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# tls.exp -- Expect script to test thread-local storage

# Copyright (C) 1992, 2003, 2007, 2008, 2009, 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 .  */

set testfile tls

set testfile2 tls2

set srcfile ${testfile}.c

set srcfile2 ${testfile2}.c

set binfile ${objdir}/${subdir}/${testfile}

if [istarget "*-*-linux"] then {

    set target_cflags "-D_MIT_POSIX_THREADS"

} else {

    set target_cflags ""

}

if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile} ${srcdir}/${subdir}/${srcfile2}" "${binfile}" executable [list debug "incdir=${objdir}"]] != "" } {

    return -1

}

### Compute the value of the a_thread_local variable.

proc compute_expected_value {value} {

    set expected_value 0

    set i 0

    while { $i <= $value} {

        incr expected_value $i

        incr i

    }

    return $expected_value

}

### Get the value of the variable 'me' for the current thread.

proc get_me_variable {tnum} {

    global expect_out

    global gdb_prompt

    global decimal

    set value_of_me -1

    send_gdb "print me\n"

    gdb_expect {

        -re ".*= ($decimal).*\r\n$gdb_prompt $" {

            set value_of_me $expect_out(1,string)

            pass "$tnum thread print me"

        }

        -re "$gdb_prompt $" {

            fail "$tnum thread print me"

        }

        timeout {

            fail "$tnum thread print me (timeout)"

        }

    }

    return ${value_of_me}

}

### Check the values of the thread local variables in the thread.

### Also check that info address print the right things.

proc check_thread_local {number} {

    set me_variable [get_me_variable $number]

    set expected_value [compute_expected_value ${me_variable}]

    gdb_test "p a_thread_local" \

            "= $expected_value" \

            "${number} thread local storage"

    gdb_test "p another_thread_local" \

            "= $me_variable" \

            "${number} another thread local storage"

    gdb_test "info address a_thread_local" \

            ".*a_thread_local.*a thread-local variable at offset.*" \

            "${number} info address a_thread_local"

    gdb_test "info address another_thread_local" \

            ".*another_thread_local.*a thread-local variable at offset.*" \

            "${number} info address another_thread_local"

}

### Select a particular thread.

proc select_thread {thread} {

    global gdb_prompt

    send_gdb "thread $thread\n"

    gdb_expect {

        -re "\\\[Switching to thread .*\\\].*\r\n$gdb_prompt $" {

            pass "selected thread: $thread"

        }

        -re "$gdb_prompt $" {

            fail "selected thread: $thread"

        }

        timeout {

            fail "selected thread: $thread (timeout)"

        }

    }

}

### Do a backtrace for the current thread, and check that the 'spin' routine

### is in it. This means we have one of the threads we created, rather

### than the main thread. Record the thread in the spin_threads

### array. Also remember the level of the 'spin' routine in the backtrace, for

### later use.

proc check_thread_stack {number spin_threads spin_threads_level} {

    global gdb_prompt

    global expect_out

    global decimal

    global hex

    upvar $spin_threads tarr

    upvar $spin_threads_level tarrl

    select_thread $number

    send_gdb "where\n"

    gdb_expect {

        -re ".*(\[0-9\]+)\[ \t\]+$hex in spin \\(vp=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {

            if {[info exists tarr($number)]} {

                fail "backtrace of thread number $number in spin"

            } else {

                pass "backtrace of thread number $number in spin"

                set level $expect_out(1,string)

                set tarrl($number) $level

                set tarr($number) 1

            }

        }

        -re ".*$gdb_prompt $" {

         set tarr($number) 0

         set tarrl($number) 0

         pass "backtrace of thread number $number not relevant"

        }

        timeout {

            fail "backtrace of thread number $number (timeout)"

        }

    }

}

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

if ![runto_main] then {

   fail "Can't run to main"

   return 0

}

# Set a breakpoint at the "spin" routine to

# test the thread local's value.

#

gdb_test "b [gdb_get_line_number "here we know tls value"]" \

         ".*Breakpoint 2.*tls.*"   "set breakpoint at all threads"

# Set a bp at a point where we know all threads are alive.

#

gdb_test "b [gdb_get_line_number "still alive"]" \

         ".*Breakpoint 3.*tls.*" "set breakpoint at synch point"

# Set a bp at the end to see if all threads are finished.

#

gdb_test "b [gdb_get_line_number "before exit"]" \

         ".*Breakpoint 4.*tls.*" "set breakpoint at exit"

send_gdb "continue\n"

gdb_expect {

    -re ".*Program received signal SIGSEGV.*a_thread_local = 0;.*$gdb_prompt $" {

        # This is the first symptom if the gcc and binutils versions

        # in use support TLS, but the system glibc does not.

        unsupported "continue to first thread: system does not support TLS"

        return -1

    }

    -re ".*Program exited normally.*$gdb_prompt $" {

        fail "continue to first thread: program runaway"

    }

    -re ".*Pass 0 done.*Pass 1 done.*$gdb_prompt $" {

        fail "continue to first thread: program runaway 2"

    }

    -re ".*Breakpoint 2.*tls value.*$gdb_prompt $" {

        pass "continue to first thread: get to thread"

    }

    -re ".*$gdb_prompt $" {

        fail "continue to first thread: no progress?"

