Old value = 0.*New value = 49\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*\[Ww\]atchpoint.*buf\\\[1\\\].*Old value = 0.*New value = 50\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*\[Ww\]atchpoint.*buf\\\[2\\\].*Old value = 0.*New value = 51\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*\[Ww\]atchpoint.*buf\\\[3\\\].*Old value = 0.*New value = 10\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*$gdb_prompt $" { pass "sent 123" }
timeout { fail "sent 123 (timeout)" }
}
# Examine the values in buf to see how many watchpoints we
# should have printed.
send_gdb "print buf\[0\]\n"
gdb_expect {
-re ".*= 49.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[0\]"}
-re ".*= 0.*$gdb_prompt $" { pass "print buf\[0\]"}
-re ".*$gdb_prompt $" { fail "print buf\[0\]"}
default { fail "print buf\[0\]"}
}
send_gdb "print buf\[1\]\n"
gdb_expect {
-re ".*= 50.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[1\]"}
-re ".*= 0.*$gdb_prompt $" { pass "print buf\[1\]"}
-re ".*$gdb_prompt $" { fail "print buf\[1\]"}
default { fail "print buf\[1\]"}
}
send_gdb "print buf\[2\]\n"
gdb_expect {
-re ".*= 51.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[2\]"}
-re ".*= 0.*$gdb_prompt $" { pass "print buf\[2\]"}
-re ".*$gdb_prompt $" { fail "print buf\[2\]"}
default { fail "print buf\[2\]"}
}
send_gdb "print buf\[3\]\n"
gdb_expect {
-re ".*= 10.*$gdb_prompt $" { set y [expr $y+1]; pass "print buf\[3\]"}
-re ".*= 0.*$gdb_prompt $" { pass "print buf\[3\]"}
-re ".*$gdb_prompt $" { fail "print buf\[3\]" }
default { fail "print buf\[3\]" }
}
# 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.
gdb_test "cont" "Continuing.*Breakpoint.*marker4 \\(\\).*" \
"continue to marker4"
# Disable everything so we can finish the program at full speed
gdb_test "disable" "" "disable in test_watchpoint_triggered_in_syscall"
if [target_info exists gdb,noresults] { return }
gdb_continue_to_end "continue to exit in test_watchpoint_triggered_in_syscall"
}
}
# 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 gdb_prompt
if [runto marker4] then {
gdb_test "watch ptr1->val" ".*\[Ww\]atchpoint \[0-9\]*: ptr1->val"
gdb_test "break marker5" ".*Breakpoint.*"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ptr1->val.*Old value = 1.*New value = 2.*" "Test complex watchpoint"
# Continue until we hit the marker5 function.
# Make sure we hit no more watchpoints.
gdb_test "cont" "Continuing.*Breakpoint.*marker5 \\(\\).*" \
"did not trigger wrong watchpoint"
# Test watches of things declared locally in a function.
# In particular, test that a watch of stack-based things
# is deleted when the stack-based things go out of scope.
#
gdb_test "disable" "" "disable in test_complex_watchpoint"
gdb_test "break marker6" ".*Breakpoint.*"
gdb_test "cont" "Continuing.*Breakpoint.*marker6 \\(\\).*" \
"continue to marker6"
gdb_test "break func2" ".*Breakpoint.*"
gdb_test "cont" "Continuing.*func2.*"
# Test a watch of a single stack-based variable, whose scope
# is the function we're now in. This should auto-delete when
# execution exits the scope of the watchpoint.
#
gdb_test "watch local_a" ".*\[Ww\]atchpoint \[0-9\]*: local_a" "set local watch"
gdb_test "cont" "\[Ww\]atchpoint.*local_a.*" "trigger local watch"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" "self-delete local watch"
gdb_test "cont" "Continuing.*func2.*"
