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300 lines
9.0 KiB
Plaintext
300 lines
9.0 KiB
Plaintext
# tls.exp -- Expect script to test thread-local storage
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# Copyright (C) 1992-2015 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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standard_testfile tls.c tls2.c
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if [istarget "*-*-linux"] then {
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set target_cflags "-D_MIT_POSIX_THREADS"
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} else {
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set target_cflags ""
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}
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if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile} ${srcdir}/${subdir}/${srcfile2}" "${binfile}" executable [list c++ debug]] != "" } {
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return -1
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}
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### Compute the value of the a_thread_local variable.
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proc compute_expected_value {value} {
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set expected_value 0
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set i 0
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while { $i <= $value} {
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incr expected_value $i
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incr i
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}
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return $expected_value
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}
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### Get the value of the variable 'me' for the current thread.
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proc get_me_variable {tnum} {
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global expect_out
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global gdb_prompt
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global decimal
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set value_of_me -1
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send_gdb "print me\n"
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gdb_expect {
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-re ".*= ($decimal).*\r\n$gdb_prompt $" {
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set value_of_me $expect_out(1,string)
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pass "$tnum thread print me"
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}
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-re "$gdb_prompt $" {
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fail "$tnum thread print me"
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}
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timeout {
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fail "$tnum thread print me (timeout)"
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}
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}
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return ${value_of_me}
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}
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### Check the values of the thread local variables in the thread.
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### Also check that info address print the right things.
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proc check_thread_local {number} {
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set me_variable [get_me_variable $number]
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set expected_value [compute_expected_value ${me_variable}]
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gdb_test "p a_thread_local" \
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"= $expected_value" \
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"${number} thread local storage"
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gdb_test "p K::another_thread_local" \
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"= $me_variable" \
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"${number} another thread local storage"
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gdb_test "info address a_thread_local" \
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".*a_thread_local.*a thread-local variable at offset.*" \
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"${number} info address a_thread_local"
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gdb_test "info address K::another_thread_local" \
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".*another_thread_local.*a thread-local variable at offset.*" \
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"${number} info address another_thread_local"
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}
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### Select a particular thread.
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proc select_thread {thread} {
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global gdb_prompt
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send_gdb "thread $thread\n"
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gdb_expect {
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-re "\\\[Switching to thread .*\\\].*\r\n$gdb_prompt $" {
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pass "selected thread: $thread"
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}
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-re "$gdb_prompt $" {
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fail "selected thread: $thread"
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}
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timeout {
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fail "selected thread: $thread (timeout)"
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}
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}
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}
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### Do a backtrace for the current thread, and check that the 'spin' routine
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### is in it. This means we have one of the threads we created, rather
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### than the main thread. Record the thread in the spin_threads
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### array. Also remember the level of the 'spin' routine in the backtrace, for
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### later use.
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proc check_thread_stack {number spin_threads spin_threads_level} {
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global gdb_prompt
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global expect_out
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global decimal
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global hex
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upvar $spin_threads tarr
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upvar $spin_threads_level tarrl
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select_thread $number
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send_gdb "where\n"
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gdb_expect {
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-re ".*(\[0-9\]+)\[ \t\]+$hex in spin \\(vp=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {
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if {[info exists tarr($number)]} {
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fail "backtrace of thread number $number in spin"
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} else {
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pass "backtrace of thread number $number in spin"
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set level $expect_out(1,string)
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set tarrl($number) $level
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set tarr($number) 1
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}
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}
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-re ".*$gdb_prompt $" {
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set tarr($number) 0
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set tarrl($number) 0
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pass "backtrace of thread number $number not relevant"
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}
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timeout {
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fail "backtrace of thread number $number (timeout)"
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}
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}
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}
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clean_restart ${binfile}
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if ![runto_main] then {
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fail "Can't run to main"
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return 0
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}
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# Set a breakpoint at the "spin" routine to
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# test the thread local's value.
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#
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gdb_test "b [gdb_get_line_number "here we know tls value"]" \
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".*Breakpoint 2.*tls.*" "set breakpoint at all threads"
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# Set a bp at a point where we know all threads are alive.
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#
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gdb_test "b [gdb_get_line_number "still alive"]" \
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".*Breakpoint 3.*tls.*" "set breakpoint at synch point"
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# Set a bp at the end to see if all threads are finished.
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#
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gdb_test "b [gdb_get_line_number "before exit"]" \
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".*Breakpoint 4.*tls.*" "set breakpoint at exit"
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send_gdb "continue\n"
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gdb_expect {
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-re ".*Program received signal SIGSEGV.*a_thread_local = 0;.*$gdb_prompt $" {
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# This is the first symptom if the gcc and binutils versions
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# in use support TLS, but the system glibc does not.
