linux/tools/perf/util/trace-event-scripting.c
Irina Tirdea 1d037ca164 perf tools: Use __maybe_used for unused variables
perf defines both __used and __unused variables to use for marking
unused variables. The variable __used is defined to
__attribute__((__unused__)), which contradicts the kernel definition to
__attribute__((__used__)) for new gcc versions. On Android, __used is
also defined in system headers and this leads to warnings like: warning:
'__used__' attribute ignored

__unused is not defined in the kernel and is not a standard definition.
If __unused is included everywhere instead of __used, this leads to
conflicts with glibc headers, since glibc has a variables with this name
in its headers.

The best approach is to use __maybe_unused, the definition used in the
kernel for __attribute__((unused)). In this way there is only one
definition in perf sources (instead of 2 definitions that point to the
same thing: __used and __unused) and it works on both Linux and Android.
This patch simply replaces all instances of __used and __unused with
__maybe_unused.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1347315303-29906-7-git-send-email-irina.tirdea@intel.com
[ committer note: fixed up conflict with a116e05 in builtin-sched.c ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2012-09-11 12:19:15 -03:00

172 lines
4.5 KiB
C

/*
* trace-event-scripting. Scripting engine common and initialization code.
*
* Copyright (C) 2009-2010 Tom Zanussi <tzanussi@gmail.com>
*
* 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
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "../perf.h"
#include "util.h"
#include "trace-event.h"
struct scripting_context *scripting_context;
static int stop_script_unsupported(void)
{
return 0;
}
static void process_event_unsupported(union perf_event *event __maybe_unused,
struct perf_sample *sample __maybe_unused,
struct perf_evsel *evsel __maybe_unused,
struct machine *machine __maybe_unused,
struct addr_location *al __maybe_unused)
{
}
static void print_python_unsupported_msg(void)
{
fprintf(stderr, "Python scripting not supported."
" Install libpython and rebuild perf to enable it.\n"
"For example:\n # apt-get install python-dev (ubuntu)"
"\n # yum install python-devel (Fedora)"
"\n etc.\n");
}
static int python_start_script_unsupported(const char *script __maybe_unused,
int argc __maybe_unused,
const char **argv __maybe_unused)
{
print_python_unsupported_msg();
return -1;
}
static int python_generate_script_unsupported(struct pevent *pevent
__maybe_unused,
const char *outfile
__maybe_unused)
{
print_python_unsupported_msg();
return -1;
}
struct scripting_ops python_scripting_unsupported_ops = {
.name = "Python",
.start_script = python_start_script_unsupported,
.stop_script = stop_script_unsupported,
.process_event = process_event_unsupported,
.generate_script = python_generate_script_unsupported,
};
static void register_python_scripting(struct scripting_ops *scripting_ops)
{
int err;
err = script_spec_register("Python", scripting_ops);
if (err)
die("error registering Python script extension");
err = script_spec_register("py", scripting_ops);
if (err)
die("error registering py script extension");
scripting_context = malloc(sizeof(struct scripting_context));
}
#ifdef NO_LIBPYTHON
void setup_python_scripting(void)
{
register_python_scripting(&python_scripting_unsupported_ops);
}
#else
extern struct scripting_ops python_scripting_ops;
void setup_python_scripting(void)
{
register_python_scripting(&python_scripting_ops);
}
#endif
static void print_perl_unsupported_msg(void)
{
fprintf(stderr, "Perl scripting not supported."
" Install libperl and rebuild perf to enable it.\n"
"For example:\n # apt-get install libperl-dev (ubuntu)"
"\n # yum install 'perl(ExtUtils::Embed)' (Fedora)"
"\n etc.\n");
}
static int perl_start_script_unsupported(const char *script __maybe_unused,
int argc __maybe_unused,
const char **argv __maybe_unused)
{
print_perl_unsupported_msg();
return -1;
}
static int perl_generate_script_unsupported(struct pevent *pevent
__maybe_unused,
const char *outfile __maybe_unused)
{
print_perl_unsupported_msg();
return -1;
}
struct scripting_ops perl_scripting_unsupported_ops = {
.name = "Perl",
.start_script = perl_start_script_unsupported,
.stop_script = stop_script_unsupported,
.process_event = process_event_unsupported,
.generate_script = perl_generate_script_unsupported,
};
static void register_perl_scripting(struct scripting_ops *scripting_ops)
{
int err;
err = script_spec_register("Perl", scripting_ops);
if (err)
die("error registering Perl script extension");
err = script_spec_register("pl", scripting_ops);
if (err)
die("error registering pl script extension");
scripting_context = malloc(sizeof(struct scripting_context));
}
#ifdef NO_LIBPERL
void setup_perl_scripting(void)
{
register_perl_scripting(&perl_scripting_unsupported_ops);
}
#else
extern struct scripting_ops perl_scripting_ops;
void setup_perl_scripting(void)
{
register_perl_scripting(&perl_scripting_ops);
}
#endif