# We should be in "func2" again now. Test a watch of an
# expression which includes both a stack-based local and
# something whose scope is larger than this invocation
# of "func2". This should also auto-delete.
#
gdb_test "watch local_a + ival5" ".*\[Ww\]atchpoint \[0-9\]*: local_a . ival5" \
"set partially local watch"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
"trigger1 partially local watch"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
"trigger2 partially local watch"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
"self-delete partially local watch"
# We should be in "func2" again now. Test a watch of a
# static (non-stack-based) local. Since this has scope
# across any invocations of "func2", it should not auto-
# delete.
#
gdb_test "cont" "Continuing.*func2.*"
gdb_test "watch static_b" ".*\[Ww\]atchpoint \[0-9\]*: static_b" \
"set static local watch"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: static_b.*" \
"trigger static local watch"
gdb_test "cont" "Continuing.*marker6 \\(\\).*" \
"continue after trigger static local watch"
gdb_test "info break" ".*watchpoint.*static_b.*" \
"static local watch did not self-delete"
# We should be in "recurser" now. Test a watch of a stack-
# based local. Symbols mentioned in a watchpoint are bound
# at watchpoint-creation. Thus, a watch of a stack-based
# local to a recursing function should be bound only to that
# one invocation, and should not trigger for other invocations.
#
gdb_test "tbreak recurser" ".*breakpoint.*"
gdb_test "cont" "Continuing.*recurser.*"
gdb_test "watch local_x" ".*\[Ww\]atchpoint \[0-9\]*: local_x" \
"set local watch in recursive call"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_x.*New value = 2.*" \
"trigger local watch in recursive call"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
"self-delete local watch in recursive call"
# Disable everything so we can finish the program at full speed
gdb_test "disable" "" "disable in test_complex_watchpoint"
if [target_info exists gdb,noresults] { return }
gdb_continue_to_end "continue to exit in test_complex_watchpoint"
}
}
proc test_watchpoint_and_breakpoint {} {
global gdb_prompt
# This is a test for PR gdb/38, which involves setting a
# watchpoint right after you've reached a breakpoint.
if [runto func3] then {
gdb_breakpoint [gdb_get_line_number "second x assignment"]
gdb_continue_to_breakpoint "second x assignment"
gdb_test "watch x" ".*atchpoint \[0-9\]+: x"
gdb_test_multiple "next" "next after watch x" {
-re ".*atchpoint \[0-9\]+: x\r\n\r\nOld value = 0\r\nNew value = 1\r\n.*$gdb_prompt $" {
pass "next after watch x"
}
-re "\[0-9\]+\[\t \]+y = 1;\r\n$gdb_prompt $" {
kfail "gdb/38" "next after watch x"
}
}
}
}
proc test_inaccessible_watchpoint {} {
global gdb_prompt
# This is a test for watchpoints on currently inaccessible (but later
# valid) memory.
if [runto func4] then {
gdb_test "watch *global_ptr" ".*atchpoint \[0-9\]+: \\*global_ptr"
gdb_test "next" ".*global_ptr = buf.*"
gdb_test_multiple "next" "next over ptr init" {
-re ".*atchpoint \[0-9\]+: \\*global_ptr\r\n\r\nOld value = .*\r\nNew value = 3 .*\r\n.*$gdb_prompt $" {
# We can not test for <unknown> here because NULL may be readable.
# This test does rely on *NULL != 3.
pass "next over ptr init"
}
}
gdb_test_multiple "next" "next over buffer set" {
-re ".*atchpoint \[0-9\]+: \\*global_ptr\r\n\r\nOld value = 3 .*\r\nNew value = 7 .*\r\n.*$gdb_prompt $" {
pass "next over buffer set"
}
}
}
}
# Start with a fresh gdb.
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load $binfile
set prev_timeout $timeout
set timeout 600
verbose "Timeout now 600 sec.\n"