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unsupported "continue to first thread: system does not support TLS"
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return -1
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}
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-re ".*$inferior_exited_re normally.*$gdb_prompt $" {
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fail "continue to first thread: program runaway"
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}
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-re ".*Pass 0 done.*Pass 1 done.*$gdb_prompt $" {
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fail "continue to first thread: program runaway 2"
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}
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-re ".*Breakpoint 2.*tls value.*$gdb_prompt $" {
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pass "continue to first thread: get to thread"
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}
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-re ".*$gdb_prompt $" {
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fail "continue to first thread: no progress?"
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}
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timeout { fail "continue to first thread (timeout)" }
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}
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gdb_test "info thread" ".*Thread.*spin.*" \
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"at least one th in spin while stopped at first th"
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check_thread_local "first"
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gdb_test "continue" ".*Breakpoint 2.*tls value.*" "continue to second thread"
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gdb_test "info thread" "Thread.*spin.*" \
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"at least one th in spin while stopped at second th"
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check_thread_local "second"
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gdb_test "continue" ".*Breakpoint 2.*tls value.*" "continue to third thread"
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gdb_test "info thread" ".*Thread.*spin.*" \
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"at least one th in spin while stopped at third th"
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check_thread_local "third"
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gdb_test "continue" ".*Breakpoint 3.*still alive.*" "continue to synch point"
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set no_of_threads 0
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send_gdb "info thread\n"
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gdb_expect {
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-re "^info thread\[ \t\r\n\]+ *Id .*Frame\[ \t\r\n\]+(\[0-9\]+) *Thread.*$gdb_prompt $" {
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set no_of_threads $expect_out(1,string)
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pass "get number of threads"
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}
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-re "$gdb_prompt $" {
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fail "get number of threads"
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}
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timeout {
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fail "get number of threads (timeout)"
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}
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}
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array set spin_threads {}
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unset spin_threads
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array set spin_threads_level {}
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unset spin_threads_level
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# For each thread check its backtrace to see if it is stopped at the
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# spin routine.
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for {set i 1} {$i <= $no_of_threads} {incr i} {
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check_thread_stack $i spin_threads spin_threads_level
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}
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### Loop through the threads and check the values of the tls variables.
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### keep track of how many threads we find in the spin routine.
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set thrs_in_spin 0
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foreach i [array names spin_threads] {
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if {$spin_threads($i) == 1} {
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incr thrs_in_spin
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select_thread $i
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set level $spin_threads_level($i)
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# We expect to be in sem_wait, but if the thread has not yet
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# been scheduled, we might be in sem_post still. We could be at
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# any intermediate point in spin, too, but that is much less
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# likely.
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gdb_test "up $level" ".*spin.*sem_(wait|post).*" "thread $i up"
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check_thread_local $i
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}
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}
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if {$thrs_in_spin == 0} {
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fail "No thread backtrace reported spin (vsyscall kernel problem?)"
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}
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gdb_test "continue" ".*Breakpoint 4.*before exit.*" "threads exited"
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send_gdb "info thread\n"
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gdb_expect {
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-re ".* 1 *Thread.*2 *Thread.*$gdb_prompt $" {
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fail "Too many threads left at end"
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}
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-re ".*\\\* 1 *Thread.*main.*$gdb_prompt $" {
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pass "Expect only base thread at end"
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}
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-re ".*No stack.*$gdb_prompt $" {
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fail "runaway at end"
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}
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-re ".*$gdb_prompt $" {
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fail "mess at end"
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}
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timeout { fail "at end (timeout)" }
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}
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# Start over and do some "info address" stuff
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#
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runto spin
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gdb_test "info address a_global" \
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".*a_global.*static storage at address.*" "info address a_global"
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gdb_test "info address me" ".*me.*is a (complex DWARF expression:|variable).*" \
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"info address me"
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# Test LOC_UNRESOLVED references resolving for `extern' TLS variables.
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gdb_test "p a_thread_local" " = \[0-9\]+"
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# Here it could crash with: Cannot access memory at address 0x0
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gdb_test "p file2_thread_local" " = \[0-9\]+"
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# Depending on the current lookup scope we get LOC_UNRESOLVED or LOC_COMPUTED
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# both printing:
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# Symbol "file2_thread_local" is a thread-local variable at offset 8 in the thread-local storage for `.../gdb.threads/tls'.
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gdb_test "info address file2_thread_local" "Symbol \"file2_thread_local\" is a thread-local variable.*"
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# Here it could also crash with: Cannot access memory at address 0x0
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gdb_test "p a_thread_local" " = \[0-9\]+" "p a_thread_local second time"
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gdb_test "info address a_thread_local" "Symbol \"a_thread_local\" is a thread-local variable.*"
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# Done!
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#
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gdb_exit
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return 0
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