    }

    timeout { fail "continue to first thread (timeout)" }

}

gdb_test "info thread" ".*Thread.*spin.*" \

        "at least one th in spin while stopped at first th"

check_thread_local "first"

gdb_test "continue" ".*Breakpoint 2.*tls value.*" "continue to second thread"

gdb_test "info thread" "Thread.*spin.*" \

        "at least one th in spin while stopped at second th"

check_thread_local "second"

gdb_test "continue" ".*Breakpoint 2.*tls value.*" "continue to third thread"

gdb_test "info thread" ".*Thread.*spin.*" \

        "at least one th in spin while stopped at third th"

check_thread_local "third"

gdb_test "continue" ".*Breakpoint 3.*still alive.*" "continue to synch point"

set no_of_threads 0

send_gdb "info thread\n"

gdb_expect {

        -re "^info thread\[ \t\r\n\]+(\[0-9\]+) Thread.*$gdb_prompt $" {

           set no_of_threads $expect_out(1,string)

           pass "get number of threads"

        }

        -re "$gdb_prompt $" {

            fail "get number of threads"

        }

        timeout {

            fail "get number of threads (timeout)"

        }

}

array set spin_threads {}

unset spin_threads

array set spin_threads_level {}

unset spin_threads_level

# For each thread check its backtrace to see if it is stopped at the

# spin routine.

for {set i 1} {$i <= $no_of_threads} {incr i} {

    check_thread_stack $i spin_threads spin_threads_level

}

### Loop through the threads and check the values of the tls variables.

### keep track of how many threads we find in the spin routine.

set thrs_in_spin 0

foreach i [array names spin_threads] {

    if {$spin_threads($i) == 1} {

      incr thrs_in_spin

      select_thread $i

      set level $spin_threads_level($i)

      # We expect to be in sem_wait, but if the thread has not yet

      # been scheduled, we might be in sem_post still.  We could be at

      # any intermediate point in spin, too, but that is much less

      # likely.

      gdb_test "up $level" ".*spin.*sem_(wait|post).*" "thread $i up"

      check_thread_local $i

    }

}

if {$thrs_in_spin == 0} {

  fail "No thread backtrace reported spin (vsyscall kernel problem?)"

}

gdb_test "continue" ".*Breakpoint 4.*before exit.*" "threads exited"

send_gdb "info thread\n"

gdb_expect {

    -re ".* 1 Thread.*2 Thread.*$gdb_prompt $" {

        fail "Too many threads left at end"

    }

    -re ".*\\\* 1 Thread.*main.*$gdb_prompt $" {

        pass "Expect only base thread at end"

    }

    -re ".*No stack.*$gdb_prompt $" {

        fail "runaway at end"

    }

    -re ".*$gdb_prompt $" {

        fail "mess at end"

    }

    timeout { fail "at end (timeout)" }

}

# Start over and do some "info address" stuff

#

runto spin

gdb_test "info address a_global" \

        ".*a_global.*static storage at address.*" "info address a_global"

setup_kfail "gdb/1294" "*-*-*"

gdb_test "info address me" ".*me.*is a variable at offset.*" "info address me"

# Test LOC_UNRESOLVED references resolving for `extern' TLS variables.

gdb_test "p a_thread_local" " = \[0-9\]+"

# Here it could crash with: Cannot access memory at address 0x0

gdb_test "p file2_thread_local" " = \[0-9\]+"

# Depending on the current lookup scope we get LOC_UNRESOLVED or LOC_COMPUTED

# both printing:

# Symbol "file2_thread_local" is a thread-local variable at offset 8 in the thread-local storage for `.../gdb.threads/tls'.

gdb_test "info address file2_thread_local" "Symbol \"file2_thread_local\" is a thread-local variable.*"

# Here it could also crash with: Cannot access memory at address 0x0

gdb_test "p a_thread_local" " = \[0-9\]+" "p a_thread_local second time"

gdb_test "info address a_thread_local" "Symbol \"a_thread_local\" is a thread-local variable.*"

# Done!

#

gdb_exit

return 0