if [initialize] then {
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 $binfile
initialize
}
test_disabling_watchpoints
# See above.
if [istarget "mips-idt-*"] then {
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load $binfile
initialize
}
if ![target_info exists gdb,cannot_call_functions] {
test_stepping
# See above.
if [istarget "mips-idt-*"] then {
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load $binfile
initialize
}
}
# Only enabled for some targets merely because it has not been tested
# elsewhere.
# On sparc-sun-sunos4.1.3, GDB was running all the way to the marker4
# breakpoint before stopping for the watchpoint. I don't know why.
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 $binfile
initialize
}
# Only enabled for some targets merely because it has not been tested
# elsewhere.
if {[istarget "hppa*-*-*"] || \
[istarget "sparc*-*-sunos*"] || \
[istarget "m32r-*-*"]} then {
test_complex_watchpoint
}
# Verify that a user can force GDB to use "slow" watchpoints.
# (This proves rather little on kernels that don't support
# fast watchpoints, but still...)
#
if ![runto_main] then { fail "watch tests suppressed" }
send_gdb "set can-use-hw-watchpoints 0\n"
gdb_expect {
-re "$gdb_prompt $"\
{pass "disable fast watches"}
timeout {fail "(timeout) disable fast watches"}
}
send_gdb "show can-use-hw-watchpoints\n"
gdb_expect {
-re "Debugger's willingness to use watchpoint hardware is 0.*$gdb_prompt $"\
{pass "show disable fast watches"}
-re "$gdb_prompt $"\
{fail "show disable fast watches"}
timeout {fail "(timeout) show disable fast watches"}
}
send_gdb "watch ival3 if count > 1\n"
gdb_expect {
-re "Watchpoint \[0-9\]*: ival3.*$gdb_prompt $"\
{pass "set slow conditional watch"}
-re "$gdb_prompt $"\
{fail "set slow conditional watch"}
timeout {fail "(timeout) set slow conditional watch"}
}
send_gdb "continue\n"
gdb_expect {
-re "Watchpoint \[0-9\]*: ival3.*Old value = 1.*New value = 2.*$gdb_prompt $"\
{pass "trigger slow conditional watch"}
-re "$gdb_prompt $"\
{fail "trigger slow conditional watch"}
timeout {fail "(timeout) trigger slow conditional watch"}
}
# We've explicitly disabled hardware watches. Verify that GDB
# refrains from using them.
#
send_gdb "rwatch ival3\n"
gdb_expect {
-re "Expression cannot be implemented with read/access watchpoint..*$gdb_prompt $"\
{pass "rwatch disallowed when can-set-hw-watchpoints cleared"}
-re "$gdb_prompt $"\
{fail "rwatch disallowed when can-set-hw-watchpoints cleared"}
timeout {fail "(timeout) rwatch disallowed when can-use-hw-watchpoints cleared"}
}
# Read- and access watchpoints are unsupported on HP-UX. Verify
# that GDB gracefully responds to requests to create them.
#
if [istarget "hppa*-*-hpux*"] then {
send_gdb "set can-use-hw-watchpoints 1\n"
gdb_expect {
-re "$gdb_prompt $"\
{pass "enable fast watches"}
timeout {fail "(timeout) enable fast watches"}
}
send_gdb "rwatch ival3\n"
gdb_expect {
-re "Target does not have this type of hardware watchpoint support.*$gdb_prompt $"\
{pass "read watches disallowed"}
-re "$gdb_prompt $"\
{fail "read watches disallowed"}
timeout {fail "(timeout) read watches disallowed"}
}
send_gdb "awatch ival3\n"
gdb_expect {
-re "Target does not have this type of hardware watchpoint support.*$gdb_prompt $"\
{pass "access watches disallowed"}
-re "$gdb_prompt $"\
{fail "access watches disallowed"}
timeout {fail "(timeout) access watches disallowed"}
}
}
test_inaccessible_watchpoint
# See above.
if [istarget "mips-idt-*"] then {
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load $binfile
initialize
}
test_watchpoint_and_breakpoint
}
# Restore old timeout
set timeout $prev_timeout
verbose "Timeout now $timeout sec.\n"