Re: [RFA]: test for backtrace failures in macro

[Jeff Johnston <jjohnstn@redhat.com>]

Andrew Cagney wrote:
> Jeff Johnston wrote:
> 
>> The following is a test for the change I recently made to allow macros 
>> to continue operating even after a backtrace failure occurs.
>>
>> Tested on x86-linux with linuxthreads and ia64-linux with nptl threads.
> 
> 
> Can you think of an alternative to "macro" as the prefix?  "macro" can 
> also refer to:
> 
>     #define MACRO
> 
> (If I new of one, I'd suggest it :-)  With a better name, ok.
>

Will rename to threadapply.exp and threadapply.c

-- Jeff J.

> Andrew
> 
>> 2004-11-05  Jeff Johnston  <jjohnstn@redhat.com>
>>
>>         * gdb.threads/macrothreads.exp: New test.
>>         * gdb.threads/macrothreads.c: New file.
>>
>>
>> ------------------------------------------------------------------------
>>
>> Index: gdb.threads/macrothreads.c
>> ===================================================================
>> RCS file: gdb.threads/macrothreads.c
>> diff -N gdb.threads/macrothreads.c
>> --- /dev/null    1 Jan 1970 00:00:00 -0000
>> +++ gdb.threads/macrothreads.c    5 Nov 2004 20:38:14 -0000
>> @@ -0,0 +1,82 @@
>> +/* This testcase is part of GDB, the GNU debugger.
>> +
>> +   Copyright 2002, 2003, 2004 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., 59 Temple Place - Suite 330,
>> +   Boston, MA 02111-1307, USA.  + +   This file is copied from 
>> schedlock.c.  */
>> +
>> +#include <stdio.h>
>> +#include <unistd.h>
>> +#include <stdlib.h>
>> +#include <pthread.h>
>> +
>> +void *thread_function(void *arg); /* Pointer to function executed by 
>> each thread */
>> +
>> +#define NUM 5
>> +
>> +unsigned int args[NUM+1];
>> +
>> +int main() {
>> +    int res;
>> +    int all_started;
>> +    pthread_t threads[NUM];
>> +    void *thread_result;
>> +    long i;
>> +
>> +    for (i = 0; i < NUM; i++)
>> +      {
>> +    args[i] = 1; /* Init value.  */
>> +    res = pthread_create(&threads[i],
>> +                     NULL,
>> +                 thread_function,
>> +                 (void *) i);
>> +      }
>> +
>> +    all_started = 0;
>> +    while (!all_started)
>> +      {
>> +    all_started = 1;
>> +        for (i = 0; i < NUM; i++)
>> +          {
>> +            if (args[i] == 1)
>> +          {
>> +            all_started = 0;
>> +            break;
>> +          }
>> +          }  +      }
>> +   
>> +    args[i] = 1;
>> +    /* Break here */
>> +    thread_function ((void *) i);
>> +
>> +    exit(EXIT_SUCCESS);
>> +}
>> +
>> +void *thread_function(void *arg) {
>> +    int my_number =  (long) arg;
>> +    int *myp = (int *) &args[my_number];
>> +
>> +    /* Don't run forever.  Run just short of it :)  */
>> +    while (*myp > 0)
>> +      {
>> +    (*myp) ++;  /* Loop increment.  */
>> +      }
>> +
>> +    pthread_exit(NULL);
>> +}
>> +
>> Index: gdb.threads/macrothreads.exp
>> ===================================================================
>> RCS file: gdb.threads/macrothreads.exp
>> diff -N gdb.threads/macrothreads.exp
>> --- /dev/null    1 Jan 1970 00:00:00 -0000
>> +++ gdb.threads/macrothreads.exp    5 Nov 2004 20:38:14 -0000
>> @@ -0,0 +1,76 @@
>> +# This testcase is part of GDB, the GNU debugger.
>> +
>> +# Copyright 2004 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., 59 Temple Place - Suite 330, Boston, MA 
>> 02111-1307, USA.  +
>> +# Check that GDB can support multiple watchpoints across threads.
>> +
>> +if $tracelevel {
>> +    strace $tracelevel
>> +}
>> +
>> +set prms_id 0
>> +set bug_id 0
>> +
>> +# This test verifies that a macro using backtrace can be applied to 
>> all threads
>> +# and will continue for each thread even though an error may occur in
>> +# backtracing one of the threads.
>> +if [target_info exists gdb,no_hardware_watchpoints] {
>> +    return 0;
>> +}
>> +
>> +set testfile "macrothreads"
>> +set srcfile ${testfile}.c
>> +set binfile ${objdir}/${subdir}/${testfile}
>> +if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" 
>> "${binfile}" executable [list debug "incdir=${objdir}"]] != "" } {
>> +    return -1
>> +}
>> +
>> +gdb_exit
>> +gdb_start
>> +gdb_reinitialize_dir $srcdir/$subdir
>> +gdb_load ${binfile}
>> +
>> +#
>> +# Run to `main' where we begin our tests.
>> +#
>> +
>> +if ![runto_main] then {
>> +    gdb_suppress_tests
>> +}
>> +
>> +# Break after all threads have been started.
>> +set break_line [gdb_get_line_number "Break here"]
>> +gdb_test "b $break_line" ""
>> +gdb_test "continue"
>> +
>> +gdb_test_multiple "define backthread" "defining macro" {
>> +  -re "Type commands for definition of \"backthread\".\r\nEnd with a 
>> line saying just \"end\".\r\n>$" {
>> +    gdb_test_multiple "bt\np\/x 20\nend\n" "macro details" {
>> +      -re "$gdb_prompt $" {
>> +        pass "macro details"
>> +      }
>> +    }
>> +    pass "defining macro"
>> +  }
>> +}
>> +
>> +# Cause backtraces to fail by setting a limit.  This allows us to
>> +# verify that the macro can get past the backtrace error and perform
>> +# subsequent commands.
>> +gdb_test "set backtrace limit 3" ""
>> +gdb_test "thread apply all backthread" "Thread ..*\\\$1 = 
>> 0x14.*Thread ..*\\\$2 = 0x14.*Thread ..*\\\$3 = 0x14.*Thread ..*\\\$4 
>> = 0x14.*Thread ..*\\\$5 = 0x14.*Thread ..*\\\$. = 0x14"
>> +
> 
> 
>