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

[Andrew Cagney <cagney@gnu.org>]

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.

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"
> +